JP5996927B2 - Oil separator - Google Patents

Description

  The present invention relates to an oil separator that separates oil contained in air that has passed through an apparatus.

  Vehicles such as trucks, buses and construction machinery control systems such as brakes and suspensions using compressed air sent from a compressor directly connected to the engine. This compressed air contains moisture contained in the atmosphere and oil that lubricates the inside of the compressor. When this compressed air containing moisture and oil enters each system, rust and swelling of a rubber member (O-ring or the like) are caused, causing a malfunction. For this reason, the air dryer for removing the water | moisture content and oil content in compressed air is provided downstream of the compressor of an air system (for example, refer patent document 1).

  In the air dryer, a desiccant such as a filter, silica gel or zeolite is provided. And an air dryer performs the dehumidification effect | action which removes a water | moisture content, and the reproduction | regeneration effect | action which remove | eliminates the water | moisture content adsorbed by the desiccant and discharge | releases outside.

  By the way, since the oil released from the air dryer during regeneration of the desiccant contains oil as well as moisture, it is considered to provide an oil separator downstream of the compressor of the air system in consideration of environmental load.

  As an oil separator, there is a collision type in which a plurality of collision materials with which air containing moisture and oil collides are provided in a casing (for example, see Patent Document 2). This collision-type oil separator collects oil and discharges clean air by performing air-liquid separation by colliding air with a collision material.

Japanese Patent Laid-Open No. 10-296038 JP 2008-2377 A

  By the way, since the oil separator is used for the cylinder head, the oil separated from the bottom of the oil separator is returned to the cylinder head. However, since the inventors consider providing an oil separator downstream of the compressor of the air system, the oil component separated from the air is stored inside the casing of the oil separator. Since this oil separator is mounted on the vehicle, the accumulated oil may flow into the introduction port depending on a change in the running acceleration of the vehicle or the inclination of the vehicle. Therefore, there has been a demand for an oil separator that suppresses oil from flowing into the inlet.

  This invention is made | formed in view of such a situation, The objective is to provide the oil separator by which oil content was suppressed from flowing into an inlet.

Hereinafter, means for achieving the above-described object and its operation and effects will be described.
According to the first aspect of the present invention, in the oil separator that separates and collects the oil component by colliding the air containing the oil component introduced into the casing with the collision material, the inlet for introducing the air into the casing is the casing. Opening in the horizontal direction of the body, the introduction port is formed, an introduction part smaller than the cross-sectional area of the flow path of the housing, and formed in the introduction part to restrict the backflow of separated oil to the introduction port A restricting member, and the restricting member is a restricting plate that is erected from the bottom surface in the introduction portion and is positioned in front of the introduction port, and is between the restricting plate and the inner wall of the housing. The gist is that a gap is provided .

According to this configuration, the regulating member is formed in the introduction part. For this reason, since the flow of the oil component from the inside of the housing to the introduction port side is restricted by the regulating member, the oil component can be prevented from flowing into the introduction port. Moreover, the restriction plate located in front of the introduction port was erected from the bottom surface in the introduction part. For this reason, since the flow of the oil component from the inside of the housing to the introduction port side is restricted by the restriction plate, the oil component can be prevented from flowing into the introduction port. In addition, since the restriction plate is positioned in front of the introduction port, it is necessary to go around the restriction plate in order to flow into the introduction port, and it is possible to suppress the flow into the introduction port easily. In addition, since the restriction plate is positioned in front of the introduction port, it is possible to suppress the oil that has jumped up in the housing from entering the introduction port by hitting the restriction plate.

According to a second aspect of the invention, the oil separator according to claim 2, wherein the regulating plate is in its gist to be formed so as to cover the lower portion of the flow path of the inlet portion.
According to this configuration, since the restriction plate covers the lower part of the flow path of the introduction part, even if the casing is inclined, the flow of oil to the introduction port is restricted by the restriction plate, so the oil content to the introduction port is restricted. Inflow can be further suppressed.

The invention according to claim 3 is the oil separator according to claim 1 or 2 , wherein an expansion chamber through which air passes, a reservoir for storing oil separated in the expansion chamber, the expansion chamber and the reservoir, and a communication plate provided between the communication plate is formed lower than the bottom surface within the inlet portion, the regulating member may include a stepped portion of the bottom surface in the inlet section and the communication plate Is the gist.

