CN110080988B

CN110080988B - Heating pump and dish washing machine

Info

Publication number: CN110080988B
Application number: CN201910418136.7A
Authority: CN
Inventors: 刘日超
Original assignee: Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Current assignee: Wuhu Midea Smart Kitchen Appliance Manufacturing Co Ltd
Priority date: 2019-05-20
Filing date: 2019-05-20
Publication date: 2021-09-21
Anticipated expiration: 2039-05-20
Also published as: CN110080988A

Abstract

The invention discloses a heating pump and a dishwasher, wherein the water pump comprises: the first pump shell is provided with a first inlet and a first outlet, the impeller is rotatably arranged in the first pump shell and is suitable for driving fluid to flow to the first outlet from the first inlet, the axis of the impeller extends along the vertical direction, the heating pipe is covered on the outer side of the first pump shell, the first outlet of the first pump shell is communicated with the inner space of the heating pipe, the second pump shell is communicated with the inner space of the heating pipe, and the flow guide structure is arranged in the heating pipe and is constructed to guide flow from the first pump shell to the second pump shell. In the invention, by arranging the first pump shell and the flow guide structure, water flow in each impeller channel is gathered and then discharged from one or more outlets, so that the flowing state of the water flow in the heating cavity is stable and regular, and the integral hydraulic efficiency of the dish washing machine is improved.

Description

Heating pump and dish washing machine

Technical Field

The invention relates to the technical field of integrated heating pumps, in particular to a heating pump and a dish washing machine with the same.

Background

The washing pump in existing dishwashers usually integrates a heating function into the washing pump in order to save space, but as a result, the original flow channel structure is often destroyed, thereby causing additional hydraulic losses. Particularly, the integrated washing pump after heating among the current dish washer is the heating mode of the heating pipe that adopts usually, because the existence of washing pump heating pipe, has increaseed the size of pump chamber to seriously influence the hydraulic efficiency of monoblock pump, simultaneously because heating pipe heat exchange area is limited, it is very difficult to increase heating power in limited space. In addition, the washing pump integrated with the heated washing machine in the existing dish washing machine has a structure that a cylindrical thick film heater is used as a pump cavity, but the water flow loss in the pump cavity is serious.

Disclosure of Invention

The invention aims to solve the problems that in the prior art, a heating pipe is integrated in a washing pump to damage a flow channel structure to generate hydraulic loss and a traditional thick film heater is directly used as a pump cavity structure to cause hydraulic loss in the pump cavity, and provides a heating pump which is realized by adopting the thick film heater as a liquid circulation pipeline in a limited space under the condition of not sacrificing hydraulic efficiency and arranging a first pump shell structure outside an impeller to gather water flow in each impeller channel and discharge the water flow from one or more outlets to ensure that the flow state of the water flow in the heating cavity is stable and regular, thereby improving the overall hydraulic efficiency.

According to the embodiment of the invention, the water pump comprises: the device comprises a first pump shell, an impeller, a heating pipe, a second pump shell and a flow guide structure, wherein the first pump shell is provided with a first inlet and a first outlet; the impeller is rotatably arranged in the first pump shell, the impeller is suitable for driving fluid to flow from the first inlet to the first outlet, and the axis of the impeller extends along the vertical direction; the heating pipe cover is arranged on the outer side of the first pump shell, and a first outlet of the first pump shell is communicated with the inner space of the heating pipe; the second pump shell is communicated with the inner space of the heating pipe; the flow directing structure is disposed within the heating tube and is configured to direct flow from the first pump housing to the second pump housing.

According to the water pump provided by the embodiment of the invention, the flow guide structure and the first pump shell are additionally arranged, so that the water flow in the pump cavity is more smooth and regular, and the effect of heating can be realized without influencing the hydraulic efficiency in the limited pump cavity space. In other words, the space of the pump cavity is saved, the hydraulic efficiency is improved, and the heating function is realized.

