Oil separator

Abstract

The utility model relates to the technical field of refrigeration, in particular to an oil separator. An oil separator comprises a shell, and an air outlet is formed in the top of the shell in the height direction of the shell. A gas inlet is formed in one end of the gas inlet pipe, the gas inlet pipe penetrates into the shell, and gas-liquid mixed fluid conveyed into the shell through the gas inlet flows in the shell from the gas inlet in the first spiral direction; the filtering structure is arranged in the shell and is positioned between the air inlet and the air outlet; the filtering structure is provided with a filtering flow channel, and the air inlet direction of the filtering flow channel is opposite to the flowing direction of the first spiral direction. And the filtering load of the filtering structure is small, long-time high efficiency and high separation rate can be met, and the filtering effect is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration, in particular to an oil separator. BACKGROUND

[0002] The oil separator is commonly used to separate the lubricating oil in the high-pressure steam discharged by the refrigeration compressor in the system. In order to enhance the separation effect, the existing oil separator is provided with filter structures such as filter screens and fillers on the front side of the gas outlet pipe to adsorb small oil droplets and oil mist that cannot naturally settle by the filter structures. However, in this way, too many small oil droplets directly enter the filter structures, resulting in a large filtering load of the filter structures, and the filtering and separation effect still cannot reach the ideal state. CONTENT OF THE UTILITY MODEL

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

[0004] An oil separator comprises:

[0005] A shell, a gas outlet being provided at the top of the shell along the height direction of the shell;

[0006] An air inlet pipe, one end of the air inlet pipe being provided with an air inlet and penetrating into the interior of the shell, the gas-liquid mixed fluid transported into the interior of the shell from the air inlet flowing in the shell along a first spiral direction;

[0007] A filter structure being provided in the shell and located between the air inlet and the gas outlet; the filter structure being provided with a filter flow channel, the air inlet direction of the filter flow channel being opposite to the flow direction of the first spiral direction.

[0008] In one of the embodiments, the filter flow channel comprises a plurality of flow channel inlets, the plurality of flow channel inlets being annularly and spacedly distributed along the circumference of the shell, and the air inlet direction of each of the plurality of flow channel inlets being opposite to the flow direction of the first spiral direction; and / or, each of the plurality of flow channel inlets is provided with a lower convex structure, one end of the lower convex structure being connected to the flow channel inlet along the height direction of the shell, and the other end of the lower convex structure being lower than the plane on which the flow channel inlet is located and being provided with an opening.

[0009] In one of the embodiments, each of the plurality of flow channel inlets is provided with an upper convex structure, one end of the upper convex structure being connected to the flow channel inlet along the height direction of the shell, and the other end of the upper convex structure being higher than the plane on which the flow channel inlet is located and being provided with an opening.

[0010] In one of the embodiments, the center line of the air inlet pipe is provided as X1, the annular center line of the plurality of flow channel inlets is provided as X2, and X1 and X2 satisfy the tangential relationship or the intersecting relationship.

[0011] In one of the embodiments, the radius of the annular center line is set as R1, the radius of the shell is set as R, R1 and R satisfy the relationship: R1≥1 / 2R; and / or, the center line of the shell is set as X3, X3 and X1 satisfy the parallel relationship, the distance between X3 and X1 is set as D1, the width of the air inlet pipe is set as D, D1 and D satisfy the relationship: D1≥1 / 2D.

[0012] In one of the embodiments, the filter structure comprises a filter plate and a first filter arranged above the filter plate, and the filter flow channel is arranged on the filter plate; along the height direction of the shell, the filter plate separates the shell into a first chamber and a second chamber arranged in an upper and lower manner, and the filter flow channel communicates the first chamber and the second chamber; the air inlet is in communication with the second chamber, and the air outlet is in communication with the first chamber.

[0013] In one of the embodiments, the filter structure further comprises a cover shell and a second filter, the cover shell is arranged outside the first filter, and the bottom is connected with the filter plate; the side of the cover shell away from the filter plate is provided with a communication port; the second filter is arranged on the cover shell, and the second filter is arranged on at least one of the cover shell and the filter plate.

