JPS643931Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a liquid fuel combustion device used for home heating, cooking, etc., and the combustion amount is controlled within a certain range by setting the passage resistance of exhaust gas flowing through the combustion chamber to a certain value. It can be set within

Conventionally, wick burners mainly used in kerosene stoves and the like have low combustion noise, are simple in structure, and 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 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 flame is maintained in the flammable region,
The range in which flame lift and flashback are less likely to occur and good combustion is achieved has been widened to 1 to 1/2 of the combustion amount. The resistance plate that changes the cross-sectional area of the combustion gas passage and varies the passage resistance is provided with a rotatable shaft 2 perpendicular to the passage 1, as shown in FIG. There is a way to vary the flow resistance of passage 1. 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 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 in this case, combustion may not be good. The combustion range was exceeded, resulting in an extreme lack of air and a dangerous odor of unburned gas.

The present invention is a main combustion gas gas passage provided with a resistance plate that moves the distance between a combustion gas passage provided in the upper part of the combustion chamber and an opening that continuously changes the combustion gas passage area at the outlet of this combustion gas passage. By providing an auxiliary combustion gas passage with a constant area open in parallel with the passage, the flow resistance of the combustion gas passage can be kept above a certain value (always partially open), thereby reducing the combustion amount to the lower limit for good combustion. It is to be maintained above.

An embodiment of the present invention will be described below based on the drawings. In Figure 2, the lower part of the lamp wick 4 is connected to the fuel 5.
The upper part is exposed to the primary combustion chamber 8 composed of the inner flame tube 6 and the outer flame tube 7, and it moves up and down in the gap formed by the inner flame tube 9 and the core guide tube 10. (The operating mechanism is not shown). A porous tube 11 having a larger opening ratio than the outer flame tube 7 is provided above the outer flame tube 7, and the inner flame tube 6 and the porous tube 11 create a secondary combustion chamber 12 in the upper part of the primary combustion chamber 8. It consists of A transparent cylinder 15 made of glass or the like is attached to the upper part of an outer cylinder 14 which has a cross pin 13 passed through it almost concentrically with the inner flame cylinder 6 and the outer flame cylinder 7. A cap 17 is provided at the upper part of the inner flame cylinder 6 with a gap 16 in between, and a combustion gas passage having a red-hot body 18 is attached to the upper part of the cap 17. A partition plate 19 attached to the upper part of the combustion gas passage is in contact with the cylinder 15, and has a main combustion gas passage 20 having a large opening in the center and an auxiliary combustion gas passage 21 having a large number of uniformly small holes around the periphery. A resistance plate 22 larger in size than the main combustion gas passage 20 is provided on the upper part of the partition plate 19, and a shaft 23 with one end fixed to the resistance plate 22 is provided so as to be movable up and down passing through approximately the center of the inner flame tube 6. There is. Therefore, the resistance plate 22 continuously changes the main combustion gas passage 20 from fully open to fully closed, and the auxiliary combustion gas passage 2
1 is always open regardless of the resistance plate 22.

Next, the operation will be explained.

