JP3836958B2 - Burner cap manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention provides a stove burner, a method of manufacturing a Banakya' flops used is placed on the burner body which is integrally formed on the tip portion of the mixing tube.
[0002]
[Prior art]
Conventional burner caps of this type and their manufacturing methods include, for example, Japanese Patent Publication No. 7-54166 (hereinafter simply referred to as Conventional Example 1), Japanese Patent Laid-Open No. 8-200265 (hereinafter simply referred to as Conventional Example 2), and the like. .
[0003]
The burner cap of the conventional example 1 is in a semi-finished product state (see FIG. 11 and FIG. 3 of the conventional example 1) as shown in FIGS. ) Has a circular secondary air hole 4 in the center and a large number of flame holes 14 in the periphery, and an outer diameter located above the main body 21 is larger than that of the secondary air hole 4. And the shielding part 16 located at the upper end of the projecting part 15 at the upper part of the secondary air hole 4, projecting inwardly on the inner surface of the projecting part 15 and connecting the main body part 21 and the shielding part 16 to each other. Convex portions 18 are provided continuously, and these are integrally formed by forging, casting or the like. At this time, the outer diameter φA of the protrusion 15, the diameter φB of the secondary air hole 4, and the inner diameter φC connecting the inner diameters of the plurality of protrusions 18 are related by φA>φB> φC. It is molded with.
[0004]
Next, the secondary air passage formed when the outer peripheral wall 19 of the projecting portion 15 of the semi-finished product is completely removed from the outer peripheral wall 19 while leaving the shielding portion 16 on the tip side (dotted line portion in FIG. 12). The inner diameter φD is cut and removed (see FIG. 12), and the secondary air flow passage 5 is formed between the shielding portion 16 and the main body portion 21 (see FIG. 13 and FIG. 4 of the conventional example 1). . That is, the shielding portion 16 is connected to the main body portion 21 by a plurality of convex portions 18, and the secondary air flow passage 5 is formed between the plurality of convex portions 18.
[0005]
Therefore, the burner cap of Conventional Example 1 connects the main body portion 21 and the shielding portion 16 with a plurality of convex portions (supports) 18 that project inward toward the inner periphery of the shielding portion 16 and are integrally formed with the main body portion 21. It is integrated.
In the above description, the explanation terms of Conventional Example 1 are used as they are, and the reference numerals used in the explanation and drawings are used as they are.
[0006]
Next, the burner cap of the conventional example 2 is in a state of a semi-finished product (see FIG. 14 and the fourth example of the conventional example 2) as shown in FIGS. in FIG see), the hollow body portion 20 of the substantially domed cover the inner opening ₈₁ on one side of the main body 8 is provided continuously, the other surface has a shape in which the cylindrical portion 9 is continuously provided, the hollow body portion 20 includes an end wall 22 that becomes a cap portion 12 integrated with a cylindrical wall portion 21, and ribs 23 that become pillars 11 at three locations on the outer peripheral surface extending from the end wall 22 to the cylindrical wall portion 21 in the vertical direction. It is a forged product formed as
[0007]
Next, the secondary air outlet 13 is opened in the semi-finished product and the outer surface of the rib 23 or the outer peripheral surface of the main body 8 is chucked as shown in FIG. When the boring tool is inserted from the cylindrical portion 9 side and the cut portion (dotted line portion in FIG. 15) is bored (see FIG. 15 and FIG. 4 of the conventional example 2), the secondary air outlet 13 is opened. The end wall 22 remains as the shade portion 12, and the three ribs 23 connected to the shade portion 12 remain as the support 11 integrally with the main portion 8, and the support 11 protrudes outside the shade 12. It has a structure (see FIG. 16 and FIG. 3 of Conventional Example 2).
[0008]
Therefore, the burner cap of Conventional Example 2 integrally connects the main body portion 8 and the cap portion 12 with a plurality of support columns 11 that protrude outwardly outward of the outer periphery of the cap portion 12 and are integrally formed with the main portion 8. .
