JP5513151B2 - Tubular flame burner - Google Patents

Description

The present invention is, from the opened slit along the tube axis direction on the side surface of the cylindrical combustion chamber, toward the tangential direction of the combustion chamber, the fuel gas and air, a mixture of fuel gas and air, the air In addition, the present invention relates to a tubular flame burner that swirls and burns an air-fuel mixture of fuel gas and air or an air-fuel mixture of fuel gas and air and fuel gas and air facing each other.

  In recent years, it has been possible to reduce the size of the external shape and to burn various fuels such as gases, liquids, or finely divided solids that can be applied to industrial, commercial, and household combustion equipment. A tubular flame burner is used as a combustor. Such a tubular flame burner is configured such that a fuel gas and air are individually supplied to the combustion chamber from a slit opened along the tube axis direction of the cylindrical combustion chamber, or each of the fuel gas and air. The air-fuel mixture or the fuel gas and the air are combined individually and combined with the fuel gas and air to be eccentrically introduced and swirl-combusted (see, for example, Patent Document 1).

Japanese Patent No. 3358527

Tubular flames are generally said to burn in a laminar flow. However, since the slit for supplying the premixed gas or the fuel gas or air is long in the direction of the tube axis of the combustion chamber, the degree of freedom in which the flow rate fluctuates in that direction remains. Therefore, in either premixed combustion or diffusion combustion, turbulent fluctuations in the tube axis direction occur in the flow rate of the premixed gas or fuel gas or air supplied from the slit, and combustion noise is generated. In diffusion combustion tubular flame burners where mixing is promoted in the combustion chamber, fluctuations in the flow rate of the fuel gas or air can cause fluctuations in the concentration of the mixture formed in the combustion chamber, leading to combustion instability and combustion noise generation. is there.
The open-ended tubular flame burner with both ends in the tube axis direction of the combustion chamber has a stable flame with no flow in the tube axis direction at the center of the tube axis direction, which plays a role of holding the flame Forms a stable flame that is extremely difficult to blow away. However, the closed-end tubular flame burner has no flow in the tube axial direction at the closed end, but is cooled by the closed wall and generates frictional resistance against swirling flow. A stable flame without air is difficult to form and is more unstable in combustion and flow than a tubular flame burner with open ends.

  The present invention has been made in view of the above-mentioned problems, and its purpose is mainly to stably burn a one-end closed tubular flame burner to expand the blow-off limit of the flame and to open both ends and one-end closed. It is intended to suppress combustion noise caused by turbulent fluctuations in the flow velocity in the tube axis direction at the slit generated in the tubular flame burner.

The tubular flame burner according to the present invention allows fuel gas and air to flow between a fuel gas and air in a tangential direction of the combustion chamber from a slit opened along a tube axis direction on a side surface of a cylindrical combustion chamber. The air-fuel mixture is swirled by causing the air-fuel mixture of air and fuel gas and air, or the fuel gas and air-fuel gas and air-fuel mixture to face each other, and its characteristic configuration is: The flow path adjacent to the opening where the slit opens toward the combustion chamber includes a subdivided portion that is subdivided into a plurality of portions in the tube axis direction by a partition wall , and the opening of the slit and the opening thereof The point immediately upstream in the gas flow direction in the portion is a continuous slit portion composed of a single slit .

