Electric pump

Abstract

The utility model discloses an electric pump which comprises a pump cover, a stator assembly and a pump shell, the electric pump is provided with a pump inner cavity, the stator assembly is located in the pump inner cavity and comprises a stator winding and an isolation sleeve, the isolation sleeve is located in the pump inner cavity, the pump inner cavity comprises a first cavity and a second cavity, the isolation sleeve isolates the first cavity and the second cavity, and the first cavity and the second cavity are not communicated. The stator winding is located in the second cavity and comprises a stator iron core, the electric pump comprises a restraining part, the restraining part is fixedly connected with the stator iron core, the restraining part is located at the end of the stator iron core in the axial direction of the electric pump, the stator iron core is arranged on the periphery of the isolation sleeve in a sleeving mode in the radial direction of the electric pump, and the restraining part is in interference fit with the isolation sleeve. By means of the mode, constraint on the isolation sleeve can be increased, and therefore vibration and noise of the electric pump can be reduced.

Description

Technical Field

[0001] This application relates to the field of thermal management technology, and more particularly to an electric pump for automotive, energy storage, or commercial use. Background Technology

[0002] The electric pump includes a stator winding and an isolation sleeve. The stator winding includes a stator core. The isolation sleeve is interference-fitted with the stator core. Currently, because the axial length of the isolation sleeve is greater than the length of the stator core, the stator does not sufficiently constrain the isolation sleeve. This leads to increased vibration of the isolation sleeve during pump operation, resulting in increased vibration and noise of the electric pump. Utility Model Content

[0003] The purpose of this application is to provide an electric pump that facilitates increased constraint on the isolation sleeve, thereby helping to reduce vibration and 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 pump cover, a stator assembly, and a pump housing. The electric pump has an inner cavity, and the stator assembly is located within the inner cavity. The stator assembly includes a stator winding and an isolation sleeve. The isolation sleeve is located within the inner cavity, which includes a first cavity and a second cavity. The isolation sleeve isolates the first cavity and the second cavity, and the first cavity and the second cavity are not in communication. The stator winding is located within the second cavity and includes a stator core. The electric pump includes a constraint part, which is fixedly connected to the stator core. Along the axial direction of the electric pump, the constraint part is disposed at the end of the stator core. Along the radial direction of the electric pump, the stator core is sleeved on the outer periphery of the isolation sleeve, and the constraint part and the isolation sleeve are interference-fitted.

[0006] The electric pump provided by this application includes a stator core, an isolation sleeve, and a constraint part. The stator core and the constraint part are fixedly connected. Along the axial direction of the electric pump, the constraint part is located at the end of the stator core. Along the radial direction of the electric pump, the constraint part is located on the outer periphery of the isolation sleeve. The constraint part and the isolation sleeve are interference-fitted. It can be understood that, compared with the prior art, in this technical solution, the constraint part is set at the axial end of the stator core and is interference-fitted with the isolation sleeve, which increases the length of the constrained section of the isolation sleeve in the axial direction. This is beneficial to increase the constraint on the isolation sleeve, thereby reducing the vibration of the isolation sleeve, and thus reducing the vibration and 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 electric pump after removing the pump cover;

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

[0011] Figure 5 yes Figure 1 A three-dimensional structural diagram of the isolation sleeve in a medium-sized electric pump;

[0012] Figure 6 yes Figure 1 A three-dimensional structural diagram of the middle stator assembly;

[0013] Figure 7 yes Figure 1 A three-dimensional structural diagram of the middle stator assembly from another perspective;

[0014] Figure 8 yes Figure 5 A three-dimensional cross-sectional view of the middle stator assembly;

[0015] Figure 9 yes Figure 7 A three-dimensional structural diagram of the middle stator winding;

[0016] Figure 10 yes Figure 9 A three-dimensional structural diagram of the central insulating frame;

[0017] Figure 11 yes Figure 10 A three-dimensional structural diagram of the second insulating frame;

[0018] Figure 12 yes Figure 10 A magnified view of a section at point A in the middle;

[0019] Figure 13 yes Figure 10 A top view of the insulating frame structure;

[0020] Figure 14 yes Figure 13 A magnified view of a section at point B in the middle;

[0021] Figure 15 yes Figure 10 A front view schematic diagram of the insulating frame;

[0022] Figure 16 This is a three-dimensional structural diagram of the second insulating frame in another embodiment of the electric pump of this application;

