CN111676675A - Heat pump clothes dryer and control method thereof - Google Patents

Abstract

The invention belongs to the technical field of clothes dryers, and particularly relates to a heat pump clothes dryer and a control method thereof. The invention aims to solve the problems that the compressor is frequently started and stopped and the drying efficiency is influenced in the prior art. The heat pump clothes dryer comprises a roller, a heat pump system, a fan, a ventilation assembly, a temperature detection device and a control device, wherein the heat pump system comprises an air duct, a condenser and an evaporator, the fan is used for driving air to flow in the air duct and the roller, and the control device is used for controlling the ventilation assembly to introduce cold air outside the air duct into a part of the air duct connecting the evaporator and a hot and humid air outlet of the roller when the working temperature of the heat pump system detected by the temperature detection device is higher than a preset temperature. Through the arrangement, cold air is introduced into the air channel to be mixed with the hot and humid air, so that the temperature of the hot and humid air exchanging heat with the refrigerant in the evaporator pipeline is reduced, the exhaust temperature of the compressor is reduced, and the reduction of the drying efficiency caused by frequent starting and stopping of the compressor due to high load is avoided.

Description

Heat pump clothes dryer and control method thereof

Technical Field

The invention belongs to the technical field of clothes dryers, and particularly relates to a heat pump clothes dryer and a control method of the heat pump clothes dryer.

Background

A heat pump clothes dryer is a common household appliance for drying clothes.

The heat pump clothes dryer comprises a roller, a fan, an air duct and a heat pump system; the roller is communicated with the air duct, the heat pump system comprises a compressor, a condenser and an evaporator, and at least a fan, the condenser and the evaporator are arranged in the air duct. When the heat pump clothes dryer works, a refrigerant is subjected to gas-liquid two-phase change in a heat pump system to absorb or release heat, wherein the refrigerant is condensed at a condenser to release heat; the fan drives the air in the air duct to pass through the condenser, the air absorbs heat and is heated to become dry hot air, the dry hot air is sent into the roller, and moisture which takes away clothes is changed into damp hot air, so that the temperature of the clothes is increased and the moisture is reduced; the damp and hot air is discharged out of the roller and is sent to the evaporator for cooling and dehumidifying; the air after temperature reduction and dehumidification is heated up by the condenser in cycles, and clothes are dried.

However, in the later stage of drying, the humidity of the clothes to be dried is reduced, the heat required by the clothes to be dried is reduced, the temperature of the hot and humid air exhausted from the drum is correspondingly increased, and at the moment, the compressor is in a high-load working state due to overhigh exhaust temperature, so that the compressor is frequently started and stopped, and the drying efficiency is influenced.

Disclosure of Invention

In order to solve the above problems in the prior art, that is, to solve the problem in the prior art that the drying efficiency is affected due to frequent start and stop of the compressor, a first aspect of an embodiment of the present invention provides a heat pump clothes dryer, including: a drum having a dry hot air inlet and a wet hot air outlet; the heat pump system comprises an air duct, a condenser and an evaporator; the air duct comprises a first portion and a second portion; the wet hot air outlet is communicated with the air inlet of the evaporator through the first part, the air outlet of the evaporator is communicated with the air inlet of the condenser, and the air outlet of the condenser is communicated with the dry hot air inlet through the second part; the fan is used for driving air to flow in the air duct and the roller; a ventilation assembly disposed at the first portion; the temperature detection device is used for detecting the working temperature of the heat pump system; and the control device is used for controlling the air exchange assembly to introduce the cold air outside the air duct into the first part when the temperature detected by the temperature detection device is higher than a preset temperature.

The heat pump clothes dryer as described above, wherein the temperature detecting means includes first temperature detecting means for detecting a temperature of the air intake of the evaporator; the control device is used for controlling the air exchange assembly to introduce cold air outside the air duct into the first part when the temperature detected by the first temperature detection device is higher than a first preset temperature.

The heat pump dryer as above, wherein the temperature detecting means includes second temperature detecting means for detecting a temperature of the air outlet of the condenser; the control device is used for controlling the air exchange assembly to introduce cold air outside the air duct into the first part when the temperature detected by the second temperature detection device is higher than a second preset temperature.

The heat pump clothes dryer as described above, wherein the heat pump system further includes a compressor located between the evaporator and the condenser; the temperature detection device comprises a third temperature detection device for detecting the temperature of the air outlet of the compressor; the control device is used for controlling the air exchange assembly to introduce cold air outside the air duct into the first part when the temperature detected by the third temperature detection device is higher than a third preset temperature.

The heat pump clothes dryer as described above, wherein the control means is further configured to control the air exchange assembly to discharge some of the hot and humid air in the first portion out of the first portion when the temperature detected by the temperature detection means is greater than a preset temperature.

The heat pump clothes dryer as above, wherein a heating element is provided in the second portion of the air duct.

The heat pump clothes dryer as described above, wherein the control means is further configured to periodically control the drum to stop rotating, and the control means further controls the heating member to stop heating when the drum stops rotating.

A second aspect of an embodiment of the present invention provides a heat pump dryer control method, including: starting the heat pump clothes dryer; and according to the working temperature of the heat pump system, controlling the air exchange assembly to introduce cold air into a part of an air channel for connecting a wet hot air outlet of the evaporator and the roller.

The method for controlling a heat pump clothes dryer according to the above, wherein the controlling the ventilation assembly to introduce cold air into a portion of an air duct for connecting an evaporator and a hot and humid air outlet of the drum according to the operating temperature of the heat pump system, specifically comprises: when the temperature of the air inlet of the evaporator is higher than a first preset temperature, when the temperature of the air outlet of the condenser is higher than a second preset temperature or when the temperature of the air outlet of the compressor is higher than a third preset temperature; the control ventilation assembly introduces cool air into a portion of the duct for connecting the evaporator and the hot and humid air outlet of the drum.

The control method of the heat pump clothes dryer as described above, further comprising: when the roller stops rotating, the heating element is controlled to stop heating, and the heating element is arranged in a part of air channel connecting the air outlet of the condenser and the dry hot air inlet of the roller.

As can be understood by those skilled in the art, the heat pump clothes dryer according to the embodiment of the present invention includes a drum, a heat pump system, a fan, a ventilation assembly, a temperature detection device, and a control device, the drum has a dry hot air inlet and a wet hot air outlet, the heat pump system includes an air duct, a condenser, and an evaporator, the fan is configured to drive air to flow in the air duct and the drum, the ventilation assembly is disposed in a portion of the air duct connecting the evaporator and the wet hot air outlet of the drum, the temperature detection device is configured to detect an operating temperature of the heat pump system, and the control device is configured to control the ventilation assembly to introduce cold air outside the air duct into the portion of the air duct connecting the evaporator and the wet hot air outlet of the drum when a temperature detected by the temperature detection device. Through the arrangement, cold air is introduced into the air channel to be mixed with the hot and humid air, so that the temperature of the hot and humid air exchanging heat with the refrigerant in the evaporator pipeline is reduced, the exhaust temperature of the compressor is reduced, and the reduction of the drying efficiency caused by frequent starting and stopping of the compressor due to high load is avoided.

