JPH1163388A - Automatic drainage system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic drainage system excellent in durability, having poppet type and diaphragm type valve elements. SOLUTION: A float 23 vertically moved by drain is accommodated in a container 10, and a gas feed path 24 is opened/closed by a pilot valve 25 actuated by the float 23. A valve stem 34 is provided below a float chamber 12 so as to be horizontally movable. This valve stem 34 is provided with a poppet valve 36 for opening/closing a drainage path 38. An opening pressure chamber 45 communicated with the gas feed path 24 is formed by a closing diaphragm 41 provided at the valve stem 34, and a large diameter diaphragm 43 larger in diameter than the closing diaphragm 41. A closing pressure chamber 46 is formed by a small diameter diaphragm 44 smaller in diameter than the large diameter diaphragm 43.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic drainage device provided between a pneumatic device and a pneumatic source for draining water contained in compressed air supplied to the pneumatic device.

[0002]

2. Description of the Related Art When supplying compressed air stored in a pneumatic tank from a compressor to various pneumatic actuators such as a pneumatic cylinder via a pipe, an air tank as a compressed air source is required. A filter, a regulator, and a lubricator are incorporated in piping for connecting to a pneumatic device.

[0003] The filter is for removing water mixed in the compressed air, that is, drain and dust, and for supplying clean air to the pneumatic device. The regulator is used for supplying the compressed air supplied from the pneumatic supply source to the pneumatic device. The lubricator is for adjusting the pressure of the air, and the lubricator is for supplying the lubricating oil to the pneumatic operating device by mixing the lubricating oil in a mist state into the compressed air supplied to the pneumatic operating device. A combination of the above-described pneumatic devices such as a filter is generally called a pneumatic conditioning unit or a FRL unit.

[0004] The filter usually has a container or case in which the filter element is incorporated, and water droplets contained in the air are stored at the bottom of the case. An automatic drainage device, that is, an automatic drain, is provided in the filter for automatically discharging the drain in the case to the outside when a predetermined amount of water droplets or drain has accumulated in the case. As the auto drain, there is a float type, and the discharge valve is indirectly opened and closed by the buoyancy of the float. In some cases, an automatic drainage device, that is, an automatic drainage device is provided at the bottom of a container having a predetermined drain storage space without incorporating a filter. As such an auto drain, for example, there is one described in P512 of "New Edition Hydraulic Pneumatic Handbook" (issued on February 13, 1989) issued by Ohm Co., Ltd.

[0005]

In an automatic drain, that is, an automatic drainage device, which has been developed so far, a main valve for drainage is constituted by a sliding piston, and lubricating oil is supplied to a sliding portion. The operation may not be smooth depending on the attached state, and if foreign matter is caught in the sliding portion, the durability may be impaired.

In the automatic drainage device, the valve can be opened and closed by manual operation, and the piston is operated up and down. The piston is moved by the screw by rotating the drain cock.
For this reason, unless the drain cock is rotated a plurality of times, the valve cannot be manually opened and closed, and the operability is poor.

An object of the present invention is to provide an automatic drainage device having a poppet type and a diaphragm type valve element and having excellent durability and reliability.

The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0009]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows.

That is, an automatic drainage device according to the present invention comprises a container having a float chamber in which a primary side pipe and a secondary side pipe are connected and in which a float which moves up and down by a drain is housed, and which is opened and closed by the float. A pilot valve that opens and closes a gas supply passage, a poppet valve that is provided on a horizontally movable valve shaft below the float chamber, and opens and closes a drain passage that discharges a drain in the float chamber to the outside; An opening pressure chamber formed by a closing diaphragm provided on a shaft and a large-diameter diaphragm having a larger diameter than the closing diaphragm and communicating with the gas supply path to urge the poppet valve in an opening direction; A closing pressure formed on a shaft and communicating with the float chamber by a small-diameter diaphragm having a smaller diameter than the large-diameter diaphragm and biasing the poppet valve in a closing direction. Characterized in that it has and.

