heat pump dryer

Abstract

The present invention belongs to the technical field of clothes dryers, and specifically relates to a heat pump clothes dryer. The present invention aims to solve the problem of lint adhering to the evaporator, which leads to a decrease in the heat exchange efficiency of the evaporator. The heat pump clothes dryer of the present invention includes a housing, an evaporator and a cleaning system. The bottom of the housing has a water tank, and the evaporator is arranged on the upper part of the water tank; the cleaning system includes a driving device, a rotating shaft and an impeller arranged on the rotating shaft, the rotating shaft is rotatably connected to the housing, and the rotating shaft is transmission-connected to the driving device; the impeller is located in the water tank, and the impeller is used to spray the water in the water tank onto the evaporator when rotating. Through the above arrangement, when the impeller rotates, the condensed water in the water tank enters the impeller from the axial direction of the impeller and is thrown out to the evaporator from the radial direction of the impeller. The condensed water on the evaporator flushes the lint accumulated on the evaporator into the water tank during the downward flow, thereby reducing the lint accumulated on the evaporator, increasing the contact area between the air and the evaporator, and improving the heat exchange efficiency of the evaporator.

Description

Technical Field

[0001] The embodiments of the present invention belong to the technical field of clothes dryers, and particularly relate to a heat pump clothes dryer. Background Art

[0002] A heat pump dryer is a new type of clothing drying device that uses heat pump technology. A heat pump dryer usually includes a drying drum, a circulating air duct, and a heat pump system. The heat pump system can heat and dry the air in the circulating air duct, and the air in the circulating air duct flows through the drying drum and dries the clothes.

[0003] In related art, a clothes dryer has an air inlet and an air outlet connected to a circulating air duct. The heat pump system includes an evaporator and a condenser disposed within the circulating air duct, with the condenser positioned near the air inlet. During operation, air from the air outlet flows sequentially through the evaporator and condenser before entering the clothes dryer through the air inlet. The evaporator liquefies water vapor in the air, while the condenser heats the air entering the clothes dryer.

[0004] However, lint is generated during the drying process of clothes. When the lint flows through the evaporator with the air, it will adhere to the evaporator, reducing the heat exchange efficiency of the evaporator. Summary of the Invention

[0005] In order to solve the above-mentioned problems in the prior art, that is, to solve the problem that lint adheres to the evaporator, resulting in a decrease in the heat exchange efficiency of the evaporator, an embodiment of the present invention provides a heat pump dryer, including: an evaporator, a shell and a cleaning system, the bottom of the shell has a water tank, and the evaporator is arranged on the upper part of the water tank; the cleaning system includes a driving device, a rotating shaft and an impeller arranged on the rotating shaft, the rotating shaft is rotatably connected to the shell, and the rotating shaft is transmission-connected to the driving device; the impeller is located in the water tank, and the impeller is used to spray the water in the water tank onto the evaporator when rotating.

[0006] In the preferred technical solution of the above-mentioned heat pump dryer, the impeller includes an auxiliary plate connected to the rotating shaft, and a plurality of blades vertically arranged on the auxiliary plate, and the plurality of blades are arranged at equal central angles around the axis of the rotating shaft.

[0007] In the preferred technical solution of the above heat pump clothes dryer, the impeller further includes a reinforcement ring, which is provided at one end of the blade away from the auxiliary plate, and the reinforcement ring is connected to each of the blades.

[0008] In the preferred technical solution of the above heat pump clothes dryer, there are multiple impellers, and the multiple impellers are arranged at intervals along the axial direction of the rotating shaft.

[0009] In the preferred technical solution of the above heat pump dryer, the blades are arc-shaped.

[0010] In the preferred technical solution of the above-mentioned heat pump dryer, an air inlet and an air outlet are provided on the shell, and the evaporator is located between the air inlet and the air outlet; the bottom of the shell forms the water trough, and a plurality of water retaining plates are vertically provided at the bottom of the water trough, and the plurality of water retaining plates are arranged at intervals along the direction from the air inlet to the air outlet.

[0011] In the preferred technical solution of the above-mentioned heat pump dryer, the heat pump dryer also includes a drainage device, a drainage outlet is provided on the drainage trough wall adjacent to the trough bottom, the drainage device is connected to the drainage outlet, and the drainage device is used to extract water from the water trough.

