JPS6227324B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a gas burner made by press-forming a metal pipe.

Conventionally, the lower burner for double-sided fish grilling on gas table stoves and gas burners used in direct-fired gas high-speed cookers have had flame holes formed by molding sheet metal. In order to make it universal, the width and shape of the flame hole were quite complex, and sometimes required precision that exceeded processing capabilities. In addition, since the flame hole expands and contracts due to heat, it is necessary to weld spots etc. at appropriate intervals. Also, in order to make it universal, the length of the flame hole was required. However, the length of the flame hole, which is effective in making it universal, is such that when actually cooking, oil dripping from fish or meat can easily accumulate and cause the flame hole to become clogged. It's not a thin wire-like thing,
After carbonization, it had to be removed. For this reason, when clogging occurred, not all flame holes were ignited, and sometimes even a small explosion occurred due to the filling of end-burning gas.

There were also gas burners that simply used pipes for combustion. However, they used iron pipes and used a drill to cut the flame holes. This is the same as conventional cast-type gas burners and cannot be made universal. In addition, even in the case of a single flame hole or multiple flame holes, the base of the combustion flame is cooled by secondary air and convection, and the soft phenomenon easily occurs.

The present invention eliminates the above-mentioned problems and at the same time saves labor by molding a thin-walled pipe using a press and processing the flame hole portion using a press. Furthermore, even if the oil that drips when grilling fish or meat should accidentally come into contact with the burner flame hole, it can be self-recovered, and it is designed to be universal.

An embodiment of the present invention will be described below with reference to the drawings.

The burner body 1 is press-molded from a thin stainless steel pipe with a thickness of 0.4 to 0.8 mm. Specifically, the burner body 1 has a shape as shown in FIG. The rectifying part 3 is made to bulge out in a substantially U-shape, and the tip of the rectifying part 3 is recessed in a V-shape or U-shape to create a flame hole enlarged part 4, and one end is sealed. The other end is a circular pipe-shaped throat part 6. Next, at the center of the bottom of the V-shaped or U-shaped enlarged flame hole part 4, as shown in FIGS. 2 and 3,
A large number of flame holes 7 are provided at equal intervals by punching holes from the outside. Here, the rectifier 3
The length L is at least twice the width H of the rectifying part 3, and the width H of the rectifying part is 2 times the apparent maximum diameter φD of the flame hole enlarged part 4.
~3 times or less. Since the flame hole 7 is formed by a piercing hole, it is provided with a straight portion S.

In the above configuration, gas flows into the burner body 1 from the throat portion 6, but since air is also naturally sucked at the same time, the gas and air flow into the burner body 1 in a mixed state. below,
This is called a mixture. The air-fuel mixture is mixed in a mixing chamber 2. The mixed air-fuel mixture is rectified and pressure-regulated in the rectifying section 3 up to the flame hole 7. The rectified air-fuel mixture passes through the flame hole 7, and after passing through the flame hole enlarged portion 4, is combusted.

Lift phenomenon occurs in combustion when there is an excess of air or when the base of the combustion flame is cooled and is blown away by the secondary air flow. Since the present invention has a structure in which the flame hole 7 is punched through the bottom of the V-shaped or U-shaped flame hole expansion part 4, the base of the combustion flame is not blown away by secondary air. In addition, since the rectifying section 3 is made U-shaped to increase the surface area of the flame hole, the area near the flame hole is heated more than before due to combustion heat, increasing the combustion speed and further stabilizing the base of the combustion flame. However, even gas with a slow combustion rate does not exhibit a lift phenomenon. At the same time, since combustion occurs through the flame hole enlarged portion 4, the same effect as when the flame hole area is large is achieved, and stable combustion can be obtained.
Further, gas having a high combustion rate is burned in the flame hole 7. At this time, even if it is a thin-walled pipe, since it is formed with a piercing hole, the straight part S of the flame hole 7 can be obtained at the same time, and at the same time, it has the same effect as a thicker wall.
A burner temperature difference is obtained between the mixture and the combustion side (cooler on the mixture side). That is, this eliminates the phenomenon of backfire and allows stable combustion to be achieved even with gases having a high combustion rate.

In addition, the structure is such that it is difficult for the flame hole to become clogged in practical terms. That is, since there is a V-shaped or U-shaped flame hole enlarged part 4, it is difficult for oil to drip directly into the flame hole 7, and at the same time, as mentioned above, the flame hole part
Because it is easily heated, even if it drops, the oil will be at a high temperature and will flow very easily, so it will flow without forming an oil film and will not cause clogging. In addition, the size of the flame hole 7 can be made smaller, so even if the oil gets hot and an oil film forms when the appliance is not in use, when it burns, the capacity of the oil itself will be small.
When the burner heats up, the oil film ruptures and flows, completely restoring the flame hole to its original state.

As described above, according to the present invention, a gas burner can be made universal, the base of the combustion flame is stabilized, there is no risk of a lift phenomenon occurring even with gas with a slow combustion speed, and there is a gap between the air-fuel mixture and the combustion surface. Since a temperature difference is obtained between the burners, even gas with a high combustion rate does not cause a backup fire phenomenon, and stable combustion can be obtained with gas with any combustion rate. Furthermore, there is no risk of the flame hole becoming clogged,
Easy to use. In addition, the rectifying section with a predetermined depth from the mixing chamber to the flame hole is narrower than the mixing chamber, and the opposing surfaces are parallel, so the outflow speed of the air-fuel mixture is constant all the way to the flame hole. rectification can be performed reliably.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of a gas burner obtained according to an embodiment of the present invention, Fig. 2 is an enlarged cross-sectional view of the same, and Figs. 3A and B are sectional views showing an embodiment of the enlarged flame hole. be. DESCRIPTION OF SYMBOLS 1... Burner main body, 2... Mixing chamber, 3... Rectifying part, 4... Flame hole expansion part, 5... Sealing part, 6... Throat part, 7... Flame hole.

Claims (1)

[Claims] 1. The metal pipe forming the mixing chamber is press-formed along the length of the metal pipe to form a U-shape that is narrower than the mixing chamber and has a predetermined depth with opposing surfaces parallel to each other. At the same time, a V-shaped or U-shaped concave flame hole expansion part is formed at the tip of the rectification part, and then a straight line is formed at the bottom of the flame hole expansion part by breaking through from the outside. 1. A method for producing a gas burner, which comprises drilling a large number of flame holes at appropriate intervals. 2 Set the width of the rectifying part to 2 of the apparent maximum diameter of the enlarged part of the flame hole.
A method for manufacturing a gas burner according to claim 1, in which the gas burner is reduced to 3 times or less.