Methods and apparatus for controlling a heat pump dryer, electronic equipment, storage medium

Abstract

This application relates to the field of heat pump dryer technology, and discloses a method for controlling a heat pump dryer, comprising: identifying a system in a first drying system and a second drying system where a refrigerant leak occurs; shutting down the system where the refrigerant leak occurs; determining the amount of refrigerant leakage in the system where the refrigerant leak occurs; if the amount of refrigerant leakage does not reach a preset leakage amount, identifying the system without refrigerant leakage as the control system to be controlled; and controlling the control system to be controlled to heat the drying chamber to dry the material to be dried. By shutting down the system where the refrigerant leak occurs, and controlling the system without refrigerant leakage to heat the drying chamber to dry the material to be dried when the amount of refrigerant leakage in that system does not reach the preset leakage amount, the probability of the material to be dried deteriorating is reduced, thereby ensuring the drying effect and reducing the user's losses. This application also discloses an apparatus, electronic equipment, and storage medium for controlling a heat pump dryer.

Description

Technical Field

[0001] This application relates to the field of heat pump dryer technology, such as a method and apparatus for controlling a heat pump dryer, electronic equipment, and storage medium. Background Technology

[0002] Currently, heat pump dryers are widely used in various fields, including chemical, pharmaceutical, product manufacturing, timber, and agricultural products, offering advantages such as safety, environmental friendliness, energy efficiency, and high performance. Heat pump dryers use refrigerant to complete a thermodynamic cycle, thereby heating the drying chamber. However, in the event of refrigerant leakage, the heat pump dryer cannot raise the temperature inside the drying chamber to the required drying temperature, resulting in poor drying performance.

[0003] In the process of implementing the embodiments of this disclosure, it was found that at least the following problems exist in the related technology: In the prior art, when the refrigerant of the heat pump dryer leaks, the leakage situation is not considered, and the heat pump dryer is directly shut down, which makes it impossible for the material to be dried in the drying room to continue drying, resulting in the deterioration of the material and increasing the user's losses. Summary of the Invention

[0004] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0005] This disclosure provides a method, apparatus, electronic device, and storage medium for controlling a heat pump dryer, to address the issue of continuing to dry materials when the refrigerant in the heat pump dryer has not reached a preset leakage amount, thereby reducing the probability of the materials deteriorating.

[0006] In some embodiments, the heat pump dryer includes a first drying system and a second drying system, both of which are used for controlled heating. The method includes: identifying a system in the first and second drying systems where a refrigerant leak has occurred; shutting down the system where the refrigerant leak has occurred; determining the amount of refrigerant leakage in the system where the refrigerant leak has occurred; if the amount of refrigerant leakage does not reach a preset leakage amount, identifying a system without refrigerant leakage as a system to be controlled; and controlling the system to be controlled to heat in order to dry the material to be dried.

[0007] In some embodiments, the heat pump dryer includes a first drying system and a second drying system, both of which are used for controlled heating. The device includes: a shut-off module configured to determine a system in the heat pump dryer where a refrigerant leak has occurred; shutting off the system where the refrigerant leak has occurred; a first determining module configured to determine the amount of refrigerant leakage in the system where the refrigerant leak has occurred; a second determining module configured to determine a system without refrigerant leakage as a system to be controlled if the amount of refrigerant leakage does not reach a preset leakage amount; and a control module configured to control the system to be controlled to heat in order to dry the material to be dried.

[0008] In some embodiments, the apparatus for controlling a heat pump dryer includes a processor and a memory storing program instructions, the processor being configured to execute the method for controlling a heat pump dryer as described above when the program instructions are executed.

[0009] In some embodiments, the electronic device includes the above-described means for controlling a heat pump dryer.

[0010] In some embodiments, the storage medium stores program instructions that, when executed, perform the method described above for controlling a heat pump dryer.

[0011] The method, apparatus, electronic device, and storage medium for controlling a heat pump dryer provided in this disclosure can achieve the following technical effects: By identifying the system in the heat pump dryer where refrigerant leakage occurs, shutting down the system where refrigerant leakage occurs, and determining the amount of refrigerant leakage in the system where refrigerant leakage occurs, if the amount of refrigerant leakage in the system where refrigerant leakage occurs does not reach a preset leakage amount, the system where no refrigerant leakage occurs is identified as the system to be controlled. Then, the system to be controlled is controlled to heat the drying chamber to dry the material to be dried. This allows the heat pump dryer to compensate for the heat in the drying chamber even if the leakage amount of the heat pump dryer does not reach the preset leakage amount, thereby continuing drying, reducing the probability of the material to be dried deteriorating, ensuring the drying effect, and reducing the user's losses.

