Water pump stator assembly

Abstract

The utility model discloses a water pump stator assembly, which comprises a shell and a stator assembly, the stator assembly comprises a stator core, a stator winding and a stator inner shell, the stator inner shell is provided with an installation cavity, a center shaft is embedded in the center of the installation cavity, a heat dissipation metal plate is fixed at the bottom of the stator inner shell, and the heat dissipation metal plate is fixed at the bottom of the stator inner shell. A protruding ring and a capacitor installation protrusion are arranged on the heat dissipation metal plate, the capacitor installation protrusion forms a capacitor installation cavity, the protruding ring and the stator inner shell are in sealing fit, a communication hole communicated with the interior of the protruding ring is formed in the bottom of the installation cavity, a PCBA board is fixed to the bottom of the heat dissipation metal plate, and the PCBA board is fixed to the bottom of the heat dissipation metal plate. A capacitor on the PCBA board is plugged into the capacitor mounting cavity from the plugging opening, and heat-conducting glue is filled between the capacitor and the cavity wall of the capacitor mounting cavity. The water pump stator assembly can better perform active heat dissipation on the capacitor on the PCBA board, the overall heat dissipation effect is improved, and the heat dissipation requirement of a high-power water pump is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to water pump technical field especially relates to a water pump stator assembly. BACKGROUND

[0002] The current brushless electronic water pump is driven by the principle of electric-magnetic conversion, which rotates the rotor impeller assembly to realize the output of the cooling liquid. The applicant has previously applied for a stator assembly of a brushless electronic water pump (202221087721.7), which includes a plastic shell and a stator assembly fixed in the shell. The stator assembly includes a stator core, a stator winding, and a plastic stator inner shell. The ground spring is pressed between the stator core and the shell and is in contact with the heat dissipation metal plate, achieving grounding and heat dissipation at the same time.

[0003] However, the above-mentioned scheme still has some technical problems: 1. Although the water pump stator assembly uses a grounding spring to conduct heat from the PCBA board, the heat conduction contact surface of the grounding spring is small, and the heat conduction efficiency is relatively low, especially when the PCBA board is connected to a capacitor. The current capacitor is set backward, and the heat generated by the capacitor is mainly passively dissipated through the rear cover. However, with the increase of water pump power, this passive heat dissipation cannot meet the passive heat dissipation requirements; 2. The current water pump stator assembly is generally clamped from the outside of the stator core during injection molding, resulting in a protruding ridge on the outside of the water pump housing. The protruding ridge is formed by the stator core clamping fixture, so the overall size of the water pump stator assembly is relatively large, and the protruding ridge also affects the subsequent fixation of the water pump. Utility model content

[0004] The technical problem to be solved by the utility model is to provide a water pump stator assembly that can better actively dissipate heat from the capacitor on the PCBA board, improve the overall heat dissipation effect, and meet the heat dissipation requirements of high-power water pumps.

[0005] The utility model discloses a water pump stator assembly, including the shell of plastic and the stator subassembly fixed in the shell, the stator subassembly includes stator core, stator winding and the stator inner casing body of plastic, the stator core and stator winding embed in the stator inner casing body, be provided with the installation chamber for installing rotor impeller subassembly on the stator inner casing body, the center of installation chamber embeds the central axis, the lower flange portion of adapting with the upper cover of water pump is still provided with on the upper end of stator inner casing body, the bottom of stator inner casing body is fixed with the heat dissipation metal plate, be provided with the convex ring that protrudes upwards and the capacitor installation protruding that protrudes upwards on the heat dissipation metal plate, the capacitor installation cavity that forms the capacitor of installing is formed to capacitor installation protruding, the bottom of capacitor installation cavity is provided with the plug -in opening, the sealing fit between the convex ring with stator inner casing body, the bottom of installation chamber is provided with the communication hole with the inside communication of convex ring, the bottom of heat dissipation metal plate is fixed with PCBA board, the capacitor on PCBA board is plugged into capacitor installation cavity from plug -in opening, and the cavity wall between capacitor and capacitor installation cavity fills the heat conducting adhesive.

[0006] As a preferred scheme, the stator inner casing is provided with a plurality of clamping cavities supporting the stator core from the inside, and the bottom of the clamping cavities is through and the upper end is blind.

[0007] As a preferred scheme, the number of clamping cavities is three and is circumferentially distributed.

[0008] As a preferred scheme, the stator inner casing and the shell are integrally formed.

[0009] As a preferred scheme, the inner side of the capacitor installation protruding is connected with the convex ring, and the inner convex ring constitutes the inner side wall of the capacitor installation cavity.

[0010] As a preferred scheme, the inside of the shell is provided with a glue filling cavity at the inside end of the connector terminal.

