JPH0436209B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is designed to send water by siphon action through a siphon pipe to a water pipe that carries water to a water distribution reservoir, a water distribution tank, etc. The present invention relates to an emergency shut-off method for water pipes and a device therefor, which detects breakage and leakage of water in a water pipe at an early stage, quickly stops the siphon action, and shuts off water supply.

[Conventional technology]

When water in a water distribution reservoir is sent from a water pipe through a water pipe, when a water leak occurs due to a breakage accident in the water pipe, conventionally, as shown in Fig. A detector 23 that detects the flow rate and flow rate is provided, and a detection signal from this detector 23 is sent to an opening/closing machine 25 that opens and closes an emergency shutoff valve or quick closing gate 24 provided in the water pipe 22, and this opening/closing machine 25 is The valve or gate 24 was then actuated to close the valve or gate 24 for emergency shutoff.

[Problem that the invention seeks to solve]

However, when using such a method and device, the emergency shutoff valve or quick-closing gate 2
It takes considerable force and weight to completely close 4.
In addition, considerable strength was required for the shutoff valve and the gate 24.

Therefore, the present invention uses a siphon pipe to convey water, and in the event of an emergency when the pipe is broken, air is supplied to the top of the siphon pipe to stop the siphon action, without requiring the conventional emergency shutoff valve or quick closing gate to shut off. It is an object of the present invention to provide an emergency shut-off method for water pipes and a device therefor, which can easily and reliably shut off water supply.

[Means for solving problems]

In order to achieve the above object, the first invention provides an emergency shutoff method for a water flow pipe, in which water in a water distribution reservoir is sent via a siphon pipe to a small chamber provided around the water flow pipe, and the water is sent from the small chamber through the water flow pipe. There was no such thing,
An air supply valve at the top of the siphon pipe that uses a float to detect an abnormal drop in water level in a small chamber caused by water leakage when a water pipe is damaged, and is activated when the float descends from a predetermined position. The siphon pipe is opened to draw air into the siphon pipe, and the water supply is cut off.

Moreover, the emergency shutoff device for water flow pipes according to the second invention includes:
An apparatus for carrying out the method of the first invention,
In a water conveying device configured to convey water from a water distribution reservoir through a water pipe, a small chamber of a weir higher than the high water level of the water distribution reservoir is provided around the water outlet of the water flow pipe, and water is distributed across this weir. A siphon pipe is arranged to send the water in the pond to the small chamber in an amount equal to the amount of water flowing through the water pipe, and an exhaust device and an air supply valve that is opened and closed by the operation of a lever are installed at the top of the siphon pipe.
In addition, a float is provided in the small chamber that moves up and down as the water level in the small chamber fluctuates, and this float and the lever for operating the air supply valve are connected by a rope of a predetermined length, so that the float prevents pipe damage, water leakage, etc. When the siphon is lowered from a predetermined position, the lever is actuated to open the air supply valve and supply air into the siphon pipe.

〔Example〕

The apparatus and method used in the present invention will be explained below based on FIG.

The water distribution reservoir 1 is a water distribution reservoir to which a predetermined amount of water is supplied through an inflow pipe (not shown), and a water flow pipe 2 for sending water is provided at the lower part of the water supply reservoir 1. is provided with an on-off valve 4 that is opened and closed by a switch 3 provided at the upper part of the water distribution reservoir 1.

A small chamber 1 surrounded by a weir 5 which is higher than the high water level of the water distribution reservoir 1 is located around the water inlet 2a of the water conduit 2.
A is formed, and the inside of the water distribution reservoir 1 is divided into a small room 1a and a large room 1b.

A pipe 6 communicating between the large chamber 1b and the small chamber 1a is provided at the lower part of the weir 5 forming the small chamber 1a, and this tube 6 is opened and closed by a switch 7 provided at the upper part of the water distribution reservoir 1. An on-off valve 8 is provided. In addition, above the weir 5, one end 9a is located on the large room 1b side below the low water level position of the water distribution reservoir 1 by straddling the weir 5, and the other end 9b is located on the small room 1a side at the low water level position of the water distribution reservoir 1. A siphon pipe 9 opened further downward is arranged. The diameter of the siphon pipe 9 is set to allow approximately the same amount of water to flow through the water passage pipe 2.

An exhaust pipe 12 equipped with an exhaust valve 10 and an exhaust pump 11 for creating a negative pressure inside the siphon pipe 9 is connected to the top 9c of the siphon pipe 9, and an air supply pipe 12 for supplying air into the siphon pipe 9 is connected. A valve 13 is provided.

The air supply valve 13 is adapted to supply air when pulled upward, and is moved up and down about a support shaft inserted through a bracket 14 protruding from the top 9c of the siphon tube 9. A rope 16 having a length at least slightly below the low water level of the water reservoir 1 is attached to the other end 15b of the lever 15. Small room 1a
A float 17 is attached to the side that moves up and down as the water level changes.

Therefore, when a breakage accident occurs in the water pipe 2, the amount of water flowing out due to the breakage and leakage increases, and the small room 1
When the water level in a rapidly decreases, the float 17 descends, and when it descends to the set position (a position below the low water level position), the rope 16 is stretched;
is pulled, the end 15b of the lever 15 is lowered, rotated about the fulcrum, and one end 15a is raised, opening the air supply valve 13 locked thereto. As a result, air is supplied into the siphon pipe 9, so that the siphon action can be stopped and water supply can be cut off.

