JPS5872779A - Fluid pipe line shutoff device - Google Patents

Abstract

PURPOSE:To block a flow for sure and to prevent the secondary disaster by automatically sensing the change of a flow speed in a pipe when a water pipe or the like are broken and by automatically shutting off a closing valve fitted to the water pipe or the like. CONSTITUTION:When a fluid pipe line 1 is broken caused by a natural calamity such as an earthquake or the like or an accident, a vane 17 is displaced accordingly. An auxiliary selector valve 16 is switched by the displacement and air is sent from the auxiliary selector valve 16 to a secting cylinder 14a through a delay circuit 16', then the air in a secting cylinder 14b is discharged into the atmosphere through a release selector valve 15', thereby a main selector valve 14 is switched over and the air in a cylinder 8 is discharged into the atmosphere through the main selector valve 14, then an actuator 9 is operated and the closing valve 3 is kept in a closed condition and fluid discharge can be completely prevented.

Description

Detailed Description of the Invention This invention detects changes in the flow velocity in the pipe when a fluid pipe such as a water pipe is damaged due to a natural disaster such as an earthquake or other small damage, and automatically shuts off the pipe. Concerning pipe breaker devices〇 Conventionally, when a water pipe, etc. is damaged due to a natural disaster such as an earthquake or an accident, a worker detects the change, and the operator installs an opening/closing device installed on the water pipe, etc. Valve shutoff operations are being carried out.

However, if a natural disaster such as an earthquake or an accident occurs when there are no workers present, such as at night, there is a risk that water pipes will be shut off and a large amount of water will spill out, causing a secondary disaster.

This invention was made in view of the above-mentioned circumstances, and its purpose is to automatically detect changes in the flow velocity in water pipes when they are damaged due to natural disasters such as earthquakes or other accidents, and to By automatically shutting off the on-off valves installed on pipes, etc., even if water pipes are damaged due to natural disasters such as earthquakes or other accidents, water will not leak out when there are no workers at night or other times. It is an object of the present invention to provide a fluid pipe line interrupting device that can reliably prevent secondary disasters.

Hereinafter, the present invention will be described in detail based on one embodiment shown in the drawings.

FIG. 1 is a pneumatic circuit diagram of a fluid line disconnection device according to the present invention, and in the figure, ■ indicates a fluid line, and this fluid line 1
An on-off valve 3 is provided in which the pipe line 1 can be opened or closed by a valve body 2. As shown in FIG. 2, one end of a swinging arm 6, which is provided with a groove 5 having a square cross section in the longitudinal direction, is fixed to the end of the valve stem 4 of the on-off valve 3. A pin 11 implanted in the center of an actuator 90 having a cylinder 8 actuated by air pressure against a pressure spring 7 is slidably held in this groove 5 . As shown in FIG. 1, the cylinder 8 of the actuator 9 is connected to an air pump 13, which is a fluid source, by a pneumatic circuit via a pressure reducing valve 12'll-.

A main switching valve 14 is disposed in the pneumatic circuit between the pressure reducing valve 12 and the cylinder 80, and the main switching valve 14 is a three-point/two-position switching valve. The main switching valve 14 has a switching cylinder 14a.
The switching cylinder 14a is connected to the cutting switching valve 16 via the delay circuit 16', and the switching cylinder 14b, the U open return switching valve 15', and the pressure reducing valve 12
The air pump 13 is contacted via the air pump 13. The operation circuit 1 is connected to the air pump 13, the pressure reducing valve 12, the main switching valve 14, and the actuator 9 by a pneumatic circuit that connects them.
5 is formed.

The switching valve 16 is connected to the air pump 13VC via the pressure reducing valve 12'z. In addition, the cutting switching valve 16 has 3 ports (5
) This is a two-position switching valve that is switched by the displacement of a vane 17 disposed in the fluid pipe 1 and having a streamlined cross section.

FIG. 3 is a partially cutaway plan view of a sensor 18, which will be described later, and FIG. 4 is a sectional view taken along line II--II shown in FIG. 17 is fluid pipe line 1
It is attached to a swing shaft 19 that is installed through the pipe so that it can swing in a direction perpendicular to the tube axis direction.

A lever 22 having a pin roller 21 erected at one end of the protruding end 2OK of the swing shaft 19 that protrudes 111 from the fluid conduit 1 is fixed to the other end. The pin roller 21 is attached to a spring case 23 mounted on the outside of the fluid pipe line 1 as shown in FIG.
A suppression rod 25 slidably installed in a through hole 24 drilled in the
is brought into contact with the tip of the In addition, the suppression rod 25 has a stepped portion 26.
is provided, and an adjusting screw 2 is screwed into this step C6) and the end of the through hole 24.
A spring 28, which is an elastic means, is compressed between the pin roller 21k and the tip of the pin roller 21k, and presses the pin roller 21k against the roller arm 16a of the cutting switching valve 16 via the suppression rod 25. Therefore, the swinging of the lever 22 is limited by the pressing force of the spring 28, and the pressing force can be adjusted by the adjusting screw 27. A sensor 18 is formed by the blade 17, the lever 22, the pressing rod 25, the spring 28, the switching valve 16, and the like.

