An electronic water pump

Abstract

The application discloses an electronic water pump, which comprises a volute, a motor shell with an end plate, an end seat integrated with one end of the motor shell and internally forming a containing space, a waterproof sleeve assembled in the containing space, a stator assembly and a rotor assembly, and an impeller installed on the rotor assembly; a water pumping chamber is communicated with a liquid inlet, a liquid passing gap, a liquid passing groove and a liquid passing hole to form a cooling channel. The electronic water pump disclosed by the application separates the stator assembly and the rotor assembly into two areas not communicated with each other by arranging the waterproof sleeve in the motor shell, directly uses the pumping medium of the electronic water pump to cool the working temperature in the motor, and does not need to additionally arrange a power device and a cooling medium. The cooling liquid flows in the electronic water pump to take away the heat generated by the motor and other electronic devices during work, so that the cooling purpose is achieved, and the situation that the motor and other controllers are burnt or the heat protection is stopped due to the excessively high temperature rise is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water pumps, in particular to an electronic water pump. BACKGROUND

[0002] With the development of science and technology and the high demand for fuel efficiency, whether in internal combustion engines or in hybrid and new energy electric vehicles, electronic water pumps are becoming more and more important in the automobile thermal management system, especially in the field of new energy vehicles, the motor is more sensitive to temperature, and only electronic water pumps can be used to control its working temperature. At present, in order to improve the cooling efficiency of automobile engine, electronic water pump is widely used in automobile heat dissipation circulating system to provide the circulating flow power of heat dissipation medium in the heat dissipation circulating system; after the automobile starts, the electronic control components will generate a lot of heat, which must be discharged in time through the heat dissipation circulating system, so that the electronic control components can work in the normal temperature range to ensure the system reliability, and the electronic water pump is the power source of the circulating flow of the heat dissipation medium in the heat dissipation system.

[0003] In the related art, the impeller rotates in the inner cavity of the shell, and the impeller blades and the inner cavity wall of the shell have a certain sealing performance. Under the action of centrifugal force, the outlet pipe forms a positive pressure, and the inlet pipe forms a vacuum. By utilizing the pressure difference, water is actively pressed into the inner cavity of the shell to achieve the purpose of pumping. The impeller is driven to rotate by the motor rotor. Under the condition of high-speed rotation, the motor rotor and the stator generate a lot of heat, so that the temperature inside the motor is too high, which leads to the easy burning of the motor. Moreover, the circuit control components of the electronic pump are arranged close to the motor. The heat generated during the operation of the circuit control components increases the temperature of the entire circuit board mounting chamber, and under the influence of the motor, the working temperature is higher, so the circuit control components of the electronic water pump are also easy to burn.

[0004] Therefore, it is necessary to provide an electronic water pump to solve the above problems. SUMMARY

[0005] The main purpose of the present application is to provide an electronic water pump, which aims to solve the problem that the high temperature inside the existing motor leads to the easy burning of the motor and the circuit control components.

[0006] In order to achieve the above purpose, the present application provides an electronic water pump, which comprises a volute, a motor shell with an end plate, an end seat integrally combined with one end of the motor shell and forming a containing space inside, a waterproof sleeve assembled in the containing space, a stator assembly and a rotor assembly, and an impeller mounted on the rotor assembly.

[0007] The volute is connected with the other end of the motor shell to form a pump water chamber of a closed space, the rotor assembly has a rotating shaft, the rotating shaft is provided with a through liquid hole penetrating two end faces thereof, one end of the waterproof sleeve is sleeved on the end plate, and the other end of the waterproof sleeve is sleeved on the end seat, the end plate, the waterproof sleeve and the end seat are connected and separate the stator assembly and the rotor assembly in two areas which are not communicated with each other;

[0008] The end seat extends from the bottom plate thereof to the direction of the end plate to form a support with a mounting hole in the middle, the rotating shaft is mounted and fixed in the mounting hole, and the support is provided with a liquid passing groove which is communicated with the mounting hole;

[0009] One end of the rotating shaft is fixed on the end seat, and the other end penetrates through the end plate, the impeller is axially mounted on the rotating shaft and located in the pump water chamber;

[0010] The end plate is provided with a liquid inlet communicated with the pump water chamber, and a liquid passing gap communicated with the liquid inlet is formed between the outer wall of the rotor assembly and the inner wall of the waterproof sleeve;

[0011] The pump water chamber is communicated with the liquid passing gap, the liquid passing groove and the through liquid hole through the liquid inlet to form a cooling channel.

[0012] Preferably, the end plate extends in the direction of the end seat to form a mounting seat, and the two ends of the waterproof sleeve are sleeved on the mounting seat and the support respectively.

[0013] Preferably, sealing rings are arranged between the waterproof sleeve and the support and between the waterproof sleeve and the mounting seat.

[0014] Preferably, the waterproof sleeve comprises a sleeve body and first and second connecting ends which are bent and extended from two ends of the sleeve body;

[0015] The first connecting end is sleeved on the mounting seat, and the cross section of the first connecting end is in a stepped structure.

[0016] The second connecting end is sleeved on the support, and the second connecting end is provided with a rolled edge which is turned up towards the outer periphery of the sleeve body.

[0017] Preferably, the liquid passing groove comprises a first groove body which extends from the top of the support to the opposite bottom of the support and a second groove body which extends from the center of the support to the first groove body and is communicated with the first groove body;

[0018] The first groove body and the second groove body are a plurality of, and the plurality of first groove bodies and the plurality of second groove bodies are circumferentially distributed on the support.

[0019] Preferably, the rotor assembly comprises a rotor core and a sealing sleeve wrapped outside the rotor core, and a gap formed between the sealing sleeve and the waterproof sleeve is the liquid passing gap.

[0020] Preferably, the impeller comprises a hub, an impeller frame and a plurality of blades, each of the blades is arranged at intervals along a circumferential direction of the impeller frame, the intervals between the blades arranged at intervals are non-equal intervals different from each other, the hub is axially fixed on the rotating shaft, and a top of the impeller frame is concave downward to form an annular groove, and the volute is embedded in the annular groove.

[0021] Preferably, the cooling channel further comprises a liquid outlet channel, the support bottom is provided with a liquid outlet hole, an inner portion of the bottom plate is provided with a liquid outlet groove in communication with the liquid outlet hole, an inner portion of a side wall of the motor shell forms a liquid outlet channel, the mounting hole is in communication with the liquid outlet channel through the liquid outlet groove, and a liquid outlet gap is formed between the volute and the end plate, and the liquid outlet channel is in communication with the pump water chamber through the liquid outlet gap.

[0022] Preferably, the sealing member is further arranged between the volute and the motor shell and between the end seat and the motor shell.

[0023] Preferably, the sealing member is a sealing ring.

[0024] Compared with the prior art, the electronic water pump has the following beneficial effects:

[0025] The electronic water pump provided by the application separates the stator assembly and the rotor assembly into two areas not in communication with each other by arranging the waterproof sleeve in the motor shell, the cooling channel is in communication with the pump water chamber, the liquid passing gap, the liquid passing groove and the liquid passing hole, the cooling liquid in the cooling channel is the cooling medium in the pump water chamber, the working temperature in the motor is directly cooled by the pumping medium of the electronic water pump, and there is no need to additionally arrange a power device and a cooling medium, thereby saving energy and protecting the environment. The cooling channel forms a self-cooling circulation system in the water pump, the cooling liquid flows in the electronic water pump to take away the heat generated by the motor and other electronic devices during operation, thereby achieving the purpose of cooling, the cooling channel flows through the inside of the motor, thereby reducing the working temperature of the motor, avoiding the situation that the motor and other controllers are burnt out or the heat protection is stopped due to excessively high temperature rise, and thereby reducing the risk of damage or stoppage of the water pump. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only need to be some embodiments of the present application, and do not need to be all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0027] Figure 1 A perspective view of the electronic water pump provided by the present application is shown in the figure.

[0028] Figure 2 A partial structure exploded view of the electronic water pump is shown in the figure. Figure 1

[0029] Figure 3 A sectional view of the electronic water pump is shown in the figure. Figure 1

[0030] Figure 4 An enlarged view of the structure of part A is shown in the figure. Figure 3

[0031] Figure 5 A structure schematic view of the motor shell is shown in the figure. Figure 3

[0032] Figure 6 A structure view of the end seat is shown in the figure. Figure 3

[0033] Figure 7 A structure schematic view of the waterproof sleeve is shown in the figure. Figure 3

[0034] Figure 8 A structure view of the impeller is shown in the figure. Figure 3 The purposes, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings.

