Electric pump

Abstract

The utility model discloses an electric pump which comprises a stator, a motor cavity cover and a sound absorption piece, the motor cavity cover is provided with a motor cavity, the stator and the sound absorption piece are located in the motor cavity, the sound absorption piece is close to the motor cavity cover relative to the stator in the radial direction of the electric pump, the sound absorption piece at least covers part of the periphery of the stator, and the electric pump comprises a first limiting part and a matching part; one of the first limiting part and the matching part is arranged on the motor cavity cover, the other one of the first limiting part and the matching part is arranged on the sound absorption piece, and the first limiting part is matched with the matching part in a limiting mode. In this way, assembly and disassembly of the sound absorption part are facilitated.

Description

Technical Field

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

[0002] The electric pump includes a stator assembly, a motor cavity cover, and a sound-absorbing component. The sound-absorbing component is located between the stator assembly and the motor cavity cover and can appropriately reduce the noise of the water pump. Currently, there is no structure on the motor cavity cover that facilitates the installation and removal of the sound-absorbing component, which is not conducive to the installation and removal of the sound-absorbing component. Utility Model Content

[0003] The purpose of this application is to provide an electric pump that facilitates the installation and removal of sound-absorbing components.

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

[0005] An electric pump includes a stator, a motor cavity cover, and a sound-absorbing component. The motor cavity cover has a motor cavity. The stator and the sound-absorbing component are located in the motor cavity. Along the radial direction of the electric pump, the sound-absorbing component is close to the motor cavity cover relative to the stator. The sound-absorbing component covers at least a portion of the outer periphery of the stator. The electric pump includes a first limiting part and a mating part. One of the first limiting part and the mating part is disposed in the motor cavity cover, and the other of the first limiting part and the mating part is disposed in the sound-absorbing component. The first limiting part and the mating part are mutually limiting and mating.

[0006] The present application provides an electric pump, which includes a sound-absorbing component and a first limiting part. The first limiting part is matched with the sound-absorbing component for limiting. It can be understood that, compared with the solutions in the prior art, the present application's technical solution is more advantageous for the installation and removal of the sound-absorbing component in the electric pump. Attached Figure Description

[0007] Figure 1 This is a three-dimensional structural schematic diagram of one implementation 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 motor cavity cover;

[0010] Figure 4 yes Figure 3 A schematic diagram of the local structure at point I;

[0011] Figure 5 yes Figure 3 A schematic diagram of the local structure at point II;

[0012] Figure 6 yes Figure 3A three-dimensional cross-sectional view of the motor cavity cover;

[0013] Figure 7 yes Figure 3 A three-dimensional structural diagram of the sound-absorbing component;

[0014] Figure 8 This is a three-dimensional structural schematic diagram of another implementation of the motor cavity cover of the electric pump in this application;

[0015] Figure 9 yes Figure 8 A schematic diagram of the motor cavity cover from a top-down view;

[0016] Figure 10 yes Figure 8 A three-dimensional cross-sectional view of the motor cavity cover;

[0017] Figure 11 yes Figure 8 A three-dimensional structural diagram of the sound-absorbing component;

[0018] In the attached image:

[0019] 100. Electric pump;

[0020] 1. Pump cover; 11. Inlet section; 12. Outlet section; 13. Main body section;

[0021] 2. Rotating assembly; 21. Rotor assembly; 22. Impeller assembly;

[0022] 3. Stator assembly; 31. Stator; 32. Isolation sleeve; 33. Pump shaft;

[0023] 4. Control components; 41. Circuit board assembly; 42. Heat sink;

[0024] 5. Motor cavity cover; 501. Inner wall; 502. Bottom wall; 51. First limiting part; 511. First stop part; 5111. First stop surface; 512. Second stop part; 5121. Second stop surface; 513. Third stop part; 514. Fourth stop part; 515. Fifth stop part; 52. Second limiting part; 53. First opening part;

[0025] 6. Sound-absorbing component; 61. First end; 62. Second end; 63. Mating part; 631. First sub-mating part; 632. Second sub-mating part; 633. Third sub-mating part; 64. Outer surface; 65. Inner surface; 651. First sub-surface; 652. Second sub-surface;

[0026] 101. Pump inner cavity; 101a. First chamber; 101b. Second chamber; 102. Motor cavity; Detailed Implementation

[0027] The specific embodiments are described below with reference to the accompanying drawings:

[0028] 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.

