A method for preventing leakage of hydrogen circulation pump for fuel cell system

Abstract

The present invention relates to the field of fuel cell technology, and in particular to a method for preventing leakage of a hydrogen circulation pump for a fuel cell system. The method comprises a motor housing and a pump housing, and a bearing seat therebetween. A driving shaft and a driven shaft are arranged in the pump housing. The driving shaft extends into a gear chamber and is connected to a driving gear. The driven shaft extends into the gear chamber and is connected to a driven gear. A driving rotor is installed on the driving shaft. A driven rotor is installed on the driven shaft. An air inlet and an air outlet are arranged on the pump housing. The bearing seat is insulated from the motor housing. The motor shaft extends into the gear chamber and is connected to the driving gear through an insulating connection structure. The internal and external connection positions between the pump head and the motor can be completely insulated. Even after part of the current of the fuel cell system is connected to the pump head, it will no longer be transmitted to the motor through the pump head, thereby preventing the current from being introduced into the ground through the grounding wire of the motor and being lost through the earth, thereby avoiding the current loss of the fuel cell system and achieving the purpose of energy saving.

Description

Technical field:

[0001] The present invention relates to the technical field of fuel cells, and in particular to a method for preventing leakage of a hydrogen circulation pump used in a fuel cell system. Background technology:

[0002] The hydrogen circulation pump is mainly used to pressurize and reuse the hydrogen-containing mixed gas discharged from the fuel cell system. During the operation of the hydrogen circulation pump, since the hydrogen-containing mixed gas contains water vapor, part of the current of the fuel cell system will be connected to the pump head of the hydrogen circulation pump along with the water vapor. Since the pump head is connected to the motor, and the motor is connected to a ground wire, part of the current of the fuel cell system will be introduced into the underground through the water vapor, the pump head, and the motor, and lost through the earth, thereby causing current loss in the fuel cell system and resulting in energy waste. Currently, there is no good way to solve the above problems.

[0003] Therefore, the problem of current loss in the fuel cell system through the hydrogen circulation pump has become a technical problem that urgently needs to be solved in the industry. Summary of the invention:

[0004] In order to make up for the deficiencies of the prior art, the present invention provides a method for preventing leakage of a hydrogen circulation pump for a fuel cell system, which solves the problem of current loss in the fuel cell system caused by the current being introduced into the ground through the hydrogen circulation pump.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] A method for preventing leakage of a hydrogen circulation pump for a fuel cell system is disclosed. An insulating structure is provided between a motor and a pump head of the hydrogen circulation pump. The insulating structure includes an insulating structure provided between a motor housing and a pump housing, and an insulating structure provided between a motor shaft and a driving shaft of the pump head. Thus, the internal and external connection positions between the pump head and the motor are completely insulated. The current introduced into the pump head by the fuel cell system along with water vapor will no longer be transmitted to the motor, thereby preventing the current from being introduced into the earth through the grounding wire of the motor and being lost.

[0007] The hydrogen circulation pump comprises a motor housing and a pump housing, and a bearing seat therebetween; a gear chamber is provided between the bearing seat and the motor housing; a stator, a rotor and a motor shaft are arranged in the motor housing; a meshing driving gear and a driven gear are arranged in the gear chamber; a driving shaft and a driven shaft are arranged in the pump housing; the driving shaft extends into the gear chamber and is connected to the driving gear; the driven shaft extends into the gear chamber and is connected to the driven gear; a driving rotor is mounted on the driving shaft; a driven rotor is mounted on the driven shaft; and an air inlet and an air outlet are provided on the pump housing.

[0008] The bearing seat is connected to the motor housing through a plurality of long bolts, and an insulating sleeve is provided between the long bolts and the motor housing or the bearing seat.

[0009] An insulating pad is provided between the bearing seat and the motor housing.

