An electric pump

Abstract

The application discloses an electric pump, which comprises a rotating assembly and a shaft, the rotating assembly can rotate around the shaft, the rotating assembly comprises a sleeve, the sleeve comprises a water passing groove and a hole part, the hole part is arranged along the axial direction of the sleeve and penetrates the upper and lower end surfaces of the sleeve, part of the shaft is located in the hole part, the part of the shaft is in clearance fit with the wall surface corresponding to the hole part, the water passing groove is arranged in a recessed mode from the wall surface corresponding to the hole part, the water passing groove penetrates the upper and lower end surfaces of the sleeve along the axial direction of the electric pump, the shape of the water passing groove is in a spiral mode, the sleeve is made of plastic material, and the water passing groove is integrally injection molded with the sleeve. In this way, the noise of the electric pump can be reduced.

Description

Technical Field

[0001] This application relates to a fluid pump, and more particularly to an electric pump for a vehicle thermal management system. Background Technology

[0002] An electric pump includes a rotor assembly and a shaft. The rotor assembly includes a bushing, with a portion of the shaft located inside the bushing and rotating relative to it. During operation, the shaft and the bushing bore of the bushing rub against each other, generating heat. Currently, the rotor assembly is equipped with a water channel through which the working medium can flow. The working medium can contact at least a portion of the bushing, thereby carrying away the heat from the bushing and dissipating heat from it. However, this increases the noise of the electric pump. Utility Model Content

[0003] The purpose of this application is to provide an electric pump that helps reduce the noise of the electric pump.

[0004] To achieve the above objectives, one technical solution of this application is as follows:

[0005] An electric pump includes a rotating assembly and a shaft. The rotating assembly is rotatable around the shaft. The rotating assembly includes a bushing, which includes a water passage groove and a hole. The hole extends through the upper and lower end faces of the bushing along its axial direction. Part of the shaft is located in the hole, and the part of the shaft is clearance-fitted with the wall surface corresponding to the hole. The water passage groove is recessed from the wall surface corresponding to the hole and extends through the upper and lower end faces of the bushing along the axial direction of the electric pump. The water passage groove is spiral in shape. The bushing is made of plastic, and the water passage groove and the bushing are integrally injection molded.

[0006] The present application provides an electric pump with a spiral water passage groove on the shaft sleeve. It can be understood that the water passage groove is spiral in shape. Compared with the prior art, when the rotor assembly rotates around the shaft, the water passage groove of the present application makes uniform contact with the shaft, which helps to widen the frequency band of the collision noise generated by the contact between the water passage groove and the shaft, thereby helping to reduce the noise of the electric pump. Attached Figure Description

[0007] Figure 1 This is a three-dimensional structural schematic diagram of one embodiment of the electric pump of this application;

[0008] Figure 2 yes Figure 1 A three-dimensional cross-sectional view of the electric pump.

[0009] Figure 3 yes Figure 1 A three-dimensional structural diagram of the rotating component;

[0010] Figure 4 yes Figure 3 A three-dimensional cross-sectional view of the rotating component.

[0011] Figure 5 yes Figure 3 A three-dimensional cross-sectional view of the rotating component from another perspective;

[0012] Figure 6 yes Figure 3 A three-dimensional structural diagram of the central bushing;

[0013] Figure 7 yes Figure 6 A three-dimensional structural diagram of the central bushing from another perspective;

[0014] Figure 8 yes Figure 6 Top view of the center bushing;

[0015] Figure 9 yes Figure 6 A three-dimensional cross-sectional view of the central bushing;

[0016] Figure 10 yes Figure 6 A three-dimensional cross-sectional view of the central shaft sleeve from another perspective;

[0017] In the attached image:

[0018] 100. Electric pump;

[0019] 1. Impeller cavity cover; 11. Inlet section; 12. Outlet section; 13. Main body section;

[0020] 2. Rotating component;

[0021] 21. Rotor assembly; 211. First injection molded body; 212. Second injection molded body; 2121. Lower cover plate; 2122. Encasing part; 213. Bushing; 2130. Body part; 2131. Limiting part; 2131a. Upper end face; 2131b. Lower end face; 2131c. Stepped surface; 2132. Water channel; 2133. Hole part; 2134. Recess part; 214. Rotor; 2141. Rotor core; 2142. Permanent magnet; 215. Connecting part;

[0022] 22. Impeller assembly; 221. Top cover plate; 222. Blades; 223. Inlet;

[0023] 3. Stator assembly;

[0024] 4. Isolation sleeve; 41. Shaft;

[0025] 5. Motor cavity cover;

[0026] 6. Circuit board assembly;

[0027] 101. Pump inner cavity; 101a. First chamber; 101b. Second chamber; Detailed Implementation

[0028] The specific embodiments are described below with reference to the accompanying drawings:

[0029] The electric pump in the following embodiments can provide flow power for the working medium of the automotive thermal management system. The working medium can be a 50% aqueous solution of ethylene glycol or water, or other substances.