[0012] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0013] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein: Figure 1This is a schematic diagram of the structure of a heat pump dryer provided in an embodiment of this disclosure; Figure 2 This is a schematic diagram of the circuit principle of a heat pump dryer provided in an embodiment of this disclosure; Figure 3 This is a schematic diagram of a method for controlling a heat pump dryer provided in an embodiment of this disclosure; Figure 4 This is a schematic diagram of a method for determining a refrigerant leak according to an embodiment of this disclosure; Figure 5 This is a schematic diagram of an apparatus for controlling a heat pump dryer provided in an embodiment of this disclosure; Figure 6 This is a schematic diagram of another device for controlling a heat pump dryer provided in an embodiment of this disclosure.

[0014] Figure label: 1: First evaporator; 2: Second evaporator; 3: First gas-liquid separator; 4: Second gas-liquid separator; 5: First low-pressure switch; 6: Second low-pressure switch; 7: First compressor; 8: Second compressor; 9: First high-pressure switch; 10: Second high-pressure switch; 11: First condenser; 12: Second condenser; 13: First filter; 14: Second filter; 15: Dehumidifying evaporator; 16: First electronic expansion valve; 17: Second electronic expansion valve; 18: Dehumidifying electronic expansion valve; 19: Exhaust temperature sensor; 20: Control unit. Detailed Implementation

[0015] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0016] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0017] Unless otherwise stated, the term "multiple" means two or more.

[0018] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0019] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0020] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0021] Combination Figure 1 As shown in the diagram, this disclosure provides a structural schematic of a heat pump dryer. Figure 1As shown, the heat pump dryer includes a first drying system, a second drying system, and an electric auxiliary heating module. The first drying system includes a first compressor 7, a first electronic expansion valve 16, a first evaporator 1, a first filter 13, a first condenser 11, a first low-pressure switch 5, a first high-pressure switch 9, and a first gas-liquid separator 3; the second drying system includes a second compressor 8, a second electronic expansion valve 17, a dehumidifying electronic expansion valve 18, a second evaporator 2, a second filter 14, a second condenser 12, a second low-pressure switch 6, a second high-pressure switch 10, a dehumidifying evaporator 15, and a second gas-liquid separator 4. One end of the first compressor is connected to one end of the first high-pressure switch, and the other end of the first compressor is connected to one end of the first low-pressure switch. The other end of the first low-pressure switch is connected to one end of the first gas-liquid separator, the other end of the first gas-liquid separator is connected to one end of the first evaporator, the other end of the first evaporator is connected to one end of the first electronic expansion valve, the other end of the first electronic expansion valve is connected to one end of the first filter, the other end of the first filter is connected to one end of the first condenser, and the other end of the first condenser is connected to the other end of the first high-pressure switch. One end of the second compressor is connected to one end of the second high-pressure switch, and the other end of the second compressor is connected to one end of the second low-pressure switch. The other end of the second low-pressure switch is connected to one end of the second gas-liquid separator, the other end of the second gas-liquid separator is connected to one end of the second evaporator, the other end of the second evaporator is connected to one end of the second electronic expansion valve, the other end of the second electronic expansion valve is connected to one end of the second filter, the other end of the second filter is connected to one end of the second condenser, and the other end of the second condenser is connected to the other end of the second high-pressure switch. The other end of the second electronic expansion valve is also connected to one end of the dehumidifying electronic expansion valve, the other end of the dehumidifying electronic expansion valve is connected to one end of the dehumidifying evaporator, and the other end of the dehumidifying evaporator is connected to one end of the second evaporator. In this way, by setting up the first gas-liquid separator and the second gas-liquid separator, the liquid and gas flowing out from the first evaporator and the second evaporator can be separated, preventing liquid refrigerant from entering the first compressor and the second compressor and causing liquid accumulation. This ensures the normal operation of the first compressor and the second compressor and reduces the probability of failure of the first compressor and the second compressor due to liquid accumulation.

[0022] like Figure 2 As shown, Figure 2This is a schematic diagram of the circuit principle of a heat pump dryer. The heat pump dryer controls the first compressor 7, the second compressor 8, the first electronic expansion valve 16, the second electronic expansion valve 17, the dehumidifying electronic expansion valve 18, and the exhaust temperature sensor 19 via a control unit 20. The first electronic expansion valve is located between the first evaporator and the first filter; the control unit controls the opening of the first electronic expansion valve to enable the first drying system to heat. The second electronic expansion valve is located between the second evaporator and the second filter, and the dehumidifying electronic expansion valve is located between the dehumidifying evaporator and the second filter; the control unit controls the opening of the second electronic expansion valve to enable the second drying system to heat. The control unit also controls the closing of the second electronic expansion valve and the opening of the dehumidifying electronic expansion valve to enable the second drying system to dehumidify. The exhaust temperature sensor includes an exhaust temperature sensor for the first drying system and an exhaust temperature sensor for the second drying system. The exhaust temperature sensor monitors the exhaust temperature at the outlet of the heat pump dryer and feeds it back to the control unit.

[0023] Combination Figure 3 As shown in the embodiments of this disclosure, a method for controlling a heat pump dryer is provided. The heat pump dryer includes a first drying system and a second drying system, both of which are used for controlled heating. The method includes: Step S301: Identify the system in the first drying system and the second drying system where a refrigerant leak has occurred; shut down the system where the refrigerant leak has occurred.

