Air conditioner and liquid impact prevention control method thereof

Abstract

The invention provides an air conditioner and a liquid impact prevention control method thereof, the air conditioner comprises a compressor, a gas-liquid separator, a bypass pipe, an electromagnetic valve and a controller, and the controller is configured to determine an operation mode of the air conditioner; controlling the opening and closing state of the electromagnetic valve according to the operation mode of the air conditioner; the liquid refrigerant is heated and / or the temperature of the liquid refrigerant is kept unchanged according to the opening and closing state of the electromagnetic valve, the refrigerant liquid is prevented from being sucked into the compressor to cause liquid impact, the liquid impact prevention probability of the air conditioner is reduced, and therefore the air conditioner can operate normally, and the capacity and energy efficiency of the air conditioner are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioner and a liquid impact prevention control method thereof. Background Art

[0002] Due to reasons related to the air conditioner or after maintenance, the amount of liquid refrigerant filled is large, resulting in the liquid refrigerant not completely evaporating in the evaporator, the superheat is low, and the liquid refrigerant is sucked into the compressor, causing liquid hammer, causing the air conditioner outdoor unit to make excessive noise, and the compressor is extremely easy to be damaged. At the same time, most of the liquid refrigerant accumulates in the gas-liquid separator, resulting in low energy efficiency of the air conditioner. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0004] To this end, an object of the present invention is to provide an air conditioner that prevents refrigerant liquid from being sucked into the compressor to cause liquid hammer, reduces the probability of liquid hammer prevention of the air conditioner, thereby allowing the air conditioner to operate normally and improving the energy efficiency of the air conditioner.

[0005] To this end, a second object of the present invention is to provide an anti-liquid impact control method for an air conditioner.

[0006] In order to achieve the above-mentioned purpose, an embodiment of the first aspect of the present invention proposes an air conditioner, which includes: a compressor; a gas-liquid separator for storing liquid refrigerant; a bypass pipe connected to the exhaust pipe of the compressor and the gas-liquid separator, and used to connect the exhaust pipe of the compressor and the passage of the gas-liquid separator; a solenoid valve arranged on the bypass pipe, and used to open or close the passage; a controller, configured to: determine the operating mode of the air conditioner; control the opening and closing state of the solenoid valve according to the operating mode of the air conditioner; heat the liquid refrigerant and / or keep the temperature of the liquid refrigerant unchanged according to the opening and closing state of the solenoid valve.

[0007] According to the air conditioner of the embodiment of the present invention, in different operation modes of the air conditioner, the electromagnetic valve is controlled to open the passage between the exhaust pipe of the compressor and the gas-liquid separator, the high-temperature and high-pressure gas of the compressor is controlled to enter the gas-liquid separator, the liquid refrigerant in the gas-liquid separator is heated, and the liquid refrigerant that has not been completely evaporated in the evaporator absorbs heat and vaporizes, so as to avoid the liquid refrigerant from being deposited in the gas-liquid separator, and at the same time, the suction temperature and suction pressure of the compressor are increased to prevent the air conditioner from having a liquid hammer phenomenon; and / or the electromagnetic valve is controlled to close the passage between the exhaust pipe of the compressor and the gas-liquid separator, so as to keep the temperature of the liquid refrigerant unchanged, so as to reduce the energy consumption of the air conditioner, and the high-temperature and high-pressure gas entering the gas-liquid separator is controlled by adjusting the opening and closing state of the electromagnetic valve, so as to heat and / or keep the temperature of the liquid refrigerant in the gas-liquid separator unchanged, so as to prevent the refrigerant liquid from being sucked into the compressor to cause liquid hammer, and reduce the probability of anti-liquid hammer of the air conditioner, so that the air conditioner can operate normally and improve the energy efficiency of the air conditioner.

[0008] In some embodiments, when controlling the opening and closing state of the solenoid valve according to the operating mode of the air conditioner, the controller is configured as follows: when the air conditioner is in cooling operation, the solenoid valve is controlled to be in a closed state; when the air conditioner is in heating operation or defrosting operation, the solenoid valve is controlled to be in an open state.

[0009] In some embodiments, when the liquid refrigerant is heated and / or the temperature of the liquid refrigerant is kept constant according to the opening and closing state of the solenoid valve, the controller is configured as follows: when the air conditioner is in cooling operation, the coil temperature of the evaporator and the suction temperature of the compressor are obtained; the superheat is determined according to the coil temperature and the suction temperature; according to the superheat, the solenoid valve is controlled to maintain the closed state to keep the temperature of the liquid refrigerant constant, or, according to the superheat, the solenoid valve is controlled to switch from the closed state to the open state to heat the liquid refrigerant.

[0010] In some embodiments, when the solenoid valve is controlled to maintain the closed state according to the superheat, the controller is configured to: when the superheat exceeds a preset superheat, control the solenoid valve to maintain the closed state.

[0011] In some embodiments, when controlling the solenoid valve to switch from the closed state to the open state according to the superheat, the controller is configured to: if the superheat does not exceed a preset superheat, control the solenoid valve to switch from the closed state to the open state.