[0012] In the preferred technical solution of the above heat pump clothes dryer, a flow gap is formed between the end of the water retaining plate between the drain outlet and the rotating shaft facing the drain groove wall and the drain groove wall.

[0013] In the preferred technical solution of the above heat pump dryer, a mounting plate is provided on the shell, the mounting plate is parallel to the horizontal plane, and the evaporator is provided on the mounting plate; a plurality of holes are provided on the mounting plate corresponding to the evaporator.

[0014] In the preferred technical solution of the above heat pump dryer, the heat pump dryer further includes a condenser, which is arranged on the mounting plate and is located on a side of the evaporator facing the air inlet.

[0015] It will be understood by those skilled in the art that the heat pump dryer provided in the embodiment of the present invention includes a housing, an evaporator disposed in the housing, and a cleaning system, wherein the bottom of the housing has a water tank, and the evaporator is disposed above the water tank; the cleaning system includes a driving device, a rotating shaft, and an impeller disposed on the rotating shaft, wherein the rotating shaft is rotatably connected to the housing and is in transmission connection with the driving device; the impeller is located in the water tank, and is used to spray water in the water tank onto the evaporator when the impeller rotates. Through the above arrangement, condensed water formed by condensation of water vapor in the air at the evaporator is accumulated in the water tank. When the impeller rotates, the condensed water in the water tank enters the impeller from the axial direction of the impeller and is thrown out from the radial direction of the impeller onto the evaporator. The condensed water on the evaporator flushes the lint accumulated on the evaporator into the water tank during its downward flow, thereby reducing the lint accumulated on the evaporator, increasing the contact area between the air and the evaporator, and thus improving the heat exchange efficiency of the evaporator. In addition, the impeller disturbs the condensed water in the water tank during its rotation, increasing the mobility of the lint and allowing the lint to be discharged along with the condensed water, thus preventing the lint from remaining in the water tank for a long time and producing mold and odor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The preferred embodiment of the heat pump clothes dryer of the present invention will be described below with reference to the accompanying drawings and in combination with the heat pump clothes dryer.

[0017] Figure 1 This is a schematic diagram of the structure of the heat pump dryer provided by the embodiment of the present invention. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the structure of the heat pump dryer provided by the embodiment of the present invention. Figure 2 ;

[0019] Figure 3 This is a schematic diagram of the structure of the heat pump dryer provided by the embodiment of the present invention. Figure 3 ;

[0020] Figure 4 yes Figure 3 The enlarged schematic diagram of P in the middle;

[0021] Figure 5 This is a schematic diagram of the structure of the heat pump dryer provided by the embodiment of the present invention. Figure 4 ;

[0022] Figure 6 This is a schematic diagram of the structure of the heat pump dryer provided by the embodiment of the present invention. Figure 5 ;

[0023] Figure 7 This is a schematic diagram of the structure of the mounting plate in the heat pump dryer provided by the embodiment of the present invention. Figure 1 ;

[0024] Figure 8 This is a schematic diagram of the structure of the mounting plate in the heat pump dryer provided by the embodiment of the present invention. Figure 2 ;

[0025] Figure 9 This is a schematic diagram of the structure of the heat pump dryer provided by the embodiment of the present invention. Figure 6 .

[0026] In the attached figure:

[0027] 10. Housing;

[0028] 101. Sink;

[0029] 102. Water retaining plate;

[0030] 103. Drainage outlet;

[0031] 104, mounting plate;

[0032] 105. Holes;

[0033] 20. Evaporator;

[0034] 30. Condenser;

[0035] 401, motor;

[0036] 402, shaft;

[0037] 403, impeller;

[0038] 404, auxiliary board;

[0039] 405, leaves;

[0040] 406, reinforcement ring;

[0041] 407, support plate;

[0042] 408, support column;

[0043] 50. Water pump. DETAILED DESCRIPTION

[0044] First, those skilled in the art should understand that these embodiments are merely for explaining the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art may adjust them as needed to suit specific applications.

[0045] Secondly, it should be noted that in the description of the embodiments of the present invention, terms such as "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0046] In addition, it should be noted that in the description of the embodiments of the present invention, unless otherwise clearly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be internal communication between two components. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0048] A heat pump dryer is a new type of clothing drying equipment that uses heat pump technology. A heat pump dryer usually includes a drying drum, a circulating air duct and a heat pump system. The drying drum has an air inlet and an air outlet connected to the circulating air duct. The heat pump system includes an evaporator and a condenser arranged in the circulating air duct, and the condenser is arranged close to the air inlet.

