Heat pump clothes dryer

Abstract

The invention relates to the technical field of drying, in particular to a heat pump clothes dryer, and aims to solve the problem that the temperature rise speed of air in a clothes treatment cavity of an existing heat pump clothes dryer is low in the early stage of drying. In order to achieve the purpose, the heat pump clothes dryer comprises a clothes processing cavity, a drying air duct, a draught fan, a condenser, a compressor and an evaporator assembly, and the drying air duct and the clothes processing cavity form a circulating air duct; the fan is arranged in the drying air duct; the condenser is arranged in the drying air duct; the compressor is arranged outside the drying air duct and communicates with the condenser; the evaporator assembly is arranged in the drying air duct and located on the upstream of the condenser, the evaporator assembly communicates with the compressor and the condenser, and the evaporator assembly is constructed to enable air flowing in the drying air duct not to make contact with / not make contact with the evaporator assembly in the refrigeration state. In this way, the temperature of air flowing in the circulating air duct can be rapidly increased under the heating action of the condenser in the heating stage of the drying earlier stage of the heat pump clothes dryer.

Description

Technical Field

[0001] The invention relates to the technical field of drying, and in particular provides a heat pump clothes dryer. Background Art

[0002] As a household appliance that can quickly dry clothes, a dryer allows people to wear dry and comfortable clothes in humid weather. It also reduces the space used for drying clothes and improves people's quality of life. Therefore, heat pump dryers are becoming more and more popular among users.

[0003] However, with the application of dryers, people have put forward higher requirements for drying quality, speed, uniformity, and energy consumption. Heat pump dryers have become the main product type in the current dryer market due to their energy-saving advantages. However, the existing heat pump dryers have the problem of slow air heating speed in the clothes processing chamber in the early stage of drying, which has also become a major pain point for users.

[0004] Therefore, the art needs a new heat pump dryer and a control method thereof to solve the above technical problems. Summary of the invention

[0005] The present invention aims to solve the above technical problem, that is, to solve the problem that the air in the clothes processing chamber of the existing heat pump dryer heats up slowly in the early stage of drying.

[0006] The present invention provides a heat pump clothes dryer, the heat pump clothes dryer comprising:

[0007] A clothes processing chamber, which is arranged inside the device body of the heat pump dryer;

[0008] A drying air duct, which is configured with the clothes processing chamber to form a circulation air duct;

[0009] A fan, which is arranged in the drying air duct;

[0010] A condenser, which is arranged inside the drying air duct;

[0011] A compressor, which is arranged outside the drying air duct, and the compressor is communicated with the condenser; and

[0012] An evaporator assembly is arranged inside the drying air duct and upstream of the condenser. The evaporator assembly is connected to the compressor and the condenser. The evaporator assembly is configured to prevent the air flowing in the drying air duct from contacting / with the evaporator assembly in a cooling state.

[0013] In the preferred technical solution of the above heat pump dryer, the evaporator assembly comprises:

[0014] a first evaporator, which is connected to the condenser and the compressor through a refrigerant pipeline;

[0015] A box body, which is sleeved on the outside of the first evaporator;

[0016] an opening formed in the housing; and

[0017] A door body is connected to the opening to block the opening or adjust the opening degree of the opening.

[0018] In the preferred technical solution of the above heat pump dryer, the opening comprises:

[0019] A first opening is provided at an end of the housing close to the laundry processing chamber; and

[0020] A second opening, which is provided at an end of the box body away from the laundry processing chamber;

[0021] The door body comprises:

[0022] A first door body connected to the first opening; and

[0023] A second door body is connected to the second opening.

[0024] In the preferred technical solution of the above heat pump dryer, the evaporator assembly further comprises:

[0025] a second evaporator, which is connected to the condenser, the compressor and the first evaporator through a refrigerant pipeline; and

[0026] The first valve component is correspondingly arranged on the refrigerant pipeline between the condenser and the first evaporator and between the condenser and the second evaporator, and is constructed to enable the refrigerant pipeline between the second evaporator and the condenser to be in a closed state, and the refrigerant pipeline between the first evaporator and the condenser to be in an open state. It is also constructed to enable the refrigerant pipeline between the second evaporator and the condenser to be in an open state and the refrigerant pipeline between the first evaporator and the condenser to be in a closed state, or the refrigerant pipelines between the second evaporator and the condenser and the first evaporator and the condenser are both in an open state.

