JP2021042880A - Vaporization type combustion device - Google Patents

Abstract

To provide a vaporization type combustion device which prevents deformation of a burner head-fixing member due to influence of combustion heat.SOLUTION: A vaporization type combustion device includes: a vaporizer including a heating heater and having an outlet for a mixed gas on a bottom thereof; a mixing chamber that is communicated with the outlet under the vaporizer; a burner head positioned in a back side of the vaporizer above the mixing chamber; and a burner head-fixing member 29 for fixing the burner head. On the burner head, burner port parts 23 in which a plurality of burner ports 25 are arranged in a longitudinal direction thereof, and secondary air supply parts 24 in which a plurality of secondary air holes 27 are arranged in a longitudinal direction thereof, are arranged alternately. A non-burner port part not having the burner port 25 is formed on a tip end of the burner port part 23. A cooling air port 30 is provided in the burner head-fixing member 29 arranged on the tip end of the burner head on a side where the non-burner port part is formed, the cooling air port supplying air for cooling the burner head-fixing member 29 to the secondary air supply part 24 positioned below the burner head-fixing member 29.SELECTED DRAWING: Figure 6

Description

The present invention relates to a vaporization type combustion device used in a water heater, a heater, or the like.

Conventionally, in this type of gas, a vaporizer equipped with a heating heater is used to generate a premixed gas of the vaporized gas and combustion air, and after further promoting the mixing in the mixing chamber, a burner head is used to generate secondary air. There was something that allowed good combustion while receiving supply. (See, for example, Patent Document 1.)

Japanese Unexamined Patent Publication No. 2006-71111

By the way, in this conventional one, the tip side of the burner head is fixed by the burner head fixing member, and even if the tip side of the burner head is deformed by the heat of combustion and tries to rise from the mixing chamber. , The burner head fixing member suppresses the lifting.

However, the burner head fixing member is in a state of being affected by combustion heat at the time of combustion like the burner head, and the burner head fixing member itself may be deformed. In that case, there is a risk that deformation due to combustion heat on the tip side of the burner head cannot be suppressed.

In order to solve the above problems, in the first aspect of the present invention, a vaporizer having a heating heater and an outlet for a mixed gas at the bottom is mixed with the outlet at the lower part of the vaporizer. A chamber, a burner head located on the back side of the vaporizer at the upper part of the mixing chamber, and a burner head fixing member for fixing the burner head are provided, and the burner head has a plurality of flame holes in the longitudinal direction. The flame holes arranged in a row along the flame holes and the secondary air supply parts in which a plurality of secondary air holes are arranged in a row along the longitudinal direction are alternately arranged, and the flame holes are arranged on the tip side thereof. In the vaporization type combustion device in which the flameless hole portion without the flame hole is formed and the burner head fixing member is arranged on the side where the flameless hole portion is formed and on the tip end side of the burner head. The secondary air supply unit located below the burner head fixing member is provided with a cooling air hole for supplying air for cooling the burner head fixing member.

Further, in claim 2, the burner head fixing member has a U-shaped portion having a substantially U-shaped cross section and the burner that engage with each other so as to surround the tip end side of the burner head and the tip end side of the mixing chamber. It has a rising portion that rises upward from the tip of the U-shaped portion located on the upper side of the head, and is between the flame hole located on the most tip side of the flame hole portion and the rising portion. A rectifying air hole for supplying air along the rising portion is arranged in the secondary air supply portion adjacent to the region of the above.

According to claim 1 of the present invention, cooling air is provided by providing a cooling air hole for supplying air for cooling the burner head fixing member in the secondary air supply portion located below the burner head fixing member. Since the cooling air blown out from the hole hits the burner head fixing member, the burner head fixing member is cooled, so that overheating of the burner head fixing member can be suppressed and deformation of the burner head fixing member can be prevented.

Further, according to claim 2, the secondary air supply portion adjacent to the region from the flame hole located on the most tip side of the flame hole portion to the rising portion of the burner head fixing member is along the rising portion. By arranging the rectifying air holes for supplying air, the air blown out from the rectifying air holes is supplied along the rising portion, so that the burner head fixing member is cooled by hitting the rising portion, so that the burner head Overheating of the fixing member is suppressed, deformation of the burner head fixing member can be prevented, and further, the air blown out from the rectifying air hole and supplied along the rising portion is blown out from the cooling air hole to burner. Since the cooling air that hits the head fixing member and is deflected in the direction of the flame hole can be guided in the vertical direction, the lift of the flame generated in the flame hole near the burner head fixing member can be suppressed.

Sectional drawing of the vaporization type combustion apparatus of one Embodiment of this invention. Front view of the vaporizer. (A) The figure in the state where the mixing chamber, the burner head, and the burner head fixing member are assembled. (B) The figure in the state where the burner head fixing member was removed from the state of (a). A plan view of the state in which the mixing chamber, the burner head, and the burner head fixing member are assembled. Sectional view of mixing chamber and burner head. FIG. 3 is a cross-sectional view of a main part of the burner head tip side in the vaporization type combustion device according to the embodiment of the present invention and the vaporization type combustion device of the comparative example.

Next, the configuration of the vaporization type combustion apparatus according to the embodiment of the present invention will be described in detail with reference to the drawings.

Reference numeral 1 denotes a horizontal bowl-shaped vaporizer made of die-cast aluminum. The front surface is closed by a lid 4 provided with a fuel injection nozzle 2 and a primary air ejection port 3, and the bottom is divided into two by a partition wall 5. The outlet 6 of the mixed gas is formed.

The vaporizer 1 forms an inner surface facing the fuel injection nozzle 2 perpendicular to the fuel injection nozzle 2 to form a vertical vaporization surface 7, and a portion where fuel (fuel oil or the like) is sprayed is a uniform diffusion of fuel. A flat surface 8 is formed, and a plurality of beads 9 having different lengths are arranged in a plurality of stages in the horizontal direction and in parallel with each other around the flat surface 8 to form a meandering path 10 of the fuel flowing down. doing.

Further, since the flat surface 8 and the meandering path 10 are formed with one injection hole on each of the left and right sides of the fuel injection nozzle 2, one injection hole is provided on each of the left and right sides on the vertical vaporization surface 7 facing the flat surface 8 and the meandering path 10. ing.

Reference numeral 11 denotes a heating heater composed of a U-shaped sheathed heater cast in the vaporizer 1, which protrudes from above the vertical vaporization surface 7 toward the fuel injection nozzle 2 and covers the space above the vertical vaporization surface 7. , It is cast in the lower side wall 13 which slightly protrudes from the lower side of the vertical vaporization surface 7 and forms the outflow port 6.

Reference numeral 14 denotes a trapezoidal guide wall provided at the final end of the meandering path 10 of the vaporizer 1 as viewed from a plane, and a mixed gas of the vaporized gas formed in the vaporizer 1 and the primary air for combustion is collected at the bottom. The guide is smoothly divided into two outlets 6.

Reference numeral 15 denotes a rectifying chamber 16 made of aluminum die-cast provided in the lower part of the vaporizer 1, which is recessed one step downward so as to rectify the mixed gas through the outlet 6, and a rectifying chamber 16 having a large capacity. It is configured by integrally molding a plurality of gas chambers 18 having secondary air chambers 17 alternately communicating downward with the chamber 16 which is partitioned so as to have a tapered shape as the distance from the vaporizer 1 communicates with the chamber 16. Further, an auxiliary heater 19 composed of a U-shaped sheathed heater is cast in the bottom of the rectifying chamber 16.

Further, by applying a heat-resistant paint to the inner surface of the mixing chamber 15 to form a coated surface 20 having fine irregularities, the ejection speed of the mixed gas is made uniform as a flow resistance of the mixed gas, and rectification is promoted. ..

Reference numeral 21 denotes a straightening vane provided by hanging from above at each gas chamber 18 inlet, which is configured by alternately forming notches and bent pieces on a single plate, and covers about 1/6 of the gas chamber 18 inlet area. By blocking from above, the wind force sent to the gas chamber 18 is suppressed so that a uniform flame is formed as a whole.

Reference numeral 22 denotes a burner head formed on the back side of the vaporizer 1 at the upper part of the gas chamber 18 and the secondary air chamber 17 of the mixing chamber 15, and is adjacent to the convex flame hole portion 23 fixed on the gas chamber 18. It is composed of a secondary air supply unit 24 which is formed by a recess between the flame hole portions 23 and communicates with the secondary air chamber 17.

A plurality of flame holes 25 are arranged in a row along the longitudinal direction in the flame hole portion 23, and the flame hole 25 is an elongated inverted L shape extending from substantially the center of the top of the flame hole portion 23 to the side wall. It has a shape and is formed alternately on the left and right along the longitudinal direction. Further, the flame hole portion 23 is flameless without a flame hole 25 on the tip end side when the vaporizer 1 side is the base end and the side opposite to the vaporizer 1 (the side away from the vaporizer 1) is the tip end. The hole 26 is formed.

A plurality of secondary air holes 27 are arranged in a row along the longitudinal direction at the bottom of the secondary air supply unit 24, and communicate with the secondary air chamber 17 to supply secondary air. The secondary air supply unit 24 has the same arrangement as the secondary air hole 27, that is, the proximal end side closer to the vaporizer 1 than the secondary air hole 27 and the distal end side farthest from the vaporizer 1, that is, the secondary. Screw holes 28 through which screws are inserted to fix the burner head 22 to the mixing chamber 15 are formed at both ends of the air supply unit 24, and further, the secondary air supply unit 24 is arranged in the same arrangement as the secondary air holes 27. A cooling air hole 30 for supplying air for cooling the burner head fixing member 29 is provided at a position below the burner head fixing member 29, which will be described later. The cooling air hole 30 communicates with the secondary air chamber 17 like the secondary air hole 27, and the air blown out from the cooling air hole 30 to cool the burner head fixing member 29 is the secondary air. Secondary air supplied from chamber 17 is used. Further, the secondary air supply unit 24 is provided with a rectifying air hole 31 in the same arrangement as the secondary air hole 27 so as to be closer to the vaporizer 1 from the cooling air hole 30 and adjacent to the cooling air hole 30. Has been done. The rectifying air hole 31 communicates with the secondary air chamber 17 like the secondary air hole 27, and as the air blown out from the rectifying air hole 31, the secondary air supplied from the secondary air chamber 17 is used. used. In FIG. 4, the circle drawn by a broken line on the burner head fixing member 29 indicates the cooling air hole 30, and the position of the cooling air hole 30 that can be seen when the burner head fixing member 29 is transmitted through the burner head fixing member 29. Is shown.

The burner head fixing member 29 described above is the side on which the flameless hole portion 26 is formed, and is arranged on the tip end side (the side away from the vaporizer 1) of the burner head 22. From the U-shaped portion 32 having a substantially U-shaped cross section that engages so as to surround the tip side and the tip side of the mixing chamber 15 and the tip portion of the U-shaped portion 32 located above the burner head 22. It has a rising portion 33 that rises upward. The portion of the U-shaped portion 32 located on the upper side of the burner head 22 is flameless at that height position via a slight distance in the height direction from the surface of the burner head 22 (flame hole portion 23). It extends in the longitudinal direction (the same direction as the longitudinal direction of the burner head 22) so as to cover most of the secondary air supply portion 24 adjacent to the hole portion 26 and the flameless hole portion 26. The burner head fixing member 29 may be fixed by being fastened together with the burner head 22 and the mixing chamber 15 with screws, or the burner head fixing member 29 alone is fixed to the mixing chamber 15 with screws. It may be a thing.

Further, the rectifying air hole 31 is in the length direction between the flame hole 25 located at the most tip side (the side away from the vaporizer 1) of the flame hole portion 23 and the rising portion 33 of the burner head fixing member 29. It is provided in the secondary air supply unit 24 adjacent to the formed region, and the rectifying air hole 31 supplies air along the rising portion 33 of the burner head fixing member 29. Here, the rectifying air hole 31 is located in the secondary air supply unit 24 adjacent to the region formed in the length direction between the burner head fixing member 29 and the rising portion 33 of the rectifying air hole 31. The whole is positioned in the secondary air supply unit 24 adjacent to the region formed in the length direction between the rising portion 33 of the burner head fixing member 29, and most of the rectifying air holes 31 are fixed to the burner head. It is located in the secondary air supply unit 24 adjacent to the region formed in the length direction between the member 29 and the rising portion 33, and the remaining part of the rectifying air hole 31 overlaps the rising portion 33 in a plan view. It also includes those that are positioned so that they can be seen.

Reference numeral 34 denotes a flame holding guide fixed to both sides of the flame hole 23, and the upper portion facing the flame hole 25 is bent diagonally upward on the opposite side of the flame hole 25 to spread the flame formed in the flame hole 25. And guide the secondary air supplied from the lower secondary air hole 27.

Reference numeral 35 denotes a heat-resistant rectifying mesh provided in the flame hole portion 23, which is formed by knitting a wire rod having a wire diameter of 0.29 mm into 36 meshes, and performs the final rectification of the mixed gas ejected from the flame hole 25.

Reference numeral 36 denotes a vertically long endothermic fin protruding from the back surface of the vaporizer 1 onto the burner head 22, which is divided into a plurality of fins in order to increase the contact area with the combustion gas and increase the amount of heat back. The back is used as heat of vaporization to save power in the heating heater 11, and the upper end is an inclined portion 37 that is inclined downward toward the burner head 22 side to improve the escape of rising combustion heat. There is.

Reference numeral 38 denotes an L-shaped restraining plate provided above the endothermic fin 36, which projects from the vaporizer 1 side to about two-thirds above the endothermic fin 36 to cover the endothermic fin 36, and the combustion heat rising between them is covered. It suppresses the ascending force. When the restraining plate 38 is projected until it covers the entire upper part of the heat absorbing fin 36, a slit or a hole may be formed in the restraining plate 38 itself to adjust the restraining force.

Reference numeral 39 denotes an uneven surface in which a plurality of laterally R-shaped convex portions are continuously formed on the back wall of the vaporizer 1 between the endothermic fins 36. It is designed to obtain a back, and since it has an R shape in particular, it is possible to smoothly suppress only the ascending force without causing turbulence in the heat of combustion.

Reference numeral 40 denotes an upwardly open combustion chamber that exposes the back surface of the vaporizer 1 and surrounds the upper part of the burner head 22, and the outer periphery thereof is covered with a cover frame 41 at predetermined intervals.

Reference numeral 42 denotes a combustion fan whose rotation speed is controlled according to the amount of combustion, which communicates with the space between the combustion chamber 40 and the cover frame 41 and the ejection port 3 via the air passage 43, and burns at the ejection port 3. The primary air for use is supplied, and the space between the combustion chamber 40 and the cover frame 41 passes through the side of the vaporizer 1 and from below the mixing chamber 15 via the secondary air chamber 17 to the secondary air supply unit of the burner head 22. The secondary air supplied to 24 and the air for cooling the combustion chamber 40 are supplied.

Reference numeral 44 denotes an electromagnetic pump that pumps fuel to the fuel injection nozzle 2 via an oil supply pipe 45. The fuel supply amount is changed according to the load in conjunction with the combustion fan 42, and the burner head 22 is used for large to small thermal combustion. It controls the amount of combustion of. Reference numeral 46 denotes a heat shield plate.

Next, the operation of the first embodiment of the present invention will be described.
When the heating heater 11 is energized and the vaporizer 1 is heated to a predetermined temperature, this is detected by a temperature sensor (not shown) provided at an appropriate position, and the combustion fan 42 and the electromagnetic pump 44 are driven to drive the vaporizer. Fuel is supplied from the fuel injection nozzle 2 to 1, and primary air for combustion is supplied from the injection port 3.

Then, in the vaporizer 1, the fuel injected from the fuel injection nozzle 2 collides with the vertical vaporization surface 7 and the flat surface 8 and diffuses uniformly to the surroundings because there is no unevenness. The primary air supplied by the bead 9 moves sequentially along the meandering path 10 due to the wind force of the primary air supplied to the gas, and the vaporization time is sufficient to promote the vaporization. Mixing with the raised vaporized gas is sufficiently performed, and a good mixed gas can be obtained.

Therefore, a lightweight and compact vaporizer 1 can be obtained by the vertical vaporization surface 7, a compact and powerful combustion device can be obtained, and a sufficient mixed gas can always be formed without lowering the vaporization capacity.

Further, the vaporized gas vaporized on the vertical vaporization surface 7 collides with the vertical vaporization surface 7 and is repelled together with the primary air, and the upper side wall 12 and the lower side wall provided with the heating heater 11 in the horizontal bowl-shaped vaporizer 1. Although it flows to the 13 side, since the upper side wall 12 and the lower side wall 13 are sufficiently heated by the heating heater 11, the vaporization of the vaporized gas is further promoted, the primary air is also satisfactorily heated, and the vaporizer 1 Is in the shape of a horizontal bowl, and the vaporized gas and the primary air do not flow out immediately, but stay in the vaporizer 1 to some extent and mix well, and then flow out from the outlet 6.

On the other hand, the mixed gas flowing out from the outlet 6 flows into the mixing chamber 15, but the mixing chamber 15 is heated for a certain period of time by the auxiliary heater 19 which is energized at the same time as the preheating of the vaporizer 1, and the high temperature preheating state is maintained. Therefore, the inflowing mixed gas does not liquefy.

Then, after promoting the rectification in the rectifying chamber 16, the mixed gas is immediately divided into a plurality of gas chambers 18 and flows into the gas chamber 18, and the flame hole portion 23 is formed by the fine unevenness and the tapered shape due to the painted surface 20 on the inner wall surface. The ejection speed of the mixed gas ejected from the flame hole 25 is uniform as a whole regardless of the longitudinal direction, and the mixed gas passes through the rectifying chamber 35 immediately before being ejected from the flame hole 25 and is finally rectified and ejected. Combustion starts when ignited by an ignition means (not shown) as appropriate.

Further, since the flame holes 25 in which the flame is formed are provided alternately on the left and right at the top of the flame hole portion 23, the remaining portion is sufficiently secured, the strength is strong, and there is no concern that the flame will be burnt even in long-term combustion. Even if the flame becomes large due to large-scale combustion, the formed flames alternate on the left and right, and a good combustion flame can be obtained without interfering with each other.

Further, a secondary air supply unit 24 is formed between the flame hole portions 23, and a flame hole 25 is extended to the side wall surface of the flame hole portion 23, and the flame holding guide 34 guides the flame hole portion 25. The spread of the flame formed in each flame hole 25 is suppressed by the flame holding guide 34, and the flame is also guided at the bent portion. Secondary air is supplied smoothly and reliably, and good combustion is performed.

During the above combustion, the combustion gas rises between the endothermic fins 36, so that the vaporizer 1 can obtain a sufficient amount of heat back through the endothermic fins 36, and the heating heater 11 is energized after the start of combustion. The heat of vaporization can be obtained by heat back, and power saving can be surely measured.

If a heat exchanger (not shown) for hot water supply or heating in which a fluid to be heated (liquid such as water) flows inside is installed above the combustion chamber 40, the combustion noise is small and the response is high. Good good hot water supply or heating can be done.

Here, regarding the state at the time of combustion in the vaporization type combustion device of the present embodiment (first embodiment and the second embodiment) and the vaporization type combustion device of the comparative example, the main part on the tip side of the burner head 22 shown in FIG. This will be described with reference to a sectional view.
First, the comparative example shows a conventional vaporization type combustion device, but in the conventional one, the burner head fixing member 29 (more detailed) is attached to the secondary air supply unit 24 located below the burner head fixing member 29. Is not provided with a cooling air hole 30 for supplying air for cooling the U-shaped portion 32) located above the burner head 22 in the burner head fixing member 29. Then, the burner head fixing member 29 is in a state of being affected by the combustion heat at the time of combustion like the burner head 22, and as a result of continuing to be affected by the combustion heat, the burner head is fixed as shown by the broken line. The member 29 (U-shaped portion 32 and rising portion 33 located above the burner head 22) may be deformed so as to open in a direction away from the burner head 22, and combustion on the tip side of the burner head 22 may occur. Deformation due to heat may not be suppressed by the burner head fixing member 29.

Therefore, in the first embodiment, the secondary air supply unit 24 located below the burner head fixing member 29 is provided with the burner head fixing member 29 (more specifically, above the burner head 22 among the burner head fixing members 29). By providing the cooling air hole 30 for supplying the air for cooling the U-shaped portion 32) located in the first embodiment, as shown by the solid line arrow in the first embodiment, the cooling air hole When the cooling air (secondary air) blown out from the 30 hits the burner head fixing member 29, the burner head fixing member 29 is cooled, so that overheating of the burner head fixing member 29 is suppressed and the burner head fixing member 29 is suppressed. The deformation of 29 can be prevented.

Here, in FIG. 6, although the cooling air hole 30 is provided in the first embodiment, the cooling air (secondary air) blown out from the cooling air hole 30 is the first embodiment. As shown by the broken line arrow inside, the flame that hits the U-shaped portion 32 located above the burner head 22 of the burner head fixing member 29 and is deflected toward the flame hole 25 and is close to the burner head fixing member 29. There is a risk of lifting the flame generated in the hole 25. When the flame is lifted, problems such as misfire and odor generation due to misfire may occur.

Therefore, in the second embodiment, the region adjacent to the region from the flame hole 25 (in other words, the flame hole 25 closest to the non-flame hole portion 26) located on the tip end side of the flame hole portion 23 to the rising portion 33 is adjacent. By arranging the rectifying air hole 31 for supplying air (secondary air) along the rising portion 33 in the secondary air supply portion 24, as shown by an arrow line in the present embodiment of FIG. The air blown out from the rectifying air hole 31 and supplied along the rising portion 33 blows out the cooling air from the cooling air hole 30 and hits the burner head fixing member 29 to deflect the cooling air in the direction of the flame hole 25. Since it can be guided in the vertical direction, it is possible to suppress the lift of the flame generated in the flame hole 25 near the burner head fixing member 29. Further, since the air blown out from the rectifying air hole 31 is supplied along the rising portion 33, the burner head fixing member 29 is cooled by hitting the rising portion 33, so that overheating of the burner head fixing member 29 is suppressed. Therefore, it is possible to prevent the burner head fixing member 29 from being deformed.

When the burner head fixing member 29 is assembled to the burner head 22 and the mixing chamber 15 in a plan view as shown in FIG. 4, the rectifying air hole 31 has a rising portion in the entire region of the rectifying air hole 31. It may be arranged in the secondary air supply unit 24 so that it can be seen without overlapping with 33, and the secondary air supply unit 24 can be arranged so that a part of the area of the rectifying air hole 31 can be seen overlapping with the rising portion 33. It may be arranged in. When a part of the rectifying air hole 31 is arranged in the secondary air supply unit 24 so as to overlap with the rising portion 33, the air supplied from the rectifying air hole 31 surely hits the rising portion 33. Therefore, the burner head fixing member 29 can be cooled more effectively.

It should be noted that the present invention is not limited to one embodiment, and is implemented with various modifications within a range that does not deviate from the gist thereof.

1 Vaporizer 6 Outlet 11 Heating heater 15 Mixing chamber 22 Burner head 23 Flame hole 24 Secondary air supply 25 Flame hole 26 Flameless hole 27 Secondary air hole 29 Burner head fixing member 30 Cooling air hole 31 Rectifying air hole 32 U-shaped part 33 Rising part

Claims (2)

A vaporizer having a heating heater and a mixed gas outlet at the bottom, a mixing chamber communicating with the outlet at the lower part of the vaporizer, and a mixing chamber located at the upper part of the mixing chamber on the back side of the vaporizer. A burner head and a burner head fixing member for fixing the burner head are provided.
In the burner head, a flame hole portion in which a plurality of flame holes are arranged in a row along the longitudinal direction and a secondary air supply portion in which a plurality of secondary air holes are arranged in a row along the longitudinal direction alternate. In the flame hole portion, a flameless hole portion without the flame hole is formed on the tip side thereof.
The burner head fixing member is a vaporization type combustion device arranged on the side where the flameless hole portion is formed and on the tip end side of the burner head.
A vaporization type combustion apparatus characterized in that a cooling air hole for supplying air for cooling the burner head fixing member is provided in the secondary air supply unit located below the burner head fixing member. The burner head fixing member is located above the burner head and a U-shaped portion having a substantially U-shaped cross section that engages so as to surround the tip end side of the burner head and the tip end side of the mixing chamber. The two having a rising portion that rises upward from the tip portion of the U-shaped portion, and adjacent to a region between the flame hole located on the most tip side of the flame hole portion and the rising portion. The vaporization type combustion apparatus according to claim 1, wherein a rectifying air hole for supplying air is arranged in the next air supply unit along the rising portion.

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