A separation structure

Abstract

The application provides a separation structure, a first separation tank is internally provided with a first separation cavity, a first gas inlet and a first gas outlet are arranged on the shell of the first separation tank and are communicated with the first separation cavity, so that the fluid entering the first separation cavity from the first gas inlet is sequentially discharged from the first gas outlet after passing through a first flow guide assembly and a filter part; the first flow guide assembly is used for guiding the fluid, and the filter part is used for filtering the oil in the fluid; a second separation tank is arranged outside the first separation cavity, the second separation tank is connected with the first separation tank; the second separation tank is provided with a second gas inlet and a second gas outlet which are communicated with a second separation cavity, and the second separation tank is provided with a second flow guide assembly which is used for guiding the fluid, so that the fluid entering the second separation cavity from the second gas inlet sequentially passes through the second flow guide assembly and the second gas outlet and then enters the first gas inlet, and the technical problem that the separation of the oil in the tank is not sufficient is solved.

Description

Technical Field

[0001] This invention relates to the field of oil separation technology, and more specifically to a separation structure. Background Technology

[0002] As one of the four key components of a screw compressor refrigeration unit, the oil separator is responsible for separating and filtering the high-temperature, high-pressure gaseous refrigerant and refrigeration oil mixture discharged from the compressor during the refrigeration cycle.

[0003] During actual operation, the high-temperature, high-pressure gaseous refrigerant discharged from the screw compressor carries some compressor oil particles into the oil separator. If this portion of refrigerant oil is carried by the airflow into the condenser or accumulates in the evaporator with the circulating medium, it not only reduces the heat exchange capacity of both units but also causes the compressor to be damaged due to lack of refrigerant oil lubrication, ultimately leading to the system's inability to operate safely and continuously.

[0004] Currently, to address the issue of refrigerant oil separation and ensure continuous and safe system operation, units employ oil separators to separate the oil and gas in the fluid discharged from the compressor. The separated high-purity gaseous refrigerant enters the condenser, while the liquid refrigerant oil returns to the compressor using the pressure difference effect. Oil separators play an indispensable role in the stability of commercial screw compressor units. Commonly used types of oil separators include vertical external oil separators and horizontal external oil separators.

[0005] However, in practical applications, oil separators are typically connected to the compressor outlet, handling high-temperature, high-pressure gas-liquid mixtures. Furthermore, the liquid oil droplets have a wide particle size distribution, with most ranging from 1 to 50 μm and a small portion as small as 0.01 μm. Simultaneously, a very small portion of lubricating oil exists in the gaseous phase, making separation difficult. Existing oil separators often fail to achieve ideal separation results, unable to completely separate the oil from the gas.

[0006] Therefore, existing technologies need further development. Summary of the Invention

[0007] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide a separation structure to solve the technical problem that separators in related technologies do not sufficiently separate oil from fluids. To achieve the above technical objective, this invention adopts the following technical solution: A separation structure is provided, comprising: a first separation tank, which has a first separation chamber; the outer shell of the first separation tank is provided with a first air inlet and a first air outlet communicating with the first separation chamber, so that fluid entering the first separation chamber from the first air inlet passes sequentially through a first flow guiding component and a filter section before being discharged from the first air outlet; the first separation chamber is provided with a first flow guiding component and a filter section; the first flow guiding component guides the fluid, and the filter section filters the oil in the fluid; a second separation tank, located outside the first separation chamber and connected to the first separation tank; the second separation tank has a second separation chamber, which has a second air inlet and a second air outlet communicating with the second separation chamber; the second separation tank has a second flow guiding component for guiding the fluid, so that fluid entering the second separation chamber from the second air inlet passes sequentially through the second flow guiding component and the second air outlet before entering the first air inlet.

[0008] Furthermore, a flow-blocking component is provided inside the first separation tank, and the flow-blocking component has a flow channel that is connected to the first air outlet. The filter is located inside the flow channel. A first flow-guiding channel is provided between the flow-blocking component and the side wall of the first separation tank. A first flow-guiding assembly is located inside the first flow-guiding channel. The first air inlet is connected to the first flow-guiding channel so that the fluid flows into the flow channel after passing through the first flow-guiding channel.

