Air conditioning system

Abstract

The invention provides an air conditioning system, and relates to the technical field of air conditioners. The air conditioning system comprises a main loop and an oil return loop. The main loop comprises a compressor, an oil separator, a first heat exchanger and a second heat exchanger which are sequentially communicated, the compressor is provided with an air suction port and an exhaust port which are arranged at intervals, and an air inlet of the oil separator is connected to the exhaust port of the compressor; an inlet of the oil return loop communicates with an oil return opening of the oil separator, and an outlet of the oil return loop communicates with an air suction opening of the compressor. A cooling assembly is arranged on the oil return loop and communicated between the oil return opening and the air suction opening. At least one of the first heat exchanger and the second heat exchanger is provided with a cooling assembly. The first heat exchanger and / or the second heat exchanger can cool oil liquid while completing refrigerating or heating circulation, one object has two purposes, and cost is saved. After cooling, the oil liquid does not raise the temperature of the refrigerant at the air suction port, the specific volume of the refrigerant is not changed or reduced, and the flow of the refrigerant output by the compressor is ensured.

Description

Technical Field

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

[0002] Variable frequency compressors have a relatively high oil discharge rate when operating at high frequencies. To prevent wear and tear due to oil shortages in the compressor and to prevent large amounts of refrigerant oil from entering the heat exchanger, which could affect heat exchange efficiency, an oil separator is typically installed on the compressor exhaust line to separate the refrigerant oil from the gaseous refrigerant and return it to the compressor's intake port. Since the refrigerant oil separated from the oil separator is at a higher temperature, returning it directly to the compressor's intake port will increase the compressor's intake temperature. The higher the refrigerant gas temperature, the greater its specific volume. This significantly reduces the refrigerant's mass flow rate at the same volume flow rate, thus affecting the unit's cooling capacity (or heating capacity) and energy efficiency coefficient. Summary of the Invention

[0003] Based on this, it is necessary to provide an air conditioning system to prevent the refrigeration oil from raising the refrigerant temperature at the suction port.

[0004] An air-conditioning system, which includes a main circuit and an oil return circuit; the main circuit includes a compressor, an oil separator, a first heat exchanger and a second heat exchanger connected in sequence, the compressor is provided with an intake port and an exhaust port arranged at intervals, and the intake port of the oil separator is connected to the exhaust port of the compressor; the inlet of the oil return circuit is connected to the oil return port of the oil separator, and the outlet of the oil return circuit is connected to the intake port of the compressor; a cooling component is provided on the oil return circuit, and the cooling component is connected between the oil return port and the intake port; wherein, at least one of the first heat exchanger and the second heat exchanger is provided with the cooling component, and the refrigerant oil in the cooling component can be cooled by the first heat exchanger and / or the second heat exchanger.

[0005] It can be understood that the main circuit is the main circuit for the refrigeration or heating cycle. The high-temperature and high-pressure refrigerant gas discharged by the compressor first passes through the oil separator in the main circuit to separate the oil droplets carried by the refrigerant gas. The separated oil droplets converge and are discharged from the oil return port to the oil return circuit. The cooling component in the oil return circuit can cool the refrigeration oil through the first heat exchanger and / or the second heat exchanger. The first heat exchanger and / or the second heat exchanger cool the oil while completing the refrigeration or heating cycle, achieving a dual purpose. There is no need to purchase additional equipment, which helps save costs. After cooling, the impact of the oil on the temperature and specific volume of the intake air is greatly reduced, ensuring the refrigerant flow output by the compressor and helping to improve the overall energy efficiency of the compressor.

[0006] In one embodiment, the first heat exchanger is an air-cooled heat exchanger that cools the refrigeration oil by air cooling; and / or the second heat exchanger is a water-cooled heat exchanger that cools the refrigeration oil by water cooling.

[0007] It is understandable that such an arrangement does not require cooling of the refrigeration oil by the refrigerant, but rather cools the refrigeration oil while cooling the refrigerant, thereby reducing the direct impact on the heat exchange of the refrigerant.

[0008] In one embodiment, the oil return circuit includes a first branch and a second branch, the first branch is located between the oil return port of the oil separator and the suction port of the compressor; the second branch is arranged in parallel with the first branch; the cooling assembly includes a first cooling assembly and a second cooling assembly, the first branch is connected to the first cooling assembly, and the second branch is connected to the second cooling assembly; the first cooling assembly is arranged on the first heat exchanger; the second cooling assembly is arranged on the second heat exchanger.

[0009] It is understandable that by designing the first and second branches, the opening and closing of the different branches can be selected according to different operating conditions to ensure sufficient cooling of the refrigeration oil, facilitate the smooth operation of the main circuit, and minimize the impact on the energy efficiency of the main circuit. The first heat exchanger is used to heat the refrigeration oil in the first cooling component, and the second heat exchanger is used to heat the refrigeration oil in the second cooling component. This fully utilizes the first and second heat exchangers, eliminates the need for additional heat exchange devices, saves costs, and serves two purposes.

