Electric pump

Abstract

An electric pump, comprising an impeller assembly, which comprises a plurality of first torsion blades, an upper plate and a lower plate, wherein at least part of each first torsion blade is located between the upper plate and the lower plate, and the plurality of first torsion blades are distributed in an array in the circumferential direction of the lower plate; each first torsion blade comprises a first head portion and a first tail portion, the first head portion being closer to the center of the impeller assembly than the first tail portion; and the curve that connects the first torsion blade and the upper plate is defined as a long upper edge curve, the curve that connects the first torsion blade and the lower plate is defined as a long lower edge curve, the intersection point of the long upper edge curve and the first head portion is a first point, and the intersection point of the long lower edge curve and the first head portion is a second point, the first point being located on a first circumference, the second point being located on a second circumference, the ratio of the diameter of the first circumference to the diameter of the second circumference being 1.3 to 1.7, and the ratio of the setting angle of the first point to the setting angle of the second point being 1.2 to 1.6. In this way, the area of the impeller inlet is increased, and the flow velocity at the impeller inlet is reduced, thereby reducing the local cavitation at the impeller inlet.

Description

Electric pump

[0001] This application claims priority to the following three Chinese patent applications, the entire contents of which are incorporated herein by reference:

[0002] 1. A method for manufacturing an electric pump, filed with the China Patent Office on September 30, 2024, application number 2024113894985, and entitled "Method for Manufacturing an Electric Pump and Electric Pump";

[0003] 2. An electric pump, filed with the China Patent Office on September 30, 2024, application number 2024113902318, and entitled "Electric Pump";

[0004] 3. A manufacturing mold for an electric pump, filed with the China Patent Office on September 30, 2024, application number 2024113892227, and entitled "Manufacturing Mold for an Electric Pump". TECHNICAL FIELD

[0005] The present application relates to the technical field of thermal management, and in particular to an electric pump for vehicles, energy storage, or commercial use. BACKGROUND

[0006] As an important power component in the automotive thermal management system, the electric pump has increasingly high requirements for heat dissipation and hydraulic efficiency as electric vehicle technology develops. The electric pump includes an impeller assembly. To improve the hydraulic efficiency of the electric pump, the blades of the impeller assembly are usually designed as three-dimensional curved surfaces, or so-called twisted blades. However, there is a problem of local cavitation at the inlet of the impeller. SUMMARY

[0007] The purpose of the present application is to provide an electric pump that helps to reduce the local cavitation phenomenon at the inlet of the impeller.

[0008] To achieve the above purpose, a technical solution of the present application is as follows: An electric pump includes an impeller assembly, the impeller assembly includes a plurality of first twisted blades, an upper plate, and a lower plate, at least part of the first twisted blades is located between the upper plate and the lower plate, the plurality of first twisted blades is arrayed along the circumference of the lower plate, the first twisted blade includes a first head and a first tail, the first head is closer to the center of the impeller assembly than the first tail, a curve connecting the first twisted blade and the upper plate is defined as a long upper edge curve, a curve connecting the first twisted blade and the lower plate is defined as a long lower edge curve, an intersection of the long upper edge curve and the first head is a first point, an intersection of the long lower edge curve and the first head is a second point, the first point is located on a first circle, the second point is located on a second circle, the ratio of the diameter of the first circle to the diameter of the second circle is 1.3 to 1.7, and the ratio of the setting angle of the first point to the setting angle of the second point is 1.2 to 1.6.

[0009] The ratio of the diameter of the first circle to the diameter of the second circle is 1.3 to 1.7, and the ratio of the installation angle of the first point to the installation angle of the second point is 1.2 to 1.6. For the twisting degree of the plurality of first twisted blades, it can be understood that the first circle where the first point is located, the second circle where the second point is located, the second point installation angle, and the second point installation angle are optimized and designed, which is beneficial to increase the area of the fluid passage starting end of the impeller, and it can be understood that the impeller inlet area is beneficial to reduce the flow velocity of the working medium flowing through the fluid passage starting end of the impeller, and further beneficial to reduce the local cavitation of the impeller inlet. BRIEF DESCRIPTION OF DRAWINGS

[0010] Fig. 1 is a perspective view of an electric pump according to an embodiment of the present application.

[0011] Fig. 2 is a structural view of the electric pump along the X-X section in Fig. 1.

[0012] Fig. 3 is a sectional view of a rotating assembly in Fig. 2.

[0013] Fig. 4 is an exploded structural view of the rotating assembly in Fig. 2.

[0014] Fig. 5 is a perspective view of a first part in one direction in Fig. 2.

[0015] Fig. 6 is a perspective view of the first part in another direction in Fig. 2.

[0016] Fig. 7 is a front view of the first part along the A direction in Fig. 6.

[0017] Fig. 8 is a sectional view of the first part along the B-B section in Fig. 5.

[0018] Fig. 9 is a perspective view of a second part in one direction in Fig. 2.

[0019] Fig. 10 is a front view of the second part along the Y direction in Fig. 9.

[0020] Fig. 11 is a front view of a first twisted blade and a second twisted blade in Fig. 2.

[0021] Fig. 12 is a perspective view of a pump cover in one direction in Fig. 2.

[0022] Fig. 13 is a structural view of a volute flow passage and an impeller assembly in Fig. 2 projected along a direction perpendicular to the axial direction of the electric pump.

[0023] Fig. 14 is a sectional view of VIII in Fig. 13.

[0024] Fig. 15 is a perspective view of a first injection mold for forming the first part in Fig. 3 in one direction.

[0025] Fig. 16 is a perspective view of the first injection mold of Fig. 15 with the front mold removed, in one orientation.

[0026] Fig. 17 is a perspective view of the front mold of the first injection mold of Fig. 15, in one orientation.

[0027] Fig. 18 is an elevation view of the first injection mold of Fig. 15, in one orientation.

[0028] Fig. 19 is a cross-sectional view of Fig. 15 along the C-C section line.

[0029] Fig. 20 is a view of the first injection mold of Fig. 15, in one orientation, along the first mold core portion.

[0030] Fig. 21 is a view of the first injection mold of Fig. 15, in one orientation, along the second mold core portion.

[0031] Fig. 22 is a perspective view of the manufacturing mold for the electric pump of Fig. 1, in one orientation.

[0032] Fig. 23 is a cross-sectional view of Fig. 22 along the D-D section line.

[0033] Fig. 24 is a perspective view of the flow channel plate portion of Fig. 22, in one orientation, assembled with the first mold core portion.

[0034] Fig. 25 is a perspective view of the support portion of Fig. 24, in one orientation, assembled with the first mold core portion.

[0035] Fig. 26 is a perspective view of the support portion of Fig. 25, in one orientation.

[0036] Fig. 27 is a cross-sectional view of Fig. 26 along the E-E section line.

[0037] Fig. 28 is a perspective view of the flow channel plate portion of Fig. 22, in one orientation, assembled with the front mold, the first mold core portion, and the weld groove core portion.

[0038] Fig. 29 is an enlarged view of the I portion of Fig. 28.

[0039] Fig. 30 is a perspective view of the flow channel plate portion of Fig. 22, in one orientation, assembled with the front mold (with the front mold base portion removed), the first mold core portion, and the weld groove core portion.

[0040] Fig. 31 is a perspective view of the mold body portion of Fig. 22, in one orientation, assembled with the guide portion, the rear mold, and the second mold core portion.

[0041] Fig. 32 is a perspective view of the guide portion of Fig. 31, in one orientation, assembled with the second mold core portion.

[0042] Fig. 33 is a cross-sectional view of Fig. 32 along the F-F section line.

