Motor for driving hydrogen circulating pump of fuel cell

Abstract

A motor for driving a fuel cell hydrogen circulating pump comprises a pump body and a motor, a pump shell of the pump body is fixedly connected with a motor shell, the motor is an axial magnetic flux motor, a stator of the axial magnetic flux motor is fixedly connected with the motor shell, and a partition plate is arranged at the end, adjacent to the pump body, of the motor shell. The motor stator is sealed in the motor shell through the partition plate, the pump body comprises a pump shaft and an impeller, the pump shaft and the pump shell are fixedly connected to form a fixed shaft, a rotatable bearing seat is supported on the pump shaft through a bearing, the impeller is fixedly connected with the bearing seat and located in the pump shell, and the end, opposite to the motor, of the impeller is fixedly connected with a magnetic disc seat. A plurality of axial magnetic flux magnetic blocks are arranged in the magnetic disk seat, the plurality of axial magnetic flux magnetic blocks are respectively separated by magnetic disk spacing blocks, the axial magnetic flux magnetic blocks comprise N-pole magnetic blocks and S-pole magnetic blocks, the N-pole magnetic blocks and the S-pole magnetic blocks are alternately arranged, and the axial magnetic flux magnetic blocks are coupled with an alternating magnetic field of the stator to drive the impeller to rotate.

Description

TECHNICAL FIELD

[0001] The utility model belongs to new energy technology field especially, it is a kind of motor of driving fuel cell hydrogen circulating pump. BACKGROUND

[0002] Fuel cell is through hydrogen and oxygen in air between electrochemical reaction generates electric energy, fuel cell reaction, the gas containing a large amount of hydrogen is discharged, these hydrogen is directly discharged into atmosphere, will cause energy waste and environmental pollution, and hydrogen is flammable and explosive can produce danger.Therefore need to be driven by motor hydrogen circulating pump and recycle these hydrogen back to fuel cell for recycling.

[0003] Reference Figure 1 , the motor shaft 20 of current hydrogen circulating pump one end is arranged in motor casing 2, the other end extends into pump shell 1, and with the impeller 5 in pump shell 1 circumferential fixed connection, to prevent hydrogen penetration into motor, and the safety hidden danger such as fire and explosion of electric winding, usually set up oil seal 21 between pump shell 1 and motor casing 2, the outer wall of oil seal 21 has the inner wall interference fit of motor casing 2, oil seal 21 and motor shaft 20 rotating friction seal, but oil seal 21 can cause the greater friction loss between motor shaft 20 and motor casing 2, lead to motor efficiency reduction, and long time operation after oil seal piece long-term friction produces abrasion, cause sealing failure, lead to safety hidden trouble. SUMMARY

[0004] The utility model discloses to solve the technical problem in the prior art, propose a kind of motor of driving fuel cell hydrogen circulating pump, the motor is axial flux motor, the one end of motor casing and pump body is adjacent and is provided with baffle, the baffle separates motor stator and hydrogen pump body, and is sealed with the sealing ring with motor casing inner wall static seal, compared with the friction loss of dynamic sealing structure of prior art, can effectively prevent the penetration of hydrogen, improve safety performance.

[0005] The utility model discloses to solve the technical problem in the prior art, propose a kind of motor of driving fuel cell hydrogen circulating pump, the motor is axial flux motor, the one end of motor casing and pump body is adjacent and is provided with baffle, the baffle separates motor stator and hydrogen pump body, and is sealed with the sealing ring with motor casing inner wall static seal, compared with the friction loss of dynamic sealing structure of prior art, can effectively prevent the penetration of hydrogen, improve safety performance.