[0014] In one of the embodiments, the air inlet pipe comprises a first pipe body and a second pipe body in communication with each other, one end of the second pipe body is in communication with the first pipe body, the other end is provided with the air inlet and penetrates into the inside of the shell.

[0015] In one of the embodiments, the diameter of the second pipe body is greater than the diameter of the first pipe body.

[0016] In one of the embodiments, the end of the air inlet pipe penetrating into the inside of the shell is provided with an inclined notch.

[0017] In one of the embodiments, the shell is provided with a limiting structure, and the limiting structure fixes the filter structure and the shell.

[0018] In one of the embodiments, the shell is provided with a first limiting part and a second limiting part, and the filter structure is arranged between the first limiting part and the second limiting part.

[0019] In one of the embodiments, the first limiting part is arranged close to the air outlet, the second limiting part is arranged close to the air inlet pipe, the first limiting part is an inclined surface or an inner convex structure on the shell, and the second limiting part is an inner convex structure on the shell.

[0020] Compared with the prior art, in the present application, the gas-liquid mixed fluid delivered into the shell through the air inlet flows in the first spiral direction in the shell from the air inlet, and the gas-liquid mixed fluid is preliminarily separated in the shell during the flow process. The oil separator can avoid the gas-liquid mixed fluid flowing into the shell through the air inlet directly entering the filter flow channel by opening the filter flow channel opposite to the spiral flow direction of the gas-liquid mixture in the filter structure, thereby greatly reducing the small oil droplets entering the filter structure, reducing the filtering load of the filter structure, and meeting the requirements of long-time high efficiency and high separation rate, and guaranteeing the filtering effect. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 The oil separator provided by the present application is provided with a cross-sectional structure diagram.

[0023] Figure 2 The oil separator provided by the present application is provided with a schematic diagram.

[0024] Figure 3 The Figure 2 The cross-sectional view along the B-B line.

[0025] Figure 4 The filter structure provided by the present application is provided with a schematic diagram.

[0026] Figure 5 The filter structure provided by the present application is provided with an exploded view.

[0027] Figure 6 The filter structure provided by the present application is provided with a cross-sectional schematic diagram.

[0028] The drawings are as follows: 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, bevel cut; 3, filter structure; 3a, filter flow channel; 31, filter plate; 32, first filter; 33, cover; 34, second filter; 35, communication port; 4, flow channel inlet; 41, upper convex structure; 42, lower convex structure; 51, first limiting portion; 52, second limiting portion; 6, air outlet pipe; 7, oil outlet pipe. DETAILED DESCRIPTION

[0029] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the detailed description of the specific embodiments of the present application is made below with reference to the accompanying drawings. In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways other than those described herein, and one of ordinary skill in the art can make similar improvements without departing from the scope of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0030] It is to be noted that when a component is referred to as being "on" or "disposed on" another component, it can be directly on the other component or there can be intervening components present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or there can be intervening components present. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar terms as used in the description of the specification are for the purpose of illustration only and do not indicate the only orientation of the embodiments.

[0031] In addition, the terms "first", "second", and the like, are used merely to describe the features and do not imply or suggest relative importance or a number of the features indicated. Thus, the features defined with "first", "second" can include at least one of the features explicitly or implicitly. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0032] In the present application, unless otherwise explicitly specified and limited, the "on", "under", "above", and "over" of a first feature to a second feature can be that the first feature is in direct contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, the "above", "over", and "on" of the first feature to the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is horizontally higher than the second feature. The "below", "under", and "under" of the first feature to the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is horizontally lower than the second feature.

[0033] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more of the related listed items.

[0034] Please refer to Figures 1 to 6The oil separator provided by the application comprises a shell 1, an air inlet pipe 2 and a filter structure 3. The top of the shell 1 is provided with an air outlet 11 in the height direction of the shell 1. The air inlet pipe 2 is provided with an air inlet 21 at one end and penetrates into the shell 1. The gas-liquid mixed fluid delivered into the shell 1 from the air inlet 21 flows in the shell in a first spiral direction. The filter structure 3 is arranged in the shell 1 between the air inlet 21 and the air outlet 11. The filter structure 3 is provided with a filter flow channel 3a. The air inlet direction of the filter flow channel 3a is opposite to the flow direction of the first spiral direction.

