Air conditioner, and refrigerant recovery control method, device, storage medium, and program product

Abstract

The application provides an air conditioner and a refrigerant recovery control method, device, storage medium and program product thereof. The method comprises the following steps: when the air conditioner is in refrigerant recovery, judging a refrigerant recovery stage of the air conditioner according to an evaporator outlet temperature detected by an evaporator outlet temperature sensing bulb, a condenser outlet temperature detected by a condenser outlet temperature sensing bulb, a compressor discharge temperature detected by a compressor discharge temperature sensing bulb and a high-pressure value of the air conditioner; and judging whether the evaporator outlet temperature sensing bulb, the condenser outlet temperature sensing bulb or the compressor discharge temperature sensing bulb is faulty according to the refrigerant recovery stage of the air conditioner, in combination with the evaporator outlet temperature detected by the evaporator outlet temperature sensing bulb, the condenser outlet temperature detected by the condenser outlet temperature sensing bulb and the compressor discharge temperature detected by the compressor discharge temperature sensing bulb. The scheme provided by the application can enhance the accuracy of refrigerant recovery and avoid the situation of false recovery.

Description

Technical Field

[0001] This invention relates to the field of control, and more particularly to an air conditioner and its refrigerant recovery control method, apparatus, storage medium and program product. Background Technology

[0002] In refrigeration systems, temperature sensors, as key components for temperature detection, are widely used in air conditioners, refrigerators, and other equipment. Their main function is to sense the temperature of the evaporator or condenser and feed the temperature signal back to the control system to adjust the compressor's operating status, refrigerant flow, and other parameters. However, during long-term operation, temperature sensors may experience drift, failure, or false temperature readings, leading to inaccurate system control, affecting cooling performance, and even causing equipment malfunctions.

[0003] Before disassembling and reassembling the air conditioner, a refrigerant recovery operation is performed to ensure that there is no risk of refrigerant leakage. During the refrigerant recovery process, the relevant technology determines whether the refrigerant has been completely recovered by collecting the indoor and outdoor outlet air temperatures and the high-pressure side pressure values, and then using corresponding logic to determine whether the recovery is complete. However, this method is highly dependent on the accuracy of the temperature sensor. If the temperature sensor malfunctions, it will cause the system to make incorrect judgments about the refrigerant recovery process, resulting in the risk of refrigerant leakage. Therefore, it is very important to diagnose the malfunction of the temperature sensor during the refrigerant recovery process. Summary of the Invention

[0004] The main objective of this invention is to overcome the deficiencies of the aforementioned related technologies and provide an air conditioner and its refrigerant recovery control method, device, storage medium, and program product to solve the problem that a malfunction in the temperature sensing bulb can lead to incorrect judgments about the refrigerant recovery process in the related technologies.

[0005] This invention provides a refrigerant recovery control method for an air conditioner, comprising: when the air conditioner is recovering refrigerant, determining the current refrigerant recovery stage of the air conditioner based on the evaporator outlet temperature detected by the evaporator outlet temperature sensor, the condenser outlet temperature detected by the condenser outlet temperature sensor, the compressor discharge temperature detected by the compressor discharge temperature sensor, and the high-pressure value of the air conditioner; the refrigerant recovery stage includes: a pre-refrigerant recovery stage, a refrigerant recovery in progress stage, and a refrigerant recovery completion stage; based on the current refrigerant recovery stage of the air conditioner, and in conjunction with the evaporator outlet temperature detected by the evaporator outlet temperature sensor, the condenser outlet temperature detected by the condenser outlet temperature sensor, and / or the compressor discharge temperature detected by the compressor discharge temperature sensor, determining whether the evaporator outlet temperature sensor, the condenser outlet temperature sensor, and / or the compressor discharge temperature sensor are faulty.

[0006] Optionally, based on the evaporator outlet temperature detected by the current evaporator outlet temperature sensor, the condenser outlet temperature detected by the current condenser outlet temperature sensor, the compressor discharge temperature detected by the current compressor discharge temperature sensor, and the high-pressure value of the air conditioner, the refrigerant recovery stage of the air conditioner is determined, including: determining the temperature range in which the evaporator outlet temperature, condenser outlet temperature, and compressor discharge temperature fall within the preset different refrigerant recovery stages corresponding to the evaporator outlet temperature range, condenser outlet temperature range, and compressor discharge temperature range, and the pressure range in which the high-pressure value falls within the preset different refrigerant recovery stages corresponding to the high-pressure pressure range; and determining the refrigerant recovery stage of the air conditioner based on the temperature range in which the evaporator outlet temperature, condenser outlet temperature, and compressor discharge temperature fall within the preset different refrigerant recovery stages corresponding to the evaporator outlet temperature range, condenser outlet temperature range, and compressor discharge temperature range, and the pressure range in which the high-pressure value falls within the preset different refrigerant recovery stages corresponding to the high-pressure pressure range.

[0007] Optionally, based on the refrigerant recovery stage of the air conditioner, and in conjunction with the evaporator outlet temperature detected by the evaporator outlet temperature sensor, the condenser outlet temperature detected by the condenser outlet temperature sensor, and / or the compressor discharge temperature detected by the compressor discharge temperature sensor, it is determined whether the evaporator outlet temperature sensor, the condenser outlet temperature sensor, and / or the compressor discharge temperature sensor are faulty. This includes: in the pre-refrigerant recovery stage, determining whether the first evaporator outlet temperature detected by the current evaporator outlet temperature sensor is within a first preset evaporator outlet temperature range, whether the first condenser outlet temperature detected by the condenser outlet temperature sensor is within a first preset condenser outlet temperature range, and the compressor discharge temperature... The temperature sensor detects whether the first compressor discharge temperature is within the first preset discharge temperature range. If the first evaporator outlet temperature, the first condenser outlet temperature, or the first compressor discharge temperature are all outside the first preset discharge temperature range, then the corresponding temperature sensor is determined to be faulty. If the first evaporator outlet temperature, the first condenser outlet temperature, and the first compressor discharge temperature are all within the first preset discharge temperature range, then the refrigerant recovery phase begins.

[0008] Optionally, based on the refrigerant recovery stage of the air conditioner, and in conjunction with the evaporator outlet temperature detected by the evaporator outlet temperature sensor, the condenser outlet temperature detected by the condenser outlet temperature sensor, and / or the compressor discharge temperature detected by the compressor discharge temperature sensor, determining whether the evaporator outlet temperature sensor, the condenser outlet temperature sensor, and / or the compressor discharge temperature sensor are faulty, further includes: during the refrigerant recovery stage, determining whether the difference between the second evaporator outlet temperature detected by the evaporator outlet temperature sensor and the first evaporator outlet temperature is greater than or equal to zero, whether the difference between the second condenser outlet temperature detected by the condenser outlet temperature sensor and the first condenser outlet temperature is greater than or equal to zero, and whether the difference between the second compressor discharge temperature detected by the compressor discharge temperature sensor and the first preset discharge temperature is greater than or equal to zero; if the difference between the second evaporator outlet temperature and the preset discharge temperature is greater than or equal to zero, the determination is made that the difference between the second evaporator outlet temperature and the preset discharge temperature is greater than or equal to zero. If the temperature difference between the first evaporator outlet and the second evaporator outlet is less than zero, or the temperature difference between the second compressor discharge temperature and the first preset discharge temperature is greater than or equal to zero, then the corresponding temperature sensor is determined to be faulty and is inspected. If the temperature difference between the second evaporator outlet and the first evaporator outlet is greater than or equal to zero, or the temperature difference between the second compressor discharge temperature and the first preset discharge temperature is less than zero, then refrigerant recovery continues. Based on the current second evaporator outlet temperature detected by the evaporator outlet temperature sensor, the second condenser outlet temperature detected by the condenser outlet temperature sensor, and the second compressor discharge temperature detected by the compressor discharge temperature sensor, it is determined whether a temperature sensor malfunction has occurred.

[0009] Optionally, based on the current evaporator outlet temperature detected by the evaporator outlet temperature sensor, the second condenser outlet temperature detected by the condenser outlet temperature sensor, and the second compressor discharge temperature detected by the compressor discharge temperature sensor, it is determined whether a temperature sensor malfunction has occurred. This includes: determining whether the current evaporator outlet temperature detected by the evaporator outlet temperature sensor is within the second preset evaporator outlet temperature range, whether the current condenser outlet temperature detected by the condenser outlet temperature sensor is within the second preset condenser outlet temperature range, and whether the current compressor discharge temperature detected by the compressor discharge temperature sensor is within the second preset discharge temperature range; if it is determined that the second evaporator outlet temperature is not within the second preset evaporator outlet temperature range, the second condenser outlet temperature is not within the second preset condenser outlet temperature range, or the second compressor discharge temperature is not within the second preset discharge temperature range, then it is determined that the corresponding temperature sensor malfunctions; if it is determined that the second evaporator outlet temperature is within the second preset evaporator outlet temperature range, the second condenser outlet temperature is within the second preset condenser outlet temperature range, and the second compressor discharge temperature is within the second preset discharge temperature range, then the refrigerant recovery completion stage is entered.

