CN114250616B

CN114250616B - Heat pump clothes dryer and control method and control device thereof

Info

Publication number: CN114250616B
Application number: CN202210041048.1A
Authority: CN
Inventors: 吴睿; 周杏标; 朱晓涵; 闫卓
Original assignee: Guangdong Meizhi Compressor Co Ltd
Current assignee: Guangdong Meizhi Compressor Co Ltd
Priority date: 2022-01-13
Filing date: 2022-01-13
Publication date: 2023-09-26
Anticipated expiration: 2042-01-13
Also published as: CN114250616A

Abstract

The invention discloses a heat pump clothes dryer, a control method and a control device thereof. The heat pump clothes dryer comprises a compressor, a heat exchange assembly, a clothes drying cylinder, a control valve assembly and a controller; the compressor has a plurality of working modes with different displacement; the heat exchange assembly is communicated with the compressor; the clothes drying cylinder is in heat exchange communication with the heat exchange assembly; the control valve assembly is connected with the compressor and is used for controlling the compressor to switch among the plurality of working modes; the controller is connected with the control valve assembly and is used for controlling the control valve assembly to switch the working mode of the compressor. The technical scheme of the invention can adjust the displacement of the compressor.

Description

Heat pump clothes dryer and control method and control device thereof

Technical Field

The invention relates to the technical field of heat pumps, in particular to a heat pump clothes dryer, a control method and a control device thereof.

Background

In the related art, the heat pump clothes dryer has different demands for the refrigerant in different operation modes, and the heat pump clothes dryer using the constant volume compressor has constant refrigerant discharge, resulting in mismatching of the refrigerant discharge of the compressor and the demand for the refrigerant in the operation mode of the heat pump clothes dryer, thereby generating redundant power consumption.

Disclosure of Invention

The invention mainly aims to provide a heat pump clothes dryer capable of adjusting the discharge capacity of a compressor, and a control method and a control device thereof.

In order to achieve the above purpose, the heat pump clothes dryer provided by the invention comprises a compressor, a heat exchange assembly, a clothes drying cylinder, a control valve assembly and a controller; the compressor has a plurality of working modes with different displacement; the heat exchange assembly is communicated with the compressor; the clothes drying cylinder is in heat exchange communication with the heat exchange assembly; the control valve assembly is connected with the compressor and is used for controlling the compressor to switch among the plurality of working modes; the controller is connected with the control valve assembly and is used for controlling the control valve assembly to switch the working mode of the compressor.

Optionally, the compressor is provided with a first compression cavity, a second compression cavity, an air inlet hole, an air exhaust hole and a bypass hole, the bypass hole is provided with a bypass valve, the first compression cavity and the second compression cavity are communicated with the air exhaust hole, the first compression cavity and the second compression cavity are communicated with the air inlet hole, the bypass hole is communicated with the first compression cavity, and the heat exchange component is communicated with the air inlet hole and the air exhaust hole; the plurality of working modes comprise a first working mode, a second working mode and a third working mode, and in the first working mode, a first compression cavity and a second compression cavity of the compressor work; in the second operating mode, the first compression chamber of the compressor operates; in the third mode of operation, the first compression chamber of the compressor is operated and the bypass valve is opened.

Optionally, the compressor includes a sliding vane, and one end of the sliding vane extends into the second compression cavity; the control valve assembly comprises a bypass control valve and a single-double cylinder switching valve, and the bypass control valve is used for controlling the on-off of the air inlet, the air outlet and the bypass hole; the single-double cylinder switching valve is used for controlling the on-off of the air inlet, the air outlet and one end of the sliding sheet, which is far away from the second compression cavity; in the first working mode, the bypass control valve is communicated with the bypass hole and the exhaust hole, and the single-double cylinder control valve is communicated with one end of the sliding sheet, which is away from the second compression cavity, and the exhaust hole; in the second working mode, the bypass control valve is communicated with the bypass hole and the exhaust hole, and the single-double cylinder control valve is communicated with one end of the sliding vane, which is away from the second compression cavity, and the air inlet hole; in the third working mode, the bypass control valve is communicated with the bypass hole and the air inlet hole, and the single-double cylinder control valve is communicated with one end of the sliding vane, which is away from the second compression cavity, and the air inlet hole.

Optionally, the bypass control valve is provided with a first high-pressure port, a first low-pressure port and a bypass port which are communicated with each other, the first high-pressure port is communicated with the exhaust hole, the first low-pressure port is communicated with the air inlet hole, and the bypass port is communicated with the bypass hole; the single-double cylinder switching valve is provided with a second high-pressure port, a second low-pressure port and a communication port which are communicated with each other, the second high-pressure port is communicated with the exhaust hole, the second low-pressure port is communicated with the air inlet hole, and the communication port is communicated with one end of the sliding vane, which is far away from the second compression cavity; in the first working mode, a first high-pressure port and a bypass port of the bypass control valve are opened, a first low-pressure port is closed, a second high-pressure port and a communication port of the single-double cylinder switching valve are opened, and a second low-pressure port is closed; in the second working mode, a first high-pressure port and a bypass port of the bypass control valve are opened, a first low-pressure port is closed, a second high-pressure port of the single-double cylinder switching valve is closed, and a second low-pressure port and a communication port are opened; in the third working mode, the first high-pressure port of the bypass control valve is closed, the first low-pressure port and the bypass port are opened, the second high-pressure port of the single-double cylinder switching valve is closed, and the second low-pressure port and the communication port are opened.

Optionally, the heat pump clothes dryer further comprises a humidity detector, wherein the humidity detector is connected with the controller, the humidity detector is arranged in the clothes drying cylinder, and the humidity detector is used for detecting the humidity value of clothes in the clothes drying cylinder.

The invention also provides a control method of the heat pump clothes dryer, which is used for the heat pump clothes dryer, and comprises a compressor and a control valve assembly, wherein the compressor is provided with a plurality of working modes with different displacement, and the control valve assembly is used for controlling the compressor to switch between the plurality of working modes; the control method of the heat pump clothes dryer comprises the following steps: acquiring an operation mode instruction; and controlling the control valve assembly to switch the compressor to a corresponding working mode according to the running mode instruction so as to enable the compressor to output the displacement in the corresponding working mode.

