Air conditioner refrigerant amount adjusting method, device and air conditioner

Abstract

The application provides an air conditioner refrigerant amount adjusting method and device and an air conditioner, and belongs to the technical field of air conditioners. The air conditioner refrigerant amount adjusting method and device adjust the opening degree of an air conditioner expansion valve according to the interval of the internal temperature of an outdoor heat exchanger when the air conditioner is in a high-temperature refrigeration state, so as to adjust the refrigerant amount. When the air conditioner is refrigerating, the compressor discharges into the outdoor heat exchanger, and the pressure is almost unchanged, that is, the internal temperature of the outdoor heat exchanger can be regarded as the temperature corresponding to the discharge pressure. Therefore, the opening degree of the expansion valve is adjusted through the size relationship among the internal temperature of the outdoor heat exchanger, the first threshold value and the second threshold value, the refrigerant amount can be accurately adjusted, the refrigerant amount is always in a suitable range, the operation effect of the air conditioner is ensured, the service life of the air conditioner is prolonged, the user experience is improved, and energy saving and emission reduction are achieved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to an air conditioning refrigerant dosage adjustment method, device, and air conditioner. Background Technology

[0002] The refrigerant charge is one of the important parameters affecting air conditioner operation. Insufficient refrigerant charge can lead to refrigerant shortage, affecting cooling performance and user experience. Excessive charge can cause incomplete refrigerant evaporation, resulting in liquid refrigerant returning to the compressor and damaging it, thus shortening the air conditioner's lifespan. This is especially true for fixed-frequency air conditioners. Under high-temperature cooling conditions, because they cannot adjust the compressor frequency according to system pressure and temperature, they may shut down due to excessive pressure, severely impacting user experience, the air conditioner's lifespan, and reliability.

[0003] Although current fixed-frequency air conditioners have the function of automatically adjusting the amount of refrigerant, they generally suffer from low adjustment accuracy. Summary of the Invention

[0004] The problem improved by this invention is the low accuracy of automatic refrigerant dosage adjustment in related technologies.

[0005] To improve the above problems,

[0006] In a first aspect, the present invention provides a method for adjusting the refrigerant charge in an air conditioner, comprising:

[0007] Obtain the internal temperature of the outdoor heat exchanger when the air conditioner is in a high-temperature cooling state;

[0008] The opening of the expansion valve is adjusted to regulate the refrigerant charge based on the relationship between the internal temperature of the outdoor heat exchanger, the first threshold, and the second threshold, wherein the first threshold is less than the second threshold.

[0009] The step of "adjusting the opening of the expansion valve to adjust the refrigerant charge based on the relationship between the internal temperature of the outdoor heat exchanger, the first threshold, and the second threshold" specifically includes:

[0010] When the temperature inside the outdoor heat exchanger is greater than or equal to the first threshold and less than or equal to the second threshold, the exhaust superheat is obtained;

[0011] The opening of the expansion valve is adjusted according to the relationship between the exhaust superheat, the third threshold, and the fourth threshold to adjust the refrigerant charge, wherein the third threshold is less than the fourth threshold.

[0012] This air conditioning refrigerant charge adjustment method regulates the refrigerant charge by adjusting the opening of the expansion valve based on the temperature range inside the outdoor heat exchanger when the air conditioner is in high-temperature cooling mode. During air conditioning cooling, the compressor discharges into the outdoor heat exchanger at almost constant pressure; therefore, the temperature inside the outdoor heat exchanger can be considered the temperature corresponding to the discharge pressure. By adjusting the opening of the expansion valve according to the relationship between the temperature inside the outdoor heat exchanger, the first threshold, and the second threshold, the refrigerant charge can be accurately adjusted, ensuring that the refrigerant charge remains within a suitable range. This guarantees the air conditioner's operating performance, extends its lifespan, improves user experience, and achieves energy conservation and emission reduction.

[0013] When the internal temperature of the outdoor heat exchanger is between the first and second thresholds, it indicates that the exhaust pressure is within the normal range. At this time, it is necessary to further detect the exhaust superheat. The opening of the expansion valve should be adjusted according to the relationship between the exhaust superheat, the third threshold, and the fourth threshold, so as to further improve the accuracy of the adjustment.

[0014] In an optional implementation, the first threshold is 42°-48° and the second threshold is 57°-63°.

[0015] In an optional implementation, the step of "adjusting the opening of the expansion valve to adjust the refrigerant charge based on the relationship between the exhaust superheat, the third threshold, and the fourth threshold" specifically includes:

[0016] If the exhaust superheat is greater than or equal to the third threshold and less than or equal to the fourth threshold, repeat the step of "obtaining exhaust superheat" until the exhaust superheat is less than the third threshold or greater than the fourth threshold;

[0017] If the exhaust superheat is less than the third threshold, reduce the opening of the expansion valve to reduce the refrigerant charge;

[0018] If the exhaust superheat is greater than the fourth threshold, the return gas superheat is obtained, and the opening of the expansion valve is adjusted according to the relationship between the return gas superheat, the fifth threshold, and the sixth threshold to adjust the refrigerant charge, wherein the fifth threshold is less than the sixth threshold.

