CN115523745B - Heat pump dryer control method and device, heat pump dryer and storage medium - Google Patents
Heat pump dryer control method and device, heat pump dryer and storage medium Download PDFInfo
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- CN115523745B CN115523745B CN202210958445.5A CN202210958445A CN115523745B CN 115523745 B CN115523745 B CN 115523745B CN 202210958445 A CN202210958445 A CN 202210958445A CN 115523745 B CN115523745 B CN 115523745B
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- 238000000034 method Methods 0.000 title claims abstract description 57
- 238000010438 heat treatment Methods 0.000 claims abstract description 81
- 230000008859 change Effects 0.000 claims description 42
- 238000004590 computer program Methods 0.000 claims description 16
- 238000001035 drying Methods 0.000 abstract description 40
- 238000005265 energy consumption Methods 0.000 abstract description 10
- 230000001276 controlling effect Effects 0.000 description 51
- 238000004891 communication Methods 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000005485 electric heating Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 4
- 230000001737 promoting effect Effects 0.000 description 3
- 238000011897 real-time detection Methods 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
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Classifications
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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
- F26B21/10—Temperature; Pressure
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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
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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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
- F26B21/001—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
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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
- F26B21/02—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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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention provides a heat pump dryer control method, a heat pump dryer control device, a heat pump dryer and a storage medium, wherein the heat pump dryer control method comprises the following steps: under the condition that the heat pump dryer heats, controlling the operation of a compressor based on the temperature difference between the target set temperature and the temperature of the return air inlet, and controlling the starting and stopping of a heating device so as to adjust the temperature rise of the return air inlet; and under the condition that the absolute value of the temperature difference is smaller than the target temperature threshold value and the humidity of the return air inlet in the target duration is continuously smaller than the target humidity threshold value, controlling the heat pump dryer to stop heating. The invention can accurately judge the drying state of the object, thereby finely controlling the compressor and the heating device according to different drying states, achieving the purpose of accurately controlling the dryness of the dried object, improving the drying efficiency, reducing the energy consumption of the system and improving the energy-saving and emission-reducing efficiency of the system.
Description
Technical Field
The present invention relates to the field of heat pump dryers, and in particular, to a heat pump dryer control method and apparatus, a heat pump dryer, and a storage medium.
Background
At present, the heat pump dryer is widely applied to various fields including fields of chemical industry, medicines, products, wood, agricultural and sideline products and the like, and has the advantages of safety, environmental protection, energy conservation, high efficiency and the like.
The heat pump dryer heats and dehumidifies the object by using the condensation heat of the air conditioner. During heating, the refrigerant is continuously evaporated, compressed, condensed, throttled and re-evaporated in the system and the heat released in the thermodynamic cycle is continuously transferred to the stoving chamber to dry the article continuously. However, the existing control method is too simple and rough, and it is difficult to accurately judge whether the dryness of the heated and dehumidified object meets the requirement, the drying efficiency is poor, and the energy consumption is high.
Therefore, how to better control the heat pump dryer has become a technical problem to be solved in the industry.
Disclosure of Invention
The invention provides a heat pump dryer control method and device, a heat pump dryer and a storage medium, which are used for better controlling the heat pump dryer, improving drying efficiency and reducing energy consumption.
The invention provides a control method of a heat pump dryer, which comprises the following steps:
Under the condition that the heat pump dryer heats, controlling the operation of a compressor based on the temperature difference between the target set temperature and the temperature of the return air inlet, and controlling the starting and stopping of a heating device so as to adjust the temperature rise of the return air inlet;
and under the condition that the absolute value of the temperature difference is smaller than the target temperature threshold value and the humidity of the return air inlet in the target duration is continuously smaller than the target humidity threshold value, controlling the heat pump dryer to stop heating.
According to the control method of the heat pump dryer provided by the invention, the operation of the compressor is controlled and the start and stop of the heating device are controlled based on the temperature difference between the target set temperature and the temperature of the return air inlet, and the control method comprises the following steps:
and controlling the heating device to start and controlling the compressor to operate at the maximum operating frequency under the condition that the temperature difference between the target set temperature and the return air inlet temperature is larger than a first threshold value.
According to the heat pump dryer control method provided by the invention, the method further comprises the following steps:
and under the condition that the temperature difference between the target set temperature and the return air inlet temperature is larger than the second threshold value and not larger than the first threshold value, controlling the heating device to stop running, and controlling the compressor to run at the maximum running frequency.
According to the heat pump dryer control method provided by the invention, the method further comprises the following steps:
and controlling the compressor to operate based on a first operating frequency and a first control mode under the condition that the temperature difference between the target set temperature and the return air inlet temperature is greater than zero and not greater than a second threshold value, wherein the first operating frequency is obtained by subtracting a first frequency threshold value from the maximum operating frequency of the compressor.
According to the control method of the heat pump dryer provided by the invention, the control of the operation of the compressor based on the first operation frequency and the first control mode comprises the following steps:
under the condition that the change trend of the temperature of the return air inlet is gradually increased in the previous operation period, controlling the compressor to maintain the operation frequency corresponding to the previous operation period to operate in the current operation period; wherein, under the condition that the temperature difference between the target set temperature and the return air inlet temperature is greater than zero and not greater than a second threshold value, the corresponding operation frequency of the first operation period is the first operation frequency;
and under the condition that the change trend of the temperature of the return air inlet is not gradually increased in the previous operation period, controlling the compressor to operate based on a second operation frequency in the current operation period, wherein the second operation frequency is obtained by increasing a second frequency threshold value based on the operation frequency corresponding to the previous operation period.
According to the heat pump dryer control method provided by the invention, the method further comprises the following steps:
and controlling the compressor to operate based on the current operating frequency and the second control mode under the condition that the temperature difference between the target set temperature and the return air inlet temperature is not greater than zero, wherein the current operating frequency is obtained by subtracting a third frequency threshold value from the operating frequency corresponding to the previous operating period.
