JP3713838B2 - Forced exhaust type or forced supply / exhaust type combustion device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a combustion apparatus in which vibration combustion is prevented by a damper when an exhaust system is a forced exhaust system or a forced supply / exhaust system.
[0002]
[Prior art]
Conventionally, this type of combustion apparatus is generally as described in JP-A-4-36912. As shown in FIGS. 8 and 9, this apparatus is a dark and light burner unit in which a dark burner body 2 having a thick flame mouth portion 1 and a light burner body 4 having a light flame mouth portion 3 are alternately connected in the longitudinal direction. 5 is surrounded by the burner case 6 except for the rich flame mouth 1 and the pale flame mouth 3. A round hole-shaped dark inlet 7 of the dark burner body 2 faces the side surface of the burner case 6, and a long hole-shaped light inlet 8 of the light burner body 4 faces below the dark inlet 7. Yes. The burner case 6 is built in the casing 10 so as to form an air chamber 9. The fuel supply unit 11 mounted on the side surface of the casing 10 is provided with a rich nozzle 12 that ejects fuel opposed to the rich inlet 7 and a light nozzle 13 that ejects fuel opposed to the light inlet 8. The resistance plate 14 is a flat plate having a large number of communication holes 15, and is provided between the dark inlet 7 and the light inlet 8 so as to partition the air chamber 9. A fan 16 that blows air is provided at the bottom end of the casing 10. A flat light damper 17 provided in contact with the side surface of the burner case 6 opens an opening 18 having an elongated hole shape narrower than the light inlet 8. An exhaust pipe 20 is provided in the upper part of the combustion chamber 19.
[0003]
Next, the combustion operation will be described. A portion of the air supplied to the air chamber 9 by the fan 16 passes through the communication hole 15 and flows into the concentrated burner main body 2 together with the fuel ejected from the concentrated nozzle 12, and is uniformly mixed to be less than the theoretical mixing ratio. It flows out of the rich flame mouth 1 and forms an originally stable rich flame. Also, most of the air passes through the opening 18 and flows into each light burner body 4 together with the fuel ejected from the light nozzle 13, and is uniformly mixed to become a lean air-fuel mixture having a theoretical mixing ratio or more. It flows out from the part 3 and forms an inherently unstable light flame. Since the rich flame mouth part 1 and the pale flame mouth part 3 are alternately arranged, the pale flame is stabilized by the thermal influence of the rich flame from both sides, realizing a stable shade combustion as a whole. And generation | occurrence | production of Nox was reduced.
[0004]
Next, vibration combustion will be described. The main cause of the vibration combustion is a pressure fluctuation caused by the turbulence of the light flame in the combustion chamber 19 and the exhaust pipe 20, and this pressure fluctuation is transmitted to the air chamber 9 through the light burner body 4. As a result, the amount of fuel ejected from the deep nozzle 12 and the light nozzle 13 and the amount of air supplied from the fan 16 vary. When the fuel and air fluctuations are synchronized with the pressure fluctuations generated in the combustion chamber 19 and the exhaust system, oscillating combustion in which standing waves are formed in the combustion chamber 19 and the exhaust pipe 20 occurs.
[0005]
Next, the vibration combustion suppressing action of the light damper 17 will be described. Since the pressure fluctuation passing through the light burner body 4 is squeezed and attenuated by the opening 18, fluctuations in fuel and air are suppressed. Further, although it is necessary to increase the rotational speed of the fan 16 by the resistance of the light damper 17, the fan 16 has a characteristic that the flow rate fluctuation with respect to the pressure fluctuation becomes small. From the above, as a result of suppressing fluctuations in fuel and air due to vibration combustion, vibration combustion can be suppressed.
[0006]
[Problems to be solved by the invention]
However, in the conventional combustion apparatus, since the fan 16 is provided in the bottom surface of the casing 10 and in the vicinity of the left side surface 10L, the air supplied to the air chamber 9 by the fan 16 first collides with the bottom surface of the burner case 6. Next, since the air is surrounded in two directions by the left side surface 10L and the rear surface 10B of the casing 10, the air is divided into a flow along the right side surface 10R and a flow along the left side surface 10L from the rear surface 10B. Thereafter, the former air concentrates in the opening 18A on the right side surface 10R side, and as a result, the light burner body 4A on the right side surface 10R side emits a leaner air-fuel mixture that is more dilute than the other light burner bodies 4. Since it flows out more and forms a very unstable fresh flame, it has a problem of poor flammability. In particular, since the ignition of the light burner body 4A was slow at the start of combustion, there was a problem that the fire transfer between the dark burner bodies 2A and 2B was poor. On the other hand, the latter air is concentrated in the opening 18B on the left side surface 10L side. As a result, the latter air has the problem of poor combustibility and particularly poor fire transfer.
[0007]
A part of the air supplied from the fan 16 to the air chamber 9 flows across the gap between the light nozzle 13 and the opening 18. In particular, when the positions and angles of the light nozzle 13 and the opening 18 are deviated, this air pushes the fuel ejected from the nozzle 13 and the short side of the opening 18 is short. A portion of the fuel thus formed does not enter the light inlet 8 but flows into the rich burner body 2 through the through hole 15. For this reason, some of the light burner bodies 4 flow a more lean lean mixture than the other light burner bodies 4 from the light flame opening 3 to form a very unstable light flame. The dense burner body 2 of the part has a problem that the combustibility is poor because an excessively rich mixture gas flows out from the rich flame mouth part 1 to form an unstable rich flame as compared with other dense burner bodies 2. Was.
[0008]
Further, since the light damper 17 is a flat plate, a gap is easily formed between the front surface of the burner case 6 and the light damper 17 due to distortion of the light damper 17 itself. And since air approachs into this gap | interval, the air quantity to each light burner main body 4 will become non-uniform | heterogenous. As a result, a part of the light burner bodies 4 flows out of the lean mixture more lean than the other light burner bodies 4 from the light flame port 3 to form a very unstable light flame. Had the problem of being bad.
[0009]
Further, increasing the resistance of the light damper 17 by reducing the opening area of the opening 18 to further reduce the flow rate fluctuation with respect to the pressure fluctuation of the fan 16 has a large burden on the fan 16 and has a limit. Therefore, in the case of the forced exhaust method or the forced supply / exhaust method, the natural frequency of the exhaust pipe 20 is around 100 Hz, which is close to the period of pressure fluctuation, and thus there is a problem that vibration combustion is very likely to occur.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a light and dark burner unit in which a plurality of dark burner main bodies and a plurality of light burner main bodies are alternately connected in the longitudinal direction, and the surroundings except for the light burner portions of the light and dark burner units. The burner case surrounding the burner, the dark burner body's dark entrance facing the elevation of the burner case, the pale burner body's pale entrance facing the lower end of the burner case's elevation, and the burner case's elevation and bottom a casing incorporating a burner casing so as to form an air chamber comprising, a dark inlet opposite to deep nozzle for jetting fuel into a light nozzle for jetting opposed fuel pale inlet, the bottom side of the burner casing air a fan for blowing air toward the chamber, provided between the light inlet and the light nozzle, provided a narrow opening than the light entrance faces the respective light entrance, and the openings with the distance from the fan Small opening area And a forced draft type or forced air supply and exhaust type combustion equipment and a light damper.
[0011]
According to the above invention, the air supplied to the air chamber by the fan and colliding with the bottom surface of the burner case flows along the peripheral surface of the casing mainly away from the fan and concentrates in the vicinity of the opening away from the fan. . As the air leaves the fan, the air is forcibly controlled by a light damper whose opening area is reduced. Almost the same amount of air flows into each light inlet, and the same amount also flows from each light flame opening. Since the lean air-fuel mixture flows out to form a light flame, the combustibility is improved.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to a light and dark burner unit in which a plurality of dark burner main bodies and a plurality of light burner main bodies are alternately connected in the longitudinal direction, a burner case surrounding the periphery of the light and dark burner unit excluding the flame front, and a burner Forms an air chamber that includes the dark burner body's dark entrance facing the elevation of the case, the pale burner body's pale entrance facing the lower end of the burner case's elevation, and the burner case's elevation and bottom surfaces. Air is blown toward the air chamber on the bottom side of the burner case, the casing having a built-in burner case, the thick nozzle that ejects fuel facing the thick inlet, the light nozzle that ejects fuel facing the light inlet, fans and, provided between the light inlet and the light nozzle, opposite each light inlet is provided a narrow opening than the light inlet and a light damper to reduce the area of the opening with the distance from the fan with the door Braking an exhaust type or forced air supply and exhaust type combustion equipment. The air that is supplied to the air chamber by the fan and collides with the bottom surface of the burner case flows up along the peripheral surface of the casing mainly away from the fan, and the air flowing into the concentrated inlet and the opening away from the fan The air is divided into two, which are concentrated in the vicinity. In particular, the latter air is forcibly controlled by a light damper with a smaller opening area as it leaves the fan, and almost the same amount of air flows into each light inlet and the same from each light flame opening. Since a small amount of the lean air-fuel mixture flows out to form a light flame, the combustibility is improved.
[0013]
Also, except for the light and dark burner unit in which the plurality of burner bodies having a high fuel concentration and the plurality of light burner bodies having a low fuel concentration are alternately connected in the longitudinal direction, and the flame port portion of the light and dark burner unit are excluded. A burner case surrounding the periphery, a dark inlet of the dark burner body facing the elevation surface of the burner case, a pale inlet of the light burner body facing the lower end side of the elevation surface of the burner case, and the burner case A casing containing the burner case so as to form an air chamber including an upright surface and a bottom surface, a dense nozzle for injecting fuel facing each of the concentrated inlets, and a light for injecting fuel facing each of the pale inlets a nozzle, a fan for blowing air toward the air chamber of the bottom side of the burner casing, said provided between each light inlet and the light nozzle narrower than the light inlet facing to the each light inlet has an opening, One said a forced draft type or forced air supply and exhaust type combustion equipment and a light damper opening area is made small openings fans vicinity. The air supplied to the air chamber by the fan and collided with the bottom surface of the burner case immediately flows up along the peripheral surface of the casing adjacent to the fan, and concentrates in the vicinity of the air flowing into the concentrated inlet and the opening near the fan. Divided into air to do. In particular, the latter air is forcibly controlled by a light damper with a small opening area near the fan, and almost the same amount of air flows into each light inlet, and the same amount also from each light flame opening. Since the lean air-fuel mixture flows out to form a light flame, the combustibility is improved.
[0014]
Moreover, it has the light damper which made the peripheral lower end of the opening part protrude into the air chamber. The air supplied from the fan to the air chamber is guided to the lower end of the periphery of the opening projecting into the air chamber and flows mainly between the light nozzles and between the openings, and then enters the light inlet from the opening. As a result, since the downstream side of the lower end of the peripheral edge of the opening is negative, all the fuel ejected from the light nozzle also enters the light inlet from the opening. That is, the leakage of the fuel ejected from the light nozzle can be prevented, and the combustibility is stabilized.
[0015]
Moreover, it has the light damper which made the lower end of full width protrude into the air chamber. The air supplied from the fan to the air chamber is guided to the lower end of the light damper projecting into the air chamber, and once rises away from the surface of the light damper, the air enters the opening from the front. As a result, the flow of air across the opening is weak in the vicinity of the opening, and the air flows in almost the same direction as the fuel ejected from the light nozzle, so that all the fuel ejected from the light nozzle passes through the light inlet from the opening. to go into. That is, the leakage of the fuel ejected from the light nozzle can be prevented, and the combustibility is stabilized. Further, since the lower end of the light damper protrudes into the air chamber, the rigidity is strong, and there is no gap between the side surface of the burner case and the light damper due to distortion of the light damper itself. Therefore, the air quantity to each light burner main body becomes uniform, and the combustibility can be maintained.
[0016]
Embodiments of the present invention will be described below with reference to the drawings.
[0017]
(Example 1)
1 is a front sectional view of a combustion apparatus according to a first embodiment of the present invention. FIG. 2 is a side sectional view of the combustion apparatus. In the figure, reference numerals 21 and 22 denote a dark burner body having a thick flame mouth portion 23 and a light burner body having a light flame mouth portion 24. The dark and light shades in which the dark burner body 21 and the light burner body 22 are alternately connected in the longitudinal direction. The burner unit 25 is surrounded by a burner case 26 except for the rich flame mouth portion 23 and the pale flame mouth portion 24. Reference numeral 27 denotes a round hole-shaped deep inlet of the dark burner body 21, which faces the side surface of the burner case 26, and a long hole-shaped light inlet 28 of the light burner body 22 faces below the dark inlet 27. Yes. Reference numeral 29 denotes a casing, which includes a burner case 26 so as to form an air chamber 30 . A fuel supply unit 31 is mounted on the side surface of the casing 29 and includes a thick nozzle 32 that ejects fuel opposed to the rich inlet 27 and a light nozzle 33 that ejects fuel opposed to the light inlet 28. Reference numeral 34 denotes a flat resistor plate having a large number of communication holes 35, and is provided in the air chamber 30 between the deep inlet 27 and the light inlet 28. Reference numeral 36 denotes a fan for supplying air provided at the end of the bottom surface of the casing 29. Reference numeral 37 denotes a flat light damper that is in contact with the front surface of the burner case 26 and is fixed by a screw and a resistance plate 34, and opens an opening 38 having an elongated hole shape narrower than the light inlet 28. In particular, 39 is a round hole-shaped opening portion that is separated from the fan 36 and thus has a small opening area. Reference numeral 40 denotes an exhaust pipe provided in the upper part of the combustion chamber 41.
[0018]
Next, the combustion operation will be described. About 10% of the air supplied to the air chamber 9 by the fan 36 passes through the communication hole 25 and flows into the concentrated burner main body 21 together with the fuel ejected from the concentrated nozzle 32 of about 25% of the fuel. The mixture is uniformly mixed to become a rich mixture having a theoretical mixing ratio or less, and flows out of the rich flame port 23 to form an originally stable light flame. Further, about 90% of air passes through the opening 38 and flows into the light burner main body 22 together with fuel ejected from the light nozzle 33 of about 75% of the fuel, and is uniformly mixed to exceed the theoretical mixing ratio. It becomes a lean air-fuel mixture and flows out from the light flame opening 24 to form an inherently unstable light flame. Since the rich flame mouth portion 23 and the pale flame mouth portion 24 are alternately arranged, the pale flame is stabilized by the thermal influence of the rich flame from both sides, thereby realizing stable shade combustion as a whole. And generation | occurrence | production of Nox was reduced.
[0019]
The flow of air supplied from the fan 36 will be described in detail. The main flow of air supplied from the fan 36 to the air chamber 30 and colliding with the bottom surface of the burner case 26 is surrounded by the left side surface 29L and the rear surface 29B of the casing 29 in two directions, so that the rear surface 29B extends along the right side surface 29R. And the flow along the left side surface 29L. Thereafter, the former air rises along the right side surface 29 </ b> R of the casing 29 and reaches the resistance plate 34. Then, this air is further divided into two parts: air that passes through the communication hole 35 and flows into the thick inlet 27 and air that is guided by the resistance plate 34 and concentrated in the vicinity of the light inlet 28 away from the fan 36. In particular, the latter air is forcibly controlled by a light damper 37 having a smaller opening area of the opening 39 apart from the fan 36, and almost the same amount of air flows into each light inlet 28. As a result, naturally, an almost equal amount of the lean air-fuel mixture flows out of the light flame opening 24 of each light burner body 22 to form a light flame, so that the combustibility is improved. In particular, since the light burner main body 22 is ignited smoothly at the start of combustion, there is an effect that the light and dark burner unit 25 moves quickly.
[0020]
Note that the effect is not changed even if the opening 39 has other shapes. When the fan 36 is provided at the center of the bottom surface of the casing 29, it is necessary to provide openings 39 on both sides of the light damper 37. On the other hand, since almost the same amount of air flows into each light inlet 28, when a guide plate or the like is provided in the air chamber 30 instead of such an irregular light damper 37, each light inlet 28 is caused by variation in assembly. Inflow of the same amount of air into the air is difficult, and the cost is increased by adding parts.
[0021]
(Example 2)
FIG. 3 is a front side sectional view of a combustion apparatus according to Embodiment 2 of the present invention. The difference from the first embodiment is that a light damper 46 having an opening 43 narrower than the light inlet 42 and a small opening area of the opening 45 in the vicinity of the fan 44 is provided in contact with the front surface of the burner case 47. In addition, the thing of the same code | symbol as Example 1 has the same structure, and abbreviate | omits description.
[0022]
Next, the flow of air supplied from the fan 44 will be described in detail. The main flow of air supplied from the fan 44 to the air chamber 30 and colliding with the bottom surface of the burner case 47 is surrounded by the left side surface 29L and the rear surface 29B of the casing 29 in two directions. And the flow along the left side surface 29L. Thereafter, the latter air rises along the right side surface 29 </ b> L of the casing 29 and reaches the resistance plate 34. Then, this air is further divided into two parts, that is, air that passes through the communication hole 35 and flows into the concentrated inlet 27 and air that is guided by the resistance plate 34 and concentrated near the opening 45 near the fan 44. In particular, the latter air is forcibly controlled by a light damper 46 having a smaller opening area of the opening 45 away from the fan 44, and almost the same amount of air flows into each light inlet 42. As a result, naturally, an almost equal amount of the lean air-fuel mixture flows out of the light flame opening 24 of each light burner body 22 to form a light flame, so that the combustibility is improved. In particular, since the light burner main body 22 is ignited smoothly at the start of combustion, there is an effect that the light and dark burner unit 25 moves quickly.
[0023]
(Example 3)
FIG. 4 is an enlarged side cross-sectional view of a main part of a combustion apparatus according to Embodiment 3 of the present invention. The difference from the first embodiment is that a light damper 50 having a comb-shaped portion in which the lower end 48A of the peripheral edge 48A of the opening 48 is cut and raised into the air chamber 49 is provided in contact with the front surface of the burner case 51. In addition, the thing of the same code | symbol as Example 1 has the same structure, and abbreviate | omits description.
[0024]
Next, the flow of air supplied from the fan 36 will be described in detail. The air supplied from the fan 36 to the air chamber 49 and colliding with the bottom surface of the burner case 51 flows upward in the direction of the end mainly along the bottom surface of the burner case 51 and then reaches the resistance plate 34. At that time, the air is guided to the lower peripheral edge 48A of the opening 48 projecting into the air chamber 49 and mainly flows between the light nozzles 33 and between the openings 48, and then enters the light inlet 28 from the opening 48. . As a result, since the downstream side of the peripheral lower end 48 </ b> A of the opening 48 becomes negative pressure, all the fuel ejected from the light nozzle 33 enters the light inlet 28 through the opening 48. That is, the fuel ejected from the light nozzle 33 can be prevented from leaking to other than the light inlet 28, and the combustibility is stabilized. In other words, unlike the first embodiment in which air is forcibly controlled, the fuel is reliably controlled.
[0025]
(Example 4)
FIG. 5 is an enlarged side sectional view of an essential part of a combustion apparatus according to Embodiment 4 of the present invention. The difference from the first embodiment is that the entire width of the lower end 52A of the light damper 52 is bent and protruded into the air chamber 53, and this light damper 52 is provided in contact with the front surface of the burner case 54. In addition, the thing of the same code | symbol as Example 1 has the same structure, and abbreviate | omits description.
[0026]
The air supplied from the fan 36 to the air chamber 53 is guided to the lower end 52A of the light damper 52 protruding into the air chamber 53 and mainly forced along the fuel supply portion 31, in other words, once forced from the surface of the light damper 52. After being separated, the opening 38 is entered from the front. That is, in the vicinity of the opening 38, the flow of air across the opening 38 itself is weak, and the air flows in substantially the same direction as the fuel ejected from the light nozzle 33, so that the fuel ejected from the light nozzle 33 leaks. Can be prevented, and flammability is stabilized. Further, since the light damper 52 has the lower end 52A protruding into the air chamber 53, the light damper 52 has high rigidity, and there is no gap between the front surface of the burner case 54 and the light damper 52 due to distortion of the light damper 52 itself. Therefore, the air quantity to each light burner main body 22 becomes uniform, and combustibility can be maintained.
[0027]
Note that the fuel ejected from the light nozzle 33 collides with the air rising along the fuel supply unit 31, but since it is just after ejection, the inertial force of the fuel is strong, and the fuel can go straight without flowing. However, there is a problem that the passage resistance of the air chamber 53 is large because the lower end 52A of the light damper 52 is bent into the air chamber 53 to protrude. On the other hand, in order to reduce the passage resistance, when the lower end 52A is formed in a comb shape as in the second embodiment, the rigidity is small and the distance from the opening 38 is small, so the fuel leakage preventing effect is small.
[0028]
(Example 5)
6 is an enlarged side cross-sectional view of a main part of a combustion apparatus according to a fifth embodiment of the present invention. The difference from the first embodiment is that a light damper 57 in which the peripheral edge 55A of the opening 55 is protruded into the light inlet 56 is provided. In particular, the back surface of the peripheral edge 55 </ b> A of the opening 55 is provided in contact with the front surface of the burner case 58. In addition, the thing of the same code | symbol as Example 1 has the same structure, and abbreviate | omits description.
[0029]
Next, the vibration combustion suppressing action of the light damper 57 will be described. Pressure fluctuations caused by the turbulence of the light flame are generated in the exhaust pipe 40 and the combustion chamber 41, and the pressure fluctuations are transmitted to the air chamber 30 through the light burner body 22. On the other hand, since the peripheral edge 55A of the opening 55 is protruded into the light inlet 56, the reverse passage from the opposite light burner body 22 to the air chamber 30 as compared with the forward passage resistance from the air chamber 30 to the light burner body 22. The resistance is significantly increased. Accordingly, the pressure fluctuation passing through the light burner main body 22 is throttled by the peripheral edge 55A of the opening 55 and sufficiently attenuated, so that fluctuations in fuel and air are prevented. Therefore, as a result of preventing fluctuations in fuel and air due to vibration combustion, vibration combustion can be prevented. Further, since the forward passage resistance is small, the load on the fan 36 is also small. Further, since the peripheral edge 55 </ b> A of the opening 55 is in contact with the side surface of the burner case 58, air always flows from the opening 55 to the light inlet 56. Therefore, the air quantity to each light burner main body 22 becomes uniform, and combustibility can be maintained.
[0030]
(Example 6)
FIG. 7 is an enlarged side sectional view of a main part of a combustion apparatus according to Embodiment 6 of the present invention. The difference from the first embodiment is that it has a closed space 62 provided in communication with a throttle opening 61 opened in the vicinity of the fuel inlet 60 of the fuel supply unit 59. In addition, the thing of the same code | symbol as Example 1 has the same structure, and abbreviate | omits description.
[0031]
Next, the vibration combustion suppression action of the enclosed space 62 will be described. Pressure fluctuation due to the disturbance of the light flame occurs in the exhaust pipe 40 and the combustion chamber 41, and this pressure fluctuation is transmitted to the air chamber 30 through the light burner body 22. Next, the pressure fluctuation transmitted to the air chamber 30 reaches the fuel supply unit 59 from the light nozzle 33. The pressure fluctuation reaching the fuel supply unit 59 is absorbed into the closed space 62 from the throttle port 61. That is, the closed space 62 from the throttle port 61 acts as a Helmholtz type sound absorber. Therefore, as a result of preventing the fluctuation of the fuel due to the vibration combustion, the vibration combustion can be suppressed.
[0032]
【The invention's effect】
As described above, the present invention has the following advantageous effects.
[0033]
(1) Since the light damper with the opening area of the opening made smaller as it gets away from the fan is provided, of course, substantially the same amount of air flows into each light burner body, and the combustibility is improved.
[0034]
(2) Since the light damper having a small opening area in the vicinity of the fan is provided, it is natural that almost the same amount of air flows into each light burner body, thereby improving the combustibility.
[0035]
(3) Since the lower end of the periphery of the opening of the light damper is protruded into the air chamber, leakage of fuel ejected from the light nozzle can be prevented, and the combustibility is stabilized.
[0036]
(4) Since the lower end of the full width of the light damper is protruded into the air chamber, leakage of fuel ejected from the light nozzle can be prevented, and the combustibility is stabilized. Further, since the rigidity is strong and there is no gap between the side surface of the burner case and the light damper due to distortion of the light damper itself, the amount of air to each light burner body becomes uniform.
[Brief description of the drawings]
FIG. 1 is a front sectional view of a combustion apparatus according to Embodiment 1 of the present invention. FIG. 2 is a side sectional view of the apparatus. FIG. 3 is a front sectional view of a combustion apparatus according to Embodiment 2 of the present invention. FIG. 5 is an enlarged side cross-sectional view of the main part of the combustion apparatus of Example 3 of the present invention. FIG. 5 is an enlarged side cross-sectional view of the main part of the combustion apparatus of Example 4 of the present invention. Enlarged side sectional view [Fig. 7] Enlarged side sectional view of the main part of the combustion apparatus of Example 6 of the present invention [Fig. 8] Front sectional view of a conventional combustion apparatus [Fig. 9] Side sectional view of the apparatus [Explanation of symbols] ]
21 Dark Burner Body 22 Light Burner Body 23 Deep Flame Port 24 Light Flare Port 25 Dark Burner Unit 26, 47, 51, 54, 58 Burner Case 27 Deep Inlet 28, 42, 56 Light Inlet 29 Casing 30, 49, 53 Air chamber 31, 59 Fuel supply unit 32 Deep nozzle 33 Light nozzle 34 Resistance plate 36, 44 Fan 37, 46, 50, 52, 52A Light damper 38, 39, 43, 45, 48, 48A, 55 Opening

Claims (4)

A dark and light burner unit in which a plurality of dark burner bodies having a high fuel concentration and a plurality of light burner bodies having a low fuel concentration are alternately connected in the longitudinal direction, and the periphery except for the flame mouth portion of the light and dark burner unit. A surrounding burner case, a dark inlet of the dark burner body facing the elevation surface of the burner case, a light inlet of the light burner body facing the lower end side of the elevation surface of the burner case, and the standing of the burner case A casing containing the burner case so as to form an air chamber including a surface and a bottom surface ; a thick nozzle that ejects fuel facing each of the thick inlets; and a light nozzle that ejects fuel facing each of the light inlets , for blowing air toward the air chamber of the bottom side of the burner case fan and said provided between each light inlet and the light nozzle, said opposite each light entrance the light smaller than the inlet opening It has, and before Forced draft type or forced air supply and exhaust type combustion equipment and a pale damper having a small opening area of the openings as the distance from the fan. A dark and light burner unit in which a plurality of dark burner bodies having a high fuel concentration and a plurality of light burner bodies having a low fuel concentration are alternately connected in the longitudinal direction, and the periphery except for the flame mouth portion of the light and dark burner unit. A surrounding burner case, a dark inlet of the dark burner body facing the elevation surface of the burner case, a light inlet of the light burner body facing the lower end side of the elevation surface of the burner case, and the standing of the burner case A casing containing the burner case so as to form an air chamber including a surface and a bottom surface ; a thick nozzle that ejects fuel facing each of the thick inlets; and a light nozzle that ejects fuel facing each of the light inlets , for blowing air toward the air chamber of the bottom side of the burner case fan and said provided between each light inlet and the light nozzle, said opposite each light entrance the light smaller than the inlet opening It has, and before Forced draft type or forced air supply and exhaust type combustion equipment and a pale damper to reduce the area of the opening of the fan near. The forced exhaust type or forced supply / exhaust type combustion apparatus according to claim 1, further comprising a light damper having a lower end of the periphery of the opening projecting into the air chamber. The forced exhaust type or forced supply / exhaust type combustion apparatus according to claim 1, further comprising a light damper having a lower end of the entire width protruding into the air chamber.

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