[0043] In the drawings: 100 electric pump; 11 pump cover; 111 inlet; 112 outlet; 113 partition tongue; 12 stator assembly; 121 stator housing; 122 stator winding; 13 inner cavity; 131 rotor cavity; 132 impeller cavity; 1321 volute flow passage; 1321a inlet of volute flow passage; L1 width of inlet of volute flow passage; 1321b throat of volute flow passage; 14 rotating assembly; 141 rotor assembly; 1411 rotor; 1412 first bearing; 1413 second bearing; 1413a end surface; 1413b outer peripheral surface; 1414 outer peripheral surface; 142 impeller assembly; 142b first protruding portion; 142c first recessed portion; 142d second protruding portion; 142e second recessed portion; 1421 upper plate; 1421a second hole; 1422 lower plate; 1422a inner surface; 1422b outer surface; 1422c first sub-inner surface; 1422d second sub-inner surface; 1422e peripheral side surface; 1423 first twisted blade; 1423a first head; 1423b first tail; 1423c pressure surface; 1423d suction surface; 1423e top; 1423f root; 1423g long upper edge curve; 1423h long lower edge curve; 1424 second twisted blade; 1425 impeller inlet; 1426 impeller outlet; 1427 impeller fluid flow passage; 1424b second tail; 1424a second head; 1424c short upper edge curve; 1424d short lower edge curve; 1424e top of second twisted blade; 1425 impeller inlet; 1426 impeller outlet; L2 width of impeller outlet; 142b1 start of first protruding portion; 142b2 end of first protruding portion; 142d1 start of second protruding portion; 142d2 end of second protruding portion; 143 first assembly; 144 first part; 1441 first hole; 145 second part; 19 control board assembly; 103 first circumference; 102 second circumference; A first point; B second point; β1 angle of inclination of first point; β2 angle of inclination of second point; C third point; D fourth point; 104 third circumference; 105 fourth circumference; 106 fifth circumference; 107 sixth circumference; 20 first injection mold; 201 first mold core part; 2011 first forming part; 2012 second forming part; 202 second mold core part; 2021 mold core one part; 2022 mold core two part; 203 front mold; 2031 front mold one part; 2032 front mold two part; 204 back mold; 2041 forming one part; 2042 forming two part; 2043 forming three part; 200 manufacturing mold; 2023 limiting groove; 2033 front mold base part; 2033a second sliding groove; 2034 welding groove core part; 2035 mold forming part; 2035a guide groove; 2044 third sliding groove; 2045 back mold forming part; 2046 back mold base part; 205 runner plate part; 2051 support one part; 2052 runner plate base part; 2051a first sliding groove; 206 locking mold part; 207 feeding port plate part; 207a feeding port; 208 mold body part;209 guide; 209a vertical portion; 209b inclined portion; 101 first direction; 1002 second direction. DETAILED DESCRIPTION

[0044] The application will be further described below in conjunction with the drawings and specific technical solutions:

[0045] The electric pump in the following examples can provide flow power for the working medium of the automobile thermal management system, and the working medium can be water or an aqueous solution, such as an aqueous solution containing 50% ethylene glycol. Of course, the working medium can also be other substances.

[0046] Referring to Figs. 1-14, an electric pump 100 is provided, which comprises a pump cover 11, a stator assembly 12, a rotating assembly 14 and a shaft; the stator assembly 12 comprises a stator winding 122 and a stator housing 121, the stator winding 122 comprises a stator core, an insulation framework and a winding. The pump cover 11 is sealingly and fixedly connected with the stator assembly 12, it is to be noted that the sealing and fixed connection herein means that the working medium in the electric pump 100 will not leak to the outside of the electric pump 100 through the joint surface of the pump cover 11 and the stator assembly 12 when the electric pump 100 is working. The shaft is fixedly connected with the stator assembly 12. Specifically, the shaft is injection-molded with the stator housing 121, it can be understood that part of the shaft is embedded in the stator housing 121, the electric pump 100 has an inner cavity 13, the rotating assembly 14 is located in the inner cavity 13, the inner cavity 13 comprises a rotor cavity 131 and an impeller cavity 132, in a specific embodiment, the rotor cavity 131 and the impeller cavity 132 are communicated. The inner cavity 13 can have the working medium flow through, the rotating assembly 14 comprises a rotor assembly 141 and an impeller assembly 142, the rotor assembly 141 comprises a rotor 1411. At least part of the rotor assembly 141 is located in the rotor cavity 131, and the impeller assembly 142 is located in the impeller cavity 132. In a specific embodiment, the other end of the shaft is at least partially located in the rotor cavity 131, at least part of the rotating assembly 14 is sleeved on the outer periphery of the shaft, part of the shaft is fixed to the stator housing 121, and the rotating assembly 14 can rotate around the shaft. Of course, as another embodiment, the rotating assembly 14 and the shaft are fixedly connected, and the shaft rotates together with the rotating assembly 14. The electric pump 100 can further comprise a control board assembly 19, which is electrically connected with the stator assembly 12. As another embodiment, the electric pump 100 can not comprise the control board assembly 19, and the control board assembly 19 is integrated in an external structure, thus being conducive to the miniaturization design of the electric pump 100. In the present embodiment, the electric pump 100 comprises the control board assembly 19. The pump cover 11 has an inlet 111 and an outlet 112, the inlet 111 is used for the working medium to flow into the electric pump 100, and the outlet 112 is used for the working medium to flow out of the electric pump 100. When the electric pump 100 is working, the electric pump 100 is connected with an external power supply, the current of the stator winding 122 is controlled, and thus the excitation magnetic field generated by the stator winding 122 is controlled, the rotating assembly 14 rotates around the shaft under the action of the excitation magnetic field, so that the working medium entering the inner cavity 13 through the inlet 111 rotates together with the rotating assembly 14, the movement direction of the working medium is converted from the axial direction of the electric pump to the radial direction of the electric pump, and the working medium leaves the electric pump 100 through the outlet 112 under the action of the centrifugal force. It is to be noted that the axial direction of the electric pump 100 described above and below is the direction in which the shaft of the electric pump extends, the radial direction of the electric pump is the direction perpendicular to the axial direction of the electric pump, and the circumferential direction of the electric pump is the direction around the circumferential direction of the shaft of the electric pump.

[0047] As an important power component in the automotive thermal management system, the electric pump has higher and higher requirements for heat dissipation with the development of electric vehicle technology, and the hydraulic efficiency of the electric pump is also required. The electric pump includes an impeller assembly. In order to improve the hydraulic efficiency of the electric pump, the impeller assembly is usually designed as a three-dimensional curved surface, or called a twisted blade. A plurality of twisted blades, an upper plate and a lower plate define an impeller fluid passage, the impeller fluid passage includes an impeller inlet and an impeller outlet, the impeller inlet is located at one end of the impeller fluid passage, the impeller outlet is located at the other end of the impeller fluid passage, and the impeller inlet is close to the center of the impeller relative to the impeller outlet. At present, there is a problem of local cavitation at the impeller inlet. It should be noted that the long upper edge curve or the short upper edge curve described herein and in the following is a curve formed by the suction surface or the pressure surface of the twisted blade and the upper plate, and the long lower edge curve or the short lower edge curve is a curve formed by the suction surface or the pressure surface of the twisted blade and the lower plate. The blade angle is the angle between the tangent direction of a point on the twisted blade and the tangent direction of the circumference, which can be understood as the setting angle. It should be noted that in this application, the suction surface and the pressure surface are symmetrically distributed relative to the middle curve, and the "middle curve" herein is a curve in the middle of the suction surface and the pressure surface relative to the thickness direction of the twisted blade. The "middle curve" is a virtual curve shown for description only. The degree of twisting of the suction surface and the pressure surface is approximately the same. Here, "approximately" means that within the manufacturing error range, the degree of twisting of the suction surface and the pressure surface is allowed to vary within a certain range. For convenience of description, the long upper edge curve described below is the curve formed by the suction surface and the upper plate, and the long lower edge curve is the curve formed by the suction surface and the lower plate.

[0048] As an implementation manner, referring to FIGS. 1 to 14, an electric pump 100 includes a rotating assembly 14, the rotating assembly 14 includes an impeller assembly 142 and a rotor assembly 141, the rotor assembly 141 includes a rotor 1411, the impeller assembly 142 is formed by insert injection molding at least the rotor 1411, the impeller assembly 142 includes a plurality of first twisted blades 1423, a plurality of second twisted blades 1424, an upper plate 1421 and a lower plate 1422, the first twisted blades 1423 and the lower plate 1422 are an integral structure, the second twisted blades 1424 and the upper plate 1421 are an integral structure, the structure formed by the first twisted blades 1423 and the lower plate 1422 is defined as a first part 144, the structure formed by the second twisted blades 1424 and the upper plate 1421 is a second part 145, and the first part 144 and the second part 145 are welded and fixed. In this way, the assembly of the impeller assembly 142 can be completed by only one welding, which is beneficial to simplify the manufacturing steps of the electric pump 100 while improving the efficiency of the electric pump 100.

