Gas-liquid separation device, air conditioner and control method of air conditioner

Abstract

The present application relates to air conditioner technical field, provide a kind of gas-liquid separation device, air conditioner and the control method of air conditioner, gas-liquid separation device is formed with containing cavity in shell, air inlet pipe is connected to shell, and the air outlet end of air inlet pipe is located at the first height in containing cavity;Suction pipe is connected to shell, and the air inlet end of suction pipe is located at the second height in containing cavity, there is spacing between the air inlet end of suction pipe and the air outlet end of air inlet pipe, and the first height is lower than the second height;The guide pipe of magnetic induction switch is connected to the top in containing cavity, magnetic float ball is arranged in guide pipe, magnetic induction element is arranged at the top of guide pipe, when magnetic induction element and magnetic float ball cooperate, generate liquid level signal matched with liquid level.The gas-liquid separation device can monitor the refrigerant liquid level in containing cavity in real time, then send the refrigerant liquid level to air conditioner, then according to the refrigerant liquid level operation corresponding gas-liquid separation control program, can avoid the phenomenon of liquid strike of compressor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, in particular to a gas-liquid separation device, an air conditioner and a control method of the air conditioner. BACKGROUND

[0002] During defrosting or load change, part of the liquid droplets may cause wet compression if directly entering the compressor, which may lead to deterioration of the operating condition of the compressor, so a gas-liquid separator is arranged between the outlet of the evaporator and the inlet of the compressor. In the related art, if there is too much liquid refrigerant in the gas-liquid separation device, the compressor may be subjected to liquid knock, which may cause irreparable damage to the compressor, and thus the air conditioner cannot operate, which reduces the service life of the air conditioner, and it is difficult to accurately control the operating state of the air conditioner according to the amount of liquid refrigerant in the gas-liquid separation device. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the related art. To this end, the present application provides a gas-liquid separation device, which generates a liquid level signal matched with the liquid level when the magnetic induction element cooperates with the magnetic floating ball, and the air conditioner can run a corresponding gas-liquid separation control program according to the liquid level signal, so that the compressor can be prevented from being subjected to liquid knock.

[0004] The present application also provides an air conditioner.

[0005] The present application also provides a control method of the air conditioner.

[0006] According to the gas-liquid separation device provided by the first aspect of the present application, the gas-liquid separation device comprises:

[0007] A housing, wherein a containing cavity is formed in the housing;

[0008] An air inlet pipe connected to the housing, and an air outlet end of the air inlet pipe is located at a first height in the containing cavity;

[0009] An air suction pipe connected to the housing, and an air inlet end of the air suction pipe is located at a second height in the containing cavity, the air inlet end of the air suction pipe and the air outlet end of the air inlet pipe have a spacing, and the first height is lower than the second height;

[0010] A magnetic induction switch comprising a guide pipe, a magnetic floating ball and a magnetic induction element, the guide pipe is arranged in a direction from bottom to top and connected to the top of the containing cavity, the magnetic floating ball is arranged in the guide pipe and moves along the guide pipe under the action of liquid buoyancy, the magnetic induction element is arranged at the top of the guide pipe, and the magnetic induction element generates a liquid level signal matched with the liquid level when cooperating with the magnetic floating ball.

[0011] According to one embodiment of the present application, the magnetic induction element cooperates with the magnetic floating ball to generate normal liquid level signals, warning liquid level signals and highest liquid level signals matching the liquid level when the magnetic floating ball is at the lowest position, the warning position and the highest position in the guide pipe, the highest position is lower than the second height, and the warning position has a preset safety distance from the highest position.

[0012] According to one embodiment of the present application, the heating assembly is connected to the side wall of the shell.

[0013] According to the air conditioner provided by the second aspect of the present application, at least a compressor and the gas-liquid separation device provided by the first aspect of the present application are included, and the suction port of the compressor is communicated with the suction pipe of the gas-liquid separation device.

[0014] According to one embodiment of the present application, a low-pressure sensor and a temperature sensor are arranged on the suction pipe between the suction port of the compressor and the gas-liquid separation device.

[0015] According to the control method of the air conditioner provided by the third aspect of the present application, the method includes:

[0016] In response to an air conditioner operation signal, the refrigerant liquid level in the gas-liquid separation device is obtained.

