Liquid refrigerant deposition prevention method, liquid refrigerant deposition prevention device, and air conditioner

Abstract

The application discloses a liquid refrigerant deposition prevention method, a liquid refrigerant deposition prevention device and an air conditioner. The method comprises the following steps: acquiring the compressor operating frequency and the outdoor environment temperature when the air conditioner is in refrigeration operation; determining the evaporator temperature information when it is determined that the air conditioner meets the low-frequency operation condition according to the compressor operating frequency and the outdoor environment temperature; and simultaneously reducing the outdoor fan rotating speed and increasing the compressor operating frequency when it is determined that the air conditioner meets the evaporator frosting condition according to the evaporator temperature information. Thus, during the refrigeration operation of the air conditioner, when it is determined that the air conditioner meets the low-frequency operation condition, and when it is determined that the air conditioner meets the evaporator frosting condition according to the evaporator temperature information, the outdoor fan rotating speed is reduced and the compressor operating frequency is increased, which can prevent the liquid refrigerant from being deposited at the bottom of the condenser of the outdoor unit, avoid the partial flow of the vapor-liquid distribution in the evaporator, ensure the uniform distribution of cold and heat at different positions of the evaporator, and effectively prevent the evaporator from frosting.

Description

Technical Field

[0001] This invention relates to the field of air conditioners, and in particular to a method for preventing liquid refrigerant deposition, a device for preventing liquid refrigerant deposition, an air conditioner, an air conditioner controller, and a computer-readable storage medium. Background Technology

[0002] Among related technologies, inverter air conditioners are widely used and have significant energy-saving effects. A major advantage of inverter technology is that when the temperature approaches the set temperature, the inverter air conditioner can automatically reduce its operating frequency and continue to output cooling capacity at a lower frequency to maintain a constant indoor temperature.

[0003] When inverter air conditioners operate at low frequencies, ensuring the reliability of the entire unit and a constant output capacity is crucial. During the development and design of inverter air conditioners, feedback from users in the market revealed that some inverter air conditioners experience weak output and uneven refrigerant flow in the evaporator at low frequencies, leading to uneven heat and cold distribution in different parts of the evaporator and resulting in frost formation on the indoor unit. Extensive experimental verification showed that, due to the larger system size, prolonged low-frequency operation causes a significant amount of liquid refrigerant to accumulate at the bottom of the outdoor unit's condenser. This disrupts the overall refrigerant flow within the inverter air conditioner, affecting its low-frequency output capacity and the refrigerant distribution in the indoor unit. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, one objective of this invention is to provide a method for preventing liquid refrigerant deposition. This method prevents liquid refrigerant from depositing at the bottom of the outdoor unit's condenser, avoids uneven flow of vapor and liquid within the evaporator, ensures uniform heat and cold distribution in different parts of the evaporator, and effectively prevents frost formation on the evaporator.

[0005] The present invention further proposes a device for preventing liquid refrigerant deposition.

[0006] The present invention further proposes an air conditioner.

[0007] The present invention further proposes an air conditioner controller.

[0008] The present invention further proposes a computer-readable storage medium.

[0009] The method for preventing liquid refrigerant deposition according to the present invention, applied in an air conditioner, the method comprising:

[0010] During the cooling operation of the air conditioner, the compressor operating frequency and the outdoor ambient temperature are obtained;

[0011] When the air conditioner meets the low-frequency operation conditions based on the compressor operating frequency and the outdoor ambient temperature, the evaporator temperature information is determined, and when the air conditioner meets the evaporator frosting conditions based on the evaporator temperature information, the outdoor fan speed is reduced and the compressor operating frequency is increased.

[0012] According to the method for preventing liquid refrigerant deposition of the present invention, during the cooling operation of the air conditioner, when the air conditioner meets the low-frequency operation conditions based on the compressor operating frequency and the outdoor ambient temperature, the evaporator temperature information is determined. When the air conditioner meets the evaporator frosting conditions based on the evaporator temperature information, the outdoor fan speed is reduced and the compressor operating frequency is increased. This can prevent liquid refrigerant from depositing at the bottom of the condenser of the outdoor unit, avoid the vapor-liquid separation in the evaporator, ensure uniform heat and cold distribution in different parts of the evaporator, thereby effectively preventing evaporator frosting and improving the air conditioner's low-frequency output capacity.

[0013] In some examples of the present invention, determining that the air conditioner meets the low-frequency operation conditions based on the compressor operating frequency and the outdoor ambient temperature includes:

[0014] When the compressor operating frequency is less than a first preset frequency threshold and the outdoor ambient temperature is less than a first preset temperature, it is determined that the air conditioner meets the low-frequency operation conditions.

[0015] In some examples of the present invention, determining evaporator temperature information includes:

[0016] The evaporator temperature is acquired at preset intervals, and the evaporator temperature change rate is determined based on the evaporator temperature acquired at preset intervals.

[0017] In some examples of the present invention, determining that the air conditioner meets the evaporator frosting conditions based on the evaporator temperature information includes:

[0018] If the currently acquired evaporator temperature is greater than or equal to the previously acquired evaporator temperature, or the evaporator temperature change rate is less than or equal to the first set value, and if the currently acquired evaporator temperature is less than the second preset temperature, then the air conditioner is determined to meet the evaporator frosting condition.

[0019] In some examples of the present invention, after determining the evaporator temperature information, the method further includes:

[0020] When the currently acquired evaporator temperature is lower than the previously acquired evaporator temperature, and the rate of change of the evaporator temperature is greater than a first set value, the outdoor fan speed is reduced.

[0021] In some examples of the present invention, after reducing the outdoor fan speed, the method further includes:

[0022] If the evaporator temperature change rate tends to stabilize, then the outdoor fan is controlled to maintain its current operating speed.