[0010] In one embodiment, the oil return circuit includes a first branch and a second branch, the first branch is located between the oil return port of the oil separator and the air intake port of the compressor; the second branch is arranged in parallel with the first branch; the cooling component includes a first cooling component and a second cooling component; the first branch is connected to a third heat exchanger, the first cooling component is arranged in the third heat exchanger, and the refrigerant oil in the first cooling component is cooled by the third heat exchanger; the second cooling component is arranged in the second heat exchanger; or, the second branch is connected to a fourth heat exchanger, the second cooling component is arranged in the fourth heat exchanger, and the refrigerant oil in the second cooling component is cooled by the fourth heat exchanger; the first cooling component is arranged in the first heat exchanger.

[0011] It is understandable that by additionally setting up a third heat exchanger to cool the refrigeration oil, it is not affected by the refrigeration or heating conditions, and the first branch can be selected to always remain connected to the return oil port to ensure the cooling effect of the refrigeration oil. The provision of the second heat exchanger can reduce the increase of additional heat exchange devices, and can cool the refrigeration oil while exchanging heat with the refrigerant, thus serving two purposes. By additionally setting up a fourth heat exchanger to cool the refrigeration oil, it is not affected by the refrigeration or heating conditions, and the second branch can be selected to always remain connected to the return oil port to ensure the cooling effect of the refrigeration oil. The provision of the first heat exchanger can reduce the increase of additional heat exchange devices, and can cool the refrigeration oil while exchanging heat with the refrigerant, thus serving two purposes.

[0012] In one embodiment, a first control valve is provided on the first branch, and a second control valve is provided on the second branch; the first control valve is configured to open and close the first branch in response to the switching mode of the main circuit, and the second control valve is configured to open and close the second branch in response to the switching mode of the main circuit; or, the return oil circuit is provided with a third control valve, the third control valve has an inlet and two outlets, one of the two outlets of the third control valve is connected to the first branch, and the other is connected to the second branch, the inlet of the third control valve is connected to the return oil port, and the third control valve selectively connects to the first branch or the second branch.

[0013] It is understandable that, according to different modes of the main circuit, the opening and closing of the first control valve and the second control valve or the third control valve is adjusted to facilitate the selection of different branches, which is easy to operate.

[0014] In one embodiment, when the main circuit is in cooling mode, the first branch is configured to communicate with the oil return port in response to the cooling mode; the second branch is configured to disconnect from the oil return port in response to the cooling mode; when the main circuit is in heating mode, the first branch is configured to disconnect from the oil return port in response to the heating mode; the second branch is configured to communicate with the oil return port in response to the heating mode.

[0015] It is understandable that the on and off of different branches are switched according to the difference between the cooling mode and the heating mode of the main circuit to ensure that the energy efficiency of the cooling mode or the heating mode meets the working condition requirements.

[0016] In one embodiment, the cooling assembly includes an oil return coil connected between the oil return port and the air intake port.

[0017] It is understandable that the provision of the oil return coil is conducive to slowing down the flow rate of the refrigeration oil and prolonging the heat exchange time of the refrigeration oil.

[0018] In one embodiment, the air-cooled heat exchanger includes a fan and a first heat exchange tube group arranged at intervals. The fan and the return oil coil are arranged relative to each other along a first direction. Along the first direction, the first heat exchange tube group is located between the fan and the return oil coil; along the second direction, the first heat exchange tube group is provided on both sides of the fan, and at least part of the airflow generated when the fan is in operation flows through the return oil coil.

[0019] It is understandable that the airflow generated by the fan can simultaneously exchange heat with the oil return coil and the first heat exchange tube, achieving a dual purpose effect.

[0020] In one embodiment, the water-cooled heat exchanger includes a shell and a second heat exchange tube group, the second heat exchange tube group is installed in the shell, refrigerant flows in the second heat exchange tube group, and water for exchanging heat with the refrigerant flows between the shell and the second heat exchange tube group; the oil return coil is attached to the side wall of the shell.

[0021] It is understandable that water can simultaneously exchange heat with the refrigerant and the refrigeration oil in the oil return coil, thus achieving a dual purpose.

[0022] In one embodiment, the oil return coil is spirally wrapped around the side wall of the shell along the axial direction of the shell; or, the oil return coil includes a plurality of refrigeration oil heat exchange tubes and connecting tubes, and the plurality of refrigeration oil heat exchange tubes are arranged at intervals along the circumference of the shell, and any two adjacent refrigeration oil heat exchange tubes are connected by the connecting tube, and the oil return coil is arranged in an "S" shape on the side wall of the shell.

[0023] It is understandable that the oil return coil is arranged in a spiral shape or in an "S" shape, which has a longer heat exchange path and promotes heat exchange of the refrigeration oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic diagram of a first embodiment of an air-conditioning system provided in this application;

[0026] Figure 2 A schematic diagram of a second embodiment of an air-conditioning system provided in this application;

[0027] Figure 3A schematic diagram of a third embodiment of an air-conditioning system provided in this application;

[0028] Figure 4 A schematic diagram of a fourth embodiment of an air-conditioning system provided in this application;

[0029] Figure 5 A schematic diagram of a fifth embodiment of the air-conditioning system provided in this application;

[0030] Figure 6 A schematic diagram of a sixth embodiment of the air-conditioning system provided in this application;

[0031] Figure 7 This is a schematic structural diagram of the first heat exchanger in the air-conditioning system provided in this application;

[0032] Figure 8 This is a structural schematic diagram of an embodiment of a second heat exchanger in the air-conditioning system provided by this application;

[0033] Figure 9 This is a structural schematic diagram of another embodiment of the second heat exchanger in the air-conditioning system provided by this application.

