Electronic water pump, electronic water pump assembly and thermal management system

Abstract

The electronic water pump comprises an isolation sleeve, a stator winding, a rotor and a metal shielding layer, the isolation sleeve is provided with a rotor cavity and a stator cavity which are separated from each other, and the stator cavity surrounds the rotor cavity; the stator winding and the rotor are arranged in the stator cavity; the metal shielding layer is located in the isolation sleeve and is attached to the inner wall of the stator cavity; the cavity inner wall comprises an outer side wall which surrounds the stator winding in the circumferential direction, and the metal shielding layer at least partially covers the outer side wall. According to the utility model, the metal shielding layer is located in the isolation sleeve and is attached to the inner wall of the stator cavity, which means that the arrangement of the metal shielding layer does not need to consider the shape of the stator winding, the structural strength of the metal shielding layer does not need to be highly required, and the attached arrangement does not affect the metal shielding layer even if the metal shielding layer runs and vibrates for a long time; and the metal shielding layer is not easy to damage. And the metal shielding layer at least partially covers the outer side wall, so that the electromagnetic compatibility of the equipment can be ensured to a great extent.

Description

Technical Field

[0001] The utility model relates to the technical field of water pumps, in particular to an electronic water pump, an electronic water pump component and a thermal management system. Background Art

[0002] An electronic water pump typically consists of a stator, rotor, fan blades, and a housing. During operation, the stator and rotor generate electromagnetic radiation, potentially interfering with surrounding electronic equipment or circuits, affecting their proper operation. To reduce electromagnetic interference from the motor, a thin foil is placed around the motor housing. This shielding acts as a barrier, confining the electromagnetic radiation generated within the motor to a specific range and preventing it from interfering with surrounding electronics or circuits.

[0003] However, the shielding cover structure is relatively thin, which is not only inconvenient to install, but the foil is also prone to breakage and deformation during the transportation and operation of the equipment, making it unable to play an effective shielding role. Utility Model Content

[0004] The purpose of the utility model is to provide an electronic water pump, an electronic water pump assembly and a thermal management system to solve the problem of inconvenience in installation and transportation of the existing shielding cover.

[0005] In order to achieve one of the above purposes, the utility model provides an electronic water pump, comprising:

[0006] An isolation sleeve, wherein the isolation sleeve has a rotor cavity and a stator cavity separated from each other, and the stator cavity is arranged to surround the rotor cavity;

[0007] a stator winding, disposed in the stator cavity;

[0008] a rotor disposed in the rotor cavity;

[0009] a metal shielding layer, the metal shielding layer being located within the isolation sleeve and being arranged in contact with the inner wall of the stator cavity;

[0010] The cavity inner wall includes an outer wall, the outer wall surrounds the stator winding in a circumferential direction, and the metal shielding layer at least partially covers the outer wall.

[0011] As a further improvement of an embodiment of the present invention, along the direction of the rotation axis of the rotor, the metal shielding layer completely surrounds the stator winding.

[0012] As a further improvement of an embodiment of the present invention, the metal shielding layer is a metal ring embedded in the outer side wall, and the shape of the metal ring matches the shape of the outer side wall.

[0013] As a further improvement of an embodiment of the present invention, the metal shielding layer is a metal coating coated on the inner wall of the cavity.

[0014] As a further improvement of an embodiment of the present invention, the cavity inner wall further includes an inner wall and a connecting wall connecting the outer wall and the inner wall, and the outer wall is provided with a boss for abutting against the limiting portion of the stator winding.

[0015] As a further improvement of an embodiment of the present invention, at least a portion of the outer side wall is recessed in a direction away from the rotor to form a avoidance groove for accommodating a portion of the stator winding.

[0016] As a further improvement of an embodiment of the present invention, the inner side wall is provided with a guide rib extending along the motor axis direction, and the width of the guide rib gradually increases in the direction approaching the connecting wall.

[0017] As a further improvement of an embodiment of the present invention, the electronic water pump further includes a metal end cover that closes the opening of the stator cavity.

[0018] In order to achieve one of the above objectives, one embodiment of the present invention provides an electronic water pump assembly, including the electronic water pump as described above, wherein the electronic water pump assembly further includes an annular heating assembly coaxially arranged with the isolation sleeve of the electronic water pump.

