JPS60194228A - Thermocouple type gas safety device - Google Patents

Abstract

PURPOSE:To simplify a mechanism for feeding electricity for keeping a solenoid valve positively under either an opened condition or closed condition for a specified period of time and at the same time to delay a consumption of dry cell by a method wherein the valve is kept opened by a capacitor only for the beginning of an ignition operation and the gas safety valve is continued to be kept in its opened condition or closed condition positively for a desired period of time. CONSTITUTION:When the knob is rotated from its ''knob stop'' to ''knob open'', a switch SW2 for feeding an electric current of dry cell to a sparker 11 and at the same time SW1 is cooperatively acted to cause an electric power stored in a capacitor C to be flowed to a solenoid type gas safety valve 2 and a solenoid type gas main valve 4, the former is continued to be kept at its open condition for about 10sec and the latter is continued to be kept closed for about 10sec until the capacitor C is finished to discharge. During this period, a thermocouple 13 heated by an ignited pilot burner 12 gradually increases an electromotive power and reaches to such a level for keeping a solenoid type gas safety valve 2 in its open condition within at least ten seconds after igniting operation. In turn, the solenoid type gas main valve 4 is released by a decreased electric power in the capacitor fed to the solenoid type gas safety valve 4 and then the main burner 19 is started to ignite.

Description

Detailed Description of the Invention [Field] The present invention relates to a 1u magnetic gas valve and a thermocouple gas safety device using a dry cell and a thermocouple as the operating power source of the gas valve.
Ru.

[Prior art] Thermocouple gas safety devices, which are widely used in bathtubs, instant water heaters, etc., are used to prevent the risk of gas leakage due to the pilot burner going out. This is because an electromagnetic force is used to keep an electromagnetic gas safety valve, which normally remains closed, in an open state until the thermoelectromotive force reaches the desired level. The gas safety valve must be forced open by some means. Keep the electromagnetic gas safety valve and the electromagnetic gas main valve open or closed for a certain period of time at the beginning of the ignition operation, that is, until the electromotive force of the thermocouple is sufficiently increased and until the gas main valve is ignited. Conventionally, the method for continuing this operation has been to manually press and hold the valve actuation button for a certain period of time, or to rely on power supplied directly from a dry cell battery. However, manual methods require complicated operation, and ignition failures often occur due to insufficient pressing pressure or insufficient pressing time. In addition, a lock EUI that uses a battery directly as a power source requires a relatively costly switching mechanism with a thermocouple electromotive force sensor, a timer mechanism, etc. to supply control current to the safety valve for a desired period of time, or a separate switching mechanism such as a timer mechanism. I had to prepare them, and the batteries used up pretty quickly, so I couldn't ignore the hassle of replacing them.

[Object of the Invention] The present invention relates to an electromagnetic gas safety valve or an electromagnetic gas main valve, and a thermocouple gas safety device that uses a dry battery and a thermocouple as the operating power source of the electromagnetic valve, and which is limited to the initial stage of ignition operation. Then, power is supplied to ensure that the one or two solenoid valves are kept open or in the fWJ valve state for a desired period of time (4!). The objective is to simplify the I-structure and provide a method for delaying battery consumption.

[Configuration of the Invention] The thermocouple gas safety device of the present invention includes an electromagnetic gas safety valve,
A thermocouple for supplying operating power to the gas safety valve, a capacitor connected in parallel with the thermocouple, a dry battery for charging the capacitor, and a circuit changeover switch for connecting the capacitor to the dry battery or the gas safety valve. The combination is kept open by a capacitor only at the beginning of the ignition operation, and thereafter by the thermoelectromotive force of a thermocouple placed close to the pilot burner? ) The configuration is such that the gas safety valve described in ff continues to be maintained in the same state.

