JP2023128490A - combustion device - Google Patents

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

The present invention relates to a combustion device, and particularly to a combustion device including a nozzle body for fuel injection.

A combustion device equipped with an ignition component having a plurality of electrodes is disclosed in US Pat.
FIGS. 8(a) and 8(b) show the ignition component of this Patent Document 1. The ignition component of this combustion device has a plurality of electrodes held at intervals by an insulator section, and the insulator section is fixed to a burner mount via an ignition component mount 105.

Publication number 63-2772

The ignition component described in Patent Document 1 shown in FIG. 8(a) has exposed parts of two electrodes, electrodes 101 and 102, on the top surface of the insulator part 103, so if the exposed parts are exposed to water during maintenance. Another problem is that the two electrodes are electrically connected to each other, resulting in poor insulation between the two electrodes.
Furthermore, although a groove is formed between the two electrodes on the top surface of the insulator section 103 in FIG. 8(b), water may accumulate in the groove and the two electrodes may become electrically connected to each other.

The present invention has been made in view of this background, and an object of the present invention is to provide a combustion device that can suppress the occurrence of poor insulation between two electrodes.

The present invention has been made to achieve the above object, and in claim 1, an air passage is provided between a burner body having a nozzle body for fuel injection inside the burner body and the burner body outside the burner body. and a spark plug that ignites fuel injected from the nozzle body by discharge, the burner case includes a side plate portion surrounding a side surface of the burner case, and an upper part of the side plate portion. The spark plug includes a top plate part and a bottom plate part connected to a lower part of the burner body at a position facing the top plate part, and the spark plug includes an insulator part attached to the top plate part; two electrodes extending from the inside of the burner case to the outside thereof and spaced apart from each other, the insulator part being attached to the outside of the top plate part of the burner case. a bottom surface facing the outside of the burner case, a circumferential surface connecting the bottom surface and the top surface, and a groove provided in the top surface between the two electrodes, the groove comprising: A kamaboko that includes two end portions that intersect with the circumferential surface and a bottom portion that connects the two end portions, and a cross-sectional shape of the bottom portion that passes through the two end portions is convex toward the top surface side. It was characterized by the fact that it was

According to this invention, water adhering to the top surface or groove of the insulator does not stay in the insulator but flows, so even if the exposed parts of the two electrodes are exposed to water, poor insulation between the two electrodes can be suppressed. , it can be used with confidence.

Schematic configuration diagram of a combustion device in the first embodiment of the present invention A perspective view of the first embodiment of the present invention with other parts omitted A perspective view of essential parts in the first embodiment of the present invention View from arrow A in the first embodiment of the present invention BB sectional view in the first embodiment of the present invention A sectional view for explaining the first embodiment of the present invention View from arrow A for explaining the first embodiment of the present invention Schematic diagram of a prior art combustion device

A first embodiment of a combustion device 1 according to the present invention will be described with reference to FIGS. 1 to 6. Note that, in each figure, common components and components of the same type are denoted by the same reference numerals, and overlapping explanations thereof will be omitted as appropriate.

Reference numeral 1 denotes a pressure spray type combustion apparatus 1 according to the first embodiment, which heats a heat exchanger 21 provided at a lower part, and a burner main body 20 is disposed in a burner case 30 facing downward.

The burner body 20 includes a nozzle body 2 for fuel injection that injects fuel downward, a cylindrical straightening tube 3 having the nozzle body 2 in the center, and a burner inner tube 8 communicating with the lower side of the straightening tube 3. A spark plug 40 is provided that ignites fuel injected from the nozzle body 2 by discharge.

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

The straightening cylinder 3 has a cylindrical straightening cylinder main body 3a and a circular shape at the center of the bottom of the straightening cylinder main body 3a, which serves as an introduction port for the mixed air of fuel and air injected from the nozzle body 2 into the burner inner cylinder 8. an opening 14.
The straightening cylinder main body 3a has a plurality of first air holes 10 in the peripheral wall, and is equipped with a first stabilizer 15 formed of swirling vanes cut out radially downward.
Further, the rectifying tube 3 is fixed to the top plate portion 16 using a fastening member 33 such as a screw.

The nozzle body 2 passes through the top plate portion 16 and is connected to a fuel pump (not shown) provided outside the burner case 30.
Further, the nozzle body 2 is fixed to the center of the top plate portion 16 by a fastening member 33 such as a screw.

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.
Further, the top plate portion 16 is provided with an air outlet 9a that opens at a portion where the air blower 9 is attached and takes in air from the air blower 9.
Furthermore, 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.

As shown in FIGS. 2 and 3, the ignition plug 40 has an insulator section 41 attached to the top plate section 16, each extending from the inside to the outside of the burner case 30 through the insulator section 41, and mutually extending from the inside to the outside of the burner case 30. It includes two electrodes 43 spaced apart. Further, the ignition plug 40 is fixed to the top plate portion 16 by using an igniter 49 and a fastening member 33 such as a screw, and is directly connected to the igniter 49 to supply electric power for discharging.