In addition, according to the above embodiment of the present invention, the following additional technical features may be provided:

in some embodiments, the flow directing structure comprises: the guide plates are arranged on the peripheral wall of the sleeve, and the guide plates extend spirally in the direction from the first pump shell to the second pump shell.

In some embodiments, the baffle is provided on an outer circumferential surface of the sleeve, and the baffle extends spirally from bottom to top in a direction around the impeller axis.

In some embodiments, the upper end of the sleeve is gradually flared from bottom to top; or the lower end of the sleeve is in a shape which is gradually retracted from top to bottom.

In some embodiments, the upper end of the heating tube is closed, and the second pump housing is connected to the upper end of the heating tube.

In some embodiments, the upper end of the heating pipe is closed by a cover plate, the second pump casing includes an inner plate, an outer plate, and a second top plate, the lower edge of the inner plate is connected to the peripheral edge of the cover plate, the lower edge of the outer plate is connected to the upper edge of the heating pipe, the second top plate is connected to the upper edge of the outer plate and the upper edge of the inner plate, and the second top plate, the inner plate, and the outer plate are connected to form a flow passage.

In some embodiments, the upper end of the flow guide structure is aligned with the lower edge of the inner plate, and the heating pipe is connected to or aligned with the lower edge of the outer plate.

In some embodiments, the second pump casing extends in a direction around the impeller axis, and the second top plate extends spirally upward in the direction around the impeller axis.

In some embodiments, the first pump casing comprises: the first top plate is connected with the enclosing plate and extends upwards in a spiral mode in the direction surrounding the axis of the impeller; the first pump shell is internally provided with a flow passage surrounding the axis of the impeller, two ends of the flow passage are respectively communicated with the first inlet and the first outlet, and the sectional area of the flow passage is gradually increased in the direction from the first inlet to the first outlet.

In some embodiments, at least one of the shroud and the first top panel is provided with a through hole.

In some embodiments, the first inlet is disposed on the first top plate and extends upward along the axis of the impeller.

In some embodiments, the flow guide structure is sleeved outside the first inlet.

In some embodiments, the top of the heating pipe is closed by a cover plate, the cover plate is connected with a water inlet pipe, the water inlet pipe extends in the up-down direction, and the lower end of the water inlet pipe is communicated with the first inlet of the first pump housing.

In some embodiments, the heating tube is a thick film heating structure.

Another object of the present invention is a dishwasher, comprising: the washing machine comprises an inner container, a water cup and a heating pump, wherein a washing cavity is arranged in the inner container; the water cup is arranged at the bottom of the inner container and communicated with the washing cavity; the heating pump is connected with the water cup, and the heating pump is according to any one of claims 1-14.

Drawings

Fig. 1 is a perspective view of a heat pump in one embodiment of the present invention.

Fig. 2 is a schematic view of a first pump casing configuration in an embodiment of the present invention.

Fig. 3 is a schematic view of the flow directing structure shown in fig. 1.

Fig. 4 is a schematic view of the heater tube structure shown in fig. 1.

Reference numerals:

the pump 100 is heated up and the heat is removed,

a first pump shell 1, an impeller 2, a heating pipe 3, a second pump shell 4, a flow guide structure 5, a cover plate 6 and a water inlet pipe 7,

the first inlet 11, the first outlet 12, the shroud 13, the first top plate 14, the sleeve 51, the baffle 52, the inner side plate 41, the outer side plate 42, the second top plate 43, and the second outlet 44.

Detailed Description

The heating power is an important parameter of the heating pump, and in the production and use of the heating pump, the heating power of the heating pump is usually increased according to actual needs (such as user setting or program setting in different default modes of an electric appliance including the heating pump) to meet the requirements for obtaining different outlet water temperatures, specifically, the power of the heating pipe is increased, and the power of the heating pipe is increased usually by increasing the pipe diameter and the pipe length, so that the size of a certain direction of the heating pump is inevitably large, and the performance, the size or the appearance of the whole product is influenced.

