JP3431849B2 - Burner structure of portable gas stove - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called outdoor portable gas stove, and more particularly to a burner structure for a portable gas stove.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a portable gas stove.
Generally, a portable gas stove 10 includes a gas cartridge 11 in which a combustible gas is compressed and packed, and a gas combustor 1 detachably attached to the gas cartridge 11.
It consists of 2. Gas cartridge 11 and gas combustor 12
Are attached under a state of being sealed via a gasket 13.

The gas combustor 12 is a gas cartridge 11
The instrument plug 14 through which the combustible gas supplied from the gas cartridge 11 passes, and the combustible gas that passes through the instrument plug 14 by adjusting the opening degree of the gas passage port formed inside the instrument plug 14. A gas flow rate adjusting spindle 15 for adjusting the flow rate of gas, a burner head 16 having a plurality of openings 16a formed on the surface, a mixing pipe 17 for connecting the instrument plug 14 and the burner head 16, and a mixing pipe 1
It is composed of a Gotoku 18 fixed to the No. 7 and extending above the burner head 16.

The combustible gas is loaded in the gas cartridge 11 in a pressurized state. Therefore, when the gas flow rate adjusting spindle 15 opens the gas passage inside the instrument plug 14, the combustible gas under pressure enters the instrument plug 14 from the gas cartridge 11. In this way, the combustible gas enters the mixing pipe 17 with the gas flow rate adjusted by the gas flow rate adjusting spindle 15. Mixing tube 17
A plurality of openings 17a (only one of which is shown in FIG. 5) are formed in the interior of the mixing pipe 17. Due to the negative pressure generated when the combustible gas passes through the inside of the mixing pipe 17, air outside the openings 17a is generated. Are taken into the mixing tube 17. The combustible gas mixes with the air taken in through the opening 17a and becomes a mixed gas of the combustible gas and the air.

After the mixed gas enters the burner head 16, it is ejected from the opening 16a and ignited by an electric igniter or other suitable means (not shown) arranged in the vicinity of the burner head 16. It

The mixed gas that is ignited and in a burning state becomes a flame to heat an object to be heated (pot, kettle, food, etc.) placed on the Gotoku 18.

In general, outdoor products are desired to be small, not limited to portable gas stoves. Speaking of portable gas stoves, gas cartridge 11
In order to secure a gas combustion time of a length that is not inconvenient for practical use, a certain amount of gas must be filled, and there is a limit to miniaturization. For this reason, the miniaturization of the portable gas stove is mainly achieved by the gas combustor 12, and in particular,
This is being advanced by downsizing the burner head 16.

However, if only the burner head 16 is downsized, the volume of the burner head 16 becomes relatively small with respect to the gas flow rate from the gas cartridge 11, so that the gas velocity of the mixed gas ejected from the opening 16a of the burner head 16 is small. May increase and the gas velocity of the mixed gas may exceed an appropriate gas burning velocity.

When the gas velocity of the mixed gas is equal to or lower than the gas burning velocity, the mixed gas burns completely. In this case, the flame originates from the outer surface of the burner head 16. On the other hand, when the gas velocity of the mixed gas becomes higher than the gas burning velocity, a so-called "lift" phenomenon occurs. The lift is a phenomenon in which the flame does not occur on the outer surface of the burner head 16 but occurs at a point some distance from the outer surface of the burner head 16. When the lift occurs, not all of the mixed gas is completely combusted, and a part of the mixed gas is ejected from the opening 16a of the burner head 16 in a state of incomplete combustion.

In order to solve such a problem, many solutions have been proposed, and FIG. 6 shows one of them, the burner structure described in JP-A-7-233948.

This burner structure has a substantially frusto-conical shape, a bottom surface is opened, and a plurality of openings 20a are formed in the side wall, and a through hole 21a into which the mixing tube 17 is inserted in the center. And a bottom plate 21 that closes the open bottom surface of the injection hole plate 20 and a gas outflow hole 22a in the center.
It is composed of a partition plate 22 having a frusto-conical shape which is substantially similar to that of 0.

The three plates of the injection hole plate 20, the bottom plate 21, and the partition plate 22 are caulked and fixed integrally by folding back the outer peripheral edge of the injection hole plate 20. The partition plate 22 is formed so that a gap 23 is formed between the partition plate 22 and the injection hole plate 20.
It is arranged with respect to 0.

The burner structure described in Japanese Patent Application Laid-Open No. 7-233948 shown in FIG. 6 has the following operation.

By combining the three plates of the injection hole plate 20, the bottom plate 21, and the partition plate 22, the bottom plate 21 and the partition plate 22 are combined.
A relatively large diffusion space 24 and a relatively narrow gap 23 between the partition plate 22 and the injection hole plate 20.

