Electronic water pump

Abstract

The invention provides an electronic water pump which comprises a volute, a shell, a rotating shaft, a spacer bush, an impeller, a rotor and a stator, the volute is fixedly connected to the shell, the spacer bush is arranged between the volute and the shell, and a cavity between the volute and the shell is divided into a cooling cavity and a mounting cavity by the spacer bush; the end, away from the volute, of the rotating shaft is coaxially and fixedly connected with the spacer bush. A via hole is formed between the spacer bush and the rotating shaft. A liquid inlet and a liquid outlet are formed in the volute; the impeller is fixedly connected with the rotor, the impeller is rotationally arranged in the volute, the rotor is coaxially and rotationally arranged in the spacer bush, an annular overflowing gap is formed between the impeller and the spacer bush, and the outer wall of the rotor is in clearance fit with the inner wall of the spacer bush to form an annular channel; a backflow hole is formed in the rotating shaft in the axial direction in a penetrating mode. The liquid outlet, the overflowing gap, the annular channel, the backflow hole and the liquid inlet are sequentially communicated. By reducing the number of parts and optimizing the structure of the parts, the design is simplified on the premise that the cooling requirement is met, and the production and manufacturing cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of water pumps, and in particular to an electronic water pump. Background Art

[0002] Traditional mechanical water pumps rely on direct drive from the engine and cannot adjust the pump speed according to actual demand, resulting in energy waste and low efficiency. The emergence of electronic water pumps, through electronic control technology, has achieved precise control of the pump speed, improving the energy efficiency and response speed of the system.

[0003] Although electronic water pumps have many advantages, the coils of existing electronic water pumps are prone to heat up during use, which causes the temperature of the rotor and stator of the motor in the electric water pump to rise. Because the coils of the motor are generally wound by enameled wire, as the temperature rises, the risk of short circuit of the enameled wire increases, making the motor prone to burn out due to overheating. Invention patent: CN212928215U discloses a high-efficiency heat dissipation integrated disc-type brushless electronic water pump, which dissipates heat from the pump body and rotor by setting a flow channel on the pump body, and water flows into the flow channel to dissipate heat from the pump body and rotor. Although such a structural design can cool the electronic water pump to a certain extent, the structure is too complicated. On the one hand, the arrangement of the flow channel is difficult to process and manufacture, and the production cost is high. On the other hand, the diameter of the flow channel cannot be set larger, so it cannot carry more heat, and the heat dissipation effect is limited.

[0004] In summary, there is an urgent need for an electronic water pump to solve or at least partially solve the problems existing in the prior art. Summary of the invention

[0005] The present invention aims to provide an electronic water pump, aiming to solve the problem of complex design structure and high production cost in the existing technology. The specific technical solution is as follows:

[0006] An electronic water pump comprises a volute, a shell, a rotating shaft, a spacer, an impeller, a rotor and a stator, wherein the volute is fixedly connected to the shell, and a cavity is enclosed between the volute and the shell; the spacer is arranged between the volute and the shell, and the spacer divides the cavity between the volute and the shell into a cooling cavity and an installation cavity; the rotating shaft is coaxially arranged in the spacer, and one end of the rotating shaft away from the volute is fixedly connected to the spacer, and a through hole is arranged between the spacer and the rotating shaft; a liquid inlet and a liquid outlet are arranged on the volute; the impeller is coaxially fixedly connected to the rotor, the impeller is rotatably arranged in the volute, and the rotor is coaxially rotatably arranged in the spacer, an annular flow gap is arranged between the impeller and the spacer, the gap between the outer wall of the rotor and the inner wall of the spacer is matched, and an annular channel is formed, the first end of the flow gap is connected to the liquid outlet, and the second end of the flow gap is connected to the annular channel; a reflux hole is arranged axially through the rotating shaft, the first end of the reflux hole is connected to the annular channel through the through hole, and the second end of the reflux hole is connected to the liquid inlet.

[0007] Furthermore, the rotating shaft and the spacer sleeve are integrally formed.

[0008] Furthermore, a positioning step is provided on the rotating shaft, a positioning boss is provided on the volute, the positioning step and the positioning boss are arranged opposite to each other, and the impeller and the rotor are limited between the positioning step and the positioning boss.

