Pump cover structure and electronic water pump using same

Abstract

The utility model discloses a pump cover structure and an electronic water pump using the pump cover structure, and relates to the technical field of electronic water pumps and parts of the electronic water pumps. A thrust washer mounting seat structure is arranged on the inner side of the pump cover, the thrust washer mounting seat structure comprises a connecting beam and a supporting seat, and the supporting seat is supported on the inner side of the pump cover through the connecting beam; a plurality of buckle mounting holes are formed in the end face of a connecting beam and / or a supporting seat of the thrust washer mounting seat structure, the number and the positions of the buckle mounting holes are matched with those of buckle parts of thrust washers, and the buckle parts of the thrust washers are correspondingly buckled in the buckle mounting holes of the thrust washer mounting seat structure. The utility model mainly solves the problem of how to provide a reasonable thrust washer and a mounting structure thereof for the electronic water pump. According to the thrust washer, the installation reliability of the thrust washer is improved, meanwhile, the cost of the thrust washer is reduced, and the thrust washer does not need to be accurately positioned during installation.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic water pumps and parts thereof, in particular to a pump cover structure and an electronic water pump using the same. Background Art

[0002] New energy vehicles usually have two or more electronic water pumps. The electronic water pump is the power source for the entire cooling system of new energy vehicles. The power batteries, drive motors, etc. of new energy vehicles all need to rely on electronic water pumps to drive the coolant for circulation cooling.

[0003] The electronic water pump in the prior art generally includes a pump cover, a pump casing, a shaft core, a rotor assembly and a stator assembly; the pump cover and the pump casing are combined and fixed to each other to form a chamber, the two ends of the shaft core are respectively fixed on the pump cover and the pump casing, the rotor assembly is supported in the chamber between the pump cover and the pump casing by the shaft core, the stator assembly is arranged outside the chamber, and can magnetically couple and drive the rotor assembly to rotate in the chamber between the pump cover and the pump casing, thereby driving the water flow through the impeller on the rotor assembly to make the water flow flow in a directional manner.

[0004] When the electronic water pump of the above structure is working, the high-speed operation of its rotor assembly will cause the pressure at the impeller to decrease, resulting in a pressure difference on both sides of the rotor assembly. At this time, the rotor assembly will move toward the pump cover, causing friction between the rotor assembly and the pump cover. Since the pump cover is an integrally formed workpiece, the friction between the rotor assembly and the pump cover can easily reduce the service life of the electronic water pump.

[0005] At present, it is generally necessary to install a thrust washer on the pump cover to prevent the rotor assembly from directly contacting and rubbing with the pump cover, thereby increasing the service life of the electronic water pump; however, the thrust washer in the prior art is usually made of metal or ceramic material, which has the following disadvantages:

[0006] 1. The thrust washers made of metal materials such as stainless steel have large cutting sizes, low material utilization, and high parts costs. In addition, the thrust washers need to be precisely positioned when installed on the pump cover, resulting in low installation efficiency and the risk of falling off after installation;

[0007] 2. The Chinese utility model patent announcement with publication number CN214742124U and titled "A thrust washer positioning mechanism for an electronic water pump" discloses a typical structure of a thrust washer made of ceramic material applied to an electronic water pump. However, although this structure can improve installation efficiency and reduce the risk of thrust washers falling off, the thrust washer made of ceramic material itself is expensive, and during assembly, the thrust washer needs to be interference fit with the mounting structure on the pump cover, or the thrust washer needs to be installed by in-mold injection molding. Both assembly methods will squeeze the thrust washer, which can easily damage the thrust washer itself.

[0008] In summary, how to provide a reasonable thrust washer and its mounting structure for the electronic water pump to increase the service life of the electronic water pump and reduce the cost and assembly difficulty of the electronic water pump has become an urgent problem to be solved. Utility Model Content

[0009] The utility model aims to provide a pump cover structure and an electronic water pump using the same, which has a thrust washer which is low in cost and easy to assemble.