[0023] If the evaporator temperature change rate is greater than the first set value, or the currently obtained evaporator temperature is less than the second preset temperature, then the compressor operating frequency is increased.

[0024] In some examples of the present invention, simultaneously reducing the outdoor fan speed and increasing the compressor operating frequency includes:

[0025] The outdoor fan speed is reduced by a preset step size, while the compressor operating frequency is increased to a second preset frequency threshold, wherein the second preset frequency threshold is greater than the first preset frequency threshold.

[0026] In some examples of the present invention, after reducing the outdoor fan speed by a preset step size, the method further includes:

[0027] If the evaporator temperature change rate is less than or equal to the first set value and the currently acquired evaporator temperature is greater than or equal to the second preset temperature, then the outdoor fan is controlled to maintain its current operating speed.

[0028] If the evaporator temperature change rate is greater than the first set value, or the currently obtained evaporator temperature is less than the second preset temperature, the outdoor fan speed will continue to decrease according to the preset step size until the outdoor fan speed reaches the preset minimum speed.

[0029] The device for preventing liquid refrigerant deposition according to the present invention is applied in an air conditioner, the device comprising:

[0030] The acquisition module is used to acquire the compressor operating frequency and outdoor ambient temperature when the air conditioner is in cooling mode.

[0031] The control module is used to determine the evaporator temperature information when the air conditioner meets the low-frequency operation conditions based on the compressor operating frequency and the outdoor ambient temperature, and to simultaneously reduce the outdoor fan speed and increase the compressor operating frequency when the air conditioner meets the evaporator frosting conditions based on the evaporator temperature information.

[0032] According to the anti-liquid refrigerant deposition device of the present invention, during the cooling operation of the air conditioner, the acquisition module acquires the compressor operating frequency and outdoor ambient temperature, and transmits the acquired compressor operating frequency and outdoor ambient temperature information to the control module. The control module determines the evaporator temperature information when the air conditioner meets the low-frequency operation conditions based on the compressor operating frequency and outdoor ambient temperature. When the control module determines the evaporator frosting conditions based on the evaporator temperature information, the control module controls the air conditioner to reduce the outdoor fan speed and increase the compressor operating frequency. This can prevent liquid refrigerant from depositing at the bottom of the condenser of the outdoor unit, avoid the vapor-liquid separation in the evaporator, ensure uniform heat and cold distribution in different parts of the evaporator, thereby effectively preventing evaporator frosting and improving the air conditioner's low-frequency output capacity.

[0033] An air conditioner according to the present invention includes:

[0034] The compressor, evaporator, condenser, and throttling element are provided. The condenser includes multiple piping assemblies, each of which includes a first set of piping and a second set of piping. The first set of piping has multiple first piping connected in series to form a first refrigerant flow path. The second set of piping has multiple second piping and multiple third piping. The multiple second piping are connected in series to form a second refrigerant flow path and are arranged in a first column. The multiple third piping are connected in series to form a third refrigerant flow path and are arranged in a second column. One of the second piping located at the end of the second piping in the first column is connected to a third piping in the second column that is away from it, so that the second refrigerant flow path and the third refrigerant flow path are connected in series.

[0035] The controller is configured to acquire the compressor operating frequency and outdoor ambient temperature when the air conditioner is running in cooling mode, and determine the evaporator temperature information when the air conditioner meets the low-frequency operation conditions based on the compressor operating frequency and outdoor ambient temperature, and simultaneously reduce the outdoor fan speed and increase the compressor operating frequency when the air conditioner meets the evaporator frosting conditions based on the evaporator temperature information.

[0036] According to the air conditioner of the present invention, during the cooling operation of the air conditioner, the compressor operating frequency and outdoor ambient temperature are acquired. When the air conditioner meets the low-frequency operation conditions based on the compressor operating frequency and outdoor ambient temperature, the evaporator temperature information is determined. When the air conditioner meets the evaporator frosting conditions based on the evaporator temperature information, the air conditioner is controlled to reduce the outdoor fan speed and increase the compressor operating frequency. This can prevent liquid refrigerant from depositing at the bottom of the condenser of the outdoor unit, avoid the vapor-liquid separation in the evaporator, ensure uniform heat and cold distribution in different parts of the evaporator, thereby effectively preventing evaporator frosting and improving the air conditioner's low-frequency output capacity.

[0037] The air conditioner controller according to the present invention includes a memory, a processor, and an anti-liquid refrigerant deposition program stored in the memory and executable on the processor. When the processor executes the anti-liquid refrigerant deposition program, it implements the above-described anti-liquid refrigerant deposition method.

[0038] According to the air conditioner controller of the present invention, when the processor executes the anti-liquid refrigerant deposition program, during the air conditioner's cooling operation, when the air conditioner meets the low-frequency operation conditions based on the compressor operating frequency and the outdoor ambient temperature, the evaporator temperature information is determined. When the air conditioner meets the evaporator frosting conditions based on the evaporator temperature information, the outdoor fan speed is reduced and the compressor operating frequency is increased. This can prevent liquid refrigerant from depositing at the bottom of the outdoor unit's condenser, avoid vapor-liquid flow deviation in the evaporator, ensure uniform heat and cold distribution in different parts of the evaporator, thereby effectively preventing evaporator frosting and improving the air conditioner's low-frequency output capacity.

[0039] According to the present invention, a computer-readable storage medium thereon stores a liquid refrigerant deposition prevention program, which, when executed by a processor, implements the above-described liquid refrigerant deposition prevention method.

