JPS6135447B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a time-limited seismic gas shutoff device, and its gist is that the seismic sensor is equipped with a device that can sense vibrations in both vertical and horizontal directions with one device. In addition to being able to extinguish fires by responding sensitively to various types of earthquakes, the combination of first and second double explosion-proof solenoid valves is installed in the route to block the gas introduction pipe. It is an object of the present invention to provide a device which can be used as a general gas appliance during normal times, and which can reliably extinguish fires in the event of an earthquake and prevent danger of raw gas blowing out by reopening the solenoid valve in the event of an earthquake.

The following will be explained with reference to the embodiments shown in the drawings. First,
The device of the present invention connects a parallel circuit of a first explosion-proof solenoid valve 1, which opens when the power switch S1 is turned on, and a second explosion-proof solenoid valve 2, which opens according to commands from the power switch S1 and the timer TM, in series to a power supply circuit. The power switch S1, the first explosion-proof solenoid valve 1, and the second explosion-proof solenoid valve 2
A normally open contact of the first relay 3 and a normally closed contact 6a of the second relay 5 connected to the seismic sensor 7 having an earthquake sensing capability are interposed in series between the first explosion-proof solenoid valve and the first explosion-proof solenoid valve. 1
and the second explosion-proof solenoid valve 2 directly into the path of the gas introduction pipe P.
Two are placed side by side in a row.

The normally open contact of the first relay 3 is located at a certain distance from the manual push button S2, which has a spring biased toward the normally open side and has a magnetic material at its tip. A normally open contact is placed opposite to an excitation coil that exerts an attractive force and maintains the closed state when the switch is pushed in and the power switch S1 is turned on.

In addition, the second relay 5 first has a coil spring 7a erected in an inclined manner so as to be able to swing freely in two directions, the vertical direction and the horizontal direction, a vibrating contact piece 7b is provided at the head end of the coil spring 7a, and a vibrating contact piece 7b is provided at the head end of the coil spring 7a. The vibration sensing device 7 is formed by surrounding the connecting terminal 7c in an annular manner. And this is the second
Connected in series to the relay 5, the contact between the vibrating contact piece 7b and the vibrating terminal 7c opens the relay contact 6a during an earthquake, and closes the first explosion-proof solenoid valve 1. Further, the second relay 5 has a normally open contact 6b connected in parallel with the seismic device 7, and is self-retaining even after being activated by contact between the vibrating contact piece 7b of the seismic device 7 and the vibrating terminal 7c during an earthquake. shall be.

Each circuit shown within the chain line in the drawing is isolated from the gas introduction pipe P for safety and is hermetically cased.

Note that 4 is a transformer provided in the circuit of the seismic device 7, and 8 is a warning buzzer that sounds when the seismic device 7 is activated.

The device of the present invention is configured as described above,
The operating conditions and effects will be explained below for normal use as a gas appliance, and during and after an earthquake.

(1) During normal use Insert the plug into AC100V and turn on the power switch S.
1 and press the manual pushbutton S2 to open the gas valve and set the timer TM at the scheduled time. Then, when the power switch S1 is turned on, the first explosion-proof solenoid valve 1 is opened, and the normally open contact of the first relay 3 and the normally closed contact 6 of the second relay 5 are closed.
A is also in a closed state. Therefore, the second explosion-proof solenoid valve 2 opens and closes in response to the commands from the timer TM, and by igniting the gas, the appliance can be used as a normal gas appliance.

(2) During an earthquake If an earthquake occurs during the gas ignition in step 1, the earthquake sensing device 7 connected to the second relay 5 will
The vibrating contact piece 7b at the head end of the coil spring 7a erected in an inclined manner swings and comes into contact with the contact terminal 7c formed in an annular manner surrounding the vibrating contact piece 7b, and the second relay 5
The normally closed contact 6a is opened, that is, the first explosion-proof solenoid valve 2 and the second explosion-proof solenoid valve 3 are closed, and the gas supply is immediately stopped to extinguish the fire.

At this time, since the coil spring 7a is erected in an inclined manner, the seismic vibration force is resolved into vertical and horizontal directions along the inclination. In other words, if there is vertical shaking,
Part of the vertical vibration is converted to horizontal vibration, and when there is horizontal shaking, part of the horizontal vibration is converted to vertical vibration, so it is easy to shake the spring regardless of whether there is a vertical or horizontal earthquake. By inducing a dynamic movement, the second relay 5 can respond sharply to any earthquake and extinguish the fire.