[0010] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pump cover structure, which is applied to an electronic water pump, and includes a pump cover and a thrust washer; the pump cover is formed with a water inlet and a water outlet that pass through the inner and outer sides thereof; a thrust washer mounting seat structure is arranged on the inner side of the pump cover, and the thrust washer mounting seat structure includes a connecting beam and a support seat, one end of the connecting beam is connected to the inner side of the pump cover, and the other end of the connecting beam is connected to the support seat to support the support seat on the inner side of the pump cover; the thrust washer includes a main body A circular ring portion, and a plurality of snap-on portions integrally formed on the main circular ring portion; a plurality of snap-on mounting holes are opened at the end faces of the connecting beam and / or the support seat of the thrust washer mounting seat structure, and the number and positions of the snap-on mounting holes match the snap-on portions of the thrust washer; the snap-on portions of the thrust washer are correspondingly snapped into the snap-on mounting holes of the thrust washer mounting seat structure to fix the main circular ring portion of the thrust washer to the end face of the support seat of the thrust washer mounting seat structure.

[0011] In the above technical solution, the buckle mounting hole of the thrust washer mounting seat structure is a blind hole structure.

[0012] In the above technical solution, the connecting beams of the thrust washer mounting seat structure are arranged around the water inlet of the pump cover, so that the support seat is coaxial with the water inlet of the pump cover.

[0013] In the above technical solution, the support seat of the thrust washer mounting seat structure is connected to the inner side of each of the connecting beams; the buckle mounting hole of the thrust washer mounting seat structure is provided at the end surface of the connecting beam.

[0014] In the above technical solution, the snap-in part of the thrust washer includes a first snap-in strip and a second snap-in strip; one end of the first snap-in strip is connected to the main annular part, and the other end of the first snap-in strip is connected to the second snap-in strip; the first snap-in strip extends from the main annular part in an axial direction away from the main annular part, and the second snap-in strip folds back from the position where it is connected to the first snap-in strip and extends in a direction close to the main annular part.

[0015] In the above technical solution, the thrust washer is a thin plate made of metal material and is made through a stamping process.

[0016] In the above technical solution, the thrust washer and the support seat of the thrust washer mounting seat structure can allow the shaft core of the electronic water pump to penetrate therein in sequence.

[0017] An electronic water pump comprises the above-mentioned pump cover structure.

[0018] In the above technical scheme, the electronic water pump of the utility model also includes a rotor assembly, a pump chamber structure shell, a stator-pump shell assembly, a drive circuit board, a rear end cover and an axis core; the rotor assembly includes a rotor bracket, a shaft sleeve, a magnetic ring and an impeller, the shaft sleeve is inserted into the rotor bracket, the magnetic ring is sleeved outside the rotor bracket, and the impeller is fixed on the rotor bracket; the pump cover and the pump chamber structure shell are fixedly combined with each other to form a pump chamber structure; one end of the axis core is fixedly matched with the pump chamber structure shell, and the other end of the axis core is fixedly matched with the pump cover to support the axis core in the pump chamber structure; the shaft sleeve of the rotor assembly is sleeved on the axis core and rotates with the axis core; the stator- The pump casing assembly includes a pump casing and a stator assembly, wherein the pump casing is molded outside the stator assembly in an overmolding manner so that the stator assembly is buried in the pump casing; the pump cover, the pump chamber structure shell and the pump casing of the stator-pump casing assembly are fixed in sequence along the axial direction so that the stator assembly of the stator-pump casing assembly and the magnetic ring of the rotor assembly are aligned with each other in the radial direction; the drive circuit board is accommodated and fixed in the pump casing, and the end cover is fixed at one end of the pump casing and covers the opening of the pump casing; the drive circuit board is electrically connected to the stator assembly of the stator-pump casing assembly so that the stator assembly can magnetically couple and drive the rotor assembly to rotate in the pump chamber structure with the shaft core as the axis.