In the present invention, the main valve for opening and closing the drainage passage for discharging the drain in the container is formed by a poppet valve, and the pilot valve portion is also formed by a diaphragm, and has a sliding portion. Since the poppet valve is not sealed, the poppet valve is improved in sealability, foreign matter is prevented from being caught, and a reliable and smooth operation can be performed, so that drainage can be reliably performed.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 to 3 show an automatic drainage device according to an embodiment of the present invention. A case for accommodating a drain, that is, a container 10 has an open upper end and is provided in the container 10. A float chamber 12 is formed above the partition 11 and a drainage control chamber 13 is formed below the partition. Container 10
A port block 14 is detachably attached to an upper end of the port block. An inflow port 15 to which a primary pipe 15a is connected and a secondary pipe 16a are connected to the port block 14. Outflow port 16 is formed.

The port block 14 is provided with a louver 17, also called a deflector, located at the opening of the container 10. The air flowing into the container 10 from the primary pipe 15a through the inflow port 15 is supplied to the port block 14. The forcible swirl causes a rotating airflow along the inner wall of the container 10, whereby relatively large water droplets, oil droplets, and solid foreign matter having a large specific gravity in the inflowing air are centrifuged.

A cylindrical filter element 18 made of a sintered metal or the like is attached to the port block 14, and the air from which most foreign matter has been removed through the louver 17 is left by the filter element 18. After the foreign matter is removed, the foreign matter flows through the outflow port 16 toward the secondary pipe 16a.

A baffle 19 is attached to the port block 14 in order to prevent the drain accumulated in the float chamber 12 from being taken up by the air flow and mixed into the air flow.

A control case 21 having a rectangular outer peripheral surface is incorporated in a drain control chamber 13 provided at a lower end portion of the container 10, and the control case 21 has a support projecting into the float chamber 12. Rod part 21a and control case 2
1 are provided integrally with the partition 21b.
The control case 21 is inserted through an opening formed at the lower end of the container 10.
Will be closed.

A support rod 21a is provided in the float chamber 12.
, And a pilot valve 25 for opening and closing a gas supply passage 24 formed in the support rod 21a is provided at an upper end of the support rod 21a. One end of an operating rod 27 is connected to a connecting bracket 26 attached to the float 23 in order to open and close the pilot valve 25 as the float 23 moves up and down, and the other end of the operating rod 27 is connected to a support rod. It is held by the portion 21 a and is engaged with the pilot valve 25.
Thereby, the gas supply path 24 is opened and closed by the pilot valve 25 by the vertical movement of the float 23.

A pressure control block 28 is disposed in the control case 21 on one side of the partition 21b, and a diaphragm support cylinder 29 is incorporated in the pressure control block 28. A drainage control block 31 is incorporated in the control case 21 on the other side of the partition 21b. The drainage control block 31 is provided with a stop ring 33 screwed into a screw hole 32 formed in the container 10. Has been concluded by

A valve shaft 34 is provided in the control case 21 so as to move in the horizontal direction and to move in the axial direction.
A poppet valve 36, that is, a main valve, is formed of an elastic body such as rubber so as to cover the disc portion 35 provided in the disc 4. The poppet valve 36 has a conical surface that comes into contact with a valve seat 31 a formed in the drain control block 31, and is connected to a bottom of the float chamber 12 through a communication hole 37 formed in the partition wall 11 on the upstream side. Drainage channel 38a,
The communication with the downstream drainage channel 38b and the communication cutoff are performed, and the drainage channel 38 formed by the upper and lower drainage channels 38a and 38b is opened and closed. As shown in FIG. 3, the lower drainage channel 38 b communicates with a drainage joint 39 provided to protrude from the bottom lid 22, and is separated from the container 10 by a hose or a tube connected to the drainage joint 39. Drain is discharged to the position. In addition, the communication hole 3
7 is a mesh-shaped strainer 40 made of a wire mesh or the like to prevent dust and foreign matter from entering the drainage channel 38a.
May be set.

