Heating pump and dish washing machine

Abstract

The utility model discloses a heating pump and dish-washing machine relates to kitchen heating electric appliance technical field, the heating pump includes pump casing, impeller, cover plate and motor, pump casing has impeller chamber, pump casing upper end is provided with the liquid inlet that is communicated with impeller chamber, pump casing side is provided with the liquid outlet that is communicated with impeller chamber, pump casing lower end is provided with the mounting hole that is communicated with impeller chamber; the impeller is rotationally arranged in the impeller cavity; the cover plate covers the mounting hole from the upper end of the mounting hole, the peripheral area of the cover plate is supported at the upper end edge of the mounting hole, and the cover plate is provided with a via hole; the motor is arranged at the lower end of the pump shell, and an output shaft of the motor is connected with the impeller through a via hole. A limiting structure for at least upwards limiting the cover plate is arranged in the impeller cavity; the cover plate directly covers the mounting hole, the cover plate is limited through the limiting structure arranged in the impeller cavity, and the cover plate does not need to be clamped and fixed by arranging two shells, so that the possibility of leakage between the two shells is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen and thermal appliances, and particularly relates to a heating pump and a dishwasher. Background Art

[0002] With the rapid development of technology, automated household appliances have more functions to better serve people's lives. For example, an automatic dishwasher can drive water flow through a pump body while heating the water flow in the pump body, so as to more conveniently wash tableware and provide convenience for people's lives.

[0003] When the dishwasher is running, the motor works to drive the impeller to stir the water flow, and the heater heats accordingly. However, after a long time, water leakage often occurs at the connection of the pump shell. Summary of the Utility Model

[0004] The main object of the utility model is to propose a heating pump and a dishwasher, aiming to solve the problem that the existing heating pump is prone to water leakage.

[0005] To achieve the above object, the heating pump proposed by the utility model includes:

[0006] A pump shell having an impeller cavity. An inlet is provided at the upper end of the pump shell and communicates with the impeller cavity. An outlet is provided at the side of the pump shell and communicates with the impeller cavity. An installation hole is provided at the lower end of the pump shell and communicates with the impeller cavity.

[0007] An impeller rotatably arranged in the impeller cavity;

[0008] A cover plate which covers the installation hole from the upper end of the installation hole, and the peripheral area of the cover plate is supported at the upper edge of the installation hole. The cover plate is provided with a through hole; and

[0009] A motor arranged at the lower end of the pump shell, and the output shaft of the motor is connected to the impeller through the through hole;

[0010] Wherein, at least a limiting structure for upwardly limiting the cover plate is arranged in the impeller cavity.

[0011] In an embodiment, the heating pump includes an expansion sleeve. The expansion sleeve is located outside the impeller, and a communication port is provided at the side of the expansion sleeve;

[0012] The upper end of the expansion sleeve extends to the inlet, and the lower end of the expansion sleeve extends to abut against the cover plate;

[0013] The limiting structure includes the expansion sleeve.

[0014] In an embodiment, the expansion sleeve includes:

[0015] The upper section is arranged at the liquid inlet;

[0016] The lower section abuts against the cover plate, and the lower section laterally extends beyond the upper section; and,

[0017] The connecting section connects between the upper section and the lower section and is arranged to gradually expand outward from top to bottom.

[0018] In one embodiment, the motor includes a rotor, and the rotor is installed in the installation hole.

[0019] In one embodiment, one of the outer side of the cover plate and the inner side wall of the installation hole is provided with a limiting protrusion, and the other is provided with a limiting groove;

[0020] The limiting structure includes the limiting protrusion and the limiting groove.

[0021] In one embodiment, the installation hole includes:

[0022] The upper hole section;

[0023] The lower hole section, the upper end of the lower hole section is inwardly converged relative to the upper hole section to form an upward annular step surface between the upper hole section and the lower hole section;

[0024] The cover plate includes:

[0025] The cover plate main body is supported on the upper edge of the upper hole section;

[0026] The annular side portion is arranged on the lower side of the cover plate main body and cooperates with the upper hole section;

[0027] One of the outer side of the annular side portion and the upper hole section is provided with a limiting protrusion, and the other is provided with the limiting groove.

[0028] In one embodiment, the pump housing includes:

[0029] The housing, an opening is provided at the upper end of the housing, and the liquid outlet and the installation hole are provided on the housing; and,

[0030] The cover body covers the opening and encloses the impeller cavity with the housing, and the liquid inlet is provided on the cover body.

