JP7235823B2 - 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 machines use compressed air sent from a compressor directly connected to an 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 the compressed air containing water or oil enters into each system, it causes rust and swelling of rubber members (O-rings, etc.), which causes malfunction. For this reason, an air dryer is provided downstream of the compressor to remove moisture and oil from the compressed air.

Air dryers are provided with a desiccant to remove moisture and a filter to capture oil. This air dryer has a dehumidification function of removing moisture in the compressed air sent from the compressor and a regeneration function of discharging the moisture adsorbed by the desiccant to the outside.

Since the air discharged from the air dryer during regeneration of 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 load (see, for example, Patent Document 1). . This oil separator has a collision material in the housing against which air containing water and oil collides, and separates the water and oil contained in the air by causing the air to collide with the collision material. The separated oil is collected in the case of the oil separator, and clean air from which the oil has been removed is released to the outside.

JP 2014-091059 A

By the way, in the oil separator described in Patent Document 1, the amount of drain liquid in the case is confirmed by the position of the drain liquid in the drain hose connected to the drain outlet of the case. When checking the amount of the drain fluid, remove the tip of the drain hose and let the air flow into the drain hose so that the height of the drain fluid accumulated in the case and the drain fluid in the drain hose is the same. ing. Thus, it is inconvenient to have to operate the drain hose.

These problems are not limited to oil separators connected to air dryers mounted on vehicles, but are generally common to oil separators attached to other attachment objects.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an oil separator in which the amount of drain liquid can be easily checked.

Means for solving the above problems and their effects will be described below.
The oil separator that solves the above problems consists of an intake port into which compressed air flows, an exhaust port from which clean air is discharged, a filter section that separates the compressed air from liquid and gas, and a drain reservoir that stores the drain liquid separated from the compressed air. The gist thereof is to include a portion, a light-transmitting portion through which the inside of the drain reservoir portion can be visually recognized, and a protective cover that protects the light-transmitting portion.

According to the above configuration, the inside of the drain reservoir can be seen through the translucent part, so that the amount of the accumulated drain liquid can be easily confirmed. Also, since this translucent part is protected by a protective cover, even if the strength of the translucent part is reduced due to the adoption of a translucent material, it is still possible to prevent damage from flying stones, etc. from the road surface. can.

Regarding the above oil separator, it is preferable that the protective cover has a rotating member that is partially opened with respect to the entire circumference of the drain reservoir and that rotates in the circumferential direction of the drain reservoir.

According to the above configuration, the position of the opening of the protective cover can be changed in the circumferential direction of the drain reservoir. Therefore, while protecting the drain reservoir by aligning the non-opening part of the protective cover with the drain reservoir where stones and the like are likely to fly from the road surface, etc., the transparent part of the drain reservoir is prevented from the opening part of the protective cover. You can check the amount of drain liquid via

In the oil separator, it is preferable that the entire drain reservoir is a translucent part, and the protective cover covers the entire periphery of the drain reservoir, has a window, and is attached to the drain reservoir.

According to the above configuration, the drain reservoir can be reliably protected by the protective cover that covers the entire drain reservoir. The amount of liquid can be checked.

In the oil separator, through holes having the same central axis are provided in the bottom portion of the drain reservoir and the bottom portion of the protective cover. and a fixing member for fixing the drain reservoir and the protective cover.

According to the above configuration, since the drain reservoir and the protective cover are simply provided with through holes, it is possible to eliminate the need for a mounting structure for the drain reservoir. Further, the drain reservoir and the protective cover can be fixed by a fitting member and a fixing member which are separate members.

In the oil separator, a through hole is provided in the bottom portion of the drain reservoir portion and the bottom portion of the protective cover, and a female screw is provided in the through hole of the drain reservoir portion. It is preferable to provide a fixing member that is screwed to fix the drain reservoir and the protective cover.

According to the above configuration, by using the fixing member in addition to the drain reservoir and the protective cover, the protective cover can be fixed to the drain reservoir without using a member inside the drain reservoir. .

In the oil separator, it is preferable that the fixed member is provided with a discharge valve for discharging the drain liquid accumulated in the drain reservoir.
According to the above configuration, since the drain reservoir is provided with the drain valve, the drain liquid in the drain reservoir can be discharged to the outside through the drain valve without removing the drain reservoir.