[0019] In the above technical solution, one end of the shaft core sequentially penetrates the thrust washer and the support seat of the thrust washer mounting seat structure.

[0020] Compared with the prior art, the beneficial effects of the utility model are as follows: the buckle part of the thrust gasket of the pump cover structure of the utility model and the electronic water pump using the same are correspondingly buckled in the buckle mounting hole of the thrust gasket mounting seat structure, so that the main annular part of the thrust gasket is fixed closely to the end face of the support seat of the thrust gasket mounting seat structure, thereby improving the reliability of the installation of the thrust gasket; at the same time, the structure reduces the cost of the thrust gasket itself, and there is no need to accurately position the thrust gasket during installation, nor is there any need to adopt costly processes such as in-mold injection molding, thereby also improving its assembly efficiency and reducing its assembly cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an exploded view of the pump cover structure in the utility model.

[0022] Figure 2 It is a cross-sectional view of the pump cover structure in the utility model.

[0023] Figure 3 for Figure 2 A is a partial enlarged view of the figure.

[0024] Figure 4 It is a structural view of the thrust washer in the utility model.

[0025] Figure 5 It is a three-dimensional view of the electronic water pump in the utility model.

[0026] Figure 6 This is an exploded view of the electronic water pump in the present invention.

[0027] Figure 7 It is a cross-sectional view of the electronic water pump in the present utility model.

[0028] Figure 8 It is a cross-sectional view of the pump chamber structure in the utility model.

[0029] The accompanying drawings are marked as follows: 1. Pump cover; 11. Thrust washer mounting seat structure; 111. Connecting beam; 112. Support ring; 113. Buckle mounting hole; 12. Water inlet; 13. Water outlet; 2. Thrust washer; 21. Main body annular portion; 22. Buckle portion; 221. First buckle strip; 222. Second buckle strip; 3. Rotor assembly; 31. Rotor bracket; 32. Bushing; 33. Magnetic ring; 34. Impeller; 4. Pump chamber structure shell; 41. Bottom plate; 5. Stator-pump housing assembly; 51. Pump housing; 52. Stator assembly; 6. Drive circuit board; 7. Rear end cover; 8. Shaft core; 10. Pump chamber structure. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] This embodiment provides a pump cover structure, which is applied to an electronic water pump.

[0032] See also Figure 1-Figure 4 The pump cover structure of this embodiment includes a pump cover 1 and a thrust washer 2.

[0033] The pump cover 1 is an integrally formed cover body made of engineering plastic material.

[0034] The pump cover 1 is formed with a water inlet 12 and a water outlet 13 penetrating through both sides thereof. In fact, the water inlet 12 and the water outlet 13 are both short hard tubes integrally formed on the pump cover 1 .

[0035] A thrust washer mounting seat structure 11 is provided on the inner side of the pump cover 1, and the thrust washer mounting seat structure 11 includes a connecting beam 111 and a support seat 112, one end of the connecting beam 111 is connected to the inner side of the pump cover 1, and the other end of the connecting beam 111 is connected to the support seat 112 to support the support seat 112 on the inner side of the pump cover 1; specifically, the connecting beam 111 and the support seat 112 are both structures integrally formed on the pump cover 1, wherein the connecting beam 111 is columnar, and the support seat 112 is a seat body with an axial hole.

[0036] The thrust washer 2 includes a main annular portion 21 and a plurality of buckle portions 22 integrally formed on the main annular portion 21 .

[0037] A plurality of snap-fit ​​mounting holes 113 are provided at the end faces of the connecting beam 111 and / or the supporting seat 112 of the thrust washer mounting seat structure 11, and the number and positions of the snap-fit ​​mounting holes 113 match the snap-fit ​​portion 22 of the thrust washer 2; in the present embodiment, three snap-fit ​​portions 22 of the thrust washer 2 are evenly arranged along the circumference of the main annular portion 21, and correspondingly, three snap-fit ​​mounting holes 113 are also evenly arranged at the end face of the thrust washer mounting seat structure 11.

