CN222254333U - Sealing structure of hydrogen circulating pump - Google Patents
Sealing structure of hydrogen circulating pump Download PDFInfo
- Publication number
- CN222254333U CN222254333U CN202420924189.2U CN202420924189U CN222254333U CN 222254333 U CN222254333 U CN 222254333U CN 202420924189 U CN202420924189 U CN 202420924189U CN 222254333 U CN222254333 U CN 222254333U
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- China
- Prior art keywords
- oil
- seal
- cavity
- sealing
- ring
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- 238000007789 sealing Methods 0.000 title claims abstract description 119
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 60
- 239000001257 hydrogen Substances 0.000 title claims abstract description 60
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 230000006835 compression Effects 0.000 claims abstract description 48
- 238000007906 compression Methods 0.000 claims abstract description 48
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 12
- 125000006850 spacer group Chemical group 0.000 claims description 10
- 238000002485 combustion reaction Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 81
- 239000010687 lubricating oil Substances 0.000 description 15
- 230000000694 effects Effects 0.000 description 7
- 238000005192 partition Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 5
- 238000005461 lubrication Methods 0.000 description 5
- 239000000446 fuel Substances 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Landscapes
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The utility model relates to the field of sealing structures, in particular to a sealing structure of a hydrogen circulating pump, which comprises a fixed ring, a first sealing element, a second sealing element and an oil seal, wherein the fixed ring is arranged at a part, positioned between an oil cavity and a compression cavity, in a shell, the first sealing element is arranged at one side, close to the compression cavity, of the fixed ring, the first sealing element comprises a plurality of annular sealing teeth facing a rotor shaft, the fixed ring is provided with the oil seal and the second sealing element, the oil seal is close to the oil cavity, and the second sealing element is close to the compression cavity. The design ensures good sealing of the oil cavity and the compression cavity while keeping the parts such as the rotor shaft and the like in the shell fully lubricated and the efficient combustion of hydrogen in the compression cavity, thereby realizing efficient and safe operation of the hydrogen circulating pump.
Description
Technical Field
The utility model relates to the field of sealing structures, in particular to a sealing structure of a hydrogen circulating pump.
Background
The hydrogen circulating pump is applied to a hydrogen fuel cell system, and the residual hydrogen which is used for the internal reference of the system and the chemical reaction is recycled. The hydrogen fuel cell system requires the purity of the hydrogen to reach a certain standard, because the content of sulfur, carbon, ammonia and other impurities in the hydrogen has a significant effect on the proton exchange membrane and the catalyst of the fuel cell, thereby possibly shortening the service life of the fuel cell. In the traditional hydrogen circulating pump, one end of the inner rotor shaft is matched with the oil cavity, and the other end of the inner rotor shaft is matched with the compression cavity, so that the oil cavity and the compression cavity are respectively sealed in a gas seal and seal mode. However, the hydrogen is easy to leak, and when the hydrogen leaks into the environment, dangerous factors can be caused, so that the single-stage gas seal and seal still have the risk that the hydrogen leaks or lubricating oil in the oil cavity leaks into the compression cavity to influence the purity of the hydrogen.
Disclosure of utility model
The utility model aims to solve the technical problem of providing a sealing structure of a hydrogen circulating pump, which adopts a multistage sealing design and can ensure good sealing and hydrogen purity.
In order to solve the technical problems, the technical scheme includes that the sealing structure of the hydrogen circulating pump is arranged in a shell of the hydrogen circulating pump, an oil cavity is formed in one side of the shell, a compression cavity is formed in the other side of the shell, a rotor shaft is arranged in the shell and comprises a fixed ring, a first sealing piece, a second sealing piece and an oil seal, the fixed ring is arranged in the shell and positioned between the oil cavity and the compression cavity, the first sealing piece is arranged on one side, close to the compression cavity, of the fixed ring, the first sealing piece comprises a plurality of annular sealing teeth facing the rotor shaft, an oil seal and the second sealing piece are arranged on the fixed ring, the oil seal is close to the oil cavity, and the second sealing piece is close to the compression cavity.
Further, the fixing ring comprises a third sealing element, and the side, adjacent to the shell, of the fixing ring is provided with the third sealing element.
Further, the device also comprises a fourth sealing element, and the fourth sealing element is arranged on one side of the first sealing element adjacent to the shell.
Further, the sealing device also comprises a spacer ring, wherein the spacer ring is arranged on the fixed ring, and the spacer ring is arranged between the second sealing element and the oil seal.
