JPH0127326B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an annular combustion flame emitted from a gas jet passage and a gas passage provided on the inner circumferential side and the outer circumferential side of the inner combustion cylinder, respectively. Adjustment is made so that the ejection speeds of the mixed gas ejected from the gas ejection passage and the gas passage are approximately the same, thereby stabilizing a combustion flame that has approximately the same ejection speed even during vaporization combustion ranging from large combustion to small combustion. This invention relates to a vaporizing burner that can emit flame.

First, as described in Japanese Patent Publication No. 58-15685, the applicant formed a gas passage between an inner combustion tube and an outer combustion tube, and a central opening of the inner combustion tube was provided with a gas passage in front of the central opening. A vaporizing cylinder with one side open is rotatably provided so as to form a gas ejection passage between it and the inner combustion cylinder, and the vaporizing cylinder and the gas ejection passage and the gas passage are formed in a communicating manner. A blower tube is inserted into the cylinder and an opening is inserted into the cylinder, so that the mixed gas generated in the vaporization cylinder can be combusted in a ring shape through a gas jet passage and a gas passage provided around the vaporization cylinder. We developed a vaporizing burner, and as it has been put into practice, it has shown considerable effectiveness.

By the way, when the mixed gas generated in the vaporization cylinder as described above is subjected to jet combustion through the annular gas ejection passages and gas passages provided on the inner and outer circumferential sides of the inner combustion cylinder, respectively, Due to pressure feeding, the ejection speed of the mixed gas is faster on the gas ejection passage side located on the outside than on the gas ejection passage side disposed on the inside, making it impossible to adjust the gas ejection speed so that it is approximately equal. As a result, the combustion flame from the gas passage becomes large and powerful, while the combustion flame from the gas jetting passage becomes small and weak, making it impossible to emit a combustion flame with approximately the same ejection speed. The above-mentioned phenomenon became more serious as the amount of combustion increased, resulting in the disadvantage that stable vaporization combustion could not be continued for a long period of time.

Therefore, in order to solve the drawbacks of the above-mentioned known vaporizing burners, the present invention provides a system in which a mixed gas injected from a gas passage formed between an inner combustion tube and an outer combustion tube is provided at the tip side of the outer combustion tube. Once drawn into the annular negative pressure part to create a reduced pressure state, and after slowing down the jetting speed, the jets are adjusted so that the jetting combustion is performed at a slow jetting speed. The purpose of this invention is to obtain a vaporizing burner that can perform fume combustion of mixed gas at approximately the same ejection speed even when the mixed gas is fume-combusted from the gas ejection passage and the gas passage. be.

In view of the foregoing, in order to achieve the above object, the present invention has a structure in which the distal end side of the outer combustion tube is expanded outwardly to have a diameter slightly larger than the diameter of the cylinder wall of the outer combustion tube. A vaporizing burner characterized in that an annular negative pressure part is formed inside an enlarged stepped part provided at the boundary between the cylinder wall of the outer combustion cylinder and the flame cylinder,
According to such a vaporizing burner, the gas mixture generated in the vaporizing cylinder is combusted with jets at different ejection speeds through the gas jetting passage and the gas passage provided on the inner circumferential side and the outer circumferential side of the inner combustion cylinder. Even in such cases, only the mixed gas that is injected at a higher injection speed than the gas passage is transferred to the outer combustion tube and the tip side of the outer combustion tube, whose diameter is slightly larger than that of the outer combustion tube. After the flame is drawn into the annular negative pressure section provided on the inside of the boundary with the flame tube shaped like this to reduce the pressure and slow down the ejection speed, the flame is slowly emitted forward along the inner circumferential surface of the flame tube. In addition, the jetting speeds of the mixed gas jetted from the gas jetting passage and the gas passage are adjusted so that they are approximately the same.
Even during vaporization combustion ranging from large combustion to small combustion, combustion flames having substantially the same ejection speed can be stably emitted.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The vaporizing burner according to the present invention will be described below with reference to preferred embodiments shown in the accompanying drawings.

