Air conditioning system

Abstract

The utility model discloses an air conditioning system which comprises a condenser, an evaporator, a four-way reversing valve and a throttling device. The system further comprises at least two compressors, and an exhaust port of any compressor is connected with the four-way reversing valve. The gas-liquid separation device comprises a first sub-gas-liquid separator, a first containing cavity is formed in the first sub-gas-liquid separator, the first sub-gas-liquid separator comprises a gas inlet pipe and at least two gas outlet pipes, the gas inlet pipe is connected with the four-way reversing valve through a first pipeline, and the at least two gas outlet pipes are correspondingly connected with gas suction ports of the at least two compressors; a second accommodating cavity is formed in the second sub gas-liquid separator; the oil balancing pipe is configured to be communicated with the first containing cavity and the second containing cavity so as to balance the oil storage amount between the first containing cavity and the second containing cavity; and the pressure equalizing pipe is configured to be communicated with the first accommodating cavity and the second accommodating cavity so as to balance the air pressure between the first accommodating cavity and the second accommodating cavity. According to the scheme, the problem that oil quantity distribution of double gas-liquid separators is not uniform can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to an air conditioning system. Background Art

[0002] As the capacity of individual outdoor units in multi-split systems increases, along with the capacity of compressors and the overall refrigerant charge, the capacity requirements for the gas-liquid separators are also increasing. This technical issue is generally addressed through the design of dual or multiple gas-liquid separators. For example, with dual compressors and dual gas-liquid separators, while the two gas-liquid separators are designed to be identical, manufacturing errors, differing specifications such as the length of the front and rear pipes of the gas-liquid separators, and the distribution and diversion of the gas-liquid phase result in inconsistent flow rates of oil and refrigerant entering the two gas-liquid separators. The two compressors draw oil and refrigerant from the two gas-liquid separators, respectively, potentially leading to an oil bias in the compressors.

[0003] In order to solve the above technical problems, refer to Figure 1 and Figure 2 , Figure 1 This is a structural diagram of a gas-liquid separator. Figure 2 This is a schematic diagram of an air conditioning system. The air conditioning system includes two compressors 1, two gas-liquid separators 01, a condenser 3, an evaporator 4, a four-way reversing valve 2, an oil separator 6, a throttling device 5, etc. The gas-liquid separator 01 includes a refrigerant inlet pipe 02 and a refrigerant outlet pipe 03. The refrigerant outlet pipe 03 is a U-shaped pipe with an upper oil return hole, a lower oil return hole, and a pressure equalization hole. The two compressors 1 are connected to the two gas-liquid separators 01. A pressure equalization pipe 04 and an oil equalization pipe 05 are provided between the two gas-liquid separators 01 to achieve pressure and liquid equalization. When the evaporator 4 returns liquid, the refrigerant returning from the S end of the four-way reversing valve 2 is a two-phase gas-liquid phase. When it is distributed to the two gas-liquid separators 01, the distribution is uneven, resulting in different oil concentrations entering the two gas-liquid separators 01, and ultimately resulting in different oil return volumes from the two compressors 1.

[0004] The above information disclosed in this background technology is only used to increase the understanding of the background technology of this application. Therefore, it may contain information that does not constitute the prior art known to ordinary technicians in this field. Summary of the Invention

[0005] In view of the problems pointed out in the background technology, the present invention proposes an air conditioning system to solve the problem of uneven oil distribution in double gas-liquid separators.

[0006] In order to achieve the above-mentioned purpose of the utility model, the utility model adopts the following technical solutions:

[0007] In some embodiments of the present application, an air-conditioning system is provided, comprising a condenser, an evaporator, a four-way reversing valve and a throttling device; further comprising at least two compressors, the exhaust port of any compressor being connected to the four-way reversing valve; a gas-liquid separation device comprising a first sub-gas-liquid separator, wherein a first cavity is formed inside, the first sub-gas-liquid separator comprising an air inlet pipe and at least two air outlet pipes, the air inlet pipe being connected to the four-way reversing valve through a first pipeline, and the at least two air outlet pipes being correspondingly connected to the air intakes of at least two compressors; a second sub-gas-liquid separator, wherein a second cavity is formed inside; an oil equalizing pipe being configured to connect the first cavity and the second cavity to balance the oil storage amount between the first cavity and the second cavity; a pressure equalizing pipe being configured to connect the first cavity and the second cavity to balance the air pressure between the first cavity and the second cavity.

[0008] The above technical solution has the following advantages or beneficial effects: the gas-liquid separation device includes a first sub-gas-liquid separator and a second sub-gas-liquid separator, and oil balance is achieved between the first sub-gas-liquid separator and the second sub-gas-liquid separator through an oil equalizing pipe, and gas balance is achieved through a pressure equalizing pipe. The air intakes of the two compressors are connected to the corresponding air outlet pipes on the first sub-gas-liquid separator through pipelines. The refrigerant circulating in the air-conditioning system returns to the first sub-gas-liquid separator through the same air inlet pipe. In this way, the gas-liquid separation device can not only expand the capacity of the air-conditioning system, but also ensure that the return oil volume of the two compressors is uniform, thereby avoiding the problem of oil bias in the compressors.

[0009] In some embodiments of the present application, any of the outlet pipes is provided with a pressure equalizing hole and multiple oil return holes, the multiple oil return holes are spaced apart along the height direction of the first cavity, and the pressure equalizing pipe is provided at a position higher than the air inlet end of the outlet pipe.