[0019] If the exhaust superheat is between the third and fourth thresholds, it indicates that the exhaust superheat is within the normal range. No adjustment of the expansion valve opening is necessary; simply maintain the existing opening and continue monitoring the exhaust superheat. If the exhaust superheat is less than the third threshold, it indicates that the exhaust superheat is too low, resulting in incomplete refrigerant evaporation. Liquid refrigerant may enter the compressor and damage related components. Therefore, the expansion valve opening needs to be reduced to decrease the refrigerant charge. If the exhaust superheat is greater than the fourth threshold, it indicates that the exhaust superheat is too high, resulting in insufficient refrigerant and affecting the cooling effect. In this case, further monitoring of the return gas superheat is necessary. The expansion valve opening should be adjusted based on the relationship between the return gas superheat, the fifth threshold, and the sixth threshold to further improve the accuracy of refrigerant charge adjustment.

[0020] In an optional implementation, the third threshold is 20°-24° and the fourth threshold is 26°-30°.

[0021] In an optional implementation, the step of "adjusting the opening of the expansion valve to adjust the refrigerant charge based on the relationship between the return gas superheat, the fifth threshold, and the sixth threshold" includes:

[0022] If the return gas superheat is greater than or equal to the fifth threshold and less than or equal to the sixth threshold, return to the step of "obtaining the internal temperature of the outdoor heat exchanger when the air conditioner is in a high-temperature cooling state";

[0023] If the return gas superheat is less than the fifth threshold, reduce the opening of the expansion valve to reduce the refrigerant charge.

[0024] If the return gas superheat is greater than the sixth threshold, the opening of the expansion valve is increased to increase the refrigerant charge.

[0025] When the return gas superheat is between the fifth and sixth thresholds, it indicates that the return gas superheat is within a suitable range. Since the return gas superheat has a significant impact on the air conditioning cooling performance, it is not necessary to adjust the opening of the expansion valve at this time. The expansion valve should be maintained at its current opening, and the process of obtaining the internal temperature of the condenser can be resumed. If the return gas superheat is less than the fifth threshold, it indicates that the return gas superheat is too low, the refrigerant evaporation is incomplete, and liquid refrigerant may enter the compressor and damage related compressor components. Therefore, it is necessary to reduce the opening of the expansion valve to reduce the amount of refrigerant. If the return gas superheat is greater than the sixth threshold, it indicates that the return gas superheat is too high, the refrigerant is insufficient, and the cooling effect is poor. Therefore, it is necessary to increase the opening of the expansion valve to increase the amount of refrigerant.

[0026] In an optional implementation, the fifth threshold is 1° and the sixth threshold is 4°.

[0027] In an optional implementation, the step of "adjusting the opening of the expansion valve to adjust the refrigerant charge based on the relationship between the internal temperature of the outdoor heat exchanger, the first threshold, and the second threshold" specifically includes:

[0028] When the temperature inside the outdoor heat exchanger is less than a first threshold or greater than a second threshold, the motor speed and motor current of the outdoor unit of the air conditioner are obtained.

[0029] If the motor speed is within a preset speed range and the motor current is within a preset current range, the internal temperature of the outdoor heat exchanger is obtained again.

[0030] The opening of the expansion valve is adjusted according to the relationship between the re-acquired indoor temperature of the outdoor heat exchanger, the first threshold, and the second threshold to regulate the refrigerant charge.

[0031] If the temperature inside the outdoor heat exchanger is lower than the first threshold or higher than the second threshold, it indicates that the exhaust pressure is in an abnormal range. In this case, further testing and judgment are needed to determine whether the problem is caused by a motor failure in the outdoor unit. After ruling out the influence of motor failure, the temperature inside the outdoor heat exchanger should be tested again. Based on the retested temperature inside the outdoor heat exchanger, the first threshold, and the second threshold, the opening of the expansion valve should be adjusted to allow for more accurate adjustment of the refrigerant charge.

[0032] In an optional implementation, the step of "adjusting the opening of the expansion valve to adjust the refrigerant charge based on the relationship between the re-acquired indoor temperature of the outdoor heat exchanger, the first threshold, and the second threshold" specifically includes:

[0033] If the temperature inside the outdoor heat exchanger is lower than the first threshold again, the opening of the expansion valve is increased to increase the amount of refrigerant.

[0034] If the temperature inside the outdoor heat exchanger is again greater than the second threshold, the opening of the expansion valve is reduced to reduce the amount of refrigerant.

[0035] If the temperature inside the outdoor heat exchanger is still lower than the first threshold, it indicates that the discharge pressure is too low and the refrigerant is insufficient. Therefore, the opening of the expansion valve needs to be increased to increase the amount of refrigerant. If the temperature inside the outdoor heat exchanger is still higher than the second threshold, it indicates that the discharge pressure is too high and the refrigerant is not completely evaporated. Liquid refrigerant may enter the compressor and damage related components. Therefore, the opening of the expansion valve needs to be reduced to reduce the amount of refrigerant.

[0036] In an optional implementation, the increased cooling dose is less than the decreased cooling dose.

[0037] In an optional implementation, the step of "adjusting the opening of the expansion valve to adjust the refrigerant charge based on the relationship between the internal temperature of the outdoor heat exchanger, the first threshold, and the second threshold" specifically includes:

[0038] When the temperature inside the outdoor heat exchanger is less than a first threshold or greater than a second threshold, the motor speed and motor current of the outdoor unit of the air conditioner are obtained.

