JP3358425B2 - Flame hole member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame hole member for forming a flame hole of a burner used for a burning appliance such as a water heater.

[0002]

2. Description of the Related Art In a conventional gas burner used for a water heater or the like, a type in which a flame hole member is formed separately from a burner body and the flame hole member is mounted on the burner body is used. Are known. Particularly, in the burner of the light-and-dark combustion method manufactured by pressing a metal plate, which is recently used, the structure is more complicated than that of a burner of a general Bunsen combustion method. As described above, it is advantageous in terms of manufacturing that the flame hole member is formed separately from the burner body.

[0003] As shown in FIG.
Several strip-shaped metal plates each having a convex portion or a concave portion are overlapped to form a gap serving as a gas flow path between the metal plates.

[0004]

In this conventional flame hole member, constrictions 101 and 102 exist to form the above-mentioned gap and also to define the flame hole. The flames formed by the members are constricted portions 101, 1
02 and the flames 103, 104,
A flame is formed every 105 steps apart.

[0005] As described above, when flames are formed at a certain distance or more, mutual flame holding action of adjacent flames cannot be expected. When the balance with the speed is lost and the flame becomes full of lift, this cannot be suppressed, and there is a problem that the flame falls into oscillating combustion that repeats vertical movement.

[0006] The constriction can be shortened by reducing the thickness of the metal plate. However, in this case, there is a problem in durability of the flame hole member.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides a flame hole member capable of improving the stability of individual flames by enhancing the mutual flame holding action of the flames and making vibration combustion less likely to occur. Aim.

[0008]

In order to achieve the above object, a flame hole member according to the present invention comprises a plurality of strip-shaped metal plates having a convex portion or a concave portion stacked on each other to form a gas flow path between the metal plates. In the flame hole member formed with a gap, a pair of metal plates located on the innermost side of the superposed metal plates are provided with a number of convex portions at the top, respectively, and the convex portions of both metal plates are mutually connected. The two metal plates are brought into contact with each other to define a gap between the two metal plates, and an appropriate number or all of the convex portions of the pair of metal plates are provided with notches extending from the upper end to below the convex portions.

The innermost pair of metal plates are overlapped with each other by contacting the projections provided on the uppermost portions, and the portion where the two metal plates are not in contact is a gas flow path. The upper end of the gas flow path is defined by the abutting portions of the projections, and forms a number of main flame holes.

The cutouts provided in an appropriate number or all of the large number of convex portions provided on the upper portion of the metal plate reach the lower portion of the convex portion, that is, the gap between the two metal plates serving as the gas flow paths. Flows into the notch and gushes from the upper end.
The gas ejected from the upper end of the notch forms a small flame between the flames of the main flame holes defined by the abutting portions of the convex portions, and the small flames form the main flame holes on both sides thereof. The flames come into contact with the bases of the flames, so that the flames have a mutual flame holding action.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partial plan view showing an embodiment of a flame hole member of the present invention, and FIG. 2 is a partial perspective view. The flame hole member 1 has six strip-shaped metal plates. It is superimposed. Each metal plate is provided with a large number of irregularities, and a gap formed between the metal plates forms a gas flow path. The upper end of the gas flow path is defined by constrictions 21, 22, 23, and 24. Two types of large and small flame holes (main flame holes), that is, large flame holes 31, 33, and 35, and smaller. Flame hole 3
2, 34 are alternately formed.

FIG. 3 shows a cross section of the flame hole 32. A pair of innermost metal plates 1A and 1B are provided with a gas flow by contacting upper convex portions 41A and 41B with each other. A path 42 is formed. Further, a pair of outer metal plates 1C and 1D are connected to an inner metal plate 1A,
1B, and projecting portions 4 that narrow the flow paths near the upper ends of the gas flow paths 43, 44.
5 and 46 are provided. The protrusions 45 and 46 are provided only in the small flame holes 32 and 34, and are provided in the large flame holes 3 and 34.
1, 33 and 35 are not provided.

Further, in this embodiment, through holes communicating between the gas passages 43, 44 and the gaps 47, 48 formed between the metal plates 1C, 1D and the outermost metal plates 1E, 1F. 49 and 50 are provided.