Optionally, the compressor is provided with a first compression cavity, a second compression cavity, an air inlet hole, an air exhaust hole and a bypass hole, the bypass hole is provided with a bypass valve, the first compression cavity and the second compression cavity are communicated with the air exhaust hole, the first compression cavity and the second compression cavity are communicated with the air inlet hole, the bypass hole is communicated with the first compression cavity, the compressor comprises a sliding sheet, and one end of the sliding sheet extends into the second compression cavity; the control valve assembly comprises a bypass control valve and a single-double cylinder switching valve, and the bypass control valve is used for communicating the air inlet hole, the air outlet hole and the bypass hole; the single-double cylinder switching valve is used for communicating an exhaust hole, an air inlet hole and one end of the sliding sheet, which is away from the second compression cavity; the operation mode instruction comprises a first operation mode instruction, a second operation mode instruction and a third operation mode instruction; the step of controlling the control valve assembly to switch the compressor to the corresponding working mode according to the operation mode command so that the compressor outputs the displacement in the corresponding working mode comprises the following steps: if the operation mode instruction is a first operation mode instruction, controlling the bypass control valve to communicate the bypass hole with the exhaust hole, and controlling the single-double cylinder control valve to communicate one end of the sliding vane, which is far away from the second compression cavity, with the exhaust hole; if the operation mode instruction is a second operation mode instruction, controlling the bypass control valve to communicate the bypass hole with the exhaust hole, and controlling the single-double cylinder control valve to communicate one end of the sliding vane, which is away from the second compression cavity, with the air inlet hole; and if the operation mode instruction is a third operation mode instruction, controlling the bypass control valve to be communicated with the bypass hole and the air inlet hole, and controlling the single-double cylinder control valve to be communicated with one end of the sliding vane, which is away from the second compression cavity, and the air inlet hole.

Optionally, the bypass control valve is provided with a first high-pressure port, a first low-pressure port and a bypass port which are communicated with each other, the first high-pressure port is communicated with the exhaust hole, the first low-pressure port is communicated with the air inlet hole, and the bypass port is communicated with the bypass hole; the single-double cylinder switching valve is provided with a second high-pressure port, a second low-pressure port and a communication port which are communicated with each other, the second high-pressure port is communicated with the exhaust hole, the second low-pressure port is communicated with the air inlet hole, and the communication port is communicated with one end of the sliding vane, which is far away from the second compression cavity; and if the operation mode instruction is a first operation mode instruction, controlling the bypass control valve to be communicated with the bypass hole and the exhaust hole, and controlling the single-double cylinder control valve to be communicated with one end of the sliding vane, which is far away from the second compression cavity, and the exhaust hole, wherein the step of controlling the single-double cylinder control valve to be communicated with the bypass hole and the exhaust hole comprises the following steps: if the operation mode instruction is a first operation mode instruction, controlling a first high-pressure port and a bypass port of the bypass control valve to be opened, controlling a first low-pressure port to be closed, and controlling a second high-pressure port and a communication port of the single-double cylinder switching valve to be opened and controlling a second low-pressure port to be closed; and if the operation mode instruction is a second operation mode instruction, controlling the bypass control valve to be communicated with the bypass hole and the exhaust hole, and controlling the single-double cylinder control valve to be communicated with one end of the sliding vane, which is away from the second compression cavity, and the air inlet hole, wherein the step of controlling the single-double cylinder control valve to be communicated with the sliding vane comprises the following steps: if the operation mode instruction is the second operation mode instruction, controlling a first high-pressure port and a bypass port of the bypass control valve to be opened, closing a first low-pressure port, and controlling a second high-pressure port and a second low-pressure port of the single-double cylinder switching valve to be closed and a communication port to be opened; and if the operation mode instruction is a third operation mode instruction, controlling the bypass control valve to communicate the bypass hole with the air inlet, and controlling the single-double cylinder control valve to communicate one end of the sliding vane, which is away from the second compression cavity, with the air inlet, wherein the step of controlling the single-double cylinder control valve to communicate the sliding vane with the air inlet comprises the following steps: and if the operation mode instruction is the third operation mode instruction, controlling the first high-pressure port of the bypass control valve to be closed, controlling the first low-pressure port and the bypass port to be opened, and controlling the second high-pressure port of the single-double cylinder switching valve to be closed and controlling the second low-pressure port and the communication port to be opened.

Optionally, the heat pump clothes dryer further comprises a humidity detector; after the step of controlling the control valve assembly to switch the compressor to the corresponding working mode according to the operation mode command so that the compressor outputs the displacement in the corresponding working mode, the method further comprises: and controlling a humidity detector to detect the humidity value of clothes in the clothes drying cylinder, judging whether the humidity value is smaller than a preset humidity value, and controlling the heat pump clothes dryer to stop when the humidity value is smaller than the preset humidity value.

The invention also proposes a control device of a heat pump clothes dryer, comprising a memory, a processor and a heat pump clothes dryer control program stored in the memory and executable by the processor, the processor implementing the control method of the heat pump clothes dryer according to any one of the preceding claims when executing the heat pump clothes dryer control program.

According to the technical scheme, the controller controls the control valve assembly to switch the working mode of the compressor, so that the compressor outputs the refrigerant with the discharge capacity corresponding to the working mode, the refrigerant is matched with the demand of the heat pump clothes dryer in the operation mode, and further the generation of redundant power consumption is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a heat pump dryer according to an embodiment of the present invention;

FIG. 2 is a flow chart of an embodiment of a control method of the heat pump dryer of the present invention;

FIG. 3 is a flow chart of another embodiment of a control method of the heat pump dryer of the present invention;

FIG. 4 is a flow chart of a further embodiment of a method of controlling a heat pump dryer of the present invention;

FIG. 5 is a flow chart of a further embodiment of a control method of the heat pump dryer of the present invention;

fig. 6 is a schematic hardware configuration of a control device of the heat pump clothes dryer of the present invention.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				100	Heat pump clothes dryer	30	Clothes drying cylinder
10	Compressor	40	Control valve assembly
				11	First compression chamber	41	Bypass control valve
12	Second compression chamber	411	First high pressure port
				13	Air inlet hole	412	First low pressure port
14	Exhaust hole	413	Bypass port
				15	Bypass hole	42	Single-double cylinder switching valve
16	Sliding vane	421	Second high pressure port
				20	Heat exchange assembly	422	Second low pressure port
21	Condenser	423	Communication port
				22	Throttling element	50	Heat exchange air duct
23	Evaporator

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

The present invention proposes a heat pump clothes dryer 100.

In an embodiment of the present invention, as shown in fig. 1, the heat pump clothes dryer 100 includes a compressor 10, a heat exchange assembly 20, and a clothes dryer cylinder 30; the heat exchange assembly 20 is in communication with the compressor 10; the dryer cylinder 30 is in heat exchange communication with the heat exchange assembly 20.

In this embodiment, the drying drum 30 is used to contain laundry to be dried. The heat pump clothes dryer 100 further comprises a heat exchange air duct 50, the clothes drying cylinder 30 is in heat exchange communication with the heat exchange assembly 20 through the heat exchange air duct 50, and air in the heat exchange air duct 50 exchanges heat with the heat exchange assembly 20 to improve the temperature of air in the heat exchange air duct 50, and air in the heat exchange air duct 50 enters the accommodating cavity, so that clothes to be dried in the accommodating cavity are dried.

