JP6174427B2 - Combustion device - Google Patents

Description

  The present invention is provided with a combustion casing, and provided with a partition plate that divides the space in the combustion casing into a combustion chamber and an air supply chamber below the combustion chamber. A plurality of burners longitudinally arranged in the front-rear direction are arranged in parallel in the combustion chamber so that secondary air is supplied from the supply chamber to the combustion chamber through a number of distribution holes formed in the partition plate. The present invention relates to a combustion apparatus.

  Conventionally, as this type of combustion apparatus, a structure in which a portion above the upper end of the burner on the front and rear walls of the combustion housing is configured as an inner / outer double structure of an outer wall plate and a heat shield covering the inner surface of the outer wall plate is known. (For example, refer to Patent Document 1). A drooping plate portion extending below the upper end of the burner is provided at the lower end of the heat shield plate via a bent portion that is bent inward in the front-rear direction, which is a direction away from the outer wall plate.

  Here, the front and rear end edges of each burner are positioned outward in the front-rear direction from the hanging plate portion. And the slit of the up-down direction corresponding to each burner is formed in the hanging board part, and each edge part before and behind each burner is inserted in each slit. In addition, a vent hole is formed in the bent portion of the heat shield plate, through which air flowing into the gap between the hanging plate portion and the outer wall plate is jetted, and the air jets upward from the vent hole along the heat shield plate. Thus, the heat shield is cooled.

  However, in the above conventional example, a part of the air flowing in the gap between the hanging plate portion and the outer wall plate is inevitably generated between the slit and the end portion of the burner inserted into the slit. A flame that is ejected inward in the front-rear direction and formed at the end of the flame outlet of the burner is blown by the air that is ejected from the clearance, which tends to cause poor combustion. Also, since the burner end enters the gap between the hanging plate portion and the outer wall plate through the slit, the air hits the burner end portion, and the air does not flow smoothly into the gap between the hanging plate portion and the outer wall plate. . As a result, air cannot be ejected vigorously from the vent hole, and the heat shield plate cannot be cooled sufficiently.

JP 2006-266516 A

  In view of the above points, an object of the present invention is to provide a combustion apparatus that can eliminate poor combustion and insufficient cooling of a heat shield.

  In order to solve the above problems, the present invention includes a combustion housing, and a partition plate is provided in the combustion housing to partition the space in the combustion housing into a combustion chamber and a supply chamber below the combustion chamber. A plurality of burners that are longitudinally arranged in the front-rear direction and have a flame outlet for jetting an air-fuel mixture are arranged side by side in the combustion chamber, and are secondary to the combustion chamber through a number of distribution holes formed in the partition plate from the air supply chamber. A combustion apparatus in which air is supplied, and a portion above the upper end of the burner of the front and rear walls of the combustion housing has an inner / outer double structure of an outer wall plate and a heat shield covering the inner surface of the outer wall plate. In the structure, a drooping plate portion extending below the burner upper end is provided at the lower end of the heat shield plate via a bent portion that is bent inward in the front-rear direction, which is a direction away from the outer wall plate. The front and rear edges are located inward in the front-rear direction than the hanging plate, and the bent plate Air flowing in the gap between the outer wall plate, characterized in that the vent holes for ejecting is formed with a plurality of the.

  According to the present invention, since the burner end edge is positioned inward in the front-rear direction with respect to the hanging plate portion, it is not necessary to form a slit for inserting the burner end portion in the hanging plate portion as in the conventional example. Therefore, air smoothly flows into the gap between the hanging plate portion and the outer wall plate without hitting the end of the burner, and this air is ejected vigorously upward from the vent formed in the bent portion at the upper end of the hanging plate portion, The heat shield is effectively cooled by this jet of air flow. Furthermore, since no slit is formed in the drooping plate portion, air is not blown inward in the front-rear direction through the slit from the gap between the drooping plate portion and the outer wall plate, and the flame at the end of the flame port is air. It is possible to prevent the occurrence of poor combustion due to being beaten.

  Moreover, in this invention, it is desirable for the drooping board part to incline in the front-back direction outward toward the upper direction. According to this, the direction component heading outward in the front-rear direction, that is, the direction component heading toward the heat shield plate above the bent portion, is given to the air flow ejected upward from the vent formed in the bent portion at the upper end of the hanging plate portion. As a result, the cooling performance of the heat shield plate is improved.

The cut side view of the combustion apparatus of the embodiment of the present invention. The top view of the combustion apparatus of an embodiment. The perspective view of the state which removed the one part burner and manifold of the combustion apparatus of embodiment. The expanded cutting side view of the principal part of the combustion apparatus of embodiment. The expanded cutting side view of the principal part of the combustion apparatus of other embodiment.