[0035] DETAILED DESCRIPTION

[0036] It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0038] ​​​​​​​It should be noted that all the direction indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the direction indications will also change accordingly.

[0039] In addition, the descriptions involving "first", "second", etc. in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0040] Please refer to Figures 1 to 4 The present application provides an electronic water pump. The electronic water pump comprises a volute 1, a motor shell 2 with an end plate 21, an end seat 3 integrated with one end of the motor shell 2 and forming an accommodation space inside, a waterproof sleeve 4 assembled in the accommodation space, a stator assembly 5 and a rotor assembly 6, and an impeller 7 installed on the rotor assembly 6. The volute 1 and the end seat 3 are respectively installed on both ends of the motor shell 2, and the three are integrated.

[0041] The volute 1 and the other end of the motor shell 2 are connected to form a pump water chamber 811 of a closed space, and the impeller 7 is installed in the pump water chamber 811. The rotor assembly 6 has a hollow rotating shaft 61, and the rotating shaft 61 is provided with a through liquid hole 63 penetrating through two end faces thereof. One end of the waterproof sleeve 4 is sleeved on the end plate 21, and the other end is sleeved on the end seat 3. The end plate 21, the waterproof sleeve 4 and the end seat 3 are connected and separate the stator assembly 5 and the rotor assembly 6 in two non-communicating areas. The two areas separated by the waterproof sleeve 4 are a water inlet cooling area and a dry area, which are not communicated with each other, and the water inlet cooling area has good sealing performance to prevent the cooling liquid entering the area from entering the dry area. The stator assembly 5 is located in the dry area, therefore, the dry area must be kept waterproof inside to avoid short circuit of the power coil of the rotor assembly 6.

[0042] Please refer to Figure 6 The end seat 3 extends from its bottom plate to the direction of the end plate 21 to form a support 33 with a mounting hole 31 in the middle, and the rotating shaft 61 is installed and fixed in the mounting hole 31. The support 33 is provided with a liquid passing groove 35, and the liquid passing groove 35 is communicated with the mounting hole 31 to form a channel for liquid flow.

[0043] One end of the rotating shaft 61 is fixed on the end seat 3, and the other end passes through the end plate 21. The rotating shaft 61 passes through the motor shell 2, and the impeller 7 is axially installed on the rotating shaft 61 and located in the pump water chamber 811. The rotor assembly 6 drives the impeller 7 to rotate, and the cooling medium entering the pump water chamber 811 is pumped out.

[0044] As shown in Figure 3 and Figure 5 The end plate 21 is provided with a liquid inlet 23 communicating with the pump water chamber 811. A liquid passing gap 9 communicating with the liquid inlet 23 is formed between the outer wall of the rotor assembly 6 and the inner wall of the waterproof sleeve 4. The cooling medium entering the pump water chamber 811 flows into the liquid passing gap 9 through the liquid inlet 23. The pump water chamber 811 communicates with the liquid passing gap 9, the liquid passing groove 35 and the liquid passing hole 63 through the liquid inlet 23 to form a cooling channel. The cooling liquid entering from the liquid inlet 23 is discharged from the liquid passing hole 63 to the pumping chamber after passing through the liquid passing gap and the liquid passing groove 35, so that the cooling channel forms a self-cooling circulation system through the inside of the water pump. The cooling liquid flows in the electronic water pump to take away the heat generated by the motor and other electronic devices during operation to achieve the purpose of cooling.