As shown in FIG. 4, the upper ends of the four inner metal plates 1A, 1B, 1C, and 1D abut at the center of the constricted portion 22, but a pair of innermost metal plates 1A, 1B is provided with notches 51, 52 cut below the upper convex portions 41A, 41B.
The reference numeral 51 communicates with the gas flow path 42 and also communicates with the gas flow paths 43 and 44, respectively. The constrictions 21 and 23 also have cutouts 51 and 52, respectively.
Does not have notches 51 and 52, as shown in FIG.
A connection portion 53 for connecting the metal plate 1A and the metal plate 1C and a connection portion 54 for connecting the metal plate 1B and the metal plate 1D are provided. At the lower end, a connecting portion 55 for connecting the metal plate 1A and the metal plate 1B is formed.
A connecting portion 56 for connecting E and a connecting portion 57 for connecting the metal plate 1D and the metal plate 1F are also provided. The six metal plates are connected by these connecting portions 53, 54, 55, 56, and 57. Have been.

By connecting the six metal plates in this way, the metal plates can be folded at the connection portion and the metal plates can be stacked one on another without the metal plates falling apart during manufacturing. There is an effect that the position to be overlapped is not shifted and the assembling becomes easy.

FIG. 6 shows an example in which the flame hole member 1 is mounted on a burner 10 of a light and shade combustion type. The flame hole member 1 is used for ejecting and burning a light mixed gas. Burner 1
7, a rich mixed gas chamber 11 is disposed on the left and right of the combustion pipe main body 12 around the combustion pipe main body 12 as shown in FIGS.
The flame hole member 1 is mounted between them.

The fuel gas supplied from a gas nozzle (not shown) facing the gas inlet 13 of the combustion tube body 12 and the surrounding air are mixed in the combustion tube body 12 to form a rich mixed gas having an excess air ratio of less than 1. In the section having the concave portion 19 as shown in FIG. 7, the rich mixed gas is sent to the rich mixed gas chamber 11 through the through hole 17, and the rich mixed gas flame hole 2 is formed.
Erupts from and forms a flame.

As shown in FIG. 8, in the cross section without the concave portion 19, there is a gap between the combustion pipe main body 12 and the rich mixed gas chamber 11, and the rich mixed gas ejected from the hole 16 flows through the lower opening 16 through the opening 16. The mixed gas is mixed with the introduced air to form a light mixed gas having an excess air ratio exceeding 1, flows through the light mixed gas passage 15, and is supplied to the flame hole member 1.

As shown in FIG. 3, the gas supplied from the light mixed gas passage 15 is supplied to the gas passages 42, 43,
It blows out from the upper end through 44 and forms a flame. Also,
Part of the gas flowing through the gas flow paths 43 and 44 is
The gas is ejected from the upper ends of the gaps 47 and 48 through 50, and the ejection speed is slower than the gas ejected from the upper ends of the gas flow paths 42, 43 and 44, and a flame having excellent lift resistance is formed. Thus, each of the flame holes 31, 32, 33, 3
A main flame is formed at 4,35.

On the other hand, in the constrictions 21, 22, and 23, FIG.
, Four inner metal plates 1A, 1B, 1C, 1D
Are in contact with each other at the center, but notches 51, 52 provided in the innermost pair of metal plates 1A, 1B
Since the gas reaches below 1A and 41B, the gas passing through the gas flow paths 43 and 44 flows through the cutouts 51 and 52 and gushes from the upper end, forming a small flame having a low flow velocity.

As shown in FIG. 9, the flame formed on the flame hole member 1 forms small flame images of the narrow portions 21, 22, and 23 between the flames of the flame hole portions 31, 32, 33, 34, and 35. When the small flames come into contact with the bases of the main flames on both sides, a mutual flame holding action between the flames is generated, and the vibration of the flame due to disturbance can be suppressed.

In this embodiment, the stenosis portion 24 includes
As described above, since the connecting portions 53 and 54 are provided, there is no notch and no small flame is formed.
The embodiments 3 and 54 need not necessarily be provided, and an embodiment in which notches are provided in all constrictions to form a small flame may be used.

