WO2002075192A1

WO2002075192A1 - Valve for discharging a fluidic material

Info

Publication number: WO2002075192A1
Application number: PCT/EP2002/002966
Authority: WO
Inventors: Christoph Schmid
Original assignee: Henkel Loctite Deutschland Gmbh
Priority date: 2001-03-16
Filing date: 2002-03-18
Publication date: 2002-09-26
Also published as: DE20104603U1; EP1370790A1

Abstract

The invention relates to a valve for discharging a fluidic material, comprising a housing (12) containing a channel (20) and a passage (15) for the fluidic material that opens into or traverses the latter, in addition to a valve body (18), which is positioned in the channel (20) so that it can be displaced between two positions and can be controlled by pneumatic pressure. Said valve body closes the passage (15) in one position and releases said passage in the other position. A tubular element (32) is inserted into the channel (20) and the valve body (18) is located in the tubular element (32). The valve body (18) can be subjected to a stress by means of a spring (22) and can be displaced in opposition to the force of said spring (22) by the pneumatic pressure.

Description

Valve for dispensing a fluid

description

The invention relates to a valve for dispensing a fluid. The valve has a housing in which there is a channel and a passage for the fluid opening or crossing the channel. A valve body is slidably disposed in the channel between two positions. Pneumatic pressure allows the valve body to be moved from one position to the other, closing the passage in one position and releasing it in the other position.

In general, the invention relates to a device for dispensing a fluid, with a device for receiving a channel and a passage for the fluid opening or crossing into the channel and with a device which is arranged displaceably in the channel between two positions and by pneumatic pressure is controllable, the device being used to close the passage in one position and to release it in the other position.

Such valves and dispensers are well known, e.g. from DE-A-37 42 221 and US-A-4, 989, 792.

A similar, but magnetically controlled valve is known from WO 00/62941.

Cleaning is particularly difficult for valves that are used to dispense highly viscous liquids and adhesives. Sometimes it is necessary to disassemble the valve.

The invention has for its object to provide a valve for dispensing a fluid, in which the cleaning and maintenance effort is eliminated or is significantly less. According to the invention, this object is achieved in that a tubular element is inserted into the channel of the housing and in that the valve body is arranged to move back and forth in the tubular element.

In general terms, this object is achieved in that a tubular device is inserted into the channel and that the device used for opening and closing is arranged in the tubular device.

Simple injection-molded single-use components can be used as the tubular element and housing, so that cleaning is not necessary. The tubular element can in particular be a commercially available cartridge or cartridge, to the end of which protrudes from the housing by means of a bayonet connection, a cartridge adapter with a compressed air connection for the pneumatic control of the valve can be attached.

The valve body is preferably pressed or pulled into one of its two positions by a spring and moved into the other position by compressed air. The valve can be designed so that the valve body is pressed or pulled into the closed position by the spring, or so that it is pressed or pulled into the open position.

The passage for the fluid is opened and closed by the movement of the valve body. The passage can cross the channel. In the case of a cylindrical housing, for example, the channel can be provided coaxially in the housing, in which case both the inlet part and the outlet part of the passage are arranged radially. It is also possible to provide only the inlet part radially in the housing and to let the outlet part of the passage run coaxially within the tubular element.

The valve body is generally a generally cylindrical piston with one control end and one product-side end. At the control end of this valve body, the spring engages and the valve body is acted upon by the compressed gas, or the compressed gas is supplied from this side. By moving the valve body, the end on the product side can open or close the passage for the product (fluid). At the product end of the valve body, a conical valve head is coaxially inserted, which is pressed against a valve seat to close the passage and is lifted off the valve seat to open the passage.

The valve seat can be inside or outside the tubular element. If it is located within the tubular element, at least the inlet or the outlet part of the passage also penetrates the tubular element. In a particularly preferred embodiment of the invention, the tubular element extends over the entire length of the housing and the valve seat and the outlet part are formed at one end of the tubular element. The outlet part can be a simple pipe socket, the inner end of which forms the valve seat.

