Air conditioning device

Abstract

The application discloses an air conditioner device, which is characterized in that a gas-liquid separation device is arranged between an outdoor heat exchanger and an indoor expansion valve, a first interface of the gas-liquid separation device is connected to the outdoor heat exchanger, a second interface is connected to the indoor expansion valve, a third interface is connected to a gas pipe of a refrigerant circulation loop through a switch device, and a detection device is arranged to detect the state of the refrigerant at the second interface; in a refrigeration mode, when the second interface is not liquid refrigerant, the indoor expansion valve is closed and the switch device is opened; when the second interface is liquid refrigerant, the indoor expansion valve is opened; the air conditioner device separates the gaseous refrigerant and the liquid refrigerant before the indoor expansion valve through the gas-liquid separation device, only allows the liquid refrigerant to enter the indoor, avoids the non-liquid refrigerant from entering the indoor, and avoids the indoor unit from generating refrigerant flow noise.

Description

Technical Field

[0001] This invention relates to the field of air conditioning system technology, and in particular to an air conditioning device that can reduce the noise of refrigerant flow in the indoor unit. Background Technology

[0002] During the cooling operation of an air conditioning system, liquid refrigerant passes through the electronic expansion valve and enters the evaporator for evaporation and heat exchange. However, due to differences in environmental conditions in different areas, variations in refrigerant charge during construction, or insufficient heat exchange when the machine is first started, the refrigerant flowing into the indoor electronic expansion valve in cooling mode may be in the gas phase or a two-phase gas-liquid mixture. This can produce a noticeable refrigerant flow noise after the indoor electronic expansion valve is throttled, leading to user complaints.

[0003] In addition, due to changes in environmental conditions, refrigerant charge, and differences in unit capacity, there may be air bubbles in the refrigerant flowing from the outdoor unit to the front of the electronic expansion valve of the indoor unit. These air bubbles will radiate noise as they flow through the electronic expansion valve and heat exchanger.

[0004] To reduce refrigerant noise in indoor units, current technology typically increases the subcooling of the refrigerant entering the electronic expansion valve. This method can improve the refrigerant state entering the electronic expansion valve and has some effect on reducing refrigerant noise. However, it cannot completely eliminate noise, especially bubble noise.

[0005] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0006] This invention proposes an air conditioning device that solves the technical problem of noise from indoor refrigerant flow in existing air conditioning devices.

[0007] To achieve the above-mentioned objectives, the present invention employs the following technical solution: An air conditioning unit, comprising: The refrigerant circulation loop includes the compressor, four-way valve, outdoor heat exchanger, indoor expansion valve, and indoor heat exchanger. Gas-liquid separation device; The gas-liquid separation device includes: The first interface is connected to the outdoor heat exchanger; The second interface is connected to the indoor expansion valve; The third interface is connected to the gas pipe of the refrigerant circulation loop via a switching device, and the third interface is located above the second interface; The detection device is used to detect the refrigerant status at the second interface; In cooling mode, when the second interface uses non-liquid refrigerant, the indoor expansion valve is closed and the switching device is open; when the second interface uses liquid refrigerant, the indoor expansion valve is open.

[0008] The above technical solution has the following advantages or beneficial effects: The air conditioning unit is equipped with a gas-liquid separation device between the outdoor heat exchanger and the indoor expansion valve. The first interface of the gas-liquid separation device is connected to the outdoor heat exchanger, the second interface is connected to the indoor expansion valve, and the third interface is connected to the gas pipe of the refrigerant circulation loop through a switching device. The refrigerant state at the second interface is detected by a detection device. In cooling mode, when the refrigerant at the second interface is non-liquid, the indoor expansion valve is closed and the switching device is open. When the refrigerant at the second interface is liquid, the indoor expansion valve is open. The air conditioning unit separates the gaseous refrigerant and liquid refrigerant before the indoor expansion valve through the gas-liquid separation device, allowing only liquid refrigerant to enter the room and preventing non-liquid refrigerant from entering the room, thus avoiding refrigerant flow noise generated by the indoor unit.