[0010] Optionally, based on the refrigerant recovery stage of the air conditioner, and in conjunction with the evaporator outlet temperature detected by the evaporator outlet temperature sensor, the condenser outlet temperature detected by the condenser outlet temperature sensor, and / or the compressor discharge temperature detected by the compressor discharge temperature sensor, to determine whether the evaporator outlet temperature sensor, the condenser outlet temperature sensor, and / or the compressor discharge temperature sensor are faulty, the method further includes: in the refrigerant recovery completion stage, determining whether the current evaporator outlet temperature detected by the evaporator outlet temperature sensor is greater than or equal to the difference between the indoor ambient temperature and a preset temperature value, and less than or equal to the sum of the indoor ambient temperature and the preset temperature value; and whether the current condenser outlet temperature detected by the condenser outlet temperature sensor is greater than or equal to the difference between the outdoor ambient temperature and the preset temperature value, and less than or equal to the sum of the outdoor ambient temperature and the preset temperature value. The system checks whether the sum of the ambient temperature and the preset temperature value, and the third compressor exhaust temperature detected by the compressor exhaust temperature sensor, are greater than or equal to the difference between the outdoor ambient temperature and the preset temperature value, and less than or equal to the sum of the outdoor ambient temperature and the preset temperature value; if the third evaporator outlet temperature is greater than or equal to the difference between the indoor ambient temperature and the preset temperature value, and less than or equal to the sum of the indoor ambient temperature and the preset temperature value; the third condenser outlet temperature is greater than or equal to the difference between the outdoor ambient temperature and the preset temperature value, and less than or equal to the sum of the outdoor ambient temperature and the preset temperature value; or the third compressor exhaust temperature is greater than or equal to the difference between the outdoor ambient temperature and the preset temperature value, and less than or equal to the sum of the outdoor ambient temperature and the preset temperature value, then the refrigerant recovery is confirmed to be complete; otherwise, the corresponding temperature sensor is confirmed to be faulty.

[0011] Another aspect of the present invention provides a refrigerant recovery control device for an air conditioner, comprising: a first judgment unit, configured to determine the refrigerant recovery stage of the air conditioner during refrigerant recovery based on the current evaporator outlet temperature detected by the evaporator outlet temperature sensor, the condenser outlet temperature detected by the condenser outlet temperature sensor, the compressor exhaust temperature detected by the compressor exhaust temperature sensor, and the high-pressure value of the air conditioner; the refrigerant recovery stage includes: a pre-refrigerant recovery stage, a refrigerant recovery in progress stage, and a refrigerant recovery completion stage; and a second judgment unit, configured to determine whether the evaporator outlet temperature sensor, the condenser outlet temperature sensor, and / or the compressor exhaust temperature sensor are malfunctioning based on the refrigerant recovery stage determined by the first judgment unit, combined with the evaporator outlet temperature detected by the evaporator outlet temperature sensor, the condenser outlet temperature detected by the condenser outlet temperature sensor, and / or the compressor exhaust temperature sensor detected by the compressor exhaust temperature sensor.

[0012] Optionally, the first determining unit determines the refrigerant recovery stage of the air conditioner based on the evaporator outlet temperature detected by the current evaporator outlet temperature sensor, the condenser outlet temperature detected by the condenser outlet temperature sensor, the compressor discharge temperature detected by the compressor discharge temperature sensor, and the high-pressure value of the air conditioner. This includes: determining the temperature range in which the evaporator outlet temperature, condenser outlet temperature, and compressor discharge temperature fall within the preset different refrigerant recovery stages corresponding to the evaporator outlet temperature range, condenser outlet temperature range, and compressor discharge temperature range, and the pressure range in which the high-pressure value falls within the preset different refrigerant recovery stages corresponding to the high-pressure pressure range; and determining the refrigerant recovery stage of the air conditioner based on the temperature range in which the evaporator outlet temperature, condenser outlet temperature, and compressor discharge temperature fall within the preset different refrigerant recovery stages corresponding to the evaporator outlet temperature range, condenser outlet temperature range, and compressor discharge temperature range, and the pressure range in which the high-pressure value falls within the preset different refrigerant recovery stages corresponding to the high-pressure pressure range.

[0013] Optionally, the second judgment unit, based on the refrigerant recovery stage of the air conditioner, and in conjunction with the evaporator outlet temperature detected by the evaporator outlet temperature sensor, the condenser outlet temperature detected by the condenser outlet temperature sensor, and / or the compressor discharge temperature detected by the compressor discharge temperature sensor, determines whether the evaporator outlet temperature sensor, the condenser outlet temperature sensor, and / or the compressor discharge temperature sensor are faulty. This includes: in the pre-refrigerant recovery stage, determining whether the first evaporator outlet temperature detected by the current evaporator outlet temperature sensor is within a first preset evaporator outlet temperature range, whether the first condenser outlet temperature detected by the condenser outlet temperature sensor is within a first preset condenser outlet temperature range, and and... The compressor discharge temperature sensor detects whether the first compressor discharge temperature is within the first preset discharge temperature range. If it is determined that the first evaporator outlet temperature is not within the first preset evaporator outlet temperature range, the first condenser outlet temperature is not within the first preset condenser outlet temperature range, or the first compressor discharge temperature is not within the first preset discharge temperature range, then the corresponding temperature sensor is determined to be faulty. If it is determined that the first evaporator outlet temperature, the first condenser outlet temperature, and the first compressor discharge temperature are all within the first preset discharge temperature range, then the refrigerant recovery stage begins.

[0014] Optionally, the second judgment unit, based on the refrigerant recovery stage of the air conditioner and in conjunction with the evaporator outlet temperature detected by the evaporator outlet temperature sensor, the condenser outlet temperature detected by the condenser outlet temperature sensor, and / or the compressor discharge temperature detected by the compressor discharge temperature sensor, determines whether the evaporator outlet temperature sensor, the condenser outlet temperature sensor, and / or the compressor discharge temperature sensor are faulty. This further includes: during the refrigerant recovery stage, determining whether the difference between the second evaporator outlet temperature detected by the evaporator outlet temperature sensor and the first evaporator outlet temperature is greater than or equal to zero, whether the difference between the second condenser outlet temperature detected by the condenser outlet temperature sensor and the first condenser outlet temperature is greater than or equal to zero, and whether the difference between the second compressor discharge temperature detected by the compressor discharge temperature sensor and the first preset discharge temperature is greater than or equal to zero; if the second evaporator outlet temperature sensor is faulty... If the temperature difference between the first evaporator outlet temperature and the second evaporator outlet temperature is less than zero, or the temperature difference between the second compressor discharge temperature and the first preset discharge temperature is greater than or equal to zero, then the corresponding temperature sensor is determined to be faulty and is inspected. If the temperature difference between the second evaporator outlet temperature and the first evaporator outlet temperature is determined to be greater than or equal to zero, or the temperature difference between the second compressor discharge temperature and the first preset discharge temperature is less than zero, then refrigerant recovery continues, and the presence of a temperature sensor fault is determined based on the current second evaporator outlet temperature detected by the evaporator outlet temperature sensor, the second condenser outlet temperature detected by the condenser outlet temperature sensor, and the second compressor discharge temperature detected by the compressor discharge temperature sensor.

[0015] Optionally, the second judgment unit determines whether a temperature sensor malfunction has occurred based on the current evaporator outlet temperature detected by the evaporator outlet temperature sensor, the second condenser outlet temperature detected by the condenser outlet temperature sensor, and the second compressor discharge temperature detected by the compressor discharge temperature sensor. This includes: determining whether the current evaporator outlet temperature detected by the evaporator outlet temperature sensor is within the second preset evaporator outlet temperature range, whether the current condenser outlet temperature detected by the condenser outlet temperature sensor is within the second preset condenser outlet temperature range, and whether the current compressor discharge temperature detected by the compressor discharge temperature sensor is within the second preset discharge temperature range; if the second evaporator outlet temperature is not within the second preset evaporator outlet temperature range, the second condenser outlet temperature is not within the second preset condenser outlet temperature range, or the second compressor discharge temperature is not within the second preset discharge temperature range, then the corresponding temperature sensor is determined to be malfunctioning; if the second evaporator outlet temperature is within the second preset evaporator outlet temperature range, the second condenser outlet temperature is within the second preset condenser outlet temperature range, and the second compressor discharge temperature is within the second preset discharge temperature range, then the refrigerant recovery completion stage is entered.

