CN112137538B

CN112137538B - Dish washer

Info

Publication number: CN112137538B
Application number: CN201910566353.0A
Authority: CN
Inventors: 宋华诚; 杨林; 王科; 陈玉玲; 张青青; 刘维彤
Original assignee: Qingdao Haier Dishwasher Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Dishwasher Co Ltd; Haier Smart Home Co Ltd
Priority date: 2019-06-27
Filing date: 2019-06-27
Publication date: 2024-04-30
Anticipated expiration: 2039-06-27
Also published as: CN112137538A

Abstract

The invention discloses a dish washer, which is internally provided with a water tank and a heat pump system, wherein the heat pump system comprises: the evaporator, the compressor and the sleeve heat exchange device comprise sleeves, and different sleeves are sequentially communicated through a first connecting structure to form a water flow channel; the evaporator, the compressor and the double pipe heat exchange device are arranged around the water tank and are respectively positioned at different sides of the water tank. The heat pump system of the dish washer has the advantages that the whole size of the heat pump system of the dish washer is greatly reduced, the occupied space is small, all parts of the heat pump system are arranged around the water tank, the parts are reasonably arranged, the installation and maintenance of all parts are convenient, more effective washing space is provided, and the aim of convenient disassembly and cleaning can be fulfilled.

Description

Dish washer

Technical Field

The invention belongs to the field of dish washers, and particularly relates to a dish washer.

Background

Dish washing machines are devices for automatically washing dishes such as bowls, chopsticks, plates, dishes, knives, forks and the like, and can be divided into two main types according to structures. It reduces labor intensity for the cooking staff in dining room, hotel and institution canteen, improves working efficiency and improves sanitation. Nowadays, various small-sized dish washers have gradually entered into ordinary households.

At present, some dish washers use a heating pipe to supply water to the dish washer, the heating pipe is arranged in a water tank at the bottom of the inner container, and the water is circulated by a circulating pump to wash tableware while the heating pipe is used for heating during washing. However, this method consumes a large amount of power, and the drying is not complete. Some dishwashers employ a heat pump system to heat the wash water. For example, the utility model provides a Chinese patent application number 201420465616.1, named a heat pump type dish washer, which comprises an inner container, a compressor, a condenser, a throttling device and an evaporator, wherein the condenser is closely attached to the outer wall of the inner container or wound on the outer wall of the inner container outside a water tank; the outlet of the condenser is connected with the inlet of the evaporator through the throttling device, and the outlet of the evaporator is connected with the inlet of the compressor.

In the existing dish washer adopting the heat pump system, the condenser is generally a double-pipe heat exchanger, and the double-pipe heat exchanger is bent into a spiral shape. The heat exchanger for the dish washer has the defects that firstly, the occupied area is large, the space inside the spiral cannot be effectively utilized, and secondly, pollutants in the tableware are not easy to discharge once entering the sleeve. Because the whole double-pipe heat exchanger is formed by bending a long pipe, the double-pipe heat exchanger cannot be processed by adopting manual maintenance in time.

The present invention has been made in view of this.

Disclosure of Invention

The invention provides a dish washer, and the double-pipe heat exchange device of the dish washer is convenient to detach and clean, and all parts of a heat pump system are arranged around a water tank, so that the arrangement is reasonable, the installation and maintenance of all parts are convenient, the space is saved, and more effective washing spaces are provided.

In order to solve the technical problems, the invention adopts the basic conception of the technical scheme that:

the invention aims to provide a dish washing machine, wherein a water tank and a heat pump system are arranged in the dish washing machine, and the heat pump system comprises:

An evaporator and a compressor, wherein the evaporator and the compressor,

The sleeve heat exchange device comprises sleeves, wherein different sleeves are sequentially communicated through a first connecting structure to form a water flow channel; the evaporator, the compressor and the double pipe heat exchange device are arranged around the water tank and are respectively positioned at different sides of the water tank.

In a further scheme, the sleeve heat exchange device comprises a sleeve, and the first connecting structure is detachably arranged at the water inlet end and/or the water outlet end of the sleeve; or comprises a plurality of sleeves, and different sleeves are sequentially communicated through a detachable first connecting structure;

preferably, the first connection structure comprises an elbow.

In a further scheme, the sleeve heat exchange device comprises a plurality of sleeves, and central axes of the plurality of sleeves are arranged in parallel;

Preferably, the sleeve heat exchange device further comprises a positioning structure, wherein the positioning structure is connected with each sleeve, and the sleeves are positioned and kept at a certain interval through the positioning structure. In a further scheme, the evaporator and the sleeve heat exchange device are arranged on two opposite sides of the water tank;

The dish washer comprises a shell, a door body is arranged on one side of the shell, the water tank is positioned at the bottom in the shell, and the double-pipe heat exchange device is communicated with the water tank and is arranged on one side of the water tank facing the door body;

preferably, the central axes of the plurality of bushings are arranged parallel to the width direction of the door body. Further, the evaporator is arranged on one side of the water tank, which is away from the door body;

preferably, the evaporator is a fin type evaporator, and the central axis of the fin type evaporator is parallel to the width direction of the side wall of the shell.

Further scheme, the evaporator, the compressor and the sleeve heat exchange device are distributed around the water tank in a U-shaped mode, the evaporator and the sleeve heat exchange device are arranged on two opposite sides of the water tank, and the compressor is arranged at the bent part of the U-shaped mode and is opposite to the opening of the U-shaped mode.

Further, a circulating pump is further arranged in the dish washer, the circulating pump is arranged at the opening of the U-shaped part, the liquid inlet of the circulating pump is communicated with the water outlet of the sleeve heat exchange device, and the liquid outlet of the circulating pump is connected with the water diversion valve of the dish washer.

Further, the dishwasher further comprises a water softening device, wherein the water softening device is arranged at the opening of the U shape and is close to the circulating pump, and the water softening device is communicated with the water tank;

Preferably, the circulating pump is arranged on the side of the water softening device facing the water tank.

The sleeve comprises an outer pipe and an inner pipe, wherein the inner pipe is arranged in the outer pipe, the end part of the inner pipe extends out of the outer pipe, and the first connecting structure is arranged at the end part of the inner pipe of one sleeve, or the inner pipes of different sleeves are sequentially communicated through the first connecting structure;

preferably, the connecting device comprises a plurality of sleeves, wherein the first connecting structure is an elbow, two ends of the elbow are respectively connected with the end parts of the inner tubes of the two sleeves, and a detachable bending part is formed between the two sleeves.

