JPS6144119Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to open combustion type hot air heating, and is intended to provide a hot air heater that is particularly designed to improve its safety performance.

Conventionally, in open combustion hot air heaters, the combustion surface was either opened or protected with simple parts, so in the event of an abnormality such as a blockage of the outlet or a headwind, the influence of the fan, Due to the effects of headwinds and other factors, combustion in the combustion burner became unstable, leading to the generation of CO and, in the worst case scenario, problems such as extinguishing and backfire.

The present invention aims to eliminate such drawbacks of the conventional hot air heater, and examples of the present invention will be shown below.

FIG. 1 shows an embodiment of the hot air heater according to the present invention, and FIG. 2 shows a side sectional view of the device, and FIG. 2 shows a front sectional view thereof.

In Figures 1 and 2, 1 is the appliance body, 2 is a fan, 3 is a blower guide, 4 is a heat shield case, 5 is a warm air outlet, 6 is a combustion tube, and at the bottom is a small hole for supplying secondary air. It has a hole and an exhaust port at the top. 7 indicates a burner, and 8 indicates a nozzle. Also the second
As shown in the figure, a small chamber 9 is provided so as to communicate with the combustion tube 6 and isolate the burner mixing throat section from the ventilation passage, and the other end (nozzle side) is open.
A temperature sensor 10 is installed inside the small chamber 9.
is installed.

In the above configuration, the gas ejected from the nozzle 8 is mixed with air in the burner 7 and combusted.
The flow of air during normal combustion is as shown by the arrows () in Figures 1 and 2. Secondary air flows through the secondary air supply small hole at the bottom of the combustion tube 6 and the nozzle side of the small chamber 9. It is supplied from the open part, flows as shown by the arrow ( ), and is burned in the burner 7 in the combustion tube 6 . The combustion gas generated here becomes a negative pressure inside the combustion chamber 6 due to the air flow (arrow ←) generated by the fan 2, and due to the draft of the combustion gas, it flows to the upper exhaust port of the combustion chamber and is heat shielded. Inside the case 4, the air is mixed with the air sucked in by the fan, and is blown out along the hot air guide 5 as moderately warm air.

Now, next is the combustion chamber (small chamber) 9 and the temperature sensor 1.
Regarding the effect of providing 0, during normal combustion, as mentioned above, secondary air that is not affected by the fan 2 can be continuously supplied from the twisting and firing chamber (small chamber) 9. Therefore, combustion is stabilized and the temperature of the burner 7 body is prevented from rising. Furthermore, if an abnormality occurs such as a backflow of air to the hot air outlet of the appliance or a blockage of the outlet, as shown by the arrows in Figures 1 and 2,
A portion of the hot air enters the combustion tube 6, but since one end 9a of the small chamber 9 is open, the hot air flows back through the secondary air supply small hole 11, and a portion of the hot air flows directly into the small chamber 9. However, if the abnormality is temporary, such as a blockage of the air outlet, the combustion tube 6
Since the internal volume of the burner 7 is designed to be sufficiently large for the combustion amount of the burner 7, the combustion of the burner 7 does not change significantly. Furthermore, if the abnormality is relatively long, the temperature sensor 10 in the combustion chamber (small chamber) 9 detects the abnormal temperature rise due to the backflow of hot air, and shuts off the gas circuit.

Furthermore, when the burner 7 backfires due to other causes, the temperature of the burner mixing throat section increases abnormally, so the temperature sensor 10 detects the temperature increase and similarly shuts off the gas. Becomes a fire safety device.

By having the small chamber 9 and the temperature sensor 10 as described above, it is possible to obtain the effect of further increasing safety in the event of an abnormality.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of an embodiment of the hot air heater according to the present invention, and FIG. 2 is a front sectional view of the hot air heater of FIG. 1... Appliance body, 2... Fan, 3... Air blower guide, 4... Heat shield case, 5... Warm air outlet, 6
... Combustion tube, 7 ... Burner, 8 ... Nozzle, 9 ...
...Small room, 10...Temperature sensor.

Claims (1)

[Scope of utility model registration request] A combustion tube installed in the convection air passage so that the combustion burner is not directly affected by the convection air flow, a small chamber that communicates with the combustion tube and is isolated from the ventilation passage;
A combustion burner with a mixing throat section located in a small chamber and a temperature sensor installed near the throat section are provided, and the exhaust outlet of the combustion tube is connected to a convection air flow, and the inside of the combustion tube is under negative pressure. When the burner backfires or the hot air outlet of the appliance is blocked, hot air in the combustion cylinder is allowed to flow back into the small chamber, thereby activating the temperature sensor to stop combustion. Features an open combustion hot air heater.