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 one-way 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 one-way valve is arranged at the end, located in the cylinder, of the air outlet pipe and used for limiting the medium of the air outlet pipe to only flow out of the cylinder, and the one-way valve is a diaphragm type one-way valve. By means of the structural design, the reverse non-return function on the gas outlet passage of the oil separator is achieved through the diaphragm type one-way 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] The present disclosure relates to the technical field of refrigeration system related equipment, and in particular to an oil separator. BACKGROUND

[0002] In the prior art, the oil separator includes a cylinder and a gas outlet pipe connected to the cylinder, and the gas outlet pipe is used to discharge the gas in the cylinder. However, in actual use, the gas or other medium from the external pipeline will flow into the cylinder through the gas outlet pipe, causing reverse flow phenomenon, which affects the stability and reliability of the oil separator. CONTENT OF THE INVENTION

[0003] One of the main purposes of the present disclosure is to overcome at least one of the defects of the prior art, and to provide an oil separator capable of realizing the reverse check function of the gas outlet path.

[0004] To achieve the above-mentioned purpose, the present disclosure adopts the following technical solutions:

[0005] According to one aspect of the present disclosure, an oil separator is provided, which includes a cylinder, a gas inlet pipe, an oil return pipe, a gas outlet pipe and a one-way valve. The gas inlet pipe and the oil return pipe are respectively connected to the cylinder. The gas outlet pipe is connected to the cylinder, one end of the gas outlet pipe extends into the cylinder, and the other end extends out of the cylinder. The one-way valve is arranged at the end of the gas outlet pipe inside the cylinder, and is used to limit the medium in the gas outlet pipe to only flow out of the cylinder. The one-way valve is a diaphragm type one-way valve.

[0006] According to one of the embodiments of the present disclosure, the one-way valve includes a valve pipe, a valve seat and a valve sheet. The valve pipe is connected to the gas outlet pipe and has a valve cavity. The valve seat is connected to the valve pipe and is provided with a valve hole penetrating along the axial direction of the valve pipe, and the valve hole is in communication with the valve cavity. The valve sheet is movably arranged in the valve cavity, and has a middle region and an edge region. On the reference plane perpendicular to the axial direction, the orthogonal projection of the valve hole is entirely located within the orthogonal projection of the middle region, and the edge region is provided with a flow-through hole penetrating along the axial direction. When the flow direction of the medium in the valve pipe is the direction of flowing out of the cylinder, the valve sheet is arranged in spaced relation with the valve seat, so that the medium entering the valve cavity through the valve hole flows through the flow-through hole of the valve sheet. When the flow direction of the medium in the valve pipe is the direction of flowing from the outside, the valve sheet is in contact with the valve seat, and the middle region of the valve sheet blocks the valve hole, so that the medium cannot flow between the valve cavity and the cylinder.

[0007] According to one of the embodiments of the present disclosure, the edge region of the valve sheet is provided with at least two flow-through holes, and the at least two flow-through holes are arranged in spaced relation along the circumferential direction. In addition, the orthogonal projection of the flow-through hole is circular, elliptical or rectangular.

[0008] According to one of the embodiments of the present disclosure, the one-way valve further comprises a limiting structure; the limiting structure is arranged in the valve cavity and is used to limit the movement of the valve disc away from the valve seat in the axial direction.

[0009] According to one of the embodiments of the present disclosure, the limiting structure comprises a blocking seat; the blocking seat is arranged in the valve cavity, and the blocking seat comprises a blocking plate which is arranged in the axial direction away from the valve seat; when the flow direction of the medium in the valve pipe is the direction of flowing out of the cylinder body, the valve disc moves away from the valve seat in the axial direction to the maximum distance and abuts against the blocking plate.

[0010] According to one of the embodiments of the present disclosure, the inner diameter of the valve pipe is greater than the inner diameter of the air outlet pipe, and a transition surface is formed at the connection between the inner wall of the valve pipe and the inner wall of the air outlet pipe; the width of the valve disc is greater than the inner diameter of the air outlet pipe and less than or equal to the inner diameter of the valve pipe; when the flow direction of the medium in the valve pipe is the direction of flowing out of the cylinder body, the valve disc moves away from the valve seat in the axial direction to the maximum distance and abuts against the transition surface.