According to the control method of the heat pump dryer provided by the invention, the control of the compressor to operate based on the current operating frequency and the second control mode comprises the following steps:
under the condition that the change trend of the temperature of the return air inlet is gradually increased in the previous operation period, controlling the compressor to operate based on a third operation frequency in the current operation period, wherein the third operation frequency is obtained by subtracting a fourth frequency threshold value from the operation frequency corresponding to the previous operation period; wherein, under the condition that the temperature difference between the target set temperature and the return air inlet temperature is not more than zero, the corresponding operation frequency of the first operation period is the current operation frequency;
and under the condition that the change trend of the temperature of the return air inlet is not gradually increased in the previous operation period, controlling the compressor to maintain the operation frequency corresponding to the previous operation period to operate in the current operation period.
The invention also provides a control device of the heat pump dryer, comprising:
the first control module is used for controlling the operation of the compressor based on the temperature difference between the target set temperature and the temperature of the return air inlet under the condition that the heat pump dryer heats, and controlling the starting and stopping of the heating device so as to adjust the temperature rise of the return air inlet;
and the second control module is used for controlling the heat pump dryer to stop heating under the condition that the absolute value of the temperature difference is smaller than the target temperature threshold value and the humidity of the return air inlet in the target duration is continuously smaller than the target humidity threshold value.
The present invention also provides a heat pump dryer comprising:
the dryer comprises a dryer body, an evaporator, a compressor, a condenser, a dehumidifier, a fresh air valve, an air outlet fan and a heating device;
the evaporator, the compressor, the condenser, the dehumidifier, the fresh air valve, the air outlet fan and the heating device are all arranged in the dryer body, and the heating device is arranged between the condenser and the air outlet fan;
further comprises: a controller, a temperature sensor and a humidity sensor;
the heating device, the temperature sensor and the humidity sensor are all electrically connected with the controller; the temperature sensor and the humidity sensor are both arranged at the air return opening; the temperature sensor is used for obtaining the temperature of the retrieving air opening, and the humidity sensor is used for obtaining the humidity of the retrieving air opening;
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 executes the program to realize the control method of the heat pump dryer.
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 heat pump dryer control method as described in any of the above.
The invention also provides a computer program product comprising a computer program which when executed by a processor implements a heat pump dryer control method as described in any one of the above.
According to the heat pump dryer control method, the heat pump dryer control device, the heat pump dryer and the storage medium, the temperature sensor and the humidity sensor are added to the air return port, the operation of the compressor is finely controlled based on the temperature difference between the target set temperature and the detected air return port temperature under the condition that the heat pump dryer is heated, the heating device is additionally arranged, the heating device is controlled to start and stop to assist heat, the rising rate of the temperature of the air return port is regulated, and the drying efficiency is improved; under the condition that the absolute value of the temperature difference between the target set temperature and the air return temperature is smaller than the target temperature threshold value and the air return humidity in the target duration is continuously smaller than the target humidity threshold value, the object can be accurately judged to be dried, and then the heat pump dryer can be controlled to stop heating. Through real-time detection return air inlet temperature and return air inlet humidity, can accurately judge the stoving state of object to carry out fine control to compressor and heating device according to different stoving states, reach the purpose of accurate control by the dryness fraction of stoving thing, when promoting drying efficiency, also reduced the system energy consumption, promoted the energy-conserving emission reduction's of system efficiency.
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 a system structure of a heat pump dryer provided by the present invention;
FIG. 2 is a flow chart of a heat pump dryer control method provided by the invention;
fig. 3 is a schematic structural view of a heat pump dryer control device provided by the present invention;
fig. 4 is a schematic structural view of a controller in a heat pump dryer according to 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.
In the description of the invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The heat pump dryer control method, apparatus, heat pump dryer and storage medium of the present invention are described below with reference to fig. 1 to 4.
Fig. 1 is a schematic diagram of a system structure of a heat pump dryer provided by the invention, as shown in fig. 1, the heat pump dryer comprises a dryer body 1, an evaporator 11, a compressor 12, a condenser 13, a dehumidifier 14, a fresh air valve 15, an air outlet fan 16 at an air outlet 100 and a heating device 17;
the evaporator 11, the compressor 12, the condenser 13, the dehumidifier 14, the fresh air valve 15, the air outlet fan 16 and the heating device 17 are all arranged in the dryer body 1, and the heating device 17 is arranged between the condenser 13 and the air outlet fan 16;
The heat pump dryer further includes: a controller, a temperature sensor 18 and a humidity sensor 19; the heating device 17, the temperature sensor 18 and the humidity sensor 19 are all electrically connected with the controller; the temperature sensor 18 and the humidity sensor 19 are arranged at the air return port 200; the temperature sensor is used for obtaining the temperature of the air retrieving port, and the humidity sensor is used for obtaining the humidity of the air retrieving port;
as shown in fig. 1, one end of an evaporator 11 (external machine) is connected with one end of a compressor 12, the other end of the compressor 12 is connected with one end of a condenser 13 (internal machine), and the other end of the evaporator 11 is connected with the other end of the condenser 13 through an electronic expansion valve; one end of the dehumidifier 14 is connected with the other end of the condenser 13 through an electronic expansion valve, and the other end of the dehumidifier 14 is connected with one end of the evaporator 11 and one end of the compressor 12, so that when the heat pump dryer heats, the refrigerant can continuously repeat the thermodynamic cycle processes of evaporation, compression, condensation, throttling and re-evaporation in the drying system, and at the same time, the heat released in the thermodynamic cycle process is continuously transferred into the drying chamber, and the objects in the drying chamber are continuously heated and dehumidified until being dried.
Fig. 2 is a schematic flow chart of a control method of a heat pump dryer according to the present invention, as shown in fig. 2, including: step 110 and step 120.
