JP3358424B2 - 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 As a conventional gas burner used for a water heater or the like, there is known 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. In particular, in the burner of the gray-scale combustion method manufactured by pressing a metal plate, which is recently seen, the structure is more complicated than that of a general Bunsen combustion type burner. This is advantageous in manufacturing.

A conventional flame hole member is disclosed in Japanese Patent Laid-Open No. 7-31090.
As shown in Japanese Patent Application Publication No. 8 (1999), a plurality of strip-shaped metal plates having projections and depressions are connected to each other via a narrow connecting portion, and the metal plate is folded by bending the connecting portion. In the folded state, adjacent metal plates are formed with a contact portion where the protruding portions contact each other and a separated portion having a gap between the two metal plates, and the gap serves as a gas flow path.

[0004]

When this conventional flame hole member is mounted on a burner, the bent connection portion is protruded at the upper end on the flame hole surface side and is protruded at the lower end on the opposite surface. Although it is divided, the connection part protruding to the flame hole side will be exposed to the high temperature of the flame, especially if using a fuel gas with a fast burning speed, reducing the amount of combustion and continuing to burn with a short flame length, it will become red hot I often do it. If such a state is repeated frequently over a long period of time, the connection part will deteriorate and break,
When an external force such as vibration or pressure is applied, the metal plate may fall into the burner.

[0005] The present invention solves the above-mentioned problems and provides a flame hole member which can maintain a predetermined flame hole shape without falling off the metal plate even when the connection portion on the flame hole side breaks. For the purpose of providing.

[0006]

In order to achieve the above object, the flame hole member of the present invention has the following configuration.
That is, a plurality of strip-shaped metal plates having projections and depressions are connected to each other via a narrow connection portion, and the connection portion is bent to fold the metal plates so that adjacent metal plates contact each other. Part, forming a separated portion having a gap, in the flame hole member using the gap as a gas flow path, at least one of the metal plates interconnected by a connection portion located on the flame hole surface side The metal plate is provided with a projection protruding above or below the contact portion.

The flame hole member is mounted on the upper part of the burner and is clamped from the left and right. When the connecting portion located on the flame hole surface side breaks due to aging, the metal plate connected by this connecting portion tends to fall off when vibration or pressure is applied, but the metal plate trying to fall off In the upper or lower part of the contact portion between the adjacent metal plate and the protrusion protruding from at least one of the two metal plates is overhanging, the metal plate to be dropped,
These projections catch on the adjacent metal plate and prevent the metal plate from falling off.

In other words, when a projection is provided on the metal plate which falls off due to the breakage of the connection portion, a projection is provided on the upper portion of the contact portion, and when a projection is provided on the other metal plate, a projection is provided on the lower portion of the contact portion. Protrusions may be provided, and of course, protrusions may be provided on both metal plates.

[0009]

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 (gap) 42 is formed. The pair of outer metal plates 1C and 1D form gas flow paths 43 and 44 between the inner metal plates 1A and 1B, respectively, and flow near the upper ends of the gas flow paths 43 and 44. Protrusions 45 and 46 for narrowing the road are provided. The projections 45, 46
Is provided only in the small flame holes 32, 34, and is not provided in the large flame holes 31, 33, 35.

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 end portions 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.
Numeral 52 communicates with the gas flow channel 42 and also with the gas flow channels 43 and 44, respectively. The constrictions 21 and 23 also have cutouts 51 and 52, but the constriction 24 does not have the cutouts 51 and 52 and connects the metal plate 1A and the metal plate 1C as shown in FIG. Connecting portion 53, metal plate 1
A connecting portion 54 connecting B and the metal plate 1D protrudes toward the flame hole surface side.

The metal plate 1A and the metal plate 1B are connected by a connecting portion 55 at the lower end, and similarly, the metal plate 1C and the metal plate 1E are connected.
Is a connecting portion 56, and the metal plate 1D and the metal plate 1F are connected by a connecting portion 57, respectively. In this way, the metal plates are connected, and the metal plates do not fall apart during manufacturing.

The flame port member composed of the six metal plates has the following structure.
Manufactured from two large metal plates. That is, the connection portion 5
The necessary unevenness is formed at the same time as cutting out between the metal plates so as to leave 3, 54, 55, 56 and 57, and then the connecting portions 53, 54, 55, 56 and 57 are sequentially bent and the metal plates are folded. It is.

The metal plate 1A is connected to the gap 61 between the metal plates 1A and 1C by a connecting portion 53 protruding toward the flame hole side.
A is provided with a projection 63, and similarly, the metal plates 1B,
A protrusion 65 provided on the metal plate 1B protrudes above the contact portion 66 from the 1D spaced portion 64.

In this embodiment, the metal plates 1C and 1D are also provided with projections 67 and 68, respectively.

Reference numerals 70, 71 denote outermost metal plates 1E, 1
F is a protrusion provided on F and protrudes outward to the same extent as protrusions 72 and 73.

