CN115523742B - Dehumidification control method and device of heat pump dryer and heat pump dryer - Google Patents

Dehumidification control method and device of heat pump dryer and heat pump dryer Download PDF

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Publication number
CN115523742B
CN115523742B CN202210950427.2A CN202210950427A CN115523742B CN 115523742 B CN115523742 B CN 115523742B CN 202210950427 A CN202210950427 A CN 202210950427A CN 115523742 B CN115523742 B CN 115523742B
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China
Prior art keywords
temperature difference
valve opening
valve
temperature
expansion valve
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CN115523742A (en
Inventor
刘帅
许文明
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Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Priority to CN202210950427.2A priority Critical patent/CN115523742B/en
Publication of CN115523742A publication Critical patent/CN115523742A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/08—Humidity
    • F26B21/086—Humidity by condensing the moisture in the drying medium, which may be recycled, e.g. using a heat pump cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
    • F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Gases (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The invention provides a dehumidification control method and device of a heat pump dryer and the heat pump dryer, and relates to the technical field of heat pump dryers, wherein the dehumidification control method of the heat pump dryer comprises the following steps: acquiring the coil temperature of a dehumidifier of the heat pump dryer, and calculating the temperature difference between the coil temperature and the target temperature; opening a first stop valve in response to the temperature difference being greater than a first temperature difference threshold, and adjusting a valve opening of the first expansion valve based on an initial designated valve opening of the first expansion valve based on the temperature difference to adjust a coil temperature, wherein the initial designated valve opening is determined based on the temperature difference; and repeating all the steps until the temperature difference is smaller than or equal to the first temperature difference threshold value, and closing the first stop valve. The technical scheme provided by the invention can realize the fine control of the dehumidification process of the heat pump dryer, improve the drying efficiency and reduce the energy consumption.

Description

Dehumidification control method and device of heat pump dryer and heat pump dryer
Technical Field
The present invention relates to the field of heat pump dryers, and in particular, to a method and an apparatus for controlling dehumidification of a heat pump dryer, and a heat pump dryer.
Background
The heat pump dryer is a heat lifting device, and can be applied to the drying and dehydration process of foods, medicinal materials, wood, agricultural and sideline products, industrial products and the like.
The heat pump dryer mainly utilizes condensation heat to heat and dehumidify objects, fig. 1 shows a schematic diagram of the working principle of a heat pump dryer system, the heat pump dryer system can comprise an evaporator (external machine), a heat pump compressor, a condenser (internal machine), an expansion valve, a controller and the like, during drying, a refrigerant continuously repeats the thermodynamic cycle process of evaporation, compression, condensation, throttling and re-evaporation in the system, and heat released in the thermodynamic cycle process can be continuously transferred to a drying area, so that continuous drying of materials required to be dried in the drying area in the drying chamber is realized. The dried object can discharge water vapor in the drying process, so that the drying chamber becomes wet, if the drying chamber cannot be dehumidified well, the dried object cannot be dried or is damped easily, and the drying quality and efficiency are affected. Therefore, how to better control the dehumidification process of the heat pump dryer has important significance in improving the drying efficiency, reducing the energy consumption and the like, and is a technical problem to be solved in the industry.
Disclosure of Invention
The invention provides a dehumidification control method and device of a heat pump dryer and the heat pump dryer, so as to control the dehumidification process of the heat pump dryer, improve the drying efficiency and reduce the energy consumption.
The invention provides a dehumidification control method of a heat pump dryer, comprising the following steps:
acquiring the coil temperature of a dehumidifier of the heat pump dryer, and calculating the temperature difference between the coil temperature and the target temperature;
opening a first shut-off valve in response to the temperature difference being greater than a first temperature difference threshold, and adjusting a valve opening of a first expansion valve based on an initial designated valve opening of the first expansion valve based on the temperature difference to adjust the coil temperature, the initial designated valve opening being determined based on the temperature difference;
repeating all the steps until the temperature difference is smaller than or equal to the first temperature difference threshold value, and closing the first stop valve;
the first stop valve is used for opening or closing a dehumidification thermodynamic loop of the heat pump dryer, and the compressor, the condenser, the first stop valve, the first expansion valve and the dehumidifier of the heat pump dryer are sequentially connected to form the dehumidification thermodynamic loop.
According to the dehumidification control method of the heat pump dryer provided by the invention, the valve opening of the first expansion valve is adjusted based on the initial designated valve opening of the first expansion valve based on the temperature difference, and the dehumidification control method comprises the following steps:
And under the condition that the temperature difference is larger than the first temperature difference threshold value and smaller than or equal to the second temperature difference threshold value, determining the initial designated valve opening as the minimum valve opening of the first expansion valve, and controlling the valve opening of the first expansion valve to be kept at the initial designated valve opening until the temperature difference is smaller than or equal to the first temperature difference threshold value.
The dehumidification control method of the heat pump dryer provided by the invention further comprises the following steps:
determining the initial specified valve opening based on the temperature difference and a current valve opening of the first expansion valve, if the temperature difference is greater than the second temperature difference threshold and less than or equal to a third temperature difference threshold;
controlling the valve opening of the first expansion valve to be the initial designated valve opening, and acquiring the temperature variation of the coil temperature once every first preset time to obtain a first coil temperature variation;
and adjusting the valve opening of the first expansion valve based on the first coil temperature variation until the temperature difference is less than or equal to the second temperature difference threshold.
According to the dehumidification control method of the heat pump dryer provided by the invention, the determining the initial designated valve opening based on the temperature difference and the current valve opening of the first expansion valve comprises the following steps:
Determining that the initial designated valve opening is a difference value between the current valve opening of the first expansion valve and a preset valve opening when the temperature difference is larger than a fourth temperature difference threshold and smaller than the third temperature difference threshold, wherein the fourth temperature difference threshold is larger than the second temperature difference threshold;
the adjusting the valve opening of the first expansion valve based on the first coil temperature variation amount includes:
reducing a valve opening of the first expansion valve by a first adjustment amplitude in response to the first coil temperature variation being greater than a first variation threshold;
and in response to the first coil temperature variation being less than or equal to a second variation threshold, increasing a valve opening of the first expansion valve by a second adjustment amplitude, the second variation threshold being less than the first variation threshold.
According to the dehumidification control method of the heat pump dryer provided by the invention, the determining the initial designated valve opening based on the temperature difference and the current valve opening of the first expansion valve comprises the following steps:
determining that the initial designated valve opening is the current valve opening of the first expansion valve under the condition that the temperature difference is larger than the second temperature difference threshold and smaller than or equal to a fourth temperature difference threshold, wherein the fourth temperature difference threshold is smaller than the third temperature difference threshold;
The adjusting the valve opening of the first expansion valve based on the first coil temperature variation amount includes:
reducing the valve opening of the first expansion valve by a third adjustment amplitude in response to the first coil temperature variation being greater than a third variation threshold;
and in response to the first coil temperature variation being less than or equal to a fourth variation threshold, increasing a valve opening of the first expansion valve by a fourth adjustment amplitude, the fourth variation threshold being less than or equal to the third variation threshold.
The dehumidification control method of the heat pump dryer provided by the invention further comprises the following steps:
opening a second stop valve and controlling the valve opening of the second expansion valve to be a preset valve opening under the condition that the temperature difference is larger than the first temperature difference threshold and smaller than the third temperature difference threshold;
the second stop valve is used for opening or closing a drying thermal loop of the heat pump dryer, and the evaporator, the compressor, the condenser, the second stop valve and the second expansion valve of the heat pump dryer are sequentially connected to form the drying thermal loop.
The dehumidification control method of the heat pump dryer provided by the invention further comprises the following steps:
Determining that the initial specified valve opening is the maximum valve opening of the first expansion valve when the temperature difference is greater than the third temperature difference threshold;
and adjusting the valve opening of the first expansion valve based on the temperature difference and the initial specified valve opening until the temperature difference is less than or equal to the third temperature difference threshold.