Drawings

A preferred embodiment of a heat pump dryer and a control method thereof according to an embodiment of the present invention will be described below with reference to the accompanying drawings. The attached drawings are as follows:

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

FIG. 2 is a schematic diagram of a part of the structure of a heat pump clothes dryer according to the present invention;

FIG. 3 is a schematic diagram of a part of the structure of a heat pump clothes dryer according to the present invention;

FIG. 4 is an enlarged view of a portion of the breather assembly of FIG. 1;

fig. 5 is a schematic view illustrating a driving structure of a ventilation assembly in a heat pump clothes dryer according to the present invention;

FIG. 6 is a schematic diagram of another heat pump clothes dryer provided in accordance with the present invention;

FIG. 7 is a first schematic flow chart of a heat pump clothes dryer control method according to the present invention;

FIG. 8 is a second flowchart of a method for controlling a heat pump dryer according to the present invention;

FIG. 9 is a third schematic flow chart of a heat pump clothes dryer control method according to the present invention;

fig. 10 is a fourth schematic flow chart of the heat pump clothes dryer control method provided by the invention.

In the drawings:

1: a box body;

2: a drum;

3: a fan;

4: a heat pump system; 41: a compressor; 42: a condenser; 43: an evaporator;

5: a ventilation assembly; 51: a body; 511: mounting a plate; 512: wall plates; 52: an air inlet;

53: a first cover plate; 531: a first rotating shaft; 54: a driver; 55: an air outlet; 56:

a second cover plate; 561: a second rotating shaft; 57: a third rotating shaft; 58: a first link; 59:

a second link;

6: a first drive motor;

7: a front support;

8: a heating member;

a1: a heat pump circuit; a2: a first portion; a21: a first stage; a22: a second stage;

a3: a second portion.

Detailed Description

First, it should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention. And can be adjusted as needed by those skilled in the art to suit particular applications.

Next, it should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "inside", "outside", and the like are based on the direction or positional relationship shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or member must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected" and "connected" should be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

A heat pump clothes dryer is a common household appliance for drying clothes.

The heat pump clothes dryer comprises a box body, a rotary drum and a drying and condensing system, wherein the rotary drum is rotatably arranged in the box body, and the drying and condensing system is installed between the box body and the rotary drum and is used for drying clothes in the rotary drum. Wherein, stoving condensing system includes fan, heat pump system and wind channel.

The heat pump system includes a compressor, a condenser, and an evaporator. The condenser and the evaporator both comprise a gas flow channel for gas to flow and a pipeline for refrigerant to flow, and the gas flow channel and the pipeline are arranged in a crossed manner, so that heat exchange between gas and the refrigerant can be realized. The air duct connects the drum, the fan, the condenser and the evaporator in series, thereby forming an air duct for hot air for drying laundry. The fan is used for keeping hot air to circularly flow between the air duct and the roller, the evaporator is used for cooling the damp and hot air entering the air duct from the roller so as to remove water vapor in the damp and hot air, and the condenser is used for heating the dry and cold air after the water vapor is removed from the evaporator and the temperature is reduced.

Specifically, after the heat pump clothes dryer is started, the fan drives air in the box body to circularly flow between the air duct and the roller. The wet and hot air entering the air duct from the air outlet of the roller enters the evaporator from the air inlet of the evaporator and exchanges heat with the refrigerant in the evaporator pipeline, the heat of the wet and hot air is exchanged with the refrigerant in the evaporator pipeline, so that the refrigerant is heated and gasified, the water vapor in the wet and hot air is condensed into water drops due to the temperature reduction and is separated from the air under the action of gravity, and the dry and cold air losing a large amount of water vapor is discharged from the air outlet of the evaporator and then enters the condenser from the air inlet of the condenser.

The refrigerant after being heated and gasified in the evaporator is changed into high-temperature high-pressure gas under the action of the compressor, then flows into the pipeline of the condenser and exchanges heat with dry cold air entering the condenser from the air inlet of the condenser, the dry cold air is changed into dry hot air after absorbing a large amount of heat of the high-temperature high-pressure gas-phase refrigerant, and the dry hot air is discharged from the air outlet of the condenser and then flows into the roller from the air inlet of the roller so as to dry clothes in the roller.

The hot and dry air changes the water in the wet clothes into hot and humid air after being vaporized, and then enters the air duct from the air outlet of the drum again, so that the next circulation is started. The refrigerant that loses heat in the condenser tubes then flows back into the evaporator tubes to begin the next cycle. Thus, the drying of the laundry can be finally realized.

However, in the later stage of drying, the humidity of the clothes is greatly reduced, and the temperature drop amplitude of the hot and dry air entering the drum from the drum air inlet is obviously reduced, so that the temperature of the hot and humid air exhausted from the drum air outlet is obviously increased, and after the hot and humid air exchanges heat with the refrigerant in the evaporator pipeline, the exhaust temperature of the compressor is too high, so that the compressor is stopped or the intermittent operation is caused, and the drying efficiency is influenced.

The following explains a preferred technical solution of the heat pump dryer and the control method thereof according to the embodiment of the present invention.

Fig. 1 is a schematic diagram of a heat pump clothes dryer provided by the present invention, fig. 2 is a schematic diagram of a partial structure of the heat pump clothes dryer provided by the present invention, and fig. 3 is a schematic diagram of a partial structure of the heat pump clothes dryer provided by the present invention. As shown in fig. 1 to 3, the heat pump clothes dryer includes a cabinet 1, a drum 2 rotatably disposed in the cabinet 1, and a fan 3 and a heat pump system 4 disposed between the cabinet 1 and the drum 2 and used for drying clothes in the drum 2, wherein the cabinet 1 protects the drum 2, the fan 3 and the heat pump system 4. Wherein, the barrel bottom of the roller 2 is provided with a dry hot air inlet (i.e. an air inlet of the roller 2, located at the right end of the roller 2 in fig. 1), and the barrel mouth of the roller 2 is provided with a wet hot air outlet (i.e. an air outlet of the roller 2, located at the left end of the roller 2 in fig. 1).

The heat pump system 4 includes a duct, a condenser 42, an evaporator 43, and a compressor 41. Each of the condenser 42 and the evaporator 43 includes a gas flow passage through which gas flows and a pipe through which refrigerant flows, and the gas flow passage and the pipe are arranged to intersect, so that heat exchange between the gas and the refrigerant can be performed. The air duct comprises a first part A2 and a second part A3, the outlet of the damp and hot air is communicated with the air inlet of the evaporator 43 through the first part A2, the air outlet of the evaporator 43 is communicated with the air inlet of the condenser 42, and the air outlet of the condenser 42 is communicated with the inlet of the dry and hot air through the second part A3. The compressor 41 is provided separately from the air duct, the compressor 41 is located between an air outlet of the evaporator 43 and an air inlet of the condenser 42, and the evaporator 43, the compressor 41 and the condenser 42 are connected in this order and constitute a heat pump circuit a1 for circulating the refrigerant.

