Heat exchange system of heat pump clothes dryer and heat pump clothes dryer

Abstract

The invention discloses a heat exchange system of a heat pump clothes dryer and the heat pump clothes dryer, the heat exchange system of the heat pump clothes dryer comprises a drying air duct, an evaporator and a condenser which are located in the drying air duct and arranged along the drying air duct at intervals, and a semiconductor electric heating device which is provided with a heat exchange end, the heat exchange end can be switched between a heating working mode and a refrigerating working mode by controlling the direction of current flowing through the semiconductor electric heating device; the heat exchange end is arranged in the drying air channel and located between the evaporator and the condenser. The semiconductor electric heating device is arranged between the evaporator and the condenser, so that the effects of assisting the condenser in heating in the preheating stage, shortening the duration of the preheating stage, assisting the evaporator in refrigerating in the steady-state stage and enhancing dehumidification are achieved at low cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of clothes dryers, and in particular, relates to a heat exchange system of a heat pump clothes dryer and a heat pump clothes dryer. Background Art

[0002] Among clothes dryers, the heat pump technology of heat pump dryers is the most effective way to save energy in the process of drying clothes, and the drying effect is better. Therefore, heat pump dryers have been widely used and have broad market prospects.

[0003] The drying process of the heat pump dryer is as follows: the low-temperature heat energy in the air is absorbed by the refrigerant, and after being compressed and converted by the heat pump system including the compressor, high-temperature heat energy is generated. The heat pump system includes two operating stages, namely the preheating stage and the steady-state stage. The preheating stage is the initial stage after the compressor is started, in which a certain time is required to reach the steady-state stage of the full working state in terms of temperature and pressure. When the heat pump system is started, the temperature of the air and the refrigerant is at the ambient temperature. In the preheating stage, the temperature of the air and the refrigerant is increased to the desired level. In the steady-state stage, the temperature of the air and the refrigerant remains static and constant.

[0004] At present, the compressors used in heat pump dryers are usually fixed-frequency compressors and variable-frequency compressors. The working principles of these two compressors determine that their preheating stage requires a long period of time, resulting in the preheating stage duration accounting for too large a proportion of the total drying time, which in turn leads to too long a total drying time. In addition, after these two compressors have been in the steady-state stage for a long time, due to their energy consumption limitations and the temperature rise of the compressor's evaporator, the evaporator's cooling and dehumidification effect on the drying air is reduced, which in turn causes the moisture content of the clothes to drop from 8% to the national standard for clothes moisture content of ±3%, and the required time and energy consumption will increase significantly.

[0005] Therefore, how to improve the heat pump system of the heat pump dryer, shorten the duration of its preheating phase at a lower cost, and enhance the dehumidification effect in the steady-state phase is a technical problem that needs to be solved.

[0006] In view of this, the present invention is proposed. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a heat exchange system and a heat pump dryer for a heat pump dryer. By arranging a semiconductor electric heating device between the evaporator and the condenser, it is possible to assist the condenser in heating during the preheating stage at a lower cost, shorten the duration of the preheating stage, assist the evaporator in cooling during the steady-state stage, and enhance the dehumidification effect.

[0008] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0009] The present invention provides a heat exchange system of a heat pump clothes dryer, comprising a drying air duct, and an evaporator and a condenser located inside the drying air duct and arranged at intervals along the drying air duct, and further comprising:

[0010] A semiconductor electric heating device having a heat exchange end, which can be switched between heating and cooling working modes by controlling the direction of current flowing through the semiconductor electric heating device;

[0011] The heat exchange end is arranged in the drying air duct and is located between the evaporator and the condenser.

[0012] The present invention arranges a semiconductor electric heating device between the evaporator and the condenser, thereby assisting the condenser in heating during the preheating stage at a relatively low cost, shortening the duration of the preheating stage, and assisting the evaporator in cooling during the steady-state stage, thereby enhancing the dehumidification effect.

[0013] A further solution of the present invention is that the heat exchange end includes a plurality of heat exchange fins arranged parallel to the air flow direction in the drying air duct.

[0014] In the above scheme, the heat exchange efficiency between the airflow and the heat exchange end is improved by the heat exchange fins, thereby enhancing the heating and cooling effects.

[0015] A further solution of the present invention is: the evaporator comprises a heat exchange fin, and the heat exchange fin is arranged parallel to the heat exchange fin.

