JPS6132567B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid fuel combustion device, and particularly to a radiant incandescent body thereof, and an object of the present invention is to provide a configuration that has less thermal influence on the vaporizing wick and can effectively extract radiant heat. .

Recently, as shown in FIG. 5, a vaporizing wick 22 containing fuel in a liquid phase is provided at the bottom of the burner 21, and air holes 23 are formed in the burner wall near the vaporizing wick.
The combustion chamber 2 is connected above the burner 21, and the amount of fuel vaporized is adjusted by the amount of air supplied from the combustion chamber 2.
4, a liquid fuel combustion device using a blue flame combustion method has been put into practical use and is attracting attention.

However, the combustion chamber 24 of this liquid fuel combustion device is provided with an incandescent body 25 having a large heat capacity, such as a wire mesh or a perforated metal plate, and this incandescent body 25 is heated most efficiently by the vaporizing wick 2.
2, the radiant heat to the vaporizing wick 22 increases significantly, causing a fuel boiling phenomenon regardless of the amount of supplied air, resulting in so-called runaway combustion in which the amount of fuel vaporized increases significantly. Furthermore, when the burner is tilted to facilitate the replacement of the vaporizing wick and to directly view the combustion flame, the flame and exhaust gas flow in substantially the same direction as the tilt direction since the air flow rate is large during strong combustion. However, during weak combustion, the air amount and flow velocity become small, and the
Since the exhaust vector in the vertical direction becomes dominant, the flame and exhaust gas flow approximately vertically, and for this reason, it is difficult to maintain constant heating even if a red-hot body is provided.

The present invention is intended to eliminate the above-mentioned drawbacks, and one embodiment thereof will be described below using an oil heater with reference to the accompanying drawings.

In FIGS. 1 and 2, 1 is a combustor main body, which is equipped with a burner 2 inside. The lower part of the burner 2 is a vaporizing chamber 3, and the upper part of the burner 2 is connected to a combustion chamber 4. Vaporization chamber 3 and combustion chamber 4
A large number of air holes 3a, 4a are provided in the burner wall facing toward the burner. The tip of a vaporizing wick 5 made of a silica-alumina porous material is exposed in the vaporizing chamber 3, and kerosene is supplied to this vaporizing wick 5 through an oil feed pipe 6. 7 is a burner case that guides air supplied from the blower pipe 8 to air holes 3a and 4a. Note that a damper 8a is provided in the air path leading to the blow pipe 8 as an air amount adjusting means. 9
10 is a heat exchanger, 11 is a convection fan that circulates indoor air and supplies hot air, and 12 is an ignition heater. Here, in the combustion chamber 4, an incandescent body 13 made of a lath net is provided at an angle of θ ₂ .
This angle θ ₂ is greater than the inclination angle θ ₁ of the burner 2 .

In the above configuration, if the amount of air supplied to the burner 2 from the blast pipe 8 is increased by adjusting the damper 8a, the amount of air entering through the vaporizing air hole 3a will inevitably increase, and the amount of air flowing from the vaporizing wick 5 will increase. The amount of kerosene vaporized increases, and at the same time, the amount of air entering from the combustion air hole 4a also increases, resulting in strong combustion. At this time, as shown in FIG. 3A, the flame and high-temperature exhaust gas flow in substantially the same direction as the inclination angle _θ1 of the burner 2, heating the upper part of the incandescent body 13 provided in the combustion chamber 4, and heating the heating area. Form K. Furthermore, if the amount of supplied air is reduced by adjusting the damper 8a, the flame will become smaller and the vector in the angle θ ₁ direction will also become smaller, making the exhaust vector in the vertical direction dominant, as shown in Figure 3B. The lower part of the incandescent body 13 is made red hot to form a heating area K'. The radiant heat from the red-hot body 13 thus heated is extracted forward through the radiant window 9 and used as radiant heating.

Incidentally, the incandescent body 13 is constructed of a lath net, and its heat capacity is smaller than that of porcelain or the like, and since the upper part of the incandescent body 13 becomes red hot during strong combustion, the radiant heat is attenuated in inverse proportion to the square of the distance. vaporizer wick 5
The impact on the environment is sufficiently reduced. On the other hand, during weak combustion, the inclination angle _θ of burner 2 is
Since the lower part of 3 is made red hot, almost no radiant heat is radiated to the vaporizing core 5.

Further, since the red-hot body 13 uses a lath mesh, the exhaust gas is quickly discharged without obstructing the flow of the exhaust gas. Therefore, flame turbulence due to pressure loss, turbulence, etc. in the combustion chamber 4 is not caused. This incandescent body 13 is a lath mesh shown in Figure 4a, a wire mesh shown in Figure 4b, and a wire mesh shown in Figure 4c.
A similar effect can be obtained by using the punched metal shown in (d) or the foamed metal shown in (d) in the same figure.

Furthermore, this red-hot body 13 is located in a range where it can always generate red heat even in the strong combustion channel where the flame and high-temperature exhaust gas reach for a long time, and in the weak combustion channel where the flame and high-temperature exhaust gas reach for a short time, so that it is effective over the entire combustion region. Radiant heating can be done efficiently and without any negative effects.

As described above, in the present invention, since the incandescent body is provided above the tilted burner at an angle greater than the inclination angle, stable heat radiation can be obtained over the entire combustion range, and the combustion condition may not be deteriorated. I won't let you.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a liquid fuel combustion device according to an embodiment of the present invention, FIGS. 2 and 3 A and B are enlarged sectional views of the main parts thereof, and FIGS. FIG. 5 is a front view showing an example, and FIG. 5 is a sectional view showing a conventional example. 1... Combustion device main body, 2... Burner, 3... Vaporization chamber, 4... Combustion chamber, 5... Vaporization wick, 9... Transparent window, 13... Red-heating body.

Claims (1)

[Scope of Claims] 1. A burner having a large number of air holes in its side wall and housing a vaporizing wick made of a heat-resistant porous material containing fuel in a liquid phase inside, and a burner connected above the burner. a combustion chamber, and an air amount adjusting means for adjusting the amount of air supplied to the vicinity of the vaporizing core and to the combustion chamber, the burner is inclined at an angle of θ ₁ with respect to the perpendicular line, and the burner of the combustion chamber is A see-through window is provided on the wall surface in the inclined direction, and a red-hot body is provided in the combustion chamber at an angle of θ ₂ in substantially the same direction as the inclination direction of the burner, and the angle θ ₂ is larger than the angle θ ₁ . A liquid fuel combustion device characterized by: 2. The liquid fuel combustion device according to claim 1, wherein the incandescent body is made of wire mesh, punched metal, lath mesh, or foamed metal.