According to a more preferred configuration of the present invention, the thermocouple type gas safety device of the present invention is an electromagnetic type gas safety valve that is provided in a gas supply path and enters an adsorption state by a suppression operation, and controls only the self-holding force of the valve body when energized. Then, due to the suppression operation, it becomes an adsorption state,
The valve body only has self-retention when energized, and is electrically connected in parallel with the gas safety valve, and is in a closed state when it is pressed and attracted to the downstream gas supply path, and is in an open state when it is removed. An electromagnetic gas main valve installed in the
a thermocouple disposed close to the pilot burner for energizing the gas safety valve; and connected in parallel with the thermocouple;
The gas safety valve is provided with a capacitor for energizing the gas safety valve and the gas main valve, and a dry 2Hs for charging the capacitor, and the gas safety valve is kept open by the discharge current of the capacitor at the beginning of ignition. Then, the gas main valve is maintained in the open state by the output of the thermal lightning pair, and the gas main valve is kept in the closed state by the action of the condenser until the gas main burner is ignited after the ignition operation. It is composed of

[Effects of the Invention] With the above configuration, the thermocouple type gas safety device of the present invention has the following effects.

b) By utilizing the discharge characteristics of the capacitor only during the period until the thermoelectromotive force generated by the thermocouple reaches the required level at the initial stage of ignition operation, a conventional electromotive force sensor or a combination of a timer and switches can be used to generate current. The structure is significantly simplified compared to the control means, and the effect of reducing both the volume and cost of the device can be obtained.

(2) By implementing method (a) above, the dry cell battery is used only for charging the capacitor, extending the life of the battery and greatly reducing the time and effort required to replace the battery.

c) By interposing the resistors R1 and R2 in the circuit in which the thermocouple and the gas main valve are connected, it is possible to avoid the inconvenience that the electromotive force of the thermocouple acts on the closing of the gas main valve. The resistors R1 and R2 also serve to adjust the time constant of the capacitor.

2) A switch for connecting the condenser, which supplies operating power to the two electromagnetic gas valves, to the charging or discharging circuit at the beginning of the ignition operation, and a switch for intermittent current to the pilot burner ignition device. Since the switch is placed in an interlocking relationship through the movement of the ignition operating shaft, the ignition operation can be extremely simplified, and the risk of gas leakage and ignition errors can be completely eliminated.

[Example] Next, the thermocouple type gas safety device of the present invention will be described based on an example, which is not shown in the drawings.

The thermocouple type gas safety device of the present invention consists of a dry battery DC, a relatively large capacity capacitor υ-〇 that serves as a secondary power source, and an electromagnetic gas A two-contact switch SW1 has the role of switching a circuit for supplying to the safety valve 2 and the electromagnetic gas main valve 4 provided in the gas supply path B downstream thereof, and a dry battery D.
A 1C switch SW2 that turns off the current from C to the pilot burner ignition sparker 11 by 0N, and a circuit that is interlocked with this switch SW2 and charges the capacitor 〇 with a dry battery DC (Fig. 1).
Controls the discharge of capacitor 〇, adjusts the current to the electromagnetic gas safety valve 2 and the electromagnetic gas main valve 4, and
It consists of a thermocouple 13 for supplying electric power to the electromagnetic gas safety valve 2, resistors R1 and R2 for preventing the current generated by the thermocouple from flowing into the electromagnetic gas main valve 4.

The arrangement of these main components is shown in FIG.

An electromagnetic gas main valve 4 is interposed in the gas supply path B downstream of the electromagnetic gas safety valve 2, and a main burner 19 is provided beyond the electromagnetic gas main valve 4. Further, downstream of the electromagnetic gas safety valve 2, a pilot burner valve 3 is installed in parallel with the electromagnetic gas main valve 4, and a pylon 1-burner 12 is attached beyond that. An ignition device 18 and a thermocouple 13 are assembled adjacent to the pilot burner 12.

Next, the structure of the safety device 416 and its operation will be explained with reference to FIGS. 3 and 4 as a plan view and a longitudinal sectional view thereof.

