CN106321506B

CN106321506B - Rotor assembly and electric drive pump

Info

Publication number: CN106321506B
Application number: CN201510399082.6A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Automotive Components Co Ltd
Current assignee: Zhejiang Sanhua Automotive Components Co Ltd
Priority date: 2015-07-06
Filing date: 2015-07-06
Publication date: 2020-06-23
Anticipated expiration: 2035-07-06
Also published as: CN106321506A

Abstract

A rotor assembly comprises a first part and a second part, wherein the first part is integrally formed by injection molding and comprises an upper impeller cover plate and blades, the upper cover plate and the blades are integrally formed by injection molding, an impeller inlet is formed in the upper cover plate, and a first connecting structure is formed in the blades; the second part is integrative to be moulded plastics and is formed, and the second part includes apron, rotor permanent magnet and axle sleeve under the impeller, the second part with the rotor permanent magnet is the inserts and forms through moulding plastics, apron and axle sleeve under the layer of moulding plastics, and first portion and second part are through first connecting portion and second connecting portion welded fastening, and the manufacturing cost of rotor subassembly reduces like this, simultaneously integrated into one piece axle sleeve, and forming process is simple.

Description

Rotor assembly and electric drive pump

[ technical field ] A method for producing a semiconductor device

The present invention relates to a rotor assembly, particularly for use in an electrically driven pump.

[ background of the invention ]

In recent decades, electrically driven pumps have gradually replaced conventional mechanical pumps and are used in large numbers in heat cycle systems. The electrically driven pump has the advantages of no electromagnetic interference, high efficiency, environmental protection, stepless speed regulation and the like, and can well meet the market requirements.

The electric drive pump comprises a rotor assembly and a stator assembly, and the rotor assembly and the stator assembly are completely isolated by an isolation sleeve, so that the problem of liquid leakage of the traditional motor type brushless direct current water pump is solved; at present, the rotor assembly comprises an impeller and a rotor, the rotor assembly is generally formed by integral injection molding, namely the impeller and the rotor are made of the same material, the rotor is magnetized, the impeller is not magnetized, magnetic materials are wasted, the manufacturing cost is high, and meanwhile, the magnetic materials are brittle, so that the impeller is poor in toughness and easy to damage.

Therefore, there is a need for improvement of the prior art to solve the above technical problems.

[ summary of the invention ]

The invention aims to provide a rotor assembly, which can reduce the production cost.

In order to achieve the purpose, the invention adopts the following technical scheme: a rotor assembly, the rotor assembly includes the first part and the second part, the first part and the second part are separately processed, the first part is integrally injection molded, the first part includes the upper cover plate, the blade, the upper cover plate and the blade are integrally injection molded, the upper cover plate is formed with the blade inlet, the blade is formed with the first connection part towards the second part; the second part is injection moulding, the second part includes apron, rotor permanent magnet and axle sleeve down, the second part with the rotor permanent magnet is the inserts and forms through moulding plastics, and the layer of moulding plastics includes apron down with the axle sleeve, the apron orientation down the first part is provided with the second connecting portion, the first part with the second part passes through first connecting portion with second connecting portion welded fastening.

The first connecting part comprises a convex block and a convex strip which are arranged at the bottom of the blade and protrude towards the lower cover plate, the height of the convex strip is smaller than that of the convex block, and the height of the convex block is smaller than or equal to the thickness of the rear cover plate; the second connecting part comprises a groove arranged on the upper surface of the rear cover plate, stripe protrusions are arranged in the groove, small holes penetrating through the rear cover plate are formed in the groove, and the protrusion blocks are inserted into the small holes of the rear cover plate.

The permanent magnet is oriented in a polar anisotropy manner, N poles and S poles of the permanent magnet alternately appear in the circumferential direction, and the positions of the N poles and the S poles are magnetic concentration regions of the permanent magnet; the permanent magnet is annular and comprises an inner peripheral surface and an outer peripheral surface, the inner peripheral surface is cylindrical, the outer peripheral surface comprises a plane and a cylindrical surface, the plane and the cylindrical surface are uniformly distributed at intervals, the cylindrical surface comprises the magnetic concentration areas of the permanent magnet, and the plane is arranged between the adjacent magnetic concentration areas.

The plane is rectangular, the height of the long side of the plane is the same as that of the permanent magnet, and the short side of the plane is one third of the arc length of the cylindrical surface.

The permanent magnet comprises a first end face and a second end face, the first end face and the second end face are arranged in parallel, the first end face and the second end face are all perpendicular to the outer peripheral face, a first protruding block is arranged on the first end face, a second protruding block is arranged on the second end face, the injection molding layer covers the first end face and the second end face, the first protruding portion and the top of the second form the thickness of the injection molding layer is smaller than the thickness of the injection molding layer formed by the first end face and the second end face.

The first convex blocks and the second convex blocks are different in shape, the first convex blocks and the second convex blocks correspond to the magnetic concentration areas of the permanent magnets, and the number of the first convex blocks and the number of the second convex blocks are the same as the total number of the N poles and the S poles of the permanent magnets.

The shaft sleeve is formed by the injection molding layer and comprises an upper part, a middle part and a lower part, the upper part of the shaft sleeve and the lower cover plate are integrally injection molded, and the tail end of the upper part of the shaft sleeve is flush with the top of the cambered surface of the upper side surface of the lower cover plate; the lower part of axle sleeve set up with between permanent magnet up end and the lower terminal surface, the middle part of axle sleeve is connected the downside of apron down with the up end of permanent magnet.

The inner surface of the shaft sleeve is provided with at least two grooves which are uniformly distributed along the inner surface of the shaft sleeve, the grooves penetrate through the upper surface and the lower surface of the shaft sleeve and are communicated with the inner hole of the shaft sleeve, and the tail end of the upper part of the shaft sleeve is provided with an extending part with the grooves.