However, there is another way to increase the heating power, that is, to reduce the flow velocity of the water flow, so as to prolong the heat exchange time between the water flow and the heating pipe, and therefore, the present invention is directed to provide a heating pump, which does not increase the size of the heating pump, or even reduce the size of the heating pump to a certain extent, and does not affect the continuity of the water outlet in the pump, and can also increase the hydraulic efficiency, avoid the water flow loss, and further make the water outlet temperature and the flow velocity more stable and uniform.

In addition, the invention also provides a dish washing machine (not shown in the figure), which comprises an inner container, a water cup and a heating pump, wherein the water cup is arranged at the bottom of the inner container and communicated with a washing cavity in the inner container under normal conditions, the heating pump is connected with the water cup and used for pumping the water of the water cup into a spray arm in the washing cavity, and the spray arm is usually provided with at least one through hole or outlet so as to spray the water to a dish washing column in the washing cavity of the inner container of the dish washing machine, thereby achieving the purpose of washing dishes and the like.

The heating pump in the dish washer can directly pump out water with standard washing temperature in various modes set by a program of the dish washer, and then is supplemented with a certain amount of detergent and disinfectant to be sprayed into a washing tank or a washing cavity of the dish washer from a water spray nozzle, so that the effect of reducing the viscosity and the adhesion of oil stains is achieved, and the cleaning rate of dirt is improved. Here, the specific form of the dishwasher is not limited, and the present invention may be applied to a dishwasher for commercial use or a household dishwasher, or an embedded dishwasher, a table-top dishwasher, or a dishwasher device integrated with other kitchen appliances or household appliances, and the like. Meanwhile, the heat pump of the present invention has the following features, which will be explained in detail with reference to the accompanying drawings.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

As shown in fig. 1 to 4, a heat pump according to an embodiment of the present invention includes: the device comprises a first pump shell 1, an impeller 2, a heating pipe 3, a second pump shell 4 and a flow guide structure 5.

Wherein the first pump housing 1 has a first inlet 11 and a first outlet 12, the first inlet 11 is normally connected to a water inlet pipe, and the first outlet 12 is an outlet for discharging water from the pump. An impeller 2 is rotatably provided in the first pump casing 1, the impeller 2 is adapted to drive a fluid from a first inlet 11 to a first outlet 12, and an axis of the impeller 2 extends in an up-down direction. The heating pipe 3 covers the outer side of the first pump shell 1, the second pump shell 4 is communicated with the inner space of the heating pipe 3, and the first outlet 12 of the first pump shell 1 is communicated with the inner space of the heating pipe 3. When the water in the pump flows out from the first outlet 12, the water flow enters the inner space of the heating pipe 3 for heat exchange, and then the water flow carries the water temperature after heat exchange to flow into the second pump case 4.

Therefore, according to the heating pump 100 of the embodiment of the invention, due to the addition of the diversion structure 5 and the first pump casing 1, the size of the heating pipe 3 in the axial direction or the radial direction does not need to be increased, so that the heating effect can be realized in a limited pump cavity space without affecting the hydraulic efficiency. In other words, the space of the pump cavity is saved, the hydraulic efficiency is improved, and the heating function is realized.

Furthermore, a flow guiding structure 5 is arranged in the heating pipe 3 for guiding the water flow from the first outlet 12 of the first pump housing 1 to the inlet of the second pump housing 4. Wherein clean water for washing is introduced into and discharged from the first pump housing 1 through the first inlet 11 and is discharged from the first outlet 12 by the driving of the impeller 2. For example, when the impeller 2 is a centrifugal impeller, the impeller 2 in the first pump housing 1 rotates to drive water flow to centrifugally rotate and throw the water flow out of the first outlet 12, the thrown water flow enters the heating pipe 3 to exchange heat and then flows out of the second pump housing 4, and when the water flow enters the heating pipe 3, the water flow enters the second pump housing 4 along the rotating direction of the flow guide structure 5 to the maximum extent through the flow guide structure 5, so as to improve hydraulic efficiency. Of course, the impeller 2 in the present invention may be an axial flow impeller or the like.