[0040] According to the computer-readable storage medium of the present invention, when the anti-liquid refrigerant deposition program is executed by the processor, during the cooling operation of the air conditioner, when it is determined that the air conditioner meets the low-frequency operation conditions based on the compressor operating frequency and the outdoor ambient temperature, the evaporator temperature information is determined. When it is determined that the air conditioner meets the evaporator frosting conditions based on the evaporator temperature information, the outdoor fan speed is reduced and the compressor operating frequency is increased. This can prevent liquid refrigerant from depositing at the bottom of the condenser of the outdoor unit, avoid the vapor-liquid separation in the evaporator, ensure uniform heat and cold distribution in different parts of the evaporator, thereby effectively preventing evaporator frosting and improving the air conditioner's low-frequency output capacity.

[0041] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0042] Figure 1 This is a flowchart of a method for preventing liquid refrigerant deposition according to an embodiment of the present invention;

[0043] Figure 2 This is a block diagram of the acquisition module and control module of the anti-liquid refrigerant deposition device according to an embodiment of the present invention;

[0044] Figure 3 This is a flowchart of a specific embodiment of the method for preventing liquid refrigerant deposition according to an embodiment of the present invention;

[0045] Figure 4This is a block diagram of a processor, memory, communication interface, and communication bus according to an embodiment of the present invention;

[0046] Figure 5 This is a schematic diagram of a piping assembly according to an embodiment of the present invention.

[0047] Figure label:

[0048] 10; 11; 12; 10; 10; 11; 12;

[0049] Piping assembly 20;

[0050] First set of pipes 21; First pipe 211; First refrigerant flow path 212;

[0051] Second set of pipes 22; Second pipe 221; Third pipe 222; Second refrigerant flow path 223; Third refrigerant flow path 224;

[0052] 30. First import; 31. First export; 32. Second import; 33. Second total export; 34. Third import; 35. Third export; 36. Fourth import; 37. Fourth export; 38. Second total export; 39. First total import; 391. Fifth export; 392. Second total import; 393. Sixth export; 394. Total export; 395.

[0053] Processor 1201; Communication interface 1202; Memory 1203; Communication bus 1204. Detailed Implementation

[0054] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0055] The following describes a method for preventing liquid refrigerant deposition according to an embodiment of the present invention, which is applied in an air conditioner, with reference to the accompanying drawings.

[0056] like Figure 1 As shown, the method for preventing liquid refrigerant deposition according to an embodiment of the present invention includes the following steps:

[0057] S100: During the cooling operation of the air conditioner, obtain the compressor operating frequency and the outdoor ambient temperature.

[0058] It should be noted that the air conditioner can be equipped with an acquisition module, which can acquire the compressor operating frequency and the outdoor ambient temperature when the air conditioner is in cooling mode.

[0059] S200: When the air conditioner meets the low-frequency operation conditions based on the compressor operating frequency and the outdoor ambient temperature, the evaporator temperature information is determined. When the air conditioner meets the evaporator frosting conditions based on the evaporator temperature information, the outdoor fan speed is reduced and the compressor operating frequency is increased.

[0060] It should be noted that the air conditioner may be equipped with a control module. The control module is connected to the acquisition module. The acquisition module can transmit the acquired compressor operating frequency and outdoor ambient temperature information to the control module. When the control module determines that the air conditioner meets the low-frequency operation conditions based on the compressor operating frequency and outdoor ambient temperature, the control module determines the evaporator temperature information. When the control module determines that the air conditioner meets the evaporator frosting conditions based on the evaporator temperature information, the control module controls the air conditioner to reduce the outdoor fan speed and increase the compressor operating frequency.

[0061] The system detects the air conditioner's operating mode after it is turned on. When the air conditioner is operating in heating mode, the detection continues. When it detects that the air conditioner is operating in cooling mode, the acquisition module obtains the compressor's operating frequency and the outdoor ambient temperature. This information is then transmitted to the control module. Based on these parameters, the control module determines that when the air conditioner meets low-frequency operating conditions, there is a probability of liquid refrigerant deposition, which could potentially cause flow deviation and evaporator frosting. The control module further determines the evaporator temperature and, if the air conditioner meets the evaporator frosting conditions, controls the air conditioner to reduce the outdoor fan speed and increase the compressor's operating frequency, increasing the outdoor unit's pressure. This increases the overall system pressure ratio, thereby increasing the refrigerant flow rate within the system. This prevents liquid refrigerant deposition at the bottom of the outdoor unit's condenser, avoids flow deviation in the evaporator, and ensures uniform heat and cold distribution in different parts of the evaporator. This effectively prevents evaporator frosting and improves the air conditioner's low-frequency output, resulting in improved energy efficiency.

[0062] Therefore, during the cooling operation of the air conditioner, when the air conditioner meets the low-frequency operation conditions based on the compressor operating frequency and the outdoor ambient temperature, the evaporator temperature information is determined. When the air conditioner meets the evaporator frosting conditions based on the evaporator temperature information, the outdoor fan speed is reduced and the compressor operating frequency is increased. This can prevent liquid refrigerant from depositing at the bottom of the outdoor unit's condenser, avoid the vapor-liquid separation in the evaporator, ensure uniform heat and cold distribution in different parts of the evaporator, effectively prevent evaporator frosting, and thus improve the air conditioner's low-frequency output capacity.

[0063] In some embodiments of the present invention, determining whether the air conditioner meets the low-frequency operation conditions based on the compressor operating frequency and the outdoor ambient temperature may include: determining that the air conditioner meets the low-frequency operation conditions when the compressor operating frequency is less than a first preset frequency threshold and the outdoor ambient temperature is less than a first preset temperature. The first preset frequency threshold can be set to 35Hz-45Hz, preferably 40Hz, and the first preset temperature can be set to 25℃-35℃, preferably 30℃. The specific values ​​of the first preset frequency threshold and the first preset temperature can be selected according to the specific usage of the air conditioner. When the acquisition module obtains that the compressor operating frequency is less than the first preset frequency threshold and the outdoor ambient temperature is less than the first preset temperature, the control module determines that the air conditioner meets the low-frequency operation conditions. At this time, there is a probability of liquid refrigerant deposition, which may cause flow deviation and evaporator frosting. This setting can achieve the effect of determining whether the air conditioner meets the low-frequency operation conditions. It should be noted that when the compressor operating frequency is greater than the first preset frequency threshold, subsequent determination is temporarily suspended, and the acquisition module continues to obtain the compressor operating frequency. Alternatively, if the outdoor ambient temperature is higher than the first preset temperature, the subsequent judgment will not be executed temporarily, and the acquisition module will continue to acquire the outdoor ambient temperature.

[0064] In some embodiments of the present invention, determining the evaporator temperature information may include: acquiring the evaporator temperature at preset time intervals and determining the evaporator temperature change rate based on the evaporator temperature acquired at each preset time interval. Further, the preset time can be set to 10s-30s, for example, 20s. When the acquisition module acquires that the compressor operating frequency is less than a first preset frequency threshold and the outdoor ambient temperature is less than a first preset temperature, the system assumes there is a probability of liquid refrigerant deposition, which may cause flow deviation and evaporator frosting. Therefore, further determination is made, and in the following period (e.g., 5 minutes), the acquisition module continues to acquire the evaporator temperature at preset time intervals and determines the evaporator temperature change rate based on the evaporator temperature acquired at each preset time interval. The evaporator temperature change rate is calculated as P = (T... N+1 -T N ) / t, where t is the preset time, T N+1 and T N This indicates the evaporator temperature values ​​from two consecutive measurements. This setting enables the technical effect of determining evaporator temperature information, allowing the control module to accurately determine whether the air conditioner meets the evaporator frosting conditions.

[0065] In some embodiments of the present invention, determining that the air conditioner meets the evaporator frosting condition based on evaporator temperature information may include: if the currently acquired evaporator temperature is greater than or equal to the previously acquired evaporator temperature, or the evaporator temperature change rate is less than or equal to a first set value, and if the currently acquired evaporator temperature is less than a second preset temperature, then the air conditioner is determined to meet the evaporator frosting condition. The first set value may be set to 2°C / min, and the second preset temperature may be set to 3°C, but the present invention is not limited thereto; the values ​​of the first set value and the second preset temperature can be specifically selected according to actual conditions. When the currently acquired evaporator temperature is greater than or equal to the previously acquired evaporator temperature, or when the evaporator temperature change rate is less than or equal to the first set value, the evaporator temperature is detected. If the currently acquired evaporator temperature is less than the second preset temperature, the system determines that the probability of frosting is at its highest level, and the air conditioner directly enters revision mode. This reduces the outdoor fan speed and increases the compressor operating frequency, thereby increasing the outdoor unit side pressure. This increases the pressure ratio of the entire air conditioner system, thereby increasing the refrigerant flow rate within the entire system. This prevents liquid refrigerant from depositing at the bottom of the outdoor unit's condenser, avoids vapor-liquid separation in the evaporator, and ensures uniform heat and cold distribution in different parts of the evaporator. This effectively prevents evaporator frosting, thereby improving the air conditioner's low-frequency output capacity and effectively enhancing its energy efficiency.

[0066] In some embodiments of the present invention, after determining the evaporator temperature information, the method for preventing liquid refrigerant deposition may further include: after determining the evaporator temperature information, when the currently acquired evaporator temperature is lower than the previously acquired evaporator temperature and the evaporator temperature change rate is greater than a first set value, reducing the outdoor fan speed. Wherein, after determining the evaporator temperature information, when the currently acquired evaporator temperature is lower than the previously acquired evaporator temperature and the evaporator temperature change rate is greater than the first set value, the probability of frosting is further increased. At this time, the air conditioner will enter a preventative mode in advance, reducing the outdoor fan speed and increasing the outdoor unit side pressure, thereby increasing the pressure ratio of the entire air conditioner system, thereby increasing the refrigerant flow rate within the entire air conditioner system, preventing liquid refrigerant from depositing at the bottom of the outdoor unit's condenser, avoiding vapor-liquid flow deviation within the evaporator, ensuring uniform heat and cold distribution in different parts of the evaporator, thereby effectively preventing evaporator frosting, and further improving the air conditioner's low-frequency output capacity, thus effectively improving the air conditioner's energy efficiency.

[0067] In some embodiments of the present invention, after reducing the outdoor fan speed, the method for preventing liquid refrigerant deposition may further include: if the evaporator temperature change rate tends to stabilize, controlling the outdoor fan to maintain its current operating speed; if the evaporator temperature change rate is greater than a first set value, or the currently obtained evaporator temperature is less than a second preset temperature, increasing the compressor operating frequency. Here, "evaporator temperature change rate tends to stabilize" means that the evaporator temperature change rate is within a preset value range, which is specifically selected according to actual conditions. After reducing the outdoor fan speed, the air conditioner enters a preventative mode. After reducing the outdoor fan speed, if the evaporator temperature change rate tends to stabilize, controlling the outdoor fan to maintain its current operating speed until the operating mode changes or the ambient temperature changes. If the evaporator temperature change rate is greater than the first set value (e.g., 2℃ / min), or the currently acquired evaporator temperature is less than the second preset temperature (e.g., 3℃), it is considered that the action of reducing the outdoor fan speed in the prevention mode is insufficient to support the change in the system operating state. In this case, the system enters the revision mode, increases the compressor operating frequency, and increases the outdoor unit side pressure. This increases the pressure ratio of the entire air conditioner system, thereby increasing the refrigerant flow rate within the entire air conditioner system. This prevents liquid refrigerant from depositing at the bottom of the outdoor unit's condenser, avoids the vapor-liquid separation in the evaporator, and ensures uniform heat and cold distribution in different parts of the evaporator. This effectively prevents evaporator frosting and improves the air conditioner's low-frequency capacity output, thus effectively improving the air conditioner's energy efficiency.

