EP3204676A1

EP3204676A1 - Shut-off body for a valve and valve comprising said type of shut-off body

Info

Publication number: EP3204676A1
Application number: EP15787452.0A
Authority: EP
Inventors: Jochen ZIMMER
Original assignee: A Raymond SARL
Current assignee: A Raymond SARL
Priority date: 2014-10-09
Filing date: 2015-10-07
Publication date: 2017-08-16
Also published as: CN205388167U; HK1219995A1; DE202015009718U1; WO2016055158A1; CN105508651A; US20170343124A1; BR112017006775A2; DE102014014740A1

Abstract

The invention relates to a shut-off body (1) for a valve which comprises a support ring (2) and an elastic valve membrane (3) which is arranged inside the support ring and which closes the inside of the support ring, said valve membrane is essentially flat.

Description

"Shut-off valve for a valve and valve with such a shut-off body"

The invention relates to a shut-off valve for a valve, which has a support ring and an elastic valve membrane arranged within the support ring, which closes the interior of the support ring. Likewise, the invention relates to a valve with such a shut-off.

From DE 100 47 199 A1 discloses a shut-off valve for a valve is known, which has an O-ring and a membrane connected to the O-ring. The membrane has openings distributed over its circumference, which can release a connecting channel on a cylindrical outer wall of the valve.

Furthermore, from US 5,529,280 a shut-off valve for a valve is known, which has a support ring and disposed within the support ring elastic valve membrane which closes the interior of the support ring. The valve membrane arranged within the support ring has a curved section immediately following the support ring (reference numeral 3 in the figures of US Pat. No. 5,529,280) and a sealing rib 9. Against this background, the invention has the object to provide a shut-off for a valve, which causes a good tightness of the valve even under low pressure forces. This object is achieved by the shut-off body according to claim 1 and the valve according to claim 12. Advantageous embodiments are given in the subclaims and the description below.

The invention is based on the basic idea that in a shut-off with an elastic valve membrane even at low sealing forces good tightness of this shut-off valve can be achieved when the valve diaphragm of the shut-off is substantially flat, which meant in particular the shape of the valve membrane is when the shut-off is considered separately and removed from the valve. The invention thus dissolves from the design of the shut-off, as used in US 5,529,280, the elastic membrane is partially curved and thus produce a pointing away from the sealing surface restoring force, which is detrimental to the sealing of the valve seat and thus requires higher sealing forces. The shut-off body according to the invention for a valve has a support ring and an elastic valve membrane arranged within the support ring. The task of the support ring is essentially to hold the valve membrane (to support). Through the support ring, the valve diaphragm is manipulated. By arranging the support ring at a predetermined location within a valve having the shut-off device according to the invention, the valve diaphragm can also be pre-set for it

Place within the valve. Further, by moving the support ring within the valve, the valve diaphragm may also be moved within the valve, for example, from a position which it occupies in a closed position of the valve to one (or more) positions in one of the open positions of the valve Valve occupies.

The elastic valve membrane used in the shut-off device according to the invention is in particular made of an elastomer. Particularly preferred is the elastic valve membrane of ethylene-propylene-diene rubber (EPDM) nitrile rubber (NBR), fluorocarbon rubber (FKN), acrylate rubber (ACM) or fluorosilicone rubber

(FVMQ). The choice of material, in addition to adjusting suitable elasticity properties, may also depend on the fluid to be sealed against. For example, the use of EPDM or NBR is recommended for sealing against water, while the use of FKM is frequently used for sealing against fuels. It is also conceivable thermoplastic elastomers to be used (TPE). It is also conceivable to produce the elastic valve membrane made of latex.

The use of an elastic valve membrane makes it possible to stretch the valve membrane in the closed position of the valve and according to a preferred embodiment of the invention. By stretching the elastic valve membrane, a restoring force is generated within the valve membrane, which can be used in an advantageous manner as a supplementary sealing force. In such a preferred embodiment, the shut-off is pressed against the valve seat not only by a shut-off force introduced from the outside, but in addition by the restoring force of the stretched valve membrane.

The valve diaphragm according to the invention is essentially flat. In a preferred embodiment, this shaping is due to the fact that the valve membrane is held biased in the support ring. In addition or according to a further preferred embodiment, this shaping also results from the fact that the valve membrane has a very small thickness and / or has a high elasticity, so that it is not suitable for three-dimensional shapes. The substantially flat shape of the valve membrane offers the further advantage that in the preferred embodiment, in which the valve membrane is stretched to close the valve seat, a good and uniform sealing effect can be produced. For example, this would be prevented by the provision of sealing beads, as provided in US Pat. No. 5,529,280, since the valve membrane can not be stretched in the region of such a blocking bead.

