US3597123A

US3597123A - Apparatus for feeding and compressing gases and liquids

Info

Publication number: US3597123A
Application number: US829261A
Authority: US
Inventors: Otto P Lutz
Original assignee: Individual
Current assignee: Individual
Priority date: 1969-06-02
Filing date: 1969-06-02
Publication date: 1971-08-03
Anticipated expiration: 1988-08-03

Abstract

A pump having a cylindrical casing and carrying therewithin a tubular, multilayered strip attached along an axial surface line on the inner surface of the casing wherein the circumference of the strip is less than the inner circumference of the casing. Mounted therewithin for rotation and for urging the strip against the inside of the casing is a roller which is driven along a shaft mounted coaxially in the casing.

Description

United States Patent [72] lnventor Otto P. Lutz Bienroder Weg 53, 33 Braunschweig, Germany [21] Appl. No. 829,261 [22] Filed June 2, 1969 [45] Patented Aug. 3,1971

[54] APPARATUS FOR FEEDING AND COMPRESSING GASES AND LIQUIDS 5 Claims,3 Drawing Figs.

[52] U.S.Cl 417/475, 417/476 [51] Int. Cl ..F04b 43/08, F04!) 43/12, F04b 45/06 [50] Field otSeareh 103/148, 149;230/l68; 91/57;4l8/45, 156;417/474,476, 477

[56] References Cited UNITED STATES PATENTS 645,132 3/1900 Robinson 91/57 1,983,033 12/1934 Hutchison 103/149 2,885,966 5/1959 Ford 103/149 2,946,291 7/1960 Roebig 103/149 2,970,748 2/1961 Bendall 230/168 3,212,627 10/1965 Beebee 74/232 3,397,739 8/1968 Miller 103/149 FOREIGN PATENTS 179,324 5 1922 Great Britain 103/149 1,191,815 4/1959 France 103/149 Primary Examiner-Carlton R. Croyle Assistant Examiner-John J. Vrablik Altorney- Browdy and Neimark ABSTRACT: A pump having a cylindrical casing and carrying therewithin a tubular, multilayered strip attached along an axial surface line on the inner surface of the casing wherein the circumference of the strip is less than the inner circumference of the casing. Mounted therewithin for rotation and for urging the strip against the inside of the casing is a roller which is driven along a shaft mounted coaxially in the casing Patented Aug. 3, 1971 Fig-2 Inventor APPARATUS FUR FEEDING AND COMPRESSING GASES AND LIQUIDS This invention relates to an apparatus for feeding and compressing gases and liquids. it is an object of the invention to provide such an apparatus which is of greatest simplicity and low in price, which further has little volume of construction and works with low friction when in operation, but which at the same time is capable ofbeing run at high speeds.

According to the invention this problem is solved by a cylindrical casing compromising plane end walls, a tubular, singlelayered or multilayered strip or tape mounted within said casing and attached along an axial surface line on the inner surface of the casing, the circumference of said strip being smaller than the inner circumference of the casing, and its width being so dimensioned that its lateral edges are at a minimum distance from the end walls, a driving shaft mounted coaxially and rotatably in the end walls, means secured on said driving shaft and disposed within said strip, which means force the strip against the inner wall of the casing substantially linearly, inlet and outlet openings provided in side-by-side arrangement in the cylindrical casing, between which openings the said strip is secured to the casing, the outlet opening being provided with a check valve.

The invention and further features thereof are illustrated in the accompanying drawing and hereinafter described in detail with reference to the drawing, wherein FIG. 1 is a cross section of the apparatus according to the invention;

FIG. 2 is an axial longitudinal section of the apparatus according to the invention with two working chambers and,

FIG. 3 is a sectional detail taken along the edge of the strip or tape adjacent the end walls.

As will be seen from H0. 1 the apparatus comprises a casing 1 closed at its ends by plane end walls. A tubular single layered or multilayered strip or tape 3 is mounted along an axial surface line on the inner surface of said casing by means of attachment blocks 2. The circumference of said strip is smaller than the inner circumference of the casing l. A driving shaft 4 is axially rotatably mounted in bearings provided in the end walls in said casing 1, the said driving shaft being disposed so as to have its driving end extending beyond one of said end walls to the outside. The width of the strip 3 is so dimensioned that it extends along the length of the casing and butts against the end walls with a minimum ofclearance so that it may move relatively to the end walls.

The strip 3 is forced against the inner surface of the casing l substantially linearly by means of a cylindrical roller 5, or a plurality of rollers, as indicated at 6 in FIG. 1. The roller is rotatably mounted on an axle 7 which in turn is radially guided on pins 8, the latter being firmly connected with the driving shaft 4, for example, as shown in the drawing by means of bores in the driving shaft. Pressure springs 9 are provided on the pins 8 between the driving shaft 4 and the axle 7 by which pressure springs the contact pressure for the roller 5 is produced.

An inlet opening 12 and an outlet opening 13 are provided in side-by-side arrangement in the cylindrical casing l. The said two openings are immediately adjacent the axial surface line along which the strip 3 is secured to the inner surface of the casing. A check valve is arranged in the outlet opening, which valve is under the pressure of springs 15.