[0010] The motor shaft extends into the gear chamber and is connected to the driving gear through an insulating connection structure. The insulating connection structure includes a connecting disk fixed on the motor shaft. The connecting disk and the driving gear are connected through a plurality of transmission rods. An insulating ring is provided between the transmission rod and the connecting disk.

[0011] The two ends of the driving shaft and the driven shaft are supported by bearings arranged in the pump housing and the bearing seat respectively.

[0012] Both ends of the motor shaft are supported by bearings arranged in the motor housing.

[0013] The present invention adopts the above scheme and has the following advantages:

[0014] By respectively arranging insulating structures between the bearing seat and the motor housing, and between the motor shaft and the driving gear, the internal and external connection positions between the pump head and the motor can be completely insulated. Even after part of the current of the fuel cell system is connected to the pump head, it will no longer be transmitted to the motor through the pump head, thereby preventing the current from being introduced into the ground through the grounding wire of the motor and lost through the earth, thereby avoiding current loss in the fuel cell system and achieving the purpose of saving energy. Description of the drawings:

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention.

[0017] In the figure, 1, motor housing, 2, pump housing, 3, bearing seat, 4, stator, 5, rotor, 6, motor shaft, 7, driving gear, 8, driven gear, 9, driving shaft, 10, driven shaft, 11, driving rotor, 12, driven rotor, 13, air inlet, 14, air outlet, 15, long bolt, 16, insulating sleeve, 17, insulating pad, 18, connecting plate, 19, transmission rod, 20, insulating ring, 21, bearing. Specific implementation method:

[0018] In order to clearly illustrate the technical features of the present solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0019] like Figure 1-2As shown, a method for preventing leakage of a hydrogen circulation pump for a fuel cell system is provided, by providing an insulating structure between the motor and the pump head of the hydrogen circulation pump, wherein the insulating structure includes an insulating structure provided between the motor housing 1 and the pump housing 2, and an insulating structure provided between the motor shaft 6 and the pump head driving shaft 9, thereby completely insulating the internal and external connection positions between the pump head and the motor, and the current introduced into the pump head by the fuel cell system along with the water vapor will no longer be transmitted to the motor, thereby preventing the current from being introduced into the earth through the grounding wire of the motor and being lost.

[0020] The hydrogen circulation pump comprises a motor housing 1 and a pump housing 2, and a bearing seat 3 therebetween. A gear chamber is formed between the bearing seat 3 and the motor housing 1. A stator 4, a rotor 5 and a motor shaft 6 are arranged in the motor housing 1. A meshing driving gear 7 and a driven gear 8 are arranged in the gear chamber. A driving shaft 9 and a driven shaft 10 are arranged in the pump housing 2. The driving shaft 9 extends into the gear chamber and is connected to the driving gear 7. The driven shaft 10 extends into the gear chamber and is connected to the driven gear 8. A driving rotor 11 is mounted on the driving shaft 9. A driven rotor 12 is mounted on the driven shaft 10. An air inlet 13 and an air outlet 14 are arranged on the pump housing 2.

[0021] The bearing seat 3 is connected to the motor housing 1 via a plurality of long bolts 15 , and an insulating sleeve 16 is provided between the long bolts 15 and the motor housing 1 or the bearing seat 3 for insulating and isolating the long bolts 15 from the motor housing 1 and the bearing seat 3 .

[0022] An insulating pad 17 is provided between the bearing seat 3 and the motor housing 1 to insulate the bearing seat 3 and the motor housing 1. An insulating pad may also be provided between the bearing seat 3 and the pump housing 2 to insulate the bearing seat and the pump housing.

[0023] The motor shaft 6 extends into the gear chamber and is connected to the driving gear 7 through an insulating connection structure. The insulating connection structure includes a connecting disk 18 fixed on the motor shaft 6. The connecting disk 18 and the driving gear 7 are connected through a plurality of transmission rods 19. An insulating ring 20 is provided between the transmission rod 19 and the connecting disk 18 to insulate and isolate the transmission rod 19 and the connecting disk 18. An insulating ring may also be provided between the transmission rod 19 and the driving gear 7 to insulate and isolate the transmission rod and the driving gear.