In a preferred embodiment, the valve membrane has a thickness of more than 0.1 mm, particularly preferably more than 0.3 mm. In a particularly preferred embodiment, the valve membrane has a thickness of less than 1 mm. In addition to the choice of material, the choice of thickness is a way to adjust the stiffness of the valve diaphragm.

In a preferred embodiment, the support ring has a height measured in the thickness direction of the valve membrane that is at least twice as thick as the thickness of the valve membrane. The support ring is particularly preferably used to manipulate the valve membrane within the valve, for example when the valve is to be opened. Likewise, the support ring can be used to install the valve diaphragm well within their intended position within the valve. For this it is advantageous if the support ring has a shape with which it can be firmly attached in a suitable manner in a valve. This can be achieved particularly well if the support ring does not fall below a certain thickness. Since, according to the invention, in particular a thin valve membrane is preferred, the Height of the support ring particularly preferably twice, more preferably three times, four times or five times thicker than the thickness of the valve diaphragm.

In a preferred embodiment, the support ring is an O-ring.

In a preferred embodiment, the support ring in a plane containing the thickness direction of the valve membrane and extending in the radial direction of the shut-off, a round or elliptical cross-sectional shape. This is especially true for the preferred embodiment in which the support ring is an O-ring. In a preferred embodiment, the shut-off body has a round or elliptical shape, for example with an annular or elliptical annular support ring. In these embodiments, the radial direction of the shut-off body corresponds to one of the radially outwardly from the center, or one of the foci of the ellipse directions. However, embodiments are also conceivable in which the support ring is designed, for example, rectangular or square, or has a different shape. In such embodiments, the radial direction of the shut-off body is understood to be the direction which is directed outward from the centroid of the cross-sectional area of the shut-off body in the plane in which the shut-off body substantially extends. A round or elliptical cross-sectional shape of the support ring in particular allows easy production of the shut-off, for example by compression molding or injection molding.

In a preferred embodiment, the valve membrane is connected to the support ring at the location where the support ring has its maximum extent in the radial direction. In a support ring having the above-described round, or elliptical cross-sectional shape in the plane containing the thickness direction of the valve diaphragm and extending in the radial direction of the shut-off, in particular in the preferred use of an O-ring as a support ring, the valve membrane is particularly preferably in the plane of symmetry of a arranged such support ring. The plane of symmetry is referred to as the plane in which the shape of the support ring above the plane corresponds to the shape of the support ring below the plane. This arrangement of the valve diaphragm relative to the support ring also simplifies the production of the shut-off. Alternatively, embodiments are conceivable in which the valve diaphragm is connected at the location of the maximum extent of the support ring in the thickness direction with the support ring. Such designs are useful when the valve membrane is to be permanently installed in a valve by means of the support ring in a special way.

In a preferred embodiment, the support ring and the valve membrane are integrally formed. This allows the shut-off well with a Produce manufacturing step, for example by compression molding or injection molding. Alternatively, embodiments are conceivable in which the valve membrane is manufactured separately from the support ring and connected to it, for example by joining methods, particularly preferably by gluing or welding. In such an embodiment, the valve membrane is particularly preferably held biased in the support ring. By biasing the separately manufactured and built into the support ring valve membrane the desired stiffness of the valve membrane can be adjusted.

The use of a support ring, to which the valve membrane is attached, makes it possible to choose a very thin valve membrane, which would collapse taken by itself, but by their connection with the support ring receives a predetermined shape.

In a preferred embodiment, the shut-off body has been produced by compression molding. In an alternative embodiment, the shut-off body has been produced by injection molding.

In a preferred embodiment, reinforcing elements are provided in the support ring and / or the valve membrane. Such reinforcing elements may be fibers, for example. In particular, for the support ring provides the provision of reinforcing elements, when the support ring is to be used to hold the valve diaphragm firmly in a certain position within the valve.

In a preferred embodiment, the valve membrane at least partially on a non-stick coating. The use of a non-stick coating allows the valve diaphragm to more easily disengage from the valve seat when the valve is to be opened. Particularly preferably, the valve membrane is provided at least on one side throughout with a non-stick coating. As a non-stick coating is particularly suitable a paint based on silicone and / or PTFE (Teflon).

In a preferred embodiment, the support ring, in particular a support ring with a round cross-sectional shape, represents the outermost element of the shut-off body as viewed in the radial direction. Particularly preferably, the support ring has no projections or projections arranged on the outside in the radial direction.

