US20080232984A1 - Reciprocating Compressor Having Supporting Unit Attentuating Lateral Displacement Thereof - Google Patents
Reciprocating Compressor Having Supporting Unit Attentuating Lateral Displacement Thereof Download PDFInfo
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- US20080232984A1 US20080232984A1 US10/572,954 US57295404A US2008232984A1 US 20080232984 A1 US20080232984 A1 US 20080232984A1 US 57295404 A US57295404 A US 57295404A US 2008232984 A1 US2008232984 A1 US 2008232984A1
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- compressor
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- elastic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/121—Casings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0027—Pulsation and noise damping means
- F04B39/0044—Pulsation and noise damping means with vibration damping supports
Definitions
- the present invention relates to a reciprocating compressor having a supporting unit attenuating its lateral displacement, and more particularly, to a reciprocating compressing having a supporting unit attenuating its lateral displacement capable of minimizing lateral vibration of a compressor, which is generated in a direction that a reciprocating motor is operated in operation of the reciprocating compressor.
- a reciprocating compressor constitutes an air conditioning device, sucks a refrigerant gas thereinto and discharges the compressed refrigerant gas outside the compressor as a piston linearly reciprocates in a cylinder.
- a conventional reciprocating compressor includes a casing 10 forming an exterior, having a certain space therein and including a suction pipe (SP) through which a refrigerant gas is introduced and a discharge pipe (DP) through which the refrigerant gas compressed in the compressor is discharged outside; a compressor main body 70 positioned in the casing 10 , for compressing the sucked refrigerant gas; and a supporting unit 60 having a plurality of coil springs elastically connecting the compressor main body 70 to one surface of the casing 10 so that the main body 70 is fixed to the casing 10 .
- SP suction pipe
- DP discharge pipe
- the main body 70 of the compressor includes a frame unit 20 elastically connected to the supporting unit 60 and forming the whole frame of the main body 70 ; a reciprocating motor 30 fixedly installed at the frame unit 20 and generating a linear reciprocating driving force; and a compressing unit 40 supported at the frame unit 20 and compressing the sucked refrigerant gas by a driving force of the reciprocating motor 30 .
- the frame unit 20 includes a front frame 21 having one surface supported by the supporting unit 60 and fixing one surface of the reciprocating motor 30 ; a middle frame 22 fixed at the other surface of the reciprocating motor 30 fixed at the front frame 21 ; and a rear frame 23 having one surface elastically fixed by the supporting unit 60 and connected to the middle frame 22 .
- the reciprocating motor 30 includes an outer stator 31 fixedly installed between the front frame 21 and the middle frame 22 and having a winding coil 34 therein; an inner stator 32 facing the outer stator 31 at a certain interval and fixedly installed at one side of the front frame 21 ; and a rotor 33 linearly moving between the outer stator 31 and the inner stator 32 .
- the compressing unit 40 includes a cylinder 41 inserted into the front frame 21 to be fixed thereto; a piston 42 having a path (F) for a refrigerant gas therein and having one end connected to the rotor 33 to thereby reciprocate in the cylinder 41 ; a suction valve 43 installed at a front end surface of the piston 42 , for opening and closing the refrigerant gas path (F); and a discharge valve assembly 44 installed at one end surface of the cylinder 41 , for controlling discharge of the compressed refrigerant gas.
- a compressing space (P) is formed between the suction valve 43 and the discharge valve assembly 44 .
- a front resonant spring 51 and a rear resonant spring 52 causing a resonant motion of the piston 42 are installed between one end of the piston 42 connected to the rotor 33 and one end of the front frame 21 and between the one end of the piston 42 and one end of the rear frame 23 , respectively.
- a plurality of coil springs constituting the supporting unit 60 includes a front coil spring 61 connecting the front frame 21 to one surface of the casing 10 ; and a rear coil spring 62 connecting the rear frame 23 to one surface of the casing 10 , so that the main body 70 is elastically fixed to the inside of the casing 10 .
- the plurality of oil springs 61 and 62 are formed by being spirally wound several times at regular intervals, having the same diameter. That is, the coil spring 61 , 62 has an inner coil 58 wound plural times and end coils 59 formed at both ends of the inner coil 58 .
- the inner coil 58 is wound at regular pitches (t), and each of the end oils 59 is tightly wound so that the coil spring 61 , 62 can be fixed to one surface of the compressor main body 70 —the front frame 21 and the rear frame 23 —and one surface of the casing 10
- the conventional reciprocating compressor as described above is operated as follows.
- a rotor 33 and a piston 42 are moved together in a direction of the electromagnetic force, and, simultaneously, the piston 42 generates a pressure difference in a compressing space (P) of the cylinder 41 while linearly reciprocating in the cylinder by front and rear resonant springs 51 and 52 , thereby repeatedly performing a series of processes of sucking a refrigerant gas and compressing the sucked refrigerant gas until the pressure reaches a certain level and discharging the compressed refrigerant gas.
- P compressing space
- the conventional reciprocating compressor as above is mostly vibrated in a lateral direction by nature, that is, in a direction that the piston of the reciprocating motor moves. Nevertheless, the lateral stiffness of the oil spring is weak because an internal oil of each coil spring for supporting the main body of the reciprocating compressor is formed at regular pitches. For this reason, as shown in FIG. 2B , a lateral displacement (L) of the compressor becomes great, and thus the compressor main body is excessively inclined, thereby making the vibration of the compressor severe.
- a reciprocating compressor having a supporting unit attenuating a lateral displacement capable of minimizing lateral vibration of a compressor, which is generated in a direction that a reciprocating motor is operated when the reciprocating compressor is in operation.
- a reciprocating compressor comprising: a casing including a suction pipe through which a fluid is introduced from the outside and a discharge pipe through which the fluid is discharged outside and forming a predetermined internal space; a compressor main body positioned in the casing, compressing the fluid introduced through the suction pipe by a linear reciprocating motion of a piston and discharging the compressed fluid through the discharge pipe; and a supporting unit including a plurality of coil springs connecting the compressor main body to the casing, wherein the plurality of coil springs include, respectively, end coils tightly wound to be fixed to one surface of the compressor main body and to one surface of the casing; and an inner coil positioned between the pair of the end oils and having at least one part wound tightly.
- FIG. 1 is a longitudinal sectional view of a conventional reciprocating compressor
- FIG. 2A is a side view showing a oil spring of a conventional reciprocating compressor
- FIG. 3A is a view showing a lateral displacement of a oil spring of a conventional reciprocating compressor
- FIG. 3 is a longitudinal sectional view showing one example of a reciprocating compressor in accordance with the present invention.
- FIG. 4 is a partial longitudinal sectional view of a reciprocating compressor, for showing a coil spring in accordance with a first embodiment of the present invention
- FIG. 5A is a side view showing a oil spring in accordance with a first embodiment of the present invention.
- FIG. 5B is a view showing a lateral displacement of a coil spring in accordance with a first embodiment of the present invention
- FIG. 6 is a partial longitudinal sectional view of a reciprocating compressor, for showing a coil spring in accordance with a second embodiment of the present invention
- FIG. 7A is a side view showing a oil spring in accordance with a second embodiment of the present invention.
- FIG. 7B is a view showing a lateral displacement of a coil spring in accordance with a second embodiment of the present invention.
- FIG. 8 is a partial longitudinal sectional view of a reciprocating compressor, for showing a coil spring in accordance with a third embodiment of the present invention.
- FIG. 9A is a side view showing a oil spring in accordance with a third embodiment of the present invention.
- FIG. 9B is a view showing a lateral displacement of a coil spring in accordance with a third embodiment of the present invention.
- FIG. 3 is a longitudinal sectional view showing a reciprocating compressor in accordance with the present invention.
- the reciprocating compressor in accordance with the present invention includes: a casing 100 forming an exterior of a compressor, having a certain space therein and including a suction pipe (SP) through which a refrigerant gas is introduced and a discharge pipe through which the refrigerant gas compressed in the compressor is discharged outside; a compressor main body 700 positioned in the casing 100 , for compressing and discharging the sucked refrigerant gas; and a supporting unit 600 including a plurality of oil springs elastically connecting the compressor main body 700 to one surface of the casing 100 so that the main body 700 is fixed to the casing 100 .
- SP suction pipe
- the compressor main body 700 includes a frame unit 200 elastically connected to the supporting unit 600 and forming the whole frame of the main body 700 ; a reciprocating motor 300 fixedly installed at the frame unit 200 , for generating a linear reciprocating driving force; and a compressing unit 400 supported by the frame unit 200 , for compressing the sucked refrigerant gas by a driving force of the reciprocating motor 300 .
- the frame unit 200 includes a front frame 210 having one surface supported by the supporting unit 600 and fixing one surface of the reciprocating motor 300 ; a middle frame 220 fixed to the other surface of the reciprocating motor 300 fixed at the front frame 210 ; and a rear frame 230 having one surface elastically fixed to the supporting unit 500 and connected to the middle frame 220 .
- the reciprocating motor 300 includes an outer stator 310 fixedly installed between the front frame 210 and the middle frame 220 and having a winding oil 340 therein; an inner stator 320 facing the outer stator 310 at a certain interval and fixedly installed at one side of the front frame 210 ; and a rotor 330 linearly moving between the outer stator 310 and the inner stator 320 .
- the compressing unit 400 includes a cylinder 410 inserted into the front frame 210 to be fixed thereto; a piston 420 having a path (F) for a refrigerant gas therein and having one end connected to the rotor 330 to thereby reciprocate in the cylinder 410 ; a suction valve 430 installed at a front end surface of the piston 420 , for opening and closing the refrigerant gas path (F); and a discharge valve assembly 440 installed at one end surface of the cylinder 410 , for controlling discharge of the compressor refrigerant gas. Accordingly, a compressing space (P) is formed between the suction valve 430 and the discharge valve assembly 440 .
- a front resonant spring 510 and a rear resonant spring 502 causing a resonant motion of the piston 420 are installed between one end of the piston 420 connected to the rotor 330 and one end of the front frame 210 and between the one end of the piston 420 and one end of the rear frame 230 , respectively.
- a plurality of coil springs constituting the supporting unit 600 include, respectively, a front coil spring 610 connecting the front frame 210 to one surface of the casing 100 ; and a rear coil spring 620 connecting the rear frame 230 to one surface of the casing 100 so that the main body 700 is elastically fixed to the inside of the casing 100 .
- the plurality of oil springs 610 and 620 are formed by being spirally wound several times, having the same diameter. That is, the oil spring 610 , 620 has an inner coil 580 wound plural times and end coils 590 formed at both ends of the inner coil 580 .
- the inner oil 580 has at least one part which is tightly wound so as to reduce vibration of the compressor main body 700 , which is generated in a direction that the piston 420 moves. And, the end coil 590 is tightly wound so that the coil spring 610 , 620 can be fixed to one surface of the compressor main body 700 —the front frame 210 and the rear frame 230 —and to one surface of the casing 100 .
- FIG. 4 shows one of plural coil springs constituting a supporting unit of a reciprocating compressor in accordance with a first embodiment of the present invention.
- FIG. 4 Even though only one front oil spring is depicted in FIG. 4 , the same structure as that depicted in the drawing is applied to the rest of the coil spring of the reciprocating compressor. A structure depicted in another drawing for another embodiment to be described later is also applied to the rest of the coil spring of the corresponding compressor.
