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. An exhaust port of any compressor is connected with the four-way reversing valve; the oil separator is arranged on a pipeline between an exhaust port of the compressor and the four-way reversing valve; the at least two compressors are correspondingly connected with the at least two gas-liquid separators, any gas-liquid separator comprises a gas inlet pipe and a gas outlet pipe, the gas inlet pipes of the at least two gas-liquid separators are connected in a converged mode and connected with the four-way reversing valve through a first pipeline, and the gas outlet pipes of the at least two gas-liquid separators are connected with the four-way reversing valve through a second pipeline. Gas outlet pipes of the at least two gas-liquid separators are connected with gas suction ports of the corresponding compressors; the oil return branch is arranged between the oil separator and the first pipeline; the oil balancing pipe is configured to be communicated with the at least two gas-liquid separators; and the pressure equalizing pipe is configured to be communicated with the at least two gas-liquid separators. According to the scheme, the problem that the oil quantity distribution of multiple 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 Figures 1 to 3 , Figure 1 A schematic diagram of an air conditioning system. Figure 2 A flow diagram for an air conditioning system. Figure 3 This is a structural diagram of a gas-liquid separator. The air-conditioning system includes two compressors 1, two gas-liquid separators 10, 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 10 includes an air inlet pipe 20 and an air outlet pipe 30. The air outlet pipe 30 is a U-shaped pipe. The air outlet pipe 30 is provided with an upper oil return hole, a lower oil return hole and a pressure equalizing hole. The two compressors 1 are connected to the two gas-liquid separators 10 accordingly. A pressure equalizing pipe 40 and an oil equalizing pipe 50 are provided between the two gas-liquid separators 10 to achieve the effect of equalizing pressure and liquid. The air-conditioning system also includes two oil return branches 8. The oil return branch 8 is provided between the corresponding oil separator 6 and the air inlet pipe of the corresponding gas-liquid separator 10. The two oil return branches 8 are independent of each other. When the evaporator 4 returns liquid, the refrigerant returning from the S end of the four-way reversing valve 2 is in gas-liquid two-phase form. When it is distributed to the two gas-liquid separators 01, the diverted gas-liquid two-phase refrigerant is mixed with the return oil of the corresponding return oil branch 8, resulting in different oil concentrations entering the two gas-liquid separators 10, and ultimately resulting in different return oil amounts of 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 multiple 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, including a condenser, an evaporator, a four-way reversing valve and a throttling device; at least two compressors, the exhaust port of any compressor being connected to the four-way reversing valve; an oil separator being arranged on the pipeline between the exhaust port of the compressor and the four-way reversing valve; at least two gas-liquid separators, at least two compressors being correspondingly connected to at least two gas-liquid separators, any gas-liquid separator including an inlet pipe and an outlet pipe, the inlet pipes of at least two gas-liquid separators being converged and connected to the four-way reversing valve through a first pipeline, and the outlet pipes of at least two gas-liquid separators being connected to the intake port of the corresponding compressor; an oil return branch being arranged between the oil separator and the first pipeline; an oil equalizing pipe being configured to connect at least two gas-liquid separators; and a pressure equalizing pipe being configured to connect at least two gas-liquid separators.

[0008] The above technical solution has the following advantages or beneficial effects: the point where any oil return branch connects to the first pipeline is located upstream of the junction of the multiple intake pipes. This allows the lubricating oil returning from the oil return branch to fully mix with the refrigerant in the first pipeline before being split. The refrigerant and lubricating oil in the first pipeline are then split at the junction and flow through the multiple intake pipes into the corresponding gas-liquid separators, thereby ensuring that the oil concentration in each gas-liquid separator is the same, thereby achieving uniform oil return from multiple compressors and preventing oil imbalance in the compressors.

[0009] In some embodiments of the present application, the air-conditioning system includes at least two oil separators, and the at least two oil separators are correspondingly connected to the at least two compressors. The oil return branch is arranged between the oil outlet of any oil separator and the first pipeline.

[0010] Another technical solution among the above technical solutions has the following advantages or beneficial effects: each compressor is equipped with an independent oil separator and oil return branch, which reduces the oil and gas separation amount of a single oil separator and improves the oil and gas separation effect.

