CN216112376U - Sealing structure for valve rod in pressure reducing valve - Google Patents
Sealing structure for valve rod in pressure reducing valve Download PDFInfo
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- CN216112376U CN216112376U CN202122687207.9U CN202122687207U CN216112376U CN 216112376 U CN216112376 U CN 216112376U CN 202122687207 U CN202122687207 U CN 202122687207U CN 216112376 U CN216112376 U CN 216112376U
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- pressure reducing
- valve rod
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Abstract
The utility model discloses a sealing structure for a valve rod in a pressure reducing valve, wherein the pressure reducing valve comprises a valve body, a pressure reducing cavity is arranged in the valve body, a pressure reducing device is arranged in the pressure reducing cavity, the pressure reducing device comprises a valve rod and a diaphragm, the diaphragm is arranged at the bottom of the pressure reducing cavity, a sealing assembly, a spring supporting cover, a return spring and a valve seat are sequentially sleeved outside the valve rod from top to bottom, a valve core is arranged between the valve seat and a valve seat section, a first sealing surface is formed between the valve rod and the valve core, and a second sealing surface is formed between the valve rod and the valve seat. Form nonmetal and metal double seal through first sealed face and the sealed face of second, after first sealed face became invalid, the valve rod downstream made the sealed face of second play, not only guaranteed sealed effect, still improved whole life.
Description
Technical Field
The utility model belongs to the technical field of vehicle-mounted hydrogen supply of fuel cell vehicles, and particularly relates to a sealing structure for an inner valve rod of a pressure reducing valve.
Background
A hydrogen pressure reducing valve is a device that reduces the inlet pressure to the desired outlet pressure and stabilizes the output. In the prior art, when a valve rod is sealed, the structure is single, and the problem of failure of a sealing surface is easy to occur.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a sealing structure for a valve rod in a pressure reducing valve, which has good sealing performance and prolongs the service life.
Therefore, the technical scheme adopted by the utility model is as follows: a sealing structure for a valve rod in a pressure reducing valve comprises a valve body, wherein a pressure reducing cavity is arranged in the valve body, a pressure reducing device is arranged in the pressure reducing cavity, the pressure reducing device comprises a valve rod, a valve seat, a diaphragm and a valve core, the pressure reducing cavity comprises a top section, a sealing section, a pressure reducing section, a valve seat section and a bottom section which are sequentially arranged from top to bottom, the diameters of the top section, the sealing section, the pressure reducing section, the valve seat section and the bottom section are increased from small to large, the diaphragm is arranged at the bottom section of the pressure reducing cavity, a sealing assembly, a spring supporting cover, a reset spring and a valve seat are sequentially sleeved outside the valve rod from top to bottom, the sealing assembly is located in the sealing section, the spring supporting cover and the reset spring are located in the pressure reducing section, the valve seat is located in the valve seat section, and the valve core is arranged between the valve seat and the valve seat section; the valve rod comprises an upper section and a lower section which are sequentially arranged from top to bottom, the diameter of the upper section is larger than that of the lower section, a valve rod inclined plane is arranged between the upper section and the lower section, circular arc transition is adopted between the valve rod inclined plane and the upper section and between the valve rod inclined plane and the lower section, the upper end of the inner side of the valve core is an arc surface, the inner side of the upper end of the valve seat is a valve seat conical surface, a first sealing surface is formed between the arc surface and the valve rod inclined plane, and a second sealing surface is formed between the valve seat conical surface and the circular arc transition surface between the upper section and the valve rod inclined plane.
Preferably, the sealing assembly comprises a conical ring and a pressure-reducing sealing ring which are sequentially arranged from top to bottom, a sealing inclined surface is arranged between the sealing section and the top section, and the upper end surface of the conical ring is a sealing conical surface with the sealing inclined surface matched with each other.
Further preferably, the angle between the sealing conical surface of the conical ring and the axis is 45-60 degrees, and the compression amount of the decompression sealing ring is 30-40%.
Further preferably, be provided with the seal groove that is used for installing the diaphragm on the valve body, the seal groove sets up outside bottom segment below, be provided with the diaphragm sealing washer between diaphragm inboard and the valve body.