- the coil spring 610 , 620 in accordance with the first embodiment of the present invention includes end coils 590 tightly wound so as to be respectively fixed to one surface of the casing 100 and one surface of the main body, particularly, one surface of the frame unit 200 ; and an inner coil 580 wound and connected to the end coil 590 .
- the inner coil 580 includes a pair of elastic parts 631 having predetermined pitches (t) from the end coil 590 toward the central portion of the coil spring; and a mass part 632 formed at the central portion of the coil spring between the pair of elastic parts 631 and tightly wound without any interval.
- the winding number of the mass part 632 is twice ⁇ four times as many as that of the end coil 590 so that the coil spring 610 , 620 has a stiffness which can stand lateral vibration of a reciprocating motor 300 and a compressing unit 400 .
- the pair of elastic parts 631 is wound having regular pitches.
- each of the elastic parts 631 may be wound at pitches (T) decreased as it goes from the end coil 590 toward the mass part 632 or may be wound at pitches (T) increased as it goes from the end coil 590 toward the mass part 632 .
- each of elastic parts 631 may be wound at pitches increased and decreased alternately between the end part 590 and the mass part 632 .
- the oil spring has longitudinal stiffness and simultaneously lateral stiffness by including the pair of elastic parts 631 and the mass part 632 between the pair of elastic parts 631 .
- FIGS. 6 and 7 show a coil spring constituting a supporting unit of a reciprocating compressor in accordance with a second embodiment of the present invention.
- a coil spring 610 , 620 in accordance with the second embodiment includes an end coil 590 ; and an inner oil 580 including a pair of mass parts 641 which are tightly wound right next to the end coil 590 ; an elastic part 642 wound at predetermined pitches (t) between the pair mass parts.
- the winding number of the mass part 641 preferably is two ⁇ four times as many as that of the end coil 590 .
- the elastic part 642 is preferably wound at regular pitches (t).
- the elastic part 642 may be wound at pitches decreased as it goes toward the central portion of the coil spring 610 , 620 or, contrary, at pitches (T) increased as it goes toward its central portion.
- the elastic part 642 may be wound at pitches increased and decreased alternately between the pair of the mass parts 641 .
- the lateral stiffness of the coil spring 610 , 620 is increased by the mass parts 641 which are tightly wound, thereby effectively attenuating a lateral displacement (L 2 ) generated by the vibration of the compressor main body 700 .
- FIG. 8 shows a coil spring constituting a supporting unit of a reciprocating compressor in accordance with a third embodiment of the present invention.
- a oil spring 610 , 620 in accordance with the third embodiment includes an end oil 592 ; and an inner coil including a first elastic part 652 wound from an end coil 590 fixed at one surface of the compressor main body 700 at predetermined pitches (t 1 ), a second elastic part 653 wound from an end coil 590 fixed at one surface of the casing 100 at predetermined pitches (t 2 ) that are different from those (t 1 ) of the first elastic part 652 , and a mass part 651 tightly wound between the first and second elastic parts 652 and 653 .
- the pitches (t 1 ) of the first elastic part 652 and the pitches (t 2 ) of the second elastic part are regular, respectively, but the two pitches (t 1 and t 2 ) are different from each other.
- first elastic part 652 and the second elastic part 653 may be wound at pitches (t 1 , t 2 ) decreased as it goes from both end coils 592 and the mass part 651 , and the decreasing ratios of the pitch (t 1 ) and the pitch (t 2 ) may be different from each other.
- first elastic part 652 and the second elastic part 653 may be wound at pitches (t 1 and t 2 ) increased as it goes from both end coils 592 toward the mass part 651 , and the increasing ratios of the pitch (t 1 ) and the pitch (t 2 ) may be different from each other.
- first elastic part and the second elastic part 653 may be wound at pitches (t 1 and t 2 ) increased and decreased alternatively as it goes from both end coils 592 toward the mass part 651 , and the increasing ratios of the pitch (t 1 ) and the pitch (t 2 ) may be different from each other.
- one of the first and second elastic parts 652 and 653 is wound at regular pitches, but the other elastic part may be wound at pitches increased as it goes toward the mass part 651 .
- one of the first and second elastic parts 652 and 653 is wound at regular pitches, but the other elastic part may be wound at pitches decreased as it goes toward the mass part 651 .
- one of the first and second elastic parts 652 and 653 is wound at regular pitches, but the other elastic part may be wound at pitches increased and decreased alternately as it goes toward the mass part 651 .
- the lateral stiffness of the coil spring 610 , 620 is increased by the mass part which is tightly wound.
- elastic coefficients of the first elastic part 652 and the second elastic part 653 are different from each other, a lateral displacement generated by the vibration of the compressor main body 700 can be attenuated, more effectively.
- the compressor main body may be supported at the casing by properly disposing coil springs constituting a supporting unit of the reciprocating compressor in accordance with each embodiment of the present invention.
- the reciprocating compressor in accordance with the present invention is operated as follows.
- a rotor 330 and a piston 420 are moved together in a direction of the electromagnetic force, and simultaneously, the piston 420 linearly reciprocates in a cylinder by front and rear resonant springs 510 , 520 , thereby generating a pressure difference in a compressing space of the cylinder 410 .
- a series of processes of sucking a refrigerant gas into the compressing space (P) and compressing the sucked refrigerant gas until the pressure reaches a certain level and then discharging the compressed refrigerant gas is repeatedly performed.
- the coil spring 610 , 620 for supporting the compressor main body 700 includes a mass part functioning as a kind of mass body by being tightly wound.