[0023] Figure 17 This is a schematic diagram of the formal structure of the second insulating frame in another embodiment of the electric pump of this application;

[0024] In the attached image:

[0025] 100. Electric pump;

[0026] 1. Pump cover; 11. Inlet section; 12. Outlet section; 13. Main body section;

[0027] 2. Rotating assembly; 21. Rotor assembly; 22. Impeller assembly;

[0028] 3. Stator assembly;

[0029] 31. Stator winding;

[0030] 311. Stator core; 3111. First end; 3112. Second end; 312. Winding; 313. Insulating frame; 314. First insulating frame;

[0031] 315. Second insulating frame; 3151. Second main body; 3152. Second winding part; 3153. Second stop part; 3154. Connecting and limiting part; 3154a. Insert pin; 3154b. Positioning post;

[0032] 316. Constraint part; 3161. Sub-constraint part; 3161a. Inner end part; 3161b. Outer end part; 3161c. Head part; 3161d. Tail part; 3161e. Recess; 3161f. Groove; 3162. First sub-part; 3163. Second sub-part; 317. First constraint part; 318. Second constraint part; 319. Sub-framework;

[0033] 32. Isolation sleeve; 321. End; 322. Open end; 323. Cylindrical part;

[0034] 33. Pump shaft;

[0035] 4. Control components;

[0036] 5. Pump casing; 51. Limiting component; 52. First open end;

[0037] 101, Pump inner cavity; 101a, First cavity; 101b, Second cavity. Detailed Implementation

[0038] The specific embodiments are described below with reference to the accompanying drawings:

[0039] 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.

[0040] See Figures 1 to 3As 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 has a pump cavity 101, which includes a first cavity 101a and a second cavity 101b, which are not connected. When the electric pump is working, the first cavity 101a has a working medium flowing through it, while the second cavity 101b does not have a working medium flowing through it. The stator assembly 3 includes a stator winding 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 cavity 101a, and at least a portion of the stator winding 31 and at least a portion of the control assembly 4 are located in the second cavity 101b. In this embodiment, the stator winding 31 and the control assembly 4 are located in the second cavity 101b. The stator assembly 3 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 winding 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 winding 31, thereby controlling the excitation magnetic field generated by the stator winding 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, in other embodiments, the rotating assembly 2 and the pump shaft 33 are fixedly connected, and the pump shaft 33 rotates together with the rotating assembly 2.

[0041] Specifically, the rotating assembly 2 includes a rotor assembly 21 and an impeller assembly 22. A stator winding 31 surrounds the rotor assembly 21 and cooperates with it. When the stator winding 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 winding 31 needs to be insulated from the fluid medium. Thus, the electronic pump 100 in this embodiment includes a pump cavity 101. (See [reference]). Figure 3 As shown, the pump cavity 101 includes a first cavity 101a and a second cavity 101b that are isolated from each other. The pump cavity is divided into the first cavity 101a and the second cavity 101b by the isolation sleeve 32. At least a portion of the rotor assembly 21 and the impeller assembly 22 are disposed in the first cavity 101a, while the stator winding 31 is disposed in the second cavity 101b.

[0042] See Figure 3 As shown, the electric pump 100 also includes a pump cover 1 and a pump housing 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 pump housing 5 is provided with a first open end 52, which is specifically located at... Figure 3At the upper end of the pump housing 5, the pump cover 1 is placed over the first opening end 52, so the pump cover 1 and the pump housing 5 can enclose and form the pump inner cavity 101. The electric pump 100 also includes an isolation sleeve 32, which is disposed in the pump housing 5. The isolation sleeve 32 has an opening end facing the pump cover 1. The isolation sleeve 32 divides the pump inner cavity 101 into a first cavity 101a and a second cavity 101b. The inner cavity of the isolation sleeve 32 can form at least a part of the first cavity 101a. In this embodiment, the first cavity 101a includes the inner cavity of the pump cover 1 and the inner cavity of the isolation sleeve 32.

[0043] It is understood that in this embodiment, the rotating component 2, stator winding 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 pump housing 5 can be provided with the aforementioned first opening end 311 at one end of the axial direction. The pump cover 1 is axially covered on the first opening end 52. 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 that protrudes axially from the main body 13 of the pump cover 1. The outlet 12 is also a tubular structure and is approximately perpendicular to the inlet 11. See [reference needed]. 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 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.

