JP7410227B2 - oil separator - Google Patents

Description

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

Vehicles such as trucks, buses, and construction equipment use compressed air sent from a compressor directly connected to the engine to control systems such as brakes and suspensions. This compressed air contains moisture contained in the atmosphere and oil that lubricates the inside of the compressor. If this compressed air containing moisture and oil enters each system, it will cause rust and swelling of rubber members (O-rings, etc.), resulting in malfunction. For this reason, an air dryer is provided downstream of the compressor to remove moisture and oil from the compressed air.

The air dryer is equipped with a desiccant that removes moisture and a filter that captures oil. This air dryer has a dehumidifying function of removing moisture from the compressed air sent from the compressor, and a regenerating function of discharging the moisture adsorbed by the desiccant to the outside.

Since the air discharged from the air dryer when regenerating the desiccant contains oil as well as moisture, an oil separator is sometimes provided at the drain outlet of the air dryer in consideration of the environmental burden (for example, see Patent Document 1). . This oil separator includes a collision material in the housing against which air containing moisture and oil collides, and the moisture and oil contained in the air are separated by colliding the air with the collision material. The separated oil is collected in the oil separator, and the clean air from which the oil has been removed is released to the outside.

Japanese Patent Application Publication No. 2014-091059

By the way, in the oil separator described in Patent Document 1, when the position of the exhaust port is determined, the position of the intake port is also determined. On the other hand, the position of the air dryer to be connected to the intake port differs depending on the vehicle to which it is installed. For this reason, depending on the location of the connection target such as an air dryer, the work of installing the connection hose between the connection target and the oil separator or the installation of the oil separator to the vehicle may be complicated, such as by routing and installing the connection hose that connects to the intake port. There is.

Note that these problems are not limited to oil separators that are connected to air dryers mounted on vehicles, but are generally common to oil separators that are attached to other attachment targets.

The present invention has been made in view of these circumstances, and its purpose is to provide an oil separator that is easy to install, regardless of the type of vehicle.

Hereinafter, means for solving the above problems and their effects will be explained.
An oil separator that solves the above problems includes a body provided with an intake port through which compressed air flows in and an exhaust port through which clean air is discharged, a filter section that houses a filter that separates compressed air into gas and liquid, and a drain reservoir that is attached to the body, covers the filter section together with the body, and stores drain liquid separated from compressed air, and includes at least two intake ports, each of which is attached to the body. The exhaust port is provided in an openable manner, and the exhaust port is provided in a portion of the body where the intake port is not provided.

According to the above configuration, at least two intake ports are provided in the body, and the exhaust port is provided in a portion of the body where no intake ports are provided. Therefore, the connection hose to the connection object can be connected to the intake port to which it is easy to attach, depending on the position of the connection object, which varies depending on the type of the attachment object. Therefore, the installation work of the oil separator is easy regardless of the type of object to be installed.

The oil separator is provided with at least three intake ports, the intake ports are openable on three of the four sides of the side wall of the body, and the exhaust ports are openable on three of the four sides of the side wall of the body. It is preferable that the intake port is provided on one side where the intake port is not provided.

According to the above configuration, the intake ports are provided on three of the four sides of the side wall of the body, and the exhaust ports are provided on the remaining one of the four sides of the side wall of the body. Therefore, the position of the intake port relative to the exhaust port can be selected from three of the four sides on the side wall of the body, and the gap between the intake ports can be set large, making it easy to install the oil separator. .

It is preferable for the oil separator to include a mounting member having a mounting part rotatably mounted to the body and a fixing part fixed to the object to which the oil separator is mounted.

According to the above configuration, since the body is rotatable at the mounting part of the mounting member, the position of the exhaust port can be selected by rotating the body with respect to the mounting member, and the position of the intake port can also be selected from three sides. can do.

Regarding the oil separator, the body includes one of a female screw and a male screw screwed into the female screw, and the drain reservoir includes the other of the female screw and the male screw, It is preferable that the body and the drain reservoir are fixed by the female screw and the male screw.

According to the above configuration, the body and the drain reservoir are fixed by the female screw and the male screw. Therefore, by rotating the drain reservoir in the screw direction, the drain reservoir can be easily attached to and detached from the body.

