CN115523750A - Heat pump dryer control method and device based on air inlet temperature - Google Patents
Heat pump dryer control method and device based on air inlet temperature Download PDFInfo
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- 238000007791 dehumidification Methods 0.000 claims description 3
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
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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
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Abstract
The invention provides a heat pump dryer control method and device based on air inlet temperature, and relates to the technical field of heat pump dryers, wherein the method comprises the following steps: acquiring humidity variable quantities of an air inlet and an air return inlet of a drying chamber of the heat pump dryer; determining a target set temperature according to the humidity change amount under the condition that the humidity change amount is larger than a first humidity threshold value; acquiring the temperature of the air inlet, and calculating the temperature difference between the target set temperature and the temperature of the air inlet; and adjusting the working frequency of a compressor in the heat pump dryer according to the temperature difference until the humidity variation is less than or equal to a first humidity threshold value, and controlling the compressor to stop working. The technical scheme provided by the invention can accurately control the dryness of the dried object, improve the drying efficiency of the heat pump dryer and reduce the energy consumption.
Description
Technical Field
The invention relates to the technical field of heat pump dryers, in particular to a heat pump dryer control method and device based on air inlet temperature.
Background
The heat pump dryer is a heat lifting device, and can be applied to the drying and dehydration processes of food, medicinal materials, wood, agricultural and sideline products, industrial products and the like.
The heat pump dryer mainly uses condensation heat to heat and dehumidify objects, fig. 1 shows a schematic diagram of a working principle of a heat pump dryer system, the heat pump dryer system may include an evaporator (external unit), a heat pump compressor, a condenser (internal unit), an expansion valve, a controller, etc., during drying, a thermodynamic cycle process of "evaporation → compression → condensation → throttling → re-evaporation" is continuously repeated in the system by a refrigerant, heat released in the thermodynamic cycle process can be continuously transferred to a drying area, and continuous drying of materials to be dried in the drying area is realized. However, the existing heat pump dryer cannot accurately determine whether the dryness of the dried object meets the target requirement, and high energy consumption is easily generated in the drying process, so how to better control the heat pump dryer has important significance in improving drying efficiency, reducing energy consumption and the like, and becomes a technical problem to be solved urgently in the industry.
Disclosure of Invention
The invention provides a heat pump dryer control method and device based on air inlet temperature, which are used for solving the defect that a heat pump dryer in the prior art cannot accurately judge whether the dryness of a dried object meets the target requirement and is easy to generate high energy consumption, realizing the optimization of heat pump dryer control logic, improving drying efficiency and reducing energy consumption.
The invention provides a heat pump dryer control method based on air inlet temperature, which comprises the following steps:
acquiring humidity variable quantities of an air inlet and an air return inlet of a drying chamber of the heat pump dryer;
determining a target set temperature according to the humidity change amount under the condition that the humidity change amount is larger than a first humidity threshold value;
acquiring the temperature of an air inlet, and calculating the temperature difference between the target set temperature and the temperature of the air inlet;
and adjusting the working frequency of a compressor in the heat pump dryer according to the temperature difference until the humidity variation is less than or equal to the first humidity threshold value, and controlling the compressor to stop working.
According to the heat pump dryer control method based on the temperature of the air inlet provided by the invention, the adjusting of the working frequency of the compressor in the heat pump dryer according to the temperature difference comprises the following steps:
and under the condition that the temperature difference is greater than a first temperature difference threshold value, controlling the working frequency of the compressor to be kept at the maximum working frequency of the compressor until the temperature difference is less than or equal to the first temperature difference threshold value.
The heat pump dryer control method based on the temperature of the air inlet further comprises the following steps:
determining an initial frequency based on the temperature difference if the temperature difference is greater than a second temperature difference threshold and less than or equal to the first temperature difference threshold;
adjusting the working frequency of the compressor to the initial frequency, and acquiring the temperature variation of the air inlet once every other first set time period;
and adjusting the working frequency of the compressor based on the temperature variation until the temperature difference is less than or equal to the second temperature difference threshold value.
According to the heat pump dryer control method based on the temperature of the air inlet, the determining of the initial frequency based on the temperature difference comprises the following steps:
determining a frequency difference between a maximum working frequency of the compressor and a preset frequency as the initial frequency when the temperature difference is greater than a third temperature difference threshold and less than or equal to the first temperature difference threshold, wherein the third temperature difference threshold is greater than the second temperature difference threshold;
the adjusting the operating frequency of the compressor based on the amount of temperature change includes:
controlling the working frequency of the compressor to be kept at the current working frequency in response to the temperature variation being larger than a first threshold value;
in response to the amount of temperature change being less than or equal to the first threshold, increasing the operating frequency of the compressor by a first frequency magnitude.
According to the heat pump dryer control method based on the temperature of the air inlet, the determining of the initial frequency based on the temperature difference comprises the following steps:
determining the current working frequency of the compressor as the initial frequency under the condition that the temperature difference is greater than the second temperature difference threshold and less than or equal to a third temperature difference threshold, wherein the third temperature difference threshold is less than the first temperature difference threshold;
the adjusting the operating frequency of the compressor based on the temperature variation includes:
in response to the temperature change amount being greater than a second threshold, decreasing the operating frequency of the compressor by a second frequency magnitude;
in response to the amount of temperature change being less than or equal to the second threshold, increasing the operating frequency of the compressor by a second frequency amplitude.
According to the heat pump dryer control method based on the temperature of the air inlet, the method further comprises the following steps:
and under the condition that the temperature difference is less than or equal to the second temperature difference threshold value, reducing the working frequency of the compressor by a third frequency amplitude, and acquiring the temperature difference between the target set temperature and the air inlet temperature once every second set time period until the temperature difference is greater than the second temperature difference threshold value.
