New circulation pump for hydrogen fuel cell system

Abstract

The invention discloses a novel circulating pump for a hydrogen fuel cell system, comprising an impeller shaft, an impeller, a wind shield, a stator part, and a rotor part. The impeller shaft is arranged in the wind shield, an impeller bracket is arranged on the impeller shaft, the impeller is sleeved on the impeller bracket, a rotor part is also arranged on the impeller bracket, and the stator part is arranged on one side of the rotor part. The rotor part and the stator part are isolated by a motor front end cover, and the motor front end cover is connected to the wind shield. The novel circulating pump for a hydrogen fuel cell system of the invention isolates the motor stator part and the rotor part by the motor front end cover, and only the rotor part runs in a hydrogen environment, blocking and isolating the possible leaked hydrogen from entering the stator part, and preventing the hydrogen and water vapor from corroding and damaging the stator iron core and the stator coil.

Description

Technical Field

[0001] The invention relates to a hydrogen circulation pump of a hydrogen fuel cell system using a high-speed motor, belonging to the technical field of new energy automobile parts. Background Art

[0002] Hydrogen fuel cells transport hydrogen and oxygen to the stack to generate electricity, converting chemical energy directly into electrical energy. In this process, hydrogen and oxygen do not react completely, and some hydrogen remains in the exhaust gas after the reaction. If it is discharged directly into the air, it will cause energy waste and reduce the efficiency of the reactor, so it is necessary to recover the hydrogen. This process uses a hydrogen circulation pump to pump the exhaust gas back to the stack air inlet for further reaction and utilization. Since hydrogen is a flammable and explosive dangerous gas, and has a hydrogen embrittlement effect on many metals, a specially structured hydrogen circulation pump is required to ensure reliable operation and no leakage during the hydrogen recovery process. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a pump structure which can operate safely in a hydrogen environment and in which a pump impeller and a motor stator are isolated from each other.

[0004] The technical solution of the present invention is:

[0005] A novel circulating pump for a hydrogen fuel cell system comprises an impeller shaft, an impeller, a hood, a stator part and a rotor part. The impeller shaft is arranged in the hood, an impeller bracket is arranged on the impeller shaft, the impeller sleeve is arranged on the impeller bracket, a rotor part is also arranged on the impeller bracket, the stator part is arranged on one side of the rotor part, the rotor part and the stator part are isolated by a motor front end cover, and the motor front end cover is connected to the hood.

[0006] The rotor part comprises a rotor magnetic sheet sleeved on the impeller support, and a magnetic sheet outer cover is arranged on the rotor magnetic sheet.

[0007] The stator part comprises a stator core and a stator frame arranged on the stator core, and a stator winding is arranged on the stator frame.

[0008] A housing is arranged on the outer ring of the stator part.

[0009] A motor drive assembly is disposed on the other side of the stator portion.

[0010] The motor drive assembly comprises a motor drive board, and the lead connector assembly and the stator winding are respectively connected to the motor drive board.

[0011] The impeller shaft and the impeller bracket are connected via a rolling bearing.

[0012] The outer ring of the stator part is provided with a casing.

[0013] A rear end cover is provided between the stator part and the motor drive assembly.

[0014] The technical advances achieved by the present invention are as follows.

[0015] The novel circulating pump motor of the hydrogen fuel cell system of the present invention isolates the stator part and the rotor part of the motor through an isolation cover, and only the rotor part operates in a hydrogen environment, blocking and isolating the possible leaked hydrogen from entering the stator part, and preventing hydrogen and water vapor from corroding and damaging the stator iron core and the stator coil. In addition, the impeller, impeller shaft and rotor part are made of hydrogen embrittlement resistant materials, and the rotor magnetic sheet is sealed with glue on the mating surface of the impeller bracket and the magnetic sheet outer cover, which can prevent hydrogen and water vapor from corroding the impeller shaft, rolling bearings and rotor magnetic sheets, thereby ensuring long-term reliable operation of the hydrogen circulating pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] Figure 2 for Figure 1 Exploded diagram.

