JPS6016866Y2 - automatic ignition safety device - Google Patents

Description

[Detailed description of the invention] The present invention relates to an automatic ignition safety device for gas appliances equipped with a thermoelectric ignition safety valve, and aims to provide a convenient device that can perform everything from ignition to main combustion with one-touch operation. A detailed explanation will be given below according to an example diagram.

Reference numeral 1 denotes a valve mechanism main body interposed in the gas supply path, and a thermoelectric ignition safety valve 3, which is normally closed, is provided on the gas port 2 side.

4 is a main valve that opens and closes the main gas path 6 connected to the main burner 5; 7 is a pilot valve that opens and closes the pilot gas path 9 that leads to the pilot burner 8; 10 is a thermoelectromotive force of a thermocouple 11 facing the pilot burner 8; is excited by
This is an ignition safety valve electromagnet that attracts and holds the safety valve 3 in an open state.

12 is a timer device, and in this embodiment, a piston 13
, a dashpot 1 consisting of a cylinder 14, a spring 15, etc.
6 is possible, but an electromagnet that operates in a timed manner may also be used.

Reference numeral 17 denotes an operating shaft for operating the valve mechanism main body 1, to which the first cam 18 is fixed and the second cam 16 is attached to the shaft 17.
It is inserted through the shaft so that it cannot rotate and can slide in the axial direction against the force of the spring 20.

Reference numeral 21 denotes a timer pressing lever which is pressed and rotated around the support shaft 22 by the timer pressing portion 18a of the first cam 18 to operate the timer device 12, and includes a piece 21a on the side facing the first cam 18 and a dash. Piston 13 of pot 16
and a piece 21b on the side facing the protruding end 13a.

Reference numeral 23 denotes a main valve opening/closing lever arranged coaxially with the timer press lever 21 and rotatable; the other end of the main valve rod 24, which has the main valve 4 attached to one end, is attached to the lever 23. .

25 is a spring that always biases the main valve rod 24 in the opening direction of the main valve 4; 26 is a protrusion provided on the piece 21b of the timer pressing lever 21, which faces the main valve 4 side of the main valve opening/closing lever 23; When the timer pressing lever 21 is rotated by the first cam 18, the protrusion 26 rotates the main valve opening/closing lever 23 and pulls the main valve rod 24 against the force of the spring 25, thereby closing the main valve 4. That's how it is.

Reference numeral 27 designates a tenth lever pivotably supported in a plane perpendicular to the rotation plane of the timer press lever 21, and like the protrusion 26, it is a retaining lever that comes into contact with the main valve 4 side of the main valve opening/closing lever 23. One end has a surface 27a and an inclined piece 27b that contacts the protrusion 26 at an inclined angle, and the other end is provided with a pressing piece 27C for rotating a 20th lever to be described later.

Reference numeral 28 designates a 20th lever 28 rotatably supported in the same plane as the 10th lever 21, and one end 28a is connected to the first lever 21.
The pressing piece 27c of the zero lever 27 faces downward, and the other end 28b rides on the stepped portion 18b of the first cam 18 when the operating shaft 17 is at the stop position, and when the operating shaft 17 rotates, the other end 28b rides on the stepped portion 18b. It is designed to fall off.

Reference numeral 29 designates a safety valve release lever that is rotatable in a plane orthogonal to the rotation plane of the 20th lever 28;
One end 29a is pressed and rotated by the cam 19, and the other end 29a is rotated.
9b presses and opens the safety valve 3, and when this safety valve presses and opens, the other end 28b of the 20th lever 28
The safety valve 3 is forcibly held in the open position even after the second cam 19 has moved away from the end 29a by falling off from the stepped portion 18b of the first cam 18 and coming into contact with the safety release lever 29. There is.

Reference numeral 30 denotes an inclined surface provided on one end 29a of the safety release lever 29, so that the second cam 19 can climb over the inclined surface 30 when the operation shaft 17 is rotated in the reverse direction to the stop position.

Reference numeral 31 denotes a switch actuation rod which is always urged by a spring 32 so as to contact the other end 28b of the 20th lever 28 from above, and when the actuation rod 31 is lowered, the normally open microswitch 33 is closed. It has become.

The switch 33 faces the pilot burner 8 and is inserted in series into the power supply circuit 35 of the discharge igniter 34.

36 is a pilot valve opening/closing portion formed on the first cam 18;
7 is a spring that always biases the safety valve 3 in the closing direction.

Note that at the stop position of the operating shaft 17, the timer pressing portion 18a of the first cam 18 is in a state of pressing the timer pressing lever 21. Therefore, in the dashpot 16 portion, the piston 13 is pressed by the timer pressing lever 21 and the spring 15 is pressed. is in a compressed state (force storage state), and when the operating shaft 17 rotates, the timer pressing portion 18a of the first cam 18
As a result, the timer pressing lever 21 becomes freely rotatable, and the piston 13 starts sliding due to the force of the spring 15.

In the above configuration, at the stop position of the operating shaft 17,
The other end 28b of the 20th lever 28 rides on the stepped portion 18b of the first cam 18 and is in a position removed from the safety release lever 29, and the safety valve 3 is in a freely closed state.

Further, the timer pressing portion 18a of the first cam 18 displaces the piston 13 to the spring 15 compression position (storage state) via the timer pressing lever 21, and at the same time, the protrusion 26 of the lever 21 pulls the main valve opening/closing lever 23. The main valve 4 is held in a closed state, and the engagement surface 27a of the tenth lever 27 is in contact with the side surface of the main valve opening/closing lever 23.

Now, in order to ignite, it is better to rotate the operating shaft 17 by a predetermined angle, and as the timer pressing portion 18a of the first cam 18 escapes from the pressing position on the timer pressing lever 21,
While the lever 21 is rotatable, the second cam 19 presses and rotates the safety valve release lever 29 to displace the safety valve 3 to the open position, and the other end 28b of the 20th lever 28 The safety valve release lever 29 has come off the stepped portion 18b and fallen down to press open the safety valve 3.
The lever 29 is locked in the open state of the safety valve by abutting against the side surface.

The first cam step portion 18b of this 20th lever 28
As the switch actuating rod 31 falls down from the spring 32, the switch actuating rod 31
The force moves downward and closes the microswitch 33, and spark discharge from the discharge igniter 34 starts, and the pilot valve opening/closing part 36 of the first cam 18 opens the pilot valve 7 to supply gas to the pilot burner 8. supply

When the timer pressing lever 21 becomes free, the piston 13 starts sliding due to the force of the spring 15, slides inside the cylinder 14 at a slow speed, and the protruding end 13 of the piston 13
a slowly rotates the timer pressing lever 21, and the protrusion 26 of the lever 21 pushes up the inclined piece 27b of the tenth lever 27.

Therefore, the other end pressing piece 27c of the 10th lever 27 descends and presses down the one end 28a of the 20th lever 28, so the other end 28b of the 20th lever 28 gradually rises and remains constant from the beginning of rotation of the operating shaft 17. After time t, the other end 28b of the 20th lever 28
9 is released, the switch operating rod 31 is pushed up, the microswitch 33 is opened, and the discharge is stopped.

After a further lapse of some time (Δt), the protruding end 13a of the piston 13 completely pushes up the inclined piece 27b of the tenth lever 27, and the retaining surface 27a of the tenth lever 27 comes off the main valve opening/closing lever 23, and the lever 23 opens the main valve 4 by the force of the spring 25.

Therefore, during this period, if the pilot burner 8 is ignited normally, the ignition safety valve electromagnet 10 is energized by the thermoelectromotive force of the thermocouple 11, so that the pressure from the safety valve opening lever 29 due to the locking of the 20th lever 28 is released. Even if the main burner 5 is opened, the safety valve 3 is kept open, and the main burner 5 is ignited and burned as the main valve 4 is opened.

On the other hand, if the ignition is not ignited for some reason, the electromagnet 10 is not excited and the safety valve release lever 29 becomes free due to the unlocking of the 20th lever 28.
The safety valve 3 is closed by a spring 37, and the gas supply path is cut off at its original position to perform a safe operation.

If the pilot burner 8 misfires during steady combustion, the thermoelectromotive force of the thermocouple 11 disappears, and the safety valve 3 similarly closes.

Further, in order to stop combustion, the operating shaft 17 should be reversely rotated to the stop position, and the timer pressing portion 18a of the first cam 18 rotates the timer pressing lever 21, and the pressing lever 21
presses the piston 13 and urges the dashpot 16 into a power storage state, and the protrusion 26 pulls the main valve opening/closing lever 23 to close the main valve 4.

The tenth lever 27 is the main valve opening/closing lever 23.
The main valve 4 is held in a closed state by being lowered and locked on the side surface of the main valve 4.

On the other hand, the stepped portion 18b of the first cam 18
As the other end 28b of the safety valve opening lever 29 pushes up, the pilot valve opening/closing part 36 of the angry cam 18 moves away and the pilot valve 7 closes, and the second cam 19 climbs over the slope 30 of the safety valve opening lever 29 and returns to its original position. .

As the pilot valve 7 is closed, the pilot burner 8 is extinguished and the thermocouple 11 is cooled and loses its thermoelectromotive force, so after a while the safety valve 3 is closed and everything is restored to its stopped state.

In the manual gas valve mechanism that has been widely used in the past, the ignition safety valve is pressed and released for a while at the pilot ignition position, and when a sufficient thermoelectromotive force of the thermocouple is obtained, the hand is released. The safety valve is self-retaining.

