Electronic water pump with control panel waterproof structure

Abstract

The invention relates to the technical field of electronic water pumps, in particular to an electronic water pump with a control panel waterproof structure, which comprises a pump shell, a control panel and an end cover, a mounting cavity is arranged in one end of the pump shell, the control panel is arranged in the mounting cavity, and the end cover is mounted on the end part of one side of the pump shell. The inner end face of the end cover is provided with a protruding part extending towards the interior of the pump shell, the protruding part is attached to the control panel, and a gap blocking mechanism is arranged between the protruding part and the inner side wall, making contact with the protruding part, of the pump shell. And heat conduction mechanisms connected with the protruding parts are arranged in the positions, corresponding to the mounting cavities, in the side wall of the pump shell and in the bottoms of the mounting cavities. The problems that a certain gap is formed between an existing pump shell and an end cover, condensate water is generated in air in the pump shell under a certain condition, and when the condensate water is attached to a printed circuit and components of a control panel, metal oxidation and corrosion are possibly caused are solved.

Description

Technical Field

[0001] The invention relates to the technical field of electronic water pumps, in particular to an electronic water pump with a control panel waterproof structure. Background Art

[0002] Electronic water pumps have high output efficiency and can achieve precise flow control. Therefore, electronic water pumps are widely used in automobiles, household appliances and industrial equipment. In particular, new energy vehicles usually have two or more electronic water pumps. Electronic water pumps are the power source of the entire cooling system of new energy vehicles. The power batteries and drive motors of new energy vehicles all need to rely on electronic water pumps to drive the coolant for circulation cooling. The control board is one of the core components of the electronic water pump. It is used to control the operation of the stator assembly so that the stator assembly can generate a rotating magnetic field, thereby driving the rotor assembly to rotate. Since the control board is equipped with the main control, power electronic devices for driving the operation of the stator assembly, and other necessary peripheral circuits, the control board has a high heat generation. In the electronic water pump in the prior art, the control board is usually installed in the pump casing. The temperature of the control board changes when it is running or stopped, which causes the temperature of the internal environment of the pump casing to change as well. In addition, there is a certain gap between the pump casing and the end cover. Under certain conditions, condensed water will be generated in the air inside the pump casing. When the condensed water adheres to the printed circuit and components of the control board, it may cause metal oxidation, corrosion and other problems, and eventually cause the control board to have an open circuit, short circuit or other faults, making it impossible to drive the stator assembly to operate normally. Summary of the invention

[0003] In order to solve the above technical problems, the present invention proposes an electronic water pump with a control panel waterproof structure.

[0004] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions:

[0005] An electronic water pump with a control board waterproof structure comprises a pump housing, a control board and an end cover, wherein an installation cavity is arranged inside one end of the pump housing, the control board is arranged in the installation cavity, the end cover is installed on one side end of the pump housing, a protrusion extending toward the inside of the pump housing is arranged on the inner end surface of the end cover, the protrusion is fitted with the control board, a gap blocking mechanism is arranged between the protrusion and the inner side wall of the pump housing in contact, and a heat conduction mechanism connected to the protrusion is arranged inside the pump housing side wall corresponding to the installation cavity and inside the bottom of the installation cavity;

[0006] After the protrusion absorbs the heat generated during the operation of the control board, the heat is conducted to the outside of the end cover for dissipation. On the other hand, the heat is conducted to the inner wall of the pump casing in contact with the protrusion, causing the gap sealing mechanism to expand due to the heat to seal the gap between the pump casing and the end cover. The heat is also conducted to the side wall of the pump casing and the bottom of the installation cavity through the heat conduction mechanism, so that the temperature of the upper, lower and surrounding areas of the installation cavity is balanced, thereby avoiding the generation of condensed water in the installation cavity due to uneven temperature, thereby achieving the purpose of waterproofing.