It is preferable that the oil separator is provided with a guide portion that extends from a portion where the male screw is provided and guides the male screw when screwed together with the female screw.
According to the above configuration, since the guide portion is provided at the tip of the male screw portion, the guide portion contacts the female screw portion before the tip of the male screw portion contacts the tip of the female screw portion. Therefore, the male screw can be easily aligned with the female screw, and the drain reservoir can be easily attached to the body.

Regarding the oil separator, it is preferable that the length of the guide portion is set larger than the length of the female screw.
According to the above configuration, the length of the guide portion is set larger than the length of the female screw. Therefore, the guide portion contacts the entire female screw portion before the tip of the male screw portion contacts the tip of the female screw portion. Therefore, since the male screw starts to engage the female screw while the guide portion is in contact with the entire female screw, the guiding function can be enhanced.

According to the present invention, the installation work of the oil separator is easy regardless of the type of vehicle.

FIG. 1 is a block diagram showing a schematic configuration of a compressed air drying system to which an oil separator is applied in an embodiment of the oil separator. FIG. 3 is a perspective view showing the configuration of an oil separator according to the embodiment. FIG. 3 is a 3-3 sectional view showing the structure of the body of the oil separator of the same embodiment. 4-4 sectional view showing the structure of the oil separator of the same embodiment. FIG. 3 is an exploded sectional view showing the structure of the oil separator of the same embodiment. FIG. 3 is an enlarged view showing the structure of a male threaded portion and a female threaded portion of the oil separator of the same embodiment. FIG. 3 is an enlarged view showing the structure of a male threaded portion and a female threaded portion of the oil separator of the same embodiment. The figure which shows the modification of the guide part provided in the male screw part of an oil separator.

An embodiment in which an oil separator is applied to a compressed air drying system mounted on a vehicle will be described below with reference to FIGS. 1 to 7.
As shown in FIG. 1, a compressed air drying system is provided downstream of the compressor 1 to remove oil and moisture from the compressed air sent from the compressor 1. The compressed air drying system is provided with an air dryer 2 that removes oil and moisture from compressed air. A desiccant 2a is provided inside the air dryer 2. The air dryer 2 performs a load operation in which compressed air is passed through the desiccant 2a to remove moisture and oil, and an unload operation in which the desiccant 2a is regenerated by discharging moisture and oil trapped in the desiccant 2a to the outside. and do it. The air dryer 2 sends dry compressed air, which is air from which oil and moisture have been removed from compressed air through load operation, to the system tank 6 . The system tank 6 supplies compressed air to various systems such as brakes and suspension. When the pressure in the system tank 6 reaches a predetermined value, the exhaust valve 2b of the air dryer 2 is opened and unloading operation is performed. When the exhaust valve 2b is opened, dry compressed air is supplied from the system tank 6 to the air dryer 2, and the dry compressed air flowing into the air dryer 2 flows in the opposite direction to the road operation. As a result, moisture and oil trapped in the desiccant 2a are removed. The removed moisture and oil are discharged from the drain outlet 2c of the air dryer 2 along with the air. The air discharged from the air dryer 2 is called purge air.

The compressed air drying system is provided with a first oil mist separator 7 and a second oil mist separator 8 that remove oil mist from compressed air. Two oil mist separators 7 and 8 are provided between the compressor 1 and the air dryer 2. The first oil mist separator 7 is provided upstream of the second oil mist separator 8 on the compressor 1 side. A check valve 9 is provided between the first oil mist separator 7 and the second oil mist separator 8 to prevent backflow from the second oil mist separator 8 to the first oil mist separator 7. A check valve 9 is provided between the second oil mist separator 8 and the air dryer 2 to prevent backflow from the air dryer 2 to the second oil mist separator 8.

The oil mist separator 7 has a filter 7a, and captures oil mist contained in the compressed air sent out from the compressor 1 by passing the compressed air through the filter 7a. The oil mist separator 7 includes a regeneration tank (not shown) that stores compressed air for regeneration, and when the pressure in the regeneration tank due to the compressed air supplied from the system tank 6 reaches a predetermined value, the oil mist separator 7 The mist valve 7b is opened, and dry compressed air is supplied from the regeneration tank to the oil mist separator 7. As a result, the oil mist captured by the filter 7a is removed. The removed oil mist is discharged from the drain outlet 7c of the oil mist separator 7 together with air. The air discharged from the oil mist separator 7 is called purge air.