[0029] See Figures 1 to 2 As shown, this application provides an electric pump 100, which includes a rotating assembly 2, a stator assembly 3, and a control assembly 4. The electric pump 100 has a pump cavity 101, which includes a first chamber 101a and a second chamber 101b, which 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. The stator assembly 3 includes a stator 31, an isolation sleeve 32, and a pump shaft 33. The rotating assembly 2 and at least a portion of the pump shaft 33 are located in the first chamber 101a, and at least a portion of the stator 31 and at least a portion of the control assembly 4 are located in the second chamber 101b. In this embodiment, the stator 31 and the control assembly 4 are located in the second chamber 101b. The stator 31 and the control assembly 4 do not contact the working medium, which helps to avoid short circuits. The pump shaft 33 is limited or fixedly connected to the isolation sleeve 32. The rotating assembly 2 is located on the outer periphery of the pump shaft 33. The stator 31 is electrically connected to the control assembly 4. When the electric pump 100 is working, the control assembly 4 controls the current in the stator 31, thereby controlling the excitation magnetic field generated by the stator 31. The rotating assembly 2 rotates under the action of the excitation magnetic field. Specifically, the rotating assembly 2 revolves around the pump shaft 33 under the action of the excitation magnetic field. Of course, as another implementation, the rotating assembly 2 and the pump shaft 33 are fixedly connected, and the pump shaft 33 rotates together with the rotating assembly 2.

[0030] Specifically, the rotating assembly 2 includes a rotor assembly 21 and an impeller assembly 22. A stator 31 is arranged around the rotor assembly 21 and cooperates with it. When the stator 31 is energized, it 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 the pump shaft 33. When the impeller assembly 22 rotates, it drives the flow of the surrounding fluid medium, which can be water or other media. Therefore, the impeller assembly 22 needs to be in contact with the fluid medium, while the stator 31 needs to be insulated from the fluid medium. Thus, the electric pump 100 in this embodiment includes a pump chamber 101, as shown below. Figure 2 As shown, the pump chamber 101 includes a first chamber 101a and a second chamber 101b that are isolated from each other. The pump chamber is divided into the first chamber 101a and the second chamber 101b by an isolation sleeve 32. At least a portion of the rotor assembly 21 and the impeller assembly 22 are disposed in the first chamber 101a, while the stator 31 is disposed in the second chamber 101b.

[0031] like Figure 2As shown, the electric pump 100 also includes a pump cover 1 and a motor cavity cover 5, which are sealed and fixed together. 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 it is operating. The motor cavity cover 5 is provided with a first opening 53, which is specifically located in... Figure 2 At the upper end of the motor cavity cover 5, the pump cover 1 is placed over the first opening 53, so the pump cover 1 and the motor cavity cover 5 can be closed to form the pump cavity 101. The electric pump 100 also includes an isolation sleeve 32, which is disposed in the motor cavity cover 5. The isolation sleeve 32 has an open end facing the pump cover 1. The isolation sleeve 32 divides the pump cavity into a first chamber 101a and a second chamber 101b. The inner cavity of the isolation sleeve 32 can form at least a part of the first chamber 101a. In this embodiment, the first chamber 101a includes the inner cavity of the pump cover 1 and the inner cavity of the isolation sleeve 32.

[0032] It is understood that in this embodiment, the rotating component 2, stator 31, and pump shaft 33 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 first opening 53 at one end of the axial direction. The pump cover 1 is axially mounted on the first opening 53. The pump 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 pump cover 1. The outlet 12 is also a tubular structure, and the outlet 12 is approximately perpendicular to the inlet 11. Figure 2 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 pump 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.

[0033] The electric pump 100 also includes a sound-absorbing component 6, which is located between the motor cavity cover 5 and the stator 31. Specifically, there is a gap between the stator assembly 3 and the motor cavity cover 5, and the sound-absorbing component 6 is located in the gap between the stator assembly 3 and the motor cavity cover 5. In this way, the noise of the electric pump can be appropriately reduced.

[0034] The inventors discovered that the lack of a limiting structure on the motor cavity cover to facilitate the installation and removal of the sound-absorbing components makes it difficult to install, remove, and fix the sound-absorbing components. By setting a limiting structure on the motor cavity cover, the sound-absorbing components can be detachably fixed between the stator assembly and the motor cavity cover, thereby improving the ease of installation and stability of the sound-absorbing part, and thus improving the vibration reduction and noise reduction effect of the electric pump.

