Air conditioner and control method thereof

Abstract

The embodiment of the application provides an air conditioner and a control method thereof, and relates to the technical field of air conditioners. The gas-liquid separator comprises a shell and a float switch, the float switch is installed inside the shell, the resistance value of the float switch changes with the change of the liquid level height in the shell, so as to reflect the liquid level height in the shell, when the liquid level height reaches a degree with a risk of liquid return, the air conditioner can be controlled in time to return the liquid, the function of liquid return protection is played, and the service life of the compressor is prolonged.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to an air conditioner and its control method. Background Technology

[0002] When air conditioning units operate in low-temperature cooling or heating conditions, poor heat exchange between the refrigerant and the outside air can lead to incomplete refrigerant evaporation. This can easily cause liquid refrigerant to be drawn into the compressor's suction port through the return pipe, resulting in liquid compression of the compressor and affecting its lifespan. This situation is even worse when there are long piping and a lot of refrigerant added. Currently, a gas-liquid separator is usually added at the front end of the compressor's return pipe to store some liquid refrigerant and prevent liquid return from the compressor.

[0003] However, current gas-liquid separators on the market do not have the function of pre-identifying, adjusting and controlling liquid return. When the liquid level reaches a certain height, liquid return will also occur, reducing the service life of the compressor. Summary of the Invention

[0004] The problem solved by this invention is that existing gas-liquid separators do not have the function of pre-identifying, regulating and controlling liquid return. When the liquid level is at a certain height, liquid return will also occur, reducing the service life of the compressor.

[0005] To address the above problems, in a first aspect, the present invention provides a gas-liquid separator, the gas-liquid separator comprising:

[0006] case;

[0007] The float switch is installed inside the housing. The resistance value of the float switch changes with the liquid level inside the housing to reflect the liquid level inside the housing.

[0008] The beneficial effects of the gas-liquid separator provided in this embodiment include:

[0009] By adding a float switch to the gas-liquid separator, the resistance value of the float switch changes with the liquid level in the housing, thus reflecting the liquid level. When the liquid level reaches a level that poses a risk of liquid return, the air conditioner can be promptly controlled to prevent liquid return, thereby protecting it from liquid return and extending the compressor's service life.

[0010] In an optional implementation, the float switch includes:

[0011] The strip resistor is vertically mounted inside the housing, with one end of the strip resistor used for electrical connection to the control board;

[0012] A buoy, which is slidably mounted on a strip resistor, is used to suspend itself on the liquid surface and to be electrically connected to the control board.

[0013] The strip resistor and the float together constitute the sliding rheostat.

[0014] In this way, the structure of the float switch is simple. The float is suspended on the liquid surface. The resistance value of the strip resistor connected to the circuit is different depending on the height of the liquid surface, which can accurately reflect the height of the liquid surface.

[0015] In an optional embodiment, the gas-liquid separator further includes:

[0016] The outlet pipe has one end located inside the shell and the other end extending out from inside the shell.

[0017] The bottom of the strip resistor is lower than the inlet of the outlet tube, while the top of the strip resistor is not lower than the inlet of the outlet tube.

[0018] Because when the liquid level in the gas-liquid separator reaches the inlet of the outlet pipe, liquid will enter the inlet of the outlet pipe, causing liquid backflow. Therefore, it is necessary to monitor the liquid level before it reaches the inlet of the outlet pipe. By setting the bottom of the bar resistor below the inlet of the outlet pipe and the top of the bar resistor not below the inlet of the outlet pipe, the height of the liquid level when it is about to reach the inlet of the outlet pipe can be monitored. When there is a risk of liquid backflow, timely liquid backflow control can be implemented.

[0019] Secondly, the present invention provides an air conditioner, which includes the gas-liquid separator of the aforementioned embodiments.

[0020] In an optional implementation, the air conditioner further includes:

[0021] The control board is electrically connected to the float switch;

[0022] The float switch is used to input a constant current value, and the control board is used to adjust the current based on the real-time voltage value U of the float switch. 实时 Determine whether to perform return liquid control.

[0023] Thirdly, the present invention provides a control method for an air conditioner, the air conditioner including the gas-liquid separator of the aforementioned embodiments, the control method for the air conditioner including:

[0024] A float switch is used to input a constant current value;

[0025] Based on the real-time voltage value U of the float switch 实时 Determine whether to perform return liquid control.

