JPS6119328Y2 - - 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 over while using gas, extinguishing the flame due to wind, or carelessness.
Erroneous dial (valve) operation due to children's mischief, etc.
If the ignition does not actually occur even after you have tried to ignite it, there may be a crack in the rubber tube connecting the main stopper to the range.

The present invention provides a danger prevention timer with the aim of preventing accidents caused by these causes. The purpose is to maintain the open state of the valve by checking the combustion of the gas burner.

The present invention will be described below with reference to embodiments shown in the drawings. As shown in FIG. 1, the danger prevention device for a gas burner according to the present invention includes a normally closed electromagnetic on-off valve 1 and a timer switch 2 disposed in the gas passage.
A valve opening/closing circuit is constructed by connecting the first contact 2a of the valve 1 in series, and also includes a lever 3 that locks the opening/closing valve when the opening/closing valve 1 is open, and is energized to lock the lock lever. a lock release solenoid 4 that releases the lock; and a lock confirmation switch 5 that closes when the lock lever 3 is in the locked state.
, a heat sensing element 6 that opens after confirming combustion of the gas burner, and a second contact 2 of the timer switch 2.
B is connected in series to form a combustion confirmation circuit, the timer switch 2 is operated, and the switch 2c is connected in series.
is first momentarily connected to the first contact 2a, and then connected to the second contact 2b after a certain period of time.

The on-off valve 1 forms a chamber 9 isolated from the atmosphere by a diaphragm 8 disposed within a casing 7, and a valve body 10 is accommodated in the chamber. This valve body 10
is rotatably supported by the casing 7 by a pin 11, has a valve seat 12 at its tip, and has a spring 13.
The urging force causes the valve seat 12 to constantly come into contact with the valve seat 15 formed at the tip of the passage 14, thereby closing the passage 14. The valve body 10 is connected to a plunger 18 of a solenoid 17 via a plunger rod 16 engaged at its rear end. Note that 19 is a secondary passage of the on-off valve 1.

The timer switch 2 is always connected to the second contact 2b, and the switch 2c is set to the first contact point by manual operation.
After the switch 2c is connected to the contact point, the switch 2c is connected to the second contact point 2b again after a certain period of time by the spring 20 and a governor (not shown).

The lock lever 3 is attached to the machine frame bracket 21 (second
) is rotatably supported by a spring 22 and urged in the direction of the plunger rod 16 of the normally open/close valve 1;
The plunger rod 16 is locked by engaging with a recess 23 formed on the rod.

The unlocking solenoid 4 is connected to the plunger 24
The tip of the lock lever 3 is connected to the lock lever 3.

The lock confirmation switch 5 has the lock lever 3 as a conductor, and is composed of the lock lever and a contact 25 disposed in the recess 23 of the lock 16 of the solenoid 17. At this time, lock lever 3 and contact 2
5 are electrically connected. Therefore, between the lock lever 3 and the machine frame bracket 21, between the contact 25 and the rod 16, and between the lock lever 3 and the solenoid 4,
It is preferable that the plungers 24 are electrically insulated.

Note that the lock confirmation switch 5 does not consist of the lock lever 3 and the contact 25 as shown in the figure, but uses the stroke of the plunger 24 depending on whether the lever 3 does not fall into the recess 23 or when it falls. It may also be configured by a switch such as a limit switch that opens and closes with the help of a switch.

In the figure, 26 indicates a power source, and the heat sensing element 6 is made of bimetal.

The danger prevention device in the gas burner of the above embodiment configured in this way operates as follows. Figure 1 shows a state in which the gas burner is not in use. In this state, the switch 2c of the gas burner 2 is connected to the second contact 2b, and the valve opening/closing circuit including the first contact 2a is current. is not flowing and solenoid 17 is demagnetized.
Therefore, the plunger 18 is in the upper position due to the biasing force of the spring 13, and the valve seat 12 of the valve body 10 is brought into contact with the valve seat 15 of the passage 14 via the rod 16, thereby closing the passage 14. On the other hand, the combustion confirmation circuit including the second contact 2b is connected to the lock lever 3 and rod 16 side because the lock lever 3 is not in the locked position, that is, in the position where it has fallen into the recess 23 formed in the rod 16, as shown in FIG. The contact 25 is separated, and the lock confirmation switch 5 is open.
Therefore, the unlocking solenoid 4 is not energized.

