JPS6042261Y2 - Gas burner safety device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a safety device for a gas burner, and more specifically, to a safety device that stops gas from flowing out when the gas burner is not burning.

Accidents caused by gas are extremely common, such as poisoning accidents caused by gas filling the room, explosion accidents, and accompanying fires.

These causes include boiling while using gas, extinguishing the flame due to wind, etc., incorrect dial (valve) operation due to carelessness, child's mischief, etc.
If the fire does not actually ignite, there may also be a crack in the rubber pipe connecting the wood stopper to the range.

An object of the present invention is to provide a safety device for a gas burner that can prevent accidents caused by these causes.

The present invention will be described below with reference to embodiments shown in the drawings.

The safety device for a gas burner according to the present invention, as shown in one embodiment in FIG. a lever 3 that locks the valve when the valve is opened;
A lock confirmation switch 4 that closes when the lock lever is in the locked state, a lock release solenoid 5 that unlocks the lock lever 3, and a push button switch 6 that activates the solenoid 5 via the lock confirmation switch 4. and a gas leak detection means 7 having a configuration to be described later.

The on-off valve 1 forms a chamber 10 isolated from the atmosphere by a tire flamm 9 disposed within a casing 8, and a valve body 1 is placed in the chamber.
Contains 1.

The valve body 11 is rotatably supported by the casing 8 by a pin 12, and the valve seat 13 is always brought into contact with a valve seat 16 formed at the tip of the passage 15 by the biasing force of a spring 14, thereby opening the passage 15. It's blocked.

Further, this valve body 11 is connected to a plunger 19 of a solenoid 18 via a plunger rod 17 engaged with its rear end.

Note that 20 is a secondary passage of the on-off valve 1.

As shown in FIG. 2, the lock lever 3 has its proximal end rotatably supported by the machine frame bracket 22, and is always urged toward the plunger rod 17 of the on-off valve 1 by a spring 23.

The lever 3 functions to fall into a recess 24 formed on the plunger rod 17 and lock the plunger rod 17 when the on-off valve 1, which will be described later, is opened or closed.

The lock release solenoid 5 has a plunger 25 connected at its tip to the lock lever 3.

The lock confirmation switch 4 is a lock lever 3 made of a conductor.
and a contact 26 disposed in the recess 24 of the rod 17, and the circuit is closed when the lock lever 3 almost falls into the recess 24 of the rod 17.

Therefore, between the lock lever 3 and the machine frame bracket 22,
It is preferable that the contacts 26 and the rod 17 and between the lock lever 3 and the plunger 25 of the solenoid 5 be electrically insulated.

Note that the lock confirmation switch 4 does not consist of the lock lever 3 and the contact 26 as shown in the figure, but uses the stroke of the plunger 25 depending on when the lever 3 does not fall into the recess 24 and when it falls. It may be configured by a switch such as a limit switch that opens and closes.

The gas leak detection means 7 comprises a transformer 27, a relay 29 whose normally open contact 28 is connected in parallel to the starting switch 6 of the solenoid 25, and a gas detection element 30 interposed between the two. 30 acts to energize relay 29 when gas leakage is detected.

Note that this detection means 7 is a known one.

The gas burner safety device constructed in this manner and shown in the above embodiment operates as follows.

FIG. 1 shows a state in which the gas burner is not in use, and in this state, the plunger 18 is in the upper position due to the biasing force of the spring 14.

Therefore, the rod 17 passes through the valve seat 13 of the valve body 11 into the passage 15.
The valve seat 16 is brought into contact with the valve seat 16 to close the passage 15.

When using the gas burner, press the push button switch 2.

Since the solenoid 18 is thus energized, its plunger 19 moves the rod 17 downward against the biasing force of the spring 14.

As a result, the valve body 11 is rotated clockwise, whereby the valve seat 12 of the valve body 11 separates from the valve seat 16 of the passage 15 to open the passage 15 and direct the gas through the chamber 10 to the secondary side. Let it flow into the aisle.

The gas flowing out into the secondary passage is sent to a gas burner (not shown) and ignited there.

On the other hand, the rod 1 descends as the solenoid 18 is energized.
7, its recess 24 reaches the position of the lock lever 3, and is locked by the lock lever 3 which has fallen into the recess 24 by the biasing force of the spring 23.

At this time, the lock lever 3 is moved to the contact point 2 as shown in FIG.
6, and closes the lock confirmation switch 4 composed of both.

In such a combustion state of the gas burner, if the gas leaks out of the gas burner due to some reason, the gas detection element 30 detects this and excites the relay 29.

As a result, the relay contact 28 is closed, so the contact 28
The solenoid 5 is energized via the lock confirmation switch 4 which is in the closed state, and the plunger 25 is moved to the left.

When the plunger 25 moves to the left, the lock lever 3 moves to the left along with the plunger 25 and separates from the recess 24 formed on the rod 24 of the on-off valve 1.

Therefore, the rod 17 is moved upward by the biasing force of the spring 24, and the valve body 11 is accordingly rotated counterclockwise.

As a result, the valve seat 13 of the valve body 10 closes the passage 15,
Preventing gas from escaping from the passage.

On the other hand, the energized lock release solenoid 5 is immediately demagnetized because the movement of the plunger 25 causes the lock lever 3 to move away from the contact 26 of the rod 17 and open the switch 4.

When the lock release solenoid 5 is demagnetized, the plunger 25 moves to the right again due to the biasing force of the spring 23, but since the recess 24 on the rod 17 of the on-off valve 1 has moved upward, the lock lever 3 It will not fall into the recess 24.

To extinguish the burner problem under normal conditions, the solenoid 5 may be activated by pressing the push button switch 6.

In this way, the valve 1 can be closed in the same manner as described above.

It should be noted that the embodiment described above is an example of a safety device for a gas burner according to the present invention, and various modifications may be made without departing from the scope of the claims.

As mentioned above, the gas burner safety device according to the present invention is
If the flame of the burner goes out or if gas leaks into the room while the burner is in use due to cracks in the rubber tube, etc., the gas flow path is automatically shut off, thus preventing the above-mentioned accidents. .

Moreover, the excitation of each solenoid is instantaneous, which not only improves the durability of the solenoid but also reduces power consumption as much as possible.

[Brief Description of the Drawings] Fig. 1 is a wiring diagram conceptually showing the safety device of a gas burner according to the present invention, Fig. 2 is a sectional view taken along line A-A, and Fig. 3 is a sectional view of Fig. 2. FIG. 6 is a diagram showing a state in which the lock lever has fallen into the rod recess. 1...Solenoid on/off valve, 2...Push button switch, 3...Track lever, 4...Track confirmation switch, 5...Tatch release Solenoid for 6
・Push button switch, 7... Gas leak detection device, 11... Valve body, 15... Primary side passage, 17... Lid, 18... ... Solenoid, 19 ... Plunger, 20 ... Secondary passage, 23 ... Spring, 24 ... Recess, 25 ... ... Plunger, 26 ... Contact, 28 ... Curved relay contact, 29 ... Relay 3
0... Gas detection element.

Claims (1)

[Scope of utility model registration request] A normally closed electromagnetic on-off valve installed in the gas passage, a switch to activate the valve, a lever that locks the valve when the electromagnetic on-off valve opens, and a lock confirmation that closes the circuit when the lock lever is in the locked state. a switch, a lock release solenoid that unlocks the lock lever when activated, a switch that activates the solenoid via the lock confirmation switch, and a gas leak detector that closes its electrical contact when a gas leak is detected. A safety device for a gas burner, comprising means, and an electric contact of the detection means is connected in parallel to a starting switch of the unlocking solenoid.