[0009] Furthermore, the first flow guiding assembly includes a first flow guiding plate located within the first flow guiding channel. The first flow guiding plate is connected to the end of the flow blocking component away from the flow channel. The first flow guiding plate is arranged around the flow blocking component, and a first flow guiding port for allowing fluid to flow is provided on the first flow guiding plate.

[0010] Furthermore, there are multiple first guide plates, which are arranged at intervals; the first guide ports between two adjacent first guide plates are arranged opposite each other; and / or, the first guide assembly also includes a second guide plate disposed on the inner wall of the first separation chamber, the second guide plate is disposed around the flow blocking component, the second guide plate is provided with a second guide port for allowing fluid to pass through, and the second guide plate is located between two adjacent first guide plates.

[0011] Furthermore, the first separator includes a tank body and a cover on the tank body, a first vent is provided on the cover, and a flow-blocking component is connected to the cover; a liquid storage tank is provided at the end of the first separator away from the cover, and an oil return pipe connected to the liquid storage tank is provided on the first separator; an oil guide pipe connected to the first separator is provided on the second separator, one end of the oil guide pipe is connected to the bottom of the second separator, and the other end of the oil guide pipe is connected to the liquid storage tank.

[0012] Furthermore, the second flow guiding assembly includes a first baffle, a second baffle, and a third baffle, all of which are disposed between two opposite inner walls of the second separator tank; the first baffle, the second baffle, and the third baffle form a flow cavity, and the second air inlet is on the inner wall of the second separator tank, communicating with the flow cavity.

[0013] Furthermore, one end of the first baffle is connected to the second baffle, and the other end of the first baffle is connected to the third baffle. The second baffle and the third baffle are arranged at intervals. The flow chamber is located between the second baffle and the third baffle. The second baffle and / or the third baffle has a second flow channel between itself and the inner wall of the second separation tank so that the fluid in the flow chamber enters the second air outlet through the second flow channel.

[0014] Furthermore, a first liquid-blocking plate is provided on the side of the second baffle and / or the third baffle away from the flow cavity. One end of the first liquid-blocking plate is connected to a first connecting portion that is connected to the second baffle or the third baffle, and the other end of the first liquid-blocking plate extends downward toward the first connecting portion.

[0015] Furthermore, a second baffle plate is provided on the inner wall of the second separation tank. One end of the second baffle plate has a second connecting part that connects to the inner wall of the second separation tank, and the other end of the second baffle plate extends downward toward the second connecting part. There are multiple first baffle plates and multiple second baffle plates. In the vertical direction, the multiple first baffle plates and the multiple second baffle plates are arranged alternately.

[0016] Furthermore, the separation structure also includes an air inlet pipe 7, which is inserted into the second air inlet. The air inlet pipe 7 penetrates the flow cavity and abuts against the inner wall of the second separation tank. An air inlet channel is provided inside the air inlet pipe 7, and a second air outlet is provided on the side wall of the air inlet pipe 7. The first air inlet and the air inlet channel are connected through the second air outlet.

[0017] Beneficial effects:

[0018] When the fluid passes through the separation structure, the oil and liquid are fully separated. The separation space of the separation structure is utilized efficiently, improving the separation efficiency and solving the technical problem that the separator in related technologies does not separate the oil and liquid in the fluid sufficiently.

[0019] An external separation device is designed in the outer area of ​​the shell. After passing through the external separation device, the oil enters the upper area of ​​the oil separator shell. After passing through the guide channel, it enters the filter screen for separation and then the dry gas is discharged. The liquid oil droplets are separated in multiple directions and finally converge in the return oil area to participate in the system lubrication and cooling. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the internal structure of the separation structure used in the embodiments of the present invention;

[0021] Figure 2 This is a front view of the separated structure used in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the separation structure used in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the flow-blocking component with a separate structure used in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the second separation tank provided in the embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the internal structure of the second separation tank provided in the embodiment of the present invention;

[0026] Figure 7 This is a front view of the second separation tank of the separation structure provided in the embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the internal structure of the second separation tank of the separation structure provided in the embodiment of the present invention.