[0039] If the motor speed is not within the preset speed range or the motor current is not within the preset current range, record the number of times the speed and current are acquired and determine whether the number of times the speed and current are acquired is greater than or equal to the seventh threshold.

[0040] If the number of times the rotational speed and current are acquired is greater than or equal to the seventh threshold, a fault message is issued and the number of times the rotational speed and current are acquired is reset to zero.

[0041] In a second aspect, the present invention provides an air conditioning refrigerant dosage regulating device, comprising:

[0042] The acquisition module is used to acquire the internal temperature of the outdoor heat exchanger when the air conditioner is in a high-temperature cooling state;

[0043] The adjustment module is used to adjust the opening of the expansion valve to adjust the refrigerant charge based on the relationship between the internal temperature of the outdoor heat exchanger, a first threshold, and a second threshold. When the internal temperature of the outdoor heat exchanger is greater than or equal to the first threshold and less than or equal to the second threshold, the module obtains the exhaust superheat and adjusts the opening of the expansion valve to adjust the refrigerant charge based on the relationship between the exhaust superheat, a third threshold, and a fourth threshold, wherein the first threshold is less than the second threshold, and the third threshold is less than the fourth threshold.

[0044] This air conditioning refrigerant charge regulating device adjusts the opening of the expansion valve based on the temperature range of the outdoor heat exchanger when the air conditioner is in high-temperature cooling mode, thereby regulating the refrigerant charge. By adjusting the opening of the expansion valve according to the relationship between the outdoor heat exchanger internal temperature, a first threshold, and a second threshold, the refrigerant charge can be accurately regulated, ensuring that the refrigerant charge is always within an appropriate range. This guarantees the air conditioner's operating effect, extends its service life, improves user experience, and achieves energy saving and emission reduction. When the outdoor heat exchanger internal temperature is between the first and second thresholds, it indicates that the exhaust pressure is within the normal range. At this time, it is necessary to further detect the exhaust superheat. The opening of the expansion valve is adjusted according to the relationship between the exhaust superheat, a third threshold, and a fourth threshold, thereby further improving the accuracy of the regulation.

[0045] Thirdly, the present invention provides an air conditioner, including a controller, the controller being used to execute the air conditioner refrigerant dosage adjustment method described in any of the foregoing embodiments.

[0046] This air conditioner adjusts the opening of its expansion valve based on the temperature range of the outdoor heat exchanger under high-temperature cooling conditions, thereby regulating the refrigerant charge. By adjusting the expansion valve opening according to the relationship between the outdoor heat exchanger's internal temperature, a first threshold, and a second threshold, the refrigerant charge can be accurately adjusted, ensuring that the refrigerant charge remains within an appropriate range. This guarantees the air conditioner's operating performance, extends its lifespan, improves user experience, and achieves energy conservation and emission reduction. When the outdoor heat exchanger's internal temperature is between the first and second thresholds, it indicates that the exhaust pressure is within the normal range. At this point, it is necessary to further test the exhaust superheat. The opening of the expansion valve is then adjusted based on the relationship between the exhaust superheat, a third threshold, and a fourth threshold, further improving the accuracy of the adjustment. Attached Figure Description

[0047] Figure 1 This is a control block diagram of an air conditioner provided in the first embodiment of the present invention;

[0048] Figure 2 A flowchart of an air conditioning refrigerant dosage adjustment method provided in the second embodiment of the present invention;

[0049] Figure 3 A flowchart of the sub-steps of step S200 provided in the second embodiment of the present invention;

[0050] Figure 4 A schematic diagram of a temperature and pressure comparison table provided in the second embodiment of the present invention;

[0051] Figure 5 This is a flowchart of the sub-steps of step S220 provided in the second embodiment of the present invention;

[0052] Figure 6 This is a flowchart of the sub-steps of step S226 provided in the second embodiment of the present invention;

[0053] Figure 7 This is a flowchart of the sub-steps of step S234 provided in the second embodiment of the present invention;

[0054] Figure 8 This is a structural block diagram of an air conditioning refrigerant dosage regulating device provided in the third embodiment of the present invention.

[0055] Explanation of reference numerals in the attached figures:

[0056] 100-Controller; 200-Outdoor heat exchanger temperature sensor; 300-Exhaust gas temperature sensor; 400-Return gas temperature sensor; 500-Return gas pressure sensor; 600-Motor; 700-Expansion valve; 800-Air conditioning refrigerant dosage regulating device; 810-Acquisition module; 820-Regulation module. Detailed Implementation

[0057] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0058] First embodiment:

[0059] Please refer to Figure 1 This invention provides an air conditioner, which includes an outdoor heat exchanger temperature sensor 200, a controller 100, and an expansion valve 700. The outdoor heat exchanger temperature sensor 200 is disposed inside the outdoor heat exchanger (generally in the middle of the outdoor heat exchanger coil) and is used to detect the internal temperature T0 of the outdoor heat exchanger and send it to the controller 100. The controller 100 communicates with both the outdoor heat exchanger temperature sensor 200 and the expansion valve 700.

[0060] Furthermore, the air conditioner also includes an exhaust temperature sensor 300, a return gas temperature sensor 400, a return gas pressure sensor 500, and a motor 600 for the outdoor unit, all of which communicate with the controller 100. The exhaust temperature sensor 300 is located at the exhaust end of the compressor and is used to detect the exhaust temperature T. P The signal is sent to the controller 100. The return gas temperature sensor 400 is located at the return gas end of the compressor and is used to detect the return gas temperature T. h The signal is sent to the controller 100. The return gas pressure sensor 500 is located at the return gas end of the compressor and is used to detect the return gas pressure P. h And send it to controller 100. The motor 600 of the outdoor unit of the air conditioner can send its own speed and current (i.e., motor speed R and motor current I) to controller 100.

