Clothes washing and drying machine

Abstract

The invention relates to a clothes washing and drying machine which comprises a box body and a transversely-arranged barrel located in the box body, the barrel is provided with a side wall and a rear wall located at the rear end of the side wall, the barrel is connected with the two ends of an air channel through an air outlet and an air return opening respectively, and a first heat exchanger, a second heat exchanger and a blower device are located in the air channel. The air channel comprises a first section, a second section and a third section in the air flowing direction after the blower device is started, the first section extends from top to bottom, the second section extends from bottom to top, the first section and the second section are located between the rear wall of the barrel and the rear plate of the box body, and the third section is located between the first section and the second section. The first heat exchanger and the second heat exchanger are located in the second section. In this way, the limited space in the box body can be well utilized, and particularly the space on the rear portion of the barrel can be utilized for arranging the first heat exchanger and the second heat exchanger.

Description

[Technical field]

[0001] The present invention relates to the technical field of washing and drying machines, and in particular to an air heat exchange system of a washing and drying machine. [Background technology]

[0002] Washing machines and dryers generally add a dehumidification system based on a washing machine, but it is usually not desirable to change the size of the cabinet, so there are challenges in the use of space.

[0003] Especially for heat pump washing and drying machines, the heat pump dehumidification system has many components and is large in size, so it is necessary to make more rational use of the space in the cabinet. The layout design of each component is particularly important.

[0004] In addition, the layout of the dehumidification system must also take into account the prevention of adverse effects of washing water and washing foam on functional components during the washing program.

[0005] Lint is easily generated during the drying process. In order to avoid blocking the air passage or covering the surface of the heat exchanger, it is necessary to block and / or clean it in time. If a large amount of lint accumulates after long-term use, it is also necessary to be able to clean it manually, for example, to facilitate users or after-sales service personnel to approach the lint accumulation area and clean it. Currently known washing and drying machines also have room for improvement in this regard. [Summary of the invention]

[0006] An object of the present invention is to provide an improved washing and drying machine.

[0007] One aspect of the present invention discloses a washing and drying machine, comprising a box body, a barrel arranged transversely in the box body, the barrel having side walls and a rear wall located at the rear end of the side walls, the barrel being connected to two ends of an air passage respectively through an air outlet and a return air outlet, a first heat exchanger, a second heat exchanger, and a blowing device being located in the air passage, wherein the first heat exchanger dehumidifies air from the barrel, and the second heat exchanger heats the dehumidified air, and along the air flow direction after the blowing device is turned on, the air passage comprises a first section, a second section, and a third section, wherein the first section is connected to the air outlet of the barrel, the air outlet is located at the upper part of the barrel, the first section extends from top to bottom, the second section extends from bottom to top, the first section and the second section are located between the rear wall of the barrel and the rear plate of the box body, the third section extends axially from back to front along the side wall of the barrel, and is basically located between the barrel and the top plate of the box body, and the first heat exchanger and the second heat exchanger are located in the second section.

[0008] The barrel is arranged horizontally, which can be understood as the axis of the barrel being horizontal or tilted upward at a certain angle relative to the horizontal.

[0009] Part of the air channel is arranged in the space at the rear of the barrel, and the other part is arranged in the space at the upper part of the barrel, so that the limited space can be better utilized, especially the space at the rear of the barrel can be used to arrange the first heat exchanger and the second heat exchanger. The air outlet is located at the upper part of the barrel, especially at a position as high as possible on the barrel, close to the top of the barrel, so as to avoid or reduce the washing water or foam from entering the air channel during the washing process. Even if some water or foam enters the air channel, since there is no heat exchanger in the first section, the water or foam flows to the bottom between the first section and the second section after passing through the first section, and will not affect the heat exchanger. In addition, during the drying process, the humid air from the barrel first passes through the first section of the air channel, changes direction after turning, and enters the second section to exchange heat with the heat exchanger. The air passes through a long path before contacting the heat exchanger, and a part of the pre-condensation occurs. At the same time, turbulence occurs during the flow of the air, which is conducive to fully and evenly exchanging heat with the heat exchanger.

[0010] An optional embodiment also includes: a transition section in an arc structure connects the first section and the second section and is located at the bottom of the air channel in the gravity direction, and a drainage outlet is provided at the bottom of the transition section.

[0011] Optional embodiments include: the drain port is connected to the upper part of the barrel or other water receiving devices through a drain pipe, and a first drain device is provided on the drain pipe. The upper part of the barrel should be selected as high as possible, and other water receiving devices may be, for example, a water storage tank, a feed box, etc. The first drain device is implemented as a water pump, for example. In this way, the water generated or injected into the air channel can be collected and discharged through the drain port. During the washing process, if water or foam overflows into the air channel through the air outlet of the barrel, the first drain device can be opened to continuously discharge the overflowing water or foam to prevent the first heat exchanger and the second heat exchanger from being soaked.

[0012] An optional embodiment includes: the outlet of the drainage pipe is higher than the bottom of the air outlet.

[0013] An optional embodiment includes: the bottom of the barrel is connected to a second drainage device for draining water to the outside, the drainage port is connected to the second drainage device through a drainage pipe, and the drainage pipe is provided with a valve that is closed during the period when the barrel is filled with water. The second drainage device can be used to drain the washing water during the washing process. During the washing process, especially when the barrel is filled with water, the valve is closed to prevent the water in the barrel from flowing back into the air channel. When it is necessary to drain the air channel, the valve is opened and the second drainage device is activated to drain the water in the air channel.

[0014] Optional embodiments include: the first heat exchanger is located below the second heat exchanger, and the windward side of the first heat exchanger is located at the bottom of the first heat exchanger, and the first spray device is configured to spray water to the windward side of the first heat exchanger. In this way, not only can the fluff attached to the windward side of the first heat exchanger be washed away, but the water after washing leaves the first heat exchanger under the action of gravity, and will not cause the washed fluff to accumulate near the heat exchanger. In addition, the water can exchange heat with the air during the downward flow, which plays a role of pre-condensation.

[0015] An optional embodiment includes: the filter screen is arranged below the first heat exchanger and is located within the spraying range of the first spray device, so that the first spray device can simultaneously wash the first heat exchanger and the fluff on the filter screen after it is turned on.

[0016] An optional embodiment includes: the first section, the transition section, and the second section include an integrally formed base and an integrally formed cover, and the cover is located on a side close to the rear plate of the box body.

[0017] An optional embodiment includes: a first heat exchanger, a second heat exchanger, a compressor and a throttle are connected to form a heat pump circuit.

[0018] An optional embodiment includes: a filter is arranged in the air channel and is located between the air outlet of the barrel and the first heat exchanger, and a second spraying device is arranged to spray water onto the filter.

[0019] An optional embodiment includes: the filter is arranged on the transition section connecting the first section and the second section, and the air flow direction changes from downward to upward in the transition section. The air is turbulent in the transition section, which can better capture the fluff. At the same time, the air after passing through the filter is further turbulent, and contacts the first heat exchanger after a shorter path, so as to better perform heat exchange.

[0020] An optional embodiment includes: the filter screen is located on the lowest cross-section of the transition section.

[0021] An optional embodiment includes: a drain port is provided at the bottom of the transition section, and the lower portion of the filter screen is close to the drain port.

[0022] Flushed lint can be discharged from the air passage over a shorter distance.

[0023] An optional embodiment includes: a water trough is provided at the bottom of the transition section, the drain port is communicated with the water trough, and the lower part of the filter screen is located above the water trough or extends downward into the water trough.

[0024] An optional embodiment includes: a portion of the second spray device is directed toward the filter screen, and another portion is directed toward the water tank.

[0025] An optional embodiment includes: the filter is detachably mounted on the air passage.

[0026] An optional embodiment includes: a slot is provided on the wall of the air passage, and the filter is detachably installed in the slot.

[0027] An optional embodiment includes: comprising a control device, which is configured to control the washing and drying machine to run a drying program, and in the drying program, the water supply device can be started to supply water to the first spray device and / or the second spray device. In the drying program, the first spray device and / or the second spray device sprays water into the air channel, which not only washes the lint, but also plays a role of pre-condensation.

[0028] An optional embodiment includes: a bracket is mounted on the rear flange of the side panel of the box body, and the first section and the second section of the air channel are fixed on the bracket and are located between the bracket and the rear panel.

