Oil separator and refrigeration system containing it

Abstract

This application relates to the field of refrigeration technology, and provides an oil separator and a refrigeration system incorporating the same. The oil separator includes a tank, a packing assembly, and a heat exchange assembly. The tank has spaced-apart inlets and outlets. The packing assembly is located between the inlets and outlets, and includes a first packing layer and a second packing layer, spaced apart from the inlet to the outlet. The heat exchange assembly is located between the first and second packing layers. The oil separator provided by this application can improve oil separation efficiency, reduce residual oil in gaseous refrigerant, thereby alleviating the oil film problem on the condenser and evaporator in the refrigeration system and improving the heat exchange efficiency of the condenser and evaporator.

Description

Technical Field

[0001] This application relates to the field of refrigeration technology, and in particular to an oil separator and a refrigeration system incorporating the same. Background Technology

[0002] In refrigeration systems, lubricating oil is typically added to the compressor to lubricate the moving parts, reducing friction and wear. Furthermore, the lubricating oil can carry away heat generated by these parts, thus improving the compressor's lifespan and efficiency. However, the compressor often carries away some oil during discharge. If this oil enters the condenser or evaporator along with the gaseous refrigerant, it will form an oil film on their surfaces, affecting the heat exchange efficiency of the condenser and evaporator.

[0003] In related technologies, an oil separator is typically installed at the compressor's discharge port to separate the oil from the gaseous refrigerant. The oil is then returned to the compressor's crankcase using an oil return structure. However, current oil separators are still not very effective, leaving some oil residue. Over time, this leads to the formation of an oil film in the condenser and evaporator, affecting heat exchange efficiency. Utility Model Content

[0004] Therefore, it is necessary to provide an oil separator to improve the oil separation effect and reduce the residual oil in the gaseous refrigerant.

[0005] An oil separator includes a tank, a packing assembly, and a heat exchange assembly; the tank has an air inlet and an air outlet arranged at intervals; the packing assembly is disposed between the air inlet and the air outlet, and the packing assembly includes a first packing layer and a second packing layer, which are arranged at intervals from the air inlet to the air outlet; the heat exchange assembly is disposed between the first packing layer and the second packing layer.

[0006] Understandably, the oil mist mixture discharged from the compressor outlet flows into the tank through the inlet. After passing through the packing assembly and heat exchange assembly, the oil and gaseous refrigerant are fully separated, and the separated gaseous refrigerant flows out from the outlet. During this process, the first and second packing layers help retain the oil in the mixture as it passes through, allowing it to settle at the bottom of the tank under its own gravity. Simultaneously, because the heat exchange assembly is located between the first and second packing layers, it cools the oil mist mixture, promoting condensation into larger droplets, increasing their settling velocity, and making them more likely to be retained by the second packing layer. Thus, by utilizing the first and second packing layers and the heat exchange assembly between them, the oil separation effect is improved, significantly reducing residual oil in the gaseous refrigerant.

[0007] In some embodiments, the air inlet is located on the periphery of the tank, and the first packing layer and the second packing layer are arranged axially spaced along the air inlet.

[0008] In some embodiments, the air inlet is located below the air outlet.

[0009] In some embodiments, the packing assembly further includes a filter screen; the filter screen is provided on at least one side of the first packing layer and / or the second packing layer along a first direction, the first direction being the thickness direction of the packing assembly.

[0010] In some embodiments, the oil separator further includes a baffle plate disposed below the packing assembly and the heat exchange assembly, the baffle plate being inclined downward from the first packing layer to the second packing layer.

[0011] In some embodiments, the heat exchange assembly includes a plurality of coiled and connected heat exchange tubes, and at least a portion of the outer sidewalls of the heat exchange tubes are provided with a plurality of spaced heat exchange fins; and / or, the bottom of the tank is provided with an oil drain port, and the oil separator further includes an on / off valve provided at the oil drain port.

