CN111676675B - Heat pump clothes dryer and control method thereof - Google Patents

Heat pump clothes dryer and control method thereof Download PDF

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Publication number
CN111676675B
CN111676675B CN202010431212.0A CN202010431212A CN111676675B CN 111676675 B CN111676675 B CN 111676675B CN 202010431212 A CN202010431212 A CN 202010431212A CN 111676675 B CN111676675 B CN 111676675B
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CN
China
Prior art keywords
air
heat pump
temperature
hot
air outlet
Prior art date
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Application number
CN202010431212.0A
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Chinese (zh)
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CN111676675A (en
Inventor
杨坤
邴进东
徐庆光
王冀海
米德龙
陶鲁光
孙吉臣
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hefei Haier Drum Washing Machine Co ltd
Haier Smart Home Co Ltd
Original Assignee
Hefei Haier Drum Washing Machine Co ltd
Haier Smart Home Co Ltd
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Application filed by Hefei Haier Drum Washing Machine Co ltd, Haier Smart Home Co Ltd filed Critical Hefei Haier Drum Washing Machine Co ltd
Priority to CN202010431212.0A priority Critical patent/CN111676675B/en
Publication of CN111676675A publication Critical patent/CN111676675A/en
Priority to PCT/CN2021/090851 priority patent/WO2021213530A1/en
Application granted granted Critical
Publication of CN111676675B publication Critical patent/CN111676675B/en
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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/02—Domestic laundry dryers having dryer drums rotating about a horizontal axis
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/206—Heat pump arrangements
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/32—Control of operations performed in domestic laundry dryers 
    • D06F58/34—Control of operations performed in domestic laundry dryers  characterised by the purpose or target of the control
    • D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F58/38—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of drying, e.g. to achieve the target humidity
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/28—Air properties
    • D06F2103/32—Temperature
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/50—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to heat pumps, e.g. pressure or flow rate
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/58—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to condensation, e.g. condensate water level
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/26—Heat pumps
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/30—Blowers
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/32—Air flow control means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)

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 problem that in the prior art, the compressor is frequently started and stopped, and the drying efficiency is affected. 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 channel, a condenser and an evaporator, the fan is used for driving air to flow in the air channel and the roller, and the control device is used for controlling the ventilation assembly to introduce cold air outside the air channel into a part of the air channel connected with 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 duct to be mixed with 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 drying efficiency caused by frequent start and stop 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 dryer is a commonly used household appliance for drying laundry.
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, and the heat pump system comprises a compressor, a condenser and an evaporator, and at least the fan, the condenser and the evaporator are arranged in the air duct. When the heat pump clothes dryer works, the refrigerant generates gas-liquid two-phase change in the heat pump system to absorb or release heat, wherein the refrigerant condenses and releases heat at the condenser; the fan drives air in the air duct to pass through the condenser, the air absorbs heat and rises temperature to become hot dry air, the hot dry air is sent into the roller, and moisture of clothes is taken away to become hot humid air, so that the temperature of the clothes rises and the moisture is reduced; the hot and humid air is discharged out of the roller and is sent to an evaporator for cooling and dehumidifying; the temperature of the cooled and dehumidified air is then increased through a condenser, and the clothes are dried repeatedly.
However, in the latter drying stage, the humidity of the laundry to be dried is lowered, the amount of heat required for the laundry to be dried is reduced, the temperature of hot and humid air discharged from the drum is correspondingly increased, and at this time, the compressor is in a high-load working state due to the excessively high exhaust temperature, so that the compressor is frequently started and stopped, thereby affecting the drying efficiency.
Disclosure of Invention
In order to solve the above-mentioned problems in the prior art, that is, in order to solve the problem that in the prior art, the compressor is frequently started and stopped and the drying efficiency is affected, a first aspect of an embodiment of the present invention provides a heat pump clothes dryer, which includes: the roller is provided with 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 part and a second part; the hot and humid 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 and hot air inlet through the second part; the fan is used for driving air to flow in the air duct and the roller; the ventilation assembly is arranged on the first part; a temperature detection device for detecting the working temperature of the heat pump system; and the control device is used for controlling the ventilation assembly to introduce cold air outside the air duct into the first part when the temperature detected by the temperature detection device is greater 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 an air inlet of the evaporator; and the control device is used for controlling the ventilation assembly to introduce cold air outside the air duct into the first part when the temperature detected by the first temperature detection device is greater than a first preset temperature.
The heat pump clothes dryer as described above, wherein the temperature detecting means includes second temperature detecting means for detecting a temperature of an air outlet of the condenser; and the control device is used for controlling the ventilation assembly to introduce cold air outside the air duct into the first part when the temperature detected by the second temperature detection device is greater than a second preset temperature.
A heat pump clothes dryer as described above, wherein the heat pump system further comprises a compressor, the compressor being located between the evaporator and the condenser; the temperature detection device comprises a third temperature detection device and is used for detecting the temperature of an air outlet of the compressor; and the control device is used for controlling the ventilation 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 ventilation 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 described 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, and the control means further controls the heating member to stop heating when the drum stops.
A second aspect of an embodiment of the present invention provides a heat pump clothes dryer control method, including: starting the heat pump clothes dryer; the ventilation assembly is controlled to introduce cool air into a portion of the air duct connecting the evaporator and the hot and humid air outlet of the drum according to an operating temperature of the heat pump system.
The control method of the heat pump clothes dryer, wherein the control ventilation assembly introduces cold air into a part of air duct of a hot and humid air outlet for connecting the evaporator and the roller according to the working temperature of the heat pump system, specifically comprises the following steps: when the temperature of the air inlet of the evaporator is greater than a first preset temperature, when the temperature of the air outlet of the condenser is greater than a second preset temperature or when the temperature of the air outlet of the compressor is greater than a third preset temperature; the control ventilation assembly introduces cool air into a portion of the air duct 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 piece is controlled to stop heating, and the heating piece is arranged in a part of air duct connecting the air outlet of the condenser and the dry hot air inlet of the roller.