[0029] An optional embodiment includes: the bracket includes a crossbeam respectively connecting the left and right side panels, and the first section and the second section of the air channel are fixed on the crossbeam.

[0030] An optional embodiment includes: the bracket is concave inwardly, so that a space for installing the first section and the second section of the air channel is reserved between the bracket and the rear plate.

[0031] An optional embodiment includes: the first section and the second section include an integrally formed base and an integrally formed cover, the base is fixed to the bracket, and the cover is located on a side close to the rear plate of the box. When the filter or heat exchanger needs to be cleaned or repaired, the rear plate of the box is opened, and then the cover is opened to expose the heat exchanger and the filter, which is relatively easy to operate.

[0032] If technical conditions permit, the above embodiments may be combined in any manner.

[0033] Some specific embodiments of the present invention will be described below with reference to the accompanying drawings. Other advantages of the present invention will also be described below with reference to various specific embodiments.

Brief Description of the Drawings

[0034] Figure 1 A side view of a washer-dryer with some parts cut away.

[0035] Figure 2 A rear view of the washer-dryer with the rear panel removed.

[0036] Figure 3 An exploded view of a washing and drying machine.

[0037] Figure 4 This is an exploded view of some components of a washing and drying machine.

[0038] Figure 5 A schematic diagram of a part of the air channel. [Specific embodiment]

[0039] In order to make the technical problems, technical solutions and beneficial technical effects to be solved by the present invention clearer, the present invention will be further described in detail in conjunction with the accompanying drawings and multiple exemplary embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the scope of protection of the present invention, and each embodiment may share the same view or multiple views for description, but all features appearing in the same figure cannot be interpreted as features that must be possessed by an embodiment. On the contrary, as long as they are not mutually exclusive technically, they can be combined in any suitable manner. Moreover, for the sake of simplicity, different embodiments of different aspects may be presented in the same specific design, but such presentation does not mean that the embodiments of these aspects should appear together. The disassembly and / or combination of all possible embodiments and / or technical features should also take into account the description of the specification and the content that can be directly and unambiguously determined by those skilled in the art based on the description of the specification.

[0040] like Figure 1-Figure 5 As shown, the washing and drying machine 100 includes a housing 1. A horizontally arranged barrel 2 is provided in the housing 1. The horizontal arrangement refers to a vertical arrangement relative to the ground, which can be understood as the axis of the barrel 2 being horizontal or inclined relative to the horizontal. The barrel 2 has a side wall 21 and a rear wall 22 located at the rear end of the side wall 21. The barrel 2 is a roughly cylindrical structure, so the side wall 21 refers to the side of a roughly cylindrical structure. The "rear" here and the "rear" in the context are relative to the front side of the washing and drying machine 100, referring to the side that is farther away from the user relative to the "front" side.

[0041] The barrel 2 is connected to both ends of the air channel 3 through the air outlet 23 and the return air outlet 24 respectively. The first heat exchanger 4, the second heat exchanger 5, and the blower 6 are located in the air channel 3. Therefore, after the blower 6 is turned on, an air circulation loop is formed in the barrel 2 and the air channel 3. The first heat exchanger 4 dehumidifies the air from the barrel 2, and the second heat exchanger 5 heats the dehumidified air. The heated air enters the barrel 2 again to heat and evaporate the moisture in the clothes in the barrel. The air outlet 23 is located at a position as high as possible on the upper part of the barrel 2. For example, near the top of the rear wall 22 shown in the figure. The return air outlet 24 can be located at a higher position on the upper part of the barrel 2, or as shown in the figure. Figure 1 On the door seal 25 connected to the barrel 2 as shown.

[0042] Along the air flow direction after the blower 6 is turned on, the air channel 3 includes a first section 31, a second section 32, and a third section 33. The first section 31 is connected to the air outlet 23 of the barrel 2 and extends from top to bottom. The second section 32 changes the air flow direction and extends from bottom to top. The first section 31 and the second section 32 are located between the rear wall 22 of the barrel 2 and the rear plate 11 of the box body 1. The first section 31 and the second section 32 are basically flat plates, roughly parallel to the rear plate 11 or the rear wall 22. Figure 1 As shown, the first section 31 and the second section 32 are fixedly mounted on the box body 1 close to the rear plate 11 .