[0016] Optionally, the second judgment unit, based on the refrigerant recovery stage of the air conditioner and in conjunction with the evaporator outlet temperature detected by the evaporator outlet temperature sensor, the condenser outlet temperature detected by the condenser outlet temperature sensor, and / or the compressor discharge temperature detected by the compressor discharge temperature sensor, determines whether the evaporator outlet temperature sensor, the condenser outlet temperature sensor, and / or the compressor discharge temperature sensor are faulty. This further includes: in the refrigerant recovery completion stage, determining whether the current evaporator outlet temperature detected by the evaporator outlet temperature sensor is greater than or equal to the difference between the indoor ambient temperature and a preset temperature value, and less than or equal to the sum of the indoor ambient temperature and the preset temperature value; and whether the current condenser outlet temperature detected by the condenser outlet temperature sensor is greater than or equal to the difference between the outdoor ambient temperature and the preset temperature value, and less than... The refrigerant recovery is determined to be complete if the sum of the outdoor ambient temperature and the preset temperature, and the third compressor exhaust temperature detected by the compressor exhaust temperature sensor, are greater than or equal to the difference between the outdoor ambient temperature and the preset temperature, and less than or equal to the sum of the outdoor ambient temperature and the preset temperature; otherwise, the corresponding temperature sensor is determined to be faulty.

[0017] In another aspect, the present invention provides a storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the methods described above.

[0018] In another aspect, the present invention provides an air conditioner, including a processor, a memory, and a computer program stored in the memory that can run on the processor, wherein the processor executes the program to implement the steps of any of the methods described above.

[0019] In another aspect, the present invention provides an air conditioner including any of the refrigerant recovery control devices described above.

[0020] In another aspect, the present invention provides a computer program product, including a computer program that, when executed by a processor, implements the steps of any of the methods described above.

[0021] According to the technical solution of the present invention, the refrigerant recovery is completed by judging the evaporator outlet temperature, condenser outlet temperature, compressor exhaust temperature and high pressure value. The refrigerant recovery can be detected without adding other detection sensors, which not only saves costs but also improves the accuracy of detection.

[0022] According to the technical solution of the present invention, the temperature change pattern (evaporator outlet temperature, condenser outlet temperature, and compressor exhaust temperature) during the refrigerant recovery process is used to determine whether the temperature sensing bulb is operating normally. This method detects temperature sensing bulb malfunctions without the need for additional sensors, and detecting temperature sensing bulb malfunctions during the refrigerant recovery process can enhance the accuracy of the recovery and avoid erroneous recovery. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0024] Figure 1 This is a schematic diagram of an embodiment of the refrigerant recovery control method for air conditioning provided by the present invention;

[0025] Figure 2 A schematic diagram illustrating the determination of the refrigerant recovery stage according to a specific embodiment of the present invention is shown;

[0026] Figure 3 A control flow chart for refrigerant recovery according to a specific embodiment of the present invention is shown;

[0027] Figure 4 This is a structural block diagram of an embodiment of the refrigerant recovery control device for air conditioning provided by the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention 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 so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0030] This invention provides a refrigerant recovery control method for air conditioners.

[0031] Figure 1 This is a schematic diagram of an embodiment of the refrigerant recovery control method for air conditioning provided by the present invention.

[0032] like Figure 1 As shown, according to an embodiment of the present invention, the refrigerant recovery control method includes at least steps S110 and S120.

[0033] Step S110: When the air conditioner is performing refrigerant recovery, the refrigerant recovery stage of the air conditioner is determined based on the evaporator outlet temperature detected by the evaporator outlet temperature sensor, the condenser outlet temperature detected by the condenser outlet temperature sensor, the compressor discharge temperature detected by the compressor discharge temperature sensor, and the high pressure value of the air conditioner.

[0034] Specifically, the air conditioner is equipped with an indoor unit evaporator outlet temperature sensor, an outdoor unit condenser outlet temperature sensor, and a compressor discharge temperature sensor to detect the evaporator outlet temperature, condenser outlet temperature, and compressor discharge temperature, respectively, and a pressure sensor to detect the high-pressure of the air conditioning system. The refrigerant recovery stage may specifically include: a pre-refrigerant recovery stage (e.g., pre-refrigerant recovery stage), a refrigerant recovery intermediate stage (e.g., refrigerant recovery intermediate stage), and a refrigerant recovery completion stage (e.g., post-refrigerant recovery stage).

[0035] In one specific embodiment, the temperature range in which the evaporator outlet temperature, condenser outlet temperature, and compressor discharge temperature fall within the preset refrigerant recovery stages, and the pressure range in which the high-pressure value falls within the preset high-pressure range corresponding to the different refrigerant recovery stages, are determined; based on the temperature range in which the evaporator outlet temperature, condenser outlet temperature, and compressor discharge temperature fall within the preset refrigerant recovery stages, and the pressure range in which the high-pressure value falls within the preset high-pressure range corresponding to the different refrigerant recovery stages, the refrigerant recovery stage of the air conditioner is determined.

[0036] Specifically, the evaporator outlet temperature range, condenser outlet temperature range, and compressor discharge temperature range corresponding to different refrigerant recovery stages are preset, as well as the pressure range within the high-pressure range corresponding to different refrigerant recovery stages.

[0037] For example, Table 1 shows an example of the evaporator outlet temperature range (temperature change trend), condenser outlet temperature range (temperature change trend), and compressor discharge temperature range (temperature change trend) corresponding to different refrigerant recovery stages (before refrigerant recovery, during refrigerant recovery, and after refrigerant recovery). Table 2 shows an example of the pressure range within the high-pressure range (pressure change trend) corresponding to different refrigerant recovery stages.

[0038] Table 1

[0039]

[0040] Table 2

[0041]

[0042] Based on the detected evaporator outlet temperature T 蒸出 Condenser outlet temperature T 冷出 and compressor exhaust temperature T 排气 The current refrigerant recovery stage can be determined by the temperature range of the evaporator outlet temperature range, condenser outlet temperature range, and compressor discharge temperature range corresponding to different preset refrigerant recovery stages, as well as the pressure range of the detected high-pressure value HP corresponding to different preset high-pressure pressure ranges corresponding to different refrigerant recovery stages (e.g., the evaporator outlet temperature range, condenser outlet temperature range, compressor discharge temperature range, and pressure range corresponding to different refrigerant recovery stages shown in Tables 1 and 2).

[0043] The evaporator outlet temperature range, condenser outlet temperature range, and compressor discharge temperature range corresponding to different refrigerant recovery stages can be set based on manual experience or predicted using a large model. For example, the indoor unit evaporator outlet temperature T before, during, and after refrigerant recovery can be tested under different operating conditions (outdoor ambient temperature and refrigerant type). 蒸出 Outdoor unit condenser outlet temperature T 冷出 Compressor discharge temperature T 排气温度 The high-pressure value HP is used as training parameters to train the model. Each time the operating conditions are determined, the outdoor ambient temperature and refrigerant type are input, and the large model can predict three sets of temperatures (T). 蒸出 T 冷出 T 排气 The parameters include the high-pressure value. For example, Table 1 shows the preset parameters obtained under standard operating conditions (outdoor ambient temperature 35℃, refrigerant type R32).

[0044] Under normal operating conditions, during refrigerant recovery, the temperature and high-pressure values ​​of various components in the entire system change according to a fixed pattern. For example, the temperature of the evaporator outlet temperature sensor will gradually increase as the cooling capacity decreases and the evaporator's heat absorption capacity decreases; the temperature of the condenser outlet temperature sensor will decrease as the refrigerant decreases, the condensing pressure decreases, the condenser's heat dissipation decreases, and the temperature decreases; the temperature of the compressor discharge temperature sensor will decrease as the cooling capacity decreases and the compressor load decreases. However, under different operating conditions, although the general pattern of change is consistent, the actual temperature range will be slightly different. For example, refrigerant recovery in an outdoor environment of 20℃ will differ from that in an outdoor environment of 40℃. Table 1 shows a range under standard operating conditions (outdoor 35℃). The actual temperature range under different operating conditions can be determined through testing. The test data or human experience values ​​under different operating conditions can be used as training set samples and input into a large model algorithm to predict the optimal range parameters.

[0045] During the refrigerant recovery process, the high-pressure value also changes according to a fixed pattern. For example, under standard operating conditions, the pressure will gradually decrease from 1.40 MPa to 0.10 MPa. Generally, a decrease of 0.10 MPa indicates that the refrigerant recovery is complete. Under different operating conditions (different ambient temperatures, different refrigerants), the high-pressure range will vary slightly. The optimal range is predicted by a large model, such as the pressure range shown in Table 2.

[0046] Step S120: Based on the refrigerant recovery stage of the air conditioner, and in conjunction with the evaporator outlet temperature detected by the evaporator outlet temperature sensor, the condenser outlet temperature detected by the condenser outlet temperature sensor, and / or the compressor exhaust temperature detected by the compressor exhaust temperature sensor, determine whether the evaporator outlet temperature sensor, the condenser outlet temperature sensor, and / or the compressor exhaust temperature sensor are faulty.

