JP3272938B2 - Oil and moisture removal device for compressed air - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for removing oil and moisture from compressed air, and more particularly to a device for sufficiently removing compressed air containing a large amount of droplets and mist of water and oil. The present invention relates to a device for removing oil and moisture from compressed air that can be used.

[0002]

2. Description of the Related Art Conventionally, in vehicles such as railway cars and automobiles, compressed air used for actuation of brakes and opening and closing of doors has been disclosed in Japanese Patent Application Laid-Open No. 54-136575. Compressed air discharged from
It is used after passing through a desiccant filling tank filled with a desiccant such as silica gel to dehumidify. However, the conventional dehumidifying method of dehumidifying with a desiccant such as silica gel requires a large space for the desiccant filling tank in the vehicle because the tank for filling the desiccant becomes large. Replacement work is often required. For this reason, the inventors of the present invention have proposed, in place of the conventional dehumidifying method using a moisture absorbent, Japanese Patent Laid-Open No.
Attempts were made to use the membrane gas dryer proposed in 134244 and the like. This membrane-type gas dryer flows a steam mixture gas and a dehumidified dehumidification purge gas through a steam permeable membrane, and selectively separates water vapor in the steam mixture gas to a dehumidification purge gas side. Is discharged.

FIG. 9 schematically shows a dehumidification circuit using such a film-type gas dryer. In FIG. 9, after the compressed air C discharged from the compressor is cooled by the after cooler 50, the droplets of water, oil, etc. contained in the compressed air C are removed by the line filter 100, and The compressed air from which mist such as water and oil contained in the compressed air that has passed through is removed by the mist filter 102 is further supplied to the membrane gas dryer 60. Thus, the compressed air supplied to the membrane gas dryer 60 is supplied to the hollow fiber membrane 62.
Dry compressed air passed through the inside of the
A part of the dry compressed air is returned to the membrane gas dryer 60 by the return pipe 66 as purge air. The returned purge air flows outside the hollow fiber membrane 62 and is discharged from the discharge port 66 to the outside of the membrane gas dryer 60.

The dehumidification circuit using the membrane gas dryer 50 shown in FIG. 9 requires a special space for installing a desiccant filling tank or the like in a vehicle because the membrane gas dryer 50 is small and does not use a moisture absorbent. It is not necessary to secure it and it is not necessary to replace the hygroscopic agent. By the way, in vehicles such as railway vehicles and automobiles, the compressed air for operating the brakes and opening and closing the doors is used intermittently, so that the compressor is also operated intermittently. As described above, when the compressor is operated intermittently, when the stopped compressor is restarted, droplets and mist of water, oil, and the like accumulated in the aftercooler 50 and the like are pushed out at once. On the other hand, when compressed air including droplets such as water and oil and mist is supplied to the membrane gas dryer 60, the performance of the membrane gas dryer 60 is reduced. In addition, it is necessary to remove water droplets, oil droplets, and the like with the line filter 100 and to remove mist such as water and oil with the mist filter 102. However, it is necessary to secure a space for installing the line filter 100 and the mist filter 102 in the vehicle, and it is also desired to omit such a space as much as possible.

[0005] For this reason, the inventors of the present invention have replaced the line filter 100 and the mist filter 102 shown in FIG. 9 with the oil / water removal of the compressed air shown in FIG. 10 proposed in Japanese Patent Publication No. 4-44169. I tried using the device. In this oil / water removing device, the compressed air is supplied to the inlet hole 11.
0 into the spiral passage 112 and the spiral passage 11
2 passes through the porous body 114 filled in the upstream part and exits into the hollow part 116 downstream of the spiral passage 112. The compressed air that has passed through the cavity 116 is inverted in the bottom chamber 118, passes through the filter 122 filled in the inner cylinder 120, and is discharged from the outlet 124. During this time, droplets such as water droplets and mist contained in the compressed air are liquefied while passing through the spiral passage 112 and flow down to the bottom chamber 118 together with the compressed air, from the drain hole 126 formed in the bottom chamber 118. Is discharged. Water mist and the like that have entered the inner cylinder 120 together with the compressed air are captured by the filter 122, and the compressed air from which the water mist and the like have been removed is discharged from the outlet hole 124.

