JPS6350607B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a liquid fuel combustion apparatus configured to heat, vaporize, and burn liquid fuel.

Configuration of conventional examples and their problems Conventional liquid fuel combustion devices, for example, oil combustion machines having a rotary atomization mechanism, as shown in FIG. The atomized fuel is mixed with the primary air from the fan 2 and supplied to the burner section, and the heater 4 is equipped with a heater 4 that heats and vaporizes the atomized fuel scattered around the outer periphery of the rotating body 3. A mixed gas flow of vaporized fuel and primary air generated in the vaporization cylinder 5 is guided to a burner head 6 fixedly attached near the tip opening of the vaporization cylinder 5. Combustion is started by an ignition electrode 8 located on the combustion chamber 7 side.

According to this configuration, in order to heat and vaporize the liquid fuel and burn it, the temperature of the inner circumferential surface of the vaporization cylinder 5 must be approximately 200 to 300°C.
At startup, the vaporizer cylinder 5 must be preheated for a considerable period of time by the heater 4. In addition, in order to suppress the energization of the heater 4 as much as possible after the start of combustion, and to maintain the temperature of the vaporization tube 5 by recovering heat from the combustion flame, the vaporization tube 5 is made of a material with a large heat capacity and good thermal conductivity. , shape, the preheating time of the vaporizing cylinder 5 becomes longer, and in actual use, there is a long waiting time between the start of operation of the equipment and the start of combustion, and the energization time of the heater 4 is also increased. There was a problem that running costs were high because the length was long.

Purpose of the Invention The present invention has been made in view of the above-mentioned problems, and aims to dramatically shorten the preheating time of the carburetor cylinder, shorten the waiting time until combustion starts, and reduce running costs. It is something.

Structure of the Invention In order to achieve the above object, the present invention provides that the vaporizer cylinder is
It consists of a heating section equipped with a heater and a heat recovery section that receives heat from the combustion flame, and these two sections are configured to be able to come into contact with each other at will, so that they are separated during preheating and are brought into close contact after combustion starts.

DESCRIPTION OF EMBODIMENTS One embodiment will be described below. FIG. 2 shows a rotary vaporization type liquid fuel combustion apparatus. In the figure, 9 is a cylindrical burner case, 10 is a burner case lid, 11 is a cylindrical combustion tube, 12 is a motor fixed to the bottom of the burner case 9 via a cushioning material 13 such as packing, and the motor shaft One end of the burner case 14 enters the burner case lid 10 and extends to a position close to the combustion tube 11. Further, an air intake port 15 is provided on the side of the burner case 9. 16 is a turbo fan installed and fixed in the middle of the motor shaft 14 in the burner case 9;
19 is a blowing chamber formed by a combination of a turbo fan 16 and a guide blade 18, and 19 is a guide blade 18.
A relatively large primary air inlet 20 through which the motor shaft 14 passes is provided in the center of the partition plate fixed to the burner case 9 at appropriate intervals, and several small secondary air intakes are provided in the periphery of the partition plate. 21 is provided. As a result, the blown air that has passed through the guide vane 18 is divided into two parts, one of which passes through the primary air inlet 20 of the partition plate 19 and becomes primary air, and the other passes through the secondary air inlet 21 of the partition plate 19. and becomes secondary air. 21 is the partition plate 1 inside the burner case 9
It is a substantially cylindrical vaporizing cylinder installed in a space on the leeward side of 9, and is composed of a heating section 22 and a heat recovery section 23, and between the heating section 22 and the heat recovery section 23, there is a A gap a is provided that allows for close contact due to mutual thermal expansion. Further, a sheathed heater 24 is embedded in the heating section 22. Vaporizer cylinder 21
The internal space is a mixing chamber 25 communicating with the primary air inlet 20, and the vaporizing cylinder 21 and burner case 9
There is a secondary air chamber 26 communicating with the secondary air inlet 21. At the tip of the motor shaft 14 protruding into the mixing chamber 25, a conical cone 27,
A disk-shaped swinging plate 28 and a stirring blade 29 having an umbrella-shaped cut-and-raised blade are fastened with fixing nuts in the above order. 30 is a liquid fuel supply pipe,
Liquid fuel (kerosene) from a pump (not shown) is supplied to the corner of the joint between the cone 27 and the swinging plate 28. A burner head 31 is installed and fixed near the opening at the tip of the vaporizing tube 21 facing the combustion tube 11 and has a large number of flame holes. An air outlet 32 is provided. This secondary air outlet 32 is provided with a secondary air passage 33 for guiding secondary air from the secondary air chamber 26, and a secondary air passage 34 is also provided in a part of the vaporization cylinder 21 facing the secondary air passage 33. There is. Therefore, the secondary air in the secondary air chamber 26 passes through the secondary air passages 34 and 33 and is discharged from the secondary air injection port 32. 35
is an ignition electrode, and the burner head 31 is provided with a cut-and-raised portion 36 facing the ignition electrode 35, forming an ignition flame hole 37 and an ignition electrode 38.

In the above configuration, during combustion, the sheathed heater 24 is first energized to heat the heating section 22 of the vaporization tube 21, and the heating section 22 gradually expands. When the temperature of the heating section 22 rises to a set temperature sufficient to vaporize the liquid fuel, the motor 12 is started. As the motor shaft 14 rotates, the turbo fan 16, cone 27, swing plate 28, and stirring blade 29 also rotate. Due to the rotation of the turbo fan 16, the combustion air becomes primary air which enters the mixing chamber 25 through the air intake 15, and the other becomes secondary air which enters the secondary air chamber 26 through the secondary air inlet 21. On the other hand, the fuel pump is activated, and the liquid fuel is scattered through the pipe 30 and onto the inner surface of the heating section 22 of the vaporization cylinder 21 at the outer peripheral end of the swinging plate 28 . At this time, since the heating section 22 has already been heated as described above, the atomized fuel instantly vaporizes and becomes vaporized fuel. On the other hand, since primary air is sent into the vaporization cylinder 21 from the primary air inlet 20, the vaporized fuel and primary air are mixed to form a mixed gas flow. The mixed gas flow passes through the burner head 31, where it is ignited by the ignition electrode 35, producing a blue flame f.

In addition, after the blue flame f is generated, the heat recovery section 2 of the vaporization tube 21
3 rapidly rises in temperature and thermally expands by receiving heat from the blue flame f. At the same time, when the temperature reaches a temperature sufficient to vaporize the liquid fuel, it comes into close contact with the heating part heated and expanded by the sheathed heater 24 due to thermal expansion, and the temperature of the entire vaporization cylinder 21 is raised by the blue flame f.
The sheathed heater 24 begins to maintain itself by receiving heat from the
The energization to is also terminated. Therefore, when preheating the vaporizer cylinder 21, only the heating part needs to be heated by the sheathed heater 24, and the preheating time is significantly shortened, and during normal combustion, heat is recovered from the combustion flame as before, efficiently. The temperature of the vaporizer cylinder 21 is maintained.

In the above embodiment, the sheathed heater 24 is embedded in the heating section 22, but the heating section 22 may be a heater itself such as a ceramic heater.

Effects of the Invention As described above, the present invention significantly shortens the preheating time of the carburetor and shortens the waiting time until the start of combustion. , running costs can also be reduced. Moreover, since the heat recovery section itself is brought into contact with and separated from the heating section by thermal expansion and contraction, no special member is required to make contact and separation with the heating section. It only needs to have a larger coefficient of thermal expansion, and has the advantage of being simple in structure and being able to be provided at low cost.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional liquid fuel combustion device, and FIG. 2 is a sectional view of a liquid fuel combustion device in an embodiment of the present invention. 21... Vaporization cylinder, 22... Heating section, 23... Heat recovery section, 24... Sheathed heater (heater), 35
...Ignition electrode (ignition means).

Claims (1)

[Scope of Claims] 1. A vaporizer tube that heats and vaporizes liquid fuel, a heater included in the vaporizer tube, and ignition means that ignites the heated and vaporized liquid fuel, and the vaporizer tube has a heat recovery section. and a heating section equipped with a heater, and the expansion coefficient of the heat recovery section is larger than the expansion coefficient of the heating section, and the heat recovery section and the heating section are positioned with a gap between them during non-combustion, and when combustion starts. After that, the heat recovery section thermally expands due to the heat received from the combustion flame.
A liquid fuel combustion device in which the heat recovery section and heating section are in close contact. 2. The liquid fuel combustion device according to claim 1, wherein the heating section is fitted into the heat recovery section.