Roots type hydrogen circulating pump

Abstract

The utility model relates to the field of circulating pumps, in particular to a Roots type hydrogen circulating pump which comprises a rotor shell and a motor shell, a gear chamber and a rotor cavity are arranged in the rotor shell, and a driving rotor shaft and a driven rotor shaft are arranged in the rotor shell; one end of the driving rotor shaft is provided with a driving rotor; one end of the driven rotor shaft is provided with a driven rotor and one end is provided with a driven gear; the driving gear is meshed with the driven gear; a motor is arranged in the motor shell; the driving rotor shaft is in transmission fit with the motor; the driving rotor and the driven rotor are roots type rotors and are provided with two roots blades; a base is arranged at the bottom of the rotor shell; an air inlet and an air outlet are formed in the bottom of The effective volume of the hydrogen circulating pump is increased by adopting the two-lobed roots blade design; and meanwhile, the designed base and the air inlet and the air outlet at the bottom of the base are arranged on the same side, so that pipelines are more convenient to arrange, the bottom space of the rotor shell can be utilized, and the occupied volume is reduced.

Description

Technical Field

[0001] The utility model relates to the field of circulating pumps, in particular to a Roots-type hydrogen circulating pump. Background Art

[0002] Hydrogen fuel cell vehicles use the charge transfer during the chemical reaction between hydrogen and oxygen to form an electric current, thereby directly converting chemical energy into electrical energy to drive the vehicle's motor. Compared with traditional non-renewable energy sources such as petroleum, hydrogen has the characteristics of wide source, cleanliness, low noise, and high conversion efficiency, so it can be widely used in transportation fields such as automobiles and trains. In order to prevent the excess hydrogen in the hydrogen fuel cell system from being discharged from the hydrogen fuel cell reaction system after the chemical reaction with oxygen, resulting in a waste of hydrogen, it is necessary to recover the excess hydrogen through a hydrogen circulation pump. The existing hydrogen circulation pump has a complex structure and a large overall volume; the inlet and outlet are arranged on opposite sides, and the subsequent connection extension pipeline is easily limited in position, which is inconvenient to arrange. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a Roots-type hydrogen circulation pump which has a simple structure, optimized overall volume and convenient arrangement.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is as follows: a Roots-type hydrogen circulation pump, comprising a rotor housing and a motor housing, wherein a gear chamber and a rotor cavity are sequentially arranged in the rotor housing along its length direction, and a driving rotor shaft and a driven rotor shaft are arranged in the rotor housing; the driving rotor shaft is provided with a driving rotor at one end in the rotor cavity, and a driving gear is arranged at one end in the gear chamber; the driven rotor shaft is provided with a driven rotor at one end in the rotor cavity, and a driven gear is arranged at one end in the gear chamber; the driving gear is meshed with the driven gear; a motor is arranged in the motor housing, and the driving rotor shaft extends into the motor housing to cooperate with the motor transmission; the driving rotor and the driven rotor are both Roots-type rotors that cooperate with each other, and are provided with two-leaf Roots blades; a base is provided at the bottom of the rotor housing, and an air inlet and an exhaust port communicated with the rotor cavity are provided at the bottom of the base.

[0005] Furthermore, a first sealing member is provided on a portion of the driving rotor shaft between the gear chamber and the rotor chamber and a portion of the driven rotor shaft between the gear chamber and the rotor chamber.

[0006] Furthermore, a second sealing member is provided on a portion of the active rotor shaft between the gear chamber and the motor housing.

[0007] Furthermore, a rear end cover is provided on one side of the rotor housing, and the rear end cover is opposite to the rotor cavity; a first fastener is provided on the rear end cover, and the first fastener connects the rear end cover and the rotor housing.

[0008] Furthermore, a third sealing member is provided at the portion where the rear end cover abuts against the rotor housing.

[0009] Furthermore, the rear end cover is provided with a clearance groove corresponding to one end of the driving rotor shaft and one end of the driven rotor shaft; one end of the driving rotor shaft and the driven rotor shaft extends to the corresponding clearance groove.

[0010] Furthermore, a motor connecting plate is provided between the rotor housing and the motor housing; the motor connecting plate is opposite to the gear chamber; a second fastener is provided on the motor connecting plate, and the second fastener connects the motor connecting plate and the rotor housing; a third fastener is provided on the motor housing, and the third fastener connects the motor housing and the motor connecting plate.