According to the present invention, it is possible to easily check the amount of drain liquid.

1 is a block diagram showing a schematic configuration of a compressed air drying system to which an oil separator is applied in a first embodiment of the oil separator; FIG. The top view which shows the structure of the oil-separator of the same embodiment. The perspective view which shows the structure of the oil-separator of the same embodiment. 4-4 sectional view showing the structure of the oil separator of the same embodiment. The side view which shows the structure in 2nd Embodiment of an oil separator. An exploded cross-sectional view showing a mounting structure of a protective cover for an oil separator according to the same embodiment. Sectional drawing which shows the structure of the oil-separator of the same embodiment. The side view which shows the modification of the attachment structure of the protective cover of an oil separator. The figure which shows the modification of the protective cover of an oil separator. The figure which shows the modification of the protective cover of an oil separator. The figure which shows the modification of the translucent part of the drain bowl of an oil separator. The figure which shows the modification of the translucent part of the drain bowl of an oil separator.

(First embodiment)
A first 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 4. FIG.

As shown in FIG. 1, downstream of the compressor 1, a compressed air drying system is provided for removing oil and moisture from the compressed air sent from the compressor 1. As shown in FIG. The compressed air drying system is provided with an air dryer 2 that removes oil and moisture from the compressed air. A desiccant 2 a is provided in the air dryer 2 . The air dryer 2 has 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 moisture and oil trapped in the desiccant 2a is discharged to the outside to regenerate the desiccant 2a. and The air dryer 2 delivers to the system tank 6 dry compressed air, which is compressed air from which oil and moisture have been removed by load operation. A system tank 6 supplies compressed air to each system such as a brake and a 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 the 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 direction opposite to that during road operation. As a result, water and oil trapped in the desiccant 2a are removed. The removed moisture and oil are sent out from the drain outlet 2c of the air dryer 2 together with the air. The air discharged from the air dryer 2 is called purge air.

Further, in the compressed air drying system, an oil separator 5 is provided at the drain outlet 2c of the air dryer 2. As shown in FIG. The oil separator 5 is connected to a drain outlet 2c of the air dryer 2 via a connection hose 2d.

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

Next, the oil separator 5 will be described in detail with reference to FIGS. 2 to 4. FIG.
As shown in FIGS. 2 and 3, the housing 5a of the oil separator 5 includes a cylindrical body 10 and a drain bowl 30 attached to the body 10 and serving as a drain reservoir. An attachment member 70 is attached to the outer periphery of the body 10 for attachment to a vehicle to which the body 10 is attached. A mounting groove 15 for mounting the mounting member 70 is provided on the outer periphery of the body 10 . The attachment member 70 has an attachment portion 71 rotatably attached to the body 10 and a fixing portion 76 fixed to the vehicle. The mounting portion 71 has an annular portion 72 formed in an annular shape and a tightening portion 73 for fastening the annular portion 72 with a bolt 74 and a nut 75 . The fixing portion 76 is fixed to the vehicle by bolts (not shown). Therefore, the body 10 can change the position of the mounting portion 71 by 360°.

A protective cover 80 is attached to the outer circumference of the body 10 to protect the drain bowl 30 . A portion of the protective cover 80 is open around the entire periphery of the drain bowl 30 . The protective cover 80 has a substantially semicircular shape when viewed from above, and is open on the rear side in the traveling direction of the vehicle. The protective cover 80 has a cover member 81 made of a plate material and three mounting bolts 82 . Three through holes 81a into which the mounting bolts 82 are fitted are arranged at intervals of 90° in the upper portion of the cover member 81 . The cover member 81 is desirably made of a material that is strong enough to prevent stones or the like flying from the road surface or the like from penetrating it, and is particularly preferably made of metal.

Four mounting portions 25 for mounting mounting bolts 82 are provided below the mounting grooves 15 on the outer periphery of the body 10 . The four mounting portions 25 are arranged at intervals of 90°. The mounting portions 25 are each provided with a female screw 26 to be screwed with the mounting bolt 82 . That is, the cover member 81 is fixed to the body 10 with the three mounting bolts 82 by selecting the three mounting portions 25 out of the four mounting portions 25 . Therefore, the position of the protective cover 80 can be selected every 90 degrees with respect to the body 10 . The three through holes 81 a of the cover member 81 , the three mounting bolts 82 , and the four mounting portions 25 function as rotating members that rotate the protective cover 80 in the circumferential direction of the body 10 .