However, especially in the so-called rotating type, if the shaft rotation is stopped before the pilot ignition position (normally 90 degree rotation position), the safety valve and pilot gas valve will remain open and the piezoelectric igniter will operate. In the unlikely event that the pilot burner fails to ignite, if left unattended, raw gas may be released, resulting in a dangerous situation.

Furthermore, with an automatic device like the one of the present invention, the user tends to perform only the first operation, leave the rest to the device, and neglect subsequent monitoring. However, there is a problem in that the risk of releasing raw gas is greater than in the conventional manual type.

The present invention has been constructed as described above in order to solve this problem, and in the event that the rotation of the operating shaft 17 is stopped midway, the timer pressing portion 18a of the first cam 18 will be pressed against the dashpot 1.
6 remains within the rotation range of the timer pressing lever 21 and the lever 21 hits this timer pressing part 18a, so that the operation of the dashpot 16 is stopped midway, while the pilot valve 7 is Although it is pressed by the pilot valve opening/closing part 36 of the first cam 18 and remains open, if the dashpot 16 stops, the discharge stop by the twentieth lever 28 will not be performed.
The igniters 34 are no longer discharged, and the gas discharged from the pilot burner 8 continues to be ignited and burned by the discharge sparks, thereby avoiding dangers such as explosions and poisoning due to raw gas discharge.

Although the operation was performed normally, the timer device 1
2 (dashpot) exhibits the same effect even if it stops during operation or from the beginning due to a failure, and safety is further improved.

If a spark indicator lamp 38 is provided in the ignition circuit, the user will know that there is a malfunction and restart the operation when he sees that the lamp 38, which should go out when the dashpot 16 completes operation during normal operation, does not go out. It becomes convenient above.

Furthermore, as is clear from the explanation of the above-mentioned operation, the safety valve 3
The pressing and holding operation of the igniter 34 and the on/off operation of the igniter 34 are both performed by the 20th lever 28.
When the ignition spark is stopped by opening the switch 33, the forced pressure on the safety valve 3 is also released, so there is no possibility that raw gas will be released from the pilot burner 8 after the spark stops.

That is, regardless of whether the operation of the dashpot 16 is completed or not, or in other words, whether the operation shaft 17 is rotated completely or incompletely, raw gas is never released.
This results in an extremely safe device.

As described above, the present invention is equipped with a thermoelectric ignition safety valve that is held open by the thermoelectromotive force of a thermocouple facing the pilot burner, and is operated for a certain period of time at the beginning of the ignition operation in conjunction with the operation of the timer device. In an automatic ignition safety device that forcibly opens a safety valve and forcibly closes a main valve, there is provided a timer press lever whose one end is pressed by a timer press part of a first cam fixed to an operating shaft and rotates, and the lever. A timer device that is pressed by the other end and is biased into a power storage state and presses and rotates the operating time lever, and a safety valve opener that is rotated by a second cam provided on the operating shaft and presses the safety valve to the open position. a lever, and a lock lever that holds the safety valve release lever in the safety valve open state and operates the ignition device, and whose actions are released by the timer device, and the timer device has a first lock lever. The timer press part of the cam releases the pressure on the timer press lever and moves away from the lever to operate, and it is not only extremely convenient because everything from ignition to main combustion can be done with one touch, but also because the operation shaft Even if it is stopped at an incomplete position, raw gas will not leak out, which is an excellent safety feature.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a plan sectional view, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG.
C sectional view, Figure 4 is the same C-C immediately after the ignition rotation operation
FIG. 3...Thermoelectric ignition safety valve, 4...Main valve, 8...Pilot burner, 11...
...Thermocouple, 12... Timer device, 17.
...Operation axis, 18...First cam, 18a
...Timer pressing part, 19...Second cam, 21...Timer pressing lever, 28...
...20th lever, 29...Safety valve release lever 34...Discharge igniter.

Claims (1)

[Scope of utility model registration request] Equipped with a thermoelectric ignition safety valve that is held open by the thermoelectromotive force of a thermocouple facing the pilot burner, the thermoelectric ignition safety valve is equipped with a thermoelectric ignition safety valve that is held open by the thermoelectromotive force of a thermocouple facing the pilot burner. The electric ignition safety valve is forcibly opened and the main valve is forcibly closed, and the timer press lever has one end pressed by a timer press part of a first cam fixed to an operating shaft and rotates, and the timer press lever. A timer device that is pressed by the other end of the lever to press and rotate the timer press lever when activated, and is rotated by a second cam provided on the operating shaft to move the ignition safety valve to the open position. The safety valve release lever is pressed to hold the safety valve in the open state and acts to operate the ignition device, and the timer device releases these actions to release the forced open state of the safety valve and activate the ignition device. The timer device has a lock lever that also serves to stop the operation, and the timer device is activated when the timer pressing portion of the first cam releases the pressure on the timer pressing lever and moves away from the lever. An automatic ignition safety device featuring: