CN214736781U - Exhaust device of washing and drying machine and washing and drying machine - Google Patents

Abstract

The utility model relates to an exhaust device of a washing and drying machine and the washing and drying machine, which are arranged on the inner wall or the outer wall of a shell of the washing and drying machine; comprises an air inlet, an exhaust channel and an exhaust port; the air inlet, the exhaust channel and the exhaust port form an exhaust passage; a blocking structure for blocking liquid is arranged in the exhaust passage; the air inlet guides the air exhausted by the washing and drying machine and having humidity difference with the outside into the exhaust channel, liquid in the air flows back after passing through the blocking structure, and the air is exhausted to the outside of the washing and drying machine from the exhaust port. The utility model guides the gas which is exhausted by the washing and drying machine and has humidity difference with the outside into the exhaust channel without increasing the volume of the washing and drying machine, so that the liquid in the gas flows back after passing through the blocking structure, and a small amount of liquid in the gas is prevented from flowing to the ground after being sprayed out along with the gas; and the inclined plane design of the first baffle in the blocking structure and the combined design of the first baffle and the second baffle can realize higher liquid blocking effect and backflow effect.

Description

Exhaust device of washing and drying machine and washing and drying machine

Technical Field

The utility model relates to a be used for clothing nursing technical field, concretely relates to exhaust apparatus and washing and drying machine of washing and drying machine.

Background

At present, the existing clothes drying device, such as a dryer and a washing and drying integrated machine, firstly, a condensing type circulating drying is adopted, the principle of the device is generally that air is heated by a heater and enters a drying drum, water on clothes is evaporated under the action of hot air to form humid hot air with the air, then the humid hot air enters a condenser, the humid hot air is condensed into condensed water and dry gas under the action of cooling media in the condenser, the dry gas enters the drum after passing through the heater for heating, and the purpose of drying the clothes is achieved after the circulation. And secondly, direct-discharge condensation is adopted, fresh air is introduced from the outside, and the fresh air is directly discharged out of the dryer after being dried. The direct-discharge drying method has large energy consumption; the gas after the stoving is mostly the gas of high temperature and high humidity, and the gas of high temperature and high humidity after will drying directly discharges to indoorly from the inner tube, can cause the humidity and the high temperature of room air, and the air of indoor too high humiture gets into the inner tube through the new trend wind channel again, causes the unable long-term assurance of air quality, easily causes the damage and the pollution of clothing stoving.

In other prior art, the air of high temperature humidity after the condensation discharges the clothing drying device outside after heat transfer device's cooling dehumidification, nevertheless gaseous after the condensation discharges after heat transfer device cooling dehumidification, still can't get rid of liquid in the gas completely.

Therefore, it is necessary to solve the above-mentioned technical problems.

SUMMERY OF THE UTILITY MODEL

To the weak point of prior art, the utility model aims to provide an exhaust apparatus and washing-drying machine of washing-drying machine.

The technical scheme of the utility model outlines as follows:

the utility model provides an exhaust device of a washing and drying machine, which is arranged on a shell of the washing and drying machine; comprises an air inlet, an exhaust channel and an exhaust port; the air inlet, the exhaust channel and the exhaust port form an exhaust passage; wherein a liquid-impeding barrier is provided along the path of the exhaust passage;

the air inlet guides the air which is exhausted by the washing and drying machine and has humidity difference with the outside into the exhaust channel, liquid in the air flows back after passing through the blocking structure, and the air is exhausted to the outside of the washing and drying machine from the exhaust port.

Furthermore, the blocking structure comprises a first baffle plate, a plurality of air holes are formed in the first baffle plate, and the air holes form the air exhaust port.

Further, the first baffle includes a first inclined surface and/or a second inclined surface along which liquid in the gas having a humidity difference with the outside flows back.

Further, stop the structure and still include at least one second baffle that sets up along exhaust passage extending direction, the intermediate position of second baffle is equipped with the stop part, the both ends of stop part are equipped with a plurality of bleeder vents.

Further, the blocking structure further includes a seal disposed at the exhaust port, the seal configured to open and close the exhaust port.

Furthermore, the flow path in the exhaust passage is nonlinear, so that the blocking effect on liquid in the exhaust gas is increased.

Furthermore, when the exhaust device is installed on the surface of the washing and drying machine shell, the exhaust port faces to the direction deviating from the ground, and liquid in the gas with humidity difference with the outside flows back under the action of gravity.

Further, the cross-sectional area of the exhaust port is larger than the cross-sectional area of the intake port.