[0012] In some embodiments, when heating the liquid refrigerant, the controller is configured to: introduce all high-temperature and high-pressure gas of the compressor into the gas-liquid separator to heat the liquid refrigerant.

[0013] In some embodiments, when the liquid refrigerant is heated and / or the temperature of the liquid refrigerant is maintained unchanged according to the opening and closing state of the solenoid valve, the controller is configured to: when the air conditioner is in heating operation, determine whether the air conditioner has a liquid backflow failure; if so, introduce all the high-temperature and high-pressure gas of the compressor into the gas-liquid separator to heat the liquid refrigerant; otherwise, introduce a preset volume of high-temperature and high-pressure gas of the compressor into the gas-liquid separator to heat the liquid refrigerant.

[0014] In some embodiments, when the liquid refrigerant is heated and / or the temperature of the liquid refrigerant is maintained unchanged according to the opening and closing state of the solenoid valve, the controller is also configured to: when the air conditioner is operating in ultra-low temperature conditions for heating, introduce a preset volume of high-temperature and high-pressure gas from the compressor into the gas-liquid separator to heat the liquid refrigerant.

[0015] In some embodiments, when the liquid refrigerant is heated and / or the temperature of the liquid refrigerant is kept unchanged according to the opening and closing state of the solenoid valve, the controller is configured as follows: when the air conditioner is in defrosting operation, the indoor fan is controlled to stop rotating, and a preset volume of high-temperature and high-pressure gas from the compressor is introduced into the gas-liquid separator to heat the liquid refrigerant.

[0016] In order to achieve the above-mentioned purpose, an embodiment of the second aspect of the present invention proposes an anti-liquid hammer control method for an air conditioner, and the anti-liquid hammer control method for the air conditioner includes: determining the operating mode of the air conditioner; controlling the opening and closing state of the solenoid valve according to the operating mode of the air conditioner; heating the liquid refrigerant and / or keeping the temperature of the liquid refrigerant unchanged according to the opening and closing state of the solenoid valve.

[0017] According to the anti-liquid hammer control method of the air conditioner according to the embodiment of the present invention, in different operation modes of the air conditioner, the electromagnetic valve is controlled to open the passage between the exhaust pipe of the compressor and the gas-liquid separator, the high-temperature and high-pressure gas of the compressor is controlled to enter the gas-liquid separator, the liquid refrigerant in the gas-liquid separator is heated, and the liquid refrigerant that has not been completely evaporated in the evaporator absorbs heat and vaporizes, and the liquid refrigerant is prevented from being deposited in the gas-liquid separator, while the suction temperature and suction pressure of the compressor are increased to prevent the air conditioner from having a liquid hammer phenomenon; and / or the electromagnetic valve is controlled to close the passage between the exhaust pipe of the compressor and the gas-liquid separator, the temperature of the liquid refrigerant is kept constant to reduce the energy consumption of the air conditioner, the high-temperature and high-pressure gas entering the gas-liquid separator is controlled by adjusting the opening and closing state of the electromagnetic valve, the liquid refrigerant in the gas-liquid separator is heated and / or the temperature is kept constant to prevent the refrigerant liquid from being sucked into the compressor to cause liquid hammer, and the anti-liquid hammer probability of the air conditioner is reduced, so that the air conditioner can operate normally and the energy efficiency of the air conditioner is improved.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 is a structural block diagram of an air conditioner according to an embodiment of the present invention;

[0021] Figure 2 is a circuit diagram of an air conditioner according to an embodiment of the present invention;

[0022] Figure 3 is a flow chart of a liquid shock prevention control method of an air conditioner in cooling operation according to an embodiment of the present invention;

[0023] Figure 4 is a flow chart of a liquid shock prevention control method for an air conditioner in heating operation according to an embodiment of the present invention;

[0024] Figure 5 is a flow chart of a liquid shock prevention control method for an air conditioner in defrosting operation according to an embodiment of the present invention;

[0025] Figure 6 is a flow chart of an anti-liquid impact control method for an air conditioner according to an embodiment of the present invention;

[0026] Figure 7 is a flow chart of an anti-liquid impact control method for an air conditioner according to an embodiment of the present invention.

[0027] Reference numerals: air conditioner 1;

[0028] Compressor 11; gas-liquid separator 12; bypass pipe 13; solenoid valve 14; controller 15. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The air conditioner of the present invention performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve and an evaporator. 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.

[0033] 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 the heat is released to the surrounding environment through the condensation process.

[0034] The expansion valve expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-temperature and low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the low-temperature and low-pressure refrigerant gas to the compressor. The evaporator can achieve a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the entire cycle, the air conditioner can adjust the temperature of the indoor space.

[0035] The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.

[0036] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioner functions as a heater in a heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner functions as a cooler in a cooling mode.

[0037] Combine the following Figure 1-Figure 6 An air conditioner 1 according to an embodiment of the present invention will be described.

