JPS6129620A - Gas control device - Google Patents

Abstract

PURPOSE:To prevent a dangerous condition for discharging unburnt gas by a method wherein a shape of the cam is set in such a way as a pilot valve is opened after the once-opened safety valve is closed again. CONSTITUTION:When an operating shaft 6 is reached to a position where it is rotated by about 90 deg., a mechanical valve opening force once applied to the solenoid safety valve 1 due to a specified shape of the cam 7 is lost. Thereafter, the pilot valve 5 is opened under an action of the cam 8 and at the same time an opening and closing cam 10 for a power supply switch SW2 for use in operating the igniter 13 for the sub-burner is operated to an ignition starting side. As a final step, the main valve 4 is opened as the cam 8 is rotated, the main burner is ignited with the sub-burner and then the gas combustion equipment is set to its operating condition. With this arrangement, it is possible to prevent a dangerous condition of discharging of unburnt gas.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a safety ignition device for gas combustion appliances such as gas bathtubs and gas instantaneous water heaters.

[Prior Art] The main components of the ignition system for household gas combustion appliances are a main burner, an auxiliary burner that is constantly ignited as a source of spark when the main burner is ignited again after the main burner has stopped being used, and both It consists of gas valves for each burner, a normally closed electromagnetic safety valve installed at the gas inlet to the device, and a burner igniter, and these three gas valves are connected to the device. It is configured to open and close in a timely and appropriate manner by the movement of several cams on the ignition operating shaft, but the rotation of the operating shaft stops while the ignition operating shaft is being operated from stop to open. If the igniter's power supply voltage happens to drop, or the battery is exhausted, the ignition function will be lost if the igniter's power supply voltage happens to drop when the igniter stops rotating due to a malfunction, or if the igniter stops rotating due to some kind of malfunction. Therefore, the auxiliary burner, which was left open due to the action of the cam, did not ignite, causing the inconvenience that raw gas continued to be released.

[Technical Problem] As explained in the section of the prior art, there is a combustion device in which a gas safety valve is provided upstream of two gas valves for the main burner and the auxiliary burner. Conventional combustion control devices for gas appliances control the opening and closing of these three gas valves by the action of a cam, but the shape of the cam was not designed appropriately, so for some reason the ignition operating shaft could not be opened from the rest position. If the rotation stops during operation toward the position, there is a risk that raw gas will continue to flow from the auxiliary burner, so it is an object of the present invention to improve the cam shape and eliminate this concern.

As a solution to the above problem, in the present invention, the safety valve is opened again in the process of rotating the ignition operating shaft from the stop position to the open position, and then the auxiliary burner is opened again. The cam shape was set so that the valves from pylon 1 of When returning the valve to the stop position, if for some reason the operating shaft returns to before the point at which the pilot valve starts opening, but does not return to the ignition starting position and the rotation of the operating shaft is stopped midway, The pilot valve and main valve close to extinguish the fire, but the igniter switch cannot be activated by the cam mechanism.Under this condition,
As mentioned above, when the ignition operating shaft is moved back in the direction of ignition, the igniter does not work, but the safety valve remains open due to the residual heat from the thermocouple, and the pilot valve and main valve are opened by the action of the cam. As a result, a situation arises in which raw gas is released. In addition, if ignition starts after the opening of the pylon 1 valve, in the process of operating the ignition operating shaft from stop to open, if the shaft rotation stops before ignition starts and after the pilot valve opens. In some cases, raw gas may be released from the auxiliary burner. It is an additional object of the present invention to prevent such inconveniences.

[Technical Means] The configuration of the present invention is shown in FIG. 2 as a conceptual layout diagram of the main components of the device of the present invention, FIG. 3 as an operation time chart of these components, and FIG. 3 as an electric circuit diagram for operating the device. This will be explained below with reference to FIG. Furthermore, the fifth
Figures 8 through 8 show the structure of the device showing the shape of the nojum and its operating mechanism.

The electromagnetic safety valve 1 installed at the gas inlet to the device is of a type that is forcibly opened by the electromotive force of a thermocouple 2 heated by the auxiliary burner, and is connected to a separate power source when the auxiliary burner starts igniting. At the same time, the cams 7, 8 and 9 attached to the ignition operating shaft 6 open and close the electromagnetic safety valve 1, the pilot valve 5 for the sub-burner, and the main valve 4 for the main burner, respectively. In the gas combustion control device, in the process of rotating the ignition operating shaft 6 from the stop position to the open position, the pilot valve 5 is opened again after the electromagnetic safety valve 1 that was opened on - day The shapes of the cams 7 and 9 are set so that the valves are opened.

Further, an ignition operating shaft 6 is provided for operating the igniter activation switch SW2 so that the sub-burner igniter 13 is started after the pilot valve 5 is opened and before the main valve 4 is subsequently opened. The shape of the cam 10 attached to is set.

[Operation] Based on Figures 3 and 1 shown in the technical means section,
The operation of the device of the present invention will be explained below with reference to other figures.

