Air conditioner

Abstract

The present invention discloses an air conditioner, comprising: a refrigerant circulation circuit; a compressor; an outdoor heat exchanger and an indoor heat exchanger; a four-way valve; a first temperature sensor for detecting the temperature at the top of the compressor; a second temperature sensor for detecting the temperature at the exhaust port of the compressor; a controller configured to perform exhaust control operations on the compressor, including: after controlling the expansion valve to operate at a fixed opening for a first preset time period, controlling the adjustment time of the expansion valve opening according to the difference between the temperature value of the first temperature sensor and the temperature value of the second temperature sensor, so that the temperature value of the first temperature sensor or the temperature value of the second temperature sensor is equal to or approximately equal to the target exhaust temperature of the compressor. The air conditioner according to the present invention can effectively control the actual exhaust temperature of the compressor, truly achieve the target exhaust temperature of the compressor, and further ensure the efficient and stable operation of the air conditioner.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to an air conditioner. Background Art

[0002] During the operation of an air conditioner, it is crucial to precisely control the compressor discharge temperature. The compressor discharge temperature is the temperature of the gas discharged after the compressor compresses the gaseous refrigerant, and its magnitude can vary with different operating conditions of the compressor, etc. When the air conditioner adjusts the indoor temperature, based on different operating conditions of the air conditioner, such as different ambient temperatures, different frequencies of the compressor, etc., the target discharge temperature of the compressor is different. In order to enable the air conditioner to operate efficiently under different operating conditions, it is necessary to timely adjust the compressor discharge temperature to be equal to or approximately equal to the target discharge temperature of the compressor. Adjusting the compressor discharge temperature to be equal to or approximately equal to the target discharge temperature of the compressor can ensure that the air conditioner operates efficiently and stably under the corresponding operating conditions.

[0003] The conventional method for adjusting the compressor discharge temperature is to install an exhaust temperature sensor at the exhaust pipe of the compressor to obtain the exhaust temperature during the operation of the compressor, and adjust it based on the obtained exhaust temperature to be equal to or approximately equal to the target discharge temperature. However, in cases where the refrigerant amount in the air conditioner is insufficient and / or the expansion valve opening is too small, etc., the exhaust temperature sensor may be greatly affected by the external ambient temperature and cannot truly reflect the exhaust temperature, resulting in an incorrect acquisition of the compressor discharge temperature, which leads to an inability to truly and effectively control the compressor discharge temperature, thus unable to truly achieve the target discharge temperature of the compressor, and further unable to ensure the efficient and stable operation of the air conditioner. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, an object of the present invention is to provide an air conditioner that can effectively collect the actual discharge temperature of the compressor, can truly achieve the target discharge temperature of the compressor, and further ensure the efficient and stable operation of the air conditioner.

[0005] An air conditioner according to an embodiment of the present invention includes: a refrigerant circulation circuit that circulates refrigerant in a circuit composed of a compressor, a condenser, an expansion valve, an evaporator, and a four-way valve; a compressor that compresses low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharges it to the condenser; an outdoor heat exchanger and an indoor heat exchanger, where one serves as the condenser and the other serves as the evaporator; a four-way valve that controls the flow direction of the refrigerant in the refrigerant circulation circuit to switch the outdoor heat exchanger and the indoor heat exchanger between serving as the condenser and the evaporator; a first temperature sensor that detects the temperature at the top of the compressor; a second temperature sensor that detects the temperature at the exhaust port of the compressor; a controller configured to perform exhaust control operations on the compressor, including: after controlling the expansion valve to operate at a fixed opening for a first preset period, controlling the adjustment time of the opening of the expansion valve according to the difference between the temperature value of the first temperature sensor and the temperature value of the second temperature sensor, so that the temperature value of the first temperature sensor or the temperature value of the second temperature sensor is equal to or approximately equal to the target exhaust temperature of the compressor.

[0006] Therefore, for the air conditioner according to the embodiment of the present invention, by providing a first temperature sensor for detecting the temperature at the top of the compressor and a second temperature sensor for detecting the temperature at the exhaust port of the compressor, and configuring the controller to control the expansion valve to operate at a fixed opening for a first preset period and then control the adjustment time of the opening of the expansion valve according to the difference between the temperature value of the first temperature sensor and the temperature value of the second temperature sensor, so that the temperature value of the first temperature sensor or the temperature value of the second temperature sensor is equal to or approximately equal to the target exhaust temperature of the compressor, the actual exhaust temperature of the compressor can be truly reflected, thereby avoiding the incorrect acquisition of the actual exhaust temperature of the compressor, and further realizing the effective control of the actual exhaust temperature of the compressor, being able to truly make the actual exhaust temperature of the compressor equal to or approximately equal to the target exhaust temperature of the compressor, and further ensuring the efficient and stable operation of the air conditioner.

[0007] According to some embodiments of the present invention, the controller is specifically configured as follows: if the absolute value of the difference between the temperature value of the first temperature sensor and the temperature value of the second temperature sensor is equal to or lower than a first preset temperature difference value, then adjust the opening degree of the expansion valve at a first time interval according to the difference between the temperature value of the second temperature sensor and the target exhaust temperature, so that the temperature value of the second temperature sensor is equal to or approximately equal to the target exhaust temperature of the compressor; if the absolute value is between the first preset temperature difference value and a second preset temperature difference value, then adjust the opening degree of the expansion valve at a second time interval according to the difference between the average value of the temperature values of the first temperature sensor and the second temperature sensor and the target exhaust temperature, so that the temperature value of the first temperature sensor is equal to or approximately equal to the target exhaust temperature of the compressor, where the second preset temperature difference value is greater than the first preset temperature difference value; if the absolute value is higher than or equal to the second preset temperature difference value, then adjust the opening degree of the expansion valve at a third time interval according to the difference between the temperature value of the first temperature sensor and the target exhaust temperature, so that the temperature value of the first temperature sensor is equal to or approximately equal to the target exhaust temperature of the compressor.

[0008] According to some embodiments of the present invention, the second time interval is 1.5 times the first time interval, and the third time interval is 2 times the first time interval.

[0009] According to some embodiments of the present invention, the controller is specifically configured as follows: after controlling the expansion valve to operate at a fixed opening degree for a first preset time period, first determine whether the temperature value of the first temperature sensor is greater than a first preset temperature value; if the determination result is negative, then control the adjustment time of the opening degree of the expansion valve according to the absolute value of the difference between the temperature value of the first temperature sensor and the temperature value of the second temperature sensor; if the determination result is positive, then control the compressor to stop operating and report a refrigerant leakage fault.

[0010] According to some embodiments of the present invention, the air conditioner further includes: a first shut-off valve connected between the four-way valve and one end of the indoor heat exchanger; a second shut-off valve connected between the other end of the indoor heat exchanger and the expansion valve; the controller is further configured to, after controlling the air conditioner to operate for a second preset time period, determine whether the first shut-off valve and the second shut-off valve are open according to the temperature value of the first temperature sensor and the difference between the temperature value of the first temperature sensor and the temperature value of the second temperature sensor.

[0011] According to some embodiments of the present invention, the controller is specifically configured to perform the following operations to determine whether the first stop valve and the second stop valve are opened: determine whether the air conditioner satisfies a first condition and a second condition, wherein the first condition is that the temperature value of the first temperature sensor is lower than or equal to a second preset temperature value, and the second condition is that the difference value is lower than or equal to a third preset temperature difference value; if the air conditioner satisfies the first condition and does not satisfy the second condition, control the opening degree of the expansion valve to increase; after the air conditioner operates for a first time period with the increased opening degree of the expansion valve, determine whether the air conditioner satisfies the first condition, the second condition, and a third condition, wherein the third condition is that the difference between the temperature value of the first temperature sensor and the temperature value of the second temperature sensor is lower than or equal to a fourth preset temperature difference value, and the fourth preset temperature difference value is greater than the third preset temperature difference value; if the air conditioner does not satisfy the first condition and / or the third condition, control the compressor to stop operating and report a system fault.

[0012] According to some embodiments of the present invention, the controller is further specifically configured to perform the following operations to determine whether the first stop valve and the second stop valve are opened: if the air conditioner satisfies the first condition, the second condition, and the third condition, determine that both the first stop valve and the second stop valve have been opened and exit the operation of determining whether the first stop valve and the second stop valve are opened; if the air conditioner satisfies the first condition and the third condition and does not satisfy the second condition, control the compressor to continue operating for a second time period and, after the second time period, obtain the temperature value of the first temperature sensor, the temperature value of the second temperature sensor, and the difference therebetween, and determine whether the air conditioner satisfies the first condition and the second condition; if the air conditioner does not satisfy the first condition or satisfies the first condition but does not satisfy the second condition, control the compressor to stop operating and report a system fault; if the air conditioner satisfies the first condition and the second condition, determine that both the first stop valve and the second stop valve have been opened and exit the operation of determining whether the first stop valve and the second stop valve are opened.