Further, in the present embodiment, the large flame hole 3
By alternately arranging 1, 33, 35 and small flame holes 32, 34, it is advantageous for preventing the flame hole member 1 from overheating. That is, in the relationship between the heat capacity of the metal plate and the amount of combustion, the small flame holes 32, 34 are larger than the large flame holes 31,
33, 35, its smaller flame holes 32,
Since 34 is located between the large flame holes 31, 33, 35, it is easy to prevent burns of the flame holes.

In the small flame holes 32, 34,
As shown in FIG. 3, the protrusions 45 provided on the metal plates 1C and 1D,
46 narrows the flow path near the upper ends of the gas flow paths 43 and 44, so that the amount of gas ejected from the upper ends of the gas flow paths 43 and 44 is reduced, and the through holes provided below the protrusions 45 and 46 are provided. It has the effect of increasing the amount of gas flowing to 49,50. Accordingly, the amount of gas ejected from the upper ends of the gaps 47 and 48 can be appropriately secured, and the ejection speed from the upper ends of the gas passages 43 and 44 can be reduced, and the height of the flame can be suppressed. By suppressing the height of the flame, the amplitude of the vertical movement of the flame due to disturbance is reduced, and the flame resistance of the small flame holes 32 and 34 is improved.

[0025]

According to the flame hole member of the present invention, a notch for ejecting gas is provided in a narrow portion between the divided main flame holes (flame hole portions), and a small flame is provided between the flames of the main flame holes. So that this small flame heats the vicinity of the base of the flame in the main flame hole to improve the stability of each flame, and the small flame contacts the base of the flame in the main flame holes on both sides and the flame When the flames are connected to each other at the base, mutual flame holding action is generated between the flames, and the vibration of the flame due to the disturbance can be suppressed, and it is possible to prevent the flame from falling into the oscillating combustion.

[Brief description of the drawings]

FIG. 1 is a partial plan view of a flame hole member showing an embodiment of the present invention.

FIG. 2 is a partial perspective view of the flame hole member.

FIG. 3 is a sectional view of the flame hole member.

FIG. 4 is another sectional view of the flame hole member.

FIG. 5 is still another sectional view of the flame hole member.

FIG. 6 is a perspective view of a burner equipped with the flame hole member.

FIG. 7 is a cross-sectional view of the burner of FIG. 6 taken along plane A.

FIG. 8 is a sectional view of the burner of FIG. 6 taken along the B plane.

FIG. 9 is an explanatory diagram showing a state of a flame formed on the flame hole member according to the embodiment of the present invention.

FIG. 10 is a partial plan view of a prior art flame hole member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flame hole member 1A, 1B, 1C, 1D, 1E Metal plate 10 Burner 21, 22, 23, 24 Constriction part 31, 33, 35 Large flame hole 32, 34 Small flame hole 41A, 41B Convex part 42 , 43, 44 Gas flow path 51, 52 Notch

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideo Ueda 93, Edo-cho, Chuo-ku, Kobe, Hyogo Prefecture Inside Noritz (72) Inventor Takahiro Matsuda 93, Edo-cho, Chuo-ku, Kobe, Hyogo (72) Inventor Itsuo Nagai 93, Edo-cho, Chuo-ku, Kobe City, Hyogo Pref. (56) References JP-A-55-60112 (JP, A) 296418 (JP, A) Fully open sho 56-33423 (JP, U) Full open sho 58-112821 (JP, U) Full open sho 52-1006851 (JP, U) (58) Fields investigated (Int. ⁷ , DB name) F23D 14/08 F23D 14/74

Claims (1)

(57) [Claims] 1. A flame hole member formed by stacking a plurality of strip-shaped metal plates having a convex portion or a concave portion to form a gap serving as a gas flow path between the metal plates, wherein Each of the innermost pair of metal plates is provided with a number of convex portions at the top thereof, and the convex portions of both metal plates are brought into contact with each other to define a gap between both metal plates, and the pair of metal plates are formed. Provide a notch extending from the upper end to below the convex part in an appropriate number or all convex parts of the plate, gas in the gas flow path below the convex part flows into the notch,
A flame hole member which is ejected from its upper end .