Heat pump and dishwasher

Abstract

The present invention provides a heat pump and a dishwasher using the heat pump. The heat pump includes: a housing with a cavity formed inside, the cavity having a water inlet and a water outlet; a heating element integrally formed with at least part of the housing; and an impeller assembly rotatably mounted on the housing, with part of the impeller assembly located inside the cavity. By integrally forming the heating element with at least part of the housing and using the existing space in the housing to accommodate the heating body, the above heat pump can reduce the overall space occupation ratio, improve the space utilization rate, and facilitate the miniaturization of the product; at the same time, it reduces the assembly process of assembling the heating element onto the housing and improves the assembly efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical appliances, and particularly to a heating pump and a dishwasher. Background Art

[0002] In product development, there are often requirements for both heating a fluid and pumping the heated fluid. The traditional treatment method generally involves setting up a heating device and a fluid device, which results in a complex device structure and a large volume; especially for household appliances, the excessive volume occupies a large area and is not conducive to household use. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a heating pump, which integrally forms a heating element with at least part of the housing, and uses the existing space in the housing to accommodate the heating body, which can reduce the overall space occupation ratio, reduce the assembly process, and improve the assembly efficiency.

[0004] The present invention also provides a dishwasher having the above heating pump.

[0005] The heating pump according to the first aspect embodiment of the present invention includes: a housing having a cavity therein, the cavity having a water inlet and a water outlet; a heating element integrally formed with the housing; and an impeller assembly rotatably mounted in the housing, and at least part of the impeller assembly is located in the cavity.

[0006] The heating pump according to the embodiment of the invention has at least the following beneficial effects: by integrally forming the heating element with at least part of the housing, and using the existing space in the housing to accommodate the heating body, the overall space occupation ratio can be reduced, the space utilization rate can be improved, and it is beneficial to the miniaturization of the product; at the same time, the assembly process of assembling the heating element to the housing is reduced, and the assembly efficiency is improved.

[0007] According to some embodiments of the present invention, the heating element and at least part of the housing are integrally formed by die casting or squeeze casting.

[0008] According to some embodiments of the present invention, the heating element includes a working part for generating heat and a wiring part for connecting electricity, at least part of the working part is wrapped in the side wall of the housing, and at least part of the wiring part is located outside the housing.

[0009] According to some embodiments of the present invention, the entire working part is wrapped in the side wall of the housing.

[0010] According to some embodiments of the present invention, the housing includes a detachable upper pump housing and a lower pump housing, the cavity is provided in the upper pump housing, the impeller assembly is mounted in the lower pump housing, and the heating element is integrally formed with the upper pump housing.

[0011] According to some embodiments of the present invention, the upper pump housing is made of metal.

[0012] According to some embodiments of the present invention, the lower pump housing is made of plastic.

[0013] According to some embodiments of the present invention, from the maximum outer diameter of the impeller assembly to the side wall of the cavity, the depth of the cavity gradually increases.

[0014] According to some embodiments of the present invention, the cavity is in a cylindrical shape, the bottom of the cavity is recessed inward, and the middle part of the bottom surface of the cavity is flat.

[0015] According to some embodiments of the present invention, the heating element is in an inverted triangular spiral shape.

[0016] According to some embodiments of the present invention, from the maximum outer diameter of the impeller assembly to the side wall of the cavity, the depth of the cavity gradually decreases.

[0017] According to some embodiments of the present invention, the cavity is in a cylindrical shape, the bottom of the cavity protrudes outward, and the middle part of the bottom surface of the cavity is flat.

[0018] According to some embodiments of the present invention, the heating element is in a triangular spiral shape.

[0019] According to some embodiments of the present invention, from the maximum outer diameter of the impeller assembly to the side wall of the cavity, the depth of the cavity is consistent.

[0020] According to some embodiments of the present invention, the shape of the cavity is cylindrical.

[0021] According to some embodiments of the present invention, the heating element is in a disc shape.

