An electric water pump

Abstract

The utility model discloses an electric water pump, including casing and electric control component, the casing is equipped with the rotor cavity along the first direction extension and with the rotor cavity abutted and the watertight isolation electric control cavity, the electric control cavity is equipped with the electric control chamber and the containing chamber who arranges along the first direction and communicates each other, and the electric control chamber is arranged in the rotor cavity along the first direction one end, and the containing chamber radial encircles the outer periphery of rotor cavity, the electric control component is placed in the electric control cavity and is equipped with the electric control board and with the electric control board fixedly connected at least one first electrical component, and the electric control board is arranged in the electric control chamber, and the first electrical component at least partial intrudes in the containing chamber. The present application can reduce the axial dimension of electric control chamber to reduce the occupied space of electric water pump along the first direction, is favorable to the miniaturization design of electric water pump.

Description

Technical Field

[0001] This utility model relates to the field of water pumps, specifically to an electric water pump. Background Technology

[0002] Electric water pumps are widely used in the automotive industry's thermal management water circulation systems. An electric water pump generally includes a housing, pump shaft, brushless motor, control board, and impeller. The housing has an impeller cavity, rotor cavity, and control chamber arranged sequentially along its axial direction. The housing also has an inlet and outlet connected to the impeller cavity. The impeller cavity and rotor cavity are axially connected, while the control chamber is isolated from the rotor cavity. The pump shaft extends axially and enters both the impeller and rotor cavities. The impeller is placed in the impeller cavity and rotates relative to the pump shaft. The rotor of the brushless motor is placed in the rotor cavity and fixedly connected to the impeller. The stator of the brushless motor is arranged around the rotor cavity and fixedly connected to the housing. The control board, used to control the current flow in the stator windings, is located within the control chamber. The rotor and impeller are integrally fixed and driven by the brushless motor, causing water to flow from the inlet through the impeller and out the outlet.

[0003] In existing technologies, the electrical control chamber of an electric water pump, in addition to the control board, also needs to accommodate essential circuit components such as inductors and capacitors. These key components (especially the large power inductors and electrolytic capacitors) occupy a significant amount of axial space in the limited electrical control chamber due to their large physical dimensions, particularly their considerable axial dimensions. The inherent size limitations of these components directly necessitate a larger axial space in the overall electrical control chamber to meet installation requirements, which significantly increases the axial dimensions of the electric water pump. Utility Model Content

[0004] The purpose of this utility model is to overcome the above-mentioned defects or problems in the background art and provide an electric water pump that can reduce the axial dimension of the electrical control room, thereby reducing the space occupied by the electric water pump along the first direction, which is beneficial to the miniaturization design of the electric water pump.

[0005] To achieve the above objectives, the present invention and its preferred embodiments adopt the following technical solutions, but the embodiments are not limited to the following solutions:

[0006] Technical solution one and its preferred embodiment provide an electric water pump, including a housing, which has a rotor cavity extending along a first direction and an electrical control cavity adjacent to and watertight from the rotor cavity. The electrical control cavity has an electrical control chamber and a receiving chamber that are interconnected and arranged along the first direction. The electrical control chamber is located at one end of the rotor cavity along the first direction, and the receiving chamber is radially surrounding the outer periphery of the rotor cavity. An electrical control assembly is placed in the electrical control cavity and has an electrical control board and at least one first electrical component fixedly connected to the electrical control board. The electrical control board is located in the electrical control chamber, and the first electrical component at least partially extends into the receiving chamber.

[0007] Based on technical solution one, there is also technical solution two. In technical solution two and its related embodiments, the first electrical component is fixed to the side of the control board facing the rotor cavity.

[0008] Based on technical solution two, there is also technical solution three. In technical solution three and its related embodiments, the electronic control component is further provided with at least two second electrical components fixed to the side of the electronic control board away from the rotor cavity, and the height of each second electrical component along the first direction is less than the height of the first electrical component along the first direction.

[0009] Based on technical solution two, there is also technical solution four. In technical solution four and its related embodiments, the number of the first electrical components is at least two, and at least one is a capacitor and at least one is an inductor. The electronic control component is also provided with limiting components that are equal to and correspond one-to-one with the number of capacitors. The limiting components are fixed to the side of the electronic control board near the first heat-conducting wall and are radially limited and matched with the corresponding capacitors.

[0010] Based on technical solution three, there is also technical solution five. In technical solution five and its related embodiments, the cavity wall between the rotor cavity and the electrical control chamber is provided with a first heat-conducting wall perpendicular to the first direction, and the projections of the second electrical component and the first heat-conducting wall on the projection plane perpendicular to the first direction at least partially overlap; the electrical control board is attached to the first heat-conducting wall.

[0011] Based on technical solution five, there is also technical solution six. In technical solution six and its related embodiments, a second heat-conducting layer is sandwiched between the electronic control board and the first heat-conducting wall.

