JPS6040568B2 - Gas combustion safety device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas combustion safety device that prevents accidents such as carbon monoxide poisoning when using a heater or other gas appliance.

Conventionally, as this type of device, a safety valve is interposed in the gas supply path that is controlled by a hand pad when the main or pilot burner is ignited, and the safety valve is connected to the combustion flame of the burner or its vicinity after the ignition operation is completed. The valve is controlled by the output signal from the installed combustible gas detection element during normal combustion, and the valve is closed when the signal changes during incomplete combustion to prevent carbon monoxide poisoning accidents due to continued incomplete combustion. Types of prevention are known, but in this case, the output signal is not generated unless the flammable gas detection element is heated to a predetermined operating temperature.
It is necessary to manually keep the safety valve open for a relatively long period of time, several seconds or more, which is required for this heating, which is inconvenient and makes it difficult to use.

In addition, in order to eliminate such inconveniences, there is also known a device that is equipped with a means for forcibly opening the safety valve without manual operation during the heating period of the sensing element, but this method does not prevent ignition failure or ignition. Even if the safety valve blows out later, the safety valve will be forced to open for a long time, resulting in the inconvenience of creating a danger of raw gas being released. It is an object of the present invention to provide a device which eliminates the above-mentioned disadvantages, by interposing a safety valve in the gas supply path which is manually closed off when the burner is ignited. After the ridge ignition operation is completed, the valve is controlled to open by an output signal during normal combustion from a combustible gas detection element placed in or near the combustion flame of the burner, and to open by a signal change during incomplete combustion. A heating flame forming means for forming a heating flame with a large amount of gas in a portion where the combustible gas detection element is arranged during the ignition operation, and a heating flame forming means that gives priority to a signal change from the combustible gas detection element at the end of the ignition operation. and holding means for temporarily holding the safety valve in an open state. Next, embodiments of the present invention will be explained with reference to attached drawings.

In the drawing, 1 indicates a gas supply path that supplies gas to the main burner 2, 3 and 4 indicate a gas tank and a safety valve interposed in the supply path 1, and 3 and 4 are coaxial with each other as shown in the second figure. The main burner 2 is ignited by rotating the operating shaft 5 at the upper end of the top and the main burner 2 via the pressure valve of the safety valve 4 and the pilot burner 2a branched from the gas cock 3.
The ignition was made possible. To explain this in more detail, the operating shaft 5 is rotated to the ignition position against the return spring 5a, and is inserted into and engaged with the slit 5b at its lower end.

The spin 6 is given rotation and an underlay guided by the cam 7 on the outer periphery, and the taper plug 8 inside the gas cock 3
is engaged with the cross pin 6 in the L-shaped groove 10 at the upper end of the connector 9, which is engaged so as to be freely movable downward against the springs 9a and 9b, and thus the rotation and downward movement of the pin 6 are prevented. This is engaged with the horizontal part 10a of the L-shaped groove 10, and the third
Rotation and downward movement are given as shown by solid lines in the figure. In this case, the taper plug 8 is rotated to open with the rotation of the connector 9, and the main and sub gas holes 8a and 8b formed therein are connected to the two burners 2 and 2a. Secondary gas outlet 3a, 3
Opening of the gas valves 12 formed in the passage parts of the main gas holes 8a and 8b by the intermediate constricted part 11a of the operating pestle 11 which is connected to the connector 9 and hangs down from it as it is placed under the connector 9. , and the opening of the safety valve 4 to be described later, both burners 2
, 2a is supplied to the pilot burner 2a via the ignition switch 13, which is closed by the downward movement of the connector 9.
and then the main burner 2, and when the operation shaft 5 is released and the ignition operation is completed, the shaft 5 and therefore the cross pin 6 are returned and rotated slightly due to the return imitation 5a. The gas valve 12 is moved to the vertical part 10b of the L-shaped groove 10, and the connector 9 and the operating punch 11 are moved upward by the springs 9a and 9b as shown by the dotted line in FIG. 3, so that the gas valve 12 is closed. I made it.

Incidentally, ignition may be provided by a piezoelectric ignition device instead of using the ignition switch 13. The safety valve 4 is provided with a gas inlet 7a on one side and has an upper valve body 1 facing the operating valve 11 inside.
4 and an electromagnet 15 housed on the lower side, and when the movement village 11 moves downward during ignition operation, a pressing valve opening operation is applied to the valve body 14 against the spring 14a, and the lower end of the valve punch 14b The suction piece 14c is pressed against the electromagnet 15, and after the valve body 14 is released from the pressing force by the upward movement of the operating pestle 11 upon completion of the ignition operation, the electromagnet 15 is energized and held in the closed valve state by suction. It was assumed that

In the drawing, reference numeral 16 denotes a combustible gas detection element disposed near the combustion flame of the main burner 2, and a signal from the element 16 is inputted to a control circuit 17 to control energization of the electromagnet 15. Here, the combustible gas detection element 16 is a resistance lowering element such as titania that significantly reduces the resistance value due to a reduction in oxygen concentration in the combustion flame or combustion exhaust gas in the vicinity during incomplete combustion, or It consists of an oxygen concentration battery element such as zirconia that generates an electromotive force when it decreases, and the internal resistance of both of them is extremely high at room temperature, several loos of degrees Celsius.
A predetermined detection operation becomes possible by heating the sensor to the operating temperature.

