JP3326086B2 - Drain removal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a drain removing device, and more particularly to a drain removing device used in a compressed air supply system for intermittently supplying compressed air to a user such as a dehumidifier.

[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 dehumidifier comprising a desiccant filling tank filled with a desiccant such as silica gel. However, the conventional dehumidifying method of dehumidifying with a desiccant such as silica gel requires a large dehumidifier including a desiccant filling tank, so that a special installation space for the dehumidifier must be secured in the vehicle. It is necessary to change the agent frequently. For this reason, the present inventors have tried to use a membrane type air dryer proposed in JP-A-6-134244 or the like in a dehumidifier instead of the conventional dehumidifying method using a hygroscopic agent. This membrane air 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. 6 schematically shows a compressed air supply system for supplying compressed air to such a film type air dryer. In FIG. 6 , after the compressed air C discharged from the compressor is cooled by the aftercooler 50, droplets such as water droplets and oil droplets contained in the compressed air C are removed by the line filter unit 100, and The compressed air from which mist such as water mist contained in the compressed air that has passed through the filter unit 100 has been removed by the mist filter unit 102 is further supplied to the membrane air dryer 60. Thus, the compressed air supplied to the membrane air dryer 60 passes through the inside of the hollow fiber membrane 62 and is dried. The obtained dry compressed air is supplied to a user of the dry compressed air by a pipe 64, and a part of the dry compressed air is supplied by a return pipe 66 to the membrane air dryer 6.
It is returned to 0 as purge air. The returned purge air flows outside the hollow fiber membrane 62 and is discharged from the discharge port 68 to the outside of the membrane air dryer 60.

[0004]

According to the dehumidification circuit using the membrane air dryer 60 shown in FIG. 6 , the membrane air dryer 60 is small and does not use a moisture absorbent. Therefore, it is not necessary to secure a special space for installing the device and the like, and it is not necessary to replace the hygroscopic agent. By the way, in vehicles such as railway cars and automobiles,
Since the compressed air for operating the brake and opening and closing the door is used intermittently, 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 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 mist is supplied to the membrane air dryer 60, the performance of the membrane air dryer 60 is reduced. It is necessary that the filter unit 100 removes droplets such as water droplets and the mist such as water mist is removed by the mist filter unit 102.

For this reason, the line filter 100 to which compressed air discharged from the aftercooler 50 and containing a large amount of liquid droplets such as water droplets is first supplied automatically automatically receives a drain from which liquid droplets such as water droplets have been removed. Automatic drain valve 104 to discharge
Is provided. Therefore, the line filter unit 100
The liquid droplets such as water droplets removed by the automatic drain valve 104 are automatically discharged as drain from the automatic drain valve 104. On the other hand, in the mist filter section 102, since the purpose is to remove mist such as water in compressed air in principle, the amount of drain generated is small in the line filter section 100. For this reason, usually, the mist filter unit 102 is not provided with an automatic drain valve, but is provided with a drain extraction valve 106. Therefore, the mist filter unit 1 is periodically
It is necessary to manually open the drain extraction valve 106 provided at 02 to discharge the drain.

However, if the operation of extracting the drain collected in the mist filter unit 102 is manually performed,
When the drain accumulated in the mist filter unit 102 is not drawn out due to an operation error or the like, or when the line filter unit 100 cannot completely remove the droplets such as water droplets, the compression including a large amount of mist such as water mist is performed. When air is supplied to the mist filter unit 102, a large amount of drain is accumulated in the mist filter unit 102, which may cause a situation in which the drain flows into the membrane air dryer 60. Further, the mist filter unit 10 generated due to a large amount of drain accumulated in the mist filter unit 102 is formed.
2 may cause a situation in which compressed air containing mist such as water mist is supplied to the membrane air dryer 60 due to a drop in capacity or re-scattering of the drain. When such a situation is caused, the performance of the membrane air dryer 60 decreases,
The amount of dry compressed air used for operating the brakes of the vehicle and for opening and closing the doors tends to be insufficient, which may cause an accident. In order to avoid such a situation, it is conceivable to provide an automatic drain valve in the mist filter unit 102.
However, in general, when the amount of generated drain is small, the automatic drain valve has poor reliability in its operation. Therefore, compressed air supply for supplying dry compressed air for operating a vehicle brake or opening and closing a door is generally used. Cannot be used for systems. Therefore, an object of the present invention is to use a compressed air supply system for intermittently supplying compressed air to a user such as a dehumidifier, and to surely collect drain and mist accompanying the compressed air to generate a drain. An object of the present invention is to provide a drain removal device that can be removed.