[0006]

According to the apparatus for removing oil and moisture from compressed air shown in FIG. 10, the functions of the line filter 100 and the mist filter 102 shown in FIG. Can be miniaturized. However, when the compressed air from the compressor that is operated intermittently is supplied to the oil / water removing device for compressed air shown in FIG. 10, when the stopped compressor is restarted,
The moisture content of the compressed air discharged from the outlet hole 124 of the water removal device is likely to be higher than the compressed air discharged from the outlet hole 124 in a steady state, and contains a large amount of droplets and mist of water and oil. It has been found that it is difficult to cope with the case where the compressed air is supplied intermittently. Therefore, an object of the present invention is to provide a method for supplying compressed air containing a large amount of droplets and mist such as water and oil, such as when compressed air is supplied from a compressor that is operated intermittently. An object of the present invention is to provide an apparatus for removing oil and moisture from compressed air which can sufficiently cope with it and can be made as small as possible.

[0007]

The present inventors have studied to solve the above-mentioned problems, and as a result, have found that a first chamber for removing relatively large water droplets and the like contained in intermittently supplied compressed air is provided. The second chamber provided with a filter for removing water mist and the like in the compressed air from which water droplets and the like have been removed is separated by a partition wall having a fluid passage through which the compressed air can pass, and compressed into the first chamber. Outlet for draining drain water removed from the air outside the device
And pressure is applied to the partition between the first and second chambers by the second chamber.
A drain hole is provided to discharge drain water removed from compressed air.
When the compressed air is supplied to the first chamber,
By providing a closed discharge valve , the stopped compressor was restarted and compressed air was supplied to the first chamber.
When the pressure in the second chamber, which is lower than the pressure in the first chamber, passes through the discharge hole,
The compressed air discharged from the second chamber can be prevented from being bypassed, and the moisture content of the compressed air discharged from the second chamber is found to be substantially the same as the compressed air discharged in the steady state, and the present invention has been achieved. . That is, the present invention provides a second port provided with a supply port through which compressed air containing droplets and mist such as water and oil is supplied intermittently and a discharge port for discharging drain water removed from the compressed air. One chamber and a second chamber provided with a discharge port for discharging the compressed air from which the droplets and mist have been removed are adjacent to each other via a partition wall in which a fluid path through which the compressed air can pass is formed. An oil / water removing device for compressed air provided in the first chamber, wherein the compressed air supplied to the first chamber is changed in flow direction to be compressed into a fluid passage formed in the partition. A tubular body having one end fixed to the partition wall to guide air,
A mist filter that is provided in the second chamber and removes mist such as water or oil contained in compressed air that has passed through the fluid path of the partition; and a mist filter formed on the partition and removed by the mist filter. Drain water collected in the room is the first
A discharge hole for discharging into the chamber, and a compressed air provided in the discharge hole.
When the air is supplied to the first chamber, the discharge hole is closed.
When the supply of the compressed air to the first chamber is stopped,
Drain water collected in the second chamber at the discharge hole is discharged to the first chamber
And a discharge valve that forms a gap that forms the compressed air.

In the present invention, the partition wall is formed on the partition wall.
The discharge hole has a tapered discharge hole whose inner diameter increases toward the first chamber.
And a discharge valve provided in the discharge hole,
Conical or formed so as to be able to adhere to the tapered inner wall surface of the hole or
A frusto-conical valve element and extending into the second chamber from the top of the valve element
And a flange having a diameter larger than that of the opening of the discharge hole on the second chamber side.
By adopting a discharge valve composed of
During the operation of the oil / water removal device, the pressure is reduced through the discharge hole to the second chamber, which is lower than the pressure of the first chamber to which the compressed air is supplied .
Compressed air bypass can be easily prevented. Also, the first
By providing the compressed air supply port so that the compressed air is supplied from the tangential direction of the cylindrical body provided in the chamber, the compressed air supplied to the first chamber can be given a swirling motion. Water droplets in the air can be centrifuged. At this time,
The compressed air supplied to the first chamber is also formed by forming spiral wings on the outer wall surface of the cylindrical body for guiding the compressed air supplied from the supply port of the first chamber to the fluid path formed in the partition. Can be given a swirling motion. Further, a skirt for preventing the drain water accumulated in the first chamber from being wound up is attached to the other end of the cylindrical body for guiding the compressed air supplied from the supply port of the first chamber to the fluid path formed in the partition. By doing so, the amount of water accompanying the compressed air to the filter provided in the second chamber can be made as small as possible.