[0009] In some embodiments, the detection device is a liquid level detection device, which is used to detect the liquid level in the gas-liquid separation device; When the liquid level is below a certain height, the indoor expansion valve closes and the switching device opens; The indoor expansion valve opens when the liquid level is above a certain height; The specific height is greater than or equal to the height of the second interface.

[0010] The above technical solution has the following advantages or beneficial effects: the liquid level detection device is easy to implement. When the liquid level is below a certain height, the second interface is for non-liquid refrigerant, the control room expansion valve is closed, and the switch device is opened to prevent non-liquid refrigerant from entering the room and to discharge gaseous refrigerant to the gas pipe. When the liquid level is above a certain height, the second interface is for liquid refrigerant, the room expansion valve is opened, and liquid refrigerant enters the room, which can prevent the indoor unit from generating refrigerant flow noise.

[0011] In some embodiments, the compressor speed is increased when the liquid level is below a certain height.

[0012] The above technical solution has the following advantages or beneficial effects: when the liquid level is below a certain height, the compressor speed is increased so that the rate at which the liquid refrigerant enters the gas-liquid separation device is accelerated, so that the liquid level reaches the certain height as soon as possible and the refrigerant enters the indoor unit for cooling as soon as possible.

[0013] In some embodiments, the rate or magnitude of increase in compressor speed is positively correlated with the height difference between the specific height and the liquid level.

[0014] The above technical solution has the following advantages or beneficial effects: the rate or magnitude of the increase in compressor speed is positively correlated with the height difference between a specific height and the liquid level, which can increase the rate at which liquid refrigerant enters the gas-liquid separation device.

[0015] In some embodiments, the indoor expansion valve opens when the liquid level is above a certain height, and the opening degree of the indoor expansion valve is controlled by the superheat of the indoor unit.

[0016] The above technical solution has the following advantages or beneficial effects: the opening of the indoor expansion valve is controlled by the indoor superheat to ensure the indoor cooling effect.

[0017] In some embodiments, the air conditioning unit has a target superheat range for the indoor unit, and the air conditioning unit includes: Tracheal temperature detection module, used to detect tracheal temperature; Liquid tube temperature detection module, used to detect the temperature of the liquid tube; The controller is used to calculate the superheat of the indoor unit based on the gas pipe temperature and liquid pipe temperature. When the superheat of the indoor unit is lower than the lower limit of the target superheat range, the opening of the indoor expansion valve is reduced. When the superheat of the indoor unit is higher than the upper limit of the target superheat range, the opening of the indoor expansion valve is increased.

[0018] The above technical solution has the following advantages or beneficial effects: by adjusting the opening of the indoor expansion valve, the superheat of the indoor unit is ensured to be within the target superheat range, thus ensuring the indoor cooling effect.

[0019] In some embodiments, the compressor speed is reduced when the liquid level is higher than a certain height setting.

[0020] The above technical solution has the following advantages or beneficial effects: when the liquid level is higher than the set height, it indicates that there is sufficient liquid refrigerant in the gas-liquid separation device, which can reduce the compressor speed and ensure that enough liquid refrigerant enters the room to ensure the cooling effect. Reducing the compressor speed can save energy.

[0021] In some embodiments, the rate or magnitude of decrease in the compressor speed is positively correlated with the height difference between the liquid level and a specific height.

[0022] The above technical solution has the following advantages or beneficial effects: the rate or magnitude of the decrease in compressor speed is positively correlated with the height difference between the liquid level and a specific height. When the height difference between the liquid level and the specific height is large, the rate or magnitude of the decrease in compressor speed is large, so as to save more energy. When the height difference between the liquid level and the specific height is small, the rate or magnitude of the decrease in compressor speed is small, so as to ensure the indoor cooling effect while saving energy.

[0023] In some embodiments, when the liquid level is higher than a certain height setting, the opening of the indoor expansion valve is increased while still satisfying the indoor superheat requirement.

[0024] The above technical solution has the following advantages or beneficial effects: when the liquid level is higher than a certain set height, the opening of the indoor expansion valve is increased on the basis of satisfying the indoor superheat, so as to ensure the indoor cooling effect, reduce the liquid storage in the gas-liquid separation device, and ensure the refrigerant circulation volume of the refrigerant circulation system.

