CN116677640A - Shaft core, electronic water pump and heat dissipation method of electronic water pump - Google Patents

Abstract

The invention discloses a shaft core, an electronic water pump and a heat dissipation method of the electronic water pump, and relates to the technical field of the electronic water pump and parts thereof. The invention mainly solves the problem of how to provide an efficient and reliable heat dissipation structure and a heat dissipation method for the electronic water pump; according to the shaft core, the electronic water pump and the heat dissipation method of the electronic water pump, the rotor chamber and the impeller chamber of the electronic water pump are communicated through the flow guide channel of the shaft core body, so that liquid media in the rotor chamber and the impeller chamber can flow rapidly, heat in the rotor chamber is conducted to the impeller chamber, or heat in the impeller chamber is conducted to the rotor chamber, and therefore heat dissipation performance of the electronic water pump can be effectively improved, and further performance and service life of the electronic water pump are improved.

Description

Shaft core, electronic water pump and heat dissipation method of electronic water pump

Technical Field

The invention relates to the technical field of electronic water pumps and parts thereof, in particular to a shaft core, an electronic water pump and a heat dissipation method of the electronic water pump.

Background

The electronic water pump has higher output efficiency and can realize accurate flow control, so that the electronic water pump is widely applied to automobiles, household appliances and industrial equipment, and especially, a new energy automobile is generally provided with two or more electronic water pumps, the electronic water pumps are power sources of the whole cooling system of the new energy automobile, and power batteries, driving motors and the like of the new energy automobile all need to drive cooling liquid to be cooled circularly by means of the electronic water pumps.

The main control circuit board of the electronic water pump is provided with a main control, a power electronic device for driving the stator assembly to operate and other peripheral circuits, and the stator assembly is composed of a plurality of enameled wire coils, so that the main control circuit board of the electronic water pump and the stator assembly are parts with larger heating value.

In order to dissipate heat of a main control circuit board, a stator assembly and other parts of an electronic water pump, two modes are generally adopted in the prior art:

1. a metal end cover with radiating fins or radiating columns is arranged at one end of the electronic water pump, the control circuit board is arranged close to the end cover, and heat exchange between the control circuit board and the metal end cover is realized through heat conduction silicone grease or other heat conduction media, so that heat is radiated outwards through the radiating fins or the radiating columns of the metal end cover; however, the heat exchange efficiency is low by adopting the natural convection heat dissipation mode, and the heat dissipation requirement of the high-power control circuit board is difficult to meet.

2. Packaging glue with good heat conduction performance is filled in a pump shell of the electronic water pump so as to conduct heat of a stator assembly in the pump shell to the outside of the pump shell, and meanwhile, the heat from the stator assembly is taken away through a liquid medium in a rotor chamber; however, the liquid medium in the rotor chamber has a slow flow rate, and it is difficult to quickly remove a large amount of heat.

In summary, how to provide an efficient and reliable heat dissipation structure and a heat dissipation method for an electronic water pump is a problem to be solved.

Disclosure of Invention

The invention aims to provide a shaft core, an electronic water pump and a heat dissipation method of the electronic water pump, which can provide an efficient and reliable heat dissipation structure and a heat dissipation method for the electronic water pump.

In order to achieve the above purpose, the present invention provides the following technical solutions: the shaft core is applied to an electronic water pump; it comprises a shaft core body; the shaft core body is provided with a flow guide channel which can be communicated with the rotor chamber and the impeller chamber of the electronic water pump.

In the above technical solution, the flow guiding channel includes a radial flow guiding sub-channel opened along a radial direction of the shaft core body, and an axial flow guiding sub-channel opened along an axial direction of the shaft core body; the radial flow guiding sub-channel and the axial flow guiding sub-channel are mutually communicated in the shaft core body.

In the above technical solution, at least one port of the radial flow guiding sub-channel is located in a rotor chamber of the electronic water pump; at least one port of the axial flow diversion sub-channel is positioned in an impeller chamber of the electronic water pump.

In the above technical solution, the inner diameter of the axial flow guiding sub-channel is d1, the inner diameter of the radial flow guiding sub-channel is d2, and the outer diameter of the axial core body is d; then there are: d/10.ltoreq.d1=d2.ltoreq.d/5.

An electronic water pump comprises the shaft core.