[0007]

The inventors of the present invention have repeatedly studied to solve the above-mentioned problems, and found that the check valve 1 shown in FIG.
Pipe a provided with a valve 8 and a reverse feeder provided with a check valve 20
Line filter section 12 and mist communicating with pipe b
In the compressed air supply system, which is the main configuration with the filter unit 14, a line filter unit that generates a large amount of drain
Automatic drain valve 16 is provided on 12, by providing a backhaul pipe b of the drain from the mist filter unit 14 to the line filter unit 12, line filter unit 1
2 is automatically discharged, and the drain collected in the mist filter section 14 is removed from the line filter section 1.
It has been found that the liquid can be discharged from the automatic drain valve 16 by feeding back the pressure difference 2 to a pressure difference. However, with this configuration
If the drain removal device becomes large,
Turned out to be difficult. For this reason,
The present inventors have further studied and found that the line filter unit 1
2 and the mist filter unit 14 are integrally formed.
The degree to which the drain removal device can be easily stored in the vehicle
The present inventors have found that the size can be reduced, and reached the present invention.

That is, a first aspect of the present invention is a drain removal apparatus used in a compressed air supply system for intermittently supplying compressed air to a user such as a dehumidifier, and the compressed air is supplied to the drain remover. A line filter chamber for removing droplets such as water droplets in compressed air, and a mist filter chamber for removing mist such as water mist contained in compressed air supplied via the line filter chamber. And is provided in the line filter chamber,
When the supply of the compressed air is stopped, the valve automatically opens to discharge the drain accumulated in the line filter together with the compressed air, and the drain provided on the partition wall and accumulated in the mist filter chamber is lined. A back-flow path for back-feeding to the filter chamber, and a back-flow such as a check valve provided in the back-flow path and substantially preventing bypass of compressed air through the back-flow path from the line filter chamber to the mist filter chamber. A drain removal device comprising a prevention mechanism.

A second aspect of the present invention is a drain removal device used in a compressed air supply system for intermittently supplying compressed air compressed by a compressor or the like and cooled by an aftercooler to a user such as a dehumidifier. An automatic drain valve that is provided near the compressed air outlet of the aftercooler and that automatically opens when the supply of compressed air is stopped and discharges the drain accumulated in the aftercooler together with the compressed air. A line filter for removing droplets such as water droplets in the compressed air supplied to the drain removing device, and removing a mist such as water contained in the compressed air supplied via the line filter. The mist filter section and the drain collected in the line filter section and the mist filter section are sent back to the vicinity of the compressed air outlet of the aftercooler. A non-return valve provided in the middle of the feed pipe and the reverse feed pipe, and substantially preventing a bypass of the compressed air passing from the vicinity of the compressed air outlet of the aftercooler to the line filter part and the mist filter part through the reverse feed pipe; And a backflow prevention mechanism.

In the first and second aspects of the present invention, the automatic drain valve includes a valve body that opens and closes a drain discharge hole, and an urging member that urges the valve body in a direction in which the drain discharge hole is opened. And supplying the compressed air by using an automatic drain valve in which the urging force of the urging member is adjusted such that the drain discharge hole is closed by a valve body pressed by the air pressure of the supplied compressed air. The drain can be discharged out of the system while the air pressure of the compressed air supply system is automatically reduced while the operation is stopped.