A closing diaphragm 41 integrally formed with the poppet valve 36 is provided on the valve shaft 34. An outer peripheral portion of the closing diaphragm 41 is fixed to the drainage control block 31, and the poppet valve 36 and the closing diaphragm are connected to each other. The drainage chamber 30 communicating with the upper drainage channel 38 a is formed between the diaphragm 41. When the poppet valve 36 closes the drainage channel 38, the upstream drainage channel 38 a is closed by the closing diaphragm 41.

The valve shaft 34 is provided with a stepped disk portion 42. An elastic body such as rubber is attached to the outside of the valve shaft 34, so that a large diameter diaphragm 43 having a larger diameter than the closing diaphragm 41 and a smaller diameter than this. Small diameter diaphragm 4
4 are formed. Each diaphragm 43,
The outer periphery of 44 is fixed to the diaphragm support cylinder 29.

The closing diaphragm 41 and the large-diameter diaphragm 43 form the opening pressure chamber 4 in the control case 21.
5 is formed, and the opening pressure chamber 45 is
It communicates with the gas supply path 24 formed in 1a. When the pilot valve 25 is opened and compressed air is supplied into the opening pressure chamber 45, the large diameter diaphragm 43 has a larger diameter than the closing diaphragm 41, so that the poppet valve 36 is opened to the valve shaft 34. Pressure is urged.

A pressure chamber for closing 46 is formed between the small diameter diaphragm 44 and the pressure control block 28, and the pressure chamber for closing 46 communicates with the float chamber 12 through a flow path 47. ing. Therefore, the pressure in the closing direction of the poppet valve 36 is applied to the valve shaft 34 by the pressure supplied into the closing pressure chamber 46. The flow path 47 may be communicated with the bottom of the float chamber 12 as shown in the drawing. As shown by a two-dot chain line in FIG. Float 2 in float chamber 12
By forming a flow path 47a communicating above 3
The drain may be prevented from entering the closing pressure chamber 46.

In the opening pressure chamber 45, a coil spring 51 for urging a spring force in a direction to open the poppet valve 36 with respect to the valve shaft 34 is incorporated, and compressed air is not supplied into the container 10. In this state, the poppet valve 36 is opened by the spring force of the spring 51 to form a normally-open automatic drainage device. On the other hand, as shown by a two-dot chain line in FIG. 2, when the coil spring 51a is incorporated in the closing pressure chamber 46, in a state where compressed air is not supplied into the container 10,
The poppet valve 36 is closed by the spring force of the spring 51a to provide a normally closed automatic drainage device.

An atmospheric pressure introducing chamber 52 is formed between the large diameter diaphragm 43 and the small diameter diaphragm 44.
The atmospheric pressure introduction chamber 52 is communicated with the outside through a bleed hole 53. The opening pressure chamber 45 communicates with the lower drainage channel 38b through the orifice 54. After the drain in the float chamber 12 is discharged to the outside, the opening pressure chamber 45 is in the opening pressure chamber 45 through the orifice 54. Is to be returned to atmospheric pressure.

The valve shaft 34 is composed of a portion 34a having a disk portion 35 and a portion 34b having a stepped disk portion 42 for convenience of manufacture and assembly. Thus, one continuous valve shaft 34 is configured. One end 56 of the valve shaft 34 projects outside from the end face of the drain control block 31, and this portion 56 is a manual operation unit, that is, a manual operation unit. Therefore, the poppet valve 36 can be opened manually by the operator pressing this portion. Thus, the valve shaft 34 is
3 has a horizontal direction that is perpendicular to the up-down direction. By exposing its outer end, the exposed part can be used as a manual operation part. The valve shaft 34 can be operated.

Except for the manual operation unit 56, the valve shaft 34 does not receive any operating resistance from the poppet valve 36 and the other diaphragms 41, 43, 44 when the valves are opened and closed. Since the pressure of the drain in 38b is low, the sliding resistance in the manual operation unit 56 can be reduced, so that the operating resistance of the valve shaft 34 when the valve shaft 34 opens and closes can be reduced, and The operation of the valve shaft 34 can be smoothly performed by the pressure or the spring force.

