CN212360178U - Cam type gas circulating pump for fuel cell - Google Patents
Cam type gas circulating pump for fuel cell Download PDFInfo
- Publication number
- CN212360178U CN212360178U CN202022129021.7U CN202022129021U CN212360178U CN 212360178 U CN212360178 U CN 212360178U CN 202022129021 U CN202022129021 U CN 202022129021U CN 212360178 U CN212360178 U CN 212360178U
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- China
- Prior art keywords
- driven shaft
- driving shaft
- shaft bearing
- cover
- bearing
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- Expired - Fee Related
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 27
- 210000004907 gland Anatomy 0.000 claims description 24
- 238000007789 sealing Methods 0.000 claims description 15
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 22
- 239000007789 gas Substances 0.000 description 17
- 239000001257 hydrogen Substances 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 238000005461 lubrication Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010517 secondary reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model discloses a cam-type gas circulation pump for fuel cell, including the pump body, drive shaft subassembly, driven shaft subassembly and seal assembly. Compared with the prior art, the gas circulating pump adopts the multi-blade spiral cam rotor with higher volumetric efficiency, the rotor and the shaft are integrally manufactured, the gear box is arranged in the pump body, the overall structure is small, the equipment efficiency is high, and the noise is low.
Description
Technical Field
The utility model relates to a gas circulation pump technical field especially relates to a cam-type gas circulation pump for fuel cell.
Background
The fuel cell gas circulation pump is one of the important equipments outside the fuel cell stack, and is the core part of the fuel cell gas supply system. The oil-free lubrication type electric reactor not only needs to meet the configuration requirement of oil-free lubrication, but also puts strict requirements on weight, volume, power consumption, noise and dynamic response to parameter change of the electric reactor. When the fuel cell stack reacts, hydrogen can not be fully utilized, not only can energy waste and air pollution be caused by direct discharge, but also the hydrogen is very easy to explode and has danger. The hydrogen circulating pump can effectively pressurize and recycle the hydrogen, and then the hydrogen enters the fuel cell stack to carry out secondary reaction, thereby improving the power density and efficiency of the fuel cell.
In the existing gas circulation pump, a pressurizing cavity shell and a gear box are of a split assembly type structure, a rotor is circumferentially and fixedly installed on a rotating shaft through a key groove, and the rotating shaft drives the rotor to rotate at a high speed. The structure has the problems of large pump size, high assembly difficulty, high noise and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a cam-type gas circulation pump for fuel cell for it is big to solve current gas circulation pump occupation space, and assembly efficiency is low, the big scheduling problem of noise.
In order to achieve the above object, the utility model provides a following scheme:
the utility model discloses a cam-type gas circulation pump for fuel cell, include:
the pump body comprises a shell, a pump cover and a gearbox cover, wherein the pump cover and the gearbox cover are respectively fixed at two ends of the shell, a pressurizing cavity adjacent to the pump cover and a gearbox cavity adjacent to the gearbox cover are arranged in the shell, an air inlet and an air outlet are respectively arranged at two sides of the shell, the air inlet and the air outlet both correspond to the pressurizing cavity, and an oil filling port is arranged at a position on the shell corresponding to the gearbox cavity;
the driving shaft assembly comprises a driving shaft, a driving shaft bearing, a driving shaft rotor and a driving shaft gear, the driving shaft rotor is located in the pressurization cavity and is integrally connected with the driving shaft, the driving shaft gear is located in the gear box cavity and is fixedly connected with the driving shaft, the driving shaft is rotatably connected with the pump body through the driving shaft bearing, and the driving shaft penetrates through the gear box cover;
the driven shaft assembly comprises a driven shaft, a driven shaft bearing, a driven shaft rotor and a driven shaft gear, the driven shaft rotor is located in the pressurization cavity and is integrally connected with the driven shaft, the driven shaft rotor is meshed with the driving shaft rotor, the driven shaft gear is located in the gear box cavity and is fixedly connected with the driven shaft, the driving shaft gear is meshed with the driven shaft gear, and the driven shaft is rotatably connected with the pump body through the driven shaft bearing;
and the sealing assembly enables the pressurizing cavity and the gear box cavity to be in a closed state, and the interior of the pump body can be communicated with the outside only through the air inlet, the air outlet and the oil injection port.
Preferably, the driving shaft bearing comprises a first driving shaft bearing and a second driving shaft bearing, the first driving shaft bearing is installed on the pump cover and is rotatably connected with one end of the driving shaft, and the second driving shaft bearing is installed on the pressurizing cavity and between the gear box cavity on the shell and is rotatably connected with the middle of the driving shaft.