According to the dehumidification control method of the heat pump dryer provided by the invention, the adjusting the valve opening of the first expansion valve based on the temperature difference and the initial designated valve opening comprises the following steps:
controlling the valve opening of the first expansion valve to be the initial designated valve opening under the condition that the temperature difference is larger than the third temperature difference threshold and smaller than or equal to a fifth temperature difference threshold, and acquiring the temperature variation of the coil temperature once every second preset time to obtain a second coil temperature variation;
and adjusting the valve opening of the first expansion valve based on the second coil temperature variation until the temperature difference is less than the third temperature difference threshold.
According to the dehumidification control method of the heat pump dryer provided by the invention, the valve opening degree of the first expansion valve is adjusted based on the temperature variation of the second coil pipe, and the method comprises the following steps:
Reducing the valve opening of the first expansion valve by a fifth adjustment amplitude in response to the second coil temperature variation being greater than a fifth variation threshold;
and in response to the second coil temperature variation being less than or equal to a sixth variation threshold, increasing the valve opening of the first expansion valve by a sixth adjustment amplitude, the sixth variation threshold being less than the fifth variation threshold.
The dehumidification control method of the heat pump dryer provided by the invention further comprises the following steps:
and controlling the valve opening of the first expansion valve to be kept at the initial designated valve opening under the condition that the temperature difference is larger than the fifth temperature difference threshold.
The dehumidification control method of the heat pump dryer provided by the invention further comprises the following steps:
closing a second shut-off valve if the temperature difference is greater than the third temperature difference threshold;
the second stop valve is used for opening or closing a drying heating power loop of the heat pump dryer, and the evaporator, the compressor, the condenser, the second stop valve and the second expansion valve of the heat pump dryer are sequentially connected to form the drying heating power loop.
The invention also provides a dehumidification control device of the heat pump dryer, comprising:
The acquisition module is used for acquiring the coil temperature of the dehumidifier of the heat pump dryer and calculating the temperature difference between the coil temperature and the dehumidification target temperature;
the adjusting module is used for responding to the temperature difference to be larger than a first temperature difference threshold value, opening a first stop valve, adjusting the valve opening of a first expansion valve based on the initial designated valve opening of the first expansion valve to adjust the coil temperature, triggering the acquiring module to acquire the coil temperature of the dehumidifier again, and determining the initial designated valve opening based on the temperature difference;
a closing module for closing the first shut-off valve if the temperature difference is less than or equal to the first temperature difference threshold;
the first stop valve is used for opening or closing a dehumidification thermodynamic loop of the heat pump dryer, and the compressor, the condenser, the first stop valve, the first expansion valve and the dehumidifier of the heat pump dryer are sequentially connected to form the dehumidification thermodynamic loop.
The invention also provides a heat pump dryer which comprises an evaporator, a compressor, a condenser, a dehumidifier, a first stop valve, a first expansion valve, a first temperature sensor, a second temperature sensor, a humidity sensor and a controller;
The compressor, the condenser, the first stop valve, the first expansion valve and the dehumidifier are sequentially connected to form a dehumidification thermodynamic loop, and the first stop valve is used for opening or closing the dehumidification thermodynamic loop;
the first temperature sensor is arranged on a dehumidification coil of the dehumidifier and is used for collecting the coil temperature of the dehumidifier;
the second temperature sensor and the humidity sensor are arranged at the air return port of the heat pump dryer and are respectively and electrically connected with the controller, the second temperature sensor is used for collecting the air return port temperature, the humidity sensor is used for collecting the air return port humidity, and the air return port temperature and the air return port humidity are used for determining the target temperature;
the controller comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor realizes the dehumidification control method of the heat pump dryer when executing the computer program.
The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a dehumidification control method of a heat pump dryer as described in any one of the above.
The present invention also provides a computer program product comprising a computer program which when executed by a processor implements a method of controlling dehumidification of a heat pump dryer as described in any one of the above.
The dehumidification control method and device for the heat pump dryer and the heat pump dryer provided by the invention can control the opening and closing of the dehumidification thermodynamic loop by utilizing the magnitude relation between the temperature difference between the temperature of the coil pipe of the dehumidifier and the target temperature and the first temperature difference threshold, and adjust the valve opening of the first expansion valve in the dehumidification thermodynamic loop based on the temperature difference in the opening state of the dehumidification thermodynamic loop so as to adjust the temperature of the coil pipe, thereby realizing the real-time control of the dehumidification process of the heat pump dryer, and determining the currently-adapted valve opening according to the current temperature of the coil pipe of the dehumidifier so as to adjust the temperature of the coil pipe, so that the heat pump dryer works in a better dehumidification state, thereby improving the drying efficiency and reducing the energy consumption; in addition, in the dehumidification control process, the initial appointed valve opening of the first expansion valve can be determined according to the temperature difference, and then the valve opening based on the temperature difference is adjusted on the basis, so that the efficiency and the accuracy of valve opening adjustment are improved, the drying efficiency is further improved, and the energy consumption is reduced.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the principle of operation of a prior art heat pump dryer system;
fig. 2 is a schematic structural view of a heat pump dryer according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a dehumidification control method of a heat pump dryer according to an embodiment of the present invention;
fig. 4 is a schematic structural view of a dehumidification control device of a heat pump dryer according to an embodiment of the present invention;
fig. 5 is a schematic structural view of a controller in a heat pump dryer according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 2 schematically illustrates a structure of a heat pump dryer according to an embodiment of the present invention, and referring to fig. 2, the heat pump dryer may include an evaporator 201, a compressor 202, a condenser 203, a dehumidifier 204, a first shut-off valve 205, a first expansion valve 206, a second expansion valve 207, a first temperature sensor 208, a second temperature sensor 209, a humidity sensor 210, and a controller 212. Wherein the compressor 202, the condenser 203, the first stop valve 205, the first expansion valve 206, and the dehumidifier 204 are sequentially connected to form a dehumidification thermodynamic loop, and the first stop valve 205 may be used to open or close the dehumidification thermodynamic loop; the evaporator 201, the compressor 202, the condenser 203 and the second expansion valve 207 are connected in sequence to form a drying thermodynamic loop. Illustratively, a second shut-off valve 213 may also be connected between the condenser 203 and the second expansion valve 207, the second shut-off valve 213 may be used to open or close the drying thermodynamic loop.
The first temperature sensor 208 is disposed on the dehumidification coil of the dehumidifier 204 and is used for collecting the coil temperature of the dehumidifier 204.
The second temperature sensor 209 and the humidity sensor 210 are disposed at the air return port 20 of the heat pump dryer, and are respectively electrically connected to the controller 212, and are respectively used for collecting the air return port temperature and the air return port humidity at the air return port 20.
Illustratively, a throttling element 211 may be further connected between the first stop valve 205 and the first expansion valve 206, where the throttling element 211 may throttle and decompress the high-temperature and high-pressure refrigerant liquid into a low-temperature and low-pressure gas-liquid two-phase mixed refrigerant. The throttling element 211 may be, for example, a throttling capillary.
Illustratively, the first expansion valve 206 and the second expansion valve 207 may be electronic expansion valves, and the first shut-off valve 205 and the second shut-off valve 213 may be electronic shut-off valves.
The controller 212 is electrically connected to the evaporator 201, the compressor 202, the condenser 203, the dehumidifier 204, the first shut-off valve 205, the first expansion valve 206 and the second expansion valve 207, respectively, for controlling the operation of these devices. Based on the above, when the heat pump dryer heats, the refrigerant can continuously repeat the thermodynamic cycle process of evaporation, compression, condensation, throttling and re-evaporation, and at the same time, the heat released in the thermodynamic cycle process is continuously transferred into the drying chamber, so as to continuously heat and dehumidify the dried object in the drying chamber until the dried object is dried.
In an embodiment of the present invention, the controller 212 may be configured to: acquiring the coil temperature of the heat pump dryer dehumidifier 204, and calculating a temperature difference between the coil temperature and a target temperature, wherein the target temperature can be determined based on the return air inlet temperature and the return air inlet humidity; in response to the temperature difference being greater than the first temperature difference threshold, opening the first shut-off valve 205 and adjusting the valve opening of the first expansion valve 206 based on the initial specified valve opening of the first expansion valve 206 based on the temperature difference to adjust the coil temperature, the initial specified valve opening being determinable based on the temperature difference; all the foregoing steps are repeatedly performed until the temperature difference is less than or equal to the first temperature difference threshold value, and the first shut-off valve 205 is closed.