[0016] In the above scheme, when the airflow in the drying duct passes through the heat exchange plate of the evaporator and the heat exchange fins, the contact area with the heat exchange fins can be larger and the heat exchange is more sufficient, thereby further improving the heat exchange efficiency between the airflow and the heat exchange end and enhancing the heating and cooling effects.

[0017] A further solution of the present invention is that a plurality of heat exchange fins are arranged in the drying air duct, and the intervals between two adjacent heat exchange fins are equal.

[0018] In the above solution, it is ensured that the multiple heat exchange fins can perform sufficient and uniform heat exchange on the airflow.

[0019] A further solution of the present invention is: a shell is used to enclose the drying air duct, and an opening is arranged on the top wall of the shell;

[0020] The semiconductor electric heating device passes through the opening and is sealedly connected to the opening, so that the heat exchange end is installed inside the drying air duct.

[0021] In the above solution, the semiconductor electric heating device is added to the shell at a relatively low cost.

[0022] A further solution of the present invention is that: the semiconductor electric heating device further has a heat exchange end located outside the shell;

[0023] When the heat exchange end is in a heating working mode, the heat exchange end absorbs external heat; when the heat exchange end is in a cooling working mode, the heat exchange end dissipates heat outward.

[0024] In the above solution, the heat exchange end of the semiconductor electric heating device is located outside the shell, so that the semiconductor electric heating device will not cool and heat the airflow of the drying air duct at the same time when it is working.

[0025] A further solution of the present invention is: the heat exchange end includes a plurality of heat exchange fins, and the heat exchange fins are extended outward from the top of the shell.

[0026] In the above scheme, the heat exchange efficiency of the heat exchange end of the semiconductor electric heating device is made higher through multiple heat exchange fins, thereby increasing the heating temperature of the heat exchange end, or reducing the cooling temperature of the heat exchange end, so that it can perform better heat exchange.

[0027] A further solution of the present invention is: the heat exchange system of the heat pump dryer further includes:

[0028] A fan, arranged at the air inlet of the housing, for driving air to flow along the drying air duct;

[0029] The heat exchange end includes a plurality of heat exchange fins arranged parallel to the air flow direction in the drying air duct;

[0030] The plane where the air inlet of the shell is located is perpendicular to the plane where the heat exchange fins are located.

[0031] In the above scheme, by making the airflow pass through the heat exchange fins more smoothly and quickly, the heat exchange efficiency between the airflow and the heat exchange end is further improved, thereby enhancing the heating and cooling effects.

[0032] A further solution of the present invention is that the air inlet of the housing and the air outlet of the housing are arranged alternately and in parallel;

[0033] The drying air duct is formed between the plane where the air inlet is located and the plane where the air outlet is located, and the air flow direction is perpendicular to the air inlet and the air outlet.

[0034] In the above scheme, the airflow is further enabled to pass through the heat exchange fins more smoothly and quickly, thereby further improving the heat exchange efficiency between the airflow and the heat exchange end, and enhancing the heating and cooling effects.

[0035] The present invention further provides a heat pump clothes dryer, and the heat pump clothes dryer comprises the heat exchange system of the heat pump clothes dryer.

[0036] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art.

[0037] 1. By placing the semiconductor electric heating device between the evaporator and the condenser, the condenser can be assisted in heating in the preheating stage at a lower cost, shortening the duration of the preheating stage, and assisting the evaporator in cooling in the steady state stage, thereby enhancing the dehumidification effect;

[0038] 2. By arranging the heat exchange sheet parallel to the heat exchange fins, the heat exchange efficiency between the airflow and the heat exchange end is further improved, thereby enhancing the heating and cooling effects.

[0039] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0041] Figure 1 It is a schematic structural diagram of a heat exchange system of a heat pump clothes dryer without a shell in one embodiment of the present invention;

[0042] Figure 2 is a schematic structural diagram of the bottom of a drying drum of a heat exchange system of a heat pump clothes dryer according to another embodiment of the present invention;

[0043] Figure 3 It is a structural schematic diagram of a drying drum bottom without a shell of a heat exchange system of a heat pump clothes dryer of the present invention.

[0044] In the figure: 1. drying drum; 11. drying drum opening wall; 21. air inlet channel; 22. air outlet channel; 23. fan; 3. compressor system; 31. shell; 32. compressor; 33. evaporator; 331. heat exchange fin; 332. heat absorption pipe; 34. condenser; 341. heat exchange plate; 342. heat release pipe; 4. semiconductor electric heating device; 41. heat exchange fin; 42. connection part; 43. heat exchange fin.