[0035] It can be understood that the gas-liquid mixture is delivered into the shell 1 from the air inlet pipe 2 and spirally flows to the air outlet 11. During the process, the gas-liquid mixture is in a centrifugal state. Large oil droplets are thrown to the inner wall of the shell 1 under the action of centrifugal force. Small oil droplets flow to the air outlet 11 together with the gas flow. When the gas flow reaches the position of the filter structure 3, the filter flow channel 3a guides the gas flow to flow in the opposite direction of the original spiral flow direction. The gas flow can be floated into the filter flow channel 3a due to the light mass, while the small oil droplets cannot generate reverse action due to the heavy mass, and thus are basically in a static state at the inlet of the filter flow channel 3a and naturally fall downward, effectively avoiding the oil droplets from entering the filter structure 3. Basically, only oil mist enters, the filter load of the filter structure 3 is small, and even if used for a long time, too much oil will not be accumulated, the good filtering and separating effect can be maintained, the oil separator can meet the long-time high efficiency and high separation rate, the filtering effect is guaranteed, and the oil return efficiency is improved.

[0036] Secondly, in the separation mode of centrifugation + condensation filtration, only a special filter flow channel 3a is added to the filter structure 3, and a good separation effect is obtained. Compared with the mode of setting inner and outer chambers and spiral baffles, the structure is simpler and the manufacturing cost is lower. The overall structure of the oil separator is basically not changed, and the processing is easier.

[0037] In an embodiment, the filter flow channel comprises a plurality of flow channel inlets 4. The plurality of flow channel inlets 4 are annularly and spacedly distributed in the circumferential direction of the shell 1, and the air inlet directions of the plurality of flow channel inlets 4 are opposite to the flow direction of the first spiral direction.

[0038] In an embodiment, the plurality of flow channel inlets 4 are respectively provided with lower convex structures 42. In the height direction of the shell 1, one end of the lower convex 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 provided with an opening. The end of the lower convex structure 42 connected to the flow channel inlet 4 is arranged in the direction of the spiral flow of the gas-liquid mixture in the shell 1, and the opening is arranged in the opposite direction.

[0039] Understandably, when the airflow moves to the position of the annularly distributed plurality of flow passage inlets 4, the airflow enters the flow passage inlets 4 in a direction opposite to the spiral flow, the original spiral flow is completely disrupted, and the movement of the oil droplets is decelerated. At the same time, the oil droplets collide with the lower convex structure 42 at this position, further decelerating the oil droplets, so that the oil droplets no longer have initial power and then sink downward, ensuring good separation effect.

[0040] Secondly, only the plurality of flow passage inlets 4 and the lower concave structure need to be provided, without the need to set a spiral or a curved channel and other complex operations, the processing is more convenient, and the manufacturing cost is low.

[0041] For example, the number of flow passage 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 described here.

[0042] Preferably, the position where the lower convex structure 42 is connected with the flow passage inlet 4 is a circular arc transition structure, which effectively avoids the oil droplets from excessively rebounding and entering the flow passage inlet 4 in the opposite direction when rotating, further reducing the possibility of the oil droplets entering the filter structure 3.

[0043] For example, along the height direction of the shell 1, the cross section of the lower convex structure 42 is an arc structure, and the lower convex structure 42 is arranged at the flow passage inlet 4, and the opening of the lower convex structure 42 is connected with the flow passage inlet 4 in communication. It is ensured that the airflow can only enter the flow passage inlet 4 from the opening, and is always in a state of flowing to the flow passage inlet 4 after colliding with the lower convex structure 42.

[0044] Of course, it is not limited to this, and in other embodiments, the cross section of the lower convex structure 42 can also adopt other regular or irregular shapes, which have the same flow function.

[0045] As shown in Figure 3 The center line of the air inlet pipe 2 is set as X1, and the annular center line of the plurality of flow passage inlets 4 is set as X2, X1 and X2 satisfy the tangential relationship or the intersection relationship. Preferably, the two are tangential. When the two are tangential, the air inlet amount of the filter structure 3 is relatively large, and has a relatively high gas-liquid separation effect, and the separation efficiency is high.