- an elastic part having predetermined pitches is formed near the mass part. Accordingly, the coil spring provides not only an elastic force which is a fundamental property as a coil spring but also high lateral stiffness, thereby attenuating a lateral displacement of the compressor main body and thus effectively reducing the vibration of the compressor.
- a reciprocating compressor having a supporting unit attenuating a lateral displacement can minimize lateral vibration of the compressor, which is generated in a direction that a reciprocating motor is operated when the reciprocating compressor is in operation.
Abstract
A reciprocating compressor comprises a casing including a suction pipe (SP) through which a fluid is introduced from the outside and a discharge pipe (DP) through which the fluid is discharged outside and forming a predetermined internal space; a compressor main body (700) positioned in the casing (100), compressing the fluid introduced through the suction pipe (SP) with a linear reciprocating motion of a piston (420) and discharging the compressed fluid through the discharge pipe (DP); and a supporting unit (600) including a plurality of coil springs connecting the compressor main body (700) to the casing (100), wherein the plurality of coil springs (610, 620) includes, respectively, end coils (590) tightly wound so as to be fixed to one surface of the compressor main body (700) and to one surface of the casing (100) and an inner coil (580) having at least one part which is tightly wound and positioned between the end coils (590), thereby minimizing the lateral vibration of the compressor, which is generated in a direction that a reciprocating motor is operated in operation of the reciprocating compressor.
Description
- The present invention relates to a reciprocating compressor having a supporting unit attenuating its lateral displacement, and more particularly, to a reciprocating compressing having a supporting unit attenuating its lateral displacement capable of minimizing lateral vibration of a compressor, which is generated in a direction that a reciprocating motor is operated in operation of the reciprocating compressor.
- In general, a reciprocating compressor constitutes an air conditioning device, sucks a refrigerant gas thereinto and discharges the compressed refrigerant gas outside the compressor as a piston linearly reciprocates in a cylinder.
- As shown in
FIG. 1 , a conventional reciprocating compressor includes acasing 10 forming an exterior, having a certain space therein and including a suction pipe (SP) through which a refrigerant gas is introduced and a discharge pipe (DP) through which the refrigerant gas compressed in the compressor is discharged outside; a compressormain body 70 positioned in thecasing 10, for compressing the sucked refrigerant gas; and a supportingunit 60 having a plurality of coil springs elastically connecting the compressormain body 70 to one surface of thecasing 10 so that themain body 70 is fixed to thecasing 10. - The
main body 70 of the compressor includes aframe unit 20 elastically connected to the supportingunit 60 and forming the whole frame of themain body 70; a reciprocatingmotor 30 fixedly installed at theframe unit 20 and generating a linear reciprocating driving force; and acompressing unit 40 supported at theframe unit 20 and compressing the sucked refrigerant gas by a driving force of the reciprocatingmotor 30. - The
frame unit 20 includes afront frame 21 having one surface supported by the supportingunit 60 and fixing one surface of the reciprocatingmotor 30; amiddle frame 22 fixed at the other surface of the reciprocatingmotor 30 fixed at thefront frame 21; and arear frame 23 having one surface elastically fixed by the supportingunit 60 and connected to themiddle frame 22. - The
reciprocating motor 30 includes anouter stator 31 fixedly installed between thefront frame 21 and themiddle frame 22 and having awinding coil 34 therein; aninner stator 32 facing theouter stator 31 at a certain interval and fixedly installed at one side of thefront frame 21; and arotor 33 linearly moving between theouter stator 31 and theinner stator 32. - The
compressing unit 40 includes acylinder 41 inserted into thefront frame 21 to be fixed thereto; apiston 42 having a path (F) for a refrigerant gas therein and having one end connected to therotor 33 to thereby reciprocate in thecylinder 41; asuction valve 43 installed at a front end surface of thepiston 42, for opening and closing the refrigerant gas path (F); and adischarge valve assembly 44 installed at one end surface of thecylinder 41, for controlling discharge of the compressed refrigerant gas. A compressing space (P) is formed between thesuction valve 43 and thedischarge valve assembly 44. - Here, a front
resonant spring 51 and a rearresonant spring 52 causing a resonant motion of thepiston 42 are installed between one end of thepiston 42 connected to therotor 33 and one end of thefront frame 21 and between the one end of thepiston 42 and one end of therear frame 23, respectively. - A plurality of coil springs constituting the supporting
unit 60 includes afront coil spring 61 connecting thefront frame 21 to one surface of thecasing 10; and arear coil spring 62 connecting therear frame 23 to one surface of thecasing 10, so that themain body 70 is elastically fixed to the inside of thecasing 10. - As shown in
FIGS. 1 and 2A , the plurality ofoil springs coil spring inner coil 58 wound plural times andend coils 59 formed at both ends of theinner coil 58. - The
inner coil 58 is wound at regular pitches (t), and each of theend oils 59 is tightly wound so that thecoil spring main body 70—thefront frame 21 and therear frame 23—and one surface of thecasing 10 - The conventional reciprocating compressor as described above is operated as follows.
- When a current is applied to a
winding coil 34 of anouter stator 31 of areciprocating motor 30, an induction magnetic field having a direction changed according to a direction of a current is formed at theouter stator 31, and an electromagnetic force having a direction changed according to a direction of the induction magnetic field is generated between theouter stator 31 and theinner stator 32 by the interaction between the induction magnetic field and a magnetic filed of theinner stator 32. Here, arotor 33 and apiston 42 are moved together in a direction of the electromagnetic force, and, simultaneously, thepiston 42 generates a pressure difference in a compressing space (P) of thecylinder 41 while linearly reciprocating in the cylinder by front and rearresonant springs - When the compressor passes through the processes of sucking and discharging a refrigerant gas by an operation of the reciprocating motor, vibration is generated at the main body. Such vibration of the compressor main body is reduced by a supporting unit including a plurality of coil springs having regular pitches, and thus noise and vibration transmitted to the casing of the compressor is reduced, too.
