JP2005156099A - Burner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a burner which secures stable suction condition of combustion air at a mix pipe and achieving excellent combustion performance, about the burner using gas, kerosene and the like as a fuel. <P>SOLUTION: As a ring pipe 2 for communicating the mix pipe 3 for introducing premix gas in an approximate tangent line direction, a slit-shape flame port part 8 is provided in an inner peripheral face of the ring pipe 2 and a resistance body 11 for restraining counter flow of the premix gas into the mix pipe 3 and a communication part of the ring pipe from the ring pipe 2, eddy flow and vortex flow are hardly generated at the mix pipe 3 and the communication part of the ring pipe 2, combustion air is stably sucked at the mix pipe 3 and the burner capable of realizing combustion condition with flame length stabled. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a burner using gas, oil, or the like as fuel.

Conventionally, as shown in FIG. 4, this type of burner is provided with a plurality of flame ports 42 on the inner peripheral side of an annular tube 41 in which a mixing tube 40 is connected in a substantially tangential direction in a counterclockwise direction. The cross-sectional area of the annular tube 41 is gradually reduced counterclockwise from the vicinity of the connecting portion with the mixing tube 40, that is, the start end portion 43, and gradually reduced in the clockwise direction from the vicinity of the end portion 44 of the annular tube 41. The minimum cross-sectional area of the annular tube 41 is closer to the end portion 44 of the annular tube 41 than the intermediate portion of the annular tube 41. Similarly, when the premixed gas ejection pressure in the annular tube 41 is made uniform. At the same time, the compactness of the burner is ensured (see, for example, Patent Document 1).
JP 2003-279209 A

  However, in the conventional configuration disclosed in Patent Document 1, the premixed gas flows in the counterclockwise direction from the vicinity of the connecting portion with the mixing tube 40, that is, from the start end portion 43 of the annular tube 41, and from the end portion 44 of the annular tube 41. Since the premixed gas flows clockwise, the flame length corresponding to the portion where both premixed gases collide tends to change in small increments, and the flame tends to partially blow off. Accordingly, similarly, long and short flame lengths are generated, and it is difficult to obtain stable combustion performance.

  Furthermore, since the flame distribution is made uniform only by the configuration of the cross-sectional shape of the annular tube 41 itself, a part of the premixed gas is mixed counterclockwise in the mixing tube 40 and the end portion 44 of the annular tube 41. Overflowing into the connecting portion between the tube 40 and the annular tube 41, turbulent flow and vortex flow are generated in the connecting portion between the mixing tube 40 and the annular tube 41, the suction resistance of the combustion air in the mixing tube 40 increases, and the flame becomes unstable. It was difficult to stabilize the flame length because the flame from the mouth 42 intermittently caused a lengthening phenomenon to generate yellow flame.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a burner capable of ensuring a stable combustion air suction state in a mixing tube and achieving good combustion performance.

  In order to solve the above-described conventional problems, the burner of the present invention includes a mixing tube for introducing a premixed gas and an annular tube having a plurality of flame ports on an inner peripheral surface, and the mixing tube is the annular tube. And a resistor that suppresses the backflow of the premixed gas from the annular tube to the communicating portion. Then, the resistor is provided in the communicating portion of the mixing tube and the annular tube or in the annular tube in the vicinity thereof, at a position close to the mixing tube side.

  As a result, most of the premixed gas is ejected from the flame opening, and a part of the premixed gas tends to overflow into the communication portion between the mixing tube and the annular tube, but is returned to the annular tube in a low-pressure loss state by the resistor. There is almost no turbulence or vortexing at the communicating part of the annular pipe, stable combustion air is sucked in the mixing pipe, and a combustion state with a stable flame length can be realized. As described above, by providing the resistor in the annular tube, it is possible to provide a burner that can maintain a stable combustion air suction performance in the mixing tube and ensure good combustion performance.

  The burner of the present invention is a burner that suppresses the backflow of the premixed gas into the communicating portion of the mixing tube and the annular tube, ensures a stable combustion air suction state in the mixing tube, and achieves good combustion performance. Can be provided.

  A first invention includes a mixing tube for introducing a premixed gas, and an annular tube having a plurality of flame ports on an inner peripheral surface thereof, wherein the mixing tube is communicated in a substantially tangential direction of the tubular tube, By providing a resistor that suppresses the backflow of the premixed gas from the annular tube to the communicating part, most of the premixed gas is ejected from the flame opening, and part of it overflows into the communicating part of the mixing tube and the annular tube. However, since it is returned to the annular pipe by the resistor, almost no turbulence or vortexing occurs at the communication part between the mixing pipe and the annular pipe, and stable combustion air is sucked in the mixing pipe. Also, a stable combustion state can be realized with a flame length.

  The second invention is the first invention in particular, and the resistor is provided in a position close to the mixing tube side in the annular tube in the communication portion of the mixing tube and the annular tube or in the vicinity thereof. Because most of the premixed gas can be ejected from the flame port in the annular tube, and the amount of premixed gas that tends to overflow into the communicating portion between the mixed tube and the annular tube can be minimized and flow out to the vicinity of the resistor. The collision resistance between the resistor and the premixed gas can be minimized.

  The third invention is the first or second invention, in particular, the resistor is provided integrally with the annular tube, so that a part in which the annular tube and the mixing tube are integrated is formed by two upper and lower parts. The burner can be easily configured by fitting the.

  The fourth invention is the invention according to any one of the first to second inventions, and the flame mouth is formed by a plurality of slits provided on the inner peripheral surface of the annular tube, so that the flame mouth is formed by punching. Therefore, it is possible to cope with the change only by changing the punching die, and the flame area can be increased or decreased without changing the configuration of the annular tube and the mixing tube. Therefore, the maximum combustion amount of the burner can be easily changed.

(Embodiment 1)
FIG. 1 is a top view of a burner according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG. 1 in the same embodiment.

  1 and 2, the burner 1 is a sheet metal material having a thickness of 0.5 to 1 mm which is excellent in heat and corrosion resistance such as austenitic stainless steel such as SUS304, SUS316, SUS321, or ferritic stainless steel such as SUS430, SUS436 (this embodiment). In the case of the form of 0.5 to 0.6 mm), which is formed by press molding, and the annular tube 2 and the mixing tube 3 for sucking the premixed gas are communicated in the substantially tangential direction of the annular tube 2 It is. The annular tube 2 and the mixing tube 3 are formed by fitting a bottom plate 5 having an annular inner periphery in the same manner as the flame port plate 4 having an annular inner periphery, and the flame port plate 4 has an upper portion on the inner circumferential side of about 75 °. An inner peripheral flange portion 7 is formed on an annular inclined surface 6 inclined upward to an extent and an inner peripheral portion below the annular inclined surface 6. Further, the inclined surface 6 is provided with a slit-shaped flame mouth portion 8 that is vertically long and has a slit width of about 0.55 to 0.65 mm. On the other hand, the bottom plate 5 has a shape corresponding to the flame opening plate 4, the outer peripheral portion of the burner 1 is covered and fitted by the outer peripheral fitting portion 9, and the inner peripheral portion is inclined obliquely downwardly. 10 is configured to cover and surround the periphery of the flame opening plate 4 from the lower side.

  On the other hand, the resistor 11 is made of an L metal plate, and the lower surface side is fixed to the annular tube 2 by spot welding or the like. At this time, the resistor 11 is provided at or near the communicating portion of the mixing tube 3 and the annular tube 2 and close to the mixing tube 3 side. On the other hand, the slit-shaped flame opening 8 is provided at a certain distance from the upper end portion of the inclined surface 6, and the short slit flame including the short slits 14 is provided between the long slit nozzles 13 including the long slits 12. The mouth group 15 is arranged in combination.

  About the burner 1 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when the premixed gas is introduced into the burner 1 through the mixing tube 3 as indicated by the arrow, most of the premixed gas flows into the annular tube 2 counterclockwise and uniformly from the slit-shaped flame port 8. Erupts. A part of the premixed gas flows counterclockwise and tries to overflow into the communicating portion of the mixing tube 3 and the annular tube 2, but is guided by the resistor 11 and ejected from the slit-shaped flame opening 8. To do. Therefore, turbulent flow and vortex flow hardly occur in the communicating portion of the mixing tube 3 and the annular tube 2, and stable combustion air is sucked in the mixing tube 3 so that the combustion air amount ratio is stable and uniform. The premixed gas is ejected from the slit-shaped flame opening 8.

  And it is ignited by some ignition means, and forms the flame which goes to the center which was uniform and the flame length was stabilized. At this time, the slit-shaped flame opening 8 is formed of a thin slit having a slit width of about 0.55 to 0.65 mm, and thus is higher than 40 to 50% of the primary air ratio normally set by a burner for a stove or the like. Even with a primary air ratio (for example, 60 to 80%), it is difficult to backfire. Incidentally, the burner 1 is made of a stainless steel plate having excellent heat and corrosion resistance. Can be pressed in the range of 0.8 to 1.2 times the plate thickness, and the degree of freedom in selecting the flame shape can be expanded by the plate thickness. For this reason, even in the case of a fuel having a high combustion speed such as a mixture of hydrogen and air, it is easy to optimize the plate thickness of the burner 1 and the slit width of the slit-shaped flame opening 8, and the maximum combustion of the burner 1. Even when the amount is increased or decreased, it is possible to cope by changing the slit length or the number of slits.

  In the case of the present embodiment, a stainless steel plate having a thickness of 0.5 to 0.6 mm is used, and the primary air ratio is set to 65 to 70%. In this way, since the premixed gas with a high primary air ratio can be introduced uniformly, the slit-like flame port 8 of the burner 1 can form a uniform and short flame toward the center.

  As described above, the resistor 11 ensures a stable combustion air suction state in the mixing tube 3, can ensure a uniform flame balance and stable combustion performance at the same time, and can easily cope with an increase or decrease in the maximum combustion amount. The burner 1 which can be provided can be provided.

(Embodiment 2)
FIG. 3 is a top view of the burner according to the second embodiment of the present invention.

  In FIG. 3, the difference from the first embodiment is that the burner 20 is configured such that a partial cross section of the annular tube 21 is narrowed so that the premixed gas hardly passes, and this portion becomes the resistor 22. The resistor 22 is formed at a position close to or near the communicating portion of the mixing tube 3 and the annular tube 21 and close to the mixing tube 3 side.

  Note that components having the same reference numerals as those in Embodiment 1 have the same structure, and description thereof is omitted.

  About the burner 20 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  As in the first embodiment, when the premixed gas is introduced into the burner 20 through the mixing tube 3 as indicated by the arrows, most of the premixed gas flows into the annular tube 21 counterclockwise, so that the slit flame Ejected uniformly from the mouth 8. Then, a part of the premixed gas flows counterclockwise and tends to overflow into the communication portion between the mixing tube 3 and the annular tube 21. However, since the passage is gradually narrowed by the resistor 22 and is finally close to the closed state, the premixed gas is guided to the slit-shaped flame opening 8 and ejected. Therefore, turbulent flow and vortex flow hardly occur in the communicating portion of the mixing tube 3 and the annular tube 21, stable combustion air is sucked in the mixing tube 3, and the combustion air amount ratio is stable and uniform. The premixed gas is ejected from the slit-shaped flame opening 8. In addition, since the resistor 22 and the annular tube 21 have an integrated throttle structure, a part in which the annular tube 21 and the mixing tube 3 are integrated is formed by two upper and lower parts, and the number of parts is reduced by fitting them together. The burner can be easily configured.

  As described above, the burner according to the present invention prevents a change in the flame area due to thermal expansion and contraction due to combustion and the generation of abnormal noise with a relatively simple structure, and at the same time maintains good combustion performance of the burner. Therefore, it can be applied to many uses such as a cooker, a water heater, a heater, and an incinerator using this as a heating source.

The top view of the burner in Embodiment 1 of this invention The fragmentary sectional view of the AA line of the burner in Embodiment 1 of this invention The top view of the burner in Embodiment 2 of this invention Partial vertical sectional view of a conventional burner

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,20 Burner 2,21 Annular tube 3 Mixing tube 8 Slit flame part 11,22 Resistor

Claims (4)

A mixing tube for introducing premixed gas; and an annular tube having a plurality of flame ports on the inner peripheral surface thereof, wherein the mixing tube is communicated in a substantially tangential direction of the tubular tube, and the annular tube is communicated with the communicating portion. A burner provided with a resistor that prevents the premixed gas from flowing backward. 2. The burner according to claim 1, wherein the resistor is provided at a position close to the mixing tube side in the annular tube in the communication portion of the mixing tube and the annular tube or the vicinity thereof. The burner according to claim 1, wherein the resistor is provided integrally with the annular tube. The burner according to any one of claims 1 to 3, wherein the flame port comprises a plurality of slits provided on an inner peripheral surface of the annular tube.

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