[0047] In one specific embodiment, determining whether the evaporator outlet temperature sensor, the condenser outlet temperature sensor, or the compressor exhaust temperature sensor is faulty may include the following:

[0048] (1) In the stage before refrigerant recovery, determine the first evaporator outlet temperature T detected by the current evaporator outlet temperature sensor. 蒸出1 Is it within the first preset evaporator outlet temperature range, and is the first condenser outlet temperature T detected by the condenser outlet temperature sensor? 冷出1 Whether it falls within the first preset condenser outlet temperature range and the first compressor discharge temperature T detected by the compressor discharge temperature sensor. 排气1 Whether it is within the first preset exhaust temperature range; if so, determine the first evaporator outlet temperature T 蒸出1 Not within the first preset evaporator outlet temperature range, the first condenser outlet temperature T 冷出1 Not within the first preset condenser outlet temperature range or the first compressor discharge temperature T 排气1 If the temperature is not within the first preset exhaust temperature range, the corresponding temperature sensor is determined to be faulty and is calibrated (e.g., by adjusting the mapping function between the resistance of the temperature sensor and the ambient temperature to correct the measured temperature of the temperature sensor); if the first evaporator outlet temperature, the first condenser outlet temperature, and the first compressor exhaust temperature are all within the first preset exhaust temperature range, the refrigerant recovery stage is entered.

[0049] For example, when the refrigerant recovery stage (fluorine recovery stage) is marked as "before refrigerant recovery," that is, the stage before refrigerant recovery, the outlet temperature T of the first evaporator is obtained through a temperature sensing bulb. 蒸出1 The outlet temperature T of the first condenser 冷出1 and the first compressor exhaust temperature T 排气1 The first preset evaporator outlet temperature range is 5℃≤T 蒸出1 ≤10℃, the first preset condenser outlet temperature range is 45℃≤T 冷出1 ≤55℃, the first preset exhaust temperature range is 90℃≤T 排气温度1 ≤110℃. If the outlet temperature T of the first evaporator 蒸出1 The outlet temperature T of the first condenser 冷出1 Or the first compressor discharge temperature T 排气1 If the temperature is outside the corresponding temperature range, an abnormal temperature reading may have occurred, and the corresponding temperature sensor should be calibrated. If the outlet temperature T of the first evaporator is... 蒸出1 The outlet temperature T of the first condenser 冷出1 and the first compressor exhaust temperature T 排气1If all values ​​are within the corresponding temperature range, it indicates that the temperature sensor is functioning normally and the process can proceed to the next stage, namely the refrigerant recovery stage.

[0050] (2) During the refrigerant recovery stage, determine whether the difference between the second evaporator outlet temperature detected by the evaporator outlet temperature sensor and the first evaporator outlet temperature is greater than or equal to zero, whether the difference between the second condenser outlet temperature detected by the condenser outlet temperature sensor and the first condenser outlet temperature is greater than or equal to zero, and whether the difference between the second compressor exhaust temperature detected by the compressor exhaust temperature sensor and the first preset exhaust temperature is greater than or equal to zero; if the difference between the second evaporator outlet temperature and the first evaporator outlet temperature is less than zero, the difference between the second evaporator outlet temperature and the first evaporator outlet temperature is greater than or equal to zero, or the difference between the second compressor exhaust temperature and the first preset exhaust temperature is greater than or equal to zero; If the difference between the first preset exhaust temperature and the first preset exhaust temperature is greater than or equal to zero, then the corresponding temperature sensor is determined to be faulty and is inspected. If the difference between the second evaporator outlet temperature and the first evaporator outlet temperature is determined to be greater than or equal to zero, the difference between the second evaporator outlet temperature and the first evaporator outlet temperature is less than zero, or the difference between the second compressor exhaust temperature and the first preset exhaust temperature is less than zero, then refrigerant recovery continues. Based on the second evaporator outlet temperature detected by the current evaporator outlet temperature sensor, the second condenser outlet temperature detected by the current condenser outlet temperature sensor, and the second compressor exhaust temperature detected by the current compressor exhaust temperature sensor, it is determined whether a temperature sensor malfunction has occurred.

[0051] For example, when the refrigerant recovery stage (fluorine recovery stage) is marked as "Freon Recovery in Progress," i.e., the refrigerant recovery is in progress stage, the outlet temperature T of the second evaporator is obtained through a temperature sensing bulb. 蒸出2 Second condenser outlet temperature T 冷出2 Second compressor discharge temperature T 排气2 The obtained T 蒸出2 T 冷出2 and T 排气2 Compared with the T obtained in the previous stage 蒸出1 T 冷出1 and T 排气1 Compare them, if T 蒸出2 -T 蒸出1 If T ≥ 0, it indicates that the evaporator outlet temperature sensor is normal; otherwise, an evaporator outlet temperature sensor malfunction is reported, and the evaporator outlet temperature sensor should be inspected. 冷出2 -T 冷出1 If the value is ≥0, it indicates a fault in the evaporator outlet temperature sensor; the condenser outlet temperature sensor should be checked. Otherwise, it indicates the condenser outlet temperature sensor is normal. If T 排气2 -T 排气1 If the value is ≥0, it indicates a fault in the compressor exhaust temperature sensor. The compressor exhaust temperature sensor should be checked. Otherwise, it indicates that the compressor exhaust temperature sensor is normal.

[0052] If the evaporator outlet temperature sensor, the compressor discharge temperature sensor, and the compressor discharge temperature sensor are all determined to be normal, then refrigerant recovery continues, and further adjustments are made based on the second evaporator outlet temperature T. 蒸出2 Second condenser outlet temperature T 冷出2 Second compressor discharge temperature T 排气2 Determine if there is a malfunction in the temperature sensor.

[0053] Specifically, it is determined whether the second evaporator outlet temperature detected by the current evaporator outlet temperature sensor is within the second preset evaporator outlet temperature range, whether the second condenser outlet temperature detected by the condenser outlet temperature sensor is within the second preset condenser outlet temperature range, and whether the second compressor discharge temperature detected by the compressor discharge temperature sensor is within the second preset discharge temperature range. If it is determined that the second evaporator outlet temperature is not within the second preset evaporator outlet temperature range, the second condenser outlet temperature is not within the second preset condenser outlet temperature range, or the second compressor discharge temperature is not within the second preset discharge temperature range, then it is determined that the corresponding temperature sensor has malfunctioned. If it is determined that the second evaporator outlet temperature is within the second preset evaporator outlet temperature range, the second condenser outlet temperature is within the second preset condenser outlet temperature range, and the second compressor discharge temperature is within the second preset discharge temperature range, then the refrigerant recovery completion stage is entered.

[0054] For example, the second preset evaporator outlet temperature range is 15℃≤T 蒸出2 ≤35℃, the second preset condenser outlet temperature range is 15℃≤T 冷出2 ≤40℃, the second preset exhaust temperature range is 70℃≤T 排气2 ≤85℃, if the outlet temperature T of the second evaporator 蒸出2 Second condenser outlet temperature T 冷出2 Or the discharge temperature T of the second compressor 排气2 If the temperature is outside the corresponding range, an abnormal temperature reading may have occurred. In this case, the corresponding temperature sensor should be calibrated. If the outlet temperature T of the second evaporator is... 蒸出2 Second condenser outlet temperature T 冷出2 Second compressor discharge temperature T 排气2 If all temperatures are within the corresponding temperature range, it indicates that the corresponding temperature sensors have not shown any abnormalities, and the next stage, namely the refrigerant recovery completion stage, can be carried out.

[0055] If the actual temperature collected by the temperature sensor is not within the corresponding range, it indicates that the collected temperature is inaccurate, and the temperature sensor may be faulty. For example, during the refrigerant recovery process, the temperature collected by the temperature sensor at the evaporator outlet should gradually rise until it approaches room temperature, but the actual temperature is decreasing, which is obviously inconsistent with the expected change pattern, indicating that the temperature sensor is faulty. For example, under standard operating conditions, the evaporator outlet temperature during refrigerant recovery should be between 15℃ and 35℃, but the actual collected temperature is 40℃ or even 45℃, indicating that the collected temperature is inaccurate and the temperature sensor needs to be calibrated.

[0056] (3) During the refrigerant recovery completion stage, determine whether the third evaporator outlet temperature detected by the current evaporator outlet temperature sensor is greater than or equal to the difference between the indoor ambient temperature and the preset temperature value, and less than or equal to the sum of the indoor ambient temperature and the preset temperature value; whether the third condenser outlet temperature detected by the condenser outlet temperature sensor is greater than or equal to the difference between the outdoor ambient temperature and the preset temperature value, and less than or equal to the sum of the outdoor ambient temperature and the preset temperature value; and whether the third compressor exhaust temperature detected by the compressor exhaust temperature sensor is greater than or equal to the difference between the outdoor ambient temperature and the preset temperature value, and less than or equal to the sum of the outdoor ambient temperature and the preset temperature value. If the third evaporator outlet temperature is greater than or equal to the difference between the indoor ambient temperature and the preset temperature value, and less than or equal to the sum of the indoor ambient temperature and the preset temperature value; the third condenser outlet temperature is greater than or equal to the difference between the outdoor ambient temperature and the preset temperature value, and less than or equal to the sum of the outdoor ambient temperature and the preset temperature value; or the third compressor exhaust temperature is greater than or equal to the difference between the outdoor ambient temperature and the preset temperature value, and less than or equal to the sum of the outdoor ambient temperature and the preset temperature value, then the refrigerant recovery is confirmed to be complete; otherwise, the corresponding temperature sensor is confirmed to be faulty.