Preferably, the first driving shaft bearing is a deep groove ball bearing, and the second driving shaft bearing comprises two angular contact ball bearings arranged side by side.
Preferably, the second driving shaft bearing close to the pressurizing cavity is in axial contact with the stepped structure on the shell and is limited, the second driving shaft bearing close to the gear box cavity is in contact with the driving shaft bearing gland for limitation, the driving shaft bearing gland is located in the gear box cavity, the driving shaft penetrates through the driving shaft bearing gland, and the driving shaft bearing gland is fixed on the shell.
Preferably, the seal assembly includes a driving shaft oil seal, the driving shaft oil seal is disposed on the driving shaft, and the driving shaft oil seal is respectively located between the first driving shaft bearing and the driving shaft rotor, between the driving shaft rotor and the second driving shaft bearing, and outside the gear box cover.
Preferably, the driven shaft bearing includes a first driven shaft bearing and a second driven shaft bearing, the first driven shaft bearing is installed on the pump cover and is connected with one end of the driven shaft in a rotating manner, and the second driven shaft bearing is installed on the casing between the pressurization cavity and the gear box cavity and is connected with the middle part of the driven shaft in a rotating manner.
Preferably, the first driven shaft bearing is a deep groove ball bearing, and the second driven shaft bearing comprises two angular contact ball bearings arranged side by side.
Preferably, be close to the pressure boost chamber the second driven shaft bearing with stair structure on the casing is spacing in axial contact, be close to the gear box chamber the second driven shaft bearing is spacing with driven shaft bearing gland contact, driven shaft bearing gland is located the gear box intracavity, the driven shaft passes driven shaft bearing gland, driven shaft bearing gland is fixed in on the casing.
Preferably, the sealing assembly includes a driven shaft oil seal, the driven shaft oil seal is disposed on the driven shaft, and the driven shaft oil seal is respectively located between the first driven shaft bearing and the driven shaft rotor and between the driven shaft rotor and the second driven shaft bearing.
Preferably, the sealing assembly comprises a pump cover sealing ring and a gearbox cover sealing ring, the pump cover sealing ring is arranged between the pump cover and the shell, and the gearbox cover sealing ring is arranged between the gearbox cover and the shell.
The utility model discloses for prior art gain following technological effect:
1. the pressurizing cavity and the gear box cavity are arranged in the shell, and a split assembly type structure is not needed, so that the volume of the gas circulating pump is effectively reduced, the installation space is saved, and the weight of the pump is reduced;
2. the rotor and the shaft are integrally manufactured, so that the problem that the rotor and the shaft are difficult to install is solved, the assembly efficiency is greatly improved, the problem that the rotor section has large leakage due to large assembly deviation caused by large errors caused by the separate processing and manufacturing of the rotor and the shaft is also effectively solved, and the sealing performance of the pump is improved;
3. the rotor and the shaft are integrally manufactured, the shaft can better bear the radial force of the rotor, and the problem that the rotor is connected through a key groove and is displaced when rotating at a high speed, so that the rotor is rubbed with the section of the pressurizing cavity to cause larger noise is effectively solved;
4. the bearing gland locks the shaft in the pump body, and the noise caused by bearing looseness in high-speed rotation of the shaft is effectively avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view showing the internal structure of a cam type gas circulation pump for a fuel cell according to the present embodiment;
fig. 2 is a schematic view showing the external configuration of the cam type gas circulation pump for a fuel cell of the present embodiment;
fig. 3 is a plan view of the cam type gas circulation pump for a fuel cell of the present embodiment;
FIG. 4 is a schematic view of an integrated structure of a driving shaft and a driving shaft rotor;
FIG. 5 is a schematic view of an integrated structure of a driven shaft and a driven shaft rotor;
description of reference numerals: 1-driving shaft; 2-a flat bond; 3-driving shaft oil seal; 4-gearbox cover; 5-expanding and tightening the sleeve; 6-driven shaft; 7-a screw; 8-a synchronizing gear; 9-gearbox chamber; 10-gearbox cover sealing ring; 11-an oil filling port; 12-a pump body; 13-a locking nut; 14-driven shaft bearing gland; 15-locking screws; 16-angular contact ball bearings; 17-driven shaft oil seal; 18-a housing; 19-pump cover sealing ring; 20-pump cover; 21-deep groove ball bearing; 22-a drive shaft rotor; 23-a pressurizing cavity; 24 an exhaust port; 25-air inlet.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model aims at providing a cam-type gas circulation pump for fuel cell for it is big to solve current gas circulation pump and possess the space, changes to join in marriage inefficiency, the big scheduling problem of noise.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
As shown in fig. 1 to 5, the present embodiment provides a cam type gas circulation pump for a fuel cell, which includes a pump body 12, a driving shaft assembly, a driven shaft assembly, and a seal assembly.