Further, through holes are formed in the fixing ring and the partition ring, a discharge hole is formed in the shell, one end of the discharge hole is communicated with the through holes of the fixing ring and the partition ring, and the other end of the discharge hole is communicated with an external pipeline.
The oil cavity is arranged on one side of the fixed ring, which is adjacent to the oil cavity, the adjusting ring and the bearing are sequentially arranged on one side of the fixed ring, which is adjacent to the oil cavity, the bearing gap is communicated with the gear cavity, a through hole is formed in the adjusting ring, an oil return hole is formed in the shell, one end of the oil return hole is communicated with the through hole in the adjusting ring, and the other end of the oil return hole is communicated with the gear cavity.
Further, sealing elements are arranged at the parts, adjacent to the shell, of the two sides of the fixed ring, corresponding to the discharge holes.
Further, the anti-rotation device also comprises a first anti-rotation pin, and the first anti-rotation pin is connected with the fixing ring and the shell.
Further, a second anti-rotation pin is also included, connecting the retaining ring with the first seal.
Further, the second sealing element and the oil seal are single-lip sealing elements, the lip portion of the second sealing element faces one side of the compression cavity, and the lip portion of the oil seal faces one side of the oil cavity.
The utility model has the advantages that the multistage seal of hydrogen in the compression cavity is formed by the second sealing element and the first sealing element on the fixed ring, the labyrinth seal is formed by combining the design of the annular sealing teeth of the first sealing element, a series of intercepting gaps and expansion cavities can be formed between the teeth, the hydrogen in the compression cavity can generate throttling effect when passing through the gaps of the labyrinth, thus preventing the hydrogen in the compression cavity from flowing to the outside, meanwhile, the sealing mode is suitable for occasions with high temperature, high pressure and high rotating speed because the gap exists between the first sealing element and the rotor shaft, lubrication is not needed, and thermal expansion is allowed, the lubricating oil in the oil cavity is sealed by the oil seal on the fixed ring, and the good seal of the oil cavity and the compression cavity is ensured while the parts such as the rotor shaft in the shell are fully lubricated and the hydrogen in the compression cavity is combusted efficiently, so that the efficient and safe operation of the hydrogen circulating pump is realized.
Drawings
Fig. 1 is a schematic structural view of a sealing structure of a hydrogen circulation pump according to an embodiment of the present utility model.
Description of the reference numerals:
1. The sealing device comprises a first sealing element, a second sealing element, a third sealing element, a fourth sealing element, a second anti-rotation pin, a fourth sealing element, a second sealing element, a rotor shaft, a 6, a fixed ring, a 7, a spacer ring, an 8, an oil seal, a 9, an oil return hole, a 10, a gasket, an 11, a first fastening element, a 12, a gear, a 13, a gear cavity, a 14, a second fastening element, a 15, a baffle plate, a 16, a shell, a 17, a bearing, an 18, an adjusting ring, a 19, a discharge hole, a 20, a fifth sealing element, a 21, a third sealing element, a 22 and a first anti-rotation pin.
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present utility model in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
Referring to fig. 1, a sealing structure of a hydrogen circulating pump is provided in a casing 16 of the hydrogen circulating pump, wherein one side in the casing 16 is an oil cavity, the other side is a compression cavity, and a rotor shaft 5 is provided in the casing 16, and the sealing structure is characterized by comprising a fixing ring 6, a first sealing member 1, a second sealing member 4 and an oil seal 8, wherein the fixing ring 6 is provided in a part between the oil cavity and the compression cavity in the casing 16, the fixing ring 6 is provided with the first sealing member 1 on one side close to the compression cavity, the first sealing member 1 comprises a plurality of annular sealing teeth facing the rotor shaft 5, the fixing ring 6 is provided with the oil seal 8 and the second sealing member 4, the oil seal 8 is close to the oil cavity, and the second sealing member 4 is close to the compression cavity.
From the above description, the utility model has the advantages that the second sealing element 4 on the fixed ring 6 and the first sealing element 1 form multistage sealing on hydrogen in the compression cavity, simultaneously, the annular sealing teeth of the first sealing element 1 are combined to form labyrinth sealing, a series of interception gaps and expansion cavities can be formed between the teeth, the hydrogen in the compression cavity generates throttling effect when passing through the gaps of the tortuous labyrinth, thus preventing the hydrogen in the compression cavity from flowing to the outside, meanwhile, the first sealing element 1 and the rotor shaft 5 have no contact, do not need lubrication and allow thermal expansion, the sealing form is suitable for occasions with high temperature, high pressure and high rotating speed, the oil seal 8 on the fixed ring 6 seals the lubricating oil of the oil cavity, and the design ensures good sealing of the oil cavity and the compression cavity while keeping the components such as the rotor shaft 5 and the like in the shell 16 sufficiently lubricate and the efficient combustion of the hydrogen in the compression cavity, thus realizing the efficient and safe operation of the hydrogen circulating pump.