The spring is generally a tension spring located on the control side of the valve body. The valve seat can be arranged so that the valve body closes the valve by the spring, or so that the valve body opens the valve by the spring. The compressed air is connected to the control end of the pipe element and fills the entire cross section of the pipe.

There is also the possibility of pressing the valve body to the product-side end of the housing by means of a compression spring and lifting it to the control-side end of the housing by means of the pressure gas. In this case, the compressed gas is conducted laterally into an annular space surrounding the valve body via a connecting piece, a central bore of the valve body and a transverse bore. The valve body is designed as a differential or stepped piston, the larger-diameter end facing away from the valve seat, so that the valve body passes through the pneumatic pressure is pressed against the force of the spring to the control end of the housing.

When using the valve for dispensing highly viscous compositions and adhesives, in particular cyanoacrylics, anaerobic adhesives, UV-curing adhesives and acrylates, cleaning the product passage, which is partly in the valve housing and partly in the pipe element, is sometimes very difficult , These parts are therefore not cleaned, but only used once. The cleaning of the valve body, which consists of a piston and a valve head, is easy. After opening the bayonet catch, the cylinder cap with the spring adapter, the spring and the valve body attached to it can be pulled out of the tubular element. The housing with the inserted pipe element is disposed of and replaced with new parts.

Embodiments of the invention are explained below with reference to the drawing. Show it:

Figure 1 shows the first embodiment of the valve in section.

Figure 2 shows the first embodiment in a spatial section.

Figure 3 shows the second embodiment of the valve in section.

Figure 4 shows the second embodiment of the valve in a spatial section.

Figure 5 shows the third embodiment of the valve in section.

Figure 6 shows the third embodiment of the valve in a spatial section. Figure 7 shows the fourth embodiment of the valve in a section.

Figure 8 shows the fourth embodiment of the valve in a spatial section.

9 shows the fifth exemplary embodiment of the valve in section, this exemplary embodiment being similar to the second exemplary embodiment, but being suitable for highly viscous fluids;

10 shows the fifth exemplary embodiment in a spatial section;

11 shows the cartridge adapter for the compressed air connection in a side view.

12 shows the bayonet catch with the cartridge adapter from FIG. 11 in an axial view from the valve housing in the open state and

Fig. 13 shows the bayonet lock of Fig. 12 in the closed state.

The valve 10 shown in section in FIG. 1 has a

Valve housing 12 with a passage 15 for a liquid product, wherein the passage 15 is controlled by means of a valve body 18 which is slidably arranged in a cylindrical channel 20 of the housing 12. The valve body 18 is under the action of a tension spring 22 and is controlled pneumatically.

The valve housing 12 is cylindrical with an end 24 on the product side and an end 26 on the control side. The passage 15 for the product is located on the end 24 on the product side. This is composed of a radial inlet part 14 and an axial outlet part 16. At the entrance of the inlet part 14 there is an internal thread 28 for a product feed. The inlet part 14 opens into the axial channel 20 and continues in an axial outlet part 16 which is coaxial to the channel 20 and emerges from the housing 12 on the end face of the product. A valve seat 30 is located in the transition from the inlet part 14 to the outlet part 16.

A tubular element 32 is inserted into the axial channel 20, which protrudes from the control-side end of the channel 20 and extends to the point where the inlet part 14 opens into the channel 20. The tubular element 32 is relatively thin-walled and made of plastic. Its nominal diameter is slightly larger than the inside diameter of the channel 20, so that it is pushed into the channel 20 with a press fit. The valve body 18 moves within the tubular element 32 and is sealed by two peripheral seals 34, 36 in the tubular element 32. The end of the tubular element protruding from the valve housing 12 has wing-like or flange-like radial lugs 38. These lugs are encompassed by a cartridge adapter 40 which, together with the lugs 38, forms a bayonet connection and serves to connect the valve 10 to a compressed air source. For this purpose, the cartridge adapter 40 has an axial plug nipple 42, onto which a compressed air hose can be pushed. The end 46 of the cartridge adapter 40 facing the valve housing 12 is tubular and is received by the tubular element 32 with little play. O-rings 44 seal the outside of the tubular end 46 against the inside of the tubular element 32. A likewise tubular spring adapter 48 is screwed into the end 46 of the cartridge adapter 40. The tension spring 22 is suspended on a cross pin 50 in the spring adapter 48 and a further cross pin 52 in a recess 54 at the control end of the valve body 18, so that the valve body 18 is pulled towards the control end of the valve housing 12.