[0024] Step S302: Determine the amount of refrigerant leakage in the system where the refrigerant leak has occurred.

[0025] Step S303: If the refrigerant leakage does not reach the preset leakage amount, the system in which no refrigerant leakage has occurred is identified as the system to be controlled.

[0026] Step S304: Control the system to be controlled to heat the material to be dried.

[0027] The method for controlling a heat pump dryer provided in this embodiment identifies a system in the heat pump dryer where refrigerant leakage occurs, shuts down the system where refrigerant leakage occurs, and determines the amount of refrigerant leakage in the system where refrigerant leakage occurs. If the amount of refrigerant leakage in the system where refrigerant leakage occurs does not reach a preset leakage amount, the system where no refrigerant leakage occurs is identified as the system to be controlled. Then, the system to be controlled heats the drying chamber to dry the material to be dried. This allows the heat pump dryer to compensate for the heat in the drying chamber even when the leakage amount of the heat pump dryer does not reach the preset leakage amount, thereby continuing drying, reducing the probability of the material to be dried deteriorating, ensuring the drying effect, and reducing the user's losses.

[0028] Optionally, the first drying system includes a first evaporator, and the second drying system includes a second evaporator. The system experiencing refrigerant leakage is determined by: collecting power data from multiple heat pump dryers over a preset time period to obtain a power sequence, with each power in the power sequence ordered by the collection time; collecting multiple exhaust temperatures at the exhaust vents of the heat pump dryers over the preset time period; acquiring multiple temperatures of the first evaporator over the preset time period; acquiring multiple temperatures of the second evaporator over the preset time period; determining the power change trend based on each power; if the power change trend is decreasing and the difference between the first and last power in the power sequence reaches a first preset difference, determining the exhaust temperature change trend, the first evaporator temperature change trend, and the second evaporator temperature change trend; if the exhaust temperature change trend is increasing and the first evaporator temperature change trend is decreasing, determining the system experiencing refrigerant leakage as the first drying system; or, if the exhaust temperature change trend is increasing and the second evaporator temperature change trend is decreasing, determining the system experiencing refrigerant leakage as the second drying system.

[0029] In some embodiments, the main reason for the rise in compressor discharge temperature is the increase in compressor pressure ratio. Under the premise of the same environmental compressor frequency and electronic expansion valve opening, the discharge temperature rises while the evaporator temperature falls, resulting in a decrease in return gas pressure and discharge pressure. However, due to the increase in compressor pressure ratio, refrigerant leakage is necessary to cause a decrease in return gas pressure and discharge pressure simultaneously with the increase in compressor pressure ratio. Thus, by acquiring the power, discharge temperature, first evaporator temperature, and second evaporator temperature over a preset time period, the system experiencing refrigerant leakage can be identified based on the changing trends of these parameters. This improves the accuracy of the judgment and facilitates the identification of systems without refrigerant leakage as control systems to be controlled, allowing for continued drying, reducing the probability of material deterioration, ensuring drying effect, and minimizing user losses.

[0030] Optionally, the exhaust temperature is collected by an exhaust temperature sensor located at the outlet of the heat pump dryer. Optionally, the exhaust temperature includes the exhaust temperature of the first compressor and the exhaust temperature of the second compressor.

[0031] Optionally, if the discharge temperature of the first compressor shows an upward trend and the temperature of the first evaporator shows a downward trend, the system in which refrigerant leakage occurs is identified as the first drying system; if the discharge temperature of the second compressor shows an upward trend and the temperature of the second evaporator shows a downward trend, the system in which refrigerant leakage occurs is identified as the second drying system.

[0032] Optionally, if the exhaust temperature shows an upward trend, the temperature of the first evaporator shows a downward trend, and the temperature of the second evaporator shows a downward trend, the system where the refrigerant leak occurs is determined to be the first drying system and the second drying system.

[0033] Optionally, the duration of the preset time period is a preset duration. Optionally, the preset duration is greater than or equal to 15 hours.

[0034] Optionally, within a preset time period, the environment in which the heat pump dryer is located, the frequency of the compressor set in the heat pump dryer, and the valve opening degrees of the first electronic expansion valve, the second electronic expansion valve, and the dehumidification electronic expansion valve of the heat pump dryer remain unchanged.

[0035] Optionally, a power sequence is obtained by collecting the power of multiple heat pump dryers within a preset time period, including: collecting the power of the heat pump dryers at first preset time intervals within the preset time period, and arranging the power of the multiple heat pump dryers collected within the preset time period in the order of collection time to obtain a power sequence. In some embodiments, the first preset time interval is 3 hours. In some embodiments, the number of heat pump dryer power measurements collected within the preset time period is 4.

[0036] Optionally, the heat pump dryer is equipped with an exhaust temperature sensor at the air outlet, which is used to monitor the exhaust temperature at the air outlet of the heat pump dryer.