In the drawings, reference numeral 1 denotes an outer combustion tube made of a thin material such as an iron plate, and the outer combustion tube is formed into a bottomed cylindrical shape having a relatively short cylindrical wall 1a with an open end. Moreover, the center side of the bottom bulges outward to provide a recessed part 2 of an appropriate depth. 3 is an inner combustion tube made of the same material as the outer combustion tube 1; The inner combustion tube 3 is formed in the shape of a bottom cylinder, and the inner combustion tube 3 is disposed within the outer combustion tube 1 so that a gas passage 4 of an appropriate width is formed between the outer combustion tubes 1. The opening peripheral wall 5, which is opened at approximately the center of the inner combustion tube 3, stands up in a tapered shape to form a recess 6 in the center. 7 is a rotating shaft inserted through the center of the inner combustion tube 3;
A vaporizer tube 8 with one side open is directly connected to the tip of the tube.

A gas mixture 10 is integrally attached to the open side of the vaporization tube 8 with a fuel flow gap 9 between it and the open end of the vaporization tube 8. The above-mentioned mixed gas 10 is formed into a combustion guide cylinder 12 whose front half expands outward with a boundary wall 11 as a boundary, and a cylinder 13 with the same diameter at the rear half, and is formed into a hollow cylindrical shape as a whole. The tip of the guide tube 12 serves as a fuel splashing end 14. The majority of the cylindrical body 13 of the gas mixture 10 described above is fitted into the recess 6 to connect the opening peripheral wall 5 and the gas mixture 1.
An annular gas ejection passage 15 is formed between the fuel guide cylinder 12 of No. 0 and the fuel guide cylinder 12 of No. Therefore, the gas passage 4
Both the gas ejection passage 15 and the gas ejection passage 15 communicate with the inside of the vaporization cylinder 8 . Reference numeral 16 denotes a blower tube inserted into the carburetor tube 8, and the base end side of the blower tube 16 has a ventilation port 1 opened at the center of the concave portion 2 of the outer combustion tube 1.
7 is attached around the periphery.

18 is a fuel diffuser 1 attached to the inner surface of the carburetor 8
This is an oil pipe arranged so that the tip opening can be seen on the 9 surface. 20 is a bottomed cylindrical cold air guide tube arranged so that a cold air passage 21 is formed on the outer periphery of the outer combustion tube 1, and the cold air passage 21 is opened at the center of the bottom wall side of the cold air guide tube 20. It communicates with the ventilation opening 22 through the ventilation gap 23. The tip side of the outer combustion tube 1 is expanded outward to form a short flame tube 24 so as to have a diameter slightly larger than the diameter of the cylinder wall 3a of the outer combustion tube 1. An annular negative pressure section 26 is formed inside an enlarged step section 25 provided at the boundary between the cylinder wall 1a and the flame tube 24. 27 is a spark plug.

Next, its effect will be explained.

Now, in FIG. 1, if forced air is blown into the vaporizing cylinder 8 through the air outlet 22 and the air outlet 17, the forced air will be blown out from the gas passage 4 and the gas jetting passage 15. Therefore, when the raw fuel is sent from the oil pipe 18 to the inner surface of the rotating carburetor 8 through the fuel diffuser 19, the fuel is diffused into a thin film by the rotating centrifugal force of the carburetor 8 and the blowing action of forced air. The fuel is transferred to the inner circumferential surface of the fuel guide tube 12 through the fuel distribution gap 9, and is scattered from the entire circumference of the fuel scattering end 14 to the inner circumferential surface of the cylinder wall 3a of the inner combustion tube 3, where it is ignited and burnt live. . When the fuel is live-combusted in this way, the entire vaporization cylinder 8 is heated by the combustion heat,
The internal temperature is raised to the temperature of the vaporizing atmosphere.

