Oil separator

Abstract

The application relates to the refrigeration technical field, in particular to an oil separator. An oil separator comprises a shell, a gas outlet is arranged at the top of the shell along the height direction of the shell; an air inlet pipe is arranged at one end of the air inlet pipe and penetrates into the shell, a gas-liquid mixed fluid transported into the shell from the air inlet pipe flows in the shell along a first spiral direction from the air inlet pipe; a filter structure is arranged in the shell and located between the air inlet pipe and the gas outlet; the filter structure is provided with a filter flow channel, and the air inlet direction of the filter flow channel is opposite to the flow direction of the first spiral direction. The filter load of the filter structure is small, long-time high efficiency and high separation rate can be achieved, and the filtering effect is guaranteed.

Description

Technical Field

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

[0002] Oil separators are commonly used in systems to separate lubricating oil from the high-pressure vapor discharged from refrigeration compressors. To enhance the separation effect, existing oil separators have filter structures such as screens and packing materials installed before the outlet pipe to adsorb small oil droplets and oil mist that fail to settle naturally. However, with this method, too many small oil droplets directly enter the filter structure, resulting in a large filtration load and the separation effect still not reaching the ideal state. Summary of the Invention

[0003] Therefore, it is necessary to provide an oil separator with good oil separation performance.

[0004] An oil separator, comprising:

[0005] The housing has an air outlet at its top along its height direction;

[0006] An air inlet pipe has an air inlet at one end and extends into the interior of the housing. A gas-liquid mixture fluid is delivered into the housing through the air inlet and flows in the housing along a first spiral direction.

[0007] A filter structure is disposed within the housing, located between the air inlet and the air outlet; the filter structure has a filter channel, the air inlet direction of the filter channel being opposite to the flow direction of the first spiral direction.

[0008] In one embodiment, the filter channel includes multiple channel inlets, which are distributed in a ring-shaped interval along the circumference of the housing, and the air intake direction is opposite to the first spiral flow direction; and / or, each of the multiple channel inlets is provided with a downward protruding structure, one end of which is connected to the channel inlet along the height direction of the housing, and the other end is lower than the plane where the channel inlet is located, and is provided with an opening.

[0009] In one embodiment, each of the plurality of flow channel inlets is provided with an upwardly protruding structure; along the height direction of the housing, one end of the upwardly protruding structure is connected to the flow channel inlet, and the other end is higher than the plane where the flow channel inlet is located, and is provided with an opening.

[0010] In one embodiment, the centerline of the intake pipe is set as X1, and the annular centerline of the plurality of flow channel inlets is set as X2, wherein X1 and X2 satisfy a tangent relationship or an intersecting relationship.

[0011] In one embodiment, the radius of the annular centerline is set to R1, the radius of the housing is set to R, and R1 and R satisfy the relationship: R1≥1 / 2R; and / or, the centerline of the housing is set to X3, X3 and X1 satisfy the parallel relationship, the distance between X3 and X1 is set to D1, and the width of the intake pipe is set to D, and D1 and D satisfy the relationship: D1≥1 / 2D.

[0012] In one embodiment, the filter structure includes a filter plate and a first filter element disposed above the filter plate, and the filter channel is formed on the filter plate; along the height direction of the housing, the filter plate divides the housing into a first chamber and a second chamber distributed vertically, and the filter channel connects the first chamber and the second chamber; the air inlet is connected to the second chamber, and the air outlet is connected to the first chamber.

[0013] In one embodiment, the filter structure further includes a cover and a second filter element. The cover is disposed over the first filter element and its bottom is connected to the filter plate. A communication opening is provided on the side of the cover away from the filter plate. The second filter element is disposed on the cover and is disposed on at least one of the cover and the filter plate.

[0014] In one embodiment, the air intake pipe includes a first pipe and a second pipe that are interconnected. One end of the second pipe is connected to the first pipe, and the other end has the air intake port and extends into the interior of the housing.

[0015] In one embodiment, the diameter of the second tube is larger than the diameter of the first tube.

[0016] In one embodiment, the intake pipe has a beveled end that extends into the housing.