  Referring to FIGS. 1 to 3, reference numeral 1 denotes a combustion casing constituting a combustion apparatus composed of hot water supply and a heat source unit for heating. The upper surface of the combustion casing 1 is open, and a hot water supply heat exchanger and a heating heat exchanger (not shown) are installed on the combustion casing 1 as objects to be heated. In the combustion housing 1, a partition plate 4 that partitions the space in the combustion housing 1 into a combustion chamber 2 and an air supply chamber 3 below the combustion chamber 2 is provided. A combustion fan (not shown) is connected to the bottom surface of the air supply chamber 3 via a duct 5 so that air is supplied from the combustion fan to the air supply chamber 3. A number of distribution holes 41 are formed in the partition plate 4 so that air supplied to the air supply chamber 3 is supplied as secondary air to the combustion chamber 2 through these distribution holes 41.

  In the combustion chamber 2, a plurality of longitudinal burners 6 are arranged in parallel in the front-rear direction having a flame port 61 for ejecting an air-fuel mixture (mixed gas of fuel gas and primary air) at the upper end. The combustion chamber 2 is divided into two chambers by a partition wall 21 arranged immediately below the boundary between the hot water heat exchanger and the heating heat exchanger, and a plurality of burners for the hot water heat exchanger and the heating heat exchanger are provided. 6 is divided into two rooms.

  A rising portion 42 is bent at the front end of the partition plate 4, and a burring hole 43 that fits into the gas inlet 62 at the lower front end of each burner 6 is formed in the rising portion 42. Further, the manifold 7 is mounted on the front side of the rising portion 42 so as to block the lower front surface of the combustion housing 1, and fuel gas is supplied from the plurality of gas nozzles 71 provided in the manifold 7 to the gas inlets 62 of the plurality of burners 6. At the same time, primary air is supplied from the air supply chamber 3 to the gas inlet 62 through a gap defined between the rising portion 42 and the manifold 7. The burner 6 is composed of a dark and light combustion type burner having a pair of upper and lower gas inlets 62, and a burring hole 43 and a gas nozzle 71 are also provided in a pair of upper and lower for each burner 6.

  The front wall of the combustion casing 1 is adjacent to the frame rod 8 facing the front end of the flame outlet 61 of a part of the plurality of burners 6 for the hot water heat exchanger and the heating heat exchanger. An ignition electrode 9 is disposed so as to face above the front end of the flame outlet 61 of the burner 6.

  Further, the upper part of the front and rear wall portions of the combustion casing 1 above the upper end of the burner 6 has an inner / outer double structure of an outer wall plate 11 and a heat shield plate 12 covering the inner surface of the outer wall plate 11. As clearly shown in FIG. 4, lower ends of the heat shield plates 12 on the front and rear wall portions are lower than the upper ends of the burners 6 via bent portions 121 bent inward in the front-rear direction, which is a direction away from the outer wall plate 11. A drooping plate portion 122 that extends is provided. The front and rear edges of each burner 6 are located inward in the front-rear direction with respect to the hanging plate portion 122. A plurality of claw pieces 123 to be inserted into the gaps between the front and rear ends of each burner 6 are formed at the lower end of the drooping plate portion 122 so that each burner 6 can be positioned laterally by the claw pieces 123. ing.

  Furthermore, a burner pressing plate 13 is disposed on the lower inner surface of the rear wall portion of the combustion housing 1. The burner presser plate 13 includes an upright plate portion 131 that extends along the inner surface of the outer wall plate 11 that constitutes the rear wall portion, and a bent plate portion 132 that is bent forward from the upper end of the upright plate portion 131. Then, a plurality of engaging portions 133 (see FIG. 3) for the recessed portions 63 formed in the lower portion of the rear end edge of each burner 6 are formed in the bent plate portion 132 at intervals according to the parallel arrangement pitch of the burners 6, The burner 6 is positioned laterally and can be prevented from coming off upward. The bent plate portion 132 is formed with holes 134 that are positioned between the engaging portions 133 and allow air to pass therethrough.

  By the way, in order to ensure the heat resistance of the combustion housing 1, it is necessary to cool the heat shield plate 12 positioned above the upper end of the burner 6 by flowing air along the heat shield plate 12. Therefore, a plurality of vent holes 124 through which air flowing into the gap between the hanging plate portion 122 and the outer wall plate 11 is formed in the bent portion 121 of the heat shield plate 12.