[0034] Figure numerals: 100, air conditioning system; 10, main circuit; 11, compressor; 111, air intake port; 112, air exhaust port; 12, oil separator; 121, oil return port; 13, first heat exchanger; 131, first heat exchange tube group; 132, fan; 14, second heat exchanger; 141, shell; 15, economizer; 16, expansion valve; 17, gas-liquid separator; 18, four-way valve; 20, oil return circuit; 201, first branch; 202, second branch; 21, cooling assembly; 211, oil return coil; 2111, refrigeration oil heat exchange tube; 2112, connecting pipe; 22, capillary tube; 23, first control valve; 24, second control valve; 25, third control valve; 26, fourth control valve; 27, fifth control valve; 31, third heat exchanger; 32, fourth heat exchanger. DETAILED DESCRIPTION

[0035] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0036] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0037] Furthermore, 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 defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0038] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the relevant listed items.

[0040] See also Figures 1 to 9The present application provides an air-conditioning system 100, which includes a main circuit 10 and an oil return circuit 20; the main circuit 10 includes a compressor 11, an oil separator 12, a first heat exchanger 13 and a second heat exchanger 14 connected in sequence, the compressor 11 is provided with an air intake port 111 and an exhaust port 112 arranged at intervals, and the air intake of the oil separator 12 is connected to the exhaust port 112 of the compressor 11; the inlet of the oil return circuit 20 is connected to the oil return port 121 of the oil separator 12, and the outlet of the oil return circuit 20 is connected to the air intake port 111 of the compressor 11; a cooling component 21 is provided on the oil return circuit 20, and the cooling component 21 is connected between the oil return port 121 and the air intake port 111; wherein, at least one of the first heat exchanger 13 and the second heat exchanger 14 is provided with the cooling component 21, and the refrigerant oil in the cooling component 21 can be cooled by the first heat exchanger 13 and / or the second heat exchanger 14.

[0041] Thus, in the main circuit 10, the compressor 11 discharges high-temperature, high-pressure refrigerant gas from the exhaust port 112. The refrigerant gas passes through the oil separator 12, which can separate the refrigerant oil from the refrigerant gas. The refrigerant oil is discharged from the oil return port 121 into the oil return circuit 20. After passing through the cooling assembly 21 in the oil return circuit 20, it is cooled. The refrigerant continues to exchange heat with the first heat exchanger 13 and the second heat exchanger 14 in the main circuit 10 to achieve cooling or heating. Specifically, while the first heat exchanger 13 and the second heat exchanger 14 are each exchanging heat with the refrigerant, at least one of them can also cool the refrigerant oil in the cooling assembly 21, achieving a dual purpose. This eliminates the need for additional cooling equipment and cooling media, thus saving costs. The cooled refrigerant oil flows back into the compressor 11 from the air intake 111 of the compressor 11. At the air intake 111, the temperature of the refrigerant oil is the same as or lower than that of the refrigerant, so that the specific volume of the refrigerant remains unchanged or increases. Under the same volume flow rate, the mass flow rate of the refrigerant can remain unchanged or increase, ensuring the heating or cooling capacity of the refrigerant in the main circuit 10.

[0042] like Figure 1 and Figure 6 As shown, in a specific embodiment, the first heat exchanger 13 heats and cools the refrigeration oil in the cooling assembly 21; or, as shown in FIG. Figure 2 and Figure 5 As shown, the second heat exchanger 14 exchanges heat and cools down the refrigeration oil in the cooling assembly 21. Figure 3 and Figure 4 As shown, in other embodiments, both the first heat exchanger 13 and the second heat exchanger 14 can exchange heat and cool the refrigeration oil in the cooling assembly 21 .

[0043] like Figures 1 to 6As shown, in a specific embodiment, the oil return line also includes a capillary tube 22, which is connected between the outlet of the cooling assembly 21 and the air intake port 111 of the compressor 11. The capillary tube 22 can limit the flow of the refrigerant oil, promote the refrigerant oil to return to the air intake port 111 continuously and stably, and avoid the refrigerant oil returning too quickly, which may cause the refrigerant gas to leak from the oil return port 121 and flow to the air intake port 111.

[0044] For ease of explanation, the main circuit 10 will be first described in detail.

[0045] In a specific embodiment, the main circuit 10 further includes a four-way valve 18 and a gas-liquid separator 17. One of the four-way valve 18's ports is connected to the outlet of the oil separator 12, and the remaining three ports are connected to the first heat exchanger 13, the second heat exchanger 14, and the gas-liquid separator 17, respectively. The inlet of the gas-liquid separator 17 is connected to the port of the four-way valve 18, and the outlet of the gas-liquid separator 17 is connected to the intake port 111 of the compressor 11.