[0030] See Figures 1 to 2 As shown, this application provides an electric pump 100, which includes an impeller chamber cover 1, a rotating assembly 2, a stator assembly 3, an isolation sleeve 4, a motor chamber cover 5, and a circuit board assembly 6. The electric pump 100 also has a pump inner cavity 101, which includes a first chamber 101a and a second chamber 101b. The first chamber 101a and the second chamber 101b are not connected. When the electric pump 100 is working, the first chamber 101a has a working medium flowing through it, while the second chamber 101b does not have a working medium flowing through it. Figure 2 As shown, the impeller cavity cover 1 and the motor cavity cover 5 are sealed and fixed, and the isolation sleeve 4 and the motor cavity cover 5 are also sealed and fixed. It should be noted that this sealing and fixing refers to preventing the working medium from leaking to the outside of the electric pump 100 when the electric pump 100 is operating. The motor cavity cover 5 is provided with a second opening 52, which is specifically located at... Figure 2 At the upper end of the motor cavity cover 5, the impeller cavity cover 1 covers the second opening 52, and the impeller cavity cover 1 and the motor cavity cover 5 can enclose and form the pump inner cavity 101. The isolation sleeve 4 is disposed in the motor cavity cover 5 and covers the second opening 52. The isolation sleeve 4 has an open end facing the impeller cavity cover 1. The isolation sleeve 4 divides the pump cavity into a first chamber 101a and a second chamber 101b. The inner cavity of the isolation sleeve 4 can form at least a part of the first chamber 101a.

[0031] Specifically, the rotating assembly 2 and at least a portion of the shaft 41 are located in the first chamber 101a, while at least a portion of the stator assembly 3 and at least a portion of the circuit board assembly 6 are located in the second chamber 101b. In this embodiment, the stator assembly 3 and the circuit board assembly 6 are located in the second chamber 101b. The stator assembly 3 and the circuit board assembly 6 do not contact the working medium, which helps to avoid short circuits. The shaft 41 is limited or fixedly connected to the isolation sleeve 4. The rotating assembly 2 is located on the outer periphery of the shaft 41, and the stator assembly 3 is electrically connected to the circuit board assembly 6. When the electric pump 100 is working, the circuit board assembly 6 controls the current of the stator assembly 3, thereby controlling the excitation magnetic field generated by the stator assembly 3. The rotating assembly 2 rotates under the action of the excitation magnetic field. Specifically, the rotating assembly 2 revolves around the shaft 41 under the action of the excitation magnetic field. Of course, as in other embodiments, the rotating assembly 2 and the shaft 41 are fixedly connected, and the shaft 41 rotates together with the rotating assembly 2.

[0032] The rotating assembly 2 includes a rotor assembly 21 and an impeller assembly 22. A stator assembly 3 is arranged around the rotor assembly 21 and cooperates with it. When energized, the stator assembly 3 drives the rotor assembly 21 to rotate. The rotor assembly 21 and the impeller assembly 22 are connected, so when the rotor assembly 21 rotates, it also drives the impeller assembly 22 to rotate. The impeller assembly 22 can rotate around a shaft 41. When the impeller assembly 22 rotates, it drives the flow of the surrounding working medium. Therefore, the impeller assembly 22 needs to be in contact with the fluid medium, while the stator assembly 3 needs to be insulated from the fluid medium.

[0033] It is understood that in this embodiment, the rotating component 2, the stator component 3, and the shaft 41 are coaxially arranged. The extension direction of the rotation axis of the rotating component 2 is defined as the axial direction. The motor cavity cover 5 can be provided with the aforementioned second opening 52 at one end of the axial direction. The impeller cavity cover 1 is axially mounted on the second opening 52. The impeller cavity cover 1 includes a main body 13, an inlet 11, and an outlet 12. Both the inlet 11 and the outlet 12 are located in the main body 13 and communicate with the inner cavity of the main body 13. Specifically, the inlet 11 is a tubular structure protruding axially from the main body 13 of the impeller cavity cover 1. The outlet 12 is also a tubular structure, and the outlet 12 is approximately perpendicular to the inlet 11. Figure 3 As shown, when the fluid medium enters from the inlet 11, the impeller assembly 22 rotates, thereby driving the fluid medium in the first chamber 101a to flow out from the side outlet 12. It can be seen that the arrangement of the inlet 11 and outlet 12 is not limited to this; any arrangement that cooperates with the impeller assembly 22 to draw in and discharge the fluid medium is acceptable. Of course, as another implementation, the electric pump 100 may not include the impeller chamber cover 1, which is integrated into an external structure. This arrangement is more conducive to the integrated design of the electric pump 100, making its structure more compact and facilitating miniaturization and weight reduction.

