JPS6141002Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a gas cutoff device that is installed at an appropriate location in a gas piping path and shuts off the gas flow path at a necessary time. This invention relates to a device that closes the valve port of a piping path and shuts off gas.

In recent years, there have been a number of gas explosions in underground malls and homes. Needless to say, such gas explosions have disastrous consequences not only for the gas explosion site, but also for local residents. Under these circumstances, gas leak alarms and the like have recently become popular. However, with only gas leak alarms, if someone is present when the gas leak detector activates, it is possible to prevent a gas explosion accident by closing the gas valve or lock, but if no one is present, then a gas explosion can be prevented. When a person forgets to close his or her coin,
Gas explosion accidents cannot be prevented.

Recently, various types of fire extinguishing equipment have become popular due to social demand. For example, in kitchen fire extinguishing systems, when a fire occurs, when a fire extinguishing agent is released, the flame of the gas range is extinguished by the extinguishing agent, and the raw gas is extinguished. may be released, resulting in a secondary explosion hazard.

Therefore, it has become necessary to engage gas shut-off devices when a gas leak alarm detects a gas leak or when a fire extinguishing system releases an agent.

Some gas shutoff devices, which have recently been widely adopted, utilize solenoid valves to shut off gas flow paths by operating the solenoid valves. This type of gas cutoff device employs a system in which electricity is always applied to excite the solenoid valve and keep it open, and in the event of an abnormality, the solenoid valve is closed by cutting off the current. Therefore,
Such a gas cutoff device has the disadvantage that the excitation current is deenergized and the valve closes even during a power outage. Furthermore, there is no structure to prevent the risk of accidentally opening the blocked gas flow path after the gas shutoff device is activated, and the restoration work itself is extremely dangerous and requires a high level of expertise. There are some items that require additional work.

The purpose of the present invention is to eliminate the drawbacks of the conventional gas cutoff devices described above, and to be able to reliably cut off the gas flow in the gas piping line at the required time by linking with the gas leak signal or the fire occurrence signal of the fire extinguishing equipment. The objective is to provide a gas cutoff device that can. A further object of the present invention is to provide a gas cutoff device that prevents the gas passage from being erroneously opened after the device is activated, and that allows for safe and easy recovery work. The present invention also provides a gas cutoff device having a display section that allows it to be determined at a glance from the outside whether the gas cutoff device is opening or closing the valve port of the gas piping path.

That is, according to the present invention, in a gas cutoff device that is provided at an appropriate location in a gas piping path and shuts off the gas flow path at a necessary time, the gas cutoff device includes a valve port formed in the gas piping path, and a valve that opens and closes the valve port. a retaining pin that engages the valve body and holds the valve body in the valve open position against the spring biasing force of a valve closing bias spring; a piston that is held in a fixed position and can slide in the direction of the valve body in response to a pressing force; and a gas generator that is attached to the cylinder and applies a pressing force to the piston when necessary. , there is provided a gas cutoff device characterized in that the holding pin releases the valve open holding state according to the sliding of the piston, and the holding pin holds the valve open while the valve is held open. The holding pin itself may be provided with a display portion that displays the valve closed state when the open holding state is released.

Since the gas cutoff device of the present invention having the above-mentioned configuration does not use a solenoid valve, there is no need to constantly supply electricity to open the valve, and thus it has the effect of saving power and avoiding the cause of fire due to burnout of the excitation coil. Furthermore, since the valve is held open by mechanical engagement between the holding pin and the valve body, it also has the advantage of high earthquake resistance. Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

Fig. 1 is a cross-sectional view showing the state of the gas cut-off device according to the present invention when the valve is open, Fig. 2 is a cross-sectional view showing the state of the same device when the valve is closed, and Fig. 3 is a cross-sectional view showing the state of the gas cut-off device according to the invention when the valve is closed. FIG. 2 is an enlarged sectional view of a gas generator.

1 and 2, the gas cutoff device has a body 10 connected to a gas piping line, and this body 10 includes a gas inlet 12, a gas outlet 14,
A valve port 18 formed by a wall plate 16 provided in the body 10 and the pipe side, a flange 20 for attaching a valve driving section to be described later, and the like are provided, respectively. The valve drive unit attached to the flange 20 of the body 10 is a pedestal 22, and the cylinder 2 is attached to the pedestal 22.
4. A gas generator 26 screwed onto the upper end of the cylinder 24, a protruding rod provided to be slidable from an upper position to a lower position within the cylinder 24 by the pressing force of the gas generated by the gas generator 26. 28a
A piston 28 having
A valve body 32 provided below and having a valve stem 32a and a valve plate 32b is inserted from the outside of the cylinder 24 into a hole 33 that is laterally bored through at a predetermined location in the upper part of the valve stem 32a. holding pin 3 that holds the valve body 32 in the valve open position with respect to the valve port 18
4. A valve closing biasing spring 36 that applies spring pressure in the valve closing direction to the valve body 32 held in the valve open position, a bellows 38 provided surrounding the valve stem 32a, etc. are provided, respectively. . Note that the valve stem 32a of the valve body 32
is guided in a vertical hole 40 formed in the pedestal 22, and a threaded hole 42 is formed at the top end of the valve stem 32a. By screwing them together and pulling them up, the valve body 32 can be pulled up from the valve opening position. Further, a display plate 44, which will be described later, is attached to the outer end of the holding pin 34. Note that the spring specifications of the valve closing biasing spring 36 are selected in advance so as to apply pressure to the valve plate 32b to maintain the valve body 32 in the closed position when the valve body 32 is lowered to the closed position.

