WO2016193491A1

WO2016193491A1 - Seal

Info

Publication number: WO2016193491A1
Application number: PCT/EP2016/062764
Authority: WO
Inventors: Jochen Widenmann
Original assignee: Jochen Widenmann
Priority date: 2015-06-05
Filing date: 2016-06-06
Publication date: 2016-12-08
Also published as: DE102015108891A1

Abstract

The invention relates to a seal (9) for a coupling element (4) of a coupling (1) for connecting at least one liquid-conducting line (2), having an annular sealing element (12) which has a circumferential suction lip (13) on the outer circumference. In the assembled state of the seal (9), the sealing elements (12) of two seals (9, 10) lie against each other in a contact region (14). The sealing element (12) is formed in the contact region (14) such that a specific pressure acting on the inner circumference of the sealing element (12) is capable of allowing liquid or air to exit between two seals (9, 10) pressed together in the assembled state of the seal (9).

Description

poetry

The invention relates to a seal for a coupling element of a coupling for connecting at least one liquid-conducting line according to the closer defined in the preamble of claim 1. The invention further relates to a coupling element for a coupling for connecting at least one liquid-carrying line and a coupling for connecting at least one fluid-carrying line.

So-called Storz couplings are known from the general state of the art, with which, for example, in fire-fighting technology, but also in tank construction or in silo vehicles, fluid-carrying lines are connected to one another. Such Storz couplings have two coupling halves or coupling elements which can be connected to one another by means of a bayonet closure and are standardized in different DIN standards, for example DIN 14300, DIN 14301, DIN 14302, DIN 14303, DIN 14321, DIN 14322 or DIN 14323. So-called blind couplings are used for temporarily unused Storz connections, which, depending on the size, are standardized in one of the DIN standards DIN 14310, DIN 1431 1, DIN 14312 or DIN 14313. These blind couplings, which are to prevent, for example, the ingress of dirt in pumps, must not be put under pressure, since when releasing the dummy coupling under pressure there is a significant risk of accidents. The dummy couplings are therefore attached in practice with chains, so that in the case of an unwanted pressure build-up the far away blasting the clutch is avoided. There are also variants with manually operated drain taps. Further, for this reason, in practice, holes are often drilled in the blind covers of the blind coupling, so that a possibly present at the respective port pressure can escape through the holes. Since they are behind the connection However, in such cases, it may be necessary for the dummy cover to be sufficiently leakproof in such cases. This is especially true in the case that the shut-off devices on the pumps, which are actually responsible for the seal, have slight leaks. In this case, therefore, a blind coupling, in whose blind cover previously holes were drilled, must be exchanged for a blind coupling without holes or it must first be repaired the shut-off.

Since this is associated with great expense and also there is a certain risk that after the test of the pump, the blind cover, which has no holes, remains at the terminal and thus represents a risk of accidents, has been proposed in DE 10 2006 017 257 A1, a Blind cover to be provided with a bore in which a check valve is received. Although this represents a viable solution, but is associated with relatively high costs, which is why in practice usually only for new purchases a blind coupling according to DE 10 2006 017 257 A1 is used, whereas an exchange of existing blind couplings for cost reasons usually does not occur.

The described problem arises not only in the Storz couplings described, but in principle in all used in fire fighting clutches that connect two pressurized, liquid-carrying lines together or in which a line is to be temporarily closed with a dummy coupling. The coupling elements can be connected instead of bayonet with threads or in other ways. The diameter of the coupling or the liquid-carrying line has only a small influence on this problem. Furthermore, find such and similar couplings in areas outside the fire service application, for example, in silo vehicles or the like. The coupling is usually sealed by means of a sealing ring which has a suction lip on its outer circumference and a pressure lip on its inner circumference (a so-called pressure suction ring), or by means of a sealing ring which has a pressure lip exclusively on the inner circumference (a so-called pressure ring). When the two coupling elements are connected to each other, the seals installed in them are biased against each other and thus ensure a seal of the coupling. The pressure lips abutting against one another in the prestressed state thereby prevent leakage of the fluid in the area of the clutch in the pressure mode, whereas the two suction lips in abutment with each other in the installed state of the clutch prevent air from penetrating into the inner area of the clutch during suction operation.

It is an object of the present invention to provide a seal for a coupling element of a coupling for connecting at least one liquid-carrying line, by simple means the ingress of air into the lines in the suction operation is prevented, whereas when a certain internal pressure is exceeded, a pressure reduction over Clutch or via the clutch seals is made possible.

According to the invention, this object is achieved by the features mentioned in claim 1.

