Vacuum pump for explosion-proof type hydrogen energy internal combustion engine

Abstract

The utility model provides a vacuum pump for an explosion-proof type hydrogen energy internal combustion engine. The vacuum pump comprises a vacuum pump shell, an impeller, a motor shell, a motor stator and rotor, a driving shaft, a driving plate shell, a driving plate and a driving plate rear cover. The motor shell comprises a cylinder part and a disc part, a shaft hole is formed in the center of the disc part, one end of the driving shaft penetrates through the shaft hole of the disc part and then is fixedly connected with the impeller, a shaft seal and a bearing are installed between the driving shaft and the shaft hole of the disc part, the driving plate shell is fixedly connected with the cylinder part, and a blind hole is formed in the driving plate shell and used for installing the bearing. The bearing supports the other end of the driving shaft; a through hole is further formed in the drive plate shell, a terminal of a motor stator and a terminal of a motor rotor penetrate out of the through hole, a terminal partition plate is fixedly arranged in the middle of the terminal, the terminal partition plate is installed in the through hole of the driver shell from inside to outside in an interference mode, and then high-barrier sealant is injected into the through hole from outside. According to the structure, hydrogen can be prevented from entering the cavity between the driving plate shell and the driving plate rear cover.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen energy power systems, in particular to a vacuum pump for a hydrogen energy internal combustion engine. Background Art

[0002] With increasing environmental protection requirements and the exploration of new energy sources, hydrogen energy is gaining increasing attention as a clean energy source. Hydrogen internal combustion engines produce exhaust gases during combustion. To improve combustion efficiency and ensure proper engine operation, these exhaust gases must be effectively extracted and the pressure within the chamber balanced. Existing vacuum pumps have shortcomings in safety, reliability, and applicability, particularly when used in flammable and explosive environments. For example, when the hydrogen concentration is above 4% and below 75%, it can explode when exposed to sparks. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a flameproof vacuum pump for a hydrogen internal combustion engine with compact structure and high safety.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a flameproof vacuum pump for a hydrogen internal combustion engine, comprising a vacuum pump housing, an impeller, a shaft seal, a bearing, a motor housing, a motor stator and rotor, a driving shaft, a drive plate housing, a drive plate, a drive plate back cover, a connector, and a terminal partition; the motor housing comprises an integrally formed cylindrical portion and a disc portion, a shaft hole is provided in the center of the disc portion, the motor stator and rotor and the driving shaft are installed in the motor housing, one end of the driving shaft passes through the shaft hole of the disc portion and is fixedly connected to the impeller, a shaft seal and a bearing are installed between the driving shaft and the shaft hole of the disc portion, and the vacuum pump housing cover is provided on the disc portion to form a pump The cavity is used to accommodate the impeller, and the drive plate housing is fixedly connected to the cylindrical part to close the motor housing. A blind hole is provided on the drive plate housing for installing a bearing, and the bearing is used to provide support for the other end of the driving shaft; the drive plate housing is also provided with a through hole for the terminal of the stator and rotor of the electric motor to pass through, and a terminal partition is fixedly provided in the middle of the terminal to close the through hole on the drive plate housing, and the terminal partition is installed in the through hole of the driver housing from the inside to the outside in an interference fit manner, and then high-barrier sealant is injected into the through hole from the outside to achieve isolation between the stator and rotor of the motor and the drive plate; the drive plate is installed in the drive plate housing and then closed with the drive plate back cover.

[0005] The working principle and process of the above-mentioned vacuum pump are as follows: the motor rotor drives the driving shaft to rotate, and then the driving shaft drives the impeller to rotate in the pump chamber, so that the air in the pump chamber flow channel is transported along the direction of rotation of the impeller under the action of the centrifugal force generated by the rotation of the impeller, and then discharged to the outside through the outlet.

[0006] Because a shaft seal is installed between the drive shaft and the shaft hole of the disc, the vacuum pump cavity and the motor cavity are separated, preventing hydrogen from entering the motor cavity. In addition, because the drive plate housing has only one through-hole, which is sealed with a terminal partition and high-barrier sealant, the motor cavity and the drive plate are isolated. Even if a small amount of hydrogen leaks from the vacuum pump cavity into the motor cavity, it cannot enter the cavity between the drive plate housing and the drive plate rear cover, thus ensuring the safety of the vacuum pump. This is because only the drive plate can generate sparks, and the motor stator and rotor will not generate sparks.