[0017] In one embodiment, the housing is provided with a limiting structure that fixes the filter structure to the housing.

[0018] In one embodiment, the housing is provided with a first limiting part and a second limiting part, and the filter structure is disposed between the first limiting part and the second limiting part.

[0019] In one embodiment, the first limiting part is disposed near the air outlet, and the second limiting part is disposed near the air inlet pipe. The first limiting part is an inclined surface or an inwardly convex structure on the housing, and the second limiting part is an inwardly convex structure of the housing.

[0020] Compared with the prior art, in this application, the gas-liquid mixture fluid introduced into the housing through the air inlet flows in the housing along the first spiral direction from the air inlet. During the flow, the gas-liquid mixture fluid undergoes preliminary separation in the housing. The oil separator, by opening a filter channel on the filter structure that is opposite to the spiral flow direction of the gas-liquid mixture, can prevent the gas-liquid mixture fluid flowing into the housing through the air inlet from directly entering the filter channel, thereby greatly reducing the small oil droplets entering the filter structure. The filter structure has a smaller filtration load, which can meet the requirements of high efficiency and high separation rate for a long time and ensure the filtration effect. Attached Figure Description

[0021] 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.

[0022] Figure 1 This is a schematic cross-sectional view of the oil separator provided in this application.

[0023] Figure 2 A schematic diagram of the oil separator provided in this application.

[0024] Figure 3 for Figure 2 Cross-sectional view along line BB.

[0025] Figure 4 This is a schematic diagram of the filter structure provided in this application.

[0026] Figure 5 An exploded view of the filter structure provided in this application.

[0027] Figure 6 This is a cross-sectional schematic diagram of the filter structure provided in this application.

[0028] Reference numerals: 1. Shell; 100. First chamber; 200. Second chamber; 11. Air outlet; 2. Air inlet pipe; 21. Air inlet; 22. First pipe body; 23. Second pipe body; 24. Angled cut; 3. Filter structure; 3a. Filter channel; 31. Filter plate; 32. First filter element; 33. Cover; 34. Second filter element; 35. Connecting port; 4. Channel inlet; 41. Upper convex structure; 42. Lower convex structure; 51. First limiting part; 52. Second limiting part; 6. Air outlet pipe; 7. Oil outlet pipe. Detailed Implementation

[0029] 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.

[0030] It should be noted that when a component is referred to as being "fixed to" or "set on" 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Please see Figures 1 to 6This application provides an oil separator, including a housing 1, an air inlet pipe 2, and a filter structure 3. An air outlet 11 is provided at the top of the housing 1 along its height direction. One end of the air inlet pipe 2 has an air inlet 21 that extends into the housing 1. A gas-liquid mixture is introduced into the housing 1 through the air inlet 21 and flows within the housing in a first spiral direction. The filter structure 3 is located inside the housing 1, between the air inlet 21 and the air outlet 11. The filter structure 3 has a filter channel 3a, the air inlet direction of which is opposite to the flow direction of the first spiral direction.

[0035] Understandably, the gas-liquid mixture is transported to the interior of the housing 1 through the inlet pipe 2 and flows spirally towards the outlet 11 inside. During this process, the gas-liquid mixture is in a centrifugal state, and larger oil droplets are thrown to the inner wall of the housing 1 under the action of centrifugal force. Smaller oil droplets flow with the airflow towards the outlet 11. When they reach the location of the filter structure 3, the filter channel 3a guides the airflow to flow in the opposite direction to the original spiral flow. Because the airflow is lighter, it can drift back into the filter channel 3a, while the small oil droplets are heavier and cannot reverse the flow. As a result, they remain basically stationary at the inlet of the filter channel 3a and naturally settle down, effectively preventing oil droplets from entering the filter structure 3. Only oil mist enters. The filter structure 3 has a small filtration load, and even after long-term use, it will not accumulate too much oil, always maintaining a good filtration and separation effect. This allows the oil separator to meet the requirements of high efficiency and high separation rate for a long time, ensuring the filtration effect and improving the oil return efficiency.