[0019] In order to achieve one of the above objectives, an embodiment of the present invention provides a thermal management system, including the aforementioned electronic water pump, or including the aforementioned electronic water pump assembly.

[0020] Compared to existing technologies, the metal shielding layer of the present invention is located within the isolation sleeve and conforms to the inner wall of the stator cavity. This means that the metal shielding layer's placement does not require consideration of the shape of the stator windings. Furthermore, the conforming stator cavity wall eliminates the need for high structural strength requirements for the metal shielding layer itself. This conforming arrangement also protects the metal shielding layer from vibrations during long-term operation, making it less susceptible to damage. The metal shielding layer at least partially covers the outer wall, significantly ensuring the device's electromagnetic compatibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the explosion structure of an electronic water pump according to this embodiment;

[0022] Figure 2 This is a cross-sectional view with the axis of the electronic water pump as the section line;

[0023] Figure 3 It is an axonometric drawing of the isolation sleeve;

[0024] Figure 4 yes Figure 3 A schematic diagram of the structure of part A;

[0025] Figure 5 is a top view of the isolation sleeve;

[0026] Figure 6 yes Figure 5 Schematic diagram of the enlarged structure of part B.

[0027] Reference numerals:

[0028] 10. Isolation sleeve; 11. Rotor cavity; 12. Stator cavity; 121. Outer wall; 122. Avoidance groove; 123. Inner wall; 124. Connecting wall; 125. Boss; 126. Guide rib; 20. Stator winding; 30. Rotor; 40. Metal shielding layer; 50. Metal end cover. DETAILED DESCRIPTION

[0029] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0030] Terms indicating spatial relative positions, such as "upper," "above," "lower," and "below," are used in this embodiment for ease of explanation to describe the relationship of one element or feature relative to another element or feature as shown in the accompanying drawings. Spatially relative terms may be intended to encompass different orientations of the device during use or operation other than the orientation shown in the drawings.

[0031] It should be noted that, unless otherwise expressly specified or limited, the term "connection" should be understood in a broad sense. For example, connection can be direct or indirect through an intermediate medium, and can be fixed, movable, detachable, or integral. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0032] In the prior art, flexible foils of metal foil or metallized plastic film are radially placed around the stator windings within the motor housing to improve the motor's electromagnetic compatibility (EMC) performance. Suitable foils include copper foil or flexible foils with a thickness of approximately 0.1 mm or less, and can also include meshes made of a mixture of plastic and metal fibers. The foil is partially placed between the stator windings and the motor housing, without any support.

[0033] Research has revealed the following: 1. Metal foil or flexible foil is designed to be relatively thin and lacks toughness, making it susceptible to deformation during installation, which can compromise shielding effectiveness. 2. Maintaining the metal foil or flexible foil against deformation requires strict storage, transportation, and packaging, resulting in high costs. 3. Long-term vibration from motor operation can cause the metal foil to crack and damage, compromising shielding effectiveness. 4. The stator winding and motor housing must be a standard circular shape, and the motor housing must be free of ribs or pillars, otherwise installation will be difficult.

[0034] In order to make those skilled in the art better understand the technical solution of the present invention, the following will be combined with the appended drawings in the embodiment of the present invention. Figure 1 -6. Provide a clear and complete description of the technical solutions in the embodiments of the present invention.

[0035] An embodiment of the present invention provides an electronic water pump, referring to Figure 1 and Figure 2 , including an isolation sleeve 10, a stator winding 20, a rotor 30, and a metal end cover 50 connected to the isolation sleeve 10. The isolation sleeve 10 has a rotor cavity 11 and a stator cavity 12 separated from each other. The stator winding 20 is arranged in the stator cavity 12, and the rotor 30 is arranged in the rotor cavity 11. The stator cavity 12 is arranged around the rotor cavity 11, that is, the rotor 30 is located on the circumferential inner side of the stator winding 20.

[0036] In this embodiment, the isolation sleeve 10 is an integrally formed structure. The outer peripheral wall of the isolation sleeve 10 serves as the housing of the electronic water pump. The metal end cap 50 is connected to one end of the stator cavity 12 of the isolation sleeve 10 and closes the opening of the stator cavity 12. The other axial end of the isolation sleeve 10 is connected to a pump cover, with the rotor 30 facing the pump cover. The pump cover is provided with a liquid inlet and a liquid outlet. In other embodiments, the electronic water pump may also be provided with a separate housing, which is provided on the outer peripheral side of the isolation sleeve 10 and accommodates the isolation sleeve 10. For example, the housing and isolation sleeve 10 are provided coaxially. In this case, the metal end cap 50 and the cover plate can be mounted on the housing.