[0035] As one implementation method, see Figures 1 to 11 As shown, an electric pump 100 includes a stator 31, a motor cavity cover 5, and a sound-absorbing component 6. The motor cavity cover 5 has a motor cavity 102. The stator and the sound-absorbing component 6 are located in the motor cavity 102. Along the radial direction of the electric pump 100, the sound-absorbing component 6 is close to the motor cavity cover 5 relative to the stator 31. The sound-absorbing component 6 at least covers a portion of the outer periphery of the stator 31. Specifically, the stator 31 is located in the motor cavity 102 of the motor cavity cover 5. The stator 31 is fixedly connected to the motor cavity cover 5, which helps to prevent the stator 31 from loosening. In this embodiment, the motor cavity cover 5 has a second limiting part 52. The second limiting part 52 is interference-fitted with the outer wall 301 of the stator 31, so that the stator 31 is fixed in the inner cavity of the motor cavity cover 5. More specifically, there is a gap between the stator 31 and the motor cavity cover 5. It is understandable that the gap is beneficial for the assembly of the stator 31 and for reducing the weight of the electric pump, but it will lead to wasted space and higher noise. The sound-absorbing component 6 is located in the gap between the stator 31 and the motor cavity cover 5. It is understandable that the sound-absorbing component 6, made of sound-absorbing material, fills the gap between the stator 31 and the motor cavity cover 5. This not only makes the structure of the electric pump more compact and is conducive to the stability of the overall structure of the electric pump, but also absorbs the noise of the internal space, achieving the effect of vibration reduction and noise reduction, thereby helping to reduce the noise of the electric pump.

[0036] The electric pump 100 includes a first limiting part 51 and a mating part 63. One of the first limiting part 51 and the mating part 63 is disposed in the motor cavity cover 5, and the other of the first limiting part 51 and the mating part 63 is disposed in the sound-absorbing member 6. The first limiting part 51 and the mating part 63 are mutually limiting and mating. Specifically, as shown... Figure 3 and Figure 4 As shown, in this embodiment, the first limiting part 51 is L-shaped in a top view. The first limiting part 51 and the inner wall of the motor cavity cover 5 together form the mounting cavity of the sound-absorbing component 6, allowing the sound-absorbing component 6 to be detachably installed in the gap between the stator assembly 3 and the motor cavity cover 5. The first limiting part 51 and the mating part 63 of the sound-absorbing component 6 are connected in a limiting manner. It can be understood that the limiting cooperation between the first limiting part 51 and the mating part 63 fixes the sound-absorbing component 6 between the stator assembly 3 and the motor cavity cover 5, thereby enabling the sound-absorbing component 6 to achieve a sound absorption effect within the enclosed space of the electric pump 100, thereby reducing the vibration and noise of the entire pump. In this way, it is beneficial to install and limit the sound-absorbing component, thereby helping to reduce the vibration and noise of the electric pump.

[0037] Further, see Figures 1 to 11 As shown, a first limiting part 51 is formed on the motor cavity cover 5. The first limiting part 51 protrudes from the wall surface corresponding to the motor cavity 102 and extends along the axial direction of the electric pump 100. A mating part 63 is formed on the sound-absorbing member 6. It can be understood that the first limiting part 51 and the motor cavity cover 5 are an integral part. The mating part 63 on the sound-absorbing member 6 and the first limiting part 51 on the motor cavity cover 5 limit and cooperate to achieve the assembly of the sound-absorbing member 6. In this way, it is beneficial to install and limit the sound-absorbing member, thereby helping to reduce the vibration and noise of the electric pump. Of course, in other implementations, the first limiting part 51 can also be formed on the sound-absorbing member 6, and the mating part 63 can also be formed on the motor cavity cover 5.

