CN113958520A - High-speed centrifugal air compressor for active hydrogen fuel cell vehicle - Google Patents
High-speed centrifugal air compressor for active hydrogen fuel cell vehicle Download PDFInfo
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- CN113958520A CN113958520A CN202111231681.9A CN202111231681A CN113958520A CN 113958520 A CN113958520 A CN 113958520A CN 202111231681 A CN202111231681 A CN 202111231681A CN 113958520 A CN113958520 A CN 113958520A
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- air compressor
- foil
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- wire mesh
- rotor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/10—Centrifugal pumps for compressing or evacuating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
- F04D29/056—Bearings
- F04D29/057—Bearings hydrostatic; hydrodynamic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/284—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a high-speed centrifugal air compressor for an active hydrogen fuel cell vehicle, which comprises a high-speed motor, an impeller, a foil-wire mesh block gas dynamic pressure bearing, a thrust foil gas dynamic pressure bearing, an eddy current displacement sensor, a control system and an air compressor shell, wherein the impeller is arranged on the high-speed motor; the rotor of the high-speed motor is assembled on the air compressor rotor, the impeller is installed on the air compressor rotor, the air compressor rotor is supported by a foil-metal wire mesh block aerodynamic bearing, and a thrust disc on the air compressor rotor is matched with the thrust foil aerodynamic bearing; the eddy current displacement sensor is used for detecting the vibration of the air compressor rotor, and the control system is electrically connected with the eddy current displacement sensor and the actuator of the foil-metal wire mesh block pneumatic dynamic pressure bearing. The invention can adjust the output control voltage through the collected real-time vibration data of the air compressor rotor when the vehicle-mounted working condition changes, thereby realizing the self-adaptive control of the rotor vibration and ensuring the stable and efficient operation of the air compressor rotor.
Description
Technical Field
The invention relates to the technical field of centrifugal air compressors, in particular to a high-speed centrifugal air compressor for an active hydrogen fuel cell vehicle.
Background
Compared with the traditional screw type, Roots type or gear speed-increasing centrifugal air compressor, the gas suspension high-speed centrifugal air compressor has the characteristics of cleanness, no oil, small volume, high power density, high efficiency, low noise, quick dynamic response, high reliability, good protective performance and the like, and is an ideal auxiliary component of a vehicle high-pressure fuel cell engine.
Among them, the foil gas dynamic pressure bearing, which is a supporting component of the air compressor rotor rotating at high speed, is a key component that influences the stability and the service life of the air compressor. The foil gas dynamic pressure bearing is used for forming a supporting gas film by sucking gas into a wedge-shaped space through a rotor rotating at a high speed so as to support the rotor; the elastic foil is connected with the air film in series, so that certain bearing rigidity and damping can be provided, and further, the rotor load can be offset and the rotor vibration can be restrained. Because the foil gas dynamic pressure bearing has the advantages of no oil pollution and high rotating speed, the air compressor rotor with compact structure and high energy density can be designed.
Under the working condition of extremely high DN value (diameter multiplied by rotating speed), the air compressor rotor supported by the foil aerodynamic bearing can generate extremely large subsynchronous vibration under the action of external excitation, and the bearing rotor is rubbed and abraded and the bearing fails in serious cases; meanwhile, the rotor of the air compressor can generate variable axial load when the working condition changes, the stability of the air compressor can be reduced due to impact caused by starting, stopping and accelerating and decelerating of the automobile, and the efficiency and the service life of the high-speed centrifugal air compressor are seriously weakened due to the defects.
The conventional solutions are mainly divided into innovations of the elastic structure of the foil gas dynamic bearing and changes of the shape of the supporting gas film. However, these solutions introduce additional problems such as poor dimensional accuracy and increased start-stop wear of the bearing structure while suppressing the subsynchronous vibration, and the above-mentioned "passive" bearing cannot actively adjust the performance of the bearing with respect to the operating condition of the air compressor, and the operating condition of the application thereof is limited by the established bearing structure.