[0018] In the figure: 1—wind cover, 2—impeller shaft, 3—impeller bushing, 4—fixing screw, 5—impeller, 6—impeller bracket, 7—rolling bearing, 8—bearing gasket, 9—rotor magnetic sheet, 10—magnetic sheet outer cover, 11—O-ring, 12—fixing nut, 13—motor front end cover, 14—motor stator core, 15—stator frame, 16—stator winding, 17—screw, 18—O-ring, 19—casing, 20—rear end cover, 21—screw, 22—bracket, 23—rear cover seal, 24—fixing screw, 25—motor drive board, 26—rear cover, 27—screw, 28—waterproof connector, 29—lead connector assembly. DETAILED DESCRIPTION

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific examples.

[0020] A novel circulating pump for a hydrogen fuel cell system comprises an impeller shaft 2, an impeller 5, a fan 1, a stator part and a rotor part. The impeller shaft 2 is arranged in the fan 1, an impeller bracket 6 is arranged on the impeller shaft 2, the impeller 5 is sleeved on the impeller bracket 6, a rotor part is also arranged on the impeller bracket 6, the stator part is arranged on one side of the rotor part, the rotor part and the stator part are isolated by a motor front end cover 13, and the motor front end cover 13 is connected to the fan 1.

[0021] The rotor part comprises a rotor magnetic sheet 9 sleeved on the impeller support 6 , and a magnetic sheet cover 10 is provided on the rotor magnetic sheet 9 .

[0022] The stator part includes a stator core 14 and a stator frame 15 arranged on the stator core 14 . A stator winding 16 is arranged on the stator frame 15 .

[0023] An organic housing 19 is arranged on the outer ring of the stator part.

[0024] A motor drive assembly is disposed on the other side of the stator portion.

[0025] The motor drive assembly includes a motor drive board 25 , to which a lead connector assembly 29 and a stator winding 16 are respectively connected.

[0026] The impeller shaft 2 and the impeller support 6 are connected via a rolling bearing 7 .

[0027] The outer ring of the stator part is provided with a housing 19 .

[0028] A rear end cover 20 is provided between the stator portion and the motor drive assembly.

[0029] During installation, the rotor magnetic sheet 9 is evenly glued to the impeller bracket 6 with glue, and then covered with the magnetic sheet cover 10, and glue is applied to the inner and outer circles of the magnetic sheet cover 10 to ensure that the rotor magnetic sheet 9 is in a sealed environment and is not corroded during the operation of the motor. The impeller shaft 2 is fixed to the wind cover 1, and the impeller 5 is fixed to the impeller bracket 6 by the fixing screws 4. Two rolling bearings 7 are installed in the impeller bracket 6, separated by a bearing gasket 8 in the middle, and then the impeller bracket 6 with two rolling bearings 7 is pressed into the impeller shaft 2, and the rolling bearings 7 are locked with the fixing nut 12 to ensure that the impeller does not move axially during operation. The stator frame 15 is installed on the stator core 14, the enameled wire is wound around the stator frame 15, and three leads are connected to form a stator winding 16. The stator winding assembly is pressed into the housing 19, and the stator winding is sealed in the housing 19 with a heat-conducting potting glue, which can protect the winding and enhance the heat dissipation effect of the stator winding 16 during operation. The O-ring 18 is inserted into the stopper of the front end cover 13 and the rear end cover 20 of the motor, and is installed in alignment with the inner ring of the housing. The front end cover 13, the rear end cover 20 and the housing 19 of the motor are tightened together with the screw 21 to form the motor body. The bracket 22 is fixed to the rear end cover 20 with the fixing screw 24, and then the rear cover sealing ring 23 is sleeved on the bracket 22. The three leads from the stator winding are connected to the motor drive board 25 with solder, and the lead connector assembly 29 is also soldered to the motor drive board 25, and then installed in the rear cover 26, and the rear cover 26 is locked and connected with the bracket 22 with the screw 27. Inject the heat-conducting potting glue into the cavity of the rear cover 26 through the lead hole of the rear cover, so that the heat of the motor drive board during operation can be more quickly conducted out, and then align the waterproof connector 28 with the lead hole of the rear cover 26 and tighten the thread to complete the assembly of the motor stator drive board assembly. Put the O-ring 11 into the sealing ring groove of the wind cover 1, align the shaft hole of the motor front cover 13 in the motor stator drive board assembly with the impeller shaft 2 on the wind cover 1 and the threaded holes of both, and finally tighten with screws 17 to complete the assembly of the entire hydrogen circulation pump.

