JP3803466B2 - Automatic drainage device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automatic drainage device provided between a pneumatic operating device and a pneumatic pressure source, for draining water contained in compressed air supplied to the pneumatic operating device.
[0002]
[Prior art]
When compressed air stored in a pneumatic tank from a compressor is supplied to various pneumatic actuators such as pneumatic cylinders via piping, the pneumatic tank and pneumatic actuator are used as a compressed air source. A filter, regulator, and lubricator are incorporated in the piping for connection.
[0003]
The filter is for removing moisture or drainage and dust mixed in the compressed air and supplying clean air to the pneumatic actuators. The regulator is the pressure of the compressed air supplied from the pneumatic supply source to the pneumatic actuators. The lubricator is for supplying lubricating oil to the pneumatic operating device by mixing the lubricating oil in the form of mist into the compressed air supplied to the pneumatic operating device. A combination of the above-described pneumatic devices such as a filter is generally referred to as a pneumatic refining unit or a FRL unit.
[0004]
The filter usually has a container or a case in which a filter element is incorporated, and water droplets contained in the air are stored at the bottom of the case. When a predetermined amount of water droplets or drainage is accumulated in the case, an automatic drainage device, that is, automatic drain is provided in the filter in order to automatically drain the drainage in the case to the outside. As the auto drain, there is a float type, and the discharge valve is indirectly opened and closed by the buoyancy of the float. Further, an automatic drainage device, that is, an automatic drainer may be 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 pneumatic / pneumatic manual” (issued on February 13, 1989) published by Ohm Co., Ltd.
[0005]
[Problems to be solved by the invention]
As for the automatic drain, that is, the automatic drainage device that has been developed so far, the drain drain main valve is composed of a sliding piston, and the lubrication oil adheres to the sliding part and the operation is not smooth. If a foreign object is caught in the sliding part, durability may be impaired.
[0006]
In addition, in the automatic drainage device, the valve can be opened and closed by manual operation, and the piston is operated in the vertical direction, so the drain cock provided in the drain part is It is rotated and the piston is moved by a screw. For this reason, unless the drain cock is rotated a plurality of times, the valve cannot be manually opened and closed, and there is a problem that its operability is poor.
[0007]
An object of the present invention is to provide an automatic drainage device having a poppet type and a diaphragm type valve body and having excellent durability and reliability.
[0008]
The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.
[0009]
[Means for Solving the Problems]
Of the inventions disclosed in this application, the outline of typical ones will be briefly described as follows.
[0010]
That is, the automatic drainage apparatus of the present invention includes a container having a float chamber in which a primary side pipe and a secondary side pipe are connected, and a float that moves up and down by a drain is accommodated, and a gas supply that is opened and closed by the float. A pilot valve that opens and closes a passage; a poppet valve that is provided on a valve shaft that is movable in a horizontal direction below the float chamber; and that opens and closes a drain passage that discharges drain in the float chamber to the outside. An opening pressure chamber that is formed in communication with the gas supply path by a closed diaphragm and a larger diameter diaphragm, and is provided in the valve shaft for urging the poppet valve in an opening direction. And a closing pressure chamber formed in communication with the float chamber by a small diameter diaphragm having a smaller diameter than the large diameter diaphragm and biasing the poppet valve in the closing direction. And wherein the door.
[0011]
In the present invention, the main valve for opening and closing the drainage channel for discharging the drain in the container is formed by the poppet valve, and the pilot valve portion is also formed by the diaphragm, and has no sliding portion. As a result, the sealing performance of the poppet valve is improved, the foreign matter is prevented from being caught, and a reliable and smooth operation is possible, so that drainage can be drained reliably.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0013]
1 to 3 are views showing an automatic drainage apparatus according to an embodiment of the present invention. A case for storing a drain, that is, a container 10 has an upper end opened, and a partition wall 11 provided in the container 10. A float chamber 12 is formed on the upper side, and a drainage control chamber 13 is formed on the lower side. A port block 14 is detachably attached to the upper end of the container 10. An inflow port 15 to which a primary side pipe 15 a is connected and a secondary side pipe 16 a are connected to the port block 14. An outflow port 16 to be connected is formed.
[0014]
The port block 14 is provided with a louver 17, also called a deflector, positioned at the opening of the container 10, and air flowing into the container 10 from the primary side pipe 15 a through the inflow port 15 is forced by the louver 17. , And a rotating air flow is generated along the inner wall of the container 10, whereby relatively large water droplets, oil droplets and solid foreign matters having a large specific gravity in the inflowing air are centrifuged.