[0037] In this embodiment, the stator cavity 12 in the above-mentioned electronic water pump is a dry cavity, and the rotor cavity 11 is a wet cavity, that is, the isolation sleeve 10 clearly separates the electrical structure and the water structure in the water pump to prevent liquid from entering the electrical structure. The metal end cover 50 closes the opening of the stator cavity 12 and is fixedly connected to the isolation sleeve 10. Specifically, the isolation sleeve 10 is provided with a plurality of mounting protrusions along its circumference at one end facing the metal end cover 50. The metal end cover 50 is fixed to the isolation sleeve 10 by screws corresponding to each mounting protrusion passing through the metal end cover 50 and connected to the mounting protrusion. Furthermore, at the junction of the isolation sleeve 10 and the metal end cover 50, at least one of the two is provided with a groove for placing a sealing ring to ensure the seal between the two. Liquids such as water are isolated from the stator cavity 12 by the isolation sleeve 10 and the metal end cover 50. A circuit board structure is disposed between the metal end cap 50 and the stator winding 20. The stator winding 20's terminals are connected to the circuit board structure, which connects the stator winding 20 to an external circuit or power source. The rotor 30 within the rotor cavity 11 is connected to an impeller at the end facing away from the metal end cap 50 for pumping fluid.

[0038] During the operation of the electronic water pump, after the stator winding 20 is energized, when the alternating frequency and waveform of the current wave input to the stator winding 20 change, a magnetic field rotating around the axis of the water pump will be formed around the coil of the stator winding 20. This magnetic field drives the rotor 30 to rotate, and the rotation of the rotor 30 drives the impeller to rotate to achieve the transmission of liquids such as water.

[0039] Reference Figure 3 The inner wall of the stator cavity 12 includes an inner wall 123 proximal to the rotor cavity 11, an outer wall 121 distal to the rotor cavity 11, and a connecting wall 124 connecting the inner wall 123 and the outer wall 121. Thus, with the axial direction of the electronic water pump as a cross-section, the stator cavity 12 forms a U-shaped mounting chamber. The stator winding 20 is connected to the mounting chamber, i.e., the outer wall 121 of the inner wall circumferentially surrounds the stator winding 20.

[0040] Reference Figure 1 A metal shielding layer 40 is disposed within the isolation sleeve 10. The metal shielding layer 40 is annularly attached to the inner wall of the stator cavity 12 and completely surrounds the stator winding 20 in the direction of the rotation axis of the rotor 30. In other words, the metal shielding layer 40 forms a shielding cover in the circumferential direction. The shielding cover can isolate the stator and rotor inside the electronic water pump from the outside. This not only isolates the electromagnetic waves inside the electronic water pump and prevents them from spreading to the external environment, but also isolates the electromagnetic waves outside the electronic water pump and prevents other electromagnetic radiation from interfering with the operation of the stator and rotor, thereby improving the electromagnetic compatibility of the electronic water pump and making the operation of the electronic water pump more stable and reliable.

[0041] Of course, in an optional embodiment, the metal shielding layer 40 may only partially surround the stator winding 20, that is, the projection of the metal shielding layer 40 along the axis of the electronic water pump does not completely cover the projection of the stator winding 20 along the axis of the electronic water pump. It can be understood that the electromagnetic shielding effect of the incompletely covered metal shielding layer 40 is not as significant as the electromagnetic shielding effect of the completely covered metal shielding layer 40.

[0042] In this embodiment, the metal shielding layer 40 can be made of ferromagnetic material or conductive material. As an example, one of copper, iron, and aluminum or an alloy material containing any of them can be selected. As long as it can play the role of shielding electromagnetic radiation, this embodiment does not make any specific limitations.