In the technical scheme, the electronic water pump further comprises a pump shell, a pump cover, a control box assembly, a rotor assembly, an impeller and a stator assembly; the pump cover covers one end of the pump shell to form a rotor chamber in the pump shell and an impeller chamber in the pump cover; the control box assembly comprises an inner end cover, a control circuit assembly and an outer box body, wherein the inner end cover is combined with the outer box body, the control circuit assembly is accommodated in a cavity surrounded by the inner end cover and the outer box body, and the control circuit assembly can exchange heat with the inner end cover; an inner end cap of the control box assembly is capped at the other end of the pump housing relative to the pump cap, enabling heat exchange between the liquid medium passing through the rotor chamber and the inner end cap; the stator assembly is integrated/fixed in the pump housing with the impeller chamber located in the inner ring of the stator assembly; at least one section of the shaft core body is supported in the rotor chamber, and the rotor assembly is sleeved on the section of the shaft core body; at least one other section of the shaft body is supported in the impeller chamber, and the impeller is sleeved on the section of the shaft body.

In the above technical solution, a shielding case is integrated on the pump case, and the shielding case forms an end part at the other end of the pump case opposite to the pump cover; the inner end cap of the control box assembly forms a sealing groove suitable for being matched with the end part of the shielding cover; the end part of the shielding cover enters the sealing groove of the inner end cover, and a sealing ring is arranged between the end part of the shielding cover and the sealing groove of the inner end cover.

In the above technical solution, the electronic water pump of the present invention further includes a bearing cover, which is covered on the pump casing and separates the rotor chamber and the impeller chamber; the bearing cover is embedded with a bearing, the inner end cover is embedded with a bearing at one side of the rotor chamber, the shaft core body is supported by the bearing on the bearing cover and the bearing on the inner end cover, and the shaft core body penetrates through the bearing cover to penetrate through the rotor chamber and the impeller chamber; and the bearing cover is provided with an overflow hole for the liquid medium in the rotor chamber and the impeller chamber to circulate mutually.

In the above technical scheme, the rotor assembly comprises a magnetic ring bracket fixed on the shaft core body and a magnetic ring fixed on the magnetic ring bracket.

The heat dissipation method of the electronic water pump is applied to the electronic water pump; it comprises the following steps:

the liquid medium circulates between the rotor chamber and the impeller chamber of the electronic water pump through the flow guide channel at the shaft core body so as to conduct the heat of the rotor chamber to the impeller chamber or conduct the heat of the impeller chamber to the rotor chamber.

Compared with the prior art, the invention has the beneficial effects that: according to the shaft core, the electronic water pump and the heat dissipation method of the electronic water pump, the rotor chamber and the impeller chamber of the electronic water pump are communicated through the flow guide channel of the shaft core body, so that liquid media in the rotor chamber and the impeller chamber can flow rapidly, heat in the rotor chamber is conducted to the impeller chamber, or heat in the impeller chamber is conducted to the rotor chamber, and therefore heat dissipation performance of the electronic water pump can be effectively improved, and further performance and service life of the electronic water pump are improved.

Drawings

Fig. 1 is a perspective view of a mandrel body in the present invention.

Fig. 2 is a cross-sectional view of the mandrel body of the present invention.

Fig. 3 is a perspective view of the electronic water pump in the present invention.

Fig. 4 is an exploded view of the electronic water pump in the present invention.

Fig. 5 is a cross-sectional view of an electronic water pump in the present invention.

Fig. 6 is a partial enlarged view of a in fig. 5.

The reference numerals are: 1. a shaft core body; 11. radial flow guiding sub-channels; 12. an axial flow guide sub-channel; 2. a pump housing; 21. a shield; 211. an end portion; 212. a seal ring; 22. a rotor chamber; 3. a pump cover; 31. a water inlet; 32. a water outlet; 33. an impeller chamber; 4. a control box assembly; 41. an inner end cap; 411. sealing grooves; 412. a bearing seat; 42. a control circuit assembly; 43. an outer case; 5. a bearing cap; 51. an overflow hole; 6. a bearing; 7. a rotor assembly; 71. a magnetic ring; 72. a magnetic ring bracket; 8. an impeller; 9. a stator assembly.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The embodiment provides a shaft core, which is applied to an electronic water pump and is used for supporting a rotor assembly and an impeller of the electronic water pump.

Referring to fig. 1 and 2, the shaft core of the present embodiment includes a shaft core body 1, and the shaft core body 1 is a metal shaft body formed by integral die casting or integral machining, and its outer contour is substantially cylindrical.

In order to improve the heat dispersion of the electronic water pump, a diversion channel is formed at the shaft core body 1, and the diversion channel can be communicated with the rotor chamber and the impeller chamber of the electronic water pump.