  According to this configuration, the step portion is formed between the bottom surface in the introduction portion and the communication plate. For this reason, even if the housing is tilted due to the inclination of the vehicle, even if oil flows from the inside of the housing to the introduction portion side, the oil flow into the introduction port is regulated by the stepped portion. Oil flow can be suppressed.

Invention of Claim 4 is an oil separator as described in any one of Claims 1-3. The expansion chamber which lets air pass through, The reservoir part which stores the oil component isolate | separated in the said expansion chamber, The said expansion chamber And a baffle plate that is provided on the lower surface of the communication plate and restricts the flow of the oil accumulated in the reservoir.

According to this configuration, since the baffle plate is provided, even if the oil component moves due to a change in the travel acceleration of the vehicle, the movement of the oil component is restricted, and the oil component can be prevented from jumping up.
Invention of Claim 5 is the oil separator as described in any one of Claims 1-4 . WHEREIN: When the air is introduce | transduced from the said inlet, the said restriction | limiting board expands a flow-path cross-sectional area, The gist of the invention is to provide a backflow suppression mechanism that restores the cross-sectional area of the flow path when the introduction of air from the introduction port stops.

  According to this configuration, the reverse flow suppression mechanism is provided in which the flow path cross-sectional area is expanded only when air is introduced from the inlet. For this reason, even if the oil component flows from the inside of the housing to the introduction port side, the flow path to the introduction port is almost blocked, so that the oil component can be prevented from flowing from the inside of the housing to the introduction port.

  ADVANTAGE OF THE INVENTION According to this invention, in an oil separator, it can suppress that an oil component flows into an inlet.

The block diagram which shows the installation position of the oil separator in an air system | strain. The side view which shows the external structure of an oil separator. The longitudinal cross-sectional view which shows the internal structure of an oil separator. 4-4 sectional drawing of FIG. 3 which shows the internal structure of an oil separator. 5-5 sectional drawing of FIG. 3 which shows the internal structure of an oil separator. 6-6 sectional drawing of FIG. 3 which shows the internal structure of an oil separator. The cross-sectional view which shows the internal structure of an oil separator. The longitudinal cross-sectional view which shows the internal structure of the inlet opening vicinity of an oil separator.

Hereinafter, an embodiment in which the oil separator of the present invention is embodied in an exhaust system of an air dryer will be described with reference to FIGS.
As shown in FIG. 1, vehicles such as trucks, buses, and construction machinery control systems such as brakes and suspensions using compressed air sent from a compressor 1. For this reason, an air dryer 2 is provided downstream of the compressor 1 of the air system for removing oil and water from the compressed air and providing dry air. A desiccant is provided in the air dryer 2. The air dryer 2 performs a dehumidifying action for removing oil and moisture and a regenerating action for removing oil and moisture adsorbed on the desiccant and releasing them to the outside.

  Therefore, in this embodiment, the air (purge air) released from the air dryer 2 at the time of regeneration of the desiccant contains oil as well as moisture, so the oil separator 3 is installed downstream of the compressor 1 of the air system in consideration of environmental load. Provide. In particular, the oil separator 3 is provided in the exhaust system of the air dryer 2 and separates and recovers oil and moisture from purge air discharged when the air dryer 2 is regenerated.

  The oil separator 3 is a collision system in which a plurality of collision materials that collide with air containing oil and moisture are provided in a casing. The collision-type oil separator 3 collects oil and discharges clean air by performing gas-liquid separation by colliding air containing oil and water with the collision material. The separated oil and water will be referred to as drain hereinafter.

  As shown in FIG. 2, the oil separator 3 includes a rectangular parallelepiped casing 11 that extends in the horizontal direction. An introduction port 14 and a discharge port 16 are formed on the front surface 12 and the back surface 13 of the housing 11 which are opposed to each other in the longitudinal direction. That is, the oil separator 3 is configured such that air passes from the right side to the left side in FIG.

  As shown in FIG. 3, the bottom surface 40 of the housing 11 is provided with a plurality of support members (support columns 41, step portions 42) that support the plate-shaped drain communication plate 43. As shown in FIG. 4, three support members are provided on the inner wall on the introduction port 14 side in the housing 11 side by side in the width direction. A support column 41 is provided at the center in the width direction, and stepped portions 42 are provided on both inner side walls. In addition, two support members are provided on the inner wall of the housing 11 on the side of the discharge port 16 side by side in the width direction. Step portions 42 are provided on both inner side walls. As shown in FIG. 5, three support members are provided side by side in the width direction at the center of the inlet 14 and the outlet 16 of the housing 11. A support column 41 is provided at the center in the width direction, and stepped portions 42 are provided on both inner side walls. As shown in FIG. 6, two support columns 41 are provided side by side in the width direction between the center of the inlet 14 and the outlet 16 of the housing 11 and the outlet 16. Further, three support columns 41 are arranged in the width direction between the center of the inlet 14 and the outlet 16 of the housing 11 and the inlet 14. 4 to 6, the urethane foam 33 is omitted from the illustration.

  As shown in FIG. 3, the drain communication plate 43 is constructed in the housing 11 by a plurality of support columns 41 and a plurality of step portions 42. The upper part of the drain communication plate 43 in the housing 11 functions as an expansion chamber through which air introduced from the introduction port 14 passes. On the other hand, the lower part of the drain communication plate 43 in the housing 11 functions as a drain reservoir 45 that accumulates oil and moisture (drain) separated from air in the expansion chamber. The drain reservoir 45 can accumulate drain to the lower surface of the drain communication plate 43.

  A plate-like partition wall 30 having an orifice hole 30 a is attached to the center of the inlet port 14 and the outlet port 16 on the upper surface of the drain communication plate 43. One orifice hole 30 a is formed in the upper part of the partition wall 30. The partition wall 30 functions as an orifice by the orifice hole 30a. The upper portion of the drain communication plate 43 in the housing 11 is partitioned by the partition wall 30 in the horizontal direction into the primary expansion chamber 31 on the inlet 14 side and the secondary expansion chamber 32 on the discharge port 16 side. Yes. The volume of the secondary expansion chamber 32 is larger than the volume of the primary expansion chamber 31. For this reason, the saturated water vapor pressure is further reduced in the secondary expansion chamber 32 as compared with the primary expansion chamber 31, and oil and water are more likely to aggregate, and the mass of the particles is increased to easily collide with the collision material. In the primary expansion chamber 31 and the secondary expansion chamber 32, urethane foam (sponge etc.) 33 is respectively installed. The air introduced from the introduction port 14 collides with the urethane foam 33 to separate oil and water from the air. That is, the urethane foam 33 captures oil moisture contained in the air. The urethane foam 33 corresponds to the collision material.

  The drain communication plate 43 is formed with a plurality of drain communication holes 44 for allowing the oil and water separated in the primary expansion chamber 31 and the secondary expansion chamber 32 to pass through the drain reservoir 45. At least one drain communication hole 44 is formed for each of the expansion chambers 31 and 32. The oil and moisture separated from the air by colliding with the urethane foam 33 flows on the upper surface of the drain communication plate 43 and falls from one of the drain communication holes 44 to the drain reservoir 45.

  Two baffle plates 46 for restricting the flow of drain accumulated in the drain reservoir 45 are attached to the lower surface of the drain communication plate 43. The baffle plate 46 is formed extending in the width direction. The baffle plate 46 restricts the movement of the drain accumulated in the drain reservoir 45 due to a change in the acceleration of the vehicle, and suppresses the splash of the drain.

  An opening 18 is formed on the upper surface of the housing 11. The opening 18 is closed by a rectangular lid 19. An O-ring 20 is installed on the upper surface of the opening 18 over the entire circumference of the opening 18, and the O-ring 20 is sandwiched between the opening 18 and the lid 19. The lid 19 and the housing 11 are fastened and fixed by a plurality of bolts 21 and nuts 22. The lid 19 restricts the movement of the accommodated urethane foam 33 and the like.

  A housing portion 23 for housing a heater 26 as a heating unit is provided on the bottom surface 40 on the discharge port 16 side in the housing 11. In the housing portion 23, an insertion portion 24 that opens to the back surface 13 of the housing 11 and into which the heater 26 is inserted is formed. The heater 26 has a cylindrical shape, and is installed by being inserted into the housing portion 23 from the back surface 13 of the housing 11. The heater 26 is connected to a power source.

  A mounting hole 25 for attaching a thermostat 27 is formed above the insertion portion 24 on the back surface 13 of the housing 11. The thermostat 27 is attached to the attachment hole 25 and connected to the power source and the heater 26. The thermostat 27 detects the temperature of the drain reservoir 45 and controls the heating of the heater 26. By heating the drain reservoir 45 with the heater 26, moisture contained in the drain accumulated on the bottom surface 40 of the drain reservoir 45 is evaporated as much as possible to generate drain having a high oil content.

  An introduction portion 15 having a channel cross-sectional area smaller than the channel cross-sectional area of the housing 11 is formed in the upper part of the front surface 12 of the housing 11. The introduction port 14 is formed in the introduction portion 15. A cylindrical attachment member 51 is fixed to the tip of the introduction port 14. The tip of the hose 50 connected to the air dryer 2 is connected to the tip of the attachment member 51.

An L-shaped elbow member 60 protruding from the discharge port 16 in the horizontal direction and bent upward is attached to the discharge port 16. The elbow member 60 is screwed to the discharge port 16.
As shown in FIG. 4, a regulation plate 53 that regulates the backflow of drain from the inside of the housing 11 to the introduction port 14 is provided on the front surface of the introduction portion 15. The restriction plate 53 is erected on the bottom surface 52 in the introduction portion 15. The bottom surface 52 in the introduction portion 15 is located above the top surface of the drain communication plate 43. Therefore, a step portion 54 that is a step with respect to the drain communication plate 43 is provided at the inner end portion of the introduction portion 15. The backflow of the drain can be restricted by the height of the stepped portion 54. In addition, it is possible to restrict the drain that has jumped up due to a change in the acceleration or vibration of the vehicle directly into the introduction port 14 by the restriction plate 53. That is, the restricting plate 53 and the stepped portion 54 function as a restricting member that restricts the drain accumulated in the drain reservoir 45 from flowing back to the introduction port 14.

Next, the operation of the oil separator configured as described above will be described.
The purge air discharged from the air dryer 2 is introduced into the oil separator 3. The purge air is air containing oil and water.

  The air introduced from the inlet 14 into the primary expansion chamber 31 passes through the urethane foam 33 while oil and moisture are captured. At this time, the oil and water colliding with the urethane foam 33 is separated from the air. The drain containing water and oil captured by the urethane foam 33 reaches the upper surface of the drain communication plate 43 through the urethane foam 33, and enters the drain reservoir 45 from the drain communication hole 44 formed in the drain communication plate 43. It falls and accumulates in the drain reservoir 45.

  The air that has passed through the urethane foam 33 of the primary expansion chamber 31 passes toward the orifice hole 30 a of the partition wall 30. At this time, the oil and water colliding with the partition wall 30 other than the orifice hole 30a is separated from the air. The drain that collides with and separated from the partition wall 30 reaches the upper surface of the drain communication plate 43 through the partition wall 30, falls from the drain communication hole 44 formed in the drain communication plate 43 to the drain storage portion 45, and is stored in the drain reservoir. It collects in the part 45.

  The air that has passed through the orifice hole 30 a of the partition wall 30 passes through the urethane foam 33 in the secondary expansion chamber 32 while oil and moisture are captured. At this time, the oil and water colliding with the urethane foam 33 is separated from the air. The drain containing water and oil captured by the urethane foam 33 reaches the upper surface of the drain communication plate 43 through the urethane foam 33, and enters the drain reservoir 45 from the drain communication hole 44 formed in the drain communication plate 43. It falls and accumulates in the drain reservoir 45.

The air that has passed through the urethane foam 33 in the secondary expansion chamber 32 is discharged to the outside from the discharge port 16 as clean air that does not contain oil.
The drain accumulated in the drain reservoir 45 is heated by the heater 26 and the moisture in the drain is evaporated. A drain having a high oil concentration can be discharged from the drain discharge port 17.

  The oil separator 3 is tilted in the same manner as the vehicle is tilted, as well as the vibration during vehicle travel. For this reason, the drain accumulated in the drain reservoir 45 is affected by the behavior of the vehicle. In the oil separator 3 according to the present embodiment, the restriction plate 53 is provided in the introduction portion 15 and the step portion 54 is provided. Therefore, the drain is changed from the inside of the housing 11 to the introduction port 14 side due to a change in vehicle running acceleration or the inclination of the vehicle. The flow of the drain is restricted by the step portion 54 and the restriction plate 53. In addition, since the baffle plate 46 is provided, the movement of the drain is restricted even if the drain tries to move in the longitudinal direction of the housing 11 due to the change in the running acceleration of the vehicle. Therefore, the movement of the drain is suppressed, the change of the drain liquid level is reduced, the flow of the drain from the inside of the casing 11 to the inlet 14 is suppressed, and the drain collides with the inner wall of the casing 11. Bounce can be suppressed. The restriction plate 53 is formed only on the front face of the inlet 14 and the side portion is open, so that the amount of air introduced is secured while restricting the flow of drain into the inlet.