The body 10 has an intake port 16 and an exhaust port 17 . A connection hose 2 d connected to a drain outlet 2 c of the air dryer 2 is connected to the intake port 16 . The exhaust port 17 is provided with an exhaust port 5c.

As shown in FIG. 4, the body 10 is closed at one end and has an opening 11 at the other end. A female screw 12 is provided on the inner peripheral surface of the body 10 on the side of the opening 11 .
The drain bowl 30 is cylindrically formed from a translucent material. In particular, the drain bowl 30 is preferably made of a transparent material such as a resin such as polycarbonate so that the amount of drain liquid accumulated inside can be visually recognized. The entire drain bowl 30 is a translucent portion. One end of drain bowl 30 has a bottom. The other end of drain bowl 30 has an opening 31 . Inside the drain bowl 30, a storage portion 32, which is a space for storing the drain liquid, is provided. 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 the female thread 12 of the body 10 and the male thread 33 of the drain bowl 30 together. The cover member 81 of the protective cover 80 is set to have a length that includes from the mounting portion 25 of the body 10 to the bottom of the drain bowl 30 .

A drain valve 35 is provided at the bottom of the drain bowl 30 for discharging the drain liquid stored in the reservoir 32 . That is, a through hole 36 is provided in the center of the bottom of the drain bowl 30 . A fitting member 37 is fitted into the through hole 36 . The inserting member 37 includes a disk-shaped sealing portion 37 a that is in close contact with the inner side of the bottom of the drain bowl 30 and a cylindrical inserting portion 37 b that is inserted into the through hole 36 . A male screw 37c is formed on the outer periphery of the fitting portion 37b. A disc-shaped fixing member 38 is provided on the outside of the bottom of the drain bowl 30 so as to be screwed onto the male screw 37c of the insertion member 37 and fixed to the drain bowl 30 . A female screw 38 a is provided in the center of the fixing member 38 . The fitting member 37 and the fixing member 38 are fixed to the drain bowl 30 by screwing the fixing member 38 onto the fitting member 37 and tightening them. A discharge valve 35 is attached to the fitting portion 37 b of the fixing member 38 .

The oil separator 5 is fixed to the vehicle with the body 10 arranged vertically upward and the drain bowl 30 arranged vertically downward, and stores the drain liquid in the drain bowl 30 . The stored drain liquid is discharged to the outside by opening the discharge valve 35 provided at the bottom of the drain bowl 30 .

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

An annular projecting portion 13 is provided inside the body 10 and at the center portion in the radial direction of the bottom portion 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 in 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 portion 40 is fixed to the body 10 by screwing the female thread 14 of the body 10 and the male thread 52 of the filter case 41 together.

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

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

Compressed air that has flowed into the filter 42 from the first air 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 downward in the vertical direction through the filter 42 due to gravity, and drops into the reservoir 32 through the discharge hole 44 . Also, the clean air separated by the filter 42 is discharged from the filter section 40 through the second vent hole 58 of the filter outlet 57 .

Also, the intake port 16 of the body 10 is connected to a first passage 18 extending toward the opening 11 side of the body 10 . The first passageway 18 connects to the reservoir 32 of the drain bowl 30 . The first passage 18 and the storage portion 32 of the drain bowl 30 function as a first expansion chamber 34 in which the compressed air flowing through the intake port 16 expands. As the compressed air expands in the first expansion chamber 34, oil and moisture in the compressed air tend to condense.

The exhaust port 17 of the body 10 discharges clean air separated from gas and liquid by the filter section 40 to the outside. The exhaust port 17 is connected to the 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 .

Next, with reference to FIG. 4, assembly of the body 10 of the oil separator 5, the filter portion 40 and the drain bowl 30 will be described.
First, the filter section 40 is attached to the body 10 by screwing the male thread 52 of the filter section 40 into the female thread 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 .

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. In addition, you may replace|exchange the filter part 40 itself.

