JPH01256710A - Method for manufacturing combustion device - Google Patents

Abstract

PURPOSE:To reduce the number of component parts and simplify a manufacturing procedure by a method wherein a plurality of steel plates are overlapped on each other, an opening is left at the outer-most circumference of the steel plate, an entire circumference of the steel plate is welded and then adequate fluid is added from the opening, an expanded part is formed through a pressurization and formation and then a gas blowing hole is opened at the expanded part at its proper position. CONSTITUTION:At first, two stainless steel plates 21 are overlapped on each other while they are not formed. An inner-most circumference 22 and an outer-most circumference 23 are welded by TIG welding which is a kind of arc welding with an opening 24 being left at an outer-most circumference 23 of the stainless steel plate 21. After the stainless steel plate 21 is fixed to forming dies 29 and 30, proper fluid such as water, oil, solvent and air is forcedly inputted from the opening 24 with a proper pressure. An expanding part 26 is formed along grooves 31 and 32 formed in the forming dies 29 and 30, a gas accumulation part 27 is formed so as to make a combustion device 20 having a gas blowing hole 25 at a proper position in the expanding part 26. In this way, it is possible to eliminate a cutting process, simplify a manufacturing procedure and then a less-expansive combustion device with high productivity can be manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing a combustor used in combustion equipment such as a power stove.

2. Description of the Related Art The conventional method for manufacturing a combustor is shown in Figures 8 to 10 below.
This will be explained with reference to the figures. 1 is a cast iron combustor,
It consists of a main body 2 and an upper lid 3.

The main body 2 has an annular shape with an open upper surface, and a gas inlet 4 is provided in a part of the annular shape. The oblique cylindrical upper end surface 6 of the main body 2 is inclined inward to allow the gas to flow upwardly and radially. The upper end surface 6 of the inner circular portion of the main body 2 and the inner circumferential surface 7 of the inner cylinder are cut to maintain airtightness with the upper lid 3. The upper lid 3 has a disk shape with a 68 in the center, and a wavy shape 1 is formed on the inclined part 10 of the outer peripheral end surface 9.
1 are formed radially around the entire circumference, and the wavy shape 11 is aligned with the oblique cylindrical upper end surface 6 of the main body 2 to form a gas blowing hole 12. Further, a cylindrical portion 13 is provided to fit into the inner circumferential surface 7 of the inner cylinder of the main body 2, and a gas hole 16 is provided at an appropriate position on the upper surface 14 of the upper lid 3.

A gas blowing hole 12 is formed by combining the oblique cylindrical upper end surface 6 of the main body 2 and the corrugated shape 11 of the upper lid 3.

In manufacturing this combustor, after manufacturing the main body 2 and the upper lid 3 by casting, the oblique cylindrical upper end surface 6 of the main body 2, the inner circular upper end surface 6, the inner peripheral surface 7 of the inner cylinder, and the cylindrical portion 13 of the upper lid 3 are manufactured. outer peripheral surface 1
6. A gas flow path 19 that is assembled after cutting the upper lid lower surface 17 and the upper lid outer peripheral end surface 9 to form a series of flow paths including the gas inlet 4, the gas hole 16, the gas blowout hole 12, and the gas reservoir 18.
This was done by forming a .

Problems to be Solved by the Invention However, in the above-described manufacturing method, since the material is made of cast iron, it is necessary to provide a hollow space such as a gas blowing hole 12 and a gas flow path 19 as shown in FIG. The structure of the combustor 1 has to be divided into the main body 2 and the upper cover 3, which increases the number of parts.

Furthermore, in assembling the main body 2 and the top cover 3, a part of the structure must be cut and assembled, so a cutting process is required and productivity is poor.

In view of the above-mentioned drawbacks, the present invention provides a method for manufacturing a combustor with high productivity in which the main body and the top cover are made into an integral bulge-molded structure, the number of parts is reduced, the cutting process is eliminated, and the process is simplified. This is what we provide.

Means for Solving the Problems In order to achieve this object, the combustor of the present invention consists of stacking a plurality of steel plates, leaving an opening at the outermost periphery of the steel plates, welding the entire periphery, and then A suitable fluid is added through the opening, pressure molding is performed to provide a bulging part, and gas blowing holes are opened at appropriate positions in the bulging part.