[0031] In one embodiment, the heat pump further includes a water inlet assembly, and the water inlet assembly includes:

[0032] The expansion sleeve is located outside the impeller, and a communication port is provided on the side of the expansion sleeve. The upper end of the expansion sleeve extends to the liquid inlet, and the lower end of the expansion sleeve extends to abut against the cover plate; and,

[0033] The water inlet pipe has its lower end disposed at the liquid inlet and is clamped between the expansion sleeve and the cover body.

[0034] In one embodiment, the housing is integrally formed.

[0035] The present utility model further provides a dishwasher, which includes a heating pump, and the heating pump includes:

[0036] A pump housing having an impeller chamber. The upper end of the pump housing is provided with a liquid inlet communicating with the impeller chamber, the side portion of the pump housing is provided with a liquid outlet communicating with the impeller chamber, and the lower end of the pump housing is provided with a mounting hole communicating with the impeller chamber;

[0037] An impeller rotatably disposed in the impeller chamber;

[0038] A cover plate that covers the mounting hole from the upper end of the mounting hole, and the peripheral area of the cover plate is supported at the upper edge of the mounting hole. The cover plate is provided with a through hole; and,

[0039] A motor disposed at the lower end of the pump housing, and the output shaft of the motor is connected to the impeller through the through hole;

[0040] Wherein, at least a limiting structure for upwardly limiting the cover plate is disposed in the impeller chamber.

[0041] In the technical solution of the present utility model, the heating pump includes a motor disposed at the lower end of the pump housing. The motor drives the impeller to rotate, and discharges the liquid entering the impeller chamber from the liquid inlet from the liquid outlet. When the output shaft of the motor extends into the impeller chamber and is connected to the impeller, it passes through the through hole on the cover plate. When the heating pump is working, the cover plate is stably limited to the upper end of the mounting hole through the limiting structure, preventing the cover plate from being driven by the liquid in the impeller chamber to move, providing a stable radial support for the output shaft of the motor. By directly covering the cover plate on the mounting hole and limiting the cover plate through the limiting structure disposed in the impeller chamber, it is not necessary to clamp and fix the cover plate by setting two housings, thereby avoiding the possibility of leakage between the two housings. Description of the Drawings

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0043] Figure 1Schematic cross-sectional view of an embodiment of the heat pump provided by the present utility model;

[0044] Figure 2 For Figure 1 Schematic cross-sectional view of a partial structure of the heat pump in;

[0045] Figure 3 For Figure 2 Partial enlarged view at position A in;

[0046] Figure 4 For Figure 1 Schematic cross-sectional view of the housing in.

[0047] Explanation of the reference numerals in the drawings:

[0048] 100, heat pump; 1, pump housing; a, impeller chamber; b, liquid inlet; c, liquid outlet; d, mounting hole; d1, upper hole section; d2, lower hole section; 11, housing; 12, cover body; 2, impeller; 3, cover plate; e, through hole; 31, cover plate main body; 32, annular side part; 4, motor; 41, rotor; 5, expansion sleeve; 51, upper section; 52, lower section; 53, connecting section; 61, limiting protrusion; 62, limiting groove; 7, water inlet pipe.

[0049] The realization, functional features and advantages of the object of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0051] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0052] In addition, if the embodiments of the present utility model involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0053] With the rapid development of technology, automated household appliances have more functions to better serve people's lives. For example, an automatic dishwasher can heat the water flow in the pump body while driving the water flow through the pump body, so as to wash tableware more conveniently and provide convenience for people's lives. When the dishwasher is running, the motor works to drive the impeller to stir the water flow, and the heater heats accordingly. However, after a long time, water leakage often occurs at the connection of the pump shell.

[0054] In the related art, in order to provide stable support for the output shaft of the motor, the provided cover plate is fixed by a clamping method. To simplify the structure, the pump shell is divided into two parts. One half shell is mainly used for installing the motor, and the other half shell is used for placing the impeller. The two half shells are buckled to enclose and form an impeller cavity. To ensure the sealing performance between the two half shells, a gasket is also provided between the two half shells. However, sealing materials such as sealing rings or gaskets will gradually age over time, lose elasticity or deform, resulting in a decline in sealing performance. And the change in temperature will affect the expansion coefficient of the material, resulting in a change in the fitting gap between the half shells. Especially during the process of thermal expansion and contraction, the original sealing effect may be affected. And when starting and shutting down, the sudden change in pressure may cause additional pressure on the seal. All of the above factors will lead to leakage.