[0046] In a further embodiment, the main circuit 10 further includes an economizer 15 and an expansion valve 16 . An expansion valve 16 is provided between the outlet of the economizer 15 and the inlet of the first heat exchanger 13 , and between the outlet of the economizer 15 and the inlet of the second heat exchanger 14 .

[0047] like Figures 1 to 6 As shown, the main circuit 10 has two working conditions: cooling mode and heating mode. The white arrow passing through the main circuit 10 in the figure is the refrigerant flow direction in the heating mode, and the black arrow passing through the main circuit 10 in the figure is the refrigerant flow direction in the cooling mode.

[0048] In the refrigeration mode, the compressor 11 outputs high-temperature and high-pressure refrigerant gas. After the refrigerant oil is separated from the refrigerant gas by the oil separator 12, the refrigerant gas enters the four-way valve 18. The four-way valve 18 outputs the refrigerant gas to the first heat exchanger 13. After heat exchange in the first heat exchanger 13, the refrigerant enters the economizer 15 for supercooling, and then is throttled and reduced in pressure by the expansion valve 16 to form a low-temperature and low-pressure refrigerant liquid. The low-temperature and low-pressure refrigerant exchanges heat in the second heat exchanger 14, and absorbs heat from the air through the second heat exchanger 14 to achieve cooling of the air. After absorbing heat, the refrigerant evaporates into gas, passes through the four-way valve 18 and flows into the gas-liquid separator 17 to filter out droplets. The filtered refrigerant gas returns to the compressor 11 from the air intake 111 to continue the refrigeration cycle.

[0049] In the heating mode, the compressor 11 outputs high-temperature and high-pressure refrigerant gas. After the refrigerant oil is separated from the refrigerant gas by the oil separator 12, the refrigerant gas enters the four-way valve 18. The four-way valve 18 outputs the refrigerant gas to the second heat exchanger 14. The high-temperature and high-pressure refrigerant gas releases heat through the second heat exchanger 14, thereby causing the surrounding air to warm up. After the refrigerant releases heat and cools down, it enters the economizer 15 for supercooling. After throttling and reducing the pressure by the expansion valve 16, a low-temperature and low-pressure refrigerant liquid is formed. The low-temperature and low-pressure refrigerant exchanges heat in the first heat exchanger 13 and absorbs heat through the first heat exchanger 13. The refrigerant after absorbing heat evaporates into gas, passes through the four-way valve 18 and flows into the gas-liquid separator 17 to filter out droplets. The filtered refrigerant gas returns to the compressor 11 from the air intake 111 to continue the heating cycle.

[0050] In a further embodiment, the first heat exchanger 13 adopts an air-cooled heat exchanger, which cools the refrigerant oil by air cooling, that is, the air flow takes away the heat of the cooling component to achieve cooling. The air flow in the first heat exchanger 13 can cool the refrigerant while also cooling the refrigerant oil, without the need for additional heat exchange devices, which is conducive to reducing costs.

[0051] In another embodiment, the second heat exchanger 14 is a water-cooled heat exchanger. The water-cooled heat exchanger cools the refrigerant oil by water cooling and achieves cooling by absorbing heat by water. In this way, the refrigerant can be cooled while the refrigerant is cooled, without the need for additional heat exchange devices, which helps to reduce costs.

[0052] In a specific embodiment, the cooling assembly 21 includes an oil return coil 211, which is connected between the oil return port 121 of the oil separator 12 and the air intake port 111 of the compressor 11. The provision of the oil return coil 211 facilitates the formation of a longer heat exchange path, prolongs the heat exchange time of the refrigerant oil, slows the flow rate of the refrigerant oil, and improves the heat exchange efficiency of the refrigerant oil.

[0053] like Figure 7 As shown, in an optional embodiment, the air-cooled heat exchanger includes a fan 132 and a first heat exchange tube group 131, which are spaced apart. When the fan 132 is in operation, the airflow generated flows through the first heat exchange tube group 131. In the cooling mode of the main circuit 10, high-temperature, high-pressure refrigerant gas flows through the first heat exchange tube group 131. The air-cooled heat exchanger uses the airflow generated by the operation of the fan 132 to reduce the temperature of the refrigerant. In the heating mode of the main circuit 10, low-temperature, low-pressure refrigerant liquid flows through the first heat exchange tube group 131. The refrigerant liquid absorbs the temperature of the airflow output by the fan 132 and evaporates to form gas.

[0054] like Figure 7As shown, further, the fan 132 and the oil return coil 211 are arranged relative to each other in a first direction, and along the first direction, the first heat exchange tube group 131 is located between the fan 132 and the oil return coil 211; along the second direction, the first heat exchange tube group 131 is provided on both sides of the fan 132, and the airflow generated by the operation of the fan 132 at least partially flows through the oil return coil 211. In cooling mode, the airflow generated by the operation of the fan 132 can simultaneously exchange heat and cool the refrigerant oil in the oil return coil 211 and the high-temperature refrigerant in the first heat exchange tube group 131. The relative arrangement of the fan 132 and the cooling assembly 21 facilitates the airflow to flow directly through the cooling assembly 21, ensuring the area for heat exchange between the cooling assembly 21 and the airflow.

