JP3065677B2 - Radiant tube burner using swirling combustion - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to swirling combustion (hereinafter referred to as vortex combustion) of fuel gas in an elongated heat-resistant pipe.
The present invention relates to a rod-shaped heat radiator that uses a vortex burner that forms an elongated rod-shaped flame, heats a heat-resistant pipe with this flame, and is an elongated heat-generating element that does not expose the flame.

[0002]

2. Description of the Related Art As a heater using electric heat, a long, thin, rod-shaped, red-heated heating element can be easily formed without generating a flame. Therefore, a rod-shaped, high-temperature radiator is often used for heating, cooking, hot water supply and the like. ing. However, when using a burner that utilizes the combustion of fuel such as gas as a heat source, if the combustion chamber is too narrow, the combustion ends at the entrance of the combustion chamber, and a uniform temperature distribution is obtained throughout the combustion chamber. High temperature heat generation (radiation) in the shape of an extremely thin rod
The body has not been put to practical use.

[0003] Also, it has been known that a vortex flow is generated in a cylindrical combustion chamber, and fuel is supplied to the center of the cylindrical combustion chamber for combustion, whereby a vortex combustion flame excellent in flame holding effect and excellent in combustibility can be obtained. ing. However, there was no idea that this swirling combustion could be used to form a flame having an extremely narrow diameter.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a rod-shaped high-temperature heat radiator which can be maintained at a very high end to a very thin and long rod-shaped high-temperature heat radiator by a simple and inexpensive structure. To get.

[0005]

In order to achieve the above object, the present invention employs the following construction. (1) A nozzle having a cylindrical mixing chamber in which the fuel gas and air are supplied in a swirling flow, one end of which is coaxially connected to the nozzle, the other end is opened, and the inside is A heat-resistant pipe serving as a combustion chamber, a belt-shaped heat-resistant metal reflector that is inclined and fixed to the open end side of the combustion chamber and gradually reduces the cross-sectional area of the combustion chamber, and is attached to the mixing chamber or the combustion chamber. And heats the heat-resistant pipe by swirling combustion in the combustion chamber. (2) In the above, a configuration in which spiral irregularities in the turning direction are formed on the inner wall of the combustion chamber. (3) A configuration in which an air supply port for supplying secondary air in the swirling direction is provided in the middle of the combustion chamber. (4) A configuration in which the heat-resistant pipe is extended, the extension is bent into a U-shape, and exhaust holes are arranged in the extension.

[0006]

1 and 2 show a rod-shaped heat radiator 100 using a vortex burner according to one embodiment of the present invention. The rod-shaped heat radiator 100 has a cylindrical shape having a slightly larger diameter, and has a can-shaped nozzle 1 having a jet port 11 at the tip thereof, and a heat-resistant pipe 2 which is coaxially connected to the jet port 11 and has a smaller diameter and an elongated shape than the nozzle 1. And an ignition device 3 provided in the nozzle 1.

The inside of the nozzle 1 is a mixing chamber 10 in which fuel gas and combustion air are supplied in a swirling flow. The mixing chamber 10 has a cylinder having an inner diameter of 20 mm and a length of 40 mm. A gas tube 13 containing a spiral tube 12 having a small diameter and spiral irregularities in the center axis direction is inserted into the mixing chamber 10 to serve as a fuel gas supply port.
An air pipe 14 for supplying combustion air facing the nozzle 1 is tangentially inserted into the outer periphery of the gas pipe 13. In this embodiment, as shown in FIG. 2, the two air pipes 14 have an axis perpendicular to the axis of the mixing chamber 10 and are set to blow air into the mixing chamber 10 from a tangential direction. On the outlet side of the mixing chamber 10, electrodes 31 and 32 of the ignition device 3 by spark discharge are provided so as to face each other and form a spark discharge gap 33.

The pipe 2 is made of a heat-resistant metal pipe such as stainless steel,
An insulator tube, a heat-resistant glass tube, or the like is used, and the inside is a vortex combustion chamber 20, and an end is an opening 21. The swirling combustion chamber 20 has an inner diameter of 14 mm and a length of 40 cm, and the reflector 4 is disposed at the tip. The reflection plate 4 is formed by fixing a belt-shaped heat-resistant metal plate to the combustion chamber 20 so as to be inclined. The upstream end 41 contacts the inner wall of the vortex combustion chamber 20, and the downstream end 42 closes the opening 21 by about half. In.

The operation of the rod-shaped heat radiator 100 will be described.
The gas and air supplied to the mixing chamber 10 flow into the combustion chamber 20 as a swirling flow. In the center of the swirling vortex, the gas supplied in the axial direction to the axial center of the mixing chamber 10 or the premixed gas premixed with some air is stably present at a small swirling speed. At the outer peripheral portion of the vortex, air supplied with strong swirling to the outer peripheral portion of the mixing chamber exists at a high swirling speed, and the intermediate portion is a mixing region of fuel and air. The eddy combustion flame F is generated in the cylindrical mixing region, and stable eddy combustion is obtained. This combustion flame extends into the swirling combustion chamber for a long time, and almost the entire pipe 2 becomes red-hot, and becomes a high-temperature rod-shaped radiator.

The reflecting plate 4 has a function of preventing the eddy combustion flame F from becoming thinner on the tip side of the pipe 2 and, as a result, preventing the tip portion of the heat radiating portion from becoming sufficiently red-hot. That is, the reflection plate 4
And the pipe 2 is efficiently heated by the reflection of heat due to the heat and the approach of the eddy combustion flame F to the wall surface of the eddy combustion chamber 20. When the reflector 4 is provided, the pipe 2 glows red with a length of approximately 40 cm. The reflection plate 4 also has a function of reducing the amount of heat discharged from the distal end opening 21 and increasing the thermal efficiency of the pipe 2.