Step 110, controlling the operation of a compressor based on the temperature difference between the target set temperature and the temperature of the return air inlet under the condition that the heat pump dryer heats, and controlling the starting and stopping of a heating device so as to adjust the temperature rise of the return air inlet;
specifically, the target set temperature described in the embodiment of the present invention refers to a preset drying temperature, which may be a default set temperature of the system, or a temperature set by a user according to actual needs.
The temperature of the return air inlet described in the embodiment of the invention refers to temperature information of the return air inlet of the drying area, which is acquired in real time through a temperature sensor arranged at the return air inlet.
The heating device described in the embodiments of the present invention may be an electric heating device, a solar heating device, or other heating devices, which is not particularly limited in the present invention.
In the embodiment of the invention, the heating device is additionally arranged, so that the heating device can be started when the temperature difference between the target set temperature and the temperature of the return air inlet is overlarge, the heat released into the drying chamber is increased, and the drying efficiency of objects in the drying area can be effectively improved.
Further, in the embodiment of the invention, under the condition that the heat pump dryer heats, the operation of the compressor is finely controlled based on the temperature difference between the target set temperature and the temperature of the return air inlet, and the heating device is controlled to start under the condition that the temperature difference is large, and the operation is stopped under the condition that the temperature difference is not large, so that the temperature rise of the return air inlet is regulated, the drying intensity of objects in a drying area is increased, the drying speed of the objects is accelerated, and the drying efficiency is improved, and meanwhile, the energy saving and emission reduction effects are ensured.
And step 120, controlling the heat pump dryer to stop heating under the condition that the absolute value of the temperature difference between the target set temperature and the return air inlet temperature is less than the target temperature threshold value and the return air inlet humidity in the target duration is continuously less than the target humidity threshold value.
Specifically, the target temperature threshold described in the embodiments of the present invention refers to a preset temperature threshold, which may be flexibly set according to actual design requirements, for example, the range of the target temperature threshold may be 1 ℃ to 3 ℃.
The target duration described in the embodiment of the invention refers to a preset duration threshold, which can be a default duration threshold of the drying system or a duration threshold set by a user according to actual demands. The value range can be 2 minutes to 5 minutes. Alternatively, in an embodiment of the present invention, the target time period may take a value of 3 minutes.
The target humidity threshold described in the embodiments of the present invention refers to a preset humidity threshold, which may be used to determine whether an object in a drying area is dried. The humidity threshold value can be a default humidity threshold value of the drying system, or can be set by a user according to the material property of the object to be dried. Typically, the target humidity threshold may take a value of 30%.
Further, in the embodiment of the invention, by detecting the air return temperature and the air return humidity, under the condition that the absolute value of the temperature difference between the target set temperature and the air return temperature is less than the target temperature threshold and the air return humidity is continuously less than the target humidity threshold within the target duration, the humidity of the object in the drying area can be effectively reduced, the dryness of the object reaches the requirement, and the heat pump dryer can be controlled to stop heating if the object is dried.
Alternatively, in one particular embodiment, the target temperature threshold may take on a value of 2 ℃. When the target set temperature TC m The absolute value of the temperature difference with the temperature TC of the return air inlet is less than 2 ℃, namely-2 ℃ is less than or equal to TC m And (3) judging the humidity of the return air inlet at the temperature of less than or equal to 2 ℃ at the moment, and if the humidity of the return air inlet of the drying area is detected to be continuously less than 30% in the continuous target time period, such as 3 minutes, indicating that the dried object is dried, and stopping heating of the dryer.
According to the heat pump dryer control method, the temperature sensor and the humidity sensor are added to the air return port, the operation of the compressor is finely controlled based on the temperature difference between the target set temperature and the detected air return port temperature under the condition that the heat pump dryer is heated, the heating device is additionally arranged, the heating device is controlled to be started and stopped for auxiliary heating, the rising rate of the temperature of the air return port is regulated, and the drying efficiency is improved; under the condition that the absolute value of the temperature difference between the target set temperature and the air return temperature is smaller than the target temperature threshold value and the air return humidity in the target duration is continuously smaller than the target humidity threshold value, the object can be accurately judged to be dried, and then the heat pump dryer can be controlled to stop heating. Through real-time detection return air inlet temperature and return air inlet humidity, can accurately judge the stoving state of object to carry out fine control to compressor and heating device according to different stoving states, reach the purpose of accurate control by the dryness fraction of stoving thing, when promoting drying efficiency, also reduced the system energy consumption, promoted the energy-conserving emission reduction's of system efficiency.
Based on the foregoing embodiment, as an optional embodiment, in step 110, controlling the operation of the compressor and controlling the start and stop of the heating device based on the temperature difference between the target set temperature and the return air inlet temperature includes:
and under the condition that the temperature difference between the target set temperature and the return air inlet temperature is larger than a first threshold value, controlling the heating device to start and controlling the compressor to operate at the maximum operating frequency.
Specifically, the first threshold described in the embodiments of the present invention refers to a preset temperature difference threshold, which may be characterized as a threshold in the case that the temperature difference between the target set temperature and the return air inlet temperature is too large, and the value range may be 19 ℃ to 21 ℃.
It is understood that the maximum operating frequency refers to the maximum frequency at which the compressor can operate, which may be determined by the actual capacity and model of the heat pump dryer.
In the embodiment of the invention, under the condition that the temperature difference between the target set temperature and the air return inlet temperature is determined to be larger than the first threshold value, the condition that the temperature difference between the target set temperature and the air return inlet temperature is overlarge at the moment, the air return inlet temperature is far smaller than the target set temperature, the temperature of the drying area is too low, high-intensity heating is required, the compressor can be controlled to operate at the maximum operating frequency at the moment, and the heating device is controlled to start heating.
Alternatively, in a specific embodiment, it is assumed that the target set temperature is expressed as TC m The return air inlet temperature is expressed as TC, and the first threshold value may be 20 ℃, that is, when TC is determined m When TC is higher than 20 ℃, the heating device can be controlled to be started, and the compressor can be controlled to operate at the maximum operating frequency.