The mixed gas flowing out of the mixing pipe 17 first enters the diffusion space 24 and diffuses inside the diffusion space 24. As a result, the gas velocity of the mixed gas is reduced and the combustible gas is further mixed with air.

After that, the mixed gas in the diffusion space 24 enters the gap 23 from the gas outflow hole 22a of the partition plate 22, moves along the gap 23, and is ejected to the outside from the opening 20a of the injection hole plate 20.

By adjusting the size of the gas outflow hole 22a of the partition plate 22, the speed at which the mixed gas enters the gap 23 can be adjusted. That is, if the gas outflow hole 22a is enlarged, the gas velocity of the mixed gas increases, and if it is reduced, the gas velocity of the mixed gas decreases. The gas pressure of the mixed gas is made uniform while the mixed gas is moving inside the gap 23. Therefore, the mixed gas is uniformly ejected from all the openings 20a of the injection hole plate 20.

As described above, according to the burner structure disclosed in Japanese Patent Laid-Open No. 7-233948, the mixed gas first diffuses in the diffusion space 24, so that the gas velocity decreases, and thereafter the pressure in the gap 23 decreases. Is homogenized, the ejection speed of the mixed gas ejected from the opening 20a further decreases and approaches an appropriate combustion speed. For this reason, the ejection of the mixed gas in the unburned state is eliminated.

[0019]

[Patent Document 1] Japanese Patent Application Laid-Open No. 7-23394
The burner structure described in Japanese Patent Publication No. 8 reduces the gas velocity of the mixed gas on the assumption that the mixed gas flowing out of the mixing pipe 17 diffuses in the diffusion space 24.

However, the gas outflow hole 22a provided in the partition plate 22 is located in front of the open end of the mixing pipe 17, and the mixed gas flowing out from the mixing pipe 17 is in the axial direction of the mixing pipe 17. Has a great speed.
Therefore, actually, the mixed gas flowing out from the mixing pipe 17 directly flows out into the gap 23 from the gas outflow hole 22a. That is, the mixed gas does not diffuse in the diffusion space 24 and directly flows into the gap 23.

Therefore, even with the burner structure described in Japanese Patent Laid-Open No. 7-233948, it is not possible to reduce the speed of the mixed gas to a desired speed when the burner structure is downsized, and the burner structure is still in an unburned state. The problem of spouting mixed gas has not been completely solved.

The present invention has been made in view of the above problems in the conventional burner structure of a portable gas stove, and surely reduces the velocity of a mixed gas of combustible gas and air to an appropriate burning velocity, An object of the present invention is to provide a burner structure that can prevent the mixed gas from being released to the outside in an unburned state.

[0023]

In order to achieve this object, the first aspect of the present invention is to provide a mixing tube having an open end from which a mixed gas of combustible gas and air is discharged, a mixing tube having a constant volume, and a bottom surface. A burner head which is open and has at least one opening on the surface, and a through hole into which the mixing tube can be inserted,
A bottom plate covering the open bottom surface of the burner head,
In the burner structure of the portable gas stove consisting of, the burner head has a concave portion formed in a concave shape with respect to the mixing tube in a region facing the mixing tube.
The concave portion is hemispherical or conical.
A feature is a burner structure for a portable gas stove .

[0024]

[0025]

[0026]

First, the mixed gas discharged from the mixing pipe collides with the recess formed in the burner head. In order for the mixed gas to collide with the recess, the mixed gas will travel a longer distance. Therefore, the gas velocity of the mixed gas decreases to some extent during this traveling. Next, the mixed gas collides with the recess of the burner head, whereby the mixed gas is dispersed almost evenly around the recess, and the gas velocity of the mixed gas is significantly reduced. After this, the mixed gas is discharged to the outside through an opening provided in the burner head. At this point in time, the gas velocity of the mixed gas has decreased to an almost proper gas combustion velocity. Therefore, the mixed gas appropriately burns outside the burner head without causing lift. As described in claim 2, in the burner structure of the portable gas stove according to the present invention,
An inner cup attached to the top of the inner surface of the burner head may be further provided, and the inner cup may be provided with a recess.

Instead of forming a recess in the burner head, a recess may be provided in the inner cup.
The same effect as that of the first aspect can be obtained.

[0029]

The shape of the recess formed in the burner head or the inner cup is not limited to a particular shape. Any shape can be selected as long as the mixed gas collides with the recess to reduce the gas velocity thereof and further disperse the gas almost evenly around the recess.