Further, a third sealing member 21 is further included, and a third sealing member 21 is disposed on a side of the fixing ring 6 adjacent to the housing 16.
As is apparent from the above description, leakage of lubricating oil or hydrogen at the contact surface between the stationary ring 6 and the housing 16 is prevented by the design of the third seal 21.
Further, a fourth sealing member 2 is further included, and a fourth sealing member 2 is disposed on a side of the first sealing member 1 adjacent to the housing 16.
As is apparent from the above description, the leakage of hydrogen gas along the interface between the first seal member 1 and the housing 16 is prevented by the design of the fourth seal member 2.
Further, the sealing device also comprises a spacing ring 7, wherein the spacing ring 7 is arranged on the fixed ring 6, and the spacing ring 7 is arranged between the second sealing element 4 and the oil seal 8.
As is apparent from the above description, the second seal 4 and the oil seal 8 are partitioned by the spacer ring 7.
Further, through holes are formed in the fixing ring 6 and the partition ring 7, a discharge hole 19 is formed in the shell 16, one end of the discharge hole 19 is communicated with the through holes of the fixing ring 6 and the partition ring 7, and the other end of the discharge hole is communicated with an external pipeline.
As is apparent from the above description, in order to prevent leakage caused by failure of the gas seal and the oil seal 8 after long-term operation, by the communication design between the discharge hole 19 of the housing 16 and the through holes of the fixed ring 6 and the partition ring 7, the leaked lubricating oil or hydrogen gas can not enter the compression chamber or the oil chamber, but flow into the discharge hole 19 through the through holes of the partition ring 7 and the fixed ring 6, and then be recycled through the external pipeline connected with the discharge hole 19.
The oil cavity of the shell 16 is provided with a bearing 17 and an adjusting ring 18, one side adjacent to the oil cavity in the shell 16 is provided with a gear cavity 13, one side, close to the oil cavity, of the fixed ring 6 is provided with the adjusting ring 18 and the bearing 17 in sequence, the gap between the bearing 17 and the gear cavity 13 is communicated, the adjusting ring 18 is provided with a through hole, the shell 16 is provided with an oil return hole 9, one end of the oil return hole 9 is communicated with the through hole on the adjusting ring 18, and the other end of the oil return hole 9 is communicated with the gear cavity 13.
The bearing 17 is matched with the rotor shaft 5 and is lubricated by lubricating oil, the lubricating oil in the gear cavity 13 can enter the oil cavity to lubricate the rotor shaft 5 and the oil seal 8 through the clearance communication between the gear cavity 13 and the bearing 17, the situation that the clearance is increased due to insufficient abrasion of lubrication between the oil seal 8 and the rotor shaft 5 rotating at a high speed is avoided, the oil seal 8 can be cooled, the sealing effect of the oil seal 8 is ensured, the service life of the oil seal 8 is prolonged, and then the lubricating oil flows into the oil return hole 9 through the through hole of the adjusting ring 18 and flows back to the gear cavity 13 again, so that the risk of lubricating oil leakage is avoided.
Further, the parts of the fixing ring 6 adjacent to the housing 16 at both sides of the discharge hole 19 are provided with sealing members.
As is apparent from the above description, by designing the seal members at the portions adjacent to the housing 16 on both sides of the fixing ring 6, leakage of hydrogen gas and lubricating oil from the contact surface between the fixing ring 6 and the housing 16 can be prevented, respectively.
Further, a first anti-rotation pin 22 is also included, the first anti-rotation pin 22 connecting the fixing ring 6 with the housing 16.
As is clear from the above description, the fixing ring 6 and the housing 16 can be fixed from relative rotation by the arrangement of the first rotation preventing pin 22.
Further, a second anti-rotation pin 3 is included, the second anti-rotation pin 3 connects the fixing ring 6 with the first seal 1.
As is clear from the above description, the fixing ring 6 and the first seal 1 can be fixed from relative rotation by the arrangement of the second rotation preventing pin 3.
Further, the second seal 4 and the oil seal 8 are single-lip seals, the lip portion of the second seal 4 faces the compression chamber side, and the lip portion of the oil seal 8 faces the oil chamber side.
From the above description, the second sealing member 4 and the oil seal 8 are designed to be single lip sealing members, so that good sealing of lubricating oil in the oil cavity and hydrogen in the compression cavity is achieved.
Embodiment one:
The application scenario is that one end of the inner rotor shaft 5 of the traditional hydrogen circulating pump is matched with the oil cavity, and the other end of the inner rotor shaft is matched with the compression cavity, so that the oil cavity and the compression cavity are respectively sealed in a gas seal and seal mode. However, the hydrogen is easy to leak, and when the hydrogen leaks into the environment, dangerous factors can be caused, so that the single-stage gas seal and seal still have the risk that the hydrogen leaks or lubricating oil in the oil cavity leaks into the compression cavity to influence the purity of the hydrogen.
As shown in FIG. 1, the sealing structure of the hydrogen circulating pump in this embodiment is disposed in a casing 16 of the hydrogen circulating pump, an oil cavity is disposed on one side of the casing 16, a compression cavity is disposed on the other side of the casing 16, a rotor shaft 5 is disposed in the casing 16, a gear cavity 13 is disposed on one side adjacent to the oil cavity in the casing 16, a gear 12 is disposed in the gear cavity 13, one end of the rotor shaft 5 extends into the gear cavity 13 to cooperate with the gear 12, and is fixed in the gear cavity 13 through cooperation of a first fastener 11 and a gasket 10, a second fastener 14 and a baffle 15 are disposed on the casing 16 opposite to the gear 12, and a bearing 17 is disposed in a portion of the oil cavity corresponding to the rotor shaft 5.
The sealing structure comprises a fixed ring 6, a first sealing element 1, a second sealing element 4, an oil seal 8, a third sealing element 21, a fourth sealing element 2, a fifth sealing element 20, a spacer ring 7, a discharge hole 19, an adjusting ring 18, an oil return hole 9, a first anti-rotation pin 22 and a second anti-rotation pin 3.
The fixed ring 6 is arranged at a part, located between the oil cavity and the compression cavity, in the shell 16, the first anti-rotation pin 22 is connected with the fixed ring 6 and the shell 16, a first sealing piece 1 is arranged at one side, close to the compression cavity, of the fixed ring 6, the second anti-rotation pin 3 is connected with the fixed ring 6 and the first sealing piece 1, the first sealing piece 1 comprises a plurality of annular sealing teeth facing the rotor shaft 5, an oil seal 8 and a spacing ring 7 are arranged on the fixed ring 6, the second sealing piece 4 is close to the oil cavity, the second sealing piece 4 is close to the compression cavity, the spacing ring 7 is arranged between the oil seal 8 and the second sealing piece 4, the second sealing piece 4 and the oil seal 8 are single-lip sealing pieces, the lip of the second sealing piece 4 faces one side of the compression cavity, and the lip of the oil seal 8 faces one side of the oil cavity.
The fixed ring 6 and the spacing ring 7 are respectively provided with a through hole, the shell 16 is provided with a discharge hole 19, one end of the discharge hole 19 is communicated with the through holes of the fixed ring 6 and the spacing ring 7, and the other end is communicated with an external pipeline. The parts of the fixing ring 6 adjacent to the housing 16 on both sides of the discharge hole 19 are respectively provided with a third seal 21 and a fifth seal 20.
The side of the first seal 1 adjacent to the housing 16 is provided with a fourth seal 2.
An adjusting ring 18 and a bearing 17 are sequentially arranged on one side, close to the oil cavity, of the fixed ring 6, a gap between the bearing 17 and the gear cavity 13 is communicated, a through hole is formed in the adjusting ring 18, an oil return hole 9 is formed in the shell 16, one end of the oil return hole 9 is communicated with the through hole in the adjusting ring 18, and the other end of the oil return hole is communicated with the gear cavity 13.
The working principle is that on one side of the compression cavity, a seal is formed by the cooperation of the second sealing element 4 on the fixed ring 6 and the first sealing element 1. The first sealing element 1 is close to the compression cavity and is used as a front sealing element, a labyrinth sealing mode is adopted, a series of interception gaps and expansion cavities are formed between teeth by utilizing the design that annular sealing teeth are opposite to the rotor shaft 5, and the hydrogen in the compression cavity generates a throttling effect when passing through the gaps of the labyrinth, so that the hydrogen in the compression cavity is prevented from flowing to the outer side. This form of sealing is suitable for high temperature, high pressure, high rotational speed applications, since there is a gap between the first seal 1 and the rotor shaft 5, no contact, no lubrication is required, and thermal expansion is allowed.