[0017] According to the refrigerant liquid level, a corresponding gas-liquid separation control program for the operation of the air conditioner is controlled, and the gas-liquid separation control program at least includes adjusting the opening degree of the electronic expansion valve.

[0018] According to one embodiment of the present application, the step of controlling the corresponding gas-liquid separation control program for the operation of the air conditioner according to the refrigerant liquid level specifically includes:

[0019] When the refrigerant liquid level is determined to be a normal liquid level, the current operation mode of the air conditioner is maintained, and the opening degree of the electronic expansion valve is adjusted to the maximum opening degree.

[0020] When the refrigerant liquid level is determined to be a warning liquid level, the refrigerant state before the suction port of the compressor is obtained, and the opening degree of the electronic expansion valve and the operation of the heating assembly are adjusted according to the refrigerant state.

[0021] When the refrigerant liquid level is determined to be a highest liquid level, the opening degree of the electronic expansion valve is closed, then the refrigerant state is obtained, and the opening degree of the electronic expansion valve and the operation of the heating assembly are adjusted according to the refrigerant state.

[0022] According to one embodiment of the present application, the step of adjusting the opening degree of the electronic expansion valve and controlling the operation of the heating assembly according to the refrigerant state specifically includes:

[0023] determining that the refrigerant state is gaseous, controlling the air conditioner to maintain the current operation mode;

[0024] determining that the refrigerant state is liquid or gaseous-liquid mixed, controlling the heating assembly to operate for a first time length, and then adjusting the opening degree of the electronic expansion valve according to the refrigerant state after heating.

[0025] According to one embodiment of the present application, the step of adjusting the opening degree of the electronic expansion valve and controlling the heating assembly to operate according to the refrigerant state specifically comprises:

[0026] determining that the refrigerant state is liquid or gaseous-liquid mixed, controlling the heating assembly to operate for a second time length, and then obtaining the refrigerant level in the gas-liquid separation device.

[0027] determining that the refrigerant level is an alarm level, adjusting the opening degree of the electronic expansion valve to a first preset opening degree, and controlling the heating assembly to continue operating for a third time length, and then adjusting the opening degree of the electronic expansion valve according to the refrigerant level after heating for the third time length.

[0028] According to one embodiment of the present application, the step of controlling the air conditioner to operate the corresponding gas-liquid separation control program according to the refrigerant level further comprises:

[0029] in response to a signal for switching the operation mode, obtaining the refrigerant level in the gas-liquid separation device;

[0030] determining that the refrigerant level is an alarm level, gradually adjusting the opening degree of the electronic expansion valve to a second preset opening degree, continuously monitoring the refrigerant level, and adjusting the opening degree of the electronic expansion valve according to the refrigerant level.

[0031] The above one or more technical solutions in the present application have at least the following technical effects:

[0032] The gas-liquid separation device provided by the embodiment of the present application comprises a shell, an air inlet pipe, an air suction pipe and a magnetic induction switch. The shell is provided with a containing cavity. The air inlet pipe is connected to the shell, and the air outlet end of the air inlet pipe is located at a first height in the containing cavity. The air suction pipe is connected to the shell, and the air inlet end of the air suction pipe is located at a second height in the containing cavity. The air inlet end of the air suction pipe is spaced apart from the air outlet end of the air inlet pipe, and the first height is lower than the second height. The magnetic induction switch comprises a guide pipe, a magnetic floating ball and a magnetic induction element. The guide pipe is arranged in a direction from bottom to top and is connected to the top of the containing cavity. The magnetic floating ball is arranged in the guide pipe and moves the guide pipe under the action of liquid buoyancy. The magnetic induction element is arranged at the top of the guide pipe, and the magnetic induction element generates a liquid level signal matched with the liquid level when cooperating with the magnetic floating ball. The gas-liquid separation device can monitor the refrigerant liquid level in the containing cavity in real time, and then send the refrigerant liquid level to the control element of the air conditioner. The air conditioner can run a corresponding gas-liquid separation control program according to the refrigerant liquid level, so as to avoid the liquid refrigerant from entering the suction port of the compressor under different refrigerant liquid levels, avoid the liquid strike phenomenon of the compressor, and reduce the damage to the compressor. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the following will briefly introduce the drawings needed to be used in the embodiments or the related art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0034] Figure 1 The schematic structural diagram of the gas-liquid separation device provided by the embodiment of the present application is shown in the figure.

[0035] Figure 2 The schematic structural diagram of the magnetic floating ball of the magnetic induction switch provided by the embodiment of the present application in different positions is shown in the figure.

[0036] Figure 3 The schematic structural diagram of the air conditioner provided by the embodiment of the present application is shown in the figure.

[0037] Figure 4 One of the flowcharts of the control method of the air conditioner provided by the embodiment of the present application is shown in the figure.

[0038] Figure 5 The second flowchart of the control method of the air conditioner provided by the embodiment of the present application is shown in the figure.

[0039] Reference signs:

[0040] 1 compressor; 2 high pressure sensor; 3 four-way valve; 4 outdoor heat exchanging unit; 5 liquid pipe stop valve; 6 indoor heat exchanging unit; 7 gas pipe stop valve; 8 gas-liquid separation device; 9 low pressure sensor; 10 suction pipe; 11 compressor exhaust port; 12 compressor suction port; 13 liquid pipe line; 14 gas pipe line; 15 intake pipe; 17 temperature sensor; 18 electronic expansion valve; 19 magnetic induction switch; 191 guide pipe; 192 magnetic floating ball; 193 magnetic induction element; 20 heating assembly. DETAILED DESCRIPTION

[0041] In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly described below with reference to the drawings in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0042] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0043] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0044] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature can be "above", "over" and "on" the second feature, which can be that the first feature is directly above or obliquely above the second feature, or only means that the first feature is higher in horizontal height than the second feature. The first feature can be "under", "below" and "under" the second feature, which can be that the first feature is directly below or obliquely below the second feature, or only means that the first feature is lower in horizontal height than the second feature.

[0045] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like 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 embodiments of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the different embodiments or examples described in the present application and the features of the different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0046] According to the gas-liquid separation device provided by the embodiments of the present application, please refer to Figures 1 to 2 , which comprises a shell, an air inlet pipe 15, an air suction pipe 10 and a magnetic induction switch 19.

[0047] Please refer to Figure 1 , the shell of the gas-liquid separation device 8 is a sealed structure, and the inner wall forms an accommodating cavity. The air inlet pipe 15 and the air suction pipe 10 are both connected to the shell. The air inlet end of the air inlet pipe 15 is located outside the shell and is used to receive the heat-exchanged refrigerant. The air outlet end of the air inlet pipe 15 is located at a first height in the accommodating cavity. The air outlet end of the air suction pipe 10 is located outside the shell, and the air inlet end of the air suction pipe 10 is located at a second height in the accommodating cavity, and the first height is lower than the second height.

[0048] The refrigerant from the indoor heat exchange unit 6 or the outdoor heat exchange unit 4 enters the accommodating cavity along the air inlet pipe 15. The liquid refrigerant falls to the bottom of the accommodating cavity under the action of gravity, and the gaseous refrigerant enters the air inlet end of the air suction pipe 10 under the action of pressure. Because the first height is lower than the second height, the liquid refrigerant will not enter the air inlet end of the air suction pipe 10.

[0049] The magnetic induction switch 19 comprises a guide pipe 191, a magnetic floating ball 192 and a magnetic induction element 193. The guide pipe 191 is connected to the top of the containing cavity and is arranged in a direction from bottom to top, i.e. can be arranged in a vertical direction or can be arranged in a direction from bottom to top in an inclined manner. The magnetic floating ball 192 is located in the guide pipe 191 and can move along the guide pipe under the action of liquid buoyancy. It should be noted that, in order to ensure that the magnetic floating ball 192 in the guide pipe 191 contacts the liquid refrigerant in the containing cavity, the bottom and the side wall of the guide pipe 191 are provided with through holes which are communicated with the inside of the guide pipe 191 and the containing cavity, so that the magnetic floating ball 192 can be contacted in the first time when the liquid level of the refrigerant rises.

[0050] The magnetic induction element 193 is arranged at the top of the guide pipe 191. The magnetic induction strength is different when the distance between the magnetic induction element 193 and the magnetic floating ball 192 is different. Therefore, when the magnetic induction element 193 cooperates with the magnetic floating ball 192, a liquid level signal matched with the liquid level is generated with the change of the liquid level of the refrigerant.

[0051] It can be understood that, with the increase of the liquid level of the refrigerant in the containing cavity, the distance between the magnetic induction element 193 and the magnetic floating ball 192 gradually decreases. At this time, the magnetic induction strength detected by the magnetic induction element 193 gradually increases. Therefore, the corresponding magnetic induction strength can reflect the change of the height of the liquid level of the refrigerant.

[0052] According to the gas-liquid separation device provided by the embodiment of the present application, the liquid level of the refrigerant in the containing cavity can be monitored in real time, and then the liquid level of the refrigerant is sent to the control element of the air conditioner. The air conditioner can run the corresponding gas-liquid separation control program according to the liquid level of the refrigerant, so that the liquid refrigerant can be avoided from entering the suction port of the compressor under different liquid levels of the refrigerant, the liquid knock phenomenon of the compressor can be avoided, and the damage to the compressor can be reduced. At the same time, the air conditioner can run the corresponding gas-liquid separation control program according to the liquid level of the refrigerant, so that the air conditioner can be avoided from being excessively adjusted, the air conditioner can be maintained in the original running state as much as possible, the original running effect can be maintained, and the use experience of the user is improved.

[0053] According to one embodiment of the present application, when the magnetic floating ball 192 is located at the lowest position, the warning position and the highest position in the guide pipe, the magnetic induction element 193 cooperates with the magnetic floating ball 192 to generate a normal liquid level signal, a warning liquid level signal and a highest liquid level signal matched with the liquid level. The control element of the air conditioner can determine the liquid level of the refrigerant in the gas-liquid separation device 8 according to the liquid level signal.

[0054] When the magnetic floating ball 192 is located at the lowest position in the guide pipe, it indicates that the amount of liquid refrigerant in the gas-liquid separation device 8 is still small, which does not affect the operation of the compressor 1 or has little effect on the operation of the compressor 1. The air conditioner can maintain the original running state and avoid excessive adjustment.

[0055] When the magnetic float ball 192 is in the warning position in the guide pipe, it indicates that the amount of liquid refrigerant in the gas-liquid separation device 8 is relatively large, and the air conditioner adjusts the gas-liquid separation control mode according to the refrigerant level, at least controls the temperature and the state of the refrigerant in the system through the electronic expansion valve 18, and reduces the amount of refrigerant in the gas-liquid separation device as much as possible, to ensure that the refrigerant entering the compressor 1 is in a gaseous state.

[0056] When the magnetic float ball 192 is in the highest position in the guide pipe, it indicates that the amount of liquid refrigerant in the gas-liquid separation device 8 is too large and is dangerous, so the electronic expansion valve 18 needs to be closed in time to avoid liquid refrigerant from entering the gas-liquid separation device 8, and to prevent the risk of liquid refrigerant entering the suction pipe 10.

[0057] It should be noted that, in order to ensure the safe operation of the compressor 1, the highest position is lower than the second height, and the highest liquid level signal is sent before the liquid refrigerant enters the suction pipe 10, and the warning position and the highest position have a preset safety distance, which can reserve a certain adjustment time for the air conditioner.

[0058] According to one embodiment of the present application, the gas-liquid separation device 8 further comprises a heating assembly 20 connected to the side wall of the shell.

[0059] Please refer to Figure 1 When the heating assembly 20 is running, the temperature of the refrigerant in the gas-liquid separation device 8 can be increased, the liquid refrigerant can be converted into gaseous refrigerant, and the wind direction of the liquid refrigerant entering the compressor 1 is reduced.

[0060] According to the air conditioner provided by the second embodiment of the present application, please refer to Figure 3 , at least comprising a compressor 1 and a gas-liquid separation device 8 according to the first embodiment of the present application, and the suction port of the compressor 1 is communicated with the suction pipe 10 of the gas-liquid separation device 8.

[0061] Please refer to Figure 3 , the air conditioner comprises a compressor 1, a four-way valve 3, an outdoor heat exchanger 4, a liquid pipe stop valve 5, an indoor heat exchanger 6, a gas pipe stop valve 7 and a gas-liquid separation device 8 connected through refrigerant pipelines, a high-pressure sensor 2 is arranged on the refrigerant pipeline between the compressor 1 and the four-way valve 3, the liquid pipe stop valve 5 is arranged on the liquid pipe 13, the gas pipe stop valve 7 is arranged on the gas pipe 14, the electronic expansion valve 18 is arranged on the inlet pipe 15, and the low-pressure sensor 9 and the temperature sensor 17 are arranged on the suction pipe 10 between the compressor 1 and the gas-liquid separation device 8.

[0062] When the air conditioner is running, the gas-liquid separation device can monitor the refrigerant level in the containing cavity in real time, and then send the refrigerant level to the control element of the air conditioner. The air conditioner can run the corresponding gas-liquid separation control program according to the refrigerant level, can avoid liquid refrigerant entering the suction port of the compressor under different refrigerant levels, can avoid the phenomenon of liquid strike of the compressor, and can reduce the damage to the compressor. At the same time, the air conditioner can run the corresponding gas-liquid separation control program according to the refrigerant level, can avoid excessive adjustment, can make the air conditioner maintain the original running state as much as possible, and then maintain the original running effect, and improve the user experience.

[0063] It should be noted that the low-pressure sensor 9 and the temperature sensor 17 are arranged on the suction pipe 10 between the suction port of the compressor 1 and the gas-liquid separation device 8.

[0064] Please refer to Figure 3 , the low-pressure sensor 9 is used to obtain the refrigerant pressure in the suction pipe 10, and the temperature sensor 17 is used to obtain the refrigerant temperature in the suction pipe 10. According to the pressure-enthalpy relationship curve of the refrigerant, the state of the refrigerant in the suction pipe 10 at any time can be determined.

[0065] According to the control method of the air conditioner provided by the third aspect of the present application, please refer to Figure 4 and Figure 5 , comprising:

[0066] S100, in response to an air conditioner running signal, obtaining the refrigerant level in the gas-liquid separation device.

[0067] S200, controlling the air conditioner to run the corresponding gas-liquid separation control program according to the refrigerant level, the gas-liquid separation control program at least including adjusting the opening degree of the electronic expansion valve.

[0068] In step S100, when the air conditioner starts running, especially when running the defrosting mode and the oil return mode, the amount of refrigerant in the gas-liquid separation device 8 will change. At this time, the magnetic induction switch 19 is used to detect the refrigerant level in the gas-liquid separation device 8.

[0069] In step S200, the gas-liquid separation device 8 can monitor the refrigerant level in the containing cavity in real time, different refrigerant levels correspond to different refrigerant level signals, and the refrigerant level signal is sent to the control element of the air conditioner. The air conditioner can run the corresponding gas-liquid separation control program according to the refrigerant level, can avoid liquid refrigerant entering the suction port of the compressor under different refrigerant levels, can avoid the phenomenon of liquid strike of the compressor, and can reduce the damage to the compressor. At the same time, the air conditioner can run the corresponding gas-liquid separation control program according to the refrigerant level, can avoid excessive adjustment, can make the air conditioner maintain the original running state as much as possible, and then maintain the original running effect, and improve the user experience.

[0070] According to one embodiment of the present application, the step of controlling the air conditioner to run the corresponding gas-liquid separation control program according to the refrigerant liquid level specifically comprises:

[0071] S210, determining that the refrigerant liquid level is a normal liquid level, then controlling the air conditioner to maintain the current running mode and adjusting the opening degree of the electronic expansion valve to the maximum opening degree.

[0072] In step S210, when the magnetic field strength of the magnetic induction switch 19 is E1, it indicates that the amount of liquid refrigerant in the gas-liquid separation device 8 is at a normal liquid level. At this time, the system does not judge the state of the refrigerant in the suction pipe, the air conditioner maintains the current running mode to avoid excessive adjustment and maintain the original running effect, and at the same time, the opening degree of the electronic expansion valve is adjusted to 100%, i.e. the maximum opening degree.

[0073] S220, determining that the refrigerant liquid level is a warning liquid level, then obtaining the refrigerant state before the suction port of the compressor and adjusting the opening degree of the electronic expansion valve and controlling the heating assembly to run according to the refrigerant state.

[0074] In step S220, when the refrigerant liquid level is a warning liquid level, the risk of inhaling liquid refrigerant in the compressor further increases. At this time, the refrigerant state in the suction pipe 10 is detected by the low-pressure sensor 9 and the temperature sensor 17. The refrigerant state includes gaseous, liquid, and gas-liquid mixed states. The refrigerant state can be determined by comparing the measured pressure and temperature with the pressure-enthalpy diagram of the refrigerant. When the refrigerant is gaseous, the risk is small. When the refrigerant is liquid or gas-liquid mixed, the amount of liquid refrigerant in the gas-liquid separation device 8 continues to increase, and the risk of liquid strike in the compressor 1 increases. Different control measures are taken when the refrigerant state is different, such as adjusting the opening degree of the electronic expansion valve 18 and controlling the heating assembly 20 to run.

[0075] According to one embodiment of the present application, the step of adjusting the opening degree of the electronic expansion valve and controlling the heating assembly to run according to the refrigerant state specifically comprises:

[0076] S221, determining that the refrigerant state is gaseous, then controlling the air conditioner to maintain the current running mode.

[0077] S222, determining that the refrigerant state is liquid or gas-liquid mixed, then controlling the heating assembly to run for a first time length, and then adjusting the opening degree of the electronic expansion valve according to the heated refrigerant state.

[0078] In steps S221 to S222, when the magnetic induction switch 19 detects a magnetic field strength E2, it indicates that the amount of liquid refrigerant in the gas-liquid separation device 8 is at an alert liquid level, and the system determines the state of the refrigerant in the suction pipe 10 according to the signals fed back by the low-pressure sensor 9 and the temperature sensor 17. If the refrigerant is determined to be in a gaseous state, the air conditioner continues to operate in the current mode until the current mode is ended; if the refrigerant is determined to be in a liquid state or a gas-liquid mixed state, the heating assembly 20 is turned on to heat the refrigerant in the gas-liquid separation device 8, and the compressor 1 continues to operate; if the heating assembly 20 operates for 30 minutes, the amount of liquid refrigerant in the gas-liquid separation device 8 is at a normal liquid level, and the opening degree of the electronic expansion valve 18 is gradually closed to 100%; if the amount of liquid refrigerant in the gas-liquid separation device 8 is at an alert liquid level, the opening degree of the electronic expansion valve 18 is gradually closed to 60%.

[0079] S230, when the refrigerant liquid level is at the highest liquid level, the opening degree of the electronic expansion valve is closed, then the state of the refrigerant is determined, and the opening degree of the electronic expansion valve and the operation of the heating assembly are adjusted according to the state of the refrigerant.

[0080] In step S230, when the refrigerant liquid level is at the highest liquid level, the risk of liquid refrigerant entering the compressor is higher, and the electronic expansion valve 18 needs to be closed immediately to avoid the liquid refrigerant in the suction pipe from further entering the gas-liquid separation device 8. After the electronic expansion valve is closed, whether the opening degree of the electronic expansion valve needs to be adjusted and the heating assembly 20 needs to heat the refrigerant in the gas-liquid separation device 8 is determined according to the state of the refrigerant in the suction pipe 10.

[0081] According to one embodiment of the present application, the step of adjusting the opening degree of the electronic expansion valve and controlling the operation of the heating assembly according to the state of the refrigerant specifically includes:

[0082] S231, when the state of the refrigerant is determined to be in a liquid state or a gas-liquid mixed state, the heating assembly is controlled to operate for a second time length, and then the refrigerant liquid level in the gas-liquid separation device is obtained.

[0083] S232, when the refrigerant liquid level is determined to be at an alert liquid level, the opening degree of the electronic expansion valve is adjusted to a first preset opening degree, the heating assembly is controlled to continue to operate for a third time length, and then the opening degree of the electronic expansion valve is adjusted according to the refrigerant liquid level after the third time length of heating.

[0084] In step S231 to step S232, when the magnetic induction switch 19 detects a magnetic field strength of E3, it indicates that the amount of liquid refrigerant in the gas-liquid separation device 8 is at the highest liquid level; the opening degree of the electronic expansion valve 18 is gradually closed to 0%, so that the refrigerant originally flowing back to the gas-liquid separation device 8 exists in the outdoor heat exchange pipeline and the refrigerant pipeline. At the same time, the system determines the state of the refrigerant in the suction pipe of the gas-liquid separation device 8 according to the signals fed back by the low-pressure sensor 9 and the temperature sensor 17. If the refrigerant state is determined to be gaseous, the air conditioner continues to operate in the current mode until the current mode is ended; if the refrigerant state is determined to be liquid or gaseous-liquid mixed, the heating assembly 20 is turned on to heat the refrigerant, and the air conditioner compressor continues to operate; if the heating assembly 20 operates for 30 minutes, and the amount of liquid refrigerant in the gas-liquid separation device 8 is at the warning liquid level, the opening degree of the electronic expansion valve 18 is gradually opened to 60%; if the heating assembly 20 operates for 60 minutes, and the amount of liquid refrigerant in the gas-liquid separation device 8 is at the normal liquid level, the opening degree of the electronic expansion valve 18 is gradually opened to 100%.

[0085] According to one embodiment of the present application, the step of controlling the air conditioner to operate the corresponding gas-liquid separation control program according to the refrigerant level further comprises:

[0086] S310, in response to the signal of switching the operation mode, acquiring the refrigerant level in the gas-liquid separation device.

[0087] S320, determining that the refrigerant level is at the warning liquid level, then gradually adjusting the opening degree of the electronic expansion valve to a second preset opening degree, and then continuously monitoring the refrigerant level and adjusting the opening degree of the electronic expansion valve according to the refrigerant level.

[0088] In step S310 to step S320, when the air conditioner switches to another operation mode, the system continues to monitor the amount of liquid refrigerant in the gas-liquid separation device 8. When the amount of liquid refrigerant is at the normal liquid level, the electronic expansion valve 18 is fully opened, and the air conditioner continues to operate normally; when the amount of liquid refrigerant is at the warning liquid level, the opening degree of the electronic expansion valve 18 is gradually opened from 0% to 60%, and the system continues to monitor the amount of liquid refrigerant in the gas-liquid separation device 8; when the amount of liquid refrigerant in the gas-liquid separation device 8 is at the normal liquid level, the electronic expansion valve 18 is fully opened, and the air conditioner continues to operate in the current mode; when the amount of liquid refrigerant is at the warning liquid level, the opening degree of the electronic expansion valve 18 is 0%, and the air conditioner is started to operate.

[0089] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An air conditioner characterized by comprising: At least comprising a compressor and a gas-liquid separation device, a suction port of the compressor is communicated with a suction pipe of the gas-liquid separation device; The gas-liquid separation device comprises: A shell, a containing cavity is formed in the shell; An air inlet pipe is connected to the shell, and an air outlet end of the air inlet pipe is located at a first height in the containing cavity; A suction pipe is connected to the shell, and a gas inlet end of the suction pipe is located at a second height in the containing cavity, the gas inlet end of the suction pipe and the air outlet end of the air inlet pipe have a spacing, and the first height is lower than the second height; A magnetic induction switch comprises a guide pipe, a magnetic floating ball and a magnetic induction element, the guide pipe is arranged in a direction from bottom to top and is connected to a top of the containing cavity, the magnetic floating ball is arranged in the guide pipe and moves along the guide pipe under the action of liquid buoyancy, the magnetic induction element is arranged at the top of the guide pipe, and the magnetic induction element generates a liquid level signal matched with the liquid level when cooperating with the magnetic floating ball; when the magnetic floating ball is located at a lowest position, a warning position and a highest position in the guide pipe, the magnetic induction element cooperates with the magnetic floating ball to generate a normal liquid level signal, a warning liquid level signal and a highest liquid level signal matched with the liquid level, and the highest position is lower than the second height; Further comprising a heating assembly connected to a side wall of the shell; The air conditioner is used to execute a control method of the air conditioner, comprising: In response to an air conditioner operation signal, a refrigerant liquid level in a gas-liquid separation device is acquired; According to the refrigerant liquid level, a corresponding gas-liquid separation control program of the air conditioner operation is controlled, and the gas-liquid separation control program at least comprises adjusting an opening degree of an electronic expansion valve; The step of controlling the air conditioner to run the corresponding gas-liquid separation control program according to the refrigerant liquid level specifically comprises: If the refrigerant liquid level is a normal liquid level, the air conditioner is controlled to maintain a current operation mode, and the opening degree of the electronic expansion valve is adjusted to a maximum opening degree; If the refrigerant liquid level is a warning liquid level, a refrigerant state before a suction port of the compressor is acquired, and the opening degree of the electronic expansion valve is adjusted and the heating assembly is controlled to operate according to the refrigerant state; If the refrigerant liquid level is a highest liquid level, the opening degree of the electronic expansion valve is closed, then the refrigerant state is acquired, and the opening degree of the electronic expansion valve is adjusted and the heating assembly is controlled to operate according to the refrigerant state.