In the above description, the explanation terms of Conventional Example 2 are used as they are, and the reference numerals used in the explanations and drawings are used as they are.
[0009]
[Problems to be solved by the invention]
However, in both of the conventional examples 1 and 2 described above, a plurality of support columns are formed at the secondary air outlet so as to protrude toward the inner periphery or the outer periphery of the lid, so that the air from the secondary air hole is at the outlet. The distribution of the secondary air is obstructed by a plurality of support columns and is not uniformly supplied to each part of the outer flame mouth and the inner flame mouth.
In addition, since the plurality of support columns are formed so as to protrude inward or outward of the outer periphery of the lid body, the appearance is poor and the product value is undesirably deteriorated in appearance.
Furthermore, since the length of the core pin used at the time of forging for forming the semi-finished product is deeply formed up to the umbrella portion (l dimension in FIG. 11), the length of the core pin becomes extremely long. The shape of the tip portion of the core pin is complicated because it is necessary to mold the convex portion 18 projecting toward the upper side, and in the conventional example 2, it is necessary to mold the rib 23 projecting outward from the upper die. Since the shape is complicated, the processing becomes difficult and the processing cost increases.
There were problems such as.
[0010]
Air to the manufacturing method of Banakya' flop will solve the above problems, the central secondary upper distribution of combustion secondary air from the air holes may to the outer flame port of the main flame and inner flame port of the auxiliary flame of the invention The supply cost is made uniform, the ruggedness of the support is eliminated, the aesthetics are improved, and the length of the core pin is shortened to almost half that of the conventional one. The purpose is to make it cheaper.
[0011]
[Means for Solving the Problems]
The method for manufacturing a burner cap according to claim 1 of the present invention for solving the above-described problems is as follows .
A cap main body having a plurality of flame mouth grooves radially forming an outer flame mouth on the peripheral lower surface, having an inner opening at the center, and having an inner flame mouth at a plurality of locations between the flame mouth groove and the inner opening, A cylindrical portion that extends downward from the inner opening of the cap main body to form a secondary air hole, a diametrical support rod formed at the inner opening of the cap main body, and a column and an umbrella are formed above the inner opening. A first step of integrally forming a semi-finished product having a convex portion;
The cutting portion of the convex portion is cut and removed from the outer periphery, leaving the column and the umbrella, and the column is formed upright in the center portion of the support rod, and the secondary in a fully open state leading to the secondary air hole And a second step of forming an air outlet.
[ 0012 ]
The method for manufacturing a burner cap according to claim 1 of the present invention having the above-described configuration is to form a semi-finished product integrally by forging or the like, and then connect to the secondary air hole only by cutting and removing the cut portion of the convex portion. The secondary air outlet in the open state is formed, and at the same time, the support column and the umbrella body remain and are integrally formed. As a result, the desired burner cap can be produced by only two processes, that is, the production of a semi-finished product by forging and the cutting and removal processing of the convex portion by a lathe, and the core pin is short, Its simple shape makes it easy to manufacture.
[ 0013 ]
DETAILED DESCRIPTION OF THE INVENTION
In order to further clarify the configuration and operation of the present invention described above, preferred embodiments of the burner cap and the manufacturing method thereof according to the present invention will be described below with reference to the drawings.
[ 0014 ]
1 to 10, FIG. 1 shows an example of a stove burner used for a gas table or the like. The stove burner includes a burner body 1 and a burner cap 2 for supplying a mixed gas. 1 is provided with a mixing tube 3 and a loop-shaped mixing chamber 4 opened upward, and further provided with a center hole 5 and a mounting surface 6 on the outer periphery of the upper surface, covering the loop-shaped mixing chamber 4 and a burner. A large number of external flame openings 7 are formed on the outer peripheral surface by placing the cap 2. In the figure, 8 is a thermocouple for detecting a burner flame. Further, 20 is an air conditioner provided at the base end widening portion of the mixing tube 3, and 21 is a main gas nozzle.
