Plate-type burner

Abstract

To provide a plate-type burner in which a plurality of combustion plates 2 is aligned and placed in an opening of a burner body 1, with a seal material 3 interposed between adjacent combustion plates 2 and 2, which prevents the seal material 3 from bulging toward a front face 2b side of the combustion plate 2 when the seal material 3 turns into a high temperature and increases the volume.SOLUTION: A width of a gap 4 between adjacent combustion plates 2 and 2, in which the seal material 3 is interposed, is made narrower on the front face 2b side of the combustion plate 2 than that on a rear face 2a side. Then, a compression ratio of the seal material 3 is made higher on the front face 2b side of the combustion plate 2 than that on the rear face 2a side. In the same manner, also a width of a gap between a peripheral wall surface of the opening of the burner body and the combustion plate, in which the seal material is interposed, is made narrower on the front face 2b side of the combustion plate 2 than that on the rear face 2a side.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a plate burner including a burner body having an opening into which an air-fuel mixture is supplied, and a combustion plate attached to the opening of the burner body. [Background technology]

[0002] The combustion plate has a back surface facing the internal space of the burner body and a front surface opposite to the back surface, and has many flame holes penetrating from the back surface to the front surface for ejecting the air-fuel mixture inside the burner body. Conventionally, a plate-type burner in which multiple combustion plates are arranged side by side to cover the opening of the burner body and a seal material is interposed between adjacent combustion plates is known (see, for example, Patent Document 1).

[0003] Here, the sealing material is generally made of ceramic wool. An organic binder is added to the ceramic wool to bind the wool fibers. Therefore, the sealing material has a characteristic that when it becomes hot, the organic binder decomposes, the wool fibers become loose, and the volume increases. Therefore, when the sealing material is heated to a high temperature during combustion in the plate-type burner, the volume of the sealing material increases and the sealing material may protrude toward the surface side of the combustion plate. When the sealing material protrudes toward the surface side of the combustion plate, it has an adverse effect on the combustion performance (especially the flame transfer performance between adjacent combustion plates).

[0004] In addition, in plate-type burners, a seal is also provided between the peripheral wall of the opening of the burner body and the combustion plate. When this seal becomes hot, it may protrude onto the surface of the combustion plate, adversely affecting the combustion performance. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2011-185445 A Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above, an object of the present invention is to provide a plate-type burner that can prevent a sealing material from protruding onto the surface side of the combustion plate. [Means for solving the problem]

[0007] In order to solve the above problems, the first invention of the present application is a plate-type burner comprising a burner body having an opening into which an air-fuel mixture is supplied, and a combustion plate attached to the opening of the burner body, the combustion plate having a back surface facing the internal space of the burner body and a front surface opposite the back surface, the combustion plate having a number of flame holes penetrating from the back surface to the front surface for ejecting the air-fuel mixture inside the burner body, a plurality of combustion plates arranged side by side to cover the opening, and a sealing material interposed between adjacent combustion plates, the gap between adjacent combustion plates through which the sealing material is interposed is arranged so that the width of the gap is narrower on the front surface side of the combustion plate than on the back surface side, and the compression rate of the sealing material is higher on the front surface side of the combustion plate than on the back surface side.

[0008] The second invention of the present application is a plate-type burner comprising a burner body having an opening into which an air-fuel mixture is supplied, and a combustion plate attached to the opening of the burner body, the surface of the combustion plate facing the internal space of the burner body being the back surface and the opposite surface being the front surface, the combustion plate having a number of flame holes penetrating from the back surface to the front surface for ejecting the air-fuel mixture inside the burner body, and a sealing material being interposed between the peripheral wall surface of the opening and the combustion plate, the gap between the peripheral wall surface of the opening and the combustion plate through which the sealing material is interposed is arranged so that the width of the gap is narrower on the front surface side of the combustion plate than on the back surface side, and the compressibility of the sealing material is higher on the front surface side of the combustion plate than on the back surface side.

[0009] According to the first and second aspects of the present invention, even if the sealant becomes hot and increases in volume, the increase in volume is absorbed by the back side of the combustion plate, where the sealant has a low compression ratio. Therefore, the sealant can be prevented from protruding toward the front side of the combustion plate. As a result, poor combustion caused by the sealant protruding toward the front side of the combustion plate can be prevented.

[0010] In the first and second inventions, in order to make the width of the gap through which the sealing material is provided narrower on the front side of the combustion plate than on the back side, the side end face of the combustion plate facing this gap can be formed as an inclined surface that slopes in the direction widening the gap from the front side to the back side of the combustion plate, or can be formed as a stepped surface in which the back side portion of the side end face is offset with a step in the direction widening the gap from the front side of the combustion plate. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a perspective view of a plate burner according to an embodiment of the present invention. [Diagram 2] FIG. 2 is an exploded perspective view of the plate burner according to the embodiment. [Diagram 3] FIG. 2 is an enlarged cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is an enlarged cross-sectional view taken along line IV-IV in FIG. [Diagram 5] FIG. 4 is a cross-sectional view corresponding to FIG. 3 of another embodiment. [Figure 6] 5 is a cross-sectional view corresponding to FIG. 4 of another embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] 1 and 2, a plate-type burner according to an embodiment of the present invention includes a burner body 1 having an upwardly facing, substantially U-shaped opening 11, and a ceramic combustion plate 2 attached to the opening 11 of the burner body 1. A receiving edge 11b bent inwardly is provided at the lower edge of a peripheral wall surface 11a of the opening 11 to receive the outer edge of the combustion plate 2. A mixing tube section 12 is connected to the end of the burner body 1. A mixed gas (a mixture of fuel gas and primary air) is supplied to the inside of the burner body 1 via the mixing tube section 12.

[0013] A plurality of (specifically, five) combustion plates 2 are arranged side by side to cover the opening 11. Referring also to Figures 3 and 4, the combustion plate 2 has a back surface 2a that faces the internal space of the burner body 1 and a front surface 2b that faces the opposite surface, and has a large number of flame holes 21 that penetrate from the back surface 2a to the front surface 2b for ejecting the air-fuel mixture in the burner body 1. Although not shown in Figure 2, a ceramic wool seal material 3 is provided between adjacent combustion plates 2, 2 and between the peripheral wall surface 11a of the opening 11 and the combustion plate 2.

[0014] Here, when the sealing material 3 is heated to a high temperature during combustion in the plate burner, the volume of the sealing material 3 increases as described above. If this increase in volume causes the sealing material 3 to protrude toward the front surface 2b of the combustion plate 2, this will have an adverse effect on the combustion performance.

[0015] 3 and 4, in this embodiment, the gap 4 between adjacent combustion plates 2, 2 through which the seal material 3 is provided, and the gap 5 between the peripheral wall surface 11a of the opening 11 and the combustion plate 2 through which the seal material 3 is provided are provided so that the width of the gaps 4, 5 is narrower on the front surface 2b side of the combustion plate 2 than on the back surface 2a side. Specifically, the side end surface 2c facing each gap 4, 5 of the combustion plate 2 is formed as an inclined surface that is inclined in a direction that widens the gaps 4, 5 from the front surface 2b side toward the back surface 2a side of the combustion plate 2. The compressibility of the seal material 3 is set to be higher on the front surface 2b side of the combustion plate 2 than on the back surface 2a side.

[0016] According to this, even if the sealing material 3 becomes hot and increases in volume, the increase in volume is absorbed by the back surface 2a of the combustion plate 2, where the compression rate of the sealing material 3 is low. Therefore, the sealing material 3 can be prevented from protruding toward the front surface 2b of the combustion plate 2. As a result, the occurrence of poor combustion due to the sealing material 3 protruding toward the front surface 2b of the combustion plate 2 can be prevented.

[0017] 5 and 6, the side end surface 2c of the combustion plate 2 facing each gap 4, 5 may be formed as a stepped surface in which the portion of the side end surface 2c on the back surface 2a side of the combustion plate 2 is offset with a step in the direction of widening the gaps 4, 5 from the portion on the front surface 2b side of the combustion plate 2. In this case, too, the width of each gap 4, 5 is narrower on the front surface 2b side of the combustion plate 2 than on the back surface 2a side, and the compressibility of the sealing material 3 is higher on the front surface 2b side of the combustion plate 2 than on the back surface 2a side, thereby obtaining the same effect as in the above embodiment.

[0018] Although the embodiment of the present invention has been described above with reference to the drawings, the present invention is not limited thereto. For example, in the above embodiment, the opening 11 of the burner body 1 faces upward, but the opening 11 may face sideways or downward. In addition, in the above embodiment, the number of combustion plates 2 is five, but the number may be a number other than five, or may be one. Furthermore, in the above embodiment, the side end faces 2c, 2c of both adjacent combustion plates 2, 2 facing the gap 4 through which the seal material 3 is interposed are formed into an inclined surface or a stepped surface, but it is also possible to form only the side end face 2c of one of the adjacent combustion plates 2, 2 into an inclined surface or a stepped surface. [Explanation of symbols]

[0019] 1...burner body, 11...opening, 11a...circumferential wall surface of opening, 2...combustion plate, 2a...rear surface, 2b...front surface, 2c...side end surface, 21...flame hole, 3...sealing material, 4, 5...gaps through which sealing material is disposed.

Claims

1. A plate-type burner comprising a burner body having an opening into which an air-fuel mixture is supplied, and a combustion plate attached to the opening of the burner body, the combustion plate having a back surface facing the internal space of the burner body and a front surface opposite thereto, the combustion plate having a number of flame holes penetrating from the back surface to the front surface for ejecting the air-fuel mixture within the burner body, the plurality of combustion plates being arranged side by side to cover the opening, and a sealant being interposed between adjacent combustion plates, A plate-type burner characterized in that the gap between adjacent combustion plates through which a sealing material is provided is narrower on the front side of the combustion plates than on the back side thereof, and the compressibility of the sealing material is higher on the front side of the combustion plates than on the back side thereof.

2. A plate-type burner comprising a burner body having an opening into which an air-fuel mixture is supplied, and a combustion plate attached to the opening of the burner body, the combustion plate having a back surface facing the internal space of the burner body and a front surface opposite thereto, the combustion plate having a number of flame holes penetrating from the back surface to the front surface for ejecting the air-fuel mixture within the burner body, and a sealant being interposed between the peripheral wall surface of the opening and the combustion plate, A plate-type burner characterized in that a gap between the peripheral wall surface of the opening and the combustion plate, through which a sealing material is interposed, is provided so that the width of the gap is narrower on the front side of the combustion plate than on the back side thereof, and the compressibility of the sealing material is higher on the front side of the combustion plate than on the back side thereof.

3. 3. A plate-type burner according to claim 1, wherein a side end surface of the combustion plate facing the gap is formed as an inclined surface inclined in a direction widening the gap from the front side to the back side.

4. A plate-type burner as described in claim 1 or 2, characterized in that the side end surface of the combustion plate facing the gap is formed as a stepped surface in which the back side portion of the side end surface is offset with a step in the direction widening the gap from the front side portion of the side end surface.

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