[0024] The insulating sleeve 16 , the insulating pad 17 , and the insulating ring 20 can all be made of insulating materials such as plastic and rubber.

[0025] Both ends of the driving shaft 9 and the driven shaft 10 are supported by bearings 21 disposed in the pump housing 2 and the bearing seat 3 respectively.

[0026] Both ends of the motor shaft 6 are supported by bearings 21 disposed in the motor housing 1 .

[0027] Working principle:

[0028] When the fuel cell system is working, part of the current of the fuel cell system will be connected to the pump head of the hydrogen circulation pump through the water vapor in the hydrogen-containing mixed gas. The present invention realizes insulation isolation between the motor housing 1 and the bearing seat 3 and the long bolts 15 by arranging the insulating sleeve 16 and the insulating pad 17, thereby preventing the current of the pump head from being introduced into the motor housing 1 through the pump housing 2, the bearing seat 3 and the long bolts 15; by arranging the insulating ring 20, insulation isolation is achieved between the motor shaft 6 and the driving gear 7, thereby preventing the current of the pump head from being introduced into the motor shaft 6 through the driving shaft 9 and the driving gear 7; after the above two means are combined, the current on the pump head will no longer be transmitted to the motor, thereby preventing the current from being introduced into the ground through the grounding wire of the motor and being lost through the earth, thereby avoiding current loss in the fuel cell system.

[0029] The above specific implementation manner cannot be used as a limitation on the protection scope of the present invention. For those skilled in the art, any substitution, improvement or change made to the implementation manner of the present invention falls within the protection scope of the present invention.

[0030] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A method for preventing leakage of a hydrogen circulation pump for a fuel cell system, characterized in that: By providing an insulating structure between the motor and the pump head of the hydrogen circulation pump, the insulating structure includes an insulating structure provided between the motor housing and the pump housing, and an insulating structure provided between the motor shaft and the driving shaft of the pump head, so that the internal and external connection positions between the pump head and the motor are completely insulated, the current introduced into the pump head by the fuel cell system along with the water vapor will no longer be transmitted to the motor, thereby preventing the current from being introduced into the earth through the grounding wire of the motor and being lost; The hydrogen circulation pump comprises a motor housing and a pump housing, and a bearing seat therebetween. A gear chamber is provided between the bearing seat and the motor housing. A stator, a rotor and a motor shaft are provided in the motor housing. A meshing driving gear and a driven gear are provided in the gear chamber. A driving shaft and a driven shaft are provided in the pump housing. The driving shaft extends into the gear chamber and is connected to the driving gear. The driven shaft extends into the gear chamber and is connected to the driven gear. A driving rotor is installed on the driving shaft. A driven rotor is installed on the driven shaft. An air inlet and an air outlet are provided on the pump housing. The bearing seat is connected to the motor housing by a plurality of long bolts, and an insulating sleeve is provided between the long bolts and the motor housing or the bearing seat; An insulating pad is provided between the bearing seat and the motor housing; The motor shaft extends into the gear chamber and is connected to the driving gear through an insulating connection structure. The insulating connection structure includes a connecting disk fixed on the motor shaft. The connecting disk and the driving gear are connected through a plurality of transmission rods. An insulating ring is provided between the transmission rod and the connecting disk.

2. The method for preventing leakage of a hydrogen circulation pump for a fuel cell system according to claim 1, characterized in that: The two ends of the driving shaft and the driven shaft are supported by bearings arranged in the pump housing and the bearing seat respectively.

3. The method for preventing leakage of a hydrogen circulation pump for a fuel cell system according to claim 1, characterized in that: Both ends of the motor shaft are supported by bearings arranged in the motor housing.

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