In a further scheme, the end part of the outer tube is in closed connection with the outer wall of the inner tube; the side part of the outer tube of one sleeve is provided with a refrigerating medium inlet and a refrigerating medium outlet, or the outer tubes of a plurality of sleeves are sequentially communicated through a second connecting structure to form a refrigerating medium channel;

Preferably, the second connection structure is a connection pipe, two ends of the connection pipe are respectively communicated with side walls of the outer pipes of the two sleeves, and areas between the inner pipes and the outer pipes of the plurality of sleeves are sequentially communicated.

Further, the sleeve heat exchange device is provided with a water inlet and a water outlet of the water flow channel, the water inlet and the water outlet are positioned at two ends of the sleeve, one end of the sleeve, provided with the water inlet, is close to the water tank, and one end of the sleeve, provided with the water outlet of the water flow channel, is close to the circulating pump.

After the technical scheme is adopted, compared with the prior art, the invention has the following beneficial effects:

1. the independent sleeves of the sleeve heat exchange device of the dish washer are communicated through the connecting component, namely the first connecting structure, and the positions of the sleeves and the intervals between the sleeves can be arranged according to the needs, so that the whole volume of the sleeve heat exchange device is reduced, the occupied space is saved, and the purposes of compact arrangement and space saving are achieved. The first connecting structure and the sleeve can be fixedly connected or detachably connected.

2. According to the first connecting structure between the sleeves of the sleeve heat exchange device of the dish washer, a detachable connection mode is preferably adopted, a user or a maintainer can clean foreign matters entering along with washing water inside each sleeve at any time in a mode of detaching the connecting part, the maintenance is convenient, the blockage in the sleeve is avoided, and the service life of the sleeve heat exchange device can be prolonged.

3. The evaporator, the compressor and the sleeve heat exchange device of the heat pump system of the dish washer are arranged around the water tank, so that the arrangement is reasonable, the arrangement is compact, the installation is convenient, and the effective washing space of the dish washer is not excessively occupied.

The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. It is evident that the drawings in the following description are only examples, from which other drawings can be obtained by a person skilled in the art without the inventive effort. In the drawings:

FIG. 1 is a schematic view of a heat exchanging apparatus for a tub of a dishwasher according to the present invention;

FIG. 2 is another schematic structural view of a heat exchanging device for a tub of a dishwasher according to the present invention;

FIG. 3 is a schematic cross-sectional view of a heat exchanging apparatus for a tub of a dishwasher according to the present invention;

FIG. 4 is a schematic side view of a side structure of a dishwasher of the present invention;

FIG. 5 is a schematic side view of another side structure of the dishwasher of the present invention;

FIG. 6 is a schematic side elevational view of a further side of the dishwasher of the present invention;

FIG. 7 is a side view of the bottom of the inventive dishwasher;

FIG. 8 is a top view of the bottom of the dishwasher;

In the figure: 1 sleeve, 2 outer tube, 3 inner tube, 4 first connecting structure, 5 second connecting structure, 6 water inlet, 7 water outlet, 8 refrigerating medium inlet, 9 refrigerating medium outlet, 10 fixing frame, 11 through hole, 12 supporting feet, 13 first sleeve, 14 second sleeve, 15 third sleeve; 16 water flow channels, 17 refrigeration medium channels;

20 shells, 21 doors, 22 water tanks, 23 circulating pumps and 24 drainage pumps; 25 shunt valve; 26 heating the module;

30 evaporator, 31 fan, 32 double pipe heat exchanger, 33 compressor, 34 drier-filter.

It should be noted that these drawings and the written description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept to those skilled in the art by referring to the specific embodiments.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention, and the following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Example 1

As shown in fig. 1 to 3, the present embodiment provides a sleeve heat exchange device for a dish washer, which includes a sleeve, and different sleeves are sequentially connected through a first connection structure to form a water flow channel.

The sleeve heat exchange device of the embodiment comprises one or more linear sleeves which are independently arranged, and the independent sleeves are communicated through the first connecting structure to form a water flow channel, so that the positions of the sleeves and the distance between the sleeves can be controlled according to the needs, the whole volume of the sleeve heat exchange device is reduced, the occupied space is saved, and the purposes of compact arrangement and space saving are achieved. The first connecting structure and the sleeve can be fixedly connected, such as welding; detachable connections, such as sockets, etc., may also be used.

For convenient maintenance and cleaning, the double pipe heat exchange device includes: a sleeve 1, a detachable first connecting structure 4 is arranged at the water inlet end and/or the water outlet end of the sleeve 1,

Or a plurality of sleeves 1, different sleeves 1 are sequentially communicated through a detachable first connecting structure 4 to form a water flow channel 16.

In this embodiment, each sleeve 1 is independently provided. According to the model size of dish washer, sleeve pipe heat transfer device can include a sleeve pipe 1, also can be by two sleeve pipes 1 and the combination of the sequential intercommunication of sleeve pipe 1 more than two through detachable first connection structure 4. For a spiral casing 1, the bending part of the casing 1 is easy to accumulate foreign matters and cannot be cleaned, in this embodiment, the first connecting structure 4 between the independent casings 1 can be detached, so that the connecting part of the casing 1, which is easy to accumulate the foreign matters, can be easily detached for cleaning, and a user or a maintainer can clean the foreign matters entering along with the washing water inside each casing 1 at any time in a mode of detaching the connecting part, so that the casing 1 is convenient to maintain, the blockage in the casing 1 is avoided, and the service life of the casing heat exchange device can be prolonged.

When the sleeve heat exchange device only comprises one sleeve 1, the sleeve 1 comprises an outer tube 2 and an inner tube 3 which are coaxially arranged, at least the inner tube 3 of the sleeve 1 is of a linear type, water flows in the inner tube 3, refrigerating media flow between the inner tube 3 and the outer tube 2, the ends of the inner tube 3 and the outer tube 2 are in closed connection, a water inlet 6 and a water outlet 7 are arranged on the inner tube 3, and a refrigerating media inlet 8 and a refrigerating media outlet 9 are arranged on the outer tube 2. The water inlet 6 and the water outlet 7 of the inner tube 3 may be connected to other structures, such as a water tank 22, etc., by means of a detachable first connection structure 4. The sleeve 1 is linear, foreign matters are not easy to accumulate, and the joint of the sleeve 1 and other structures can be detached, so that the sleeve heat exchange device can be cleaned conveniently.

When the sleeve heat exchange device comprises two or more independent sleeves 1, different sleeves 1 are sequentially communicated through the detachable first connecting structure 4, so that a longer water flow channel 16 is formed by combination, the washing water and the refrigerating medium can be ensured to perform sufficient heat exchange, and the joints between different sleeves 1 can be cleaned conveniently. The lengths and diameters of the different sleeves 1 may be the same or different.

