JP2023113042A - Combustion device - Google Patents

Abstract

To provide a combustion device capable of distributing wind direction of air introduced from an air blower only with a simple component, and stabilizing flame of the combustion device.SOLUTION: A combustion device includes: a rectification cylinder 3 having a nozzle body 2 inside; a burner inner cylinder 8 having a plurality of first air holes 10 on a peripheral wall and connected to a downstream end of the rectification cylinder 3; a blower 9 mounted on a top plate portion 16; and an air blowing port 9a. A wind direction member 40 is disposed near the air blowing port 9a, and the wind direction member 40 includes a wind direction portion 41 for changing a wind direction. The wind direction portion 41 is positioned at an upper part with respect to an upper end portion of a heat shielding plate 31 positioned outside of the burner inner cylinder 8 and covers only a part of an opening area of the air blowing port 9a. The air distributed from the air blowing port 9 is distributed to a first wind direction to be distributed toward the rectification cylinder 3, a second wind direction to be distributed toward the inside of a second air path 6b, and a third wind direction to be distributed toward a side plate portion 7.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion device, and more particularly to a combustion device provided with a nozzle body for fuel injection.

A combustion device called a gun-type burner, which pressurizes and injects liquid fuel, mixes with air and burns, is known, and is widely used in kerosene water heaters, kerosene hot water heaters, and the like.
Some gun-type burners supply primary air to the vicinity of a nozzle that injects fuel so that the fuel and air are properly mixed, thereby generating a stable flame.
For example, one described in Patent Document 1 is known.

As shown in FIG. 4, in the conventional combustion device 100 of Patent Document 1, the fuel injected from the fuel injection nozzle 107 is mixed with the air from the blower 101, ignited by the spark plug 108, and mainly in the combustion cylinder 106. Burn in.

Air that has entered the nozzle storage inner cylinder 103a through the air holes 110 provided on the side surface of the nozzle storage inner cylinder 103a passes around the fuel injection nozzle 107 and is sent into the combustion cylinder 106 together with fuel.

The air introduced into the burner case 102 from the blower 101 circulates inside the burner case 102 to cool the bottom and side walls of the burner case 102, and then enters the nozzle housing inner cylinder 103a to become primary air, resulting in radiant heat. cooling the fuel injection nozzle 107 that has received the

JP-A-11-182813

However, since the air itself is warmed by the heat of combustion when swirling in the burner case 102, the air entering the nozzle housing inner cylinder 103a is less effective in cooling the fuel injection nozzle 107 which receives radiant heat. could have been.

If the heat dissipation of the fuel injection nozzle 107 is impeded, the temperature of the fuel injection nozzle 107 rises, promoting the oxidation of kerosene to produce tar, narrowing the ejection hole of the fuel injection nozzle 107, and destabilizing the flame. was there.

SUMMARY OF THE INVENTION The present invention has been made in view of such a background, and provides a combustion apparatus capable of stabilizing the flame of the combustion apparatus by distributing the flow of air introduced from an air blower using only simple components. It is intended for

SUMMARY OF THE INVENTION The present invention has been made to achieve the above objects. a burner inner cylinder communicating below the burner inner cylinder; a heat shield plate forming a first air passage between the burner inner cylinder and the burner inner cylinder outside the burner inner cylinder; and a burner case covering the heat shield plate. The burner case includes a side plate portion forming a second air passage communicating with the first air passage between the heat shield plate and the heat shield plate outside the heat shield plate, and a top plate covering an upper side of the side plate portion. and a bottom plate portion connected to the lower portion of the burner inner cylinder at a position facing the top plate portion and connected to the lower portion of the heat shield plate, and is attached to the top plate portion of the burner case. and a blower port opened in the mounting portion of the blower in the top plate portion, and an airflow direction member is mounted in the vicinity of the blower port in the burner case, and the wind direction member is connected to the blower a wind direction part for changing the wind direction of part of the air from the burner, a base end part for fixing the wind direction part and the burner case, and fixing the distance between the wind direction part and the air blow port at a first distance; The wind direction portion is located above the upper end of the heat shield plate, has a plane perpendicular to the direction of the wind from the blower, and when the inside of the burner case is viewed from the blow port, the blower The air that covers only a part of the opening area of the mouth and is blown into the burner case from the blower through the blowing port is in a first wind direction blown toward the rectifying cylinder by the wind direction section. , a second airflow direction in which air is blown into the second air passage without passing through the airflow direction portion, and a third airflow direction in which air is blown toward the side plate portion by the airflow direction portion; Characterized.