[0045] In the related art, during the rotation of the impeller 7 in the cavity of the shell, the blades 75 of the impeller 7 have a certain sealing performance with the cavity wall of the shell. Under the action of centrifugal force, the outlet pipeline forms positive pressure, and the inlet pipeline forms vacuum. The water is actively pressed into the cavity of the shell by utilizing the pressure difference. This process often causes the timing of forming the cooling water circulation to be delayed due to the machining precision problem of the blades 75 of the impeller 7 and the shell matching surface, thereby affecting the internal cooling speed of the water pump and further affecting the overall performance of the electronic water pump. The cooling channel of the electronic water pump of the present application enters from the pump water cavity, and the cooling liquid of the cooling channel is the cooling medium pumped by the electronic water pump. No additional cooling liquid is needed. The cooling liquid is delivered into the cooling channel at the same time as the electronic water pump pumps the cooling medium during the operation of the electronic water pump. Its function is realized by improving the structure of the pump itself. While improving the cooling effect, the structure size of the pump itself can be compacted and the volume can be reduced. Especially in the working condition of smaller volume and higher power requirement, the performance of the electronic water pump of the present application is particularly prominent.

[0046] As shown in Figure 6As shown, in particular, the end plate 21 extends in the direction of the end base 3 to form a mounting seat 211, and the two ends of the waterproof sleeve 4 are respectively sleeved on the mounting seat 211 and the mounting seat 33. The mounting seat 211, the waterproof sleeve 4 and the mounting seat 33 are connected into one body, and the mounting seat 211, the waterproof sleeve 4 and the mounting seat 33 form an enclosed internal space, which is a water inlet cooling area, and the outside thereof is a dry area.

[0047] Please refer to Figure 2 and Figure 3 Further, the end base 3 away from the motor shell 2 also has a containing cavity 38, which is closed by the cover plate 12 assembled on the motor shell 2, and the circuit control board 40 is arranged in the containing cavity 38 and fixed on the bottom plate of the end base 3. It can be understood that the cooling liquid of the cooling channel flows through the bottom of the end base 3, and the cooling effect is transmitted through the bottom plate, so that the circuit control board 40 installed on the bottom plate is cooled, thereby reducing the working temperature of the circuit control board 40. Therefore, the cooling channel can not only reduce the stability of the motor, but also reduce the temperature of the circuit control board. The electronic water pump of the present application does not need to increase the volume, improves the heat dissipation performance of the electronic water pump, reduces the working temperature of the controller, ensures the use performance of the electronic water pump, increases the service life of the controller, and has the advantages of simple process, low cost, good sealing effect, not easy to damage the water pump, and greatly prolongs the service life of the electronic water pump.

[0048] Please refer to Figure 6 The liquid passing groove 35 includes a first groove body 351 recessed from the top of the support 33 to the opposite bottom, and a second groove body 353 communicating the mounting hole 31 and the first groove body 351.

[0049] Among them, the first groove body 351 and the second groove body 353 are both multiple, and multiple first groove bodies 351 and second groove bodies 353 are circumferentially distributed on the support 33.

[0050] It can be understood that, in order to make the waterproof performance between the two areas isolated by the waterproof sleeve 4 better, the waterproof sleeve 4 and the support 33, and the waterproof sleeve 4 and the mounting seat 211 are both provided with sealing rings. The sealing ring greatly improves the isolation performance between the two areas, so that the waterproof performance between the isolated areas is better.

[0051] As Figure 7As shown, further, the waterproof sleeve 4 comprises a sleeve body 41 and a first connecting end 43 and a second connecting end 45 bent and extended from two ends of the sleeve body 41. The first connecting end 43 is sleeved on the mounting seat 211, and the first connecting end 43 has a stepped structure in cross section. The second connecting end 45 is sleeved on the support 33, and the second connecting end 45 is provided with a rolled edge turned up towards the outer periphery of the sleeve body 41. The first connecting end 43 and the mounting seat 211 are sealed by a sealing ring.

[0052] It can be understood that the waterproof sleeve 4 as a sealing component has a shape to match the structure between the stator assembly and the rotor assembly. Since the matching position of the stator assembly and the rotor assembly is linear, the sleeve body 41 is a straight cylinder.

[0053] The stator assembly 5 and the rotor assembly 6 form a motor, wherein the stator assembly 5 comprises a stator core, an enameled wire, a wire passing frame and a framework, and the enameled wire coil is wound on the stator core and the framework. The rotor assembly 6 is rotatably arranged in the motor shell 2. The rotor assembly 6 comprises a rotor core 64 and a sealing sleeve 65 wrapped outside the rotor core 64, and the gap formed between the sealing sleeve 65 and the waterproof sleeve 4 is the liquid passing gap 9. The sealing sleeve 65 is wrapped outside the rotor core 64 and is welded integrally with the rotor core 64. The sealing sleeve 65 wraps the rotor core 64 inside and forms a seal to prevent water from entering the inside of the rotor core 64.