[0026] The beneficial effects of the air conditioner and its control method provided in this embodiment include:

[0027] By adding a float switch to the gas-liquid separator and electrically connecting the control board to the float switch, after a constant current value is input to the float switch, the control board receives the real-time voltage value U of the float switch.实时 It can reflect the liquid level in the gas-liquid separator. When the liquid level reaches a level that poses a risk of liquid return, it can promptly control the liquid return of the air conditioner, thus playing a role in liquid return protection and extending the service life of the compressor.

[0028] In an optional implementation, based on the real-time voltage value U of the float switch 实时 The steps to determine whether to perform return fluid control include:

[0029] in U 实时 If the value is less than U2, it is determined that no liquid return control will be performed;

[0030] in U 实时 If U2 is ≥2, then liquid return control is required;

[0031] Where U2 is the critical voltage value, in U 实时 In the case of U2, there is no risk of liquid backflow in the liquid level H of the gas-liquid separator. H and U... 实时 They are inversely proportional.

[0032] In an optional implementation, in U 实时 In the case of <U2, after determining that no liquid return control should be performed, the control method of the air conditioner includes:

[0033] To ensure the compressor operates normally, the real-time valve step P of the electronic expansion valve is controlled based on the first return gas superheat T1. 实时 ;

[0034] Where T1=T 回气 -T 换热器 -S0,T 回气 T is the return gas temperature. 换热器 S0 represents the temperature of the heat exchanger and is the first superheat correction value.

[0035] At this point, there is no risk of liquid backflow in the air conditioner, so the entire unit is kept under normal control to meet the customer's comfort needs.

[0036] In an optional implementation, in U 实时 When U2 is ≥2, after determining the step of performing liquid return control, the control method of the air conditioner includes:

[0037] In U1≥U 实时 Under conditions ≥U2, the compressor is controlled to operate normally, and the real-time valve step P of the electronic expansion valve is controlled according to the second return gas superheat T2. 实时 ;

[0038] Where U1 is the first preset voltage value, in U 实时 When T = U1, there is a risk of liquid backflow in the liquid level H of the gas-liquid separator, and T2 = T. 回气 -T换热器 -S0-S2, where S2 is the second superheat correction value.

[0039] At this point, there is a slight risk of liquid return. It is necessary to appropriately increase the superheat of the return gas, which can effectively increase the content of gaseous refrigerant in the return gas. This will slow down the accumulation of liquid refrigerant in the gas-liquid separator, thereby reducing the risk of liquid return and ensuring the reliability of liquid return. Specifically, increasing the superheat of the return gas is achieved by reducing the valve step of the electronic expansion valve, which can reduce the flow rate of the refrigerant. This allows the refrigerant entering the heat exchanger to receive better heat exchange, and more liquid refrigerant evaporates into gas, effectively increasing the content of gaseous refrigerant in the return gas.

[0040] In an optional implementation, in U 实时 When U2 is ≥2, after determining the step of performing liquid return control, the control method of the air conditioner includes:

[0041] In U0≥U 实时 Under conditions >U1, the compressor is controlled to operate normally, and the real-time valve step P of the electronic expansion valve is controlled according to the third return gas superheat T3. 实时 ;

[0042] Where U0 is the limiting voltage value, and T3 = T 回气 -T 换热器 -S0-S1, where S1 is the third superheat correction value.

[0043] At this point, there is a serious risk of liquid return, and it is necessary to quickly increase the superheat of the return gas and the amount of gaseous refrigerant entering the gas-liquid separator to ensure the reliability of liquid return.

[0044] In an optional implementation, in U 实时 When U2 is ≥2, after determining the step of performing liquid return control, the control method of the air conditioner includes:

[0045] in U 实时 When the value is greater than U0, the compressor is stopped, and the real-time valve step P of the electronic expansion valve is adjusted. 实时 Maintain the current opening for the preset duration, then adjust to the first opening P1, where P1 > 0.

[0046] In an optional implementation, the value range of the first opening P1 is 3pls to 7pls, and the value range of the preset duration is 100s to 140s.

