JP6872643B2 - Gas pressure limiting valve with an annular gap sheet for controlling and discharging gaseous media - Google Patents

Description

The present invention relates to a pressure limiting valve, particularly a gas pressure limiting valve, for controlling and discharging a gaseous medium having a valve body module, particularly hydrogen, particularly for application in a vehicle having a fuel cell drive.

In the vehicle sector, in addition to liquid fuels, gaseous fuels will play an increasingly important role in the future. Especially in vehicles with fuel cell drives, the hydrogen gas flow must be controlled. At this time, the gas flow is not controlled discontinuously as in the case of injection of liquid fuel, but gas is taken out from at least one high-pressure tank and the ejector unit is taken out through the supply flow pipe of the medium-pressure piping system. You will be guided to. This ejector unit guides the gas to the fuel cell via the connecting pipe of the low pressure piping system.

From Patent Document 1, a pressure limiting valve having a housing and a valve body module is known, the valve body module has a valve body that opens and closes in the direction of the long axis, and the valve body is a seal sheet of a seal sheet plate. It is pressed toward the edge by a closing spring to form a seal sheet. At this time, the closing spring is supported by the closing spring support portion. Based on the configured seal sheet, the pressure limiting valve described in Patent Document 1 prevents the medium from escaping out of the system when in the closed state, unless a specific pressure range is exceeded. As soon as the critical pressure is exceeded in each medium pressure piping system and / or low pressure piping system, the valve body moves away from the seal sheet edge of the seal sheet plate, thus preventing the seal sheet from forming. In this way, the pressure limiting valve opens and allows the medium to escape from each piping system until the system pressure drops below the critical pressure again.

The pressure limiting valve known from Patent Document 1 may have some drawbacks.

When the pressure limiting valve opens only slightly and as a result the opening stroke is small, only a relatively small flow cross section is formed, which results in less medium throughflow. This results in the fact that only a small amount of medium can flow out when the pressure limiting valve opens, especially at the beginning of the opening, so that the pressure reduction in the system requires a high time cost.

Yet another drawback of the pressure limiting valve known from Patent Document 1 is that during the closing process of the pressure limiting valve, the seal sheet edge of the seal sheet plate is closed by colliding with the valve body to form the seal sheet. The final position is to be realized. Due to the material properties of the seal sheet plate, especially the seal sheet edge, which may be made of a particularly hard metal material, and the valve body, impact and impact forces on both of these components can cause damage.

German Patent Application Publication No. 102013204563A1

In the context of claim 1, pressure limiting valves have been proposed specifically for fuel cell systems, the seal sheet plate being configured to have a central region connected to the seal sheet plate via at least one connecting web. The seal sheet plate constitutes an annular flow passage extending in the longitudinal direction, the seal sheet plate or valve body has at least two orbiting seal sheet edges, and these seal sheet edges are in a state where the valve is closed. At one time, it constitutes at least two seal sheets together with a valve body or a seal sheet plate. Thus, the configuration of the pressure limiting valve according to the invention provides the advantage that an already large flow section is released with a small opening stroke of the valve body. Thereby, a rapid reaction behavior can be realized with a large flow rate of the medium, whereby the system overpressure generated can be reduced more quickly. This is because a large flow rate can already be achieved when the pressure limiting valve is not yet fully open. This leads to a longer service life of the fuel cell structure. The resulting system overpressure can be reduced more quickly, which exposes the fuel cell system to overpressure that can damage the components of the fuel cell system, especially the fuel cell, only for a short period of time. ..

Due to the rapid reaction behavior according to the configuration according to claim 1 and by the already large flow rate at the time of the small open stroke of the pressure limiting valve, further avoiding critical overshoot exceeding the set reaction pressure. The service life of the fuel cell structure can be extended in this way.

Dependent claims relate to preferred developments of the invention.

In a preferred embodiment, either the valve body or the seal sheet plate has an elastomer coating, which is the seal sheet edge that orbits either the seal sheet plate or the valve body when the valve is in the closed state. Together, it constitutes at least two seal sheets. At this time, each of the seal sheet plate and the valve body has a rotating stopper, and the rotating stopper limits the press-fitting depth of at least two rotating seal sheet edges into the elastomer coating in the direction of the long axis. In this way, a secure seal of the medium pressure piping system and / or the low pressure piping system can be evoked, and even with the seal sheet plate, which is both components when the pressure limiting valve operates frequently. The wear of the valve body can be reduced. This is because the soft elastomer coating reduces material delamination when the seal sheet plate and valve body components collide with each other when the pressure limiting valve closes due to its elastic and springy properties. Further, the required closing force can be kept low. By utilizing an elastomer coating, a complete seal of the valve can already be achieved with a relatively low closing force between each component, the valve body and the seal sheet plate.