[0007] The beneficial effects of the present invention are:

[0008] The present invention provides an electronic water pump with a control board waterproof structure. By providing a protruding part, a gap blocking mechanism and a heat conducting mechanism, when the control board is running, the protruding part absorbs the heat generated by the control board, and on the one hand, conducts the heat to the outside of the end cover for dissipation, and on the other hand, conducts the heat to the inner wall of the pump casing in contact with it, so that the gap blocking mechanism is heated and expanded to block the gap between the pump casing and the end cover, and conducts the heat to the side wall of the pump casing and the bottom of the installation cavity through the heat conducting mechanism, so that the temperature of the upper, lower and surrounding parts of the installation cavity is balanced, and condensation water is avoided in the installation cavity due to uneven temperature, thereby achieving the purpose of waterproofing. The problem that there is a certain gap between the existing pump casing and the end cover, and condensation water is generated in the air inside the pump casing under certain conditions, and when the condensation water adheres to the printed circuit and components of the control board, it may cause metal oxidation, corrosion and other problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0010] Figure 1 It is a schematic diagram of the external structure of the present invention;

[0011] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0012] Figure 3 for Figure 2 A is an enlarged structural diagram;

[0013] Figure 4 This is a schematic diagram of the structure of the gap plugging sealing ring in the present invention;

[0014] Figure 5 It is a schematic diagram of the connection structure between the lateral heat conducting strip and the heat conducting sheet in the present invention.

[0015] In the figure: 1. Pump housing; 2. Control board; 3. End cover; 4. Mounting cavity; 5. Protrusion; 6. Annular built-in groove; 7. Gap sealing ring; 8. Isolation plate; 9. Mounting protrusion; 10. Lateral heat conduction groove; 11. Built-in heat conduction groove; 12. Lateral heat conduction strip; 13. Heat conducting sheet. DETAILED DESCRIPTION

[0016] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to the accompanying drawings and embodiments.

[0017] like Figures 1 to 5 As shown, an electronic water pump with a control board waterproof structure includes a pump housing 1, a control board 2 and an end cover 3. An installation cavity 4 is provided inside one end of the pump housing 1, the control board 2 is provided in the installation cavity 4, and the end cover 3 is installed on one side end of the pump housing 1. It is characterized in that: a protrusion 5 extending toward the inside of the pump housing 1 is provided on the inner end surface of the end cover 3, and the protrusion 5 and the end cover 3 are an integrated structure and made of the same material to facilitate heat absorption and heat dissipation. The protrusion 5 fits the control board 2, and a gap blocking mechanism is provided between the protrusion 5 and the inner side wall of the pump housing 1 in contact therewith, and a heat conduction mechanism connected to the protrusion 5 is provided inside the side wall of the pump housing 1 corresponding to the installation cavity 4 and in the bottom of the installation cavity 4.

[0018] After the protrusion 5 absorbs the heat generated during the operation of the control board 2, the heat is transferred to the outside of the end cover 3 for dissipation. On the other hand, the heat is transferred to the inner wall of the pump casing 1 in contact with the protrusion 5, so that the gap sealing mechanism expands due to the heat to seal the gap between the pump casing 1 and the end cover 3. The heat is also transferred to the side wall of the pump casing 1 and the bottom of the installation cavity 4 through the heat conduction mechanism, so that the temperature of the upper, lower and surrounding areas of the installation cavity 4 is balanced, thereby avoiding the generation of condensed water in the installation cavity 4 due to uneven temperature, thereby achieving the purpose of waterproofing.

[0019] Specifically, as a further improvement of the present embodiment, the gap plugging mechanism includes an annular built-in groove 6 provided on the inner side wall of the pump housing 1, and a gap plugging sealing ring 7 installed in the annular built-in groove 6, wherein the inner ring surface of the gap plugging sealing ring 7 is flush with the inner side wall of the pump housing 1. In the present embodiment, the gap plugging sealing ring 7 is an expanded graphite sealing ring. After being heated, the expanded graphite sealing ring expands and has an interference fit with the circumferential side wall of the protrusion 5. Thus, the purpose of plugging the gap between the pump housing 1 and the end cover 3 is achieved, thereby solving the problem that there is a certain gap between the existing pump housing and the end cover. Under certain conditions, condensed water will be generated in the air inside the pump housing. When the condensed water adheres to the printed circuit and components of the control board, it may cause metal oxidation, corrosion and other problems.