The ignition operating shaft 1 is attached to the top surface of the safety device casing A, which is almost box-shaped as a whole, and is also a gas retention space, and the ignition operation shaft 1 is provided in contact with each wall surface of the casing A surrounding this shaft 1. A gas supply path B downstream of the electromagnetic gas safety valve 2 equipped with a valve body 2a that controls opening and closing of the gas inlet, the pilot burner valve 3, and the electromagnetic gas safety valve 2 for introducing and shutting off gas to the main burner 19.
The electromagnetic gas main valve 4, which is interposed between the Ignition operation shaft 1 that applies mechanical force for release
cam 7.9.10 mounted on cam 7.9.10, as well as cam 7.9.
10, and an interlocking switch SW1 that controls the charging and discharging of a relatively large capacity capacitor C that is charged by a dry battery DC for supplying current for opening and closing the solenoid valve at a desired time and for a required period of time. and a switch SW2 for turning on and off the power of the pilot burner ignition device 18, and a cam 10 for turning the switch SW2 ON and OFF.
The main element is a spindle 6 that interlocks with the thermocouple 13, and an ammeter 21 for measuring the electromotive force of the thermocouple 13, a neon lamp 22, 83 for igniting a sparker, and a dry heating prevention switch 23. ing.

The operation of the safety device having the above-mentioned structure will be explained below.

Figures 3 and 4 depict the plane and longitudinal section of the safety device when the ignition operating shaft 1 of the safety device is in the “knob stop” position, as well as an electric circuit diagram that controls the opening and closing of the solenoid valve. In Figure 1, the electromagnetic gas safety valve 2
It is pressed by spring a and is in the closed state. The pilot burner valve 3 is kept closed by the spring b. The electromagnetic gas main valve 4 is forcibly pushed by the pressing piece 5 and is in a closed state. A pair of switches SW1 and S in an interlocking relationship
At W2, the spindle 6 is returned by the action of the spring C, and the S
W2 is open, and the contact on the charging side of SWl is closed.

As a method for interlocking the switches SW1 and SW2, another interlocking mechanism may be used instead of the spindle 6.

Next, Figures 5 and 6 depict the plane and longitudinal section of the safety device when the ignition operating shaft 1 is rotated counterclockwise to nearly 90 degrees, that is, to the "knob open" state, and Figure 1
In the figure, when the ignition operating shaft 1 rotates, the action of the cam 7 turns the protrusion 8, opening the electromagnetic gas safety valve 2, and the action of the cam 9 causes the pilot burner valve 3 to begin to open against the spring b. At this time, the cam 10 acts to pull the spindle θ against the spring C, and the two switches SW1
, the respective circuits of SW2 are switched, current flows through the electromagnets of the electromagnetic gas main valve 4 and the electromagnetic gas safety valve 2, the sparker 11 works, the pilot burner 12 ignites, and then an electromotive force is generated in the thermal lightning pair 13. occurs, and the pointer of the ammeter 21 begins to swing. Then, the electromagnetic gas safety valve 2 and the electromagnetic gas main valve 4 are forcibly absorbed by the electric power held by the relatively large capacitor C, and the neon lamp 2
2 is also lit.

Here, a dry cell DC of 1.5V is used, and a capacitor C of, for example, 6.8V is used to achieve the purpose of the present invention.
A capacitor such as F, 1.8V is required.

10 during the time when the power stored in the capacitor can be effectively extracted.
Approximately a second is appropriate, and this time is determined by selection of resistors R1' and R2, capacitor capacity, etc.

The functions of the resistors R1 and R2 are a) limiting the current from the capacitor C to the electromagnetic gas safety valve 2 and the electromagnetic gas main valve 4;
The departure time can be set arbitrarily.

b) HFE from capacitor C prevents the ammeter 21 pointer from swinging until ignition.