[0007] In one embodiment, the stator part of the motor stator and rotor is installed into the motor housing by shrink fitting; the rotor part of the motor stator and rotor is installed in the middle of the driving shaft by interference pressing, and the impeller is installed at the shaft head of the driving shaft by interference pressing.

[0008] In one embodiment, the vacuum pump housing is provided with an outlet and an inlet.

[0009] In one embodiment, the inlet is trumpet-shaped, with a larger outer portion and a smaller inner portion, and the inlet angle is 21 degrees to the axis of the pump body. This design helps guide the gas into the pump chamber evenly, reducing airflow impact and noise, thereby reducing noise and improving airflow smoothness.

[0010] In one embodiment, the outlet angle is 16° to the pump body axis, and the outlet is located closer to the outer edge of the vacuum pump housing than the inlet. This design ensures that the gas flows out smoothly and reduces turbulence effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the overall cross-section of the vacuum pump in the implementation of the present utility model;

[0012] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of the drive plate housing;

[0013] Figure 3 This is a schematic diagram of the combined structure of the impeller, motor stator and rotor, and driving shaft in the implementation of the utility model;

[0014] Figure 4 This is a schematic diagram of the outer side structure of the vacuum pump housing in the implementation of the present utility model;

[0015] Figure 5 This is a schematic diagram of the inner side structure of the vacuum pump housing in the implementation of the present utility model;

[0016] The accompanying drawings are:

[0017] 1. Vacuum pump housing; 2. Impeller; 3. Shaft seal; 4. Bearing; 5. Motor housing; 6. Motor stator and rotor; 7. Drive shaft; 8. Drive plate housing; 9. Drive plate; 10. Drive plate back cover; 11. Connector; 12. Terminal partition; 101. Inlet; 102. Outlet; 201. High-barrier sealant. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the utility model more clearly understood, the utility model is described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not limited to the utility model.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0020] like Figures 1 to 5 As shown, the preferred embodiment of the utility model is: a flameproof vacuum pump for a hydrogen internal combustion engine, comprising a vacuum pump housing 1, an impeller 2, a shaft seal 3, a bearing 4, a motor housing 5, a motor stator and rotor 6, a driving shaft 7, a drive plate 9 housing 8, a drive plate 9, a drive plate 9 back cover, a connector 11, and a terminal partition 12; the motor housing 5 comprises an integrally formed cylindrical portion and a disc portion, a shaft hole is provided in the center of the disc portion, the motor stator and rotor 6 and the driving shaft 7 are installed in the motor housing 5, one end of the driving shaft 7 passes through the shaft hole of the disc portion and is fixedly connected to the impeller 2, a shaft seal 3 and a bearing 4 are installed between the driving shaft 7 and the shaft hole of the disc portion, and the vacuum pump housing 1 is covered on the disc portion to form a pump chamber to accommodate The impeller 2, the drive plate 9 housing 8 and the cylindrical part are fixedly connected to each other for closing the motor housing 5. A blind hole is provided on the drive plate 9 housing 8 for installing a bearing 4, and the bearing 4 is used to provide support for the other end of the driving shaft 7; the drive plate 9 housing 8 is also provided with a through hole for the terminal of the motor stator and rotor 6 to pass through, and a terminal partition 12 is fixedly provided in the middle of the terminal for closing the through hole on the drive plate 9 housing 8. The terminal partition 12 is installed in the through hole of the driver housing from the inside to the outside in an interference fit manner, and then a high-barrier sealant 201 is injected into the through hole from the outside to achieve isolation between the motor stator and rotor 6 and the drive plate 9; the drive plate 9 is installed in the drive plate 9 housing 8 and then closed with the back cover of the drive plate 9.

[0021] The working principle and process of the above-mentioned vacuum pump are as follows: the motor rotor drives the driving shaft 7 to rotate, and the driving shaft 7 then drives the impeller 2 to rotate in the pump chamber, so that the air in the pump chamber flow channel is transported along the rotation direction of the impeller 2 under the action of the centrifugal force generated by the rotation of the impeller 2, and then discharged to the outside through the outlet 102.

[0022] Because a shaft seal 3 is installed between the driving shaft 7 and the shaft hole of the disc portion, the vacuum pump cavity is separated from the motor cavity, preventing hydrogen from entering the motor cavity. Furthermore, because the drive plate 9 housing 8 has only one through-hole, which is sealed with a terminal partition 12 and high-barrier sealant 201, the motor cavity and the drive plate 9 are isolated. Even if a small amount of hydrogen leaks from the vacuum pump cavity into the motor cavity, it cannot enter the cavity between the drive plate 9 housing 8 and the drive plate 9 rear cover, thus ensuring the safety of the vacuum pump. This is because only the drive plate 9 is likely to generate sparks, and the motor stator and rotor 6 will not generate sparks.