[0038] Specifically, such as Figures 2 to 4 As shown, the motor cavity cover 5 includes an inner wall 501. Along the radial direction of the electric pump 100, a first limiting portion 51 protrudes radially inward from the inner wall 501 of the motor cavity cover 5. Specifically, the first limiting portion 51 and the motor cavity cover 5 are integrally formed; more specifically, the first limiting portion 51 and the motor cavity cover 5 are integrally injection molded. It can be understood that along the axial direction of the electric pump 100, the length of the first limiting portion 51 is less than the length of the inner wall 501 of the motor cavity cover 5. Along the radial direction of the electric pump 100, the first limiting portion 51 protrudes radially inward from the inner wall 501. The stator assembly 3 has an outer wall (not shown in the figure), and the first limiting portion 51 is located on the outer periphery of the outer wall. It should be noted that the axial direction of the electric pump 100 here and below refers to the height direction of the electric pump 100. See [reference needed]. Figure 2 As shown, the height direction of the electric pump 100 is in the direction of arrow "H", and the radial direction of the electric pump 100 is along the direction perpendicular to the axial direction of the electric pump 100. Here, "radial inner side" refers to the direction along the radial direction of the electric pump and close to the axis of the electric pump 100. This method is beneficial for the installation and positioning of the sound-absorbing component.

[0039] In another implementation, the motor cavity cover 5 includes a bottom wall 502. Along the axial direction of the electric pump 100, a first limiting portion 51 protrudes from the bottom wall 502 in an axially inward direction. Specifically, the first limiting portion 51 and the motor cavity cover 5 are integrally formed; more specifically, the first limiting portion 51 and the motor cavity cover 5 are integrally injection molded. It can be understood that along the radial direction of the electric pump 100, the first limiting portion 51 is located radially inward on the inner wall 501, and along the axial direction of the electric pump 100, the bottom wall 502 of the first limiting portion 51 protrudes axially inward. The sound-absorbing member 6 is located between the first limiting portion 51 and the inner wall 501. The stator assembly 3 includes an outer wall, and the first limiting portion 51 is located on the outer periphery of the outer wall. Specifically, the first limiting portion 51 and the sound-absorbing member 6 are located on the outer periphery of the outer wall, and the sound-absorbing member 6 abuts against the outer wall; more specifically, the first limiting portion 51 abuts against the outer wall. This arrangement facilitates the installation and positioning of the sound-absorbing member.

[0040] As one implementation method, such as Figures 2 to 7 As shown, the first limiting part 51 includes a first stop part 511 and a second stop part 512. Specifically, the first stop part 511 protrudes from the inner wall 501 of the motor cavity cover 5 along the radial inner side of the electric pump 100. Along the circumferential direction of the electric pump 100, the sound-absorbing member 6 is located between the first stop part 511 and the second stop part 512. The sound-absorbing member 6 includes a first end 61 and a second end 62, which are located at both ends in the circumferential direction of the sound-absorbing member 6. The mating part 63 includes a first sub-matting part 631 and a second sub-matting part 632. The first sub-matting part 631 is located at the first end 61, and the second sub-matting part 632 is located at the second end 62. Along the circumferential direction of the electric pump 100, the first sub-matting part 631 is limited to the first stop part 511, and the second sub-matting part 632 is limited to the second stop part 512. Specifically, along the radial direction of the electric pump 100, the lengths of the first stop 511 and the second stop 512 are greater than the length of the sound-absorbing member 6. This facilitates the limiting of the sound-absorbing member 6 by the first stop 511 and the second stop 512, and also facilitates the formation of the third stop 513 and the fourth stop 514 on the first stop 511 and the second stop 512. It can be understood that the first stop 511 restricts the sound-absorbing member 6 in the axial direction of the electric pump 100. In this way, it is beneficial to limit the sound-absorbing member in the circumferential direction of the electric pump.

[0041] Furthermore, as a means of implementation, such as Figures 2 to 7As shown, the first limiting part 51 includes a third stop part 513 and a fourth stop part 514. The first stop part 511 includes a first stop surface 5111, and a first sub-fitting part 631 is formed on the first stop surface 5111. One end of the first stop part 511 is integrally formed with the wall portion corresponding to the motor cavity 102. The third stop part 513 is disposed at the other end of the first stop part 511 and protrudes from the first stop surface 5111 in a direction away from the first stop surface 5111. The second stop part 512 includes a second stop surface 5121, and a second sub-fitting part 632 is formed on the second stop surface 5121. One end of the second stop part 512 is integrally formed with the wall portion corresponding to the motor cavity 102. The fourth stop part 514... 4 is disposed at the other end of the second stop 512, and the fourth stop 514 protrudes from the second stop surface 5121. The sound-absorbing member 6 includes an outer surface 64 and an inner surface 65. Along the radial direction of the electric pump 100, the outer surface 64 is close to the motor cavity cover 5 relative to the inner surface 65, defining a first sub-surface 651 and a second sub-surface 652. Both the first sub-surface 651 and the second sub-surface 652 are formed on the inner surface 65. The first sub-surface 651 is connected to the surface corresponding to the first end 61, and the second sub-surface 652 is connected to the surface corresponding to the second end 62. Along the direction of the electric pump 100, the first sub-surface 651 is limited to the third stop 513, and the second sub-surface 652 is limited to the fourth stop 514.

