JP2005351542A - Combustion device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion device capable of securing the sufficient quantity of air to be mixed with a fuel gas immediately after vaporization, even when an air blower is miniaturized. <P>SOLUTION: This combustion device for burning a fuel-air mixture prepared by mixing the fuel gas and the air, comprises a bottomed cylindrical vaporizing part for vaporizing a gas fuel and producing the fuel gas, an air supply mechanism for supplying the air to the vaporizing part is mounted on a radial inner part of the vaporizing part, and the air supply mechanism is composed of a rotating member comprising a plurality of blades. The air supply mechanism is constituted to allow the air to flow from an inner part of the rotating member to an outer edge side along the blades when the rotating member is rotated, and the fuel gas and the air are mixed between the vaporizing part and the air supply mechanism. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a combustion apparatus provided in a heater such as a water heater or a fan heater, or a hot water heater. More specifically, the present invention relates to a fuel gas generated by vaporizing liquid fuel. The present invention relates to a combustion apparatus that burns an air-fuel mixture in which air and air are mixed.

  Even now that city gas and propane gas have become widespread, in order to reduce running costs, combustion devices that use inexpensive liquid fuel such as kerosene are frequently used in heating equipment such as fan heaters. In particular, in a combustion apparatus used for an application with a relatively small calorific value, for example, as in the combustor of Patent Document 1, a fuel gas is generated by vaporizing liquid fuel in a vaporization section, and the generated fuel gas is burned. Many types are used that are burned in the part.

In the combustion apparatus of Patent Document 2 which is the application of the present applicant, liquid fuel is attached to the heated inner wall of the bottomed cylindrical shape constituting the vaporizing section and evaporated on the surface of the inner wall to vaporize the fuel gas. Is generated. Further, a blower fan is provided to supply air to be mixed with the fuel gas.
Japanese Patent Publication No. 7-21332 JP 2004-60944 A

Incidentally, in recent years, in order to reduce the size of the entire combustion apparatus, there has been an increasing demand for downsizing a blower fan that occupies a large volume in the structure of the combustion apparatus. However, when the size of the blower fan is reduced, the blower capacity is reduced, so that the amount of primary air to be mixed with the fuel gas immediately after vaporization is reduced, which may cause deterioration of combustion.
Accordingly, an object of the present invention is to provide a combustion apparatus including a rotating member having a blowing capacity capable of sufficiently securing a primary air amount to be mixed with fuel gas immediately after vaporization even if the blower is downsized. .

  In order to solve the above-mentioned problems, the invention of claim 1 is a combustion apparatus that burns an air-fuel mixture in which fuel gas and air are mixed, and has a bottomed cylindrical shape that vaporizes liquid fuel to generate the fuel gas. An air supply mechanism for supplying air to the vaporization section is provided radially inward of the vaporization section, and the air supply mechanism is configured by a rotating member having a plurality of blades. The air supply mechanism is configured such that when the rotating member rotates, the air in the direction of the rotation axis of the rotating member is sucked, and the air flows along the blades from the inside of the rotating member to the outer edge side. The fuel gas and the air are mixed between the vaporizing unit and the air supply mechanism.

  According to a second aspect of the present invention, in the first aspect of the invention, the blade includes a circumferential portion along an outer edge of the rotating member, and an inward portion facing the inner direction of the rotating member, and the inward portion. Is set to be larger than the area of the circumference.

  In the first aspect of the present invention, since the air supply mechanism capable of supplying air to the vaporizing section that vaporizes the liquid fuel is provided, the primary air amount to be mixed with the fuel gas immediately after vaporization can be reduced even if the blower fan is downsized. It can be secured sufficiently. A rotary member having a plurality of blades that are formed in a cylindrical shape with a bottom and that is provided with an air supply mechanism radially inward of the vaporization section, and that can supply air from the inside to the outer edge side. Therefore, when the rotating member is rotated, negative pressure is generated inside the rotating member, the air around the center of the rotating member is sucked out in the axial direction, and the sucked air is removed from the rotating member. Can be sent to the edge side. Therefore, the fuel gas generated in the vaporization unit and the primary air supplied by the air supply mechanism can be mixed well between the vaporization unit and the air supply mechanism. Therefore, combustion can be stabilized.

