JPH11173548A - Combustion apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combustion apparatus to stop abnormal combustion before leakage of exhaust gas occurs and flame failure and abnormal over heating occur and improve safety through detection of gas leakage, in the com bustion apparatus to burn a gas fuel through forced supply of combustion air. SOLUTION: Combustion air is forcibly introduced in a combustion part 3 arranged in a casing 1 by a fan 6 and after the combustion air is mixed with fuel gas and a mixture is burnt, combustion gas is fed in a heat-exchanger 4, and the combustion gas is discharged from an exhaust chamber 5 to an external part. In a so formed combustion apparatus, an O2 sensor 9 is arranged in the vicinity of an intake port 10 of the discharge port of the fan 6 to supply combustion air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus for forcibly supplying combustion air to burn gaseous fuel.
The present invention relates to a combustion apparatus with improved safety.

[0002]

2. Description of the Related Art Conventionally, as a burning appliance used for a water heater or a bathtub with a hot water supply, a combustion chamber, a heat exchanger, an exhaust chamber, a fan, a substrate, and the like are installed inside an exterior, and fuel gas and combustion air are used. Is supplied to the combustion chamber by a fan, burned by a burner in the combustion chamber, sent to the heat exchanger, and then discharged to the outside from the exhaust chamber. As a device to detect, a frame rod,
Thermal fuses, thermistors, bimetals, etc. are used.

[0003]

As described above, a flame rod, a temperature fuse, a thermistor, a bimetal, and the like are used as a device for detecting abnormal combustion in a burning appliance. Detecting the disappearance, the temperature fuse, thermistor, bimetal, etc. detect the empty burning. Further, the thermal fuse detects a leak of a flame due to damage to the combustion chamber and the heat exchanger.

[0004] In view of this, when exhaust gas leaks, even if the combustion is abnormal, there is a problem that the combustion is continued unless the burn-out or abnormal overheating occurs as a result.

[0005] Further, since there is no gas leak detection function in the main body of the combustion equipment, the reliability of the parts serving as gas passages is improved, so that only gas leakage is prevented beforehand, and gas leakage in the combustion equipment cannot be detected. In the event that gas leaks to the outside, it is necessary to rely on a commercially available gas leak alarm.

[0006] The present invention has been made in view of such circumstances, and by providing a gas leak detection function in a combustion appliance, when an exhaust leak or a gas leak occurs, it is possible to prevent the extinguishing or abnormal overheating from occurring. It is an object of the present invention to provide a highly safe combustion appliance that can stop abnormal combustion.

[0007]

According to the present invention, as shown in FIG. 1, the combustion air is forcibly forced by a fan 6 into a combustion section 3 installed in an exterior 1 as shown in FIG. After being introduced, mixed with fuel gas and burned, heat exchanger 4
And a combustion device for discharging combustion gas from the exhaust chamber 5 to the outside, the intake port 1 of a fan 6 for supplying combustion air.
It is characterized in that the O ₂ sensor 9 is installed at 0 or near the discharge port.

Here, the vicinity of the intake port 10 or the discharge port of the fan 6 is a position on the flow path of the air passing through the fan 6, and the number of the O ₂ sensors 9 is not limited.

[0009] As is apparent from the above configuration, when exhaust gas leakage occurs due to the combustion equipment, compared with normal operation, O
₍₂ ) Low-concentration air passes through the intake port 10 of the fan 6.

The air having a low O ₂ concentration is detected by the O ₂ sensor 9 installed near the fan intake port, and abnormal combustion can be stopped.

Further, in the case where a gas leak occurs, similarly, air having a low O ₂ concentration will pass through the fan inlet, and if the gas leak is effectively detected, combustion is stopped, and the safety valve is closed, good.

As described above, the O ₂ sensor 9 can effectively detect an exhaust leak or a gas leak, and can stop abnormal combustion before it goes out or abnormal overheating occurs.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a combustion apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an explanatory view showing the configuration of a combustion appliance according to the present invention, and FIGS. 2 and 3 are explanatory diagrams showing the arrangement of an O ₂ sensor 9 installed in the combustion appliance according to the present invention.

In FIG. 1, the combustion apparatus has a combustion unit 3, a heat exchanger 4, and an exhaust chamber 5 arranged in order from a lower side to an upper side in an exterior 1 and a front cover 2 so that air is taken in from the outside. A fan 6, a board 7 for performing various controls, and other electrical components 8 are installed in the exterior 1.

By the way, the combustion apparatus according to the present invention is characterized in that the O ₂ sensor 9 is installed in the vicinity of the intake port or the discharge port of the fan 6 so as to accurately detect the exhaust leak and the gas leak. is there.

That is, during normal combustion, the air that has entered the exterior 1 through the intake port 10 reaches the fan 6 via the O ₂ sensor 9 along the intake passage 11, and the O ₂ concentration at this time is outside air. Is the same as Therefore, if exhaust leakage occurs,
Since the exhaust gas enters through the exhaust leakage flow path indicated by the arrow 13, the O ₂ concentration detected by the O ₂ sensor 9 becomes lower than that of the outside air. As a result, the O ₂ sensor 9 can quickly detect the exhaust leakage. Can be.

Similarly, when gas leakage occurs, gas is mixed along the gas leakage flow path indicated by reference numeral 14 and O ₂
Since gas is mixed along the sensor 9, the O ₂ concentration detected by the O ₂ sensor 9 becomes lower than that of the outside air, and as a result, gas leakage can be detected quickly.

In FIG. 1, reference numeral 12 denotes an exhaust passage,
Reference numeral 16 indicates a gas inlet, reference numeral 17 indicates a gas leak portion (assumed), and reference numeral 18 indicates an exhaust leak portion (assumed).

As described above, since the O ₂ sensor 9 is installed near the intake port or the discharge port of the fan 6, it is possible to quickly detect an exhaust leak or a gas leak, and to stop abnormal combustion before it goes out or overheats abnormally. It is possible to immediately stop abnormal combustion of the burning appliance without relying on a commercially available gas leak alarm.

It is desirable that the O ₂ sensor 9 is disposed near the center of the intake passage of the fan 6 so as to accurately detect the O ₂ concentration in the intake air, but the installation location is not limited to this. , for example, as shown in FIG. 2, it may be mounted on the discharge side of the fan 6 through the O ₂ sensor support member 15, and as shown in FIG. 3, O ₂ on the suction side of the fan 6
You may make it attach via the sensor support member 15.

[0022]

As described in the foregoing, the combustion device according to the present invention, since the vicinity of an intake port or discharge port of the fan supplying the combustion air is a configuration that installing the O ₂ sensor, this O ₂ sensor It can quickly detect the passage of air with low O ₂ concentration, quickly detect exhaust leaks and gas leaks, and if exhaust leaks occur, stop abnormal combustion before going out or overheating abnormally. Leakage can also be detected, and there is an effect that high safety can be obtained without relying on a commercially available gas leak alarm.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory view showing one embodiment of a combustion appliance according to the present invention.

FIG. 2 is an explanatory view showing a modified example of an arrangement structure of an O ₂ sensor installed in a combustion apparatus according to the present invention.

FIG. 3 is an explanatory view showing a modification of the arrangement structure of the O ₂ sensor installed in the combustion apparatus according to the present invention.

[Explanation of symbols]

1 exterior 2 front cover 3 combustion section 4 heat exchanger 5 exhaust chamber 6 fan 7 substrate 8 electrical components 9 O ₂ sensor 10 intake opening 11 inlet passage 12 exhaust passage 13 exhaust leakage channel (assuming) 14 gas leakage flow passage (Assumption) 15 O ₂ sensor support member 16 Gas inlet 17 Gas leakage part (Assumption) 18 Exhaust leakage part (Assumption)

Continuing on the front page (72) Inventor, Hisahiro Kobayashi 1250, Shimoe-ren, Shimodate-shi, Ibaraki Pref.Hitachi Kasei Kogyo Co., Ltd. (72) Inventor Hiroshi Shinozaki 1250 Shimoedori, Shimodate-shi, Ibaraki Pref.Hitachi Chemical Industry Co., Ltd.

Claims (1)

[Claims] 1. A combustion air is forcibly introduced by a fan into a combustion section installed in an exterior, mixed with fuel gas and burned, and then sent to a heat exchanger, and the combustion gas is discharged from an exhaust chamber. What is claimed is: 1. A combustion appliance for discharging to the outside, wherein an O ₂ sensor is provided near a fan intake port or a discharge port for supplying combustion air.