JPS5821173B2 - Anzensou chitsuki gas nenshiyoukiki - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a gas combustion appliance with a safety device that can prevent carbon monoxide poisoning and explosion accidents caused by malfunctioning incomplete combustion appliances due to lack of oxygen.

In household gas appliances.

Despite the efforts of gas manufacturers, explosion accidents due to propane gas leaks and poisoning accidents due to city gas are on the rise. It is promoting the development of

If the fire safety device extinguishes the fire due to wind, pressure drop, supply interruption, etc., the safety device activates and closes the safety valve to prevent raw gas from leaking.This device prevents explosions caused by propane. Can be done.

However, in recent years, building structures have become more airtight, and on the other hand, as the capacity of gas appliances has increased, the oxygen necessary for combustion cannot be supplied sufficiently, and carbon monoxide is generated due to incomplete combustion.
Poisoning accidents are rapidly increasing.

To prevent this poisoning accident, an oxygen deficiency safety device is required.

As an oxygen deficiency safety device, a method has been developed to detect oxygen deficiency by flame lift-up.

That is, when there is a lack of oxygen, combustion occurs at a point where the flame becomes elongated and more elongated than a normal combustion flame and rises above the tip of the burner nozzle.

Therefore, if a thermocouple is installed at the tip of the burner, when the burner is lifted up, the electromotive force will be lower than in the normal state, thereby detecting oxygen deficiency.

This method has a simple structure, a clear detection principle, and is economical in cost, and has already been put into practical use in Europe.

However, in our country, there are 14 to 15 types of gas, and the lift-up methods are different.

In addition, half of the total gas in Japan is city gas, and city gas has a fatal flaw in that it has a high content of hydrogen, carbon monoxide, etc., making lift-up difficult.

Furthermore, even if there is sufficient oxygen and the pilot flame is completely combusted, an abnormality in the main burner equipment may cause incomplete combustion and carbon monoxide may be generated but cannot be detected.

Therefore, 1. It can be applied to city gas, propane, and natural gas, and 11. Carbon monoxide poisoning due to incomplete combustion due to oxygen deficiency can be prevented.

111 We are looking forward to the publication of combustion equipment with a safety device that can prevent abnormal combustion caused by equipment malfunctions - carbon oxide.

The present invention prevents incomplete combustion caused by lack of oxygen and abnormalities caused by poor maintenance of appliances by directly monitoring the flame safety device and combustion flame of bathtubs, instantaneous water heaters, gas stoves, gas ovens, etc. The present invention provides a gas combustion device with a safety device that can automatically close a safety valve when carbon monoxide is generated due to combustion to a degree that poses a danger to the human body.

The essential components of the gas combustion device of the present invention include a sensor that generates an electromotive force due to carbon monoxide present in the atmosphere near the combustion flame, and a safety valve that serves as an actuator to shut off gas.

The safety valve then works in conjunction with the signal from the spark safety device.

A block diagram of the gas combustion equipment of the present invention is shown in FIG.

In FIG. 1, 1 is a carbon monoxide detection sensor.

2 is a main burner, 3 is a pilot spark plug, 4 is a primary air intake port, 5 is a pilot monitor sensor in which a thermocouple is enclosed, and 6 and 1 are a safety valve and an appliance governor provided in a gas path 8, respectively.

Figure 2 shows the main parts of the gas combustion equipment of the present invention.
As shown in the figure, the carbon monoxide detection sensor consists of a cylindrical solid electrolyte 9 with one end closed, and platinum porous electrodes 10 and 11 provided on the outer and inner surfaces of the solid electrolyte 9 to form a type of oxygen concentration battery. There is.

Reference numeral 12 denotes a horseshoe-shaped core constituting a safety valve, and reference numeral 13 denotes a movable iron piece movably supported on the four parts of the gas passage 8. When the movable iron piece 13 moves upward, the movable iron piece 1 of the gas passage 8
3.

14 and 15 are windings respectively wound around the horseshoe-shaped core 12, the winding 14 is connected to the thermocouple 161C, and the winding 15 is connected to the carbon oxide detection sensor 1.

