JP3627514B2 - Combustion equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot water heater and a heater used at home, and more particularly to a combustion apparatus.
[0002]
[Prior art]
Conventional combustion apparatuses of this type are generally those described in Japanese Patent Laid-Open No. 4-131633. As shown in FIG. 7, this combustion apparatus has a carburetor 3 in which liquid fuel is ejected from a nozzle 1 and an electric heater 2 is embedded, and primary air provided for introducing combustion air into the carburetor 3. A passage 4, a mixing chamber 5 for uniformly mixing the combustible mixture mixed with the fuel vaporized in the carburetor 3, a flame port 6 provided at the upper portion of the mixing chamber 5, A secondary air passage 7 provided in the vicinity, and an end of the secondary air passage 7 is provided so as to surround the vaporizer 3, the mixing chamber 5, and the flame outlet 6. A part of the air passage 8 configured to open is opened to penetrate the side wall 9. Reference numeral 10 denotes a gap formed during assembly.
[0003]
Then, the liquid fuel is sent out as droplets from the nozzle 1 to the vaporizer 3 in which the electric heater 2 is embedded, and is heated and vaporized. On the other hand, a part of the combustion air is introduced into the carburetor 3 from the primary air passage 4 and mixed with the vaporized fuel to become a combustible air-fuel mixture. After being uniformly mixed in the mixing chamber 5, the flame outlet 6 A blue flame is formed and burned. On the other hand, the remaining air was supplied from the secondary air passage 7 to the flame outlet 6 and contributed to combustion.
[0004]
[Problems to be solved by the invention]
However, in the conventional combustion apparatus, since the secondary air passage 7 is opened to the air passage 8 so as to penetrate the side wall 9, an assembly gap 10 is formed in the secondary air passage 7 and the side wall 9. There was a problem that the secondary air of the part blows out laterally toward the flame opening 6 to inhibit the formation of blue flame and generate carbon monoxide and an irritating odor. Further, supplementing the clearance 10 with a sealing material such as putty or packing has a problem of increasing man-hours and material costs.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention is configured to cap a portion of the secondary air that blows out toward the flame opening when the end of the secondary air passage passes through the side wall and faces the air passage side. Is provided.
[0006]
According to the above invention, since the secondary air is prevented from being blown out from the secondary air passage and the side wall clearance of the portion communicating with the air passage of the secondary air passage toward the flame opening, the formation of blue flame is inhibited. No deterioration of exhaust gas characteristics can be prevented.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The combustion apparatus according to claim 1 of the present invention is provided with a through hole provided in a portion communicating with the air passage side of the secondary air passage, and inserted between the through hole and provided between the flame opening and the air passage. It has an insertion part constituted by a part of the side wall.
[0008]
And, in order to prevent the secondary air from blowing from the gap where the insertion portion communicates with the air passage of the secondary air passage toward the flame outlet, the blue flame is prevented from being blown away, and the exhaust gas characteristics are deteriorated. Can be prevented.
[0009]
The combustion apparatus according to claim 2 of the present invention has an enlarged portion in a portion communicating with the air passage side of the secondary air passage.
[0010]
And since an expansion part eliminates a clearance and prevents blowing out of the secondary air of the horizontal direction toward a flame opening, it can prevent blowing off of a blue flame and can prevent deterioration of exhaust gas characteristics.
[0011]
A combustion apparatus according to a third aspect of the present invention has a receiving portion provided in order to insert the end portion of the secondary air passage into a side wall provided between the flame port and the air passage.
[0012]
And since a receiving part eliminates a clearance and prevents blowing out of the secondary air of the horizontal direction toward a flame opening, it can prevent blowing off of a blue flame and can prevent deterioration of exhaust gas characteristics.
[0013]
According to a fourth aspect of the present invention, there is provided a combustion apparatus comprising: a flange portion developed along a side wall provided between a flame port and an air passage at an end portion thereof which communicates with an air passage side of a secondary air passage; Have
[0014]
And since a flange part eliminates a clearance and prevents blowing out of the secondary air of the horizontal direction toward a flame opening, it can prevent blowing off of a blue flame and can prevent deterioration of exhaust gas characteristics.