[0049] As a specific implementation, please refer to FIG. 1 to FIG. 10, the rotating assembly 14 includes a first bearing 1412 and a second bearing 1413, the first bearing 1412, the rotor 1411 are formed into a first assembly 143 by insert injection molding, the first assembly 143, the second bearing 1413 is injection molded into a first part 144, the first part 144 includes a first twisted blade 1423 and a lower plate 1422, the first twisted blade 1423 is injection molded with the lower plate 1422 and can be understood as an integral structure. The first part 144 includes a rotor assembly 141, and the first twisted blade 1423 of the impeller assembly 142 and the lower plate 1422 of the impeller assembly 142 are integral structure. In this way, the rotor assembly 141 and the first twisted blade 1423 of the impeller assembly 142 and the lower plate 1422 of the impeller assembly 142 are designed as an integral structure, which is beneficial to improve the structural strength of the rotating assembly 14. Specifically, the outer peripheral surface 1414 of the rotor assembly 141 extends to the lower plate 1422 along the axial direction of the electric pump 100. In this way, it is beneficial to simplify the injection mold for forming the rotor assembly 141.

[0050] As a specific implementation, please refer to FIG. 1 to FIG. 8, the first part 144 includes a first hole 1441, which extends from the inner surface 1422a to the outer surface 1422b in the direction parallel to the axial direction of the electric pump 100, and extends to the end surface 1413a of the second bearing 1413. It can be understood that the wall part corresponding to the first hole 1441 includes the end surface 1413a of the second bearing 1413. The radial dimension of the first hole 1441 is greater than the radial dimension of the outer peripheral surface 1413b of the second bearing 1413. It can be understood that the hole diameter of the first hole 1441 is greater than the diameter of the outer peripheral surface 1413b of the second bearing 1413. The first twisted blade 1423 includes a first head 1423a, a first tail 1423b, a pressure surface 1423c and a suction surface 1423d, a top 1423e and a root 1423f, the first head 1423a is close to the impeller inlet 1425, the first tail 1423b is close to the impeller outlet 1426, the root 1423f is injection molded with the lower plate 1422, and the top 1423e is welded with the upper plate 1421. Specifically, the suction surface is a concave curve, and the pressure surface is a convex curve.

[0051] The upper plate 1421 includes a second hole 1421a, a value of the second hole 1421a in the radial direction of the electric pump is greater than a value of the first hole 1441 in the radial direction of the electric pump, the top 1423e close to the first head 1423a extends to the wall part corresponding to the second hole 1421a and is attached to the wall part corresponding to the second hole 1421a, which is conducive to avoiding the reduction of the working medium entering the impeller flow passage 1427, and is conducive to improving the hydraulic efficiency of the electric pump 100. Part of the first head 1423a is located in the second hole 1421a, so that the fluid entering the impeller assembly 142 can enter the impeller flow passage body channel 1427 more smoothly, increase the inlet area, reduce the fluid inlet flow rate, can avoid cavitation, reduce vibration. Specifically, the first head 1423a is located in the second hole 1421a, the top 1423e close to the first head 1423a is attached to the wall part corresponding to the second hole 1421a, and the root 1423f close to the first head 1423a extends to the wall part corresponding to the first hole 1441.

[0052] As a specific implementation, please refer to FIG. 1 to FIG. 14, as a specific embodiment, the first twisted blade includes 4, the second twisted blade includes 4, the 4 second twisted blades and the 4 first twisted blades are staggered distributed along the circumferential direction of the electric pump, the second twisted blade divides the impeller flow passage into two parts, in this way, the processing and manufacturing of the first twisted blade and the second twisted blade are facilitated. FIG. 11 is a structure schematic diagram of the second twisted blade 1424 and the first twisted blade 1423 projected to the plane where the lower plate 1422 is located.

[0053] As an implementation, please refer to the drawings 1-14, an electric pump 100, the electric pump 100 includes an impeller assembly 142, the impeller assembly 142 includes a plurality of first twisted blades 1423, an upper plate 1421 and a lower plate 1422, at least part of the first twisted blades 1423 is located between the upper plate 1421 and the lower plate 1422, the plurality of first twisted blades 1423 is arranged along the circumference of the lower plate 1422, the first twisted blade 1423 includes a first head 1423a and a first tail 1423b, the first head 1423a is close to the center of the impeller assembly 142 relative to the first tail 1423b, the curve defined as the connection between the first twisted blade 1423 and the upper plate 1421 is the long upper edge curve 1423g, the curve defined as the connection between the first twisted blade 1423 and the lower plate 1422 is the long lower edge curve 1423h, the intersection point of the long upper edge curve 1423g and the first head 1423a is defined as the first point A, the intersection point of the long lower edge curve 1423h and the first head 1423a is defined as the second point B, the first point A is located on the first circumference 103, specifically, the second point B is located on the second circumference 103, the first circumference 103 and the second circumference 102 are concentric with the circumference of the circumferential surface 1422e of the lower plate 1422. The ratio of the diameter of the first circumference 103 to the diameter of the second circumference 102 is 1.3 to 1.7, and the ratio of the installation angle β1 of the first point A to the installation angle β1 of the second point B is 1.2 to 1.6. In this way, the first working medium enters the electric pump along the axial direction of the electric pump, and then flows out along the radial direction of the electric pump. When the working medium starts to change from the axial direction of the electric pump to the radial direction of the electric pump, the first head is beneficial to guide the flow of the working medium. The twist degree of at least the first head is optimized and designed. It can be understood that the optimization design of the first point on the first circumference, the second point on the second circumference, the second point installation angle and the second point installation angle is beneficial to increase the area of the flow through the impeller fluid passage starting end. It can be understood that the impeller inlet area is beneficial to reduce the flow rate of the working medium flowing through the impeller fluid passage starting end, and further beneficial to reduce the local cavitation of the impeller inlet. Second, in this way, while reducing cavitation, it is also beneficial to reduce vibration and noise of the water pump. In the present embodiment, only the blade angle of the intersection point of the long upper edge curve 1423g and the first tail 1423b is the same as the blade angle of the intersection point of the long lower edge curve 1423g and the first tail 1423b, and the blade angles of the long upper edge curve and the long lower edge curve except the above two points are different. In this way, it is beneficial to the manufacturing and processing of the impeller assembly. In the present embodiment, the installation angle β1 of the first point A is 35°-45°, and the diameter of the first circumference 102 is 16mm-20mm. In this way, the cavitation phenomenon at the impeller inlet is further reduced.

[0054] As an implementation, please refer to FIG. 1 to FIG. 14, the impeller assembly 142 includes a plurality of second twisted blades 1424, at least part of the second twisted blades 1424 are located between the upper plate 1421 and the lower plate 1422, the plurality of second twisted blades 1424 are arranged along the circumference of the upper plate 1421, the number of the first twisted blades 1423 and the second twisted blades 1424 are equal, specifically, the twist degree of the first twisted blades 1423 and the twist degree of the second twisted blades 1424 are consistent, it can be understood that under the same circumferential diameter, the first twisted blades 1423 and the second twisted blades 1424 have the same setting angle. In this way, it is beneficial to increase the area of the impeller fluid passage. It is beneficial to reduce the cavitation phenomenon in the impeller fluid passage, and in turn it is beneficial to improve the hydraulic efficiency of the electric pump. The second twisted blade 1424 is located between two adjacent first twisted blades 1423, the length of the second twisted blade 1424 is less than the length of the first twisted blade 1423, the second twisted blade 1424 includes a second head 1424a and a second tail 1424b, the second head 1424a is closer to the central part of the impeller assembly 142 than the second tail 1424b, the first head 1423a is closer to the central part of the impeller assembly 142 than the second head 1424a, the curve defined as the connection between the second twisted blade 1424 and the upper plate 1421 is the short upper edge curve 1424c, the curve defined as the connection between the second twisted blade 1424 and the lower plate 1422 is the short lower edge curve 1424d, at least part of the short upper edge curve 1424c is different from the short lower edge curve 1424d. In this way, the first head 1423a is closer to the central part of the impeller assembly 142 than the second head 1424a, the first head 1423a and the second head 1424a are staggered, compared with the setting of the first head and the second head at the same position close to the center of the impeller assembly, it is beneficial to increase the impeller inlet area, it is beneficial to reduce the risk of cavitation of the impeller inlet, and it is beneficial to improve the efficiency of the water pump. In the embodiment, the short upper edge curve is the curve formed by the connection between the suction surface of the second twisted blade and the upper plate, and the short lower edge curve is the curve formed by the connection between the suction surface of the second twisted blade and the lower plate. The suction surface of the second twisted blade is a concave curved surface, and the pressure surface of the second twisted blade is a convex curved surface. Only the blade angle of the intersection point of the short upper edge curve 1424c and the second tail 1424b is different from the blade angle of the intersection point of the short lower edge curve 1424d and the second tail 1424b, and the blade angles of the short upper edge curve and the short lower edge curve are different except the above two points, in this way, it is beneficial to the manufacturing and processing of the impeller assembly.