[0010] Another technical solution among the above technical solutions has the following advantages or beneficial effects: the pressure equalizing tube is positioned higher than the air inlet end of the air outlet pipe, thereby ensuring air balance between the first and second chambers. If the pressure equalizing tube is positioned higher than the air inlet end of the air outlet pipe, then when there is an air pressure imbalance between the first and second chambers, the pressure equalizing tube may be lower than the liquid level, making it impossible to achieve air balance between the first and second chambers.

[0011] In some embodiments of the present application, the oil balancing pipe is disposed at a position lower than the oil return hole located at a lower position.

[0012] Another technical solution among the above technical solutions has the following advantages or beneficial effects: the oil balancing pipe is set at a position lower than the oil return hole located at a lower position, ensuring the balance of the liquid level between the first and second chambers. If the oil balancing pipe is set at a position higher than the second oil return hole, the liquid level in the second chamber may be higher than the liquid level in the first chamber, and the oil balance between the first and second chambers cannot be achieved.

[0013] In some embodiments of the present application, a first on-off valve is provided on the oil equalizing pipe, and a second on-off valve is provided on the pressure equalizing pipe.

[0014] Another technical solution among the above technical solutions has the following advantages or beneficial effects: a first on-off valve is provided on the oil balancing pipe, and the first on-off valve is configured to control the opening or closing of the oil balancing pipe. For example, the first on-off valve is a solenoid valve.

[0015] The pressure equalizing pipe is provided with a second on-off valve, which is configured to control the opening or closing of the pressure equalizing pipe. For example, the second on-off valve is a solenoid valve.

[0016] A liquid level sensor is disposed within the first chamber and is configured to detect the liquid level within the first chamber. When the liquid level sensor detects that the liquid level within the first chamber is lower than the second oil return hole, indicating a low oil reserve within the first chamber, the first and second on-off valves close, isolating the first and second chambers. As the air conditioning system continues to operate, the liquid level within the first chamber gradually rises, maintaining the liquid level between the first and second oil return holes. A certain amount of oil is stored within the first chamber, preventing insufficient oil return from the compressor.

[0017] When the liquid level sensor detects that the liquid level in the first chamber is higher than the first oil return hole, the oil storage amount in the first chamber is large, the first on-off valve and the second on-off valve are closed, the first chamber is connected to the second chamber, and the oil in the first chamber flows into the second chamber through the oil equalizing pipe, thereby avoiding excessive oil return from the compressor.

[0018] In some embodiments of the present application, the air-conditioning system also includes multiple oil separators, and the oil separators are provided on the connecting pipeline between the exhaust port of any compressor and the four-way reversing valve; the air-conditioning system also includes multiple oil return branches, and the multiple oil return branches are correspondingly connected to the multiple oil separators, and the first end of any oil return branch is connected to the first pipeline, and the second end is connected to the oil outlet of the corresponding oil separator.

[0019] Another technical solution among the above technical solutions has the following advantages or beneficial effects: multiple oil return branches are connected to the first pipeline, and the oil returning from the multiple oil return branches flows into the first cavity through the first pipeline and the intake pipe. Multiple compressors return oil from the first cavity in a unified manner, avoiding the problem of different return oil concentrations of multiple compressors.

[0020] In some embodiments of the present application, the air-conditioning system also includes an oil separator, which includes an inlet, a refrigerant outlet and an oil outlet. The exhaust ports of multiple compressors are connected to the inlet through pipelines, and the refrigerant outlet is connected to the four-way reversing valve through pipelines; the air-conditioning system also includes an oil return branch, the first end of the oil return branch is connected to the first pipeline, and the second end is connected to the oil outlet.

[0021] Another technical solution among the above technical solutions has the following advantages or beneficial effects: the refrigerants discharged from multiple compressors all flow through the same oil separator, and only one oil return branch is provided, thereby reducing structural costs.

[0022] In some embodiments of the present application, an air-conditioning system includes a condenser, an evaporator, a four-way reversing valve and a throttling device; and also includes: at least two compressors, the exhaust port of any compressor being connected to the four-way reversing valve; a gas-liquid separation device including: a first sub-gas-liquid separator, having a first cavity formed therein, the first sub-gas-liquid separator including at least two outlet pipes, the at least two outlet pipes being correspondingly connected to the intake ports of the at least two compressors; a second sub-gas-liquid separator, having a second cavity formed therein, the second sub-gas-liquid separator including an intake pipe, the intake pipe being connected to the four-way reversing valve; an oil equalizing pipe, configured to connect the first cavity and the second cavity to balance the oil storage amount between the first cavity and the second cavity; a pressure equalizing pipe, configured to connect the first cavity and the second cavity to balance the air pressure between the first cavity and the second cavity.

[0023] The above technical solution has the following advantages or beneficial effects: the gas-liquid separation device includes a first sub-gas-liquid separator and a second sub-gas-liquid separator, and oil balance is achieved between the first sub-gas-liquid separator and the second sub-gas-liquid separator through an oil equalizing pipe, and gas balance is achieved through a pressure equalizing pipe. The air intakes of the two compressors are connected to the corresponding air outlet pipes on the first sub-gas-liquid separator through pipelines. The refrigerant circulating in the air-conditioning system returns to the first sub-gas-liquid separator through the same air inlet pipe. The air inlet pipe is arranged on the second sub-gas-liquid separator to reduce the risk of liquid return from the compressor intake, and at the same time, the air-conditioning system can achieve fast oil return and good reliability during transitional working conditions.