[0013] According to some embodiments of the present invention, the controller is further configured to perform an operation of determining whether there is a refrigerant leak in the air conditioner, including: after controlling the compressor to continuously operate for a third preset time period, obtaining the temperature value of the first temperature sensor and the temperature value of the second temperature sensor and recording the difference therebetween, and determining whether the air conditioner satisfies a fourth condition and a fifth condition, where the fourth condition is that the temperature value of the first temperature sensor is not greater than a third preset temperature value, and the fifth condition is that the temperature difference value is not greater than a fifth preset temperature difference value; if the air conditioner satisfies the fourth condition and does not satisfy the fifth condition, controlling the compressor to continue operating for a fourth preset time period, and after the fourth preset time period, obtaining the temperature value of the first temperature sensor and the temperature value of the second temperature sensor and recording the difference therebetween, and determining whether the air conditioner satisfies the fourth condition and the fifth condition; if the air conditioner satisfies the fourth condition and does not satisfy the fifth condition, controlling the opening degree of the expansion valve to increase, and after the air conditioner operates for a third time period with the increased opening degree of the expansion valve, determining whether the air conditioner satisfies the fourth condition and the fifth condition; if the air conditioner satisfies the fourth condition but does not satisfy the fifth condition, controlling the compressor to stop operating and reporting a refrigerant leak fault; if the air conditioner does not satisfy the fourth condition, controlling the compressor to stop operating and reporting a refrigerant leak fault; if the air conditioner satisfies the fourth condition and the fifth condition, determining that there is no refrigerant leak in the air conditioner and exiting the operation of determining whether there is a refrigerant leak in the air conditioner.

[0014] According to some embodiments of the present invention, the controller is configured to: sequentially perform the operation of determining whether the first cut-off valve and the second cut-off valve are opened and the operation of determining whether there is a refrigerant leak in the air conditioner; and when there is a conflict between the exhaust control operation on the compressor and the operation of determining whether the first cut-off valve and the second cut-off valve are opened, continue to perform the operation of determining whether the first cut-off valve and the second cut-off valve are opened, temporarily interrupt the exhaust control operation on the compressor, and after the conflict disappears, re-perform the operation of adjusting the time for controlling the opening degree of the expansion valve according to the difference between the temperature value of the first temperature sensor and the temperature value of the second temperature sensor; or when there is a conflict between the exhaust control operation on the compressor and the operation of determining whether there is a refrigerant leak in the air conditioner, continue to perform the operation of determining whether there is a refrigerant leak in the air conditioner, temporarily interrupt the exhaust control operation on the compressor, and after the conflict disappears, re-perform the operation of adjusting the time for controlling the opening degree of the expansion valve according to the difference between the temperature value of the first temperature sensor and the temperature value of the second temperature sensor.

[0015] According to some embodiments of the present invention, the temperature probe of the first temperature sensor is a steel piece, and the temperature probe of the second temperature sensor is a copper piece.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] One or more embodiments are illustrated by corresponding drawings, which are not intended to limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation, and in which:

[0018] Figure 1 is a schematic diagram of a conventional air conditioner.

[0019] Figure 2 is a schematic structural block diagram of an air conditioner according to an embodiment of the present invention.

[0020] Figure 3 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention.

[0021] Figure 4 is a structural diagram of a part of an outdoor unit of an air conditioner according to an embodiment of the present invention.

[0022] Figure 5 is a schematic operation flowchart of the exhaust control operation of a compressor by a controller of an air conditioner according to an embodiment of the present invention.

[0023] Figure 6 is a schematic operation flowchart of a controller of an air conditioner for determining whether a first shut-off valve and a second shut-off valve are opened according to an embodiment of the present invention.

[0024] Figure 7 is a schematic operation flowchart of a controller of an air conditioner for determining whether a refrigerant leak occurs in the air conditioner according to an embodiment of the present invention.

[0025] Reference Signs:

[0026] Air conditioner 1000; Refrigerant circulation circuit 10; Compressor 20; Expansion valve 30; Four-way valve 40; Outdoor heat exchanger 50; Indoor heat exchanger 60; First temperature sensor 70; Second temperature sensor 80; Controller 90; First shut-off valve 101; Second shut-off valve 102. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] Embodiments of the present invention will be described in detail below. The embodiments described with reference to the drawings are exemplary. Embodiments of the present invention will be described in detail below.

[0028] Figure 1 It is a schematic diagram of an air conditioner, which can be combined with Figure 1 to understand the basic structure of the air conditioner. In this application, the air conditioner performs a refrigeration / heating cycle by using a compressor, a condenser, an expansion valve, and an evaporator. Among them, the refrigeration cycle includes a series of processes, involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.

[0029] The compressor compresses the refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0030] The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigeration effect by using the latent heat of evaporation of the refrigerant to perform heat exchange with the material to be cooled. In the whole cycle, the air conditioner can adjust the temperature of the indoor space.

[0031] The outdoor unit of the air conditioner refers to the part of the system cycle including the compressor and the outdoor heat exchanger. The indoor unit of the air conditioner includes the indoor heat exchanger, and the expansion valve can be provided in the indoor unit or the outdoor unit.

[0032] The indoor heat exchanger and the outdoor heat exchanger are used as condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner serves as a heater in the heating mode. When the indoor heat exchanger is used as an evaporator, the air conditioner serves as a cooler in the cooling mode.

[0033] The air conditioner according to some embodiments of the present application includes an indoor unit of the air conditioner installed in an indoor space. The indoor unit of the air conditioner is the above-mentioned indoor unit and is connected to the outdoor unit of the air conditioner installed in the outdoor space, that is, the above-mentioned outdoor unit, through a pipe. The outdoor unit of the air conditioner may be provided with a compressor, an outdoor heat exchanger, an outdoor fan, an expander, and similar components of the system cycle. The indoor unit of the air conditioner may also be provided with an indoor heat exchanger and an indoor fan.

[0034] Next, refer to Figures 2 - 7 to describe the air conditioner 1000 according to an embodiment of the present invention.

[0035] As Figures 2 - 4As shown in the figure, the air conditioner 1000 according to an embodiment of the present invention includes a refrigerant circulation circuit 10, a compressor 20, an outdoor heat exchanger 50, an indoor heat exchanger 60, and a four-way valve 40. One of the outdoor heat exchanger 50 and the indoor heat exchanger 60 operates as a condenser, and the other operates as an evaporator. The refrigerant circulation circuit 10 circulates the refrigerant in a circuit composed of the compressor 20, the condenser, the expansion valve 30, the evaporator, and the four-way valve 40. The four-way valve 40 is used to control the flow direction of the refrigerant in the refrigerant circulation circuit 10 so that the outdoor heat exchanger 50 and the indoor heat exchanger 60 can be switched between acting as a condenser and an evaporator.

[0036] The air conditioner 1000 further includes a first temperature sensor 70 and a second temperature sensor 80. Among them, the first temperature sensor 70 is used to detect the temperature at the top of the compressor 20, and the second temperature sensor 80 is used to detect the temperature at the exhaust port of the compressor 20.

[0037] The air conditioner 1000 further includes a controller 90. The controller 90 can be a processor with data processing and analysis functions, such as the CPU (Central Processing Unit / Processor, central processor) in the air conditioner 1000, etc. The controller 90 may include a monitoring unit, a judging unit, a control unit, etc. for realizing data processing and analysis. The controller 90 is configured to perform exhaust control operations on the compressor 20, including: after controlling the expansion valve 30 to operate at a fixed opening for a first preset time period, controlling the adjustment time of the opening of the expansion valve 30 according to the difference between the temperature value of the first temperature sensor 70 and the temperature value of the second temperature sensor 80, so that the temperature value of the first temperature sensor 70 or the temperature value of the second temperature sensor 80 is equal to or approximately equal to the target exhaust temperature of the compressor 20. It can be understood that under different operating parameters and different environmental parameters of the air conditioner 1000, the target exhaust temperature of the compressor 20 is different. The present invention does not impose any restrictions on the method of obtaining the target exhaust temperature of the compressor 20. For example, the target exhaust temperature of the compressor 20 can be known, or can be calculated according to the operating parameters and environmental parameters of the air conditioner 1000, etc. This is all within the scope of the present invention, and the present invention will not elaborate on this in detail.

[0038] Specifically, referring to Figures 3 - 5 , the first temperature sensor 70 can be arranged on the top of the compressor 20 to measure the temperature at the top of the compressor 20; the second temperature sensor 80 can be arranged on the exhaust pipe of the compressor 20 to measure the temperature at the exhaust port of the compressor 20. The controller 90 controls the expansion valve 30 to operate at a fixed opening for a first preset time period (such as Figure 5After the situation shown in S1, the difference TT1 - TP1 between the temperature value TT1 of the first temperature sensor 70 and the temperature value TP1 of the second temperature sensor 80 can be obtained (as shown in Figure 5 S2). For example, after receiving a start command to turn on the heating or cooling mode of the air conditioner 1000, the controller 90 can start the compressor 20 (as shown in Figure 5 S0), and then control the expansion valve 30 to operate at a fixed opening. After the controller 90 controls the expansion valve 30 to operate at a fixed opening for a first preset period, the difference TT1 - TP1 between the temperature value TT1 of the first temperature sensor 70 and the temperature value TP1 of the second temperature sensor 80 is obtained. The first preset period is user-defined. For example, the first preset period is 7 minutes, 8 minutes, 9 minutes, etc., but is not limited thereto. Optionally, the first preset period is 8 minutes.