[0044] The inventors discovered that because the length of the isolation sleeve in the axial direction is greater than the length of the stator core, the stator does not sufficiently constrain the isolation sleeve. As a result, the isolation sleeve will vibrate and generate noise when the water pump is running at high speed, which in turn affects the vibration and noise performance of the electric pump. Therefore, it is necessary to increase the constraint on the isolation sleeve to reduce the vibration and noise of the electric pump.

[0045] As one implementation method, see Figure 1-17As shown, an electric pump 100 includes a pump cover 1, a stator assembly 3, and a pump housing 5. The pump cover 1 and the pump housing 5 are fixedly connected or limitedly connected. The electric pump 100 has a pump cavity 101, and the stator assembly 3 is located in the pump cavity 101. The pump cavity 101 includes a first cavity 101a and a second cavity 101b. The stator assembly 3 includes a stator winding 31 and an isolation sleeve 32. The isolation sleeve 32 and the pump cover 1 form the first cavity 101a, and the isolation sleeve 32 and the pump housing 5 form the second cavity 101b. It can be understood that the isolation sleeve 32 divides the pump cavity 101 into the first cavity 101a and the second cavity 101b. For details, see [link to documentation]. Figure 2 As shown, in this embodiment, the first cavity 101a includes the inner cavity of the pump cover 1 and the inner cavity of the isolation sleeve 32. The rotating assembly 2 is located in the first cavity 101a. The second cavity 101b is the inner cavity between the isolation sleeve 32 and the pump cover 1. It can be understood that the isolation sleeve 32 is sealed to the pump cover 1, so that the first cavity 101a and the second cavity 101b are not connected. More specifically, the working medium flows through the first cavity 101a, while no working medium flows through the second cavity 101b. The stator winding 31 is located in the second cavity 101b. Specifically, the stator winding 31 and the control assembly 4 are located in the second cavity 101b, and the stator winding 31 and the control assembly 4 are electrically connected. It can be understood that both the stator assembly 3 and the control assembly 4 need to be isolated from the working medium. The electric pump 100 also includes a constraint portion 316. The stator winding 31 includes a stator core 311. Along the radial direction of the electric pump 100, the constraint portion 316 is located on the outer periphery of the isolation sleeve 32. Specifically, the isolation sleeve 32 includes a cylindrical portion 323, and the constraint portion 316 is located on the outer periphery of the cylindrical portion 323. Along the axial direction of the electric pump 100, the constraint portion 316 is located at the end of the stator core 311. Preferably, the constraint portion 316 is located at the second end 3112 of the stator core 311. It is understood that the interference fit between the stator core 311 and the isolation sleeve 32 provides constraint on the isolation sleeve 32. The portion of the isolation sleeve 32 that extends beyond the stator core 311 in the axial direction of the electric pump 100 lacks constraint. Placing the constraint portion 316 at the end of the stator core 311 helps to increase the constraint capability of the isolation sleeve 32 in the axial direction. Specifically, the constraint portion 316 includes several sub-constraint portions 3161, see [link to relevant documentation]. Figure 11 and Figure 13 As shown, in this embodiment, the stator has six stator teeth, and each stator tooth is provided with a sub-constraint portion 3161. The total number of sub-constraint portions 3161 is six. Of course, in other embodiments, the number of sub-constraint portions 3161 of the constraint portion 316 can be different. At least a portion of the constraint portion 316 abuts against the isolation sleeve 32. It should be noted that the radial direction of the electric pump 100 is the direction perpendicular to the axial direction of the electric pump 100. Here and below, the axial direction of the electric pump 100 is the direction along the height of the electric pump 100. See [reference needed]. Figure 2As shown, the height direction of the electric pump 100 is in the direction of arrow "H". It can be understood that the restraining part, by abutting against the isolation sleeve, increases the restraint of the stator winding on the end of the isolation sleeve. This method achieves an interference fit between the stator winding and the isolation sleeve, which helps to increase the restraint of the stator winding on the end of the isolation sleeve, thereby helping to reduce the vibration and noise of the electric pump.