[0012] Based on technical solution one, there is also technical solution seven. In technical solution seven and its related embodiments, the cavity wall between the rotor cavity and the receiving chamber is provided with a second heat-conducting wall, and a first heat-conducting layer is provided between the first electrical component and the second heat-conducting wall.

[0013] Based on any one of technical solutions one to seven, there is also a technical solution eight. In technical solution eight and its related embodiments, the housing includes an upper housing, a middle housing and a lower housing. The upper housing and the middle housing are watertightly connected, the lower housing and the middle housing are fixedly connected, the rotor cavity is formed in the middle housing, and the middle housing and the lower housing enclose an electrical control cavity.

[0014] Based on technical solution eight, technical solution nine is also provided. Technical solution nine and its related embodiments further include a pump shaft, a rotating assembly, and a stator; the upper housing has an impeller cavity, an inlet, and an outlet; the rotor cavity and the impeller cavity are connected along a first direction; the electrical control chamber is located away from the impeller cavity along the first direction; the pump shaft extends along the first direction with its two ends located in the impeller cavity and the rotor cavity respectively, and the pump shaft has a water passage along its extension direction; the rotating assembly includes a rotor and an impeller, the rotor is located in the rotor cavity and rotatably connected to the pump shaft, the impeller is located in the impeller cavity and fixedly connected to the rotor, a high-pressure zone is formed between the impeller and the cavity wall of the impeller cavity, the high-pressure zone is connected to a low-pressure zone near the inlet through the rotor cavity and the water passage; the side cavity wall of the rotor cavity forms a third heat-conducting wall, a water passage gap is formed between the third heat-conducting wall and the rotor, the water passage gap is used to connect the high-pressure zone and the water passage; the stator is fixedly connected to the housing and surrounds the rotor cavity; the electrical control board is electrically connected to the stator to control the stator.

[0015] Based on technical solution nine, technical solution ten is also provided. In technical solution ten and its related embodiments, the stator is further provided with a connecting terminal extending into the receiving chamber, and the electronic control board is provided with a connecting hole corresponding to the connecting terminal; the middle housing is further provided with a positioning post extending out of the receiving chamber corresponding to the receiving chamber, and the electronic control board is provided with a positioning hole adapted to the positioning post.

[0016] As can be seen from the above description of the present invention and its preferred embodiments, compared with the prior art, the technical solution of the present invention and its preferred embodiments have the following beneficial effects due to the adoption of the following technical means:

[0017] In technical solution one and its preferred embodiment, the electrical control cavity includes an electrical control chamber and a receiving chamber that are interconnected and arranged along a first direction. The receiving chamber radially surrounds the outer periphery of the rotor cavity. At least a portion of the first electrical component extends into the receiving chamber, making full use of the unused space outside the rotor cavity to accommodate the first electrical component. In practical applications, the first electrical component generally has a large physical size and generates a large amount of heat. The fact that at least a portion of the first electrical component extends into the receiving chamber can significantly reduce the axial height of the electrical control assembly within the electrical control chamber, allowing the electrical control chamber to have a smaller axial dimension. This results in a smaller space occupied by the electric water pump along the first direction, which is beneficial for the miniaturization design of the electric water pump. Since the stator of the brushless motor in the prior art is arranged around the rotor cavity and fixed to the housing, the arrangement of the receiving chamber does not require modification to the housing structure, resulting in minimal changes and low modification costs. Furthermore, since the receiving chamber radially surrounds the outer periphery of the rotor cavity, the heat generated by the first electrical component during operation can be transferred to the rotor cavity and carried away by the coolant flowing within the rotor cavity. This allows the heat generated by the first electrical component, which generates a large amount of heat, to be quickly dissipated, thereby improving the heat dissipation efficiency of the electrical control assembly.

[0018] In the second technical solution and its preferred embodiment, the first electrical component is fixed to the side of the control board facing the rotor cavity. Compared with the solution where the first electrical component penetrates through the control board, the first electrical component extends into the receiving chamber in a larger portion, which is more conducive to reducing the axial dimension of the control chamber.

[0019] In the third technical solution and its preferred embodiment, the electronic control assembly is further provided with at least two second electrical components fixed to the side of the electronic control board away from the rotor cavity. The height of the second electrical components along the first direction is less than the height of the first electrical components along the first direction. With this arrangement, electrical components can be fixed to both sides of the electronic control board. Compared with the solution of fixing electrical components to only one side of the electronic control board, it is more conducive to reducing the area of ​​the electronic control board, thereby reducing the space of the electronic control cavity in the radial direction, and further facilitating the miniaturization design of the electric water pump.