[0034] Because the rotor rotates at high speed around the shaft, the gap between the rotor sleeve and the shaft is very small, generating a large amount of heat during rotation. If the water pump operates at room temperature or in a low-temperature environment, the heat can be conducted away through the liquid in the gap between the sleeve and the shaft. However, if the water pump operates in a high-temperature environment, the small gap between the sleeve and the shaft prevents timely heat dissipation, causing the temperature of various components and electronic parts of the water pump to rise, directly affecting the reliability and lifespan of the pump. The inventors have discovered that by setting a water channel on the sleeve, coolant flows through the channel during rotor operation, carrying away the heat between the sleeve and the shaft, thus achieving heat dissipation for the rotor assembly. Currently, the water channel is generally a straight channel, but this type of channel can affect the noise of the electric pump.

[0035] As one implementation method, see Figures 1 to 10As shown, the electric pump 100 includes a rotating assembly 2 and a shaft 41. The rotating assembly 2 can rotate around the shaft 41. Specifically, in this embodiment, as shown... Figure 2 As shown, shaft 41 is injection molded and fixed to isolation sleeve 4. Rotating component 2 is clearance-fitted to shaft 41. When the electric pump is running, rotating component 2 rotates around shaft 41. Rotating component 2 includes bushing 213, which includes a hole 2133. Part of shaft 41 is located in the cavity corresponding to hole 2133 and clearance-fitted to the inner circumferential surface of hole 2133. Bushing 213 has a water passage groove 2132. Along the axial direction of bushing 213, water passage groove 2132 penetrates the upper and lower end faces of bushing 213. It should be noted that the axial direction of bushing 213 is the same as the axial direction of electric pump 100. Figure 2 As shown, the axial direction of the electric pump 100 is the same as the height direction H of the electric pump 100. It can be understood that due to the small gap between the bushing 213 and the shaft 41, the rotating assembly 2 generates a large amount of heat during rotation. By providing a water channel 2132 on the bushing 213, which extends through the upper and lower end faces of the bushing 213, coolant can flow through the water channel 2132, carrying away the heat between the bushing 213 and the shaft 41, thus achieving heat dissipation. The water channel 2132 is spiral-shaped, and the bushing 213 is made of plastic. The material used, with the water channel 2132 and shaft sleeve 213 integrally injection molded, serves two main purposes. First, compared to a straight-groove water channel, the rotor assembly experiences minor collisions with the water channel with each revolution. At a constant rotor speed, the interval between these collisions is fixed, leading to higher noise peaks in the electric pump and thus increasing its noise level. The spiral-shaped water channel, however, distributes these periodic collisions evenly, homogenizing the noise peaks and reducing them. This method helps reduce the noise of the electric pump. Second, some of the working medium can flow into the water channel, facilitating shaft lubrication.

[0036] Specifically, as one implementation method, in this embodiment, the bushing 213 is made of plastic, and the water channel 2132 and the bushing 213 are integrally formed by injection molding. It can be understood that plastic material, compared to graphite material, can help reduce the cost of the electric pump. Integrating the water channel 2132 and the bushing 213 by injection molding helps reduce the risk of damage caused by secondary processing on the inner surface of the bushing's hole. Of course, in other embodiments, the bushing 213 can be made of plastic or graphite, and the water channel 2132 can be integrally formed with the bushing 213 or formed by machining; these will not be elaborated upon here.