However, from this point of view, the most suitable shape of the concave portion is a hemispherical shape or a conical shape as described in claim 1.

[0032]

1 shows a first embodiment of a burner structure for a portable gas stove according to the present invention.

The burner structure of the portable gas stove according to the first embodiment has a cylindrical mixing tube 30 having an open end 30a through which a mixed gas of combustible gas and air is discharged, and a bottom surface is opened and a side surface is provided. The burner head 31 has a frustoconical burner head 31 having a plurality of openings 31a and a through hole 32a into which the mixing tube 30 can be inserted.
Bottom plate 32 covering the open bottom surface of the burner head, an inner cup 33 attached to the top of the inner surface of the burner head 31, and a windshield that spreads around the burner head 31 and has a predetermined height from the bottom of the burner head 31. 34,
Is equipped with.

The bottom plate 32 has a central portion 32b that spreads in a disk shape around the through hole 32a, an inclined portion 32c that extends obliquely outward and downward from the central portion 32b, and an inclined portion 32c.
32d that extends in a ring shape on the outside of the
It consists of The bottom plate 32 is bent along the lower end of the burner head 31 at the outer edge portion 32d, whereby the bottom plate 32 and the burner head 31 are connected.

The windshield 34 has an opening at the center thereof, and has a first portion 34a extending in a disk shape around the opening, and an inclined portion 34b extending obliquely outward and downward from the first portion 34a.
And a second portion 34c that extends outward in a ring shape from the inclined portion 34b and an outer peripheral portion 34d that extends obliquely outward and upward from the second portion 34c. The windshield 34 is fixed to the bottom surface of the central portion 32b of the bottom plate 32 and the outer edge portion 32d at the first portion 34a and the second portion 34c thereof.

The inner cup 33 attached to the top of the inner surface of the burner head 31 has a convex portion 33a formed in a convex shape with respect to the mixing tube 30 in a region facing the open end 30a of the mixing tube 30. An annular portion 33b that extends in a ring shape from the convex portion 33a to the outside, and a bent portion 33c that is bent outward and obliquely downward on the outside of the annular portion 33b.

In this embodiment, the convex portion 33a is formed in a hemispherical shape.

The burner structure according to this embodiment operates as follows.

The mixed gas discharged from the open end 30a of the mixing pipe 30 first collides with the convex portion 33a of the inner cup 33. This collision reduces the gas velocity of the mixed gas. In addition, the mixed gas is evenly dispersed around the convex portion 33a.

Next, the mixed gas, which is dispersed almost evenly around the convex portion 33a, collides with the annular portion 33b of the inner cup 33. The second collision with the annular portion 33b further reduces the gas velocity of the mixed gas.

After that, the mixed gas is guided to the bent portion 33c of the inner cup 33 and is discharged to the outside from the opening 31a formed in the side surface of the burner head 31.
At this point in time, the gas velocity of the mixed gas has decreased to an almost proper gas combustion velocity. Therefore, the mixed gas is ignited outside the burner head 31 via an appropriate igniting means (not shown), and is properly combusted without causing lift.

In this embodiment, the inner cup 3
Although the convex portion 33a of No. 3 is formed in a hemispherical shape,
The shape of a is not limited to a hemispherical shape. When the mixed gas collides with the convex portion, the gas velocity is reduced,
Further, any shape can be selected as long as it has a shape in which it is dispersed almost evenly around the convex portion. For example, a conical shape, a parabolic shape, a truncated cone shape, or the like can be selected as the shape of the convex portion 33a.

FIG. 2 shows a second embodiment of the burner structure of the portable gas stove according to the present invention. In addition, the same components as those in the first embodiment will be represented by the same reference numerals.

In the burner structure according to this embodiment, the burner head 31 itself has a protrusion 31b similar to the protrusion 33a in the first embodiment. Therefore, in this embodiment, the convex portion 33a is not formed on the inner cup 33, and instead, the opening 3 through which the convex portion 31b penetrates in the center of the inner cup 33.
3d is formed. The structure other than these is the same as the burner structure according to the first embodiment.

By providing the convex portion 31b on the burner head 31 instead of the inner cup 33 as in the present embodiment, the same operation as in the above-described first embodiment can be obtained.

In this embodiment, the inner cup 33 does not necessarily have to be provided.

FIG. 3 shows a third embodiment of the burner structure of the portable gas stove according to the present invention. In addition, the same components as those in the first embodiment will be represented by the same reference numerals.

In the burner structure according to the present embodiment, the inner cup 33 has the open end 30 of the mixing tube 30.
In a region facing a, a concave portion 33e formed in a concave shape with respect to the mixing tube 30 is formed instead of the convex portion 33a in the first embodiment. This recess 33e
Can also be said to be a convex portion protruding in a direction away from the mixing tube 30.