In the conventional apparatus for removing oil and moisture from compressed air shown in FIG. 10, when the stopped compressor is restarted, the reason why the moisture content of the compressed air discharged from the outlet hole 124 tends to increase is that the compressor Is that oil droplets, water droplets, and the like accumulated in the aftercooler 50 and the like during suspension are supplied to the oil / water removing device at a time by compressed air when the compressor is restarted. That is, when compressed air including a large amount of water droplets, oil droplets, and the like is intermittently supplied to the oil / water removing device, a large amount of water mist and the like together with the compressed air enter the filter 122 and are captured. However, filter 1
The outlet of the captured water is not provided in the inner cylinder 120 or the like in which the filter 22 is stored, and the captured water captured by the filter 122 is accumulated in the filter 122. Therefore, when the compressed air containing a large amount of water mist or the like is intermittently supplied to the filter 122 and the amount of trapped water stored in the filter 122 exceeds the amount that can be trapped in the filter 122, the outlet hole 124
Water mist accompanies the compressed air discharged from the compressor, and the moisture content of the compressed air tends to increase.

In this respect, in the present invention, the first chamber for removing relatively large oil droplets and water droplets contained in the compressed air and the water mist in the compressed air from which the water droplets and the like have been removed are removed. A second chamber provided with a mist filter was separated by a partition wall having a fluid passage through which compressed air could pass, and a discharge port was provided for discharging drain water removed from the compressed air to the outside of the device. The first chamber is provided in the partition with a discharge hole for discharging the drain water removed from the compressed air in the second chamber, so that the drain water in the second chamber is discharged to the first chamber. The amount of captured water that can be captured in the mist filter is not exceeded. For this reason, the stopped compressor is restarted, and the compressed air including a large amount of water droplets is intermittently supplied to the first chamber, so that a large amount of water mist and the like is generated in the mist filter of the second chamber along with the compressed air. Even if the compressed water is supplied in such a manner, the amount of captured water that can be captured in the mist filter does not exceed, so that the moisture content of the discharged compressed air can be made substantially the same as the compressed air discharged in the steady state. Further, a discharge hole provided in a partition wall between the first chamber and the second chamber.
When the compressed air is supplied to the first chamber, the discharge hole is closed.
When the supply of compressed air to the first chamber is stopped,
A gap for discharging drain water accumulated in the second chamber into the first chamber to the first chamber
A condensate valve that forms a
When the presser is restarted and compressed air is supplied to the first chamber
Pressure through the discharge port to the second chamber, which is lower in pressure than the first chamber.
Prevents compressed air bypass and shuts down the compressor
Drain water collected in the second chamber can be discharged to the first chamber
You.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the drawings. FIG. 1 shows the compressed air oil according to the present invention.
It is a longitudinal section showing an example of a moisture removal device. The oil / water removing device for compressed air in FIG. 1 includes a supply port 14 to which compressed air containing water droplets, oil droplets, and the like is supplied, and a discharge port 16 for discharging drain water removed from the compressed air. A second chamber B having a discharge port 18 for discharging compressed air from which water droplets, water mist and the like have been removed is provided on a first chamber A provided with a partition wall 22 in which a fluid passage 20 through which compressed air passes is formed. It is provided through. Further, in the first chamber A, one end of a cylindrical body 24 is fixed to the partition wall 22 so as to be substantially perpendicular to the supply port 14. A fluid passage 22 formed in the partition wall 22 is opened at an end surface of the cylindrical member 24 fixed to the partition wall 22, and the fluid path 22 is formed in the first chamber A from the supply port 14 in a direction perpendicular to the cylindrical body 24. The flow direction of the supplied compressed air is indicated by an arrow Y
The compressed air can be guided to the fluid path 20 formed in the partition wall 22 by changing as shown in FIG. Thus, the compressed air is
Drops such as water droplets and oil droplets in the compressed air can be removed by being supplied to the chamber A and rapidly decreasing the flow velocity and rapidly changing the flow direction of the compressed air.

