JP2000234706A - Burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain interference between combustion flames discharged from a plurality of flame holes by forming the flame holes which face with each other with a near portion having a small distance therebetween and a far portion by which the flame holes are rendered to be receded from each other from the near portions. SOLUTION: A burner top 18 is provided with a first flame hole 16 and a second flame hole 17 whose apexes that pass a center line C are located so as to face with each other. A distance L between the first flame hole 16 and the second flame hole 17 is the shortest between the apexes and becomes gradually longer toward both of the side edges. Although the distance L is short at the central portion, it is long at the side edge portions, and therefore the degree of interference between the combustion flames can be made considerably low. Thus the surface temperature of the first flame hole 16 and the second flame hole 17 can be restrained from being unduely raised. As a result, stable combustion flames are obtained, being free from a backfire phenomenon.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner provided in a household oil heater or the like, and more particularly to a burner which mixes fuel gas ejected from a carburetor with air and burns it.

[0002]

2. Description of the Related Art FIG. 4 is a front sectional view showing a configuration of an oil heater provided with a burner having two flame openings. As shown in FIG. 4, a fuel supply tank 12 for filling a liquid fuel such as kerosene is provided on the inner side of the main body 1. The supply of fuel to the fuel tank 12 is performed by opening the casing lid of the main body 1 and taking out the fuel from the fuel port (not shown) communicating with the fuel tank 12. Further, an oil tray 6 is provided below the fuel tank 12, and the fuel filled in the fuel tank 12 is supplied to the oil tray 6.

[0003] An electromagnetic pump 2 is mounted on an upper portion of the oil receiving tray 6, and the electromagnetic pump 2 sucks up fuel and sends it to a carburetor 7. The vaporizer 7 is heated by the heater 9 and kept at a high temperature, and gasifies the fed fuel. The vaporizer 7 is first preheated by the heater 9 and kept at a high temperature.
Because the burner 13 is located above the flame 17, once the burner 13 starts burning, the tip of the burner 13 is heated by the combustion flame from the second flame 17. Then, heat is gradually transmitted from this tip portion, and the temperature of the entire vaporizer 7 rises. Therefore,
Even if the vaporizer 7 is not heated by the heater 9, a sufficient amount of heat for the vaporizer 7 itself to gasify the liquid fuel can be recovered from the combustion flame. As a result, the control unit (not shown) controls the heater 9.
ON / OFF control is performed, and the power consumption in this portion is reduced.

[0004] The burner 13 is housed in a combustion enclosure 5 formed by the combustion chamber 3 and the burner box 4.
FIG. 5 is an enlarged view of a main part showing the configuration of the conventional combustion device for an oil heater. As shown in FIG. 5, the burner 13
Burner top 18, bottom 19 combined with this burner top 18, burner top 18 and bottom 19
And a partition plate 20 disposed between the partition plate 20 and partially partitioning the two,
A rectifying plate 21 attached to the partition plate 20 is provided.

[0005] The burner top 18 includes a first flame port 16 located relatively upstream along a flow path (arrow F) of the mixed gas in the burner 13 and a second flame port 17 located downstream. Is formed. Both the flame ports 16 and 17 are attached to the outer periphery of the burner top 18 by a flame net 22 having excellent heat resistance and oxidation resistance, and attached to the inner periphery of the burner top 18 by welding or the like, and are blown out from the flame port. And a back net 23 for making the flow distribution of the mixed gas uniform over the entire flame outlet.

FIG. 6 is a top view of a main part showing a structure around a flame outlet provided in a conventional burner. As shown in FIG.
The burner top 18 is provided with a first burner port 16 and a second burner port 17, both of which are substantially rectangular, with a predetermined interval L therebetween. Therefore, the predetermined distance L between the two flame outlets 16 and 17
Is always constant in the width direction of the flame outlet. A frame sensor 2 extending from the outside of the burner 13 above the first flame port 16
4 and the ignition heater 25, when the burner 13 is viewed from above, at least their tips are the first flame ports 16 as shown in the figure.
It is arranged to hang on a part of the.