[0057] For example, when the refrigerant recovery stage (fluorine recovery stage) is marked as "after refrigerant recovery," that is, the refrigerant recovery is complete, the outlet temperature T of the third evaporator is obtained through a temperature sensing bulb. 蒸出3 The outlet temperature T of the third condenser 冷出3 and the exhaust temperature T of the third compressor 排气3 and indoor ambient temperature T 内环 and outdoor ambient temperature T 外环 The preset temperature value is 1℃, and the obtained T 蒸出3 T 冷出3 and T 排气3 With T 内环 T 外环 For comparison, if T 内环 -1℃≤T 蒸出3 ≤T 内环 +1℃ indicates the temperature sensor is functioning normally; otherwise, a temperature sensor malfunction is reported, and the temperature sensor should be inspected. If T... 外环 -1℃≤T 冷出3 ≤T 外环+1℃ indicates the temperature sensor is functioning normally; otherwise, a temperature sensor malfunction is reported, and the temperature sensor should be inspected. If T... 外环 -1℃≤T 排气3 ≤T 外环 If the temperature is +1℃, it means the temperature sensor is working properly; otherwise, a temperature sensor malfunction is reported, and the temperature sensor needs to be checked.

[0058] To clearly illustrate the technical solution of the present invention, the execution flow of the refrigerant recovery control method provided by the present invention will be described below with reference to a specific embodiment.

[0059] Three sets of preset temperature and pressure parameters are used, including the indoor unit evaporator outlet temperature T before refrigerant recovery, during refrigerant recovery, and at the end of refrigerant recovery. 蒸出 Outdoor unit condenser outlet temperature T 冷出 Compressor discharge temperature T 排气 Then obtain the indoor unit evaporator outlet temperature T. 蒸出 Outdoor unit condenser outlet temperature T 冷出 Compressor discharge temperature T 排气 And the high pressure value, by judging T 蒸出 T 冷出 T 排气 The current stage of fluorine recovery is determined by the preset range in which it is located.

[0060] Figure 2 A schematic diagram illustrating the determination of the refrigerant recovery (fluorine recovery) stage according to a specific embodiment of the present invention is shown. Figure 2 As shown, when the unit is preparing to perform refrigerant recovery (before refrigerant recovery), T is first obtained. 蒸出 T 冷出 T 排气 And the high pressure value HP, determine T 蒸出 T 冷出 T 排气 Whether it is within the preset temperature range before refrigerant recovery, and whether the high-pressure value HP is within the preset pressure range before refrigerant recovery, if so, determine T 蒸出 T 冷出 T 排气 If the temperature is within the preset pre-recovery temperature range and the high-pressure value HP is within the preset pre-recovery pressure range, then this moment is determined to be before fluorine recovery and marked; continue to obtain T 蒸出 T 冷出 T 排气 And the high pressure value, determine T 蒸出 T 冷出 T 排气 Whether it is within the preset temperature range for refrigerant recovery, and whether the high-pressure value HP is within the preset pressure range for refrigerant recovery, if so, determine T. 蒸出 T 冷出 T 排气If the temperature range for refrigerant recovery is within the preset range, and the high-pressure value HP is within the preset range, then this moment is determined to be in the process of refrigerant recovery and is marked; continue to obtain T 蒸出 T 冷出 T 排气 And the high pressure value, determine T 蒸出 T 冷出 T 排气 Whether it is within the preset fluorine recovery completion temperature range, and whether the high pressure value HP is within the preset fluorine recovery completion pressure range, if so, determine T 蒸出 T 冷出 T 排气 If the pre-set temperature range for completing fluorine recovery is within the pre-set pressure range for completing fluorine recovery, then this moment is determined to be the completion of fluorine recovery and is marked.

[0061] Figure 3 A control flow diagram for refrigerant recovery according to a specific embodiment of the present invention is shown.

[0062] The above steps can determine the current stage of fluorine recovery. By analyzing the obtained T at different stages... 蒸出 T 冷出 T 排气 Temperature checks are performed to determine if the temperature sensor has malfunctioned or is malfunctioning. For example... Figure 3 As shown, when the fluorine recovery stage is marked as before fluorine recovery, T is obtained through a temperature sensing bulb. 蒸出1 T 冷出1 T 排气1 Determine if any of the following three temperature conditions exist: 5℃≤T 蒸出 1≤10℃; 45℃≤T 冷出1 ≤55℃; 90℃≤T 排气1 ≤110℃, if T 蒸出1 T 冷出1 T 排气1 If the temperature is outside the corresponding temperature range, an abnormal temperature reading may have occurred. In this case, the temperature sensor should be calibrated. If all the measured temperatures are within the corresponding temperature range, it means that the temperature sensor has not detected any abnormalities, and the process proceeds to the next stage. When the refrigerant recovery stage is marked as refrigerant recovery in progress, the temperature sensor is used to obtain T. 蒸出2 T 冷出2 T 排气2 The obtained T 蒸出2 Equivalent to T obtained in the previous stage 蒸出1 T 冷出1 T 排气1 For comparison, if T 蒸出2 -T 蒸出1 If T ≥ 0, it indicates that the temperature sensor is normal; otherwise, a temperature sensor malfunction will be reported to remind the user to check the temperature sensor. 冷出2 -T冷出1 If T ≥ 0, it indicates a fault in the temperature sensor; the temperature sensor should be checked. Otherwise, it indicates that the temperature sensor is normal. 排气2 -T 排气1 If the value is ≥0, it indicates a fault in the temperature sensor, which should be checked. Otherwise, it indicates that the temperature sensor is normal.

[0063] Continue to determine if any of the following three temperature conditions exist: 15℃≤T 蒸出2 ≤35℃, 15℃≤T 冷出2 ≤40℃, 70℃≤T 排气2 If the temperature is ≤85℃, and the acquired temperature is outside this range, an abnormal temperature reading may have occurred. In this case, the temperature sensor should be calibrated. If all acquired temperatures are within the specified range, it indicates that the temperature sensor is functioning correctly, and the process proceeds to the next stage. The refrigerant recovery stage is marked as "after refrigerant recovery," at which point T is acquired. 蒸出3 T 冷出3 T 排气3 T 内环 T 外环 The obtained T 蒸出3 T 冷出3 T 排气3 With T 内环 T 外环 For comparison, if T 内环 -1℃≤T 蒸出3 ≤T 内环 +1℃ indicates the temperature sensor is functioning normally; otherwise, a temperature sensor malfunction is reported, and the temperature sensor should be inspected. If T... 外环 -1℃≤T 冷出3 ≤T 外环 +1℃ indicates the temperature sensor is functioning normally; otherwise, a temperature sensor malfunction is reported, and the temperature sensor should be inspected. If T... 外环 -1℃≤T 排气3 ≤T 外环 If the temperature is +1℃, it means the temperature sensor is working properly; otherwise, a temperature sensor malfunction is reported, and the temperature sensor needs to be checked.

[0064] The present invention also provides a refrigerant recovery control device for air conditioners.

[0065] Figure 4 This is a structural block diagram of an embodiment of the refrigerant recovery control device for air conditioning provided by the present invention. Figure 4 As shown, the refrigerant recovery control device 100 includes: a first judgment unit 110 and a second judgment unit 120.

[0066] The first judgment unit 110 is used to determine the refrigerant recovery stage of the air conditioner based on the evaporator outlet temperature detected by the evaporator outlet temperature sensor, the condenser outlet temperature detected by the condenser outlet temperature sensor, the compressor discharge temperature detected by the compressor discharge temperature sensor, and the high pressure value of the air conditioner when the air conditioner is performing refrigerant recovery.

[0067] Specifically, the air conditioner is equipped with an indoor unit evaporator outlet temperature sensor, an outdoor unit condenser outlet temperature sensor, and a compressor discharge temperature sensor to detect the evaporator outlet temperature, condenser outlet temperature, and compressor discharge temperature, respectively, and a pressure sensor to detect the high-pressure of the air conditioning system. The refrigerant recovery stage may specifically include: a pre-refrigerant recovery stage (e.g., pre-refrigerant recovery stage), a refrigerant recovery intermediate stage (e.g., refrigerant recovery intermediate stage), and a refrigerant recovery completion stage (e.g., post-refrigerant recovery stage).

[0068] In one specific embodiment, the temperature range in which the evaporator outlet temperature, condenser outlet temperature, and compressor discharge temperature fall within the preset refrigerant recovery stages, and the pressure range in which the high-pressure value falls within the preset high-pressure range corresponding to the different refrigerant recovery stages, are determined; based on the temperature range in which the evaporator outlet temperature, condenser outlet temperature, and compressor discharge temperature fall within the preset refrigerant recovery stages, and the pressure range in which the high-pressure value falls within the preset high-pressure range corresponding to the different refrigerant recovery stages, the refrigerant recovery stage of the air conditioner is determined.