The dehumidification control method of the heat pump dryer of the present invention will be described with reference to fig. 3 based on the heat pump dryer of the corresponding embodiment of fig. 2.
Fig. 3 is a schematic flow chart illustrating a dehumidification control method of a heat pump dryer according to an embodiment of the present disclosure, and referring to fig. 3, the dehumidification control method of the heat pump dryer may include the following steps 310 to 330.
Step 310: the coil temperature of the heat pump dryer dehumidifier is obtained, and the temperature difference between the coil temperature and the target temperature is calculated.
Illustratively, as in the heat pump dryer shown in fig. 2, a first temperature sensor 208 is provided on the dehumidification coil of the dehumidifier 204, and the controller 212 may obtain the coil temperature of the dehumidifier 204 via the first temperature sensor 208.
The target temperature may be indicative of a critical temperature at which moisture in the air can be removed, and may be determined based on the dew point temperature, for example, a result of subtracting a preset temperature value from the dew point temperature Ta may be determined as a target temperature Tm, such as tm=ta-5. The dew point temperature refers to the temperature at which the air is cooled to saturation under the condition that the water vapor content in the air is unchanged and the air pressure is kept constant.
By way of example, the dew point temperature Ta may be calculated according to the following equation (1), which may be expressed as:
Wherein,tout represents the return air inlet temperature, RH represents the relative humidity, and can be determined based on the return air inlet humidity, rhout, where a and b are constants, e.g., a=17.27 ℃, b=237.7 ℃.
The dew point temperature Ta may also be calculated based on the return air inlet temperature Tout and the return air inlet humidity Rhout, for example. For example, the dew point temperature Ta may be calculated according to the formula ta=a×rhout+b×tout+c, where A, B and C are both constants, and may be determined according to empirical values, for example, a=0.2 may be taken, b=1, and C may be determined according to the return air inlet temperature Tout, for example, tout > 50 ℃ may take c= -30, and t is less than or equal to 50 ℃ may take c= -27.
The target temperature may also be set by the user, for example.
After the coil temperature and the target temperature are obtained, a temperature difference between the coil temperature and the target temperature may be calculated.
Step 320: and opening the first stop valve in response to the temperature difference being greater than the first temperature difference threshold, and adjusting the valve opening of the first expansion valve based on the initial designated valve opening of the first expansion valve based on the temperature difference to adjust the coil temperature.
The first temperature difference threshold may reflect the humidity of air in the heat pump dryer drying chamber to determine whether dehumidification by the dehumidifier is required. The lower the coil temperature, the more moisture in the air it can remove, and based on this, the coil temperature adjustable range can be reflected by the temperature difference between the coil temperature and the target temperature. If the temperature difference is greater than the first temperature difference threshold value, which indicates that the drying chamber air still needs to be dehumidified, and the coil temperature still has a reducible range, the first stop valve is kept in an open state, so that the dehumidifier in the dehumidification thermodynamic loop dehumidifies the drying chamber air, and the valve opening of the first expansion valve in the dehumidification thermodynamic loop is controlled based on the temperature difference between the coil temperature and the target temperature, so as to adjust the coil temperature, and the dehumidification force is adapted to the humidity of the air in the current drying chamber. Therefore, the heat pump dryer can exert a better dehumidification state, reduce energy consumption and improve drying efficiency.
The initial specified valve opening may be determined based on a temperature difference, for example, when the temperature difference is greater, indicating that the coil temperature needs to be reduced by a greater amount, at which time the valve opening of the first expansion valve may be opened to a maximum, i.e., the initial specified valve opening is determined to be the maximum valve opening of the first expansion valve, and then further refined on the basis thereof; for example, when the temperature difference is smaller, which indicates that the coil temperature is close to the target temperature, the valve opening of the first expansion valve can be finely adjusted to adjust the coil temperature, and then the current valve opening of the first expansion valve can be determined to be the initial designated valve opening, and the valve opening can be further finely adjusted on the basis. Therefore, the efficiency and the accuracy of valve opening adjustment can be improved, and the dehumidification efficiency is improved.
The expansion valve has an allowable valve opening range, for example, 80 to 360 degrees, and when the valve opening of the expansion valve is adjusted, the expansion valve needs to be adjusted within the allowable valve opening range. The valve opening range may also be configured by a user, for example.
Step 330: and repeatedly executing the steps until the temperature difference is smaller than or equal to the first temperature difference threshold value, and closing the first stop valve.
The dehumidification control process of steps 310-320 is repeatedly performed until the temperature difference between the coil temperature and the target temperature is less than or equal to the first temperature difference threshold, which indicates that the dehumidification purpose has been achieved, at which time the first shut-off valve may be closed to stop dehumidification. At this time, the drying chamber can be with the environment of better humidity to the stoving of being dried thing, has guaranteed stoving quality and efficiency.
In an exemplary embodiment, when the temperature difference between the coil temperature and the target temperature is less than or equal to the first temperature difference threshold, the second expansion valve 207 may be opened, and the drying thermodynamic loop operates, and the released heat is continuously transferred to the drying chamber, and the drying chamber may dry the object to be dried in a preferable humidity environment.
The dehumidification control method of the heat pump dryer provided by the invention can control the opening and closing of the dehumidification thermodynamic loop by utilizing the temperature difference between the temperature of the coil pipe of the dehumidifier and the target temperature and the magnitude relation between the temperature difference and the first temperature difference threshold, and adjust the valve opening of the first expansion valve in the dehumidification thermodynamic loop based on the temperature difference in the opening state of the dehumidification thermodynamic loop so as to adjust the temperature of the coil pipe, thereby realizing the real-time control of the dehumidification process of the heat pump dryer, determining the currently adapted valve opening according to the current temperature of the coil pipe of the dehumidifier so as to adjust the temperature of the coil pipe, and enabling the heat pump dryer to work in a better dehumidification state, thereby improving the drying efficiency and reducing the energy consumption; in addition, in the dehumidification control process, the initial appointed valve opening of the first expansion valve can be determined according to the temperature difference, and then the valve opening based on the temperature difference is adjusted on the basis, so that the efficiency and the accuracy of valve opening adjustment are improved, the drying efficiency is further improved, and the energy consumption is reduced.
Based on the dehumidification control method of the heat pump dryer according to the corresponding embodiment of fig. 3, the dehumidification control method of the heat pump dryer according to the embodiment of the present invention is further explained below by taking the example that the target temperature is Tm, the coil temperature is Tp, and the temperature difference between the coil temperature and the target temperature is (Tp-Tm).
In an example embodiment, the interval greater than the first temperature difference threshold may be further subdivided, and different dehumidification control logic is set for each subdivided temperature difference interval, so that the dehumidification process of the heat pump dryer is more refined, and the accuracy of dehumidification control is improved. Illustratively, adjusting the valve opening of the first expansion valve based on the initial specified valve opening of the first expansion valve based on the temperature difference may include: and under the condition that the temperature difference is larger than the first temperature difference threshold value and smaller than or equal to the second temperature difference threshold value, determining the initial designated valve opening as the minimum valve opening of the first expansion valve, and controlling the valve opening of the first expansion valve to be kept at the initial designated valve opening until the temperature difference is smaller than or equal to the first temperature difference threshold value. The first and second temperature difference thresholds may be negative.
For example, the first temperature difference threshold is-5, the second temperature difference threshold is-3, and if-5 < (Tp-Tm) is less than or equal to-3, which indicates that the humidity of the drying chamber is close to the target humidity requirement, the dehumidification purpose can be achieved by using smaller dehumidification force, and longer time is not spent, the valve opening of the first expansion valve can be kept at the minimum valve opening until (Tp-Tm) is less than or equal to-5. In the case of (Tp-Tm). Ltoreq.5, it is indicated that dehumidification is completed, and the first cut-off valve may be closed to stop dehumidification. At this time, the drying chamber can be used for drying the dried object in a better humidity environment, so that the drying quality and efficiency are ensured, and the energy consumption is reduced.