[0061] The controller 100 is used to perform an air conditioning refrigerant charge adjustment method: when the air conditioner is in a high-temperature cooling state, the internal temperature T0 of the outdoor heat exchanger is obtained; the opening of the expansion valve 700 is adjusted according to the relationship between the internal temperature T0 of the outdoor heat exchanger, a first threshold, and a second threshold to adjust the refrigerant charge; when the internal temperature T0 of the outdoor heat exchanger is greater than or equal to the first threshold and less than or equal to the second threshold, the exhaust superheat ΔT1 is obtained, and the opening of the expansion valve 700 is adjusted according to the relationship between the exhaust superheat ΔT1, a third threshold, and a fourth threshold to adjust the refrigerant charge, wherein the first threshold is less than the second threshold, and the third threshold is less than the fourth threshold.

[0062] The controller 100 can be the controller of the outdoor unit or the controller of the indoor unit of the air conditioner. In this embodiment, since the expansion valve 700, the motor 600, and all sensors are located on the outdoor unit, the controller 100 is the controller of the outdoor unit to facilitate electrical connection and simplify the signal transmission process. That is, the above-mentioned air conditioning refrigerant charge adjustment method is executed by the controller of the outdoor unit. In other embodiments, the controller 100 can also be the controller of the indoor unit. In this case, the above-mentioned air conditioning refrigerant charge adjustment method is executed by the controller of the indoor unit. The controller of the indoor unit receives signals from the outdoor heat exchanger temperature sensor 200, etc., through the controller of the outdoor unit with which it communicates, and issues opening adjustment commands to the expansion valve 700.

[0063] The expansion valve 700 can be selected from different types as needed. In this embodiment, the expansion valve 700 is an electronic expansion valve. In other embodiments, the expansion valve can also be a thermostatic expansion valve that can adjust its opening degree according to an electrical signal.

[0064] This air conditioner adjusts the opening of the expansion valve 700 based on the range of the outdoor heat exchanger's internal temperature T0 under high-temperature cooling conditions, thereby regulating the refrigerant charge. By adjusting the opening of the expansion valve 700 according to the relationship between the outdoor heat exchanger's internal temperature T0, the first threshold, and the second threshold, the refrigerant charge can be accurately adjusted, ensuring that the refrigerant charge remains within an appropriate range. This guarantees the air conditioner's operating performance, extends its lifespan, improves user experience, and achieves energy conservation and emission reduction. When the outdoor heat exchanger's internal temperature T0 is between the first and second thresholds, it indicates that the exhaust pressure is within the normal range. At this point, it is necessary to further detect the exhaust superheat ΔT1. The opening of the expansion valve 700 is then adjusted based on the relationship between the exhaust superheat ΔT1, the third threshold, and the fourth threshold, further improving the accuracy of the adjustment.

[0065] Second embodiment:

[0066] Please refer to Figure 2 This invention provides a method for adjusting the cooling dose of an air conditioner, which is executed by the controller 100 in the first embodiment to adjust the cooling dose of the air conditioner in the first embodiment.

[0067] The air conditioning refrigerant dosage adjustment method includes:

[0068] Step S100: Obtain the internal temperature T0 of the outdoor heat exchanger when the air conditioner is in a high-temperature cooling state.

[0069] The term "high-temperature cooling state" means that the air conditioner is in cooling mode and the outdoor ambient temperature is greater than or equal to the preset temperature (generally 40°C). If the outdoor ambient temperature is lower than the preset temperature, it indicates that the air conditioner is operating well and not in a severe condition. In this case, there is no need to adjust the refrigerant charge; that is, there is no need to follow this air conditioner refrigerant charge adjustment method. It is sufficient to continue monitoring the outdoor ambient temperature. The frequency of monitoring can be determined based on the actual situation, but once per hour is generally recommended.

[0070] After obtaining the internal temperature T0 of the outdoor heat exchanger, step S200 is executed: adjust the opening of the expansion valve 700 to adjust the refrigerant charge according to the relationship between the internal temperature T0 of the outdoor heat exchanger, the first threshold and the second threshold.

[0071] This air conditioning refrigerant dosage adjustment method adjusts the opening of the expansion valve by regulating the relationship between the internal temperature T0 of the outdoor heat exchanger, the first threshold, and the second threshold. This allows for accurate adjustment of the refrigerant dosage, ensuring that it remains within a suitable range, guaranteeing the air conditioner's operating performance, extending its service life, and improving the user experience.

[0072] For details, please refer to Figure 3 Step S200 specifically includes steps S210 and S220.

[0073] If the temperature T0 inside the outdoor heat exchanger is greater than or equal to the first threshold and less than or equal to the second threshold (i.e., T0∈[first threshold, second threshold]), execute step S210: obtain the exhaust superheat ΔT1.