The evaporator 43 is used for cooling the hot and humid air in the first part a2 to remove moisture in the hot and humid air, the condenser 42 is used for heating the cold and dry air after being removed moisture and cooled in the evaporator 43, and the compressor 41 is used for compressing the refrigerant, and is a power supply unit for circulating the refrigerant along the heat pump circuit a 1.

The fan 3 is communicated with the air duct, and the fan 3 is used for driving air to flow between the air duct and the roller 2. The fan 3 may include a motor and fan blades, the motor is in transmission connection with the fan blades, and the motor drives the fan blades to rotate so as to keep air flowing between the air duct and the drum 2.

Specifically, when the heat pump clothes dryer works, the drum 2 rotates in the box body 1, and clothes in the drum 2 turn over up and down in the drum 2 along with the rotation of the drum 2; the fan 3 drives the air in the box body 1 to flow in the air channel and the roller 2. The moist hot air entering the first part a2 from the moist hot air outlet enters the evaporator 43 from the air inlet of the evaporator 43 and exchanges heat with the refrigerant in the evaporator 43 tubes, the heat of the moist hot air is exchanged with the refrigerant in the evaporator 43 tubes, so that the refrigerant is heated and gasified, the moisture in the moist hot air is condensed into water drops due to the temperature reduction and is separated from the air under the action of gravity, and the dry cold air losing a large amount of moisture is discharged from the air outlet of the evaporator 43 and then enters the condenser 42 from the air inlet of the condenser 42.

The refrigerant after being heated and gasified in the evaporator 43 is changed into high-temperature and high-pressure gas by the compressor 41, and then flows into the pipeline of the condenser 42, and exchanges heat with the dry and cold air entering the condenser 42 from the air inlet of the condenser 42, the dry and cold air changes into dry and hot air after absorbing a large amount of heat of the high-temperature and high-pressure gas-phase refrigerant, and the dry and hot air flows into the second part a3 of the air duct from the air outlet of the condenser 42, and then flows into the drum 2 through the dry and hot air inlet, so as to dry the clothes in the drum 2.

The hot and dry air becomes hot and humid air after evaporating water in the wet laundry, and then enters the first section a2 from the hot and humid air outlet again, thereby starting the next cycle. The refrigerant that has lost heat in the tubes of the condenser 42 then flows back into the tubes of the evaporator 43 to begin the next cycle. Thus, the drying of the laundry can be finally realized.

Wherein, the heat pump system 4 can be arranged at any position of the periphery of the roller 2, and considering that the heat pump system 4 has heavy weight, the heat pump system 4 can be arranged at the bottom of the roller 2, thereby avoiding falling down due to the insecure support of the heat pump system 4. The evaporator 43, the condenser 42 and the fan 3 can be arranged at intervals along the axial direction of the roller 2, so that the increase of the total length of the air channel caused by the staggered arrangement of the evaporator 43, the condenser 42 and the fan 3 along the radial direction of the roller 2 is avoided, the wind resistance can be reduced, and the heat loss of hot air is reduced. Further, as shown in fig. 1 and 3, the first part a2 is formed on a front support 7 of the heat pump dryer, the front support 7 being for supporting a hot and humid air outlet of the drum 2. Thereby, the hot and humid air discharged from the hot and humid air outlet easily enters the first section a 2.

Fig. 4 is an enlarged view of a portion of the breather assembly of fig. 1. As shown in fig. 1 to 4, the heat pump dryer further includes a ventilation assembly 5, and the ventilation assembly 5 is disposed on the first portion a2 of the wind tunnel for reducing the temperature of the hot and humid air in the first portion a 2. Therefore, in the later stage of drying, the humidity of the clothes is greatly reduced, the heat exchanged between the hot and dry air entering the drum 2 and the clothes to be dried is reduced, the temperature of the hot and humid air discharged from the hot and humid air outlet is correspondingly increased, the temperature of the hot and humid air in the first part a2 is reduced by arranging the ventilation assembly 5, and the exhaust temperature of the compressor 41 is further reduced, so that the compressor 41 is prevented from being frequently started and stopped due to high load.

Optionally, the ventilation assembly 5 has an air inlet 52 capable of being opened and closed, the air inlet 52 is used for introducing cold air outside the air duct into the first part a2 of the air duct to reduce the temperature of the hot and humid air in the first part a 2; and/or, the ventilation assembly 5 is provided with an air outlet 55 which can be opened and closed, and the air outlet 55 discharges part of the hot and humid air in the first part A2 out of the first part A2 so as to reduce the temperature of the hot and humid air in the first part A2.

With such an arrangement, when the ventilation assembly 5 has the air inlet 52, cold air enters the first portion a2 through the air inlet 52 and is mixed with hot and humid air, so as to reduce the temperature of the hot and humid air exchanging heat with the refrigerant in the pipeline of the evaporator 43, thereby reducing the exhaust temperature of the compressor 41 and avoiding the reduction of the drying efficiency caused by frequent start and stop of the compressor 41 due to high load. Here, the cool air should be broadly understood, that is, the cool air may be understood as air outside the cabinet 1 or air between the cabinet 1 and the drum 2 as long as the temperature thereof is lower than the temperature of the hot and humid air discharged from the hot and humid air outlet of the drum 2.

When the ventilation assembly 5 has the air outlet 55, some damp and hot air in the first part a2 is discharged out of the first part a2 through the air outlet 55, so that the air volume of the damp and hot air entering the air inlet of the evaporator 43 is reduced, the exhaust temperature of the compressor 41 is further reduced, the compressor 41 is prevented from being stopped, and the drying efficiency is prevented from being influenced.

As shown in fig. 1 and 4, when the ventilation assembly 5 has both the air inlet hole 52 and the air outlet hole 55 that can be opened and closed, the air inlet hole 52 and the air outlet hole 55 are disposed at a distance along the length direction of the air duct. Thus, the air inlet hole 52 and the air outlet hole 55 have a certain distance therebetween, and a portion of the hot and humid air discharged through the air outlet hole 55 is prevented from flowing back from the air inlet hole 52 to the first portion a2 of the air duct.

Preferably, the intake hole 52 may be disposed at an end of the first portion a2 near the intake opening of the evaporator 43, that is, the intake hole 52 is disposed near the intake opening of the evaporator 43. Because the wind pressure of the first part A2 on the side where the fan 3 supplies air is negative, and the wind pressure of the first part A2 on the side where the fan 3 supplies air is positive, in short, the negative pressure on the side where the first part A2 is closer to the evaporator 43 is larger, and by arranging the air inlet 52 at the end close to the evaporator 43, the cold air can enter the first part A2 under the action of the negative pressure, so that the cold air has good fluidity and good heat dissipation effect.

Similarly, the air outlet hole 55 may be provided at an end of the first portion a2 near the outlet of the hot and humid air of the drum 2, that is, the air outlet hole 55 is provided away from the air inlet of the evaporator 43. Since the positive pressure is larger on the side of the first part a2 closer to the drum 2, the air outlet hole 55 is disposed at the end close to the hot and humid air outlet of the drum 2, so that the hot and humid air of the first part a2 is easily discharged, and the heat dissipation effect is good.

