JPS609551Y2 - combustion device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a combustion device for forced vaporization and premix combustion of liquid fuel.

In a conventional liquid fuel combustion apparatus, liquid fuel is vaporized and mixed with air, and this air-fuel mixture is ejected from a flame hole in a burner plate to form a flame on the front surface of the burner plate.

In this case, if the supply amount of combustion air or fuel is not properly controlled and the speed of the air-fuel mixture injected from the flame hole of the burner plate is too high, the flame may be blown out.

The present invention has been devised in view of the above points, and an object of the present invention is to provide a combustion device that prevents the flame from blowing out due to an increase in the fuel injection speed.

For this reason, the combustion device according to the present invention specifically includes a burner plate holding plate near the flame hole formed in the burner plate for reducing the fuel injection speed.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

In FIG. 1, 1 is a combustion device main body, and 2 is a heater, which is embedded in the combustion device main body 1.

3 is a fuel pipe, 4 is an opening for introducing primary air, 5 is a vaporization mixing chamber, 6 is a first burner plate, 7 is a second burner plate, 8 is a burner plate holding plate, 13 is a flame hole, and 14 is a combustion device It is a housing.

A secondary air supply pipe 12 is provided in the center of the combustion device main body 1 .

An air-fuel mixture passage opening 11 is formed around the secondary air supply pipe 12 in the center of the first burner plate 6 .

Combustion air is supplied into the combustion device casing 14 as indicated by arrow A by a blower (not shown), and is further supplied to the secondary air supply pipe 1.
2 to the center of the flame surface as shown by arrow B, and through the opening of the partition plate 15 to the periphery of the flame surface as shown by arrow G.

The liquid fuel is supplied into the vaporization mixing chamber 5 through the combustion pipe 3 as shown by arrow C, mixed with air introduced from the primary air introduction opening 4 as shown by the arrow, and vaporized, and vaporized and mixed as shown by arrow E. It diverges into the chamber 5 and passes through the air-fuel mixture passage opening 11 of the first burner plate 6 while turning as shown by the arrow F.

This air-fuel mixture forms a large number of flames through a large number of slits formed on the outer periphery between the first burner plate 6 and the second burner plate 7, heats the tip of the combustion device main body 1, and vaporizes the liquid fuel. The heat of vaporization required for this process or the amount of heat required for heating the mixture is recovered.

Further, the air-fuel mixture is also ejected from the flame hole 13 of the second burner plate 7 to form a combusted flame 10.

In such a combustion device, the burner plate holding plate 8
The outer diameter of the second burner plate 7 is increased and its outer peripheral edge becomes the second burner plate 7
It is arranged so that the flame reaches the vicinity of the flame hole 13.

In this case, the outer periphery of the burner plate holding plate 8 is connected to the flame hole 13.
The size of the burner plate holding plate 8 is determined to such an extent that it contacts the flame 10 formed on the downstream side.

Then, when the air-fuel mixture is ejected from the flame hole 13, a vortex 9 is generated between the base of the flame 10 and the burner plate holding plate 8, as shown in FIG.

In this part of the vortex 9, the injection speed of the air-fuel mixture decreases.

That is, since the burner plate holding plate 8 forms a low-speed portion of fuel injection during mixture injection, the flame 10 is prevented from being blown away.

As explained above, according to the present invention, the burner plate is installed around the secondary air supply pipe provided in the center of the combustion device main body, and the burner plate is mounted on the front surface of the burner plate on the downstream side of the flame hole provided in the burner plate. The outer periphery of a burner plate holding plate having a fixed thickness and a predetermined thickness shorter than the height of the flame to be formed is positioned near the flame hole, and fuel is injected from the flame hole to the base of the flame formed by combustion. Since a vortex of fuel is generated to form a low-velocity portion of fuel injection, it is possible to prevent the flame from blowing out.

Therefore, compared to conventional devices, it is possible to significantly improve flame blowout caused by fluctuations in fuel injection speed from the flame hole.
Therefore, it is possible to obtain the effect that the combustion stability can be made extremely stable.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of a combustion device according to the present invention, and FIG. 2 is an enlarged cross-sectional view of a main part of the combustion device according to the present invention. 1... Combustion device main body, 3... Fuel pipe,
5... Vaporization mixing chamber, 6... First burner plate, 7... Second burner plate, 8...
...Burner plate holding plate, 10...Flame, 12...Secondary air supply pipe 13...
Flame hole.

Claims (1)

[Scope of utility model registration request] In a combustion device that injects fuel from a flame hole provided in a burner plate to produce a flame, the burner plate downstream of the flame hole is placed around a secondary air supply pipe provided in the center of the combustion device main body. The burner plate is fixed to the front surface, and a burner plate holding plate having a predetermined thickness shorter than the height of the flame to be formed is arranged, and a vortex of the injected fuel is generated at the base of the flame to suppress the low-velocity portion of the combustion injection. A combustion apparatus characterized in that an outer peripheral edge of the presser plate is located near the flame hole in order to form a flame and prevent the flame from blowing out.