According to the first aspect of the present invention, in the compressed air supply system to which the compressed air is intermittently supplied, the drain accumulated in the line filter chamber is automatically discharged from the automatic drain valve. Further, when the supply of the compressed air is temporarily stopped, the automatic drain valve provided in the line filter chamber is opened, and the internal pressure of the line filter chamber becomes lower than that of the mist filter chamber. For this reason, the drain accumulated in the mist filter chamber is back-fed to the line filter chamber via a reverse feed pipe or a reverse feed path by a differential pressure and discharged from the automatic drain valve. As described above, according to the drain removing device according to the first aspect of the present invention, the drain stored in each of the line filter chamber and the mist filter chamber can be automatically and reliably drained. Thus, it is possible to avoid a situation in which a large amount of drain is collected and flows into a user such as a dehumidifier, or a situation in which the performance of removing the droplets and mist of the drain remover itself is reduced. While the compressed air is being supplied to the compressed air supply system, the compression through the reverse piping or the reverse passage is performed by a reverse flow prevention mechanism such as a check valve provided in the reverse piping or the reverse passage. The air bypass is substantially prevented.

Further, according to the second aspect of the present invention, in the compressed air supply system to which the compressed air is intermittently supplied, the drain accumulated in the aftercooler is automatically discharged from the automatic drain valve. Further, when the supply of the compressed air is temporarily stopped, the automatic drain valve provided near the compressed air outlet of the aftercooler is opened, and the compressed air in the aftercooler is also discharged outside the system. The internal pressure is lower than that of the line filter and the mist filter. For this reason, the drain accumulated in the line filter part and the mist filter part is sent back to the vicinity of the compressed air outlet of the aftercooler by the differential pressure via the reverse feed pipe, and is discharged from the automatic drain valve. As described above, according to the drain removal device according to the second aspect of the present invention, the drain stored in each of the aftercooler, the line filter unit, and the mist filter unit can be automatically drained without fail. Thus, it is possible to avoid a situation in which a large amount of drain is collected and flows into a user such as a dehumidifier, or a situation in which the performance of removing the droplets and mist of the drain remover itself is reduced. In addition, the size of the line filter can be reduced.
You. While compressed air is being supplied to the compressed air supply system, a backflow prevention mechanism such as a check valve provided in the reverse feed pipe substantially prevents the compressed air from bypassing through the reverse feed pipe. are doing.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG . 1 shows a first embodiment of the present invention.
This is an example of a drain removal device, which is inside the drain removal device.
It is explanatory drawing which shows a structure. Drain removal device 1 shown in FIG.
0 denotes a line filter chamber A in which a droplet filter 24 for removing droplets such as water droplets in the compressed air supplied to the line filter chamber A and a compressed air supplied through the line filter chamber A are provided. A mist filter chamber B in which a mist filter 39 for removing a mist such as water mist contained is integrated via a partition wall 43. Do
The ren removal device 10 is provided with the compressed air supplied from the inlet 37.
With the droplet filter 24 and the mist filter 39.
To remove compressed water from the outlet 41 to the user of the compressed air equipment.
Has the function of supplying.

The line filter chamber A contains a filter for droplets.
24 and a self-installing device provided at the bottom of the line filter chamber A.
And a dynamic drain valve 16. Near the bottom of the partition 43
A valve body 47 communicating with the mist filter chamber B is provided beside
Have been.

The automatic drain valve 16 is open and valve body 30 to the valve 33 for opening and closing the drain discharge hole 34 and the other end diaphragm 28 is provided at one end is provided, the valve 33 is a drain discharge hole 34 And a spring 32 as an urging member that urges the valve element 30 in the direction in which the valve element 30 is driven. The area of the diaphragm 28 is formed to be larger than the area of the valve 33. The lower limit position of the valve 33 is regulated by the spring 35. In the automatic drain valve 16, the biasing direction in which the valve body 30 is biased by the spring 32 is opposite to the force applied to the diaphragm 28 by the internal pressure in the casing. For this reason, when the supply of the compressed air supplied from the inlet 37 is stopped, the internal pressure in the casing decreases, and when the force due to the internal pressure applied to the diaphragm 28 becomes equal to or less than the urging force of the spring 32, the valve 33 operates. The closed drain discharge hole 34 is opened. On the other hand, when the supply of the compressed air is started from the inlet 37 and the internal pressure in the casing rises and the force due to the internal pressure applied to the diaphragm 28 exceeds the urging force of the spring 32, the drain discharge hole 34 is opened by the valve 33. Is closed. In this way, after the drain discharge hole 34 is closed, the compressed air supplied to the inlet 37 of the line filter chamber A is subjected to removal of droplets such as water droplets by the droplet filter 24 and the like, and passes through the passage 42. Mist filter room B
Supplied to Droplets such as water droplets removed from the compressed air are collected as drain at the bottom of the casing, and when the internal pressure in the casing decreases and the valve 33 opens the drain discharge hole 34, the droplet is discharged together with the residual pressure in the casing. You.