[0037] As one implementation method, see Figures 2 to 5The rotor assembly 21 includes a first injection-molded body 211, which includes a bushing 213, a rotor 214, and a connecting portion 215. The rotor 214 is made of a permanent magnet material. The rotor 214 is located on the outer periphery of the bushing 213. The connecting portion 215 connects the rotor 214 and the bushing 213. The connecting portion 215 is made of plastic. In this embodiment, the first injection-molded body 211 is formed by injection molding using the rotor 214 and the bushing 213 as injection-molded inserts. The connecting portion 215 is formed by injecting plastic. The first injection-molded body 211 is a single integral part. A second injection-molded body 212 is formed by injection molding using the first injection-molded body 211 as an insert. See also... Figure 3 and Figure 4 The second injection-molded body 212 includes a lower cover plate 2121 and a wrapping portion 2122, the wrapping portion 2122 wrapping a portion of the outer peripheral surface of the first injection-molded body 211; in this embodiment, the impeller assembly 22 also includes an upper cover plate 221 and blades 222. Along the axial direction of the rotor assembly 21, the lower cover plate 2121 is closer to the rotor 214 than the blades 222. In this embodiment, the upper cover plate 221 and the blades 222 are an integral structure. Here, "integrated structure" means that the upper cover plate 221 and the blades 222 are formed integrally by injection molding. Of course, the upper cover plate 221 and the blades 222 can also be separately arranged, which will not be elaborated here; in this embodiment, the upper cover plate 221 and the blades 222 are formed integrally by injection molding. The lower cover plate 2121 is fixedly connected by the blade 222. Specifically, the lower cover plate 2121 has a groove corresponding to the blade 222. The blade 222 and the lower cover plate 2121 are fixedly connected by ultrasonic welding. Of course, the blade 222 and the lower cover plate 2121 can also be fixedly connected by other means. Through the above structure, the bushing 213 is fixed by injection molding, which helps to reduce the strength requirements of the bushing 213 and the connection between the bushing 213 and the rotor assembly, thereby reducing the material cost of the bushing 213 and the connection between the bushing 213 and the rotor assembly, and thus reducing the manufacturing cost of the rotor assembly.

[0038] See Figure 4 and Figure 5In this embodiment, the connection between the rotor 214 and the bushing 213 is the plastic portion of the first injection molded body 211, and the lower cover plate 2121 and the wrapping portion 2122 of the second injection molded body 212 are the plastic portions of the second injection molded body 212. The materials of the plastic portions of the first injection molded body 211 and the second injection molded body 212 can be the same or different. When the materials of the plastic portions of the first injection molded body 211 and the second injection molded body 212 are different, the second injection molded body 212 can be designed to have higher corrosion resistance than the first injection molded body 212. The corrosion resistance of the plastic part of the first injection molded body 211 is important because the plastic part of the second injection molded body 212 is in contact with the working medium. In addition, the plastic part of the second injection molded body 212 will be subjected to the force of the working medium when it is in contact with the working medium, and the plastic part of the second injection molded body 212 may be at risk of breaking. Therefore, when the materials of the plastic parts of the first injection molded body 211 and the second injection molded body 212 are different, the plastic part of the second injection molded body 212 can be designed to have higher toughness than the plastic part of the first injection molded body 211.

[0039] In this embodiment, participants Figure 4 and Figure 5 As shown, along the axial direction of the rotor assembly 21, the axial height of the bushing 213 is greater than the axial height of the rotor 214, the upper end face 2131a of the bushing 213 is higher than the upper end face of the rotor 214, and the lower end face 2131b of the bushing 213 is lower than the lower end face of the rotor 214; combined Figure 2 In this embodiment, the axial length of the bushing 213 is greater than or equal to half the axial length of the shaft 41. This is beneficial to relatively increasing the radial support area of ​​the shaft 41 on the bushing 213, thereby reducing the friction between the shaft 41 and the bushing 213.

[0040] See Figures 6 to 8 As shown, in this embodiment, the bushing 213 includes a body portion 2130 and at least one limiting portion 2131. The limiting portion 2131 protrudes from the outer peripheral surface of the body portion 2130 and extends along the axial direction of the bushing 213. The axial length of the limiting portion 2131 is less than the axial length of the body portion 2130. Specifically, the upper end face of the limiting portion 2131 is below the upper end face of the body portion 2130, and the lower end face of the limiting portion 2131 is above the lower end face of the body portion 2130. In this way, on the one hand, during the injection molding process, the first injection molding body 211 can form a connecting portion 215 at a location higher than the upper end face of the limiting portion 2131 and lower than the lower end face of the limiting portion 2131, thereby helping to prevent the bushing 213 from moving axially during the use of the rotor assembly 21. On the other hand, during the injection molding process, the first injection molding body 211 can form a connecting portion 215 at a location higher than the upper end face of the limiting portion 2131 and lower than the lower end face of the limiting portion 2131. The outer peripheral surface and side surface form a connection, which helps to prevent radial movement of the bushing 213 during use of the rotor assembly. See also Figure 7 In this embodiment, the bushing 213 includes three limiting parts 2131, which are evenly distributed along the circumference of the bushing 213. Of course, the limiting parts 2131 can also be non-uniformly distributed along the circumference of the bushing 213. In addition, the number of limiting parts 2131 can be two or other numbers.