[0038] like Figure 1 and Figure 2 As shown, the air conditioner 1 of the embodiment of the present invention comprises: a compressor 11, a gas-liquid separator 12, a bypass pipe 13, a solenoid valve 14 and a controller 15, wherein:

[0039] The gas-liquid separator 12 is used to store liquid refrigerant; the bypass pipe 13 is connected to the exhaust pipe of the compressor 11 and the gas-liquid separator 12, and is used to connect the exhaust pipe of the compressor 11 and the passage of the gas-liquid separator 12; the solenoid valve 14 is arranged on the bypass pipe 13, and is used to open or close the passage; the controller 15 is configured to: determine the operating mode of the air conditioner 1; control the opening and closing state of the solenoid valve 14 according to the operating mode of the air conditioner 1; heat the liquid refrigerant and / or keep the temperature of the liquid refrigerant unchanged according to the opening and closing state of the solenoid valve 14.

[0040] In an embodiment, after the air conditioner 1 starts running, the controller 15 determines the current operating mode of the air conditioner 1, and the operating modes include, for example, cooling operation, heating operation and defrosting operation; after determining the operating mode of the air conditioner 1, the different initial opening and closing states of the solenoid valve 14 in different operating modes are determined, for example, the initial opening and closing state of the solenoid valve 14 is controlled to be an open state or a closed state.

[0041] After determining different initial opening and closing states, the opening and closing states of the solenoid valve 14 are adaptively controlled in different operating modes. For example, when the operating mode of the air conditioner 1 is cooling operation, according to the opening and closing states of the solenoid valve 14, the exhaust pipe of the compressor 11 and the flow path of the gas-liquid separator 12 are connected, and the high-temperature and high-pressure gas of the compressor 11 is introduced into the gas-liquid separator 12 through the exhaust pipe of the compressor 11 and the bypass pipe 13, and the liquid refrigerant is heated, so that the liquid refrigerant that has not been completely evaporated in the evaporator absorbs heat and vaporizes, and the liquid refrigerant is prevented from being deposited in the gas-liquid separator 12. At the same time, the high-temperature and high-pressure gas is mixed with the low-pressure gas in the gas-liquid separator 12 to increase the suction temperature and suction pressure of the compressor 11, and prevent the air conditioner 1 from having a liquid hammer phenomenon, and / or the exhaust pipe of the compressor 11 and the flow path of the gas-liquid separator 12 are disconnected to keep the temperature of the liquid refrigerant unchanged, so as to reduce the energy consumption of the air conditioner 1.

[0042] When the operation mode of the air conditioner 1 is heating operation, according to the opening and closing state of the solenoid valve 14, the exhaust pipe of the compressor 11 is connected to the flow path of the gas-liquid separator 12, and the high-temperature and high-pressure gas of the compressor 11 is introduced into the gas-liquid separator 12 through the exhaust pipe of the compressor 11 and the bypass pipe 13, heating the liquid refrigerant, so that the liquid refrigerant that has not been completely evaporated in the evaporator absorbs heat and vaporizes, thereby preventing the liquid refrigerant from being deposited in the gas-liquid separator 12. At the same time, the high-temperature and high-pressure gas is mixed with the low-pressure gas in the gas-liquid separator 12, thereby increasing the suction temperature and suction pressure of the compressor 11, thereby preventing the air conditioner 1 from having liquid hammer.

[0043] When the operation mode of the air conditioner 1 is defrosting operation, according to the opening and closing state of the solenoid valve 14, the exhaust pipe of the compressor 11 is connected to the flow path of the gas-liquid separator 12, and the high-temperature and high-pressure gas of the compressor 11 is introduced into the gas-liquid separator 12 through the exhaust pipe of the compressor 11 and the bypass pipe 13, heating the liquid refrigerant, so that the liquid refrigerant that has not been completely evaporated in the evaporator absorbs heat and vaporizes, and prevents the liquid refrigerant from being deposited in the gas-liquid separator 12. At the same time, the high-temperature and high-pressure gas is mixed with the low-pressure gas in the gas-liquid separator 12 to increase the suction temperature and suction pressure of the compressor 11, and prevent the air conditioner 1 from having liquid hammer. By controlling the solenoid valve 14 to open or close the flow path, the high-temperature and high-pressure gas entering the gas-liquid separator 12 is adjusted to heat the liquid refrigerant in the gas-liquid separator 12 and / or keep the temperature unchanged, so that the air conditioner 1 can operate normally and improve the energy efficiency of the air conditioner 1.

[0044] According to the air conditioner 1 of the embodiment of the present invention, in different operation modes of the air conditioner 1, the passage between the exhaust pipe of the compressor 11 and the gas-liquid separator 12 is opened by controlling the solenoid valve 14, and the high-temperature and high-pressure gas of the compressor 11 is controlled to enter the gas-liquid separator 12, so that the liquid refrigerant in the gas-liquid separator 12 is heated, so that the liquid refrigerant that is not completely evaporated in the evaporator absorbs heat and gasifies, and the liquid refrigerant is prevented from being deposited in the gas-liquid separator 12, and the suction temperature and suction pressure of the compressor 11 are increased, so as to prevent the air conditioner 1 from having a liquid hammer phenomenon; and / or control the solenoid valve 14 to close the passage between the exhaust pipe of the compressor 11 and the gas-liquid separator 12, keep the temperature of the liquid refrigerant unchanged, so as to reduce the energy consumption of the air conditioner 1, and control the high-temperature and high-pressure gas entering the gas-liquid separator 12 by adjusting the opening and closing state of the solenoid valve 14, heat the liquid refrigerant in the gas-liquid separator 12 and / or keep the temperature unchanged, prevent the refrigerant liquid from being sucked into the compressor 11 to cause liquid hammer, reduce the probability of anti-liquid hammer of the air conditioner 1, so that the air conditioner 1 can operate normally, and improve the energy efficiency of the air conditioner 1.

[0045] In some embodiments, when controlling the opening and closing state of the solenoid valve 14 according to the operating mode of the air conditioner 1, the controller 15 is configured as follows: when the air conditioner 1 is in cooling operation, the solenoid valve 14 is controlled to be in a closed state; when the air conditioner 1 is in heating operation or defrosting operation, the solenoid valve 14 is controlled to be in an open state.

[0046] In the embodiment, when the operating mode of the air conditioner 1 is determined to be cooling operation, the solenoid valve 14 is controlled to be in a closed state; when the operating mode of the air conditioner 1 is determined to be heating operation or defrosting operation, the solenoid valve 14 is controlled to be in an open state to determine the initial opening and closing states of the solenoid valve 14 in different operating modes.

[0047] In some embodiments, when heating the liquid refrigerant and / or maintaining the temperature of the liquid refrigerant unchanged according to the opening and closing state of the solenoid valve 14, the controller 15 is configured as follows: when the air conditioner 1 is in cooling operation, the coil temperature of the evaporator and the suction temperature of the compressor 11 are obtained; the superheat is determined according to the coil temperature and the suction temperature; according to the superheat, the solenoid valve 14 is controlled to remain in a closed state to maintain the temperature of the liquid refrigerant unchanged, or, according to the superheat, the solenoid valve 14 is controlled to switch from a closed state to an open state to heat the liquid refrigerant.

[0048] In the embodiments, the following reference is made to Figure 3 A method for preventing liquid hammer from occurring during cooling operation of the air conditioner 1 of an embodiment of the present invention is described. When the operating mode of the air conditioner 1 is determined to be cooling operation, since both the indoor ambient temperature and the outdoor ambient temperature are relatively high, the suction temperature of the compressor 11 is relatively high. Liquid hammer is not likely to occur during normal operation, but may occur when the amount of liquid refrigerant charged is too large. The coil temperature of the evaporator and the suction temperature of the compressor 11 are obtained, and the superheat is determined based on the coil temperature and the suction temperature. The opening and closing state of the solenoid valve 14 is adaptively controlled based on the relationship between the superheat and a preset superheat, such as 0. For example, the solenoid valve 14 is controlled to remain in a closed state, thereby effectively reducing the energy consumption of the air conditioner 1 while maintaining the temperature of the liquid refrigerant unchanged; or the solenoid valve 14 is controlled to switch from a closed state to an open state to heat the liquid refrigerant, thereby preventing liquid hammer from occurring in the air conditioner 1.

[0049] In some embodiments, when the solenoid valve 14 is controlled to remain in a closed state according to the superheat degree, the controller 15 is configured to control the solenoid valve 14 to remain in a closed state when the superheat degree exceeds a preset superheat degree.

[0050] In the embodiment, after the superheat is determined, the relationship between the superheat and a preset superheat, such as 0, is judged. When the superheat exceeds the preset superheat, it is considered that the temperature at this time can allow the liquid refrigerant that has not been fully evaporated to absorb heat and vaporize, and the air conditioner 1 will not experience liquid hammer. The solenoid valve 14 is controlled to remain in a closed state to reduce the energy consumption of the air conditioner 1.

[0051] In some embodiments, when the solenoid valve 14 is switched from a closed state to an open state according to the superheat, the controller 15 is configured to control the solenoid valve 14 to switch from a closed state to an open state if the superheat does not exceed a preset superheat.

[0052] In the embodiment, after determining the superheat, the magnitude relationship between the superheat and a preset superheat, such as 0, is determined. When the superheat does not exceed the preset superheat, it is considered that the temperature at this time cannot make the liquid refrigerant that has not been fully evaporated absorb heat and gasify, and the air conditioner 1 may have a liquid hammer phenomenon. Then the solenoid valve 14 is controlled to switch from a closed state to an open state to continue heating the liquid refrigerant, prevent the compressor 11 from having a liquid hammer phenomenon, avoid damage to the compressor, improve the reliability of the compressor 11, and thus increase the service life of the compressor. By adjusting the opening and closing state of the solenoid valve 14 according to the relationship between the superheat and the preset superheat, the high-temperature and high-pressure gas entering the gas-liquid separator 12 is controlled.

[0053] In some embodiments, when heating the liquid refrigerant, the controller 15 is configured to introduce all the high-temperature and high-pressure gas of the compressor 11 into the gas-liquid separator 12 to heat the liquid refrigerant.

[0054] In the embodiment, a capillary tube is provided in the gas-liquid separator 12. After the solenoid valve 14 is controlled to switch from a closed state to an open state, all the high-temperature and high-pressure gases of the compressor 11 are introduced into the capillary tube in the gas-liquid separator 12 through the exhaust pipe and the bypass pipe 13 of the compressor 11 to heat the liquid refrigerant in the gas-liquid separator 12, so that the liquid refrigerant that has not been completely evaporated in the evaporator absorbs heat and vaporizes, thereby preventing the liquid refrigerant from being deposited in the gas-liquid separator 12. By involving all the high-temperature and high-pressure gases in the refrigeration operation, the probability of preventing liquid hammer of the air conditioner 1 is reduced, thereby improving the operation efficiency of the air conditioner 1.

[0055] In some embodiments, when heating the liquid refrigerant and / or maintaining the temperature of the liquid refrigerant unchanged according to the opening and closing state of the solenoid valve 14, the controller 15 is configured as follows: when the air conditioner 1 is in heating operation, determine whether a liquid return fault occurs in the air conditioner 1; if so, introduce all the high-temperature and high-pressure gas of the compressor 11 into the gas-liquid separator 12 to heat the liquid refrigerant; otherwise, introduce a preset volume of high-temperature and high-pressure gas of the compressor 11 into the gas-liquid separator 12 to heat the liquid refrigerant.

[0056] In the embodiments, the following reference is made to Figure 4The present invention describes an anti-liquid hammer control method for the air conditioner 1 during heating operation according to an embodiment of the present invention. When the operation mode of the air conditioner 1 is determined to be heating operation, since both the indoor ambient temperature and the outdoor ambient temperature are relatively low, resulting in relatively low suction temperature and suction pressure of the compressor 11, it is determined whether the air conditioner 1 has a liquid backflow fault. If the air conditioner 1 has a liquid backflow fault, the solenoid valve 14 is opened to introduce all high-temperature and high-pressure gases of the compressor 11 into the capillary tube in the gas-liquid separator 12 through the exhaust pipe and the bypass pipe 13 of the compressor 11 to heat the liquid refrigerant in the gas-liquid separator 12, so that the liquid refrigerant that has not been completely evaporated in the evaporator absorbs heat and vaporizes, thereby preventing the liquid refrigerant from being deposited in the gas-liquid separator 12. By involving all high-temperature and high-pressure gases in the heating operation, the anti-liquid hammer probability of the air conditioner 1 is reduced, thereby improving the operation efficiency of the air conditioner 1.

[0057] If the air conditioner 1 has no liquid return failure, the solenoid valve 14 is opened to introduce a preset volume of high-temperature and high-pressure gas from the compressor 11 into the capillary in the gas-liquid separator 12 through the exhaust pipe and bypass pipe 13 of the compressor 11 to heat the liquid refrigerant in the gas-liquid separator 12. The preset volume of high-temperature and high-pressure gas is mixed with the low-pressure gas in the gas-liquid separator 12 to increase the suction temperature and suction pressure of the compressor 11, and at the same time increase the exhaust temperature and exhaust pressure. By involving the preset volume of high-temperature and high-pressure gas in the heating operation, the suction temperature of the compressor 11 under low-temperature conditions is increased, thereby improving the heating effect of the air conditioner 1 and achieving air replenishment and enthalpy increase.

[0058] In some embodiments, when the liquid refrigerant is heated and / or the temperature of the liquid refrigerant is maintained unchanged according to the opening and closing state of the solenoid valve 14, the controller 15 is also configured as follows: when the air conditioner 1 is operating in ultra-low temperature conditions for heating, a preset volume of high-temperature and high-pressure gas from the compressor 11 is introduced into the gas-liquid separator 12 to heat the liquid refrigerant.

[0059] In the embodiment, when it is determined that the operating mode of the air conditioner 1 is heating operation, it is judged whether the air conditioner 1 is operating in heating operation under ultra-low temperature conditions, i.e., a temperature below 1K. When the air conditioner 1 is operating in heating operation under ultra-low temperature conditions, since a large amount of liquid refrigerant is deposited in the gas-liquid separator 12, the evaporation pressure is extremely low, resulting in poor operation of the compressor 11. The solenoid valve 14 is opened to introduce a preset volume of high-temperature and high-pressure gas of the compressor 11 into the capillary in the gas-liquid separator 12 through the exhaust pipe and the bypass pipe 13 of the compressor 11 to heat the liquid refrigerant in the gas-liquid separator 12. The preset volume of high-temperature and high-pressure gas is mixed with the low-pressure gas in the gas-liquid separator 12 to increase the suction temperature and suction pressure of the compressor 11. At the same time, the operating state of the compressor 11 is optimized. By involving the preset volume of high-temperature and high-pressure gas in the heating operation, the suction temperature of the compressor 11 under ultra-low temperature conditions is increased, thereby increasing the operating life of the compressor 11.

[0060] In some embodiments, when the liquid refrigerant is heated and / or the temperature of the liquid refrigerant is kept unchanged according to the opening and closing state of the solenoid valve 14, the controller 15 is configured as follows: when the air conditioner 1 is in defrosting operation, the indoor fan is controlled to stop rotating, and a preset volume of high-temperature and high-pressure gas from the compressor 11 is introduced into the gas-liquid separator 12 to heat the liquid refrigerant.

[0061] In the embodiments, the following reference is made to Figure 5 The present invention describes an anti-liquid hammer control method for the air conditioner 1 during defrost operation. When the operation mode of the air conditioner 1 is determined to be defrost operation, since the condenser on the outdoor side of the air conditioner 1 is covered with frost and the outdoor ambient temperature is low, the condensing temperature of the air conditioner 1, the suction temperature and the suction pressure of the compressor 11 are low. The indoor fan is controlled to stop rotating, the evaporator stops exchanging heat with the indoor room, the evaporation temperature is lowered, and the solenoid valve 14 is opened to introduce a preset volume of high-temperature and high-pressure gas of the compressor 11 into the capillary in the gas-liquid separator 12 through the exhaust pipe and the bypass pipe 13 of the compressor 11 to heat the liquid refrigerant in the gas-liquid separator 12. The preset volume of high-temperature and high-pressure gas is mixed with the low-pressure gas in the gas-liquid separator 12 to increase the suction temperature and suction pressure of the compressor 11. By involving the preset volume of high-temperature and high-pressure gas in the defrost operation, the defrost operation state of the air conditioner 1 is optimized and the defrost process of the air conditioner 1 is accelerated.

[0062] Reference below Figure 6 The anti-liquid impact control method for an air conditioner according to an embodiment of the present invention is described by way of example.

[0063] like Figure 6 As shown, the anti-liquid impact control method for an air conditioner according to an embodiment of the present invention at least includes steps S11 to S29.

[0064] Step S11, determining the operation mode of the air conditioner.

[0065] Step S12, determining whether the air conditioner is in cooling operation, if so, executing step S13; otherwise, executing step S20.

[0066] Step S13, controlling the solenoid valve to be in a closed state.

[0067] Step S14, obtaining the coil temperature of the evaporator and the suction temperature of the compressor.

[0068] Step S15, determining the superheat according to the coil temperature and the suction temperature.

[0069] Step S16, determining whether the superheat exceeds a preset superheat, if so, executing step S17; otherwise, executing step S18.

[0070] Step S17, controlling the solenoid valve to remain in a closed state to keep the temperature of the liquid refrigerant unchanged.

[0071] Step S18, controlling the solenoid valve to switch from a closed state to an open state.

[0072] Step S19, introducing all high-temperature and high-pressure gas from the compressor into the gas-liquid separator to heat the liquid refrigerant.

[0073] Step S20, determining whether the air conditioner is in heating operation, if so, executing step S21; otherwise, executing step S27.

[0074] Step S21, controlling the solenoid valve to be in an open state.

[0075] Step S22, determining whether the air conditioner has a liquid backflow fault, if so, executing step S23; otherwise, executing step S24.

[0076] Step S23, introducing all high-temperature and high-pressure gas from the compressor into the gas-liquid separator to heat the liquid refrigerant.

[0077] Step S24, introducing a preset volume of high-temperature and high-pressure gas from the compressor into the gas-liquid separator to heat the liquid refrigerant.

[0078] Step S25, determining whether the air conditioner is operating in ultra-low temperature heating mode, if so, executing step S26; otherwise, executing step S22.

[0079] Step S26, introducing a preset volume of high-temperature and high-pressure gas from the compressor into the gas-liquid separator to heat the liquid refrigerant.

[0080] Step S27, determining whether the air conditioner is in defrosting operation, if so, executing step S28; otherwise, executing step S11.

[0081] Step S28, controlling the solenoid valve to be in an open state.

[0082] Step S29, controlling the indoor fan to stop rotating, and introducing a preset volume of high-temperature and high-pressure gas from the compressor into the gas-liquid separator to heat the liquid refrigerant.

[0083] According to the air conditioner 1 of the embodiment of the present invention, in different operation modes of the air conditioner 1, the electromagnetic valve 14 is controlled to open the passage between the exhaust pipe of the compressor 11 and the gas-liquid separator 12, and the high-temperature and high-pressure gas of the compressor is controlled to enter the gas-liquid separator 12, and the liquid refrigerant in the gas-liquid separator 12 is heated, so that the liquid refrigerant that is not completely evaporated in the evaporator absorbs heat and vaporizes, and the liquid refrigerant is prevented from being deposited in the gas-liquid separator 12, while the suction temperature and suction pressure of the compressor 11 are increased to prevent the air conditioner 1 from having a liquid hammer phenomenon; and / or the electromagnetic valve 14 is controlled to close the passage between the exhaust pipe of the compressor 11 and the gas-liquid separator 12, so as to keep the temperature of the liquid refrigerant unchanged, so as to reduce the energy consumption of the air conditioner 1, and the high-temperature and high-pressure gas entering the gas-liquid separator 12 is controlled by adjusting the opening and closing state of the electromagnetic valve 14, so as to heat and / or keep the temperature of the liquid refrigerant in the gas-liquid separator 12 unchanged, so as to prevent the refrigerant liquid from being sucked into the compressor 11 to cause liquid hammer, and reduce the probability of preventing liquid hammer of the air conditioner 1, so that the air conditioner 1 can operate normally, and the energy efficiency of the air conditioner 1 is improved.

[0084] Combine the following Figure 7 The anti-liquid impact control method for an air conditioner according to an embodiment of the present invention is described by way of example.

[0085] As shown in the figure, the anti-liquid impact control method for an air conditioner according to an embodiment of the present invention at least includes steps S1 to S3.

[0086] Step S1, determining the operation mode of the air conditioner.

[0087] In an embodiment, after the air conditioner starts to operate, the controller determines the current operation mode of the air conditioner, and the operation modes include, for example, cooling operation, heating operation, and defrosting operation.

[0088] Step S2, controlling the opening and closing state of the solenoid valve according to the operation mode of the air conditioner.

[0089] In an embodiment, after determining the operation mode of the air conditioner, different initial opening and closing states of the solenoid valve in different operation modes are determined, for example, the initial opening and closing state of the solenoid valve is controlled to be an open state or a closed state.

[0090] Step S3, heating the liquid refrigerant and / or keeping the temperature of the liquid refrigerant unchanged according to the opening and closing state of the solenoid valve.

[0091] In an embodiment, after determining different initial opening and closing states, the opening and closing states of the solenoid valve are adaptively controlled in different operating modes. For example, when the operating mode of the air conditioner is cooling operation, the exhaust pipe of the compressor and the flow path of the gas-liquid separator are connected according to the opening and closing state of the solenoid valve, and the high-temperature and high-pressure gas of the compressor is introduced into the gas-liquid separator through the exhaust pipe and the bypass pipe of the compressor to heat the liquid refrigerant, so that the liquid refrigerant that has not been completely evaporated in the evaporator absorbs heat and vaporizes, thereby avoiding the liquid refrigerant from being deposited in the gas-liquid separator. At the same time, the high-temperature and high-pressure gas is mixed with the low-pressure gas in the gas-liquid separator to increase the suction temperature and suction pressure of the compressor, thereby preventing the air conditioner from experiencing liquid hammer, and / or disconnecting the exhaust pipe of the compressor and the flow path of the gas-liquid separator to keep the temperature of the liquid refrigerant unchanged, thereby reducing the energy consumption of the air conditioner.

[0092] When the air conditioner is in heating mode, according to the opening and closing state of the solenoid valve, the exhaust pipe of the compressor is connected with the flow path of the gas-liquid separator. The high-temperature and high-pressure gas of the compressor is introduced into the gas-liquid separator through the exhaust pipe and the bypass pipe of the compressor, heating the liquid refrigerant, so that the liquid refrigerant that has not been completely evaporated in the evaporator absorbs heat and vaporizes, avoiding the liquid refrigerant from being deposited in the gas-liquid separator. At the same time, the high-temperature and high-pressure gas is mixed with the low-pressure gas in the gas-liquid separator to increase the suction temperature and suction pressure of the compressor, thereby preventing liquid hammer from occurring in the air conditioner.

[0093] When the air conditioner is in defrosting mode, the high-temperature and high-pressure gas of the compressor is introduced into the gas-liquid separator through the exhaust pipe and bypass pipe of the compressor to heat the liquid refrigerant, so that the liquid refrigerant that has not been completely evaporated in the evaporator absorbs heat and vaporizes, and the liquid refrigerant is prevented from being deposited in the gas-liquid separator. At the same time, the high-temperature and high-pressure gas is mixed with the low-pressure gas in the gas-liquid separator to increase the suction temperature and suction pressure of the compressor and prevent the air conditioner from having liquid hammer. By controlling the solenoid valve to open or close the flow passage, the high-temperature and high-pressure gas entering the gas-liquid separator is adjusted to heat the liquid refrigerant in the gas-liquid separator and / or keep the temperature unchanged, so that the air conditioner can operate normally and improve the energy efficiency of the air conditioner.

