Driving circuit board assembly and heat dissipation structure of electronic water pump

Abstract

The invention discloses a driving circuit board assembly and heat dissipation structure of an electronic water pump, and relates to the technical field of electronic water pumps and parts thereof, and the driving circuit board assembly and heat dissipation structure at least comprises a pump shell component, a driving circuit board and a stator assembly; an isolation bottom plate is formed in the pump shell component and divides the pump shell component into an electromechanical cavity and a circuit board fixing cavity, and the electromechanical cavity of the pump shell component is further divided into a liquid medium cavity. The circuit board fixing arm of the stator assembly can fix the driving circuit board in the circuit board fixing cavity of the pump shell component, and the driving circuit board can exchange heat with the isolation bottom plate of the pump shell component and further exchange heat with the liquid medium in the liquid medium cavity. The drive circuit board can be fixed in the pump shell component without screws, the material cost of the screws is saved, the assembly process of the drive circuit board is simplified, and the circuit board fixing arm of the stator assembly can elastically support and fix the drive circuit board so as to reduce the possibility of damage to the drive circuit board.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic water pumps and parts thereof, in particular to a drive circuit board assembly and heat dissipation structure of an electronic water pump. Background Art

[0002] Electronic water pumps have high output efficiency and can achieve precise flow control. Therefore, electronic water pumps are widely used in automobiles, household appliances and industrial equipment. For example, new energy vehicles are usually equipped with two or more electronic water pumps as the power source for the entire cooling system.

[0003] The driver circuit board is one of the core components of the electronic water pump. It can receive electrical energy and / or control signals from the outside, and pass a current of a specific waveform into the stator assembly of the electronic water pump to drive the stator assembly to generate a rotating magnetic field, and then magnetically couple the rotor-impeller assembly of the electronic water pump to rotate, thereby realizing the basic functions of the electronic water pump.

[0004] The driving circuit board of the electronic water pump is equipped with the main control, stator assembly drive module / chip, power electronic devices and other necessary peripheral circuits. It can be seen that the driving circuit board of the electronic water pump is a precision electronic device and has a large heat generation.

[0005] The electronic water pumps in the prior art still have at least the following technical problems:

[0006] 1. The driver circuit board of the electronic water pump is generally fastened to the pump body structure of the electronic water pump with screws. Since a large downward pressure or pulling force is generated when the screws are tightened, it is very easy to cause the driver circuit board to deform, which in turn affects the components mounted on the driver circuit board, causing stress damage to the components and causing failure of the electronic water pump. The above stress damage is usually not easy to detect, resulting in a high defective rate of the electronic water pump.

[0007] 2. Some electronic water pumps will configure a liquid cooling structure for the driver circuit board. Specifically, the driver circuit board is mounted on the dry and wet shielding plate (usually made of metal) of the electronic water pump, and a heat-conducting medium is coated between the driver circuit board and the dry and wet shielding plate so that the heat generated by the driver circuit board can be absorbed by the dry and wet shielding plate. The other side of the dry and wet shielding plate is the pump cavity of the electronic water pump. At this time, the heat absorbed by the dry and wet shielding plate will be absorbed by the liquid medium in the pump cavity, thereby realizing liquid cooling of the driver circuit board; however, the technical problem of the above structure is that the cost of the dry and wet shielding plate is high, which makes the overall cost of the electronic water pump also high. In addition, the metal dry and wet shielding plate may have problems such as leakage and short circuit, affecting the stability and safety of the electronic water pump.

[0008] In summary, how to provide a reasonable, efficient, stable, and damage-resistant assembly structure for the electronic water pump's driver circuit board, and provide the driver circuit board with better liquid cooling and heat dissipation function, has become one of the urgent problems to be solved. Summary of the Invention

[0009] The purpose of the present invention is to provide a driving circuit board assembly and heat dissipation structure for an electronic water pump, which can provide a reasonable, efficient, stable, and damage-resistant assembly structure for the driving circuit board of the electronic water pump, and can provide liquid cooling and heat dissipation function for the driving circuit board.

