JPH0457921B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a liquid fuel combustion device used for home heating and the like.

BACKGROUND TECHNOLOGY In a wick-type liquid fuel combustion device used in kerosene stoves, etc., the calorific value can be varied by moving the wick up and down to change the evaporation area of the liquid fuel, and by varying the amount of air flowing into the vicinity of the wick. There is a structure that changes the temperature and fuel vapor pressure, which are the evaporation conditions of liquid fuel. However, even though the calorific value can be changed in either case, it is difficult to maintain a good combustion state.

Problems to be Solved by the Invention When the calorific value of a liquid fuel combustion device is lower than the rated value, the fuel gas becomes diluted, the combustion speed slows down, and the flame in the primary combustion chamber suffers lifting, oscillation, etc. Eventually, the secondary flame surface becomes unstable, and unburned gas is discharged without completing combustion, resulting in large amounts of carbon monoxide, pungent odor, etc., making it unusable.

The present invention solves the above conventional problems,
The purpose is to create an appropriate fuel-air ratio and prevent flame lifting and swinging.

Means for Solving the Problems The present invention has an air flow pipe whose upper end communicates with the atmosphere and a secondary combustion chamber that communicates with the primary combustion chamber, and which passes through the inner flame cylinder, and which has a lower end that communicates with the atmosphere. A valve for opening and closing is provided, and a device for raising and lowering this valve has a cam, and is located within the core guide cylinder and provided on the operating shaft of the core lifting device.

Effect In the above configuration, when the valve of the pipe is opened, the draft can be appropriately varied by the air flowing into the secondary combustion chamber. Therefore, the draft in the primary combustion chamber also changes according to changes in the draft in the secondary combustion chamber, and the amount of heat generated can be varied. The air that flows out of the pipe into the atmosphere is exhausted without contributing to combustion,
Even if the calorific value changes, there is little change in the fuel gas concentration, so the secondary flame surface is stabilized without lifting or swinging of the flame, and combustion is completed, reducing carbon monoxide and irritation in the exhaust gas. It can reduce odor etc. In addition, a lifting device that operates together with the operating shaft of the core lifting device raises and lowers the valve by the movement of a cam.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings.

The lower part of the lamp wick 1 is submerged in liquid fuel in a fuel tank 2, and can be moved up and down using a wick outer tube 3 and a wick guide tube 4 as guides. A wick holder 5 is provided inside the wick 1, on which the wick 1 is installed.
By rotating the interlocking wick up/down device 6, the wick 1
goes up and down. Further, the operating shaft 7 passes through the core guide cylinder 4, and its end is supported by a support part 8 on the inner wall of the core guide cylinder 4. At the approximate center of the operating shaft 7 inside the core guide cylinder 4, there is a cam-shaped A lifting device 9 is provided. If the core up/down device 6 is rotated, the lifting device 9 will rotate,
The valve 10 moves up and down to open and close the lower end of the pipe 12 provided in the inner flame cylinder 11. 13 is a guide for the support rod 14 of the valve 10. 15 is the outer flame tube, and the inner flame tube 1
1 constitutes a primary combustion chamber 16. The outer flame cylinder 15 is provided with a large number of air holes 15a, and above it is provided a red hot part 15b made of a punching plate, etc., and a secondary flame ring 1 is installed at the upper end of this red hot part 15b.
7 is provided. A large number of air holes 11a are provided on the side wall of the inner flame tube 11, and a top plate 11b and a plurality of relatively large openings 1 are provided above the inner flame tube 11.
A chimney top 20 provided at the upper end of the upper incandescent body 19 is provided.
supports the upper end of the transmission tube 22 placed on the outer tube 20. The chimney top 20 is provided with a main exhaust gas passage 20a having a large opening in the center and a plurality of auxiliary exhaust gas passages 20b around the main exhaust gas passage 20a. The chimney top 20 and the transmission tube 22 make up the secondary combustion chamber 2.
3. 24 is a secondary flame formed on the secondary flame ring 17. 26 is an air flow flowing into the pipe 12.

In the above configuration, when the wick up/down device 6 is first turned to raise the wick 1 to match the rated calorific value, the valve 10 also goes up and closes the pipe 12. (Thus, the diagram shows when the calorific value is reduced, and in the case of the rated value, the valve 10 is at the position indicated by the broken line.) At this time, when the wick 1 is ignited, combustion starts, and the high-temperature combustion gas from combustion is used for primary combustion. An upward air current (draft) is generated by passing through the main exhaust gas passage 20a and the auxiliary exhaust gas passage 20b of the chamber 16 and the chimney top 20, and the air necessary for combustion flows in through the air holes of the inner flame tube 11 and the outer flame tube 15. do. Further, the lamp wick 1 is supplied with airflow and the heat of the flame held in each air hole to evaporate the liquid fuel and sustain combustion. When it is desired to reduce the amount of heat generated, the wick 1 is lowered by the wick up/down device 6, and the valve 10 is lowered to open the pipe 12. At this time, since a draft is occurring in the secondary combustion chamber 23, the air flow 25 passes through the pipe 12 and flows into the secondary combustion chamber 23, weakening the draft acting on the primary combustion chamber 16 and causing the inner flame to flow. By reducing the amount of air flowing into the vicinity of the lamp wick 1 from the lower air hole 11a of the tube 11, the amount of heat generated is reduced and an appropriate amount of air is obtained, and the flame holding of the secondary flame 24 is stabilized and good condition is achieved. Combustion can be carried out.

Effects of the Invention According to the liquid fuel combustion device of the present invention, the following effects can be obtained.

(1) A pipe that communicates with the atmosphere is installed in the secondary combustion chamber located above the primary combustion chamber, and when the amount of heat generated is reduced, the airflow is removed through the pipe, thereby controlling the airflow that flows into the primary combustion chamber. It creates an appropriate ratio of fuel and air, prevents flame lifting and swinging, and achieves good combustion conditions.

(2) Appropriate amount of air can be obtained when the calorific value is reduced, so it prevents the secondary flame from falling into the primary combustion chamber, stabilizes the secondary flame, and is well suited to changes in calorific value. The range of combustion can be widened.

(3) Since the lifting device installed on the operating shaft of the wick up-and-down device has a cam, the movement of the valve can be made minute and accurate, and the combustion amount and air amount can be adjusted appropriately, improving exhaust gas characteristics and hysteresis. This phenomenon does not occur and variations can be reduced.

(4) Since the valves are opened and closed at the lower end of the pipe, these operating parts are not exposed to high temperatures, and high reliability in terms of accuracy and life can be achieved.

[Brief explanation of drawings]

The figure is a sectional view of a combustion device showing an embodiment of the present invention. 1... Lamp wick, 6... Wick up/down device, 7... Operating shaft, 9...
Lifting device, 10...valve, 12...pipe.

Claims (1)

[Claims] 1. A primary combustion chamber consisting of an inner flame tube and an outer flame tube with a large number of air holes, a secondary combustion chamber provided in communication with the upper part of this primary combustion chamber, and this secondary combustion chamber. A pipe for air circulation whose upper end communicates with the atmosphere and passes through the inner flame cylinder, a valve provided at the lower end of this pipe to open and close this pipe, and a pipe whose tip faces into the primary combustion chamber. a wick, a wick up/down device for raising and lowering the wick, a wick guide tube provided inside the wick, an operating shaft of the wick up/down device provided to penetrate the wick guide tube, and the operating shaft. A liquid fuel combustion device comprising: an elevating device having a cam provided in a part of the core guide cylinder; and a support rod that operates in contact with the elevating device to move the valve up and down.