- However, the conventional reciprocating compressor as above is mostly vibrated in a lateral direction by nature, that is, in a direction that the piston of the reciprocating motor moves. Nevertheless, the lateral stiffness of the oil spring is weak because an internal oil of each coil spring for supporting the main body of the reciprocating compressor is formed at regular pitches. For this reason, as shown in
FIG. 2B , a lateral displacement (L) of the compressor becomes great, and thus the compressor main body is excessively inclined, thereby making the vibration of the compressor severe. - Therefore, it is an object of the present invention to provide a reciprocating compressor having a supporting unit attenuating a lateral displacement capable of minimizing lateral vibration of a compressor, which is generated in a direction that a reciprocating motor is operated when the reciprocating compressor is in operation.
- To achieve the above object, there is provided a reciprocating compressor comprising: a casing including a suction pipe through which a fluid is introduced from the outside and a discharge pipe through which the fluid is discharged outside and forming a predetermined internal space; a compressor main body positioned in the casing, compressing the fluid introduced through the suction pipe by a linear reciprocating motion of a piston and discharging the compressed fluid through the discharge pipe; and a supporting unit including a plurality of coil springs connecting the compressor main body to the casing, wherein the plurality of coil springs include, respectively, end coils tightly wound to be fixed to one surface of the compressor main body and to one surface of the casing; and an inner coil positioned between the pair of the end oils and having at least one part wound tightly.
-
FIG. 1 is a longitudinal sectional view of a conventional reciprocating compressor; -
FIG. 2A is a side view showing a oil spring of a conventional reciprocating compressor; -
FIG. 3A is a view showing a lateral displacement of a oil spring of a conventional reciprocating compressor; -
FIG. 3 is a longitudinal sectional view showing one example of a reciprocating compressor in accordance with the present invention; -
FIG. 4 is a partial longitudinal sectional view of a reciprocating compressor, for showing a coil spring in accordance with a first embodiment of the present invention; -
FIG. 5A is a side view showing a oil spring in accordance with a first embodiment of the present invention; -
FIG. 5B is a view showing a lateral displacement of a coil spring in accordance with a first embodiment of the present invention; -
FIG. 6 is a partial longitudinal sectional view of a reciprocating compressor, for showing a coil spring in accordance with a second embodiment of the present invention; -
FIG. 7A is a side view showing a oil spring in accordance with a second embodiment of the present invention; -
FIG. 7B is a view showing a lateral displacement of a coil spring in accordance with a second embodiment of the present invention; -
FIG. 8 is a partial longitudinal sectional view of a reciprocating compressor, for showing a coil spring in accordance with a third embodiment of the present invention; -
FIG. 9A is a side view showing a oil spring in accordance with a third embodiment of the present invention; and -
FIG. 9B is a view showing a lateral displacement of a coil spring in accordance with a third embodiment of the present invention. - Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.
-
FIG. 3 is a longitudinal sectional view showing a reciprocating compressor in accordance with the present invention. - As shown therein, the reciprocating compressor in accordance with the present invention includes: a
casing 100 forming an exterior of a compressor, having a certain space therein and including a suction pipe (SP) through which a refrigerant gas is introduced and a discharge pipe through which the refrigerant gas compressed in the compressor is discharged outside; a compressormain body 700 positioned in thecasing 100, for compressing and discharging the sucked refrigerant gas; and a supportingunit 600 including a plurality of oil springs elastically connecting the compressormain body 700 to one surface of thecasing 100 so that themain body 700 is fixed to thecasing 100. - The compressor
main body 700 includes aframe unit 200 elastically connected to the supportingunit 600 and forming the whole frame of themain body 700; a reciprocatingmotor 300 fixedly installed at theframe unit 200, for generating a linear reciprocating driving force; and acompressing unit 400 supported by theframe unit 200, for compressing the sucked refrigerant gas by a driving force of the reciprocatingmotor 300. - The
frame unit 200 includes afront frame 210 having one surface supported by the supportingunit 600 and fixing one surface of the reciprocatingmotor 300; amiddle frame 220 fixed to the other surface of the reciprocatingmotor 300 fixed at thefront frame 210; and arear frame 230 having one surface elastically fixed to the supporting unit 500 and connected to themiddle frame 220. - The
reciprocating motor 300 includes anouter stator 310 fixedly installed between thefront frame 210 and themiddle frame 220 and having awinding oil 340 therein; aninner stator 320 facing theouter stator 310 at a certain interval and fixedly installed at one side of thefront frame 210; and arotor 330 linearly moving between theouter stator 310 and theinner stator 320. - The
compressing unit 400 includes acylinder 410 inserted into thefront frame 210 to be fixed thereto; apiston 420 having a path (F) for a refrigerant gas therein and having one end connected to therotor 330 to thereby reciprocate in thecylinder 410; asuction valve 430 installed at a front end surface of thepiston 420, for opening and closing the refrigerant gas path (F); and a discharge valve assembly 440 installed at one end surface of thecylinder 410, for controlling discharge of the compressor refrigerant gas. Accordingly, a compressing space (P) is formed between thesuction valve 430 and the discharge valve assembly 440. - Here, a front
resonant spring 510 and a rear resonant spring 502 causing a resonant motion of thepiston 420 are installed between one end of thepiston 420 connected to therotor 330 and one end of thefront frame 210 and between the one end of thepiston 420 and one end of therear frame 230, respectively. - A plurality of coil springs constituting the supporting