[0045] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0047] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] like Figures 1 to 3 As shown, the present invention provides a heat exchange system and a heat pump dryer of a heat pump dryer. By arranging a semiconductor electric heating device 4 between the evaporator 33 and the condenser 34, the condenser 34 is assisted in heating in the preheating stage at a relatively low cost, the duration of the preheating stage is shortened, and the evaporator 33 is assisted in cooling in the steady-state stage to enhance the dehumidification effect.

[0050] Embodiment 1

[0051] like Figures 1 to 3 As shown, this embodiment provides a heat exchange system of a heat pump dryer, including a drying air duct, and an evaporator 33 and a condenser 34 located inside the drying air duct and arranged at intervals along the drying air duct, and also includes: a semiconductor electric heating device 4, having a heat exchange end, and the heat exchange end can be switched between heating and cooling working modes by controlling the direction of current flowing through the semiconductor electric heating device 4; the heat exchange end is arranged in the drying air duct, between the evaporator 33 and the condenser 34.

[0052] In detail, the semiconductor electric heating device 4 utilizes the Peltier effect. In a forward current, the heat exchange end emits heat to generate heat, and in a reverse current, the heat exchange end absorbs heat to generate cooling. The Peltier effect is specifically: since the charge carriers are at different energy levels in different materials, when it moves from a high energy level to a low energy level, it releases excess energy; conversely, when it moves from a low energy level to a high energy level, it absorbs energy from the outside. In a specific embodiment, the switching between the heating and cooling working modes of the heat exchange end is achieved by interchangeably connecting the positive current and the negative current of the semiconductor electric heating device 4.

[0053] In detail, the heat pump system 3 of the heat pump clothes dryer includes the evaporator 33, the condenser 34 and the compressor. The working principle of the heat pump system 3 is as follows: the air in the drying drum 1 is sucked into the drying air duct through the air inlet channel 21 by a fan or an exhaust device, and in the drying air duct, the air passes through the evaporator 33, the semiconductor electric heating device 4 and the condenser 34 in sequence. The refrigerant in the evaporator 33 absorbs heat in the process of contacting with the wet and cold air, and turns the wet hot air into dry cold air. After the refrigerant is further pressurized and heated by the compressor 32, it flows into the condenser 34. The refrigerant releases heat in the condenser 34, and the dry cold air is converted into dry hot air, and then the dry hot air is used to heat the clothes in the drying drum 1 and take away the moisture in the clothes. After the refrigerant flows out of the condenser 34 and is cooled, it flows into the evaporator 33.

[0054] According to the working principle of the heat pump system 3, it can be known that in the preheating stage of the heat pump system 3, the refrigerant needs to be heated and sent to the condenser 34, and the time required for the refrigerant to heat up to a higher set temperature is relatively long. At this time, since the semiconductor electric heating device 4 generates heat using electric energy, its heating speed is much faster than that of the condenser 34. Therefore, the dry cold air passing through the evaporator 33 is preheated by heating at the heat exchange end of the semiconductor electric heating device 4, so that it assists the condenser 34 in heating, thereby improving the drying effect of the preheating stage and greatly shortening the duration of the preheating stage.

[0055] According to the working principle of the above-mentioned heat pump system 3, it can be known that after the heat pump system 3 passes through the preheating stage and runs for a period of time in the steady state stage, the temperature of the surface of the evaporator 33 increases, and the heat absorption efficiency of the evaporator 33 decreases. At this time, the evaporator 33 is refrigerated by assisting the evaporator 33 through the cooling of the heat exchange end of the semiconductor electric heating device 4, so that the humid air is cooled and condensed, and the water is separated from the gas, thereby reducing the partial pressure of water vapor in the drying drum 1, making it easier for the water absorbed by the clothing fibers to evaporate, thereby enhancing the dehumidification effect and effectively shortening the time required for the steady state stage.

[0056] Therefore, by arranging the semiconductor electric heating device 4 between the evaporator 33 and the condenser 34, the condenser 34 can be assisted in heating in the preheating stage at a lower cost, shortening the duration of the preheating stage, and the evaporator 33 can be assisted in cooling in the steady state stage to enhance the dehumidification effect. Under ideal conditions, the time and energy consumption required to reduce the moisture content of clothes from 8% to ±3% required by the national standard for clothes dryers can be reduced to half of that of the heat pump system 3 without the semiconductor electric heating device 4.

