A pump and a dishwasher having the same

Abstract

The application discloses a pump and a dishwasher with the pump, which comprise a motor assembly, a pump shell, an impeller and a water distribution tray. The motor assembly comprises a stator assembly and a rotor assembly. The pump has a pump cavity. The first opening end of the pump shell is fixedly connected with the water distribution tray. The motor assembly further comprises a coil. The stator assembly comprises a stator tooth portion. The coil corresponds to the stator tooth portion. The coil is wound around the stator tooth portion to form a coil winding assembly. The adjacent coil winding assemblies have accommodating cavities. The water distribution tray comprises a barrel portion and a protruding portion. The water distribution tray is made of a heat-conducting material. The barrel portion has a rotor cavity. At least a part of the rotor assembly is accommodated in the rotor cavity. The stator assembly is sleeved with the outer circumferential portion of the barrel portion. A part of the protruding portion is accommodated in the accommodating cavities. A part of the protruding portion is located between the adjacent coil winding assemblies. The pump can improve the heat dissipation capacity of the motor.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, and more specifically, to a pump and a dishwasher having the pump. Background Technology

[0002] Dishwashers and other home appliances use high-temperature, high-pressure water jets to wash the surfaces of dishes during operation, requiring a power system. A pump meets the power demands of the dishwasher. One type of such pump includes a motor assembly, a pump housing, and an impeller. The motor generates a significant amount of heat during operation, necessitating cooling. In this type of pump, air cooling is used for motor dissipation, which is inefficient. Prolonged continuous use can cause the motor temperature to become excessively high, thus affecting its performance. Summary of the Invention

[0003] One objective of this application is to provide a pump that can improve the heat dissipation capacity of an electric motor.

[0004] To achieve the above objectives, the pump of this application includes a motor assembly, a pump casing, an impeller, and a water distribution plate. The motor assembly includes a stator assembly and a rotor assembly. The pump has a pump chamber, and the impeller is housed within the pump chamber. A first open end of the pump casing is fixedly connected to the water distribution plate. A portion of the water distribution plate facing the pump chamber is a corresponding portion of the pump chamber wall. The pump has an inlet channel and an outlet channel, with the inlet channel communicating with the pump chamber and the outlet channel communicating with the pump chamber. The motor assembly also includes multiple coils, and the stator assembly includes multiple stator teeth. The coil is arranged circumferentially, corresponding to the stator teeth. The coil is wound around the stator teeth to form a coil winding assembly, and there is a receiving cavity between adjacent coil winding assemblies. The water distribution plate includes a cylindrical part and at least one protrusion. The water distribution plate is made of a heat-conducting material. The cylindrical part has a rotor cavity, and at least a portion of the rotor assembly is housed in the rotor cavity. The stator assembly is sleeved on the outer periphery of the cylindrical part. The protrusion protrudes from the outer periphery, and a portion of the protrusion is housed in the receiving cavity. A portion of the protrusion is located between adjacent coil winding assemblies.

[0005] As can be seen from the above technical solution, the coils of the pump stator assembly are arranged circumferentially, the water distribution plate is made of heat-conducting material, the part of the water distribution plate facing the pump cavity is the wall corresponding to the pump cavity, and the protruding part of the water distribution plate is located between adjacent coil assemblies. When the pump is working, the water distribution plate can transfer the heat generated by the coil to the liquid in the pump cavity for heat dissipation, thereby improving the heat dissipation capacity of the motor.

[0006] The pump also includes a heating device, the second open end of the pump casing is fixedly connected to the heating device, the water inlet channel is located in the heating device, and the rotor cavity is connected to the pump cavity.

[0007] The protrusion includes a root and an end, the root being connected to the outer peripheral portion, and the end being accommodated in the receiving cavity. In the circumferential direction of the cylindrical portion, the length of the root is greater than the length of the end.

[0008] The protrusion includes a main body located between the root and the end. The main body includes a first extension and a second extension. The first extension is located between the root and the second extension, and the second extension is located between the end and the first extension. In the circumferential direction of the cylindrical portion, the length at the connection between the first extension and the second extension is greater than the length of the root, such that the wall of the first extension approaches the stator tooth portion; the length at the connection between the first extension and the second extension is less than the length of the end, such that the wall of the second extension approaches the coil.