[0011] According to one of the embodiments of the present disclosure, the air outlet pipe comprises a first part and a second part which are connected in the axial direction; the first part is located in the cylinder body, and the first part is the valve pipe; one end of the second part is connected to the first part, and the other end of the second part extends out of the cylinder body; the second part is fixedly connected to the cylinder body.

[0012] According to one of the embodiments of the present disclosure, the valve seat comprises an assembly part which is provided with a stepped structure; the stepped structure has a stepped surface which is perpendicular to the axial direction; the stepped surface is annular; and the end of the valve pipe which is away from the air outlet pipe is connected to the stepped surface.

[0013] According to one of the embodiments of the present disclosure, the material of the air outlet pipe is stainless steel; and an air outlet connector is connected to the end of the air outlet pipe which extends out of the cylinder body.

[0014] According to one of the embodiments of the present disclosure, the oil separator further comprises an oil filter; the oil filter is arranged on the side of the one-way valve which is away from the air outlet pipe.

[0015] According to the above technical solution, the oil separator provided by the present disclosure has the following advantages and positive effects:

[0016] The oil separator provided by the present disclosure comprises a cylinder, an air outlet pipe and a one-way valve. The air outlet pipe is connected to the cylinder, one end of the air outlet pipe extends into the cylinder, and the other end extends out of the cylinder. The one-way valve is arranged at the end of the air outlet pipe inside the cylinder, so as to limit the medium of the air outlet pipe to only flow out of the cylinder. The one-way valve is a diaphragm type one-way valve. Through the above structure design, the present disclosure realizes the reverse check function of the air outlet passage of the oil separator by using the diaphragm type one-way valve, avoids the gas medium of the external pipeline flowing into the cylinder through the air outlet pipe, avoids the reverse flow phenomenon, and improves the stability and reliability of the oil separator. Furthermore, the one-way valve is arranged inside the cylinder, so that the air outlet pipe of the oil separator does not need to be connected with other one-way valves outside the cylinder, the number of external connection points of the oil separator is reduced, and at the same time, the part of the air outlet pipe extending out of the cylinder does not need to be reserved with a longer length, which is beneficial to save the pipeline and reduce the cost. BRIEF DESCRIPTION OF DRAWINGS

[0017] The various objects, features and advantages of the present disclosure will become more apparent from the following detailed description of preferred embodiments of the present disclosure, when considered in conjunction with the accompanying drawings. The drawings are not necessarily to scale, and in some instances, various components of the present disclosure can be shown exaggerated in scale or in somewhat schematic form, and again, details of the structure can be shown in block diagram form, in order to avoid obscuring the subject matter of the present disclosure. In the drawings:

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

[0019] Figure 2 is Figure 1 is an axial sectional view of the oil separator shown;

[0020] Figure 3 is Figure 2 is an enlarged schematic diagram of the air outlet pipe and the one-way valve shown;

[0021] Figure 4 is Figure 3 is an enlarged schematic diagram of part A in

[0022] Figure 5 is a partial enlarged schematic diagram of the oil separator in another state;

[0023] Figure 6 is Figure 4 is a planar schematic diagram of the valve disc shown;

[0024] Figure 7 is Figure 4 is a structural schematic diagram of the valve seat shown;

[0025] Figure 8 and Figure 9 are partial sectional views of an oil separator in two different states, respectively, according to another exemplary embodiment.

[0026] Reference numerals are explained as follows:

[0027] 100. Cylinder;

[0028] 200. Intake pipe;

[0029] 300. Oil return pipe;

[0030] 400. Outlet pipe;

[0031] 401. Transition surface;

[0032] 410. First portion;

[0033] 420. Second portion;

[0034] 430. Outlet fitting;

[0035] 500. One-way valve;

[0036] 5101. Valve cavity;

[0037] 520. Valve seat;

[0038] 5201. Valve hole;

[0039] 521. Step surface;

[0040] 530. Valve flap;

[0041] 5301. Flow-through hole;

[0042] 531. Middle region;

[0043] 532. Edge region;

[0044] 540. Stop seat;

[0045] 541. Stopper;

[0046] 600. Oil filter. DETAILED DESCRIPTION

[0047] The exemplary embodiments embodying the features and advantages of the present disclosure will be described in detail hereinafter. It should be understood that the present disclosure can have various changes in the embodiments, and all of the descriptions and drawings are essentially for the purpose of illustration, not for the purpose of limiting the present disclosure.