Further, the oil mist separator 8 includes a filter 8a, and captures oil mist contained in the compressed air sent out from the compressor 1 by passing the compressed air through the filter 8a. The oil mist separators 8 each include a regeneration tank (not shown) that stores compressed air for regeneration, and when the pressure in the regeneration tank due to the compressed air supplied from the system tank 6 reaches a predetermined value, the oil mist separator 8 The exhaust valve 8b is opened and dry compressed air is supplied to the oil mist separator 8 from the regeneration tank. As a result, the oil mist captured by the filter 8a is removed. The removed oil mist is discharged from the drain outlet 8c of the oil mist separator 8 together with air. The air discharged from the oil mist separator 8 is called purge air.

In the compressed air drying system, the oil separator 5 is connected to the drain outlet 7c of the oil mist separator 7, the drain outlet 8c of the oil mist separator 8, and the drain outlet 2c of the air dryer 2. The oil separator 5 is connected to the first oil mist separator 7 via a connection hose 7d that is connected to a drain outlet 7c of the first oil mist separator 7. Further, the oil separator 5 is connected to the second oil mist separator 8 via a connection hose 8d that is connected to a drain outlet 8c of the second oil mist separator 8. Further, the oil separator 5 is connected to the air dryer 2 via a connection hose 2d that is connected to a drain outlet 2c of the air dryer 2.

The oil separator 5 separates compressed air containing oil and moisture into gas and liquid, and discharges the separated clean air from the discharge port 5c. Further, the oil separator 5 stores a drain liquid, which is a liquid containing oil and moisture separated from compressed air, in its housing 5a.

Next, the oil separator 5 will be described in detail with reference to FIGS. 2 to 7.
As shown in FIG. 2, the housing 5a of the oil separator 5 includes a cylindrical body 10 and a drain bowl 30 that is a drain reservoir attached to the body 10. A mounting member 70 is attached to the outer periphery of the body 10 to be attached to a vehicle to which the body 10 is attached. A mounting groove 15 for mounting a mounting member 70 is provided on the outer periphery of the body 10. The mounting member 70 has a mounting portion 71 that is rotatably mounted to the body 10 and a fixing portion 76 that is fixed to the vehicle. The mounting portion 71 has an annular portion 72 formed in an annular shape, and a tightening portion 73 that tightens the annular portion 72 with a bolt 74 and a nut 75. The fixing portion 76 is fixed to the vehicle with a bolt (not shown). Therefore, the position of the body 10 can be changed by 360° at the mounting portion 71.

As shown in FIG. 3, the body 10 includes three intake ports 16 and one exhaust port 17. The intake ports 16 are provided in three of the four sides of the side wall of the body 10 so as to be openable. The term "four directions" here refers to each direction within a range of 90 degrees, which is obtained by dividing 360 degrees into four. Each intake port 16 may be provided at any position within each range. In this embodiment, two oil mist separators 7 and 8 and one air dryer 2 are connected, so all three intake ports 16 are open. A connecting hose 7d connected to the drain outlet 7c of the first oil mist separator 7, a connecting hose 8d connected to the drain outlet 8c of the second oil mist separator 8, and a drain outlet 2c of the air dryer 2. A connecting hose 2d is connected to each intake port 16, respectively. Note that the optimum connection destination of each connection hose 7d, 8d, 2d is selected from each intake port 16.

The exhaust port 17 is provided on one of the four sides of the side wall of the body 10 where the intake port 16 is not provided. The exhaust port 17 is provided with an exhaust port 5c.
As shown in FIG. 4, one end of the body 10 is closed and the other end has an opening 11. A female screw 12 is provided on the inner peripheral surface of the body 10 on the opening 11 side.

