JP2814789B2 - Combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus in which a flame can be opposed to improve exhaust gas characteristics and expand a variable combustion range.

[0002]

2. Description of the Related Art Conventionally, this type of combustion apparatus has been configured as shown in FIGS. That is, in the figure, 31 is a fuel nozzle for ejecting fuel, 32 is a vaporizing cylinder for vaporizing the fuel, 33 is a heater for heating the vaporizing cylinder, 34 is a mixing chamber for mixing vaporized fuel and air, 35 is a fuel passage, 36 is a fuel supply passage branched from the fuel passage 35, 37 is a flame outlet, 38
Is a combustion chamber wall, 39 is a flame, and 40 is a combustion chamber. 41 is a side plate on the opposite side of the mixing chamber 34, 42 is a secondary air supply pipe,
The secondary air flows through a through hole 43 formed in the side plate 41. Reference numeral 44 denotes a burner cover that covers the outside of the fuel passage 35, and a space between the burner cover 44 and the fuel passage 35 is a secondary air chamber 45. Reference numeral 46 denotes a cover for covering between the burner cover 44 and the combustion chamber wall 38. The cover 46 has a secondary air supply port 47 formed therein. A supply gap 48 is formed.

[0003] The operation of the combustion apparatus configured as described above will be described below. First, the heater 33
When the vaporization cylinder 32 reaches a predetermined temperature, combustion air and liquid fuel are sent into the vaporization cylinder 32, and the liquid fuel is vaporized by the vaporization cylinder 32, and is mixed with the air to the mixing chamber 34. The air and the vaporized fuel are sufficiently mixed in the mixing chamber 34. The mixed gas mixture passes through the fuel passage 35 and reaches the flame port 37 from a number of fuel supply passages 36.
When the air-fuel mixture ejected from the flame port 37 is ignited, the flame 39
Is formed, and the secondary air is supplied from the secondary air port 47 during strong combustion and from the gap 48 during weak combustion, and is combusted. Here, since the flame ports 37 are provided to face each other, the flames 39 are formed to face each other. As a result, even when the amount of air increases or the amount of combustion is large, it is difficult for the flame to blow off, and the variable range of the amount of air and the amount of combustion is widened.

[0004]

However, in the conventional combustion apparatus described above, if used for a long period of time, the airtightness of the contact portion between the vaporizing cylinder and the combustion chamber deteriorates, and incomplete combustion into the chamber from this part. There is a problem that the combustion gas in the state, that is, carbon monoxide leaks. The present invention has been made to solve such a problem, and has as its object to prevent leakage of carbon monoxide even when used for a long time.

[0005]

In order to achieve the above object, the present invention forms a combustion chamber by opposing two combustion chamber walls having a large number of flame openings, and a burner cover is provided outside the combustion chamber wall. A lower portion of the burner cover and a lower portion of the combustion chamber wall.
And a secondary space between the burner cover and the combustion chamber wall.
Burnayu having an air chamber and opening the lower part of the combustion chamber
Form a knit and open the lower combustion chamber of this burner unit
The upper surface portion disposed vaporization cylinder covered with a lid of this vaporization tube
Lid outer periphery and combustion chamber lower opening edge of the burner cover
And the lower opening of the combustion chamber is closed with this vaporizing cylinder, and a secondary air hole is formed between the contact portion between the vaporizing cylinder and the burner case and the lowermost flame port of each combustion chamber wall. It has a lined configuration.