[0027] In the preferred technical solution of the above heat pump dryer, the first valve assembly includes:

[0028] A first solenoid valve is provided in a refrigerant pipeline between the condenser and the first evaporator; and

[0029] The second solenoid valve is arranged in the refrigerant pipeline between the condenser and the second evaporator.

[0030] In the preferred technical solution of the above heat pump clothes dryer, the drying air duct further comprises an air duct branch, the air inlet of the air duct branch is communicated with the clothes processing chamber, the air outlet of the air duct branch is communicated with the side wall of the drying air duct, the air outlet is located upstream of the condenser, and the evaporator assembly comprises:

[0031] A third evaporator, which is arranged in the main air duct of the drying air duct, and the third evaporator is connected with the condenser and the compressor through a refrigerant pipeline;

[0032] a fourth evaporator, which is arranged in the air duct branch, and the fourth evaporator is connected with the condenser, the compressor and the third evaporator through a refrigerant pipeline;

[0033] an air curtain assembly, which is disposed at the air inlet and is configured to be able to adjust the opening of the air inlet; and

[0034] The second valve component is correspondingly arranged on the refrigerant pipeline between the condenser and the third evaporator and between the condenser and the fourth evaporator, and is constructed to enable the refrigerant pipeline between the third evaporator and the condenser to be in a closed state, and the refrigerant pipeline between the fourth evaporator and the condenser to be in an open state, and is also constructed to enable the refrigerant pipeline between the third evaporator and the condenser and / or the refrigerant pipeline between the fourth evaporator and the condenser to be in an open state.

[0035] In the preferred technical solution of the above heat pump clothes dryer, the air curtain assembly comprises:

[0036] a rotating shaft, which is rotatably connected to the air inlet;

[0037] an air guide plate fixedly connected to the rotating shaft, wherein the air guide plate is configured to block the air inlet when driven by the rotating shaft; and

[0038] A servo motor, a main body of which is fixedly connected to the inner edge of the air inlet, and an output shaft of the servo motor is connected to the rotating shaft.

[0039] In the preferred technical solution of the above heat pump dryer, the second valve assembly includes:

[0040] A third solenoid valve is provided in the refrigerant pipeline between the condenser and the third evaporator; and

[0041] A fourth solenoid valve is arranged in the refrigerant pipeline between the condenser and the fourth evaporator.

[0042] In the preferred technical solution of the above heat pump dryer, the heat pump dryer further comprises:

[0043] a temperature sensor, disposed in the laundry processing chamber, for detecting the air temperature inside the laundry processing chamber; and

[0044] A humidity sensor is arranged in the drying air duct and located downstream of the evaporator assembly, and is used to detect the air humidity in the drying air duct downstream of the evaporator assembly.

[0045] In the preferred technical solution of the above-mentioned heat pump dryer, the heat pump dryer also includes a throttle valve, which is arranged in the refrigerant pipeline between the evaporator assembly and the condenser, and is used to adjust the flow rate of the refrigerant in the refrigerant pipeline.

[0046] When the above-mentioned technical scheme is adopted, the present invention can prevent the air flowing in the drying duct from contacting the evaporator component in the refrigeration state in the early stage of drying the clothes, that is, before the air temperature in the clothes processing chamber is greater than or equal to the first temperature threshold. In this way, the air flowing in the circulating air duct of the heat pump dryer can be quickly heated up under the heating action of the condenser during the heating stage in the early stage of drying, thereby improving the heating speed of the air inside the clothes processing drum of the heat pump dryer in the early stage of drying. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0048] Figure 1 is a schematic structural diagram of a first embodiment of a heat pump clothes dryer of the present invention;

[0049] Figure 2 is a structural schematic diagram of a second embodiment of the heat pump dryer of the present invention;

[0050] Figure 3 It is a schematic structural diagram of a third embodiment of the heat pump dryer of the present invention.