[0048] In the following description of various example embodiments of the present disclosure, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration various example structures, systems, and steps in which aspects of the present disclosure can be practiced. It is understood that other specific arrangements of parts, structures, example devices, systems, and steps can be utilized and structural and functional modifications can be made without departing from the scope of the present disclosure. Also, while the terms "over," "between," "inside," "on," "under," and the like, can be used in this specification to describe relative location, such terms are placed herein merely for convenience, e.g., based at least in part on the orientation of the examples as shown in the figures. Nothing in this specification should be construed as requiring a specific three dimensional orientation of structures in order to fall within the scope of the present disclosure.

[0049] Referring to Figure 1 , a structural schematic diagram of an oil separator according to the present disclosure is representatively shown. In this example embodiment, the oil separator according to the present disclosure is described by taking an application in a refrigeration system as an example. It is easy for those skilled in the art to understand that various modifications, additions, substitutions, deletions or other changes can be made to the following specific embodiments in order to apply the relevant design of the present disclosure to other types of application scenarios, and these changes are still within the scope of the principle of the oil separator according to the present disclosure.

[0050] As Figure 1 shown, in an embodiment of the present disclosure, the oil separator according to the present disclosure includes a cylinder 100, an air inlet pipe 200, an oil return pipe 300, an air outlet pipe 400, and a one-way valve 500 (not shown). For reference, see Figure 1 , a structural schematic diagram of the oil separator according to the present disclosure is representatively shown. Figures 2 to 7 , Figure 2 , an axial sectional view of the oil separator is representatively shown.

[0051] Figure 3 , an enlarged schematic diagram of the air outlet pipe 400 and the one-way valve 500 is representatively shown, in which the sectional structure of the one-way valve 500 in a normal flow state is specifically shown. Figure 4 , an enlarged schematic diagram of the A part in Figure 3 is representatively shown. Figure 5 , a partial enlarged schematic diagram of the oil separator in another state is representatively shown, in which the sectional structure of the one-way valve 500 in a block check state is specifically shown. Figure 6 , a plan schematic diagram of the valve plate 530 is representatively shown. Figure 7 , a structural schematic diagram of the valve seat 520 is representatively shown. The structure, connection mode and functional relationship of each main component of the oil separator according to the present disclosure will be described in detail below in combination with the above-mentioned drawings.

[0052] As Figures 1 to 5As shown, in an embodiment of the present disclosure, the gas inlet pipe 200 and the oil return pipe 300 are respectively connected to the cylinder body 100. The gas outlet pipe 400 is connected to the cylinder body 100, one end of the gas outlet pipe 400 extends into the cylinder body 100, and the other end of the gas outlet pipe 400 extends out of the cylinder body 100. The one-way valve 500 is arranged at the end of the gas outlet pipe 400 inside the cylinder body 100, the one-way valve 500 can restrict the medium to only flow out of the cylinder body 100 through the gas outlet pipe 400, and the one-way valve 500 is a diaphragm type one-way valve. Through the above structural design, the present disclosure realizes the reverse check function on the gas outlet passage of the oil separator by using the diaphragm type one-way valve 500, avoids the medium such as gas of the external pipeline to flow into the cylinder body 100 through the gas outlet pipe 400, avoids the reverse flow phenomenon, and improves the stability and reliability of the oil separator. Furthermore, the present disclosure arranges the one-way valve 500 inside the cylinder body 100, without the need for the gas outlet pipe 400 of the oil separator to be connected with other one-way valves outside the cylinder body 100, reduces the number of external connection points of the oil separator, and at the same time, without the need for the part of the gas outlet pipe 400 extending out of the cylinder body 100 to be reserved with a longer length, which is beneficial to save the pipeline and reduce the cost.