[0057] In this embodiment, the heat exchange end includes a plurality of heat exchange fins 43 arranged parallel to the air flow direction in the drying air duct. The heat exchange fins 43 improve the heat exchange efficiency between the air flow and the heat exchange end, thereby enhancing the heating and cooling effects.

[0058] In this embodiment, the evaporator 33 includes a heat exchange fin 331 , and the heat exchange fin 331 is arranged parallel to the heat exchange fin 43 .

[0059] When the airflow in the drying air duct passes through the heat exchange plate 331 of the evaporator 33 and the heat exchange fins 43, the contact area with the heat exchange fins 43 can be larger and the heat exchange is more sufficient, thereby further improving the heat exchange efficiency between the airflow and the heat exchange end and enhancing the heating and cooling effects.

[0060] Specifically, Figure 2 As shown, the number of the heat exchange fins 43 is the same as the number of the heat exchange plates 331 .

[0061] Specifically, Figure 1 As shown, the heat exchange system further includes an air inlet channel 21, the evaporator 33 further includes a heat absorbing pipe 332, the heat exchange fin 331 is convexly arranged on the heat absorbing pipe 332, and the heat absorbing pipe 332 and the heat exchange fin 331 are both made of heat conductive materials. The side of the evaporator 33 away from the heat exchange fin 43 is provided with an air inlet channel 21 connected to the front end of the drying drum 1, and the plane where the air outlet of the air inlet channel 21 is located is perpendicular to the plane where the heat exchange fin 43 is located.

[0062] Specifically, Figure 1 As shown, the condenser 34 includes a heat exchange plate 341 and a heat release pipe 342, both of which are made of heat-conducting materials. The heat exchange plate 341 is arranged parallel to the heat exchange fins 43 and the heat exchange sheet 331, further making the airflow direction through the evaporator 33, the semiconductor electric heating device 4 and the condenser 34 consistent.

[0063] In this embodiment, a plurality of heat exchange fins 43 are arranged in the drying air duct, and the spacing between two adjacent heat exchange fins 43 is equal, so that the plurality of heat exchange fins 43 can fully and evenly exchange heat with the airflow.

[0064] In this embodiment, the housing 31 is used to enclose the drying air duct, and an opening is provided on the top wall of the housing 31; the semiconductor electric heating device 4 passes through the opening and is sealed and connected to the opening, so that the heat exchange end is installed inside the drying air duct. The semiconductor electric heating device 4 is added to the housing 31 at a relatively low cost.

[0065] In this embodiment, the semiconductor electric heating device 4 also has a heat exchange end located outside the shell 31; when the heat exchange end is in the heating working mode, the heat exchange end absorbs external heat; when the heat exchange end is in the cooling working mode, the heat exchange end dissipates heat outward. The heat exchange end of the semiconductor electric heating device 4 located outside the shell 31 ensures that the semiconductor electric heating device 4 will not cool and heat the airflow of the drying air duct at the same time when it is working.

[0066] In this embodiment, the heat exchange end includes a plurality of heat exchange fins 41, and the heat exchange fins 41 are extended outward from the top of the shell 31. The plurality of heat exchange fins 41 make the heat exchange efficiency of the heat exchange end of the semiconductor electric heating device 4 higher, thereby increasing the heating temperature of the heat exchange end, or reducing the cooling temperature of the heat exchange end, so that it can perform better heat exchange.

[0067] Specifically, Figure 1 As shown, the heat exchange fin 41 and the heat exchange fin 43 are connected to form a complete heat exchange element, the heat exchange fin 41 and the heat exchange fin 43 are equal in size, and the heat exchange element further includes a connecting portion 42, through which a plurality of the heat exchange fins 41 and the heat exchange fin 43 are connected as a whole. Further, the outer periphery of the connecting portion 42 is sealed and snap-fitted with the opening on the top wall of the shell 31, thereby forming an airtight snap-fit ​​connection. Further, the connecting portion 42 is arranged in the middle of the heat exchange element.