[0011] In some embodiments of the present application, the air-conditioning system includes an oil separator, and the exhaust ports of the at least two compressors are connected to the inlet of the oil separator through pipelines; an oil return branch is provided between the oil outlet of the oil separator and the first pipeline.

[0012] Another technical solution among the above technical solutions has the following advantages or beneficial effects: multiple compressors share one oil separator and one oil return branch, which helps to reduce manufacturing costs.

[0013] In some embodiments of the present application, a throttling device is provided on the oil return branch.

[0014] Another technical solution in the above technical solution has the following advantages or beneficial effects:

[0015] In some embodiments of the present application, a pressure equalizing hole and a plurality of oil return holes are provided on the gas outlet pipe of the gas-liquid separator, and the plurality of oil return holes are arranged at intervals along the height direction of the gas-liquid separator.

[0016] Another technical solution in the above technical solution has the following advantages or beneficial effects:

[0017] In some embodiments of the present application, the pressure equalizing tube is arranged at a position higher than the air inlet end of the air outlet pipe.

[0018] Another technical solution of the above-mentioned technical solution has the following advantages or beneficial effects: Because the amount of oil separated from the oil separator is small, the oil return branch does not require a large flow rate and can be throttled by a throttling device. For example, the throttling device is a capillary tube. If the throttling device is not installed on the oil return branch, the gaseous refrigerant flowing through the oil separator will be directly returned to the gas-liquid separator through the oil return branch, causing system losses.

[0019] 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.

[0020] Another technical solution among the above technical solutions has the following advantages or beneficial effects: the oil equalizing pipe is arranged at a position lower than the oil return hole located at a low position, thereby ensuring the gas balance in the accommodating chambers of the two gas-liquid separators.

[0021] In some embodiments of the present application, the pressure equalizing tube is a bent tube, and the pressure equalizing tube is arranged on the outer peripheral side of the gas-liquid separator.

[0022] Another technical solution among the above technical solutions has the following advantages or beneficial effects: the pressure equalizing tube is a U-shaped tube with high structural strength. The pressure equalizing tube is arranged on the circumferential wall of the gas-liquid separator, which is easy to install.

[0023] In some embodiments of the present application, the oil balancing pipe is a bent pipe, and the oil balancing pipe is arranged on the outer peripheral side of the gas-liquid separator.

[0024] Another technical solution among the above technical solutions has the following advantages or beneficial effects: the oil balancing pipe is a U-shaped pipe with high structural strength. The oil balancing pipe is arranged on the circumferential wall of the gas-liquid separator, which is easy to install.

[0025] 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

[0026] 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.

[0027] Figure 1 A schematic diagram of an air conditioning system according to the prior art;

[0028] Figure 2 A flow diagram of an air conditioning system according to the prior art;

[0029] Figure 3 A structural diagram of a gas-liquid separator according to the prior art;

[0030] Figure 4 A structural diagram of two gas-liquid separators according to the prior art;

[0031] Figure 5 is a structural diagram of an air conditioning system according to some embodiments;

[0032] Figure 6 is a flow diagram of an air conditioning system according to some embodiments;

[0033] Figure 7 is a structural diagram of an air conditioning system according to some other embodiments;

[0034] Figure 8 is a flow diagram of an air conditioning system according to some other embodiments;

[0035] Figure 9 is a structural diagram of two gas-liquid separators according to some embodiments;

[0036] Figure 10 FIG. 4 is another structural diagram of two gas-liquid separators according to some embodiments.

[0037] Reference numerals:

[0038] 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;

[0039] 10. Gas-liquid separator; 11. Cylinder; 12. Accommodation chamber;

[0040] 20. Intake pipe;

[0041] 30. Air outlet pipe; 31. Pressure equalizing hole; 32. First oil return hole; 33. Second oil return hole; 34. First pipe section; 35. Second pipe section; 36. Third pipe section;

[0042] 40. Pressure equalizing tube;

[0043] 50. Equal oil pipeline. DETAILED DESCRIPTION

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] The air conditioning system also includes a gas-liquid separator 10. The gas-liquid separator 10 is used to expand the capacity of the air conditioning system to improve the cooling or heating effect of the air conditioning system. The gas-liquid separator 10 is used to separate the gaseous refrigerant and the liquid refrigerant in the refrigerant flowing through the evaporator 4. At the same time, the lubricating oil carried by the refrigerant is separated and stored in the gas-liquid separator 10. The lubricating oil stored in the gas-liquid separator 10 is then transported to the compressor 1 along with the gaseous refrigerant through the oil return hole in the gas-liquid separator 10 to lubricate the scroll portion of the compressor 1, thereby preventing abnormal wear of the compressor 1 due to insufficient oil supply, which may cause compressor 1 failure and shorten the life of the compressor 1.