[0047] Here, the real-time valve step P of the electronic expansion valve... 实时Maintaining the current opening for the preset duration is to ensure rapid pressure balance after system shutdown. After pressure balance, the electronic expansion valve opening is adjusted to the first opening P1 to avoid excessive reset during electronic expansion valve reset. Theoretically, it should be reset to 0pls, but this is easy to damage the internal mechanical structure. To avoid the electronic expansion valve getting stuck after reset, it is only reduced to the first opening P1.

[0048] In an optional implementation, 4℃≥S0≥0, 5℃≥S1≥3℃, and 2℃≥S2≥1℃.

[0049] In an optional implementation, in cooling mode, T 换热器 =T 内盘 T 内盘 This refers to the temperature of the evaporator's inner plate; in heating mode, T... 换热器 =T 除霜 T 除霜 This is the defrosting temperature of the condenser. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of the gas-liquid separator provided in the first embodiment of the present invention;

[0051] Figure 2 This is a schematic diagram of the structure of an air conditioner provided in the second embodiment of the present invention;

[0052] Figure 3 A flowchart of an air conditioner control method provided in the second embodiment of the present invention.

[0053] Explanation of reference numerals in the attached figures:

[0054] 1-Gas-liquid separator; 11-Shell; 12-Outlet pipe; 13-Inlet pipe; 14-Float switch; 141-Bar resistor; 142-Float; 2-Air conditioner; 21-Compressor; 22-Four-way valve; 23-Evaporator; 24-Condenser; 25-Electronic expansion valve; 26-Return gas temperature sensor; 27-Inner plate temperature sensor; 28-Defrost temperature sensor. Detailed Implementation

[0055] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0056] First Embodiment

[0057] Please see Figure 1 This embodiment provides a gas-liquid separator 1, which includes a housing 11, an outlet pipe 12, an inlet pipe 13, and a float switch 14.

[0058] One end of the outlet pipe 12 is located inside the housing 11, and the other end of the outlet pipe 12 extends out from inside the housing 11. The inlet pipe 13 is inserted into the housing 11 from the outside.

[0059] The float switch 14 is installed inside the housing 11. The resistance value of the float switch 14 changes with the liquid level in the housing 11 to reflect the liquid level. When the liquid level reaches a level that poses a risk of liquid return, it can promptly control the liquid return of the air conditioner 2, thus providing liquid return protection and improving the performance of the compressor 21. Figure 2 The service life is shown in the figure.

[0060] Specifically, the float switch 14 is a sliding rheostat, comprising a strip resistor 141 and a float 142. The strip resistor 141 is vertically mounted inside the housing 11, with one end electrically connected to the control board. The float 142 is slidably mounted on the strip resistor 141, suspending itself on the liquid surface, and is also electrically connected to the control board. This design simplifies the structure of the float switch 14. With the float 142 suspended on the liquid surface, the resistance value of the strip resistor 141 varies depending on the liquid level, accurately reflecting the liquid level.

[0061] The bottom of the strip resistor 141 is lower than the inlet of the outlet pipe 12, while the top of the strip resistor 141 is not lower than the inlet of the outlet pipe 12. Because when the liquid level in the gas-liquid separator 1 reaches the inlet of the outlet pipe 12, liquid will enter the inlet of the outlet pipe 12, causing backflow, monitoring is required before the liquid level reaches the inlet of the outlet pipe 12. By ensuring that the bottom of the strip resistor 141 is lower than the inlet of the outlet pipe 12 and the top of the strip resistor 141 is not lower than the inlet of the outlet pipe 12, the liquid level of the section about to reach the inlet of the outlet pipe 12 can be monitored, allowing for timely backflow control when a risk of backflow is imminent.

[0062] The beneficial effects of the gas-liquid separator 1 provided in this embodiment include:

[0063] By adding a float switch 14 to the gas-liquid separator 1, the resistance value of the float switch 14 changes with the liquid level in the housing 11 to reflect the liquid level in the housing 11. When the liquid level reaches a level that poses a risk of liquid return, the air conditioner 2 can be automatically controlled to prevent liquid return, thus playing a role in liquid return protection and extending the service life of the compressor 21.

[0064] Second Embodiment

[0065] Please see Figure 2This embodiment provides an air conditioner 2, which includes a compressor 21, a four-way valve 22, an evaporator 23, a condenser 24, an electronic expansion valve 25, an electronic control board (not shown in the figure), and a gas-liquid separator 1 provided in the first embodiment.