In this embodiment, the compressor 10 is configured to compress a refrigerant, make the refrigerant in a high-temperature and high-pressure state, and discharge the compressed refrigerant to the heat exchange assembly 20, and after the high-temperature and high-pressure refrigerant exchanges heat with air in the heat exchange air duct 50 in the heat exchange assembly 20, the refrigerant becomes a low-temperature and low-pressure refrigerant, and then is conveyed back to the compressor 10 for compression, so that the refrigerant circulates.

In this embodiment, the heat exchange assembly 20 includes a condenser 21, a throttling element 22 and an evaporator 23, the condenser 21 and the evaporator 23 are disposed in the heat exchange air duct 50, the compressor 10, the condenser 21, the throttling element 22 and the evaporator 23 are sequentially communicated through pipes, the high-temperature and high-pressure refrigerant discharged from the compressor 10 exchanges heat with the air in the heat exchange air duct 50 through the condenser 21, and the air absorbs heat of the refrigerant to raise the temperature of the air, thereby ensuring the clothes drying effect of the heat pump clothes dryer 100. The throttling element 22 may be a member having a throttling function, such as a capillary tube, a thermal expansion valve, or an electronic expansion valve.

The displacement of the compressor 10 refers to the amount of refrigerant compressed by the compressor 10 and discharged into the heat exchange assembly 20. This portion of the refrigerant exchanges heat with the air in the heat exchange assembly 20 and the heat exchange duct 50 to lose energy, and the portion of the refrigerant that actually compresses to perform work is also the portion of the refrigerant that loses energy.

It will be appreciated that the heat pump dryer 100 has different refrigerant demands in different modes of operation. For example, the heat pump clothes dryer 100 has a first operation mode and a second operation mode, wherein the drying temperature in the first operation mode is higher than that in the second operation mode, that is, the demand of the heat pump clothes dryer 100 for the refrigerant in the second operation mode is lower than that of the heat pump clothes dryer 100 in the first operation mode, and if the discharge capacity of the compressor 10 is unchanged, the compressor 10 generates excessive power consumption when the heat pump clothes dryer 100 is in the second operation mode.

In order to match the displacement of the compressor 10 with the refrigerant demand of the heat pump clothes dryer 100 in different operation modes, and avoid generating excessive power consumption, in the heat pump clothes dryer 100 of the present invention, the compressor 10 has a plurality of operation modes with different displacement; a control valve assembly 40 and a controller are further added in the heat pump clothes dryer 100, the control valve assembly 40 is connected with the compressor 10, and the control valve assembly 40 is used for controlling the compressor 10 to switch between the multiple working modes; the controller is connected to the control valve assembly 40, and the controller is configured to control the control valve assembly 40 to switch the working mode of the compressor 10.

According to the technical scheme, the controller controls the control valve assembly 40 to switch the working mode of the compressor 10, so that the compressor 10 outputs the refrigerant with the discharge capacity corresponding to the working mode, and the refrigerant is matched with the demand of the operation mode of the heat pump clothes dryer 100, so that the generation of redundant power consumption is avoided.

In this embodiment, the compressor 10 has three modes of operation. In other embodiments, the compressor 10 may have two modes of operation and four modes of operation, which are not particularly limited.

In one embodiment, as shown in fig. 1, the compressor 10 has a first compression chamber 11, a second compression chamber 12, an air inlet hole 13, an air outlet hole 14, and a bypass hole 15, wherein the bypass hole 15 is provided with a bypass valve, the first compression chamber 11 and the second compression chamber 12 are both communicated with the air outlet hole 14, the first compression chamber 11 and the second compression chamber 12 are both communicated with the air inlet hole 13, the bypass hole 15 is communicated with the first compression chamber 11, and the heat exchange assembly 20 is communicated with the air inlet hole 13 and the air outlet hole 14; the plurality of operation modes include a first operation mode, a second operation mode, and a third operation mode, in which the first compression chamber 11 and the second compression chamber 12 of the compressor 10 operate; in the second operation mode, the first compression chamber 11 of the compressor 10 is operated; in the third operation mode, the first compression chamber 11 of the compressor 10 is operated and the bypass valve is opened.

In this embodiment, the bypass valve is a back pressure valve, the side of the bypass valve facing the inside of the compressor 10 is a valve inside, the side of the bypass valve facing away from the inside of the compressor 10 is a valve outside, the bypass valve is opened when the pressure inside the valve is greater than the pressure outside the valve, and the bypass valve is closed when the pressure inside the valve is less than or equal to the pressure outside the valve.

It will be appreciated that the portion of the refrigerant compressed in the first compression chamber 11 is discharged from the compressor 10 through the bypass hole 15, does not flow through the heat exchange assembly 20, passes through the air intake hole 13 of the compressor 10 and returns to the compressor 10 again, and thus, the power consumption of the compressor 10 is reduced because the portion of the refrigerant does not participate in heat exchange and the energy loss is little, and thus, the portion of the refrigerant is returned to the first compression chamber 11 again to be compressed, and the work the compressor 10 does on the portion of the refrigerant is little.

In the present embodiment, the compressor 10 is a twin-cylinder rotary compressor 10. The first working mode of the compressor 10 is a double-cylinder working mode, the second working mode of the compressor 10 is a single-cylinder working mode, and the third working mode of the compressor 10 is a single-cylinder bypass working mode, namely the displacement of the compressor 10 in the first working mode, the second working mode and the third working mode is reduced in sequence. The present embodiment controls the compressor 10 to be switched among the first, second and third operation modes by the control valve assembly 40 to control the displacement of the compressor 10 so as to match the operation mode of the heat pump dryer 100.

The compressor 10 is in a first operation mode, the first compression chamber 11 and the second compression chamber 12 simultaneously compress refrigerant, so that the displacement of the compressor 10 in the first operation mode is highest in three operation modes; in the second operation mode of the compressor 10, the first compression chamber 11 compresses the refrigerant, and the second compression chamber 12 does not operate, so that the displacement of the compressor 10 in the second operation mode is in the middle position in the three operation modes; in the third operation mode of the compressor 10, the first compression chamber 11 compresses the refrigerant, the second compression chamber 12 does not operate, and a portion of the refrigerant compressed by the first compression chamber 11 is discharged through the bypass hole 15 without entering the heat exchange assembly 20, so that the displacement of the compressor 10 in the third operation mode is minimized in the three operation modes.

In other embodiments, the bypass hole 15 may be in communication with the second compression chamber 12, such that the second compression chamber 12 is operated and the first compression chamber 11 is not operated in the second and third operation modes of the compressor 10.