[0043] Specifically, Figure 2 As shown, the bracket 7 is mounted on the rear flange 120 of the side plate 12 of the box body 1. The first section 31 and the second section 32 of the air channel 3 are fixed on the bracket 7 and are located between the bracket 7 and the rear plate 11.

[0044] The bracket 7 includes a crossbeam 71 respectively connected to the left and right side panels 12. Specifically, both ends of the crossbeam 71 are respectively fixed to the rear flanges 120 of the left and right side panels. The first section 31 and the second section 32 of the air channel 3 are fixed to the crossbeam 71.

[0045] Advantageously, the bracket 7 is concave inwards, that is, concave towards the tub 2 , so that a space for installing the first section 31 and the second section 32 of the air passage 3 is reserved between the bracket 7 and the rear plate 11 . Figure 2 In the illustrated embodiment, the middle portion of the cross beam 71 is recessed to facilitate installation of the first section 31 and the second section 32 of the air passage 3 .

[0046] The first section 31 and the second section 32 include an integrally formed base 30 and an integrally formed cover 40. Therefore, the first section 31 and the second section 32 are an integral structure, which is convenient for production and installation. The base 30 is fixed on the bracket 7. The cover 40 is located on one side of the rear plate 11 close to the box body 1.

[0047] The first heat exchanger 4 and the second heat exchanger 5 are located in the second section 32. And along the flow direction of air, the first heat exchanger 4 is located upstream of the second heat exchanger 5. The positional relationship between the first heat exchanger 4 and the second heat exchanger 5 is that the first heat exchanger 4 is located below the second heat exchanger 5.

[0048] The first heat exchanger 4, the second heat exchanger 5, the compressor 8 and the throttle 9 are connected to form a heat pump circuit. The compressor 8 is arranged below the tub 2. In the width direction of the washing and drying machine 1, it is closer to the second section 32 than the first section 31 of the air channel 3, and therefore is also closer to the first heat exchanger 4 and the second heat exchanger 5.

[0049] The third section 33 of the air passage 3 axially extends from the rear to the front along the side wall 21 of the tub 2 and is substantially located between the tub 2 and the top plate 13 of the box body 1 . The air blowing device 6 is disposed in the third section 33 .

[0050] In the width direction of the washing and drying machine 1, the first section 31 of the air channel 3 is located on one side, and the second section 32 is located on the other side. The two are arranged in parallel, and each of them extends substantially in the height direction as a whole. The first section 31 is an arc structure from top to bottom. The second section 32 is roughly straight from bottom to top, so as to facilitate the arrangement of the first heat exchanger 4 and the second heat exchanger 5. The width of the second section 32 exceeds 1 / 3 of the width of the washing and drying machine. The transition section 34 with an arc structure connects the first section 31 and the second section 32, and is located at the bottom of the air channel 3 in the gravity direction. The flow direction of the air changes from downward to upward in the transition section 34. Therefore, the first section 31, the transition section 34, and the second section 32 are roughly formed into a U-shaped structure. The base 30 and the cover 40 respectively include the transition section 34.

[0051] A drain port 35 is provided at the bottom of the transition section 34. In some embodiments, a water tank 36 is provided at the bottom of the transition section 34 to temporarily store part of the water from the air channel 3. The drain port 35 is communicated with the water tank 36, for example, disposed near the bottom of the water tank 36.

[0052] In some embodiments, the drain port 35 is connected to the upper part of the tub 2 or other water receiving devices through a drain pipe 37. A first drain device 38 is provided on the drain pipe 37. Preferably, if the drain pipe 37 is connected to the tub 2, the outlet of the drain pipe 37 is higher than the bottom of the air outlet 23 of the tub 2. Another water receiving device may be a feed box 41 that is connected to the tub 2 and is used to add detergent to the tub 2 during the washing process. The feed box 41 is usually located higher than the tub 2. Another water receiving device may also be a water storage tank 42, such as Figure 4 The water storage tank can be used to temporarily store water, and the water therein can be used for other purposes, such as washing clothes, washing lint from functional components, generating steam, etc. The first drainage device 38 is implemented as a water pump, for example.