[0015]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0016]
(Example 1)
FIG. 1 is a cross-sectional view showing a main part of a combustion apparatus according to a first embodiment of the present invention. FIGS. 2 and 3 are enlarged cross-sectional views showing a main part of the combustion apparatus.
[0017]
In FIG. 1 and FIG. 2, kerosene as liquid fuel is sucked up from a fuel tank (not shown) to a fuel pump 11 as fuel supply means and supplied to a fuel supply nozzle 13 through an oil feed pipe 12. Reference numeral 14 denotes a cylindrical vaporizer provided in front of the fuel supply nozzle 13 and made of a material having good heat conductivity such as aluminum, brass, copper, and iron, and an electric heater 15 is embedded therein. A carburetor lid 17 is provided on the side of the carburetor 14 so that the end of the blower pipe 16 faces. The fuel supply nozzle 13 is inserted into the blower pipe 15 toward the vaporizer 14. At the lower part of the vaporizer 14, there is provided an air-fuel mixture outlet 18 constituted by a vaporizer lid 17, and below that is a bowl-like shape made of a material having good heat conductivity such as aluminum, brass, copper, iron or the like. A mixing passage 19 is provided. Downstream of the mixing passage 19, a plurality of porous flame ports 20 made of a heat-resistant material such as steel, iron, titanium, duralumin, and ceramic are provided. Reference numeral 21 denotes a burner case that covers the entire combustion portion, and an inner space is an air passage 22 provided so as to surround the vaporizer 14, the mixing passage 19, and the flame outlet 20. Reference numeral 23 denotes a cylindrical secondary air passage having a large number of secondary air ejection holes 24 formed on the upper surface. A plurality of secondary air passages 23 are alternately arranged with the flame port 20 so as to supply air near the flame port 20. Reference numeral 25 denotes a side wall provided between the flame opening 20 and the air passage 22, and a combustion chamber 26 is formed inside thereof. The end of the secondary air passage 23 is opened to the air passage 22 side through the side wall 25. 27 is a through hole provided in the vicinity of the end of the secondary air passage 23 toward the downstream side of the flame opening 20, and an insertion portion 28 constituted by a part of the side wall 25 is inserted therein. The side wall 25 is provided with as many comb-blade slits as the number of secondary air passages 23 from the side of the mixing passage 19, and the secondary air passages 23 are inserted into the slits so as to be sandwiched between the side walls 25 and the mixing passage 19. Has been done. Thus, the secondary air passage 23 and the side wall 25 are positioned and assembled. The through hole 27 and the insertion portion 28 are provided for each secondary air passage 23. As shown in FIG. 3A, the through-hole 27 is inserted when the insertion portion 28 is inserted from the downstream side of the flame opening 20 beyond the thickness of the flame opening 20 or the secondary air passage 23, or as shown in FIG. ), The case where it is inserted from the side of the secondary air passage 23 more than the plate thickness is conceivable. In this case, a notch portion 29 is provided in the insertion portion 28 to reduce the passage resistance of the secondary air passage 23. The end of the mixing passage side 19 is attached to a part of the secondary air passage 23 and a plurality of spot welds. Reference numeral 30 denotes a fin-shaped heat receiving portion formed on the back surface of the vaporizer 14 so as to protrude into the combustion chamber 26. 31 is a heat exchanger mounted on the top plate portion 32 of the air passage 22 so as to cover the top of the flame opening 20. Reference numeral 33 denotes a blower for supplying combustion air. The impeller uses a turbo fan, a radial fan, or the like that can generate high pressure, and is rotated by a motor, and is communicated with a part of the side of the air passage 22. The air passage 34 is connected. Inside the air passage 34, the air duct 16 is provided. Reference numeral 35 denotes a blue flame formed on the flame outlet 20.