Illustratively, adjusting the valve opening of the first expansion valve based on the initial specified valve opening of the first expansion valve based on the temperature difference may further include: in the case where the temperature difference is greater than the second temperature difference threshold and less than or equal to the third temperature difference threshold, an initial specified valve opening may be determined based on the temperature difference and the current valve opening of the first expansion valve; then controlling the valve opening of the first expansion valve to be the initial designated valve opening, and acquiring the temperature variation of the temperature of the coil pipe once every first preset time to obtain the first coil pipe temperature variation; and adjusting the valve opening of the first expansion valve based on the first coil temperature variation until the temperature difference is less than or equal to the second temperature difference threshold.
When determining the initial designated valve opening based on the temperature difference and the current valve opening of the first expansion valve, the interval greater than the second temperature difference threshold and less than or equal to the third temperature difference threshold may be further divided, for example, into an interval greater than the second temperature difference threshold and less than the fourth temperature difference threshold and an interval greater than the fourth temperature difference threshold and less than or equal to the third temperature difference threshold, different initial designated valve openings may be determined for different temperature difference intervals where the temperature difference is located, and different dehumidification control logic may be adopted.
In an example embodiment, for a case where the temperature difference falls within a range greater than the second temperature difference threshold and less than or equal to the fourth temperature difference threshold, determining the initial specified valve opening based on the temperature difference and the current valve opening of the first expansion valve may include: and determining the initial designated valve opening as the current valve opening of the first expansion valve under the condition that the temperature difference is larger than the second temperature difference threshold and smaller than or equal to the fourth temperature difference threshold. Accordingly, adjusting the valve opening of the first expansion valve based on the first coil temperature variation amount may include: reducing the valve opening of the first expansion valve by a third adjustment amplitude in response to the first coil temperature variation being greater than a third variation threshold; and in response to the first coil temperature variation being less than or equal to a fourth variation threshold, increasing the valve opening of the first expansion valve by a fourth adjustment amplitude. The third adjustment amplitude and the fourth adjustment amplitude may be the same or different, and the present invention is not limited in particular. The fourth variation threshold is less than or equal to the third variation threshold.
It may be appreciated that, in the embodiment of the present invention, the values of the third adjustment amplitude, the fourth adjustment amplitude, the third variation threshold and the fourth variation threshold may be set according to actual needs. For example, if the third variation threshold value and the fourth variation threshold value are tx3 and tx4, respectively, tx 3=1 and tx 4=0 may be taken, or tx 3=tx 4=0 may be taken. For example, the third adjustment amplitude and the fourth adjustment amplitude may each take a value of 2.
Based on this, taking the example that the second temperature difference threshold value is-3 and the fourth temperature difference threshold value is 0, if the fact that-3 < (Tp-Tm) is less than or equal to 0 is determined at first, dehumidification control logic corresponding to the interval of-3 < (Tp-Tm) is entered. At this time Tp has already begun to approach Tm, the valve opening K of the first expansion valve can be set 1 The current value is used as an initial specified valve opening, and then valve opening adjustment based on the coil temperature variation is performed on the basis of the initial specified valve opening. For example, the first set period may be set as a period, for example, 20 seconds, and the temperature change amount Δt=t1-t 0 of the coil temperature Tp of the dehumidification coil may be determined once every period, where t1 is the coil temperature at the end of the 20 second period, and t0 is the coil temperature at the beginning of the 20 second period; assuming that tx 3=tx 4=0, the third adjustment amplitude and the fourth adjustment amplitude are both 2, then there are: if Deltat > 0, the valve opening of the first expansion valve at this time may be reduced to K 1 ＝K 1 -2; if Δt is less than or equal to 0, the valve opening of the first expansion valve at this time may be increased to K 1 ＝K 1 +2. Repeating execution of the valve opening K based on Δt 1 And (3) until (Tp-Tm) is less than or equal to-3, entering dehumidification control logic corresponding to the interval of less than or equal to-5 (Tp-Tm) which is less than or equal to-3, and continuing to perform dehumidification control.
In an example embodiment, for a case where the temperature difference falls within a temperature difference interval that is greater than the fourth temperature difference threshold and less than the third temperature difference threshold, determining the initial specified valve opening based on the temperature difference and the current valve opening of the first expansion valve may include: and under the condition that the temperature difference is larger than a fourth temperature difference threshold and smaller than a third temperature difference threshold, determining that the initial designated valve opening is the difference between the current valve opening of the first expansion valve and the preset valve opening, wherein the fourth temperature difference threshold is larger than the second temperature difference threshold. Accordingly, adjusting the valve opening of the first expansion valve based on the first coil temperature variation amount may include: in response to the first coil temperature variation being greater than a first variation threshold, reducing a valve opening of the first expansion valve by a first adjustment magnitude; and increasing the valve opening of the first expansion valve by a second adjustment amplitude in response to the first coil temperature variation being less than or equal to the second variation threshold. Wherein the first adjustment amplitude may be greater than the second adjustment amplitude. The first variable quantity threshold value is larger than the second variable quantity threshold value, so that the temperature variable quantity of the first coil pipe can be stabilized between the first variable quantity threshold value and the second variable quantity threshold value, the heat pump dryer is prevented from being out of control due to larger variable quantity, and the energy consumption can be reduced.
It may be appreciated that, in the embodiment of the present invention, the values of the first adjustment amplitude, the second adjustment amplitude, the first variation threshold value, and the second variation threshold value may be set according to actual needs. For example, the first variation threshold and the fourth variation threshold are tx1 and tx2, respectively, where tx 1=1 and tx 2=0 may be taken. For example, the first adjusting amplitude can be 5, and the second adjusting amplitude can be 2, so that the coil temperature can be ensured to be stably close to the target temperature under the condition that the first adjusting amplitude is larger than the second adjusting amplitude, and the stability of the dehumidification control process of the heat pump dryer is ensured.
Based on the above, taking the example that the third temperature difference threshold value is 10 and the fourth temperature difference threshold value is 0, assuming that the humidity of the drying chamber is determined to be less than or equal to 0 < (Tp-Tm) and less than or equal to 10 at first, indicating that the humidity of the drying chamber does not reach the target humidity requirement, and entering dehumidification control logic corresponding to the interval of less than or equal to 0 < (Tp-Tm) and less than or equal to 10. In this case, the valve opening K of the first expansion valve may be set based on the temperature difference at this time 1 The difference obtained by subtracting the preset valve opening from the current value of (a) is used as the initial specified valve opening, such asThe determined initial specified valve opening may be K 1 -10; then, valve opening adjustment based on the coil temperature variation is performed on the basis of the initial specified valve opening. For example, the second set period may be taken as one period, for example, 20 seconds, and the temperature change amount Δt=t1-t0 of the coil temperature Tp of the dehumidification coil may be determined once every period, where t1 is the coil temperature at the end of the 20 second period, and t0 is the coil temperature at the beginning of the 20 second period; assuming that the first variation threshold is tx1, the second variation threshold is tx2, and tx1 > tx2, the first adjustment amplitude is 5, and the second adjustment amplitude is 2, there are: if Deltat > tx1, the valve opening of the first expansion valve at this time may be reduced to K 1 ＝K 1 -5; if Deltat is less than or equal to tx2, the valve opening degree of the first expansion valve at the time can be increased to K 1 ＝K 1 +2. Repeating the execution of the valve opening K based on Deltat 1 And (3) performing an adjustment process and re-acquiring Tp until (Tp-Tm) is less than or equal to 0, entering dehumidification control logic corresponding to the interval of-3 < (Tp-Tm) is less than or equal to 0, and continuing to perform dehumidification control according to the control logic.
As shown in connection with fig. 2, in an exemplary embodiment of the present invention, in case that the temperature difference between the coil temperature and the target temperature is greater than the first temperature difference threshold and less than or equal to the third temperature difference threshold, the second shut-off valve 213 in the drying thermodynamic loop is opened, and the valve opening of the second expansion valve 207 is controlled to be a preset valve opening.