As described above, according to the embodiment described above, the following effects can be obtained.
(1) The restriction plate 53 is formed in the introduction portion 15. For this reason, since the flow of the drain containing the oil component from the inside of the housing 11 to the introduction port 14 side is restricted by the restriction plate 53, the flow of the drain into the introduction port 14 can be suppressed.

  (2) The restriction plate 53 positioned in front of the introduction port 14 is erected from the bottom surface 52 in the introduction portion 15. For this reason, since the flow of the drain containing the oil component from the inside of the housing 11 to the introduction port 14 side is restricted by the restriction plate 53, the flow of the drain into the introduction port 14 can be suppressed. Further, since the restriction plate 53 is located in front of the introduction port 14, the drain must flow around the restriction plate 53 in order to flow into the introduction port 14, and can be prevented from easily flowing into the introduction port 14. In addition, since the restriction plate 53 is located in front of the introduction port 14, it is possible to suppress the drained up splash in the housing 11 from entering the introduction port 14 by hitting the restriction plate 53.

  (3) A step portion 54 is formed between the bottom surface 52 in the introduction portion 15 and the drain communication plate 43. For this reason, even if the casing 11 is inclined due to the inclination of the vehicle, even if drain containing oil from the casing 11 to the introduction portion 15 side flows, the step portion 54 causes the drain to flow into the introduction port 14. Since it is regulated, the flow of drain into the inlet 14 can be suppressed.

  (4) Since the baffle plate 46 is provided, the movement of the drain is restricted even if the drain containing the oil is about to move due to the change in the running acceleration of the vehicle, and the splash of the drain can be suppressed.

In addition, the said embodiment can be implemented with the following forms which changed this suitably.
In the above configuration, it is preferable that a minute through hole that guides the drain accumulated between the inlet 14 and the restriction plate 53 to the primary expansion chamber 31 is provided at the lowermost part of the restriction plate 53.

  In the above embodiment, the restriction plate 53 is formed only on the front surface of the introduction port 14 and the front side is opened, but a restriction plate formed not only on the front surface of the introduction port 14 but also on the front side is adopted. May be. For example, as shown in FIG. 7, a restriction plate 55 is erected on the bottom surface 52 in the introduction portion 15. The restriction plate 55 is located in front of the introduction port 14, and includes side portions 55 a and 55 b that extend laterally to the inner wall of the housing 11. The height of the side portions 55 a and 55 b of the regulation plate 55 is about half of the length from the bottom surface 52 to the lid 19 in the introduction portion 15. That is, the side parts 55 a and 55 b cover the lower part of the flow path of the introduction part 15. If it does in this way, the regulating plate 55 can regulate | regulate the drain which flows into the inlet 14 from the inside of the housing | casing 11 reliably.

  In the above embodiment, the restriction plates 53 and 55 are integrally provided on the bottom surface 52 in the introduction portion 15, but when air is introduced from the introduction port 14, the flow passage cross-sectional area is enlarged, and When the introduction of is stopped, a backflow suppressing mechanism for returning the cross-sectional area of the flow path to the original may be provided. For example, as shown in FIG. 8, a restricting plate 56 having side portions formed similarly to FIG. 7 is provided, and a one-way urging mechanism is provided as a backflow suppressing mechanism between the restricting plate 56 and the bottom surface 52 in the inlet 14. 57 is provided. The one-way urging mechanism 57 is set so as to urge the restricting plate 56 toward the introduction port 14 and to stand vertically. Then, when air is introduced from the introduction port 14, the regulation plate 56 tilts toward the discharge port 16 and enlarges the flow path cross-sectional area. Therefore, the flow of drain from the housing 11 to the introduction port 14 can be suppressed while securing the flow path.

In the above-described embodiment, the step portion 54 having a different height between the upper surface of the drain communication plate 43 and the bottom surface 52 in the introduction portion 15 is provided, but the step portion 54 may be omitted.
In the above embodiment, the O-ring 20 is provided between the opening 18 and the lid 19 of the housing 11, but the O-ring 20 may be omitted. In addition, it is desirable that a hermetic seal is maintained between the opening 18 of the housing 11 and the lid 19.

