JPH056087B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a combustion device such as an oil hot air heater.

Conventional Technology In recent years, with heating appliances using oil and gas combustion devices, there has been a demand for combustion devices that can adjust combustion over a wide range from low to high calorie due to increasing awareness of comfort, energy conservation, etc. There is. An example of such a combustion apparatus will be described below with reference to FIG. 2. Reference numeral 1 denotes a bottomed cylindrical vaporizing cylinder, and the inside thereof serves as a mixing section 2 for vaporizing fuel and mixing it with air. 3 is a cylindrical burner head attached above the opening of the vaporizer cylinder 1;
The lower part has a narrow cylindrical part 4 with an integrated aperture, and the peripheral wall is provided with a plurality of elongated flame holes 5. Reference numeral 6 denotes a burner lid that covers the upper part of the burner head 3, and together with a heat insulating lid 7 disposed below the burner lid, the burner lid 6 is connected to the burner head 3 through a tightening portion 8 that passes through the inside of the burner head 3 from the mixing section 2 side toward the burner lid 6 side. It is closely fixed to the burner head 3. Reference numeral 9 denotes a pressure equalizing plate provided within the burner head 3, which has a plurality of small holes 9a and covers the narrow cylindrical portion 4.
10 is a cylindrical mixing cylinder that covers the pressure equalizing plate 9;
It is placed at the bottom of the burner head 3. 11
A porous cylinder is provided in close contact with the outer peripheral side wall of the burner head 3, and is stretched so as to cover the plurality of flame holes 5, and is made of wire mesh or a porous material.

The operation of the combustion apparatus configured as described above will be explained below. First, fuel vaporized in the vaporization tube 1 and combustion air are premixed in the mixing section 2, and the resulting mixed gas flows into the burner head 3 through the narrow tube section 4 provided above the vaporization tube 1. The mixed gas that has flowed into the burner head 3 is
It passes through the small hole 9a of the pressure equalizing plate 9 covering the cylinder part 4 and is ejected from the upper part of the mixing cylinder 10. Here, since the upper part of the burner head 3 is covered and sealed with the burner lid 6 and the heat insulating lid 7 via the tightening part 8, the mixed gas is ejected from the flame hole 5 provided in the peripheral wall of the burner head 3, A flame is formed around the periphery of the flame.

Problems to be Solved by the Invention However, in the above configuration, the pressure equalizing plate 9, the mixing cylinder 10, etc. are used to improve mixing so that a uniform flame is formed in each flame hole 5 of the burner head 3, and each flame hole is Although the variation in the air-fuel ratio of the mixed gas ejected from 5 is suppressed, the amount of mixed gas ejected from the flame hole 5a facing the tightening part 8 is downstream of the tightening part 8, so that the amount of mixed gas is different from that of the other one. This results in a locally non-uniform flame.

On the other hand, in the above configuration, in order to maintain a good combustion state from strong combustion with a large combustion amount to weak combustion with a small amount of combustion, it is necessary to prevent the flame from lifting from the flame hole 5 surface during strong combustion. It is necessary to suppress the speed of the ejected mixed gas. For this purpose, the opening area of the flame hole 5 is made large,
That is, measures are taken to reduce the flame hole load and slow down the flow rate of the mixed gas ejected from the flame hole 5. Therefore, under the best combustion conditions during weak combustion, the ejection velocity of the mixed gas is smaller, that is, the flame port load is smaller.

From the above, during weak combustion, the flame hole load on the flame hole 5a facing the tightening part 8 is smaller than on the other flame holes 5b, so the flame adheres closely to the porous cylinder 11 near the flame hole 5a. Otherwise, the perforated cylinder 11 itself locally becomes red hot and reaches a high temperature, which may eventually exceed the heat resistance of the perforated cylinder 11 and cause damage, or the damaged part may cause backfire combustion within the burner head 3. Ta.

The present invention solves the above-mentioned problems, and is safe and durable, capable of maintaining good combustion conditions in a wide range from low calorie to high calorie, and preventing local temperature rise of the porous cylinder. This provides a combustion device with excellent performance.

Means for Solving the Problems In order to achieve the above object, the combustion apparatus of the present invention includes a perforated tube provided on the outer periphery of the peripheral wall of the burner head, a cylindrical mixing tube disposed inside the burner head,
In addition, an opening is provided in the peripheral wall portion of the mixing cylinder that faces the tightening portion.