[0006]

According to the present invention, even if the airtightness of the contact portion between the vaporizing cylinder and the combustion chamber deteriorates due to long-term use, the combustion gas in an incomplete combustion state from this portion into the chamber can be obtained. That is, leakage of carbon monoxide can be prevented.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 1 is a vaporization cylinder for vaporizing liquid fuel,
The upper surface is closed by a lid 1a via a packing 1b. Reference numeral 2 denotes a fuel nozzle for ejecting liquid fuel to the vaporizing cylinder 1 and is connected to a pump. Reference numeral 3 denotes an air passage for guiding the combustion air from the blower to the vaporizing cylinder 1, and is open to the inlet of the vaporizing cylinder 1 together with the fuel nozzle 2. Reference numeral 4 denotes a mixing chamber provided at the outlet of the vaporizing cylinder 1 and communicates with the fuel passages 5 on both sides. A large number of fuel supply passages 6 are branched from the fuel passage 5, and the other end of the fuel supply passage 6 penetrates through the combustion chamber wall 7 and opens into the combustion chamber 8 to form a flame port 9. Here, the two combustion chamber walls 7 face each other, and the flame ports 9 are provided at positions facing each other. Numeral 10 denotes a flame formed in the flame port 9, and the flames 10 from both sides are opposed to each other. The fuel passage 5, the fuel supply passage 6, and the combustion chamber wall 7 are formed by a burner body 11 formed by bending a single sheet metal, and a plurality of the burner bodies 11 are connected. A flange 7a is formed at an upper end of the combustion chamber wall 7 by bending outward. 1
Reference numeral 2 denotes a side plate that fixes the burner body 11 and the vaporizing cylinder 1 on the opposite side of the mixing chamber 4, and reference numeral 13 denotes a secondary air supply pipe between the burner bodies 11 through a through hole 14 formed in the side plate 12. The secondary air is caused to flow through the air section. Reference numeral 15 denotes a burner cover which covers the outside of the fuel passage 5 of the burner body 11, and a space between the burner bodies is a secondary air chamber 16. Reference numeral 17 denotes a cover for covering between the burner cover 15 and the combustion chamber wall 7. The cover 17 has a large number of secondary air holes 18, and the lower end 17b of the cover 17 is provided with a flange 7a at the upper end of the combustion chamber wall 7.
It is arranged so as to form a constant gap 19 thereon. 20
Is a heat shield plate attached to the upper end of the combustion chamber wall 7 by spot welding or the like, forms a cooling gap 22 with the cover 17, and has a lower portion below the optimum secondary air amount during weak combustion. A large number of through-holes 23 each having an area set to supply the pressure are formed.

The burner cover 15 has an upper end screwed to the cover 17 and a lower end crimped to the lower end of the combustion chamber wall 7 to integrate these components including the burner body 11 to form a burner unit 24. doing. Then, the lower surface of the burner cover 15 is attached to the upper flange 1 of the vaporizing cylinder 1.
The burner unit 24 and the vaporizing cylinder 1 are integrated with each other by screwing to the c through a packing 25. Also, a number of secondary air holes 26 are formed in a horizontal row below the lowermost flame port 9a of the combustion chamber wall 7.

Reference numeral 27 denotes an ignition electrode for igniting the air-fuel mixture, and reference numeral 28 denotes a heater embedded in the vaporizing cylinder 1.

[0010] The operation of the combustion apparatus configured as described above will be described below. First, the heater 28 is energized to heat the vaporizing cylinder 1. When the temperature of the vaporizing cylinder 1 reaches a predetermined temperature, the blower is operated, and combustion air is sent to the vaporizing cylinder 1 through the air passage 3. In addition, the pump also operates, and fuel is ejected from the fuel nozzle 2 into the vaporization cylinder 1. Vaporization cylinder 1
Since the temperature is at a temperature at which the liquid fuel is vaporized, the fuel is vaporized and guided from the outlet of the vaporizing cylinder 1 to the mixing chamber 4 while being mixed with the combustion air as indicated by the dashed arrow in FIG.
In the mixing chamber 4, the fuel and air flow into the fuel passage 5 as a uniformly mixed air-fuel mixture. Further, the air-fuel mixture proceeds to the fuel supply passage 6 branched from the fuel passage 5 in large numbers, and when the air-fuel mixture coming out of the opening of the combustion supply passage 6, that is, the flame opening 9 is ignited by the ignition electrode 27, a flame 10 is formed and combustion To continue. At this time, as indicated by a solid arrow in FIG. 4, the secondary air supplied from the secondary air supply pipe enters the combustion chamber through the secondary air chamber 16 through the secondary air hole 26, and enters the lowermost stage in the combustion chamber. A layer of secondary air is formed below the flame outlet.