[0058] 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.

[0059] Reference Figures 2 to 4There is an air-conditioning system, which includes two compressors 1, two gas-liquid separators 10, 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 10 includes an air inlet pipe 20 and an air outlet pipe 30. The air outlet pipe 30 is a U-shaped pipe, and the air outlet pipe 30 is provided with an upper oil return hole, a lower oil return hole and a pressure equalizing hole. The two compressors 1 are connected to the two gas-liquid separators 10 accordingly. A pressure equalizing pipe 40 and an oil equalizing pipe 50 are provided between the two gas-liquid separators 10 to achieve the effect of equalizing pressure and liquid. The air-conditioning system also includes two oil return branches 8. The oil return branches 8 are provided between the corresponding oil separator 6 and the air inlet pipe of the corresponding gas-liquid separator 10, and the two oil return branches 8 are independent of each other. When the evaporator 4 returns liquid, the refrigerant returning from the S end of the four-way reversing valve 2 is in gas-liquid two-phase form. When it is distributed to the two gas-liquid separators 01, the diverted gas-liquid two-phase refrigerant is mixed with the return oil of the corresponding return oil branch 8, resulting in different oil concentrations entering the two gas-liquid separators 10, and ultimately resulting in different return oil amounts of the two compressors 1.

[0060] For example, refer to Figure 4 Assuming that the return oil volumes of the two oil return branches 8 are the same, the oil concentration in the gas-liquid separator 10 with a larger return oil volume will become smaller. Figure 4 In the embodiment, the return liquid amount of the left gas-liquid separator 10 is large, and the return liquid amount of the right gas-liquid separator 10 is small, which will eventually lead to a low oil concentration in the left gas-liquid separator 10 and a high oil concentration in the right gas-liquid separator 10.

[0061] In order to solve this technical problem, in some embodiments of the present application, referring to Figure 5 The air conditioning system further includes an oil separator 6. The oil separator 6 is arranged on the pipeline between the exhaust port of the compressor 1 and the four-way reversing valve 2.

[0062] The air conditioning system further comprises at least two gas-liquid separators 10. The at least two compressors 1 are connected to the at least two gas-liquid separators 10 correspondingly.

[0063] Any gas-liquid separator 10 includes an air inlet pipe 20. The air inlet pipes 20 of at least two gas-liquid separators 10 are connected to each other and connected to the four-way reversing valve 2 through the first pipeline 7.

[0064] In other words, at least two gas-liquid separators 10 are correspondingly provided with at least two air inlet pipes 20 , which are joined at a junction P. One end of the first pipeline 7 is connected to the S end of the four-way reversing valve 2 , and the other end is connected to the junction P.

[0065] Each gas-liquid separator 10 further includes an air outlet pipe 30. The air outlet pipes 30 of at least two gas-liquid separators 10 are connected to the air intake of the corresponding compressor 1.

[0066] The air conditioning system further includes an oil balancing pipe 50 . The oil balancing pipe 50 is configured to communicate with at least two gas-liquid separators 10 to balance the oil storage between the at least two gas-liquid separators 10 .

[0067] The air conditioning system further includes a pressure equalizing pipe 40 . The pressure equalizing pipe 40 is configured to communicate with at least two gas-liquid separators 10 to balance the gas pressure between the at least two gas-liquid separators 10 .

[0068] The air conditioning system further includes an oil return branch 8 . The oil return branch 8 is arranged between the oil outlet of the oil separator 6 and the first pipeline 7 .

