Heat pump drying system and heat pump washing and drying all-in-one machine

Abstract

The utility model provides a heat pump drying system and a heat pump washing and drying all-in-one machine, the heat pump drying system comprises a heat pump module, the heat pump module comprises a compressor and a two-device assembly, the two-device assembly comprises a condenser and an evaporator, a liquid outlet pipe of the condenser is provided with a to-be-cooled section, and the to-be-cooled section is connected with the compressor. And the to-be-cooled section is provided with a cooling structure for further reducing the temperature of a refrigerant entering the evaporator. The liquid outlet pipe of the condenser can be cooled through the spraying device, so that the temperature of a refrigerant in the liquid outlet pipe is reduced, and the refrigeration effect of the two-device assembly on the compressor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pump integrated washer-dryers, and more specifically, to a heat pump drying system and a heat pump integrated washer-dryer. Background Art

[0002] The heat pump washer-dryer has a small volume of two devices, which causes the compressor to run at too high a temperature. Especially under high temperature conditions, the compressor frequency reduction or shutdown protection time is extended, resulting in higher compressor temperature, which will affect the normal operation of the compressor.

[0003] In the prior art, a cooling fan is added to cool the compressor by blowing directly at it. However, the cooling effect of the cooling fan is limited. Under high temperature conditions or when the compressor generates a lot of heat, the effect of the cooling fan is not obvious, and the refrigerant temperature in the condenser cannot be effectively reduced, resulting in the refrigerant temperature entering the compressor liquid cooling pipeline is not low enough. It can only slow down the temperature rise rate of the compressor, but cannot effectively solve the cooling problem of the compressor, affecting the normal operation of the compressor. Utility Model Content

[0004] The present application is based on the utility model's discovery and understanding of the following problems and facts: the heat dissipation effect of the heat dissipation fan is limited. Under high temperature conditions, it can only slow down the temperature rise of the compressor, but cannot effectively solve the problem of cooling, causing the temperature of the refrigerant entering the compressor liquid cooling pipeline to be high, affecting the normal operation of the compressor.

[0005] The utility model aims to solve one of the above technical problems at least to a certain extent.

[0006] According to a first aspect of the present disclosure, a heat pump drying system is provided, which is provided with a heat pump module, the heat pump module includes a compressor and two-device components, the two-device components include a condenser and an evaporator, and the liquid outlet pipe of the condenser is provided with a cooling structure for further reducing the temperature of the refrigerant entering the evaporator.

[0007] In some embodiments, the cooling structure is a condensate cooling structure, the condensate cooling structure is provided with a condensate inlet pipe, the two-device assembly is also provided with a water guide groove capable of receiving the condensate of the evaporator, the liquid outlet pipe has a section to be cooled, the section to be cooled of the condenser is located in the water guide groove, and the condensate inlet pipe is connected to the water guide groove.

[0008] In some embodiments, the cooling structure is a condensation water cooling structure, the condensation water cooling structure is provided with a spray device, the liquid outlet pipe of the condenser has a section to be cooled, the spray device includes a water inlet pipe and a spray head, the water inlet pipe is used to connect to an external water source, the spray head is connected to the water inlet pipe, the spray head extends in the same direction as the section to be cooled, and the spray head is used to spray the section to be cooled.

[0009] In some embodiments, the shower head has a plurality of nozzles arranged in a strip shape, and the arrangement direction of the nozzles is parallel to the section to be cooled.

[0010] In some embodiments, the section to be cooled has a preset inclination angle relative to the horizontal direction, and the liquid inlet end of the section to be cooled is higher than the liquid outlet end.

[0011] In some embodiments, the preset tilt angle is 2° to 5°.

[0012] In some embodiments, it also includes: the section to be cooled is a flat tube structure adapted to the shower head.

[0013] In some embodiments, the heat pump drying system is provided with a controller, and the controller has the function of controlling the amount of condensed water supplied to the cooling structure according to the compressor exhaust temperature and / or the evaporator temperature.