Further, the cross-sectional area of the exhaust passage gradually increases in a direction from the intake port to the exhaust port.

Further, the exhaust passage includes a side wall, and a width of the side wall is gradually reduced from top to bottom.

Further, still include the installation department, the installation department is located the both sides of air inlet.

Further, the blocking structure further comprises a filter element, wherein the filter element is installed at the air inlet and used for filtering the gas entering the exhaust channel and blocking the liquid.

Correspondingly, the utility model discloses still provide a washing and drying machine, include as above arbitrary any washing and drying machine's exhaust apparatus.

Further, the exhaust device is installed behind the dehumidification system, and the air inlet of the exhaust device is installed at the air outlet of the dehumidification system;

the dehumidification system cools and dehumidifies the damp and hot air in the outer barrel of the washing and drying machine to form gas with humidity difference with the outside, and the gas is discharged to the exhaust device.

Compared with the prior art, the beneficial effects of the utility model reside in that: the utility model provides an exhaust apparatus of washing and drying machine, install at casing inner wall or outer wall, do not increase the volume of washing and drying machine, the gas that has the humidity difference with the external world that will wash the machine exhaust is guided to the exhaust passage in, make the liquid in the gas flow back after blockking the structure, discharge together with the comdenstion water that the inside clothing of washing and drying machine was dried and produced, prevent a small amount of liquid in the gas from flowing to ground after the gas blowout; and the inclined plane design of the first baffle in the blocking structure and the combined design of the first baffle and the second baffle can realize higher liquid blocking effect and backflow effect.

The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings. The detailed description of the present invention is given by the following examples and 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 application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:

FIG. 1 is an internal schematic view of an embodiment of a washer dryer of the present invention;

FIG. 2 is an internal schematic view of another embodiment of the washer dryer of the present invention;

fig. 3 is a schematic view of an exhaust device of a washing and drying machine according to the present invention;

fig. 4 is an exploded view of an exhaust device of a washing and drying machine according to the present invention;

fig. 5 is a schematic view of a blocking structure in an exhaust device of a washing and drying machine according to the present invention;

FIG. 6 is a cross-sectional view of an exhaust device of a washer dryer of the present invention;

fig. 7 is a schematic view of a heat exchange device in the washing and drying machine of the present invention.

Description of reference numerals:

100. a washing and drying machine; 1. a fresh air duct; 2. an air exhaust duct; 81. an inner barrel; 82. an outer cylinder; 4. a condenser; 5. a circulating air duct; 51. a heating assembly; 52. a fan volute; 6. connecting an air duct; 71. draining pump; 7. a drain pipe; 10. a heat exchange device; 11. an upper housing; 111. a cooling medium inlet; 1211. an upper fin; 1221. a lower fin; 123. a heat conducting plate; 13. a lower housing; 131. an air outlet; 132. an air inlet; 133. a cooling medium outlet; 20. an air inlet module; 30. an exhaust device; 31. an air inlet; 311. a filter member; 32. an exhaust port; 33. an exhaust passage; 34. a first baffle plate; 341. a first inclined surface; 342. a second inclined surface; 35. a second baffle; 351. a blocking portion.

Detailed Description

The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses a more detailed description of the present invention, which will enable those skilled in the art to make and use the present invention. In the drawings, the shape and size may be exaggerated for clarity, and the same reference numerals will be used throughout the drawings to designate the same or similar components. In the following description, terms such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, lower, and the like are used based on the orientation or positional relationship shown in the drawings. In particular, "height" corresponds to the dimension from top to bottom, "width" corresponds to the dimension from left to right, and "depth" corresponds to the dimension from front to back. These relative terms are for convenience of description and are not generally intended to require a particular orientation. Terms concerning attachments, coupling and the like (e.g., "connected" and "attached") refer to a relationship wherein structures are secured or attached, either directly or indirectly, to one another through intervening structures, as well as both movable or rigid attachments or relationships, unless expressly described otherwise.

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the following embodiments or technical features can be used to form a new embodiment without conflict. It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

Referring to fig. 1-7, the present invention provides an exhaust device 30 for a washing and drying machine, which is installed on the inner wall or outer wall of the casing of the washing and drying machine. Referring to the attached figure 1, the exhaust device 30 is installed on the outer wall of the shell, referring to the attached figure 2, the exhaust device 30 is installed on the inner wall of the shell, and liquid in the gas is prevented from flowing back before the gas is exhausted to the outside of the washer dryer. The exhaust device 30 includes an intake port 31, an exhaust passage 33, and an exhaust port 32; the intake port 31, the exhaust passage 33, and the exhaust port 32 form an exhaust passage; wherein a liquid blocking structure is arranged on the path along the exhaust passage; the air inlet 31 guides the air discharged by the washer dryer and having a humidity difference with the outside into the air discharge channel 33, the liquid in the air flows back after passing through the blocking structure, and the air is discharged to the outside of the washer dryer from the air outlet 32.