[0006] The utility model provides a kind of motor of driving fuel cell hydrogen circulating pump, including pump body, motor, the pump shell of pump body is connected with motor casing fixed, the motor is axial flux motor, the stator of axial flux motor is fixedly connected with motor casing, the end of motor casing is adjacent with pump body and is provided with baffle, motor stator is sealed in motor casing by baffle, the pump body includes pump shaft, impeller, the pump shaft is fixedly connected with pump shell and forms fixed shaft, rotatable bearing seat is supported on the pump shaft by bearing, the impeller is fixedly connected with bearing seat and is located in pump shell, the end of impeller and motor is fixedly connected with a magnetic disk seat, a plurality of axial flux magnetic blocks are provided in the magnetic disk seat, a plurality of axial flux magnetic blocks are separated by magnetic disk spacing block, the axial flux magnetic block includes N pole magnetic block, S pole magnetic block, N pole magnetic block, S pole magnetic block are alternately arranged, the axial flux magnetic block and stator alternate field coupling, drive impeller rotation.

[0007] Further, the motor casing extends radially inwardly to a first flange, and the core of the stator is fixedly connected to the first flange by bolts.

[0008] Further, the motor further comprises a motor rear cover, the motor casing is fixedly connected to the motor rear cover by bolts, the motor rear cover is provided with an axially extending extension, and the outer wall of the extension is sealed to the inner wall of the motor casing by a sealing ring.

[0009] Further, the motor casing is provided with a stepped shaft hole, the end surface of the baffle abuts against the shoulder of the large-diameter section of the stepped shaft hole, the outer wall of the baffle is sealed to the inner wall of the large-diameter section of the stepped hole by a sealing ring, and the outer wall of the motor casing is sealed to the inner wall of the pump shell by a sealing ring.

[0010] Further, the outer wall of the bearing seat extends radially to a second flange, and the impeller is fixedly connected to the bearing seat by the second flange.

[0011] Further, the magnetic disk seat is provided with a mounting groove, the axial flux magnetic blocks and the magnetic disk spacing blocks are arranged in the mounting groove, one end surface of the axial flux magnetic blocks is fixedly bonded to the groove bottom of the mounting groove, and the other end surface of the axial flux magnetic blocks is fixedly bonded to a magnetic disk closure plate.

[0012] Further, the baffle is made of a material that is not magnetically conductive and not electrically conductive.

[0013] Further, the axial flux magnetic blocks are designed as inclined poles.

[0014] The motor of driving fuel cell hydrogen circulating pump of the utility model, the motor is axial flux motor, axial flux magnetic block is equivalent to rotor and is arranged in the inner cavity of pump shell, the inner cavity of pump shell is separated from motor by baffle, the baffle adopts static sealing mode, effectively prevents hydrogen permeation, and safety performance is improved.

[0015] The utility model is further described below in combination with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the prior art.

[0017] Figure 2 It is a structural schematic diagram of the utility model.

[0018] Figure 3 It is an assembly view of the magnetic disk seat and the axial flux magnetic block of the utility model.

[0019] Figure 4 It is Figure 3 A-A sectional view.

[0020] Figure 5 It is an axonometric view of the stator of the utility model.

[0021] Brief description of the drawings: pump shell 1, motor housing 2, partition 3, pump shaft 4, impeller 5, bearing seat 6, magnetic disk seat 7, axial flux magnetic block 8, magnetic disk spacing block 9, first flange 10, iron core 11, motor rear cover 12, extension 13, sealing ring 14, hole shoulder 15, second flange 16, magnetic disk closure plate 17, insulating paper 18, iron core auxiliary groove 19, motor shaft 20, oil seal 21, winding 22, winding potting glue 23. DETAILED DESCRIPTION

[0022] Referring to Figures 2 to 4 A motor for driving a hydrogen circulation pump of a fuel cell comprises a pump body and a motor, the pump shell 1 of the pump body is connected with the motor housing 2 through a stop opening and bolts, and the outer wall of the motor housing 2 is sealed with the inner wall of the pump shell 1 through a sealing ring 14 to prevent hydrogen leakage.

[0023] The motor is an axial flux motor, and compared with a radial flux motor, the axial flux motor has higher power density, smaller volume and lighter mass under the same power, and has more competitive advantages. The stator of the axial flux motor is fixedly connected with the motor housing 2, and in the embodiment, the motor housing 2 extends radially to the inner wall by a first flange 10, and the iron core 11 of the stator is fixedly connected with the first flange 10 through bolts.