The pump body 12 includes a housing 18, a pump cover 20, and a gearbox cover 4, where the pump cover 20 and the gearbox cover 4 are respectively fixed at two ends of the housing 18. In this embodiment, the pump cover 20 and the gear box cover 4 are fixed to the housing 18 by screws 7, respectively. A pressurizing cavity 23 adjacent to the pump cover 20 and a gearbox cavity 9 adjacent to the gearbox cover 4 are arranged in the shell 18, an air inlet 25 and an air outlet 24 are respectively arranged on two sides of the shell 18, and the air inlet 25 and the air outlet 24 both correspond to the pressurizing cavity 23. An oil filling port 11 is formed in the position, corresponding to the position of the gear box cavity 9, of the shell 18, so that lubricating oil can be conveniently added into the gear box cavity 9. The driving shaft assembly comprises a driving shaft 1, a driving shaft bearing, a driving shaft rotor 22 and a driving shaft gear. The driving shaft rotor 22 is located in the pressurizing cavity 23 and integrally connected with the driving shaft 1, the driving shaft gear is located in the gearbox cavity 9 and fixedly connected with the driving shaft 1, the driving shaft 1 is rotatably connected with the pump body 12 through a driving shaft bearing, and the driving shaft 1 penetrates through the gearbox cover 4. The driven shaft assembly comprises a driven shaft 6, a driven shaft bearing, a driven shaft rotor and a driven shaft gear. The driven shaft rotor is located in the pressurizing cavity 23 and is integrally connected with the driven shaft 6, and the driven shaft rotor is meshed with the driving shaft rotor 22. In this embodiment, a gap of 0.1mm is provided between the driving shaft rotor 22 and the driven shaft rotor and the pressurizing cavity 23, and a gap of 0.15mm is provided between the driving shaft rotor 22 and the driven shaft rotor. The driven shaft gear is positioned in the gear box cavity 9 and is fixedly connected with the driven shaft 6, the driving shaft gear is meshed with the driven shaft gear, and the driving shaft gear and the driven shaft gear are synchronous gears 8. The driven shaft 6 is rotatably connected with the pump body 12 through a driven shaft bearing. The seal assembly seals the pressurizing chamber 23 and the gear box chamber 9, and the interior of the pump body 12 can communicate with the outside only through the intake port 25, the exhaust port 24, and the oil filler port 11.
When the gas circulating pump is used, the driving shaft is driven to rotate through the external driving mechanism, and the driving shaft drives the driven shaft to rotate due to the fact that the driving shaft gear is meshed with the driven shaft gear. As the driven shaft rotor is engaged with the drive shaft rotor 22, a high pressure region and a low pressure region are formed in the pressure increasing chamber 23 when the driven shaft rotor and the drive shaft rotor 22 rotate. The air inlet 25 is positioned in a low-pressure area, the air outlet 24 is positioned in a high-pressure area, and air enters the pressurizing cavity 23 from the air inlet 25, is pressurized and then is discharged from the air outlet 24.
Specifically, the driving shaft rotor 22 and the driven shaft rotor are both multi-lobe spiral cam rotors, and the profile of the driving shaft rotor 22 and the profile of the driven shaft rotor are formed by an arc-involute-arc and are meshed with each other. The helix angle of the driving shaft rotor 22 and the driven shaft rotor is 0-120 degrees, and the number of rotor blades is 4-6.
In order to facilitate the transmission connection with an external driving mechanism, a flat key 2 is fixed at one end of the driving shaft 1 extending out of the gearbox cover 4 in the embodiment. In order to fix the driving shaft gear and the driven shaft gear conveniently, the driving shaft gear and the driven shaft gear are fixed on the driving shaft 1 and the driven shaft 6 respectively through the expansion sleeve 5 in the embodiment.
In this embodiment, the driving shaft bearing includes a first driving shaft bearing and a second driving shaft bearing, the first driving shaft bearing is installed on the pump cover 20 and rotatably connected with one end of the driving shaft 1, and the second driving shaft bearing is installed on the housing 18 between the pressurizing cavity 23 and the gear box cavity 9 and rotatably connected with the middle portion of the driving shaft 1.