[0053] During the drying process, the first heat exchanger 4 condenses the moisture in the air. The condensed water flows into the water tank 36 along the wall of the air channel 3. The first drainage device 38 can be opened to drain the condensed water into the tub 2 or other water receiving device. Moreover, during the washing process, if the washing water or foam overflows into the air channel 3 through the air outlet 23 of the tub 2, the first drainage device 38 can be opened to drain the overflowed water.

[0054] The bottom of the bucket 2 is connected to a second drainage device 39 for draining water to the outside. In other embodiments, such as Figure 2 and Figure 3As shown, the drain port 35 is connected to the second drain device 39 through a drain pipe 37. In order to prevent water from flowing back into the air channel 3, a valve 43 is provided on the drain pipe 37, which is closed during the period when the tub 2 is filled with water. Thus, condensed water generated during the drying process can be discharged through the second drain device 39. The second drain device 39 is implemented as a water pump.

[0055] The first heat exchanger 4 is located below the second heat exchanger 5, and the windward side 401 of the first heat exchanger 4 is located at the bottom of the first heat exchanger 4 and faces downward. After the air carrying moisture and lint from the barrel 2 passes through the first section 31 and the transition section 34 of the air channel 3, it first contacts the windward side 401 of the first heat exchanger 4 head-on. After being blocked, the lint in the air adheres more to the first heat exchanger 4, especially to the windward side 401. Therefore, the preferred embodiment also includes a first spraying device 101 provided on the air channel 3 to spray water to the windward side 401 of the first heat exchanger 4.

[0056] The first spray device 101 includes a first water distributor 102 and a first water pipe 103 that supplies water to the first water distributor 102. A water supply device 400 connects the first water pipe 103 to a water source. The water source may be a public water network or water stored inside the machine. The water supply device 400 is implemented as a water valve. The first water distributor 102 spans the location of the first heat exchanger 4 and is close to the windward side 401 of the first heat exchanger 4. Figure 4 As shown, the first water distributor 102 includes a first flow distribution area 105 with densely distributed small holes formed on the cover 40 and a first flow guide cover 106 covering the first flow distribution area 105. After the water enters the first water distributor 102 from the first water pipe 103, it flows along the first flow guide cover 106 and sprays toward the windward side 401 of the first heat exchanger 4 through the small holes of the first flow distribution area 105, thereby flushing the fluff on the windward side 401 of the first heat exchanger 4. The water that has finished flushing the first heat exchanger 4 falls downward from the bottom of the first heat exchanger 4 and falls to the bottom of the transition section 34 of the air channel 3 in a waterfall state. In the process of dripping, the water can also take away the fluff in the air and condense the air.

[0057] Since the lint shed from the clothes during the drying process will enter the air passage 3 with the air in large quantities, in order to better capture and remove the lint, a filter 10 is provided in the air passage 3. The filter 10 is preferably provided upstream of the first heat exchanger 4, so as to block and reduce the lint reaching the first heat exchanger 4. Therefore, the filter 10 is preferably provided between the air outlet 23 of the tub 2 and the first heat exchanger 4. The second spray device 201 is configured to spray water onto the filter 10, so as to rinse the lint collected on the filter 10. The water carries the lint and is discharged from the drain port 35.

[0058] like Figure 4 and Figure 5In the illustrated embodiment, the filter screen 10 is disposed on the transition section 34, and in particular, the filter screen 10 can be disposed on the lowest section of the transition section 34. The lower portion of the filter screen 10 is close to the drain port 35. The fluff washed down by the spray water can be directly discharged from the drain port 35, reducing adhesion on the flow path.

[0059] For the embodiment in which the transition section 34 is provided with a water groove 36 , the lower portion of the filter screen 10 is located above the water groove 36 or extends downward into the water groove 36 .

[0060] The second spray device 201 includes a second water distributor 202 and a second water pipe 203 that supplies water to the second water distributor 202. The water supply device 400 connects the second water pipe 203 to a water source. The second water distributor 202 is arranged parallel to the filter screen 10. The structure of the second water distributor 202 may be similar to that of the first water distributor 102, and may be referred to Figure 4 , no further description is given in text.