[0046] As one implementation method, see Figure 8 and Figure 9 As shown, the stator core 311 includes a first end 3111 and a second end 3112. Along the axial direction of the electric pump 100, the first end 3111 is closer to the pump cover 1 than the second end 3112. The constraint part 316 includes a first constraint part 317, which is located at the second end 3112. For details, see [link to documentation]. Figure 7 As shown, the isolation sleeve 32 includes an open end 322 and an end 321. Along the axial direction of the electric pump 100, the first end 3111 is close to the open end 322 of the isolation sleeve 32, and the second end 3112 is close to the end 321 of the isolation sleeve 32. It can be understood that the axial length of the isolation sleeve is greater than the length of the stator core. The isolation sleeve protrudes from the stator core along the first end and / or the second end. The portion protruding from the stator core lacks constraint. In this embodiment, the first constraint portion 317 located at the second end 3112 provides constraint to the end 321 of the isolation sleeve 32. Of course, in other embodiments, the constraint portion may also include a second constraint portion located at the first end. Both the first and second constraint portions are interference-fitted with the isolation sleeve. This method helps to improve the constraint at the end of the isolation sleeve.

[0047] As one implementation method, see Figures 11 to 17 As shown, the insulating frame 313 includes a sub-frame 319, which is correspondingly arranged with the teeth of the stator core 311. The constraint part 316 includes a sub-constraint part 3161, which is correspondingly arranged with the sub-frame 319. The number of sub-constraint parts 3161 and sub-frames 319 is equal. For details, see [link to documentation]. Figure 11As shown, in this embodiment, the stator core 311 has six teeth, the corresponding sub-frame 319 has six teeth, and the corresponding sub-constraint parts 3161 have six teeth. Of course, in other embodiments, the number of stator core teeth may not be six. It should be noted that not every stator tooth needs to have a corresponding sub-constraint part 3161. For example, with six stator teeth and three constraint parts, one constraint part is provided for every other stator tooth, which still provides constraint on the end of the isolation sleeve. The sub-constraint part 3161 and the sub-frame 319 are an integral structure. Specifically, the sub-constraint part 3161 and the sub-frame 319 are integrally injection molded. Of course, the sub-constraint part 3161 and the sub-frame 319 can also be separate structures, fixedly connected or limited connected by assembly, which can also achieve the function of the sub-constraint part. This method helps to improve the constraint effect on the isolation sleeve.

[0048] Furthermore, as one implementation method, see [link to relevant documentation]. Figure 9 As shown, the stator winding 31 includes a stator core 311 and an insulating frame 313. Specifically, the stator core 311 and the insulating frame 313 are fixedly connected. Along the radial direction of the electric pump 100, a restraining part 316 protrudes from the inner wall surface of the stator core 311. The inner wall surface of the stator core 311 is the wall surface near the radially inner side. It should be noted that "radially inner side" here refers to the direction along the radial direction of the electric pump and near the axis of the electric pump 100. The restraining part 316 is interference-fitted with the isolation sleeve 32. For details, see [link to documentation]. Figure 8 As shown, there is a first dimension between the constraint part 316 and the isolation sleeve 32. More specifically, the first dimension between the constraint part 316 and the isolation sleeve 32 is in the range of 0.1mm-0.2mm. The stator core 311 is also interference-fitted with the isolation sleeve 32. It can be understood that the first dimension between the constraint part 316 and the isolation sleeve 32 is larger than the first dimension between the stator core 311 and the isolation sleeve 32. In this way, it is beneficial for the constraint part to apply constraint to the isolation sleeve.

[0049] Furthermore, as a means of implementation, participation Figures 11 to 15 As shown, along the axial direction of the electric pump 100, the sub-constraint part 3161 includes a head part 3161c and a tail part 3161d. The head part 3161c is closer to the pump cover 1 than the tail part 3161d. The first dimension between the stator core 311 and the isolation sleeve 32 gradually increases from the head part 3161c to the tail part 3161d. It can be understood that the isolation sleeve 32 is assembled into the inner hole of the stator core from top to bottom. The first dimension between the isolation sleeve 32 and the constraint part 316 is smaller at the top and larger at the bottom. The first dimension gradually increases from the beginning of assembly to the final assembly. This can ensure the ease of assembly of the isolation sleeve while also satisfying the stability of the isolation sleeve when it is in place. Even under the condition of high-speed operation of the water pump, the vibration and noise of the isolation sleeve can be reduced.

[0050] Specifically, the isolation sleeve 32 is installed into the inner hole of the stator along the direction from the head portion 3161c to the tail portion 3161d. During assembly, the head portion 3161c first mates with the isolation sleeve 32. Along the radial direction of the electric pump 100, the tail portion 3161d protrudes longer from the second stop portion 3153 than the head portion 3161c. The first dimension of the constraint portion 316 and the isolation sleeve 32 gradually increases along the direction from the head portion 3161c to the tail portion 3161d. It can be understood that the tail portion 3161d is closer to the center of the circle formed by the constraint portion 316 compared to the head portion 3161c. In this way, the first dimension of the constraint portion and the isolation sleeve gradually increases from the start of assembly to the final assembly, which improves the ease of assembly of the isolation sleeve and also ensures the stability of the isolation sleeve after assembly.