Therefore, from then on, the fuel delivered to the inner circumferential surface of the vaporizing tube 8 and the forced air blown into the vaporizing tube 8 are both heated, and the fuel is diffused and transferred along the inner circumferential surface of the vaporizing tube 8. The vaporized gas is quickly evaporated and vaporized while being exposed to the air, and the vaporized gas is mixed with high-temperature wind.
When passing through the cylindrical body 13 of 0, the gas is stirred and mixed to become a complete mixture of gases, which is then pressurized into the gas passage 4 and then ejected from the annular gas passage 4 and the gas jetting passage 15. It is ignited by the combustion flame, and the vaporization combustion flame is ejected forward to intensely heat the entire vaporization tube 8 with the double ring flame, so that from then on the supplied raw fuel becomes a reliable mixed gas continuously. However, it burns efficiently with a blue flame.

By the way, during vaporization combustion as mentioned above,
In relation to the pressure feeding of the mixed gas, the gas passage provided on the outer circumferential side of the inner combustion tube 3 is lower than the jetting speed of the mixed gas ejected from the gas jetting passage 15 provided on the inner circumference side of the inner combustion tube 3. The jetting speed of the mixed gas jetted out from No. 4 is faster, and a difference inevitably occurs in the jetting speed, making it impossible to stably continue good vaporization combustion while maintaining substantially the same jet flame state.

However, in the present invention, the tip side of the outer combustion tube 1 is expanded outward to have a diameter slightly larger than the diameter of the cylinder wall 1a of the outer combustion tube 1, and is formed into the flame tube 24, and Cylinder wall 1 of combustion tube 1
Since an annular negative pressure part 26 is formed inside the enlarged step part 25 provided at the boundary between the gas passage 4 and the ejection tube 24, the mixture ejected from the discharge part from the gas passage 4 is The gas is once drawn into the negative pressure section 26 to be in a reduced pressure state, and its ejection speed is slowed down, and it is ejected forward at a slow ejection speed along the inner circumferential surface of the flame cylinder 26.

Therefore, the gas passage 4 and the gas ejection passage 1 provided on the outer circumferential surface and the inner circumferential surface of the inner combustion cylinder 3
The jetting velocities of the mixed gases jetted out from each of the combustion chambers 5 and 5 are adjusted to be substantially the same, and a stable combustion flame can be emitted. Therefore, even if vaporization combustion from a large combustion amount to a small combustion amount is performed at any time, it is possible to continuously eject combustion flames having approximately the same ejection speed and maintain stable blue flame combustion.
Since it is constantly cooled by the cold air flowing through the cold air passage 21, there is no risk of burnout, and by forming the enlarged stepped portion 25, it is possible to prevent deformation caused by heat.

[Brief explanation of drawings]

The drawings show an embodiment of the vaporizing burner according to the present invention, in which FIG. 1 is a partially cutaway longitudinal sectional front view, and FIG. 2 is a partially cutaway enlarged longitudinal sectional front view of the main parts. . 1... Outer combustion tube, 1a... Its tube wall, 3...
Inner combustion tube, 3a... its tube wall, 4... gas passage, 8... vaporization tube, 15... gas ejection passage, 16
... Blow tube, 24 ... Flame tube, 25 ... Enlarged step section, 26 ... Negative pressure section.

Claims (1)

[Claims] 1. A gas passage is formed between the inner combustion tube and the outer combustion tube, and a gas jetting passage is formed between the vaporization tube with one side open at the front side of the central opening of the inner combustion tube and the inner combustion tube. The carburetor cylinder is rotatably provided to form a gas jet passage and a gas passage so as to communicate with each other, and an air blower cylinder is inserted into the vaporizer cylinder and opened. is formed into a flame tube by expanding outward to have a diameter slightly larger than the diameter of the cylinder wall of the outer combustion tube, and an enlarged stepped portion provided at the boundary between the cylinder wall of the outer combustion tube and the flame tube. A vaporizing burner characterized by having an annular negative pressure section formed inside.