[0066] In this configuration, the gas-liquid separator 1, compressor 21, and four-way valve 22 are connected sequentially from beginning to end. The condenser 24, electronic expansion valve 25, evaporator 23, and four-way valve 22 are also connected sequentially from beginning to end.

[0067] Electrical control board and float switch 14 (see also) Figure 1 Electrical connection, wherein float switch 14 is used to input a constant current value, and the control board is used to adjust the current based on the real-time voltage value U of float switch 14. 实时 Determine whether to perform return liquid control.

[0068] Air conditioner 2 also includes a return air temperature sensor 26, an indoor panel temperature sensor 27, and a defrost temperature sensor 28. The return air temperature sensor 26 is installed on the pipeline between the four-way valve 22 and the gas-liquid separator 1, and is used to detect the return air temperature T. 回气 The inner plate temperature sensor 27 is installed on the inner plate of the evaporator 23. The inner plate temperature sensor 27 is used to detect the inner plate temperature T of the evaporator 23. 内盘 The defrost temperature sensor 28 is installed on the condenser 24 and is used to detect the defrost temperature T of the condenser 24. 除霜 .

[0069] Of course, air conditioner 2 also includes other conventional components, such as shut-off valves and fans, which will not be elaborated here.

[0070] Please see Figure 3 This embodiment also provides a control method for the air conditioner 2 described above. This control method can be implemented by the aforementioned electronic control board, and it is applicable to both cooling and heating modes. The control method includes the following steps:

[0071] S1: Used to input a constant current value for float switch 14.

[0072] S2: Calculate the real-time voltage value U of float switch 14 实时 .

[0073] In calculating the real-time voltage value U 实时 Previously, compressor 21 could be controlled to run for a first duration, which is the time required from startup to stable operation of compressor 21. This process is unstable, so no liquid return protection control is performed to avoid misjudgment. The first duration is longer than 3 minutes.

[0074] Real-time voltage value U 实时The real-time voltage value U is equal to the product of the constant current value and the resistance value of the float switch 14. 实时 It is directly proportional to the resistance value of float switch 14.

[0075] S3: Determine if U 实时 <U2.

[0076] in U 实时 In the case of <U2, if there is no risk of liquid return in air conditioner 2, then the entire unit will maintain normal control to meet the customer's comfort needs. Therefore, it is determined that liquid return control will not be performed, and S4 will be executed: control compressor 21 to operate normally, and control the real-time valve step P of electronic expansion valve 25 according to the first return gas superheat T1. 实时 Where T1=T 回气 -T 换热器 -S0,T 回气 T is the return gas temperature. 换热器 The temperature of the heat exchanger is given by S0, where S0 is the first superheat correction value. 4℃ ≥ S0 ≥ 0, 500pls ≥ P. 实时 ≥0.

[0077] in U 实时 In the case of ≥U2, where U2 is the critical voltage value, U 实时 In the case of U2, there is no risk of liquid backflow in the liquid level H of the gas-liquid separator 1, and H is related to U. 实时 The relationship is inversely proportional. If the liquid level continues to rise, it will slightly exacerbate the backflow phenomenon. Therefore, backflow control is initiated, and step S5 is executed: determine if U1 ≥ U. 实时 Wherein, U1 is the first preset voltage value, and U... 实时 In the case of U1, there is a risk of liquid backflow in the liquid height H of the gas-liquid separator 1. U1 is the real-time voltage across the sliding rheostat corresponding to the larger value when the two floats 142 are at the liquid surface during the liquid backflow test of each unit under low temperature refrigeration and low temperature heating conditions. It represents the voltage value corresponding to the worst liquid level height in the system during the overall design of the unit. It varies between different units and is a constant value.

[0078] In U1≥U 实时 When U2 is ≥2, execute S6: control the compressor 21 to operate normally, and control the real-time valve step P of the electronic expansion valve 25 according to the second return gas superheat T2. 实时 Where, T2=T 回气 -T 换热器-S0-S2, where S2 is the second superheat correction value, 2℃≥S2≥1℃. At this point, there is a slight risk of liquid return, requiring an appropriate increase in the return gas superheat. This effectively increases the content of gaseous refrigerant in the return gas, thus mitigating the accumulation of liquid refrigerant in the gas-liquid separator 1, thereby reducing the risk of liquid return and ensuring its reliability. The increase in return gas superheat is achieved by reducing the valve step of the electronic expansion valve 25, which reduces the refrigerant flow rate, allowing for better heat exchange of the refrigerant entering the heat exchanger. More liquid refrigerant evaporates into gas, effectively increasing the content of gaseous refrigerant in the return gas.