For example, in the case where the temperature difference between the coil temperature and the target temperature is greater than the first temperature difference threshold value and less than or equal to the second temperature difference threshold value, the valve opening degree K of the second expansion valve 207 may be controlled 2 Is maintained in the current valve opening state.
For example, in the case where the temperature difference between the coil temperature and the target temperature is greater than the second temperature difference threshold value and less than or equal to the third temperature difference threshold value, the valve opening degree K of the second expansion valve 207 may be controlled 2 ＝K 2max 2, wherein K 2max K is the maximum valve opening of the second expansion valve 207, for example, the valve opening of the second expansion valve 207 ranges from 80 to 360 2max 360.
In an example embodiment of the present invention, adjusting the valve opening of the first expansion valve based on the initial specified valve opening of the first expansion valve based on the temperature difference may further include: determining a maximum valve opening of the first expansion valve as an initial specified valve opening in the case where the temperature difference is greater than a third temperature difference threshold; and adjusting the valve opening of the first expansion valve based on the temperature difference and the initial specified valve opening until the temperature difference is less than or equal to a third temperature difference threshold.
In the process of adjusting the valve opening of the first expansion valve by using the temperature difference and the initial designated valve opening, one temperature difference threshold point can be selected in a range larger than a third temperature difference threshold value and is recorded as a fifth temperature difference threshold value, the range larger than the third temperature difference threshold value can be divided into a section larger than the third temperature difference threshold value and smaller than or equal to the fifth temperature difference threshold value and a section larger than the fifth temperature difference threshold value by the fifth temperature difference threshold value, different initial designated valve opening is determined according to different temperature difference sections where the temperature difference is located, and different dehumidification control logic can be adopted for dehumidification.
In an example embodiment, for a case where the temperature difference falls within a fifth temperature difference threshold interval that is greater than the third temperature difference threshold and less than or equal to the fifth temperature difference threshold interval, adjusting the valve opening of the first expansion valve based on the temperature difference and the initially specified valve opening may include: when the temperature difference is larger than the third temperature difference threshold value and smaller than or equal to the fifth temperature difference threshold value, controlling the valve opening of the first expansion valve to be an initial designated valve opening, namely controlling the first expansion valve to work at the maximum valve opening, and acquiring the temperature variation of the temperature of the coil once every second preset time to obtain the temperature variation of the second coil; and adjusting the valve opening of the first expansion valve based on the temperature change amount of the second coil until the temperature difference is less than or equal to a third temperature difference threshold.
For example, adjusting the valve opening of the first expansion valve based on the second coil temperature variation may include: responsive to the second coil temperature variation being greater than a fifth variation threshold, reducing the valve opening of the first expansion valve by a fifth adjustment magnitude; and responsive to the second coil temperature variation being less than or equal to a sixth variation threshold, increasing the valve opening of the first expansion valve by a sixth adjustment magnitude. By way of example, the fifth variation threshold is greater than the sixth variation threshold, so that the second coil temperature variation can be stabilized between the fifth variation threshold and the sixth variation threshold, preventing the heat pump dryer from being out of control due to the greater variation, and reducing energy consumption. For example, the fifth adjustment amplitude may be greater than or equal to the sixth adjustment amplitude.
It may be appreciated that, in the embodiment of the present invention, the values of the fifth adjustment amplitude, the sixth adjustment amplitude, the fifth variation threshold, and the sixth variation threshold may be set according to actual needs. For example, the fifth variation threshold and the sixth variation threshold are tx5 and tx6, respectively, where tx 5=2 and tx 6=1 may be taken. For example, the fifth adjusting amplitude can be 5, and the sixth adjusting amplitude can be 2, so that the coil temperature can be ensured to be stably close to the target temperature under the condition that the fifth adjusting amplitude is larger than the sixth adjusting amplitude, and the stability of the dehumidification control process of the heat pump dryer is ensured.
Based on this, taking the example that the third temperature difference threshold is 10 and the fifth temperature difference threshold is 20, assuming that 10 < (Tp-Tm) is less than or equal to 20 is determined from the beginning, the humidity of the drying chamber is considered to be large, and dehumidification control logic corresponding to the interval of 10 < (Tp-Tm) is entered. In this case, the valve opening K of the first expansion valve may be set based on the temperature difference at this time 1 Controlling the maximum valve opening K of the first expansion valve 1max For example, if the valve opening of the first expansion valve is 80-360, K 1max =360; then at K 1max And (3) adjusting the opening of the valve based on the coil temperature variation. For example, the third set time period may be set as one period, for example, 25 seconds, and the temperature change amount Δt=t1-t0 of the coil temperature Tp of the dehumidification coil may be determined once every period, where t1 is the coil temperature at the end of the 25 second period, and t0 is the coil temperature at the beginning of the 25 second period; assuming that the fifth variation threshold is tx5, the sixth variation threshold is tx6, and tx5 > tx6, the fifth adjustment amplitude is 5, and the sixth adjustment amplitude is 2, there are: if Deltat > tx5, the valve opening of the first expansion valve at this time may be reduced to K 1 ＝K 1 -5; if Deltat is less than or equal to tx6, the valve opening degree of the first expansion valve at the time can be increased to K 1 ＝K 1 +2. Repeated execution baseAt Deltat for valve opening K 1 And (3) performing regulation until (Tp-Tm) is less than or equal to 10, entering dehumidification control logic corresponding to the interval of less than or equal to 0 < (Tp-Tm) is less than or equal to 10, and continuously performing dehumidification control according to the control logic.
In an example embodiment, for a case where the temperature difference falls within a threshold temperature difference interval, adjusting the valve opening of the first expansion valve based on the temperature difference and the initial specified valve opening may include: and controlling the valve opening of the first expansion valve to be maintained at the initial designated valve opening in the case that the temperature difference is greater than the fifth temperature difference threshold. The initial specified valve opening is the maximum valve opening of the first expansion valve.
In this case, assuming that the fifth temperature difference threshold is 20, and (Tp-Tm) > 20 is initially determined, the dehumidification control logic corresponding to the section (Tp-Tm) > 20 is entered. In this case, the valve opening degree K of the first expansion valve is controlled 1 Maintained at the maximum valve opening K of the first expansion valve 1max Until (Tp-Tm) is less than or equal to 20, the dehumidification control logic corresponding to the interval of 10 < (Tp-Tm) is less than or equal to 20 can be entered, and the control of the dehumidification process can be continuously performed according to the control logic.
In the embodiment of the invention, under the condition that the temperature difference is larger than the third temperature difference threshold value, the humidity of the drying chamber can be considered to be larger, and at the moment, the maximum dehumidification efficiency can be exerted by controlling the valve opening of the first expansion valve to the maximum valve opening, so that the humidity of the drying chamber is reduced as soon as possible, the dehumidification efficiency is improved, the drying quality of the heat pump dryer is further ensured, and the drying efficiency is improved.
In an exemplary embodiment of the present invention, as shown in fig. 2, when the temperature difference between the coil temperature and the target temperature is greater than the third temperature difference threshold, the humidity of the drying chamber is considered to be greater, and at this time, the second stop valve 213 in the drying thermodynamic loop may be closed, so that the refrigerant may completely pass through the dehumidification thermodynamic loop, thereby improving the dehumidification strength and efficiency, further ensuring the drying quality of the heat pump dryer, and improving the drying efficiency.
Based on the above embodiments, it may be understood that in the embodiment of the present invention, when the dehumidification process of the heat pump dryer is controlled based on the temperature difference between the coil temperature and the target temperature of the heat pump dryer, the control logic of the first stop valve, the first expansion valve, the second stop valve, and the second expansion valve may be different according to the temperature difference. The values of the first temperature difference threshold, the second temperature difference threshold, the third temperature difference threshold, the fourth temperature difference threshold and the fifth temperature difference threshold can be set according to actual needs.
