JPS608606A - Liquid fuel combustion device - Google Patents

Abstract

PURPOSE:To increase the variable range of a combustion amount through guidance of combustion gas to below and change of the strength of heat draft in a combustion chamber, by a method wherein the upper part of a combustion chamber is covered at a distance of a gap, the top is almost closed, and a vertically movable resistance cylinder is mounted. CONSTITUTION:The upper part of a cylinder 15 is covered at a distance of a gap 20, pores 21 are provided in the top to almost close it, and a vertically movable resistance cylinder 22 is provided. The resistance cylinder 22 is connected to a shaft 23, and this causes the cylinder to be constituted so that it is vertically movably controllable. Reverse draft, produced due to the height of an outlet part 24 of the resistance cylinder 22 and the height of a stationary plate 19, is varied through vertical movement of the resistance cylinder 22. A method of guiding downward combustion gas by means of the resistance cylinder 22 causes high temperature gas to form a downward flow, and thereby the flow is agitated, resulting in improvement of the mixing ability of combustion gas. This prevents formation of a rise flame, and enlarges a variable range of a calorific value in which combustion is uniformly completed, and the offensive smell and smoke of unburnt gas are prevented from production. Further the stability of flame is improved better.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a liquid fuel combustion device widely used for heating, cooking, etc. in general households.

Conventional configurations and their problems A wick burner mainly used in kerosene stoves and the like produces low combustion noise, has a simple configuration, and is easy to operate. The amount of heat generated by a wick burner can be varied by moving the wick "uniformly" to change the evaporation area of the fuel, and by varying the amount of air that flows in near the wick, thereby adjusting the temperature and fuel vapor pressure, which are the conditions for fuel evaporation. There are ways to change. The method of varying the air amount by changing the passage resistance by varying the cross-sectional area of the combustion gas passage flowing in the upper part of the combustion chamber controls the combustion air as well as the amount of fuel evaporation. The amount of heat generated can be varied without making large changes. Therefore, the range where the flame is maintained in the flammable range and where flame lift and flashbank are less likely to occur is within the range of 1 to 1 of the combustion amount.
/2. The resistance plate that changes the cross-sectional area of the combustion gas passage and changes the passage resistance iiJ has a shaft 2 rotatably installed perpendicular to the passage 1 as shown in FIG.
The fluid resistance of the passage 1 is riJ by the angle of the resistance plate 3 of J order.
There was a way to do it. However, since the flowing combustion gas is at a high temperature, the passage area changed by the resistance plate 3 changes due to thermal expansion of the movable part and dimensional margin, and it is difficult to set it to a constant value over a long period of time. Therefore, the operational range for actual use was set to be smaller than the good combustion range. In addition, if the resistance plate 3 that changes the opening degree is operated incorrectly, the shaft 2 is misaligned, or the stopper (not shown) is defective, the combustion gas passage may become extremely narrow, and at this time, the combustion may not be good. The combustion range was exceeded, resulting in an extreme lack of air and a dangerous odor of unburned gas.

OBJECTS OF THE INVENTION An object of the present invention is to widen the variable range of combustion amount and improve combustion characteristics.

Structure of the Invention The present invention covers the upper part of the combustion chamber with a gap, almost blocks the upper part, and provides a vertically movable resistance cylinder to guide the combustion gas downward and reduce the heat draft generated in the combustion chamber. By changing the strength, the variable range of combustion amount is expanded.

Description of examples An embodiment of the present invention will be described below based on the drawings.

In FIG. 2, the cylindrical lamp wick 4 has its lower part submerged in the fuel 5, and its upper parts each having a cylindrical inner flame tube 6 and an outer flame tube 7.
It is exposed to the primary combustion chamber 8 composed of
The operating mechanism is not shown). A cylindrical porous tube 11 having an aperture ratio larger than that of the outer flame tube 7 is provided at the upper part of the outer flame tube 7, and the inner flame tube 6 and the porous tube 11 form a second combustion chamber in the upper part of the secondary combustion chamber 8. It constitutes a secondary combustion chamber 12. Almost the same as the inner flame tube 6 and the outer flame tube 7, cross pin 13 in a wedge shape.
A transparent cylindrical tube 15 made of glass or the like is attached to the upper part of the cylindrical outer tube 14 which is provided through the tube. A cap 17 is attached to the two parts of the inner flame cylinder 6 with a gap 16 in between.
A cylindrical incandescent body 18 is mounted on the top of the cap 17. At the top of the red-hot body 18, there is a
The j-shaped fixing plate 19 is in contact with the cylinder 15 at its periphery. Quotient 15
The upper part of the is covered with a gap 20, and a small hole 21 is provided in the second part to form a resistance cylinder 22 that is almost closed and movable up and down.This resistance cylinder 22 is connected to a shaft 23, and The movement operation is freely configured.

Next, the operation will be explained.

The fuel 5 passes through the wick 4 and is sucked up to its tip by capillary action. When the lamp wick 4 sufficiently soaked with the fuel 5 is ignited, a large ignition gap is generated at the tip of the lamp wick 4 and combustion begins. High-temperature gas from combustion enters the primary combustion chamber 8 and the secondary combustion chamber 1.
2, the air necessary for combustion generates a thermal draft and flows in through the holes in the inner flame tube 6, the outer flame tube 7, the holes in the porous tube 11, and the gap 16. The fuel evaporates through the inner flame tube 6 and the outer flame tube 7.
The flame increases with the increase in the amount of air flowing in through the holes and the increase in combustion heat, and the flame burns in the holes, causing the flame to burn in the gaps 16 and 16.
A secondary flame is formed which is held flame-stabilized by the porous cylinder 11, and combustion is performed. The stomatal combustion supplies the lamp wick 4 with the heat of vaporization of the fuel. - When the pressure (thermal draft) in the secondary combustion chamber 8 changes, the amount of air flowing in through the holes increases or decreases, and the combustion in the stoma combustion section changes, so the amount of fuel evaporation also changes. That is, the amount of combustion varies depending on the amount of air flowing into the secondary combustion chamber 8. Also, the gap 16
An air layer is formed on the upper surface of the rising fuel gas toward the porous cylinder 18 due to the inflowing air. Therefore, the fuel concentration decreases rapidly, and the combustion rate also decreases rapidly. Therefore, even if the speed and concentration of the fuel gas changes, there is a corresponding combustion speed condition, and the secondary flame formed in this layer is stabilized by lifting and backing, and combustion can be completed, thereby eliminating odor. No unburned gas such as CO is generated. Further, the porous cylinder 11 and the red-hot cylinder 18 become red-hot due to the high-temperature gas in the secondary combustion chamber 12, and the heat is radiated through the transparent cylinder 16. When the shaft 23 is moved up and down (the release, operation knob, etc. connected to the shaft 23 are not shown), the resistance cylinder 22 attached to this shaft 23 is moved up and down. When the resistance tube 22 rises, the gap between the resistance tube 22 and the fixed plate 19 expands, and the gas outlet portion 24 of the resistance tube 22 expands.
When the position of the resistor cylinder 22 becomes close to the fixed plate 19 and the resistance cylinder 22 is lowered, the gap between the resistance cylinder 22 and the fixed plate 19 narrows, and the resistance cylinder 2
The position of the second gas outlet portion 24 is lower than the fixed plate 19.

Therefore, depending on the upper and lower positions of the resistance tube 21, the gap area between the resistance tube 22 and the fixed plate 190 changes, and the passage of the combustion gas changes depending on the upper and lower positions of the resistance tube 21.
The heights of the outlet portion 24 and the fixing plate 19 change. As a result, the amount of combustion gas and air change due to passage resistance and reverse heat draft.

That is, the height of the outlet portion 24 of the resistance cylinder 22 and the fixed plate 19
The reverse draft due to the height of the resistor tube 22 can be changed by changing the height of the resistor tube 22. Further, in the method of guiding the combustion gas downward using the resistor cylinder 22, the high temperature gas flows downward, so the flow is agitated and the mixing property of the combustion gas is improved. Therefore, combustion is completed uniformly without producing a standing flame, and the variable range of calorific value is widened without producing unburned gas odor or smoke. The downward flow of the combustion gas still improves flame stability because the combustion gas is cooled less and the combustion rate is maintained, the gas concentration is uniform, and mixing with the outside air (near the outlet 24 of the resistance cylinder 22) is promoted.

Since the reverse heat draft is determined by the outlet portion 24 and the fixed plate 19, if the diameter of the resistance tube 21 is set to be sufficiently large with respect to the tube 15, the influence of dimensional accuracy such as eccentricity will be very small. The holes 21 are provided to disperse combustion gas and to maintain a minimum opening in the event of an abnormality (such as when the resistance tube 22 covers the tube 15). Since the surface of the resistance tube 22 is in sufficient contact with the combustion gas and is at high temperature, a part or the entire surface of the resistance tube 22 is coated with PT.
, Ag, Pd, V2O5, Al2O3,5i02,
When a metal catalyst such as Cu or Ni is attached, purification of exhaust gas is enhanced, and odor, Co, and NOx can be reduced. Resistor tube 2
Since the temperature of resistor cylinder 22 is high, the radiation efficiency is increased, and if the shape of the cylinder part is made into a tapered shape, the exit area of the combustion gas can be varied by adjusting the top and bottom of the resistance cylinder 22.

Effects of the Invention By covering the upper part of the combustion chamber and providing a vertically movable resistance cylinder, the present invention expands the range of good combustion, expands the variable range of combustion amount, and improves controllability against loads. Improved comfort and energy saving/L? The energy level is increased. In addition, since the mixing of combustion gas is promoted, the radiation efficiency can be improved without causing flames, odors, etc.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view showing a conventional example, and FIG. 2 is a vertical sectional view showing an embodiment of the present invention. 6... Inner flame tube, 7... Outer flame tube, 8...
...-Secondary combustion chamber, 12...Secondary combustion chamber, 2o
...Gap, 22...Resistance plate. Name of agent Toshio Nakao, lawyer and 1 other person 1st
figure

Claims (3)

[Claims] (1) A liquid fuel combustion device in which a combustion chamber is formed by an inner flame cylinder and an outer flame cylinder having porous holes, the upper part of the combustion chamber is covered with a gap, and a resistance cylinder is provided which is movable up and down. (2) A liquid fuel combustion device according to claim 1, in which a metal catalyst is attached to a part or the entire surface of the inside or outside of the resistance cylinder; (3) The liquid fuel combustion device according to claim 1, wherein the area of the combustion gas passage is varied by adjusting the upper and lower sides of the resistance cylinder.