The compressed air processed by the line filter chamber A passes through a passage 42 and is supplied to a mist filter.
It is supplied to the chamber B. The mist filter chamber B is connected to the passage 42
Mist filter 39 is mounted in the casing, and the compressed air supplied from the passage 42 is discharged from the outlet 41 after passing through the mist filter 39 to remove mist such as water mist. Is done. On the other hand, the mist, such as water mist which is removed by the mist filter chamber B flows down as droplets in the mist filter chamber B, is accumulated as a drain in the housing bottom. The drain is returned to the line filter chamber A together with the compressed air in the mist filter chamber B from the check valve 20 formed on the bottom of the casing, as described later.

Further, at the bottom of the line filter chamber A ,
With automatic drain valve 16 is provided, the partition walls 43
A check valve 20 is provided in the vicinity of the bottom. This check valve 20 is formed in a partition wall 43 near the bottom, and has a tapered reverse feed passage 45 whose diameter increases toward the line filter chamber A.
The taper portion 48 of the valve element 47 urged toward the line filter chamber A by a spring 46 as an urging member is inserted into the valve body 47. Since the tapered portion 48 of the valve element 47 also has a tapered shape whose diameter increases toward the line filter chamber A, when the pressure of the line filter chamber A is larger than the urging force of the spring 46, the reverse feed passage 45 and the tapered portion 48 are formed. The two tapered surfaces are in close contact with each other to isolate both portions. On the other hand, when the pressure in the line filter chamber A is smaller than the urging force of the spring 46, the valve body 47 is pushed toward the line filter chamber A by the spring 46, and between the tapered surfaces of the reverse feed passage 45 and the tapered portion 48. A gap is formed, and the drain collected on the mist filter chamber B side can flow into the line filter chamber A side. Particularly, as shown in FIG.
9, it is effective to collect the drain near the check valve 20. When some air leakage can be tolerated, the check valve 20 may be replaced with a small hole in the reverse feed passage 45 and the valve element 47 may be omitted as a simple substitute.

As shown in FIG. 1 , in addition to arranging the line filter chamber A and the mist filter chamber B in a horizontal direction, as shown in FIG. 2 , the line filter chamber A and the mist filter chamber B are vertically stacked. The drain removal device 10 may be used. The drain removal device shown in FIG. 2 has an inlet 37 to which compressed air containing droplets such as water droplets is supplied, and an automatic drain valve 16 for discharging drain removed from the compressed air. A mist filter chamber B having an outlet 41 for discharging compressed air from which mist such as water mist has been removed is provided in a fluid passage 5 through which compressed air passes.
1 is provided via a partition wall 43 formed with the same. Further, the line filter chamber A contains a droplet as a droplet separator.
A filter 24 is provided. This droplet filter 2
4 is a droplet holder so as to be substantially perpendicular to the inlet 37.
One end of the filter 24 is fixed to the partition wall 43.
The end face secured to the partition wall 43 of the droplet filter 24, the fluid passage 51 formed in the partition wall 43 are opened, liquid droplets from the inlet 37 to the line filter chamber A Fi
By changing the flow direction of the compressed air supplied in a direction perpendicular to the luter 24 as shown by the arrow Y, the compressed air can be guided to the fluid path 51 formed in the partition wall 43. As described above, the compressed air is supplied to the line filter chamber A, the flow velocity is rapidly reduced, and the flow direction of the compressed air is changed abruptly, thereby removing droplets such as water droplets in the compressed air. Can be.