Next, the usage of the burner 13 configured as described above will be described with reference to FIG. First, liquid fuel such as kerosene is fed into the vaporizer 7 preheated by the heater 9 and gasified. A nozzle 8 is provided at an ejection port for ejecting vaporized gas in the vaporizer 7, and a fuel gas 10 is ejected from the nozzle 8 toward a gas inlet 13 a of a burner 13. At this time, the air 11 is simultaneously sucked by the ejector effect, and is uniformly mixed with the fuel gas inside the burner 13.

[0008] The mixed gas flows through the gas flow path partitioned by the partition plate 20 in the burner 13 as shown by an arrow F, and is blown out from the first and second flame ports 16 and 17. At this time, the ignition heater 25 made of ceramic provided above the first flame port 16 becomes red-hot according to a command of a control unit (not shown), and ignites the mixed gas ejected from the first flame port 16. Further, the combustion flame becomes a kind of fire, and is ignited by the mixed gas spouting from the adjacent second flame port 17.
Combustion also starts at the second flame port 17.

Here, if the distance L between the first flame port 16 and the second flame port 17 is too large, the fire may not be performed properly. The length is set in consideration of ease. The flame sensor 24 is a sequence that detects a weak current from the combustion flame and feeds back the combustion state to a control unit (not shown). For example, when the flame sensor 24 detects an abnormality in the combustion state, the control unit , The operation of the oil heater is stopped. In FIG. 5, reference numeral 21 denotes a rectifying plate for adjusting the flow of the mixed gas so that the mixed gas flowing to the first flame port 16 and the second flame port 17 becomes substantially the same. It is attached by welding or the like.

The combustion exhaust gas is discharged from the upper portion of the combustion chamber 3 to the outside of the combustion chamber 3 by the suction force of the convection blower 14 provided behind the combustion chamber 3 in the main body 1, and the convection air is blown. After being mixed with the room air taken in by 14, it is discharged into the room as warm air from a warm air outlet (not shown).

[0011]

However, in such a conventional burner, the first flame 16 and the second
Since the distance L (see FIG. 6) to the flame opening 17 cannot be made too long for the above-mentioned reason, the combustion flames coming out of both the flame openings 16 and 17 interfere with each other, and the surface temperature between the flame openings rises remarkably. As a result, the combustion speed becomes faster than the ejection speed of the mixed gas from the flame outlet, and combustion starts inside the flame outlet,
This causes a so-called flashback phenomenon, which accelerates the deterioration and deformation of the members constituting the flame port due to long-term use, and thus lowers the reliability of the oil heater itself.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and in a burner having a plurality of flame ports, interference between combustion flames coming out of each flame port is suppressed by changing the shape of the flame port. It is an object of the present invention to provide a burner capable of producing a stable combustion flame which does not cause a flashback phenomenon.

[0013]

According to a first aspect of the present invention, there is provided a burner comprising: a vaporizer for vaporizing liquid fuel; and a mixed gas of fuel and air vaporized by the vaporizer. In a burner having two flames to be burned, a portion of the two flames opposed to each other is arranged so that an interval between the two flames is a small adjacent portion, and the flames are spaced apart from the adjacent portion. It is characterized by being formed with a retreating part to retreat.

According to this structure, the distance between the two flame ports is not constant in the width direction of the flame port as in a conventional rectangular flame port.

According to a second aspect of the present invention, there is provided a burner according to the first aspect, wherein the near portion and the retreat portion are formed in one of the flame openings.

According to this configuration, as the other flame outlet,
The conventional rectangular shape can be used as it is.

According to a third aspect of the present invention, there is provided the burner according to the first or second aspect, wherein at least one of the flame openings has a convex pentagonal shape, and one vertex of the convex pentagonal shape has It is characterized by being arranged so as to face the other flame outlet.

According to this configuration, the two flame ports are close to each other near the vertex of the convex pentagonal flame port facing the other flame port, and the distance between them gradually increases toward the side edge.

A burner according to a fourth aspect of the present invention is the burner according to any one of the first to third aspects, wherein the fuel gas and the air are provided above the flame opening and near the adjacent portion or the apex. And ignition means for igniting the mixed gas to start combustion.

According to this configuration, the area of the flame outlet is small,
Ignition is performed at a low flow rate of the mixed gas.

According to a fifth aspect of the present invention, in the burner according to any one of the first to fourth aspects, a combustion state of the mixed gas is detected above a portion having a large area of the flame port. A combustion flame detecting means is provided.

According to this configuration, the combustion flame detecting means touches the combustion flame where the area of the flame opening is large and a large combustion flame is obtained, as in the case where the conventional flame opening is rectangular.

[0023]

Embodiments of the present invention will be described with reference to the drawings. The burner according to the present invention is characterized by the shape of the flame outlet, and the other portions common to the burner according to the prior art are denoted by the same reference numerals, and detailed description thereof will be omitted.

The burner 13 according to the present invention has the same external shape as that shown in FIG. 5, and the first and second flame ports 16 and 17 are provided at substantially the same positions. . As shown in FIG. 2, both the flame ports 16 and 17 according to the present invention have a convex pentagonal shape whose side edges are parallel and which are symmetrical with respect to the center line C. A mouth net 22 is provided.

The first and second flames 16 and 17
Are provided on the burner top 18 such that vertices passing through the center line C (that is, the axis of line symmetry) face each other as shown in FIG. In FIG. 1, 25 is the first
This is an ignition heater provided so that its tip is located slightly above the flame port 16 and near the apex. Also, 24
Is a frame sensor provided above the large area of the first flame port 16 and substantially parallel to the ignition heater 25. The area of the first flame port 16 becomes relatively large below the tip of the frame sensor 24, and relatively small around the tip of the ignition heater 25.

Accordingly, when the mixed gas ejected from the first flame port 16 is ignited by the ignition heater 25, the flame port area is small,
Since the ignition is performed at a location where the gas ejection amount is relatively small, abnormal noise generated at the time of ignition can be reduced, and the ignition can be reliably performed. on the other hand,
The flame sensor 24 has a large flame opening area and comes into contact with the combustion flame where a large combustion flame is obtained. Therefore, regardless of the detection sensitivity of the frame sensor 24, accurate and accurate detection of the combustion state can always be performed stably. it can.

The distance L between the first burner port 16 and the second burner port 17 is the shortest between the vertices passing through the center line C, and gradually becomes longer toward both side edges. The combustion flame ignited at the first flame port 16 ignites from the vicinity of the apex adjacent to each other to the second flame port 17, and the combustion of the mixed gas starts at the second flame port 17. Thus, the combustion flame is ejected from both the first flame port 16 and the second flame port 17.

However, in comparison with the conventional case where the distance L between the flame ports is always constant in the width direction of the flame port, in the flame ports 16 and 17 according to the present invention, the center distance L is substantially at the center. Is short, but widens at the side edges, so that the extent to which the combustion flames interfere with each other can be considerably smaller than with conventional burners. As a result, the first flame 16 and the second flame 17
An excessive rise in surface temperature during the period is suppressed, and a stable combustion flame free from the risk of flashback can be obtained.

In this embodiment, the first flame port 16 and the second
Although the case has been described in which both the flame ports 17 have a convex pentagonal shape, the invention is not limited to this. For example, as shown in FIG. 3, one of the flame ports 17 may have a rectangular shape as in the related art. Also in this case, the portions of the two flame outlets 16 and 17 facing each other include:
An adjacent portion where the interval between the two flame ports 16 and 17 is small, and a retreat portion where the both flame ports 16 and 17 are retracted from the close portion are formed, and the above-described both flame ports 16 and 17 are formed.
Have the same effect as in the case of a convex pentagonal shape.

