JPH0213880Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a safety device in a forced air combustion type combustion apparatus.

Conventionally, in this type of combustion equipment, such as a water heater, a temperature-sensitive sensor to prevent overheating is placed around the heat exchanger to prevent combustion gas from flowing from the connection between the heat exchanger and the exhaust stack. There is a known device that detects the temperature rise in the vicinity when there is a leak. In this system, multiple temperature sensors must be installed at the connection points between the heat exchanger and air distribution chamber, which are the combustion chambers, the heat exchanger and the exhaust stack, and at these high temperature parts. It has the drawback that the settings and wiring are complicated, and if the wall of the heat exchanger is sometimes torn due to thermal distortion, combustion gas is sucked into the combustion air supply fan, so the temperature sensor cannot detect the temperature. However, there were drawbacks such as the risk of fire, etc.

The purpose of this project is to obtain a highly safe combustion device that eliminates these inconveniences, and includes a temperature detection element that detects combustion gas leakage from the combustion device near the suction port of the forced air supply fan. It is characterized by what it did.

To explain the present invention in detail with reference to drawings and an example of a water heater, reference numeral 1 is a forced combustion air supply type combustion device main body, and inside the casing, a combustion air supply fan 2 is installed at the bottom or side of the main body. It is located in 3 is an air intake opening of the fan 2. Reference numeral 4 denotes an air distribution chamber in which the air pumped by the fan is distributed to the heating source 5. 6 is the manifold,
For liquid fuels, it may be a vaporizer. The air distribution chamber 4 has a heating source 5, a distribution plate 7, etc. disposed therein to form a substantially rectangular housing shape, and has a flange 8 at its upper opening. A heat exchanger 9 has a water pipe 10 wound around its outer periphery. Reference numeral 11 denotes fins, through which the water pipe 10 is passed through the fins. The inside of the heat exchanger 9 serves as a combustion chamber, which is a cavity, and has fins 11 connected above. The upper opening of the heat exchanger 9 forms a flange 8 . 12 is a packing material to prevent exhaust leakage. Reference numeral 13 denotes an exhaust pipe for discharging combustion gas to the outside of the main body 1 of the apparatus. Reference numeral 14 denotes an air intake port which forms an air flow flowing around the exhaust pipe 13 and the heat exchanger 9. Reference numeral 15 denotes a dividing plate, on one side of which electrical components 16 and a control section 17 are attached, and on the other side partitioned to form and guide airflow. Reference numeral 18 denotes a temperature detection element, and for example, a bimetallic switch or a thermistor is used as the element for detecting temperature.

To explain this operation here, since the pressure inside the heat exchanger is generally high due to the forced combustion air being supplied by the fan 2 and the pressure of combustion gas from the heating source 5, the flange surface 8 , 8, if a seal leak occurs, the combustion high temperature gas is transferred to fan 2.
At the same time, the intake port 3 of the fan 2
A temperature sensing element is placed nearby to detect the leakage of this high temperature gas and close the circuit of a fuel supply safety valve (not shown). Furthermore, the outer peripheral wall of the heat exchanger 9 was damaged due to fatigue due to thermal contraction, and combustion gas leaked, resulting in overheating of the body and electrical components 1.
6. Although the control part 17 etc. may be damaged, in this application, the suction force of the combustion air supply fan 2 can suck the combustion air flow from the upper opening 14 together with the hot air of this combustion gas leakage. Temperature detection element 1 in the part where the suction air flows
8, especially if it is installed near the top of the intake port 3 of the fan 2, it will prevent seal leakage on the flange 8 surface, seal leakage due to thermal distortion, and leakage due to damage to the heat exchanger 9. Detection is possible with certainty.

As described above, according to the present invention, the combustion gas leakage generated from the combustion device inside the main body 1 is detected by the temperature detection element provided near the intake port 3 of the combustion air supply fan 2. I can do it. In addition to eliminating the above-mentioned disadvantages, the present invention has advantages such as preventing damage to the instrument main body 1 due to combustion exhaust gas, achieving high safety and reliability, and having a simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of an embodiment of the present application. 1...Body, 2...Fan, 3...Intake port, 4
... Air distribution chamber, 5 ... Heat source, 6 ... Manifold, 7 ... Distribution plate, 8 ... Flange, 9 ... Heat exchanger, 10 ... Water pipe, 11 ... Fin, 12 ...
...Packing, 13...Exhaust pipe, 14...Opening,
15...Bunching plate, 16...Electrical component, 17...Control unit, 18...Temperature detection element.

Claims (1)

[Scope of utility model registration request] In a forced air combustion device, combustion air is supplied to a heating source by a forced air fan, and the air distribution chamber housing the heating source communicates with a heat exchanger and an exhaust stack. A safety device for a combustion device, characterized in that the device is housed and covered in a main body housing, and a temperature detection element for detecting combustion gas leakage from the combustion device is disposed near the intake port of the forced air supply fan.