[0022] According to some embodiments of the present invention, a baffle is protruding on the lower pump housing, the baffle is located inside the cavity, and the inner side surface of the baffle facing the impeller assembly is in an involute spiral shape.

[0023] According to some embodiments of the present invention, the distance from the outer side surface of the baffle away from the impeller assembly to the inner side wall of the cavity and the distance from the baffle to the heating element are in an inverse correlation relationship.

[0024] According to some embodiments of the present invention, a coating is provided on the inner side wall of the cavity.

[0025] According to some embodiments of the present invention, the impeller assembly includes a semi-open impeller.

[0026] The dishwasher according to the embodiment of the second aspect of the present invention includes the heating pump according to the embodiment of the first aspect.

[0027] The dishwasher according to the embodiments of the invention has at least the following beneficial effects: In the above dishwasher, the heating pump integrally forms the heating element with at least part of the housing, and uses the existing space of the housing to accommodate the heating body, which can reduce the overall space occupation ratio, improve the space utilization rate, and facilitate the miniaturization of the product; at the same time, the assembly process of assembling the heating element onto the housing is reduced, and the assembly efficiency is improved. Since the volume of the heating pump can be reduced, the installation space required for it on the dishwasher is also correspondingly reduced, and thus the effective capacity of the dishwasher can be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of the first embodiment of the heating pump of the present invention;

[0029] Figure 2 is a cross-sectional schematic diagram of the first embodiment of the heating pump of the present invention;

[0030] Figure 3 is a schematic diagram of the lower pump housing and the impeller assembly in the first embodiment of the heating pump of the present invention Figure 1 ;

[0031] Figure 4 is a schematic diagram of the lower pump housing and the impeller assembly in the first embodiment of the heating pump of the present invention Figure 2 ;

[0032] Figure 5 is a schematic diagram of the heating element in the first embodiment of the heating pump of the present invention;

[0033] Figure 6 is a cross-sectional schematic diagram of the second embodiment of the heating pump of the present invention;

[0034] Figure 7 is a schematic diagram of the heating element in the second embodiment of the heating pump of the present invention;

[0035] Figure 8 is a cross-sectional schematic diagram of the third embodiment of the heating pump of the present invention;

[0036] Figure 9 is a schematic diagram of the heating element in the third embodiment of the heating pump of the present invention.

[0037] Reference Numerals in the Drawings:

[0038] Housing 100; Cavity 110; Water inlet 120; Water outlet 130; Upper pump housing 140; Lower pump housing 150; Through hole 160; Pipe 170;

[0039] Heating element 200; Working part 210; Wiring part 220;

[0040] Impeller assembly 300; motor 310; bottom plate 320; blade 330;

[0041] Baffle 400; inner side 410; outer side 420; gap S. Detailed implementation mode

[0042] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0043] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as up and down, etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0044] In the description of the present invention, "plurality" means more than two. If the first and second are described only for the purpose of distinguishing technical features, they should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0045] In the description of the present invention, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0046] Heating pumps are often used for heating and pumping fluids. Existing heating pumps generally reserve an installation position on the pump housing for installing the heating component. After the housing is manufactured, the heating component is installed on the housing. The two are independently manufactured and then assembled, and the installation process is relatively complicated; in order to install the heating component, there must be an operating space, and this factor needs to be considered when designing the housing, which is not conducive to the miniaturization design of the housing; moreover, the housing and the heating component each independently occupy space, and the overall occupied space is relatively large.

