Combustion equipment

Abstract

To provide a burner allowing a worker to surely secure the positional relation of main burner components in the process of assembling the same and to make the assembly work simpler.SOLUTION: The burner comprises a straightening cylinder 3 comprising a nozzle body 2, and an ignition plug 40. A top plate 16 of the burner comprises a tilting wall section 16c disposed between an extended section 16a and an un-extended section 16b. The tilting wall section 16c comprises a circular arc 16d formed to have a shape of a circular arc at least congruent with a peripheral end 3c, in a plan view. A central angle 16g of a fan shape formed by the circular arc 16d is larger than 180 degrees. A first angle 3f formed by the peripheral end 3c and a flat section 3b of the straightening cylinder 3, and a second angle 16f formed by the circular arc 16d and the plane of the extended section 16a, are congruent. A first face 3e and a second face 16e are abutted to each other to form the straightening cylinder 3 on the extended section 16a.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a combustion device, and more particularly to a combustion device provided with a nozzle body for fuel injection. [Background technology]

[0002] 2. Description of the Related Art A combustion device called a gun-type burner, which pressurizes and injects liquid fuel, mixes it with air, and burns it, is known and is widely used in oil water heaters, oil hot water heaters, and the like. A gun-type burner has an ignition plug located near the nozzle that injects fuel, and the fuel from the nozzle is mixed appropriately with primary air and ignited by the discharge of the spark plug. The fuel passes through an opening in the burner inner tube below the nozzle, generating a stable flame inside the burner inner tube.

[0003] This type of spark plug is designed to simplify the assembly process by allowing the two electrodes of the spark plug to be installed while always maintaining a constant discharge gap, eliminating the need for the installer to adjust the plug tip when assembling the spark plug. For example, the one described in Patent Document 1 shown in FIG. 6 is known.

[0004] In a conventional combustion device 100, a burner inner cylinder 104 is provided inside a burner outer cylinder 101, forming a secondary air passage between the burner outer cylinder 101 and the burner inner cylinder 104, an ignition plug 117 is fixed to the outer wall of the burner outer cylinder 101 via a fixing metal fitting 121, a flow straightening cylinder 106 is connected to the upper part of the burner inner cylinder 104, and a nozzle body 108 that sprays fuel oil pressure-fed from an electromagnetic pump is provided inside the flow straightening cylinder 106. Furthermore, an opening 111 is provided in the center of the inside of the burner inner cylinder 104 in front of the nozzle body 108. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2003-329215 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, the assembly worker must not only adjust the discharge gap of the spark plug, but must also ensure appropriate gaps between the spark plug and the nozzle tip, and between the nozzle tip and the opening of the burner inner cylinder. In other words, if the spark plug and the nozzle tip are too far apart, it becomes difficult to spray fuel onto the discharge area, and ignition becomes impossible. Conversely, if they are too close, there is a risk that vibrations during transportation will cause the spark plug to come into contact with the nozzle tip, and ignition will also become impossible. Furthermore, if the central axis of the nozzle tip is misaligned with the central axis of the opening of the burner inner cylinder, the sprayed fuel will have difficulty passing through the opening, which may result in unstable combustion. Therefore, adjustment of these gaps is required during assembly, which results in reduced work efficiency and is a major problem.

[0007] The present invention has been made in consideration of the above background, and aims to provide a combustion device that can reliably ensure the positional relationship between the nozzle and the burner inner cylinder during the assembly process of these parts, thereby simplifying the assembly work and always ensuring reliable ignition and combustion, allowing it to be used safely. [Means for solving the problem]