In the device configured as described above, when water is to be conveyed, first, the opening/closing valve 8 is opened by the opening/closing machine 7 to send water in the large chamber 1b of the water distribution reservoir 1 into the small chamber 1a through the pipe 6. Water is filled to at least the low water level of the water distribution reservoir 1, and the opening of the end 9b of the siphon pipe 9 on the side of the small chamber 1a is closed. After doing this, the opening/closing valve 8 is closed, and then the exhaust valve 10 is opened and the air inside the siphon tube 9 is removed from the exhaust pipe 12 by the exhaust pump 11, so that the inside of the siphon tube 9 is brought into a negative pressure state.

Then, water is sucked up into the siphon pipe 9 and becomes filled with water. After this, when the on-off valve 4 is opened by the on-off machine 3, the inside of the large chamber 1b of the water distribution reservoir 1 is filled by the siphon action. The water is sent through the siphon pipe 9 to the downstream water passage pipe 2 for water supply. At this time, since the pipe diameters of the siphon pipe 9 and the water flow pipe 2 are set so that approximately the same amount of water flows through the water flow pipe 2, the amount of water sent from the water flow pipe 2 is always controlled by the siphon pipe 9 into the small chamber 1a. The water level in the small chamber 1a is always kept substantially constant.

However, if a breakage accident occurs in the downstream water pipe 2, abnormal water leakage occurs, which causes the water level in the small chamber 1a to drop rapidly. However, when the float 17 descends to a predetermined position due to an abnormal drop in the water level in the small chamber 1a of the lever, the rope 16 is tightened, which pulls the end 15b of the lever 15 and lowers it, causing one end 15a to rise. Then, the air supply valve 13 is opened and air is supplied into the siphon pipe 9, stopping the siphon pipe action and cutting off water supply.

When water is to be fed again, the on-off valve 4 is closed and the on-off valve 8 is opened to fill the small chamber 1a with water to a low water level so as to close at least the opening of the end 9b of the siphon pipe 9. Then, the float 17 rises, the rope 16 becomes slack, and the air supply valve 13 is closed.
The inside of the siphon tube 9 may be brought to negative pressure, and the above operation may be repeated.

In addition, in this embodiment, an emergency shutoff was described in the event of a breakage accident occurring in the water pipe 2, but for example, when it is necessary to stop water supply due to the occurrence of an earthquake, earthquake detectors and exhaust pipe 12
An electrically driven air supply valve 13a provided on the branched pipe 12a is electrically connected, and when an earthquake is detected, the air supply valve 13a is opened to supply air to the top 9c of the siphon pipe 9. It is also possible to stop the siphon action. Air supply valve 1
3a is not limited to an electric drive system, but may be an electrically interlocked drive system such as a pneumatic or hydraulic cylinder system.

〔Effect of the invention〕

As described above, the method and device of the present invention provide a small chamber in a water distribution reservoir, and arrange a siphon pipe across the small chamber, and transport water in the water distribution reservoir through the siphon pipe, the small chamber, and the water flow pipe. When a breakage accident occurs in the water pipe, a float detects an abnormal drop in the water level in the small chamber, opens the air supply valve linked to it, supplies air to the siphon pipe, stops the siphon action, and supplies water. There is no need to use emergency shut-off valves or quick-close gates installed in water pipes, which require strength, as in the past. By using a siphon pipe, the structure is simple and Water supply can be shut off reliably and easily in an emergency.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional front view showing one embodiment of the device of the present invention, and FIG. 2 is a cross-sectional front view of a conventional emergency cut-off device. 1... Water reservoir, 1a... Small room, 1a... Large room,
2...Water pipe, 3,7...Opening/closing machine, 4,8...
Opening/closing valve, 5... Weir, 6... Pipe, 9... Siphon pipe, 10... Exhaust valve, 11... Exhaust pump, 12... Exhaust pipe, 13... Air supply valve, 15
...Lever, 16...Rope, 17...Float.

Claims (1)

[Scope of Claims] 1 Water in a water distribution reservoir is sent via a siphon pipe to a small chamber provided around a water flow pipe, and from the small room the water is sent through the water flow pipe, so that when damage occurs to the water flow pipe, , A float detects an abnormal drop in water level in a small chamber caused by water leakage, and when the float descends from a predetermined position, the air supply valve at the top of the siphon pipe is opened in conjunction with this, and air is sucked into the siphon pipe. An emergency method for shutting off a water pipe, characterized in that the water supply is cut off. 2. In a water conveying device configured to transport water within a water distribution reservoir through a water pipe, a small chamber of a weir higher than the high water level of the water distribution reservoir is provided around the water outlet of the water flow pipe, and A siphon pipe is arranged to send the water in the distribution reservoir to the small chamber in the same amount as the amount of water flowing through the water pipe, and an exhaust device and an air supply valve that is opened and closed by the operation of a lever are installed at the top of the siphon pipe, and inside the small chamber. A float that moves up and down as the water level changes in the small chamber is provided, and this float and the lever for operating the air supply valve are connected by a rope of a predetermined length, so that the float can be moved to a predetermined position due to a pipe breakage, water leakage, etc. An emergency shutoff device for a water flow pipe, characterized in that when the siphon pipe is lowered further down, the lever is actuated to open an air supply valve and supply air into the siphon pipe.