[0047] Such as Figures 1 to 5As shown, it is a schematic diagram of the first embodiment of a heat pump, which includes a housing 100, a heating element 200, and an impeller assembly 300. Inside the housing 100, there is a cavity 110, which has a water inlet 120 and a water outlet 130. Both the water inlet 120 and the water outlet 130 are connected to the cavity 110 to allow fluid to flow in and out. The heating element 200 is integrally die-cast with the housing 100 to form an integrated structure. Die-casting is a process in which molten metal is injected at high speed into a precision metal mold cavity under high pressure, and the molten metal cools and solidifies under pressure to form a casting. The impeller assembly 300 is rotatably mounted on the housing 100, and a part of the impeller assembly 300 is located inside the cavity 110, and is used to drive the fluid in the cavity 110 to flow from the water inlet 120 to the water outlet 130. Specifically, the output part of the impeller assembly 300 is located inside the cavity 110. Those skilled in the art can understand that the heating element 200 can also be integrally formed with the housing 100 in other ways. For example, the heating element 200 can be integrally formed with the housing 100 by squeeze casting. Squeeze casting is a method in which liquid or semi-solid metal solidifies and flows under high pressure to directly obtain a workpiece or blank. It has the advantages of high utilization rate of liquid metal, simplified process, and stable quality.

[0048] By integrally forming the heating element 200 with the housing 100, the above heat pump can utilize the existing space in the housing 100 to accommodate the heating body, reducing the overall space occupation ratio, improving the space utilization rate, and facilitating the miniaturization design of the product. At the same time, the assembly process of assembling the heating element 200 onto the housing 100 is reduced, improving the assembly efficiency.

[0049] It should be noted that the heating element 200 can be partially wrapped by the side wall of the housing 100 or completely wrapped by the housing 100.

[0050] Specifically, as Figure 2 shown, the heating element 200 includes a working part 210 for generating heat and a wiring part 220 for connecting to electricity. The working part 210 is completely wrapped inside the side wall of the housing 100, and at least a part of the wiring part 220 is located outside the housing 100 for docking with the power cord. In this embodiment, the working part 210 is completely located inside the side wall of the housing 100, and the heat generated by the working part 210 is all transferred to the housing 100, and then the housing 100 heats the fluid in the cavity 110, which can uniformly heat the fluid in the cavity 110. The working part 210 does not need to directly contact the fluid to be heated, which can effectively ensure the service life of the working part 210.

[0051] Of course, those skilled in the art can understand that the working part 210 is not limited to the above embodiments, and it can also be implemented in a way that part of it is wrapped by the side wall of the housing 100. For example, in some usage scenarios where rapid heating of the fluid is required, at least one surface of the working part 210 is exposed outside the side wall of the housing 100, and the rest is wrapped by the side wall of the housing 100. At this time, a part of the working part 210 can directly contact the fluid to be heated and directly perform heat exchange to achieve the purpose of rapidly heating the fluid. After this embodiment is started, the heating element 200 heats the liquid and the upper pump housing 140 synchronously; after the embodiment in which the heating element 200 is entirely wrapped by the side wall of the upper pump housing 140 is started, the heating element 200 first heats the upper pump housing 140, and then heats the liquid through the upper pump housing 140. All the heat emitted by the heating element 200 needs to pass through the upper pump housing 140 before being transferred to the liquid; as can be seen from the above, this embodiment can reduce the response time from the start of work to the set temperature compared with the embodiment in which the heating element 200 is entirely wrapped by the side wall of the upper pump housing 140.

[0052] For example, the heating element 200 uses an electric heating tube in the existing mature technology. During die-casting, the electric heating tube is first placed in the mold, and then metal is injected into the mold. The metal and the electric heating tube are integrally die-cast in the mold.

[0053] As Figure 1 and Figure 2 As shown in the figure, in some embodiments of the present invention, the housing 100 includes an upper pump housing 140 and a lower pump housing 150. The upper pump housing 140 and the lower pump housing 150 are detachably connected. Thus, the upper pump housing 140 and the lower pump housing 150 are manufactured independently and then assembled together. Specifically, the upper pump housing 140 and the lower pump housing 150 can be connected together by a threaded structure or bolts or screws; the cavity 110 is provided in the upper pump housing 140, the water inlet 120 and the water outlet 130 are both provided in the upper pump housing 140, the impeller assembly 300 is installed in the lower pump housing 150, a part of the impeller assembly 300 protrudes upward relative to the lower pump housing 150 and is located in the cavity 110, and the heating element 200 is integrally die-cast with the upper pump housing 140 to form an integral structure.