[0039] After the controller 90 obtains the difference TT1 - TP1 between the temperature value TT1 of the first temperature sensor 70 and the temperature value TP1 of the second temperature sensor 80, it controls the adjustment time of the opening of the expansion valve 30 according to this difference TT1 - TP1, so that the temperature value of the first temperature sensor 70 or the second temperature sensor 80 is equal to or approximately equal to the target exhaust temperature T of the compressor 20 目标 . Specifically, the thermal conductivity of the temperature probe of the second temperature sensor 80 is better than that of the temperature probe of the first temperature sensor 70. Therefore, the second temperature sensor 80 has a faster temperature sensing speed and can quickly respond to the temperature change at the exhaust port of the compressor 20, providing an accurate temperature value in a short time. However, when the refrigerant is insufficient and / or the opening of the expansion valve 30 is too small, the temperature value of the second temperature sensor 80 cannot reflect the true actual exhaust temperature of the compressor 20. In contrast, since the thermal conductivity of the temperature probe of the first temperature sensor 70 is worse than that of the temperature probe of the second temperature sensor 80, the temperature sensing speed of the first temperature sensor 70 is relatively slow, and its response to temperature changes is relatively lagged, but its temperature measurement stability is good. When the refrigerant is insufficient and / or the opening of the expansion valve 30 is too small in the air conditioner 1000, it can relatively accurately represent the actual exhaust temperature of the compressor 20. Therefore, when the refrigerant is insufficient and / or the opening of the expansion valve 30 is too small in the air conditioner 1000, the temperature value TP1 of the second temperature sensor 80 may be significantly lower than the actual exhaust temperature of the compressor 20, and the difference TT1 - TP1 between the temperature value TT1 of the first temperature sensor 70 and the temperature value TP1 of the second temperature sensor 80 may be relatively significant. At this time, the temperature value TT1 of the first temperature sensor 70 can relatively accurately reflect the actual exhaust temperature of the compressor 20. Therefore, the controller 90 makes the temperature value TT1 of the first temperature sensor 70 equal to or approximately equal to the target exhaust temperature T of the compressor 20 目标to adjust the opening degree of the expansion valve 30. Since the first temperature sensor 70 has a slow response speed to temperature changes, the expansion valve 30 is adjusted at a relatively long time interval (i.e., the time interval between two consecutive adjustments of the expansion valve 30 is relatively long). On the contrary, when the difference TT1 - TP1 between the temperature value TT1 of the first temperature sensor 70 and the temperature value TP1 of the second temperature sensor 80 is not significant, it indicates that there is no refrigerant shortage and / or the opening degree of the expansion valve 30 is not too small in the air conditioner 1000. Since the second temperature sensor 80 has a fast response speed to temperature changes, the temperature value TP1 of the second temperature sensor 80 can be considered to truly reflect the actual exhaust temperature of the compressor 20 at this time. Therefore, the controller 90 adjusts the opening degree of the expansion valve 30 at a suitable time interval according to the difference between the temperature value TP1 of the second temperature sensor 80 and the target exhaust temperature T of the compressor 20, so that the temperature value TP1 of the second temperature sensor 80 is equal to or approximately equal to the target exhaust temperature T of the compressor 20. 目标 to adjust the opening degree of the expansion valve 30. Since the second temperature sensor 80 has a fast response speed to temperature changes, the expansion valve 30 is adjusted at a relatively short time interval (i.e., the time interval between two consecutive adjustments of the expansion valve 30 is relatively short).

[0040] The strategy for exhaust control of the compressor adopted by the air conditioner in the prior art is to only set a temperature sensor on the exhaust pipe of the compressor, and control the opening degree of the expansion valve 30 according to the comparison result between the target exhaust temperature and the temperature value of this temperature sensor, so as to finally make the temperature value equal to the target exhaust temperature. Among them, even when there is a refrigerant shortage and / or the expansion valve opening degree is insufficient in the air conditioner, the temperature value of this temperature sensor is still used as the actual exhaust temperature of the compressor. In contrast, the air conditioner 1000 of the present invention can measure the temperature at the top of the compressor 20 and the temperature at the exhaust port of the compressor 20 by using two temperature sensors respectively. It can judge whether there is a refrigerant shortage and / or the expansion valve 30 opening degree is insufficient in the air conditioner 1000 according to the difference between the two, so as to flexibly select the temperature value of the two temperature sensors that can better reflect the actual exhaust temperature of the compressor 20 as the actual exhaust temperature of the compressor 20, and adjust the opening degree of the expansion valve 30 at a suitable time interval according to this difference, so that the temperature value that can better reflect the actual exhaust temperature of the compressor 20 is equal to or approximately equal to the target exhaust temperature T of the compressor 20. 目标 equal or approximately equal. It can be seen that the air conditioner 1000 of the present application can achieve that during the process of exhaust control of the compressor 20, the actual exhaust temperature of the compressor 20 can be truly reflected, thus avoiding the wrong acquisition of the actual exhaust temperature of the compressor 20, and further realizing the effective control of the actual exhaust temperature of the compressor 20, and truly achieving the target exhaust temperature T of the compressor 20. 目标 Furthermore, it ensures that the air conditioner 1000 operates efficiently and stably.

[0041] Therefore, for the air conditioner 1000 according to the embodiment of the present invention, by providing a first temperature sensor 70 for detecting the temperature at the top of the compressor 20 and a second temperature sensor 80 for detecting the temperature at the exhaust port of the compressor 20, and configuring the controller 90 to control the expansion valve 30 to operate at a fixed opening for a first preset time period, and then controlling the adjustment time of the opening of the expansion valve 30 according to the difference between the temperature value of the first temperature sensor 70 and the temperature value of the second temperature sensor 80, so that the temperature value of the first temperature sensor 70 or the temperature value of the second temperature sensor 80 is equal to or approximately equal to the target exhaust temperature of the compressor 20, the actual exhaust temperature of the compressor 20 can be truly reflected, thereby avoiding the miscollection of the actual exhaust temperature of the compressor 20, and further realizing the effective control of the actual exhaust temperature of the compressor 20, and being able to truly make the actual exhaust temperature of the compressor 20 equal to or approximately equal to the target exhaust temperature of the compressor 20, and further ensuring that the air conditioner 1000 operates efficiently and stably.

[0042] According to a further embodiment of the present invention, with reference to Figure 5 , the controller 90 is specifically configured as follows:

[0043] If the absolute value of the difference TT1 - TP1 between the temperature value TT1 of the first temperature sensor 70 and the temperature value TP1 of the second temperature sensor 80 is equal to or lower than the first preset temperature difference value, then according to the difference TP1 - T 目标 between the temperature value TP1 of the second temperature sensor 80 and the target exhaust temperature T 目标 , the opening of the expansion valve 30 is adjusted at a first time interval, so that the temperature value TT1 of the second temperature sensor 80 is equal to or approximately equal to the target exhaust temperature T 目标 of the compressor 20 (as shown in S4 and S41);

[0044] If the absolute value is between the first preset temperature difference value and the second preset temperature difference value, then according to the difference (TT1 + TP1) / 2 - T 目标 between the average value (TT1 + TP1) / 2 of the temperature value TT1 of the first temperature sensor 70 and the temperature value TP1 of the second temperature sensor 80 and the target exhaust temperature T 目标 , the opening of the expansion valve 30 is adjusted at a second time interval, so that the temperature value TT1 of the first temperature sensor 80 is equal to or approximately equal to the target exhaust temperature T 目标 of the compressor 20, where the second preset temperature difference value is greater than the first preset temperature difference value (as shown in S4 and S42);

[0045] If the absolute value is higher than or equal to the second preset temperature difference value, then according to the difference TT1 - T 目标 between the temperature value TT1 of the first temperature sensor 70 and the target exhaust temperature T 目标, to adjust the opening degree of the expansion valve 30 at a third time interval so that the temperature value TT1 of the first temperature sensor 70 is equal to the target exhaust temperature T of the compressor 20 目标 (as shown in S4 and S43).

[0046] Specifically, when the controller 90 determines that the absolute value of the difference TT1 - TP1 between the temperature value TT1 of the first temperature sensor 70 and the temperature value TP1 of the second temperature sensor 80 is equal to or lower than the first preset temperature difference value, it indicates that the temperature value TP1 of the second temperature sensor 80 can be considered to truly reflect the actual exhaust temperature of the compressor 20. Then, according to the difference between the temperature value TP1 of the second temperature sensor 80 and the target exhaust temperature T 目标 TP1 - T 目标 , adjust the opening degree of the expansion valve 30 at a first time interval to finally make the temperature value TP1 of the second temperature sensor 80 equal to or approximately equal to the target exhaust temperature T of the compressor 20 目标 . Optionally, the first preset temperature difference value is 5°C. Of course, the first preset temperature difference value can also be set to other values, such as 4°C or 6°C, etc. Optionally, the first time interval is 90 seconds. Of course, the present invention is not limited thereto, and the first time interval can also be regarded as other values, such as 80 seconds, 85 seconds, 100 seconds, 105 seconds, etc.