According to the heat pump dryer control method based on the temperature of the air inlet provided by the invention, under the condition that the humidity variation is larger than the first humidity threshold, the target set temperature is determined according to the humidity variation, and the method comprises the following steps:
determining that the target set temperature is a first temperature under the condition that the humidity change amount is larger than a first humidity threshold and smaller than or equal to a second humidity threshold;
and under the condition that the humidity change amount is larger than the second humidity threshold value, determining that the target set temperature is the maximum rated temperature of the drying chamber of the heat pump dryer, wherein the first temperature is smaller than the maximum rated temperature.
The invention also provides a heat pump dryer control device based on the temperature of the air inlet, which comprises:
the acquisition module is used for acquiring humidity variable quantities of an air inlet and an air return inlet of the heat pump dryer;
the determining module is used for determining a target set temperature according to the humidity change under the condition that the humidity change is larger than a first humidity threshold;
the calculating module is used for acquiring the temperature of an air inlet of the heat pump dryer and calculating the temperature difference between the target set temperature and the temperature of the air inlet;
and the control module is used for adjusting the working frequency of a compressor of the heat pump dryer according to the temperature difference until the humidity variation is less than or equal to the first humidity threshold value, and controlling the compressor to stop working.
The invention also provides a heat pump dryer, which comprises an evaporator, a compressor, a condenser, a dehumidifier, a first expansion valve and a second expansion valve; the compressor, the condenser, the first expansion valve and the dehumidifier are sequentially connected to form a dehumidification thermodynamic loop, and the evaporator, the compressor, the condenser and the second expansion valve are sequentially connected to form a drying thermodynamic loop;
further comprising: the device comprises a first temperature sensor, a first humidity sensor, a second temperature sensor, a second humidity sensor and a controller;
the first temperature sensor and the first humidity sensor are arranged at an air inlet of a drying chamber of the heat pump dryer, are respectively and electrically connected with the controller and are respectively used for collecting the temperature of the air inlet and the humidity of the air inlet;
the second temperature sensor and the second humidity sensor are arranged at an air return port of the drying chamber of the heat pump dryer, are respectively and electrically connected with the controller and are respectively used for collecting the temperature and the humidity of the air return port;
the controller comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, and the processor executes the computer program to realize the heat pump dryer control method based on the air inlet temperature.
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 based on air intake temperature as described in any of the above.
The present invention also provides a computer program product comprising a computer program, wherein the computer program, when executed by a processor, implements the heat pump dryer control method based on the air inlet temperature as described in any of the above.
According to the heat pump dryer control method and device based on the temperature of the air inlet, whether the humidity degree of the dried object meets the drying target requirement can be judged according to whether the humidity variation of the air inlet and the air return inlet of the drying chamber is larger than a first humidity threshold, when the humidity variation is larger than the first humidity threshold, the drying target requirement is not met, the drying temperature needs to be controlled, the target set temperature required by the dried object in the current state is determined based on the humidity variation, the working frequency of the compressor is adjusted by using the temperature difference between the target set temperature and the temperature of the air inlet, the fine control of the working frequency of the compressor can be realized, the compressor works in a better state, the drying heat required by the dried object in the current state is provided for the drying chamber, the accurate control of the temperature of the drying chamber is realized, the drying efficiency is improved, and the energy consumption is reduced; the adjustment process can be repeatedly executed until the humidity variation is smaller than or equal to the first humidity threshold value, the moisture in the dried object can be accurately judged to meet the target requirement, and at the moment, the compressor can be controlled to stop working, so that transitional drying and unnecessary energy consumption are avoided. Based on the method and the device, whether the dryness of the dried object meets the target requirement can be accurately judged, the fine control of the working frequency of a compressor in the heat pump dryer is realized, the control logic of the heat pump dryer is optimized, the drying efficiency of the heat pump dryer is improved, and the energy consumption is reduced.
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In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic representation of the operating principle of a prior art heat pump dryer system;
fig. 2 is a schematic structural view of a heat pump dryer provided in the present invention;
FIG. 3 is a schematic flow chart of a heat pump dryer control method based on air inlet temperature according to the present invention;
fig. 4 is a schematic structural diagram of a heat pump dryer control device based on air inlet temperature according to the present invention;
fig. 5 is a schematic structural diagram of a controller in a heat pump dryer according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 2 illustrates a schematic structural diagram 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 expansion valve 206, a second expansion valve 207, a first temperature sensor 208, a second temperature sensor 209, a first humidity sensor 210, a second humidity sensor 211, and a controller 212. Wherein, the compressor 202, the condenser 203, the first expansion valve 206 and the dehumidifier 204 are connected in sequence to form a 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. The first temperature sensor 208 and the first humidity sensor 210 are disposed at the air inlet 10 of the drying chamber, and are electrically connected to the controller 212, respectively, for collecting the air inlet temperature and the air inlet humidity, respectively; the second temperature sensor 209 and the second humidity sensor 211 are disposed at the air return opening 20 of the drying chamber, and are electrically connected to the controller 212, respectively, for collecting the air return opening temperature and the air return opening humidity, respectively. The controller 212 is electrically connected to the evaporator 201, the compressor 202, the condenser 203, the dehumidifier 204, the electric heater 205, the first expansion valve 206, and the second expansion valve 207, respectively, for controlling the operations of these components. Based on this, when the heat pump dryer heats, the refrigerant can repeat the thermodynamic cycle process of evaporation, compression, condensation, throttling and re-evaporation continuously, and meanwhile, the heat released in the thermodynamic cycle process is transferred into the drying chamber continuously, so as to heat and dehumidify the dried object in the drying chamber continuously until the dried object is dried. In an embodiment of the present invention, the controller 212 may be configured to: calculating humidity variation of an air inlet 10 and an air return inlet 20 of the drying chamber according to the air inlet temperature, the air inlet humidity, the air return inlet temperature and the air return inlet humidity; determining a target set temperature according to the humidity change amount under the condition that the humidity change amount is larger than a first humidity threshold value; acquiring the temperature of the air inlet, and calculating the temperature difference between the target set temperature and the temperature of the air inlet; and adjusting the working frequency of the compressor 202 in the heat pump dryer according to the temperature difference until the humidity variation is less than or equal to a first humidity threshold value, and controlling the compressor 202 to stop working.