[0055] As an implementation, please refer to the drawings 1-14, define the intersection of the short upper edge curve 1424c and the second head 1424a as the third point C, the intersection of the short lower edge curve 1424d and the second head 1424a as the fourth point D, the third point C is located on the third circle 104, the fourth point D is located on the fourth circle 105, the third circle 104 and the fourth circle 105 are concentric with the circle where the side surface of the upper plate 1421 is located, the ratio of the diameter of the first circle 102 to the third circle 104 is 0.4-0.8, and the ratio of the second circle 102 to the fourth circle 105 is 0.3-0.6. In this way, it is beneficial to guide the working medium of the impeller fluid channel, and the working medium in the impeller fluid channel is set here to be divided, which is beneficial to reduce the vortex condition.

[0056] As an implementation, please refer to the drawings 1-14, the first twisted blade 1423, the upper plate 1421 and the lower plate 1422 form the impeller fluid channel 1427, define the impeller fluid channel 1427 close to the first head 1423a of the first twisted blade 1423 as the impeller inlet 1425 of the impeller fluid channel 1427, and the impeller fluid channel 1427 close to the first tail 1423b of the first twisted blade 1423 as the impeller outlet 1426 of the impeller fluid channel 1427, the area ratio of the impeller outlet 1426 to the impeller inlet 1425 is 1.5-2. In this way, while ensuring performance, it is beneficial to control the working medium flow rate in the impeller fluid channel 1427 within a reasonable range, which is beneficial to reduce cavitation. On the other hand, it is beneficial to reduce the noise of the electric pump.

[0057] As an implementation, please refer to the drawings 1-14, the electric pump 100 includes a pump cover 11, the electric pump 100 includes an impeller cavity 132, the wall part corresponding to the impeller cavity 132 is formed in the pump cover 11, the impeller assembly 142 is located in the impeller cavity 132, the impeller cavity 132 includes a volute flow passage 1321, along the radial outer side of the electric pump 100, the volute flow passage 1321 is located radially outside the impeller assembly 142, the ratio of the width L1 of the inlet 1321a of the volute flow passage 1321 to the width L2 of the impeller outlet 1426 is 2.4-3.2. In this way, it is beneficial to reduce the noise of the electric pump. It should be noted that the position of the inlet of the volute flow passage 1321 is the position where the maximum radial radius of the volute flow passage is located, for the convenience of describing the volute flow passage 1321, please refer to the drawings 12 and 13, the drawing 13 shows the projection of the impeller assembly and the volute flow passage in a plane perpendicular to the axial direction of the electric pump. In this embodiment, the width L1 of the volute inlet is 6-8mm. In this way, it is further beneficial to reduce the noise of the electric pump.

[0058] As an implementation, please refer to the figures 1 to 14, the volute flow passage 1321 includes the throat of the volute flow passage 1321b, along the flow direction of the working medium in the volute flow passage 1321, the throat of the volute flow passage 1321b is located downstream of the inlet 1321a of the volute flow passage, and the area ratio of the throat of the volute flow passage 1321b to the area of the impeller outlet 1426 is 0.18 to 0.3. In this way, first, it is beneficial to improve the efficiency of the large flow area; second, it is beneficial to reduce the noise of the electric pump. Specifically, the pump cover 11 includes a partition tongue 113, and the throat of the volute flow passage 1321b refers to the part of the volute flow passage perpendicular to the end of the partition tongue, which can be specifically referred to as shown in Figure 13. In the embodiment, the area of the throat of the volute flow passage 1321b is 95mm 2 to 102mm 2 . In this way, further, the efficiency of the large flow area is improved, and at the same time, it is further beneficial to reduce the noise of the electric pump.

[0059] As an implementation, please refer to the figures 1 to 14, the first twisted blade 1423 and the lower plate 1422 are an integral structure, the second twisted blade 1424 and the upper plate 1421 are an integral structure, the structure formed by the first twisted blade 1423 and the lower plate 1422 is defined as the first part 144, the structure formed by the second twisted blade 1424 and the upper plate 1421 is defined as the second part 145, and the first part 144 and the second part 145 are welded and fixed. In this way, it is beneficial to simplify the manufacturing steps of the electric pump.

[0060] Specifically, as an implementation, please refer to the figures 1 to 14, the impeller assembly 142 includes a first protruding part 142b and a first recessed part 142c, one of the first protruding part 142b and the first recessed part 142c is arranged on the first twisted blade 1423, and the other of the first protruding part 142b and the first recessed part 142c is arranged on the upper plate 1421. The molten part of at least the first protruding part 142b is located in the first recessed part 142c. In this way, the connection strength of the first part and the second part is guaranteed, and at the same time, it is beneficial to reduce the generation of welding overflow.

[0061] Specifically, as an implementation manner, referring to FIGS. 1-14, the first protruding part 142b and the first twisted blade 1423 are an integral structure, the first protruding part 142b is arranged close to the tail part 1423b of the first twisted blade 1423, the first protruding part 142b is arranged protruding along the top part 1423e of the first twisted blade 1423, the first protruding part 142b extends along the radial direction of the first twisted blade 1423, the first recessed part 142c is recessed in the upper plate 1421, and the top part 1423e of the first twisted blade 1423 is in contact with the upper plate 1421. In this way, the first protruding part 142b is arranged close to the first tail part 1423b of the first twisted blade 1423, the tail part 1423b of the first twisted blade 1423 is subjected to a greater external force than the first head part of the first twisted blade 1423, the first protruding part 142b only occupies part of the area of the top part of the first twisted blade 1423, and the first protruding part 142b does not need to extend the entire first twisted blade 1423. Thus, it is beneficial to reduce the amount of material used by the first protruding part 142b, lay a certain foundation for the lightweight of the electric pump, and reduce the use cost of the electric pump.

[0062] Specifically, as an implementation manner, referring to FIGS. 1-14, the impeller assembly 142 includes a second protruding part 142d and a second recessed part 142e, one of the second protruding part 142d and the second recessed part 142e is located at the second twisted blade 1424, the other of the second protruding part 142d and the second recessed part 142e is located at the lower plate 1422, and at least the molten part of the second protruding part 142d is located in the second recessed part 142e. Thus, it is beneficial to reduce the overflow of the welding of the first part and the second part into the working medium, and improve the cleanliness of the working medium.

[0063] Specifically, as an implementation manner, referring to FIGS. 1-14, the second protruding part 142d and the second twisted blade 1424 are an integral structure, the second protruding part 142d is arranged close to the second head part 1424a of the second twisted blade 1424, the second protruding part 142d is arranged protruding along the top part 1424e of the second twisted blade 1424, the second protruding part 142d extends along the radial direction of the second twisted blade 1424, the second protruding part 142d extends along the radial direction of the second twisted blade 1424, the second recessed part 142e is recessed in the lower plate 1422, and the top part 1424e of the second twisted blade 1424 is in contact with the lower plate 1422. In this way, it is beneficial to reduce the overflow of the welding of the first part and the second part into the working medium, and improve the cleanliness of the working medium. Specifically, the second protruding part 142d is arranged close to the head part of the second twisted blade 1424, the second recessed part 142e is recessed in the lower plate, and the second protruding part 142d extends along the radial direction of the second twisted blade 1424. In this way, it is beneficial to the processing and manufacturing of the electric pump.

