JPH049946B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention detects changes in the flow velocity within a fluid pipe such as a water pipe when it is damaged due to a natural disaster such as an earthquake or other accident. The present invention relates to a fluid line cutoff device that automatically cuts off a line.

[Conventional technology]

Conventionally, when a water pipe is damaged due to a natural disaster such as an earthquake or an accident, a worker senses the change and then shuts off the on-off valve attached to the water pipe. It is.

[Problem to be solved by the invention]

However, if there is a natural disaster such as an earthquake or an accident when there are no workers present, such as at night, there is a risk that water pipes will be delayed and a secondary disaster may occur due to the large amount of water that leaks out.

[Means to solve the problem]

This invention has been made in view of the above-mentioned circumstances, and includes an on-off valve 3 that can open and close the fluid pipe line 1, and a cylinder 8 of an actuator 9 that opens and closes the on-off valve 3. ’ inside is the pressure reducing valve 12
communicates with a pressure fluid source 13 via the pressure reducing valve 1
2 and the cylinder 8', the main switching valve 14 is a 3-port, 2-position switching valve, and has switching cylinders 14a and 14b for allowing the switching valve to take each position. , normally, the switching cylinder 14b is opened to the atmosphere, and the pressure fluid source 13 is switched to the switching cylinder 14b by manual switching.
and a three-port, two-position switching valve that opens the delay circuit 16' to the atmosphere in the first position and connects the pressure fluid source 13 to the delay circuit in the second position. 16', and a delay circuit 1 that supplies air to the switching cylinder 14a with a time delay when the secondary switching valve 16 communicates with the pressure fluid source 13.
6', and the auxiliary switching valve 16 is configured to be switched by displacement of a vane 17 disposed in the fluid pipe 1, thereby preventing damage to the fluid pipe 1. Sometimes, along with the displacement of the blade 17,
The auxiliary switching valve 16 is switched, and air is sent from the auxiliary switching valve 16 to the switching cylinder 14a of the main switching valve 14 through the delay circuit 16'. ′
The air inside is discharged from the main switching valve 14 to the atmosphere, and the actuator is actuated to open the on-off valve 3.
This paper proposes a fluid line blocking device that prevents fluid from flowing out by closing the pipe.

[Effect]

With the above-described device of the present invention, when a water pipe, etc. is damaged due to a natural disaster such as an earthquake or other accident, the change in the flow velocity in the pipe is automatically detected, and the on-off valve attached to the water pipe, etc. This system can automatically shut off water, and even if water pipes are damaged due to natural disasters such as earthquakes or other accidents, especially when there are no workers present, such as at night, the system can reliably prevent water from flowing out. This can prevent secondary disasters.

〔Example〕

The present invention will be described in detail below based on the accompanying drawings.

FIG. 1 is a pneumatic circuit diagram of a fluid line disconnection device according to the present invention, and FIGS. 5 and 6 are details of a valve and a valve drive section operated by this pneumatic circuit. In these figures 1, 5, and 6, 1
indicates a fluid pipe line, and this fluid pipe line 1 includes:
An on-off valve 3 that can open or close the pipe line 1 by means of a valve body 2 is provided. 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. In this groove 5, a pin 11 is installed in the center of a rod 10 of an actuator 9 equipped with a piston 8 that is actuated by air pressure against a pressure spring 7.
are slidably engaged. As shown in FIG. 1, the inside of the cylinder 8' of the actuator 9 is connected via a pressure reducing valve 12 to an air pump 13, which is a source of pressure fluid, through a pneumatic circuit. In the pneumatic circuit between the pressure reducing valve 12 and the cylinder 8', there is a main switching valve 14.
The main switching valve 14 is a three-port, two-position switching valve. The main switching valve 14 includes switching cylinders 14a and 14b, one switching cylinder 14a is connected to the sub switching valve 16 via a delay circuit 16', and the other switching cylinder 14a is connected to the sub switching valve 16 via a delay circuit 16'.
b is connected to the air pump 13 via the open/reset switching valve 15' and the pressure reducing valve 12. An operation circuit 15 is formed by the air pump 13, pressure reducing valve 12, main switching valve 14, actuator 9, and a pneumatic circuit connecting these. Said sub-switching valve 1
6 is connected to an air pump 13 via a pressure reducing valve 12. The auxiliary switching valve 16 is a three-port, two-position switching valve, and is switched by the displacement of a vane 17 disposed in the fluid pipe line 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 the - line shown in FIG.
7 is attached to a swing shaft 19 that extends through the fluid pipe line 1 so as to be swingable in a direction perpendicular to the pipe axis direction of the fluid pipe line 1 . The other end of a lever 22 having a pin roller 21 erected at one end is fixed to a protruding end 20 of the swing shaft 19 that protrudes from the fluid conduit 1 . As shown in FIG. 3, the pin roller 21 has a through hole 24 formed in a spring case 23 attached to the outside of the fluid conduit 1.
It comes into contact with the tip of a pressing rod 25 that is slid inside. Further, the pressing rod 25 is provided with a stepped portion 26, and a spring 28, which is an elastic means, is compressed between the stepped portion 26 and the tip of an adjusting screw 27 screwed to the end of the through hole 24. Pressing rod 25
The pin roller 21 is pressed against the roller arm 16a of the auxiliary switching valve 16 via the pin roller 21. 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. And the blade 17, the lever 22,
Pressing rod 25, spring 28, sub-switching valve 16
The sensor 18 is formed by the above.