[0036] Secondly, in the centrifugal + condensation filtration separation method, a good separation effect is achieved simply by adding a special filter channel 3a to the filter structure 3. Compared with methods such as setting inner and outer chambers or spiral baffles, the structure is simpler and the manufacturing cost is lower. It essentially does not change the overall structure of the oil separator, making it easier to process.

[0037] In one embodiment, the filter channel includes a plurality of channel inlets 4, which are arranged in a ring-shaped interval along the circumference of the housing 1, and the air intake direction is opposite to the first spiral flow direction.

[0038] In one embodiment, multiple flow channel inlets 4 are each provided with a downwardly protruding structure 42. Along the height direction of the housing 1, one end of the downwardly protruding structure 42 is connected to the flow channel inlet 4, and the other end is lower than the plane where the flow channel inlet 4 is located, and is open. The end of the downwardly protruding structure 42 connected to the flow channel inlet 4 is oriented towards the direction of the spiral flow of the gas-liquid mixture in the housing 1, and the direction of the opening is reversed.

[0039] Understandably, when the airflow reaches the multiple annularly distributed inlet 4, it enters the inlet 4 in the opposite direction to the spiral flow, completely disrupting the original spiral flow and slowing down the movement of the oil droplets. At the same time, the oil droplets collide with the convex structure 42 at this position, further slowing down the oil droplets, so that the oil droplets no longer have initial momentum and thus settle downwards, ensuring a good separation effect.

[0040] Secondly, it can be achieved simply by opening multiple flow channel inlets 4 and a concave structure, without the need for complex operations such as spirals and bends, making the processing simpler and the manufacturing cost lower.

[0041] For example, the number of flow channel inlets 4 can be 2, 3, 4, 5, 6, 7, etc. Of course, the corresponding value can also be selected according to the actual situation, which will not be elaborated here.

[0042] Preferably, the position where the convex structure 42 connects to the flow channel inlet 4 is an arc transition structure, which effectively avoids excessive rebound of oil droplets when they rotate at this point, causing them to enter the flow channel inlet 4 in the opposite direction, and further reduces the possibility of oil droplets entering the filter structure 3.

[0043] For example, along the height direction of the shell 1, the cross-section of the convex structure 42 is arc-shaped, and the convex structure 42 covers the flow channel inlet 4, with the opening of the convex structure 42 connected to the flow channel inlet 4. This ensures that the airflow can only enter the flow channel inlet 4 from the opening, and always flows into the flow channel inlet 4 only after colliding with the convex structure 42.

[0044] Of course, this is not the only option. In other embodiments, the cross-section of the convex structure 42 may also take other regular or irregular shapes, while having the same flow function.

[0045] like Figure 3 As shown, the centerline of the air intake pipe 2 is set as X1, and the annular centerline of the multiple flow channel inlets 4 is set as X2. X1 and X2 are either tangent or intersecting. Preferably, they are tangent. When they are tangent, the air intake of the filter structure 3 is relatively large, resulting in a relatively high gas-liquid separation effect and high separation efficiency.

[0046] Furthermore, the radius of the annular centerline is set to R1, and the radius of the housing 1 is set to R. R1 and R satisfy the relationship: R1≥1 / 2R. Fluid entering the housing 1 through the air inlet pipe 2 is prone to turbulence near the center. As the radius X1 increases, it is more conducive to the separation of fluid through the filter element, while avoiding reverse flow of fluid when it is turbulent, and preventing the liquid phase from flowing out through the air inlet 21.

[0047] For example, R1 can be 1 / 2R, 2 / 3R, 3 / 4R, 4 / 5R, etc. Of course, the value of R1 can also be selected according to the actual situation, which will not be elaborated here.

[0048] In one embodiment, the centerline of the cross-section of the housing 1 is set as X3, X3 and X1 are parallel, the distance between X3 and X1 is set as D1, and the width of the intake pipe 2 is set as D, where D1 and D satisfy the relationship: D1≥1 / 2D. This achieves an eccentric setting of the intake pipe 2, and the outlet position is not too close to the center position, ensuring that the airflow input into the intake pipe 2 can form a swirling flow within the housing 1.