According to the present invention, the direction of the air introduced from the blower can be distributed using only simple components, and the flame of the combustion device can be stabilized.

1 is a schematic configuration diagram of a combustion device according to a first embodiment of the present invention; FIG. 1 is a view of a combustion apparatus according to a first embodiment of the present invention as viewed from arrow A. FIG. 1 is a perspective view for explaining air flow in a combustion device according to a first embodiment of the present invention; FIG. Sectional view 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 3. FIG. In addition, in each figure, the same code|symbol is attached|subjected about a common component and the same kind of component, and those overlapping description is abbreviate|omitted suitably.

Reference numeral 1 denotes a pressure spray type combustion apparatus 1 of the first embodiment, which heats a heat exchanger 21 provided at the bottom, and a burner body 20 is arranged downward in a burner case 30 .

The burner body 20 includes a fuel injection nozzle body 2 that injects fuel downward, a cylindrical rectifying cylinder 3 that has the nozzle body 2 at its center, a burner inner cylinder 8 that communicates below the rectifying cylinder 3, It has a spark plug (not shown).
The straightening cylinder 3 has a plurality of first air holes 10 in its peripheral wall, and serves as an introduction port of the mixed air of fuel and air injected from the nozzle body 2 into the burner inner cylinder 8 at the center of the bottom of the straightening cylinder 3 . It has an opening 14 and a first stabilizer 15 composed of radially cut swirl vanes.

Also, the burner inner cylinder 8 has a plurality of second air holes 12 in its peripheral wall.
A cylindrical heat shield plate 31 having an open top and forming a first air passage 6a with the burner inner cylinder 8 is provided on the outside of the burner inner cylinder 8 .

The burner case 30 includes a side plate portion 7 forming a second air passage 6b communicating with the first air passage 6a between the heat shield plate 31 and the heat shield plate 31 outside the heat shield plate 31, and a top plate covering the upper side of the side plate portion 7. and a bottom plate portion 32 that is connected to the lower portion of the burner inner cylinder 8 at a position facing the top plate portion 16 and to the lower portion of the heat shield plate 31 .

The nozzle body 2 and the straightening tube 3 are fixed to the top plate portion 16 . 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 .

A blower 9 is attached to the top plate portion 16 of the burner case 30 and blows air into the burner case 30 . The top plate part 16 is provided with an air blowing port 9a which is opened at a mounting part of the blower 9 and takes in air from the blower 9. - 特許庁

Reference numeral 40 denotes a wind direction member 40 provided in the vicinity of the blower port 9a in the burner case 30. As shown in FIG.

The airflow direction member 40 includes an airflow direction portion 41 that changes the direction of a portion of the air from the blower 9, and a first airflow direction portion 41 that fixes the airflow direction portion 41 and the burner case 30 and defines a predetermined space between the airflow direction portion 41 and the air blowing port 9a. and a proximal end 42 fixed at a distance d of .

The wind direction part 41 is located above the upper end of the heat shield plate 31 and is a plane perpendicular to the direction of the wind from the blower 9. cover only part of the
As a result, a branch path is formed that divides the air from the blower 9 into the air that collides with the airflow direction member 40 and changes direction and the air that advances without changing its direction due to the airflow direction member 40 .

Furthermore, the air whose direction is changed by the airflow direction member 40 spreads substantially radially along the surface of the airflow direction portion 41, and part of the air is located above the upper end portion of the heat shield plate 31 in the airflow direction portion 41. , advances to the rectifying tube 3 inside the heat shield plate 31 , and the others advance toward the side plate portion 7 .
As a result, the air from the blower 9 is blown in a first wind direction toward the rectifying tube 3, in a second wind direction toward the inside of the second air passage 6b, and toward the side plate portion 7. A branch path is formed to blow air in the third wind direction.

Next, the combustion operation will be explained.

Part of the air that is blown into the burner case 30 from the blower 9 through the blowing port 9a collides with the airflow direction portion 41 and changes direction, and is then blown substantially radially. 3 and at least the side plate portion 7 in a third wind direction.
On the other hand, part of the air blown into the burner case 30 does not collide with the airflow direction portion 41 and is also blown into the second air passage 6b without passing through the airflow direction portion 41 in the second airflow direction. be done.