[0011] Furthermore, a fourth sealing member is provided at the portion where the motor connecting plate abuts against the rotor housing.

[0012] Furthermore, the motor connecting plate is provided with a mounting groove, the motor housing is docked in the mounting groove, and a limit baffle is provided on the periphery of the motor housing, the limit baffle abuts against the mounting groove and the limit baffle and the motor connecting plate are connected by a third fastener.

[0013] Furthermore, a fifth sealing member is provided at the portion of the motor housing abutting against the inner wall of the mounting groove.

[0014] The beneficial effects of the utility model are as follows: the driving rotor transmission shaft and the driving rotor are driven to rotate by the motor, and the driving gear and the driven gear simultaneously drive the driven rotor transmission shaft and the driven rotor to rotate; with the cooperation of the two Roots-type rotors of the driving rotor and the driven rotor, it is possible to draw excess hydrogen from the air inlet into the rotor cavity and discharge it out of the exhaust port for recycling; the Roots-type rotor structure is adopted, which has a simple structure, strong pressure bearing capacity and high reliability; a two-leaf Roots blade design is adopted to increase the effective volume of the hydrogen circulation pump; at the same time, the air inlet and the exhaust port of the base and the bottom of the base are arranged on the same side, which is more convenient for the arrangement of pipelines than the conventional arrangement of hydrogen circulation pumps on the opposite sides, and the air inlet and the exhaust port can utilize the bottom space of the rotor shell to reduce the occupied volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a Roots-type hydrogen circulation pump according to a specific embodiment of the utility model;

[0016] Figure 2 It is a structural schematic diagram of a base of a Roots-type hydrogen circulation pump according to a specific implementation manner of the utility model.

[0017] Description of labels:

[0018] 1. rotor housing; 11. gear chamber; 12. rotor cavity; 13. driving rotor shaft; 14. driven rotor shaft; 15. driving rotor; 16. driven rotor; 17. driving gear; 18. driven gear; 19. base; 110. air inlet; 111. exhaust port; 112. first bearing; 113. second bearing;

[0019] 2. Motor housing; 21. Motor; 22. Limit baffle;

[0020] 3. First seal; 4. Second seal; 5. Rear end cover; 51. Make way groove; 6. First fastener; 7. Third seal; 8. Motor connecting plate; 81. Mounting groove; 9. Second fastener; 10. Third fastener; 101. Fourth seal; 102. Fifth seal; 103. Locking nut. DETAILED DESCRIPTION

[0021] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0022] Please refer to Figure 1 and Figure 2 A Roots-type hydrogen circulation pump comprises a rotor housing 1 and a motor housing 2. A gear chamber 11 and a rotor chamber 12 are sequentially arranged in the rotor housing 1 along its length direction. A driving rotor shaft 13 and a driven rotor shaft 14 are arranged in the rotor housing 1; a driving rotor 15 is arranged at one end of the driving rotor shaft 13 in the rotor chamber 12, and a driving gear 17 is arranged at one end in the gear chamber 11; a driven rotor 16 is arranged at one end of the driven rotor shaft 14 in the rotor chamber 12, and a driven gear 18 is arranged at one end in the gear chamber 11; the driving gear 17 is meshed with the driven gear 18; a motor 21 is arranged in the motor housing 2, and the driving rotor shaft 13 extends into the motor housing 2 and cooperates with the motor 21 in transmission; the driving rotor 15 and the driven rotor 16 are both mutually matched Roots-type rotors, which are provided with two-leaf Roots blades; a base 19 is arranged at the bottom of the rotor housing 1, and an air inlet 110 and an exhaust port 111 communicated with the rotor chamber 12 are arranged at the bottom of the base 19.

[0023] As can be seen from the above description, the beneficial effects of the utility model are: the driving shaft of the active rotor 15 and the active rotor 15 are driven to rotate by the motor 21, and the driving gear 17 and the driven gear 18 simultaneously drive the driven rotor 16 shaft and the driven rotor 16 to rotate; with the cooperation of the two Roots-type rotors of the active rotor 15 and the driven rotor 16, it is possible to draw excess hydrogen from the air inlet 110 into the rotor cavity 12 and discharge it out of the exhaust port 111 for recycling; the Roots-type rotor structure is adopted, which has a simple structure, strong pressure bearing capacity and high reliability; a two-leaf Roots blade design is adopted to increase the effective volume of the hydrogen circulation pump; at the same time, the base 19 and the air inlet 110 and the exhaust port 111 at the bottom of the base 19 are arranged on the same side, which is more convenient for the arrangement of pipelines than the conventional arrangement of the hydrogen circulation pump on the opposite sides, and at the same time, the air inlet 110 and the exhaust port 111 can utilize the bottom space of the rotor housing 1 to reduce the occupied volume.