[0042] Specifically, along the radial direction of the electric pump 100, the outer surface 64 of the sound-absorbing component 6 is fitted with the inner wall 501 of the motor cavity cover 5, and the inner surface 65 of the sound-absorbing component 6 is fitted with the third stop 513 and the fourth stop 514. It can be understood that the third stop 513 and the first stop 511 are integral parts, and the fourth stop 514 and the second stop 512 are integral parts. Along the radial direction of the electric pump 100, the third stop 513 and the fourth stop 514 provide a limiting function for the sound-absorbing component 6. Of course, in other embodiments, the third stop 513 and the first stop 511, and the fourth stop 514 and the second stop 512, can also be separately provided. This method facilitates the limiting of the sound-absorbing component in the radial direction of the electric pump.

[0043] Furthermore, as a means of implementation, such as Figures 2 to 7 As shown, the first limiting part 51 also includes a fifth stop part 515. The wall corresponding to the motor cavity 102 includes a bottom wall 502. The fifth stop part 515 protrudes from the bottom wall 502. The fifth stop part 515 connects the first stop part 511 and the second stop part 512. Along the radial direction of the electric pump 100, the sound-absorbing member 6 is close to the motor cavity cover 5 relative to the fifth stop part 515.

[0044] Specifically, along the axial direction of the electric pump 100, the fifth stop 515 protrudes from the bottom wall 502 toward the pump cover 1. In this embodiment, as shown... Figure 6As shown, the fifth stop 151 connects the first stop 511 and the second stop 512 in a U-shape. Along the circumferential direction of the electric pump 100, the fifth stop 515 abuts against the third stop 513 and the fourth stop 514. Specifically, the fifth stop 515 is integrally formed with the first stop 511, the second stop 512, the third stop 513 and the fourth stop 514. It should be noted that in other embodiments, the fifth stop 515 can also be separately provided with the first stop 511 and / or the second stop 512 and / or the third stop 513 and / or the fourth stop 514. Along the radial direction of the electric pump 100, the fifth stop 515 is close to the stator 31 relative to the sound-absorbing member 6. The fifth stop 515 and the sound-absorbing member 6 are in a limiting cooperation. It can be understood that, along the radial direction of the electric pump 100, the fifth stop 515 provides a limiting function for the sound-absorbing member 6, and the fifth stop 515 limits the end of the sound-absorbing member 6 near the bottom surface 502. In this way, it is beneficial to limit the sound-absorbing member in the radial direction of the electric pump.

[0045] As another implementation method, see Figures 8 to 11 As shown, the first limiting part 51' includes a first stop 511' and a second stop 512'. The first stop 511' and the second stop 512' are spaced apart along the circumferential direction of the electric pump 100. The mating part 63' has a hole-like structure. Of course, in other implementations, the mating part 63' can also have other shapes. The mating part 63' includes a first sub-matting part 631' and a second sub-matting part 632'. Both the first sub-matting part 631' and the second sub-matting part 632' extend along a direction parallel to the axis of the electric pump 100. At least a portion of the first stop 511' is located in the first sub-matting part 631', and at least a portion of the second stop 512' is located in the second sub-matting part 632'. It can be understood that the first limiting part 51' provides constraint on the sound-absorbing member 6 along the radial and circumferential directions of the electric pump 100 through the mating part 63'. In this way, it is beneficial to improve the ease of installation of the sound-absorbing member.

[0046] Further, see Figures 8 to 11 As shown, the first limiting part 51' includes a plurality of third stop parts 513', and the mating part 63' includes a plurality of third sub-matting parts 633'. Along the circumferential direction of the electric pump 100, the third stop parts 513' are located between the first stop parts 511' and the second stop parts 512, and the third sub-matting parts 633' are located between the first sub-matting parts 631' and the second sub-matting parts 632'. The number of third stop parts 513' matches the number of third sub-matting parts 633', and at least some of the third stop parts 513' are located in the third sub-matting parts 633'. Specifically, as shown... Figure 9 and Figure 11As shown, in this embodiment, the first limiting part 51' includes a third stop 513', and the mating part 63' includes a third sub-matting part 633'. The third stop 513' and the third sub-matting part 633' engage in a limiting fit. Of course, in other implementations, the number of third stop 513' and third sub-matting parts 633' can also be different. It can be understood that the third stop 513' and the third sub-matting part 633' can increase the limiting part's constraint capability on the sound-absorbing component and reduce the risk of insufficient constraint between the first stop and the second stop due to excessive distance between them in the circumferential direction of the electric pump. This approach facilitates the installation and limiting of the sound-absorbing component.