[0055] like Figure 8 and Figure 9 As shown, in an optional embodiment, the second heat exchanger 14 is configured as a water-cooled heat exchanger, which includes a shell 141 and a second heat exchange tube group. The second heat exchange tube group is installed in the shell 141. Refrigerant flows through the second heat exchange tube group, and water for heat exchange with the refrigerant flows between the shell 141 and the second heat exchange tube group. Thus, in the cooling mode of the main circuit 10, low-temperature, low-pressure refrigerant liquid flows through the second heat exchange tube group, and hot water flows between the shell 141 and the second heat exchange tube group. The hot water exchanges heat with the low-temperature, low-pressure refrigerant liquid, causing the refrigerant to absorb heat and evaporate to form gas that returns to the compressor 11. After being cooled by the refrigerant, the hot water becomes cold water and exchanges heat with the air, thereby cooling the air. In the heating mode of the main circuit 10, high-temperature and high-pressure refrigerant flows in the second heat exchange tube group, and cold water flows between the shell 141 and the second heat exchange tube group. The cold water exchanges heat with the high-temperature and high-pressure refrigerant gas, causing the refrigerant to release heat and cool down. The cold water absorbs the heat of the refrigerant and becomes hot water, and exchanges heat with the air to achieve heating of the air.

[0056] like Figure 8 and Figure 9 As shown, in a further embodiment, the oil return coil 211 is attached to the side wall of the housing 141. In heating mode, the cold water in the second heat exchanger 14 can simultaneously exchange heat and cool the refrigerated oil in the oil return coil 211 and the high-temperature refrigerant in the second heat exchange tube group. Specifically, the oil return coil 211 can be installed on the inner side wall of the housing 141 to directly exchange heat with the water, achieving high heat exchange efficiency. The oil return coil 211 can also be installed on the outer side wall of the housing 141, making it easier to install, simpler to operate, and more intuitive.

[0057] like Figure 8As shown, in some specific embodiments, the oil return coil 211 spirals along the axial direction of the housing 141 and surrounds the sidewall of the housing 141. This increases the overall length of the oil return coil 211, thereby extending the heat exchange time of the refrigerant oil and improving heat exchange efficiency. Furthermore, in the oil return coil 211 spiraling along the axial direction of the housing 141, the refrigerant oil can evenly exchange heat with the chilled water along the axial direction of the housing 141, further improving heat exchange efficiency.

[0058] like Figure 9 As shown, in other specific embodiments, the oil return coil 211 includes multiple refrigeration oil heat exchange tubes 2111 and connecting tubes 2112. The multiple refrigeration oil heat exchange tubes 2111 are arranged at intervals along the circumference of the shell 141. Any two adjacent refrigeration oil heat exchange tubes 2111 are connected by a connecting tube 2112. The oil return coil 211 is arranged in an "S" shape on the side wall of the shell 141. This arrangement provides a longer overall path for the oil return coil 211, which helps extend the heat exchange time of the refrigeration oil and improve heat exchange efficiency. At the same time, the circumferential arrangement of the refrigeration oil heat exchange tubes 2111 can also promote uniform heat exchange between the refrigeration oil and the cold water along the circumference of the shell 141, further improving heat exchange efficiency.

[0059] like Figures 3 to 6 As shown, in an optional embodiment, the oil return circuit 20 includes a first branch 201 and a second branch 202. The first branch 201 is installed between the oil return port 121 of the oil separator 12 and the air intake port 111 of the compressor 11. The second branch 202 is arranged in parallel with the first branch 201. The cooling assembly 21 includes a first cooling assembly and a second cooling assembly. The first branch 201 is connected to the first cooling assembly, and the second branch 202 is connected to the second cooling assembly. That is, the cooling assembly 21 on the first branch is the first cooling assembly, and the cooling assembly 21 on the second branch is the second cooling assembly. At least one of the first branch 201 and the second branch 202 is connected to the oil return port 121. With this arrangement, the refrigerant oil can be cooled after flowing through the first cooling assembly on the first branch 201 and / or the second cooling assembly on the second branch 202. At the same time, the opening and closing of the first branch 201 and the second branch 202 can be selected according to different working conditions, thereby ensuring the normal operation of the cooling or heating working conditions in the main circuit 10 while the refrigeration oil is cooled.

[0060] There are three implementation methods for designing the first branch 201 and the second branch 202, which are described in detail below.

[0061] like Figure 3 and Figure 4As shown, in the first embodiment, the first cooling component is arranged in the first heat exchanger 13; the second cooling component is arranged in the second heat exchanger 14, so that the first heat exchanger 13 and the second heat exchanger 14 can both cool the refrigeration oil without the need for additional heat exchange devices, which is conducive to reducing costs and can be selected for use according to actual conditions, which is more flexible.