[0010] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a drive circuit board assembly and heat dissipation structure for an electronic water pump, applied to an electronic water pump; the electronic water pump comprises at least a pump casing component, a drive circuit board and a stator assembly; an isolation base plate is formed in the pump casing component, the isolation base plate separates the pump casing component into an electromechanical chamber and a circuit board fixing chamber, and the electromechanical chamber of the pump casing component is also separated into a liquid medium chamber; a circuit board fixing arm is arranged at the stator assembly; the stator assembly is accommodated and fixed in the electromechanical chamber of the pump casing component, and the circuit board fixing arm of the stator assembly penetrates into the circuit board fixing chamber of the pump casing component; the drive circuit board is accommodated in the circuit board fixing chamber of the pump casing component, and the circuit board fixing arm of the stator assembly can fix the drive circuit board in the circuit board fixing chamber of the pump casing component; the drive circuit board can exchange heat with the isolation base plate of the pump casing component, and then exchange heat with the liquid medium in the liquid medium chamber.

[0011] In the above technical solution, the stator assembly includes a stator bracket, a stator core, a stator winding and a terminal; the circuit board fixing arm is fixed / integrally formed at the stator bracket; at least a portion of the stator core is wrapped and supported by the stator bracket; the stator winding is wound around the teeth of the stator core according to polarity; the terminal is plugged and fixed on the stator bracket and is electrically connected to the stator winding; the terminal of the stator assembly is inserted into the circuit board fixing cavity of the pump housing component and is electrically connected to the drive circuit board.

[0012] In the above technical solution, a snap-fitting through hole is provided at the isolation bottom plate of the pump casing component; the circuit board fixing arm of the stator assembly located in the electromechanical chamber of the pump casing component passes through the snap-fitting through hole of the isolation bottom plate and enters the circuit board fixing cavity of the pump casing component; the circuit board fixing arm of the stator assembly can apply force to the drive circuit board from one side of the drive circuit board, and make the other side of the drive circuit board rest against the isolation bottom plate of the pump casing component to snap-fit and fix the drive circuit board.

[0013] In the above technical solution, the circuit board fixing arm of the stator assembly has a guide surface and a stop surface formed at its end in sequence; a buckling notch is provided at the driving circuit board; when the driving circuit board is buckled and fixed, the guide surface on the circuit board fixing arm of the stator assembly can be guided into the buckling notch of the driving circuit board until the stop surface on the circuit board fixing arm passes through the buckling notch of the driving circuit board; the stop surface on the circuit board fixing arm can apply force to the driving circuit board from one side of the driving circuit board.

[0014] In the above technical solution, the circuit board fixing arm of the stator assembly has its end further inner than the locking surface, and also forms a limiting surface; the limiting surface of the stator assembly is used to axially limit the relative position of the stator assembly and the driving circuit board; and / or, the limiting surface of the stator assembly is used to axially limit the relative position of the stator assembly and the pump casing component.

[0015] In the above technical solution, a terminal through-hole is provided at the isolation bottom plate of the pump casing component; the terminal of the stator assembly located in the electromechanical chamber of the pump casing component passes through the terminal through-hole of the isolation bottom plate and enters the circuit board fixing cavity of the pump casing component; a terminal welding hole is provided at the drive circuit board; the terminal of the stator assembly is inserted into and welded to the terminal welding hole of the drive circuit board, so that the terminal of the stator assembly is electrically connected to the drive circuit board.

[0016] In the above technical solution, a positioning protrusion is formed on the stator bracket of the stator assembly; the positioning protrusion is used to circumferentially limit the relative position of the stator core and the stator bracket.

[0017] In the above technical solution, the isolation base plate of the pump housing member is formed with a component-shaped embedding groove on one side of the circuit board fixing cavity; at least part of the components of the driving circuit board can be embedded in the component-shaped embedding groove of the isolation base plate.