A gap with a certain distance is formed between the outer surface of the shaft sleeve and the permanent magnet, and the outer surface of the shaft sleeve is connected with the permanent magnet through a connecting rib.

The utility model provides an electric drive pump, electric drive pump includes pump shaft, rotor subassembly, stator module, the rotor subassembly is closer to than stator module the pump shaft sets up, the pump shaft is fixed to be set up, the rotor subassembly rotates around the pump shaft, the rotor subassembly be above the rotor subassembly.

Compared with the prior art, the rotor assembly comprises the first part and the second part, the upper cover plate and the blades of the first part are integrally formed in an injection molding mode, the second part takes the permanent magnet as an insert to form the lower cover plate in an injection molding mode, and the two parts are fixed through welding, so that the materials of the first part and the second part can be different, the cost can be reduced, meanwhile, the shaft sleeve is integrally formed, other inserts are not needed, and the processing technology can be simplified.

[ description of the drawings ]

FIG. 1 is a schematic cross-sectional view of an electrically driven pump according to an embodiment of the present invention;

FIG. 2 is an exploded schematic view of the rotor assembly of FIG. 1;

FIG. 3 is a perspective view of the rotor assembly shown in FIG. 1;

FIG. 4 is a schematic front view of the bottom surface of the rotor assembly of FIG. 2;

FIG. 5 is a cross-sectional structural view of the rotor assembly shown in FIG. 2;

FIG. 6 is a schematic front view of the first portion of FIG. 2;

FIG. 7 is a perspective view of the second portion of FIG. 2;

FIG. 8 is a schematic front view of the top surface of the second portion of FIG. 8;

FIG. 9 is a perspective view of the permanent magnet of FIG. 2;

FIG. 10 is a schematic front view of the second end face of FIG. 9;

FIG. 11 is a schematic cross-sectional view of the permanent magnet of FIG. 9;

fig. 12 is a schematic front view of the first end face shown in fig. 9, and illustrates the distribution of magnetic lines;

fig. 13 is an exploded view of the motor housing and heat sink assembly of fig. 1;

fig. 14 is a top view of the motor housing and heat sink assembly of fig. 13;

fig. 15 is a bottom view of the motor housing and heat sink assembly of fig. 13;

FIG. 16 is a schematic view of the cross-sectional A-A configuration of FIG. 14;

FIG. 17 is a perspective view of the heat sink of FIG. 13;

fig. 18 is a perspective view of the second metal plate of the heat conduction portion shown in fig. 13;

fig. 19 is a schematic sectional view of the second metal plate of the heat conduction portion shown in fig. 18.

[ detailed description ] embodiments

The invention will be further described with reference to the following figures and specific examples:

fig. 1 is a schematic structural diagram of an electrically driven pump 100, wherein the electrically driven pump 100 includes an impeller cavity cover 10, a spacer sleeve 20, a motor housing 30, a pump shaft 40, a rotor assembly 50, a stator assembly 60, an electric control board 70, and a heat dissipation assembly 80; the pump inner cavity comprises a space between the impeller cavity cover 10 and the motor shell 30, the separation sleeve 20 separates the pump inner cavity into a circulation cavity 91 and an accommodating cavity 92, working media can flow through the circulation cavity 91, the rotor assembly 50 is arranged in the circulation cavity 91, no working media pass through the accommodating cavity 92, and the stator assembly 60 and the electric control plate 70 are arranged in the accommodating cavity 92; the pump shaft 40 and the isolation sleeve 20 are fixed in an injection molding mode, the rotor assembly 50 can rotate around the pump shaft 40, the rotor assembly 50 and the stator assembly 60 are separated through the isolation sleeve 20, the stator assembly 60 is electrically connected with the electric control board 70, the electric control board 70 is connected with an external circuit through a plug connector, the heat dissipation assembly 80 is used for transferring heat of the electric control board 70 and dissipating heat, and the heat dissipation assembly 80 and the motor shell 30 are fixedly installed. In this example, the electric drive pump 100 is an inner rotor type electric drive pump, which means that the rotor assembly 50 is disposed closer to the pump shaft 40 than the stator assembly 60 with the pump shaft 40 as a central axis. In this embodiment, the pump shaft 40 is fixed relative to the spacer 20, and the rotor assembly 50 is rotatable relative to the pump shaft 40; of course, the pump shaft 40 can also rotate relative to the spacer sleeve 20 via a shaft sleeve, and the rotor assembly 50 is fixed relative to the pump shaft 40 and rotates with the pump shaft 40.

Fig. 2 to 9 are schematic structural views of the rotor assembly 50, and referring to fig. 2, the rotor assembly 50 includes two-part injection molded parts, namely a first part 51 and a second part 52, and the first part 51 and the second part 52 are fixed by welding; the first part 51 comprises an upper cover plate 11 and a blade 12, and the first part 51 is integrally injection-molded, wherein in one embodiment, the injection-molded material is a mixture comprising polyphenylene sulfide plastic (PPS plastic for short) and glass fiber; the second part 52 comprises a permanent magnet 21 and a lower cover plate 13, the second part 52 is formed by injection molding of a mixed material containing PPS plastic and carbon fibers by taking the permanent magnet 21 as an injection molding insert, and the injection molding material can also be other thermoplastic materials with relatively good mechanical properties; referring to fig. 3, the rotor assembly 50 functionally includes an impeller 1 and a rotor 2, the impeller 1 including an upper cover plate 11, blades 12, and a lower cover plate 13, the rotor 2 including permanent magnets 21; in this embodiment, the permanent magnet 21 is substantially in a ring structure, and the permanent magnet 21 is formed by injection molding, but the rotor 2 may have other structural forms; in the present embodiment, the impeller 1 except the upper cover plate is molded integrally with the permanent magnet 21 and is used for the electrically driven pump, but the impeller 1 may be formed separately and used for other centrifugal pumps, not limited to the electrically driven pump, and not limited to the rotor 2.