[0054] The gap is formed between the sealing sleeve 65 and the waterproof sleeve 4, and the cooling liquid flows through the gap to reduce the temperature between the rotor assembly 6 and the stator assembly 5, thereby reducing the working temperature of the motor, reducing the phenomenon of burning out of the motor due to the working temperature being too high, improving the service life of the motor, increasing the stability of the water pump, and also improving the service life of the water pump.

[0055] As Figure 8As shown, the impeller 7 includes a hub 71, an impeller frame 73, and a plurality of blades 75, each of the blades 75 is arranged at intervals along the circumferential direction of the impeller frame 73, the intervals between each of the blades 75 arranged at intervals are non-equidistant intervals different from each other, so that the noise generated when the impeller 7 rotates can be reduced by a simple structure. The hub 71 is axially fixed on the rotating shaft 61, the top of the impeller frame 73 is concave to form an annular groove, and the volute 1 is embedded in the annular groove. The blade 75 adopts the design of the impeller 7 with a guiding function, which can easily form a negative pressure in the inner cavity of the volute 1 after the impeller 7 starts, and the self-suction performance is quickly realized without lag phenomenon. On the other hand, the cooling liquid is guided by the impeller 7 before entering the shell, and enters the inner cavity of the volute 1 along the direction of the blade 75, avoiding the instantaneous noise generated by the high-speed cooling water directly impacting the impeller 7. The structural design of the impeller 7 with a guiding function makes the cooling liquid faster under the action of the impeller 7, the flow rate of the cooling liquid is faster, and the flow rate of the cooling liquid entering the cooling channel is faster, so that the cooling speed of the motor inside is faster, thereby effectively improving the overall performance of the water pump.

[0056] As shown in the drawings, Figure 3 As a preferred embodiment of the present application, the cooling channel further comprises a liquid outlet channel, the bottom of the support 33 is provided with a liquid outlet hole 331, the inside of the bottom plate is provided with a liquid outlet groove 333 in communication with the liquid outlet hole 331, the side wall of the motor shell 2 body is formed with a liquid outlet channel, the mounting hole 31 is in communication with the liquid outlet channel through the liquid outlet groove 333, a liquid outlet gap 10 is formed between the volute 1 and the end plate 21, and the liquid outlet channel is in communication with the pump water chamber 811 through the liquid outlet gap 10. A part of the cooling liquid entering the cooling channel is discharged from the through liquid hole 63 in the rotating shaft 61, and the other part is discharged from the liquid outlet channel, thereby increasing the discharge amount and the discharge speed. It can be understood that the increase of the discharge speed will increase the circulation speed of the cooling channel, so that the cooling speed is increased. Therefore, the setting of the liquid outlet channel greatly increases the circulation speed of the cooling channel and improves the cooling effect.

[0057] As shown in the drawings, Figure 2 As a preferred embodiment of the present application, the electronic water pump further comprises a sealing element 13 arranged between the volute 1 and the motor shell 2, and between the end seat 3 and the motor shell 2. The arrangement of the sealing element 13 makes the electronic water pump meet the waterproof requirement and ensures normal operation in water.

[0058] Specifically, in the present embodiment, the sealing element 13 is a sealing ring.

[0059] The electronic water pump provided by the application separates the stator assembly 5 and the rotor assembly 6 into two non-communicating areas by arranging the waterproof sleeve 4 in the motor shell 2, the cooling channel communicates the pump water chamber 811, the liquid passing gap 9, the liquid passing groove 35 and the liquid passing hole 63, the cooling liquid in the cooling channel is the cooling medium in the pump water chamber 811, the working temperature in the motor is directly cooled by the pumping medium of the electronic water pump, and the power device and the cooling medium are not additionally arranged, energy saving and environmental protection are achieved. The cooling channel forms a self-cooling circulation system in the water pump, the cooling liquid flows in the electronic water pump to take away the heat generated by the motor and other electronic devices during work, so that the cooling purpose is achieved, the cooling channel flows through the inside of the motor, the working temperature of the motor is reduced, the situation that the motor and other controllers are burnt or the heat protection is stopped due to the excessively high temperature rise is avoided, and the risk of damage or stop of the water pump is reduced.