FIG. 6 shows an example in which the flame hole member 1 is mounted on a burner 10 of a dense and light 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. Flame hole member 1
The protruding portions 70, 71 and the convex portions 72, 73 abut against the wall surfaces of the rich mixed gas chambers 11, 11, and the rich mixed gas chambers 11, 1,
It is pinched between 1.

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 so that 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, but the ejection speed is slower than that of 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 constricted portions 21, 22, and 23, FIG.
, Four inner metal plates 1A, 1B, 1C, 1D
Are in contact with each other at the center, but the notches 51 and 52 provided in the innermost pair of metal plates 1A and 1B are
A, since it has reached below 41B, the gas flow path 4
The gas passing through 3, 44 flows through the notches 51, 52 and gushes from the upper end, forming a small flame with a low flow velocity.

Thus, the flame holes 31, 32, 33, 34,
Small flames of the constricted portions 21, 22, and 23 are formed between the main flames 35, and the small flames come into contact with the bases of the main flames on both sides. Of vibration.

On the other hand, in the constricted portion 24 where the connecting portions 53 and 54 protrude as shown in FIG. 5, the connecting portions 53 and 54 become hot due to the high heat of the flames of the flame holes 34 and 35 and may become red-hot. . In particular, if the combustion length is reduced and the flame length is kept short, red heat is likely to occur. If such a state is repeated frequently over a long period of time, the connecting portions 53 and 54 will deteriorate and break.

When the connecting portions 53 and 54 are broken, the metal plate 1
Since the connection between A and 1C and the metal plates 1B and 1D is cut off, the metal plate 1
A and 1B are simply sandwiched from both sides,
When an external force such as vibration or pressure is applied, it tends to fall down due to its own weight.

The metal plate 1A, 1 when B starts to move downward, the convex portion of the metal plate 1C of the projections 63 of the metal plate 1A forms an abutment 62, the projections 65 of the metal plate 1B abutting portion 66 , Respectively, and are unable to move downward. In this way, the metal plates 1A, 1B are prevented from falling off, and it is possible to prevent a change in the shape of a flame hole or the like due to the metal plates 1A, 1B falling off and the deterioration of the combustion performance.

FIG. 9 shows another embodiment of the flame hole member of the present invention, which is shown in a cross section of the constricted portion 24 as in FIG. In this embodiment, the metal plate 1C and the metal plate 1D are provided with protrusions 81 and 82, respectively.
The protrusion 82 is provided below the contact portion 84 between the metal plates 1D and 1B.

The connecting portions 53 and 54 are broken and the metal plates 1A,
When the metal plate 1B attempts to fall downward, the metal plate 1A is hooked on the projection 81, and the metal plate 1B is hooked on the projection 82, and the metal plates 1A and 1B are prevented from falling off.

As described above, the one shown in FIG.
84 is provided with projections 81 and 82 in the lower portion, and FIG. 5 is provided with projections 63 and 65 in the upper portion of the contact portions 62 and 66. The projections may be provided on the surface.

[0030]

According to the present invention, at least one of the metal plates connected to each other by the connecting portion located on the side of the burner hole projects above or below the contact portion. Since the projections are provided, it is possible to prevent the metal plate from falling off when the connection portion is broken, and to prevent a change in the shape of the flame hole due to the metal plate falling off and a deterioration in combustion performance accompanying the change. .

[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 in the A plane.

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

FIG. 9 is a cross-sectional view of a flame hole member showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flame hole member 1A, 1B, 1C, 1D, 1E, 1F Metal plate 10 Burner 41A, 41B Gas flow path 53, 54, 55, 56, 57 Connection part 61, 64 Separation part 62, 66, 83, 84 Contact Part 63, 65, 81, 82 Projection

Continued on the front page (72) Inventor Hideo Ueda 93rd Edocho, Chuo-ku, Kobe City, Hyogo Prefecture Inside Noritz Co., Ltd. (72) Inventor Masahiko Shimazu 93rd Edocho, Chuo-ku, Kobe City, Hyogo Noritsu Co., Ltd. (72) Inventor Hidenori Hata 93, Edo-cho, Chuo-ku, Kobe City, Hyogo Prefecture Inside Noritz Co., Ltd. (56) References JP-A-7-310908 (JP, A) JP-A-4-131605 (JP, A) Japanese Utility Model Showa 54-34146 (JP, U) Japanese Utility Model Showa 56-103726 (JP, U) Japanese Utility Model Showa 58-112821 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23D 14/08 F23D 14/74

Claims (1)

(57) [Claims] 1. A plurality of strip-shaped metal plates having irregularities are connected to each other via a narrow connecting portion, and the connecting portions are bent to fold the metal plates so that adjacent metal plates can be connected to each other. In the flame hole member which forms a contact portion to be in contact with and a separation portion having a gap, and the gap serves as a gas flow path, of the metal plates interconnected by the connection portion located on the flame hole surface side At least one metal plate is provided with a protrusion protruding above or below the contact part , and the connection part is broken
Then there is a metal plate that is going to fall down,
When the metal plate starts moving downward due to breakage, the protrusion
Characterized by being caught and not moving downward .