It can be understood by those skilled in the art that the heat pump clothes dryer according to the embodiment of the invention comprises a roller, a heat pump system, a fan, a ventilation assembly, a temperature detection device and a control device, wherein the roller is provided with 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 fan is used for driving air to flow in the air duct and the roller, the ventilation assembly is arranged in a part of the air duct connecting the evaporator and the wet hot air outlet of the roller, 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 ventilation assembly to introduce cold air outside the air duct into a part of the air duct connecting the evaporator and the wet hot air outlet of the roller when the temperature detected by the temperature detection device is higher than a preset temperature. Through the arrangement, cold air is introduced into the air duct to be mixed with 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 drying efficiency caused by frequent start and stop of the compressor due to high load is avoided.
Drawings
Preferred implementations of the heat pump clothes dryer and the control method thereof according to the embodiments of the present invention are described below with reference to the accompanying drawings. The attached drawings are as follows:
FIG. 1 is a schematic diagram of a heat pump dryer according to the present invention;
fig. 2 is a schematic diagram of a part of a heat pump clothes dryer according to the present invention;
FIG. 3 is a schematic diagram of a part of a heat pump clothes dryer according to the second embodiment of the present invention;
FIG. 4 is an enlarged view of a portion of the ventilation assembly of FIG. 1;
FIG. 5 is a schematic diagram of 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 dryer provided by the present invention;
FIG. 7 is a schematic flow chart of a heat pump clothes dryer control method provided by the invention;
FIG. 8 is a second flow chart of the heat pump dryer control method provided by the invention;
FIG. 9 is a schematic flow chart III of a heat pump dryer control method provided by the invention;
fig. 10 is a flow chart diagram of a heat pump clothes dryer control method provided by the invention.
In the accompanying drawings:
1: a case;
2: a roller;
3: a blower;
4: a heat pump system; 41: a compressor; 42: a condenser; 43: an evaporator;
5: a ventilation assembly; 51: a body; 511: a mounting plate; 512: a wall plate; 52: an air inlet hole;
53: a first cover plate; 531: a first rotating shaft; 54: a driver; 55: an air outlet hole; 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 driving motor;
7: a front support;
8: a heating member;
a1: a heat pump circuit; a2: a first portion; a21: a first section; a22: a second section;
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. Those skilled in the art can adapt it as desired to suit a particular application.
Further, it should be noted that, in the description of the present invention, terms such as "inner", "outer", and the like, refer to directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or components must have a specific orientation, be constructed and operated in a specific orientation, 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 explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be the communication between the two components. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
A heat pump dryer is a commonly used household appliance for drying laundry.
The heat pump clothes dryer comprises a box body, a roller rotatably arranged in the box body, and a drying and condensing system which is arranged between the box body and the roller and is used for drying clothes in the roller. The drying and condensing system comprises a fan, a heat pump system and an air duct.
The heat pump system includes a compressor, a condenser, and an evaporator. The condenser and the evaporator both comprise gas channels for gas to flow and pipelines for refrigerant to flow, and the gas channels and the pipelines are arranged in a crossing way, so that heat exchange between the gas and the refrigerant can be realized. The air duct connects the drum, the blower, the condenser and the evaporator in series, thereby forming an air duct for hot air for drying laundry. Wherein the fan is used for keeping the circulation flow of hot air between the air duct and the roller, the evaporator is used for cooling the hot and humid air entering the air duct from the roller so as to remove water vapor in the hot and humid air, the condenser is used for heating the dry and cold air after removing water vapor and reducing temperature in the evaporator.
Specifically, after the heat pump clothes dryer is started, the fan drives air in the box body to circulate between the air duct and the roller. The hot and humid 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 hot and humid air is exchanged with the refrigerant in the evaporator pipeline, so that the refrigerant is heated and gasified, water vapor in the hot and humid air is condensed into water drops due to temperature reduction and is separated from the air under the action of gravity, and 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 heated and gasified in the evaporator becomes high-temperature high-pressure gas under the action of the compressor, then flows into a pipeline of the condenser, exchanges heat with dry and cold air entering the condenser from an air inlet of the condenser, and becomes dry and hot air after absorbing a large amount of heat of the high-temperature high-pressure gas-phase refrigerant to be discharged from an air outlet of the condenser, and then flows into the drum from an air inlet of the drum so as to dry clothes in the drum.
The dry and hot air turns into wet and hot air after vaporizing the water in the wet laundry, and then enters the air duct from the air outlet of the drum again, thereby starting the next cycle. The refrigerant losing heat in the condenser tubes flows back into the tubes of the evaporator to begin the next cycle. Thus, drying of laundry can be finally achieved.
However, in the later drying stage, the humidity of the laundry has been greatly reduced, and the temperature drop of the dry and hot air entering the drum from the drum air inlet is significantly reduced, so that the temperature of the wet and hot air discharged from the drum air outlet is significantly increased, and after heat exchange with the refrigerant in the evaporator pipeline, the exhaust temperature of the compressor is too high, which results in the condition that the compressor is stopped or intermittent operation occurs, thereby affecting the drying efficiency.
The following describes a preferred technical scheme of the heat pump clothes dryer and the control method thereof according to the embodiment of the invention.
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 a heat pump clothes dryer according to the present invention, and fig. 3 is a schematic diagram of a part of a heat pump clothes dryer according to the present invention. As shown in fig. 1 to 3, the heat pump clothes dryer includes a cabinet 1, a drum 2 rotatably provided in the cabinet 1, and a blower 3 and a heat pump system 4 provided between the cabinet 1 and the drum 2 for drying laundry in the drum 2, the cabinet 1 protecting the drum 2, the blower 3 and the heat pump system 4. Wherein, the bottom of the drum 2 is provided with a dry and hot air inlet (i.e. an air inlet of the drum 2, which is positioned at the right end of the drum 2 in fig. 1), and the mouth of the drum 2 is provided with a wet and hot air outlet (i.e. an air outlet of the drum 2, which is positioned at the left end of the drum 2 in fig. 1).