In one embodiment, as shown in fig. 1, the compressor 10 includes a sliding vane 16, and one end of the sliding vane 16 extends into the second compression chamber 12; the control valve assembly 40 comprises a bypass control valve 41 and a single-double cylinder switching valve 42, wherein the bypass control valve 41 is used for controlling the on-off of the air inlet hole 13, the air outlet hole 14 and the bypass hole 15; the single-double cylinder switching valve 42 is used for controlling the on-off of the air inlet hole 13, the air outlet hole 14 and one end of the sliding sheet 16, which is far away from the second compression cavity 12; in the first working mode, the bypass control valve 41 communicates the bypass hole 15 with the exhaust hole 14, and the single-double cylinder control valve communicates one end of the sliding vane 16 away from the second compression chamber 12 with the exhaust hole 14; in the second working mode, the bypass control valve 41 communicates the bypass hole 15 with the exhaust hole 14, and the single-double cylinder control valve communicates one end of the sliding vane 16 away from the second compression chamber 12 with the air inlet hole 13; in the third working mode, the bypass control valve 41 is connected to the bypass hole 15 and the air inlet hole 13, and the single-double cylinder control valve is connected to one end of the sliding vane 16, which is away from the second compression chamber 12, and the air inlet hole 13.

It will be appreciated that the compressor 10 further includes a main bearing, an auxiliary bearing, a cylinder, and an eccentric rolling rotor, the cylinder is disposed between the main bearing and the auxiliary bearing, the main bearing, the auxiliary bearing, and the cylinder enclose a compression chamber, the eccentric rolling rotor is disposed in the compression chamber, one end of the sliding vane 16 extends into the compression chamber to abut against the eccentric rolling rotor, the compression chamber has an air inlet side and an air outlet side, and the sliding vane 16 is disposed between the air inlet side and the air outlet side. When the compressor 10 compresses the refrigerant, the eccentric rolling rotor rotates to make the sliding vane 16 in contact with the refrigerant slide back and forth in the compression chamber, so that the refrigerant with low temperature and low pressure entering the compression chamber from the inlet side is continuously compressed when moving to the outlet side, and the refrigerant with high temperature and high pressure is discharged from the outlet side to the compression chamber.

It will be appreciated that the cylinder is provided with a chute in which the slide 16 slides, a chamber being provided on the side of the cylinder remote from the compression chamber in which the end of the slide 16 remote from the second compression chamber 12 is located, and the single double cylinder switching valve 42 communicates with the chamber and thus with the end of the slide 16 remote from the second compression chamber 12.

It is understood that the bypass control valve 41 and the single-double cylinder switching valve 42 may be three-way valves or four-way valves, or may be a plurality of switching valves disposed on the respective pipes.

In the present embodiment, the inlet port 13 of the compressor 10 is at low pressure and the outlet port 14 of the compressor 10 is at high pressure.

In the first working mode of the compressor 10, the bypass hole 15 is communicated with the exhaust hole 14, so that the valve outer side of the exhaust valve is high pressure, the exhaust valve is closed, one end of the sliding vane 16, which is away from the second compression cavity 12, is communicated with the exhaust hole 14, the end of the sliding vane 16, which is away from the second compression cavity 12, is high pressure, and the sliding vane 16 is always abutted against the eccentric rolling rotor, so that the first compression cavity 11 and the second compression cavity 12 are both in working states, and the refrigerant is compressed.

In the second working mode of the compressor 10, the bypass hole 15 is communicated with the exhaust hole 14, so that the valve outer side of the exhaust valve is high pressure, the exhaust valve is closed, one end of the sliding vane 16, which is away from the second compression cavity 12, is communicated with the air inlet hole 13, the end of the sliding vane 16, which is away from the second compression cavity 12, is low pressure, and the sliding vane 16 cannot abut against the eccentric rolling rotor, so that the first compression cavity 11 is in a working state, the refrigerant is compressed, and the second compression cavity 12 is in a non-working state and does not compress the refrigerant.

In the third working mode of the compressor 10, the bypass hole 15 is communicated with the air inlet hole 13, so that the valve outer side of the exhaust valve is low pressure, the exhaust valve is opened, one end of the sliding vane 16, which is away from the second compression cavity 12, is communicated with the air inlet hole 13, one end of the sliding vane 16, which is away from the second compression cavity 12, is low pressure, and the sliding vane 16 cannot abut against the eccentric rolling rotor, so that the first compression cavity 11 is in a bypass working state, part of refrigerant compressed by the first compression cavity 11 is discharged from the bypass hole 15, the refrigerant is compressed, the second compression cavity 12 is in a non-working state, and the refrigerant is not compressed.

In an embodiment, as shown in fig. 1, the bypass control valve 41 has a first high pressure port 411, a first low pressure port 412 and a bypass port 413 which are communicated with each other, the first high pressure port 411 is communicated with the exhaust hole 14, the first low pressure port 412 is communicated with the intake hole 13, and the bypass port 413 is communicated with the bypass hole 15; the single-double cylinder switching valve 42 is provided with a second high-pressure port 421, a second low-pressure port 422 and a communication port 423 which are communicated with each other, the second high-pressure port 421 is communicated with the exhaust hole 14, the second low-pressure port 422 is communicated with the air inlet hole 13, and the communication port 423 is communicated with one end of the sliding vane 16 away from the second compression cavity 12; in the first operation mode, the first high pressure port 411 and the bypass port 413 of the bypass control valve 41 are opened, the first low pressure port 412 is closed, the second high pressure port 421 and the communication port 423 of the single/double cylinder switching valve 42 are opened, and the second low pressure port 422 is closed; in the second operation mode, the first high pressure port 411 and the bypass port 413 of the bypass control valve 41 are opened, the first low pressure port 412 is closed, the second high pressure port 421 of the single/double cylinder switching valve 42 is closed, and the second low pressure port 422 and the communication port 423 are opened; in the third operation mode, the first high pressure port 411 of the bypass control valve 41 is closed, the first low pressure port 412 and the bypass port 413 are opened, the second high pressure port 421 of the single/double cylinder switching valve 42 is closed, and the second low pressure port 422 and the communication port 423 are opened.

In the present embodiment, the bypass control valve 41 and the single double cylinder switching valve 42 are three-way valves.

In the first working mode of the compressor 10, the first high pressure port 411 is communicated with the bypass port 413 to communicate the bypass port 15 with the exhaust hole 14, so that the valve outer side of the exhaust valve is high pressure, the exhaust valve is closed, the second high pressure port 421 is communicated with the communication port 423 to communicate one end of the sliding vane 16 deviating from the second compression cavity 12 with the exhaust hole 14, so that one end of the sliding vane 16 deviating from the second compression cavity 12 is high pressure, and the sliding vane 16 always abuts against the eccentric rolling rotor, so that the first compression cavity 11 and the second compression cavity 12 are both in working states, and refrigerant is compressed.