[0018]
Next, the operation and action will be described. When a power source (not shown) is turned on, the electric heater 15 is energized and the vaporizer 14 is heated. When the vaporizer 14 reaches a predetermined temperature, the blower 33 is activated, and combustion air is supplied. The air supplied to the blower passage 34 is divided into primary air supplied into the blower pipe 16 and secondary air supplied into the secondary air passage 23. At the same time, the fuel pump 11 is operated, and fuel is sprayed from the fuel supply nozzle 13 to the vaporizer 14. The fuel is vaporized on the wall surface of the high-temperature carburetor 14, transported to the mixing passage 19 while being mixed with the primary air, and becomes a combustible air-fuel mixture and is ejected from the flame outlet 20. At this time, the combustible air-fuel mixture is ignited by the discharge of an igniter (not shown) and combustion starts. Further, since the secondary air passes through the air passage 22 inside the burner case 21 and is supplied to the secondary air jet outlet 24 disposed in the vicinity of the flame outlet 20 through the secondary air passage 23, the inside of the combustion chamber 26 The combustion of the blue flame 35 is promoted. The high-temperature combustion gas generated by the combustion is heat-exchanged by the heat exchanger 31 and discharged. The secondary air flowing into the secondary air passage 23 is blocked by the insertion portion 28 inserted into the through hole 27, and is laterally directed from the portion communicating with the air passage 22 of the secondary air passage 23 toward the flame port 20. Since the secondary air in the direction is prevented from being blown out, the blue flame 35 can be prevented from being blown out, and the deterioration of the exhaust gas characteristics such as the generation of carbon monoxide and an irritating odor can be prevented. Further, since the insertion portion 28 is inserted into the flame opening 20 from the downstream side of the flame opening 20, even if a gap occurs in the through hole 27 and the insertion portion 28, the secondary air flows along the flame opening 20. Since the secondary air is blown out to the downstream side of 20, there is no blowing of secondary air in the lateral direction toward the flame opening 20, and deterioration of exhaust gas characteristics can be prevented without disturbing the blue flame 35.
[0019]
Further, as shown in FIG. 3B, the notch portion 29 is provided in the insertion portion 28 to reduce the passage resistance of the secondary air passage 23, so that the secondary air is not hindered. It is possible to prevent the secondary air from blowing out in the lateral direction toward the flame opening 20 over a wide range around the passage 23, and to prevent the deterioration of the exhaust gas characteristics. Further, even if a gap occurs in the through hole 27 and the insertion portion 28, it is possible to prevent the deterioration of the exhaust gas characteristics without disturbing the blue flame 35. Therefore, there is a margin in tolerance when the secondary air passage 23 and the side wall 25 are assembled. And can be easily assembled. Further, it is not necessary to supplement the clearance with a sealing material such as putty or packing, and an increase in man-hours and material costs can be prevented.
[0020]
(Example 2)
FIG. 4 is an enlarged cross-sectional view showing a main part of the combustion apparatus according to the second embodiment.
[0021]
In the present embodiment, the difference from the first embodiment is that the secondary air passage 23 is inserted into the communication port 36 provided in the side wall 25, the end portion thereof is expanded and formed, and the enlarged portion 37 is provided on the air passage 22 side. That is.
[0022]
In addition, the thing of the same code | symbol as Example 1 has the same structure, and abbreviate | omits description.
Next, the operation and action will be described. The enlarged portion 37 that expands the end of the secondary air passage 23 presses the passage wall of the secondary air passage 23 to the full communication port 36 to eliminate the clearance, and the secondary air passage. Since the secondary air in the lateral direction from the communication port 36 communicating with the air passage 22 to the flame port 20 is prevented from being blown out, the blowout of the blue flame 35 is more reliably prevented and the exhaust gas characteristics are deteriorated. Can be prevented. Further, since the secondary air passage 23 and the side wall 25 are fixed by the enlarged portion 37, the secondary air passage 23 can be reliably mounted. In addition, since a plurality of loosely intersecting communication ports 36 are provided in the side wall 25 and the secondary air passage 23 is inserted into the side wall 25 and the end portion is expanded, the operation is easy and the increase in cost can be prevented. Further, when the side wall 25 is provided with comb blade-like slits from the side of the mixing passage 19 as many as the number of the secondary air passages 23, the secondary air passages 23 are inserted into the slits and sandwiched between the side walls 25 and the mixing passage 19 for mounting. In this case, since the enlarged portion 37 is provided on the downstream side of the flame opening 20, it is possible to prevent the secondary air from blowing out in the lateral direction toward the flame opening 20. In this embodiment, the enlarged portion 37 is provided on the air passage 22 side, but the same effect can be obtained by expanding the secondary air passage 23 on the flame outlet 20 side.