[0049] When the heat pump dryer is working, the air from the air outlet flows through the evaporator and condenser in sequence, and then enters the drying drum through the air inlet; the evaporator is used to liquefy the water vapor in the air entering the circulating air duct from the air outlet to dry the air in the circulating air duct; the condenser heats the air dried by the evaporator, so that the air entering the drying drum from the air inlet becomes dry hot air, which can dry the clothes in the drying drum.

[0050] When drying clothes in a clothes dryer, lint is generated. This lint is carried along with the air from the dryer drum into the circulating air duct and accumulates on the evaporator. To prevent this accumulation, a lint filter is installed in the circulating air duct between the air outlet and the evaporator. This filter is used to filter lint from the air.

[0051] However, the lint filter can only filter out larger lint in the air, but cannot filter out tiny lint, causing the tiny lint to still accumulate on the evaporator, reducing the heat exchange efficiency of the evaporator.

[0052] This embodiment provides a heat pump clothes dryer, which reduces the accumulation of lint on the evaporator by pouring condensed water generated by liquefying water vapor onto the evaporator. The condensed water attached to the evaporator flushes lint into a water tank during its downward flow, thereby improving the heat exchange efficiency of the evaporator.

[0053] The principles and features of the embodiments of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the embodiments of the present invention and are not used to limit the scope of the embodiments of the present invention.

[0054] like Figure 1 As shown, the heat pump dryer provided by the embodiment of the present invention includes: a shell 10 and a drying drum, a circulating air duct, a heat pump system and a cleaning system arranged in the shell 10. The drying drum has an air inlet and an air outlet connected to the circulating air duct. The heat pump system is arranged in the circulating air duct. The heat pump system includes an evaporator 20 and a condenser 30. The evaporator 20 is close to the air outlet, and the condenser 30 is arranged between the evaporator 20 and the air inlet.

[0055] like Figure 2 and Figure 3 As shown, the bottom of the housing 10 has a water tank 101 , and the evaporator 20 is arranged on the upper part of the water tank 101 . The water tank 101 is used to receive condensed water dripping from the evaporator 20 .

[0056] The cleaning system includes a drive device, a rotating shaft 402 in transmission connection with the drive device, and an impeller 403 extending through the rotating shaft 402. The drive device rotates the rotating shaft 402, which in turn drives the impeller 403. The rotating shaft 402 is rotatably connected to the housing 10. The impeller 403 is located in the water tank 101 and is configured to spray water in the water tank 101 onto the evaporator 20 when rotating.

[0057] Continue to refer to Figure 2 The driving device may include a motor 401, which is connected to one end of a rotating shaft 402. The motor 401 drives the rotating shaft 402 to rotate, thereby driving the impeller 403 to rotate.

[0058] Alternatively, the drive device may include a fixed rod, a connecting rod, and a handle. The centerline of the fixed rod is collinear with the axis of the rotating shaft 402. One end of the fixed rod is connected to one end of the rotating shaft 402. The connecting rod is perpendicular to the fixed rod, and one end of the connecting rod is connected to the fixed rod. The handle is perpendicular to the connecting rod and is located on the side of the connecting rod facing away from the fixed rod. During operation, the handle is held and rotated about the centerline of the fixed rod to rotate the rotating shaft 402, which in turn drives the impeller 403 to rotate.

[0059] The heat pump dryer in this embodiment includes a housing 10, an evaporator 20 disposed within the housing 10, and a cleaning system. The housing 10 has a water tank 101 at the bottom, and the evaporator 20 is disposed above the water tank 101. The cleaning system includes a drive device, a rotating shaft 402, and an impeller 403 disposed on the rotating shaft 402. The rotating shaft 402 is rotatably connected to the housing 10 and is in transmission connection with the drive device. The impeller 403 is located within the water tank 101 and is configured to spray water within the water tank 101 onto the evaporator 20 when rotating. Through the above arrangement, condensed water formed by the condensation of water vapor in the air at the evaporator 20 gathers in the water tank 101. When the impeller 403 rotates, the condensed water in the water tank 101 enters the impeller 403 from the axial direction of the impeller 403 and is thrown out to the evaporator 20 from the radial direction of the impeller 403. The condensed water on the evaporator 20 flushes the lint accumulated on the evaporator 20 into the water tank 101 during the downward flow, thereby reducing the lint accumulated on the evaporator 20 and increasing the contact area between the air and the evaporator 20, thereby improving the heat exchange efficiency of the evaporator 20.