In FIG. 3, which shows the operation time chart of the main components of the device, the horizontal axis represents the rotation angle of the ignition operating shaft 6, and the rotation angle of the ignition operating shaft 6 is shown as the rotation angle of the stop device from 00 to the open position rotated by 180 degrees.
In the process of gradually rotating the operating knob, the electromagnetic safety valve 1 is first mechanically opened by the action of the cam 7, and then the safety valve 1 is connected to another power source other than the thermocouple 2, in this case the DC power source 11. J: The power switch SW1 for forcing the valve to open is turned on by touching the cam 10 attached to the ignition operating shaft 6. Operation axis 6 is approximately 90°
When the rotated position is reached, the mechanical valve-opening force once applied to the electromagnetic safety valve 1 due to the specific shape of the cam 7 is lost. After that, the pilot valve 5 is opened by the action of the cam 8, and at the same time, the opening/closing cam 10 of the power switch SW2 for operating the igniter 13 of the sub-burner works to start the ignition. Then, in the final stage, the main valve 4 is opened as the cam 8 rotates, the main burner is ignited by the auxiliary burner, and the gas combustion appliance enters the operating state.

[Example] In Fig. 1, which is an electrical circuit diagram for operating the device of the present invention, a capacitor 3 is connected to an electromagnetic safety valve 1 so that the electromotive force of a thermocouple 2, which serves as a power source for maintaining the valve, is connected to the electromagnetic force of the electromagnetic safety valve 1 after the auxiliary burner valley fire. Battery power supply 1 to keep the valve open until the required level is reached
Functions as a timer for time-limited energization. Further, when the power supply switch SW2 is turned on to the igniter 13, the capacitor 12 functions as a timer for operating the relay 14 of the circuit opening/closing relay contact 15 interposed in the power supply circuit.

FIG. 2 is a conceptual diagram illustrating the arrangement of the main components of the apparatus of the present invention, in which 17 is a discharge section of the igniter 13, 18 is a sub-burner, and 19 is a main burner.

In FIG. 5 as a cross-sectional view of the device of the present invention, FIGS. 6 and 1 as side sectional views of two locations, and FIG. 8 as a side view, 21 and 22 indicate the electromagnetic safety valve 1 and 23 and 24 are actuating solenoids for the main valve 4, push rods for transmitting the movements of the actuating cams 7 and 8 to the valves 1 and 4, respectively; A group of springs for keeping the cam and the valve in a linked operating state; 27 and 28 are the pressure rods and valve closing springs for operating the pilot valve 5; 29, 30 and 31 are gas supply pipes to the device, respectively; This is a joint for connecting the sub-burner and the main burner, and 20 is a casing of the device.

[Effect of the invention] A normally closed electromagnetic safety valve is kept open by the electromotive force of a thermocouple heated by a sub-burner, and a separate power source is used until the thermoelectromotive force generated by the thermocouple reaches the required level. This is a type of gas combustion control device that keeps this valve open and ignites the auxiliary burner.The electromagnetic safety valve, the pilot valve for the auxiliary burner, and the main valve are controlled by the action of a cam attached to the ignition operating shaft. Conventional devices that operate by opening and closing have problems because the cam shape was not appropriate.
If the rotation of the ignition operating shaft is stopped for some reason during rotation to ignite or extinguish it, and when you operate it again, if the ignition power supply voltage happens to be low, the raw gas However, this inconvenience has been overcome by appropriately designing the cam shape of the device of the present invention.

In addition, by setting the shape of the cam for operating the switch so that the timing of operation of the power switch for ignition of the sub-burner can be appropriately selected, the conditions that cause the device of the present invention to release newly derived raw gas can be removed. was completed.

[Brief explanation of drawings]

Fig. 1 is an electric circuit diagram for operating the device of the present invention, Fig. 2 is a conceptual diagram of the arrangement of the main components of the device, Fig. 3 is an operation time chart of each main component, and Fig. 4 is the operation of the ignition control shaft knob. The front view of the knob showing the range, and FIGS. 5 to 8 are diagrams depicting a cross section of the device, side sections at two locations, and a side surface, respectively.

Claims (1)

[Claims] 1) This is a type in which an electromagnetic safety valve provided at the gas introduction part to the device is forcibly opened by the electromotive force of a thermocouple facing the sub-burner, and when the sub-burner starts igniting, it is opened by a separate power source. The valve is maintained, and the electromagnetic safety valve, the pilot valve for the sub-burner, and the electromagnetic main valve for the main burner are opened and closed by a cam attached to the ignition operating shaft, wherein the ignition operating shaft is moved from the stop device to the open position. The cam shape is set so that the pilot valve is opened after the safety valve that has been opened is closed again in the process of rotating the gas toward the gas. Control device. 2) The start time of the auxiliary burner igniter is set to a time after the pilot valve opens and before the subsequent opening of the main valve. Gas control device according to item 1.