In the case of the seal according to the invention, the sealing body is thus embodied in the contact region in such a way that, starting from a specific height of the pressure acting on the inner circumference of the sealing body, a pressure reduction via the seal is possible. In contrast, the existing on the outer periphery of the sealing body suction lip prevents the entry of air through the seal according to the invention. In this way, therefore, there is a seal that is particularly suitable for such applications in which the intake of air is not desired, but in which a particular, pending on the seal Pressure should not be exceeded. In principle, an approximately arbitrary pressure can be set in this way, from which the adjacent seals "open". As a result, it may be possible to dispense with otherwise required pressure relief valves.

The particular advantage of the solution according to the invention is that the seal is much cheaper than the entire coupling element or as a complete blind cover, which is why the seal according to the invention as an ideal retrofit solution for existing and in-use couplings offers. The seal can be used in a variety of coupling systems and is not limited to the so-called Storz coupling. Furthermore, there is no restriction on the seal according to the invention to a specific size or a specific diameter of the coupling or the line. Since in other firefighting couplings the dimensions and geometries differ from the Storz coupling, above all at the sealing ring seat, the seal has a different shape or geometry for each type of coupling.

In a very advantageous development of the invention can be provided that the sealing body is formed in the contact area so that acting on the inner periphery of the seal body pressure in the amount of about 0.1 bar is capable in the assembled state of the seal to allow leakage of liquid or air between two compressed gaskets. Such an embodiment is particularly suitable for the use of the seal according to the invention in a blind cover. However, it should be emphasized that the sealing body can in principle be designed so that when a certain set pressure is exceeded, a pressure reduction takes place.

A very simple way to produce the permeability of the seal from a certain pressure, arises when a present on the inner circumference of the seal body sealing lip is made so shortened that a certain pressure acting on the inner periphery of the seal body is capable of allowing leakage of liquid or air between two compressed seals when the seal is in the assembled condition.

Furthermore, it can be provided that the sealing body has a contour adapted to the pressure to be held by the pressed-together seals. For example, by reducing the material used for the sealing lip and / or a foot region of the seal body, i. H. a targeted weakening of the seal body, a lower pressure adjustable, from which the pressure reduction takes place.

Alternatively or additionally, it can also be provided that the sealing body has a material hardness and / or material composition adapted to the pressure to be held by the pressed-together seals. Since the hardness of the sealing lip or of the entire sealing body has an influence on the suspension properties of the sealing body or the sealing lip, a certain pressure can be set in this way, from which a pressure reduction takes place. This results in an increase in the hardness, an increase in the internal pressure, from which the pressure reduction occurs.

A coupling element for a coupling for connecting at least one liquid-carrying line with a seal according to the invention is specified in claim 6.

A coupling element designed in this way uses all the above-mentioned advantages of the seal according to the invention.

In an advantageous development of the coupling element can be provided that the coupling element is designed as a dummy coupling for closing the at least one liquid-conducting line. Such a dummy coupling is ideally suited for applications where on the one hand the Intake of air through the blind cover and on the other hand, a build-up of internal pressure within the pipe to be prevented.

A coupling for connecting at least one liquid-carrying line, with two coupling elements, wherein at least one of the coupling elements has a seal according to the invention, is specified in claim 8.

Such a coupling can be used in such applications in which a certain pressure within the liquid-carrying line must not be exceeded, in which the suction of air should be prevented, however.

An embodiment of the coupling in which both coupling elements have a seal according to the invention is particularly useful when two liquid-carrying lines are connected to each other and while a certain pressure within the coupling should not be exceeded.

Furthermore, it can be provided that one of the coupling halves is designed as a dummy coupling. Such a blind coupling is particularly suitable for those applications in which both the suction of air through the dummy coupling and a build-up of pressure within the same should be prevented.

Embodiments of the invention are shown in principle with reference to the drawings.

It shows:

Figure 1 is a schematic view of a first embodiment of a coupling according to the invention with two coupling halves in the unassembled state. Figure 2 is a schematic view of a second embodiment of a coupling according to the invention with two coupling halves in the assembled state.

3 shows a first embodiment of the seal according to the invention; and

Fig. 4 shows a second embodiment of the seal according to the invention.

Fig. 1 shows a coupling 1, which serves for connecting two, merely indicated liquid-carrying lines 2, 3, which may for example be designed as hoses. In the present case, the coupling 1 has two coupling halves or coupling elements 4 and 5, which are separated from one another in the embodiment shown in FIG. 1 and connected to one another in the embodiment shown in FIG. In the present case, the coupling 1 is a so-called Storz coupling, as used for example in fire fighting technology, in container construction or in silo vehicles.