[0053] As Figures 3 to 5As shown, in one embodiment of this disclosure, the one-way valve 500 may include a valve tube, a valve seat 520, and a valve plate 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 has a valve cavity 5101. The valve seat 520 is connected to the valve tube and has a valve hole 5201 extending axially along the valve tube, communicating with the valve cavity 5101. The valve plate 530 is movably disposed in the valve cavity 5101 and has a central region 531 and an edge region 532. On a reference plane perpendicular to the axial direction, the orthographic projection of the valve hole 5201 is entirely within the orthographic projection range of the central region 531, and the edge region 532 has an axially extending flow hole 5301. Based on this, when the medium in the valve pipe flows in the direction of the outlet cylinder 100 (i.e., forward), under the pressure of the medium, the valve plate 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 hole 5301 of the valve plate 530, that is, flow through the flow hole 5301 to the outlet pipe 400 and be discharged through the outlet 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 flow), under the pressure of the medium, the valve plate 530 moves towards the valve seat 520 and contacts the valve seat 520. At this time, the middle region 531 of the valve plate 530 blocks the valve hole 5201. At this time, the valve plate 530 can cut off the flow between the cylinder 100 and the valve cavity on the outlet pipe 400, so that the medium cannot flow between the valve cavity 5101 and the cylinder 100, thereby preventing the fluid in the cylinder from flowing into the valve cavity and then flowing out through the outlet pipe, and preventing reverse flow in the outlet pipe. In other words, the middle region 531 of the valve plate 530 corresponds to the region of the valve hole 5201, and the edge region 532 of the valve plate 530 with the flow hole 5301 corresponds to the end face of the valve seat 520 facing the valve plate 530.

[0054] like Figure 6 As shown, based on the structural design of the one-way valve 500 including the valve plate 530, in one embodiment of this disclosure, the edge region 532 of the valve plate 530 may be provided with at least two flow holes 5301, such as, but not limited to, the eight flow holes 5301 shown in the figures, and these flow holes 5301 are arranged at intervals along the circumference of the valve plate 530. Further, when the edge region 532 of the valve plate 530 is provided with at least two flow holes 5301, these flow holes 5301 can be evenly spaced. Through the above structural design, this disclosure enables the medium flowing through the flow holes 5301 to be more uniform when the one-way valve 500 is in a normal flow state.

[0055] like Figure 6As shown, based on the structural design of the one-way valve 500 including the valve sheet 530, in an embodiment of the present disclosure, the orthographic projection of the flow-through hole 5301 can be circular. In some other embodiments of the present disclosure, the orthographic projection of the flow-through hole 5301 can also be elliptical or rectangular, and is not limited to the present embodiment.

[0056] Based on the structural design of the one-way valve 500 including the valve sheet 530, in an embodiment of the present disclosure, the valve sheet 530 can be made of metal, or the valve sheet 530 can also adopt a structure of a metal sheet film.

[0057] In an embodiment of the present disclosure, the one-way valve 500 proposed by the present disclosure can also include a limiting structure. The limiting structure is arranged in the valve cavity 5101, and the limiting structure can limit the movement of the valve sheet 530 in the axial direction away from the valve seat 520. Accordingly, the movement of the valve sheet 530 in the axial direction in the valve cavity 5101 is limited by the valve seat 520 and the limiting structure respectively, which is beneficial to improve the stability of the movement of the valve sheet 530.

[0058] As shown in Figure 4 and Figure 5 , based on the structural design of the one-way valve 500 including the limiting structure, in an embodiment of the present disclosure, the inner diameter of the valve pipe can be greater than the inner diameter of the outlet pipe 400, and accordingly, the connection between the inner wall of the valve pipe and the inner wall of the outlet pipe 400 can form a transition surface 401. Moreover, the width of the valve sheet 530 can be greater than the inner diameter of the outlet pipe 400 and less than or equal to the inner diameter of the valve pipe. The width of the valve sheet 530, when the valve sheet 530 is circular, can be understood as the diameter of the valve sheet 530, or when the valve sheet 530 is polygonal, can be understood as the length of the longest diagonal of the valve sheet 530. On this basis, when the medium in the valve pipe flows out of the barrel 100, the valve sheet 530 moves in the axial direction away from the valve seat 520 to the maximum distance and abuts against the transition surface 401. Through the above structural design, the present disclosure forms the transition surface 401 by using the variable diameter design of the valve pipe and the outlet pipe 400, which is used as the limiting structure for limiting the movement of the valve sheet 530, and the structure is simple, easy to implement, and can reduce the assembly steps.

[0059] As shown in Figure 8 and Figure 9 , Figure 8 and Figure 9 respectively represent the partial cross-sectional views of the oil separator capable of embodying the principles of the present disclosure in two different states in another exemplary embodiment, wherein, Figure 8 specifically shows the cross-sectional structure of the one-way valve 500 in the normal flow-through state, Figure 9 specifically shows the cross-sectional structure of the one-way valve 500 in the occlusion check state.