In the second working mode of the compressor 10, the first high pressure port 411 is communicated with the bypass port 413 to communicate the bypass port 15 with the exhaust hole 14, so that the valve outer side of the exhaust valve is at high pressure, the exhaust valve is closed, the second low pressure port 422 is communicated with the communication port 423 to communicate one end of the sliding vane 16 deviating from the second compression cavity 12 with the air inlet hole 13, so that one end of the sliding vane 16 deviating from the second compression cavity 12 is at low pressure, and the sliding vane 16 cannot abut against the eccentric rolling rotor, so that the first compression cavity 11 is in a working state to compress the refrigerant, and the second compression cavity 12 is in a non-working state to not compress the refrigerant.

In the third working mode of the compressor 10, the first low pressure port 412 is communicated with the bypass port 413 to communicate the bypass hole 15 with the air inlet hole 13, so that the valve outer side of the air outlet valve is low pressure, the air outlet valve is opened, the second low pressure port 422 is communicated with the communication port 423 to communicate one end of the sliding vane 16 deviating from the second compression cavity 12 with the air inlet hole 13, so that one end of the sliding vane 16 deviating from the second compression cavity 12 is low pressure, the sliding vane 16 cannot abut against the eccentric rolling rotor, so that the first compression cavity 11 is in a bypass working state, part of refrigerant compressed by the first compression cavity 11 is discharged from the bypass hole 15 to compress the refrigerant, and the second compression cavity 12 is in a non-working state and does not compress the refrigerant.

In one embodiment, as shown in fig. 1, the heat pump clothes dryer 100 further includes a humidity detector, which is connected to the controller, and is disposed in the drying drum 30, and is configured to detect a humidity value of the laundry in the drying drum 30.

In this embodiment, the humidity detector is used to detect the resistance value of the laundry. It will be appreciated that the resistance of the laundry changes with the change of humidity, the laundry in the drum 30 will contact with the humidity detector during the drying process, so as to obtain the resistance value of the laundry, the humidity detector sends the obtained resistance value to the controller, the controller obtains the humidity value of the laundry, compares the humidity value of the laundry with the preset humidity value, if the humidity value of the laundry is smaller than the preset humidity value, i.e. the laundry in the drum 30 has been dried, the controller controls the heat pump dryer 100 to stop, and if the humidity value of the laundry is greater than or equal to the preset humidity value, i.e. the laundry in the drum 30 is still in a wet state, the controller controls the heat pump dryer 100 to continue to operate for drying the laundry.

In addition, the invention also provides a control method of the heat pump clothes dryer 100, which is used for controlling the displacement of the compressor 10 in the heat pump clothes dryer 100, so as to control the power consumption of the compressor 10, and further avoid the unnecessary power consumption of the compressor 10.

As shown in fig. 1 and 2, in an embodiment of the present invention, the heat pump clothes dryer 100 includes a compressor 10, a heat exchange assembly 20, a clothes drying drum 30, a controller and a control valve assembly 40, wherein the compressor 10 has a plurality of operation modes with different displacement, the compressor 10 is communicated with the heat exchange assembly 20, the clothes drying drum 30 is communicated with the heat exchange assembly 20 in a heat exchange manner, the control valve assembly 40 is used for controlling the compressor 10 to switch between the plurality of operation modes, and the controller is connected with the control valve assembly 40. The control method of the heat pump clothes dryer 100 includes the steps of:

step S10, an operation mode instruction is acquired.

It will be appreciated that the heat pump clothes dryer 100 has a plurality of modes of operation, with the heat pump clothes dryer 100 having different demands for refrigerant in different modes of operation. The operation mode instruction is acquired by the controller to determine the operation mode of the heat pump clothes dryer 100, thereby determining the amount of refrigerant required by the heat pump clothes dryer 100.

Step S20, controlling the control valve assembly 40 to switch the compressor 10 to the corresponding working mode according to the operation mode command, so that the compressor 10 outputs the displacement in the corresponding working mode.

It will be appreciated that the compressor 10 has a plurality of modes of operation, with the displacement of the compressor 10 being different in the different modes of operation. The controller can obtain the demand of the heat pump clothes dryer 100 for the refrigerant according to the operation mode command, and according to the demand of the heat pump clothes dryer 100 for the refrigerant, the controller controls the control valve assembly 40 to switch the compressor 10 to the operation mode with the discharge capacity matched with the demand, so as to control the discharge capacity of the compressor 10, enable the discharge capacity of the compressor 10 to correspond to the operation mode of the heat pump clothes dryer 100, and further avoid the unnecessary power consumption of the compressor 10.

In an embodiment, as shown in fig. 1 and 3, the compressor 10 is a dual-cylinder rotary compressor 10, the compressor 10 has a first compression chamber 11, a second compression chamber 12, an air inlet hole 13, an air outlet hole 14 and a bypass hole 15, the bypass hole 15 is provided with a bypass valve, the first compression chamber 11 and the second compression chamber 12 are both communicated with the air outlet hole 14, the first compression chamber 11 and the second compression chamber 12 are both communicated with the air inlet hole 13, the bypass hole 15 is communicated with the first compression chamber 11, the heat exchange assembly 20 is communicated with the air inlet hole 13 and the air outlet hole 14, the compressor 10 comprises a sliding sheet 16, and one end of the sliding sheet 16 extends into the second compression chamber 12; the control valve assembly 40 comprises a bypass control valve 41 and a single-double cylinder switching valve 42, the controller is respectively connected with the bypass control valve 41 and the single-double cylinder switching valve 42, and the bypass control valve 41 is used for communicating the air inlet hole 13, the air outlet hole 14 and the bypass hole 15; the single-double cylinder switching valve 42 is used for communicating the exhaust hole 14, the air inlet hole 13 and one end of the sliding sheet 16, which is away from the second compression cavity 12.

The compressor 10 has a first working mode, a second working mode and a third working mode, the displacement of which is reduced in sequence, the first working mode of the compressor 10 is a double-cylinder working mode, and the first compression cavity 11 and the second compression cavity 12 compress the refrigerant at the same time; the second operation mode of the compressor 10 is a single cylinder operation mode, the first compression chamber 11 compresses the refrigerant, and the second compression chamber 12 does not operate; the third operation mode of the compressor 10 is a single-cylinder bypass operation mode, the first compression chamber 11 compresses the refrigerant, the second compression chamber 12 does not operate, and a portion of the refrigerant compressed by the first compression chamber 11 is discharged through the bypass hole 15 without entering the heat exchange assembly 20.

The bypass valve is a back pressure valve, the side of the bypass valve facing the inside of the compressor 10 is a valve inner side, the side of the bypass valve facing away from the inside of the compressor 10 is a valve outer side, when the pressure of the valve inner side is larger than the pressure of the valve outer side, the bypass valve is opened, and when the pressure of the valve inner side is smaller than or equal to the pressure of the valve outer side, the bypass valve is closed.