In the mist filter chamber B, a mist filter 39 is screwed into the fluid passage 51 of the partition wall 43 to remove mist such as water mist in the compressed air passing through the fluid passage 51. . The compressed air from which water mist and the like have been removed by the mist filter 39 is discharged from the outlet 41 and supplied to the membrane dryer 60. On the partition wall 43,
A check valve 20 is provided. The check valve 20 is provided with a valve body 47 in a tapered reverse feed passage 45 whose inner diameter increases toward the line filter chamber A. This valve element 47
The mist filter chamber B is formed by a tapered portion 48 formed so as to be in close contact with the tapered surface of the reverse feed passage 45 and the tapered portion 48.
An extended portion that extends into the inside is formed of a flange portion 52 having a diameter larger than the opening of the reverse feed passage 45 on the mist filter chamber B side. The flange portion 52 is a stopper that prevents the valve body 47 from falling into the line filter chamber A.

When the compressed air is supplied to the line filter chamber A, the pressure of the line filter chamber A is higher than that of the mist filter chamber B due to the pressure loss of the compressed air. The tapered surface 48 is pressed against and tightly attached to the tapered surface of the reverse feed passage 45, so that the line filter chamber A and the mist filter chamber B are separated. Therefore, the bypass of the compressed air from the line filter chamber A to the mist filter chamber B can be prevented. However, while the compressed air is being supplied to the line filter chamber A, the drain flowing down from the mist filter 39 is stored on the partition wall 43. For this reason, the distance between the surface of the partition wall 43 and the mist filter 39 is set to a capacity capable of storing the drain collected by the mist filter 39 during the time when the compressed air is supplied to the line filter chamber A. Adjustment is preferred. On the other hand, when the compressor is stopped, the line filter chamber A and the mist filter chamber B
And the valve element 48 descends under its own weight to form a gap between the tapered portion 48 and the two tapered surfaces of the reverse feed passage 45, and the drain accumulated on the partition wall 43 is removed by the line filter chamber A. Flow down to If some air leakage can be tolerated, a simple substitute for the check valve 20 is used as the reverse feed passage 45.
May be a small hole, and the valve element 48 may be omitted.

An automatic drain valve 16 is provided at the bottom of the line filter chamber A, and automatically drains the drain removed from the compressed air supplied from the inlet 37 and accumulated at the bottom of the line filter chamber A. This automatic drain valve 1
Reference numeral 6 denotes a tapered drain discharge hole 34 whose inner diameter increases toward the line filter chamber A formed at the bottom of the casing forming the line filter chamber A so as to be in close contact with the tapered surface of the drain discharge hole 34. The valve body 30 including the valve 52 having a tapered surface is inserted.
The valve body 30 is provided with a flange 53 having a larger diameter than the opening of the drain discharge hole 34 on the outer wall surface side of the casing at the extension extending from the valve 52 to the outside of the casing.
The flange portion 53 is urged by a spring 35 as an urging member in a direction in which a gap is formed between the valve 52 and the tapered surfaces of the drain discharge holes 40. When the compressed air is supplied from the inlet 37 to the line filter chamber A, the valve 52 is pressed against the reaction force of the spring 35 by the pressure of the compressed air. Both tapered surfaces are in close contact, and the compressed air drain hole 3
4 is prevented from leaking. On the other hand, when the supply of the compressed air stops and the pressure in the line filter chamber A drops,
By the urging force of the spring 35, the valve 52 and the drain discharge hole 34
A gap is created between both tapered surfaces of the line filter chamber A
The drain accumulated in the tank can be discharged out of the apparatus. The automatic drain valve 16 may be of another type that is currently used as an automatic drain valve.

[0022]FIG. 3 shows an inlet provided in the line filter chamber.
It is explanatory drawing which shows the position of a mouth.Figure2Drain removal equipment shown
The inlet 37 provided in the line filter chamber A of FIG.
3As shown in (a), the supplied compressed air isDroplet fill
Tar 24May be provided at a position approximately bisected around
3As shown in (b),Droplet filter 24Tangential to
It may be provided at a position where compressed air is supplied.Droplet fill
Tar 24The compressed gas supplied in the tangential direction of
Liquid droplets such as water droplets in compressed air can be removed by centrifugation
Efficiency can be improved.Fig. 4 shows the lower end structure of the droplet filter.
FIG. Line filterOn the bottom of room A,
While the compressed air is supplied, the drain is stored. this
Therefore, when the flow direction of the compressed air changes,
Figure to prevent the drain4Shown in (a)
LikeDroplet filter 24Skirt 54 at the lower end
Overhang is preferred. Also figure3As shown in (b)
ToDroplet filter 24Compressed air is supplied tangentially to
Even if the entrance 37 is not provided at the position4Shown in (b)
As,Droplet filter 24Spiral wings 55 on the outer peripheral surface of
Also swirls into the supplied compressed air by forming
Exercise can be given. Such a spiral blade portion 55
Is the tip4As shown in (b), line fill
It does not have to be in contact with the inner wall surface of the4
(C) As shown in FIG.
You may be in contact. Further, the spiral blade portion 55 is4
As shown in (d),Droplet filter 24Around the outer circumference of
May be provided only.