In an achievable manner, the air outlet aperture 55 is formed on the front support 7 of the heat pump dryer. Therefore, the first part A2 is formed on the front support 7, and the air outlet hole 55 formed on the front support 7 is directly communicated with the damp and hot air outlet, so that the position of the air outlet hole 55 can not be influenced by the air pressure, and the air outlet effect is good. The position of the air outlet 55 on the front support 7 is not limited in this embodiment, and may be located on the rear sidewall of the drum 2 of the front support 7, the front sidewall of the front support 7 facing away from the drum 2, or the connecting sidewall between the rear sidewall and the front sidewall of the drum 2, for example.

As shown in fig. 3, the first portion a2 may also be provided in segments, and specifically includes a first segment a21 and a second segment a22, the first segment a21 extends in a direction perpendicular to the axis of the drum 2, the second segment a22 extends in a direction parallel to the axis of the drum 2, and both the first segment a21 and the second segment a22 are disposed to be attached to the inner wall of the cabinet 1. This makes it possible to effectively utilize the space in the heat pump dryer casing 1. At this time, the gas outlet 55 may be formed at the first section a21, the second section a22, or the intersection of the first section a21 and the second section a 22.

In another realisable form, the ventilation assembly 5 comprises a body 51, the body 51 being mounted on the first portion a2 of the duct, and the outlet aperture 55 being provided in the body 51. Thus, by adjusting the mounting position of the body 51 to the first portion a2 of the air passage, the hot and humid air discharged from the air outlet hole 55 can be drawn out to an appropriate position. For example, the body 51 may be disposed near the front side wall of the cabinet 1 so as to guide hot and humid air out of the front side wall of the cabinet 1.

Of course, in the present invention, the air intake holes 52 may be provided on the body 51. Therefore, the air inlet hole 52 and the air outlet hole 55 can be integrally formed on the body 51, that is, the air inlet hole 52 and the air outlet hole 55 can be simultaneously processed and formed on the body 51, so that an additional opening on the box body 1 of the heat pump clothes dryer is avoided, and the processing technology can be simplified.

Wherein the body 51 comprises a mounting plate 511 mounted on the first part a2 and a wall plate 512 arranged on the mounting plate 511 towards the inner side of the first part a2, the wall plate 512 being used for receiving the hot and humid air discharged from the hot and humid air outlet of the drum 2; the inlet holes 52 and the outlet holes 55 are arranged side by side on the mounting plate 511, and the outlet holes 55 are located on the side of the inlet holes 52 adjacent to the wall plate 512. With this arrangement, the hot and humid air discharged from the hot and humid air outlet of the drum 2 can impact the wall plate 512, and part of the hot and humid air impacting the wall plate 512 can flow to the air outlet hole 55 along the wall plate 512 and be discharged, and part of the hot and humid air is guided to the air outlet hole 55 by the wall plate 512, thereby playing a role in guiding air.

The body 51 is further provided with a filter for filtering impurities in the hot and humid air, the filter is installed at one end of the body 51 facing the hot and humid air outlet of the drum 2, after the hot and humid air discharged from the hot and humid air outlet is filtered by the filter, a part of the filtered hot and humid air is discharged out of the first part a2 through the air outlet hole 55, and the other part of the filtered hot and humid air enters the evaporator 43. Therefore, the dry hot air changes the moisture of the wet clothes in the drum 2 into the wet hot air, the wet hot air lifts impurities such as lint on the partial clothes to enter the first part A2, and the air flow channel and the pipeline of the evaporator 43 caused by the impurities such as the lint entering the evaporator 43 are prevented from being blocked by the filter. Wherein the filter can be a filter screen or a thread scrap filter known to those skilled in the art.

Preferably, the body 51 is removably mounted to the first portion A2 of the air chute. Therefore, the body 51 can be conveniently detached from the air duct, and the body 51 can be conveniently maintained and replaced. Further, the filter can be detached from the body 51, so that the impurities filtered out of the filter can be cleaned conveniently, and the filter can work effectively. For example, the body 51 may be connected to the duct by snap-fitting or screw-fitting.

With continued reference to fig. 1 to 4, the ventilation assembly 5 further includes a first cover plate 53, a second cover plate 56, and a driver 54, the first cover plate 53 covers the air inlet hole 52, the second cover plate 56 covers the air outlet hole 55, and the driver 54 is used for controllably driving the first cover plate 53 to move to open and close the air inlet hole 52 and for controllably driving the second cover plate 56 to move to open and close the air outlet hole 55. Therefore, the heat pump clothes dryer is suitable for various scenes by controllably opening and closing the air inlet hole 52 and the air outlet hole 55. Illustratively, in the early stage of drying, the driver 54 drives the first cover plate 53 to close the air inlet 52 and drives the second cover plate 56 to close the air outlet 55, so as to avoid the temperature decrease of the hot and humid air entering the air inlet of the evaporator 43, and thus avoid the reduction of the drying efficiency; in the later stage of drying, the driver 54 drives the first cover plate 53 to open the air inlet 52 and drives the second cover plate 56 to open the air outlet 55, so as to reduce the exhaust temperature of the compressor 41, thereby avoiding frequent start and stop of the compressor 41 due to high load.

The first cover plate 53 may move in a translational manner or in a rotational manner, and the actuator 54 may be a motor, an air cylinder, an oil cylinder, or the like according to different movement manners of the first cover plate 53. For example, one side of the first cover plate 53 has a first rotating shaft 531 rotatably connected to the body 51, the driver 54 is a motor, a motor shaft is in transmission connection with the first rotating shaft 531, and the motor drives the first cover plate 53 to rotate around the first rotating shaft 531 so as to open or close the air inlet hole 52. Further, the actuator 54 is used to drive the first cover plate 53 to rotate toward the inside of the first part a 2. Due to the fact that the gap between the outer wall surface of the first part A2 and the box body 1 of the heat pump clothes dryer is small, the problem that the air inlet hole 52 cannot be completely opened due to interference between the first cover plate 53 and the box body 1 in the rotating process can be avoided. Further, the driver 54 may be disposed outside the first portion a2, so that it is possible to avoid the driver 54 occupying a portion of the wind tunnel, resulting in increased wind resistance.

The second cover 56 is similar to the first cover 53, and the second cover 56 can move in a translational or rotational manner. For example, one side of the second cover 56 has a second rotating shaft 561 rotatably connected to the body 51, and the driver 54 is connected to the second rotating shaft 561 and is used for driving the second cover 56 to rotate around the second rotating shaft 561 so as to open or close the air outlet 55.

Here, it should be noted that two independent drivers 54 may be provided to drive the first cover plate 53 and the second cover plate 56 to move, respectively. Thus, by separately controlling the two independent actuators 54, the first cover plate 53 and the second cover plate 56 can be separately driven to move, so that the air inlet hole 52 and the air outlet hole 55 can be opened and closed in various ways. Illustratively, the opening and closing of the inlet hole 52 and the outlet hole 55 are classified into the following: the air inlet hole 52 is opened, the air outlet hole 55 is closed, the air inlet hole 52 and the air outlet hole 55 are opened simultaneously, the air inlet hole 52 is closed, the air outlet hole 55 is opened, and the air inlet hole 52 and the air outlet hole 55 are closed simultaneously.