C) The electromagnetic gas main valve 4 is activated by the electromotive force of the thermal lightning pair 13.
prevent it from continuing to be adsorbed.

Three points can be raised. Even if the resistance value is R1-R2, since the ammeter 21, dry boiling prevention switch 23, etc. are connected in parallel to the electromagnetic gas safety valve 2, the release time (m) is shorter than the electromagnetic gas safety valve 2. 4 is longer. Electromagnetic gas main valve 4 from electromagnetic gas safety valve 2
If the withdrawal time is not set long, safety problems will occur.

For the reasons mentioned above, the relationship between the resistance values of the electric circuit components must be determined as follows.

R1, R2>MVR (resistance of electromagnetic gas main valve 4)
, SVR (resistance of electromagnetic gas safety valve 2), TCP (resistance of thermocouple 13) R1 and R2 have almost the same resistance value, MVR.

SVR and TCR have approximately the same resistance value.

Seventh and eighth diagrams show the planar and longitudinal sections of the safety device after the ignition operating shaft 1 has been rotated to the am position and the discharge voltage of the capacitor C has decreased.

During the approximately 10 seconds before the capacitor C starts discharging and its effective voltage drops, the electromagnetic gas main valve 4 and the electromagnetic gas safety valve 2 are forcibly attracted by the electric power held by the capacitor 〇. However, the voltage generated by the thermocouple 13 also increases gradually, and this voltage is added to the electromagnetic gas safety valve 2. The electromagnetic gas main valve 4 is activated by the action of the resistor R1.
will not be added to. Then, the power held in capacitor 〇 is gradually released.

When the voltage applied to the electromagnetic gas main valve 4 decreases to the extent that it loses its adsorption holding force, the electromagnetic gas main valve 4 is released from the forced force, and the electromagnetic gas main valve 4 opens by the action of the spring d, allowing gas to flow. The main burner 19 is ignited, and the gas appliance is put into use. At the same time, the lock piece 20 is released by the action of the spring d, the spindle 6 is returned by the spring C, and SW2 is switched from closed to open, and SW1 is switched from closed to closed.

Then, the sparker 11 stops, the neon lamp 22 goes out, and charging of the capacitor C starts. At first, the electromagnetic gas safety valve 2 is forcibly adsorbed by the electric power of the condenser 〇, but halfway through, the electric power generated by the thermocouple 13 is added, and the adsorption continues as it is.

“When bringing the knob to the stopper position, rotate the ignition operating shaft 1 clockwise, and the suppressing piece 5 will be moved by the action of the cam 9.
is activated, the electromagnetic gas main valve 4 is forcibly pushed, and the gas supply to the main burner 19 is stopped.At the same time, the cam 9
As a result, the pilot burner valve 3 is closed and the gas supply to the pilot burner 12 is stopped. The thermocouple 13 then begins to cool down, the voltage supplied to the electromagnetic gas safety valve 2 drops, and the electromagnetic gas safety valve 2 also closes, returning to the initial "knob stop" state.

Figure 9 also shows the ignition operating shaft 1 being moved from the "knob stop" position to "
The voltages of the thermal lightning pair 13, the electromagnetic gas safety valve 2, and the electromagnetic gas main valve 4, and the voltages of the electromagnetic gas safety valve 2 and electromagnetic gas during the time when the knob is changed to the ``knob open'' position and then changed to the ``knob stop'' position. Main valve 4, pilot burner valve 3 and SW
2, the function of the sparker 11, and the interrelationships of changes in the gas supply state to the pilot burner 12 and the main burner 19 are collectively shown as a horizontal line diagram varying in the vertical axis direction.

