Insulation electronic water pump structure

Abstract

The utility model belongs to the field of electronic water pumps, and particularly relates to an insulating electronic water pump structure which comprises a pump body, a motor shell, a control chamber and a water pump rear cover which are sequentially connected, an impeller is arranged in the pump body, and an IPM and a controller are arranged in the control chamber. The front end of the motor shell is fixedly connected with the pump body through the front end cover, and the rear end is fixed with the control chamber; a stator assembly and a rotor tank are arranged in the motor shell, and a rotor assembly is arranged in the rotor tank; a rear end cover is arranged at the rear end of the rotor tank; the outer side of the rear end cover and the outer side of the control chamber are each provided with a shaft hole. Ceramic columns used for heat conduction and insulation are arranged in the two shaft holes. The rear end cover is made of a heat-conducting metal material; the IPM is attached to the control chamber. According to the utility model, the rear end cover, the ceramic column and the control chamber are mutually connected, heat of the IPM can be transmitted to a flowing medium in the rotor tank for cooling, the heat dissipation performance is good, the insulation effect is good, and the front end cover is subjected to surface insulation treatment, so that the motor shell is insulated from the medium.

Description

Technical Field

[0001] This utility model relates to the field of electronic water pumps, and in particular to a novel water-cooled insulated electronic water pump structure for dielectric insulation, in order to promote the application of electronic water pumps in the field of fuel cells. Background Technology

[0002] During fuel cell operation, increased conductivity leads to premature failure of the ion filter. Increased coolant conductivity affects proton exchange, reducing battery life and decreasing system insulation. In hydrogen fuel cell systems, the coolant in the water circuit can become electrified, with voltages reaching over 300V, posing a significant safety hazard. Therefore, all fuel cell companies require effective insulation between the fuel medium and the outer casing.

[0003] The electric water pump drives the impeller to rotate via a DC brushless motor, thus meeting the cooling system's requirements for flow rate and head.

[0004] There are currently three mainstream solutions on the market:

[0005] The first method uses magnetic transmission to completely isolate the liquid from the motor chamber. The heat generated by the control board and motor is cooled by air, naturally dissipating from the motor casing and the finned rear end cover. However, this method is ineffective at high ambient temperatures.

[0006] The second method uses a tank structure to isolate the motor rotor and stator. Liquid from the cooling pipes is allowed to enter the tank, and the rotor is immersed in the liquid. As the water pump power increases, the heat generated by the PCBA also increases. The heat generated by the control board and motor rotor is cooled by air, naturally dissipating outwards from the motor casing and rear end cover. This method has poor heat dissipation.

[0007] The third method also utilizes a tank structure to isolate the motor's rotor and stator. The motor housing and rear cover respectively fix the front and rear bearings. Liquid from the cooling pipes is allowed to enter the tank, and the rotor is immersed in the liquid. A pressure difference is created by drilling a through hole in the motor shaft, thereby generating water flow for cooling. This method provides good heat dissipation for the control board, but it cannot achieve insulation between the medium and the housing. In recent years, due to the demands of many customers, surface treatment insulation solutions have also been developed. However, this method is unreliable, carries the risk of perforation, has high processing costs, and a low yield. Utility Model Content

[0008] The technical objective of this utility model is to solve the problems existing in the prior art by proposing a novel insulated electronic water pump structure.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] An insulated electronic water pump structure includes a pump body, a motor housing, a control chamber, and a water pump rear cover connected in sequence. The pump body has an impeller, and the control chamber houses an IPM and a controller. The control chamber is equipped with low-voltage connectors and high-voltage connectors that are connected to the controller's wiring.

[0011] The front end of the motor housing is fixedly connected to the pump body via a front end cover, and the rear end is fixed to the control room; the motor housing contains a stator assembly and a rotor tank, the rotor tank is located inside the stator assembly, the rotor tank contains the rotor assembly, and the rotor assembly passes through the front end cover and is fixedly connected to the impeller;

[0012] The rotor tank is provided with a rear end cover, and the front and rear ends of the rotor assembly are respectively mounted on the front end cover and the rear end cover via a bearing;

[0013] The front cover, rotor housing, and rear cover form a space isolated from the area inside the motor housing;

[0014] A shaft hole is opened on the outer side of the rear cover and the outer side of the control room. Ceramic pillars for heat conduction and insulation are installed in the two shaft holes. The ceramic pillars are coaxial with the rotation axis of the rotor assembly.

