JPS6335221Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a liquid fuel vaporizing burner that vaporizes and burns liquid fuel such as kerosene.

[Prior art]

This type of liquid fuel vaporization burner is installed so that a certain space is maintained between the outer circumferential surface of the upper part of the vaporizer and the flame-holding wall that covers the outer circumference of the flame opening of the burner head, and this space is extremely small. Although it is necessary,
Due to manufacturing variations, it is extremely difficult to install both in concentric circles with a constant space around the entire circumference.
During combustion, both thermally expand due to the heat of the flame, and the coefficient of thermal expansion of the vaporizer is much larger than that of the flame-holding wall, so the two come into contact and the heat of the flame-holding wall is transferred to the vaporizer, causing vaporization. The problem is that the temperature of the vessel rises more than necessary, making it impossible to achieve stable combustion.

The structure of a conventional example of this type of liquid fuel vaporizing burner will be explained below with reference to FIG.

In FIG. 1, 1 is an air supply pipe whose one end is connected to the air outlet of a combustion blower (not shown), 2 is an air injection nozzle formed at the other end of this air supply pipe 1, and 3 is the air injection nozzle. This is a fuel supply port of a fuel supply pipe 18 arranged facing the throat of the fuel tank 2.

4 is a cylindrical heat shielding case with an open top surface, and 5 is a metal cylindrical burner case. This burner case 5 is fixed to a container-shaped vaporizer 6 with an open top surface by screwing to the top opening. A burner head 8 is mounted and fixed on the upper surface of the aperture plate 7, and a vaporization heater 9 is integrally buried in the upper wall of the vaporizer 6.

As shown in the figure, the burner head 8 is constructed by laminating a plurality of cover plates 8a and annular laminate plates 8b.
A large number of flame ports 10 are radially opened on the outer periphery.

Reference numeral 11 denotes a flame-holding wall, which is a cylindrical wall portion 11a formed so as to keep a predetermined distance between the flame port 10 of the burner head 8 and the upper outer circumferential surface of the vaporizer 6.
and a disk wall portion 11 placed on the collar portion 6a of the carburetor 6.
It consists of b.

The heat shielding case 4 has a cylindrical shape with an open top, surrounds the outer periphery of the carburetor 6 while maintaining an appropriate space 12, and has an ignition plug 13 and a flame detection rod (not shown) on the top. ) etc. is provided with a flange surface 4a to which it can be fixed.

14 is a fixing plate for the ignition plug 13; 15 is a through hole for guiding the outlet 9a of the vaporizing heater 9 to the outside of the heat shielding case 4; 16 is a closing plate that closes the through hole; and 17 is an air supply pipe at one end. 1 and the other end is connected to heat shielding case 4.
An air pipe connected to the side of the combustion blower (not shown) connects air from the combustion blower (not shown) to the outer periphery of the vaporizer 6 and the heat shield case 4.
Air is blown into the space 12 provided between the carburetor 6 and the vaporizer 6, and the air acts to cool the outer circumferential surface of the carburetor 6.

Next, the operation of the conventional burner having the above configuration will be explained.

The vaporizer 6 is preheated by the vaporization heater 9.
Liquid fuel is mixed with air and liquid from the combustion blower. Then, it instantly becomes gaseous on the inner surface of the vaporizer 6, passes through the opening 7a of the throttle plate 7, and reaches the flame port 10 of the burner head 8.

Then, the ignition plug 13 is also ignited, and a flame is formed between the outer periphery of the burner head 8 and the flame-holding wall 11. After combustion, the vaporization heater 9 is turned off, and the heat required to vaporize the liquid fuel is transferred to the flame-holding wall 1 using the flame.
1 or the burner head 8 is heated, the heat is transmitted to the wall surface of the vaporizer 6, and the fuel is vaporized using the heat recovered from the flame.

The amount of heat recovered from the flame at this time is extremely large, and for the safety of the vaporizer 6, it is necessary to cool the outer circumferential surface of the vaporizer 6 to a high temperature. Air is allowed to flow into the space 12 between the two to cool the vaporizer 6 and control the temperature.