[0049] For example, the value of D1 can be 1 / 2D, 2 / 3D, 3 / 4D, 4 / 5D, etc. Of course, the value of D1 can also be selected according to the actual situation, which will not be elaborated here.

[0050] In one embodiment, multiple flow channel inlets 4 are each provided with an upwardly protruding structure 41. Along the height direction of the housing 1, one end of the upwardly protruding structure 41 is connected to the flow channel inlet 4, and the other end is higher than the plane where the flow channel inlet 4 is located, and is open. The end of the upwardly protruding structure 41 connected to the flow channel inlet 4 is oriented towards the direction of the spiral flow of the gas-liquid mixture inside the housing 1, and the direction of the opening is reversed.

[0051] Understandably, the presence of the convex structure 41 increases the area of ​​the flow channel inlet 4 and plays a certain guiding role for the gas, making it easier for the reverse-flowing gas to drift into the flow channel inlet 4.

[0052] Preferably, the position where the upper convex structure 41 connects to the flow channel inlet 4 is a rounded transition structure, which makes the guidance smoother.

[0053] For example, along the height direction of the shell 1, the cross-section of the convex structure 41 is arc-shaped, and the convex structure 41 covers the flow channel inlet 4, with the opening of the convex structure 41 connected to the flow channel inlet 4. This ensures that the airflow can only enter the flow channel inlet 4 from the opening, guiding the airflow from multiple angles to ensure that the airflow can quickly drift into the flow channel inlet 4.

[0054] Of course, this is not the only one. In other embodiments, the cross-section of the convex structure 41 may also take other regular or irregular shapes, while having the same flow function.

[0055] In one embodiment, multiple flow channel inlets 4 may also be provided with an upper convex structure 41 and a lower convex structure 42 to enhance the impact and guiding effect, and further improve the separation effect. The specific structure of the upper convex structure 41 and the lower convex structure 42 is the same as the structure described above, and will not be repeated.

[0056] like Figures 4-6As shown, the filter structure 3 includes a filter plate 31 and a first filter element 32. The first filter element 32 is positioned above the filter plate 31, and a filter channel 3a is formed on the filter plate 31. Along the height direction of the housing 1, the filter plate 31 divides the housing 1 into a first chamber 100 and a second chamber 200 distributed vertically. The filter channel 3a connects the first chamber 100 and the second chamber 200. The air inlet 21 is connected to the second chamber 200, and the air outlet 11 is connected to the first chamber 100.

[0057] Understandably, the airflow is delivered to the second chamber 200 through the intake pipe 2, where it spirals and then undergoes centrifugal motion, throwing out large oil droplets. It then flows into the first chamber 100, where it is processed by the filter channel 3a on the filter plate 31, causing small oil droplets to settle naturally. The oil mist is filtered by the first filter element 32, and finally, the completely separated gas is output from the outlet 11. The filter plate 31 provides support for the first filter element 32 and opens the filter channel, resulting in a simple structure that is easy to mold.

[0058] Preferably, the filter channel 3a can be directly integrally formed with the filter plate 31, such as by die casting, which is convenient for processing.

[0059] For example, the first filter element 32 is configured as a packing material capable of adsorbing oil mist. Of course, the first filter element 32 can also be made of other materials capable of adsorbing oil mist, which can be selected according to actual needs.

[0060] Furthermore, the filter structure 3 also includes a housing 33 and a second filter element 34. The housing 33 covers the first filter element 32 and its bottom is connected to the filter plate 31. The second filter element 34 is disposed on at least one of the housing 33 and the filter plate 31. The housing 33 has a connecting opening 35 on its side away from the filter plate 31, which connects the interior of the housing 33 to the air outlet 11. For example, the second filter element 34 is disposed on the housing 33.

[0061] Understandably, after the housing 33 and the filter plate 31 are connected, they form a box, making the filter structure 3 independent of the housing 1. This not only facilitates processing but also makes subsequent maintenance and replacement easier, while reducing the structural requirements of the housing 1. After the airflow is filtered by the first filter element 32, it can be filtered again by the second filter element 34. The double filtration improves the separation effect. The filtered gas flows from the connecting port 35 to the outlet 11.

