JPH0953738A - Emergency shut-off system for water receiving tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an emergency shut-off system for a water receiving tank to ensure drinking water in the water receiving tank provided in a school, pubric institution and the like as a refuge in a disaster for storing temporarily tap water. SOLUTION: Emergency shut-off valves 6, 7 are disposed respectively in pipe lines 4, 5 to afford communication between an inflow port 2 and outflow port 3 of a water receiving tank 1. In a power supply circuit to hold these emergency shut-off valves 6, 7 closed automatically in a power failure and opened in the current carrying time is interposed a vibration sensor 16 to shut off this power supply circuit when an earthquake having at least the predetermined seismic coefficient is sensed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to drinking water in a receiving tank for temporary storage of tap water provided in schools, public facilities, etc., which are evacuation shelters in the event of a disaster, such as an earthquake. Occasionally, it relates to an emergency shutoff system for a water tank to ensure safety.

[0002]

2. Description of the Related Art In order to prepare for a disaster such as an earthquake, a water tank for temporarily storing tap water is installed in an elementary school or on the premises of a public facility such as a public hall for emergency use in the event of a disaster. Things are being done.

[0003]

By the way, conventionally, the outflow of water due to the breakage of the water passage and the intrusion of red water and sewage into the receiving tank at the time of unpredictable disaster such as earthquake and landslide are prevented. The system is not always in place, so there is an urgent need to establish means to secure sanitary drinking water.

[0004]

According to the present invention, an emergency shutoff valve is provided at each of the water inlet and outlet water passages of a water receiving tank, and these emergency shutoff valves are automatically closed at the time of power failure when energized. We proposed an emergency shut-off method for a water tank, which was characterized by the installation of a seismic shock absorber that shuts off the power circuit when it detects an earthquake with a seismic intensity greater than or equal to a predetermined level in the power circuit that is held open. In the meantime, when the emergency shutoff valve is provided with a means for accumulating an operating force for closing it in the event of a power failure when it is opened by energization, or when a predetermined seismic acceleration is applied to the seismic sensor. The steel ball falls from the ball receiver and the switch is operated to shut off the power supply circuit.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the relationship between a water receiving tank 1 and emergency shutoff valves 6 and 7 arranged in water passages 4 and 5 at an inlet 2 and an outlet 3 of the water receiving tank 1. It is a conceptual diagram showing these emergency cutoff valves 6 and 7 in an enlarged manner, and a power supply circuit is connected to these emergency cutoff valves 6 and 7 from a power source 11 via a seismic sensor 16 described later. Next, one form of these emergency shutoff valves 6 and 7 will be described with reference to FIG.

In FIG. 2, reference numeral 8 is a valve portion of a type such as a ball valve, and 9 is an actuator portion for opening and closing a valve body incorporated in the valve portion 8. The outline of the operation will be described with reference to FIG.

In FIG. 3, reference numeral 10 is a motor. When the motor 10 is rotated by turning on the switch 12 from the power source 11, the valve body 1 of the valve portion 8 is passed through the speed reducing means 13.
Simultaneously with the rotation of 4 into the open state, the force accumulating means 15 for accumulating the operating force for closing the valve body 14 via the decelerating means 13 is operated. As a result, the power source 1
When the current from No. 1 is cut off, the valve body 14 can be closed by the force accumulating means 15.

As the force accumulating means 15 for accumulating the operating force for closing the valve body 14, mechanical means such as spring hoisting, means utilizing fluid pressure, and any other electrical or electromagnetic means. It is possible to use energy storage means.

FIG. 4 and FIG. 5 show a steel ball drop type seismic sensor 16 as an example of the seismic sensor, and as shown in FIG. 4, a ball receiver having a steel ball 17 set in a stable state. When a push rod 20 which is linked with a ball tray 19 formed around 18 is in contact with a motion lever 22 of a switch 21, and when a seismic acceleration of 100 to 170 gal corresponding to a seismic intensity of 5 is detected, The steel ball 17 falls on the bowl pan 19,
Along with this, the operation lever 22 is pushed down to the position indicated by the solid line in FIG. 5 through the push rod 20 to operate the switch 21, and the reset button 23 is used for resetting the operation lever 22. By returning to the old position shown by the imaginary line of 5, the push rod 20 is pushed up, and the steel ball 17 can be returned from the ball tray 19 onto the ball receiver 18 accordingly.