As shown in fig. 3, the flow guide structure 5 of one embodiment of the present invention includes a sleeve 51 and a plurality of flow guide plates 52, the sleeve 51 extends in the up-down direction and is located inside the heating pipe 3, the flow guide plates 52 are provided on the peripheral wall of the sleeve 51, and the flow guide plates 52 extend spirally in the direction from the first pump casing 1 to the second pump casing 4. The water flow has a certain flow velocity after flowing out from the first outlet of the first pump shell 1, and when passing through the guide plate 52, the water flow can flow upwards under the guide effect of the guide plate 52 and then enters the inlet of the second pump shell 4. Through the diversion of the diversion plate 52, the water flow can be guided to the second pump shell 2 from the first pump shell 1 in a more orderly manner, so that the generation of turbulence is avoided, and the energy consumption is reduced.

The flow guiding structure 5 of the present invention can have different forms, for example, a sleeve 51 is provided on the inner wall of the heating pipe 3, and a flow guiding plate or a flow guiding sheet structure spirally rising upwards is formed on the inner peripheral wall of the sleeve 51; for another example, the sleeve 51 is integrated with the heating pipe, and the deflector is provided on the inner circumferential surface of the heating pipe.

In addition, optionally, the spiral rising direction of the guide plate in the invention may be the same as the direction of the water flow flowing out from the first pump housing 1, for example, when the heating pump is viewed from top to bottom, the first pump housing and the impeller cooperate to drive the water flow to flow out of the first pump housing in the clockwise direction, and correspondingly, the guide plate may be arranged in a form of extending spirally upwards in the clockwise direction.

For another example, in the diversion structure 5 shown in fig. 3, the diversion plate 52 is disposed on the outer circumferential surface of the sleeve 51, and the diversion plate 51 extends spirally from bottom to top in the direction surrounding the axis of the impeller, that is, the diversion water flow turns upward, and the main purpose is to divert the effluent in the first pump housing 1 upward into the second pump housing 4, so as to avoid vortex flow, thereby increasing the hydraulic efficiency.

As shown in fig. 3, the upper end of the sleeve 51 is gradually expanded from the bottom to the top, or the lower end of the sleeve 51 is gradually contracted from the top to the bottom. As shown in fig. 1 and 3, the upper end of the baffle structure 5 is aligned with the lower edge of the inner side plate 41, and the heating pipe 3 is connected to or aligned with the lower edge of the outer side plate 42 of the second pump casing 4.

As shown in fig. 1, in the present embodiment, the diversion structure 5 is sleeved on the water inlet pipe 7, since the first pump housing 1 is accommodated in the heating pipe 3, the diameter of the first pump housing 1 is smaller than that of the heating pipe 3, and the diameter of the first inlet 11 of the first pump housing 1 is smaller than that of the first pump housing 1, in order to better fix the sleeve 51 of the diversion structure 5 sleeved on the water inlet pipe 7, it must match the size of the water inlet pipe 7 to form a structure with an upper end extended to connect with the inner side plate 41 of the second pump housing 4, so as to guide the water into the second pump housing 4 and then discharge the water from the second outlet 44 in the second pump housing 4, thereby avoiding the hydraulic loss in the heating pipe 3. Alternatively, the upper end of the sleeve 51 is connected to the inner side plate 41 of the second pump housing 4, and then the lower end of the sleeve 51 forms a structure that is retracted downward and sleeved on the periphery of the water inlet pipe 7, so as to guide the water flow discharged from the outlet or through hole (not shown) of the first pump housing 1.