[0014] In some embodiments, a water valve, a first temperature sensor, and a second temperature sensor;

[0015] The water valve is arranged on the cooling structure, the first temperature sensor is arranged at the exhaust port of the compressor, and the second temperature sensor is arranged in the middle of the evaporator;

[0016] The controller controls the water valve to be closed, opened, or intermittently switched based on the temperature signals from the first temperature sensor and the second temperature sensor.

[0017] According to an embodiment of the second aspect of the utility model, a heat pump washer-dryer is provided, comprising: the aforementioned heat pump drying system.

[0018] In some embodiments, the cooling and temperature reduction structure is connected to a water inlet valve of the heat pump washer-dryer, and the cooling and temperature reduction structure is connected to an external water source through the water inlet valve.

[0019] According to an embodiment of the third aspect of the utility model, a control method for a heat pump washer-dryer is provided, comprising: obtaining an exhaust temperature T of a compressor;

[0020] The cooling intensity of the liquid outlet pipe of the condenser is adjusted according to the exhaust gas temperature T.

[0021] In some embodiments, adjusting the cooling intensity of the condenser liquid outlet pipe according to the exhaust temperature T includes:

[0022] If the exhaust temperature T> the first preset value T A , the sprinkler is turned on for time t and turned off for time t:

[0023] If the exhaust temperature T> the second preset value T B , the sprinkler is turned on for t time and turned off for t time;

[0024] Among them, T A <T B , t<t and / or t>t.

[0025] In some embodiments, adjusting the cooling intensity of the condenser liquid outlet pipe according to the exhaust temperature T further includes:

[0026] If the exhaust temperature T≤ the first preset value T A , then obtain the temperature T of the evaporator;

[0027] If T>the third preset value T C , the sprinkler is turned on for t time and turned off for t time;

[0028] If T≤ the third preset value T C , the sprinkler is closed.

[0029] According to the heat pump drying system of the embodiment of the utility model, the liquid outlet pipe of the evaporator is extended so that the liquid outlet pipe has a cooling section. Cooling water is sprayed on the surface of the cooling section through a spray head. The heat of the surface of the liquid outlet pipe can be carried away by the cooling water, thereby reducing the temperature of the refrigerant circulating in the liquid outlet pipe and improving the cooling effect of the two components on the compressor.

[0030] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram according to an embodiment of the utility model;

[0032] Figure 2 is a schematic structural diagram of a spray device according to an embodiment of the utility model;

[0033] Figure 3 It is a flow chart of a control method according to an embodiment of the utility model.

[0034] Reference numerals

[0035] 1. Condenser; 2. Evaporator; 3. Liquid outlet pipe; 301. Section to be cooled; 4. Water inlet pipe; 5. Sprinkler head; 501. Nozzle. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0037] Throughout the specification and claims, the following terms have at least the meanings explicitly associated herein, unless the context dictates otherwise. The meanings identified below do not necessarily limit the terms, but merely provide illustrative examples of the terms.

[0038] In the description of the utility model, the phrase "in one embodiment" does not necessarily refer to the same embodiment, although it may refer to the same embodiment. Similarly, the phrase "in some embodiments" as used herein, when used multiple times, does not necessarily refer to the same embodiment, although it may refer to the same embodiment. As used herein, the term "or" is an inclusive "or" operator and is equivalent to the term "and / or", unless the context clearly dictates otherwise. The term "based on" is not exclusive and allows for additional factors not described, unless the context clearly dictates otherwise. The word "exemplary" means "used as an example, instance or illustration" in this article. Any embodiment described as "exemplary" herein is not necessarily interpreted as being superior or superior to other embodiments. The scope of the utility model is limited only by the scope of the appended claims, and any examples set forth in this specification are not intended to be limiting, but only to set forth some of the many possible embodiments of the utility model claimed for protection. The various embodiments provided by the utility model should not be interpreted as limiting the scope of protection of the utility model.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0043] With the improvement of people's living standards, heat pump washer-dryers have long become one of the indispensable household appliances in daily life.

