CN114876794A - Rotating speed self-adaptive hydrogen circulating pump - Google Patents
Rotating speed self-adaptive hydrogen circulating pump Download PDFInfo
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- CN114876794A CN114876794A CN202210461704.3A CN202210461704A CN114876794A CN 114876794 A CN114876794 A CN 114876794A CN 202210461704 A CN202210461704 A CN 202210461704A CN 114876794 A CN114876794 A CN 114876794A
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- chamber
- pressure
- pressure sensor
- air
- exhaust
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 239000001257 hydrogen Substances 0.000 title claims abstract description 38
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 38
- 239000007789 gas Substances 0.000 claims description 11
- 210000000078 claw Anatomy 0.000 claims description 3
- 230000003044 adaptive effect Effects 0.000 claims 7
- 239000000446 fuel Substances 0.000 abstract description 8
- 230000004075 alteration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000036647 reaction Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/126—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/082—Details specially related to intermeshing engagement type pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/082—Details specially related to intermeshing engagement type pumps
- F04C18/084—Toothed wheels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/02—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/24—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/28—Safety arrangements; Monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2210/00—Fluid
- F04C2210/10—Fluid working
- F04C2210/1055—Hydrogen (H2)
-
- 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
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel Cell (AREA)
Abstract
The utility model provides a rotational speed self-adaptation hydrogen circulating pump, includes motor, gear room and booster, is equipped with the pressure boost chamber in the booster, installs positive rotor and negative rotor in the pressure boost chamber, is equipped with intake pipe and the blast pipe that is linked together with the pressure boost chamber on the booster, and the intake pipe is equipped with the chamber of admitting air with the intercommunication department in pressure boost chamber, and the pressure sensor that admits air is installed to the intracavity of admitting air, the blast pipe is equipped with the exhaust chamber with the intercommunication department in pressure boost chamber, the exhaust pressure sensor is installed to the exhaust intracavity, admit air chamber and exhaust chamber are linked together through communicating pipe, install the electromagnetism proportional valve on communicating pipe, admit air pressure sensor, exhaust pressure sensor, electromagnetism proportional valve link to each other with the controller respectively. The problem of flow inconsistent under different hydrogen circulating pumps, different operating modes is solved, flow self-correction is realized, the purpose of flow control is achieved, the actual flow in unit time of the hydrogen circulating pump conforms to the calibration value when leaving the factory, and accurate control of the hydrogen circulating pump to the hydrogen gas circuit of the fuel cell system is guaranteed.
Description
The technical field is as follows:
the invention relates to a rotating speed self-adaptive hydrogen circulating pump.
Background art:
the fuel cell generates electric energy through electrochemical reaction between combustible substances (hydrogen) and oxygen in air, wherein after the fuel cell reaction, discharged gas contains a large amount of hydrogen, and if the hydrogen is directly discharged into the atmosphere, the hydrogen is on one hand wasted energy, on the other hand pollutes the environment, and on the other hand, the hydrogen is flammable and combustible, so that danger is generated. Therefore, it is necessary to recover and reuse such hydrogen. At present, these hydrogen-containing mixed gases are generally recycled to the fuel cell by a hydrogen circulation pump for recycling. All present hydrogen circulating pumps all rely on motor speed to adjust in the aspect of flow control, but because of the influence of part machining tolerance and different material thermal expansion coefficients, there is the inconsistent condition in clearance in the two rotor structure of different roots's formula hydrogen circulating pump, thereby it is different to cause its internal leakage, and the hydrogen molecule is little, it is bigger to leak in the same clearance, it is more serious to cause the inconsistent problem of flow, the actual flow in the hydrogen circulating pump unit interval is great with the calibration value when leaving the factory, therefore the accurate control of hydrogen circulating pump to fuel cell system hydrogen gas circuit has been influenced, the development of fuel cell system has been restricted.
In summary, in the field of hydrogen circulation pumps, the above problems have become a technical problem to be solved urgently in the industry.