When using a gas burner, first turn on the switch 2c of the timer switch 2 to the first contact 2a. Then, the solenoid 17 is energized, moves the plunger 18 downward against the biasing force of the spring 13, and rotates the valve body 10 clockwise via the rod 16. Therefore, the valve seat 12 of the valve body 10 separates from the valve seat 15 of the passage 14 to open the passage 14 and allow gas to flow out through the chamber 9 into the secondary passage.
The gas that has flown out into the secondary passage in this way is sent to a gas burner (not shown) and ignited there.
On the other hand, as the rod 16 descends as the solenoid 17 is energized, its recess 23 reaches the position of the lock lever 3, and the urging force of the spring 22 causes the rod 16 to move downward.
It is locked by the lock lever 3 which falls into the position. As shown in FIG. 3, when the lock lever 3 falls into the recess 23, it comes into contact with the contact 25 located in the recess 23, thereby closing the lock confirmation switch 5. However, until the switch 2c of the timer switch 2 reaches the second contact 2b, no current still flows through the combustion confirmation circuit. Switch 2c of timer switch 2 is second contact 2b
When the bimetal 6 is heated by the heat of the flame of the ignited gas burner while reaching , the bimetal 6 is actuated by the heat and opens the circuit. Therefore, while the gas burner is burning, the bimetal 6 is open, so even if the switch 2c of the timer switch 2 reaches the second contact point,
Current still does not flow through the combustion confirmation circuit, and the lock release solenoid 4 is not energized.

If the flame of the gas burner suddenly goes out in such a combustion state, the bimetal 6 will cool down and
The bimetal is thereby electrically connected. Then, current flows through the combustion confirmation circuit, energizes the lock release solenoid 4, and releases the plunger 2.
Move 4 to the left. When the plunger 24 moves to the left, the lock lever 3 moves to the left along with the plunger 24 and separates from the recess 23 formed on the rod 23 of the on-off valve 1. Therefore, the rod 23 is moved upward by the biasing force of the spring 13, and the valve body 10 is accordingly rotated counterclockwise to close the passage 14 with the valve seat 12 of the valve body, thereby closing the passage 14. Prevent gas from escaping. On the other hand, the energized lock release solenoid 4 causes the plunger 24 to move to the left together with the lock lever 3, thereby separating the lock lever from the connection point 25 of the rod 16 and opening the switch 5, so that it is immediately demagnetized. . When the lock release solenoid 4 is demagnetized, the plunger 24 moves to the right again by the biasing force of the spring 22, but since the recess 23 on the rod 16 of the on-off valve 1 has moved upward, the lock lever 3
will not fall into the recess 23.

It should be noted that the above-mentioned embodiment shows an example of the combustion confirmation 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 danger prevention device in the gas burner according to the present invention is extremely safe because it blocks the gas flow path when the burner flame goes out.
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 explanation of the drawing]

Fig. 1 is a wiring diagram conceptually showing the danger prevention device in a gas burner according to the present invention, Fig. 2 is a cross-sectional view taken along the line A-A, and Fig. 3 is a cross-sectional view of Fig. 2, in which the lock lever is located in the rod recess. It is a diagram showing a depressed state. 1... Solenoid on-off valve, 2... Timer switch,
3... Lock lever, 4... Lock release solenoid, 5... Lock confirmation switch, 6... Heat sensing element, 10... Valve body, 14... Primary side passage, 16
... Rod, 17 ... Solenoid, 18 ... Plunger, 19 ... Secondary passage, 22 ... Spring, 2
3... recess, 24... plunger, 25... contact.

Claims (1)

[Scope of utility model registration request] A normally closed electromagnetic on-off valve disposed in the gas passage and the first contact of a timer switch are connected in series to constitute a valve on-off circuit, and when the on-off valve is open, the on-off valve is Equipped with a lever that locks the
A lock release solenoid that is energized to release the lock lever, a lock confirmation switch that closes when the lock lever is in the locked state, a heat sensing element that opens the circuit after confirming combustion of the gas burner, and a timer switch switch. Two contacts are connected in series to form a combustion confirmation circuit, and the timer switch is activated to momentarily connect the switch to the first contact and then connect it to the second contact after a certain period of time. A danger prevention device in a gas burner characterized by: