JP6475092B2 - Combustion device - Google Patents

Description

  The present invention relates to a combustion apparatus including a burner having a combustion plate made of sheet metal.

  Conventionally, as a combustion apparatus of this type, according to Patent Document 1, a burner body in which an air-fuel mixture is supplied and a combustion made of a sheet metal in which a large number of flame holes for covering the open surface of the burner body are formed. 2. Description of the Related Art A combustion apparatus is known that includes a burner having a plate and a combustion housing having a joint flange at one end fastened to a flange portion surrounding an open surface of the burner body. In this case, the peripheral edge of the combustion plate is overlapped with the flange portion of the burner body via the first packing, and the joining flange of the combustion housing is overlapped with the peripheral edge of the combustion plate via the second packing. In this state, the joining flange is fastened to the flange portion of the burner body, whereby the peripheral edge portion of the combustion plate is fastened together with the flange portion of the burner body.

  By the way, in order to prevent gas leakage, it is necessary to improve the sealing property between the flange part of the burner body and the peripheral part of the combustion plate, and for that purpose, it is necessary to ensure the flatness of the peripheral part of the combustion plate. is there. Here, when the combustion plate is press-molded, the peripheral portion of the combustion plate is only sandwiched between the die and the blank holder, so that the peripheral portion of the combustion plate is likely to be wrinkled, and the flatness of the peripheral portion In other words, it is difficult to improve the sealing performance between the flange portion of the burner body and the peripheral portion of the combustion plate.

European Patent Application Publication No. 2811141

  In view of the above, the present invention ensures the flatness of the peripheral edge of the combustion plate and enhances the sealing performance between the flange portion of the burner body and the peripheral edge of the combustion plate. The challenge is to provide

  In order to solve the above-described problems, the present invention provides a burner body to which an air-fuel mixture is supplied, and a sheet metal combustion plate that covers the open surface of the burner body and has a plurality of flame holes from which the air-fuel mixture is ejected. And a combustion casing having a joint flange at one end fastened to a flange portion surrounding the open surface of the burner body, the flange portion of the burner body with a direction from the burner toward the combustion casing as a predetermined direction Is formed in a stepped shape having a first joint surface on the inner peripheral side facing the predetermined direction and a second joint surface on the outer peripheral side facing the predetermined direction at a position offset in the predetermined direction from the first joint surface, A first flat portion on the inner peripheral side that is fastened to the first joint surface in a state where the first packing is sandwiched between the peripheral portion of the combustion plate and the first joint surface, and in a predetermined direction from the first flat portion. Offset and overlaps the second joint surface A second flat portion on the side and a step portion between the first flat portion and the second flat portion, and the second flat portion and the second flat surface between the joint flange of the combustion housing and the second joint surface. It is fastened to the second joint surface in a state of sandwiching the second packing that overlaps the part.

  According to the present invention, at the time of press molding of the combustion plate, the first flat surface portion is drawn while the second flat surface portion is sandwiched between the die and the blank holder while the step portion is stretched. Become. Therefore, the first flat portion is not strongly pulled during press molding and wrinkles or the like are not generated, and the flatness of the first flat portion can be ensured. Furthermore, the first plane portion is not only pressed against the first joint surface side by the fastening force with respect to the first joint surface of the first plane portion, but also by the fastening force with respect to the second joint surface of the joint flange of the combustion housing. It is pressed against the first joint surface side through the flat portion and the step portion. Therefore, the flange portion of the burner body and the combustion plate can be combined with the fact that the first flat portion can be strongly pressed against the first joint surface with the first packing interposed therebetween, and the flatness of the first flat portion can be secured. It is possible to improve the sealing performance between the peripheral edge of the two.

  Moreover, in this invention, the fastening location with respect to the 1st joining surface of a 1st plane part is made into a 1st fastening location, and the fastening location with respect to the 2nd joining surface of the joining flange of a combustion housing is made into a 2nd fastening location. Is preferably included in the same circumferential direction portion as the intermediate portion of the arrangement interval of the first fastening locations. According to this, the pressing force with respect to a 1st joint surface acts on the intermediate part of the arrangement | positioning space | interval of a 1st fastening location by the fastening force which acts on the 2nd fastening location of the same circumferential direction part as this. Therefore, even if the arrangement interval of the first fastening locations is increased to some extent, the sealing performance is not deteriorated due to insufficient pressing force against the first joint surface. Therefore, it is possible to reduce the number of first fastening points that are closer to the combustion portion of the burner and have a higher temperature than the second fastening points, which is advantageous in improving durability.

The perspective view which shows the combustion apparatus of embodiment of this invention. Sectional drawing cut | disconnected by the II-II line | wire of FIG. Sectional drawing cut | disconnected by the III-III line | wire of FIG. The expanded sectional view cut | disconnected by the IV-IV line of FIG.