The application of the stopper prevents excessive press-fitting of at least two orbiting seal sheet edges into the elastomer coating, thereby preventing the contact surface of each seal sheet between each component or seal sheet plate and valve body. Can be configured to be smaller. This reduces the load on the elastomer coating due to press fitting of at least two orbiting seal sheet edges and the resulting deformation of the elastomer coating, thereby extending the service life of the elastomer coating and thus the pressure limiting valve as a whole. In addition, the preferred configuration of the pressure limiting valve reduces the adhesion between the seal sheet and the elastomeric coating, especially based on the reduction of the contact surface, which leads to higher accuracy of the open pressure and of the pressure limiting valve. Prevent delayed reaction behavior. This is true for long-term effects throughout the service life of pressure limiting valves, especially with respect to properties such as the elasticity of the elastomeric coating. Further, the pressure limiting valve according to the present invention has a simple and compact structure.

Further, in a preferred embodiment of the invention, the orbiting stopper is arranged so that it does not come into contact with the elastomeric coating of the valve body or seal sheet plate when the pressure limiting valve is closed. By contacting the stopper outside the radial direction of the region having the elastomeric coating. This provides the advantage that the seal sheet plate or the orbiting stopper of the seal sheet plate does not contact the elastic elastomer coating of each contact partner, but rather the inelastic region of the valve body. In this way, it is guaranteed that a certain distance between the seal sheet plate and the valve body when the pressure limiting valve is closed can be observed, especially regardless of the fluctuating closing force applied by the closing spring. In addition, it is ensured that a constant press-fit depth of the seal sheet edge into the elastomeric coating for constructing the seal sheet can be adhered to regardless of external factors that may cause variations in the press-fit depth. The constant press-fit depth of the seal sheet edge to the elastomer coating of the valve body reduces the adhesion between the seal sheet and the elastomer coating, thereby increasing the accuracy of the opening pressure and the best reaction behavior of the pressure limiting valve. And can be realized.

In a preferred development example, the elastomeric coating consists of a plurality of layers, each layer having different material properties, and the lamination is carried out in the longitudinal direction. In this way, an improved seal sheet between each component, the valve body and the seal sheet plate, can be realized, whereas the adhesive force on the seal sheet can be reduced. These advantages are that, for example, the top layer on the side of the elastomeric coating of each contact facing towards the seal sheet plate or valve body has high deformability and elasticity, whereas the first This can be achieved by constructing the two layers with lower deformability and elasticity. Thereby, it is possible to give only the top layer of the elastomeric coating the properties that promote the best sealing and the best sealing sheet. If the seal sheet plate or valve body, in particular at least two orbiting seal sheet edges, presses too much into the elastomeric coating, the components press into a second layer of the elastomeric coating that is less deformable and less elastic. Such material properties of the second layer prevent further press-fitting of the orbiting seal sheet edge into the elastomeric coating, eg, into yet another third layer of the elastomeric coating. The contact surface between the elastomeric coating and the orbiting seal sheet edge can be kept small, which in turn minimizes the adhesive force generated when the pressure limiting valve opens. In addition, due to the low likelihood of deformation of the elastomeric coating in the longitudinal direction over its entire depth, the service life of the elastomeric coating can be improved while maintaining good sealing and encapsulating properties. Elastomer.

In a particularly preferred development example, the orbiting stopper of the seal sheet plate or valve body has at least one flow opening, which extends radially, especially with respect to the major axis, thereby orbiting. Separation volume encapsulation of the gaseous medium between the stopper and the orbiting seal sheet edge is prevented. In this way, when the pressure limiting valve is closed, it is possible to avoid encapsulation of the medium between the orbiting stopper and the orbiting seal sheet edge. When the pressure limiting valve is in the closed state, media encapsulation may occur between the valve body and the seal sheet plate, and the encapsulated medium comes into contact with the medium in the inflow and / or outflow area. Instead, they are encapsulated by these areas. Therefore, the replacement of the medium in the capsule-enclosed region with the medium in the inflow portion and / or outflow portion region is hindered. At this time, the capsule-sealed space is particularly formed between the rotating seal sheet edge of the seal sheet plate, the rotating stopper, and the valve body.