unit 600 include, respectively, afront coil spring 610 connecting thefront frame 210 to one surface of thecasing 100; and arear coil spring 620 connecting therear frame 230 to one surface of thecasing 100 so that themain body 700 is elastically fixed to the inside of thecasing 100. - As shown in
FIG. 3 , the plurality ofoil springs oil spring inner coil 580 wound plural times andend coils 590 formed at both ends of theinner coil 580. - The
inner oil 580 has at least one part which is tightly wound so as to reduce vibration of the compressormain body 700, which is generated in a direction that thepiston 420 moves. And, theend coil 590 is tightly wound so that thecoil spring main body 700—thefront frame 210 and therear frame 230—and to one surface of thecasing 100. - There may be a plurality of embodiments of a reciprocating compressor having a supporting
unit 600 including the plurality ofoil springs -
FIG. 4 shows one of plural coil springs constituting a supporting unit of a reciprocating compressor in accordance with a first embodiment of the present invention. - Even though only one front oil spring is depicted in
FIG. 4 , the same structure as that depicted in the drawing is applied to the rest of the coil spring of the reciprocating compressor. A structure depicted in another drawing for another embodiment to be described later is also applied to the rest of the coil spring of the corresponding compressor. - The
coil spring casing 100 and one surface of the main body, particularly, one surface of theframe unit 200; and aninner coil 580 wound and connected to theend coil 590. - The
inner coil 580 includes a pair ofelastic parts 631 having predetermined pitches (t) from theend coil 590 toward the central portion of the coil spring; and amass part 632 formed at the central portion of the coil spring between the pair ofelastic parts 631 and tightly wound without any interval. - The winding number of the
mass part 632 is twice ˜four times as many as that of theend coil 590 so that thecoil spring reciprocating motor 300 and acompressing unit 400. - The pair of
elastic parts 631 is wound having regular pitches. - In addition, each of the
elastic parts 631 may be wound at pitches (T) decreased as it goes from theend coil 590 toward themass part 632 or may be wound at pitches (T) increased as it goes from theend coil 590 toward themass part 632. - In addition, each of
elastic parts 631 may be wound at pitches increased and decreased alternately between theend part 590 and themass part 632. - The oil spring has longitudinal stiffness and simultaneously lateral stiffness by including the pair of
elastic parts 631 and themass part 632 between the pair ofelastic parts 631. - As shown in
FIGS. 5A and 5B , as themass part 632 which is wound tightly is formed between the pair ofelastic parts 632, the lateral stiffness of the coil spring is increased, thereby attenuating a lateral displacement (L1) of the compressormain body 700 and so effectively reduce the vibration of the compressor main body. -
FIGS. 6 and 7 show a coil spring constituting a supporting unit of a reciprocating compressor in accordance with a second embodiment of the present invention. - As shown in
FIG. 6 , acoil spring end coil 590; and aninner oil 580 including a pair ofmass parts 641 which are tightly wound right next to theend coil 590; anelastic part 642 wound at predetermined pitches (t) between the pair mass parts. - The winding number of the
mass part 641 preferably is two ˜four times as many as that of theend coil 590. - The
elastic part 642 is preferably wound at regular pitches (t). - In addition, the
elastic part 642 may be wound at pitches decreased as it goes toward the central portion of thecoil spring - In addition, the
elastic part 642 may be wound at pitches increased and decreased alternately between the pair of themass parts 641. - As shown in
FIGS. 7A and 7B , in this case, the lateral stiffness of thecoil spring mass parts 641 which are tightly wound, thereby effectively attenuating a lateral displacement (L2) generated by the vibration of the compressormain body 700. -
FIG. 8 shows a coil spring constituting a supporting unit of a reciprocating compressor in accordance with a third embodiment of the present invention. - As shown therein, a
oil spring elastic part 652 wound from anend coil 590 fixed at one surface of the compressormain body 700 at predetermined pitches (t1), a secondelastic part 653 wound from anend coil 590 fixed at one surface of thecasing 100 at predetermined pitches (t2) that are different from those (t1) of the firstelastic part 652, and amass part 651 tightly wound between the first and secondelastic parts - The pitches (t1) of the first
elastic part 652 and the pitches (t2) of the second elastic part are regular, respectively, but the two pitches (t1 and t2) are different from each other. - In addition, the first
elastic part 652 and the secondelastic part 653 may be wound at pitches (t1, t2) decreased as it goes from both end coils 592 and themass part 651, and the decreasing ratios of the pitch (t1) and the pitch (t2) may be different from each other. - On the contrary, the first
elastic part 652 and the secondelastic part 653 may be wound at pitches (t1 and t2) increased as it goes from both end coils 592 toward themass part 651, and the increasing ratios of the pitch (t1) and the pitch (t2) may be different from each other. - In addition, the first elastic part and the second
elastic part 653 may be wound at pitches (t1 and t2) increased and decreased alternatively as it goes from both end coils 592 toward themass part 651, and the increasing ratios of the pitch (t1) and the pitch (t2) may be different from each other. - In addition, as other modifications, one of the first and second
elastic parts mass part 651. On the contrary, one of the first and secondelastic parts mass part 651. - In addition, one of the first and second
elastic parts mass part 651. - As shown in
FIGS. 9A and 9 b, by such a construction of acoil spring coil spring elastic part 652 and the secondelastic part 653 are different from each other, a lateral displacement generated by the vibration of the compressormain body 700 can be attenuated, more effectively. - In addition, depending upon a design, the compressor main body may be supported at the casing by properly disposing coil springs constituting a supporting unit of the reciprocating compressor in accordance with each embodiment of the present invention.
- The reciprocating compressor in accordance with the present invention is operated as follows.