[0009] The first extension has a trapezoidal channel, and the second extension has a trapezoidal groove. One end of the trapezoidal channel is connected to the trapezoidal groove, and the other end of the trapezoidal channel is connected to the rotor cavity. The trapezoidal channel connects the rotor cavity and the trapezoidal groove.

[0010] The stator tooth portion includes a foot portion that abuts against the outer peripheral portion. The foot portion is located between adjacent protrusions. In the circumferential direction of the cylindrical portion, the distance between adjacent feet is greater than the length of the root portion, and the distance between adjacent coils is greater than the length of the end portion. In the axial direction of the cylindrical portion, the stator assembly is engaged and fixed to the body portion.

[0011] The cylindrical body includes a bottom and an open end. In the axial direction of the cylindrical body, the bottom is fixedly connected to one end of the outer periphery, and the open end is fixedly connected to the other end of the outer periphery. In a direction perpendicular to the axial direction of the cylindrical body, the protrusion is accommodated between the plane where the bottom of the cylindrical body is located and the plane where the open end is located.

[0012] The water distribution plate includes a main body, which is connected to the opening end. The main body extends radially outward along the opening end. The main body, the cylindrical part, and the protrusion are integrally injection molded.

[0013] The pump also includes a shaft support, the rotor assembly includes a rotating shaft, the shaft support is fixedly connected to the open end, the shaft support has a first through hole and a second through hole, the rotating shaft is partially accommodated in the first through hole, and the second through hole connects the rotor cavity and the pump cavity.

[0014] Another objective of this application is to provide a dishwasher with a long service life.

[0015] The dishwasher includes a body, a circulation system, and the aforementioned pump. The body includes an inner tub and a water cup. The circulation system connects the inner tub and the water cup, and the pump provides power to the circulation system.

[0016] The portion of the water distribution plate facing the pump chamber is the wall corresponding to the pump chamber. The protruding part of the water distribution plate is located between adjacent coil assemblies. When the pump is working, the water distribution plate can transfer the heat generated by the coil to the liquid in the pump chamber for heat dissipation, which improves the heat dissipation capacity of the motor and extends the service life of the dishwasher. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the assembly structure of the pump according to an embodiment of this application;

[0018] Figure 2 This is an exploded structural diagram of a pump according to an embodiment of this application;

[0019] Figure 3 This is a schematic diagram of the assembly structure of the water distribution plate and motor assembly according to an embodiment of this application;

[0020] Figure 4 yes Figure 1 A schematic diagram of a cross-section cut along line AA in the middle;

[0021] Figure 5 yes Figure 3 A schematic diagram of a cross-section taken along the middle BB line;

[0022] Figure 6 yes Figure 5 Enlarged diagram of the C-ring;

[0023] Figure 7 This is an enlarged schematic diagram according to another embodiment of this application;

[0024] Figure 8 According to another embodiment of this application Figure 5 Enlarged diagram of the C-ring;

[0025] Figure 9 This is a schematic diagram of the motor assembly structure according to an embodiment of this application;

[0026] Figure 10 This is a schematic diagram of the water distribution plate structure according to an embodiment of this application;

[0027] Figure 11 This is a schematic diagram of the assembly structure of the water distribution plate and rotor assembly according to an embodiment of this application;

[0028] Figure 12 This is a schematic diagram of the assembly structure of the water distribution plate, rotor assembly and shaft support according to an embodiment of this application.

[0029] Figure label:

[0030] 1-Motor assembly; 11-Stator assembly; 111-Coil; 1111-Coil winding assembly; 112-Stator teeth; 1121-Foot; 113-Stator yoke; 114-Fixing hole; 12-Rotor assembly; 121-Shaft; 122-Shaft support; 1221-First through hole; 1222-Second through hole; 13-Receiving cavity; 2-Pump housing; 21-Inlet channel; 22-Outlet channel; 23-Pump chamber; 24-First opening 25-Second opening end; 3-Impeller; 4-Water distribution plate; 41-Main body; 42-Cylinder body; 421-Rotor cavity; 422-Opening end; 423-Bottom of cylinder; 424-Outer periphery; 425-Threaded hole; 5-Protrusion; 50-Main body; 501-First extension; 502-Second extension; 51-Groove; 511-Trapezoidal channel; 512-Trapezoidal groove; 52-Root; 53-End; 6-Heating device. Detailed Implementation

[0031] The embodiments will now be described with reference to the accompanying drawings.

