JPS608605A - Liquid fuel combustion device - Google Patents

Abstract

PURPOSE:To perform gentle motion even during rapid control, to normally maintain excellent combustion properties, and to enlarge a practical combustion variable range, by a method wherein a variable means, such as dampers, which varies the area of a combustion gas passage, is held through the medium of a material having the high coefficient of thermal expansion. CONSTITUTION:A resistance plate 19, sized to be larger than a main combustion gas passage 17, is located above a partition 16, and a shaft 20, having the one end secured to the partition 19, is vertically movably mounted in a manner to extend through approximately the center of an inner flame cylinder 3. As a result, the disc-shaped resistance plate 19 varies the main combustion gas passage 17 from full opening to full closing, and an auxiliary combustion gas passage 18 is normally opened irrespective of the resistance plate 19. The upper part of a shaft 20 consists of a shaft 21 formed by a material (Zn, Al, etc.), having the high coefficient of thermal expansion, a material, such as bimetal type shape memory alloy, which is expandable due to a temperature change. The shaft 21, expanded by a high temperature during maximum combustion, is prevented from closing the main exhaust gas passage 17 even during rapid control of blockade of the main exhaust gas passage by means of the resistance plate 19.

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 structure and its problems Traditionally, wick burners were mainly used in kerosene stoves, etc.
The combustion noise is low, the structure is simple, and the operation is easy.

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 amount of air by changing the passage resistance by varying the cross-sectional area of the combustion scum passage flowing in the upper part of the combustion chamber with a damper, etc. controls the amount of combustion air as well as the amount of fuel evaporation. The amount of heat generated can be varied without significantly changing the air ratio. Therefore, the range in which the flame is maintained in the combustible range and good combustion is achieved with less flame lift and flashback has been widened to 1 to 1/2 of the combustion amount.

However, the rate of change in the amount of air due to the damper is faster than the rate of change in fuel. In other words, while the amount of air changes instantaneously depending on the opening degree of the damper, the amount of combustion depends mostly on temperature changes in the combustion chamber and the lamp wick, and changes little by little.
After a few minutes, it reaches an equilibrium state and becomes stable. Therefore, if the damper is changed suddenly, the fuel-air ratio will temporarily change significantly, causing a standing flame,
It generated an odor. For this reason, the combustion type variable width in actual use was set small.

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

Structure of the Invention The present invention maintains a variable means such as a damper that varies the combustion scum passage area through a material with a large coefficient of thermal expansion, so that the damper operates slowly even during sudden operations, and the combustion characteristics are always good. This is to expand the range of combustion variation in actual use.

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

In FIG. 1, a cylindrical lamp wick 1 has a lower part submerged in fuel 2, and an upper part of a cylindrical inner flame tube 3 and an outer flame tube 4, respectively.
It is exposed to the primary combustion chamber 5, which is composed of an inner cylinder 6 and a core guide cylinder 7, and is mounted so that it can move up and down through the gap formed by the inner cylinder 6 and the core guide cylinder 7 (the operating mechanism is not shown). A cylindrical porous tube 8 having an aperture ratio larger than that of the outer flame tube 4 is provided on the upper part of the outer flame tube 4, and the inner flame tube 3 and the porous tube 8 form two flames in the upper part of the flame combustion chamber 5. It constitutes the next combustion chamber 9. Inner flame tube 3
A transparent cylindrical tube 12 made of glass or the like is attached to the upper part of a cylindrical outer tube 11 which has a cross pin 10 passed therethrough substantially concentrically with the outer flame tube 4. A cap 14 is provided on the upper part of the inner flame cylinder 3 with a gap 13 in between, and a cylindrical incandescent body 15 is attached to the upper part of the cap 14.

A partition plate 16 attached to the top of the incandescent body 15 is in contact with the cylinder 12, and has a main combustion gas passage 17 with a large opening in the center and an auxiliary combustion gas passage 18 with many small holes uniformly provided around the periphery.
has. A resistance plate 19 larger in size than the main combustion scum passageway 17 is provided on the upper part of the partition plate 16, and a shaft 20 with one end fixed to the resistance plate 19 is provided so as to be movable up and down passing through approximately the center of the inner flame cylinder 3. It is. Therefore, the disc-shaped resistance plate 19 changes between fully opening and completely closing the main combustion gas passage 17, and the auxiliary combustion gas passage 18 is always open regardless of the resistance plate 19. In addition, the upper part of the shaft 2o is made of a material with a large coefficient of linear expansion (Zn, A#, etc.), bimetal, shape memory alloy, etc.
It has +1q1121 made of a material that expands and contracts with temperature changes.

Next, the operation will be explained.