Of these, the air in the first wind direction blown toward the rectifying tube 3 cools the peripheral wall of the rectifying tube 3, passes through the first air holes 10, and is blown into the rectifying tube 3 as primary air. . The primary air is blown into the straightening tube 3 and cools the nozzle body 2 with relatively cool air from the blower 9 .
Oil droplets injected from the nozzle body 2 form mixed air with the primary air, are ignited by discharge of a spark plug (not shown), pass through the opening 14, and form a downward flame in the burner inner cylinder 8. .

On the other hand, the air blown into the second air passage 6b in the second direction passes through the surface of the bottom plate portion 32 of the burner case 30 and cools the bottom plate portion 32, the side plate portion 7, and the heat shield plate 31. Then, the air passes through the upper part of the heat shield plate 31 and is blown into the peripheral wall of the rectifying tube 3 and the inside of the first air passage 6a as primary air and secondary air.

On the other hand, the air blown toward the side plate portion 7 in the third wind direction passes through the surface of the side plate portion 7 of the burner case 30, cools the side plate portion 7 and the heat shield plate 31, and is blown in the second wind direction. The air is blown as primary air and secondary air.

A part of the air blown into the first air passage 6a by the blower 9 passes through the second air hole 12 and joins the flame inside the burner inner cylinder 8 . As a result, the flame formed in the burner inner cylinder 8 is mixed with the secondary air, and the generation of carbon monoxide and soot due to incomplete combustion is suppressed.

As described above, the airflow direction member 40 is provided near the airflow port 9a, the airflow direction portion 41 is positioned above the upper end of the heat shield plate 31, and when the inside of the burner case 30 is viewed from the airflow port 9a, the opening area of the airflow port 9a is Since it is configured to cover only a part of the nozzle body 2, relatively cold air from the blower 9 can be blown as primary air to the nozzle body 2 inside the rectifying tube 3 with a simple configuration, and heat dissipation of the nozzle body 2 can be performed. can be promoted to suppress the generation of tar in the nozzle body 2, and relatively cold air from the blower 9 can be blown toward the inside of the second air passage 6b, and the burner case 30 can be can be effectively cooled. As a result, it is possible to achieve both cooling of the nozzle body 2 and cooling of the burner case 30 without changing the total amount of combustion air, that is, without deteriorating the combustion performance, thereby stabilizing the flame of the combustion device 1. It is something that can be planned.

It should be noted that other configurations used in the present embodiment are presented as an example, and are not intended to limit the scope of the invention, and can be implemented in various other forms. Various omissions, replacements, and changes can be made without departing from the scope of the description. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

Reference Signs List 1: Combustion device 2: Nozzle body 3: Rectifying tube 6a: First air passage 6b: Second air passage 7: Side plate portion 8: Burner inner cylinder 9: Blower 10: First air hole 12: Second air hole 16: Top plate part 20: Burner main body 30: Burner case 31: Heat shield plate 32: Bottom plate part 40: Wind direction member 41: Wind direction part 42: Base end part d: First distance

Claims (1)

A cylindrical rectifying cylinder having a nozzle body for fuel injection inside and having a plurality of air holes in the peripheral wall;
a burner inner cylinder that communicates with the rectifying cylinder below;
a heat shield plate forming a first air passage between the burner inner cylinder and the burner inner cylinder outside the burner inner cylinder;
a burner case that surrounds the heat shield;
with
The burner case is
a side plate portion forming a second air passage communicating with the first air passage between the heat shield plate and the heat shield plate outside the heat shield plate;
a top plate portion covering above the side plate portion;
a bottom plate portion that is connected to a lower portion of the burner inner cylinder at a position facing the top plate portion and is connected to a lower portion of the heat shield plate;
with
a blower attached to the top plate portion of the burner case;
a blower port opened in a mounting portion of the blower in the top plate;
further comprising
A wind direction member is attached in the vicinity of the air blow port in the burner case,
The wind direction member is
an airflow direction unit that changes the direction of part of the air from the blower;
a base end portion that fixes the wind direction portion and the burner case and fixes the distance between the wind direction portion and the blower port to a first distance;
with
The wind direction part is
Located above the upper end of the heat shield plate,
Having a plane perpendicular to the wind direction from the blower,
When the inside of the burner case is viewed from the air blow port, only a part of the opening area of the air blow port is covered,
The air blown into the burner case from the blower through the blowing port is
a first airflow direction blown toward the rectifying tube by the airflow direction section;
a second wind direction in which air is blown into the second air passage without passing through the wind direction portion;
A combustion device, wherein the airflow direction section blows air in a third airflow direction toward the side plate section.

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