In an exemplary embodiment, an electric heater 205 may be further disposed between the condenser 203 and the air inlet 10 of the drying chamber, and the temperature of the air inlet 10 is adjusted by controlling on or off of the electric heater 205. For example, in a case that the temperature difference between the target set temperature and the air inlet temperature is greater than the set temperature difference threshold, which indicates that a higher amount of heat needs to be provided to the air inlet 10 currently, the electric heater 205 may be turned on to assist the thermodynamic cycle loop to provide more heat; when the temperature difference is less than or equal to the set temperature difference threshold, the electric heater 205 may be turned off.
Based on the heat pump dryer in the embodiment corresponding to fig. 2, the heat pump dryer control method based on the temperature of the air inlet according to the present invention is described with reference to fig. 3.
Fig. 3 is a schematic flowchart illustrating a method for controlling a heat pump dryer based on an intake air inlet temperature according to an embodiment of the present invention, and referring to fig. 3, the method for controlling a heat pump dryer based on an intake air inlet temperature may include steps 310 to 340 as follows.
Step 310: and acquiring the humidity variation of an air inlet and an air return inlet of the drying chamber of the heat pump dryer.
For example, in fig. 2, a first temperature sensor 208 and a first humidity sensor 210 may be disposed at the air inlet 10 of the heat pump dryer, and respectively collect an air inlet temperature Tin and an air inlet humidity Rhin of the air inlet 10, and based on the air inlet temperature Tin and the air inlet humidity Rhin, an air inlet mouth moisture content din may be determined; a second temperature sensor 209 and a second humidity sensor 211 can be arranged at the return air inlet 20, and respectively collect the return air inlet temperature Tout and the return air inlet humidity Rhout of the return air inlet 20, and the return air buccal moisture content dout can be determined based on the return air inlet temperature Tout and the return air inlet humidity Rhout; and then the moisture content variation D = dout-din between the air inlet and the air return inlet can be obtained.
Step 320: and determining the target set temperature according to the humidity change quantity under the condition that the humidity change quantity is larger than the first humidity threshold value.
The first humidity threshold can be used to determine whether the moisture in the object to be dried meets the drying requirement, that is, whether the dryness of the object to be dried meets the target requirement. Under the condition that the humidity variation between the air inlet and the air return inlet is larger than the first humidity threshold, the dryness of the dried object is not considered to meet the target requirement, and the drying is required to be continued. The humidity variation can reflect the humidity of the dried object, and the larger the humidity variation is, the more the moisture contained in the dried object is, the higher the temperature can be used for drying, so as to improve the drying speed. Based on this, the target set temperature required for drying the drying object can be determined according to the humidity change amount.
For example, the first humidity threshold may be a default value of the heat pump dryer system, or may be configured by a user according to a drying requirement, for example, according to a drying degree to be finally achieved by the object to be dried.
Step 330: and acquiring the temperature of the air inlet, and calculating the temperature difference between the target set temperature and the temperature of the air inlet.
The first temperature sensor 208 disposed at the air inlet 10 may acquire the air inlet temperature, and the controller 212 may acquire the air inlet temperature of the heat pump dryer through the first temperature sensor 208. After the air inlet temperature is obtained, the temperature difference between the target set temperature and the air inlet temperature can be calculated.
Step 340: and adjusting the working frequency of a compressor in the heat pump dryer according to the temperature difference until the humidity variation is less than or equal to a first humidity threshold value, and controlling the compressor to stop working.
The temperature of the air inlet can reflect the condition of heat input into the drying chamber, so that the temperature difference between the target set temperature and the temperature of the air inlet can reflect the temperature difference between the drying temperature required by the dried object and the temperature provided for the drying chamber, the larger the temperature difference is, the less the heat provided for the drying chamber is, the higher the heat supply force needs to be increased, and at the moment, the higher the pressure needs to be provided by the compressor, so that the heat pump unit can generate more heat. Based on the temperature difference, the working frequency of the compressor of the heat pump dryer can be adjusted by utilizing the temperature difference between the target set temperature and the temperature of the air inlet, different working frequencies are provided according to different temperature differences, so that the temperature of the air inlet is adjusted to be increased, the temperature provided for the drying chamber can reach the requirement of the target set temperature as soon as possible, the compressor can be controlled finely, the fine adjustment of the temperature of the air inlet is realized, and the drying efficiency and the drying quality are improved.
The controller may repeatedly perform steps 310 to 330 and the step of adjusting the operating frequency of the compressor in the heat pump dryer according to the temperature difference, and continuously adjust the operating frequency of the compressor to adjust the temperature provided to the drying chamber until the humidity variation of the air inlet and the air return inlet is less than or equal to the first humidity threshold, which indicates that the dryness of the object to be dried meets the drying target requirement, and at this time, may control the compressor to stop working.