The exhaust device 30 is installed behind the dehumidification system, and the air inlet 31 of the exhaust device 30 is installed at the air outlet of the dehumidification system; the dehumidification system cools and dehumidifies the hot and humid air in the outer tub 82 of the washing and drying machine to form air having a humidity difference with the outside, and discharges the air to the exhaust device 30.

The washing and drying mode of the washing and drying machine in the prior art can be a condensing mode and/or a direct vent type, the condenser communicates the outer cylinder in the condensing mode and is used for condensing the hot and humid air entering the condenser through the outer cylinder, air circulation after condensation to the inner cylinder, water after condensation is discharged through the drain pipe, the drying time of the condensing mode has been shortened in subsequent direct vent type washing and drying mode, the hot and humid air in the washing and drying machine is discharged through the air duct of airing exhaust, the direct vent type can be combined with the condensing mode for use, the drying time is shortened, the outside new trend of washing and drying machine can also be introduced, the washing and drying machine is discharged through the hot and humid air simultaneously, the utility model provides an exhaust apparatus 30 installs on the air duct of airing exhaust of hot and humid air promptly for reduce or avoid the liquid blowout in the hot and humid air.

In addition, can also set up heat transfer device in the direct vent washes the stoving mode, the damp and hot air of interior outer tube is after the wind channel of airing exhaust advanced to go into the heat transfer device in cool off the dehumidification after, reentrant the utility model provides an after making the liquid backward flow in exhaust apparatus 30, gaseous from exhaust apparatus 30 blowout. Therefore, the present invention provides an exhaust apparatus 30 that can be installed after the heat exchange apparatus. It can be seen that, the utility model discloses well exhaust apparatus installs behind dehumidification system, and exhaust apparatus's air inlet is installed at dehumidification system's air outlet, and dehumidification system includes the wind channel and/or heat transfer device of airing exhaust with damp and hot air exhaust, and the air outlet can be the air outlet in the wind channel of airing exhaust, also can be heat transfer device's air outlet.

Specifically, referring to fig. 4 to 6, the blocking structure includes a first baffle 34, and a plurality of air holes are formed on the first baffle 34, and the air holes form the air outlet 32. The middle of the first baffle 34 is provided with a downward concave part, and a small amount of liquid carried in the sprayed gas passes through the first baffle 34, and then the liquid is blocked by the first baffle 34 and flows back downwards along the concave part. Specifically, the first baffle 34 includes a first inclined surface 341 and/or a second inclined surface 342, and an intermediate portion of the first baffle 34 is lower than the first inclined surface 341 and the second inclined surface 342 to form a downward concave portion, and the liquid in the exhaust gas flows back along the first inclined surface 341 and/or the second inclined surface 342.

In this embodiment, the blocking structure further includes at least one second baffle 35 disposed along the extending direction of the exhaust passage, a plurality of air holes are disposed on the second baffle 35, the second baffle 35 is located below the first baffle 34, and the exhaust gas passes through the first baffle 34 after passing through the second baffle 35. Specifically, a blocking part 351 is arranged in the middle of the second baffle 35, and a plurality of air holes are arranged at two ends of the blocking part 351; the liquid in the gas having a humidity difference with the outside flows back after being blocked by the blocking portion 351 at the middle position of the second blocking plate 35. There is the gas of humidity difference with the external world to be passed through second baffle 35 after being spout earlier, liquid in the gas is blockked the back backward flow by the stop part 351 that is located the intermediate position, gas is discharged from the bleeder vent, prevent effectively that exhaust gas from blowing off liquid, a plurality of bleeder vents (being gas vent 32) are discharged on the rethread first baffle 34, two-layer baffle design from top to bottom, the motion resistance that has the gas of humidity difference with the external world to a certain extent has been increased, can prevent that gas from blowing off water, and the exhaust gas passes through twice condensation in whole exhaust apparatus 30, the drainage pipe of dehumidification system is refluxed to the liquid of condensation, discharge along with dehumidification system's drainage pipe.

