Rotating shaft-impeller fixing structure, rotor assembly and electronic water pump applying same

Abstract

The utility model discloses a rotating shaft-impeller fixing structure, a rotor assembly and an electronic water pump using the rotor assembly, and relates to the technical field of electronic water pumps and parts of the electronic water pumps, and the rotating shaft-impeller fixing structure comprises a rotating shaft, an impeller assembly and a middle connecting component; the rotating shaft has rotating power, and the middle connecting component has elasticity; a shaft hole is formed in the impeller assembly, the rotating shaft is sleeved with the middle connecting component, and the middle connecting component penetrates into the shaft hole of the impeller assembly; the rotating shaft, the middle connecting component and the shaft hole of the impeller assembly are sequentially connected in a matched mode from inside to outside in the radial direction in an interference fit mode. The utility model mainly solves the problem of how to provide a rotating shaft-impeller fixing structure which is reliable in connection and not easy to damage for the electronic water pump. According to the utility model, the elastic middle connecting member is used as the middle connecting body to connect the rotating shaft and the impeller assembly, so that the rigid matching of the rotating shaft and the impeller assembly is avoided, and the problems of cracking, crushing and the like of the impeller assembly are further avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic water pump and its spare part technical field, concretely is a kind of fixed structure of rotating shaft-impeller, rotor assembly and the electronic water pump of application thereof. BACKGROUND

[0002] Electronic water pump has higher output efficiency and can realize accurate flow control, so electronic water pump is widely used in automobile, household appliance and industrial equipment, especially new energy automobile usually has two or more electronic water pumps, and electronic water pump is the power source of the entire cooling system of new energy automobile, and the power battery, drive motor and the like of new energy automobile need to rely on electronic water pump to drive coolant circulation cooling.

[0003] Impeller is one of important spare parts of electronic water pump, and it is distributed with several blades, and impeller can drive liquid flow when rotating, so as to complete the basic function of electronic water pump.

[0004] In one type of electronic water pump, impeller is sleeved on the rotating shaft of motor, or impeller is sleeved on the rotating shaft directly driven by wet rotor assembly.

[0005] For example, the Chinese utility model patent publication text with the announcement number CN216812264U and the name of "water pump with rotor sealing structure" is disclosed, the impeller 5 of which is sleeved on the rotating shaft 41 of rotor assembly 4 and is accommodated in the cavity 13 of pump shell 1, and the rotating shaft 41 of rotor assembly 4 drives the impeller 5 to rotate in the cavity 13 of pump shell 1; in the connection structure, in order to ensure the reliable connection of impeller 5 and rotating shaft 41, interference fit connection mode needs to be used, however, the impeller 5 and the rotating shaft 41 are both rigid structures, which can easily cause the impeller 5 to crack and break, thereby affecting the normal operation of the water pump.

[0006] For example, the Chinese utility model patent publication text with the announcement number CN218266477U and the name of "gap sealing structure between impeller and pump cover of water pump" is disclosed, the front end of motor shaft 3 penetrates into the shaft hole of impeller body 21, and screw 22 penetrates through the shaft hole of impeller body 21 and is locked into motor shaft 3, so as to realize the fixation of impeller body 21 and motor shaft 3; however, when the heat dissipation structure disclosed in the Chinese invention patent publication text with the publication number CN116677640A needs to be configured in the electronic water pump, flow guide channel must be arranged at the shaft core, and the screw fixation structure described above cannot be used to fix the impeller.

[0007] In summary, how to provide a reliable and not easy to damage rotating shaft-impeller fixation structure for electronic water pump has become one of the problems to be solved. UTILITY MODEL CONTENTS

[0008] The utility model discloses a purpose lies in providing a kind of fixed structure of shaft-impeller, rotor assembly and electronic water pump applied it, can provide reliable connection, not easy to damage fixed structure of shaft-impeller for electronic water pump.

[0009] To achieve the above object, the utility model provides the following technical scheme: a kind of fixed structure of shaft-impeller, it includes shaft, impeller assembly and intermediate connecting component;The shaft has rotary power;The intermediate connecting component has elasticity;The shaft hole is provided at the impeller assembly, the intermediate connecting component is set on the shaft, and the intermediate connecting component is inserted into the shaft hole of the impeller assembly;The shaft, the intermediate connecting component and the shaft hole of the impeller assembly, with interference fit, sequentially connect along the radial direction from inside to outside.