That is, the flow path close to the opening where the slit opens toward the combustion chamber includes a subdivided portion that is subdivided into a plurality of portions in the tube axis direction by the partition wall. In other words, the slits are subdivided by the partition walls and become aggregates of narrow pipe lines formed in the pipe circumferential direction and arranged in the pipe axis direction, so that fluctuations in the flow in directions other than the main stream are prevented, resulting in fuel gas and air Or the flow velocity fluctuation | variation of the slit longitudinal direction of an air-fuel | gaseous mixture is suppressed. As a result, in premixed combustion, turbulent fluctuations in the mixture flow are suppressed, and in diffusive combustion, turbulent fluctuations in the flow of fuel gas and air and resulting fluctuations in fuel concentration are suppressed. As an effect, combustion instability and combustion noise can be suppressed in both open-ended and open-ended tubular flame burners. In particular, the effect is great in the one-end closed tubular flame burner in which the formation position of the flame is difficult to stabilize.
Further, when the partition wall reaches the combustion chamber wall, a portion where fuel, air, or an air-fuel mixture does not flow is generated by the partition wall, and a portion having a nonuniform speed and concentration is formed in the tubular flame. Specifically, the observed flame may have a striped pattern. Further, when the blowout flow rate is slow and the partition walls are thick, a flame may adhere to the partition walls and the combustion chamber wall may be overheated. In the former case, it does not immediately cause an adverse effect, and in the latter case, it is not a problem if it is used without such combustion conditions. However, there is a possibility that such a situation will occur. There is no better way to prevent it. Therefore, in this feature configuration, only the portion in contact with the combustion chamber wall is a continuous slit portion that does not have a subdivided portion and is a continuous opening, thereby maintaining the original slit shape. However, the flow may be subdivided only in the upstream portion.
Specifically, when a plurality of thin plate-like members arranged perpendicularly to the longitudinal direction of the slit are used as the partition walls, the downstream end of the plate-like member is placed at a position slightly spaced from the combustion chamber opening. When the remaining part is cut and processed to form a partition wall, the partition wall part of the continuous opening is cut from the combustion chamber opening part to the immediately upstream part to return to the original slit shape.
Accordingly, the original purpose of suppressing a large flow change in the slit longitudinal direction can be achieved while diminishing the negative effect as described above by providing the partition wall, thereby suppressing combustion instability and combustion noise. It has become possible to obtain a tubular flame burner that can.

  A further characteristic configuration of the tubular flame burner according to the present invention includes, in addition to the above-described characteristic configuration, a thin plate-like member in which a plurality of partition walls of the subdivided portion are arranged perpendicular to the longitudinal direction of the slit. There is in point.

That is, by providing a thin plate-like member perpendicular to the longitudinal direction of the slit, it is possible to suppress large fluctuations in the flow of fuel, air or air-fuel mixture in the longitudinal direction of the slit. This makes it possible to suppress combustion instability and combustion noise.
In the tubular flame burner, the wall of the combustion chamber is kept at a relatively low temperature. Therefore, taking advantage of this feature, the partition wall can be made of a thin metal plate of about 2 mm or less, for example. The purpose of thin plate-like members is to prevent large fluctuations in the flow of fuel, air, or air-fuel mixture in the longitudinal direction of the slit, so it is reasonable to provide partition walls with a slit width or an interval within about 10 times the slit width. . In addition, the thin plate-like member constituting the partition walls can be maintained at an expected value by separating the partition walls into, for example, a lattice shape or a honeycomb shape.

  The tubular flame burner according to the present invention is further characterized in that, in addition to the above-described characteristic configuration, the slit is a cutting opening formed by cutting a part of the combustion chamber constituting member constituting the cylindrical combustion chamber. The partition wall of the slit sub-divided portion formed is formed by cutting and leaving a part of the cutting opening.

  That is, in the case where the combustion chamber of the tubular flame burner is a molded member in which a thick material or a flow path of fuel, air, or an air-fuel mixture is integrated, cutting by cutting a part of the combustion chamber constituent member A slit can be formed at the opening. Therefore, according to this characteristic configuration, a part of the cutting opening is left to be cut and a small hole is provided which is continuous in the pipe circumferential direction and arranged in the pipe axis direction over the longitudinal direction of the slit. The remaining portion can be used as a partition, and an introduction path substantially equivalent to a slit that is subdivided across a plate-like partition can be formed. This makes it possible to form the partition wall only by changing the processing method without requiring any additional members, and to reduce the cost required to create the partition wall while suppressing instability of combustion and combustion noise. It became possible to obtain a flame burner.

  A further characteristic configuration of the tubular flame burner according to the present invention is that, in addition to the above-described characteristic configuration, the end portion in the longitudinal direction of the partition wall in the subdivision portion is formed with a corner portion in a curved shape in a sectional view. is there.

That is, if the thickness of the subdividing member of the flow path is large, there is a possibility that the generation of noise and an increase in pressure loss may occur acoustically due to vortices generated in the wake of the member. Therefore, in this characteristic configuration, for example, by rounding the upstream end and the downstream end in the longitudinal direction of the members constituting the partition wall, generation of Karman vortex can be suppressed and noise and pressure loss can be reduced. It is ideal if the shape of the subdividing member in contact with the flow of fuel, air, or air-fuel mixture can be streamlined.
As a result, the adverse effect of providing the partition walls can be further eliminated, contributing to stabilization of combustion and reduction of combustion noise.

