HEAT PUMP, AND DISH WASHING MACHINE

Abstract

 A heating pump and a dish washing machine using same, the heating pump comprising: a housing (100), which is internally provided with a cavity (110), wherein the cavity (110) is provided with a water inlet (120) and a water outlet (130); a heating member (200), wherein the heating member and at least a part of the housing (100) are integrally formed; and an impeller assembly (300), which is rotatably mounted on the housing (100), wherein the impeller assembly (300) is partially positioned in the cavity (110).

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The present disclosure claims priority to Chinese Patent Application No. 202111209493.6, filed October 18, 2021 and entitled "HEATING PUMP AND DISH WASHING MACHINE", and Chinese Patent Application No. 202122511444.X, filed October 18, 2021 and entitled "HEATING PUMP AND DISH WASHING MACHINE", the entire contents of each of which are incorporated herein by reference for all purposes.

TECHNICAL FIELD

[0002] The present disclosure relates to the field of electrical appliances, and in particular, to a heating pump and a dish washing machine.

BACKGROUND

[0003] In the development of products, it is often required to heat the fluid and pump the heated fluid. A conventional method is generally to provide a heating device and a fluid device, which results in complex structure and large volume. With respect to household appliances, an excessive volume occupies a large space, which is not conducive to household use.

SUMMARY

[0004] The present disclosure aims to resolve at least one of the problems existing in the existing technology. To this end, embodiments of the present disclosure propose a heating pump, where a heating element and at least a part of a housing are integrally formed, and the heating element is accommodated in an existing space of the housing, which can reduce overall space occupation, while simplifying assembly processes and improving assembly efficiency.

[0005] The embodiments of the present disclosure further propose a dish washing machine equipped with the heating pump.

[0006] According to a first aspect of the present disclosure, an embodiment provides a heating pump, including: a housing internally provided with a cavity, the cavity having a water inlet and a water outlet; a heating element integrally formed with the housing; and an impeller assembly rotatably installed in the housing, where the impeller assembly is partially positioned in the cavity.

[0007] The heating pump according to this embodiment of the present disclosure has at least the following effects. In the heating pump, the heating element and at least a part of the housing are integrally formed, and the heating element is accommodated in an existing space of the housing, which can improve space utilization by reducing overall space occupation, and facilitate product miniaturization. In addition, assembly processes of installing the heating element in the housing can be simplified, and thus the assembly efficiency can be improved.

[0008] According to some embodiments of the present disclosure, the heating element is integrally formed with the at least a part of the housing by a way of die casting or squeeze casting.

[0009] According to some embodiments of the present disclosure, the heating element includes a working portion for generating heat and a wiring portion for power connection, the working portion is at least partially wrapped within a side wall of the housing, and the wiring portion is at least partially positioned outside the housing.

[0010] According to some embodiments of the present disclosure, the working portion is entirely wrapped within the side wall of the housing.

[0011] According to some embodiments of the present disclosure, the housing includes an upper housing part and a lower housing part which are detachably connected to each other, the cavity is arranged in the upper housing part, the impeller assembly is installed in the lower housing part, and the heating element and the upper housing part are integrally formed.

[0012] According to some embodiments of the present disclosure, the upper housing part is made of metal.

[0013] According to some embodiments of the present disclosure, the lower housing part is made of plastic.

[0014] According to some embodiments of the present disclosure, a depth of the cavity is gradually increased along a direction from a position at a maximum outer diameter of the impeller assembly toward a side wall of the cavity.

[0015] According to some embodiments of the present disclosure, the cavity is barrel-shaped, a bottom of the cavity is inwardly recessed, and a central portion of a bottom surface of the cavity is flat.

[0016] According to some embodiments of the present disclosure, the heating element is in a shape of an inverted triangular spiral.

[0017] According to some embodiments of the present disclosure, a depth of the cavity is gradually decreased along a direction from a position at a maximum outer diameter of the impeller assembly toward a side wall of the cavity.

