CN107476987A

CN107476987A - Electronic water pump

Info

Publication number: CN107476987A
Application number: CN201710642750.2A
Authority: CN
Inventors: 葛笑; 王东; 陈金涛; 诸自强
Original assignee: Guangdong Welling Motor Manufacturing Co Ltd; Midea Welling Motor Technology Shanghai Co Ltd
Current assignee: Guangdong Welling Auto Parts Co Ltd; Anhui Welling Auto Parts Co Ltd
Priority date: 2017-07-31
Filing date: 2017-07-31
Publication date: 2017-12-15
Anticipated expiration: 2037-07-31
Also published as: CN107476987B

Abstract

The invention discloses a kind of electronic water pump, wherein, electric machine assembly (1) includes stator (11) and rotor (12), and its axial direction is provided at both ends with drive end bearing bracket (2) and rear end cap (3)；Hydraulic components (4) include pump case (41), impeller (42) and rotating shaft (43), rotating shaft through rotor and both be fixedly linked, one end of rotating shaft is connected through drive end bearing bracket with impeller；Stator includes stator body (111) and separator (112), separator limits liquid communication area with rotor, drive end bearing bracket and rear end cap, formed with protecgulum through hole (21) on drive end bearing bracket, rotating shaft formed with axially through central shaft hole (431), the connectivity structure for liquid communication area to be connected with central shaft hole is provided with rear end cap, so, it can be taken away by the coolant circulated by conducting to the heat of the stator body on separator outer surface, so as to reduce stator temperature；Meanwhile the heat of control panel (7) is walked by the conduction of the rear end cap liquid band that can also be cooled.

Description

Electronic water pump

Technical Field

The invention belongs to the technical field of water pumps, and particularly relates to an electronic water pump.

Background

At present, the electric water pump generally adopts motor element drive impeller rotatory, and then orders about the coolant liquid and impresses from electric water pump's coolant liquid entry, and then discharge from electric water pump's coolant liquid export, form comparatively stable flow. When the electronic water pump works, a stator winding and a controller power device in the motor assembly can emit a large amount of heat, and the running reliability of the electronic water pump is influenced.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the electronic water pump which can effectively reduce the temperature of the stator, thereby avoiding the damage of plastic parts and stator windings in the electronic water pump due to overhigh temperature and further improving the operation reliability of the electronic water pump.

In order to achieve the above object, the present invention provides an electronic water pump, including: the motor assembly comprises a stator and a rotor, and a front end cover and a rear end cover are arranged at two axial ends of the motor assembly; the hydraulic assembly comprises a pump shell, an impeller and a rotating shaft, the impeller and the rotating shaft are accommodated in the pump shell, the rotating shaft penetrates through the rotor and is fixedly connected with the rotor, one end of the rotating shaft penetrates through the front end cover and is connected with the impeller so as to drive the impeller to rotate, and two ends of the rotating shaft are respectively and rotatably arranged on the front end cover and the rear end cover; the stator comprises a stator main body and a partition piece wrapping the outside of the stator main body, the partition piece, the rotor, the front end cover and the rear end cover limit a liquid circulation area, a front cover through hole used for leading cooling liquid in the pump shell into the liquid circulation area is formed in the front end cover, a central shaft hole penetrating along the axial direction is formed in the rotating shaft, and a communication structure used for communicating the liquid circulation area with the central shaft hole is arranged on the rear end cover.

Preferably, the spacer is formed integrally with the stator body by injection molding.

Preferably, a gap through which the coolant flows is provided between a bottom surface of the front end cover and an axial end surface of the spacer.

Preferably, a plurality of front cover through holes are formed in the front end cover, the front cover through holes are uniformly distributed along the circumferential direction of the rotating shaft, and an area defined by the front cover through holes is opposite to the impeller.

