JPS59131806A - Liquid fuel burner - Google Patents

Abstract

PURPOSE:To make it possible to set the air quantity with a high precision and enlarge the variable range of the combustion quantity by providing dampers at the inlet part for introducing air flowing into the burner from an inner flame cylinder and an outer flame cylinder and changing the opening area of the dampers by the rotation of the inner and outer cylinders. CONSTITUTION:The control for changing air quantity is determined by the configuration of opening prts 21, 22 and 25, 26. Since the quantity of air flowing into the burner from the side of the inner flame cylinder 6 and the quantity of air flowing thereinto from the side of the outer flame cylinder 7 are simultaneously controlled, the combustion condition is not deviated and rising and pulsation of yellow flame are difficult to occur. At the same time, the quantity of combustion increases or decreases responsive to the air quantity. The quantity of combustion becomes maximum when dampers 19, 20, 23 and 24 assume maximum opening area, and the quantity of combustion decreases in correspondence to the decrease in the opening area of the dampers 19, 20, 23 and 24. The combustion quantity becomes minimum when only holes 27 and 28 having minimum area are open. Since the dampers 19, 20, 23 and 24 are mounted on the combustion air inlet part, their temperatures are relatively low during the ordinary combustion. Further, since the openings 21 and 22 or the opening 25 and 26 are respectively in tight contact with each other, the dimensional precision can be easily controlled, and the variable range of the quantity of combustion can be enlarged.

Description

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

Conventional Structure and Problems Conventionally, the wick paper pager, which has been mainly used in kerosene stoves, produces low combustion noise, has a simple structure, and is easy to operate. The calorific value of the wick burner can be varied by moving the wick up and down to change the area of fuel evaporation, and by varying the amount of air that flows near the wick to change the temperature and fuel vapor pressure, which are the conditions for fuel evaporation. There is a way to do it. The method of varying the passage 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, making it possible to vary the amount of heat generated without making a large change in the fuel-air ratio. Therefore, the range in which the flame is maintained in the combustible range and where flame lift and flash pack are less likely to occur and good combustion is achieved has been widened to 1 to 1/2 of the combustion amount.

The damper, which changes the cross-sectional area of the combustion gas passage and varies the amount of air by passage resistance, is provided at the combustion chamber inlet and outlet. The configuration in which a resistance plate is provided at the inlet of the combustion chamber makes it difficult to link the inlets on the inner and outer flame cylinder sides, and
The method of providing a damper only on one side of the outer flame tube makes the combustion at the lower part of the inner and outer flame tubes unevenly unstable due to the change in air volume caused by the damper. 3. There is a method in which a shaft 2 is rotatably provided perpendicular to the page path 1, and the flow resistance of the path 1 is varied by adjusting the angle of a damper 3 attached to the shaft 2. However, since the flowing combustion gas is at a high temperature, the passage area changed by the damper 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 smaller than the good combustion range. In addition, if the damper 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. The range was exceeded, resulting in an extreme lack of air and a dangerous odor of unburned gas.

purpose of invention An object of the present invention is to expand the combustion amount variable range.

Structure of the Invention The present invention provides a damper at the inlet of air flowing into the inner and outer flame tubes, and changes the opening area of the damper by rotating the inner and outer flame tubes, thereby controlling the air flow with high precision. This makes it possible to set the amount of combustion, expanding the variable range of combustion amount.

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

In FIG. 2, the lower part of the cylindrical lamp wick 4 is submerged in the fuel 6, and the upper part thereof is 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 1 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.
1 is provided, and the inner flame cylinder 6 and the porous cylinder 11 constitute a secondary combustion chamber 12 above the negative combustion chamber 8.

Inner flame cylinder 6. A transparent cylindrical tube 16 made of glass or the like is attached to the upper part of a cylindrical outer tube 14 which is provided approximately concentrically with the outer flame tube 7 with a cross pin 13 passing through it.

A cab 17 is provided in the second part of the inner flame cylinder 6 with a gap 16 in between, and a cylindrical incandescent body 18 is attached to the upper part of the cab 17. A disc-shaped damper 19 is attached to the lower part of the inner flame cylinder 6, and the damper 6 is attached so as to be in close contact with this damper 19.
The page damper 20 is provided on the upper part of the inner cylinder 9. The damper 19 and the damper 2o are each provided with openings 21 and 22. When the inner flame cylinder 6 rotates, the area constituted by the dampers 19 and 20 changes. Similarly, the damper 23 is attached to the lower part of the outer cylinder 14, and the damper 23 is placed in close contact with the damper 23.
4 is provided at the top of the core guide cylinder 1°, and the dampers 23, 24 are each provided with openings 25, 26, so that the area constituted by the dampers 23, 24 changes according to the rotation of the outer cylinder 14. Outer cylinder 1
4 and the inner flame tube 6 are fixed with a cross pin 13, so the amount of air entering from the inner flame tube 6 is controlled using dampers 19 and 20.
The amount of air entering from the outer flame tube 7 can be varied simultaneously using the dampers 23, 24, and the dampers 19, 2, and 23.
24, the opening at the minimum passage area is set by holes 27 and 28 provided on one side of the damper.