The heat pump system 4 includes an air duct, a condenser 42, an evaporator 43, and a compressor 41. The condenser 42 and the evaporator 43 each include a gas flow passage through which a gas flows and a pipe through which a refrigerant flows, and the gas flow passage and the pipe are disposed to intersect, so that heat exchange between the gas and the refrigerant can be achieved. The air duct comprises a first part A2 and a second part A3, a hot and humid air outlet is communicated with an air inlet of the evaporator 43 through the first part A2, an air outlet of the evaporator 43 is communicated with an air inlet of the condenser 42, and an air outlet of the condenser 42 is communicated with a hot and dry air inlet through the second part A3. The compressor 41 is provided independently of the air duct, the compressor 41 is located between the air outlet of the evaporator 43 and the air inlet of the condenser 42, and the evaporator 43, the compressor 41 and the condenser 42 are connected in sequence 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 portion A2 to remove water vapor in the hot and humid air, the condenser 42 is used for heating the dry and cold air after the water vapor is removed in the evaporator 43 and cooled, the compressor 41 is used for compressing refrigerant, and the refrigerant is a power supply unit for circulating the refrigerant along the heat pump circuit A1.
The fan 3 is communicated with the air duct, and the fan 3 is used for driving air to flow in the air duct and the roller 2. The fan 3 may include a motor and a fan blade, the motor is in transmission connection with the fan blade, and the motor drives the fan blade to rotate so as to keep air flowing between the air duct and the roller 2.
Specifically, when the heat pump clothes dryer works, the drum 2 rotates in the box 1, and clothes in the drum 2 turn up and down in the drum 2 along with the rotation of the drum 2; the fan 3 drives air in the box 1 to flow in the air duct and the roller 2. The hot and humid air entering the first portion A2 from the hot and humid air outlet enters the evaporator 43 from the air inlet of the evaporator 43 and exchanges heat with the refrigerant in the evaporator 43 pipe, the heat of the hot and humid air is exchanged to the refrigerant in the evaporator 43 pipe, so that the refrigerant is heated and gasified, the water vapor in the hot and humid air is condensed into water drops due to the temperature reduction and 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 43 and then enters the condenser 42 from the air inlet of the condenser 42.
The refrigerant 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 pipe 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, and becomes 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 portion 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 that laundry in the drum 2 is dried.
The dry hot air becomes wet hot air after vaporizing the water in the wet laundry, and then enters the first portion A2 again from the wet hot air outlet, thereby starting the next cycle. The refrigerant losing heat in the condenser 42 piping flows back into the evaporator 43 piping to begin the next cycle. Thus, drying of laundry can be finally achieved.
Wherein, the heat pump system 4 can set up in the optional position of cylinder 2 periphery, considers that the heat pump system 4 weight is big, and the heat pump system 4 can set up in the bottom of cylinder 2, avoids dropping because of heat pump system 4 supports insecurely. 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 duct 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, and the wind resistance and the heat loss of hot air can be reduced. Further, as shown in fig. 1 and 3, the first portion 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 is easily introduced into the first portion A2.
Fig. 4 is an enlarged view of a portion of the ventilation assembly of fig. 1. As shown in fig. 1 to 4, the heat pump clothes dryer further includes a ventilation assembly 5, and the ventilation assembly 5 is disposed on the first portion A2 of the air duct for reducing the temperature of the hot and humid air in the first portion A2. Accordingly, in the later drying stage, the humidity of the laundry has been greatly reduced, the heat exchanged between the dry hot air entering the drum 2 and the laundry to be dried is reduced, the temperature of the hot and humid air discharged from the hot and humid air outlet is correspondingly increased, and the temperature of the hot and humid air in the first portion A2 is reduced by providing the ventilation assembly 5, so that the exhaust temperature of the compressor 41 is reduced, thereby avoiding frequent start and stop of the compressor 41 due to high load.
Optionally, the ventilation assembly 5 has an air inlet 52 that can be opened and closed, and the air inlet 52 is used for introducing cold air outside the air duct into the first portion A2 of the air duct to reduce the temperature of the hot and humid air in the first portion A2; and/or, the ventilation assembly 5 is provided with an air outlet hole 55 which can be opened and closed, and the air outlet hole 55 discharges part of the damp and hot air in the first part A2 out of the first part A2 so as to reduce the temperature of the damp and hot air in the first part A2.
So configured, when the ventilation assembly 5 has the air intake hole 52, cold air enters the first portion A2 through the air intake hole 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 evaporator 43 pipeline, thereby reducing the exhaust temperature of the compressor 41, and avoiding the reduction of drying efficiency caused by frequent start-up and stop of the compressor 41 due to high load. Here, the cool air should be understood in a broad sense, that is, cool air should 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 that 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 of the hot and humid air in the first portion A2 is discharged out of the first portion A2 through the air outlet 55, so that the amount of the hot and humid air entering the air inlet of the evaporator 43 is reduced, and the exhaust temperature of the compressor 41 is further reduced, thereby avoiding the shutdown of the compressor 41 and avoiding the influence on the drying efficiency.
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 which 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. Therefore, a certain distance is reserved between the air inlet hole 52 and the air outlet hole 55, and a part of hot and humid air discharged through the air outlet hole 55 is prevented from flowing back to the first part A2 of the air channel from the air inlet hole 52.
Preferably, the air intake hole 52 may be provided at an end of the first portion A2 near the air intake port of the evaporator 43, that is, the air intake hole 52 is provided near the air intake port of the evaporator 43. Because the wind pressure of one side of the first part A2, which is positioned at the air inlet of the fan 3, is negative, and the wind pressure of one side of the first part A2, which is positioned at the air outlet of the fan 3, is positive, in short, the negative pressure of one side of the first part A2, which is closer to the evaporator 43, is larger, and the cold air conveniently enters the first part A2 under the action of the negative pressure by arranging the air inlet hole 52 at one end, which is closer to the evaporator 43, so that the fluidity is good and the heat dissipation effect is good.
Similarly, the air outlet 55 may be disposed at an end of the first portion A2 near the hot and humid air outlet of the drum 2, that is, the air outlet 55 is disposed away from the air inlet of the evaporator 43. Because the positive pressure is larger on the side of the first part A2, which is closer to the roller 2, the air outlet hole 55 is arranged at one end, which is closer to the damp and hot air outlet of the roller 2, so that part of damp and hot air of the first part A2 is conveniently discharged, and the heat dissipation effect is good.
In one possible way, the air outlet aperture 55 is formed on the front support 7 of the heat pump dryer. Therefore, since the first portion A2 is formed on the front support 7, the air outlet holes 55 formed on the front support 7 are directly communicated with the hot and humid air outlet, so that the positions of the air outlet holes 55 can be not affected by wind pressure, and the air outlet effect is good. The position of the air outlet holes 55 on the front support 7 is not limited in this embodiment, and may be, for example, on the rear side wall of the front support 7 on the drum 2, on the front side wall of the front support 7 facing away from the drum 2, or on the connecting side wall between the rear side wall and the front side wall of the drum 2.