[0008] The present invention has been made to achieve the above object, and in claim 1, there is provided a cylindrical straightening cylinder having a nozzle body for injecting fuel inside, a burner inner cylinder communicating with the straightening cylinder below, a burner case outside the burner inner cylinder and forming a first air passage between the burner inner cylinder and the burner inner cylinder, and an ignition plug for igniting fuel injected from the nozzle body by electric discharge, wherein the burner case has a side plate portion surrounding a side surface of the burner case, a top plate portion covering an upper portion of the side plate portion, and a spark plug disposed opposite the top plate portion. and a bottom plate portion connected to the lower portion of the burner inner cylinder, the straightening cylinder comprising a cylindrical straightening cylinder main body portion, a flange-shaped flat portion at the upper end of the straightening cylinder main body portion, a peripheral end portion having a circular outer periphery that is curved back from the flat portion toward the straightening cylinder main body portion on the outer periphery of the flat portion, a bottom portion located at the lower end of the straightening cylinder main body portion, and a circular opening portion at the center of the bottom portion that serves as an introduction port for a mixture of fuel and air injected from the nozzle body into the burner inner cylinder, the central axis of the opening portion and the central axis of the peripheral end portion coincide with each other, and the peripheral end portion is a burner case provided on the burner case support of the burner case member and a burner case member provided on the burner case support of the burner case member, the burner case being connected to an upper surface of the flat portion, the burner case being connected to an upper surface of the burner case support of the burner case member and a burner case member provided on the burner case support of the burner case member ... the inner surface of the straightening tube is defined as a second surface, the second surface is arranged to face downward, a first angle formed by the first surface and the flat portion on the downward side of the straightening tube and a second angle formed by the second surface and a plane of the protrusion portion on the inner side of the burner case are arranged to coincide, the nozzle body is provided at the center of the arc portion in the protrusion portion, the ignition plug is provided with the protrusion portion as a base point, and the straightening tube is provided on the protrusion portion with the first surface and the second surface abutting each other.

[0009] In claim 2, the protruding portion has a plurality of case side mounting members that fasten the flat portion and the protruding portion, the flat portion has a combustion tube side mounting member that pairs with the case side mounting member, the case side mounting member is a mounting hole, and the combustion tube side mounting member is a mounting hole that pairs with the case side mounting member and is fixed using a fastening member. Effect of the Invention

[0010] According to this invention, the accuracy of the central position of the combustion tube and the nozzle can be reliably ensured, so that adjustments by the worker are not required during assembly, the assembly work is simplified, and ignition and combustion can be always performed reliably, allowing for safe use. [Brief description of the drawings]

[0011] [Figure 1] 1 is a schematic diagram of a combustion device according to a first embodiment of the present invention; [Diagram 2] FIG. 1 is a plan view of a combustion device according to a first embodiment of the present invention; [Diagram 3] FIG. 1 is a cross-sectional view of a BCDE before assembly of a combustion device according to a first embodiment of the present invention. [Figure 4] FIG. 1 is a cross-sectional view of a BCDE after assembly of a combustion device according to a first embodiment of the present invention. [Diagram 5] FIG. 1 is a cross-sectional view illustrating a first embodiment of the present invention. [Figure 6] Cross-sectional view of a prior art combustion device DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] A first embodiment of a combustion device 1 according to the present invention will be described with reference to Figures 1 to 5. In each figure, common components or similar components are denoted by the same reference numerals, and duplicated descriptions thereof will be omitted as appropriate.

[0013] Reference numeral 1 denotes a pressure spray type combustion device 1 according to the first embodiment, which heats a heat exchanger 21 provided at the bottom, and has a burner body 20 disposed in a burner case 30 facing downward.

[0014] The burner body 20 is equipped with a nozzle body 2 for fuel injection that injects fuel downward, a cylindrical straightening tube 3 with the nozzle body 2 at its center, a burner inner tube 8 that communicates with the lower part of the straightening tube 3, and an ignition plug 40 that ignites the fuel injected from the nozzle body 2 by electrical discharge.

[0015] The burner case 30 comprises a side plate portion 7 that surrounds the side surface of the burner case 30, a top plate portion 16 that covers the upper part of the side plate portion 7, and a bottom plate portion 32 that connects to the lower part of the burner inner cylinder 8 at a position opposite the top plate portion 16.