[0025] In some embodiments, when the second interface is a liquid refrigerant, the indoor expansion valve is open and the switching device is closed.

[0026] The above technical solution has the following advantages or beneficial effects: when the second interface is liquid refrigerant, the indoor expansion valve is opened and the switching device is closed to ensure that a small amount of liquid refrigerant is stored in the gas-liquid separation device, allowing more refrigerant to participate in the refrigerant cycle and improve refrigeration efficiency.

[0027] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram showing the connection between the gas-liquid separation device and the refrigerant circulation loop according to an embodiment; Figure 2 This is a schematic diagram of a gas-liquid separation device according to an embodiment; Figure 3 This is a schematic diagram of a gas-liquid separation device according to another embodiment; Figure 4 This is a diagram of the refrigerant circulation system of an air conditioning unit according to an embodiment; Figure 5 This is a schematic block diagram of an air conditioning device according to an embodiment; Figure 6 This is a control flowchart of an air conditioning device according to an embodiment.

[0030] Figure 7 This is a schematic block diagram of an air conditioning device according to another embodiment; Figure 8-11 This is a control flowchart of an air conditioning device according to an embodiment.

[0031] In the picture: 1. Compressor; 2. Four-way valve; 3. Outdoor heat exchanger; 4. Indoor expansion valve; 5. Indoor heat exchanger; 6. Gas-liquid separation device; 61. First interface; 62. Second interface; 63. Third interface; 64. Refrigerant status detection device; 65. Liquid level detection device; 7. Switching device; 81. Liquid pipe temperature detection device; 82. Gas pipe temperature detection device; 9. Controller. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal conduction of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes or the use of other materials.

[0038] Air conditioning units execute a refrigeration cycle using a compressor, condenser, throttling device, and evaporator. The refrigeration cycle involves a series of processes, including compression, condensation, expansion, and evaporation, to cool or heat an indoor space.

[0039] Low-temperature, low-pressure refrigerant enters the compressor, which compresses it into a high-temperature, high-pressure refrigerant gas 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.

[0040] The throttling device expands the high-temperature, high-pressure liquid refrigerant that condenses in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the throttling device, returning the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioning unit regulates the temperature of the indoor space.

[0041] The outdoor unit of an air conditioning unit refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit of an air conditioning unit includes the indoor heat exchanger, and a throttling device can be provided in either the indoor or outdoor unit.

[0042] Indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger functions as a condenser, the air conditioning unit acts as a heater in heating mode; when the indoor heat exchanger functions as an evaporator, the air conditioning unit acts as a cooler in cooling mode.

[0043] An air conditioning unit includes a refrigerant circulation loop and adds a gas-liquid separator to the refrigerant circulation loop. The gas-liquid separator is located between the outdoor heat exchanger and the indoor expansion valve of the refrigerant circulation loop, and the gas outlet of the gas-liquid separator is connected to the gas pipe of the refrigerant circulation loop to separate the refrigerant entering the indoor expansion valve into gas and liquid. The gaseous refrigerant circulates directly to the gas pipe of the refrigerant circulation loop, while the liquid refrigerant enters the room, thus avoiding noise from the refrigerant flow in the room.

[0044] The air conditioning unit's gas-liquid separation device can further separate tiny bubbles, preventing the liquid refrigerant entering the room from containing bubbles and avoiding refrigerant noise caused by bubbles.

[0045] exist Figures 1-3 In the example, the refrigerant circulation loop includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a gas-liquid separator 6, an indoor expansion valve 4, and an indoor heat exchanger 5, all connected by pipes.

[0046] The gas-liquid separation device 6 includes a gas-liquid separation device body, a detection device, and a first interface 61, a second interface 62, and a third interface 63 located on the gas-liquid separation device body.

[0047] The gas-liquid separation device body has a gas-liquid separation function, including a gas-liquid separation chamber, and the first interface 61, the second interface 62 and the third interface 63 are all connected to the gas-liquid separation chamber.