[0069] Specifically, the evaporator outlet temperature range, condenser outlet temperature range, and compressor discharge temperature range corresponding to different refrigerant recovery stages are pre-set, as well as the pressure range within the high-pressure range corresponding to different refrigerant recovery stages. For example, Table 1 shows an example of the evaporator outlet temperature range (temperature change trend), condenser outlet temperature range (temperature change trend), and compressor discharge temperature range (temperature change trend) corresponding to different refrigerant recovery stages (before refrigerant recovery, during refrigerant recovery, and after refrigerant recovery). Table 2 shows an example of the pressure range within the high-pressure range (pressure change trend) corresponding to different refrigerant recovery stages.

[0070] Table 1

[0071]

[0072] Table 2

[0073]

[0074] Based on the detected evaporator outlet temperature T蒸出 Condenser outlet temperature T 冷出 and compressor exhaust temperature T 排气 The current refrigerant recovery stage can be determined by the temperature range of the evaporator outlet temperature range, condenser outlet temperature range, and compressor discharge temperature range corresponding to different preset refrigerant recovery stages, as well as the pressure range of the detected high-pressure value HP corresponding to different preset high-pressure pressure ranges corresponding to different refrigerant recovery stages (e.g., the evaporator outlet temperature range, condenser outlet temperature range, compressor discharge temperature range, and pressure range corresponding to different refrigerant recovery stages shown in Tables 1 and 2).

[0075] The evaporator outlet temperature range, condenser outlet temperature range, and compressor discharge temperature range corresponding to different refrigerant recovery stages can be set based on manual experience or predicted using a large model. For example, the indoor unit evaporator outlet temperature T before, during, and after refrigerant recovery can be tested under different operating conditions (outdoor ambient temperature and refrigerant type). 蒸出 Outdoor unit condenser outlet temperature T 冷出 Compressor discharge temperature T 排气温度 The high-pressure value HP is used as training parameters to input into the model. Each time the operating conditions are determined, the outdoor ambient temperature and refrigerant type are input, and the large model can predict three sets of temperatures (T). 蒸出 T 冷出 T 排气 The parameters include the high-pressure value. For example, Table 1 shows the preset parameters obtained under standard operating conditions (outdoor ambient temperature 35℃, refrigerant type R32).

[0076] Under normal operating conditions, during refrigerant recovery, the temperature and high-pressure values ​​of various components in the entire system change according to a fixed pattern. For example, the temperature of the evaporator outlet temperature sensor will gradually increase as the cooling capacity decreases and the evaporator's heat absorption capacity decreases; the temperature of the condenser outlet temperature sensor will decrease as the refrigerant decreases, the condensing pressure decreases, the condenser's heat dissipation decreases, and the temperature decreases; the temperature of the compressor discharge temperature sensor will decrease as the cooling capacity decreases and the compressor load decreases. However, under different operating conditions, although the general pattern of change is consistent, the actual temperature range will be slightly different. For example, refrigerant recovery in an outdoor environment of 20℃ will differ from that in an outdoor environment of 40℃. Table 1 shows a range under standard operating conditions (outdoor 35℃). The actual temperature range under different operating conditions can be determined through testing. The test data or human experience values ​​under different operating conditions can be used as training set samples and input into a large model algorithm to predict the optimal range parameters.

[0077] During the refrigerant recovery process, the high-pressure value also changes according to a fixed pattern. For example, under standard operating conditions, the pressure will gradually decrease from 1.40 MPa to 0.10 MPa. Generally, a decrease of 0.10 MPa indicates that the refrigerant recovery is complete. Under different operating conditions (different ambient temperatures, different refrigerants), the high-pressure range will vary slightly. The optimal range is predicted by a large model, such as the pressure range shown in Table 2.

[0078] The second judgment unit 120 is used to determine whether the evaporator outlet temperature sensor, the condenser outlet temperature sensor, and / or the compressor exhaust temperature sensor are faulty, based on the refrigerant recovery stage determined by the first judgment unit 110 and in combination with the evaporator outlet temperature detected by the evaporator outlet temperature sensor, the condenser outlet temperature detected by the condenser outlet temperature sensor, and / or the compressor exhaust temperature detected by the compressor exhaust temperature sensor.

[0079] In one specific embodiment, the second determination unit 120 determines whether the evaporator outlet temperature sensor, the condenser outlet temperature sensor, or the compressor exhaust temperature sensor is faulty, which may specifically include the following situations:

[0080] (1) In the stage before refrigerant recovery, determine the first evaporator outlet temperature T detected by the current evaporator outlet temperature sensor. 蒸出1 Is it within the first preset evaporator outlet temperature range, and is the first condenser outlet temperature T detected by the condenser outlet temperature sensor? 冷出1 Whether it falls within the first preset condenser outlet temperature range and the first compressor discharge temperature T detected by the compressor discharge temperature sensor. 排气1 Whether it is within the first preset exhaust temperature range; if so, determine the first evaporator outlet temperature T 蒸出1 Not within the first preset evaporator outlet temperature range, the first condenser outlet temperature T 冷出1 Not within the first preset condenser outlet temperature range or the first compressor discharge temperature T 排气1 If the temperature is not within the first preset exhaust temperature range, the corresponding temperature sensor is determined to be faulty and is calibrated (e.g., by adjusting the mapping function between the resistance of the temperature sensor and the ambient temperature to correct the measured temperature of the temperature sensor); if the first evaporator outlet temperature, the first condenser outlet temperature, and the first compressor exhaust temperature are all within the first preset exhaust temperature range, the refrigerant recovery stage is entered.

[0081] For example, when the refrigerant recovery stage (fluorine recovery stage) is marked as "before refrigerant recovery," that is, the stage before refrigerant recovery, the outlet temperature T of the first evaporator is obtained through a temperature sensing bulb. 蒸出1 The outlet temperature T of the first condenser 冷出1 and the first compressor exhaust temperature T排气1 The first preset evaporator outlet temperature range is 5℃≤T 蒸出1 ≤10℃, the first preset condenser outlet temperature range is 45℃≤T 冷出1 ≤55℃, the first preset exhaust temperature range is 90℃≤T 排气温度1 ≤110℃. If the outlet temperature T of the first evaporator 蒸出1 The outlet temperature T of the first condenser 冷出1 Or the first compressor discharge temperature T 排气1 If the temperature is outside the corresponding temperature range, an abnormal temperature reading may have occurred, and the corresponding temperature sensor should be calibrated. If the outlet temperature T of the first evaporator is... 蒸出1 The outlet temperature T of the first condenser 冷出1 and the first compressor exhaust temperature T 排气1 If all values ​​are within the corresponding temperature range, it indicates that the temperature sensor is functioning normally and the process can proceed to the next stage, namely the refrigerant recovery stage.

[0082] (2) During the refrigerant recovery stage, determine whether the difference between the second evaporator outlet temperature detected by the evaporator outlet temperature sensor and the first evaporator outlet temperature is greater than or equal to zero, whether the difference between the second condenser outlet temperature detected by the condenser outlet temperature sensor and the first condenser outlet temperature is greater than or equal to zero, and whether the difference between the second compressor exhaust temperature detected by the compressor exhaust temperature sensor and the first preset exhaust temperature is greater than or equal to zero; if the difference between the second evaporator outlet temperature and the first evaporator outlet temperature is less than zero, the difference between the second evaporator outlet temperature and the first evaporator outlet temperature is greater than or equal to zero, or the difference between the second compressor exhaust temperature and the first preset exhaust temperature is greater than or equal to zero; If the difference between the first preset exhaust temperature and the first preset exhaust temperature is greater than or equal to zero, then the corresponding temperature sensor is determined to be faulty and is inspected. If the difference between the second evaporator outlet temperature and the first evaporator outlet temperature is determined to be greater than or equal to zero, the difference between the second evaporator outlet temperature and the first evaporator outlet temperature is less than zero, or the difference between the second compressor exhaust temperature and the first preset exhaust temperature is less than zero, then refrigerant recovery continues. Based on the second evaporator outlet temperature detected by the current evaporator outlet temperature sensor, the second condenser outlet temperature detected by the current condenser outlet temperature sensor, and the second compressor exhaust temperature detected by the current compressor exhaust temperature sensor, it is determined whether a temperature sensor malfunction has occurred.

[0083] For example, when the refrigerant recovery stage (fluorine recovery stage) is marked as "Freon Recovery in Progress," i.e., the refrigerant recovery is in progress stage, the outlet temperature T of the second evaporator is obtained through a temperature sensing bulb. 蒸出2 Second condenser outlet temperature T 冷出2 Second compressor discharge temperature T 排气2 , will obtain T 蒸出2 T 冷出2 and T 排气2Compared with the T obtained in the previous stage 蒸出1 T 冷出1 and T 排气1 Compare them, if T 蒸出2 -T 蒸出1 If T ≥ 0, it indicates that the evaporator outlet temperature sensor is normal; otherwise, an evaporator outlet temperature sensor malfunction is reported, and the evaporator outlet temperature sensor should be inspected. 冷出2 -T 冷出1 If the value is ≥0, it indicates a fault in the evaporator outlet temperature sensor; the condenser outlet temperature sensor should be checked. Otherwise, it indicates the condenser outlet temperature sensor is normal. If T 排气2 -T 排气1 If the value is ≥0, it indicates a fault in the compressor exhaust temperature sensor. The compressor exhaust temperature sensor should be checked. Otherwise, it indicates that the compressor exhaust temperature sensor is normal.