Each independent sleeve 1 comprises an outer tube 2 and an inner tube 3, wherein the inner tube 3 is arranged inside the outer tube 2, the end part of the inner tube 3 extends out of the outer tube 2, and the inner tubes 3 of different sleeves 1 are sequentially communicated through a first connecting structure 4. The first connecting structure 4 is an elbow, preferably a soft rubber tube, two ends of the elbow are respectively connected with the end parts of the inner tubes 3 of the two sleeves 1, and a detachable bending part is formed between the two sleeves 1.

In this scheme, at least the inner tube 3 of every sleeve pipe 1 is the straight tube, and the preferential smooth pipe avoids the foreign matter in the washing water to store up in sleeve pipe 1, and user or maintainer only need dismantle the return bend of two sleeve pipe 1 junction clear up can.

In the scheme, in order to realize the independence of two channels of water flow and refrigeration medium, the end part of the outer tube 2 is welded and sealed with the outer wall of the inner tube 3; the side parts of the outer tubes 2 of the plurality of sleeves 1 are sequentially communicated through the second connecting structure 5 to form a refrigerating medium channel 17; among the plurality of sleeves 1 forming the refrigerating medium channel 17, the sleeves 1 at the head end and the tail end are provided with a refrigerating medium inlet 8 and a refrigerating medium outlet 9, and the other sleeves 1 are communicated through a second connecting structure 5.

The second connection structure 5 is a connection pipe, and may be made of a material that is not affected by the cooling medium, for example, the connection pipe may be a copper pipe. The two ends of the connecting pipe are respectively communicated with the side walls of the outer pipes 2 of the two sleeves 1, so that the areas between the inner pipes 3 and the outer pipes 2 of the plurality of sleeves 1 are sequentially communicated to form a refrigerating medium channel 17. The communication part of the connecting pipe and the outer pipe 2 is close to the end part of the outer pipe 2; the connecting pipe can be a straight pipe or an arc pipe.

Because the space inside the dish washer is limited, the space occupied by the existing spiral sleeve 1 is also larger, and the space between the spirals cannot be effectively utilized, so that the space is wasted. The multiple sleeves 1 in the embodiment are independently arranged, so that the positions of the sleeves 1 and the intervals between the sleeves 1 can be controlled according to the specific conditions of the size of the dish washer, the whole volume of the sleeve heat exchange device is reduced, and the occupied space is saved.

Because the plurality of sleeves 1 are independently arranged, the inner pipes 3 of different sleeves 1 are connected through the bent pipe, and the arrangement modes of the plurality of sleeves 1 can be various. The plurality of sleeves 1 may be arranged back and forth, left and right, or may be arranged in parallel or at a certain angle.

As a preferred embodiment, the central axes of the plurality of bushings 1 are parallel to each other, in such a way that the space occupied is relatively small. The central axes of the plurality of bushings 1 may be located on the same plane or on different planes. When the two sleeves 1 are included, the two sleeves 1 are arranged in parallel, namely, the two sleeves are adjacent and parallel; when three or more sleeves 1 are included, all the sleeves 1 may be arranged in parallel on the same plane, or may be arranged in parallel on different planes.

As a specific way, the sleeve 1 comprises three sleeves 1, wherein the three sleeves 1 are arranged in parallel and are arranged in parallel on the same plane, or the circle centers of the sections of the three sleeves 1 form the vertexes of a triangle; therefore, the whole volume of the sleeve heat exchange device can be reduced, and occupied space is saved.

Further, in order to fix the positions of the plurality of sleeves 1, in this embodiment, the sleeve heat exchange device further includes a positioning structure, where the positioning structure is connected with each sleeve 1, and the sleeves 1 are positioned and keep a certain distance therebetween by the positioning structure. The positioning structure has the functions of fixing the plurality of sleeves 1 at one place to form a whole, limiting the whole occupied space, limiting the relative positions among the plurality of sleeves, keeping a certain distance among the sleeves and avoiding blockage caused by excessive bending of the bent pipes connected among the sleeves.

The fixing structure comprises a fixing frame 10, wherein through holes 11 matched with the outer diameters of the sleeves 1 are formed in the fixing frame 10, and the sleeves 1 are connected with the fixing frame 10 through the corresponding through holes 11. The number of through holes corresponds to the number of the sleeves, and the diameter of the through holes corresponds to the outer diameter of the sleeves. When the outer diameters of the sleeves are the same, the diameters of the through holes are the same, and when the outer diameters of the different sleeves are different, the diameters of the through holes are in one-to-one correspondence with the outer diameters of the sleeves, so that the positioning and fixing effects are achieved.

The bottom of the fixing frame 10 is also provided with supporting feet 12, and the supporting feet 12 are arranged perpendicular to the fixing frame 10 and supported on a plane below the sleeve heat exchange device. The plane here may be the bottom wall of the dishwasher housing 20 or other surface on which the double pipe heat exchanger is placed. The supporting leg 12 is plate-shaped, and may be formed by bending the bottom of the fixing frame 10, or may be connected to the fixing frame 10 in an independent structure.

Further, in order to ensure the heat exchange efficiency of the sleeve heat exchange device, a heat insulation structure is further arranged on the periphery of the sleeve 1 and/or between the sleeves 1 to insulate the sleeve 1; the heat insulation structure is a heat insulation layer made of heat insulation materials.

Further, the water inlet 6 and the water outlet 7 of the water flow channel 16 are positioned on the same sleeve 1 or on different sleeves 1, and the water inlet 6 and the water outlet 7 are positioned at two ends of the sleeve 1 so as to have sufficient space to be connected with different devices, thereby forming a passage for the washing water to enter the inner container of the dish washer. For example, the water inlet 6 of the water flow channel 16 is connected with the water tank 22, the water outlet 7 is connected with the circulating pump 23, and when the circulating pump 23 works, water in the water tank 22 enters the inner container of the dish washer through the water flow channel 16 and the circulating pump 23 in the sleeve 1.

