JP2013174224A - Oil separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil separator supplying a separated oil content from being taken into passing air.SOLUTION: An oil separator 3 separates an oil content and recovers the same by making air containing the oil content introduced into the casing 11 collide with a collision plates 34, 35. The oil separator 3 is constituted of the collision plates 34, 35 and a space, and has expanding chambers 31, 32 having a lateral cross-section area than an introducing opening 14, a drain reservoir 50 for storing the separated oil content in the lower parts of the expanding chambers 31, 32, and a drain communication section 45 having a drain communication hole 46 bringing the expanding chambers 31, 32 into communication with the drain reservoir 50.

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 removes 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 plate type in which a plurality of collision plates with which air containing moisture and oil collides are provided in a casing (for example, see Patent Document 2). This collision plate type oil separator collects oil and discharges clean air by performing gas-liquid separation by colliding air with the collision plate.

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

  By the way, the oil separator stores the separated oil at the bottom of the expansion chamber. For this reason, there is a possibility that the oil accumulated when air passes through the expansion chamber may be taken into the air. Therefore, there has been a demand for an oil separator that suppresses the separated oil from being taken into the passing air.

  This invention is made | formed in view of such a situation, The objective is to provide the oil separator which suppressed that the isolate | separated oil component was taken in into passage air.

Hereinafter, means for achieving the above-described object and its operation and effects will be described.
The invention according to claim 1 is an oil separator that separates and collects oil by colliding air containing oil introduced into the housing with the collision plate, and includes the collision plate and a space. An expansion chamber having a large cross-sectional area, a drain reservoir for storing separated oil at a lower portion of the expansion chamber, and a drain communication portion having a communication hole for communicating the expansion chamber and the drain reservoir. Is the gist.

  According to this configuration, since the drain reservoir is provided in the lower part of the expansion chamber via the drain communication portion, the separated oil moves from the drain communication portion to the drain reservoir, and the drain accumulated in the drain reservoir is removed. It is possible to suppress the separated oil component from being taken into the passing air without being wound up in the expansion chamber. Here, the drain is a liquid containing oil and moisture.

  The gist of the invention according to claim 2 is that, in the oil separator according to claim 1, a plurality of the expansion chambers are provided, and a partition wall that partitions the expansion chamber and the expansion chamber is provided.

  According to this configuration, the oil contained in the air is removed by colliding with the collision plate, and is also eliminated by colliding with the partition walls that define the expansion chamber. By the way, in the structure in which the partition is not provided, the oil component is not so much separated in the preceding expansion chamber, and a large amount of oil component is separated in the subsequent expansion chamber. Therefore, since the partition wall is provided between the expansion chambers, the oil component is removed in each expansion chamber, and the oil component can be stored without unevenness.

According to a third aspect of the present invention, in the oil separator according to the second aspect, the communication hole is provided for each expansion chamber.
According to this configuration, since the communication hole is provided in each expansion chamber, the oil component separated in each expansion chamber can be stored in the drain reservoir from each communication hole. For this reason, the oil component separated in each expansion chamber can be collected in the drain reservoir without going through another expansion chamber.

  The gist of the invention according to claim 4 is the oil separator according to any one of claims 1 to 3, wherein the drain reservoir is provided with a detachable attachment / detachment mechanism.

  According to this configuration, the drain reservoir can be removed from the housing by the attaching / detaching mechanism, so that the drain reservoir can be cleaned. In particular, when oil adheres to the inner wall of the drain reservoir, the oil can be easily removed. Moreover, if the drain reservoir is made disposable, the maintainability can be improved.

  The gist of the invention according to claim 5 is that, in the oil separator according to any one of claims 1 to 4, the drain communication portion includes a removable attachment / detachment mechanism.

  According to this configuration, the drain communication part can be detached from the housing by the attaching / detaching mechanism, so that the drain communication part can be cleaned. In particular, when an oil component adheres in the communication hole of the drain communication portion, the oil component can be easily removed.

