Combustion equipment

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

[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. Some gun-type burners supply primary air near a nozzle that injects fuel, thereby allowing the fuel and air to be mixed appropriately and thereby generating a stable flame. For example, the one described in Patent Document 1 is known.

[0003] As shown in FIG. 4, in the conventional combustion device 100 of Patent Document 1, fuel injected from a fuel injection nozzle 107 is mixed with air from a blower 101, ignited by an ignition plug 108, and combusted mainly in a combustion liner 106.

[0004] Air that enters the inside of the nozzle accommodating inner cylinder 103a through air holes 110 provided on the side surface of the nozzle accommodating inner cylinder 103a passes around the fuel injection nozzle 107 and is sent into the combustion cylinder 106 together with the fuel.

[0005] The air introduced from the blower 101 into the burner case 102 swirls inside the burner case 102, cooling the bottom and side walls of the burner case 102, and then enters the nozzle storage inner cylinder 103a to become primary air, which cools the fuel injection nozzle 107 that has received radiant heat. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 11-182813 Summary of the Invention [Problem to be solved by the invention]

[0007] However, since the air itself is warmed by the heat of combustion as it swirls inside the burner case 102, the air that enters the inside of the nozzle storage inner cylinder 103a may have a reduced effect of cooling the fuel injection nozzle 107 exposed to radiant heat.

[0008] If the heat dissipation of the fuel injection nozzle 107 is hindered, the temperature of the fuel injection nozzle 107 will rise, accelerating the oxidation of the kerosene and producing tar, which may narrow the nozzle hole of the fuel injection nozzle 107 and cause the flame to become unstable.

[0009] The present invention has been made in consideration of the above background, and aims to provide a combustion device that can distribute the airflow introduced from a blower using only simple components, thereby stabilizing the flame of the combustion device. [Means for solving the problem]

[0010] The present invention has been made to achieve the above object, and in claim 1, there is provided a method for producing a burner case comprising: a cylindrical straightening cylinder having a nozzle body for fuel injection inside and a plurality of air holes in a peripheral wall; a burner inner cylinder communicating below the straightening cylinder; a heat shield plate on the outside of the burner inner cylinder that forms a first air passage between the burner inner cylinder and the heat shield plate; and a burner case covering the periphery of the heat shield plate, the burner case comprising: a side plate portion on the outside of the heat shield plate that forms a second air passage between the heat shield plate and the first air passage; a top plate portion covering an upper part of the side plate portion; and a bottom plate portion connected to a lower part of the burner inner cylinder at a position opposite to the top plate portion and connected to a lower part of the heat shield plate; and further comprising: a blower attached to the top plate portion of the burner case; and an air outlet opened to an attachment portion of the blower in the top plate portion, The present invention is characterized in that an air direction member is attached near the air outlet in the burner case, and the air direction member has an air direction section that changes the direction of a portion of the air from the blower, and a base end section that fixes the air direction section to the burner case and fixes a first distance between the air direction section and the air outlet, the air direction section is located above the upper end section of the heat shield plate, has a plane perpendicular to the air direction from the blower, and covers only a portion of the opening area of ​​the air outlet when viewed from the air outlet into the burner case, and the air blown from the blower through the air outlet into the burner case is blown in a first air direction by the air direction section toward the straightening tube, a second air direction by the air direction section toward the second air passage without passing through the air direction section, and a third air direction by the air direction section toward the side panel section. Effect of the Invention

[0011] According to this invention, the direction of the air introduced from the blower can be distributed using only simple components, thereby stabilizing the flame of the combustion device. [Brief description of the drawings]

[0012] [Figure 1] 1 is a schematic diagram of a combustion device according to a first embodiment of the present invention; [Diagram 2]1 is a view of a combustion apparatus according to a first embodiment of the present invention taken along an arrow A; [Diagram 3] FIG. 1 is a perspective view illustrating an air flow in a combustion device according to a first embodiment of the present invention. [Figure 4] Cross-sectional view of a prior art combustion device DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] A first embodiment of a combustion device 1 according to the present invention will be described with reference to Figures 1 to 3. In each figure, common components or similar components are denoted by the same reference numerals, and duplicated descriptions thereof will be omitted as appropriate.

[0014] 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.

[0015] The burner body 20 includes a fuel injection nozzle body 2 which injects fuel downward, a cylindrical straightening tube 3 with the nozzle body 2 at its center, a burner inner tube 8 which is connected to the lower part of the straightening tube 3, and an ignition plug (not shown). The straightening tube 3 has a plurality of first air holes 10 on its peripheral wall, and is provided with an opening 14 at the center of the bottom of the straightening tube 3 which serves as an inlet for the mixture of fuel and air injected from the nozzle body 2 into the burner inner tube 8, and a first stabilizer 15 consisting of radially cut swirl vanes.

[0016] Moreover, the burner inner cylinder 8 has a plurality of second air holes 12 on the peripheral wall. On the outside of the burner inner cylinder 8, a cylindrical heat shield plate 31 that is open at the top and forms a first air passage 6a between itself and the burner inner cylinder 8 is provided.

[0017] The burner case 30 comprises a side plate portion 7 which forms a second air passage 6b communicating with the first air passage 6a between the heat shield plate 31 and the side plate portion 7, a top plate portion 16 which covers the upper part of the side plate portion 7, and a bottom plate portion 32 which is connected to the lower part of the burner inner tube 8 at a position opposite the top plate portion 16 and is connected to the lower part of the heat shield plate 31.

[0018] 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.

[0019] 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.

[0020] Reference numeral 40 denotes a wind direction member 40 provided in the burner case 30 near the blower opening 9a.

[0021] The airflow direction member 40 includes an airflow direction section 41 that changes the direction of part of the air from the blower 9, and a base end section 42 that fixes the airflow direction section 41 to the burner case 30 and fixes the distance between the airflow direction section 41 and the air outlet 9a to a predetermined first distance d.

[0022] The airflow direction portion 41 is located above the upper end of the heat shield plate 31 and is a plane perpendicular to the direction of airflow from the blower 9. When facing the inside of the burner case 30 from the air outlet 9a, the airflow direction portion 41 covers only a portion of the opening area of ​​the air outlet 9a. This forms a branching path that divides the air from the blower 9 into air that collides with the air direction member 40 and changes direction, and air that proceeds without being changed direction by the air direction member 40.

[0023] Furthermore, the air that is redirected by the air direction member 40 spreads out approximately radially along the surface of the air direction portion 41, and part of the air proceeds to the straightening tube 3 inside the heat shield 31, since the air direction portion 41 is located above the upper end portion of the heat shield 31, while the other part proceeds toward the side plate portion 7. This forms branching paths that blow air from the blower 9 in a first direction toward the air straightening tube 3, a second direction toward the second air passage 6b, and a third direction toward the side panel portion 7.

[0024] Next, the combustion operation will be described.

[0025] A portion of the air blown from the blower 9 through the air outlet 9a into the burner case 30 collides with the air direction section 41, changes direction, and is then blown approximately radially, and a portion of the air is blown in a first air direction toward at least the air straightening tube 3, and a third air direction toward at least the side panel section 7. On the other hand, a part of the air blown into the burner case 30 does not collide with the air direction portion 41 and is also blown in a second air direction toward the second air passage 6b without passing through the air direction portion 41.

[0026] Of these, the air in the first wind direction sent toward 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 ignite by the discharge of an ignition plug (not shown), pass through the opening 14 and form a downward flame in the burner inner cylinder 8.

[0027] On the other hand, the air in the second direction blown toward the second air passage 6b passes over the surface of the bottom plate portion 32 of the burner case 30, cooling the bottom plate portion 32, the side plate portion 7 and the heat shield 31, and passes over the top of the heat shield 31 to be blown into the peripheral wall of the straightening tube 3 and into the first air passage 6a, where it is blown as primary air and secondary air.

[0028] On the other hand, the air of the third wind direction blown toward the side plate portion 7 passes through the surface of the side plate portion 7 of the burner case 30, cooling the side plate portion 7 and the heat shield plate 31, and is blown as primary air and secondary air together with the air of the second wind direction.

[0029] A part of the air sent into the first air passage 6a by the blower 9 passes through the second air hole 12 and merges with the flame in the burner inner cylinder 8. As a result, the flame formed in the burner inner cylinder 8 is mixed with the secondary air, suppressing the generation of carbon monoxide and soot due to incomplete combustion.

[0030] As described above, the airflow direction member 40 is provided near the air outlet 9a, and the airflow direction portion 41 is located above the upper end of the heat shield plate 31, and when the inside of the burner case 30 is viewed from the air outlet 9a, only a part of the opening area of ​​the air outlet 9a is covered. This allows the relatively cool air from the blower 9 to be blown as primary air to the nozzle body 2 inside the straightening tube 3 with a simple configuration, promoting heat dissipation from the nozzle body 2 and suppressing the generation of tar in the nozzle body 2, and also allows the relatively cool air from the blower 9 to be blown toward the second air passage 6b, effectively cooling the burner case 30. This allows both the cooling of the nozzle body 2 and the cooling of the burner case 30 to be achieved without changing the total amount of combustion air, that is, without deteriorating the combustion performance, and allows the flame of the combustion device 1 to be stabilized.

[0031] 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]

[0032] 1: Combustion equipment 2: Nozzle body 3: Rectifier tube 6a: First air passage 6b: Second air passage 7: Side plate part 8: Burner inner cylinder 9: Blower 10: First air vent 12: Second air vent 16: Top plate 20: Burner body 30: Burner case 31: Heat shield 32: Bottom plate part 40: Wind direction component 41: Wind direction part 42: Proximal end d: First distance

Claims

[Claim 1] a cylindrical straightening cylinder having a nozzle body for fuel injection on its inside and a plurality of air holes on its peripheral wall; A burner inner cylinder communicating below the straightening cylinder; a heat shield plate that is disposed outside the burner inner cylinder and that forms a first air passage between the burner inner cylinder and the heat shield plate; A burner case covering the periphery of the heat shield; Equipped with The burner case is a side plate portion that is disposed outside the heat shield plate and that defines a second air passage between the heat shield plate and the side plate and that communicates with the first air passage; 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 and connected to a lower portion of the heat shield plate; Equipped with A blower attached to the top plate portion of the burner case; an air outlet opening at a portion of the top plate where the air blower is attached; Further equipped with A wind direction member is attached in the burner case near the blower opening, The airflow direction member is A wind direction unit that changes the wind direction of a part of the air from the blower; A base end portion that fixes the airflow direction portion and the burner case and fixes a distance between the airflow direction portion and the air outlet at a first distance; Equipped with The wind direction unit is Located above the upper end of the heat shield, A plane perpendicular to the wind direction from the blower is provided, When the inside of the burner case is viewed from the blower port, only a part of the opening area of ​​the blower port is covered, The air blown from the blower through the blowing port into the burner case is a first airflow direction in which air is blown toward the air straightening cylinder by the airflow direction unit; a second airflow direction in which air is blown toward the second air passage without passing through the airflow direction portion; The air is blown in a third air direction by the air direction portion toward the side plate portion. A combustion device characterized by:

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