  If the bent portion 121 is positioned below the upper end of the burner 6, it is not preferable because the flame finds the air ejected from the vent hole 124 as secondary air and falls to the heat shield plate 12 side. Therefore, the bent portion 121 should be positioned above the upper end of the burner 6. Further, it is desirable that the bent portion 121 be positioned below the upper end of the flame at the maximum load. According to this, the vicinity of the upper part of the flame of the heat shield 12 that is most easily heated is cooled by the air ejected from the vent hole 124, so that durability is maintained.

  As described above, in this embodiment, the front and rear edges of the burner 6 are positioned inward in the front-rear direction with respect to the drooping plate portion 122, so that a slit for inserting the burner end portion is provided in the drooping plate portion 122 as in the conventional example. There is no need to form. Accordingly, air smoothly flows into the gap between the hanging plate portion 122 and the outer wall plate 11 without hitting the end of the burner, and this air is ejected vigorously upward from the vent hole 124 formed in the bent portion 121. The heat shield 12 is effectively cooled by the air flow. Further, since no slit is formed in the drooping plate portion 122, air is not blown inward in the front-rear direction through the slit from the gap between the drooping plate portion 122 and the outer wall plate 11, and at the end of the flame outlet 61. It is also possible to prevent the flame from being burned with air and causing poor combustion.

  In this embodiment, in order to reduce the size of the combustion apparatus, the width of the gap between the hanging plate portion 122 and the outer wall plate 11 is narrowed, and the amount of air flowing through this gap is limited. Therefore, a second ventilation hole 125 is formed in each claw piece 123, and the heat shield plate 12 is also cooled by air flowing upward through the ventilation hole 125. If the width of the gap between the hanging plate portion 122 and the outer wall plate 11 can be secured wide, it is not necessary to form the vent hole 125 in the claw piece 123.

  Further, as in the embodiment shown in FIG. 5, the drooping plate portion 122 may be inclined outward in the front-rear direction toward the upper side. According to this, the direction component heading outward in the front-rear direction to the air flow ejected upward from the vent hole 124 formed in the bent portion 121 at the upper end of the drooping plate portion 122, that is, the heat shield plate 12 above the bent portion 121. The heading direction component is given, and the cooling performance of the heat shield 12 is improved.

  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 claw piece 123 for positioning the burner 6 in the lateral direction is bent at the lower end of the hanging plate portion 122, but a holding frame for positioning and holding the plurality of burners 6 is provided. When the burner unit in which a plurality of burners 6 are held in the holding frame is stored in the combustion housing 1, it is not necessary to position and fix the individual burners 6 in the combustion housing 1. Is possible. However, if the burner 6 is positioned by the claw piece 123 as in the above embodiment, the holding frame is omitted and the number of parts can be reduced. In the above embodiment, the present invention is applied to a hot water supply and heating heat source machine, but the present invention is similarly applied to other combustion apparatuses in which a plurality of burners are arranged in parallel in a combustion chamber in a combustion housing. it can.

  DESCRIPTION OF SYMBOLS 1 ... Combustion housing, 11 ... Outer wall board, 12 ... Heat shield board, 121 ... Bending part, 122 ... Dripping board part, 123 ... Claw piece, 124 ... Vent, 2 ... Combustion chamber, 3 ... Supply chamber, 4 ... Partition plate, 41 ... distribution hole, 6 ... burner, 61 ... flame.

Claims (2)

A front-rear direction having a combustion casing, and having a partition plate for partitioning the space in the combustion casing into a combustion chamber and an air supply chamber below the combustion chamber, and having a flame outlet for jetting air-fuel mixture at the upper end In this combustion apparatus, a plurality of longitudinal burners are arranged side by side in the combustion chamber in parallel, and secondary air is supplied from the supply chamber to the combustion chamber through a number of distribution holes formed in the partition plate. And
The portion above the burner upper end of the front and rear walls of the combustion housing is configured in an inner / outer double structure of an outer wall plate and a heat shield covering the inner surface of the outer wall plate,
At the lower end of the heat shield plate, there is provided a hanging plate portion extending downward from the upper end of the burner via a bent portion that is bent inward in the front-rear direction, which is a direction away from the outer wall plate. The combustion device is located inward in the front-rear direction than the drooping plate portion, and a plurality of air holes through which air that flows into the gap between the drooping plate portion and the outer wall plate is ejected are formed in the bent portion. .   The combustion apparatus according to claim 1, wherein the drooping plate portion is inclined outward in the front-rear direction toward the upper side.

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