Oil separator

Abstract

The utility model provides an oil separator which comprises a barrel, an air inlet pipe, an oil return pipe, an air outlet pipe and a check valve. The air inlet pipe and the oil return pipe are connected to the barrel. The air outlet pipe is connected to the cylinder, one end of the air outlet pipe extends into the cylinder, and the other end of the air outlet pipe extends out of the cylinder. The check valve is arranged at the end, located in the barrel, of the air outlet pipe and used for limiting the medium of the air outlet pipe to only flow out of the barrel, and the check valve is a gravity type check valve. Through the structural design, the reverse non-return function on the gas outlet passage of the oil separator is achieved through the gravity type non-return valve, media such as gas of an external pipeline are prevented from flowing into the barrel through the gas outlet pipe, the reverse flow phenomenon is avoided, and the stability and reliability of the oil separator are improved.

Description

Technical Field

[0001] This disclosure relates to the technical field of refrigeration system-related equipment, and in particular to an oil separator. Background Technology

[0002] In existing oil separator designs, the oil separator includes a cylinder and an outlet pipe connected to the cylinder, which allows gas to be discharged from the cylinder. However, in actual use, depending on the application method, under certain circumstances, gases or other media from external pipelines may flow into the cylinder through the outlet pipe, causing backflow and affecting the stability and reliability of the oil separator. Utility Model Content

[0003] A primary objective of this disclosure is to overcome at least one of the deficiencies of the prior art described above and to provide an oil separator capable of achieving a reverse check function in the gas outlet passage.

[0004] To achieve the above objectives, the present disclosure adopts the following technical solution:

[0005] According to one aspect of this disclosure, an oil separator is provided, comprising a cylinder, an inlet pipe, an oil return pipe, an outlet pipe, and a check valve; the inlet pipe and the oil return pipe are respectively connected to the cylinder; the outlet pipe is connected to the cylinder, one end of the outlet pipe extends into the cylinder, and the other end extends out of the cylinder; the check valve is disposed at the end of the outlet pipe located inside the cylinder, for restricting the medium in the outlet pipe to flow only out of the cylinder, and the check valve is a gravity check valve.

[0006] According to one embodiment of this disclosure, the check valve includes a valve tube, a valve seat, and a valve core; the valve tube is connected to the outlet pipe and has a valve cavity; the valve seat is connected to the valve tube and has a valve hole extending axially along the valve tube, the valve hole communicating with the valve cavity; the valve core is movably disposed in the valve cavity; wherein, when the medium in the valve tube flows in the direction of flowing out of the cylinder, the valve core and the valve seat are spaced apart, so that the medium entering the valve cavity through the valve hole flows through the flow channel between the valve core and the valve tube; when the medium in the valve tube flows in from the outside, the valve core blocks the valve hole to isolate the flow between the valve cavity and the cylinder.

[0007] According to one embodiment of this disclosure, the valve core includes a body and at least two tail fins; the tail fins are connected to the periphery of the body and extend axially away from the valve seat, and at least two tail fins are arranged circumferentially spaced along the body; wherein, when the medium in the valve pipe flows in the direction of flowing out of the cylinder, the area between the body and the valve pipe that is not occupied by the tail fins is the flow channel.

[0008] According to one embodiment of this disclosure, the check valve further includes a limiting structure comprising two limiting arms and a connecting arm; the limiting arms are fixed in the valve cavity and extend axially, one end of the limiting arm is connected to the valve seat, and a portion of the limiting arm is located in the region between two adjacent tail fins to restrict the circumferential rotation of the valve core; the connecting arm is connected between the ends of the two limiting arms away from the valve seat, the connecting arm is located on the side of the valve core facing away from the valve seat, and the connecting arm is used to restrict the axial movement of the valve core away from the valve seat.

[0009] According to one embodiment of this disclosure, the valve seat has an assembly hole on its end face facing the valve core, and one end of the limiting arm is inserted into the assembly hole.