[0012] This application also provides a refrigeration system, including a refrigeration circuit and a heat exchange circuit; the refrigeration circuit includes a condenser, an evaporator, a first compressor and the aforementioned oil separator connected in series, the condenser includes a first tube group forming part of the refrigeration circuit and a second tube group forming part of the heat exchange circuit, the first tube group and the second tube group exchanging heat with each other;

[0013] The heat exchange circuit can exchange heat with the heat exchange component in the oil separator, or the heat exchange component in the oil separator forms part of the heat exchange circuit.

[0014] In some embodiments, the heat exchange circuit includes a heat exchanger and a second compressor; the heat exchanger includes a third tube group and a fourth tube group that exchange heat with each other; the air inlet of the second compressor is connected to the outlet of the second tube group, the exhaust port of the second compressor is connected to the inlet of the third tube group, and the outlet of the third tube group is connected to the inlet of the second tube group; wherein the outlet of the fourth tube group is connected to the inlet of the heat exchange assembly.

[0015] In some embodiments, the heat exchange circuit includes a heat exchanger, a second compressor, and a heat exchange expansion valve. The exhaust port of the second compressor is connected to the inlet of the heat exchanger, the air outlet of the second compressor is connected to the outlet of the second pipe assembly, and the heat exchange expansion valve is located between the outlet of the heat exchanger and the inlet of the second pipe assembly.

[0016] The heat exchange assembly is connected in series between the second pipe group and the second compressor, or the heat exchange assembly is connected in series between the heat exchange expansion valve and the second pipe group.

[0017] In some embodiments, the refrigeration circuit includes a first expansion valve and a second expansion valve, which are connected in parallel at the outlet of the first pipe assembly. The end of the first expansion valve facing away from the first pipe assembly is connected to the inlet of the evaporator, and the end of the second expansion valve facing away from the first pipe assembly is connected to the outlet of the evaporator. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A partial simplified diagram of an oil separator provided in an embodiment of this application;

[0020] Figure 2 A schematic diagram of a refrigeration system provided in an embodiment of this application;

[0021] Figure 3 A schematic diagram of a refrigeration system provided in another embodiment of this application;

[0022] Figure 4 This is a schematic diagram of a refrigeration system provided in one embodiment of the present application.

[0023] Reference numerals: 100, Refrigeration circuit; 110, Oil separator; 111, Tank; 112, Packing assembly; 113, Heat exchange assembly; 114, Baffle plate; 115, On / off valve; 120, Condenser; 130, Evaporator; 140, First compressor; 150, First expansion valve; 160, Second expansion valve; 200, Heat exchange circuit; 210, Heat exchanger; 220, Second compressor; 230, Heat exchange expansion valve; 240, Liquid receiver; 250, Filter; 300, Cooling pipeline; 1111, Air inlet; 1112, Air outlet; 1113, Oil drain; 1121, First packing layer; 1122, Second packing layer; 1123, Filter screen; 1131, Heat exchange tube; 1132, Medium inlet; 1133, Medium outlet; 1151, Control lever; 1152, Float. Detailed Implementation

[0024] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0025] It should be noted that when a component is referred to as being "fixed to" or "attached to" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0026] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0029] Please see Figure 1One embodiment of this application provides an oil separator 110, including a tank 111, a packing assembly 112, and a heat exchange assembly 113. The tank 111 has an inlet 1111 and an outlet 1112 arranged at intervals, and the packing assembly 112 is disposed between the inlet 1111 and the outlet 1112. The packing assembly 112 includes a first packing layer 1121 and a second packing layer 1122, which are arranged at intervals from the inlet 1111 to the outlet 1112. The heat exchange assembly 113 is disposed between the first packing layer 1121 and the second packing layer 1122. This oil separator 110 is used in a refrigeration system and is typically connected to the discharge port of a compressor to separate oil from the refrigerant discharged by the compressor.