  In the above embodiment, the movement of the urethane foam 33 is regulated by the lid 19. However, if the urethane foam 33 is fixed, the movement restriction by the lid 19 may be eliminated.

  In the above embodiment, the urethane foam 33 is installed in the primary expansion chamber 31 and the secondary expansion chamber 32. However, the urethane foam 33 may be changed or partially changed depending on the amount of oil and water discharged from the air dryer 2 (compressor 1). May be omitted.

  In the above embodiment, the drain reservoir 45 is heated by the heater 26, but the drain itself stored in the drain reservoir 45 may be directly heated. In this case, it is desirable to install the thermostat 27 on the inner wall of the housing 11 in order to perform accurate temperature control. In this way, heat transfer from the heater 26 to the drain is high, and the drain can be heated more efficiently than indirectly heating the drain.

In the above configuration, the number of heaters 26 can be changed as necessary.
In the above embodiment, the oil separator 3 is provided in the exhaust system of the air dryer 2 that is downstream of the compressor 1 of the air system. However, the oil separator 3 may be provided downstream of the air system compressor 1 and upstream of the air dryer 2. If it does in this way, an oil component can be isolate | separated from the air containing the lubricating oil etc. of the compressor 1, and clean air can be supplied to the air dryer 2. FIG. Therefore, deterioration due to oil in the desiccant provided in the air dryer 2 can be suppressed.

  DESCRIPTION OF SYMBOLS 1 ... Compressor, 2 ... Air dryer, 3 ... Oil separator, 11 ... Housing | casing, 12 ... Front, 13 ... Back surface, 14 ... Introduction port, 15 ... Introduction part, 16 ... Discharge port, 17 ... Drain discharge port, 18 ... Opening Part, 19 ... lid, 20 ... O-ring, 21 ... bolt, 22 ... nut, 23 ... housing part, 24 ... insertion part, 25 ... mounting hole, 26 ... heater, 27 ... thermostat, 30 ... partition wall, 30a ... orifice hole 31 ... Primary expansion chamber, 32 ... Secondary expansion chamber, 33 ... Urethane foam, 40 ... Bottom, 41 ... Supporting column, 42 ... Stepped portion, 43 ... Drain communication plate, 44 ... Drain communication hole, 45 ... Drain reservoir 46 ... Baffle plate, 50 ... Hose, 51 ... Mounting member, 52 ... Bottom surface, 53 ... Regulatory plate, 54 ... Stepped portion, 60 ... Elbow member.

Claims (5)

In an oil separator that separates and recovers oil by colliding air containing oil introduced into the housing with the impact material,
An inlet for introducing air into the housing opens in the horizontal direction of the housing,
The introduction port is formed, and the introduction portion is smaller than the flow path cross-sectional area of the housing;
A regulation member that is formed in the introduction part and regulates the backflow of the separated oil to the introduction port , and
The restricting member is a restricting plate that is erected from the bottom surface in the introduction part and is positioned in front of the introduction port,
An oil separator , wherein a gap is provided between the regulating plate and the inner wall of the housing . In the oil separator according to claim 1,
The restriction plate is formed in a state of covering a lower portion of the flow path of the introduction portion. In the oil separator according to claim 1 or 2 ,
An expansion chamber through which air passes;
A reservoir for storing oil separated in the expansion chamber;
A communication plate provided between the expansion chamber and the reservoir,
The communication plate is formed lower than the bottom surface in the introduction part,
The regulating member, an oil separator, characterized in that it comprises a step portion of the bottom surface in the inlet section and the communication plate. In the oil separator according to any one of claims 1 to 3 ,
An expansion chamber through which air passes;
A reservoir for storing oil separated in the expansion chamber;
A communication plate provided between the expansion chamber and the reservoir;
An oil separator, comprising: a baffle plate installed on a lower surface of the communication plate and restricting a flow of oil accumulated in the reservoir portion. In the oil separator according to any one of claims 1 to 4 ,
The restriction plate includes a backflow suppression mechanism that expands a flow passage cross-sectional area when air is introduced from the introduction port and returns the flow passage cross-sectional area to the original state when introduction of air from the introduction port stops. Oil separator.

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