JPS63156918A - Liquid fuel vaporizing type burner - Google Patents

Abstract

PURPOSE:To prevent tar from generating in the vaporizing part of the burner by subjecting surface treatment having a cleaning effect to the vaporizing part of an evaporator and warming the same by actuating a heater at the time of extinguishing fire, in the title burner used in a kerosene fan heater or the like. CONSTITUTION:A self-cleaning coaling 7 has been applied to an evaporator 3 beforehand. When an operating switch 13 is turned OFF, a combustion control section 11 stops the combustion of a burner 5. Upon this occasion, a vaporizing temperature set value is made high, an operating switch 13 is changed over to the side of a warming circuit part 14. By these operations, a vaporizing temperature control part 12 controls a heater 2 by the comparison between the set temperature of the evaporator 3 set by the warming circuit 14 and the detected temperature of the evaporator temperature sensor 6 and maintains the evaporator 3 at a predetermined temperature only for a preset period of time of a timer 15. Accordingly, during this time, the self-cleaning coating functions to clean the evaporator. Thus, the adherence of tar to the vaporizing part can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a vaporization type combustor that vaporizes and burns liquid fuel such as kerosene, and particularly relates to prevention of generation of tar in the vaporization section.

2. Description of the Related Art Conventionally, this type of vaporization type combustor has been widely used in indoor heating systems such as oil fan heaters. For example, as shown in FIG. The air is vaporized in a heated vaporizer a, mixed with air supplied by a fan 4, and burned in a burner 5. Here, the temperature of the vaporizer 3 is detected by a vaporization temperature sensor 6, and the temperature is controlled to a constant temperature by a heater controller (not shown). In this method, when burner 5 is burnt for a long time,
Alternatively, when defective kerosene is combusted, tar, which is a high-boiling point component in the kerosene, may adhere to the surface of the vaporizer, such as the vaporizer wall, and the vaporization performance may deteriorate, resulting in combustion failure. To solve this problem, a method described in Japanese Utility Model Application Publication No. 59-55226 has been proposed.

As shown in FIG.
The surface is treated with a self-cleaning coating 7 having a self-cleaning effect such as manganese dioxide or aluminosilicate. With this configuration, the liquid fuel is transferred to the vaporization wall 3 of the vaporizer 3.
When the fuel undergoes heat of vaporization and becomes vaporized gas in step a, residues such as high boiling point components in the fuel adhere in the form of tar, but the oxidation rate is increased by catalysts such as manganese dioxide and aluminosilicate in the cleaning device 7. The tar is oxidized,
Decomposes into water and carbon dioxide.

Problems to be Solved by the Invention The conventional configuration described above requires two elements: a temperature above a certain level is required to obtain the catalytic effect, and a certain period of time is required for oxidation by the catalyst. It is.

However, in the configuration shown in FIG. 3, while the burner 5 is burning, the vaporizer 3 is kept at a constant temperature by heating by the heater 2 or by heat conduction from the burner 5, but when the burner 5 stops burning, the vaporizer 3 is kept at a constant temperature. The remaining fuel adheres to the inner wall 3a of the vaporization chamber, and heating of the vaporizer 3 is also stopped at this time, so that the temperature and time required for the self-cleaning coating 7 to obtain a catalytic effect are not satisfied. Therefore, it adheres to the walls of the vaporization chamber as tar. There was a problem in that the tar accumulated as the combustor was repeatedly started and stopped, leading to a decline in vaporization performance. In order to solve this problem, the vaporizer 3 is heated to a certain temperature or higher by the heater 2 at the beginning of operation.
A method of supplying fuel by the pump 1 after oxidizing the tar is also considered, but in this case, the waiting time until the burner 5 starts combustion is long, and this is difficult to realize in a heater that requires immediacy.

Means for Solving the Problems In order to solve the conventional problems, the liquid fuel vaporizing combustor of the present invention includes a vaporizer that vaporizes liquid fuel by energizing a heater, and a burner that burns the vaporized fuel. a controller that includes a vaporizing temperature control unit that controls the combustion of the burner and controls energization of the heater based on a signal from a vaporizing temperature sensor that detects the temperature of the electrifier, and an operation switch that instructs the burner to turn on and off. The vaporizer has a surface treatment that has a cleaning effect on the vaporizing part of the vaporizer, and the vaporizing temperature control part has a warming circuit part that drives and controls the heater even when the burner is extinguished using the operation switch. It is.

Effect of the Invention According to the present invention, even when the operation switch is off due to the above-described configuration, the carburetor is preheated, so even if residual fuel in the carburetor adheres to the wall of the vaporization chamber as tar, self-cleaning is possible. It has the effect of being oxidized by the catalytic action of the paint, and cleaning is completed by the time the next combustion starts.

Example Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 1 shows a configuration diagram of an embodiment of a liquid fuel vaporization type combustor 8 of the present invention. Figure 1 is an example of a heater, and parts that operate in the same way as in Figure 3 are given the same numbers.

Liquid fuel stored in a fuel tank (not shown) is supplied to the carburetor 3 by a fuel pump 1 through a fuel pipe 9. The vaporizer 3 is heated by the heater 2 and vaporizes the fuel. A self-cleaning coating 7 is applied to the vaporizer a. The vaporized fuel is mixed with combustion air supplied by the blower motor 4, ignited by an ignition iM (not shown), and burned in the burner 5.

The fuel pump 1, vaporization heater 2, and blower motor 4 are driven and controlled by a controller 10.

The fuel pump 1 and the blower motor 4 are controlled by a combustion control section 11 to control the amount of fuel supplied and the amount of combustion air so that the temperature of the room is constant. On the other hand, the heater 2 is controlled by the vaporization temperature control section 12 so that the temperature of the vaporizer 3 detected by the vaporization temperature sensor 6 is maintained at a preset temperature.

Reference numeral 13 denotes an operation switch for instructing the operation of the combustor 8. When the operation switch 13 is turned on, the combustor 8 operates and the burner 5 starts combustion. Here, when the operation switch 13 is turned off, the warming circuit 14 operates, and only the vaporization temperature control section 12 continues to operate. At this time, the temperature setting of the vaporizer 3 may be switched to the lowest temperature at which the self-cleaning coating 7 can act as a catalyst.

15 is a timer that determines the operating time of the warming circuit section 14, and the heater 2 continues to heat the vaporizer 3 for the time necessary for the cleaning coating 7 to oxidize the tar through catalytic action (for example, 3 hours). .

FIG. 2 shows a specific circuit diagram of the main part of the present invention.

Parts that are the same as in Figure 1 are given the same numbers. A DC power supply circuit 16 supplies power to the combustion control section 11, the warming circuit section 14, the vaporization temperature control section 12, and the like. Combustion control section 11
When the operation switch 13 is turned on (a contact), the fuel pump 1 is turned on to burn the burner 5 shown in FIG.
? and drives and controls the blower motor 4. At the same time, a temperature setting signal C for the vaporizer 3 is output to the vaporization temperature control section 12.

The vaporization temperature control section 12 compares the set temperature signal C from the combustion control section 11 and the signal d from the vaporization temperature sensor 6 with a comparator 17 and outputs a signal to the transistor 18 . Here, the comparator 17 uses a commonly known operational amplifier (○P amplifier). Now, when the temperature of the vaporization temperature sensor 6 is lower than the set temperature, the potential c<d and the output potential e becomes high.

This turns on transistor 18 and drives relay 19. A contact 20 of the relay 19 is connected to a power source 20 in series with the vaporization heater 2 of the vaporizer 3, and when the relay 19 is turned on, the contact 20 becomes conductive and supplies power to the heater 2. When the temperature of the vaporization temperature sensor 6 rises and becomes higher than the set temperature, the transistor 18 is turned off, thereby stopping power supply to the heater 2. In addition to this, the heater may be controlled by stepless power control.