[0084] If the evaporator outlet temperature sensor, compressor exhaust temperature sensor, and all other temperature sensors are found to be normal, then refrigerant recovery continues, and further adjustments are made based on the second evaporator outlet temperature T. 蒸出2 Second condenser outlet temperature T 冷出2 Second compressor discharge temperature T 排气2 Determine if there is a malfunction in the temperature sensor.

[0085] Specifically, it is determined whether the second evaporator outlet temperature detected by the current evaporator outlet temperature sensor is within the second preset evaporator outlet temperature range, whether the second condenser outlet temperature detected by the condenser outlet temperature sensor is within the second preset condenser outlet temperature range, and whether the second compressor discharge temperature detected by the compressor discharge temperature sensor is within the second preset discharge temperature range. If it is determined that the second evaporator outlet temperature is not within the second preset evaporator outlet temperature range, the second condenser outlet temperature is not within the second preset condenser outlet temperature range, or the second compressor discharge temperature is not within the second preset discharge temperature range, then it is determined that the corresponding temperature sensor has malfunctioned. If it is determined that the second evaporator outlet temperature is within the second preset evaporator outlet temperature range, the second condenser outlet temperature is within the second preset condenser outlet temperature range, and the second compressor discharge temperature is within the second preset discharge temperature range, then the refrigerant recovery completion stage is entered.

[0086] For example, the second preset evaporator outlet temperature range is 15℃≤T 蒸出2 ≤35℃, the second preset condenser outlet temperature range is 15℃≤T 冷出2 ≤40℃, the second preset exhaust temperature range is 70℃≤T 排气2 ≤85℃, if the outlet temperature T of the second evaporator 蒸出2 Second condenser outlet temperature T 冷出2 Or the exhaust temperature T of the second compressor 排气2If the temperature is outside the corresponding temperature range, an abnormal temperature reading may have occurred. In this case, the corresponding temperature sensor should be calibrated. If the outlet temperature T of the second evaporator is... 蒸出2 Second condenser outlet temperature T 冷出2 Second compressor discharge temperature T 排气2 If all temperatures are within the corresponding temperature range, it indicates that the corresponding temperature sensors have not shown any abnormalities, and the process can proceed to the next stage, namely, the refrigerant recovery completion stage.

[0087] If the actual temperature collected by the temperature sensor is not within the corresponding range, it indicates that the collected temperature is inaccurate, and the temperature sensor may be faulty. For example, during the refrigerant recovery process, the temperature collected by the temperature sensor at the evaporator outlet should gradually rise until it approaches room temperature, but the actual temperature is decreasing, which is obviously inconsistent with the expected change pattern, indicating that the temperature sensor is faulty. For example, under standard operating conditions, the evaporator outlet temperature during refrigerant recovery should be between 15℃ and 35℃, but the actual collected temperature is 40℃ or even 45℃, indicating that the collected temperature is inaccurate and the temperature sensor needs to be calibrated.

[0088] (3) During the refrigerant recovery completion stage, determine whether the third evaporator outlet temperature detected by the current evaporator outlet temperature sensor is greater than or equal to the difference between the indoor ambient temperature and the preset temperature value, and less than or equal to the sum of the indoor ambient temperature and the preset temperature value; whether the third condenser outlet temperature detected by the condenser outlet temperature sensor is greater than or equal to the difference between the outdoor ambient temperature and the preset temperature value, and less than or equal to the sum of the outdoor ambient temperature and the preset temperature value; and whether the third compressor exhaust temperature detected by the compressor exhaust temperature sensor is greater than or equal to the difference between the outdoor ambient temperature and the preset temperature value, and less than or equal to the sum of the outdoor ambient temperature and the preset temperature value. If the third evaporator outlet temperature is greater than or equal to the difference between the indoor ambient temperature and the preset temperature value, and less than or equal to the sum of the indoor ambient temperature and the preset temperature value; the third condenser outlet temperature is greater than or equal to the difference between the outdoor ambient temperature and the preset temperature value, and less than or equal to the sum of the outdoor ambient temperature and the preset temperature value; or the third compressor exhaust temperature is greater than or equal to the difference between the outdoor ambient temperature and the preset temperature value, and less than or equal to the sum of the outdoor ambient temperature and the preset temperature value, then the refrigerant recovery is confirmed to be complete; otherwise, the corresponding temperature sensor is confirmed to be faulty.

[0089] For example, when the refrigerant recovery stage (fluorine recovery stage) is marked as "after refrigerant recovery," that is, the refrigerant recovery is complete, the outlet temperature T of the third evaporator is obtained through a temperature sensing bulb. 蒸出3 The outlet temperature T of the third condenser 冷出3 and the exhaust temperature T of the third compressor 排气3 and indoor ambient temperature T 内环 and outdoor ambient temperature T 外环 The preset temperature value is 1℃, and the obtained T 蒸出3 T 冷出3and T 排气3 With T 内环 T 外环 For comparison, if T 内环 -1℃≤T 蒸出3 ≤T 内环 +1℃ indicates the temperature sensor is functioning normally; otherwise, a temperature sensor malfunction is reported, and the temperature sensor should be inspected. If T... 外环 -1℃≤T 冷出3 ≤T 外环 +1℃ indicates the temperature sensor is functioning normally; otherwise, a temperature sensor malfunction is reported, and the temperature sensor should be inspected. If T... 外环 -1℃≤T 排气3 ≤T 外环 If the temperature is +1℃, it means the temperature sensor is working properly; otherwise, a temperature sensor malfunction is reported, and the temperature sensor needs to be checked.

[0090] The present invention also provides a storage medium corresponding to the refrigerant recovery control method, wherein a computer program is stored thereon, and the computer program, when executed by a processor, implements the steps of any of the aforementioned methods.

[0091] The present invention also provides an air conditioner corresponding to the refrigerant recovery control method, including a processor, a memory, and a computer program stored in the memory that can run on the processor, wherein the processor executes the computer program to implement the steps of any of the aforementioned methods.

[0092] The present invention also provides an air conditioner corresponding to the refrigerant recovery control device, including any of the aforementioned refrigerant recovery control devices.

[0093] The present invention also provides a computer program product corresponding to the refrigerant recovery control method, including a computer program that, when executed by a processor, implements the steps of any of the aforementioned methods.

[0094] Accordingly, the solution provided by this invention determines whether refrigerant recovery is complete by judging the evaporator outlet temperature, condenser outlet temperature, compressor exhaust temperature, and high-pressure value. This allows for refrigerant recovery detection without adding other sensors, saving costs and improving detection accuracy. Furthermore, by utilizing the temperature changes (evaporator outlet temperature, condenser outlet temperature, and compressor exhaust temperature) during refrigerant recovery, the proper functioning of the temperature sensing bulb is determined. This eliminates the need for additional external equipment to detect bulb malfunctions, and detecting bulb malfunctions during refrigerant recovery enhances accuracy and prevents erroneous recovery.

[0095] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions can be stored as one or more instructions or codes on or transmitted via a computer-readable medium. Other examples and embodiments are within the scope and spirit of this invention and the appended claims. For example, due to the nature of software, the functions described above can be implemented using software executed by a processor, hardware, firmware, hardwired, or any combination thereof. Furthermore, the functional units can be integrated into a single processing unit, or each unit can exist physically separately, or two or more units can be integrated into a single unit.

[0096] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0097] The units described as separate components may or may not be physically separate. Similarly, the components of the control device may or may not be physical units; they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0098] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to related technologies, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several 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 methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0099] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A refrigerant recovery control method for an air conditioner, characterized in that, include: When the air conditioner is recovering refrigerant, the refrigerant recovery stage of the air conditioner is determined based on the current evaporator outlet temperature detected by the evaporator outlet temperature sensor, the condenser outlet temperature detected by the condenser outlet temperature sensor, the compressor discharge temperature detected by the compressor discharge temperature sensor, and the high-pressure value of the air conditioner. This includes: The system determines the temperature ranges of the evaporator outlet temperature, condenser outlet temperature, and compressor discharge temperature within the preset refrigerant recovery stages, corresponding to the evaporator outlet temperature range, condenser outlet temperature range, and compressor discharge temperature range, and the pressure range of the high-pressure value within the preset high-pressure pressure range corresponding to the preset refrigerant recovery stages. Based on these temperature ranges and the pressure range of the high-pressure value within the preset high-pressure pressure range corresponding to the preset refrigerant recovery stages, the system determines the refrigerant recovery stage of the air conditioner. The refrigerant recovery stages include: a pre-refrigerant recovery stage, a mid-refrigerant recovery stage, and a refrigerant recovery completion stage. Based on the refrigerant recovery stage of the air conditioner, and combining the evaporator outlet temperature detected by the evaporator outlet temperature sensor, the condenser outlet temperature detected by the condenser outlet temperature sensor, and / or the compressor discharge temperature detected by the compressor discharge temperature sensor, determine whether the evaporator outlet temperature sensor, the condenser outlet temperature sensor, and / or the compressor discharge temperature sensor are faulty, including: Before refrigerant recovery, it is determined whether the first evaporator outlet temperature detected by the current evaporator outlet temperature sensor is within the first preset evaporator outlet temperature range, whether the first condenser outlet temperature detected by the condenser outlet temperature sensor is within the first preset condenser outlet temperature range, and whether the first compressor discharge temperature detected by the compressor discharge temperature sensor is within the first preset discharge temperature range. If it is determined that the first evaporator outlet temperature is not within the first preset evaporator outlet temperature range, the first condenser outlet temperature is not within the first preset condenser outlet temperature range, or the first compressor discharge temperature is not within the first preset discharge temperature range, then it is determined that the corresponding temperature sensor has malfunctioned. If the first evaporator outlet temperature is determined to be within the first preset evaporator outlet temperature range, the first condenser outlet temperature is within the first preset condenser outlet temperature range, and the first compressor discharge temperature is within the first preset discharge temperature range, then the refrigerant recovery phase begins.