[0024] In some embodiments of the present application, the air-conditioning system also includes multiple oil separators, and the oil separators are provided on the connecting pipeline between the exhaust port of any compressor and the four-way reversing valve; the air-conditioning system also includes multiple oil return branches, and the multiple oil return branches are correspondingly connected to the multiple oil separators, and the first end of any oil return branch is connected to the first sub-gas-liquid separator, and the second end is connected to the oil outlet of the corresponding oil separator.

[0025] Another technical solution among the above technical solutions has the following advantages or beneficial effects: the air inlet pipe is set on the second sub-gas-liquid separator, and the air outlet pipe and the oil inlet pipe are set on the first sub-gas-liquid separator. In this way, when the air inlet pipe returns liquid, the risk of air suction and liquid return of the compressor can be reduced.

[0026] In some embodiments of the present application, the air-conditioning system also includes an oil separator, which includes an inlet, a refrigerant outlet and an oil outlet. The exhaust ports of multiple compressors are connected to the inlet through pipelines, and the refrigerant outlet is connected to the four-way reversing valve through pipelines; the air-conditioning system also includes an oil return branch, the first end of the oil return branch is connected to the first sub-gas-liquid separator, and the second end is connected to the oil outlet.

[0027] Another technical solution among the above technical solutions has the following advantages or beneficial effects: the refrigerants discharged from multiple compressors all flow through the same oil separator, and only one oil return branch is provided, thereby reducing structural costs.

[0028] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0030] Figure 1 A structural diagram of a gas-liquid separator according to the prior art;

[0031] Figure 2 A schematic diagram of an air conditioning system according to the prior art;

[0032] Figure 3 is a structural diagram of a gas-liquid separation device according to some embodiments;

[0033] Figure 4 is another structural diagram of a gas-liquid separation device according to some embodiments;

[0034] Figure 5 is a schematic diagram of an air conditioning system according to some embodiments;

[0035] Figure 6 is another schematic diagram of an air conditioning system according to some embodiments;

[0036] Figure 7 is a structural diagram of a gas-liquid separation device according to some other embodiments;

[0037] Figure 8 is another structural diagram of a gas-liquid separation device according to other embodiments;

[0038] Figure 9is a schematic diagram of an air conditioning system according to some other embodiments;

[0039] Figure 10 is another schematic diagram of an air conditioning system according to other embodiments;

[0040] Figure 11 is a structural diagram of a first sub-gas-liquid separator according to some embodiments;

[0041] Reference numerals:

[0042] 1. Compressor; 2. Four-way reversing valve; 3. Condenser; 4. Evaporator; 5. Throttling device; 6. Oil separator; 7. First pipeline; 8. Oil return branch; 9. Throttling element;

[0043] 01. Gas-liquid separator; 02. Refrigerant inlet pipe; 03. Refrigerant outlet pipe; 04. Pressure-equalizing pipe; 05. Oil-equalizing pipe;

[0044] 100. Gas-liquid separation device;

[0045] 110. First sub-gas-liquid separator; 111. First cylinder; 112. First cavity;

[0046] 120. Second sub-gas-liquid separator; 121. Second cylinder; 122. Second chamber;

[0047] 130. Pressure equalizing pipe; 131. Second on-off valve;

[0048] 140. Oil equalizing pipe; 141. First on-off valve;

[0049] 150, intake pipe;

[0050] 160, air outlet pipe; 161, pressure equalizing hole; 162, first oil return hole; 163, second oil return hole; 164, first pipe section; 165, second pipe section; 166, third pipe section;

[0051] 170. Oil inlet pipe. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0053] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0054] 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 the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0055] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0056] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0057] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but a person of ordinary skill in the art will recognize the application of other processes and / or the use of other materials.

[0058] In some embodiments of the present application, an air conditioning system is provided that uses a compressor, a condenser, an expansion valve, and an evaporator to perform a refrigeration cycle. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat an indoor space.

[0059] Low-temperature, low-pressure refrigerant enters the compressor, which compresses it into 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, releasing heat into the surrounding environment through the condensation process.

[0060] The expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser to a lower-pressure liquid. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves cooling by utilizing the latent heat of evaporation to exchange heat with the material being cooled. Throughout this cycle, the air conditioner regulates the temperature of the indoor space.

[0061] 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.

[0062] 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 heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0063] In some embodiments of this application, refer to Figure 5 The air conditioning system includes a condenser 3. The air conditioning system also includes an evaporator 4. The air conditioning system also includes a four-way reversing valve 2. The four-way reversing valve 2 includes a C end, a D end, an E end, and an S end. The air conditioning system also includes a throttling device 5, etc.

[0064] The air conditioning system further comprises at least two compressors 1. The exhaust port of any compressor 1 is connected to the D end of the four-way reversing valve 2 through a pipeline.

[0065] The air-conditioning system also includes a gas-liquid separation device 100. The gas-liquid separation device 100 is used to expand the capacity of the air-conditioning system to improve the cooling effect or heating effect of the air-conditioning system. The gas-liquid separation device 100 is used to separate the gaseous refrigerant and the liquid refrigerant in the refrigerant flowing through the evaporator 4, and at the same time separate the lubricating oil carried by the refrigerant and store it in the gas-liquid separation device 100, and then the lubricating oil stored in the gas-liquid separation device 100 is transported to the compressor 1 along with the gaseous refrigerant through the oil return hole in the gas-liquid separation device 100 to lubricate the vortex part of the compressor 1, thereby avoiding abnormal wear of the compressor 1 due to insufficient oil supply, thereby causing a failure of the compressor 1 and affecting the life of the compressor 1.