[0009] Furthermore, an annular step is arranged on the outer periphery of one end of the impeller close to the water inlet of the volute, a clearance gap is provided between the outer periphery of the impeller and the volute, and the annular step and the clearance gap are arranged correspondingly; the outer periphery of the annular step is tightly matched with the inner wall of the volute.

[0010] Furthermore, a mounting hole is coaxially arranged in the middle of the impeller and the rotor, and the mounting hole penetrates the impeller and the rotor at the same time. The impeller and the rotor are coaxially rotatably mounted on the rotating shaft through the mounting hole.

[0011] Furthermore, a lubrication groove is provided on the inner wall of the impeller and the rotor, the lubrication groove is arranged along the axis direction of the mounting hole, and the first end of the lubrication groove is connected to the liquid inlet, and the second end of the lubrication groove is connected to the liquid outlet through an annular channel and a flow gap.

[0012] Furthermore, a plurality of lubrication grooves are arranged, and the plurality of lubrication grooves are arranged at intervals along the circumferential direction of the hole wall of the mounting hole.

[0013] Furthermore, the outer surface of the spacer is arranged with convex strips, a plurality of convex strips are arranged, and the plurality of convex strips are evenly distributed on the outer surface of the spacer, and the spacer is connected to the stator through interference fit via the convex strips.

[0014] Furthermore, it also includes a control circuit board. A accommodating cavity is arranged at the bottom of the shell, and the control circuit board is arranged on the inner wall of the accommodating cavity close to the spacer. Fins are arranged on one side of the cooling cavity close to the control circuit board. The fins are fixedly connected to the shell and extend in the direction close to the spacer.

[0015] Furthermore, a heat conducting layer is arranged between the control circuit board and the housing.

[0016] The application of the technical solution of the present invention has the following beneficial effects:

[0017] Liquid flows into the liquid inlet of the volute in the electronic water pump, and flows to the liquid outlet under the centrifugal action of the impeller. Part of the liquid passes through the flow gap, the annular channel, the through hole, the reflux hole and then flows to the liquid inlet to form a first cooling reflux channel. The outer side and the inner side of the motor rotor are cooled simultaneously through the first reflux channel, and the inner side of the stator is cooled through the first reflux channel. It should be noted that when the liquid flows through the annular channel, it can not only cool the inner side of the rotor and the inner side of the stator, but also lubricate the outer wall of the rotor and the inner wall of the sleeve under the action of the liquid. The structure is fixed by the lower end of the spacer sleeve and the rotating shaft, and the impeller and the rotor are fixedly connected together. Through such a structural form, during the installation process, it is only necessary to insert the integral sleeve formed by the sleeve and the rotating shaft into the casing, and the integral sleeve formed by the rotor and the impeller is inserted into the rotating shaft, and finally the volute is covered to complete the installation. The whole installation process is convenient, and the number of parts of the whole device is greatly reduced, the design structure is simplified, and the electronic water pump structure is simplified while meeting the internal cooling requirements of the electronic water pump, reducing the production and manufacturing costs, and improving the stability of the electronic water pump.

[0018] In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. Figure 1-Figure 9 , the present invention is further described in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 It is a schematic diagram of the overall structure of an electronic water pump of the present invention;

[0021] Figure 2 This is one of the internal structure schematic diagrams of an electronic water pump of the present invention;

[0022] Figure 3 yes Figure 2 Magnified view at A in the middle;

[0023] Figure 4 This is the second schematic diagram of the internal structure of an electronic water pump of the present invention;

[0024] Figure 5 It is an exploded view of an electronic water pump of the present invention;

[0025] Figure 6 It is a schematic diagram of the internal liquid flow direction of an electronic water pump of the present invention;

[0026] Figure 7It is a schematic diagram of the overall structure of an impeller and a rotor in an electronic water pump of the present invention;

[0027] Figure 8 It is a schematic diagram of the overall structure of a rotating shaft and a spacer sleeve in an electronic water pump of the present invention;

[0028] Fig. 9 It is a schematic diagram of the internal structure of a shell in an electronic water pump of the present invention.