[0060] The above is only the preferred embodiment of the application, and does not limit the patent range of the application, and any equivalent structure or equivalent flow transformation obtained by using the content of the specification and the drawings, or direct or indirect application in other related technical fields, is also included in the patent protection range of the application.

Claims

1. An electronic water pump, characterized in that, It includes a volute, a motor housing with an end plate, an end seat integrally assembled with one end of the motor housing and having an internal accommodating space, a waterproof sleeve assembled in the accommodating space, a stator assembly and a rotor assembly, and an impeller mounted on the rotor assembly. The volute and the other end of the motor housing are connected to form a closed pump chamber. The rotor assembly has a rotating shaft with liquid passage holes through its two end faces. One end of the waterproof sleeve is fitted onto the end plate and the other end is fitted onto the end seat. The end plate, the waterproof sleeve, and the end seat are connected and separate the stator assembly and the rotor assembly into two non-communicating areas. The end seat extends from its base plate toward the end plate to form a support with a mounting hole in the middle. The rotating shaft is fixed to the mounting hole. A liquid passage groove is provided on the support, and the liquid passage groove communicates with the mounting hole. One end of the rotating shaft is fixed to the end seat, and the other end passes through the end plate. The impeller is axially mounted on the rotating shaft and located in the pump chamber. The end plate is provided with a liquid inlet communicating with the pump water chamber, and a liquid passage gap communicating with the liquid inlet is formed between the outer wall of the rotor assembly and the inner wall of the waterproof sleeve. The pump chamber is connected to the liquid inlet, the liquid passage gap, the liquid passage tank and the liquid passage hole to form a cooling channel; The liquid passage includes a first groove recessed from the top of the support toward its opposite bottom and a second groove connecting the mounting hole and the first groove; wherein there are multiple first grooves and multiple second grooves, and the multiple first grooves and second grooves are circumferentially distributed on the support. The cooling channel also includes a liquid outlet channel. The bottom of the support is provided with a liquid outlet hole. The bottom plate is provided with a liquid outlet groove communicating with the liquid outlet hole. The side wall of the motor housing is formed with a liquid outlet channel. The mounting hole is connected to the liquid outlet channel through the liquid outlet groove. A liquid outlet gap is formed between the volute and the end plate. The liquid outlet channel is connected to the pump water chamber through the liquid outlet gap.

2. The electronic water pump according to claim 1, characterized in that, The end plate extends toward the end seat to form a mounting base, and the two ends of the waterproof sleeve are respectively fitted onto the mounting base and the support.

3. The electronic water pump according to claim 2, characterized in that, A sealing ring is provided between the waterproof sleeve and the support, and between the waterproof sleeve and the mounting base.

4. The electronic water pump according to claim 2, characterized in that, The waterproof sleeve includes a sleeve body and a first connecting end and a second connecting end that bend and extend from both ends of the sleeve body. The first connecting end is sleeved on the mounting base, and the cross-section of the first connecting end has a stepped structure. The second connecting end is sleeved on the support, and the second connecting end is provided with a rolled edge that is turned up toward the outer periphery of the sleeve body.

5. The electronic water pump according to claim 1, characterized in that, The rotor assembly includes a rotor core and a sealing sleeve that wraps around the rotor core. The gap formed between the sealing sleeve and the waterproof sleeve is the liquid passage gap.

6. The electronic water pump according to claim 1, characterized in that, The impeller includes a hub, an impeller frame, and multiple blades. Each blade is spaced apart from the others along the circumference of the impeller frame. The spacing between the spaced blades is non-equidistant and not the same. The hub is axially fixed to the rotating shaft. The top of the impeller frame is recessed downward to form an annular groove, and the volute is embedded in the annular groove.

7. The electronic water pump according to any one of claims 1-6, characterized in that, It also includes a seal disposed between the volute and the motor housing, and between the end seat and the motor housing.

8. The electronic water pump according to claim 7, characterized in that, The sealing element is a sealing ring.

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