JPH0794893B2 - Liquid fuel combustion device - Google Patents

Description

TECHNICAL FIELD The present invention relates to vaporization amount control of a vaporization type liquid fuel combustion apparatus.

2. Description of the Related Art In a conventional vaporization type liquid fuel combustion apparatus of this type, as shown in FIG. 4, a vaporizer 1 is desired in a primary air passage 3 of a vaporization burner main body 2 and faces an inlet 5 of a mixing tube 4. A motor 7 for rotating the shake-off plate 6 inside the carburetor 1 is provided, and the motor 7 is surrounded by an outer box 9 having a communication hole 8 to the primary air passage 3.

A flame hole plate 10 is provided above the mixing tube 4 to form a combustion section, and a blower for combustion air is provided at the other end of the primary air passage 3.
11 is provided, an oil supply pipe 13 for supplying liquid fuel by a pump 12 is provided near the shaker plate 6, and the vaporizer 1
Is provided with a controller 14 for controlling energization to and temperature control of the pump 12 and the discharge capacity of the pump 12.
When the temperature of vaporizer 1 exceeds a certain value by 14 pump
A predetermined amount of fuel supplied to the shaker plate 6 via the oil supply pipe 13 is activated by the rotation of the motor 7, is atomized, and is scattered and vaporized on the vaporization surface of the carburetor 1. The generated vaporized gas enters the inlet 5 of the mixing tube 4 together with the combustion primary air sent from the blower 11 through the primary air passage 3, becomes an air-fuel mixture, and is blown out from the flame hole plate 10 and burned.

However, in the above configuration, when the heater capacity of the carburetor 1 is set to the vaporization capacity limit due to the restriction of the power supply capacity, when the power supply voltage decreases, the heater voltage is squared. Since the amount of heat generation is reduced, the amount of heat generated is reduced, and there is a problem that the fuel cannot be completely vaporized.

The present invention solves such a conventional problem, and an object thereof is to prevent incomplete vaporization in a vaporizer.

Means for Solving the Problems In order to solve the above problems, a liquid fuel combustion apparatus of the present invention includes a vaporizer having a vaporization heater, a burner portion communicating with the vaporizer, and liquid fuel supplied to the vaporizer. A pump,
Power supply input voltage detection means for heater input and pump capacity control means for changing the liquid combustion supply amount in proportion to the square of the voltage when the voltage becomes equal to or lower than the set voltage are provided.

Effect The present invention has the above-described configuration, when the power supply voltage decreases, the input voltage to the heater is detected, and when the voltage becomes equal to or lower than the limit voltage setting value at which complete vaporization cannot be performed, the pump discharge amount is set to the heater input voltage by the pump capacity control means. Since the amount of heat generated by the heater is proportional to the square of the voltage and the amount of liquid fuel supplied to the carburetor by the pump is balanced, the complete vaporization can be achieved at all times.

Embodiment One embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 and 2, reference numeral 15 is a vaporization motor, the vaporization motor 15 is arranged in a box-shaped primary air chamber 16, and both shafts 17 of the vaporization heater 15 are side walls of the primary air chamber 16. A rotary atomizing means 19 which penetrates through a through hole 18 provided in the section and spreads in a conical shape at the tip thereof is attached. An oil supply pipe 20 is arranged near the inner surface of the rotary atomizing means 19, and the other end is connected to an oil receiving tank 22 via a pump 21.

A vaporization means (hereinafter referred to as a vaporizer) 23 is provided by a vaporization cover 24 with a gap surrounding the rotary atomization means 19 and a mixer passage is provided between the vaporization cover 24 and the primary air chamber 16. 25 are formed. A burner head portion 26 is connected to the upper portion of the mixer passage 25, and a flame hole plate 27 is arranged at the uppermost portion of the burner head portion 26. A secondary air passage 28 is formed so as to surround the burner head portion 26, and a secondary air port 29 is arranged near the flame hole plate 27. An air chamber 30 is formed below the secondary air passage 28 so as to surround the upper part of the primary air chamber 16, and a primary air inlet 31 is formed in a wall portion of the primary air chamber 16 facing the air chamber 30. A primary air outlet 32 is formed in the lower side wall of the primary air chamber 16 and communicates with the lower portion of the mixture passage 25. A return pipe 33 is arranged at the bottom of the mixture passage 25, and the other end is connected to the oil receiving tank 22. A combustion fan 34 is arranged below the air chamber 30.

An electric heater 35 is embedded in the vaporizer 23, and a temperature detector 36 is provided in a part of the vaporizer 23, and the input to the heater 35 is controlled by the temperature detected by the temperature detector 36. A temperature controller 37 for controlling the temperature of the vaporizer is provided.

The temperature controller 37 is connected to an input power source, and an input voltage detector 38 is provided between them.

A discharge capacity controller 39 that controls the discharge amount of the pump 21 is provided, and is connected by a connection that takes in the signal of the input voltage detector 38.

In the above configuration, when the heater 35 of the carburetor 23 starts to be energized, the temperature of the carburetor 23 rises, and when the temperature detector 36 reaches the ignition set temperature, the main controller (not shown)
Combustion operation is started by the temperature controller 37
23 is kept at a constant temperature.

At the time of combustion, the liquid fuel is supplied to the rotary atomizing means 19 through the oil supply pipe 20 in the oil receiving tank 22 by the operation of the pump 21, atomized by the rotation of the vaporization motor 15, and the vaporization surface of the vaporizer 23 is reached. Be vaporized.

The combustion primary air is supplied by the operation of the combustion fan 34, and flows from the air chamber 30 through the primary air inlet 31 to the primary air chamber 16
Flowing down, reaching the mixture passage 25 via the primary air outlet 32, rising to mix with the vaporized gas to become a premixed gas, reaching the burner head portion 26, and further ejected from the flame hole plate 27 for combustion. To do. On the other hand, the secondary air for combustion flows from the air chamber 30 to the secondary air passage 28, is ejected from the secondary air port 29, hits the flame formed on the flame hole plate 27, and shortens the flame length to perform high-load combustion. Is done. The condensed fuel cooled by coming into contact with the mixture passage 25 and the inner wall of the burner head portion 26 is returned to the oil receiving tank 22 through the return pipe 33.

Here, when the input power supply voltage drops during combustion, as shown in FIG. 3, the vaporization capacity drops to the heater 35 in proportion to the square of the input voltage, and intersects with the discharge amount of the pump 21. Happen to reach. If the discharge amount is not reduced as it is, the fuel supplied to the carburetor 23 cannot be vaporized by the difference between the vaporization capacity corresponding to the power supply voltage and the fuel supply amount, and incomplete vaporization occurs, and When the voltage detected by the input voltage detector 38 falls below a certain set value, the discharge capacity controller 39 makes it proportional to the square of the voltage. Since the discharge amount from the pump 21 is reduced, it balances with the heat generation amount of the heater, which is proportional to the square of the voltage.
The amount of fuel supply is controlled so as not to exceed the vaporization capacity line, so that complete vaporization is always possible, and the generation of tar and extinguishing odor can be prevented.

Effects of the Invention As described above, according to the liquid fuel combustion apparatus of the present invention, the following effects can be obtained.

A vaporizer, a power supply voltage detection means for input to the vaporizer heater,
Since it has a pump capacity control means for changing the liquid fuel supply amount in proportion to the square of the voltage when the voltage is lower than the set voltage, even if the input power supply voltage decreases, the pump discharge amount also decreases, so Complete vaporization does not occur, and tar generation and extinguishing odor can be prevented.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a waist portion of a liquid fuel combustion apparatus according to an embodiment of the present invention, FIG. 2 is a transverse sectional view of the apparatus, and FIG. 3 is a diagram showing input power supply voltage, vaporization capacity and pump discharge amount of the apparatus. FIG. 4 is a characteristic diagram showing the relationship, and FIG. 4 is a transverse sectional view of a conventional liquid fuel combustion device. 21 …… Pump, 23 …… Vaporizer, 26 …… Pana head part,
35: Heater, 38: Input voltage detector, 39: Discharge capacity controller.

 ─────────────────────────────────────────────────── ───Continued from the front page (56) References Shown 57-36450 (JP, U) Shown 58-29508 (JP, U) Shown 62-18562 (JP, U)

Claims (1)

[Claims] 1. A vaporizer containing a vaporization heater, a burner portion communicating with the vaporizer, a pump for supplying liquid fuel to the vaporizer, and a power supply input voltage detection means for inputting the vaporization heater. And a pump capacity control means for changing the liquid fuel supply amount in proportion to the square of the voltage when the voltage becomes lower than a set voltage.