[0016] The straightening tube 3 comprises a cylindrical straightening tube main body 3a, a flange-shaped flat portion 3b at the upper end of the straightening tube main body 3a, a peripheral end portion 3c with a circular outer periphery that is curved back from the flat portion 3b toward the straightening tube main body 3a on the outer periphery of the flat portion 3b, a bottom portion 3d located at the lower end of the straightening tube main body 3a, and a circular opening portion 14 at the center of the bottom portion 3d that serves as an introduction port for the mixed air of fuel and air injected from the nozzle body 2 into the burner inner tube 8. Furthermore, the straightening tube 3 has a plurality of first air holes 10 in the peripheral wall of the straightening tube main body 3a, and is equipped with a first stabilizer 15 composed of swirl vanes cut out radially downward.

[0017] In addition, the central axis of the opening 14 and the central axis of the peripheral end 3c are formed to coincide with each other, and the peripheral end 3c has a first surface 3e that is connected to the upper surface of the flat portion 3b, the first surface 3e is formed to face upward, and is formed so that the first surface 3e and the flat portion 3b form a first angle 3f, for example 120 degrees, on the lower side of the straightening tube 3.

[0018] The top plate portion 16 has a protruding portion 16a that protrudes upwardly at approximately the center of the top plate portion 16 and has a surface large enough to cover the peripheral end portion 3c, and an inclined wall portion 16c between the protruding portion 16a and the non-protruding portion 16b of the top plate portion 16. The inclined wall portion 16c has an arc portion 16d formed in an arc shape that matches the peripheral end portion 3c in a plan view, and the central angle 16g of the sector formed by the arc portion 16d is greater than 180 degrees, for example, 210 degrees. Furthermore, the plane of the protruding portion 16a is parallel to the plane of the non-protruding portion 16b, and if the inner surface of the arc portion 16d on the burner case 30 is defined as a second surface 16e, the second surface 16e is arranged to face downward.

[0019] A second angle 16f that the second surface 16e and the plane of the protruding portion 16a form with the inside of the burner case 30 is formed at an angle that coincides with the first angle 3f.

[0020] The nozzle body 2 is fixed to the center of the arcuate portion 16d of the protruding portion 16a by a fastening member such as a screw.

[0021] Further, the spark plug 40 is directly connected to an igniter 41 and is supplied with electric power for discharge. The igniter 41 is fixed to the protruding portion 16a by a fastening member 43 such as a screw. More specifically, the igniter 41 is fixed to the protruding portion 16a at a location other than the sector shape formed by the arc portion 16d as shown in FIG. 2.

[0022] The straightening tube 3 is fixed to the protruding portion 16a by abutting the first surface 3e of the peripheral end portion 3c facing upward against the second surface 16e of the inclined wall portion 16c of the top plate portion 16 facing downward using a fastening member 33 such as a screw.

[0023] Four case side mounting members 51 for fixing the flow straightening tube 3 and the top plate portion 16 are provided on the protruding portion 16a, and the four case side mounting members 51 are mounting holes and are arranged at equal intervals from each other and at an equal distance from the center of the arc portion 16d. The flat portion 3b has four combustion cylinder side mounting members 52 that pair with the case side mounting members 51, and the four combustion cylinder side mounting members 52 are mounting holes for fixing using fastening members 33.

[0024] The burner inner cylinder 8 has a plurality of second air holes 12 on the peripheral wall.

[0025] The nozzle body 2 and the flow straightening cylinder 3 are fixed to the top plate portion 16. The nozzle body 2 penetrates the top plate portion 16 and is connected to a fuel pump (not shown) provided on the outside of the burner case 30.

[0026] Reference numeral 9 denotes a blower 9 that is attached to the top plate portion 16 of the burner case 30 and blows air into the burner case 30. The top plate portion 16 is provided with an air outlet 9a that opens at the attachment portion of the blower 9 and takes in air from the blower 9. In addition, a first air passage 6 is provided between the burner inner cylinder 8 and the burner case 30 .

[0027] As shown in Figure 5, the straightening tube 3 and the top plate portion 16 abut against each other at a first surface 3e, which is the upper surface of the peripheral end portion 3c, and a second surface 16e, which is the inner surface of the burner case 30 of the arc portion 16d, and are fastened and fixed together using a fastening member 33 such as a screw using a case side mounting member 51 and a combustion tube side mounting member 52.