THe driving shaft 4 and the roller 5 rotate anticlockwise as indicated in FIG. 1 by the arrow; thereby a suction chamber and a pressure chamber 11 are provided. As can readily be seen from the drawing the volume in the pressure chamber 11 will be decreased as the roller 5 proceeds and rotates, and the medium trapped in said chamber will be discharged into the outlet opening 13. At the same time the suction chamber 10 will be increased so that fresh medium is sucked in through the inlet opening 12. The suction chamber 10 has reached its highest volume if the roller 5 has arrived at the surface line of the casing along which the strip is secured. After the roller has passed the opening 12 the volume to be fed is entirely trapped in the pressure chamber 11 and is then discharged through the outlet opening 13.

In the operation described above the strip is merely continuously rolled along the inner wall of the casing 1 so that the material of said strip will be worn only moderately. In order to prevent the strip 3 from kinking where it is attached to the easing the attachment blocks 2 are curved so as to correspond to the minimum radius of curvature of the strip 3 occurring in operation.

The strip 3 consists of an elastic metal layer 31, for example of a very thin spring sheet metal, steel or any other metal. SUitably the strip is made of a plurality of layers, at least one additional layer 32 being made of a plastic material having a low frictional index, for example, polytetrafluoroethylene. Preferably, said plastic layer 32 slightly extends as shown in FIG. 3 beyond the lateral edges of the sheet metal and frictionally engages the end walls 20 of the casing so as to obtain a good sealing effect.

The apparatus above described has the advantage that it is of greatest simplicity and low in price. Further, the apparatus has a high suction volume but little volume of construction. Since the strip substantially rolls along there occurs only a minimum friction. As the pressure chamber practically reduces to zero when the roller 5 approaches the outlet opening 13, and accordingly the clearance volume particularly can be made zero, high degrees of compression are possible. Finally, the apparatus can be operated at high speeds.

in the embodiment shown in FIG. 2 working chambers are provided which are separated from each other by a partition wall 16 which has two plane surfaces. A strip of the tape described above, in this case indicated by 3a and 3b, is mounted in each chamber. The said strips are secured adjacent their lateral edges by means of small attachment blocks 2a.

One end of the driving shaft 4 is mounted in a bearing bush 17 provided in the end wall 18 while the other end ofsaid driving shaft is rotatably mounted in a bearing bush [9 provided in the end wall 20. As is further shown in FIG. 2 the two

rollers

5a and 5b and their

axles

7a and 7b are each mounted on a pair of pins and 8b which are staggered by Said

rollers

5a and 5b are of a width which is somewhat smaller than the distance between the attachment blocks 2a so as to allow the rollers to pass freely between the attachment blocks. By the inflexibility of the strip 30 or 3b a linear contact will be achieved in spite of the smaller width of said

rollers

5a and 5b. By the staggered arrangement of the

rollers

5a and 5b a more uniform feed and a more uniform charging load will be achieved and the driving shaft statically balanced.

The shape of the casing of the single-acting apparatus according to FIG. 1 is easily derivable from the shape of the casing shown in HQ. 2. The casing which substantially is of cylindrical form may also be constructed in a different way. FOr example, instead of constructing the end wall 18 integral with the casing said end wall may as well be constructed so as to be removable as is the end wall 20.

lclaim:

1. An apparatus for feeding and compressing gases and liquids, comprising a cylindrical casing having plane shaft mounted walls, a tubular multilayered strip having at least one layer of spring sheet metal and mounted within said casing along an axial surface line on the inner surface of the casing, means to attach said strip to said casing along said axial surface line comprising two attachment blocks each mounted in axial direction adjacent the lateral edges on the inner surface of the strip, the circumference of said strip being smaller than the inner circumference of the casing and its width being so dimensioned that its lateral edges are at a minimum distance from the end walls, a driving shaft mounted coaxially and rotatably in the end walls, and having arms extending radially outwardly, means secured on said arms of said driving shaft and disposed within said strip, which means force said strip against the inner wall of the casing substantially linearly, said means comprising a rotatably mounted cylindrical roller butting against the inner surface of said strip, the roller being of a width which is somewhat smaller than the distance between the attachment blocks, inlet and outlet openings provided in side-by-side arrangement in the cylindrical casing, between which openings the strip is secured to the casing along the surface line thereof, the outlet opening being provided with a check valve.

2. An apparatus as claimed in claim 1, characterized in that the strip comprises at least one layer ofa spring sheet metal and a layer of plastic material.

3. An apparatus as claimed in claim 2, characterized in that the layer of plastic material slightly extends beyond the lateral edges of the spring sheet metal.

4. An apparatus as claimed in claim 1, characterized in that the roller is rotatably mounted on an axle which is radially slidably supported in the arms, resilient means being provided to force the axle away from the driving shaft.

5. An apparatus as claimed in claim 1, characterized in that at least two working chambers are provided in side-by-side arrangement in a casing, which are separated by a partition wall, each of said chambers comprising a strip, and the contact means on the driving shaft being angularly staggered.

Claims

2. An apparatus as claimed in claim 1, characterized in that the strip comprises at least one layer of a spring sheet metal and a layer of plastic material.