[0044] On the one hand, the heat pump washer-dryer in the prior art has multiple functions such as washing or drying. The heat pump washer-dryer with drying function can be a heat pump washer-dryer, which heats the air through a heat pump, turning the air into dry wind to take away moisture from the clothes to be dried. However, in the drying system, the compressor needs to be cooled by two components to ensure the normal operation of the compressor.

[0045] In the process of the two-device assembly cooling the compressor, the heat generated by the compressor will be taken away by the refrigerant. When the refrigerant circulates in the condenser in the two-device assembly, the refrigerant is cooled by the heat dissipation fan. However, the heat dissipation effect of the heat dissipation fan is limited. Under high temperature conditions or when the compressor generates a large amount of heat, the effect of the heat dissipation fan is not obvious, and the refrigerant temperature in the condenser cannot be effectively reduced, resulting in the refrigerant temperature entering the compressor liquid cooling pipeline not being low enough. It can only slow down the temperature rise of the compressor, but cannot effectively solve the cooling of the compressor, affecting the normal operation of the compressor.

[0046] Embodiment 1

[0047] Based on this, Figure 1-Figure 2As shown, the heat pump drying system according to the embodiment of the utility model includes: it is provided with a heat pump module, the heat pump module includes a compressor and two-device components, the two-device components include a condenser 1 and an evaporator 2, and the liquid outlet pipe of the condenser 1 is provided with a condensed water cooling structure for further reducing the temperature of the refrigerant entering the evaporator.

[0048] The liquid outlet pipe 3 of the condenser 1 has a cooling section 301, and the cooling section 301 is provided with a cooling structure for reducing the temperature of the refrigerant entering the evaporator;

[0049] Specifically, the two-device assembly includes: a condenser 1, an evaporator 2 and a spray device;

[0050] The condensed water cooling structure is provided with a spray device;

[0051] The evaporator 2 and the condenser 1 are connected through a refrigerant pipeline, and the condenser 1 has a liquid outlet pipe 3, which is connected to the liquid cooling pipeline of the compressor;

[0052] Among them, the liquid outlet pipe 3 of the condenser 1 has a section to be cooled 301, and the spraying device includes a water inlet pipe 4 and a spray head 5. The water inlet pipe 4 is used to connect with an external water source, and the spray head 5 is connected to the water inlet pipe 4. The spray head 5 extends in the same direction as the section to be cooled 301, and the spray head 5 is used to spray the section to be cooled 301.

[0053] Specifically, the two-device assembly includes a condenser 1 and an evaporator 2. The two-device components can provide a refrigerant with a lower temperature for the liquid cooling pipeline of the compressor. The refrigerant takes away the heat generated by the compressor through the liquid cooling pipeline to cool the compressor.

[0054] The two-device assembly also includes a spray device, which supplies water to the spray head 5 through the water inlet pipe 4, and the spray head 5 then sprays cooling water onto the to-be-cooled section 301 of the liquid outlet pipe 3. While the cooling water flows on the to-be-cooled section 301, it can exchange heat with the to-be-cooled section 301, taking away part of the heat of the refrigerant in the liquid outlet pipe 3, performing secondary cooling for the refrigerant, reducing the temperature of the refrigerant entering the liquid cooling pipeline of the compressor, improving the cooling intensity of the compressor, and avoiding excessively high temperature of the compressor, which affects the normal operation of the compressor.

[0055] The section to be cooled 301 may be a section of the liquid outlet pipe 3 , which has a certain length and can provide sufficient flow time for the cooling water so that the cooling water can fully exchange heat with the liquid outlet pipe 3 .

[0056] According to the heat pump drying system of the embodiment of the utility model, the liquid outlet pipe 3 of the evaporator 2 is extended so that the liquid outlet pipe 3 has a cooling section 301, and cooling water is sprayed on the surface of the cooling section 301 through the spray head 5. The heat on the surface of the liquid outlet pipe 3 can be carried away by the cooling water, thereby reducing the temperature of the refrigerant circulating in the liquid outlet pipe 3, thereby improving the cooling effect of the two components on the compressor.

