Lubricating oil separating device and refrigerating system

Abstract

The utility model relates to a lubricating oil separating device and a refrigerating system, and the lubricating oil separating device comprises a shell (1); the partition plate (2) is arranged in the shell (1) and divides the space in the shell (1) into an upper cavity (21) and a lower cavity (22), the upper cavity (21) is used for separating lubricating oil and a second refrigerant mixture from the first refrigerant mixture, and the lower cavity (22) is used for storing the lubricating oil; the one-way flowing mechanism (3) is configured to selectively allow the lubricating oil to flow from the upper cavity (21) to the lower cavity (22) in a one-way mode; wherein the first opening (11) is used for allowing a first refrigerant mixture to flow into the upper cavity (21), the second opening (12) is used for allowing a second refrigerant mixture to flow out of the upper cavity (21), the third opening (13) is used for allowing lubricating oil in the upper cavity (21) to flow out, and the fourth opening (14) is used for selectively allowing lubricating oil in the lower cavity (22) to flow out.

Description

Technical Field

[0001] The present disclosure relates to the technical field of refrigeration systems, and in particular, to an oil separation device and a refrigeration system. Background Art

[0002] Currently, with the development of air-conditioning technology, the cooling capacity design of air conditioners is getting larger and larger, and the corresponding circulating refrigerant volume in the system increases accordingly. The lowest operating range of the air conditioner has reached -30°C or even lower. During operation at extremely low temperatures, it is found that the compressor will have a problem of serious oil shortage for a short time. At the same time, under non-extreme operating conditions of the system, the demand for lubricating oil is relatively small. If more lubricating oil is supplied, it will also lead to a decrease in the heat exchange efficiency of the system and an increase in power consumption. Summary of the Utility Model

[0003] Embodiments of the present disclosure provide an oil separation device and a refrigeration system, which can improve the adaptability of lubricating oil supply to different working conditions.

[0004] According to a first aspect of the present disclosure, an oil separation device is provided, including:

[0005] A housing, on which a first opening, a second opening, a third opening, and a fourth opening are provided;

[0006] A partition plate, arranged in the housing and separating the space in the housing into an upper chamber and a lower chamber. The upper chamber is used to separate lubricating oil and a second refrigerant mixture from a first refrigerant mixture, and the lower chamber is used to store lubricating oil; and

[0007] A one-way flow mechanism, configured to selectively allow the lubricating oil to flow unidirectionally from the upper chamber to the lower chamber;

[0008] Wherein, the first opening is used for the first refrigerant mixture to flow into the upper chamber, the second opening is used for the second refrigerant mixture to flow out of the upper chamber, the third opening is used for the lubricating oil in the upper chamber to flow out, and the fourth opening is used to selectively allow the lubricating oil in the lower chamber to flow out.

[0009] In some embodiments, the one-way flow mechanism includes:

[0010] A one-way valve, arranged on the partition plate. The one-way valve is configured to allow the lubricating oil to flow unidirectionally only from the upper chamber to the lower chamber, and the inlet of the one-way valve is higher than the third opening.

[0011] In some embodiments, the one-way flow mechanism further includes:

[0012] A first connecting pipeline, arranged outside the housing and connected between the upper chamber and the lower chamber; and

[0013] The first on-off valve is provided on the first connecting pipeline and is configured to control the on-off of the first connecting pipeline, and prevent the one-way valve from opening in the off state, and balance the air pressures in the upper chamber and the lower chamber in the on state to allow the one-way valve to open.

[0014] In some embodiments, the partition plate protrudes towards the upper chamber.

[0015] In some embodiments, the one-way flow mechanism includes a one-way valve. The one-way valve is provided at the highest position of the protruding portion of the partition plate and is configured to only allow the lubricating oil to flow unidirectionally from the upper chamber to the lower chamber. The inlet of the one-way valve is higher than the third opening.

[0016] In some embodiments, the lubricating oil separation device further includes a centrifugal separation mechanism provided in the upper chamber. The first opening is located on the side wall of the housing close to the top surface, the second opening is located on the top surface of the housing, the third opening is located on the side wall of the housing and in the bottom area of the upper chamber, and the fourth opening is located on the bottom surface of the housing.

[0017] According to a second aspect of the present disclosure, there is provided a refrigeration system, including:

[0018] A compressor;

[0019] An indoor heat exchanger and an outdoor heat exchanger; and

[0020] The lubricating oil separation device of the above embodiments, the first opening is communicated with the exhaust port of the compressor, the second opening is selectively communicated with the indoor heat exchanger or the outdoor heat exchanger, and the third opening and the fourth opening are both selectively communicated with the intake port of the compressor.

[0021] In some embodiments, the refrigeration system further includes:

[0022] A second connecting pipeline, connected between the third opening and the intake port of the compressor; and

[0023] A second on-off valve, provided on the second connecting pipeline and configured to be in the on state when the compressor starts and in the off state when the compressor stops.

[0024] In some embodiments, the refrigeration system further includes:

[0025] A third connecting pipeline, connected between the fourth opening and the intake port of the compressor; and

[0026] A third on-off valve, provided on the third connecting pipeline and configured to control the on-off of the third connecting pipeline.

[0027] In some embodiments,

[0028] When the compressor is operating under an oil-rich condition, the one-way flow mechanism is configured to allow the lubricating oil to flow unidirectionally from the upper chamber to the lower chamber, and the third on-off valve is in an off state so that the excess lubricating oil in the upper chamber is stored in the lower chamber;

[0029] When the compressor is operating under an oil-poor condition, the one-way flow mechanism is configured to prevent the lubricating oil from flowing from the upper chamber to the lower chamber, and the third on-off valve is in an on state so that the lubricating oil stored in the lower chamber is replenished to the intake port of the compressor.

[0030] In some embodiments, the refrigeration system further includes:

[0031] A gas-liquid separation device provided upstream of the compressor; and

[0032] A mode switching valve group configured to switch the refrigeration system between a heating mode and a cooling mode. In the heating mode, the second opening communicates with the indoor heat exchanger, and the outlet of the outdoor heat exchanger communicates with the gas-liquid separation device; in the cooling mode, the second opening communicates with the outdoor heat exchanger, and the outlet of the indoor heat exchanger communicates with the gas-liquid separation device.