[0064] Specifically, as an implementation, please refer to the first convex portion 142b includes the first convex portion of the start 142b1 and the first convex portion of the end 142b2, the first convex portion of the start 142b1 is close to the center of the impeller part relative to the first convex portion of the end 142b2, the second convex portion 142d includes the second convex portion of the start 142d1 and the second convex portion of the end 142d2, the second convex portion of the start 142d1 is close to the center of the impeller part relative to the second convex portion of the end 142d2, the circumference of the first convex portion of the start 142b1 is defined as the fifth circumference 106, the circumference of the second convex portion of the start 142d1 is defined as the sixth circumference 107, the diameter of the fifth circumference 106 is greater than the diameter of the sixth circumference 107. In this way, it is beneficial to ensure the welding strength of the first part and the second part.

[0065] As an implementation, please refer to the first convex portion 142b includes the first convex portion of the start 142b1 and the first convex portion of the end 142b2, the first convex portion of the start 142b1 is close to the center of the impeller part relative to the first convex portion of the end 142b2, the second convex portion 142d includes the second convex portion of the start 142d1 and the second convex portion of the end 142d2, the second convex portion of the start 142d1 is close to the center of the impeller part relative to the second convex portion of the end 142d2, the circumference of the first convex portion of the start 142b1 is defined as the fifth circumference 106, the circumference of the second convex portion of the start 142d1 is defined as the sixth circumference 107, the diameter of the fifth circumference 106 is greater than the diameter of the sixth circumference 107. In this way, it is beneficial to ensure the welding strength of the first part and the second part.

[0066] Need to explain, some of the above-mentioned circumference, is also for the purpose of making clear and supplementary virtual circumference.

[0067] Referring to FIGS. 1-21, the application also discloses a manufacturing method of the electric pump 100: at least taking the rotor 1411 as an insert to form a first part 144 including at least a plurality of first twisted blades 1423 and a lower plate 1422 by injection molding; wherein the first twisted blades 1423 and the lower plate 1422 are formed as an integral structure.

[0068] A second part 145 including at least a plurality of second twisted blades 1424 and an upper plate 1421 is formed by injection molding; wherein the second twisted blades 1424 and the upper plate 1421 are formed as an integral structure; and the first part 144 and the second part 145 are welded. In this way, the first twisted blades 1423 are formed on the first part 144, the second twisted blades 1424 are formed on the second part 145, and the first part 144 and the second part 145 are welded to form the impeller assembly 142. This structure only needs one welding to complete the assembly of the impeller assembly 142, which improves the efficiency of the electric pump 100 and simplifies the manufacturing steps of the electric pump 100.

[0069] As an implementation manner, at least taking the rotor 1411 as an insert to form a first part 144” including at least a plurality of first twisted blades 1423 and a lower plate 1422 by injection molding comprises:

[0070] The first mold core part 201 and the second mold core part 202 are used to define the pressure surface 1423c of the first twisted blade 1423 and the first sub-inner surface 1422c of the lower plate 1422; and the front mold 203 is used to define the suction surface 1423d of the first twisted blade 1423 and the second sub-inner surface 1422d of the lower plate 1422. In this way, the first part 144 formed by the injection molding mold 20 is machined by the combination of the first mold core part 201 and the second mold core part 202 to form the pressure surface 1423c and the first sub-inner surface 1422c of the lower plate 1422, which is beneficial to simplify the structure of the first injection molding mold 20.

[0071] The first injection mold 20 is used to form the first part 144, which will be described in detail below: please refer to FIGS. 1-21, the first injection mold 20 includes a front mold 203, a first mold core part 201, a second mold core part 202, and a rear mold 204; the second mold core part 202 is located above the rear mold 204, and the rear mold 204 is used to define the outer peripheral surface 1414 of the rotor assembly 141, the outer surface 1422b of the lower plate 1422, and the peripheral side surface 1422e of the lower plate 1422. Specifically, the rear mold 204 includes a forming part one 2041, a forming part two 2042, and a forming part three 2043, the forming part one 2041 is used to form the outer peripheral surface 1414 of the rotor assembly 141, the forming part two 2042 is used to form the outer surface 1422b of the lower plate 1422, and the forming part three 2043 is used to form the peripheral side surface 1422e of the lower plate 1422. In this way, it is beneficial to improve the structural strength of the rotating assembly 14. The front mold 203 is located above the rear mold 204, and the second mold core part 202 includes a plurality of second mold core parts 202 inserted between the front mold 203 and the rear mold 204 along the radial direction of the first injection mold 20, and the second mold core part 202 is used to define the second pressure surface 1423c of the first torsion blade 1423. Specifically, the second mold core part 202 includes a mold core part one 2021 used to define the second pressure surface 1423c of the first torsion blade 1423, and a mold core part two 2022 used to define part of the first inner surface 1422c. The front mold 203 is used to define the suction surface 1423d of the first torsion blade 1423 and the second inner surface 1422d of the lower plate 1422. Specifically, the front mold 203 includes a front mold part one 2031 used to define the suction surface 1423d of the first torsion blade 1423, and a front mold part two 2032 used to define the second inner surface 1422d of the lower plate 1422.

[0072] The number of the first mold core portion 201 matches the number of the first twisted vane 1423. The first mold core portion 201 is obliquely inserted into the front mold 203, and the first mold core portion 201 defines the first sub-pressure surface 1423p of the first twisted vane 1423 close to the first head portion 1423a. After the injection molding is completed, the first mold core portion 201 is moved out along a direction that is preset to be an acute angle with the axial direction of the electric pump 100. Specifically, the first mold core portion 201 includes a first forming portion 2011 and a second forming portion 2012. The first forming portion 2011 defines the first sub-pressure surface 1423p of the first twisted vane 1423 close to the first head portion 1423a. The second forming portion 2012 is used to define part of the first sub-internal surface 1422c of the lower plate 1422. In this way, it is beneficial to realize the miniaturization of the first injection mold 20. After the injection molding of the first portion 144 is completed, the first mold core portion 201 is first moved out along a direction that is preset to be an acute angle with the axial direction of the first injection mold 20. Then, the front mold 203 is separated from the rear mold 204, and the second mold core portion 202 is moved out along the radial direction of the first injection mold 20. The first portion 144 is separated from the rear mold 204. In this way, it is beneficial to facilitate the processing and manufacturing of the electric pump 100. It should be noted that the axial direction of the first injection mold 20 is parallel to the axial direction of the first portion 144, and the radial direction of the first injection mold 20 is perpendicular to the axial direction of the first injection mold 20.

[0073] Specifically, as an implementation manner, referring to FIGS. 1 to 21, the first mold core portion 201 defines the first pressure surface 1423c of the first twisted vane 1423 close to the head portion. After the injection molding is completed, the first mold core portion 201 is moved out along a direction that is preset to be an acute angle with the axial direction of the electric pump 100. Specifically, the included angle between the first mold core portion 201 and the axial direction of the electric pump is greater than 0° and less than or equal to 30°. In this way, it is beneficial to reduce the jamming of the first mold core portion 201 during the movement. The second mold core portion 202 defines the second pressure surface 1423c of the first twisted vane 1423, and is moved out along the radial direction of the injection mold after the injection molding is completed. After the first mold core portion 201 is moved out, the front mold 203 is moved away from the second mold core portion 202, and the second mold core portion 202 is moved out. The rear mold 204 is used to define the outer circumferential surface 1414 of the rotor assembly 141, the outer surface 1422b of the lower plate 1422, and the circumferential surface 1422e of the lower plate 1422. The blade angle of the long upper edge curve 1423g and the long lower edge curve 1423h of the blade portion of the first tail portion 1423b of the first twisted vane 1423 is the same. The blade angle of the long upper edge curve 1423g and the long lower edge curve 1423h of the blade portion of the first tail portion 1423b of the first twisted vane 1423 is not the same.