Next, with reference to FIG. 2, attachment of the oil separator 5 to the vehicle will be described.
Before attaching the oil separator 5 to the vehicle, the position of the protective cover 80 attached to the oil separator 5 is changed according to the position of the oil separator 5 attached to the vehicle. The three mounting bolts 82 are removed from the respective mounting portions 25, and the through holes 81a of the cover member 81 are aligned with the mounting portions 25 to be mounted, and the three mounting bolts 82 are screwed into the respective mounting portions 25. As shown in FIG. For example, a protective cover 80 is attached to the oil separator 5 so as to cover the oil separator 5 on the traveling direction side of the vehicle. Note that the position of the protective cover 80 with respect to the oil separator 5 may be changed after the oil separator 5 is attached to the vehicle. Accordingly, even if the position of the oil separator 5 with respect to the vehicle is changed in the circumferential direction by the mounting member 70, the protective cover 80 can be changed at intervals of 90 degrees.

First, the mounting member 70 is attached to the outer circumference of the body 10 of the oil separator 5 in a rotatable state. By rotating the body 10 with respect to the mounting member 70 , the position of the exhaust port 17 provided in the body 10 with respect 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 through the fixing portion 76 . Subsequently, the connection hose 2d of the air dryer 2 is connected to the intake port 16 provided in the body 10 of the oil separator 5 fixed to the vehicle.

Next, the action of the oil separator 5 will be described with reference to FIG.
When the exhaust valve 2b of the air dryer 2 is opened and the unloading operation is performed, drain liquid containing oil and water is sent to the oil separator 5 together with the compressed air. The drain liquid contained in the compressed air is mist or liquid. Compressed air containing drain liquid flows into the oil separator 5 from the intake port 16 .

Compressed air is expanded by flowing into the first expansion chamber 34 from the intake port 16 . The pressure of the compressed air expanded in the first expansion chamber 34 is maintained at a value higher than the atmospheric pressure. The expanded compressed air flows into the filter portion 40 through the first ventilation holes 56 of the filter case 41 . The compressed air that has flowed into the filter portion 40 passes through the filter 42 while repeatedly colliding with the wall surfaces of the pores and colliding (friction) between the compressed air within the pores. As a result, the compressed air is separated into the drain liquid and the clean air from which the drain liquid has been removed. The separated liquid drain liquid drops into the reservoir 32 . The separated clean air is directed to filter outlet 57 . The clean air is compressed by passing through the second vent 58 of the filter outlet 57 and then expanded in the second expansion chamber 23 (second passageway 19). The clean air that has passed through the second passage 19 is discharged from the exhaust port 17 to the outside.

As described above, the amount of drain liquid stored in the storage portion 32 inside the drain bowl 30 can be confirmed by viewing the drain bowl 30 from a portion where the protective cover 80 is not provided. In addition, since stones and the like flying from the road surface as the vehicle travels fly from the traveling direction side, even if the stones and the like fly, they are prevented from colliding with the protective cover 80 and colliding with the drain bowl 30. The drain bowl 30 can be protected. Therefore, it is possible to provide a drain bowl 30 that can directly check the amount of drain liquid. Moreover, even if the circumferential position of the oil separator 5 with respect to the vehicle is changed, the circumferential position of the protective cover 80 with respect to the oil separator 5 can be changed, so the protection by the protective cover 80 can be maintained.

As described above, according to this embodiment, the following effects can be obtained.
(1) Since the inside of the drain bowl 30 can be seen through the drain bowl 30 whose entirety is a translucent portion, the amount of accumulated drain liquid can be easily confirmed. In addition, since the drain bowl 30 is protected by the protective cover 80, even if the strength of the drain bowl 30 is reduced due to the use of a translucent material such as resin instead of metal, the Damage to the drain bowl 30 due to falling stones or the like can be prevented.

(2) The position of the opening of the protective cover 80 can be changed in the circumferential direction of the body 10 . Therefore, while protecting the drain bowl 30 by aligning the non-opening portion of the protective cover 80 with a position where stones are likely to fly into the drain bowl 30 from the road surface, etc., the entire area from the opening portion of the protective cover 80 is a transparent portion. The amount of drain liquid can be checked through a certain drain bowl 30 .

