JPS6367088B2 - - Google Patents

Description

[Detailed description of the invention]

In conventional vaporizing oil combustors, when kerosene vaporizes in the vaporizing chamber during combustion, the vaporization temperature (approximately 150
It gradually turns into tar due to the polymerization of molecules or minute residues (impurities) within the temperature range (~280°C), and tar (carbide) gradually adheres to the vaporization chamber and vaporization stabilizer as the combustion time progresses. Although the amount of tar varies somewhat depending on the temperature of the vaporizer, the method of vaporizing the kerosene, and the temperature rise of the kerosene, the generation of tar was unavoidable. Therefore, when the tar adheres to the vaporization chamber and the vaporization stabilizer and accumulates, the vaporization passage becomes clogged, the amount of vaporized gas decreases, the amount of combustion decreases, and other problems occur, resulting in the product becoming unusable. There was a problem in terms of lifespan. As a solution to this problem, there is a method in which the vaporization chamber and vaporization stabilizer are replaced once every two to three seasons, but even this method has various problems from the viewpoint of a commercial product. The present invention has been devised in view of the above matters,
The tar attached to the vaporization chamber and vaporization stabilizing material is
This was done by forcing air into the vaporization chamber and heating it at a temperature higher than the normal vaporization temperature. Experiments of the present invention were conducted using a Bunsen combustion type vaporizer. The outline of the experiment is to use a vaporizer that uses a temperature control circuit to control power supply to the heater (approximately 350W) at a constant vaporization temperature (240 to 280℃).The temperature control circuit is short-circuited and the heater is continuously energized. By doing so, the temperature inside the vaporizer was raised to 450 to 500°C, and the vaporization chamber and the vaporization stabilizer were heated dry in this high-temperature atmosphere. The experimental results were as follows.