On the oil chamber side, sealing is performed by an oil seal 8. Aiming at the lubrication of the oil seal 8, the design of the gear cavity 13, the bearing 17, the adjusting ring 18 and the oil return hole 9 is adopted, the lubricating oil flowing into the gap of the bearing 17 in the gear cavity 13 is utilized to lubricate and cool the oil seal 8, and then the lubricating oil flows back into the gear cavity 13 through the through hole of the adjusting ring 18 and the oil return hole 9.
When the air seal and the oil seal 8 fail due to long-term use, the lubricating oil or the hydrogen can be discharged out of the shell 16 for recycling through the design of the through holes of the partition ring 7 and the fixed ring 6 and the discharge hole 19, and cannot leak into the cavity on the other side.
In summary, the sealing structure of the hydrogen circulating pump provided by the utility model forms multistage sealing on hydrogen in the compression cavity through the second sealing element and the first sealing element on the fixed ring, and simultaneously forms labyrinth sealing by combining the annular sealing teeth of the first sealing element, so that a series of interception gaps and expansion cavities can be formed between the teeth, and the hydrogen in the compression cavity can generate a throttling effect when passing through the gaps of the tortuous labyrinth, thereby preventing the hydrogen in the compression cavity from flowing to the outside.
The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent changes made by the specification and drawings of the present utility model, or direct or indirect application in the relevant art, are included in the scope of the present utility model.
Claims (10)
1. The sealing structure of the hydrogen circulating pump is arranged in a shell of the hydrogen circulating pump, an oil cavity is arranged on one side in the shell, a compression cavity is arranged on the other side in the shell, and a rotor shaft is arranged in the shell; the fixed ring is provided with an oil seal and a second sealing piece, the oil seal is close to the oil cavity, and the second sealing piece is close to the compression cavity.
2. The seal structure of a hydrogen circulation pump according to claim 1, further comprising a third seal member, wherein a side of the fixing ring adjacent to the housing is provided with the third seal member.
3. The seal structure of a hydrogen circulation pump according to claim 1, further comprising a fourth seal member, wherein a side of the first seal member adjacent to the housing is provided with the fourth seal member.
4. The seal structure of a hydrogen circulation pump according to claim 1, further comprising a spacer ring provided on the fixing ring, the spacer ring being provided between the second seal member and the oil seal.
5. The seal structure of claim 4, wherein the fixing ring and the spacer ring are respectively provided with a through hole, the housing is provided with a discharge hole, one end of the discharge hole is communicated with the through holes of the fixing ring and the spacer ring, and the other end of the discharge hole is communicated with an external pipeline.
6. The sealing structure of the hydrogen circulating pump according to claim 1, further comprising a bearing and an adjusting ring, wherein a gear cavity is formed in one side, adjacent to the oil cavity, of the shell, the adjusting ring and the bearing are sequentially arranged on one side, close to the oil cavity, of the fixing ring, the bearing gap is communicated with the gear cavity, a through hole is formed in the adjusting ring, an oil return hole is formed in the shell, one end of the oil return hole is communicated with the through hole in the adjusting ring, and the other end of the oil return hole is communicated with the gear cavity.
7. The seal structure of a hydrogen circulation pump according to claim 4, wherein the portions of the fixing ring adjacent to the housing on both sides of the discharge hole are provided with sealing members.
8. The seal structure of a hydrogen circulation pump according to claim 1, further comprising a first anti-rotation pin connecting the fixing ring and the housing.
9. The seal structure of a hydrogen circulation pump according to claim 1, further comprising a second anti-rotation pin connecting the fixing ring and the first seal member.
10. The seal structure of a hydrogen circulation pump according to claim 1, wherein the second seal member and the oil seal are single-lip seal members, a lip portion of the second seal member faces a side of the compression chamber, and a lip portion of the oil seal faces a side of the oil chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420924189.2U CN222254333U (en) | 2024-04-29 | 2024-04-29 | Sealing structure of hydrogen circulating pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420924189.2U CN222254333U (en) | 2024-04-29 | 2024-04-29 | Sealing structure of hydrogen circulating pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN222254333U true CN222254333U (en) | 2024-12-27 |
Family
ID=94000531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202420924189.2U Active CN222254333U (en) | 2024-04-29 | 2024-04-29 | Sealing structure of hydrogen circulating pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN222254333U (en) |
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2024
- 2024-04-29 CN CN202420924189.2U patent/CN222254333U/en active Active
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