In addition, the blocking structure includes a seal disposed at the vent, the seal configured to open and close the vent. The sealing element can be arranged into a plate shape and a sheet structure, the sealing element is pivoted at the air outlet, the air outlet is opened or closed according to requirements, and the sealing of the flow passage is realized under the non-exhaust state.

Preferably, the flowing path of the gas with humidity difference with the outside in the exhaust passage is non-linear, which can be understood as that the exhaust passage 33 is non-linear or the air inlet and the air outlet are not on the same plane, so that the exhaust passage is non-linear, the blocking effect on the liquid in the exhaust gas is increased, the contact area between the gas and the exhaust passage is increased, and the condensation effect of the gas in the exhaust passage is increased. It is understood that the non-rectilinear shape of the vent passage 33 is part of the barrier structure.

Preferably, in order to achieve a better backflow effect, when the exhaust device is installed on the surface of the washing and drying machine shell, the exhaust port faces a direction away from the ground, and liquid in the gas with humidity difference with the outside flows back under the action of gravity.

The cross-sectional area of the exhaust port is larger than the cross-sectional area of the intake port. Specifically, the cross-sectional area of the exhaust passage 33 gradually increases in the direction from the intake port to the exhaust port. It is understood that the width of the exhaust passage 33 gradually increases in the direction from the intake port to the exhaust port. The increase in the cross-sectional area relatively increases the contact area with the liquid, the resistance to the liquid increases, and the contact area for forming the condensation effect increases. Specifically, the exhaust passage 33 includes a side wall whose width gradually decreases from top to bottom, which reduces the resistance to the backflow of the liquid and prevents the liquid from overflowing. The air inlet and the air outlet have a height difference, the air outlet is higher than the air inlet, the blocking effect on liquid in the exhaust gas is enhanced, the liquid is prevented from directly flowing to the ground, and the backflow of the liquid is better realized.

In addition, in order to facilitate the installation of the exhaust device 30, the exhaust device further comprises installation parts, wherein the installation parts are located on two sides of the air inlet and used for being installed at an air outlet of the dehumidification system. Specifically, the mounting portion is screwed on an exhaust passage or an air outlet of a dehumidification system of the washing and drying machine.

Preferably, the blocking structure further includes a filter 311, and the filter 311 is installed at the gas inlet 31 to filter the gas entering the exhaust passage and block the liquid. The filtering member 311 can filter fine impurities carried in the air, prevent the exhausted air from being mixed to affect the indoor air quality, and can block the liquid carried in the sprayed air.

In this embodiment, the first baffle 34 is detachably mounted in the exhaust passage 33 after being integrally formed with the second baffle 35, and the filter member 311 is mounted in the intake port 31 after the exhaust passage 33 is integrally formed with the intake port 31.

In other embodiments, the second baffle 35 may not be included, and the gas having a humidity difference with the outside may pass through the first baffle 34 only for one-time blocking and condensation, and the first baffle 34 may be detachably mounted on the exhaust passage 33 or may be integrally formed with the exhaust passage 33.

Correspondingly, the utility model discloses still provide a washing and drying machine 100, include as above washing and drying machine's exhaust apparatus 30. The washing and drying machine further comprises: the device comprises a box body, an inner cylinder 81, an outer cylinder 82, a fresh air duct 1 for introducing external fresh air into the device, a connecting air duct 6 and an exhaust air duct 2 for exhausting damp-heat air in the device. And the box body forms the basic external structure of the device.

An inner cylinder 81 and an outer cylinder 82 are arranged in the box body, the inner cylinder 81 is used for containing clothes, the inner cylinder 81 is arranged in the outer cylinder 82 and communicated with the outer cylinder 82 through a hole on the inner cylinder 81, and hot and humid air in the inner cylinder 81 can enter the outer cylinder 82. An exhaust inlet is provided in the outer cylinder 82.

Fresh air duct 1, fresh air duct 1's one end is for setting up the new trend entry on box front bezel or last roof, and the outside new trend of one end intercommunication in fresh air duct 1 promptly, and the box outside air is by new trend entry entering fresh air duct, via inner tube 81 intercommunication condenser 4. In short, the fresh air duct 1 introduces external fresh air into the inner cylinder 81 via the connecting air duct 6 and finally delivers the fresh air into the condenser 4. Preferably, the fresh air duct 1 is provided with an air filtering device to purify air entering the fresh air duct 1 from the inside and/or outside of the box body.