[0037] Optionally, multiple exhaust temperatures can be collected at the exhaust port of the heat pump dryer within a preset time period, including: collecting the exhaust temperature once every second preset time interval within the preset time period using an exhaust temperature sensor.

[0038] Optionally, the control unit of the heat pump dryer stores the temperatures of the first evaporator and the second evaporator.

[0039] Optionally, the temperature of multiple first evaporators can be acquired within a preset time period, including: reading the temperature of the first evaporator through the control unit every second preset time interval within the preset time period.

[0040] Optionally, the temperature of multiple second evaporators can be acquired within a preset time period, including: reading the temperature of the second evaporator through the control unit every second preset time interval within the preset time period.

[0041] Optionally, the power change trend can be determined based on each power, including: fitting each power according to the acquisition time to obtain a power fitting curve and its corresponding monotonicity; when the power fitting curve is monotonically increasing, the power change trend is determined to be an upward trend; or, when the power fitting curve is monotonically decreasing, the power change trend is determined to be a downward trend.

[0042] In some embodiments, the first preset difference is 10%.

[0043] Optionally, determining the trend of exhaust temperature variation includes: acquiring the collection time of exhaust temperature; fitting each exhaust temperature according to the collection time to obtain an exhaust temperature fitting curve and its corresponding monotonicity; determining the trend of exhaust temperature variation as an upward trend when the exhaust temperature fitting curve is monotonically increasing; or, determining the trend of exhaust temperature variation as a downward trend when the exhaust temperature fitting curve is monotonically decreasing.

[0044] Optionally, determining the temperature change trend of the first evaporator includes: acquiring the reading time of the temperature of the first evaporator; fitting the temperature of each first evaporator according to the reading time to obtain the temperature fitting curve of the first evaporator and its corresponding monotonicity; when the temperature fitting curve of the first evaporator is monotonically increasing, determining that the temperature change trend of the first evaporator is an upward trend; or, when the temperature fitting curve of the first evaporator is monotonically decreasing, determining that the temperature change trend of the first evaporator is a downward trend.

[0045] Optionally, determining the temperature change trend of the second evaporator includes: acquiring the reading time of the temperature of the second evaporator; fitting the temperature of each second evaporator according to the reading time to obtain the temperature fitting curve of the second evaporator and its corresponding monotonicity; when the temperature fitting curve of the second evaporator is monotonically increasing, determining that the temperature change trend of the second evaporator is an upward trend; or, when the temperature fitting curve of the second evaporator is monotonically decreasing, determining that the temperature change trend of the second evaporator is a downward trend.

[0046] Optionally, determining the amount of refrigerant leakage in the system where refrigerant leakage has occurred includes: obtaining the difference between the first power and the last power in the power sequence; if the difference is less than a second preset difference, determining that the amount of refrigerant leakage has not reached a preset leakage amount; or, if the difference is greater than or equal to the second preset difference, determining that the amount of refrigerant leakage has reached a preset leakage amount.

[0047] In some embodiments, if the refrigerant leakage occurs in the first drying system, and the power of the first drying system is 30% and the power of the last system is 15%, with a difference of 15%, where 15% is greater than 10% and less than 20%, then it is determined that the refrigerant leakage of the first drying system has not reached the preset leakage amount. The system that has not experienced refrigerant leakage, i.e., the second drying system, is then identified as the system to be controlled.

[0048] In some embodiments, if the refrigerant leakage reaches a preset leakage amount, it is determined that the refrigerant leakage of the heat pump dryer is large, and the refrigerant leakage of the dryer is serious. If the heat pump dryer continues to operate at this time, it will reduce the life of the heat pump dryer. Therefore, the heat pump dryer is stopped and waited for maintenance personnel to repair the heat pump dryer.

[0049] Combination Figure 4 As shown, this disclosure provides another method for determining a system in which a refrigerant leak has occurred, wherein a first drying system includes a first evaporator and a second drying system includes a second evaporator, the method comprising: Step S401: Collect multiple power data of the heat pump dryer within a preset time period to obtain a power sequence. The power data in the power sequence are sorted according to the collection time. Collect multiple exhaust temperatures at the exhaust port of the heat pump dryer within the preset time period. Obtain multiple temperatures of the first evaporator within the preset time period. Step S402: Determine the power variation trend based on the power of each heat pump dryer; Step S403: When the power change trend is downward and the difference between the first power and the last power in the power sequence reaches the first preset difference, determine the change trend of the exhaust temperature and the change trend of the temperature of the first evaporator. In step S404, if the exhaust temperature shows an upward trend and the temperature of the first evaporator shows a downward trend, the system in which the refrigerant leak occurs is identified as the first drying system.