[0010] In the above technical scheme, the impeller assembly includes impeller base plate and impeller cover;The shaft hole is formed at the impeller base plate;A plurality of blades are arranged on the disc surface of the impeller base plate, with the shaft hole as center, along the circumferential direction;The impeller cover is fixed on the blade of the impeller base plate, so as to be integrated with the impeller base plate.

[0011] In the above technical scheme, one side of the impeller cover is arranged with a plurality of blade grooves along the circumferential direction, and the shape and number of the blade grooves are matched with the blades of the impeller base plate;The blades of the impeller base plate and the blade grooves of the impeller cover are mutually positioned and contacted, and the blades of the impeller base plate and the blade grooves of the impeller cover are mutually fixed by ultrasonic welding.

[0012] In the above technical scheme, one of the blades of the impeller base plate and the blade grooves of the impeller cover is formed with a positioning hole, and the other is formed with a positioning column.

[0013] In the above technical scheme, the inner wall of the shaft hole of the impeller assembly is arranged with first rotation-stopping teeth along the circumferential direction;The side surface of the intermediate connecting component is arranged with second rotation-stopping teeth along the circumferential direction;When the intermediate connecting component is inserted into the shaft hole of the impeller assembly, the second rotation-stopping teeth of the intermediate connecting component and the first rotation-stopping teeth of the impeller assembly are mutually matched.

[0014] In the above technical scheme, the inner wall of the shaft hole of the impeller assembly is pulled up along the radial direction, forming an axial fixing rib;The side surface of the intermediate connecting component is concave along the radial direction, forming an axial fixing groove;When the intermediate connecting component is inserted into the shaft hole of the impeller assembly, the axial fixing groove of the intermediate connecting component and the axial fixing rib of the impeller assembly are mutually matched.

[0015] In the technical scheme, the rotating shaft is provided with a flow guide channel penetrating through the rotating shaft along an axial direction; the end surface of the intermediate connecting member is provided with a flow guide hole penetrating through the end surface along the axial direction; and when the intermediate connecting member is sleeved on the rotating shaft, the flow guide hole of the intermediate connecting member is aligned with the flow guide channel of the rotating shaft.

[0016] A rotor assembly comprising the rotating shaft-impeller fixing structure.

[0017] In the technical scheme, the rotor assembly further comprises a rotor core, permanent magnets, a rotor sleeve and a thrust assembly; the rotor core is provided with a plurality of permanent magnet insertion grooves; the permanent magnets are inserted into the permanent magnet insertion grooves of the rotor core; the rotor sleeve is sleeved on and covers the surface of the rotor core; the thrust assembly comprises a thrust gasket, a buffer pad and a fixing cover; the thrust gasket is embedded in the buffer pad; one side of the buffer pad is in abutment with the rotor sleeve; the fixing cover is welded on the rotor sleeve and presses the buffer pad and / or the thrust gasket on the rotor sleeve; at least one of the rotor core, the rotor sleeve and the fixing cover of the thrust assembly is welded on the rotating shaft.

[0018] An electronic water pump comprising the rotor assembly.

[0019] Compared with the prior art, the rotor assembly and the electronic water pump comprising the same have the following advantages: the shaft hole of the rotating shaft, the intermediate connecting member and the impeller assembly are connected in sequence from inside to outside along the radial direction in an interference fit manner; during assembly, the intermediate connecting member is only needed to be sleeved on the rotating shaft and inserted into the shaft hole of the impeller assembly, without the need of using screws or other fixing members, thereby simplifying the assembly process; in addition, the intermediate connecting member with elasticity is used as an intermediate connecting body to connect the rotating shaft and the impeller assembly, thereby avoiding the rigid connection of the rotating shaft and the impeller assembly and avoiding the cracking and breaking of the impeller assembly; and the flow guide channel can be arranged on the rotating shaft to meet the heat dissipation requirement of the electronic water pump. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 It is a perspective view of the rotating shaft-impeller fixing structure in the utility model.

[0021] Fig. 2 It is an exploded view of the rotating shaft-impeller fixing structure in the utility model.

[0022] Fig. 3 It is a sectional view of the rotating shaft-impeller fixing structure in the utility model.

[0023] Fig. 4It is the perspective view of the rotor assembly in the utility model.

[0024] Fig. 5 It is the explosion view of the rotor assembly in the utility model.

[0025] Fig. 6 It is the cross section view of the rotor assembly in the utility model.