[0032] Pumps are used in household appliances such as dishwashers. They can provide power to the dishwasher's circulation system and can also be combined with heating elements to heat the water flow for high-temperature washing, thus meeting the dishwasher's washing needs.

[0033] Please refer to Figure 1 and Figure 2 As shown, the pump of this application includes a motor assembly 1, a pump casing 2, an impeller 3, and a water distribution plate 4. The motor assembly 1 includes a stator assembly 11 and a rotor assembly 12. The stator assembly 11 and the water distribution plate 4 are fixedly connected, and the water distribution plate 4 and the pump casing 2 are snap-fitted and fixed.

[0034] Please refer to Figure 3As shown, the stator assembly 11 includes coils 111, stator teeth 112, and stator yokes 113. The stator assembly 11 is formed by stacking multiple square stator laminations along the axial direction. The outer contour of the cross-section of the stator yoke 113 perpendicular to the axial direction is square, and the interior is circular. The insulating skeleton is integrally encapsulated in the stator teeth 112 and the circular inner wall, which facilitates the processing and manufacturing of the stator assembly 11. One end of the stator teeth 112 is connected to the stator yoke 113, and the connection between the stator teeth 112 and the stator yoke 113 is located on the circular inner wall of the stator yoke 113. The other end of the stator teeth 112 extends towards the center of the circle formed by the multiple stator yokes 113. There are nine stator teeth 112, and the stator teeth 112 are distributed in a circular circumferential interval. There are nine coils 111, each corresponding to a stator tooth 112. The coils 111 are wound around the stator teeth 112, which are coated with an insulating skeleton. The coils 111 and stator teeth 112 are aligned and fixed together. The coils 111 wound around the stator teeth 112 form coil winding assemblies 1111. A receiving cavity 13 is provided between adjacent coil winding assemblies 1111. Each stator tooth 112 includes a foot 1121 located at the end of the stator tooth 112 away from the stator yoke 113. The coils 111 are located between the foot 1121 and the stator yoke 113.

[0035] The water distribution plate 4 includes a main body 41, a cylindrical body 42, and a protrusion 5. The cylindrical body 42 includes an open end 422, a bottom 423, and an outer peripheral part 424. The bottom 423 of the cylindrical body 42 is closed, and the open end 422 of the cylindrical body 42 is open. One end of the outer peripheral part 424 is fixedly connected to the bottom 423, and the other end is fixedly connected to the open end 422. The bottom 423 and the open end 422 are located at the two ends of the axial direction of the cylindrical body 42. The open end 422 is connected to the main body 41. The main body 41 extends outward from the open end 422 along the radial direction of the cylindrical body 42. The open end 422, the bottom 423, and the outer peripheral part 424 are integrally injection molded.

[0036] Please refer to Figure 3 As shown, the feet 1121 of the stator assembly 11 are fitted against the outer periphery 424 of the cylinder portion 42. Multiple feet 1121 are arranged circumferentially along the outer periphery 424 of the cylinder portion 42, and are engaged and fixed to the outer periphery 424. The circumference formed by the multiple feet 1121 is interference-fitted with the cylinder portion 42, allowing the stator assembly 11 to be fitted onto the cylinder portion 42 and fixedly connected to it. In the axial direction of the cylinder portion 42, the length of the feet 1121 is less than the length of the outer periphery 424. In the axial direction perpendicular to the cylinder portion 42, the feet 1121 are located between the plane containing the bottom 423 of the cylinder and the plane containing the open end 422.

[0037] Please refer to Figure 4and Figure 11 As shown, the cylindrical body 42 includes a rotor cavity 421, and the bottom 423 of the cylindrical body is the bottom wall of the rotor cavity 421. The rotor assembly 12 is partially housed within the rotor cavity 421. The pump casing 2 includes an inlet channel 21, an outlet channel 22, and a pump chamber 23. The impeller 3 is located within the pump chamber 23. The rotor assembly 12 includes a rotating shaft 121, and the impeller 3 is fixedly connected to the rotating shaft 121, causing the rotor assembly 12 to drive the impeller 3 to rotate. The impeller 3 drives water flow from the inlet channel 21 into the pump chamber 23. The pump chamber 23 and the rotor cavity 421 are connected, allowing some of the water flowing into the pump chamber 23 to enter the rotor cavity 421 under the action of the impeller 3. At this time, the water flow can act as a lubricant for the rotor assembly 12, reducing friction during rotation. Furthermore, the heat generated by the rotor assembly 12 during operation can be carried away by the water flow, improving the heat dissipation capacity of the rotor assembly 12, thereby improving motor performance and extending motor lifespan.