  Referring to FIGS. 1 and 2, a combustion apparatus according to an embodiment of the present invention includes a burner 1 having a burner body 2 and a sheet metal combustion plate 3 that covers a downward open surface 21 of the burner body 2. And a combustion housing 4 having a joint flange 41 at an upper end fastened to a flange portion 22 surrounding the open surface 21 of the body 2. A heat exchanger 5 for hot water supply is disposed in the combustion housing 4, and a latent heat recovery sub heat exchanger (not shown) is disposed below the combustion housing 4.

  The burner body 2 is provided with an inlet 23 to which an air-fuel mixture supply duct (not shown) is connected. Further, as shown in FIG. 3, a large number of flame holes 31 are formed in the combustion plate 3, and the air-fuel mixture supplied from the inlet 23 into the burner body 2 is ejected from these flame holes 31 and undergoes primary combustion. .

  The heat exchanger 5 is configured by a fin tube type heat exchanger that includes a large number of fins 51 and a plurality of heat absorption tubes 52 that pass through the fins 51. A plurality of connection lids 53 are attached to the outer surfaces of the side plates 42 on both sides in the lateral direction of the combustion housing 4 so as to define a connection path between two adjacent heat absorption tubes 52, 52 between the side plates 42. An endothermic pipe 52 is connected in series. Further, a hot water outlet 54 is provided in a connection lid 53 that defines a connection path connected to the heat absorption pipe 52 at the downstream end with the side plate 42.

  In addition, on the inner side of the front side plate 43 and the rear side plate 44 of the combustion housing 4 above the heat exchanger 5, two upper and lower water pipes 6 are provided in order to prevent overheating of the side plates 43 and 44, respectively. , 6 are arranged in contact with the side plates 43, 44, respectively. Further, on the outer surface of the side plate 42 on one side in the horizontal direction of the combustion housing 4, an inflow side header lid 61 that defines a connection path between the upper and lower two water pipes 6, 6 between the side plate 42, and a front side An outflow side header lid 62 that defines a connection path between the upper and lower water pipes 6, 6 and the heat absorption tube 52 at the upstream end of the heat exchanger 5 is attached to the side plate 42, and enters the inflow side header lid 61. A water port 63 is provided. Further, on the outer surface of the side plate 42 on the opposite side in the lateral direction of the combustion housing 4, as shown in FIG. 3, a connection lid that defines a connection path between the rear water tube 6 and the front water tube 6 between the side plate 42. 64 is attached. Then, the water that has passed through the auxiliary heat exchanger passes through the inlet 63 and the connection path in the inflow side header lid 61, the rear side water pipe 6, the connection path in the connection lid 64, the front side water pipe 6, and the outflow side header lid 62. The hot water supplied to the heat exchanger 5 through the connection path and heated by the heat exchanger 5 is discharged from the hot water outlet 54.

  An ignition electrode 71, a ground electrode 72, and a frame rod that pass through the side plate 43 and project into the combustion housing 4 are disposed between the joint flange 41 of the front side plate 43 of the combustion housing 4 and the upper water pipe 6. The electrode component 7 having 73 and an insulator 74 through which these are inserted and fixed is mounted using a pressing plate 75 that overlaps the outer surface of the insulator 74. In addition, the holding plate 75 has an extending portion that extends to one side in the lateral direction from a portion that overlaps the insulator 74, and a viewing window 76 for viewing the inside of the combustion housing 2 is provided in the extending portion. .

  By the way, in order to prevent gas leakage from the burner body 2, it is necessary to improve the sealing performance between the flange portion 22 of the burner body 2 and the peripheral portion of the combustion plate 3. Therefore, a special structure is adopted in this embodiment. This point will be described below with reference to FIG.

  In the present embodiment, the lower portion that is the direction from the burner 1 toward the combustion housing 4 is a predetermined direction, and the flange portion 22 of the burner body 2 has a first joint surface 221 on the inner peripheral side facing the predetermined direction, and a first joint surface. It is formed in a stepped shape having a second joint surface 222 on the outer peripheral side facing the predetermined direction at a position offset in a predetermined direction from 221.

Further, the peripheral portion of the combustion plate 3, the inner circumferential side to be fastened by screwing from below the first joint surface 221 in a first state sandwiching the packing ₈₁ between the first bonding surface 221 first A step between the flat portion 32, the second flat portion 33 on the outer peripheral side that is offset in a predetermined direction from the first flat portion 32 and overlaps the second joint surface 222, and the step between the first flat portion 32 and the second flat portion 33. Part 34 is provided. Then, burning the joining flange 41 of the housing 4, the second flat section 33 and the second packing 8 ₂ and the second joint surface in a state sandwiching the overlapping on the lower surface of the second flat portion 33 between the second joint surface 222 It is fastened to 222 by screwing from above. Note that a boss portion 223 into which a screw is screwed in from below is projected on the upper surface of the flange portion 22 of the burner body 2 so as to be positioned at a portion matching the fastening portion of the first flat portion 32 with respect to the first joint surface 221. It is installed.