[0051] List of reference numerals:

[0052] 100. heat pump clothes dryer; 1. clothing processing chamber; 2. drying air duct; 21. main air duct; 22. branch air duct; 3. fan; 4. compressor; 5. condenser; 6. evaporator assembly; 61. first evaporator; 62. housing; 63. door; 631. first door; 632. second door; 64. opening; 641. first opening; 642. second opening; 65. second evaporator; 66. first valve assembly; 661. first solenoid valve; 662. second solenoid valve; 67. fourth evaporator; 68. third evaporator; 69. air curtain assembly; 610. second valve assembly; 6101. fourth solenoid valve; 6102. third solenoid valve; 7. humidity sensor; 8. temperature sensor; 9. throttle valve. DETAILED DESCRIPTION

[0053] The preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the scope of protection of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios. For example, although the description is described in conjunction with a heat pump dryer, it is obviously also applicable to other household appliances with a drying function.

[0054] It should be noted that, in the description of the present invention, the terms "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are merely for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and "fourth" and the drawings are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated, and thus, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include one or more features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0055] In addition, it should be noted that in the description of the present invention, 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] Figure 1 It is a schematic structural diagram of a first embodiment of the heat pump dryer of the present invention. Figure 2 It is a schematic structural diagram of a second embodiment of the heat pump dryer of the present invention. Figure 3 It is a schematic structural diagram of a third embodiment of the heat pump dryer of the present invention.

[0057] like Figure 1As shown, in order to solve the problem of slow air heating speed inside the clothes processing chamber in the early stage of drying in the existing heat pump dryer. The heat pump dryer 100 includes a device body (not shown), a clothes processing chamber 1, a drying air duct 2, a fan 3, a condenser 5, a compressor 4 and an evaporator assembly 6. The clothes processing chamber 1 is arranged inside the device body of the heat pump dryer 100, and the drying air duct 2 and the clothes processing chamber 1 are configured to form a circulating air duct. The fan 3 is arranged inside the drying air duct 2, specifically, the fan 3 is arranged downstream of the condenser 5 and upstream of the clothes processing chamber 1, wherein the condenser 5 is arranged inside the drying air duct 2. The compressor 4 is arranged outside the circulating air duct, and the compressor 4 is connected to the condenser 5 through a refrigerant pipeline. The evaporator assembly 6 is arranged inside the drying air duct 2 and upstream of the condenser 5. The evaporator assembly 6 is connected to the compressor 4 and the condenser 5 through a refrigerant pipeline. The evaporator assembly 6 is configured to prevent the air flowing in the drying air duct 2 from contacting the evaporator assembly 6 in a cooling state before the air in the clothing processing chamber 1 is greater than or equal to a first temperature threshold, so as to avoid the evaporator assembly 6 in a cooling state from cooling the air flowing in the drying air duct 2, thereby increasing the temperature rise rate of the air in the clothing processing chamber 1 in the early stage of drying. Moreover, the evaporator assembly 6 is also configured to directly contact the evaporator assembly 6 in a cooling state after the air temperature in the clothing processing chamber 1 is greater than the first temperature threshold, so that the evaporator can cool and dehumidify the air to ensure the drying effect of the heat pump dryer 100.