The 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 circle is generated at the tip of the lamp wick 3 and combustion begins. High-temperature gas from combustion passes through the primary combustion chamber 8 , the secondary combustion chamber 12 , the main combustion gas passage 20 of the partition plate 19 , and the auxiliary combustion gas passage 21 , creating a thermal draft and air necessary for combustion flowing into the inner flame tube 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 evaporation of the fuel increases as the amount of air flowing in through the holes in the inner flame tube 6 and the outer flame tube 7 increases, and the combustion heat increases. Combustion occurs by forming a secondary flame. Stomatal combustion supplies the wick with the heat of vaporization of the fuel. When the pressure (thermal draft) in the primary combustion chamber 8 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 primary 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 rate also decreases rapidly. Therefore, the velocity of fuel gas,
Even when the concentration changes, there is a corresponding combustion rate condition, and the secondary flame formed in this layer is lifted,
Since combustion can be completed stably against backlash, odor and unburned gas such as CO are not generated. Also,
The porous tube 11 and the incandescent body 18 become red hot due to the high temperature gas in the secondary combustion chamber 12, and the heat is radiated through the transparent tube 15. When the shaft 24 is moved up and down (the release, operating knob, etc. connected to the shaft 24 are not shown), the shaft 23 in contact with the upper part and the resistance plate 22 attached to this shaft 23 move up and down. When the resistance plate 22 rises, the main combustion gas passage 20 opens, and when the resistance plate 22 falls, the opening area of the main combustion gas passage 20 gradually decreases and is finally closed. Therefore, the combustion gas passage is divided into the auxiliary combustion gas passage 2 by the upper and lower parts of the resistance plate 22.
1 to the area of the sum of the auxiliary combustion gas passage 21 and the main combustion gas passage 20, and the combustion gas flow rate (=air amount) is determined according to the flow resistance of this change. Therefore, the combustion amount is maximum when the main combustion gas passage 20 is fully opened, and when the combustion amount decreases due to the lowering of the resistance plate 22 and the main combustion gas passage 20 is blocked,
The only combustion gas passage is the auxiliary combustion gas passage 21, and the amount of combustion is minimized. Therefore, the maximum amount of combustion,
Since the minimum can be determined by the opening area of the main combustion gas passage 20 and the auxiliary combustion gas passage 21, it is possible to accurately set the combustion amount by considering the dimensional accuracy of the holes. The auxiliary combustion gas passage 21 is connected to a resistance plate 22.
Since it is always open regardless of the combustion rate, the combustion amount will never fall below the set value, and there is no risk of flame lift due to lack of air and the generation of gas. Furthermore, if the auxiliary combustion gas passage 21 is provided around the main combustion gas passage 20 with a uniform opening area like many holes, the flow of combustion gas will be similar regardless of whether the resistance plate 22 is above or below. As a result, complete combustion can be achieved without causing insufficient mixing or lift due to uneven flame distribution. Further, in this embodiment, the auxiliary combustion gas passage 21 is provided outside the main combustion gas passage 20, but the resistance plate 2
A similar effect can be obtained by cutting out a part of 2 and using this as an auxiliary combustion gas passage, and in this case, the combustion gas passage becomes more compact.

As described above, according to the present invention, the combustion gas passage is
The main combustion gas passage, which changes the area of the combustion gas passage, and the auxiliary combustion gas passage, which are always open, are installed in parallel, improving the accuracy of setting the maximum and minimum combustion quantities, and improving the combustion quantity variable range. It can be set over a wide range of conditions, expanding the variable range of combustion, improving load control, and increasing comfort and energy savings. In addition, the combustion gas passage is always kept open to the minimum extent, and is highly safe as it eliminates the occurrence of unburned gas odor due to closure.

Since the main combustion gas passage area can be changed continuously, the combustion amount can be continuously adjusted from maximum to minimum, and can be set according to the load. Furthermore, since it can be varied continuously, it can significantly reduce the generation of flames, CO, and soot.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional example, and FIG. 2 is a longitudinal sectional view showing an embodiment of the present invention. 4...Light wick, 6...Inner flame tube, 7...Outer flame tube, 2
0...Main combustion gas passage, 21...Auxiliary combustion gas passage, 22...Resistance plate.

Claims (1)

[Scope of claim for utility model registration] (1) A combustion chamber consisting of a porous inner flame tube and an outer flame tube, a lamp wick whose tip is located in the combustion chamber during combustion, and a combustion chamber provided above the combustion chamber. A gas passage, a main combustion gas passage provided with a resistance plate at the outlet of the combustion gas passage that moves the distance to an opening that continuously varies the area of the combustion gas passage, and an auxiliary combustion gas passage with a constant opening area. A liquid fuel combustion device with parallel passages. (2) The liquid fuel combustion device according to claim 1, wherein the auxiliary combustion gas passage is configured to have a uniform opening around the main combustion gas passage.