TW201623878A - Combustion device - Google Patents

Abstract

The present invention provides a combustion device, in which a plurality of burners, each having a flame port at upper end for injecting mixed gas and being a long shape in longitudinal direction, are arranged in parallel with gaps along the transverse direction in a combustion chamber. The gap between burners is configured with a flame carry-over plate. The flame carry-over plate is disposed around a longitudinal portion of one end overlapped in the flame port forming area of each burner, so as to hamper the secondary air from rising and thus prevent the secondary air vortex generated around another end in the longitudinal direction of the flame carry-over plate causing combustion deterioration. The solution is to form a bending portion bent downwardly at another end of the flame carry-over plate so as to shift the vortex generation position away from the lower side, such that the vortex is hard to reach the upper end of the burner.

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 and the mixture discharged from the other flame port Part of it stays in the upper part of the fire plate and promotes the transfer of fire from one burner to the other.

However, in the vicinity of the other end portion of the rear direction of the fire plate (the fire plate is disposed in the rear direction portion before the end portion of the flame mouth forming region is overlapped) The front end portion of the fire transfer plate is disposed at the front end portion of the fire transfer plate when the front portion is in front of the end portion of the flame mouth forming region, and is in the flow of the secondary air upward. Create a whirlpool. Moreover, when the vortex reaches the upper end of the burner, the flammability of the burner is adversely affected by the influence of the vortex, but the countermeasure against this has not been mentioned in the past.

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 combustion apparatus capable of preventing deterioration of combustibility caused by a secondary air vortex generated in the vicinity of an end portion of a turret.

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, and a gap plate is disposed between the burners, and the fire plate is disposed. It is located near the upper end of the front and rear direction portions of the one end portion in the rear direction of the flame burner forming region of each burner, hinders the rise of the secondary air, and is formed to bend downward at the other end portion before and after the transfer plate. Bending section.

According to the invention, near the lower end of the curved portion, upwards The flow of secondary air creates a vortex. Therefore, it is possible to prevent the occurrence position of the vortex from deviating downward, and it is difficult for the vortex to reach the upper end of the burner, and the combustibility of the burner is deteriorated by the influence of the vortex.

Moreover, there is also a point in the combustion device before and after abutting the burner The burner platen at one end edge and the heat insulation plate on the inner surface of the upper portion of the burner of the rear outer wall plate before the combustion frame are 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

1 and 2, 1 is a display of a heat source machine for hot water supply A combustion frame of the combustion device. 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 figure is connected to the bottom surface of the air supply chamber 3, from the combustion The fan supplies air 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, at the front end of the partitioning plate 4, there is provided: a vertical bent upward The upright plate portion 42 and the upper portion 11 of the outer wall panel 11 that is bent forward from the upper end of the upright plate portion 42 to the front surface of the combustion frame 1 are formed. 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 each nozzle 61 to each of the openings 44, that is, the mixing pipe portion 54 of each of the burners 5, and the primary air is supplied 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.

Moreover, the outer wall portion of the upper end of the burner 5 of the combustion frame 1 is further It is heated by the combustion of the burner 5 intensively. Therefore, in order to ensure the heat resistance of the combustion frame 1, the heat insulation plates 14 on the front side, the rear side, and the left and right sides are provided. 15,16, the heat insulation panels 14, 15, 16 are the outer wall panel 11 covering the front surface of the combustion frame 1 with a gap, the rear outer wall panel 12, and the outer wall panel 13 of the left and right sides are higher than the upper end of the burner 5 The inner part of the part. 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 FIGS. 4 and 5, the burner 5 has a burner body 51, A pair of side plates 51a, 51a having a lateral confrontation; and a burner cover 52 having one side plate 52a, 52a covering one of the burner bodies 51 from the outside on the lateral sides. 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. The main flame port 53a is provided with a space in the front-rear direction to form a plurality of portions 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: from the front end inlet 54a toward The mixing pipe portion 54 at the lower rearward portion and the main mixed gas passage 55 extending from the rear end portion of the mixing pipe portion 54 in the front-rear direction and extending upward, and the mixed gas of the fuel gas and the primary air flowing in from the inflow port 54a are passed through The mixing pipe portion 54 and the main mixed gas passage 55 are guided to the main flame port 53a. Further, the side plates 51a, 51a and the upper plate 51b of the burner 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 gas cover 52. Further, the vent hole is located above the portion overlapping the lower portion of each of the side plates 52a of the burner cover 52 and communicates with the main mixed gas passage 55 and the priming gas passage 56. A plurality of side plates 51a of the burner body 51 are formed at intervals in the front-rear direction. 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.

Moreover, the side plates 52a of the burner cover 52 are formed to be located in the pass. The air vent 56a is further above and is recessed toward the inner side in the lateral direction. 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.

Also, at the beginning of the combustion, it must be burned from the ignition electrode 8 The device 5 is fired to the other burners 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 it is difficult for the secondary air to flow to the upper portion of the turbulence plate 18, a portion of the mixture discharged from the flame port 53 of one of the burners 5 adjacent to the gap and the other burner are removed during the igniting. One of the mixture of the gas discharged from the flame port 53 is retained in the upper portion of the fire plate 18 to promote the transfer of fire from one of the burners 5 to the other burner 5.

Furthermore, near the front end of the fire plate 18, in the upward secondary space The flow of gas creates a vortex. 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, at the end of the fire plate 18, the shape It becomes a bent portion 18a that is bent downward. 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.

Further, in the present embodiment, as shown in FIG. 3, the side edge portion of the fire plate 18 is inserted into the groove portion 57 formed in each of the side plates 52a of the burner cover 52. 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. Since the flow path of the secondary air from the lower side to the upper side of the turbulence plate 18 is laterally curved in the groove portion 57, 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 less likely to be blown off, and the misfire performance can be effectively prevented from deteriorating.

Further, in the present embodiment, as shown in Fig. 6, the turret 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.

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 is covered with an interval. The inner surface of the outer wall panel 12 on the rear side of the combustion frame 1 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.

Hereinabove, the embodiment of the present invention will be described with reference to the drawings. However, the invention is not limited thereto. For example, a gap between the burners 5, 5 may be disposed so as to be positioned at a front end portion of the flame port forming region of each of the burners 5. In this case, it is only necessary to form a bent portion at the rear end portion of the fire plate. Further, the present invention is also applicable to a combustion apparatus using a burner without a burner cover.

1‧‧‧burning box

2‧‧‧ combustion chamber

3‧‧‧Air supply room

4‧‧‧ divider

5‧‧‧ burner

6‧‧‧ Gas manifold

7‧‧‧Box

11‧‧‧ outer wall panels

12‧‧‧ outer wall panels

14‧‧‧ Thermal insulation board

15‧‧‧ Thermal insulation board

16‧‧‧ Thermal insulation board

17‧‧‧burner platen

18‧‧‧Fireboard

31‧‧‧One air chamber

41‧‧‧Distribution hole

42‧‧‧Upright board

43‧‧‧Upper Board

44‧‧‧ openings

54‧‧‧Mixed Tube Department

54a‧‧‧flow entrance

55‧‧‧Main mixed gas path

57‧‧‧Ditch

58‧‧‧Depression

61‧‧‧Nozzles

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 The vicinity of the upper end of the front end portion of the one end portion of the burner in the front and rear direction of the burner is formed to prevent the rise of the secondary air, and a bent portion that is bent downward is formed at the other end portion before and after the transfer plate. 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 an inner surface of a portion of the outer wall plate which is higher than the burner before the combustion frame is covered with a gap, and the fire plate is integrated Formed on the lower edge of the heat shield.