[0010] According to one embodiment of this disclosure, the inner diameter of the valve tube is larger than the inner diameter of the air outlet tube, and a transition surface is formed at the connection between the inner wall of the valve tube and the inner wall of the air outlet tube; wherein, the other end of the limiting arm abuts against the transition surface.

[0011] According to one embodiment of the present disclosure, the air outlet pipe includes a first part and a second part connected axially; the first part is located inside the cylinder and is the valve pipe; one end of the second part is connected to the first part, and the other end extends out of the cylinder, and the second part is fixedly connected to the cylinder.

[0012] According to one embodiment of this disclosure, the valve seat includes an assembly portion having a stepped structure having a stepped surface perpendicular to the axial direction, the stepped surface being annular, and the end of the valve pipe away from the outlet pipe being connected to the stepped surface.

[0013] According to one embodiment of this disclosure, the vent pipe is made of stainless steel; and the end of the vent pipe extending out of the cylinder is connected to a vent connector.

[0014] According to one embodiment of this disclosure, the oil separator further includes an oil filter; the oil filter is disposed on the side of the check valve away from the vent pipe.

[0015] As can be seen from the above technical solution, the advantages and positive effects of the oil separator proposed in this disclosure are as follows:

[0016] The oil separator disclosed herein includes a cylinder, an outlet pipe, and a check valve. The outlet pipe is connected to the cylinder, with one end extending into the cylinder and the other end extending out of the cylinder. The check valve is located at the end of the outlet pipe inside the cylinder to restrict the flow of the medium from the outlet pipe to the cylinder. The check valve is a gravity-type check valve. Through the above structural design, this disclosure utilizes a gravity-type check valve to achieve a reverse check function in the outlet path of the oil separator, preventing gas or other media from external pipelines from flowing into the cylinder through the outlet pipe, thus avoiding backflow and improving the stability and reliability of the oil separator. Furthermore, by placing the check valve inside the cylinder, this disclosure eliminates the need for the outlet pipe of the oil separator to connect to other check valves outside the cylinder, reducing the number of external connection points of the oil separator. Simultaneously, the absence of a longer section of the outlet pipe extending out of the cylinder helps save on piping and reduce costs. Attached Figure Description

[0017] The various objectives, features, and advantages of this disclosure will become more apparent from the following detailed description of preferred embodiments of the disclosure taken in conjunction with the accompanying drawings. The drawings are merely illustrative illustrations of the disclosure and are not necessarily drawn to scale. In the drawings, the same reference numerals always denote the same or similar parts. Wherein:

[0018] Figure 1 This is a schematic diagram of an oil separator according to an exemplary embodiment;

[0019] Figure 2 yes Figure 1 The image shows a shaft side sectional view of the oil separator;

[0020] Figure 3 yes Figure 2 An enlarged schematic diagram of the vent pipe and check valve is shown.

[0021] Figure 4 yes Figure 3 An enlarged schematic diagram of part A in the diagram;

[0022] Figure 5 and Figure 6 These are enlarged schematic diagrams of the oil separator in two different states.

[0023] Figure 7 yes Figure 4 A schematic diagram of the valve seat, valve core, and limiting structure is shown.

[0024] Figure 8 yes Figure 7 An enlarged schematic diagram of the valve core is shown;

[0025] Figure 9 yes Figure 7 An enlarged schematic diagram of the valve seat is shown.

[0026] The annotations in the attached figures are explained as follows:

[0027] 100. Cylinder body;

[0028] 200. Intake pipe;

[0029] 300. Return oil pipe;

[0030] 400. Exhaust pipe;

[0031] 401. Transition surface;

[0032] 410. Part One;

[0033] 420. Part Two;

[0034] 430. Vent connector;

[0035] 500. Check valve;

[0036] 5101. Valve cavity;

[0037] 520. Valve seat;

[0038] 5201. Valve orifice;

[0039] 5202. Assembly hole;

[0040] 521. Stepped surface;

[0041] 530. Valve core;

[0042] 5301. Weight reduction hole;

[0043] 531.Ontology;

[0044] 532. Tail fin;

[0045] 540. Limiting structure;

[0046] 541. Limiting arm;

[0047] 542. Connecting arm;

[0048] 600. Oil filter. Detailed Implementation

[0049] Typical embodiments embodying the features and advantages of this disclosure will be described in detail in the following description. It should be understood that this disclosure can have various variations in different embodiments without departing from the scope of this disclosure, and the descriptions and drawings therein are illustrative in nature and not intended to limit this disclosure.