[0024] Furthermore, a first seal 3 is provided on a portion of the driving rotor shaft 13 between the gear chamber 11 and the rotor chamber 12 and a portion of the driven rotor shaft 14 between the gear chamber 11 and the rotor chamber 12 .

[0025] From the above description, it can be seen that the arrangement of the first seal 3 can achieve sealing of the connecting part between the gear chamber 11 and the rotor chamber 12, preventing the lubricating oil in the gear chamber 11 from leaking into the rotor chamber to contaminate the hydrogen and reduce the purity of the hydrogen, and preventing the hydrogen in the rotor chamber from leaking into the gear chamber 11 to reduce the working performance of the hydrogen pump.

[0026] Furthermore, a second sealing member 4 is provided on a portion of the driving rotor shaft 13 between the gear chamber 11 and the motor housing 2 .

[0027] From the above description, it can be seen that the arrangement of the second seal 4 can achieve sealing of the connecting part between the gear chamber 11 and the motor housing 2, preventing the lubricating oil in the gear chamber 11 from leaking into the motor housing 2, causing corrosion of the winding insulation components of the motor 21, and causing a short circuit to burn the motor 21.

[0028] Furthermore, a rear end cover 5 is provided on one side of the rotor housing 1 , and the rear end cover 5 is opposite to the rotor cavity 12 ; a first fastener 6 is provided on the rear end cover 5 , and the first fastener 6 connects the rear end cover 5 and the rotor housing 1 .

[0029] As can be seen from the above description, the complete rotor cavity 12 is formed by combining the rear end cover 5 and the corresponding part of the rotor housing 1 and is connected and fixed to the rotor housing 1 by the first fastener 6, so that the active rotor 15 and the driven rotor 16 can be easily maintained and replaced.

[0030] Furthermore, a third sealing member 7 is provided at the portion where the rear end cover 5 abuts against the rotor housing 1 .

[0031] It can be seen from the above description that the third seal 7 is provided to prevent the compressed hydrogen in the rotor cavity 12 from leaking into the environment through the gap between the rear end cover 5 and the rotor housing 1 to cause unsafe factors.

[0032] Furthermore, the rear end cover 5 is provided with a clearance groove 51 corresponding to one end of the driving rotor shaft 13 and one end of the driven rotor shaft 14 ; one end of the driving rotor shaft 13 and one end of the driven rotor shaft 14 extend to the corresponding clearance groove 51 .

[0033] From the above description, it can be seen that the design of the clearance groove 51 can meet the layout requirements of the active rotor shaft 13 and the driven rotor shaft 14, and can reduce the modification of the rotor housing 1. The rear end cover 5 of the relatively small component is adjusted inwardly to meet the layout requirements; the clearance groove 51 during assembly can also play a certain positioning role.

[0034] Furthermore, a motor 21 connecting plate is provided between the rotor housing 1 and the motor housing 2; the motor 21 connecting plate is opposite to the gear chamber 11; a second fastener 9 is provided on the motor 21 connecting plate, and the second fastener 9 connects the motor 21 connecting plate and the rotor housing 1; a third fastener 10 is provided on the motor housing 2, and the third fastener 10 connects the motor housing 2 and the motor 21 connecting plate.

[0035] From the above description, it can be seen that the complete gear chamber 11 is formed by the combination of the motor 21 connecting plate and the corresponding part of the rotor housing 1, and is connected to the rotor housing 1 through the second fastener 9; at the same time, the motor 21 connecting plate also serves as a structure for connecting the motor housing 2, and the motor housing 2 and the motor 21 connecting plate are connected and fixed by the third fastener 10 on the motor housing 2.

[0036] Furthermore, a fourth sealing member 101 is provided at the portion where the connecting plate of the motor 21 abuts against the rotor housing 1 .