[0050] In this way, by collecting power data from multiple heat pump dryers over a preset time period, a power sequence, multiple exhaust temperatures, and multiple temperatures of the first evaporator can be obtained. The changing trends of power, exhaust temperature, and the first evaporator can be determined. Thus, if the exhaust temperature shows an upward trend and the first evaporator temperature shows a downward trend, the system experiencing refrigerant leakage can be identified as the first drying system. This enables the detection of refrigerant leakage faults in the first drying system, facilitating the identification of systems without refrigerant leakage as the control system to be controlled, and allowing continued drying to continue, reducing the probability of material deterioration and ensuring drying effect, thereby minimizing user losses.

[0051] Optionally, the control system to be controlled is a first drying system, which includes a first compressor, a first evaporator, a first condenser, and a first electronic expansion valve. Controlling the control system to perform heating includes: increasing the frequency of the first compressor according to the difference, and correcting the valve opening of the first electronic expansion valve according to the difference, so that the control system to perform heating.

[0052] In this way, the frequency of the first compressor and the valve opening of the first electronic expansion valve are adjusted according to the difference, so that the control system can heat the material to be dried, reduce the probability of the material deteriorating, thereby ensuring the drying effect and reducing the user's losses.

[0053] Optionally, increasing the frequency of the first compressor based on the power difference includes: determining the quotient between the power difference and a preset power threshold; determining the increase frequency of the first compressor based on the quotient and a preset compressor frequency step size; and increasing the frequency of the first compressor based on the increase frequency. In this way, by determining the quotient between the difference between the first and last power in the power sequence and a preset power threshold, and determining the increase frequency of the first compressor based on the quotient and a preset compressor frequency step size, and then increasing the frequency of the first compressor based on the increase frequency, precise control of the first compressor is achieved. This makes the heating conditions more consistent with the power requirements of the heat pump dryer, reduces the probability of material deterioration, ensures drying effect, and minimizes user losses.

[0054] Optionally, determining the quotient between the difference and a preset power threshold includes: dividing the difference by the preset power threshold to obtain the quotient between the difference and the preset power threshold.

[0055] Optionally, determining the increasing frequency of the first compressor based on the quotient and a preset compressor frequency step size includes: multiplying the quotient by the compressor frequency step size to obtain the determined increasing frequency of the first compressor. Optionally, the compressor frequency step size is 2Hz.

[0056] In some embodiments, the power threshold is 5%, the difference is 15%, the preset compressor frequency step is 2Hz, and the quotient between the difference and the preset power threshold is determined to be 3. Then, the quotient is multiplied by the preset compressor frequency step to obtain the increased frequency of the first compressor as 6Hz, that is, for every 5% increase in the difference, the frequency of the first compressor increases by 2Hz.

[0057] In this way, by adjusting the frequency of the first compressor, the heating capacity of the first drying system is increased, so that the temperature inside the drying room can meet the requirements of the drying process and ensure the drying effect.

[0058] Optionally, the valve opening of the first electronic expansion valve is corrected based on the difference, including: determining the quotient between the difference and a preset power threshold; determining the number of steps to increase the valve opening of the first electronic expansion valve based on the quotient and a preset valve opening step size; and increasing the valve opening of the first electronic expansion valve based on the number of steps to increase the valve opening of the first electronic expansion valve.

[0059] In this way, by determining the quotient between the difference between the first and last power in the power sequence and a preset power threshold, and by determining the number of steps to increase the valve opening of the first electronic expansion valve based on the quotient and the preset valve opening step size, the valve opening of the first electronic expansion valve is increased according to the number of steps to increase the valve opening of the first electronic expansion valve. This achieves precise control of the valve opening of the first electronic expansion valve, making the heating situation more in line with the power requirements of the heat pump dryer, reducing the probability of the material to be dried deteriorating, thereby ensuring the drying effect and reducing the user's losses.

[0060] Optionally, determining the number of steps to increase the valve opening of the first electronic expansion valve based on the quotient and a preset valve opening step size includes: multiplying the quotient by the preset valve opening step size to obtain the number of steps to increase the valve opening of the first electronic expansion valve. Optionally, the preset valve opening step size is 2 steps.

[0061] In some embodiments, the power threshold is 5%, the difference is 15%, the preset valve opening step size is 2 steps, and the quotient between the difference and the preset power threshold is determined to be 3. Then, the quotient is multiplied by the valve opening step size to obtain the number of steps by which the valve opening of the first electronic expansion valve increases. That is, for every 5% increase in the difference, the valve opening of the first electronic expansion valve increases by 2 steps, so the valve opening of the first electronic expansion valve increases by 6 steps.

[0062] By adjusting the opening degree of the first electronic expansion valve, the refrigerant flow rate of the first electronic expansion valve is adjusted to a second preset range, so that the first evaporator can perform refrigeration, increasing the heating capacity of the first condenser, and ensuring that the temperature inside the drying chamber meets the requirements of the materials to be dried. In some embodiments, the process of the electronic expansion valve going from fully closed to fully open involves 480 steps.