[0023]
(Example 3)
FIG. 5 is an enlarged cross-sectional view showing a main part of the combustion apparatus according to the third embodiment.
[0024]
In this embodiment, the difference from Embodiment 1 (or 2) is that burring, curling, and the like for inserting the end of the secondary air passage 23 into the side wall 25 provided between the flame opening 20 and the air passage 22. This is to provide a receiving portion 38 having a protruding shape such as a bud.
[0025]
In addition, the thing of the same code | symbol as Example 1 has the same structure, and abbreviate | omits description.
Next, the operation and action will be described. Since the secondary air passage 23 is closely inserted, for example, press-fitted into the protruding receiving portion 38 that matches the cross-sectional shape of the secondary air passage 23, the clearance at the time of assembly is reduced. Since the secondary air in the lateral direction from the receiving portion 38 communicating with the air passage 22 of the secondary air passage 23 to the flame outlet 20 is prevented from being blown out, the blue flame 35 is prevented from being blown out and the exhaust gas is discharged. The deterioration of the characteristics can be prevented. Further, since the secondary air passage 23 and the side wall 25 are fixed by the receiving portion 38, the attachment of the secondary air passage 23 can be performed reliably. Further, the projection-shaped receiving portion 38 forms irregularities on the planar side wall 25 and reinforces it, so that thermal deformation of the side wall 25 can be prevented.
[0026]
(Example 4)
FIG. 6 is an enlarged cross-sectional view showing a main part of a combustion apparatus according to a fourth embodiment.
[0027]
In the present embodiment, the difference from the first embodiment (or 2 or 3) is that the end portion of the secondary air passage 23 passes through the side wall 25 provided between the flame port 20 and the air passage 22 and the end portion thereof. The flange portion 39 is provided so as to extend along the side wall 25 on the air passage 22 side.
[0028]
In addition, the thing of the same code | symbol as Example 1 has the same structure, and abbreviate | omits description.
Next, the operation and action will be described. Since the flange portion 39 larger than the communication port 36 is provided along the side wall 25 of the secondary air passage 23 on the air passage 22 side, the gap at the time of assembly is blocked, Since the secondary air is prevented from being blown out in the lateral direction from the communication port 36 communicating with the air passage 22 of the secondary air passage 23 toward the flame port 20, the blowout of the blue flame 35 is prevented and the exhaust gas characteristics are deteriorated. Can be prevented. Further, since the secondary air passage 23 and the side wall 25 are caulked and fixed by the flange portion 39, the mounting of the secondary air passage 23 can be performed reliably. In addition, a plurality of loosely intersecting communication ports 36 are provided in the side wall 25, and the secondary air passage 23 is inserted into the side wall 25 so that the flange portion 39 is developed at the end portion.
[0029]
【The invention's effect】
As described above, according to the combustion apparatus of the first aspect of the present invention, the secondary air flowing into the secondary air passage is blocked by the insertion portion inserted into the through hole, and therefore toward the flame opening. The secondary air in the horizontal direction is prevented from being blown out, and the blue flame is prevented from being blown out, and the exhaust gas characteristics can be prevented from deteriorating. In addition, since the deterioration of the exhaust gas characteristics can be prevented without disturbing the blue flame, there is an effect that a tolerance can be given when the secondary air passage and the side wall are assembled, and the assembly can be easily performed. Further, it is not necessary to supplement the clearance with a sealing material such as putty or packing, and it is possible to prevent an increase in man-hours and material costs.