[0030] Understandably, since the heat exchanger 113 is located between the first packing layer 1121 and the second packing layer 1122, and the packing assembly 112 is located between the inlet 1111 and the outlet 1112, it is equivalent to both the packing assembly 112 and the heat exchanger 113 being located between the inlet 1111 and the outlet 1112. Thus, the oil mist mixture discharged from the compressor exhaust port flows into the tank 111 through the inlet 1111, and within the tank 111, it needs to pass through the first packing layer 1121, the heat exchanger 113, and the second packing layer 1122 before flowing out through the outlet 1112. Both the first packing layer 1121 and the second packing layer 1122 are composed of porous materials, and the pores of these porous materials can intercept larger oil particles.

[0031] Therefore, when the oil mist mixture passes through the first packing layer 1121, the oil in the mixture is intercepted by the pores in the first packing layer 1121 and remains there. Then, under its own gravity, it settles at the bottom of the tank 111. Furthermore, due to the high surface tension of the oil, an oil film forms on the surface of the first packing layer 1121 as it passes through. As the oil mist mixture continues to flow in, the oil adheres and accumulates under the influence of surface tension, eventually settling at the bottom of the tank 111. Then, using the heat exchange component 113, the oil mist mixture that has not been completely separated by the first packing layer 1121 can be cooled, causing its temperature to drop and condense into larger oil droplets, thus increasing the settling velocity of the droplets. Therefore, when it passes through the second packing layer 1122, the oil can adhere and accumulate more thoroughly on the second packing layer 1122, improving the separation efficiency. The separation principle of the second packing layer 1122 is the same as that of the first packing layer 1121, and will not be described again here.

[0032] In other words, the oil separator 110 provided in this embodiment can perform multiple separations of the oil mist mixture by utilizing the cooperation of the first packing layer 1121, the second packing layer 1122 and the heat exchange component 113 between them, thereby improving the oil separation efficiency and significantly reducing the residual oil in the gaseous refrigerant.

[0033] The pore diameter of the first packing layer 1121 can be larger than that of the second packing layer 1122. The first packing layer 1121 separates larger oil droplets, while the second packing layer 1122 separates smaller oil droplets. Of course, the pore diameters of the first packing layer 1121 and the second packing layer 1122 can also be the same.

[0034] like Figure 1 As shown, in actual use, the bottom of the tank 111 is equipped with an oil drain port 1113. The oil drain port 1113 can be connected to the compressor's oil return port through a return oil pipe, thereby returning the separated oil to the compressor to meet its own lubrication and cooling requirements. A shut-off valve 115 can be installed at the oil drain port 1113. When the shut-off valve 115 is open, the oil flows back to the compressor through the return oil pipe; conversely, when the shut-off valve 115 is closed, the oil is temporarily stored in the tank 111.

[0035] like Figure 1 As shown, in some specific embodiments, the on / off valve 115 includes a float 1152 and a control rod 1151. One end of the control rod 1151 is connected to the float 1152, and the other end is connected to the tank body 111. The float 1152, under its own weight, presses against the drain port 1113 to seal it. When the oil in the tank body 111 accumulates to the point where the buoyancy of the float 1152 exceeds its weight, the float 1152 moves away from the drain port 1113, facilitating oil discharge. Alternatively, the on / off valve 115 can also utilize a solenoid valve for remote control.

[0036] like Figure 1 As shown, the heat exchange assembly 113 further includes a plurality of coiled and interconnected heat exchange tubes 1131, and at least a portion of the outer wall of the heat exchange tubes 1131 is provided with a plurality of spaced-apart heat exchange fins. The heat exchange medium flows through the heat exchange tubes 1131, and the arrangement of the heat exchange fins increases the contact area between the heat exchange tubes 1131 and the oil mist mixture, thereby improving cooling efficiency. Each heat exchange tube 1131 may have a plurality of spaced-apart heat exchange fins on its outer side. The heat exchange tubes 1131 are made of copper.

[0037] In some specific embodiments, the heat exchange assembly 113 has a medium inlet 1132 and a medium outlet 1133. The heat exchange medium flows in from the medium inlet 1132, flows along a plurality of heat exchange tubes 1131, and then flows out from the medium outlet 1133.