The air conditioner can also comprise an air inlet module 20, the other end of the air inlet module 20 is communicated with the inner cylinder 81, fresh air after being sterilized by the air inlet module 20 enters the inner cylinder 81 through the connecting air duct 6, enters the outer cylinder 82 through the inner cylinder 81 and then enters the heat exchange device 10 and the condenser 4.

One end of the air exhaust duct 2 is an air exhaust inlet arranged on the outer cylinder, and the other end is communicated with the heat exchange device 10; the damp and hot air in the inner cylinder 81 firstly enters the outer cylinder 82 through the holes on the inner cylinder 81, and then enters the exhaust air duct 2 from the exhaust air inlet to be exhausted.

The washer dryer may further include a condenser 4 communicating with the tub and adapted to condense hot and humid water vapor entering the condenser 4 from the tub 82. The damp and hot water vapor in the inner cylinder 81 enters between the inner cylinder and the outer cylinder through the holes on the inner cylinder 81 and enters the condenser 4 through the holes on the outer cylinder, the condenser 4 condenses the damp and hot gas entering the condenser from the outer cylinder, the other end of the condenser is communicated with the inner cylinder 81 so as to feed the condensed air into the inner cylinder 81 after being heated by the heating component 51 in the circulating air duct 5 under the action of the fan volute 52, and the condensed water flows into the drainage pump 71 along with the condensed water. Is discharged through the drain pipe 7 by the action of the drain pump 71.

One end of the circulating air duct 5 is communicated with the condenser 4, and the other end of the circulating air duct 5 is communicated with the inner cylinder 81; the air passing through the condenser 4 is condensed and then supplied into the inner drum 81 through the circulation duct 5.

Preferably, the circulating air duct 5 is provided with a heating assembly 51 and a fan volute 52, the damp and hot air in the inner cylinder 81 enters the outer cylinder 82 through the inner cylinder 81, then enters the condenser 4 through holes on the outer cylinder 82, the gas condensed by the condenser 4 enters the circulating air duct 5 under the action of the fan volute 52, and is heated by the heating assembly 51 and then circulates to the inner cylinder 81 to dry the clothes.

The washing and drying machine can also comprise a heat exchange device 10 for cooling and dehumidifying the damp-heat gas, and the high-temperature and high-humidity air enters the heat exchange device 10 through the exhaust air duct 2. When the heat exchanging device 10 is not present, the provided exhaust device 30 may be installed on the exhaust air duct 2, and when the heat exchanging device 10 is present, the provided exhaust device 30 is installed after the heat exchanging device 10, specifically, on the inner casing or the outer casing of the washing and drying machine, and before the gas is sprayed to the outside of the washing and drying machine, the air exchanging device 30 performs liquid blocking on the gas with relative humidity.

The exhaust device 30 is arranged behind the dehumidification system, and the air inlet of the exhaust device is arranged at the air outlet of the dehumidification system; the dehumidification system cools and dehumidifies the hot and humid air in the outer tub of the washing and drying machine to form air with a humidity difference with the outside, and the air is discharged to the exhaust device 30.

The inner cylinder 81 is communicated with the outer cylinder 82, and the outer cylinder 82 is provided with an exhaust inlet so as to discharge the damp and hot air in the inner cylinder 81 after being processed by the heat exchange device 10. One end of the air exhaust duct 2 is communicated with an air exhaust inlet arranged on the outer cylinder 82, and the other end is communicated with the heat exchange device 10.

Specifically, the heat exchanging device 10 includes an upper case 11, a lower case 13, a waterway structure, a heat conductive plate 123, and a wind path structure. Preferably, the waterway structure, the heat conducting plate 123 and the wind path structure are made of heat conducting materials.

The heat conductive plate 123 is located between the waterway structure and the wind path structure. The heat conducting plate 123 is provided with a drainage port, and preferably, the edge of the heat conducting plate 123 is bent towards the direction of the water path structure to form a baffle plate, that is, the baffle plate and the heat conducting plate 123 form an open groove, and the water path structure is located in the groove.

The waterway structure includes a plurality of upper fins 1211, and a waterway is formed between adjacent upper fins 1211. The bottom of the upper fin 1211 is integrally formed with the heat conductive plate 123. The wind path structure includes a plurality of lower fins 1221, and at least two lower fins 1221 are fin under the arc, form the arc wind channel between the fin under the adjacent arc.