[0030] The hydrogen circulation pump isolates the stator part and the rotor part of the motor through the front cover 13, and only the impeller shaft 2, the impeller liner 3, the fixing screw 4, the impeller 5, the impeller bracket 6, the rolling bearing 7, the bearing washer 8, the rotor magnetic sheet 9, and the magnetic sheet outer cover 10 operate in the hydrogen environment. The impeller shaft 2, the impeller liner 3, the fixing screw 4, the impeller 5, the impeller bracket 6, the rolling bearing 7, the bearing washer 8, the rotor magnetic sheet 9, and the magnetic sheet outer cover 10 are made of anti-hydrogen embrittlement materials, which can operate for a long time in the environment of hydrogen and high humidity mixed gas without the tensile and compressive strength decaying, and without rusting. The rotor magnetic sheet 9 can prevent contact with hydrogen and water vapor through the glue sealing of the mating surface of the impeller bracket 6 and the magnetic sheet outer cover 10, prevent rust and corrosion, and avoid the motor performance degradation after long-term operation. The front cover 13 is made of high-strength and high-temperature-resistant plastic, which can work for a long time in a high-temperature and high-humidity environment without deformation. The motor stator core 14, stator frame 15, and stator winding 16 are isolated from hydrogen by the front cover 13, and are sealed in the housing 19 with heat-conducting potting glue, and the sealing ring 18 is used to seal the matching surface of the housing 4, the front cover 13, and the rear cover 20 to ensure that the stator reaches the dust and water resistance level of IP67. The motor drive board 25 is installed in the closed cavity formed by the rear cover 27, the bracket 22, and the rear cover sealing ring 23, and is potted with heat-conducting silicone, which can conduct heat and prevent shock. Through the above structural design, the circulation pump can operate reliably in the hydrogen fuel cell system and reach the dust and water resistance level of IP67.

Claims

1. A novel circulating pump for a hydrogen fuel cell system, comprising an impeller shaft (2), an impeller (5), a fan cover (1), a stator part, and a rotor part, characterized in that: An impeller shaft (2) is arranged in the wind cover (1), an impeller bracket (6) is arranged on the impeller shaft (2), an impeller (5) is sleeved on the impeller bracket (6), a rotor part is also arranged on the impeller bracket (6), a stator part is arranged on one side of the rotor part, the rotor part and the stator part are isolated by a motor front end cover (13), and the motor front end cover (13) is connected to the wind cover (1); The rotor part comprises a rotor magnetic sheet (9) sleeved on an impeller support (6), and a magnetic sheet outer cover (10) is provided on the rotor magnetic sheet (9); The stator part comprises a stator core (14), a stator frame (15) arranged on the stator core (14), and a stator winding (16) is arranged on the stator frame (15); An organic shell (19) is provided on the outer ring of the stator part; A motor drive assembly is disposed on the other side of the stator part.

2. The novel circulating pump for hydrogen fuel cell system according to claim 1, characterized in that: The motor drive assembly comprises a motor drive board (25), to which a lead connector assembly (29) and a stator winding (16) are respectively connected.

3. The novel circulating pump for hydrogen fuel cell system according to claim 1, characterized in that: The impeller shaft (2) and the impeller support (6) are connected via a rolling bearing (7).

4. The novel circulating pump for hydrogen fuel cell system according to claim 1, characterized in that: The outer ring of the stator part is provided with a housing (19).

5. The novel circulating pump for hydrogen fuel cell system according to claim 1, characterized in that: A rear end cover (20) is provided between the stator part and the motor drive assembly.

Images