(3) After the earthquake is over Next, when the shaking of the earthquake increases and the vibrating contact piece 7b of the earthquake sensing device 7 separates from the connecting terminal 7c,
If left as is, there is a risk that the normally closed contact 6a of the second relay 5 will automatically return and raw gas will blow out, but since the normally open contact 6b is connected in parallel to the normally closed contact 6a, the normally open contact 6a Avoid this danger by self-holding in the open state. (Normally closed contact 6a of second relay 5
The normally open contact 6b returns to the reset state when the power switch S1 is turned off. ) Also, if there is a power outage during an earthquake, the first explosion-proof solenoid valve 2 and the second explosion-proof solenoid valve 3 will naturally
However, if there is a power outage when the timer TM is set and the power is turned on after the power outage is canceled, the first explosion-proof solenoid valve 2 and the second explosion-proof solenoid valve 2 will be closed.
The explosion-proof solenoid valve 3 becomes open, and there is a risk of raw gas blowing out as described above. However, in the present invention, the first relay 3 includes a manual push button S2 whose normally open contact has a spring biased toward the normally open side and a magnetic material at the tip, and a manual push button S2 that is placed at a certain distance from the push button S2. A normally open contact is placed in opposition to an excitation coil that exerts an attractive force and maintains the closed state when the push button S2 is pressed and the power switch S1 is turned on. Therefore, once there is a power outage, the attractive force of the excitation coil disappears and the push button S2 is opened by the biasing force of the spring, and even if the power is re-energized after the power outage is canceled, the manual push button S remains open.
2 and the excitation coil are spaced apart from each other by a certain distance, so the opening is maintained without immediately returning to the closed position until the manual push button S2 is pressed. Therefore, it is possible to maintain the closed state of the first explosion-proof solenoid valve 2 and the second explosion-proof solenoid valve 3, and avoid the danger of raw gas generation.

〓〓〓〓
As described above, the device of the present invention has a relatively simple structure, can respond sharply to any vibration earthquake, and can immediately extinguish gas appliances. This invention is advantageous in that it can be used as a device and can also reliably eliminate the risk of subsequent raw gas blowing out.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an electric circuit diagram of the entire device, and FIG. 2 is a plan view of essential parts showing the earthquake sensing device. S1...Power switch, S2...Manual push button, 1
...First explosion-proof solenoid valve, 2...Second explosion-proof solenoid valve, 3
...First relay, 5...Second relay, 6a...Normally closed contact, 6b...Normally open contact, 7... Earthquake sensing device, 7a
...Coil spring, 7b...Vibration contact piece, 7c...
Connecting terminal. 〓〓〓〓

Claims (1)

[Claims] 1. A parallel circuit of a first explosion-proof solenoid valve 1 that opens when the power switch S1 is turned on and a second explosion-proof solenoid valve 2 that opens when the power switch S1 and the timer TM are commanded is connected in series to the power supply circuit. A second relay is connected between the power switch S1, the first explosion-proof solenoid valve 1, and the second explosion-proof solenoid valve 2, and the normally open contact of the first relay 3 and the seismic device 6 equipped with earthquake sensing capability are connected. A gas stop device in which a normally closed contact 6a is interposed in series, and two of the first explosion-proof solenoid valve 1 and the second explosion-proof solenoid valve 2 are arranged in parallel in series in the path of the gas introduction pipe P, The normally open contact of the first relay 3 is a manual push button S that has a spring biased toward the normally open side and has a magnetic material at its tip.
2 and push button S2 at a certain distance from that push button S2.
It is a normally open contact with an excitation coil that exerts an attractive force and maintains the closed state when pressed in and the power switch S1 is turned on. It is connected in series with the vibration sensing device 7 formed by providing a vibration contact piece 7b and surrounding it in an annular manner with a connecting terminal 7c, and is activated by contact between the vibration contact piece 7b of the vibration sensing device 7 and the vibration terminal 7c during an earthquake. A timed seismic gas stop device characterized in that the normally open contact point 6b is connected in parallel with the earthquake sensing device 7 so as to be self-maintained.