Through the water conservancy diversion passageway of axle core body 1, the rotor chamber and the impeller room of electronic water pump have been linked together, make the interior liquid medium of rotor chamber and impeller circulate fast to heat conduction to the impeller room with the rotor chamber, perhaps, heat conduction to the rotor chamber with the impeller room, with this mode, can effectively improve electronic water pump's heat dispersion, and then improve electronic water pump's performance and life.

Specifically, the flow guiding channel includes a radial flow guiding sub-channel 11 opened along the radial direction of the shaft core body 1, and an axial flow guiding sub-channel 12 opened along the axial direction of the shaft core body 1, that is, the radial flow guiding sub-channel 11 penetrates through the side surface of the shaft core body 1, and the axial flow guiding sub-channel 12 is communicated with two end surfaces of the shaft core body 1; the radial flow guiding sub-channel 11 and the axial flow guiding sub-channel 12 are communicated with each other in the shaft core body 1.

Specifically, at least one port of the radial flow guiding sub-channel 11 is located in the rotor chamber of the electronic water pump, in this embodiment, the port of the radial flow guiding sub-channel 11 is used as the inlet/outlet of the liquid medium in the rotor chamber; at least one port of the axial flow diversion sub-channel 12 is located in the impeller chamber of the electronic water pump, in this embodiment, the port of the axial flow diversion sub-channel 12 is used as the inlet/outlet of the liquid medium in the impeller chamber.

Further, the inner diameter of the axial flow guiding sub-channel 12 is d1, the inner diameter of the radial flow guiding sub-channel 11 is d2, and the outer diameter of the shaft core body 1 is d;

then there are: d/10.ltoreq.d1=d2.ltoreq.d/5.

When the relation is satisfied, the flow velocity of the liquid medium in the radial diversion sub-channel 11 and the axial diversion sub-channel 12 is consistent, the hydraulic loss is smaller, the influence on the performance of the electronic water pump is smaller, and meanwhile, the heat exchange efficiency is higher, so that the heat dissipation requirement of the electronic water pump can be satisfied.

Referring to fig. 3-6, the present embodiment further provides an electronic water pump, which includes the above-mentioned shaft core.

Specifically, the electronic water pump of the present embodiment further includes a pump housing 2, a pump cover 3, a control box assembly 4, a rotor assembly 7, an impeller 8, and a stator assembly 9.

The pump casing 2 is an integrally formed half shell made of engineering plastic or metal, the pump cover 3 is an integrally formed cover made of engineering plastic or metal, and the pump cover 3 is integrated with a water inlet 31 and a water outlet 32; the impeller 8 is an integrally formed engineering plastic or metal workpiece, and the impeller 8 is provided with a plurality of blades for driving water flow to run; the stator assembly 9 has a plurality of enameled wire coils, and the stator assembly 9 can generate a rotating magnetic field in an inner ring after being electrified.

The pump cover 3 is fitted over one end of the pump casing 2 (both are fixed to each other by screws) to form a rotor chamber 22 in the pump casing 2, and an impeller chamber 33 is formed in the pump cover 3, and in practice, the rotor chamber 22 and the impeller chamber 33 are chambers within the pump casing 2 and/or the pump cover 3.

The control box assembly 4 comprises an inner end cover 41, a control circuit assembly 42 and an outer box body 43, wherein the inner end cover 41 is made of metal material with good heat conduction performance, the outer box body 43 is made of engineering plastic material or half shell made of metal material which is integrally formed, the control circuit assembly 42 is based on a Printed Circuit Board (PCB), and a main control, power electronic devices for driving the stator assembly 9 to operate and other peripheral circuits are mounted on the control circuit assembly 42 and used for driving the stator assembly 9 to operate; the inner end cover 41 and the outer case 43 are combined with each other (the two are fixed to each other by screws), the control circuit assembly 42 is accommodated in a cavity surrounded by the inner end cover 41 and the outer case 43, and the control circuit assembly 42 can exchange heat with the inner end cover 41, for example, the control circuit assembly 42 is mounted closely to the inner end cover 41, and a heat conductive medium such as heat conductive silicone grease is provided between the control circuit assembly 42 and the inner end cover 41.

The inner end cap 41 of the control box assembly 4 is fitted over the other end of the pump housing 2 with respect to the pump cap 3 (both of which are fixed to each other by screws) so that the liquid medium passing through the rotor chamber 22 can be heat-exchanged with the inner end cap 41, and in fact, the liquid medium is in direct contact with the inner end cap 41, whereby heat exchange occurs.