[0055] The present utility model proposes a heating pump to solve the problem that the existing heating pump is prone to water leakage. Figure 1 It is a schematic cross-sectional view of an embodiment of the heating pump provided by the present utility model; Figure 2 For Figure 1 A schematic cross-sectional view of a partial structure of the heating pump in Figure 3 For Figure 2 A partial enlarged view of part A in Figure 4 For Figure 1 A schematic cross-sectional view of the housing in

[0056] Please refer to Figures 1 to 2 Figures 1 to 2 , in an embodiment of the present utility model, the heat pump 100 includes a pump housing 1, an impeller 2, a cover plate 3 and a motor 4. The pump housing 1 has an impeller chamber a. An inlet port b communicating with the impeller chamber a is provided at the upper end of the pump housing 1. An outlet port c communicating with the impeller chamber a is provided at the side of the pump housing 1. A mounting hole d communicating with the impeller chamber a is provided at the lower end of the pump housing 1. The impeller 2 is rotatably arranged in the impeller chamber a. The cover plate 3 is arranged to cover the mounting hole d from the upper end of the mounting hole d, and the peripheral area of the cover plate 3 is supported at the upper edge of the mounting hole d. The cover plate 3 is provided with a through hole e. The motor 4 is arranged at the lower end of the pump housing 1, and the output shaft of the motor 4 is connected to the impeller 2 through the through hole e. Wherein, at least a limiting structure for limiting the cover plate 3 upward is arranged in the impeller chamber a.

[0057] It should be noted that the pump housing 1 is the main part of the heat pump 100, and a space for accommodating the impeller 2, i.e., the impeller chamber a, is formed inside the pump housing 1. The inlet port b is an opening provided at the upper end of the pump housing 1 for introducing the liquid to be pumped. The outlet port c is an opening provided at the side of the pump housing 1 for discharging the liquid pressurized by the impeller 2. The mounting hole d is an opening provided at the lower end of the pump housing 1 for mounting the cover plate 3 and connecting the motor 4.

[0058] The motor 4 provides power, and its output shaft is connected to the impeller 2 to drive the impeller 2 to rotate. The impeller 2 is the core component of the pump for driving the fluid flow.

[0059] The through hole e provided on the cover plate 3 is for the output shaft of the motor 4 to pass through and be connected to the impeller 2. The cover plate 3 is located at the lower end of the pump housing 1 and is supported at the upper edge of the mounting hole d. The upper edge of the mounting hole d is used to limit the cover plate 3 downward to ensure that the cover plate 3 will not move downward during operation.

[0060] The limiting structure is a structure arranged in the impeller chamber a for limiting the cover plate 3 upward to prevent the cover plate 3 from moving upward due to vibration or other reasons, thereby affecting the sealing performance and performance of the pump. The limiting structure can be an annular boss structure arranged on the inner wall of the impeller chamber a and located above the cover plate 3, or a buckle structure can be arranged between the cover plate 3 and the pump housing 1, or a screwing structure can be arranged between the cover plate 3 and the pump housing 1. Of course, the limiting structure is not limited to the above examples. Those skilled in the art may make other changes under the inspiration of the technical essence of the embodiments of this specification, but as long as the functions and effects achieved are the same or similar to those of the embodiments of this specification, they should all be covered within the protection scope of the embodiments of this specification.

[0061] In the technical solution of the present utility model, the heat pump 100 includes a motor 4 disposed at the lower end of the pump housing 1. The motor 4 drives the impeller 2 to rotate, and discharges the liquid entering the impeller chamber a from the liquid inlet b from the liquid outlet c. When the output shaft of the motor 4 extends into the impeller chamber a and is connected to the impeller 2, it passes through the through hole e in the cover plate 3. When the heat pump 100 is working, the cover plate 3 is stably positioned at the upper end of the mounting hole d through the limiting structure, preventing the cover plate 3 from being driven by the liquid in the impeller chamber a to move, so as to provide a stable radial support for the output shaft of the motor 4. By directly covering the cover plate 3 on the mounting hole d and limiting the cover plate 3 through the limiting structure disposed in the impeller chamber a, there is no need to clamp and fix the cover plate 3 by providing two housing bodies 11, thereby avoiding the possibility of leakage between the two housing bodies 11.