[0046] Further, the radius of the annular center line is set as R1, and the radius of the shell 1 is set as R, R1 and R satisfy the relationship: R1≥1 / 2R. The fluid entering the inside of the shell 1 through the air inlet pipe 2 is easy to produce turbulence near the center position, and as the radius X1 increases, it is more conducive to the separation of the fluid through the filter, while avoiding the reverse flow of the fluid when the fluid is turbulent, avoiding the liquid phase flowing out through the air inlet 21.

[0047] Exemplarily, the value of R1 can adopt 1 / 2R, 2 / 3R, 3 / 4R, 4 / 5R, etc. Of course, the value of R1 can also select corresponding values according to actual conditions, which will not be described here.

[0048] In an embodiment, the center line of the cross section of the shell 1 is set as X3, X3 and X1 satisfy the parallel relationship, the distance between X3 and X1 is set as D1, and the width of the inlet pipe 2 is set as D, D1 and D satisfy the relationship: D1≥1 / 2D. The eccentricity of the inlet pipe 2 is achieved, and the outlet position is not too close to the center position, which ensures that the airflow input by the inlet pipe 2 can form a rotational flow in the shell 1.

[0049] Exemplarily, the value of D1 can adopt 1 / 2D, 2 / 3D, 3 / 4D, 4 / 5D, etc. Of course, the value of D1 can also select corresponding values according to actual conditions, which will not be described here.

[0050] In an embodiment, the plurality of flow channel inlets 4 are respectively provided with upper convex structures 41. Along the height direction of the shell 1, one end of the upper convex structure 41 is connected with the flow channel inlet 4, and the other end is higher than the plane where the flow channel inlet 4 is located and is provided with an opening. The end of the upper convex structure 41 connected with the flow channel inlet 4 is arranged towards the direction of the spiral flow of the gas-liquid mixture in the shell 1, and the opening is arranged in the opposite direction.

[0051] It can be understood that the existence of the upper convex structure 41 increases the area of the flow channel inlet 4, and plays a certain guiding role for the gas, so that the gas flowing in the opposite direction is more easily floated into the flow channel inlet 4.

[0052] Preferably, the position of the upper convex structure 41 connected with the flow channel inlet 4 is a circular arc transition structure, which guides more smoothly.

[0053] Exemplarily, along the height direction of the shell 1, the cross section of the upper convex structure 41 is an arc structure, and the upper convex structure 41 is arranged at the flow channel inlet 4, and the opening of the upper convex structure 41 is connected with the flow channel inlet 4. It is ensured that the airflow can only enter the flow channel inlet 4 from the opening, and the airflow is guided from multiple angles to ensure that the airflow can quickly float into the flow channel inlet 4.

[0054] Of course, it is not limited to this, and in other embodiments, the cross section of the upper convex structure 41 can also adopt other regular or irregular shapes, which have the same flow function.

[0055] In an embodiment, the plurality of flow channel inlets 4 can also be provided with upper convex structures 41 and lower convex structures 42, which 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 above structure, which will not be described here.

[0056] As Figures 4-6As shown, the filtering structure 3 comprises a filtering plate 31 and a first filtering element 32. The first filtering element 32 is arranged above the filtering plate 31, and the filtering flow channel 3a is arranged on the filtering plate 31. Along the height direction of the shell 1, the filtering plate 31 divides the shell 1 into a first chamber 100 and a second chamber 200 arranged in a top-bottom manner, and the filtering flow 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 by the air inlet pipe 2, and the airflow is in a spiral flow and centrifugal motion in the second chamber 200 to throw out large oil droplets. Then, the airflow flows to the first chamber 100, and small oil droplets are naturally settled after being processed by the filtering flow channel 3a on the filtering plate 31. The oil mist is filtered by the first filtering element 32, and the completely separated gas is finally output from the air outlet 11. The filtering plate 31 completes the support of the first filtering element 32 and the arrangement of the filtering flow channel, and the structure is simple and easy to form.

[0058] Preferably, the filtering flow channel 3a can be directly and integrally formed with the filtering plate 31, such as die casting, which is convenient to process.