[0051] As another implementation method, see Figures 16-17 As shown, the second insulating frame 315' includes a constraint part 316', and the sub-constraint part 3161' includes a head part 3161c' and a tail part 3161d'. The first dimension between the stator core 311 and the isolation sleeve 32 remains unchanged along the direction from the head part 3161c' to the tail part 3161d'. It can be understood that the isolation sleeve 32 is installed into the inner hole of the stator along the direction from the head part 3161c' to the tail part 3161d'. The first dimension between the isolation sleeve 32 and the constraint part 316' remains unchanged from the start of assembly to the final assembly, which is beneficial to improving the ease of assembly of the isolation sleeve and can also meet the stability of the isolation sleeve when it is in place. Even under the condition of high-speed operation of the water pump, the vibration and noise of the isolation sleeve can be reduced.

[0052] Furthermore, as one implementation method, see [link to relevant documentation]. Figure 12 As shown, along the radial direction of the electric pump 100, the sub-constraint portion 3161 includes an inner end portion 3161a and an outer end portion 3161b. The inner end portion 3161a abuts against the isolation sleeve 32. The width of the sub-constraint portion 3161 gradually decreases from the outer end portion 3161b toward the inner end portion 3161a. Specifically, see [link to documentation]. Figure 13 As shown, the constraint portion 316 is enclosed in a circle, with the inner end portion 3161a close to the center of the circle, and the outer end portion 3161b away from the center relative to 3161a. The inner end portion 3161a is interference-fitted with the isolation sleeve 32. For more details, see... Figure 14As shown, the width of the sub-constraint portion 3161 is defined as w, the width of the sub-constraint portion 3161 at the outer end 3161b is w2, and the width of the sub-constraint portion 3161 at the inner end 3161a is w1. w2 is greater than w1. More specifically, the width w of the sub-constraint portion 3161 gradually decreases from the outer end 3161b towards the inner end 3161a. In this embodiment, see... Figures 11 to 15 The planes where the inner end portion 3161a and the outer end portion 3161b are located are approximately triangular. Of course, in other embodiments, they can also be quadrilateral, pentagonal, or other shapes. It can be understood that the structure of the outer end portion being wider and the inner end portion being narrower can ensure the structural strength of the constraint part, avoid the constraint part from being subjected to excessive force and breaking during the assembly process with the isolation sleeve, and at the same time save the material used for the constraint part. In this way, it is beneficial to improve the structural strength of the constraint part and save as much material as possible for the constraint part.

[0053] As one implementation method, see Figure 12 As shown, see Figures 11 to 17 As shown, the plane perpendicular to the central axis of the electric pump 100 is defined as the first plane. The projection of the tail portion 3161d onto the first plane includes the projection of the head portion 3161c onto the first plane. Specifically, the cross-sectional area of ​​the sub-constraint portion 3161 in the radial direction of the electric pump 100 gradually increases from the head portion 3161c to the tail portion 3161d. See [link to relevant documentation]. Figure 9 and Figure 11 As shown, it can be understood that since the second winding portion 3152 is provided with a winding 312, and the length of the second stop portion 3153 in the axial direction of the electric pump 100 is greater than the length of the second winding portion 3152, in order to ensure the overall strength of the second stop portion 3153, the thickness of the portion of the second stop portion 3153 that is longer than the second winding portion 3152 in the axial direction of the electric pump is increased, thereby improving the strength of this portion. This method helps to improve the strength of the constraint portion and reduces the risk of breakage when the constraint portion and the isolation sleeve are subjected to stress.

[0054] As one implementation method, see Figure 12 As shown, along the radial direction of the electric pump 100, the sub-constraint portion 3161 is recessed in the radially outward direction with a recess 3161e, and the recess 3161e has a gap with the isolation sleeve 32. It can be understood that the constraint portion 316 applies a constraint force to the isolation sleeve 32 by protruding from the stator core 311, thus constraining the isolation sleeve 32. The portion of the constraint portion 316 that does not protrude from the stator core 311 is recessed inward to form the recess 3161e, which reduces the material used in the constraint portion 316. This method helps to reduce the material used in the constraint portion.