[0068] In some embodiments of the present invention, simultaneously reducing the outdoor fan speed and increasing the compressor operating frequency may include: reducing the outdoor fan speed by a preset step size while simultaneously increasing the compressor operating frequency to a second preset frequency threshold, wherein the second preset frequency threshold is greater than a first preset frequency threshold. It should be noted that reducing the outdoor fan speed by a preset step size can mean reducing the outdoor fan speed by 20%-40% of the current outdoor fan speed, with each reduction being 20%-40% of the current outdoor fan speed. The second preset frequency threshold can be 50Hz. This setting ensures that the outdoor fan speed decreases appropriately each time and also ensures that the compressor operating frequency is increased to a suitable frequency. This further increases the pressure on the outdoor unit side, thereby increasing the pressure ratio of the entire air conditioning system, further increasing the refrigerant flow rate within the entire air conditioning system, further preventing liquid refrigerant from depositing at the bottom of the outdoor unit's condenser, further avoiding vapor-liquid flow deviation in the evaporator, further ensuring uniform heat and cold distribution in different parts of the evaporator, thus more effectively preventing evaporator frosting, and further improving the air conditioner's low-frequency output capacity, effectively improving the air conditioner's energy efficiency.

[0069] In some embodiments of the present invention, after reducing the outdoor fan speed by a preset step size, the method for preventing liquid refrigerant deposition may further include: if the evaporator temperature change rate is less than or equal to a first preset value (e.g., 2°C / min) and the currently acquired evaporator temperature is greater than or equal to a second preset temperature (e.g., 3°C), then the outdoor fan is controlled to maintain its current operating speed until the air conditioner's operating mode changes or the outdoor ambient temperature changes. This setting effectively ensures that liquid refrigerant does not deposit at the bottom of the outdoor unit's condenser, further ensuring uniform heat and cold distribution in different parts of the evaporator, thereby more effectively preventing evaporator frosting.

[0070] The following is based on Figure 3 A detailed description of the method for preventing liquid refrigerant deposition according to embodiments of the present invention is provided, the method comprising the following steps:

[0071] S101, Control the air conditioner to turn on;

[0072] S102. Detect the operating mode of the air conditioner. If the air conditioner is working in heating mode, execute step S103. If the air conditioner is working in cooling mode, execute step S104.

[0073] S103, without obtaining the compressor operating frequency and outdoor ambient temperature;

[0074] S104. Obtain the real-time operating frequency of the compressor. If the compressor operating frequency is greater than the first preset frequency threshold (e.g., 40Hz), proceed to step S105. If the compressor operating frequency is less than the first preset frequency threshold (e.g., 40Hz), proceed to step S106.

[0075] S105. Continue to obtain the real-time operating frequency of the compressor, and temporarily suspend subsequent judgments;

[0076] S106. Obtain the outdoor ambient temperature. If the outdoor ambient temperature is greater than the first preset temperature (e.g., 30°C), proceed to step S107. If the outdoor ambient temperature is less than the first preset temperature (e.g., 30°C), proceed to step S108.

[0077] S107. Continue to acquire the outdoor ambient temperature, and temporarily suspend subsequent judgments;

[0078] S108. When the compressor operating frequency is less than the first preset frequency threshold and the outdoor ambient temperature is less than the first preset temperature, the air conditioner system will assume that under these operating conditions, there is a probability of liquid refrigerant deposition, which may cause flow deviation and evaporator frosting. Further judgment is made by acquiring the evaporator temperature every preset time interval (10s-30s) for the next 5 minutes and calculating the evaporator temperature change rate P in real time. If P > 2℃ / min, and T... N+1-T N <0, proceed to step S109. If P > 2℃ / min and T N+1 -T N <0 is not satisfied simultaneously, proceed to step S110;

[0079] S109. The system of the air conditioner determines that the probability of frost formation has increased further. At this time, it will enter the prevention mode in advance and execute step S111.

[0080] S110. Continue to detect the evaporator temperature. If the evaporator temperature is less than the second preset temperature (3°C), the system determines that the probability of frosting is the highest level, and the air conditioner directly enters the revision mode and executes step S112. If the evaporator temperature is greater than or equal to the second preset temperature, execute step S117.

[0081] S111. Enter the prevention mode and reduce the outdoor fan speed by 20%-40% according to the preset step size. The purpose of this action is to reduce the speed and increase the outdoor side pressure, thereby increasing the pressure ratio of the entire air conditioning system, increasing the system refrigerant flow rate, and eliminating the phenomenon of liquid refrigerant deposition. Then, proceed to step S113.

[0082] S112. After entering the revision mode, if the prevention mode has been entered before, the compressor operating frequency will be further increased to the second preset frequency threshold (e.g., 50Hz) on the basis of reducing the outdoor fan speed. If the revision mode is entered directly, the outdoor fan speed will be reduced and the compressor operating frequency will be increased to the second preset frequency threshold. After the above actions are performed, step S114 will be executed.

[0083] S113. If the evaporator temperature change rate tends to stabilize, and T also tends to stabilize (e.g., T0) N+1 -T N If the absolute value range is 0-0.5 (indicating that T tends to be stable), then the default operating state remains unchanged until the operating mode changes or the ambient temperature changes. After executing this program, if P > 2℃ / min or the evaporator temperature is less than the second preset temperature (3℃), then it is considered that the action of reducing the outdoor fan speed in the prevention mode is insufficient to support the change in the system operating state, and then enter the revision mode and execute step S112.

[0084] S114. Continuously monitor the evaporator temperature change rate P and the evaporator temperature T. If the evaporator temperature change rate is less than or equal to the first set value and the evaporator temperature is greater than or equal to the second preset temperature, execute step S115. If the evaporator temperature change rate is greater than the first set value or the currently acquired evaporator temperature is less than the second preset temperature, execute step S116.