In FIG. 2, A indicates the magnetic flux generated by the winding 14 caused by the electromotive force generated by the thermocouple IS, and B indicates the electromotive force generated by the carbon monoxide detection sensor 1, which causes the current to flow through the winding 14. A current flows through the wire 15, indicating the magnetic flux generated by this winding 15.

FIGS. 3 and 4 show the electromotive force with respect to the oxygen concentration and carbon oxide concentration of the carbon oxide detection sensor 1, respectively.

When the main burner 2 is ignited by the pilot spark plug 3, the pilot spark monitoring sensor 5 is heated, and the thermocouple 16 enclosed within the pilot spark monitoring sensor 5 is heated to generate an electromotive force.

This electromotive force keeps the safety pulp 6 open and the supply of gas to the main burner 2 continues.

While the oxygen concentration in the primary air is maintained at a normal state of 20% or higher, no electromotive force is generated in the carbon monoxide detection sensor 1.

However, if the oxygen concentration in the primary air drops below 18%, or due to abnormal combustion, 100p,
When carbon monoxide of p, m or more is contained, an electromotive force starts to be generated in the carbon monoxide detection sensor 1 and reaches a maximum of 800 mV.
An electromotive force is generated.

This Ω electromotive force causes a current to flow through the winding 15 due to the electromotive force of the thermocouple 16, generating a magnetic field in the opposite direction to that of the winding 14 which is held open, thereby closing the safety valve 6.

In this case, the electromotive force of the thermocouple and the carbon monoxide detection sensor 1
It operates using only the electromotive force, so no external power source is required.

The above functions prevent carbon monoxide poisoning accidents.

The main burner 2 will operate normally if the room is sufficiently ventilated and the fire is relit.

Furthermore, if the pilot flame goes out for some reason, the pilot flame monitoring sensor 5 is activated and the safety valve 6 is closed.

As described above, the gas combustion equipment of the present invention is equipped with a spark monitoring device and is capable of detecting carbon monoxide generated from any cause and automatically closing a safety valve.

1 Type of gas (city gas - propane gas, natural gas)
works regardless.

11 The safety valve can be activated and automatically close when the oxygen concentration in the primary air drops to 18% or less.

111 Even if the oxygen concentration in the primary air is normal, it will activate if incomplete combustion occurs and carbon monoxide is generated due to equipment failure or poor maintenance.

1v Carbon monoxide detection sensor near the flame 500-80
Fast response speed for directly detecting carbon monoxide in 0°C exhaust gas.

■ Only by adding a carbon monoxide detection sensor, the safety valve is operated by the carbon monoxide detection sensor and spark monitoring sensor, and these sensors do not require an external power source, so the cost is very low.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a gas combustion equipment with a safety device of the present invention, Fig. 2 is an electrical circuit diagram of the same main part, and Figs. 3 and 4 respectively show a carbon monoxide detection sensor used in the gas combustion equipment of the invention. FIG. 3 is a diagram showing the relationship between electromotive force and oxygen concentration and carbon monoxide concentration. 1... Carbon monoxide detection sensor, 2...
Burner, 3...Old spark plug, 4...Primary air intake, 5...Top fire monitoring sensor, 6...
・・Safety valve, 7・・Garment governor, 8・・・・
Gas path, 9...Solid electrolyte, 10°11...
... Platinum porous electrode, 12 ... Horseshoe-shaped core,
13...-Movable iron piece, 14, 15... Winding wire, 16... Thermocouple.

Claims (1)

[Claims] 1. A carbon monoxide detection sensor placed in the atmosphere near the combustion flame of the burner, a spark monitoring sensor equipped with a thermocouple,
A safety valve is provided in the fuel supply path to the burner, and the Joetsu safety valve has a first winding directly connected to the carbon oxide detection sensor and a second winding directly connected to the thermocouple. , the electromotive force of the thermocouple is applied to the second winding, and is released by the magnetic flux generated, and the -
A gas combustion device with a safety device configured to be closed by canceling the magnetic flux generated in the first winding by applying the electromotive force of the carbon oxide detection sensor to the first winding.