Electronic water pump applying PCB motor

Abstract

The utility model relates to the technical field of electronic water pumps, in particular to an electronic water pump applying a PCB motor, which comprises a water pump volute, a medium cavity is formed by the water pump volute and a motor shell assembly, a motor and an impeller assembly are arranged in the medium cavity, an electric control cavity is formed by the motor shell assembly and a heat dissipation cover, and a PCBA assembly is arranged in the electric control cavity. The motor and impeller assembly comprises a PCB stator fixed in the medium cavity, an impeller upper rotor injection molding assembly and a lower rotor injection molding assembly which are located on the upper side and the lower side of the PCB stator, and a three-phase terminal arranged on the PCB stator and connected with the PCBA assembly. An impeller on the impeller upper rotor injection molding assembly is matched with the interior of the water pump volute to form a working cavity. According to the electronic water pump, the PCB serves as a stator to be applied to the electronic water pump, the length of the electronic water pump is shortened, the weight of the electronic water pump is reduced, the electronic water pump is suitable for being arranged on a new energy automobile, and the flat appearance structure is beneficial to being arranged on a cooling module of an ICT data center.

Description

Technical Field

[0001] This utility model relates to the field of electronic water pump technology, specifically to an electronic water pump that uses a PCB motor. Background Technology

[0002] The electric water pump is the core of a vehicle's cooling system. Its function is to drive the circulation within the cooling system, ensuring that heat-generating components such as the motor and battery are cooled in a timely manner to guarantee the normal operation of the vehicle. Current electric water pumps are limited by their internal stator and rotor components, resulting in a large size and weight. This hinders their application in new energy vehicles, makes installation inconvenient, and prevents them from contributing to energy conservation in new energy vehicles. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model proposes an electronic water pump using a PCB motor.

[0004] The technical problem to be solved by this utility model is achieved by the following technical solution:

[0005] An electronic water pump using a PCB motor includes a water pump volute, a motor housing assembly, and a heat sink connected in sequence. The water pump volute and the motor housing assembly form a medium cavity and a motor and impeller assembly are disposed inside the cavity. The motor housing assembly and the heat sink assembly form an electronic control cavity and a PCBA assembly is disposed inside the cavity.

[0006] The motor and impeller assembly includes a PCB stator fixed in the medium cavity, an upper rotor injection molding assembly and a lower rotor injection molding assembly located on the upper and lower sides of the PCB stator, and a three-phase terminal set on the PCB stator and connected to the PCBA assembly. The impeller on the upper rotor injection molding assembly matches the inside of the water pump volute to form a working cavity.

[0007] The upper rotor injection molding assembly includes an impeller, an upper rotor injection molding assembly, and a sliding bearing;

[0008] A flow groove is provided on the inner wall of the sliding bearing, corresponding to the thrust surface inside the water pump casing. The flow groove, together with the medium cavity and the working cavity, forms a coolant circulation channel.

[0009] As a further improvement of this utility model, the motor and impeller assembly also includes an impeller cover, which is welded to the impeller to form a closed impeller.

[0010] As a further improvement of this utility model, the upper rotor injection molding assembly includes a rotor back plate and a magnet bonded together by adhesive, and a rotor plastic shell wrapped around the rotor back plate and the magnet.

[0011] As a further improvement of this utility model, the impeller, the upper rotor injection molding assembly and the sliding bearing are injection molded into one piece, and the lower rotor injection molding assembly and the sliding bearing are connected by interference fit.

[0012] As a further improvement of this utility model, the upper rotor injection molding assembly of the impeller also includes a steel bushing. The impeller, the upper rotor injection molding assembly and the steel bushing are integrated by injection molding. The sliding bearing is interference-fitted inside the steel bushing, and the lower rotor injection molding assembly is interference-fitted with the steel bushing.

[0013] As a further improvement of this utility model, the medium cavity is connected to the electrical control cavity, and the three-phase terminals extend into the electrical control cavity through the connection, and the connection is filled with sealant that matches the three-phase terminals.

[0014] As a further improvement of this utility model, a thrust washer for fixing the motor and impeller assembly is provided between the thrust surface inside the pump volute and the top of the motor shaft inside the motor housing assembly.