[0074] The first and second thresholds are pre-stored in the controller 100. The first threshold is less than the second threshold. The first threshold is 42°-48°, and the second threshold is 57°-63°. Both can be selected according to actual conditions. In this embodiment, the first threshold is 45° and the second threshold is 60°, because the exhaust pressure corresponding to the outdoor heat exchanger internal temperature T0 of 45°-60° is 2.6-3.7 MPa (refer to...). Figure 4 (Temperature and pressure comparison table), that is, the pressure range is the most suitable pressure range for air conditioner operation. Exhaust superheat △T1 through exhaust temperature T P The calculation is performed based on the internal temperature T0 of the outdoor heat exchanger. Therefore, step S210 specifically includes: Step S212: Obtain the exhaust temperature T. P And step S214: Calculate the exhaust superheat ΔT1, where ΔT1 is equal to the exhaust temperature T. P The difference between the temperature T0 inside the outdoor heat exchanger and the temperature T0 outside the outdoor heat exchanger, i.e., ΔT1 = T P -T0.

[0075] After executing step S210, execute step S220: adjust the opening of expansion valve 700 to adjust the refrigerant charge based on the relationship between the exhaust superheat ΔT1, the third threshold and the fourth threshold.

[0076] When the internal temperature T0 of the outdoor heat exchanger is between the first and second thresholds, it indicates that the exhaust pressure is within the normal range. At this time, it is necessary to further detect the exhaust superheat ΔT1. The opening of the expansion valve 700 is adjusted according to the relationship between the exhaust superheat ΔT1, the third threshold, and the fourth threshold, thereby further improving the accuracy of refrigerant charge adjustment.

[0077] Further, please refer to Figure 5 Step S220 specifically includes:

[0078] If the exhaust superheat ΔT1 is greater than or equal to the third threshold and less than or equal to the fourth threshold (i.e., ΔT1 ∈ [third threshold, fourth threshold]), repeat step S210 (i.e., obtain the exhaust superheat ΔT1) until the exhaust superheat ΔT1 is less than the third threshold or greater than the fourth threshold.

[0079] If the exhaust superheat ΔT1 is less than the third threshold (i.e., ΔT1 < the third threshold), proceed to step S222: reduce the opening of the expansion valve 700 to reduce the refrigerant charge.

[0080] If the exhaust superheat ΔT1 is greater than the fourth threshold (i.e., ΔT1 > the fourth threshold), proceed to step S224: obtain the return superheat ΔT2 and step S226: adjust the opening of the expansion valve 700 to adjust the refrigerant charge based on the relationship between the return superheat ΔT2, the fifth threshold and the sixth threshold.

[0081] The third and fourth thresholds are pre-stored in the controller 100. The third threshold is less than the fourth threshold. The third threshold is between 20° and 24°, and the fourth threshold is between 26° and 30°. These values ​​can be selected as needed. In this embodiment, the third threshold is 23° and the fourth threshold is 27°. The return gas superheat ΔT2 is equal to the return gas temperature T. h and return pressure P h The corresponding temperature T S The difference, i.e., △T 2＝ T h -T S Return pressure P h The corresponding temperature T S According to Figure 4 The temperature and pressure comparison table shown can be used to obtain the values.

[0082] If the exhaust superheat ΔT1 is between the third and fourth thresholds, it indicates that the exhaust superheat ΔT1 is within the normal range. No adjustment of the expansion valve 700 opening is necessary; maintain the current opening of the expansion valve 700 and continuously monitor the exhaust superheat ΔT1 (generally once per hour). If the exhaust superheat ΔT1 is less than the third threshold, it indicates that the exhaust superheat ΔT1 is too low, resulting in incomplete refrigerant evaporation. Liquid refrigerant may enter the compressor and damage related components. Therefore, the opening of the expansion valve 700 needs to be reduced to decrease the refrigerant charge. If the exhaust superheat ΔT1 is greater than the fourth threshold, it indicates that the exhaust superheat ΔT1 is too high, resulting in insufficient refrigerant and affecting the cooling effect. Further monitoring of the exhaust superheat ΔT2 is required. The opening of the expansion valve 700 should be adjusted based on the relationship between the exhaust superheat ΔT2, the fifth threshold, and the sixth threshold to further improve the accuracy of refrigerant charge adjustment.

[0083] Further, please refer to Figure 6 Step S226 specifically includes:

[0084] If the return gas superheat ΔT2 is greater than or equal to the fifth threshold and less than or equal to the sixth threshold (i.e., ΔT2 ∈ [the fifth threshold, the sixth threshold]), return to step S100 (i.e., obtain the indoor temperature T0 of the outdoor heat exchanger when the air conditioner is in a high-temperature cooling state).

[0085] If the return gas superheat ΔT2 is less than the fifth threshold (ΔT2 < fifth threshold), proceed to step S222: reduce the opening of expansion valve 700 to reduce the refrigerant charge;

[0086] If the return gas superheat ΔT2 is greater than the sixth threshold (ΔT2>sixth threshold), proceed to step S228: increase the opening of expansion valve 700 to increase the refrigerant charge.

[0087] The fifth and sixth thresholds are pre-stored in the controller 100. The fifth threshold is smaller than the sixth threshold, and both can be set as needed. In this embodiment, the fifth threshold is 1° and the sixth threshold is 4°.

