TWI567342B - Combustion device - Google Patents

Description

Combustion device Field of invention

The invention relates to a combustion device, which has a combustion frame, and is provided with a combustion chamber and a gas supply chamber on the lower side of the combustion chamber in the combustion frame, and has a flame port for discharging the mixed gas at the upper end and is elongated in the front and rear direction. The burners are arranged in parallel in the lateral direction with a plurality of gaps in the combustion chamber, and the secondary air is supplied from the supply chamber to the combustion chamber.

Background of the invention

Heretofore, in such a combustion apparatus, it is known that a misalignment plate is disposed in a gap between the burners, and the arboring plate is located in front of and behind the one end portion in the rear direction of the flame opening forming region of each of the burners. In the vicinity of the upper end of the portion, the secondary air is prevented from rising (refer to Patent Document 1). Wherein, since the secondary air is difficult to flow to the upper portion of the fire plate, when the fire is transferred, a part of the mixture discharged from the flame port of one of the burners adjacent to the gap is ejected from the flame port of the other burner. A portion of the mixture is retained in the upper portion of the fire plate to promote the transfer of fire from one of the burners to the other.

Wherein, the gap between the outer side of each burner and the side edge of the fire plate is preferably the minimum required for assembling the fire plate, but sometimes it is because The gap of the burner or the fire plate is widened and the gap is widened. Further, when the gap is widened, the secondary air flows upward through the gap, and the mixed gas remaining in the upper portion of the slab is blown off by the secondary air, and the misalignment performance is deteriorated.

Advanced technical literature Patent literature

[Patent Document 1] Japanese Patent Laid-Open No. Hei 5-280715

Summary of invention

The present invention has been made in view of the above problems, and an object thereof is to provide a method for preventing deterioration of misfire performance even if a gap between each burner and a fire plate is slightly widened due to an error in the width of the burner or the fire plate. Combustion device.

In order to solve the above problems, the combustion apparatus of the present invention is configured to have a combustion frame, and to provide a combustion chamber and a gas supply chamber on the lower side of the combustion chamber in the combustion frame, and a flame port for discharging the mixed gas at the upper end and the front and rear direction A plurality of burners are arranged side by side in the lateral direction at intervals in the horizontal direction, and secondary air is supplied from the air supply chamber to the combustion chamber, wherein the moving plate is disposed in a gap between the burners. The fire transfer plate is located near the upper end of the front and rear direction portions of the one end portion of the burner in the front side of the flame mouth forming region of each of the burners, hindering the rise of the secondary air, and the fire escape plate on the outer side of each of the burners Corresponding up and down direction position, forming a lateral inward direction The groove portion of the recess is inserted into the side edge portion of the fire plate.

According to the present invention, even if there is an error in the width of the burner or the fire plate, the gap between the side of the groove portion of each burner and the side edge of the fire plate is slightly widened, and the space is passed from below the fire plate to the upper portion via the gap. Since the flow path of the secondary air is curved in the lateral direction in the groove portion, the ventilation resistance is increased, the flow rate of the secondary air flowing above the turbulence plate is not increased, and the secondary air facing the slewing plate is further provided in the groove portion. The lateral component of the flow weakens towards the upper fire. Therefore, the mixed gas remaining in the upper portion of the turbulence plate is not blown off, and the misfire performance is effectively prevented from deteriorating.

In addition, there is also a heat insulating plate having a burner platen at one end of the burner before and after the burner, and an inner surface of the upper portion of the burner of the outer wall plate before the combustion frame is covered with a gap. . In such a combustion apparatus, it is preferred that the fire plate is integrally formed on the upper edge of the burner platen or the lower edge of the heat shield. According to this, the number of parts can be reduced to achieve cost reduction.