[0043] In one embodiment, the metal shielding layer 40 is configured as a metal ring that engages with the outer wall 121 of the stator cavity 12, and the shape of the metal ring matches the shape of the outer wall 121. For example, the isolation sleeve 10 is an integral structure that is injection-molded. The metal ring is placed in the injection mold cavity before or during the injection molding process. After the isolation sleeve 10 is formed, the metal ring is embedded in the isolation sleeve 10. The metal ring is relatively easy to install, and the connection between the metal ring and the isolation sleeve 10 is more stable. During transportation or operation of the electronic water pump, even if it is bumped or collided, the metal ring structure is relatively stable, and can provide effective shielding during the operation of the electronic water pump.

[0044] In an optional embodiment, the metal shielding layer 40 is a metal coating applied to the inner wall of the cavity. The metal coating covers at least the outer wall 121. In order to achieve a better shielding effect, the metal coating can also be applied to the connecting wall 124. It should be noted that it is not recommended to apply a metal coating to the inner wall 123 of the stator cavity 12. If the inner wall 123 is coated with a metal coating, it will interfere with the electromagnetic signal between the stator winding 20 and the rotor 30. As an example, the metal coating can be formed on the outer wall 121 and the connecting wall 124 by spraying or electroplating. The provision of the metal coating is relatively convenient, and the cost of producing the metal shielding layer 40 is low, which not only facilitates production but also provides a more stable shielding effect.

[0045] Reference Figure 5 and Figure 6In this embodiment, at least part of the structure in the outer wall 121 is recessed in a direction away from the rotor 30 to form a stator groove 122 for accommodating a portion of the stator winding 20. The stator groove 122 is provided to facilitate the accommodation of the terminal on the stator winding 20. Specifically, the stator winding 20 needs to be wound with coils during the manufacturing process, and the wire ends will be connected to the terminal positions. When a complex situation occurs, such as a single terminal being wound with multiple turns of winding, the size of the coil of the stator winding 20 at the terminal position will exceed the size of its own cylindrical body along the circumference of the stator winding 20. Therefore, the stator cavity 12 needs to have enough space to accommodate the above-mentioned excess part. The stator groove 122 cooperates with the coil at the terminal position in the stator winding 20 to facilitate the assembly of the stator winding 20.

[0046] A boss 125 is protruding from one end of the outer wall 121 toward the connecting wall 124 and is used to abut against the limiting portion of the stator winding 20. Several bosses 125 are arranged along the circumference of the outer wall 121. The several bosses 125 can provide support for the stator winding 20 in the circumferential direction, so that the stator winding 20 can be more firmly installed in the stator cavity 12, avoiding the stator winding 20 from being bumped during transportation or operation, and making the operation of the electronic water pump more reliable.

[0047] Because the outer wall 121 is provided with a relief groove 122 and a boss 125 structure that matches the shape of the stator winding 20, the metal ring must be configured to match the shape of the outer wall 121. The metal ring is provided with a protrusion structure with the same shape as the relief groove 122. During the production of the isolation sleeve 10, the metal ring is placed in the injection mold cavity, and the relief groove 122 structure is formed when the isolation sleeve 10 is molded. The metal ring structure is located on the side of the boss 125 away from the connecting wall 124. During the injection molding of the isolation sleeve 10, the metal ring structure does not interfere with the formation of the boss 125.

[0048] The inner wall 123 of the cavity inner wall is provided with a guide rib 126 extending along the axis of the motor. Several guide ribs 126 are provided along the circumference of the inner wall 123. The specific number of guide ribs 126 matches the number of guide slots in the stator winding 20. The guide slots can be defined by the gaps between the coils in the stator winding 20, for example, by the spacing between the winding brackets. The guide ribs 126 engage in the slots between adjacent winding brackets. The width of the guide rib 126 gradually increases in the direction approaching the connecting wall 124, that is, along the installation direction of the stator winding 20, the width of the guide rib 126 increases from small to large. The end of the guide rib 126 with a smaller width can be quickly and conveniently assembled with the stator winding 20, and the end of the guide rib 126 with a larger width can engage with the winding brackets and coils on both sides. Therefore, the guide rib 126 can play a role in fixing and limiting the stator winding 20, making the installation of the stator winding 20 more stable.