FIG. 4 shows an example of the control circuit 17 when a resistance drop element is used as the combustible gas detection element 16.
When the power switch 19 is closed, the voltage dividing circuits 2 and 8b are connected respectively.
High and low level voltages VH and VL from 0-1 and 20-2,
The detection voltage from the voltage dividing circuit 21 in which the combustible gas detection element 16 is interposed is inputted to the input terminal 18c, and according to the resistance value of the combustible gas detection element 16 during normal combustion, the detection voltage is the voltage between the two levels VH. , VL, and a relatively high voltage "H" is applied to the output terminal 18d of the comparator 18.
The signal is output, the transistor 22 is made conductive, and the electromagnet 15 is energized; however, due to the resistance drop of the combustible gas detection element 16 during incomplete combustion, the detection voltage exceeds the upper limit level voltage VH. A relatively low voltage "L" signal is output to the output terminal 18d, the transistor 22 becomes non-conductive, and the electricity to the electromagnet 15 is cut off. still,
When a misfire occurs, the detection voltage drops below the lower limit level voltage VL due to an increase in the resistance value due to the temperature drop of the detection element 16, and an "L" signal is similarly output to the output terminal 18d, and the electromagnet 15
Power is cut off. Although the above is not particularly different from the conventional type described above, according to the present invention, the heating flame forming means 23 forms a heating flame with a large amount of gas at the location where the combustible gas detection element 16 is arranged during the ignition operation. has been established. That is, the means 2
3 connects the pilot burner 2a to the combustible gas detection element 1
When the main burner 2 is ignited via the pilot burner 2a by the ignition operation by rotation of the operating shaft 5, both burners 2, The configuration is such that the combustion flames from 2a collide at the location where the combustible gas detection element 16 is arranged.

In this way, the heating of the combustible gas detection element 16 is significantly accelerated by the heating flame with a large amount of gas, which is the colliding flame, and the time required to heat the detection element 16 is reduced from a few seconds to less than one inkstone. However, since the heating flame causes incomplete combustion, when the nuclear detection element 16 is heated to the operating temperature, the detection voltage increases as shown in FIG. , an "L" signal is output to the output terminal 18d of the comparator 18 as shown in FIG. 5b.

This "L" signal is the operating pestle 11 at the end of the ignition operation.
Even if the heating flame is extinguished by cutting off the gas supply to the pilot burner 2a by closing the gas valve 12 due to the upward movement, the detection voltage continues for a transient time T of about 1 second during which the detection voltage drops to the upper limit level voltage VH. During this time, the electromagnet 15 of the safety valve 4
If the pressing force of the safety valve 4 against the valve body 14 is released immediately after the ignition operation is terminated, the safety valve 4 will close unnecessarily.

Therefore, in the present invention, in addition to the heating flame forming means 23, a holding means 24 is provided which temporarily holds the safety valve 4 in the closed valve state at the end of the ignition operation, giving priority to the signal change at the time of incomplete combustion.

That is, the holding means 24 holds the operating punch 11 and the connector 9 in order to suppress the upward movement of the operating punch 11 at a low speed when the ignition operation is completed.
and the brake pieces 25 and 26 provided on the safety valve 4 and the valve village 1 of the safety valve 4.
4b, and relatively large play 27, 28 provided on the roughened part of the adsorption valve 14c.When the safety valve 4 is pressed open, the valve body 14 has play as shown in FIG. 2b. The gas valve 12 is opened as shown in FIG. The upward movement of 27 and 28 minutes of play allows this to be released from the valve body 14 as shown in FIG. 2d.

In this way, a pressing force is applied to the valve body 14 until the operating village 11 moves upward from the position shown in FIG. 2c to the position shown in FIG. In conjunction with the upward movement, the safety valve 4 is held open during the transition time T, and thereafter the safety valve 4 is held in a closed valve state by energizing the electromagnet 15, thereby preventing oxygen deficiency, poor equipment maintenance, etc. In preparation for valve closure in the event of incomplete combustion or misfire.

FIG. 6 shows a pilot burner 2 in which a combustible gas detection element 16 is arranged opposite to a pilot burner 2b for normal flame installed in parallel with the main burner 2, and serves as a heating flame forming means 23 during ignition operation.
Both burners 2a and 2b are placed at the location where the detection element 16 is arranged by a.
As shown in FIG. 7, the gas cock 3 is provided with a pilot gas outlet 3c that extends to the pilot burner 2b, and gas is supplied to this through the main gas hole 8a of the taper plug 8. I decided to make it compulsory.