[0063] Optionally, the control system to be controlled is a second drying system; the second drying system includes a second compressor, a second evaporator, a second condenser, a second electronic expansion valve, a dehumidifying evaporator, and a dehumidifying electronic expansion valve; the dehumidifying evaporator is used to controllably dehumidify the return air of the drying chamber, and the dehumidifying electronic expansion valve is used to controllably adjust the return gas superheat of the dehumidifying evaporator; controlling the control system to perform heating includes: increasing the frequency of the second compressor according to the difference; adjusting the valve opening of the dehumidifying electronic expansion valve to adjust the refrigerant flow of the dehumidifying electronic expansion valve within a first preset range, so that the dehumidifying evaporator performs cooling with a preset return gas superheat; correcting the valve opening of the second electronic expansion valve and the dehumidifying electronic expansion valve according to the difference, so as to control the control system to perform heating. Thus, since the second drying system has a dehumidifying electronic expansion valve, by adjusting the valve opening of the dehumidifying electronic expansion valve to adjust the refrigerant flow of the dehumidifying electronic expansion valve within a first preset range, so that the dehumidifying evaporator performs cooling with a preset return gas superheat, the heating function of the second condenser is increased, and the heating efficiency is improved.

[0064] Optionally, increasing the frequency of the second compressor based on the difference includes: determining the quotient between the difference and a preset power threshold; multiplying the quotient by a compressor frequency step size to obtain a determined increase frequency for the second compressor; and increasing the frequency of the second compressor based on the increase frequency.

[0065] In this way, by adjusting the frequency of the second compressor to increase the heating capacity of the second drying system, the temperature inside the drying chamber can meet the requirements of the drying process, thereby ensuring the drying effect.

[0066] Optionally, the valve opening of the second electronic expansion valve and the valve opening of the dehumidifying electronic expansion valve are corrected based on the difference, including: determining the quotient between the difference and a preset power threshold; determining the number of steps to increase the valve opening of the second electronic expansion valve by multiplying the quotient by the valve opening step size; determining the number of steps to increase the valve opening of the dehumidifying electronic expansion valve by multiplying the quotient by the valve opening step size; increasing the valve opening of the second electronic expansion valve by the number of steps to increase the valve opening of the second electronic expansion valve; and increasing the valve opening of the dehumidifying electronic expansion valve by the number of steps to increase the valve opening of the dehumidifying electronic expansion valve.

[0067] In this way, by adjusting the valve opening of the second electronic expansion valve and the dehumidification electronic expansion valve, the refrigerant flow of the second electronic expansion valve and the dehumidification electronic expansion valve is adjusted to a second preset range, so that the second evaporator and the dehumidification evaporator can perform refrigeration, increase the heating capacity of the second condenser, and enable the temperature inside the drying chamber to meet the temperature requirements of the drying material.

[0068] Combination Figure 5 As shown, this disclosure provides an apparatus for controlling a heat pump dryer, including a shut-off module 501, a first determining module 502, a second determining module 503, and a control module 504. The shut-off module 501 is configured to determine a system in the heat pump dryer where a refrigerant leak has occurred; and shut down the system where the refrigerant leak has occurred. The first determining module 502 is configured to determine the amount of refrigerant leakage in the system where the refrigerant leak has occurred. The second determining module 503 is configured to determine the system without refrigerant leakage as a system to be controlled if the amount of refrigerant leakage does not reach a preset leakage amount. The control module 504 is configured to control the system to be controlled to heat the material to be dried.

[0069] The apparatus for controlling a heat pump dryer provided in this embodiment identifies a system in the heat pump dryer where a refrigerant leak has occurred, shuts down the system where the refrigerant leak has occurred, and determines the amount of refrigerant leakage in the system where the refrigerant leak has occurred. If the amount of refrigerant leakage in the system where the refrigerant leak has occurred does not reach a preset leakage amount, the system where no refrigerant leak has occurred is identified as the system to be controlled. Then, the system to be controlled heats the drying chamber to dry the material to be dried. This allows the heat pump dryer to compensate for the heat in the drying chamber even when the leakage amount of the heat pump dryer does not reach the preset leakage amount, thereby continuing the drying process, reducing the probability of the material to be dried deteriorating, ensuring the drying effect, and reducing the user's losses.

[0070] Optionally, the first drying system includes a first evaporator, and the second drying system includes a second evaporator. This disclosure provides an apparatus for controlling a heat pump dryer, which determines the system experiencing refrigerant leakage in the first and second drying systems through the following methods: collecting power data from multiple heat pump dryers over a preset time period to obtain a power sequence, with each power in the power sequence ordered by the collection time; collecting multiple exhaust temperatures at the exhaust vents of the heat pump dryers over the preset time period; collecting multiple temperatures of the first evaporator over the preset time period; collecting multiple temperatures of the second evaporator over the preset time period; determining the power change trend based on each power; when the power change trend is decreasing and the difference between the first and last power in the power sequence reaches a first preset difference, determining the exhaust temperature change trend, the first evaporator temperature change trend, and the second evaporator temperature change trend; when the exhaust temperature change trend is increasing and the first evaporator temperature change trend is decreasing, determining the system experiencing refrigerant leakage as the first drying system; and when the exhaust temperature change trend is increasing and the second evaporator temperature change trend is decreasing, determining the system experiencing refrigerant leakage as the second drying system.