[0047] Or, when the controller 90 determines that the absolute value of the difference TT1 - TP1 between the temperature value TT1 of the first temperature sensor 70 and the temperature value TP1 of the second temperature sensor 80 is between the first preset temperature difference value and the second preset temperature difference value, it indicates that the air conditioner 1000 may have insufficient refrigerant and / or insufficient opening degree of the expansion valve 30 at this time. The accuracy of the temperature value TP1 of the second temperature sensor 80 reflecting the actual exhaust temperature of the compressor 20 is affected to a certain extent, and the first temperature sensor 70 cannot particularly accurately reflect the actual exhaust temperature of the compressor 20 due to the lag in response to temperature changes. At this time, the average value of the temperature value TT1 of the first temperature sensor 70 and the temperature value TP1 of the second temperature sensor 80 can relatively accurately reflect the actual exhaust temperature of the compressor 20. Therefore, the controller 90 adjusts the opening degree of the expansion valve 30 at a second time interval according to the difference between the average value (TT1 + TP1) / 2 of the temperature value TT1 of the first temperature sensor 70 and the temperature value TP1 of the second temperature sensor 80 and the target exhaust temperature T 目标 (TT1 + TP1) / 2 - T 目标 , where the second preset temperature difference value is greater than the first preset temperature difference value. Optionally, the second preset temperature difference value is 10°C. Of course, the second preset temperature difference value can also be set to other values, such as 9°C or 11°C. For example, the first preset temperature difference value is 5°C and the second preset temperature difference value is 10°C. Optionally, the second time interval is greater than the first time interval.

[0048] Alternatively, when the controller 90 determines that the absolute value of the difference TT1 - TP1 between the temperature value TT1 of the first temperature sensor 70 and the temperature value TP1 of the second temperature sensor 80 is equal to or higher than the second preset temperature difference value, it indicates that there is a significant temperature difference between the first temperature sensor 70 and the second temperature sensor 80, and the air conditioner 1000 has a situation of insufficient refrigerant and / or insufficient opening of the expansion valve 30. The temperature value TP1 of the second temperature sensor 80 is greatly affected by the external environment and can no longer truly reflect the actual exhaust temperature of the compressor 20. However, since the temperature change of the first temperature sensor 70 has hysteresis and is not significantly affected by the external environment, the temperature value TT1 of the first temperature sensor 70 can be considered to relatively accurately reflect the actual exhaust temperature of the compressor 20. Therefore, the controller 90 adjusts the opening of the expansion valve 30 at a third time interval according to the difference TT1 - T 目标 of the temperature value TT1 of the first temperature sensor 70 and the target exhaust temperature T 目标 .

[0049] Optionally, the second time interval is 1.5 times the first time interval, and the third time interval is 2 times the first time interval. Specifically, when adjusting the opening of the expansion valve 30 according to the difference TP1 - T 目标 between the temperature value TP1 of the second temperature sensor 80 and the target exhaust temperature T 目标 , since the second temperature sensor 80 can respond quickly to temperature changes, the time interval between two consecutive adjustments of the opening of the expansion valve 30 can be short (i.e., the first time interval); when adjusting the opening of the expansion valve 30 according to the difference TT1 - T 目标 between the temperature value TT1 of the first temperature sensor 70 and the target exhaust temperature T 目标 , since the responsiveness of the first temperature sensor 70 to temperature changes has a certain hysteresis, the time interval between two consecutive adjustments of the opening of the expansion valve 30 can be long (i.e., the third time interval); based on a similar principle, when adjusting the opening of the expansion valve 30 according to the difference (TT1 + TP1) / 2 - T 目标 between the average value (TT1 + TP1) / 2 of the temperature value TT1 of the first temperature sensor 70 and the temperature value TP1 of the second temperature sensor 80 and the target exhaust temperature T 目标 , the time interval (i.e., the second time interval) between two consecutive adjustments of the opening of the expansion valve 30 can be between the first time interval and the second time interval. Such a setting can, when adjusting the opening of the expansion valve 30 according to the difference TP1 - T 目标 between the temperature value TP1 of the second temperature sensor 80 and the target exhaust temperature T 目标Adjust the opening degree of the expansion valve 30, and according to the average value (TT1 + TP1) / 2 of the temperature value TT1 of the first temperature sensor 70 and the temperature value TP1 of the second temperature sensor 80 and the target exhaust temperature T 目标 The difference (TT1 + TP1) / 2 - T between them 目标 Adjust the opening degree of the expansion valve 30, and according to the difference TT1 - T between the temperature value TT1 of the first temperature sensor 70 and the target exhaust temperature T 目标 The difference TT1 - T 目标 When adjusting the opening degree of the expansion valve 30, respectively select appropriate time intervals for adjusting the opening degree of the expansion valve 30 to avoid adjusting the opening degree of the expansion valve 30 too frequently and also avoid failing to adjust the opening degree of the expansion valve 30 in time.

[0050] It can be understood that whether the controller 90 adjusts the opening degree of the expansion valve 30 at the first time interval according to the difference TP1 - T between the temperature value TP1 of the second temperature sensor 80 and the target exhaust temperature T 目标 The difference TP1 - T 目标 To adjust the opening degree of the expansion valve 30, and according to the difference (TT1 + TP1) / 2 - T between the average value (TT1 + TP1) / 2 of the temperature value TT1 of the first temperature sensor 70 and the temperature value TP1 of the second temperature sensor 80 and the target exhaust temperature T 目标 The difference (TT1 + TP1) / 2 - T between them 目标 To adjust the opening degree of the expansion valve 30 at the second time interval, or according to the difference TT1 - T between the temperature value TT1 of the first temperature sensor 70 and the target exhaust temperature T 目标 The difference TT1 - T 目标 To adjust the opening degree of the expansion valve 30 at the third time interval, after each adjustment of the opening degree of the expansion valve 30, it is necessary to re-obtain the temperature value TT1 of the first temperature sensor 70, the temperature value TP1 of the second temperature sensor 80, and the difference TT1 - TP1 between them, and control the adjustment time of the opening degree of the expansion valve 30 again according to the difference TT1 - TP1 until the temperature value of the first temperature sensor 70 or the second temperature sensor 80 that can more truly represent the actual exhaust temperature of the compressor 20 is equal to or approximately equal to the target exhaust temperature of the compressor 20.

[0051] Furthermore, referring to Figure 5 , the controller 90 is further configured to perform the following operations: after controlling the expansion valve 30 to operate at a fixed opening degree for the first preset time period, first determine whether the temperature value TT1 of the first temperature sensor 70 is greater than the first preset temperature value;

[0052] If the judgment result is negative, control the adjustment time of the opening degree of the expansion valve 30 according to the absolute value of the difference TT1 - TP1 between the temperature value TT1 of the first temperature sensor 70 and the temperature value TP1 of the second temperature sensor 80;

[0053] If the judgment result is yes, the controller controls the compressor 20 to stop operating and reports a refrigerant leakage fault.

[0054] Specifically, after the controller 90 controls the expansion valve 30 to operate at a fixed opening for a first preset time period (as shown by S1 in Figure 5 ), in other words, before controlling the exhaust temperature of the compressor 20, the controller 90 first determines whether the temperature value TT1 of the first temperature sensor 70 is greater than a first preset temperature value. The first preset temperature value is the upper limit of the operating temperature of the compressor 20. To ensure the normal operation of the compressor 20 and avoid damage to the compressor 20, it is necessary to ensure that the compressor 20 operates at a temperature not higher than this first preset temperature value. Optionally, the first preset temperature value is 115 °C. Of course, the present invention is not limited thereto. Before controlling the exhaust temperature of the compressor 20, by detecting whether the temperature value TT1 of the first temperature sensor 70, i.e., the top temperature of the compressor 20, exceeds the first preset temperature value, it can be determined whether the compressor 20 is operating under safe conditions not higher than the first preset temperature value, i.e., the upper limit of the operating temperature. Specifically, when the controller 90 determines that the temperature value TT1 of the first temperature sensor 70 is not greater than the first preset temperature value, it is considered that the compressor 20 is operating under safe conditions, and then an operation is performed to control the adjustment time of the opening of the expansion valve 30 according to the absolute value of the difference TT1 - TP1 between the temperature value TT1 of the first temperature sensor 70 and the temperature value TP1 of the second temperature sensor 80 to control the exhaust temperature of the compressor 20. On the contrary, when the controller 90 detects that the temperature value TT1 of the first temperature sensor 70 exceeds the first preset temperature value, it is considered that the top temperature of the compressor 20 is too high and this phenomenon may be caused by insufficient refrigerant due to refrigerant leakage. The controller 90 controls the compressor 20 to stop operating and reports a refrigerant leakage fault (as shown by S3 and S31 in Figure 5 ) to avoid damage to the compressor 20.

[0055] According to some embodiments of the present invention, referring to Figure 3 , the air conditioner 1000 further includes a first cut-off valve 101 and a second cut-off valve 102. The first cut-off valve 101 is connected between one end of the four-way valve 40 and the indoor heat exchanger 60, and the second cut-off valve 102 is connected between the other end of the indoor heat exchanger 60 and the expansion valve 30. In other words, the first cut-off valve 101 is the low-pressure valve of the air conditioner 1000, and the second cut-off valve 102 is the high-pressure valve of the air conditioner 1000. When the air conditioner 1000 is in a normal operating state, both the high-pressure valve and the low-pressure valve of the air conditioner 1000 should be in an open state to enable the refrigerant to circulate normally between the indoor unit and the outdoor unit of the air conditioner 1000. Therefore, determining whether the first cut-off valve 101 (i.e., the low-pressure valve) and the second cut-off valve 102 (i.e., the high-pressure valve) are normally open is quite important for determining whether the air conditioner 1000 is operating normally.