Preferably, the communicating structure includes a sinking groove disposed on the top surface of the rear end cap, a bearing installation groove is disposed in the sinking groove, the rotating shaft is rotatably installed in the bearing installation groove through a bearing, and the bearing installation groove is formed with a plurality of communicating holes for introducing the cooling liquid in the liquid circulation area into the central axial hole of the rotating shaft.

Preferably, the electronic water pump includes a drive control assembly, the drive control assembly includes a control panel for controlling the operation of the motor assembly, the electronic water pump further includes a rear cover plate installed on the rear end cover, the partition and the rear cover plate define a control assembly accommodating cavity isolated from the liquid circulation area, and the control panel is located in the control assembly accommodating cavity.

Preferably, the control board is mounted on a bottom surface of the rear cover plate.

Preferably, a heat conducting medium is arranged between the control panel and the rear cover plate.

Preferably, the control board is made of an aluminum substrate.

Preferably, the inner peripheral wall of the partition and the rear end cover are provided with a first sealing ring therebetween, and the outer peripheral wall of the partition and the front end cover and the rear end cover are provided with a second sealing ring therebetween.

Through the technical scheme, in the electronic water pump, the rotating shaft is provided with the central shaft hole, the front end cover and the rear end cover are respectively provided with the front cover through hole and the communicating structure for communicating the liquid circulation area with the central shaft hole, so that cooling liquid can circularly flow in the liquid circulation area, the outer part of the stator main body is coated with the partition, and heat emitted by the stator main body can be quickly conducted to the outer surface of the partition.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic diagram of an electronic water pump according to a preferred embodiment of the present invention;

FIG. 2 is an overall cross-sectional view of the electronic water pump of FIG. 1;

FIG. 3 is a bottom view of the front end cap of FIG. 1;

fig. 4 is a top view of the rear end cap of fig. 1.

Description of reference numerals:

1 Motor Assembly 2 front end housing

3 rear end cover 4 hydraulic component

7 control panel

11 stator 12 rotor

21 through hole 31 sinking groove of front cover

32 rear cover plate 41 pump shell

42 impeller 43 shaft

81 first seal 82 second seal

111 stator body 112 spacer

311 bearing mounting groove 411 cooling liquid inlet

412 coolant outlet 431 central shaft hole

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like are generally described with respect to the orientation shown in the drawings or the positional relationship of the components with respect to each other in the vertical, or gravitational direction.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

The invention provides an electronic water pump, which comprises: the motor assembly 1 comprises a stator 11 and a rotor 12, and a front end cover 2 and a rear end cover 3 are arranged at two axial ends of the motor assembly 1; the hydraulic assembly 4 comprises a pump shell 41, an impeller 42 and a rotating shaft 43, wherein the impeller 42 and the rotating shaft 43 are accommodated in the pump shell 41, the rotating shaft 43 penetrates through the rotor 12 and is fixedly connected with the rotor 12, one end of the rotating shaft 43 penetrates through the front end cover 2 and is connected with the impeller 42 so as to drive the impeller 42 to rotate, and two ends of the rotating shaft 43 are respectively and rotatably arranged on the front end cover 2 and the rear end cover 3; the stator 11 includes a stator body 111 and a spacer 112 covering the stator body 111, the spacer 112, the rotor 12, the front cover 2 and the rear cover 3 define a liquid circulation region, the front cover 2 is formed with a front cover through hole 21 for introducing the cooling liquid in the pump housing 41 into the liquid circulation region, the rotating shaft 43 is formed with a central shaft hole 431 penetrating in the axial direction, and the rear cover 3 is provided with a communication structure for communicating the liquid circulation region with the central shaft hole 431.