[0088] When the return gas superheat ΔT2 is between the fifth and sixth thresholds, it indicates that the return gas superheat ΔT2 is within a suitable range. Since the return gas superheat ΔT2 has a significant impact on the air conditioning cooling performance, it is not necessary to adjust the opening of the expansion valve 700 at this time. The expansion valve 700 should be maintained at its current opening, and the process can return to the step of obtaining the condenser internal temperature. If the return gas superheat ΔT2 is less than the fifth threshold, it indicates that the return gas superheat ΔT2 is too low, the refrigerant evaporation is incomplete, and liquid refrigerant may enter the compressor and damage related compressor components. Therefore, it is necessary to reduce the opening of the expansion valve 700 to reduce the refrigerant charge. If the return gas superheat ΔT2 is greater than the sixth threshold, it indicates that the return gas superheat ΔT2 is too high, the refrigerant is insufficient, and the cooling effect is poor. Therefore, it is necessary to increase the opening of the expansion valve 700 to increase the refrigerant charge.

[0089] Please refer to again Figure 3 Step S200 further includes steps S230, S232 and S234.

[0090] When the internal temperature T0 of the outdoor heat exchanger is less than the first threshold or greater than the second threshold (i.e., ... Under the condition of [first threshold, second threshold], execute step S230: obtain the motor speed R and motor current I of the outdoor unit of the air conditioner.

[0091] When the motor speed R is within the preset speed range and the motor current I is within the preset current range, proceed to step S232: obtain the indoor temperature T0 of the outdoor heat exchanger again. And proceed to step S234: adjust the opening of the expansion valve 700 to adjust the refrigerant charge based on the relationship between the newly obtained indoor temperature T0 of the outdoor heat exchanger, the first threshold, and the second threshold.

[0092] The preset speed range is 95%R0-105%R0, and the preset current range is 95%I0-105%I0. R0 is the standard speed of the outdoor unit motor 600 when the air conditioner is running normally, and I0 is the standard current of the outdoor unit motor 600 when the air conditioner is running normally. That is, the motor speed R and the motor current I are both allowed to have an error of ±5%.

[0093] If the internal temperature T0 of the outdoor heat exchanger is less than the first threshold or greater than the second threshold, it indicates that the exhaust pressure is in an abnormal range. At this time, further inspection and judgment are needed to determine whether it is caused by a fault in the motor 600 of the outdoor unit (affecting the motor speed R) or a blockage in the outdoor heat exchanger (affecting the motor current I). After ruling out the influence of the motor 600 fault and the blockage in the outdoor heat exchanger, that is, if the motor speed R is within the preset speed range and the motor current I is within the preset current range, it means that the motor 600 is operating normally and the outdoor heat exchanger is not blocked. At this time, the internal temperature T0 of the outdoor heat exchanger is measured again. Based on the measured internal temperature T0 of the outdoor heat exchanger, the opening of the expansion valve 700 with the first and second thresholds, the refrigerant charge can be adjusted more accurately.

[0094] Further, please refer to Figure 7 Step S234 specifically includes:

[0095] If the temperature T0 inside the outdoor heat exchanger is less than the first threshold (T0 < first threshold) again, step S228 is executed: increase the opening of the expansion valve 700 to increase the refrigerant charge.

[0096] If the outdoor heat exchanger internal temperature T0 is obtained again and is greater than the second threshold (T0 > second threshold), step S222 is executed: reduce the opening of the expansion valve 700 to reduce the refrigerant charge.

[0097] If the outdoor heat exchanger internal temperature T0 is still lower than the first threshold, it indicates that the discharge pressure is too low and the refrigerant is insufficient. Therefore, the opening of the expansion valve 700 needs to be increased to increase the refrigerant charge. If the outdoor heat exchanger internal temperature T0 is still higher than the second threshold, it indicates that the discharge pressure is too high and the refrigerant is not completely evaporated. Liquid refrigerant may enter the compressor and damage related compressor components. Therefore, the opening of the expansion valve 700 needs to be reduced to reduce the refrigerant charge.

[0098] It should be noted that when increasing or decreasing the refrigerant charge in the above steps, the general principle is as follows: increasing the refrigerant charge by 20g-40g is appropriate, and decreasing it by 30g-50g is appropriate. Furthermore, the increase in refrigerant charge in step S236 is less than the decrease in refrigerant charge in step S238. This is to prevent excessively high refrigerant charge increases from causing the air conditioner's return air superheat ΔT2 to become too low, leading to liquid refrigerant entering the compressor and damaging related compressor components. Small, incremental increases better ensure the stability and reliability of the air conditioner's operation.

[0099] Step S200 also includes:

[0100] When the internal temperature T0 of the outdoor heat exchanger is less than the first threshold or greater than the second threshold (i.e., ... Under the condition of [first threshold, second threshold], execute step S230: obtain the motor speed R and motor current I of the outdoor unit of the air conditioner.

[0101] If the motor speed R does not belong to the preset speed range or the motor current I does not belong to the preset current range, execute step S240: record the number of times the speed and current are acquired X and determine whether the number of times the speed and current are acquired X is greater than or equal to the seventh threshold.

[0102] If so, that is, if the number of times the speed current is acquired X is greater than or equal to the seventh threshold, execute step S242: issue a fault message and clear the number of times the speed current is acquired X.

[0103] If not, that is, if the number of times the speed and current are obtained is less than the seventh threshold, return to step S230 (that is, obtain the motor speed R and motor current I of the outdoor unit of the air conditioner).