[0011] The utility model discloses the effect is: because the heat dissipation metal plate is provided with the protruding ring that protrudes upwards and the capacitor installation boss that protrudes upwards, the capacitor installation cavity that installs the capacitor is formed to the capacitor installation boss, the bottom of capacitor installation cavity is provided with the plug -in opening, the protruding ring is sealed with stator inner casing, the bottom of installation chamber is provided with the communication hole that is communicated with the inside of protruding ring, the bottom of heat dissipation metal plate is fixed with PCBA board, the capacitor on PCBA board is plugged into capacitor installation cavity from plug -in opening, and the cavity wall between capacitor and capacitor installation cavity is filled with heat -conducting adhesive, therefore, when the power of water pump increases, the heat that the capacitor on PCBA board generates also increases, at this moment because the heat dissipation metal plate is provided with the capacitor installation boss that protrudes upwards and forms capacitor installation cavity, so the heat of capacitor will be conducted to capacitor installation boss, and simultaneously, the bottom of installation chamber is provided with the communication hole that is communicated with the inside of protruding ring, therefore, when water pump works, fluid will enter protruding ring after passing through communication hole and flow out, so the fluid will take away the heat of heat dissipation metal plate, so the heat of capacitor is taken away actively, thereby satisfying the heat dissipation requirement of higher power water pump.

[0012] And because the stator inner casing is provided with a plurality of clamping cavities supporting the stator core from the inside, the bottom of the clamping cavities is through and the upper end is blind, during the injection molding of the stator assembly, the stator core and the winding wrapped around the stator core are clamped in the injection cavity, and the clamping cavities are formed after the stator core is supported by the clamping clamp from the inside to the outside after injection molding, so that the convex strip for avoiding the clamping clamp is not formed on the outer side surface of the shell, so that the overall stator assembly is more compact, and the outer surface of the stator assembly is free of convex strips, which can be more conveniently fixed.

[0013] And because the stator inner casing and the shell are integrally formed, the assembly is further reduced, and the integration degree is higher.

[0014] And because the inside of the capacitor installation boss is connected with the protruding ring, the inner protruding ring constitutes the inner wall of the capacitor installation cavity, so that the position of the capacitor installation boss is further optimized, and the size of the entire metal heat dissipation plate is more compact.

[0015] And because the inside of the shell is provided with a glue filling cavity at the inside end of the connector terminal, the glue filling cavity can further seal the connector terminal of the connector. DRAWINGS

[0016] The utility model will be further described below in combination with the drawings and examples.

[0017] Figure 1 is the structure perspective view of the utility model embodiment;

[0018] Figure 2 is another perspective view of the embodiment of the utility model from another angle;

[0019] Figure 3 is a plan view of the embodiment of the utility model;

[0020] Figure 4 is Figure 3 is a sectional view at A-A;

[0021] Figure 5 is a perspective view of the embodiment of the utility model after hiding the radiating metal plate and PCBA plate;

[0022] Figure 6 is a fixed installation view of the radiating metal plate and PCBA plate;

[0023] Figure 7 is Figure 6 is a sectional view at B-B;

[0024] In the drawing: 100, stator assembly;101, shell;102, lower flange;103, connector;104, center shaft;105, PCBA plate;1051, capacitor;106, stator core;107, communication hole;108, stator inner housing;109, installation chamber;110, radiating metal plate;1101, protruding ring;1102, capacitor installation protrusion;1103, capacitor installation cavity;111, glue filling cavity;112, clamping cavity. DETAILED DESCRIPTION

[0025] The utility model will be described in further detail below through specific embodiments.

[0026] As Figures 1 to 7 shown, a water pump stator assembly 100 includes a plastic shell 101 and a stator assembly fixed in the shell 101, the stator assembly includes a stator core 106, a stator winding and a plastic stator inner housing 108, the stator core 106 and the stator winding are embedded in the stator inner housing 108, wherein in the embodiment, the stator inner housing 108 and the shell 101 are integrally formed. A plurality of clamping cavities 112 are arranged in the stator inner housing 108 to support the stator core 106 from the inside, the bottom of the clamping cavities 112 is through and the upper end is blind. The clamping cavities 112 are formed during the clamping injection molding of the stator core 106 and the stator winding, the number of the clamping cavities 112 is three and they are distributed in the circumference. Therefore, the supporting claws of the clamping fixture correspond to three. During injection molding, the clamping fixture supports the stator core 106 from the inside to the outside, and then it is put into the injection cavity for injection molding, so that the stator inner housing 108 and the shell 101 can be integrally formed to wrap the stator core 106 and the stator winding, and the outer circumference of the shell 101 will not have a convex strip.