[0062] In an optional embodiment, when the main circuit 10 is in cooling mode, the first branch 201 is configured to communicate with the oil return port 121 in response to the cooling mode; the second branch 202 is configured to disconnect from the oil return port 121 in response to the cooling mode; when the main circuit 10 is in heating mode, the first branch 201 is configured to disconnect from the oil return port 121 in response to the heating mode; the second branch 202 is configured to connect to the oil return port 121 in response to the heating mode. The switching method of the first branch 201 and the second branch 202 is as follows:

[0063] like Figure 3 As shown, in a further embodiment, a first control valve 23 is further connected between the inlet of the first branch 201 and the inlet of the first heat exchanger 13 on the first branch 201; a second control valve 24 is further connected between the inlet of the second branch 202 and the inlet of the second heat exchanger 14 on the second branch 202. The first control valve 23 is configured to open and close the first branch 201 in response to the switching mode of the main circuit 10; the second control valve 24 is configured to open and close the second branch 202 in response to the switching mode of the main circuit 10. In this way, the heat exchangers in different branches are switched to exchange heat with the refrigerant oil in the cooling assembly 21 according to the different modes of the main circuit 10, thereby reducing or avoiding the impact on the cooling or heating effect while cooling the refrigerant oil. Furthermore, the switching between the first branch 201 and the second branch 202 can be achieved by adjusting the opening and closing of the first control valve 23 and the second control valve 24, which is easy to operate.

[0064] In a specific embodiment, the main circuit 10 is in cooling mode, the first control valve 23 is configured to be in an open state in response to the cooling mode, and the second control valve 24 is configured to be in a closed state in response to the cooling mode. In this state, the first heat exchanger 13 can cool the refrigeration oil while cooling the high-temperature, high-pressure refrigerant. The refrigeration oil has a small impact on the temperature of the refrigerant output from the first heat exchanger 13. Since the first heat exchanger 13 is far from the second heat exchanger 14, the refrigeration oil does not affect the cooling effect of the refrigerant in the second heat exchanger 14. The water in the second heat exchanger 14 exchanges heat with the air to cool the air, and the second heat exchanger 14 does not participate in heat exchange with the refrigeration oil to ensure the cooling effect. Furthermore, when the main circuit 10 is in heating mode, the first control valve 23 is configured to be closed in response to the heating mode, and the second control valve 24 is configured to be open in response to the heating mode. At this time, the second heat exchanger 14 can cool the refrigeration oil while cooling the high-temperature, high-pressure refrigerant. The hot water produced by the cooling assembly 21 can also increase the heating capacity of the unit, improving the unit's energy efficiency. Furthermore, the refrigeration oil has a small effect on the temperature of the refrigerant output from the second heat exchanger 14. Since the first heat exchanger 13 is relatively far from the second heat exchanger 14, the refrigeration oil will not affect the heating effect of the refrigerant in the first heat exchanger 13. The airflow in the first heat exchanger 13 is relatively high in temperature and is used for heat absorption and evaporation of the refrigerant, but is not suitable for cooling the refrigeration oil.

[0065] In a specific embodiment, the first control valve 23 and the second control valve 24 can be respectively configured as solenoid valves.

[0066] In the present application, the air conditioning system 100 further includes a controller, which is connected to the first control valve 23 and the second control valve 24. After receiving a signal of cooling mode or heating mode, the controller adjusts one of the first control valve 23 and the second control valve 24 to open and the other to close.

[0067] like Figure 4 As shown, in another optional embodiment, the oil return circuit 20 is provided with a third control valve 25, which is connected between the first branch 201 and the second branch 202. The third control valve 25 has an inlet and two outlets, and one of the two outlets of the third control valve 25 is selectively connected to the inlet of the third control valve 25. One of the two outlets of the third control valve 25 is connected to the first branch 201, and the other is connected to the second branch 202. The inlet of the third control valve 25 is connected to the oil return port 121, and the third control valve 25 is selectively connected to either the first branch 201 or the second branch 202. In this way, the switching between the first branch 201 and the second branch 202 can be achieved by adjusting the third control valve 25, which is easy to operate.

[0068] In a further embodiment, when the main circuit 10 is in cooling mode, the inlet of the third control valve 25 is configured to communicate with the first branch 201 in response to the cooling mode. In this case, the first heat exchanger 13 can cool the refrigeration oil while simultaneously cooling the high-temperature, high-pressure refrigerant. Furthermore, when the main circuit 10 is in heating mode, the inlet of the third control valve 25 is configured to communicate with the second branch 202 in response to the heating mode. In this case, the second heat exchanger 14 can cool the refrigeration oil while simultaneously cooling the high-temperature, high-pressure refrigerant. In a specific embodiment, the third control valve 25 is configured as a three-way valve.

[0069] Specifically, the controller is connected to the third control valve 25. After receiving a signal of the cooling mode or the heating mode, the controller adjusts the inlet of the third control valve 25 to connect with one of the branches and disconnects the other branch.