[0094] According to the anti-liquid hammer control method of the air conditioner according to the embodiment of the present invention, in different operation modes of the air conditioner, the electromagnetic valve is controlled to open the passage between the exhaust pipe of the compressor and the gas-liquid separator, the high-temperature and high-pressure gas of the compressor is controlled to enter the gas-liquid separator, the liquid refrigerant in the gas-liquid separator is heated, and the liquid refrigerant that has not been completely evaporated in the evaporator absorbs heat and vaporizes, and the liquid refrigerant is prevented from being deposited in the gas-liquid separator, while the suction temperature and suction pressure of the compressor are increased to prevent the air conditioner from having a liquid hammer phenomenon; and / or the electromagnetic valve is controlled to close the passage between the exhaust pipe of the compressor and the gas-liquid separator, the temperature of the liquid refrigerant is kept constant to reduce the energy consumption of the air conditioner, the high-temperature and high-pressure gas entering the gas-liquid separator is controlled by adjusting the opening and closing state of the electromagnetic valve, the liquid refrigerant in the gas-liquid separator is heated and / or the temperature is kept constant to prevent the refrigerant liquid from being sucked into the compressor to cause liquid hammer, and the anti-liquid hammer probability of the air conditioner is reduced, so that the air conditioner can operate normally and the energy efficiency of the air conditioner is improved.

[0095] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0096] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An air conditioner, characterized in that: include: compressor; A gas-liquid separator for storing liquid refrigerant; A bypass pipe connected to the exhaust pipe of the compressor and the gas-liquid separator, and used for connecting the exhaust pipe of the compressor with the passage of the gas-liquid separator; a solenoid valve, disposed on the bypass pipe, for opening or closing the flow through the passage; A controller configured to: determine an operating mode of the air conditioner; controlling the opening and closing state of the solenoid valve according to the operating mode of the air conditioner; The liquid refrigerant is heated and / or the temperature of the liquid refrigerant is kept constant according to the opening and closing state of the solenoid valve.

2. The air conditioner according to claim 1, characterized in that: When controlling the opening and closing state of the solenoid valve according to the operation mode of the air conditioner, the controller is configured as follows: When the air conditioner is in cooling operation, the solenoid valve is controlled to be in a closed state; When the air conditioner is in heating operation or defrosting operation, the solenoid valve is controlled to be in an open state.

3. The air conditioner according to claim 2, characterized in that: When heating the liquid refrigerant and / or maintaining the temperature of the liquid refrigerant unchanged according to the opening and closing state of the solenoid valve, the controller is configured as follows: When the air conditioner is in cooling operation, the coil temperature of the evaporator and the suction temperature of the compressor are obtained; determining superheat according to the coil temperature and the suction temperature; The solenoid valve is controlled to maintain the closed state according to the superheat degree to keep the temperature of the liquid refrigerant unchanged, or the solenoid valve is controlled to switch from the closed state to the open state according to the superheat degree to heat the liquid refrigerant.

4. The air conditioner according to claim 3, characterized in that: When controlling the solenoid valve to maintain the closed state according to the superheat, the controller is configured as follows: If the superheat exceeds a preset superheat, the solenoid valve is controlled to maintain the closed state.

5. The air conditioner according to claim 3, characterized in that: When the solenoid valve is controlled to switch from the closed state to the open state according to the superheat, the controller is configured as follows: If the superheat degree does not exceed the preset superheat degree, the solenoid valve is controlled to switch from the closed state to the open state.

6. The air conditioner according to claim 3, characterized in that: When heating the liquid refrigerant, the controller is configured to: All high-temperature and high-pressure gas from the compressor is introduced into the gas-liquid separator to heat the liquid refrigerant.

7. The air conditioner according to claim 2, characterized in that: When heating the liquid refrigerant and / or maintaining the temperature of the liquid refrigerant unchanged according to the opening and closing state of the solenoid valve, the controller is configured as follows: When the air conditioner is in heating operation, determining whether a liquid backflow fault occurs in the air conditioner; If yes, all the high-temperature and high-pressure gas from the compressor is introduced into the gas-liquid separator to heat the liquid refrigerant; Otherwise, a preset volume of high-temperature and high-pressure gas from the compressor is introduced into the gas-liquid separator to heat the liquid refrigerant.

8. The air conditioner according to claim 7, characterized in that: When heating the liquid refrigerant and / or maintaining the temperature of the liquid refrigerant unchanged according to the opening and closing state of the solenoid valve, the controller is further configured to: When the air conditioner is in heating operation at ultra-low temperature conditions, a preset volume of high-temperature and high-pressure gas from the compressor is introduced into the gas-liquid separator to heat the liquid refrigerant.

9. The air conditioner according to claim 1, characterized in that: When heating the liquid refrigerant and / or maintaining the temperature of the liquid refrigerant unchanged according to the opening and closing state of the solenoid valve, the controller is configured as follows: When the air conditioner is in defrosting operation, the indoor fan is controlled to stop rotating, and a preset volume of high-temperature and high-pressure gas from the compressor is introduced into the gas-liquid separator to heat the liquid refrigerant.

10. A liquid impact prevention control method for an air conditioner, characterized in that: include: determining an operating mode of the air conditioner; Controlling the opening and closing state of the solenoid valve according to the operating mode of the air conditioner; The liquid refrigerant is heated and / or the temperature of the liquid refrigerant is kept constant according to the opening and closing state of the solenoid valve.

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