In the second chamber B, a mist filter 24 screwed to the fluid passage 20 of the partition wall 22 is screwed, and mist such as water or oil in the compressed air passing through the fluid passage 20 is screwed. Is removed. As the mist filter 24, the one shown in FIG. 2 can be suitably used. In the mist filter 24, an auxiliary filter element 32 formed in a pleated shape for removing coarse dust is inserted into an inner peripheral surface of a cylinder 31 having a porous plate formed in a cylindrical shape. A porous auxiliary cylinder 33 having sufficient air permeability and rigidity is inserted into the surface. Further, the cylinder 31
Is provided with a main filter element 34 formed by winding a laminate of a nonwoven fabric 34a of fine glass fiber and a filter support 34b such as rayon cloth, and a synthetic resin is provided on the outer peripheral surface of the main filter element 34. An auxiliary outer cylinder 38 made of foam is extrapolated. When compressed air is supplied to the inside of the porous auxiliary cylinder 33 of the mist filter 24, the compressed air is supplied to the auxiliary filter element 3
2, while passing through the cylinder 31 and the main filter element 34, liquid mist such as dust and water mist contained in the compressed air is captured. The captured liquid mist is liquefied and pushed out to the auxiliary outer cylinder 38 by air pressure, and flows down the auxiliary outer cylinder 38 to the surface of the partition wall 22. On the other hand, the compressed air from which water mist and the like have been removed by the mist filter 24 is
The film-type gas dryer 6 is discharged from the discharge port 18 to the outside of the apparatus.
0 and so on.

The partition 22 is provided with a discharge valve 26 in a tapered discharge hole 27 whose inner diameter increases toward the first chamber A side. The discharge valve 26 has a frusto-conical valve body 28 formed so as to be in close contact with the tapered inner wall surface of the discharge hole 27, and an extension portion extending from the top of the valve body 28 into the second chamber B. Flange portion 2 having a diameter larger than the opening of discharge hole 27 on the second chamber B side.
9. The flange portion 29 is a stopper that prevents the valve body 28 from falling into the first chamber A. By the way, when the compressed air is supplied to the first chamber A, the pressure of the first chamber A is higher than that of the second chamber B due to the pressure loss of the compressed air or the like. Is the discharge hole 2
7, the discharge hole 27 is closed by the discharge valve 26, and the first chamber A and the second chamber B are separated from each other. For this reason, the bypass of the compressed air from the first chamber A to the second chamber B can be prevented. However, while the compressed air is being supplied to the first chamber A, the drain water flowing down from the mist filter 24 is stored on the partition wall 22. For this reason, the partition 22
The distance H between the mist filter 24 and the surface
It is preferable to make adjustment so that the capacity is such that the drain water captured by the mist filter 24 during the time of supply to the chamber A can be stored. On the other hand, when the compressor is stopped, the pressure in the first chamber A and the pressure in the second chamber B become equal, so that the valve body 28 descends by its own weight, and the slope between the valve body 28 and the tapered inner wall surface of the discharge hole 27 is formed. There is a gap between them. For this reason, the drain water stored on the partition wall 22 flows down to the first chamber A. Here, by the outlet provided in the casing of the second chamber B,
It is not preferable to directly discharge the drain water stored on the partition wall 22 to the outside of the apparatus because the sealing structure of the discharge port becomes complicated and the entire apparatus becomes complicated. In FIG. 1, the shape of the valve body 28 is a truncated cone, but may be a cone.

At the bottom of the first chamber A, drain water such as water or oil removed from the compressed air supplied from the supply port 14 accumulates and is discharged from the discharge hole 16 to the outside of the apparatus. The discharge hole portion 16 can be in close contact with the tapered inner wall surface of the discharge hole 40 at the tapered discharge hole 40 formed at the bottom of the casing forming the first chamber A and having an inner diameter expanding toward the first chamber A. Is provided with a frusto-conical valve element 42 formed in the above. In the valve body 42, a flange portion 44 having a larger diameter than the opening of the discharge hole 40 on the outer wall surface side of the casing is provided in an extension portion extending from the top of the valve body 40 to the outside of the casing. The flange portion 44 is urged by an urging member 46 such as a spring in a direction in which a gap is formed between the slope of the valve body 42 and the tapered inner wall surface of the discharge hole 40. When the compressed air is supplied from the supply port 14 to the first chamber A, the discharge hole 16 presses the valve body 42 against the reaction force of the urging member 46 by the pressure of the compressed air. The slope and the tapered inner wall surface of the discharge hole 40 are in close contact with each other, thereby preventing the compressed air from leaking from the discharge hole 40. On the other hand, when the supply of the compressed air stops and the pressure in the first chamber A drops, the urging member 4
Due to the biasing force of 6, a gap is formed between the inclined surface of the valve body 42 and the tapered inner wall surface of the discharge hole 40, and the drain water stored in the first chamber A can be discharged to the outside of the device.

As shown in FIG. 3, the supply port 14 provided in the first chamber A of the apparatus for removing oil and moisture of compressed air shown in FIG.
The supplied compressed air may be provided at a position where the compressed air is substantially bisected around the cylindrical body 24, or may be provided at a position where the compressed air is supplied in a tangential direction of the cylindrical body 24 as shown in FIG. Good. Since the compressed gas supplied in the tangential direction of the cylindrical body 24 makes a revolving motion, droplets such as water droplets and oil droplets in the compressed air can be centrifuged to improve the removal efficiency. Furthermore, on the bottom of the first chamber A,
While the compressed air is supplied, drain water is stored. For this reason, when the flow direction of the compressed air is changed, the skirt portion 52 may be protruded at the lower end portion of the tubular body 24 as shown in FIG. preferable.

Further, as shown in FIG. 4, even if the supply port 14 is not provided at a position where compressed air is supplied in the tangential direction of the cylindrical body 24, as shown in FIG. Forming the spiral blades 54 on the surface can also impart a swirling motion to the supplied compressed air. As shown in FIG. 6, the tip of the spiral blade portion 54 does not have to be in contact with the inner wall surface of the first chamber A, as shown in FIG. It may be in contact. Further, the spiral blade portion 54 may be provided on the outer peripheral surface of the tubular body 24 only once as shown in FIG. As shown in FIG. 4, even when the supply port 14 is provided at a position where the compressed air is supplied in the tangential direction of the tubular body 24, the spiral blade portion 54 has the same shape as that of the tubular body 24. Of course, it may be provided on the outer peripheral surface. In this case, the inclination direction of the cylindrical body 24 provided along the outer peripheral surface may be reversed halfway.

In the apparatus for removing oil and moisture of compressed air shown in FIGS. 1 to 8 described above, the valve 42 is used as a constituent member of the discharge port 16 provided at the bottom of the first chamber A.
Is provided, but when the content of water droplets or the like in the compressed air supplied to the first chamber A is small, the biasing member 46 may be omitted. In this case, the valve element 4
It is necessary that the drain water accumulated in the first chamber A be periodically drained by pushing up the water 2 manually.

[0018]

According to the oil / water removing device of the present invention, when the compressor for supplying the compressed air is restarted, it can sufficiently cope with water droplets and the like accumulated in the piping being supplied at once with the compressed air. As a result, compressed air having substantially the same moisture content as that in the normal operation state of the compressor can be discharged from the discharge port.
For this reason, the oil / water removing device of the present invention is applied to a vehicle such as a railway vehicle or an automobile, in which compressed air used for operating a brake and opening / closing a door is compressed air supplied from a compressor that is operated intermittently. When dehumidifying with a dehumidifier such as a membrane gas dryer, the moisture content of the compressed air supplied to the dehumidifier can be kept within a certain range by installing it between the compressor and the dehumidifier. Performance can be exhibited.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view illustrating an example of a device for removing oil and moisture of compressed air of the present invention.