[0047] As one implementation method, such as Figures 2 to 11 As shown, the sound-absorbing component 6 includes multiple components, and the number of first limiting parts 51 matches the number of sound-absorbing components 6. Specifically, in this embodiment, there are three sound-absorbing components 6, and correspondingly, there are also three first limiting parts 51. This method facilitates the installation and positioning of the sound-absorbing components.

[0048] As one implementation method, such as Figures 3 to 11 As shown, the electric pump 100 also includes a plurality of second limiting parts 52. The second limiting parts 52 protrude from the wall surface corresponding to the motor cavity 102. The second limiting parts 52 are limited or fixedly connected to the stator assembly 3. Specifically, along the radial direction of the electric pump 100, the second limiting parts 52 protrude from the inner wall 501 of the motor cavity cover 5 toward the stator 31. The second limiting parts 52 are interference-fitted with the outer wall of the stator 31. It can be understood that the second limiting parts 52 fix the stator 31 in the inner cavity of the motor cavity cover 5. The second limiting parts 52 and the motor cavity cover 5 are an integral part.

[0049] Furthermore, the second limiting portions 52 are evenly distributed on the outer periphery of the stator 31. In this embodiment, for example... Figure 3 As shown, the second limiting part 52 includes three second limiting parts 52, which are evenly distributed on the outer periphery of the outer wall. This facilitates the constraint of the second limiting parts 52 on the stator 31. It should be noted that, due to the interference fit between the second limiting parts 52 and the outer wall of the stator 31, the gap between the motor cavity cover 5 and the stator 31 is separated by the second limiting parts 52, such as... Figure 3 As shown, in this embodiment, the three second limiting parts 52 divide the gap between the motor cavity cover 5 and the stator 31 into three parts. It can be understood that, along the circumferential direction of the electric pump 100, the first limiting part 51 is distributed between two adjacent second limiting parts 52. In this way, it is beneficial to install and fix the stator assembly.

[0050] Furthermore, such as Figure 5As shown, the second limiting part 52 and the first limiting part 51 are separate structures. Along the circumferential direction of the electric pump 100, there is a gap between adjacent first limiting parts 51 and second limiting parts 52. It can be understood that the sound-absorbing element 6 is disposed in the gap between adjacent first limiting parts 51, but not in the gap between adjacent first limiting parts 51 and second limiting parts 52. Of course, in other implementations, the first limiting part 51 and the second limiting part 52 can also be an integral structure, and there is no gap between adjacent first limiting parts 51 and second limiting parts 52. This arrangement facilitates the formation of the first and second limiting parts.

[0051] As one implementation method, see Figures 3 to 10 As shown, a second limiting part 52 is provided between the two first limiting parts 51 along the circumferential direction of the electric pump 100. The motor cavity 102 includes a bottom wall 502. Both the first limiting parts 51 and the second limiting parts 52 extend along a direction parallel to the axis of the electric pump 100. The extension length of the first limiting part 51 from the bottom wall 502 is greater than or equal to the extension length of the second limiting part 52 from the bottom wall 502. Specifically, the extension length of the first limiting part 51 from the bottom wall 502 is greater than the extension length of the second limiting part 52 from the bottom wall 502. It can be understood that having the extension length of the first limiting part 51 from the bottom wall 502 greater than or equal to the extension length of the second limiting part 52 from the bottom wall 502 facilitates the installation of the sound-absorbing component along the axial direction of the electric pump. This method facilitates the installation of the sound-absorbing component.

[0052] As one implementation method, the thickness of the sound-absorbing component 6 is greater than 1mm along the radial direction of the electric pump 100. This method helps to ensure the sound absorption and vibration reduction effect of the sound-absorbing component 6.