[0070] like Figure 5 As shown, in the second embodiment, a third heat exchanger 31 is connected to the first branch 201, and a first cooling component is arranged in the third heat exchanger 31. The refrigeration oil in the first cooling component is cooled by the third heat exchanger 31; the second cooling component is arranged in the second heat exchanger 14. With this arrangement, on the first branch 201, the third heat exchanger 31 does not participate in the cooling and heating cycle of the main circuit 10, has no effect on the working conditions of the main circuit 10, and is conducive to the normal operation of the main circuit 10. On the second branch 202, the refrigeration oil in the second cooling component is still cooled by the second heat exchanger 14 without using additional heat exchange equipment, so as to reduce equipment costs. Among them, the third heat exchanger 31 can be an air-cooled heat exchanger or a water-cooled heat exchanger, which is not specifically limited here.

[0071] like Figure 5 As shown, in actual application, the first branch 201 can be kept normally open, and a fourth control valve 26 can be provided on the second branch 202 to control the connection and disconnection between the second branch 202 and the oil return port 121 . For example, when the main circuit 10 is in the heating mode, the fourth control valve 26 is configured to open in response to the heating mode of the main circuit 10, and the cold water in the second heat exchanger 14 exchanges heat with the high-temperature refrigerant while also exchanging heat and cooling the refrigeration oil. At this time, both the first branch 201 and the second branch 202 can circulate the refrigeration oil; when the main circuit 10 is in the cooling mode, the fourth control valve 26 is configured to close in response to the cooling mode of the main circuit 10. At this time, the second branch 202 is disconnected from the return oil port 121, and the second heat exchanger 14 is only used for heat exchange of the refrigerant. After the low-temperature refrigerant absorbs the hot water in the second heat exchanger 14, the second heat exchanger 14 outputs cold water to the outside. The cold water fully absorbs the heat in the air to achieve cooling, so that the air-conditioning system is not affected by the heat exchange of the refrigeration oil.

[0072] like Figure 6 As shown, in the third embodiment, a fourth heat exchanger 32 is connected to the second branch 202, a second cooling assembly is provided in the fourth heat exchanger 32, and the refrigerant oil in the second cooling assembly is cooled by the fourth heat exchanger 32; the first cooling assembly is provided in the first heat exchanger 13. With this arrangement, on the second branch 202, the fourth heat exchanger 32 does not participate in the cooling and heating cycle of the main circuit 10, has no effect on the working conditions of the main circuit 10, and is conducive to the normal operation of the main circuit 10. On the first branch 201, the refrigerant oil in the first cooling assembly is still cooled by the first heat exchanger 13 without using additional heat exchange equipment, so as to reduce equipment costs. Among them, the fourth heat exchanger 32 can be an air-cooled heat exchanger or a water-cooled heat exchanger, which is not specifically limited here.

[0073] In actual application, the second branch 202 can be kept normally open, and a fifth control valve 27 can be provided on the first branch 201 to control the connection between the first branch 201 and the oil return port 121. For example, when the main circuit 10 is in the heating mode, the fifth control valve 27 is configured to close in response to the heating mode of the main circuit 10. At this time, only high-temperature airflow flows through the first heat exchanger 13, which is unable to heat exchange and cool the refrigerant oil. Therefore, the first heat exchanger 13 is only used for heat exchange with the refrigerant. When the main circuit 10 is in the cooling mode, the fifth control valve 27 is configured to open in response to the cooling mode of the main circuit 10. Low-temperature airflow flows through the first heat exchanger 13, which can heat exchange and cool the refrigerant oil while simultaneously exchanging heat with the high-temperature refrigerant. At this time, both the first branch 201 and the second branch 202 can flow refrigerant oil.

[0074] Based on the above-mentioned use of the first heat exchanger 13 and / or the second heat exchanger 14 to cool the refrigerant oil, in a further embodiment, the inlet pipe of the first heat exchanger 13 and / or the inlet pipe of the second heat exchanger 14 are arranged in parallel with the return oil coil 211 in the cooling assembly 21; in heating mode, the inlet pipe of the first heat exchanger 13 can absorb the heat of the refrigerant oil in the return oil coil 211; in cooling mode, the inlet pipe of the second heat exchanger 14 can absorb the heat of the refrigerant oil in the return oil coil 211. In heating mode, low-temperature refrigerant flows through the inlet pipe of the first heat exchanger 13; in cooling mode, low-temperature refrigerant flows through the inlet pipe of the second heat exchanger 14. By utilizing the low-temperature refrigerant to absorb the heat of the refrigerant oil, the refrigerant oil can also be cooled.

[0075] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0076] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of patent protection for the present application shall be determined by the appended claims.

Claims

1. An air conditioning system, characterized in that: The air conditioning system comprises: A main circuit (10), the main circuit (10) comprising a compressor (11), an oil separator (12), a first heat exchanger (13) and a second heat exchanger (14) connected in sequence, the compressor (11) being provided with an air intake (111) and an air discharge port (112) spaced apart, the air intake of the oil separator (12) being connected to the air discharge port (112) of the compressor (11); An oil return circuit (20), wherein the inlet of the oil return circuit (20) is connected to the oil return port (121) of the oil separator (12), and the outlet of the oil return circuit (20) is connected to the air intake port (111) of the compressor (11); a cooling component (21) is provided on the oil return circuit (20), and the cooling component (21) is connected between the oil return port (121) and the air intake port (111); At least one of the first heat exchanger (13) and the second heat exchanger (14) is provided with the cooling component (21), and the refrigeration oil in the cooling component (21) can be cooled by the first heat exchanger (13) and / or the second heat exchanger (14).