As shown in fig. 3, the first portion A2 may further be arranged in sections, and specifically includes a first section a21 and a second section a22, where the first section a21 extends along a direction perpendicular to the axis of the drum 2, the second section a22 extends along a direction parallel to the axis of the drum 2, and both the first section a21 and the second section a22 are disposed adjacent to the inner wall of the case 1. Thereby, the space in the heat pump dryer cabinet 1 can be effectively utilized. At this time, the air outlet hole 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 implementation, the ventilation assembly 5 includes a body 51, the body 51 is mounted on the first portion A2 of the air duct, and the air outlet hole 55 is disposed on the body 51. Thus, by adjusting the mounting position of the body 51 in the first portion A2 of the duct, the hot and humid air discharged from the air outlet holes 55 can be led out to a proper position. For example, the body 51 may be disposed near the front side wall of the cabinet 1 so as to guide out the hot and humid air from the front side wall of the cabinet 1.
Of course, in the present invention, the air intake hole 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 formed on the body 51 at the same time, the 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 portion A2 and a wall plate 512 arranged on the inner side of the mounting plate 511 towards the first portion A2, the wall plate 512 is used for receiving the hot and humid air discharged from the hot and humid air outlet of the roller 2; the inlet aperture 52 and the outlet aperture 55 are disposed side by side on the mounting plate 511, with the outlet aperture 55 being located on a side of the inlet aperture 52 adjacent the wall plate 512. In this way, 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 55 along the wall plate 512 and be discharged, and part of the hot and humid air is guided to the air outlet 55 by the wall plate 512, thereby playing a role of guiding air.
The body 51 is further provided with a filter for filtering impurities in the hot and humid air, the filter is mounted 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 filtered hot and humid air is discharged from the first part A2 through the air outlet hole 55, and another part of filtered hot and humid air enters the evaporator 43. Thereby, the hot and dry air gasifies the water of the wet clothes in the drum 2 to become the hot and wet air, and the hot and wet air lifts up the sundries such as the batting on the part of the clothes to enter the first part A2, and by arranging the filter, the sundries such as the batting are prevented from entering the evaporator 43 to cause the blockage of the gas flow passage and the pipeline of the evaporator 43. The filter may be a filter mesh or a lint filter known to those skilled in the art.
Preferably, the body 51 is detachably mounted to the first portion A2 of the air duct. Therefore, the body 51 is convenient to detach from the air duct, and the body 51 is convenient to maintain and replace. Further, the filter can be detached from the body 51, so as to clean impurities filtered by the filter, thereby ensuring effective operation of the filter. For example, the body 51 may be connected to the air duct by a snap-fit or screw-fit connection.
With continued reference to fig. 1-4, the ventilation assembly 5 further includes a first cover plate 53, a second cover plate 56, and a driver 54, where 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. Thus, the heat pump clothes dryer is suitable for various scenes by controllably opening and closing the air inlet holes 52 and the air outlet holes 55. Illustratively, in the early drying stage, the driver 54 drives the first cover plate 53 to close the air inlet hole 52 and drives the second cover plate 56 to close the air outlet hole 55, so as to avoid the temperature reduction 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 drying stage, the driver 54 drives the first cover plate 53 to open the air inlet hole 52 and drives the second cover plate 56 to open the air outlet hole 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 movement form of the first cover plate 53 may be translational or rotational, and the driver 54 may be a motor, a cylinder, an oil cylinder, or the like according to different movement forms of the first cover plate 53. For example, one side of the first cover plate 53 has a first rotation shaft 531 rotatably connected to the body 51, the driver 54 is a motor, and a motor shaft is in driving connection with the first rotation shaft 531, and the motor drives the first cover plate 53 to rotate around the first rotation shaft 531 to open or close the air inlet hole 52. Further, the driver 54 is configured to drive the first cover 53 to rotate toward the inside of the first portion A2. Since the clearance between the outer wall surface of the first portion A2 and the cabinet 1 of the heat pump clothes dryer is small, the problem that the air inlet hole 52 cannot be completely opened due to interference with the cabinet 1 during rotation of the first cover plate 53 can be avoided. In addition, the driver 54 may be disposed outside the first portion A2, so that it is possible to avoid an increase in wind resistance caused by the driver 54 occupying a part of the wind channel.
The second cover plate 56 is similar to the first cover plate 53, and the movement of the second cover plate 56 may be translational or rotational. For example, one side of the second cover 56 has a second rotation shaft 561 rotatably connected to the body 51, and the driver 54 is connected to the second rotation shaft 561 for driving the second cover 56 to rotate around the second rotation shaft 561 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 controlling the two independent drivers 54, respectively, the first cover plate 53 and the second cover plate 56 can be driven to move independently, so that there are various opening and closing situations of the air inlet holes 52 and the air outlet holes 55. Illustratively, the opening and closing conditions of the inlet holes 52 and the outlet holes 55 are divided 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 simultaneously opened, 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 simultaneously closed.
Alternatively, the first cover plate 53 and the second cover plate 56 may be controlled in linkage by the same driver 54. Thus, when the number of the drivers 54 is one, the air inlet holes 52 and the air outlet holes 55 can be simultaneously opened or closed, so that the two drivers 54 do not need to be respectively controlled, 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 to simultaneously open the air inlet holes 52 and the air outlet holes 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 rotation shaft 531, and the second rotation shaft 561.
In an alternative example of the present invention, the link assembly may include a link lever connecting the first and second rotating shafts 531 and 561, the link lever being connected to end surfaces of the first and second rotating shafts 531 and 561, and the link lever not intersecting with axes of the first and second rotating shafts 531 and 561, that is, the first, second rotating shafts 531, 561, the link lever, and the first portion A2 may constitute a parallelogram link mechanism. Thereby, the first cover plate 53 and the second cover plate 56 can be simultaneously rotated. 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 rotation shaft 531 is located at the middle of the first cover plate 53 and the second rotation 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 may rotate around the same direction.
