JPH0323808B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a gas combustion control device for gas combustion equipment using a proportional valve with a closing function having a sealing portion by a diaphragm.

Conventional configuration and its problems Conventionally, gas control valves installed in the gas passages of gas combustion equipment, which vary the combustion amount by varying the gas pressure using electric signals, open and close the gas passages according to signals from the electric controller. It consists of a solenoid valve that changes the gas pressure to the burner nozzle, and a proportional valve that changes the gas pressure to the burner nozzle. Here, in order to maintain the airtightness of the valve and increase its reliability, two solenoid valves are connected in series, or a dual solenoid valve is used in which two solenoid valves are integrally molded. For this reason, a gas control valve consisting of two electromagnetic valves and a proportional valve has the drawback of being large and expensive. Therefore, a proportional valve with a closing function has been considered, which is a proportional valve equipped with a valve-closing function, and one electromagnetic valve and a proportional valve with a closing function constitute a gas control valve for a combustion device. FIG. 1 shows the configuration of this kind of conventional gas combustion equipment. A proportional valve 3 with a closing function having a sealing portion by a diaphragm is provided in series with a solenoid valve 2 provided on the gas inlet 1 side, and supplies gas to a nozzle 5 of a burner 4. 6 is a solenoid valve 2 and a proportional valve 3 with a closing function.
This is a gas combustion control device that controls the In Figure 2,
The block diagram of the proportional valve with a closing function which has a seal part by a diaphragm is shown. A valve seat 9, which is an elastic member, is provided between the gas inlet 7 and the gas outlet 8, and a valve body 10 is provided opposite the valve seat 9, and is fixed to the valve body 10 and moved in the valve closing direction by gas pressure. A gas governor section composed of a diaphragm 11 that applies force, and a spring 12 that applies a closing force to the valve body 10.
It is composed of a coil 13 which is an electromagnetic force generating section that generates electromagnetic force in response to an electric signal from the gas combustion control device 6, a yoke 14 which is a magnetic material, and a plunger 15.

In this configuration, in the combustion equipment, the solenoid valve 2 is opened by a signal from the gas combustion control device 6 at the time of ignition, and the proportional valve 3 with a closing function is also opened to reach a predetermined gas pressure to supply gas to the nozzle 5. , the igniter (not shown) ignites it, and the burner 4 starts combustion. Thereafter, in response to a signal from the gas combustion control device 6, the proportional valve with a closing function 3 generates an electromagnetic force in the plunger 15 that is proportional to the current value of the coil 13, and transmits it to the valve body 10. Due to this electromagnetic force, secondary pressure is generated in proportion to the force that overcomes the spring 12 according to the governor principle. Therefore, an arbitrary gas pressure can be obtained using an electric signal, and the amount of combustion can be varied. When the combustion equipment is extinguished, the gas combustion control device 6
The solenoid valve 2 and the proportional valve 3 with a closing function close in response to a signal from the valve, thereby maintaining the airtightness of the valve.

Here, when the solenoid valve 2 and the proportional valve with a closing function 3 close at the same time or the proportional valve with a closing function closes first when extinguishing a fire, gas pressure is applied to the diaphragm 11 of the proportional valve with a closing function 3. The valve stays stuck and closes. For this reason, stress due to pressure remains applied to the diaphragm 11 even when the combustion equipment is not in use, which is not preferable for the diaphragm 11 as a sealing member. it is,
In general, nitrile rubber is often used for the diaphragm 11, but it can crack or even break if stressed by ozone in the atmosphere, etc., and from the viewpoint of safety and reliability such as gas leakage, the diaphragm It is not preferable that gas pressure is constantly applied to 11.

Purpose of the invention The present invention solves such conventional problems,
When extinguishing gas-burning equipment, the remaining gas pressure is not applied to the diaphragm of a proportional valve with a closing function that has a diaphragm seal, improving the durability of the diaphragm and ensuring safety against gas leaks due to rupture of the diaphragm, etc. The purpose is to improve sexuality.

Composition of the Invention In order to achieve this object, the present invention provides a solenoid valve provided on the gas inlet side of a gas combustion device, and a proportional valve with a closing function having a gas seal portion formed by a diaphragm provided in series, which closes the valve when extinguishing a fire. In order to shift the timing, a controller is provided that generates a signal to close the proportional valve with a closing function after operating the electromagnetic valve.

With this configuration, when a fire is extinguished, the solenoid valve closes first, gas is no longer supplied to the gas circuit after the solenoid valve, and no pressure is applied. Thereafter, the proportional valve with a closing function performs a closing operation, so that gas pressure is no longer constantly applied to the diaphragm.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. Figure 3 shows the configuration of a heating combustion equipment used indoors, with a solenoid valve 2 on the gas inlet 1 side.
In series there is a proportional valve 3 with a closing function having a sealing part by a diaphragm 11, which supplies gas to the nozzle 5 of the burner 4. 6 is solenoid valve 2
, a proportional valve 3 with a closing function, and a combustion control device that controls a motor fan 7. A heat exchanger 8 is heated by the burner 4, exchanges heat with the air blown by the fan motor 7, and blows out warm air from the air outlet 9. The controller 10 is provided in the gas combustion controller 6, and generates a signal to operate the solenoid valve 2 and then close the proportional valve 3 with a closing function when extinguishing the combustion equipment. Note that the same members as in FIG. 1 are given the same numbers.

In the above configuration, when using combustion equipment,
The operations during ignition and combustion are the same as conventional ones, so their explanation will be omitted. However, when extinguishing combustion equipment, the fourth
As shown in the operation timing diagram of the figure, the controller 10
First, the solenoid valve 2 operates to cut off the gas supply, and after a set delay time has elapsed, the proportional valve 3 with a closing function is closed. Therefore, when the proportional valve 3 with a closing function closes, no pressure is applied to the diaphragm 11 because the gas pressure has definitely decreased. Therefore, when the combustion equipment is not in use, almost no stress is applied to the diaphragm, so stress-induced deterioration such as cracks caused by ozone or the like is not accelerated, and safety is improved.

Effects of the Invention As described above, according to the gas combustion control device of the present invention, when a combustion device is extinguished, the solenoid valve is operated according to a signal from the controller, and then the proportional valve with a closing function is closed, so that the gas pressure Since there is no residual accumulation and no stress is applied to the diaphragm, there is no possibility of damage caused by accelerated deterioration, and even if a proportional valve with a closing function that has a diaphragm seal is used, deterioration caused by stress on the diaphragm is reduced, making it safer. It has the effect of improving sex.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a conventional gas combustion device, FIG. 2 is a configuration diagram of a proportional valve with a closing function, and FIG. 3 is a configuration diagram of a gas combustion device showing an embodiment of the gas combustion control device of the present invention. FIG. 4 is an operation timing diagram of the gas combustion control device according to the present invention. 1... Gas inlet, 2... Solenoid valve, 3... Proportional valve with closing function, 6... Gas combustion control device, 10...
controller.

Claims (1)

[Claims] 1. A solenoid valve provided on the gas passage inlet side, a valve seat in series with the solenoid valve, a valve body facing the valve seat, and a tire flam that is fixed to the valve body and applies a force in the valve closing direction by gas pressure. A gas combustion control device comprising a proportional valve with a closing function, and a controller that generates a signal to close the proportional valve with a closing function after closing the solenoid valve when extinguishing a gas combustion appliance.