[0028] The above figures include the following reference numerals:

[0029] 1. First separator tank; 11. First separator chamber; 12. First air inlet; 13. First air outlet; 14. Baffle component; 15. First flow guide channel; 141. Flow channel; 3. First flow guide assembly; 31. First guide plate; 32. Second guide plate; 311. First flow guide port; 4. Filter section; 5. Second separator tank; 51. Second separator chamber; 52. Second air inlet; 53. Second air outlet; 54. Oil guide pipe; 6. Second flow guide assembly; 61. First baffle; 62. Second baffle; 63. Third baffle; 64. Flow chamber; 65. Second flow guide channel; 66. First liquid baffle; 67. Second liquid baffle; 7. Air inlet pipe; 72. Air inlet channel;

[0030] 101. Tank body; 102. Cover; 103. Liquid storage tank; 104. Oil return pipe. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0032] According to an embodiment of the present invention, a separation structure is provided; please refer to [link / reference]. Figures 1 to 8 The system includes: a first separation tank 1, which has a first separation chamber 11 inside. The outer shell of the first separation tank 1 is provided with a first air inlet 12 and a first air outlet 13 communicating with the first separation chamber 11, so that the fluid entering the first separation chamber 11 from the first air inlet 12 passes through the first flow guide assembly 3 and the filter part 4 in sequence and is discharged from the first air outlet 13; the first separation chamber 11 is provided with the first flow guide assembly 3 and the filter part 4; the first flow guide assembly 3 is used to guide the fluid, and the filter part 4 is used to filter the oil in the fluid; a second separation tank 5, located outside the first separation chamber 11, and connected to the first separation tank 1; the second separation tank 5 has a second separation chamber 51 inside, and has a second air inlet 52 and a second air outlet 53 communicating with the second separation chamber 51; the second separation tank 5 has a second flow guide assembly 6 for guiding the fluid, so that the fluid entering the second separation chamber 51 from the second air inlet 52 passes through the second flow guide assembly 6 and the second air outlet 53 in sequence and enters the first air inlet 12.

[0033] The separation structure in this embodiment features a three-stage separation technology. The first stage is the first separation tank 1 externally mounted to the outside of the first separation tank; the second stage is the separation structure consisting of a flow-blocking component 14 and a first flow-guiding component 3; and the third stage is the filter section 4 with a filter screen layout inside the first separation tank 1. This configuration ensures thorough oil-liquid separation as the fluid passes through the separation structure, maximizing the utilization of the separation space and improving separation efficiency. It also solves the technical problem in related technologies where separators do not adequately separate the oil from the fluid.

[0034] Specifically, in this embodiment, the separation structure has an external separation device designed in the outer area of ​​the shell. After passing through the external separation device, the oil enters the upper area of ​​the oil separator shell, passes through the guide channel, enters the filter screen for separation, and then discharges dry gas. After being separated in multiple directions, the liquid oil droplets finally converge in the return oil area to participate in the system's lubrication and cooling function.

[0035] See Figure 1 , Figure 4 In the separation structure of this embodiment, a flow-blocking component 14 is provided inside the first separation tank 1. The flow-blocking component 14 has a flow channel 141, which is connected to the first air outlet 13. The filter part 4 is disposed inside the flow channel 141. A first flow-guiding channel 15 is provided between the flow-blocking component 14 and the side wall of the first separation tank 1. A first flow-guiding assembly 3 is disposed inside the first flow-guiding channel 15. The first air inlet 12 is connected to the first flow-guiding channel 15, so that the fluid flows into the flow channel 141 after passing through the first flow-guiding channel 15. In this way, when the fluid enters the first separation tank 1, it first passes through the first flow-guiding channel 15, increasing the flow path of the fluid and giving the fluid more time to separate the oil.

[0036] In the separation structure of this embodiment, the first flow guiding assembly 3 includes a first flow guiding plate 31 located within the first flow guiding channel 15. The first flow guiding plate 31 is connected to the end of the flow blocking component 14 away from the flow channel 141. The first flow guiding plate 31 is arranged around the flow blocking component 14, and a first flow guiding port 311 for fluid flow is provided on the first flow guiding plate 31. In this way, the fluid flows along the first flow guiding plate 31, making the first flow guiding plate 31 form a backflow channel, increasing the flow path of the fluid. Furthermore, the fluid collides with the first flow guiding plate 31, thereby improving the separation of oil in the fluid.