[0015]
A cylindrical filter element 18 made of sintered metal or the like is attached to the port block 14, and the air from which most of the foreign matter has been removed after passing through the louver 17 has the remaining foreign matter removed by the filter element 18. After being removed, it flows through the outflow port 16 toward the secondary side pipe 16a.
[0016]
A baffle 19 is attached to the port block 14 in order to prevent the drain accumulated in the float chamber 12 from being wound up by the airflow and mixed into the airflow.
[0017]
A control case 21 having a rectangular outer peripheral surface is incorporated in a drainage control chamber 13 provided at the lower end of the container 10, and a support rod portion 21 a protruding into the float chamber 12 is incorporated in the control case 21. And the partition part 21b located in the control case 21 is provided integrally. The control case 21 is inserted through an opening formed at the lower end of the container 10, and the opening is closed by the bottom lid 22.
[0018]
A float 23 is accommodated in the float chamber 12 so as to surround the support rod portion 21a, and a pilot valve 25 for opening and closing a gas supply path 24 formed in the support rod portion 21a is provided at the upper end portion of the support rod portion 21a. Is provided. In order to open and close the pilot valve 25 as the float 23 moves up and down, one end of an operating rod 27 is connected to a connecting bracket 26 attached to the float 23, and the other end of the operating rod 27 is 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.
[0019]
A pressure control block 28 is disposed in the control case 21 so as to be positioned on one side of the partition wall 21 b, 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 so as to be positioned on the other side of the partition wall portion 21 b, and the drainage control block 31 is screwed into a screw hole 32 formed in the container 10. It is concluded by
[0020]
A valve shaft 34 is provided in the control case 21 so as to be horizontally oriented and movable in the axial direction, and a disk portion 35 provided on the valve shaft 34 is covered with an elastic body such as rubber so as to cover it. A poppet valve 36, that is, a main valve is formed. The poppet valve 36 has a conical surface that contacts a valve seat 31 a formed in the drainage control block 31, and is connected to the bottom of the float chamber 12 through a communication hole 37 formed in the partition wall 11. The drainage channel 38a and the downstream drainage channel 38b are communicated and blocked, and the drainage channel 38 formed by the upper and lower drainage channels 38a, 38b is opened and closed. As shown in FIG. 3, the lower drainage channel 38 b communicates with a drainage joint 39 that protrudes from the bottom lid 22, and is separated from the container 10 by a hose or tube connected to the drainage joint 39. Drain is discharged at the position. The communication hole 37 may be provided with a mesh-like strainer 40 made of a wire mesh or the like so that dust and foreign matters do not enter the drainage channel 38a.
[0021]
A closing diaphragm 41 formed integrally with the poppet valve 36 is provided on the valve shaft 34, and 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 41 are A drainage chamber 30 communicating with the upper drainage channel 38a is formed between them. When the poppet valve 36 closes the drainage channel 38, the upstream drainage channel 38 a is closed by the closing diaphragm 41.
[0022]
The valve shaft 34 is provided with a stepped disk portion 42, and an elastic body such as rubber is attached to the outer side of the valve shaft 34. And are formed. The outer peripheral portions of the diaphragms 43 and 44 are fixed to the diaphragm support tube 29.
[0023]
An opening pressure chamber 45 is formed in the control case 21 by the closing diaphragm 41 and the large-diameter diaphragm 43. The opening pressure chamber 45 communicates with a gas supply path 24 formed in the support rod portion 21a. Yes. When the pilot valve 25 is opened and compressed air is supplied into the opening pressure chamber 45, the diameter of the large-diameter diaphragm 43 is larger than that of the closing diaphragm 41, so that the poppet valve 36 is opened on the valve shaft 34. Pressure is applied in the direction of
[0024]
A closing pressure chamber 46 is formed between the small diameter diaphragm 44 and the pressure control block 28, and the closing pressure chamber 46 communicates with the float chamber 12 via a flow path 47. Therefore, the pressure supplied in the closing pressure chamber 46 urges the valve shaft 34 in a direction to close the poppet valve 36. As shown in the figure, the flow path 47 may be communicated with the bottom of the float chamber 12, and as shown by a two-dot chain line in FIG. 2, the support rod portion 21a communicates with the flow path 47. By forming a flow path 47 a communicating above the float 23 in the float chamber 12, the drain may not enter the closing pressure chamber 46.