[0018] In the above technical solution, a heat-conducting medium is coated between the driving circuit board and the isolation bottom plate of the pump housing component.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: the drive circuit board assembly and heat dissipation structure of the electronic water pump of the present invention, the circuit board fixing arm of the stator assembly can fix the drive circuit board in the circuit board fixing cavity of the pump casing component, so that the drive circuit board can be fixed in the pump casing component without screws, saving the material cost of screws and simplifying the assembly process of the drive circuit board. In addition, the circuit board fixing arm of the stator assembly can elastically support and fix the drive circuit board, so as to reduce the possibility of damage to the drive circuit board and improve the reliability of the electronic water pump; an isolation bottom plate is formed in the pump casing component, so that the dry and wet isolation plate is integrated into the pump casing component. The driving circuit board can exchange heat with the isolation bottom plate of the pump casing component, and then exchange heat with the liquid medium in the liquid medium chamber, so that the driving circuit board can obtain the liquid cooling and heat dissipation function while eliminating the material cost and assembly cost of the dry and wet isolation plate, thereby reducing the cost of the electronic water pump; furthermore, the circuit board fixing arm of the stator assembly can apply force to the driving circuit board from one side of the driving circuit board, and make the other side of the driving circuit board rest against the isolation bottom plate of the pump casing component to buckle and fix the driving circuit board, so that the driving circuit board is tightly combined with the isolation bottom plate of the pump casing component, thereby improving the heat exchange efficiency between the driving circuit board and the isolation bottom plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional view of the present invention.

[0021] Figure 2 for Figure 1 A partial enlarged view in .

[0022] Figure 3 This is an exploded view of the present invention.

[0023] Figure 4 This is an exploded view of the stator assembly in the present invention.

[0024] Figure 5 It is a cross-sectional view of the present invention.

[0025] The accompanying drawings are marked as follows: 1. Pump casing component; 11. Isolation base plate; 111. Fastening through hole; 112. Component contoured groove; 113. Terminal through hole; 12. Electromechanical chamber; 121a. Liquid medium chamber; 13. Circuit board fixing chamber; 2. Drive circuit board; 21. Fastening notch; 22. Terminal welding hole; 23. Component; 3. Stator assembly; 31. Stator bracket; 311. Circuit board fixing arm; 311a. Guide surface; 311b. Stopping surface; 311c. Limiting surface; 312. Positioning protrusion; 32. Stator core; 33. Stator winding; 34. Terminal. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] This embodiment provides a drive circuit board assembly and heat dissipation structure for an electronic water pump, which is applied to an electronic water pump.

[0028] See also Figure 1-Figure 5 The electronic water pump of this embodiment includes at least a pump housing component 1, a driving circuit board 2 and a stator assembly 3.

[0029] The pump housing component 1 is an integrally injection-molded shell-shaped component made of engineering plastic material, and its preferred material is high thermal conductivity plastic, so that the pump housing component 1 as a whole has good thermal conductivity.

[0030] Among them, the driving circuit board 2 is a printed circuit board (PCB), which is equipped with a main control, a stator component 3 driving module / chip, power electronic devices and other necessary peripheral circuits, and is used to drive the stator component 3 to operate, so that the stator component 3 can generate a rotating magnetic field, and then drive the rotor assembly of the electronic water pump to rotate.

[0031] An isolation base plate 11 is formed in the pump casing component 1, and the isolation base plate 11 separates the pump casing component 1 into an electromechanical chamber 12 and a circuit board fixing chamber 13, and the electromechanical chamber 12 of the pump casing component 1 is also separated into a liquid medium chamber 121a; specifically, the isolation base plate 11 is a plate-like structural feature that is formed integrally in the pump casing component 1 in a horizontal form. On one side of the electromechanical chamber 12 of the pump casing component 1, a dry and wet shielding cylinder (not shown in the figure) is provided that is sealed and connected to the isolation base plate 11, so that the electromechanical chamber 12 of the pump casing component 1 is separated into a liquid medium chamber 121a in the middle position in the radial direction. The liquid medium chamber 121a is used to accommodate the rotor assembly of the electronic water pump and allow liquid medium to enter it.

[0032] The stator assembly 3 is provided with a circuit board fixing arm 311 .

[0033] The stator assembly 3 is accommodated and fixed in the electromechanical chamber 12 of the pump casing component 1 (the stator assembly 3 can be fixed in the electromechanical chamber 12 by means of screws, snaps or interference fit, etc.), and the circuit board fixing arm 311 of the stator assembly 3 is inserted into the circuit board fixing cavity 13 of the pump casing component 1.