The upper housing 11 is provided with a cooling medium inlet 111, and the lower housing 13 is provided with an air inlet 132, an air outlet 131, and a cooling medium outlet 133. The air inlet 132 is higher than the air outlet 131, and the air inlet 132 is larger than the air outlet 131, so as to avoid turbulence of the air flow. The cooling medium outlet 133 is lower than the cooling medium inlet 111, the air inlet 132, and the air outlet 131 to discharge condensed water.

The air inlet 31 of the air interchanger 30 is installed on the air outlet 131 of the heat exchanger 10, and guides the air exhausted by the washing and drying machine and having a humidity difference with the outside into the exhaust passage, so that the liquid in the air flows back after passing through the blocking structure and flows back into the heat exchanger 10.

The utility model provides an exhaust apparatus of washing and drying machine, install at casing inner wall or outer wall, do not increase the volume of washing and drying machine, the gas that has the humidity difference with the external world that will wash the machine exhaust is guided to the exhaust passage in, make the liquid in the gas flow back after blockking the structure, discharge together with the comdenstion water that the inside clothing of washing and drying machine was dried and produced, prevent a small amount of liquid in the gas from flowing to ground after the gas blowout; and the inclined plane design of the first baffle in the blocking structure and the combined design of the first baffle and the second baffle can realize higher liquid blocking effect and backflow effect.

In some embodiments, the washer dryer may be a carry-on dryer or a washer dryer.

While the embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields where the invention is suitable, and further modifications may readily be made by those skilled in the art, and the invention is therefore not limited to the specific details without departing from the general concept defined by the claims and the scope of equivalents.

Claims (14)

1. An exhaust device of a washing and drying machine is arranged on a shell of the washing and drying machine; it is characterized by comprising an air inlet, an exhaust channel and an exhaust port; the air inlet, the exhaust channel and the exhaust port form an exhaust passage; wherein a liquid-impeding barrier is provided along the path of the exhaust passage;

the air inlet guides the air which is exhausted by the washing and drying machine and has humidity difference with the outside into the exhaust channel, liquid in the air flows back after passing through the blocking structure, and the air is exhausted to the outside of the washing and drying machine from the exhaust port.

2. The exhaust system of a washer dryer as claimed in claim 1, characterized in that said blocking structure comprises a first baffle plate, said first baffle plate being provided with a plurality of ventilation holes, said ventilation holes forming said exhaust port.

3. The exhaust apparatus of washer dryer as claimed in claim 2, wherein said first baffle comprises a first inclined surface and/or a second inclined surface along which the liquid in the gas having a difference in humidity from the outside flows back.

4. The exhaust device of washing and drying machine as claimed in claim 2, wherein said blocking structure further comprises at least one second baffle plate disposed along the extending direction of the exhaust passage, a blocking portion is disposed at the middle position of said second baffle plate, and a plurality of air holes are disposed at both ends of said blocking portion.

5. The exhaust of a washer dryer as claimed in claim 1, wherein said blocking structure further comprises a seal disposed at said exhaust port, said seal configured to open and close said exhaust port.

6. The exhaust system of claim 1, wherein the flow path in the exhaust passage is non-linear to increase resistance to liquid in the exhaust gases.

7. The exhaust system of claim 1, wherein the exhaust port is oriented away from the floor when the exhaust system is mounted on the surface of the washer dryer housing, and liquid in the air having a humidity difference with the outside flows back by gravity.

8. The exhaust of a washer dryer as claimed in claim 1, wherein said exhaust port has a cross-sectional area greater than a cross-sectional area of said intake port.

9. The exhaust system of a washer dryer as claimed in claim 1, characterized in that the cross-sectional area of said exhaust passage increases in a direction from said air inlet to said air outlet.

10. The exhaust of a washer dryer as claimed in claim 1, characterized in that said exhaust channel comprises a side wall, the width of said side wall decreasing from top to bottom.

11. The exhaust apparatus of a washer dryer as claimed in claim 1, further comprising a mounting portion located on either side of said air inlet.

12. The exhaust of a washer dryer as claimed in claim 1, wherein said blocking structure further comprises a filter element mounted at said air inlet for filtering gas entering said exhaust passage and blocking liquid.

13. A washer dryer comprising an exhaust of a washer dryer according to any of claims 1 to 12.

14. The washer dryer as claimed in claim 13, wherein said air exhaust is mounted behind a dehumidification system, an air inlet of said air exhaust being mounted at an air outlet of the dehumidification system;

the dehumidification system cools and dehumidifies the damp and hot air in the outer barrel of the washing and drying machine to form gas with humidity difference with the outside, and the gas is discharged to the exhaust device.

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