Effects With the above configuration, the present invention allows a part of the mixed gas to be ejected from the opening provided in the peripheral wall of the mixing tube, and the amount of mixed gas ejected from the flame hole facing the tightening portion to be ejected from other flame holes. It can be made equal to the amount of mixed gas. Therefore, the flame formed on the outer periphery of the porous tube becomes uniform, and it is possible to prevent a local temperature rise in the porous tube when reducing the calorie content.
The combustion device is highly durable, safe, and has a wide range of calorie adjustment.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 21 is a bottomed cylindrical vaporizing cylinder, and the inside thereof is a mixing part 22 for vaporizing fuel and mixing it with air. Reference numeral 23 denotes a cylindrical burner head attached above the opening of the vaporizing cylinder 21, which has a narrow cylinder part 24 with an integral crest at the bottom, and a plurality of elongated flame holes 2 in the peripheral wall.
5 is provided. 26 is the burner head 2 mentioned above.
The burner head 2 is a burner lid that covers the upper part of the burner head 2, together with the heat insulating lid 27 disposed below it.
The burner head 23 is tightly fixed to the burner head 23 via a tightening portion 28 consisting of a bolt that passes through the inside of the burner head 23 from the mixing portion 22 side toward the burner lid 26 side. 29
A pressure equalizing plate is provided in the burner head 23, has a plurality of small holes 29a, and covers the narrow cylindrical portion 24. Reference numeral 30 denotes a cylindrical mixing cylinder having a donut-shaped ceiling wall that covers the pressure equalizing plate 29, and an opening 3 in the peripheral wall at a position facing the tightening part 28.
1 is provided and placed at the bottom of the burner head 23. Reference numeral 32 denotes a porous cylinder provided in close contact with the outer peripheral side wall of the burner head 23, and includes a plurality of flame holes 25.
It is stretched so as to cover it, and is made of wire mesh.

The operation of the above configuration will now be described.
First, fuel vaporized in the vaporization tube 21 and combustion air are premixed in the mixing section 22, and the mixed gas is transferred to the vaporization tube 21.
It flows into the burner head 23 through a narrow cylindrical portion 24 provided above. The mixed gas that has flowed into the burner head 23 passes through the small hole 29a of the pressure equalizing plate 29 covering the cylinder part 24, and is ejected from the opening in the donut-shaped ceiling wall of the mixing cylinder 30 and the opening 31 provided in the peripheral wall of the mixing cylinder 30. do. Since the upper part of the burner head 23 is covered and sealed by the burner lid 26 and the heat insulating lid 27 via the tightening part 28, the mixed gas is ejected from the flame hole 25 provided in the peripheral wall of the burner head 23, Forms flame around the outer periphery.

Here, in this combustion device, since the opening 31 is provided in the peripheral wall portion of the mixing tube 30 that faces the tightening portion 28, a portion of the mixed gas is directly tightened through the opening 31 provided in the peripheral wall portion of the mixing tube 30. Flame hole 2 facing part 28
It starts to erupt from 5a. The amount of ejected gas changes depending on the size of the opening 31, and compensates for the difficulty in ejecting the mixed gas due to the wake of the tightening portion 28. Therefore, the flame hole 25 facing the tightening part 28
The amount of gas ejected from a is equal to the amount of mixed gas ejected from the other flame hole 25b. As a result, the flame hole load of each flame hole 25 becomes equal, the flame formed on the outer periphery of the porous cylinder 32 becomes uniform, and when the flame is burned, the flame hole 25 facing the tightening part 28
It is possible to prevent the problem of only the flame formed by the flame 5a coming into too close contact with the porous tube 32 and causing a local temperature rise in the porous tube 32.

Effects of the Invention As is clear from the above description of the embodiments, according to the present invention, a good combustion state can be maintained in a wide range from low calorie to high calorie, and local red heat and breakage of the porous cylinder can be prevented. This makes it possible to provide a highly safe and durable combustion device that is free from combustion defects such as backfire.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a combustion device according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional combustion device. 22...Mixing section, 23...Burner head, 25
... Flame hole, 26 ... Burner lid, 28 ... Tightening part, 30 ... Mixing cylinder, 31 ... Opening, 32 ... Porous cylinder.

Claims (1)

[Claims] 1. A mixing section that mixes air and fuel, a cylindrical burner head that burns the mixed gas from the mixing section through a plurality of flame holes, and a cylindrical burner head disposed inside the burner head so as to cover the mixing section. a mixing cylinder,
The burner head is equipped with a burner lid attached to cover the upper part of the burner head, a tightening portion for fixing the burner lid in close contact with the burner head, and a perforated cylinder disposed on the outer periphery of the peripheral wall of the burner head,
The tightening portion is configured to penetrate inside the burner head from the mixing portion side toward the burner lid side, and
The combustion device includes an opening in a peripheral wall portion facing the tightening portion of the mixing cylinder.