According to the heat pump dryer control method based on the temperature of the air inlet, whether the humidity degree of a dried object meets the drying target requirement can be judged according to whether the humidity variation of the air inlet and the air return inlet of the drying chamber is larger than a first humidity threshold, when the humidity variation is larger than the first humidity threshold, the drying target requirement is not met, the drying temperature needs to be controlled, the target set temperature required by the dried object in the current state is determined based on the humidity variation, the working frequency of the compressor is adjusted by using the temperature difference between the target set temperature and the temperature of the air inlet, the fine control of the working frequency of the compressor can be realized, the compressor works in a better state, the drying heat required by the dried object in the current state is provided for the drying chamber, the accurate control of the temperature of the drying chamber is realized, the drying efficiency is improved, and the energy consumption is reduced; the adjustment process can be repeatedly executed until the humidity variation is less than or equal to the first humidity threshold value, the moisture in the dried object can be accurately judged to meet the target requirement, and the compressor can be controlled to stop working at the moment, so that transitional drying and unnecessary energy consumption are avoided. Based on the method, whether the dryness of the dried object meets the target requirement can be accurately judged, the fine control of the working frequency of the compressor in the heat pump dryer is realized, the control logic of the heat pump dryer is optimized, the drying efficiency of the heat pump dryer is improved, and the energy consumption is reduced.
Based on the method of fig. 3 in the corresponding embodiment, in an example embodiment, in the case that the humidity change amount is greater than the first humidity threshold, determining the target set temperature according to the humidity change amount may include: determining the target set temperature as a first temperature under the condition that the humidity change amount is larger than a first humidity threshold and smaller than or equal to a second humidity threshold; and under the condition that the humidity variation is larger than a second humidity threshold value, determining the target set temperature as the maximum rated temperature of the drying chamber of the heat pump dryer, wherein the first temperature is smaller than the maximum rated temperature.
The second humidity threshold value can be used for determining whether the dried object needs to be dried by using the maximum rated temperature, if the humidity variation is larger than the second humidity threshold value, the dried object contains a large amount of moisture, and the dried object needs to be dried by using a higher temperature, so that the drying efficiency is improved; if the humidity variation is greater than the first humidity threshold and less than or equal to the second humidity threshold, it indicates that the moisture in the object being dried is gradually reduced and is approaching the final dryness requirement, and in order to avoid the excessive drying and even damage to the object being dried due to continuous high-temperature drying, the target set temperature can be reduced to the first temperature, so that the object being dried is dried at a proper temperature, and the drying effect and quality are ensured.
Based on the method of the embodiment corresponding to fig. 3, in an exemplary embodiment, a first temperature difference threshold may be set, and if the temperature difference between the target set temperature and the temperature of the air inlet is greater than the first temperature difference threshold, it indicates that the temperature of the air inlet is too low, and the efficiency is low when drying the object to be dried with the temperature, and it is necessary to increase the temperature of the air inlet as soon as possible, at this time, the compressor may be operated at the maximum operating frequency to generate the maximum heat, so that the drying chamber is rapidly heated, and the object to be dried is dried at a higher temperature. When the temperature difference is reduced to a certain degree, for example, less than or equal to the first temperature difference threshold, the temperature of the air inlet reaches a certain requirement, the dried object can be dried to a certain degree, and at this time, the working frequency of the compressor can be readjusted, for example, the working frequency of the compressor is moderately reduced.
Specifically, adjusting the operating frequency of the compressor in the heat pump dryer according to the temperature difference may include: and under the condition that the temperature difference is greater than the first temperature difference threshold value, controlling the working frequency of the compressor to be kept at the maximum working frequency of the compressor until the temperature difference is less than or equal to the first temperature difference threshold value.
For example, an electric heater may be disposed between the condenser and the air inlet of the drying chamber, and the electric heater may provide electric heat to the air inlet. For example, the interval greater than the first temperature difference threshold may be divided into different sections, and the electric heater may be controlled differently in the different sections. For example, the interval greater than the first temperature difference threshold may be divided into a section greater than the first temperature difference threshold and less than or equal to the fourth temperature difference threshold and a section greater than the fourth temperature difference threshold with the fourth temperature difference threshold as a division point, and accordingly, the electric heater may be turned on if the temperature difference between the target set temperature and the intake air inlet temperature is greater than the fourth temperature difference threshold, and turned off if the temperature difference between the target set temperature and the intake air inlet temperature is greater than the first temperature difference threshold and less than or equal to the fourth temperature difference threshold. Therefore, the temperature rising speed of the air inlet can be increased, the drying efficiency is improved, the electric heater can be timely turned off under the condition that the heat supply requirement can be met only by the compressor thermodynamic cycle loop, and the energy consumption is reduced.
Further, under the condition that the temperature difference between the target set temperature and the temperature of the air inlet is larger than a second temperature difference threshold and smaller than or equal to a first temperature difference threshold, the initial frequency can be determined based on the temperature difference, the working frequency of the compressor is adjusted to the initial frequency, then the temperature variation of the air inlet can be obtained once every first set time period, and the working frequency of the compressor is adjusted based on the temperature variation until the temperature difference between the target set temperature and the temperature of the air inlet is smaller than or equal to the second temperature difference threshold. Therefore, when the temperature difference between the target set temperature and the temperature of the air inlet is reduced to a certain range, the working frequency of the compressor can be further controlled more finely by utilizing the temperature variation of the air inlet, so that the compressor can work at a better working frequency and reduce energy consumption while providing the required drying temperature for the dried objects in the drying chamber according to the temperature variation of the air inlet.
In an example embodiment, the interval from the second temperature difference threshold to the first temperature difference threshold may be divided, and different control logics for the operating frequency of the compressor may be set for different temperature difference intervals. For example, a third temperature difference threshold between the second temperature difference threshold and the first temperature difference threshold may be used as a division point, and the division point is divided into a section greater than the third temperature difference threshold and less than or equal to the first temperature difference threshold, and a section greater than the second temperature difference threshold and less than or equal to the third temperature difference threshold.