[0020] In the fourth technical solution and its preferred embodiment, the number of first electrical components is at least two, and at least one is a capacitor and at least one is an inductor. The electronic control component is also provided with limiting components that are equal in number and correspond one-to-one with the number of capacitors. The limiting components are fixed to the side of the electronic control board near the first heat-conducting wall and cooperate with the corresponding capacitors in a radial limiting manner, which can reduce the vibration of the capacitors, thereby avoiding damage to the capacitors due to vibration, improving the service life of the capacitors, and ensuring the stable operation of the electronic control component.

[0021] In technical solution five and its preferred embodiments, the electronic control board is attached to the first heat-conducting wall, so that the heat of the electronic control board can be quickly transferred to the first heat-conducting wall. The heat of the electronic control board mainly comes from the first electrical component and the second electrical component. That is, the heat of the first electrical component and the second electrical component can be indirectly transferred to the first heat-conducting wall through the electronic control board. The projections of the second electrical component and the first heat-conducting wall on the projection plane perpendicular to the first direction overlap at least partially, which is more conducive to the rapid transfer of the heat of the second electrical component to the first heat-conducting wall. There is coolant flowing in the rotor cavity of the electric water pump. The heat transferred to the first heat-conducting wall is quickly carried away by the flowing coolant, thereby improving the heat dissipation efficiency of the electronic control component, ensuring the stable operation of the electronic control component, and the heat dissipation cost is low.

[0022] In technical solution six and its preferred embodiments, a second thermally conductive layer is also sandwiched between the electronic control board and the first thermally conductive wall, which is conducive to the rapid transfer of heat from the electronic control board to the first thermally conductive wall, thereby improving the heat exchange efficiency of the electronic control component. In practical applications, the second thermally conductive layer is often formed by thermally conductive adhesive, so the second thermally conductive layer can also reduce the vibration of the electronic control board and ensure the stable operation of the electronic control component.

[0023] In the seventh technical solution and its preferred embodiment, a first thermally conductive layer is provided between the first electrical component and the second thermally conductive wall, which is conducive to the rapid transfer of heat from the first electrical component to the second thermally conductive wall, thereby improving the heat exchange efficiency of the first electrical component. In practical applications, the first thermally conductive layer is often formed by thermally conductive adhesive, so the first thermally conductive layer can also reduce the vibration of the first electrical component and prevent the first electrical component from being damaged by impact.

[0024] In technical solution nine and its preferred embodiments, a water passage is provided along the extension direction of the pump shaft. The high-pressure area is connected to the low-pressure area through the rotor cavity via the water passage, which can establish an internal circulation cooling channel inside the electric water pump. Water flows from the high-pressure area to the low-pressure area through the internal circulation cooling channel to form an internal circulation cooling water flow, which is beneficial for heat dissipation of the stator and the electronic control board. Although the internal circulation cooling water flow may reduce the operating efficiency of the electric water pump, effective heat dissipation can improve the service life of the electric water pump. A water passage gap is formed between the third heat-conducting wall and the rotor. The internal circulation cooling water flows through the water passage gap, making it easier to carry away the heat generated by the stator enameled wire winding during the operation of the electric water pump.

[0025] In the tenth technical solution and its preferred embodiment, the stator is further provided with a connecting terminal extending into the receiving chamber, and the electronic control board is provided with a connecting hole corresponding to the connecting terminal; the middle housing is further provided with a positioning post extending out of the receiving chamber corresponding to the receiving chamber, and the electronic control board is provided with a positioning hole adapted to the positioning post, which is conducive to the rapid installation of the electronic control components. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a top view of the electric water pump according to an embodiment of the present invention;

[0028] Figure 2 for Figure 1 Sectional view along the AA direction;

[0029] Figure 3 This is an exploded perspective view of the electric water pump according to an embodiment of the present utility model;

[0030] Figure 4 This is a top view of the electronic control component according to an embodiment of the present invention.

[0031] Explanation of key figure labels:

[0032] Housing 10; Upper housing 11; Bolt hole 111; Middle housing 12; Through hole 121; Annular groove 122; Lower housing 13; Insertion part 131; Abutment wall 132; Third heat-conducting wall 14; Positioning post 15; First heat-conducting wall 16; Second heat-conducting wall 17; Impeller cavity 01; Rotor cavity 02; Electrical control cavity 03; Electrical control chamber 04; Receiving chamber 05; Pump shaft 20; Water passage 21; Impeller 30; Rotor 40; Stator 50; Connecting terminal 51; Electrical control board 60; Connecting hole 61; Positioning hole 62; First electrical component 70; Capacitor 71; Inductor 72; Second electrical component 73; Limiting component 80; First heat-conducting layer 91; Second heat-conducting layer 92. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are preferred embodiments of the present utility model and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0034] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.

[0035] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this utility model, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing this utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific protection scope of this utility model.

[0036] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.

[0037] In the claims, description and accompanying drawings of this utility model, the terms "comprising", "having", and variations thereof are used to mean "including but not limited to".

