Combustion equipment

Abstract

To provide a combustion device capable of suppressing occurrence of insulation failure between two electrodes.SOLUTION: In a combustion device including a burner main body 20 including a nozzle body 2, and an ignition plug 40 for ignition by discharge, the ignition plug 40 includes an insulator portion 41 mounted on a top plate portion, and two electrodes 43. The insulator portion 41 includes a bottom surface 41a mounted outside of the top plate portion, a top surface 41b facing outward from a burner case, a peripheral surface 41c connecting the bottom surface and the top surface, and a groove portion 42 disposed in the top surface between two electrodes. The groove portion 42 includes two terminal end portions 42a crossing the peripheral surface 41c, and a bottom portion 42b connecting two terminal end portions 42a. A cross-sectional shape of the bottom portion 42b passing two terminal end portions 42a is a semi-cylindrical shape projecting toward a top surface 41b side.SELECTED DRAWING: Figure 4

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] Patent Document 1 discloses a combustion device equipped with an ignition component having a plurality of electrodes. 8(a) and (b) show the ignition component of Patent Document 1. The ignition component of this combustion device has multiple electrodes held at intervals by an insulator, and the insulator is fixed to the burner mounting base via an ignition component mounting base 105. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Jpn. Jpn. Published No. 63-2772 Summary of the Invention [Problem to be solved by the invention]

[0004] The ignition component described in Patent Document 1 in FIG. 8(a) has two exposed electrodes, electrode 101 and electrode 102, on the top surface of insulator part 103. If the exposed parts become wet during maintenance, the two electrodes will become conductive to each other, causing poor insulation between the two electrodes. Furthermore, in FIG. 8(b), a groove is formed between the two electrodes on the top surface of the insulator part 103, and water may accumulate in the groove, which may similarly cause the two electrodes to become conductive to each other.

[0005] The present invention has been made in view of the above background, and has an object to provide a combustion device capable of suppressing the occurrence of insulation failure between two electrodes. [Means for solving the problem]

[0006] The present invention has been made to achieve the above object, and in claim 1, there is provided a burner body having a nozzle body for injecting fuel on the inside, a burner case on the outside of the burner body forming an air passage between the burner body and the burner case, and an ignition plug for igniting fuel injected from the nozzle body by electric discharge, the burner case having a side plate portion surrounding the side surface of the burner case, a top plate portion covering the upper part of the side plate portion, and a bottom plate portion connecting with a lower part of the burner body at a position opposite to the top plate portion, and the ignition plug has an insulator portion attached to the top plate portion, and two electrodes extending from the inside to the outside of the burner case through the insulator part and arranged at a distance from each other, the insulator part having a bottom surface attached to the outside of the top plate part of the burner case, a top surface facing the outside of the burner case, a circumferential surface connecting the bottom surface and the top surface, and a groove part provided in the top surface between the two electrodes, the groove part having two end portions intersecting with the circumferential surface and a bottom portion connecting between the two end portions, and the cross-sectional shape of the bottom portion passing through the two end portions is a kamaboko shape that is convex toward the top surface. Effect of the Invention

[0007] According to this invention, water adhering to the top surface or groove of the insulator flows away without remaining on the insulator, so that even if the exposed parts of the two electrodes become wet, poor insulation between the two electrodes is suppressed, making it safe to use. [Brief description of the drawings]

[0008] [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 perspective view of a first embodiment of the present invention, with only essential parts omitted; [Diagram 3] FIG. 1 is a perspective view of a main part according to a first embodiment of the present invention; [Figure 4] FIG. 1 is a view taken along the arrow A in a first embodiment of the present invention. [Diagram 5] BB cross-sectional view in the first embodiment of the present invention. [Figure 6]FIG. 1 is a cross-sectional view illustrating a first embodiment of the present invention. [Figure 7] FIG. 1 is a view taken along an arrow A for explaining a first embodiment of the present invention; [Figure 8] Schematic diagram of a prior art combustion device DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] A first embodiment of a combustion device 1 according to the present invention will be described with reference to Fig. 1 to Fig. 6. In each drawing, common components or similar components are denoted by the same reference numerals, and duplicated descriptions thereof will be omitted as appropriate.

[0010] 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.

[0011] 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 is connected to 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.

[0012] 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.

[0013] The straightening tube 3 has a cylindrical straightening tube main body 3a and a circular opening 14 at the center of the bottom of the straightening tube main body 3a, which serves as an inlet for the mixed air of fuel and air injected from the nozzle body 2 into the burner inner tube 8. The straightening cylinder main body 3a has a plurality of first air holes 10 in the peripheral wall, and is provided with a first stabilizer 15 composed of swirl vanes cut out radially downward. The flow straightening cylinder 3 is fixed to the top plate portion 16 using fastening members 33 such as screws.

[0014] 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 . Moreover, the nozzle body 2 is fixed to the center of the top plate portion 16 by a fastening member 33 such as a screw.

[0015] 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. Additionally, top panel portion 16 is provided with air outlet 9a which opens at the attachment portion of blower 9 and takes in air from blower 9. In addition, an air passage 6 is provided between the burner inner cylinder 8 and the burner case 30 . The burner inner cylinder 8 has a plurality of second air holes 12 in the peripheral wall.