[0018] According to some embodiments of the present disclosure, the cavity is barrel-shaped, a bottom of the cavity is outwardly projected, and a central portion of a bottom surface of the cavity is flat.

[0019] According to some embodiments of the present disclosure, the heating element is in a shape of a triangular spiral.

[0020] According to some embodiments of the present disclosure, a depth of the cavity is consistent along a direction from a position at a maximum outer diameter of the impeller assembly toward a side wall of the cavity.

[0021] According to some embodiments of the present disclosure, the cavity is cylindrical.

[0022] According to some embodiments of the present disclosure, the heating element is disk-shaped.

[0023] According to some embodiments of the present disclosure, a baffle is protrudingly arranged in the lower housing part, the baffle is positioned in the cavity, and an inner side surface of the baffle facing the impeller assembly is in an involute spiral shape.

[0024] According to some embodiments of the present disclosure, a distance from an outer side surface of the baffle away from the impeller assembly to an inner side wall of the cavity is inversely correlated with a distance from the baffle to the heating element.

[0025] According to some embodiments of the present disclosure, a coating is included on the inner side wall of the cavity.

[0026] According to some embodiments of the present disclosure, the impeller assembly includes a semi-open impeller.

[0027] According to a second aspect of the present disclosure, an embodiment provides a dish washing machine, including the heating pump according to the embodiments of the first aspect.

[0028] The dish washing machine according to this embodiment of the present disclosure has at least the following effects. In the heating pump of the dish washing machine, the heating element and at least a part of the housing are integrally formed, and the heating element is accommodated in an existing space of the housing, which can improve space utilization by reducing overall space occupation, and facilitate product miniaturization. In addition, assembly processes of installing the heating element in the housing are reduced, and the assembly efficiency can be improved. Because a size of the heating pump can be reduced, an installation space required for the heating pump in the dish washing machine is also reduced, thereby increasing an effective capacity of the dish washing machine.

BRIEF DESCRIPTION OF DRAWINGS

[0029] 

Fig. 1 is a schematic diagram of a first embodiment of a heating pump according to the present disclosure;

Fig. 2 is a schematic sectional view of the first embodiment of the heating pump according to the present disclosure;

Fig. 3 is a first schematic diagram of a lower housing part and an impeller assembly in the first embodiment of the heating pump according to the present disclosure;

Fig. 4 is a second schematic diagram of the lower housing part and the impeller assembly in the first embodiment of the heating pump according to the present disclosure;

Fig. 5 is a schematic diagram of a heating element in the first embodiment of the heating pump according to the present disclosure;

Fig. 6 is a schematic sectional view of a second embodiment of the heating pump according to the present disclosure;

Fig. 7 is a schematic diagram of a heating element in the second embodiment of the heating pump according to the present disclosure;

Fig. 8 is a schematic sectional view of a third embodiment of the heating pump according to the present disclosure; and

Fig. 9 is a schematic diagram of a heating element in the third embodiment of the heating pump according to the present disclosure.

Reference numerals:

[0030] 

housing 100; cavity 110; water inlet 120; water outlet 130; upper housing part 140; lower housing part 150; through hole 160; pipe 170;

heating element 200; working portion 210; wiring portion 220;

impeller assembly 300; motor 310; baseplate 320; blade 330;

baffle 400; inner side surface 410; outer side surface 420; and gap S.

DETAILED DESCRIPTION

[0031] Embodiments of the present disclosure will be described in detail hereinafter with reference to accompanying drawings in which the same or like reference numerals refer to the same or like elements or elements having the same or like functions. The embodiments described below with reference to the accompanying drawings are illustrative. The embodiments are only used for illustrating the present disclosure, and are not intended to be construed as limiting the present disclosure.

[0032] In the description of the present disclosure, it should be understood that for the description of orientations, the orientation or positional relationships indicated by the terms such as "upr", "down", and the like should be construed to refer to the orientation as then described or as shown in the drawings under discussion. These relative terms are merely for convenience of descriptions of the present disclosure and for simplifying descriptions, and do not indicate or imply that the referred device or component should have a specific orientation and be constructed or operated in a particular orientation. Therefore, such terms should not be construed as limiting the present disclosure.