[0034] The driving circuit board 2 is accommodated in the circuit board fixing cavity 13 of the pump housing component 1 , and the circuit board fixing arms 311 of the stator assembly 3 can fix the driving circuit board 2 in the circuit board fixing cavity 13 of the pump housing component 1 .

[0035] The driving circuit board 2 can exchange heat with the isolation bottom plate 11 of the pump housing component 1, and further exchange heat with the liquid medium in the liquid medium chamber 121a.

[0036] Specifically, the stator assembly 3 includes a stator bracket 31, a stator core 32, a stator winding 33 and a terminal 34; wherein the stator bracket 31 is a bracket component made of engineering plastic material, the stator core 32 is a solid metal component formed by stacking a number of silicon steel sheets, which has at least a yoke, a tooth portion and a boot portion, and the stator winding 33 is formed by winding a predetermined number of turns of enameled wire, and the terminal 34 is a metal terminal 34 with good conductive performance, which corresponds to the U phase, V phase and W phase of the stator winding 33; the circuit board fixing arm 311 is fixed / integrated at the stator bracket 31, and in this embodiment, the circuit board fixing arm 311 is a strip-shaped structural feature integrally formed at the stator bracket 31; at least a portion of the stator core 32 is wrapped and supported by the stator bracket 31, and in this embodiment, the stator bracket 3 1 is equipped with two stator brackets 31, which respectively wrap and support the end faces and teeth of the stator core 32 from the upper and lower sides (the outer side of the yoke and the inner wall of the boot of the stator core 32 are exposed). The two stator brackets 31 are interlocked and matched with each other, that is, the stator brackets 31 and the stator core 32 are fixed to each other; the stator winding 33 is wound around the teeth of the stator core 32 according to polarity; the terminal 34 is plugged and fixed to the stator bracket 31 and electrically connected to the stator winding 33. In fact, the terminal 34 is plugged and fixed to the terminal 34 slot of the stator bracket 31, and the end of the stator winding 33 is welded to the terminal 34 to achieve electrical connection between the stator winding 33 and the terminal 34; the terminal 34 of the stator assembly 3 is inserted into the circuit board fixing cavity 13 of the pump housing component 1 and is electrically connected to the drive circuit board 2.

[0037] Specifically, a snap-fitting through hole 111 is opened at the isolation bottom plate 11 of the pump casing component 1, and the snap-fitting through hole 111 is a hole-shaped structural feature integrally formed at the isolation bottom plate 11; the stator assembly 3 located in the electromechanical chamber 12 of the pump casing component 1, its circuit board fixing arm 311 passes through the snap-fitting through hole 111 of the isolation bottom plate 11 and enters the circuit board fixing cavity 13 of the pump casing component 1; the circuit board fixing arm 311 of the stator assembly 3 can apply force to the driving circuit board 2 from one side of the driving circuit board 2, and make the other side of the driving circuit board 2 rest against the isolation bottom plate 11 of the pump casing component 1 to snap-fit and fix the driving circuit board 2.

[0038] To be more specific, the circuit board fixing arm 311 of the stator assembly 3 has a guide surface 311a and a stop surface 311b formed at its end in sequence, wherein the guide surface 311a is an inclined surface that gradually shrinks from the root to the end, and the stop surface 311b is the bottom surface located at the root of the guide surface 311a; a fastening notch 21 is provided at the driving circuit board 2. In this embodiment, the fastening notch 21 is a groove-shaped notch integrally formed at the edge of the driving circuit board 2. In other embodiments, the fastening notch 21 can also be a through hole integrally formed at the driving circuit board 2; when the driving circuit board 2 is fastened and fixed, the guide surface 311a on the circuit board fixing arm 311 of the stator assembly 3 can be introduced into the fastening notch 21 of the driving circuit board 2 until the stop surface 311b on the circuit board fixing arm 311 passes through the fastening notch 21 of the driving circuit board 2; the stop surface 311b on the circuit board fixing arm 311 can apply force to the driving circuit board 2 from one side of the driving circuit board 2.

