JP3365864B2 - Auto drain device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic drain device, and more particularly, to an automatic drain device for discharging air from a pilot chamber to the outside without clogging an exhaust orifice. It relates to a drain device. 2. Description of the Related Art FIG. 5 shows an example of a known automatic drain device. This automatic drain device 1 includes a bowl 2 for storing drain, a valve seat member 3 fitted to the bottom of the bowl 2, and A drain valve seat 4 attached to the valve seat member 3;
And a drain valve element 5 for opening and closing the drain valve element. The drain valve element 5 is driven by a valve element driving unit 6 described later. The housing 8 provided above the valve seat member 3 has a guide cylinder 9 for guiding the float 10 up and down, and the piston 11 slidably inserted into the housing 8 has a cylinder 11a extending downward. The drain valve body 5 is provided at the tip of the cylindrical portion.
The housing 8 is divided into a pilot chamber 13 in which a return spring 12 is contracted and a pressure receiving chamber 14 communicating with the bowl 2 by the piston 11 constituting the valve body driving unit 6. A pilot valve seat 15 communicating with the pilot chamber 13 is formed at an upper end. The pilot valve body 16 that opens and closes the pilot valve seat 15 is attached to the middle of a lever 17 whose base end is pivotally attached to the upper end portion of the guide cylinder 9 so as to be able to move integrally with the lever. The float 10 is connected by a connecting member 18. The pilot chamber 13 communicates with the outside through an exhaust orifice 19 provided in the piston 11, and the diameter of the exhaust orifice 19 is smaller than that of the pilot valve seat 15. The automatic drain device 1 includes a drain valve 5
In order to increase the opening time of the drain valve seat 4 due to the above, it is necessary to reduce the diameter of the exhaust orifice 19 and to increase the time until the air pressure in the pilot chamber 13 decreases.
When the exhaust orifice 19 is reduced in diameter, the pilot valve seat 1
When the exhaust orifice 19 is clogged, the pilot air is not discharged to the outside, and the drain 10 is automatically discharged by the vertical movement of the float 10. There is a problem that can not be. Also, the exhaust orifice 1
Even if a filter is attached to the filter 9, the filter is clogged with dust, and replacement of the filter is troublesome. [0004] It is an object of the present invention to provide an automatic drain device in which the exhaust orifice is not clogged and the valve drive unit operates reliably. [0005] In order to solve the above-mentioned problems, an automatic drain device according to the present invention comprises a bowl for storing a drain flowing from a drain inlet, and a drain valve for discharging the drain. A seat, a drain valve element for opening and closing the drain valve element, a valve element driving unit for driving the drain valve element, and a float that moves up and down by the liquid level of the drain in the bowl. In an automatic drain device in which a drain valve element opens and closes a drain valve seat by a valve element driving section driven by movement, the valve element driving section is provided in a pilot chamber and a bowl partitioned by a pressure receiving body attached to a cover of the bowl. A pressure receiving chamber communicating with the pressure receiving body, a rod connecting the pressure receiving body and the drain valve body, a pilot valve seat provided in a pilot passage communicating the pilot chamber into the bowl, and a pilot valve. An exhaust orifice having a smaller diameter than the valve seat and communicating the pilot chamber to the outside; and a lever on which a pilot valve body is mounted and which rotates by the up and down movement of the float to open and close the pilot valve seat. And a needle valve having a pin for cleaning the exhaust orifice and displacing integrally with the pressure receiving body. When the inside of the bowl is pressurized and the liquid level of the drain is low, the float moves down, and the pilot valve body is actuated by the pressure difference between the pressure receiving chamber and the pilot chamber acting opposite to the pilot valve body. Has closed the pilot valve seat. Therefore,
The pressure receiving body is displaced toward the pilot chamber, the drain valve body closes the drain valve seat, the needle valve closes the exhaust orifice, and a pin is inserted into the exhaust orifice. When the liquid level of the drain rises and the float moves up to a predetermined position, the lever rotates and the pilot valve body opens the pilot valve seat, so that pressurized air flows into the pilot chamber. When the air pressures of the pilot chamber and the pressure receiving chamber become substantially equal due to the inflow of the pressurized air, the drain valve body opens the drain valve seat by the pressurized air pressure acting on the drain valve body.
The drain in the bowl is discharged, and the needle valve opens the exhaust orifice. However, since the diameter of the exhaust orifice is smaller than the diameter of the pilot valve seat, the air pressure in the pilot chamber does not decrease even if the exhaust orifice is opened. When the float is lowered by drainage, the lever rotates in the direction opposite to the above direction to close the pilot valve seat, and the air pressure in the pilot chamber gradually decreases because the air in the pilot chamber is discharged from the exhaust orifice. As a result, the pressure receiving member is displaced toward the pilot chamber, so that the drain valve body closes the drain valve seat and the drain discharge ends. The displacement of the pressure receiving member causes the needle valve to close the exhaust orifice, and the exhaust orifice is cleaned by the pin. Cleaning the exhaust orifice with the above pin
Since the discharge is performed each time the discharge is completed, clogging of the exhaust orifice can be reliably prevented. FIG. 1 to FIG. 3 show a first embodiment of the present invention. This automatic drain device 21 comprises a bowl 22 for storing drain and an inner cylinder 23 inserted into the bowl 22.