It will be appreciated that the compressor 10 further includes an eccentric rolling rotor disposed within the compression chamber, which requires the slide 16 to be in constant abutment with the eccentric rolling rotor to compress the refrigerant. In operation of the compressor 10, the inlet 13 is at low pressure and the outlet 14 is at high pressure.

In this embodiment, the operation mode instruction includes a first operation mode instruction, a second operation mode instruction, and a third operation mode instruction.

It can be understood that a first operation mode instruction, a second operation mode instruction and a third operation mode instruction are preset in the controller, and after the controller obtains the operation mode instruction, the controller judges whether the obtained operation mode instruction is any instruction among the preset first operation mode instruction, second operation mode instruction and third operation mode instruction, and operates according to the preset operation mode instruction.

The step S20 includes:

in step S21, if the operation mode command is the first operation mode command, the bypass control valve 41 is controlled to communicate the bypass hole 15 with the exhaust hole 14, and the single-double cylinder control valve is controlled to communicate one end of the slide sheet 16, which is away from the second compression chamber 12, with the exhaust hole 14.

It will be appreciated that the controller controls the bypass control valve 41 and the single double cylinder switching valve 42 to switch valve positions in accordance with the first operating mode command to place the compressor 10 in the first operating mode. In the first working mode of the compressor 10, the bypass hole 15 is communicated with the exhaust hole 14, so that the valve outer side of the exhaust valve is high pressure, the exhaust valve is closed, one end of the sliding vane 16, which is away from the second compression cavity 12, is communicated with the exhaust hole 14, the end of the sliding vane 16, which is away from the second compression cavity 12, is high pressure, and the sliding vane 16 is always abutted against the eccentric rolling rotor, so that the first compression cavity 11 and the second compression cavity 12 are both in working states, and the refrigerant is compressed.

Step S22, if the operation mode command is a second operation mode command, controlling the bypass control valve 41 to communicate the bypass hole 15 with the exhaust hole 14, and controlling the single-double cylinder control valve to communicate the end of the sliding vane 16 away from the second compression chamber 12 with the air inlet hole 13.

It will be appreciated that the controller controls the bypass control valve 41 and the single double cylinder switching valve 42 to switch valve positions in accordance with the second operating mode command to place the compressor 10 in the second operating mode. In the second working mode of the compressor 10, the bypass hole 15 is communicated with the exhaust hole 14, so that the valve outer side of the exhaust valve is high pressure, the exhaust valve is closed, one end of the sliding vane 16, which is away from the second compression cavity 12, is communicated with the air inlet hole 13, the end of the sliding vane 16, which is away from the second compression cavity 12, is low pressure, and the sliding vane 16 cannot abut against the eccentric rolling rotor, so that the first compression cavity 11 is in a working state, the refrigerant is compressed, and the second compression cavity 12 is in a non-working state and does not compress the refrigerant.

In step S23, if the operation mode command is a third operation mode command, the bypass control valve 41 is controlled to communicate the bypass hole 15 with the air inlet hole 13, and the single-double cylinder control valve is controlled to communicate one end of the sliding vane 16, which is away from the second compression chamber 12, with the air inlet hole 13.

It will be appreciated that the controller controls the bypass control valve 41 and the single double cylinder switching valve 42 to switch valve positions in accordance with the third operating mode command to place the compressor 10 in the third operating mode. In the third working mode of the compressor 10, the bypass hole 15 is communicated with the air inlet hole 13, so that the valve outer side of the exhaust valve is low pressure, the exhaust valve is opened, one end of the sliding vane 16, which is away from the second compression cavity 12, is communicated with the air inlet hole 13, one end of the sliding vane 16, which is away from the second compression cavity 12, is low pressure, and the sliding vane 16 cannot abut against the eccentric rolling rotor, so that the first compression cavity 11 is in a bypass working state, part of refrigerant compressed by the first compression cavity 11 is discharged from the bypass hole 15, the refrigerant is compressed, the second compression cavity 12 is in a non-working state, and the refrigerant is not compressed.

In one embodiment, as shown in fig. 1 and 4, the bypass control valve 41 and the single double cylinder switching valve 42 are both three-way valves or four-way valves. The bypass control valve 41 has a first high-pressure port 411, a first low-pressure port 412 and a bypass port 413 which are communicated with each other, the first high-pressure port 411 being communicated with the exhaust hole 14, the first low-pressure port 412 being communicated with the intake hole 13, the bypass port 413 being communicated with the bypass hole 15; the single-double cylinder switching valve 42 is provided with a second high-pressure port 421, a second low-pressure port 422 and a communication port 423 which are mutually communicated, the second high-pressure port 421 is communicated with the exhaust hole 14, the second low-pressure port 422 is communicated with the air inlet hole 13, and the communication port 423 is communicated with one end of the sliding vane 16, which is far away from the second compression cavity 12.

In this embodiment, the step S21 includes:

in step S211, if the operation mode command is the first operation mode command, the first high-pressure port 411 and the bypass port 413 of the bypass control valve 41 are controlled to be opened, the first low-pressure port 412 is controlled to be closed, the second high-pressure port 421 and the communication port 423 of the single/double cylinder switching valve 42 are controlled to be opened, and the second low-pressure port 422 is controlled to be closed.

It will be appreciated that, in the first operation mode of the compressor 10, the first high pressure port 411 is communicated with the bypass port 413 to communicate the bypass port 15 with the exhaust hole 14, so that the valve outer side of the exhaust valve is high pressure, the exhaust valve is closed, the second high pressure port 421 is communicated with the communication port 423 to communicate one end of the sliding vane 16 away from the second compression chamber 12 with the exhaust hole 14, so that one end of the sliding vane 16 away from the second compression chamber 12 is high pressure, and the sliding vane 16 always abuts against the eccentric rolling rotor, so that the first compression chamber 11 and the second compression chamber 12 are both in an operation state to compress the refrigerant.

In this embodiment, the step S22 includes:

in step S221, if the operation mode command is the second operation mode command, the first high-pressure port 411 and the bypass port 413 of the bypass control valve 41 are controlled to be opened, the first low-pressure port 412 is closed, the second high-pressure port 421 of the single-double cylinder switching valve 42 is controlled to be closed, and the second low-pressure port 422 and the communication port 423 are controlled to be opened.

It will be appreciated that, in the second operation mode of the compressor 10, the first high pressure port 411 is communicated with the bypass port 413 to communicate the bypass port 15 with the exhaust hole 14, so that the valve outer side of the exhaust valve is at high pressure, the exhaust valve is closed, the second low pressure port 422 is communicated with the communication port 423 to communicate one end of the slide 16 away from the second compression chamber 12 with the air inlet hole 13, so that one end of the slide 16 away from the second compression chamber 12 is at low pressure, and the slide 16 cannot abut against the eccentric rolling rotor, thereby enabling the first compression chamber 11 to be in an operating state, compressing the refrigerant, and the second compression chamber 12 to be in an inactive state, and not compressing the refrigerant.