2. The method according to claim 1, characterized in that, Based on the refrigerant recovery stage of the air conditioner, and combining the evaporator outlet temperature detected by the evaporator outlet temperature sensor, the condenser outlet temperature detected by the condenser outlet temperature sensor, and / or the compressor discharge temperature detected by the compressor discharge temperature sensor, determining whether the evaporator outlet temperature sensor, the condenser outlet temperature sensor, and / or the compressor discharge temperature sensor are faulty, further includes: During the refrigerant recovery phase, it is determined whether the difference between the second evaporator outlet temperature detected by the current evaporator outlet temperature sensor and the first evaporator outlet temperature is greater than or equal to zero, whether the difference between the second condenser outlet temperature detected by the condenser outlet temperature sensor and the first condenser outlet temperature is greater than or equal to zero, and whether the difference between the second compressor exhaust temperature detected by the compressor exhaust temperature sensor and the first preset exhaust temperature is greater than or equal to zero. If the difference between the outlet temperature of the second evaporator and the outlet temperature of the first evaporator is less than zero, the difference between the outlet temperature of the second condenser and the outlet temperature of the first condenser is greater than or equal to zero, or the difference between the exhaust temperature of the second compressor and the first preset exhaust temperature is greater than or equal to zero, then it is determined that the corresponding temperature sensor has malfunctioned. If the difference between the outlet temperature of the second evaporator and the outlet temperature of the first evaporator is greater than or equal to zero, the difference between the outlet temperature of the second condenser and the outlet temperature of the first condenser is less than zero, and the difference between the discharge temperature of the second compressor and the first preset discharge temperature is less than zero, then refrigerant recovery continues. Based on the current outlet temperature of the second evaporator detected by the evaporator outlet temperature sensor, the outlet temperature of the second condenser detected by the condenser outlet temperature sensor, and the discharge temperature of the second compressor detected by the compressor discharge temperature sensor, it is determined whether a temperature sensor malfunction has occurred.

3. The method according to claim 2, characterized in that, Based on the current evaporator outlet temperature detected by the evaporator outlet temperature sensor, the second condenser outlet temperature detected by the condenser outlet temperature sensor, and the second compressor discharge temperature detected by the compressor discharge temperature sensor, determine whether a temperature sensor malfunction has occurred, including: Determine whether the second evaporator outlet temperature detected by the current evaporator outlet temperature sensor is within the range of the second preset evaporator outlet temperature, whether the second condenser outlet temperature detected by the condenser outlet temperature sensor is within the range of the second preset condenser outlet temperature, and whether the second compressor exhaust temperature detected by the compressor exhaust temperature sensor is within the range of the second preset exhaust temperature. If it is determined that the outlet temperature of the second evaporator is not within the range of the second preset evaporator outlet temperature, the outlet temperature of the second condenser is not within the range of the second preset condenser outlet temperature, or the discharge temperature of the second compressor is not within the range of the second preset discharge temperature, then it is determined that the corresponding temperature sensor has malfunctioned. If the outlet temperature of the second evaporator is determined to be within the second preset evaporator outlet temperature range, the outlet temperature of the second condenser is within the second preset condenser outlet temperature range, and the discharge temperature of the second compressor is within the second preset discharge temperature range, then the refrigerant recovery completion stage is entered.

4. The method according to claim 2 or 3, characterized in that, Based on the refrigerant recovery stage of the air conditioner, and combining the evaporator outlet temperature detected by the evaporator outlet temperature sensor, the condenser outlet temperature detected by the condenser outlet temperature sensor, and / or the compressor discharge temperature detected by the compressor discharge temperature sensor, determining whether the evaporator outlet temperature sensor, the condenser outlet temperature sensor, and / or the compressor discharge temperature sensor are faulty, further includes: During the refrigerant recovery completion stage, determine whether the third evaporator outlet temperature detected by the current evaporator outlet temperature sensor is greater than or equal to the difference between the indoor ambient temperature and the preset temperature value, and less than or equal to the sum of the indoor ambient temperature and the preset temperature value; whether the third condenser outlet temperature detected by the condenser outlet temperature sensor is greater than or equal to the difference between the outdoor ambient temperature and the preset temperature value, and less than or equal to the sum of the outdoor ambient temperature and the preset temperature value; and whether the third compressor exhaust temperature detected by the compressor exhaust temperature sensor is greater than or equal to the difference between the outdoor ambient temperature and the preset temperature value, and less than or equal to the sum of the outdoor ambient temperature and the preset temperature value. If the outlet temperature of the third evaporator is greater than or equal to the difference between the indoor ambient temperature and the preset temperature, and less than or equal to the sum of the indoor ambient temperature and the preset temperature; the outlet temperature of the third condenser is greater than or equal to the difference between the outdoor ambient temperature and the preset temperature, and less than or equal to the sum of the outdoor ambient temperature and the preset temperature; and the exhaust temperature of the third compressor is greater than or equal to the difference between the outdoor ambient temperature and the preset temperature, and less than or equal to the sum of the outdoor ambient temperature and the preset temperature, then the refrigerant recovery is determined to be complete; otherwise, the corresponding temperature sensor is determined to be faulty.

5. A refrigerant recovery control device for an air conditioner, characterized in that, include: The first judgment unit is used to determine the refrigerant recovery stage of the air conditioner during refrigerant recovery based on the evaporator outlet temperature detected by the evaporator outlet temperature sensor, the condenser outlet temperature detected by the condenser outlet temperature sensor, the compressor discharge temperature detected by the compressor discharge temperature sensor, and the high-pressure value of the air conditioner. This includes: The system determines the temperature ranges of the evaporator outlet temperature, condenser outlet temperature, and compressor discharge temperature within the preset refrigerant recovery stages, corresponding to the evaporator outlet temperature range, condenser outlet temperature range, and compressor discharge temperature range, and the pressure range of the high-pressure value within the preset high-pressure pressure range corresponding to the preset refrigerant recovery stages. Based on these temperature ranges and the pressure range of the high-pressure value within the preset high-pressure pressure range corresponding to the preset refrigerant recovery stages, the system determines the refrigerant recovery stage of the air conditioner. The refrigerant recovery stages include: a pre-refrigerant recovery stage, a mid-refrigerant recovery stage, and a refrigerant recovery completion stage. The second judgment unit is used to determine whether the evaporator outlet temperature sensor, the condenser outlet temperature sensor, and / or the compressor exhaust temperature sensor are faulty, based on the refrigerant recovery stage determined by the first judgment unit and in conjunction with the evaporator outlet temperature detected by the evaporator outlet temperature sensor, the condenser outlet temperature sensor detected by the condenser outlet temperature sensor, and / or the compressor exhaust temperature sensor detected by the compressor exhaust temperature sensor. This includes: Before refrigerant recovery, it is determined whether the first evaporator outlet temperature detected by the evaporator outlet temperature sensor, the first condenser outlet temperature detected by the condenser outlet temperature sensor, and the first compressor discharge temperature detected by the compressor discharge temperature sensor are within the first preset discharge temperature range. If it is determined that the first evaporator outlet temperature, the first condenser outlet temperature, or the first compressor discharge temperature are not within the first preset discharge temperature range, then the corresponding temperature sensor is identified as faulty. If it is determined that the first evaporator outlet temperature, the first condenser outlet temperature, and the first compressor discharge temperature are all within the first preset discharge temperature range, then the refrigerant recovery process begins.

6. A storage medium, characterized in that, It stores a computer program that, when executed by a processor, implements the steps of the method according to any one of claims 1-4.

7. An air conditioner, characterized in that, It includes a processor, a memory, and a computer program stored in the memory that can run on the processor, wherein the processor executes the program to implement the steps of any one of claims 1-4.

8. An air conditioner, characterized in that, Includes the refrigerant recovery control device as described in claim 5.

9. A computer program product, characterized in that, Includes a computer program, which, when executed by a processor, implements the steps of the method according to any one of claims 1-4.

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