[0033] Based on the above technical solutions, the lubricating oil separation device of the embodiments of the present disclosure has a compact structure and can separate lubricating oil from the first refrigerant mixture; the one-way flow mechanism selectively allows the lubricating oil to flow unidirectionally from the upper chamber to the lower chamber, and can store the excess lubricating oil in the lower chamber when the lubricating oil demand component is operating under an oil-rich condition, and can release the lubricating oil stored in the lower chamber when the lubricating oil demand component is operating under an oil-poor condition to replenish the lubricating oil to the lubricating oil demand component, which can improve the adaptability of the lubricating oil separation device to different lubricating oil supply demand situations; separate and store higher-quality lubricating oil for subsequent use under an oil-rich operating condition, and provide a better lubrication effect under an oil-poor operating condition. Description of the Drawings

[0034] The drawings described herein are used to provide a further understanding of the present disclosure, form a part of this application, and the illustrative embodiments and descriptions of the present disclosure are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the drawings:

[0035] Figure 1 It is a schematic structural diagram of some embodiments inside the oil separation device of the present disclosure.

[0036] Figure 2 It is a schematic composition diagram of some embodiments when the refrigeration system of the present disclosure is operating in the heating mode.

[0037] Figure 3 It is a schematic composition diagram of some embodiments when the refrigeration system of the present disclosure is operating in the cooling mode.

[0038] Description of the Reference Numerals

[0039] 1. Housing; 2. Partition board; 3. Unidirectional flow mechanism; 4. Lubricating oil separation device; 5. Compressor; 61. Indoor heat exchanger; 62. Outdoor heat exchanger; 63. First throttling component; 64. Second throttling component; 7. Gas-liquid separation device; 8. Mode switching valve group; 11. First opening; 12. Second opening; 13. Third opening; 14. Fourth opening; 21. Upper chamber; 22. Lower chamber; 31. Check valve; 100. First connecting pipeline; 101. First on-off valve; 200. Second connecting pipeline; 201. First capillary tube section; 202. Second on-off valve; 300. Third connecting pipeline; 301. Second capillary tube section; 303. Third on-off valve. Detailed implementation manners

[0040] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and in no way limits the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that: Unless otherwise specifically stated, the relative arrangements of components and steps, the components of materials, numerical expressions and values set forth in these embodiments should be construed as merely exemplary and not as limitations.

[0041] The "first", "second" and similar terms used in the present disclosure do not denote any order, quantity or importance, but are only used to distinguish different parts. Words such as "comprising" or "including" mean that the elements before the word cover the elements listed after the word, and do not exclude the possibility of also covering other elements. "Upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0042] In the present disclosure, when it is described that a specific device is located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When it is described that a specific device is connected to other devices, the specific device may be directly connected to the other devices without an intermediate device, or may not be directly connected to the other devices and have an intermediate device.

[0043] All terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by those of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, for example, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense, unless specifically defined as such here.

[0044] Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and devices should be regarded as part of the specification.

[0045] Based on the various embodiments of the present disclosure above, in the absence of an explicit negation or conflict, the technical features of one embodiment can be beneficially combined with one or more other embodiments.

[0046] First, the present disclosure provides a lubricating oil separation device, as Figures 1 to 3 shown, for separating lubricating oil and a second refrigerant mixture from a first refrigerant mixture. The lubricating oil separation device includes:

[0047] A housing 1, provided with a first opening 11, a second opening 12, a third opening 13, and a fourth opening 14 thereon;

[0048] A partition plate 2, disposed within the housing 1 and dividing the space within the housing 1 into an upper chamber 21 and a lower chamber 22. The upper chamber 21 is used to separate lubricating oil and a second refrigerant mixture from the first refrigerant mixture, and the lower chamber 22 is used to store lubricating oil; and

[0049] A one-way flow mechanism 3, configured to selectively allow lubricating oil to flow unidirectionally from the upper chamber 21 to the lower chamber 22;

[0050] Wherein, the first opening 11 is for allowing the first refrigerant mixture to flow into the upper chamber 21, the second opening 12 is for allowing the second refrigerant mixture to flow out of the upper chamber 21, the third opening 13 is for allowing the lubricating oil in the upper chamber 21 to flow out, and the fourth opening 14 is for selectively allowing the lubricating oil in the lower chamber 22 to flow out.

[0051] Specifically, a lubricating oil separation mechanism is provided within the upper chamber 21, configured to separate lubricating oil from the first refrigerant mixture flowing in from the first opening 11. Optionally, the lubricating oil separation mechanism can be a centrifugal lubricating oil separation structure, or can also be other lubricating oil separation structures such as a filtration type, a packing type, or a washing type.

[0052] The lubricating oil accumulates in the bottom area of the upper chamber 21 under the action of gravity, and the second refrigerant mixture after separating the lubricating oil flows out through the second opening 12. The first refrigerant mixture and the second refrigerant mixture are mixtures containing lubricating oil, liquid refrigerant and gaseous refrigerant, and the separated lubricating oil may also include liquid refrigerant. The lubricating oil is also called refrigeration oil.

[0053] The lubricating oil separated by the lubricating oil separation device can be supplied to lubricating oil demand components, such as compressors, etc. The first opening 11 communicates with the upper chamber 21 and is used to mix the high-temperature and high-pressure refrigerant and lubricating oil discharged from the compressor into the upper chamber 21; the second opening 12 communicates with the upper chamber 21 and is used to discharge the high-temperature and high-pressure refrigerant and a small amount of lubricating oil after separation from the upper chamber 21; the third opening 13 communicates with the lower chamber 22 and is used to discharge the separated lubricating oil from the lower chamber 22 to enter the compressor to play a lubricating role; the fourth opening 14 communicates with the lower chamber 22 and is used to discharge the separated lubricating oil from the lower chamber 22 under specific circumstances.

[0054] Specifically, the outlet of the lubricating oil demand component such as the compressor outputs the first refrigerant mixture, and the lubricating oil separated from the first refrigerant mixture flows through the third opening 13 to the inlet of the lubricating oil demand component. When the lubricating oil demand component is in a rich oil operating condition, the one-way flow mechanism 3 allows the lubricating oil to flow unidirectionally from the upper chamber 21 to the lower chamber 22, and the excess lubricating oil in the upper chamber 21 is stored in the lower chamber 22, and the fourth opening 14 can be closed, and the lubricating oil is not supplemented to the inlet of the lubricating oil demand component through the fourth opening 14, or the opening degree of the fourth opening 14 can be reduced to reduce the lubricating oil supplemented to the inlet of the lubricating oil demand component through the fourth opening 14. When the lubricating oil demand component is in a lean oil operating condition, the one-way flow mechanism 3 prevents the lubricating oil from flowing unidirectionally from the upper chamber 21 to the lower chamber 22, the fourth opening 14 is opened, and the lubricating oil stored in the lower chamber 22 is supplemented to the inlet of the lubricating oil demand component through the fourth opening 14.