Based on this, for example, determining the initial frequency based on the temperature difference may include: and determining the frequency difference between the maximum working frequency of the compressor and the preset frequency as the initial frequency under the condition that the temperature difference is greater than a third temperature difference threshold and less than or equal to the first temperature difference threshold, wherein the third temperature difference threshold is greater than the second temperature difference threshold. Accordingly, adjusting the operating frequency of the compressor based on the amount of temperature change may include: controlling the working frequency of the compressor to be kept at the current working frequency in response to the temperature variation being larger than the first threshold; in response to the amount of temperature change being less than or equal to the first threshold, the operating frequency of the compressor is increased by a first frequency amplitude.
Therefore, in the temperature rise process of the air inlet, if the temperature variation of the air inlet is detected to be larger than the first threshold, the temperature of the air inlet is always increased, the working frequency of the compressor meets the temperature rise requirement, and the working frequency of the compressor can be controlled to be kept at the current working frequency; if the detected temperature variation of the air inlet is smaller than or equal to the first threshold, the temperature rise amplitude is gradually reduced, and the condition of no temperature rise may occur, at this time, the working frequency of the compressor may be increased to ensure the temperature rise requirement of the air inlet.
For example, determining the initial frequency based on the temperature difference may include: and under the condition that the temperature difference is greater than the second temperature difference threshold value and less than or equal to a third temperature difference threshold value, determining the current working frequency of the compressor as the initial frequency, wherein the third temperature difference threshold value is less than the first temperature difference threshold value. Accordingly, adjusting the operating frequency of the compressor based on the amount of temperature change includes: in response to the temperature variation being greater than a second threshold, reducing the operating frequency of the compressor by a second frequency amplitude; and increasing the operating frequency of the compressor by a second frequency amplitude in response to the temperature variation being less than or equal to a second threshold. The second threshold may be 0, for example, so that the temperature of the air inlet can be stabilized near the target set temperature, and the drying object can be dried at the required target set temperature.
Illustratively, the second frequency amplitude may be the same as or different from the first frequency amplitude. The first threshold may be greater than the second threshold.
Further, under the condition that the temperature difference between the target set temperature and the air inlet temperature is smaller than or equal to a second temperature difference threshold value, the working frequency of the compressor can be reduced by a third frequency amplitude, then the temperature difference between the target set temperature and the air inlet temperature is obtained once every second set time period, and based on the temperature difference, the working frequency of the compressor is adjusted by combining the method for adjusting the working frequency of the compressor by using the temperature difference until the temperature difference is larger than the second temperature difference threshold value, and the control logic of the corresponding time period when the temperature difference is larger than the second temperature difference threshold value can be skipped to.
The second temperature difference threshold may be used to determine whether the current temperature of the air inlet exceeds the target set temperature, and accordingly, a value of the second temperature difference threshold may be set, which may be a negative number in this example embodiment, for example, may be set to be-2. If the temperature difference between the target set temperature and the temperature of the air inlet is smaller than or equal to the second temperature difference threshold, the temperature of the air inlet exceeds the target set temperature, the heat provided for the drying chamber exceeds the drying temperature required by the dried object, at this time, the working frequency of the compressor needs to be reduced, and the phenomenon that the dried object is excessively dried due to overhigh temperature of the drying chamber or even damaged is avoided.
Based on the above embodiments, the heat pump dryer control method based on the air inlet temperature provided by the present invention is further exemplified below by taking as an example that the first humidity threshold is d1, the second humidity threshold is d2, the first temperature difference threshold is 10, the second temperature difference threshold is-2, and the third temperature difference threshold is 2.
Assuming that the temperature of an air inlet of the drying chamber is Tin, the humidity of the air inlet is Rhin, the temperature of a return air inlet is Tout, and the humidity of the return air inlet is Rhout, the Tin and the Rhin can be used for calculating to obtain an air inlet water moisture content din, the Tout and the Rhout are used for calculating to obtain a return air water moisture content dout, and then the humidity variation D = dout-din between the air inlet and the return air inlet can be obtained. Then, whether the moisture contained in the dried object meets the target requirement can be judged through the humidity change amount, and the operating frequency of the compressor is controlled by taking the moisture as a control target. Wherein, the moisture content calculated by using the temperature and the humidity may be, for example: moisture content was obtained by looking up the psychrometric chart based on temperature and humidity.
Assuming that the target set temperature parameter is T, the maximum rated temperature of the drying chamber is Tmax, and the maximum working frequency of the compressor is Fmax.
After the heat pump dryer is started to operate, the drying thermodynamic loop and the dehumidifying thermodynamic loop work, heat is conveyed to the drying chamber through the air inlet, the controller calculates humidity variation D between the air inlet and the air return inlet according to the collected temperature Tin of the air inlet, the collected humidity Rhin of the air inlet, the collected temperature Tout of the air return inlet and the collected humidity Rhout of the air return inlet, and judges the humidity variation D.
If D is more than D2, the dried object has a large amount of moisture, and the dried object can be dried by high temperature, at this time, the target set temperature T of the air inlet can be adjusted to Tmax, then the temperature difference between T and the temperature Tin of the air inlet is obtained in real time, and the working frequency of the compressor is controlled based on the temperature difference. For example, the control of the operating frequency of the compressor may be performed according to the following 4 cases of the temperature difference:
(1) If (T-Tin) < 10, the operating frequency f of the compressor can be adjusted to Fmax, whereby heat is continuously supplied to the drying chamber until (T-Tin) < 10 is detected.