Fig. 5 is a schematic diagram 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 rotary shaft 57 connected to the body 51, and first and second links 58 and 59 connected to end surfaces of the third rotary shaft 57, the third rotary shaft 57 being located between the air inlet hole 52 and the air outlet hole 55; one end of the first connecting rod 58, which is away 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, which is away from the third rotating shaft 57, is connected with the end surface of the second rotating shaft 561; the driver 54 is detachably connected with the third rotating shaft 57 to drive the third rotating shaft 57 to rotate, and further drive the first connecting rod 58 and the second connecting rod 59 to move, so as to simultaneously push the first rotating shaft 531 and the second rotating shaft 561 to rotate, and simultaneously open the air inlet hole 52 and the air outlet hole 55.
The third rotation shaft 57 is located between the first rotation shaft 531 and the second rotation shaft 561, and the third rotation shaft 57 may not be located in the same plane with the first rotation shaft 531 and the second rotation shaft 561. Preferably, the third rotation shaft 57 and the first rotation shaft 531 and the second rotation shaft 561 are located in the same plane. Therefore, the heat pump clothes dryer is convenient to process and manufacture, and meanwhile, the internal space of the heat pump clothes dryer is saved, so that more installation space is reserved for other parts.
The first link 58 connects the first rotation shaft 531 and the third rotation shaft 57, and the second link 59 connects the second rotation shaft 561 and the third rotation shaft 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 rotation shaft 531, the third rotation shaft 57, and the first portion A2 constitute a first four-bar linkage, the second link 59, the second rotation shaft 561, the third rotation 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 anti-parallelogram link structure, so as to realize the rotation of the first cover plate 53 and the second cover plate 56 about opposite directions.
In order to automatically open and close the air inlet hole 52 and/or the air outlet hole 55, the heat pump clothes dryer further comprises a control device, wherein the control device is connected with the ventilation assembly 5 and used for controlling the ventilation assembly 5 to open and close the air inlet hole 52 and/or the air outlet hole 55. The control device may be an ICU (Inner Control Unit, an internal control unit), a PLC (Programmable Logic Controller, a programmable detection 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 hole 52 and/or the air outlet hole 55. When the first cover plate 53 and the second cover plate 56 are controlled by two independent drivers 54, the control device controls the two drivers 54 to drive the first cover plate 53 to move to open and close the air inlet holes 52, and drives the second cover plate 56 to move to open and close the air outlet holes 55. When the first cover plate 53 and the second cover plate 56 are controlled in linkage by the same driver 54, the control device controls the one driver 54 to drive the first cover plate 53 and the second cover plate 56 to move so as to simultaneously open or close the air inlet holes 52 and the air outlet holes 55.
Alternatively, the heat pump clothes dryer may include a timer for counting the rotation time of the drum 2, and the control means is for controlling the ventilation assembly 5 to introduce cool air outside the air duct into the first portion A2 and 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 when the rotation time of the drum 2 counted by the timer reaches a set time. Thus, when the heat pump dryer operating time reaches the set time and enters the drying later stage, the temperature of the humid hot air in the first portion A2 is lowered by controlling the air exchanging assembly 5 to lower the exhaust temperature of the compressor 41. The setting time can be freely set by a person skilled in the art according to actual needs and the specific model of the heat pump clothes dryer. For example, after the drum 2 is accumulatively rotated for 30 minutes, the heat pump clothes dryer enters the drying later stage, that is, the humidity of the laundry has been greatly reduced, and when 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, where the temperature detecting device is configured to detect an operating temperature of the heat pump system 4, and the control device is configured to control the ventilation assembly 5 to introduce cool air outside the air duct into the first portion A2 and control the ventilation assembly 5 to discharge some of the hot and humid air in the first portion A2 out of the first portion A2 when the temperature detected by the temperature detecting device is greater than a preset temperature. 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 portion A2 is reduced by controlling the air exchanging assembly 5, so as to reduce the exhaust temperature of the compressor 41, and avoid low drying efficiency caused by frequent start and stop of the compressor 41. Moreover, this configuration allows to control the ventilation assembly 5 to reduce the temperature of the humid hot air in the first portion A2 more precisely when the operation temperature of the heat pump system 4 is high, which results in a high load operation of the compressor 41, than in the previous implementation. Wherein, the temperature detection device can be a temperature sensor or an infrared thermocouple meter.
Wherein, temperature detection device can be used for detecting the temperature in wind channel. Therefore, by knowing the temperature of the air in the air duct, the working condition of the compressor 41 can be approximately judged, when the temperature of the air in the air duct is higher, the compressor 41 may be in a high-load state, and the temperature of the air in the air duct is reduced through the ventilation assembly 5, so that 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 for controlling the ventilation assembly 5 to introduce cool air outside the air duct into the first portion A2 and to discharge some of the humid hot air inside 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. Thereby, the temperature of the humid and hot air entering the evaporator 43 can be automatically monitored by the first temperature detecting means, and thus the rise in the exhaust temperature of the compressor 41 can be found early, and a countermeasure can be taken to avoid the stop of the compressor 41. The first preset temperature is not limited in this embodiment, and may be freely set by those 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, where the second temperature detecting device is configured to detect a temperature of the air outlet of the condenser 42, and the control device is configured to control the ventilation 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 second temperature detecting device is greater than a second preset temperature. Therefore, the temperature of the dry hot 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 dry hot air is too high, the dry hot air exchanges heat with wet clothes in the drum 2 to obtain wet hot air with higher temperature, so that the rise of the exhaust temperature of the compressor 41 can be found early, and a solving measure can be taken to avoid the shutdown of the compressor 41. The second preset temperature is larger than the first preset temperature, and the second preset temperature can be set freely by a person skilled in the art according to actual needs and the specific model of the heat pump clothes dryer. Preferably, the second preset temperature is between 90 ℃ and 100 ℃.
The present invention is not limited thereto, and the temperature detecting means may further include third temperature detecting means for detecting a temperature of the air outlet of the compressor 41, and the control means may be for controlling the ventilation assembly 5 to introduce cool air outside the air duct into the first portion A2 and to discharge some of the humid hot 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. Thus, the third temperature detecting device can be utilized to automatically monitor the exhaust temperature of the compressor 41, so that the rise of the exhaust temperature of the compressor 41 can be found early, and the solving measures can be taken to avoid the stop of the compressor 41. Moreover, the operation condition of the compressor 41 can be acquired more accurately than in the two modes. The third preset temperature is not limited in this embodiment, and may be freely set by those skilled in the art according to actual needs and a specific model of the heat pump dryer. Preferably, the third preset temperature is between 60 ℃ and 70 ℃.