Alternatively, the first cover plate 53 and the second cover plate 56 may be controlled by the same driver 54. Therefore, when the number of the actuators 54 is one, the air inlet holes 52 and the air outlet holes 55 can be opened or closed at the same time, so that the two actuators 54 do not need to be controlled separately, and the operation is simple and convenient.

In order to enable the driver 54 to simultaneously drive the first cover plate 53 and the second cover plate 56 to move so as to simultaneously open the air inlet hole 52 and the air outlet hole 55, the ventilation assembly 5 further includes a link assembly connecting the first cover plate 53 and the second cover plate 56, and the driver 54 is connected to any one of the link assembly, the first rotating shaft 531 and the second rotating shaft 561.

In an alternative example of the present invention, the link assembly may include a connecting rod connecting the first and second rotating shafts 531 and 561, the connecting rod being connected to end surfaces of the first and second rotating shafts 531 and 561, and the connecting rod not intersecting axes of the first and second rotating shafts 531 and 561, that is, the first rotating shaft 531, the second rotating shaft 561, the connecting rod, and the first portion a2 may constitute a parallelogram link mechanism. Thereby, the simultaneous rotation of the first cover plate 53 and the second cover plate 56 can be achieved. When the first rotating shaft 531 is located at a side of the air inlet hole 52 away from the air outlet hole 55 and the second rotating shaft 561 is located at a side of the air outlet hole 55 away from the air inlet hole 52, the first cover plate 53 and the second cover plate 56 can rotate around opposite directions; when the first rotating shaft 531 is located at the middle of the first cover plate 53 and the second rotating shaft 561 is also located at the middle of the second cover plate 56, the first cover plate 53 and the second cover plate 56 can rotate in the same direction.

Fig. 5 is a schematic view of a driving structure of a ventilation assembly in a heat pump clothes dryer according to the present invention. In another alternative example of the present invention, as shown in fig. 4 and 5, the link assembly may include a third rotating shaft 57 connected to the body 51, and first and second links 58 and 59 connected to end surfaces of the third rotating shaft 57, the third rotating shaft 57 being located between the inlet hole 52 and the outlet hole 55; one end of the first connecting rod 58 departing from the third rotating shaft 57 is connected with the end surface of the first rotating shaft 531, and one end of the second connecting rod 59 departing from the third rotating shaft 57 is connected with the end surface of the second rotating shaft 561; the driver 54 is detachably connected to the third shaft 57 to drive the third shaft 57 to rotate, and further drive the first link 58 and the second link 59 to move, so as to simultaneously push the first shaft 531 and the second shaft 561 to rotate, and simultaneously open the air inlet 52 and the air outlet 55.

The third rotating shaft 57 is located between the first rotating shaft 531 and the second rotating shaft 561, and the third rotating shaft 57 may not be located in the same plane as the first rotating shaft 531 and the second rotating shaft 561. Preferably, the third rotating shaft 57 and the first and second rotating shafts 531 and 561 are located in the same plane. Therefore, the processing and the manufacturing are convenient, and the internal space of the heat pump clothes dryer is saved, so that more installation space is made for other components.

The first link 58 connects the first and third rotating shafts 531 and 57, and the second link 59 connects the second and third rotating shafts 561 and 57. In order to realize the simultaneous rotation of the first cover plate 53 and the second cover plate 56, the first link 58, the first rotating shaft 531, the third rotating shaft 57 and the first portion a2 constitute a first four-bar linkage, the second link 59, the second rotating shaft 561, the third rotating shaft 57 and the first portion a2 constitute a second four-bar linkage, one of the first four-bar linkage and the second four-bar linkage is a positive parallelogram link structure, and the other is an inverse parallelogram link structure, so as to realize the rotation of the first cover plate 53 and the second cover plate 56 around the opposite directions.

In order to realize the automatic opening and closing of the air inlet 52 and/or the air outlet 55, the heat pump clothes dryer further comprises a control device, the control device is connected with the ventilation assembly 5, and the control device is used for controlling the ventilation assembly 5 to open and close the air inlet 52 and/or open and close the air outlet 55. The Control device may be an ICU (Inner Control Unit), a PLC (Programmable Logic Controller), or a single chip microcomputer. Specifically, the control device is electrically connected to the driver 54, and the control device controls the driver 54 to open and close the air inlet 52 and/or the air outlet 55. When the first cover plate 53 and the second cover plate 56 are controlled by the two independent drivers 54, respectively, the control device controls the two drivers 54 to drive the first cover plate 53 to move to open and close the air inlet hole 52 and drive the second cover plate 56 to move to open and close the air outlet hole 55. When the first cover plate 53 and the second cover plate 56 are controlled by the same actuator 54 in a coordinated manner, the control device controls the one actuator 54 to drive the first cover plate 53 and the second cover plate 56 to move so as to open or close the air inlet hole 52 and the air outlet hole 55 simultaneously.

Alternatively, the heat pump dryer may include a timer for timing a rotation time of the drum 2, and the control means controls the air exchange assembly 5 to introduce the cool air outside the wind tunnel into the first section a2 and to discharge some of the hot and humid air in the first section a2 out of the first section a2 when the rotation time of the drum 2 counted by the timer reaches a set time. Therefore, when the working time of the heat pump clothes dryer reaches the set time and enters the drying later period, the temperature of the hot and humid air in the first part a2 is reduced through the control of the air exchange assembly 5, so as to reduce the exhaust temperature of the compressor 41. Wherein, the set time can be freely set by the technicians in the field according to the actual needs and the specific model of the heat pump clothes dryer. For example, after the drum 2 rotates for 30 minutes in an accumulated manner, when the heat pump clothes dryer enters the drying later stage, that is, the humidity of the clothes has been greatly reduced and the temperature of the hot and humid air discharged from the hot and humid air outlet is significantly increased, the set time may be set to 30 minutes.

Alternatively, the heat pump clothes dryer may further include a temperature detecting device electrically connected to the control device, the temperature detecting device being configured to detect an operating temperature of the heat pump system 4, the control device being configured to control the air exchange assembly 5 to introduce cool air outside the air duct into the first portion a2 when the temperature detected by the temperature detecting device is greater than a preset temperature, and control the air exchange assembly 5 to discharge some of the hot and humid air in the first portion a2 out of the first portion a 2. Therefore, when the working temperature of the heat pump system 4 is higher than the preset temperature, the temperature of the hot and humid air in the first part a2 is reduced by controlling the ventilation assembly 5, and then the exhaust temperature of the compressor 41 is reduced, so that the problem that the drying efficiency is low due to frequent start and stop of the compressor 41 is avoided. Moreover, compared to the previous implementation, this configuration can control the ventilation assembly 5 to lower the temperature of the hot and humid air in the first portion a2 more precisely when the operating temperature of the heat pump system 4 is higher, resulting in a high load operation of the compressor 41. Wherein, the temperature detection device can be a temperature sensor or an infrared thermocouple meter.