[0066] In existing VRF systems, the capacity of individual outdoor units is increasing, as are compressor capacity and overall refrigerant charge, placing increasing demands on the capacity of the gas-liquid separator. This technical issue is typically addressed through the design of dual or multiple gas-liquid separators. For example, with dual compressors and dual gas-liquid separators, while the two gas-liquid separators are designed to be identical, manufacturing errors, differing specifications such as the length of the front and rear pipes of the gas-liquid separators, and the distribution and diversion of the gas-liquid phase lead to variations in the flow of oil and refrigerant entering the two gas-liquid separators. The two compressors draw oil and refrigerant from the two gas-liquid separators, respectively, potentially leading to an oil bias in the compressors.

[0067] Reference Figure 1 and Figure 2 , Figure 1 This is a structural diagram of the existing gas-liquid separator 01. Figure 2 This is a schematic diagram of an existing air-conditioning system. The air-conditioning system includes two compressors 1, two gas-liquid separators 01, a condenser 3, an evaporator 4, a four-way reversing valve 2, an oil separator 6, a throttling device 5, and the like. The gas-liquid separator 01 includes a refrigerant inlet pipe 02 and a refrigerant outlet pipe 03. The refrigerant outlet pipe 03 is a U-shaped pipe with an upper oil return hole, a lower oil return hole, and a pressure equalization hole. The two compressors 1 are connected to the two gas-liquid separators 01. A pressure equalization pipe 04 and an oil equalization pipe 05 are provided between the two gas-liquid separators 01 to achieve pressure and liquid equalization. When the evaporator 4 returns liquid, the refrigerant returning from the S end of the four-way reversing valve 2 is a two-phase gas-liquid phase. When distributed to the two gas-liquid separators 01, the distribution is uneven, resulting in different oil concentrations entering the two gas-liquid separators 01, and ultimately, different oil return volumes from the two compressors 1.

[0068] In order to solve this technical problem, in some embodiments of the present application, referring to Figure 3 and Figure 5The gas-liquid separation device 100 includes a first sub-gas-liquid separator 110 .

[0069] The first sub-gas-liquid separator 110 includes a first cylinder 111 , and a first cavity 112 is formed inside the first cylinder 111 .

[0070] The first sub-gas-liquid separator 110 further includes an air inlet pipe 150 , which is connected to the S end of the four-way reversing valve 2 through the first pipeline 7 .

[0071] The first sub-gas-liquid separator 110 further includes at least two gas outlet pipes 160 , and the at least two gas outlet pipes 160 are correspondingly connected to the air intakes of at least two compressors 1 . Figure 5 The air-conditioning system shown includes two compressors 1 and two air outlet pipes 160 , and the two compressors 1 are connected to the two air outlet pipes 160 correspondingly.

[0072] The gas-liquid separation device 100 further includes a second sub-gas-liquid separator 120 .

[0073] The second sub-separator includes a second cylinder 121 , and a second cavity 122 is formed in the second cylinder 121 .

[0074] The gas-liquid separation device 100 further includes an oil balancing pipe 140 . The oil balancing pipe 140 is connected between the first cylinder 111 and the second cylinder 121 and is configured to communicate with the first cavity 112 and the second cavity 122 to balance the oil storage between the first cavity 112 and the second cavity 122 .

[0075] The gas-liquid separation device 100 further includes a pressure equalizing pipe 130 . The pressure equalizing pipe 130 is connected between the first cylinder 111 and the second cylinder 121 and is configured to communicate with the first cavity 112 and the second cavity 122 to balance the gas pressure therebetween.

[0076] Reference Figure 5 Taking the air conditioning system as an example, the refrigerant discharged from the two compressors 1 flows through the D end and C end of the four-way reversing valve 2, the condenser 3, the throttling device 5, the evaporator 4 in sequence, and then through the E end and S end of the four-way reversing valve 2, the first pipeline 7, and the air inlet pipe 150 into the first cavity 112. The refrigerant undergoes gas-liquid separation in the first cavity 112, and the separated gaseous refrigerant returns to the compressor 1 through the air outlet pipe 160.

[0077] The gas-liquid separation device 100 includes a first sub-gas-liquid separator 110 and a second sub-gas-liquid separator 120. The oil balance is achieved between the first sub-gas-liquid separator 110 and the second sub-gas-liquid separator 120 through the oil equalizing pipe 140, and the gas balance is achieved through the pressure equalizing pipe 130. The air intakes of the two compressors 1 are connected to the corresponding air outlet pipes 160 on the first sub-gas-liquid separator 110 through pipelines. The refrigerant circulating in the air-conditioning system returns to the first sub-gas-liquid separator 110 through the same air inlet pipe 150. In this way, the gas-liquid separation device 100 can ensure that the return oil volume of the two compressors 1 is uniform while expanding the capacity of the air-conditioning system, thereby avoiding the problem of oil bias in the compressor 1.

[0078] In some embodiments of this application, refer to Figure 3 Any air outlet pipe 160 is provided with a pressure equalizing hole 161 and a plurality of oil return holes, and the plurality of oil return holes are arranged at intervals along the height direction of the first cavity 112 .