[0038] Unless otherwise specified in the claims and description, the term "stator" includes not only the stator as understood by a person skilled in the art, but also the windings. That is, the stator includes a stator section and a winding section.

[0039] Unless otherwise specified in the claims and description, the term "watertight" refers to a liquid seal, which is commonly known to those skilled in the art to be achieved by conventional means such as sealing rings or sealing cups.

[0040] Unless otherwise specified in the claims and description, the term "insert injection molding" refers to a process in which two parts are tightly joined together and cannot be disassembled after injection molding by inserting components during the injection process.

[0041] Unless otherwise specified in the claims and description, the term "attached" means that the two are in close contact or indirectly (e.g., through a thermally conductive material) attached to each other.

[0042] Unless otherwise specified in the claims and description, the term "radial limit" refers to a restriction on movement in a direction perpendicular to the axis of rotation, including not only preventing movement but also limiting the degree of movement.

[0043] Unless otherwise specified in the claims and description, “first direction” refers to the direction in which the pump shaft extends.

[0044] See Figure 1-2 , Figure 1 An electric water pump is shown, which includes a housing 10, a pump shaft 20, a rotating assembly, a stator 50, and an electrical control board 60.

[0045] like Figure 2 As shown, the housing 10 includes an upper housing 11, a middle housing 12, and a lower housing 13.

[0046] like Figure 2As shown, the upper housing 11 has an impeller cavity 01, an inlet, and an outlet. The impeller cavity 01 opens downwards, the inlet connects to the top of the impeller cavity 01 along a first direction, and the outlet connects tangentially to the impeller cavity 01. The middle housing 12 has a rotor cavity 02 extending along the first direction. The rotor cavity 02 opens upwards and has side walls, which form a third heat-conducting wall 14. The upper housing 11 and the middle housing 12 are watertightly connected by a sealing ring and bolts. After the upper housing 11 and the middle housing 12 are fixedly connected, the impeller cavity 01 connects to the rotor cavity 02 along the first direction. The lower housing 13 is welded to the middle housing 12. After the lower housing 13 and the middle housing 12 are fixedly connected, they enclose an electrical control cavity 03. The electrical control cavity 03 is adjacent to the rotor cavity 02 and moves away from the impeller cavity 01 along the first direction. The rotor cavity 02 and the electrical control cavity 03 are watertightly separated by a partition wall. The electrical control cavity 03 has an electrical control chamber 04 and a receiving chamber 05 that are interconnected and arranged along a first direction. The electrical control chamber 04 is located at one end of the rotor cavity 02 along the first direction, and the receiving chamber 05 radially surrounds the outer periphery of the rotor cavity 02. The electrical control chamber 04 is located away from the impeller cavity 01 along the first direction. (See also...) Figure 3 The middle shell 12 is also provided with a positioning post 15 extending out of the receiving chamber 05. Figure 2 In the middle, the partition wall is provided with a first heat-conducting wall 16 perpendicular to the first direction and a second heat-conducting wall 17 surrounding the rotor cavity 02. That is, the cavity wall between the rotor cavity 02 and the electrical control chamber 04 is provided with a first heat-conducting wall 16 perpendicular to the first direction, and the cavity wall between the rotor cavity 02 and the receiving chamber 05 is provided with a second heat-conducting wall 17.

[0047] like Figure 2 As shown, the pump shaft 20 extends along a first direction, with its two ends located in the impeller cavity 01 and the rotor cavity 02, respectively. The first end of the pump shaft 20 extends into the impeller cavity 01 and faces the water inlet along the first direction, while the second end of the pump shaft 20 extends into the rotor cavity 02. In this embodiment, the pump shaft 20 is fixed relative to the housing 10, and the pump shaft 20 is provided with a water passage 21 that runs through the entire pump shaft 20 along its extension direction.

[0048] The rotating components include, but are not limited to, the impeller 30 and the rotor 40.

[0049] like Figure 2As shown, the impeller 30 rotates relative to the pump shaft 20 within the impeller cavity 01, about the rotation axis defined by the pump shaft 20. The impeller 30 is fixedly connected to the rotor 40, allowing the brushless motor formed by the rotor 40 and stator 50 to drive the impeller 30 to rotate about the pump shaft 20 within the impeller cavity 01. The electric water pump pressurizes the water or liquid flow input from the inlet and outputs it to the outlet through the rotation of the impeller 30. In this embodiment, when the impeller 30 rotates in the impeller cavity 01, a high-pressure zone is formed between the impeller 30 and the cavity wall of the impeller cavity 01. Specifically, there is a gap between the outer edge of the impeller 30 and the side cavity wall of the impeller cavity 01, and this gap forms the high-pressure zone. Correspondingly, when the impeller 30 rotates in the impeller cavity 01, a low-pressure zone is formed in the area near the inlet. The high-pressure zone is connected to the low-pressure zone near the inlet through the rotor cavity 02 and the water passage 21. When the electric water pump is used to establish the circulating water flow, the rotation of the impeller 30 causes the pressure at the outlet to be higher than the pressure at the inlet, so that the circulating water pump flows back from the outlet pump outlet to the inlet.