[0037] It can be seen from the above description that the fourth seal 101 is provided to prevent the compressed hydrogen in the rotor chamber 12 from leaking into the environment to cause unsafe factors and the lubricating oil in the gear chamber 11 from leaking into the environment to cause pollution.

[0038] Furthermore, a mounting groove 81 is provided on the connecting plate of the motor 21, and the motor housing 2 is docked in the mounting groove 81. A limit baffle 22 is provided on the periphery of the motor housing 2, and the limit baffle 22 abuts against the mounting groove 81 and is connected to the connecting plate of the motor 21 by a third fastener 10.

[0039] From the above description, it can be known that the mounting groove 81 of the connecting plate of the motor 21 is designed to match the assembly of the motor housing 2, and the installation is limited by the abutment between the limiting baffle 22 on the periphery of the motor housing 2 and the edge of the mounting groove 81.

[0040] Furthermore, a fifth sealing member 102 is provided at a portion of the motor housing 2 that abuts against an inner wall of the mounting groove 81 .

[0041] It can be seen from the above description that the provision of the fifth seal 102 prevents the compressed hydrogen in the rotor cavity 12 or the lubricating oil in the gear chamber 11 from leaking into the motor housing 2 through the component fitting gap and leaking from the motor housing 2 into the environment, causing unsafe factors; in addition, the design of the limit baffle 22 also cooperates with the sealing of the fifth seal 102 to a certain extent, so that the compressed hydrogen or lubricating oil that may leak cannot pass directly through the component fitting gap.

[0042] Reference Figure 1 and Figure 2 , Embodiment 1:

[0043] Application scenario: In order to prevent the excess hydrogen from being discharged from the hydrogen fuel cell system after the chemical reaction with oxygen, resulting in hydrogen waste, it is necessary to recover the excess hydrogen through a hydrogen circulation pump. The existing hydrogen circulation pump has a complex structure and a large overall volume; the inlet and outlet are arranged on the opposite sides, and the subsequent connection extension pipeline is easily limited in position and inconvenient to arrange.

[0044] like Figure 1 to Figure 2 As shown, the Roots-type hydrogen circulation pump of this embodiment includes a rotor housing 1 and a motor housing 2.

[0045] The rotor housing 1 is provided with a gear chamber 11 and a rotor chamber 12 in sequence along its length direction. A driving rotor shaft 13 and a driven rotor shaft 14 are provided in the rotor housing 1. A driving rotor 15 is provided at one end of the driving rotor shaft 13 in the rotor chamber 12. Specifically, a stop step and a locking nut 103 are provided on the driving rotor shaft 13. The driving rotor 15 is sleeved on the driving rotor shaft 13, with one side of the driving rotor 15 being stopped against the stop step and the other side being locked into the locking nut 103 on the driving rotor shaft 13 to stop and fix the stop step. A driving gear 17 is provided at one end in the gear chamber 11.

[0046] The driven rotor shaft 14 is provided with a driven rotor 16 at one end in the rotor cavity 12, and a stop step and a locking nut 103 are provided on the driven rotor shaft 14. The driven rotor 16 is sleeved on the driven rotor shaft 14, and one side of the driven rotor 16 is stopped by the stop step, and the other side is locked by the locking nut 103 on the driven rotor shaft 14 to stop and fix it; a driven gear 18 is provided at one end in the gear chamber 11; the driving gear 17 is meshed with the driven gear 18;

[0047] The driving rotor shaft 13 and the driven rotor shaft 14 are provided with a single support structure on both sides of the driving rotor 15 and the driven rotor 16, so as to reduce the weight of the hydrogen circulation pump, reduce the cost and reduce the difficulty of processing.

[0048] A motor 21 is provided in the motor housing 2, and the active rotor shaft 13 extends into the motor housing 2 and cooperates with the motor 21 in transmission; the active rotor 15 and the driven rotor 16 are both mutually cooperating Roots-type rotors, which are provided with two-leaf Roots blades; a base 19 is provided at the bottom of the rotor housing 1, and an air inlet 110 and an exhaust port 111 connected to the rotor cavity 12 are provided at the bottom of the base 19.

[0049] The side of the rotor housing 1 corresponding to the gear chamber 11 is provided with an oil filling port. The gear chamber 11 is provided with a first bearing 112 and a second bearing 113 that match the driving rotor shaft 13 and the driven rotor shaft 14; the driving rotor shaft 13 and the driven rotor shaft 14 are supported and fixed in position by the first bearing 112 and the second bearing 113, so that the rotor shaft runs more smoothly and effectively transmits the torque of the motor 21. The first bearing 112 and the second bearing 113 are lubricated by the lubricating oil in the gear chamber 11.