[0048] The first interface 61 is connected to the outdoor heat exchanger 3. When the air conditioning unit is running in cooling mode, the refrigerant of the outdoor heat exchanger 3 enters the gas-liquid separation device 6 through the first interface 61.

[0049] The second interface 62 is connected to the indoor expansion valve 4.

[0050] The third interface 63 is connected to the gas pipe of the refrigerant circulation loop via the switching device 7.

[0051] In some embodiments, the switching device 7 is a solenoid valve, and the gas pipe is the pipeline between the indoor heat exchanger 5 and the compressor 1.

[0052] The second port 62 and the third port 63 are used to discharge the refrigerant from the gas-liquid separator 6.

[0053] The third interface 63 is located above the second interface 62.

[0054] The gaseous refrigerant in the gas-liquid separator 6 is located above the liquid refrigerant. Therefore, the purpose of the second interface 62 is to discharge the liquid refrigerant in the gas-liquid separator 6; the purpose of the third interface 63 is to discharge the gaseous refrigerant in the gas-liquid separator 6.

[0055] The liquid refrigerant in the gas-liquid separator 6 is discharged through the second port 62 and the gaseous refrigerant in the third port 63 by controlling the indoor expansion valve 4 and the switching device 7.

[0056] The detection device is used to detect the refrigerant status at the second interface 62.

[0057] In cooling mode, when the second interface 62 is filled with non-liquid refrigerant, the indoor expansion valve 4 is closed and the switch device 7 is open; when the second interface 62 is filled with liquid refrigerant, the indoor expansion valve 4 is open.

[0058] The air conditioning unit has a gas-liquid separator 6 installed between the outdoor heat exchanger 3 and the indoor expansion valve 4. The first port 61 of the gas-liquid separator 6 is connected to the outdoor heat exchanger 3, the second port 62 is connected to the indoor expansion valve 4, and the third port 63 is connected to the gas pipe of the refrigerant circulation loop through the switching device 7. The refrigerant state at the second port 62 is detected by the detection device. In the cooling mode, when the refrigerant at the second port 62 is non-liquid, the indoor expansion valve 4 is closed and the switching device 7 is open. When the refrigerant at the second port 62 is liquid, the indoor expansion valve 4 is open. The air conditioning unit separates the gaseous refrigerant from the liquid refrigerant before the indoor expansion valve 4 through the gas-liquid separator 6, allowing only liquid refrigerant to enter the room and preventing non-liquid refrigerant from entering the room, thus avoiding refrigerant flow noise generated by the indoor unit.

[0059] In some embodiments, when the second interface 62 is a liquid refrigerant, the indoor expansion valve 4 is open and the switching device 7 is closed.

[0060] When the second interface 62 contains liquid refrigerant, the indoor expansion valve 4 is opened and the switching device 7 is closed to ensure that a small amount of liquid refrigerant is stored in the gas-liquid separation device 6, allowing more refrigerant to participate in the refrigerant cycle and improve refrigeration efficiency.

[0061] exist Figure 2 , Figure 5 In this example, the detection device is a refrigerant status detection device 64 installed at the second interface 62.

[0062] In some embodiments, the refrigerant state detection device 64 is a capacitance detection device disposed at both ends of the inner diameter of the second interface 62.

[0063] In some embodiments, the refrigerant state detection device 64 is a light emitting and light receiving device disposed at both ends of the inner diameter of the second interface 62.

[0064] The air conditioning unit is equipped with a controller 9, which is configured to receive the refrigerant status at the second interface 62 position detected by the refrigerant status detection device 64 in the cooling mode. When the refrigerant status at the second interface 62 position detected by the refrigerant status detection device 64 is non-liquid refrigerant, the indoor expansion valve 4 is closed and the switch device 7 is opened; when the refrigerant status at the second interface 62 position detected by the refrigerant status detection device 64 is liquid refrigerant, the indoor expansion valve 4 is opened and the switch device 7 is closed.

[0065] exist Figure 6 In this example, the control method for the air conditioning unit is as follows: S1, refrigeration begins.