2. The air conditioning system according to claim 1, characterized in that The first heat exchanger (13) is an air-cooled heat exchanger, which cools the refrigeration oil by air cooling; and / or the second heat exchanger (14) is a water-cooled heat exchanger, which cools the refrigeration oil by water cooling.

3. The air conditioning system according to claim 2, characterized in that The oil return circuit (20) comprises a first branch (201) and a second branch (202), wherein the first branch (201) is located between the oil return port (121) of the oil separator (12) and the air intake port (111) of the compressor (11); and the second branch (202) is arranged in parallel with the first branch (201). The cooling assembly (21) comprises a first cooling assembly and a second cooling assembly, the first branch (201) is connected to the first cooling assembly, and the second branch (202) is connected to the second cooling assembly; the first cooling assembly is arranged on the first heat exchanger (13); and the second cooling assembly is arranged on the second heat exchanger (14).

4. The air conditioning system according to claim 2, characterized in that The oil return circuit (20) comprises a first branch (201) and a second branch (202), wherein the first branch (201) is located between the oil return port (121) of the oil separator (12) and the air intake port (111) of the compressor (11); and the second branch (202) is arranged in parallel with the first branch (201). The cooling assembly (21) comprises a first cooling assembly and a second cooling assembly; The first branch (201) is connected to a third heat exchanger (31), the third heat exchanger (31) is provided with the first cooling component, and the refrigeration oil in the first cooling component is cooled by the third heat exchanger (31); the second cooling component is provided in the second heat exchanger (14); or, the second branch (202) is connected to a fourth heat exchanger (32), the fourth heat exchanger (32) is provided with the second cooling component, and the refrigeration oil in the second cooling component is cooled by the fourth heat exchanger (32); the first cooling component is provided in the first heat exchanger (13).

5. The air conditioning system according to claim 3, characterized in that The first branch (201) is provided with a first control valve (23), and the second branch (202) is provided with a second control valve (24); the first control valve (23) is configured to open and close the first branch (201) in response to a switching mode of the main circuit (10), and the second control valve (24) is configured to open and close the second branch (202) in response to a switching mode of the main circuit (10); or, The oil return circuit (20) is provided with a third control valve (25), the third control valve (25) having an inlet and two outlets, one of the two outlets of the third control valve (25) being in communication with the first branch (201), and the other being in communication with the second branch (202), the inlet of the third control valve (25) being in communication with the oil return port (121), and the third control valve (25) selectively being in communication with either the first branch (201) or the second branch (202).

6. The air conditioning system according to claim 5, characterized in that The main circuit (10) is in cooling mode, the first branch (201) is configured to communicate with the oil return port (121) in response to the cooling mode; the second branch (202) is configured to disconnect from the oil return port (121) in response to the cooling mode; The main circuit (10) is in a heating mode, the first branch (201) is configured to disconnect from the oil return port (121) in response to the heating mode, and the second branch (202) is configured to communicate with the oil return port (121) in response to the heating mode.

7. The air conditioning system according to any one of claims 2 to 6, characterized in that: The cooling assembly (21) includes an oil return coil (211) connected between the oil return port (121) and the air intake port (111).

8. The air conditioning system according to claim 7, characterized in that The air-cooled heat exchanger comprises a fan (132) and a first heat exchange tube group (131) arranged at intervals. The fan (132) and the oil return coil (211) are arranged at intervals relative to each other along a first direction. Along the first direction, the first heat exchange tube group (131) is located between the fan (132) and the oil return coil (211). Along the second direction, the first heat exchange tube group (131) is provided on both sides of the fan (132). When the fan (132) is in operation, at least part of the airflow generated flows through the oil return coil (211).

9. The air conditioning system according to claim 7, characterized in that The water-cooled heat exchanger comprises a shell (141) and a second heat exchange tube group, wherein the second heat exchange tube group is installed in the shell (141), a refrigerant flows in the second heat exchange tube group, and water for exchanging heat with the refrigerant flows between the shell (141) and the second heat exchange tube group; the oil return coil (211) is attached to the side wall of the shell (141).

10. The air conditioning system according to claim 9, characterized in that The oil return coil (211) is spirally wound around the side wall of the shell (141) along the axial direction of the shell (141); or, the oil return coil (211) includes a plurality of refrigeration oil heat exchange tubes (2111) and connecting tubes (212), the plurality of refrigeration oil heat exchange tubes (2111) are arranged at intervals along the circumference of the shell (141), any two adjacent refrigeration oil heat exchange tubes (2111) are connected by the connecting tube (212), and the oil return coil (211) is arranged in an "S" shape on the side wall of the shell (141).

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