[0026] The figure mark is: 1, the rotating shaft;11, the flow guide channel;2, the impeller assembly;21, the impeller chassis;211, the shaft hole;2111, the first rotation stopping tooth;2112, the axial fixed rib;212, the blade;213, the positioning hole;22, the impeller cover;221, the blade slot;222, the ultrasonic line;223, the positioning column;3, the intermediate connecting component;31, the second rotation stopping tooth;32, the axial fixed slot;33, the flow guide hole;4, the rotor iron core;41, the permanent magnet insertion slot;5, the permanent magnet;6, the rotor sleeve;61, the rotor shell cover;7, the thrust assembly;71, the thrust gasket;72, the buffer pad;73, the fixed cover. DETAILED DESCRIPTION

[0027] The technical scheme in the embodiments of the utility model will be apparently and completely described below with the drawings in the embodiments of the utility model, and apparently, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the range protected by the utility model.

[0028] The embodiment provides a rotating shaft-impeller fixing structure, which can be applied in a water pump (especially an electronic water pump) and is used for connecting the rotating shaft and the impeller of the water pump.

[0029] Please refer to Figs. 1-3 The rotating shaft-impeller fixing structure of the embodiment comprises a rotating shaft 1, an impeller assembly 2 and an intermediate connecting component 3.

[0030] The rotating shaft 1 is a metal shaft with a cylindrical outer contour, and has rotating power.

[0031] The intermediate connecting component 3 is a cap-shaped component, which has elasticity, for example, is made of elastic materials such as silica gel, rubber or flexible plastic, so that the elasticity of the intermediate connecting component 3 can be obtained.

[0032] The impeller assembly 2 is provided with a shaft hole 211, the intermediate connecting component 3 is sleeved on the rotating shaft 1, and the intermediate connecting component 3 penetrates into the shaft hole 211 of the impeller assembly 2;The rotating shaft 1, the intermediate connecting component 3 and the shaft hole 211 of the impeller assembly 2 are connected in sequence from inside to outside along the radial direction in the form of interference fit.

[0033] Specifically, the impeller assembly 2 comprises an impeller base 21 and an impeller cover 22, wherein the impeller base 21 is an integrally formed disc-shaped member made of engineering plastic material, and the impeller cover 22 is an integrally formed cover-shaped member made of engineering plastic material; an axle hole 211 is formed in the impeller base 21, in this embodiment, the axle hole 211 is integrally injection molded in the center of the impeller base 21; a plurality of blades 212 are arranged on the disc surface of the impeller base 21 in the circumferential direction and centered on the axle hole 211, in this embodiment, the blades 212 are arc-shaped blades 212 extending in a spiral line direction, which are integrally injection molded on the disc surface of the impeller base 21; the impeller cover 22 is fixed on the blades 212 of the impeller base 21, so as to be fixed as a whole with the impeller base 21.

[0034] Further specifically, one side of the impeller cover 22 is arranged with a plurality of blade grooves 221 in the circumferential direction, and the shape and number of the blade grooves 221 are matched with the blades 212 of the impeller base 21, in this embodiment, the blade grooves 221 are integrally injection molded on one side of the impeller cover 22; the blades 212 of the impeller base 21 and the blade grooves 221 of the impeller cover 22 are in mutual position and contact, that is, the blades 212 of the impeller base 21 are correspondingly clamped into the blade grooves 221 of the impeller cover 22, and the blades 212 of the impeller base 21 and the blade grooves 221 of the impeller cover 22 are fixed with each other by ultrasonic welding; in this embodiment, the blade grooves 221 of the impeller cover 22 are provided with ultrasonic lines 222 at the bottom, so as to realize the ultrasonic welding process.

[0035] Further, one of the blades 212 of the impeller base 21 and the blade grooves 221 of the impeller cover 22 is formed with a positioning hole 213, and the other is formed with a positioning column 223, so as to realize the mutual positioning of the blades 212 and the blade grooves 221; in this embodiment, the positioning hole 213 is integrally formed on the top surface of the blade 212 of the impeller base 21, and the positioning column 223 is integrally formed on the bottom of the blade groove 221 of the impeller cover 22.

[0036] Further, the inner wall of the axle hole 211 of the impeller assembly 2 is arranged with first rotation stopping teeth 2111 in the circumferential direction, actually, the first rotation stopping teeth 2111 are annular tooth-shaped structures integrally formed on the inner wall of the axle hole 211 of the impeller assembly 2; the side surface of the intermediate connecting member 3 is arranged with second rotation stopping teeth 31 in the circumferential direction, actually, the second rotation stopping teeth 31 are annular tooth-shaped structures integrally formed on the side surface of the intermediate connecting member 3; when the intermediate connecting member 3 penetrates into the axle hole 211 of the impeller assembly 2, the second rotation stopping teeth 31 of the intermediate connecting member 3 and the first rotation stopping teeth 2111 of the impeller assembly 2 are matched (specifically, meshed) with each other, so that the impeller assembly 2 and the intermediate connecting member 3 obtain better rotation stopping capability.