The stator assembly 9 is integrated/fixed in the pump casing 2, such that the impeller chamber 33 is located in an inner ring of the stator assembly 9, in this embodiment, the stator assembly 9 is embedded in the pump casing 2 by means of in-mold injection, and of course, a terminal of the stator assembly 9 is exposed at one end of the pump casing 2 and welded on the control circuit assembly 42, so as to realize electrical connection between the stator assembly 9 and the control circuit assembly 42.

At least one section of the shaft core body 1 is supported in the rotor chamber 22, and the rotor assembly 7 is sleeved on the section of the shaft core body 1; at least one further section of the spindle body 1 is supported in an impeller chamber 33, over which section of the spindle body 1 the impeller 8 is sleeved.

Specifically, the pump casing 2 is integrated with a shielding cover 21, the shielding cover 21 is made of a material allowing a magnetic field to pass through, such as a plastic material, or a stainless steel material which is subjected to heat treatment to realize micro-magnetic conduction performance, in fact, the shielding cover 21 is tightly attached to the inner wall of the pump casing 2, and the inner space of the shielding cover 21 is the rotor chamber 22; the shield case 21 has an end portion 211 formed at the other end of the pump case 2 with respect to the pump cover 3, and the end portion 211 is in an open form; the inner end cap 41 of the control box assembly 4 forms a seal groove 411 adapted to mate with the end 211 of the shield 21, i.e., the seal groove 411 is an annular groove; the end 211 of the shield 21 enters into the sealing groove 411 of the inner end cap 41, and a sealing ring 212 is provided between the end 211 of the shield 21 and the sealing groove 411 of the inner end cap 41, in such a way that a seal between the rotor chamber 22 and the inner end cap 41 is achieved.

Further, the electronic water pump of the present embodiment further includes a bearing cover 5, where the bearing cover 5 is an integrally formed cover made of engineering plastic or metal, and the bearing cover 5 is covered on the pump casing 2 (the two are fixed with each other by a screw) and separates the rotor chamber 22 and the impeller chamber 33; the bearing cap 5 is embedded with a bearing 6 (e.g., a ceramic bearing, a graphite bearing, or a self-lubricating sleeve), the inner end cap 41 is also embedded with a bearing 6 on one side of the rotor chamber 22 (the inner end cap 41 forms a bearing seat 412 on one side of the rotor chamber 22, the bearing 6 is embedded in the bearing seat 412), the shaft core body 1 is supported by the bearing 6 on the bearing cap 5 and the bearing 6 on the inner end cap 41, and the shaft core body 1 passes through the bearing cap 5 to penetrate the rotor chamber 22 and the impeller chamber 33; the bearing cap 5 is provided with an overflow hole 51 for allowing the liquid medium in the rotor chamber 22 and the impeller chamber 33 to flow through each other, and in practice, the overflow hole 51 is a through hole penetrating through both sides of the bearing cap 5.

Specifically, the rotor assembly 7 includes a magnet ring bracket 72 fixed to the shaft core body 1, and a magnet ring 71 fixed to the magnet ring bracket 72; in some possible embodiments, the shaft core body 1 and the magnetic ring 71 are placed in a mold of the magnetic ring support 72, and the magnetic ring support 72 is formed by an in-mold injection molding method, that is, the shaft core body 1, the magnetic ring support 72 and the magnetic ring 71 are integrally formed.

The embodiment also provides a heat dissipation method of the electronic water pump, which applies the electronic water pump; it comprises the following steps: the liquid medium circulates between the rotor chamber 22 and the impeller chamber 33 of the electronic water pump through the flow guide passage at the shaft core body 1 to conduct heat of the rotor chamber 22 to the impeller chamber 33 or conduct heat of the impeller chamber 33 to the rotor chamber 22.

Taking the embodiment as an example, the heat dissipation method of the electronic water pump of the embodiment is further specifically described:

after the control circuit assembly 42 is electrified, the stator assembly 9 is driven to operate, so that the stator assembly 9 generates a rotating magnetic field in an inner ring of the stator assembly, and the magnetic ring 71 of the rotor assembly 7 starts to rotate under the magnetic coupling action of the rotating magnetic field, so that the magnetic ring bracket 72, the shaft core body 1 and the impeller 8 which are directly/indirectly connected with the rotor assembly are driven to rotate, and the rotating impeller 8 can drive a liquid medium in the impeller chamber 33 to operate (the liquid medium is sucked from the water inlet 31 of the pump cover 3 and is discharged from the water outlet 32 of the pump cover 3), so that the body function of the electronic water pump is completed; meanwhile, as the bearing cover 5 is provided with the overflow hole 51, the liquid medium in the impeller chamber 33 can flow into the rotor chamber 22, the liquid medium in the rotor chamber 22 is contacted with the shielding cover 21 of the pump shell 2, so that the heat of the shielding cover 21 can be taken away, and further, the heat of the stator assembly 9 embedded in the pump shell 2 can be taken away, and meanwhile, the liquid medium in the rotor chamber 22 is contacted with the inner end cover 41 of the control box assembly 4, so that the heat of the inner end cover 41 can be taken away, and further, the heat of the circuit assembly 42 can be controlled; the liquid medium in the rotor chamber 22 enters the radial flow guiding sub-channel 11 of the shaft core body 1, passes through the axial flow guiding sub-channel 12 and returns to the impeller chamber 33, is discharged from the water outlet 32 of the pump cover 3, and enters the liquid medium circulation of the next round.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. The shaft core is applied to an electronic water pump; it is characterized in that the method comprises the steps of,