[0060] like Figure 4 As shown, in some embodiments, the impeller 403 includes an auxiliary plate 404 connected to the rotating shaft 402, and a plurality of blades 405 vertically arranged on the auxiliary plate 404, and the plurality of blades 405 are arranged around the axis of the rotating shaft 402 at equal central angles.

[0061] The auxiliary plate 404 is perpendicular to the rotating shaft 402, and multiple blades 405 are vertically arranged on the same side of the auxiliary plate 404, and the multiple blades 405 are arranged at intervals. When the impeller 403 rotates, the condensed water in the water tank 101 enters the space surrounded by the multiple blades 405 along the axial direction of the impeller 403, and is thrown out from the gaps between the multiple blades 405 along the radial direction of the impeller 403, and drips onto the evaporator 20.

[0062] The impeller 403 may further include a reinforcement ring 406 . The reinforcement ring 406 is disposed at one end of the blade 405 away from the auxiliary plate 404 , and the reinforcement ring 406 is connected to each blade 405 .

[0063] One end of the blade 405 is connected to the auxiliary plate 404 , and the other end of the blade 405 is connected to the reinforcement ring 406 . The reinforcement ring 406 can further fix the blade 405 to make the blade 405 more stable.

[0064] One end of the blade 405 can be welded to the auxiliary plate 404, and the other end of the blade 405 can be welded to the reinforcement ring 406. Of course, the blade 405, the auxiliary plate 404 and the reinforcement ring 406 can also be integrally formed by injection molding.

[0065] In some embodiments, there are multiple impellers 403 , and the multiple impellers 403 are arranged at intervals along the axial direction of the rotating shaft 402 .

[0066] The side of the auxiliary plate 404 of each impeller 403 facing the blade 405 is all facing the same end of the rotating shaft 402, so that the condensed water in the water tank 101 has the same flow direction when entering the impeller 403, so as to avoid the opposite flow direction of the condensed water between adjacent impellers 403, which will cause the amount of condensed water entering the impeller 403 to be reduced, and then the amount of condensed water thrown onto the evaporator 20 will be reduced, thereby reducing the amount of wire chips flushed on the evaporator 20.

[0067] In some embodiments, the blades 405 are arc-shaped, and one of the adjacent blades 405 has a side facing the center of the circle opposite to the side of the other blade 405 facing away from the center of the circle. The arc-shaped blades 405 have a guiding effect on the condensed water thrown out along the radial direction of the impeller 403. The condensed water is thrown onto the evaporator 20 along the arc-shaped blades 405, thereby improving the utilization rate of the condensed water and thereby improving the flushing effect of the wire cuttings on the evaporator 20.

[0068] Continue to refer to Figure 2 and Figure 3 In the implementation mode in which a water tank 101 is provided at the bottom of the housing 10, a plurality of water retaining plates 102 are vertically provided at the bottom of the water tank 101, and the plurality of water retaining plates 102 are spaced apart in the direction from the air inlet to the air outlet.

[0069] The end of the water retaining plate 102 facing away from the bottom of the water tank 101 can be parallel to the horizontal plane. The air flow direction in the water tank 101 is from the air outlet to the air inlet. The water retaining plate 102 is used to block the condensed water in the water tank 101 and prevent the condensed water in the water tank 101 from flowing to the outside of the water tank 101 with the air.

[0070] Continue to refer to Figure 2 In some embodiments, the heat pump dryer further includes a drainage device. A drainage port 103 is provided on the drainage trough wall adjacent to the bottom of the water trough 101 . The drainage device is connected to the drainage port 103 and is used to extract water from the water trough 101 .

[0071] like Figure 5 As shown, the drainage device may include a water pump 50, the water inlet of the water pump 50 is connected to the drain outlet 103, and the water outlet of the water pump 50 may be connected to the sewer, so as to discharge the condensed water containing lint in the water tank 101 to the outside of the heat pump dryer.

[0072] Alternatively, the drainage device may further include a drainage pipe, one end of which is connected to the drain port 103, and the other end of which may be connected to the sewer, thereby discharging the condensed water containing lint in the water tank 101 out of the heat pump dryer.

[0073] The bottom of the drain port 103 may be located in the same plane as the bottom of the water tank 101 , so that the condensed water in the water tank 101 can be more easily discharged from the drain port 103 .