[0041] As one implementation method, see Figures 6 to 10 As shown, the bushing 213 also includes a water passage groove 2132 and a hole 2133, the hole 2133 extending axially along the bushing 213. Figure 2 The shaft 41 extends into the cavity of the hole 2133 and is fitted with a clearance fit to the inner circumferential surface of the hole 2133. A water passage groove 2132 is recessed from the inner circumferential surface of the hole 2133 and extends along the axial direction of the hole 2133. Specifically, the water passage groove 2132 is spiral in shape. In this embodiment, along the axial direction of the hole 2133, the water passage groove 2132 penetrates the upper and lower end faces of the bushing 213. Figure 2 This allows some of the working medium to flow into and be stored in the cavity of the water tank 2132 when the electric pump is operating, which is beneficial for... Figure 2 The lubrication of shaft 3 further helps to reduce the friction between shaft 41 and bushing 213; specifically, see Figure 9 and Figure 10 In this embodiment, the bushing 213 includes a water passage groove 2132. Of course, in other embodiments, there may be multiple water passage grooves 2132. The water passage grooves 2132 may be evenly distributed along the circumference of the bushing 213.

[0042] See Figures 6 to 10As shown, the bushing 213 also includes a recess 2134, which is recessed inward from the upper end face 2131a of the bushing 213. The recess 2134 communicates with the water passage 2132. Along the axial direction of the bushing 213, the recess 2134 is located near the end of the water passage 2132. This recess 2134 facilitates the guidance of the working medium out of the water passage 2132. Specifically, the recess 2134 communicates with the water inlet of the rotating component 2. After the working medium enters from the water inlet of the rotating component 2, it flows out through the openings of the upper and lower cover plates. The fluid enters the cavity of the isolation sleeve 4, then flows into the water channel 2132 from the lower end face of the rotor assembly 21. After passing through the water channel 2132, it flows out from the recess 2134, achieving heat dissipation circulation. In this embodiment, the number of recesses 2134 differs from the number of water channels 2132. Specifically, the bushing 213 includes three recesses 2134, only one of which connects to one water channel 2132. Of course, in other embodiments, the number of recesses 2134 can correspond to the number of water channels 2132. It should be noted that the recesses 2134 can also be located on the lower end face 2131b of the bushing 213, allowing the working medium to be guided to the water channel 2132 through the recesses 2134 on the lower end face 2131b.

[0043] See Figures 6 to 10 As shown, the bushing 213 also includes a stepped surface 2131c, which is located below the upper end face 2131a of the bushing 213. The outer contour of the stepped surface 2131c is farther from the central axis of the bushing 213 than the outer contour of the upper end face 1312 of the bushing 213. By setting the stepped surface 2131c, the injection mold can use the stepped surface 2131c as a positioning reference surface during the injection molding process. In this way, the upper end face 2131a of the bushing 213 can extend into the cavity of the injection mold. Thus, during the injection molding process, the upper end face 2131a of the bushing 213 can be isolated from the injected plastic, which helps to prevent plastic from forming on the upper end face 2131a of the bushing 213 during the injection molding process. This also helps to prevent the plastic formed on the upper end face 2131a of the bushing 213 from falling off during the use of the electric pump, thereby helping to prevent contamination of the working medium.

[0044] As one implementation method, see Figure 10As shown, the water channel 2132 is spiral-shaped, and the coolant flows in the water channel 2132 in a roughly spiral shape. The pitch of the spiral is L, and the diameter is R. It can be understood that the heat dissipation efficiency of the water channel is related to the pitch L and diameter R of the spiral. At the same time, it is also necessary to ensure that the inner surface of the bushing 213 is in full contact with the shaft 41, so a reasonable pitch and diameter need to be designed. In this embodiment, the pitch L of the spiral is between 6mm and 8mm, and the diameter R is between 1mm and 2mm. Specifically, the pitch L is between 6.5mm and 7.5mm, and the diameter R is between 1.2mm and 1.8mm. In this way, by setting the pitch and diameter of the spiral, the cross-sectional area of ​​the water channel can meet the heat dissipation requirements, thereby improving the heat dissipation efficiency between the rotor assembly and the shaft, and thus improving the heat dissipation efficiency of the electric pump.