In this embodiment, the step S23 includes:

in step S231, if the operation mode command is the third operation mode command, the first high-pressure port 411 of the bypass control valve 41 is controlled to be closed, the first low-pressure port 412 and the bypass port 413 are controlled to be opened, the second high-pressure port 421 of the single-double cylinder switching valve 42 is controlled to be closed, and the second low-pressure port 422 and the communication port 423 are controlled to be opened.

It will be appreciated that in the third operation mode of the compressor 10, the first low pressure port 412 is communicated with the bypass port 413 to communicate the bypass port 15 with the air intake hole 13, so that the valve outer side of the air exhaust valve is low pressure, the air exhaust valve is opened, the second low pressure port 422 is communicated with the communication port 423 to communicate one end of the slide 16 away from the second compression chamber 12 with the air intake hole 13, so that one end of the slide 16 away from the second compression chamber 12 is low pressure, the slide 16 cannot abut against the eccentric rolling rotor, so that the first compression chamber 11 is in a bypass operation state, part of refrigerant compressed by the first compression chamber 11 is discharged from the bypass port 15 to compress the refrigerant, and the second compression chamber 12 is in a non-operation state and does not compress the refrigerant.

In one embodiment, as shown in fig. 1 and 5, the heat pump clothes dryer 100 further includes a humidity detector, which is connected to the controller, and is disposed in the drying drum 30, and is configured to detect a humidity value of the laundry in the drying drum 30.

In the present embodiment, after performing step S20, the control method of the heat pump clothes dryer 100 further includes:

in step S30, the humidity detector is controlled to detect the humidity value of the clothes in the clothes drying drum 30, determine whether the humidity value is smaller than a preset humidity value, and control the heat pump clothes dryer 100 to stop when the humidity value is smaller than the preset humidity value.

It will be appreciated that the controller controls the humidity detector to detect a humidity value within the drum 30, the controller compares the detected humidity value with a preset humidity value, if the detected humidity value is less than the preset humidity value, the controller controls the heat pump dryer 100 to stop, and if the detected humidity value is greater than or equal to the preset humidity value, the controller controls the heat pump dryer 100 to continue to operate in the current operating mode.

It is understood that the humidity detector has a detecting state and a standby state, and is in the detecting state when the humidity detector detects the humidity of the laundry, and is in the standby state when the humidity detector stops detecting the humidity of the laundry. The humidity detector may be a real-time detection, i.e. the humidity detector is always in a detection state, and detects the humidity value of the laundry in the laundry dryer drum 30 in real time until the humidity detector detects that the humidity value of the laundry is smaller than a preset humidity value, and the controller controls the heat pump laundry dryer 100 to stop. The humidity detector may be a discontinuous detection, that is, the humidity detector switches from a standby state to a detection state every a predetermined period of time, detects the humidity value of the laundry in the drum 30, and switches back to the standby state after detecting the humidity value of the laundry. The preset duration is, for example, but not limited to, 10 seconds, 20 seconds, 30 seconds.

In this embodiment, the humidity detector detects the humidity value of the laundry by detecting the resistance of the laundry. It will be appreciated that the resistance of the laundry changes with the change in its humidity, and the laundry in the drum 30 is contacted by the humidity sensor during the drying process, so as to obtain the resistance value of the laundry, and the humidity sensor sends the obtained resistance value to the controller, which obtains the humidity value of the laundry.

The invention also provides a control device of the heat pump clothes dryer 100, which can be used in the heat pump clothes dryer 100.

As shown in fig. 6, in an embodiment of the present invention, the control device of the heat pump clothes dryer 100 includes:

a memory 1003;

a processor 1002; and

a heat pump dryer control program stored in the memory 1003 and executable by the processor 1002, the processor 1002 implementing the control method of the heat pump dryer as described above when executing the control program of the heat pump dryer.

In this embodiment, the memory 1003 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory, and the memory 1003 may be a storage device independent of the control device; the processor 1002 may be a CPU. The memory 1003 and the processor 1002 are connected by a communication bus 1001, and the communication bus 1001 may be a UART bus or an I2C bus. It will be appreciated that other related programs may be provided in the control device to drive other functional units and modules in the heat pump dryer 100 to operate.

The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.

Claims

1. A heat pump clothes dryer, comprising:

a compressor having a plurality of operation modes of different displacement;

the heat exchange assembly is communicated with the compressor;

the clothes drying cylinder is communicated with the heat exchange assembly in a heat exchange manner;

a control valve assembly coupled to the compressor, the control valve assembly configured to control the compressor to switch between the plurality of modes of operation; the method comprises the steps of,

the controller is connected with the control valve assembly and is used for controlling the control valve assembly to switch the working mode of the compressor;

the compressor is provided with a first compression cavity, a second compression cavity, an air inlet, an air exhaust hole and a bypass hole, the bypass hole is provided with a bypass valve, the first compression cavity and the second compression cavity are communicated with the air exhaust hole, the first compression cavity and the second compression cavity are communicated with the air inlet, the bypass hole is communicated with the first compression cavity, and the heat exchange assembly is communicated with the air inlet and the air exhaust hole;

The plurality of working modes comprise a first working mode, a second working mode and a third working mode, and in the first working mode, a first compression cavity and a second compression cavity of the compressor work; in the second operating mode, the first compression chamber of the compressor operates; in the third operating mode, the first compression chamber of the compressor operates and the bypass valve is opened;

the compressor comprises a sliding vane, and one end of the sliding vane extends into the second compression cavity;

the control valve assembly comprises a bypass control valve and a single-double cylinder switching valve, and the bypass control valve is used for controlling the on-off of the air inlet, the air outlet and the bypass hole; the single-double cylinder switching valve is used for controlling the on-off of the air inlet, the air outlet and one end of the sliding sheet, which is far away from the second compression cavity;

in the first working mode, the bypass control valve is communicated with the bypass hole and the exhaust hole, and the single-double cylinder control valve is communicated with one end of the sliding sheet, which is away from the second compression cavity, and the exhaust hole;

in the second working mode, the bypass control valve is communicated with the bypass hole and the exhaust hole, and the single-double cylinder control valve is communicated with one end of the sliding vane, which is away from the second compression cavity, and the air inlet hole;

In the third working mode, the bypass control valve is communicated with the bypass hole and the air inlet hole, and the single-double cylinder control valve is communicated with one end of the sliding vane, which is away from the second compression cavity, and the air inlet hole.