Of course, the above arrangement is not limited thereto, and the temperature detecting means may be provided at other positions of the first portion A2 for detecting the temperature of the humid hot air in the first portion A2. For example, the temperature detecting means may be provided on the rear sidewall of the drum 2 on the front support 7, on the connection sidewall of the drum 2 for connecting the front sidewall and the rear sidewall.
In the above embodiment, the heat pump clothes dryer further includes a first driving motor 6 provided in the cabinet 1, and the first driving motor 6 is connected with the drum 2 through a transmission device to drive the drum 2 to rotate. The transmission device can be a chain transmission, a belt transmission or a worm and gear transmission. For example, the transmission means comprises a pulley in driving connection with the first drive motor 6 and a belt wound around the pulley and the drum 2, so as to transmit the power of the first drive motor 6 to the drum 2. Of course, the first driving motor 6 may also be in driving connection with the drum 2 through a clutch to drive the drum 2 to rotate.
For the automatic control of the heat pump dryer, the first drive motor 6 may be electrically connected to a control device, which controls the rotation of the drum 2 through the first drive motor 6. Further, the control means may be used to control the drum 2 to periodically rotate forward and reverse, and stop rotating for a preset time when the drum 2 is switched between forward and reverse. Therefore, in the process of drying clothes, the roller 2 can rotate forwards and then reversely so as to shake off the clothes to be dried, thereby avoiding knotting of the clothes to be dried; moreover, stopping the rotation provides a buffer for the drum 2 to switch from the normal rotation state to the reverse rotation state, so as to overcome the inertia of the movement. The forward rotation time, the stopping time and the reverse rotation time of the roller 2 can be freely set by a technician according to actual needs, for example, the forward rotation time and the reverse rotation time are both 1-3 minutes, and the stopping time is 3-5 seconds.
The first driving motor 6 may be a three-phase asynchronous motor to drive the drum 2 to perform forward rotation and reverse rotation. Therefore, compared with the arrangement of two motors for respectively driving the roller 2 to rotate forwards and reversely, the motor can be prevented from occupying excessive space in the box body 1, so that more installation space is reserved for other parts of the heat pump system 4, the heat pump system 4 can select the condenser 42 and the evaporator 43 with larger sizes, the heat exchange capacity of the heat pump system 4 is improved, and the drying effect is improved.
Alternatively, the first driving motor 6 may be further connected to the blower 3 to simultaneously drive the blower 3 to rotate. Thereby, the number of motors used can be reduced, so that the space occupied by the motors in the case 1 is reduced. Of course, the above configuration is not limited thereto, and the heat pump clothes dryer may be separately provided with a second driving motor connected to the blower 3 for separately driving the blower 3. Therefore, the roller 2 and the fan 3 are driven by the first driving motor 6 and the second driving motor respectively, and the roller 2 and the fan 3 can be controlled independently, so that the mutual influence of the running states of the roller 2 and the fan 3 is avoided.
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 roller 2 stops rotating, the running state of the fan 3 is not affected, and the phenomenon that the clothes drying speed is reduced due to the fact that the fan 3 stops rotating due to the fact that the roller 2 stops rotating 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. Thereby, the heat pump system 4 is prevented from being switched between the operation state and the stop operation state during the drying process, so that the heat pump system 4 is prevented from being preheated and heated again to cause a decrease in drying efficiency when being switched to the operation state.
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 clothes 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 air duct. So arranged, the dry hot air discharged from the air outlet of the condenser 42 can be secondarily heated while flowing through the heating member 8, so that the temperature of the dry hot air flowing into the drum 2 is increased again, thereby accelerating the drying speed and improving the drying efficiency.
It will be appreciated that this arrangement is particularly suitable for use in the early drying phase, when the rate of rise of the temperature of the hot dry air is low at the initial stage of operation of the heat pump system 4, the heating element 8 can be used to accelerate the rise of the temperature to increase the drying efficiency and shorten the drying time. The heating element 8 may be an electric heating wire, a heat exchange tube with a heat exchange medium flowing therein, a PCT heater, or other heating devices known to those skilled in the art. In addition, the heating member 8 may be provided at the tub bottom of the drum 2 or inside the drum 2 as long as the temperature of the dry hot air introduced into the inside of the drum 2 can be increased.
The heating element 8 may also be electrically connected to a control device, which is also adapted to periodically control the stopping of the drum 2, and which also controls the heating element 8 to stop heating when the drum 2 is stopped. Thereby, the heating member 8 is prevented from continuously heating to dry-burn when the drum 2 is stopped, and the laundry staying in the drum 2 is prevented from being burned due to the excessively high temperature of the dry hot air fed into the drum 2.
Fig. 7 is a schematic flow chart of a control method of a heat pump clothes dryer provided by the invention. As shown in fig. 1 to 7, the present embodiment also provides a control method of a heat pump clothes dryer, which includes the steps of:
starting the heat pump clothes dryer; controlling the ventilation assembly 5 to introduce cool air into a portion of the air duct connecting the evaporator 43 and the hot and humid air outlet of the drum 2 according to the operating temperature of the heat pump system 4; and/or the ventilation assembly 5 is controlled to expel some of the hot, humid air within the first portion A2 out of the first portion A2.
According to the control method of the heat pump clothes dryer provided by the embodiment, according to the working temperature of the heat pump system 4, the ventilation assembly 5 is controlled to introduce cold air into the first part A2 and/or discharge part of hot and humid air in the first part A2 so as to reduce the temperature of the hot and humid 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 working.
Some possible control modes are briefly described below in connection with the construction of the heat pump dryer, but these control modes should not be construed as specific limitations on the control method of the present heat pump dryer.
Fig. 8 is a second schematic 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 of controlling the ventilation assembly 5 to expel some of the hot, humid air within the first portion A2 out of the first portion A2 includes, but is not limited to, the following:
In one implementation, the temperature of the intake port of the evaporator 43 is obtained; judging whether the temperature of the air inlet of the evaporator 43 is greater than a first preset temperature; if yes, the ventilation assembly 5 is controlled to introduce cold air into a part of the air duct of the hot and humid air outlet for connecting the evaporator 43 and the drum 2; and/or the ventilation assembly 5 is controlled to expel some of the hot, humid air within the first portion A2 out of the first portion A2.