The invention content is as follows:
in order to make up for the defects of the prior art, the invention provides the hydrogen circulating pump with the self-adaptive rotating speed, solves the problem of inconsistent flow under different hydrogen circulating pumps and different working conditions, and can realize self-correction of the flow.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a rotational speed self-adaptation hydrogen circulating pump, includes motor, gear room and booster, be equipped with the pressure boost chamber in the booster, positive rotor and negative rotor are installed to the pressure boost intracavity, be equipped with intake pipe and the blast pipe that is linked together with the pressure boost chamber on the booster, the intake pipe is equipped with the chamber of admitting air with the intercommunication department in pressure boost chamber, admit air pressure sensor is installed to the intracavity, the blast pipe is equipped with the chamber of exhausting with the intercommunication department in pressure boost chamber, exhaust pressure sensor is installed to the exhaust intracavity, the chamber of admitting air is linked together through communicating pipe with the chamber of exhausting, install the electromagnetism proportional valve on communicating pipe, admit air pressure sensor, exhaust pressure sensor, electromagnetism proportional valve link to each other with the controller respectively.
The air inlet pressure sensor is used for detecting the air pressure in the air inlet cavity and transmitting a data signal to the controller.
The exhaust pressure sensor is used for detecting the gas pressure in the exhaust cavity and transmitting a data signal to the controller.
The controller compares a differential pressure signal between the air inlet pressure sensor and the exhaust pressure sensor with a set range, controls the electromagnetic proportional valve to be opened when the differential pressure signal is lower than the set range, controls part of air in the exhaust cavity to enter the air inlet cavity through the communicating pipe to reduce pressure, and controls the electromagnetic proportional valve to be closed to stabilize pressure when the differential pressure signal is not lower than the set range.
And temperature sensors are also arranged in the air inlet cavity and the air outlet cavity and are connected with the controller.
The temperature sensors are used for detecting the temperatures in the air inlet cavity and the air outlet cavity and transmitting data signals to the controller.
The number of the blades of the male rotor and the female rotor is 2-8.
The male and female rotors comprise roots rotors or claw rotors.
By adopting the scheme, the invention has the following advantages:
the air inlet cavity is internally provided with an air inlet pressure sensor, the exhaust cavity is internally provided with an exhaust pressure sensor, the air inlet cavity is communicated with the exhaust cavity through a communicating pipe, the communicating pipe is internally provided with an electromagnetic proportional valve, the air inlet pressure sensor, the exhaust pressure sensor and the electromagnetic proportional valve are respectively connected with a controller, the air inlet pressure sensor is used for detecting the gas pressure in the air inlet cavity and transmitting a data signal to the controller, the exhaust pressure sensor is used for detecting the gas pressure in the exhaust cavity and transmitting the data signal to the controller, the controller compares a differential pressure signal between the air inlet pressure sensor and the exhaust pressure sensor with a set range, the controller controls the electromagnetic proportional valve to be opened when the differential pressure signal is lower than the set range, part of gas in the exhaust cavity enters the air inlet cavity through the communicating pipe to be depressurized, and controls the electromagnetic proportional valve to be closed to be stabilized when the differential pressure signal is not lower than the set range, the problem of flow inconsistent under different hydrogen circulating pumps, different operating modes is solved, flow self-correction is realized, the purpose of flow control is achieved, the actual flow in unit time of the hydrogen circulating pump conforms to the calibration value when leaving the factory, and accurate control of the hydrogen circulating pump to the hydrogen gas circuit of the fuel cell system is guaranteed.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic top view of the present invention.
In the figure, 1, a motor, 2, a gear chamber, 3, a supercharger, 4, a supercharging cavity, 5, a male rotor, 6, a female rotor, 7, an air inlet cavity, 8, an air inlet pressure sensor, 9, an exhaust cavity, 10, an exhaust pressure sensor, 11, a communicating pipe, 12 and an electromagnetic proportional valve.
The specific implementation mode is as follows:
in order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings.