[0058] like Figure 1As shown, as a possible embodiment, the evaporator assembly 6 includes a first evaporator 61, a housing 62, an opening 64 and a door 63. The first evaporator 61 is connected to the condenser 5 and the compressor 4 through a refrigerant pipeline. The housing 62 is sleeved on the outside of the first evaporator 61, and the opening 64 is provided on the housing 62. The door 63 is connected to the opening 64. Specifically, a driving part (not shown) is provided between the opening 64 and the door 63. The driving part is correspondingly connected to the housing 62 and the door 63, and is configured to drive the door 63 to block the opening 64 when the air temperature in the clothing processing chamber 1 is greater than or equal to the first temperature threshold, and is also configured to drive the door 63 to adjust the opening of the opening 64 after the air temperature in the clothing processing chamber 1 is greater than the first temperature threshold. More specifically, the door body 63 is rotatably connected to the edge of the opening 64, the driving part is a stepper motor, the main body of the stepper motor is fixedly connected to the box body 62, and the output shaft of the stepper motor is connected to the door body 63. For example, the output shaft of the stepper motor is connected to a driving gear, and the door body 63 is connected to a driven gear. In this way, during the rotation of the output shaft of the stepper motor, the door body 63 can be driven to rotate relative to the opening. Moreover, since the rotation angle of the output shaft of the stepper motor can be controlled, in the specific implementation of the present invention, the rotation angle of the door body 63 can also be controlled so that the stepper motor can The opening degree of the opening 64 is adjusted under the control of the controller, so that the heat pump dryer 100 can adjust the efficiency of the evaporator component 6 in condensing the gaseous water in the air in the drying duct 2 by adjusting the opening degree of the opening 64, and also avoid the situation where the air temperature is significantly cooled due to the opening 64 being too large, and the temperature of the air entering the clothing processing chamber 1 is lower than the drying requirement, thereby achieving the dehumidification effect of the evaporator while ensuring the drying temperature of the air entering the clothing processing chamber 1, thereby ensuring the drying effect of the heat pump dryer 100.

[0059] like Figure 2As shown, as another possible implementation, the evaporator assembly 6 further includes a second evaporator 65 and a first valve assembly 66. The second evaporator 65 is connected to the condenser 5, the compressor 4 and the first evaporator 61 through a refrigerant pipeline. The first valve assembly 66 corresponds to the refrigerant pipeline between the condenser 5 and the first evaporator 61 and the refrigerant pipeline between the condenser 5 and the second evaporator 65, and is constructed to make the refrigerant pipeline between the second evaporator 65 and the condenser 5 in a closed state and the refrigerant pipeline between the first evaporator 61 and the condenser 5 in an open state before the air temperature in the clothing processing chamber 1 is greater than or equal to the first temperature threshold, so that before the air temperature in the clothing processing chamber 1 is greater than or equal to the first temperature, no refrigerant flows through the second evaporator 65 which is in direct contact with the air flowing in the drying duct 2, and because the first evaporator 61 is located inside the sealed box 62, the evaporator assembly 6 does not exchange heat with the air flowing in the drying duct 2 at this time, so that the air in the drying duct 2 can rise rapidly to improve the drying efficiency of the heat pump dryer 100.

[0060] It is also configured such that after the air temperature in the clothing processing chamber 1 is greater than or equal to a first temperature threshold, the refrigerant pipeline between the second evaporator 65 and the condenser 5 can be in an open state and the refrigerant pipeline between the first evaporator 61 and the condenser 5 can be in a closed state. In this way, after the air temperature in the clothing processing chamber 1 is greater than or equal to the first temperature threshold, the air flowing in the drying duct 2 can directly exchange heat with the second evaporator 65 so that the second evaporator 65 can dehumidify the flowing air, and the first evaporator 61 located in the box body 62 does not perform cooling work, thereby saving power consumption of the heat pump dryer 100. Moreover, the humidity of the air in the drying duct 2 downstream of the evaporator assembly 6 is detected by the humidity sensor 7 installed in the drying duct 2, wherein the humidity sensor 7 is arranged downstream of the evaporator assembly 6. If the air humidity detected by the humidity sensor 7 is greater than the first humidity threshold, it means that the dehumidification speed of the second evaporator 65 does not meet the drying requirements of the heat pump dryer 100. At this time, the door body 63 can also be driven to rotate relative to the opening 64 by controlling the driving unit to adjust the opening degree of the opening 64, so that the cold air in the box body 62 can be released into the drying duct 2, thereby further improving the cooling speed of the evaporator assembly 6 for the air flowing in the drying duct 2, and then improving the dehumidification speed of the evaporator assembly 6 for the air flowing in the drying duct 2. In addition, through the above-mentioned setting method, the cold air stored in the box body 62 can also be utilized, thereby improving the energy utilization rate of the heat pump dryer 100 and reducing the power consumption of the heat pump dryer 100.