In another implementation, the temperature of the outlet of the condenser 42 is obtained; judging whether the temperature of the air outlet of the condenser 42 is greater than a second preset temperature; if yes, the ventilation assembly 5 is controlled to introduce cold air into a part of the air duct of the hot and humid air outlet for connecting the evaporator 43 and the drum 2; and/or the ventilation assembly 5 is controlled to expel some of the hot, humid air within the first portion A2 out of the first portion A2.
In yet another possible manner, the temperature of the air outlet of the compressor 41 is obtained; judging whether the temperature of the air outlet of the compressor 41 is greater than a third preset temperature; if yes, the ventilation assembly 5 is controlled to introduce cold air into a part of the air duct of the hot and humid air outlet for connecting the evaporator 43 and the drum 2; and/or the ventilation assembly 5 is controlled to expel some of the hot, humid air within the first portion A2 out of the first portion A2.
Wherein the control ventilation assembly 5 introduces cold air into a part of the air duct of the hot and humid air outlet for connecting the evaporator 43 and the drum 2 is provided to specifically include: the control driver 54 drives the first cover plate 53 to move to open the air intake hole 52; the control ventilation assembly 5 is configured to exhaust some of the hot and humid air within the first portion A2 out of the first portion A2 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 two independent drivers 54, the two drivers 54 are controlled to open and close the air inlet holes 52 and/or the air outlet holes 55, respectively; when the first cover plate 53 and the second cover plate 56 are controlled in linkage by the same driver 54, the driver 54 is controlled to open or close the air inlet holes 52 and the air outlet holes 55 at the same time.
Overall, a process of starting the heat pump clothes dryer may be divided into an energy saving mode and a quick drying mode, and when a user selects the energy saving mode or the quick drying mode, the heat pump clothes dryer automatically performs a corresponding control method.
Fig. 9 is a schematic flow chart III of a control method of the heat pump clothes dryer. As shown in fig. 9, in the energy saving mode, the starting of the heat pump clothes dryer specifically includes:
The roller 2 is controlled to rotate, the fan 3 is operated, the heat pump system 4 is operated, and the ventilation assembly 5 is controlled not to introduce cold air outside the air duct into the first part A2 and not to discharge part of hot and humid air in the first part A2 out of the first part A2.
The rotation of the drum 2 and the operation of the fan 3 can be controlled according to the sequence or simultaneously according to whether the drum 2 and the fan 3 are driven by the same motor. For example, when the drum 2 and the blower 3 are driven by the first driving motor 6 at the same time, the drum 2 is controlled to rotate and the blower 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 run. Thereby, it is possible to prevent the drum 2 and the fan 3 from being simultaneously started to prevent the circuit from being damaged due to excessive rush current generated at the moment of starting.
Wherein, control cylinder 2 rotates specifically to include: the drum 2 is controlled to periodically rotate forward and reverse, and the rotation is stopped for a preset time at the time of switching the forward rotation and the reverse rotation of the drum 2. 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 device when the drum 2 stops rotating. Thereby, the fan 3 is prevented from being stopped by the drum 2, resulting in a reduction in drying speed.
Preferably, after the drum 2 is controlled to rotate and the fan 3 is operated, the heat pump system 4 is controlled to operate. Thereby, the heat pump system 4 is prevented from being started simultaneously therewith to prevent the circuit from being damaged due to excessive rush current generated at the moment of starting. It will be appreciated that the heat pump system 4 may be controlled by the control means to remain active while the drum 2 is stopped. Thereby, it is possible to avoid the need to re-heat and heat the heat pump system 4 after the operation state is switched from the stopped state to the operation state, resulting in a long drying time.
In the control method of the heat pump clothes dryer provided by the embodiment, only the roller 2, the fan 3 and the heat pump system 4 are operated to dry clothes when the heat pump clothes dryer is started in the early drying stage, so that the energy consumption of the heat pump clothes dryer is low.
Fig. 10 is a flow chart diagram of a heat pump clothes dryer control method provided by the invention. As shown in fig. 10, in the quick drying mode, the start-up heat pump dryer specifically includes:
the roller 2 is controlled to rotate, the fan 3 is operated, the heat pump system 4 is operated, the ventilation assembly 5 is controlled not to introduce cold air outside the air duct into the first part A2, and part of hot and humid air in the first part A2 is not discharged out of the first part A2; the heating element 8 is controlled to heat, and the heating element 8 is arranged in a part of the air duct 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 rising speed in the early stage of drying is slow, the heating is performed by controlling the heating member 8, and the air outlet of the condenser 42 and the dry hot air in a part of the air channel of the dry hot air inlet of the drum 2 are subjected to secondary heating, so that the temperature of the dry hot air rises rapidly, the drying speed is improved, the drying time is shortened, and thereby the quick drying is realized. Here, it should be noted that the sequence and specific steps of 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 those of starting the heat pump dryer in the energy saving mode, and will not be described again.
The heat pump system 4 and the heating element 8 are not limited in execution sequence, namely the heating element 8 can be controlled to heat preferentially, 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. A preferred example of this embodiment is to control the operation of the heat pump system 4 preferentially and then control the heating member 8 to heat. Thereby, 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 excessive impact current generated at the moment of starting, 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, the heating member 8 is prevented from being continuously heated to dry-burn when the drum 2 stops rotating, and the laundry staying in the drum 2 is prevented from being burned due to the excessively high temperature of the dry hot air fed into the drum 2. Moreover, this avoids energy consumption.
In summary, the heat pump clothes dryer according to the embodiment of the invention includes a drum 2, a heat pump system 4, a fan 3, a ventilation 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 used to drive air to flow in the air duct and the drum 2, the ventilation assembly 5 is disposed in a part of the air duct connecting the evaporator 43 and the wet hot air outlet of the drum 2, the temperature detection device is used to detect an operating temperature of the heat pump system, and the control device is used to control the ventilation assembly 5 to introduce cool air outside the air duct into a part of the air duct connecting the evaporator 43 and the wet hot air outlet of the drum 2 when the temperature detected by the temperature detection device is greater than a preset temperature. Through the arrangement, cold air enters the air duct and is mixed with hot and humid air to reduce the temperature of the hot and humid air exchanging heat with the refrigerant in the evaporator 43 pipeline, thereby reducing the exhaust temperature of the compressor 41 and avoiding the reduction of drying efficiency caused by frequent start-up and stop of the compressor 41 due to high load.