[0024] Referring to Figure 5 The stator of the motor comprises a winding 22 and an iron core 11, the stator is sealed through potting glue 23, insulating paper 18 is arranged between the winding 22 and the iron core 11, and an iron core auxiliary groove 19 is arranged on one end surface of the iron core 11 to optimize the cogging torque.

[0025] The motor housing 2 is provided with a partition plate 3 adjacent to the pump body, the material of the partition plate 3 is non-magnetic and non-conductive. The motor stator is sealed in the motor housing 2 by the partition plate 3. In this embodiment, the motor housing 2 is provided with a stepped shaft hole, the end surface of the partition plate 3 abuts against the hole shoulder 15 of the large diameter section of the stepped shaft hole, and the outer wall of the partition plate 3 is sealed with the inner wall of the large diameter section of the stepped hole by a sealing ring 14. The static sealing manner between the partition plate 3 and the inner wall of the motor housing 2 has no friction loss, has good sealing effect, effectively prevents hydrogen leakage to the motor stator, and reduces the safety hazard.

[0026] The pump body includes a pump shaft 4 and an impeller 5. The pump shaft 4 is fixedly connected with the pump shell 1 to form a fixed shaft. A rotatable bearing seat 6 is supported on the pump shaft 4 by a bearing. The impeller 5 is fixedly connected with the bearing seat 6 and located in the pump shell 1. In this embodiment, the outer wall of the bearing seat 6 extends radially to form a second flange 16, and the impeller 5 is fixedly connected with the bearing seat 6 by the second flange 16. One end of the impeller 5 facing the motor is fixedly connected with a magnetic disk seat 7, and the bearing seat 6, the impeller 5 and the magnetic disk seat 7 are fixed by bolts. The magnetic disk seat 7 is provided with a mounting groove, and a plurality of axial flux magnetic blocks 8 are fixedly bonded in the mounting groove. One end surface of the axial flux magnetic block 8 is fixedly bonded with the groove bottom of the mounting groove, and the plurality of axial flux magnetic blocks 8 are uniformly separated by magnetic disk spacing blocks 9. The axial flux magnetic block 8 includes N-pole magnetic blocks and S-pole magnetic blocks, which are arranged alternately. The axial flux magnetic block 8 is coupled with the alternating magnetic field of the stator to drive the impeller 5 to rotate. The other end surface of the axial flux magnetic block 8 is fixedly bonded with a magnetic disk sealing plate 17, which completely seals the axial flux magnetic block 8 in the magnetic disk seat 7, effectively preventing the corrosion of the hydrogen environment to the axial flux magnetic block 8. The axial flux magnetic block 8 is designed with an inclined pole, which can optimize the cogging torque.

[0027] The motor rear cover 12 is also included, the motor housing 2 and the motor rear cover 12 are fixedly connected by bolts, the motor rear cover 12 is provided with an axially extending extension 13, and the outer wall of the extension 13 is sealed with the inner wall of the motor housing 2 by a sealing ring 14. The motor rear cover 12 is provided with a mounting hole for the motor phase line, and a phase line sealing sleeve is arranged between the motor phase line and the mounting hole. One end of the motor phase line is connected with the winding 22, and the other end is connected with the controller, thereby providing the stator with alternating current to form the stator alternating magnetic field.

[0028] The utility model discloses a motor of driving fuel cell hydrogen circulating pump adopts axial flux motor, and power density is higher, and the volume of axial flux motor is smaller under the same power, and the quality is lighter, and it is more competitive advantage, set up multiple sealing structure between motor casing 2 and pump shell 1, between baffle 3 and motor casing 2, between motor rear cover 12 and motor casing 2, effectively prevent hydrogen leakage to atmosphere or in motor, protect the environment, and high safety, baffle 3 adopts static seal's mode, relative to the friction loss of prior art dynamic seal structure, and safety greatly improves, winding 22 adopts the closed structure of filling seal, also greatly improved the service life and safety of motor, axial flux magnetic block 8 skew pole design and the core auxiliary groove 19 structure of core 11 design, effectively reduced the torque ripple and high speed vibration of axial flux motor.