[0050] In the following description of various exemplary embodiments of this disclosure, reference is made to the accompanying drawings, which form part of this disclosure, and which illustrate by way of example different exemplary structures, systems, and steps that can implement various aspects of this disclosure. It should be understood that other specific embodiments of the components, structures, exemplary devices, systems, and steps may be used, and structural and functional modifications may be made without departing from the scope of this disclosure. Furthermore, while the terms “above,” “between,” “within,” etc., may be used in this specification to describe different exemplary features and elements of this disclosure, these terms are used herein only for convenience, such as the orientation according to the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of this disclosure.

[0051] See Figure 1 The diagram illustrates a typical structural schematic of the oil separator proposed in this disclosure. In this exemplary embodiment, the oil separator proposed in this disclosure is described using an application in a refrigeration system as an example. It will be readily understood by those skilled in the art that various modifications, additions, substitutions, deletions, or other changes may be made to the specific embodiments described below in order to apply the relevant designs of this disclosure to other types of application scenarios, and these changes shall still be within the scope of the principles of the oil separator proposed in this disclosure.

[0052] like Figure 1 As shown, in one embodiment of this disclosure, the oil separator proposed in this disclosure includes a cylinder 100, an air inlet pipe 200, an oil return pipe 300, an air outlet pipe 400, and a check valve 500. Figure 1 (Not shown). See also for related information. Figures 2 to 9 , Figure 2 The image shows a representative axial sectional view of the oil separator;

[0053] Figure 3 The diagram shows a typical enlarged view of the vent pipe 400 and the check valve 500; Figure 4 China representatively shows Figure 3 An enlarged schematic diagram of part A in the diagram; Figure 5 and Figure 6 The diagrams show enlarged portions of the oil separator in two different states, representing representative examples. Figure 5 The cross-sectional view of the check valve 500 in its normal flow state is shown in detail. Figure 6 The cross-sectional view of the check valve 500 in the plugged check state is shown in detail; Figure 7 The diagram shows a representative structural schematic of the valve seat 520, valve core 530, and limiting structure 540. Figure 8 An enlarged schematic diagram of valve core 530 is shown in the figure. Figure 9An enlarged schematic diagram of valve seat 520 is shown in the figure. The structure, connection method, and functional relationship of the main components of the oil separator proposed in this disclosure will be described in detail below with reference to the above figures.

[0054] like Figures 1 to 6 As shown, in one embodiment of this disclosure, the air inlet pipe 200 and the oil return pipe 300 are respectively connected to the cylinder 100. The air outlet pipe 400 is connected to the cylinder 100, with one end of the air outlet pipe 400 extending into the cylinder 100 and the other end extending out of the cylinder 100. A check valve 500 is disposed at the end of the air outlet pipe 400 located inside the cylinder 100. The check valve 500 can restrict the medium to flow out of the cylinder 100 only through the air outlet pipe 400, and the check valve 500 is a gravity check valve. Through the above structural design, this disclosure utilizes the gravity check valve 500 to achieve the reverse check function on the air outlet passage of the oil separator, preventing gas and other media from external pipelines from flowing into the cylinder 100 through the air outlet pipe 400, avoiding backflow, and improving the stability and reliability of the oil separator. Furthermore, this disclosure places the check valve 500 inside the cylinder 100, eliminating the need for the oil separator's vent pipe 400 to connect to other check valves outside the cylinder 100, thus reducing the number of external connection points for the oil separator. At the same time, the portion of the vent pipe 400 extending out of the cylinder 100 is reserved for a longer length, which helps save on piping and reduce costs.