[0029] Among them, 1. volute; 11. cavity; 111. cooling cavity; 112. installation cavity; 12. liquid inlet; 13. liquid outlet; 14. positioning boss; 2. shell; 21. accommodating cavity; 22. fin; 3. rotating shaft; 31. through hole; 32. return hole; 33. positioning step; 4. spacer; 41. flow gap; 42. annular channel; 43. convex strip; 5. impeller; 51. annular step; 52. clearance; 53. installation hole; 54. lubrication groove; 6. rotor; 7. stator; 8. control circuit board; 9. thermal conductive layer. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of the present invention, the present invention will be described more fully below, and preferred embodiments of the present invention are provided. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0032] Example:

[0033] See also Figure 1-Figure 9The present embodiment provides an electronic water pump, comprising a volute 1, a housing 2, a rotating shaft 3, a spacer 4, an impeller 5, a rotor 6 and a stator 7. The volute 1 is fixedly connected to the housing 2, and a cavity 11 is enclosed between the volute 1 and the housing 2; the spacer 4 is arranged between the volute 1 and the housing 2, and the spacer 4 divides the cavity 11 between the volute 1 and the housing 2 into a cooling cavity 111 and an installation cavity 112; the rotating shaft 3 is coaxially arranged in the spacer 4, and one end of the rotating shaft 3 away from the volute 1 is fixedly connected to the spacer 4, and a through hole 31 is arranged between the spacer 4 and the rotating shaft 3; the volute 1 is provided with a liquid inlet 12 and a liquid outlet 13; the impeller 5 is coaxially fixedly connected with the rotor 6, the impeller 5 is rotatably arranged in the volute 1, the rotor 6 is coaxially rotatably arranged in the spacer 4, an annular flow gap 41 is arranged between the impeller 5 and the spacer 4, the gap between the outer wall of the rotor 6 and the inner wall of the spacer 4 is matched, and an annular channel 42 is formed, the first end of the flow gap 41 is connected to the liquid outlet 13, and the second end of the flow gap 41 is connected to the annular channel 42; a reflux hole 32 is axially arranged in the rotating shaft 3, the first end of the reflux hole 32 is connected to the annular channel 42 through the through hole 31, and the second end of the reflux hole 32 is connected to the liquid inlet 12.

[0034] It should be noted that when the electronic water pump is working, the impeller 5 rotates, pumps the liquid at the liquid inlet 12 to the liquid outlet 13, and pumps it out from the liquid outlet 13; the pressure of the liquid near the liquid inlet 12 of the impeller 5 is lower than the hydraulic pressure near the liquid outlet 13 of the impeller 5.

[0035] It can be known that the liquid flows into the liquid inlet 12 of the volute 1 in the electronic water pump, and flows to the liquid outlet 13 under the centrifugal action of the impeller 5. Part of the liquid passes through the flow gap 41, the annular channel 42, the through hole 31, and the reflux hole 32 in sequence and then flows to the liquid inlet 12 to form a first cooling reflux channel. The outer side and the inner side of the motor rotor 6 are cooled simultaneously through the first reflux channel, and the inner side of the stator 7 is cooled through the first reflux channel. It should be noted that when the liquid flows through the annular channel 42, it can not only cool the inner side of the rotor 6 and the inner side of the stator 7, but also can cool the outer wall of the rotor 6 and the inner side of the sleeve under the action of the liquid. The walls are lubricated, and the structure is fixed by the spacer sleeve 4 and the rotating shaft 3 at the lower end, and the impeller 5 is fixedly connected with the rotor 6. Through such a structural form, during the installation process, it is only necessary to sleeve the whole formed by the sleeve and the rotating shaft 3 into the housing 2, and sleeve the whole formed by the rotor 6 and the impeller 5 onto the rotating shaft 3, and finally cover the volute 1 to complete the installation. The whole installation process is convenient, and the number of parts of the whole device is greatly reduced, the design structure is simplified, the electronic water pump structure is simplified while meeting the internal cooling requirements of the electronic water pump, the production and manufacturing costs are reduced, and the stability of the electronic water pump is improved.

[0036] It is worth noting that the liquid mentioned in this application can be water, antifreeze, or other liquids.

