CN210766044U - Internal circulation clothes dryer and drying system - Google Patents

Abstract

The utility model provides an internal circulation clothes dryer and a drying system. The clothes dryer includes a clothes drying drum, a circulating air passage, an air supply mechanism and a heat pump unit. Evaporator, compressor, condenser and throttle valve on the agent pipeline, the evaporator includes an evaporator shell, and the evaporator shell is provided with heat exchange plates arranged at intervals in layers, and the space between adjacent heat exchange plates A dehumidification channel is formed, the air outlet of the clothes dryer is connected with the dehumidification inlet, the refrigerant pipeline is inserted into the evaporator shell through the heat exchange plate, and the dehumidification inlet and dehumidification outlet of the adjacent dehumidification channel are located in the refrigerant pipeline. The two sides are staggered, so that the dehumidified and cooled air can pass through the heat exchange plate for secondary heat exchange with the hot and humid air entering the adjacent dehumidification channel; the condenser includes a condenser shell with a heating channel inside, and the dehumidification outlet and the heating The inlet is communicated, and the air inlet of the clothes dryer is communicated with the heating outlet.

Description

An inner circulation clothes dryer and drying system

technical field

The utility model relates to the field of an inner circulation clothes dryer and a drying system.

Background technique

With the improvement of people's living standards and the acceleration of the pace of life, clothes dryers have the advantages of fast drying of clothes and no drying, and are gradually becoming common daily household appliances.

For example, the Chinese invention patent with the authorization announcement number of CN106245291B and the authorization announcement number of 2018.10.09 discloses a clothes dryer, and specifically discloses that the dryer has a box body, a drying room, a circulating air duct, an air supply mechanism, In the heat pump unit, the heat pump included in the heat pump unit cyclically connects a compressor, a condenser, a restrictor, and an evaporator using a refrigerant pipe to form a refrigeration cycle. Among them, the condenser and the evaporator constituting the heat exchanger are arranged in the intermediate air passage of the circulating air passage. The evaporator is arranged on the upstream side of the condenser. The condenser functions as a heating mechanism that heats the air passing through the circulating air passage, and the evaporator acts as a dehumidifier that cools and dehumidifies the air passing through the circulating air passage. institutions play a role.

In the prior art, the high-humidity air in the drying room is passed into the evaporator through the circulating air passage, cooled by the refrigerant pipe to liquefy the moisture in the air into water droplets for dehumidification, and then directly discharged and then passed through the circulating air passage to be condensed In the dryer, the air is heated by the refrigerant tube heating, and finally the hot air is circulated into the drying room to dry the clothes. However, in the evaporator, the air is only dehumidified through the refrigerant pipe, the contact area between the air and the pipe wall of the refrigerant pipe is limited, the heat exchange efficiency is low, and the dehumidification and heating effects are poor, which eventually leads to the entire clothes dryer. Work efficiency is low.

Utility model content

In order to solve the above problems, the purpose of the present utility model is to provide an inner circulation clothes dryer, so as to solve the problem in the prior art that due to the low heat exchange efficiency of the evaporator and the poor dehumidification and heating effects, the entire clothes dryer is drying clothes. the problem of low work efficiency. At the same time, the purpose of the utility model is to provide a drying system.

The technical scheme of the inner circulation clothes dryer of the present utility model is as follows:

The inner circulation clothes dryer includes a clothes dryer, a circulating air path connected to the air inlet and the air outlet of the clothes dryer, an air supply mechanism and a heat pump unit connected in series on the circulating air path, and the heat pump unit includes a refrigerant pipe circuit, and an evaporator, a compressor, a condenser and a throttle valve that are serially connected to the refrigerant pipeline, the evaporator includes an evaporator shell, and the evaporator shell is provided with heat exchange plates arranged at intervals in layers , the space between the adjacent heat exchange plates forms a dehumidification channel, the air outlet of the clothes dryer is connected to the dehumidification channel, the refrigerant pipeline penetrates the heat exchange plate and is inserted into the evaporator shell, and the adjacent dehumidification channel The dehumidification inlet and the dehumidification outlet are arranged in a staggered arrangement on both sides of the refrigerant pipeline, so that the dehumidified and cooled air conducts secondary heat exchange with the hot and humid air entering the adjacent dehumidification channel through the heat exchange plate; the condensation The dryer includes a condenser shell with a heating channel inside, the dehumidification outlet communicates with the heating inlet of the heating channel, and the air inlet of the clothes dryer is communicated with the heating outlet of the heating channel.