[0061] It should be noted that in the specific implementation of the present invention, if after the opening 64 of the box body 62 is opened, the air humidity detected by the humidity sensor 7 is still greater than the first humidity threshold, the first valve assembly 66 can switch the refrigerant pipeline between the first evaporator 61 and the condenser 5 from a closed state to an open state, so that the first evaporator 61 and the second evaporator 65 can dehumidify the air at the same time, so as to further increase the dehumidification speed of the evaporator assembly 6 for the air, thereby reducing the humidity of the air after passing through the evaporator assembly 6.

[0062] like Figure 2 As shown, as a possible implementation, the opening 64 provided on the housing 62 includes a first opening 641 and a second opening 642, the first opening 641 is provided at the end of the housing 62 close to the laundry processing chamber 1, and the second opening 642 is provided at the end of the housing 62 away from the laundry processing chamber 1. The door body 63 includes a first door body 631 and a second door body 632, the first door body 631 is connected to the first opening 641, and the second door body 632 is connected to the second opening 642. At this time, the driving part includes a first stepper motor and a second stepper motor, specifically, the main body of the first stepper motor is fixedly connected to the housing 62, the output shaft of the first stepper motor is connected to the first door body 631, the main body of the second stepper motor is fixedly connected to the housing 62, and the output shaft of the second stepper motor is connected to the second door body 632. Through the above-mentioned arrangement, when it is necessary to open the box body 62, the first door body 631 and the second door body 632 can be driven to rotate respectively by the first stepper motor and the second stepper motor, so that the air flowing in the drying duct 2 can flow through the first opening 641 and the second opening 642 in turn, so that the flowing air can quickly exchange heat with the cold air in the box body 62.

[0063] Preferably, in the specific implementation of the present invention, the box 62 is made of a heat-insulating material, so that when the box 62 is in a sealed state, the heat exchange rate between the cold air inside the box 62 and the air flowing in the drying duct 2 is reduced. It should be noted that although the box 62 described above is made of a moisturizing material, this is not restrictive. In the specific implementation of the present invention, the box 62 may not be made of a heat-insulating material, and those skilled in the art may also provide a heat-insulating layer on the outer circumference of the box 62 to reduce the heat exchange rate between the cold air inside the box 62 and the air flowing in the drying duct 2.

[0064] like Figure 2As shown in the figure, as a possible implementation, the first valve assembly 66 includes a first solenoid valve 661 and a second solenoid valve 662. The first solenoid valve 661 is provided in the refrigerant pipeline between the condenser 5 and the first evaporator 61, and is used to switch the open and closed state of the refrigerant pipeline of the refrigerant flowing to the first evaporator 61. The second solenoid valve 662 is provided in the refrigerant pipeline between the condenser 5 and the second evaporator 65, and is used to switch the open and closed state of the refrigerant pipeline of the refrigerant flowing to the second evaporator 65.