Referring to fig. 3, the impeller 1 is a substantially closed structure having an impeller inlet 15 and a plurality of outlets 14, the impeller 1 includes an impeller inlet 15, an upper cover plate 11, blades 12, a lower cover plate 13, and impeller outlets 14, the blades 12 are disposed between the upper cover plate 11 and the lower cover plate 13, the upper cover plate 11 is formed with the impeller inlet 15, the plurality of impeller outlets 14 are formed between the upper cover plate 11 and the lower cover plate 13 and at an outer edge of the upper cover plate 11 of adjacent blades 12, a plurality of impeller channels are formed between adjacent blades 12, the impeller channels communicate with the impeller inlet 15 and one of the impeller outlets 14, and upper and lower sides of the impeller channels are closed by the upper cover plate 11, the lower cover plate 13 and blade sidewalls at both sides of the impeller channels.

Referring to fig. 3, 5 and 6, the upper cover plate 11 is substantially circular, the upper cover plate 11 includes a planar portion 111 and an arc portion 112, the planar portion 111 includes an upper plane 1111 and a lower plane 1112, the arc portion 112 includes a first arc portion 1121 and a second arc portion 1122, the first arc portion 1121 is connected to and smoothly transits the upper plane 1111, the second arc portion 1122 is connected to and smoothly transits the lower plane 1112, and the arc portion 112 surrounds and forms the impeller inlet 15; the blades 12 are fixed with the lower plane 1112 of the upper cover plate 11 or with the lower plane 1112 and the second arc-shaped surface 1122 by injection molding; referring to fig. 3, at the side wall of the impeller eye 15, the impeller 1 comprises a vertical portion 113 tangential to the side wall of the impeller eye 15, the substantially vertical portion 113 being part of the connection of the upper cover plate 11 with the blades 12, which facilitates demoulding of the first portion 51 of the impeller 1. In this embodiment, the plane portion 111 has a certain angle with the horizontal plane, and the blades 12 are substantially perpendicular to the horizontal plane; the outer edge of the upper cover plate 11 is approximately a first circumference with the diameter phi 1, and the diameter of the impeller is equal to the diameter of the first circumference and also equal to the outer diameter of a virtual circle formed by the tail parts of the outer edges of the blades 12.

Referring to fig. 2 and 6, the blade 12 includes a long blade 121 and a short blade 122, the long blade 121 is in an arc shape, the short blade 122 is also in an arc shape, the arc length of the long blade 121 is greater than the arc length of the short blade 122, the long blade 121 is distributed at equal intervals along the circumference of the impeller 1, the short blade 122 is distributed at equal intervals along the circumference of the impeller 1, the number of the long blade 121 and the number of the short blade 122 are the same, the long blade 121 and the short blade 122 are distributed at intervals along the circumference of the impeller 2, that is, the short blade 122 is disposed between adjacent long blades 121, and the long blade 121 and the short blade 122 may be an arc or a combination of a plurality.

Referring to fig. 6, the long blade 121, the lower plane 1112 and the second arc-shaped surface 1122 of the upper cover plate 11 are of an injection-molded integral structure, the long blade 121 is divided into a first section 3 injection-molded and fixed with the second arc-shaped surface 1122 and a second section 4 injection-molded and fixed with the lower plane 1112, the first section 3 includes a head portion 31, a first bottom portion 32, a first concave surface 33 and a first convex surface 34, and the second section 4 includes a second bottom portion 42, a second concave surface 43, a second convex surface 44 and a tail portion 45; the head part 31 is arranged to extend into the impeller inlet 14, the head part 31 is the starting end of the long blade 121, the tail part 45 is the terminating end of the long blade 121, and the arc length between the head part 31 and the tail part 45 is the length of the long blade 121, in this embodiment, the first concave surface 33 and the second concave surface 43 form a first side surface of the long blade 121, the first convex surface 34 and the second convex surface 44 form a second side surface of the long blade 121, the head part 31 is the first head part of the long blade 121, and the tail part 45 is the first tail part of the long blade 121; on the first circumference, a first circular arc with the length of L1 is arranged between the intersection points of the second concave surfaces 43 of the adjacent long blades 121 and the first circumference, and the length of the first circular arc L1 is equal to the length of an arc which divides the first circumference into equal parts of the number of the long blades 121; the number of the long blades 121 in this embodiment is 5, and the length L1 of the first circular arc is equal to a length dividing the circumference of the first circumference into five equal parts.

Referring to fig. 2, the portion where the head 31 is located is a flow guide portion of the long blade 121, the working medium enters the impeller through the impeller inlet 14, the working medium is introduced into the flow channel of the adjacent long blade 121 through the head 31, the head 31 is fixed to the inner side wall of the impeller inlet 14 by injection molding, the first section 3 further includes a connecting surface 1216, the connecting surface 1216 is disposed between the head 31 and the first concave surface 33, the distance from the connecting surface 1216 to the first convex surface 34 is smaller than the distance from the first concave surface 33 to the first convex surface 34, so that the connecting surface 1216 makes the thickness of the section of the long blade 121 thinner, the gap between the head 31 and the long blade 121 at the position where the connecting surface 1216 is cut off can be increased, the flow resistance to the working medium can be reduced, and the flow of.

Referring to fig. 2 and 3, the head 31 extends into the impeller inlet 15, a straight line is drawn by a fixing point 311 of the long blade 121 and the side wall of the impeller inlet 15 in parallel with the center line of the side wall of the impeller inlet 15, an included angle between the head 31 and the straight line is approximately a forward inclination angle θ 3, the forward inclination angle θ 3 ranges from 20 ° to 50 °, the free end of the head 31 inclines from 20 ° to 50 ° toward the central axis direction of the impeller inlet 14, and thus the part where the head 31 is located can better restrict the flow of the working medium.