[0056] Referring to Figure 3 and in combination with Figure 6 , the controller 90 is further configured to perform an operation of determining whether the first cut-off valve 101 and the second cut-off valve 102 of the air conditioner 1000 are open. Specifically, the controller 90 is further configured to control the air conditioner 1000 to operate for a second preset period (as shown by S1' in Figure 6 ), and then, based on the temperature value TT2 of the first temperature sensor 70 and the difference TT2 - TP2 between the temperature value TT2 of the first temperature sensor 70 and the temperature value TP2 of the second temperature sensor 80, determine whether the first cut-off valve 101 and the second cut-off valve 102 are open. In other words, after the controller 90 receives a cooling or heating start instruction of the air conditioner 1000 and controls the compressor 20 to start (as shown by S0' in Figure 6 ), it controls the air conditioner 1000 to operate for a second preset period (for example, 2 minutes, but not limited thereto) (as shown by S1' in Figure 6 ), and then can obtain the temperature value TT2 of the first temperature sensor 70, the temperature value TP2 of the second temperature sensor 80, and the difference TT2 - TP2 between the temperature value TT2 of the first temperature sensor 70 and the temperature value TP2 of the second temperature sensor 80 (as shown by S5' in Figure 6 ), and based on the temperature value TT2 of the first temperature sensor 70 and the difference TT2 - TP2 between the temperature value TT2 of the first temperature sensor 70 and the temperature value TP2 of the second temperature sensor 80, determine whether the first cut-off valve 101 (i.e., the low-pressure valve) and the second cut-off valve 102 (i.e., the high-pressure valve) are open.

[0057] When both the first stop valve 101 and the second stop valve 102 are in the open state, the refrigerant circulates between the indoor unit and the outdoor unit of the air conditioner 1000. The temperature value TT2 of the first temperature sensor 70 should not be too high, and the difference TT2 - TP2 between the temperature value TT2 of the first temperature sensor 70 and the temperature value TP2 of the second temperature sensor 80 is not significant. On the contrary, when at least one of the first stop valve 101 and the second stop valve 102 is not properly opened, the refrigerant cannot form a cycle between the indoor unit and the outdoor unit of the air conditioner 1000, but the compressor 20 keeps running and its temperature continuously rises due to operation heat. Therefore, the temperature value TT2 measured by the first temperature sensor 70 provided on the top of the compressor 20 is relatively high; and in the case where the refrigerant cannot circulate, the temperature value TP2 measured by the second temperature sensor 80 provided on the exhaust pipe of the compressor 20 is greatly affected by the external environment and may be at a relatively low value. Therefore, the difference TT2 - TP2 between the temperature value TT2 of the first temperature sensor 70 and the temperature value TP2 of the second temperature sensor 80 may be relatively large. Therefore, by using the temperature value TT2 of the first temperature sensor 70 and the difference between the temperature value TT2 of the first temperature sensor 70 and the temperature value TP2 of the second temperature sensor 80, it is possible to accurately determine whether the first stop valve 101 and the second stop valve 102 are opened. Thus, when it is determined that the first stop valve 101 and the second stop valve 102 are not properly opened, corresponding protective measures such as controlling the compressor 20 to stop running can be taken to avoid damage to the air conditioner 1000.

[0058] According to some specific embodiments of the present invention, as Figure 3 shown and referring to Figure 6 , the controller 90 is specifically configured to perform the following operations to determine whether the first stop valve 101 and the second stop valve 102 are opened:

[0059] Determine whether the air conditioner 1000 meets the first condition (as shown in S8' in Figure 6 ) and the second condition (as shown in S10' in Figure 6 ), where the first condition is that the temperature value of the first temperature sensor 70 is lower than or equal to the second preset temperature value, and the second condition is that the above difference is lower than or equal to the third preset temperature difference value;

[0060] If the air conditioner 1000 meets the first condition and does not meet the second condition, control the opening degree of the expansion valve 30 to increase (as shown in S12' in Figure 6 );

[0061] When the air conditioner 1000 operates for the first time period with the opening degree of the expansion valve 30 increased (as shown in Figure 6After that (as shown by S13' in [reference]), it is determined whether the air conditioner 1000 meets the first condition, the second condition, and the third condition. Among them, the third condition is that the difference between the temperature value of the first temperature sensor 70 and the temperature value of the second temperature sensor 80 is lower than or equal to a fourth preset temperature difference value, and the fourth preset temperature difference value is greater than the third preset temperature difference value.

[0062] If the air conditioner 1000 does not meet the first condition and / or the third condition (as Figure 6 shown by S15' in [reference]), then the compressor 20 is controlled to stop operating and a system fault is reported (as Figure 6 shown by S16' in [reference]).

[0063] For example, the second preset temperature value is the upper limit of the operating temperature of the compressor 20. When the temperature value TT2 of the first temperature sensor 70 is greater than the second preset temperature value, the compressor 20 exceeds its maximum safe operating temperature, and the compressor 20 may be damaged if it continues to operate. For example, the second preset temperature value is 115°C, but it is not limited to this. The third preset temperature difference value (such as 7°C, but it is not limited to this) is the maximum difference preset between the temperature value of the first temperature sensor 70 and the temperature value of the second temperature sensor 80 when the first cut-off valve 101 (i.e., the low-pressure valve) and the second cut-off valve 102 (i.e., the high-pressure valve) of the air conditioner 1000 are both correctly opened.

[0064] Specifically, referring to Figure 6 , if the air conditioner 1000 meets the first condition (such as Figure 6 the "Yes" in S8' in [reference]), but does not meet the second condition (such as Figure 6 the "No" in S10' in [reference]), that is, the temperature value TT2 of the first temperature sensor 70 is lower than or equal to the second preset temperature value (for example, 115°C), and the difference TT2 - TP2 between the temperature value TT2 of the first temperature sensor 70 and the temperature value of the second sensor TP2 is greater than the third preset temperature difference value, it is considered that the circulation of the refrigerant in the air conditioner 1000 is blocked, and at least one of the first cut-off valve 101 and the second cut-off valve 102 may not be correctly opened. When the air conditioner 1000 meets the first condition (such as Figure 6 the "Yes" in S8' in [reference]), but does not meet the second condition (such as Figure 6 the "No" in S10' in [reference]), it may also be because the opening degree of the expansion valve 30 is too small to meet the second condition. To eliminate this factor, the controller 90 can control the opening degree of the expansion valve 30 to increase (such as Figure 6 S12' in [reference]), for example, control the opening degree of the expansion valve 30 to be adjusted to the maximum, and the air conditioner 1000 operates for a first time period (such as 2 minutes, but it is not limited to this) with the opening degree of the expansion valve 30 increased (as Figure 6After that as shown by S13’ in [reference], obtain the temperature value TT3 of the first temperature sensor 70, the temperature value TP3 of the second temperature sensor 80, and the difference TT3 - TP3 between the two (as Figure 6 shown by S14’ in [reference]), and determine whether the air conditioner 1000 meets the first condition, the second condition, and the third condition to determine whether the first cutoff valve 101 and the second cutoff valve 102 are opened. Among them, the third condition is that the difference TT3 - TP3 between the temperature value TT3 of the first temperature sensor 70 and the temperature value TP3 of the second temperature sensor 80 is lower than or equal to a fourth preset temperature difference value (for example, 15°C, but not limited to this), and the fourth preset temperature difference value is greater than the third preset temperature difference value. For example, the third preset temperature difference value is 7°C and the fourth preset temperature difference value is 15°C.

[0065] Such as Figure 6 shown by S15’ and S16’ in [reference], if the air conditioner 1000 does not meet the first condition, that is, the temperature value TT3 of the first temperature sensor 70 is higher than the second preset temperature value (for example, 115°), the controller 90 directly controls the compressor 20 to stop running and reports a system fault; or, if the air conditioner 1000 does not meet the third condition, that is, the difference TT3 - TP3 between the temperature value TT3 of the first temperature sensor 70 and the temperature value TP3 of the second temperature sensor 80 is higher than the fourth preset temperature difference value, it means that at least one of the first cutoff valve 101 and the second cutoff valve 102 of the air conditioner 1000 is not opened, then the controller 90 controls the compressor 20 to stop running and reports a system fault; or, if the air conditioner 1000 does not meet the first condition and the third condition, that is, the temperature value TT3 of the first temperature sensor 70 is higher than the second preset temperature value (for example, 115°) and the difference TT3 - TP3 between the temperature value TT3 of the first temperature sensor 70 and the temperature value TP3 of the second temperature sensor 80 is higher than the fourth preset temperature difference value, the controller 90 controls the compressor 20 to stop running and reports a system fault.