[0065] like Figure 3 As shown, as another possible embodiment, the drying air duct 2 also includes an air duct branch 22, the air inlet of the air duct branch 22 is connected to the clothes processing chamber 1, and the air outlet of the air duct branch 22 is connected to the side wall of the drying air duct 2, and the air outlet is located upstream of the condenser 5. At this time, the drying air duct 2 connected to the air duct branch 22 is the air duct main road 21. The evaporator assembly 6 includes a third evaporator 68, a fourth evaporator 67, an air curtain assembly 69 and a second valve assembly 610. The third evaporator 68 is arranged in the air duct main road 21 of the drying air duct 2, and the third evaporator 68 is connected to the condenser 5 and the compressor 4 through a refrigerant pipeline. The fourth evaporator 67 is arranged in the air duct branch 22, and the fourth evaporator 67 is connected to the condenser 5, the compressor 4 and the third evaporator 68 through a refrigerant pipeline. The air curtain assembly 69 is arranged at the air inlet of the air duct branch 22, and is configured to be able to adjust the opening of the air inlet to adjust the air intake speed of the air inlet. The second valve assembly 610 corresponds to the refrigerant pipeline between the condenser 5 and the third evaporator 68 and between the condenser 5 and the fourth evaporator 67, and is constructed to make the refrigerant pipeline between the third evaporator 68 and the condenser 5 in a closed state and the refrigerant pipeline between the fourth evaporator 67 and the condenser 5 in an open state before the air temperature in the clothing processing chamber 1 is greater than or equal to the first temperature threshold. In addition, the controller controls the wind curtain assembly 69 to block the air inlet, so that before the air temperature in the clothing processing chamber 1 is greater than or equal to the first temperature threshold, the air flowing in the drying air duct 2 only flows through the third evaporator 68 through which no refrigerant flows. In this way, before the air temperature in the clothing processing chamber 1 is greater than or equal to the first temperature threshold, the air flowing in the circulating air duct will not exchange heat with the third evaporator 68 and the fourth evaporator 67, so that the air in the clothing processing chamber 1 can be quickly heated up.

[0066] It is also configured such that after the air temperature in the clothing processing chamber 1 is greater than or equal to a first temperature threshold, the refrigerant pipeline between the third evaporator 68 and the condenser 5 can be in an open state and the refrigerant pipeline between the third evaporator 68 and the condenser 5 can be in a closed state. In this way, after the air temperature in the clothing processing chamber 1 is greater than or equal to the first temperature threshold, the air flowing in the drying duct 2 can directly exchange heat with the third evaporator 68, so that the third evaporator 68 can dehumidify the flowing air, and the fourth evaporator 67 located in the box body 62 does not perform cooling work, thereby saving power consumption of the heat pump dryer 100. Moreover, the humidity of the air in the drying duct 2 downstream of the evaporator assembly 6 is detected by the humidity sensor 7 installed in the drying duct 2, wherein the humidity sensor 7 is arranged downstream of the evaporator assembly 6. If the air humidity detected by the humidity sensor 7 is greater than the first humidity threshold, it means that the dehumidification speed of the third evaporator 68 does not meet the drying requirements of the heat pump dryer 100. At this time, the opening of the air inlet can also be adjusted by controlling the wind curtain assembly 69 to adjust the opening of the opening 64, so that the cold air in the box body 62 can be released into the drying duct 2, thereby further improving the cooling speed of the evaporator assembly 6 for the air flowing in the drying duct 2, and then improving the dehumidification speed of the evaporator assembly 6 for the air flowing in the drying duct 2. In addition, through the above-mentioned setting method, the cold air retained in the air duct branch 22 can also be utilized, thereby improving the energy utilization rate of the heat pump dryer 100 and reducing the power consumption of the heat pump dryer 100.

[0067] It should be noted that in the specific implementation of the present invention, if the air humidity detected by the humidity sensor 7 is still greater than the first humidity threshold after the air inlet is opened, the second valve assembly 610 can switch the refrigerant pipeline between the fourth evaporator 67 and the condenser 5 from a closed state to an open state, so that the third evaporator 68 and the fourth evaporator 67 can dehumidify the air at the same time, so as to further increase the dehumidification speed of the evaporator assembly 6 for the air, thereby reducing the humidity of the air after passing through the evaporator assembly 6.