(2) If 2 < (T-Tin) ≦ 10, adjusting the operating frequency f of the compressor to Fmax-5, and within the temperature difference range, judging a temperature change amount Δ T of Tin in a first set period of time, for example, in a period of every 1 minute, comparing the temperature change amount Δ T with a first threshold tx1, and adjusting the operating frequency f of the compressor based on the comparison result until (T-Tin) ≦ 2 is detected; wherein tx1 can be 1 or 2, for example, to realize fine adjustment of temperature; Δ t = t1-t0, t1 being the air inlet temperature at the end of the 1 minute period, t0 being the air inlet temperature at the beginning of the 1 minute period;
for example, if Δ t > tx1, the current operating frequency f of the compressor is kept unchanged; if Δ t ≦ tx1, the operating frequency f of the compressor at that time is increased, for example to f +1.
(3) If-2 < (T-Tin) ≦ 2, the current operating frequency f of the compressor is kept unchanged, and within the temperature difference range, the temperature change amount Δ T of Tin may be determined for a first set period of time, for example, for every 1 minute, and then the operating frequency f of the compressor may be adjusted based on the magnitude relationship between Δ T and the second threshold until (T-Tin) ≦ 2 is detected; wherein Δ t = t1-t0, t1 is the air inlet temperature at the end of the 1 minute period, and t0 is the air inlet temperature at the beginning of the 1 minute period;
for example, the second threshold may be 0, and if Δ t > 0, the operating frequency f of the compressor is reduced, for example to f-1; if Δ t ≦ 0, the operating frequency f of the compressor is increased, for example to f +1.
(4) If (T-Tin) ≦ 2, the current operating frequency f of the compressor is increased, such as to f +2, and then the value of (T-Tin) is determined for a second set period of time, such as every 1 minute, within the temperature difference range until (T-Tin) > -2, and the control logic of (3) may be returned. The second set time period may be the same as or different from the first set time period.
Therefore, under the condition that D is larger than D2, the working frequency of the compressor can be finely controlled based on the temperature difference between the maximum rated temperature of the drying chamber and the temperature of the air inlet, so that the working frequency of the compressor is stably controlled, the drying temperature requirement of the drying chamber is met, the compressor works in a better state, the energy utilization rate is improved, and the energy consumption is reduced.
Furthermore, if D1 is greater than D and less than or equal to D2, it indicates that the moisture content of the drying object is gradually reduced, that is, the dryness of the drying object gradually approaches the target dryness, and at this time, the target set temperature T of the air inlet may be reduced, for example, from Tmax to T1, so as to avoid excessive drying or even damage of the drying object due to a higher temperature. And then acquiring the temperature difference between the T and the air inlet temperature Tin in real time, and controlling the working frequency of the compressor based on the temperature difference. For example, the control can be similarly performed by using 4 cases (1) to (4) described above of the temperature difference.
Furthermore, if D is less than or equal to D1, the drying object in the drying chamber is dried, the dryness of the drying object reaches the target dryness requirement, at the moment, the heating can be stopped, and the compressor is controlled to stop.
Therefore, the humidity variation and the air inlet temperature between the air inlet and the air return opening are obtained in real time, the dry-wet state of the dried object in the drying chamber and the real-time temperature provided for the drying chamber can be accurately judged, the compressor is accurately controlled according to the different dry-wet states of the dried object and the real-time temperature provided for the drying chamber, whether the dryness of the dried object meets the target requirement can be accurately judged, and the purpose of accurately controlling the dryness of the dried object is achieved.
In an alternative exemplary embodiment, for the above case of (T-Tin) > 10, two cases of 10 < (T-Tin) ≦ 20 and (T-Tin) > 20 may be further divided, and the inlet temperature may be adjusted together with the compressor in combination with the electric heater disposed between the condenser and the inlet.
Specifically, if the T-Tin is more than 20, the electric heater is started, the working frequency f of the compressor is adjusted to Fmax, and heat is continuously supplied to the drying chamber until the T-Tin is detected to be less than or equal to 20. If 10 < (T-Tin) ≦ 20, the electric heater is turned off and the operating frequency f of the compressor is controlled to Fmax, whereby heat continues to be supplied to the drying chamber until (T-Tin) ≦ 10 is detected. Therefore, a proper heat supply mode can be selected according to the temperature difference between the target set temperature T and the air inlet temperature Tin, and the drying efficiency and the drying quality are improved.
The heat pump dryer control device based on the temperature of the air inlet provided by the invention is described below, and the heat pump dryer control device based on the temperature of the air inlet described below and the heat pump dryer control method based on the temperature of the air inlet described above can be referred to correspondingly.
Fig. 4 is a schematic structural diagram illustrating a heat pump dryer control apparatus based on a temperature of an inlet according to an embodiment of the present invention, and referring to fig. 4, the heat pump dryer control apparatus 400 based on the temperature of the inlet may include an obtaining module 410, a determining module 420, a calculating module 430, and a control module 440. The obtaining module 410 may be configured to obtain humidity variation of an air inlet and an air return inlet of the heat pump dryer; a determining module 420, configured to determine a target set temperature according to the humidity change amount when the humidity change amount is greater than the first humidity threshold; the calculating module 430 is configured to obtain an air inlet temperature of the heat pump dryer, and calculate a temperature difference between a target set temperature and the air inlet temperature; and the control module 440 is configured to adjust the operating frequency of the compressor of the heat pump dryer according to the temperature difference until the humidity variation is smaller than or equal to the first humidity threshold, and control the compressor to stop operating.