[0061] When the filter screen 10 is located above the water tank 36 or extends downward into the water tank 36, the second spray device 201 can be configured with one part facing the filter screen 10 and the other part facing the water tank 36. For example, the upper part of the second water distributor 202 sprays water toward the filter screen 10, and the lower part passes through the filter screen into the water tank 36 and sprays toward the water tank, so that the filter screen 10 and the water tank 30 can be washed at the same time to prevent the lint in the water tank 30 from accumulating and blocking the drain port 35.

[0062] In another embodiment, the filter screen 10 is disposed below the first heat exchanger 4 and is located within the spraying range of the first spray device 101. In this case, the second spray device 201 may not be specifically provided for the filter screen 10. The water after the first spray device 101 flushes the first heat exchanger 4 can flush the filter screen 10. Even so, it is not excluded to specifically provide the second spray device 201 for the filter screen 10. In this way, the filter screen 10 can be doubly flushed by the first spray device 101 and the second spray device 201.

[0063] In some embodiments, the filter 10 is detachably mounted on the air passage 3. This allows the user or after-sales service personnel to remove the filter 10 for thorough cleaning. In particular, the structure provides convenience for manual cleaning of the filter 10: the filter 10 can be exposed by simply opening the rear panel 11 of the housing 1 and the cover 40 of the air passage 3.

[0064] One embodiment of the detachable installation of the filter screen 10 may be: Figure 4 and Figure 5As shown, a slot 301 is provided on the wall of the air passage 3, and the filter 10 is detachably mounted in the slot 301. In particular, the slot 301 is formed on the base 30. The opening of the slot 301 faces the cover 40, so that when the cover 40 is not mounted on the base 30, or after the cover 40 is removed from the base 30, the filter 10 can be slidably inserted into the slot 301 or removed from the slot 301. The slot 301 can be substantially vertical relative to the bottom of the base 30, so the filter 10 is also substantially vertical relative to the bottom of the base 30 after being inserted.

[0065] The washer-dryer 100 includes a control device 200, which is configured to control the washer-dryer 100 to run a drying program and / or a washing program according to user selection. In the drying program, the water supply device 400 can be started to supply water to the first spray device 101 and / or the second spray device 201. The water supply device 400 can supply water to the first spray device 101 alone, or to the second spray device 201 alone, and does not necessarily supply water to the first spray device 101 and the second spray device 201 at the same time. However, it is not excluded that the water supply device 400 supplies water to the first spray device 101 and / or the second spray device 201 in the washing program. In particular, when the drain port 35 of the air channel 3 is connected to the barrel 2 or the feed box 41, the water after spraying can finally return to the barrel 2 to participate in washing, or be discharged by the second drain device 39 at the bottom of the barrel 2.

[0066] The various specific embodiments described above and shown in the drawings are only used to illustrate the present invention. Within the scope of the basic technical concept of the present invention, any form of changes made by ordinary technicians in the relevant technical field to the present invention are within the protection scope of the present invention.

Claims

1. A washing and drying machine, comprising a box (1), a barrel (2) disposed transversely in the box, the barrel having a side wall (21) and a rear wall (22) located at the rear end of the side wall, the barrel being connected to two ends of an air passage (3) through an air outlet (23) and an air return outlet (24), respectively, a first heat exchanger (4), a second heat exchanger (5), and an air blowing device (6) being located in the air passage, wherein the first heat exchanger dehumidifies air from the barrel, and the second heat exchanger heats the dehumidified air, Features: Along the air flow direction after the blowing device is turned on, the air channel includes a first section (31), a second section (32), and a third section (33), wherein the first section is connected to the air outlet of the barrel, and the air outlet is located at the upper part of the barrel, the first section extends from top to bottom, and the second section extends from bottom to top, the first section and the second section are located between the rear wall (22) of the barrel and the rear plate (11) of the box body, the third section extends axially from back to front along the side wall of the barrel, and is basically located between the barrel and the top plate (13) of the box body, and the first heat exchanger and the second heat exchanger are located in the second section.

2. The washing and drying machine according to claim 1, Features: A transition section (34) having an arc structure connects the first section (31) and the second section (32) and is located at the bottom of the air passage (3) in the gravity direction. A drainage outlet (35) is provided at the bottom of the transition section.