[0066] S2. The refrigerant status detection device detects the refrigerant status at the second interface.

[0067] S3. Determine if the refrigerant is in liquid state. If yes, proceed to step S4; otherwise, proceed to step S5.

[0068] S4. The indoor expansion valve opens, the switch device closes, and proceed to step S2.

[0069] S5. The indoor expansion valve is closed, the switch is opened, and the process proceeds to step S2.

[0070] exist Figure 3 , Figure 7 In this example, the detection device is a liquid level detection device 65, which is used to detect the liquid level inside the gas-liquid separation device 6.

[0071] When the liquid level is below a certain height, the indoor expansion valve 4 closes and the switching device 7 opens; When the liquid level is higher than a certain height, the indoor expansion valve 4 opens.

[0072] The specific height is greater than or equal to the height of the second interface.

[0073] The liquid level detection device 65 is easier to implement in practical applications.

[0074] When the liquid level is below a certain height, the second interface 62 is for non-liquid refrigerant, the control room expansion valve 4 is closed, and the switch device 7 is opened to prevent non-liquid refrigerant from entering the room and to discharge gaseous refrigerant to the gas pipe. When the liquid level is above a certain height, the second interface 62 is for liquid refrigerant, the control room expansion valve 4 is opened, and liquid refrigerant enters the room, which can prevent the indoor unit from generating refrigerant flow noise.

[0075] In some embodiments, the specific height is the top height of the second interface 62.

[0076] In some embodiments, the specific height is slightly higher than the top of the second interface 62 to ensure that liquid refrigerant enters the room.

[0077] In some embodiments, the level detection device 65 is a float switch located at a specific height.

[0078] The indoor expansion valve 4 and the switching device 7 are directly linked to the float switch. When the liquid level has not reached the float switch position, the indoor expansion valve 4 is closed and the switching device 7 is open; when the liquid level reaches the float switch position, the float switch is activated, the indoor expansion valve 4 is opened and the switching device 7 is closed.

[0079] In some embodiments, the liquid level detection device 65 is a liquid level sensor located within the gas-liquid separation device 6.

[0080] The air conditioning unit is equipped with a controller 9, which is configured to receive the liquid refrigerant level in the gas-liquid separator 6 detected by the liquid level detection device 65 when in cooling mode. When the liquid refrigerant level in the gas-liquid separator 6 detected by the liquid level detection device 65 has not reached a specific height, the indoor expansion valve 4 is closed and the switch device 7 is opened; when the liquid refrigerant level in the gas-liquid separator 6 detected by the liquid level detection device 65 reaches a specific height, the indoor expansion valve 4 is opened and the switch device 7 is closed.

[0081] exist Figure 8 In this example, the control method for the air conditioning unit is as follows: S1, refrigeration begins.

[0082] S2. The liquid level detection device detects the liquid refrigerant level in the gas-liquid separator.

[0083] S3. Determine whether the liquid refrigerant level has reached a specific height. If yes, proceed to step S4; otherwise, proceed to step S5.

[0084] S4. The indoor expansion valve opens, the switch device closes, and proceed to step S2.

[0085] S5. The indoor expansion valve is closed, the switch is opened, and the process proceeds to step S2.

[0086] In some embodiments, the liquid level detection device 65 is a capacitance detection device located at a specific height within the gas-liquid separation device.

[0087] In some embodiments, the liquid level detection device 65 is a light emitting and light receiving device located at a specific height within the gas-liquid separation device.

[0088] In some embodiments, when the liquid level detected by the liquid level detection device 65 is lower than a certain height, the rotational speed of the compressor 1 is increased.

[0089] When the liquid level detected by the liquid level detection device 65 is lower than a certain height, the speed of the compressor 1 is increased to accelerate the rate at which the liquid refrigerant enters the gas-liquid separator 6, so that the liquid level in the gas-liquid separator 6 can reach the certain height as soon as possible, so that the refrigerant can enter the indoor unit for cooling as soon as possible.

[0090] In some embodiments, the rate or magnitude of increase in compressor speed 1 is positively correlated with the height difference between a specific height and the liquid level.