(3) Since the drain bowl 30 is provided with the drain valve 35, the drain liquid in the drain bowl 30 can be discharged to the outside through the drain valve 35 without removing the drain bowl 30 from the body 10. .

(Second embodiment)
A second embodiment of the oil separator will be described below with reference to FIGS. 5 to 7. FIG. The oil separator of this embodiment differs from that of the first embodiment in that the protective cover covers the entire drain bowl. The following description focuses on differences from the first embodiment.

As shown in FIGS. 5 and 7, the oil separator 5 is provided with a drain bowl 30 that is entirely translucent, as in the first embodiment. The oil separator 5 has a bottomed cylindrical protective cover 90 attached to the drain bowl 30 . The protective cover 90 covers the entire periphery of the drain bowl 30. - 特許庁The protective cover 90 is molded to the outer shape of the drain bowl 30 and matches the outer shape of the drain bowl 30 . Protective cover 90 is preferably made of metal.

A plurality of windows 91 are provided in the protective cover 90 . These windows 91 are slit-shaped extending in the axial direction (vertical direction) of the protective cover 90 and are provided at intervals. These windows 91 have a width in the circumferential direction that allows the amount of drain liquid stored inside the drain bowl 30 to be seen.

As shown in FIGS. 6 and 7, a through hole 36 is provided in the center of the bottom of the drain bowl 30 as in the first embodiment. A fitting member 37 is fitted into the through hole 36 . A fixing member 38 is provided on the outside of the bottom portion of the drain bowl 30 so as to be fixed to the drain bowl 30 by being screwed into the male screw 37c of the insertion member 37 . A through hole 92 having the same central axis as the through hole 36 of the drain bowl 30 is provided in the center of the bottom of the protective cover 90 . The fitting member 37 is fitted from the inside of the drain bowl 30 into the through hole 36 of the drain bowl 30 and the through hole 92 of the protective cover 90 . The fixing member 38 is screwed into the fitting member 37 from the outside of the protective cover 90 and tightened, thereby fixing the drain bowl 30 and the protective cover 90 . The protective cover 90 is thus fixed to the drain bowl 30 . A discharge valve 35 is attached to the fixed member 38 .

As described above, the amount of drain liquid stored in the storage portion 32 inside the drain bowl 30 can be confirmed by viewing the drain bowl 30 through the window 91 of the protective cover 90 . In addition, stones and the like flying from the road surface as the vehicle travels are prevented from colliding with the protective cover 90 and colliding with the drain bowl 30, so that the drain bowl 30 can be protected. Therefore, it is possible to provide a drain bowl 30 that can directly check the amount of drain liquid. Further, even if the circumferential position of the oil separator 5 with respect to the vehicle is changed, the protective cover 90 is provided all around the drain bowl 30, so the drain bowl 30 is protected regardless of the direction of the oil separator 5 with respect to the vehicle. can do.

As described above, according to the present embodiment, in addition to the effects (1) and (3) of the first embodiment, the following effects can be obtained.
(4) The protective cover 90 covering the entire drain bowl 30 can reliably protect the drain bowl 30, and the window 91 provided in the protective cover 90 allows the drain in the drain bowl 30, which is entirely a translucent portion, to flow through. The amount of liquid can be checked.

(5) Since the drain bowl 30 and the protective cover 90 are simply provided with the through holes 36 and 92, respectively, the drain bowl does not require a mounting structure. Further, the drain bowl 30 and the protective cover 90 can be fixed by the fitting member 37 and the fixing member 38 which are separate members.

The above-described embodiment can also be implemented in the following modes, which are appropriately modified.
In the above-described first embodiment, the through hole 81a of the protective cover 80 and the mounting portion 25 are provided at an interval of 90°. 25 may be spaced apart by less than 90°. Also, the combination of the number of through-holes 81a and the number of mounting portions 25 can be changed arbitrarily.

- In the first embodiment, the interval between the through holes 81a of the protective cover 80 and the interval between the mounting portions 25 are equal. However, the interval between the through-holes 81a of the protective cover 80 and the interval between the attachment portions 25 may be any interval other than the equal interval as long as the positions of the protective cover 80 and the attachment portion 25 are combined.