[0055] Specifically, when the lubricating oil demand component is in a rich oil operating condition, the proportion of the liquid refrigerant in the first refrigerant mixture is small, the lubricating oil separation efficiency of the lubricating oil separation device increases, and at the same time, the liquid refrigerant dissolved in the lubricating oil is less, the purity of the lubricating oil is high, the proportion of pure lubricating oil per unit volume is large, and the quality of the lubricating oil increases. At this time, the lubricating effect of the stored lubricating oil is better. When the lubricating oil demand component is in a lean oil operating condition, the proportion of the liquid refrigerant in the first refrigerant mixture is large, the lubricating oil separation efficiency of the lubricating oil separation device decreases, and at the same time, the liquid refrigerant dissolved in the lubricating oil is more, and the quality of the lubricating oil decreases. At this time, supplementing high-quality lubricating oil to the lubricating oil demand component can not only supplement the lubricating oil, but also improve the lubricating effect.

[0056] Specifically, the one-way flow mechanism 3 selectively allows the lubricating oil to flow unidirectionally from the upper chamber 21 to the lower chamber 22, which means that the one-way flow mechanism 3 can actively control whether to allow the lubricating oil to be replenished into the lower chamber 22, not only depending on the liquid level height of the lubricating oil. For example, even if the liquid level height of the lubricating oil is higher than the inlet of the check valve, the flow of the lubricating oil into the lower chamber 22 can be prohibited.

[0057] Optionally, the one-way flow control of the one-way flow mechanism 3 can be achieved by setting a combination of a flow channel and an on-off valve, or by adjusting the pressure difference between the upper chamber 21 and the lower chamber 22, or by any other flow direction control structure such as a check valve.

[0058] The lubricating oil separation device of this embodiment has a compact structure and can separate the lubricating oil from the first refrigerant mixture. The one-way flow mechanism 3 selectively allows the lubricating oil to flow unidirectionally from the upper chamber 21 to the lower chamber 22. Under the condition of not needing to replenish the lubricating oil to the external system, the excess lubricating oil can be stored in the independent lower chamber 22. Compared with the lubricating oil separation device with only one chamber, it can prevent the first refrigerant mixture introduced from impacting the separated lubricating oil, thereby avoiding the lubricating oil being discharged from the lubricating oil separation device along with the second refrigerant mixture and entering the system, and optimizing the storage effect of the lubricating oil.

[0059] Furthermore, when the lubricating oil demand component is in a rich oil operation condition, the excess lubricating oil can be stored in the lower chamber 22, so as to separate and store higher-quality lubricating oil for subsequent use; when the lubricating oil demand component is in a lean oil operation condition, the lubricating oil stored in the lower chamber 22 can be released to replenish the lubricating oil to the lubricating oil demand component, thereby providing a better lubrication effect. Thus, the lubricating oil separation device can improve the adaptability of the lubricating oil separation device to different lubricating oil supply demand situations.

[0060] In some embodiments, as Figure 1 shown, the one-way flow mechanism 3 includes:

[0061] A check valve 31 is provided on the partition plate 2. The check valve 31 is configured to allow the lubricating oil to flow unidirectionally only from the upper chamber 21 to the lower chamber 22, and the inlet of the check valve 31 is higher than the third opening 13.

[0062] Specifically, the check valve 31 is provided in the housing 1. The inlet of the check valve 31 communicates with the upper chamber 21, and the outlet of the check valve 31 communicates with the lower chamber 22. The check valve 31 can be a check valve or the like. Optionally, the selective unidirectional flow of the lubricating oil from the upper chamber 21 to the lower chamber 22 can be achieved by an on-off valve such as a solenoid valve, or by the pressure difference between the upper and lower chambers.

[0063] Specifically, the liquid level height H where the inlet of the one-way valve 31 is located is higher than the third opening 13, so that after the lubricating oil reaches the upper chamber 21, it preferentially flows out through the third opening 13 to meet the normal requirements of the lubricating oil demand components. The excess lubricating oil under the rich oil operating condition raises the liquid level in the upper chamber 21. When the lubricating oil liquid level is greater than or equal to the liquid level height H, the lubricating oil flows unidirectionally from the upper chamber 21 to the lower chamber 22.

[0064] In this embodiment, by providing a one-way valve 31 on the partition plate 2 to control the unidirectional flow of the lubricating oil, the flow path of the lubricating oil can be controlled in a timely and efficient manner; the height area between the third opening 13 of the upper chamber and the inlet of the one-way valve 31 forms a buffer chamber, which can not only meet the normal requirements of the lubricating oil demand components for the lubricating oil in real time, but also store the excess lubricating oil in the lower chamber 22 through the one-way valve 31 under the rich oil operating condition, improving the operating condition adaptability of the lubricating oil supply.

[0065] In some embodiments, as Figure 1 shown, the unidirectional flow mechanism 3 further includes:

[0066] A first connecting pipe 100, provided outside the housing 1 and connected between the upper chamber 21 and the lower chamber 22; and

[0067] A first on-off valve 101, provided on the first connecting pipe 100, configured to control the on-off of the first connecting pipe 100, and prevent the one-way valve 31 from opening in the off state, and balance the air pressures in the upper chamber 21 and the lower chamber 22 in the on state to allow the one-way valve 31 to open.

[0068] Specifically, under the rich oil operating condition, the first on-off valve 101 is opened, the first connecting pipe 100 is connected, and the pressures in the upper chamber 21 and the lower chamber 22 are balanced at all times. When the lubricating oil liquid level in the upper chamber 21 is higher than the liquid level height H, the excess lubricating oil in the upper chamber 21 will automatically enter the lower chamber 22 through the one-way valve 31 due to the influence of gravity; when the lubricating oil liquid level in the upper chamber 21 is lower than the liquid level height H, the oil storage action ends automatically.

[0069] Specifically, under the condition of insufficient lubricating oil, the first on-off valve 101 is closed, the first connecting pipe 100 is disconnected, and even if the lubricating oil liquid level in the upper chamber 21 is higher than the liquid level height H, due to the limited compressibility of the air pressure in the lower chamber 22, the lubricating oil in the upper chamber 21 cannot enter the lower chamber 22.

[0070] In this embodiment, the upper and lower chambers are connected by a first connecting pipeline 100 provided outside the housing 1, and the first on-off valve 101 controls the on-off of the first connecting pipeline 100, which can adjust the air pressure difference between the upper and lower chambers. Furthermore, the working state of the one-way valve 31 can be selectively controlled, and the flow path of the lubricating oil can be efficiently controlled according to the working conditions, ensuring the effective recovery and replenishment of the lubricating oil and improving the adaptability of the lubricating oil supply to the working conditions.