[0037] In the separation structure of this embodiment, there are multiple first guide plates 31, which are arranged at intervals. The first guide ports 311 between two adjacent first guide plates 31 are arranged opposite each other. The first guide assembly 3 also includes a second guide plate 32 disposed on the inner wall of the first separation chamber 11. The second guide plate 32 surrounds the flow-blocking component 14 and has a second guide port for allowing fluid to pass through. The second guide plate 32 is located between two adjacent first guide plates 31. This makes the flow channel formed by the guide plates more complex, further improving the airflow effect of the oil.

[0038] like Figure 4 The structure of the flow-blocking component 14 and the flow-guide plate assembly.

[0039] The flow-blocking component 14 is located in the upper region of the oil separator, surrounded by staggered guide vanes, forming an S-shaped flow separation effect. The flow through the long channel causes a change in fluid composition; the oil droplets, with higher density, are located at the bottom of the channel, while the gas, with lower density, operates in the middle of the channel where resistance is least. At the airflow outlet, the oil droplets are diverted downwards by gravity, while the gas must flow upwards towards the filter to overcome the final separation resistance and enter the refrigeration system to participate in the circulation.

[0040] In the separation structure of this embodiment, the first separation tank 1 includes a tank body 101 and a cover 102 covering the tank body 101. A first air outlet 13 is provided on the cover 102, and a flow-blocking component 14 is connected to the cover 102. A liquid storage tank 103 is provided at the end of the first separation tank 1 away from the cover 102, and an oil return pipe 104 communicating with the liquid storage tank 103 is provided on the first separation tank 1. An oil guide pipe 54 is provided on the second separation tank 5 and connected to the first separation tank 1. One end of the oil guide pipe 54 is connected to the bottom of the second separation tank 5, and the other end of the oil guide pipe 54 is connected to the liquid storage tank 103. With the above configuration, the oil separated in the first separation tank 1 can eventually flow into the liquid storage tank 103, thereby facilitating the collection of oil and simplifying the structure.

[0041] See Figures 5 to 8In the separation structure of this embodiment, the second flow guiding component 6 includes a first baffle 61, a second baffle 62, and a third baffle 63. The first baffle 61, the second baffle 62, and the third baffle 63 are all disposed between two opposite inner walls of the second separation tank 5. The first baffle 61, the second baffle 62, and the third baffle 63 form a flow cavity 64. A second air inlet 52 is located on the inner wall of the second separation tank 5 and communicates with the flow cavity 64. With this configuration, the second flow guiding component 6 forms a U-shaped groove, allowing fluid to flow both inside and outside the groove, increasing the fluid flow path and enabling the oil in the fluid to be separated first within the second separation tank 5.

[0042] In the separation structure of this embodiment, see Figures 5 to 8 One end of the first baffle 61 is connected to the second baffle 62, and the other end of the first baffle 61 is connected to the third baffle 63. The second baffle 62 and the third baffle 63 are spaced apart. The flow cavity 64 is located between the second baffle 62 and the third baffle 63. A second guide channel 65 is provided between the second baffle 62 and / or the third baffle 63 and the inner wall of the second separator tank 5, so that the fluid in the flow cavity 64 enters the second air outlet 53 through the second guide channel 65. With the above structure, a structure for guiding fluid flow can be formed using three plates, making the structure of the second separator tank 5 simpler.

[0043] In the separation structure of this embodiment, a first liquid-blocking plate 66 is provided on the side of the second baffle 62 and / or the third baffle 63 away from the flow cavity 64. One end of the first liquid-blocking plate 66 is connected to a first connecting portion that is connected to the second baffle 62 or the third baffle 63, and the other end of the first liquid-blocking plate 66 extends downward toward the first connecting portion.

[0044] In the separation structure of this embodiment, a second liquid-blocking plate 67 is provided on the inner wall of the second separation tank 5. One end of the second liquid-blocking plate 67 has a second connecting part that connects to the inner wall of the second separation tank 5, and the other end of the second liquid-blocking plate 67 extends downward toward the second connecting part. There are multiple first liquid-blocking plates 66 and multiple second liquid-blocking plates 67. In the vertical direction, the multiple first liquid-blocking plates 66 and the multiple second liquid-blocking plates 67 are arranged alternately.