[0091] The rate or magnitude of the increase in compressor speed 1 is positively correlated with the height difference between a specific height and the liquid level, which can increase the rate at which liquid refrigerant enters the gas-liquid separator 6.

[0092] In some embodiments, when the liquid level is higher than a certain height, the indoor expansion valve 4 opens and the switching device 7 closes, and the opening degree of the indoor expansion valve 4 is controlled by the superheat of the indoor unit.

[0093] The opening degree of the indoor expansion valve 4 is controlled by the indoor superheat to ensure the indoor cooling effect.

[0094] exist Figure 9 In this example, the control method for the air conditioning unit is as follows: S1, refrigeration begins.

[0095] S2. The liquid level detection device detects the liquid refrigerant level in the gas-liquid separator.

[0096] S3. Determine whether the liquid refrigerant level has reached a specific height. If yes, proceed to step S4; otherwise, proceed to step S5.

[0097] S4. The indoor expansion valve opens and the switching device closes. The opening degree of the indoor expansion valve 4 is controlled by the superheat of the indoor unit. Proceed to step S2.

[0098] S5. The indoor expansion valve is closed, the switching device is opened, the speed of compressor 1 is increased, and the process proceeds to step S2.

[0099] In some embodiments, when the liquid level is higher than a certain height setting, the speed of compressor 1 is reduced.

[0100] When the liquid level is higher than the set height, it indicates that there is sufficient liquid refrigerant in the gas-liquid separation device 6. This allows the compressor 1 to be rotated at a lower speed, while also ensuring that enough liquid refrigerant enters the room to maintain the cooling effect. Reducing the compressor 1's speed can also save energy.

[0101] In some embodiments, the rate or magnitude of decrease in compressor speed 1 is positively correlated with the height difference between the liquid level and a specific height.

[0102] The rate or magnitude of the decrease in compressor speed is positively correlated with the height difference between the liquid level and the specific height. When the height difference between the liquid level and the specific height is large, the rate or magnitude of the decrease in compressor speed is large, so as to save more energy. When the height difference between the liquid level and the specific height is small, the rate or magnitude of the decrease in compressor speed is small, so as to ensure the indoor cooling effect while saving energy.

[0103] In some embodiments, when the liquid level is higher than a certain height setting, the opening of the indoor expansion valve 4 is increased based on meeting the indoor superheat requirement.

[0104] When the liquid level is higher than a specific height setting, the opening of the indoor expansion valve 4 is increased while meeting the indoor superheat requirement, in order to ensure the indoor cooling effect, reduce the liquid retention in the gas-liquid separation device 6, and ensure the refrigerant circulation volume of the refrigerant circulation system.

[0105] exist Figure 10 In this example, the control method for the air conditioning unit is as follows: S1, refrigeration begins.

[0106] S2. The liquid level detection device detects the liquid refrigerant level in the gas-liquid separator.

[0107] S3. Determine whether the liquid refrigerant level has reached a specific height. If yes, proceed to step S4; otherwise, proceed to step S7.

[0108] S4. Determine whether the liquid refrigerant level is higher than the set height. If yes, proceed to step S5; otherwise, proceed to step S6.

[0109] S5. The compressor speed is reduced, and the opening of the indoor expansion valve 4 is increased while still meeting the indoor superheat requirement. Proceed to step S2.

[0110] S6. The indoor expansion valve opens and the switching device closes. The opening degree of the indoor expansion valve 4 is controlled by the superheat of the indoor unit. Proceed to step S2.

[0111] S7. The indoor expansion valve is closed, the switching device is opened, the speed of compressor 1 is increased, and the process proceeds to step S2.

[0112] In some embodiments, the air conditioning unit has a target superheat range for the indoor unit, and the air conditioning unit includes: Tracheal temperature detection device 82, used to detect tracheal temperature; Liquid tube temperature detection device 81, used to detect the temperature of the liquid tube; The controller is used to calculate the superheat of the indoor unit based on the gas pipe temperature and liquid pipe temperature. When the superheat of the indoor unit is lower than the lower limit of the target superheat range, the opening of the indoor expansion valve is reduced. When the superheat of the indoor unit is higher than the upper limit of the target superheat range, the opening of the indoor expansion valve is increased.