[0038] like Figure 1 As shown, in some embodiments, the air inlet 1111 is located on the periphery of the tank body 111, and the first packing layer 1121 and the second packing layer 1122 are arranged at axial intervals along the air inlet 1111. The arrangement is along the vertical direction (i.e., the height direction of the tank body 111) in the vertical direction. Figure 1In the Z-axis direction), the axial direction of the air inlet 1111 is along the horizontal direction (i.e., Figure 1 (in the X-axis direction). The first packing layer 1121 and the second packing layer 1122 are arranged at intervals along the axial direction of the inlet 1111 to match the flow direction of the oil mist mixture as much as possible. The first packing layer 1121 is located close to the inlet 1111, while the outlet 1112 is located on the side of the second packing layer 1122 away from the first packing layer 1121. This ensures that the refrigerant flowing out through the outlet 1112 must pass through the first packing layer 1121, the heat exchange component 113, and the second packing layer 1122 before it can flow out through the outlet 1112. Therefore, this arrangement further improves the separation effect.

[0039] In some specific embodiments, the air inlet 1111 and the air outlet 1112 are respectively located on opposite sides of the tank body 111. For example, if the cross-section of the tank body 111 is circular, the air inlet 1111 and the air outlet 1112 are respectively located on opposite sides of the tank body 111 in the radial direction. The upper side of the first packing layer 1121 and the upper side of the second packing layer 1122 are both fixed to the top of the tank body 111 to ensure that the packing assembly 112 and the heat exchange assembly 113 are always located on the flow path of the oil mist mixture.

[0040] like Figure 1 As shown, in some embodiments, the air inlet 1111 is located below the air outlet 1112. It is understood that the weight of gaseous refrigerant is less than that of oil, and it typically floats in a higher position. Therefore, placing the air outlet 1112 in a higher position facilitates the outflow of gaseous refrigerant. Simultaneously, because oil is heavier, placing the air inlet 1111 in a relatively lower position facilitates the adhesion of oil in the introduced oil mist mixture to the packing layer. Furthermore, this arrangement increases the flow path of the oil mist mixture from the air inlet 1111 to the air outlet 1112, and combined with the spaced arrangement of the first packing layer 1121 and the second packing layer 1122 to disperse the oil mist mixture, it creates a longer buffer distance between the two packing layers. This improves the separation effect and allows the separated refrigerant to flow out of the oil separator 110 more quickly.

[0041] Alternatively, when the air inlet 1111 is located on the upper periphery of the tank body 111, the axis of the air outlet 1112 can also coincide with the axis of the air inlet 1111, that is, the air inlet 1111 and the air outlet 1112 are set flush. This only requires that a packing assembly 112 and a heat exchange assembly 113 be provided between the air inlet 1111 and the air outlet 1112; this is merely an example.

[0042] like Figure 1As shown, in some embodiments, the packing assembly 112 further includes a filter screen 1123. The filter screen 1123 is provided on at least one side of the first packing layer 1121 and / or the second packing layer 1122 along a first direction, which is the thickness direction of the packing assembly 112. It is understood that the filter screen 1123 also has a porous structure, and can therefore also be used for oil mist mixture separation. The filter screen 1123 can intercept large oil particles, and oil mist mixtures impacting the filter screen 1123 can adhere to it. As the oil adheres, some small oil particles can agglomerate into larger oil particles, thereby promoting oil deposition at the bottom of the tank 111, achieving separation. Furthermore, the filter screen 1123 can also isolate other larger impurities in the oil mist mixture, such as iron filings, preventing them from flowing into the packing layer and causing blockage, thus improving the protection of the packing layer.

[0043] The first packing layer 1121 and the second packing layer 1122 are each provided with a filter screen 1123 on both sides along their thickness direction. The filter screens 1123 on the side of the first packing layer 1121 and the second packing layer 1122 facing the heat exchange component 113 can block impurities at the heat exchange component 113. Therefore, this arrangement is equivalent to providing protection on each side of the thickness direction of each packing layer.