[0023] In this embodiment, the stator part of the motor stator and rotor 6 is installed into the motor housing 5 by shrink fitting; the rotor part of the motor stator and rotor 6 is installed in the middle of the driving shaft 7 by interference pressing, and the impeller 2 is installed at the shaft head of the driving shaft 7 by interference pressing.

[0024] like Figure 4 、 5 As shown, the vacuum pump housing 1 is provided with an outlet 102 and an inlet 101. The inlet 101 is trumpet-shaped with a larger outside and a smaller inside. The angle of the inlet 101 is 21° to the axis of the pump body. This design is conducive to guiding the gas to flow into the pump chamber evenly, reducing the impact and noise of the airflow, thereby reducing noise and improving the smoothness of the airflow; the angle of the outlet 102 is 16° to the axis of the pump body. The position of the outlet 102 is closer to the outer edge of the vacuum pump housing 1 relative to the inlet 101. This design can ensure that the gas remains stable when flowing out and reduce the turbulent effect.

[0025] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the scope of the present invention patent.

[0026] In order to make it easier for ordinary technicians in this field to understand the improvements of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified, and for the sake of clarity, some other elements are omitted in this application document. Ordinary technicians in this field should realize that these omitted elements may also constitute the content of the present invention.

Claims

1. A flameproof vacuum pump for a hydrogen internal combustion engine, characterized in that: The invention comprises a vacuum pump housing (1), an impeller (2), a motor housing (5), a motor stator and rotor (6), a driving shaft (7), a drive plate (9) housing (8), a drive plate (9), a drive plate (9) back cover, and a terminal partition (12); the motor housing (5) comprises an integrally formed cylindrical portion and a disc portion, an axial hole is provided at the center of the disc portion, the motor stator and rotor (6) and the driving shaft (7) are installed in the motor housing (5), one end of the driving shaft (7) passes through the axial hole of the disc portion and is fixedly connected to the impeller (2), a shaft seal (3) and a bearing (4) are installed between the driving shaft (7) and the axial hole of the disc portion, the vacuum pump housing (1) is covered on the disc portion to form a pump chamber to accommodate the impeller (2), the drive plate (9) housing (8) is fixedly connected to the cylindrical portion The motor housing (5) is sealed, and a blind hole is provided on the housing (8) of the driving plate (9) for installing a bearing (4), and the bearing (4) provides support for the other end of the driving shaft (7); the driving plate (9) housing (8) is also provided with a through hole for the terminal of the stator and rotor (6) of the power supply machine to pass through, and a terminal partition (12) is fixed in the middle of the terminal for sealing the through hole on the housing (8) of the driving plate (9), and the terminal partition (12) is installed in the through hole of the driver housing from the inside to the outside in an interference fit manner, and then a high-barrier sealant (201) is injected into the through hole from the outside to achieve isolation between the stator and rotor of the motor (6) and the driving plate (9); the driving plate (9) is installed in the housing (8) of the driving plate (9) and then sealed with the rear cover of the driving plate (9).

2. The explosion-proof vacuum pump for a hydrogen internal combustion engine according to claim 1, characterized in that: The stator part of the motor stator and rotor (6) is installed in the motor housing (5) by heat-fitting; the rotor part of the motor stator and rotor (6) is installed in the middle of the driving shaft (7) by interference pressing, and the impeller (2) is installed at the shaft head of the driving shaft (7) by interference pressing.

3. The explosion-proof vacuum pump for a hydrogen internal combustion engine according to claim 1 or 2, characterized in that: The vacuum pump housing (1) is provided with an outlet (102) and an inlet (101).

4. The explosion-proof vacuum pump for a hydrogen internal combustion engine according to claim 3, characterized in that: The inlet (101) is in the shape of a trumpet with a larger outer portion and a smaller inner portion. The angle of the inlet (101) is 21 degrees with the axis of the pump body.

5. The explosion-proof vacuum pump for a hydrogen internal combustion engine according to claim 3, characterized in that: The outlet (102) is at an angle of 16° to the axis of the pump body.

6. The explosion-proof vacuum pump for a hydrogen internal combustion engine according to any one of claims 3 to 5, characterized in that: The position of the outlet (102) is closer to the outer edge of the vacuum pump housing (1) than the inlet (101).

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