According to the method provided by the embodiment of the invention, the heating device is additionally arranged, so that the heating device is automatically started to release heat under the condition that the temperature of the return air inlet is far less than the target set temperature, and the compressor is controlled to run at the maximum running frequency, so that the quick heating of the drying area can be realized, and the system drying efficiency is improved.
Based on the foregoing, as an optional embodiment, the method further includes: and under the condition that the temperature difference between the target set temperature and the return air inlet temperature is larger than the second threshold value and not larger than the first threshold value, controlling the heating device to stop running, and controlling the compressor to run at the maximum running frequency.
Specifically, the second threshold described in the embodiment of the present invention refers to a preset temperature difference threshold, and the value range of the second threshold may be 9 ℃ to 11 ℃. Which may be indicative that the target set temperature and return air inlet temperature are already at a relatively close level. Alternatively, in an embodiment of the present invention, the second threshold may take on a value of 10 ℃.
In the embodiment of the invention, when the temperature difference between the target set temperature and the return air inlet temperature is larger than the first threshold value, the heating device is controlled to be started, and the compressor is controlled to operate at the maximum operating frequency. Along with the continuous rising of the temperature of the air return opening, the temperature difference between the target set temperature and the temperature of the air return opening gradually reduces, and if the temperature difference between the target set temperature and the temperature of the air return opening is determined to be larger than a second threshold value and not larger than a first threshold value, the air return opening temperature of the drying area is indicated to be at a relatively approximate level with the target set temperature, at the moment, the heating device can be controlled to stop running, and the compressor is controlled to keep the maximum running frequency to run.
Alternatively, in a specific embodiment, the second threshold may be 10℃and the first threshold may be 20℃when the target set temperature TC m The temperature difference between the air inlet and the air return inlet temperature TC is less than 10 DEG C m The TC is less than or equal to 20 ℃, the heating device can be controlled to stop running, and the compressor is controlled to run at the maximum running frequency.
According to the method provided by the embodiment of the invention, under the condition that the temperature difference between the target set temperature and the temperature of the return air inlet is larger than the second threshold value and is not larger than the first threshold value, the heating device is controlled to stop running, the compressor is controlled to run at the maximum running frequency, and the energy consumption of the system can be effectively reduced while the drying efficiency of the system is ensured.
Based on the foregoing, as an optional embodiment, the method further includes: and under the condition that the temperature difference between the target set temperature and the return air inlet temperature is greater than zero and not greater than a second threshold value, controlling the compressor to operate based on a first operating frequency and a first control mode, wherein the first operating frequency is obtained by subtracting the first frequency threshold value from the maximum operating frequency of the compressor.
Specifically, the first frequency threshold described in the embodiments of the present invention refers to a preset frequency threshold, which may be flexibly set according to actual design requirements, for example, the value range of the first frequency threshold may be 4Hz to 6Hz.
The first operating frequency described in the embodiments of the present invention is obtained by subtracting the first frequency threshold from the maximum operating frequency of the compressor, that is, if the first frequency threshold assumes a value of 5Hz, the first operating frequency f 1 =fmax-5, where fmax represents the maximum operating frequency of the compressor.
The first control mode described in the embodiments of the present invention refers to a control mode for adjusting the operation frequency of the compressor based on the trend of the change in the return air inlet temperature, which may be represented as intermittently increasing the operation frequency of the compressor.
Further, in the embodiment of the invention, when the temperature difference between the target set temperature and the return air inlet temperature is greater than zero and not greater than the second threshold value, it is indicated that the target set temperature and the return air inlet temperature are already at a relatively close level, and the compressor can be controlled to operate in a first control mode based on the first operating frequency as the initial operating frequency of the compressor, so as to realize fine control of the compressor in the heat pump dryer.
According to the method provided by the embodiment of the invention, under the condition that the temperature difference between the target set temperature and the air return temperature is determined to be greater than zero and not greater than the second threshold, namely the target set temperature and the air return temperature are determined to be at a relatively approximate level, the first control mode is invoked, so that the fine control of the compressor is realized, and the drying efficiency of the system is improved.
Based on the foregoing embodiments, as an alternative embodiment, controlling the compressor to operate based on the first operating frequency and the first control mode includes:
under the condition that the change trend of the temperature of the return air inlet is gradually increased in the previous operation period, controlling the compressor to maintain the operation frequency corresponding to the previous operation period to operate in the current operation period; under the condition that the temperature difference between the target set temperature and the return air inlet temperature is greater than zero and not greater than a second threshold value, the corresponding operation frequency of the first operation period is the first operation frequency;
and under the condition that the change trend of the temperature of the return air inlet is not gradually increased in the previous operation period, controlling the compressor to operate based on a second operation frequency in the current operation period, wherein the second operation frequency is obtained by increasing a second frequency threshold value based on the operation frequency corresponding to the previous operation period.
Specifically, the operation period described in the embodiment of the present invention refers to a preset operation period of the compressor, which may be specifically designed according to actual requirements, for example, one operation period may be set every 1 minute, or one operation period may be set every 2 minutes.
The second frequency threshold described in the embodiment of the present invention refers to a preset frequency threshold, and a specific value of the second frequency threshold may be flexibly set according to actual needs, for example, a value range of the second frequency threshold may be 1Hz to 3Hz.
The second operating frequency described in the embodiment of the present invention is obtained by increasing the second frequency threshold based on the operating frequency corresponding to the previous operating period, that is, assuming that the second frequency threshold can take a value of 1Hz, the second operating frequency f 2 =f+1, where f represents the operating frequency of the compressor in the last operating cycle.
In the embodiment of the invention, when the temperature difference between the target set temperature and the return air inlet temperature is determined to be greater than zero and not greater than a second threshold, namely, the target set temperature and the return air inlet temperature are at a relatively close level, the running period is divided in advance on the running time of the compressor, and the change trend of the return air inlet temperature is detected on each running period of the compressor, so that the running of the compressor is finely controlled according to the change trend of the return air inlet temperature on each running period.