The rod-shaped radiator 100 can be used as a heating element for cooking or heating, for example, by arranging a plurality of rod-shaped radiators, and can also be used directly as a heat exchanger with a liquid such as water.

FIG. 3 shows a second embodiment. In this embodiment, the nozzle 1 has a large diameter at an intermediate portion, and combustion air is supplied to the large diameter portion from one air pipe 14 in a tangential direction. In addition, the nozzle 1 has a heat-resistant pipe 2 whose tip side 15 is narrowed in a multi-stage tapered shape and whose diameter is somewhat larger than the heat-resistant pipe 2
To the connecting portion 16. Further, a gas pipe 13 for fuel gas
Extends to the entrance of the connecting portion 16.

In this embodiment, the air becomes a swirling flow in the mixing chamber 10 and becomes a strong vortex from the connecting portion 16 to form the vortex combustion chamber 2.
Flows into 0. Fuel gas is ejected from the gas pipe 13 to the center of the vortex.

FIG. 4 shows a third embodiment. In this embodiment, a spiral pipe 17 is provided between the gas pipe 13 in the mixing chamber 10 and the main body of the nozzle 1 so as to be coaxial with them, and the air supplied to the mixing chamber 10 is swirled.

FIG. 5 shows a fourth embodiment. In this embodiment, an air pipe 14 is coaxially arranged on the outer circumference of the gas pipe 13,
A blade 18 for swirling air is provided in the gap between the two.

FIG. 6 shows a fifth embodiment. In this embodiment, fins 22 in the swirling direction of the swirl are formed on the inner wall of the swirl combustion chamber to increase the heat receiving area and maintain the swirling speed. Thereby, improvement in thermal efficiency and extension of the pipe 2 can be achieved. The same effect can be obtained by providing a spiral groove on the inner wall of the vortex combustion chamber instead of the fin 22.

FIG. 7 shows a sixth embodiment. In this embodiment, a secondary air pipe 19 is provided in the middle of the vortex combustion chamber 20 to supply additional secondary air to the vortex combustion chamber in a direction that promotes swirling. This makes it possible to increase the swirling speed and promote combustion in the middle of the vortex combustion chamber, reliably achieve the red heating of the rear half of the pipe 2, and make the temperature distribution of the rod-shaped radiator uniform.

FIG. 8 shows a seventh embodiment. In this embodiment, the rod-shaped heat radiator 200 extends the heat-resistant pie 2 and bends it into a U-shape. Some of the rod-shaped heat radiators 200 are juxtaposed so that the extension portions 23 face down, and are used as a heat source such as pottery. As a result, the exhaust heat can be used, and the thermal efficiency is improved.

According to the first aspect of the present invention, since the eddy combustion flame is formed in an elongated heat-resistant pipe, an elongated rod-shaped heat radiator that is red hot can be obtained. This rod-shaped radiator is suitably used as a heat source for heating, cooking, feeding, and the like. According to the second to fourth aspects of the present invention, the length of the elongated red heat radiator can be further increased. According to the fifth aspect of the present invention, in addition to the heat generated from the red heat portion of the rod-shaped heat radiator, the exhaust heat can be used, and the thermal efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a rod-shaped heat radiator.

FIG. 2 is a cross-sectional view taken along a line AB of the rod-shaped heat radiator.

FIG. 3 is a sectional view of a rod-shaped heat radiator according to a second embodiment.

FIG. 4 is a sectional view of a rod-shaped heat radiator according to a third embodiment.

FIG. 5 is a sectional view of a rod-shaped heat radiator according to a fourth embodiment.

FIG. 6 is a sectional view of a rod-shaped heat radiator according to a fifth embodiment.

FIG. 7 is a sectional view of a rod-shaped heat radiator according to a sixth embodiment.

FIG. 8 is a perspective view of a rod-shaped heat radiator according to a seventh embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 rod heat radiator 200 rod heat radiator 1 nozzle 2 heat-resistant pipe 3 igniter 4 reflector 10 mixing chamber 20 vortex combustion chamber 22 fin 23 extension 24 exhaust hole

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-56-71708 (JP, A) JP-A-2-103305 (JP, A) JP-A-1-200105 (JP, A) JP-A-2- 52906 (JP, A) JP-A 63-54919 (JP, U) JP-B-58-43641 (JP, B2) JP-B-51-7850 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23D 14/02 F23D 14/10 F23D 14/12 F23C 3/00 301

Claims (4)

(57) [Claims] A nozzle having a cylindrical mixing chamber in which fuel gas and air are supplied in a swirling flow;
One end of which is coaxially connected to the nozzle, the other end is opened, and heat pipe inside is in the combustion chamber, the combustion
It is fixed at an angle to the open end side of the chamber, and the sectional area of the combustion chamber is reduced.
A radiant tube burner using a swirling flow combustion , which comprises a belt-shaped heat-resistant metal reflecting plate to be gradually reduced and ignition means attached to the mixing chamber or the combustion chamber, and heats a heat-resistant pipe by the swirling flow combustion in the combustion chamber. 2. A radiant tube burner using swirling flow combustion according to claim 1, wherein spiral unevenness in the swirling direction is formed on the inner wall of the combustion chamber. 3. A radiant tube burner using swirling combustion according to claim 1, wherein an air supply port for supplying secondary air in a swirling direction is provided in the middle of the combustion chamber. 4. The radiant tube burner using swirling flow combustion according to claim 1, wherein the heat-resistant pipe is extended, the extension is bent into a U-shape, and exhaust holes are arranged in the extension.