Hydrogen circulating pump integrating gear and axial flux motor rotor

Abstract

The utility model relates to a hydrogen circulating pump integrating a gear and an axial magnetic flux motor rotor. The hydrogen compressor comprises a shell, the shell comprises a hydrogen compression cavity, a gear cavity and a motor stator cavity, and the motor stator cavity and the gear cavity are separated from each other; the driving shaft is sleeved with a driving air compression rotor located in the hydrogen compression cavity and a driving gear rotor located in the gear cavity; the driven shaft is sleeved with a driven compression rotor which is positioned in the hydrogen compression cavity and is matched with the driving compression rotor and a driven gear which is positioned in the gear cavity and is matched with the driving gear rotor; and the axial magnetic flux structure comprises a permanent magnet mounted on the driving gear rotor and a motor stator arranged in the motor stator cavity. Potential safety hazards possibly caused by the arcing phenomenon of the motor are avoided, and the safety of the hydrogen circulating pump is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen fuel cells, in particular to a hydrogen circulation pump integrating a gear and an axial flux motor rotor. Background Art

[0002] The hydrogen circulation pump pumps the unreacted hydrogen at the anode outlet of the fuel cell back to the inlet from the anode outlet of the fuel cell to realize the recycling of hydrogen and thus improve the utilization rate.

[0003] Its working principle is that the gear at the end of the driving shaft and the gear at the end of the driven shaft mesh with each other, the controller energizes the stator of the permanent magnet motor to drive the motor rotor to rotate, the motor rotor drives the driving shaft to rotate, the driving shaft drives the driven shaft to rotate in the opposite direction at the same speed through the meshing gears, and drives the rotor pressed at the front end of the two shafts to rotate in the opposite direction at the same speed with the shaft in the hydrogen compression chamber, so that the volume of the cavity changes and the gas in and out is realized.

[0004] However, the hydrogen compression chamber of the existing hydrogen circulation pump may leak hydrogen into the motor stator chamber due to gas seal failure. When the motor stator is powered on at high voltage, there is a small probability of motor arcing, posing a safety hazard. Summary of the invention

[0005] To this end, the utility model provides a hydrogen circulation pump with integrated gears and an axial flux motor rotor, which avoids possible contact between hydrogen and the motor stator, avoids the potential safety hazards caused by motor arcing, and enhances the safety of the hydrogen circulation pump.

[0006] In order to solve the above technical problems, the utility model provides a hydrogen circulation pump integrating a gear and an axial flux motor rotor, comprising:

[0007] A housing, comprising a hydrogen compression chamber, a gear chamber and a motor stator chamber, wherein the motor stator chamber and the gear chamber are separated from each other;

[0008] A driving shaft, sleeved with a driving compressor rotor located in the hydrogen compression chamber and a driving gear rotor located in the gear chamber;

[0009] A driven shaft, sleeved with a driven compressor rotor located in the hydrogen compression chamber and matched with the active compressor rotor, and a driven gear located in the gear chamber and matched with the active gear rotor;

[0010] The axial magnetic flux structure comprises a permanent magnet installed on the driving gear rotor and a motor stator arranged in the motor stator cavity.

[0011] In one embodiment of the utility model, the shell includes an outer shell and a hydrogen compression chamber cover and a gear housing respectively matched with the two axial ends of the outer shell, a hydrogen compression chamber is formed between the outer shell and the hydrogen compression chamber cover, and a gear chamber is formed between the outer shell and the gear housing.

[0012] In one embodiment of the present utility model, the housing further comprises a motor housing installed at the open end of the gear box body, and the motor housing is enclosed and installed with a motor housing cover.

[0013] In one implementation of the utility model, a hydrogen compression chamber sealing ring is sealed between the shell and the hydrogen compression chamber cover.

[0014] In one embodiment of the present utility model, a gear box sealing ring is sealed between the housing and the gear box body.

[0015] In one implementation of the utility model, the hydrogen compression chamber cover is equipped with inlet and outlet gas joints.

[0016] In one implementation of the utility model, a stator cavity sealing ring is sealed between the motor housing and the motor housing cover.

[0017] In an implementation manner of the present utility model, the driving shaft and / or the driven shaft are sequentially sleeved with front bearings in contact with the housing.

[0018] In one implementation manner of the utility model, the driving shaft and / or the driven shaft are sequentially sleeved with a dust ring, an air seal, an oil seal, a bearing pad and a rear bearing in contact with the housing.

[0019] In one implementation of the utility model, the driving gear rotor is made of polyetheretherketone material.