[0113] By adjusting the opening of the indoor expansion valve, the superheat of the indoor unit is kept within the target superheat range, thus ensuring the indoor cooling effect.

[0114] exist Figure 11 In this example, the control method for the air conditioner is as follows: S1, refrigeration begins.

[0115] S2, Indoor expansion valve closed.

[0116] S3. Detect the liquid level. Proceed to step S4, S7, or S12.

[0117] S4, The liquid level is below a certain height.

[0118] S5, the switch is turned on.

[0119] S6. The compressor speed increases. After a specific time, proceed to step S3.

[0120] S7, Liquid level is within the set height range.

[0121] S8. Indoor expansion valve open, switch device closed.

[0122] S9. Detect indoor overheating.

[0123] S10. If the indoor superheat is within the target range, proceed to step S3; otherwise, proceed to step S11.

[0124] S11. Adjust the opening of the indoor expansion valve and proceed to step S9.

[0125] S12, Liquid level exceeds the set height.

[0126] S13. Increase the opening degree of the indoor expansion valve.

[0127] S13, Compressor speed decreases. After a specific time, proceed to step S3.

[0128] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0129] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An air conditioning unit, comprising: The refrigerant circulation loop includes the compressor, four-way valve, outdoor heat exchanger, indoor expansion valve, and indoor heat exchanger. Gas-liquid separation device; Its features are, The gas-liquid separation device includes: The first interface is connected to the outdoor heat exchanger; The second interface is connected to the indoor expansion valve; The third interface is connected to the gas pipe of the refrigerant circulation loop via a switching device. The third interface is located above the second interface. The detection device is used to detect the refrigerant status at the second interface; In cooling mode, when the second interface uses non-liquid refrigerant, the indoor expansion valve is closed and the switching device is open; when the second interface uses liquid refrigerant, the indoor expansion valve is open.

2. The air conditioning device according to claim 1, characterized in that, The detection device is a liquid level detection device, which is used to detect the liquid level in the gas-liquid separation device. When the liquid level is below a certain height, the indoor expansion valve closes and the switching device opens; The indoor expansion valve opens when the liquid level is above a certain height; The specific height is greater than or equal to the height of the second interface.

3. The air conditioning device according to claim 2, characterized in that, Increase compressor speed when the liquid level is below a certain height.

4. The air conditioning device according to claim 3, characterized in that, The rate or magnitude of increase in the compressor speed is positively correlated with the height difference between the specific height and the liquid level.

5. The air conditioning device according to claim 2, characterized in that, When the liquid level is higher than a certain height, the indoor expansion valve opens, and the opening degree of the indoor expansion valve is controlled by the superheat of the indoor unit.

6. The air conditioning device according to claim 5, characterized in that, The air conditioning unit has a target superheat range for the indoor unit, and the air conditioning unit includes: Tracheal temperature detection module, used to detect tracheal temperature; Liquid tube temperature detection module, used to detect the temperature of the liquid tube; The controller is used to calculate the superheat of the indoor unit based on the gas pipe temperature and liquid pipe temperature. When the superheat of the indoor unit is lower than the lower limit of the target superheat range, the opening of the indoor expansion valve is reduced. When the superheat of the indoor unit is higher than the upper limit of the target superheat range, the opening of the indoor expansion valve is increased.

7. The air conditioning device according to claim 2, characterized in that, When the liquid level is higher than a specific height setting, reduce the compressor speed.

8. The air conditioning device according to claim 7, characterized in that, The rate of decrease in compressor speed is positively correlated with the difference between the liquid level and a specific height.

9. The air conditioning device according to claim 6, characterized in that, When the liquid level is higher than a specific height setting, the opening of the indoor expansion valve is increased while still meeting the indoor superheat requirement.

10. The air conditioning device according to any one of claims 1-9, characterized in that, When the second interface is filled with liquid refrigerant, the indoor expansion valve is open and the switching device is closed.

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