[0045] As one implementation method, the water channel 2132 is spiral-shaped, and the flow of coolant in the water channel 2132 is roughly in the shape of a spiral. The cross-sectional area of ​​the water channel 2132 is 1 square millimeter to 3 square millimeters, specifically 1.9 square millimeters to 2.5 square millimeters. In this way, the cross-sectional area of ​​the water channel meets the heat dissipation requirements, which helps to improve the heat dissipation efficiency between the rotor assembly and the shaft, and thus improves the heat dissipation efficiency of the electric pump.

[0046] As one implementation method, see Figure 9 and Figure 10 As shown, the rotation direction of the water passage 2132 is consistent with the rotation direction of the rotating assembly 2 during operation. Specifically, along the axial direction of the electric pump 100, the water passage 2132 includes a first end 2132a and a second end 2132b. The first end 2132a is closer to the upper end face 2131a of the bushing 213 than the second end 2132b. More specifically, the first end 2132a is closer to the inlet 223 than the second end 2132b. The water passage 2132 extends counterclockwise spirally from the first end 2132a towards the second end 2132b. Figure 3 and Figure 4 The impeller assembly has a plurality of blades 222, which are twisted counterclockwise. It can be understood that in this embodiment, the twisting direction of the blades 222 is counterclockwise. Of course, in other embodiments, the twisting direction of the blades 222 may also be set to clockwise. The rotation direction of the rotating component 2 during operation needs to correspond to the twisting direction of the blades 222. The rotation direction of the water channel 2132 is the same as the rotation direction of the rotating component 2 during operation, which can accelerate the flow of coolant in the water channel and thus improve the heat dissipation effect. In this way, it is beneficial to improve the heat dissipation efficiency of the electric pump.

[0047] The electric pump 100 includes a rotor assembly 21, which is an injection-molded part. The rotor assembly 21 includes a first injection-molded body 211 and a second injection-molded body. The first injection-molded body 211 includes a bushing 213 and a rotor 214. The first injection-molded body 211 is formed by injection molding at least with the rotor 214 and the bushing 213 as inserts. The first injection-molded body 211 includes a connecting portion 215 that connects the rotor 214 and the bushing 213. The first injection-molded body 211 is formed by injection molding at least with the first injection-molded body 211 as an insert. The second injection-molded body 212 includes a lower cover plate 2121 and a wrapping portion 2122, the wrapping portion 2122 wrapping at least a portion of the outer peripheral surface of the first injection-molded body 211. The rotating assembly 2 also includes blades 222. Along the axial direction of the rotating assembly 2, the lower cover plate 2121 is closer to the rotor 214 than the blades 222. The blades 222 are fixedly connected to the lower cover plate 2121, or the blades 222 and the lower cover plate 2121 are an integral structure. This arrangement helps to reduce the manufacturing cost of the rotor assembly.

[0048] Specifically, the rotor 214 includes a rotor core 2141 and a permanent magnet 2142. The rotor core 2141 includes a mounting portion, which is recessed from the outer periphery of the rotor core 2141 towards its central axis. The permanent magnet 2142 is partially located in the cavity of the mounting portion. The rotor core 2141 and the bushing 213 are fixed by injection molding, and the permanent magnet 2142 and the rotor core 2141 are fixed by injection molding. The wrapping portion 2122 of the second injection molded body 212 wraps the outer surface of the permanent magnet 2142 and forms a sealed structure that isolates the permanent magnet 2142 from the outside of the rotor assembly 21. This helps to form an isolation layer between the permanent magnet and the working medium, thereby preventing the permanent magnet from being corroded by the working medium and thus improving the service life of the rotor assembly.

[0049] The above examples illustrate the principles and implementation methods of this utility model. The descriptions of these embodiments are merely for the purpose of helping to understand the technical solution and core ideas of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. An electric pump (100), characterized in that: The assembly includes a rotating component (2) and a shaft (41). The rotating component (2) is rotatable about the shaft (41). The rotating component (2) includes a bushing (213). The bushing (213) includes a water channel (2132) and a hole (2133). The hole (2133) extends through the upper and lower end faces of the bushing (213) along its axial direction. Part of the shaft (41) is located in the hole (2133). The water passage groove (2132) is recessed from the wall surface corresponding to the hole (2133) and runs through the upper and lower end faces of the bushing (213) along the axial direction of the electric pump (100). The water passage groove (2132) is spiral in shape and the bushing (213) is made of plastic. The water passage groove (2132) and the bushing (213) are integrally injection molded.

2. The electric pump (100) according to claim 1, characterized in that, Along the axial direction of the electric pump (100), the bushing (213) has an upper end face (2131a) and a lower end face (2131b). Along the direction from the upper end face (2131a) to the lower end face (2131b), the rotation direction of the water passage (2132) is consistent with the rotation direction of the rotating assembly (2).

