JPS6017624Y2 - Water heater - Google Patents

Description

[Detailed description of the invention] This invention consists of an upper water heat exchanger having a large number of heat transfer fins on the outer periphery and a lower heating burner opposing the upper water heat exchanger in a frame cylinder having an exhaust port on the upper surface. This invention relates to a housed type water heater.

Originally, in this type of water heater, when used for a long time, combustion products, dirt, etc. accumulate especially around the outer periphery of the water heat exchanger, which obstructs ventilation, and this causes poor combustion in the burner below it. It's a win.

The purpose of the present invention is to provide a water heater that can detect such combustion defects at an early stage. A pilot burner 3 is housed in an airtight frame cylinder 5 having an exhaust port 4 on the upper surface, and a pilot burner 6 and a pilot burner 6 are located on one side of the burner 3 in the frame cylinder 5. It is provided with a thermocouple 8 for a safety device 7 heated by a flame, and has a downward air supply passage 10 located on the other side of the burner 3 and connected to outside air via an air supply port 9.

The water heat exchanger 2 has a jacket 11 on its outer periphery, and is connected to the outside through a pair of circulation pipes 12, 12 in the jacket 11.

Gas cock 1 operated by heating burner 3 knob 13
The safety device 7 described above is installed in the lower part of the gas cock 14 and is connected to an external gas conduit 15 via a thermocouple 8.
The valve is maintained in the open position by the electromotive force.

In the drawings, reference numeral 16 indicates an ignition electrode linked to the cock 14.

The air supply port 9 opens at a relatively upper position, and the exhaust passage 10 extends downward inside thereof. In the drawing, reference numeral 17 indicates a partition wall forming the passage 10.

To explain its operation, during combustion in the heating burner 3, the combustion air is guided downward from the air supply port 9 into the air supply passage 10, and then rises together with the combustion flame of the burner 3, After being heated, it is led to the outside from the exhaust port 4 above it, but if the heat transfer fins 1 on the outer periphery of the exchanger 2 become clogged, the flow of exhaust gas is obstructed and the back pressure increases in the burner 3. As a result, the intake capacity through the air supply port 9 is reduced.

According to this, as the intake capacity of the supply air flowing in due to the convection of the combustion flame of the burner 3 decreases, the amount of air supplied to the pilot burner 6 located on the opposite side becomes insufficient, resulting in oxygen deficiency. As a result, the thermocouple 8 is not sufficiently heated, the safety device 7 is closed, and the burner 3 is extinguished.

This is repeated by re-ignition, and thus the aforementioned clogging can be detected.

In this way, according to the present invention, a pilot burner 6 and a thermocouple 8 for a safety device 7 heated by the flame of the pilot burner 6 are provided in an airtight frame cylinder 5 and located on one side of the burner 3. At the same time, since the downward air supply passage 10 located on the other side of the burner 3 and connected to the outside air via the air supply port 9 is opened, the heat transfer fins of the heat exchanger 2 provided in the frame tube 5 are opened. 1 is clogged, and the exhaust from the exhaust port 4 on the top surface is limited, and the supply air from the air supply port 9 becomes insufficient.The pilot burner 6 becomes short of oxygen first, and as a result, the pilot burner immediately The flame 6 causes a lift phenomenon, causing insufficient heating of the thermocouple 8, activating the safety device 7, and immediately counteracting the clogging of the heat transfer fin 1.
Since this process is repeated due to re-ignition, it is effective in preventing the danger of continued poor combustion due to clogging.

[Brief explanation of the drawing]

The drawing is a cut side view of one example of the device of the present invention. 1...Heat transfer fin, 2...Water heat exchanger, 3...Heating burner, 4...Exhaust port, 5...・Frame cylinder, 6... Pilot burner, 7
... Safety device, 8 ... Thermocouple, 9 ...
...Air supply port, 10...Air supply passage.

Claims (1)

[Scope of utility model registration request] An upper water heat exchanger 2 having a plurality of heat transfer fins 1 on the outer periphery and a heating burner 3 facing the upper water heat exchanger 2 are housed in an airtight frame housing 5 having an exhaust port 4 on the upper surface. A pilot burner 6 located on one side of the burner 3 and a thermocouple 8 for a safety device 7 heated by the flame of the pilot burner 6 are provided in the frame tube 5 and located on the other side of the burner 3. The water heater is heated by opening a downward air supply passage 1cI connected to outside air via an air supply port 9.