[0059] Exemplarily, the first filtering element 32 is arranged as a filler, which can adsorb the oil mist. Of course, the first filtering element 32 can also be made of other materials capable of adsorbing the oil mist, which can be selected according to actual needs.

[0060] Further, the filtering structure 3 further comprises a cover 33 and a second filtering element 34. The cover 33 covers the first filtering element 32, and the bottom of the cover 33 is connected to the filtering plate 31. The second filtering element 34 is arranged on at least one of the cover 33 and the filtering plate 31. The side of the cover 33 away from the filtering plate 31 is provided with a communication port 35, which connects the inside of the cover 33 and the air outlet 11. For example, the second filtering element 34 is arranged on the cover 33.

[0061] Understandably, after the cover 33 is connected to the filtering plate 31, a box body is formed, so that the filtering structure 3 is arranged independently relative to the shell 1, which is not only convenient to process, but also easy to maintain and replace in the later period, and reduces the requirement for the structure of the shell 1. After being filtered by the first filtering element 32, the airflow can be further filtered by the second filtering element 34, so that the separation effect is improved, and the filtered gas flows from the communication port 35 to the air outlet 11.

[0062] Exemplarily, two second filtering elements 34 are arranged on the bottom and the top of the cover 33 and are fixedly connected to the cover 33. The first filtering element 32 is arranged between the two second filtering elements 34. Preferably, the second filtering element 34 is arranged as a filter screen, and the filter screen and the filler are used together to filter, so that the filtering effect is good.

[0063] Exemplarily, the second filter 34 is arched upward in the middle, facilitating the filtered oil to slide downward.

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

[0065] Further, the limiting structure comprises a first limiting part 51 and a second limiting part 52, and the filter structure 3 is arranged 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, without the need for a connecting member or the like therebetween, and the structure is simpler.

[0066] Further, the first limiting part 51 is arranged close to the air outlet 11, and the second limiting part 52 is arranged close to the air inlet pipe 2. The first limiting part 51 is a slope or an inner convex structure on the housing 1, and the second limiting part 52 is an inner convex structure on the housing 1.

[0067] Exemplarily, the first limiting part 51 is arranged as a necked structure on the upper end of the housing 1, and the second limiting part 52 is arranged as a necked structure on the housing 1 corresponding to the lower part of the filter structure 3, and the filter structure 3 is limited in the two necked structures, avoiding position movement. In another embodiment, the first limiting part and the second limiting part can be designed as a structure of a press groove on the housing, and the press groove forms an inner convex structure inside the housing to limit and fix the filter structure. Figure 1 As shown, the first limiting part can also be a slope on the housing 1, which stops and limits the upper end of the filter structure, and a press groove on the housing is arranged as the second limiting part, so as to fix the filter structure on the housing.

[0068] In an embodiment, the air inlet pipe 2 comprises a first pipe body 22 and a second pipe body 23 in communication with each other, one end of the second pipe body 23 is in communication with the first pipe body 22, and the other end is provided with an air inlet 21 and penetrates into the inside of the housing 1. The diameter of the second pipe body 23 is greater than that of the first pipe body 22.

[0069] Understandably, the air inlet pipe 2 is designed to change the diameter, and the first pipe body 22 connected to the exhaust port of the compressor is lifted to a large pipe diameter (i.e. the second pipe body 23) before the oil separator, which reduces the flow rate, and is beneficial to reduce the kinetic energy of the oil droplets to make them precipitate in the oil separator.

[0070] Preferably, the second pipe body 23 is arranged as an elbow. The air inlet pipe 2 is designed to turn after changing the diameter, so that the jet flow after changing the diameter does not disperse, and forms a fluid with uniform flow rate after interacting with the pipe wall when passing through the elbow, which is not easy to form turbulence, and the effect of later centrifugal separation is better.

[0071] Further, the air inlet pipe 2 is provided with a bevel cut 24 at the end penetrating into the shell 1. The bevel cut 24 is arranged from the side close to the center of the shell 1 to the side far from the center of the shell 1. The existence of the bevel can guide the air flow when the air is discharged, facilitating the formation of a cyclone.