As a more specific embodiment, a double pipe heat exchange device with three double pipes 1 is described:

The sleeve heat exchange device comprises a first sleeve 13, a second sleeve 14 and a third sleeve 15, wherein the first sleeve 13, the second sleeve 14 and the third sleeve 15 are straight pipes and are arranged in parallel. The third sleeve 15 is located above the first sleeve 13, the center of the second sleeve 14 is located on the central line of the connecting line of the centers of the sections of the first sleeve 13 and the third sleeve 15, and the centers of the sections of the three sleeves 1 form the vertexes of an isosceles triangle. One end of the inner tube of the second sleeve 14 is communicated with the end part of the inner tube of the first sleeve 13 through the bent tube, the other end of the inner tube of the third sleeve 15 through the bent tube, and the free end parts of the inner tubes of the first sleeve 13 and the third sleeve 15 respectively form the water inlet 6 and the water outlet 7, thus forming the water flow channel 16. The side wall of one end of the outer tube of the second sleeve 14 is communicated with the side wall of the outer tube of the first sleeve 13 through a copper tube, and the side wall of the other end is communicated with the side wall of the outer tube of the third sleeve 15 through a copper tube. The side wall of the outer tube of the first sleeve 13, which is close to the water inlet 6, is provided with a refrigerating medium outlet 9, and the side wall of the outer tube of the third sleeve 15, which is close to the water outlet 7, is provided with a refrigerating medium inlet 8, thus forming a refrigerating medium channel 17. The direction of the water flow is opposite to the flow direction of the refrigerant medium.

The fixing frame 10 which is vertically placed is provided with three through holes 11, which comprises a first through hole, a second through hole and a third through hole, wherein the third through hole is positioned above the first through hole, the circle center of the second through hole is positioned on the central line of the connecting line of the circle centers of the sections of the first through hole and the third through hole, and the circle centers of the sections of the three through holes form the vertex of an isosceles triangle. The three sleeves 1 respectively pass through the corresponding through holes one by one and are fixed. An insulating layer is arranged between the three sleeves.

In this embodiment, the double pipe heat exchanging device may be used as a condenser of a heat pump module of the dishwasher, heating the washing water during the washing cycle and the drying cycle of the dishwasher.

Example two

As shown in fig. 4-6, the present embodiment provides a dishwasher, which includes a housing 20, a door 21 is disposed on one side of the housing 20, a liner of the dishwasher is disposed in the housing 20, a spray arm is disposed in the liner, and a water tank 22, a circulation pump 23 and a heat pump system are disposed at the bottom of the liner.

In this embodiment, the condenser of the heat pump system is a double-pipe heat exchange device, and the double-pipe heat exchange device in this embodiment is the double-pipe heat exchange device described in embodiment one. The sleeve heat exchange device is respectively communicated with the water tank 22 and the circulating pump 23, and when the circulating pump 23 works, water in the water tank 22 sequentially passes through the water tank water outlet, the sleeve heat exchange device, the circulating pump and the spray arm to enter the liner for washing.

Specifically, when the double-pipe heat exchange device only comprises one double-pipe 1, the double-pipe 1 comprises an outer pipe 2 and an inner pipe 3 which are coaxially arranged, the inner pipe 3 is of a linear type, water supply flows in the inner pipe 3, refrigerating media flow between the inner pipe 3 and the outer pipe 2, the ends of the inner pipe 3 and the outer pipe 2 are in closed connection, a water inlet 6 and a water outlet 7 are arranged on the inner pipe 3, and a refrigerating media inlet 8 and a refrigerating media outlet 9 are arranged on the outer pipe 2.

The water inlet 6 of the sleeve 1 is communicated with the water outlet of the water tank, the water outlet 7 is communicated with the water inlet of the circulating pump, the position height of the axis of the sleeve 1 is not lower than the water outlet of the water tank and not higher than the water inlet of the circulating pump, so that the circulating pump 23 works when the dish washing machine works, negative pressure is formed at the water inlet of the circulating pump, washing water enters the sleeve 1 from the water tank 22 to exchange heat with a refrigerating medium, and the washing water is heated, enters the circulating pump 23 to be pressurized and then is conveyed to the spray arm to wash tableware. When the circulating pump 23 stops working, water flow in the liner and the sleeve 1 can flow back into the water return groove 22 under self gravity according to the liquid level of water for the dish washer, so that the cleanliness in the sleeve 1 is maintained, and bacteria are prevented from breeding in the sleeve 1.

When the sleeve heat exchange device comprises at least two sleeves 1, different sleeves 1 are sequentially communicated through a detachable first connecting structure 4, namely an elbow pipe, so as to form a water flow channel 16; along the water flow direction, the sleeve 1 at the beginning end of the water flow channel 16 is communicated with the water outlet of the water tank, and the height of the axis of the sleeve is not lower than the water outlet of the water tank; the sleeve 1 at the end of the water flow channel 16 is communicated with the water inlet of the circulating pump, and the axial height of the sleeve is not higher than that of the water inlet of the circulating pump.

Further, along the water flow direction, the heights of the axes of the plurality of sleeves 1 gradually rise in sequence, the water inlets 6 of the water flow channels 16 are arranged on the sleeve 1 with the lowest axis position, and the water outlets 7 of the water flow channels 16 are arranged on the sleeve 1 with the highest axis position. In this way, in the water flow direction, the height of the water flow channel 16 gradually increases, when the circulating pump 23 stops working, water flow in the water flow channel 16 can flow back under self gravity, and the water flows back into the water tank 22, so that the cleaning in the sleeve 1 is maintained, and bacterial growth is reduced.

For each sleeve 1, the axis of each sleeve 1 may be parallel to the horizontal plane, or may be inclined at an angle to the horizontal plane. When the sleeve is inclined, the height of the water inlet end is lower than that of the water outlet end, so that water flow backflow is facilitated.

Further, the sleeve 1 is positioned between the water tank 22 and the circulating pump 23 in the water flow direction, one end of the sleeve 1 provided with the water inlet 6 of the water flow channel 16 is close to the water tank 22, and one end of the sleeve 1 provided with the water outlet 7 of the water flow channel 16 is close to the circulating pump 23. Thus, the two ends of the sleeve heat exchange device are respectively provided with sufficient space to be connected with the water tank 22 and the circulating pump 23.

The water tank 22 and the circulation pump 23 may be provided at both ends of the same side in the axial direction of the casing 1, at both ends of different sides in the axial direction of the casing 1, or at both ends of the end of the casing 1, respectively. In either way, the water inlet 6 and the water outlet 7 of the water flow channel 16 are positioned at the two ends of the sleeve 1, so that more space can be reserved, and the connection and the installation of the sleeve heat exchange device, the water tank and the circulating pump are facilitated.

Further, the water tank 22 is located at the bottom of the casing 20, and the double pipe heat exchange device is located at the bottom of the casing 20 and is disposed at a side of the water tank 22 facing the door 21.

The water tank 22 is located at the bottom of the housing 20 and below the liner. The position between the tub 22 and the door 21 of the dishwasher is defined as the front side of the tub 22, the position between the tub 22 and the back plate opposite to the door 21 of the dishwasher is defined as the rear side of the tub 22, and the double pipe heat exchanger is located at the bottom inside the housing 20 and on the side of the tub 22 facing the door 21, i.e. on the front side of the tub 22.