  According to the present invention, in the oil separator, it is possible to suppress the separated oil component from being taken into the passing air.

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. The longitudinal cross-sectional view which shows the state which the oil separator decomposed | disassembled. FIG. 4 is a cross-sectional view taken along line AA in FIG. 3 showing the internal structure of the oil separator. The BB sectional view of Drawing 3 showing the internal structure of an oil separator. The block diagram which shows the installation position of the oil separator in an air system | strain.

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 plate system in which a plurality of collision plates with which oil containing moisture collides are provided in the housing. The collision plate type oil separator 3 collects oil and discharges clean air by performing gas-liquid separation by colliding air containing oil and moisture with the collision plate.

  As shown in FIG. 2, the oil separator 3 is a rectangular parallelepiped casing 11 extending in the horizontal direction. An introduction port 14 and a discharge port 15 are formed on the front surface 12 and the back surface 13 of the casing 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 left side to the right side in FIG.

  An opening 16 is formed on the bottom surface of the housing 11. On the bottom surface of the housing 11, a drain reservoir 50 that stores drainage containing moisture and oil separated from air is attached by bolts 21 and nuts 22. The drain reservoir 50 has a box shape with an upper opening. In addition, the attachment mechanism comprises the attachment / detachment mechanism by the bolt 21 and the nut 22.

  In addition, a drain communication portion 45 in which a plurality of drain communication holes 46 that communicate the interior of the housing 11 and the drain reservoir 50 are formed is fitted into the opening 16 on the bottom surface of the housing 11. In addition, the fitting mechanism to the opening part 16 of the drain communication part 45 comprises the attachment / detachment mechanism. Further, a drain discharge port 17 for discharging drain is formed on the bottom surface 51 of the drain reservoir 50 on the side where the discharge port 15 is formed.

  An opening 18 is formed on the upper surface of the housing 11. The opening 18 is closed by a rectangular lid 19. A sealing sheet 20 that covers the entire surface of the opening 18 is sandwiched between the opening 18 and the lid 19. The lid 19, the sealing sheet 20, and the housing 11 are fastened and fixed by a plurality of bolts 21 and nuts 22. The lid 19 regulates the movement of the accommodated member.

  As shown in FIG. 3, a plate-like partition wall 30 is provided at the central portion in the longitudinal direction in the housing 11. The casing 11 is partitioned in a horizontal direction by a partition wall 30 into a primary expansion chamber 31 on the introduction port 14 side and a secondary expansion chamber 32 on the discharge port 15 side. The cross-sectional area of the primary expansion chamber 31 and the secondary expansion chamber 32 is formed larger than the cross-sectional area of the introduction port 14. For this reason, the introduced air expand | swells and a passage speed becomes slow. By slowing the air passage speed, the saturated water vapor pressure is lowered and oil and water are more likely to aggregate, and the mass of the particles is increased to easily collide with the collision plate.

  A through hole (orifice hole) 30 a is formed at one location in the upper part of the partition wall 30. Therefore, the partition wall 30 functions as an orifice by the orifice hole 30a. In addition, a through hole is formed at a lower portion in the vicinity of the opening 16 of the partition wall 30, and a communication hole 33 through which the drain separated and collected from the air passes between the expansion chambers 31 and 32 is provided.

  A pair of opposing collision plates 34 and 35 are provided on both sides of the partition wall 30 in the housing 11. The first collision plate 34 on the upstream side includes a first standing plate 34 a extending from the opening 16 of the housing 11 to the lid 19, and the first standing plate 34 a toward the discharge port 15 in the longitudinal direction of the housing 11. And a first baffle plate 34b extending vertically from the front. In the first standing plate 34a of the first collision plate 34, a rectangular first through hole 34c extending in the width direction of the collision plates 34, 35 is formed below the connection portion of the first baffle plate 34b. .

  The second collision plate 35 on the downstream side is provided with a second standing plate 35 a extending from the opening 16 of the housing 11 to the lid 19, and a second standing plate toward the introduction port 14 in the longitudinal direction of the housing 11. And a second baffle plate 35b extending vertically from the plate 35a. The second standing plate 35a of the second collision plate 35 has a rectangular second through-hole 35c extending in the width direction of the collision plates 34, 35 of the second baffle plate 35b than the connection portion of the second baffle plate 35b. It is formed above.

  And the 1st baffle plate 34b and the 2nd baffle plate 35b protrude so that a flow path may be disturbed, and the very narrow part 36 which is a narrow clearance gap is formed by making a mutual large surface adjoin. Here, the first baffle plate 34b is located closer to the lid 19 than the second baffle plate 35b. The extremely narrow portion 36 increases the air passage speed, and the formation of the meandering flow path increases the chance of collision of the oil / water particles with the plate, thereby separating the oil / water from the air. Further, the presence of the baffle plates 34b and 35b prevents the oil and water that has fallen from being rolled up by the passing air and carried to the downstream side, thereby suppressing a decrease in the amount of collected drainage. A through hole is formed at a lower portion in the vicinity of the opening 16 of the first collision plate 34 and the second collision plate 35, and a communication hole 33 through which the drain separated and collected from the air passes is provided.

  The primary expansion chamber 31 includes a pair of collision plates 34 and 35 and a space. In a space between the introduction port 14 and the pair of collision plates 34 and 35, a urethane foam (sponge or the like) 38 having a punching metal plate 37 having a plurality of holes attached on one side is installed. The urethane foam 38 captures oil moisture.

  The secondary expansion chamber 32 is also composed of a pair of collision plates 34 and 35 and a space. In a space between the pair of collision plates 34 and 35 and the discharge port 15, a crashed aluminum 39 sandwiched on both sides by a punching metal plate 37 having a plurality of holes is provided. The crashed aluminum 39 further captures oil moisture.

  Each expansion chamber 31, 32 is provided with a rib 40 that increases the strength of the housing 11. The drain reservoir 50 is provided with four ribs 52 for increasing the strength. Further, two drain communication holes 46 of the drain communication portion 45 are formed in each of the expansion chambers 31 and 32, and correspond to the urethane foam 38, the collision plates 34 and 35, and the crashed aluminum 39, respectively.

  As shown in FIG. 4, the drain communication portion 45 and the drain reservoir portion 50 can be attached to and detached from the housing 11. That is, the drain communication portion 45 is fitted into the opening 16 of the housing 11, and the drain reservoir 50 is attached to the bottom surface of the housing 11. For this reason, the drain accumulated in the drain communicating portion 45 and the drain reservoir 50 can be easily removed by removing the drain communicating portion 45 and the drain reservoir 50 from the housing 11.

As shown in FIG. 5, the drain reservoir 50 attached to the lower part of the housing 11 is hollow, and can collect the drain to the lower surface of the drain communication part 45.
As shown in FIG. 6, a columnar accommodating portion 23 that accommodates a heater 41 as a heating unit is formed on the bottom surface 51 side of the rib 52 of the drain reservoir 50. An insertion port 24 into which the heater 41 is inserted is formed on the outer surface of the drain reservoir 50 and penetrates from the insertion port 24 to the housing unit 23. The heater 41 has a columnar shape, and is installed by being inserted into the accommodating portion 23 from the outer surface of the drain reservoir 50. The heater 41 is connected to a power source.

  An attachment hole 25 for attaching the thermostat 42 is formed above the insertion port 24 on the outer surface of the drain reservoir 50. The thermostat 42 is attached to the attachment hole 25 and connected to the power source and the heater 41. The thermostat 42 detects the temperature of the drain reservoir 50 and controls the heating of the heater 41. By heating the drain reservoir 50 with the heater 41, the water contained in the drain accumulated on the bottom surface of the drain reservoir 50 is evaporated as much as possible to generate drain having a high oil content. Furthermore, by heating the casing 11 with the heater 41, it is possible to prevent the moisture from being frozen in a cold region so that the drain cannot be discharged from the drain discharge port 17.