[0015] As a further improvement of this utility model, two first sealing rings are provided at the connection between the pump volute and the motor housing assembly, which contact the upper and lower end faces of the PCB stator.

[0016] As a further improvement of this utility model, a second sealing ring is provided between the connection between the motor housing assembly and the heat sink cover.

[0017] The beneficial effects of this utility model are:

[0018] This invention provides an electronic water pump using a PCB motor. By incorporating the PCB as the stator, the length and weight of the electronic water pump are significantly reduced, making it more suitable for installation in new energy vehicles, especially in the widely used thermal management integrated modules. Its lightweight characteristic contributes to energy conservation in automobiles, and its flat shape facilitates its placement in cooling modules of ICT data centers. Furthermore, by encasing the magnets in the rotor assembly in a plastic shell, the magnets are protected from coolant corrosion, greatly extending the motor's lifespan. By creating flow grooves on the inner wall of the sliding bearing and the thrust surface inside the pump volute, and cooperating with the medium cavity and working cavity to form a coolant circulation channel, the coolant can flow completely through the upper and lower rotors of the motor and the upper and lower surfaces of the PCB, providing uniform cooling and improving the motor's reliability. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] Figure 1 This is a schematic diagram of the overall internal structure of Embodiment 1 of this utility model;

[0021] Figure 2 This is an exploded structural diagram of Embodiment 1 of the present invention;

[0022] Figure 3 This is a cross-sectional view of the motor and impeller assembly in Embodiment 1 of this utility model;

[0023] Figure 4 This is an exploded structural diagram of the motor and impeller assembly in Embodiment 1 of this utility model;

[0024] Figure 5 This is a cross-sectional view of the rotor injection molding assembly on the impeller according to Embodiment 1 of this utility model;

[0025] Figure 6 This is a cross-sectional view of the motor and impeller assembly in Example 2 of this utility model;

[0026] Figure 7 This is an exploded structural diagram of the motor and impeller assembly in Example 2 of this utility model;

[0027] Figure 8 This is a cross-sectional view of the rotor injection molding assembly on the impeller according to Embodiment 2 of this utility model;

[0028] Figure 9 This is a schematic diagram of the external structure of the upper rotor injection molding assembly in this utility model;

[0029] Figure 10 This is a schematic diagram of the internal structure of the upper rotor injection molding assembly in this utility model;

[0030] Figure 11 This is a schematic diagram of the flow channel structure inside the water pump casing in this utility model;

[0031] Figure 12 This is a schematic diagram of the flow groove structure on the inner wall of the sliding bearing in this utility model;

[0032] Figure 13 This is a schematic diagram of the flow and circulation of coolant within the motor cavity (arrows indicate the flow direction).

[0033] In the diagram: 1. Pump volute; 2. Motor and impeller assembly; 21. Impeller cover; 22. Upper rotor injection molded assembly; 221. Impeller; 222. Upper rotor injection molded assembly; 2221. Rotor back plate; 2222. Magnet; 2223. Rotor plastic shell; 223. Sliding bearing; 224. Steel bushing; 23. PCB stator; 24. Lower rotor injection molded assembly; 25. Three-phase terminal; 3. Motor housing assembly; 4. PCBA assembly; 5. Heat sink cover; 6. Thrust gasket; 7. First sealing ring; 8. Second sealing ring; 9. Bolt; 10. Flow groove; 11. Sealant. Detailed Implementation

[0034] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0035] Example 1

[0036] like Figures 1 to 5 , Figures 9 to 12 As shown, an electronic water pump using a PCB motor comprises a water pump volute 1, a motor and impeller assembly 2, a motor housing assembly 3, a PCBA assembly 4, a heat sink 5, a thrust washer 6, a first sealing ring 7, a second sealing ring 8, and bolts 9.