[0071] Optionally, the control system to be controlled is a first drying system, which includes a first compressor, a first evaporator, a first condenser, and a first electronic expansion valve. The control module is configured to control the control system to perform heating by increasing the frequency of the first compressor according to the difference and correcting the valve opening of the first electronic expansion valve according to the difference, so that the control system to perform heating.

[0072] Optionally, the control module is configured to increase the frequency of the first compressor based on the difference by: determining the quotient between the difference and a preset power threshold; determining the increase frequency of the first compressor based on the quotient and a preset compressor frequency step size; and increasing the frequency of the first compressor based on the increase frequency.

[0073] Optionally, the control module is configured to correct the valve opening of the first electronic expansion valve based on the difference by: determining the quotient between the difference and a preset power threshold; determining the number of steps to increase the valve opening based on the quotient and a preset valve opening step size; and increasing the valve opening of the first electronic expansion valve based on the number of steps.

[0074] Optionally, the control system to be controlled is a second drying system; the second drying system includes a second compressor, a second evaporator, a second condenser, a second electronic expansion valve, a dehumidifying evaporator, and a dehumidifying electronic expansion valve; the dehumidifying evaporator is used to dehumidify the return air of the drying chamber in a controlled manner, and the dehumidifying electronic expansion valve is used to regulate the return air superheat of the dehumidifying evaporator in a controlled manner; the control module is configured to control the heating of the control system to be controlled in the following ways: increasing the frequency of the second compressor according to the difference; adjusting the valve opening of the dehumidifying electronic expansion valve to adjust the refrigerant flow of the dehumidifying electronic expansion valve within a first preset range so that the dehumidifying evaporator cools with a preset return air superheat; correcting the valve opening of the second electronic expansion valve and the dehumidifying electronic expansion valve according to the difference to control the heating of the control system to be controlled.

[0075] Combination Figure 6 As shown, this disclosure provides an apparatus for controlling a heat pump dryer, including a processor 600 and a memory 601. Optionally, the apparatus may further include a communication interface 602 and a bus 603. The processor 600, communication interface 602, and memory 601 can communicate with each other via the bus 603. The communication interface 602 can be used for information transmission. The processor 600 can call logical instructions in the memory 601 to execute the method for controlling the heat pump dryer described in the above embodiment.

[0076] Furthermore, the logic instructions in the aforementioned memory 601 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0077] The memory 601, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 600 executes functional applications and data processing by running the program instructions / modules stored in the memory 601, that is, it implements the method for controlling the heat pump dryer in the above embodiments.

[0078] The memory 601 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 601 may include high-speed random access memory and may also include non-volatile memory.

[0079] The apparatus for controlling a heat pump dryer provided in this embodiment identifies a system in the heat pump dryer where a refrigerant leak has occurred, shuts down the system where the refrigerant leak has occurred, and determines the amount of refrigerant leakage in the system where the refrigerant leak has occurred. If the amount of refrigerant leakage in the system where the refrigerant leak has occurred does not reach a preset leakage amount, the system where no refrigerant leak has occurred is identified as the system to be controlled. Then, the system to be controlled heats the drying chamber to dry the material to be dried. This allows the heat pump dryer to compensate for the heat in the drying chamber even when the leakage amount of the heat pump dryer does not reach the preset leakage amount, thereby continuing the drying process, reducing the probability of the material to be dried deteriorating, ensuring the drying effect, and reducing the user's losses.

[0080] This disclosure provides an electronic device that includes the above-described apparatus for controlling a heat pump dryer.

[0081] Optionally, the electronic device includes a heat pump dryer.

[0082] The electronic device provided in this embodiment identifies a system in the heat pump dryer where a refrigerant leak has occurred, shuts down the system where the refrigerant leak has occurred, and determines the amount of refrigerant leakage in the system where the refrigerant leak has occurred. If the amount of refrigerant leakage in the system where the refrigerant leak has occurred does not reach a preset leakage amount, the system where no refrigerant leak has occurred is identified as the system to be controlled. Then, the system to be controlled heats the drying chamber to dry the material to be dried. This allows the heat pump dryer to compensate for the heat in the drying chamber even when the leakage amount of the heat pump dryer does not reach the preset leakage amount, thereby continuing the drying process, reducing the probability of the material to be dried deteriorating, ensuring the drying effect, and reducing the user's losses.

[0083] This disclosure provides a storage medium storing computer-executable instructions configured to perform the above-described method for controlling a heat pump dryer.

[0084] This disclosure provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions that, when executed by a computer, cause the computer to perform the above-described method for controlling a heat pump dryer.