FIG. 4 shows a modification of the manual operation unit 56. In this case, the manual operation unit 56 is separated from the valve shaft 34,
No sliding resistance is applied to the valve shaft 34. By doing so, the operation of the valve shaft 34 can be further smoothed. A spring force is applied to the manual operation portion 56 by a spring member 57 in a direction in which the manual operation portion 56 projects.

FIG. 5 is a view showing an automatic drainage device provided with a quick joint as a modified example of the drainage joint 39. A base 61 attached to the bottom of the container 10 has a joint body 62.
Is fixed, and a lock claw 63 is incorporated in the distal end portion of the joint main body 62. The flexible tube 64 fitted to the joint body 62 is formed of a synthetic resin such as nylon or urethane. The flexible tube 64 is fastened by the lock claws 63 by being pushed into the joint body 62. In order to release the fastening by the lock claw 63, an opening sleeve 65 is fitted in the distal end portion of the joint body 62. By using this drainage joint 39,
The attachment and detachment of the flexible tube 64 can be performed quickly.

Next, the operation of the above automatic drainage device will be described. First, when air is not supplied from the primary pipe 15a into the container 10, the spring force of the spring 51 is applied to the valve shaft 34. 1 and FIG. 2, that is, the poppet valve 36 is connected to the valve seat 31.
The drainage path 38 is opened by moving in the direction away from a, and the drainage chamber 30 communicates with the drainage path 38b. Therefore, if the drain has accumulated in the float chamber 12 of the container 10 before this, the drain is discharged to the outside from the drainage joint 39. If the spring 51a is provided in the closing pressure chamber 46 without providing the spring 51 in the opening pressure chamber 45, a normally closed type is provided, contrary to the above.

Next, in the case where compressed air is discharged from the primary pipe 15a to the secondary pipe 16a via the container 10, no drain is present in the float chamber 12 or the drain is not more than a predetermined value. , The float 23 is lowered and the pilot valve 25 closes the gas supply passage 24.

At this time, the float chamber 1 of the container 10
Assuming that the pressure in 2 is P, the pressure acts on the drainage chamber 30 and the closing pressure chamber 46. The effective pressure receiving area of the pressure acts on the closed diaphragm 41 and S _A,
The effective pressure receiving area acting on the small-diameter diaphragm 44 is represented by S _C , the effective pressure receiving area of the poppet valve 36 is represented by S _D , and the spring 5
Assuming that the spring force by F is 1, the force applied to the valve shaft 34 in the direction of closing the poppet valve 36 is P · S _D + P
S _C = P (S _D + S _C ) On the other hand, poppet valve 3
The force in the direction to open 6 is P · S _A + F.

Therefore, P (S _D + S _C −S _A )> F
Then, the poppet valve 36 closes the drain passage 38, and by setting the effective pressure receiving area of the small-diameter diaphragm 44 to be sufficiently larger than that of the closing diaphragm 41, the compressed air supplied into the container 10 is set. , The poppet valve, that is, the main valve 36 is closed.

Next, when a drain having a predetermined value or more is stored in the float chamber 12 and the pilot valve 25 opens the gas supply passage 24 by the upward movement of the float 23, the pressure in the container 10 is also applied to the opening pressure chamber 45. Will be supplied.
When the effective pressure receiving area of the large diameter diaphragm 43 is S _B ,
The force in the direction to close the poppet valve 36 is P · S _D + P · S
_A + P · S _C = P (S _D + S _A + S _C ).

On the other hand, the force in the direction of opening the poppet valve 36 is
P · S _A + P · S _B + F = P (S _A + S _B ) + F. Therefore, P (S _D + S _A + S _C ) − ｛P (S _A
+ S _B ) + F｝ = P (S _D + S _C −S _B ) −F, if P (S _D + S _C −S _B ) <F, the poppet valve 3
6 is opened, and by setting the effective pressure receiving area of the large diameter diaphragm 43 sufficiently larger than the pressure receiving area of the small diameter diaphragm 44, the drain accumulated in the float chamber 12 is automatically and reliably discharged to the outside. be able to.

In order to discharge the drain before the drain reaches a predetermined water level, the drain in the container 10 can be discharged to the outside without pushing the manual operation part 56 and without rotating the screw. .