Further, the number of flame ports may be increased. For example, the first flame port 16 and the second flame port 17 are spaced apart from each other, and two apexes pass through the center line between the two flame ports 16 and 17 and are symmetric with respect to the center line. A new convex hexagonal flame outlet is disposed such that vertices passing through the center line face each other. In this case, the same effect as in the above-described case of two burners can be expected, and the amount of heat per unit time obtained from one burner increases as the number of burners increases.

[0031]

According to the present invention having the above construction, according to the first aspect of the present invention, a close portion having a small gap between the flame ports is formed at a portion of the two flame ports provided on the burner opposed to each other. Thereby, for example, even if the ignition means is provided only in one of the two flame outlets, the mixture gas ejected from this flame outlet is ignited, and once the combustion starts, the flame outlet comes close to The mixed gas ejected from the other flame outlet can also be ignited and burned. In addition, the two flame outlets formed an evacuation part going away from each other,
The degree to which the combustion flames ejected from the two flame openings interfere with each other can be considerably suppressed, and a high-performance burner without flashback phenomenon can be obtained.

According to the second aspect of the present invention, since the near portion and the retreating portion of the two flame ports are formed in one flame port, conventional burner parts can be used in the other flame port. In addition, a high-performance burner that does not cause a flashback phenomenon can be obtained at low cost.

According to the third aspect of the present invention, at least one of the two flame ports is formed in a convex pentagonal shape, and one of the convex pentagonal shapes is disposed so as to face the other flame port. By making a small change to the shape of the rectangular flame, the degree of interference between the combustion flames ejected from the two flames can be considerably suppressed, and a high-performance burner that does not cause flashback can be easily achieved. can get.

According to the fourth aspect of the present invention, since the ignition is performed in a small flame opening area and a relatively small gas ejection amount, abnormal noise generated at the time of ignition can be reduced, and ignition can be performed. Can be performed reliably.

According to the fifth aspect of the present invention, since the combustion flame detecting means has a large flame opening area and touches the combustion flame where a large combustion flame is obtained, the detection sensitivity of the combustion flame detecting means is good or bad. In this way, accurate detection of the combustion state can always be performed stably.

[Brief description of the drawings]

FIG. 1 is a main part top view showing a configuration near a flame outlet of a burner according to the present invention.

FIG. 2 is a perspective view of an example of a flame outlet according to the present invention.

FIG. 3 is a main part top view showing a configuration near a flame outlet of a burner according to the present invention.

FIG. 4 is a front sectional view showing a configuration of an example of a conventional oil heater.

FIG. 5 is an enlarged view of a main part showing a configuration of a combustion device part in FIG. 4;

FIG. 6 is a main part top view showing a configuration near a flame outlet of a conventional burner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Solenoid valve 3 Combustion chamber 4 Burner box 5 Combustion enclosure 6 Oil pan 7 Vaporizer 8 Nozzle 9 Heater 10 Air 11 Fuel gas 12 Refueling tank 13 Burner 14 Convection blower 16 First flame 17 Second flame 18 Burner top 19 Bottom 20 Partition plate 21 Rectifier plate 22 Flame net 23 Back net 24 Frame sensor 25 Ignition heater

Claims (5)

[Claims] 1. A burner having a vaporizer for vaporizing liquid fuel and two flames for burning a mixed gas of fuel and air vaporized by the vaporizer, wherein the two flames face each other. A burner characterized in that the portion is formed by an adjacent portion where the interval between the two flame openings is small, and a retreat portion where the flame opening is retracted so as to move away from the adjacent portion. 2. The burner according to claim 1, wherein said approaching portion and said retreating portion are formed in one flame port. 3. The method according to claim 1, wherein at least one of the flame outlets has a convex pentagonal shape, and one vertex of the convex pentagonal shape is disposed so as to face the other flame outlet. The burner according to claim 2. 4. An ignition means for igniting a gaseous mixture of fuel gas and air to start combustion above the flame opening and near the apex or near the apex.
The burner according to claim 3. 5. The combustion flame detecting means according to claim 1, wherein a combustion flame detecting means for detecting a combustion state of the mixed gas is provided above a portion having a large area of the flame port. Burner.