[0079] For example, the air outlet pipe 160 includes a first pipe section 164, a second pipe section 165, and a third pipe section 166. The first and second pipe sections 164, 165 extend along the height of the first cavity 112. The first end of the first pipe section 164 extends out of the first cavity 112, the first end of the second pipe section 165 is located within the first cavity 112, and the third pipe section 166 is connected between the second ends of the first and second pipe sections 164, 165.

[0080] For example, the upper end of the first pipe section 164 is its first end, and the lower end is its second end. The upper end of the second pipe section 165 is its first end, and the lower end is its second end.

[0081] The first pipe section 164 is provided with a pressure equalizing hole 161. The first pipe section 164 is provided with a pressure equalizing hole 161 at an upper position thereof.

[0082] The second pipe section 165 is provided with a first oil return hole 162. The third pipe section 166 is provided with a second oil return hole 163.

[0083] In some embodiments of the present application, the pressure equalizing tube 130 is positioned higher than the air inlet end of the air outlet pipe 160. That is, the pressure equalizing tube 130 is positioned higher than the upper end of the second pipe section 165. This ensures that the air in the first chamber 112 and the second chamber 122 are balanced.

[0084] If the setting position of the pressure equalizing tube 130 is higher than the air inlet end of the air outlet pipe 160, when the air pressure between the first chamber 112 and the second chamber 122 is unbalanced, the pressure equalizing tube 130 may be lower than the liquid level, and thus the air balance between the first chamber 112 and the second chamber 122 cannot be achieved.

[0085] In some embodiments of the present application, the oil balancing pipe 140 is positioned lower than the lower oil return hole. For example, the oil balancing pipe 140 is positioned lower than the second oil return hole 163. This ensures that the liquid level between the first and second cavities 112, 122 is balanced.

[0086] If the oil balancing pipe 140 is positioned higher than the second oil return hole 163 , the liquid level in the second chamber 122 may be higher than the liquid level in the first chamber 112 , and oil balance between the first and second chambers 112 , 122 cannot be achieved.

[0087] In some embodiments of the present application, a fixing plate (not shown) is provided in the first cavity 112 , and the first pipe section 164 and the second pipe section 165 of the air outlet pipe 160 are connected through the fixing plate to improve the installation stability of the air outlet pipe 160 .

[0088] In some embodiments of the present application, the second cavity 122 is empty.

[0089] In some embodiments of the present application, the first barrel 111 and the second barrel 121 have the same size and good versatility.

[0090] In some embodiments of the present application, the pressure-equalizing tube 130 is a U-shaped tube. The pressure-equalizing tube 130 includes a first pressure-equalizing tube, a second pressure-equalizing tube, and a third pressure-equalizing tube. The third pressure-equalizing tube is connected between the first and second pressure-equalizing tubes. One end of the first pressure-equalizing tube is connected to the circumferential wall of the first cylinder 111, and one end of the second pressure-equalizing tube is connected to the circumferential wall of the second cylinder 121. The third pressure-equalizing tube is located outside the circumferential walls of the first and second cylinders 111, 121.

[0091] The pressure-equalizing tube 130 is a U-shaped tube with high structural strength. It is installed on the circumferential walls of the first and second barrels 111, 121, facilitating installation. The third pressure-equalizing tube is located outside the circumferential walls of the first and second barrels 111, 121, allowing them to be positioned close together, resulting in a compact structure.

[0092] In some embodiments of the present application, the pressure-equalizing tube 130 is a U-shaped tube. The pressure-equalizing tube 130 includes a first pressure-equalizing tube, a second pressure-equalizing tube, and a third pressure-equalizing tube. The third pressure-equalizing tube is connected between the first and second pressure-equalizing tubes. One end of the first pressure-equalizing tube is connected to the top wall of the first cylinder 111, and one end of the second pressure-equalizing tube is connected to the top wall of the second cylinder 121. The third pressure-equalizing tube is located at the top of the first and second cylinders 111, 121.

[0093] The pressure-equalizing tube 130 is a U-shaped tube with high structural strength. It is installed on top of the first and second cylinders 111, 121, for easy installation. The third pressure-equalizing tube is located on top of the first and second cylinders 111, 121, allowing them to be placed close together, resulting in a compact structure.

[0094] In some embodiments of the present application, the oil balancing pipe 140 is a U-shaped pipe comprising a first oil balancing pipe, a second oil balancing pipe, and a third oil balancing pipe, with the third oil balancing pipe being connected between the first and second oil balancing pipes. One end of the first oil balancing pipe is connected to the circumferential wall of the first cylinder 111, one end of the second oil balancing pipe is connected to the circumferential wall of the second cylinder 121, and the third oil balancing pipe is located outside the circumferential walls of the first and second cylinders 111, 121.

[0095] The oil equalizing pipe 140 is a U-shaped pipe with high structural strength. It is installed on the circumferential walls of the first and second cylinders 111, 121, facilitating installation. The third oil equalizing pipe is located outside the circumferential walls of the first and second cylinders 111, 121, allowing them to be positioned close together, resulting in a compact structure.

[0096] In some embodiments of the present application, two air outlet pipes 160 are arranged in parallel. Figure 11 In this way, the two air outlet pipes 160 are compactly arranged in the first cavity 112 .

[0097] The air inlet pipe 150 is disposed between the two air outlet pipes 160 , making full use of the space between the two air outlet pipes 160 .

[0098] In some embodiments of the present application, filters are provided at the first oil return hole 162 and the second oil return hole 163 to prevent impurities from entering the air-conditioning system.