[0050] The portion of the active rotor shaft 13 located between the gear chamber 11 and the rotor chamber 12 and the portion of the driven rotor shaft 14 located between the gear chamber 11 and the rotor chamber 12 are both provided with a first seal 3 to prevent the lubricating oil in the gear chamber 11 from leaking into the rotor chamber to contaminate the hydrogen and reduce the purity of the hydrogen, and the hydrogen in the rotor chamber from leaking into the gear chamber 11 to reduce the working performance of the hydrogen pump.

[0051] A second seal 4 is provided on the active rotor shaft 13 between the gear chamber 11 and the motor housing 2 to prevent the lubricating oil in the gear chamber 11 from leaking into the motor housing 2 and corroding the winding insulation components of the motor 21, thereby causing a short circuit and burning the motor 21.

[0052] A rear end cover 5 is provided on one side of the rotor housing 1, and the rear end cover 5 is opposite to the rotor cavity 12; a first fastener 6 is provided on the rear end cover 5, and the first fastener 6 connects the rear end cover 5 and the rotor housing 1. A clearance groove 51 is provided on the rear end cover 5 corresponding to one end of the active rotor shaft 13 and one end of the driven rotor shaft 14; one end of the active rotor shaft 13 and the driven rotor shaft 14 extends to the corresponding clearance groove 51.

[0053] A third seal 7 is provided at the portion where the rear end cover 5 abuts against the rotor housing 1 to prevent the compressed hydrogen in the rotor cavity 12 from leaking into the environment through the gap between the rear end cover 5 and the rotor housing 1 and causing unsafe factors.

[0054] A motor 21 connecting plate is provided between the rotor housing 1 and the motor housing 2; the motor 21 connecting plate is opposite to the gear chamber 11; a second fastener 9 is provided on the motor 21 connecting plate, and the second fastener 9 connects the motor 21 connecting plate and the rotor housing 1; a third fastener 10 is provided on the motor housing 2, and the third fastener 10 connects the motor housing 2 and the motor 21 connecting plate. Specifically, a mounting groove 81 is provided on the motor 21 connecting plate, and the motor housing 2 is docked in the mounting groove 81. A limit baffle 22 is provided on the periphery of the motor housing 2, and the limit baffle 22 abuts against the mounting groove 81 and is connected to the motor 21 connecting plate through the third fastener 10.

[0055] A fourth seal 101 is provided at the portion where the connecting plate of the motor 21 abuts against the rotor housing 1 to prevent the compressed hydrogen in the rotor cavity 12 from leaking into the environment and causing unsafe factors, and the lubricating oil in the gear chamber 11 from leaking into the environment and causing pollution.

[0056] The portion of the motor housing 2 that abuts against the inner wall of the mounting groove 81 is provided with a fifth seal 102 to prevent the compressed hydrogen in the rotor cavity 12 or the lubricating oil in the gear chamber 11 from leaking into the motor housing 2 through the component matching clearance and leaking from the motor housing 2 into the environment, causing unsafe factors.

[0057] Working principle: When in use, the motor 21 drives the driving rotor 15 transmission shaft and the driving rotor 15 to rotate, and the driving gear 17 and the driven gear 18 cooperate to simultaneously drive the driven rotor 16 transmission shaft and the driven rotor 16 to rotate; with the cooperation of the two Roots-type rotors of the driving rotor 15 and the driven rotor 16, the excess hydrogen can be drawn from the air inlet 110 into the rotor cavity 12 and discharged from the exhaust port 111 for recycling.

[0058] By designing multiple seals, including a first seal 3 provided on a portion of the active rotor shaft 13 between the gear chamber 11 and the rotor chamber 12 and a portion of the driven rotor shaft 14 between the gear chamber 11 and the rotor chamber 12, a second seal 4 provided on a portion of the active rotor shaft 13 between the gear chamber 11 and the motor housing 2, a third seal 7 provided on a portion where the rear end cover 5 abuts against the rotor housing 1, a fourth seal 101 provided on a portion where the connecting plate of the motor 21 abuts against the rotor housing 1, and a fifth seal 102 provided on a portion where the motor housing 2 abuts against the inner wall of the mounting groove 81, high-reliability operation is achieved to avoid leakage of compressed hydrogen or lubricating oil.