FIG. 1 and drain discharge device 10 the line filter chamber A and a mist filter chamber B is constructed integrally 2 is used by being incorporated in a compressed air supply system shown in FIG. That is, after the compressed air C discharged from the intermittently operated compressor is cooled by the after cooler 50, the drain d is removed from the drain d.
The compressed air from which the droplets such as water and the mist are removed by the drain removal device 10 is supplied to the membrane air dryer 60 from the pipe e. In such a compressed air supply system, when the compressor is temporarily stopped, the purge air is discharged from the discharge port 68 of the membrane air dryer 60 even when the compressor is stopped, so that the internal pressure of the drain removal device 10 gradually decreases. For this reason, when the internal pressure of the line filter chamber A falls below a predetermined pressure, the drain discharge hole 3 closed by the valve 33 of the automatic drain valve 16
4 is opened, and the drain and residual pressure accumulated in the line filter chamber A are discharged from the drain discharge hole 34.

In FIGS. 1 and 2 described above, the automatic drain valve 16 is provided in the line filter section 12 or the line filter chamber, but as shown in FIG. 5 , separation of water droplets or the like in the compressed air is performed. The automatic drain valve 16 may be provided in the manifold near the compressed air outlet of the aftercooler 70 in order to further improve the pressure. In this case, an automatic drain valve is provided in the line filter unit 12 by providing a return pipe b for returning the drain accumulated in the line filter unit 12 and the mist filter unit 14 to the manifold near the compressed air outlet of the aftercooler 70. You don't have to. The aftercooler 70 shown in FIG. 5 has a header 7 in which both ends of each cooling pipe are divided into a plurality of manifolds.
1, 72. Therefore, the compressed air C compressed by the compressor and supplied to the manifold 71a
Is supplied to the line filter unit 12 while passing through the manifold 72a, the manifold 71b, and the manifold 72b while being cooled by the cooling pipe. At this time, droplets such as water droplets in the compressed air generated in the aftercooler 70 are pushed out by the compressed air and stored as a drain in the manifold 72b. When the supply of compressed air from the compressor is stopped, the drain
To line filter unit 12 and mist filter unit 1
Since the compressed air is discharged to the outside of the system together with the drain from the compressor 4, the compressed air with few water droplets can be supplied to the line filter unit 12 when the supply of the compressed air is restarted to the aftercooler 70.

[0025] also Figure 5 smell, line filter unit 12
And the mist filter section 14 are connected in series by a pipe a provided with a check valve 18 on the way. to this
The internal pressure of the mist filter unit 14 is higher than the line filter
It becomes higher than the part 12. Therefore, the mist filter section
Drain collected in 14 is fed back through drain hole 42
b is sent to the line filter unit 12 via
It can be discharged out of the system from the dynamic drain valve 16. Further, a connecting pipe for connecting the reverse feed pipe b to each bottom of the line filter 12 and the mist filter section 14 includes a reverse feed pipe b from the manifold 72b of the aftercooler 70 to the line filter section 12 and the mist filter section 14.
Are also provided with check valves 20a and 20b. This
When the compressor restarts, the line filter
12 is increased by the supply of compressed air, and the automatic drain
The drain discharge hole 34 is closed by the valve 33 of the
In addition, it is necessary to connect
Of compressed air passing through the return pipe b to the filter section 14
To prevent bypass, derived via a line filter 12
The compressed air that has passed through the pipe a
Supplied to Note that manual valves 22a and 22b are provided in case the check valves 20a and 20b fail.