Beneficial effect: After passing through the refrigerant pipeline, the hot and humid air becomes dry and cold air. Since the air flows in the opposite directions in the two adjacent dehumidification channels, the dry and cold air after passing through the refrigerant pipeline can also pass through the heat exchange plate and adjacent channels. The hot and humid air that has not passed through the refrigerant pipeline conducts heat exchange, that is, the dry and cold air in the dehumidification channel pre-cools the hot and humid air that has just entered the dehumidification channel. The dry and cold air in the dehumidification channel is preheated. From the perspective of the entire evaporator, the heat exchange area is not limited to the refrigerant pipeline, and the heat exchange plate is another part of the heat exchange area, which can perform auxiliary cooling of hot and humid air and auxiliary heating after cooling. The auxiliary cooling effect of the heat exchange plate further utilizes the low temperature of the dry and cold air, avoids the low temperature dry and cold air being directly discharged from the dehumidification channel, and also improves the dehumidification effect of the hot and humid air; correspondingly, the auxiliary heating effect of the heat exchange plate ensures that The dry and cold air can raise the temperature in time and indirectly save the heat output by the condenser. More importantly, through the secondary heat exchange between the dry and cold air and the hot and humid air, the energy efficiency of the heat pump unit is fully utilized, and at the same time, the dual functions of improving the dehumidification effect and the heating effect are achieved, ensuring that the dryer can dry clothes effectively. Work more efficiently.

Further, in order to facilitate the docking and communication with the circulating air passage, the evaporator shell is provided with a dehumidification inlet slope and a dehumidification outlet slope on the same side of the refrigerant pipeline, and the dehumidification inlet slope and the dehumidification outlet slope form an opening facing the Angle of refrigerant line.

Further, in order to uniformly cool and dehumidify the hot and humid air entering the dehumidification channel, a refrigerant circulation tube bundle is arranged on the refrigerant pipeline, and the refrigerant circulation tube bundle is inserted into the evaporator shell through the heat exchange plate.

Further, in order to improve the dehumidification efficiency, the refrigerant circulation tube bundle is arranged in the middle of the evaporator casing.

Further, in order to uniformly cool and dehumidify the hot and humid air entering the dehumidification channel, the refrigerant circulation tube bundles are arranged in multiple rows in a vertical plane perpendicular to the air circulation direction in the dehumidification channel, and two adjacent rows of refrigeration The position of the agent flow tube bundle is staggered.

Further, in order to increase the area of heat exchange between the dry and cold air and the hot and humid air in the evaporator through the heat exchange plate, the heat exchange plate is a corrugated plate with a concave and convex cross section, and the undulating extension direction of the corrugated plate is perpendicular to the The direction of air circulation in the dehumidification channel.

Further, in order to increase the area of heat exchange between the dry and cold air and the hot and humid air in the evaporator through the heat exchange plate, the heat exchange plate is an arcuate plate with a concave and convex cross-section, and the undulating extension direction of the arcuate plate. It is perpendicular to the direction of air circulation in the dehumidification channel.

Further, in order to prevent the condensed water from accumulating in the dehumidification channel and affecting the normal circulation of the air, the evaporator casing is also provided with a drain pipe for the condensed water to be discharged to the outside.

Further, to ensure sufficient air supply power and avoid long-term contact with high-humidity gas, the air supply mechanism is a fan arranged downstream of the heating outlet of the circulating air path.

The technical scheme of the drying system of the present utility model is:

The drying system includes a drying chamber, a circulating air path connected to the air inlet and the air outlet of the drying chamber, an air supply mechanism and a heat pump unit connected in series on the circulating air path, and the heat pump unit includes a refrigerant pipeline, and a series of An evaporator, a compressor, a condenser and a throttle valve connected to the refrigerant pipeline, the evaporator includes an evaporator shell, and the evaporator shell is provided with heat exchange plates arranged at intervals in layers, adjacent heat exchange plates The space between the plates forms a dehumidification channel, the air outlet of the drying chamber is communicated with the dehumidification channel, the refrigerant pipeline is inserted into the evaporator shell through the heat exchange plate, and the dehumidification inlet and dehumidification outlet of the adjacent dehumidification channel The two sides of the refrigerant pipeline are arranged in a staggered manner, so that the dehumidified and cooled air passes through the heat exchange plate and conducts secondary heat exchange with the hot and humid air entering the adjacent dehumidification channel; the condenser includes a heating channel inside. The condenser shell, the dehumidification outlet is communicated with the heating inlet of the heating channel, and the air inlet of the drying chamber is communicated with the heating outlet of the heating channel.