[0044] Alternatively, the filter 1123 may be provided only on the side of the first packing layer 1121 facing the air inlet 1111, or on the side of the first packing layer 1121 facing the heat exchange component 113, or only on both sides of the first packing layer 1121 along its thickness direction. It may also be that the filter 1123 is provided only on the side of the second packing layer 1122 facing the heat exchange component 113, or only on the side of the second packing layer 1122 facing the air outlet 1112, or only on both sides of the second packing layer 1122 along its thickness direction. Furthermore, the filter 1123 may be provided on both the side of the first packing layer 1121 facing the air inlet 1111 and the side of the second packing layer 1122 facing the heat exchange component 113. These are merely illustrative examples.

[0045] like Figure 1As shown, in some embodiments, the oil separator 110 further includes a baffle plate 114, which is disposed below the packing assembly 112 and the heat exchange assembly 113. The baffle plate 114 is inclined downward from the first packing layer 1121 to the second packing layer 1122. That is, the baffle plate 114 is used to receive the oil deposited by the packing assembly 112 and the heat exchange assembly 113, and then the inclined arrangement of the baffle plate 114 is used to guide the oil to the bottom of the tank 111. At the same time, the baffle plate 114 can also provide support for the packing assembly 112 and the heat exchange assembly 113. The baffle plate 114 may be provided with oil leakage holes to facilitate the deposition of oil at the bottom of the tank 111.

[0046] Please see Figures 1 to 4 An embodiment of this application also provides a refrigeration system, including a refrigeration circuit 100 and a heat exchange circuit 200. The refrigeration circuit 100 includes a condenser 120, an evaporator 130, a first compressor 140, and the aforementioned oil separator 110 connected in series. The condenser 120 includes a first tube group forming part of the refrigeration circuit 100 and a second tube group forming part of the heat exchange circuit 200, and the first tube group and the second tube group exchange heat with each other. The heat exchange circuit 200 is capable of exchanging heat with the heat exchange component 113 in the oil separator 110, or the heat exchange component 113 in the oil separator 110 forms part of the heat exchange circuit 200.

[0047] In other words, the low-pressure gaseous refrigerant is converted into a high-pressure gaseous refrigerant by the first compressor 140, and flows out from the exhaust port of the first compressor 140 to the inlet 1111 of the oil separator 110. After oil-liquid separation by the aforementioned packing assembly 112 and heat exchange assembly 113, it flows out from the outlet 1112 of the oil separator 110 to the first tube group of the condenser 120, where it condenses and releases heat to become liquid refrigerant. Then, it flows to the evaporator 130 to evaporate and absorb heat to become gaseous refrigerant. In this way, the refrigerant cycle is satisfied. During this process, the heat exchange circuit 200 is used to ensure the cooling requirements of the heat exchange assembly 113, thereby facilitating the cooling of the oil mist mixture and improving the separation effect. In this way, the oil deposited in the condenser 120 and evaporator 130 can be reduced, thus ensuring the heat exchange effect of the condenser 120 and heat exchanger 210.

[0048] Please see Figures 2 to 4In actual use, the refrigeration circuit 100 includes a first expansion valve 150 and a second expansion valve 160. The first expansion valve 150 and the second expansion valve 160 are connected in parallel at the outlet of the first pipe assembly. The end of the first expansion valve 150 facing away from the first pipe assembly is connected to the inlet of the evaporator 130, and the end of the second expansion valve 160 facing away from the first pipe assembly is connected to the outlet of the evaporator 130. Thus, the liquid refrigerant after condensation and heat release by the condenser 120 can be divided into two paths. One path flows to the evaporator 130 for evaporation and heat absorption after being throttled by the first expansion valve 150, while the other path flows directly to the first compressor 140 after being throttled by the second expansion valve 160 and mixed with the refrigerant after evaporation and heat absorption.