[0079] In low-temperature refrigeration mode, only a portion of the liquid refrigerant absorbs heat from the air and evaporates into gaseous refrigerant as it passes through evaporator 23. The remaining refrigerant remains in an incompletely evaporated liquid state. Increasing the superheat of the return gas effectively increases the content of gaseous refrigerant in the return gas, thus mitigating the accumulation of liquid refrigerant in the gas-liquid separator 1 and reducing the risk of liquid return. Similarly, in low-temperature heating mode, the state in condenser 24 is the same as that in evaporator 23 during refrigeration.

[0080] The increase in return gas superheat is achieved by reducing the valve step of the electronic expansion valve 25 in the outdoor unit, which reduces the refrigerant flow rate. This allows the refrigerant entering the evaporator 23 to receive better heat exchange, and more liquid refrigerant to evaporate into gaseous state, effectively increasing the content of gaseous refrigerant in the return gas.

[0081] in U 实时 If U0 > U1, execute S7: determine if U0 ≥ U1. 实时 Wherein, U0 is the limiting voltage value, and U0 is a constant value, which is determined according to the size of the gas-liquid separator 1.

[0082] In U0≥U 实时 In cases where the value is greater than U1, there is a serious risk of liquid return. It is necessary to rapidly increase the return gas superheat and the amount of gaseous refrigerant entering the gas-liquid separator 1 to ensure reliable liquid return. Therefore, S8 is executed: The compressor 21 is controlled to operate normally, and the real-time valve step P of the electronic expansion valve 25 is controlled according to the third return gas superheat T3. 实时 Where, T3 = T 回气 -T 换热器 -S0-S1, where S1 is the third superheat correction value, 5℃≥S1≥3℃. At this point, in order to improve the target return gas superheat, the target value of the return gas superheat is (S0+S1), thus improving the overall return gas superheat by S1.

[0083] in U 实时When the value is greater than U0, the liquid level in the gas-liquid separator 1 reaches its maximum value. At this time, the liquid level exceeds the inlet of the outlet pipe 12, and liquid return will occur. Then, S9 is executed: the compressor 21 is stopped, and the real-time valve step P of the electronic expansion valve 25 is activated. 实时 Maintain the current opening for a preset duration, then adjust to the first opening P1. Wherein, P1 > 0, preferably, the value range of the first opening P1 is 3pls~7pls, specifically 5pls, and the preset duration range is 100s~140s, preferably 120s.

[0084] Here, the real-time valve step P of the electronic expansion valve 25 实时 Maintaining the current opening for the preset duration is to ensure rapid pressure balance after system shutdown. After pressure balance, the opening of the electronic expansion valve 25 is adjusted to the first opening P1 to avoid over-reset when the electronic expansion valve 25 resets. Theoretically, it should reset to 0pls, but this is easy to damage the internal mechanical structure. In order to avoid the electronic expansion valve 25 getting stuck after reset, it is only reduced to the first opening P1.

[0085] In cooling mode, T 换热器 =T 内盘 T 内盘 The temperature of the inner plate of evaporator 23; in heating mode, T 换热器 =T 除霜 T 除霜 This is the defrosting temperature of condenser 24.

[0086] The beneficial effects of the air conditioner 2 and its control method provided in this embodiment include:

[0087] 1. By adding a float switch 14 to the gas-liquid separator 1 and electrically connecting the control board to the float switch 14, after a constant current value is input to the float switch 14, the control board receives the real-time voltage value U of the float switch 14. 实时 It can reflect the liquid level in the gas-liquid separator 1. When the liquid level reaches a level that poses a risk of liquid return, it can automatically control the liquid return of the air conditioner 2 in a timely manner, thereby playing a role in liquid return protection and extending the service life of the compressor 21.