[0054] The housing 100 is divided into two parts, which can reduce the processing difficulty, improve the processing efficiency, and reduce the processing cost. At the same time, it also enables the upper pump housing 140 and the lower pump housing 150 to select appropriate materials for manufacturing according to actual needs, which is conducive to reducing the overall cost. For example, since the upper pump housing 140 needs to bear high temperature and play the role of quickly transferring heat, the upper pump housing 140 can be made of metal material, which is conducive to quickly transferring the heat on the working part 210 to the fluid, and at the same time, the upper pump housing 140 will not deform due to the too high temperature of the working part 210; the lower pump housing 150 needs to bear the role of installing the impeller assembly 300 and closing the cavity 110 and does not need to withstand high temperature, so the lower pump housing 150 can be made of plastic material. For example, the lower pump housing 150 can be made of polyurethane plastic or epoxy plastic, etc.; the plastic lower pump housing 150 is conducive to processing and has a low cost.

[0055] Specifically, the upper pump housing 140 can be made of aluminum material. Aluminum die-casting can relatively easily produce complex shapes so as to integrally form the structure on the upper pump housing 140, and it has good thermal conductivity. During manufacturing, the heating element 200 is placed in the mold and then integrally die-cast with the aluminum material; of course, the upper pump housing 140 can also be made of copper or other metal materials, which can all play the role of quickly conducting heat and withstanding high temperature.

[0056] It should be noted that the installation implementation manners of the cavity 110 and the impeller assembly 300 are not limited to the above embodiments. The installation positions of the cavity 110 and the impeller assembly 300 can be swapped, that is, the cavity 110 can be arranged in the lower pump housing 150, the water inlet 120 and the water outlet 130 are both arranged in the lower pump housing 150, the impeller assembly 300 can be installed in the upper pump housing 140, the lower pump housing 150 is integrally die-cast with the heating element 200 using metal material, and the upper pump housing 140 is made of plastic material to reduce the processing difficulty and material cost, etc. This implementation manner can also achieve the same function.

[0057] In addition, those skilled in the art can understand that the housing 100 is not limited to being made in two parts. In some embodiments of the present invention, the housing 100 can also be integrally manufactured to reduce the assembly process and improve the overall structural strength.

[0058] Such as Figure 1 、 Figure 2 and Figure 5As shown, in some embodiments of the present invention, the cavity 110 in the upper pump housing 140 is generally in a barrel shape, the depth of the cavity 110 is in a changing state, the bottom of the cavity 110 is recessed inward. Specifically, the middle part of the bottom surface of the cavity is flat, and the remaining part of the bottom surface of the cavity is in a conical shape. The impeller assembly 300 is a centrifugal structure. From the maximum outer diameter of the part of the impeller assembly 300 located in the cavity 110 to the side wall of the cavity 110, the depth of the cavity 110 gradually increases. In this embodiment, after the liquid driven by the impeller assembly 300 leaves the impeller assembly 300, the cross-sectional area for the liquid to flow through gradually becomes larger, which can slow down the liquid flow speed, so that the liquid can have a stable transition, more conform to the fluid design principle, reduce the generation of turbulence, and is beneficial to improving the hydraulic efficiency.

[0059] Specifically, a through hole 160 is provided in the middle part of the bottom surface of the cavity 110. The water inlet 120 is connected to the through hole 160 through a section of bent pipe, so as to be connected to the cavity 110. The water inlet 120 and the water outlet 130 are arranged in parallel, which is convenient for the staff to connect the pipelines at the same working station, reduces the back-and-forth movement of the staff, and improves the work efficiency.