The thickness of the long blade 121 is represented by ε 1, where ε 1 is the vertical distance between the first side and the second side of the long blade 121; in the embodiment, the material of the injection molding blade has certain brittleness, and the long blade 121 is likely to be damaged, broken or damaged due to the thinness of the material, so the thickness epsilon 1 of the long blade is relatively large, and in the embodiment, the thickness epsilon 1 of the long blade is approximately 0.8mm to 2 mm; in this embodiment, the first side surface and the second side surface have a small draft angle for easy mold release, but since the draft angle is very small, the height of the corresponding blade with respect to the first side surface and the second side surface is negligible.

Referring to fig. 6, on the first circumference, at the intersection point of the second concave surface 43 of the long blade 121 and the first circumference, the included angle between the tangent of the second concave surface 43 and the tangent of the first circumference at the intersection point is the outlet installation angle β 1 of the long blade 121, and the outlet installation angle β 1 of the long blade 121 is 20 ° to 60 °, in this embodiment, the impeller 1 of the electrically-driven pump 100 is a centrifugal impeller with a low specific speed, and a larger outlet angle is usually selected to reduce the disc friction loss as much as possible, so as to ensure the efficient operation of the electrically-driven pump, but the large outlet installation angle β 1 may affect the performance stability of the impeller, and in order to obtain a stable performance curve and prevent the overload phenomenon, for the structure of the impeller 1 of this embodiment, the outlet installation angle β 1 of the long blade 121 of the present invention ranges from 20 ° to 60 °.

Referring to fig. 2 and 6, the long blade 121 includes a bottom portion including a first bottom portion 32 and a second bottom portion 42; the distance from the middle of the upper cover plate 11 to the edge of the upper cover plate 11, the second bottom 42 gradually decreases to the lower plane 1112 of the upper cover plate 11; at the first circumference, the tail part 45 is flush with the outer edge of the upper cover plate 11 of the impeller, and the tail part 45 is a small section of cylindrical surface, or the tail part 45 is a part of a virtual cylindrical surface formed by extending the outer edge of the upper cover plate 11; the tail part 45 is connected with the second concave surface 43 and the second convex surface 44 at the tail end of the long blade 121, the height of the tail part 45 is the minimum height of the long blade 121, and the height of the long blade 121 at the tail part 45 is defined as the outlet height H1 of the long blade 121. The bottom of long blade 121 is provided with the connection structure fixed with lower apron 13, and connection structure includes cylinder bellying 321 and protruding strip 322, and the protruding height of protruding strip 322 is less than the height of cylinder bellying 321, and protruding strip 322 sets up along the interval of bottom 1211, and every long blade 121 is provided with a cylinder bellying 321 and a plurality of protruding strip 322.

Referring to fig. 6, the short blade 122 is injection-molded with the flat portion 111 of the upper cover plate 11, the short blade 122 starts from an imaginary second circumference with a diameter Φ 2 and ends at a first circumference with a diameter Φ 1, the diameter Φ 2 of the second circumference is 0.6 to 0.7 times the first circumference Φ 1, the short blade 122 comprises a front end 1221, a concave side 1222, a convex side 1223 and a back end 1224, and a short blade bottom 1225, the front end 1221 comprises a circular arc connecting the concave side 1222 and the convex side 1223, the front end 1221 is disposed on the second circumference with a diameter Φ 2, the back end 1224 is disposed on the first circumference with a diameter Φ 1, at the intersection of the concave side 1222 and the first circumference, the tangent of the concave side 1224 forms an angle with the tangent of the first circumference which is the exit angle β of the short blade 122, the front end 1221 is the second tip 1221 of the short blade 122, the back end 1222 is the second tip of the short blade 122, the concave side 1224 is disposed at an angle β of the exit angle of the short blade 121, the third blade 1222 is disposed at a height of the center axis of the short blade 121, the short blade 1222, the center axis of the impeller 121, the long blade 122 is equal to the center of the center.

With combined reference to fig. 2 and 6 from the front end 1221 to the rear end 1224, the short vane bottom 1225 of the short vane 122 decreases in distance from the lower surface of the upper shroud, at a first circumference, the distance is at a minimum, and the short vane outlet height H2 is the minimum distance from the short vane bottom 1225 to the lower surface of the upper shroud at the first circumference; in this embodiment, the height of the short blade located in the same virtual circle is smaller than that of the long blade, the outlet height H2 of the short blade is smaller than that of the long blade H1, and after the impeller is formed in a combined manner, a certain interval or small gap is formed between the bottom 1225 of the short blade and the lower cover plate 13. On the first circumference, a second arc with a length of L2 is between the tangent of the concave side 1222 of the short blade and the tangent of the second concave surface 43 of the adjacent long blade, and the arc length L2 of the second arc is 0.35 to 0.5 times the arc length L1 of the first arc.

Referring to fig. 7 and 8, the lower cover plate 13 includes an upper side 131 and a lower side, the lower cover plate 13 is fixedly connected to the bottom of the blade 12 through the upper side 131, the upper side 131 of the lower cover plate 13 is configured to match the shape of the bottom of the blade 12, and the lower side of the lower cover plate 13 is substantially horizontal; blade mounting grooves 1311 are formed in the upper side 131 of the lower cover plate 13, the number of the blade mounting grooves 1311 is the same as that of the long blades 121, stripe protrusions 133 are arranged in the blade mounting grooves 1311, a mounting small hole 134 penetrating through the lower cover plate 13 is further formed in at least one blade mounting groove 1311, and a cylindrical protrusion 321 is arranged at the bottom of the corresponding long blade and matched with the mounting small hole 134. Each blade mounting groove 1311 is provided with one mounting aperture 134 in this embodiment; when the impeller 1 is installed, the cylindrical protrusion 321 of the bottom 1211 of the long blade 121 is inserted into the installation hole 134, the bottom 1211 of the long blade 121 is inserted into the blade installation groove 1311, and the long blade 121 and the lower cover plate 13 are fixed by ultrasonic welding to form the impeller 1. The lower cover plate 13 is formed with an impeller mounting hole 136, and the impeller 1 is fitted around the outer peripheral surface of the pump shaft 40 through the impeller mounting hole 136.