As shown in fig. 1-2, a rotational speed self-adaptation hydrogen circulating pump, includes motor 1, gear room 2 and booster 3, be equipped with pressure boost chamber 4 in the booster 3, install positive rotor 5 and negative rotor 6 in the pressure boost chamber 4, be equipped with intake pipe and the blast pipe that is linked together with pressure boost chamber 4 on the booster 3, intake pipe and pressure boost chamber 4's intercommunication department is equipped with air intake chamber 7, install air intake pressure sensor 8 in the air intake chamber 7, the blast pipe is equipped with exhaust chamber 9 with pressure boost chamber 4's intercommunication department, install exhaust pressure sensor 10 in the exhaust chamber 9, air intake chamber 7 and exhaust chamber 9 are linked together through communicating pipe 11, install electromagnetic proportional valve 12 on communicating pipe 11, air intake pressure sensor 8, exhaust pressure sensor 10, electromagnetic proportional valve 12 link to each other with the controller respectively.
The intake pressure sensor 8 is used for detecting the gas pressure in the intake cavity 7 and transmitting a data signal to the controller.
The exhaust pressure sensor 10 is used for detecting the gas pressure in the exhaust cavity 9 and transmitting a data signal to the controller.
The controller compares a differential pressure signal between the air inlet pressure sensor 8 and the air outlet pressure sensor 10 with a set range, when the differential pressure signal is lower than the set range, the controller controls the electromagnetic proportional valve 12 to be opened, partial air in the air outlet cavity 9 enters the air inlet cavity 7 through the communicating pipe 11 to be depressurized, and when the differential pressure signal is not lower than the set range, the controller controls the electromagnetic proportional valve 12 to be closed to stabilize the pressure.
And temperature sensors are also arranged in the air inlet cavity 7 and the air exhaust cavity 9 and are connected with a controller.
The temperature sensors are used to detect the temperature in the intake chamber 7 and the exhaust chamber 9 and transmit data signals to the controller.
The number of the blades of the male rotor 5 and the female rotor 6 is 2-8.
The male and female rotors 5, 6 comprise roots or claw rotors.
When the air-cooled generator works, the motor 1 drives the male rotor 5 and the female rotor 6 to rotate at a high speed, gas enters the air inlet cavity 7 from the air inlet pipe, is pressurized in the pressurizing cavity 4 and then is exhausted from the exhaust pipe through the exhaust cavity 9. When the controller detects that a differential pressure signal between the intake pressure sensor 8 and the exhaust pressure sensor 10 is lower than a set range, the controller controls the electromagnetic proportional valve 12 to be opened, and partial gas in the exhaust cavity 9 enters the intake cavity 7 through the communicating pipe 11 to be depressurized; when the controller detects that a differential pressure signal between the air inlet pressure sensor 8 and the exhaust pressure sensor 10 is not lower than a set range, the controller controls the electromagnetic proportional valve 12 to close for pressure stabilization, flow self-correction is achieved, the purpose of flow control is achieved, the actual flow of the hydrogen circulating pump in unit time conforms to a calibration value when the hydrogen circulating pump leaves a factory, and accurate control of the hydrogen circulating pump on a hydrogen gas circuit of a fuel cell system is guaranteed.
The above-described embodiments should not be construed as limiting the scope of the invention, and any alternative modifications or alterations to the embodiments of the present invention will be apparent to those skilled in the art.
The present invention is not described in detail, but is known to those skilled in the art.
Claims (8)
1. The utility model provides a rotational speed self-adaptation hydrogen circulating pump which characterized in that: including motor, gear room and booster, be equipped with the pressure boost chamber in the booster, positive rotor and negative rotor are installed to the pressure boost intracavity, be equipped with intake pipe and the blast pipe that is linked together with the pressure boost chamber on the booster, the intake pipe is equipped with the chamber of admitting air with the intercommunication department in pressure boost chamber, admit air the intracavity and install pressure sensor that admits air, the blast pipe is equipped with the chamber of exhausting with the intercommunication department in pressure boost chamber, exhaust intracavity installs pressure sensor, admit air the chamber and the chamber of exhausting is linked together through communicating pipe, install the electromagnetism proportional valve on communicating pipe, admit air pressure sensor, electromagnetism proportional valve link to each other with the controller respectively.
2. A speed adaptive hydrogen circulation pump according to claim 1, wherein: the air inlet pressure sensor is used for detecting the air pressure in the air inlet cavity and transmitting a data signal to the controller.