[0053] The isolation sleeve 32 includes an end portion 321 and an opening portion 322. Along the axial direction of the electric pump 100, the end portion 321 is farther away from the pump cover 1 relative to the opening portion 322. Specifically, as shown... Figure 8 As shown, the opening 322 is located at the top of the isolation sleeve 32, and the end portion 321 is located at the bottom of the isolation sleeve 32. The opening 322 is sealed to the pump cover 1. Specifically, a sealing structure is provided between the opening 322 and the pump cover 1. The isolation sleeve 32 and the pump cover 1 are sealed through this sealing structure to achieve the sealing of the electric pump 100. More specifically, a sealing ring is provided between the opening 322 and the pump cover 1. It can be understood that the first chamber 101a is composed of the inner cavity of the pump cover 1 and the inner cavity of the isolation sleeve 32. When the electric pump is working, the working medium flows through the first chamber 101a. The sealing ring prevents the working medium from leaking from the first chamber 101a to the outside of the electric pump 100. The opening 322 is fixedly connected or limited to the pump cover 5. Specifically, in this embodiment, as shown... Figure 2As shown, the opening 322 is connected to the pump cover 1 for a limiting connection. The first opening 53 of the pump cover 1 is provided with a protruding limiting structure, and the opening 322 of the isolation sleeve 32 is provided with a recessed limiting structure corresponding to the limiting structure in the first opening 53. It can be understood that the isolation sleeve divides the pump chamber into a first chamber and a second chamber, and prevents the working medium from leaking from the first chamber.

[0054] The isolation sleeve 32 is made of metal and is formed by stamping and stretching a metal sheet. The thickness of the isolation sleeve is 0.4mm-1mm. For example, the thickness of the isolation sleeve 32 can be 0.5mm, 0.6mm, or 0.8mm. This ensures the strength of the isolation sleeve 32 while the thinner sidewall is more conducive to heat conduction between the working medium, the sidewall of the isolation sleeve 32, and the stator assembly 3, thereby facilitating heat dissipation of the stator assembly 3. On the other hand, if the thickness of the isolation sleeve 32 is too thick, it will increase the electromagnetic eddy currents during the use of the electric pump, thus affecting the performance of the motor.

[0055] like Figure 2 As shown, the control component 4 includes a circuit board assembly 41 and a heat sink 42. One end of the heat sink 42 abuts against the circuit board assembly 41, and the other end of the heat sink 42 abuts against the bottom of the isolation sleeve 32. It can be understood that the heat sink 42 is located between the circuit board assembly 41 and the isolation sleeve 32. The heat sink 42 conducts the heat of the circuit board assembly 41 to the isolation sleeve 32, and then the isolation sleeve 32 transfers the heat away to enhance the heat dissipation capacity of the electric pump 100.

[0056] The above examples illustrate the principle and implementation of this utility model. The descriptions of the embodiments are merely for the purpose of helping to understand the method and core idea 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 electric pump (100) includes a stator (31), a motor cavity cover (5), and a sound-absorbing component (6). The motor cavity cover (5) has a motor cavity (102). The stator (31) and the sound-absorbing component (6) are located in the motor cavity (102) along the radial direction of the electric pump (100). The sound-absorbing component (6) is close to the motor cavity cover (5) relative to the stator (31). The sound-absorbing component (6) covers at least part of the outer periphery of the stator (31). The electric pump (100) includes a first limiting part (51) and a mating part (63). One of the first limiting part (51) and the mating part (63) is disposed in the motor cavity cover (5), and the other of the first limiting part (51) and the mating part (63) is disposed in the sound-absorbing component (6). The first limiting part (51) and the mating part (63) are mutually limiting and mating.

2. The electric pump (100) according to claim 1, characterized in that, The first limiting part (51) is formed on the motor cavity cover (5). The first limiting part (51) protrudes from the wall surface corresponding to the motor cavity (102). The first limiting part (51) extends along the axial direction of the electric pump (100). The mating part (63) is formed on the sound-absorbing member (6).

3. The electric pump (100) according to claim 2, characterized in that, The first limiting part (51) includes a first stop (511) and a second stop (512). Along the circumferential direction of the electric pump (100), the sound-absorbing member (6) is located between the first stop (511) and the second stop (512). The sound-absorbing member (6) includes a first end (61) and a second end (62). The first end (61) and the second end (62) are disposed at both ends of the sound-absorbing member (6) in the circumferential direction. The mating part (63) includes a first sub-matting part (631) and a second sub-matting part (632). The first sub-matting part (631) is located at the first end (61), and the second sub-matting part (632) is located at the second end (62). Along the circumferential direction of the electric pump (100), the first sub-matting part (631) is limited to the first stop (511), and the second sub-matting part (632) is limited to the second stop (512).