[0074] As an implementation manner, the first injection mold 20 is used to form the first portion 144, and the manufacturing method includes:

[0075] The first mold core part 201 and the second mold core part 202 are used to jointly define the pressure surface 1423c of the first twisted vane 1423 and the first sub-inner surface 1422c of the lower plate 1422. The front mold 203 is used to define the suction surface 1423d of the first twisted vane 1423 and the second sub-inner surface 1422d of the lower plate 1422. In this way, the first part 144 formed by the injection mold 20 is processed to form the pressure surface 1423c and the first sub-inner surface 1422c of the lower plate 1422 by the combination of the first mold core part 201 and the second mold core part 202, which is beneficial to simplify the structure of the first injection mold 20.

[0076] The first injection mold 20 will be described in detail below. Referring to FIGS. 1-21, the first injection mold 20 includes a front mold 203, a first mold core part 201, a second mold core part 202, and a rear mold 204. The second mold core part 202 is located above the rear mold 204, and the rear mold 204 is used to define the outer peripheral surface 1414 of the rotor assembly 141, the outer surface 1422b of the lower plate 1422, and the peripheral side surface 1422e of the lower plate 1422. Specifically, the rear mold 204 includes a forming part 2041, a forming part 2042, and a forming part 2043. The forming part 2041 is used to form the outer peripheral surface 1414 of the rotor assembly 141, the forming part 2042 is used to form the outer surface 1422b of the lower plate 1422, and the forming part 2043 is used to form the peripheral side surface 1422e of the lower plate 1422. In this way, it is beneficial to improve the structural strength of the rotating assembly 14. The front mold 203 is located above the rear mold 204, and the second mold core part 202 includes a plurality of second mold core parts 202 inserted between the front mold 203 and the rear mold 204 along the radial direction of the first injection mold 20, which can be understood as the second direction described below. The second mold core part 202 is used to define the second pressure surface 1423c of the first twisted vane 1423. Specifically, the second mold core part 202 includes a mold core part 2021 used to define the second pressure surface 1423c of the first twisted vane 1423, and a mold core part 2022 used to define part of the first sub-inner surface. The front mold 203 is used to define the suction surface 1423d of the first twisted vane 1423 and the second sub-inner surface 1422d of the lower plate 1422. Specifically, the front mold 203 includes a front mold part 2031 used to define the suction surface 1423d of the first twisted vane 1423 and a front mold part 2032 used to define the second sub-inner surface 1422d of the lower plate 1422.

[0077] The number of the first mold core portions 201 matches the number of the first twisted vanes 1423. The first mold core portions 201 are obliquely inserted into the front mold 203, and the first mold core portions 201 define the first sub-pressure surfaces 1423p of the first twisted vanes 1423 close to the first head portions 1423a. After the injection molding is completed, the first mold core portions 201 are moved out along a direction that is preset to be an acute angle with the axial direction of the electric pump 100. Specifically, the first mold core portions 201 include first forming portions 2011 and second forming portions 2012. The first forming portions 2011 define the first sub-pressure surfaces 1423p of the first twisted vanes 1423 close to the first head portions 1423a. The second forming portions 2012 are used to define part of the first sub-inner surfaces 1422c of the lower plates 1422. In this way, the first injection mold 20 is miniaturized along the radial direction of the first injection mold 20. After the first portion 144 is injection molded, the first mold core portions 201 are first moved out along a direction that intersects the axial direction of the first injection mold 20 at an acute angle. Then, the front mold 203 is separated from the rear mold 204, and the second mold core portions 202 are moved out along the radial direction of the first injection mold 20. The first portion 144 is separated from the rear mold 204. In this way, the processing and manufacturing of the electric pump 100 are facilitated. It should be noted that the axial direction of the first injection mold 20 is parallel to the axial direction of the first portion 144, and the radial direction of the first injection mold 20 is perpendicular to the axial direction of the first injection mold 20.

[0078] Specifically, as an implementation manner, referring to FIGS. 1 to 21, the first mold core portions 201 define the first pressure surfaces 1423c of the first twisted vanes 1423 close to the head portions. After the injection molding is completed, the first mold core portions 201 are moved out along a direction that is preset to be an acute angle with the axial direction of the electric pump 100. The second mold core portions 202 define the second pressure surfaces 1423c of the first twisted vanes 1423, and the second mold core portions 202 are moved out along the radial direction of the first injection mold after the injection molding is completed. After the first mold core portions 201 are moved out, the front mold 203 is moved away from the second mold core portions 202, and the second mold core portions 202 are moved out. The rear mold 204 is used to define the outer circumferential surface 1414 of the rotor assembly 141, the outer surface 1422b of the lower plate 1422, and the circumferential surface 1422e of the lower plate 1422. The blade portion of the first tail portion 1423b of the first twisted vane 1423 has the same blade angle of the long upper edge curve 1423g and the long lower edge curve 1423h. The blade portion of the first tail portion 1423b of the first twisted vane 1423 has different blade angles of the long upper edge curve 1423g and the long lower edge curve 1423h.

[0079] The inventor finds that the current manufacturing mold of the twisted vane is relatively complex, and the processing cycle is relatively long when the first portion is injection molded. Therefore, the inventor optimizes the injection mold, which is beneficial to reduce the processing cycle when the first portion is injection molded.

[0080] Referring to FIGS. 22-30, the application also discloses a manufacturing mold 200 of the electric pump 100, the manufacturing mold 200 comprising a first injection mold 20, the first injection mold 20 comprising a first mold core part 201 and a runner plate part 205, the first mold core part 201 being used to define the pressure surface of the partial first twisted blade 1423, the first mold core part 201 comprising a plurality of first mold core parts 201, at least two first mold core parts 201 of the plurality of first mold core parts 201 being in sliding connection with the runner plate part 205, defining a first direction 101 and a second direction 1002, the first direction 101 being parallel to the height direction of the manufacturing mold 200, the second direction 1002 being perpendicular to the first direction, the runner plate part 205 being capable of moving along the first direction 101, when the runner plate part 205 moves along the first direction 101, the runner plate part 205 can drive the at least two first mold core parts 201 to move along the first direction 101 and the second direction 1002 at the same time. In this way, the at least two first mold core parts 201 move in linkage with the movement of the runner plate part 205, compared with the way of core pulling of the plurality of first mold core parts 201 separately, this is conducive to reducing the beat of manufacturing the electric pump. It should be noted that the first direction 101 is the direction in which the front mold 203 and the back mold 204 are separated below. The "sliding connection" described above means that two objects are in contact but not fixed, and the two objects can slide relative to each other. In the embodiment, the first mold core part 201 comprises four, and the four first mold core parts 201 are all in sliding connection with the runner plate part 205. The first injection mold 20 comprises a feeding port plate part 207, along the first direction 101, the feeding port plate part 207 is away from the part to be injected (the first part 144) relative to the runner plate part 205, and the feeding port plate part 207 is provided with a feeding port 207a. After the front mold and the back mold are closed, the runner plate part close to the side surface of the support part also plays a limiting role on the first mold core part 201, which is conducive to reducing the displacement of the first mold core part during injection molding.

[0081] Specifically, as an implementation manner, referring to FIGS. 22-30, the flow channel plate part 205 includes a flow channel plate base 2052 and a support part 2051, the flow channel plate base 2052 is fixedly connected with the support part 2051, the support part 2051 includes a first sliding groove 2051a, one end of the first mold core part 201 is located in the first sliding groove 2051a, the length extension direction of the first sliding groove 2051a forms a preset angle with the first direction, specifically, the length extension direction of the first sliding groove 2051a forms a preset angle greater than 0° and less than or equal to 30° with the first direction 101. In this way, the movement of the first mold 201 in the first sliding groove 2051a is more smooth, and the situation of the first mold 201 being stuck is reduced. The mold core part 201 can move along the length extension direction of the first sliding groove 2051a, and the other end of the first mold core part 201 is used to define the pressure surface 1423c of the first twisted blade 1423 close to the first head part 1423a. In this way, only the first sliding groove 2051a needs to be arranged on the support part 2051, and the first mold core part 201 can be moved in the first direction 101 and the second direction 1002 at the same time, the structure of the first injection mold 20 is relatively simple, and the processing and manufacturing of the first injection mold 20 are facilitated.