The drain bowl 30 is formed into a cylindrical shape. The drain bowl 30 has a bottom at one end. The drain bowl 30 has an opening 31 at the other end. A storage section 32, which is a space for storing drain liquid, is provided inside the drain bowl 30. A male screw 33 is provided on the outer peripheral surface of the opening 31 of the drain bowl 30. The drain bowl 30 is fixed to the body 10 by screwing together the female screw 12 of the body 10 and the male screw 33 of the drain bowl 30. The oil separator 5 is fixed to the vehicle side with the body 10 disposed vertically upward and the drain bowl 30 disposed vertically downward, and drain liquid is stored in the drain bowl 30. The stored drain liquid is discarded by removing the drain bowl 30 from the body 10.

A filter section 40 is fixed to the bottom of the body 10. The filter section 40 includes a filter case 41, a filter 42 housed inside the filter case 41, and a filter lid 43.

An annular protrusion 13 is provided inside the body 10 and at the radially central portion of the bottom thereof. A female screw 14 is provided on the inner peripheral surface of the annular protrusion 13 . Moreover, the filter case 41 is formed in a cylindrical shape. A ceiling portion 53 is provided at one end of the filter case 41 . An opening 54 is provided at the other end of the filter case 41 . An annular protrusion 51 that protrudes to the outside of the filter case 41 is provided at the radially central portion of the ceiling portion 53 . A male screw 52 is provided on the outer peripheral surface of the annular protrusion 51 . The filter part 40 is fixed to the body 10 by screwing together the female screw 14 of the body 10 and the male screw 52 of the filter case 41.

A plurality of first ventilation holes 56 are formed in the peripheral wall portion 55 of the filter case 41 . A plurality of rows of first ventilation holes 56 are formed in the peripheral wall portion 55 along the circumferential direction. A filter outlet 57 is provided at the center of the ceiling portion 53 and surrounded by the annular protrusion 51 . The filter outlet 57 has a plurality of second ventilation holes 58 that communicate the inside and outside of the filter case 41 .

The filter lid 43 is provided to close the opening of the filter case 41. A plurality of discharge holes 44 are formed in the filter lid 43 . The filter 42 is housed in a space formed by the filter case 41 and the filter lid 43. The filter 42 has many pores through which compressed air passes. The filter 42 is made of, for example, a sponge having many bubbles (urethane foam), a molded metal material such as metal wire or metal foil and having many pores (crushed aluminum), glass fiber, etc. Consisting of

The compressed air that has flowed into the filter 42 from the first vent hole 56 of the filter case 41 collides with the filter 42 and is separated into gas and liquid. The drain liquid separated by the filter 42 flows vertically downward in the filter 42 due to gravity and falls into the storage section 32 through the discharge hole 44 . The clean air separated by the filter 42 is also discharged from the filter section 40 through the second vent hole 58 of the filter outlet 57.

Further, the intake port 16 of the body 10 is connected to the air dryer 2 via a connecting hose 2d (see FIG. 1). The intake port 16 is connected to a first passage 18 extending toward the opening 11 of the body 10 .

The first passage 18 is connected to a reservoir 32 of the drain bowl 30. The first passage 18 and the storage section 32 of the drain bowl 30 function as a first expansion chamber 34 in which the compressed air flowing in through the intake port 16 expands. As the compressed air expands within the first expansion chamber 34, oil and moisture in the compressed air tend to aggregate.

The exhaust port 17 of the body 10 discharges clean air separated into gas and liquid by the filter section 40 to the outside. Exhaust port 17 is connected to second passage 19 . The second passage 19 is formed in a substantially L-shape. The second passage 19 functions as a second expansion chamber 23. Although the space in the front stage of the filter case 41 is defined as the first expansion chamber 34 and the space in the rear stage as the second expansion chamber 23, the space inside the filter case 41 is also defined as the first expansion chamber 34 and the second expansion chamber 23. Although the expansion effect is lower in comparison, it has the function of expanding the compressed air by passing through the first ventilation hole 56.

Next, the assembly of the body 10, filter section 40, and drain bowl 30 will be described with reference to FIGS. 5 to 7.
First, the filter section 40 is attached to the body 10 by screwing the male screw 52 of the filter section 40 into the female screw 14 of the body 10 . Subsequently, the drain bowl 30 is attached to the body 10 by screwing the male screw 33 of the drain bowl 30 into the female screw 12 of the body 10.