- When a current is applied to a winding
coil 340 of anouter stator 310 of areciprocating motor 300, an induction magnetic field having a direction changed by a direction of a current is formed at theouter stator 310, and an electromagnetic force having a direction changed by a direction of the induction magnetic field is generated between theouter stator 310 and theinner stator 320 by interaction between the induction magnetic field and a magnetic field of theinner stator 320. At this time, arotor 330 and apiston 420 are moved together in a direction of the electromagnetic force, and simultaneously, thepiston 420 linearly reciprocates in a cylinder by front and rearresonant springs cylinder 410. Thus, a series of processes of sucking a refrigerant gas into the compressing space (P) and compressing the sucked refrigerant gas until the pressure reaches a certain level and then discharging the compressed refrigerant gas is repeatedly performed. Here, when therotor 330 and thepiston 420 of the reciprocating motor reciprocate, the compressormain body 700, a vibrating body is excessively shaken in a direction that the piston reciprocates, that is, in a lateral direction of the compressor, causing vibration. However, by the present invention, thecoil spring main body 700 includes a mass part functioning as a kind of mass body by being tightly wound. In addition, an elastic part having predetermined pitches is formed near the mass part. Accordingly, the coil spring provides not only an elastic force which is a fundamental property as a coil spring but also high lateral stiffness, thereby attenuating a lateral displacement of the compressor main body and thus effectively reducing the vibration of the compressor. - It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
- As discussed the above, in accordance with the present invention, a reciprocating compressor having a supporting unit attenuating a lateral displacement can minimize lateral vibration of the compressor, which is generated in a direction that a reciprocating motor is operated when the reciprocating compressor is in operation.
Claims (21)
1. A reciprocating compressor comprising:
a casing including a suction pipe through which a fluid is introduced from the outside and a discharge pipe through which the fluid is discharged outside and forming a predetermined internal space;
a compressor main body positioned in the casing, compressing the fluid introduced through the suction pipe with a linear reciprocating motion of a piston and discharging the compressed fluid through the discharge pipe; and
a supporting unit including a plurality of coil springs connecting the compressor main body to the casing,
wherein the plurality of coil springs includes, respectively, end oils tightly wound so as to be fixed to one surface of the compressor main body and to one surface of the casing, respectively; and an inner coil having at least one part which is tightly wound and positioned between the end coils.
2. The compressor of claim 1 , wherein the inner coil comprises:
a pair of elastic parts respectively wound from the end coils at predetermined pitches; and
a mass part tightly wound between the pair of elastic parts.
3. The compressor of claim 2 , wherein each of the elastic parts is wound at regular pitches.
4. The compressor of claim 2 , wherein each of the elastic parts is wound at pitches increased as it goes from the end coil toward the mass part.
5. The compressor of claim 2 , wherein each of the elastic parts is wound at pitches decreased as it goes from the end coil toward the mass part.
6. The compressor of claim 2 , wherein each of the elastic parts is wound at pitches increased and decreased alternately between the end coil and the mass part.
7. The compressor of claim 2 , wherein the winding number of the mass part is two˜four times as many as that of the end coil.
8. The compressor of claim 1 , wherein the inner coil comprises:
a pair of mass parts tightly wound right next to the end coils; and
an elastic part positioned between the pair of mass parts and wound at pre-determined pitches.
9. The compressor of claim 8 , wherein the winding number of the mass part is two ˜four times as many as that of the end coil.
10. The compressor of claim 9 , wherein the elastic part is wound at regular pitches.
11. The compressor of claim 9 , wherein the elastic part is wound at pitches decreased at it goes toward a central portion of the coil spring.
12. The compressor of claim 9 , wherein the elastic part is wound at pitches increased as it goes to the central portion of the coil spring.
13. The compressor of claim 9 , wherein the elastic part is wound at pitches increased and decreased alternately.
14. The compressor of claim 1 , wherein the inner coil comprises:
a first elastic part wound from the end coil fixed to one surface of the compressor main body at predetermined pitches;
a second elastic part wound from the end coil fixed to one surface of the casing at predetermined pitches that are different from those of the first elastic part; and
a mass part tightly wound between the first and second elastic parts.
15. The compressor of claim 14 , wherein the first and second elastic parts respectively have regular pitches, and the two pitches are different from each other.
16. The compressor of claim 14 , wherein the first and second elastic parts are wound at pitches increased as it goes toward the mass part, and the increasing ratios of the pitches of the first elastic part and the pitches of the second elastic part are different from each other.
17. The compressor of claim 14 , wherein the first and second elastic parts are wound at pitches decreased as it goes toward the mass part, and the decreasing ratios of the pitches of the first elastic part and the pitches of the second elastic part are different from each other.
18. The compressor of claim 14 , wherein the first and second elastic parts are wound at pitches increased and decreased alternately as it goes toward the mass part, and the increasing and decreasing ratios of the pitches of the first elastic part and the pitches of the second elastic part are different from each other.
19. The compressor of claim 14 , wherein one of the first and second elastic parts is wound at regular pitches, but the other elastic part is wound at pitches increased as it goes toward the mass part.
20. The compressor of claim 14 , wherein one of the first and second elastic parts is wound at regular pitches, but the other elastic part is wound at pitches decreased as it goes toward the mass part.