The perspective view of the tubular flame burner in 1st Embodiment of this invention. II-II sectional view in FIG. III-III sectional view in FIG. Assembly perspective view of tubular flame burner in the first embodiment of the present invention The figure which shows the slit formation member for air in 1st Embodiment of this invention. The figure which shows the slit formation member for air in 2nd Embodiment of this invention.

[First Embodiment]
Hereinafter, a tubular flame burner according to a first embodiment of the present invention will be described based on the drawings.
As shown in FIGS. 1 to 3, the tubular flame burner 1 according to the first embodiment of the present invention has an opening in which one end is closed by an end plate 40 (blocking wall) and the other end is provided in the front flange 50. A cylindrical combustion chamber N opened at the section, and an air slit 22s and a gas slit 32s that open along the tube axis direction (Y direction in the figure) on the side surface of the cylindrical combustion chamber N. It is a so-called one-end closed tubular flame burner. Then, the fuel gas and the air are eccentrically introduced separately from the air slit 22 s and the gas slit 32 s toward the tangential direction of the side wall of the combustion chamber N, and swirl combustion is performed.

  Here, a direction along the tube axis direction of the combustion chamber N is simply expressed as a tube axis direction (Y direction in the drawing), and a direction orthogonal to the tube axis direction is expressed as a tube circumferential direction (X direction in the drawing). . Further, in the formed tubular flame, the closed side end portion side of the combustion chamber N that is the base end side is the upstream side in the tube axis direction, and the open end side of the combustion chamber N that is the flame ejection side is the downstream side in the tube axis direction. Called.

  As shown in FIG. 4, the cylindrical combustion chamber N is formed by combining and attaching an air slit forming member 22 and a gas slit forming member 32. In this embodiment, two air slit forming members 22 and two gas slit forming members 32 are combined. Then, with respect to the cylindrical combustion chamber N formed by combining the air slit forming member 22 and the gas slit forming member 32, an end plate 40 is attached to one end side in the tube axis direction, and the other end side. By attaching a front flange 50 having an opening 50h to the combustion chamber N, one end in the tube axis direction is closed and the other end is opened. The end plate 40 is formed in a disc shape, and the spark plug hole 40a and the frame rod hole 40b are formed in a separated state. And it is comprised so that the ignition plug and flame | frame rod which are not shown in figure through the exterior and the inside of the combustion chamber N may be attached. The front flange 50 also serves as a flange for attaching the burner to the heat utilization device.

In this embodiment, although not shown, each member is configured to be fixed by screwing. However, the mounting method is not limited to such a method, and each member is provided with a fitting portion and a fitted portion, and a fitting and fitting form or a combination of fitting and screwing is used. Various attachment methods can be applied as long as the heat resistance strength such as form is not impaired.
Hereinafter, in the tube axis direction, an end side to which the end plate 40 is attached is referred to as a closed end side, an end side to which the front flange 50 is attached is referred to as an open end side, and an end portion closed by the end plate 40 is referred to as a closed side end. Part.

  Further, the air chamber 20 is attached to the outside of the air slit forming member 22 in the radial direction of the combustion chamber N with the air orifice 21 fitted therein, and the gas slit forming member 32 is arranged outside of the combustion chamber N in the radial direction. The gas chamber 30 is attached in a state where the gas orifice 31 is fitted. Although not shown, a supply pipe for supplying air is connected to the air chamber 20, and a blower fan or a blower is attached to the supply pipe to take in external air as an oxygen-containing gas and supply the air. It is configured to pump into a tube. The oxygen-containing gas is used as an oxidant for burning fuel gas, and an oxygen-containing gas other than external air can also be used. Although not shown, the gas chamber 30 is connected to a supply pipe for supplying fuel gas.

  As shown in FIG. 3, the air injected into the combustion chamber N is introduced into the space 22v from the through hole 21h provided in the air orifice 21 and passes through the air slit 22s. It is ejected in the tangential direction of the cylindrical combustion chamber N. With respect to the fuel gas ejected into the combustion chamber N, the fuel gas introduced into the gas chamber 30 is guided to the space 32v from the through hole 31h provided in the gas orifice 31, and passes through the gas slit 32s to form a cylindrical combustion chamber. N is ejected in the tangential direction. In this way, the combustion chamber N is configured to be eccentrically introduced separately into the fuel gas and air, and swirl and burned.

The air slit forming member 22 and the gas slit forming member 32 will be described.
As shown in FIG. 5, the air slit forming member 22 includes a peripheral wall forming portion 22 a that is a portion corresponding to ¼ of the peripheral wall in the cylindrical combustion chamber N and a linear portion 22 b other than that. Has been. Similarly to FIG. 5, the gas slit forming member 32 includes a peripheral wall forming portion that is a portion corresponding to ¼ of the peripheral wall in the cylindrical combustion chamber N, and other linear portions. ing. And as shown in FIG.3 and FIG.4, the cylindrical combustion chamber N is formed by combining four in the state which each opposes. Hereinafter, a member in which the combustion chamber N is formed by combining the air slit forming member 22 and the gas slit forming member 32 may be referred to as a combustion chamber forming portion M.

As shown in FIG. 5, a concave portion serving as an air introduction path is provided on the outer wall surface of the peripheral wall forming portion 22 a of the air slit forming member 22, and the peripheral wall forming portion 22 a of the air slit forming member 22 is formed. A slit forming recess 22c is provided at the end.
Although not shown in the figure, as in FIG. 5, a concave portion serving as a gas introduction path is provided on the surface on the outer peripheral wall side of the peripheral wall forming portion of the gas slit forming member 32. A slit forming recess is provided at the end of the peripheral wall forming portion.
As shown in FIG. 4, the slit forming recess 22 c is formed on the peripheral wall surface that becomes the combustion chamber N when the combustion slit forming member M is configured by combining the slit forming member 22 for air and the slit forming member 32 for gas. Open along the axial direction. That is, the opening formed by the slit forming recess 22c of the air slit forming member 22 becomes the air slit 22s. Similarly, the opening formed by the slit forming concave portion of the gas slit forming member 32 becomes the gas slit 32s.

  Each of the air slit forming member 22 and the gas slit forming member 32 is integrally formed by casting or the like, for example. The slit forming recess 22c of the air slit forming member 22 is formed by cutting the end of the peripheral wall forming portion 22a of the integrally formed air slit forming member 22, and the slit of the gas slit forming member 32 is formed. The formation recess is formed by cutting the end of the peripheral wall forming portion of the gas slit forming member 32 formed integrally therewith.

When the description is added, as shown in FIG. 5, the end of the peripheral wall forming portion 22a is continuous from the outer surface of the peripheral wall forming portion 22a of the air slit forming member 22 to the inner surface of the peripheral wall. The slit forming recess 22c is formed by cutting.
Moreover, although illustration is abbreviate | omitted, the edge of the surrounding wall formation part in the state which continues from the surface of the surrounding wall outer side of the surrounding wall formation part of the gas slit formation member 32 to the surface of the surrounding wall inner side similarly to FIG. A slit forming recess is formed in the part by cutting.

  The cutting depth of the slit forming recess 22c of the air slit forming member 22 is about 1/3 of the interval between adjacent partition walls 22k (see FIGS. 5 and 6). Similarly, the cutting depth of the slit forming recess is set to about 1/3 of the interval between adjacent partition walls.

  The gas orifice 31 is formed in a plate shape as shown in FIG. The gas orifice 31 is arranged in the tube axis direction on the peripheral wall forming portion side of the gas slit forming member 32 and is spaced from both ends in the tube axis direction of the gas orifice 31 and closer to the center portion. In this way, three through holes 31h are formed at equal intervals.

The gas chamber 30 is provided with a gas introduction space, and the gas introduction space is provided with two gas supply holes spaced apart in the tube axis direction. The gas chamber 30 is configured to be attachable to the gas slit forming member 32 in a state in which the gas orifice 31 is fitted.
Accordingly, the fuel gas introduced into the gas introduction space of the gas chamber 30 passes through the three through holes 31 h of the gas orifice 31, the surface on the outer peripheral wall side of the peripheral wall forming portion of the gas slit forming member 32, the gas orifice 31 and the space 32v surrounded by the linear portion 22b of the slit forming member 22 for air. As described above, the through hole 31h is provided closer to the central portion of the gas orifice 31 in the tube axis direction, and the distribution of the fuel gas is intended to be a high concentration in the central portion of the combustion chamber N. doing.

  The air orifice 21 is formed in a plate shape as shown in FIG. Then, four through holes 21h are formed at equal intervals in the air orifice 21 on the side of the peripheral wall forming portion 22a of the air slit forming member 22 in a state of being aligned in the tube axis direction.

The air chamber 20 is provided with an air introduction space, and an air supply opening 20a is provided on a side surface side of the air introduction space. And the air chamber 20 is comprised so that attachment to the slit formation member 22 for air is possible in the state which the air orifice 21 fits.
Therefore, the air introduced into the gas introduction space of the air chamber 20 passes through the four through holes 21h provided in the air orifice 21 and is a surface on the outer peripheral wall side of the peripheral wall forming portion 22a of the air slit forming member 22. The air orifice 21 and the gas slit forming member 32 are introduced into the space 22v surrounded by the linear portions. As described above, the through holes 21h are provided so as to be evenly arranged in the tube axis direction of the air orifice 21, and the distribution of the amount of air to be ejected is uniform over the tube axis direction of the combustion chamber N. It becomes.

  In this way, in the one-end closed tubular flame burner 1 according to the present invention, as shown by A1 in FIG. 2, a part of the air introduced into the air introduction space of the air chamber 20 is removed from the gas side through small hole. 21b, through-hole 22h, space 32v, and gas slit 32s are introduced into the closed end of the combustion chamber N in the tube axis direction so that air is introduced into the closed end of the combustion chamber N in the tube axis direction. Yes. 2, a part of the air introduced into the air introduction space of the air chamber 20 passes through the gas side through large hole 21a, the through hole 22h, the space 32v, and the gas slit 32s to the combustion chamber N. It is introduced at the open end of the tube axis direction.

Hereinafter, the characteristic configuration of the tubular flame burner according to the first embodiment of the present invention will be described.
In this first embodiment, as shown in FIGS. 5A and 5B, a thin plate-like member is supported by the support member 22m in the slit-forming recess 22c of the air slit-forming member 22. A plurality of (partition walls 22k) are arranged in a state of being separated from each other in the tube axis direction perpendicular to the longitudinal direction of the air slit 22s. Although not shown in the figure because of the same configuration, a thin plate-like member (partition wall) is placed in the longitudinal direction of the gas slit 32s while being supported by the support member in the slit forming recess of the gas slit forming member 32. A plurality of sheets are arranged vertically apart. The plate member (partition wall 22k) is a subdivided portion that subdivides the flow path of the air slit 22s. Similarly, the plate member (partition wall) disposed in the slit forming recess of the gas slit forming member 32 is The sub-divided portion subdivides the flow path of the gas slit 32s.

  In forming the partition 22k in the air slit 22s, the separation width between the plate-like members is 10 times or less than the cutting depth of the slit-forming recess 22c of the air slit 22s, and the thickness of the plate-like member is about 2 mm or Less than that. Further, the length of the air slit 22s of the plate-like member in the gas flow direction is 3 to 5 times the larger of the slit forming recess 22c cutting depth of the air slit 22s or the distance between the adjacent partition walls 22k. As a degree, the plurality of partition walls 22k are formed in a state in which they are arranged apart from each other in the tube axis direction. This is because if the length of the partition wall 22k in the tube circumferential direction is short, it is not sufficient to regulate the flow direction, and conversely if it is long, the pressure loss increases. Further, as shown in FIG. 5 (b), both end portions of the partition wall 22k in the longitudinal direction are formed with curved corners in a cross-sectional view, and are on the inner side of the peripheral wall (downstream side in the gas flow direction). The part is in a state of being retreated to the upstream side in the gas flow direction. The distance from the combustion chamber N as the original slit-shaped flow path without the partition wall 22k (that is, the retraction distance to the upstream side in the gas flow direction described above) varies depending on the thickness of the partition wall 22k, but the flow divided by the partition wall 22k. Is a distance until the two flow again to obtain a substantially uniform flow velocity, and specifically, about several times the thickness of the partition wall 22k.

  Further, since the structure is the same as that of the air slit forming member 22, the illustration is omitted, but when forming the partition wall in the gas slit forming member 32, the separation width between the plate-like members is set to the slit forming recess cutting depth of the gas slit 32 s. The thickness of the plate member is about 2 mm or less. Furthermore, the length of the gas flow direction in the gas slit 32s of the plate-like member is set to about 3 to 5 times the larger one of the slit forming recess cutting depth of the gas slit 32s or the distance between adjacent partition walls, A plurality of partition walls are formed in a state of being arranged side by side in the tube axis direction. This is because if the length of the partition wall in the pipe circumferential direction is short, it is not sufficient to regulate the flow direction, and conversely if it is long, the pressure loss increases. Further, both end portions in the longitudinal direction of the partition wall are formed in a curved shape in a sectional view, and the end portion on the inner side of the peripheral wall (downstream side in the gas flow direction) is on the upstream side in the gas flow direction. Retired. Although the distance from the combustion chamber N as the original slit-shaped flow path without the partition wall (that is, the retraction distance to the upstream side in the gas flow direction described above) varies depending on the thickness of the partition wall, the flow divided by the partition wall joins again. The distance until the flow rate becomes substantially uniform, specifically, about several times the thickness of the partition wall.

That is, the flow path adjacent to the opening where the air slit 22s opens toward the combustion chamber N includes a subdivided portion that is subdivided into a plurality of portions in the tube axis direction by the partition 22k, and the partition of the subdivided portion 22k is constituted by a thin plate-like member arranged in a plurality perpendicular to the longitudinal direction of the air slit 22s.
As a result, the air slits 22s are formed in the circumferential direction of the pipe and become an assembly of narrow pipe lines aligned in the pipe axis direction, so that the air passing through them is prevented from flowing in directions other than the mainstream, As a result, the flow velocity fluctuation in the longitudinal direction (tube axis direction) of the air slit 22s is suppressed. As a result, in premixed combustion, turbulent fluctuations in the mixture flow are suppressed, and in diffusive combustion, turbulent fluctuations in the flow of fuel gas and air and resulting fluctuations in fuel concentration are suppressed. As an effect, combustion instability and combustion noise are suppressed.

When a plate-like member is provided as a partition wall, the end on the inner side of the peripheral wall of the plate-like member is upstream of the gas flow direction by a predetermined distance from the position where the air slit 22s opens toward the combustion chamber. The portion in contact with the inner wall of the combustion chamber N keeps the original slit shape as a continuous opening and subdivides the flow only in the upstream portion thereof, that is, the opening portion of the air slit 22s, and its The portion immediately upstream in the gas flow direction of the opening portion is formed as a single slit by making the partition wall 22k retreat to the upstream side in the gas flow direction of the air slit 22s, so that there is no continuous subdivision. It is a slit part.
Further, when the partition wall that subdivides the slit reaches the peripheral wall surface of the combustion chamber N, a portion where fuel, air, or an air-fuel mixture does not flow is generated by the partition wall. As a result, the negative effect of overheating the combustion chamber wall is caused by the flame adhering to the partition wall when the tubular flame has a part with uneven speed and concentration, or when the blowout flow rate is slow and the partition wall is thick. The end of the thin plate-like member on the peripheral wall side of the combustion chamber N is reduced by retreating a predetermined distance from the position where the air slit 22s opens toward the combustion chamber N to the upstream side in the gas flow direction. It will be possible.

Further, both end portions of the partition wall 22k on the outer peripheral wall outer side and the peripheral wall inner side in the subdivided portion are configured to have curved corners in a sectional view.
That is, if the partition wall 22k constituting the subdivided portion in the air slit 22s has a large thickness, generation of noise and an increase in pressure loss occur acoustically due to vortices (Karman vortices) generated downstream of the members of the partition wall 22k. there is a possibility. Therefore, by forming both end portions of the partition wall 22k on the outer peripheral wall side and the peripheral wall inner side in the subdivided portions so that the corner portions are curved in a cross-sectional view, generation of Karman vortices can be suppressed and noise and The pressure loss can be reduced. Furthermore, it is ideal if the shape of the subdividing member in contact with the flow of fuel, air, or air-fuel mixture can be streamlined. Thereby, the bad influence at the time of providing the partition 22k can further be eliminated, and it can contribute to stabilization of combustion and reduction of combustion noise.
Further, the partition wall of the gas slit 32s has the same effect as that of the partition wall 22k of the air slit 22s.

[Second Embodiment]
Hereinafter, the characteristic structure of the tubular flame burner which concerns on 2nd Embodiment of this invention is demonstrated. In the second embodiment, the method for forming the partition wall is changed with respect to the first embodiment. Therefore, the same reference numerals are given to common configurations, and detailed description thereof is omitted.
In the second embodiment, as shown in FIGS. 6A and 6B, the air slit forming member 22 as a slit forming member for forming the cylindrical combustion chamber N is cut by the air slit 22s. The partition wall 22k is formed by leaving a part of the slit forming concave portion 22c to be cut away while being formed by the cut opening portion (slit forming concave portion 22c). In addition, the width of the cut portion of the slit forming recess 22c is set to about 10 times or less of the slit forming recess cutting depth of the air slit 22s, and the distance between adjacent cutting portions is set to about 2 mm or less. The flow paths are formed in a direction substantially perpendicular to the tube axis direction, that is, in the tube circumferential direction (tangential direction), and a plurality of partition walls 22k are formed in a state of being arranged in parallel with being separated in the tube axis direction. Further, as shown in FIG. 6 (c), both end portions of the partition wall 22k on the outer side of the peripheral wall and the inner side of the peripheral wall are formed with curved corners in the cross-sectional view, and on the inner side of the peripheral wall (gas The end of the downstream side in the flow direction is in a state of being retreated to the upstream side in the gas flow direction.

  Although not shown because it is the same as FIG. 5, the gas slit 32 s is a cutting opening (slit) obtained by cutting the gas slit forming member 32 as a slit forming member that forms the cylindrical combustion chamber N. The partition wall is formed by cutting and leaving a part of the slit forming recess of the gas slit 32s. In other words, the width of the cut portion of the slit forming recess of the gas slit 32s is about 10 times or less than the slit forming recess cutting depth of the gas slit 32s, and the distance between adjacent cutting portions is about 2 mm or The flow path is formed in a direction substantially perpendicular to the tube axis direction, that is, in the tube circumferential direction, and a plurality of partition walls are separated from each other in the tube axis direction. Further, both end portions on the outer peripheral wall outer side and the inner peripheral wall inner side of the partition wall are formed with curved corners in the sectional view similarly to FIG. 6C, and the peripheral wall inner side (gas flow The end of the direction downstream side is in a state of being retreated to the upstream side in the gas flow direction.

  In this embodiment, as in the first embodiment, the cutting depth of the slit forming recess 22c of the air slit forming member 22 is 1 / (1) of the interval between adjacent cutting portions, that is, the interval between adjacent partition walls 22k. The cutting depth of the slit forming concave portion of the gas slit forming member 32 is about one third of the distance between adjacent slits in the slit forming concave portion of the gas slit forming member 32, that is, the interval between adjacent partition walls. It is said.

That is, the flow path adjacent to the opening where the air slit 22s opens toward the combustion chamber N includes a subdivided portion that is subdivided into a plurality of portions in the tube axis direction by the partition wall 22k, and the slit is cylindrical. It is formed by a cutting opening obtained by cutting a part of a slit forming member 22 for air as a combustion chamber constituting member constituting the combustion chamber N, and a partition 22k of a slit subdivided portion covers a part of the cutting opening. It is configured by leaving it cut.
And thereby, the combustion chamber constituting member constituting the combustion chamber N of the tubular flame burner 1 is formed of a thick material, or a member in which a flow path of fuel, air, or an air-fuel mixture is integrated. In this case, when the air slit 22s is opened, a long hole is not provided in the tube axis direction and a thin plate member is juxtaposed in the long hole as in the first embodiment. A small hole communicating from the inner side of the peripheral wall to the outer side of the peripheral wall forming part 22a of the slit forming member 22 is arranged side by side in the longitudinal direction of the slit 22s for air, so that it is subdivided across the partition wall 22k made of a thin plate member. The introduction path can be almost the same as the slit formed.

Also in the partition wall 22k in the second embodiment, as in the first embodiment, the opening of the air slit 22s and the portion immediately upstream in the gas flow direction in the opening serve as the partition 22k for air. By setting the slit 22s to retreat to the upstream side in the gas flow direction, a continuous slit portion without subdividing portions is formed. Further, when the thickness of the partition wall 22k left after cutting is relatively thick, the upstream end and the downstream end in the gas flow direction are rounded (rounded) to reduce the flow resistance. Configure. If the cross section itself of the partition wall 22k is left to be streamlined, the pressure loss can be further reduced. In other words, the corner portions of the both ends of the partition wall 22k on the outer side and the inner side of the partition wall 22k are formed in a curved shape in a cross-sectional view.
Since the effect by these structures is the same as that of 1st Embodiment, it abbreviate | omits.

That is, according to the second embodiment, the instability of combustion and combustion noise can be suppressed as in the first embodiment, and no additional members are required, and the machining method is The partition 22k can be formed economically only by the change.
Further, the partition wall of the gas slit 32s in this embodiment has the same function and effect as the partition wall 22k of the air slit 22s.

[Another embodiment]
Next, another embodiment of the tubular flame burner of the present invention will be described.
(A) In the first and second embodiments described above, a partition is formed in both the air slit 22 s for ejecting air and the gas slit 32 s for ejecting air-fuel mixture to form subdivided portions. It is not limited to such a configuration, and a partition may be provided only on the air side, that is, the air slit 22s. Thereby, the flow of air can be subdivided.

(B) In the first and second embodiments, the both ends of the partition wall 22k of the air slit 22s (or the partition wall of the gas slit 32s) on the outer side of the peripheral wall and the inner side of the peripheral wall have corner portions in the cross-sectional view. Although it is configured to be curved, the corner portion is not curved on the outer side of the peripheral wall 22k of the air slit 22s (or the partition of the gas slit 32s), that is, on the upstream side in the gas flow direction. It is good also as a state. At this time, it is also possible to make the edge part of the upstream of a gas flow direction into a thin blade shape.

(C) In the first and second embodiments described above, the configuration of the one-end closed tubular flame burner has been described. However, the air slit 22s is subdivided by the partition wall 22k, or the gas slit 32s is narrowed by the partition wall. The structure of the present invention of dividing can also be used for a general tubular flame burner having both ends open.

(D) In the first or second embodiment, air is introduced from the air slit 22s and the mixture of fuel gas and air is introduced into the combustion chamber N eccentrically from the gas slit 32s to cause swirl combustion. However, the present invention is not limited to such a configuration. For example, only the air-fuel mixture may be eccentrically introduced into the combustion chamber N and swirled and burned.
Further, the present invention is not limited to the above-described configuration, and air, fuel gas, and a mixture thereof may be separately introduced into the combustion chamber N and swirled and burned.
That is, fuel gas and air, a mixture of fuel gas and air, or a fuel gas from a slit opened in the tube axis direction on the side surface of the cylindrical combustion chamber toward the tangential direction of the combustion chamber Then, any one of air, fuel gas, and air mixture is jetted oppositely and swirled and burned.

  INDUSTRIAL APPLICABILITY The present invention can be used to stabilize and improve the performance of tubular flame burners from industrial use to business use and household use by eliminating the instability of combustion in a tubular flame burner closed at one end. At the same time, combustion noise (noise) can be reduced, so that it is particularly useful for application to combustion equipment for small-scale business and home use.

22 air slit forming member 22h through hole 22c slit forming recess 22a peripheral wall forming portion 22b linear portion 22m support member 22k partition wall

Claims (4)

From a slit opened along the tube axis direction on the side surface of the cylindrical combustion chamber, the fuel gas and air, the mixture of the fuel gas and air, the air and the fuel gas are directed toward the tangential direction of the combustion chamber. A flame flame burner that swirls and burns a mixture of air and air , or a mixture of fuel gas and air and fuel gas and air facing each other,
The flow path close to the opening where the slit opens toward the combustion chamber includes a subdivided portion that is subdivided into a plurality in the tube axis direction by a partition wall ,
The tubular flame burner in which the opening portion of the slit and the immediately upstream portion in the gas flow direction in the opening portion are continuous slit portions formed of a single slit .   The tubular flame burner according to claim 1, wherein the partition wall of the subdivided portion is constituted by a thin plate-like member arranged in a plurality perpendicular to the longitudinal direction of the slit.   The slit is formed by a cutting opening formed by cutting a part of a combustion chamber constituting member constituting the cylindrical combustion chamber, and the partition of the subdivided portion of the slit forms a part of the cutting opening. 2. The tubular flame burner according to claim 1, wherein the tubular flame burner is left uncut. The tubular flame burner according to any one of claims 1 to 3, wherein both end portions of the partition wall in the subdivided portion are formed with curved corners in a cross-sectional view .

Images