JPS608405B2 - Gas outflow automatic shutoff device in gas combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for automatically shutting off gas outflow from a burner in the event of an abnormality in various gas combustion appliances such as a gas stove, water loom, or gas bath kettle. It is an object of the present invention to provide a device that not only prevents the release of raw gas due to water-off by opening the valve twice, but also can set an automatic shut-off function for dry boiling at the same time.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows the overall configuration, in which fuel gas supplied from a fuel gas source S is supplied to a main cock 1, a flow rate adjustment section 3,
It reaches the burner 4 via the automatic shutoff device 2.

This burner 4 is attached with a discharge type ignition device 5. The automatic shutoff device 2 is equipped with a pair of shutoff valves Va and Vb located in series in the middle of the gas supply flow path, and both valves Va
, Vb are in the open state, gas is supplied.

The shutoff valves Va and Vb open and close the flow passages by rotating the valve elements 6a and 60, respectively, and the opening and closing operations are performed by the respective valve elements 6a and 6.
The direction of the valve rotation axis of actuators 7a and 7b screwed together with
by finger displacement in the vertical direction). In other words, Benko 6
a and 6b each have a screw shaft 8a with a large lead angle.
, 8b are fixed, and these screw shafts 8a, 8b are connected to actuators 7a, 8b.
Inserted into 7b, actuator? It is screwed into the pieces ga, 9b fixed to the lower ends of the actuators 7a, 7b. are elastically biased downward by the compression springs 10 and 1, and the valves 6a and 6b are respectively closed at the lowest position.The center of the case i of the automatic shutoff device 2 is marked with a ``gas flow rate'' mark. An operating shaft 13 is inserted into the operating knob 12 for adjustment, and the operating shaft 13 is inserted into the operating knob 12 for rotation.
, IS is installed inside.

The inner collar 14 has the same diameter as the operating collar 16 fixed to the operating shaft 13, and is located on the collar turtle 6 and floating on the operating shaft 13. Further, the external force rack 15 is connected to the operating collar 16 and the internal force rack 4. A ring 17 having a pair of arms 17a and 17b is radially attached to the operation shaft 13, and both arms 17a?
passes through the external force roller 15 and protrudes to the outer periphery, and this arm ejector is inserted into the pair of upper and lower slits 18a? In addition, this external force collar turtle 6 is strongly urged downward by a spring 19.A pair of inclined cams 20, 20 are formed at the upper part of the inner collar turtle with a phase of 18 pips. cam 20,
20 hits the middle of the arm turtles 7a and 17b.

The inner collar force 4 and the operating collar 16 consist of two pins 22, 22 biased upward by a 2M spring and two inclined recesses 2.
3 and 23, and when the operating shaft amount 3 rotates in the valve opening direction X, the inner collar 14 rotates integrally with the operating collar 16.
When the inner collar 1 is removed from the inner collar 1, only the operating collar 16 rotates, and the inner collar 1 is rotated sequentially in the 18-bit direction for each reciprocating rotation of the operating shaft 13.
When the turtle rotates 180 degrees, the outer collar 15 is pushed upward against the spring 19 by the contact between the inclined cams 20, 20 and the arms 17a, 17b, and the inner collar 14 is pushed up by approximately 1
When the arm 17a and the blade 7b rotate 80 degrees, the cam 2
07 It comes off from the fabric of 28 and is rapidly lowered by the spring 19. At this time, the lower end of the external force roller 15 applies an impact to the piezoelectric element 2M housed in the lower part, and the electromotive force from the piezoelectric element 24 is sent to the ignition device needle. is a pair of cams 25a, 2 for opening/closing operation.
The cams 25a and 25b are opposed to the supporting pins 26a9 and 26M which are thrust into the center hole from the actuators 7a and 1b through the slit turtles 8a and the ridges 8b, and the external force RA is As it rises, actuators 7a, 7
b is configured to be pushed up by cams 25a, 25b via pins 26a, 26b.

The pin 26a is attached to the upper end side of the slit tatami mat 8a and the turtle 8b.
, 2 locking steps 27a and 27b on which the locking steps b can be placed and locked.
is formed (see FIGS. 5 and 6), and the pin 2 fin a? is pushed up by the cams 25a and 25b. When the cam 26b comes off the upper end of the slits 18a and 18b, the cam 25
It is configured to be laterally rotated by the inclined surfaces of a and 25b and supported by the locking steps 27a and 27b.