[0055] Further, see Figure 14As shown, the recess 3161e includes a groove 3161f. Along the radial direction of the electric pump 100, from the inner end portion 3161a to the outer end portion 3161f, the width of the groove 3161f tends to decrease. In this way, it is beneficial to reduce the material used in the restraint part and ensure the structural strength of the restraint part.

[0056] As one implementation method, see Figures 1 to 8 As shown, the isolation sleeve 32 includes a cylindrical portion 323. Along the axial direction of the electric pump 100, one end of the cylindrical portion 323 is an open end 322, and the other end of the cylindrical portion 323 is an end end 321. The open end 322 is closer to the pump cover 1 than the end end 321. Specifically, see [link to relevant documentation]. Figure 8 As shown, the open end 322 is located at the top of the isolation sleeve 32, and the end 321 is located at the bottom of the isolation sleeve 32. It should be noted that the terms "top," "bottom," and the directional terms mentioned below are defined relative to the structure shown in the corresponding figures. They are relative concepts and may vary depending on their location and usage. The open end 322 is sealed to the pump cover 1. Specifically, a sealing structure is provided between the open end 322 and the pump cover 1. The isolation sleeve 32 and the pump cover 1 are sealed through this sealing structure to achieve the seal of the electric pump 100. More specifically, a sealing ring is provided between the open end 322 and the pump cover 1. It can be understood that the first cavity 101a consists 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 cavity 101a, and the sealing ring prevents the working medium from leaking from the first cavity 101a to the outside of the electric pump 100. The open end 322 is fixedly connected or limited to the pump cover 1. Specifically, in this embodiment, see [reference needed]. Figure 4 and Figure 5 As shown, the open end 322 is connected to the pump cover 1 for a limiting connection. The first open end 52 of the pump cover 1 is provided with a protruding limiting structure, and the open end 322 of the isolation sleeve 32 is provided with a recessed limiting structure corresponding to the limiting structure in the first open end 52. The restraining part 316 is interference-fitted with the end 321. It can be understood that the isolation sleeve divides the pump cavity into a first cavity and a second cavity, and prevents the working medium from leaking from the first cavity.

[0057] See Figures 1 to 10 As shown, in one implementation, the stator winding 31 further includes a winding 312, which is wound around an insulating frame 313. The insulating frame 313 includes a first insulating frame 314 and a second insulating frame 315. Specifically, in this embodiment, see... Figure 10As shown, the insulating frame 313 is a split structure, comprising a first insulating frame 314 and a second insulating frame 315. The winding 312 is wound around the first insulating frame 314 and the second insulating frame 315. The second insulating frame 315 includes a restraint portion 316. It should be noted that in other embodiments, the insulating frame 313 may also be an integral structure. Along the axial direction of the electric pump 100, the first insulating frame 314 is farther from the end 321 relative to the second insulating frame 315. Specifically, see [link to documentation]. Figure 4 As shown, in the axial direction of the electric pump 100, the first insulating frame 314 is close to the opening end 322 of the isolation sleeve 32 and is located axially outside the stator core 311. The second insulating frame 315 is close to the end 321 of the isolation sleeve 32 and is also located axially outside the stator core 311. The second insulating frame 315 includes a constraint portion 316, which is interference-fitted with the end 321. Specifically, the constraint portion 316 protrudes from the stator core 311 in the radial direction of the electric pump 100. It can be understood that by providing the constraint portion 316 in the second insulating frame 315, the end 321 of the isolation sleeve 32 is fixed, thereby increasing the rigidity of the isolation sleeve 32 and reducing its noise and vibration. In this way, it is beneficial to increase the constraint at the end of the isolation sleeve, thereby reducing the vibration and noise of the isolation sleeve.