It should be noted that, when the temperature difference between the target set temperature and the return air inlet temperature is greater than zero and not greater than the second threshold value, the operation frequency corresponding to the first operation period is the first operation frequency, that is, the compressor is operated at the first operation frequency in the first operation period.
Further, in the embodiment of the present invention, the trend of the change of the return air inlet temperature is detected in each operation period of the compressor, and if the trend of the change of the return air inlet temperature is gradually raised in the previous operation period, the compressor is controlled to maintain the operation frequency corresponding to the previous operation period to operate in the current operation period. For example, upon determining that the trend of the return air inlet temperature change is increasing in steps during a first operating cycle, it may be determined to control the compressor to maintain operation at the first operating frequency during a second operating cycle.
And if the change trend of the temperature of the return air inlet is not gradually increased in the previous operation period, controlling the compressor to operate based on the second operation frequency in the current operation period. For example, when it is determined that the trend of the change in the return air inlet temperature is not increasing in steps during the first operation period, it may be determined that the compressor is controlled to operate based on a second operation frequency during a second operation period, where the second operation frequency is the first operation frequency plus a second frequency threshold.
And so on, according to the mode, the operation frequency of the compressor in a plurality of continuous cycle times such as a third operation cycle, a fourth operation cycle, a fifth operation cycle and the like under the condition that the temperature difference between the target set temperature and the return air inlet temperature is larger than zero and not larger than a second threshold value can be sequentially determined.
In the embodiment of the invention, under the condition that the temperature difference between the target set temperature and the return air inlet temperature is determined to be greater than zero and not greater than a second threshold value, the running frequency of the compressor in each running period can be determined by judging the change trend of the return air inlet temperature in each running period of the compressor, and the compressor is finely controlled until the temperature difference between the target set temperature and the return air inlet temperature is not greater than zero.
Alternatively, in one embodiment of the present invention, the second threshold may be 10℃and the first frequency threshold may be 5Hz, the first operating frequency f 1 When the temperature difference between the target set temperature TCm and the return air inlet temperature TC satisfies 0 < TCm-TC less than or equal to 10 ℃, the compressor is controlled to operate at a first operating frequency f 1 ＝f max -5 operating as an initial operating frequency, and then determining a trend of temperature change of TC with one operation cycle of the compressor every 1 minute, and setting a temperature change Δt=t of TC 1 -t 0 ，t 1 Indicating the return air inlet temperature at the end of the 1 minute operation period, t 0 The return air inlet temperature at the beginning of 1 minute is shown;
if delta t is more than 0, the change trend of the temperature of the air return opening is gradually increased, and the compressor is controlled to operate at the corresponding operating frequency in the last operating period in the current operating period;
if delta t is less than or equal to 0, the change trend of the temperature of the air return opening is not gradually increased, and the compressor is controlled to be at the second operating frequency f in the current operating period 2 =f+1 operation, where f represents the corresponding operating frequency in the last operating cycle.
According to the method provided by the embodiment of the invention, when the temperature difference between the target set temperature and the return air inlet temperature is determined to be greater than zero and not greater than the second threshold value, namely, the target set temperature and the return air inlet temperature are determined to be in a relatively close level, the running frequency of the compressor is gradually increased according to the change trend of the return air inlet temperature by continuously detecting the change trend of the return air inlet temperature in the running period, so that the running frequency of the compressor is finely adjusted, the drying efficiency of the system can be effectively improved, and the running energy consumption of the system is reduced.
Based on the foregoing, as an optional embodiment, the method further includes:
And under the condition that the temperature difference between the target set temperature and the return air inlet temperature is not greater than zero, controlling the compressor to operate based on the current operating frequency and the second control mode, wherein the current operating frequency is obtained by subtracting a third frequency threshold value from the operating frequency corresponding to the previous operating period.
Specifically, the current operating frequency described in the embodiment of the present invention refers to the operating frequency of the compressor when the temperature difference between the target set temperature and the return air inlet temperature is not greater than zero.
It should be understood that the last operation cycle at this time refers to the last operation cycle at the time corresponding to when the temperature difference between the target set temperature and the return air inlet temperature is not greater than zero, which may also be understood as the last operation cycle of each divided operation cycle of the compressor in the above embodiment when the temperature difference between the target set temperature and the return air inlet temperature is greater than zero and not greater than the second threshold.
The third frequency threshold described in the embodiment of the present invention refers to a preset frequency threshold, which can be flexibly set according to actual design requirements, for example, the value range of the third frequency threshold may be 1Hz to 3Hz.
The current operating frequency described in the embodiment of the present invention is obtained by subtracting the third frequency threshold from the operating frequency corresponding to the previous operating period, that is, if the third frequency threshold is 2Hz, the current operating frequency f=f 0 -2, wherein f 0 Representing the last run periodThe corresponding operating frequency, namely the operating frequency corresponding to the last operating period at the moment when the temperature difference between the target set temperature and the return air inlet temperature is not more than zero.
The second control mode described in the embodiments of the present invention is also a control mode for adjusting the operating frequency of the compressor based on the trend of the return air inlet temperature, and may be represented as intermittently reducing the operating frequency of the compressor.
Further, in the embodiment of the present invention, when the temperature difference between the target set temperature and the return air inlet temperature is not greater than zero, it is indicated that the target set temperature is the same as the return air inlet temperature of the drying chamber, or the return air inlet temperature is higher than the target set temperature, and the compressor may be controlled to operate in the second control mode based on the current operating frequency as the initial operating frequency of the compressor, so as to further perform fine control on the compressor in the heat pump dryer.
According to the method provided by the embodiment of the invention, under the condition that the temperature difference between the target set temperature and the temperature of the return air inlet is not more than zero, namely that the temperature of the return air inlet in the drying chamber reaches or exceeds the target set temperature, the second control mode is called, so that the fine control of the compressor is realized, and the drying efficiency of the system is improved.