A feature of such a Storz coupling is a bayonet closure 6, the respective, so-called lugs 7 and the lugs 7 receiving recesses 8 has. Both the lugs 7 and the recesses 8 are provided on both coupling halves 4, 5. Furthermore, in the embodiment of Fig. 1, each of the coupling halves 4, 5, a seal 9, which are formed in the embodiment of FIG. 1 identical to each other. In the embodiment of Fig. 2, however, two differently designed seals 9 and 10 are provided. Here, the gasket 9 is formed as described in detail below in accordance with the present invention, whereas the gasket 10 may be a known commercial gasket. All seals 9 and 10 are arranged in a respective groove 1 1 of the respective coupling half 4, 5. The seals 9 and 10 designed as sealing rings, in addition to the actual sealing function, also act as Spring element and thus ensure a bias in connecting the two coupling halves 4 and 5 by means of the bayonet closure. 6

In the assembled state of the coupling 1 shown in FIG. 2, in which the two coupling elements 4, 5 are connected to each other by means of the lugs 7 and the recesses 8 of the bayonet closure 6, the two seals 9 and 10 abut each other. Of course, this is also conceivable in the embodiment of Fig. 1, when the two coupling elements 4 and 5 are mounted together.

The two seals 9 and 10, which are shown in more detail in Figures 3 and 4, have an annular sealing body 12, which in turn has on its outer periphery a circumferential suction lip 13. As can be seen, are in the mounted state of the seal 9 and 10, the sealing body 12 of the two seals 9 and 10 in a designated by the reference numeral 14 contact area to each other. Here, each of the two seals 9 and 10 on the contact area 14 and each of the seals 9 and 10 is located with its contact area 14 at the abutment portion 14 of the other seal 9 and 10 at.

Furthermore, the sealing body 12 of the seal 9 according to the invention, as explained in more detail below with reference to several examples, in the contact area 14 is formed so that a certain, acting on the inner circumference of the seal body 12 and the arrow "F _d " designated pressure in the It is possible, in the mounted state of the seal 9, so the state shown in Fig. 2, a leakage of liquid or air between the two pressed-together seals 9 and 10 to allow. The respective circumferential suction lips 13 of the two seals 9 and 10 abut each other, so that an entry of air from outside the clutch 1 through the two seals 9 and 10 is prevented. The force acting on the seals 9 and 10 in the case of suction is denoted by "F _s " in FIG. In this Hang the suction lips 13 are designed so that they act only in the suction direction, ie in the direction of the arrow F _s , whereas they have no sealing effect in the printing direction, ie in the direction of the arrow F _d .

Of course, only fluid between the pressed-together seals 9 and 10 occurs when in the liquid-carrying line 2, a liquid is passed. When the pressure acting on the inner circumference of the seal body 12 is air pressure, air exits between the two gaskets 9 and 10 pressed together.

In particular, if, as is the case in the illustrated embodiment of Fig. 2, one of the coupling halves, namely in the present case, the coupling half 4 is formed as a dummy coupling 4a, it is preferable if the sealing body 12 is formed in the contact region 14 so is that even a very low internal pressure, for example, an internal pressure of 0.1 bar, is able, in the assembled state of the seals 9 and 10, a leakage of the liquid or leakage of air between the two pressed-together seals 9 and 10th to enable.

The operation or the use of such a dummy coupling 4a for closing the coupling element 5 and thus for protecting the underlying components, such as pumps and valves, are known from the prior art and are therefore not described in detail herein. The blind coupling 4a shown in FIG. 2 with the seal 9 inserted in it is suitable for closing both a pressure and a suction connection.

If instead of the dummy coupling 4a via a "normal" coupling element, a liquid-carrying line is connected to the coupling element 5, it may also have a "normal" seal 10, whereby a normal operation of the then also "normal" coupling 1 is possible. The embodiment shown in Fig. 1, in which the two identical seals 9 abut each other, is suitable for an application in which a certain pressure is to be set, which should build up in the liquid-carrying lines 2 and 3 maximum. The abutting seals 9 thus serve as a pressure relief valve. If several such pressure relief valves are installed in a line, redundant safety against pressure surges or hose bursts results. Furthermore, it is possible in the presence of several formed by the seals 9 pressure relief valves to achieve a very large Absteuervolumen so that can be responded to a pressure increase very quickly and effectively.