In a particularly preferred development of the pressure limiting valve at this time, the orbiting stopper is intended to have at least one, particularly radial flow opening with respect to the major axis. Through such at least one flow opening of the orbiting stopper, the medium can escape from the encapsulated region, especially to the outflow region, even when the pressure limiting valve is in the closed state. The escape of the medium through the flow opening towards the outflow portion avoids the occurrence of cavitation, which can occur, especially when the pressure limiting valve opens at high speed. By avoiding and / or reducing cavitation, the resulting harmful phenomena to surrounding components can be reduced, thereby reducing damage and / or wear of each component, the seal sheet plate and valve body. Prevented, or at least reduced. In this way, it is possible to realize the advantage that the failure occurrence probability of the entire pressure limiting valve is reduced and the service life of the pressure limiting valve can be extended in this way.

Further, in a pressure limiting valve embodiment based on a particularly preferred development, the medium between the seal sheet plate and the valve body is directed towards the outflow, especially through the flow opening, even when the pressure limiting valve closes at high speed. It has the advantage that it can flow out and no encapsulated area can be constructed that is separated from the inflow and outflow. This provides the advantage that pressure pulsation can be reduced and / or avoided, and pressure pulsation occurs especially in encapsulated spaces when the pressure limiting valve closes at high speed. By avoiding and / or reducing pulsation, the probability of failure of the entire pressure limiting valve can be reduced and thus the service life extended. Further, wear at the edge of the orbiting stopper and the orbiting seal sheet edge is reduced. This is because when the pressure limiting valve is opened only to the minimum or slightly opened, the outflow behavior of the medium in the direction of the outflow portion is improved.

In a preferred embodiment, at least two orbiting seal sheet edges of the seal sheet plate or valve body, particularly at least two orbiting seal sheet edges, are in contact with the elastomeric coating of the seal sheet plate or valve body and at least two seal sheets. The regions that make up the are heat treated and / or have a coating. In this way, it is possible to reduce the adhesive force between the orbiting seal sheet edge of the seal sheet plate and the elastomer coating of the valve body. This advantage is made possible by having at least two orbiting seal sheet edges heat treated, especially in areas where the seal sheet edges are in contact with the elastomeric coating, and / or having a coating. The heat treatment, on the other hand, can reduce the adhesive force by reducing the surface area of the seal sheet edge, which may have small undulations and stains in the unheated state. On the other hand, heat treatment of the seal sheet edge can change the properties of each material so that higher hardness of the surface can be achieved, thereby causing adhesion phenomena that can occur between the seal sheet edge and the elastomeric coating. Probability is reduced.

This has the advantage that higher accuracy of the open pressure and the best reaction behavior of the pressure limiting valve can be achieved. In addition, heat treatment of the seal sheet edge can result in higher wear resistance and, with concomitantly, a longer service life of the component or seal sheet plate or component or valve body. The coating of the orbiting seal sheet edge, on the one hand, can reduce the adhesion by reducing the surface area of each region of the seal sheet edge in contact with the polymer coating, which has a very small surface roughness. By selecting a coating with. On the other hand, depending on the material properties, it is possible to select a coating that constitutes a very low adhesion property, especially when paired with an elastomeric coating material. Thereby, the adhesive force can be minimized, and the higher accuracy of the opening pressure and the best reaction rate of the pressure limiting valve can be realized.

In a preferred embodiment, the valve body is coupled to a sleeve-like member, the closing spring is supported by the valve body through the member, and the valve body serves to guide a particularly sleeve-shaped member and particularly a closing spring. It is guided in the direction of the long axis in the housing via the guide member. In this way, it is possible to extend the service life of the pressure limiting valve. This is because the complexity of the pressure limiting valve is reduced due to the reduced number of individual parts. In addition, there is no need for a separate guide in the longitudinal direction within the housing of the valve body, which is a component. This is because the sleeve-shaped member on which the closing spring is supported is already guided in the housing by the guide member. At this time, the guide member serves to guide the closing spring on the one hand, and indirectly guides the valve body via the sleeve-shaped member on the other hand. By such a measure, the probability of failure of the pressure limiting valve can be reduced and the service life can be extended.