In an example embodiment, the control module 440 may include: and the first control unit is used for controlling the working frequency of the compressor to be kept at the maximum working frequency of the compressor under the condition that the temperature difference is greater than the first temperature difference threshold value until the temperature difference is less than or equal to the first temperature difference threshold value. In an example embodiment, the control module 440 may further include a second control unit, which may include: a determination subunit configured to determine, when the temperature difference is greater than a second temperature difference threshold and less than or equal to a first temperature difference threshold, an initial frequency based on the temperature difference; and the adjusting subunit is used for adjusting the working frequency of the compressor to the initial frequency, acquiring the temperature variation of the air inlet once every a first set time period, and adjusting the working frequency of the compressor based on the temperature variation until the temperature difference is less than or equal to a second temperature difference threshold.
In an example embodiment, the determining subunit may be specifically configured to determine, as the initial frequency, a frequency difference between the maximum operating frequency of the compressor and a preset frequency in a case where the temperature difference is greater than a third temperature difference threshold value and less than or equal to the first temperature difference threshold value, the third temperature difference threshold value being greater than the second temperature difference threshold value; the adjustment subunit may specifically be configured to: controlling the working frequency of the compressor to be kept at the current working frequency in response to the temperature variation being larger than the first threshold; in response to the amount of temperature change being less than or equal to the first threshold, the operating frequency of the compressor is increased by a first frequency amplitude.
In an example embodiment, the determining subunit may be specifically configured to determine the current operating frequency of the compressor as the initial frequency in a case where the temperature difference is greater than the second temperature difference threshold and less than or equal to a third temperature difference threshold, the third temperature difference threshold being less than the first temperature difference threshold; the adjustment subunit may be specifically configured to: in response to the temperature variation being greater than a second threshold, reducing the operating frequency of the compressor by a second frequency amplitude; and increasing the operating frequency of the compressor by a second frequency amplitude in response to the temperature change amount being less than or equal to a second threshold.
In an example embodiment, the control module 440 may further include: and the third control unit is used for reducing the working frequency of the compressor by a third frequency amplitude under the condition that the temperature difference is less than or equal to the second temperature difference threshold value, and acquiring the temperature difference between the target set temperature and the air inlet temperature once every second set time period until the temperature difference is greater than the second temperature difference threshold value.
In an example embodiment, the determining module 420 may include: a first determination unit configured to determine the target set temperature as a first temperature when the humidity change amount is greater than a first humidity threshold and less than or equal to a second humidity threshold; and a second determination unit for determining the target set temperature as a maximum rated temperature of the heat pump dryer drying chamber in the case that the humidity variation is greater than a second humidity threshold, the first temperature being less than the maximum rated temperature.
Based on the heat pump dryer in the embodiment corresponding to fig. 2, the controller of the heat pump dryer provided by the present invention may include a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the method for controlling the heat pump dryer based on the air intake temperature according to the foregoing method embodiments may be executed.
Fig. 5 is a schematic structural diagram of a controller in a heat pump dryer according to the present invention, and as shown in fig. 5, the controller 212 may include: a processor (processor) 510, a Communication Interface (Communication Interface) 520, a memory (memory) 530 and a Communication bus 540, wherein the processor 510, the Communication Interface 520 and the memory 530 are communicated with each other via the Communication bus 540. Processor 510 may invoke logic instructions in memory 530 to perform the heat pump dryer control method based on the inlet air temperature provided by the various method embodiments described above, which may include, for example: acquiring humidity variable quantities of an air inlet and an air return inlet of a drying chamber of the heat pump dryer; determining a target set temperature according to the humidity change amount under the condition that the humidity change amount is larger than a first humidity threshold value; acquiring the temperature of the air inlet, and calculating the temperature difference between the target set temperature and the temperature of the air inlet; and adjusting the working frequency of a compressor in the heat pump dryer according to the temperature difference until the humidity variation is less than or equal to a first humidity threshold value, and controlling the compressor to stop working.
In addition, the logic instructions in the memory 530 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as a stand-alone product. Based on such understanding, the technical solution of the present invention or a part thereof which substantially contributes to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute 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), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product, which includes a computer program, the computer program may be stored on a non-transitory computer readable storage medium, when the computer program is executed by a processor, the computer is capable of executing the heat pump dryer control method based on the air inlet temperature provided by the above method embodiments, the method may include: acquiring humidity variable quantities of an air inlet and an air return inlet of a drying chamber of the heat pump dryer; determining a target set temperature according to the humidity change amount under the condition that the humidity change amount is larger than a first humidity threshold value; acquiring the temperature of the air inlet, and calculating the temperature difference between the target set temperature and the temperature of the air inlet; and adjusting the working frequency of a compressor in the heat pump dryer according to the temperature difference until the humidity variation is less than or equal to a first humidity threshold value, and controlling the compressor to stop working.
In yet another aspect, the present invention also provides a non-transitory computer readable storage medium, on which a computer program is stored, the computer program being implemented by a processor to execute the method for controlling a heat pump dryer based on an air inlet temperature provided by the above method embodiments, where the method may include: acquiring humidity variable quantities of an air inlet and an air return inlet of a drying chamber of the heat pump dryer; determining a target set temperature according to the humidity change amount under the condition that the humidity change amount is larger than a first humidity threshold value; acquiring the temperature of the air inlet, and calculating the temperature difference between the target set temperature and the temperature of the air inlet; and adjusting the working frequency of a compressor in the heat pump dryer according to the temperature difference until the humidity variation is less than or equal to a first humidity threshold value, and controlling the compressor to stop working.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. Based on the understanding, the above technical solutions substantially or otherwise contributing to the prior art may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the various embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (11)
1. A heat pump dryer control method based on air inlet temperature is characterized by comprising the following steps:
acquiring humidity variable quantities of an air inlet and an air return inlet of a drying chamber of the heat pump dryer;
determining a target set temperature according to the humidity change amount under the condition that the humidity change amount is larger than a first humidity threshold value;
acquiring the temperature of an air inlet, and calculating the temperature difference between the target set temperature and the temperature of the air inlet;
and adjusting the working frequency of a compressor in the heat pump dryer according to the temperature difference until the humidity variation is less than or equal to the first humidity threshold value, and controlling the compressor to stop working.