[0020] The above technical solution of the utility model has the following advantages compared with the prior art:

[0021] The utility model discloses a hydrogen circulation pump with integrated gear and axial flux motor rotor. Since the motor stator and hydrogen compression chamber are at both ends of the circulation pump and the axial flux motor structure is adopted, the motor rotor and the motor stator are not in the same space, and the two spaces are not connected. Hydrogen leaked due to gas seal failure will only accumulate in the gear cavity and cannot leak into the electronic stator cavity, thus avoiding the safety hazard of hydrogen under the motor arcing phenomenon and enhancing the safety of the hydrogen circulation pump.

[0022] Due to the integrated structure of gears and axial flux motor rotors, and the use of non-magnetic polyetheretherketone (PEEK) material for the active gear rotor, the axial space of the hydrogen circulation pump is reduced, the structure is more compact, the assembly is improved, the moment of inertia is reduced, and the transmission efficiency and response speed are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments of the utility model in combination with the accompanying drawings.

[0024] Figure 1 It is a schematic diagram of the overall structure of a hydrogen circulation pump in which gears and an axial flux motor rotor are integrated according to the utility model.

[0025] Description of the Figures in the Specification:

[0026] 1. Inlet and outlet joints; 2. Front bearing; 3. Hydrogen compression chamber cover; 4. Hydrogen compression chamber sealing ring; 5. Active compressor rotor; 6. Housing; 7. Dust ring; 8. Air seal; 9. Oil seal; 10. Bearing pad; 11. Rear bearing; 12. Driven gear; 13. Gear box; 14. Driven shaft; 15. Active gear rotor; 16. Rotor chamber sealing ring; 17. Permanent magnet; 18. Motor housing; 19. Motor housing cover; 20. Stator chamber sealing ring; 21. Motor stator; 22. Gear box sealing ring; 23. Active shaft; 24. Driven compressor rotor. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0028] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0029] In the present utility model, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present utility model, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0031] Reference Figure 1 As shown, the utility model is a hydrogen circulation pump integrating a gear and an axial flux motor rotor, comprising:

[0032] A housing, comprising a hydrogen compression chamber, a gear chamber and a motor stator chamber, wherein the motor stator chamber and the gear chamber are separated from each other;

[0033] The driving shaft 23 is sleeved with the driving compressor rotor 5 located in the hydrogen compression chamber and the driving gear rotor 15 located in the gear chamber;

[0034] The driven shaft 14 is sleeved with a driven compressor rotor 24 located in the hydrogen compression chamber and matched with the active compressor rotor 5, and a driven gear 12 located in the gear chamber and matched with the active gear rotor 15;

[0035] The axial magnetic flux structure includes a permanent magnet 17 mounted on the driving gear rotor 15 and a motor stator 21 disposed in the motor stator cavity.

[0036] Since the motor stator 21 and the hydrogen compression chamber are at both ends of the circulating pump and an axial flux motor structure is adopted, the motor rotor and the motor stator 21 are not in the same space, and the two spaces are not connected. Hydrogen leaked due to failure of the gas seal 8 will only accumulate in the gear cavity and cannot leak into the electronic stator cavity, thus avoiding the safety hazard of hydrogen under the arcing phenomenon of the motor and enhancing the safety of the hydrogen circulating pump.

[0037] In addition, the integrated design of gears and axial flux motor rotors makes the structure of the entire hydrogen circulation pump more compact, which not only saves space but also simplifies the assembly and maintenance process.

[0038] In one embodiment, the shell includes an outer shell 6 and a hydrogen compression chamber cover 3 and a gear box body 13 respectively matched with the two axial ends of the outer shell 6, a hydrogen compression chamber is formed between the outer shell 6 and the hydrogen compression chamber cover 3, and a gear chamber is formed between the outer shell 6 and the gear box body 13.

[0039] In one embodiment, the housing further comprises a motor housing 18 mounted on the open end of the gear housing 13 , and the motor housing 18 is enclosed with a motor housing cover plate 19 .

[0040] In one embodiment, a hydrogen compression chamber sealing ring 4 is sealed between the housing 6 and the hydrogen compression chamber cover 3 .

[0041] In one embodiment, a gear box sealing ring 22 is sealed between the housing 6 and the gear box body 13 .

[0042] In one embodiment, the hydrogen compression chamber cover 3 is installed with an inlet and outlet gas connector 1 .

[0043] In one embodiment, a stator cavity sealing ring 20 is sealed between the motor housing 18 and the motor housing cover plate 19 .

[0044] In one embodiment, the driving shaft 23 and / or the driven shaft 14 are sequentially sleeved with a front bearing 2 in contact with the housing.

[0045] Specifically, the left ends of the driven shaft 14 and the driving shaft 23 are respectively interference fit with the active compressor rotor 5 and the driven compressor rotor 24 , and the right ends are respectively interference fit with the driving gear rotor 15 and the driven gear 12 .

