JPS60194229A - Thermocouple type gas safety device - Google Patents

Abstract

PURPOSE:To simplify a method for feeding an electric power from a dry cell to a solenoid valve used in a thermocouple type gas safety unit only for a beginning of igniting operation and to delay a consumption of the battery cell by a method wherein a characteristic of electric discharging of a capacitor is utilized. CONSTITUTION:Both solenoid type gas main valve 4 and solenoid type gas safety valve 2 are forcedly contacted to their valve seats only for about 10sec or so until a capacitor C starts to discharge and its effective voltage is decreased. The generated voltage of the thermocouple 13 is gradually increased and its voltage is added to a solenoid type gas safety valve 2. No adding operation is made for the solenoid type gas main valve 4 under an action of the resistor R1. The electric power kept in the capacitor C is gradually discharged. When a voltage applied to the solenoid type gas main valve 4 is decreased to such a degree as its retracting force is diminished, the solenoid type gas main valve 4 is released from the enforcing force, the solenoid type main valve 4 is opened under the action of the spring (d), the gas is flowed to ignite the main burner 19 and the gas instrument is started to operate.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field] The present invention relates to two electromagnetic gas valves and a thermocouple gas safety device using a dry battery and a thermocouple as power sources for operating the gas valves.

[Prior art] Thermocouple type gas safety devices, which are widely used in bathtubs and instant steamers, are used to prevent dangers caused by pilot burners going out. Since the system attempts to keep the safety valve open by the action of electromagnetic force, it is necessary to forcibly close the safety valve by some means until the thermoelectromotive force reaches the desired level. Do not keep it open. Conventionally, this has been accomplished by manually pressing and holding a valve actuation button for a certain period of time, or by relying on power supplied directly from a dry cell battery. However, the manual method is cumbersome to operate, and may be caused by insufficient pressing pressure or
Ignition failures often occurred due to lack of time. In addition, the method of directly using a battery as a power source requires a separate, relatively costly switching mechanism with a timer I to supply control current to the safety valve at a desired time and for a desired period of time, and requires the use of dry batteries. It also consumed quite quickly, and I ignored the hassle of replacing the battery, which only lasted 1q.

[Objective of the invention] The present invention aims to simplify the method of supplying electric power from a dry battery to a solenoid valve used in a thermocouple type gas safety device only during the initial stage of ignition operation, and also to provide a method of delaying battery consumption. be.

[Structure of the Invention] The thermocouple type gas safety device of the present invention includes an electromagnetic gas safety valve that is installed in a gas supply path and becomes an adsorption state by a pressing operation, and has only a self-holding force of the valve body when energized, and an electromagnetic gas safety valve that is provided in a gas supply path and becomes an adsorption state by a pressing operation. state, and has only the self-holding force of the valve body when energized, is electrically connected in parallel with the gas safety valve, and is in a closed state when it is suppressed and adsorbed to the downstream gas supply path,
An electromagnetic gas main valve is provided so as to be in a closed state when the valve is released, and a capacitor is connected in parallel with the capacitor for supplying a discharge current to the gas safety valve and the gas main valve for a certain period of time after the ignition operation. a thermocouple, a resistor to prevent the power generated by the thermocouple from flowing to the gas main valve, a dry battery to charge the capacitor, and an LC mechanism to switch and connect the capacitor to the two electromagnetic valves or the dry battery. The electric well opening/closing electric circuit is composed of a circuit changeover switch, and an interlocking mechanism such as a spindle for interlocking the operation of the circuit changeover switch with the rotation of the ignition operating shaft.

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

b) Combining the conventional electromotive force sensor or timer and switches 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. The structure is significantly simplified compared to the current control means, and the effect of reducing both the volume and cost of the device can be obtained.

(2) By adopting method (a) above, the dry cell battery will be 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 resistors R1 and R2 in the circuit in which the thermal lightning pair and the gas main valve are connected, it is possible to avoid the inconvenience that the electromotive force of the thermal lightning pair acts to close the gas main valve.

The resistors R1 and R2 also serve to adjust the time constant of the capacitor.

2) A switch for switchingly connecting the capacitor that 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. are interlocked through the movement of the ignition operating shaft, which not only simplifies the ignition operation but also completely eliminates the risk of gas leaks and ignition errors.

゛[Example] Next, the thermocouple type gas safety device of the present invention will be explained based on an example shown in the drawings.