In a preferred embodiment, the pressure limiting valve extends linearly over the path in which the spring force of the closing spring compresses or relaxes, especially when the valve body and / or sleeve-like member moves in the longitudinal direction. In particular, the closing spring is made to have a spring constant that changes progressively over the spring path. Further, at this time, the spring constant of the closing spring that changes progressively is realized by changing the winding diameter of the closing spring over the length in the direction of the long axis, and / or the spring having at least two closing springs. It is composed of segments and is realized by each spring segment having a different spring constant. In this way, the sealing and capsule sealing properties of the seal sheet can be improved, whereas the valve body and / or seal sheet plate, especially the elastomer coating, the orbiting stopper, and at least two orbiting seal sheets. Wear of each component called the edge is reduced. This is especially true in cases where the pressure limiting valve has been closed for a long period of time and thus the seal sheet remains configured. The progressively changing spring constant allows high forces to be utilized in the direction of the long axis of the valve in the region of the closing motion path, during which the valve body is fully open, especially when the closing spring receives maximum compression. It is possible to start closing from the position. The valve body approaches the closing position and thus approaches the contact portion with the seal sheet plate in the long axis direction, but while not yet in contact with the seal sheet plate, the valve body approaches the long axis direction. The spring force gradually decreases as the path travels. In the region of the final closing motion of the pressure limiting valve, that is, in the region where the valve body moves in the longitudinal direction to contact the seal sheet plate, the spring constant and the spring force associated therewith decrease. As a result, at least two seal sheet edges are applied to the elastomer coating with a soft low force, and finally the seal sheet can be formed and at least two seal sheets are contacted with the stopper. It allows the edges to move into the elastomeric coating.

Thereby, this preferred embodiment of the pressure limiting valve provides the advantage that the pressure limiting valve is guaranteed to close at high speed. In that case, a high spring force is applied based on the high spring constant during the initial closing motion of the valve body. However, in the remaining closing motion of the valve, and especially when the elastomer coating is hit by at least two orbiting seal sheet edges, a progressive reduction in the force of the closing spring is triggered, thereby avoiding damage to the component elastomer coating. It can also reduce damage to surrounding components due to impact forces. Thereby, the service life of the pressure limiting valve can be extended. Yet another advantage is provided based on the preferred embodiment, and a more compact design form of the closing spring can be realized, which leads to cost reduction based on material reduction.

In a preferred development, the closing spring and / or sleeve-like member is guided in the housing via a guide member in the longitudinal direction, and the guide member is placed between the closing spring and the housing. In this way, the three movable components required for valve opening and closing functions can be guided within the housing by the use of only one component. These three movable components are a valve body with a closing spring, a sleeve-like member, and an elastomeric coating. By arranging a guide member between the closing spring and the housing, it guides the closing spring, prevents the closing spring from tilting when the pressure limiting valve opens and closes, and induces simplification and speeding up of assembly. It becomes possible. Such simplified and speedy assembly provides the advantages that the assembly cost can be reduced and the occurrence of defects at the time of assembling the closing spring can be reduced. This is because, based on the shape of the guide member, it is possible to avoid the risk of incorrect insertion or positioning of the closing spring during assembly.

Further, through the placement of the guide member outside the range of the flow-through region of the medium, especially by moving the guide member out of the range of the region of at least one passage opening in the sleeve-shaped member in the longitudinal direction. The best penetration of the medium from the inflow to the outflow is achieved when the pressure limiting valve is opened. In addition, the service life of the pressure limiting valve can be extended. This is because the complexity of the valve is reduced based on the reduced number of individual parts.

Next, examples of the present invention will be described in detail with reference to the accompanying drawings. The drawings show the following:

FIG. 5 is a schematic cross-sectional view showing a gas pressure limiting valve based on a preferred embodiment of the present invention, in which the gas pressure limiting valve is in a closed state. FIG. 5 is a schematic cross-sectional view showing a gas pressure limiting valve based on a preferred embodiment of the present invention, in which the gas pressure limiting valve is in an open state. FIG. 2 is a cross-sectional view of an enlarged drawing showing the orbiting stopper represented by the reference numeral V together with the flow opening. FIG. 1 is a cross-sectional view showing a seal sheet plate represented by reference numerals AA in FIG. It is a schematic diagram which shows the fuel cell structure according to this invention which has a fuel cell and at least one gas pressure limiting valve of FIG.

Referring below to FIGS. 1 and 2, a schematic cross-sectional view of a pressure limiting valve 1, particularly a gas pressure limiting valve 1, for controlling and discharging a medium based on a preferred embodiment, particularly a gaseous medium. It is shown. The pressure limiting valve 1 shown serves to control the medium supplied to the fuel cell 30 of the vehicle, especially gaseous hydrogen, and to expel when a certain pressure range is exceeded.

As is clear from FIG. 1, the gas pressure limiting valve 1 includes a housing 7, a valve body module 17, a sleeve-shaped member 13 on which the closing spring 8 is supported, and a guide member 9 for guiding the closing spring 8 in particular. And the closing spring support portion 11. Further, the valve body module 17 has a seal sheet plate 2 and a valve body 3, and the valve body 3 abuts on the sleeve-shaped member 13 in the direction of the long axis 14, or in another embodiment, the sleeve. It is combined with the shaped member 13. Further, the sleeve-shaped member 13 has at least one through opening 15, whereby the medium from the inflow portion II to the outflow portion III in the direction of the major axis 14 when the gas pressure limiting valve 1 is opened. Throughflow is possible. At this time, at least two passage openings 15 may be arranged so as to orbit the sleeve-shaped member 13.