Then, "The actuator 7a? 7b is connected to the locking steps 27a, 27b.
In the locked state, the valves 6a and 60 are set to start, respectively. The upper end of the case is equipped with a disc-shaped movable part 29 for unlocking that can be rotated forward and backward via a support shaft 28.The outer end of this support shaft 28 connects one end to the area heated by the burner 4. The rotary shaft 3 of the fixed spiral bimetal 30 is connected to the rotary shaft 3 via a link mechanism 32. The movable member 29 is shown in FIGS. As shown in the figure, the lock release operation pieces 3 and 34 are pivotably supported from the lower surface so as to be freely retractable, and a lock release operation pin 35 is provided with a hammer. They are each biased to protrude downward. The lock release operation pieces 33 and 34 are one of the actuators 7a.
The lock release operation pin 35 is within the swing locus of the support pin 26a of the other actuator 7b.
It is set to be located within the swing locus b.

Furthermore, "one operating piece 33 is arranged so as to be located radially outward than the other operating piece 34.

A restraining plate 37 is fixed to the upper end of the operating shaft 13, which acts only on the operating piece 34 located radially inward from below and retracts it. In addition, this check plate 37G
The shape is such that it acts on the operating piece 34 only within a certain rotational phase range. Next, this operation will be explained. When the operation knob 12 is rotated from the valve closed state shown in FIG. 1 to the maximum flow rate position and the operation shaft 13 is rotated 180 degrees in the valve direction x,
As shown in FIG. 8, by the action of the inner and outer collars 14; 15, the actuators 7a, 7b are linearly slid upward, and the cams 253, 25b are at the upper limit position of the valve.
The locking step portions 27a, 27b and the pin 2 are rotated laterally at the
6a and 26b, both shutoff valves Va and Vb are kept open as shown in FIG. 9, and fuel gas is supplied to the burner 4.

At the same time, the above-mentioned rapid descent of the external force roller 15 hits the Shoelectric element 24 and activates the ignition device 5, causing the burner to open.
It is ignited on 4th. At this time, the lock release movable part 29 is in the state shown in FIGS. 6 and 7. When the burner 4 is ignited, the bimetal 30 is heated and deformed, the lock release movable member 29 rotates in the x direction, and the lock release operation piece 33
and 34 move to the position shown in FIG. 7 {mouth}.
At this time, the operation pieces 33 and 34 are elastically displaced and the pin 26a
pass through. This condition is normal. Note that the amount of gas supplied at this time is approximately at its maximum, and therefore the check plate 37 at the upper end of the operating shaft 13 is in a position where it does not act on the operating piece 341. When it disappears, the bimetal 30G transforms as it cools.

Along with this, the movable member 29 rotates in the opposite direction y, the operation piece 34 presses the pin 26a to move from the locking step 27a to the slit 18a, and the actuator 7a moves to the spring 101.
As a result, it is rapidly slid downward, thereby closing the shutoff valve Va. Furthermore, when the heated region heated by the burner 4 is overheated and rises above a predetermined temperature in the steady state shown in FIG. 9, the bimetal 30 is further heated and deformed, and the movable member 29 rotates greatly in the x direction. At this time, the operating pin 36 presses the other pin 26b to move from the locking step 27b to the slit 18b, thereby closing only the shutoff valve Vb.Also, when the amount of gas supplied is small, the operating shaft 13 is returned to the opposite y direction after ignition, and the check plate 37 is moved to the position shown in FIG. The lock release operation piece 34 is pushed upward by the check plate 37 and retracted, and only the other operation piece 33 rides on the pin 26a.Here, as mentioned above, when the burner 4 turns off and the movable member 29 rotates in the opposite direction y. , the operating piece 33 acts on the pin 26a, thereby closing the shutoff valve Va. Also, when the burner 4 is overheated and the movable member 29 rotates greatly in the other direction, the operating pin 35 moves to the other pin as described above. 26b to shut off the shutoff valve Vb.
is closed. In other words, one operation piece 34 acts on the pin 26a when the gas supply amount is large, and the other operation piece 33 acts on the pin 26a when the gas flow rate is small.
Therefore, the valve is quickly shut off when the gas goes out regardless of whether the gas flow rate is high or low.