3. The washing and drying machine according to claim 2, Features: The drainage port (35) is connected to the upper part of the bucket (2) or other water receiving devices through a drainage pipe (37), and a first drainage device (38) is provided on the drainage pipe.

4. The washing and drying machine according to claim 3, Features: The outlet of the drainage pipe (37) is higher than the bottom of the air outlet (23).

5. The washing and drying machine according to claim 2, Features: The bottom of the barrel (2) is connected to a second drainage device (39) for draining water to the outside, and the drainage port (35) is connected to the second drainage device through a drainage pipe (37). The drainage pipe is provided with a valve (43) that is closed when the barrel is filled with water.

6. The washing and drying machine according to claim 2, Features: The first heat exchanger (4) is located below the second heat exchanger (5), and the windward side (401) of the first heat exchanger is located at the bottom of the first heat exchanger, and the first spraying device (101) is configured to spray water onto the windward side of the first heat exchanger.

7. The washing and drying machine according to claim 6, Features: The filter screen (10) is arranged below the first heat exchanger (4) and is located within the spraying range of the first spraying device (101).

8. The washing and drying machine according to claim 2, Features: The first section (31), the transition section (34), and the second section (32) comprise an integrally formed base (30) and an integrally formed cover (40), wherein the cover is located on a side close to the rear plate (11) of the box body (1).

9. The washing and drying machine according to claim 1, Features: The first heat exchanger (4), the second heat exchanger (5), a compressor (8) and a throttle (9) are connected to form a heat pump circuit.

10. The washing and drying machine according to any one of claims 1 to 9, Features: The filter (10) is arranged in the air passage (3) and is located between the air outlet (23) of the barrel (2) and the first heat exchanger (4), and the second spraying device (201) is arranged to spray water onto the filter.

11. The washing and drying machine according to claim 10, Features: The filter screen (10) is arranged on a transition section (34) connecting the first section (31) and the second section (32), and the flow direction of air changes from downward to upward in the transition section.

12. The washing and drying machine according to claim 11, Features: The filter screen (10) is located on the lowest cross section of the transition section (34).

13. The washing and drying machine according to claim 11, Features: A drainage port (35) is provided at the bottom of the transition section (34), and the lower part of the filter screen (10) is close to the drainage port (35).

14. The washing and drying machine according to claim 13, Features: A water trough (36) is provided at the bottom of the transition section (34), the drain outlet (35) is communicated with the water trough (36), and the lower part of the filter screen (10) is located above the water trough or extends downward into the water trough.

15. The washing and drying machine according to claim 14, Features: A portion of the second spray device (201) is directed toward the filter screen (10), and another portion is directed toward the water tank (36).

16. The washing and drying machine according to claim 10, Features: The filter (10) is detachably mounted on the air passage (3).

17. The washing and drying machine according to claim 16, Features: A slot (301) is provided on the wall of the air passage (3), and the filter (10) is detachably mounted in the slot (301).

18. The washing and drying machine according to any one of claims 1 to 17, Features: It comprises a control device (200) which is configured to control the washing and drying machine to run a drying program, and in the drying program, the water supply device (400) can be started to supply water to the first spray device (101) and / or the second spray device (201).

19. The washing and drying machine according to claim 1, Features: The bracket (7) is mounted on the rear flange (120) of the side plate (12) of the box body, and the first section (31) and the second section (32) of the air passage (3) are fixed on the bracket (7) and are located between the bracket (7) and the rear plate (11).

20. The washing and drying machine according to claim 19, Features: The bracket (7) comprises a crossbeam (71) respectively connected to the left and right side plates (12), and the first section (31) and the second section (32) of the air passage are fixed on the crossbeam (71).

21. The washing and drying machine according to claim 19 or 20, Features: The bracket (7) is concave inwardly, thereby leaving a space between the bracket (7) and the rear plate (11) for installing the first section (31) and the second section (32) of the air passage.

22. The washing and drying machine according to claim 19, Features: The first section (31) and the second section (32) comprise an integrally formed base (30) and an integrally formed cover (40), wherein the base (30) is fixed on the bracket (7), and the cover (40) is located on a side close to the rear plate (11) of the box body.

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