Referring now to FIG. 3, a well-known structure for a gas generator 26 is shown, including a body 50, a body 5
Reaction case 52 and body 5 provided below 0
0, a conductive wire 56 held within the insulator 54, a heater 58 provided at the inner end of the conductive wire 56, and a heater 58 surrounding the heater 58 and held within the reaction case 52. Igniter 60, gas generating agent 60a filled in reaction case 58, gas discharge port 62 formed at the lower end of reaction case 58
It is configured with a wire mesh 64 etc. that covers the.

Next, the operation of the gas cutoff device described above will be explained.
The gas cutoff device is installed at a suitable location in the gas piping path, and the valve body 32 is normally pulled up to the open position by the holding pin 34, so that the gas flow is directed to the gas inlet 1.
2, the gas flows through the valve port 18 and the gas outlet 14. In response to a gas leak signal from a gas leak detector (not shown) installed elsewhere for such a gas cutoff device or a fire detection signal from a fire extinguishing system, the gas generator 2
When the heater 58 is energized through the conductive wire 56 of No. 6, the heater 58 generates heat, and the igniter 60 is ignited by the heat. As a result, reaction case 5
The gas generating agent 60a stored in 2 reacts. Once the gas generating agent 60a starts the reaction, it continues the reaction by itself and generates high pressure gas. This high-pressure gas passes through the wire mesh 64 of the gas discharge port 62 and exerts a gas pressing force on the piston 28 held at a position above the cylinder 24. Therefore, the piston 28 moves downward, and a strong downward force is applied to the valve body 32 by the piston protruding rod 28a. At this time, the holding pin 34 for holding the valve open inserted into the valve stem 32a is made of a cuttable material such as plastic material, so that it is cut when the valve body 32 suddenly moves downward. . Therefore, the valve body 32, which was held open by the holding pin 34, rapidly descends due to the spring force of the valve opening biasing spring 36, closing the valve port 18 and cutting off the gas flow. Note that the cut holding pin 34 will fall from the gas cutoff device, so if the words "Valve Open" are displayed in advance on the surface of the display board 44 provided at the tip of the holding pin 34, it will prevent the holding pin 34 from falling. If the display board 44 also falls, it can be visually confirmed that the gas cutoff device is in the "valve closed" position. Note that characters may be formed in advance on the outer surface of the cylinder 24 so that when the display plate 44 falls, the message "Valve Closed" appears. FIG. 2 shows a state in which the valve plate 32b of the valve body 32 closes the valve port 18, and the holding pin 34 has fallen together with the display plate 44. In addition, in order to restore the gas cutoff device that has cut off the gas flow to the valve open state again as described above, remove it from the pedestal 22 of the cylinder 24 and insert it into the screw hole 42 formed at the upper end of the valve stem 32a of the valve body 32. By engaging a suitable threaded pull rod to pull up the valve body 32 and inserting a new holding pin 34 into the horizontal hole 33 of the valve stem 32a, the valve body 32 is first held in the open position. Next, after a new modular gas generator 26 is screwed onto the upper part of the cylinder 24, the cylinder 24 is again attached to the pedestal 22, and the restoration is completed.

As is clear from the above explanation, according to the present invention, not only can a power saving effect be obtained because a solenoid valve is not used to keep the valve open, but also it is possible to avoid malfunction of the gas shutoff device due to a power outage. . In addition, with regard to recovery work after the equipment has been activated, the gas generator can be modularized and there is no need to use powerful chemicals at the gas generation source, so the work can be done safely and easily. Furthermore, after the device is activated, the valve body is kept closed by a spring biasing force, and in order to open the valve, the valve body must be lifted up against the spring biasing force.
The valve can only be opened after two steps: a new retaining pin must then be inserted.
Therefore, the device is configured so that there is no risk of accidentally opening the gas flow path after the device is activated. For example, when using the gas cutoff device of the present invention in conjunction with a kitchen fire extinguishing system, it is possible to prevent the occurrence of a dangerous situation in which the gas cutoff device is opened before the extinguishing agent in the fire extinguishing system is refilled. Therefore, it is possible to form a highly safe fire extinguishing and gas cutoff system.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the gas cutoff device according to the present invention, and FIG. 1 is a cross-sectional view showing the valve in the open state;
FIG. 2 is a sectional view showing the gas cutoff state with the valve closed, and FIG. 3 is an enlarged sectional view of the gas generator used in the gas cutoff device. 10...Device body, 12...Gas inlet, 14
... Gas outlet, 18 ... Valve port, 22 ... Pedestal,
24...Cylinder, 26...Gas generator, 28...
...Piston, 28a...Protrusion rod, 32...Valve body, 3
4... Holding pin, 44... Display board.

Claims (1)

[Scope of utility model registration request] A gas cutoff device that is installed at an appropriate location in a gas piping path and shuts off the gas flow path at necessary times includes a valve port formed in the gas piping path, a valve body that opens and closes the valve port, and a valve body that is connected to the valve body. a retaining pin that holds the valve body in the valve open position against the spring biasing force of a valve closing bias spring; The valve body is configured to include a piston that can slide in the direction of the valve body in response to pressure, and a gas generator that is attached to the cylinder and applies a pressing force to the piston in conjunction with a start signal that is generated at necessary times. . A gas cutoff device, characterized in that the retaining pin holds the valve open in response to the sliding of the piston.