[0038] Please refer to Figure 3 and Figure 4 As shown, the protrusion 5 is fixedly connected to the cylindrical body 42, and the protrusion 5, the main body 41, and the cylindrical body 42 are integrally injection molded. One end of the protrusion 5 is connected to the outer periphery 424 of the cylindrical body 42, and the other end of the protrusion 5 extends away from the cylindrical body 42 in the radial direction of the cylindrical body 42. That is, in the radial direction of the cylindrical body 42, the protrusion 5 extends from the outer periphery 424 of the cylindrical body 42 towards the stator yoke 113. In the circumferential direction of the outer periphery 424 of the cylindrical body 42, the protrusion 5 is partially located between adjacent feet 1121 and between adjacent coils 111. That is, the feet 1121 are located between adjacent protrusions 5, and the coils 111 are at least partially located between adjacent protrusions 5, so that the protrusion 5 can position the feet 1121 and the coils 111, improving the installation efficiency of the stator assembly 11 and the water distribution plate 4.

[0039] The foot 1121 abuts against the outer peripheral portion 424, and the protrusion 5 circumferentially limits the foot 1121, thus fixing the cylinder portion 42 to the stator assembly 11, and engaging the foot 1121 with the cylinder portion 42. When the stator assembly 11 is working, part of the heat generated by the coil 111 is dissipated through contact with the air, and the other part is transferred to the foot 1121 through the stator teeth 112. The heat from the foot 1121 is then transferred to the cylinder portion 42. The water flow entering the rotor cavity 421 carries away the heat from the cylinder portion 42, thereby improving the heat dissipation effect of the motor assembly 1.

[0040] Please refer to Figure 7As shown, both the cylindrical body 42 and the protrusion 5 are integrally injection molded from a high thermal conductivity material. The cylindrical body 42 and the protrusion 5 can also be a mixture of high thermal conductivity material and other materials, as long as they have thermal conductivity, such as thermally conductive plastics, metals, or synthetic thermally conductive materials, such as nylon plastics. The high thermal conductivity material improves the heat dissipation capacity of the motor assembly 1. Since the protrusion 5 is located between adjacent coils 111, the heat generated by the coil 111 can be transferred to the protrusion 5 through the air, and the protrusion 5 transfers the heat to the cylindrical body 42. At this time, the heat generated by the coil 111 can be dissipated either through the stator teeth 112 to the foot 1121, and then to the cylindrical body 42, or directly to the cylindrical body 42 through the protrusion 5. Finally, the heat in the cylindrical body 42 is carried away by the water flow, improving the heat dissipation capacity of the coil 111, reducing heat accumulation in the coil 111, reducing the phenomenon of localized overheating of the coil 111 leading to aging and damage of the circuit, increasing the service life of the motor assembly 1, and saving costs.

[0041] Please refer to Figure 5 and Figure 6 As shown, the protrusion 5 includes a main body 50, a root 52, and an end 53. The main body 50 is located between the root 52 and the end 53. One end of the main body 50 is fixedly connected to the root 52, and the other end of the main body 50 is fixedly connected to the end 53. The root 52 is fixedly connected to the outer periphery 424 of the cylindrical body 42. The end 53 is close to the stator yoke 113 and is located between adjacent coil winding assemblies 1111, that is, the end 53 is located in the receiving cavity 13. There are 9 receiving cavities 13, and each receiving cavity 13 corresponds to a coil 111. There are 9 protrusions 5, and each protrusion 5 corresponds to a receiving cavity 13. In the circumferential direction of the cylinder portion 42, the length of the root portion 52 is less than the distance between two adjacent feet 1121, which facilitates the installation of the stator assembly 11 and improves installation efficiency. Furthermore, the feet 1121 are located between adjacent root portions 52, providing a limiting effect and improving the stability of the stator assembly 11. The root portion 52 is located between two adjacent feet 1121, and the length of the end portion 53 is less than the distance between two adjacent coils 111, with the end portion 53 located between two adjacent coils 111. Since the multiple coils 111 and multiple feet 1121 are distributed in a circular interval, and the feet 1121 are closer to the center of the circle than the coils 111, the length between adjacent feet 1121 is less than the length between coils 111 in the circumferential direction of the cylindrical part 42. The end 53 of the protrusion 5 is close to the coil 111, so that the length of the end 53 is greater than the length of the root 52, which reduces the distance between the protrusion 5 and the coil 111, improves the heat transfer efficiency between the coil 111 and the protrusion 5, and thus improves the heat dissipation effect of the coil 111.