[0029] The above is only the preferred embodiment of the utility model, and is not used for limiting the utility model, and the person skilled in the art makes the change to the utility model without departing from the spirit of the utility model, and all fall into the protection scope of the utility model.

Claims

1. A motor for driving a hydrogen circulation pump of a fuel cell, comprising a pump body and a motor, a pump shell (1) of the pump body is connected and fixed with a motor shell (2), characterized in that: The motor is an axial flux motor, the stator of the axial flux motor is fixedly connected with the motor shell (2), one end of the motor shell (2) adjacent to the pump body is provided with a partition plate (3), the motor stator is sealed in the motor shell (2) through the partition plate (3), the pump body comprises a pump shaft (4) and an impeller (5), the pump shaft (4) is fixedly connected with the pump shell (1) to form a fixed shaft, a rotatable bearing seat (6) is supported on the pump shaft (4) through a bearing, the impeller (5) is fixedly connected with the bearing seat (6) and located in the pump shell (1), one end of the impeller (5) opposite to the motor is fixedly connected with a magnetic disk seat (7), a plurality of axial flux magnetic blocks (8) are arranged in the magnetic disk seat (7), the plurality of axial flux magnetic blocks (8) are separated by magnetic disk spacing blocks (9), the axial flux magnetic blocks (8) comprise N-pole magnetic blocks and S-pole magnetic blocks, the N-pole magnetic blocks and the S-pole magnetic blocks are alternately arranged, the axial flux magnetic blocks (8) are coupled with an alternating magnetic field of the stator to drive the impeller (5) to rotate.

2. The electric motor driving a hydrogen circulation pump of a fuel cell according to claim 1, characterized by: The motor shell (2) extends radially towards the inner wall to form a first flange (10), and the core (11) of the stator is fixedly connected with the first flange (10) through bolts.

3. The electric motor driving a hydrogen circulation pump of a fuel cell according to claim 1, characterized by: The motor also comprises a motor rear cover (12), the motor shell (2) is fixedly connected with the motor rear cover (12) through bolts, the motor rear cover (12) is provided with an axially extending extension (13), and the outer wall of the extension (13) is sealed with the inner wall of the motor shell (2) through a sealing ring (14).

4. The electric motor driving a hydrogen circulation pump of a fuel cell according to claim 1, characterized by: The motor shell (2) is provided with a stepped shaft hole, the end surface of the partition plate (3) abuts against the hole shoulder (15) of the large-diameter section of the stepped shaft hole, the outer wall of the partition plate (3) is sealed with the inner wall of the large-diameter section of the stepped hole through a sealing ring (14), and the outer wall of the motor shell (2) is sealed with the inner wall of the pump shell (1) through a sealing ring (14).

5. The electric motor driving a hydrogen circulation pump of a fuel cell according to claim 1, characterized by: The outer wall of the bearing seat (6) extends radially to form a second flange (16), and the impeller (5) is fixedly connected with the bearing seat (6) through the second flange (16).

6. The electric motor driving a hydrogen circulation pump of a fuel cell according to claim 1, characterized by: The magnetic disk seat (7) is provided with a mounting groove, the axial flux magnetic blocks (8) and the magnetic disk spacing blocks (9) are arranged in the mounting groove, one end surface of the axial flux magnetic blocks (8) is fixedly bonded with the groove bottom of the mounting groove, and the other end surface of the axial flux magnetic blocks (8) is fixedly bonded with a magnetic disk closure plate (17).

7. The electric motor driving a hydrogen circulation pump of a fuel cell according to claim 1, characterized by: The material of the partition plate (3) is non-magnetic and non-conductive.

8. The electric motor driving a hydrogen circulation pump of a fuel cell according to claim 1, characterized by: The axial flux magnetic blocks (8) are designed as inclined poles.

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