Further, the valve body 3 has an elastomer coating 4, and the elastomer coating 4 is arranged on the side of the valve body 3 facing the seal sheet plate 2 when viewed in the direction of the long axis 14. Further, the valve body 3 can have a notch 34 through which the gaseous medium passes from the region of the inflow portion II to the region of the outflow portion III, in particular at least one, when the gas pressure limiting valve 1 is opened. In addition to the opening, it can flow through the pressure limiting valve 1.

The seal sheet plate 2 is constructed rotationally symmetrically about the long axis 14, and also covers a central region 20 connected to the seal sheet plate 2 via at least one connecting web 29 extending radially with respect to the long axis 14. The seal sheet plate 2 constitutes an annular flow passage portion 23 extending between the central region 20 and the seal sheet plate 2. At this time, the flow passage portion 23 extends in an annular shape through the entire seal sheet plate 2 in the direction of the major axis 14, thereby separating the seal sheet plate 2 and the central region 20 so that the central region 20 is at least 1. It is connected to the seal sheet plate 2 via two connecting webs 29. Further, the flowing medium comes from the direction of the inflow portion II, passes through the annular flow passage portion 23, and as shown in FIG. 1, at least two orbiting seal sheet edges 12a and 12b of the seal sheet plate 2 form a valve body 3. With the elastomer coating 4 of the above, the process proceeds to the region constituting the two seal sheets 6a and 6b. On the one hand, the seal sheet edge 12b that circulates at this time is concentrically arranged around the long axis 14 in the central region 20 on the side facing the valve body 3. On the other hand, the orbiting seal sheet edge 12b is arranged on the outer diameter side facing the annular flow passage portion 23 on the side of the central region 20 facing the valve body 3. The rotating seal sheet edge 12a is arranged on the seal sheet plate 2 on the side facing the valve body 3, and the rotating seal sheet edge 12a is on the side of the seal sheet plate 3 facing the valve body 3. On the inner diameter side facing the annular flow passage portion 23, respectively. At this time, the pressure or supply of the connecting pipe 25 (FIG. 5) to the valve body 3 depending on the arrangement of the gas pressure limiting valve 1 on the side facing the inflow portion II, particularly in the region having the elastomer coating 4. A pressure corresponding to the pressure of the flow pipe 28 (see FIG. 5) is generated.

Further, the seal sheet plate 2 has a rotating stopper 5, which abuts here in the direction of the major axis 14 with a region of the valve body 3, and in particular, this region of the valve body 3 is coated with an elastomer coating 4. It is located outside the area of the valve body 3 that it has in the radial direction. This causes the seal sheet edges 12a, 12b to adhere to the elastomer coating 4, which evokes the ability to adhere to the defined spacing between the valve body 3 and the seal sheet plate 2 and causes damage to the elastomer coating 4. Further press fitting is prevented. The elastomer coating 4 extends only partially over the surface of the valve body 3 facing the seal sheet plate 2, and a portion of the surface does not include the elastomer coating 4, which in particular is the seal sheet plate 2. It is a portion of the surface of the valve body 3 that comes into contact with the stopper 5.

Further, the orbiting seal sheet edges 12a, 12b may be heat treated and / or may have a coating, thereby providing an adhesive force generated between the seal sheet edges 12a, 12b and the elastomer coating 4. It can be reduced, and the wear resistance of the seal sheet plate 2 and / or the valve body 3 can be improved. Such adhesive forces occur especially at low temperatures and / or are enhanced by low temperatures.

In one embodiment of the elastomer coating 4, the elastomer coating 4 may be constructed so that the elastomer coating 4 is composed of a plurality of layers, in which the laminate extends in the direction of the major axis 14. As a result, the airtightness of the seal sheets 6a and 6b can be improved between each component of the valve body 3 and the seal sheet plate 2, while the adhesive force of the seal sheets 6a and 6b can be reduced. it can.

An alternative embodiment of the gas pressure limiting valve 1 based on the second embodiment is constructed so that the seal sheet plate 2 has an elastomer coating 4 on the side facing the valve body 3. In this alternative embodiment, the valve body 3 has two seal sheet edges 12a, 12b that orbit around the major axis 14. However, the stopper 5 may also be arranged on the valve body 3 so as to orbit around the long axis 14.