Next, the operation will be explained. Fuel 5 passes through the lamp wick 3 and is sucked up to its tip by capillary action. When the lamp wick 3 sufficiently soaked with fuel is ignited, an ignition angle of 6 beams is generated at the tip of the lamp wick 3, and combustion begins. High-temperature gas from combustion enters the primary combustion chamber8. By passing through the secondary combustion chamber 12, a thermal draft is generated and the air necessary for combustion flows through the openings 21, 22 and 25.2.
6. Inner flame cylinder 6. A hole in the outer flame tube 7 and a hole in the porous tube 11,
It flows in from the gap 16. The fuel evaporates through the inner flame tube 6 and the outer flame tube 7.
The flame increases as the amount of air flowing in from the hole increases and the heat of combustion increases, and the flame burns in the hole and burns in the gap 16.
A secondary flame is formed which is held flame-stabilized by the porous cylinder 11, and combustion is performed.

Stomatal combustion supplies the wick with the heat of vaporization of the fuel. - When the pressure (thermal draft) in the combustion chamber 8 changes, the amount of air flowing in through the holes increases or decreases, and the amount of combustion in the combustion chamber 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 negative combustion chamber 8. Furthermore, an air layer is formed on the upper surface of the rising fuel gas toward the porous cylinder 18 due to the air flowing in through the gap 16. Therefore, the fuel concentration decreases rapidly and the combustion speed also decreases rapidly. Therefore, even if the speed and degree of the fuel gas change, there will be combustion speed conditions that correspond to the changes, and the flame formed in this layer can complete combustion stably against lift and back, thereby eliminating odor. No unburned gas such as 00 is generated. ! ,
In addition, 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. If you hold the handle (not shown) and rotate the entire chimney,
The damper plate 19 attached to the inner flame tube 6 and the damper plate 23 attached to the outer tube 14 rotate, and the inner flame tube 6. The passage area of the air flowing into the outer flame tube 7 changes, and the amount of air passing through increases or decreases. Control of the change in air volume is through openings 21, 22 and 2.
6.26 is determined by the hole shape, and the amount of air flowing in from the inner flame tube 6 side and the air amount flowing in from the outer flame tube 7 side are simultaneously controlled, so the combustion state is not biased and the yellow flame rises and pulsates. It's hard to wake up. At the same time, the amount of combustion increases or decreases depending on the amount of air, and the amount of combustion reaches its maximum when the dampers 19, 20° 23.24 have the maximum opening area, which corresponds to the decrease in the opening area of the dampers 19, 20, 23.24. ○Damper 1
9, 20 and the dampers 23, 24 are installed at the combustion air inlet, so the temperature is relatively low during normal combustion, and the openings 21 and 22 or the openings 26 and 26 are concentrically close to each other. Dimensional accuracy can be easily managed, and the combustion amount variable range can be expanded. Furthermore, when the combustion amount is suddenly increased or decreased, the change in the amount of fuel evaporation lags behind the change in the amount of air. As a result, the air-fuel ratio temporarily increases or decreases sharply, causing lift and fluctuation in the flame.

Particularly when the amount of air is reduced rapidly, it results in excess fuel, which causes yellow flames, unburned gas, and odor, which is unpleasant or dangerous.However, by increasing or decreasing the amount of air at the entrance of the combustion chamber, the amount of air can be Although it is restricted at the inlet, the combustion gas is quickly discharged from the exhaust port that opens at the top of the combustion chamber, so the fuel evaporation rate improves responsiveness to changes in air volume, making it easier to discharge the combustion gas. The flammability is improved, the combustion range is expanded, and yellow flames are produced.
It can be used with peace of mind as it significantly reduces the generation of unburned gas and does not cause unpleasant sensations such as odor.

Effects of the Invention The present invention has a structure in which a damper is provided at the mouth of the air inlet between the inner and outer flame tubes, and the opening area of the damper is changed by rotation of the inner and outer flame tubes. It is possible to set the air volume with high precision, expanding the range of variable combustion volume, improving comfort and energy savings. In addition, by providing the damper in close contact with the low-temperature area, it is possible to prevent deformation and
It does not cause expansion, has a simple structure, is durable, highly reliable, and has high safety.

[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. 4...Light wick, 6...Inner flame tube, 7...
...Outer flame cylinder, 19...Damper, 2o...
...Damper, 23...Damper, 24...
·damper. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 figure

Claims (2)

[Claims] (1) A combustion chamber such as an inner flame tube and an outer flame tube having porous holes,
A lamp wick whose tip is located in the combustion chamber during combustion, and a damper is provided at the inlet of air flowing into the inner flame tube and the outer flame tube, so that the inner flame tube and the outer flame tube rotate. A liquid fuel combustion device configured to change the opening area of a damper. (2) The liquid fuel combustion device 0 according to claim 1, wherein the damper portion is provided with a minimum passage hole that is always open.