[0038] The buckle portion 22 of the thrust washer 2 is correspondingly buckled into the buckle mounting hole 113 of the thrust washer mounting seat structure 11 to fix the main annular portion 21 of the thrust washer 2 to the end surface of the support seat 112 of the thrust washer mounting seat structure 11 in a close relationship.

[0039] Furthermore, the snap-on mounting hole 113 of the thrust washer mounting seat structure 11 is a blind hole structure, that is, the snap-on mounting hole 113 is open at the end surface of the connecting beam 111 and / or the support seat 112, and is closed inside the connecting beam 111 and / or the support seat 112; setting the snap-on mounting hole 113 as a blind hole structure is beneficial to improving the fluidity of the liquid at the connecting beam 111 and / or the support seat 112, and secondly, it can prevent the thrust washer 2 from rotating, shifting or falling off, and thirdly, it is beneficial to the demolding process of the pump cover 1 after injection molding, and reduces the core pulling structure of the injection mold, thereby reducing the design cost of the injection mold.

[0040] Furthermore, the connecting beams 111 of the thrust washer mounting seat structure 11 are arranged around the water inlet 12 of the pump cover 1, so that the support seat 112 is coaxial with the water inlet 12 of the pump cover 1; in this embodiment, three connecting beams 111 are arranged and are evenly distributed around the water inlet 12 of the pump cover 1; with this arrangement, the closed end of the support seat 112 can guide the liquid introduced into the water inlet 12.

[0041] Furthermore, the support seat 112 of the thrust washer mounting seat structure 11 is connected to the inner side of each connecting beam 111, that is, the outer diameter of the support seat 112 is less than or equal to the inner diameter of the circle surrounded by each connecting beam 111; the snap-fit ​​mounting hole 113 of the thrust washer mounting seat structure 11 is opened at the end face of the connecting beam 111, that is, the three snap-fit ​​mounting holes 113 of the thrust washer mounting seat structure 11 are respectively opened at the end face of each connecting beam 111; with this arrangement, the cross-sectional area of ​​the thrust washer mounting seat structure 11 in the radial direction can be minimized to the greatest extent, thereby providing more flow cross-sectional area for the liquid introduced into the water inlet 12.

[0042] See also Figure 4 The buckle part 22 of the thrust washer 2 includes a first buckle strip 221 and a second buckle strip 222; one end of the first buckle strip 221 is connected to the main ring part 21, and the other end of the first buckle strip 221 is connected to the second buckle strip 222; the first buckle strip 221 extends from the main ring part 21 in an axial direction away from the main ring part 21, and the second buckle strip 222 folds back from the position where it is connected to the first buckle strip 221 and extends in a direction close to the main ring part 21; in this way, the buckle part 22 forms a "V"-shaped structure.

[0043] It should be noted that the thrust washer 2 is a thin plate made of metal material through a stamping process, that is, the first snap strip 221 and the second snap strip 222 of the snap part 22 are both formed by bending a stamping die, and the inner hole of the main annular part 21 is formed by a punching process.

[0044] Furthermore, the thrust washer 2 and the support seat 112 of the thrust washer mounting seat structure 11 can allow the shaft core 8 of the electronic water pump to pass through them in sequence; that is, the thrust washer 2 and the support seat 112 of the thrust washer mounting seat structure 11 are both provided with axial holes, and after the thrust washer 2 and the thrust washer mounting seat structure 11 are fixed to each other, the axial holes of the thrust washer 2 and the support seat 112 are aligned with each other to allow the shaft core 8 of the electronic water pump to pass through them in sequence; wherein, the shaft core 8 of the electronic water pump can be interference fit or key fit with the axial hole of the support seat 112.

[0045] This embodiment also provides an electronic water pump, which includes the above-mentioned pump cover structure.