[0074] During the rotation of the impeller 403, the condensed water in the water tank 101 is disturbed, which increases the mobility of the lint and causes the lint to be discharged from the drain port 103 along with the condensed water, thereby preventing the lint from being retained in the water tank 101 for a long time and generating mold and odor.

[0075] Continue to refer to Figure 2 In some embodiments, a flow gap is provided between the water retaining plate 102 between the drain outlet 103 and the rotating shaft 402 and the drain groove wall at one end thereof. The condensed water in the water tank 101 at the lower part of the evaporator 20 flows along the flow gap to the drain outlet 103, thereby shortening the flow path of the condensed water from the lower part of the evaporator 20 to the drain outlet 103, so that the condensed water can be quickly discharged from the drain outlet 103.

[0076] Continue to refer to Figure 3In some embodiments, a flow gap may also be provided between the water retaining plate 102 between the end of the water trough 101 away from the rotating shaft 402 and the drain outlet 103, and the end of the water trough 101 away from the drainage trough wall and the trough wall. The trough walls are opposite to the drainage trough walls. The condensed water in the water trough 101 between the drain outlet 103 and the end of the water trough 101 away from the rotating shaft 402 flows along the flow gap to the drain outlet 103, so that all the condensed water in the water trough 101 flows to the drain outlet 103. At the same time, the water retaining plate 102 between the end of the water trough 101 away from the rotating shaft 402 and the drain outlet 103 can prevent the condensed water from continuing to flow toward the air inlet with the air.

[0077] Continue to refer to Figure 5 and Figure 6 In some embodiments, a mounting plate 104 is provided on the housing 10, the mounting plate 104 is parallel to the horizontal plane, and the evaporator 20 is provided on the mounting plate 104; a plurality of holes 105 (such as Figure 7 shown).

[0078] The hole 105 may be in an elongated shape, and the extending direction of the hole 105 may be parallel to the axis of the rotating shaft 402 . The plurality of holes 105 may be arranged in a grid-like manner so that the condensed water can easily pass through the holes 105 .

[0079] Of course, the hole 105 can also be in a circular, oval, square or other shapes. This embodiment does not limit the shape of the hole 105 as long as it can allow condensed water and wire scraps to pass through.

[0080] The condensed water thrown out from the impeller 403 passes through the hole 105 and reaches the evaporator 20. The condensed water carrying lint dripping from the evaporator 20 passes through the hole 105 and flows into the water tank 101, and is discharged from the drain port 103 to the outside of the heat pump dryer, thereby cleaning the lint on the evaporator 20.

[0081] A support plate 407 and a support column 408 (such as Figure 8 As shown), the support plate 407 is perpendicular to the mounting plate 104, and one end of the support plate 407 facing away from the mounting plate 104 is pressed against the bottom of the water tank 101 to support the mounting plate 104.

[0082] A plurality of support plates 407 may be provided, and the plurality of support plates 407 are arranged at intervals along the direction from the air inlet to the air outlet, so that the support plates 407 support the mounting plate 104 more stably.

[0083] The support column 408 is set on the side of the mounting plate 104 away from the evaporator. The center line of the support column 408 is perpendicular to the mounting plate 104. The end of the support column 408 away from the mounting plate 104 is against the bottom of the water tank 101 to support the mounting plate 104.

[0084] A plurality of support columns 408 may be provided, and the plurality of support columns 408 may be arranged at intervals so that the support columns 408 provide more stable support to the mounting plate 104 .

[0085] like Figure 9 As shown, in some embodiments, the bottom of the water tank 101 is inclined from the end away from the drainage tank wall toward the drainage tank wall, and the gap between the bottom of the water tank 101 and the mounting plate 104 gradually increases from the end away from the drainage tank wall toward the drainage tank wall, so that the condensed water in the water tank 101 flows along the inclined bottom to the drain outlet 103, thereby accelerating the discharge speed of the condensed water in the water tank 101.