The thermocouple type gas safety device of the present invention uses a dry cell DC and a relatively large capacity capacitor that acts as a secondary power source! :, M
It has the role of switching the circuit for supplying the electric power stored in the capacitor C to the electromagnetic gas safety valve 2 arranged in the gas supply path B and the electromagnetic gas main valve 4 provided in the gas supply path B downstream thereof. 2-contact switch SW1 and dry battery DC from Bairotsu 1 to burner ignition sparker 11
a switch SW2 for turning on and off the current to the
It is interlocked with this switch SW2, and the capacitor C
Circuit for charging by dry battery DC (Fig. 1)
and a resistor R1 that controls the discharge of the capacitor C, adjusts the current to the electromagnetic gas safety valve 2 and the electromagnetic gas main valve 4, and prevents the current generated by the thermal lightning pair from flowing into the electromagnetic gas main valve 4. and R2, and a thermocouple 13 for supplying power to the electromagnetic gas safety valve 2.

The arrangement of these main components is not 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 pilot burner 12 is installed beyond that. An ignition device 18 and a thermal lightning pair 13 are assembled adjacent to the pilot burner 12.

Next, the structure and operation of the safety device will be explained with reference to FIG. 3 J5 and FIG. 4, which are a plan view and a longitudinal sectional view.

The overall shape is almost box-shaped, with an ignition operating shaft 1 facing the top surface of the safety device casing A, which is also a gas retention space, and an ignition operating shaft 1 that surrounds this shaft 1 and is provided in contact with each wall surface of the casing A. A gas supply path 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. B
The electromagnetic gas main valve 4 having a valve body 4a and the joint valves 2, 3, and 4 are opened against the force of a built-in spring to keep them closed or open at all times. Ignition operation shaft 1 for applying mechanical force to cause
cam 7.9.10 mounted on cam 7.9.10, as well as cam 7.9.
The interlocking type controls the charging and discharging of a relatively large-capacity capacitor C 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. The main elements are a switch SW2 for switching on and off the power of the switch SWI, ibi, and the pylon 1 to burner ignition device 18, and a spindle 6 that interlocks with the cam 10 to turn on and off the switch SW2, and a thermocouple 13. an ammeter 21 for measuring the electromotive force of
It is configured with a neon lamp 22 for when one sparker is ignited, and a dry cooking prevention switch 23.

The operation of the safety device having the above-mentioned configuration will be sequentially 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 FIG. 1, the electromagnetic gas safety valve 2 is pushed by the spring a and is in the closed state. The pilot burner valve 3 is kept closed by a spring b. The electromagnetic gas main valve 4 is forcibly pushed by the suppression piece 5 and is in a closed state. A pair of interlocking switches SW1 and SW2 causes the spindle 6 to be returned by the action of a spring C.
SW2 is open, and the contact on the charging side of SWl is placed in the closed state. As a method of 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 nearly 90 degrees, that is, until the knob is open.
In the figure, when the ignition operating shaft 1 rotates, the action of the cam 1 turns the protrusion 8 to open 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 force of the spring b. At that time, the cam 10 works to pull the spindle 6 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 is activated, the pilot burner 12 is ignited, and then the thermal lightning pair 13 is ignited. An electromotive force is generated and the finger [1] of the ammeter 21 begins to shake. At this time, 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 22 is also turned on.

The dry battery DC used here is 1.5 cm, and the capacitor C is, for example, 6.8 cm in order to achieve the purpose of the present invention.
A capacitor such as F, 1.8V is required.

The time span in which the power stored in the capacitor can be effectively extracted is 10
Approximately a second is appropriate, and this time 1] is determined by selecting the resistors R1 and R2, the capacitance of the capacitor, 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;
Set the departure time arbitrarily.

b) Prevent the finger of ammeter 21 from swinging due to the current from capacitor 〇 until the moment of ignition.

C) The electromagnetic gas main valve 4 is activated by the electromotive force of the thermocouple 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 disconnection time is longer than the electromagnetic gas safety valve 2. 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>MVP (Resistance of electromagnetic gas main valve 4)
, SVR (1!Resistance of magnetic gas safety valve 2), TCR
(Resistance of thermocouple 13) R1 and R2 may have approximately the same resistance value, MVR.

SVR and TCR have approximately the same resistance value.

The plane and longitudinal sections of the safety device at a time after the ignition operating shaft 1 has been rotated to the terminal position and the discharge voltage of the capacitor C has decreased are shown in the seventh and eighth figures.

For about 10 seconds until 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 C. However, the voltage generated by the thermal lightning pair 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 worshiped. The power held in capacitor C is then gradually released.

When the voltage applied to the electromagnetic gas main valve 4 decreases to such an 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 is turned on by the action of the spring d, and gas flows. 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, SW~2 is switched from the jump to the middle, and SWl is switched from the open to the jump.