[ 0015 ]
As shown in FIGS. 2 to 4, the burner cap 2 extends downward from the disc-shaped cap main body 9 and the inner opening 10 bored at the center of the cap main body 9, together with the inner opening 10. A cylindrical portion 12 forming a secondary air hole 11 and an umbrella body 14 connected and supported by a single column 13 extending upward from the center of the inner opening 10 of the cap main body 9. Covering the air hole 11 prevents the broth from falling into the secondary air hole 11, and the entire circumference is in an open state with a certain distance between the umbrella body 14 and the cap main body 9. A secondary air outlet 15 is formed.
[ 0016 ]
A large number of flaming grooves 16 that form the external flame mouth 7 are formed radially on the lower peripheral surface of the cap main body 9, and these are stacked on the placement surface 6 of the burner body 1 to be placed on the flame throat groove 16. An outer flame mouth 7 is formed with the mounting surface 6, and an inner flame mouth 17 is provided at a plurality of positions between the flame mouth groove 16 and the inner opening 10.
[ 0017 ]
A fitting portion 19 is formed in the lower end portion of the cylindrical portion 12 of the cap main body 9 so as to be airtightly fitted into the center support hole 18 of the burner body 1, and when the burner cap 2 is placed on the burner body 1, the burner body The flame opening groove 16 of the burner cap 2 is overlapped with the mounting surface 1 of 1 and simultaneously the fitting portion 19 of the burner cap 2 is tightly fitted into the center support hole 18 of the burner body 1 and set.
[ 0018 ]
When the burner cap 2 is manufactured, first, a semi-finished product is produced by forging, and then a secondary air outlet 15 is formed by leaving a support column 13 and an umbrella body 14 by cutting with a lathe. That is, as shown in FIG. 5 to FIG. 7, the semi-finished product by forging has a large number of flame opening grooves 16 for forming the outer flame opening 7 on the lower surface of the peripheral edge and has an inner opening at the center. 10, a cap main body 9 provided with internal flame openings 17 at a plurality of locations between the flame opening groove 16 and the inner opening 10, and a secondary air hole 11 extending downward from the inner opening 10 of the cap main body 9. A cylindrical portion 12 to be formed, a diametrical support rod 22 formed in the inner opening 10 of the cap main body 9, a secondary air outlet 15, a column 13 and an umbrella body communicating with the secondary air hole 11 at the upper portion of the inner opening 10. And a convex portion 23 for forming 14 (see FIG. 5). In addition, since the core pin 25 only forms the secondary air hole 11 and the support rod 22 leaving the convex part 23 at the time of forging, the length l may be short. The support rod 22 is integrally formed at the time of forging by a forming groove 26 formed on the upper end surface of the core pin 25.
[ 0019 ]
When the semi-finished product A formed in this way is then cut by a lathe and a predetermined cutting portion 27 of the convex portion 23 is cut and removed from the outer periphery with a cutting tool, the support column 13 is erected at the center of the support rod 22. The umbrella body 14 is formed integrally with the upper end of the support column 13 so as to cover the secondary air hole 11, and the entire circumference is opened between the umbrella body 14 and the cap main body 9. A secondary air outlet 15 is formed (see FIGS. 6 and 7). In addition, the cutting opening of the secondary air outlet 15 is surely performed by cutting only the thickness W ₂ slightly exceeding the thickness W ₁ of the convex portion 23 in the cutting portion 27 at the time of the cutting, which is beneficial in practice. Moreover, the fitting part 19 of the cylindrical part 12 is also cut with a cutting tool.
[ 0020 ]
8 to 10 show the support rod 22 made wider than the outer diameter of the support column 13 to increase the support strength, but the semi-finished product is produced by forging (see the figure). ) To leave the support column 13 and the umbrella body 14 (see FIGS. 9 and 10), the same reference numerals are given to the same parts as those of the embodiment shown in FIGS. Omitted.