[0055] like Figures 4 to 6As shown, in one embodiment of this disclosure, the check valve 500 may include a valve tube, a valve seat 520, and a valve core 530. The valve tube (e.g., the first part 410 of the vent pipe 400 described below) is connected to the vent pipe 400, and the valve tube has a valve cavity 5101. The valve seat 520 is connected to the valve tube, and the valve seat 520 is provided with a valve hole 5201 extending axially along the valve tube, the valve hole 5201 communicating with the valve cavity 5101. The valve core 530 is movably disposed within the valve cavity 5101. Based on this, when the medium in the valve tube flows in the direction of the outlet cylinder 100 (i.e., forward), under the pressure of the medium, the valve core 530 moves away from the valve seat 520 and is spaced apart from the valve seat 520. At this time, the medium that enters the valve cavity 5101 through the valve hole 5201 can flow through the flow channel between the valve core 530 and the valve tube (for example, the flow channel between the body 531 and the inner wall of the valve tube that is not occupied by the tail fin 532, and the flow space is formed between adjacent tail fins and the inner wall of the valve tube, which is also the flow channel), and can be discharged through the vent pipe 400. Furthermore, when the medium in the valve pipe flows from the outside, that is, when the flow trend of the medium in the valve pipe is towards the direction of flowing into the cylinder 100 (i.e., reverse), under the pressure of the medium, the valve core 530 moves towards the valve seat 520 and comes into contact with the valve seat 520. At this time, the valve core 530 blocks the valve hole 5201. At this time, the valve core 530 can cut off the flow between the cylinder and the valve cavity on the outlet pipe, so that the medium cannot flow between the valve cavity 5101 and the cylinder 100. This can prevent the fluid in the cylinder from flowing into the valve cavity and then flowing out through the outlet pipe, and prevent reverse flow in the outlet pipe.

[0056] like Figures 4 to 8 As shown, based on the structural design of the check valve 500 including the valve core 530, in one embodiment of this disclosure, the valve core 530 may include a body 531 and at least two tail wings 532. The tail wings 532 are connected to the periphery of the body 531, and the tail wings 532 extend axially away from the valve seat 520, with at least two tail wings 532 arranged circumferentially spaced along the body 531. Based on this, when the medium in the valve pipe flows in the direction of exiting the cylinder 100, the area between the body 531 and the valve pipe not occupied by the tail wings 532 is the aforementioned flow channel. Through the above structural design, this disclosure utilizes the valve core 530 including the body 531 and tail wings 532 to form the aforementioned flow channel, thereby realizing the flow of the check valve 500 under normal flow conditions. Furthermore, by utilizing the design of at least two tail fins 532, the flow space between the valve core 530 and the valve cavity 5101 is divided into at least two flow channels, which helps to improve the stability of the valve core 530 moving axially within the valve cavity 5101 and further reduces the risk of the valve core 530 deflecting.

[0057] like Figures 4 to 7As shown, based on the structural design of at least two tail fins 532, in one embodiment of this disclosure, the check valve 500 may further include a limiting structure 540. The limiting structure 540 includes two limiting arms 541 and a connecting arm 542. The limiting arms 541 are fixed in the valve cavity 5101 and extend axially. One end of the limiting arm 541 is connected to the valve seat 520. A portion of the limiting arm 541 is located in the area between two adjacent tail fins 532. Accordingly, when the valve core 530 rotates circumferentially by a certain angle, the tail fins 532 abut against the limiting arm 541, preventing the valve core 530 from continuing to rotate, thereby limiting the circumferential rotation of the valve core 530. The connecting arm 542 connects the ends of the two limiting arms 541 that are away from the valve seat 520. The connecting arm 542 is located on the side of the valve core 530 facing away from the valve seat 520 and is used to limit the axial movement of the valve core 530 away from the valve seat 520. Through the above structural design, this disclosure can limit the circumferential rotation of the valve core 530 by using the limiting arm 541, and at the same time limit the axial movement of the valve core 530 by using the connecting arm 542.