[0060] As shown in Figure 8 andFigure 9 As shown, in one embodiment of this disclosure, the limiting structure may include a stop 540. Specifically, the stop 540 is disposed in the valve cavity 5101, and the stop 540 includes a baffle 541, which is axially spaced from the valve seat 520. Based on this, when the medium in the valve pipe flows in the direction of exiting the cylinder 100, the valve plate 530 moves axially away from the valve seat 520 to its maximum distance and abuts against the baffle 541, thus serving as a limiting structure to restrict the movement of the valve plate 530.

[0061] like Figures 3 to 5 As 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 one-way 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 one-way 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 one-way valve 500, which helps to reduce the number of parts and lower the assembly difficulty.

[0062] Based on the structural design of the first part 410 of the exhaust pipe 400 as the valve pipe of the one-way valve 500, in one embodiment of this disclosure, when the inner diameter of the valve pipe is larger than the inner diameter of the exhaust 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 exhaust pipe 400 can adopt a reducing pipe structure.

[0063] like Figure 7 As shown, based on the structural design of the one-way 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 and fixing it. The process is simple and does not require a pre-positioning fixture.

[0064] like Figures 1 to 3 As shown, in one embodiment of this disclosure, an air outlet connector 430 is connected to the end of the air outlet pipe 400 extending out of the cylinder 100. Through this structural design, the oil separator can utilize the air outlet connector 430 to connect the air outlet pipe 400 to related components.

[0065] Based on the structural design that the gas outlet pipe 400 is connected with the gas outlet joint 430, in an embodiment of the present disclosure, taking the material of the gas outlet pipe 400 as stainless steel as an example, the material of the gas outlet joint 430 can be copper, for example, red copper or brass, etc. Through the above design, for the application scenarios of using copper for the material of the related components, for example, the material of the parts and pipelines of the refrigeration system is copper, the present disclosure can realize the effective connection between the gas outlet pipe 400 and the related components by using the gas outlet joint 430. In some other embodiments of the present disclosure, when the material of the related components is stainless steel, the present disclosure can also not be provided with the gas outlet joint 430, and then the end of the gas outlet pipe 400 extending out of the cylinder body 100 can be directly connected with the related components, and it is not limited to the above embodiment.

[0066] As shown in Figures 3 to 5 In an embodiment of the present disclosure, the oil separator provided by the present disclosure can further include an oil filter 600. The oil filter 600 is arranged on the side of the one-way valve 500 away from the gas outlet pipe 400, for example, the oil filter 600 is arranged on the side of the valve seat 520 away from the valve plate 530. Accordingly, after the refrigerant containing oil enters the oil separator, after the internal action of the oil separator, part of the lubricating oil is filtered, and the refrigerant with relatively low oil content passes through the oil filter 600, part of the lubricating oil is further filtered and then enters the one-way valve 500, so that the overall oil separation effect of the oil separator is improved.

[0067] As shown in Figures 3 to 5 Based on the structural design that the oil separator includes the oil filter 600, in an embodiment of the present disclosure, the oil filter 600 can be a mesh cover structure.

[0068] Based on the structural design that the oil separator includes the oil filter 600, in an embodiment of the present disclosure, the material of the oil filter 600 can be stainless steel. For example, the oil filter 600 in the mesh cover structure can be processed by using stainless steel mesh cloth.

[0069] It should be noted that the oil separator shown in the drawings and described in the specification is only a few examples of many kinds of oil separators that can use the principles of the present disclosure. It should be clearly understood that the principles of the present disclosure are by no means limited to any details or any components of the oil separator shown in the drawings or described in the specification.

[0070] In summary, the oil separator provided by the present disclosure comprises a cylinder 100, an air outlet pipe 400, and a one-way valve 500. The 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. The one-way valve 500 is arranged at the end of the air outlet pipe 400 inside the cylinder 100, so as to limit the medium of the air outlet pipe 400 to only flow out of the cylinder 100. The one-way valve 500 is a diaphragm type one-way valve. Through the above structure design, the oil separator provided by the present disclosure realizes the reverse check function on the air outlet path of the oil separator by using the diaphragm type one-way valve 500, avoids the medium such as gas in the external pipeline from flowing into the cylinder 100 through the air outlet pipe 400, avoids the reverse flow phenomenon, and improves the stability and reliability of the oil separator. Furthermore, the one-way valve 500 is arranged inside the cylinder 100, and the air outlet pipe 400 of the oil separator does not need to be connected with other one-way valves outside the cylinder 100, which reduces the number of external connection points of the oil separator, and at the same time, the part of the air outlet pipe 400 extending out of the cylinder 100 does not need to be reserved with a longer length, which is beneficial to save the pipeline and reduce the cost.