[0058] Further, see Figures 11 to 15 As shown, in one implementation, the second insulating frame 315 includes a second main body 3151, a second winding portion 3152, and a second stop portion 3153. The second main body 3151, the second winding portion 3152, and the second stop portion 3153 are integral parts. The winding of the second main body 3151 is along the radial direction of the electric pump 100. The second main body 3151, the second winding portion 3152, and the second stop portion 3153 are arranged sequentially from the radially outer side to the radially inner side. For details, see [link to documentation]. Figure 11 As shown, along the radial direction of the electric pump 100, the second winding portion 3152 protrudes radially inward from the second main body portion 3151, and the winding 312 is wound around the second winding portion 3152. The second stop portion 3153 protrudes radially inward from the second winding portion 3152 and contacts the isolation sleeve 32. More specifically, the cross-sectional area of ​​the second stop portion 3153 along the axial direction of the electric pump 100 is larger than the cross-sectional area of ​​the second winding portion 3152. It can be understood that increasing the area of ​​the second stop portion 3153 is beneficial to increasing the contact area between the second stop portion 3153 and the isolation sleeve 32 in the axial direction of the electric pump 100, thereby facilitating the fixation of the isolation sleeve 32. The second stop portion 3153 includes a constraint portion 316, which protrudes radially inward from the second stop portion 3153 towards the electric pump 100. In this embodiment, the constraint portion 316 is circular. See [reference needed]. Figure 6 and Figure 7As shown, the constraint portion 316 is evenly distributed in the inner ring of the second insulating frame 315. The isolation sleeve 32 is roughly cylindrical. The circular shape of the constraint portion 316 is more conducive to matching the shape of the isolation sleeve, thereby strengthening the constraint ability of the isolation sleeve. Of course, the constraint portion can also be in other shapes. It can be understood that the shape of the constraint portion corresponds to the shape of the isolation sleeve, thereby better matching the isolation sleeve and providing better constraint for the isolation sleeve.

[0059] See Figures 6 to 15 As shown, the constraint sub-part 316 includes a first sub-part 3162 and a second sub-part 3163. The first sub-part 3162 and the second sub-part 3163 are arranged along the radial direction of the electric pump 100 on the surface of the second stop 3153. Specifically, in this embodiment, the constraint sub-part 316 has two sub-parts. It should be noted that in other embodiments, the constraint sub-part 316 may have one, three, or other sub-parts. The first sub-part 3162 is interference-fitted with the end 321, and the second sub-part 3163 is also interference-fitted with the end 321. It can be understood that in this embodiment, there are a total of twelve constraint sub-parts with six constraint sub-parts. The twelve constraint sub-parts are evenly distributed and enclosed in a circle, and are interference-fitted with the isolation sleeve. In this way, it is beneficial to increase the constraint effect of the stator winding on the end of the isolation sleeve.

[0060] See Figure 2 , Figure 4 as well as Figure 11 As shown, the second insulating frame 315 includes a connecting and limiting part 3154, which connects the stator assembly 3 and the control assembly 4 into a whole. Thus, during the final assembly of the fluid pump 100, the stator assembly 3 and the control assembly 4 are positioned as a whole with the pump housing 5 and the isolation sleeve 32. This reduces the number of positioning points, simplifies the assembly process, and improves the assembly efficiency of the fluid pump. The connecting and limiting part 3154 includes at least a pin 3154a. One end of the pin 3154a is electrically connected to the stator assembly 3, and the other end is electrically connected to the control assembly. Specifically, the pin 3154a and the stator assembly 3 can be connected by a transition connection, an interference fit, or injection molding. The pin 3154a and the control assembly 4 can be welded. In this embodiment, the connecting limiting part 3154 includes a pin 3154a, which is made of metal. The pin 3154a is fixed to the stator assembly 3 by an interference fit, and the pin 3154 is welded to the control assembly 4. In this way, the stator assembly 3 and the control assembly 4 are mechanically connected as a whole through the pin 3154a, and at the same time, the stator assembly 3 and the control assembly 4 are electrically connected through the pin 3154a. In this way, the limiting structure is integrated on the insulating frame. During the final assembly of the electric pump, the stator assembly and the control assembly are positioned as a whole with the pump housing and the isolation sleeve. This reduces the number of positioning points, simplifies the assembly process, and improves the assembly efficiency of the fluid pump.

[0061] See Figure 4 and Figure 11 As shown, the connecting limiting part 3154 also includes a positioning post 3154b. One end of the positioning post 3154b is fixed to the stator assembly 3, and the free end of the positioning post 3154b is detachably connected to the control assembly 4. It can be understood that, to further increase the connection strength of the control assembly 4, the connecting limiting part 3154 also includes a positioning post 3154b. The main body of the positioning post 3154b is cylindrical, and the positioning post 3154b includes a cylindrical surface. Near the free end of the positioning post 3154b, the positioning post 3154b also includes a conical surface. The positioning post 3154b limits the control assembly 4 through the conical surface or the cylindrical surface. This method helps to improve the connection strength of the control assembly.

[0062] 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.