[0046] See also Figure 5-Figure 8 The electronic water pump of this embodiment also includes a rotor assembly 3, a pump chamber structure shell 4, a stator-pump shell assembly 5, a drive circuit board 6, a rear end cover 7 and a shaft core 8.

[0047] Among them, the pump chamber structure shell 4 is an integrally formed thin shell component of engineering plastic material, which can allow the magnetic field to pass through; the driving circuit board 6 is a printed circuit board (PCB), which is equipped with a main control, a stator drive module and necessary peripheral circuits for driving the stator assembly 52 to operate; the rear end cover 7 is a metal cover plate, which is used as one of the shielding and protection structures of the electronic water pump; the shaft core 8 is an integrally formed metal shaft, such as stainless steel or aluminum alloy.

[0048] The rotor assembly 3 includes a rotor support 31, a sleeve 32, a magnetic ring 33 and an impeller 34; wherein the rotor support 31 is an integral injection-molded annular support for providing an overall support base for the rotor assembly 3; the impeller 34 is an integral injection-molded engineering plastic component with a plurality of blades thereon; the magnetic ring 33 is a magnetic metal ring body that can be magnetically coupled with the stator assembly 52 to drive the rotor assembly 3 to rotate; the sleeve 32 is an integrally molded annular workpiece of graphite material / ceramic material, which has a self-lubricating function; the sleeve 32 is inserted into the rotor support 31, and the magnetic ring 33 is sleeved outside the rotor support 31. In fact, the sleeve 32 and the magnetic ring 33 are respectively placed in the mold of the rotor support 31, and the rotor support 31 is molded by integral injection molding. After the rotor support 31 is molded, it is combined with the sleeve 32 and the magnetic ring 33 as a whole; the impeller 34 is fixed on the rotor support 31. In this embodiment, the blades of the impeller 34 are fixed on the mounting table of the rotor support 31 by ultrasonic welding.

[0049] After the pump cover 1 and the pump chamber structure shell 4 are fixedly combined with each other, a pump chamber structure 10 is formed. Specifically, the pump chamber structure shell 4 and the pump cover 1 are combined into one by screws or snaps, and are sealed by a sealing ring, so that the inner cavity of the pump chamber structure shell 4 and the inner cavity of the pump cover 1 are enclosed to form the pump chamber structure 10.

[0050] One end of the shaft core 8 is fixedly matched with the pump chamber structure shell 4, and the other end of the shaft core 8 is fixedly matched with the pump cover 1 to support the shaft core 8 in the pump chamber structure 10; wherein the pump chamber structure shell 4 is manufactured by one-piece injection molding, and one end of the shaft core 8 is buried in the bottom plate 41 of the pump chamber structure shell 4 by one-piece injection molding, thereby achieving fixed matching with the pump chamber structure shell 4; the other end of the shaft core 8 is inserted into the thrust washer 2 and the support seat 112 of the thrust washer mounting seat structure 11 in turn, and is interference fit or key fit with the axial hole of the support seat 112.

[0051] The shaft sleeve 32 of the rotor assembly 3 is sleeved on the shaft core 8 and rotatably cooperates with the shaft core 8 , that is, the rotor assembly 3 uses its shaft sleeve 32 as a bearing and the shaft core 8 as a fixed shaft to rotate in the pump chamber structure 10 .