3. The electric pump (100) according to claim 1, characterized in that, The pitch of the spiral of the water passage (2132) is greater than or equal to 6 mm and less than or equal to 8 mm.

4. The electric pump (100) according to claim 2, characterized in that, The pitch of the spiral of the water passage (2132) is greater than or equal to 6 mm and less than or equal to 8 mm.

5. The electric pump (100) according to any one of claims 1 to 4, characterized in that, The cross-sectional area of ​​the water passage (2132) is greater than or equal to 1 square millimeter and less than or equal to 3 square millimeters.

6. The electric pump (100) according to any one of claims 1 to 4, characterized in that, The bushing (213) includes a recess (2134), which is recessed from the upper end face (2131a) of the bushing (213) and is connected to the water passage (2132).

7. The electric pump (100) according to claim 5, characterized in that, The bushing (213) includes a recess (2134), which is recessed from the upper end face (2131a) of the bushing (213) and is connected to the water passage (2132).

8. The electric pump (100) according to any one of claims 1 to 4, characterized in that, The rotating assembly (2) includes a rotor assembly (21), which is an injection molded part. The rotor assembly (21) includes a first injection molded body (211) and a second injection molded body. The first injection molded body (211) includes a bushing (213) and a rotor (214). The first injection molded body (211) is formed by injection molding with at least the rotor (214) and the bushing (213) as inserts. The first injection molded body (211) includes a connecting part (215) that connects the rotor (214) and the bushing (213). The first injection molded body (211) is formed by injection molding with at least the first injection molded body (211) as an insert. The second injection molded body (212) is formed, the second injection molded body (212) includes a lower cover plate (2121) and a wrapping part (2122), the wrapping part (2122) wraps at least a portion of the outer peripheral surface of the first injection molded body (211); the rotating assembly (2) also includes a blade (222), along the axial direction of the rotating assembly (2), the lower cover plate (2121) is closer to the rotor (214) than the blade (222), the blade (222) is fixedly connected to the lower cover plate (2121) or the blade (222) and the lower cover plate (2121) are an integral structure.

9. The electric pump (100) according to claim 5, characterized in that, The rotating assembly (2) includes a rotor assembly (21), which is an injection molded part. The rotor assembly (21) includes a first injection molded body (211) and a second injection molded body. The first injection molded body (211) includes a bushing (213) and a rotor (214). The first injection molded body (211) is formed by injection molding with at least the rotor (214) and the bushing (213) as inserts. The first injection molded body (211) includes a connecting part (215) that connects the rotor (214) and the bushing (213). The first injection molded body (211) is formed by injection molding with at least the first injection molded body (211) as an insert. The second injection molded body (212) is formed, the second injection molded body (212) includes a lower cover plate (2121) and a wrapping part (2122), the wrapping part (2122) wraps at least a portion of the outer peripheral surface of the first injection molded body (211); the rotating assembly (2) also includes a blade (222), along the axial direction of the rotating assembly (2), the lower cover plate (2121) is closer to the rotor (214) than the blade (222), the blade (222) is fixedly connected to the lower cover plate (2121) or the blade (222) and the lower cover plate (2121) are an integral structure.

10. The electric pump (100) according to claim 6, characterized in that, The rotating assembly (2) includes a rotor assembly (21), which is an injection molded part. The rotor assembly (21) includes a first injection molded body (211) and a second injection molded body. The first injection molded body (211) includes a bushing (213) and a rotor (214). The first injection molded body (211) is formed by injection molding with at least the rotor (214) and the bushing (213) as inserts. The first injection molded body (211) includes a connecting part (215) that connects the rotor (214) and the bushing (213). The first injection molded body (211) is formed by injection molding with at least the first injection molded body (211) as an insert. The second injection molded body (212) is formed, the second injection molded body (212) includes a lower cover plate (2121) and a wrapping part (2122), the wrapping part (2122) wraps at least a portion of the outer peripheral surface of the first injection molded body (211); the rotating assembly (2) also includes a blade (222), along the axial direction of the rotating assembly (2), the lower cover plate (2121) is closer to the rotor (214) than the blade (222), the blade (222) is fixedly connected to the lower cover plate (2121) or the blade (222) and the lower cover plate (2121) are an integral structure.