[0060] In order to be close to the cavity 110, the heating element 200 is in an inverted triangular spiral structure. The heating element 200 is located in the part of the bottom surface of the cavity that is in a conical shape. The heating element 200 is formed by coiling a heating pipe and has at least two turns, so as to be able to uniformly heat the upper pump housing 140. It should be noted that the number of turns of the heating pipe coiling is set according to the diameter of the cavity 110. The larger the cavity 110, the more turns of the heating pipe coiling, and the more contact area with the upper pump housing 140, making the heating more uniform and efficient.

[0061] As Figure 6 As shown, in some embodiments of the present invention, the cavity 110 in the upper pump housing 140 is generally in a barrel shape, the depth of the cavity 110 is in a changing state, the bottom of the cavity 110 bulges outward. Specifically, the middle part of the bottom surface of the cavity 110 is flat, and the remaining part of the bottom surface of the cavity 110 is in a conical shape. The impeller assembly 300 is a centrifugal structure. From the maximum outer diameter of the part of the impeller assembly 300 located in the cavity 110 to the side wall of the cavity 110, the depth of the cavity 110 gradually decreases. When the height of the edge of the cavity 110 remains unchanged, this embodiment can increase the space inside the cavity 110, so that the effective accommodation space of the cavity 110 is increased.

[0062] Specifically, a through hole 160 is provided in the middle part of the bottom surface of the cavity 110. The water inlet 120 is connected to the through hole 160 through a section of bent pipe 170, so as to be connected to the cavity 110. The water inlet 120 and the water outlet 130 are arranged in parallel, which is convenient for the staff to connect the pipelines at the same working station, reduces the back-and-forth movement of the staff, and improves the work efficiency.

[0063] As shown Figure 7 in FIG. X, in order to be close to the cavity 110, the heating member 200 has a triangular spiral structure. The heating member 200 is located in the conical part of the bottom surface of the cavity 110. The heating member 200 is formed by coiling a heating pipe and has at least two turns, so as to be able to uniformly heat the upper pump housing 140. It should be noted that the number of turns of the heating pipe is set according to the diameter of the cavity 110. The larger the cavity 110, the more turns the heating pipe has, and the more contact area with the upper pump housing 140, making the heating more uniform and efficient.

[0064] As shown Figure 8 in FIG. Y, in some embodiments of the present invention, the cavity 110 in the upper pump housing 140 is cylindrical and the depth of the cavity 110 is consistent. This embodiment can take into account both the fluid flow performance and the space utilization rate of the cavity 110, which is very practical.

[0065] For example, a through hole 160 is provided at the middle position of the bottom surface of the cavity 110. The water inlet 120 is connected to the through hole 160 through a section of curved pipe 170, so as to be connected to the cavity 110. The water inlet 120 and the water outlet 130 are arranged in parallel, which is convenient for the staff to connect the pipelines at the same working station, reducing the back-and-forth movement of the staff and improving the work efficiency.

[0066] As shown Figure 9 in FIG. Z, in order to be close to the cavity 110, the heating member 200 has a disc-shaped structure. The heating member 200 is located in the bottom surface of the cavity 110. The heating member 200 is formed by coiling a heating pipe and has at least two turns, so as to be able to uniformly heat the upper pump housing 140. It should be noted that the number of turns of the heating pipe is set according to the diameter of the cavity 110. The larger the cavity 110, the more turns the heating pipe has, and the more contact area with the upper pump housing 140, making the heating more uniform and efficient.

[0067] As shown Figures 2 to 4 in FIG. A, in some embodiments of the present invention, a baffle 400 protrudes from the lower pump housing 150. After the upper pump housing 140 and the lower pump housing 150 are assembled, the baffle 400 is located in the cavity 110. The inner side surface 410 of the baffle 400 facing the impeller assembly 300 is in an involute spiral shape to guide the flow of the fluid driven by the impeller, reduce the generation of turbulence, and is beneficial to improving the hydraulic efficiency.

[0068] Among them, the baffle 400 can be integrally formed with the lower pump housing 150 or can be separately manufactured and then assembled.

