JPH0842845A - Combustor - Google Patents

Abstract

PURPOSE:To provide an economical combustor capable of reducing power consumption and of stable combustion. CONSTITUTION:In a combustor 1 in which there are provided a heater 3 for preheating an evaporator 2 and a burner thermistor 4 for detecting temperature of the evaporator 2, and power supply to the heater 3 is turned on and off based upon detection temperature of the burner thermistor 4 to control the temperature of the evaporator 2, power supply-off temperature of the heater 3 is changed on the basis of detected temperature by a room temperature sensor 11 provided on the combustor 1. Further, in the combustor 1 in which there are provided the heater 3 for preheating the evaporator 2 and the burner thermistor 4 for detecting the temperature of the evaporator 2, and the power supply to the heater 3 is turned on and off based upon the detected temperature of the burner thermistor 4 to control the temperature of the evaporator 2, the power supply-off temperature of the heater 3 is set to be lower stepwise as the detected temperature by the room temperature sensor 11 provided on the combustor 1 becomes higher.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustor such as a petroleum fan heater and a warm air heater for vaporizing and burning liquid fuel.

[0002]

2. Description of the Related Art Conventionally, in a combustor using a liquid fuel such as an oil fan heater and a hot air heater, a preheater heater is attached to the carburetor, and the energization of the preheater is controlled to be turned on / off. Is maintained at a temperature at which fuel easily vaporizes, but the temperature at which the preheater is turned off is always set to a constant value regardless of the ambient temperature of the equipment.

[0003]

However, the above heater-off temperature is set to a high value so that the fuel can be sufficiently vaporized and stable combustion can be performed even when the device is placed in a low temperature environment, and therefore, the low temperature is set. However, it was extremely uneconomical as the temperature increased, it became relatively overheated and consumed extra power.

An object of the present invention is to solve the above-mentioned drawbacks and to provide an economical combustor capable of suppressing electric power consumption and performing stable combustion.

[0005]

That is, in the present invention, a preheater for preheating a vaporizer and a burner thermistor for detecting the temperature of the vaporizer are provided, and the preheater of the preheater is detected based on the detected temperature of the burner thermistor. In the combustor in which the temperature of the carburetor is controlled by turning on / off energization, the energization off temperature of the preheating heater is changed based on the temperature detected by the room temperature sensor provided in the combustor.

Further, according to the present invention, a preheater for preheating the carburetor and a burner thermistor for detecting the temperature of the carburetor are provided, and the energization of the preheat heater is turned on / off based on the detected temperature of the burner thermistor. In the combustor in which the temperature of the carburetor is controlled, the energization off temperature of the preheat heater is set to be gradually lowered as the detected temperature of the room temperature sensor provided in the combustor increases.

[0007]

With the above structure, the energization-off temperature of the preheat heater changes depending on the ambient temperature, so that the energization-on time of the preheat heater is shortened.

Further, in an environment where the ambient temperature is low, the temperature value for turning off the energization is set to a high value, and the temperature value for turning off the electric power is gradually set lower as the ambient temperature rises. It acts to prevent preheating.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A combustor 1 according to the present invention, as shown in FIG. 1, has a vaporizer 2 around which a preheat heater 3 is provided.
Is attached. A burner head 5 is mounted on the upper portion of the carburetor 2, and an igniter 7 and a frame rod 6 are arranged above the burner head 5.
Further, the carburetor 2 is provided with a combustion fan 9 for supplying air to the carburetor 2, and a fuel tank 12 is connected to the carburetor 2 via an oil supply pipe 10, and a fuel pump 8 is provided in the middle thereof. Has been. Further, a burner thermistor 4 is attached to the carburetor 2 for temperature detection, a room temperature sensor 11 is attached to the combustor 1 at a position in direct contact with outside air, and an operation switch (not shown) is provided on the operation panel. )
Is provided.

As shown in FIG. 2, the combustor 1 has a controller 13 incorporated therein to control the combustion operation of the equipment. In the figure, 14 is a microcomputer (hereinafter referred to as a microcomputer) for collectively controlling the combustion operation. The input port of the microcomputer 14 is provided with an operation switch 15, a burner thermistor 4, a room temperature sensor 11, a frame rod 6 and other sensor systems. It is connected. On the other hand, a drive system for the preheater 3, the fuel pump 8, the igniter 7, the combustion fan 9, etc. is connected to the output port of the microcomputer 14.

The combustor 1 according to the present invention has the above structure,
The operation is as follows. When the operation switch 15 is operated, the microcomputer 14 first turns on the power supply to the preheat heater 3 to preheat the carburetor 2. The microcomputer 14 is the vaporizer 2
Change of resistance value of burner thermistor 4 attached to
The temperature rise of the carburetor 2 due to conversion and preheating is detected and monitored. In this way, the microcomputer 14 operates the carburetor 2
When the temperature of becomes a temperature suitable for vaporizing the liquid fuel (petroleum fuel), the combustion fan 9 is started to execute the pre-purge,
After completion of the prepurge, the fuel pump 8 and the igniter 7 are operated to start the combustion of the equipment. That is, when the fuel pump 8 is operated, the petroleum fuel in the fuel tank 12 is jetted into the carburetor 2 through the fuel supply pipe 10 and is vaporized by preheating the carburetor.
Then, the vaporized gas is mixed with the air supplied by the combustion fan 9, and the mixed gas is ejected from the burner head 5, ignited by the discharge spark of the igniter 7, and the combustion operation is started.