And an adapter plate 24 covering the upper opening of the inner cylinder 23.
, A cover 25 hermetically attached to the upper opening of the bowl 22, and a valve element driving section 26 described later. The inner cylinder 23 and the adapter plate 24 are attached to the cover 25 by appropriate means (not shown). Installed. The bowl 22 has a drain inlet 28 above the side wall, a cylindrical portion 29 at the bottom and a drain outlet 3 below it.
1 is provided. The inner cylinder 23 has a bowl 2 below the side wall.
, A plurality of openings 33 for communicating with the inside, a notch portion for swinging a lever described later upward, and a drain discharge portion 3 which is hermetically fitted to the cylindrical portion 29 of the bowl 22 at the bottom.
5, and a drain valve seat 36 is formed on the lower surface of the drain discharge portion 35. The room between the adapter plate 24 and the cover 25 is partitioned into a pilot chamber 40 on the cover 25 side and a pressure receiving chamber 41 on the adapter plate 24 side by a diaphragm (pressure receiving body) 39 whose periphery is airtightly sandwiched therebetween. Reference numeral 40 communicates between the inner cylinder 23 and the bowl 22 through a pilot passage 43 and a pilot valve seat 42, and the pressure receiving chamber 41 directly communicates with the inner cylinder 23 and the bowl 22. A drain valve body 45 for opening and closing the drain valve seat 36 from below is mounted on a tip of a rod 46 passing through the drain discharge portion 35 by a nut 47. The central portion of the diaphragm 39 is sandwiched between a diaphragm retainer 48 and a shell 49, and the base end of the rod 46 is attached to a forked portion below the diaphragm retainer 48 so as to be swingable by a pin 50. An exhaust orifice 51 having a smaller diameter than the pilot valve seat 42 and communicating the pilot chamber 40 to the outside is provided. The connection between the diaphragm presser 48 and the rod 46 by the forked portion and the pin is
This is to improve the sealing performance of the drain valve body 45 by absorbing the deviation of the center position and angle between the diaphragm 39 and the drain valve seat 36. However, when the above deviation can be eliminated by precision processing or assembly, the diaphragm retainer 48 and the rod 46 may be formed integrally or directly connected by screws. A needle valve 52 for opening and closing the exhaust orifice 51 is formed in the diaphragm presser 48, and the needle valve 52 is provided with a pin 52a that is inserted into the exhaust orifice 51 and cleans the orifice. A float 54 surrounding the rod 46 is installed in the inner cylinder 23 so as to be vertically movable.
The connecting member 55 attached to the upper surface of the lever 56 is slidably inserted into one end of the lever 56, and pressing portions 55a and 55b for pressing and rotating the lever 56 are formed at the upper and lower ends. The lever 56 has an adapter plate 2 at an intermediate portion.
A pilot valve body 58 rotatably supported by a fulcrum shaft 57 provided to the pilot valve 4 and opening and closing the pilot valve seat 42 is mounted near the other end.
The weight on the 8 side is heavier than on the opposite side. A lever 56 having a pilot chamber 40 and a pressure receiving chamber 41 partitioned by the pressure receiving body 39, a pilot valve seat 42, a rod 46, an exhaust orifice 51, and a pilot valve body 58.
Thus, the valve element driving section 26 is configured. Although not shown, the rod 46 passes through a penetrating portion formed in the lever 56 so that its vertical movement and rotation of the lever 56 do not interfere with each other. A manual operation button 65 penetrating through the cover 25 and the adapter plate 24 is
The spring is biased in a direction to protrude from the front end and is prevented from coming off by a retaining ring 67 fitted near the front end. The tip of the manual operation button 65 is opposed to the tip of the lever 56 (the right end in FIG. 1) with a slight gap. In the first embodiment, when the inside of the bowl 22 is pressurized and the liquid level of the drain is low, the float 54 descends, and the pilot valve body 58 is moved by the pressure difference between the pressure receiving chamber 41 and the pilot chamber 40. The pilot valve seat 42 is closed. Therefore, the diaphragm 39 is connected to the pilot chamber 40.