[0045] Specifically, see Figure 6In this embodiment, during operation of the second separator 5, the airflow first enters the inlet pipe 7, then impacts the second guide assembly 6 upwards before flowing downwards. The gas flows upwards, while oil droplets flow downwards and converge in the oil guide pipe, returning to the bottom oil zone of the oil separator. The airflow continues through the first and second baffle plates 66 and 67, which are arranged in a cross-shaped, ear-like pattern on both sides, and enters the top airflow channel, where it enters the dual-channel exhaust pipe to participate in the separation process inside the oil separator housing. Within this device, the oil-gas mixture undergoes impact separation, gravity separation, and baffle plate separation, achieving over 80%-90% oil separation.

[0046] In the separation structure of this embodiment, the separation structure also includes an air inlet pipe 7, which is inserted into the second air inlet 52, penetrates the flow cavity 64, and abuts against the inner wall of the second separation tank 5. An air inlet channel 72 is provided inside the air inlet pipe 7, and a second air outlet 53 is provided on the side wall of the air inlet pipe 7. The first air inlet 12 and the air inlet channel 72 are connected through the second air outlet 53. This configuration makes the separation structure more robust, ensuring the air inlet pipe 7 is secure and stable during use.

[0047] The separator structure of this embodiment has a three-stage separation technology. The first stage is the first separation tank 1 externally attached to the outside of the first separation tank. The second stage is the separation structure arranged with the flow-blocking component 14 and the first flow-guiding component 3. The third stage is the filter section 4 with a filter screen layout inside the first separation tank 1.

[0048] In a conventional vertical oil separator structure, the oil-laden gaseous refrigerant enters the oil separator space through the top inlet and disperses. Some large oil droplets initially flow downwards under gravity to the bottom and enter the return oil zone. Most of the droplets are carried away by the airflow and collide with the baffle, separating some of the oil droplets. The remaining small oil droplets continue into the oil separator space with the airflow, bypassing the baffle. During the flow, under the influence of gravity and inertia, the lighter gaseous refrigerant flows towards the oil separator filter, while the small oil droplets gradually decrease in velocity and eventually settle to the bottom oil level zone. This type of structure offers advantages such as simplicity and low vibration during the operation of small-capacity chillers. However, it suffers from low space utilization, a narrow applicability range, and unstable oil separation capacity for chillers operating under variable conditions, being significantly affected by airflow fluctuations.

[0049] Therefore, see Figures 1 to 8This embodiment improves upon the vertical oil separator structure by incorporating a second separation tank 5, a step-by-step oil separator structure. This structure employs a segmented separation layout to divide the flow field, creating a distributed separation pattern. It effectively separates and sieves the gas-liquid mixture within the flow field, with the second separation tank 5 in the first section handling 80%-90% of the separation load. The separation structure, consisting of the second-section baffle 14 and the liquid guide plate, provides intermediate flow guidance and separation for the gas-liquid mixture. After the airflow is divided by the second-section separation structure, liquid oil droplets are drawn downwards by gravity into the bottom oil zone. The separated airflow bypasses the baffle 14 and passes through a filter screen for final filtration before entering the refrigeration cycle system. This three-stage separation technology achieves progressive separation of oil droplets of different sizes.

[0050] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0051] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0052] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0053] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0054] In the several embodiments provided in this application, it should be understood that the disclosed client can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, indirect coupling or communication connection between units or modules, and may be electrical or other forms.

[0055] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A separation structure, characterized in that, include: The first separation tank (1) has a first separation chamber (11) inside. The outer shell of the first separation tank (1) is provided with a first air inlet (12) and a first air outlet (13) communicating with the first separation chamber (11). The first separation chamber (11) is provided with a first flow guiding component (3) and a filter (4) so ​​that the fluid entering the first separation chamber (11) from the first air inlet (12) passes through the first flow guiding component (3) and the filter (4) in sequence and is discharged from the first air outlet (13). The first flow guiding component (3) is used to guide the fluid, and the filter (4) is used to filter the oil in the fluid. The second separation tank (5) is located outside the first separation chamber (11) and is connected to the first separation tank (1). The second separation tank (5) has a second separation chamber (51) inside. The second separation tank (5) has a second air inlet (52) and a second air outlet (53) communicating with the second separation chamber (51). The second separation tank (5) has a second flow guide assembly (6) for guiding fluid so that the fluid entering the second separation chamber (51) from the second air inlet (52) passes through the second flow guide assembly (6) and the second air outlet (53) in sequence and then enters the first air inlet (12). The second flow guiding component (6) includes a first baffle (61), a second baffle (62), and a third baffle (63). The first baffle (61), the second baffle (62), and the third baffle (63) are all disposed between two opposite inner walls of the second separation tank (5). The first baffle (61), the second baffle (62), and the third baffle (63) form a flow cavity (64). The second air inlet is on the inner wall of the second separation tank (5), and the second air inlet (52) communicates with the flow cavity (64).