There is no other difference from the above embodiment. In FIG. 8, the auxiliary gas outlet 3b and the pilot gas outlet 3c of the gas cock 3 shown in FIG. Burner 2b
In this case, the heating flame forming means 23 is constituted by the gas valve 12.

FIG. 9 shows a control circuit 17 in which a timer circuit using a capacitor 30 is incorporated to electrically form the holding means 24. To explain this, the timer circuit 24, which is a holding means, receives the level voltage from the voltage dividing circuit 32 at the level terminal 31a of the comparator 31, and the charging voltage of the capacitor 30 from the charging circuit 33 for the capacitor 30 at its input state 31b. The output terminal 31c and the output terminal 18d of the comparator 18 are connected to each diode 34,
35, which is connected to the transistor 32 in common through the charging circuit 33 and the capacitor 30, and is connected to the charging circuit 33 in parallel with the capacitor 30, and is connected to a closed circuit when the ignition operation is performed, and a short circuit which is connected to the ignition switch 13 at the end of the operation, for example, and which is connected to the transistor 32 in common. When the switch 36 is connected and the ignition operation is completed, the output terminal 31 is charged during the charging time until the charging voltage exceeds the level voltage due to charging of the capacitor 30 due to the passage of the short circuit switch 36.
The transistor 22 is made conductive and the electromagnet 15 of the safety valve 4 is energized regardless of the "L" signal outputted to the output terminal 18d of the comparator 18. Thus, if the charging time is set in accordance with the transient time T, the safety valve 4 is kept open until the "H" signal for normal combustion is generated from the comparator 18 after the heating flame is extinguished. No unnecessary valve closing occurs.

In this case, the power switch 19 and the comparator 1
An indicator 29 made of a light emitting diode is connected between the output terminal 18d of the combustible gas detection element 16 and the output terminal 18d of the combustible gas detection element 16. The heating flame that causes incomplete combustion as the element 16 is heated to a predetermined operating temperature causes a signal to be generated at the output terminal 18d.
The "L" signal is output, the display 29 lights up, and the function of the detection element 16 and control circuit 17 is inspected.

In other words, if the indicator 29 should light up when the ignition is operated, it is confirmed that a dangerous malfunction has occurred in which the "L" signal is not output even due to incomplete combustion. It is possible to prevent carbon oxide poisoning accidents from occurring. Also, according to this lighting, the combustible gas detection element 16
It also confirms that the has been heated to the predetermined operating temperature.
It is also useful for indicating the end time of ignition operation. In the above embodiment, a resistance drop element is used as the combustible gas detection element 16, but an oxygen concentration battery element may also be used, and when the holding means 24 is mechanically configured, The structure is not limited to the one in the above embodiment, but it is also possible to use a cam or the like.

As described above, according to the present invention, a heating flame with a large amount of gas is formed in the area where the combustible gas detection element is arranged by the heating flame forming means activated during the ignition operation to promote heating of the detection element. The time required for manually pressing the valve can be reduced.
In addition, the safety valve is held open by the holding means even when the signal changes during incomplete combustion, which is transiently generated from the detection element at the end of the ignition operation, and the safety valve is not closed unnecessarily. It is sufficient to operate the holding means for a short period of time from extinguishing the heating flame until a signal indicating normal combustion is output, and the time during which the safety valve is kept open without receiving a signal from the combustible gas detection element can be significantly shortened. This has the effect of preventing as much as possible the danger of raw gas being released due to misfires, etc. during that time.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a line diagram of one example of the device of the present invention, Figs. 2 a, b, c, and d are cutaway side views illustrating the operation of its main parts, and Fig. 3 is a diagram of its component parts. A partial cross-sectional view, FIG. 4 is its electrical circuit diagram, FIGS. 5 a and b are diagrams showing the characteristics of the combustion detection element, FIG. 6 is a diagram of another embodiment, and FIG. FIG. 8 is a cutaway side view of the part, and FIG. 9 is a diagram of another embodiment.
The figure is an electric circuit diagram showing another embodiment.

1...Gas Tosonshaji, 2...Main burner, 2
a...Pilot burner, 2b...Pilot burner, 4...
...Safety valve, 16...Flammable gas detection element, 2
3... Heating flame forming means, 24... Holding means, 29... Display device.

Figure 1 Figure 4 Figure 5 Figure 6 Figure 2 Figure 3 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] 1. A safety valve that is manually opened during the ignition operation of the burner is interposed in the gas supply path, and after the ignition operation is completed, the safety valve is placed in the combustion flame of the burner or in the vicinity. In a type that controls opening of the valve by an output signal during combustion and closing of the valve by a signal change during incomplete combustion, a heating flame with a large amount of gas is formed at the location where the combustible gas detection element is arranged during the ignition operation. A gas combustion safety device comprising: heating flame forming means for forming a heating flame; and holding means for temporarily holding the safety valve in an open state in priority to a signal change from the combustible gas detection element at the end of the ignition operation. .