[0066] Furthermore, the controller 90 is further specifically configured to perform the following operations to determine whether the first cutoff valve 101 and the second cutoff valve 102 are opened:

[0067] If the air conditioner 1000 meets the first condition, the second condition, and the third condition (such as Figure 6 the “No” in S23’ of [reference]), it is determined that both the first cutoff valve and the second cutoff valve have been opened and the operation of determining whether the first cutoff valve and the second cutoff valve are opened is exited (as Figure 6 shown by S25’ in [reference]);

[0068] If the air conditioner 1000 meets the first condition and the third condition, and does not meet the second condition (such as Figure 6 shown by S17’ in [reference]), then control the compressor 20 to continue running for a second time period (such as Figure 6as shown by S18’ in [reference], and after the second time period, obtain the temperature value of the first temperature sensor 70, the temperature value of the second temperature sensor 80, and the difference between the two (as Figure 6 as shown by S19’ in [reference], and determine whether the air conditioner 1000 meets the first condition (as Figure 6 as shown by S20’ in [reference]) and the second condition (as Figure 6 as shown by S21’ in [reference]);

[0069] If the air conditioner 1000 does not meet the first condition (such as Figure 6 “No” in S20’ in [reference]), or meets the first condition (such as Figure 6 “Yes” in S20’ in [reference]) but does not meet the second condition (such as Figure 6 “No” in S21’ in [reference]), then control the compressor 20 to stop running and report a system fault (as Figure 6 shown by S23’ and S24’ in [reference]);

[0070] If the air conditioner 1000 meets the first condition (such as Figure 6 “Yes” in S20’ in [reference]) and the second condition (such as Figure 6 “Yes” in S21’ in [reference]), then determine that both the first shut-off valve 101 and the second shut-off valve 102 are open and exit the operation of determining whether the first shut-off valve 101 and the second shut-off valve 102 are open (as Figure 6 shown by S22’ in [reference]).

[0071] Specifically, referring to Figure 3 and combining with Figure 6 , when the controller 90 determines that the air conditioner 1000 meets the first condition, the second condition, and the third condition, in other words, determines that the temperature value TT3 of the first temperature sensor 70 of the air conditioner 1000 is less than or equal to the second preset temperature, the difference TT3 - TP3 between the temperature value TT3 of the first temperature sensor 70 and the temperature value TP3 of the second temperature sensor 80 is lower than or equal to the fourth preset temperature difference value, and the difference TT3 - TP3 between the temperature value TT3 of the first temperature sensor 70 and the temperature value TP3 of the second temperature sensor 80 is lower than or equal to the third preset temperature difference value (as Figure 6 shown by S23’ in [reference]), then determine that both the first shut-off valve 101 and the second shut-off valve 102 are open and exit the operation of determining whether the first shut-off valve 101 and the second shut-off valve 101 are open (as Figure 6 shown by S25’ in [reference]). In this case, further, when the controller 90 determines that the air conditioner 1000 meets the first condition, the second condition, and the third condition, control the air conditioner 1000 to run for a predetermined time period (for example, 5 minutes) (as Figure 6 shown by S24’ in [reference]) and then exit the operation of determining whether the first shut-off valve 101 and the second shut-off valve 102 are open.Figure 6 as shown by S25' in

[0072] When the controller 90 determines that the air conditioner 1000 satisfies the first condition and the third condition but does not satisfy the second condition, in other words, when it is determined that the temperature value TT3 of the first temperature sensor 70 in the air conditioner 1000 is less than or equal to the second preset temperature, and the difference TT3 - TP3 between the temperature value TT3 of the first temperature sensor 70 and the temperature value TP3 of the second temperature sensor 80 is lower than or equal to the fourth preset temperature difference value, but the difference TT3 - TP3 between the temperature value TT3 of the first temperature sensor 70 and the temperature value TP3 of the second temperature sensor 80 is higher than the third preset temperature difference value (as Figure 6 shown by S17' in Figure 6 ), in order to prevent the air conditioner 1000 from not entering a stable state sufficient to determine whether the first cut-off valve 101 and the second cut-off valve 102 are opened after operating for the first time period with an increased opening degree of the expansion valve 30, the controller 90 needs to continue to control the compressor 20 to operate for a second time period (for example, 5 minutes, but not limited to this) (as Figure 6 shown by S18' in Figure 6 ), to ensure that the air conditioner 1000 enters a stable state where it can determine whether the first cut-off valve 101 and the second cut-off valve 102 are opened. After this second time period, the controller 90 obtains the temperature value TT4 of the first temperature sensor 70, the temperature value TP4 of the second temperature sensor 80, and the difference TT4 - TP4 between the two (as Figure 6 shown by S19' in Figure 6 ), and determines again whether the air conditioner 1000 satisfies the first condition (as Figure 6 shown by S20' in Figure 6 ), and the second condition (as Figure 6as shown in S27’ in). If the controller 90 determines that the temperature value TT4 of the first temperature sensor 70 is lower than or equal to the second preset temperature value (such as Figure 6 "Yes" in S20’ in) and the difference between the temperature value TT4 of the first temperature sensor 70 and the temperature value TP4 of the second temperature sensor 80 is lower than or equal to the third preset temperature difference value (such as Figure 6 "Yes" in S21’ in), it is determined that both the first shut-off valve 101 and the second shut-off valve 102 are opened and the operation of determining whether the first shut-off valve 101 and the second shut-off valve 102 are opened is exited (such as Figure 6 shown in S22’ in).

[0073] Further, referring to Figure 3 and combining with Figure 6 , in the operation of the controller 90 for determining whether the first shut-off valve 101 and the second shut-off valve 102 of the air conditioner 1000 are opened, the controller 90 is further configured to:

[0074] After controlling the air conditioner 1000 to operate for the second preset time period (such as Figure 6 shown in S1’ in), obtain the temperature value TT1’ of the first temperature sensor 70 and the temperature value TP1’ of the second temperature sensor 80, and record the first difference ΔT1 = TT1’ - TP1’ between the temperature value TT1’ of the first temperature sensor 70 and the temperature value TP1’ of the second temperature sensor 80 (such as Figure 6 shown in S2’ in);

[0075] Determine whether the air conditioner 1000 satisfies the first condition (such as Figure 6 shown in S3’ in);

[0076] If it is determined that the air conditioner 1000 does not satisfy the first condition (such as Figure 6 "No" in S3’ in), control the compressor 20 to stop and report a system fault (such as Figure 6 shown in S4’ in);

[0077] If it is determined that the air conditioner 1000 satisfies the first condition (such as Figure 6 "Yes" in S3’ in), after controlling the air conditioner to continue for the preset time period, obtain the temperature value TT2 of the first temperature sensor 70 and the temperature value TP2 of the second temperature sensor 80, and record the second difference ΔT2 = TT2 - TP2 between the temperature value TT2 of the first temperature sensor 70 and the temperature value TP2 of the second temperature sensor 80 (such as Figure 6 shown in S5’ in);

[0078] Determine whether ΔT1 - ΔT2 is less than or equal to a predetermined threshold (such as Figure 6 shown in S6’ in);

[0079] If it is determined that ΔT1 - ΔT2 is not less than the predetermined threshold value (such as "No" in S6' of Figure 6 ), then exit the operation of determining whether the first stop valve 101 and the second stop valve 102 are open (as shown in S7' of Figure 6 ).

[0080] If it is determined that ΔT1 - ΔT2 is less than the predetermined threshold value (such as "Yes" in S6' of Figure 6 ), then perform the above operation of determining whether the air conditioner 1000 meets the first condition and the second condition (such as S8' and S10' of Figure 6 ).

[0081] Thus, by using ΔT1 - ΔT2, the trend of the exhaust temperature of the compressor can be judged to avoid misjudgment caused by slow heat dissipation and slow temperature reduction of the housing of the compressor 20 after the compressor 20 stops.

[0082] For example, the predetermined threshold value is 2°C, but it is not limited thereto. For example, the predetermined time period is 4 minutes, but it is not limited thereto.

[0083] According to some embodiments of the present invention, with reference to Figure 3 and in combination with Figure 7 as shown, the controller 90 is further configured to perform an operation of determining whether the air conditioner 1000 has a refrigerant leak, including:

[0084] After controlling the compressor 20 to continuously operate for a third preset time period (as shown in S1" of Figure 7 ), obtain the temperature value of the first temperature sensor 70 and the temperature value of the second temperature sensor 80 and record the difference therebetween (as shown in S2" of Figure 7 ), and determine whether the air conditioner 1000 meets the fourth condition (as shown in S3" of Figure 7 ) and the fifth condition (as shown in S5" of Figure 7 ), the fourth condition is that the temperature value of the first temperature sensor 70 is not greater than the third preset temperature value, and the fifth condition is that the temperature difference value is not greater than the fifth preset temperature difference value;

[0085] If the air conditioner 1000 meets the fourth condition (such as "Yes" in S3" of Figure 7 ) and does not meet the fifth condition (such as "No" in S5" of Figure 7 ), control the compressor 20 to continue to operate for a fourth preset time period (as shown in S7" of Figure 7 ), and after the fourth preset time period, obtain the temperature value of the first temperature sensor 70 and the temperature value of the second temperature sensor 80 and record the difference therebetween (as shown in Figure 7as shown in "S8" in Figure 7 as shown in "S9" in Figure 7 and the fifth condition (as shown in "S11" in

[0086] If the air conditioner 1000 meets the fourth condition (such as Figure 7 "Yes" in "S9" in Figure 7 "No" in "S11" in Figure 7 After the air conditioner 1000 operates for the third time period with the opening degree of the expansion valve 30 increased (as shown in "S13" in Figure 7 judge whether the air conditioner 1000 meets the fourth condition (as shown in "S15" in Figure 7 and the fifth condition (as shown in "S16" in

[0087] If the air conditioner 1000 meets the fourth condition (such as Figure 7 "Yes" in "S15" in Figure 7 but does not meet the fifth condition (such as Figure 7 "No" in "S17" in