[0020] Furthermore, an isolation plate 8 is provided at the bottom of the installation cavity 4 to isolate the installation cavity 4 from the rest of the space inside the pump housing 1. A plurality of installation protrusions 9 are distributed circumferentially on the isolation plate 8, and the control board 2 is correspondingly arranged on the plurality of installation protrusions 9. In this embodiment, six installation protrusions 9 are provided, which are evenly distributed circumferentially. The six installation protrusions 9 are all made of heat-insulating material.

[0021] Specifically, as a further improvement of the present embodiment, the heat conduction mechanism includes a plurality of lateral heat conduction grooves 10 uniformly distributed circumferentially inside the side wall of the pump housing 1 corresponding to the installation cavity 4, a built-in heat conduction groove 11 arranged inside the isolation plate 8, a plurality of lateral heat conduction bars 12 arranged inside the plurality of lateral heat conduction grooves 10, and a heat conduction sheet 13 arranged inside the built-in heat conduction groove 11, the bottoms of the plurality of lateral heat conduction grooves 10 are all connected to the built-in heat conduction grooves 11, the tops are all connected to the installation cavity 4, the bottoms of the plurality of lateral heat conduction bars 12 are all connected to the heat conduction sheet 13, and the tops are all in contact with the circumferential side wall of the protrusion 5. In the present embodiment, the number of the lateral heat conduction grooves 10 and the number of the lateral heat conduction bars 12 are both twelve.

[0022] Further, the connection between the tops of the twelve lateral heat conduction grooves 10 and the installation cavity 4 is located below the gap blocking mechanism and not lower than the bottom of the protrusion 5. The tops of the twelve lateral heat conduction grooves 10 are all horizontal lateral communication openings, and the tops of the plurality of lateral heat conduction strips 12 are all L-shaped structures.

[0023] Through the above-mentioned heat conduction mechanism, part of the heat absorbed by the protrusion 5 can be conducted to the surroundings and bottom of the installation cavity 4, so that the temperature distribution in the entire space of the installation cavity 4 is balanced, avoiding the problem of condensation water caused by uneven temperature distribution.

[0024] The working principle and use process of the present invention:

[0025] During the operation of the control board 2, the protrusion 5 absorbs the heat generated by it and dissipates it through the end cover 3. At the same time, part of the heat is dispersed to the circumferential side wall of the protrusion 5, so that the temperature of the area between the circumferential side wall of the protrusion 5 and the inner wall of the pump housing 1 increases. The gap blocking sealing ring 7 located in this area expands after being heated and forms an interference fit with the circumferential side wall of the protrusion 5, thereby blocking the gap between the protrusion 5 and the inner wall of the pump housing 1, isolating the connection between the installation cavity 4 and the outside world, and achieving the purpose of waterproofing; at the same time, the top of the lateral heat conduction strip 12 In contact with the circumferential side wall of the protrusion 5, a part of the heat absorbed by the protrusion 5 is conducted to the heat conductive sheet 13 in the isolation plate 8 through the lateral heat conductive strip 12, so that the temperature of the side wall of the pump casing 1 and the isolation plate 8 corresponding to the installation cavity 4 increases until the temperature is balanced with that of the protrusion 5. At this time, the temperatures of the protrusion 5 above the installation cavity 4, the isolation plate 8 below, and the side wall of the pump casing 1 around are basically consistent, thereby achieving temperature balance, avoiding the problem of condensation water due to uneven temperature, and achieving the purpose of waterproofing.