[0057] In some embodiments, the shower head 5 has a plurality of nozzles arranged in a strip shape, and the arrangement direction of the nozzles is parallel to the to-be-cooled section 301 .

[0058] Specifically, the spray head 5 can be a strip spray head 5 extending along a straight line, the nozzles can be evenly arranged along the straight line, and there can be two rows of nozzles. The section to be cooled 301 and the spray head 5 can be parallel to each other, and the nozzles are also evenly arranged above the section to be cooled 301. The cooling water sprayed from the nozzles can flow along the surface of the section to be cooled 301 after dripping onto the surface of the section to be cooled 301, and exchange heat with the section to be cooled 301 during the flow process, thereby reducing the temperature of the refrigerant in the section to be cooled 301 and improving the cooling intensity of the compressor.

[0059] In some embodiments, the section to be cooled 301 has a preset inclination angle relative to the horizontal direction, and the liquid inlet end of the section to be cooled 301 is higher than the liquid outlet end.

[0060] Specifically, the cooling section 301 and the spray head 5 can form a certain inclination angle with the horizontal plane, which is a preset inclination angle. The cooling section 301 is inclined and the liquid inlet end is higher than the liquid outlet end, so that the cooling water and the refrigerant can flow a certain distance, thereby increasing the heat exchange time between the cooling water and the refrigerant and improving the effect of cooling the refrigerant.

[0061] In some embodiments, the preset tilt angle is 2° to 5°.

[0062] Specifically, 2° to 5° is a preferred value, which allows the cooling water to adhere to the section to be cooled 301 and flow from high to low along the section to be cooled 301 without directly dripping from the section to be cooled 301 .

[0063] In some embodiments, the to-be-cooled section 301 is a flat tube structure adapted to the shower head 5 .

[0064] Specifically, the section to be cooled 301 may be a flat tube, and a wider side of the flat tube is opposite to the spray head 5 , which can increase the contact between the flat tube and the cooling water, thereby improving the cooling effect of the cooling water on the refrigerant in the section to be cooled 301 .

[0065] In some embodiments, it also includes: a shell; the bottom of the shell has a drainage groove.

[0066] Specifically, the cooling water flows along the to-be-cooled section 301, and after reaching the lowest point of the cooling section, it drips to the bottom of the shell under the action of gravity, and is finally discharged from the drainage groove of the shell, thereby avoiding water accumulation in the shell.

[0067] In some embodiments, it further includes: a control module;

[0068] The control module includes: a controller, a water valve, a first temperature sensor and a second temperature sensor;

[0069] The water valve is arranged on the water inlet pipe 4, the first temperature sensor is arranged at the exhaust port of the compressor, and the second temperature sensor is arranged in the middle of the evaporator 2;

[0070] The controller controls the water valve to be closed, opened, or intermittently switched based on the temperature signals from the first temperature sensor and the second temperature sensor.

[0071] Specifically, the controller can be electrically connected to the water valve, the first temperature sensor and the second temperature sensor respectively. The first temperature sensor and the second temperature sensor are respectively arranged at the exhaust port of the compressor and the middle of the evaporator 2, and the exhaust temperature of the compressor and the temperature of the evaporator 2 can be obtained respectively.

[0072] Embodiment 2

[0073] The embodiment of the present application also provides a heat pump washer-dryer, comprising: a compressor and the aforementioned two-device assembly;

[0074] The liquid outlet pipe 3 of the condenser 1 of the two-device assembly is connected to the liquid cooling pipeline of the compressor.

[0075] Specifically, the two-device assembly can deliver the cooled refrigerant to the liquid cooling pipeline of the compressor to cool the compressor inlet line, prevent the compressor from overheating, affect the normal operation of the compressor, reduce the performance of the compressor, and even affect the service life of the compressor.

[0076] In some embodiments, the water inlet pipe 4 is connected to the water inlet valve of the heat pump washer-dryer, and the water inlet pipe 4 is connected to an external water source through the water inlet valve.