In this embodiment, the rotating shaft 43 has a central shaft hole 431, and the front cover 2 and the rear cover 3 are respectively provided with a front cover through hole 21 and a communication structure for communicating the liquid circulation region with the central shaft hole 431, so that when the electronic water pump is operated, the cooling liquid can circulate in the liquid circulation region, and the exterior of the stator main body 111 is coated with the spacer 112, and a large amount of heat emitted from the stator main body 111 (the stator main body 111 includes the stator core and the stator winding) can be rapidly conducted to the outer surface of the spacer 112. So set up, when the electronic water pump during operation, through the circulation flow of coolant liquid in the liquid circulation district, the sustainable heat that will conduct stator main part 111 on the spacer 112 surface is taken away to can effectively reduce the temperature of stator 11, and then avoid appearing the situation that plastic component and stator winding damage because the temperature of stator 11 is too high, be favorable to improving the reliability of electronic water pump operation. In addition, the temperature of the stator 11 is too high, which causes the resistance of the stator winding to increase, and further affects the efficiency of the electronic water pump, so that the heat of the stator body 111 is taken away from the outer surface of the partition 112 through the circulation flow of the cooling liquid in the liquid circulation area, and further the temperature of the stator body 111 is reduced, which is beneficial to improving the efficiency of the electronic water pump.

Specifically, referring to fig. 1 and 2, a coolant inlet 411 and a coolant outlet 412 are further formed on the pump housing 41 of the electronic water pump, when the motor assembly 1 drives the impeller 42 in the pump housing 41 to rotate, the coolant is sucked into the pump housing 41 through the coolant inlet 411 and then thrown out from the coolant outlet 412 on the pump housing 41, and the coolant is continuously sucked and discharged, so that a relatively stable flow circulation is formed.

Further, with continued reference to fig. 1 and 2, a central shaft hole 431 is provided in the rotating shaft 43 of the hydraulic assembly 4, a front cover through hole 21 for introducing the coolant in the pump housing 41 into the fluid circulation region is formed in the front cover 2, and a communicating structure for communicating the fluid circulation region with the central shaft hole 431 is provided in the rear cover 3, so that when the electric water pump is operated, the rotating shaft 43 drives the impeller 42 to rotate in the pump housing 41, the coolant in the pump housing 41 is pressed into the fluid circulation region through the front cover through hole 21 in the front cover, the coolant flows through the gap between the spacer 112 and the rotor 12, and then enters the central shaft hole 431 of the rotating shaft 43 through the communicating structure in the rear cover 3, and finally the coolant flows out from one end of the rotating shaft 43 in the pump housing 41, so that the coolant can circulate in the fluid circulation region.

Specifically, the spacer 112 covering the stator main body 111 is mainly used for separating the stator main body 111 from the cooling liquid inside the electronic water pump and the liquid (such as water) outside the electronic water pump. The spacer 112 may be provided in various suitable arrangements, for example, the spacer 112 may be formed outside the stator body 111 by a tool injection method, or the finished spacer 112 may be sleeved outside the stator body 111 and tightly attached to the stator body 111, so long as the spacer 112 can separate the stator body 111 from the liquid outside the stator body 111. Preferably, referring to fig. 2, the spacer 112 is formed integrally with the stator body 111 by injection molding, so that the stator body 111 can be completely wrapped in the spacer 112, facilitating the isolation of the stator body 111 from the liquid outside thereof. In addition, the partition 112 is integrally injection molded, so that the operability is high and the production process is simple.

In addition, referring to fig. 2, a gap for cooling liquid to flow through is formed between the bottom surface of the front end cover 2 and the axial end surface of the spacer 112, so that one end of the stator main body 111 close to the front end cover 2 can also be located in the liquid flowing area, and compared with the case that the cooling liquid only takes away the temperature of the stator main body 111 through the inner peripheral wall of the spacer 112, the arrangement increases the heat dissipation area of the stator 11, and is more beneficial to reducing the temperature of the stator main body 111.