The valve seat 30 is formed by a conical constriction 56 on both sides of the channel 20 between the mouth of the inlet part 14 and the outlet part 16, specifically by the conical surface of this constriction facing the product end. narrowing. At the product end of the valve body 18, a mushroom-shaped valve head 60 is screwed in, the widened head of which has a conical surface facing the valve seat 30. This conical surface is pulled by the tension spring 22 against the valve seat 30, so that the valve 10 is normally closed. The spring 22 is not shown in all figures with its individual turns, but only through its envelope. By supplying compressed air via the cartridge adapter 40, the valve body 18 can be moved against the force of the spring 22 to the end 24 on the product side, the valve 10 then opening, so that the product, for example a highly viscous adhesive via the inlet part 14, passes by Valve seat 30 is output from the outlet part 16. In the area of the outlet part 16, the channel 20 is widened in steps and a screw 62 is screwed into the enlarged area, which has a central bore 64, into which an outlet connection 66 is screwed from the outside. This screw 62 is also used to adjust the end position of the valve body 18 of the open valve 10. In this way, the metering rate and the amount of sucked back product to be dispensed can be adjusted.

For maintenance and cleaning of the valve 10, the adjusting screw 62 is unscrewed with the outlet connection 66. In order to be able to pull the valve body 18 out by opening the bayonet catch at the control end of the valve 10, the valve head 60 is first unscrewed from the valve body 18. Cleaning the inlet part 14 and the valve seat 30 is tedious and the valve housing 12 with the tube element 32 seated therein is therefore not reused. These are simple injection molded parts with low manufacturing costs. The remaining parts that come into contact with the product, such as the end of the valve body 18 on the product side, the valve head 60, the adjusting screw 62 and the outlet connection 66, can be cleaned without any problems, since all through channels are easily accessible from the outside. The remaining parts of the valve 10, in particular the control end of the valve body and the tension spring 22, do not come with the product in contact, so that cleaning is not necessary anyway. These parts are therefore inserted into a new valve housing 12 with a pressed-in tubular element 32 and secured by means of the bayonet catch. The valve head 60 is then screwed on and the adjusting screw 62 and the outlet connection 66 are screwed in.

3 and 4 show in longitudinal section a second embodiment, which differs from the embodiment of FIGS. 1 and 2 in that both the inlet part 14 and the outlet part 16 of the passage 15 extend radially to the axis of the valve housing 12. The inlet part 14 and the outlet part 16 are offset along the axis of the valve housing 10, so that the inlet part 14 on one side and the outlet part 16 on the other side of the valve seat 30 opens into or leaves the channel 20. In this exemplary embodiment too, the channel 20 is widened in a step-like manner at the end on the product side and a screw 62 is screwed in here, with no central bore being present in the second exemplary embodiment. The dosing rate and the suction quantity of the product to be dispensed can also be adjusted here using the screw 62.

5 and 6 show in longitudinal section a third exemplary embodiment which differs from the exemplary embodiments in FIGS. 1 to 4 in that the tubular element 32 extends over the entire channel 20. The passage 15 therefore also penetrates the tubular element 32 and the valve seat 30 is formed in the tubular element 32, for which purpose the inside of the tube narrows conically to the outlet connection 66. This valve 10 is normally open.

For maintenance, only the bayonet lock needs to be opened, whereupon the cartridge adapter 40 with the spring adapter 48 and the valve body 18 hanging thereon by the tension spring 22 can be pulled out of the valve housing 12 and the tubular element 32. φ α

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A particular advantage of the valve according to the invention is that it can largely be manufactured from commercially available components. A cartridge can be used as the tubular element 32, as is offered by GTL Gesellschaft für Löttechnik mbH, D-75173 Pforzheim, under the order numbers 5109, 5110, 5111, 5112, 5113. A cartridge from the same company as is offered under the order numbers 1000Y5148 to 1000Y5152 can be used as the cartridge adapter 40. In the first two exemplary embodiments (FIGS. 1 to 4), the end of the cartridge on the product side is cut off. Type N-M5-PK-3 or -4 from Festo AG & Co. can be used as the plug nipple 70.