Note that when replacing the filter 42, the drain bowl 30 is removed from the body 10, and then the filter section 40 is removed from the body 10. Then, the filter lid 43 is removed from the filter case 41 and the filter 42 is replaced. Note that the filter section 40 itself may be replaced.

Here, the assembly of the body 10 and the drain bowl 30 will be described in detail.
As shown in FIGS. 6 and 7, a guide portion 35 extending from the portion where the male screw 33 is provided is provided at the tip of the portion of the drain bowl 30 where the male screw 33 is provided. Therefore, before the tip of the male screw 33 of the drain bowl 30 contacts the tip of the female screw 12 of the body 10, the guide portion 35 contacts the female screw 12 of the body 10, and The drain bowl 30 can be guided against the drain bowl 30.

A tip outer peripheral corner portion 35a of the guide portion 35 is chamfered at an angle θ. Therefore, it is possible to reduce the possibility of the guide portion 35 getting caught when it comes into contact with the female screw 12 of the body 10.
Further, the axial length A of the guide portion 35 is set to be larger than the axial length B of the female screw 12 of the body 10. Therefore, before the tip of the male screw 33 of the drain bowl 30 contacts the tip of the female screw 12 of the body 10, the guide portion 35 contacts the entire female screw 12 of the body 10. That is, since the male screw 33 of the drain bowl 30 starts screwing into the female screw 12 of the body 10 while the guide portion 35 is in contact with the entire female screw 12 of the body 10, the guide function can be enhanced. can.

Next, with reference to FIG. 2, attachment of the oil separator 5 to the vehicle will be described. First, the mounting member 70 is rotatably attached to the outer periphery of the body 10 of the oil separator 5. Then, by rotating the body 10 relative to the mounting member 70, the position of the exhaust port 17 provided in the body 10 relative to the mounting member 70 is selected. Thereby, the position of the exhaust port 17 relative to the vehicle to which the mounting member 70 is fixed can be selected. The mounting member 70 attached to the body 10 is fixed to the vehicle by inserting a bolt into the fixing portion 76.

Subsequently, the connection hose 7d of the first oil mist separator 7, the connection hose 8d of the second oil mist separator 8, and the air dryer 2 are connected to the three intake ports 16 provided in the body 10 of the oil separator 5 fixed to the vehicle. Select a position where it is easy to attach the connecting hoses 2d and connect them.

Next, the function of the oil separator 5 will be explained with reference to FIG. 4.
When the exhaust valve 2b of the air dryer 2 is opened and unloading operation is performed, drain fluid containing oil and moisture is sent to the oil separator 5 together with compressed air. Further, when the exhaust valves 7b and 8b of the oil mist separators 7 and 8 are opened, drain liquid containing oil mist is sent to the oil separator 5 through the respective connecting hoses 7d, 8d, and 2d together with compressed air. The drain liquid contained in the compressed air is in the form of mist or liquid. Compressed air containing drain liquid flows into the oil separator 5 from each intake port 16 .

The compressed air is expanded by flowing into the first expansion chamber 34 from the three intake ports 16. Note that the pressure of the compressed air expanded in the first expansion chamber 34 is maintained at a value greater than atmospheric pressure. The expanded compressed air flows into the filter section 40 through the first ventilation hole 56 of the filter case 41. The compressed air that has flowed into the filter section 40 passes through the filter 42 while repeatedly colliding with the walls of the pores and colliding with each other (friction) between the compressed air within the pores. Thereby, the compressed air is separated into drain liquid and clean air from which the drain liquid has been removed. The separated liquid drain liquid falls into the storage section 32. The separated clean air is directed to filter outlet 57. The clean air is compressed by passing through the second vent hole 58 of the filter outlet 57 and then expands within the second expansion chamber 23 (second passage 19). The clean air that has passed through the second passage 19 is exhausted to the outside from the exhaust port 17.

As described above, the oil separator 5 allows the orientation of the exhaust port 17 to be selected with respect to the vehicle, and also selects the direction in which the connection hoses 7d, 8d, and 2d can be easily attached from the three intake ports 16. be able to. Therefore, the installation work of the oil separator 5 can be facilitated regardless of the type of vehicle.