[0099] In some embodiments of this application, refer to Figure 4 The oil balancing pipe 140 is provided with a first on-off valve 141, and the first on-off valve 141 is configured to control the opening or closing of the oil balancing pipe 140. For example, the first on-off valve 141 is a solenoid valve.

[0100] The pressure equalizing tube 130 is provided with a second on-off valve 131, and the second on-off valve 131 is configured to control the opening or closing of the pressure equalizing tube 130. For example, the second on-off valve 131 is a solenoid valve.

[0101] A liquid level sensor is disposed in the first cavity 112 , and the liquid level sensor is configured to detect the liquid level in the first cavity 112 .

[0102] When the liquid level sensor detects that the liquid level in the first cavity 112 is lower than the second oil return hole 163, the oil storage amount in the first cavity 112 is small, the first on-off valve 141 and the second on-off valve 131 are closed, and the first cavity 112 is isolated from the second cavity 122. As the air-conditioning system continues to operate, the liquid level in the first cavity 112 gradually rises, so that the liquid level in the first cavity 112 is maintained between the first oil return hole 162 and the second oil return hole 163. A certain amount of oil is stored in the first cavity 112 to avoid insufficient oil return from the compressor 1.

[0103] When the liquid level sensor detects that the liquid level in the first chamber 112 is higher than the first oil return hole 162, the oil storage amount in the first chamber 112 is large, the first on-off valve 141 and the second on-off valve 131 are closed, the first chamber 112 is connected to the second chamber 122, and the oil in the first chamber 112 flows into the second chamber 122 through the oil equalizing pipe 140, avoiding excessive oil return from the compressor 1.

[0104] In some embodiments of this application, refer to Figure 5 The air conditioning system also includes a plurality of oil separators 6 , and an oil separator 6 is provided on the connecting pipeline between the exhaust port of any compressor 1 and the four-way reversing valve 2 .

[0105] The air conditioning system also includes multiple oil return branches 8, which are correspondingly connected to multiple oil separators 6. The first end of any oil return branch 8 is connected to the first pipeline 7, and the second end is connected to the oil outlet of the corresponding oil separator 6.

[0106] Taking the refrigeration of the air-conditioning system as an example, the refrigerant discharged from the two compressors 1 first flows through the corresponding oil separators 6, and is separated from the oil and gas by the oil separators 6.

[0107] The gaseous refrigerant flowing out of the oil separator 6 flows through the D end and C end of the four-way reversing valve 2, the condenser 3, the throttling device 5, and the evaporator 4 in sequence, and then through the E end and S end of the four-way reversing valve 2, the first pipeline 7, and the air inlet pipe 150 into the first cavity 112. The refrigerant is separated into gas and liquid in the first cavity 112, and the separated gaseous refrigerant is returned to the compressor 1 through the air outlet pipe 160.

[0108] The oil flowing out of the oil separator 6 flows into the first pipeline 7 through the corresponding oil return branch 8 , and then flows into the first chamber 112 through the intake pipe 150 .

[0109] Multiple oil return branches 8 are connected to the first pipeline 7. The oil returning from the multiple oil return branches 8 flows into the first cavity 112 through the first pipeline 7 and the intake pipe 150. Multiple compressors 1 return oil from the first cavity 112 in a unified manner, avoiding the problem of different return oil concentrations of multiple compressors 1.

[0110] In some embodiments of the present application, a throttling element 9 is provided on any oil return branch 8. Since the amount of oil separated from the oil separator 6 is small, the oil return branch 8 does not require a large flow rate, and throttling is performed by the throttling element 9. For example, the throttling element 9 is a capillary tube.

[0111] If the throttling device 9 is not provided on the oil return branch 8, the gaseous refrigerant flowing through the oil separator 6 will directly return to the gas-liquid separation device 100 through the oil return branch 8, causing system losses.

[0112] In some embodiments of this application, refer to Figure 6 The air conditioning system also includes an oil separator 6, which includes an inlet, a refrigerant outlet and an oil outlet. The exhaust ports of multiple compressors 1 are connected to the inlet through pipelines, and the refrigerant outlet is connected to the four-way reversing valve 2 through pipelines.

[0113] The air conditioning system further includes an oil return branch 8 , a first end of which is connected to the first pipeline 7 , and a second end of which is connected to the oil outlet.

[0114] The refrigerants discharged from the multiple compressors 1 all flow through the same oil separator 6, and only one oil return branch 8 is provided to reduce the structural cost.

[0115] In some embodiments of the present application, an air conditioning system is provided, referring to Figure 9 The air conditioning system includes a condenser 3. The air conditioning system also includes an evaporator 4. The air conditioning system also includes a four-way reversing valve 2. The four-way reversing valve 2 includes a C end, a D end, an E end, and an S end. The air conditioning system also includes a throttling device 5, etc.

[0116] The air conditioning system further comprises at least two compressors 1. The exhaust port of any compressor 1 is connected to the D end of the four-way reversing valve 2 through a pipeline.

[0117] The air-conditioning system also includes a gas-liquid separation device 100. The gas-liquid separation device 100 is used to expand the capacity of the air-conditioning system to improve the cooling effect or heating effect of the air-conditioning system. The gas-liquid separation device 100 is used to separate the gaseous refrigerant and the liquid refrigerant in the refrigerant flowing through the evaporator 4, and at the same time separate the lubricating oil carried by the refrigerant and store it in the gas-liquid separation device 100, and then the lubricating oil stored in the gas-liquid separation device 100 is transported to the compressor 1 along with the gaseous refrigerant through the oil return hole in the gas-liquid separation device 100 to lubricate the vortex part of the compressor 1, thereby avoiding abnormal wear of the compressor 1 due to insufficient oil supply, thereby causing a failure of the compressor 1 and affecting the life of the compressor 1.