In the following, referring to fig. 2, a dehumidification control method of a heat pump dryer according to an embodiment of the present invention is further illustrated by taking a first temperature difference threshold of-5, a second temperature difference threshold of-3, a third temperature difference threshold of 10, a fourth temperature difference threshold of 0, and a fifth temperature difference threshold of 20 as an example.
Assuming that the temperature difference (Tp-Tm) > 20 determined by the heat pump dryer at first, the dehumidification control logic corresponding to the interval (Tp-Tm) > 20 is entered. In this case, the second shut-off valve 213 may be closed, the first shut-off valve 205 may be opened, and the refrigerant may be circulated entirely through the dehumidification thermodynamic loop. At this time, the valve opening degree K of the first expansion valve 206 may be controlled 1 =k1max, at K 1 Is used for controlling the dehumidification of the valve opening; in the process of executing the dehumidification, the heat pump dryer acquires Tp again and determines a temperature difference (Tp-Tm), and as the dehumidification is carried out, (Tp-Tm) is gradually reduced until (Tp-Tm) is less than or equal to 20, and dehumidification control logic corresponding to a section of 10 < (Tp-Tm) is entered.
In the case where 10 < (Tp-Tm) < 20, the closed state of the second shut-off valve 213 and the open state of the first shut-off valve 205 can be maintained, K can be controlled 1 ＝K 1max The method comprises the steps of carrying out a first treatment on the surface of the And the temperature change amount Δt of Tp may be determined with the set period of time as one cycle, for example, with 20 seconds as one cycle, and K may be adjusted based on the magnitude relation between Δt and the fifth change amount threshold value tx5 and the sixth change amount threshold value tx6 1 For example, if Δt > tx5, K will be 1 Reduced to K 1 -5, if Δt.ltoreq.tx 6, K 1 Increase to K 1 +2. Again, tp will be retrieved and the temperature difference (Tp-Tm) will be determined during this process until (Tp-Tm). Ltoreq.10, and the dehumidification control logic corresponding to the interval 0 < (Tp-Tm). Ltoreq.10 will be entered.
In the case where 0 < (Tp-Tm). Ltoreq.10, the second section may be turned onCheck valve 213 maintains the open state of first shutoff valve 205, controlling K 2 ＝K 2max 2; at the same time, control K 1 ＝K 1 -10, then on the basis of this, the temperature variation Δt of Tp can be determined with a set period of time as one cycle, for example with 20 seconds as one cycle, and K can then be adjusted based on the magnitude relation between Δt and the first variation threshold value tx1 and the second variation threshold value tx2 1 For example, if Δt > tx1, K will be 1 Reduced to K 1 -5, if Δt.ltoreq.tx2, K 1 Increase to K 1 +2. Again, tp will be retrieved and the temperature difference (Tp-Tm) will be determined during this process until (Tp-Tm). Ltoreq.0, and the dehumidification control logic corresponding to the interval-3 < (Tp-Tm). Ltoreq.0 will be entered.
In the case of-3.ltoreq.Tp-Tm.ltoreq.0, the open state of the second shutoff valve 213 and the first shutoff valve 205 can be maintained, K is controlled 2 ＝K 2max 2; at the same time, hold K 1 On the basis, the temperature change delta t of Tp can be judged by taking a set time period as one period, for example, 20 seconds as one period, and K can be adjusted based on the magnitude relation of delta t and 0 1 For example, if Δt > 0, K will be 1 Reduced to K 1 -2, if Δt is less than or equal to 0, K 1 Increase to K 1 +2. Again, tp will be retrieved and the temperature difference (Tp-Tm) will be determined during this process until (Tp-Tm) is less than or equal to-3, and the dehumidification control logic corresponding to the interval of-5 < (Tp-Tm) less than or equal to-3 will be entered.
In the case where-5 < (Tp-Tm) < 3, the opening states of the second shut-off valve 213 and the first shut-off valve 205 can be maintained, K can be controlled 1 Hold at K 1min Wherein K is 1min Is the minimum valve opening of the first expansion valve 206. Again, tp will be retrieved and the temperature difference (Tp-Tm) will be determined during this process until (Tp-Tm) is less than or equal to-5, and the dehumidification control logic corresponding to the interval of (Tp-Tm) less than or equal to-5 will be entered. For example, in the case of-5 < (Tp-Tm). Ltoreq.3, K 2 Can be controlled according to the control logic of the drying thermodynamic loop.
In the case of (Tp-Tm). Ltoreq.5, it is considered that the humidity of the drying chamber has reached the humidity requirement, the opening state of the second shut-off valve 213 can be maintained, the first shut-off valve 205 is closed, and the dehumidification control is ended.
Therefore, proper dehumidification control logic can be selected for dehumidification according to the temperature difference between the coil temperature of the dehumidification disc and the target temperature, so that the heat pump dryer works in a better dehumidification state, the humidity requirement of the drying chamber is ensured, the drying quality is ensured, the drying efficiency is improved, and the energy consumption is reduced.
The dehumidification control device of the heat pump dryer provided by the invention is described below, and the dehumidification control device of the heat pump dryer described below and the dehumidification control method of the heat pump dryer described above can be referred to correspondingly.
Fig. 4 schematically illustrates a structural diagram of a dehumidification control device of a heat pump dryer according to an embodiment of the present disclosure, and referring to fig. 4, a dehumidification control device 400 of a heat pump dryer may include an acquisition module 410, an adjustment module 420, and a closing module 430. The acquisition module 410 is used for acquiring the coil temperature of the dehumidifier of the heat pump dryer and calculating the temperature difference between the coil temperature and the dehumidification target temperature; the adjusting module 420 is configured to, in response to the temperature difference being greater than a first temperature difference threshold, open the first stop valve, and based on the temperature difference, adjust a valve opening of the first expansion valve based on an initial specified valve opening of the first expansion valve to adjust a coil temperature, and trigger the acquiring module 410 to re-acquire the coil temperature of the dehumidifier, the initial specified valve opening being determined based on the temperature difference; the closing module 430 is configured to close the first stop valve if the temperature difference is less than or equal to a first temperature difference threshold; the first stop valve is used for opening or closing a dehumidification thermodynamic loop of the heat pump dryer, and the compressor, the condenser, the first stop valve, the first expansion valve and the dehumidifier of the heat pump dryer are sequentially connected to form the dehumidification thermodynamic loop.
In an example embodiment, the adjustment module 420 may include: and the first adjusting unit is used for determining the initial designated valve opening as the minimum valve opening of the first expansion valve under the condition that the temperature difference is larger than the first temperature difference threshold value and smaller than or equal to the second temperature difference threshold value, and controlling the valve opening of the first expansion valve to be kept at the initial designated valve opening until the temperature difference is smaller than or equal to the first temperature difference threshold value.
In an example embodiment, the adjustment module 420 may further include a second adjustment unit, which may include: a determining subunit, configured to determine an initial designated valve opening based on the temperature difference and a current valve opening of the first expansion valve, where the temperature difference is greater than the second temperature difference threshold and less than or equal to the third temperature difference threshold; the first control subunit is used for controlling the valve opening of the first expansion valve to be an initial designated valve opening, and acquiring the temperature variation of the temperature of the coil once every first preset time to acquire the temperature variation of the first coil; and the first regulating subunit is used for regulating the valve opening of the first expansion valve based on the first coil temperature variation until the temperature difference is smaller than or equal to the second temperature difference threshold value.
In an example embodiment, the determining subunit may be specifically configured to determine the initial designated valve opening as a difference between the current valve opening of the first expansion valve and the preset valve opening when the temperature difference is greater than a fourth temperature difference threshold and less than a third temperature difference threshold, where the fourth temperature difference threshold is greater than the second temperature difference threshold. Accordingly, the first conditioning subunit may be specifically configured to: in response to the first coil temperature variation being greater than a first variation threshold, reducing a valve opening of the first expansion valve by a first adjustment magnitude; and increasing the valve opening of the first expansion valve by a second adjustment amplitude in response to the first coil temperature variation being less than or equal to a second variation threshold, the second variation threshold being less than the first variation threshold.