[0069] As shown Figures 2 to 4As shown, since the baffle 400 is located in the cavity 110 and is relatively close to the heating element 200, when the baffle 400 is made of plastic material, the temperature effect of the heating element 200 on the baffle 400 needs to be considered. For this reason, in some embodiments of the present invention, there is a gap S between the outer side 420 of the baffle 400 away from the impeller assembly 300 and the inner side wall of the cavity 110. The closer the baffle 400 is to the heating element 200, the larger the gap S is. The farther the baffle 400 is from the heating element 200, the smaller the gap S is. When the gap S is large, more fluid flows through the gap S, which can take away more heat, prevent the baffle 400 from being deformed due to excessive temperature, and ensure the service life of the baffle 400. When the baffle 400 is far away from the heating element 200, the heat dissipation demand here is not high, and thus a large flow rate is not required, so a large gap is not required.

[0070] In addition, in order to avoid turbulence when the liquid enters and exits the gap S, inclined surfaces are provided at both ends of the baffle 400. The inclined surfaces guide the liquid into the gap S, which can effectively reduce the turbulence when the liquid enters and exits the gap S, thereby improving the overall hydraulic efficiency. The top of the baffle 400 also adopts a curved surface with a smooth transition, which can reduce the turbulence when the liquid flows through this place, thereby further improving the overall hydraulic efficiency.

[0071] In some usage scenarios, the fluid flowing through the cavity 110 is corrosive to a certain extent. In order to ensure the service life of the housing 100, a coating is provided on the inner wall of the cavity 110 to prevent the fluid from directly contacting the housing 100. Specifically, when the upper pump housing 140 is made of metal material, a coating needs to be provided on the inner wall of the cavity 110 of the upper pump housing 140. The coating can specifically be made of polytetrafluoroethylene (Teflon), which has the characteristics of acid and alkali resistance and resistance to various organic solvents, and can effectively protect the upper pump housing 140 from being corroded by the fluid.

[0072] Of course, those skilled in the art will appreciate that the specific implementation of the coating is not limited to the above-mentioned polytetrafluoroethylene material, and other embodiments may also be used. For example, the coating may also be made of epoxy resin material, and so on.

[0073] like Figure 2 , Figure 6 , Figure 8As shown, in some embodiments of the present invention, the impeller assembly 300 includes a semi-open impeller and a motor 310. The semi-open impeller is located in the cavity 110, and the motor 310 is installed in the lower pump housing 150. The semi-open impeller includes a bottom plate 320 and a plurality of blades 330. Threaded holes are provided on the lower side of the bottom plate 320, and the threaded holes are threadedly connected to the rotating shaft of the motor 310. The blades 330 are installed on the upper side of the bottom plate 320, and the plurality of blades 330 are annularly distributed. The through hole 160 is aligned with the rotating shaft of the motor 310. The water inlet is communicated with the through hole 160 through a pipe 170 with a 90° angle. The center line of the water outlet 130 is perpendicular to the rotating shaft of the motor. After the water entering from the water inlet 120 is guided and turned by the pipe 170, it enters between the blades 330 along the direction of the motor rotating shaft, is blocked by the bottom plate 320, and then is driven to rotate by the rotating blades 330. Under the action of centrifugal force, it moves outward and is discharged from the water outlet 130 under the guidance of the baffle 400. Such a setting can drive the fluid entering from the water inlet 120 to the water outlet 130 quickly to a large extent, improving the overall hydraulic efficiency.

[0074] The specific working principle of the above-mentioned heat pump is as follows: After the heat pump is started, the liquid enters from the water inlet 120, flows through the pipe 170. Under the guidance of the pipe 170, the flow direction of the liquid changes to the same direction as the rotating shaft of the motor 310. The liquid enters the cavity 110 from the through hole 160. The heating element 200 heats the water in the cavity 110. The heated water is driven by the blades 330 and leaves the range of the blades 330 in a centrifugal manner, and is discharged from the water outlet 130 under the guidance of the baffle 400.

