Electric vacuum pump capable of preventing suck-back water

Abstract

The utility model discloses an anti-suck-back electric vacuum pump which comprises a motor, a shell assembly is arranged on the motor, the shell assembly comprises a pump shell arranged on the motor and a pump cover matched with the pump shell, a pump cavity is formed in the shell assembly, a pump assembly is arranged in the pump cavity, and the pump assembly is connected with a motor shaft of the motor; an air suction port communicated with the pump cavity is formed in the outer side of the pump shell, and an exhaust port communicated with the pump cavity is formed in the bottom of the pump shell; a waterproof groove is formed in the pump cavity, and an exhaust hole communicated with the exhaust port is formed in the bottom of the waterproof groove; the waterproof groove is provided with a waterproof sealing plug, and the upper end face of the waterproof sealing plug is provided with an air hole. The electric vacuum pump can effectively solve the problem that when a vehicle wades into water, water can be sucked into the pump to cause burnout of a motor of an existing electric vacuum pump.

Description

Technical Field

[0001] The utility model relates to the field of vacuum pumps, in particular to an electric vacuum pump capable of preventing backflow of water. Background Art

[0002] Currently, the development of electric vehicles has become a global consensus to address energy crises and environmental pollution. However, due to technological limitations, my country's electric vehicle research and development generally focuses on improving existing internal combustion engine vehicles. Most cars use a vacuum-assisted servo system, which combines human and power.

[0003] The vacuum booster system in traditional internal combustion engine cars draws its vacuum source from the engine's intake manifold, typically achieving a negative vacuum pressure of -86 kPa. In electric vehicles converted from conventional vehicles, after the engine assembly is removed, the brake system loses its vacuum boosting function due to a lack of a vacuum power source. Human braking alone is insufficient to meet service braking requirements; therefore, an electric vacuum pump is required to provide vacuum boosting.

[0004] Since the electric vacuum pump is started and stopped by the control system based on the system pressure, the vacuum pump works intermittently. However, there will be a back-inhalation process at the moment the vacuum pump stops. In this way, if the vehicle wades through water, water will be sucked into the pump, causing the motor to burn out. Therefore, this problem must be solved fundamentally. Utility Model Content

[0005] The utility model aims to provide an electric vacuum pump which prevents backflow of water, so as to solve the problem that water is sucked into the interior of the pump when a vehicle is wading through water, thereby causing the motor to burn out.

[0006] The technical solution adopted by the utility model to solve its technical problems is: an electric vacuum pump that prevents backflow of water, including a motor, a housing assembly is provided on the motor, the housing assembly includes a pump housing machine installed on the motor and a pump cover adapted to the pump housing, a pump cavity is formed in the housing assembly, a pump assembly is provided in the pump cavity, and the pump assembly is connected to the shaft of the motor; an air intake port connected to the pump cavity is provided on the outside of the pump housing, and an exhaust port connected to the pump cavity is provided at the bottom of the pump housing; the pump cavity is provided with a waterproof groove, and an exhaust hole connected to the exhaust port is provided at the bottom of the waterproof groove; the waterproof groove is provided with a waterproof sealing plug, and an air vent is provided on the upper end surface of the waterproof sealing plug.

[0007] Furthermore, the waterproof sealing plug includes an upper sealing body, a sealing side wall is arranged around the upper sealing body, and the sealing side wall is adapted to the inner wall of the waterproof groove; an isolation block is provided on the side of the upper sealing body facing the waterproof groove, the top of the isolation block and the upper sealing body are integrally formed, the two ends are connected to the inner wall of the sealing side wall, and a gap is provided between the bottom of the isolation block and the bottom of the waterproof groove.

[0008] Furthermore, an avoidance gap is provided on the sealing side wall at a position corresponding to the exhaust hole.

[0009] Furthermore, a group of ventilation columns are integrally formed on one side of the upper sealing body facing the waterproof groove, and the ventilation columns are provided with ventilation holes that penetrate the upper sealing body; a gap is provided between one end of the ventilation column facing the bottom of the waterproof groove and the bottom of the waterproof groove.

[0010] The beneficial effects of this utility model are as follows: 1. By providing a waterproof groove and a waterproof sealing plug, water can be prevented from being directly sucked back into the pump cavity when the pump stops for a moment during wading, thereby burning the motor. Instead, the water is sucked back and stored in the waterproof groove. At the same time, it is isolated by the waterproof sealing plug to prevent it from entering the pump assembly and burning the vacuum pump. After the motor is started, the water in the waterproof groove is discharged into the atmosphere with the exhaust pressure.

[0011] 2. By setting an avoidance gap, it is possible to prevent the waterproof sealing plug from blocking the exhaust hole and affecting the normal operation of the exhaust port.

[0012] 3. The strength of the waterproof sealing plug is improved by setting up isolation blocks and breathable columns. At the same time, the breathable columns can also improve the strength of the vent position and increase the service life of the waterproof sealing plug.