In a preferred embodiment, the valve membrane closes the interior of the support ring completely so that no fluid passage through the support ring is possible. However, embodiments are conceivable in which the valve membrane has holes in places. Essential for the shut-off is that the valve diaphragm in the areas where they close a fluid opening, tight is and has no holes. By way of example, when the valve membrane rests against a coronal valve seat, this is the region of the valve membrane which bears against the rim and the regions of the valve membrane lying within this region. In order to achieve the sealing effect, however, it is not necessary here to make areas of the valve membrane which, for example, adjoin the support ring directly without any holes. However, embodiments are preferred in which the valve membrane completely closes the interior of the support ring, since it can be assumed that such shut-off bodies can be produced more easily. In addition, by introducing holes material weaknesses would arise, which could cause a detachment of the valve diaphragm of the support ring.

The valve according to the invention has a shut-off device according to the invention. As a result, a valve is created in which a good tightness of the valve can be brought about even with low contact forces on the shut-off.

In a preferred embodiment, the valve has a fluid port which is closed by the valve diaphragm in a closed position of the valve, the fluid port having a valve seat in the form of a rim, more preferably a rim, against which the valve diaphragm is held in the closed position becomes. The rim, or the rim in this embodiment form a sealing surface, against which the valve diaphragm is held in the closed position and thereby seals the fluid port.

In a particularly preferred embodiment, in the closed position of the valve, the circumferential line at which the valve diaphragm is connected to the support ring is located closer to the fluid port than the portion of the valve diaphragm held against the rim such that the valve diaphragm is in proportion to the valve not built-in shape of the shut-off is stretched. In such an embodiment, the edge of the valve seat projects in such a way that the support ring can be arranged closer to the fluid opening than the surface of the edge of the valve seat to be sealed by the valve membrane. The shut-off invention is effectively slipped over the edge, or the rim of the valve seat, whereby the valve diaphragm is stretched.

In a preferred embodiment, in an open position of the valve, the valve diaphragm can be lifted from the edge of the valve seat by the fluid pressure of the fluid supplied to the valve diaphragm through the fluid port while the support ring is held firmly against an element of the valve housing. Thereby, a valve can be provided, the opening of which is automatically effected by adjusting the fluid pressure. Is through the fluid opening to the Valve membrane introduced a fluid whose fluid pressure is below a predetermined threshold, the valve remains closed in this preferred embodiment, because the holding the valve diaphragm in the closed position pressing force is greater than the fluid pressure. If the fluid pressure exceeds the predetermined level, the valve diaphragm lifts off from the edge of the valve seat so that the fluid can flow between the edge of the valve seat and the valve diaphragm to one or more outflow openings of the valve.

In a preferred embodiment, the shut-off body is free-floating within a valve space Such an embodiment can be used to move the shut-off body away from this fluid opening in the event of fluid flow from a first fluid opening into the space Inflowing of the fluid from this fluid opening in the space to allow, while the inflow of a fluid through a further fluid opening into the space of the shut-off can be pressed against the valve seat of the first fluid port and thereby close this fluid port.

In a preferred embodiment of the valve according to the invention, the valve diaphragm of the shut-off body is stretched in a closed position of the valve in relation to the position which occupies the valve diaphragm within the shut-off body in an open position of the valve. The stretching of the valve membrane, in particular the stretching of the valve membrane by an annular body, for example by the rim or a rim of a valve seat allows a good seal even if the shut-off within the valve in relation to an ideal position, he in the closed state would assume, is slightly tilted, or, for example, the valve is shaken or adjust to uneven pressure conditions.

The valve according to the invention can be produced at low cost. These arise in particular by the fact that the shut-off can be easily, for example by compression molding, produced. Likewise, starting from a shut-off body with a valve membrane which is substantially flat in the non-installed state, it is possible to realize a valve with a low overall height.

The biasing of the valve membrane makes it possible to produce a good sealing effect even on rough surfaces of the valve seat, since the stretched valve membrane conforms to the shape of the valve seat.