In addition, the upper end of the heating pipe 3 is closed, and the second pump housing 4 is connected to the upper end of the heating pipe. As shown in fig. 1 and 4, the heating pipe 3 is a barreled structure, the water flow inside the heating pipe flows to the second pump housing 4 under the guiding of the guiding structure 5, and the upper end of the barreled structure can be sealed by the edge of the upper end of the guiding structure 5, so as to prevent water from splashing upwards to affect the hydraulic efficiency and cause potential safety hazard. And the heating pipe 3 is communicated with the second pump housing 4, as shown in fig. 1, the second pump housing 4 is located at the upper part of the heating pipe 3, that is, in this embodiment, water enters the impeller 2 of the first pump housing 1 from the water inlet pipe 7 through the first inlet 11 to rotate and accelerate, then passes through the heating pipe 3 to heat, then enters the flow channel of the second pump housing 4 upwards, passes through the flow channel of the second pump housing 4, and flows out from the second outlet 44, thereby completing a process of pumping water upwards.

As shown in fig. 1 to 4, the upper end of the heating pipe 3 is closed by a cover plate 6, and the second pump casing 4 in this embodiment is structured to include an inner side plate 41, an outer side plate 42, and a second top plate 43. And the inner and

outer side plates

41 and 42 are referenced to the central position of the axis of the impeller 4 or the shroud 6. The shroud of the second pump casing 4 at a position close to the axial line of the impeller is an inner side plate 41, and the shroud at a position away from the axial line of the impeller 4 is an outer side plate 42.

The lower edge of the inner side plate 41 is connected with the peripheral edge of the cover plate 6, the lower edge of the outer side plate 42 is connected with the upper edge of the heating pipe, the second top plate 43 is connected with the upper edge of the outer side plate 42 and the upper edge of the inner side plate 41, and the second top plate 43, the inner side plate 41 and the outer side plate 42 are connected to form a flow passage. It can be seen that the heat pump in this embodiment has two pump chambers, and in addition to the pump chamber formed by the first pump housing 1, there is also a large heat pump chamber formed by the second pump housing 4 and the heating tube 3, otherwise referred to as a water pump chamber, outside thereof.

When the water flow is discharged from the first outlet 12 of the first pump housing 1, the water flow enters the water pump cavity and is discharged from the second water outlet of the second pump housing 4, here, the second pump housing 4 may be designed in a volute form, so as to improve the hydraulic efficiency of the discharged water flow. And the double-pump cavity double-flow-channel structure and the diversion structure 5 which are generated from the structure make the circulating water in the heating pump of the dish-washing machine flow out more slowly and uniformly, so that the dish-washing machine increases the heating power more easily, and avoids the hydraulic loss and the energy loss. Meanwhile, water flow can pass through the optimized flow passage, and the volume or the size of the pump cavity can not be increased, so that the size of the whole structure in the dish washing machine is saved, and the structural optimization of the dish washing machine is easier to a certain extent.

Of course, the second pump casing is not limited to the flow channel in the form of the volute, and when the impeller 4 is a centrifugal impeller, the flow channel should be in the form of an involute curve, so that the volute flow channel conforms to the movement characteristics of the water flow. However, when the impeller 4 is an axial-flow impeller, the first pump casing 1 and the second pump casing 2 may be designed as channels suitable for the axial-flow impeller, such as a barreled channel, and in general, the washing pump used in the dishwasher is a centrifugal water pump, but the present invention is not limited thereto.

As shown in fig. 1, the upper end of the flow guiding structure 5 is aligned with the lower edge of the inner plate 41, and the heating pipe 3 is connected to or aligned with the lower edge of the outer plate 42. In order to improve the sealing performance of the pump cavity structure of the heat pump 100 and avoid the waste of hydraulic power, the wall of the heating pipe is connected to the outer plate 42, which may be an integral structure or a sealed splicing structure, and for better diversion, the upper end of the diversion structure 5 is connected to the lower edge of the inner plate 41, so that the fluid (specifically, the purified water in the present invention) is directly diverted into the cavity of the second pump casing 4, and the hydraulic loss caused by the water flow hitting the pipe wall or the protruding part is avoided.