Beneficial effect: After passing through the refrigerant pipeline, the hot and humid air becomes dry and cold air. Since the air flows in the opposite directions in the two adjacent dehumidification channels, the dry and cold air after passing through the refrigerant pipeline can also pass through the heat exchange plate and adjacent channels. The hot and humid air that has not passed through the refrigerant pipeline conducts heat exchange, that is, the dry and cold air in the dehumidification channel pre-cools the hot and humid air that has just entered the dehumidification channel. The dry and cold air in the dehumidification channel is preheated. From the perspective of the entire evaporator, the heat exchange area is not limited to the refrigerant pipeline, and the heat exchange plate is another part of the heat exchange area, which can perform auxiliary cooling of hot and humid air and auxiliary heating after cooling. The auxiliary cooling effect of the heat exchange plate further utilizes the low temperature of the dry and cold air, avoids the low temperature dry and cold air being directly discharged from the dehumidification channel, and also improves the dehumidification effect of the hot and humid air; correspondingly, the auxiliary heating effect of the heat exchange plate ensures that The dry and cold air can raise the temperature in time and indirectly save the heat output by the condenser. More importantly, through the secondary heat exchange between the dry and cold air and the hot and humid air, the energy efficiency of the heat pump unit is fully utilized, and at the same time, the dual functions of improving the dehumidification effect and the heating effect are achieved, ensuring that the dryer can dry clothes effectively. Work more efficiently.

Further, in order to facilitate the docking and communication with the circulating air passage, the evaporator shell is provided with a dehumidification inlet slope and a dehumidification outlet slope on the same side of the refrigerant pipeline, and the dehumidification inlet slope and the dehumidification outlet slope form an opening facing the Angle of refrigerant line.

Further, in order to uniformly cool and dehumidify the hot and humid air entering the dehumidification channel, a refrigerant circulation tube bundle is arranged on the refrigerant pipeline, and the refrigerant circulation tube bundle is inserted into the evaporator shell through the heat exchange plate.

Further, in order to improve the dehumidification efficiency, the refrigerant circulation tube bundle is arranged in the middle of the evaporator casing.

Further, in order to uniformly cool and dehumidify the hot and humid air entering the dehumidification channel, the refrigerant circulation tube bundles are arranged in multiple rows in a vertical plane perpendicular to the air circulation direction in the dehumidification channel, and two adjacent rows of refrigeration The position of the agent flow tube bundle is staggered.

Further, in order to increase the area of heat exchange between the dry and cold air and the hot and humid air in the evaporator through the heat exchange plate, the heat exchange plate is a corrugated plate with a concave and convex cross section, and the undulating extension direction of the corrugated plate is perpendicular to the The direction of air circulation in the dehumidification channel.

Further, in order to increase the area of heat exchange between the dry and cold air and the hot and humid air in the evaporator through the heat exchange plate, the heat exchange plate is an arcuate plate with a concave and convex cross-section, and the undulating extension direction of the arcuate plate. It is perpendicular to the direction of air circulation in the dehumidification channel.

Further, in order to prevent the condensed water from accumulating in the dehumidification channel and affecting the normal circulation of the air, the evaporator casing is also provided with a drain pipe for the condensed water to be discharged to the outside.

Further, in order to ensure sufficient air supply power and avoid long-term contact with high-humidity gas, the air supply mechanism is a fan arranged downstream of the heating outlet of the circulating air passage.

Description of drawings

Fig. 1 is the working principle diagram of the specific embodiment 1 of the inner circulation clothes dryer of the present invention;

Fig. 2 is the three-dimensional structure schematic diagram of the evaporator in the specific embodiment 1 of the inner circulation clothes dryer of the present invention;

Fig. 3 is the right side schematic diagram of Fig. 2;

4 is a schematic front view of FIG. 2;

5 is a schematic diagram of the circulation of air in the evaporator in the specific embodiment 1 of the inner circulation clothes dryer of the present invention;

6 is a vertical cross-sectional view of the evaporator perpendicular to the air circulation direction in the specific embodiment 2 of the inner circulation clothes dryer of the present invention;

7 is a vertical cross-sectional view of the evaporator in the specific embodiment 3 of the inner circulation clothes dryer of the present invention, which is perpendicular to the air circulation direction.