2. The heat pump clothes dryer of claim 1 wherein the bypass control valve has a first high pressure port, a first low pressure port and a bypass port in communication with each other, the first high pressure port being in communication with the exhaust port, the first low pressure port being in communication with the intake port, the bypass port being in communication with the bypass port; the single-double cylinder switching valve is provided with a second high-pressure port, a second low-pressure port and a communication port which are communicated with each other, the second high-pressure port is communicated with the exhaust hole, the second low-pressure port is communicated with the air inlet hole, and the communication port is communicated with one end of the sliding vane, which is far away from the second compression cavity;

in the first working mode, a first high-pressure port and a bypass port of the bypass control valve are opened, a first low-pressure port is closed, a second high-pressure port and a communication port of the single-double cylinder switching valve are opened, and a second low-pressure port is closed;

in the second working mode, a first high-pressure port and a bypass port of the bypass control valve are opened, a first low-pressure port is closed, a second high-pressure port of the single-double cylinder switching valve is closed, and a second low-pressure port and a communication port are opened;

In the third working mode, the first high-pressure port of the bypass control valve is closed, the first low-pressure port and the bypass port are opened, the second high-pressure port of the single-double cylinder switching valve is closed, and the second low-pressure port and the communication port are opened.

3. The heat pump clothes dryer of any one of claims 1 or 2 further comprising a humidity detector connected to the controller, the humidity detector being disposed within the dryer drum, the humidity detector being for detecting a humidity value of the laundry within the dryer drum.

4. A control method of a heat pump clothes dryer, for the heat pump clothes dryer, characterized in that the heat pump clothes dryer comprises a compressor and a control valve assembly, wherein the compressor has a plurality of working modes with different displacement, and the control valve assembly is used for controlling the compressor to switch between the plurality of working modes; the control method of the heat pump clothes dryer comprises the following steps:

acquiring an operation mode instruction; the method comprises the steps of,

controlling the control valve assembly to switch the compressor to a corresponding working mode according to the operation mode instruction so as to enable the compressor to output the displacement under the corresponding working mode;

The compressor is provided with a first compression cavity, a second compression cavity, an air inlet, an exhaust hole and a bypass hole, the bypass hole is provided with a bypass valve, the first compression cavity and the second compression cavity are communicated with the exhaust hole, the first compression cavity and the second compression cavity are communicated with the air inlet, the bypass hole is communicated with the first compression cavity, the compressor comprises a sliding vane, and one end of the sliding vane extends into the second compression cavity; the control valve assembly comprises a bypass control valve and a single-double cylinder switching valve, and the bypass control valve is used for communicating the air inlet hole, the air outlet hole and the bypass hole; the single-double cylinder switching valve is used for communicating an exhaust hole, an air inlet hole and one end of the sliding sheet, which is away from the second compression cavity;

the operation mode instruction comprises a first operation mode instruction, a second operation mode instruction and a third operation mode instruction; the step of controlling the control valve assembly to switch the compressor to the corresponding working mode according to the operation mode command so that the compressor outputs the displacement in the corresponding working mode comprises the following steps:

if the operation mode instruction is a first operation mode instruction, controlling the bypass control valve to communicate the bypass hole with the exhaust hole, and controlling the single-double cylinder control valve to communicate one end of the sliding vane, which is far away from the second compression cavity, with the exhaust hole;

If the operation mode instruction is a second operation mode instruction, controlling the bypass control valve to communicate the bypass hole with the exhaust hole, and controlling the single-double cylinder control valve to communicate one end of the sliding vane, which is away from the second compression cavity, with the air inlet hole;

and if the operation mode instruction is a third operation mode instruction, controlling the bypass control valve to be communicated with the bypass hole and the air inlet hole, and controlling the single-double cylinder control valve to be communicated with one end of the sliding vane, which is away from the second compression cavity, and the air inlet hole.

5. The control method according to claim 4, wherein the bypass control valve has a first high-pressure port, a first low-pressure port, and a bypass port that communicate with each other, the first high-pressure port communicating with the exhaust hole, the first low-pressure port communicating with the intake hole, the bypass port communicating with the bypass hole; the single-double cylinder switching valve is provided with a second high-pressure port, a second low-pressure port and a communication port which are communicated with each other, the second high-pressure port is communicated with the exhaust hole, the second low-pressure port is communicated with the air inlet hole, and the communication port is communicated with one end of the sliding vane, which is far away from the second compression cavity;

and if the operation mode instruction is a first operation mode instruction, controlling the bypass control valve to be communicated with the bypass hole and the exhaust hole, and controlling the single-double cylinder control valve to be communicated with one end of the sliding vane, which is far away from the second compression cavity, and the exhaust hole, wherein the step of controlling the single-double cylinder control valve to be communicated with the bypass hole and the exhaust hole comprises the following steps:

If the operation mode instruction is a first operation mode instruction, controlling a first high-pressure port and a bypass port of the bypass control valve to be opened, controlling a first low-pressure port to be closed, and controlling a second high-pressure port and a communication port of the single-double cylinder switching valve to be opened and controlling a second low-pressure port to be closed;

and if the operation mode instruction is a second operation mode instruction, controlling the bypass control valve to be communicated with the bypass hole and the exhaust hole, and controlling the single-double cylinder control valve to be communicated with one end of the sliding vane, which is away from the second compression cavity, and the air inlet hole, wherein the step of controlling the single-double cylinder control valve to be communicated with the sliding vane comprises the following steps:

if the operation mode instruction is the second operation mode instruction, controlling a first high-pressure port and a bypass port of the bypass control valve to be opened, closing a first low-pressure port, and controlling a second high-pressure port and a second low-pressure port of the single-double cylinder switching valve to be closed and a communication port to be opened;

and if the operation mode instruction is a third operation mode instruction, controlling the bypass control valve to communicate the bypass hole with the air inlet, and controlling the single-double cylinder control valve to communicate one end of the sliding vane, which is away from the second compression cavity, with the air inlet, wherein the step of controlling the single-double cylinder control valve to communicate the sliding vane with the air inlet comprises the following steps:

and if the operation mode instruction is the third operation mode instruction, controlling the first high-pressure port of the bypass control valve to be closed, controlling the first low-pressure port and the bypass port to be opened, and controlling the second high-pressure port of the single-double cylinder switching valve to be closed and controlling the second low-pressure port and the communication port to be opened.

6. The control method of any one of claims 4 or 5, wherein the heat pump clothes dryer further comprises a humidity detector; after the step of controlling the control valve assembly to switch the compressor to the corresponding working mode according to the operation mode command so that the compressor outputs the displacement in the corresponding working mode, the method further comprises:

and controlling a humidity detector to detect the humidity value of clothes in the clothes drying cylinder, judging whether the humidity value is smaller than a preset humidity value, and controlling the heat pump clothes dryer to stop when the humidity value is smaller than the preset humidity value.

7. A control device of a heat pump clothes dryer, characterized in that the control device comprises a memory, a processor and a heat pump clothes dryer control program stored in the memory and executable by the processor, wherein the processor implements the control method of the heat pump clothes dryer according to any one of claims 4-6 when executing the heat pump clothes dryer control program.