Based on the foregoing embodiment, as an alternative embodiment, controlling the compressor to operate based on the current operating frequency and the second control mode includes:
under the condition that the change trend of the temperature of the return air inlet is gradually increased in the previous operation period, controlling the compressor to operate based on a third operation frequency in the current operation period, wherein the third operation frequency is obtained by subtracting a fourth frequency threshold value from the operation frequency corresponding to the previous operation period; under the condition that the temperature difference between the target set temperature and the return air inlet temperature is not more than zero, the corresponding operation frequency of the first operation period is the current operation frequency;
and under the condition that the change trend of the temperature of the return air inlet is not gradually increased in the previous operation period, controlling the compressor to maintain the operation frequency corresponding to the previous operation period to operate in the current operation period.
Specifically, the fourth frequency threshold described in the embodiment of the present invention refers to a preset frequency threshold, and a specific value of the fourth frequency threshold may be flexibly set according to actual needs, for example, a value range of the fourth frequency threshold may be 1Hz to 3Hz.
The third operating frequency described in the embodiment of the present invention is obtained by subtracting the fourth frequency threshold from the operating frequency corresponding to the previous operating period, that is, assuming that the fourth frequency threshold may take a value of 2Hz, the third operating frequency f 3 =f-2, where f represents the operating frequency of the compressor in the last operating cycle.
In the embodiment of the invention, when the temperature difference between the target set temperature and the return air inlet temperature is not more than zero, namely the return air inlet temperature reaches or exceeds the target set temperature, the operation of the compressor can be finely controlled according to the change trend of the return air inlet temperature in each operation period by detecting the change trend of the return air inlet temperature in each operation period of the compressor.
It should be noted that, when the temperature difference between the target set temperature and the return air inlet temperature is not greater than zero, the operation frequency corresponding to the first operation period is the current operation frequency, that is, at this time, the compressor is operated at the current operation frequency, that is, the operation frequency of the compressor when the temperature difference between the target set temperature and the return air inlet temperature is not greater than zero.
Further, in the embodiment of the present invention, when the temperature difference between the target set temperature and the return air inlet temperature is not greater than zero, the trend of the change of the return air inlet temperature is detected in each operation period of the compressor, and if the trend of the change of the return air inlet temperature is gradually increased in the previous operation period, the compressor is controlled to operate based on the third operation frequency in the current operation period.
For example, when it is determined that the trend of the change in the return air inlet temperature is gradually increased in the first operation period, it may be determined that the compressor is controlled to operate at a third operation frequency in the second operation period, where the third operation frequency is the current operation frequency minus a fourth frequency threshold.
If the change trend of the temperature of the return air inlet is not gradually increased in the previous operation period, controlling the compressor to maintain the operation frequency corresponding to the previous operation period to operate in the current operation period. For example, when it is determined that the trend of the change in the return air inlet temperature is not gradually increased in the first operation period, it may be determined that the compressor is controlled to maintain the operation at the corresponding operation frequency in the first operation period in the second operation period, that is, the compressor is controlled to maintain the operation at the current operation frequency in the second operation period.
And so on, according to the mode, the operation frequency of the compressor in a plurality of continuous cycle times such as a third operation cycle, a fourth operation cycle, a fifth operation cycle and the like can be sequentially determined under the condition that the temperature difference between the target set temperature and the return air inlet temperature is not more than zero.
Alternatively, in a specific embodiment of the present invention, the third frequency threshold may be 2Hz, the fourth frequency threshold may be 2Hz, and the third operating frequency f 3 =f-2, F denotes the operating frequency of the compressor in the last operating cycle, the current operating frequency f=f 0 -2, when the target set temperature TC m The temperature difference between the air inlet temperature TC and the return air inlet temperature TC meets TC m When TC is equal to or less than 0, the compressor is first controlled to operate at the current operating frequency F as an initial operating frequency, and then, the trend of temperature change of TC is determined with one operating cycle of the compressor every 1 minute, and the temperature change of TC is Δt=t 1 -t 0 ，t 1 Indicating the return air inlet temperature at the end of the 1 minute operation period, t 0 The return air inlet temperature at the beginning of 1 minute is shown;
if delta t is more than 0, the change trend of the temperature of the air return opening is gradually increased, and at the moment, the compressor is controlled to be controlled according to the third operating frequency f in the current operating period 3 =f-2 runs;
if delta t is less than or equal to 0, the change trend of the temperature of the air return opening is not gradually increased, and the current operation period is used for controlling the compressor to maintain the operation of the corresponding operation frequency in the previous operation period.
According to the method provided by the embodiment of the invention, when the temperature difference between the target set temperature and the return air inlet temperature is not more than zero, namely the return air inlet temperature is determined to reach or exceed the target set temperature, the running frequency of the compressor is gradually regulated down according to the change trend of the return air inlet temperature by continuously detecting the change trend of the return air inlet temperature in the running period of the compressor, so that the over-high return air inlet temperature is prevented, the energy consumption is reduced, the running frequency of the compressor is finely regulated, the drying efficiency of a system can be further improved, and the running energy consumption of the system is reduced.