In the picture: 1-clothing drum, 2-circulating air duct, 3-fan, 4-evaporator, 40-evaporator shell, 41-dehumidification inlet slope, 410-dehumidification inlet, 42-dehumidification outlet slope, 420- Dehumidification outlet, 43-refrigerant circulation tube bundle, 44-heat exchange flat plate, 45-corrugated plate, 46-bow plate, 5-compressor, 6-condenser, 7-throttle valve, 8-refrigerant pipeline, a1-dry hot air, a2-hot humid air, a3-dry cold air, b1-low pressure gaseous refrigerant, b2-high pressure gaseous refrigerant, b3-liquid refrigerant, c-condensed water.

Detailed ways

The specific embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

The specific embodiment 1 of the inner circulation clothes dryer of the present invention, as shown in FIG. 1 to FIG. 5 , the inner circulation clothes dryer includes a clothes drying drum 1 , a circulation circuit connected to the air inlet and the air outlet of the clothes drying drum 1 . The air passage 2, the fan 3 and the heat pump unit connected in series on the circulating air passage 2, the heat pump unit includes a refrigerant pipeline 8, and an evaporator 4, a compressor 5, a condenser connected in series on the refrigerant pipeline 8 in sequence The evaporator 6 and the throttle valve 7 and the evaporator 4 are connected in series on the circulating air path 2 located downstream of the clothes dryer 1 to cool and dehumidify the hot and humid air a2 discharged from the air outlet of the clothes dryer 1 . The condenser 6 is connected in series on the circulating air path 2 and is located downstream of the evaporator 4. The dehumidification outlet 420 of the evaporator 4 is communicated with the heating inlet of the condenser 6, and the heating outlet of the condenser 6 is communicated with the air inlet of the drying drum 1. , in order to heat the dry and cold air a3 to form dry and hot air a1 and then enter into the drying drum 1. The dry and hot air a1 dehumidifies the wet clothes by air-heating in the drying drum 1, and the moisture in the wet clothes is removed by the circulation of air. walk for quick drying of laundry. The fan 3 is set at the downstream position of the heating outlet of the circulating air duct 2, and the dry and hot air is directly blown into the clothes dryer 1 through the fan 3, which ensures sufficient air supply power, avoids long-term contact with high-humidity gas, and ensures that the Working stability and service life.

In the heat pump unit, the compressor 5 is connected in series on the refrigerant pipeline 8 where the refrigerant flows from the evaporator 4 to the condenser 6 , and the throttle valve 7 is connected in series on the refrigerant flowing back from the condenser 6 to the evaporator 4 . on line 8. When the refrigerant flows through the evaporator 4, it is gasified from a liquid state to a low-pressure gas state. At the same time, the refrigerant absorbs heat from the hot and humid air a2 through the tube wall, and the moisture in the hot and humid air a2 encounters the refrigerant circulation tube bundle 43. When the wall is liquefied into condensed water c, the effect of cooling and dehumidifying the hot and humid air a2 is achieved; the low-pressure gaseous refrigerant b1 is pressurized by the compressor 5 to form a high-pressure gaseous refrigerant b2, and the high-pressure gaseous refrigerant b2 flows through the condensation At the same time, the refrigerant releases heat to the dry and cold air a3 through the tube wall, so as to achieve the effect of heating the dry and cold air a3; the liquid refrigerant b3 passes through the throttle valve 7. The pressure is recirculated to the evaporator 4 .

The evaporator 4 includes an evaporator shell 40 , and heat exchange flat plates 44 arranged at intervals in layers are arranged in the evaporator shell 40 , and the space between the adjacent heat exchange plates 44 forms a dehumidification channel. In this embodiment, the heat exchange plate 44 constitutes a heat exchange plate for performing secondary heat exchange between the cooled and dehumidified air and the hot and humid air a2 in the adjacent dehumidification channel. The refrigerant pipeline 8 is provided with a refrigerant circulation tube bundle 43 inserted through the heat exchange plate 44 and inserted in the middle of the evaporator shell 40. The refrigerant circulation tube bundle 43 is arranged in three rows in a vertical direction perpendicular to the air circulation direction in the dehumidification channel. In the plane, and the positions of the refrigerant flow tube bundles 43 in two adjacent rows are staggered. The refrigerant circulation tube bundles 43 are arranged in multiple rows and their positions are staggered, which ensures uniform cooling and dehumidification of the hot and humid air a2 entering the dehumidification channel, and improves the dehumidification efficiency.