In this embodiment, the lower cover plate 13 and the rotor 2 are integrally injection-molded to form the second portion 52 of the rotor assembly 50, the rotor 2 includes the permanent magnet 21, referring to fig. 9 to 12, the permanent magnet 21 is substantially annular, the permanent magnet 21 is oriented in a polar anisotropy, N poles and S poles of the permanent magnet 21 alternately appear in a circumferential direction, in this embodiment, the permanent magnet 21 includes two N poles and two S poles, the permanent magnet 21 includes an outer circumferential surface 211 and an inner circumferential surface 212, the outer circumferential surface 211 is formed with four flat surfaces 2111 and four cylindrical surfaces 2112, and the flat surfaces 2111 are disposed at boundaries between adjacent S poles and N poles. As shown in fig. 12, for the permanent magnet 21, the stator assembly 60 is provided on the periphery of the outer peripheral surface 211 of the permanent magnet 21, and the magnetic lines of force are oriented in a substantially arc shape on the periphery of the permanent magnet 21, starting from the N-pole in the outer peripheral surface of the permanent magnet 21 and heading toward the S-pole in the outer peripheral surface of the permanent magnet 21 adjacent in the circumferential direction, as indicated by a single arrow in the figure; inside the permanent magnet 21, starting from the S pole of the permanent magnet 21, toward the N pole of the adjacent permanent magnet, as indicated by the double arrow in the figure; in the circumferential direction of the permanent magnet 21, the N pole and the S pole become the magnetic concentration portions 210, the distribution of magnetic lines of force between adjacent magnetic concentration portions 210 near the outer circumferential surface is small, and a plane 2111 is formed at this position, so that a portion with less magnetic flux can be removed, the magnetic density can be improved, and the weight of the permanent magnet 21 can be reduced; meanwhile, the permanent magnet 21 is used as the insert for injection molding of the rotor assembly in the embodiment, and the permanent magnet is demagnetized due to the high injection temperature, so that the permanent magnet 21 needs to be magnetized again after the rotor assembly is injection molded, and the plane 2111 can provide a positioning part for magnetization, so that the magnetized permanent magnet and the permanent magnet before injection molding have the same magnetic force distribution.

The long side of the plane 2111 is the same as the height of the permanent magnet 21, and the short side of the plane 2111 is approximately one third of the arc length of the cylindrical surface 2112, so that the magnetic flux density can be improved without affecting the magnetic flux.

The permanent magnet 21 further includes a first end surface 213 and a second end surface 214, the first end surface 213 is formed with four first protruding blocks 2131, the second end surface 214 is formed with four second protruding blocks 2141, the shapes of the first protruding blocks 2131 and the second protruding blocks 2141 are different, in this embodiment, the first protruding blocks 2131 are substantially circular, the second protruding blocks 2141 are substantially quadrilateral, and the first protruding blocks 2131 and the second protruding blocks 2141 are disposed corresponding to the magnetic concentration portion 210; such a bump can prevent the upper and lower surfaces of the permanent magnet 21 from being easily recognized and positioned when magnetized and mounted; meanwhile, in the rotor assembly 50 formed by taking the permanent magnet 21 as an injection molding insert, the protruding blocks can limit the rotation of the permanent magnet 21 relative to the injection molding body.

In this embodiment, the permanent magnet 21 is formed by injection molding, the injection molding material includes neodymium iron boron iron powder, the magnetic powder is arranged according to a predetermined rule by a special processing technology, and the permanent magnet 21 after injection molding meets the pre-design requirement. In addition, the permanent magnet may be formed by sintering.

Referring to fig. 3, 4, 5, 7 and 8, the rotor assembly 30 further includes a shaft sleeve 9, the shaft sleeve 9 is integrally injection-molded with the lower cover plate 13 of the impeller, and the material of the shaft sleeve 9 is the same as that of the lower cover plate 9; a boss 9 is formed around the impeller mounting hole 136, the boss 9 including a first section surrounded by the lower cover plate 13, a second section connecting the lower side surface 132 of the lower cover plate 13 and the first end surface 213 of the permanent magnet 21, and a third section surrounded by the permanent magnet 21; the inner circumferential surface of the shaft sleeve 9 is formed with groove structures 961, the groove structures 961 are uniformly distributed along the inner circumferential surface of the shaft sleeve 9, so that the working medium can enter between the shaft sleeve 9 and the pump shaft 40 to lubricate the contact surface of the shaft sleeve 9 and the pump shaft, and the groove structures 961 are uniformly distributed, so that the unbalance of the rotor assembly 50 during operation is reduced; the upper side surface of the lower cover plate 13 is provided with a communicating groove 135, the communicating groove 135 is communicated with a groove structure 961, axial movement of the rotor assembly 50 relative to the pump shaft 40 is limited between the rotor assembly 50 and the pump shaft 40 of the electric drive pump 100 of the embodiment through the snap spring 101, and the friction plate 102 is arranged between the snap spring 101 and the lower cover plate 13, so that working media can enter between the friction plate 102 and the upper side surface 131 through the communicating groove 135 to play a role in reducing friction; in addition, a certain gap 3133 is formed between the outer surface of the third section of the bushing 9 and the inner circumferential surface 212 of the permanent magnet 21, and the outer surface of the third section of the bushing 9 and the inner circumferential surface 212 of the permanent magnet 21 are connected by a connecting rib 3132, so that the material can be saved, the cost can be reduced, and the weight of the rotor assembly 50 can be reduced.