[0016] 2 and 3, the ignition plug 40 includes an insulator 41 attached to the top plate 16, and two electrodes 43 that extend from the inside to the outside of the burner case 30, penetrating the insulator 41, and arranged at a distance from each other. The ignition plug 40 is fixed to the top plate 16 by fastening together with an igniter 49 using a fastening member 33 such as a screw, and is directly connected to the igniter 49 to receive power for discharge.

[0017] 3 and 4, the insulator part 41 has a bottom surface 41a attached to the outside of the top plate part 16 of the burner case 30, a top surface 41b facing the outside of the burner case 30, a peripheral surface 41c connecting the bottom surface 41a and the top surface 41b, and a groove part 42 provided on the top surface 41b between two electrodes 43. The insulator part 41 also has a holding part 41d on the top surface 41b that supports the electrode 43. The groove portion 42 includes two end portions 42a that intersect with the peripheral surface 41c, and a bottom portion 42b that connects the two end portions 42a. As shown in FIG. 5, the cross-sectional shape of the bottom portion 42b passing through the two end portions 42a is a semi-cylindrical shape that is convex in a half-moon shape toward the top surface 41b.

[0018] Next, the combustion operation will be described.

[0019] The air blown from the blower 9 through the air outlet 9a into the burner case 30 passes through the air passage 6 to cool the bottom plate portion 32 and the side plate portion 7, and is then blown toward the flow straightening cylinder 3 and the burner inner cylinder 8.

[0020] The air sent to the rectifier tube 3 cools the peripheral wall of the rectifier tube 3, passes through the first air hole 10, and is sent as primary air into the interior of the rectifier tube 3. The primary air is sent into the interior of the rectifier tube 3, and cools the nozzle body 2 with the relatively cool air from the blower 9. The oil droplets sprayed from the nozzle body 2 form mixed air with the primary air, are ignited by the discharge of the spark plug 40, pass through the opening 14, and form a downward flame in the burner inner tube 8.

[0021] 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.

[0022] Incidentally, in an oil or gas water heater installed indoors and equipped with the combustion device 1, there is a possibility that the ignition plug 40 may become wet with condensed water during maintenance. Furthermore, even when the combustion device 1 is mounted on an oil or gas water heater installed outdoors, there is a possibility that the spark plug 40 may become wet due to condensation water or raindrops during maintenance.

[0023] Even in such a case, according to the present invention, the cross-sectional shape of bottom 42b of groove 42 passing through two end portions 42a is kamaboko-shaped, being convex toward top surface 41b. Therefore, when the ignition plug 40 is wetted and water flows into groove 42, the water splits and flows toward two end portions 42a, as shown in Figure 6(a). This prevents water from accumulating in groove 42, suppresses insulation failure between the two electrodes, and allows for safe use.

[0024] On the other hand, Fig. 6(a) shows a case where the top surface 41b of the spark plug 40 is horizontal, but there is a possibility that the horizontal adjustment of the combustion device 1 may not be sufficiently confirmed after maintenance. In particular, in an oil or gas water heater attached to the outer wall of a building, there is a possibility that the horizontality of the combustion device 1 may not be ensured after maintenance.

[0025] Even in such a case, according to the present invention, the cross section of the bottom 42b of the groove 42 passing through the two end portions 42a is in a semi-cylindrical shape that is convex toward the top surface 41b, so that even when the top surface 41b is not horizontal but tilted by several degrees as shown in Fig. 6(b), when water flows into the groove 42, the water flows separately to the two end portions 42a in the same way as when the top surface 41b is horizontal, so water does not accumulate in the groove 42, insulation failure between the two electrodes can be suppressed, and the device can be used safely. The same is true for the tilt direction in Fig. 6(c).

[0026] On the other hand, as shown in FIG. 7, even if capillary action occurs in the gap between the holding portion 41d supporting the electrode 43 in the insulator portion 41 and the igniter 49, according to the present invention, the groove portion 42 allows water to drain without accumulating, thereby suppressing poor insulation between the two electrodes.

[0027] 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]

[0028] 1: Combustion equipment 2: Nozzle body 6: Air passage 7: Side plate part 16: Top plate 20: Burner body 30: Burner case 32: Bottom plate part 40: Spark plug 41: Insulator section 41a: Bottom 41b: Top 41c: Peripheral surface 42: Groove 42a: Termination part 42b: Bottom 43: Electrode

Claims

[Claim 1] A burner body having a nozzle body for fuel injection therein; a burner case that is disposed outside the burner body and that forms an air passage between the burner body 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 body at a position opposite to the top plate portion; Equipped with The spark plug is an insulator portion attached to the top plate portion; Two electrodes each extending from the inside to the outside of the burner case through the insulator portion and spaced apart from each other; Equipped with The insulator portion is A bottom surface attached to the outer side of the top plate portion of the burner case; A top surface facing the outside of the burner case; A peripheral surface connecting the bottom surface and the top surface; A groove portion provided on the top surface between the two electrodes; Equipped with The groove portion is two end portions intersecting the circumferential surface; a bottom portion connecting the two end portions; Equipped with The cross-sectional shape of the bottom passing through the two end portions is The top surface is convex in a kamaboko shape. A combustion device characterized by:

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