[0118] Reference Figure 7 The gas-liquid separation device 100 includes a first sub-gas-liquid separator 110 .

[0119] The first sub-gas-liquid separator 110 includes a first cylinder 111 , and a first cavity 112 is formed inside the first cylinder 111 .

[0120] The first sub-gas-liquid separator 110 further includes at least two gas outlet pipes 160 , and the at least two gas outlet pipes 160 are correspondingly connected to the air intakes of at least two compressors 1 . Figure 9 The air-conditioning system shown includes two compressors 1 and two air outlet pipes 160 , and the two compressors 1 are connected to the two air outlet pipes 160 correspondingly.

[0121] The gas-liquid separation device 100 further includes a second sub-gas-liquid separator 120 .

[0122] The second sub-separator includes a second cylinder 121 , and a second cavity 122 is formed in the second cylinder 121 .

[0123] The second sub-gas-liquid separator 120 includes an air inlet pipe 150 , which is connected to the S end of the four-way reversing valve 2 .

[0124] The gas-liquid separation device 100 further includes an oil balancing pipe 140 . The oil balancing pipe 140 is connected between the first cylinder 111 and the second cylinder 121 and is configured to communicate with the first cavity 112 and the second cavity 122 to balance the oil storage between the first cavity 112 and the second cavity 122 .

[0125] The gas-liquid separation device 100 further includes a pressure equalizing pipe 130 . The pressure equalizing pipe 130 is connected between the first cylinder 111 and the second cylinder 121 and is configured to communicate with the first cavity 112 and the second cavity 122 to balance the gas pressure therebetween.

[0126] Reference Figure 9 Taking the air conditioning system as an example, the refrigerant discharged from the two compressors 1 flows through the D end and C end of the four-way reversing valve 2, the condenser 3, the throttling device 5, the evaporator 4 in sequence, and then through the E end and S end of the four-way reversing valve 2, the first pipeline 7, and the air inlet pipe 150 into the second cavity 122. The refrigerant then flows into the first cavity 112. The refrigerant is separated into gas and liquid in the first cavity 112, and the separated gaseous refrigerant returns to the compressor 1 through the air outlet pipe 160.

[0127] The gas-liquid separation device 100 includes a first sub-gas-liquid separator 110 and a second sub-gas-liquid separator 120. The oil balance is achieved between the first sub-gas-liquid separator 110 and the second sub-gas-liquid separator 120 through the oil equalizing pipe 140, and the gas balance is achieved through the pressure equalizing pipe 130. The air intakes of the two compressors 1 are connected to the corresponding air outlet pipes 160 on the first sub-gas-liquid separator 110 through pipelines. The refrigerant circulating in the air-conditioning system returns to the first sub-gas-liquid separator 110 through the same air inlet pipe 150. The air inlet pipe 150 is arranged on the second sub-gas-liquid separator 120 to reduce the risk of liquid return from the compressor 1 and at the same time achieve fast oil return and good reliability of the air-conditioning system during transitional working conditions.

[0128] In some embodiments of this application, refer to Figure 8 The oil balancing pipe 140 is provided with a first on-off valve 141, and the first on-off valve 141 is configured to control the opening or closing of the oil balancing pipe 140. For example, the first on-off valve 141 is a solenoid valve.

[0129] The pressure equalizing tube 130 is provided with a second on-off valve 131, and the second on-off valve 131 is configured to control the opening or closing of the pressure equalizing tube 130. For example, the second on-off valve 131 is a solenoid valve.

[0130] When the air-conditioning system switches from cooling mode to heating mode, a large amount of liquid refrigerant will return to the gas-liquid separation device 100. If the first on-off valve and the second on-off valve are not provided, a large amount of liquid refrigerant entering the second cavity 122 will enter the first cavity 112, causing a large amount of liquid return to the compressor 1.

[0131] In some embodiments of this application, refer to Figure 9 The air conditioning system also includes a plurality of oil separators 6 , and an oil separator 6 is provided on the connecting pipeline between the exhaust port of any compressor 1 and the four-way reversing valve 2 .

[0132] The air-conditioning system also includes multiple oil return branches 8, which are correspondingly connected to multiple oil separators 6. The first end of any oil return branch 8 is connected to the first sub-gas-liquid separator 110, and the second end is connected to the oil outlet of the corresponding oil separator 6.

[0133] Taking the refrigeration of the air-conditioning system as an example, the refrigerant discharged from the two compressors 1 first flows through the corresponding oil separators 6, and is separated from the oil and gas by the oil separators 6.

[0134] The gaseous refrigerant flowing out of the oil separator 6 flows through the D end and C end of the four-way reversing valve 2, the condenser 3, the throttling device 5, and the evaporator 4 in sequence, and then through the E end and S end of the four-way reversing valve 2, the first pipeline 7, and the air inlet pipe 150 into the second cavity 122. The separated gaseous refrigerant then returns to the compressor 1 through the air outlet pipe 160.

[0135] An oil inlet pipe 170 is provided on the first cylinder 111 . The oil flowing out of the oil separator 6 flows into the oil inlet pipe 170 through the corresponding oil return branch 8 and then flows into the first chamber 112 .

[0136] The air inlet pipe 150 is arranged on the second sub-gas-liquid separator 120, and the air outlet pipe 160 and the oil inlet pipe 170 are arranged on the first sub-gas-liquid separator 110. In this way, when liquid returns to the air inlet pipe 150, the risk of liquid return in the compressor 1 can be reduced.

[0137] In some embodiments of this application, refer to Figure 10 The air conditioning system also includes an oil separator 6, which includes an inlet, a refrigerant outlet and an oil outlet. The exhaust ports of multiple compressors 1 are connected to the inlet through pipelines, and the refrigerant outlet is connected to the four-way reversing valve 2 through pipelines.

[0138] The air conditioning system further includes an oil return branch 8 , a first end of the oil return branch 8 is connected to the first sub-gas-liquid separator 110 , and a second end is connected to the oil outlet.

[0139] The refrigerants discharged from the multiple compressors 1 all flow through the same oil separator 6, and only one oil return branch 8 is provided to reduce the structural cost.

[0140] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0141] The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited to them. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this utility model should be included in the scope of protection of the present utility model. Therefore, the scope of protection of the present utility model should be based on the scope of protection of the claims.

Claims

1. An air conditioning system comprising: Condenser, evaporator, four-way reversing valve and throttling device; It is characterized by: Also included are: At least two compressors, the exhaust port of any one of the compressors is connected to the four-way reversing valve; The gas-liquid separation device comprises: a first sub-gas-liquid separator having a first cavity formed therein, the first sub-gas-liquid separator including an air inlet pipe connected to the four-way reversing valve via a first pipeline, and at least two air outlet pipes connected to the air intakes of the at least two compressors respectively; The second sub-gas-liquid separator has a second cavity formed therein; an oil balancing pipe, configured to communicate with the first cavity and the second cavity to balance the oil storage between the first cavity and the second cavity; The pressure equalizing tube is configured to connect the first cavity and the second cavity to balance the air pressure between the first cavity and the second cavity.

2. The air conditioning system according to claim 1, characterized in that Any of the air outlet pipes is provided with a pressure equalizing hole and a plurality of oil return holes, and the plurality of oil return holes are arranged at intervals along the height direction of the first cavity.

3. The air conditioning system according to claim 2, characterized in that The pressure equalizing pipe is arranged at a position higher than the air inlet end of the air outlet pipe.

4. The air conditioning system according to claim 2, characterized in that The oil balancing pipe is arranged at a position lower than the oil return hole located at a low position.

5. The air conditioning system according to claim 1, characterized in that The oil equalizing pipe is provided with a first on-off valve, and the pressure equalizing pipe is provided with a second on-off valve.

6. The air conditioning system according to any one of claims 1 to 5, characterized in that: The air conditioning system further comprises a plurality of oil separators, wherein the oil separator is provided on the connecting pipeline between the exhaust port of any compressor and the four-way reversing valve; The air conditioning system also includes multiple oil return branches, which are correspondingly connected to the multiple oil separators. The first end of any oil return branch is connected to the first pipeline, and the second end is connected to the oil outlet of the corresponding oil separator.

7. The air conditioning system according to any one of claims 1 to 5, characterized in that: The air conditioning system further includes an oil separator, the oil separator including an inlet, a refrigerant outlet, and an oil outlet, the exhaust ports of the plurality of compressors being connected to the inlet via pipelines, and the refrigerant outlet being connected to the four-way reversing valve via pipelines; The air conditioning system further includes an oil return branch, a first end of the oil return branch is connected to the first pipeline, and a second end of the oil return branch is connected to the oil outlet.

8. An air conditioning system comprising: Condenser, evaporator, four-way reversing valve and throttling device; It is characterized by: Also included are: At least two compressors, the exhaust port of any one of the compressors is connected to the four-way reversing valve; The gas-liquid separation device comprises: a first sub-gas-liquid separator having a first cavity formed therein, the first sub-gas-liquid separator including at least two gas outlet pipes, the at least two gas outlet pipes being connected to the suction ports of the at least two compressors respectively; A second sub-gas-liquid separator is formed with a second cavity therein, and the second sub-gas-liquid separator includes an air inlet pipe connected to the four-way reversing valve; an oil balancing pipe, configured to communicate with the first cavity and the second cavity to balance the oil storage between the first cavity and the second cavity; The pressure equalizing tube is configured to connect the first cavity and the second cavity to balance the air pressure between the first cavity and the second cavity.

9. The air conditioning system according to claim 8, characterized in that The air conditioning system further comprises a plurality of oil separators, wherein the oil separator is provided on the connecting pipeline between the exhaust port of any compressor and the four-way reversing valve; The air conditioning system also includes multiple oil return branches, which are correspondingly connected to the multiple oil separators. The first end of any oil return branch is connected to the first sub-gas-liquid separator, and the second end is connected to the oil outlet of the corresponding oil separator.

10. The air conditioning system according to claim 8, characterized in that The air conditioning system further includes an oil separator, the oil separator including an inlet, a refrigerant outlet, and an oil outlet, the exhaust ports of the plurality of compressors being connected to the inlet via pipelines, and the refrigerant outlet being connected to the four-way reversing valve via pipelines; The air conditioning system further includes an oil return branch, a first end of the oil return branch is connected to the first sub-gas-liquid separator, and a second end of the oil return branch is connected to the oil outlet.

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