[0088] then control the compressor 20 to stop running and report a refrigerant leakage fault (as shown in "S18" in Figure 7 "No" in "S15" in Figure 7 then control the compressor 20 to stop running and report a refrigerant leakage fault (as shown in "S16" in

[0089] If the air conditioner 1000 meets the fourth condition (such as Figure 7 "Yes" in "S15" in Figure 7 and the fifth condition (such as Figure 7 "Yes" in "S17" in

[0090] Specifically, the controller 90 controls the compressor 20 to continuously operate for the third preset time period (as shown in "S1"), for example, 25 minutes, but not limited thereto. For example, when the controller 90 receives a cooling or heating start instruction of the air conditioner 1000 and controls the compressor 20 to start (such as Figure 7After that (as shown in “S0” in [reference]), the controller controls the compressor 20 to continuously operate for a third preset time period. After the compressor 20 continuously operates for the third preset time period, the controller 90 obtains the temperature value TT5 of the first temperature sensor 70 and the temperature value TP5 of the second temperature sensor 80 and records the difference TT5 - TP5 between the two (as shown in “S2”). Then, the controller 90 determines whether the temperature value TT5 of the first temperature sensor 70 is greater than a third preset temperature value (for example, 15 °C, but not limited to this) (as shown in “S3”) and whether the temperature difference value TT5 - TP5 is greater than a fifth preset temperature difference value (for example, 10 °C, but not limited to this) (as shown in “S5”). When the controller 90 determines that the temperature value TT5 of the first temperature sensor 70 is greater than the third preset temperature value, it indicates that the air conditioner 1000 does not meet the fourth condition and the compressor 20 exceeds the upper limit of its normal operation. To avoid damage to the compressor 20, the controller 90 controls the compressor 20 to stop operating and reports a refrigerant leakage fault (as shown in “S4”). When the controller 90 determines that the air conditioner 1000 meets the fourth condition (as Figure 7 “Yes” in “S3” in [reference]), but does not meet the fifth condition (as Figure 7 “No” in “S5” in [reference]), that is, the temperature value TT5 of the first temperature sensor 70 is not greater than the third preset temperature value, but the difference between the temperature value TT5 of the first temperature sensor 70 and the temperature value TP5 of the second temperature sensor 80 is greater than the fifth preset temperature difference value, it indicates that the temperature difference between the two temperature sensors is too large. When the refrigerant in the air conditioner 1000 leaks, the compressor 20 of the air conditioner 1000 continues to operate. Therefore, the temperature value TT5 of the first temperature sensor 70 measuring the temperature at the top of the compressor 20 can increase accordingly. However, the refrigerant leakage can cause the measured value TP5 of the second temperature sensor 80 provided at the exhaust port of the compressor 20 to be lower, resulting in a significant temperature difference between the measured temperatures of the two temperature sensors. When the air conditioner 1000 determines that the air conditioner 1000 meets the fourth condition but does not meet the fifth condition, it controls the compressor to continue operating for a fourth preset time period (as shown in “S7”) to avoid the air conditioner not reaching a stable state. After that, the temperature value TT6 of the first temperature sensor 70, the temperature value TP6 of the second temperature sensor 80, and the difference TT6 - TP6 between the two are obtained (as shown in “S8”), and it is determined whether the air conditioner 1000 meets the fourth condition and the fifth condition (as shown in “S9” and “S11”). When the controller 90 determines that the temperature value TT6 of the first temperature sensor 70 is not greater than the third preset temperature value (as Figure 7 “Yes” in “S9” in [reference]), but the difference between the temperature value TT6 of the first temperature sensor 70 and the temperature value TP6 of the second temperature sensor 80 is greater than the fifth preset temperature difference value (as Figure 7When it is “No” in “S11” therein, the controller increases the opening degree of the expansion valve 30. For example, the controller adjusts the opening degree of the expansion valve 30 to the maximum. After the opening degree of the expansion valve 30 increases (for example, the opening degree is adjusted to the maximum), the controller 90 controls the air conditioner 1000 to continue operating for a third time period (for example, 5 minutes, but not limited thereto) (as shown in Figure 7 “S13” therein), and when the third time period expires, it is determined again whether the air conditioner 1000 satisfies the fourth condition and the fifth condition (as shown in “S15” and “S17”). This is to avoid acquisition errors in the temperatures of the first temperature sensor 70 and the second temperature sensor 80 caused by too high indoor temperature and / or indoor humidity. If the controller 90 determines this time that the air conditioner 1000 satisfies the fourth condition (such as Figure 7 “Yes” in “S15” therein), but does not satisfy the fifth condition (such as Figure 7 “No” in “S17” therein), it indicates that there is a refrigerant leak inside the air conditioner 1000, and the controller 90 can control the compressor 20 to stop operating and report the refrigerant leak fault (as shown in “S18”); or, if the controller 90 determines this time that the air conditioner 1000 does not satisfy the fourth condition (such as Figure 7 “No” in “S15” therein), it indicates that the temperature of the compressor 20 is too high. To ensure the safety of the compressor 20, the controller 90 controls the compressor 20 to stop operating and report the refrigerant leak fault (as shown in “S16”); or, if the controller 90 determines this time that the air conditioner 1000 satisfies the fourth condition (such as Figure 7 “Yes” in “S15” therein) and the fifth condition (such as Figure 7 “Yes” in “S17” therein), it indicates that there is no refrigerant leak in the air conditioner 1000, and the controller 90 can determine that there is no refrigerant leak in the air conditioner 1000 and exit the operation of determining whether there is a refrigerant leak in the air conditioner 1000 (as shown in “S19”).

[0091] According to some embodiments of the present invention, the above operations of determining whether the first cut-off valve 101 and the second cut-off valve 102 are opened and the above operations of determining whether there is a refrigerant leak in the air conditioner 1000 are performed in sequence. In other words, the above operations of determining whether the first cut-off valve 101 and the second cut-off valve 102 are opened are performed prior to the above operations of determining whether there is a refrigerant leak in the air conditioner 1000.

[0092] Further, the controller 90 is configured to:

[0093] When the operation of controlling the exhaust of the compressor 20 conflicts with the operation of determining whether the first cut-off valve 101 and the second cut-off valve 102 are open, continue the operation of determining whether the first cut-off valve 101 and the second cut-off valve 102 are open, temporarily interrupt the operation of controlling the exhaust of the compressor 20, and after the conflict disappears, restart the operation of adjusting the opening time of the expansion valve 30 according to the difference between the temperature value of the first temperature sensor 70 and the temperature value of the second temperature sensor 80; or

[0094] When the operation of controlling the exhaust of the compressor 20 conflicts with the operation of determining whether the air conditioner 1000 has refrigerant leakage, continue the above operation of determining whether the air conditioner 1000 has refrigerant leakage, temporarily interrupt the operation of controlling the exhaust of the compressor 20, and after the conflict disappears, restart the operation of adjusting the opening time of the expansion valve 30 according to the difference between the temperature value of the first temperature sensor 70 and the temperature value of the second temperature sensor 80.

[0095] For example, the operation of the controller 90 for controlling the exhaust of the compressor 20 includes controlling the opening time of the expansion valve 30, that is, adjusting the opening of the expansion valve 30 at a certain adjustment time; the operation of the controller 90 for determining whether the first cut-off valve 101 and the second cut-off valve 102 are open includes increasing the opening of the expansion valve 30. It can be seen that both of these operations performed by the controller 90 involve adjusting the opening of the expansion valve 30, and may involve different adjustments to the opening of the expansion valve 30. At this time, these two operations conflict. In this case, the controller 90 continues to perform the operation of determining whether the first cut-off valve 101 and the second cut-off valve 102 are open, temporarily interrupts the operation of controlling the exhaust of the compressor 20, and after the conflict disappears, if the controller 90 has adjusted the opening of the expansion valve 30 according to the operation of determining whether the first cut-off valve 101 and the second cut-off valve 102 are open, the controller 90 re-obtains the temperature of the first temperature sensor 70 and the temperature of the second temperature sensor 80 and restarts the operation of adjusting the opening time of the expansion valve 30 according to the difference between the temperature value of the first temperature sensor 70 and the temperature value of the second temperature sensor 80 to adjust the opening of the expansion valve 30.

[0096] For another example, the exhaust control operation of the compressor 20 performed by the controller 90 includes controlling the adjustment time of the opening degree of the expansion valve 30, that is, adjusting the opening degree of the expansion valve 30 at a certain adjustment time; the operation of the controller 90 for determining whether the air conditioner 1000 has a refrigerant leak includes increasing the opening degree of the expansion valve 30. It can be seen that both of these operations performed by the controller 90 involve adjusting the opening degree of the expansion valve 30, and may involve different adjustments to the opening degree of the expansion valve 30. At this time, these two operations conflict. In this case, the controller 90 continues to perform the operation of determining whether the air conditioner 1000 has a refrigerant leak, temporarily interrupts the exhaust control operation of the compressor 20, and after the conflict disappears, if the controller 90 has adjusted the opening degree of the expansion valve 30 according to the operation of determining whether the air conditioner 1000 has a refrigerant leak, then the controller 90 re-obtains the temperature of the first temperature sensor 70 and the temperature of the second temperature sensor 80 and re-performs the operation of controlling the adjustment time of the opening degree of the expansion valve 30 according to the difference between the temperature values of the first temperature sensor 70 and the second temperature sensor 80 to adjust the opening degree of the expansion valve 30.

