JP2016125685A - Combustion apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combustion apparatus in which a plurality of longitudinal burners 5 in a forward or rearward direction having flame ports 53 at upper ends for injecting mixture gas are arranged side-by-side with a clearance being present in a lateral direction, a flame carry-over plate 18 positioned near the upper end of forward or rearward direction portion overlapped on one end in forward or rearward in a flame port forming region in each of the burners so as to hinder ascending of secondary air is arranged at a clearance between each of the burners, it is possible to prevent deterioration of flame carry-over performance even if a clearance between each of the burners and the flame carry-over plate is widened a little due to tolerance in lateral width of the burner or the flame carry-over plate.SOLUTION: A part of an outer side surface of each of the burners 5 coinciding with a flame carry-over plate 18 is formed with a groove part 57 recessed in a lateral inner side and a side edge part of the flame carry-over plate 18 is inserted into the groove part 57.SELECTED DRAWING: Figure 3

Description

  The present invention includes a combustion housing, and a combustion chamber and an air supply chamber below the combustion chamber are provided in the combustion housing, and a longitudinal burner in the front-rear direction having a flame outlet for jetting an air-fuel mixture at the upper end is combusted. The present invention relates to a combustion apparatus in which a plurality of air chambers are arranged side by side with a gap in the lateral direction so that secondary air is raised and supplied from an air supply chamber to a combustion chamber.

  Conventionally, in this type of combustion apparatus, the secondary air rises by being positioned in the gap between the burners in the vicinity of the upper end of the front-rear direction portion that overlaps one of the front and rear ends of the flame mouth formation region of each burner. What arrange | positioned the fire transfer board which disturbs is known (for example, refer patent document 1). In this case, secondary air does not easily flow directly above the fire transfer plate, so at the time of fire transfer, a part of the air-fuel mixture ejected from the flame outlet of one adjacent burner through the gap and the other burner Part of the air-fuel mixture ejected from the flame port stays immediately above the fire transfer plate, and the fire transfer from one burner to the other burner is promoted.

  Here, the clearance between the outer surface of each burner and the side edge of the fire transfer plate is desired to be the minimum necessary for assembly of the fire transfer plate, but due to errors in the width of the burner and the fire transfer plate. The clearance may become wide. When the clearance becomes wider, the secondary air flows upward through the clearance, and the air-fuel mixture staying immediately above the fire transfer plate is blown off by the secondary air, so that the fire transfer performance is deteriorated.

JP-A-5-280715

  In view of the above points, the present invention is capable of preventing deterioration in fire transfer performance even if the clearance between each burner and the fire transfer plate is somewhat wide due to an error in the width of the burner or the fire transfer plate. An object of the present invention is to provide a combustion apparatus.

  In order to solve the above-described problems, the present invention includes a combustion casing, and the combustion casing is provided with a combustion chamber and an air supply chamber below the combustion chamber, and has a flame outlet for ejecting an air-fuel mixture at the upper end. A combustion apparatus in which a plurality of burners elongated in the front-rear direction are arranged side by side in the combustion chamber with a gap in the lateral direction, and secondary air is raised from the supply chamber to the combustion chamber. In the gap between them, located in the vicinity of the upper end of the front-rear direction portion that overlaps one end of the front and rear of the flame formation area of each burner, and disposing a fire transfer plate that obstructs the rise of secondary air, A groove portion recessed inward in the lateral direction is formed in a portion matching the fire transfer plate on the outer surface of each burner, and a side edge portion of the fire transfer plate is inserted into the groove portion.

  According to the present invention, even if the clearance between the groove side surface of each burner and the side edge of the fire transfer plate is somewhat wide due to the error in the lateral width of the burner or the fire transfer plate, The flow path of the secondary air that reaches the upper side is bent in the lateral direction in the groove, so that the airflow resistance increases, the flow rate of the secondary air that flows above the fire transfer plate does not increase so much, and the fire transfer A lateral component is imparted to the flow of secondary air directed upward of the plate at the groove, and the upward force is weakened. Therefore, the air-fuel mixture staying immediately above the fire transfer plate is not blown off so much, and the fire transfer performance can be effectively prevented from deteriorating.