[0025]
In the opening pressure chamber 45, a coil spring 51 that urges a spring force in a direction to open the poppet valve 36 with respect to the valve shaft 34 is incorporated, and in a state where compressed air is not supplied into the container 10, This is a normally open automatic drain device in which the poppet valve 36 is opened by the spring force of the spring 51. 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, the spring force of the spring 51a is applied in a state where compressed air is not supplied into the container 10. Thus, a normally closed automatic drainage device in which the poppet valve 36 is closed is obtained.
[0026]
An atmospheric pressure introduction chamber 52 is formed between the large diameter diaphragm 43 and the small diameter diaphragm 44, and the atmospheric pressure introduction chamber 52 communicates with the outside through a bleed hole 53. The opening pressure chamber 45 communicates with the lower drainage passage 38b through the orifice 54, and after the drain in the float chamber 12 is discharged to the outside, the opening pressure chamber 45 is opened through the orifice 54. Is returned to atmospheric pressure.
[0027]
The valve shaft 34 includes a portion 34 a having a disk portion 35 and a portion 34 b having a stepped disk portion 42 for the convenience of manufacturing and assembly. A series of valve shafts 34 are configured. One end portion 56 of the valve shaft 34 protrudes from the end face of the drainage control block 31, and this portion 56 is a manual operation portion, that is, a manual operation portion. Therefore, when the operator presses this portion, the poppet valve 36 can be manually opened. Thus, the valve shaft 34 is in a horizontal direction that is perpendicular to the vertical direction of the float 23, and by exposing the end of the outside, the exposed portion can be used as a manual operation unit. The valve shaft 34 can be easily operated by an operation of pushing it.
[0028]
With the exception of the manual operation unit 56, the valve shaft 34 is not actuated by the poppet valve 36 and the other diaphragms 41, 43, and 44 when the valve is opened and closed. Since the pressure of the drain is low, the sliding resistance in the manual operation portion 56 can be reduced, so that the operating resistance of the valve shaft 34 when the valve shaft 34 is opened and closed can be reduced, and a small pressure or spring The valve shaft 34 can be smoothly operated by force.
[0029]
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 so that no sliding resistance is applied to the valve shaft 34. In this way, the valve shaft 34 can be operated more smoothly. 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 protrudes.
[0030]
FIG. 5 is a view showing an automatic drainage device provided with a quick joint as a modified example of the drainage joint 39, and a joint body 62 is fixed to a base 61 attached to the bottom surface of the container 10. A lock claw 63 is incorporated in the distal end portion. The flexible tube 64 fitted to the joint body 62 is made of synthetic resin such as nylon or urethane, and the flexible tube 64 is fastened by the lock claw 63 by being pushed into the joint body 62. In order to release the fastening by the lock claw 63, the release sleeve 65 is fitted in the distal end portion of the joint body 62. By using this drainage joint 39, the flexible tube 64 can be attached and detached quickly.
[0031]
Next, the operation of the above-described automatic drainage device will be described. First, when air is not supplied into the container 10 from the primary side pipe 15a, only the spring force of the spring 51 is applied to the valve shaft 34. 1 and 2, the valve shaft 34 moves rightward, that is, the poppet valve 36 moves away from the valve seat 31a, the drainage channel 38 is opened, and the drainage chamber 30 communicates with the drainage channel 38b. . Therefore, if drain has accumulated in the float chamber 12 of the container 10 before this, the drain is discharged from the drainage joint 39 to the outside. If the spring 51 a is provided in the closing pressure chamber 46 without providing the spring 51 in the opening pressure chamber 45, it becomes a normally closed type contrary to the above.
[0032]
Next, when compressed air is discharged from the primary side pipe 15a to the secondary side pipe 16a through the inside of the container 10, there is no drain in the float chamber 12, or there is only a drain below a predetermined value. When it does not exist, the float 23 is lowered, and the gas supply path 24 is closed by the pilot valve 25.
[0033]
When the pressure in the float chamber 12 of the container 10 at this time is P, the pressure acts on the drain 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 that acts on the small diameter diaphragm 44 and S _C, the effective pressure receiving area of the poppet valve 36 and S _D, the spring force of the spring 51 Assuming F, the force in the direction of closing the poppet valve 36 applied to the valve shaft 34 is P · S _D + P · S _C = P (S _D + S _C ). On the other hand, the force in the direction of opening the poppet valve 36 is P · S _A + F.
[0034]
Therefore, if P (S _D + S _C −S _A )> F, the poppet valve 36 closes the drainage channel 38, and the effective pressure receiving area of the small-diameter diaphragm 44 is sufficiently larger than that of the closing diaphragm 41. By setting, the poppet valve, that is, the main valve 36 is closed by the pressure of the compressed air supplied into the container 10.