In a specific embodiment of the invention, the temperature and humidity parameters of the air return port temperature TC and the air return port humidity RH of the air return port of the drying area are taken as control targets, the target set temperature can be set to be TCm, the target humidity threshold can be 30%, and the heating device adopts an electric heating device;
when TCm-TC is determined to be more than 20 ℃, the electric heating device is started, and the operation frequency f=fmax of the compressor is controlled, namely, the compressor is operated at the maximum operation frequency;
at a temperature of determined to be less than TC 10 DEG C m -at TC less than or equal to 20 ℃, turning off the electric heating device, controlling the compressor to operate at a maximum operating frequency f=fmax;
in determining 0 < TC m Controlling the compressor to operate at a first frequency f under the condition that TC is less than or equal to 10 DEG C 1 ＝f max -5, and then determining the trend of the temperature change of TC at a cycle time interval of 1 minute, with Δt=t 1 -t 0 ，t 1 The return air inlet temperature at the end of 1 minute in a period time interval is represented by t 0 The return air inlet temperature at the beginning of 1 minute is shown;
if delta t is more than 0, controlling the compressor to maintain the operation frequency corresponding to the last operation period unchanged;
if delta t is less than or equal to 0, the operation frequency of the compressor at the moment is increased, and the compressor is controlled to be in accordance with the second operation frequency f 2 =f+1 operation, where f represents the operation frequency corresponding to the last operation cycle;
At the determination of TC m -controlling the compressor to be currently operated in case TC is less than or equal to 0The line frequency f=f0-2 is operated, and then, the temperature change trend of TC is judged at a cycle time interval of 1 minute, and delta t=t is set 1 -t 0 ，t 1 The return air inlet temperature at the end of 1 minute in a period time interval is represented by t 0 The return air inlet temperature at the beginning of 1 minute is shown;
if delta t is more than 0, continuing to lower the frequency of the compressor, and controlling the compressor to operate according to the third operating frequency f 3 =f-2 operation, where f represents the operation frequency corresponding to the last operation cycle;
if delta t is less than or equal to 0, controlling the compressor to maintain the operation frequency corresponding to the last operation period unchanged.
When the temperature of TCm-TC is less than or equal to minus 2 ℃ and less than or equal to 2 ℃, the humidity of the return air inlet is judged, if RH is detected to be less than 30% after 3 minutes, the dried object is dried, and the heat pump compressor can be controlled to stop heating.
The heat pump dryer control device provided by the invention is described below, and the heat pump dryer control device described below and the heat pump dryer control method described above can be referred to correspondingly.
Fig. 3 is a schematic structural diagram of a heat pump dryer control device according to the present invention, as shown in fig. 3, including:
The first control module 310 is configured to control, when the heat pump dryer heats, the operation of the compressor based on a temperature difference between a target set temperature and a return air inlet temperature, and control the start and stop of the heating device to adjust the rise of the return air inlet temperature;
and the second control module 320 is configured to control the heat pump dryer to stop heating when it is determined that the absolute value of the temperature difference is less than the target temperature threshold and the air return inlet humidity is continuously less than the target humidity threshold within the target time period.
The heat pump dryer control device in this embodiment may be used to execute the above embodiment of the heat pump dryer control method, and its principle and technical effects are similar, and are not described herein again.
According to the heat pump dryer control device, the temperature sensor and the humidity sensor are added to the air return port, so that the operation of the compressor is finely controlled based on the temperature difference between the target set temperature and the detected air return port temperature under the condition that the heat pump dryer heats, and the heating device is additionally arranged to control the starting and stopping of the heating device to assist in heating, so that the rising rate of the temperature of the air return port is regulated, and the drying efficiency is improved; under the condition that the absolute value of the temperature difference between the target set temperature and the air return temperature is smaller than the target temperature threshold value and the air return humidity in the target duration is continuously smaller than the target humidity threshold value, the object can be accurately judged to be dried, and then the heat pump dryer can be controlled to stop heating. Through real-time detection return air inlet temperature and return air inlet humidity, can accurately judge the stoving state of object to carry out fine control to compressor and heating device according to different stoving states, reach the purpose of accurate control by the dryness fraction of stoving thing, when promoting drying efficiency, also reduced the system energy consumption, promoted the energy-conserving emission reduction's of system efficiency.
Fig. 4 is a schematic structural diagram of a controller in a heat pump dryer according to the present invention, and as shown in fig. 4, the electronic device may include: processor 410, communication interface (Communications Interface) 420, memory 430 and communication bus 440, wherein processor 410, communication interface 420 and memory 430 communicate with each other via communication bus 440. Processor 410 may invoke logic instructions in memory 430 to perform the heat pump dryer control method provided by the methods described above, including: under the condition that the heat pump dryer heats, controlling the operation of a compressor based on the temperature difference between the target set temperature and the temperature of the return air inlet, and controlling the starting and stopping of a heating device so as to adjust the temperature rise of the return air inlet; and under the condition that the absolute value of the temperature difference is smaller than the target temperature threshold value and the humidity of the return air inlet in the target duration is continuously smaller than the target humidity threshold value, controlling the heat pump dryer to stop heating.
Further, the logic instructions in the memory 430 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, the computer program product including a computer program, the computer program being storable on a non-transitory computer readable storage medium, the computer program, when executed by a processor, being capable of executing the heat pump dryer control method provided by the above methods, the method comprising: under the condition that the heat pump dryer heats, controlling the operation of a compressor based on the temperature difference between the target set temperature and the temperature of the return air inlet, and controlling the starting and stopping of a heating device so as to adjust the temperature rise of the return air inlet; and under the condition that the absolute value of the temperature difference is smaller than the target temperature threshold value and the humidity of the return air inlet in the target duration is continuously smaller than the target humidity threshold value, controlling the heat pump dryer to stop heating.
In yet another aspect, the present invention also 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 heat pump dryer control method provided by the above methods, the method comprising: under the condition that the heat pump dryer heats, controlling the operation of a compressor based on the temperature difference between the target set temperature and the temperature of the return air inlet, and controlling the starting and stopping of a heating device so as to adjust the temperature rise of the return air inlet; and under the condition that the absolute value of the temperature difference is smaller than the target temperature threshold value and the humidity of the return air inlet in the target duration is continuously smaller than the target humidity threshold value, controlling the heat pump dryer to stop heating.