The driven shaft bearing comprises a first driven shaft bearing and a second driven shaft bearing, the first driven shaft bearing is installed on the pump cover 20 and is rotatably connected with one end of the driven shaft 6, and the second driven shaft bearing is installed on the shell 18 between the pressurization cavity 23 and the gearbox cavity 9 and is rotatably connected with the middle of the driven shaft 6.
Specifically, the first drive shaft bearing is a deep groove ball bearing 21, and the second drive shaft bearing includes two angular contact ball bearings 16 arranged side by side. The second driving shaft bearing close to the pressurizing cavity 23 is axially contacted and limited with a stepped structure on the shell 18, the second driving shaft bearing close to the gearbox cavity 9 is contacted and limited with a driving shaft bearing gland, the driving shaft bearing gland is positioned in the gearbox cavity 9, the driving shaft 1 penetrates through the driving shaft bearing gland, and the driving shaft bearing gland is fixed on the shell 18 through a fastening piece. In this embodiment, the driving shaft bearing pressing cover is fixed on the housing 18 through the locking screw 15 and the locking nut 13, one end of the locking screw 15 penetrates through the driving shaft bearing pressing cover and is in threaded connection with the housing 18, and the other end of the locking screw 15 is in threaded connection with the locking nut 13.
The first output shaft bearing is a deep groove ball bearing 21, and the second output shaft bearing comprises two angular contact ball bearings 16 arranged side by side. The second driven shaft bearing close to the pressurizing cavity 23 is axially contacted and limited with the stepped structure on the shell 18, the second driven shaft bearing close to the gearbox cavity 9 is contacted and limited with the driven shaft bearing gland 14, the driven shaft bearing gland 14 is positioned in the gearbox cavity 9, the driven shaft 6 penetrates through the driven shaft bearing gland 14, and the driven shaft bearing gland 14 is fixed on the shell 18 through a fastener. In this embodiment, the driven shaft bearing gland 14 is fixed to the housing 18 through the locking screw 15 and the locking nut 13, one end of the locking screw 15 penetrates through the driven shaft bearing gland 14 and is in threaded connection with the housing 18, and the other end of the locking screw 15 is in threaded connection with the locking nut 13.
The deep groove ball bearing 21 and the angular contact ball bearing 16 receive the axial force and the radial force of the driving shaft 1 and the driven shaft 6, and improve the fluency of the rotation of the driving shaft 1 and the driven shaft 6.
More specifically, the seal assembly includes a drive shaft oil seal 3, a driven shaft oil seal 17, a pump cover seal ring 19, and a gearbox cover seal ring 10. The driving shaft oil seal 3 is sleeved on the driving shaft 1, and the driving shaft oil seal 3 is respectively positioned between a first driving shaft bearing and a driving shaft rotor 22, between the driving shaft rotor 22 and a second driving shaft bearing and outside a gear box cover 4. The driven shaft oil seal 17 is sleeved on the driven shaft 6, and the driven shaft oil seal 17 is respectively positioned between the first driven shaft bearing and the driven shaft rotor and between the driven shaft rotor and the second driven shaft bearing. The driving shaft oil seal 3 and the driven shaft oil seal 17 can ensure that the pressurizing cavity 23 and the gear box cavity 9 are in a closed state, and the interior of the pump body 12 can be communicated with the outside only through the air inlet 25, the air outlet 24 and the oil injection port 11. Pump cover sealing ring 19 is located between pump cover 20 and casing 18, and gearbox cover sealing ring 10 is located between gearbox cover 4 and casing 18, and pump cover sealing ring 19 and gearbox cover sealing ring 10 are O type circle.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (10)
1. A cam-type gas circulation pump for a fuel cell, comprising:
the pump body comprises a shell, a pump cover and a gearbox cover, wherein the pump cover and the gearbox cover are respectively fixed at two ends of the shell, a pressurizing cavity adjacent to the pump cover and a gearbox cavity adjacent to the gearbox cover are arranged in the shell, an air inlet and an air outlet are respectively arranged at two sides of the shell, the air inlet and the air outlet both correspond to the pressurizing cavity, and an oil filling port is arranged at a position on the shell corresponding to the gearbox cavity;
the driving shaft assembly comprises a driving shaft, a driving shaft bearing, a driving shaft rotor and a driving shaft gear, the driving shaft rotor is located in the pressurization cavity and is integrally connected with the driving shaft, the driving shaft gear is located in the gear box cavity and is fixedly connected with the driving shaft, the driving shaft is rotatably connected with the pump body through the driving shaft bearing, and the driving shaft penetrates through the gear box cover;
the driven shaft assembly comprises a driven shaft, a driven shaft bearing, a driven shaft rotor and a driven shaft gear, the driven shaft rotor is located in the pressurization cavity and is integrally connected with the driven shaft, the driven shaft rotor is meshed with the driving shaft rotor, the driven shaft gear is located in the gear box cavity and is fixedly connected with the driven shaft, the driving shaft gear is meshed with the driven shaft gear, and the driven shaft is rotatably connected with the pump body through the driven shaft bearing;
and the sealing assembly enables the pressurizing cavity and the gear box cavity to be in a closed state, and the interior of the pump body can be communicated with the outside only through the air inlet, the air outlet and the oil injection port.