[0037] Further, the inner wall of the shaft hole 211 of the impeller assembly 2 is pulled up in the radial direction to form an axial fixing rib 2112, which is actually an annular rib structure integrally formed on the inner wall of the shaft hole 211 of the impeller assembly 2; the side surface of the intermediate connecting member 3 is concave in the radial direction to form an axial fixing groove 32, which is actually an annular groove structure integrally formed on the side surface of the intermediate connecting member 3; when the intermediate connecting member 3 penetrates into the shaft hole 211 of the impeller assembly 2, the axial fixing groove 32 of the intermediate connecting member 3 cooperates with (specifically, engages with) the axial fixing rib 2112 of the impeller assembly 2, so that the impeller assembly 2 and the intermediate connecting member 3 have better axial limiting capability.

[0038] Further, the shaft 1 has a flow guide channel 11 formed therethrough in the axial direction, which is actually integrally formed with the shaft 1; the end surface of the intermediate connecting member 3 has a flow guide hole 33 formed therethrough in the axial direction, which is actually integrally formed with the intermediate connecting member 3; when the intermediate connecting member 3 is sleeved on the shaft 1, the flow guide hole 33 of the intermediate connecting member 3 is aligned with the flow guide channel 11 of the shaft 1; in this way, the shaft-impeller fixing structure of the embodiment can allow liquid medium to pass through, so that the rotor assembly, the stator assembly, the driving circuit board and other components of the electronic water pump are cooled by the liquid medium.

[0039] The embodiment also provides a rotor assembly comprising the shaft-impeller fixing structure.

[0040] Please refer to Figs. 4-6 The rotor assembly of the embodiment also comprises a rotor core 4, a permanent magnet 5, a rotor sleeve 6 and a thrust assembly 7.

[0041] The rotor core 4 is a solid body formed by stacking a plurality of silicon steel sheets, the permanent magnet 5 is a sheet-shaped component with permanent magnetism, and the rotor sleeve 6 is a cylindrical metal shell.

[0042] The rotor core 4 has a plurality of permanent magnet insertion grooves 41 formed therein, which are matched with the shape of the permanent magnet 5. The permanent magnet 5 is inserted into the permanent magnet insertion grooves 41 of the rotor core 4, and can be fixed in the permanent magnet insertion grooves 41 of the rotor core 4 by adhesive.

[0043] The rotor sleeve 6 is sleeved and covers the surface of the rotor core 4, in the embodiment, one end of the rotor sleeve 6 is integrally formed with a cover plate, the other end is provided with a detachable rotor cover 61, the main body of the rotor sleeve 6 is sleeved and covers the surface of the rotor core 4, and then the rotor cover 61 is covered, so that the surface of the entire rotor core 4 is covered, and after the rotor cover 61 and the rotor sleeve 6 are welded and fixed as a whole, the mutual fixation of the rotor cover 61, the rotor sleeve 6 and the rotor core 4 is realized.

[0044] The thrust assembly 7 comprises a thrust washer 71, a buffer pad 72 and a fixing cover 73, wherein the thrust washer 71 is a sheet-shaped body member made of wear-resistant ceramic material, the buffer pad 72 is an elastic member (such as silica gel, rubber and flexible plastic material) with a recess, and the fixing cover 73 is a thin metal cover plate; the thrust washer 71 is embedded in the buffer pad 72, one side of the buffer pad 72 abuts against the rotor sleeve 6, and the fixing cover 73 is welded on the rotor sleeve 6 and presses the buffer pad 72 and / or the thrust washer 71 on the rotor sleeve 6.

[0045] The rotor core 4, the rotor sleeve 6 and the fixing cover 73 of the thrust assembly 7 are welded and fixed with the rotating shaft 1, in this way, the fixation of the rotor assembly and the rotating shaft 1 is realized, so that the rotating shaft 1 is provided with rotating power by the rotor assembly.

[0046] The embodiment also provides an electronic water pump comprising the above rotor assembly.