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 attracted by the power of the condenser C, but halfway through, the power generated by the thermocouple 13 is added, and the gas continues to be attracted.

When the ignition control shaft 1 is rotated clockwise to bring it to the ``knob stop'' position, the pressure piece 5 is actuated by the action of the cam 9, and the electromagnetic gas main valve 4 is forcibly pushed, thereby opening the main burner. At the same time as the gas supply to the pilot burner 19 is stopped, the pilot burner valve 3 is closed by the cam 9, and the gas supply to the pilot burner 12 is stopped. Thermocouple 13
begins to cool down, the supply voltage to the electromagnetic gas safety valve 2 decreases, the electromagnetic gas safety valve 2 also closes, and the first "knob stop" occurs.
Return to state.

Fig. 9 also shows the thermocouple 13, electromagnetic gas safety valve 2, and electromagnetic gas safety valve 2 while the ignition operating shaft 1 is changed from the ``knob stop'' position to the ``knob open'' position and then back to the ``knob stop'' position. The voltage of the type gas main valve 4, the electromagnetic gas safety valve 2, the electromagnetic gas main valve 4, and the pilot burner valve 3a3J:
The interrelationships among the movements of SW2 and SW2, the function of the sparker 11, and changes in the state of gas supply to the pilot burner 12J3 and the main burner 19 are collectively shown as a horizontal line diagram varying in the vertical axis direction.

Sparker 11 when turned from ``Knob Stop'' to ``Knob Book''
The switch SW2, which allows the dry battery current to flow, is closed, and at the same time, SWl is activated to allow the electricity stored in the capacitor 〇 to flow into the electromagnetic gas safety valve 2 and the electromagnetic gas main valve 4, until the capacitor 〇 finishes discharging. For about 10 seconds, the former is kept open and the latter is kept in the idle state. During this period, the thermocouple 13 heated 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 at which the electromagnetic gas safety valve 2 can be kept open is reached. On the other hand, as the condenser power supplied to the electromagnetic gas main valve 4 weakens, the electromagnetic gas main valve 4 is opened and the main burner 19 starts combustion. When the thermocouple 13 is returned to the "knob" position, the electromotive force of the thermocouple 13 is weakened, the electromagnetic gas safety valve Wi 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]

Fig. 1 is a schematic diagram of the electric circuit that controls the opening and closing of the solenoid valve, Fig. 2 is a schematic diagram of the operating system of the main components of the safety device of the present invention, and Figs. 3 and 4 are the thermoelectric circuit of the present invention. A top view and a vertical cross-sectional view of the safety device when the lowering operating shaft of the twin gas safety device is in the position of the knob closed, and Figures 5 and 6 are also in the position where the ignition operating shaft is in the "knob open" position. Figures 7 and 8 show a top view and a vertical sectional view of the safety device when the capacitor is in the "open" position and the capacitor voltage is low. Top and longitudinal sectional views, Figure 9 is a time chart for explaining the operation, Figures 10 and 11 are time charts for when the voltage of the dry battery is decreasing and when gas is not being supplied. It is. In the diagram: 1... Ignition operation shaft 2... Solenoid gas safety valve 3... Pilot burner valve 4... Solenoid gas main valve 5... Pressing piece 6... Spindle 7.
9.10...Cam 12...Pilot burner
13...Thermocouple 19...Main burner 20...
・Lock pieces a, b. c, d...Spring SWI, SW2...Interlocked switch R1, R2...Resistance A...Casing B.
...Gas supply path C...Condenser DC...Dry cell agent Kenji Ishiguro Figure 9, Figure 101-1

Claims (1)

[Claims] 1) An electromagnetic gas safety valve that is installed in the gas supply path and enters an adsorption state by suppressing operation and has only the self-holding force of the valve body when energized, and an electromagnetic gas safety valve that enters the adsorption state by pressing operation and has only the self-retention force of the valve body when energized. and an electromagnetic gas main valve which is electrically connected in parallel with the gas safety valve and which is provided in the downstream gas supply path so as to be in a closed state when the gas is suppressed or adsorbed, and to be in an open state when the gas is released. , a capacitor for supplying a discharge current to the gas safety valve and the gas main valve for a certain period of time after an ignition operation, a thermo-lightning couple connected in parallel with the capacitor, and a thermocouple that causes the electric power generated by the thermocouple to flow to the gas main valve. an electric circuit for opening and closing the solenoid valve, which is composed of a resistor for charging the capacitor, a dry cell battery for charging the capacitor, and a circuit changeover switch for selectively connecting the capacitor to the two solenoid valves or the dry cell battery; A thermocouple type gas safety device characterized by comprising an interlocking mechanism for interlocking switch operation with ignition operation.