[0068] In addition, although the above description states that after the air temperature in the clothing processing chamber 1 is greater than or equal to the first temperature threshold, the controller controls the second valve assembly 610 so that the refrigerant pipeline between the third evaporator 68 and the condenser 5 is in an open state, and the refrigerant pipeline between the fourth evaporator 67 and the condenser 5 is in a closed state, so that the third evaporator 68 can cool the air flowing in the drying duct 2, this is not restrictive. In other embodiments of the present invention, after the air temperature in the clothing processing chamber 1 is greater than or equal to the first temperature threshold, the controller can also control the second valve assembly 610 so that the refrigerant pipeline between the third evaporator 68 and the condenser 5 and the refrigerant pipeline between the fourth evaporator 67 and the refrigerant pipeline are both in a closed state, and the controller controls the wind curtain assembly 69 to open the air inlet so that the air flowing in the circulating air duct can take away the cold air in the branch, so that the humidity of the air is reduced. In this way, while reducing the air humidity, the power consumption of the heat pump dryer 100 can also be reduced. However, this is not restrictive. Those skilled in the art may also configure the heat pump dryer 100 so that, after the air temperature in the clothing processing chamber 1 is greater than or equal to the first temperature threshold, the controller may control the second valve assembly 610 so that the refrigerant pipeline between the third evaporator 68 is in a closed state, and the refrigerant pipeline between the fourth evaporator 67 and the condenser 5 is in an open state, so that the fourth evaporator 67 can cool the air flowing in the circulating air duct.

[0069] Preferably, in the specific implementation of the present invention, the air curtain assembly 69 includes a rotating shaft (not shown), an air guide plate (not shown) and a servo motor (not shown), the rotating shaft is rotatably connected to the air inlet, the air guide plate is fixedly connected to the rotating shaft, and the air guide plate is configured to block the air inlet under the drive of the rotating shaft. The main body of the servo motor is fixedly connected to the inner edge of the air inlet, and the output shaft of the servo motor is connected to the rotating shaft, so that the servo motor can drive the rotating shaft to rotate to drive the air guide plate to rotate to adjust the opening of the air inlet.

[0070] like Figure 3 As shown, as a possible implementation, the second valve assembly 610 includes a third solenoid valve 6102 and a fourth solenoid valve 6101. The third solenoid valve 6102 is provided in the refrigerant pipeline between the condenser 5 and the third evaporator 68, and is used to switch the open and closed state of the refrigerant pipeline of the refrigerant flowing to the third evaporator 68. The fourth solenoid valve 6101 is provided in the refrigerant pipeline between the condenser 5 and the fourth evaporator 67, and is used to switch the open and closed state of the refrigerant pipeline of the refrigerant flowing to the fourth evaporator 67.

[0071] like Figure 1 See also Figure 2 and Figure 3As a possible implementation, the heat pump dryer 100 also includes a temperature sensor 8 and a humidity sensor 7. The temperature sensor 8 is arranged in the clothing processing chamber 1, and is used to detect the air temperature inside the clothing processing chamber 1. The humidity sensor 7 is arranged in the drying air duct 2 and is located downstream of the evaporator assembly 6, and is used to detect the air humidity in the drying air duct 2 downstream of the evaporator assembly 6.

[0072] like Figure 1 See also Figure 2 and Figure 3 As a possible implementation, the heat pump dryer 100 also includes a throttle valve 9, which is arranged in the refrigerant pipeline between the evaporator assembly 6 and the condenser 5, and is used to adjust the flow rate of the refrigerant in the refrigerant pipeline to adjust the temperature control efficiency of the evaporator assembly 6 on the air flowing in the circulating air duct.

[0073] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A heat pump clothes dryer, characterized in that: The heat pump clothes dryer comprises: A clothes processing chamber, which is arranged inside the device body of the heat pump dryer; A drying air duct, which is configured with the clothes processing chamber to form a circulation air duct; A fan, which is arranged in the drying air duct; A condenser, which is arranged inside the drying air duct; A compressor, which is arranged outside the drying air duct, and the compressor is communicated with the condenser; and An evaporator assembly is arranged inside the drying air duct and upstream of the condenser. The evaporator assembly is connected to the compressor and the condenser. The evaporator assembly is configured to prevent the air flowing in the drying air duct from contacting / with the evaporator assembly in a cooling state.

2. The heat pump dryer according to claim 1, characterized in that: The evaporator assembly comprises: a first evaporator, which is connected to the condenser and the compressor through a refrigerant pipeline; A box body, which is sleeved on the outside of the first evaporator; an opening formed in the housing; and A door body is connected to the opening to block the opening or adjust the opening degree of the opening.

