JP2002022117A - Vaporizing combustion apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the time required for preheating a vaporizer in a vaporizing combustion apparatus. SOLUTION: There are provided a vaporizer 1 for vaporizing a liquid fuel, a sheathed heater 2 having a coiled heating wire 14 for heating the vaporizer 1, a fuel injection nozzle 5 provided toward the inside of the vaporizer 1 through a combustion air intake port 4 opened in the vaporizer 1, and a burner section 8 provided downstream of the vaporizer 1. The sheathed heater 2 is adapted such that there is formed denser than other portions coil density of the heating wire 14 in the vicinity of a collision surface 7 where a fuel injected from the fuel injection nozzle 5 on the internal surface of the vaporizer 1 collides.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vaporization type combustion apparatus for heating and evaporating liquid fuel such as kerosene used for a heater such as a fan heater or a water heater and burning it.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 10-2111016, this type of vaporization type combustion apparatus is provided with a fuel injection nozzle provided on a bottomed cylindrical carburetor from the side wall thereof. A sheath heater buried in a substantially annular shape in the carburetor uniformly heats the entire carburetor in the circumferential direction during preheating, and a collision surface against which fuel injected from the fuel injection nozzle collides, The inner surface of the vaporizer other than the collision surface was heated with the same heat generation per unit length by the sheathed heater in which the coil density of the coil-shaped heating wire was formed uniformly.

[0003]

However, in this prior art, the collision surface which most contributes to the vaporization of the fuel requires a large amount of heat because low-temperature fuel collides and the heat of vaporization is deprived. In contrast, the inner surface of the vaporizer other than the collision surface does not directly contribute to vaporization and does not require as much heat as the collision surface, but uniformly heats the collision surface and the other vaporizer inner surfaces. Therefore, since the heat is not efficiently distributed, the inner surface of the carburetor other than the collision surface is heated more than the required amount of heat and consumes extra power, and the temperature of the collision surface is reduced to a temperature at which fuel can be vaporized. However, it took a long time to complete the heating, and the time required to complete the preheating was long, and the ignition was delayed, which was inconvenient.

[0004]

In order to solve the above-mentioned problems, the present invention focuses on this point. In particular, the present invention comprises a vaporizer for vaporizing liquid fuel and a vaporizer having a coil-shaped heating wire. A sheath heater for heating, a fuel injection nozzle provided toward the inside of the carburetor via a combustion air intake port opened to the carburetor, and a burner provided downstream of the carburetor, The sheath heater is formed such that the coil density of the heating wire near the collision surface on the inner surface of the carburetor where the fuel injected from the fuel injection nozzle collides is higher than other portions.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, a vaporizer 1 for vaporizing a liquid fuel and a sheath heater 2 having a coil-like heating wire 14 embedded in the vaporizer 1 for heating the vaporizer 1 are provided.
And a combustion air inlet 4 opened on the side of the carburetor 1
A fuel injection nozzle 5 provided toward the inside of the carburetor 1 through the carburetor 1, and a burner section 8 provided downstream of the carburetor 1. The sheathed heater 2 is provided on the inner surface of the carburetor 1. Since the coil density of the heating wire 14 in the vicinity of the collision surface 7 where the fuel injected from the fuel injection nozzle 5 collides is formed denser than the other portions, the collision surface 7 having a large required amount of heat is heated more, The inner surface of the carburetor 1 other than the collision surface 7 that requires a small amount of heat is heated to a small amount, the heat generated by the sheath heater 2 is efficiently distributed, and the temperature of the collision surface 7 can be quickly increased.

[0006]

Next, an embodiment according to the present invention will be described with reference to FIGS.

Reference numeral 1 denotes a bottomed cylindrical vaporizer, and reference numeral 2 denotes a sheath heater for heating the vaporizer 1 to a temperature at which the liquid fuel can be vaporized. The sheath heater is embedded in a substantially annular shape above the vaporizer 1.
Reference numeral 3 denotes a combustion fan that supplies combustion air into the carburetor 1 from a combustion air intake port 4 opened on a side wall of the carburetor 1. 5
Reference numeral denotes a fuel injection nozzle provided from the combustion air inlet 4 to the inside of the carburetor, and reference numeral 6 denotes a fuel pump for pumping fuel to the fuel injection nozzle 5. Reference numeral 7 denotes a collision surface on the inner surface of the carburetor 1 where the fuel injected from the fuel injection nozzle 5 collides.