[0082] Specifically, referring to FIGS. 22-30, the manufacturing mold 200 includes a front mold 203, along the height direction of the manufacturing mold 200, the front mold 203 is close to the to-be-injected workpiece relative to the flow channel plate part 205, and it can be understood that the to-be-injected workpiece here is the first part 144, the front mold 203 includes a front mold base 2033 and a welding groove core part 2034, the welding groove core part 2034 includes a plurality of, at least two welding groove core parts 2034 in the plurality of welding groove core parts 2034 are fixedly connected with the front mold base 2033, and the welding groove core part 2034 is used to define the second groove part 142e. In order to realize reliable connection of the first part 144 and the second part 145, the number of the second groove part 142e is a plurality, and the number of the welding groove core part 2034 matches the number of the second groove part 142e. In this way, when the front mold 203 and the rear mold 204 are demolded in the first direction 101, the welding groove core part 2034 can be separated from the second groove part 142e, and thus, compared with the design of separating the welding groove core part 2034 from the second groove part 142e, it is beneficial to further reduce the processing cycle of the manufacturing electric pump 100.

[0083] Specifically, as an implementation, please refer to the front mold 203 shown in FIG. 22 to FIG. 30, the front mold 203 includes a mold forming portion 2035, the mold forming portion 2035 is fixedly connected with the front mold base 2033, the mold forming portion 2035 is used for defining the suction surface 1423d of the first twisted blade 1423, the second sub-inner surface 1422d of the lower plate 1422, the mold forming portion 2035 includes a guide groove 2035a, the number of the guide groove 2035a matches the number of the welding groove core portion 2034, and part of the welding groove core portion 2034 is located in the guide groove 2035a. Since the mold forming portion 2035 is easy to wear, the mold forming portion 2035 is arranged separately from the front mold base 2033, which is beneficial to replace the worn mold forming portion 2035, thereby reducing the cost of manufacturing the electric pump.

[0084] Specifically, as an implementation, please refer to the manufacturing mold 200 shown in FIG. 22 to FIG. 33, the manufacturing mold 200 includes a rear mold 204 and a second mold core portion 202, the second mold core portion 202 includes a plurality of, the second mold core portion 202 defines the second sub-pressure surface 1424q of the first twisted blade 1423, at least two of the plurality of second mold core portions 202 are slidably connected with the rear mold 204, and the second mold core portion 202 can move along the second direction 1002 when the rear mold 204 moves along the first direction 101. In this way, the first, the processing cycle of manufacturing the electric pump is further reduced, and the second, only the rear mold 204 needs to be moved along the first direction 101, that is, the plurality of second mold core portions 202 can be linked to be demolded and separated from the first part 144. It can be understood that when designing the mold, only whether the first injection mold 20 has enough demolding space in the first direction 101 needs to be considered, so that the miniaturization of the first injection mold 20 in the second direction 1002 is facilitated.

[0085] Specifically, please refer to the rear mold 204 shown in FIG. 22 to FIG. 33, as an implementation, the rear mold base 2046 includes a third sliding groove 2044, the second sliding groove 2044 is arranged in the upper surface of the rear mold base 2046, the second sliding groove 2044 extends along the second direction 1002, and the second mold core portion 202 can move along the direction in which the second sliding groove 2044 extends. In this way, the structure of the first injection mold 20 is simplified.

[0086] As an implementation, please refer to FIG. 22 to FIG. 33, the manufacturing mold 200 includes a mold body part 208 and a guide part 209, the mold body part 208 is fixedly connected with the guide part 209, the guide part 209 includes a vertical part 209a and an inclined part 209b, the vertical part 209a is fixedly connected with the inclined part 209b or the vertical part 209a and the inclined part 209b are an integral structure, the second mold core part 202 includes a limiting groove 2023, and the inclined part 209b is located in the limiting groove 2023. It is beneficial to simplify the structure of the first injection mold 20. Specifically, the included angle between the extension direction of the inclined part 209b and the vertical part 209a is an acute angle. Specifically, the included angle between the extension direction of the inclined part 209b and the vertical part 209a is greater than 0° and less than or equal to 30°. It can be understood that the direction of the vertical part extension is parallel to the first direction, and the included angle between the direction opposite to the vertical part extension and the direction of the inclined part extension is greater than 0° and less than or equal to 30°. In this way, it is beneficial to reduce the situation that the second mold core part 202 is stuck during movement. When the back mold 204 moves along the first direction 101, the second mold core part 202 moves along the direction of the extension of the inclined part 209b, and the second mold core part 202 is separated from the second sub-pressure surface 1424q of the first part.

[0087] In the injection molding process, please refer to FIG. 22 to FIG. 33, in order to make the second mold core part 202 not move along the first direction 101, as an implementation, the manufacturing mold 200 includes a locking part 206, the locking part 206 is fixedly connected with the front mold 203, and at least part of the locking part 206 is located in the third sliding groove 2044 part.

[0088] As an implementation, please refer to FIG. 22 to FIG. 33, the back mold 204 includes a back mold forming part 2035, the back mold forming part 2035 is fixedly connected with the base of the back mold 204, and the back mold forming part 2035 is used to define the outer circumferential surface 1414 of the rotor assembly 141, the outer surface 1422b of the lower plate 1422 and the circumferential surface 1422e of the lower plate 1422.

[0089] Please refer to FIG. 22 to FIG. 33, when the flow channel plate part 205 moves along the first direction 101 after the first part is injection molded, the first mold core part 201 is driven to move along the first direction 101 and the second direction 1002 by the first sliding groove 2051a, so that the first mold core part 201 moves along a direction oblique to the first direction 101, the first mold core part 201 moves out of the direction away from the first part 144, the first mold core part 201 is separated from the first sub-pressure surface 1423p, the front film 203 moves upward along the first direction 101, and a plurality of welding groove core parts 2034 are simultaneously moved along the first direction 101 at the same time, the rear mold 204 moves along the first direction 101 under the action of an external force, and the second mold core part 202 is simultaneously driven to move along the second direction 1002 at the same time, so as to realize the separation of the second mold core part 202 and the first part 144. The flow channel plate part 205, the front film 203 and the rear mold 204 of the first injection mold 20 of the present application only move along the first direction 101, and the separation of the first mold core part 201, the second mold core part 202 and the first part 144 is completed. Therefore, in the second direction 101, the space required for the demolding of the first injection mold 20 does not need to be considered, so as to facilitate the installation of the first injection mold 20. It can be understood that the adaptability of the installation position of the first injection mold 20 is improved. For example, for a space with relatively small space in the second direction 1002, the first injection mold 20 can meet the installation requirements.

[0090] The above only expresses several technical solutions of the present application, and the description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the invention patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and controls can be made, which are within the protection scope of the present application.

Claims

1. An electric pump (100) characterized by: The electric pump (100) comprises an impeller assembly (142), the impeller assembly (142) comprises a plurality of first twisted blades (1423), an upper plate (1421) and a lower plate (1422), at least part of the first twisted blades (1423) are located between the upper plate (1421) and the lower plate (1422), a plurality of the first twisted blades (1423) are arranged along the circumference of the lower plate (1422), the first twisted blade (1423) comprises a first head (1423a) and a first tail (1423b), the first head (1423a) is close to the central part of the impeller assembly (142) relative to the first tail (1423b), the curve defining the connection between the first twisted blade (1423) and the upper plate (1421) is a long upper edge curve (1423g), the curve defining the connection between the first twisted blade (1423) and the lower plate (1422) is a long lower edge curve (1423h), the intersection of the long upper edge curve (1423g) and the first head (1423a) is a first point (A), the intersection of the long lower edge curve (1423h) and the first head (1423a) is a second point (B), the first point (A) is located on a first circle (103), the second point (B) is located on a second circle (102), the first circle (103) and the second circle (102) are concentric with the circle in which the circumferential side surface (1422e) of the lower plate (1422) is located, the ratio of the diameter of the first circle (102) to the diameter of the second circle (103) is 1.3 to 1.7, the ratio of the installation angle (β1) of the first point (A) to the installation angle (β1) of the second point (B) is 1.2 to 1.

6.