In addition, as shown in FIG.
an indicator circuit 29 which is activated by a change in the valve stem 19;
is provided, and the open/close state of the on-off valve 3 is displayed.

This invention has the above-described structure71)), and its operation is as follows: first, the blade 17 disposed in one circle of the fluid pipe shown in FIGS. 3 and 4 swings 111119 and lever 2.
Since its movement is restricted by the pressure rod 25 through the 2-@, under normal conditions, air is not sent from the cut-off valve 16 to the delay circuit 16' as shown in FIG. does not operate, switching cylinder 1
The air in the delay circuit 16' is discharged to the atmosphere. At this time, when the open/return switching valve 15"i is manually switched, air is sent from the air pump 13 through the open/return switching valve 15"i and into the switching cylinder 14b, the main switching valve 14 is switched, and the main switching valve Air is sent to the cylinder 8 through 14, and the on-off valve 3 is opened.

Next, when the fluid pipe 1 is damaged due to a natural disaster such as an earthquake or an accident, the flow velocity in the pipe 1 increases, and accordingly, the blade 17 shown in FIG. 4 moves to the suppression rod 25 shown in FIG. resist and displace. Due to this displacement, the cutting switching valve 16 is switched via the lever 22, and as shown in FIG. The air inside the cylinder 8 is released to the atmosphere from the open/reset switching valve 15', so the main switching valve 14 is switched and the air inside the cylinder 8 is released from the main switching valve 14 to the atmosphere, and the actuator 9 is activated to open/close. When the valve 3 is in the closed state, the fluid is completely prevented from flowing out.Also, although the delay circuit 16' is provided, the delay circuit 16 is closed only when the air from the cut-off valve 16 continues for a certain period of time or more. The purpose of this is to send air from ' to the switching cylinder 16a (9) to prevent the on-off valve 3 from closing due to a temporary increase in flow velocity during normal times.Q As described above, the pipe according to the present invention According to the road blocking device, even if water pipes are damaged due to a natural disaster such as an earthquake or an accident when there are no workers present, such as at night, the pipes will be completely closed, thereby preventing secondary disasters due to the outflow of large amounts of water. It is possible to reliably prevent IJ.''! , Once you set the
Since workers are not required most of the time, it has the effect of saving labor, and its utility value is remarkable.

[Brief explanation of the drawing]

Fig. 1 is a pneumatic circuit diagram of a pipe line interrupting device according to the present invention, Fig. 2 is a plan view showing a state in which the valve stem 1 shown in Fig. 1 and the rod lO are engaged, Fig. 3 II Fig. 1 11n) A plan view showing a part of the sensor 18 shown in FIG.
The figure is a cross-sectional view taken along the line ■--■ shown in FIG. 3, and FIGS. 5 and 6 are layout diagrams showing the operating state of the conduit interrupting device shown in FIG. 1. In the figure, 1 Fluid pipe line 3 Opening/closing valve 7 Pressing spring (elastic means) 9 Attachator 14 Main switching valve 15 Operation circuit 16 Cutting switching valve 16' Delay circuit 17 Vane (11); The lever 28 is a spring (elastic means). Patent applicant Shimizu Iron Works Co., Ltd. (12
) ν)

Claims (1)

[Scope of Claims] 1) An actuator that opens and closes an on-off valve disposed in a fluid pipeline using fluid pressure and elastic means, and an actuator disposed in a circuit that communicates this actuator with a fluid source. an operating circuit formed by a main switching valve that controls opening/closing operations; a sub switching valve that performs switching operations of the main switching valve; and a sensor formed by a vane for switching the auxiliary switching valve. 2) The blade is attached to a swing shaft that is swingably installed through the fluid pipe, the lever is mounted to a protruding end of the swing shaft that protrudes from the fluid pipe, and an elastic means for limiting the swinging of the lever due to the swinging; and *fMI.
Claim 1, wherein the sensor is formed with the auxiliary switching valve that is switched by the swinging of the M12 lever.
Fluid line isolation device l'l described in Section 1:. 3) The auxiliary switching valve is connected to the switching cylinder of the main switching valve via a delay circuit tl,! 1' A fluid line disconnection device i7t according to claim 1.