[0050] like Figure 2 As shown, rotor 40 is located in rotor cavity 02 and rotatably connected to pump shaft 20. A water passage gap is formed between rotor 40 and third heat-conducting wall 14, which is used to connect the high-pressure area and water passage 21. It should be understood that in this embodiment, pump shaft 20 is fixed relative to housing 10, and rotating assembly rotates relative to pump shaft 20. However, in other embodiments, pump shaft 20 can rotate relative to housing 10, and pump shaft 20 can rotate synchronously with rotating assembly.

[0051] like Figure 2 As shown, the stator 50 is fixedly connected to the intermediate housing 12 and surrounds the rotor cavity 02, and the intermediate housing 12 also surrounds the stator 50. The stator 50 and the rotor cavity 02 are watertight. Figure 3 As shown, the stator 50 is also provided with a connection terminal 51 that extends into the receiving chamber 05. The rotor 40 and the stator 50 together constitute a brushless motor.

[0052] like Figure 3 As shown, the electrical control assembly is placed inside the electrical control cavity 03 and includes an electrical control board 60, at least one first electrical component 70, at least two second electrical components 73, and several limiting components 80. The first and second electrical components 70 are both fixedly connected to the electrical control board 60. The electrical control board 60 is located inside the electrical control chamber 04 and abuts against the first heat-conducting wall 16. In this embodiment, the area of ​​the electrical control board 60 corresponding to the first heat-conducting wall 16 is copper-clad, and the area of ​​the electrical control board 60 corresponding to the receiving chamber 05 is also copper-clad. For ease of installation, the electrical control board 60 also includes a connection hole 61 corresponding to the connection terminal 51 and a positioning hole 62 adapted to the positioning post 15. In this embodiment, as shown... Figure 2 and 4As shown, the first electrical component 70 is fixed to the side of the control board 60 facing the rotor cavity 02. The first electrical component 70 extends at least partially into the receiving chamber 05. There are at least two first electrical components 70, at least one of which is a capacitor 71 and at least one is an inductor 72. The number of limiting components 80 is equal to the number of capacitors 71 and corresponds one-to-one. That is, the control assembly also has limiting components 80 that are equal to the number of capacitors 71 and correspond one-to-one. The limiting components 80 are fixed to the side of the control board 60 near the first heat-conducting wall 16 and are radially limited and matched with the corresponding capacitors 71. In actual installation, the limiting components 80 can be fixed to the capacitors 71 first and then fixed to the control board 60. The second electrical component 73 is fixed to the side of the control board 60 away from the rotor cavity 02. The height of each second electrical component 73 along the first direction is less than the height of the first electrical component along the first direction, and the number of second electrical components 73 is greater than the number of first electrical components. The projections of the second electrical components 73 and the first heat-conducting wall 16 on the projection plane perpendicular to the first direction at least partially overlap. The area corresponding to the first heat-conducting wall 16 on the electronic control board 60 is copper-plated. The electronic control board 60 and the first heat-conducting wall 16 are in close contact, which allows the copper-plated area of ​​the electronic control board 60 and the first heat-conducting wall 16 to form a rapid heat conduction channel. Therefore, the heat of the electrical components can be quickly transferred to the area corresponding to the first heat-conducting wall 16 on the electronic control board 60 through the copper plating, and then quickly transferred to the electronic control board 60. Meanwhile, there is coolant flowing in the rotor cavity 02 of the electric water pump. The heat transferred to the first heat-conducting wall 16 is quickly carried away by the flowing coolant, thereby improving the heat dissipation efficiency of the electronic control components, ensuring the stable operation of the electronic control components, and reducing the heat dissipation cost. The area of ​​the electronic control board 60 corresponding to the receiving chamber 05 is copper-plated. The heat of the first electrical component 70 can be quickly transferred to the first heat-conducting wall 16 through the copper-plated area. On the other hand, it can also be transferred directly (to the second heat-conducting wall 17) or indirectly (with air as the medium) to the second heat-conducting wall 17. The heat transferred to the first heat-conducting wall 16 and the second heat-conducting wall 17 is quickly carried away by the flowing coolant. This allows the heat of the first electrical component 70, which generates a large amount of heat, to be quickly carried away, thereby improving the heat dissipation efficiency of the electronic control component and ensuring the stable operation of the electronic control component.

[0053] The control board 60 is electrically connected to the connection terminal 51 of the stator 50 to control the conduction of the winding current in the stator 50, thereby enabling the brushless motor to start, stop, and adjust its speed. As is well known to those skilled in the art, the control board 60 is also connected to external terminals via leads passing through the lower housing 13 to obtain power and control signals from the outside.