[0077] Specifically, the water inlet pipe 4 can be directly connected to the water inlet valve of the heat pump washer-dryer, and share a water inlet valve with other systems of the heat pump washer-dryer. The water inlet valve can be provided with multiple water supply ports with controllable switches, and the water inlet pipe 4 is connected to one of them. There is no need to add additional water channels for the heat pump washer-dryer to interact with the outside world, which can facilitate user installation and ensure the user experience.

[0078] Embodiment 3

[0079] like Figure 3As shown, the embodiment of the present application also provides a control method for a heat pump washer-dryer, comprising: obtaining an exhaust temperature T1 of a compressor;

[0080] The cooling intensity of the liquid outlet pipe 3 of the condenser 1 is adjusted according to the exhaust gas temperature T1.

[0081] Specifically, the temperature of the compressor can be obtained in real time through the first temperature sensor, and the temperature signal can be received through the controller to adjust the cooling intensity of the refrigerant in the two-device assembly according to the temperature of the compressor. That is, the cooling intensity of the liquid outlet pipe 3 of the condenser 1 is controlled by the spray device, and the cooling intensity of the two-device assembly on the compressor is adjusted.

[0082] In some embodiments, adjusting the cooling intensity of the liquid outlet pipe 3 of the condenser 1 according to the exhaust gas temperature T1 includes:

[0083] If the exhaust temperature T1> the first preset value TA, the spray device is turned on for time t1 and closed for time t2:

[0084] If the exhaust temperature T1> the second preset value TB, the spray device is turned on for time t3 and turned off for time t4;

[0085] Among them, TA<TB, t1<t3 and / or t2>t4.

[0086] Specifically, in order to control the temperature of the compressor, two cooling intensities, low-intensity cooling and high-intensity cooling, can be set. When the exhaust temperature of the compressor is low, low-intensity cooling is used, and the time for the spray device to alternately switch on and off can be adjusted, so that the spray device is turned on for less time and turned off for more time. When the exhaust temperature of the compressor is high, high-intensity cooling is used, and the time for the spray device to alternately switch on and off can be adjusted, so that the spray device is turned on for more time and turned off for less time. Then, the cooling intensity of the compressor can be adjusted according to the exhaust temperature of the compressor to keep the exhaust temperature of the compressor within a reasonable range, thereby avoiding the compressor temperature being too high and affecting the normal operation of the compressor, and also avoiding the compressor exhaust temperature being too low and affecting the drying effect of the clothes to be dried in the heat pump washer-dryer.

[0087] In some embodiments, adjusting the cooling intensity of the liquid outlet pipe 3 of the condenser 1 according to the exhaust gas temperature T1 further includes:

[0088] If the exhaust temperature T1 ≤ the first preset value TA, the temperature T2 of the evaporator 2 is obtained;

[0089] If T2> the third preset value TC, the spray device is turned on for time t3 and turned off for time t4;

[0090] If T2 ≤ the third preset value TC, the spray device is turned off.

[0091] Specifically, under high temperature conditions, the exhaust temperature of the compressor may not be high, but the temperature of the evaporator 2 in the two-device assembly may be too high. Continuous high-load operation of the evaporator 2 will affect the service life of the evaporator 2, that is, when the exhaust temperature of the compressor is low, the temperature of the evaporator 2 is detected by the second temperature sensor. If the temperature of the evaporator 2 is greater than the third preset value, the spray device is turned on, and high-intensity cooling is used to reduce the temperature of the refrigerant in the liquid outlet pipe 3, thereby reducing the temperature of the refluxed refrigerant and reducing the load on the evaporator 2. If the exhaust temperature is not high and the temperature of the evaporator 2 is not high, the spray device can be turned off to stop cooling the liquid outlet pipe 3 by the spray device to avoid the exhaust temperature of the compressor being too low, which affects the drying effect of the drying air on the clothes to be dried.

[0092] Embodiment 4

[0093] According to the heat pump drying system of the embodiment of the utility model, the condensate cooling structure is provided with a condensate inlet pipe, and the two-device components are also provided with a water guide groove capable of receiving condensate from the evaporator, the liquid outlet pipe has a section to be cooled, the section to be cooled of the condenser is located in the water guide groove, and the condensate inlet pipe is connected to the water guide groove.