[0072] Of course, not limited to this, in other embodiments, it can also be designed as a non-bevel flat end face.

[0073] Further, the direction of the air inlet 21 to the shell 1 is intersected with the radial direction of the shell 1, which ensures the formation of a cyclone in the shell 1.

[0074] Further, the air outlet 11 is provided with an air outlet pipe 6, and the air flow is discharged outward through the air outlet pipe 6. The bottom of the shell 1 is connected with an oil outlet pipe 7, and the settled oil is discharged through the oil outlet pipe 7.

[0075] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0076] The above-mentioned embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as the limitation of the patent application scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An oil separator characterized by, The utility model relates to a filter structure and a filter device, and relates to the technical field of filter devices. The utility model discloses a filter device, which comprises a shell (1), an air inlet pipe (2) and a filter structure (3). The air inlet pipe (2) is provided with an air inlet (21) at one end and penetrates into the shell (1). The filter structure (3) is arranged in the shell (1) and located between the air inlet (21) and the air outlet (11).

2. The oil separator of claim 1, wherein The filter structure (3) is provided with a filter flow channel (3a).

3. The oil separator of claim 2, wherein The filter flow channel (3a) comprises a plurality of flow channel inlets (4) which are annularly and spacedly distributed along the circumference of the shell and have air inlet directions opposite to the flow direction of the first spiral direction.

4. The oil separator of claim 2, wherein The flow channel inlets (4) are respectively provided with lower convex structures (42) which are connected to the flow channel inlets (4) at one end and lower than the plane where the flow channel inlets (4) are located at the other end.

5. The oil separator of claim 4, wherein The flow channel inlets (4) are respectively provided with upper convex structures (41) which are connected to the flow channel inlets (4) at one end and higher than the plane where the flow channel inlets (4) are located at the other end.

6. The oil separator of claim 1, wherein The center line of the air inlet pipe (2) is X1, the annular center line of the flow channel inlets (4) is X2, X1 and X2 satisfy the tangential relationship or the intersection relationship. The radius of the annular center line is R1, the radius of the shell (1) is R, R1 and R satisfy the relationship: R1 >= 1 / 2R. The filter structure (3) comprises a filter plate (31) and a first filter (32) arranged above the filter plate (31). The filter flow channel (3a) is arranged on the filter plate (31). The filter plate (31) divides the shell (1) into a first chamber (100) and a second chamber (200) which are distributed above and below along the height direction of the shell (1). The filter flow channel (3a) communicates the first chamber (100) and the second chamber (200). The air inlet (21) communicates with the second chamber (200), and the air outlet (11) communicates with the first chamber (100).

7. The oil separator of claim 6, wherein The filter structure (3) further comprises a cover (33) and a second filter (34), the cover (33) covers the first filter (32) and is connected to the filter plate (31) at the bottom, a communication port (35) is arranged on the side of the cover (33) away from the filter plate (31), and the second filter (34) is arranged on at least one of the cover (33) and the filter plate (31).

8. The oil separator according to any of claims 1-7, characterized in that The air inlet pipe (2) comprises a first pipe body (22) and a second pipe body (23) in communication with each other, one end of the second pipe body (23) is in communication with the first pipe body (22), the other end is provided with the air inlet (21) and penetrates into the inside of the shell (1).

9. The oil separator of claim 8, wherein The diameter of the second pipe body (23) is greater than that of the first pipe body (22).

10. The oil separator of claim 9, wherein The air inlet pipe (2) is provided with an oblique cut (24) at the end penetrating into the inside of the shell (1).

11. The oil separator of claim 10, wherein The shell (1) is provided with a limiting structure, which fixes the filter structure (3) and the shell (1).

12. The oil separator of claim 11, wherein, The limiting structure comprises a first limiting part (51) and a second limiting part (52), and the filter structure (3) is arranged between the first limiting part (51) and the second limiting part (52).

13. The oil separator of claim 12, wherein, The first limiting part (51) is arranged close to the air outlet (11), the second limiting part (52) is arranged close to the air inlet pipe (2), the first limiting part is an inclined surface or an inner convex structure on the shell (1), and the second limiting part (52) is an inner convex structure on the shell (1).

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