JPH0556745B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] Industrial Field of Application The present invention relates to a gas cutoff device that operates based on a gas leak, a large amount of gas outflow, or an abnormal drop in gas pressure.

Conventional technology Conventionally, this type of gas shutoff device has been equipped with a gas leak detector placed near the gas combustion appliance to detect gas leaks caused by a power outage, a hose falling off, a misoperation of the pot, etc. When this occurs, the sensor issues an alarm and a shutoff valve is manually or automatically operated to shut off the gas supply flow path.

In addition, in the event of an abnormal drop in gas pressure due to cracks in the piping, empty piping, gas outage, malfunction of the pressure regulator, etc., a pressure detection means installed near the gas supply source will issue an alarm and operate the shutoff valve. However, the gas supply channel was blocked.

Problems to be Solved by the Invention However, none of the above conventional devices simultaneously prevents gas leakage and abnormal decrease in gas pressure.
Furthermore, since the shutoff valve was operated by an electrical signal, there were problems such as it being completely ineffective especially during a power outage.

The present invention was made to solve the above problems, and its purpose is to not only simultaneously prevent accidents caused by gas leaks and gas pressure drops, but also to ensure safety even during power outages. The purpose of the present invention is to provide a gas cutoff device that can

[Structure of the Invention] Means for Solving the Problems The gas cutoff device of the present invention includes an electromagnetic cutoff valve that cuts off a gas supply flow path based on an electric signal from a gas leak detector, and an abnormality in gas pressure on the downstream side. An overflow shutoff valve that mechanically shuts off the supply flow path due to a drop in supply flow, and an overflow shutoff valve that allows gas to flow downstream of both cutoff valves to check for abnormalities such as gas leaks or gas pressure drops. It is characterized by comprising a return solenoid valve for automatically opening the valve.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In Figure 1, 1 is the gas supply source.
It is an LP gas container. Note that this LP gas container 1 can be replaced with a gas supply source such as city gas.

Reference numeral 2 denotes a pressure regulator, which adjusts the gas pressure from the LP gas container 1 by reducing the pressure as appropriate. 3 is a gas meter.

Reference numeral 4 denotes an overflow cutoff valve, which has a structure as shown in detail in FIG. 2, for example. That is, in FIG. 2, 5 is a valve body, and an inlet passage 6 and an outlet passage 7 are formed in the lower part thereof. A valve seat 8a is formed in the opening 8 between the inflow passage 6 and the outflow passage 7, and a valve body 9 is seated on or separated from the opening 8 to block or open the opening 8. It's getting old.

The valve body 9 is integrally attached to a spindle 10 that vertically passes through the center of the valve body 5, and the opening 8 opens as the spindle 10 moves up and down. Performs shutoff/opening operations. A dish-shaped piston 11 is integrally attached to the intermediate portion of the spindle 10, and a bellows flamm 13 is sandwiched between it and a retainer 12 attached thereto. The bellow flam 1
3 is composed of a flexible membrane material such as a rubber membrane,
Its outer peripheral portion is fixed to the valve body 5.

A spring 14 is fitted between the valve body 5 and the dish-shaped piston 11, and is inserted between the valve body 5 and the dish-shaped piston 11.
is adapted to be elastically pressed against the valve seat 8a. The strength of the spring 14 is set so as to open the valve body 9 when the gas pressure in the outflow passage 7 is a normal pressure (for example, 190 mmH ₂ O).

A spring 15 is also disposed below the valve body 9 and urges the valve body 9 in a direction away from the valve seat 8 in opposition to the spring 14 .

Reference numeral 16 denotes a micro switch, which is turned on and off by the vertical movement of a plate 17 attached to the upper end of the spindle 10, and sends a signal for activation of the overflow cutoff valve 4 through a core wire 18, which will be described later. It is now sent to the controller. Reference numeral 19 is a push button, which allows the valve body 9 to be opened manually.