1‧‧‧burning box

2‧‧‧ combustion chamber

3‧‧‧Air supply room

4‧‧‧ divider

5‧‧‧ burner

6‧‧‧ Gas manifold

7‧‧‧Box

8‧‧‧Ignition electrode

9‧‧‧Spread window

11‧‧‧ outer wall panels

12‧‧‧ outer wall panels

13‧‧‧ outer wall panels

14‧‧‧ Thermal insulation board

15‧‧‧ Thermal insulation board

16‧‧‧ Thermal insulation board

17‧‧‧burner platen

18‧‧‧Fireboard

18a‧‧‧Bend

31‧‧‧One air chamber

41‧‧‧Distribution hole

42‧‧‧Upright board

43‧‧‧Upper Board

44‧‧‧ openings

51‧‧‧ burner body

51a‧‧‧ side panels

51b‧‧‧Upper board

52‧‧‧burner cover

52a‧‧‧ side panels

52b‧‧ ‧Bridge

53‧‧‧ Flames

53a‧‧‧The main flame

53b‧‧‧ flame mouth

54‧‧‧Mixed Tube Department

54a‧‧‧flow entrance

55‧‧‧Main mixed gas path

56‧‧‧Fire-mixed gas path

56a‧‧‧Ventinel

57‧‧‧Ditch

58‧‧‧Depression

61‧‧‧Nozzles

Fig. 1 is a perspective view showing a first embodiment of the present invention.

Fig. 2 is a cutaway side view showing the combustion apparatus of the first embodiment.

Fig. 3 is an enlarged cross-sectional view showing the essential part taken along line III-III of Fig. 2;

Fig. 4 is a perspective view of a burner provided in the combustion apparatus of the first embodiment.

Figure 5 is a cross-sectional view of the burner cut off along line V-V of Figure 4;

Fig. 6 is a perspective view of a burner platen provided in the combustion apparatus of the first embodiment.

Fig. 7 is a cross-sectional view showing the combustion apparatus of the second embodiment.

Fig. 8 is a perspective view of a heat insulating plate provided in a combustion apparatus of a second embodiment.

Detailed description of the preferred embodiment

Referring to Fig. 1 and Fig. 2, Fig. 1 shows a combustion frame constituting a combustion apparatus comprising a heat source unit for hot water supply. The upper surface of the combustion frame 1 is open, and a hot water supply heat exchanger (not shown) is provided on the upper surface of the combustion frame 1 as an object to be heated. In the combustion frame 1, a combustion chamber 2 and a gas supply chamber 3 on the lower side of the combustion chamber 2 are provided. The air supply chamber 3 is separated from the combustion chamber 2 by a partition plate 4. The burners 5 having an elongated front-rear direction are arranged in parallel in the lateral direction with a plurality of burners 2 arranged in parallel.

A combustion fan outside the drawing 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 plurality of distribution holes 41 are formed in the partition plate 4, and the air supplied to the air supply chamber 3 is supplied to the combustion chamber 2 as secondary air through the distribution holes 41.

Further, the front end of the partitioning plate 4 is provided with an upright plate portion 42 that is curved upward, and an upper plate portion 43 that is bent forward from the upper end of the upright plate portion 42 and that reaches the front surface of the combustion frame 1. Further, at the end portion of the air supply chamber 3, a primary air chamber 31 that rises up to the upper plate portion 43 on the front side of the upright plate portion 42 is provided. In the upright plate portion 42, each opening 44 of the inflow port 54a facing the upstream end of the mixing tube portion 54 described later for each burner 5 is formed, 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 opposed to the respective openings 44, and fuel gas is supplied from the nozzles 61 to the respective openings 44, That is, the mixing tube portion 54 of each of the burners 5 is supplied with primary air from the primary air chamber 31. Further, the outer wall portion 11 on the front surface of the combustion frame 1 is provided with the frame rod 7, the ignition electrode 8, and the sight glass 9. Furthermore, the gas manifold 6 is omitted in FIG.

Further, the outer wall portion above the upper end of the burner 5 of the combustion frame 1 is strongly heated by the combustion of the burner 5. Therefore, in order to ensure the heat resistance of the combustion frame 1, the heat insulating plates 14, 15, and 16 on the front side, the rear side, and the left and right sides are provided, and the heat insulating plates 14, 15, 16 cover the combustion frame 1 with a gap therebetween. The outer surface of the front outer wall panel 11, the rear outer wall panel 12, and the left and right side outer wall panels 13 are higher than the upper surface of the upper portion of the burner 5. Further, in order to position the burner 5, a burner platen 17 that abuts against the end edge of the burner 5 is provided in the combustion frame 1.