2. The cam-type gas circulation pump for a fuel cell according to claim 1, wherein the driving shaft bearing includes a first driving shaft bearing installed on the pump cover and rotatably connected with one end of the driving shaft, and a second driving shaft bearing installed on the housing between the pressurizing chamber and the gear box chamber and rotatably connected with a middle portion of the driving shaft.
3. The cam-type gas circulation pump for a fuel cell according to claim 2, wherein the first driving shaft bearing is one deep groove ball bearing, and the second driving shaft bearing includes two angular contact ball bearings arranged side by side.
4. The cam-type gas circulation pump for a fuel cell according to claim 3, wherein the second driving shaft bearing near the pressurizing chamber is axially contacted and limited with a stepped structure on the housing, the second driving shaft bearing near the gear box chamber is contacted and limited with a driving shaft bearing gland, the driving shaft bearing gland is located in the gear box chamber, the driving shaft passes through the driving shaft bearing gland, and the driving shaft bearing gland is fixed on the housing.
5. The cam-type gas circulation pump for a fuel cell according to claim 4, wherein the seal assembly includes a drive shaft oil seal that is enclosed on the drive shaft, the drive shaft oil seal being respectively located between the first drive shaft bearing and the drive shaft rotor, between the drive shaft rotor and the second drive shaft bearing, and outside the gear box cover.
6. The cam-type gas circulation pump for a fuel cell according to claim 1, wherein the driven shaft bearing includes a first driven shaft bearing mounted on the pump cover and rotatably connected to one end of the driven shaft, and a second driven shaft bearing mounted on the housing between the pressurizing chamber and the gear box chamber and rotatably connected to a middle portion of the driven shaft.
7. The cam-type gas circulation pump for a fuel cell according to claim 6, wherein the first driven shaft bearing is a deep groove ball bearing, and the second driven shaft bearing includes two angular contact ball bearings arranged side by side.
8. The cam-type gas circulation pump for a fuel cell according to claim 7, wherein the second driven shaft bearing adjacent to the pressurizing chamber is axially contact-limited with a stepped structure on the housing, and the second driven shaft bearing adjacent to the gear box chamber is contact-limited with a driven shaft bearing cover, the driven shaft bearing cover being located in the gear box chamber, the driven shaft passing through the driven shaft bearing cover, the driven shaft bearing cover being fixed to the housing.
9. The cam-type gas circulation pump for a fuel cell according to claim 8, wherein the seal assembly includes a driven shaft oil seal that is sealed around the driven shaft, the driven shaft oil seal being located between the first driven shaft bearing and the driven shaft rotor and between the driven shaft rotor and the second driven shaft bearing, respectively.
10. The cam-type gas circulation pump for a fuel cell according to claim 1, wherein the seal assembly includes a pump cover seal ring and a gearbox cover seal ring, the pump cover seal ring is provided between the pump cover and the casing, and the gearbox cover seal ring is provided between the gearbox cover and the casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022129021.7U CN212360178U (en) | 2020-09-25 | 2020-09-25 | Cam type gas circulating pump for fuel cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022129021.7U CN212360178U (en) | 2020-09-25 | 2020-09-25 | Cam type gas circulating pump for fuel cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212360178U true CN212360178U (en) | 2021-01-15 |
Family
ID=74143423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022129021.7U Expired - Fee Related CN212360178U (en) | 2020-09-25 | 2020-09-25 | Cam type gas circulating pump for fuel cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212360178U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111997897A (en) * | 2020-09-25 | 2020-11-27 | 兰州理工大学 | Cam type gas circulating pump for fuel cell |
-
2020
- 2020-09-25 CN CN202022129021.7U patent/CN212360178U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111997897A (en) * | 2020-09-25 | 2020-11-27 | 兰州理工大学 | Cam type gas circulating pump for fuel cell |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210115 |
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| CF01 | Termination of patent right due to non-payment of annual fee |