[0063] 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 method 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 electric pump (100) includes a pump cover (1) and a stator assembly (3). The pump has a pump cavity (101), and the stator assembly (3) is located within the pump cavity (101). The stator assembly (3) includes a stator winding (31) and an isolation sleeve (32). The isolation sleeve (32) is located within the pump cavity (101). The pump cavity (101) includes a first cavity (101a) and a second cavity (101b). The isolation sleeve (32) isolates the first cavity (101a) and the second cavity (101b). The first cavity (101a) and the second cavity (101b) are not in communication. The stator winding (31) is located in the second cavity (101b). The stator winding (31) includes a stator core (311). The electric pump (100) includes a constraint part (316). The constraint part (316) is fixedly connected to the stator core (311). Along the axial direction of the electric pump (100), the constraint part (316) is disposed at the end of the stator core (311). Along the radial direction of the electric pump (100), the stator core (311) is sleeved on the outer periphery of the isolation sleeve (32). The constraint part (316) and the isolation sleeve (32) are interference-fitted.

2. The electric pump (100) according to claim 1, characterized in that, Along the axial direction of the electric pump (100), the stator core (311) includes a first end (3111) and a second end (3112), the first end (3111) being closer to the pump cover (1) relative to the second end (3112), and the constraint part (316) including a first constraint part (317) located at the second end (3112).

3. The electric pump (100) according to claim 2, characterized in that, The stator winding (31) includes an insulating frame (313). The stator core (311) is fixedly connected to the insulating frame (313) or the stator core (311) and the insulating frame (313) are an integral structure. The constraint part (316) is fixedly connected to the insulating frame (313). Along the radial direction of the electric pump (100), the constraint part (316) protrudes from the inner wall surface of the stator core (311). The constraint part (316) is interference-fitted with the isolation sleeve (32).

4. The electric pump (100) according to claim 3, characterized in that, The insulating frame (313) includes a sub-frame (319), which is correspondingly arranged with the teeth of the stator core (311). The constraint part (316) includes a sub-constraint part (3161), which is correspondingly arranged with the sub-frame (319). The number of sub-constraint parts (3161) and sub-frames (319) is equal. The sub-constraint parts (3161) and sub-frames (319) are an integral structure.

5. The electric pump (100) according to claim 4, characterized in that, The sub-constraint portion (3161) extends along the axial direction of the electric pump (100). The sub-constraint portion (3161) includes a head portion (3161c) and a tail portion (3161d). Along the axial direction of the electric pump (100), the head portion (3161c) is close to the pump cover (1) relative to the tail portion (3161d). The head portion (3161c) abuts against the second end portion (3112). Along the radial direction of the electric pump (100), the head portion (3161c) is disposed away from the central axis of the electric pump (100) relative to the tail portion (3161d).

6. The electric pump (100) according to claim 4 or 5, characterized in that, Along the radial direction of the electric pump (100), the sub-constraint (3161) includes an inner end (3161a) and an outer end (3161b), the inner end (3161a) abutting against the isolation sleeve (32), and the width of the constraint (316) decreasing from the outer end (3161b) toward the inner end (3161a).

7. The electric pump (100) according to claim 6, characterized in that, Along the radial direction of the electric pump (100), the sub-constraint part (3161) is recessed in the radially outward direction with a recess (3161e), and the recess (3161e) has a gap with the isolation sleeve (32).

8. The electric pump (100) according to claim 7, characterized in that, The recess (3161e) includes a groove (3161f) along the radial direction of the electric pump (100), from the inner end (3161a) to the outer end (3161b), and the width of the groove (3161f) tends to decrease.

9. The electric pump (100) according to any one of claims 2-8, characterized in that, The isolation sleeve (32) includes a cylindrical portion (323) along the axial direction of the electric pump (100). One end of the cylindrical portion (323) is an open end (322), and the other end of the cylindrical portion (323) is an end end (321). The open end (322) is close to the pump cover (1) relative to the end end (321), and the end end (321) is interference-fitted with the first constraint portion (317).

10. The electric pump (100) according to claim 1, characterized in that, The stator core (311) includes a first end (3111) and a second end (3112). Along the axial direction of the electric pump (100), the first end (3111) is closer to the pump cover (1) than the second end (3112). The constraint part (316) includes a first constraint part (317) and a second constraint part (318). The first constraint part (317) is located at the second end (3112), and the second constraint part (318) is located at the first end (3111). Both the first constraint part (317) and the second constraint part (318) are interference-fitted with the isolation sleeve (32).

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