[0104] The seventh threshold is pre-stored in the controller 100 and can be set as needed. In this embodiment, the second threshold is 2, meaning that if the motor speed R and motor current I detected in the second test are still within an unreasonable range, a fault message is issued and the number of speed and current acquisitions X is reset to zero. In other embodiments, the second threshold can also be 1, 3, or 4.

[0105] If the internal temperature T0 of the outdoor heat exchanger is less than the first threshold or greater than the second threshold, it indicates that the exhaust pressure is in an abnormal range. Further testing and assessment are needed to determine if the problem is caused by a fault in the outdoor unit's motor 600 or a blockage in the outdoor heat exchanger. If the problem is due to a fault in the motor 600 or a blockage in the outdoor heat exchanger (i.e., the motor speed R is not within the preset speed range, or the motor current I is not within the preset current range), it indicates that the motor 600 itself is not operating normally or that the outdoor heat exchanger is blocked. In this case, the motor speed R and motor current I can be repeatedly tested and the number of tests recorded. If the number of tests is greater than or equal to the seventh threshold, and the motor speed R and motor current I are still not within a reasonable range (i.e., the motor speed R is still not within the preset speed range or the motor current I is still not within the preset current range), it indicates that the air conditioner has a fault that cannot be automatically eliminated. In this case, a fault message must be issued so that relevant personnel can stop the unit to test and troubleshoot the fault. At the same time, the number of speed and current acquisitions X should be reset to zero for subsequent re-accumulation.

[0106] This air conditioning refrigerant charge adjustment method regulates the refrigerant charge by adjusting the opening of the expansion valve 700 based on the range of the outdoor heat exchanger's internal temperature T0 when the air conditioner is in high-temperature cooling mode. During air conditioning cooling, the compressor discharges into the outdoor heat exchanger at almost constant pressure; therefore, the outdoor heat exchanger's internal temperature T0 can be considered the temperature corresponding to the discharge pressure. By adjusting the opening of the expansion valve according to the relationship between the outdoor heat exchanger's internal temperature T0, the first threshold, and the second threshold, the refrigerant charge can be accurately adjusted, ensuring that the refrigerant charge remains within a suitable range. This guarantees the air conditioner's operating performance, extends its lifespan, improves user experience, and achieves energy conservation and emission reduction.

[0107] Third embodiment:

[0108] Please refer to Figure 8 This invention provides an air conditioning refrigerant dosage adjustment device 800, which is applied in the controller 100 of the first embodiment to control the air conditioner in the first embodiment to perform the air conditioning refrigerant dosage adjustment method of the second embodiment.

[0109] This air conditioning refrigerant dosage regulating device 800 includes an acquisition module 810 and an adjustment module 820.

[0110] The acquisition module 810 is used to acquire the internal temperature T0 of the outdoor heat exchanger when the air conditioner is in a high-temperature cooling state. In this embodiment, the acquisition module 810 is used to execute step S100.

[0111] The adjustment module 820 is used to adjust the opening degree of the expansion valve 700 to adjust the refrigerant charge based on the relationship between the internal temperature T0 of the outdoor heat exchanger, a first threshold, and a second threshold, wherein the first threshold is less than the second threshold. In this embodiment, the adjustment module 820 is used to execute step S200.

[0112] This air conditioning refrigerant charge regulating device 800 adjusts the opening of the air conditioning expansion valve 700 based on the range of the outdoor heat exchanger's internal temperature T0 when the air conditioner is in high-temperature cooling mode, thereby regulating the refrigerant charge. By adjusting the opening of the expansion valve 700 according to the relationship between the outdoor heat exchanger's internal temperature T0, a first threshold, and a second threshold, the refrigerant charge can be accurately regulated, ensuring that the refrigerant charge is always within an appropriate range. This guarantees the air conditioner's operating effect, extends its service life, improves user experience, and achieves energy saving and emission reduction. When the outdoor heat exchanger's internal temperature T0 is between the first and second thresholds, it indicates that the exhaust pressure is within the normal range. At this time, it is necessary to further detect the exhaust superheat ΔT1. The opening of the expansion valve 700 is adjusted according to the relationship between the exhaust superheat ΔT1, a third threshold, and a fourth threshold, thereby further improving the accuracy of the regulation.

[0113] It should be noted that the above-mentioned air conditioning cooling capacity adjustment method and device are mainly used for fixed-frequency air conditioners. For variable-frequency air conditioners, since they can adjust the compressor frequency according to system pressure and temperature to ensure the normal operation of the air conditioner, the above-mentioned air conditioning cooling capacity adjustment method and device are not very meaningful for them, but they can still be implemented and adopted according to actual needs.