FIG. 2 is a longitudinal sectional view illustrating the structure of a mist filter 24 provided in the oil / water removing device shown in FIG.

FIG. 3 is a cross-sectional view illustrating an example of a position of a supply port 14 provided in a first chamber A.

FIG. 4 is a cross-sectional view for explaining another example of a position of a supply port 14 provided in a first chamber A.

FIG. 5 is a partial cross-sectional view showing a lower end structure of a tubular body 24 provided in a first chamber A.

FIG. 6 is a partial cross-sectional view showing an example of an outer peripheral surface structure of a tubular body 24 provided in a first chamber A.

FIG. 7 is a partial cross-sectional view showing another example of the outer peripheral surface structure of the tubular body 24 provided in the first chamber A.

FIG. 8 is a partial cross-sectional view showing another example of the outer peripheral surface structure of the tubular body 24 provided in the first chamber A.

FIG. 9 is a schematic diagram illustrating an example of a dehumidification circuit for dehumidifying compressed air.

FIG. 10 is a longitudinal sectional view showing a conventional oil / water removing device.

[Explanation of symbols]

 Reference Signs List A First chamber B Second chamber 14 Compressed air supply port 16 Discharge port 18 Discharge port 20 Fluid path 22 Partition wall 24 Mist filter 26 Discharge valve 27 Discharge hole 28 Valve element 29 Flange section 52 Skirt section 54 Spiral blade section

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-236808 (JP, A) JP-A-51-137173 (JP, A) Jikai 48-54367 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) B01D 46/24 B01D 50/00 502

Claims (5)

(57) [Claims] A first port provided with a supply port for intermittently supplying compressed air containing droplets and mist of water and oil, and a discharge port for discharging drain water removed from the compressed air.
A chamber and a second chamber provided with a discharge port for discharging the compressed air from which the droplets and mist have been removed are provided adjacent to each other via a partition formed with a fluid path through which the compressed air can pass. An oil / moisture removing device for compressed air, wherein the compressed air is provided in the first chamber, and the compressed air supplied to the first chamber is changed in flow direction to a fluid passage formed in the partition. And a mist that is provided in the second chamber and removes a mist of water, oil, or the like contained in the compressed air that has passed through the fluid path of the partition so as to guide the mist. a filter, formed in the partition wall, said a discharge hole for discharging the drain water to the first chamber accumulated in the second chamber is removed by the mist filter, provided in the discharge hole, supply compressed air to said first chamber Sa
When it is closed, the discharge hole is closed, and the compressed air to the first chamber is compressed.
When the supply of air is stopped, the gas is collected in the second chamber in the discharge hole.
Discharge valve for forming a gap for discharging the drain water drained into the first chamber
A device for removing oil and moisture from compressed air, comprising: 2. An exhaust hole formed in a partition wall is provided in a first chamber side.
A tapered discharge hole whose inner diameter is enlarged, wherein a discharge valve provided in the discharge hole has a taper of the discharge hole.
Conical or frustoconical shape formed to be able to adhere to the inner wall surface
A valve body, extending from the top of the valve body into the second chamber,
From the flange with a larger diameter than the second chamber side opening of the discharge hole
The compressed air oil according to claim 1, which is a discharge valve configured.
Water removal device. 3. A tangential direction of a cylindrical body provided in the first chamber.
The compressed air oil / water removing device according to claim 1 or 2 , wherein a compressed air supply port is provided so that the compressed air is supplied . 4. A compressed air supplied from a supply port of the first chamber.
Thread on the outer wall surface of the cylindrical body that guides the fluid to the fluid path formed in the partition.
The device for removing oil and moisture of compressed air according to any one of claims 1 to 3, wherein a spiral blade portion is formed . 5. The other end of a cylindrical body for guiding compressed air supplied from a supply port of a first chamber to a fluid path formed in a partition wall,
Skirt to prevent the drainage liquid accumulated in one chamber from winding up
5. The apparatus for removing oil and moisture from compressed air according to claim 1, wherein the projecting portion extends .