The piezoelectric ceramic actuator (PZT) generates deformation and driving force through inverse piezoelectric effect after control voltage is applied, rigidity and damping can be generated due to coulomb friction of a plurality of dry friction nodes inside the PZT after the PZT is in interference fit with the metal wire mesh block, the PZT and the metal wire mesh block are combined with the foil gas dynamic pressure bearing through ingenious structural design, radial preloading of the self-adaptive control bearing after the control voltage is applied is realized, the rigidity damping characteristic of the bearing is further changed, and finally vibration control of the air compressor rotor is realized.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, supports the rotor in the radial direction/axial direction through the active foil-metal wire mesh block aerodynamic bearing/foil aerodynamic bearing, directly drives the rotor to rotate by the stator/rotor of the high-speed motor, and uses a high-efficiency impeller to compress air to do work. Compared with a common centrifugal air compressor, the air compressor has the advantages of oil-free lubrication, small friction loss, high rotating speed, high energy density, high efficiency and the like. Compared with the existing high-speed centrifugal air compressor for the hydrogen fuel cell vehicle, the air compressor has the advantage that the rotor vibration is actively controllable in real time, and the overall efficiency of the air compressor can be improved while the high-speed stable operation of the air compressor is ensured. The high-speed centrifugal air compressor for the active hydrogen fuel cell vehicle can obviously improve the stability and the service life of the air compressor for the hydrogen fuel cell vehicle, and has wide application prospect.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-speed centrifugal air compressor for an active hydrogen fuel cell vehicle comprises a high-speed motor, an impeller, a foil-wire mesh block gas dynamic pressure bearing, a thrust foil gas dynamic pressure bearing, an eddy current displacement sensor, a control system and an air compressor shell; the stator, the foil-wire mesh block aerodynamic bearing and the thrust foil aerodynamic bearing of the high-speed motor are coaxially arranged in the air compressor housing, and the rotor of the high-speed motor is assembled on the air compressor rotor and used for driving the air compressor rotor to rotate; the impeller is installed on an air compressor rotor, the air compressor rotor is supported by a foil-metal wire mesh block aerodynamic bearing, a thrust disc is arranged on the air compressor rotor, and the thrust disc is matched with the thrust foil aerodynamic bearing; the eddy current displacement sensor is arranged on a shell of the air compressor, a probe of the eddy current displacement sensor is close to a rotor of the air compressor, an input terminal of the control system is electrically connected with the eddy current displacement sensor, and an output terminal of the control system is electrically connected with an actuator of the foil-wire mesh block aerodynamic bearing.
Further, the air compressor rotor and the high-speed motor rotor are of an integrated structure.
Further, high-efficient impeller passes through bolt fixed mounting on the air compressor machine rotor.
Further, the radial active foil-metal wire mesh block aerodynamic bearing comprises a top foil, a bump foil, a piezoelectric ceramic actuator, a metal wire mesh block, a rigid lever, a steel ball, a spring, a screw and a bearing sleeve; the bearing sleeve is provided with a plurality of actuator mounting grooves which are uniformly arranged along the circumferential direction; the actuator mounting groove is communicated with the central hole of the bearing sleeve; two piezoelectric ceramic actuators, a metal wire mesh block and a rigid lever are arranged in each actuator mounting groove, the rigid lever is Z-shaped, one end of the rigid lever is mounted at the bottom of the actuator mounting groove through a flexible hinge, the metal wire mesh block is mounted between the two piezoelectric ceramic actuators, the metal wire mesh block is positioned outside the rigid lever, and one end of the metal wire mesh block is in contact with the end of the rigid lever connecting actuator mounting groove and is perpendicular to the end of the rigid lever connecting actuator mounting groove; the bearing sleeve is provided with a plurality of threaded holes corresponding to each actuator mounting groove respectively, the threaded holes and the piezoelectric ceramic actuators in the corresponding actuator mounting grooves are positioned on two sides of the rigid lever respectively, and the axes of the threaded holes are parallel to the axes of the piezoelectric ceramic actuators in the corresponding actuator mounting grooves; a screw, a spring and a steel ball are arranged in the threaded hole, one end of the spring is contacted with the screw, the other end of the spring is contacted with the steel ball, and the steel ball is contacted with a rigid lever in a corresponding actuator mounting groove; the top foil and the wave foil are arc-shaped, two ends of the top foil and the wave foil are welded in a central hole of the bearing sleeve, and the top foil is positioned on the inner side of the wave foil; the end face of the other end of the rigid lever is an arc-shaped face and is in contact with the bump foil.
Furthermore, the thrust foil aerodynamic bearing comprises a plurality of top foils, a plurality of wave foils and a thrust bearing bottom plate, wherein the top foils and the wave foils are fan-shaped, the wave foils and the top foils are fixed on the thrust bearing bottom plate in a spot welding mode, the top foils are coaxial and are uniformly arranged along the circumferential direction, and the wave foils are positioned between the corresponding top foils and the thrust bearing bottom plate.