[0033] In the description of the present disclosure, "a plurality of" means two or more. The terms such as "first", "second", and the like are merely used for distinguishing technical features, and are not intended to indicate or imply relative importance, or implicitly point out the number of the indicated technical features, or implicitly point out the precedence order of the indicated technical features.

[0034] In the description of the present disclosure, unless otherwise explicitly defined, the terms such as "arrange", "install/mount" and "connect" should be understood in a broad sense, and those having ordinary skills in the art can reasonably determine the specific meanings of the above terms in the present disclosure based on the specific contents of the technical scheme.

[0035] Heating pumps are usually used to heat and pump fluid. In a conventional heating pump, an installation position is generally preserved on a housing part for a heating component to be mounted. After the housing is manufactured, the heating component is installed on the housing. The two can be assembled after manufactured separately, which results in cumbersome installation processes. To install the heating component, an operating space is necessary. Such consideration is not conducive to design a minimized housing in the art. In addition, the housing and the heating component each occupy a space separately, such that a larger space is occupied when combined.

[0036] Figs. 1 to 5 show schematic diagrams according to a first embodiment of a heating pump. The heating pump includes a housing 100, a heating element 200, and an impeller assembly 300. The housing 100 is internally provided with a cavity 110. The cavity 110 has a water inlet 120 and a water outlet 130, and the water inlet 120 and the water outlet 130 are both communicated with the cavity 110, to allow flow in and out of fluid. The heating element 200 and the housing 100 are integrally die-cast to form an integrated structure. The die-cast means injecting molten metal under high pressure into a precision metal mold cavity at a high speed, such that the molten metal is cooled and solidified under pressure to form a casting. The impeller assembly 300 is rotatably installed in the housing 100, and is partially positioned in the cavity 110, to drive fluid in the cavity 110 to flow from the water inlet 120 to the water outlet 130. An output part of the impeller assembly 300 is positioned in the cavity 110. Those having ordinary skills in the art can understand that the heating element 200 may alternatively be integrally formed with the housing 100 in another manner. For example, the heating element 200 may be integrally formed with the housing 100 by squeeze casting. The squeeze casting is a method of solidifying liquid or semi-solid metal in flow-forming under high pressure to directly obtain a workpiece or a blank. The squeeze casting has advantages such as high utilization of liquid metal, simplified processes, and stable quality.

[0037] In the heating pump, the heating element 200 and the housing 100 are integrally formed. The heating element is accommodated in an existing space of the housing 100, which can reduce overall space occupation, improve space utilization, and facilitate product miniaturization design. In addition, assembly processes of installing the heating element 200 in the housing 100 are simplified, and the assembly efficiency can be improved.

[0038] It should be noted that the heating element 200 may be partially wrapped by a side wall of the housing 100, or entirely wrapped by the housing 100.

[0039] As shown in Fig. 2, the heating element 200 includes a working portion 210 for generating heat and a wiring portion 220 for power connection. The working portion 210 is entirely wrapped within the side wall of the housing 100. The wiring portion 220 is at least partially positioned outside the housing 100, to connect to a power cable. In this embodiment, the working portion 210 is entirely positioned within the side wall of the housing 100, and all the heat generated by the working portion 210 can be transferred to the housing 100, and then the fluid in the cavity 110 is heated by the housing 100, such that the fluid in the cavity 110 can be evenly heated. In addition, effective preservation of the lifespan of the working portion 210 is achieved by eliminating the need for direct contact with the fluid that requires heating..