As shown in fig. 1, the second top plate 43 extends spirally upward in a direction around the axis of the impeller 2. In other words, the flow passage area of the second pump shell 4 is gradually increased, so that the water flow undergoes a diffusion and deceleration process, the water outlet flow in the second pump shell 4 is slow and uniform, the hydraulic efficiency of the water outlet is improved through the volute flow passage structure, the performance of the dish washing machine is improved, and the overall energy consumption of the dish washing machine is reduced.

As shown in fig. 2, the first pump casing 1 includes a shroud 13 and a first top plate 14, the shroud 13 is annular around the impeller 2, the first top plate 14 is connected to the shroud 13, and the first top plate 14 extends spirally upward in a direction around the axis of the impeller 2. A flow passage surrounding the axis of the impeller 2 is formed in the first pump casing 1, two ends of the flow passage are respectively communicated with the first inlet 11 and the first outlet 12, and the sectional area of the flow passage is gradually increased in the direction from the first inlet 11 to the first outlet 12.

In other words, the first pump housing 1 is a volute-like structure, the flow channel formed in the first pump housing 1 spirally rises around the axis of the impeller 2, and when the water flow passes through the first inlet 11 of the first pump housing 1 and is thrown to the first outlet 12 along the flow channel in the first pump housing 1, the cross-sectional area of the flow channel is gradually increased, as known to those skilled in the art, the process is a process of water flow diffusion and deceleration, such water outlet can reach a relatively gentle speed, so as to increase the time of the water flow in the heating pipe 3, that is, increase the heat exchange time of the water flow in the heating pipe 3, thereby improving the heat exchange to a greater extent. Here, the first pump housing 1 is not limited to a specific form of a volute structure, and the specific form may be determined according to a form of an impeller, in general, according to a motion characteristic of an effluent water flow.

In addition, at least one of the surrounding plate 13 and the first top plate 14 is provided with a through hole (not shown in the drawings). The purpose of setting up the through-hole at first pump case 1 is to increase the degree of consistency of going out water, can set up the through-hole to one or more for the rivers that gather together in the dispersion from the all directions of impeller 2 to make the play water in first pump case 1 more even distribution in heating pipe 3. It is obvious that the through holes herein may also be referred to as other discharge ports of the first pump case 1 except for the first outlet 12.

As shown in fig. 2, the first inlet 11 is provided on the first ceiling 14 and extends upward along the axis of the impeller 2. As shown in fig. 1, it may be arranged to extend all the way up to above the second pump housing 4 in order to facilitate filling of the pump chamber interior of the first pump housing 1 with water. And the outer side of first entry is located to water conservancy diversion structure 5 cover, forms a symmetrical distribution with the axis of first entry as the center, can make rivers more even. As shown in fig. 1 to 4, the upper end of the heating pipe 3 is closed by a cover plate 6, a water inlet pipe 7 is connected to the cover plate 6, a flow passage in the water inlet pipe 7 penetrates the cover plate 6 and communicates with the first pump case 1, the water inlet pipe 7 extends in the up-down direction, and the lower end thereof communicates with a first inlet 11 of the first pump case 1

In other words, the pipe extending from the first inlet 11 is the water inlet pipe 7, and the water inlet pipe 7 may be made of plastic material such as PE or PC, or may be made of metal material, and may be in a multi-section connection form, or may be an integral through pipe. The water entering the heating pump directly enters the inside of a pump cavity formed by the first pump shell 1 through the water inlet pipe 7, and then is spirally lifted by the strong centrifugal force obtained through the rotation of the centrifugal impeller 2, so that the water is thrown out of a water outlet or a through hole of the first pump shell 1.

As shown in fig. 1 to 4, the heating pipe 3 is a thick film heating structure. In general, the thick film heating tube 3 is formed by printing an insulating dielectric layer, a resistive layer, a conductive layer, a protective glaze layer, etc. on a substrate tube from the inside to the outside by a screen printing technique and then sintering them at a high temperature. As the name suggests, because of the barrel-shaped structure, the water channel can be used as a natural water channel, flowing water in the channel can be heated by 360 degrees, the whole body is uniformly heated, and the heating efficiency is not reduced due to the generation of a large number of bubbles on the surface of the heater. And because the heat can be conducted away in time, the surface temperature of the whole heating tube is not high, and open fire cannot be caused. And the safety is good, and the service life is long.