11. The electric pump (100) according to claim 7, characterized in that, The rotating assembly (2) includes a rotor assembly (21), which is an injection molded part. The rotor assembly (21) includes a first injection molded body (211) and a second injection molded body. The first injection molded body (211) includes a bushing (213) and a rotor (214). The first injection molded body (211) is formed by injection molding with at least the rotor (214) and the bushing (213) as inserts. The first injection molded body (211) includes a connecting part (215) that connects the rotor (214) and the bushing (213). The first injection molded body (211) is formed by injection molding with at least the first injection molded body (211) as an insert. The second injection molded body (212) is formed, the second injection molded body (212) includes a lower cover plate (2121) and a wrapping part (2122), the wrapping part (2122) wraps at least a portion of the outer peripheral surface of the first injection molded body (211); the rotating assembly (2) also includes a blade (222), along the axial direction of the rotating assembly (2), the lower cover plate (2121) is closer to the rotor (214) than the blade (222), the blade (222) is fixedly connected to the lower cover plate (2121) or the blade (222) and the lower cover plate (2121) are an integral structure.

12. The electric pump (100) according to claim 8, characterized in that, Along the axial direction of the rotor assembly (21), the axial length of the bushing (213) is greater than the axial length of the rotor (214), and the upper end face of the bushing (213) is higher than the upper end face of the rotor (214).

13. The electric pump (100) according to claim 9, characterized in that, Along the axial direction of the rotor assembly (21), the axial length of the bushing (213) is greater than the axial length of the rotor (214), and the upper end face of the bushing (213) is higher than the upper end face of the rotor (214).

14. The electric pump (100) according to claim 10, characterized in that, Along the axial direction of the rotor assembly (21), the axial length of the bushing (213) is greater than the axial length of the rotor (214), and the upper end face of the bushing (213) is higher than the upper end face of the rotor (214).

15. The electric pump (100) according to claim 11, characterized in that, Along the axial direction of the rotor assembly (21), the axial length of the bushing (213) is greater than the axial length of the rotor (214), and the upper end face of the bushing (213) is higher than the upper end face of the rotor (214).

16. The electric pump according to claim 8, characterized in that: The bushing (213) includes a body portion (2130) and at least one limiting portion (2131). The limiting portion (2131) is either protruding from the outer peripheral surface of the body portion (2130) or recessed from the outer peripheral surface of the body portion (2130). When the limiting portion (2131) protrudes from the outer peripheral surface of the body portion (2130), the length of the limiting portion (2131) is less than the length of the body portion (2130) along the axial extension direction of the rotor assembly (21). When the limiting portion (2131) is recessed from the outer peripheral surface of the body portion (2130), the limiting portion (2131) extends circumferentially along the body portion (2130).

17. The electric pump according to claim 12, characterized in that: The bushing (213) includes a body portion (2130) and at least one limiting portion (2131). The limiting portion (2131) is either protruding from the outer peripheral surface of the body portion (2130) or recessed from the outer peripheral surface of the body portion (2130). When the limiting portion (2131) protrudes from the outer peripheral surface of the body portion (2130), the length of the limiting portion (2131) is less than the length of the body portion (2130) along the axial extension direction of the rotor assembly (21). When the limiting portion (2131) is recessed from the outer peripheral surface of the body portion (2130), the limiting portion (2131) extends circumferentially along the body portion (2130).

18. The electric pump according to claim 8, characterized in that: The rotor (214) is annular, and the wrapping part (2122) of the second injection molded body (212) wraps the outer surface of the rotor (214) and forms a sealed structure that isolates the rotor (214) from the outside of the rotor assembly (21).

19. The electric pump according to claim 12, characterized in that: The rotor (214) is annular, and the wrapping part (2122) of the second injection molded body (212) wraps the outer surface of the rotor (214) and forms a sealed structure that isolates the rotor (214) from the outside of the rotor assembly (21).

20. The electric pump according to claim 14, characterized in that: The rotor (214) is annular, and the wrapping part (2122) of the second injection molded body (212) wraps the outer surface of the rotor (214) and forms a sealed structure that isolates the rotor (214) from the outside of the rotor assembly (21).

21. The electric pump according to any one of claims 18 to 20, characterized in that: The rotor (214) includes a rotor core (2141) and a permanent magnet (2142). The rotor core (2141) includes a mounting portion. The mounting portion is recessed from the outer periphery of the rotor core (2141) towards the central axis of the rotor core (2141). The permanent magnet (2142) is partially located in the cavity of the mounting portion. The rotor core (2141) is fixed to the bushing (213) by injection molding. The permanent magnet (2142) is fixed to the rotor core (2141) by injection molding. The wrapping portion (2122) of the second injection molded body (212) wraps the outer surface of the permanent magnet (2142) and forms a sealed structure that isolates the permanent magnet (2142) from the outside of the rotor assembly (21).

Images