2. The heat pump dryer control method based on the temperature of the air inlet according to claim 1, wherein the adjusting the working frequency of a compressor in the heat pump dryer according to the temperature difference comprises:
and under the condition that the temperature difference is greater than a first temperature difference threshold value, controlling the working frequency of the compressor to be kept at the maximum working frequency of the compressor until the temperature difference is less than or equal to the first temperature difference threshold value.
3. The heat pump dryer control method based on the temperature of the air inlet according to claim 2, further comprising:
determining an initial frequency based on the temperature difference if the temperature difference is greater than a second temperature difference threshold and less than or equal to the first temperature difference threshold;
adjusting the working frequency of the compressor to the initial frequency, and acquiring the temperature variation of the air inlet once every other first set time period;
and adjusting the working frequency of the compressor based on the temperature variation until the temperature difference is less than or equal to the second temperature difference threshold value.
4. The heat pump dryer control method according to claim 3, wherein the determining the initial frequency based on the temperature difference comprises:
determining a frequency difference between a maximum working frequency of the compressor and a preset frequency as the initial frequency under the condition that the temperature difference is greater than a third temperature difference threshold and less than or equal to the first temperature difference threshold, wherein the third temperature difference threshold is greater than the second temperature difference threshold;
the adjusting the operating frequency of the compressor based on the amount of temperature change includes:
controlling the working frequency of the compressor to be kept at the current working frequency in response to the temperature variation being larger than a first threshold value;
in response to the amount of temperature change being less than or equal to the first threshold, increasing the operating frequency of the compressor by a first frequency magnitude.
5. The heat pump dryer control method according to claim 3, wherein the determining the initial frequency based on the temperature difference comprises:
determining the current working frequency of the compressor as the initial frequency under the condition that the temperature difference is greater than the second temperature difference threshold and less than or equal to a third temperature difference threshold, wherein the third temperature difference threshold is less than the first temperature difference threshold;
the adjusting the operating frequency of the compressor based on the temperature variation includes:
in response to the temperature variation being greater than a second threshold, reducing the operating frequency of the compressor by a second frequency amplitude;
in response to the temperature change amount being less than or equal to the second threshold, increasing the operating frequency of the compressor by a second frequency magnitude.
6. The heat pump dryer control method based on the temperature of the air inlet according to claim 3, further comprising:
and under the condition that the temperature difference is less than or equal to the second temperature difference threshold value, reducing the working frequency of the compressor by a third frequency amplitude, and acquiring the temperature difference between the target set temperature and the air inlet temperature once every second set time period until the temperature difference is greater than the second temperature difference threshold value.
7. The heat pump dryer control method according to any one of claims 1 to 6, wherein in a case where the humidity change amount is greater than a first humidity threshold, determining a target set temperature according to the humidity change amount includes:
determining the target set temperature as a first temperature under the condition that the humidity change amount is greater than a first humidity threshold and less than or equal to a second humidity threshold;
and under the condition that the humidity change amount is larger than the second humidity threshold value, determining that the target set temperature is the maximum rated temperature of the drying chamber of the heat pump dryer, wherein the first temperature is smaller than the maximum rated temperature.
8. The utility model provides a heat pump drying-machine controlling means based on air intake temperature which characterized in that includes:
the acquisition module is used for acquiring humidity variable quantities of an air inlet and an air return inlet of the heat pump dryer;
the determining module is used for determining a target set temperature according to the humidity variation under the condition that the humidity variation is larger than a first humidity threshold;
the calculation module is used for acquiring the temperature of an air inlet of the heat pump dryer and calculating the temperature difference between the target set temperature and the temperature of the air inlet;
and the control module is used for adjusting the working frequency of a compressor of the heat pump dryer according to the temperature difference until the humidity variation is smaller than or equal to the first humidity threshold value, and controlling the compressor to stop working.
9. A heat pump dryer is characterized by comprising an evaporator, a compressor, a condenser, a dehumidifier, a first expansion valve and a second expansion valve; the compressor, the condenser, the first expansion valve and the dehumidifier are sequentially connected to form a dehumidification thermodynamic loop, and the evaporator, the compressor, the condenser and the second expansion valve are sequentially connected to form a drying thermodynamic loop;
further comprising: the device comprises a first temperature sensor, a first humidity sensor, a second temperature sensor, a second humidity sensor and a controller;
the first temperature sensor and the first humidity sensor are arranged at an air inlet of the drying chamber of the heat pump dryer, are respectively and electrically connected with the controller and are respectively used for collecting the temperature of the air inlet and the humidity of the air inlet;
the second temperature sensor and the second humidity sensor are arranged at an air return port of the drying chamber of the heat pump dryer, are respectively and electrically connected with the controller and are respectively used for collecting the temperature and the humidity of the air return port;
the controller includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and the processor when executing the computer program implements the heat pump dryer control method based on the intake air temperature according to any one of claims 1 to 7.
10. A non-transitory computer readable storage medium having a computer program stored thereon, wherein the computer program when executed by a processor implements the heat pump dryer control method according to any one of claims 1 to 7 based on the temperature of the air intake.
11. A computer program product comprising a computer program, wherein the computer program when executed by a processor implements the method of any of claims 1 to 7 for controlling a heat pump dryer based on a temperature of an air intake.
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