[0035]
Next, when a drain of a predetermined value or more is stored in the float chamber 12 and the pilot valve 25 opens the gas supply path 24 by the upward movement of the float 23, the pressure in the container 10 is also supplied to the opening pressure chamber 45. It will be. When the effective pressure receiving area of the large-diameter diaphragm 43 is S _B , the force in the direction of closing the poppet valve 36 is
P · S _D + P · S _A + P · S _C = P (S _D + S _A + S _C )
[0036]
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, P (S _D + S _C −S _B ) <F
If so, the poppet valve 36 is opened, and the effective pressure receiving area of the large-diameter diaphragm 43 is set sufficiently larger than the pressure receiving area of the small-diameter diaphragm 44, so that the drain accumulated in the float chamber 12 is automatically ensured. Can be discharged to the outside.
[0037]
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 by simply pushing the manual operation unit 56 and without rotating the screw.
[0038]
In such a drainage control process, the main valve that opens and closes the drainage channel 38 is formed by a poppet valve that does not have a sliding portion, and the poppet valve 36 has an opening and closing operation that has a sliding portion. Since the valve shaft 34 is controlled by a non-diaphragm, sliding resistance is not applied to the valve shaft 34, and foreign matter and the like are 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.
[0039]
As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. Needless to say.
[0040]
For example, in the illustrated case, the automatic drainage device is provided in the container 10 in which the filter element 18 is incorporated. However, the automatic drainage device may be incorporated in a container for only draining. . In the illustrated case, it is used to remove moisture from the compressed air, but the present invention can also be applied to remove moisture in gases other than air.
[0041]
【The invention's effect】
Of the inventions disclosed in the present application, effects obtained by typical ones will be briefly described as follows.
[0042]
(1) Since the main valve that opens and closes the drainage channel is formed by a poppet valve, and the operation of this poppet valve is controlled by a diaphragm, the sliding part is included in the part that controls the operation including the main valve. Therefore, the opening operation and closing operation of the main valve can be performed reliably.
[0043]
(2) Since the valve shaft of the poppet valve is provided with a plurality of diaphragms, there is no tilting or tilting of the valve shaft, which improves the durability of the device and stabilizes the operation of the poppet valve. .
[0044]
(3) Even if foreign matter enters the drainage channel, it can prevent malfunction.
[0045]
(4) Since the valve shaft is arranged in the horizontal direction, the end of the valve shaft can be exposed to the outside, and manual operation of the main valve can be performed simply by moving the valve shaft in the axial direction. It can be performed and the manual operability is improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an automatic drain device according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view showing a main part of FIG.
3 is a partially cutaway side view seen from the direction of arrow A in FIG. 1. FIG.
FIG. 4 is a cross-sectional view showing a modified example of the manual operation unit.
FIG. 5 is a cross-sectional view showing a modified example of the drain discharge joint portion.
[Explanation of symbols]
10 container 12 float chamber 13 drainage control chamber 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 Blocking diaphragm 43 Large diameter diaphragm 44 Small diameter diaphragm 45 Opening pressure chamber 46 Closing pressure chamber 51 Spring 52 Atmospheric pressure introduction chamber 56 Manual operation section

Claims (4)

A container having a float chamber in which a primary pipe and a secondary pipe are connected, and a float that moves up and down by a drain is housed;
A pilot valve that is opened and closed by the float to open and close the gas supply path;
A poppet valve that is provided on a valve shaft that is movable in the horizontal direction below the float chamber, and that opens and closes a drainage channel that drains the drain in the float chamber to the outside;
An opening pressure chamber formed in communication with the gas supply path by a closing diaphragm provided on the valve shaft and a larger diameter diaphragm than this, and urges the poppet valve in an opening direction;
A pressure chamber for closing formed in communication with the float chamber by a small-diameter diaphragm provided on the valve shaft and having a diameter smaller than that of the large-diameter diaphragm and biasing the poppet valve in a closing direction. Automatic drainage device. The automatic drainage device according to claim 1, an automatic drainage device, characterized in that by providing a spring member for urging in a direction to open the poppet valve in the closing pressure chamber is normally open. 2. The automatic drain device according to claim 1, wherein the automatic drain device is of a normally closed type by providing a spring member that biases the poppet valve in a closing direction in the closing pressure chamber . 2. The automatic drainage device according to claim 1, further comprising a manual operation unit that operates in a direction to open the poppet valve by axial movement.

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