The technical scheme adopted by the invention has the following beneficial effects:
the invention can adjust the output control voltage through the collected real-time vibration data of the air compressor rotor when the vehicle-mounted working condition changes, thereby realizing the self-adaptive control of the rotor vibration and ensuring the stable and efficient operation of the air compressor rotor. The rotor of the air compressor is axially positioned in a thrust foil gas dynamic pressure bearing supporting mode, and the built high-speed centrifugal air compressor for the active hydrogen fuel cell vehicle has the advantages of cleanness, no oil, small volume, high power density, high efficiency, low noise, quick dynamic response, high reliability, good protective performance and the like. The air compressor rotor is supported by a foil-metal wire mesh block pneumatic dynamic pressure bearing, and the rigidity and damping characteristics of the bearing are changed by introducing a piezoelectric ceramic actuator (PZT) and a metal wire mesh block and controlling the control voltage of the PZT. When the vehicle-mounted working condition changes, the invention can monitor the real-time vibration condition of the rotor through the sensor and input the real-time vibration condition as a signal to the air compressor rotor-bearing testing and controlling system, and output proper control voltage through a designed closed loop feedback control algorithm to obtain proper bearing rigidity damping characteristic, thereby ensuring the high efficiency of the whole operation of the air compressor while maintaining the stability of the operation of the air compressor rotor.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a sectional view of a foil-wire mesh block aerodynamic bearing of the present invention.
Fig. 3 is an exploded view of a foil-wire mesh block aerodynamic bearing of the present invention.
Fig. 4 is an enlarged view at I in fig. 2.
Fig. 5 is a front view of a bearing housing of the foil-wire mesh block aerodynamic bearing of the present invention.
Fig. 6 is a sectional view a-a in fig. 5.
FIG. 7 is a top view of a thrust foil aerodynamic bearing of the present invention.
FIG. 8 is a side view, partially enlarged, of a thrust foil aerodynamic bearing of the present invention.
FIG. 9 is a schematic diagram of a vibration adaptive control closed loop according to the present invention; fig. 9 (a) is a diagram showing a correspondence relationship between a control voltage applied to the foil-wire mesh block aerodynamic bearing and an actual working condition of the air compressor; fig. 9 (b) is a control schematic diagram of the control system.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the present invention comprises a high speed motor 1, an impeller 2, 2 foil-wire mesh block aerodynamic bearings 3, a thrust foil aerodynamic bearing 4, a thrust disc 19, an eddy current displacement sensor 5, a control system 7, and an air compressor housing. The stator of the high-speed motor 1, the 2 foil-metal wire mesh block aerodynamic bearings and the thrust foil aerodynamic bearing are coaxially arranged in the air compressor housing, the rotor of the high-speed motor 1 and the air compressor rotor are of an integrated structure, and the high-speed motor 1 is used for driving the air compressor rotor to rotate. The impeller 2 is fixed on the air compressor rotor through a bolt, and the thrust disc 19 is fixed on the air compressor rotor through interference fit, rotates along with the air compressor rotor rotating at a high speed and compresses air to do work. The air compressor rotor is supported by two foil-wire mesh block aerodynamic bearings 3, and a thrust disc on the air compressor rotor is matched with a thrust foil aerodynamic bearing 4 to realize axial limiting of the air compressor rotor. The eddy current displacement sensor 5 is arranged on the shell of the air compressor, the eddy current displacement sensor 5 is arranged close to the foil-wire mesh block aerodynamic bearing 3, and the probe of the eddy current displacement sensor is close to the rotor of the air compressor. An input terminal of the control system 7 is electrically connected with the eddy current displacement sensor 5, and an output terminal of the control system 7 is electrically connected with an actuator of the foil-wire mesh block aerodynamic bearing.
The foil-wire mesh block aerodynamic bearing 3 and the air compressor rotor rotating at high speed form a supporting air film to radially support the air compressor rotor, and simultaneously restrain the transverse vibration of the rotor through the rigidity and damping action of the bearing. The thrust foil aerodynamic bearing 4 and a thrust disc rotating at high speed form a supporting air film to support the air compressor rotor along the axial direction, and meanwhile, the axial vibration of the rotor is restrained through the rigidity and the damping action of the bearing. The invention has compact structure and extremely high power density. The eddy current displacement sensor 5 monitors a vibration signal 6 of the rotor as an input signal of a control system 7, and outputs a control voltage 8 to the pair of radial active foil-wire mesh block aerodynamic bearings 3 through a closed-loop control algorithm to realize the adaptive control of the rotor vibration.