As shown in FIGS. 3 and 4, the insulator section 41 has a bottom surface 41a attached to the outside of the top plate section 16 of the burner case 30, a top surface 41b facing outside of the burner case 30, a bottom surface 41a and a top surface. 41b, and a groove 42 provided in the top surface 41b between the two electrodes 43. Further, the insulator section 41 includes a holding section 41d that supports the electrode 43 on the top surface 41b.
The groove portion 42 includes two end portions 42a that intersect with the circumferential 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 semicircular and convex in a half-moon shape toward the top surface 41b.

Next, the combustion operation will be explained.

Air blown from the blower 9 into the burner case 30 through the air outlet 9a passes through the air passage 6, cools the bottom plate part 32 and the side plate part 7, and is directed toward the rectifier cylinder 3 and the burner inner cylinder 8. Air is blown.

The air blown into the straightening tube 3 cools the peripheral wall of the straightening tube 3, passes through the first air hole 10, and is blown into the inside of the straightening tube 3 as primary air. The primary air is blown into the rectifier tube 3 and the nozzle body 2 is cooled by relatively cooled air from the blower 9. The oil droplets injected 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 cylinder 8. .

The air blown into the burner inner cylinder 8 cools the peripheral wall of the burner inner cylinder 8, passes through the second air hole 12, and is blown into the burner inner cylinder 8 as secondary air. The secondary air is mixed with the flame in the burner inner cylinder 8 to suppress the generation of carbon monoxide and soot due to incomplete combustion.

By the way, in an oil or gas water heater installed indoors in which the combustion device 1 is mounted, there is a possibility that the spark plug 40 may be exposed to condensed water during maintenance.
Further, even in an oil or gas water heater installed outdoors in which the combustion device 1 is mounted, there is a possibility that the spark plug 40 may be exposed to water from raindrops as well as condensed water during maintenance.

Even in such a case, according to the present invention, the groove portion 42 has a semicircular cross-sectional shape in which the bottom portion 42b passing through the two end portions 42a is convex toward the top surface 41b, so that the spark plug 40 is exposed to water and water flows into the groove 42, the water separates and flows to the two terminal ends 42a as shown in FIG. Insulation defects can be suppressed and it can be used with peace of mind.

On the other hand, although FIG. 6A shows a case where the top surface 41b of the spark plug 40 is horizontal, there is a possibility that the horizontal adjustment of the combustion device 1 may not be sufficiently confirmed after maintenance. In particular, in oil or gas water heaters attached to the outer wall of a building, there is a possibility that the combustion device 1 may not be level after maintenance.

Even in such a case, according to the present invention, the cross-sectional shape of the bottom portion 42b of the groove portion 42 passing through the two end portions 42a has a semicircular shape that is convex toward the top surface 41b side. Even when the top surface 41b is not horizontal and is tilted several degrees as shown in FIG. Water does not accumulate in 42, and poor insulation between the two electrodes can be suppressed, so it can be used with peace of mind. Further, the same applies to the inclination direction in the case of FIG. 6(c).

On the other hand, as shown in FIG. 7, even if a capillary phenomenon occurs in the gap between the igniter 49 and the holding part 41d that supports the electrode 43 in the insulator part 41, according to the present invention, the groove part 42 prevents water from accumulating. Since the water is drained, poor insulation between the two electrodes can be suppressed.

Note that the other configurations used in this embodiment are presented as examples, and are not intended to limit the scope of the invention, and may be implemented in various other forms. Various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included within the scope and gist of the invention, as well as within the scope of the invention described in the claims and its equivalents.

1: Combustion device 2: Nozzle body 6: Air passage 7: Side plate portion 16: Top plate portion 20: Burner body 30: Burner case 32: Bottom plate portion 40: Spark plug 41: Insulator portion 41a: Bottom surface 41b: Top surface 41c: Surrounding surface 42: Groove portion 42a: End portion 42b: Bottom portion 43: Electrode

Claims (1)

a burner body equipped with a nozzle body for fuel injection inside;
a burner case forming an air passage between the burner body and the burner body;
a spark plug that ignites fuel injected from the nozzle body by electric discharge;
Equipped with
The burner case is
a side plate portion surrounding the side surface of the burner case;
a top plate portion that covers above the side plate portion;
a bottom plate portion connected to a lower part of the burner body at a position facing the top plate portion;
Equipped with
The spark plug is
an insulator section attached to the top plate section;
two electrodes each extending from the inside to the outside of the burner case through the insulator and spaced apart from each other;
Equipped with
The insulator part is
a bottom surface attached to the outside of the top plate portion of the burner case;
a top surface facing outside of the burner case;
a peripheral surface connecting the bottom surface and the top surface;
a groove provided in the top surface between the two electrodes;
Equipped with
The groove portion is
two end portions that intersect with the circumferential surface;
a bottom portion connecting between the two end portions;
Equipped with
The cross-sectional shape of the bottom passing through the two terminal ends is
A combustion device characterized in that the combustion device has a semicylindrical shape that is convex on the top surface side.

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