In the above, the upper outer circumferential surface of the vaporizer 6 and the cylindrical wall portion 11a of the flame-holding wall 11 maintain a certain small space b in order to properly recover heat to the vaporizer 6, as described above. However, this space b cannot be kept constant due to manufacturing variations, thermal expansion, etc., and the vaporizer 6 and the flame-holding wall 11 may come into contact with each other. When the two come into contact, the flame-holding wall 11 is constantly exposed to flame and therefore has a very high temperature, and that heat is transferred to the vaporizer 6, causing the temperature of the vaporizer 6 to rise more than necessary, causing the fuel to evaporate. The disadvantage was that the temperature at which the gas was vaporized was inappropriate, resulting in unstable combustion. Also, a part of the air-fuel mixture ejected from the flame port 10 at the time of ignition is in the space b.
There were drawbacks such as ignition errors being more likely to occur due to leakage to the outside through the fuel.

[Overview of Koan]

This idea was made to eliminate the above-mentioned drawbacks of the conventional technology, and consists of a plurality of C-shaped rings made of wire with low thermal conductivity in the space formed between the outer peripheral surface of the upper part of the vaporizer and the flame-holding wall. In addition to interposing the C
The open parts of the shaped rings are offset from each other to eliminate contact between the flame stabilizing wall and the upper outer circumferential surface of the vaporizer, thereby properly maintaining recovered heat, stabilizing combustion, and reducing the amount of heat during ignition. This prevents ignition errors by eliminating air-fuel mixture leakage.

[Example of idea]

An embodiment of this invention will be described below with reference to FIGS. 2 to 4. The same reference numerals in the drawings indicate the same structures as in the conventional example, and the explanation thereof will be omitted.

In the figure, reference numeral 6b indicates two grooves formed on the upper outer circumferential surface of the vaporizer 6, and 19 indicates a heat exchanger inserted between the upper outer circumferential surface of the vaporizer 6 and the flame-holding wall 11 by fitting into the grooves. It is a C-shaped ring made of a wire with low conductivity, and its open portions 19a are installed with their positions shifted from each other.

That is, a concave groove 6b is formed on the upper outer peripheral surface of the vaporizer 6, a C ring 19 made of a wire material with low thermal conductivity is fitted into the concave groove, and a flame stabilizing wall 11 is attached to the outer circumference of the C ring 19.
This means that even if there are manufacturing variations or thermal expansion, the vaporizer 6
The upper outer peripheral surface of the vaporizer 6 and the flame-holding wall 11 are in contact with each other through the ring 19, and the ring 19 and the flame-holding wall 11 are in line contact, so heat conduction is extremely small and the temperature of the vaporizer 6 is kept at an appropriate temperature. This has the effect of making combustion safer.

Furthermore, since the C-shaped rings 19 are installed with their open portions 19a shifted from each other, communication in the vertical direction of the microspace b is cut off by the C-shaped rings 19, so that the air-fuel mixture at the time of ignition is There is no leakage to the outside through the space b, resulting in the effect that ignition errors can be prevented.

[Effect of idea]

As described above, according to this invention, a plurality of C-shaped rings made of a wire with low thermal conductivity are interposed in the space between the upper outer peripheral surface of the vaporizer and the flame-holding wall, and the C-shaped rings are Since the open parts are installed at different positions, the heat recovered from the flame-holding wall to the vaporizer can be properly maintained, stabilizing combustion, and preventing ignition mistakes by eliminating air-fuel mixture leakage during ignition. You can get the effect of being able to do it.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional liquid fuel vaporizing burner, Fig. 2 is a sectional view showing an embodiment of the liquid fuel vaporizing burner according to this invention, Fig. 3 is an enlarged sectional view of the main part thereof, and Fig. 4 is a sectional view showing an embodiment of the liquid fuel vaporizing burner according to the invention. The figure is a plan view of the C-shaped ring. In the figure, 6 is a vaporizer, 8 is a burner head, 10 is a flame opening, 11 is a flame-holding wall, 19 is a C-shaped ring, and b is a space.

Claims (1)

[Scope of utility model registration request] A cylindrical vaporizer with an open top, a burner head having a large number of flame ports provided at the opening of the vaporizer, and a flame-holding wall that covers the outer periphery of the flame port of the burner head and the upper part of the vaporizer. , in which liquid fuel is injected together with air into the vaporizer and then combusted at the flame opening of the burner head, a flame-holding wall is formed between the outer circumferential surface of the upper part of the vaporizer and the flame-holding wall. A liquid fuel vaporization type burner in which a plurality of C-shaped rings made of wire are interposed in a space, and the open parts of the C-shaped rings are offset from each other.