[0042] The protrusion 5 includes a groove 51, with its opening located at the root 52 and its bottom wall at the end 53. The groove 51 communicates with the rotor cavity 421, allowing water flowing into the rotor cavity 421 to enter the groove 51. The protrusion 5 is close to the coil 111, allowing heat from the coil 111 to be quickly transferred to the protrusion 5. Since the water can enter the groove 51 through the rotor cavity 421, it can directly carry away the heat from the protrusion 5. When the pump is working, the temperature of the coil 111 is around 130 degrees Celsius, while the temperature of the water is around 70 degrees Celsius. After the water carries away the heat from the coil 111, its temperature decreases by about 10 to 20 degrees Celsius, improving the safety of the coil 111. The water continuously circulates within the groove 51, continuously carrying away the heat dissipated by the coil 111, improving the heat dissipation capacity of the coil 111, and thus improving the heat dissipation capacity of the motor assembly 1.

[0043] Please refer to Figure 6 As shown, the main body 50 includes a first extension 501 and a second extension 502. One end of the first extension 501 is connected to the root 52, and the other end of the first extension 501 is connected to one end of the second extension 502. The other end of the second extension 502 is connected to the end 53. That is, the first extension 501 is located between the second extension 502 and the root 52, and the second extension 502 is located between the first extension 501 and the root 52. In the circumferential direction of the cylindrical body 42, the length of the connection between the first extension 501 and the second extension 502 is greater than the length of the root, and the length of the connection between the first extension 501 and the second extension 502 is less than the length of the end, so that the outer contour of the cross section of the first extension 501 perpendicular to the axial direction of the cylindrical body 42 is trapezoidal, and the outer contour of the cross section of the second extension 502 perpendicular to the axial direction of the cylindrical body 42 is trapezoidal. The first extension 501 is close to the foot 1121, reducing the distance between the first extension 501 and the foot 1121 and improving the efficiency of the first extension 501 in absorbing heat from the foot 1121. The second extension 502 is close to the coil 111, reducing the distance between the outer wall of the second extension 502 and the coil 111 and improving the efficiency of the second extension 502 in absorbing heat from the coil 111. The included angle formed by the two walls of the first extension 501 is smaller than the included angle formed by the two walls of the second extension 502, improving the space utilization of the receiving cavity 13.

[0044] The groove 51 includes a trapezoidal channel 511 and a trapezoidal slot 512, which are connected. The connection between the groove 51 and the rotor cavity 421 is an opening at one end of the trapezoidal channel 511, the connection between the trapezoidal channel 511 and the trapezoidal slot 512 is an opening at the other end of the trapezoidal channel 511, and the connection between the trapezoidal channel 511 and the trapezoidal slot 512 is an opening at the other end of the trapezoidal channel 511. In a cross-section perpendicular to the axial direction of the cylinder 42, the outer contour of the trapezoidal channel 511 is trapezoidal, and the opening length at the connection between the groove 51 and the rotor cavity 421 is less than the opening length at the connection between the trapezoidal channel 511 and the trapezoidal slot 512, making the outer wall of the trapezoidal channel 511 closer to the coil 111 and improving the heat dissipation effect of the coil.

[0045] Please refer to Figure 9 and Figure 10 As shown, the motor assembly 1 includes screws, the stator assembly 11 includes a fixing hole 114, and the water distribution plate 4 has a threaded hole 425. The screw is adapted to the threaded hole 425, with one end of the screw having the threaded hole passing through the fixing hole 114 and being fixedly connected to the water distribution plate 4, so that the screw portion is located within the fixing hole 114. The stator assembly 11 is engaged with the cylinder part 42 by the foot 1121, and the stator assembly 11 is fixed to the water distribution plate 4 by screws, which improves the stability of the connection between the stator assembly 11 and the water distribution plate 4.