  By the way, a combustion apparatus includes a burner presser plate that contacts one of the front and rear edges of the burner and a heat shield that covers the inner surface of the upper part of the front wall plate of the combustion housing with a gap therebetween. is there. In such a combustion apparatus, it is desirable to integrally form a fire transfer plate on the upper edge of the burner pressing plate and the lower edge of the heat shield plate. According to this, the number of parts can be reduced and the cost can be reduced.

The perspective view of the combustion apparatus of 1st Embodiment of this invention. The cutaway side view of the combustion apparatus of a 1st embodiment. The expanded sectional view of the principal part cut | disconnected by the III-III line | wire of FIG. The perspective view of the burner provided in the combustion apparatus of 1st Embodiment. Sectional drawing of the burner cut | disconnected by the VV line | wire of FIG. The perspective view of the burner pressing board provided in the combustion apparatus of 1st Embodiment. The cut side view of the combustion apparatus of 2nd Embodiment. The perspective view of the heat insulation board provided in the combustion apparatus of 2nd Embodiment.

  Referring to FIGS. 1 and 2, reference numeral 1 denotes a combustion casing that constitutes a combustion apparatus that includes a hot water supply heat source unit. The upper surface of the combustion casing 1 is open, and a hot water supply heat exchanger (not shown) is installed on the combustion casing 1 as an object to be heated. A combustion chamber 2 and an air supply chamber 3 below the combustion chamber 2 are provided in the combustion housing 1. The supply chamber 3 is partitioned from the combustion chamber 2 by a partition plate 4. In the combustion chamber 2, a plurality of burners 5 elongated in the front-rear direction are arranged side by side with a gap in the lateral direction.

  A combustion fan (not shown) is connected to the bottom surface of the air supply chamber 3, and 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 the air supplied to the air supply chamber 3 is raised and supplied as secondary air to the combustion chamber 2 through these distribution holes 41. .

  Further, an upright plate portion 42 bent upward and an upper plate portion 43 bent forward from the upper end of the upright plate portion 42 to reach the outer wall plate 11 on the front surface of the combustion housing 1 are provided at the front end of the partition plate 4. It has been. A primary air chamber 31 that rises so as to reach the upper plate portion 43 on the front side of the upright plate portion 42 is provided at the front end portion of the air supply chamber 3. Each upright plate portion 42 is formed with each opening 44 facing an inflow port 54 a at the upstream end of the mixing tube portion 54 described later of each burner 5, and the front surface of the primary air chamber 31 is closed by the gas manifold 6. The gas manifold 6 is provided with nozzles 61 facing the openings 44, and the fuel gas is supplied from the nozzles 61 to the openings 44, that is, the mixing pipe portions 54 of the burners 5, and the primary air chambers are provided. Primary air is supplied from 31. A frame rod 7, an ignition electrode 8, and a viewing window 9 are arranged on the outer wall plate 11 on the front surface of the combustion housing 1. In FIG. 1, the gas manifold 6 is omitted.

  Further, the outer wall plate portion above the upper end of the burner 5 of the combustion housing 1 is strongly heated by the combustion of the burner 5. Therefore, in order to ensure the heat resistance of the combustion housing 1, the inner surface of the upper portion of the outer wall plate 11 on the front surface of the combustion housing 1, the outer wall plate 12 on the rear surface, and the outer wall plate 13 on each of the left and right side surfaces above the upper end of the burner 5 The heat shield plates 14, 15, 16 on the front side, the rear side, and the left and right sides are provided. Further, in order to position the burner 5, a burner presser plate 17 that abuts against the rear edge of the burner 5 is provided in the combustion housing 1.