3. The heat pump dryer according to claim 2, characterized in that: The opening comprises: A first opening is provided at an end of the housing close to the laundry processing chamber; and A second opening, which is provided at an end of the box body away from the laundry processing chamber; The door body comprises: A first door body connected to the first opening; and A second door body is connected to the second opening.

4. The heat pump dryer according to claim 2, characterized in that: The evaporator assembly further comprises: a second evaporator, which is connected to the condenser, the compressor and the first evaporator through a refrigerant pipeline; and The first valve component is correspondingly arranged on the refrigerant pipeline between the condenser and the first evaporator and between the condenser and the second evaporator, and is constructed to enable the refrigerant pipeline between the second evaporator and the condenser to be in a closed state, and the refrigerant pipeline between the first evaporator and the condenser to be in an open state. It is also constructed to enable the refrigerant pipeline between the second evaporator and the condenser to be in an open state and the refrigerant pipeline between the first evaporator and the condenser to be in a closed state, or the refrigerant pipelines between the second evaporator and the condenser and the first evaporator and the condenser are both in an open state.

5. The heat pump dryer according to claim 4, characterized in that: The first valve assembly comprises: A first solenoid valve is provided in a refrigerant pipeline between the condenser and the first evaporator; and The second solenoid valve is arranged in the refrigerant pipeline between the condenser and the second evaporator.

6. The heat pump clothes dryer according to claim 1, characterized in that: The drying air duct further comprises an air duct branch, an air inlet of the air duct branch is communicated with the clothes processing chamber, an air outlet of the air duct branch is communicated with a side wall of the drying air duct, and the air outlet is located upstream of the condenser. The evaporator assembly comprises: A third evaporator, which is arranged in the main air duct of the drying air duct, and the third evaporator is connected with the condenser and the compressor through a refrigerant pipeline; a fourth evaporator, which is arranged in the air duct branch, and the fourth evaporator is connected with the condenser, the compressor and the third evaporator through a refrigerant pipeline; an air curtain assembly, which is disposed at the air inlet and is configured to be able to adjust the opening of the air inlet; and The second valve component is correspondingly arranged on the refrigerant pipeline between the condenser and the third evaporator and between the condenser and the fourth evaporator, and is constructed to enable the refrigerant pipeline between the third evaporator and the condenser to be in a closed state, and the refrigerant pipeline between the fourth evaporator and the condenser to be in an open state, and is also constructed to enable the refrigerant pipeline between the third evaporator and the condenser and / or the refrigerant pipeline between the fourth evaporator and the condenser to be in an open state.

7. The heat pump clothes dryer according to claim 6, characterized in that: The air curtain assembly comprises: a rotating shaft, which is rotatably connected to the air inlet; an air guide plate fixedly connected to the rotating shaft, wherein the air guide plate is configured to block the air inlet when driven by the rotating shaft; and A servo motor, a main body of which is fixedly connected to the inner edge of the air inlet, and an output shaft of the servo motor is connected to the rotating shaft.

8. The heat pump clothes dryer according to claim 6, characterized in that: The second valve assembly comprises: A third solenoid valve is provided in the refrigerant pipeline between the condenser and the third evaporator; and A fourth solenoid valve is arranged in the refrigerant pipeline between the condenser and the fourth evaporator.

9. The heat pump clothes dryer according to claim 1, characterized in that: The heat pump clothes dryer also includes: a temperature sensor, disposed in the laundry processing chamber, for detecting the air temperature inside the laundry processing chamber; and A humidity sensor is arranged in the drying air duct and located downstream of the evaporator assembly, and is used to detect the air humidity in the drying air duct downstream of the evaporator assembly.

10. The heat pump dryer according to any one of claims 1 to 9, further comprising a throttle valve, wherein the throttle valve is disposed in the refrigerant pipeline between the evaporator assembly and the condenser, and is used to adjust the flow rate of the refrigerant in the refrigerant pipeline.

Images