Hydrogen circulating pump for preventing electric leakage of fuel cell system

Abstract

The utility model relates to the technical field of fuel cells, in particular to a hydrogen circulating pump for preventing electric leakage of a fuel cell system. Comprising a motor shell, a pump shell and a bearing seat between the motor shell and the pump shell, a driving shaft and a driven shaft are arranged in the pump shell, the driving shaft extends into a gear chamber to be connected with a driving gear, the driven shaft extends into the gear chamber to be connected with a driven gear, a driving rotor is installed on the driving shaft, a driven rotor is installed on the driven shaft, and an air inlet and an air outlet are formed in the pump shell. The bearing seat is in insulation connection with the motor shell, and the motor shaft extends into the gear chamber and is connected with the driving gear through an insulation connection structure. The internal and external connection position between the pump head and the motor can be completely insulated, part of current of a fuel cell system cannot be transmitted to the motor through the pump head even if the pump head is electrically connected, the current is prevented from being guided into the ground through a grounding wire of the motor and being lost through the ground, the current loss of the fuel cell system is avoided, and the purpose of saving energy is achieved.

Description

Technical field:

[0001] The utility model relates to the technical field of fuel cells, in particular to a hydrogen circulation pump for preventing electric leakage of 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. Utility model content:

[0004] In order to make up for the deficiencies of the prior art, the utility model provides a hydrogen circulation pump for preventing leakage of a fuel cell system, thereby solving the problem of loss of current in the fuel cell system caused by the current being introduced into the earth through the hydrogen circulation pump.

[0005] The technical solution adopted by the utility model to solve the above technical problems is:

[0006] A hydrogen circulation pump for preventing electric leakage of a fuel cell system 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; an air inlet and an air outlet are provided on the pump housing; the bearing seat and the motor housing are insulated; the motor shaft extends into the gear chamber and is connected to the driving gear via an insulating connection structure.

[0007] 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.

[0008] An insulating pad is provided between the bearing seat and the motor housing.

[0009] The insulating connection structure comprises a connecting disk fixed on the motor shaft, the connecting disk and the driving gear are connected via a plurality of transmission rods, and an insulating ring is arranged between the transmission rod and the connecting disk.

[0010] 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.

[0011] Both ends of the motor shaft are supported by bearings arranged in the motor housing.

[0012] The utility model adopts the above scheme and has the following advantages:

[0013] 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:

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] Figure 2 It is a cross-sectional structural schematic diagram of the utility model.

[0016] 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:

[0017] In order to clearly illustrate the technical features of the present invention, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0018] like Figure 1-2 As shown, a hydrogen circulation pump for preventing leakage of a fuel cell system 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 driving gear 7 and a driven gear 8 meshing with each other 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, the bearing seat 3 and the motor housing 1 are insulated, the motor shaft 6 extends into the gear chamber and is connected to the driving gear 7 through an insulating connection structure.

[0019] 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 .

[0020] 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.

[0021] The insulating connection structure includes a connecting disk 18 fixed on the motor shaft 6, and the connecting disk 18 is connected to the driving gear 7 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.

[0022] 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.

[0023] 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.

[0024] Both ends of the motor shaft 6 are supported by bearings 21 disposed in the motor housing 1 .

[0025] Working principle:

[0026] 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 utility model realizes the 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, the insulation isolation between the motor shaft 6 and the driving gear 7 is realized, 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 the current loss of the fuel cell system.

[0027] The above-mentioned specific implementation manner cannot be used as a limitation on the protection scope of the present utility model. For those skilled in the art, any replacement, improvement or change made to the implementation manner of the present utility model falls within the protection scope of the present utility model.

[0028] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A hydrogen circulation pump for preventing leakage of a fuel cell system, characterized in that: It includes a motor housing and a pump housing, and a bearing seat therebetween. A gear chamber is formed 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. An air inlet and an air outlet are arranged on the pump housing. The bearing seat and the motor housing are insulated. The motor shaft extends into the gear chamber and is connected to the driving gear through an insulating connection structure.

2. A hydrogen circulation pump for preventing leakage of a fuel cell system according to claim 1, characterized in that: 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.

3. A hydrogen circulation pump for preventing leakage of a fuel cell system according to claim 1, characterized in that: An insulating pad is provided between the bearing seat and the motor housing.

4. A hydrogen circulation pump for preventing leakage of a fuel cell system according to claim 1, characterized in that: The insulating connection structure comprises a connecting disk fixed on the motor shaft, the connecting disk and the driving gear are connected via a plurality of transmission rods, and an insulating ring is arranged between the transmission rod and the connecting disk.

5. A hydrogen circulation pump for preventing leakage of 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.

6. A hydrogen circulation pump for preventing leakage of 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.

Images