[0039] Furthermore, the circuit board fixing arm 311 of the stator assembly 3 has an end portion further inward of the locking surface 311b, and a limiting surface 311c is formed. Specifically, the limiting surface 311c is the end surface obtained after the circuit board fixing arm 311 is expanded; the limiting surface 311c of the stator assembly 3 is used to axially limit the relative position of the stator assembly 3 and the driving circuit board 2; and / or, the limiting surface 311c of the stator assembly 3 is used to axially limit the relative position of the stator assembly 3 and the pump casing component 1.

[0040] Specifically, a terminal through-hole 113 is provided at the isolation bottom plate 11 of the pump casing component 1, and the terminal through-hole 113 is a hole-shaped structural feature integrally formed at the isolation bottom plate 11; the stator assembly 3 located in the electromechanical chamber 12 of the pump casing component 1, its terminal 34 passes through the terminal through-hole 113 of the isolation bottom plate 11 and enters the circuit board fixing cavity 13 of the pump casing component 1; a terminal welding hole 22 is provided at the driving circuit board 2, and the terminal welding hole 22 is a copper-clad through-hole, which is electrically connected to the printed circuit on the driving circuit board 2; the terminal 34 of the stator assembly 3 is inserted into and welded to the terminal welding hole 22 of the driving circuit board 2, so that the terminal 34 of the stator assembly 3 is electrically connected to the driving circuit board 2.

[0041] Furthermore, a positioning protrusion 312 is formed on the stator bracket 31 of the stator assembly 3, and the positioning protrusion 312 is used to circumferentially limit the relative position of the stator core 32 and the stator bracket 31; specifically, the positioning protrusion 312 is a rib-like structural feature integrally formed at the end of the stator bracket 31, and a positioning groove is formed at the end of the stator core 32. The positioning protrusion 312 of the stator bracket 31 is inserted into the positioning groove of the stator core 32, which can circumferentially limit the relative position of the stator core 32 and the stator bracket 31, thereby realizing the installation positioning and anti-mistake of the stator core 32 and the stator bracket 31.

[0042] Furthermore, the isolation base plate 11 of the pump housing member 1 is formed with a component-shaped embedding groove 112 on one side of the circuit board fixing cavity 13, wherein the component-shaped embedding groove 112 is integrally formed on the isolation base plate 11 and has a groove-shaped structural feature that matches the shape of the components 23 (such as capacitors, inductors, field-effect transistors, etc.) on the driving circuit board 2; at least a portion of the components 23 of the driving circuit board 2 can be embedded in the component-shaped embedding groove 112 of the isolation base plate 11. In this way, the heat exchange area between the driving circuit board 2 and the isolation base plate 11 is increased, thereby improving the heat exchange efficiency between the driving circuit board 2 and the isolation base plate 11.

[0043] Furthermore, a heat-conducting medium is coated between the driving circuit board 2 and the isolation bottom plate 11 of the pump housing component 1 . In this embodiment, the heat-conducting medium is thermal grease.