- In the first embodiment, the drain valve 35 is provided at the bottom of the drain bowl 30 by the fitting member 37 and the fixing member 38 . Further, in the second embodiment, the protective cover 90 is fixed to the drain bowl 30 by the fitting member 37 and the fixing member 38 . However, the fixing member may be fixed directly to the bottom of the drain bowl 30 . For example, as shown in FIG. 8, the bottom of the drain bowl 30 is thickened and a through hole 36 is provided in the bottom of the drain bowl 30 . A female screw 36 a is provided in the through hole 36 . A fixing member 39 is screwed into the female thread 36 a at the bottom of the drain bowl 30 . The fixing member 39 includes a disk-shaped sealing portion 39a that is in close contact with the outside of the bottom portion of the drain bowl 30, and a cylindrical portion 39b that is screwed into the female screw 36a. A male screw 39c is formed on the outer circumference of the cylindrical portion 39b. The fixing member 39 is fixed to the drain bowl 30 by screwing the fixing member 39 onto the female screw 36a and tightening it. A discharge valve 35 is attached to the fixed member 38 . In the case of a cylindrical protective cover 90 , the fixing member 39 fixes the protective cover 90 to the drain bowl 30 . In such a configuration, by using the fixing member 39 in addition to the drain bowl 30 and the protective cover 90, the protective cover 90 is fixed to the drain bowl 30 without using a member inside the drain bowl 30. be able to.

- In the said 2nd Embodiment, the slit-shaped window 91 was provided in the protective cover 90. FIG. However, the window of the protective cover 90 is not limited to the slit shape, and may have any shape that allows the amount of drain liquid inside the drain bowl 30 to be visually recognized. For example, as shown in FIG. 9, circular windows 93 may be arranged side by side in the circumferential and radial directions. The arrangement of windows can be changed arbitrarily.

- Moreover, you may form a protective cover with a tape material like an electric wire protection tape. The wire protection tape is a tape-like tape made of a sponge material to which an adhesive is added. Note that the adhesive may be omitted. For example, as shown in FIG. 10, the tape material 100 is directly wound around the drain bowl 30 to provide gaps 101 between the tape materials 100 here and there. The amount of drain liquid inside the drain bowl 30 is visually recognized through this gap 101 . In this way, the tape material 100, which is the protective cover itself, is directly wound, so that no member for fixing the protective cover of the drain bowl 30 is required. A ridge portion 102 may be provided on the outer peripheral surface near the bottom of the drain bowl 30 to prevent the tape material 100 from falling.

- In each of the above-described embodiments, the oil separator 5 employs the drain bowl 30 whose entirety is a translucent portion. However, a drain bowl partly provided with a translucent portion may be adopted as the oil separator 5 . For example, as shown in FIG. 11, the oil separator 5 includes a metal drain bowl 130 whose interior is invisible. Four through holes 131 are provided in the side surface of the drain bowl 130 at intervals of 90° in the circumferential direction. A bottomed cylindrical transmitting portion 110 is fitted in the through hole 131 . The transmissive portion 110 is made of a translucent material. The transmitting portion 110 includes a cylindrical portion 111 fitted in the through hole 131 and a disk portion 112 abutting on the outer peripheral surface of the drain bowl 130 . A user can visually recognize the inside of the drain bowl 130 through the disc portion 112 . A protective cover 80 having an opening is attached to the body 10 . The protective cover 80 is set to have a length that includes the transmissive portion 110 . The through hole 131 is preferably provided before the amount of drain liquid stored inside the drain bowl 30 becomes full. In this case, if the drain liquid is seen inside the drain bowl 30 through the transmission part 110, it is preferable to discharge the drain liquid. Note that the number and arrangement of the transmission portions 110 can be changed arbitrarily.