The utility model has the beneficial effects that: form first sealed face between valve rod and the case, form the sealed face of second between valve rod and the disk seat, first sealed face is sealed for the nonmetal simultaneously, the sealed face of second is sealed for the metal, after first sealed face makes it inefficacy owing to the impurity that contains in the relief pressure valve gas, under the effect of reset spring and inlet pressure, the catch bar downstream, make the sealed face of second play a role, thereby can prevent effectively that the sealed face of case from becoming invalid and lead to the condition that whole pressure relief device became invalid, whole life has been improved simultaneously.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The utility model will be further illustrated by the following examples in conjunction with the accompanying drawings:
as shown in fig. 1, a sealing structure for a valve rod in a pressure reducing valve, the pressure reducing valve mainly comprises a valve body 1 and a pressure reducing device, a pressure reducing cavity 1a is arranged in the valve body 1, the pressure reducing device is arranged in the pressure reducing cavity 1a, the pressure reducing device mainly comprises a valve rod 2, a valve seat 3, a diaphragm 4 and a valve core 5, and the above is the prior art and is not described herein again.
Decompression chamber 1a includes by the top segment a that sets gradually under to, seal segment b, decompression segment c, disk seat section d, end section e, and top segment a, seal segment b, decompression segment c, disk seat section d, the diameter of end section e is by little big, diaphragm 4 sets up in end section e below, the outer from the top down of valve rod 2 overlaps in proper order has seal assembly, spring support lid 6, reset spring 7 and disk seat 3, seal assembly is located seal segment b, spring support lid 6 and reset spring 7 all are located decompression segment c, disk seat 3 all is located disk seat section d, be provided with case 5 between disk seat 3 and the disk seat section d.
Valve rod 2 is including upper segment 2a and hypomere 2b that set gradually from top to bottom, and the 2a diameter of upper segment is greater than hypomere 2b diameter, set up valve rod inclined plane 2c between upper segment 2a and hypomere 2b, and valve rod inclined plane 2c and upper segment 2a, all adopt the circular arc transition between valve rod inclined plane 2c and the hypomere 2b, case 5's inboard upper end sets up to circular arc face 5a, the upper end inboard of disk seat 3 sets up to disk seat conical surface 3a, form first sealed face between circular arc face and the valve rod inclined plane 2c, form the sealed face of second between the circular arc transition face between disk seat conical surface 3a and upper segment 2a and the valve rod inclined plane 2 c. Preferably, the valve core is made of plastic VESSPE SP1 material, the valve rod is made of stainless steel 316 material, the hardness of the valve seat can reach 28-32HRC, and the hardness of the valve seat is 22-25 HRC.
The sealing assembly comprises a conical ring 8 and a pressure reduction sealing ring 9 which are sequentially arranged from top to bottom, a sealing inclined plane f is arranged between a sealing section b and a top section a, and the upper end face of the conical ring 8 is a sealing conical surface 8a matched with the sealing inclined plane f. When the pressure reducing seal ring 9 slides upwards under the action of gas pressure, when the friction force between the pressure reducing seal ring 9 and the valve body is larger than the axial force of the gas pressure on the pressure reducing seal ring 9, the pressure reducing seal ring 9 stops moving upwards. Along with the increase of the gas pressure, the contact pressure between the gas and the decompression sealing ring 9 is increased, so that the decompression sealing ring 9 continues to move upwards, when the decompression sealing ring 9 moves upwards to press the conical ring 8, the conical ring 8 generates a reaction force on the decompression sealing ring 9 due to the matching of the sealing inclined surface f and the sealing conical surface 8a, and when the sum of the reaction force and the friction force is greater than the axial force of the gas pressure on the decompression sealing ring 9, the decompression sealing ring 9 stops moving upwards, namely a self-sealing effect is formed. Meanwhile, in the process, the pressure reducing sealing ring 9 continuously transmits the gas pressure to the conical ring 8, and under the wedging effect, the conical block upwards slides along the sealing conical surface, so that the gap between the conical block and the valve body is filled up, and the self-sealing effect of the sealing assembly is enhanced, so that the condition that the pressure reducing sealing ring 9 fails due to extrusion can be avoided.