2. The separation structure according to claim 1, characterized in that, The first separation tank (1) is provided with a flow-blocking component (14), which has a flow channel (141) and is connected to the first air outlet (13). The filter part (4) is provided in the flow channel (141). The flow-blocking component (14) and the side wall of the first separation tank (1) have a first flow-guiding channel (15). The first flow-guiding component (3) is provided in the first flow-guiding channel (15). The first air inlet (12) is connected to the first flow-guiding channel (15) so that the fluid flows into the flow channel (141) after passing through the first flow-guiding channel (15).

3. The separation structure according to claim 2, characterized in that, The first flow guiding component (3) includes a first flow guiding plate (31) located in the first flow guiding channel (15). The first flow guiding plate (31) is connected to one end of the flow blocking component (14) away from the flow channel (141). The first flow guiding plate (31) is arranged around the flow blocking component (14). The first flow guiding plate (31) is provided with a first flow guiding port (311) for fluid flow.

4. The separation structure according to claim 3, characterized in that, There are multiple first guide vanes (31), which are arranged at intervals; the first guide ports (311) between two adjacent first guide vanes (31) are arranged opposite to each other; and / or, The first flow guiding assembly (3) further includes a second flow guiding plate (32) disposed on the inner wall of the first separation chamber (11). The second flow guiding plate (32) is disposed around the flow blocking component (14). The second flow guiding plate (32) is provided with a second flow guiding port for fluid to pass through. The second flow guiding plate (32) is located between two adjacent first flow guiding plates (31).

5. The separation structure according to claim 2, characterized in that, The first separation tank (1) includes a tank body (101) and a cover (102) covering the tank body (101), the first air outlet (13) is disposed on the cover (102), and the flow-blocking component (14) is connected to the cover (102); The first separator (1) is provided with a liquid storage tank (103) at one end away from the cover (102), and the first separator (1) is provided with an oil return pipe (104) communicating with the liquid storage tank (103); the second separator (5) is provided with an oil guide pipe (54) communicating with the first separator (1), one end of the oil guide pipe (54) is connected to the bottom of the second separator (5), and the other end of the oil guide pipe (54) is connected to the liquid storage tank (103).

6. The separation structure according to claim 5, characterized in that, One end of the first baffle (61) is connected to the second baffle (62), and the other end of the first baffle (61) is connected to the third baffle (63). The second baffle (62) and the third baffle (63) are arranged at intervals. The flow cavity (64) is located between the second baffle (62) and the third baffle (63). The second baffle (62) and / or the third baffle (63) have a second flow channel (65) between them and the inner wall of the second separation tank (5), so that the fluid in the flow cavity (64) enters the second air outlet (53) through the second flow channel (65).

7. The separation structure according to claim 6, characterized in that, The second baffle (62) and / or the third baffle (63) are provided with a first liquid-blocking plate (66) on the side away from the flow cavity (64). One end of the first liquid-blocking plate (66) is connected to a first connecting portion that is connected to the second baffle (62) or the third baffle (63), and the other end of the first liquid-blocking plate (66) extends downward toward the first connecting portion.

8. The separation structure according to claim 7, characterized in that, The inner wall of the second separation tank (5) is provided with a second baffle plate (67). One end of the second baffle plate (67) has a second connecting part that connects to the inner wall of the second separation tank (5), and the other end of the second baffle plate (67) extends downward toward the second connecting part. There are multiple first baffle plates (66) and multiple second baffle plates (67). In the vertical direction, multiple first baffle plates (66) and multiple second baffle plates (67) are arranged alternately.

9. The separation structure according to claim 5, characterized in that, The separation structure also includes an air inlet pipe (7), which is inserted into the second air inlet (52). The air inlet pipe (7) penetrates the flow cavity (64) and abuts against the inner wall of the second separation tank (5). An air inlet channel (72) is provided inside the air inlet pipe (7), and a second air outlet (53) is provided on the side wall of the air inlet pipe (7). The first air inlet (12) and the air inlet channel (72) are connected through the second air outlet (53).

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