The formation of the rotor assembly 50 includes:

s1, processing parts; the permanent magnet injection molding method comprises the steps that permanent magnets are formed in an injection molding mode, the permanent magnets are formed into approximately annular permanent magnets with polar anisotropy orientation through injection molding of neodymium iron boron containing materials, and the permanent magnets meet the pre-designed surface magnet requirements;

s2, shaping of the first and second portions; the manufacturing method comprises the steps that a first part comprising an upper cover plate and a blade is formed by injection molding of a mixed material containing PPS and glass fibers, a permanent magnet 21 is used as an injection molding insert, and a second part comprising a shaft sleeve and a lower cover plate is formed by injection molding of the mixed material containing PPS and carbon fibers;

s3, forming a rotor assembly; the first part and the second part formed in the step S2 are installed through a connecting structure of the blade and the rear cover plate and are welded into a whole through ultrasonic waves after being installed;

and S4, magnetizing the molded rotor assembly. The process for forming the rotor assembly through the steps is relatively simple and convenient to install.

The permanent magnet formed in the step S1 includes a ring-shaped permanent magnet, the outer peripheral surface of the permanent magnet is formed with planes distributed at intervals, the end surface of the permanent magnet is formed with protruding blocks with different shapes, the planes are arranged between the adjacent N pole and S pole, and the protruding blocks are arranged at the corresponding positions of the corresponding N pole and S pole.

In the second part formed in step S2, the first end surface and the second end surface of the permanent magnet are covered with the injection molding layer, the tops of the first convex block and the second convex block are not covered with the injection molding layer, and the thickness of the injection molding layer is approximately the same as the height of the first convex block and the second convex block.

Referring to fig. 13 to 19, the electric drive pump 100 of the present embodiment further includes a heat dissipation assembly 80, the heat dissipation assembly 80 is capable of facilitating heat dissipation of the electronic control board 70, and the heat dissipation assembly 80 is fixedly disposed with the motor housing 30; the motor shell 30 comprises a motor shell side wall 301 and a motor shell bottom 302, the inner cavity of the motor shell 30 comprises a space enclosed by the motor shell side wall 301 and the motor shell bottom 302, the electric control board 70 is arranged in the inner cavity of the motor shell, and the heat dissipation assembly 80 comprises a heat dissipation part 81 arranged on the outer surface of the motor shell bottom 302 and a heat conduction part 82 arranged on the inner surface of the motor shell bottom 302.

The motor shell 30 is provided with a radiating component mounting part 303, and the radiating component mounting part 303 comprises a fan hole 3031, a step part 3032 and a bulge ring 3034; the sector hole 3031 is a through hole arranged at the bottom 302 of the motor shell; the step portion 3032 is positioned on the outer surface of the motor shell bottom 302 and arranged around the fan hole 3031, and the step surface 3033 of the step portion 3032 is lower than the outer surface of the motor shell bottom 302; a raised ring 3034 is disposed around the sector aperture 3031 at the inner surface of the motor housing base 302.

The heat dissipation portion 81 includes a plurality of heat dissipation fins 811 and a first metal plate 812, the first metal plate 812 includes a first surface 8121 and a second surface 8122, the heat dissipation fins 811 are fixed to the first surface 8121 of the first metal plate 812, and the second surface 8122 of the first metal plate 812 is connected to the heat conduction portion 82 through the motor housing bottom 302; the first metal plate 812 is sector-shaped, the periphery of the first metal plate 812 is arc-shaped, and after the heat dissipation part 81 is installed on the motor housing 30, the periphery of the first metal plate 812 and the side wall 301 of the motor housing can be flush with each other or slightly smaller than the side wall 301 of the motor housing; the inner periphery of the first metal plate 812 is arc-shaped and is arranged approximately parallel to the outer periphery; the outer perimeter arc length of the first metal plate 812 is greater than the inner perimeter arc length of the first metal plate 812; the first metal plate 812 is formed with a heat dissipation part mounting part, which includes a sector boss 8131, a cylindrical boss 8132 and a threaded hole 8136; sector convex parts 8131 are formed on convex parts of the second surface 8122, wherein the convex parts protrude from the second surface; a cylindrical boss 8132 formed on the first surface 8121 and protruding from the first surface 8121; the threaded hole 8136 extends into a threaded hole of the cylindrical boss 8132 from the sector boss 8131, and the threaded hole 8136 is a blind hole; in this embodiment, the height of the sector projection 8131 is approximately equal to the thickness of the raised ring 3034 from the outer surface of the motor casing bottom 302 to the inner surface of the motor casing bottom 302, the sector projection 8131 can be inserted into the sector hole 3031 of the motor casing bottom 302, and the gap between the two is small, so as to limit the rotation between the two; the number of the cylindrical bosses 8132 is two, and the cylindrical bosses 8132 are arranged between two adjacent rows of the heat dissipation fins and connected with the connected heat dissipation fins 811 into a whole.

In this embodiment, the heat sink 811 and the first metal plate 812 are fixedly disposed, the heat sink 811 is in a strip shape, the heat sink 811 is arranged in multiple layers from the outer periphery of the first metal plate 812 to the inner periphery of the first metal plate 812, intervals between the heat sinks of each layer are substantially the same, the first layer is disposed near the outer periphery of the first metal plate 812, the first layer includes a first heat sink 8111, the fourth layer is disposed near the inner periphery of the first metal plate 812, the fourth layer includes a fourth heat sink 8114, a second layer and a third layer are sequentially disposed between the first layer and the fourth layer, the second layer includes a second heat sink 8112, and the third layer includes a third heat sink 8113; the first heat radiating fin 8111 has the largest width and the smallest height, so that the strength of the first heat radiating fin 8111 can be improved and the first heat radiating fin 8111 can be prevented from being broken under the condition that the heat radiating area is ensured; since the radian from the outer periphery of the first metal plate 812 to the inner periphery of the first metal plate 812 is gradually reduced, the width of the metal heat sink 811 is gradually reduced while the height of the metal heat sink 811 is increased to ensure approximately the same heat dissipation area per layer, so that the width of the second heat sink is smaller than that of the first heat sink, the normal height of the second heat sink 8112 is higher than that of the first heat sink 8111, the width of the third heat sink 8113 is smaller than that of the second heat sink 8112, the normal height of the third heat sink 8113 is higher than that of the second heat sink 8112, the width of the fourth heat sink 8114 is smaller than that of the third heat sink 8113, and the height of the fourth heat sink 8114 is higher than that of the third heat sink 8113; a cylindrical boss portion 8132 is provided between a portion of the second fin and a portion of the third fin, and the cylindrical boss portion 8132 causes an increase in a heat radiation area of the portion, so that heights of the portion of the second fin and the portion of the third fin are substantially the same as a height of the first fin 8111.