As explained above, according to this embodiment, the following effects can be achieved.
(1) Three intake ports 16 are provided on each side wall of the body 10, and an exhaust port 17 is provided in a portion of the side wall of the body where no intake port 16 is provided. For this reason, the connection hoses 7d, 8d, and 2d for connecting the oil mist separators 7 and 8 and the air dryer 2 are connected to the intake port 16, which is easy to attach, depending on the positions of the oil mist separators 7 and 8 and the air dryer 2, which differ depending on the type of vehicle. be able to. Therefore, the installation work of the oil separator 5 is easy regardless of the type of vehicle.

(2) The intake ports 16 are provided on three of the four sides of the side wall of the body 10, and the exhaust port 17 is provided on the remaining one of the four sides of the side wall of the body 10. Therefore, the position of the intake port 16 relative to the exhaust port 17 can be selected from three of the four sides on the side wall of the body 10, and the interval between the intake ports 16 can be set large, so that the oil separator 5 can be installed easily. Easy to work with.

(3) Since the body 10 is rotatable in the mounting portion 71 of the mounting member 70, the position of the exhaust port 17 can be selected by rotating the body 10 with respect to the mounting member 70, and the position of the intake port 16 can also be selected. can be selected from three sides.

(4) The body 10 and the drain bowl 30 are fixed by the female screw 12 and the male screw 33. Therefore, by rotating the drain bowl 30 with respect to the body 10 in the screw direction, the drain bowl can be easily attached to and detached from the body 10.

(5) Since the guide portion 35 is provided at the tip of the male screw 33 portion, the guide portion 35 comes into contact with the female screw 12 before the tip of the male screw 33 portion contacts the tip of the female screw 12 portion. do. Therefore, the male screw 33 can be easily aligned with the female screw 12, and the drain bowl 30 can be easily attached to the body 10.

(6) The axial length A of the guide portion 35 is set larger than the axial length B of the female screw 12 of the body 10. Therefore, the male screw 33 of the drain bowl 30 starts screwing into the female screw 12 of the body 10 while the guide part 35 is in contact with the entire female screw 12 of the body 10, so that the guide function can be enhanced. I can do it.

Note that the above embodiment can also be implemented in the following forms with appropriate changes.
- In the above embodiment, the tip outer peripheral corner portion 35a of the guide portion 35 is chamfered at an angle θ, but as shown in FIG. 8, the tip outer peripheral corner portion 35a of the guide portion 35 may be chamfered to have a radius R.

- In the above embodiment, the body 10 is provided with the female screw 12 and the drain bowl 30 is provided with the male screw 33, but the body 10 is provided with the male screw and the drain bowl 30 is provided with the female screw. A screw may also be provided. In this case, a guide portion is provided at the tip of the portion of the body 10 where the male screw is provided.

- In the above embodiment, the length A of the guide portion 35 of the drain bowl 30 is set larger than the length B of the female screw 12 of the body 10 in the axial direction. However, if the guiding function is obtained by the presence of the guide portion 35, the length A of the guide portion 35 may be set to be the same as or smaller than the length B of the female screw 12 of the body 10 in the axial direction. .

- Although the guide part 35 was provided in the drain bowl 30 in the said embodiment, if a guide function is unnecessary, you may omit the guide part 35.
- In the above embodiment, the oil separator 5 is fixed to the vehicle by attaching the mounting member 70 to the body 10, but the body 10 of the oil separator 5 may be directly fixed to the vehicle.

- The drain bowl 30 of the oil separator 5 of the above embodiment may be provided with a drain outlet for discharging the drain liquid stored in the storage section 32.
- In the above embodiment, three intake ports 16 are provided on the side wall of the body 10, but four or more intake ports may be provided on three of the four sides. That is, when four or more intake ports are provided, a plurality of intake ports are provided on any of the four sides. In this way, four or more connection hoses can be connected to the oil separator while selecting the optimum intake port position.

- In the above embodiment, the compressed air drying system includes two oil mist separators 7 and 8 and one air dryer 2, but the compressed air drying system includes one oil mist separator and one air dryer 2. It can also be used as a system. In this case, the connection hose of the oil mist separator and the connection hose of the air dryer 2 are connected to each other by selecting intake ports 16 at optimal positions of the oil separator 5. Note that since two of the three intake ports 16 are selected and used, the remaining one intake port 16 is closed by fitting a closing member (not shown).