[0086] In this embodiment, the height between the bottom of the water tank 101 and the horizontal plane gradually decreases from the end away from the drainage tank wall to the end close to the drainage tank wall. Therefore, the height between the liquid level of the condensed water in the water tank 101 and the bottom of the water tank 101 gradually increases from the end away from the drainage tank wall to the end close to the drainage tank wall. That is, the amount of water in the water tank 101 gradually increases from the end away from the drainage tank wall to the end close to the drainage tank wall. In order to make the amount of condensed water thrown to various parts of the evaporator 20 by the impeller 403 roughly the same, the gap between adjacent impellers 403 can be made to gradually increase from the end away from the drainage tank wall to the end close to the drainage tank wall (such as Figure 9 As shown), the amount of condensed water at one end of the water tank 101 away from the drainage tank wall is small, but the gaps between the corresponding impellers 403 are small, which can increase the amount of condensed water thrown onto the evaporator 20 corresponding to this part of the impeller 403; the amount of condensed water at one end of the water tank 101 close to the drainage tank wall is large, but the gaps between the corresponding impellers 403 are large, which can make the amount of condensed water at various locations on the evaporator 20 roughly consistent, so that the cleaning system can flush the wire scraps on the evaporator 20 more evenly.

[0087] Alternatively, the bottom of the water tank 101 may be parallel to the horizontal plane, and a plurality of impellers 403 may be arranged at equal intervals on the rotating shaft 402 so that the amount of condensed water thrown to various parts of the evaporator 20 by the impellers 403 is substantially the same.

[0088] Continue to refer to Figure 1 In an implementation in which the heat pump dryer includes a condenser 30 , the condenser 30 is disposed on the mounting plate 104 , and the condenser 30 is located on a side of the evaporator 20 facing the air inlet.

[0089] The water vapor in the air entering the circulating air duct is condensed at the evaporator 20. After dehumidification, the air reaches the condenser 30, which heats the air so that the air flowing through the condenser 30 becomes dry hot air. The dry hot air enters the dryer drum from the air inlet to dry the wet clothes in the dryer drum. The air discharged from the air outlet is humid air, which enters the circulating air duct again. This cycle continues until the clothes in the dryer drum are dried.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heat pump clothes dryer, characterized in that: include: An evaporator, a shell and a cleaning system, wherein the bottom of the shell has a water tank, and the evaporator is arranged on the upper part of the water tank; The cleaning system includes a driving device, a rotating shaft, and an impeller disposed on the rotating shaft. The rotating shaft is rotatably connected to the housing and is in transmission connection with the driving device. The impeller is located in the water tank and is used to spray water in the water tank onto the evaporator when rotating. There are multiple impellers, and the multiple impellers are arranged at intervals along the axis direction of the rotating shaft; The height between the bottom of the water trough and the horizontal plane gradually decreases from the end away from the drainage trough wall to the end close to the drainage trough wall; the gap between adjacent impellers gradually increases from the end away from the drainage trough wall to the end close to the drainage trough wall.

2. The heat pump dryer according to claim 1, characterized in that The impeller includes an auxiliary plate connected to the rotating shaft, and a plurality of blades vertically arranged on the auxiliary plate, and the plurality of blades are arranged around the axis of the rotating shaft at equal central angles.

3. The heat pump dryer according to claim 2, characterized in that: The impeller further includes a reinforcement ring, which is arranged at one end of the blade away from the auxiliary plate and is connected to each of the blades.

4. The heat pump dryer according to claim 2 or 3, characterized in that: The blades are arc-shaped.

5. The heat pump dryer according to any one of claims 1 to 3, characterized in that: The shell is provided with an air inlet and an air outlet, and the evaporator is located between the air inlet and the air outlet; the bottom of the shell forms the water trough, and the bottom of the water trough is vertically provided with multiple water retaining plates, and the multiple water retaining plates are arranged at intervals along the direction from the air inlet to the air outlet.

6. The heat pump dryer according to claim 5, characterized in that: The heat pump clothes dryer further comprises a drainage device. A drainage outlet is provided on the drainage trough wall adjacent to the bottom of the water trough. The drainage device is communicated with the drainage outlet and is used to extract water from the water trough.

7. The heat pump dryer according to claim 6, characterized in that A flow gap is defined between one end of the water retaining plate between the drain outlet and the rotating shaft and the drain groove wall.

8. The heat pump dryer according to any one of claims 1 to 3, characterized in that: A mounting plate is provided on the shell, the mounting plate is parallel to a horizontal plane, and the evaporator is provided on the mounting plate; a plurality of holes are provided on the mounting plate corresponding to the evaporator.

9. The heat pump dryer according to claim 8, characterized in that The heat pump clothes dryer further includes a condenser, which is disposed on the mounting plate and is located on a side of the evaporator facing the air inlet.

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