4. The electric pump (100) according to claim 3, characterized in that, The first limiting part (51) includes a third stop (513) and a fourth stop (514). The first stop (511) includes a first stop surface (5111), and a first sub-fitting part (631) is formed on the first stop surface (5111). One end of the first stop (511) is integrally formed with the wall corresponding to the motor cavity (102). The third stop (513) is disposed at the other end of the first stop (511), and the third stop (513) protrudes from the first stop surface (5111) in a direction away from the first stop surface (5111). The second stop (512) includes a second stop surface (5121), and a second sub-fitting part (632) is formed on the second stop surface (5121). One end of the second stop (512) is integrally formed with the wall corresponding to the motor cavity (102). The fourth stop (514) is disposed at the other end of the first stop surface (5121). At the other end of the stop (512), the fourth stop (514) protrudes from the second stop surface (5121). The sound-absorbing member (6) includes an outer surface (64) and an inner surface (65). Along the radial direction of the electric pump (100), the outer surface (64) is close to the motor cavity cover (5) relative to the inner surface (65), defining a first sub-surface (651) and a second sub-surface (652). The first sub-surface (651) and the second sub-surface (652) are both formed on the inner surface (65). The first sub-surface (651) is connected to the surface corresponding to the first end (61), and the second sub-surface (652) is connected to the surface corresponding to the second end (62). Along the direction of the electric pump (100), the first sub-surface (651) is in a limiting fit with the third stop (513), and the second sub-surface (652) is in a limiting fit with the fourth stop (514).

5. The electric pump (100) according to claim 4, characterized in that, The first limiting part (51) includes a fifth stop (515), the wall corresponding to the motor cavity (102) includes a bottom wall (502), the fifth stop (515) protrudes from the bottom wall (502), the fifth stop (515) connects the first stop (511) and the second stop (512), and along the radial direction of the electric pump (100), the sound-absorbing member (6) is close to the motor cavity cover (5) relative to the fifth stop (515).

6. The electric pump (100) according to claim 2, characterized in that, The first limiting part (51) includes a first stop (511) and a second stop (512). The first stop (511) and the second stop (512) are spaced apart along the circumferential direction of the electric pump (100). The mating part (63) has a hole-like structure. The mating part (63) includes a first sub-matting part (631) and a second sub-matting part (632). The first sub-matting part (631) and the second sub-matting part (632) both extend along a direction parallel to the axis of the electric pump (100). At least a portion of the first stop (511) is located in the first sub-matting part (631), and at least a portion of the second stop (512) is located in the second sub-matting part (632).

7. The electric pump (100) according to claim 6, characterized in that, The first limiting part (51) includes a plurality of third stop parts (513), and the mating part (63) includes a plurality of third sub-matting parts (633). Along the circumferential direction of the electric pump (100), the third stop parts (513) are located between the first stop parts (511) and the second stop parts (512), and the third sub-matting parts (633) are located between the first sub-matting parts (631) and the second sub-matting parts (632). The number of third stop parts (513) matches the number of third sub-matting parts (633), and at least a portion of the third stop parts (513) are located in the third sub-matting parts (633).

8. The electric pump (100) according to any one of claims 2 to 7, characterized in that, The sound-absorbing component (6) includes multiple components, and the number of the first limiting part (51) matches the number of the sound-absorbing component (6).

9. The electric pump (100) according to claim 8, characterized in that, The electric pump (100) includes a plurality of second limiting parts (52), which protrude from the wall surface corresponding to the motor cavity (102). The second limiting parts (52) are limited or fixedly connected to the stator (31). The second limiting parts (52) are provided between the two first limiting parts (51) along the circumferential direction of the electric pump (100). The motor cavity (102) includes a bottom wall (502). The first limiting parts (51) and the second limiting parts (52) both extend along a direction parallel to the axis of the electric pump (100). The extension length of the first limiting part (51) from the bottom wall (502) is greater than or equal to the extension length of the second limiting part (52) from the bottom wall (502).

10. The electric pump (100) according to any one of claims 1 to 9, characterized in that, Along the radial direction of the electric pump (100), the thickness of the sound-absorbing element (6) is greater than 1 mm.

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