[0037] The water pump volute 1 is an injection-molded part, and it is connected to the motor housing assembly 3 by welding to achieve reliable connection and sealing, forming a media cavity. The main body of the motor housing assembly 3 is also an injection-molded part, in which a motor shaft and connector terminals are embedded. A media cavity (wet cavity) and an electrical control cavity (dry cavity) are provided on the motor housing assembly 3, separating the two cavities. The motor and impeller assembly 2 is located within the media cavity and mounted on the motor shaft. The thrust washer 6 is mounted on the top of the motor shaft and mates with the internal thrust surface of the water pump volute 1 to axially limit the movement of the motor and impeller assembly 2. The heat dissipation cover 5 is connected to the motor housing assembly 3 by bolts 9, and a second sealing ring 8 is provided on the contact surface for sealing. The heat dissipation cover 5 is made of aluminum alloy with high thermal conductivity, and its function is to seal the electrical control cavity and conduct the heat generated by the PCBA assembly 4 during operation to the ambient air. Multiple heat dissipation fins are provided on the heat dissipation cover 5 to improve the heat transfer rate. The gap between the heat sink 5 and the PCBA assembly 4 is filled with thermally conductive insulating adhesive to compensate for manufacturing and assembly tolerances and conduct heat from the PCBA assembly 4.

[0038] The pump volute 1 has a vortex channel inside it, which matches the impeller 221 on the motor and impeller assembly 2 to form a working chamber, thereby realizing the pressurization and flow of the common medium.

[0039] Furthermore, the motor and impeller assembly 2 includes an impeller cover 21, an upper rotor injection molding assembly 22, a PCB stator 23, a lower rotor injection molding assembly 24, and three-phase terminals 25. The upper rotor injection molding assembly 22 is composed of an impeller 221, an upper rotor injection molding assembly 222, and a sliding bearing 223.

[0040] The impeller cover 21 is an injection-molded part, and the impeller 221 in the rotor injection-molded assembly 22 on the impeller is formed by ultrasonic welding to form a closed impeller.

[0041] The impeller 221, upper rotor injection molding assembly 222, and sliding bearing 223 in the impeller upper rotor injection molding assembly 22 are integrally formed by injection molding. The sliding bearing 223 is an iron-based bearing, which, as a structural component, has sufficient strength to connect the impeller upper rotor injection molding assembly 22 and the lower rotor injection molding assembly 24. It also accommodates the function of the sliding bearing and the rotation and friction between the motor shaft. Furthermore, the inner wall of the sliding bearing 223 is provided with a flow groove 10 corresponding to the thrust surface inside the water pump volute 1. The flow groove 10 cooperates with the medium cavity and the working cavity to form a coolant circulation channel. Figure 13 The diagram shown is a schematic of the flow and circulation of coolant within the motor cavity.

[0042] Furthermore, the upper rotor injection molding assembly 222 includes a rotor back plate 2221, a magnet 2222, and a rotor housing 2223. The rotor back plate 2221 and the magnet 2222 are bonded together with adhesive. The rotor housing 2223 covers the magnet 2222 to protect it from corrosion. To ensure effective sealing and protection of the magnet 2222 during injection molding, sealing ribs are provided on both sides of the rotor housing 2223, so that the upper rotor injection molding assembly 222 embedded in the impeller can be effectively fused with the impeller 221 during injection molding, achieving a seal.

[0043] The PCB stator 23 contains multiple short-circuit boards, and a ring coil, i.e., a stator coil, is formed on each board through an etching process. Three terminals are soldered onto the PCB stator 23, which are respectively connected to the three-phase terminals 25.

[0044] The lower rotor injection molding assembly 24 also includes a rotor back plate, magnets, and a rotor housing, as well as a bushing. Similar to the upper rotor injection molding assembly 222, the rotor back plate and magnets in the lower rotor injection molding assembly 24 are bonded together with adhesive, and the rotor back plate and bushing are fitted with an interference fit. The bushing in the lower rotor injection molding assembly 24 is fitted with an interference fit to the sliding bearing 223 in the upper rotor injection molding assembly 22, thereby achieving connection and torque transmission.

[0045] The medium cavity on the motor housing assembly 3 is connected to the electrical control cavity. The three-phase terminal 25 extends into the electrical control cavity through the connection. To prevent the coolant in the medium cavity from entering the electrical control cavity, a first sealing ring 7 is provided above and below the position of the three-phase terminal 25. The connection is filled with sealant 11 that matches the three-phase terminal 25.