[0062] In this embodiment, the heat pump 100 includes an expansion sleeve 5. The expansion sleeve 5 is located outside the impeller 2, and a communication port is provided on the side of the expansion sleeve 5; the upper end of the expansion sleeve 5 extends to the liquid inlet b, and the lower end of the expansion sleeve 5 extends to abut against the cover plate 3; the limiting structure includes the expansion sleeve 5.

[0063] The expansion sleeve 5 is located outside the impeller 2, that is, around the outside of the impeller 2. A communication port is provided on the side of the expansion sleeve 5 for the flow of liquid. The upper end of the expansion sleeve 5 extends to the liquid inlet b of the pump housing 1, so that it can be ensured that the liquid directly flows into the inside of the expansion sleeve 5 after entering from the liquid inlet b. When the impeller 2 rotates, the liquid located inside the expansion sleeve 5 can be conveyed to the liquid outlet c through the communication port.

[0064] It should be noted that in the related art, since the liquid inlet is communicated with the water inlet pipe, in order to fix the water inlet pipe to the pump housing, an expansion sleeve is generally sleeved inside the water inlet pipe, so that the water inlet pipe is clamped between the peripheral edge of the liquid inlet of the pump housing and the expansion sleeve.

[0065] In this embodiment, by extending the lower end of the expansion sleeve 5 until it abuts against the cover plate 3, the lower end of the expansion sleeve 5 contacts the cover plate 3, and the cover plate 3 can be pressed against the upper end edge of the mounting hole d. So that the expansion sleeve 5 not only has the function of fixing the water inlet pipe 7, but also plays a role in limiting the upward movement of the cover plate 3.

[0066] In this embodiment, the expansion sleeve 5 includes an upper section 51, a lower section 52, and a connecting section 53. The upper section 51 is disposed at the liquid inlet b; the lower end abuts against the cover plate 3, and the lower section 52 extends laterally beyond the upper end; the connecting section 53 connects between the upper section 51 and the lower section 52 and is gradually expanded from top to bottom.

[0067] It should be noted that the upper section 51 is located at the upper part of the expansion sleeve 5 and is disposed at the liquid inlet b of the pump housing 1. The lower section 52 is located at the lower part of the expansion sleeve 5 and abuts against the cover plate 3. The connecting section 53 is the part connecting the upper section 51 and the lower section 52 and has a shape that is gradually expanded from top to bottom. The upper section 51 is disposed at the liquid inlet b. After the liquid enters from the liquid inlet b, it will directly enter the interior of the expansion sleeve 5. The upper section 51 can serve as the first channel for the liquid to enter the impeller cavity a, which helps to control the inflow of the liquid. The lower section 52 abuts against the cover plate 3 and functions to hold and limit the upward movement of the cover plate 3. The lower section 52 extending laterally beyond the upper section 51 means that the lower section 52 is larger than the upper section 51 in the diameter direction.

[0068] By setting the diameter of the lower section 52 of the expansion sleeve 5 to be larger, there is a larger abutting surface with the cover plate 3, which can better hold the cover plate 3 and helps to improve the stability of the expansion sleeve 5. And to a certain extent, it improves the structural strength of the expansion sleeve 5.

[0069] Specifically, in this embodiment, the motor 4 includes a rotor 41, and the rotor 41 is installed in the mounting hole d.

[0070] It should be noted that the motor 4 is set as a brushless motor 4. The rotor 41 of the motor 4 is installed in the mounting hole d, and after the stator of the motor 4 is plastic-sealed, it is fixed to the periphery of the lower end of the pump housing 1 by means of snap-fastening or screw connection. After the stator is energized, it interacts with the rotor 41, and the rotor 41 drives the output shaft to rotate.

[0071] The diameter of the rotor 41 is set to be smaller than the diameter of the impeller 2. Then a stepped portion is formed at the connection between the impeller cavity a and the mounting hole d. By supporting the cover plate 3 at the upper edge of the mounting hole d for installing the rotor 41, the installation structure is simplified.

[0072] Further, please refer to Figures 2 to 4 , in this embodiment, one of the outer side of the cover plate 3 and the inner side wall of the mounting hole d is provided with a limiting protrusion 61, and the other is provided with a limiting groove 62; the limiting structure includes the limiting protrusion 61 and the limiting groove 62.

[0073] It is understandable that the limiting protrusion 61 is provided on one of the outer side of the cover plate 3 or the inner side wall of the mounting hole d. The limiting groove 62 is provided on the side opposite to the limiting protrusion 61, that is, if the limiting protrusion 61 is provided on the outer side of the cover plate 3, the limiting groove 62 is provided on the inner side wall of the mounting hole d; vice versa.