[0015] The rear cover is made of thermally conductive metal.

[0016] IPM is designed to fit the layout of the control room.

[0017] As a further preferred option, the IPM is fitted at the inner surface of the control room where the shaft hole is located.

[0018] As a further preferred option, thermally conductive insulating gaskets are provided between the control room and the rear cover and the IPM, respectively.

[0019] As a further preferred option, the front cover has an insulating layer on its surface inside the rotor tank.

[0020] As a further preferred embodiment, the inner ring of the stator assembly is provided with equidistant tooth grooves, which are parallel to the axial direction of the rotor assembly. The outer surface of the rotor housing is provided with vertical ribs that correspond one-to-one with the tooth grooves, and the vertical ribs are embedded in the tooth grooves corresponding to them.

[0021] As a further preferred option, a thrust disc and a rubber pad are provided between the rotor assembly and the bearing of the front cover. Beneficial effects

[0022] This utility model discloses an insulated electronic water pump structure. The rotor tank is equipped with a rear end cover structure, and a ceramic column is added between the rear end cover and the control chamber to achieve insulation and heat conduction between the rear end cover and the control chamber. At the same time, the rear cover plate is connected to the IPM with a thermally conductive insulating gasket, so that the flowing medium in the rotor tank can cool the motor and the IPM (or IGBT). It has good heat dissipation performance and excellent insulation effect. The front end cover is surface-insulated to ensure insulation between the motor housing and the medium. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the rotor tank.

[0026] Figure 4 Schematic diagram of the thermally conductive insulating gasket between the rotor tank and the control room;

[0027] In the diagram: 1-Pump body, 2-Motor housing, 3-Control room, 4-Pump rear cover, 5-Low-pressure connector, 6-High-pressure connector, 7-Impeller, 8-Front end cover, 9-Rotor tank, 10-Rotor assembly, 11-Rear end cover, 12-Ceramic column, 13-Thrust disc, 14-Rubber pad, 15-Stator assembly, 16-Bearing, 17-IPM, 18-Controller. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0029] An insulated electronic water pump structure is disclosed. This insulated electronic water pump is mainly used in fuel cell applications because the medium in a fuel cell is electrified. Therefore, the water pump needs to be insulated during operation. The insulated electronic water pump structure includes a pump body 1, a motor housing 2, a control chamber 3, and a pump rear cover 4 connected in sequence. The pump body 1 has an impeller 7, which is connected to the rotor assembly 10 by screws. The control chamber 3 houses an IPM 17 and a controller (PCBA) 18. The IPM 17 assembly is welded to the controller 18 and connected to the control chamber 3 by screws.

[0030] The control room 3 is equipped with a low-voltage connector 5 and a high-voltage connector 6 that are connected to the controller 18 circuit. The high-voltage connector 5, the low-voltage connector 6 and the control room 3 are connected by screws.

[0031] The front end of the motor housing 2 is fixedly connected to the pump body 1 through the front end cover 8. The motor housing 2 has a stator assembly 15 and a rotor tank 9 inside. The rotor tank 9 is located inside the stator assembly 15. The rotor tank 9 has a rotor assembly 10 inside. The rotor assembly 10 passes through the front end cover 8 and is fixedly connected to the impeller 7.

[0032] The rear end of the motor housing 2 is fixed to the control chamber 3. The pump body 1, the motor housing 2, and the front cover 8 are connected by screws and sealing rings. The motor housing 2 and the control chamber 3 are connected by screws and sealing rings. The control chamber 3 and the rear cover 4 of the water pump are connected by screws and sealing rings.

[0033] The rotor tank 9 is provided with a rear end cover 11. The rear end cover 11 and the rotor tank 9 are connected by screws and sealing rings. The front and rear ends of the rotor assembly 10 are respectively mounted on the front end cover 8 and the rear end cover 11 by a bearing 16.

[0034] The front cover 8, rotor housing 9, and rear cover 11 form a space isolated from the area inside the motor housing 2;

[0035] A shaft hole is opened on the outer side of the rear end cover 11 and the outer side of the control chamber 3. A ceramic column 12 for heat conduction and insulation is provided in the two shaft holes. The ceramic column 12 is coaxial with the rotation axis of the rotor assembly 10. The ceramic column 12 and a bearing 16 are pressed on the rear end cover 11 and connected to the control chamber 3 through the ceramic column 12. The other bearing 16 is pressed on the front end cover 8.