Heat radiation assembly 80 further includes heat conduction portion 82, heat conduction portion 82 is disposed on the inner surface of motor housing bottom 302, heat conduction portion 82 includes second metal plate 821, second metal plate 821 is also fan-shaped, the outer edge of second metal plate 821 is larger than fan-shaped hole 3031 and smaller than protruding ring 3034, second metal plate 821 includes first side 8211 and second side 8212, first side 8212 of second metal plate 821 is disposed close to electric control board 70, the projection of several components of electric control board 70 with large heat generation to motor housing bottom 302 direction is located in the area of first side 8211 of second metal plate 821, the heat generated by components of electric control board 70 is transferred to second metal plate 821 through the upper surface of second metal plate 821, second metal plate 821 is generally a metal plate made of aluminum material, and the heat transfer effect is good; a certain distance is reserved between the components of the electric control board 70 and the second metal plate 821, so that the components of the electric control board 70 and the second metal plate 821 transfer heat through air, in order to enhance the heat transfer performance, heat-conducting glue is filled between the electric control board 70 and the second metal plate 821, the heat-conducting glue is not conductive, and the heat-conducting glue can be heat-conducting silica gel; the heat conducting plate is the second metal plate 821.

The first side surface 8211 is provided with a counter bore 86, and a screw 88 can be lower than the first side surface 8211 after being installed, so that the arrangement of components on the electric control board is not hindered; second side 8212 is provided with a counter sink portion 87, a counter bore 86 is provided through counter sink portion 87, counter sink portion 87 protrudes from second side 8212 by a certain height, the outer surface of counter sink portion 87 is substantially cylindrical, and a screw 88 passes through counter bore 86 and is fixedly connected with first metal plate 812.

The sector convex part 8131 of the first metal plate 812 is formed with a concave part 8135, the concave part 8135 comprises an arc surface, the arc surface can be matched with the outer surface of the counter part 87, so that the counter part 87 can be inserted into the concave part 8135, in the embodiment, the number of the counter parts 87 and the number of the concave parts 8135 are two, so that the counter parts 87 can be inserted into the concave part 8135 to limit the rotation between the first metal plate 812 and the second metal plate 821, and the bottom of the concave part 8135 is provided with a threaded hole 8136 which extends into the cylinder but does not penetrate through the cylinder; the heat dissipating assembly 80 further includes a sealing ring 89, the sealing ring 89 is disposed between the second surface 8122 of the first metal plate 812 and the outer surface of the bottom 302 of the motor housing, the sealing ring 89 is disposed on a step surface 3033 of the outer surface of the bottom 302 of the motor housing, and the sealing ring 89 is disposed around the outer periphery of the sector protrusion 8131 of the first metal plate 812.

The forming of the heat dissipation assembly 80 includes: s1, forming of parts: forming a heat radiating part, forming a heat conducting part, forming a sealing ring and forming a heat radiating assembly mounting part;

s2, assembling parts, namely fixing the formed heat dissipation part, the heat conduction part and the sealing ring with the heat dissipation assembly mounting part;

s3, filling heat-conducting glue, wherein the heat-radiating assembly comprises heat-conducting glue, and the heat-conducting glue is filled between the second metal plate and the electric control plate.

The heat dissipation part formed in the step S1 includes a heat dissipation fin and a first metal plate, the first metal plate includes a first surface, the heat dissipation fin is fixed to the first surface of the first metal plate, the first metal plate is sector-shaped, and the periphery of the first metal plate is arc-shaped; the first metal plate is provided with a heat dissipation part mounting part in a forming mode, and the heat dissipation part mounting part comprises a sector convex part, a cylindrical convex part and a threaded hole; the sector convex part is formed on the convex part of the second surface and is protruded out of the second surface; the cylindrical bulge is formed on the first surface and protrudes out of the bulge of the first surface; the threaded hole extends into the threaded hole of the cylindrical boss from the sector boss, the threaded hole is a blind hole, and a concave part is formed in the sector boss of the first metal plate;

the heat conducting part formed in the step S1 includes a second metal plate, the second metal plate is in a fan shape, the outer edge of the second metal plate is larger than the fan hole and smaller than the bulge loop, the second metal plate includes a first side surface and a second side surface, the first side surface of the second metal plate is arranged close to the electric control board, the projections of the electric control board, which generate heat in a large number of components, to the bottom direction of the motor casing are located in the area of the first side surface of the second metal plate, and the first side surface is provided with a counter bore; the second side surface is provided with a counter sink part, a counter sink penetrates through the counter sink part, the counter sink part protrudes from the second side surface by a certain height, and the outer surface of the counter sink part is approximately cylindrical;

wherein the forming of the part of step S1 includes: the motor shell is provided with a heat dissipation assembly mounting part which comprises a sector hole, a step part and a raised ring; the fan-shaped hole is a through hole arranged at the bottom of the motor shell; the stepped part is positioned on the outer surface of the bottom of the motor shell and arranged around the fan hole, and the stepped surface of the stepped part is lower than the outer surface of the bottom of the motor shell; the inner surface of the bulge ring at the bottom of the motor shell is arranged around the fan hole.