Further, the water pump device further comprises a water pump 24, the water pump 24 is communicated with the water tank 22, the positions of the axes of all the sleeves 1 in the sleeve heat exchange device are higher than the positions of the communicated positions of the water pump 24 and the water tank 22, so that when water in the water tank 22 is discharged by the water pump 24, the water in the sleeve 1 can flow backwards and is discharged by the water tank 22 and the water pump 24, the cleaning in the sleeve 1 is facilitated, and bacterial breeding is reduced.

The plurality of sleeves 1 in the embodiment comprise an outer tube 2 and an inner tube 3, wherein the inner tube 3 is arranged inside the outer tube 2, the end part of the inner tube 3 extends out of the outer tube 2, and the end part of the outer tube 2 is in closed connection with the outer wall of the inner tube 3; the side parts of the outer tubes 2 of the plurality of sleeves 1 are sequentially communicated through connecting tubes to form a refrigerating medium channel 17; the ends of the inner tubes 3 of the plurality of sleeves 1 are sequentially communicated through bent pipes to form a water flow channel 16.

In order to fix the positions of the plurality of sleeves, in this embodiment, the sleeve heat exchange device further includes a positioning structure, the positioning structure is connected with each sleeve, and the sleeves are positioned and keep a certain distance through the positioning structure. The positioning structure has the functions that the plurality of sleeves are fixed at one position to form a whole, the whole occupied space is limited, the relative positions among the plurality of sleeves can be limited, a certain interval is kept among the sleeves, and the blockage caused by excessive bending of bent pipes connected among the sleeves is avoided.

The sleeve heat exchange device comprises a first sleeve 13, a second sleeve 14 and a third sleeve 15, wherein the first sleeve 13, the second sleeve 14 and the third sleeve 15 are straight pipes and are arranged in parallel. The third sleeve 15 is located above the first sleeve 13, the center of the second sleeve 14 is located on the central line of the connecting line of the centers of the sections of the first sleeve 13 and the third sleeve 15, and the centers of the sections of the three sleeves 1 form the vertexes of an isosceles triangle. One end of the inner tube of the second sleeve 14 is communicated with the end part of the inner tube of the first sleeve 13 through the bent tube, the other end of the inner tube of the third sleeve 15 through the bent tube, the free end part of the inner tube of the first sleeve 13 forms the water inlet 6, and the free end part of the inner tube of the third sleeve 15 forms the water outlet 7, thus forming the water flow channel 16. The side wall of one end of the outer tube of the second sleeve 14 is communicated with the side wall of the outer tube of the first sleeve 13 through a copper tube, and the side wall of the other end is communicated with the side wall of the outer tube of the third sleeve 15 through a copper tube. The side wall of the outer tube of the first sleeve 13, which is close to the water inlet 6, is provided with a refrigerating medium outlet 9, and the side wall of the outer tube of the third sleeve 15, which is close to the water outlet 7, is provided with a refrigerating medium inlet 8, thus forming a refrigerating medium channel 17. The three bushings 1 are fixed and positioned by a fixing frame 10.

In this way, the positions of the axes of the first sleeve 13, the second sleeve 14 and the third sleeve 15 are gradually increased in sequence, the water inlet 6 is arranged on the first sleeve 13 with the lowest axis position, the water outlet 7 of the first sleeve 13 is connected with the water tank water outlet, and the position of the axis of the first sleeve 13 is not lower than the water tank water outlet; so that the water in the sleeve 1 can be drained back into the tub 22 of the dishwasher when not in operation. The water outlet 7 is arranged on a third sleeve 15 with the highest axis position, the water outlet 7 of the third sleeve 15 is connected with a water inlet of the circulating pump, and the axis position of the third sleeve 15 is not higher than the water inlet of the circulating pump; when the circulation pump 23 works, negative pressure is formed at the water inlet of the circulation pump, washing water enters the sleeve 1 from the water tank 22 to exchange heat with the refrigerating medium, is heated, enters the washing pump to be pressurized, and is conveyed to the spray arm to wash tableware.

Meanwhile, the position of the axis of the first sleeve 13 is not lower than the communication position of the drain pump 24 and the water tank 22, so that the water in the sleeve 1 can flow back into the water tank 22 and be discharged through the drain pump 24 during drainage.

In addition, the embodiment also provides a control method of the dish washer, which comprises the following steps:

when the dish washer works, the circulating pump 23 is started, and washing water in the water tank 22 sequentially enters the inner container of the dish washer through the sleeve heat exchange device and the circulating pump 23;

when the operation is stopped, the water in the liner and the sleeve heat exchange device can flow back to the water tank 22;

When the dish washer drains, the drain pump 24 works, and the water in the liner and the double-pipe heat exchange device flows back to the water tank 22 and is discharged by the drain pump 24.

As a specific aspect, a control method of a dishwasher includes:

When the dish washer works, the circulating pump 23 is started, washing water in the water tank 22 enters the inner pipe of the first sleeve 13 from the water inlet 6, and enters the inner container of the dish washer through the inner pipe of the second sleeve 14, the inner pipe of the third sleeve 15, the circulating pump 23 and the spray arm;

When the water tank stops working, the water in the liner and the sleeve heat exchange device can flow back to the water tank 22 through the third sleeve 15, the second sleeve 14 and the first sleeve 13 in turn under the action of self gravity;

When the dish washer drains, the drain pump 24 works, and water in the liner and the sleeve heat exchange device can flow back to the water tank 22 through the third sleeve 15, the second sleeve 14 and the first sleeve 13 in sequence, and is discharged by the drain pump 24.

Example III

As shown in fig. 7 and 8, the present embodiment provides a dishwasher, which includes a housing 20, a door 21 is disposed on one side of the housing 20, a liner of the dishwasher is disposed in the housing 20, a spray arm is disposed in the liner, and a water tank 22, a circulating pump 23 and a heat pump system are disposed at the bottom of the liner. One side of the dish washer is provided with a water softening device. The heat pump system includes:

An evaporator 30 and a compressor 33,

The sleeve heat exchange device 32 comprises sleeves, and different sleeves are sequentially communicated through a first connecting structure to form a water flow channel; the evaporator 30, compressor 33 and double pipe heat exchanger 32 are disposed around the sump 22 and on different sides of the sump, respectively.

