JPH0227263Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Prior Art Field of the Invention) The present invention relates to an automatic opening/closing valve device incorporated in a drainage device for removing water accumulated in a road crossing piping pit installed at a power plant, for example.

(Problems in the Background Art) Generally, for drainage of road-crossing pits for various types of piping at power plants, oil bases, etc., branch pipes are connected to pressure steam piping and compressed air piping located close to each other.
A manual valve and ejector are installed in this branch pipe,
By opening and closing the manual valve, rainwater flowing into the pit is drained to prevent the piping located inside the pit from flooding.

However, with a manual drainage system, the number of road crossing pits installed is large and covers a wide area, so the labor required by the workers becomes large. Furthermore, if the manual valve is forgotten to be closed after use, working fluid such as pressurized steam is wasted, which goes against energy conservation.

Therefore, a technical means was developed in which the manual valve installed in the branch pipe was replaced with a solenoid valve and the opening/closing operation was performed by electric means to reduce labor and energy loss. Depending on the installation location, for example, near oil tanks or gas tanks, it may be necessary to install a separate explosion-proof device, which requires a large amount of expense.
It's not practical.

A technical measure was also proposed in which a float valve was installed in the branch pipe and the passage was opened and closed by the vertical movement of the float. Because it works,
The valve opens and closes in response to the vertical movement of the float, making it difficult to use it as a device for sending working fluid to an ejector that requires instantaneous opening and closing operations.

(Purpose of the invention) This invention was made in view of the above points,
To provide an automatic opening/closing valve device capable of instantaneously supplying a predetermined pressure necessary for operating an ejector by performing opening/closing operations by instantaneous vertical movement of a valve plug provided on a road.

(Summary of the invention) The invention consists of a valve device body in which a valve plug is installed in a passage connecting an inlet port and an outlet port to open and close the passage by moving up and down, and a parallel crank mechanism that connects a pair of links in a vertical direction. an actuating device that can be freely swung;
a spring device for biasing the link attached to the actuating device to both end positions; and an actuating rod connecting the valve plug and the link located above the parallel crank mechanism; The link is momentarily swung to both end positions, and the passage connecting the inlet port and the outlet port can be instantly switched from the fully open position to the fully closed position by the linked valve plug.

[Example of idea] An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 is the valve device main body,
This valve device main body 1 includes a lower casing 3 having an inlet port 2 and an injection case 7 having a cylindrical portion 6 provided between the upper casing having an outlet port 4. A valve plug 8 is disposed in a cylindrical portion 6 located in a passage connecting the ports 4 so as to be movable up and down.

As shown in FIG. 2, the valve plug 8 is constructed by mounting a seal ring 10 in an annular groove 9 provided on the outer circumferential surface.
By slidingly contacting the inner surface of the cylindrical portion 6, the passage can be opened and closed.

That is, a plurality of slits 11 are provided at intervals in the circumferential direction at a portion of the cylindrical portion 6 of the injection case 7 corresponding to the intermediate position of the operating stroke of the valve plug 8, and the valve plug 8 is provided with a plurality of slits 11 at intervals in the circumferential direction. When the valve plug 8 moves upward beyond the slit 11, the passage opens, and when the valve plug 8 moves below the slit 11, the passage closes.

On the other hand, an operating rod 1 is integrally attached to the lower end of the valve plug 8.
2 are connected in series, and the other end of this operating rod 12 is
It projects outwardly through a bottom opening 13 with a sealing device in the lower casing 3 of the valve device body 1 and is connected to an actuating device 14 provided on the underside of the valve device body 1 .

The actuating device 14 has a parallel crank mechanism 16 built into the casing 15, and a link 17 of the parallel crank mechanism 16 is fixedly installed in the casing 15 so as to be vertically positioned therein.

That is, the parallel crank mechanism 16 includes links 18 and 19 that are pivotally connected at one end to a fixed link 17.
is adapted to be able to swing in the vertical direction about the pivot point 20. One end of a connecting rod 21 is pivotally connected to the operating rod 12 via a pin 22 at an intermediate position in the longitudinal direction of the link 18 .

On the other hand, one end of an actuating rod 24 is pivotally connected to a portion of the casing 15 of the actuating device 14 on the side of the link 23 parallel to the link 17 fixed to the parallel crank mechanism 16, and the other end of the actuating rod 24 is attached to the casing 15. It extends outward through a vertically extending groove provided therein. A coil spring 2 is connected to a pin 25 provided at the longitudinal center of the actuating rod 24 and a pin 26 provided at the longitudinal center of the ring 23.
7 is attached.