2. The air conditioner of claim 1, wherein The warning position and the highest position have a preset safety distance.

3. The air conditioner according to claim 1 or 2, characterized by A low-pressure sensor and a temperature sensor are arranged on a suction pipe between the suction port of the compressor and the gas-liquid separation device.

4. A control method of an air conditioner as claimed in any one of claims 1 to 3, characterized in that, Comprise: In response to an air conditioner operation signal, a refrigerant liquid level in a gas-liquid separation device is acquired; According to the refrigerant liquid level, a corresponding gas-liquid separation control program of the air conditioner operation is controlled, and the gas-liquid separation control program at least comprises adjusting an opening degree of an electronic expansion valve; the step of controlling the air conditioner to run the corresponding gas-liquid separation control program according to the refrigerant liquid level specifically comprises: If the refrigerant liquid level is a normal liquid level, the air conditioner is controlled to maintain a current operation mode, and the opening degree of the electronic expansion valve is adjusted to a maximum opening degree; If the refrigerant level is determined to be the warning level, a state of the refrigerant before a suction port of the compressor is obtained, and an opening degree of the electronic expansion valve is adjusted and the heating assembly is controlled to operate according to the state of the refrigerant; If the refrigerant level is determined to be the highest level, the opening degree of the electronic expansion valve is closed, and then the state of the refrigerant is obtained, and the opening degree of the electronic expansion valve is adjusted and the heating assembly is controlled to operate according to the state of the refrigerant.

5. The control method of the air conditioner according to claim 4, characterized by, The step of adjusting the opening degree of the electronic expansion valve and controlling the heating assembly to operate according to the state of the refrigerant specifically comprises: If the state of the refrigerant is determined to be gaseous, the air conditioner is controlled to maintain a current operation mode; If the state of the refrigerant is determined to be liquid or gaseous-liquid mixed, the heating assembly is controlled to operate for a first time length, and then the opening degree of the electronic expansion valve is adjusted according to the state of the refrigerant after heating.

6. The control method of the air conditioner according to claim 4, wherein The step of adjusting the opening degree of the electronic expansion valve and controlling the heating assembly to operate according to the state of the refrigerant specifically comprises: If the state of the refrigerant is determined to be liquid or gaseous-liquid mixed, the heating assembly is controlled to operate for a second time length, and then a refrigerant level in the gas-liquid separation device is obtained; If the refrigerant level is determined to be the warning level, the opening degree of the electronic expansion valve is adjusted to a first preset opening degree, and the heating assembly is controlled to continue operating for a third time length, and then the opening degree of the electronic expansion valve is adjusted according to the refrigerant level after the heating assembly is operated for the third time length.

7. The control method of an air conditioner according to any one of claims 4 to 6, characterized by, The step of controlling the air conditioner to operate the corresponding gas-liquid separation control program according to the refrigerant level further comprises: In response to a signal of switching an operation mode, a refrigerant level in a gas-liquid separation device is obtained; If the refrigerant level is determined to be the warning level, the opening degree of the electronic expansion valve is gradually adjusted to a second preset opening degree, and then the refrigerant level is continuously monitored, and the opening degree of the electronic expansion valve is adjusted according to the refrigerant level.

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