[0058] like Figure 7 and Figure 9 As shown, based on the design of the limiting structure 540 including the limiting arm 541, in one embodiment of this disclosure, the limiting arm 541 extends axially, and one end of the limiting arm 541 can be connected to the valve seat 520. Furthermore, an assembly hole 5202 can be provided on the end face of the valve seat 520 facing the valve core 530, and one end of the limiting arm 541 can be inserted into the assembly hole 5202. Through the above structural design, this disclosure connects the limiting arm 541 to the assembly hole 5202 of the valve seat 520, using the valve seat 520 to fix the limiting arm 541, resulting in a reliable connection and a simple structure.

[0059] like Figure 4 and Figure 5 As shown, based on the structural design of the check valve 500 including the limiting structure 540, in one embodiment of this disclosure, the inner diameter of the valve pipe can be larger than the inner diameter of the outlet pipe 400. Accordingly, a transition surface 401 can be formed at the connection between the inner wall of the valve pipe and the inner wall of the outlet pipe 400. Furthermore, the other end of the limiting arm 541 (i.e., the end away from the valve seat 520) abuts against the transition surface 401. Through the above structural design, this disclosure utilizes the variable diameter design of the valve pipe and the outlet pipe 400 to form the transition surface 401, thereby positioning the limiting structure 540. The structure is simple and easy to implement.

[0060] like Figures 3 to 6As shown, in one embodiment of this disclosure, the vent pipe 400 may include a first portion 410 and a second portion 420 connected axially. The first portion 410 is located inside the cylinder 100 and can serve as the valve pipe of the check valve 500. One end of the second portion 420 is connected to the first portion 410, and the other end extends out of the cylinder 100; the second portion 420 is fixedly connected to the cylinder 100. In other words, the valve pipe of the check valve 500 and the vent pipe 400 can be designed as a single unit. Through the above structural design, this disclosure utilizes a portion of the vent pipe 400 as the valve pipe of the check valve 500, which helps to reduce the number of parts and lower the assembly difficulty.

[0061] Based on the structural design of the first part 410 of the vent pipe 400 as the valve pipe of the check valve 500, in one embodiment of this disclosure, when the inner diameter of the valve pipe is larger than the inner diameter of the vent pipe 400, it is equivalent to the inner diameter of the first part 410 being larger than the inner diameter of the second part 420. In other words, the vent pipe 400 can adopt a reducing pipe structure.

[0062] like Figure 9 As shown, based on the structural design of the check valve 500 including the valve seat 520, in one embodiment of this disclosure, the valve seat 520 may include an assembly part, which may be provided with a stepped structure. The stepped structure has a stepped surface 521 perpendicular to the axial direction. The stepped surface 521 is annular, and the end of the valve tube away from the outlet pipe 400 (or the end of the first part 410 away from the second part 420) is connected to the stepped surface 521. Through the above structural design, this disclosure can realize the planar connection between the assembly part of the valve seat 520 and the valve tube (or the outlet pipe 400). When using, for example, laser welding process to connect the valve seat 520 and the valve tube, it is more conducive to the implementation of the laser welding process, and it is suitable for realizing the assembly process of connecting the end of the valve tube to the stepped structure and then welding it for fixation. The process is simple and does not require a pre-positioning fixture.

[0063] like Figure 9 As shown, based on the structural design of the check valve 500 including the valve core 530, in one embodiment of this disclosure, the valve core 530 may be provided with a weight reduction hole 5301. For example, the weight reduction hole 5301 may be provided on the body 531 of the valve core 530. Through the above design, this disclosure can reduce the weight of the valve core 530 and reduce the material cost of the valve core 530.

[0064] like Figures 1 to 3 As shown, in one embodiment of this disclosure, the vent pipe 400 can be made of stainless steel, and the end of the vent pipe 400 extending out of the cylinder 100 is connected to a vent connector 430. Through the above structural design, the oil separator can use the vent connector 430 to connect the vent pipe 400 to related components.