[0097] According to some embodiments of the present invention, the temperature probe of the first temperature sensor 70 is a steel part, and the temperature probe of the second temperature sensor 80 is a copper part. Of course, the present invention is not limited thereto.

[0098] The other configurations and operations of the air conditioner 1000 according to the embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail here.

[0099] The above technical description can be referred to the accompanying drawings, which form a part of the present invention, and the embodiments in accordance with the described embodiments are shown by the description in the drawings. Although these embodiments are described in sufficient detail to enable those skilled in the art to implement these embodiments, these embodiments are non-limiting; thus, other embodiments can be used, and changes can be made without departing from the scope of the described embodiments. For example, the order of operations described in the flowcharts is non-limiting, so the order of two or more operations illustrated and described according to the flowcharts can be changed according to several embodiments. As another example, in several embodiments, one or more operations illustrated and described according to the flowcharts are optional or can be deleted. Additionally, certain steps or functions can be added to the disclosed embodiments, or the order of two or more steps can be permuted. All these changes are considered to be included in the disclosed embodiments and the claims.

[0100] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0101] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An air conditioner, characterized in that, Comprising: A refrigerant circulation circuit that circulates refrigerant in a circuit composed of a compressor, a condenser, an expansion valve, an evaporator, and a four-way valve; A compressor for compressing low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharging it to the condenser; An outdoor heat exchanger and an indoor heat exchanger, where one operates as a condenser and the other operates as an evaporator; A four-way valve for controlling the refrigerant flow direction in the refrigerant circulation circuit to enable the outdoor heat exchanger and the indoor heat exchanger to switch between operating as a condenser and an evaporator; A first temperature sensor for detecting the temperature at the top of the compressor; A second temperature sensor for detecting the temperature at the exhaust port of the compressor; A controller configured to perform exhaust control operations on the compressor, including: after controlling the expansion valve to operate at a fixed opening for a first preset time period, controlling the adjustment time of the opening of the expansion valve according to the difference between the temperature value of the first temperature sensor and the temperature value of the second temperature sensor, so that the temperature value of the first temperature sensor or the temperature value of the second temperature sensor is equal to or approximately equal to the target exhaust temperature of the compressor.

2. The air conditioner according to claim 1, wherein, The controller is specifically configured as: If the absolute value of the difference between the temperature value of the first temperature sensor and the temperature value of the second temperature sensor is equal to or lower than a first preset temperature difference value, then adjust the opening of the expansion valve at a first time interval according to the difference between the temperature value of the second temperature sensor and the target exhaust temperature, so that the temperature value of the second temperature sensor is equal to or approximately equal to the target exhaust temperature of the compressor; If the absolute value is between the first preset temperature difference value and a second preset temperature difference value, then adjust the opening of the expansion valve at a second time interval according to the difference between the average value of the temperature value of the first temperature sensor and the temperature value of the second temperature sensor and the target exhaust temperature, so that the temperature value of the first temperature sensor is equal to or approximately equal to the target exhaust temperature of the compressor, where the second preset temperature difference value is greater than the first preset temperature difference value; If the absolute value is higher than or equal to the second preset temperature difference value, then adjust the opening of the expansion valve at a third time interval according to the difference between the temperature value of the first temperature sensor and the target exhaust temperature, so that the temperature value of the first temperature sensor is equal to or approximately the target exhaust temperature of the compressor.

3. The air conditioner according to claim 2, wherein, The second time interval is 1.5 times the first time interval, and the third time interval is 2 times the first time interval.

4. The air conditioner according to claim 1, characterized in that, The controller is specifically configured as: After controlling the expansion valve to operate at a fixed opening for the first preset time period, first determine whether the temperature value of the first temperature sensor is greater than a first preset temperature value; If the judgment result is no, then control the adjustment time of the opening of the expansion valve according to the absolute value of the difference between the temperature value of the first temperature sensor and the temperature value of the second temperature sensor; If the judgment result is yes, then control the compressor to stop running and report a refrigerant leakage fault.

5. The air conditioner according to any one of claims 1 to 4, characterized in that Further comprising: The first shut-off valve, the first shut-off valve being connected between the four-way valve and one end of the indoor heat exchanger; The second shut-off valve, the second shut-off valve being connected between the other end of the indoor heat exchanger and the expansion valve; The controller is further configured to, after controlling the air conditioner to operate for a second preset time period, determine whether the first shut-off valve and the second shut-off valve are open according to the temperature value of the first temperature sensor and the difference between the temperature value of the first temperature sensor and the temperature value of the second temperature sensor.

6. The air conditioner according to claim 5, characterized in that, The controller is specifically configured to perform the following operations to determine whether the first shut-off valve and the second shut-off valve are open: Determine whether the air conditioner satisfies a first condition and a second condition, wherein the first condition is that the temperature value of the first temperature sensor is lower than or equal to a second preset temperature value, and the second condition is that the difference between the temperature value of the first temperature sensor and the temperature value of the second temperature sensor is lower than or equal to a third preset temperature difference value; If the air conditioner satisfies the first condition and does not satisfy the second condition, control the opening degree of the expansion valve to increase; After the air conditioner operates for a first time period with the opening degree of the expansion valve increased, determine whether the air conditioner satisfies the first condition, the second condition, and a third condition, wherein the third condition is that the difference between the temperature value of the first temperature sensor and the temperature value of the second temperature sensor is lower than or equal to a fourth preset temperature difference value, and the fourth preset temperature difference value is greater than the third preset temperature difference value; If the air conditioner does not satisfy the first condition and / or the third condition, control the compressor to stop operating and report a system fault.

7. The air conditioner according to claim 6, characterized in that, The controller is also specifically configured to perform the following operations to determine whether the first shut-off valve and the second shut-off valve are open: If the air conditioner satisfies the first condition, the second condition, and the third condition, determine that both the first shut-off valve and the second shut-off valve have been opened and exit the operation of determining whether the first shut-off valve and the second shut-off valve are open; If the air conditioner satisfies the first condition and the third condition and does not satisfy the second condition, control the compressor to continue operating for a second time period and, after the second time period, obtain the temperature value of the first temperature sensor, the temperature value of the second temperature sensor, and the difference therebetween, and determine whether the air conditioner satisfies the first condition and the second condition; If the air conditioner does not satisfy the first condition, or satisfies the first condition but does not satisfy the second condition, control the compressor to stop operating and report a system fault; If the air conditioner satisfies the first condition and the second condition, determine that both the first shut-off valve and the second shut-off valve have been opened and exit the operation of determining whether the first shut-off valve and the second shut-off valve are open.

8. The air conditioner according to claim 5, characterized in that, The controller is further configured to perform an operation of determining whether the air conditioner has refrigerant leakage, including: After controlling the compressor to continuously operate for a third preset time period, obtain the temperature values of the first temperature sensor and the second temperature sensor, record the difference between the two, and determine whether the air conditioner satisfies a fourth condition and a fifth condition. The fourth condition is that the temperature value of the first temperature sensor is not greater than a third preset temperature value, and the fifth condition is that the difference between the temperature values of the first temperature sensor and the second temperature sensor is not greater than a fifth preset temperature difference value; If the air conditioner satisfies the fourth condition and does not satisfy the fifth condition, control the compressor to continue operating for a fourth preset time period, and after the fourth preset time period, obtain the temperature values of the first temperature sensor and the second temperature sensor, record the difference between the two, and determine whether the air conditioner satisfies the fourth condition and the fifth condition; If the air conditioner satisfies the fourth condition and does not satisfy the fifth condition, control the opening degree of the expansion valve to increase. After the air conditioner operates for a third time period with the increased opening degree of the expansion valve, determine whether the air conditioner satisfies the fourth condition and the fifth condition; If the air conditioner satisfies the fourth condition but does not satisfy the fifth condition, control the compressor to stop operating and report a refrigerant leakage fault; If the air conditioner does not satisfy the fourth condition, control the compressor to stop operating and report a refrigerant leakage fault; If the air conditioner satisfies the fourth condition and the fifth condition, determine that the air conditioner has not had a refrigerant leakage and exit the operation of determining whether the air conditioner has had a refrigerant leakage.

9. The air conditioner according to claim 8, wherein, The controller is configured to: sequentially perform the operations of determining whether the first cut-off valve and the second cut-off valve are opened and the operation of determining whether the air conditioner has had a refrigerant leakage; and When there is a conflict between the exhaust control operation of the compressor and the operation of determining whether the first cut-off valve and the second cut-off valve are opened, continue to perform the operation of determining whether the first cut-off valve and the second cut-off valve are opened, temporarily interrupt the exhaust control operation of the compressor, and after the conflict disappears, re-perform the operation of adjusting the opening degree of the expansion valve according to the difference between the temperature values of the first temperature sensor and the second temperature sensor; or When there is a conflict between the exhaust control operation of the compressor and the operation of determining whether the air conditioner has had a refrigerant leakage, continue to perform the operation of determining whether the air conditioner has had a refrigerant leakage, temporarily interrupt the exhaust control operation of the compressor, and after the conflict disappears, re-perform the operation of adjusting the opening degree of the expansion valve according to the difference between the temperature values of the first temperature sensor and the second temperature sensor.

10. The air conditioner according to any one of claims 1-4, characterized in that, The temperature probe of the first temperature sensor is a steel part, and the temperature probe of the second temperature sensor is a copper part.

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