[0027] The center of the stator inner housing 108 is provided with a mounting chamber 109 for mounting the rotor impeller assembly, the center of the mounting chamber 109 is embedded with a center shaft 104, wherein the center bottom of the mounting chamber 109 is provided with a center protrusion protruding upward, the center shaft 104 is embedded on the center protrusion, the upper end of the stator inner housing 108 is further provided with a lower flange part 102 matched with the upper cover of the water pump, the bottom of the stator inner housing 108 is fixed with a heat dissipation metal plate 110, the heat dissipation metal plate 110 is provided with a protruding ring 1101 protruding upward and a capacitor mounting protrusion 1102 protruding upward, the capacitor mounting protrusion 1102 forms a capacitor mounting cavity 1103 for mounting a capacitor 1051, the bottom of the capacitor mounting cavity 1103 is provided with a plug-in opening, the protruding ring 1101 and the stator inner housing 108 are sealed by extruding a sealing ring therebetween, the bottom of the mounting chamber 109 is provided with a communication hole 107 in communication with the inside of the protruding ring 1101, so that the fluid in the mounting chamber 109 enters the protruding ring 1101 through the communication hole 107 and circulates out, so as to take away the heat of the metal heat dissipation plate. The bottom of the heat dissipation metal plate 110 is fixed with a PCBA board 105, the capacitor 1051 on the PCBA board 105 is plugged into the capacitor mounting cavity 1103 from the plug-in opening, and the capacitor 1051 and the cavity wall of the capacitor mounting cavity 1103 are filled with heat-conducting glue. The metal heat dissipation plate can actively dissipate heat from the capacitor 1051, which further meets the heat dissipation requirements of the high-power water pump.

[0028] As shown in Figure 4 The inner side of the capacitor mounting protrusion 1102 is connected with the protruding ring 1101 in the embodiment, and the inner protruding ring constitutes the inner side wall of the capacitor mounting cavity 1103. The inner side of the terminal of the connector in the shell 101 is provided with a glue filling cavity 111, and the connector 103 is convenient for connecting with the external circuit.

[0029] In the embodiment, the PCBA board 105 is fixedly connected with the metal heat dissipation plate through bolts, and the metal heat dissipation plate is fixedly connected between the shell 101 and the stator inner housing 108 through bolts, and the whole is assembled.

[0030] The above-described embodiments are only descriptions of preferred embodiments of the present application and are not intended to limit the scope of the present application. Various modifications and improvements to the technical solutions of the present application without departing from the design spirit of the present application shall fall within the protection scope of the claims of the present application.

Claims

1. A water pump stator assembly comprising a plastic outer shell and a stator assembly fixed in the outer shell, the stator assembly comprising a stator core, a stator winding and a plastic stator inner shell, the stator core and the stator winding embedded in the stator inner shell, the stator inner shell being provided with a mounting chamber for mounting a rotor impeller assembly, a center shaft being embedded in the center of the mounting chamber, a lower flange portion adapted to the upper cover of the water pump being further provided on the upper end of the stator inner shell, and a heat dissipation metal plate being fixed on the bottom of the stator inner shell, characterized in that: The heat dissipation metal plate is provided with a protruding ring protruding upward and a capacitor mounting protrusion protruding upward, the capacitor mounting protrusion forms a capacitor mounting cavity for mounting a capacitor, a plug-in opening is arranged at the bottom of the capacitor mounting cavity, the protruding ring is in sealing fit with the stator inner housing, a communication hole in communication with the inside of the protruding ring is arranged at the bottom of the mounting cavity, a PCBA plate is fixed at the bottom of the heat dissipation metal plate, a capacitor on the PCBA plate is plugged into the capacitor mounting cavity through the plug-in opening, and heat-conducting glue is filled between the capacitor and the cavity wall of the capacitor mounting cavity. ​ 2. A water pump stator assembly as in claim 1, wherein: A plurality of clamping cavities for supporting the stator core from the inside are arranged in the stator inner housing, the clamping cavities are through at the bottom and blind at the upper end.

3. A water pump stator assembly as in claim 2, wherein: The number of the clamping cavities is three and they are circumferentially distributed.

4. A water pump stator assembly as in claim 3, wherein: The stator inner housing and the outer shell are integrally formed.

5. A water pump stator assembly as claimed in any one of claims 1 to 4, wherein: The inside of the capacitor mounting protrusion is connected with the protruding ring, and the inner protruding ring constitutes an inner side wall of the capacitor mounting cavity.

6. A water pump stator assembly as in claim 5, wherein: A glue pouring cavity is arranged at the inside end of the connector terminal.

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