[0036] The rear cover 11 is made of thermally conductive metal, which eliminates the root cause of conductivity leakage and has good thermal conductivity. The addition of thermally conductive insulating pads achieves the purpose of insulation while dissipating heat from the IPM (or IGBT).

[0037] The rear cover 11 is connected to the control chamber 3 via a ceramic column 12, which solves the insulation and heat conduction problems while providing a good positioning function with the motor housing 2.

[0038] The IPM17 is fitted into the control room 3 layout.

[0039] The IPM17 is fitted at the inner surface of the control chamber 3, where the shaft hole is located.

[0040] Thermally conductive insulating pads are provided between the control room 3 and the rear cover 11 and IPM17 respectively.

[0041] The front cover 8 has an insulating layer on its surface inside the rotor tank 9.

[0042] A thrust plate 13 and a rubber pad 14 are provided between the rotor assembly 10 and the bearing 16 of the front cover 8. The rubber pad 14 and the thrust plate 13 are pressed against the rotor assembly 10.

[0043] The stator assembly 15 has equidistant toothed grooves on its inner ring, which are parallel to the axial direction of the rotor assembly 10. Correspondingly, the outer surface of the rotor housing 9 has vertical ribs that correspond one-to-one with the toothed grooves, and the vertical ribs are embedded in their corresponding toothed grooves. Furthermore, the surface of the rotor housing 9 is designed with six vertical ribs that run through the stator toothed grooves, which also serve as auxiliary positioning. At the same time, they are screwed to the rear end cover 11 and work with the thrust plate 13 and the rubber pad 14 to help withstand the force brought by the rotor housing end cover, thereby improving the stability of the entire rotor component.

[0044] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An insulated electronic water pump structure, comprising a pump body (1), a motor housing (2), a control chamber (3), and a water pump rear cover (4) connected in sequence, wherein the pump body (1) has an impeller (7), and the control chamber (3) has an IPM (17) and a controller (18) built in it; the control chamber (3) is provided with a low-voltage connector (5) and a high-voltage connector (6) connected to the controller (18) by wiring. The front end of the motor housing (2) is fixedly connected to the pump body (1) through the front end cover (8), and the rear end is fixed to the control room (3); the motor housing (2) contains a stator assembly (15) and a rotor tank (9), the rotor tank (9) is located inside the stator assembly (15), the rotor tank (9) contains a rotor assembly (10), and the rotor assembly (10) passes through the front end cover (8) and is fixedly connected to the impeller (7); Its features are: The rotor tank (9) is provided with a rear end cover (11) at the rear end, and the front and rear ends of the rotor assembly (10) are respectively mounted on the front end cover (8) and the rear end cover (11) by a bearing (16); The front cover (8), rotor housing (9), and rear cover (11) form a space isolated from the area inside the motor housing (2); A shaft hole is provided on the outer side of the rear end cover (11) and the outer side of the control chamber (3). A ceramic column (12) for heat conduction and insulation is provided in the two shaft holes. The ceramic column (12) is coaxial with the rotation axis of the rotor assembly (10). The rear end cover (11) is made of thermally conductive metal. The IPM (17) is fitted into the control room (3).

2. The insulated electronic water pump structure according to claim 1, characterized in that: The IPM (17) is attached at the inner surface of the shaft hole corresponding to the control chamber (3).

3. The insulated electronic water pump structure according to claim 2, characterized in that: The control room (3) is provided with thermally conductive insulating pads between the rear end cover (11) and the IPM (17).

4. The structure of an insulated electronic water pump according to claim 1, characterized in that: The front cover (8) has an insulating layer on its surface inside the rotor tank (9).

5. The structure of an insulated electronic water pump according to claim 1, characterized in that: The stator assembly (15) has toothed grooves arranged at equal intervals on the inner ring. The toothed grooves are parallel to the axial direction of the rotor assembly (10). The outer surface of the rotor tank (9) is provided with vertical ribs that correspond one-to-one with the toothed grooves. The vertical ribs are embedded in the toothed grooves corresponding to them.

6. The structure of an insulated electronic water pump according to claim 1, characterized in that: A thrust plate (13) and a rubber pad (14) are provided between the rotor assembly (10) and the bearing (16) of the front cover (8).

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