In other words, the coil spring 27 acts so that the links 18 and 19 are instantly stopped from swinging at both ends in response to the swinging of the actuating rod 24.

FIG. 3 shows an example in which the automatic opening/closing valve device of the present invention is applied to a drainage system for a road crossing pit. The protruding end of the operating rod 24 engages with two pieces 34 and 35 which are placed at a distance from each other on the upper part of the operating rod 30.

That is, the upper piece 34 provided on the operating rod 30 is
This piece 34 is used to detect the low water position, and when the actuating rod 24 is moved, the link 18 swings vertically downward, moving the valve plug 8 downward and opening the passage. The lower piece 34 is for detecting the drain position, and when this piece 35 comes into contact with the actuating rod 24 and moves it, the link 18 swings vertically upward, opening the valve. The plug 8 is moved upward and acts to open the road.

On the other hand, the inlet port 2 of the valve device body 1 has an inlet pipe 36, and the outlet port 4 has an outlet pipe 37.
They are connected to each other, and an ejector 38 is disposed in the outlet pipe 37. One end of the pipe 39 is connected to the ejector 38, and the other end is connected to the road crossing pit 23.
The opening is at the water level where water should be drained.

Note that the inlet pipe 36 is connected to a source of steam or compressed air.

Next, the effect will be explained.

When the water level in the road crossing pit 32 is at the reduced water level (position 33), as shown in FIG.
The actuating rod 24 is in the lower swing position biased by the coil spring 27, and the valve plug 8 connected to the link 18 positions the seal ring 10 below the slit 11 of the cylindrical portion 6 of the injection case 7. in the closed position, with the passageway closed and no working fluid flowing through it.

Next, when water accumulates in the road crossing pit 32 and the water level rises to the draining position (dotted line position), the float 31 rises accordingly, and the lower piece 35 of the operating rod 30 hits the operating rod 24, pushing it up. Since the actuating rod 24 is adapted to take swing positions at both ends by the attached coil spring 27, it instantly moves to the top swing position shown in FIG. Accordingly,
The link 23 connected to the coil spring 27 moves upward, causing the link 18 to swing upward.

When the link 18 swings upward, this link 1
The valve plug connected to 8 moves upward, and the seal ring 10 moves to a position above the slit 11.

Then, the passage opens and the working fluid passes through the passage.
The water flows into the outlet pipe 37, and a predetermined operating pressure is applied to the ejector 38, which operates the water, and the water in the road crossing pit 32 is sucked up through the pipe 39 and drained.

When the displacement reaches the water reduction position, the upper piece 34 hits the actuating rod 24 and pushes it downward.
The actuating rod 24 instantly moves to the lower end swinging position by the action of the attached coil spring 27, and the link 18 swings downward, the valve plug 8 moves downward, the passage closes, and the ejector stops working,
Drainage is completed.

Similar actions can be repeated automatically thereafter.

Note that in order to effectively operate the ejector, it is necessary to instantaneously supply a constant operating pressure, and this device is ideal because it opens and closes the valve instantaneously.

(Effects of the invention) As described above, according to the invention, the opening/closing operation is performed by the instantaneous up and down movement of the valve plug provided in the passage. This has the effect that the valve can be switched from the fully open position to the fully closed position without using the valve.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an automatic on-off valve device according to the present invention, FIG. 2 is an enlarged view of a valve plug portion, and FIG. 3 is an explanatory diagram of a drainage device incorporating the automatic on-off valve device according to the present invention. 1...Valve device main body, 2...Inlet port, 4...
Outlet port, 6...Cylindrical part, 8...Valve plug, 1
1... Slit, 12... Actuation rod, 14... Actuation device, 16... Parallel crank mechanism, 17... Link, 18, 19... Link, 24... Actuation rod, 27... Coil spring.

Claims (1)

[Scope of utility model registration request] The main body of the valve device is equipped with a valve plug that moves up and down to open and close the passage connecting the inlet port and the outlet port, and the valve device has a parallel crank mechanism with paired links arranged vertically and one link connected to the valve device. An actuating device that is fixed to the main body and has the other link swingable, an actuating rod that has one end pivotally connected to the valve device main body, and one end that is connected to the actuating rod and the other end that is connected to the swinging link of the actuating device. 1. An automatic opening/closing valve device comprising: a spring device; and an operating rod connecting the valve plug to a link located above a parallel crank mechanism.