[0037] Furthermore, the rotating shaft 3 and the spacer sleeve 4 are integrally formed. Specifically, the rotating shaft 3 and the spacer sleeve 4 are produced by injection molding, and the rotating shaft 3 and the spacer sleeve 4 are made of engineering plastics.

[0038] It can be known that the structure of the mold using an integrated injection molding can better ensure the coaxiality of the rotating shaft 3 and the spacer 4 and the verticality of the end faces of the rotating shaft 3 and the spacer 4 compared to the structure of assembling and fixing two parts. Secondly, the number of parts is reduced, the difficulty of assembly is reduced, which is conducive to improving assembly efficiency and reducing production costs. It should be noted that the frame of the impeller 5 and the rotor 6 can be produced by investment casting, and then the permanent magnet needs to be embedded in the rotor 6, and the rotor 6 needs to be coated with plastic to improve the working stability of the rotor 6.

[0039] Further, a positioning step 33 is provided on the rotating shaft 3, and a positioning boss 14 is provided on the volute 1. The positioning step 33 and the positioning boss 14 are arranged opposite to each other, and the impeller 5 and the rotor 6 are limited between the positioning step 33 and the positioning boss 14. Specifically, the positioning boss 14 is fixed to the volute 1 through a connecting rod.

[0040] It can be known that the impeller 5 and the rotor 6 are axially limited by the positioning step 33 on the rotating shaft 3 and the positioning boss 14 on the volute 1 to prevent the impeller 5 and the rotor 6 from axially moving during operation.

[0041] Furthermore, an annular step 51 is arranged at the outer periphery of one end of the impeller 5 close to the water inlet of the volute 1, and a clearance gap 52 is arranged between the outer periphery of the impeller 5 and the volute 1, and the annular step 51 and the clearance gap 52 are arranged correspondingly; the outer periphery of the annular step 51 is tightly matched with the inner wall of the volute 1. Specifically, the annular step 51 is arranged at one end of the clearance gap 52 close to the liquid inlet 12, that is, the upper end of the impeller 5.

[0042] It can be known that the liquid enters the volute 1 from the liquid inlet 12 and flows toward the liquid outlet 13 under the pumping action of the impeller 5. Part of the liquid flows back to the liquid inlet 12 through the clearance gap 52 to form leakage, and such leakage directly leads to a decrease in the energy utilization rate of the electronic water pump. By setting the annular step 51, the annular step 51 reduces the gap between the impeller 5 and the volute 1, and the annular step 51 is arranged at one end of the impeller 5 close to the liquid inlet 12, thereby forming a barrier to the liquid leaking from the clearance gap 52, reducing the leakage amount and improving the energy utilization rate of the electronic water pump. It is worth noting that the annular step 51 is formed by mechanical cutting, so that the gap between the annular step 51 and the volute 1 is kept as small as possible, thereby preventing liquid leakage as much as possible.

[0043] Furthermore, a mounting hole 53 is coaxially provided in the middle of the impeller 5 and the rotor 6 . The mounting hole 53 penetrates both the impeller 5 and the rotor 6 . The impeller 5 and the rotor 6 are coaxially rotatably mounted on the rotating shaft 3 through the mounting hole 53 .

[0044] It can be known that the integral shell formed by the impeller 5 and the rotor 6 is conveniently coaxially sleeved on the rotating shaft 3 through the mounting hole 53, so as to facilitate the installation and fixation of the rotor 6 and the impeller 5.

[0045] Furthermore, a lubrication groove 54 is provided on the inner wall of the impeller 5 and the rotor 6. The lubrication groove 54 is arranged along the axial direction of the mounting hole 53, and the first end of the lubrication groove 54 is connected to the liquid inlet 12, and the second end of the lubrication groove 54 is connected to the liquid outlet 13 through the annular channel 42 and the flow gap 41.