Wherein, the temperature detection device can be used for detecting the temperature of the air duct. Therefore, the working condition of the compressor 41 can be roughly judged by knowing the temperature of the air in the air duct, when the temperature of the air in the air duct is higher, the compressor 41 is possibly in a high-load state, the temperature of the air in the air duct is reduced through the ventilation assembly 5, and the compressor 41 is prevented from being stopped.

The temperature detecting means may include first temperature detecting means for detecting a temperature of the air inlet of the evaporator 43, and the control means is configured to control the air exchange assembly 5 to introduce cold air outside the air duct into the first portion a2 and to discharge some of the hot and humid air in the first portion a2 of the air duct out of the first portion a2 when the temperature detected by the first temperature detecting means is greater than a first preset temperature. Thus, the temperature of the hot and humid air entering the evaporator 43 can be automatically monitored by the first temperature detection means, and the exhaust temperature of the compressor 41 can be found to be increased as early as possible, and a countermeasure can be taken to avoid the compressor 41 from being stopped. The first preset temperature is not limited in this embodiment, and can be freely set by a person skilled in the art according to actual needs and a specific model of the heat pump clothes dryer. Preferably, the first preset temperature is between 70 and 80 ℃.

Similarly, the temperature detecting device may further include a second temperature detecting device for detecting the temperature of the air outlet of the condenser 42, and the control device is configured to control the air exchanging assembly 5 to introduce the cool air outside the air duct into the first portion a2 and to discharge some of the hot and humid air in the first portion a2 of the air duct out of the first portion a2 when the temperature detected by the second temperature detecting device is greater than a second preset temperature. Therefore, the temperature of the hot and dry air discharged from the air outlet of the condenser 42 can be automatically monitored by the second temperature detecting device, and when the temperature of the hot and dry air is too high, the hot and dry air is subjected to heat exchange with wet clothes in the drum 2 to obtain hot and humid air with higher temperature, so that the exhaust temperature of the compressor 41 can be found to be increased as soon as possible, and a solution can be taken to avoid the shutdown of the compressor 41. The second preset temperature is higher than the first preset temperature, and can be set freely by a person skilled in the art according to actual needs and specific models of the heat pump clothes dryer. Preferably, the second predetermined temperature is between 90 ℃ and 100 ℃.

The present invention is not limited thereto, and the temperature detecting means may further include a third temperature detecting means for detecting a temperature of the air outlet of the compressor 41, and the control means is configured to control the air exchange assembly 5 to introduce cool air outside the air duct into the first portion a2 and to discharge some of the hot and humid air inside the first portion a2 of the air duct out of the first portion a2 when the temperature detected by the third temperature detecting means is greater than a third preset temperature. Therefore, the third temperature detection device can be used for automatically monitoring the exhaust temperature of the compressor 41, so that the exhaust temperature rise of the compressor 41 can be found as soon as possible, and a solution is taken to avoid the stop of the compressor 41. Moreover, the operating condition of the compressor 41 can be obtained more accurately than in the above two modes. The third preset temperature is not limited in this embodiment, and can be freely set by a person skilled in the art according to actual needs and a specific model of the heat pump clothes dryer. Preferably, the third preset temperature is between 60 ℃ and 70 ℃.

Of course, the above configuration is not limited, and the temperature detecting device may be disposed at other positions of the first section a2 for detecting the temperature of the hot and humid air in the first section a 2. For example, the temperature detecting means may be provided on the rear side wall of the drum 2 of the front support 7, the connecting side wall of the drum 2 for connecting the front side wall and the rear side wall.

In the above embodiment, the heat pump dryer further includes a first driving motor 6 disposed inside the cabinet 1, and the first driving motor 6 is connected to the drum 2 through a transmission to drive the drum 2 to rotate. Wherein, the transmission device can be a chain transmission, a belt transmission or a worm and gear transmission. For example, the transmission means includes a pulley in transmission connection with the first driving motor 6, and a belt wound around the pulley and the drum 2 so as to transmit the power of the first driving motor 6 to the drum 2. Of course, the first driving motor 6 may also be in transmission connection with the drum 2 through a clutch to drive the drum 2 to rotate.

For automated control of the heat pump dryer, the first driving motor 6 may be electrically connected to a control device that controls the drum 2 to rotate by the first driving motor 6. Further, the control means may be adapted to control the drum 2 to periodically rotate in the forward and reverse directions and stop the rotation for a preset time when the forward and reverse rotations of the drum 2 are switched. Therefore, in the process of drying clothes, the rotary drum 2 can rotate forwards and then rotate backwards to shake and disperse the clothes to be dried, so that the clothes to be dried are prevented from being knotted; moreover, stopping rotation provides a buffer for switching the drum 2 from the forward rotation state to the reverse rotation state to overcome the inertia of the movement. The forward rotation time, the stall time and the reverse rotation time of the roller 2 can be freely set by technicians according to actual needs, for example, the forward rotation time and the reverse rotation time are all between 1 and 3 minutes, and the stall time is between 3 and 5 seconds.

The first driving motor 6 may be a three-phase asynchronous motor to drive the drum 2 to rotate in the forward and reverse directions. From this, compare with setting up two motors and driving roller 2 corotation respectively and reversal, can avoid the motor to occupy in the box 1 too much space, for other parts of heat pump system 4 vacate more installation space, make heat pump system 4 can choose for use the great condenser 42 of size and evaporimeter 43, increase heat pump system 4's heat transfer ability, improve the stoving effect.

Optionally, the first driving motor 6 may also be connected with the fan 3 to drive the fan 3 to rotate at the same time. Therefore, the number of the motors can be reduced, and the occupied space of the motors in the box body 1 is reduced. Of course, the above configuration is not limited, and the heat pump dryer may be separately provided with a second driving motor connected to the fan 3 for separately driving the fan 3. From this, cylinder 2 and fan 3 adopt first driving motor 6 and second driving motor to drive respectively, and then can the independent control cylinder 2 and fan 3, avoid operating condition interact between them.

Preferably, the control device is also electrically connected with the second driving motor, and the control device is used for controlling the fan 3 to normally operate when the drum 2 stops rotating. Therefore, when the drum 2 stops rotating, the running state of the fan 3 is not influenced, and the reduction of the clothes drying speed caused by the stop of the fan 3 due to the stop of the drum 2 is avoided. In addition, the control device is also used for controlling the heat pump system 4 to normally operate when the drum 2 stops rotating. Therefore, the heat pump system 4 is prevented from being switched between the operation state and the stop operation state in the drying process, so that the heat pump system 4 is prevented from being preheated and heated again when being switched to the operation state, and the drying efficiency is prevented from being reduced.

Fig. 6 is a schematic diagram of another heat pump clothes dryer provided by the present invention. As shown in fig. 6, the heat pump dryer may further include a heating member 8, the heating member 8 being disposed between the air outlet of the condenser 42 and the dry hot air inlet of the drum 2, that is, within the second portion a3 of the wind tunnel. So set up, can carry out the secondary heating when the hot-dry air flow that is discharged from the gas outlet of condenser 42 is through heating member 8 for the hot-dry air temperature that flows into the inside of cylinder 2 risees once more, thereby accelerates drying speed, has improved drying efficiency.