[0052] The stator-pump casing assembly 5 includes a pump casing 51 and a stator assembly 52, wherein the stator assembly 52 includes a stator core, an enameled wire coil wound on the stator core and distributed circumferentially, and a terminal plugged and fixed on the stator core and electrically connected to the end of the enameled wire coil; the pump casing 51 is formed outside the stator assembly 52 in a covering molding manner, so that the stator assembly 52 is buried in the pump casing 51. When the stator-pump casing assembly 5 is manufactured, the stator assembly 52 is placed as a whole in the molding of the pump casing 51. The pump housing 51 is formed by injecting plastic into the mold, and then the plastic is solidified to form the pump housing 51. At this time, the stator assembly 52 and the pump housing 51 are formed as a whole to form a stator-pump housing assembly 5. The pump cover 1, the pump chamber structure shell 4 and the pump housing 51 of the stator-pump housing assembly 5 are fixed in sequence along the axial direction (specifically, fixed by screws), so that the stator assembly 52 of the stator-pump housing assembly 5 and the magnetic ring 33 of the rotor assembly 3 are aligned with each other in the radial direction. At this time, the magnetic ring 33 of the rotor assembly 3 is positioned The pump housing 51 is provided with a sealing ring, and the pump housing 51 is provided with a sealing ring. The sealing ring is provided between the pump housing 4 and the stator-pump housing assembly 5 to strengthen the sealing degree inside the stator-pump housing assembly 5. The driving circuit board 6 is accommodated and fixed in the pump housing 51 (specifically fixed by screws). The rear end cover 7 is fixed at one end of the pump housing 51 and covers the opening of the pump housing 51 (specifically fixed by screws). The rear end cover 7 is fixed at one end of the pump housing 51 and covers the opening of the pump housing 51 (specifically fixed by screws). The sealing ring is provided between the rear end cover 7 and the stator-pump housing assembly 5 to strengthen the sealing degree inside the stator-pump housing assembly 5. The driving circuit board 6 is electrically connected to the stator component 52 of the stator-pump housing assembly 5, so that the stator component 52 can magnetically couple and drive the rotor component 3 to rotate in the pump chamber structure 10 with the shaft core 8 as the axis. Specifically, the terminal of the stator component 52 is exposed to the pump housing 51 (but located in the inner space of the pump housing 51) and is welded to the driving circuit board 6, thereby realizing the electrical connection between the driving circuit board 6 and the stator component 52, so that the driving circuit board 6 can drive the stator component 52 to operate.

[0053] When the electronic water pump of this embodiment is in use, the driving circuit board 6 is energized, and the coil of the stator assembly 52 is energized through the terminal, so that a rotating magnetic field is formed in the space of the inner ring of the stator assembly 52, thereby driving the entire rotor assembly 3 to rotate in the pump chamber structure 10 through magnetic coupling with the magnetic ring 33 of the rotor assembly 3; the rotating impeller 34 can drive the liquid to flow along its blades, and the water flows into the pump cover 1 from the water inlet 12 and flows toward the water outlet 13, thereby realizing the basic function of the electronic water pump; in the above process, the rotor assembly 3 will inevitably have axial movement when rotating. At this time, at least a part of the rotor assembly 3 (the end face of the shaft sleeve 32 in this embodiment) is in contact with the thrust washer 2, thereby avoiding direct friction between the rotor assembly 3 and the pump cover 1, thereby improving the service life of the pump cover 1.

[0054] The pump cover structure of the present embodiment and the electronic water pump using the same, the buckle portion 22 of the thrust washer 2 is correspondingly buckled into the buckle mounting hole 113 of the thrust washer mounting seat structure 11, so that the main annular portion 21 of the thrust washer 2 is closely fixed to the end surface of the support seat 112 of the thrust washer mounting seat structure 11, thereby improving the reliability of the installation of the thrust washer 2; at the same time, this structure reduces the cost of the thrust washer 2 itself, and there is no need to accurately position the thrust washer 2 during installation, nor is there any need to adopt costly processes such as in-mold injection molding, thereby improving its assembly efficiency and reducing its assembly cost.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pump cover structure, which is applied to an electronic water pump, characterized in that: Includes pump cover and thrust washer; The pump cover is formed with a water inlet and a water outlet which penetrate through the inner and outer sides thereof; A thrust washer mounting seat structure is provided on the inner side of the pump cover, and the thrust washer mounting seat structure includes a connecting beam and a supporting seat, one end of the connecting beam is connected to the inner side of the pump cover, and the other end of the connecting beam is connected to the supporting seat to support the supporting seat on the inner side of the pump cover; The thrust washer comprises a main annular portion, and a plurality of buckle portions integrally formed on the main annular portion; A plurality of buckle mounting holes are provided at the end surface of the connecting beam and / or the supporting seat of the thrust washer mounting seat structure, and the number and position of the buckle mounting holes match the buckle portion of the thrust washer; The buckle portion of the thrust washer is correspondingly buckled into the buckle mounting hole of the thrust washer mounting seat structure to fix the main annular portion of the thrust washer to the end surface of the support seat of the thrust washer mounting seat structure.