Wherein the assembling of the parts of the step S2 includes: the sealing ring is arranged at the step part of the motor shell, the sector bulge part of the first metal plate is inserted into the sector hole of the motor shell, the second metal plate is arranged on the inner surface of the bottom of the motor shell, the sunken platform part of the second metal plate is inserted into the sunken part of the first metal plate, the screw penetrates through the counter bore and the threaded hole to connect the first metal plate and the second metal plate, and then the heat dissipation assembly formed by the heat dissipation part and the heat conduction part is fixed with the motor shell.

It should be noted that: although the present invention has been described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the present invention may be modified and equivalents may be substituted for those skilled in the art, and all technical solutions and modifications that do not depart from the spirit and scope of the present invention should be covered by the claims of the present invention.

Claims

1. A rotor assembly, the rotor assembly includes the first part and the second part, the first part and the second part are separately processed, the first part is integrally injection molded, the first part includes the upper cover plate, the blade, the upper cover plate and the blade are integrally injection molded, the upper cover plate is formed with the blade inlet, the blade is formed with the first connection part towards the second part; the second part is injection molding, the second part comprises a lower cover plate, a rotor permanent magnet and a shaft sleeve, the second part is formed by injection molding with the rotor permanent magnet as an insert, an injection molding layer comprises the lower cover plate and the shaft sleeve, the lower cover plate faces the first part and is provided with a second connecting part, the first part and the second part are fixed through welding of the first connecting part and the second connecting part, the permanent magnet comprises an outer peripheral surface, the outer peripheral surface comprises a plane and a cylindrical surface, the plane and the cylindrical surface are arranged at intervals, the cylindrical surface comprises a magnetic concentration area of the permanent magnet, and the plane is arranged between the adjacent magnetic concentration areas.

2. The rotor assembly of claim 1, wherein: the first connecting part comprises a convex block and a convex strip, the convex block and the convex strip are arranged at the bottom of the blade and protrude towards the lower cover plate, the height of the convex strip is smaller than that of the convex block, and the height of the convex block is smaller than or equal to the thickness of the lower cover plate; the second connecting part comprises a groove arranged on the upper surface of the lower cover plate, stripe protrusions are arranged in the groove, small holes penetrating through the lower cover plate are formed in the groove, and the protrusion blocks are inserted into the small holes of the lower cover plate.

3. The rotor assembly of claim 1 or 2, wherein: the permanent magnet is annular, the permanent magnet is in polar anisotropic orientation, N poles and S poles of the permanent magnet alternately appear in the circumferential direction, and the positions of the N poles and the S poles are magnetic concentration areas of the permanent magnet; the permanent magnet includes an inner peripheral surface, which is cylindrical.

4. The rotor assembly of claim 3, wherein: the plane is rectangular, the height of the long side of the plane is the same as that of the permanent magnet, and the short side of the plane is one third of the arc length of the cylindrical surface.

5. The rotor assembly of claim 3, wherein: the permanent magnet comprises a first end face and a second end face, the first end face and the second end face are arranged in parallel, the first end face and the second end face are perpendicular to the outer peripheral face, a first protruding block is arranged on the first end face, a second protruding block is arranged on the second end face, the injection molding layer covers the first end face and the second end face, the first protruding block and the second protruding block form the top of the injection molding layer, and the thickness of the injection molding layer is smaller than that of the injection molding layer formed by the first end face and the second end face.

6. The rotor assembly of claim 5, wherein: the first convex blocks and the second convex blocks are different in shape, the first convex blocks and the second convex blocks correspond to the magnetic concentration areas of the permanent magnets, and the number of the first convex blocks and the number of the second convex blocks are the same as the total number of the N poles and the S poles of the permanent magnets.

7. A rotor assembly as claimed in claim 1 or 2 or 4 or 5 or 6, wherein: the shaft sleeve is formed by the injection molding layer and comprises an upper part, a middle part and a lower part, the upper part of the shaft sleeve and the lower cover plate are integrally injection molded, and the tail end of the upper part of the shaft sleeve is flush with the top of the cambered surface of the upper side surface of the lower cover plate; the lower part of axle sleeve set up in between permanent magnet up end and the lower terminal surface, the middle part of axle sleeve is connected the downside of apron down with the up end of permanent magnet.

8. The rotor assembly of claim 3, wherein: the shaft sleeve is formed by the injection molding layer and comprises an upper part, a middle part and a lower part, the upper part of the shaft sleeve and the lower cover plate are integrally injection molded, and the tail end of the upper part of the shaft sleeve is flush with the top of the cambered surface of the upper side surface of the lower cover plate; the lower part of axle sleeve set up in between permanent magnet up end and the lower terminal surface, the middle part of axle sleeve is connected the downside of apron down with the up end of permanent magnet.

9. The rotor assembly of claim 7, wherein: the inner surface of the shaft sleeve is provided with at least two sunken grooves which are uniformly distributed along the inner surface of the shaft sleeve, the sunken grooves penetrate through the upper surface and the lower surface of the shaft sleeve and are communicated with the inner hole of the shaft sleeve, and the tail end of the upper part of the shaft sleeve is provided with an extending part of the sunken grooves.

10. The rotor assembly of claim 7, wherein: a gap with a certain distance is formed between the outer surface of the shaft sleeve and the permanent magnet, and the outer surface of the shaft sleeve is connected with the permanent magnet through a connecting rib.

11. An electrically driven pump comprising a pump shaft, a rotor assembly disposed closer to the pump shaft than the stator assembly, the pump shaft fixedly disposed, the rotor assembly rotating about the pump shaft, characterized in that: the rotor assembly is as claimed in any one of claims 1 to 10.