[0068] Furthermore, the connection part 42 is made of semiconductor material, and through the Peltier effect, the surface located on the outside of the shell 31 and the surface located on the inside of the shell 31 are not cooled or heated at the same time. The surface of the connection part 42 located on the inside of the shell 31 is connected to the heat exchange fin 43, and the surface of the connection part 42 located on the outside of the shell 31 is connected to the heat exchange fin 41. The heat exchange fin 43 and the heat exchange fin 41 enhance the heat exchange and cooling efficiency of the connection part 42. Specifically, a plurality of the heat exchange fins 43 and the heat exchange fins 41 are arranged perpendicular to the connection part 42.

[0069] In a specific embodiment, by adding a semiconductor electric heating device 4, the heat pump system 3 is improved at a relatively low cost.

[0070] Specifically, the heat exchange fins 43 are arranged perpendicular to the bottom surface of the housing 31. Figure 1 As shown, the number of the heat exchange fins 43 is preferably 10.

[0071] In this embodiment, the heat exchange system of the heat pump clothes dryer further includes: a fan 23, which is arranged at the air inlet of the housing 31 and is used to drive air to flow along the drying air duct; the heat exchange end includes a plurality of heat exchange fins 43 arranged parallel to the air flow direction in the drying air duct; the plane where the air inlet of the housing 31 is located is arranged perpendicular to the plane where the heat exchange fins 43 are located. By making the air flow pass through the heat exchange fins 43 more smoothly and quickly, the heat exchange efficiency between the air flow and the heat exchange end is further improved, and the heating and cooling effects are enhanced.

[0072] In this embodiment, the air inlet of the housing 31 and the air outlet of the housing 31 are arranged in a staggered and parallel manner; between the plane where the air inlet is located and the plane where the air outlet is located, the drying air duct is formed, the air flow direction of which is perpendicular to the air inlet and the air outlet. This further enables the air flow to pass through the heat exchange fins 43 more smoothly and quickly, further improves the heat exchange efficiency between the air flow and the heat exchange end, and enhances the heating and cooling effects.

[0073] Specifically, the projections of the air inlet of the shell 31 and the air outlet of the shell 31 along the airflow direction do not overlap with each other, so as to form a staggered arrangement.

[0074] Specifically, Figure 3 As shown, the heat exchange system also includes an air outlet channel 22, the air outlet of the shell 31 is connected to the air outlet channel 22, the air outlet channel 22 is connected to the front end of the drying cylinder 1, the air inlet channel 21 is connected to the center of the bottom of the drying cylinder 1, and the air outlet of the air inlet channel 21 is connected to the inner wall of the drying cylinder 1.

[0075] In this embodiment, the working process of the heat exchange system of the heat pump dryer is: the fan 23, the semiconductor electric heating device 4, the evaporator 33 and the condenser 34 are started, and the heat exchange system enters the preheating stage. The preheating stage is: air is sucked into the drying air duct of the shell 31, and the air first passes through the evaporator 33, and the humid air is changed into dry cold air through the evaporator 33, and then passes through the semiconductor electric heating device 4 and the condenser 34, and the dry cold air is heated to dry hot air. The semiconductor electric heating device 4 and the condenser 34 are heated to the set temperature respectively, and the evaporator 33 is cooled to the set temperature. In the preheating stage, the semiconductor electric heating device 4 is connected to a forward current, and the heat exchange fins 43 are heated up by the Peltier effect of the current. Compared with the mechanical heating of the condenser 34 by the refrigerant, heat can be generated faster, so that the heat exchange system as a whole can quickly reach the target temperature, and then the clothes can be quickly dried and heated, shortening the time required for the water in the clothes to reach the boiling point for evaporation, and effectively shortening the duration of the preheating stage;

[0076] After the condenser 34 is heated up to the set temperature and the evaporator 33 is cooled down to the set temperature, the heat exchange system enters a steady-state stage. In the steady-state stage, especially after a long period of time in the steady-state stage causes the evaporator 33 to heat up, a reverse current is connected through the semiconductor electric heating device 4, and the heat exchange fins 43 are cooled through the Peltier effect of the current, and the dry cold air passing through the evaporator 33 is further processed to further dry it.

[0077] In this embodiment, by arranging the semiconductor electric heating device 4 between the evaporator 33 and the condenser 34, it is possible to assist the condenser 34 in heating during the preheating stage at a relatively low cost, shorten the duration of the preheating stage, and assist the evaporator 33 in cooling during the steady-state stage, thereby enhancing the dehumidification effect; by arranging the heat exchange plate 331 parallel to the heat exchange fin 43, the heat exchange efficiency between the airflow and the heat exchange end is further improved, thereby enhancing the heating and cooling effects.