[0044] The drive circuit board assembly and heat dissipation structure of the electronic water pump of this embodiment is assembled. When assembling, the pre-assembled stator assembly 3 is installed in the electromechanical chamber 12 of the pump housing component 1, so that the circuit board fixing arm 311 of the stator assembly 3 passes through the buckle through hole 111 of the isolation base plate 11 and enters the circuit board fixing cavity 13 of the pump housing component 1, and the terminal 34 of the stator assembly 3 passes through the terminal through hole 113 of the isolation base plate 11 and enters the circuit board fixing cavity 13 of the pump housing component 1. In some possible embodiments, the limiting surface 311c of the stator assembly 3 Press against the isolation base plate 11 to axially limit the relative position of the stator assembly 3 and the pump housing component 1; after coating the surface of the isolation base plate 11 / the drive circuit board 2 with a heat-conducting medium, align the mounting notch 21 of the drive circuit board 2 with the guide surface 311a on the circuit board fixing arm 311, and align the terminal welding hole 22 of the drive circuit board 2 with the terminal 34, install the drive circuit board 2 into the electromechanical chamber 12 of the pump housing component 1, press the drive circuit board 2, and guide the guide surface 311a on the circuit board fixing arm 311 into the mounting notch of the drive circuit board 2 21, at this time, the circuit board fixing arm 311 will undergo elastic deformation until the locking surface 311b on the circuit board fixing arm 311 passes through the fastening notch 21 of the driving circuit board 2 and reaches the side of the driving circuit board 2 away from the isolation base plate 11. At this time, the circuit board fixing arm 311 rebounds, so that the locking surface 311b on the circuit board fixing arm 311 can apply force to the driving circuit board 2 from one side of the driving circuit board 2 (i.e., the side away from the isolation base plate 11), and the other side of the driving circuit board 2 abuts against the isolation base plate 11 of the pump housing member 1, so as to prevent the driving circuit board 2 from being stuck in the pump housing member 1. In this way, the driver circuit board 2 can be fixed; finally, the terminal 34 of the stator assembly 3 needs to be welded to the terminal welding hole 22 of the driver circuit board 2 to electrically connect the terminal 34 of the stator assembly 3 to the driver circuit board 2; in the above process, the fastening notch 21 of the driver circuit board 2 can, on the one hand, be positioned relative to the circuit board fixing arm 311 of the stator assembly 3, and on the other hand, the guide surface 311a of the circuit board fixing arm 311 can be guided thereinto, that is, the fastening notch 21 of the driver circuit board 2 plays the role of positioning and installation and fixing at the same time.

[0045] It should be noted that the width of the fastening notch 21 of the driving circuit board 2 is L1, and the width of the guide surface 311a of the circuit board fixing arm 311 is L2, then L1-L2 should be 0.4mm~0.8mm to ensure that the guide surface 311a of the circuit board fixing arm 311 can smoothly penetrate the fastening notch 21 of the driving circuit board 2.

[0046] It should be noted that the gap between the inner wall of the pump casing component 1 and the circuit board fixing arm 311 is L3, and the deformation of the circuit board fixing arm 311 is L4, so L3-L4 should be greater than 0.2mm to avoid contact between the circuit board fixing arm 311 and the inner wall of the pump casing component 1 when the circuit board fixing arm 311 is deformed.

[0047] The drive circuit board assembly and heat dissipation structure of the electronic water pump of this embodiment, the circuit board fixing arm 311 of the stator assembly 3 can fix the drive circuit board 2 in the circuit board fixing cavity 13 of the pump casing member 1, so that the drive circuit board 2 can be fixed in the pump casing member 1 without screws, saving the material cost of screws and simplifying the assembly process of the drive circuit board 2. In addition, the circuit board fixing arm 311 of the stator assembly 3 can elastically support and fix the drive circuit board 2 to reduce the possibility of damage to the drive circuit board 2 and improve the reliability of the electronic water pump; an isolation bottom plate 11 is formed in the pump casing member 1, so that the dry and wet isolation plate is integrated into the pump casing member 1, and the drive circuit board 2 can be fixed to the pump casing The isolation base plate 11 of the component 1 undergoes heat exchange, and then exchanges heat with the liquid medium in the liquid medium chamber 121a, so that the driving circuit board 2 can obtain the liquid cooling and heat dissipation function while eliminating the material cost and assembly cost of the dry and wet isolation plate, thereby reducing the cost of the electronic water pump; furthermore, the circuit board fixing arm 311 of the stator assembly 3 can apply force to the driving circuit board 2 from one side of the driving circuit board 2, and make the other side of the driving circuit board 2 rest on the isolation base plate 11 of the pump housing component 1 to buckle and fix the driving circuit board 2, so that the driving circuit board 2 is tightly combined with the isolation base plate 11 of the pump housing component 1, thereby improving the heat exchange efficiency between the driving circuit board 2 and the isolation base plate 11.