In yet another embodiment of the gas pressure limiting valve 1, the closing spring 8 can have a progressively varying spring constant, which leads to the best closing characteristics of the gas pressure limiting valve 1.

FIG. 2 shows the gas pressure limiting valve 1, where the gas pressure limiting valve is in the open state. In the following, how the opening process of the gas pressure limiting valve 1 proceeds will be described with reference to FIG. As is clear from FIG. 2, the seal sheet plate 2 has an annular flow passage portion 23 through which the gaseous medium is allowed to pass through the tank 27 (see FIG. 5) and / or the ejector unit 10 not shown here. It is supplied from (see FIG. 5) in the direction of arrow II under pressure, which forms the inflow portion II. The seal sheet plate 2 has an annular flow passage portion 23 here, and the medium flowing through the seal sheet plate 2 has an elastomer coating on the valve body 3 with the seal sheet edges 12a and 12b of the seal sheet plate 2 as shown in FIG. Together with 4, the process proceeds to the region constituting the seal sheets 6a and 6b. At this time, the pressure of the connecting pipe 25 (see FIG. 4) is applied to the valve body 3 according to the arrangement of the gas pressure limiting valve 1 on the side facing the inflow portion II, particularly in the region having the elastomer coating 4. Alternatively, a pressure corresponding to the pressure of the supply flow pipe 28 (see FIG. 4) is generated.

In this way, a changing force acts on the valve body 3 in the direction of the major axis 14, and this force is based on the applied pressure of the medium and is applied to the surface of the valve body 3, especially the elastomer coating 4. It acts on the surface in the region of the annular flow passage 23. In this way, a force based on the applied pressure acts on the valve body 3 in the direction of the long axis 14, and when the pressure exceeds a specific pressure, the valve body 3 is moved away from the seal sheet plate 2.

The valve body 3 is movable in the direction of the long axis 14, is coupled with the sleeve-shaped member 13, and is guided radially in the direction of the long axis 14 by the guide member 9, whereby the valve body 3 is radially guided with respect to the long axis 14. Can interfere with the movement of the valve body 3. When a specific pressure level is exceeded on the side of the inflow portion II, the valve body 3 transmits a force to the closing spring 8 via the sleeve-shaped member 13 to obtain a seal sheet plate 2 in the direction of the long axis 14. Move away from. Since the closing spring 8 is in contact with the closing spring support portion 11 on the side facing the sleeve-shaped member 13, the closing spring 8 has a major axis 14 based on its spring constant, especially when a specific force is exceeded. It is compressed in the direction. This is done based on the pressure of the medium on the side of the inflow portion II, which acts on the surface of the valve body 3 and results in a force directed towards the outflow portion III in the direction of the major axis 14. This force is transmitted to the sleeve-shaped member 13 via the valve body 3, and further transmitted from there to the closing spring 8. In particular, when the force corresponding to the spring force of the closing spring 8 is exceeded, the closing spring 8 is compressed in the direction of the long axis 14. At this time, the guide member 9 guides the closing spring 8 and / or the sleeve-shaped member 13 in the housing 7.

The valve body 3 moves away from the seal sheet plate 2 in the direction of the long axis 14, thereby eliminating the seal sheets 6a and 6b, whereby the medium pushes the gas pressure limiting valve 1 from the inflow portion II in the direction of arrow IV. It can flow through to outflow section III. The medium can then reach the outflow section III by two different routes. On the one hand, the medium can flow by the orbiting seal sheet edge 12a and the stopper 5 and through at least one through opening 15 of the sleeve-shaped member 13. On the other hand, the medium can pass by the seal sheet edge 12b and flow through the notch 34 of the valve body 3.

As soon as a portion of the medium is discharged from the system through the outflow section III, the system pressure in the connecting pipe 25 (see FIG. 5) or the supply flow pipe 28 (see FIG. 5) can be standardized and / or reduced again. It can, which reduces the force on the valve body 3 that acts on the basis of pressure. At this time, the force acting in the direction of the long axis 14, particularly the spring force of the closing spring 8, causes the valve body 3 to move toward the seal sheet plate 2 again, and at least two seal sheet edges 12a and 12b again have the elastomer coating 4. It moves in and presses until at least two seal sheets 6a, 6b are formed. The gas pressure limiting valve 1 is closed again at the final position of the valve body 3, especially when the valve body 3 comes into contact with the rotating stopper 5.