As shown in fig. 2 to 6, the foil-wire mesh block aerodynamic bearing 3 includes a top foil 18, a bump foil 17, a piezoelectric ceramic actuator (PZT) 10, a wire mesh block 11, a rigid lever 13, a steel ball 14, a spring 15, a screw 16, and a bearing housing 9. The bearing sleeve 9 is provided with three actuator mounting grooves which are uniformly arranged along the circumferential direction; the actuator mounting groove communicates with the central bore of the bearing housing 9. Two piezoelectric ceramic actuators 10, a metal wire mesh block 11 and a rigid lever 13 are arranged in each actuator mounting groove, the rigid lever 13 is Z-shaped, and one end of the rigid lever 13 is arranged at the bottom of the actuator mounting groove through a flexible hinge 12. The wire mesh block 11 is mounted between two piezo-ceramic actuators 10, the two piezo-ceramic actuators 10 being arranged in parallel and being capable of being pressed by a rigid lever 13. The wire mesh block 11 is located outside the rigid lever 13, one end of the wire mesh block 11 is in contact with the end of the rigid lever 13 connected to the actuator mounting slot and is perpendicular to the end of the rigid lever 13 connected to the actuator mounting slot, and the elongation of the wire mesh block 11 enables the rigid lever 13 to twist around the flexible hinge. The bearing sleeve 9 is provided with a plurality of threaded holes corresponding to each actuator mounting groove respectively, the threaded holes and the piezoelectric ceramic actuators 10 in the corresponding actuator mounting grooves are positioned on two sides of the rigid lever 13 respectively, and the axes of the threaded holes are parallel to the axes of the metal wire mesh blocks 11 in the corresponding actuator mounting grooves. And a screw 16, a spring 15 and a steel ball 14 are arranged in the threaded hole, one end of the spring 15 is in contact with the screw 16, the other end of the spring is in contact with the steel ball 14, the steel ball 14 is in contact with the rigid lever 13 in the corresponding actuator mounting groove, and when the metal wire mesh block 11 contracts, the spring elasticity can push the rigid lever 13 to reset. The top foil 18 and the wave foil 17 are arc-shaped, the top foil 18 and the wave foil 17 are spot-welded in a central hole of the bearing sleeve, and the top foil 18 is positioned on the inner side of the wave foil 17; the end face of the other end of the rigid lever 13 is an arc-shaped face and contacts with the bump foil 17.
After the PZT 11 receives the control voltage 8, the inverse piezoelectric effect and the interference fit wire mesh block 12 jointly push the rigid lever 13 to form self-adaptive control radial preload, and the dynamic stiffness and dynamic damping characteristic of the bearing are changed by combining the aerodynamic pressure effect.
As shown in fig. 7 to 8, the thrust foil aerodynamic bearing 4 includes a plurality of top foils 18, a plurality of bump foils 17, and a thrust bearing bottom plate 20, the top foils 18 and the bump foils 17 are fan-shaped, the bump foils 18 and the top foils 17 are fixed to the thrust bearing bottom plate by spot welding, the plurality of top foils 18 are coaxially and uniformly arranged in the circumferential direction, and the bump foils 17 are located between the corresponding top foils 18 and the thrust bearing bottom plate 20. When the working condition of the air compressor rotor changes, the time-varying axial supporting force generated by the aerodynamic pressure effect offsets the axial load of the air compressor and inhibits axial vibration.
As shown in fig. 9 (a), the control voltage applied to the foil-wire mesh block aerodynamic bearing 3 has a certain nonlinear correspondence with the actual operating condition of the air compressor, in the region a, too small control voltage may cause too large vibration and poor stability of the air compressor, in the region B, too large control voltage may cause too large running resistance and low running efficiency of the air compressor rotor, in the region C, the control voltage may ensure that the air compressor runs in a stable and small region, and at this time, the air compressor rotor runs in moderate damping and has high running efficiency, so that we need a target control region. As shown in fig. 9 (b), based on the theoretical analysis of the working condition and the control voltage of the air compressor, a corresponding closed-loop control algorithm is designed, the eddy current displacement sensor 5 monitors a real-time vibration signal 6 of the rotor, inputs the vibration signal into the control system 7, and outputs a required control voltage 8 to the pair of foil-wire mesh block aerodynamic bearings 3 through the algorithm to finally realize the adaptive control of the rotor vibration.