Specifically, referring to fig. 2 and 3, the front cover 2 is formed with a plurality of front cover through holes 21, the plurality of front cover through holes 21 are uniformly distributed along the circumferential direction of the rotating shaft 43, and the region surrounded by the plurality of front cover through holes 21 faces the impeller 42, so that the front cover through holes 21 are provided right below the impeller 42, and when the motor rotates, the coolant is forced into the liquid circulation region from below the impeller 42. In addition, the plurality of front cover through holes 21 are uniformly distributed along the circumferential direction of the rotating shaft 43, so that the cooling liquid can uniformly flow through the liquid circulation area, and the uniform cooling of the stator main body 111 is facilitated.

In addition, referring to fig. 2 and 4, the communication structure includes a sinking groove 31 provided on the top surface of the rear cover 3, a bearing installation groove 311 is provided in the sinking groove 31, the rotating shaft 43 is rotatably installed in the bearing installation groove 311 through a bearing, and the bearing installation groove 311 is formed with a plurality of communication holes for introducing the coolant in the liquid circulation region into the central shaft hole 431 of the rotating shaft 43, so that the coolant in the liquid circulation region can flow into the central shaft hole 431 of the rotating shaft 43 through the communication holes, thereby allowing the coolant to flow out from one end of the rotating shaft 43 located in the pump housing 41, and further realizing the circulation flow of the coolant. The communication structure provided in the rear cover 3 may be provided in other arrangements than the above arrangement, as long as it allows the coolant in the liquid flow region to flow into the central axial hole 431 of the rotary shaft 43.

Further, referring to fig. 2 and 4, the electronic water pump includes a driving control assembly including a control board 7 for controlling the operation of the motor assembly 1, and a rear cover plate 32 installed at the rear end cover 3, wherein the rear end cover 3, the spacer 112 and the rear cover plate 32 define a control assembly accommodating chamber isolated from the liquid circulation region, and the control board 7 is located in the control assembly accommodating chamber.

Specifically, by isolating the control assembly cavity containing the control board 7 from the liquid circulation area, the situation of short circuit of the control board 7 can be effectively avoided. In addition, when the electronic water pump works, the control panel 7 can also emit a large amount of heat, so that the control panel 7 is arranged in the control component accommodating cavity in the rear end cover 3, and the heat of the control panel 7 conducted to the top surface (namely the top surface of the rear cover plate 32) of the rear end cover 3 can be taken away through the cooling liquid flowing circularly, so that the temperature of the control panel 7 is favorably reduced, and the running reliability of the control panel 7 can be improved.

Further, with continued reference to fig. 2 and 4, the control board 7 is mounted on the bottom surface of the rear cover plate 32, so that the heat of the control board 7 is conveniently conducted to the bottom surface of the rear cover plate 32 and then conducted to the top surface of the rear end cover 3 (i.e. the top surface of the rear cover plate 32), and then the heat conducted to the control board 7 on the top surface of the rear end cover 3 is taken away by the circularly flowing cooling liquid, which is more beneficial to reducing the temperature of the control board 7.

Specifically, for the transmission and the diffusion of intensification temperature, refer to fig. 2, be provided with heat-conducting medium between control panel 7 and the back shroud 32, like this, can make to have better heat conductivity between control panel 7 and the back shroud 32 to the heat that makes control panel 7 distribute easily conducts on back shroud 32, and then cools down control panel 7 through the coolant liquid of back shroud 32 that flows through, is favorable to reducing the temperature of control panel 7. In addition, the control board 7 is made of an aluminum substrate, and the aluminum substrate can enable the control board 7 to have a better heat dissipation effect compared with a PCB.

Referring to fig. 2, a first seal 81 is provided between the inner peripheral wall of the spacer 112 and the rear cover 3, and a second seal 82 is provided between the outer peripheral wall of the spacer 112 and the front cover 2 and the rear cover 3. Specifically, the first gasket 81 located between the inner peripheral wall of the partition 112 and the rear end cap 3 is mainly used to prevent the coolant in the liquid flowing region from flowing into the control unit chamber. In addition, the second sealing ring 82 arranged between the outer peripheral wall of the partition 112 and the rear end cover 3 is mainly used for preventing liquid (such as water and the like) outside the electronic water pump from invading into the control component accommodating cavity; the second sealing ring 82 between the outer peripheral wall of the spacer 112 and the front end cap 2 can prevent the cooling liquid in the liquid flowing region from leaking outwards, and can also prevent the liquid outside the electronic water pump from entering the liquid flowing region.