[0088] 2. It can effectively monitor and protect the liquid level in the gas-liquid separator 1. By controlling the electronic expansion valve 25, it can achieve zoned control of the return gas superheat, and make automatic identification and adjustment. The solution is low-cost, simple and accurate in control, and plays a role in protecting the return liquid of the air conditioner 2.

[0089] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A control method for an air conditioner, applied to an air conditioner, characterized in that, The air conditioner includes a gas-liquid separator, which comprises: Shell (11); A float switch (14) is installed inside the housing (11), the float switch (14) comprising: A strip resistor (141) is vertically mounted inside the housing (11), one end of which is electrically connected to the control board; and A buoy (142) is slidably mounted on the strip resistor (141), the buoy (142) is used to suspend on the liquid surface, and the buoy (142) is used to be electrically connected to the control board; The strip resistor (141) and the float (142) constitute a sliding rheostat. The resistance value of the sliding rheostat changes with the liquid level in the housing (11) to reflect the liquid level in the housing (11). The control method for the air conditioner includes: The float switch (14) is used to input a constant current value; According to the real-time voltage value U of the float switch (14) 实时 Determine whether to implement liquid return control; The real-time voltage value U based on the float switch (14) 实时 The steps to determine whether to perform return fluid control include: in U 实时 If the value is less than U2, it is determined that no liquid return control will be performed; in U 实时 If U2 is ≥2, then liquid return control is required; Where U2 is the critical voltage value, in U 实时 In the case of U2, the liquid level H in the gas-liquid separator has no risk of backflow, and H and U 实时 They are inversely proportional; The above in U 实时 In the case of <U2, after determining that no liquid return control should be performed, the control method of the air conditioner includes: To control the normal operation of the compressor (21), the real-time valve step P of the electronic expansion valve (25) is controlled according to the first return gas superheat T1. 实时 ; Where T1=T 回气 -T 换热器 -S0,T 回气 T is the return gas temperature. 换热器 S0 represents the temperature of the heat exchanger and is the first superheat correction value. The above in U 实时 In the case of ≥U2, after determining the step of performing liquid return control, the control method of the air conditioner includes: In U1≥U 实时 Under the condition of ≥U2, the compressor (21) is controlled to operate normally, and the real-time valve step P of the electronic expansion valve (25) is controlled according to the second return gas superheat T2. 实时 ; Where U1 is the first preset voltage value, in U 实时 In the case of =U1, there is a risk of liquid backflow in the liquid level H of the gas-liquid separator, and T2=T 回气 -T 换热器 -S0-S2, where S2 is the second superheat correction value; The above in U 实时 In the case of ≥U2, after determining the step of performing liquid return control, the control method of the air conditioner includes: In U0≥U 实时 In the case of >U1, the compressor (21) is controlled to operate normally, and the real-time valve step P of the electronic expansion valve (25) is controlled according to the third return gas superheat T3. 实时 ; Where U0 is the limiting voltage value, and T3 = T 回气 -T 换热器 -S0-S1, where S1 is the third superheat correction value; The above in U 实时 In the case of ≥U2, after determining the step of performing liquid return control, the control method of the air conditioner includes: in U 实时 When U0 > 0, the compressor (21) is stopped, and the real-time valve step P of the electronic expansion valve (25) is adjusted. 实时 Maintain the current opening for the preset duration, then adjust to the first opening P1, where P1 > 0; The value range of the first opening P1 is 3pls to 7pls, and the value range of the preset duration is 100s to 140s.

2. The control method for an air conditioner according to claim 1, characterized in that, 4℃≥S0≥0, 5℃≥S1≥3℃, 2℃≥S2≥1℃.

3. The control method for an air conditioner according to claim 2, characterized in that, In cooling mode, T 换热器 =T 内盘 T 内盘 The temperature of the inner plate of the evaporator (23); in heating mode, T 换热器 =T 除霜 T 除霜 The defrosting temperature of the condenser (24) is denoted as ...

4. The control method for an air conditioner according to claim 1, characterized in that, The gas-liquid separator also includes: An outlet pipe (12) has one end located inside the housing (11) and the other end extending out from inside the housing (11). The bottom of the strip resistor (141) is lower than the inlet of the outlet pipe (12), and the top of the strip resistor (141) is not lower than the inlet of the outlet pipe (12).

5. An air conditioner, characterized in that, The air conditioner uses the control method as described in claim 1.

Images