[Table] Note that the above data indicates that the vaporization stabilizer is completely clogged with tar, but it is thought that it will be better if dry firing is performed early. In addition, in the table above, "forced air" refers to a method of sending air into the vaporization chamber by running the oil pump idly (3 to 3).
5 c.c./min), "natural convection" is a method in which the oil pump is stopped and air is naturally sent into the vaporization chamber through the oil pipe and return pipe. As is clear from this table, dry firing using forced air can remove tar more efficiently than dry heating using natural convection. As is clear from the above experimental results, the vaporization stabilizing material that has failed to burn due to tar clogging (if the amount of gas ejected is small and the flame is not normal even after ignition) is left in an atmosphere of about 500℃ for 1 to 2 hours. It has been found that burning can almost completely restore the original state. In addition, when dry-firing for 1 hour in an atmosphere of 300°C, the recovery is less than 20%, and the effect is extremely weak. As described above, the dry firing according to the present invention enables long-term use without replacing the vaporization stabilizer, resulting in excellent durability. The case of a Bunsen type gasification combustor will be described in detail below as an embodiment of the present invention. Reference numeral 1 designates a brass vaporizer main body forming a vaporization chamber 2. A gas injection nozzle 4 having a nozzle hole 3 is removably screwed onto the upper part of the vaporizer main body 1, and connection parts 5 and 6 on the lower side walls thereof are screwed. An oil pipe 8 communicating with the oil pump 7 and a return pipe 10 communicating with a normally open solenoid valve 9 which is closed when energized are connected. Reference numeral 11 denotes a cap that is detachably attached to the lower end opening of the carburetor main body 1. 12 is the vaporization chamber 2 from the lower end opening of the vaporizer main body 1.
It is a cylindrical brass vaporization aid that is inserted into the interior, and consists of the cylindrical part 12a and the lower cylindrical part 12b, the upper end of which abuts against the collar 13, and the lower end of which is connected to the lower opening of the vaporizer main body 1. Make it slightly more protruding,
This serves as a clue when taking out the vaporization aid 12. 14 is a recess formed in the lower cylindrical portion 12b, and a spring 15 is housed therein to constantly urge the vaporization aid 12 upward. 16 is the lower end of the upper cylindrical part 12a (i.e., the lower cylindrical part 12b
The inside and outside of the cylindrical part 12a are communicated through a plurality of holes drilled near the connecting part with the cylindrical part 12a. 17 is a vaporization stabilizing material such as foamed metal or sintered metal inserted into the upper cylindrical part 12a of the auxiliary tool 12;
2 and can be taken out from inside the vaporization chamber 2. A heater 18 is attached closely to the side wall of the carburetor main body 1, is constantly pressed against the carburetor main body 1 side by a spring 19, and the outside thereof is covered with a cover 20. During normal combustion, the heater 18 controls the temperature inside the vaporizing chamber 2 by means of a temperature sensing element 21 (positive temperature coefficient thermistor) and an electronic control circuit 22.
The temperature in the vaporizing chamber 2 is controlled to be 240 to 280°C, and when the temperature is dry, the temperature sensing element 21 is short-circuited to prevent the electronic control circuit 22 from operating, and electricity is continuously supplied so that the temperature inside the vaporization chamber 2 is approximately 500°C. controlled by. still,
23 is a fuel tank, and 24 is a burner. FIG. 2 is an electrical circuit diagram of the vaporizing oil combustor of the present invention, in which the heater 18 is operated by an electronic control circuit 22.
The heater 18 and the relay switch 25 are connected in series to a normally closed relay switch 25 that is turned on and off, and the series circuit of the heater 18 and the relay switch 25 is connected in parallel to the series circuit of the solenoid valve 9 and the normally open relay switch 26. The relay switch 26 is closed by the electronic control circuit 22 when the temperature inside the vaporization chamber 2 reaches a predetermined temperature (240 to 280 DEG C.). 27 is a switch connected in series to the oil pump 7, which is turned on and off in conjunction with the main switch 28.
When the vaporizer is empty, the oil feed pump 7 is driven to forcefully blow air into the vaporization chamber. In addition, switch 2
If the switch 7 is manually turned on and off, then by manually turning on the switch 27 during dry heating, dry heating can be performed by forced air blowing as described above. If the switch 27 is turned OFF, the oil pump 7 will not be driven, resulting in dry heating due to natural convection. Reference numeral 29 designates a short circuit switch connected in parallel to the temperature sensing element 21, and when turned on when the vaporizer is empty, the temperature sensing element 21 is short-circuited and the electronic control circuit 22
This is to prevent it from operating. Here, the operation of the vaporizing oil combustor of the present invention will be explained. First of all, when performing normal combustion,
Turn on main switch 28 and switch 2
7 is turned on, the oil pump 7 is driven and the heater 18 is energized to heat the carburetor main body 1. Initially, since the temperature of the carburetor main body 1 is low, the relay switch 26 is in the OFF state and the solenoid valve 9 is opened. Therefore, the kerosene sucked up from the fuel tank 23 by the drive of the oil pump 7 enters the carburetor body 1 through the oil pipe 8 (the inner wall of the carburetor body 1 and the outer wall of the vaporization aid 12 from the return pipe 10 to the solenoid valve 9
A circulation path is formed through which the fuel tank 23 is returned. When the temperature of the vaporizer main body 1 reaches a predetermined temperature by energizing the heater 18, the temperature sensing element 21
The resistance value suddenly changes, the electronic control circuit 22 is activated, and the relay switch 26 is closed. Therefore, the solenoid valve 9 is energized and the return passage is cut off.
The liquid level of the kerosene that has flowed into the vaporizer main body 1 gradually rises. Then, the kerosene penetrates into the vaporization stabilizer 17 through the small hole 16 of the auxiliary tool 12 and vaporizes there. The vaporization temperature at this time is 240 to 280°C, and the relay switch 25 is controlled by the electronic control circuit 22.
The ON/OFF control controls the power supply time to the heater 18, and the temperature inside the vaporization chamber 2 is always between 240 and 280℃.
will be maintained. In this way, the vaporized gas vaporized in the vaporization chamber 2 is supplied into the burner 24 through the nozzle hole 3 of the gas injection nozzle 4, and normal combustion is performed on the burner 24. Next, dry firing of the vaporizer will be explained. When driving the oil pump 7 to perform dry firing using forced air, drain the remaining oil in the fuel tank 23, turn on the short circuit switch 29 to prevent the electronic control circuit 22 from operating, and turn on the main switch 28. do. Then, the heater 18 is continuously energized and air is supplied by the oil pump 7 running dry, and the temperature inside the vaporization chamber 2 decreases.
When the temperature reaches 500°C, the vaporization chamber 2 and the vaporization stabilizer 17
The tar attached to the surface is thermally decomposed and removed. If the switch 27 is turned ON and OFF manually, dry firing can be performed by forced air blowing by manually turning ON the switch 27 and then performing the same operation as above. In addition, if switch 27 is turned off manually,
As shown in the table of the experimental results described above, the removal efficiency of tar is lower than dry firing using forced air flow as in the present invention, but dry heating is performed using natural convection without driving the oil pump 7. In this case, air is supplied to the vaporization chamber 2 through a normally open electromagnetic valve 9. The present invention provides a vaporization stabilizing material in the vaporization chamber of a vaporizer body equipped with an electric heater, supplies liquid fuel into the vaporization chamber from a fuel reservoir by a pump, and supplies the vaporized gas here to a gas injection nozzle. In a vaporizing oil combustor that burns with a guide burner, a switch means (for example, switch 27) is provided to turn on the pump when the dry firing means for removing tar in the vaporizing chamber is operated. Therefore, when emptying the fuel reservoir and performing dry firing, the tar content can be efficiently removed by turning on the pump and forcibly sending air into the vaporization chamber.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a vaporizing oil combustor of the present invention, and FIG. 2 is an electrical circuit diagram of the same vaporizing oil combustor. 1: Vaporizer main body, 2: Vaporization chamber, 4: Gas injection nozzle, 17: Vaporization stabilizer, 18: Heater, 2
4: Burner.

Claims (1)

[Scope of Claims] 1. A vaporization stabilizing material is provided in the vaporization chamber of the vaporizer main body equipped with an electric heater, and liquid fuel is supplied into the vaporization chamber by a pump from a fuel storage section, and the vaporized gas is vaporized here. In a vaporizing type oil combustor in which gas is guided to a gas injection nozzle and combusted by a burner, a dry-burning means for energizing the electric heater to maintain a temperature inside the vaporizer at a dry-burning temperature higher than that during normal combustion; A vaporizing oil combustor comprising: a switch means for turning on the pump and causing it to run dry when the combustion means is in operation.