Further, in FIG. 1, reference numeral 20 denotes an electromagnetic cutoff valve, which has a structure as shown in FIG. 3, for example.
That is, in FIG. 3, reference numeral 21 denotes a valve body, which forms an inflow passage 22 and an outflow passage 23 in its lower part. A valve seat 24a is formed in the opening 24 between the inlet passage 22 and the outlet passage 23. Reference numeral 25 denotes a valve body, which is attached to the lower end of a stem 26 vertically disposed in the center of the valve body 21. The upper part of the stem 26 is attached to a movable iron core 27, and is adapted to move up and down together. 28 is a fixed iron core,
A spring 29 is fitted between the moving iron core 27 and the movable iron core 27. 30 is a coil.

Furthermore, in FIG. 1, numeral 31 is a return solenoid valve, which has a structure as shown in FIG. 4, for example. That is, in FIG. 4, 32 is a valve body with an inlet passage 33 and an outlet passage 34 in its lower part.
is formed. Reference numeral 34 denotes a valve seat, which is opened and closed by a valve rubber 36 fitted onto the lower end surface of the movable iron core 35.

37 is a fixed iron core, and a spring 38 is inserted between it and the movable iron core 35. 39 is a coil.

The core wires 18 from the overflow cutoff valve 4, the electromagnetic cutoff valve 20, and the return electromagnetic valve 31 are collected in the pool box 40, and the controller 41
is connected to.

As shown in the figure, the controller 41 is equipped with a power supply pushbutton switch 42, a buzzer stop pushbutton switch 43, and a reset pushbutton switch 44, as well as a power supply lamp 45, a gas leak alarm lamp 46, and an alarm lamp 46. A flow alarm lamp 47, a pressure equalization indicator lamp 48, a shutoff valve operation indicator lamp 49, a seismic sensor operation indicator lamp 50, etc. are attached.

In addition, in the figure, 51 is a gas curran connected to various gas combustion appliances, 52 is a known gas leak detector, and 5
3 is a known earthquake sensor, and 54 is an alarm.

Next, the operation of the apparatus of the above embodiment will be explained.

First, press the power switch button 42 to light the power lamp 45 in green. If a gas leak occurs due to a hose falling off, a misoperation of the pot, or a gas leak, the gas leak detector 52 detects this and turns on the gas leak alarm lamp 4 of the controller 41.
6 lights up in red, and the alarm 54 sounds.
A signal is transmitted to the electromagnetic cutoff valve 20.

In the electromagnetic cutoff valve 20 that received the signal, the coil 30
is excited, the movable iron core 27 moves in the direction of the fixed iron core 28 against the spring 29, moves the stem 26 upward, raises the valve body 25, and opens the opening 2.
4 to block the inflow path 22 and outflow path 23. At this point, the cause of the gas leak will be investigated and repaired.
Subsequently, when the buzzer stop push button switch 43 of the controller 41 is pressed, the alarm 54 stops sounding.

Next, press the reset push button switch 44 to 30 to 40
When pressed for a second, the pressure equalization display lamp 48 lights up yellow and a signal is sent to the return solenoid valve 31. In the return electromagnetic valve 31 that has received the signal, the coil 39 is magnetized and the movable iron core 35 moves toward the fixed iron core 37 against the spring 38, and the valve seat 34 is accordingly opened.

When the inflow path 33 and outflow path 34 of the return solenoid valve 31 communicate with each other, gas flows in the direction of the gas cylinder 51, and if there is no gas leak, the gas leak alarm lamp 4 is activated.
6 disappears, press the reset push button switch 44.
Let go of your hand.

On the other hand, if the gas leak continues, the gas leak alarm lamp 36 will not go out. In this case, eliminate the cause of the gas leak, such as an appliance, and press the return push button switch 44 again to turn off the gas leak alarm lamp 36. Check again until it disappears.

When the gas leak alarm lamp 36 goes out and safety is confirmed, an electric signal for cancellation is sent to the electromagnetic cutoff valve 20, and the gas pressure on the downstream side is restored, pushing up the spring 14 via the bellow flamm 13 and pushing up the valve body 9. The overflow cutoff valve 4 automatically opens and returns to normal use.

In addition, if the downstream gas pressure suddenly and abnormally decreases due to cracks in the piping, empty piping, gas outage, malfunction of the pressure regulator 2, etc., the overflow warning lamp 47 of the controller 41 lights up in red, and the alarm 54 sounds.