[0062] For example, two second filter elements 34 are provided, respectively disposed at the bottom and top of the housing 33, and fixedly connected to the housing 33. A first filter element 32 is disposed between the two second filter elements 34. Preferably, the second filter element 34 is a filter screen, which, together with the packing material, provides good filtration.

[0063] For example, the middle of the second filter element 34 is arched upward to facilitate the downward flow of the filtered oil.

[0064] In one embodiment, the housing 1 is provided with a limiting structure, which fixes the filter structure 3 to the housing 1.

[0065] Furthermore, the limiting structure includes a first limiting part 51 and a second limiting part 52, and the filter structure 3 is disposed between the first limiting part 51 and the second limiting part 52. The filter structure 3 is directly limited by the first limiting part 51 and the second limiting part 52 on the housing 1, and there is no need to set up connecting parts or the like between the two, making the structure simpler.

[0066] Furthermore, the first limiting part 51 is disposed near the air outlet 11, and the second limiting part 52 is disposed near the air inlet pipe 2. The first limiting part 51 is an inclined surface or an inwardly convex structure on the housing 1, and the second limiting part 52 is an inwardly convex structure of the housing 1.

[0067] For example, the first limiting part 51 is configured as a constricted structure at the upper end of the housing 1, and the second limiting part 52 is configured as a constricted structure on the housing 1 corresponding to the lower part of the filter structure 3. The two constrictions confine the filter structure 3 within them, preventing positional movement. In other embodiments, the first and second limiting parts can be designed as inwardly pressing grooves within the housing, forming an inwardly convex structure inside the housing to limit and fix the filter structure. For example... Figure 1 As shown, the first limiting part can also be formed by an inclined surface on the housing 1, which stops and limits the upper end of the filter structure. At the same time, a pressure groove is provided on the housing as a second limiting part, so as to fix the filter structure on the housing.

[0068] In one embodiment, the air intake pipe 2 includes a first pipe body 22 and a second pipe body 23 that are interconnected. One end of the second pipe body 23 is connected to the first pipe body 22, and the other end has an air intake port 21 that extends into the housing 1. The diameter of the second pipe body 23 is larger than the diameter of the first pipe body 22.

[0069] Understandably, the variable diameter design of the intake pipe 2 raises the first pipe body 22, which connects to the compressor exhaust port, to a larger diameter (i.e., the second pipe body 23) before the oil separator, which reduces the flow rate and helps to reduce the kinetic energy of the oil droplets so that they settle in the oil separator.

[0070] Preferably, the second pipe body 23 is configured as a bend. The bend in the intake pipe 2 after the diameter change can prevent the jet from becoming dispersed after the diameter change. When passing through the bend, the interaction with the pipe wall forms a fluid with a uniform flow rate that enters the oil separator, making it less prone to turbulence and resulting in better centrifugal separation in the later stage.

[0071] Furthermore, the intake pipe 2 has a bevel 24 at one end that penetrates into the housing 1. The bevel 24 is inclined from the side of the intake pipe 2 closest to the center of the housing 1 to the side furthest from the center of the housing 1. The presence of the bevel helps to guide the airflow during exhaust, facilitating the formation of swirling air.

[0072] Of course, this is not the only option; in other embodiments, the end face can also be designed as a flat, non-sloping surface.

[0073] Furthermore, the direction in which the air inlet 21 supplies air to the housing 1 intersects with the radial direction of the housing 1, ensuring that the airflow forms a swirling flow inside the housing 1.

[0074] Furthermore, an air outlet pipe 6 is provided at the air outlet 11, through which airflow is discharged outward. An oil outlet pipe 7 is connected to the bottom of the housing 1, through which settled oil is discharged.

[0075] 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.