[0028] Next, the combustion operation will be described.

[0029] The air blown from the blower 9 through the air outlet 9a into the burner case 30 passes through the first air passage 6 to cool the bottom plate portion 32 and the side plate portion 7, and is blown toward the flow straightening cylinder 3 and the burner inner cylinder 8.

[0030] The air sent to the flow straightening cylinder 3 cools the peripheral wall of the flow straightening cylinder 3, passes through the first air hole 10, and is sent as primary air into the inside of the flow straightening cylinder 3. The primary air is sent into the inside of the flow straightening cylinder 3, and cools the nozzle body 2 with the relatively cool air from the blower 9. The oil droplets injected from the nozzle body 2 are mixed with the primary air and ignited by the discharge of the spark plug 40 , passing through the opening 14 and forming a downward flame in the burner inner cylinder 8 .

[0031] In addition, the air sent to the burner inner cylinder 8 cools the peripheral wall of the burner inner cylinder 8, passes through the second air hole 12, and is sent as secondary air into the inside of the burner inner cylinder 8. The secondary air is mixed with the flame in the burner inner cylinder 8, and suppresses the generation of carbon monoxide and soot due to incomplete combustion.

[0032] According to the present invention, the arc portion 16d of the inclined wall portion 16c is formed in an arc shape that matches the peripheral end portion 3c in a plan view, and the central angle 16g of the sector formed by the arc portion 16d is set to be greater than 180 degrees. Furthermore, a first angle 3f formed between the first surface 3e and the flat portion 3b on the lower side of the flow straightening tube 3, and a second angle 16f formed between the second surface 16e and the plane of the protruding portion 16a on the inside of the burner case 30 are set to be the same angle as the first angle 3f. Moreover, the flow straightening cylinder 3 and the top plate portion 16 are fixed together by abutting the first surface 3e and the second surface 16e. Therefore, as the flow straightening tube 3 approaches the protruding portion 16a in order to fix the flow straightening tube 3 to the protruding portion 16a, the central axis of the flow straightening tube 3 and the central axis of the arc portion 16d are guided in a direction that coincides with each other.

[0033] Furthermore, according to the present invention, an opening 14 is provided in the center of the bottom 3d of the straightening cylinder 3, the nozzle body 2 is fixed to the center of the arc portion 16d of the protruding portion 16a, the igniter 41 is similarly fixed to the protruding portion 16a, and the ignition plug 40 is directly connected to the igniter 41.

[0034] This allows the straightening tube 3 to be reliably and easily assembled with the central axis of the arcuate portion 16d aligned, and the nozzle body 2 can be reliably provided at the center of the cylindrical straightening tube 3. Since the nozzle body 2 and the igniter 41 are fixed using one part of the overhanging portion 16a as a base point, the positional relationship between the ignition plug 40, which is directly connected to the nozzle body 2 and the igniter 41, and the opening 14 of the straightening tube 3 is ensured with high precision, and since the overhanging portion 16a provides high rigidity against distortion of the top plate portion 16, the gaps between the nozzle body 2 and the ignition plug 40, and between the nozzle body 2 and the opening 14 are less susceptible to distortion, and stable combustion can be obtained. Therefore, there is no need for adjustments by the worker during assembly to ensure the accuracy of the center of the straightening cylinder 3 and the center of the nozzle body 2 attached to the top plate portion 16, which not only simplifies the assembly work but also ensures reliable ignition and combustion at all times, allowing for safe use.

[0035] It is also possible to fix the spark plug 40 directly to the protruding portion 16a using a fixing bracket, connect the spark plug 40 and the igniter 41 with a lead wire, and fix the igniter 41 to a location other than the protruding portion 16a.In this case, the central angle 16g of the sector formed by the arc portion 16d may be formed at 360 degrees, which is greater than 180 degrees.

[0036] In addition, the central angle 16g of the sector formed by the arc portion 16d may be formed at 360 degrees which is greater than 180 degrees, the protruding portion 16a of the top plate portion 16 may be formed to protrude downward beyond the non-protruding portion 16b, and the peripheral end portion 3c of the straightening tube 3 may be formed to be curved upward beyond the flat portion 3b. These modifications are within the range of what a person skilled in the art would think of, and will produce the same effect as described above.

[0037] The arc of the arc portion 16d does not have to be a perfect arc, and as long as the central axis of the peripheral end portion 3c, which has a circular outer shape, and the central axis of the arc portion 16d can be substantially aligned, the central axis of the straightening tube 3 and the central axis of the arc portion 16d can be aligned when assembled, and the same effect as described above can be achieved.

[0038] The other configurations used in the present embodiment are presented as examples, and are not intended to limit the scope of the invention, and may be embodied in various other forms, and various omissions, substitutions, and modifications may be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are included in the invention and its equivalents described in the claims. [Explanation of symbols]

[0039] 1: Combustion equipment 2: Nozzle body 3: Rectifier tube 3a: Rectifier tube body part 3b: Flat part 3c: Peripheral end 3d: bottom 3e: First Side 3f: First angle 6: First air passage 7: Side plate part 8: Burner inner cylinder 10: First air vent 12: Second air vent 14: Opening 15: First stabilizer 16: Top plate 16a: Overhang 16b: Non-overhanging part 16c: Slanted wall part 16d: Arc section 16e: Second Side 16f: Second angle 16g: Center angle 20: Burner body 21: Heat exchanger 30: Burner case 32: Bottom plate part 33: Fastening member 40: Spark plug 51: Case side mounting member 52: Combustion tube side mounting member

Claims

1. a cylindrical flow straightening tube having a nozzle body for fuel injection therein; A burner inner cylinder communicating below the straightening cylinder; a burner case that is disposed outside the burner inner cylinder and that forms a first air passage between the burner inner cylinder and the burner case; a spark plug that ignites the fuel injected from the nozzle body by electrical discharge; Equipped with The burner case is A side plate portion surrounding a side surface of the burner case; A top plate portion covering an upper portion of the side plate portion; A bottom plate portion connected to a lower portion of the burner inner cylinder at a position opposite to the top plate portion; Equipped with The flow straightening cylinder is A cylindrical flow straightening tube main body, a flange-shaped flat portion at an upper end of the straightening cylinder main body; a peripheral end portion having a circular outer periphery, the peripheral end portion being curved toward the main body portion of the flow straightening tube from the flat portion; a bottom portion located at a lower end of the flow straightening tube main body portion; a circular opening at the center of the bottom serving as an inlet for introducing a mixture of fuel and air injected from the nozzle body into the burner inner cylinder; Equipped with The central axis of the opening coincides with the central axis of the peripheral end, the peripheral edge portion has a first surface continuous with an upper surface of the flat portion, The first surface is provided to face upward, The top plate portion is A protruding portion that covers the peripheral end portion and protrudes upward; an inclined wall portion provided between the protruding portion and the non-protruding portion of the top plate portion; Equipped with The inclined wall portion has an arc portion formed in an arc shape that coincides with at least the peripheral end portion in a plan view, The central angle of the sector formed by the arc portion is greater than 180 degrees, a plane of the protruding portion is parallel to a plane of the non-protruding portion; When the inner surface of the burner case of the arc portion is defined as a second surface, the second surface is provided to face downward, a first angle formed by the first surface and the flat portion on a lower side of the flow straightening cylinder; The second surface and the plane of the protruding portion are provided to coincide with each other at a second angle formed on the inside of the burner case, The nozzle body is provided at the center of the arc portion of the protruding portion, The spark plug is provided with the protruding portion as a base point, The straightening cylinder is provided on the protruding portion with the first surface and the second surface in contact with each other. A combustion device characterized by:

2. the protruding portion has a plurality of case side mounting members that fasten the flat portion and the protruding portion, the flat portion has a combustion liner side mounting member that mates with the case side mounting member, The case side mounting member is a mounting hole, The combustion cylinder side mounting member is a mounting hole for pairing with the case side mounting member and fixing the same using a fastening member.

2. The combustion device according to claim 1 .

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