[0046] Example 2

[0047] The difference from Example 1 is that, as Figures 6 to 8As shown, the upper rotor injection molding assembly 22 of the impeller is composed of an impeller 221, an upper rotor injection molding assembly 222, a sliding bearing 223, and a steel bushing 224.

[0048] The impeller 221, upper rotor injection molding assembly 222, and steel bushing 224 in the impeller upper rotor injection molding assembly 22 are integrally formed by injection molding. The steel bushing 224, as a structural component, has sufficient strength to connect the impeller upper rotor injection molding assembly 22 and the lower rotor injection molding assembly 24. Furthermore, the sliding bearing 223 is internally interference-fitted with the steel bushing 224, and the lower rotor injection molding assembly 24 is externally interference-fitted with the steel bushing 224.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An electronic water pump using a PCB motor, comprising a water pump volute (1), a motor housing assembly (3), and a heat sink (5) connected in sequence, wherein the water pump volute (1) and the motor housing assembly (3) form a medium cavity and a motor and impeller assembly (2) are disposed inside the cavity, and the motor housing assembly (3) and the heat sink (5) form an electronic control cavity and a PCBA assembly (4) is disposed inside the cavity; characterized in that: The motor and impeller assembly (2) includes a PCB stator (23) fixed in the medium cavity, an upper rotor injection molding assembly (22) and a lower rotor injection molding assembly (24) located on the upper and lower sides of the PCB stator (23), and a three-phase terminal (25) set on the PCB stator (23) and connected to the PCBA assembly (4). The impeller (221) on the upper rotor injection molding assembly (22) matches the inside of the pump volute (1) to form a working cavity. The impeller upper rotor injection molding assembly (22) includes an impeller (221), an upper rotor injection molding assembly (222), and a sliding bearing (223); A flow groove (10) is provided on the inner wall of the sliding bearing (223) corresponding to the thrust surface inside the water pump volute (1). The flow groove (10) cooperates with the medium cavity and the working cavity to form a coolant circulation channel.

2. The electronic water pump using a PCB motor according to claim 1, characterized in that: The motor and impeller assembly (2) also includes an impeller cover (21), which is welded to the impeller (221) to form a closed impeller.

3. An electronic water pump using a PCB motor according to claim 1, characterized in that: The upper rotor injection molding assembly (222) includes a rotor back plate (2221) and a magnet (2222) bonded together by adhesive, and a rotor housing (2223) wrapped around the rotor back plate (2221) and the magnet (2222).

4. An electronic water pump using a PCB motor according to claim 1, characterized in that: The impeller (221), the upper rotor injection molding assembly (222) and the sliding bearing (223) are injection molded into one piece, and the lower rotor injection molding assembly (24) is interference-fitted with the sliding bearing (223).

5. An electronic water pump using a PCB motor according to claim 1, characterized in that: The upper rotor injection molding assembly (22) of the impeller also includes a steel bushing (224). The impeller (221), the upper rotor injection molding assembly (222) and the steel bushing (224) are injection molded into one piece. The sliding bearing (223) is interference-fitted inside the steel bushing (224). The lower rotor injection molding assembly (24) is interference-fitted with the steel bushing (224).

6. An electronic water pump using a PCB motor according to claim 1, characterized in that: The medium cavity is connected to the electrical control cavity, and the three-phase terminals (25) extend into the electrical control cavity through the connection. The connection is filled with sealant (11) that matches the three-phase terminals (25).

7. An electronic water pump using a PCB motor according to claim 1, characterized in that: A thrust washer (6) for fixing the motor and impeller assembly (2) is provided between the internal thrust surface of the pump volute (1) and the top of the motor shaft inside the motor housing assembly (3).

8. An electronic water pump using a PCB motor according to claim 1, characterized in that: Two first sealing rings (7) are provided at the connection between the pump volute (1) and the motor housing assembly (3) to contact the upper and lower end faces of the PCB stator (23).

9. An electronic water pump using a PCB motor according to claim 1, characterized in that: A second sealing ring (8) is provided between the connection between the motor housing assembly (3) and the heat sink cover (5).

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