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 (7)
1. A heat pump dryer control method, comprising:
under the condition that the heat pump dryer heats, controlling the operation of a compressor based on the temperature difference between the target set temperature and the temperature of the return air inlet, and controlling the starting and stopping of a heating device so as to adjust the temperature rise of the return air inlet;
controlling the heat pump dryer to stop heating under the condition that the absolute value of the temperature difference is smaller than a target temperature threshold value and the humidity of the return air inlet in a target duration is continuously smaller than a target humidity threshold value;
the temperature difference based on the target set temperature and the return air inlet temperature controls the operation of the compressor and controls the starting and stopping of the heating device, and the method comprises the following steps:
Controlling the heating device to start and controlling the compressor to operate at the maximum operating frequency under the condition that the temperature difference between the target set temperature and the return air inlet temperature is larger than a first threshold value;
controlling the heating device to stop running and controlling the compressor to run at the maximum running frequency under the condition that the temperature difference between the target set temperature and the return air inlet temperature is larger than a second threshold value and not larger than the first threshold value;
controlling the compressor to operate based on a first operating frequency and a first control mode when the temperature difference between the target set temperature and the return air inlet temperature is greater than zero and not greater than the second threshold, wherein the first operating frequency is obtained by subtracting a first frequency threshold from the maximum operating frequency of the compressor, and the first control mode is to intermittently increase the operating frequency of the compressor;
and under the condition that the temperature difference between the target set temperature and the return air inlet temperature is not greater than zero, controlling the compressor to operate based on the current operating frequency and a second control mode, wherein the current operating frequency is obtained by subtracting a third frequency threshold value from the operating frequency corresponding to the previous operating period, and the second control mode is to intermittently reduce the operating frequency of the compressor.
2. The heat pump dryer control method of claim 1, wherein the controlling the compressor to operate based on a first operating frequency and a first control mode includes:
under the condition that the change trend of the temperature of the return air inlet is gradually increased in the previous operation period, controlling the compressor to maintain the operation frequency corresponding to the previous operation period to operate in the current operation period; wherein, under the condition that the temperature difference between the target set temperature and the return air inlet temperature is greater than zero and not greater than the second threshold value, the corresponding operation frequency of the corresponding first operation period is the first operation frequency;
and under the condition that the change trend of the temperature of the return air inlet is not gradually increased in the previous operation period, controlling the compressor to operate based on a second operation frequency in the current operation period, wherein the second operation frequency is obtained by increasing a second frequency threshold value based on the operation frequency corresponding to the previous operation period.
3. The heat pump dryer control method of claim 1, wherein the controlling the compressor to operate based on a current operating frequency and a second control mode includes:
Under the condition that the change trend of the temperature of the return air inlet is gradually increased in the previous operation period, controlling the compressor to operate based on a third operation frequency in the current operation period, wherein the third operation frequency is obtained by subtracting a fourth frequency threshold value from the operation frequency corresponding to the previous operation period; wherein, under the condition that the temperature difference between the target set temperature and the return air inlet temperature is not more than zero, the corresponding operation frequency of the first operation period is the current operation frequency;
and under the condition that the change trend of the temperature of the return air inlet is not gradually increased in the previous operation period, controlling the compressor to maintain the operation frequency corresponding to the previous operation period to operate in the current operation period.
4. A heat pump dryer control apparatus, comprising:
the first control module is used for controlling the operation of the compressor based on the temperature difference between the target set temperature and the temperature of the return air inlet under the condition that the heat pump dryer heats, and controlling the starting and stopping of the heating device so as to adjust the temperature rise of the return air inlet;
the second control module is used for controlling the heat pump dryer to stop heating under the condition that the absolute value of the temperature difference is smaller than a target temperature threshold value and the humidity of the return air inlet in the target duration is continuously smaller than the target humidity threshold value;
The temperature difference based on the target set temperature and the return air inlet temperature controls the operation of the compressor and controls the starting and stopping of the heating device, and the method comprises the following steps:
controlling the heating device to start and controlling the compressor to operate at the maximum operating frequency under the condition that the temperature difference between the target set temperature and the return air inlet temperature is larger than a first threshold value;
controlling the heating device to stop running and controlling the compressor to run at the maximum running frequency under the condition that the temperature difference between the target set temperature and the return air inlet temperature is larger than a second threshold value and not larger than the first threshold value;
controlling the compressor to operate based on a first operating frequency and a first control mode when the temperature difference between the target set temperature and the return air inlet temperature is greater than zero and not greater than the second threshold, wherein the first operating frequency is obtained by subtracting a first frequency threshold from the maximum operating frequency of the compressor, and the first control mode is to intermittently increase the operating frequency of the compressor;
and under the condition that the temperature difference between the target set temperature and the return air inlet temperature is not greater than zero, controlling the compressor to operate based on the current operating frequency and a second control mode, wherein the current operating frequency is obtained by subtracting a third frequency threshold value from the operating frequency corresponding to the previous operating period, and the second control mode is to intermittently reduce the operating frequency of the compressor.
5. A heat pump dryer, comprising:
the dryer comprises a dryer body, an evaporator, a compressor, a condenser, a dehumidifier, a fresh air valve, an air outlet fan and a heating device;
the evaporator, the compressor, the condenser, the dehumidifier, the fresh air valve, the air outlet fan and the heating device are all arranged in the dryer body, and the heating device is arranged between the condenser and the air outlet fan;
further comprises: a controller, a temperature sensor and a humidity sensor;
the heating device, the temperature sensor and the humidity sensor are all electrically connected with the controller; the temperature sensor and the humidity sensor are both arranged at the air return opening; the temperature sensor is used for obtaining the temperature of the retrieving air opening, and the humidity sensor is used for obtaining the humidity of the retrieving air opening;
wherein the controller comprises a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the heat pump dryer control method according to any one of claims 1 to 3 when executing the program.
6. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the heat pump dryer control method according to any one of claims 1 to 3.
7. A computer program product comprising a computer program, characterized in that the computer program, when executed by a processor, implements a heat pump dryer control method as claimed in any one of claims 1 to 3.
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| CN212414684U (en) * | 2020-06-12 | 2021-01-29 | 洛阳双瑞特种装备有限公司 | Energy-saving tobacco drying system |
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