[0075] The present invention also provides a dishwasher, including the heat pump of any of the above embodiments. The heat pump in the above dishwasher is integrally die-cast by integrating the heating element 200 with the housing 100. By using the existing space of the housing 100 to accommodate the heating body, the overall space occupation ratio can be reduced, the space utilization rate can be improved, and it is beneficial to the miniaturization of the product. At the same time, the assembly process of assembling the heating element 200 onto the housing 100 is reduced, improving the assembly efficiency. Since the volume of the heat pump can be reduced, the installation space required for it on the dishwasher is also correspondingly reduced, and thus the effective capacity of the dishwasher can be improved.

[0076] The above has described the embodiments of the present invention in detail with reference to the drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention.

Claims

1. A heat pump, characterized in that, Comprising: A housing having a cavity inside, the cavity having a water inlet and a water outlet; A heating element integrally formed with at least part of the housing; An impeller assembly rotatably mounted on the housing, and at least part of the impeller assembly is located inside the cavity; The housing includes an upper pump housing and a lower pump housing detachably connected, the cavity is provided in the upper pump housing, and the heating element is integrally formed with the upper pump housing; The impeller assembly includes an impeller and a motor, the impeller is located in the cavity, and the motor is installed inside the lower pump housing; A baffle protrudes from the lower pump housing, the baffle is located inside the cavity, the inner side surface of the baffle facing the impeller assembly is in an involute spiral shape, and the distance from the outer side surface of the baffle away from the impeller assembly to the inner side wall of the cavity and the distance from the baffle to the heating element are in an inverse correlation relationship; The heating element and at least part of the housing are integrally formed by die casting or squeeze casting.

2. The heat pump according to claim 1, characterized in that, The heating element includes a working part for generating heat and a wiring part for connecting electricity, at least part of the working part is wrapped inside the side wall of the housing, and at least part of the wiring part is located outside the housing.

3. The heat pump according to claim 2, characterized in that, The entire working part is wrapped inside the side wall of the housing.

4. The heat pump according to claim 1, characterized in that, The upper pump housing is made of metal.

5. The heat pump according to claim 1, characterized in that, The lower pump housing is made of plastic material.

6. The heat pump according to claim 1, characterized in that, From the maximum outer diameter of the impeller assembly to the side wall of the cavity, the depth of the cavity gradually increases.

7. The heat pump according to claim 6, characterized in that, The cavity is in a cylindrical shape, the bottom of the cavity is recessed inward, and the middle part of the bottom surface of the cavity is flat.

8. The heat pump according to claim 7, characterized in that, The heating element is in an inverted triangular spiral shape.

9. The heat pump according to claim 1, characterized in that, From the maximum outer diameter of the impeller assembly to the side wall of the cavity, the depth of the cavity gradually decreases.

10. The heat pump according to claim 9, characterized in that, The cavity is in a cylindrical shape, the bottom of the cavity protrudes outward, and the middle part of the bottom surface of the cavity is flat.

11. The heat pump according to claim 10, wherein, The heating element is in a triangular spiral shape.

12. The heat pump according to claim 1, characterized in that, From the maximum outer diameter of the impeller assembly to the side wall of the cavity, the depth of the cavity is consistent.

13. The heat pump according to claim 12, characterized in that, The shape of the cavity is cylindrical.

14. The heat pump according to claim 13, characterized in that, The heating element is in a disc shape.

15. The heat pump according to claim 1, characterized in that, There is a gap between the outer side surface of the baffle away from the impeller assembly and the inner side wall of the cavity, and inclined surfaces are provided at both ends of the baffle to guide the liquid into the gap.

16. The heat pump according to claim 15, characterized in that, The top of the baffle is smoothly transitioned with a curved surface.

17. The heat pump according to claim 1, characterized in that, The inner side wall of the cavity is provided with a coating.

18. The heat pump according to claim 1, characterized in that, The impeller assembly includes a semi-open impeller.

19. A dishwasher, characterized in that, Including the heating pump according to any one of claims 1 to 18.

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