JPH01266423A - Hot air heater - Google Patents

Abstract

PURPOSE:To prevent the generation of an offensive odor through complete combustion of unburnt gas remaining in a burner by a method wherein an ignition heater is energized for a specified time starting from the initiation of an extinguishing operation. CONSTITUTION:With an extinguishing switch depressed during the combustion of a heater, an extinguishing operation is started, an oil feed pump 7 is stopped, energization to a vaporizing heater 5 is stopped, and simultaneously energization to an ignition heater 1 is started. At a time t1 after the starting of an extinguishing motion, a solenoid 6 is energized to close a valve 4, and unburnt gas in a vaporizer 3 is prevented from injection from the valve 4. During a time between the starting of an extinguishing motion and a time t2, the ignition heater 1 is energized. During a time between the starting of the extinguishing motion and the time t2, unburnt gas remaining in a burner 2 is completely burnt. At the time t2, energization to the ignition heater 1 is stopped, and at a time t3, the temperature of the vaporizer 3 is lowered enoughly, and the possibility for unburnt gas to be injected therethrough is eliminated. In which case, the energization to the solenoid 6 is stopped and the valve 4 is opened.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to improvements in hot air heaters.

<Prior art> As a method for removing the odor peculiar to hot air heaters when extinguishing a fire, a flame detection circuit determines a preset flame level, closes the fuel injection valve based on the determination result, and then closes the fuel injection valve. By subsequently burning the unburned gas, it was possible to prevent the generation of bad odors.

FIG. 4 shows a time chart of the conventional operating method of this hot air heater. The vaporization heater and oil pump are stopped by starting the fire extinguishing operation. After a few seconds, the blower is suddenly stopped using half-wave control. This is to prevent unburned gas from spewing out to the outside after extinguishing the fire. and,
The current flame resistance value (flame level) is detected by the flame detection device, and when the flame resistance value exceeds the set value, the fuel injection valve is closed and the fuel gas remaining inside the carburetor is ejected. prevent. After that, the blower is activated for a certain period of time, and this air blowing prevents the temperature from rising due to residual heat inside the warm air heater. When the temperature of the vaporizer decreases, unburned gas will no longer be ejected from the ejection valve, so open the ejection valve after a few minutes.

<Problems to be Solved by the Invention> The above method has a considerable effect of eliminating bad odors, but when the flame in the burner is completely extinguished, a small amount of unburned gas remaining in the burner generates a bad odor. There was a drawback.

The present invention has been made in view of the above circumstances, and its purpose is to provide a hot air heater that eliminates the generation of unburned gas in the burner.

Means for Solving the Problems> In order to achieve the above object, the hot air heater according to the present invention has an ignition heater for igniting the fuel gas ejected into the burner for a certain period of time after the start of the extinguishing operation. An energizing means for energizing is provided.

<Function> In the hot air heater according to the present invention, the unburned gas remaining in the burner is completely combusted by energizing the ignition heater for a certain period of time after the start of the extinguishing operation.

<Example> FIG. 1 shows the configuration of a hot air heater of this example. In the figure, 1 is an ignition heater, 2 is a burner, 3 is a vaporizer, 4 is a valve, 5 is a vaporization heater, 6 is a solenoid, 7 is an oil feed pump, and 8 is a microcomputer.

The ignition heater 1 ignites the fuel gas supplied to the burner 2 . This ignition heater is made of ceramic or the like, and is heated by electricity.

Burner 2 burns fuel gas. The vaporizer 3 vaporizes petroleum fuel (for example, kerosene). The valve 4 injects the fuel vaporized in the carburetor 3 toward the burner 2 . The vaporization heater 5 supplies heat to the vaporizer 3 to vaporize the fuel. The solenoid 6 opens and closes the valve 4. The oil feed pump 7 feeds petroleum fuel to the vaporizer 3. The microcomputer 8 controls the operation of each of the above-mentioned devices.

FIG. 2 shows an operating time chart of this warm air heater, and FIG. 3 shows its operating procedure. Below, this figure 2 and 3
The operation of this warm air heater will be explained according to the diagram.

When the fire extinguishing switch is pressed while the hot air heater is burning, a fire extinguishing operation is started. First, the oil feed pump 7 is stopped, and the supply of fuel is stopped. Further, the supply of electricity to the vaporization heater 5 is stopped, and the temperature of the vaporizer 3 decreases.

On the other hand, at the same time as this extinguishing operation is started, the ignition heater 1 is energized, and this energization is continued for a certain period of time. This energization heats the ignition heater 1 to a high temperature.

At time t1 after the start of the fire extinguishing operation, the solenoid 6 is energized and the valve 4 is closed to prevent unburned gas in the carburetor 3 from spewing out from the valve 4. The time from the start of the extinguishing operation to time [2] is the time required to burn off the unburned gas. From the start of this extinguishing operation until time t2,
The ignition heater 1 is energized.

The unburned gas remaining in the burner 2 is completely combusted between the start of the extinguishing operation and the time L2. Then, at time t2, the energization to the ignition heater 1 is stopped. Also, vaporizer 3
At time t3, the temperature gradually decreases by stopping the power supply to the vaporization heater 5, and at time t3, there is no fear that unburned gas will blow out from the vaporizer 3. Therefore, solenoid 6
The energization is stopped and the valve 4 is opened. This time L3
When the valve 4 is opened, the extinguishing operation is completed.

The microcomputer 8 measures the above-mentioned times El, t2, and 13.

<Effects of the Invention> As explained above, in the present invention, since the ignition heater is energized for a certain period of time after the start of the extinguishing operation, the unburned gas remaining in the burner can be completely combusted.
Therefore, it is possible to prevent the occurrence of a bad odor when the warm air heater is extinguished.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the configuration of the embodiment of the present invention, Fig. 2 is an operation timing chart of the embodiment of the invention, Fig. 3 is a flowchart of the embodiment of the invention, and Fig. 4 is an operation timing chart of the conventional example. . 1... Ignition heater 2... Burner 3... Vaporizer 4... Valve 5... Vaporization heater 6... Solenoid 7... Oil feed pump 8... Microcomputer patent applicant Sharp Co., Ltd. Agent Patent Attorney Nishi 1) Newly built 1st drawing/shi/ban 6no Logo Uni 222=ko 3rd ↓ End 4th

Claims (1)

[Claims] The fuel is vaporized by a vaporization heater and ejected into the burner,
A hot air heater that generates hot air by igniting the hot air heater using an ignition heater, the hot air heater comprising an energizing means that energizes the ignition heater for a certain period of time after the start of extinguishing operation.