[0074] When the cover plate 3 is installed into the mounting hole d of the pump housing 1, the limiting protrusion 61 will align with and be embedded in the limiting groove 62, ensuring the correct position and stability of the cover plate 3. Since the limiting groove 62 stops the upward movement of the limiting protrusion 61, it further assists in limiting the upward movement of the cover plate 3.

[0075] In this embodiment, the mounting hole d includes an upper hole section d1 and a lower hole section d2. The upper end of the lower hole section d2 is inwardly tapered relative to the upper hole section d1 to form an upward annular step surface between the upper hole section d1 and the lower hole section d2; the cover plate 3 includes a cover plate main body 31 and an annular side portion 32. The cover plate main body 31 is supported on the upper edge of the upper hole section d1; the annular side portion 32 is provided on the lower side of the cover plate main body 31 and cooperates with the upper hole section d1; one of the outer side of the annular side portion 32 and the upper hole section d1 is provided with the limiting protrusion 61, and the other is provided with the limiting groove 62.

[0076] The through hole e is provided on the cover plate main body 31 and is located at the bottom of the impeller chamber a. The annular side portion 32 is an annular structure below the cover plate main body 31 and is used to cooperate with the mounting hole d. The cover plate main body 31 is supported on the upper edge of the upper hole section d1. The annular side portion 32 cooperates with the upper hole section d1.

[0077] When the cover plate 3 is installed into the mounting hole d of the pump housing 1, the cover plate main body 31 is supported on the upper edge of the upper hole section d1, and the annular side portion 32 cooperates with the upper hole section d1. The limiting protrusion 61 will align with and be embedded in the limiting groove 62, ensuring the correct position and stability of the cover plate 3.

[0078] In this way, by providing the limiting protrusion 61 or the limiting groove 62 on the annular side portion 32, the annular side portion 32 provides a layout position for the limiting protrusion 61 or the limiting groove 62, and the limiting protrusion 61 or the limiting groove 62 is not limited by the thickness of the cover plate main body 31.

[0079] It can be understood that the limiting groove 62 is arranged as an annular groove. When the annular groove extends along the circumferential direction of the lower hole section d2, a plurality of limiting protrusions 61 can be arranged. The plurality of limiting protrusions 61 are arranged at intervals along the circumferential direction of the annular side portion 32. The plurality of limiting protrusions cooperate with the annular groove. While facilitating assembly, the plurality of limiting protrusions can cooperate more stably, and at the same time, materials can be saved.

[0080] Further, in this embodiment, the pump housing 1 includes a housing 11 and a cover 12. An opening is provided at the upper end of the housing 11, and the liquid outlet c and the mounting hole d are provided on the housing 11; the cover 12 is covered on the opening, and the cover 12 and the housing 11 enclose to form the impeller chamber a, and the liquid inlet b is provided on the cover 12.

[0081] Since the rotor 41 of the motor 4 is arranged in the mounting hole d in the pump housing 1, then during assembly, in order to facilitate the installation of the rotor 41, the rotor 41 can be placed in the mounting hole d from the opening, and then the cover 12 in the water inlet assembly is covered on the opening on the housing 11 to enclose and form the impeller chamber a.

[0082] The cover 12 and the housing 11 can be fixed by a snap structure or a screwed structure. In order to avoid leakage between the cover 12 and the housing 11, a gasket is arranged between the cover 12 and the housing 11 for sealing.

[0083] In this embodiment, the heating pump 100 further includes a water inlet assembly. The water inlet assembly includes an expansion sleeve 5 and a water inlet pipe 7. The expansion sleeve 5 is located outside the impeller 2, and a communication port is provided on the side portion of the expansion sleeve 5. The upper end of the expansion sleeve 5 extends to the liquid inlet b, and the lower end of the expansion sleeve 5 extends to abut against the cover plate 3; the lower end of the water inlet pipe 7 is arranged at the liquid inlet b and is clamped between the expansion sleeve 5 and the cover 12.

[0084] In the related art, when assembling the heating pump, a gasket is arranged between the cover and the half housing, the cover in the water inlet assembly is covered on the half housing, the cover and the half housing are buckled, then the rotor is installed in the other half housing, and then another sealing ring and the cover plate are arranged between the two half housings, and the two half housings are assembled through an assembly structure, and the cover plate is clamped between the two half housings, and at the same time, this place is sealed through the sealing ring.