[0078] Embodiment 2

[0079] like Figures 1 to 3 As shown, this embodiment provides a heat pump dryer based on the first embodiment, and the heat pump dryer includes the heat exchange system of the heat pump dryer described in the first embodiment.

[0080] According to specific implementation conditions, the heat exchange system can be arranged at any position close to the drying drum 1 of the heat pump dryer.

[0081] In one embodiment, if Figure 1 As shown, the heat exchange system is preferably arranged above the drying drum 1. Specifically, the bottom surface of the shell 31 of the heat exchange system is fixedly connected to the top of the drying drum 1.

[0082] In one embodiment, if Figure 2 As shown, the heat exchange system is arranged below the drying drum 1 of the heat pump clothes dryer. Specifically, the bottom surface of the housing 31 of the heat exchange system which is not in contact with the semiconductor electric heating device 4 is fixedly connected to the bottom of the drying drum 1 .

[0083] In this embodiment, the heat pump dryer dries clothes through the heat exchange system of the heat pump dryer. Specifically, the air inlet of the air inlet channel 21 of the heat exchange system is connected to the rear end of the drying drum 1, and the air outlet of the air outlet channel 22 of the heat exchange system is connected to the front end of the drying drum 1. More specifically, Figure 2 As shown, the air inlet of the air inlet channel 21 is preferably connected to the inner wall of the drying drum 1, and the air outlet channel 22 is preferably connected to the drying drum opening wall 11 at the front end of the drying drum 1. The drying drum opening wall 11 can be a door wall of the drying drum 1 in contact with the door in a specific embodiment.

[0084] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A heat exchange system of a heat pump clothes dryer, comprising a drying air duct, and an evaporator and a condenser located inside the drying air duct and arranged at intervals along the drying air duct, characterized in that: Also includes: A semiconductor electric heating device having a heat exchange end, which can be switched between heating and cooling working modes by controlling the direction of current flowing through the semiconductor electric heating device; The heat exchange end is arranged in the drying air duct and is located between the evaporator and the condenser.

2. The heat exchange system of a heat pump dryer according to claim 1, characterized in that: The heat exchange end includes a plurality of heat exchange fins arranged parallel to the air flow direction in the drying air duct.

3. The heat exchange system of a heat pump dryer according to claim 2, characterized in that: The evaporator comprises heat exchange fins, and the heat exchange fins are arranged parallel to the heat exchange fins.

4. The heat exchange system of a heat pump clothes dryer according to claim 2, characterized in that: Also includes: The distances between two adjacent heat exchange fins are equal.

5. The heat exchange system of a heat pump clothes dryer according to claim 1, characterized in that: Also includes: A shell body, used to enclose the drying air duct, and an opening is arranged on the top wall of the shell body; The semiconductor electric heating device passes through the opening and is sealedly connected to the opening, so that the heat exchange end is installed inside the drying air duct.

6. The heat exchange system of a heat pump clothes dryer according to claim 5, characterized in that: The semiconductor electric heating device also has a heat exchange end located outside the shell; When the heat exchange end is in a heating working mode, the heat exchange end absorbs external heat; when the heat exchange end is in a cooling working mode, the heat exchange end dissipates heat outward.

7. The heat exchange system of a heat pump clothes dryer according to claim 6, characterized in that: The heat exchange end includes a plurality of heat exchange fins, and the heat exchange fins are extended outward from the top of the shell.

8. A heat exchange system for a heat pump clothes dryer according to any one of claims 5 to 7, characterized in that: Also includes: A fan, arranged at the air inlet of the housing, for driving air to flow along the drying air duct; The heat exchange end includes a plurality of heat exchange fins arranged parallel to the air flow direction in the drying air duct; The plane where the air inlet of the shell is located is perpendicular to the plane where the heat exchange fins are located.

9. The heat exchange system of a heat pump clothes dryer according to claim 8, characterized in that: The air inlet of the shell and the air outlet of the shell are arranged in a staggered and parallel manner; The drying air duct is formed between the plane where the air inlet is located and the plane where the air outlet is located, and the air flow direction is perpendicular to the air inlet and the air outlet.

10. A heat pump clothes dryer, characterized in that: The heat pump clothes dryer comprises the heat exchange system of the heat pump clothes dryer according to any one of claims 1 to 9.

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