The heat pump system is arranged in the bottom space of the housing of the dishwasher. The heat pump system comprises a compressor 33, a condenser (double pipe heat exchanger 32), a throttle device (not shown), an evaporator and a drier-filter 34. During washing, tap water is softened by the water softening device through the water inlet valve and then enters the dish washing machine. The circulating pump drives water to wash tableware through the sprayer. When the washing water is required to be heated, the circulating pump drives the water to pass through the condenser, and then the tableware is washed by the sprayer. The compressor operates, the pressure of the refrigerant entering the evaporator through the throttling device is reduced, the saturation temperature is reduced, the refrigerant is evaporated below the outside, a temperature difference is formed between the refrigerant and the outside air, and the heat of the energy storage substances is absorbed. The refrigerant in the evaporator is gasified, sucked and compressed by the compressor, the pressure is increased, the saturated temperature is increased, the refrigerant is condensed in the condenser at a state higher than the ambient temperature, heat is released, washing water in a water flow channel coaxial with the refrigerant in the condenser absorbs the heat released in the condenser, and the temperature is increased, so that the washing water can be increased in temperature due to the heat absorption every time the washing water passes through the condenser until the heating temperature is reached or the compressor reaches the maximum load, and the operation is stopped. The flow direction of the refrigerant in the heat pump system is as follows: the compressor, the condenser, the dry filter, the throttling device and the evaporator are returned to the compressor. For good heating effect, the direction of water flow and the direction of refrigerant flow are preferably reversed.

In order to ensure the heating effect under different conditions, the dishwasher of the invention can be provided with other heating modules 26 for heating the washing water. The dishwasher can heat the washing water by adopting a heat pump system or a heating module, and can heat the washing water by adopting a mode of combining the heat pump system and the heating module.

In order to facilitate maintenance and cleaning, the sleeve heat exchange device of the embodiment may include a sleeve, where a detachable first connection structure is provided at a water inlet end and/or a water outlet end of the sleeve; or a plurality of sleeves, different sleeves are sequentially communicated through a detachable first connecting structure, so as to form a water flow channel. The first connecting structure is an elbow.

The first connecting structure between the sleeves adopts a detachable connection mode, a user or a maintainer can clean the foreign matters entering along with the washing water inside each sleeve at any time in a mode of detaching the connecting part, so that the sleeve is convenient to maintain, the sleeve is prevented from being blocked, and the service life of the sleeve heat exchange device can be prolonged.

In order to achieve a better heat exchange effect, the sleeve heat exchange device comprises a plurality of sleeves, wherein central axes of the plurality of sleeves are arranged in parallel; preferably, the sleeve heat exchange device further comprises a positioning structure, wherein the positioning structure is connected with each sleeve, and the sleeves are positioned and kept at a certain interval through the positioning structure.

In this embodiment, the central axes of the plurality of bushings are arranged parallel to each other, and the central axes of the plurality of bushings are arranged parallel to the width direction of the door body 21. In this way, providing the double pipe heat exchanging device 32 in a direction parallel or substantially parallel to the width of the dishwasher may further save space, while also facilitating communication of the double pipe heat exchanging device 32 with the sump 22 and the circulation pump 23, respectively.

The sleeve heat exchange device 32 is provided with a water inlet and a water outlet of the water flow channel, the water inlet and the water outlet are positioned at two ends of the sleeve, one end of the sleeve provided with the water inlet is close to the water tank 22, and one end of the sleeve provided with the water outlet of the water flow channel is close to the circulating pump 23. The sleeve heat exchange device in the embodiment adopts the sleeve heat exchange device in the first embodiment, and the sleeve heat exchange device can be installed in a mode of the second embodiment, so that water in the sleeve can flow back conveniently.

The evaporator 30, the compressor 33 and the double pipe heat exchanging device 32 of the embodiment are arranged around the water tank 33 and are respectively positioned at different sides of the water tank, so that the arrangement is reasonable, the arrangement is compact, the installation is convenient, and more effective washing spaces are provided for the dish washing machine.

In this embodiment, the evaporator 30 and the double pipe heat exchanger 32 are disposed on opposite sides of the water tank 22. Thus, the fan 31 is convenient to install, a linear air path is formed, resources are saved, and the space is also saved.

With reference to the water tank 22, the direction of the water tank 22 toward the door 21 is defined as the front side of the water tank 22, and the double pipe heat exchanger 32 is disposed between the side of the water tank 22 toward the door 21 and the housing, that is, the double pipe heat exchanger 32 is disposed on the front side of the water tank 22.

The double pipe heat exchange device 32 comprises a plurality of double pipes, each double pipe comprises an outer pipe and an inner pipe, the inner pipes are arranged inside the outer pipe, the end parts of the inner pipes extend out of the outer pipe, and the inner pipes of different double pipes are sequentially communicated through a first connecting structure. The first connecting structure is an elbow, two ends of the elbow are respectively connected with the end parts of the inner tubes of the two sleeves, and a detachable bending part is formed between the two sleeves. So, the junction that easily stores up the foreign matter in the sleeve pipe 1 then can be easy dismantles and washs, and user or maintenance personal can clear up the inside foreign matter that gets into along with the wash water of each sleeve pipe 1 at any time through dismantling adapting unit's mode, and convenient maintenance avoids blocking up in the sleeve pipe 1, can prolong sleeve pipe heat transfer device 32's life.

The end part of the outer tube is in closed connection with the outer wall of the inner tube; the side part of the outer tube of one sleeve is provided with a refrigerating medium inlet and a refrigerating medium outlet, or the outer tubes of a plurality of sleeves are sequentially communicated through a second connecting structure to form a refrigerating medium channel. The second connection structure be the connecting pipe, the both ends of connecting pipe respectively with two sheathed tube outer tube lateral walls intercommunication, the region between the inner tube of many sheathed tubes and the outer tube communicates in proper order.

With reference to the water tank 22, a direction in which the water tank 22 is away from the door 21 is defined as a rear side of the water tank 22. The evaporator 30 is arranged between the side of the water trough 22 facing away from the door body 21 and the side wall of the housing. That is, the evaporator 30 is disposed at the rear side of the sump 22.

As a preferable embodiment, the evaporator 30 is a fin type evaporator, and a central axis of the fin type evaporator is parallel to a width direction of the side wall of the housing. That is, the fin type evaporator 30 is disposed in a direction parallel or substantially parallel to the width of the dishwasher. Thus, the evaporator 30 and the double pipe heat exchanging device 32 (condenser) are disposed relatively in parallel or substantially parallel to the width direction of the dishwasher, respectively, with a long distance therebetween, good heat absorbing and releasing effects, small occupied space, convenient reduction of the overall volume of the dishwasher, and ensured effective washing volume.