[0046] In some embodiments, please refer to Figure 1 and Figure 12 As shown, the pump in this embodiment of the application further includes a heating device 6. The pump casing 2 is a pipe with openings at both ends. One end of the pump casing 2 is sealed and fixedly connected to the water distribution plate 4, and the other end is fixedly connected to the heating device 6. The motor assembly 1 drives the impeller 3 to rotate, so that water flows into the pump chamber 23 from the water inlet channel 21 and is heated by the heating device 6. Driven by the impeller 3, the water flows out of the pump casing from the pump chamber 23 along the water outlet channel 22. The motor assembly 1 also includes a shaft support 122, which is fixed at the open end 422 to support the rotating shaft 121 and improve the stability of the rotating shaft 121. The shaft support 122 is located between the rotor cavity 421 and the pump cavity 23, and is positioned below the impeller 3. The shaft support 122 also includes a first through hole 1221 and a second through hole 1222. The rotating shaft 121 passes through the first through hole 1221, such that a portion of the rotating shaft 121 is located within the first through hole 1221, and the rotating shaft 121 and the first through hole 1221 have a clearance fit, resulting in a small gap between the rotating shaft 121 and the wall of the first through hole 1221. The second through hole 1222 is located at the circumferential edge of the shaft support 122, and connects the pump cavity 23 and the rotor cavity 421, allowing water in the pump cavity 23 to enter the rotor cavity 421 through the second through hole 1222.

[0047] When the impeller 3 rotates, the outlet of the impeller 3 is located at the circumferential edge of the impeller. At this time, the pressure at the outlet of the impeller 3 is relatively large, while the pressure inside the rotor cavity 421 is relatively small. The water flows into the rotor cavity 421 from the second through hole 1222 of the shaft support 122 or the gap connecting the shaft support 122 and the water distribution plate 4. During the rotation of the impeller 3, the pressure at the connection between the shaft 121 and the impeller 3 is relatively smaller than that at the circumferential edge of the impeller 3. The pressure at the connection between the shaft 121 and the shaft support 122 is also smaller than that at the second through hole 1222. The water in the rotor cavity 421 can flow out along the gap between the shaft 121 and the shaft support 122. The water forms a circulating flow path in the rotor cavity 421. The heat absorbed by the cylinder part 42 or the protrusion 5 from the coil 111 is transferred to the water. The water carries the heat out of the groove 421 under the circulating flow, realizing the heat dissipation of the coil 111.

[0048] This application also proposes a dishwasher, which includes a body, a circulation system and a pump as described in the above embodiment. The body includes an inner tank and a water cup, the circulation system is connected to the inner tank and the water cup, and the pump provides power to the circulation system.

[0049] In other embodiments, please refer to Figure 5 The protrusion 5 is made of a heat-conducting metal material, such as aluminum or stainless steel. The protrusion 5 is heat-fused to the water distribution plate 4, so that part of the protrusion 5 is attached to the wall of the rotor cavity 421, part of it passes through the wall of the rotor cavity 421, and extends towards the stator yoke 113. This allows the heat emitted by the coil 111 to be transferred to the protrusion 5. The part of the protrusion 5 located outside the cylinder 42 transfers heat to the part of the protrusion 5 located inside the rotor cavity 421. The part of the protrusion 5 located inside the rotor cavity 421 is in direct contact with the water flow, which improves the heat dissipation effect.

[0050] In the description of this application, "a plurality of" means at least two, such as two or three, unless otherwise explicitly specified. The use of terms such as "an embodiment," "some embodiments," or "specific example" indicates that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0051] In this application, unless otherwise expressly specified and limited, the terms "connected," "linked," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0052] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above" or "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below" or "below" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

Claims

1. A pump comprising a motor assembly (1), a pump housing (2), and an impeller (3), said motor assembly (1) comprising a stator assembly (11) and a rotor assembly (12), said pump having a pump chamber (23), the impeller (3) being housed in said pump chamber (23), characterized in that, The pump also includes a water distribution plate (4), the first open end (24) of the pump casing (2) is fixedly connected to the water distribution plate (4), a part of the water distribution plate (4) facing the pump cavity (23) is a part of the wall of the pump cavity (23), the pump has an inlet channel (21) and an outlet channel (22), the inlet channel (21) is connected to the pump cavity (23), and the outlet channel (22) is connected to the pump cavity (23); The motor assembly (1) further includes a plurality of coils (111), the stator assembly (11) includes a plurality of stator teeth (112), the plurality of stator teeth (112) are arranged circumferentially, the coils (111) correspond to the stator teeth (112), the coils (111) are wound around the stator teeth (112) to form coil winding assemblies (1111), and there is a receiving cavity (13) between adjacent coil winding assemblies (1111). The water distribution plate (4) includes a cylindrical part (42) and at least one protrusion (5). The water distribution plate (4) is made of a heat-conducting material. The cylindrical part (42) has a rotor cavity (421). At least a portion of the rotor assembly (12) is housed in the rotor cavity (421). The stator assembly (11) is sleeved on the outer periphery (424) of the cylindrical part (42). The protrusion (5) protrudes from the outer periphery (424). A portion of the protrusion (5) is housed in the receiving cavity (13). A portion of the protrusion (5) is located between adjacent coil winding assemblies (1111). The protrusion (5) includes a root (52) and an end (53). The root (52) is connected to the outer peripheral portion (424). The end (53) is accommodated in the receiving cavity (13). The protrusion (5) includes a groove (51). The opening of the groove (51) is located at the root (52). The bottom wall of the groove (51) is located at the end (53). The groove (51) communicates with the rotor cavity (421).