It can be understood that this configuration is particularly suitable for the drying early stage, the initial stage of the operation of the heat pump system 4, and when the temperature rise speed of the hot and dry air is low, the temperature rise can be accelerated by using the heating element 8, so as to improve the drying efficiency and shorten the drying time. The heating element 8 may be an electric heating wire, a heat exchange tube in which a heat exchange medium flows, a PCT heating element, or other heating devices known to those skilled in the art. Further, the heating member 8 may be provided at the bottom of the drum 2 or inside the drum 2 as long as the temperature of the hot and dry air introduced into the inside of the drum 2 can be raised.

The heating element 8 may also be electrically connected to a control device, which is also used to periodically control the drum 2 to stop rotating, and to stop heating the heating element 8 when the drum 2 is stopped. Thereby, dry burning by continuous heating of the heating member 8 when the drum 2 is stopped is prevented, and the laundry staying in the drum 2 is prevented from being burned due to an excessively high temperature of the hot and dry air fed into the drum 2.

Fig. 7 is a first schematic flow chart of a heat pump clothes dryer control method provided by the invention. As shown in fig. 1 to 7, the present embodiment also provides a control method of a heat pump dryer, which includes the steps of:

starting the heat pump clothes dryer; controlling the air exchange assembly 5 to introduce cold air into a part of an air duct for connecting the evaporator 43 and a hot and humid air outlet of the drum 2 according to the working temperature of the heat pump system 4; and/or, the air exchange assembly 5 is controlled to exhaust some of the hot humid air in the first portion a2 out of the first portion a 2.

The control method of the heat pump clothes dryer provided by the embodiment controls the ventilation assembly 5 to introduce cold air into the first part a2 and/or discharge part of damp and hot air in the first part a2 according to the operating temperature of the heat pump system 4, so as to reduce the temperature of the damp and hot air entering the evaporator 43, and further reduce the exhaust temperature of the compressor 41, thereby avoiding frequent start and stop of the compressor 41 due to high-load operation.

Some possible control manners are briefly described below in connection with the structure of the heat pump dryer, but should not be construed as a specific limitation to the present control method of the heat pump dryer.

Fig. 8 is a second flow chart of the control method of the heat pump clothes dryer provided by the invention. Wherein, as shown in fig. 8, according to the working temperature of the heat pump system 4, the ventilation assembly 5 is controlled to introduce cold air into a part of the air duct for connecting the evaporator 43 and the hot and humid air outlet of the drum 2; and/or, the implementation manner of controlling the ventilation assembly 5 to discharge some of the hot and humid air in the first portion a2 out of the first portion a2 includes, but is not limited to, the following:

in one achievable manner, the temperature of the air inlet of the evaporator 43 is taken; judging whether the temperature of the air inlet of the evaporator 43 is higher than a first preset temperature; if yes, controlling the air exchange assembly 5 to introduce cold air into a part of the air channel for connecting the evaporator 43 and the hot and humid air outlet of the roller 2; and/or, the air exchange assembly 5 is controlled to exhaust some of the hot humid air in the first portion a2 out of the first portion a 2.

In another achievable manner, the temperature of the outlet of the condenser 42 is taken; judging whether the temperature of the air outlet of the condenser 42 is higher than a second preset temperature; if yes, controlling the air exchange assembly 5 to introduce cold air into a part of the air channel for connecting the evaporator 43 and the hot and humid air outlet of the roller 2; and/or, the air exchange assembly 5 is controlled to exhaust some of the hot humid air in the first portion a2 out of the first portion a 2.

In yet another way, the temperature of the outlet of the compressor 41 is obtained; judging whether the temperature of the air outlet of the compressor 41 is higher than a third preset temperature; if yes, controlling the air exchange assembly 5 to introduce cold air into a part of the air channel for connecting the evaporator 43 and the hot and humid air outlet of the roller 2; and/or, the air exchange assembly 5 is controlled to exhaust some of the hot humid air in the first portion a2 out of the first portion a 2.

Wherein, the arrangement of controlling the ventilation assembly 5 to introduce cold air into a part of the air channel for connecting the evaporator 43 and the hot and humid air outlet of the drum 2 specifically includes: the control driver 54 drives the first cover plate 53 to move to open the air inlet hole 52; controlling the air exchange assembly 5 to discharge some of the hot and humid air in the first portion a2 out of the first portion a2 is configured to specifically include: the control driver 54 drives the second cover plate 56 to move to open the air outlet hole 55.

When the first cover plate 53 and the second cover plate 56 are controlled by the two independent drivers 54, respectively, the two drivers 54 are controlled to open and close the air inlet hole 52 and/or the air outlet hole 55; when the first cover plate 53 and the second cover plate 56 are controlled by the same actuator 54 in a coordinated manner, the actuator 54 can open or close the air inlet hole 52 and the air outlet hole 55 at the same time.

In general, the process of starting the heat pump dryer may be divided into an energy saving mode and a fast drying mode, and when a user selects the energy saving mode or the fast drying mode, the heat pump dryer automatically performs a corresponding control method.

Fig. 9 is a third schematic flow chart of the heat pump clothes dryer control method provided by the invention. As shown in fig. 9, in the energy saving mode, starting the heat pump dryer specifically includes:

the drum 2 is controlled to rotate, the fan 3 is operated, the heat pump system 4 is operated, and the air exchange assembly 5 is controlled not to introduce cold air outside the air duct into the first portion a2 and not to discharge part of the hot and humid air in the first portion a2 out of the first portion a 2.

According to whether the roller 2 and the fan 3 are driven by the same motor or not, the rotation of the roller 2 and the operation of the fan 3 can be controlled according to the sequence or simultaneously. For example, when the drum 2 and the fan 3 are simultaneously driven by the first driving motor 6, the drum 2 is controlled to rotate while the fan 3 is controlled to operate. When the roller 2 and the fan 3 are driven by the first driving motor 6 and the second driving motor respectively, the roller 2 can be controlled to rotate first, and then the fan 3 is controlled to operate. Therefore, the drum 2 and the fan 3 can be prevented from being started at the same time, so that the circuit is prevented from being damaged due to the generation of excessive impact current at the starting moment.

Wherein, controlling the rotation of the drum 2 specifically comprises: the drum 2 is controlled to periodically rotate in the forward and reverse directions and stops rotating for a preset time when the forward and reverse rotations of the drum 2 are switched. It should be understood that when the drum 2 and the fan 3 are driven by the first driving motor 6 and the second driving motor, respectively, the fan 3 may maintain an operation state by the control of the second driving motor by the control means while the drum 2 stops rotating. Therefore, the fan 3 is prevented from stopping running under the influence of the roller 2, and the drying speed is reduced.

Preferably, after the drum 2 is controlled to rotate and the fan 3 is operated, the heat pump system 4 is controlled to work. Thereby, the heat pump system 4 is prevented from being started at the same time to prevent the circuit from being damaged due to excessive rush current generated at the moment of starting. It will be understood that the heat pump system 4 can be controlled by the control means to remain active when the drum 2 stops rotating. Therefore, the heat pump system 4 can be prevented from being preheated and heated again after being switched from the stop working state to the working state, and the drying time is long.