[0114] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions. In addition, the functional modules in the embodiments of the present invention can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0115] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A method for adjusting the refrigerant charge in an air conditioner, characterized in that, include: Obtain the internal temperature of the outdoor heat exchanger when the air conditioner is in a high-temperature cooling state; The opening of the expansion valve is adjusted to regulate the refrigerant charge based on the relationship between the internal temperature of the outdoor heat exchanger, the first threshold, and the second threshold, wherein the first threshold is less than the second threshold. The step of "adjusting the opening of the expansion valve to adjust the refrigerant charge based on the relationship between the internal temperature of the outdoor heat exchanger, the first threshold, and the second threshold" specifically includes: When the temperature inside the outdoor heat exchanger is greater than or equal to the first threshold and less than or equal to the second threshold, the exhaust superheat is obtained; If the exhaust superheat is greater than or equal to the third threshold and less than or equal to the fourth threshold, repeat the "obtain exhaust superheat" step until the exhaust superheat is less than the third threshold or greater than the fourth threshold; If the exhaust superheat is less than the third threshold, reduce the opening of the expansion valve to reduce the refrigerant charge; If the exhaust superheat is greater than the fourth threshold, the return superheat is obtained; If the return gas superheat is greater than or equal to the fifth threshold and less than or equal to the sixth threshold, return to the step of "obtaining the internal temperature of the outdoor heat exchanger when the air conditioner is in a high-temperature cooling state"; If the return gas superheat is less than the fifth threshold, reduce the opening of the expansion valve to reduce the refrigerant charge. If the return gas superheat is greater than the sixth threshold, the opening of the expansion valve is increased to increase the refrigerant charge, wherein the third threshold is less than the fourth threshold and the fifth threshold is less than the sixth threshold.

2. The air conditioning refrigerant dosage adjustment method according to claim 1, characterized in that, The first threshold is 42°-48°, and the second threshold is 57°-63°.

3. The air conditioning refrigerant dosage adjustment method according to claim 1, characterized in that, The third threshold is 20°-24°, and the fourth threshold is 26°-30°.

4. The air conditioning refrigerant dosage adjustment method according to claim 1, characterized in that, The fifth threshold is 1°, and the sixth threshold is 4°.

5. The air conditioning refrigerant dosage adjustment method according to claim 1, characterized in that, The step of "adjusting the opening of the expansion valve to adjust the refrigerant charge based on the relationship between the internal temperature of the outdoor heat exchanger, the first threshold, and the second threshold" specifically includes: When the temperature inside the outdoor heat exchanger is less than a first threshold or greater than a second threshold, the motor speed and motor current of the outdoor unit of the air conditioner are obtained. If the motor speed is within a preset speed range and the motor current is within a preset current range, the internal temperature of the outdoor heat exchanger is obtained again. The opening of the expansion valve is adjusted according to the relationship between the re-acquired indoor temperature of the outdoor heat exchanger, the first threshold, and the second threshold to regulate the refrigerant charge.

6. The air conditioning refrigerant dosage adjustment method according to claim 5, characterized in that, The step of "adjusting the opening of the expansion valve to adjust the refrigerant charge based on the relationship between the re-acquired indoor temperature of the outdoor heat exchanger, the first threshold, and the second threshold" specifically includes: If the temperature inside the outdoor heat exchanger is lower than the first threshold again, the opening of the expansion valve is increased to increase the amount of refrigerant. If the temperature inside the outdoor heat exchanger is again greater than the second threshold, the opening of the expansion valve is reduced to reduce the amount of refrigerant.

7. The air conditioning refrigerant dosage adjustment method according to claim 6, characterized in that, The increased cooling dose is less than the decreased cooling dose.

8. The air conditioning refrigerant dosage adjustment method according to claim 1, characterized in that, The step of "adjusting the opening of the expansion valve to adjust the refrigerant charge based on the relationship between the internal temperature of the outdoor heat exchanger, the first threshold, and the second threshold" specifically includes: When the temperature inside the outdoor heat exchanger is less than a first threshold or greater than a second threshold, the motor speed and motor current of the outdoor unit of the air conditioner are obtained. If the motor speed is not within the preset speed range or the motor current is not within the preset current range, record the number of times the speed and current are acquired and determine whether the number of times the speed and current are acquired is greater than or equal to the seventh threshold. If the number of times the rotational speed and current are acquired is greater than or equal to the seventh threshold, a fault message is issued and the number of times the rotational speed and current are acquired is reset to zero.

9. An air conditioning refrigerant dosage regulating device, characterized in that, include: The acquisition module is used to acquire the internal temperature of the outdoor heat exchanger when the air conditioner is in a high-temperature cooling state; The adjustment module is used to adjust the opening of the expansion valve to adjust the refrigerant charge based on the relationship between the internal temperature of the outdoor heat exchanger, a first threshold, and a second threshold. When the internal temperature of the outdoor heat exchanger is greater than or equal to the first threshold and less than or equal to the second threshold, the module acquires the exhaust superheat. If the exhaust superheat is greater than or equal to a third threshold and less than or equal to a fourth threshold, the module repeats the "acquiring exhaust superheat" step until the exhaust superheat is less than the third threshold or greater than the fourth threshold. If the exhaust superheat is less than the third threshold, the module reduces the opening of the expansion valve to reduce the refrigerant charge. If the exhaust superheat is greater than the fourth threshold, obtain the return gas superheat; if the return gas superheat is greater than or equal to the fifth threshold and less than or equal to the sixth threshold, return to the step of "obtaining the internal temperature of the outdoor heat exchanger when the air conditioner is in a high-temperature cooling state"; if the return gas superheat is less than the fifth threshold, reduce the opening of the expansion valve to reduce the refrigerant charge; if the return gas superheat is greater than the sixth threshold, increase the opening of the expansion valve to increase the refrigerant charge, wherein the first threshold is less than the second threshold, the third threshold is less than the fourth threshold, and the fifth threshold is less than the sixth threshold.

10. An air conditioner, characterized in that, Includes a controller for performing the air conditioning refrigerant dosage adjustment method according to any one of claims 1-8.

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