[0076] 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 housing (1) has an air outlet (11) at its top along the height direction of the housing (1); An air inlet pipe (2) is provided at one end of the air inlet pipe (2) and extends into the interior of the housing (1). The gas-liquid mixture fluid transported into the interior of the housing (1) by the air inlet (21) flows in the housing in the first spiral direction from the air inlet. A filter structure (3) is disposed inside the housing (1) and located between the air inlet (21) and the air outlet (11); the filter structure (3) has a filter channel (3a) and the air inlet direction of the filter channel (3a) is opposite to the flow direction of the first spiral direction.

2. The oil separator according to claim 1, characterized in that, The filter channel (3a) includes multiple channel inlets (4). Along the circumference of the housing, the multiple channel inlets (4) are distributed in a ring-shaped interval, and the air intake direction is opposite to the first spiral flow direction; and / or, the multiple channel inlets (4) are respectively provided with a downward protruding structure (42). Along the height direction of the housing (1), one end of the downward protruding structure (42) is connected to the channel inlet (4), and the other end is lower than the plane where the channel inlet (4) is located, and is open.

3. The oil separator according to claim 2, characterized in that, Each of the multiple flow channel inlets (4) is provided with an upward convex structure (41); along the height direction of the shell (1), one end of the upward convex structure (41) is connected to the flow channel inlet (4), and the other end is higher than the plane where the flow channel inlet (4) is located, and is open.

4. The oil separator according to claim 2, characterized in that, The centerline of the air intake pipe (2) is set as X1, and the annular centerline of the plurality of flow channel inlets (4) is set as X2. X1 and X2 satisfy a tangent relationship or an intersecting relationship.

5. The oil separator according to claim 4, characterized in that, The radius of the annular centerline is set to R1, the radius of the housing (1) is set to R, and R1 and R satisfy the relationship: R1≥1 / 2R; and / or, the centerline of the cross section of the housing (1) is set to X3, X3 and X1 satisfy the parallel relationship, the distance between X3 and X1 is set to D1, and the width of the air intake pipe (2) is set to D, and D1 and D satisfy the relationship: D1≥1 / 2D.

6. The oil separator according to claim 1, characterized in that, The filter structure (3) includes a filter plate (31) and a first filter element (32) disposed above the filter plate (31). The filter channel (3a) is opened on the filter plate (31). Along the height direction of the housing (1), the filter plate (31) divides the housing (1) into a first chamber (100) and a second chamber (200) distributed vertically. The filter channel (3a) connects the first chamber (100) and the second chamber (200). The air inlet (21) is connected to the second chamber (200), and the air outlet (11) is connected to the first chamber (100).

7. The oil separator according to claim 6, characterized in that, The filter structure (3) further includes a cover (33) and a second filter element (34). The cover (33) covers the first filter element (32) and its bottom is connected to the filter plate (31). The cover (33) has a communication port (35) on the side away from the filter plate (31). The second filter element (34) is provided on at least one of the cover (33) and the filter plate (31).

8. The oil separator according to any one of claims 1-7, characterized in that, The air intake pipe (2) includes a first pipe body (22) and a second pipe body (23) that are connected to each other. One end of the second pipe body (23) is connected to the first pipe body (22), and the other end is opened with the air intake port (21) and penetrates into the interior of the housing (1).

9. The oil separator according to claim 8, characterized in that, The diameter of the second tube (23) is greater than the diameter of the first tube (22).

10. The oil separator according to claim 9, characterized in that, The intake pipe (2) has a slanted cut (24) at one end when it enters the housing (1).

11. The oil separator according to claim 10, characterized in that, The housing (1) is provided with a limiting structure, which fixes the filter structure (3) to the housing (1).

12. The oil separator according to claim 11, characterized in that, The limiting structure includes a first limiting part (51) and a second limiting part (52), and the filter structure (3) is disposed between the first limiting part (51) and the second limiting part (52).

13. The oil separator according to claim 12, characterized in that, The first limiting part (51) is disposed near the air outlet (11), and the second limiting part (52) is disposed near the air inlet pipe (2). The first limiting part is an inclined surface or an inwardly convex structure on the housing (1), and the second limiting part (52) is an inwardly convex structure of the housing (1).

Images