With reference to the water tank 22, the circulation pump 23 is provided on the left side of the water tank 22, with the side of the water tank 22 near the water softener being defined as the left side.

With reference to the water tank 22, the side of the water tank 22 facing away from the water softening device is defined as the right side, and the compressor 33 is provided on the right side of the water tank 22.

In this embodiment, the evaporator 30, the compressor 33 and the double-pipe heat exchange device 32 are distributed around the water tank 22 in a U shape, the evaporator 30 and the double-pipe heat exchange device 32 are disposed on two opposite sides of the water tank 22, and the compressor 33 is disposed at a bent portion of the U shape and opposite to the opening of the U shape. The heat pump system can form a passage of the heat pump system and save occupied space.

The circulating pump 23 is arranged at the opening of the U-shaped, the liquid inlet of the circulating pump 23 is communicated with the water outlet of the sleeve heat exchange device 32, the liquid outlet of the circulating pump 23 is connected with the water dividing valve 25 of the dish washer, the circulating pump 23 works during operation, negative pressure is formed at the water inlet of the circulating pump 23, washing water enters the sleeve from the water tank 22 to exchange heat with refrigerant, and after being heated, the washing water enters the circulating pump 23 to be pressurized, and is controlled to be conveyed to the corresponding spray arm to wash the dish washer by means of the water dividing valve 25. The water softening device is arranged at the opening of the U-shape and is close to the circulating pump 23, and the water softening device is communicated with the water tank 22. Preferably, the circulation pump 23 is arranged on the side of the water softening device facing the water tank 22.

Example IV

As shown in fig. 7 and 8, the present embodiment provides a dishwasher, which includes a housing 20, a door 2121 is disposed on one side of the housing 20, a liner of the dishwasher is disposed in the housing 20, a spray arm is disposed in the liner, and a water tank 2222, a circulating pump 2323 and a heat pump system are disposed at the bottom of the liner. One side of the dish washer is provided with a water softening device. The heat pump system includes:

the condenser comprises sleeves, and different sleeves are sequentially communicated through a first connecting structure to form a water flow channel;

The evaporator 30, the evaporator 30 and the condenser are oppositely arranged at two sides of the water tank 22;

a fan 31, the fan 31 driving air through the evaporator 30, the water tank 22 and the condenser.

In this embodiment, the condenser is the double pipe heat exchange device 32 described in the schemes of the first embodiment to the third embodiment, and the difference between this embodiment and the first embodiment to the third embodiment is that the dish washer of this embodiment is provided with the fan 31, and by adjusting the relative positions of the fan 31, the evaporator 30 and the condenser, the fan 31 can drive air to pass through the evaporator 30, the water tank 22 and the condenser, so that the air is uniformly distributed, the resource utilization rate is improved, and the energy is saved.

In this embodiment, the evaporator 30 and the condenser are disposed on two opposite sides of the water tank 22, and the fan 31 is disposed on one side of the evaporator 30 opposite to the water tank 22 and/or on one side of the evaporator 30 facing away from the water tank 22, so that the fan 31 can drive air to pass through the evaporator 30, the water tank 22 and the condenser by blowing or sucking air, thereby achieving the purposes of improving the resource utilization rate and saving energy.

In the present application, the blower 31 may be a blower or a suction blower. The blower 31 may be provided in one or more. The fan 31 may be a single-port fan or a multi-port fan, and can drive air to pass through the evaporator 30, the water tank 22 and the condenser.

In one aspect, the fan 31 is a suction fan, and the suction fan is disposed downstream of the evaporator 30 along the air flow direction.

The heat absorbed by the evaporator 30 is the heat of the air passing through the evaporator 30 by the fan 31. In the air flow direction, the fan is preferably in the downstream direction of the air flow relative to the evaporator 30, and the air passing through the evaporator 30 is distributed more uniformly by means of air suction of the fan, so that the utilization rate of resources is improved. When the fan 31 is a suction fan, the fan 31 is arranged in the following ways, but not limited to:

In case 1, the fan 31 is disposed between the evaporator 30 and the water tank 22, the air inlet of the fan 31 faces the evaporator 30, the air outlet of the fan 31 faces the water tank 22, and the outside air is discharged through the water tank 22 and the condenser after passing through the evaporator 30 and the fan 31.

In case 2, the fan 31 is disposed at one side of the evaporator 30 facing away from the water tank 22, the air inlet of the fan 31 faces the evaporator 30, the air outlet of the fan 31 faces the outside of the dishwasher, and the outside air is discharged after passing through the condenser, the water tank 22, the evaporator 30 and the fan 31 in sequence.

The blower 31 is disposed downstream in the air flow direction in a suction manner, and the driving air sequentially passes through the evaporator 30, the blower 31, the sump 22, and the condenser and then is discharged to the outside of the dishwasher, or the driving air sequentially passes through the condenser, the sump 22, the evaporator 30, and the blower 31 and then is discharged. Under the two conditions, the air suction fan 31 can enable air distribution to be more uniform, and drive air to linearly pass through the three parts of the condenser, the water tank 22 and the evaporator 30, so that the heat absorption requirement of the evaporator 30 and the heat dissipation requirement of the condenser are met, energy is saved, and the utilization rate is improved.

Scheme two, fan 31 is the hair-dryer, fan 31 sets up in the one side that evaporator 30 deviates from basin 22, and the air intake of fan 31 is towards the outside of dish washer, and the air outlet of fan 31 is towards evaporator 30, and the air discharges after evaporator 30, basin 22 and condenser in proper order.

When the fan 31 is a blower, the fan 31 is arranged on one side, away from the water tank 22, of the evaporator 30, so that air can be driven to be discharged after sequentially passing through the evaporator 30, the water tank 22 and the condenser, the heat absorption requirement of the evaporator 30 and the heat dissipation requirement of the condenser are met, and the purpose of saving energy is achieved.

In order to facilitate the installation of the components at the bottom of the dish washer, the bottom of the dish washer is also provided with a mounting seat, the middle part of the mounting seat is provided with a first mounting area for mounting the water tank 22, and two opposite sides of the first mounting area are respectively provided with a second mounting area and a third mounting area for mounting the evaporator 30 and the condenser. Thus, the evaporator 30 and condenser are disposed on opposite sides of the sump 22, such that the fan 31 drives air across the evaporator 30, sump 22 and condenser on one side of the evaporator 30.

In this embodiment, the water inlet of the condenser is communicated with the water tank 22 and is disposed between the side of the water tank 22 facing the door 21 and the housing, and the evaporator 30 is disposed between the side of the water tank 22 facing away from the door 21 and the side wall of the housing, so as to achieve the purpose of saving the occupied space.