[0085] S115. Control the outdoor fan to maintain its current operating speed until the air conditioner's operating mode changes or the outdoor ambient temperature changes;

[0086] S116. Further reduce the outdoor fan speed according to the preset step size until the evaporator temperature change rate is less than or equal to the first set value and the evaporator temperature is greater than or equal to the second preset temperature, or until the outdoor fan speed drops to the minimum speed. If the outdoor fan speed drops to the minimum speed but still does not meet the requirement that the evaporator temperature change rate is less than or equal to the first set value and the evaporator temperature is greater than or equal to the second preset temperature, execute step S118.

[0087] S117. Continue to monitor the evaporator temperature and do not perform other actions until the evaporator temperature is greater than or equal to the second preset temperature.

[0088] S118, Shutdown.

[0089] like Figure 2 As shown, the anti-liquid refrigerant deposition device 10 according to an embodiment of the present invention is applied in an air conditioner. The anti-liquid refrigerant deposition device 10 can implement the anti-liquid refrigerant deposition method in the above embodiment. The anti-liquid refrigerant deposition device 10 includes: an acquisition module 11 and a control module 12. The acquisition module 11 is used to acquire the compressor operating frequency and the outdoor ambient temperature when the air conditioner is running in cooling mode. The control module 12 is used to determine the evaporator temperature information when the air conditioner meets the low-frequency operation conditions based on the compressor operating frequency and the outdoor ambient temperature, and simultaneously reduce the outdoor fan speed and increase the compressor operating frequency when the air conditioner meets the evaporator frosting conditions based on the evaporator temperature information.

[0090] It should be noted that the control module 12 is communicatively connected to the acquisition module 11. The acquisition module 11 can transmit the acquired compressor operating frequency and outdoor ambient temperature information to the control module 12. When the control module 12 determines that the air conditioner meets the low-frequency operation conditions based on the compressor operating frequency and outdoor ambient temperature, the control module 12 determines the evaporator temperature information. When the control module 12 determines that the air conditioner meets the evaporator frosting conditions based on the evaporator temperature information, the control module 12 controls the air conditioner to reduce the outdoor fan speed and increase the compressor operating frequency.

[0091] The system detects the air conditioner's operating mode after it is turned on. If the air conditioner is operating in heating mode, the system continues to detect the operating mode. When the air conditioner is detected to be operating in cooling mode, module 11 acquires the compressor operating frequency and the outdoor ambient temperature. The acquisition module 11 transmits the acquired compressor operating frequency and outdoor ambient temperature information to the control module 12. Based on the compressor operating frequency and outdoor ambient temperature, the control module 12 determines that when the air conditioner meets the low-frequency operation conditions, there is a probability of liquid refrigerant deposition, which may cause flow deviation and evaporator frosting. The control module 12 further determines the evaporator temperature information and, based on this information, determines that the air conditioner meets the evaporator frosting conditions. The control module 12 then controls the air conditioner to reduce the outdoor fan speed and increase the compressor operating frequency, increasing the outdoor unit side pressure. This increases the pressure ratio of the entire air conditioner system, thereby increasing the refrigerant flow rate within the system. This prevents liquid refrigerant deposition at the bottom of the outdoor unit's condenser, avoids flow deviation in the evaporator, and ensures uniform heat and cold distribution in different parts of the evaporator. This effectively prevents evaporator frosting, thereby improving the air conditioner's low-frequency output capacity and effectively enhancing its energy efficiency.

[0092] like Figure 5 As shown, an air conditioner according to an embodiment of the present invention includes: a compressor, an evaporator, a condenser, a controller, and a throttling element. The controller is used to acquire the compressor operating frequency and the outdoor ambient temperature during air conditioner cooling operation, and to determine the evaporator temperature information when the air conditioner meets low-frequency operation conditions based on the compressor operating frequency and the outdoor ambient temperature, and to simultaneously reduce the outdoor fan speed and increase the compressor operating frequency when the air conditioner meets evaporator frosting conditions based on the evaporator temperature information.

[0093] Specifically, during the cooling operation of the air conditioner, the compressor operating frequency and outdoor ambient temperature are acquired. Based on the compressor operating frequency and outdoor ambient temperature, when the air conditioner meets the low-frequency operation conditions, the evaporator temperature information is determined. Based on the evaporator temperature information, when the air conditioner meets the evaporator frosting conditions, the outdoor fan speed is reduced and the compressor operating frequency is increased. This prevents liquid refrigerant from depositing at the bottom of the outdoor unit's condenser, avoids uneven flow of vapor and liquid in the evaporator, and ensures uniform heat and cold distribution in different parts of the evaporator. This effectively prevents evaporator frosting and improves the air conditioner's low-frequency output capacity.

[0094] like Figure 5As shown, the condenser includes multiple piping assemblies 20. Each piping assembly 20 includes a first set of piping 21 and a second set of piping 22. The first set of piping 21 has multiple first pipes 211 connected in series to form a first refrigerant flow path 212. The second set of piping 22 has multiple second pipes 221 and multiple third pipes 222 connected in series to form a second refrigerant flow path 223 and arranged in a first column. The multiple third pipes 222 are connected in series to form a third refrigerant flow path 224 and arranged in a second column. One of the second pipes 221 at the end of the first column of second pipes 221 is connected to a third pipe 222 in the second column of third pipes 222 that is away from it, so that the second refrigerant flow path 223 and the third refrigerant flow path 224 are connected in series.