Next, the operation of the oil separator configured as described above will be described.
The air introduced into the primary expansion chamber 31 from the introduction port 14 passes through the urethane foam 38 while oil and moisture are captured, and passes through the first through hole 34 c of the first collision plate 34 of the primary expansion chamber 31. At this time, the oil and water colliding with the first standing plate 34a other than the first through hole 34c is separated from the air. And the air which passed the 1st through-hole 34c passes toward the very narrow part 36 formed of the 1st baffle plate 34b and the 2nd baffle plate 35b. At this time, the oil and water colliding with the second upright plate 35a and the second baffle plate 35b are separated from the air.

  The drain containing water and oil captured by the urethane foam 38 drops into the drain reservoir 50 from the drain communication hole 46 located below the urethane foam 38 through the urethane foam 38, and enters the drain reservoir 50. Accumulate. Further, the drain that collides with and is separated from the first collision plate 34 of the primary expansion chamber 31 passes through the communication hole 33 of the first collision plate 34, and the drain communication hole 46 located below the collision plates 34 and 35. Falls into the drain reservoir 50 and accumulates in the drain reservoir 50.

  The air that has passed through the extremely narrow portion 36 passes through the second through hole 35 c of the second standing plate 35 a and 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 is separated from the second collision plate 35 of the primary expansion chamber 31 passes through the communication hole 33 of the second collision plate 35 and drains from the drain communication hole 46 located below the collision plates 34 and 35. It falls into the reservoir 50 and accumulates in the drain reservoir 50.

  The air that has passed through the orifice hole 30 a of the partition wall 30 passes through the first through hole 34 c of the first standing plate 34 a of the secondary expansion chamber 32. At this time, the oil and water colliding with the first standing plate 34a other than the first through hole 34c is separated from the air. And the air which passed the 1st through-hole 34c passes toward the very narrow part 36 formed of the 1st baffle plate 34b and the 2nd baffle plate 35b. At this time, the oil and water colliding with the second upright plate 35a and the second baffle plate 35b are separated from the air.

  The drain that collides and is separated from the partition wall 30 passes through the communication hole 33 of the partition wall 30 and the communication hole 33 of the first collision plate 34 of the secondary expansion chamber 32, and is located below the collision plates 34 and 35. The fluid falls from the communication hole 46 to the drain reservoir 50 and accumulates in the drain reservoir 50.

  The air that has passed through the extremely narrow portion 36 passes through the second through hole 35 c of the second standing plate 35 a and passes toward the crashed aluminum 39. At this time, the air introduced into the crashed aluminum 39 passes while oil and moisture are further captured by the crashed aluminum 39, and clean air that does not contain oil is discharged from the discharge port 15 to the outside.

  The drain that collides with and is separated from the first collision plate 34 of the secondary expansion chamber 32 passes through the communication hole 33 of the first collision plate 34 and passes through the drain communication hole 46 located below the collision plates 34 and 35. It falls into the drain reservoir 50 and accumulates in the drain reservoir 50. Further, the drain that collides with and is separated from the second collision plate 35 of the secondary expansion chamber 32 passes through the communication hole 33 of the second collision plate 35, and the drain communication hole located below the collision plates 34 and 35. The liquid drops from 46 to the drain reservoir 50 and accumulates in the drain reservoir 50. Further, the drain captured by the crashed aluminum 39 falls through the crashed aluminum 39 from the drain communication hole 46 located below the crashed aluminum 39 to the drain reservoir 50 and accumulates in the drain reservoir 50. .

  The drain accumulated in the drain reservoir 50 is heated by the heater 41 and the moisture in the drain is evaporated. Then, the drain having a high oil content is discharged from the drain discharge port 17. When removing the drain accumulated in the drain reservoir 50, the interior can be cleaned by removing the drain reservoir 50 from the housing 11.

