JPH11153233A - Water seal valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain sealability for a long period without abrading a seal member. SOLUTION: In a valve device provided with a fixed valve seat 12 disposed at an inner circumferentail part of a conduit, and a valve element 13 disposed to face the fixed valve seat 12 to be capable of advancing/retracting, and composed in such a way that water can be stored in the valve element 13 when a valve plate is closed, the valve element 13 is supported by arms of different lengths, and the valve element 13 is moved roughly in parallel to the fixed valve seat 12 when closure is being completed, therefore the seal member is not abraded to maintain sealability for a long period.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a water-sealing valve device for shutting off fluid such as toxic gas which requires complete sealing.

[0002]

2. Description of the Related Art In general, in the case of a conventional water-sealing valve device, for example, as shown in FIGS. 3 and 4, in the case of a butterfly valve, a valve body 30 has a double structure composed of valve plates 30a and 30b, and water is interposed therebetween. One that stores and seals 31 has been proposed. The valve body 30 is rotatably disposed around the valve shaft 32 with respect to the frame 33, and a seal member 36 is fixed around the valve body 30. Further, the frame 33 is provided with a fixed valve seat 33 a, an inlet 34 and a drain 35, and when the valve 30 is closed, water is supplied from the inlet 34 and sealed in the valve 30. It is for filling water.

[0003]

By the way, in the above-mentioned water seal valve device, when the valve element 30 is opened and closed, the sealing member 36 is used.
However, there is a drawback that the slider slides on the surface of the fixed valve seat 33a and gradually wears. When the seal member is worn, the sealing property cannot be maintained, water cannot be accumulated between the valve plates, and the seal member cannot be used as a water seal valve device.

SUMMARY OF THE INVENTION An object of the present invention is to provide a water sealing valve device in which the sealing member is not deteriorated by abrasion in view of the above-mentioned conventional disadvantages.

[0005]

A water sealing valve device according to the present invention comprises a fixed valve seat disposed on an inner peripheral portion of a pipe, and a valve disposed so as to be able to advance and retreat facing the fixed valve seat. A valve body that is capable of storing water inside the valve body when the valve plate is closed, wherein the valve bodies are supported by arms having different lengths, and the valve body is fixed near the time when the closing is completed. It is characterized by moving substantially parallel to the valve seat. Further, the valve body has a seal member on a surface facing the fixed valve seat.

[0006] Thus, the water seal valve device according to the present invention comprises:
When the closing is completed, the valve element moves substantially parallel to the fixed valve seat, so that the seal member is less likely to be worn, and complete sealing can be performed for a long period of time.

[0007]

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a front view showing a water seal valve device according to one embodiment of the present invention, and FIG. 2 is a sectional view of a main part of the water seal valve device according to one embodiment of the present invention. In the figure, reference numeral 10 denotes a valve box, in which a pipe line 11 is formed. Also,
Two valve seats 12 a and 12 b are arranged at a predetermined interval on the inner peripheral portion of the conduit 11 to form a fixed valve seat 12.

[0008] As shown in FIG.
The two valve seats 12a, 12b arranged at a predetermined interval to form the water jacket 30 when the valve seat 3 is closed.
It has. The valve seat 12a is formed short so that the valve element 13a passes therethrough, and tall so that the valve seat 12b does not pass therethrough.

The fixed valve seat 12 has a water supply / drain port 14 and a water discharge port 15 located on the outer periphery of the valve box 10, and supplies water from the water supply / drain port 14 to a tank 16 having a predetermined head. And overflow from the tank 16.

The valve element 13 has a valve element 13a and a valve element 13b having different diameters connected to each other by a plurality of support columns 17 at predetermined intervals. The valve element 13a has a small diameter and can pass through the inner diameter of the valve seat 12a. However, it is larger than the inner diameter of the valve seat 12b and cannot pass therethrough. Also,
The outer circumference of the valve element 13b is larger than the inner diameter of the valve seat 12a,
I can't pass. Valve element 13a and valve element 13b
Is equal to the distance between the valve seats 12a and 12b.

A seal member 18 or the like, which is an elastic body, is embedded in a portion of the valve element 13 which comes into contact with the valve seats 12a and 12b of the valve elements 13a and 13b. Is improving. The seal member 18 may be embedded in the fixed valve seat 12 on the contact surface with the valve body 13. The valve body 13 is supported at the center by a first arm 21 that is pin-connected to a support projection 20 erected at the center via a mounting plate 19. The first arm 21 is provided with a valve opening / closing shaft 22.
The base end is fixed. The valve opening / closing shaft 22 is disposed through the valve box 10, and both ends are supported outside the valve box.