Fuel 2 passes through the lamp wick 1 and is sucked up to its tip by capillary action. When the lamp wick 1 sufficiently soaked with fuel is ignited, a large ignition occurs at the tip of the lamp wick 1 and combustion begins. High-temperature gas due to combustion enters the primary combustion chamber 5, the secondary combustion chamber 9,
Main combustion gas passage 17 and auxiliary combustion gas passage 1 of partition plate 16
8 , the air that generates a thermal draft and is necessary for combustion flows in through the holes in the inner flame tube 3 and outer flame tube 4 , the holes in the porous tube 8 , and the gap 13 . The evaporation of the fuel increases as the amount of air flowing in through the holes in the inner flame tube 3 and the outer flame tube 4 increases, and as the heat of combustion increases. Combustion occurs by forming a flame-holding secondary flame. Stomatal combustion supplies the wick with the heat of vaporization of the fuel. -Fire combustion chamber 5
When the pressure (thermal draft) changes, the amount of air flowing in through the holes increases or decreases, and the amount of combustion in the pore 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 combustion chamber 5. Further, a porous cylinder 8 is provided on the upper surface of the fuel gas rising due to the air flowing in from the gap 13.
An air layer is formed towards the Therefore, the fuel concentration decreases rapidly, and the combustion rate also decreases rapidly. Therefore, even if the speed of the fuel dregs changes by 9 m degrees, there is a corresponding combustion speed condition, and the secondary flame formed in this layer can stably complete combustion against lift and back, which causes odor.

No unburned gas such as CO is generated. Further, the porous cylinder 8 and the red-hot cylinder 15 become red-hot due to the high-temperature gas in the secondary combustion chamber 9, and the heat is radiated through the transparent cylinder 12. When the l1ill 2 Q is moved up and down (the release, operation knob, etc. connected to the shaft 2o are not shown), the shaft 21 in contact with the upper part and the resistance plate 19 attached to this shaft 21 move up and down. When the resistance plate 19 rises, the main combustion scum passage 17 opens, and when the resistance plate 19 descends, the main combustion scum passage 17 gradually reduces its opening area and is finally closed. Therefore, the combustion scum passage changes from the area of the auxiliary combustion gas passage 18 to the sum of the auxiliary combustion gas passage 18 and the main combustion scum passage 17 due to the upper and lower positions of the resistance plate 19, and the combustion The gas flow rate (-air amount) is determined. The maximum amount of combustion can be determined by the sum of the areas of the main and auxiliary combustion gas passages 17,18. The reduction in the amount of combustion is caused by reducing the area of the auxiliary combustion waste passage, increasing the passage resistance and reducing the amount of air flowing into the combustion chamber, thereby reducing the amount of fuel evaporation. greater than the rate of decrease in combustion amount. Therefore, if the combustion amount is suddenly changed from the maximum combustion amount to the minimum combustion amount, the air amount will decrease faster than the fuel, so the fuel-air ratio will temporarily increase and unburned gas, soot, and odor will be generated. Axis 2 at the top
1 allows for gentle damper operation even in response to sudden operations. That is, the temperature of the combustion gas is a maximum temperature of 500° C. when the combustion is at its maximum, and a low temperature of 350° C. when the amount of combustion is the minimum. Furthermore, when the main combustion gas passage 17 is blocked, the flow of combustion gas becomes a pool around the shaft 21. Since the shaft 21 is made of a material with a large coefficient of thermal expansion, the shaft 21, which expands at a high temperature during maximum combustion, allows the resistance plate 19 to remain in the main exhaust gas passage even when the resistance plate 19 suddenly closes the main exhaust gas passage. A slight gap is provided without blocking the shaft 21, and as the exhaust gas temperature gradually decreases, the length of the shaft 21 becomes shorter until it finally closes, resulting in the lowest combustion state.

Therefore, the combustion amount always changes gradually, and stable combustion can be maintained. Note that a in Figure 2,
b shows the combustion amount and Co/C02g of one embodiment of the present invention, and c and d show the conventional combustion amount and change in C○/co2.

Effects of the Invention The present invention improves the combustion characteristics during active operation by holding the variable means for varying the combustion gas passage area through a material with a large coefficient of thermal expansion. ,
It prevents the generation of odors and makes it comfortable and safe. As a result, the range of practical use for good combustion is expanded, the variable range of combustion is expanded, controllability against heating loads is improved, and comfort and energy saving are improved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 2 is a characteristic diagram showing combustion characteristics of the embodiment of the present invention and a conventional example. 3... Inner flame tube, 4... Outer flame tube, 5...
...-Next combustion chamber, 19...Resistance plate. Name of agent: Patent attorney Toshio Nakao and 1 other person - Rihi

Claims (1)

[Claims] A combustion chamber consisting of an inner flame tube and an outer flame tube having porous holes, a lamp wick whose tip is located in the combustion chamber at least during combustion, and variable means for varying the combustion gas passage area in the upper part of the combustion chamber, Liquid twisting in which the variable means is held through a material with a large coefficient of thermal expansion1. fuel combustion equipment.