[0059] In summary, the Roots-type hydrogen circulation pump provided by the utility model drives the active rotor transmission shaft and the active rotor to rotate through a motor, and the cooperation of the active gear and the driven gear simultaneously drives the driven rotor transmission shaft and the driven rotor to rotate; with the cooperation of the two Roots-type rotors of the active rotor and the driven rotor, it is possible to draw excess hydrogen from the air inlet into the rotor cavity and discharge it out of the exhaust port for recycling; a Roots-type rotor structure is adopted, which has a simple structure, strong pressure bearing capacity and high reliability; a two-leaf Roots blade design is adopted to increase the effective volume of the hydrogen circulation pump; at the same time, the air inlet and the exhaust port of the base and the bottom of the base are arranged on the same side, which is more convenient for the arrangement of pipelines than the different-side arrangement of conventional hydrogen circulation pumps, and at the same time, the air inlet and the exhaust port can utilize the bottom space of the rotor shell to reduce the occupied volume.

[0060] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A Roots-type hydrogen circulation pump, characterized in that: It comprises a rotor housing and a motor housing, wherein a gear chamber and a rotor cavity are sequentially arranged in the rotor housing along the length direction thereof, and a driving rotor shaft and a driven rotor shaft are arranged in the rotor housing; one end of the driving rotor shaft in the rotor cavity is provided with a driving rotor, and one end in the gear chamber is provided with a driving gear; one end of the driven rotor shaft in the rotor cavity is provided with a driven rotor, and one end in the gear chamber is provided with a driven gear; the driving gear is meshed with the driven gear; a motor is arranged in the motor housing, and the driving rotor shaft extends into the motor housing to cooperate with the motor transmission; the driving rotor and the driven rotor are both mutually matched Roots-type rotors, which are provided with two-leaf Roots blades; a base is arranged at the bottom of the rotor housing, and an air inlet and an exhaust port communicated with the rotor cavity are arranged at the bottom of the base.

2. The Roots-type hydrogen circulation pump according to claim 1, characterized in that: A first sealing member is provided on a portion of the driving rotor shaft between the gear chamber and the rotor chamber and a portion of the driven rotor shaft between the gear chamber and the rotor chamber.

3. The Roots-type hydrogen circulation pump according to claim 1, characterized in that: A second sealing member is provided on the portion of the active rotor shaft between the gear chamber and the motor housing.

4. The Roots-type hydrogen circulation pump according to claim 1, characterized in that: A rear end cover is provided on one side of the rotor housing, and the rear end cover is opposite to the rotor cavity; a first fastener is provided on the rear end cover, and the first fastener connects the rear end cover and the rotor housing.

5. The Roots-type hydrogen circulation pump according to claim 4, characterized in that: A third sealing member is provided at the portion where the rear end cover abuts against the rotor housing.

6. The Roots-type hydrogen circulation pump according to claim 4, characterized in that: The rear end cover is provided with a clearance groove corresponding to one end of the driving rotor shaft and one end of the driven rotor shaft; one end of the driving rotor shaft and the driven rotor shaft extends to the corresponding clearance groove.

7. The Roots-type hydrogen circulation pump according to claim 1, characterized in that: A motor connecting plate is provided between the rotor housing and the motor housing; the motor connecting plate is opposite to the gear chamber; a second fastener is provided on the motor connecting plate, and the second fastener connects the motor connecting plate and the rotor housing; a third fastener is provided on the motor housing, and the third fastener connects the motor housing and the motor connecting plate.

8. The Roots-type hydrogen circulation pump according to claim 7, characterized in that: A fourth sealing member is provided at the portion where the motor connecting plate abuts against the rotor housing.

9. The Roots-type hydrogen circulation pump according to claim 7, characterized in that: The motor connecting plate is provided with a mounting groove, the motor housing is docked in the mounting groove, and a limit baffle is provided on the periphery of the motor housing. The limit baffle abuts against the mounting groove and is connected to the motor connecting plate through a third fastener.

10. The Roots-type hydrogen circulation pump according to claim 9, characterized in that: A fifth sealing member is provided at the portion of the motor housing that abuts against the inner wall of the mounting groove.

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