The valve opening / closing shaft 22 has both ends rotatably supported by bearings 23 and is connected to a driving mechanism 24. Mounting plates 25, 25 are fixed to both sides of the mounting plate 19 of the valve body 13, and support projections 26 are fixed respectively. The support protrusion 26 is formed to be longer than the support protrusion 20, and is pin-connected to the second arm 27.
The second arm 27 is rotatably supported by a fixed shaft 28 fixed to a part of the valve box 10.

In this embodiment, the driving mechanism 24 comprises a hydraulic cylinder 24a and a piston 24b. When the hydraulic cylinder 24a is driven by a control mechanism (not shown), the piston 24b connected to the valve opening / closing shaft 22 by an arm. Expands and contracts, and rotates the valve opening / closing shaft 22. When the valve opening / closing shaft 22 rotates, the valve 13 is opened / closed.

Next, the operation of the water seal valve device configured as described above will be described. First, when closing the water seal valve device, the drive mechanism 24 is operated by a control mechanism (not shown). The valve opening / closing shaft 22 is rotated by the hydraulic cylinder 24b, and the valve body 13 is moved in a direction in which the valve body 13 comes into contact with the fixed valve seat 12 by a link mechanism including the support protrusion 20 and the first arm 21, the support protrusion 26, and the second arm 27. Moving.

Here, the valve body 13 moves along a trajectory almost parallel to the fixed valve seat 12 by the action of the link mechanism near the time of completion of closing. Therefore, the valve body 13 can be closed without the seal member 18 rubbing.
Since the valve element 13a is smaller than the inner diameter of the valve seat 12a, it passes through the valve element 13a and contacts the valve seat 12b. Further, since the outer diameter of the valve element 13b is larger than the inner diameter of the valve seat 12a, the valve element 13b abuts without passing through.

Water is supplied from a supply source through a valve Y into a water jacket 30 formed by closing the valve body 13 as shown in FIG. In this manner, the water seal valve device is closed, and toxic gas and the like can be sealed. At this time, the valve X is closed.

When opening the water seal valve device, first, the sealing water in the water jacket is drained from the water supply / drain port 14 through the valve X. At this time, the valve Y is closed. Thereafter, the valve opening / closing shaft 22 is rotated by the hydraulic cylinder 24a as the driving mechanism 24, and the valve body 13 is moved to the fixed valve seat 1
Separated from 2.

The valve body 13 includes a support projection 20, a first arm 2
The opening mechanism starts to move in a direction substantially parallel to the fixed valve seat 12 by the link mechanism including the first and support projections 26 and the second arm 27, and gradually reverses to open the pipe line 11 as shown by the imaginary line in FIG. It will be in a parallel state. Therefore, the seal member 18 does not wear. In this way, the water seal valve device can be opened.

The present invention is not limited to the above embodiment, and various design changes can be made based on the technical concept of the present invention.

[0020]

As described above in detail, according to the water seal valve device according to the present invention, the fixed valve seat disposed on the inner peripheral portion of the pipe can move forward and backward in opposition to the fixed valve seat. And a valve device that can store water inside the valve body when the valve plate is closed. The valve body is supported by arms having different lengths, and the valve body is closed. Since it moves substantially parallel to the fixed valve seat near the time of completion, the sealing member does not wear away due to friction, and the sealing performance can be maintained for a long time.

[Brief description of the drawings]

FIG. 1 is a front view showing a water seal valve device according to one embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a water seal valve device according to an embodiment of the present invention.

FIG. 3 is a sectional view of a main part showing one embodiment of a conventional water seal valve.

FIG. 4 is a sectional view of a main part of a seal portion showing a conventional water seal valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Valve box 11 Pipe line 12 Fixed valve seat 12a, b Valve seat 13 Valve body 13a, b Valve element 14 Supply / drain port 15 Drain port 16 Tank 17 Support column 18 Seal member 19 Mounting plate 20 Support projection 21 First arm 22 Valve opening / closing Shaft 23 Bearing 24 Drive mechanism 24a Hydraulic cylinder 24b Piston 25 Mounting plate 26 Support protrusion 27 Second arm 28 Fixed shaft 30 Valve 31 Water 32 Valve shaft 33 Frame 34 Inlet 35 Drain 36 Sealing member

Claims (2)

[Claims] 1. A fixed valve seat disposed on an inner peripheral portion of a pipe,
A valve body which is disposed opposite to the fixed valve seat so as to be able to advance and retreat, and wherein water can be stored inside the valve body when the valve plate is closed, wherein the valve bodies have different lengths. A water seal valve device supported by an arm, wherein the valve body moves substantially parallel to the fixed valve seat near the time of completion of closing. 2. The water seal valve device according to claim 1, wherein the valve body has a seal member on a surface facing the fixed valve seat.