Claims (5)
1. The utility model provides an active hydrogen fuel cell vehicle is with high-speed centrifugal air compressor machine which characterized by: the device comprises a high-speed motor, an impeller, a foil-wire mesh block aerodynamic bearing, a thrust foil aerodynamic bearing, an eddy current displacement sensor, a control system and an air compressor shell; the stator, the foil-wire mesh block aerodynamic bearing and the thrust foil aerodynamic bearing of the high-speed motor are coaxially arranged in the air compressor housing, and the rotor of the high-speed motor is assembled on the air compressor rotor and used for driving the air compressor rotor to rotate; the impeller is installed on an air compressor rotor, the air compressor rotor is supported by a foil-metal wire mesh block aerodynamic bearing, a thrust disc is arranged on the air compressor rotor, and the thrust disc is matched with the thrust foil aerodynamic bearing; the eddy current displacement sensor is arranged on a shell of the air compressor, a probe of the eddy current displacement sensor is close to a rotor of the air compressor, an input terminal of the control system is electrically connected with the eddy current displacement sensor, and an output terminal of the control system is electrically connected with an actuator of the foil-wire mesh block aerodynamic bearing.
2. The active hydrogen fuel cell vehicle high-speed centrifugal air compressor of claim 1, characterized in that: the air compressor rotor and the high-speed motor rotor are of an integrated structure.
3. The active hydrogen fuel cell vehicle high-speed centrifugal air compressor of claim 1, characterized in that: the high-efficiency impeller is fixedly installed on the air compressor rotor through bolts.
4. The active hydrogen fuel cell vehicle high-speed centrifugal air compressor of claim 1, characterized in that: the radial active foil-metal wire mesh block aerodynamic bearing comprises a top foil, a corrugated foil, a piezoelectric ceramic actuator, a metal wire mesh block, a rigid lever, a steel ball, a spring, a screw and a bearing sleeve; the bearing sleeve is provided with a plurality of actuator mounting grooves which are uniformly arranged along the circumferential direction; the actuator mounting groove is communicated with the central hole of the bearing sleeve; two piezoelectric ceramic actuators, a metal wire mesh block and a rigid lever are arranged in each actuator mounting groove, the rigid lever is Z-shaped, one end of the rigid lever is mounted at the bottom of the actuator mounting groove through a flexible hinge, the metal wire mesh block is mounted between the two piezoelectric ceramic actuators, the metal wire mesh block is positioned outside the rigid lever, and one end of the metal wire mesh block is in contact with the end of the rigid lever connecting actuator mounting groove and is perpendicular to the end of the rigid lever connecting actuator mounting groove; the bearing sleeve is provided with a plurality of threaded holes corresponding to each actuator mounting groove respectively, the threaded holes and the piezoelectric ceramic actuators in the corresponding actuator mounting grooves are positioned on two sides of the rigid lever respectively, and the axes of the threaded holes are parallel to the axes of the piezoelectric ceramic actuators in the corresponding actuator mounting grooves; a screw, a spring and a steel ball are arranged in the threaded hole, one end of the spring is contacted with the screw, the other end of the spring is contacted with the steel ball, and the steel ball is contacted with a rigid lever in a corresponding actuator mounting groove; the top foil and the wave foil are arc-shaped, two ends of the top foil and the wave foil are welded in a central hole of the bearing sleeve, and the top foil is positioned on the inner side of the wave foil; the end face of the other end of the rigid lever is an arc-shaped face and is in contact with the bump foil.
5. The active hydrogen fuel cell vehicle high-speed centrifugal air compressor of claim 1, characterized in that: the thrust foil gas dynamic pressure bearing comprises a plurality of top foils, a plurality of wave foils and a thrust bearing bottom plate, wherein the top foils and the wave foils are fan-shaped, the wave foils and the top foils are fixed on the thrust bearing bottom plate in a spot welding mode, the top foils are coaxial and are uniformly arranged along the circumferential direction, and the wave foils are positioned between the corresponding top foils and the thrust bearing bottom plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111231681.9A CN113958520A (en) | 2021-10-22 | 2021-10-22 | High-speed centrifugal air compressor for active hydrogen fuel cell vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111231681.9A CN113958520A (en) | 2021-10-22 | 2021-10-22 | High-speed centrifugal air compressor for active hydrogen fuel cell vehicle |
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| Publication Number | Publication Date |
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| CN113958520A true CN113958520A (en) | 2022-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111231681.9A Pending CN113958520A (en) | 2021-10-22 | 2021-10-22 | High-speed centrifugal air compressor for active hydrogen fuel cell vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114526248A (en) * | 2022-03-01 | 2022-05-24 | 北京前沿动力科技有限公司 | Centrifugal air compressor for hydrogen fuel cell |
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2021
- 2021-10-22 CN CN202111231681.9A patent/CN113958520A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114526248A (en) * | 2022-03-01 | 2022-05-24 | 北京前沿动力科技有限公司 | Centrifugal air compressor for hydrogen fuel cell |
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