As described above, according to the embodiment described above, the following effects can be obtained.
(1) Since the drain reservoir 50 is provided below the expansion chambers 31 and 32 via the drain communication portion 45, the separated oil and water moves from the drain communication portion 45 to the drain reservoir 50, and the drain reservoir 50. It is possible to prevent the separated oil and water from being taken into the passing air without winding up the drain accumulated in the expansion chambers 31 and 32.

  (2) Oil and moisture contained in the air collide with the collision plates 34 and 35 and are removed, and also collide with the partition walls 30 that define the expansion chambers 31 and 32 to be removed. By the way, in the configuration in which the partition wall 30 is not provided, the oil and moisture is not so much separated in the primary expansion chamber 31, and much oil and moisture is separated in the secondary expansion chamber 32. Therefore, since the partition wall 30 is provided between the primary expansion chamber 31 and the secondary expansion chamber 32, the oil and water can be removed in each of the expansion chambers 31 and 32, and the oil and water can be stored without unevenness.

  (3) Since the drain communication holes 46 are provided in the expansion chambers 31 and 32, the oil and water separated in the expansion chambers 31 and 32 can be stored in the drain reservoir 50 from the drain communication holes 46. For this reason, the oil and water separated in each of the expansion chambers 31 and 32 can be collected in the drain reservoir 50 without passing through another expansion chamber.

  (4) Since the drain reservoir 50 can be detached from the housing 11 by the attaching / detaching mechanism using the bolt 21 and the nut 22, the drain reservoir 50 can be cleaned. In particular, when oil adheres to the inner wall of the drain reservoir 50, the oil can be easily removed. Further, if the drain reservoir 50 parts is made disposable, the maintainability can be improved.

  (5) Since the drain communication part 45 can be removed from the housing 11 by the attaching / detaching mechanism by fitting, the drain communication part 45 can be cleaned. In particular, when an oil component adheres into the drain communication hole 46 of the drain communication portion 45, the oil component can be easily removed.

In addition, the said embodiment can be implemented with the following forms which changed this suitably.
In the above embodiment, the sealing sheet 20 is provided between the opening 18 and the lid 19 of the housing 11, but the sealing sheet 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-described embodiment, the baffle plates 34b and 35b extending perpendicularly to the standing plates 34a and 35a are provided. However, if the extremely narrow portion 36 can be maintained, the baffle plates 34b and 35b are provided as the standing plates 34a and 35a. It is not necessary to form perpendicularly to.

In the above embodiment, the extremely narrow portion 36 including the pair of baffle plates 34b and 35b is provided. However, an extremely narrow portion including a plurality of baffle plates that are paired with each other may be provided.
In the above embodiment, the communication hole 33 is formed in the lower part of the partition wall 30, but when the drain discharge port 17 is formed in each of the expansion chambers 31, 32, the communication hole 33 of the partition wall 30 may be omitted.

  In the above embodiment, the movement of the collision plates 34, 35, the partition wall 30, the urethane foam 38, the crashed aluminum 39, etc. is restricted by the lid 19. However, if the collision plates 34 and 35, the partition wall 30, the urethane foam 38, the crashed aluminum 39, and the like are fixed, the movement restriction by the lid 19 may be eliminated.

In the above embodiment, the crashed aluminum 39 is installed in the primary expansion chamber 31, but urethane foam 38 may be installed in place of the crashed aluminum 39.
In the above embodiment, the urethane foam 38, the collision plates 34 and 35, the partition wall 30 (orifice hole 30a), the collision plates 34 and 35, and the crashed aluminum 39 are arranged in this order. However, depending on the amount of oil and moisture discharged from the air dryer 2 (compressor 1), these arrangements may be changed, some members may be omitted, some members may be increased, or the members may be changed. .