Preferably, the angle between the sealing cone surface 8a and the axis of the conical ring 8 is between 45 and 60 degrees, and the compression of the decompression sealing ring 9 is between 30 and 40 percent.
In order to facilitate the installation of the diaphragm 4, a sealing groove 1b for installing the diaphragm 4 is arranged on the valve body 1, and the sealing groove 1b is arranged outside the lower part of the bottom section e. In order to ensure the sealing effect of the decompression cavity, a membrane sealing ring 10 is arranged between the inner side of the membrane 4 and the valve body 1.
Claims (4)
1. The utility model provides a seal structure for valve rod in relief pressure valve, the relief pressure valve includes valve body (1), be provided with decompression chamber (1a) in valve body (1), be provided with pressure relief device in decompression chamber (1a), pressure relief device includes valve rod (2), disk seat (3), diaphragm (4) and case (5), its characterized in that: the pressure reducing cavity (1a) comprises a top section (a), a sealing section (b), a pressure reducing section (c), a valve seat section (d) and a bottom section (e) which are sequentially arranged from top to bottom, the diameters of the top section (a), the sealing section (b), the pressure reducing section (c), the valve seat section (d) and the bottom section (e) are gradually increased from small to large, the diaphragm (4) is arranged below the bottom section (e), a sealing assembly, a spring supporting cover (6), a reset spring (7) and a valve seat (3) are sequentially sleeved outside the valve rod (2) from top to bottom, the sealing assembly is located in the sealing section (b), the spring supporting cover (6) and the reset spring (7) are both located in the pressure reducing section (c), the valve seat (3) is both located in the valve seat section (d), and a valve core (5) is arranged between the valve seat (3) and the valve seat section (d); the valve rod (2) comprises an upper section (2a) and a lower section (2b) which are sequentially arranged from top to bottom, the diameter of the upper section (2a) is larger than that of the lower section (2b), a valve rod inclined plane (2c) is arranged between the upper section (2a) and the lower section (2b), circular arc transition is adopted between the valve rod inclined plane (2c) and the upper section (2a), between the valve rod inclined plane (2c) and the lower section (2b), the upper end of the inner side of the valve core (5) is set to be a circular arc surface (5a), the inner side of the upper end of the valve seat (3) is set to be a valve seat conical surface (3a), a first sealing surface is formed between the circular arc surface and the valve rod inclined plane (2c), and a second sealing surface is formed between the valve seat conical surface (3a) and the circular arc transition surface between the upper section (2a) and the valve rod inclined plane (2 c).
2. A sealing structure for a valve stem in a pressure reducing valve according to claim 1, wherein: the sealing assembly comprises a conical ring (8) and a decompression sealing ring (9) which are sequentially arranged from top to bottom, a sealing inclined plane (f) is arranged between a sealing section (b) and a top section (a), and the upper end surface of the conical ring (8) is a sealing conical surface (8a) which is matched with the sealing inclined plane (f).
3. A sealing structure for a valve stem in a pressure reducing valve according to claim 2, wherein: the angle between the sealing conical surface (8a) and the axis of the conical ring (8) is 45-60 degrees, and the compression amount of the decompression sealing ring (9) is 30-40 percent.
4. A sealing structure for a valve stem in a pressure reducing valve according to claim 1, wherein: be provided with seal groove (1b) that is used for installing diaphragm (4) on valve body (1), seal groove (1b) sets up outside bottom segment (e) below, be provided with diaphragm sealing washer (10) between diaphragm (4) inboard and valve body (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122687207.9U CN216112376U (en) | 2021-11-04 | 2021-11-04 | Sealing structure for valve rod in pressure reducing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122687207.9U CN216112376U (en) | 2021-11-04 | 2021-11-04 | Sealing structure for valve rod in pressure reducing valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216112376U true CN216112376U (en) | 2022-03-22 |
Family
ID=80713143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122687207.9U Active CN216112376U (en) | 2021-11-04 | 2021-11-04 | Sealing structure for valve rod in pressure reducing valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216112376U (en) |
-
2021
- 2021-11-04 CN CN202122687207.9U patent/CN216112376U/en active Active
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