[0054] In this embodiment, a first thermally conductive layer 91 is provided between the first electrical component 70 and the second thermally conductive wall 17, and a second thermally conductive layer 92 is sandwiched between the control board 60 and the first thermally conductive wall 16. However, it should be understood that in other embodiments, due to the good thermal conductivity of the control board 60, the first thermally conductive layer 91 and the second thermally conductive layer 92 may be omitted to reduce costs. In this embodiment, both the first thermally conductive layer 91 and the second thermally conductive layer 92 are thermally conductive silicone.

[0055] like Figure 2 As shown, the electric water pump in this embodiment forms a main water flow and an internal circulating cooling water flow during operation. The main water flow, consistent with existing technology, refers to the water flow that enters the impeller cavity 01 from the inlet and is pumped out by the impeller 30 to the outlet. As mentioned above, during the rotation of the impeller 30, a high-pressure zone is formed on the outer edge of the impeller 30. In this embodiment, the high-pressure zone is located in the gap between the outer edge of the impeller 30 and the side wall of the impeller cavity 01. The water flow from the high-pressure zone, through the water passage gap, rotor cavity 02, and water passage 21, flows to the low-pressure zone and merges with the main water flow. The low-pressure zone is located near the inlet, thus forming an internal circulating cooling water flow. However, the internal circulating cooling water flow exchanges liquid with the main water flow. As mentioned above, since the stator 50 is surrounded by the rotor cavity 02, and the stator 50 is generally adjacent to or against the third heat-conducting wall 14, the water flow passing through the water passage gap can carry away the heat generated by the stator 50 during the operation of the electric water pump. As described above, the heat generated by the electronic control components during operation can be transferred to the first heat-conducting wall 16 and the second heat-conducting wall 17, and the heat can be carried away by the water flow that is about to enter the second end of the pump shaft 20.

[0056] In general, during the assembly of an electric water pump, the stator 50 and the middle housing 12 are integrally molded using insert injection molding. The rotating component is placed inside the middle housing 12, and then the upper housing 11 is watertightly fixed to the middle housing 12. However, during the assembly of the electrical control component, it is inserted from the opening on the side of the middle housing 12 away from the upper housing 11, and the lower housing 13 is then watertightly fixed to the middle housing 12. This means that the orientation of the housing 10 needs to be adjusted during assembly, causing inconvenience to on-site personnel. In this embodiment, to improve this problem, such as... Figure 3As shown, bolt holes 111 with openings facing the lower housing 13 are provided on the upper housing 11 for bolt fixing, and through holes 121 corresponding to the bolt holes 111 are provided on the middle housing 12. Therefore, during installation, the insertion direction of the electrical control components is consistent with the insertion direction of the bolts, which facilitates installation. In this embodiment, for ease of installation, an annular groove 122 is provided on the opening side of the middle housing 12 near the lower housing 13. The lower housing 13 is provided with an insertion part 131 that can be inserted into the annular groove 122 and an abutment wall 132 that abuts against the end of the groove wall of the annular groove 122. The insertion part 131 and the annular groove 122 can be welded together by friction welding. Compared with welding using sealing rings and screws, this not only reduces the number of parts but also reduces the outer diameter of the lower housing 13. Compared with laser welding, friction welding does not require the lower housing 13 to be transparent and does not produce spatter. Compared with ultrasonic welding, friction welding does not require high-frequency vibration and is less destructive to the product.

[0057] In this embodiment, the electrical control cavity 03 is provided with an electrical control chamber 04 and a receiving chamber 05 that are interconnected and arranged along the first direction. The receiving chamber 05 is radially surrounding the outer periphery of the rotor cavity 02. The first electrical component 70 extends at least partially into the receiving chamber 05, making full use of the idle space outside the rotor cavity 02 to accommodate the first electrical component. In practical applications, the first electrical component 70 generally has a large physical size and a large amount of heat generation. The fact that the first electrical component 70 extends at least partially into the receiving chamber 05 can significantly reduce the axial height of the electrical control component in the electrical control chamber 04, so that the electrical control chamber 04 can have a smaller axial size. This results in a smaller space occupied by the electric water pump along the first direction, which is beneficial for the miniaturization design of the electric water pump. Since the stator of the brushless motor in the prior art is arranged around the rotor cavity and fixed to the housing, the arrangement of the receiving chamber 05 does not require modification of the housing structure, resulting in minimal modification and low modification cost. Furthermore, since the housing 05 radially surrounds the outer periphery of the rotor cavity 02, the heat generated by the first electrical component 70 during operation can be transferred to the rotor cavity 02 and carried away by the coolant flowing inside the rotor cavity 02. This allows the heat from the first electrical component 70, which generates a large amount of heat, to be quickly dissipated, thereby improving the heat dissipation efficiency of the electronic control components.