  In the invention of claim 2, the blade has a circumferential portion along the outer edge of the rotating member and an inward portion facing the inner direction of the rotating member, and the area of the inward portion is that of the circumferential portion. Since it is set to be larger than the area, the air inside the rotating member can be efficiently swept out from the outer edge side of the rotating member, and the fuel gas immediately after vaporization and a sufficient amount of primary air can be mixed. .

  FIG. 1 is a sectional view of a combustion apparatus 1 embodying the present invention. The present invention is characterized in that the combustion apparatus 1 for burning fuel gas is provided with an air supply mechanism 17 for sufficiently supplying primary air to be mixed with the fuel gas immediately after vaporization. Prior to detailed description of the air supply mechanism 17, the overall configuration and schematic operation of the combustion apparatus 1 will be described.

  The combustion apparatus 1 is a downward combustion type (a so-called reverse combustion type in which a flame is jetted downward) built in a water heater or the like. Hereinafter, although the reverse combustion type combustion apparatus 1 will be described, the present invention can also be implemented for an upward combustion type combustion apparatus. As shown in FIG. 1, the combustion apparatus 1 is configured by sequentially stacking a blower 2, a drive machine unit 3, an air amount adjustment unit 4, a mixing unit 5, and a combustion unit 6 from above. A vaporization unit 7 is provided in the vicinity of the mixing unit 5 and the combustion unit 6, and an air flow path connected by a flow path forming member 13 is formed between the air amount adjustment unit 4 and the vaporization unit 7. Has been.

  The blower 2 is configured such that a fan 21 is rotatably arranged inside a concave housing 20 made by bending a steel plate, and an opening through which the fan 21 sucks air is located in the center of the housing 20. 22 is provided. Along with the downsizing of the combustion apparatus 1, a fan 21 having a lower output than the conventional combustion apparatus is employed.

  The drive machine unit 3 has a box 10, and a motor 30 is attached to the center of the top plate 12. The motor 30 includes rotary shafts 30a and 30b on the upper and lower sides, respectively. And the fan 21 is installed in the rotating shaft 30a above the motor 30, and the rotating member 8 is installed in the rotating shaft 30b below. The rotating member 8 is disposed inside the bottomed cylindrical vaporization section 7. When the motor 30 is driven, the fan 21 blows air (air supply) downward, and the rotating member 8 is simultaneously driven to rotate.

  The air amount adjusting unit 4 includes a disk-shaped moving side plate member 41 and a rectangular fixed side plate member 42, and the moving side plate member 41 is rotatably attached above the fixed side plate member 42. It has been. The moving side plate-like member 41 and the fixed side plate-like member 42 are respectively provided with shaft insertion holes 41a, 42a at the center, and a plurality of air holes (not shown) are provided around the shaft insertion holes 41a, 42a. It is provided. When the air holes provided in the moving side plate-like member 41 and the fixed side plate-like member 42 are completely coincident with each other, the air passage cross-sectional area becomes the maximum (fully open), and the moving side plate-like member 41 and the fixed side plate-like member 42 are opposed to each other The air passage cross-sectional area is adjusted according to the degree of closing the air hole on the side. The air passage cross-sectional area (opening degree) can be arbitrarily adjusted by changing the position (rotational position) of the moving-side plate-like member 41 with respect to the fixed-side plate-like member 42 by a step motor 40 described later. ing.

  The moving side plate member 41 can be driven to rotate by the step motor 40 as follows. The step motor 40 includes a drive shaft 40a. The drive piece 43 is engaged with the drive shaft 40 a, and the drive piece 43 is engaged with the engaging portion 41 a of the moving side plate-like member 41. When the step motor 40 is driven, the moving side plate-like member 41 is rotated via the drive shaft 40a, the drive piece 43, and the engaging portion 41a. The step motor 40 can be appropriately driven and stopped by a control mechanism (not shown).

  The flow path forming member 13 is made by bending a thin plate into a conical shape, and although not shown, the inside is a cavity and penetrates vertically. In other words, the flow path forming member 13 has openings in the upper and lower parts, and the upper opening is connected to the central part of the fixed-side plate member 42 described above, and the lower opening is used to introduce primary air described later. The cylinder 15 is connected.

  A fuel pipe (fuel supply pipe) 14 is fixed inside the flow path forming member 13. One end of the fuel pipe 14 is connected to a fuel supply source (not shown), and the other end extends downward through the flow path forming member 13 and the primary air introduction cylinder 15.

  A vaporizing section 7 is provided at the center of the flame hole base 60 disposed below the air adjusting section 4. A mixing unit 5 is provided in the vaporization unit 7, and a combustion unit 6 is annularly arranged so as to surround the vaporization unit 7. These components are housed in the housing 11.

  FIG. 2 is a partial cross-sectional perspective view of the vaporizing section 7 of the combustion apparatus 1 of FIG. The flame hole base 60 shown in FIG. 2 is made of, for example, aluminum die casting, and is provided with a complicated frame, opening, and groove. The upper surface side of the flame hole base 60 mainly functions as a flow path constituting surface of the fuel gas (air mixture) and secondary air, and the lower surface side functions as a flame hole mounting surface.

  That is, the flame hole base 60 is provided with grooves 63 partitioned by a large number of loop-shaped vertical walls 62, and grooves 64 are provided between the adjacent vertical walls 62. The fuel gas (air mixture) generated in the vaporization unit 7 is jetted from the groove 64 to the lower flame hole through the space between the upper surface wall 61 and the vertical wall 62 to generate a flame. Further, the secondary air supplied from the air amount adjusting unit 4 is ejected to both sides of the flame hole through the groove 63 to perform stable combustion.

  As shown in FIG. 2, the vaporizing unit 7 has a bottom wall portion 71 and a cylindrical side wall portion 72, and is a bottomed cylindrical body having an open top. The vaporizing unit 7 is attached to the central portion of the flame hole base 60. An electric heater 73 is provided in the bottom wall portion 71 of the vaporizing portion 7. When the electric heater 73 is energized, the bottom surface portion 71 is heated to raise the temperature, and this heat is conducted through the cylindrical side wall portion 72 of the vaporization portion 7 so that the vaporization portion 7 is entirely heated. .

  A rotating member 8 is fixed to a rotating shaft 30b extending downward of the motor 30 (FIG. 1). The rotating member 8 is formed by cutting and raising nine blades 8c radially from the outer peripheral edge of a disk body (plate body) 8a. Further, a hole 8b through which the rotary shaft 30b is inserted is provided at the center of the disc body 8a.

  The rotating member 8 having such a shape is manufactured by bending a metal plate whose outer shape is punched out by press working. That is, by pressing a metal flat plate, a substantially circular metal flat plate in which portions corresponding to the blades 8c are radially formed on the outer peripheral portion of the disk portion (disk body) 8a is punched to form the original plate of the rotating member 8. Form. Next, the rotating member 8 is formed by bending a portion corresponding to the punched metal flat blade 8c along the folding lines 8d and 8e.

  FIG. 3 is an exploded perspective view of a configuration in which the rotating member 8 (air supply mechanism 17) is fixed to the rotating shaft 30b. The rotating member 8 is rotated by passing a screw part 30c at the lower end of the rotating shaft 30b from above into the hole 8b of the disk body 8a, and further tightening a nut 16 on the screw part 30c protruding below the disk body 8a. It is fixed to the shaft 30b. As shown in FIG. 3, the cross section of the screw portion 30c is formed in a substantially D shape with a circular part cut out, and the hole 8b is also cut out of a part of the circle corresponding to the cross sectional shape of the rotating shaft 30b. If it is made substantially D-shaped, the rotating shaft 30b and the rotating member 8 can be configured to rotate integrally with each other. The rotating member 8 is engaged with the rotating shaft 30b in the rotating direction, and rotation failure of the rotating member 8 due to slight loosening of the nut is prevented. The rotating member 8 is integrated with the rotating shaft 30b and rotates counterclockwise.

  When the rotating member 8 rotates, the blades 8c are formed so that air flows from the center side of the rotating member 8 outward in the radial direction (or in the outer edge direction). When the rotating member 8 rotates, a negative pressure is generated at the central portion of the rotating member 8. Therefore, the air above the central part of the rotating member 8 is sucked, and the sucked air is sent to the outer side in the radial direction (or the outer edge direction) of the rotating member 8 as primary air. And primary air flows toward the cylindrical side wall part 72 of the vaporization part 7. FIG.

  As shown in FIG. 2, the other end of the above-described fuel pipe 14 is disposed above the rotating member 8 so that the opening faces the rotating member 8. When the rotating member 8 is rotated and liquid fuel is dripped from the fuel pipe 14, the dropped liquid fuel spreads radially on the rotating member 8 and further scatters by the action of centrifugal force, and the cylindrical side wall 72 of the vaporizing unit 7. Adhere to. The vaporization unit 7 is heated and heated in advance, and the liquid fuel evaporates (vaporizes) on the surfaces of the cylindrical side wall 72 and the bottom wall 71 of the vaporization unit 7 to generate fuel gas.

  The primary air supplied via the air supply mechanism 17 constituted by the rotating member 8 and the fuel gas generated from the liquid fuel are uniformly mixed by the mixing unit 5 to become an air-fuel mixture. The air-fuel mixture goes out of the bottomed cylindrical vaporization section 7 and is supplied to the combustion section 6 (FIG. 1) in the flame hole base 60 through the groove 64 to be burned.

Hereinafter, the configuration of the air supply mechanism 17 will be described in detail.
FIG. 4 is a plan view of the rotating member 8 (air supply mechanism 17) used in the combustion apparatus 1 of the present invention. FIG. 5 is a plan view of the rotating member 8 with some blades 8c of the rotating member 8 of FIG. 4 opened. Further, FIG. 6 is a perspective view of the rotating member 8 of FIG. The original plate of the rotating member 8 is formed by punching a metal plate by press work as described above. As shown in FIG. 5, folding lines 8d and 8e are set in the portion corresponding to the blade 8c of the original plate.

  FIGS. 7A to 7C are perspective views showing the procedure for assembling the blade 8c of the rotating member 8 of FIG. Fig.7 (a) has shown the blade | wing part immediately after stamping a metal plate by press work. In FIG. 6, the blade 8c at the position indicated by reference numeral 8g is bent 90 degrees along the folding line 8e, and FIG. 7B shows a perspective view thereof. Further, when bent 180 degrees along the folding line 8d, the state as shown in FIG. 7C is obtained, and the tip of the blade 8c faces the center direction of the rotating member 8 like the other seven blades 8c. . The air flows smoothly outward (outer edge side) in the radial direction of the rotating member 8 along the blades 8c bent along the folding lines 8d and 8e.

  Here, the angle 8f formed by the folding line 8e (cut-and-raised line) of the blade 8c and the tangent at the periphery of the disc portion 8a is set to satisfy 90 ° ≦ 8f ≦ 100 °. The air near the center of the disk portion 8a of the rotating rotating member 8 is pushed outward in the radial direction along the blades 8c, and is supplied to the mixing portion 5 shown in FIG. 2 as primary air. As a result, air is sucked from the axial direction so that no negative pressure is generated in the vicinity of the center of the disc portion 8a or so as to eliminate the negative pressure. The rotation speed of the rotating member 8 is set so as to ensure a sufficient amount of primary air to be supplied. The sufficient amount of primary air is not uniquely determined in consideration of the amount of vaporized fuel gas, but is preferably about 40 to 60% of the total amount of air, and particularly preferably about 50%.

  In order to eliminate the negative pressure generated in the vicinity of the center of the disc portion 8a, new air flows near the center of the disc portion 8a from above. This new air is supplied by blowing air from the fan 21 (FIG. 1). However, since the angle 8f of the blade 8c is set to be 90 degrees ≦ 8f ≦ 100 degrees, the rotating member 8 (air supply mechanism) 17) sucks air in excess of the air flow rate of the fan 21 to maintain the balance of air pressure.

  FIG. 8 is a plan view of another rotating member 18 (air supply mechanism 17). FIG. 9 is a perspective view of the rotating member 18 of FIG. As shown in FIG. 8, the blade 18c includes a circumferential portion 18k and an inward portion 18p. A folding line 18d is set at the boundary between the circumferential portion 18k and the inward portion 18p. In FIG. 8, the blade | wing 18c shown with the code | symbol 18g shows the state bent by the folding line 18e. Further, when bent, for example, by 60 degrees along the folding line 8d, a shape like the other seven blades 18c is obtained.

The blade 18c includes a circumferential portion 18k and an inward portion 18p. The area of the inward portion 18p is set to be larger than the area of the circumferential portion 18k.
The radially inner end of the blade 18c is deflected in the rotational direction (counterclockwise in the example of FIG. 8) from the center of the rotating member 18. Therefore, when the rotating member 18 rotates in the direction of the arrow (counterclockwise), the air near the center is pushed outward in the radial direction (outer edge side) by the blade 18c. As a result, a sufficient amount of primary air can be supplied to the mixing unit 5 (FIG. 2).

  FIG. 10 is a plan view of a rotating member 19 (air supply mechanism 17) different from those shown in FIGS. FIG. 11 is a perspective view of the rotating member 19 of FIG. The rotating member 19 has a configuration in which two rotating bodies 25 and 26 overlap each other. The disk part of the lower rotating body 25 is larger than the disk part of the upper rotating body 26, and the area of the blades of the upper rotating body 26 is larger than the area of the blades of the lower rotating body 25. Is set. Therefore, the tip of the blade 25 c of the rotating body 25 can be brought close to the vicinity of the center of the rotating member 19. Therefore, primary air can be supplied more efficiently than the rotating members 8 and 18 having only one rotating body.

  FIG. 12 is a plan view of a rotating member 23 (air supply mechanism 17) which is further different from the rotating members of FIGS. FIG. 13 is a perspective view of the rotating member 23 of FIG. The rotating member 23 has the characteristics of the rotating members 8 and 18 described above. Further, the disc portion 23a is provided with a plurality of holes 24 that are subjected to burring. Liquid fuel is dripped onto the upper surface of the rotating member 23 from the fuel pipe 14 (FIG. 1). The liquid fuel dropped on the rotating member 23 is dropped due to the burring hole 24 and cannot immediately move outward in the radial direction, and is substantially uniform over the entire circumference (entire area) of the disk portion 23a. Furthermore, it is scattered toward the vaporizing part 7 (FIG. 2) by centrifugal force, and adheres to the cylindrical side wall part 72 or the bottom wall part 71 (FIG. 2) without being partially biased, and is vaporized well.

  14 is a plan view of a rotating member having a shape different from any of the rotating members described above, and FIG. 15 is a perspective view of the rotating member of FIG. 16 is a plan view of a rotating member provided with a burring hole in the disc body of the rotating member of FIG. 14, and FIG. 17 is a perspective view of the rotating member of FIG. 14 and 16 are also set such that the area of the inward portion of the blade is larger than the area of the circumferential portion, and the combustion apparatus 1 of the present invention can be configured.

  FIG. 18 is an exploded perspective view of a rotating member 29 different from any of the rotating members described above. The rotating member 29 includes a rotating member main body 27 and an auxiliary member 28. When these are integrated (superposed), the rotating member 29 is in a state as shown in FIG. The rotating member main body 27 includes a blade 27c. The blade 27c has a circumferential portion 27a and an inward portion 27b. The auxiliary member 28 includes a blade 31.

  As shown in FIG. 19, when the rotating member main body 27 and the auxiliary member 28 are overlapped, the blades 27c and the blades 31 are alternately arranged. When the rotating member 29 rotates, the blade 27c pushes air outward in the radial direction, but the blade 31 inhibits the movement of air outward in the radial direction, and the fuel gas and air that have entered the rotating member 29 The effect of stirring (mixing) is produced.

  As described above, the rotating member in the combustion apparatus embodying the present invention is set so that the interval between adjacent blades is wide, and a wide cross-sectional area of the air passage is ensured. In addition, the rotation member is set so that the area of each blade that faces substantially inward in the radial direction is increased, so that when the rotation member rotates, the amount of pushing out the air radially outward is increased. It is configured. Furthermore, since the tip of the portion of each blade that faces substantially inward in the rotational direction is set to deflect toward the rotational direction of the rotating member, the air inside the rotating member is radially outward along each blade. It is easy to flow to the (outer edge side).

  Therefore, in the combustion apparatus 1 embodying the present invention, even if the blower 2 (fan 21) is downsized in order to reduce the size of the combustion apparatus 1, a sufficient amount of primary air can be secured, thereby stabilizing the combustion. It can be made.

It is sectional drawing of the combustion apparatus which implemented this invention. It is a fragmentary sectional perspective view of the vaporization part of the combustion apparatus of FIG. It is a disassembled perspective view of the structure which fixes a rotation member (air supply mechanism) to a rotating shaft. It is a top view of the rotation member (air supply mechanism) used with the combustion apparatus of this invention. It is a top view of the rotating member which opened a part of blade | wing of the rotating member of FIG. It is a perspective view of the rotation member of FIG. It is a perspective view which shows the assembly procedure of the blade | wing of the rotating member of FIG. It is a top view of the rotation member (air supply mechanism) used with the combustion apparatus of this invention different from FIG. It is a perspective view of the rotation member of FIG. It is a top view of the rotation member (air supply mechanism) used with the combustion apparatus of this invention different from FIG. 4, FIG. It is a perspective view of the rotation member of FIG. FIG. 11 is a plan view of another rotating member (air supply mechanism) different from the rotating member of FIGS. 4, 8, and 10. It is a perspective view of the rotation member of FIG. It is a top view of the rotation member (air supply mechanism) which can be employ | adopted for the combustion apparatus of this invention. It is a perspective view of the rotation member of FIG. It is a top view of the rotation member (air supply mechanism) which can be employ | adopted for the combustion apparatus of this invention. It is a perspective view of the rotation member of FIG. It is a disassembled perspective view of the rotation member (air supply mechanism) which can be employ | adopted for the combustion apparatus of this invention. It is a perspective view of the rotating member of FIG. 18 integrated.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Combustion device 2 Blower 3 Drive machine part 4 Air control part 5 Mixing part 6 Combustion part 7 Vaporization part 8 Rotating member 8c Blade 14 Fuel pipe 17 Air supply mechanism 18, 19 Rotating member 18k Circumferential part 18p of blade Inward part of blade 21 Fan 22 Opening 23 Rotating members 25 and 26 Rotating body 30 Motor 30b Rotating shaft 60 Flame hole base 71 Bottom wall portion 72 Cylindrical side wall portion 73 Electric heater

Claims (2)

A combustion apparatus for burning an air-fuel mixture in which fuel gas and air are mixed,
It has a bottomed cylindrical vaporization section that vaporizes liquid fuel to generate the fuel gas,
An air supply mechanism for supplying air to the vaporizer is provided radially inward of the vaporizer;
The air supply mechanism is composed of a rotating member having a plurality of blades,
The air supply mechanism is configured such that when the rotating member rotates, the air in the rotation axis direction of the rotating member is sucked, and further, the air flows along the blades from the inside of the rotating member to the outer edge side,
A combustion apparatus characterized in that fuel gas and air are mixed between the vaporization section and the air supply mechanism.   The blade has a circumferential portion along the outer edge of the rotating member, and an inward portion facing the inner direction of the rotating member, and the area of the inward portion is larger than the area of the circumferential portion. The combustion apparatus according to claim 1, wherein the combustion apparatus is set.

Images