[0071] In some embodiments, as Figures 1 to 3 shown, the partition plate 2 protrudes towards the upper chamber 21.

[0072] Specifically, the circumferential shape of the partition plate 2 is adapted to the shape of the housing 1. For example, when the shape of the housing 1 is cylindrical, the circumferential shape of the partition plate 2 is circular; when the shape of the housing 1 is square cylindrical, the circumferential shape of the partition plate 2 is rectangular. Optionally, the central region of the partition plate 2 protrudes towards the upper chamber 21. For example, the partition plate 2 can be an arc-shaped plate, etc.

[0073] In this embodiment, since the partition plate 2 protrudes towards the upper chamber 21, the effective volume of the lower chamber 22 can be guaranteed, the maximum storage capacity of the lubricating oil in the lower chamber 22 can be increased, the adaptability of the lubricating oil separation device to extreme working conditions can be improved, and further the adaptability of the lubricating oil supply to the working conditions can be improved.

[0074] In some embodiments, as Figures 1 to 3 shown, the one-way flow mechanism 3 includes a one-way valve 31. The one-way valve 31 is provided at the highest position of the protruding part of the partition plate 2 and is configured to only allow the lubricating oil to flow unidirectionally from the upper chamber 21 to the lower chamber 22. The inlet of the one-way valve 31 is higher than the third opening 13.

[0075] In this embodiment, by arranging the one-way valve 31 at the highest position of the protruding part of the partition plate 2, the buffer chamber between the third opening 13 in the upper chamber 21 and the inlet of the one-way valve 31 can be fully utilized, maximizing the volume of the buffer chamber to achieve the combination of short-time buffering of the lubricating oil in the buffer chamber and long-time storage in the lower chamber 22, and further improving the adaptability of the lubricating oil supply to the working conditions.

[0076] In some embodiments, as Figure 1 shown, the first opening 11 and the second opening 12 are located in the top region of the housing 1, the third opening 13 is located on the side wall of the housing 1 and in the bottom region of the upper chamber 21, and the fourth opening 14 is located in the bottom region of the housing 1.

[0077] Specifically, the first opening 11 is located in the top region of the housing 1 to facilitate the inflow of the first refrigerant mixture with the main body being gaseous refrigerant. The second opening 12 is located in the top region of the housing 1 to facilitate the timely outflow of the second refrigerant mixture with the main body being gaseous refrigerant. The third opening 13 is located in the bottom region of the upper chamber 21, and the fourth opening 14 is located in the bottom region of the housing 1, both facilitating the outflow of the lubricating oil liquid under the action of gravity, and ensuring the timeliness and smoothness of the lubricating oil supply.

[0078] Optionally, the first opening 11 can be located on the side surface of the housing 1 or on the top surface of the housing 1. When the first opening 11 is located on the top surface of the housing 1, a certain diversion angle needs to be added at the entrance to avoid the high-speed airflow directly impacting the lubricating oil separation mechanism and causing disturbance, which affects the lubricating oil separation effect.

[0079] By optimizing the layout positions of the openings on the housing 1 in this embodiment, it can be ensured that both the refrigerant mixture and the lubricating oil flow smoothly in the lubricating oil separation device, minimizing the disturbance of the lubricating oil at the bottom of the upper chamber 21 caused by the first refrigerant mixture entering the upper chamber 21, and improving the lubricating oil separation efficiency and supply efficiency of the lubricating oil separation device.

[0080] In some embodiments, as Figure 1 shown, the lubricating oil separation device further includes a centrifugal separation mechanism disposed in the upper chamber 21. The first opening 11 is located on the side wall of the housing 1 near the top surface, the second opening 12 is located on the top surface of the housing 1, and the fourth opening 14 is located on the bottom surface of the housing 1.

[0081] Specifically, the lubricating oil separation device 4 can separate the first refrigerant mixture through the centrifugal lubricating oil separation mechanism. The first opening 11 being located on the side wall of the housing 1 near the top surface can utilize the centrifugal force of the high-speed inflow of the refrigerant mixture to accelerate the oil-gas separation and improve the lubricating oil separation effect. Similarly, the third opening 13 is disposed on the top surface of the housing 1, enabling the second refrigerant mixture separated from the first refrigerant mixture to flow out through the second opening 12 in a timely manner, thereby avoiding the excessive accumulation of gaseous refrigerant and reducing the lubricating oil separation efficiency.

[0082] Specifically, the fourth opening 14 is located on the bottom surface of the housing 1, enabling the lubricating oil stored in the lower chamber 22 to flow out through the fourth opening 14 in a timely manner. Even when the amount of lubricating oil stored in the lower chamber 22 is small, it can flow out smoothly and be replenished to the inlet of the lubricating oil demand component, further improving the working condition adaptability of the lubricating oil supply.

[0083] For the centrifugal lubricating oil separation mechanism in this embodiment, since the first refrigerant mixture needs to enter the lubricating oil separation mechanism tangentially, by further optimizing the positions of the first opening 11, the second opening 12, and the fourth opening 14 relative to the housing 1, the lubricating oil separation efficiency of the lubricating oil separation device can be improved, and the lubricating oil supply efficiency and the working condition adaptability of the lubricating oil supply can be enhanced.

[0084] During the research process, the inventors also found that when the refrigeration system operates under extreme conditions, when the compressor 5 has insufficient exhaust superheat, the proportion of liquid refrigerant in the gaseous refrigerant at the outlet of the compressor 5 is relatively high, and a large amount of liquid lubricating oil will dissolve in the liquid refrigerant, resulting in a decrease in the separation efficiency of the pure lubricating oil part of the lubricating oil separation device. At the same time, there is a lot of liquid refrigerant dissolved in the lubricating oil, and the quality of the lubricating oil decreases; when the refrigeration system operates under non-extreme conditions, too much lubricating oil adheres to the heat exchange tubes, resulting in an increase in thermal resistance and power consumption. However, at the same time, the proportion of liquid refrigerant in the gaseous refrigerant at the outlet of the compressor 5 is relatively small, the separation efficiency of the pure lubricating oil part of the lubricating oil separation device increases, and there is less liquid refrigerant dissolved in the lubricating oil, and the quality of the lubricating oil increases. At this time, the lubricating effect of the stored lubricating oil is better.