Therefore, the heating pump provided by the invention not only has all advantages of thick film heating, but also has the advantages of taking the integrity of the flow channel structure and the improvement of the heating efficiency into consideration, and simultaneously ensures the applicability of the product size, and has the advantages of reasonable structure and wide practical range.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A heat pump, comprising:

a first pump housing having a first inlet and a first outlet;

an impeller rotatably disposed within the first pump housing, the impeller adapted to drive fluid from the first inlet to the first outlet, an axis of the impeller extending in an up-down direction;

the heating pipe is covered on the outer side of the first pump shell, a first outlet of the first pump shell is communicated with the inner space of the heating pipe, and the upper end of the heating pipe is sealed by a cover plate;

the second pump shell is communicated with the inner space of the heating pipe and connected to the upper end of the heating pipe, the second pump shell comprises an inner side plate, an outer side plate and a second top plate, the lower edge of the inner side plate is connected with the periphery of the cover plate, the lower edge of the outer side plate is connected with the upper edge of the heating pipe, the second top plate is connected with the upper edge of the outer side plate and the upper edge of the inner side plate, the second top plate, the inner side plate and the outer side plate are connected to form a flow channel, the heating pipe is connected with or aligned with the lower edge of the outer side plate, the second pump shell extends in the direction surrounding the axis of the impeller, and the second top plate extends upwards in the direction surrounding the axis of the impeller in a spiral mode;

the water conservancy diversion structure, the water conservancy diversion structure is located in the heating tube, just the water conservancy diversion structure is constructed to follow first pump case is to the water conservancy diversion of second pump case, the water conservancy diversion structure includes sleeve pipe and a plurality of guide plate, the sleeve pipe extends and is located along upper and lower direction the heating pipe is inboard, the guide plate is located on the sheathed tube perisporium, and the guide plate is at the direction from first pump case to second pump case upwards spiral extension, the guide plate is located on the sheathed tube outer peripheral face, and the guide plate is at the direction of encircleing the impeller axis from the bottom up spiral extension, the sheathed tube upper end is the shape that from the bottom up expands gradually outward, sheathed tube lower extreme is the shape that from the top down contracts gradually, the upper end of water conservancy diversion structure aligns with the lower border of interior plate,

wherein, first pump case includes bounding wall and first roof, the bounding wall is and encircles the annular of impeller, first roof with the bounding wall links to each other, just first roof is encircleing the spiral extends that makes progress in the direction of impeller axis, form in the first pump case and encircle the runner of impeller axis, the both ends of runner communicate respectively first entry with first export, and in the direction from first entry to first export the sectional area of runner crescent, the heating pipe is thick film heating structure, the thick film heating pipe adopts the screen printing technique from inside to outside respectively for printing insulating medium layer, resistance layer, conductor layer, protection glaze layer on the substrate pipe, and the rethread high temperature sintering forms.

2. A heat pump according to claim 1, wherein at least one of the shroud and the first top plate is provided with a through hole.

3. A heat pump according to claim 2, wherein the first inlet is provided in the first top plate and extends upward along the axis of the impeller.

4. A heat pump as claimed in claim 3, wherein the flow guide structure is sleeved outside the first inlet.

5. A heat pump according to any one of claims 1 to 4, wherein a water inlet pipe is connected to the cover plate, the water inlet pipe extends in an up-down direction, and a lower end of the water inlet pipe communicates with the first inlet of the first pump case.

6. A dishwasher, comprising:

the washing device comprises a liner, a washing cavity and a washing cavity, wherein the liner is internally provided with the washing cavity;

the water cup is arranged at the bottom of the inner container and communicated with the washing cavity;

a heat pump connected to the cup, the heat pump according to any one of claims 1-5.