[0026] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An electronic water pump with a control board waterproof structure, comprising a pump housing (1), a control board (2) and an end cover (3), wherein an installation cavity (4) is provided inside one end of the pump housing (1), the control board (2) is arranged in the installation cavity (4), and the end cover (3) is installed on one end of the pump housing (1), characterized in that: A protrusion (5) extending toward the interior of the pump housing (1) is provided on the inner end surface of the end cover (3); the protrusion (5) is in contact with the control board (2); a gap blocking mechanism is provided between the protrusion (5) and the inner side wall of the pump housing (1) in contact; a heat conduction mechanism connected to the protrusion (5) is provided inside the side wall of the pump housing (1) corresponding to the installation cavity (4) and inside the bottom of the installation cavity (4); After the protrusion (5) absorbs the heat generated during the operation of the control board (2), the heat is conducted to the outside of the end cover (3) for dissipation. On the other hand, the heat is conducted to the inner wall of the pump housing (1) in contact with the protrusion (5), causing the gap sealing mechanism to expand due to the heat, thereby sealing the gap between the pump housing (1) and the end cover (3). The heat is also conducted to the side wall of the pump housing (1) and the bottom of the installation cavity (4) through the heat conduction mechanism, so that the temperature of the upper, lower and surrounding areas of the installation cavity (4) is balanced, thereby preventing the installation cavity (4) from generating condensed water due to uneven temperature, thereby achieving the purpose of waterproofing.

2. The electronic water pump with a control panel waterproof structure according to claim 1, characterized in that: The protruding portion (5) and the end cover (3) are an integrated structure and are made of the same material.

3. The electronic water pump with a control panel waterproof structure according to claim 1, characterized in that: The gap sealing mechanism comprises an annular built-in groove (6) arranged on the inner side wall of the pump housing (1), and a gap sealing sealing ring (7) installed in the annular built-in groove (6), wherein the inner ring surface of the gap sealing sealing ring (7) is flush with the inner side wall of the pump housing (1).

4. The electronic water pump with a control panel waterproof structure according to claim 3, characterized in that: The gap blocking sealing ring (7) is an expanded graphite sealing ring.

5. The electronic water pump with a control panel waterproof structure according to claim 4, characterized in that: After being heated, the expanded graphite sealing ring expands and is interference-fitted with the circumferential side wall of the protruding portion (5).

6. The electronic water pump with a control board waterproof structure according to claim 1, characterized in that: An isolation plate (8) is provided at the bottom of the installation cavity (4) to isolate the installation cavity (4) from the rest of the space inside the pump housing (1); a plurality of installation protrusions (9) are distributed circumferentially on the isolation plate (8); and the control panel (2) is correspondingly arranged on the plurality of installation protrusions (9).

7. The electronic water pump with a control panel waterproof structure according to claim 6, characterized in that: The plurality of mounting protrusions (9) are all made of heat-insulating material.

8. The electronic water pump with a control panel waterproof structure according to claim 6, characterized in that: The heat conduction mechanism comprises a plurality of lateral heat conduction grooves (10) uniformly distributed circumferentially inside the side wall of the pump housing (1) corresponding to the installation cavity (4), a built-in heat conduction groove (11) arranged inside the isolation plate (8), a plurality of lateral heat conduction strips (12) arranged inside the plurality of lateral heat conduction grooves (10), and a heat conduction sheet (13) arranged inside the built-in heat conduction grooves (11); the bottoms of the plurality of lateral heat conduction grooves (10) are all connected to the built-in heat conduction grooves (11), and the tops are all connected to the installation cavity (4); the bottoms of the plurality of lateral heat conduction strips (12) are all connected to the heat conduction sheet (13), and the tops are all in contact with the circumferential side wall of the protrusion (5).

9. The electronic water pump with a control board waterproof structure according to claim 8, characterized in that: The connection point between the tops of the plurality of lateral heat conduction grooves (10) and the installation cavity (4) is located below the gap blocking mechanism and is not lower than the bottom of the protruding portion (5).

10. The electronic water pump with a control board waterproof structure according to claim 8, characterized in that: The tops of the plurality of lateral heat conduction grooves (10) are all horizontal lateral connecting openings, and the tops of the plurality of lateral heat conduction strips (12) are all L-shaped structures.

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