[0058] In this embodiment, the first electrical component 70 is fixed to the side of the control board 60 facing the rotor cavity 02. Compared with the solution where the first electrical component 70 penetrates through the control board 60, the first electrical component 70 extends into the receiving chamber 05 in a larger portion, which is more conducive to reducing the axial dimension of the control chamber 04.

[0059] In this embodiment, the electronic control assembly is further provided with at least two second electrical components 73 fixed to the side of the electronic control board 60 away from the rotor cavity 02. The height of the second electrical component 73 along the first direction is less than the height of the first electrical component 70 along the first direction. With this arrangement, electrical components can be fixed to both sides of the electronic control board 60. Compared with the solution of fixing electrical components to only one side of the electronic control board 60, it is more conducive to reducing the area of ​​the electronic control board 60, thereby reducing the space of the electronic control cavity 03 in the radial direction, and further facilitating the miniaturization design of the electric water pump.

[0060] In this embodiment, the number of first electrical components 70 is at least two, and at least one is a capacitor 71 and at least one is an inductor 72. The electronic control assembly is also provided with limiting components 80 that are equal in number and correspond one-to-one with the number of capacitors 71. The limiting components 80 are fixed to the side of the electronic control board 60 near the first heat-conducting wall 16 and are radially limited and matched with the corresponding capacitors 71. This can reduce the vibration of the capacitors 71, thereby avoiding damage to the capacitors 71 by vibration, improving the service life of the capacitors 71, and ensuring the stable operation of the electronic control assembly.

[0061] In this embodiment, the control board 60 is attached to the first heat-conducting wall 16, so that the heat of the control board 60 can be quickly transferred to the first heat-conducting wall 16. The heat of the control board 60 mainly comes from the first electrical component 70 and the second electrical component 73. That is, the heat of the first electrical component 70 and the second electrical component 73 can be indirectly transferred to the first heat-conducting wall 16 through the control board 60. The projections of the second electrical component 73 and the first heat-conducting wall 16 on the projection plane perpendicular to the first direction overlap at least partially, which is more conducive to the rapid transfer of the heat of the second electrical component 73 to the first heat-conducting wall 16. There is coolant flowing in the rotor cavity 02 of the electric water pump. The heat transferred to the first heat-conducting wall 16 is quickly carried away by the flowing coolant, thereby improving the heat dissipation efficiency of the control components, ensuring the stable operation of the control components, and reducing the heat dissipation cost.

[0062] In this embodiment, a first thermally conductive layer 91 is provided between the first electrical component 70 and the second thermally conductive wall 17, which facilitates the rapid transfer of heat from the first electrical component 70 to the second thermally conductive wall 17, thereby improving the heat exchange efficiency of the first electrical component 70. In practical applications, the first thermally conductive layer 91 is often formed by thermally conductive adhesive, so the first thermally conductive layer 91 can also reduce the vibration of the first electrical component 70 and prevent the first electrical component 70 from being damaged by impact.

[0063] In this embodiment, a second thermally conductive layer 92 is sandwiched between the electronic control board 60 and the first thermally conductive wall 16, which facilitates the rapid transfer of heat from the electronic control board 60 to the first thermally conductive wall 16, thereby improving the heat exchange efficiency of the electronic control component. In practical applications, the second thermally conductive layer 92 is often formed by thermally conductive adhesive, so the second thermally conductive layer 92 can also reduce the vibration of the electronic control board 60 and ensure the stable operation of the electronic control component.

[0064] In this embodiment, the pump shaft 20 is provided with a water passage 21 along its extension direction. The high-pressure zone is connected to the low-pressure zone through the rotor cavity 02 and the water passage 21, which can establish an internal circulation cooling channel inside the electric water pump. Water flows from the high-pressure zone to the low-pressure zone through the internal circulation cooling channel to form an internal circulation cooling water flow, which is beneficial for the heat dissipation of the stator 50 and the electronic control board 60. Although the internal circulation cooling water flow may reduce the operating efficiency of the electric water pump, effective heat dissipation can improve the service life of the electric water pump. A water passage gap is formed between the third heat-conducting wall 14 and the rotor 40. The internal circulation cooling water flows through the water passage gap, making it easier to carry away the heat generated by the stator 50 during the operation of the electric water pump.

[0065] In this embodiment, the stator 50 is also provided with a connection terminal 51 extending into the receiving chamber 05, and the electronic control board 60 is provided with a connection hole corresponding to the connection terminal 51; the middle housing 12 is also provided with a positioning post 15 extending out of the receiving chamber 05 corresponding to the receiving chamber 05, and the electronic control board 60 is provided with a positioning hole adapted to the positioning post 15, which is conducive to the rapid installation of the electronic control components.

[0066] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this utility model, but does not constitute a limitation on the scope of protection of this utility model. Modifications, equivalent substitutions, or other improvements to the embodiments of this utility model or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this utility model or the foregoing embodiments, should all be included within the scope of protection of this utility model.