In another conceivable embodiment, the closing spring 8 may be configured such that the spring force does not extend linearly over the entire path during compression or relaxation of the closing spring 8. Therefore, the closing spring 8 is designed so that the winding diameter of the closing spring 8 changes, particularly increases or decreases, or the closing spring 8 has at least two spring segments, each having a different spring constant. It may be constructed in. In this embodiment, at least two seal sheet edges 12a, 12b are in contact with the elastomer coating 8 of the valve body 3 or the seal sheet plate 2 and are press-fitted into the elastomer coating 8 in the direction of the major axis 14 only to a certain depth. Thus, at least two seal sheets 6a, 6b are constructed without damaging the elastomeric coating by press fitting too deeply. Therefore, the elastomer coating 8 is placed on the end face of the valve body 3 facing the seal sheet plate 2 or on the end face of the seal sheet plate 2 facing the valve body 3.

FIG. 3 shows a cross-sectional view of the rotating stopper 5 of the seal sheet plate 2 represented by the reference numeral V in FIG. 2 as an enlarged view. Here, the orbiting stopper 5 has a flow opening 16, through which the medium in the gas pressure limiting valve 1 can flow out. Without the flow opening 16, when the gas pressure limiting valve 1 is in the closed state, a capsule is sealed between the rotating stopper 5, the rotating seal sheet edge 12a, the seal sheet plate 2, and the valve body 3. A space will be created. The space encapsulated in this way can damage the gas pressure limiting valve 1, especially during the process of opening and closing the gas pressure limiting valve 1. Yet another embodiment of the flow opening 16 is molded so that the flow resistance to the outflowing medium is reduced, for example by chamfering the edges of the flow opening 16 and / or shaping with flow optimization. May be done.

FIG. 4 shows a cross-sectional view of the seal sheet plate 2 represented by reference numerals AA in FIG. 1 as a plan view in the direction of the long axis 14. Furthermore, it is shown that the seal sheet plate 2 has a central region 20 connected to the seal sheet plate 2 (not shown) via at least one connecting web 29. Further, an annular flow passage 23 is shown, and at least two seal sheet edges 12a, 12b are shown, with the seal sheet edges 12a, 12b orbiting around the major axis 14 (FIG. 1) in particular. Arranged like this. Further, a stopper 5 that circulates with the housing 7 is shown. In FIG. 4, an embodiment of a gas pressure limiting valve 1 in which the orbiting stopper 5 has four flow openings 16 is shown as an example.

FIG. 5 shows an embodiment of a fuel cell system 33 having a gas pressure limiting valve 1 and other components, particularly the anode side of the fuel cell system 33. As is clear from FIG. 5, the ejector unit 10 is connected to the fuel cell 30 via the connecting pipe 25, and the fuel cell 30 includes an anode region 31 and a cathode region 32. The gas pressure limiting valve 1a described in the above drawing may be arranged in the connecting pipe 25 in one embodiment of the fuel cell structure, particularly between the ejector unit 10 and the fuel cell 30. Further, a return pipe 26 for connecting the anode region 31 of the fuel cell 30 to the suction region 22 of the ejector unit 10 is provided. The return pipe 26 can guide the second gaseous medium, which can be a mixture of hydrogen, nitrogen, and water vapor, which occurs in the anode region 31 during operation of the fuel cell 30, back to the suction region 22. it can.

As is more clear from FIG. 5, the first gaseous medium stored in the tank 27 is supplied to the supply flow region 21 of the ejector unit 10 via the supply flow pipe 28. The gas pressure limiting valve 1b described in the above drawing may be arranged in the supply flow pipe 28 in one embodiment of the fuel cell structure, particularly between the first shutoff valve 24 and the second shutoff valve 19. .. The shutoff valves 24, 19 are intended to shut off the supply flow of the first gaseous medium from the tank 27 to the gas pressure limiting valve 1b, or further to the ejector unit 10.

The arrangement of the gas pressure limiting valves 1a, b provides the advantage that the connecting pipe 25 and the supply flow pipe 28 are protected from too high a pressure. This is because when the specified pressure level is exceeded, the respective gas pressure limiting valves 1a and b open to reduce the system pressure. Thereby, the fuel cell 30, which is a component, particularly the diaphragm of the fuel cell 30, and the ejector unit 10 which is a component can be protected from damage. Both of these components react extremely vulnerable to pressure that is too high.