As shown in FIG. 1, the pipe line breaking device according to the present invention is equipped with a display circuit 29 that is activated by changes in the valve stem 19, and displays the open/closed state of the on-off valve 3. ing.

Since the present invention has the above-described structure, first of all, the blade 17 disposed in the fluid pipe line 1 shown in FIGS.
9 and the lever 22, and its movement is restricted by the pressing rod 25, so that under normal conditions, air is not sent from the auxiliary switching valve 16 to the delay circuit 16' as shown in FIG. Therefore, the delay circuit 16' is not activated, and the air in the switching cylinder 14a is discharged from the delay circuit 16' to the atmosphere. At this time, when the open/return switching valve 15' is manually switched, air flows from the air pump 13 through the open/return switching valve 15' to the switching cylinder 14b.
The main switching valve 14 is switched, air is sent to the cylinder 8 through the main switching valve 14, and the on-off valve 3 is opened.

At this time, the open/return switching valve 15' returns to its original position after the manual operation is completed, and air is discharged into the switching cylinder 14b through the open/return switching valve 15'.

Next, if 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 the blade 17 shown in FIG. 4 changes to the shape shown in FIG. It is displaced against the pressure rod 25 shown. Due to the displacement, the auxiliary switching valve 1 is
6 is switched, and as shown in FIG. is the main switching valve 14
Then, the actuator 9 is operated, the on-off valve 3 is closed, and the outflow of the fluid is completely prevented. The reason why the delay circuit 16' is provided is that air is sent from the delay circuit 16' to the switching cylinder 16a only when the air from the auxiliary switching valve 16 continues for a certain period of time. This is to prevent the on-off valve 3 from closing due to an increase in flow velocity.

〔Effect of the invention〕

As described above, according to the conduit breaking device according to the present invention, when there is no worker at night etc.
Even if water pipes are damaged due to a natural disaster such as an earthquake or an accident, the pipes can be automatically closed, reliably preventing secondary disasters due to large amounts of water leaking out. If the system is installed, there will be almost no need for workers after that, so it will have the effect of saving labor, and its utility value is remarkable.

[Brief explanation of drawings]

FIG. 1 is a pneumatic circuit diagram of a pipe line breaking device according to the present invention, FIG. 2 is a plan view showing the state of engagement between the valve stem and rod shown in FIG. 1, and FIG. FIG. 4 is a cross-sectional view taken along the - line shown in FIG. 3, and FIGS. 5 and 6 are plan views showing the pipe line shown in FIG. 1. FIG. 3 is a layout diagram showing the operating state of the shutoff device. In the figure, 1...Fluid pipe line, 3...Opening/closing valve, 8'...Cylinder, 9...Actuator,
13... Air pump (pressure fluid source), 14... Main switching valve, 14a, 14b... Switching cylinder, 1
5... Operating circuit, 16... Sub-switching valve, 16'...
Delay circuit, 17... is a blade.

Claims (1)

[Claims] 1. An on-off valve 3 that can open and close the fluid pipe line 1 is disposed in the fluid pipe line 1, and the inside of the cylinder 8' of the actuator 9 that opens and closes the on-off valve 3 is connected to the pressure fluid source 13 via the pressure reducing valve 12. This pressure reducing valve 12
and a main switching valve 14, which is a three-port, two-position switching valve, in the pneumatic circuit between the cylinder 8' and the cylinder 8', and has switching cylinders 14a and 14b disposed therein for causing the switching valve to take each position; Normally the switching cylinder 1
4b to the atmosphere and communicates the pressure fluid source 13 with the switching cylinder 14b by manual switching; a 3-port, 2-position switching valve, in a first position; a sub-switching valve 16 which opens the delay circuit 16' to the atmosphere and communicates the pressure fluid source 13 with the delay circuit 16' in a second position; a delay circuit 1 that supplies air to the switching cylinder 14a with a time delay;
6', and the auxiliary switching valve 16 is configured to be switched by displacement of a vane 17 disposed in the fluid pipe 1, thereby preventing damage to the fluid pipe 1. Sometimes, along with the displacement of the blade 17,
The auxiliary switching valve 16 is switched, and air is sent from the auxiliary switching valve 16 to the switching cylinder 14a of the main switching valve 14 through the delay circuit 16'. ′
The air inside is discharged from the main switching valve 14 to the atmosphere, and the actuator is actuated to open the on-off valve 3.
A fluid pipe blocking device that prevents fluid from flowing out by closing the pipe.