The drain valve body 45 is displaced to the side, the drain valve body 45 closes the drain valve seat 36, the pressing portion 55a of the connecting member 55 contacts the upper surface of one end of the lever 56, and the exhaust orifice 51 is closed by the needle valve 52 (FIG. 1). reference). When the float 54 rises to a predetermined height due to a rise in the liquid level of the drain in the bowl 22, the pressing portion 5
5b contacts one end of the lever 56 (see FIG. 2), and when the float 54 further floats, the pressing portion 55b presses one end of the lever 56 to rotate the lever 56 clockwise in the drawing, so that the pilot valve body 58 Pilot valve seat 42
And the pressurized air in the bowl 22 is
Flow into zero. In this case, since the lever 56 has a large weight on the pilot valve body 58 side, the pilot valve body 58 maintains the state where the pilot valve seat 42 is opened. The flow of the pressurized air causes the pilot chamber 40
When the air pressure in the pressure receiving chamber 41 is substantially equal to the pressure in the pressure receiving chamber 41, the drain valve body 45 and the diaphragm 39 are displaced downward by the pressurized air pressure acting on the drain valve body 45. The drain stored in 22 is discharged, and at the same time, the needle valve 52 opens the exhaust orifice 51 (see FIG. 3). However, since the diameter of the exhaust orifice 51 is smaller than the diameter of the pilot valve seat 42, the air pressure in the pilot chamber 40 does not decrease even if the exhaust orifice 51 is opened. When the liquid level of the drain falls due to discharge,
The float 54 and the connecting member 55 are lowered and the pressing portion 55a
Presses one end of the lever 56 to rotate the lever 56 counterclockwise, so that the pilot valve body 58 closes the pilot valve seat 42. As a result, the air in the pilot chamber 40 is discharged from the exhaust orifice 51 to the outside and the air pressure gradually decreases, and the air pressure in the pressure receiving chamber 41 causes the diaphragm 19 to be displaced to the pilot chamber 40 side. The valve seat 36 is closed, and drain discharge is completed. The pilot chamber 40 of the diaphragm 39
The needle valve 52 moves upward in the drawing due to the displacement to the side to close the exhaust orifice 51, and the pin 52a
Is inserted into the exhaust orifice 51 to clean the exhaust orifice. Since the cleaning of the exhaust orifice 51 by the pin 52a is performed each time the drainage is completed, clogging of the exhaust orifice 51 can be reliably prevented. The exhaust orifice 51 is connected to the drain valve body 4
5 is usually 0.2 mm to 0.8 mm in order to prolong the valve opening time of the drain valve seat 36, but in the above-described embodiment, the pin 52b is inserted into the exhaust orifice 51 to exhaust air. Since the effective area of the orifice 51 is reduced, its diameter can be increased to about 0.8 to 2.0 mm. FIG. 4 shows a second embodiment of the present invention in which a piston 70 is used as a pressure receiving member, and a pilot chamber 40 and a pressure receiving chamber 41 are shown.
The piston 70 is provided with a needle valve 52 on the upper side, and the base end of the rod 46 is swingably mounted by a pin 50 on the lower forked portion. Since the other configuration of the second embodiment is the same as that of the first embodiment, the same reference numerals are given to the same main parts in the drawing, and the detailed description is omitted. According to the automatic drain device of the present invention, the pin provided on the needle valve which is displaced integrally with the pressure receiving member cleans the exhaust orifice every time the drain discharge is completed. It is possible to reliably prevent a malfunction of the valve body drive unit due to clogging.

[Brief description of the drawings] FIG. 1 is a vertical sectional front view of a first embodiment. FIG. 2 is a longitudinal sectional front view immediately before the pilot valve seat is opened. FIG. 3 is a vertical sectional front view showing a cleaning state by a pin. FIG. 4 is a longitudinal sectional front view showing a main part of a second embodiment. FIG. 5 is a vertical sectional front view of a known automatic drain. [Explanation of symbols] 21 Auto drain device 22 bowls 25 cover 26 Valve drive unit 36 Drain valve seat 39 Diaphragm 40 Pilot room 41 Pressure receiving chamber 42 Pilot valve seat 43 Pilot passage 45 Drain valve 46 rod 51 exhaust orifice 52 Needle valve 52a pin 54 float 55 connecting members 56 lever 58 Pilot valve 70 piston

Claims (1)

(1) A bowl for storing a drain flowing from a drain inlet, a drain valve seat for discharging the drain, and a drain valve body for opening and closing the drain valve seat A valve body drive unit for driving the drain valve body, and a float that moves up and down by the liquid level of the drain in the bowl, and the drain valve body is driven by the up and down movement of the float to form a drain valve body. An auto drain device for opening and closing a drain valve seat, wherein the valve body driving unit is a pressure receiving chamber communicated with a pilot chamber defined by a pressure receiving body attached to a cover of the bowl and a bowl, and the pressure receiving body and a drain valve. A rod connecting the body, a pilot valve seat provided in a pilot passage communicating the pilot chamber into the bowl, and an exhaust orifice having a smaller diameter than the pilot valve seat and communicating the pilot chamber to the outside. And a lever on which a pilot valve element is attached and rotated by vertical movement of the float to rotate the pilot valve element to open and close a pilot valve seat, wherein the pilot chamber has a pin for cleaning an exhaust orifice, and An automatic drain device comprising a needle valve which is integrally displaced.