JPS6016835Y2 - Mixed gas hand burner for crafting - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mixed gas band burner for craft work using oxygen, which can exhibit various performances as a gas band burner for craft work even with high-calorie gas such as natural gas having a relatively slow combustion rate.

Band burners currently used for crafting glass, etc. can be divided into pre-mixing types, in which the combustion gas and auxiliary fuel (air or oxygen) are mixed on the burner top surface, and pre-mixing types, in which they are mixed before the burner top. .

On the other hand, in recent years, improvements in glass materials have led to the use of hardened glass with a high softening point, and as a result, the use of oxygen as an auxiliary fuel has increased significantly, instead of the conventional air.

When using oxygen, there are safety concerns regarding backflow and backfire;
In addition, the pre-mixed type is often used.

In addition, the forming flame required for glasswork, etc. requires a high-temperature flame with a sharp tip, and a slightly lower-temperature, wider flame for heat removal and cooling. It is necessary to be able to switch smoothly and with stable flame conditions.

Recently, the fuel gas used has changed from the conventional hydrogen-based, fast-burning gas, to the use of relatively slow-burning gases such as natural gas and propane. It is expected that the frequency of use of these gases will continue to increase.

When burning with natural gas and oxygen using a mixed gas band burner that uses city gas 6C, which is currently on the market, the flame formed is unstable such as blowing out, or only a long and narrow flame is formed. There are problems such as not being able to do it.

Furthermore, if the number of oxygen nozzles is increased to enable the formation of various types of flames, the operation becomes complicated and there is a problem that one-handed operation becomes impossible.

In view of the above points, the inventor of the present invention devised the shape of the burner top after conducting various combustion tests, so that even high-calorie gases such as natural gas, which have a relatively slow combustion speed, can be used with a sharp tip and a high-temperature flame, while maintaining a slightly low temperature. We have devised a mixed tip gas band burner for craft work that can switch and form a wide range of flames with simple operations.

The present invention will be explained based on the drawings.

FIG. 1 is an overall view of the tip-mixing gas band burner of the present invention, FIG. 2 is a sectional view of the mixing section of the same burner, and FIG. 3 is a sectional view of the burner top of the same burner.

In FIG. 1, the gas whose amount is adjusted by the gas cock bundle 6 is ejected from the gas nozzle 4 and is ejected from the air hole 5.
More air is sucked in and mixed in the mixing chamber 3.

In this case, the gas nozzle 4 is installed immediately after the gas cock.

Further, the nozzle diameter is determined in consideration of the gas pressure so that the gas does not flow out from the air hole regardless of the opening degree of the gas cock and regardless of which direction the burner is facing.

On the other hand, the amount of oxygen for auxiliary combustion is adjusted by the bundle 7 for adjusting the amount of oxygen, and is mixed with the mixed gas coming from the mixing chamber to the burner top 1 at the tip of the oxygen nozzle 2 and combusted.

As shown in Fig. 3, the burner top of the present invention has three annular slits 8 centered on the oxygen nozzle center on the burner top surface.
The depth of each slit is 2 mm or more, and a large number of circular holes 9 are uniformly provided at the bottom of the annular slit 8.

The diameter of the circular hole should be slightly smaller than the width of the annular slit.

The larger the number of circular holes, the better the flame formation, but it is determined by considering the amount of mixed gas determined by the gas nozzle diameter and gas pressure.

Both the width of the annular slit 8 and the thickness of the slit wall 10 are small.

The outermost annular slit 8 is made the narrowest, and each slit wall 1
Make all thicknesses of 0 less than or equal to 1.

A burner top with triple circular holes and annular slits with this configuration allows for good rectification and dispersion of the mixed gas, and the reduction in flow velocity of the mixed gas generates excess flow, resulting in a good flame-holding effect.
The required filigree formation is obtained.

Note that the slit tip surface is 2rI from the burner top outer wall surface.
r! It is recessed inward by about n.

This improves the flame-holding effect.

The influence of the shape of the oxygen nozzle after formation is the gap between the oxygen nozzle and the burner top and the distance between the oxygen nozzle tip surface and the slit tip surface.

The former is, of course, related to the amount of mixed gas passing through, and the present inventor has found through various tests that the flame holding effect is the best when the following relationship is met, and the required finish for craft work can be obtained without a bright flame. I found out.

604 For the latter, if the oxygen nozzle tip surface protrudes too far from the slit tip surface, the flame will blow out, and if it recesses too much inward, the formed tip will become blurred.
A suitable distance between the oxygen nozzle tip surface and the slit tip surface is approximately 0.5rrrI11-1. oTfrIn.

The functions and effects of the gas band burner for craftwork constructed as described above are summarized as follows.

1. The flame stability is good, and it is possible to obtain a fine finish that cannot be achieved with conventional pre-mixed gas band burners using oxygen.

2 There is no risk of flashback, etc., and bright flame is eliminated.

3. Easy to operate and can be operated with one hand.

4. The structure is relatively simple, so manufacturing is less difficult and less expensive.

[Brief explanation of drawings]

FIG. 1 is an overall view of the tip-mixing gas band burner of the present invention, FIG. 2 is a sectional view of the mixing section of the same burner, and FIG. 3 is a sectional view of the burner top of the same burner. 1... Burner top, 2... Oxygen nozzle, 3... Mixing chamber, 4... Gas nozzle, 5... Air hole, 6 ...Bundle for gas cock, 7...Bundle for oxygen amount control valve, 8
......Annular slit, 9...Circular hole, 10
・・・・・・Slit wall.

Claims (1)

[Scope of utility model registration request] In a mixed gas band burner that uses oxygen as an auxiliary fuel and naturally sucks air with the fuel gas and mixes it in a mixing chamber, the burner top at the tip of the mixing chamber is connected to a bar with an annular slit centered on the center of the oxygen nozzle for the auxiliary fuel. Three slits are provided on the nut surface, the depth of the slits is 2rrrm or more, a number of circular holes communicating with the mixing chamber are provided at the bottom of the slits, and the thickness of each slit wall is 1 mm or less. Features a mixed gas band burner for crafting.