[0040] Certainly, those having ordinary skills in the art can understand that the working portion 210 is not limited to the foregoing embodiment, and may alternatively be implemented as being partially wrapped by the side wall of the housing 100. For example, in some scenarios requiring quick fluid heating, at least one surface of the working portion 210 is exposed out of the side wall of the housing 100, and a remaining part is wrapped by the side wall of the housing 100. In this case, the working portion 210 can partially be in direct contact with the to-be-heated fluid for direct heat exchange, to quickly heat the fluid. In this embodiment, after started, the heating element 200 simultaneously heats liquid and an upper housing part 140. In an embodiment where the heating element 200 is entirely wrapped by the side wall of the upper housing part 140, after being started, the heating element 200 first heats the upper housing part 140, the liquid is then heated by the upper housing part 140, and all the heat generated by the heating element 200 needs to pass through the upper housing part 140 before transferred to the liquid. It can be seen from the above that compared with the embodiment in which the heating element 200 is entirely wrapped by the side wall of the upper housing part 140, this embodiment can reduce a response time from the start of work to the set temperature.

[0041] 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 a mold, metal is then injected into the mold, and the metal and the electric heating tube are integrally die-cast in the mold.

[0042] As shown in Fig. 1 and Fig. 2, in some embodiments of the present disclosure, the housing 100 includes the upper housing part 140 and a lower housing part 150. The upper housing part 140 and the lower housing part 150 are detachably connected to each other. The upper housing part 140 and the lower housing part 150 are separately manufactured and then assembled together. The upper housing part 140 and the lower housing part 150 may be connected through a threaded structure, a bolt, or a screw. The cavity 110 is arranged in the upper housing part 140. The water inlet 120 and the water outlet 130 are both arranged in the upper housing part 140. The impeller assembly 300 is installed in the lower housing part 150. A part of the impeller assembly 300 protrudes upward relative to the lower housing part 150, and is positioned in the cavity 110. The heating element 200 and the upper housing part 140 are integrally die-cast to form an integrated structure.

[0043] The housing 100 is divided into two parts, which can reduce processing difficulty, improve processing efficiency, and reduce processing costs, while allowing the upper housing part 140 and the lower housing part 150 to be made of a suitable material according to actual needs, thereby reducing overall costs. For example, because the upper housing part 140 needs to withstand high temperatures and quickly transfer heat, the upper housing part 140 may be made of metal to facilitate quick transfer of heat from the working portion 210 to fluid and avoid deformation due to an excessively high temperature of the working portion 210. The lower housing part 150 is configured to have the impeller assembly 300 installed therein and enclose the cavity 110, and thus does not need to withstand high temperatures. Therefore, the lower housing part 150 may be made of plastic. For example, the lower housing part 150 may be made of polyurethane plastic or epoxy plastic. The lower housing part 150 made of plastic is easy to process and has lower costs.

[0044] The upper housing part 140 may be made of aluminum. Aluminum die-casting can easily produce a complex shape, such that a structure of the upper housing part 140 can be integrally formed, and has satisfactory thermal conductivity. During manufacture, the heating element 200 is placed in a mold, and then integrally die-cast with aluminum. Certainly, the upper housing part 140 may alternatively be made of copper or other metal materials, to achieve quick heat conduction and high temperature resistance.

[0045] It should be noted that an installation implementation of the cavity 110 and the impeller assembly 300 is not limited to the foregoing embodiment. The cavity 110 and the impeller assembly 300 may be reversed in position, that is, the cavity 110 may be arranged in the lower housing part 150, the water inlet 120 and the water outlet 130 may be both arranged in the lower housing part 150, and the impeller assembly 300 may be installed in the upper housing part 140. The lower housing part 150 may be made of a metal material and integrally die-cast with the heating element 200, the upper housing part 140 may be made of a plastic material, to reduce processing difficulty and material costs. Such an implementation can achieve the same functions.

[0046] In addition, those having ordinary skills in the art can understand that the housing 100 is not limited to being manufactured in two parts. In some embodiments of the present disclosure, the housing 100 may alternatively be manufactured in one piece, to reduce assembly processes and improve overall structural strength.

[0047] As shown in Fig. 1, Fig. 2 and Fig. 5, in some embodiments of the present disclosure, the cavity 110 in the upper housing part 140 is generally barrel-shaped with a changing depth of the cavity 110 and an inwardly recessed bottom of the cavity 110. To be specific, a central part of a bottom surface of the cavity is flat, and a remaining part of the bottom surface of the cavity is conical. The impeller assembly 300 includes a centrifugal structure. The depth of the cavity 110 is gradually increased along a direction from a position at a maximum outer diameter of the impeller assembly 300 positioned in the cavity 110 toward a side wall of the cavity 110. In this embodiment, after liquid driven by the impeller assembly 300 leaves the impeller assembly 300, a cross section for the liquid to circulate is gradually increased, which can slow down a flow speed of the liquid, in order to obtain a stable liquid transition. This is more consistent with a fluid design principle of reducing turbulence and helping improve hydraulic efficiency.

[0048] A through hole 160 is arranged in the central part of the bottom surface of the cavity 110. The water inlet 120 is connected to the through hole 160 through a curved pipe to communicate with the cavity 110. The water inlet 120 and the water outlet 130 are arranged in parallel, which makes it convenient for operators to connect pipes at the same work station, relieves the operators from walking back and forth, and improves work efficiency.

[0049] To get access to the cavity 110, the heating element 200 is in a shape of an inverted triangular spiral. The heating element 200 is positioned in the conical part of the bottom surface of the cavity. The heating element 200 is a heating tube coiled with at least two turns, such that the upper housing part 140 can be evenly heated. It should be noted that the number of turns of the heating tube is set in correspondence to a diameter of the cavity 110. A larger cavity 110 indicates more turns of the heating tube, and a greater area of contact with the upper housing part 140, such that the heating is more even and efficient.

[0050] As shown in Fig. 6, in some embodiments of the present disclosure, the cavity 110 in the upper housing part 140 is generally barrel-shaped with a changing depth of the cavity 110 changes and an outwardly projected bottom of the cavity 110. To be specific, a central part of a bottom surface of the cavity 110 is flat, and a remaining part of the bottom surface of the cavity 110 is conical. The impeller assembly 300 includes a centrifugal structure. The depth of the cavity 110 is gradually decreased along a direction from a position at a maximum outer diameter of the impeller assembly 300 positioned in the cavity 110 toward a side wall of the cavity 110. For a fixed height of the cavity 110, this embodiment can increase a space inside the cavity 110, such that an effective accommodation space of the cavity 110 is increased.

[0051] A through hole 160 is arranged in the central part of the bottom surface of the cavity 110. The water inlet 120 is connected to the through hole 160 through a curved pipe 170 to communicate with the cavity 110. The water inlet 120 and the water outlet 130 are arranged in parallel, which makes it convenient for operators to connect pipes at the same work station, relieves the operators from walking back and forth, and improves work efficiency.

[0052] As shown in Fig. 7, to get access to the cavity 110, the heating element 200 is in a shape of a triangular spiral. The heating element 200 is positioned in the conical part of the bottom surface of the cavity 110. The heating element 200 is a heating tube coiled with at least two turns, such that the upper housing part 140 can be evenly heated. It should be noted that the number of turns of the heating tube is set in correspondence to a diameter of the cavity 110. A larger cavity 110 indicates more turns of the heating tube, and a greater area of contact with the upper housing part 140, such that the heating is more even and efficient.

[0053] As shown in Fig. 8, in some embodiments of the present disclosure, the cavity 110 in the upper housing part 140 is cylindrical, with a consistent depth. This embodiment is very practical and allows for a balance of flow performance of fluid and space utilization of the cavity 110.

[0054] For example, a through hole 160 is arranged at a central position of the bottom surface of the cavity 110. The water inlet 120 is connected to the through hole 160 through a curved pipe 170 to communicate with the cavity 110. The water inlet 120 and the water outlet 130 are arranged in parallel, which makes it convenient for operators to connect pipes at the same work station, relieves the operators from walking back and forth, and improves the work efficiency.

[0055] As shown in Fig. 9, to get access to the cavity 110, the heating element 200 is disk-shaped. The heating element 200 is positioned in the bottom surface of the cavity 110. The heating element 200 is a heating tube coiled with at least two turns, such that the upper housing part 140 can be evenly heated. It should be noted that the number of turns of the heating tube is set in correspondence to a diameter of the cavity 110. A larger cavity 110 indicates more turns of the heating tube, and a greater area of contact with the upper housing part 140, such that the heating is more even and efficient.

[0056] As shown in Figs. 2 to 4, in some embodiments of the present disclosure, a baffle 400 is protrudingly arranged in the lower housing part 150. After the upper housing part 140 and the lower housing part 150 are assembled, the baffle 400 is positioned in the cavity 110. An inner side surface 410 of the baffle 400 facing the impeller assembly 300 is in an involute spiral shape, to guide flow of the fluid driven by the impeller assembly, and reduce turbulence, which helps improve hydraulic efficiency.

[0057] The baffle 400 and the lower housing part 150 may be integrally formed, or may be separately manufactured and then assembled.

[0058] As shown in Figs. 2 to 4, because the baffle 400 is positioned in the cavity 110 and is close to the heating element 200, when the baffle 400 is made of a plastic material, temperature impact of the heating element 200 on the baffle 400 needs to be considered. To this end, in some embodiments of the present disclosure, a gap S is set between an outer side surface 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 member 200, the larger the gap S is, and the farther the baffle 400 is to 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, to prevent the baffle 400 from being overheated and deformed, thereby ensuring the service life of the baffle 400. When the baffle 400 is away from the heating element 200, a heat dissipation demand here is not high, so that there is no need for a large flow, and thus no need for a large gap.

[0059] In addition, to avoid turbulence when liquid enters and exits the gap S, both ends of the baffle 400 are provided with an inclined surface, and the inclined surface guides the liquid into the gap S, which can effectively reduce turbulence when the liquid enters and exits the gap S, and improve overall hydraulic efficiency. A top of the baffle 400 uses a curved surface for smooth transition, to reduce turbulence when liquid flows by, which can further improve the overall hydraulic efficiency.

[0060] In some usage scenarios, fluid flowing through the cavity 110 is corrosive. To ensure the service life of the housing 100, a coating is provided on the inner side wall of the cavity 110 to prevent direct contact of the fluid with the housing 100. When the upper housing part 140 is made of a metal material, a coating needs to be arranged on the inner side wall of the cavity 110 of the upper housing part 140. The coating may be made of a polytetrafluoroethylene material (Teflon). Polytetrafluoroethylene is acid-resistant and alkali-resistant, is resistant to various organic solvents, and can effectively protect the upper housing part 140 from being corroded by fluid.

[0061] Those having ordinary skills in the art can understand that a specific implementation of the coating is not limited to the polytetrafluoroethylene material, and other embodiments may alternatively be used. For example, the coating may alternatively use an epoxy resin material.

[0062] As shown in Fig. 2, Fig. 6 and Fig. 8, in some embodiments of the present disclosure, the impeller assembly 300 includes a semi-open impeller and a motor 310. The semi-open impeller is positioned in the cavity 110, and the motor 310 is installed in the lower housing part 150. The semi-open impeller includes a baseplate 320 and a plurality of blades 330. A threaded hole is arranged at a lower side of the baseplate 320, and the threaded hole is threadedly connected to a rotating shaft of the motor 310. The blades 330 are installed at an upper side of the baseplate 320, and the plurality of blades 330 are distributed circumferentially. 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 the pipe 170 with a 90° angle, and a center line of the water outlet 130 is perpendicular to the rotating shaft of the motor. Water entering from the inlet 120 is guided through the pipe 170 and turns, then flows between the blades 330 along a direction of the rotating shaft of the motor, and is blocked by the baseplate 320. Then, the water is driven by the rotating blades 330 to rotate, moves outward under the effect of centrifugal force, and is guided by the baffle 400 to be discharged thorough the water outlet 130. Such an arrangement can quickly drive fluid entering from the water inlet 120 to the water outlet 130 to a great extent, thereby improving the overall hydraulic efficiency.

[0063] A working principle of the heating pump is as follows. After the heating pump is started, liquid enters from the inlet 120 and flows through the pipe 170. Under the guidance of the pipe 170, a liquid flow direction changes to the same direction as the rotating shaft of the motor 310, and the liquid enters the cavity 110 from the through hole 160. The heating element 200 heats the water in the cavity 110. As driven by the blades 330, the heated water leaves the blades 330 in a centrifugal manner, and is guided by the baffle 400 to be discharged thorough the water outlet 130.

[0064] The present disclosure further provides a dish washing machine, including the heating pump according to any one of the foregoing embodiments. In the heating pump of the dish washing machine, the heating element 200 and the housing 100 are integrally die-cast. The heating element is accommodated in an existing space of the housing 100, which can reduce overall space occupation, improve space utilization, and facilitate product miniaturization. In addition, assembly processes of installing the heating element 200 in the housing 100 are simplified, and assembly efficiency can be improved. Because a size of the heating pump can be reduced, an installation space required for the heating pump in the dish washing machine is also reduced, thereby increasing an effective capacity of the dish washing machine.

[0065] The embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the above embodiments, and various changes may be made within the knowledge of those having ordinary skills in the art without departing from the scope of the present disclosure.

Claims

1. A heating pump, comprising:

a housing internally provided with a cavity, the cavity having a water inlet and a water outlet;

a heating element integrally formed with at least a part of the housing; and

an impeller assembly rotatably installed in the housing and partially positioned in the cavity.

2. The heating pump of claim 1, wherein the heating element is integrally formed with the at least a part of the housing by a way of die casting or squeeze casting.

3. The heating pump of claim 1, wherein the heating element comprises a working portion for generating heat and a wiring portion for power connection, the working portion is at least partially wrapped within a side wall of the housing, and the wiring portion is at least partially positioned outside the housing.

4. The heating pump of claim 3, wherein the working portion is entirely wrapped within the side wall of the housing.

5. The heating pump of claim 1, wherein the housing comprises an upper housing part and a lower housing part which are detachably connected to each other, the cavity is arranged in the upper housing part, the impeller assembly is installed in the lower housing part, and the heating element and the upper housing part are integrally formed.

6. The heating pump of claim 5, wherein the upper housing part is made of metal.

7. The heating pump of claim 5, wherein the lower housing part is made of plastic.

8. The heating pump of claim 5, wherein a depth of the cavity is gradually increased along a direction from a position at a maximum outer diameter of the impeller assembly toward a side wall of the cavity.

9. The heating pump of claim 8, wherein the cavity is barrel-shaped, a bottom of the cavity is recessed inwardly, and a central part of a bottom surface of the cavity is flat.

10. The heating pump of claim 9, wherein the heating element is in a shape of an inverted triangular spiral.

11. The heating pump of claim 5, wherein a depth of the cavity is gradually decreased along a direction from a position at a maximum outer diameter of the impeller assembly toward a side wall of the cavity.

12. The heating pump of claim 11, wherein the cavity is barrel-shaped, a bottom of the cavity projects outwardly, and a central part of a bottom surface of the cavity is flat.

13. The heating pump of claim 12, wherein the heating element is in a shape of a triangular spiral.

14. The heating pump of claim 5, wherein a depth of the cavity is consistent along a direction from a position at a maximum outer diameter of the impeller assembly toward a side wall of the cavity.

15. The heating pump of claim 14, wherein the cavity is cylindrical.

16. The heating pump of claim 15, wherein the heating element is disk-shaped.

17. The heating pump of claim 5, wherein a baffle is protrudingly arranged in the lower housing part, the baffle is positioned in the cavity, and an inner side surface of the baffle facing the impeller assembly is in an involute spiral shape.

18. The heating pump of claim 17, wherein a distance from an outer side surface of the baffle away from the impeller assembly to an inner side wall of the cavity is inversely correlated with a distance from the baffle to the heating element.

19. The heating pump of claim 1, wherein a coating is coated on an inner side wall of the cavity.

20. The heat pump of claim 1, wherein the impeller assembly comprises a semi-open impeller.

21. A dish washing machine, comprising a heating pump of any one of claims 1 to 20.

Drawing