Therefore, when the combustion device is used for a long period of time, the packing 25 is gradually deteriorated after a certain period of use, or a gap is formed between the vaporizing cylinder 1 and the burner cover 15 without mounting the packing 25. Also in this case, the layer of the secondary air completely burns the incompletely combusted gas existing near the gap, that is, carbon monoxide, from the lower portion in the combustion chamber, and furthermore, the inside of the combustion chamber and the vaporizer cylinder 1 and the burner cover. 15 prevents the gas in the incompletely combusted state from leaking into the room and the outside which is communicated through the gap between the room 15 and the room, thereby ensuring the safety of the room and greatly improving the durability of the combustion device. ing.

When using this combustion device for a long time,
The packing 1b that fills the gap between the vaporizing cylinder 1 and the lid 1a over a certain period of time gradually deteriorates, or the air-fuel mixture in the vaporizing cylinder 1 is removed from the gap between the vaporizing cylinder 1 and the lid 1a without installing the packing 1b. Even when the secondary air layer leaks to the bottom of the combustion chamber 8, the secondary air layer completely burns the air-fuel mixture leaked into the combustion chamber, and the external air that passes through the gap between the vaporizing cylinder 1 and the burner cover 15 in the combustion chamber. This prevents the air-fuel mixture from leaking into the room, secures the safety of the room, and greatly enhances the durability of the combustion device.

Although the above embodiment has been described with reference to a combustion apparatus using liquid fuel, a gas fuel may be used. In that case, the vaporizing cylinder is simply a mixing pipe.

[0014]

As described above, according to the present invention, the combustion apparatus is used for a long time and the combustion of the vaporizing cylinder and the burner unit is performed.
Even if the airtightness of the contact part between the opening lower part of the chamber and the contact part between the vaporization cylinder and the lid deteriorates, the incomplete combustion state of the combustion gas or the air-fuel mixture is prevented from leaking into the room from these parts. thing
Thus , indoor safety can be ensured and the durability of the combustion device can be improved.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a cross section of a combustion apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the combustion device.

FIG. 3 is a longitudinal sectional view of the combustion device.

FIG. 4 is a sectional view taken along line B-B 'of FIG. 3;

FIG. 5 is a cross-sectional view of a conventional combustion device.

FIG. 6 is a sectional view taken along line C-C ′ of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vaporization cylinder 1a Lid 7 Combustion chamber wall 8 Combustion chamber 9 Flame port 9a Flame port at the bottom of combustion chamber wall 15 Burner cover 16 Secondary air chamber 26 Secondary air hole

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-1-222105 (JP, A) JP-A-1-10709 (JP, A) (58) Fields investigated (Int.Cl. ⁶ , DB name) F23D 11/10 F23C 5/28 F23D 11/40 F23D 11/24 F23D 14/08

Claims (1)

(57) [Claims] A combustion chamber is formed by opposing two combustion chamber walls having a large number of flame openings, and a burner cover is provided outside the combustion chamber wall, and a lower portion of the burner cover and the combustion chamber wall are formed. under
And the secondary between the burner cover and the combustion chamber wall.
Burner having an air chamber and opening the lower part of the combustion chamber
Unit, and open the lower part of the combustion chamber of this burner unit.
A vaporizing cylinder whose top is covered with a lid is arranged at the mouth and this vaporizing cylinder
Lid outer peripheral portion and the lower opening edge of the combustion chamber of the burner cover
And the lower opening of the combustion chamber is closed with this vaporizing cylinder, and a secondary air hole is provided between a contact portion between the vaporizing cylinder and the burner case and a lowermost flame port of each combustion chamber wall. The combustion devices arranged in a row.