2. The electric pump (100) according to claim 1, characterized in that: The impeller assembly (142) comprises a plurality of second twisted blades (1424), at least part of the second twisted blades (1424) are located between the upper plate (1421) and the lower plate (1422), a plurality of the second twisted blades (1424) are arranged along the circumference of the upper plate (1421), the second twisted blades (1424) are located between two adjacent first twisted blades (1423), the length of the second twisted blades (1424) is less than the length of the first twisted blades (1423), the second twisted blades (1424) comprise a second head (1424a) and a second tail (1424b), the second head (1424a) is closer to the central part of the impeller assembly (142) than the second tail (1424b), the first head (1423a) is closer to the central part of the impeller assembly (142) than the second head (1424a), the curve connecting the second twisted blades (1424) and the upper plate (1421) is defined as a short upper edge curve (1424c), the curve connecting the second twisted blades (1424) and the lower plate (1422) is defined as a short lower edge curve (1424d), the blade angle of at least part of the short upper edge curve (1424c) is different from the blade angle of at least part of the short lower edge curve (1424d).

3. The electric pump (100) according to claim 2, characterized in that: The intersection of the short upper edge curve (1424c) and the second head (1424a) is defined as a third point (C), the intersection of the short lower edge curve (1424d) and the second head (1424a) is defined as a fourth point (D), the third point (C) is located on a third circle (104), the fourth point (D) is located on a fourth circle (105), the ratio of the diameter of the third circle (104) to the diameter of the first circle (103) is 0.4 to 0.

8.

4. The electric pump (100) according to any one of claims 1 to 3, characterized in that: The first twisted blades (1423), the upper plate (1421) and the lower plate (1422) form the impeller fluid channel (1427), the impeller fluid channel (1427) close to the first head (1423a) of the first twisted blade (1423) is defined as the impeller inlet (1425) of the impeller fluid channel (1427), the impeller fluid channel (1427) close to the first tail (1423b) of the first twisted blade (1423) is defined as the impeller outlet (1426) of the impeller fluid channel (1427), the area ratio of the impeller outlet (1426) to the impeller inlet (1425) is 1.5 to 2.

5. The electric pump (100) according to any one of claims 1 to 3, characterized in that: The electric pump (100) comprises a pump cover (11), the electric pump (100) comprises an impeller cavity (132), a wall part corresponding to the impeller cavity (132) is formed in the pump cover (11), the impeller assembly (142) is located in the impeller cavity (132), the impeller cavity (132) comprises a volute flow channel (1321), the volute flow channel (1321) is located radially outward of the impeller assembly (142) along the radial direction of the electric pump (100), and the ratio of the width (L1) of the inlet (1321a) of the volute flow channel (1321) to the width (L2) of the impeller outlet (1426) is 2.4-3.

2.

6. The electric pump (100) according to claim 5, characterized in that: The volute flow channel (1321) comprises a volute flow channel throat (1321b), which is located downstream of the inlet (1321a) of the volute flow channel along the flow direction of the working medium in the volute flow channel (1321), and the ratio of the area of the volute flow channel throat (1321b) to the area of the impeller outlet (1426) is 0.18-0.

3.

7. The electric pump (100) according to any one of claims 1 to 6, characterized in that The first twisted blade (1423) and the lower plate (1422) are an integral structure, the second twisted blade (1424) and the upper plate (1421) are an integral structure, the structure formed by the first twisted blade (1423) and the lower plate (1422) is defined as a first part (144), the structure formed by the second twisted blade (1424) and the upper plate (1421) is defined as a second part (145), and the first part (144) and the second part (145) are welded and fixed.

8. The electric pump (100) according to claim 7, characterized in that: The impeller assembly (142) comprises a first protruding part (142b) and a first recessed part (142c), one of the first protruding part (142b) and the first recessed part (142c) is arranged on the first twisted blade (1423), and the other of the first protruding part (142b) and the first recessed part (142c) is arranged on the upper plate (1421), and at least the molten part of the first protruding part (142b) is located in the first recessed part (142c).

9. The electric pump (100) according to claim 8, characterized in that The first protruding part (142b) and the first twisted blade (1423) are an integral structure, the first protruding part (142b) is arranged close to the first tail part (1423b) of the first twisted blade (1423), the first protruding part (142b) is arranged protruding along the top part (1423e) of the first twisted blade (1423), the first protruding part (142b) extends along the direction in which the first twisted blade (1423) extends radially, and the first recessed part (142c) is recessed in the upper plate (1421), and the top part (1423e) of the first twisted blade (1423) is in contact with the upper plate (1421).

10. The electric pump (100) according to claim 8 or 9, characterized in that The impeller assembly (142) comprises a second protruding part (142d) and a second recessed part (142e), one of the second protruding part (142d) and the second recessed part (142e) is located at the second twisted blade (1424), the other of the second protruding part (142d) and the second recessed part (142e) is located at the lower plate (1422), and at least the molten part of the second protruding part (142d) is located in the second recessed part (142e).

11. The electric pump (100) according to claim 10, characterized in that The second protruding part (142d) and the second twisted blade (1424) are an integral structure, the second protruding part (142d) is arranged close to the second head (1424a) of the second twisted blade (1424), the second protruding part (142d) is arranged protruding along the top (1424e) of the second twisted blade (1424), the second protruding part (142d) extends along the radial direction of the second twisted blade (1424), the second protruding part (142d) extends along the direction of the radial extension of the second twisted blade (1424), and the second recessed part (142e) is recessed in the lower plate (1422). The top (1424e) of the second twisted blade (1424) is in contact with the lower plate (1422).

12. The electric pump (100) according to claim 11, characterized in that The first protruding part (142b) comprises a first protruding part start (142b1) and a first protruding part end (142b2), the first protruding part start (142b1) is closer to the center of the impeller than the first protruding part end (142b2), the second protruding part (142d) comprises a second protruding part start (142d1) and a second protruding part end (142d2), the second protruding part start (142d1) is closer to the center of the impeller than the second protruding part end (142d2), a circumference where the first protruding part start (142b1) is located is defined as a fifth circumference (106), a circumference where the second protruding part start (142d1) is located is defined as a sixth circumference (107), and the diameter of the fifth circumference (106) is greater than the diameter of the sixth circumference (107).

13. A manufacturing method of an electric pump (100), characterized in that: at least a first part (144) comprising a plurality of first twisted blades (1423) and a lower plate (1422) is formed by insert injection molding at least with a rotor (1411), wherein the first twisted blades (1423) and the lower plate (1422) are formed as an integral structure; at least a second part (145) comprising a plurality of second twisted blades (1424) and an upper plate (1421) is formed by injection molding, wherein the second twisted blades (1424) and the upper plate (1421) are formed as an integral structure; the first part (144) and the second part (145) are welded.

14. The manufacturing method of an electric pump according to claim 13, characterized by, "at least a first part (144) comprising a plurality of first twisted blades (1423) and a lower plate (1422) is formed by insert injection molding at least with a rotor (1411)" comprises: The first mold core part (201) and the second mold core part (202) are used to define the pressure surface (1423c) of the first twisted blade (1423) and the first sub-inner surface (1422c) of the lower plate (1422); The front mold (203) is used to define the suction surface (1423d) of the first twisted blade (1423) and the second sub-inner surface (1422d) of the lower plate (1422).

15. A manufacturing mold (200) of an electric pump (100), characterized by: The manufacturing mold (200) comprises a first injection mold (20), and the first injection mold (20) comprises a first mold core part (201) and a runner plate part (205). The first mold core part (201) is used to define the pressure surface (1423c) of the first twisted blade (1423), and the first mold core part (201) comprises a plurality of first mold core parts (201). At least two first mold core parts (201) of the plurality of first mold core parts (201) are slidably connected with the runner plate part (205). A first direction (101) and a second direction (1002) are defined. The first direction (101) is parallel to the height direction of the manufacturing mold (200), and the second direction (1002) is perpendicular to the first direction (101). The runner plate part (205) is capable of moving along the first direction (101). When the runner plate part (205) moves along the first direction (101), the runner plate part (205) can drive at least two first mold core parts (201) to move along the first direction (101) and the second direction (1002) simultaneously.

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