[ 0021 ]
In the above configuration, since the secondary air outlet 15 is in an open state all around, the distribution of the secondary air for combustion from the secondary air holes 11 is improved (see the arrows in FIGS. 1 and 4), and the external flame The supply of air to the upper side of the main flame a of the mouth 7 and the auxiliary flame b of the inner flame mouth 17 is made uniform.
Moreover, since the support | pillar 13 which supports the umbrella body 14 is located in the center, it is hidden with the umbrella body 14, and the appearance on the exterior is good.
Furthermore, the length l of the core pin 25 may be short and the shape thereof can be simplified, so that forging is easy.
[ 0022 ]
Although an example of an embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and can of course be implemented in various forms without departing from the gist of the present invention. .
For example, in the present embodiment, it has been described that a semi-finished product is made by forging. However, the present invention is not limited to forging, but can be made by various kinds of integral forming means such as casting and sintering.
[ 0023 ]
【The invention's effect】
The present invention is implemented in the form as described above, and has the effects described below.
[ 0024 ]
According to the burner cap manufacturing method of the first aspect of the present invention, after the semi-finished product is integrally formed by forging or the like, the predetermined cutting portion of the convex portion is removed by cutting with a lathe, so that the secondary air Since the secondary air outlet with the entire circumference open to the hole is formed, the strut and the umbrella are also integrally formed, so the desired burner cap can be manufactured only by creating a forged product and simple cutting, especially The core pin at the time of forging is short, and since it has a simple shape, its manufacture is easy and mass production of a uniform product is possible, and its productivity is remarkably improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of a use state of a burner cap of the present invention.
FIG. 2 is a partially cutaway elevation view of a burner cap.
FIG. 3 is a plan view of the same part cutout.
4 is a cross-sectional view taken along the line XX of FIG.
FIG. 5 is a sectional view of a semi-finished product and a perspective view of a core pin.
FIG. 6 is a cross-sectional view showing a cutting state.
FIG. 7 is a cross-sectional view of a finished product.
FIG. 8 is a cross-sectional view of a semi-finished product when the support rod is wider than the support post.
FIG. 9 is a cross-sectional view of the cutting state.
FIG. 10 is a sectional view of the finished product.
FIG. 11 is a cross-sectional view of a semi-finished product showing the processing order of Conventional Example 1 in correspondence with the present invention.
FIG. 12 is a sectional view of the cutting state.
FIG. 13 is a sectional view of a finished product.
FIG. 14 is a cross-sectional view of a semi-finished product showing the processing sequence of Conventional Example 2 in correspondence with the present invention.
FIG. 15 is a sectional view of the cutting state.
FIG. 16 is a cross-sectional view of the finished product.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 2 ... Burner cap, 7 ... Outer flame opening, 9 ... Cap main body, 10 ... Inner opening, 11 ... Secondary air hole, 12 ... Cylindrical part, 13 ... Support | pillar, 14 ... Umbrella body, 15 ... Secondary air outlet, 16 ... flame groove, 17 ... inner flame opening, 22 ... support rod, 23 ... convex part, 27 ... cutting part.

Claims (1)

A cap main body having a plurality of flame mouth grooves radially forming an outer flame mouth on the peripheral lower surface, having an inner opening at the center, and having an inner flame mouth at a plurality of locations between the flame mouth groove and the inner opening,
A cylindrical portion that extends downward from the inner opening of the cap main body to form a secondary air hole;
A first step of integrally molding a semi-finished product having a support rod in a diametrical direction formed in the inner opening of the cap main body and a convex part forming a support and an umbrella on the upper part of the inner opening;
The cutting portion of the convex portion is cut and removed from the outer periphery, leaving the column and the umbrella, and the column is formed upright in the center portion of the support rod, and the secondary in a fully open state leading to the secondary air hole A method for producing a burner cap, comprising: a second step of forming an air outlet.

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