[0046] It can be known that the liquid at the liquid inlet 12 is transported to the liquid outlet 13 by the pumping action of the impeller 5, and part of the liquid passes through the flow gap 41, the annular channel 42, the through hole 31 in turn, and flows back to the liquid inlet 12 through the lubrication groove 54, forming a second cooling reflux channel. The inner side of the motor rotor 6 is cooled through the second reflux channel, and liquid is introduced into the outer side of the rotating shaft 3 and the inner side of the rotor 6, so that when the rotor 6 and the impeller 5 rotate relative to the rotating shaft 3, a liquid film is formed on the outer surface of the rotating shaft 3 and the inner surface of the mounting hole 53, thereby reducing the friction between the outer surface of the rotating shaft 3 and the inner surface of the mounting hole 53, reducing the resistance, and improving the energy utilization rate of the electronic water pump.

[0047] Furthermore, a plurality of lubrication grooves 54 are arranged, and the plurality of lubrication grooves 54 are evenly spaced along the circumferential direction of the hole wall of the mounting hole 53 .

[0048] It can be known that by arranging the lubricating grooves 54 at even intervals along the circumferential direction of the hole wall of the mounting hole 53, the liquid can smoothly enter between the rotating shaft 3 and the rotor 6 and form a liquid film for lubrication, and the liquid directly contacts the inner wall of the rotor 6 to evenly cool the inner wall of the rotor 6. In addition, because the liquid has pressure, it will form a thrust on the rotating shaft 3 and the rotor 6. The multiple lubrication grooves 54 are evenly spaced along the circumferential direction to offset the thrusts formed by the liquid, thereby preventing the rotor 6 or the rotating shaft 3 from deflecting to one side and causing eccentric wear of the rotor 6 or the rotating shaft 3.

[0049] Furthermore, a convex strip 43 is arranged on the outer surface of the spacer 4 , and a plurality of convex strips 43 are arranged, and the plurality of convex strips 43 are evenly distributed on the outer surface of the spacer 4 . The spacer 4 is connected to the stator 7 by interference fit via the convex strips 43 .

[0050] It can be known that the stator 7 is fixedly connected in the housing 2 by means of interference fit, the spacer 4 is also coaxially sleeved in the housing 2, and the spacer 4 is coaxially sleeved in the stator 7, and the inner wall of the stator 7 is correspondingly provided with a groove, and the convex strips 43 on the outer surface of the spacer 4 are correspondingly matched and connected with the grooves in the stator 7, and the spacer 4 is circumferentially limited to prevent the rotor 6 from driving the spacer 4 and the rotating shaft 3 to rotate during the rotation process. The spacer 4 is sealed and connected to the volute 1 through a sealing ring, and the spacer 4 is sealed and connected to the housing 2 through a sealing ring.

[0051] Furthermore, it also includes a control circuit board 8. A accommodating cavity 21 is arranged at the bottom of the shell 2. The control circuit board 8 is arranged on the inner wall of the accommodating cavity 21 close to the spacer 4. A fin 22 is arranged on one side of the cooling cavity 111 close to the control circuit board 8. The fin 22 is fixedly connected to the shell 2, and the fin 22 extends in the direction close to the spacer 4.

[0052] It can be known that the control panel is used to switch the stator 7 coils on and off, thereby indirectly controlling the rotor 6 to rotate at a set rotation speed. Because the control circuit board 8 is also prone to heat, the fins 22 are provided to cool the control circuit board 8. When the liquid flows through the fins 22, the heat on the fins 22 is taken away, thereby cooling the fins 22 and the control circuit board 8.

[0053] Furthermore, a heat-conducting layer 9 is arranged between the control circuit board 8 and the housing 2. Specifically, the heat-conducting layer 9 is formed by applying heat-conducting glue.