Thus far, the technical solution of the present invention has 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 protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will fall within the scope of the present invention.

Claims (7)

1. A heat pump clothes dryer, comprising:
the roller is provided with 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 part and a second part; the hot and humid 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 and hot air inlet through the second part;
the fan is used for driving air to flow in the air duct and the roller;
the ventilation assembly is arranged on the first part;
a temperature detection device for detecting the working temperature of the heat pump system;
The control device is used for controlling the ventilation assembly to introduce cold air outside the air duct into the first part when the temperature detected by the temperature detection device is greater than a preset temperature;
the temperature detection device comprises a first temperature detection device for detecting the temperature of an air inlet of the evaporator;
the control device is used for controlling the ventilation assembly to introduce cold air outside the air duct into the first part when the temperature detected by the first temperature detection device is greater than a first preset temperature;
the temperature detection device comprises a second temperature detection device and is used for detecting the temperature of the air outlet of the condenser;
the control device is used for controlling the ventilation assembly to introduce cold air outside the air duct into the first part when the temperature detected by the second temperature detection device is greater than a second preset temperature;
the ventilation assembly includes: the air outlet hole, the air inlet hole and the body; the air inlet hole is arranged at one end of the first part close to the air inlet of the evaporator; the air outlet hole is arranged at one end close to the hot and humid air outlet of the roller; the body is arranged at the first part of the air duct, and the air inlet and the air outlet are both arranged on the body; the body comprises a mounting plate arranged on the first part and a wall plate arranged on the inner side of the mounting plate facing the first part; the air inlet hole and the air outlet hole are arranged on the mounting plate side by side, and the air outlet hole is positioned at one side of the air inlet hole, which is close to the wallboard; the air inlet hole and the air outlet hole are arranged at intervals along the length direction of the air channel;
The body is also provided with a filter for filtering sundries in the hot and humid air;
the ventilation assembly further comprises a first cover plate, a second cover plate and a driver, wherein the first cover plate is arranged at the air inlet hole, the second cover plate is arranged at the air outlet hole, and the driver is used for driving the first cover plate and the second cover plate to control the opening and closing of the air inlet hole and the air outlet hole;
the air exchanging assembly further comprises a connecting rod assembly connected with the first cover plate and the second cover plate, and the driver is connected with any one of the connecting rod assembly, the first rotating shaft and the second rotating shaft; the connecting rod assembly comprises a connecting rod for connecting the first rotating shaft and the second rotating shaft, the connecting rod is connected to the end faces of the first rotating shaft and the second rotating shaft, and the connecting rod is not intersected with the axes of the first rotating shaft and the second rotating shaft; the heat pump clothes dryer comprises a timer, wherein the timer is used for timing the rotation time of the drum; the control device is used for controlling the ventilation assembly to introduce cold air outside the air duct into the first part and controlling the ventilation assembly to discharge some damp and hot air in the first part out of the first part when the rotation time of the roller calculated by the timer reaches the set time.
2. The heat pump clothes dryer of claim 1 wherein the heat pump system further comprises a compressor, the compressor being located between the evaporator and the condenser; the temperature detection device comprises a third temperature detection device and is used for detecting the temperature of an air outlet of the compressor;
And the control device is used for controlling the ventilation 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.
3. The heat pump clothes dryer of claim 1 wherein the control means is further for controlling the ventilation assembly to expel some of the hot, humid air within the first portion from the first portion when the temperature detected by the temperature detection means is greater than a preset temperature.
4. A heat pump clothes dryer according to any one of claims 1 to 3 wherein a heating element is provided in the second portion of the air duct.
5. The heat pump clothes dryer of claim 4 wherein the control means is further for periodically controlling the drum to stop and, when the drum stops, the control means further controls the heating member to stop heating.
6. A control method of a heat pump clothes dryer, applied to the heat pump clothes dryer of claim 1, comprising:
starting the heat pump clothes dryer;
according to the working temperature of the heat pump system, controlling the ventilation assembly to introduce cold air into a part of air duct of a hot and humid air outlet for connecting the evaporator and the roller;
According to the operating temperature of the heat pump system, the control ventilation assembly introduces cold air into a part of air duct of a hot and humid air outlet for connecting the evaporator and the roller, and specifically comprises:
when the temperature of the air inlet of the evaporator is greater than a first preset temperature, when the temperature of the air outlet of the condenser is greater than a second preset temperature or when the temperature of the air outlet of the compressor is greater than a third preset temperature;
controlling the ventilation assembly to introduce cold air into a part of air duct of a hot and humid air outlet for connecting the evaporator and the roller;
when the rotation time of the roller calculated by the timer reaches the set time, cold air outside the air duct is introduced into the first part, and the ventilation assembly is controlled to discharge some of the hot and humid air in the first part out of the first part.
7. The control method of the heat pump clothes dryer of claim 6, further comprising:
when the roller stops rotating, the heating piece is controlled to stop heating, and the heating piece is arranged in a part of air duct connecting the air outlet of the condenser and the dry hot air inlet of the roller.
CN202010431212.0A 2020-05-20 2020-05-20 Heat pump clothes dryer and control method thereof Active CN111676675B (en)

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PCT/CN2021/090851 WO2021213530A1 (en) 2020-05-20 2021-04-29 Heat pump clothes dryer and control method for heat pump clothes dryer

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WO2021213530A1 (en) * 2020-05-20 2021-10-28 青岛海尔滚筒洗衣机有限公司 Heat pump clothes dryer and control method for heat pump clothes dryer
CN112981862B (en) * 2021-03-09 2022-11-22 海信冰箱有限公司 Clothes care equipment monitoring method and device, storage medium and clothes care equipment
WO2023083328A1 (en) * 2021-11-12 2023-05-19 广东美的白色家电技术创新中心有限公司 Clothes dryer
CN114790643A (en) * 2022-03-25 2022-07-26 鹤山市嘉基尚电器实业有限公司 Heat pump type drum clothes dryer

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