Claims

1. An electric water pump, characterized in that, include The housing (10) has a rotor cavity (02) extending along a first direction and an electrical control cavity (03) adjacent to and watertight from the rotor cavity (02). The electrical control cavity (03) has an electrical control chamber (04) and a receiving chamber (05) that are connected to each other and arranged along the first direction. The electrical control chamber (04) is located at one end of the rotor cavity (02) along the first direction, and the receiving chamber (05) is radially surrounding the outer periphery of the rotor cavity (02). An electrical control assembly is placed inside an electrical control cavity (03) and has an electrical control board (60) and at least one first electrical component (70) fixedly connected to the electrical control board (60). The electrical control board (60) is located inside the electrical control chamber (04), and the first electrical component (70) extends at least partially into the receiving chamber (05).

2. The electric water pump as described in claim 1, characterized in that, The first electrical component (70) is fixed to the side of the control board (60) facing the rotor cavity (02).

3. An electric water pump as described in claim 2, characterized in that, The electronic control assembly is further provided with at least two second electrical components (73) fixed to the side of the electronic control board (60) away from the rotor cavity (02), and the height of each second electrical component (73) along the first direction is less than the height of the first electrical component (70) along the first direction.

4. An electric water pump as described in claim 2, characterized in that, The number of the first electrical components (70) is at least two, and at least one is a capacitor (71) and at least one is an inductor (72). The electronic control assembly is also provided with limiting members (80) that are equal in number and correspond one-to-one with the number of capacitors (71). The limiting members (80) are fixed to the side of the electronic control board (60) near the first heat-conducting wall (16) and are radially limited and matched with the corresponding capacitors (71).

5. An electric water pump as described in claim 3, characterized in that, The cavity wall between the rotor cavity (02) and the electrical control chamber (04) is provided with a first heat-conducting wall (16) perpendicular to the first direction, and the projections of the second electrical component (73) and the first heat-conducting wall (16) on the projection plane perpendicular to the first direction at least partially overlap; the electrical control board (60) is attached to the first heat-conducting wall (16).

6. An electric water pump as described in claim 5, characterized in that, A second heat-conducting layer (92) is also sandwiched between the electronic control board (60) and the first heat-conducting wall (16).

7. An electric water pump as described in claim 1, characterized in that, The cavity wall between the rotor cavity (02) and the receiving chamber (05) is provided with a second heat-conducting wall (17), and a first heat-conducting layer (91) is provided between the first electrical component (70) and the second heat-conducting wall (17).

8. An electric water pump as described in any one of claims 1-7, characterized in that, The housing (10) includes an upper housing (11), a middle housing (12) and a lower housing (13). The upper housing (11) is watertightly connected to the middle housing (12), and the lower housing (13) is fixedly connected to the middle housing (12). The rotor cavity (02) is formed in the middle housing (12), and the middle housing (12) and the lower housing (13) enclose an electrical control cavity (03).

9. An electric water pump as described in claim 8, characterized in that, It also includes a pump shaft (20), a rotating assembly, and a stator (50); the upper housing (11) is provided with an impeller cavity (01), an inlet, and an outlet; the rotor cavity (02) is connected to the impeller cavity (01) along a first direction; the electrical control chamber (04) is located away from the impeller cavity (01) along the first direction; The pump shaft (20) extends along a first direction and its two ends are located in the impeller cavity (01) and the rotor cavity (02) respectively. The pump shaft (20) is provided with a water passage (21) along its extension direction. The rotating assembly includes a rotor (40) and an impeller (30). The rotor (40) is located in the rotor cavity (02) and is rotatably connected to the pump shaft (20). The impeller (30) is located in the impeller cavity (01) and is fixedly connected to the rotor (40). A high-pressure zone is formed between the impeller (30) and the cavity wall of the impeller cavity (01). The high-pressure zone is connected to a low-pressure zone near the inlet through the rotor cavity (02) and the water passage (21). A third heat-conducting wall (14) is formed on the side cavity wall of the rotor cavity (02). A water passage gap is formed between the third heat-conducting wall (14) and the rotor (40). The water passage gap is used to connect the high-pressure zone and the water passage (21). The stator (50) is fixedly connected to the housing (10) and surrounds the rotor cavity (02); The electronic control board (60) is electrically connected to the stator (50) to control the stator (50).

10. An electric water pump as described in claim 9, characterized in that, The stator (50) is also provided with a connection terminal (51) extending into the receiving chamber (05), and the electronic control board (60) is provided with a connection hole (61) corresponding to the connection terminal (51); the middle housing (12) is also provided with a positioning post (15) extending out of the receiving chamber (05) corresponding to the receiving chamber (05), and the electronic control board (60) is provided with a positioning hole (62) adapted to the positioning post (15).

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