1 Gas pressure limiting valve 2 Seal sheet plate 3 Valve body 4 Elastomer coating 5 Circulating stopper 6a, 6b Seal sheet 7 Housing 8 Closing spring 9 Guide member 11 Closing spring support 12a, 12b Seal sheet edge 13 Sleeve-shaped member 14 Length Shaft 16 Flow opening 17 Valve body module 20 Central area 23 Flow passage 29 Connection web 30 Fuel cell

Claims (10)

It is a gas pressure limiting valve (1) for controlling hydrogen as a gaseous medium, and includes a housing (7) and a valve body module (17), and the valve body module (17) is long. It has a valve body (3) that opens and closes in the direction of the shaft (14), that is, a movable valve body (3) and an immovable seal sheet plate (2), and the seal sheet plate (2) or the valve body (3). Each has a seal sheet edge (12) that orbits about a long axis (14), and the seal sheet edge together with the other component when the valve (1) is in the closed state, respectively, the seal sheet (6). ), And a closing spring (8) disposed in the housing (7) in the direction of the long axis (14), the closing spring (8) having a long axis (14) on one side. In such a gas pressure limiting valve, which is supported by the closing spring support portion (11) in the direction of) and at least indirectly supported by the valve body (3) on the side facing the closing spring support portion (11), the seal sheet plate. (2) is configured to have a central region (20) connected to the seal sheet plate (2) via at least one connecting web (29), the seal sheet plate (2) having a major axis (14). ) Consists of an annular flow passage (23), the seal sheet plate (2) or the valve body (3) having at least two orbiting seal sheet edges (12a, 12b). The seal sheet edge of the above constitutes at least two seal sheets (6a, 6b) together with the valve body (3) or the seal sheet plate (2) when the valve (1) is in the closed state .
The orbiting stopper (5) of the seal sheet plate (2) or the valve body (3) has at least one flow opening (16), and at least one of the flow openings (16) has a major axis (14). ), thereby preventing encapsulation of an isolated volume of the gaseous medium between the orbiting stopper (5) and the orbiting seal sheet edge (12a). A gas pressure control valve characterized by. When either the valve body (3) or the seal sheet plate (2) has an elastomer coating (4), and the elastomer coating (4) is in a closed state, the seal sheet plate. At least two of the seal sheets (6a, 6b) are formed together with at least two orbiting seal sheet edges (12a, 12b) of either (2) or the valve body (3), and the seal sheet plate (2). ) Or the valve body (3) has a orbiting stopper (5), and the orbiting stopper (5) of at least two of the orbiting seal sheet edges (12a, 12b) to the elastomer coating (4). The gas pressure limiting valve (1) according to claim 1, wherein the press-fitting depth is limited in the direction of the long axis (14). The second aspect of the present invention, wherein the valve body (3) or the seal sheet plate (2) comes into contact with the stopper (5) outside the radial direction of the region having the elastomer coating (4). The gas pressure limiting valve (1) described. The gas according to claim 2 or 3, wherein the elastomer coating (4) is composed of a plurality of layers, each layer has different material properties, and the layers are laminated in the direction of the long axis (14). Pressure limiting valve (1). At least two orbiting seal sheet edges (12a, 12b ) of the seal sheet plate (2) or the valve body (3) are the elastomer coating (4) of the seal sheet plate (2) or the valve body (3). ), And / or having a coating in the region constituting at least two of the seal sheets (6a, 6b), according to claims 2 to 4 . The gas pressure limiting valve (1) according to any one item. The valve body (3) is combined with the sleeve-like member (13), the closure spring via the member (8) is supported on the valve body (3), the valve body (3) is pre-Symbol a sleeve-like member (13), before SL via a guide member which serves to guide (9) a closure spring (8), is guided in the direction of the long axis (14) in said housing (7) The gas pressure limiting valve (1) according to any one of claims 1 to 5 , wherein the gas pressure limiting valve (1) is characterized in that. The spring force of the closing spring (8), before Kibentai (3) and / or when moving in the direction of the sleeve-like member (13) is the major axis (14), said closure spring (8) is compressed or not extend linearly across path when relaxed, pre Symbol closure spring (8) is characterized by having a progressively varying spring constant over the spring path, the gas pressure limiting valve according to claim 6 ( 1). The progressively changing spring constant of the closing spring (8) is achieved by changing the winding diameter of the closing spring (8) and / or the closing spring (8) is from at least two spring segments. The gas pressure limiting valve (1) according to claim 7 , wherein each spring segment is configured and is realized by having a different spring constant. The closing spring (8) and / or the sleeve-shaped member (13) is guided in the housing (7) via the guide member (9) in the direction of the long axis (14), and the guide member ( The gas pressure limiting valve (1) according to claim 6 , wherein the 9) is arranged between the closing spring (8) and the housing (7). A fuel cell structure including the gas pressure limiting valve (1) according to any one of claims 1 to 9 , for controlling the supply of hydrogen to the fuel cell (30).

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