[0095] Furthermore, such as Figure 5 As shown, taking a configuration of three pipe assemblies 20 as an example, the three pipe assemblies 20 are arranged in the following order: first group pipe 21, second group pipe 22, first group pipe 21, second group pipe 22, first group pipe 21, second group pipe 22. The first pipe 211, the second pipe 221, and the third pipe 222 are all U-shaped pipes, as shown... Figure 5 As shown, in the first group of pipes 21, multiple first pipes 211 are connected in series to form a first refrigerant flow path 212. In the second pipe 221, one of the second pipes 221 located at the end is connected to the third pipe 222 in the second column of third pipes 222 that is far away from it, thereby connecting the second refrigerant flow path 223 and the third refrigerant flow path 224 in series to form a Z-shaped refrigerant flow path.

[0096] Furthermore, the first set of pipes 21 of a pipe assembly 20 located at the end has a first inlet 30 and a first outlet 31, and the second set of pipes 22 has a second inlet 32 ​​and a second outlet 33. The first outlet 31 and the second outlet 33 are connected to form a first combined outlet 34. The first set of pipes 21 of the pipe assembly 20 located in the middle has a third inlet 35 and a third outlet 36. The second set of pipes 22 of the pipe assembly 20 located in the middle has a fourth inlet 37 and a fourth outlet 38. The third outlet 36 and the fourth outlet 38 are connected to form a second combined outlet 39. The first set of pipes 21 of another pipe assembly 20 located at the end has a first combined inlet 391 and a fifth outlet 392. The second set of pipes 22 of another pipe assembly 20 located at the end has a second combined inlet 393 and a sixth outlet 394. The first combined outlet 34 is connected to the first combined inlet 391, the second combined outlet 39 is connected to the second combined inlet 393, and the fifth outlet 392 and the sixth outlet 394 are connected to form a total outlet 395. The total outlet 395 is connected to a throttling element.

[0097] The first outlet 31 is connected to the second outlet 33 to form a first combined outlet 34, which is connected to the first combined inlet. This increases the refrigerant flow rate at the lower end of the condenser, thereby increasing the subcooling of the refrigerant at the end of the condenser, improving the evaporation effect after throttling, and ultimately improving the energy efficiency of the air conditioner under low-frequency and low-operation conditions. Furthermore, the arrangement of the multiple pipe components 20 in this application prevents liquid refrigerant from easily depositing at the lower end of the condenser, mitigating the phenomenon of liquid refrigerant deposition within the condenser, avoiding vapor-liquid separation within the evaporator, ensuring uniform heat and cold distribution in different parts of the evaporator, and effectively preventing frost formation on the evaporator.

[0098] An air conditioner controller according to an embodiment of the present invention includes a memory, a processor, and an anti-liquid refrigerant deposition program stored in the memory and executable on the processor. When the processor executes the anti-liquid refrigerant deposition program, it implements the anti-liquid refrigerant deposition method of the above embodiment.

[0099] According to the air conditioner controller of the present invention, when the processor executes the anti-liquid refrigerant deposition program, during the air conditioner's cooling operation, when it is determined that the air conditioner meets the low-frequency operation conditions based on the compressor operating frequency and the outdoor ambient temperature, the evaporator temperature information is determined. When it is determined that the air conditioner meets the evaporator frosting conditions based on the evaporator temperature information, the outdoor fan speed is reduced and the compressor operating frequency is increased. This can prevent liquid refrigerant from depositing at the bottom of the outdoor unit's condenser, avoid the vapor-liquid separation in the evaporator, ensure uniform heat and cold distribution in different parts of the evaporator, thereby effectively preventing evaporator frosting and improving the air conditioner's low-frequency output capacity.

[0100] like Figure 4 As shown, a computer-readable storage medium according to an embodiment of the present invention stores an anti-liquid refrigerant deposition program thereon. When the anti-liquid refrigerant deposition program is executed by the processor 1201, it implements the anti-liquid refrigerant deposition method of the above embodiment. When the anti-liquid refrigerant deposition program is executed by the processor 1201, during the cooling operation of the air conditioner, when it is determined that the air conditioner meets the low-frequency operation conditions based on the compressor operating frequency and the outdoor ambient temperature, the evaporator temperature information is determined. When it is determined that the air conditioner meets the evaporator frosting conditions based on the evaporator temperature information, the outdoor fan speed is reduced and the compressor operating frequency is increased. This can prevent liquid refrigerant from depositing at the bottom of the condenser of the outdoor unit, avoid the vapor-liquid separation in the evaporator, ensure uniform heat and cold distribution in different parts of the evaporator, thereby effectively preventing evaporator frosting and improving the low-frequency output capacity of the air conditioner.

[0101] like Figure 4As shown, the computer-readable storage medium includes at least one processor 1201, at least one communication interface 1202, at least one memory 1203, and at least one communication bus 1204. In embodiments of the present invention, the number of processor 1201, communication interface 1202, memory 1203, and communication bus 1204 is at least one, and the processor 1201, communication interface 1202, and memory 1203 communicate with each other through the communication bus 1204.

[0102] The memory 1203 may be, but is not limited to, Random Access Memory (RAM), Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), etc. The memory 1203 stores the program, and after receiving the execution instruction, the processor 1201 executes the program to implement the steps of the air conditioning control method described in the above embodiments.

[0103] Processor 1201 may be an integrated circuit chip with signal processing capabilities. The aforementioned processor can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it can also be a Digital Signal Processor (DSP), an Application-Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this invention. The general-purpose processor can be a microprocessor or any conventional processor.

[0104] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0105] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0106] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0107] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0108] Furthermore, the terms "first," "second," etc., used in the embodiments of this invention are for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of technical features indicated in this embodiment. Therefore, features defined with terms such as "first" and "second" in the embodiments of this invention can explicitly or implicitly indicate that the embodiment includes at least one of those features. In the description of this invention, the word "multiple" means at least two or more, such as two, three, four, etc., unless otherwise explicitly specified in the embodiments.