[0047] The shaft-impeller fixing structure, the rotor assembly and the electronic water pump using the same of the embodiment are characterized in that the rotating shaft 1, the intermediate connecting member 3 and the shaft hole 211 of the impeller assembly 2 are sequentially connected in the radial direction from inside to outside in the form of interference fit; in assembly, the intermediate connecting member 3 is only needed to be sleeved on the rotating shaft 1 and inserted into the shaft hole 211 of the impeller assembly 2, without the need of setting a fixing member such as a screw, so that the assembly process is simplified; in addition, the intermediate connecting member 3 with elasticity is used as an intermediate connecting body to connect the rotating shaft 1 and the impeller assembly 2, so that the rigid connection of the rotating shaft 1 and the impeller assembly 2 is avoided, and the problems such as cracking and breaking of the impeller assembly 2 are avoided, and the flow guide channel 11 can be arranged at the rotating shaft 1 to meet the heat dissipation requirement of the electronic water pump.

[0048] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A fixed structure for a rotating shaft and impeller, characterized in that, Includes the shaft, impeller assembly, and intermediate connecting components; The rotating shaft has rotational power; The intermediate connecting member is elastic; The impeller assembly is provided with a shaft hole, the intermediate connecting member is sleeved on the rotating shaft, and the intermediate connecting member passes through the shaft hole of the impeller assembly. The shaft, the intermediate connecting member, and the impeller assembly are connected sequentially from the inside to the outside in the radial direction by means of interference fit.

2. The fixing structure of the shaft-impeller according to claim 1, characterized in that, The impeller assembly includes an impeller chassis and an impeller cover; The shaft hole is formed at the impeller base; On the surface of the impeller chassis, a number of blades are arranged circumferentially with the shaft hole as the center. The impeller cover is fixed to the blades of the impeller chassis, thus fixing it as a whole with the impeller chassis.

3. The fixing structure of the shaft-impeller according to claim 2, characterized in that, One side of the impeller cover is provided with a plurality of blade grooves along the circumferential direction, and the shape and number of the blade grooves are matched with the blades of the impeller chassis. The blades of the impeller chassis are aligned and in contact with the blade grooves of the impeller cover, and the blades of the impeller chassis and the blade grooves of the impeller cover are fixed to each other by ultrasonic welding.

4. The fixing structure of the shaft-impeller according to claim 3, characterized in that, The blades of the impeller chassis and the blade grooves of the impeller cover are respectively provided with positioning holes and positioning posts.

5. The fixing structure for the shaft-impeller according to any one of claims 1-4, characterized in that, The inner wall of the shaft hole of the impeller assembly is provided with a first anti-rotation tooth along the circumferential direction; The side surface of the intermediate connecting member is provided with a second anti-rotation tooth along the circumferential direction; When the intermediate connecting member is inserted into the shaft hole of the impeller assembly, the second anti-rotation tooth of the intermediate connecting member cooperates with the first anti-rotation tooth of the impeller assembly.

6. The fixing structure for the shaft-impeller according to any one of claims 1-4, characterized in that, The inner wall of the shaft hole of the impeller assembly is pulled up in the radial direction to form an axial fixing rib; The side surface of the intermediate connecting member is concave in the radial direction to form an axial fixing groove; When the intermediate connecting member is inserted into the shaft hole of the impeller assembly, the axial fixing groove of the intermediate connecting member cooperates with the axial fixing rib of the impeller assembly.

7. The fixing structure for the shaft-impeller according to any one of claims 1-4, characterized in that, The rotating shaft forms a flow channel that runs through itself along the axial direction; The end face of the intermediate connecting member forms a guide hole that penetrates itself along the axial direction; When the intermediate connecting member is sleeved on the rotating shaft, the guide hole of the intermediate connecting member is aligned with the guide channel of the rotating shaft.

8. A rotor assembly, characterized in that, The fixed structure includes the shaft-impeller as described in any one of claims 1-7.

9. The rotor assembly according to claim 8, characterized in that, It also includes the rotor core, permanent magnets, rotor housing, and thrust assembly; The rotor core has a plurality of permanent magnet slots formed therein, and the permanent magnets are inserted into the permanent magnet slots of the rotor core accordingly. The rotor housing is fitted onto and covers the surface of the rotor core; The thrust assembly includes a thrust washer, a buffer pad, and a fixing cover. The thrust washer is embedded in the buffer pad, and one side of the buffer pad abuts against the rotor housing. The fixing cover is welded to the rotor housing and presses the buffer pad and / or the thrust washer against the rotor housing. At least one of the rotor core, the rotor housing, and the fixing cover of the thrust assembly is welded and fixed to the rotating shaft.

10. An electronic water pump, characterized in that, Includes the rotor assembly as described in claim 8 or 9.

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