[0046] The front bearing 2 has an interference fit with the driven shaft 14 and the driving shaft 23 , and has a clearance fit with the hydrogen compression chamber cover 3 ; the rear bearing 11 has an interference fit with the driven shaft 14 and the driving shaft 23 , and has an interference fit with the housing 6 .

[0047] In one embodiment, the driving shaft 23 and / or the driven shaft 14 are sequentially sleeved with a dust ring 7, an air seal 8, an oil seal 9, a bearing pad 10 and a rear bearing 11 in contact with the housing, wherein the dust ring 7, the air seal 8, the oil seal 9 and the housing 6 are all interference fit, and the motor stator 21 and the motor housing 18 are transition fit. Through the multiple sealing design, the sealing performance of the system is enhanced to prevent leakage.

[0048] In one embodiment, the driving gear rotor 15 is made of non-magnetic polyetheretherketone (PEEK). Due to the use of a structure in which the gear and the axial flux motor rotor are integrated, and the driving gear rotor 15 is made of non-magnetic polyetheretherketone (PEEK) material, the axial space of the hydrogen circulation pump is reduced, the structure is more compact, the moment of inertia is reduced, and the transmission efficiency and response speed are improved.

[0049] During operation, the controller energizes the components to drive the driving gear rotor 15 to rotate, and the driving gear rotor 15 drives the driving shaft 23 to rotate. The driving gear rotor 15 drives the driven shaft 14 to rotate in the opposite direction at the same speed through the driven gear 12 meshing therewith. The driving shaft 23 and the driven shaft 14 respectively drive the active compressor rotor 5 and the driven compressor rotor 24 to rotate in the opposite direction at the same speed, so that the volume in the hydrogen compression chamber changes, realizing the air inlet and outlet functions.

[0050] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to examples, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A hydrogen circulation pump with integrated gear and axial flux motor rotor, characterized in that: include: A housing, comprising a hydrogen compression chamber, a gear chamber and a motor stator chamber, wherein the motor stator chamber and the gear chamber are separated from each other; A driving shaft (23) sleeved with a driving compressor rotor (5) located in the hydrogen compression chamber and a driving gear rotor (15) located in the gear chamber; A driven shaft (14) sleeved with a driven compressor rotor (24) located in the hydrogen compression chamber and cooperating with the active compressor rotor (5) and a driven gear (12) located in the gear chamber and cooperating with the active gear rotor (15); An axial magnetic flux structure comprises a permanent magnet (17) mounted on the driving gear rotor (15) and a motor stator (21) disposed in the motor stator cavity.

2. A hydrogen circulation pump with integrated gear and axial flux motor rotor according to claim 1, characterized in that: The housing comprises an outer shell (6) and a hydrogen compression chamber cover (3) and a gear housing (13) respectively matched with two axial ends of the outer shell (6); a hydrogen compression chamber is formed between the outer shell (6) and the hydrogen compression chamber cover (3); and a gear chamber is formed between the outer shell (6) and the gear housing (13).

3. A hydrogen circulation pump with integrated gear and axial flux motor rotor according to claim 2, characterized in that: The housing further comprises a motor housing (18) mounted on the open end of the gear housing (13), and a motor housing cover plate (19) is installed in a closed manner on the motor housing (18).

4. A hydrogen circulation pump with integrated gear and axial flux motor rotor according to claim 2, characterized in that: A hydrogen compression chamber sealing ring (4) is sealed between the outer shell (6) and the hydrogen compression chamber cover (3).

5. The hydrogen circulation pump with integrated gear and axial flux motor rotor according to claim 2, characterized in that: A gear box sealing ring (22) is sealed between the housing (6) and the gear box body (13).

6. A hydrogen circulation pump with integrated gear and axial flux motor rotor according to claim 2, characterized in that: The hydrogen compression chamber cover (3) is provided with an inlet and outlet gas connector (1).

7. A hydrogen circulation pump with integrated gear and axial flux motor rotor according to claim 3, characterized in that: A stator cavity sealing ring (20) is sealed between the motor housing (18) and the motor housing cover plate (19).

8. The hydrogen circulation pump with integrated gear and axial flux motor rotor according to claim 1, characterized in that: The driving shaft (23) and / or the driven shaft (14) are sequentially sleeved with front bearings (2) in contact with the housing.

9. The hydrogen circulation pump with integrated gear and axial flux motor rotor according to claim 1, characterized in that: The driving shaft (23) and / or the driven shaft (14) are sequentially sleeved with a dust ring (7), an air seal (8), an oil seal (9), a bearing pad (10) and a rear bearing (11) which are in contact with the housing.

10. The hydrogen circulation pump with integrated gear and axial flux motor rotor according to claim 1, characterized in that: The driving gear rotor (15) is made of polyetheretherketone material.

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