[0094] Specifically, the two-device assembly may include a shell, a condenser 1, an evaporator 2 and a water supply pipe;

[0095] The condenser 1 and the evaporator 2 are arranged in a shell, the evaporator 2 and the condenser 1 are connected through a refrigerant pipeline, the condenser 1 has a liquid outlet pipe 3, the bottom of the shell has a water guide groove, one end of the water guide groove is used for drainage, the liquid outlet pipe 3 of the condenser 1 has a section to be cooled 301, the section to be cooled 301 is arranged in the water guide groove, one end of the water supply pipe is used to connect with an external water source, and the other end is connected in the water guide groove.

[0096] Specifically, the cooling of the liquid outlet pipe 3 of the evaporator 2 in the two-device assembly can also be achieved through the water guide groove and the water supply pipe. The cooling water continuously enters the water guide groove through the water supply pipe and then flows out of the water guide groove. During the continuous flow of the cooling water in the water guide groove, it can exchange heat with the cooling section 301, thereby reducing the temperature of the refrigerant in the liquid outlet pipe 3 and improving the cooling effect on the compressor.

[0097] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0098] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A heat pump drying system, comprising a heat pump module, the heat pump module comprising a compressor and two-device components, the two-device components comprising a condenser (1) and an evaporator (2), characterized in that: The liquid outlet pipe (3) of the condenser (1) has a section to be cooled (301), and the section to be cooled (301) is provided with a cooling structure for reducing the temperature of the refrigerant entering the evaporator.

2. The heat pump drying system according to claim 1, characterized in that: The cooling structure is a condensate cooling structure, and the condensate cooling structure is provided with a condensate inlet pipe. The two-device assembly is also provided with a water guide groove capable of receiving the condensate of the evaporator. The cooling section (301) of the condenser is located in the water guide groove, and the condensate inlet pipe is connected to the water guide groove.

3. The heat pump drying system according to claim 1, characterized in that: The cooling structure is a condensation water cooling structure, and the condensation water cooling structure is provided with a spray device, and the spray device comprises a water inlet pipe (4) and a spray head (5), the water inlet pipe (4) is used to communicate with an external water source, the spray head (5) is connected to the water inlet pipe (4), the spray head (5) and the section to be cooled (301) extend in the same direction, and the spray head (5) is used to spray the section to be cooled (301).

4. The heat pump drying system according to claim 3, characterized in that: The spray head (5) has a plurality of nozzles arranged in a strip shape, and the arrangement direction of the nozzles is parallel to the section to be cooled (301).

5. The heat pump drying system according to claim 4, characterized in that: The section to be cooled (301) has a preset inclination angle relative to the horizontal direction, and the liquid inlet end of the section to be cooled (301) is higher than the liquid outlet end.

6. The heat pump drying system according to claim 5, characterized in that: The preset inclination angle is 2° to 5°.

7. The heat pump drying system according to claim 5, characterized in that: The section to be cooled (301) is a flat tube structure adapted to the spray head (5).

8. The heat pump drying system according to any one of claims 1 to 7, characterized in that: The heat pump drying system is provided with a controller, which has the function of controlling the amount of condensed water supplied to the cooling structure according to the compressor exhaust temperature and / or the evaporator temperature.

9. The heat pump drying system according to claim 8, characterized in that: Also includes: A water valve, a first temperature sensor and a second temperature sensor; The water valve is arranged on the cooling structure, the first temperature sensor is arranged at the exhaust port of the compressor, and the second temperature sensor is arranged in the middle of the evaporator (2); The controller controls the water valve to be closed, opened, or intermittently switched based on the temperature signals from the first temperature sensor and the second temperature sensor.

10. A heat pump washer-dryer, characterized in that: include: A heat pump drying system as described in any one of claims 1 to 9.

11. The heat pump washer-dryer according to claim 10, characterized in that: The cooling and temperature reduction structure is communicated with a water inlet valve of the heat pump washer-dryer, and the cooling and temperature reduction structure is communicated with an external water source through the water inlet valve.

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