It should be noted that other configurations of the electronic water pump according to the present invention are known to those skilled in the art, and are not described herein in detail to reduce redundancy.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims

1. An electronic water pump, comprising:

the motor assembly (1), the motor assembly (1) includes a stator (11) and a rotor (12), and a front end cover (2) and a rear end cover (3) are arranged at two axial ends of the motor assembly (1);

the hydraulic assembly (4) comprises a pump shell (41), an impeller (42) and a rotating shaft (43), wherein the impeller (42) and the rotating shaft (43) are accommodated in the pump shell (41), the rotating shaft (43) penetrates through the rotor (12) and is fixedly connected with the rotor (12), one end of the rotating shaft (43) penetrates through the front end cover (2) and is connected with the impeller (42) so as to drive the impeller (42) to rotate, and two ends of the rotating shaft (43) are rotatably mounted on the front end cover (2) and the rear end cover (3) respectively;

wherein,

the stator (11) comprises a stator main body (111) and a partition (112) covering the outside of the stator main body (111), the partition (112), the rotor (12), the front end cover (2) and the rear end cover (3) define a liquid circulation area, a front cover through hole (21) for introducing cooling liquid in the pump shell (41) into the liquid circulation area is formed in the front end cover (2), a central shaft hole (431) penetrating along the axial direction is formed in the rotating shaft (43), and a communication structure for communicating the liquid circulation area with the central shaft hole (431) is arranged on the rear end cover (3).

2. The electric water pump according to claim 1, wherein the spacer (112) is formed integrally with the stator body (111) by injection molding.

3. The electronic water pump according to claim 1, wherein a gap through which the coolant flows is provided between a bottom surface of the front cover (2) and an axial end surface of the spacer (112).

4. The electronic water pump according to claim 1, wherein the front cover (2) has a plurality of front cover through holes (21), the plurality of front cover through holes (21) are uniformly distributed along a circumferential direction of the rotating shaft (43), and a region surrounded by the plurality of front cover through holes (21) faces the impeller (42).

5. The electronic water pump according to claim 1, wherein the communication structure includes a depressed groove (31) provided on a top surface of the rear cover (3), a bearing installation groove (311) is provided in the depressed groove (31), the rotary shaft (43) is rotatably installed in the bearing installation groove (311) by a bearing, and the bearing installation groove (311) is formed with a plurality of communication holes for introducing the coolant in the liquid circulation region into the central shaft hole (431) of the rotary shaft (43).

6. The electronic water pump according to any one of claims 1-5, comprising a drive control assembly including a control board (7) for controlling the operation of the motor assembly (1), and a back cover plate (32) mounted to the back cover (3), wherein the back cover (3), the spacer (112), and the back cover plate (32) define a control assembly chamber isolated from the liquid circulation region, and the control board (7) is located in the control assembly chamber.

7. The electronic water pump according to claim 6, wherein the control board (7) is mounted on a bottom surface of the back cover plate (32).

8. The electronic water pump according to claim 6, wherein a heat transfer medium is provided between the control board (7) and the back cover plate (32).

9. The electronic water pump according to claim 6, wherein the control board (7) is made of an aluminum substrate.

10. The electronic water pump according to claim 6, wherein a first sealing ring (81) is arranged between the inner peripheral wall of the partition (112) and the rear end cover (3), and a second sealing ring (82) is arranged between the outer peripheral wall of the partition (112) and the front end cover (2) and the rear end cover (3).