  In the above configuration, when the drain communication hole 46 is provided in a portion where the urethane foam 38 or the crashed aluminum 39 is in contact with the drain communication portion 45, the drain is promoted to fall and the winding of the drain to the expansion chambers 31 and 32 is suppressed. be able to.

In the above embodiment, the expansion chambers 31 and 32 are provided in the horizontal direction, but may be provided in the vertical direction.
In the above embodiment, the introduction port 14 is formed on the front surface 12 and the discharge port 15 is formed on the back surface. An outlet 15 may be formed.

In the above embodiment, the heater 41 is installed on the rib 52, but the heater 41 may be installed at a place other than the rib 52.
In the above configuration, the number of heaters 41 can be changed as necessary.

  In the above embodiment, the primary expansion chamber 31 and the secondary expansion chamber 32 have substantially the same size, but the volume of the secondary expansion chamber 32 may be larger than the volume of the primary expansion chamber 31. In this way, the saturated water vapor pressure is further reduced and oil and water are likely to aggregate, and the mass of the particles is increased to easily collide with the collision plate. Therefore, more oil and water separated from the air can be stored in the secondary expansion chamber 32 than in the primary expansion chamber 31.

  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, as shown in FIG. 7, 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, oil moisture will be separated from the air containing the lubricating oil etc. of compressor 1, and clean air can be supplied to air dryer 2. Therefore, deterioration due to oil in the desiccant provided in the air dryer 2 can be suppressed.

  In the above embodiment, the oil separator 3 is provided in the air system in which the air dryer 2 is provided in vehicles such as trucks, buses, and construction machines. However, the oil separator 3 is used anywhere as long as it is used for separating oil from air containing oil and moisture. Can do. For example, the exhaust from the air dryer that dries the compressed air to the atmosphere in a factory or the like may be cleaned by an oil separator.

  DESCRIPTION OF SYMBOLS 1 ... Compressor, 2 ... Air dryer, 3 ... Oil separator, 11 ... Housing, 12 ... Front, 13 ... Back, 14 ... Inlet, 15 ... Discharge port, 16 ... Opening part, 17 ... Drain discharge port, 18 ... Opening Part, 19 ... lid, 20 ... sealing sheet, 21 ... bolt, 22 ... nut, 23 ... accommodating part, 24 ... insertion port, 25 ... mounting hole, 26 ... inner wall, 30 ... partition wall, 30a ... orifice hole, 31 ... primary Expansion chamber 32 ... Secondary expansion chamber 33 ... Communication hole 34 ... First collision plate 34a ... First standing plate 34b ... First baffle plate 34c ... First through hole 35 ... Second collision plate 35a ... second standing plate, 35b ... second baffle plate, 35c ... second through hole, 36 ... extremely narrow part, 37 ... punching metal plate, 38 ... urethane foam, 39 ... crashed aluminum, 40 ... rib, 41 ... heater, 42 ... thermostat, 45 ... do Emissions communicating portion, 46 ... drain hole, 50 ... drain reservoir, 51 ... bottom, 52 ... rib.

Claims (5)

In an oil separator that separates and collects oil by colliding air containing oil introduced into the housing with the collision plate,
An expansion chamber composed of the collision plate and the space, and having a larger cross-sectional area than the inlet,
A drain reservoir for storing separated oil in the lower part of the expansion chamber;
An oil separator, comprising: a drain communication portion having a communication hole for communicating the expansion chamber and the drain reservoir portion. In the oil separator according to claim 1,
A plurality of the expansion chambers;
An oil separator, characterized in that a partition wall that partitions the expansion chamber and the expansion chamber is provided. The oil separator according to claim 2, wherein the communication hole is provided for each expansion chamber. In the oil separator according to any one of claims 1 to 3,
The drain reservoir includes an detachable attachment / detachment mechanism. In the oil separator according to any one of claims 1 to 4,
The drain communication portion includes an detachable attachment / detachment mechanism.

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