3. A speed adaptive hydrogen circulation pump according to claim 1, wherein: the exhaust pressure sensor is used for detecting the gas pressure in the exhaust cavity and transmitting a data signal to the controller.
4. A speed adaptive hydrogen circulation pump according to claim 1, wherein: the controller compares a differential pressure signal between the air inlet pressure sensor and the exhaust pressure sensor with a set range, controls the electromagnetic proportional valve to be opened when the differential pressure signal is lower than the set range, controls part of air in the exhaust cavity to enter the air inlet cavity through the communicating pipe to reduce pressure, and controls the electromagnetic proportional valve to be closed to stabilize pressure when the differential pressure signal is not lower than the set range.
5. A speed adaptive hydrogen circulation pump according to claim 1, wherein: and temperature sensors are also arranged in the air inlet cavity and the air outlet cavity and are connected with the controller.
6. A speed adaptive hydrogen circulation pump according to claim 5, wherein: the temperature sensors are used for detecting the temperatures in the air inlet cavity and the air outlet cavity and transmitting data signals to the controller.
7. A speed adaptive hydrogen circulation pump according to claim 1, wherein: the number of the blades of the male rotor and the female rotor is 2-8.
8. A speed adaptive hydrogen circulation pump according to claim 1, wherein: the male and female rotors comprise roots rotors or claw rotors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210461704.3A CN114876794A (en) | 2022-04-28 | 2022-04-28 | Rotating speed self-adaptive hydrogen circulating pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210461704.3A CN114876794A (en) | 2022-04-28 | 2022-04-28 | Rotating speed self-adaptive hydrogen circulating pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114876794A true CN114876794A (en) | 2022-08-09 |
Family
ID=82672439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210461704.3A Pending CN114876794A (en) | 2022-04-28 | 2022-04-28 | Rotating speed self-adaptive hydrogen circulating pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114876794A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201344125Y (en) * | 2009-02-05 | 2009-11-11 | 江苏津通先锋光电显示技术有限公司 | Roots vacuum pump |
| CN204420236U (en) * | 2014-12-29 | 2015-06-24 | 淄博真空设备厂有限公司 | A kind of adjustable-pressure antivoid valve |
| CN107542662A (en) * | 2017-08-19 | 2018-01-05 | 浙江力鑫真空设备有限公司 | A kind of portable Roots's guiding valve vacuum pump set |
| CN107559200A (en) * | 2017-11-01 | 2018-01-09 | 广东肯富来泵业股份有限公司 | Balanced type Roots vacuum pumping system and its control method |
| CN209687721U (en) * | 2019-03-01 | 2019-11-26 | 广东肯富来泵业股份有限公司 | Roots vaccum pump air cooling system |
| CN114278563A (en) * | 2021-12-23 | 2022-04-05 | 上海重塑能源科技有限公司 | Hydrogen circulating pump for fuel cell, hydrogen circulating system and working method of hydrogen circulating pump |
-
2022
- 2022-04-28 CN CN202210461704.3A patent/CN114876794A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201344125Y (en) * | 2009-02-05 | 2009-11-11 | 江苏津通先锋光电显示技术有限公司 | Roots vacuum pump |
| CN204420236U (en) * | 2014-12-29 | 2015-06-24 | 淄博真空设备厂有限公司 | A kind of adjustable-pressure antivoid valve |
| CN107542662A (en) * | 2017-08-19 | 2018-01-05 | 浙江力鑫真空设备有限公司 | A kind of portable Roots's guiding valve vacuum pump set |
| CN107559200A (en) * | 2017-11-01 | 2018-01-09 | 广东肯富来泵业股份有限公司 | Balanced type Roots vacuum pumping system and its control method |
| CN209687721U (en) * | 2019-03-01 | 2019-11-26 | 广东肯富来泵业股份有限公司 | Roots vaccum pump air cooling system |
| CN114278563A (en) * | 2021-12-23 | 2022-04-05 | 上海重塑能源科技有限公司 | Hydrogen circulating pump for fuel cell, hydrogen circulating system and working method of hydrogen circulating pump |
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