  4 and 5, the burner 5 includes a burner body 51 having a pair of side plates 51a, 51a facing each other in the lateral direction, and a pair of side plates 52a, 52a covering the burner body 51 from the outside on both sides in the lateral direction. The burner cap 52 is provided. A plurality of main flame ports 53a are formed on the upper plate 51b connecting the upper ends of both side plates 51a, 51a of the burner body 51 with a space in the front-rear direction as flame ports 53 for jetting air-fuel mixture at the upper end of the burner 5. And a sleeve flame opening 53 b defined between each side plate 51 a of the burner body 51 and each side plate 52 a of the burner cap 52.

  The burner body 51 is provided with a lower mixing pipe portion 54 extending rearward from the front end inlet 54a, and a main mixture passage 55 extending upward while extending in the front-rear direction from the rear end portion of the mixing pipe portion 54. Thus, the air-fuel mixture of the fuel gas and the primary air flowing in from the inflow port 54a is guided to the main flame port 53a via the mixing pipe portion 54 and the main air-fuel mixture passage 55. The both side plates 51a, 51a and the upper plate 51b of the burner body 51 are formed by bending a single plate.

  Between each side plate 51 a of the burner body 51 and each side plate 52 a of the burner cap 52, a sleeve fire gas mixture passage 56 that is continuous with the sleeve flame port 53 b is provided. Further, each side plate 51a of the burner main body 51 is positioned above a portion where the lower portion of each side plate 52a of the burner cap 52 is overlapped, and the main mixture passage 55 and the sleeve flame mixture passage 56 communicate with each other. A plurality of pores 56a are formed at intervals in the front-rear direction. Then, the air-fuel mixture diverted from the main air-fuel mixture passage 55 via these vent holes 56a is supplied to the sleeve flame outlet 53b via the sleeve-fired air-fuel mixture passage 56, and by the sleeve fire formed on the sleeve flame outlet 53b. The main flame formed on the main flame mouth 53a is held.

  Further, a groove portion 57 is formed in each side plate 52a of the burner cap 52 so as to be positioned above the vent hole 56a and recessed inward in the lateral direction. As a result, the air-fuel mixture flowing into the sleeve-fired air-fuel mixture passage 56 from the vent hole 56a is distributed in the front-rear direction at a portion below the groove portion 57, and the distribution uniformity in the front-rear direction of the air-fuel mixture ejected from the sleeve flame port 53b is uniform. Can be secured. The burner cap 52 has a bridge portion 52b that connects the upper ends of both side plates 52a, 52a at a plurality of front and rear locations. In addition, a recessed portion 58 that engages with the burner pressing plate 17 is formed at the lower rear end of the burner body 51.

  By the way, at the start of combustion, it is necessary to transfer the fire from one burner 5 facing the ignition electrode 8 to another burner 5. Therefore, a fire transfer plate that is positioned in the gap between the burners 5 and 5 in the vicinity of the upper end of the front-rear direction portion that overlaps the rear end portion of the flame mouth forming region of each burner 5 to obstruct the rise of the secondary air. 18 is provided. According to this, since it becomes difficult for the secondary air to flow directly above the fire transfer plate 18, a part of the air-fuel mixture ejected from the flame outlet 53 of one burner 5 adjacent to the other through the gap at the time of fire transfer and the other Part of the air-fuel mixture ejected from the flame port 53 of the burner 5 stays immediately above the fire transfer plate 18, and the fire transfer from one burner 5 to the other burner 5 is promoted.

  Further, in the present embodiment, as shown in FIG. 3, the fire transfer plate 18 is formed in the groove portion 57 formed at the vertical position matching the fire transfer plate 18 of each side plate 52 a of the burner cap 52 which is the outer surface of each burner 5. The side edge of the is inserted.

  According to this, even if the clearance between the side surface of the groove portion 57 of each burner 5 and the side edge of the fire transfer plate 18 becomes somewhat wide due to an error in the width of the burner 5 or the fire transfer plate 18, Since the flow path of the secondary air extending from the lower side to the upper side of the plate 18 is bent in the lateral direction in the groove portion 57, the ventilation resistance is increased, and the flow rate of the secondary air flowing above the fire transfer plate 18 is increased so much. Furthermore, a lateral component is given to the flow of the secondary air which goes upwards of the fire transfer board 18 by the groove part 57, and the upward force becomes weak. Therefore, the air-fuel mixture staying immediately above the fire transfer plate 18 is not blown off so much, and the fire transfer performance can be effectively prevented from deteriorating.

  In the present embodiment, as shown in FIG. 6, a fire transfer plate 18 is integrally formed on the upper edge of the burner presser plate 17. Thereby, the number of parts can be reduced and cost reduction can be aimed at.

  By the way, in the vicinity of the front end of the fire transfer plate 18, a vortex is generated in the flow of secondary air directed upward. When this vortex reaches the upper end of the burner 5, the flammability of the burner 5 is adversely affected. Therefore, in the present embodiment, a bent portion 18 a that is bent downward is formed at the front end of the fire transfer plate 18. According to this, a vortex is generated in the vicinity of the lower end of the bent portion 18a, the vortex generation position is shifted downward, and the vortex hardly reaches the upper end of the burner 5, and the combustibility of the burner 5 is reduced. It can be prevented from getting worse by the influence.

  Next, a second embodiment shown in FIGS. 7 and 8 will be described. The basic structure of the second embodiment is not particularly different from that of the first embodiment, and the same components as those of the first embodiment are denoted by the same reference numerals. The difference of the second embodiment from the first embodiment is that the rear heat shield 15 covers the inner surface of the portion above the burner 5 upper end of the outer wall plate 12 on the rear surface of the combustion housing 1 with a gap. That is, the fire transfer plate 18 is integrally formed on the lower edge. Even in this case, the number of parts can be reduced and the cost can be reduced.

  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 side edge portion of the fire transfer plate 18 is inserted into the groove portion 57 formed in the side plate 52a of the burner cap 52 for uniform distribution of the air-fuel mixture to the sleeve flame outlet 53b. A dedicated groove for inserting the side edge of the fire transfer plate 18 may be formed in 52a.

  Further, the burner 5 may not have the burner cap 52. In this case, the burner 5 has a horizontal position at a vertical position matching the fire transfer plate 18 of the side plate 51a of the burner body 51 which is the outer side surface of the burner 5. A groove portion recessed inward in the direction may be formed, and a side edge portion of the fire transfer plate 18 may be inserted into the groove portion. Furthermore, it is also possible to dispose the fire transfer plate 18 in the gap between the burners 5 and 5 so as to be positioned in the vicinity of the upper end of the front-rear direction portion that overlaps the front end portion of the flame mouth forming region of each burner 5. .

DESCRIPTION OF SYMBOLS 1 ... Combustion housing, 12 ... Outer wall board of rear surface, 15 ... Heat insulation board which covers outer wall board of rear surface, 17 ... Burner pressing board, 18 ... Fire transfer board, 2 ... Combustion chamber, 3 ... Supply chamber, 5 ... Burner 53 ... Flame port, 57 ... Groove.

Claims (3)

The combustion chamber is provided with a combustion chamber and a lower air supply chamber provided in the combustion chamber, and a flame burner for jetting air-fuel mixture at the upper end. A combustion apparatus in which a plurality of air gaps are arranged side by side so that secondary air is raised from the air supply chamber to the combustion chamber.
In the gap between each burner, a fire transfer plate is placed in the vicinity of the upper end of the front-rear direction part that overlaps one end of the front and rear of the flame formation area of each burner, and obstructs the rise of secondary air In
Combustion characterized in that a groove portion recessed inward in the lateral direction is formed at a vertical position matching the fire transfer plate on the outer surface of each burner, and a side edge portion of the fire transfer plate is inserted into this groove portion. apparatus.   2. The combustion apparatus according to claim 1, wherein the burner plate is provided integrally with an upper edge of the burner retainer plate, wherein the burner retainer plate is in contact with one of the front and rear edges of the burner. Combustion device characterized.   2. The combustion apparatus according to claim 1, wherein the combustion apparatus includes a heat shield plate that covers an inner surface of a portion above the burner of one of the front and rear outer wall plates of the combustion housing with a gap therebetween. The combustion apparatus is characterized in that the fire transfer plate is integrally formed.

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