[0065] Based on the structural design of the exhaust pipe 400 connected to the exhaust connector 430, in one embodiment of this disclosure, taking the exhaust pipe 400 as being made of stainless steel, the exhaust connector 430 can be made of copper, specifically, for example, red copper or brass. Through the above design, for application scenarios where the relevant components are made of copper, such as when the components and pipes of a refrigeration system are made of copper, this disclosure can utilize the exhaust connector 430 to achieve an effective connection between the exhaust pipe 400 and the relevant components. In other embodiments of this disclosure, when the relevant components are made of stainless steel, this disclosure may also omit the exhaust connector 430, in which case the end of the exhaust pipe 400 extending out of the cylinder 100 can be directly connected to the relevant components, and is not limited to the above embodiments.

[0066] like Figures 3 to 6 As shown, in one embodiment of this disclosure, the oil separator may further include an oil filter 600. The oil filter 600 is disposed on the side of the check valve 500 away from the outlet pipe 400; for example, the oil filter 600 is disposed on the side of the valve seat 520 opposite to the valve plate. Accordingly, after the oil-containing refrigerant enters the oil separator, some of the lubricating oil is filtered out by the internal action of the oil separator. The refrigerant with a relatively low oil content then passes through the oil filter 600, where some of the lubricating oil is further filtered before entering the check valve 500, thereby improving the overall oil separation effect of the oil separator.

[0067] like Figures 3 to 6 As shown, based on the structural design of the oil separator including the oil filter 600, in one embodiment of this disclosure, the oil filter 600 can be a mesh-like structure.

[0068] Based on the structural design of the oil separator including the oil filter 600, in one embodiment of this disclosure, the oil filter 600 can be made of stainless steel. For example, the oil filter 600 with a mesh cover structure can be made of stainless steel mesh.

[0069] It should be noted that the oil separators shown in the accompanying drawings and described in this specification are merely a few examples among many oil separators capable of employing the principles of this disclosure. It should be clearly understood that the principles of this disclosure are by no means limited to any detail or component of the oil separators shown in the accompanying drawings or described in this specification.

[0070] In summary, the oil separator proposed in this disclosure includes a cylinder 100, an outlet pipe 400, and a check valve 500. The outlet pipe 400 is connected to the cylinder 100, with one end extending into the cylinder 100 and the other end extending out of the cylinder 100. The check valve 500 is located at the end of the outlet pipe 400 located inside the cylinder 100, and is used to restrict the medium in the outlet pipe 400 to flow only out of the cylinder 100. The check valve 500 is a gravity check valve. Through the above structural design, this disclosure utilizes the gravity check valve 500 to achieve a reverse check function in the outlet passage of the oil separator, preventing gas and other media from external pipelines from flowing into the cylinder 100 through the outlet pipe 400, avoiding backflow, and improving the stability and reliability of the oil separator. Furthermore, this disclosure places the check valve 500 inside the cylinder 100, eliminating the need for the oil separator's vent pipe 400 to connect to other check valves outside the cylinder 100, thus reducing the number of external connection points for the oil separator. At the same time, the portion of the vent pipe 400 extending out of the cylinder 100 is reserved for a longer length, which helps save on piping and reduce costs.

[0071] The exemplary embodiments of the oil separator proposed in this disclosure have been described and / or illustrated in detail above. However, the embodiments of this disclosure are not limited to the specific embodiments described herein; rather, components and / or steps of each embodiment may be used independently and separately from other components and / or steps described herein. Each component and / or step of one embodiment may also be used in combination with other components and / or steps of other embodiments. In describing the elements / components / etc. described and / or illustrated herein, the terms “a,” “an,” and “the above” are used to indicate the presence of one or more elements / components / etc. The terms “comprising,” “including,” and “having” are used to indicate an open-ended inclusion and to mean that additional elements / components / etc. may exist in addition to those listed. Furthermore, the terms “first” and “second” in the claims and description are used only as illustrative marks and are not intended to limit the numerical scope of the object.

[0072] Although the oil separator proposed in this disclosure has been described according to different specific embodiments, those skilled in the art will recognize that modifications may be made to the implementation of this disclosure within the spirit and scope of the claims.