As the gas pressure decreases, the overflow cutoff valve 4 shown in FIG. Then, the valve body 9 closes the opening 8.

Incidentally, the electromagnetic cutoff valve 20 is also closed at the same time. At this point, investigate the cause of the overflow and repair it.

Next, when the return push button switch 44 is pressed, the pressure equalization display lamp 48 lights up in yellow and the return solenoid valve 31 is opened.

At this time, if the cause of the overflow has disappeared, the overflow alarm lamp 47 will go out, and the user will release the return push button switch 44.

If the overflow alarm lamp 44 does not go out, check the cause of the overflow again and repeat the check until the red lamp goes out. When the overflow alarm lamp 47 goes out and safety is confirmed, an electric signal for cancellation is sent to the electromagnetic cutoff valve 20 and the gas pressure on the downstream side is restored, pushing up the spring 14 via the bellow flamm 13 and closing the valve body 9. is raised, the overflow cutoff valve 4 automatically opens, and the normal operating state is returned.

Incidentally, in the event of a power outage, it is also possible to perform the above check by pressing the push button 19 of the overflow cutoff valve 4.

Furthermore, in the event of an earthquake, the seismic sensor 53 is activated at a seismic intensity of 5, for example, and the same operations and checks as in the case of the above-mentioned overflow accident can be performed.

[Effects of the invention] (1) Since the overflow cutoff valve is mechanically operated, it can operate even during a power outage and ensure safety.

(2) Both the overflow cutoff valve and the electromagnetic cutoff valve have a full port structure, so pressure loss is extremely low.

(3) Self-inspection for gas leaks can be performed by operating the return button, and the system will return only after safety has been confirmed.

(4) The electromagnetic cutoff valve is a energized closing type, so power consumption is low and there is no risk of overheating.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of the gas concentration safety system incorporated into the device of the present invention, Fig. 2 is a sectional view of the overflow cutoff valve,
FIG. 3 is a sectional view of the electromagnetic cutoff valve, and FIG. 4 is a sectional view of the return electromagnetic valve. 1...LP gas container, 2...pressure regulator, 3...
... Gas meter, 4 ... Excess flow cutoff valve, 5 ... Valve body, 6 ... Inflow path, 7 ... Outflow path, 8 ... Opening, 8a ... Valve seat, 9 ... Valve body, 10 ... Spindle, 11... dish-shaped piston, 12... retainer, 13... bellow flam, 14... spring, 15... spring, 16... micro switch, 17... plate, 18... core wire, 19...
... Push button, 20 ... Electromagnetic cutoff valve, 21 ... Valve body, 22 ... Inflow path, 23 ... Outflow path, 24 ...
Opening portion, 24a... Valve seat, 25... Valve body, 26...
... Stem, 27... Moving core, 28... Fixed core, 29... Spring, 30... Coil, 31
... Solenoid valve for return, 32 ... Valve body, 33 ... Inflow path, 34 ... Outflow path, 35 ... Moving iron core, 36
... Valve rubber, 37 ... Fixed iron core, 38 ... Spring, 39 ... Coil, 40 ... Pool box, 41 ... Controller, 42 ... Push button switch for power supply, 43 ... Push button switch for buzzer stop, 44...Push button switch for return, 45...Power lamp, 46...Gas leak alarm lamp, 47...Overflow alarm lamp, 48...
Equal pressure indicator lamp, 49...Shutoff valve operation indicator lamp, 50...Seismic sensor operation indicator lamp, 51...Gascarn, 52...Gas leak detector, 53...Seismic sensor, 54...Alarm.

Claims (1)

[Claims] 1. An electromagnetic cutoff valve that shuts off the gas supply flow path based on an electrical signal from a gas leak detector, and an overflow cutoff valve that mechanically shuts off the supply flow path due to an abnormal drop in gas pressure on the downstream side. It is characterized by comprising a return solenoid valve that flows gas downstream of both cutoff valves to check for abnormalities such as gas leakage or gas pressure drop, and automatically opens the overflow cutoff valve. gas cutoff device.