[0054] It can be known that when the heat conducting layer 9 is not provided, there is a gap between the control circuit board 8 and the bottom wall of the housing 2, and the gap is filled with air, and the heat conducting performance of air is poor. By providing the heat conducting layer 9, the gap is filled, so that the heat generated by the control circuit board 8 can be smoothly transferred to the housing 2 through the heat conducting layer 9 and dissipated through the fins 22. The heat conducting layer 9 is composed of heat conducting glue.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electronic water pump, characterized in that: It comprises a volute (1), a housing (2), a rotating shaft (3), a spacer (4), an impeller (5), a rotor (6) and a stator (7), wherein the volute (1) is fixedly connected to the housing (2), and a cavity (11) is enclosed between the volute (1) and the housing (2); The spacer (4) is arranged between the volute (1) and the housing (2), and the spacer (4) divides the cavity (11) between the volute (1) and the housing (2) into a cooling cavity (111) and an installation cavity (112); The rotating shaft (3) is coaxially arranged in the spacer sleeve (4), and one end of the rotating shaft (3) away from the volute (1) is fixedly connected to the spacer sleeve (4), and a through hole (31) is arranged between the spacer sleeve (4) and the rotating shaft (3); The volute (1) is provided with a liquid inlet (12) and a liquid outlet (13); The impeller (5) and the rotor (6) are coaxially fixedly connected, the impeller (5) is rotatably arranged in the volute (1), and the rotor (6) is coaxially rotatably arranged in the spacer (4), an annular flow gap (41) is provided between the impeller (5) and the spacer (4), the outer wall of the rotor (6) and the inner wall of the spacer (4) are gap-matched to form an annular channel (42), the first end of the flow gap (41) is in communication with the liquid outlet (13), and the second end of the flow gap (41) is in communication with the annular channel (42); A reflux hole (32) is arranged in the rotating shaft (3) along the axial direction, a first end of the reflux hole (32) is connected to the annular channel (42) through a through hole (31), and a second end of the reflux hole (32) is connected to the liquid inlet (12).

2. An electronic water pump according to claim 1, characterized in that: The rotating shaft (3) and the spacer sleeve (4) are integrally formed.

3. An electronic water pump according to claim 1, characterized in that: The rotating shaft (3) is provided with a positioning step (33), the volute (1) is provided with a positioning boss (14), the positioning step (33) and the positioning boss (14) are arranged opposite to each other, and the impeller (5) and the rotor (6) are limited between the positioning step (33) and the positioning boss (14).

4. The electronic water pump according to claim 1, characterized in that: An annular step (51) is arranged on the outer periphery of one end of the impeller (5) close to the water inlet of the volute (1); a clearance gap (52) is provided between the outer periphery of the impeller (5) and the volute (1); the annular step (51) and the clearance gap (52) are arranged correspondingly; the outer periphery of the annular step (51) and the inner wall of the volute (1) are tightly matched.

5. The electronic water pump according to claim 1, characterized in that: The impeller (5) and the rotor (6) are coaxially provided with a mounting hole (53) in the middle thereof; the mounting hole (53) penetrates both the impeller (5) and the rotor (6); the impeller (5) and the rotor (6) are coaxially rotatably mounted on the rotating shaft (3) through the mounting hole (53).

6. An electronic water pump according to claim 5, characterized in that: Lubrication grooves (54) are provided on the inner walls of the impeller (5) and the rotor (6); the lubrication grooves (54) are arranged along the axial direction of the mounting hole (53); a first end of the lubrication groove (54) is connected to the liquid inlet (12); and a second end of the lubrication groove (54) is connected to the liquid outlet (13) via an annular channel (42) and a flow gap (41).

7. An electronic water pump according to claim 6, characterized in that: A plurality of lubrication grooves (54) are arranged, and the plurality of lubrication grooves (54) are arranged at intervals along the circumferential direction of the hole wall of the mounting hole (53).

8. The electronic water pump according to claim 1, characterized in that: The outer surface of the spacer (4) is provided with convex strips (43), a plurality of convex strips (43) are arranged, and the plurality of convex strips (43) are evenly distributed on the outer surface of the spacer (4), and the spacer (4) is connected to the stator (7) by interference fit via the convex strips (43).

9. The electronic water pump according to claim 1, characterized in that: The cooling device further comprises a control circuit board (8); a receiving cavity (21) is arranged at the bottom of the shell (2); the control circuit board (8) is arranged on the inner wall of the receiving cavity (21) close to the spacer (4); a fin (22) is arranged on one side of the cooling cavity (111) close to the control circuit board (8); the fin (22) is fixedly connected to the shell (2), and the fin (22) extends in a direction close to the spacer (4).

10. An electronic water pump according to claim 9, characterized in that: A heat conducting layer (9) is arranged between the control circuit board (8) and the housing (2).

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