The drain removal apparatus described above is used in a compressed air supply system for supplying compressed air to a membrane air dryer, but can also be used in a refrigeration air dryer. However, if the compressed air in the compressed air supply system does not escape when the compressor is temporarily stopped, as in a refrigeration air dryer, the automatic drain valve should be forcibly activated when the compressor is temporarily stopped. It is preferable to control. When the supply of compressed air from the compressor or the like is resumed, the check valve 20 or the check valves 20a and 20b provided on the check valve
When a small amount of compressed air that bypasses the hole can be tolerated, an orifice plate having a small hole may be used instead.

[0027]

According to the present invention, the drain can be reliably discharged from the compressed air supply system which supplies the user such as the dehumidifier, and the performance of the user such as the dehumidifier due to the inflow of the drain is reduced. Can be avoided. For this reason, the reliability of the compressed air supply system used for the vehicle and the like can be improved.

[Brief description of the drawings]

FIG. 1 shows the internal structure of a drain removal device according to the present invention .
FIG.

FIG. 2 shows another embodiment of the drain removing device according to the present invention .
FIG.

FIG. 3 is provided in a line filter chamber A of a drain removal device .
It is an explanatory view showing the position of the entrance 37.

FIG. 4 is provided in the line filter chamber A of the drain removal device .
Description view showing the lower end structure of a droplet filter 24 which is
You.

FIG. 5 shows another configuration example of the drain removal device according to the present invention .
FIG.

FIG. 6 shows a compressed air supply for supplying compressed air to an air dryer.
It is a schematic explanatory drawing which shows an example of a supply system.

FIG. 7 is a compressed air supply for supplying compressed air to an air dryer;
It is a schematic explanatory drawing which shows an example of a supply system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Drain removal apparatus 12 Line filter part 14 Mist filter part 16 Automatic drain valve 20 Check valve (backflow prevention mechanism) 24 Droplet filter 39 Mist filter 43 Partition wall 45 Reverse feed path 47 Valve body 70 Aftercooler a Reverse feed Piping A Line filter room B Mist filter room

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 1-114025 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B01D 46/00 B01D 50/00 501 B01D 50 / 00 502

Claims (3)

(57) [Claims] 1. Intermittently supplying compressed air to a user such as a dehumidifier.
Removal equipment used in the compressed air supply system for supplying air
A is, liquid water droplets in the compressed air supplied to the drain remover
A line filter chamber for removing droplets and the line filter
Water contained in the compressed air supplied through the
Mist filter chamber for removing mist such as strike
Integrated through a wall and provided in the line filter chamber to supply compressed air.
When supply is stopped, the valve opens automatically and the line filter
-Automatically discharges the drain collected in the
A drain valve, which is provided on the partition wall and accumulates in the mist filter chamber.
A reverse feed passage for returning the drain to the line filter chamber, and an
Of compressed air via the return passage to the filter chamber
A check valve such as a check valve to substantially prevent the passage.
A drain removal device, comprising: 2. A compressor which is compressed by a compressor or the like.
A user such as a dehumidifier uses compressed air cooled by the tar cooler.
Used in the compressed air supply system that supplies air intermittently
A removal device, which is provided near a compressed air outlet of the aftercooler , and
When the air supply stops, the valve automatically opens and
-Discharge the drain accumulated in the cooler together with the compressed air
Automatic drain valve, and water droplets in compressed air supplied to the drain removal device.
A line filter section for removing droplets, and compressed air supplied via the line filter section
Mist filter to remove mist such as water contained in
Section, and the reservoir in the line filter section and the mist filter section.
The collected drain is near the compressed air outlet of the aftercooler.
A reverse feed pipe that feeds back to the side, and provided in the middle of the reverse feed pipe to compress the aftercooler.
Line filter section and mist filter from near air outlet
Compressed air is bypassed via a return pipe to the
A check valve such as a check valve for qualitatively preventing
And a drain removal device. 3. An automatic drain valve opens and closes a drain discharge hole.
And a valve element in a direction in which the drain discharge hole is opened.
And a biasing member for biasing the compressed air supplied.
Drain discharge hole is closed by valve body pressed by air pressure
So that the biasing force of the biasing member is adjusted.
The drain removal device according to claim 1 or 2, wherein