comprises a shaft core body;

the shaft core body is provided with a flow guide channel which can be communicated with the rotor chamber and the impeller chamber of the electronic water pump.

2. The mandrel of claim 1, wherein: the flow guide channel comprises a radial flow guide sub-channel which is arranged along the radial direction of the shaft core body and an axial flow guide sub-channel which is arranged along the axial direction of the shaft core body;

the radial flow guiding sub-channel and the axial flow guiding sub-channel are mutually communicated in the shaft core body.

3. The mandrel of claim 2, wherein: at least one port of the radial flow guiding sub-channel is positioned in a rotor chamber of the electronic water pump;

at least one port of the axial flow diversion sub-channel is positioned in an impeller chamber of the electronic water pump.

4. A mandrel according to claim 2 or 3, characterized in that: the inner diameter of the axial flow guiding sub-channel is d1, the inner diameter of the radial flow guiding sub-channel is d2, and the outer diameter of the shaft core body is d;

then there are: d/10.ltoreq.d1=d2.ltoreq.d/5.

5. An electronic water pump comprising the shaft core of any one of claims 1-4.

6. The electronic water pump of claim 5, wherein: the motor also comprises a pump shell, a pump cover, a control box assembly, a rotor assembly, an impeller and a stator assembly;

the pump cover covers one end of the pump shell to form a rotor chamber in the pump shell and an impeller chamber in the pump cover;

the control box assembly comprises an inner end cover, a control circuit assembly and an outer box body, wherein the inner end cover is combined with the outer box body, the control circuit assembly is accommodated in a cavity surrounded by the inner end cover and the outer box body, and the control circuit assembly can exchange heat with the inner end cover;

an inner end cap of the control box assembly is capped at the other end of the pump housing relative to the pump cap, enabling heat exchange between the liquid medium passing through the rotor chamber and the inner end cap;

the stator assembly is integrated/fixed in the pump housing with the impeller chamber located in the inner ring of the stator assembly;

at least one section of the shaft core body is supported in the rotor chamber, and the rotor assembly is sleeved on the section of the shaft core body; at least one other section of the shaft body is supported in the impeller chamber, and the impeller is sleeved on the section of the shaft body.

7. The electronic water pump of claim 6, wherein: a shield case is integrated on the pump case, and an end part is formed at the other end of the pump case opposite to the pump cover;

the inner end cap of the control box assembly forms a sealing groove suitable for being matched with the end part of the shielding cover;

the end part of the shielding cover enters the sealing groove of the inner end cover, and a sealing ring is arranged between the end part of the shielding cover and the sealing groove of the inner end cover.

8. The electronic water pump of claim 6, wherein: the bearing cover is covered on the pump shell and separates the rotor chamber and the impeller chamber;

the bearing cover is embedded with a bearing, the inner end cover is embedded with a bearing at one side of the rotor chamber, the shaft core body is supported by the bearing on the bearing cover and the bearing on the inner end cover, and the shaft core body penetrates through the bearing cover to penetrate through the rotor chamber and the impeller chamber;

and the bearing cover is provided with an overflow hole for the liquid medium in the rotor chamber and the impeller chamber to circulate mutually.

9. The electronic water pump of claim 6, wherein: the rotor assembly comprises a magnetic ring bracket fixed on the shaft core body and a magnetic ring fixed on the magnetic ring bracket.

10. A heat dissipation method of an electronic water pump, characterized in that the electronic water pump of any one of claims 5-9 is applied; it comprises the following steps:

the liquid medium circulates between the rotor chamber and the impeller chamber of the electronic water pump through the flow guide channel at the shaft core body so as to conduct the heat of the rotor chamber to the impeller chamber or conduct the heat of the impeller chamber to the rotor chamber.