21. The compressor of claim 14 , wherein one of the first and second elastic parts is wound at regular pitches, but the other elastic part is wound at pitches increased and decreased alternately as it goes toward the mass part.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020030065648A KR100548441B1 (en) | 2003-09-22 | 2003-09-22 | Apparatus for reducing lateral displacement of reciprocating compressor |
KR10-2003-0065648 | 2003-09-22 | ||
PCT/KR2004/002223 WO2005028868A1 (en) | 2003-09-22 | 2004-09-02 | Reciprocating compressor having supporting unit attenuating lateral dislacement thereof |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080232984A1 true US20080232984A1 (en) | 2008-09-25 |
Family
ID=36643438
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/572,954 Abandoned US20080232984A1 (en) | 2003-09-22 | 2004-09-02 | Reciprocating Compressor Having Supporting Unit Attentuating Lateral Displacement Thereof |
Country Status (5)
Country | Link |
---|---|
US (1) | US20080232984A1 (en) |
KR (1) | KR100548441B1 (en) |
CN (1) | CN100412364C (en) |
DE (1) | DE112004001771B4 (en) |
WO (1) | WO2005028868A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090304525A1 (en) * | 2006-02-28 | 2009-12-10 | Bsh Bosch Und Siemens Hausgerate Gmbh | Linear Drive and Linear Compressor with Adaptive Output |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102889192B (en) * | 2011-07-19 | 2015-03-18 | 中国科学院理化技术研究所 | Linear compressor driven by using moving magnetic type linear oscillation motor |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1963054A (en) * | 1933-08-14 | 1934-06-12 | Powers Spring Corp | Wire spring |
US3058705A (en) * | 1958-03-26 | 1962-10-16 | Westinghouse Electric Corp | Resilient support system for vertical axis motor compressor unit |
US4077619A (en) * | 1975-02-15 | 1978-03-07 | Firma Gebruder Ahle | Helical compression spring made of wire of circular cross section, especially for use in motor vehicles |
US5246215A (en) * | 1989-06-16 | 1993-09-21 | Nhk Spring Co., Ltd. | Spring seat member with notch for ground spring end |
US6193225B1 (en) * | 1997-11-27 | 2001-02-27 | Tama Spring Co., Ltd. | Non-linear non-circular coiled spring |
US6273396B1 (en) * | 1999-03-29 | 2001-08-14 | Denso Corporation | Electromagnetic valve |
US6382607B2 (en) * | 1999-08-19 | 2002-05-07 | Precision Products Group | Methods of manufacturing coils and apparatus for same |
US6485271B1 (en) * | 1998-12-31 | 2002-11-26 | Lg Electronics Inc. | Body supporting apparatus for hermetic compressor |
US7249937B2 (en) * | 2002-10-31 | 2007-07-31 | Matsushita Refrigeration Company | Hermetic electric compressor and refrigeration unit including non-resonating support structure for the compressor |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2932474A (en) * | 1957-10-07 | 1960-04-12 | Gen Electric | Vibration mount |
JPH0633877A (en) * | 1992-07-10 | 1994-02-08 | Sanyo Electric Co Ltd | Sealed compressor |
KR19980078419A (en) * | 1997-04-28 | 1998-11-16 | 윤종용 | Vibration reducing device of the compressor |
BR9802262A (en) * | 1998-06-05 | 2000-03-08 | Stumpp & Schuele Do Brasil Ind | Improvement in suspension for hermetic refrigeration compressors. |
BR0002373A (en) * | 2000-06-20 | 2002-02-05 | Brasil Compressores Sa | Suspension system for hermetic reciprocating compressor |
-
2003
- 2003-09-22 KR KR1020030065648A patent/KR100548441B1/en not_active IP Right Cessation
-
2004
- 2004-09-02 US US10/572,954 patent/US20080232984A1/en not_active Abandoned
- 2004-09-02 DE DE112004001771T patent/DE112004001771B4/en not_active Expired - Fee Related
- 2004-09-02 WO PCT/KR2004/002223 patent/WO2005028868A1/en active Application Filing
- 2004-09-02 CN CNB2004800273465A patent/CN100412364C/en not_active Expired - Fee Related
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1963054A (en) * | 1933-08-14 | 1934-06-12 | Powers Spring Corp | Wire spring |
US3058705A (en) * | 1958-03-26 | 1962-10-16 | Westinghouse Electric Corp | Resilient support system for vertical axis motor compressor unit |
US4077619A (en) * | 1975-02-15 | 1978-03-07 | Firma Gebruder Ahle | Helical compression spring made of wire of circular cross section, especially for use in motor vehicles |
US5246215A (en) * | 1989-06-16 | 1993-09-21 | Nhk Spring Co., Ltd. | Spring seat member with notch for ground spring end |
US6193225B1 (en) * | 1997-11-27 | 2001-02-27 | Tama Spring Co., Ltd. | Non-linear non-circular coiled spring |
US6485271B1 (en) * | 1998-12-31 | 2002-11-26 | Lg Electronics Inc. | Body supporting apparatus for hermetic compressor |
US6273396B1 (en) * | 1999-03-29 | 2001-08-14 | Denso Corporation | Electromagnetic valve |
US6382607B2 (en) * | 1999-08-19 | 2002-05-07 | Precision Products Group | Methods of manufacturing coils and apparatus for same |
US7249937B2 (en) * | 2002-10-31 | 2007-07-31 | Matsushita Refrigeration Company | Hermetic electric compressor and refrigeration unit including non-resonating support structure for the compressor |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090304525A1 (en) * | 2006-02-28 | 2009-12-10 | Bsh Bosch Und Siemens Hausgerate Gmbh | Linear Drive and Linear Compressor with Adaptive Output |
Also Published As
Publication number | Publication date |
---|---|
WO2005028868A1 (en) | 2005-03-31 |
KR20050029396A (en) | 2005-03-28 |
CN100412364C (en) | 2008-08-20 |
DE112004001771T5 (en) | 2006-07-20 |
KR100548441B1 (en) | 2006-02-02 |
DE112004001771B4 (en) | 2008-05-15 |
CN1856648A (en) | 2006-11-01 |
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Owner name: LG ELECTRONICS INC., KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LEE, MIN-WOO;REEL/FRAME:021070/0697 Effective date: 20060425 |
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