The above operation is the same as that of a conventional combustor, and when the operation switch 13 is turned off here, the combustion control section 11 stops combustion of the burner 5. At this time, the vaporization temperature set value C is designed to be high (equivalent to 10 potentials of the power supply). At the same time, the contact point of the operation switch 13 is also switched to b, and the humidity setting value of the vaporizer is changed to the resistance 21 of the warming circuit section 14.
After that, the vaporization temperature control section 12 compares this temperature with the temperature of the vaporization temperature sensor 6 to drive and control the heater 2. The diode 23°24 is
It constitutes an OR circuit and switches the set temperature of the vaporizer between C and the amount depending on whether the operation switch 13 is turned on or off.

When the warming circuit section 14 operates, the timer 15 starts counting time and opens the contact 25 when a predetermined time has elapsed. When the contact 25 is turned off, the potential f is maintained high, so no matter how much the temperature of the vaporization temperature sensor 6 decreases, the potential d>f will never become higher and the heater 2 will not be energized.

In other words, when the timer 15 elapses for a predetermined period of time, the operation of the warming circuit section 14 is stopped, and the power supply to the heater 2 is also stopped, thereby reducing power consumption. It will be initialized if you turn it on.

The indicator 26, here using a light emitting diode (LED), lights up when the operating switch 16 is off and the warming circuit 14 is operating, to indicate that the controller is energized.

The setting time of the timer 15 may be set to a time sufficient for the self-cleaning coating 7 to oxidize tar by catalytic action, for example, 3 hours, but by setting this time to 24 hours, the burner can be operated every day. The vaporizer 3 can be kept preheated whenever it is used. Also, instead of the timer 15, a switch is used to turn on and off the contacts 25, making it easy for the user to clean the contacts 25 if deemed necessary.

In addition, in the embodiment, self-cleaning coating was explained using an example using manganese dioxide or aluminosilicate, but it is also possible to use coating with a similar effect using other materials, or to use enamel or other surface treatment.Details of the Invention As explained above, the liquid fuel vaporizing combustor of the present invention has the following effects.

(1) Since the warming circuit preheats the carburetor even when the operation switch is turned off and the combustion machine is not operating, the tar adhering to the fuel remaining after the pump stops is removed from the self-cleaning paint on the catalyst. It is sufficiently oxidized by the action, and even if inferior fuel is used, the performance of the carburetor will not be reduced.

(2) Since the carburetor is always preheated, when the operation switch is turned on, the time required for the carburetor to reach the 7-grade level where the fuel can be vaporized is short, and the burner is quickly ignited, making it especially suitable for heaters. It is very convenient and easy to use because it warms up immediately when you use it.

[Brief explanation of the drawing]

FIG. 1 is a block diagram illustrating the configuration and control operation of a liquid fuel vaporization type combustor according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing a specific circuit example of the main part of the controller, and FIG. FIG. 2 is a configuration diagram of a conventional combustor. 2... Heater, 3... Carburizer, 5...
...burner, 6... vaporization temperature sensor, 7...
... Self-cleaning coating, (surface treatment with cleaning effect), 8 ... Combustor, 10 ...
... Controller, 12 ... Vaporization temperature control section, 13 ... Operation switch, 14 ... Warming circuit section, 15 ... Timer. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3: Vπ壓hi花 - Figure 3

Claims (2)

[Claims] (1) A combustor that includes a vaporizer that vaporizes liquid fuel by energizing a heater, a burner that burns the vaporized fuel, and a signal from a vaporization temperature sensor that controls the combustion of the burner and detects the temperature of the vaporizer. The controller includes a vaporizing temperature control unit that controls energization to the heater and an operation switch that instructs to turn on and off the burner, and performs a surface treatment that has a cleaning effect on the vaporizing unit of the vaporizer, and controls the vaporizing temperature. The part is a liquid fuel vaporizing combustor having a warming circuit part that drives and controls the heater even when the burner is extinguished by the operation switch. (2) The liquid fuel vaporizing combustor according to claim 1, wherein the warming circuit section has a timer that stops its operation after a certain period of time has passed after the operation switch is turned off.