The evaporator shell 40 is a hollow octagonal prism, the slope between the front side and the right side, and the slope between the front side and the left side are respectively the dehumidification outlet slope 42, and the slope between the rear side and the right side is respectively the dehumidification outlet slope 42. The slope between the side surfaces and the slope between the rear side surface and the left side surface are respectively the dehumidification inlet slope 41 . The dehumidification inlet slope 41 and the dehumidification outlet slope 42 on the left or right form an included angle with the opening facing the refrigerant flow tube bundle 43, and the dehumidification inlet slope 41 is provided with a dehumidification inlet 410 at intervals up and down, and the dehumidification outlet slope 42 is up and down. Dehumidification outlets 420 are provided at intervals, and dehumidification inlets 410 of adjacent dehumidification channels are located on both sides of the refrigerant flow tube bundle 43 and are arranged staggered. The dehumidification inlet 410 and the dehumidification outlet 420 are arranged in a staggered arrangement to facilitate connection with the circulating air passage.

The hot and humid air a2 is introduced into the dehumidification channel from the dehumidification inlet 410. When the hot and humid air a2 flows through the refrigerant circulation tube bundle 43, it exchanges heat with the refrigerant through the tube wall, and the water in the hot and humid air a2 is cooled into condensed water c. After the refrigerant flows through the tube bundle 43, the hot and humid air a2 becomes the dry and cold air a3. Since the air flows in two adjacent dehumidification channels in opposite directions, the dry and cold air a3 after passing through the refrigerant circulation tube bundle 43 can also pass through the heat exchange plate 44 and the hot and humid air a2 in the adjacent channel that has not passed through the refrigerant circulation tube bundle 43. Heat exchange, that is, the dry and cold air a3 in the dehumidification channel pre-cools the hot and humid air a2 that has just entered the dehumidification channel. Similarly, the hot and humid air a2 that has just entered the dehumidification channel also pre-cools the dry and cold air a3 in the dehumidification channel. heating.

From the perspective of the entire evaporator 4, the heat exchange area is not limited to the refrigerant flow tube bundle 43, and the heat exchange plate 44 is another part of the heat exchange area, which can perform auxiliary cooling and auxiliary heating after cooling for the hot humid air a2. The auxiliary cooling effect of the heat exchange plate 44 further utilizes the low temperature of the dry and cold air a3, which prevents the low temperature dry and cold air a3 from being directly discharged from the dehumidification channel, and also improves the dehumidification effect on the hot and humid air a2; The auxiliary heating function ensures that the temperature of the dry and cold air a3 can be raised in time, and indirectly saves the heat output by the condenser 6 . More importantly, through the secondary heat exchange between the dry and cold air a3 and the hot and humid air a2, the energy efficiency of the heat pump unit is fully utilized, and the dual functions of improving the dehumidification effect and the heating effect are achieved at the same time. In addition, the evaporator shell 40 is also provided with a drain pipe, which is not shown in the figure. The position of each layer of the heat exchange flat plate 44 corresponding to the refrigerant circulation pipe bundle 43 is provided with a drainage pipe extending along the parallel arrangement direction of the refrigerant circulation pipe bundle 43 Guide groove, the drainage guide groove is slightly recessed downward, and the side wall of the evaporator shell 40 is provided with an opening corresponding to the bottom position of the drainage guide groove, the drainage pipe is connected at each opening position, and the drainage pipe is connected with each dehumidification channel In order to discharge the condensed water c out, avoid the accumulation of the condensed water c in the dehumidification channel and affect the normal circulation of the air.

The specific embodiment 2 of the inner circulation clothes dryer of the present invention is different from the specific embodiment 1 in that, as shown in FIG. The heat exchange area can improve the heat exchange efficiency and drying quality. The heat exchange plate can be a corrugated plate with a concave and convex cross section. The undulating extension direction of the corrugated plate is perpendicular to the direction of air circulation in the dehumidification channel. At the same time ensure the smoothness of air circulation.

The specific embodiment 3 of the inner circulation clothes dryer of the present invention is different from the specific embodiment 1 in that, as shown in FIG. The heat exchange area can improve the heat exchange efficiency and drying quality. The heat exchange plate can be a concave-convex-shaped plate with a concave-convex cross-section. The undulating extension direction of the arch-shaped plate is perpendicular to the direction of air circulation in the dehumidification channel, which increases heat exchange. area while ensuring the smoothness of air circulation.