Even after the combustion operation is started in this way, the microcomputer 14 monitors the temperature detected by the burner thermistor 4 and controls the energization of the preheat heater 3. That is, when the temperature of the carburetor 2 becomes equal to or higher than the heater off temperature, the preheat heater 3
Turn off the power. When the temperature of the carburetor 2 falls and becomes lower than a certain constant temperature (heater on temperature), the power supply to the preheat heater is restarted. In this way, the energization control of the preheating heater 3 is executed so that the petroleum fuel is vaporized satisfactorily, and the preheating is continued, and the temperature of the carburetor 2 is always maintained at the heater-on temperature or higher.

When the carburetor 2 is maintained at a high temperature due to the heat of combustion, the preheat heater 3 is hardly energized.

Here, considering the power consumption of the equipment, it is better that the above heater off temperature is as low as possible within the range where the petroleum fuel can be vaporized normally, but generally, even when the equipment is placed in a low temperature environment. It is set somewhat higher so that combustion immediately after ignition is performed stably. Therefore, when the room temperature is high, excessive preheating occurs, which is extremely uneconomical. Therefore, the purpose of the present invention is to change the setting of the heater off temperature according to the ambient temperature (room temperature) when the device is used to eliminate excessive preheating of the carburetor 2 and reduce the power consumption of the device. is there.

That is, according to the present invention, a room temperature sensor 11 (for example, a thermistor) for detecting the ambient temperature is attached to a place where the equipment is in direct contact with the outside air, and the microcomputer 14 controls the room temperature as shown in the heater energization control flowchart of FIG. The heater off temperature TOFF set in advance based on the temperature detected by the sensor 11 is selected, and the energization control process of the preheat heater 3 is executed with the selected heater off temperature TOFF as a reference value.

FIG. 4 shows an example of the heater-off temperature setting with respect to the ambient temperature (the temperature detected by the room temperature sensor 11). According to this figure, the heater-off temperature TOFF is set in five steps within the room temperature range of 5 ° C. to 20 ° C. It is set separately and controlled.
That is, in an environment where the room temperature is low, such as around 5 ° C., and petroleum fuel is difficult to vaporize, the heater off temperature TOFF is set high (eg, 280 ° C.), and the heater off temperature TOFF is gradually lowered as the room temperature rises (eg, By setting the temperature to at least 240 ° C), no matter what environment the equipment is used in, it will always be possible to achieve good vaporization of petroleum fuel and to stabilize combustion immediately after ignition. Preheating is also prevented. . Further, by performing such energization control processing, for example, as shown in FIG. 5 which shows the temperature rise T of the carburetor 2 with respect to the energization on time t of the preheat heater 3, the heater off temperature TOFF is changed from the point A to the point B. By changing the temperature to 1, the on-time of the preheater heater 3 is shortened by t2-t1 and the power consumption is reduced accordingly.

[0017]

As described above, according to the present invention,
Equipped with a preheater that preheats the carburetor and a burner thermistor that detects the temperature of this carburetor.Combustion that controls the temperature of the carburetor by turning on / off the electricity to the preheater based on the temperature detected by this burner thermistor. In the machine, since the energization off temperature of the preheat heater was changed based on the temperature detected by the room temperature sensor provided in the combustor, the energization off temperature of the preheat heater was always set to be constant under any environment as in the conventional case. Compared with the case, the energization ON time of the preheating heater can be shortened, and the power consumption can be reduced accordingly.

Further, a preheater for preheating the vaporizer and a burner thermistor for detecting the temperature of the vaporizer are provided.
In the combustor in which the temperature of the carburetor is controlled by turning on / off the energization of the preheater based on the detected temperature of the burner thermistor, as the detected temperature of the room temperature sensor provided in the combustor increases, the preheat heater Since the energization off temperature of the is set to be gradually lowered, the carburetor temperature is high in an environment where the ambient temperature is low and the oil fuel is difficult to vaporize, and conversely the ambient temperature is relatively high and the oil fuel is The temperature of the carburetor becomes low in an environment where it is easy to be vaporized, and regardless of the environment in which the equipment is used, a good vaporization action of petroleum fuel is always possible, and combustion immediately after ignition can be stabilized.

[Brief description of drawings]

FIG. 1 is a schematic configuration explanatory view showing an embodiment of a combustor according to the present invention.

FIG. 2 is a block diagram showing a control unit incorporated in the combustor shown in FIG.

FIG. 3 is a flowchart of heater energization control of a combustor.

FIG. 4 is an explanatory diagram showing an example of heater-off temperature setting with respect to ambient temperature.

FIG. 5 is an explanatory diagram showing a temperature rise of the carburetor with respect to heater energization time.

[Explanation of symbols]

 1 Combustor 2 Vaporizer 3 Preheater 4 Burner thermistor 11 Room temperature sensor

Claims (2)

[Claims] 1. A preheater for preheating a carburetor, and a burner thermistor for detecting the temperature of the carburetor. The preheater is turned on / off based on the temperature detected by the burner thermistor to turn on / off the carburetor. In a combustor for controlling temperature, the energization off temperature of the preheat heater is changed based on a temperature detected by a room temperature sensor provided in the combustor. 2. A preheater for preheating the vaporizer, and a burner thermistor for detecting the temperature of the vaporizer. The preheater is turned on / off based on the temperature detected by the burner thermistor. In a combustor for controlling temperature, the energization off temperature of the preheat heater is gradually set lower as the temperature detected by a room temperature sensor provided in the combustor increases.