Reference numeral 8 denotes a canned cylindrical burner mounted and fixed on the upper portion of the vaporizer 1. A plurality of flame holes 9 are opened in the side wall of the burner 8, and the burner 8 is in close contact with the outer periphery of the side wall. In addition, a rectifying mesh 10 is provided. Numeral 11 is an annular heat recovery unit which is provided upright on the outer periphery of the burner unit 8 with a space therebetween.
This is to reduce the input. Reference numeral 12 denotes a temperature sensor which is attached to the outer periphery of the carburetor 1 on the back of the collision surface 7 and detects the temperature of the carburetor 1. The temperature sensor 12 is connected to a control device (not shown) so that the collision surface 7 can vaporize fuel. Detects if the temperature has been reached. Reference numeral 13 denotes a spark rod which is driven by the control device to ignite when the temperature of the vaporizer 1 reaches a temperature at which fuel can be vaporized.

The sheathed heater 2 is composed of a coil-shaped heating wire 14 provided at the center of the cross section and an insulator 15 around the coil-shaped heating wire 14. In this case, the coil density is formed densely to increase the amount of heat generated per unit length, and in other portions, the coil density is formed coarser than that in the vicinity of the collision surface 7 so that the heat generated per unit length is generated. When the sheath heater 2 is turned on at the time of preheating, the collision surface 7 which most contributes to the vaporization of the fuel and requires a large amount of heat can be preferentially heated, and the collision surface 7 can be efficiently used. It can be preheated to a temperature where fuel can be vaporized quickly.

After the preheat is started and the sheath heater 2 is turned on, when the temperature sensor 12 provided on the back of the collision surface 7 detects that the fuel has reached a temperature at which the fuel can be vaporized, the control device starts the combustion fan. 3 and the fuel pump 6 are driven,
The fuel injected from the fuel injection nozzle 5 into the carburetor 1 collides with the collision surface 7 and is vaporized, becomes a mixed gas mixed with the combustion air, and is ejected from the flame hole 9 to the outside of the burner portion 8 to form a spark rod. 13 is ignited by a discharge spark.

Next, another embodiment of the present invention will be described with reference to FIGS.
It will be described based on. The same components as those in the previous embodiment are denoted by the same reference numerals.

In another embodiment, the carburetor 1 is box-shaped and has a combustion air inlet 4 opened at the front thereof.
The bottom surface is opened to communicate with the mixing chamber 16, and the burner section 8 is disposed above the mixing chamber 16 on the back side of the vaporizer 1.
The heat of combustion in the burner section 8 is recovered by a heat recovery section 11 provided on the back of the vaporizer 1.
The temperature sensor 12 for detecting the temperature of the carburetor 1 is attached to the top surface of the vaporizer 1.

The box-shaped carburetor 1 is provided with a U-shaped sheathed heater 2, and the coil-shaped heating wire 14 inside the sheathed heater 2 has a dense coil density only in the vicinity of the collision surface 7. It has increased the calorific value per unit length. Therefore, when the sheath heater 2 is turned on at the time of preheating, the collision surface 7 which most contributes to the vaporization of the fuel and requires a large amount of heat can be preferentially heated, and the collision surface 7 can be quickly vaporized without waste. It can be preheated to a possible temperature.

As described above, since the collision surface 7 which requires a large amount of heat is heated more and the inner surface of the carburetor 1 other than the collision surface 7 is heated less, the efficiency of the sheath heater 2 having the same wattage as that of the prior art is improved. The amount of heat to be distributed to heat the collision surface 7 to a temperature at which fuel can be vaporized, the waiting time until ignition can be reduced, and the sheath heater 2 has a large capacity. The heating capacity can be improved without changing the vaporizer, and the vaporizer 1 does not become large.

[0015]

As described above, according to the present invention, the heat can be efficiently distributed, the temperature of the collision surface with which the fuel on the inner surface of the carburetor collides can be quickly raised, and the vaporization of the other than the collision surface can be achieved. Since the inner surface of the vessel is not heated more than necessary, the heating capacity can be improved without changing the sheathed heater to one having a large capacity, so that the vaporizer does not become large and extra power is consumed. The time required for preheating can be reduced by suppressing the temperature, and the usability is improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a sheathed heater of the same embodiment.

FIG. 3 is a schematic configuration diagram of another embodiment of the present invention.

FIG. 4 is an explanatory diagram of a sheathed heater according to another embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 carburetor 2 sheath heater 4 combustion air intake 5 fuel injection nozzle 7 collision surface 8 burner section 14 heating wire

Claims (1)

[Claims] 1. A vaporizer for vaporizing a liquid fuel, a sheath heater having a coil-like heating wire and heating the vaporizer,
A fuel injection nozzle provided toward the inside of the carburetor through a combustion air intake port opened to the carburetor, and a burner unit provided downstream of the carburetor, the sheathed heater includes: A vaporization type combustion device wherein the coil density of the heating wire in the vicinity of a collision surface where fuel injected from the fuel injection nozzle collides on the inner surface of the carburetor is formed denser than other portions.