The shut-off invention and the valve according to the invention are particularly preferably in fluid lines of an automobile, particularly preferably in Fluid lines for windscreen wiper water application. In the end region of such lines, in particular in the vicinity of the nozzles, at which the windshield wiper water is to be applied, such lines should be sealed to prevent the entry of foreign bodies or air or other fluids in the line system of the windscreen wiper fluid and / or a backflow of the fluid to avoid. Frequently, however, only low pressures are present in these areas, which could be used to seal a shut-off. Outflow side, there is often only ambient pressure. Also, often only ambient pressure is present in the lines on the side of the windshield wiper fluid line system (until the fluid is pressurized to dispense it across the nozzle). At the same time, however, shut-off bodies to be driven in the region of the nozzle are to be avoided in order not to make the line system for the windscreen wiper liquid too expensive. This means that a valve must be used, which achieves a good sealing effect even with the use of low sealing forces. At the same time, the sealing forces should be chosen so low that by slightly increasing the pressure of the fluid in the line, the valve can be opened and the windscreen wiper fluid can be discharged. All this is made possible by the shut-off device according to the invention and the valve according to the invention.

A comparable application is found in the venting of gears, or in the drainage of gearboxes, for which the shut-off invention and the valve according to the invention are particularly preferably used. Such valves are intended to prevent the entry of fluids into the transmission. On the other hand, such valves should open when fluid should escape from the transmission. The fluid pressures in this field of application are usually ambient pressures. Again, you want to refrain from driven shut-off. Therefore, it is also expedient to use a shut-off, which can produce a good sealing effect at low pressures, but at the same time release them on the occurrence of a fluid with low fluid pressures in a fluid opening to allow the desired exit of the fluid.

The invention will be explained in more detail with reference to exemplary embodiments of the invention illustrative drawings. Show:

1 shows a cross section through a drainage opening of a vehicle transmission with shut-off valve attached thereto in a first operating situation in a schematic, sectional side view.

Fig. 2, the opening of the vehicle transmission of FIG. 1 in a second

Operating situation, also in a sectional side view;

Fig. 3 is a perspective, schematic view of an outlet nozzle for

Windshield wiper fluid; 4 is a sectional, schematic representation of the outlet nozzle according to FIG. 3 in a first operating situation;

5 is a sectional, schematic representation of the outlet nozzle according to FIG. 3 in a second operating situation;

Fig. 6 is a schematic view of a shut-off device according to the invention;

FIG. 7 shows a top view of the shut-off body according to the invention according to FIG. 6; FIG. and Fig. 8 is a sectional view of the shut-off according to the invention according to

Fig. 6.

The shut-off body 1 shown in FIG. 6 has a support ring 2 designed as an O-ring and an elastic valve membrane 3 arranged inside the support ring 2, which closes the interior of the support ring 2. As can be seen from FIGS. 6, 7 and 8, the valve diaphragm is essentially flat when the shut-off body 1 is removed.

As shown in Fig. 8, the support ring 2 in a plane containing the thickness direction of the valve membrane 3 and extending in the radial direction of the shut-off body 1, a round cross-sectional shape. 6 to 8 show that the valve diaphragm 3 at the point at which the support ring 2 has its maximum extent in the radial direction, is connected to the support ring 2. 4 and 5 show that when installing such a shut-off in a valve torsional forces can cause the shut-off that the support ring 2 is rotated and the connection of the valve membrane is moved to the support ring in a position that is no longer the maximum Extension of the support ring 2 in the radial direction in this installation position corresponds.

FIGS. 6, 7 and 8 show that the support ring 2 and the valve membrane 3 are in one piece. This results from the fact that the shut-off body has been produced by compression molding. In the use shown in FIGS. 1 and 2 of the invention

Shut-off in a drain valve for the transmission housing of a motor vehicle, the valve according to the invention is designed as a valve with freely movable shut-off body 1. Fig. 1 shows a first operating situation of the valve according to the invention. Here, the shut-off body 1 is held in a first position due to its own weight, in which he the drainage opening

10 of the (only partially shown) transmission housing 11 of a motor vehicle releases. Fluid, in particular liquid can emerge from the drainage opening 10 and exit via a gap 12 on the shut-off body 1 over from outlet openings 13. In the operating situation illustrated in FIG. 2, the shut-off body 1 is moved in the direction of the drainage opening 10 by fluid entering via the outlet openings 13. As a result, the valve membrane is brought into contact with a coronal valve seat 14, which is arranged in the region of the drainage opening 10. By fitting to the rim of the valve seat 14, the valve membrane 3 seals the drainage opening 10 from. If the fluid entering through the outlet openings 13 presses the support ring closer to the drainage opening 10 than the part of the valve membrane 3 which is held against the edge, the valve membrane 3 is stretched in relation to the non-installed shape of the shut-off body 1. This results in restoring forces, which lead to an increase in the sealing forces and thus to a better sealing of the drainage opening 10. In addition, the stretching of the valve membrane 3 makes it possible to compensate for roughness or unevenness of the coronal valve seat and nevertheless to lead to a good sealing effect.

The valve shown in Fig. 1 and 2 has a valve cover 17 which is screwed onto a thread 15 of the gear housing 11. In the valve cover 17, the outlet openings 13 are provided. A likewise provided in the valve cover 17 indentation 16 carries the shut-off body 1 in the embodiment shown in FIG. 1 and prevents the shut-off body 1, the outlet openings 13 (partially) closes.

The discharge nozzle 20 shown in Fig. 3 for discharging windscreen wiper water has a nozzle outlet 21 from which the windscreen wiper water emerges. Furthermore, the outlet nozzle 20 has an inlet channel 22 and an outlet channel 23 with which the outlet nozzle 20 can be connected to a windscreen wiper water circuit. Within the outlet nozzle 20, an insert member 24 is provided. The insert element 24 forms a channel 25 through which windscreen wiper water can flow to the outlet nozzle 21. Further, the insert member 24 holds the support ring 2 of the shut-off body 1 according to the invention firmly in the outlet nozzle 20. In the construction situation shown in Fig. 4, the valve diaphragm 3 is pressed against a coronal valve seat 26 of a fluid port 27. The valve diaphragm is stretched a little in relation to the non-installed form of the shut-off body 1. The valve membrane can thereby compensate for unevenness, tolerance deviations in the manufacture of the annular valve seat 26 and rough surfaces of the valve seat 26 and seal the fluid opening 27 well. As a result, it prevents the reflux of the fluid in the chamber 28. Adjacent to the chamber 28, the inlet channel 22 and the outlet channel 23 and thus connect the chamber 28 with the windshield wiper water circuit. If the fluid pressure in the windshield wiper water circuit and thus also within the chamber 28 is increased, the valve membrane is lifted off the coronary valve seat 26 and pressed into a chamber 29 of the insert element 24. As a result, it allows the fluid between the coronal valve seat 26 and the valve membrane 3 and the support ring 2 to flow past into the channel 25.

Claims

claims:

1. shut-off body (1) for a valve having a support ring (2) and within the support ring (2) arranged elastic valve membrane (3) which closes the interior of the support ring (2), characterized in that the valve membrane (3 ) is substantially flat.

2. Shut-off according to claim 1, characterized in that the valve membrane (3) has a thickness of less than 1 mm.

3. Shut-off according to one of claims 1 or 2, characterized in that the support ring (2) has a measured in the thickness direction of the valve membrane (3) height which is at least twice as thick as the thickness of the valve membrane (3).

4. Shut-off according to one of claims 1 to 3, characterized in that the support ring (2) in a plane which contains the thickness direction of the valve membrane (3) and extending in the radial direction of the shut-off (1) has a round cross-sectional shape.

5. Shut-off according to claim 4, characterized in that the valve diaphragm (3) at the point at which the support ring (2) has its maximum extent in the radial direction, with the support ring (2) is connected.

6. Shut-off according to one of claims 1 to 5, characterized in that the support ring (2) and the valve diaphragm (3) are integrally formed.

7. Shut-off according to claim 6, characterized in that the shut-off body (1) has been produced by compression molding.

8. Shut-off according to one of claims 1 to 7, characterized in that in the support ring (2) and / or the valve diaphragm (3) reinforcing elements are provided.

9. Shut-off according to one of claims 1 to 8, characterized in that the valve diaphragm (3) biased in the support ring (2) is held.

10. Shut-off according to one of claims 1 to 9, characterized in that the valve membrane (3) at least partially has a non-stick coating.

11. Valve with a shut-off body (1) according to one of claims 1 to 10.

12. A valve according to claim 11, characterized by a fluid opening (10, 27) which is closed in a closed position of the valve by the valve membrane (3) and having a valve seat (14, 26) in the form of an edge, against which Valve diaphragm (3) is held in the closed position.

13. Valve according to claim 12, characterized in that in the closed position, the circumferential line at which the valve membrane (3) with the support ring (2) is connected, closer to the fluid port (10, 27) is arranged as the part of the valve diaphragm (3), which is held against the edge, so that the valve diaphragm (3) is stretched in relation to the uninstalled shape of the shut-off body (1).

14. Valve according to claim 13, characterized in that in an open position of the valve, the valve membrane (3) by the fluid pressure of the fluid through the opening (27) to the valve membrane (3) brought up fluid from the edge (26) can be lifted, the support ring (2) but is firmly held on an element of the valve housing.

15. Valve according to one of claims 11 to 13, characterized in that the shut-off body (1) freely movable shut-off body (1).