[0085] When the refrigeration system operates under extreme conditions, most of the refrigerant in the refrigeration system cannot be fully evaporated and will accumulate in the gas-liquid separator or pipeline configured in the air-conditioning system. During the startup process of the compressor, the exhaust superheat will be insufficient due to liquid carryover during suction. When the exhaust superheat is insufficient, a large amount of lubricating oil will dissolve in the liquid refrigerant. Therefore, the oil discharge amount of the compressor increases sharply during operation. On the other hand, it will also cause a significant decrease in the separation efficiency of the pure lubricating oil part and the refrigerant of the oil separator, resulting in a decrease in the quality of the lubricating oil returned from the lubricating oil separator to the compressor and not meeting the oil supply demand, and it is very easy to have a serious shortage of oil in the compressor in a short time.

[0086] When the refrigeration system operates under non-extreme conditions, too much lubricating oil will enter the system pipeline along with the refrigerant, resulting in lubricating oil adhering to the heat exchange tubes in some heat exchange components, increasing the thermal resistance, reducing the system heat exchange efficiency, and increasing the power consumption.

[0087] Therefore, the present disclosure also proposes a refrigeration system, whose lubricating oil demand component is a compressor, as Figure 2 and Figure 3 shown, the refrigeration system includes:

[0088] Compressor 5;

[0089] Indoor heat exchanger 61 and outdoor heat exchanger 62; and

[0090] The lubricating oil separation device 4 of the above embodiment, the first opening 11 communicates with the exhaust port of the compressor 5, the second opening 12 can be selectively communicated with the indoor heat exchanger 61 or the outdoor heat exchanger 62, and the third opening 13 and the fourth opening 14 can both be selectively communicated with the intake port of the compressor 5.

[0091] Specifically, the outlet of the compressor 5 outputs a first refrigerant mixture, and the lubricating oil separated from the first refrigerant mixture flows to the inlet of the compressor 5 through the third opening 13. Under the rich oil operating condition of the compressor 5, the excess lubricating oil is stored in the lower chamber 22. Under the lean oil operating condition of the compressor 5, the lubricating oil stored in the lower chamber 22 is supplied to the inlet of the compressor 5 through the fourth opening 14 to supplement the lubricating oil.

[0092] Specifically, when the refrigeration system operates under non-extreme conditions, the lubricating oil of the compressor 5 is abundant, the separation efficiency of the pure lubricating oil part of the lubricating oil separation device 4 is high, and the quality of the lubricating oil is high. At this time, the lubricating oil separation device 4 stores high-quality lubricating oil, which can produce better lubricating effects subsequently and will not cause problems such as increased thermal resistance and increased power consumption.

[0093] Specifically, when the refrigeration system operates under extreme conditions such as minus 30 degrees Celsius, the lubricating oil of the compressor 5 is lacking, the separation efficiency of the pure lubricating oil part of the lubricating oil separation device 4 is low, and the quality of the lubricating oil is low. At this time, the fourth opening 14 is connected to the intake port of the compressor 5, and the lubricating oil separation device 4 supplies high-quality lubricating oil to the inlet of the compressor 5, which can not only supplement the lubricating oil according to the working conditions but also improve the lubricating effect.

[0094] For the refrigeration system of this embodiment, its lubricating oil separation device 4 can store excess lubricating oil in the lower chamber 22 under the rich oil operating condition of the compressor 5, preventing the increase in power consumption caused by the increase in thermal resistance due to the excessive amount of lubricating oil circulating in the system; under the lean oil operating condition of the compressor 5, it can release the lubricating oil stored in the lower chamber 22 to supplement the lubricating oil to the compressor 5, improving the adaptability of the compressor lubricating oil supply to different working conditions. Moreover, separating and storing higher-quality lubricating oil under the rich oil operating condition can provide better lubricating effects under the condition of insufficient lubricating oil content. Therefore, such a refrigeration system can solve the problem of easy lack of oil in the operation of the compressor 5 under extreme working conditions, and can also solve the problem of increased thermal resistance and subsequent increased power consumption due to excessive lubricating oil under non-extreme working conditions.

[0095] In some embodiments, as Figure 2 and Figure 3 shown, the refrigeration system further includes:

[0096] A second connecting pipeline 200, connected between the third opening 13 and the intake port of the compressor 5; and

[0097] The second on-off valve 202 is provided on the second connecting pipeline 200 and is configured to be in an on state when the compressor 5 starts to enable the second connecting pipeline 200 to communicate, and to be in an off state when the compressor 5 stops to disconnect the second connecting pipeline 200.

[0098] Specifically, when the compressor 5 starts, the second on-off valve 202 opens, so that the lubricating oil can flow from the third opening 13 to the inlet of the compressor 5, ensuring that the compressor 5 always has sufficient lubricating oil for lubrication. When the compressor 5 stops, the second on-off valve 202 disconnects, which can prevent the lubricating oil in the compressor 5 from flowing back to the lubricating oil separation device 4, maintaining the oil quantity in the compressor 5 and preparing for the next start.

[0099] The second on-off valve 202 of this embodiment opens when the compressor 5 starts, which can ensure that the compressor 5 can obtain the separated lubricating oil from the lubricating oil separation device 4 at all times after each start; the second on-off valve 202 closes when the compressor 5 stops, which can prevent the loss of lubricating oil when the compressor 5 stops and ensure that there is enough lubricating oil when the compressor 5 starts; thus, it can reduce the wear of the compressor 5 and improve the stability and reliability of the refrigeration system.

[0100] In some embodiments, as Figure 2 and Figure 3 shown, the refrigeration system further includes:

[0101] A third connecting pipeline 300, connected between the fourth opening 14 and the air inlet of the compressor 5; and

[0102] A third on-off valve 303, provided on the third connecting pipeline 300 and configured to control the on-off of the third connecting pipeline 300.

[0103] Specifically, under the condition that the lubricating oil of the compressor 5 is insufficient, the third on-off valve 303 opens, and the third connecting pipeline 300 communicates, and the lubricating oil stored in the lower chamber 22 of the lubricating oil separation device 4 is replenished to the inlet of the compressor 5; under the condition that the compressor 5 operates with rich oil, the third on-off valve 303 closes, and only the third opening 13 of the lubricating oil separation device 4 communicates with the inlet of the compressor 5, and at the same time, the excess lubricating oil enters the lower chamber 22. Since the lubricating oil in the lower chamber 22 is stored under the condition of rich oil, the purity of the lubricating oil is relatively high and the quality is relatively high. Thus, while providing lubricating oil, high-quality lubricating oil is stored in the lower chamber 22.

[0104] The third on-off valve 303 of this embodiment controls the on-off of the third connecting pipeline 300, and can efficiently control the flow path of the lubricating oil according to the operating conditions of the compressor 5. When the compressor 5 is in the rich oil operating condition, only a small amount of lubricating oil is supplied to the compressor 5 through the second connecting pipeline 200 to ensure the effective replenishment and storage of the lubricating oil. When the compressor 5 is in the lean oil operating condition, lubricating oil is supplied to the compressor 5 through the second connecting pipeline 200 and the third connecting pipeline 300 at the same time. Thereby, the adaptability of the lubricating oil supply of the compressor 5 to the operating conditions is improved, and the reliability of the refrigeration system is improved.

[0105] In some embodiments, such as Figure 2 and Figure 3 shown, a first capillary tube section 201 is provided between the second on-off valve 202 and the inlet of the compressor 5, and a second capillary tube section 301 is provided between the third on-off valve 303 and the inlet of the compressor 5. The first capillary tube section 201 and the second capillary tube section 301 can be used to adjust the flow rate of the lubricating oil.

[0106] In some embodiments, when the compressor 5 is in the rich oil operating condition, the one-way flow mechanism 3 is configured to allow the lubricating oil to flow unidirectionally from the upper chamber 21 to the lower chamber 22, and the third on-off valve 303 is configured to be in the off state to disconnect the third connecting pipeline 300, so that the excess lubricating oil in the upper chamber 21 is stored in the lower chamber 22; when the compressor 5 is in the lean oil operating condition, the one-way flow mechanism 3 is configured to prevent the lubricating oil from flowing from the upper chamber 21 to the lower chamber 22, and the third on-off valve 303 is configured to be in the on state to connect the third connecting pipeline 300, so that the lubricating oil stored in the lower chamber 22 is replenished to the intake port of the compressor 5.

[0107] The refrigeration system of this embodiment can optimize the management of the lubricating oil in the lubricating oil separation device 4 through the cooperation of the one-way flow mechanism 3 and the third on-off valve 303, improve the adaptability of the lubricating oil supply of the compressor of the refrigeration system to the operating conditions, improve the reliability of the operation of the compressor and the entire refrigeration system, and ensure that the compressor and the refrigeration system are in the best operating state under different operating conditions.

[0108] In some embodiments, such as Figure 2 and Figure 3 shown, the refrigeration system further includes:

[0109] A gas-liquid separation device 7, provided upstream of the compressor 5; and

[0110] A mode switching valve group 8, configured to switch the refrigeration system between the heating mode and the cooling mode. In the heating mode, the second opening 12 communicates with the indoor heat exchanger 61, and the outlet of the outdoor heat exchanger 62 communicates with the gas-liquid separation device 7; in the cooling mode, the second opening 12 communicates with the outdoor heat exchanger 62, and the outlet of the indoor heat exchanger 61 communicates with the gas-liquid separation device 7.

[0111] Specifically, the gas-liquid separation device 7 can increase the percentage of gaseous refrigerant inhaled by the compressor 5, minimize the entry of liquid refrigerant into the compressor 5 to cause liquid hammer phenomenon, and improve the reliability of the refrigeration system. During the process of separating the liquid refrigerant, the lubricating oil in the pipeline and the heat exchanger will also be separated and stored at the bottom of the gas-liquid separation device 7. The bottom of the gas-liquid separation device 7 is provided with an oil return hole, so that the lubricating oil can return to the compressor 5.

[0112] Specifically, in the heating mode, the refrigeration system releases heat through the indoor heat exchanger 61, and the outdoor heat exchanger 62 absorbs heat; in the cooling mode, on the contrary, the refrigeration system absorbs heat through the indoor heat exchanger 61, and the outdoor heat exchanger 62 releases heat.

[0113] The gas-liquid separation device 7 of this embodiment can reduce the occurrence frequency of liquid hammer phenomenon of the compressor 5 and improve the reliability of the refrigeration system; the mode switching valve group 8 can enable the refrigeration system to smoothly switch between the heating mode and the cooling mode to meet the requirements of different working conditions.

[0114] In some embodiments, the refrigeration system further includes a first throttling component 63 and a second throttling component 64. The first throttling component 63 is an indoor throttling component, and the second throttling component 64 is an outdoor throttling component, which can achieve a better throttling effect. The throttling component can be an expansion valve or the like.

[0115] In some embodiments, the refrigeration system further includes a sensor and a controller. The sensor is configured to obtain the exhaust superheat of the compressor 5 to obtain the real-time state of the lubricating oil in the compressor 5, and the controller is configured to control the above-mentioned on-off valves to control the flow path of the lubricating oil, so as to realize the adaptive automatic adjustment of the refrigeration system to different working conditions.

[0116] In addition, the present disclosure also proposes a control method for a refrigeration system based on the above embodiments, including:

[0117] Judging whether the exhaust superheat of the compressor 5 is greater than a first preset threshold;

[0118] When the exhaust superheat of the compressor 5 is greater than the first preset threshold, the lubricating oil separation device 4 is put into the oil storage state, and the excess lubricating oil in the upper chamber 21 is stored in the lower chamber 22 and not replenished to the intake port of the compressor 5;

[0119] When the exhaust superheat of the compressor 5 is not greater than the first preset threshold, the lubricating oil separation device 4 is put into the oil replenishment state, and the lubricating oil stored in the lower chamber 22 is replenished to the intake port of the compressor 5.

[0120] The control method of the refrigeration system in this embodiment determines whether the superheat degree of the exhaust gas of the compressor 5 is greater than a first preset threshold value to enable the lubricating oil separation device to enter the oil storage state or the oil replenishment state. It can store excess lubricating oil under the rich oil operating condition of the compressor 5, and release the stored lubricating oil to supplement the lubricating oil to the compressor 5 under the condition that the lubricating oil content of the compressor 5 is insufficient, improving the adaptability of the compressor lubricating oil supply to different operating conditions; by separating and storing higher-quality lubricating oil under the rich oil operating condition, it can provide a better lubricating effect under the condition of insufficient lubricating oil content; it can enable the refrigeration system to solve the problem that the compressor 5 is prone to oil shortage during operation under extreme conditions, and can also solve the problem that the thermal resistance increases due to excessive lubricating oil during operation under non-extreme conditions, thereby increasing the power consumption.

[0121] In some embodiments,

[0122] Enabling the lubricating oil separation device 4 to enter the oil storage state includes: enabling the one-way flow mechanism 3 to allow the lubricating oil to flow unidirectionally from the upper chamber 21 to the lower chamber 22, and disconnecting the fourth opening 14 from the intake port of the compressor 5; and / or

[0123] Enabling the lubricating oil separation device 4 to enter the oil replenishment state includes: enabling the one-way flow mechanism 3 to prevent the lubricating oil from flowing from the upper chamber 21 to the lower chamber 22, and connecting the fourth opening 14 to the intake port of the compressor 5.

[0124] By adjusting the connection state between the fourth opening 14 and the intake port of the compressor 5 under different operating conditions in this embodiment, it can accurately control the flow path of the lubricating oil, ensuring that the compressor 5 can obtain sufficient lubricating oil supplement under different operating conditions; it can extend the service life of the compressor 5 and improve the overall performance of the refrigeration system.

[0125] In some embodiments, the one-way flow mechanism 3 includes a one-way valve 31 provided on the partition plate 2. The one-way valve 31 is configured to selectively allow the lubricating oil to flow unidirectionally from the upper chamber 21 to the lower chamber 22, and the inlet of the one-way valve 31 is higher than the third opening 13. The control method further includes:

[0126] In the oil storage state, when the lubricating oil level in the upper chamber 21 is not higher than the inlet height of the one-way valve 31, the refrigeration system is made to perform an oil return operation;

[0127] When the oil return operation lasts for a preset time, or the superheat degree of the exhaust gas of the compressor 5 is greater than the first preset threshold value, or the exhaust gas temperature of the compressor 5 is greater than the second preset threshold value, the refrigeration system exits the oil return operation and re-enters the oil storage state.

[0128] Specifically, the inlet height of the one-way valve 31 is the liquid level height H. Optionally, the refrigeration system can perform the oil return operation in the refrigeration mode or the heating mode. When the refrigeration system performs the oil return operation, the first on-off valve 101 is closed and the third on-off valve 303 is closed.

[0129] Specifically, when the refrigeration system performs the oil return operation, the refrigerant in the heat exchanger evaporates insufficiently, allowing the lubricating oil in the pipeline and the heat exchanger to dissolve in the liquid refrigerant and then be carried back to the gas-liquid separation device 7 through the high-speed operation of the refrigerant, and then return to the compressor 5 through the oil return hole, so as to ensure that the compressor 5 obtains sufficient lubricating oil. At the same time, it can also reduce the thermal resistance of the heat exchanger, improve the heat exchange efficiency of the refrigeration system, and reduce the power consumption of the refrigeration system.

[0130] Specifically, by setting the start node and end node of the oil return operation, the lubricating oil management of the refrigeration system can be optimized, so that the compressor 5 can always maintain sufficient lubricating oil under non-extreme working conditions, thereby reducing the wear of the compressor 5 and improving the stability and reliability of the refrigeration system.

[0131] In this embodiment, it is determined whether to perform the oil return operation according to the lubricating oil level height in the upper chamber 21. When the liquid level height in the upper chamber 21 is not higher than the inlet height of the one-way valve 31, the system performs the oil return operation to collect the lubricating oil in the pipeline and the heat exchanger and return it to the compressor 5 to ensure that the compressor 5 obtains sufficient lubricating oil; the oil return operation can also reduce the thermal resistance of the heat exchanger and improve the heat exchange efficiency of the refrigeration system.

[0132] In some embodiments, making the refrigeration system perform the oil return operation includes:

[0133] Making the refrigeration system operate in the refrigeration mode, making the superheat degree of the indoor heat exchanger 61 not greater than zero, making the one-way flow mechanism 3 prevent the lubricating oil from flowing unidirectionally from the upper chamber 21 to the lower chamber 22, and disconnecting the fourth opening 14 from the intake port of the compressor 5; or

[0134] Making the refrigeration system operate in the heating mode, making the superheat degree of the outdoor heat exchanger 62 not greater than zero, making the one-way flow mechanism 3 prevent the lubricating oil from flowing unidirectionally from the upper chamber 21 to the lower chamber 22, and disconnecting the fourth opening 14 from the intake port of the compressor 5.

[0135] In this embodiment, by making the superheat degree of the indoor heat exchanger 61 or the outdoor heat exchanger 62 not greater than zero, the refrigerant in the heat exchanger can evaporate insufficiently, and the lubricating oil can be dissolved in the liquid refrigerant and then be carried back to the gas-liquid separation device 7; by making the one-way flow mechanism 3 suspend storing lubricating oil, the lubricating oil supply amount of the compressor 5 can be ensured preferentially, and while the lubricating oil separation device 4 stores lubricating oil, the lubricating oil supply amount of the compressor 5 under non-extreme working conditions is also taken into account.

[0136] In some embodiments, the unidirectional flow mechanism 3 includes a check valve 31, a first connecting pipeline 100, and a first on-off valve 101. The check valve 31 is provided on the partition plate 2. The first connecting pipeline 100 is connected between the upper chamber 21 and the lower chamber 22. The first on-off valve 101 is provided on the first connecting pipeline 100. The refrigeration system includes a third connecting pipeline 300 and a third on-off valve 303. The third connecting pipeline 300 is connected between the fourth opening 14 and the intake port of the compressor 5. The third on-off valve 303 is provided on the third connecting pipeline 300. Among them,

[0137] Putting the lubricating oil separation device 4 into the oil storage state includes: putting the first on-off valve 101 in the on state and putting the third on-off valve 303 in the off state;

[0138] Putting the lubricating oil separation device 4 into the oil replenishment state includes: putting the first on-off valve 101 in the off state and putting the third on-off valve 303 in the on state.

[0139] The control method of this embodiment can optimize the lubricating oil management by dynamically adjusting the on-off states of the first connecting pipeline 100 and the third connecting pipeline 300. Whether the lubricating oil separation device 4 enters the oil storage state or the oil replenishment state, the refrigeration system can adjust the flow direction of the lubricating oil according to actual needs, thereby improving the working condition adaptability of the lubricating oil supply for the compressor.

[0140] In some embodiments, in the oil storage state, when the lubricating oil level in the upper chamber 21 is not higher than the inlet height of the check valve 31, the refrigeration system is made to perform an oil return operation. Making the refrigeration system perform an oil return operation includes:

[0141] Putting both the first on-off valve 101 and the third on-off valve 303 in the off state.

[0142] By closing the first on-off valve 101 and the third on-off valve 303 in this embodiment, the storage of lubricating oil can be paused, and the lubricating oil supply amount for the compressor 5 can be preferentially ensured, while taking into account the lubricating oil supply amount for the compressor 5 under non-extreme working conditions while the lubricating oil separation device 4 stores lubricating oil.