[0013] The present invention will be described in more detail below through embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0015] Figure 2 This is a schematic diagram of the structure of the utility model after removing the waterproof sealing plug.

[0016] Figure 3 It is a structural diagram of the waterproof sealing plug.

[0017] Among them, 1. Motor, 2. Pump housing, 3. Pump cavity, 4. Pump assembly, 5. Pump cover, 6. Air intake, 7. Exhaust port, 8. Waterproof groove, 9. Waterproof sealing plug, 10. Exhaust hole, 11. Air vent, 12. Isolation block, 13. Avoidance gap, 14. Air column, 15. Sealing body, 16. Sealing side wall. DETAILED DESCRIPTION

[0018] Examples, such as Figures 1 to 3The electric vacuum pump shown here has a water backflow prevention function. The pump comprises a motor 1, which is provided with a housing assembly. The housing assembly comprises a pump housing 2 mounted on the motor 1 and a pump cover 5 adapted to the pump housing 2. A pump cavity 3 is formed within the housing assembly, within which a pump assembly 4 is provided. The pump assembly 4 is connected to the shaft of the motor 1. An air intake 6 communicating with the pump cavity 3 is provided on the outside of the pump housing 2, and an air outlet 7 communicating with the pump cavity 3 is provided at the bottom of the pump housing 2. The pump cavity 3 is provided with a waterproof groove 8, the bottom of which is provided with an air vent 10 communicating with the air outlet 7. The waterproof groove 8 is provided with a waterproof sealing plug 9, the upper end of which is provided with an air vent 11. The waterproof sealing plug 9 and the waterproof groove 8 have an interference fit.

[0019] The waterproof sealing plug 9 includes an upper sealing body 15, and a sealing side wall 16 is arranged around the upper sealing body 15, and the sealing side wall 16 is adapted to the inner wall of the waterproof groove 8; the upper sealing body 15 is provided with an isolation block 12 on the side facing the waterproof groove 8, and the top of the isolation block 12 is integrally formed with the upper sealing body, and the two ends are connected to the inner wall of the sealing side wall 16, and a gap is provided between the bottom of the isolation block 12 and the bottom of the waterproof groove 8.

[0020] The sealing side wall is provided with an escape notch 13 at the position corresponding to the exhaust hole 10. The setting of the escape notch 13 is to prevent the exhaust hole 10 from being blocked and to avoid the waterproof sealing plug 9 from affecting the normal use of the exhaust port 7.

[0021] A set of venting columns 14 are integrally formed on the side of the upper sealing body facing the waterproof groove 8. These venting columns 14 are provided with venting holes extending through the upper sealing body. A gap is provided between the ends of the venting columns 14 facing the bottom of the waterproof groove 8 and the bottom of the waterproof groove 8. The venting columns 14 and the isolation blocks 12 enhance the strength of the waterproof sealing plug 9 and prevent rupture of the venting holes 11 due to gas impact, thereby extending its service life.

[0022] The above is merely an illustrative description of the present invention. Obviously, the specific implementation of the present invention is not limited to the above-described methods. Any non-substantial improvements made using the method concepts and technical solutions of the present invention, or any direct application of the above-described concepts and technical solutions of the present invention to other situations without modification, are all within the scope of protection of the present invention.

Claims

1. An electric vacuum pump for preventing backflow of water, comprising a motor, a housing assembly disposed on the motor, the housing assembly comprising a pump housing mounted on the motor and a pump cover adapted to fit the pump housing, a pump cavity formed within the housing assembly, a pump assembly disposed within the pump cavity, the pump assembly being connected to a shaft of the motor; an air intake port communicating with the pump cavity being disposed on the outside of the pump housing, and an air discharge port communicating with the pump cavity being disposed at the bottom of the pump housing; characterized in that: The pump cavity is provided with a waterproof groove, the bottom of which is provided with an exhaust hole connected with the exhaust port; the waterproof groove is provided with a waterproof sealing plug, and the upper end surface of the waterproof sealing plug is provided with an air vent.

2. The electric vacuum pump for preventing backflow of water according to claim 1, characterized in that: The waterproof sealing plug includes an upper sealing body, a sealing side wall is arranged around the upper sealing body, and the sealing side wall is adapted to the inner wall of the waterproof groove; an isolation block is provided on the side of the upper sealing body facing the waterproof groove; the top of the isolation block and the upper sealing body are integrally formed, and its two ends are connected to the inner wall of the sealing side wall; a gap is provided between the bottom of the isolation block and the bottom of the waterproof groove.

3. The electric vacuum pump for preventing backflow of water according to claim 2, characterized in that: An avoidance gap is provided at the position of the sealing side wall corresponding to the exhaust hole.

4. The electric vacuum pump for preventing backflow of water according to claim 2 or 3, characterized in that: A group of ventilation columns are integrally formed on one side of the upper sealing body facing the waterproof groove, and the ventilation columns are provided with ventilation holes that penetrate the upper sealing body; a gap is set between one end of the ventilation column facing the bottom of the waterproof groove and the bottom of the waterproof groove.

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