Sparker 1 without turning from ``knob stop'' to ``knob stop''
Switch SW2, which allows dry cell current to flow through 1, is closed, and at the same time, SW1 is interlocked to allow the electric power stored in capacitor 〇 to flow into electromagnetic gas safety valve 2 and electromagnetic gas main valve 4, until capacitor C finishes discharging. Hold the former open and the latter closed for about 10 seconds. During this period, the thermal lightning pair 13, which was heated again by the pilot burner 12 that was ignited, gradually increases its electromotive force, and at least once after the ignition operation.
Within 0 seconds, the level for keeping the electromagnetic gas safety valve 2 open is reached. On the other hand, electromagnetic gas main valve 4
The electromagnetic gas main valve 4 is opened due to the weakening of the condenser power sent to the main burner 19, and the main burner 19 starts combustion. When the thermocouple 13 is returned to the "locked" position, the electromotive force of the thermocouple 13 weakens, the electromagnetic gas safety valve 2 is closed by the spring force, and the electromagnetic gas main valve 4 is mechanically blocked.

Figures 10 and 11 show changes in the voltage or position of each main component on the ignition operating axis when the voltage of the dry battery DC is decreasing and when gas is not being supplied, similar to Figure 9. This is a time chart graphed in response to the movement of No. 1, and it can be seen that all of them operate with fail safety.

[Brief explanation of drawings]

Figure 1 shows the solenoid valve R1! Figure 2 is a schematic diagram of the operating system of the main components of the safety device of the present invention, and Figures 3 and 4 are the lowering operation of the thermocouple type gas safety device of the present invention. The top view J5 and longitudinal sectional views of the safety device when the shaft is in the "locked" position, as well as FIGS. 5 and 6, are also shown when the ignition operating shaft is brought to the "knob open" position. The top view and cross-sectional view of the safety device when the discharge voltage of the capacitor is sufficiently high, and Figures 7 and 8 show the top view and cross-sectional view of the safety device when the capacitor voltage has decreased when the safety device is in the fully open position. A vertical cross-sectional view, FIG. 9 is a time chart for explaining the operation, and FIGS. 10 and 11 are time charts 1 to 1 when the voltage of the dry battery is decreasing and when gas is not supplied. In the diagram: 1... Ignition operation shaft 2... Electromagnetic gas safety valve 3... Pylon 1 to burner valve 4... Electromagnetic gas main valve 5... Pressing piece 6... Spindle 7
．． 9.10...Cam 12...Pilot i~Burner 13...Thermocouple 19...Main burner 20
...Lock pieces a, b. C1d...Spring SWl, SW2...Interlocked switch R1, R2...Resistance A...Casing B.
...Gas supply path C...Condenser DC...Dry cell agent Kenji Ishiguro Figure 1 Figure 3 Figure 2 Figure 9 Figure 10

Claims (1)

[Claims] 1) An electromagnetic gas safety valve, a thermocouple for supplying operating power to the gas safety valve, a capacitor connected in parallel with the thermocouple, a dry battery for charging the capacitor, and a capacitor. It consists of a dry battery or a circuit changeover switch for connecting to a gas safety valve, and is kept open by a capacitor only at the beginning of the ignition operation, and after that, the gas is A thermocouple type gas safety device that is characterized by keeping a safety valve open. 2) An electromagnetic gas safety valve that is installed in the gas supply path and enters a suction state by pressing operation and has only the self-retention force of the valve body when energized, and an electromagnetic gas safety valve that enters the adsorption state by suppressing operation and has only the self-retention force of the valve body when energized. an electromagnetic gas main valve that is electrically connected in parallel with the gas safety valve and is provided in a downstream gas supply path so as to be in a closed state when it is pressed and adsorbed, and to be in an open state when it is released; a thermocouple disposed close to the pilot burner for energizing the gas safety valve; a capacitor connected in parallel with the thermocouple for energizing the gas safety valve and the gas main valve; and a capacitor for charging the capacitor. The gas safety valve is kept open by the discharge current of the capacitor at the beginning of ignition, and then continues to be kept open by the output of the thermocouple.
The thermocouple type gas safety device is characterized in that the gas main valve is held open by the action of the condenser until the gas main burner is ignited after ignition.