[0049] like Figure 1 and Figure 2 As shown, in some embodiments, the heat exchange circuit 200 can exchange heat with the heat exchange assembly 113 in the oil separator 110. Specifically, the heat exchange circuit 200 includes a heat exchanger 210 and a second compressor 220. The heat exchanger 210 includes a third tube group and a fourth tube group that exchange heat with each other. The air inlet of the second compressor 220 is connected to the outlet of the second tube group, the exhaust port of the second compressor 220 is connected to the inlet of the third tube group, and the outlet of the third tube group is connected to the inlet of the second tube group. The outlet of the fourth tube group is connected to the medium inlet 1132 of the heat exchange assembly 113. Specifically, the fourth tube group is connected to the medium inlet 1132 of the heat exchange assembly 113 through a cooling pipe 300 for the flow of the heat exchange medium.

[0050] Because the second and first tube groups exchange heat, the refrigerant in the refrigeration circuit 100 condenses and releases heat in the first tube group, transforming into a low-temperature liquid refrigerant. Therefore, the heat exchange medium in the heat exchange circuit 200 absorbs heat from the first tube group at the second tube group and, under the action of the second compressor 220, flows to the third tube group of the heat exchanger 210, absorbing heat from the heat exchange medium in the fourth tube group. Since the fourth tube group is connected to the inlet of the heat exchange assembly 113, the heat exchange medium flowing through the fourth tube group is cooled and then flows to the heat exchange assembly 113 to cool the oil mist mixture in the oil separator 110. The heat exchange medium flowing through the fourth tube group can be cooling water, and the fourth tube group can be connected to an external water pipe to deliver cooling water. After being cooled by the heat exchange assembly 113, the cooling water can flow out from the outlet of the heat exchange assembly 113 to an external pipeline for further processing.

[0051] like Figure 1 and Figure 3As shown, in some embodiments, the heat exchange assembly 113 in the oil separator 110 forms part of the heat exchange circuit 200. Specifically, the heat exchange circuit 200 includes a heat exchanger 210, a second compressor 220, and a heat exchange expansion valve 230. The exhaust port of the second compressor 220 is connected to the inlet of the heat exchanger 210, and the air inlet of the second compressor 220 is connected to the outlet of the second pipe assembly. The heat exchange expansion valve 230 is located between the outlet of the heat exchanger 210 and the inlet of the second pipe assembly. The heat exchange assembly 113 is connected in series between the second pipe assembly and the second compressor 220, that is, the medium inlet 1132 of the heat exchange assembly 113 is connected to the second pipe assembly, and the medium outlet 1133 is connected to the second compressor 220.

[0052] In this design, condenser 120 is an evaporative condenser, and heat exchanger 210 is a water-cooled condenser. Therefore, the heat exchange medium in the heat exchange circuit 200 can be cooled by the cooling capacity of the evaporative condenser at the second tube group. The cooled heat exchange medium then flows to heat exchange assembly 113 for cooling the oil mist mixture. The cooled heat exchange medium then flows from the outlet of heat exchange assembly 113 to the second compressor 220, and then to the water-cooled condenser for circulation.

[0053] like Figure 1 and Figure 4 As shown, alternatively, the heat exchange assembly 113 is connected in series between the heat exchange expansion valve 230 and the second tube bundle. That is, the heat exchange medium, after being cooled by the water-cooled condenser, flows to the heat exchange expansion valve 230, and after being throttled by the heat exchange expansion valve 230, flows to the heat exchange assembly 113 for cooling of the oil mist mixture. Then, it flows out from the outlet of the heat exchange assembly 113 and flows to the second tube bundle of the evaporative condenser, and thus flows to the second compressor 220 for circulation.

[0054] like Figures 2 to 4 As shown, in actual use, the heat exchange circuit 200 also includes a liquid receiver 240 and a filter 250, which are connected in series between the heat exchanger 210 and the heat exchange expansion valve 230. The filter 250 can filter impurities such as iron cores in the heat exchange medium, and the liquid receiver 240 can store liquid heat exchange medium, stabilize the flow rate, and thus extend the service life of the heat exchange circuit 200.