[0085] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0086] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, including: a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and other media capable of storing program code; it can also be a transient storage medium.

[0087] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0088] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0089] The methods and products disclosed in the embodiments herein (including but not limited to devices and equipment) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to implement this embodiment according to actual needs. In addition, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0090] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A method for controlling a heat pump dryer, the heat pump dryer comprising a first drying system and a second drying system, both the first drying system and the second drying system being used for controlled heating, characterized in that, include: The system in which the refrigerant leak occurred is identified within the first and second drying systems; Shut down the system where the refrigerant leak occurred; Determine the amount of refrigerant leaked from the system where the refrigerant leak occurred; If the refrigerant leakage does not reach the preset leakage amount, the system in which no refrigerant leakage has occurred is identified as the system to be controlled. The system controls the material to be dried to heat it. The first drying system includes a first evaporator, and the second drying system includes a second evaporator. The system in which refrigerant leakage occurs is identified in the first and second drying systems by the following methods: A power sequence is obtained by collecting the power of multiple heat pump dryers within a preset time period. The power in the power sequence is sorted according to the collection time. The discharge temperature of the compressor in the refrigerant circulation system of the heat pump dryer is collected within the preset time period. The temperatures of multiple first evaporators are collected within the preset time period. The temperatures of multiple second evaporators are collected within the preset time period. Determine the trend of power variation based on each of the stated powers; When the power change trend is a downward trend, and the difference between the first power and the last power in the power sequence reaches a first preset difference, the change trend of the exhaust temperature, the change trend of the temperature of the first evaporator, and the change trend of the temperature of the second evaporator are determined. If the exhaust temperature shows an upward trend and the temperature of the first evaporator shows a downward trend, the system in which refrigerant leakage occurs is identified as the first drying system; or, if the exhaust temperature shows an upward trend and the temperature of the second evaporator shows a downward trend, the system in which refrigerant leakage occurs is identified as the second drying system.

2. The method according to claim 1, characterized in that, The system to be controlled is a first drying system, which includes a first compressor, a first evaporator, a first condenser, and a first electronic expansion valve. Controlling the system to be controlled to perform heating includes: The frequency of the first compressor is increased based on the difference, and the valve opening of the first electronic expansion valve is corrected based on the difference, so that the system to be controlled can operate.

3. The method according to claim 2, characterized in that, Increasing the frequency of the first compressor based on the difference includes: Determine the quotient between the difference and the preset power threshold; The increasing frequency of the first compressor is determined based on the quotient and the preset compressor frequency step size; The frequency of the first compressor is increased according to the increased frequency.

4. The method according to claim 2, characterized in that, The valve opening of the first electronic expansion valve is corrected based on the difference, including: Determine the quotient between the difference and the preset power threshold; The number of steps to increase the valve opening is determined based on the quotient and the preset valve opening step size; The valve opening of the first electronic expansion valve is increased according to the number of steps.

5. The method according to claim 1, characterized in that, The system to be controlled is a second drying system; the second drying system includes a second compressor, a second evaporator, a second condenser, a second electronic expansion valve, a dehumidifying evaporator, and a dehumidifying electronic expansion valve; the dehumidifying evaporator is used to dehumidify the return air of the drying chamber in a controlled manner, and the dehumidifying electronic expansion valve is used to regulate the return air superheat of the dehumidifying evaporator in a controlled manner; Controlling the system to be controlled to perform heating includes: The frequency of the second compressor is increased based on the difference. Adjust the valve opening of the dehumidifying electronic expansion valve to regulate the refrigerant flow rate of the dehumidifying electronic expansion valve within a first preset range, so that the dehumidifying evaporator performs refrigeration with a preset return gas superheat; correct the valve opening of the second electronic expansion valve and the dehumidifying electronic expansion valve according to the difference, so as to control the heating of the system to be controlled.

6. An apparatus for controlling a heat pump dryer, the heat pump dryer comprising a first drying system and a second drying system, both the first drying system and the second drying system being used for controlled heating, characterized in that, The apparatus includes the method for controlling a heat pump dryer as described in claim 1, wherein the apparatus comprises: The shutdown module is configured to determine if a refrigerant leak has occurred in the heat pump dryer; and to shut down the system in which the refrigerant leak has occurred. The first determining module is configured to determine the amount of refrigerant leakage in the system where the refrigerant leakage has occurred; The second determining module is configured to determine the system that has not experienced refrigerant leakage as the system to be controlled if the refrigerant leakage amount does not reach the preset leakage amount. The control module is configured to control the system to heat the material to be dried.

7. An apparatus for controlling a heat pump dryer, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute, when running the program instructions, the method for controlling a heat pump dryer as described in any one of claims 1 to 5.

8. An electronic device, characterized in that, Includes the apparatus for controlling a heat pump dryer as described in claim 7.

9. A storage medium storing program instructions, characterized in that, When the program instructions are executed, they perform the method for controlling a heat pump dryer as described in any one of claims 1 to 5.

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