[0143] In some embodiments, the refrigeration system further includes a second connecting pipeline 200 and a second on-off valve 202. The second connecting pipeline 200 is connected between the third opening 13 and the intake port of the compressor 5. The second on-off valve 202 is provided on the second connecting pipeline 200. Before judging whether the exhaust superheat degree of the compressor 5 is greater than a first preset threshold, it further includes:

[0144] When the compressor 5 starts, putting the second on-off valve 202 in the on state;

[0145] When the compressor 5 stops, putting the second on-off valve 202 in the off state.

[0146] In this embodiment, the opening and closing of the second on-off valve 202 is determined according to whether the compressor 5 starts. The second on-off valve 202 is opened when the compressor 5 starts, which can ensure that the compressor 5 can obtain the separated lubricating oil from the lubricating oil separation device 4 every time it starts; the second on-off valve 202 is closed when the compressor 5 stops, which can prevent the loss of lubricating oil when the compressor 5 stops and ensure that there is enough lubricating oil when the compressor 5 starts.

[0147] The above has introduced in detail a lubricating oil separation device and a refrigeration system provided by the present disclosure. Specific embodiments are used herein to illustrate the principle and implementation manner of the present disclosure. The description of the above embodiments is only used to help understand the method and its core idea of the present disclosure. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present disclosure, several improvements and modifications can be made to the present disclosure, and these improvements and modifications also fall within the protection scope of the claims of the present disclosure.

Claims

1. A lubricating oil separation device, characterized in that: include: A housing (1) having a first opening (11), a second opening (12), a third opening (13) and a fourth opening (14); a partition plate (2) disposed in the shell (1) and dividing the space in the shell (1) into an upper chamber (21) and a lower chamber (22), wherein the upper chamber (21) is used to separate lubricating oil and a second refrigerant mixture from the first refrigerant mixture, and the lower chamber (22) is used to store the lubricating oil; and A one-way flow mechanism (3) configured to selectively allow lubricating oil to flow from the upper chamber (21) to the lower chamber (22) in one direction; The first opening (11) is used for allowing a first refrigerant mixture to flow into the upper chamber (21), the second opening (12) is used for allowing a second refrigerant mixture to flow out of the upper chamber (21), the third opening (13) is used for allowing lubricating oil in the upper chamber (21) to flow out, and the fourth opening (14) is used for optionally allowing lubricating oil in the lower chamber (22) to flow out.

2. The lubricating oil separation device according to claim 1, characterized in that: The one-way flow mechanism (3) comprises: A one-way valve (31) is provided on the partition plate (2), the one-way valve (31) being configured to allow lubricating oil to flow only in one direction from the upper chamber (21) to the lower chamber (22), and an inlet of the one-way valve (31) being higher than the third opening (13).

3. The lubricating oil separation device according to claim 2, characterized in that: The one-way flow mechanism (3) further comprises: a first connecting pipeline (100) disposed outside the housing (1) and connected between the upper chamber (21) and the lower chamber (22); and The first on-off valve (101) is provided on the first connecting pipeline (100) and is configured to control the on-off of the first connecting pipeline (100) and prevent the one-way valve (31) from opening in an off state, and balance the air pressure of the upper chamber (21) and the lower chamber (22) in an on state to allow the one-way valve (31) to open.

4. The lubricating oil separation device according to claim 1, characterized in that: The partition plate (2) protrudes towards the upper chamber (21).

5. The lubricating oil separation device according to claim 4, characterized in that: The one-way flow mechanism (3) comprises a one-way valve (31), wherein the one-way valve (31) is arranged at the highest position of the protruding portion of the partition plate (2), and the one-way valve (31) is configured to allow only one-way flow of lubricating oil from the upper chamber (21) to the lower chamber (22), and the inlet of the one-way valve (31) is higher than the third opening (13).

6. The lubricating oil separation device according to any one of claims 1 to 5, characterized in that: The invention also comprises a centrifugal separation mechanism arranged in the upper chamber (21), wherein the first opening (11) is located on the side wall of the shell (1) close to the top surface, the second opening (12) is located on the top surface of the shell (1), the third opening (13) is located on the side wall of the shell (1) and in the bottom area of ​​the upper chamber (21), and the fourth opening (14) is located on the bottom surface of the shell (1).

7. A refrigeration system, characterized in that: include: Compressor (5); An indoor heat exchanger (61) and an outdoor heat exchanger (62); and The lubricating oil separation device (4) according to any one of claims 1 to 6, wherein the first opening (11) is connected to the exhaust port of the compressor (5), the second opening (12) can be selectively connected to the indoor heat exchanger (61) or the outdoor heat exchanger (62), and the third opening (13) and the fourth opening (14) can be selectively connected to the air inlet of the compressor (5).

8. The refrigeration system according to claim 7, characterized in that: Also includes: A second connecting pipeline (200) connected between the third opening (13) and an air inlet of the compressor (5); and The second on-off valve (202) is provided on the second connecting pipeline (200) and is configured to be in an on state when the compressor (5) is started, and to be in an off state when the compressor (5) is stopped.

9. The refrigeration system according to claim 7, characterized in that: Also includes: a third connecting pipeline (300) connected between the fourth opening (14) and an air inlet of the compressor (5); and The third on-off valve (303) is provided on the third connecting pipeline (300) and is configured to control the on-off of the third connecting pipeline (300).

10. The refrigeration system according to claim 9, characterized in that: When the compressor (5) is in an oil-rich operating condition, the one-way flow mechanism (3) is configured to allow lubricating oil to flow from the upper chamber (21) to the lower chamber (22) in one direction, and the third on-off valve (303) is in an off state, so that excess lubricating oil in the upper chamber (21) is stored in the lower chamber (22); When the compressor (5) is in a lean operating condition, the one-way flow mechanism (3) is configured to prevent the lubricating oil from flowing from the upper chamber (21) to the lower chamber (22), and the third on-off valve (303) is in an on state, so that the lubricating oil stored in the lower chamber (22) is replenished to the air inlet of the compressor (5).

11. The refrigeration system according to any one of claims 7 to 10, characterized in that: Also includes: A gas-liquid separation device (7) is arranged upstream of the compressor (5); and The mode switching valve group (8) is configured to switch the refrigeration system between a heating mode and a cooling mode. In the heating mode, the second opening (12) is connected to the indoor heat exchanger (61), and the outlet of the outdoor heat exchanger (62) is connected to the gas-liquid separation device (7); in the cooling mode, the second opening (12) is connected to the outdoor heat exchanger (62), and the outlet of the indoor heat exchanger (61) is connected to the gas-liquid separation device (7).

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