The specific embodiment 4 of the inner circulation clothes dryer of the present invention is different from the specific embodiment 1 in that, in order to simplify the structure and facilitate the arrangement of the refrigerant pipelines in the heat pump unit, it is possible to omit the provision of refrigerant on the refrigerant pipelines. The tube bundle is circulated, and the refrigerant pipeline is directly inserted into the evaporator shell through the heat exchange plate, and the air is cooled and dehumidified through the tube wall of a single refrigerant pipeline.

In a specific embodiment of the drying system of the present invention, the drying system includes a drying chamber, a circulating air path connected to the air inlet and air outlet of the drying chamber, and an air supply mechanism and a heat pump unit connected in series on the circulating air path. The heat pump unit It is the same as the heat pump unit of each specific embodiment of the internal circulation clothes dryer in the specific embodiments of the internal circulation clothes dryer of the present invention, and will not be repeated here. More specifically, the drying system may also be a fruit and vegetable drying system or the like.

Claims (10)

1. An inner circulation clothes dryer, comprising a clothes dryer, a circulating air path that is communicated at the air inlet and the air outlet of the clothes dryer, and an air supply mechanism and a heat pump unit connected in series on the circulating air path, it is characterized in that , the heat pump unit includes a refrigerant pipeline, and an evaporator, a compressor, a condenser and a throttle valve serially connected to the refrigerant pipeline, the evaporator includes an evaporator shell, and the evaporator shell is provided with The heat exchange plates are arranged at intervals in layers, the space between the adjacent heat exchange plates forms a dehumidification channel, the air outlet of the clothes dryer is connected with the dehumidification channel, and the refrigerant pipeline passes through the heat exchange plates and is inserted into the evaporator. In the housing, the dehumidification inlets and dehumidification outlets of adjacent dehumidification channels are located on both sides of the refrigerant pipeline, so that the dehumidified and cooled air passes through the heat exchange plate and the hot and humid air entering the adjacent dehumidification channels. Perform secondary heat exchange; the condenser includes a condenser shell with a heating channel inside, the dehumidification outlet communicates with the heating inlet of the heating channel, and the air inlet of the clothes dryer communicates with the heating outlet of the heating channel. 2. The inner circulation clothes dryer according to claim 1, wherein the evaporator shell is provided with a dehumidification inlet slope and a dehumidification outlet slope on the same side of the refrigerant pipeline, and the dehumidification inlet slope and the dehumidification outlet slope are provided. The inclined surface of the dehumidification outlet forms an included angle where the opening faces the refrigerant pipeline. 3. The inner circulation clothes dryer according to claim 1 or 2, wherein a refrigerant circulation tube bundle is arranged on the refrigerant pipeline, and the refrigerant circulation tube bundle is inserted into the evaporator shell through the heat exchange plate in the body. 4 . The internal circulation clothes dryer according to claim 3 , wherein the refrigerant circulation tube bundle is arranged in the middle of the evaporator casing. 5 . 5 . The inner circulation clothes dryer according to claim 3 , wherein the refrigerant circulation tube bundles are arranged in multiple rows in a vertical plane perpendicular to the air circulation direction in the dehumidification channel, and two adjacent rows of The position of the refrigerant flow tube bundle is staggered. 6. The inner circulation clothes dryer according to claim 1 or 2, wherein the heat exchange plate is a corrugated plate with a concave and convex cross section, and the undulating extension direction of the corrugated plate is perpendicular to the air circulation in the dehumidification channel. direction. 7. The inner circulation clothes dryer according to claim 1 or 2, wherein the heat exchange plate is an arcuate plate with a concave and convex cross section, and the undulating extension direction of the arcuate plate is perpendicular to the air in the dehumidification channel direction of flow. 8 . The inner circulation clothes dryer according to claim 1 or 2 , wherein the evaporator shell is further provided with a drain pipe for draining the condensed water to the outside. 9 . 9 . The inner circulation clothes dryer according to claim 1 or 2 , wherein the air blowing mechanism is a fan arranged downstream of the heating outlet of the circulation air passage. 10 . 10. A drying system, comprising a drying chamber, a circulating air path connected to an air inlet and an air outlet of the drying chamber, and an air supply mechanism and a heat pump unit connected in series on the circulating air path, wherein the heat pump unit is The same as the heat pump unit in the internal circulation clothes dryer of claims 1 to 9.

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