The third installation area of the installation seat is positioned at one side, namely the front side, of the water tank 22 facing the door body 21; the second mounting area is located on the side of the water trough 22 facing away from the door body 21, i.e. the rear side. When the suction fan is disposed at a side of the evaporator 30 facing away from the water tank 22, i.e., at a rear side of the evaporator 30, the air flow direction is: outside air enters the mounting seat, passes through the condenser and the water tank 22, flows through the evaporator 30, is sucked into the fan 31 and is discharged to the rear of the mounting seat. When the blower 31 is disposed at a side of the evaporator 30 near the water tank 22, the air flow direction is: outside air enters the mounting seat from the rear part of the mounting seat, passes through the evaporator 30 and the fan 31, and is discharged to the front side of the mounting seat along the directions of the water tank 22 and the condenser.

The condenser in this embodiment is a double-pipe heat exchange device 32, which comprises a plurality of double-pipes, wherein central axes of the double-pipes are parallel to each other; the central axes of the plurality of bushings are arranged parallel to the width direction of the door body 21. Each sleeve comprises an outer tube and an inner tube, the inner tubes are arranged inside the outer tube, the end parts of the inner tubes extend out of the outer tube, and the inner tubes of different sleeves are sequentially communicated through a first connecting structure. The first connecting structure is an elbow, two ends of the elbow are respectively connected with the end parts of the inner tubes of the two sleeves, and a detachable bending part is formed between the two sleeves. So, the junction that easily stores up the foreign matter in the sleeve pipe then can be easy dismantles and washs, and user or maintenance personal can clear up the inside foreign matter that gets into along with the wash water of each sleeve pipe at any time through dismantling adapting unit's mode, and convenient maintenance avoids blocking up in the sleeve pipe, can prolong sleeve pipe heat transfer device 32's life.

The foregoing description is only illustrative of the preferred embodiment of the present invention, and is not to be construed as limiting the invention, but is to be construed as limiting the invention to any and all simple modifications, equivalent variations and adaptations of the embodiments described above, which are within the scope of the invention, may be made by those skilled in the art without departing from the scope of the invention.

Claims

1.A dishwasher, in which a water tank and a heat pump system are arranged, characterized in that the heat pump system comprises:

An evaporator and a compressor, wherein the evaporator and the compressor,

The sleeve heat exchange device comprises sleeves, and water inlet ends and/or water outlet ends of different sleeves are sequentially communicated through a first connecting structure to form a water flow channel;

The evaporator, the compressor and the sleeve heat exchange device are arranged around the water tank and are respectively positioned at different sides of the water tank;

The sleeve heat exchange device comprises a plurality of sleeves, different sleeves are sequentially communicated through a detachable first connecting structure, the first connecting structure comprises bent pipes, and central axes of the plurality of sleeves are mutually parallel;

The sleeve heat exchange device at least comprises a first sleeve, a second sleeve and a third sleeve, the third sleeve is positioned above the first sleeve, the circle center of the second sleeve is positioned on the central line of the connecting line of the circle centers of the cross sections of the first sleeve and the third sleeve, and the circle centers of the cross sections of the three sleeves form the vertex of an isosceles triangle;

the sleeve comprises an outer pipe and an inner pipe, the inner pipe is arranged in the outer pipe, the end part of the inner pipe extends out of the outer pipe, one end of the inner pipe of the second sleeve is communicated with the end part of the inner pipe of the first sleeve through a first connecting structure, the other end of the inner pipe of the second sleeve is communicated with the end part of the inner pipe of the third sleeve through a first connecting structure, and the free end parts of the inner pipes of the first sleeve and the third sleeve respectively form a water inlet and a water outlet, so that a water flow channel is formed;

One end of the outer tube of the second sleeve is communicated with the outer tube of the first sleeve through a second connecting structure, the other end of the outer tube of the second sleeve is communicated with the outer tube of the third sleeve through a second connecting structure, a refrigerating medium outlet is formed in the side wall of the outer tube, close to the water inlet, of the first sleeve, and a refrigerating medium inlet is formed in the side wall of the outer tube, close to the water outlet, of the third sleeve, so that a refrigerating medium channel is formed; the end part of the outer tube is in closed connection with the outer wall of the inner tube, and the direction of water flow is opposite to the flowing direction of the refrigerating medium.

2. A dishwasher as in claim 1, wherein,

The sleeve heat exchange device also comprises a positioning structure, wherein the positioning structure is connected with each sleeve, and the sleeves are positioned by the positioning structure and keep a certain distance.

3. A dishwasher according to claim 1 or 2, wherein the evaporator and the double-pipe heat exchanger are provided on opposite sides of the sump.

4. A dishwasher according to claim 3, wherein the dishwasher comprises a housing, a door is provided on one side of the housing, the sump is located at the bottom of the housing, and the double-pipe heat exchanger is in communication with the sump and is provided on the side of the sump facing the door.

5. The dishwasher of claim 4, wherein the central axes of the plurality of sleeves are disposed parallel to the width direction of the door body.

6. A dishwasher according to claim 4, wherein the evaporator is arranged on a side of the sump facing away from the door.

7. The dishwasher of claim 6 wherein the evaporator is a fin evaporator having a central axis disposed parallel to a width of the side wall of the housing.

8. A dishwasher according to claim 1 or 2, wherein the evaporator, the compressor and the double-pipe heat exchanger are arranged in a U-shape around the water tank, the evaporator and the double-pipe heat exchanger are arranged on opposite sides of the water tank, and the compressor is arranged at the bent part of the U-shape and opposite to the opening of the U-shape.

9. The dish washer of claim 8, further comprising a circulation pump in the dish washer, wherein the circulation pump is arranged at the opening of the U-shaped part, the liquid inlet of the circulation pump is communicated with the water outlet of the double-pipe heat exchange device, and the liquid outlet of the circulation pump is connected with the water diversion valve of the dish washer.

10. A dishwasher according to claim 9, further comprising a water softening device disposed at the U-shaped opening adjacent the circulation pump, the water softening device being in communication with the sump.

11. A dishwasher according to claim 10, wherein the circulation pump is arranged on the side of the water softening device facing the sump.

12. A dishwasher according to claim 1 or 2, characterized in that,

Two ends of the bent pipe are respectively connected with the end parts of the inner pipes of the two sleeves, and a detachable bending part is formed between the two sleeves.

13. The dishwasher of claim 12 wherein the second connection structure is a connection tube, two ends of the connection tube are respectively connected to the side walls of the outer tubes of the two sleeves, and the areas between the inner tubes and the outer tubes of the plurality of sleeves are sequentially connected.