Next, referring to the wiring system diagrams of the power supply circuit shown in FIG. 6 to FIG.
The operating states of the two emergency shutoff valves 6 and 7 will be described.

First, FIG. 6 shows a state in which the seismic sensor 16 is not operating and the emergency shutoff valves 6 and 7 are in the opening operation, and the switch 21 of the seismic sensor 16 is in the normally ON c-b. The relays 26 are connected to each other, and the relay 26 is actuated by the energization from the power source 11, and the switches 12, 12 to the emergency shutoff valves 6, 7 are turned on. Since the operation of each of the emergency shutoff valves 6 and 7 is exactly the same in each operation stage, only the emergency shutoff valve 6 on the inflow side will be described for simplification.

From the time of resetting the seismic sensor 16 to the time of full opening of the valve, the contact c-b of the switching valve 27 is in the ON state, whereby the motor 10 has the valve body 14 in the fully open state. Rotate until.

When the valve is fully opened, the switching valve 2 as shown in FIG.
The contact c-a of 7 is connected, and the circuit maintains the self-holding state.

Next, when the seismograph 16 senses an earthquake with a predetermined seismic intensity or higher, the switch 21 is turned on during operation.
Switching to a and shutting off the current from the power supply, the relay 26 becomes inoperative and the switch 12 also turns off.
Since the motor 10 is activated, the motor 10 is not energized, and the valve body 14 is rotated toward the fully closed state by the action of the means 15 at this time. At this time, the states of the respective parts are the same during the valve closing operation (FIG. 8) and the fully closed state (FIG. 9).

In the above description, the operation of closing the valve due to the detection of an earthquake was explained. However, the operation of fully closing the valve is performed in the same manner even in the case of a power failure. In case of, the resetting operation of the seismic sensor 16 is required, whereas in case of power failure, such operation is not required.

[0016]

EFFECTS OF THE INVENTION By adopting the system having the above-described structure of the present invention, it is possible to prevent the outflow of water from the water receiving tank and the intrusion of red water and sewage into the water receiving tank due to the occurrence of an earthquake. There are many things that contribute to securing drinking water in the aquarium.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a relationship between a water receiving tank and an emergency shutoff valve.

FIG. 2 is a view showing one form of an emergency shutoff valve.

FIG. 3 is a schematic diagram of an actuator portion of the emergency shutoff valve.

FIG. 4 is a diagram showing a state of an example of a seismic sensor when the seismic sensor is inoperative.

FIG. 5 is a diagram showing an operating state of the seismoscope shown in FIG.

FIG. 6 is a wiring system diagram showing a state during a valve opening operation of the emergency shutoff valve.

FIG. 7 is a wiring system diagram showing a state where the emergency shutoff valve is fully opened.

FIG. 8 is a wiring system diagram showing a state during a valve closing operation of the emergency shutoff valve.

FIG. 9 is a wiring system diagram showing a state where the emergency shutoff valve is fully closed.

[Explanation of symbols]

 1 Water receiving tank 2 Inlet 3 Outlet 4,5 Water passage 6,7 Emergency shutoff valve 10 Motor 11 Power supply 14 Valve body 15 Energy storage means 16 Seismic sensor 17 Steel ball 18 Ball receiving 21 Switch

Claims (3)

[Claims] 1. An emergency shutoff valve is provided in each of the water passages of the inlet and the outlet of the water receiving tank, and the emergency shutoff valve that is automatically closed in the event of a power failure is held in a power supply circuit that is kept open when energized. An emergency shutoff system for a water tank, which is equipped with a seismic sensor that shuts off the power supply circuit when an earthquake above the seismic intensity is detected. 2. The water receiving tank according to claim 1, wherein the emergency shutoff valve is provided with a means for accumulating an operating force for closing the emergency shutoff valve when it is opened by energization. Emergency shutoff method. 3. A seismoscope of the type wherein a steel ball falls from a ball receiver when a predetermined vibration acceleration is applied and a switch is operated to cut off the power supply circuit. The emergency shutoff system for a water tank according to claim 1.