[0071] The exemplary embodiments of the oil separator provided by the present disclosure are described and / or illustrated above in detail. However, the embodiments of the present disclosure are not limited to the specific embodiments described herein, but rather the components and / or steps of each embodiment can be used independently and separately from other components and / or steps described herein. Each component and / or step of one embodiment can also be used in combination with other components and / or steps of other embodiments. The language used in the description herein has been principally selected for readability and instructional purposes and can not have been selected to delineate or circumscribe the patentable subject matter. It is therefore intended that references to "one embodiment" or "an embodiment" of the present disclosure should be interpreted as including all embodiments of the present disclosure, including exemplary embodiments of the present disclosure.

[0072] Although the oil separator provided by the present disclosure has been described in accordance with various specific embodiments, it will be recognized that modifications can be made to the embodiments of the present disclosure within the spirit and scope of the claims.

Claims

1. An oil separator characterized by, The oil separator comprises: a cylinder (100); an air inlet pipe (200) and an oil return pipe (300) connected to the cylinder (100) respectively; an air outlet pipe (400) connected to the cylinder (100), one end of the air outlet pipe (400) extending into the cylinder (100), and the other end extending out of the cylinder (100); a one-way valve (500) arranged at the end of the air outlet pipe (400) in the cylinder (100), for limiting the medium in the air outlet pipe (400) to flow out of the cylinder (100) only, the one-way valve (500) being a diaphragm type one-way valve (500).

2. The oil separator of claim 1, wherein The one-way valve (500) comprises: a valve pipe connected to the air outlet pipe (400) and having a valve cavity (5101); a valve seat (520) connected to the valve pipe and provided with a valve hole (5201) penetrating along the axial direction of the valve pipe, the valve hole (5201) being in communication with the valve cavity (5101); a valve disc (530) movably arranged in the valve cavity (5101), the valve disc (530) having a middle region (531) and an edge region (532), the valve hole (5201) being entirely located within the projection range of the valve disc (530) on a reference plane perpendicular to the axial direction, the edge region (532) being provided with a flow-through hole (5301) penetrating along the axial direction; wherein, when the flow direction of the medium in the valve pipe is the direction of flowing out of the cylinder (100), the valve disc (530) is arranged in spaced relation with the valve seat (520), so that the medium entering the valve cavity (5101) through the valve hole (5201) flows through the flow-through hole (5301) of the valve disc (530); when the flow direction of the medium in the valve pipe is the direction of flowing in from the outside, the valve disc (530) is in contact with the valve seat (520), the middle region (531) of the valve disc (530) blocks the valve hole (5201), so that the medium cannot flow between the valve cavity (5101) and the cylinder (100).

3. The oil separator according to claim 2, wherein: the edge region (532) of the valve disc (530) is provided with at least two flow-through holes (5301), and the at least two flow-through holes (5301) are arranged in spaced relation along the circumferential direction; and / or the projection of the flow-through hole (5301) is circular, elliptical or rectangular.

4. The oil separator of claim 2, wherein The one-way valve (500) further comprises: a limiting structure arranged in the valve cavity (5101), for limiting the movement of the valve disc (530) along the axial direction away from the valve seat (520).

5. The oil separator of claim 4, wherein The limiting structure comprises: a stop seat (540) arranged in the valve cavity (5101), the stop seat (540) comprising a stop plate (541) arranged in spaced relation with the valve seat (520) along the axial direction; wherein, when the flow direction of the medium in the valve pipe is the direction of flowing out of the cylinder (100), the valve disc (530) moves to the maximum distance away from the valve seat (520) and abuts against the stop plate (541).

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 joint between an inner wall of the valve pipe and an inner wall of the air outlet pipe (400); a width of the valve disc (530) is greater than the inner diameter of the air outlet pipe (400) and less than or equal to the inner diameter of the valve pipe; when a medium in the valve pipe flows out of the cylinder body (100), the valve disc (530) moves axially away from the valve seat (520) to abut against the transition surface (401) at a maximum distance.

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 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 one-way valve (500) away from the air outlet pipe (400).

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