The valve 10 according to the invention is compatible with the following adhesives with the materials specified in the list of reference symbols below:

cyanoacrylates

- anerobic adhesives

UV curing adhesives

acrylates

List of reference numbers with material information for the respective components

(Sp = injection molding; D / F = turned / milled part)

Valve valve housing (POM, D / F or Sp) inlet part passage outlet part valve body (POM, D / F or Sp) channel spring (spring steel) product-side end control-side end internal thread valve seat tube element (PP, Sp, disposable item, EFD + GLT) seals ( PTFE / steel) seals (EPDM) lugs (PP) cartridge adapter (PC, Sp, reusable items, EFD + GLT) plug-in nipple (PC) O-ring (EPDM) tubular end spring adapter (aluminum, D / F), 52 Cross bolt (V2A) Cut-out narrowing of valve head (POM, D / F or Sp) Screw (POM, D / F or Sp) Bore (POM) Outlet port (PP) Plug nipple (galvanized steel, reusable item, Festo) Ring (POM, D / F od Sp), 76 O-ring (EPDM) annulus cross plate (PC) pocket cross plate (PC) step, 88 first / second part of the tubular element free space ventilation hole

Claims

claims

1. Valve for dispensing a fluid, with a housing (12) in which there is a channel (20) and a passage (15) opening or crossing the channel for the fluid, with a valve body (18) which in the channel (20) is displaceably arranged between two positions and can be controlled by pneumatic pressure, it closes the passage (15) in one position and releases it in the other position, characterized in that a pipe element (32 ) is inserted and that the valve body (18) is arranged in the tubular element (32).

2. Valve according to claim 1, characterized in that the valve body (18) is loaded by a spring (22) and by the pneumatic pressure against the force of the spring

(22) is moved.

3. Valve according to claim 1 or 2, characterized in that the channel (20) has a conical constriction which forms a valve seat (30), that the valve body (18) consists of a piston and a mushroom-shaped valve head (60), wherein the piston is arranged on one side of the constriction and the widespread valve head (60) is arranged on the other side of the constriction and that the inlet part (14) of the passage (15) in the region of the constriction into the channel

(20) opens.

4. Valve according to claim 1 or 2, characterized in that the tubular element has a conical constriction which forms the valve seat (30), the inlet part (14) of the passage (15) at the constriction through the tubular element

(32) opens into the channel (20).

5. Valve according to one of the preceding claims, characterized in that at the end of the tubular element (32) a Kar- ink adapter (40) is releasably attachable and that the spring (22) is attached as a tension spring to the cartridge adapter (40), so that the valve body (18) by means of the spring (22) by means of the cartridge adapter (40) can be pulled out of the tubular element (32).

6. Valve according to one of claims 1 to 4, characterized in that the spring (22) is a compression spring and that the compressed gas used to control the valve is supplied via an axial channel of the valve body (18) and into an annular space between the valve body ( 18) and tubular element (32) and that the valve body (18) is designed as a stepped piston so that it can be lifted off the valve seat (30) by supplying compressed gas against the force of the spring (22).

7. Valve according to one of claims 1 to 6, characterized in that the tubular element (32) extends over the entire length of the channel (20).

8. Valve according to one of claims 1 to 6, characterized in that the end of the valve body (18) facing away from the passage (15) and corresponding to the area of the channel (20) facing away from the passage (15) has a larger diameter than the end of the valve body (18) facing the passage (15) and the facing region of the channel (20).

9. Device for dispensing a fluid, comprising a device (12) for receiving a channel (20) and a passage (15) for the fluid opening or crossing into the channel and with a device (18) which in the channel ( 20) is displaceably arranged between two positions and can be controlled by pneumatic pressure, the device serving to close the passage (15) in one position and to release it in the other position, characterized in that in the channel (20) a tubular device

(32) is inserted and that the device used for opening and closing

(18) is arranged in the tubular device (32).