[0030]
Further, according to the combustion apparatus of the second aspect, since the gap between the secondary air passage and the side wall is eliminated by the enlarged portion obtained by expanding the end portion of the secondary air passage, 2 in the lateral direction toward the flame opening. The secondary air is prevented from being blown out, and there is an effect that the blue flame can be prevented from being blown out and the exhaust gas characteristics can be prevented from deteriorating. In addition, since the secondary air passage and the side wall are fixed by the enlarged portion, there is an effect that the secondary air passage can be reliably mounted.
[0031]
According to the combustion apparatus of the third aspect, since the secondary air passage is inserted almost densely into the protruding receiving portion, the clearance at the time of assembly is eliminated and the secondary air passage communicates with the air passage of the secondary air passage. The secondary air is prevented from blowing out in the lateral direction from the communicating port toward the flame port, and there is an effect that it is possible to prevent the blue flame from blowing out and to prevent the deterioration of the exhaust gas characteristics. Further, since the secondary air passage and the side wall are fixed by the receiving portion, there is an effect that the secondary air passage can be reliably mounted. Further, since the side walls are reinforced by the protruding receiving portions, there is an effect that thermal deformation of the side walls can be prevented.
[0032]
According to the combustion apparatus of the fourth aspect, since the flange portion is provided along the side wall at the end of the secondary air passage on the air passage side, the clearance at the time of assembly is closed, and the flame outlet Since the secondary air is prevented from being blown out in the horizontal direction toward the surface, there is an effect that it is possible to prevent the blue flame from being blown out and to prevent the deterioration of the exhaust gas characteristics.
[0033]
Further, since the secondary air passage and the side wall are fixed by the flange portion, there is an effect that the secondary air passage can be reliably mounted.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of main parts of a combustion apparatus according to Embodiment 1 of the present invention. FIG. 2 is an enlarged cross-sectional view of main parts of the combustion apparatus. FIG. 5 is an enlarged cross-sectional view of the main part of the combustion apparatus in Example 2 of the present invention. FIG. 5 is an enlarged cross-sectional view of the main part of the combustion apparatus in Example 3 of the present invention. Fig. 7 is a sectional view of the main part of a conventional combustion apparatus.
14 Vaporizer 19 Mixing passage 20 Flame port 22 Air passage 23 Secondary air passage 25 Side wall 27 Through-hole 28 Insertion part

Claims (4)

A vaporizer for vaporizing liquid fuel, a mixing passage communicating with a part of the vaporizer, a porous flame port disposed downstream of the mixing passage, and provided so as to surround at least the periphery of the mixing passage Provided in the vicinity of the flame opening, one end of which communicates with the air passage, and a portion of the secondary air passage that communicates with the air passage side. A combustion apparatus comprising a hole and an insertion portion which is inserted into the through hole and is configured by a part of a side wall provided between the flame opening and the air passage. A vaporizer for vaporizing liquid fuel, a mixing passage communicating with a part of the vaporizer, a porous flame port disposed downstream of the mixing passage, and provided so as to surround at least the periphery of the mixing passage An air passage provided in the vicinity of the flame opening, a secondary air passage having one end thereof communicated with the air passage, and an enlarged portion provided in a portion communicating with the air passage side of the secondary air passage. Combustion device consisting of A vaporizer for vaporizing liquid fuel, a mixing passage communicating with a part of the vaporizer, a porous flame port disposed downstream of the mixing passage, and provided so as to surround at least the periphery of the mixing passage The secondary air is provided in the vicinity of the air passage, the secondary air passage provided at one end of the air passage, the end of the air passage being connected to the air passage, and the side wall provided between the flame mouth and the air passage. A combustion apparatus comprising a receiving portion provided to insert the end portion of the passage substantially densely. A vaporizer for vaporizing liquid fuel, a mixing passage communicating with a part of the vaporizer, a porous flame port disposed downstream of the mixing passage, and provided so as to surround at least the periphery of the mixing passage The air passage formed in the vicinity of the flame opening, a secondary air passage having one end thereof communicated with the air passage, and a side wall provided between the flame opening and the air passage. The combustion apparatus which consists of the flange part expand | deployed to the said air path side from the edge part of the next air path.

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