Also, as shown in FIG. 12, the oil separator 5 is provided with a drain bowl 130 made of, for example, metal whose interior cannot be visually recognized. The drain bowl 130 is provided with a connection hose 140 that connects the bottom and side portions of the drain bowl 130 . The connection hose 140 corresponds to the translucent portion. A through hole 132 is provided in the bottom of the drain bowl 130, and one end of a connection hose 140 is connected. A through hole 133 is provided in the side surface of the drain bowl 130, and the other end of the connection hose 140 is connected. The drain liquid stored inside the drain bowl 30 flows into the connection hose 140 from the bottom side. The liquid level of the drain liquid inside the connection hose 140 matches the liquid level of the drain liquid inside the drain bowl 30 . Connection hose 140 is made of a translucent material. A user can check the amount of drain liquid by looking at the connection hose 140 . A protective cover 80 having an opening is attached to the body 10 . The protective cover 80 is set to have a length that includes the connection hose 140 . The position of the through hole 133 in the side surface of the drain bowl 130 is preferably set at a height including the position where the amount of drain liquid is desired to be seen.

- In each of the above embodiments, the discharge valve 35 is provided at the bottom of the drain bowl 30 (130). However, if the drain bowl 30 (130) is removed from the body 10 and the drain liquid in the drain bowl 30 (130) is discarded, the discharge valve 35 may be omitted.

The structure of the oil separator 5 is similar to that of the above-described embodiment, provided that the purge air discharged from the air dryer 2 containing oil and moisture can be separated into drain liquid, which is a liquid containing oil and moisture, and clean air. Not limited to structure.

In the above embodiment, the oil contained in the air sent from the compressor 1 is removed by the oil separator 5, but the oil contained in the gas discharged 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. It may be applied to other systems. For example, the oil separator may be applied to moving bodies other than vehicles, such as trains, ships, and aircraft.

DESCRIPTION OF SYMBOLS 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, DESCRIPTION OF SYMBOLS 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... Second Passage 23 Second expansion chamber 25 Mounting portion 26 Female screw 30 Drain bowl 31 Opening 32 Storage portion 33 Male screw 34 First expansion chamber 35 Discharge valve , 36... Through hole 36a... Female screw 37... Fitting member 37a... Sealing part 37b... Fitting part 37c... Male screw 38... Fixing member 38a... Female screw 39... Fixing member 40... Filter part 41... Filter case 42... Filter 43... Filter cover 44... Discharge hole 51... Annular projection 52... Male screw 53... Ceiling part 54... Opening part 55... Peripheral wall part 56... First ventilation hole 57 Filter outlet 58 Second ventilation hole 70 Mounting member 71 Mounting part 72 Annular part 73 Tightening part 74 Bolt 75 Nut 76 Fixing Part 80 Protective cover 81 Cover member 81a Through hole 82 Mounting bolt 90 Protective cover 91 Window 92 Through hole 93 Window 100 Tape material 101 Gap 102 110: Permeable portion 111: Cylindrical portion 112: Disc portion 130: Drain bowl 131, 132, 133: Through hole 140: Connection hose.

Claims (3)

a housing comprising an intake port into which purged air discharged from the air dryer flows and an exhaust port into which clean air is discharged;
a filter unit that is housed in the housing and separates oil by colliding the purge air;
a drain reservoir provided in the housing for storing drain liquid containing oil separated from the purge air;
A connection hose connected to the bottom of the drain reservoir and to the side surface of the housing, the connection hose being made of a translucent material, the liquid surface and the interior of the drain liquid accumulated in the drain reservoir The connection hose that matches the liquid level of the drain liquid that has flowed into the
an attachment member rotatably attached to the housing for attachment to an object to which the oil separator is attached;
and a protective cover that protects the connection hose ,
The protective cover has a length that includes the connection hose, is partially open to the entire circumference of the drain reservoir, and includes a rotating member that rotates in the circumferential direction of the drain reservoir,
The connection hose is connected to a through hole provided in the side surface of the housing,
The position of the through-hole is set to a height including a position where the amount of drain liquid flowing into the connection hose is desired to be observed,
The mounting member selects the position of the exhaust port with respect to the mounting object. Oil separator. The mounting member has a mounting portion that is rotatably mounted to the housing and a fixing portion that is fixed to the mounting target,
A mounting groove for mounting the mounting portion is provided on the entire circumference of the housing,
The oil separator according to claim 1, wherein the mounting portion is rotatable relative to the housing along the mounting groove. The mounting portion includes an annular portion that is rotatably attached to the housing along the mounting groove and is formed in an annular shape, and a tightening portion that tightens the annular portion with a bolt and a nut. 3. The oil separator according to claim 2, comprising:

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