2. The pump of claim 1, wherein The pump also includes a heating device (6), the second opening end (25) of the pump casing (2) is fixedly connected to the heating device (6), the water inlet channel (21) is located in the heating device (6), and the rotor cavity (421) is connected to the pump cavity (23).

3. The pump according to claim 1, characterized in that, In the circumferential direction of the cylindrical portion (42), the length of the end portion (53) is greater than the length of the root portion (52).

4. The pump according to claim 2, characterized in that, The protrusion (5) includes a main body (50) located between the root (52) and the end (53). The main body (50) includes a first extension (501) and a second extension (502). The first extension (501) is located between the root (52) and the second extension (502), and the second extension (502) is located between the end (53) and the first extension (501). In the circumferential direction of the cylindrical body (42), the length of the connection between the first extension (501) and the second extension (502) is greater than the length of the root (52), such that the wall of the first extension (501) abuts against the stator tooth (112); the length of the connection between the first extension (501) and the second extension (502) is less than the length of the end (53), such that the wall of the second extension (502) abuts against the coil (111).

5. The pump according to claim 4, characterized in that, The first extension (501) has a trapezoidal channel (511), and the second extension (502) has a trapezoidal groove (512). One end of the trapezoidal channel (511) is connected to the trapezoidal groove (512), and the other end of the trapezoidal channel (511) is connected to the rotor cavity (421). The trapezoidal channel (511) connects the rotor cavity (421) and the trapezoidal groove (512).

6. The pump according to claim 3, characterized in that, The stator tooth (112) includes a foot (1121) that abuts against the outer peripheral portion (424). The foot (1121) is located between adjacent protrusions (5). In the circumferential direction of the cylindrical portion (42), the distance between adjacent feet (1121) is greater than the length of the root portion (52), and the distance between adjacent coils (111) is greater than the length of the end portion (53). In the axial direction of the cylindrical portion (42), the stator assembly (11) is engaged and fixed with the body portion (41) of the water distribution plate (4).

7. The pump according to claim 1, characterized in that, The cylindrical part (42) includes a bottom part (423) and an open end part (422). In the axial direction of the cylindrical part (42), the bottom part (423) is fixedly connected to one end of the outer peripheral part (424), and the open end part (422) is fixedly connected to the other end of the outer peripheral part (424). In the direction perpendicular to the axial direction of the cylindrical part (42), the protrusion (5) is accommodated between the plane where the bottom part (423) is located and the plane where the open end part (422) is located.

8. The pump according to claim 7, characterized in that, The water distribution plate (4) includes a body part (41), which is connected to the opening end (422). The body part (41) extends radially outward along the opening end (422). The body part (41), the cylindrical part (42), and the protrusion (5) are integrally injection molded.

9. The pump according to claim 1, characterized in that, The pump also includes a shaft support (122), the rotor assembly (12) includes a rotating shaft (121), the shaft support (122) is fixedly connected to the open end (422) of the cylindrical part (42), the shaft support (122) has a first through hole (1221) and a second through hole (1222), the rotating shaft (121) is partially accommodated in the first through hole (1221), and the second through hole (1222) connects the rotor cavity (421) and the pump cavity (23).

10. A dishwasher, characterized in that, The device includes a body, a circulation system, and a pump according to any one of claims 1 to 9, wherein the body includes an inner liner and a water cup, the circulation system is connected to the inner liner and the water cup, and the pump provides power to the circulation system.

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