Function: This configuration makes it possible to integrate the main body and the top cover, which was not possible in the manufacturing of castings.This reduces the number of parts, and also eliminates the need to cut the castings into the required shape and assemble them during assembly. .

In other words, the cutting process can be eliminated, thereby simplifying the process9, and making it possible to produce a highly productive and inexpensive combustor.

EXAMPLE Hereinafter, a method for manufacturing a combustor according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a combustor in an embodiment of the present invention.

20 is a combustor, 21 is a stainless steel plate, 22 is the innermost periphery of the stainless steel plate 21, 23 is the outermost periphery of the stainless steel plate 21, 24 is an opening provided in the outermost periphery 23, 26 is a second
A gas blow-off hole is formed in the bulging portion 26 shown in the plan view of the recess, 27 is a gas reservoir shown in the second sectional view, and 28 is a welded portion by TIG welding.

The method for manufacturing the combustor 20 configured as described above is as follows.

First, two unformed stainless steel plates 21 are placed one on top of the other, and TIG welding, which is a type of arc welding, is performed to leave an opening 24 shown in FIG. 3 on the outermost periphery 23 of the stainless steel plate 21. The outer periphery 23 is welded. Next, after fixing the stainless steel plate 21 to the molding die 29, 30 shown in FIG. 6, a suitable fluid, such as water, oil, solvent, air, etc., is forced into the opening 24 at a suitable pressure. As shown in FIG. 6, the groove 3 provided in the molding die 29, 30
1.32, the bulging part 26 is bulged out, and the gas reservoir part 2
7, and the bulging portion 261C gas blow-off hole 26 is opened at an appropriate position as shown in FIG. 1 to manufacture a combustor 2o.

In this example, the innermost and outermost welding is done by TIG.
Although welding was used, other methods such as arc welding, laser welding, electron beam welding, seam welding, etc. are also possible.

Furthermore, in this embodiment, both of the two stainless steel plates 21 were expanded by expansion molding as shown in FIG. Extrusion molding is also possible. Furthermore, although a stainless steel plate was used as the material in this embodiment, it is also possible to perform expansion molding using other heat-resistant steel plates.

Effects of the Invention As described above, the present invention includes stacking a plurality of steel plates, leaving an opening at the outermost periphery of the steel plates, and welding the entire periphery,
After that, an appropriate fluid is added through the opening, a pressure-molded bulge is formed, and the bulge is provided with a gas outlet hole at an appropriate position. The previously formed gas flow path can be made into an integral structure, the number of parts can be reduced, and cutting of the casting can also be eliminated when assembling. Therefore, it is possible to shorten the process, resulting in high productivity and low cost.Furthermore, by changing the material from casting to stainless steel plate, weight can be reduced, which has a great practical effect. be.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a combustor in an embodiment of the present invention, FIG. 2 is a sectional view of FIG. 1, FIG. 3 is a plan view before molding, and FIG.
The figure is a partial cross-sectional view of a steel plate showing the state of joining of the stainless steel plates in the combustor manufacturing process, Figure 5 is a partial cross-sectional view showing the stainless steel plate placed in a molding die, and Figure 6 is a partial cross-sectional view of the stainless steel plate in the molding die. FIG. 7 is a partial sectional view of a stainless steel plate that has been bulged and molded using a mold different from that in FIG. 6; FIG. 8 is a plan view of a conventional cast iron combustor; 9 is a sectional view of the cast metal combustor shown in FIG. 8, and FIG. 10 is a side view of the combustor shown in FIG. 8. 2o... Combustor, 21... Stainless steel plate, 22... Innermost circumference, 23... Outermost circumference, 24... Opening. , 26...Gas blow-off hole, 26...Bulging part. Name of agent: Patent attorney Toshio Nakao and one other person? 4 Fig. 2 27--Case retaining part 21--Nuten νS--Fig. 6, Fig. 7, Fig. 9, ?

Claims (1)

[Claims] Layering multiple stainless steel plates or heat-resistant steel plates,
After welding the outermost and innermost peripheries of the steel plate, leaving one or more openings on the outermost periphery of the steel plate, and then press-fitting an appropriate fluid through the openings to form a bulge. . A method for manufacturing a combustor, characterized in that a hole is formed in the bulging portion to form a gas blowing hole.