In such a drainage control process, the drainage channel 3
The main valve for opening and closing 8 is formed by a poppet valve having no sliding portion, and the opening and closing operation of this poppet valve 36 is controlled by a diaphragm having no sliding portion. Sliding resistance is not applied to the valve shaft 34, and foreign matter or the like is prevented from being caught in the main valve, so that the valve shaft 34 operates smoothly. Since the valve shaft 34 is held in the control case 21 by a plurality of diaphragms, the valve shaft 34 is held at a predetermined axis and is prevented from tilting or falling down.

Although the invention made by the inventor has been specifically described based on the embodiment, the invention is not limited to the above-described embodiment, and can be variously modified without departing from the gist of the invention. Needless to say, there is.

For example, in the case shown in the figure, the automatic drainage device is provided in the container 10 in which the filter element 18 is incorporated, but the automatic drainage device is incorporated in a container for only draining. May be.
In the case shown in the figure, it is used to remove moisture from compressed air, but the present invention can be applied to remove moisture in other gases than air.

[0041]

Advantageous effects obtained by typical ones of the inventions disclosed in the present application will be briefly described.
It is as follows.

(1) The main valve for opening and closing the drainage channel is formed by a poppet valve, and the operation of the poppet valve is controlled by the diaphragm. Since there is no sliding portion, the opening operation and the closing operation of the main valve can be reliably performed.

(2) Since the valve shaft of the poppet valve is provided with a plurality of diaphragms, the valve shaft does not fall or tilt, thereby improving the durability of the apparatus and stabilizing the operation of the poppet valve. Will be.

(3) Even if foreign matter enters the drainage channel, it is possible to prevent malfunction from occurring.

(4) Since the valve shaft is arranged in the horizontal direction, it is possible to expose the end of the valve shaft to the outside. Manual operation can be performed, and manual operability is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an automatic drainage device according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a main part of FIG.

FIG. 3 is a partially cutaway side view seen from the direction of arrow A in FIG. 1;

FIG. 4 is a sectional view showing a modification of the manual operation unit.

FIG. 5 is a sectional view showing a modified example of the drain discharge joint portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Container 12 Float room 13 Drainage control room 15 Inflow port 16 Outflow port 18 Filter element 21 Control case 23 Float 24 Gas supply path 25 Pilot valve 28 Pressure control block 30 Drainage chamber 31 Drainage control block 34 Valve shaft 36 Poppet valve (Main valve) ) 38 drainage channel 39 drainage joint 41 closing diaphragm 43 large diameter diaphragm 44 small diameter diaphragm 45 opening pressure chamber 46 closing pressure chamber 51 spring 52 atmospheric pressure introducing chamber 56 manual operation unit

Claims (3)

[Claims] 1. A container having a float chamber in which a primary pipe and a secondary pipe are connected and in which a float that moves up and down by a drain is housed, and a pilot that opens and closes a gas supply path that is opened and closed by the float. A valve, a poppet valve provided on a horizontally movable valve shaft below the float chamber, for opening and closing a drainage passage for discharging drain in the float chamber to the outside, and a closing diaphragm provided on the valve shaft. And an opening pressure chamber formed in communication with the gas supply path by a large diameter diaphragm having a larger diameter than the opening pressure chamber to urge the poppet valve in an opening direction; and the large diameter diaphragm provided on the valve shaft. A closing pressure chamber formed in communication with the float chamber by a small diameter diaphragm having a diameter smaller than that of the diaphragm, and biasing the poppet valve in a closing direction. Drainage system. 2. The automatic drainage device according to claim 1, wherein
The opening / closing pressure chamber is provided with a spring member for urging the poppet valve in a direction to open the poppet valve so that the opening / closing pressure chamber is normally opened or the closing pressure chamber is urged in a direction for closing the poppet valve. An automatic drainage device wherein a normally closed type is provided by providing a spring member. 3. The automatic drainage device according to claim 1, wherein
An automatic drainage device having a manual operation unit that operates in a direction to open the poppet valve body by axial movement.