An opening 31 is provided at the center of the burner head 31.
c is formed, and the concave portion 33e of the inner cup 33 is formed.
Project outward from the opening 31c. Recess 33e of inner cup 33 and opening 31c of burner head 31
The other structure is the same as the burner structure according to the first embodiment.

The burner structure according to this embodiment operates as follows.

First, the mixed gas discharged from the open end 30a of the mixing tube 30 collides with the recess 33e formed in the inner cup 33. Compared with the case where the convex portion 33a is formed on the inner cup 33 or the convex portion 31b is formed on the burner head 31 as in the first embodiment or the second embodiment, the mixed gas is The mixed gas travels a longer distance before colliding with the recess 33e.

Therefore, the gas velocity of the mixed gas decreases to some extent during this traveling. Next, the mixed gas collides with the recess 33e of the inner cup 33, so that the mixed gas is dispersed almost evenly around the recess 33e, and
The gas velocity of the mixed gas is significantly reduced.

Thereafter, the mixed gas is guided to the bent portion 33c of the inner cup 33, and is discharged to the outside from the opening 31a formed in the side surface of the burner head 31.
At this point in time, the gas velocity of the mixed gas has decreased to an almost proper gas combustion velocity. Therefore, the mixed gas is ignited outside the burner head 31 via an appropriate igniting means (not shown), and is properly combusted without causing lift.

FIG. 4 shows a fourth embodiment of the burner structure of the portable gas stove according to the present invention. In addition, the same components as those in the first embodiment will be represented by the same reference numerals.

In the burner structure according to the present embodiment, the burner head 31 itself has a recess 31d similar to the recess 33e in the third embodiment. Therefore, in the present embodiment, the inner cup 33 is not provided with the recess 33e, and instead, the opening 3 is formed in the center of the inner cup 33 so as to face the recess 31d.
3d is formed. The structure other than these is the same as the burner structure according to the first embodiment.

By providing the recess 31d in the burner head 31 instead of the inner cup 33 as in the present embodiment, the same effect as in the third embodiment can be obtained.

As in the case of the second embodiment, it is not always necessary to provide the inner cup 33 also in this embodiment.

[0058]

As described above, according to the burner structure of the portable gas stove according to the present invention, the mixed gas discharged from the mixing pipe collides with the convex portion or the concave portion formed on the burner head or the inner cup. As a result, the gas velocity of the mixed gas is reduced, and the mixed gas is substantially evenly distributed around the convex portion or the concave portion. After this, the mixed gas is discharged to the outside through an opening provided in the burner head. At this point in time, the gas velocity of the mixed gas has decreased to an almost proper gas combustion velocity, so that the mixed gas properly burns outside the burner head without causing lift.

[Brief description of drawings]

FIG. 1 is a sectional view of a burner structure of a portable gas stove according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a burner structure of a portable gas stove according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a burner structure of a portable gas stove according to a third embodiment of the present invention.

FIG. 4 is a sectional view of a burner structure of a portable gas stove according to a fourth embodiment of the present invention.

FIG. 5 is a front view of a general gas stove.

FIG. 6 is a cross-sectional view of a conventional burner structure.

[Explanation of symbols]

10 Portable gas stove 11 gas cartridges 12 gas combustor 13 gasket 14 Instrument stopper 15 Gas flow rate adjusting spindle 16 burner head 17 Mixing tube 18 Gotoku 20 nozzle plate 21 Bottom plate 22 Partition board 23 Gap 24 diffusion space 30 mixing tubes 31 burner head 31a opening 31b convex part 31c opening 31d recess 32 Bottom plate 33 Inner cup 33a convex part 33e recess 34 Windshield

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F23D 14/06 F23D 14/28 F24C 3/08 F24C 3/14

Claims (2)

(57) [Claims] 1. A mixing tube having an open end from which a mixed gas of combustible gas and air is discharged; a burner head having a constant volume, an open bottom surface, and at least one opening on the surface; has a through hole capable of inserting the mixing tube, wherein a bottom plate for covering the opening to have the bottom surface of the burner head, the burner structure of a portable gas cooking stove comprising a said burner head is in a region facing the mixing tube, wherein Provided with a concave part that is concave with respect to the mixing tube.
The recess is hemispherical or conical in shape.
Portable gas stove burner structure . 2. The portable gas stove according to claim 1, further comprising an inner cup attached to the top of the inner surface of the burner head, wherein the recess is formed in the inner cup. Burner structure.