Further, in the present embodiment, the width of the joint flange 41 and a second portion overlapping the packing 8 ₂ and about half of the joint flange 41 and the second packing ₈₂ of the width of the second flat portion 33, the second joint surface 222 A recessed portion 222a that is recessed upward by the thickness of the second flat surface portion 33 is formed in the inner peripheral half. When the joining flange 41 is fastened to the second joining surface 222, the second flat surface portion 33 is received by the recessed portion 222 a, and the lower surface of the second flat surface portion 33 is aligned with the outer peripheral side half of the second joining surface 222. I try to be almost the same. Incidentally, it is also possible to substantially equal to the joint flange 41 and the second packing 8 joining flange 41 the width of the portion overlapping the ₂ and the second packing ₈₂ of the width of the second flat portion 33, in this case, the second It is not necessary to form the recess 222a in the joint surface 222. Further, may also be second packing 8 ₂ overlaps the upper surface of the second flat portion 33, in this case, it is also possible to integrate the first packing 8 ₁ and the ₂ second packing 8.

According to the above configuration, when the combustion plate 3 is press-molded, the first flat surface 33 is stretched while the second flat surface portion 33 is sandwiched between the die of the press mold and the blank holder while the portion that becomes the stepped portion 34 is stretched. The part 32 is drawn. Therefore, the first flat portion 33 is not strongly pulled during press molding, and wrinkles or the like are not generated in the first flat portion 32, and the flatness of the first flat portion 32 can be ensured. Furthermore, the first flat surface portion 32 is not only pressed against the first bonding surface 221 side by the fastening force of the first flat surface portion 32 to the first bonding surface 221, but also the second bonding surface 222 of the bonding flange 41 of the combustion housing 4. Is also pressed against the first joint surface 221 side through the second flat surface portion 33 and the stepped portion 34. Therefore, the first flat portion 32 can be pressed strongly to the first joint surface 221 in a first state sandwiching the packing _81, coupled with the ability to secure the flatness of the first flat section 32, the burner body 2 The sealing performance between the flange portion 21 and the peripheral edge portion of the combustion plate 3 can be enhanced.

  Moreover, in this embodiment, the fastening location (screw fastening location) with respect to the 1st joining surface 221 of the 1st plane part 32 is the 1st fastening location 32a, and the fastening location with respect to the 2nd joining surface of the joining flange 41 is the 2nd fastening location 41a. As described above, the second fastening portion 41a includes a portion located in the same circumferential direction portion as the intermediate portion of the arrangement interval of the first fastening portions 32a.

  According to this, the pressing force with respect to the 1st joint surface 221 acts on the intermediate part of the arrangement | positioning space | interval of the 1st fastening location 32a with the fastening force which acts on the 2nd fastening location 41a located in the same circumferential direction part as this. . Therefore, even if the arrangement interval of the first fastening locations 32a is increased to some extent, the sealing performance is not deteriorated due to insufficient pressing force against the first joint surface 221. Therefore, it is possible to reduce the number of first fastening points 32a that are closer to the combustion portion of the burner 1 than the second fastening point 41a and have a high temperature, which is advantageous in improving durability.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, in the above embodiment, the burner body 2 is formed with the downward open surface 21, but the present invention is similarly applied to a combustion apparatus in which the open surface is upward and the predetermined direction from the burner to the combustion housing is upward. Applicable.

DESCRIPTION OF SYMBOLS 1 ... Burner, 2 ... Burner body, 21 ... Open surface, 22 ... Flange part, 221 ... 1st joining surface, 222 ... 2nd joining surface, 3 ... Combustion plate, 31 ... Flame hole, 32 ... 1st plane part, 32a ... first coupling portion, 33 ... second flat portion, 34 ... stepped portion, 4 ... combustion housing, 41 ... joining flange, 41a ... second fastening point, 8 1 _... first packing 8 2 _... second packing.

Claims (2)

A burner body having an air-fuel mixture supplied therein, a burner made of sheet metal that covers the open surface of the burner body and has a number of flame holes from which the air-fuel mixture is ejected, and an open surface of the burner body In a combustion apparatus comprising a combustion housing having a joining flange at one end fastened to a flange portion,
The direction from the burner to the combustion housing is a predetermined direction, and the flange portion of the burner body faces the predetermined direction at a position that is offset in the predetermined direction with respect to the first joint surface on the inner peripheral side facing the predetermined direction and the first joint surface. Formed in a stepped shape having a second joint surface on the outer peripheral side,
A first flat portion on the inner peripheral side that is fastened to the first joint surface in a state where the first packing is sandwiched between the peripheral portion of the combustion plate and the first joint surface, and in a predetermined direction from the first flat portion. A second planar portion on the outer peripheral side that is offset and overlaps the second joint surface, and a stepped portion between the first planar portion and the second planar portion are provided,
A combustion apparatus, wherein a joining flange of a combustion housing is fastened to a second joining surface in a state where a second flat surface portion and a second packing overlapping the second flat surface portion are sandwiched between the second joining surface.   A fastening location of the first flat surface portion with respect to the first joining surface is a first fastening location, a fastening location of the joining flange with respect to the second joining surface is a second fastening location, and a second fastening location has a first fastening location. The combustion apparatus according to claim 1, wherein a device located in the same circumferential direction portion as an intermediate portion of the arrangement interval is included.

Images