In the control method of the heat pump clothes dryer provided by the embodiment, in the early stage of drying, when the heat pump clothes dryer is started, only the drum 2, the fan 3 and the heat pump system 4 are operated to dry clothes, and the energy consumption of the heat pump clothes dryer is low.

Fig. 10 is a fourth schematic flow chart of the heat pump clothes dryer control method provided by the invention. As shown in fig. 10, in the fast drying mode, starting the heat pump dryer specifically includes:

controlling the drum 2 to rotate, the fan 3 to operate, the heat pump system 4 to work, and controlling the air exchange assembly 5 not to introduce cold air outside the air duct into the first part a2 and not to discharge part of the hot and humid air in the first part a2 out of the first part a 2; and a heating element 8 is controlled to heat, and the heating element 8 is arranged in a part of the air channel connecting the air outlet of the condenser 42 and the dry hot air inlet of the roller 2.

Through the above arrangement, since the temperature rise speed is slow in the earlier stage of drying, the heating is performed by controlling the heating member 8, and the air outlet of the condenser 42 and the hot dry air in a part of the air channel of the hot dry air inlet of the drum 2 are heated secondarily, so that the temperature of the hot dry air rises rapidly, the drying speed is increased, the drying time is shortened, and the rapid drying is realized. Here, it should be noted that the execution sequence and specific steps for controlling the rotation of the drum 2, the operation of the fan 3, and the operation of the heat pump system 4 are similar to the process for starting the heat pump clothes dryer in the energy saving mode, and are not described herein again.

Wherein, there is no restriction of the execution sequence between the heat pump system 4 and the heating element 8, that is, the heating element 8 can be preferentially controlled to heat, and then the heat pump system 4 is controlled to work; alternatively, the heat pump system 4 may be operated and the heating element 8 controlled to heat at the same time. The preferred example of the present embodiment is to control the operation of the heat pump system 4 preferentially and then control the heating element 8 to heat. Therefore, the heat pump system 4 and the heating element 8 are prevented from being started simultaneously, so that the circuit is prevented from being damaged due to the fact that overlarge impact current is generated in the starting moment, and the heating element 8 is prevented from being dried in the early stage of drying.

Further, the control method further includes: when the drum 2 stops rotating, the heating member 8 is controlled to stop heating. Thereby, dry burning by continuous heating of the heating member 8 when the drum 2 stops rotating is avoided, and the laundry staying in the drum 2 is prevented from being burned due to an excessively high temperature of the hot and dry air fed into the drum 2. Moreover, energy consumption is avoided.

In summary, the heat pump clothes dryer according to the embodiment of the present invention includes a drum 2, a heat pump system 4, a fan 3, an air exchange assembly 5, a temperature detection device, and a control device, where the drum 2 has a dry hot air inlet and a wet hot air outlet, the heat pump system 4 includes an air duct, a condenser 42, and an evaporator 43, the fan 3 is configured to drive air to flow in the air duct and the drum 2, the air exchange assembly 5 is disposed in a portion of the air duct connecting the evaporator 43 and the wet hot air outlet of the drum 2, the temperature detection device is configured to detect an operating temperature of the heat pump system, and the control device is configured to control the air exchange assembly 5 to introduce cold air outside the air duct into the portion of the air duct connecting the evaporator 43 and the wet hot air outlet of the drum 2 when a temperature detected by the temperature detection device is greater than a. Through the above arrangement, cold air enters the air channel and is mixed with hot and humid air, so that the temperature of the hot and humid air exchanging heat with the refrigerant in the evaporator 43 pipeline is reduced, the exhaust temperature of the compressor 41 is reduced, and the reduction of the drying efficiency caused by frequent starting and stopping of the compressor 41 due to high load is avoided.

So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims (10)

1. A heat pump clothes dryer, characterized by comprising:

a drum having a dry hot air inlet and a wet hot air outlet;

the heat pump system comprises an air duct, a condenser and an evaporator; the air duct comprises a first portion and a second portion; the wet hot air outlet is communicated with the air inlet of the evaporator through the first part, the air outlet of the evaporator is communicated with the air inlet of the condenser, and the air outlet of the condenser is communicated with the dry hot air inlet through the second part;

the fan is used for driving air to flow in the air duct and the roller;

a ventilation assembly disposed at the first portion;

the temperature detection device is used for detecting the working temperature of the heat pump system;

and the control device is used for controlling the air exchange assembly to introduce the cold air outside the air duct into the first part when the temperature detected by the temperature detection device is higher than a preset temperature.

2. The heat pump clothes dryer of claim 1 wherein the temperature detecting means includes first temperature detecting means for detecting a temperature of an air intake of the evaporator;

the control device is used for controlling the air exchange assembly to introduce cold air outside the air duct into the first part when the temperature detected by the first temperature detection device is higher than a first preset temperature.

3. The heat pump clothes dryer of claim 1 wherein the temperature detecting means includes second temperature detecting means for detecting a temperature of the air outlet of the condenser;

the control device is used for controlling the air exchange assembly to introduce cold air outside the air duct into the first part when the temperature detected by the second temperature detection device is higher than a second preset temperature.

4. The heat pump clothes dryer of claim 1 wherein the heat pump system further comprises a compressor located between the evaporator and the condenser; the temperature detection device comprises a third temperature detection device for detecting the temperature of the air outlet of the compressor;

the control device is used for controlling the air exchange assembly to introduce cold air outside the air duct into the first part when the temperature detected by the third temperature detection device is higher than a third preset temperature.

5. The heat pump clothes dryer of claim 1 wherein the control means is further configured to control the air exchange assembly to exhaust some of the hot and humid air in the first portion out of the first portion when the temperature detected by the temperature detecting means is greater than a preset temperature.

6. The heat pump clothes dryer according to any one of claims 1 to 5, wherein a heating element is provided in the second portion of the air duct.

7. The heat pump clothes dryer of claim 6 wherein the control means is further configured to periodically control the drum to stall, and wherein the control means further controls the heating element to stop heating while the drum is stalled.

8. A control method of a heat pump clothes dryer, characterized by comprising:

starting the heat pump clothes dryer;

and according to the working temperature of the heat pump system, controlling the air exchange assembly to introduce cold air into a part of an air channel for connecting a wet hot air outlet of the evaporator and the roller.

9. The method for controlling a heat pump clothes dryer according to claim 8, wherein the controlling the ventilation assembly to introduce cool air into a portion of an air duct for connecting an evaporator and a hot and humid air outlet of the drum according to the operating temperature of the heat pump system comprises:

when the temperature of the air inlet of the evaporator is higher than a first preset temperature, when the temperature of the air outlet of the condenser is higher than a second preset temperature or when the temperature of the air outlet of the compressor is higher than a third preset temperature;

the control ventilation assembly introduces cool air into a portion of the duct for connecting the evaporator and the hot and humid air outlet of the drum.

10. The control method of the heat pump dryer according to claim 8 or 9, further comprising:

when the roller stops rotating, the heating element is controlled to stop heating, and the heating element is arranged in a part of air channel connecting the air outlet of the condenser and the dry hot air inlet of the roller.

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