FIGS. 3 and 4 show two embodiments of the seal 9 according to the invention in more detail. It can be seen in both figures that an existing on the inner circumference of the seal body 12 sealing lip 15, for example, compared to the seal 10 is made so shortened that the above-mentioned effect occurs, namely that a certain, acting on the inner circumference of the seal body 12 pressure is able, in the mounted state of the seal 9 to allow leakage of the liquid between the two pressed-together seals 9 and 10 and thus a pressure drop across the coupling 1.

In order to adapt the seal 9 or 10 to a respective pressure to be held by the pressed-together seals 9 and 10, the contour of the sealing lip 15 can have a contour adapted to the pressure to be held by the pressed-together seals 9 and 10. In this case, a lower pressure is set by reducing the material used for the sealing lip, ie by weakening of the sealing body 12 in this area, from which the gasket 10 compressed seal 9 no longer withstand the pressure and thus pressure is reduced. Conversely, the greater the pressure that the two seals 9 and 10 can hold in the assembled state, the more massive the seal 9 on the inner circumference or in the contact area. rich 14 is executed. For example, the contour can be changed so that the sealing lip 15 extends at a different angle to the central axis of the seal 9.

In the embodiment of Fig. 4, in addition to the changes of FIG. 3, a foot portion 16 of the seal 9 is made less massive, whereby an even lower pressure can be maintained. While the seal 9 according to the embodiment of FIG. 3 withstands a defined internal pressure of, for example, approximately 10 to 15 bar, in the embodiment of FIG. 4, a pressure of approximately 0.1 bar is already possible in the assembled state Condition of the seal 9 to allow leakage of liquid or air between two pressed-together seals 9 and 10.

Alternatively or additionally, it is also possible to select the hardness of the material of the seal 9 or even the hardness of the material of the sealing lip 15 so that the two pressed-together seals 9 and 10 hold a certain pressure and discharge the same from a certain pressure or let escape. This is achieved with a higher hardness, a higher, to be held by the seal 9 pressure.

In the described embodiments, the clutch 1 is a Storz clutch. However, it would also be possible to use the seal 9 according to the invention in another type of quick coupling or hose coupling. Furthermore, it is possible to use the seal 9, as well as the seal 10, in various sizes of the coupling 1.

Claims

Patent claims

A seal (9) for a coupling element (4) of a coupling (1) for connecting at least one liquid - carrying line (2), comprising an annular sealing body (12) having on its outer circumference a circumferential suction lip (13), wherein mounted state of the seal (9), the sealing body (12) of two seals (9,10) in a contact area (14) abut each other,

d a d u r c h e c e n c i n e s that

the sealing body (12) is formed in the abutment region (14) such that a certain pressure acting on the inner circumference of the sealing body (12) is capable of leakage of liquid or air between the assembled state of the seal (9) allow two pressed together seals (9,10).

2. seal (9) according to claim 1,

d a d u r c h e c e n c i n e s that

the sealing body (12) is formed in the abutment region (14) in such a way that a pressure acting on the inner circumference of the sealing body (12) in the amount of approximately 0.1 bar is capable of, in the assembled state of the seal (9) leakage to allow leakage of liquid or air between two pressed-together seals (9,10).

3. seal (9) according to claim 1 or 2,

d a d u r c h e c e n c i n e s that

a sealing lip (15) present on the inner circumference of the sealing body (12) is made so shortened that a specific pressure acting on the inner circumference of the sealing body (12) is capable of escaping in the assembled state of the seal (9) Liquid or air between two pressed together seals (9,10) to allow.

4. seal (9) according to claim 3,

d a d u r c h e c e n c i n e s that

the sealing body (12) has a contour adapted to the pressure to be held by the pressed-together seals (9, 10).

5. seal (9) according to any one of claims 1, 2 or 4,

d a d u r c h e c e n c i n e s that

the sealing body (12) has a material hardness and / or material composition adapted to the pressure to be held by the pressed-together seals (9, 10).

6. coupling element (4) for a coupling (1) for connecting at least one liquid-carrying line (2) with a seal (9) according to one of claims 1 to 5.

7. coupling element (4) according to claim 6,

d a d u r c h e c e n c i n e s that

the coupling element (4) as a dummy coupling (4a) for closing the at least one liquid-carrying line (2,3) is formed.

8. Coupling (1) for connecting at least one liquid-carrying line (2), with two coupling elements (4,5), wherein at least one of the coupling elements (4) has a seal (9) according to one of claims 1 to 5.

9. Coupling (1) according to claim 8,

d a d u r c h e c e n c i n e s that

Both coupling elements (4,5) a seal (9) according to any one of claims

1 to 5 have.

10. Coupling (1) according to claim 8 or 9, characterized in that the coupling (1) is designed as a dummy coupling.