2. The pump cover structure according to claim 1, characterized in that: The buckle mounting hole of the thrust washer mounting seat structure is a blind hole structure.

3. The pump cover structure according to claim 1, characterized in that: The connecting beams of the thrust washer mounting seat structure are arranged around the water inlet of the pump cover, so that the support seat is coaxial with the water inlet of the pump cover.

4. The pump cover structure according to any one of claims 1 to 3, characterized in that: The support seat of the thrust washer mounting seat structure is connected to the inner side of each of the connecting beams; The buckle mounting hole of the thrust washer mounting seat structure is arranged at the end surface of the connecting beam.

5. The pump cover structure according to claim 1, characterized in that: The buckle portion of the thrust washer includes a first buckle strip and a second buckle strip; One end of the first buckle strip is connected to the main body annular portion, and the other end of the first buckle strip is connected to the second buckle strip; The first buckle strip extends from the main body annular portion in an axial direction away from the main body annular portion, and the second buckle strip folds back from the position where it is connected to the first buckle strip and extends in a direction close to the main body annular portion.

6. The pump cover structure according to claim 1 or 5, characterized in that: The thrust washer is a metal thin plate made by a stamping process.

7. The pump cover structure according to claim 1, characterized in that: The thrust washer and the support seat of the thrust washer mounting seat structure can allow the shaft core of the electronic water pump to penetrate therein in sequence.

8. An electronic water pump, characterized in that: It comprises the pump cover structure described in any one of claims 1-7.

9. The electronic water pump according to claim 8, characterized in that: It also includes a rotor assembly, a pump chamber structure shell, a stator-pump shell assembly, a drive circuit board, a rear end cover and a shaft core; The rotor assembly comprises a rotor support, a shaft sleeve, a magnetic ring and an impeller, wherein the shaft sleeve is inserted into the rotor support, the magnetic ring is sleeved outside the rotor support, and the impeller is fixed on the rotor support; The pump cover and the pump chamber structure shell are fixedly combined with each other to form a pump chamber structure; One end of the shaft core is fixedly matched with the pump chamber structure shell, and the other end of the shaft core is fixedly matched with the pump cover to support the shaft core in the pump chamber structure; The shaft sleeve of the rotor assembly is sleeved on the shaft core and is rotationally matched with the shaft core; The stator-pump housing assembly includes a pump housing and a stator assembly, wherein the pump housing is molded outside the stator assembly in an overmolding manner so that the stator assembly is buried in the pump housing; The pump cover, the pump chamber structure shell and the pump shell of the stator-pump shell assembly are fixed in sequence along the axial direction, so that the stator assembly of the stator-pump shell assembly and the magnetic ring of the rotor assembly are aligned with each other in the radial direction; The driving circuit board is accommodated and fixed in the pump housing, and the end cover is fixed to one end of the pump housing and covers the opening of the pump housing; The driving circuit board is electrically connected to the stator component of the stator-pump housing assembly, so that the stator component can magnetically couple and drive the rotor component to rotate in the pump chamber structure with the shaft core as the axis.

10. The electronic water pump according to claim 9, characterized in that: One end of the shaft core sequentially penetrates the thrust washer and the support seat of the thrust washer mounting seat structure.

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