[0048] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A drive circuit board assembly and heat dissipation structure for an electronic water pump, used in an electronic water pump; It is characterized by: The electronic water pump at least comprises a pump housing component, a drive circuit board and a stator assembly; An isolation bottom plate is formed in the pump housing component, and the isolation bottom plate separates the pump housing component into an electromechanical chamber and a circuit board fixing chamber, and the electromechanical chamber of the pump housing component is further separated into a liquid medium chamber; The stator assembly is provided with a circuit board fixing arm; The stator assembly is accommodated and fixed in the electromechanical chamber of the pump housing component, and the circuit board fixing arm of the stator assembly penetrates into the circuit board fixing cavity of the pump housing component; The driving circuit board is accommodated in the circuit board fixing cavity of the pump housing component, and the circuit board fixing arm of the stator assembly can fix the driving circuit board in the circuit board fixing cavity of the pump housing component; The driving circuit board can exchange heat with the isolation bottom plate of the pump housing component, and further exchange heat with the liquid medium in the liquid medium chamber.

2. The electronic water pump drive circuit board assembly and heat dissipation structure according to claim 1, characterized in that: The stator assembly includes a stator bracket, a stator core, a stator winding and a terminal; The circuit board fixing arm is fixed / integrated with the stator bracket; At least a portion of the stator core is wrapped and supported by the stator bracket; The stator winding is wound around the teeth of the stator core according to polarity; The terminal is plugged and fixed on the stator bracket and is electrically connected to the stator winding; The terminals of the stator assembly penetrate into the circuit board fixing cavity of the pump housing component and are electrically connected to the driving circuit board.

3. The driving circuit board assembly and heat dissipation structure of the electronic water pump according to claim 1 or 2, characterized in that: A buckle-mounting through hole is provided on the isolation bottom plate of the pump casing component; The stator assembly is located in the electromechanical chamber of the pump housing component, and its circuit board fixing arm passes through the buckling through hole of the isolation bottom plate and enters the circuit board fixing cavity of the pump housing component; The circuit board fixing arm of the stator assembly can apply force to the driving circuit board from one side of the driving circuit board and make the other side of the driving circuit board rest against the isolation bottom plate of the pump housing component to fasten and fix the driving circuit board.

4. The electronic water pump drive circuit board assembly and heat dissipation structure according to claim 3, characterized in that: The circuit board fixing arm of the stator assembly has a guide surface and a stop surface formed on its end in sequence; A buckling notch is provided on the driving circuit board; When the driving circuit board is fastened and fixed, the guide surface on the circuit board fixing arm of the stator assembly can be guided into the fastening notch of the driving circuit board until the locking surface on the circuit board fixing arm passes through the fastening notch of the driving circuit board; The stop surface on the circuit board fixing arm can apply force to the driving circuit board from one side of the driving circuit board.

5. The electronic water pump drive circuit board assembly and heat dissipation structure according to claim 3, characterized in that: The circuit board fixing arm of the stator assembly has an end portion located further inwardly of the stop surface, and also forms a limited position surface; The limiting surface of the stator assembly is used to axially limit the relative position of the stator assembly and the driving circuit board; And / or, the limiting surface of the stator assembly is used to axially limit the relative position of the stator assembly and the pump casing component.

6. The electronic water pump drive circuit board assembly and heat dissipation structure according to claim 2, characterized in that: A terminal through hole is provided at the isolation bottom plate of the pump housing component; A stator assembly is located in the electromechanical chamber of the pump housing component, and its terminals pass through the terminal through-holes of the isolation base plate and enter the circuit board fixing cavity of the pump housing component; The driving circuit board is provided with a terminal welding hole; The terminals of the stator assembly are inserted into and welded to the terminal welding holes of the driving circuit board, so that the terminals of the stator assembly are electrically connected to the driving circuit board.

7. The electronic water pump drive circuit board assembly and heat dissipation structure according to claim 2, characterized in that: A positioning protrusion is formed on the stator bracket of the stator assembly; The positioning protrusion is used to circumferentially limit the relative position of the stator core and the stator bracket.

8. The electronic water pump drive circuit board assembly and heat dissipation structure according to claim 1, characterized in that: The isolation bottom plate of the pump housing member is formed with a component-shaped embedding groove on one side of the circuit board fixing cavity; At least a portion of the components of the driving circuit board can be embedded in the component contoured embedding groove of the isolation base plate.

9. The driving circuit board assembly and heat dissipation structure of the electronic water pump according to claim 1 or 8, characterized in that: A heat-conducting medium is coated between the driving circuit board and the isolation bottom plate of the pump housing component.

Images