Claims

1. An oil separator characterized by, The utility model relates to a kind of air filter, including: Cylinder (100); Air inlet pipe (200) and oil return pipe (300) are connected to the cylinder (100) respectively; Air outlet pipe (400) is connected to the cylinder (100), one end of the air outlet pipe (400) extends into the cylinder (100), and the other end extends out of the cylinder (100); Check valve (500) is arranged at the end of the air outlet pipe (400) in the cylinder (100), to limit the medium of the air outlet pipe (400) only can flow out of the cylinder (100), the check valve (500) is gravity type check valve.

2. The oil separator of claim 1, wherein The check valve (500) includes: Valve pipe is connected to the air outlet pipe (400) and has valve cavity (5101); Valve seat (520) is connected to the valve pipe and is provided with valve hole (5201) through the axial direction of the valve pipe, the valve hole (5201) is communicated with the valve cavity (5101); Valve core (530) is movably arranged in the valve cavity (5101); Wherein, the medium flow direction in the valve pipe is the direction of flowing out of the cylinder (100), the valve core (530) is arranged with the valve seat (520) interval, to make the medium that enters the valve cavity (5101) via the valve hole (5201) flow through the flow-through passage between the valve core (530) and the valve pipe, the medium flow direction in the valve pipe is from outside, the valve core (530) blocks the valve hole (5201), to cut off the flow between the valve cavity (5101) and the cylinder (100).

3. The oil separator of claim 2, wherein The valve core (530) includes: Body (531); At least two tail wings (532), the tail wing (532) is connected to the periphery of the body (531), the tail wing (532) extends along the axial direction away from the valve seat (520), at least two the tail wing (532) is arranged along the circumference of the body (531) interval; Wherein, the medium flow direction in the valve pipe is the direction of flowing out of the cylinder (100), the area between the body (531) and the valve pipe not occupied by the tail wing (532) is the flow-through passage.

4. The oil separator of claim 3, wherein The check valve (500) further includes limiting structure (540), and the limiting structure (540) includes: Two limiting arms (541), the limiting arm (541) is fixed in the valve cavity (5101) and extends along the axial direction, one end of the limiting arm (541) is connected to the valve seat (520), a part of the limiting arm (541) is located between the adjacent two tail wings (532) region, to limit the rotation of the valve core (530) along the circumference; Connecting arm (542) is connected between the end of two limiting arms (541) away from the valve seat (520), the connecting arm (542) is located on the side of the valve core (530) away from the valve seat (520), and the connecting arm (542) is used to limit the movement of the valve core (530) along the axial direction away from the valve seat (520).

5. The oil separator of claim 4, wherein An assembly hole (5202) is arranged on an end face of the valve seat (520) facing the valve core (530), and one end of the limiting arm (541) is inserted into the assembly hole (5202).

6. The oil separator of claim 4, wherein An inner diameter of the valve pipe is greater than an inner diameter of the air outlet pipe (400), and a transition surface (401) is formed at a connection between an inner wall of the valve pipe and an inner wall of the air outlet pipe (400); wherein the other end of the limiting arm (541) abuts against the transition surface (401).

7. The oil separator of claim 2, wherein The air outlet pipe (400) comprises a first part (410) and a second part (420) connected in an axial direction; the first part (410) is located in the cylinder body (100), and the first part (410) is the valve pipe; one end of the second part (420) is connected to the first part (410), and the other end of the second part (420) extends out of the cylinder body (100), and the second part (420) is fixedly connected to the cylinder body (100).

8. The oil separator of claim 2, wherein The valve seat (520) comprises an assembly part, the assembly part is provided with a stepped structure, the stepped structure has a stepped surface (521) perpendicular to the axial direction, the stepped surface (521) is annular, and an end of the valve pipe away from the air outlet pipe (400) is connected to the stepped surface (521).

9. The oil separator of claim 1, wherein The air outlet pipe (400) is made of stainless steel, and an end of the air outlet pipe (400) extending out of the cylinder body (100) is connected to an air outlet joint (430).

10. The oil separator of claim 1, wherein The oil separator further comprises: An oil filter (600) is arranged on a side of the check valve (500) away from the air outlet pipe (400).

Images