Particularly when the gas flow rate is low, this prevents the shutoff valve Va from being erroneously closed by rotating the operation knob 12 for adjusting the gas flow rate in the closing direction. In addition, since the operating pin 35 acts on the pin 26b against overheating regardless of the magnitude of the gas flow rate, the closer the operating pin 35 is set to the pin 26b, that is, the larger the gas supply amount, the more the valve will be shut off from overheating. time will be shorter. It is also possible to directly attach the valve elements 6a, 6b to the lower ends of the actuators 7a, 7b, and configure the shutoff valves Va, Vb so that the flow passages are opened and closed by vertical movement of the valve elements 6a, 6b.

According to the present invention as described above, it is possible to automatically shut off the outflow of raw gas when the burner 4 is turned off, and it is also possible to automatically shut off the outflow of raw gas when abnormal overheating occurs due to dry firing. . Moreover, these automatic shut-off functions can be easily and reliably set with a single start operation of the operating knob 12, making them easy to handle.Furthermore, since they have a highly durable purely mechanical structure, they are trouble-free. It has the advantage of being safe for long-term use.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1, Fig. 3 is a cross-sectional view taken along line B-B in Fig. 1, Fig. 4 is an exploded perspective view of main parts, and Fig. 5. is a partially cutaway perspective view of the main part,
FIG. 6 is a plan view of the main parts immediately after the ignition operation. Figure 7: Developed side view of the main parts immediately after ignition, Figure 7
Figures {o} and 1 are developed side views showing the steady state after ignition. Fig. 8 is a longitudinal front view of the main part during the valve opening operation, Fig. 9 is a longitudinal sectional front view of the main part after the valve is operated, and Fig. 10 is a longitudinal sectional front view of the main part showing the automatic shutoff operation state when the valve is turned off.Va , Vb...Shutoff valve, 2...
... base automatic shutoff device, 3 ... flow rate adjustment section, 4 ... burner turtle 5 ... ignition device 6a, 6b ... valve, 729
7b... actuator is also 8a, 8b... spiral shaft "IQ...
...Spring "Kubigame"...Case also Takashi 2...Operation knob, 13...Operation ball, 14...Inner collar "16...
...External force collar, 16...Operation collar, 17...Ring"
17a, 17b...Arm of stove 7, 18a? ]8
b...slit, 19...spring, 20...inclined cam, 2
1... Spring, 22... Pin, 23... Inclined recess, 2
5a, 2 boxes b...Rikimu, 26a? 26b...Pin, 27
a, 27b...Locking stepped portion, 28...Spindle also 29...
Movable part village for unlocking, 30... Bimetal, 31...
Rotating shaft, 33, 3 turtle...Lock release operation piece, 36...
・Lock release operation pin. Bonito drawing from Kakuki No. 3 Koji Tsuna 4 faces No. 5 Book@Zutsutsunfu drawing W Blind drawing Lo)

Claims (1)

[Claims] 1. A pair of cutoff valves Va, Vb are arranged in series in the middle of the gas supply flow path to the burner 4, and the cutoff valves Va, Vb respectively control the gas supply flow by rotating or vertically moving the valves 6a, 6b. It is designed to open and close the passage, and each valve 6a
, 6b and actuators 7a, b are connected by shafts 8a, 8b, respectively, so that the valve elements 6a, 6b can be rotated or moved up and down by linear sliding displacement of actuators 7a, 7b. The children 7a and b are attached to the respective valves 6a and 6.
the springs 10, 10 toward the position where b closes the gas supply channel;
The actuator 7a is elastically biased against the springs 10, 10.
, 7b to the position where the valves 6a, 6b open the gas supply flow path, and in this position both actuators 7a, 7b are rotated around the sliding axis to engage the locking step portions 27a, 27b, respectively. Provided with valve opening cams 25a and 26b that lock and lock,
The cams 25a and 25b are interlocked and connected to the operation knob 12, and a movable member 29 for unlocking is provided, which is displaced forward and backward by the deformation force of the bimetal 30 provided on the burner 4, and when the bimetal 30 is deformed by cooling beyond a certain level, the lock release member 29 is disposed. The movable member 29 is displaced in the forward direction to lock one actuator 7a to the locking stepped portion 2.
7a, and when the bimetal 30 is heated and deformed beyond a certain level, the movable member 29 is displaced in the opposite direction to disengage and disengage the other actuator 7b from the locking stepped portion 27b. Automatic gas outflow shutoff device for gas combustion equipment.