[0069] Reference Figure 6 Taking the refrigeration of the air-conditioning system as an example, the refrigerant discharged from multiple compressors 1 first flows through the oil separator 6 for oil and gas separation; the gaseous refrigerant separated by the oil separator 6 continues to flow 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 then enters the corresponding gas-liquid separator 10 through multiple intake pipes 20. The refrigerant is separated into gas and liquid in the gas-liquid separator 10, and the separated gaseous refrigerant is returned to the compressor 1 through the outlet pipe 30; the lubricating oil separated by the oil separator 6 flows to the first pipeline 7 through the oil return branch 8, and then flows into the gas-liquid separator 10 from the intake pipe 20.

[0070] The point where any oil return branch 8 connects to the first pipeline 7 is located upstream of the junction point P of the multiple intake pipes 20. This allows the lubricating oil returning from the oil return branch 8 to fully mix with the refrigerant in the first pipeline 7 before being split. The refrigerant and lubricating oil in the first pipeline 7 are then split from the junction point P and flow through the multiple intake pipes 20 into the corresponding gas-liquid separators 10, thereby ensuring the same oil concentration in each gas-liquid separator 10, thereby achieving uniform oil return from multiple compressors 1 and preventing oil imbalance in the compressors 1.

[0071] In some embodiments of this application, refer to Figure 5 The air conditioning system includes at least two oil separators 6, which are correspondingly connected to at least two compressors 1. An oil return branch 8 is provided between the oil outlet of any oil separator 6 and the first pipeline 7.

[0072] Reference Figure 6Taking the refrigeration of the air-conditioning system as an example, the refrigerant discharged from multiple compressors 1 first flows through the corresponding oil separator 6 for oil-gas separation; the gaseous refrigerant separated by the multiple oil separators 6 is collected and continues to flow 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 then through multiple intake pipes 20 into the corresponding gas-liquid separator 10. The refrigerant is separated into gas and liquid in the gas-liquid separator 10, and the separated gaseous refrigerant is returned to the compressor 1 through the outlet pipe 30; the lubricating oil separated by each oil separator 6 flows to the first pipeline 7 through the corresponding oil return branch 8, and then flows into the gas-liquid separator 10 from the intake pipe 20.

[0073] Each compressor 1 is equipped with an independent oil separator 6 and an oil return branch 8, which reduces the oil and gas separation amount of a single oil separator 6 and improves the oil and gas separation effect.

[0074] In some embodiments of this application, refer to Figure 7 The air conditioning system includes an oil separator 6, and the exhaust ports of at least two compressors 1 are connected to the inlet of the oil separator 6 through pipelines. An oil return branch 8 is provided between the oil outlet of the oil separator 6 and the first pipeline 7.

[0075] Reference Figure 8 Taking the refrigeration of the air-conditioning system as an example, the refrigerant discharged from multiple compressors 1 is collected and flows through the oil separator 6 for oil-gas separation; the gaseous refrigerant separated by the oil separator 6 continues to flow 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 then through multiple intake pipes 20 into the corresponding gas-liquid separator 10. The refrigerant is separated into gas and liquid in the gas-liquid separator 10, and the separated gaseous refrigerant is returned to the compressor 1 through the outlet pipe 30; the lubricating oil separated by the oil separator 6 flows to the first pipeline 7 through the return oil branch 8, and then flows into the gas-liquid separator 10 from the intake pipe 20.

[0076] Multiple compressors 1 share one oil separator 6 and one oil return branch 8, which helps to reduce manufacturing costs.

[0077] In some embodiments of this application, refer to Figure 5 The air conditioning system includes two corresponding compressors 1, two gas-liquid separators 10, two oil separators 6 and two oil return branches 8. An oil equalizing pipe 50 and a pressure equalizing pipe 40 are provided between the two gas-liquid separators 10.

[0078] In some embodiments of this application, refer to Figure 7The air-conditioning system includes two corresponding compressors 1, two gas-liquid separators 10, an oil separator 6 and an oil return branch 8. The exhaust ports of the two compressors 1 are connected to the inlet of the oil separator 6 through pipelines, and an oil equalizing pipe 50 and a pressure equalizing pipe 40 are arranged between the two gas-liquid separators 10.

[0079] In some embodiments of this application, refer to Figure 5 or Figure 7 A throttling member 9 is provided on the 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 is throttled by the throttling member 9. For example, the throttling member 9 is a capillary tube.

[0080] If the throttling device 9 is not provided on the oil return branch 8, the gaseous refrigerant flowing through the oil separator 6 will be directly returned to the gas-liquid separator 10 through the oil return branch 8, causing system losses.

[0081] In some embodiments of this application, refer to Figure 9 The gas-liquid separator 10 includes a cylinder 11 , and a receiving chamber 12 is formed in the cylinder 11 .

[0082] In some embodiments of this application, refer to Figure 9 The outlet pipe 30 of the gas-liquid separator 10 is provided with a pressure equalizing hole 31 and a plurality of oil return holes, and the plurality of oil return holes are arranged at intervals along the height direction of the gas-liquid separator 10 .

[0083] For example, the air outlet pipe 30 includes a first pipe section 34, a second pipe section 35, and a third pipe section 36. The first and second pipe sections 34, 35 extend along the height of the accommodating chamber 12. The first end of the first pipe section 34 extends out of the accommodating chamber 12, the first end of the second pipe section 35 is located within the accommodating chamber 12, and the third pipe section 36 is connected between the second ends of the first and second pipe sections 34, 35.

[0084] For example, the upper end of the first pipe section 34 is its first end, and the lower end is its second end. The upper end of the second pipe section 35 is its first end, and the lower end is its second end.

[0085] The first pipe section 34 is provided with a pressure equalizing hole 31. The first pipe section 34 is provided with a pressure equalizing hole 31 at an upper position thereof.

[0086] The second pipe section 35 is provided with a first oil return hole 32. The third pipe section 36 is provided with a second oil return hole 33.

[0087] In some embodiments of this application, refer to Figure 9 The pressure equalizing tube 40 is positioned higher than the air inlet end of the air outlet pipe 30. That is, the pressure equalizing tube 40 is positioned higher than the upper end of the second pipe section 35. In this way, the gas balance in the accommodating chambers 12 of the two gas-liquid separators 10 is ensured.

[0088] If the pressure equalizing tube 40 is set higher than the air inlet end of the air outlet pipe 30, when the air pressure between the two accommodating chambers 12 is unbalanced, the pressure equalizing tube 40 may be lower than the liquid level, and thus the air balance between the two accommodating chambers 12 cannot be achieved.

[0089] In some embodiments of the present application, the oil balancing pipe 50 is positioned lower than the lower oil return hole. For example, the oil balancing pipe 50 is positioned lower than the second oil return hole 33. This ensures that the liquid level between the two accommodating chambers 12 is balanced.

[0090] In some embodiments of the present application, a fixing plate (not shown) is provided in the accommodating cavity 12 , and the first pipe section 34 and the second pipe section 35 of the air outlet pipe 30 are connected through the fixing plate, thereby improving the installation stability of the air outlet pipe 30 .

[0091] In some embodiments of the present application, the two gas-liquid separators 10 have the same structure and size, and have good versatility.

[0092] In some embodiments of the present application, the pressure equalizing tube 40 is a bent tube, and the pressure equalizing tube 40 is arranged on the outer peripheral side of the gas-liquid separator 10 . Figure 10 It is a structural diagram observed from the top side of the gas-liquid separator 10.

[0093] In some embodiments of this application, refer to Figure 10 The pressure-equalizing tube 40 is a U-shaped tube. It 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 one gas-liquid separator 10, one end of the second pressure-equalizing tube is connected to the circumferential wall of the other adjacent gas-liquid separator 10, and the third pressure-equalizing tube is located outside the circumferential walls of both gas-liquid separators 10.

[0094] The pressure equalizing tube 40 is a U-shaped tube with high structural strength. The pressure equalizing tube 40 is arranged on the circumferential wall of the gas-liquid separator 10 for easy installation.

[0095] In some embodiments of the present application, the pressure-equalizing tube 40 is a U-shaped tube. The pressure-equalizing tube 40 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 one gas-liquid separator 10, one end of the second pressure-equalizing tube is connected to the top wall of the other gas-liquid separator 10, and the third pressure-equalizing tube is located at the top of the gas-liquid separator 10.

[0096] The pressure equalizing pipe 40 is a U-shaped pipe with high structural strength. The pressure equalizing pipe 40 is arranged on the top of the gas-liquid separator 10 for easy installation.

[0097] In some embodiments of the present application, the oil balancing pipe 50 is a bent pipe, and the oil balancing pipe 50 is arranged on the outer peripheral side of the gas-liquid separator 10 .

[0098] The oil balancing pipe 50 is a U-shaped pipe comprising a first oil balancing pipe, a second oil balancing pipe, and a third oil balancing pipe. The third oil balancing pipe is connected between the first and second oil balancing pipes. One end of the first oil balancing pipe is connected to the circumferential wall of one gas-liquid separator 10, one end of the second oil balancing pipe is connected to the circumferential wall of the other gas-liquid separator 10, and the third oil balancing pipe is located outside the circumferential wall of the gas-liquid separator 10.

[0099] The oil balancing pipe 50 is a U-shaped pipe with high structural strength. The oil balancing pipe 50 is arranged on the circumferential wall of the gas-liquid separator 10 for easy installation.

[0100] In some embodiments of the present application, filters are provided at the first oil return hole 32 and the second oil return hole 33 to prevent impurities from entering the air-conditioning system.

[0101] 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.

[0102] 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 in that Also included are: At least two compressors, the exhaust port of any one of the compressors is connected to the four-way reversing valve; an oil separator, arranged on the pipeline between the exhaust port of the compressor and the four-way reversing valve; At least two gas-liquid separators, the at least two compressors being connected to the at least two gas-liquid separators correspondingly, each of the gas-liquid separators comprising an inlet pipe and an outlet pipe, the inlet pipes of the at least two gas-liquid separators being joined and connected to the four-way reversing valve via a first pipeline, and the outlet pipes of the at least two gas-liquid separators being connected to the corresponding suction port of the compressor; an oil return branch, provided between the oil outlet of the oil separator and the first pipeline; an oil balancing pipe, configured to communicate with the at least two gas-liquid separators to balance the oil storage between the at least two gas-liquid separators; The pressure equalizing pipe is configured to communicate with the at least two gas-liquid separators to balance the gas pressure between the at least two gas-liquid separators.

2. The air conditioning system according to claim 1, characterized in that The air conditioning system includes at least two oil separators, and the at least two oil separators are correspondingly connected to the at least two compressors. The oil return branch is provided between the oil outlet of any oil separator and the first pipeline.

3. The air conditioning system according to claim 1, characterized in that The air conditioning system includes an oil separator, and the exhaust ports of the at least two compressors are connected to the inlet of the oil separator through pipelines; An oil return branch is provided between the oil outlet of the oil separator and the first pipeline.

4. The air conditioning system according to claim 1, characterized in that The air conditioning system includes two corresponding compressors, two gas-liquid separators, two oil separators and two oil return branches, and the oil equalizing pipe and the pressure equalizing pipe are arranged between the two gas-liquid separators.

5. The air conditioning system according to claim 1, characterized in that The air-conditioning system includes two corresponding compressors, two gas-liquid separators, an oil separator and an oil return branch. The exhaust ports of the two compressors are connected to the inlet of the oil separator through pipelines, and the oil equalizing pipe and the pressure equalizing pipe are arranged between the two gas-liquid separators.

6. The air conditioning system according to any one of claims 1 to 5, characterized in that: A throttling element is provided on the oil return branch line.

7. The air conditioning system according to any one of claims 1 to 5, characterized in that: The gas outlet pipe of the gas-liquid separator 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 gas-liquid separator.

8. The air conditioning system according to claim 7, characterized in that The pressure equalizing pipe is arranged at a position higher than the air inlet end of the air outlet pipe.

9. The air conditioning system according to claim 7, characterized in that The oil balancing pipe is arranged at a position lower than the oil return hole located at a low position.

10. The air conditioning system according to any one of claims 1 to 5, characterized in that: The pressure equalizing tube is a bent tube, and the pressure equalizing tube is arranged on the outer peripheral side of the gas-liquid separator; The oil balancing pipe is a bent pipe and is arranged on the outer peripheral side of the gas-liquid separator.

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