JPH0539921A - Combustion safety device - Google Patents

Abstract

(57) [Summary] [Purpose] Detect high-temperature flames or exhaust gas leaks due to equipment damage in the initial state, and prevent serious accidents such as fires from occurring. [Configuration] A detection value of a temperature or humidity detection means 14 provided in a space where combustion air does not flow inside a combustion device exceeds a set value, or insulation stretched around a protection case surrounding the heat exchanger 3. The disconnection of the electric wire 17 or the change of the resistance value is detected by the control means 16 and 18, and an abnormality is displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion safety device for a combustion apparatus such as a water heater, which prevents an accident caused by a combustion flame overheating an outer plate.

[0002]

2. Description of the Related Art FIG. 5 shows a water heater 1 as a conventional combustion device.
FIG. 6 is a side view showing a mounting state in which the water heater 1 is mounted on the wall 2 of the house. 5 and 6, 3 is a heat exchanger arranged above the burner 4, 5 is an exhaust pipe penetratingly supported on the upper surface of the outer plate 6 of the water heater 1, and 7 is coaxially arranged outside the exhaust pipe 5. A supply cylinder, 8 is a motor for driving a fan 9 that guides the supply air from the supply cylinder 7 to the burner 4,
Reference numeral 10 is a water amount sensor provided at the water inlet of the heat exchanger 3, 11 is a water inlet temperature sensor provided at the water inlet, 12 is a hot water outlet temperature sensor provided at the hot water outlet of the heat exchanger 3, and 13 is surrounding the heat exchanger 3. It is a protective case (so-called hama).

Next, the operation will be described. The burner 4 is burned, and the air supplied from the cylinder 7 is guided to the burner 4 by a fan 9 driven by a motor 8. And
The water introduced from the water supply port is heated to a predetermined temperature while passing through the heat exchanger 3 and reaching the hot water outlet. In this case, the combustion amount of the burner 3, the rotation amount of the motor 8 and the like are controlled based on the outputs of the water amount sensor 10, the incoming water temperature sensor 11 and the hot water temperature sensor 12.

[0004]

Since the conventional water heater is constructed as described above, it is heated by the high temperature flame or exhaust gas leaking from the damaged portion of the protective case 13 damaged by corrosion or the like, There is a problem in that the plate 6 is oxidized and damaged, and the wall 2 of the house is heated from this damaged part to cause a fire hazard.

The present invention has been made to solve the above conventional problems, and an object thereof is to prevent a fire from occurring.

[0006]

According to a first aspect of the present invention, there is provided a combustion safety device including a temperature or humidity detecting means provided in a space in which combustion air does not flow inside a combustion device, and the temperature or humidity detecting means. And a control means for detecting that the detected value exceeds a preset set value and displaying an abnormality.

According to a second aspect of the present invention, there is provided a combustion safety device in which an insulated electric wire stretched around an outer periphery of a protective case surrounding a heat exchange section inside a combustion device and a cut of the insulated electric wire or a change in resistance value of the insulated electric wire. A control means for detecting and displaying an abnormality is provided.

[0008]

The control means in the first aspect of the invention detects that the detection value of the temperature or humidity detection means provided in the space where the combustion air does not flow inside the water heater exceeds the preset value. By displaying an anomaly on the display, it is safe to detect damage to the combustion equipment at an early stage, stop combustion, and notify the damage.

The control means in the invention according to claim 2 is
By cutting the insulated wire stretched around the outer periphery of the protective case surrounding the heat exchanger or detecting a change in the resistance value of the insulated wire and displaying the abnormality, the same effect as that of the invention of claim 1 can be obtained.

[0010]

Embodiments of the present invention will now be described with reference to the drawings. 1 and 2 show a water heater 1 as a combustion device according to a first embodiment of the present invention. The same parts as those of the conventional water heater shown in FIGS. Is omitted. In FIG. 1 and FIG. 2, 14 is a temperature or humidity detecting means provided in a space where the combustion air 15 does not flow inside the water heater, and 16 is a detected value of the temperature or humidity detecting means 14 exceeds a preset value. It is a control means for detecting that, for example, blinking a lamp and operating a buzzer to display an abnormality.

Next, the operation of the first embodiment will be described. The hot water discharge operation by operating the burner 3 and the fan 9 is the same as that of the conventional apparatus shown in FIGS. During the tapping operation, when the protective case 13 surrounding the heat exchanger 3 is damaged due to corrosion or the like and a flame projects from the damaged part, the temperature rise due to the flame or the humidity rise due to the moisture in the exhaust gas is detected as a temperature or humidity detecting means. Detect at 14. Therefore, the control means 16 detects that the detected value of the temperature or humidity detecting means 14 exceeds a preset set value and displays an abnormality. Therefore, since the abnormality is detected and displayed at the early stage of damage to the protective case 13, it is possible to prevent a serious accident such as a fire from occurring.

FIGS. 3 and 4 show a water heater 1 according to a second embodiment of the present invention. The same parts as those in the first embodiment are designated by the same reference numerals and their duplicate description will be omitted. In FIGS. 3 and 4, 17 is a small-diameter insulated wire stretched around the outer circumference of the protective case 13, and 18 is a control means for detecting disconnection of the insulated wire 18 or resistance value change.

The hot water discharge operation is the same as in the case of the first embodiment. During this tapping operation, the protective case 13 is damaged, and the insulated wire 17 is cut by the high temperature flame or exhaust gas leaked from the damaged portion, or the insulated wire 1
When the resistance value of No. 7 has changed, the disconnection or the change of the resistance value is detected by the control means 18 and the occurrence of abnormality is displayed. Therefore,
The same effect as the first embodiment can be obtained.

[0014]

As described above, according to the first aspect of the invention, since the abnormality is displayed when the temperature or humidity inside the device exceeds the set value, when the outer plate of the device is damaged. , The abnormality can be known at the early stage of the damage, and a serious accident such as a fire can be prevented. Also,
When the device of the present invention is installed indoors, it is possible to prevent the exhaust gas from being filled indoors and leading to an oxygen deficiency accident.

According to the second aspect of the invention, the abnormality is detected by cutting the insulated wire stretched around the outer periphery of the protective case surrounding the heat exchanger or by changing the resistance value. In addition to the same effect as that of the invention described above, there is an effect that a fail safe can be configured by connecting the insulated wire in series with the fuel valve coil.

[Brief description of drawings]

FIG. 1 is a front view of a water heater according to a first embodiment of the present invention.

FIG. 2 is a side view of the first embodiment.

FIG. 3 is a front view of a water heater according to a second embodiment of the present invention.

FIG. 4 is a side view of the second embodiment.

FIG. 5 is a front view of a conventional water heater.

FIG. 6 is a side view showing a conventional water heater attached to a wall of a house.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water heater 3 Heat exchanger 14 Temperature or humidity detection means 16 Control means 17 Insulated electric wire 18 Control means

Claims (2)

[Claims] 1. A temperature or humidity detecting means provided in a space where combustion air does not flow inside a combustion device, and an abnormality is detected by detecting that a detected value of the temperature or humidity detecting means exceeds a preset value. A combustion safety device having a control means for displaying. 2. An insulated electric wire stretched around an outer periphery of a protective case surrounding a heat exchanger inside a combustion device, and a control means for displaying an abnormality by cutting the insulated electric wire or detecting a resistance value change of the insulated electric wire. Combustion safety device equipped.