Referring to Figures 4 and 5, the burner 5 has a burner body 51 having a pair of side plates 51a, 51a facing laterally, and a burner cover 52 having one side to the side of the burner body 51 covering from the outside on both sides of the lateral sides. 52a, 52a. Further, at the upper end of the burner 5, the flame port 53 for discharging the mixed gas is provided with a main flame port 53a and a flame introducing port 53b, and the main flame port 53a has a space in the front-rear direction to form a plurality of two for contacting the burner body 51. The upper plate 51b at the upper end of the side plates 51a, 51a, and the flame introducing port 53b are defined between the side plates 51a of the burner body 51 and the side plates 52a of the burner cover 52.

Further, the burner body 51 is provided with a mixing pipe portion 54 extending downward from the front end inlet 54a and a main mixing gas passage 55 extending from the rear end portion of the mixing pipe portion 54 in the front-rear direction and extending upward. The mixed gas of the fuel gas and the primary air that has flowed in from the inflow port 54a is guided to the main flame port 53a via the mixing pipe portion 54 and the main mixed gas passage 55. Furthermore, the burner The two side plates 51a, 51a and the upper plate 51b of the body 51 are formed by bending a single plate body.

A pilot mixture passage 56 connected to the flame introducing port 53b is provided between each side plate 51a of the burner body 51 and each side plate 52a of the combustion hood 52. Further, the vent hole 56a is located above the portion overlapping the lower portion of the side plate 52a of the burner cover 52 and communicates with the main mixed gas passage 55 and the ignited mixed gas passage 56, and is formed at a plurality of intervals in the front-rear direction at intervals. Each side plate 51a of the body 51. Further, the mixed gas branched from the main mixed gas passage 55 via the vent holes 56a is supplied to the flame introducing port 53b via the igniting mixed gas passage 56, and is kept formed by the igniting formed on the flame introducing port 53b. The main flame on the flame mouth 53a.

Further, a groove portion 57 which is located above the vent hole 56a and which is recessed inward in the lateral direction is formed in each of the side plates 52a of the burner cover 52. Thereby, the mixed gas which flows into the igniting 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 uniformity of the distribution of the mixture discharged from the flame introducing port 53b in the front-rear direction can be ensured. Further, the burner cover 52 has a bridge portion 52b that contacts the upper ends of the side plates 52a, 52a at a plurality of front and rear portions. Further, at a lower portion of the rear end of the burner body 51, a recessed portion 58 in which the burner platen 17 is engageable is formed.

Further, at the start of combustion, it is necessary to move from the burner 5 adjacent to the ignition electrode 8 to the other burner 5. Therefore, the gap between the burners 5, 5 is provided with a arboring plate 18 which is located near the upper end of the rear end portion of the flame-port forming region of each of the burners 5 and which hinders the rise of the secondary air. . Thereby, since the secondary air is difficult to flow to the upper portion of the fire plate 18, At the time of the fire, a part of the mixture which is ejected from the flame port 53 of one of the burners 5 adjacent to the gap and a part of the mixture which is ejected from the flame port 53 of the other burner 5 are partially retained in the upper portion of the turbulence plate 18. And promotes the transfer of fire from one of the burners 5 to the other burner 5.

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

Thereby, even if the gap between the side of the groove portion 57 of each burner 5 and the side edge of the fire plate 18 is widened due to the error of the lateral width of the burner 5 or the fire plate 18, it is because the gap is interposed. The flow path of the secondary air from the lower side of the turret plate 18 to the upper side is curved laterally in the groove portion 57, so that the ventilation resistance is increased, and the flow rate of the secondary air flowing above the turbulence plate 18 is not increased much, and is still in the groove portion. 57 imparts a transverse component to the flow of the secondary air above the fire plate 18, and the upward fire becomes weak. Therefore, the mixed gas remaining in the upper portion of the turbulence plate 18 is not blown off, and the misfire performance can be effectively prevented from deteriorating.

Further, in the present embodiment, as shown in Fig. 6, the igniter plate 18 is integrally formed on the upper edge of the combustion gas pressure plate 17. Thereby, the number of parts can be reduced to achieve cost reduction.

In addition, near the front end of the fire plate 18, a swirl is generated in the flow of the secondary air upward. Moreover, when the vortex reaches the upper end of the burner 5, the flammability of the burner 5 is adversely affected by the influence of the vortex. Therefore, in the present embodiment, the front end of the fire plate 18 is formed downward. The bent portion 18a is bent. Accordingly, the vortex is generated in the vicinity of the lower end of the bent portion 18a, and the position where the vortex is generated is prevented from deviating downward, and the vortex is hard to reach the upper end of the burner 5, and the combustibility of the burner 5 is deteriorated by the influence of the vortex.

Next, the second embodiment shown in Figs. 7 and 8 will be described. The basic structure of the second embodiment is not particularly different from the first embodiment, and the same components as those of the first embodiment are denoted by the same reference numerals. The difference between the second embodiment and the first embodiment is that the fire plate 18 is integrally formed on the lower edge of the heat shield 15 on the rear side, and the heat shield 15 covers the combustion frame 1 at intervals. The inner surface of the outer wall panel 12 of the face is higher than the upper portion of the upper end of the burner 5. Such a configuration can also reduce the number of parts and reduce the cost.

The embodiments of the present invention have been described above with reference to the drawings, but the present invention is not limited thereto. For example, the groove portion 57 formed in each of the side plates 52a of the burner cover 52 for uniformizing the distribution of the mixed gas to the flame-extinguishing port 53b is inserted into the side edge portion of the fire plate 18, but may be formed on the side plate 52a. A dedicated groove portion is inserted into the side edge portion of the fire plate 18.

Further, the burner 5 may be formed without the burner cover 52, in this case, as long as it is located in the lower direction corresponding to the fire plate 18 of the side plate 51a of the burner body 51 which is the outer side of the burner 5. The groove portion which is recessed in the lateral direction is formed, and the groove portion is inserted into the side edge portion of the fire plate 18. Further, the simmering plate 18 may be disposed in a gap between the burners 5, 5 so as to be located near the upper end of the front portion before and after the end portion of the burner portion forming region of each of the burners 5.

5‧‧‧ burner

18‧‧‧Fireboard

51‧‧‧ burner body

51a‧‧‧ side panels

51b‧‧‧Upper board

52‧‧‧burner cover

52a‧‧‧ side panels

53‧‧‧ Flames

53a‧‧‧The main flame

53b‧‧‧ flame mouth

55‧‧‧Main mixed gas path

56‧‧‧Fire-mixed gas path

57‧‧‧Ditch

Claims (3)

A combustion device is configured to have a combustion frame, and a gas supply chamber disposed on a lower side of the combustion chamber and the combustion chamber in the combustion frame, and a burner having a flame port for ejecting the mixed gas at the upper end and having a long front and rear direction a plurality of the combustion chambers are arranged side by side in the lateral direction, and the secondary air is supplied from the air supply chamber to the combustion chamber, and a gap plate is disposed between the burners, and the fire plate is located at the overlap Each of the burners has a burner body and a burner cover covering the burner body from both lateral sides, in the vicinity of the upper end of the front and rear direction portions of the one end portion of the burner in the front and rear direction of the burner. And the vent hole is disposed on the burner body, and the vent hole communicates with the mixed gas passage formed between the burner body and the burner cover, and the upper side of each burner cover is corresponding to the fire plate The direction position forms a groove recessed inward in the lateral direction, and the groove portion is inserted into a side edge portion of the fire plate, and the groove portion is located above the vent hole. A combustion apparatus according to claim 1, comprising a burner platen abutting one end of the burner before and after the burner, and the fire plate is integrally formed on an upper edge of the burner platen. The combustion device of claim 1, comprising a heat insulating plate which is a front wall of the outer wall plate before the burning frame is covered with a gap The inner surface of the upper portion of the burner, and the aforementioned fire plate is integrally formed on the lower edge of the heat shield.