In an example embodiment, the determining subunit may be specifically configured to determine that the initially specified valve opening is the current valve opening of the first expansion valve when the temperature difference is greater than the second temperature difference threshold and less than or equal to the fourth temperature difference threshold, and the fourth temperature difference threshold is less than the third temperature difference threshold. Accordingly, the first conditioning subunit may be specifically configured to: reducing the valve opening of the first expansion valve by a third adjustment amplitude in response to the first coil temperature variation being greater than a third variation threshold; and increasing the valve opening of the first expansion valve by a fourth adjustment amplitude in response to the first coil temperature variation being less than or equal to a fourth variation threshold, the fourth variation threshold being less than or equal to the third variation threshold.
In an example embodiment, the adjustment module 420 may further include: the third adjusting unit is used for opening the second stop valve and controlling the valve opening of the second expansion valve to be a preset valve opening under the condition that the temperature difference is larger than the first temperature difference threshold value and smaller than the third temperature difference threshold value; the second stop valve is used for opening or closing a drying thermodynamic loop of the heat pump dryer, and the evaporator, the compressor, the condenser, the second stop valve and the second expansion valve of the heat pump dryer are sequentially connected to form the drying thermodynamic loop.
In an example embodiment, the adjustment module 420 may further include a fourth adjustment unit for: under the condition that the temperature difference is larger than a third temperature difference threshold value, determining that the initial designated valve opening is the maximum valve opening of the first expansion valve; and adjusting the valve opening of the first expansion valve based on the temperature difference and the initial designated valve opening until the temperature difference is less than or equal to a third temperature difference threshold.
In an example embodiment, the fourth adjusting unit may include: the second control subunit is used for controlling the valve opening of the first expansion valve to be an initial designated valve opening under the condition that the temperature difference is larger than a third temperature difference threshold value and smaller than or equal to a fifth temperature difference threshold value, and acquiring the temperature variation of the temperature of the coil once every second preset time to obtain a second coil temperature variation; and the second regulating subunit is used for regulating the valve opening degree of the first expansion valve based on the temperature variation of the second coil until the temperature difference is smaller than the third temperature difference threshold value.
In an example embodiment, the second conditioning subunit may be specifically configured to: responsive to the second coil temperature variation being greater than a fifth variation threshold, reducing the valve opening of the first expansion valve by a fifth adjustment magnitude; and in response to the second coil temperature variation being less than or equal to a sixth variation threshold, increasing the valve opening of the first expansion valve by a sixth adjustment magnitude, the sixth variation threshold being less than the fifth variation threshold.
In an example embodiment, the fourth adjusting unit may further include: and a third control subunit for controlling the valve opening of the first expansion valve to be kept at the initial designated valve opening under the condition that the temperature difference is larger than the fifth temperature difference threshold value.
In an example embodiment, the adjustment module 420 may further include: a fifth adjusting unit for closing the second stop valve when the temperature difference is greater than the third temperature difference threshold; the second stop valve is used for opening or closing a drying thermodynamic loop of the heat pump dryer, and the evaporator, the compressor, the condenser, the second stop valve and the second expansion valve of the heat pump dryer are sequentially connected to form the drying thermodynamic loop.
Fig. 5 is a schematic structural diagram of a controller in a heat pump dryer according to an embodiment of the present invention, and as shown in fig. 5, the controller 212 may include: processor 510, communication interface (Communication Interface) 520, memory 530, and communication bus 540, wherein processor 510, communication interface 520, memory 530 complete communication with each other through communication bus 540. Processor 510 may invoke logic instructions in memory 530 to perform the method for controlling dehumidification of a heat pump dryer provided by the above method embodiments, which may include, for example: acquiring the coil temperature of a dehumidifier of the heat pump dryer, and calculating the temperature difference between the coil temperature and the target temperature; opening a first stop valve in response to the temperature difference being greater than a first temperature difference threshold, and adjusting a valve opening of the first expansion valve based on an initial designated valve opening of the first expansion valve based on the temperature difference to adjust a coil temperature, wherein the initial designated valve opening is determined based on the temperature difference; and repeating all the steps until the temperature difference is smaller than or equal to the first temperature difference threshold value, and closing the first stop valve.
Further, the logic instructions in the memory 530 described above may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product, where the computer program product includes a computer program, where the computer program can be stored on a non-transitory computer readable storage medium, where the computer program, when executed by a processor, can perform a method for controlling dehumidification of a heat pump dryer provided in the above method embodiments, where the method may include: acquiring the coil temperature of a dehumidifier of the heat pump dryer, and calculating the temperature difference between the coil temperature and the target temperature; opening a first stop valve in response to the temperature difference being greater than a first temperature difference threshold, and adjusting a valve opening of the first expansion valve based on an initial designated valve opening of the first expansion valve based on the temperature difference to adjust a coil temperature, wherein the initial designated valve opening is determined based on the temperature difference; and repeating all the steps until the temperature difference is smaller than or equal to the first temperature difference threshold value, and closing the first stop valve.
In still another aspect, the present invention further provides a non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, is implemented to perform the dehumidification control method of a heat pump dryer provided by the above method embodiments, and the method may include, for example: acquiring the coil temperature of a dehumidifier of the heat pump dryer, and calculating the temperature difference between the coil temperature and the target temperature; opening a first stop valve in response to the temperature difference being greater than a first temperature difference threshold, and adjusting a valve opening of the first expansion valve based on an initial designated valve opening of the first expansion valve based on the temperature difference to adjust a coil temperature, wherein the initial designated valve opening is determined based on the temperature difference; and repeating all the steps until the temperature difference is smaller than or equal to the first temperature difference threshold value, and closing the first stop valve.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (12)

1. A dehumidification control method of a heat pump dryer, comprising:
acquiring the coil temperature of a dehumidifier of the heat pump dryer, and calculating the temperature difference between the coil temperature and the target temperature;
opening a first stop valve in response to the temperature difference being greater than a first temperature difference threshold, and adjusting a valve opening of a first expansion valve based on an initial specified valve opening of the first expansion valve based on the temperature difference to adjust the coil temperature, the initial specified valve opening being determined based on the temperature difference;
repeating all the steps until the temperature difference is smaller than or equal to the first temperature difference threshold value, and closing the first stop valve;
the first stop valve is used for opening or closing a dehumidification thermodynamic loop of the heat pump dryer, and the compressor, the condenser, the first stop valve, the first expansion valve and the dehumidifier of the heat pump dryer are sequentially connected to form the dehumidification thermodynamic loop;
the adjusting the valve opening of the first expansion valve based on the initial specified valve opening of the first expansion valve based on the temperature difference includes:
determining an initial designated valve opening as a minimum valve opening of the first expansion valve under the condition that the temperature difference is larger than the first temperature difference threshold and smaller than or equal to a second temperature difference threshold, and controlling the valve opening of the first expansion valve to be kept at the initial designated valve opening until the temperature difference is smaller than or equal to the first temperature difference threshold;
Determining an initial designated valve opening based on the temperature difference and a current valve opening of the first expansion valve when the temperature difference is greater than the second temperature difference threshold and less than or equal to a third temperature difference threshold; controlling the valve opening of the first expansion valve to be an initial designated valve opening, and acquiring the temperature variation of the coil temperature once every first preset time to obtain a first coil temperature variation; adjusting a valve opening of the first expansion valve based on the first coil temperature variation until the temperature difference is less than or equal to the second temperature difference threshold;
determining an initial designated valve opening as a maximum valve opening of the first expansion valve if the temperature difference is greater than the third temperature difference threshold; and adjusting the valve opening of the first expansion valve based on the temperature difference and an initial designated valve opening until the temperature difference is less than or equal to the third temperature difference threshold.