[0109] In this invention, unless otherwise explicitly specified or limited in the embodiments, the terms "installation," "connection," "joining," and "fixing" appearing in the embodiments should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can also be a mechanical connection, an electrical connection, etc. Of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components, or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific implementation.

[0110] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0111] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for preventing liquid refrigerant deposition, characterized in that, When applied to air conditioners, the method includes: During the cooling operation of the air conditioner, the compressor operating frequency and the outdoor ambient temperature are obtained; When the air conditioner meets the low-frequency operation conditions based on the compressor operating frequency and the outdoor ambient temperature, the evaporator temperature information is determined. Based on the evaporator temperature information, when the air conditioner meets the evaporator frosting conditions, the outdoor fan speed is reduced and the compressor operating frequency is increased. Specifically, the evaporator temperature is acquired at preset intervals, and the evaporator temperature change rate is determined based on the evaporator temperature acquired at preset intervals. If the currently acquired evaporator temperature is greater than or equal to the previously acquired evaporator temperature, or the evaporator temperature change rate is less than or equal to a first set value, and if the currently acquired evaporator temperature is less than a second preset temperature, then the air conditioner is determined to meet the evaporator frosting condition.

2. The method according to claim 1, characterized in that, Determining whether the air conditioner meets the low-frequency operation conditions based on the compressor's operating frequency and the outdoor ambient temperature includes: When the compressor operating frequency is less than a first preset frequency threshold and the outdoor ambient temperature is less than a first preset temperature, it is determined that the air conditioner meets the low-frequency operation conditions.

3. The method according to claim 2, characterized in that, After determining the evaporator temperature information, the method further includes: When the currently acquired evaporator temperature is lower than the previously acquired evaporator temperature, and the rate of change of the evaporator temperature is greater than a first set value, the outdoor fan speed is reduced.

4. The method according to claim 3, characterized in that, After reducing the outdoor fan speed, the method further includes: If the evaporator temperature change rate tends to stabilize, then the outdoor fan is controlled to maintain its current operating speed. If the evaporator temperature change rate is greater than the first set value, or the currently obtained evaporator temperature is less than the second preset temperature, then the compressor operating frequency is increased.

5. The method according to claim 2, characterized in that, Simultaneously reducing the outdoor fan speed and increasing the compressor operating frequency includes: The outdoor fan speed is reduced by a preset step size, while the compressor operating frequency is increased to a second preset frequency threshold, wherein the second preset frequency threshold is greater than the first preset frequency threshold.

6. The method according to claim 5, characterized in that, After reducing the outdoor fan speed by a preset step size, the method further includes: If the evaporator temperature change rate is less than or equal to the first set value and the currently acquired evaporator temperature is greater than or equal to the second preset temperature, then the outdoor fan is controlled to maintain its current operating speed. If the evaporator temperature change rate is greater than the first set value, or the currently obtained evaporator temperature is less than the second preset temperature, the outdoor fan speed will continue to decrease according to the preset step size until the outdoor fan speed reaches the preset minimum speed.

7. A device for preventing liquid refrigerant deposition, characterized in that, The device, used in air conditioners, includes: The acquisition module is used to acquire the compressor operating frequency and outdoor ambient temperature when the air conditioner is in cooling mode. The control module is used to determine the evaporator temperature information when the air conditioner meets the low-frequency operation conditions based on the compressor operating frequency and the outdoor ambient temperature, and to simultaneously reduce the outdoor fan speed and increase the compressor operating frequency when the air conditioner meets the evaporator frosting conditions based on the evaporator temperature information. Specifically, the evaporator temperature is acquired at preset intervals, and the evaporator temperature change rate is determined based on the evaporator temperature acquired at preset intervals. If the currently acquired evaporator temperature is greater than or equal to the previously acquired evaporator temperature, or the evaporator temperature change rate is less than or equal to a first set value, and if the currently acquired evaporator temperature is less than a second preset temperature, then the air conditioner is determined to meet the evaporator frosting condition.

8. An air conditioner, characterized in that, include: The compressor, evaporator, condenser, and throttling element are provided. The condenser includes multiple piping assemblies, each of which includes a first set of piping and a second set of piping. The first set of piping has multiple first piping connected in series to form a first refrigerant flow path. The second set of piping has multiple second piping and multiple third piping. The multiple second piping are connected in series to form a second refrigerant flow path and are arranged in a first column. The multiple third piping are connected in series to form a third refrigerant flow path and are arranged in a second column. One of the second piping located at the end of the second piping in the first column is connected to a third piping in the second column that is away from it, so that the second refrigerant flow path and the third refrigerant flow path are connected in series. The controller is used to acquire the compressor operating frequency and outdoor ambient temperature when the air conditioner is running in cooling mode, and determine the evaporator temperature information when the air conditioner meets the low-frequency operation conditions based on the compressor operating frequency and outdoor ambient temperature, and simultaneously reduce the outdoor fan speed and increase the compressor operating frequency when the air conditioner meets the evaporator frosting conditions based on the evaporator temperature information. Specifically, the evaporator temperature is acquired at preset intervals, and the evaporator temperature change rate is determined based on the evaporator temperature acquired at preset intervals. If the currently acquired evaporator temperature is greater than or equal to the previously acquired evaporator temperature, or the evaporator temperature change rate is less than or equal to a first set value, and if the currently acquired evaporator temperature is less than a second preset temperature, then the air conditioner is determined to meet the evaporator frosting condition.

9. An air conditioner controller, characterized in that, The method includes a memory, a processor, and a liquid refrigerant deposition prevention program stored in the memory and executable on the processor. When the processor executes the liquid refrigerant deposition prevention program, it implements the liquid refrigerant deposition prevention method according to any one of claims 1-6.

10. A computer-readable storage medium, characterized in that, It stores a liquid refrigerant deposition prevention program, which, when executed by a processor, implements the liquid refrigerant deposition prevention method according to any one of claims 1-6.

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