[0049] In this embodiment, the metal shielding layer 40 is arranged to fit the outer wall 121 of the inner wall of the cavity. Regardless of whether the metal shielding layer 40 is arranged as a metal ring or a metal coating, the metal shielding layer 40 will not be squeezed and deformed by external forces during the production process, and has a stable shielding effect; and the shape of the metal shielding layer 40 does not require other components in the electronic water pump to be arranged into a special shape, which facilitates the arrangement of the metal shielding layer 40; since the metal shielding layer 40 fits the outer wall 121, the isolation sleeve 10 has a supporting force on the metal shielding layer 40. During the transportation and operation of the electronic water pump, even if bumps and vibrations occur, the metal shielding layer 40 is not easily deformed or damaged, so it has a relatively stable shielding effect to ensure the good operation of the electronic water pump.

[0050] The above embodiment serves only as an example of the present invention. In other alternative embodiments, the metal shielding layer 40 may be connected to the isolation sleeve 10 or the housing of the electronic water pump using other shapes. Of course, to accommodate the product requirements of different electronic water pump models, the inner wall of the isolation sleeve 10 may also be adjusted according to the specific shapes of the stator winding 20 and rotor 30 to meet product design requirements, and this is not specifically limited in this embodiment.

[0051] One embodiment of the present invention provides an electronic water pump assembly, comprising the aforementioned electronic water pump and an annular heating assembly, the annular heating assembly being coaxially disposed with an isolation sleeve 10 within the electronic water pump. Specifically, the annular heating assembly is disposed outside the isolation sleeve 10 and communicates with the water path structure of the electronic water pump. Fluid can flow through the annular heating assembly, be heated, and then be discharged, thereby realizing the function of a heat pump.

[0052] One embodiment of the present invention provides a thermal management system, which includes the aforementioned electronic water pump, or the thermal management system includes the aforementioned electronic water pump component, that is, the thermal management system includes the electronic water pump and a heating component.

[0053] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the scope of implementation of the present invention is not limited to what is shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which do not exceed the spirit covered by the description and drawings, should be within the scope of protection of the present invention.

Claims

1. An electronic water pump, characterized in that: include: An isolation sleeve (10), the isolation sleeve (10) having a rotor cavity (11) and a stator cavity (12) separated from each other, the stator cavity (12) being arranged to surround the rotor cavity (11); A stator winding (20) is disposed in the stator cavity (12); A rotor (30) is disposed in the rotor cavity (11); a metal shielding layer (40), the metal shielding layer (40) being located in the isolation sleeve (10) and being arranged in contact with the inner wall of the stator cavity (12); The cavity inner wall comprises an outer wall (121), the outer wall (121) surrounds the stator winding (20) in the circumferential direction, and the metal shielding layer (40) at least partially covers the outer wall (121).

2. The electronic water pump according to claim 1, characterized in that: Along the direction of the rotation axis of the rotor (30), the metal shielding layer (40) completely surrounds the stator winding (20).

3. The electronic water pump according to claim 1, characterized in that: The metal shielding layer (40) is a metal ring embedded in the outer side wall (121), and the shape of the metal ring matches the shape of the outer side wall (121).

4. The electronic water pump according to claim 1, characterized in that: The metal shielding layer (40) is a metal coating coated on the inner wall of the cavity.

5. The electronic water pump according to any one of claims 1 to 4, characterized in that: The inner wall of the cavity further comprises an inner wall (123) and a connecting wall (124) connecting the outer wall (121) and the inner wall (123); the outer wall (121) is provided with a boss (125) for abutting against a limiting portion of the stator winding (20).

6. The electronic water pump according to claim 3, characterized in that: At least a portion of the outer side wall (121) is recessed in a direction away from the rotor (30) to form a relief groove (122) for accommodating a portion of the stator winding (20); At least a portion of the metal ring matches the shape of the avoidance groove (122), and the metal ring can be embedded in the avoidance groove (122).

7. The electronic water pump according to claim 5, characterized in that: The inner side wall (123) is provided with a guide rib (126) extending along the motor axis direction, and the width of the guide rib (126) gradually increases in a direction approaching the connecting wall (124).

8. The electronic water pump according to claim 1, characterized in that: The electronic water pump further comprises a metal end cover (50) for closing the opening of the stator cavity (12).

9. An electronic water pump assembly, characterized in that: The electronic water pump comprises the electronic water pump according to any one of claims 1 to 8, wherein the electronic water pump assembly further comprises an annular heating assembly coaxially arranged with the isolation sleeve (10) of the electronic water pump.

10. A thermal management system, characterized in that: The electronic water pump comprises the electronic water pump according to any one of claims 1 to 8, or the electronic water pump assembly according to claim 9.

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