2. The dehumidification control method of a heat pump dryer according to claim 1, wherein the determining the initial specified valve opening based on the temperature difference and a current valve opening of the first expansion valve includes:
determining an initial designated valve opening as a difference value between the current valve opening of the first expansion valve and a preset valve opening under the condition that the temperature difference is larger than a fourth temperature difference threshold and smaller than the third temperature difference threshold, wherein the fourth temperature difference threshold is larger than the second temperature difference threshold;
The adjusting the valve opening of the first expansion valve based on the first coil temperature variation amount includes:
reducing a valve opening of the first expansion valve by a first adjustment amplitude in response to the first coil temperature variation being greater than a first variation threshold;
and in response to the first coil temperature variation being less than or equal to a second variation threshold, increasing a valve opening of the first expansion valve by a second adjustment amplitude, the second variation threshold being less than the first variation threshold.
3. The dehumidification control method of a heat pump dryer according to claim 1, wherein the determining the initial specified valve opening based on the temperature difference and a current valve opening of the first expansion valve includes:
determining an initial designated valve opening as the current valve opening of the first expansion valve under the condition that the temperature difference is larger than the second temperature difference threshold and smaller than or equal to a fourth temperature difference threshold, wherein the fourth temperature difference threshold is smaller than the third temperature difference threshold;
the adjusting the valve opening of the first expansion valve based on the first coil temperature variation amount includes:
reducing the valve opening of the first expansion valve by a third adjustment amplitude in response to the first coil temperature variation being greater than a third variation threshold;
And in response to the first coil temperature variation being less than or equal to a fourth variation threshold, increasing a valve opening of the first expansion valve by a fourth adjustment amplitude, the fourth variation threshold being less than or equal to the third variation threshold.
4. A dehumidification control method of a heat pump dryer according to any one of claims 1 to 3, further comprising:
opening a second stop valve and controlling the valve opening of the second expansion valve to be a preset valve opening under the condition that the temperature difference is larger than the first temperature difference threshold and smaller than the third temperature difference threshold;
the second stop valve is used for opening or closing a drying thermal loop of the heat pump dryer, and the evaporator, the compressor, the condenser, the second stop valve and the second expansion valve of the heat pump dryer are sequentially connected to form the drying thermal loop.
5. The dehumidification control method of a heat pump dryer according to claim 1, wherein the adjusting the valve opening of the first expansion valve based on the temperature difference and the initial specified valve opening comprises:
controlling the valve opening of the first expansion valve to be an initial designated valve opening under the condition that the temperature difference is larger than the third temperature difference threshold and smaller than or equal to a fifth temperature difference threshold, and acquiring the temperature variation of the coil temperature once every second preset time to obtain a second coil temperature variation;
And adjusting the valve opening of the first expansion valve based on the second coil temperature variation until the temperature difference is less than the third temperature difference threshold.
6. The dehumidification control method of a heat pump dryer of claim 5, wherein the adjusting the valve opening of the first expansion valve based on the second coil temperature variation amount comprises:
reducing the valve opening of the first expansion valve by a fifth adjustment amplitude in response to the second coil temperature variation being greater than a fifth variation threshold;
and in response to the second coil temperature variation being less than or equal to a sixth variation threshold, increasing the valve opening of the first expansion valve by a sixth adjustment amplitude, the sixth variation threshold being less than the fifth variation threshold.
7. The dehumidification control method of a heat pump dryer of claim 5, further comprising:
and controlling the valve opening of the first expansion valve to be kept at an initial designated valve opening, wherein the initial designated valve opening is the maximum valve opening of the first expansion valve under the condition that the temperature difference is larger than the fifth temperature difference threshold.
8. The dehumidification control method of a heat pump dryer according to any one of claims 1, 5 to 7, further comprising:
Closing a second shut-off valve if the temperature difference is greater than the third temperature difference threshold;
the second stop valve is used for opening or closing a drying heating power loop of the heat pump dryer, and the evaporator, the compressor, the condenser, the second stop valve and the second expansion valve of the heat pump dryer are sequentially connected to form the drying heating power loop.
9. A dehumidification control device of a heat pump dryer, comprising:
the acquisition module is used for acquiring the coil temperature of the dehumidifier of the heat pump dryer and calculating the temperature difference between the coil temperature and the dehumidification target temperature;
the adjusting module is used for responding to the temperature difference to be larger than a first temperature difference threshold value, opening a first stop valve, adjusting the valve opening of a first expansion valve based on the initial designated valve opening of the first expansion valve on the basis of the temperature difference so as to adjust the coil temperature, triggering the acquiring module to acquire the coil temperature of the dehumidifier again, and determining the initial designated valve opening based on the temperature difference;
a closing module for closing the first shut-off valve if the temperature difference is less than or equal to the first temperature difference threshold;
The first stop valve is used for opening or closing a dehumidification thermodynamic loop of the heat pump dryer, and the compressor, the condenser, the first stop valve, the first expansion valve and the dehumidifier of the heat pump dryer are sequentially connected to form the dehumidification thermodynamic loop;
the adjusting the valve opening of the first expansion valve based on the initial specified valve opening of the first expansion valve based on the temperature difference includes:
determining an initial designated valve opening as a minimum valve opening of the first expansion valve under the condition that the temperature difference is larger than the first temperature difference threshold and smaller than or equal to a second temperature difference threshold, and controlling the valve opening of the first expansion valve to be kept at the initial designated valve opening until the temperature difference is smaller than or equal to the first temperature difference threshold;
determining an initial designated valve opening based on the temperature difference and a current valve opening of the first expansion valve when the temperature difference is greater than the second temperature difference threshold and less than or equal to a third temperature difference threshold; controlling the valve opening of the first expansion valve to be an initial designated valve opening, and acquiring the temperature variation of the coil temperature once every first preset time to obtain a first coil temperature variation; adjusting a valve opening of the first expansion valve based on the first coil temperature variation until the temperature difference is less than or equal to the second temperature difference threshold;
Determining an initial designated valve opening as a maximum valve opening of the first expansion valve if the temperature difference is greater than the third temperature difference threshold; and adjusting the valve opening of the first expansion valve based on the temperature difference and an initial designated valve opening until the temperature difference is less than or equal to the third temperature difference threshold.
10. The heat pump dryer is characterized by comprising an evaporator, a compressor, a condenser, a dehumidifier, a first stop valve, a first expansion valve, a first temperature sensor, a second temperature sensor, a humidity sensor and a controller;
the compressor, the condenser, the first stop valve, the first expansion valve and the dehumidifier are sequentially connected to form a dehumidification thermodynamic loop, and the first stop valve is used for opening or closing the dehumidification thermodynamic loop;
the first temperature sensor is arranged on a dehumidification coil of the dehumidifier and is used for collecting the coil temperature of the dehumidifier;
the second temperature sensor and the humidity sensor are arranged at the air return port of the heat pump dryer and are respectively and electrically connected with the controller, the second temperature sensor is used for collecting the air return port temperature, the humidity sensor is used for collecting the air return port humidity, and the air return port temperature and the air return port humidity are used for determining the target temperature;
The controller includes a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the dehumidification control method of the heat pump dryer according to any one of claims 1 to 8 when the computer program is executed.
11. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the computer program, when executed by a processor, implements the dehumidification control method of the heat pump dryer according to any one of claims 1 to 8.
12. A computer program product comprising a computer program, characterized in that the computer program, when executed by a processor, implements a dehumidification control method of a heat pump dryer according to any one of claims 1 to 8.
CN202210950427.2A 2022-08-09 2022-08-09 Dehumidification control method and device of heat pump dryer and heat pump dryer Active CN115523742B (en)

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CN114060974A (en) * 2021-11-24 2022-02-18 美的集团武汉制冷设备有限公司 Fresh air equipment control method and device, fresh air equipment and storage medium
CN114413612A (en) * 2021-12-31 2022-04-29 青岛海尔空调电子有限公司 Method and device for controlling semi-closed heat pump drying equipment, electronic equipment and storage medium
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CN107120953A (en) * 2017-04-11 2017-09-01 贵州九科新能源有限公司 The control device for electronic expansion valve and method of a kind of air source heat pump dryer
CN107192160A (en) * 2017-07-25 2017-09-22 胡少林 A kind of air conditioner dehumidifier combined unit
CN109489402A (en) * 2018-10-29 2019-03-19 江苏天舒电器有限公司 A kind of dehumidifying drying heat pump control method
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