[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0056] The embodiments described above are merely illustrative of several implementation methods of this application, and 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 those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. An oil separator, characterized in that, include: The tank body (111) is provided with an air inlet (1111) and an air outlet (1112) arranged at intervals. A packing assembly (112) is disposed between the air inlet (1111) and the air outlet (1112). The packing assembly (112) includes a first packing layer (1121) and a second packing layer (1122), which are arranged at intervals from the air inlet (1111) to the air outlet (1112). The heat exchange assembly (113) is disposed between the first packing layer (1121) and the second packing layer (1122).

2. The oil separator according to claim 1, characterized in that, The air inlet (1111) is located on the periphery of the tank (111), and the first packing layer (1121) and the second packing layer (1122) are arranged at intervals along the axial direction of the air inlet (1111).

3. The oil separator according to claim 2, characterized in that, The air inlet (1111) is located below the air outlet (1112).

4. The oil separator according to claim 1, characterized in that, The packing assembly (112) also includes a filter screen (1123). The filter screen (1123) is provided on at least one side of the first packing layer (1121) and / or the second packing layer (1122) along a first direction, the first direction being the thickness direction of the packing assembly (112).

5. The oil separator according to claim 1, characterized in that, The oil separator (110) also includes a baffle plate (114), which is located below the packing assembly (112) and the heat exchange assembly (113). The baffle plate (114) is inclined downward from the first packing layer (1121) to the second packing layer (1122).

6. The oil separator according to any one of claims 1 to 5, characterized in that, The heat exchange assembly (113) includes a plurality of coiled and connected heat exchange tubes (1131), and at least a portion of the heat exchange tubes (1131) have a plurality of spaced heat exchange fins on their outer side walls; and / or, the bottom of the tank (111) is provided with an oil drain port (1113), and the oil separator (110) also includes an on / off valve (115) provided at the oil drain port (1113).

7. A refrigeration system, characterized in that, It includes a refrigeration circuit (100) and a heat exchange circuit (200). The refrigeration circuit (100) includes a condenser (120), an evaporator (130), a first compressor (140), and an oil separator according to any one of claims 1 to 6 connected in series. The condenser (120) includes a first tube group forming part of the refrigeration circuit (100) and a second tube group forming part of the heat exchange circuit (200), wherein the first tube group and the second tube group exchange heat with each other. The heat exchange circuit (200) is capable of exchanging heat with the heat exchange component (113) in the oil separator (110), or the heat exchange component (113) in the oil separator (110) forms part of the heat exchange circuit (200).

8. The refrigeration system according to claim 7, characterized in that, The heat exchange circuit (200) includes: The heat exchanger (210) includes a third tube group and a fourth tube group that exchange heat with each other; The second compressor (220) has its air inlet connected to the outlet of the second pipe group, its exhaust port connected to the inlet of the third pipe group, and the outlet of the third pipe group connected to the inlet of the second pipe group. The outlet of the fourth tube group is connected to the inlet of the heat exchange component (113).

9. The refrigeration system according to claim 7, characterized in that, The heat exchange circuit (200) includes a heat exchanger (210), a second compressor (220), and a heat exchange expansion valve (230). The exhaust port of the second compressor (220) is connected to the inlet of the heat exchanger (210), and the air supply port of the second compressor (220) is connected to the outlet of the second pipe group. The heat exchange expansion valve (230) is located between the outlet of the heat exchanger (210) and the inlet of the second pipe group. The heat exchange assembly (113) is connected in series between the second pipe group and the second compressor (220), or the heat exchange assembly (113) is connected in series between the heat exchange expansion valve (230) and the second pipe group.

10. The refrigeration system according to claim 7, characterized in that, The refrigeration circuit (100) includes a first expansion valve (150) and a second expansion valve (160). The first expansion valve (150) and the second expansion valve (160) are connected in parallel at the outlet of the first pipe assembly. The end of the first expansion valve (150) away from the first pipe assembly is connected to the inlet of the evaporator (130), and the end of the second expansion valve (160) away from the first pipe assembly is connected to the outlet of the evaporator (130).

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