- In the above embodiment, the intake ports 16 are provided at positions within each range of 90 degrees obtained by dividing 360 degrees into four on the side wall of the body 10, but the intervals between the intake ports 16 may be set at any angle.

- In the above embodiment, all the intake ports 16 are provided on the side wall of the body 10, but at least one intake port 16 may be provided on the upper wall of the body 10.
-Also, if it is not necessary to remove oil mist upstream of the air dryer 2, a compressed air drying system including one air dryer 2 may be used. In this case, the connection hose of the air dryer 2 is connected to the intake port 16 of the oil separator 5 at an optimal position. Note that since one intake port 16 out of the three intake ports 16 is selected and used, the remaining two intake ports 16 are closed by fitting a closing member (not shown).

- In the above embodiment, the filter section 40 may have a structure other than the filter 42 made of the above-mentioned material as long as it can separate gas and liquid in compressed air. For example, a configuration may be adopted in which a baffle plate is provided inside the filter case 41, or a configuration in which compressed air collides with the baffle plate may be used to separate gas and liquid.

- In the above embodiment, the oil contained in the air sent out from the compressor 1 is removed by the oil separator 5, but the oil contained in the gas sent out from equipment other than the compressor may be removed by the oil separator.

- In the above embodiment and other embodiments, the oil separator 5 is applied to a compressed air drying system mounted on a vehicle, but any system having a function of separating oil-containing air (gas) from gas to liquid may be used. It may also be applied to other systems. For example, the oil separator may be applied to moving objects other than vehicles such as trains, ships, and aircraft. Further, the oil separator may be applied to a system operated using air pressure provided in a place other than a moving body.

1... Compressor, 2... Air dryer, 2a... Desiccant, 2b... Exhaust valve, 2c... Drain outlet, 2d... Connection hose, 5... Oil separator, 5a... Housing, 5c... Outlet, 6... System tank, 7...First oil mist separator, 8...Second oil mist separator, 7a, 8a...Filter, 7b, 8b...Exhaust valve, 7c, 8c...Drain outlet, 7d, 8d...Connection hose, 9...Check valve , 10... Body, 11... Opening, 12... Female screw, 13... Annular protrusion, 14... Female screw, 15... Mounting groove, 16... Intake port, 17... Exhaust port, 18... First passage, 19... Third 2 passage, 23... Second expansion chamber, 30... Drain bowl, 31... Opening, 32... Reservoir, 33... Male screw, 34... First expansion chamber, 35... Guide part, 35a... Tip outer peripheral corner, 40 ...filter part, 41...filter case, 42...filter, 43...filter lid, 44...discharge hole, 51...annular projection, 52...male screw, 53...ceiling part, 54...opening part, 55...peripheral wall part, 56 ...First vent hole, 57... Filter outlet, 58... Second vent hole, 70... Mounting member, 71... Mounting part, 72... Annular part, 73... Tightening part, 74... Bolt, 75... Nut, 76... Fixed part.

Claims (4)

A body provided with an intake port through which compressed air flows in and an exhaust port through which clean air is discharged;
a filter section that is provided in the body and separates compressed air into gas and liquid;
a drain reservoir that is attached to the body and stores drain liquid separated from compressed air;
a mounting member having a mounting part that is rotatably mounted to the body and a fixing part that is fixed to an object to which the oil separator is mounted;
At least two intake ports are provided,
The exhaust port and the one intake port are respectively provided so as to be openable at opposing positions among the four sides of the side wall of the body,
The other intake port is provided so as to be openable on any of the remaining four sides of the side wall of the body. The body includes either a female screw or a male screw screwed into the female screw,
The drain reservoir includes the other of the female screw and the male screw,
The oil separator according to claim 1, wherein the body and the drain reservoir are fixed by the female screw and the male screw. The oil separator according to claim 2 , further comprising a guide portion that extends from a portion where the male screw is provided and guides the male screw when the male screw is screwed together with the female screw. The oil separator according to claim 3 , wherein the length of the guide portion is set larger than the length of the female screw.

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