[0085] In the solution of this embodiment, when the cover body 12 is assembled with the housing 11, when the cover body 12 and the housing 11 are installed in place, the lower end of the expansion sleeve 5 can just abut against the cover plate 3, and the assembly is more convenient. There is no need to additionally provide a sealing ring, reducing the assembly cost.

[0086] In this embodiment, the housing 11 is integrally formed. Integrally formed means that the housing 11 is an integral structure made of a single material and is formed at one time through processes such as casting, injection molding, and stamping, rather than being assembled from multiple separate components. Such a setting can reduce the assembly steps in the production process, reduce the production cost. At the same time, the seams inside the housing 11 are reduced, which helps to improve the sealing performance of the housing 11 and reduce leakage.

[0087] The present utility model also proposes a dishwasher, which includes a sink and a heating pump 100. The specific structure of the heating pump 100 refers to the above embodiment. Since this dishwasher adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated here one by one.

[0088] The above are only exemplary embodiments of the present utility model, and do not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. A heating pump, characterized in that: include: A pump housing having an impeller cavity, wherein the upper end of the pump housing is provided with a liquid inlet connected to the impeller cavity, the side of the pump housing is provided with a liquid outlet connected to the impeller cavity, and the lower end of the pump housing is provided with a mounting hole connected to the impeller cavity; An impeller rotatably disposed in the impeller chamber; a cover plate, the cover plate being arranged to cover the mounting hole from the upper end of the mounting hole, and the peripheral area of ​​the cover plate being supported at the upper edge of the mounting hole, and the cover plate being provided with a through hole; and A motor is arranged at the lower end of the pump housing, and an output shaft of the motor is connected to the impeller through the through hole; Wherein, a limiting structure for at least limiting the cover plate upward is provided in the impeller chamber.

2. The heat pump according to claim 1, characterized in that The heating pump comprises an expansion sleeve, the expansion sleeve is located at the periphery of the impeller, and a communication port is provided on the side of the expansion sleeve; The upper end of the expansion sleeve extends to the liquid inlet, and the lower end of the expansion sleeve extends to abut against the cover plate; The limiting structure includes the expansion sleeve.

3. The heating pump according to claim 2, characterized in that The expansion sleeve comprises: An upper section, arranged at the liquid inlet; a lower section, disposed against the cover plate and laterally extending beyond the upper section; and The connecting section connects the upper section and the lower section and is gradually expanded from top to bottom.

4. The heat pump according to claim 1, characterized in that The motor includes a rotor, and the rotor is mounted in the mounting hole.

5. The heat pump according to claim 4, characterized in that One of the outer side of the cover plate and the inner side wall of the mounting hole is provided with a limiting protrusion, and the other is provided with a limiting groove; The limiting structure includes the limiting protrusion and the limiting groove.

6. The heat pump according to claim 5, characterized in that The mounting hole comprises: Upper hole section; A lower hole section, wherein the upper end of the lower hole section is arranged inwardly relative to the upper hole section, so as to form an upward annular step surface between the upper hole section and the lower hole section; The cover plate comprises: A cover plate body supported on the upper edge of the upper hole section; An annular side portion, disposed on the lower side of the cover plate body and matched with the upper hole section; One of the outer side of the annular side portion and the upper hole section is provided with a limiting protrusion, and the other is provided with the limiting groove.

7. The heat pump according to claim 1, characterized in that The pump housing comprises: a housing, wherein an opening is provided at the upper end of the housing, and the liquid outlet and the mounting hole are provided on the housing; and, A cover body is arranged on the opening and is enclosed with the shell to form the impeller chamber. The cover body is provided with the liquid inlet.

8. The heating pump according to claim 7, characterized in that The heating pump further comprises a water inlet assembly, wherein the water inlet assembly comprises: An expansion sleeve, the expansion sleeve is located at the periphery of the impeller, and a communication port is provided on the side of the expansion sleeve, the upper end of the expansion sleeve extends to the liquid inlet, and the lower end of the expansion sleeve extends to abut against the cover plate; and, A water inlet pipe, the lower end of which is arranged at the liquid inlet and clamped between the expansion sleeve and the cover body.

9. The heat pump according to claim 7, characterized in that: The shell is integrally formed.

10. A dishwasher, characterized in that: Comprising a heating pump as claimed in any one of claims 1 to 9.

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