JPH0210010A - Combustion apparatus - Google Patents

Abstract

PURPOSE:To produce a compact water boiler with a simple structure by using the external pipe of a double pipe as a combustion pipe, providing a tangential discharge port on the inner peripheral surface of the external pipe and a mixed gas straightener that is connected to the discharge port, and using the internal pipe as a water tube. CONSTITUTION:A cylindrical pipe 1 that is formed into a double cylindrical pipe shape consists of an external pipe 2 and an internal pipe 3. A slit hole 4 is nearly tangentially bored on the internal surface 5 of the external pipe, and throttle pipes 7 having a smaller inside diameter than the external pipe is furnished on the external pipe ends 6. The slit hole 4 is connected to a mixed gas straightener 9 having a same area of path as the slit hole, and further connected to a mixed gas supply pipe 10. The flow of the mixed gas from the supply pipe 10 is straightened, and spirally blown out from slit hole 4 uniformly. The internal pipe 3 is concentrically arranged with the external pipe 2, and supported with an adequate exhaust gas clearance 12 apart from the throttle pipes 7. An end of it is connected to a water supply pipe and the other end to a hot water supply port. The mixed gas is blown out along the internal surface 5 of the external pipe 2 from the slit hole 4 to form an annular flame 11. The mixed gas flows around the outside periphery of the flame 11, and exhaust gas flows around the inside periphery. The exhaust gas flows spirally and is discharged through the throttle pipes 7 after heating the internal pipe 3.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a combustor for domestic use.

BACKGROUND OF THE INVENTION The combustor according to the present invention utilizes the principle of a swirl-type elongated flame burner, which has recently been academically found to be optimal for flame observation. This burner uses a circular tube with a --like circular cross section, and blows out a mixed gas from the tangential direction of the circular cross section, thereby creating a substantially concentric annular flame in the circular tube along the circular tube. The exhaust gas flows on the inner side of the flame, and the mixed gas flows on the outer side of the flame, swirling toward both ends of the circular tube. Therefore, as it swirls, a uniform annular flame is formed, which is good for flame research, but practical application was completely unthinkable because the mixed gas would leak from both ends.

Problems to be Solved by the Invention As stated above, this invention provides a compact water heater with a simple configuration by applying the principle of a swirl-type extension flame burner used for analyzing combustion phenomena. be.

Means for Solving the Problems In order to solve the above problems, the combustor of the present invention uses a circular outer tube formed in a double-tubular shape as a combustion tube, and has a jet nozzle tangentially formed on the inner peripheral surface of the outer tube. A mixed gas rectifying section is provided, and the inner tube of the circular tube is configured as a water tube.

Function The present invention provides the mixed gas 3, . . .
> The gas is blown out from the slit hole in a tangential direction toward the inner peripheral surface of the outer tube, forming a swirling annular flame, and the combustion exhaust gas is blown out from the inner periphery of this flame toward both ends of the circular tube. Therefore, the inner pipe placed in the exhaust gas stream is effectively heated, and the water flowing therein is also heated and hot water is supplied.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1st
In the drawings and FIG. 2, reference numeral 1 denotes a circular tube formed into a double-tube shape, which consists of an outer tube 2 and an inner tube 3, each independent of the other. The outer tube 2 has a slit hole 4 pressed in a substantially tangential direction to the inner circumferential surface 5 of the outer tube, and an outlet end 6 of the outer tube is provided with a constricted portion 7 having a smaller diameter than the inner diameter of the outer tube. In this embodiment, the constricted portion 7 is formed to be more gently constricted than the outlet end 6 of the outer tube and to have parallel straight portions 8. Further, the slit hole 4 communicates with a mixed gas rectifying section 9 having a passage of approximately the same size, and further communicates with a mixed gas supply pipe 1o. Here, the relationship between the slit hole 4 and the mixed gas rectifier 9 is to rectify the mixed gas from the supply pipe 10 so that it is uniformly blown out from the slit hole 4 in a spiral shape. 11 is a flame formed in an annular shape.

In addition, the inner pipe 3 is formed concentrically with the outer pipe 2, and has one end connected to a water pipe (not shown) and the other end connected to a hot water supply outlet such as a faucet (not shown).
(not shown) and is supported with an appropriate exhaust gap 12 between the constriction part 7 and the exhaust gap 12.

In the above configuration, the mixed gas ejected from the slit hole 4 is ejected so as to come into contact with the inner periphery 5 of the outer tube 2, and is ignited to form an annular flame 11.

The outer periphery of the flame 11 forms a flow of mixed gas, and the inner periphery of the flame 11 forms a flow of combustion exhaust gas.

Since the inner pipe 3 is installed in this exhaust gas flow,
The inner tube 3 is strongly heated, and the water flowing inside it is also heated and discharged from the hot water supply port as hot water. On the other hand, the exhaust gas swirls while heating the inner pipe and is discharged from both ends of the constriction part 7 while heating the water pipe. Although the constricted portion 6 is not necessarily necessary when an inner tube is provided as in the present invention, it is desirable to provide it. This is because, depending on the conditions (for example, when the distance between the inner and outer tubes is large), there may be a portion where the flame 11 cannot be formed without the constriction part, and this gas may be exhausted without being burned. . The effect of the throttle part 7 is to push the swirling mixed gas on the inner circumferential surface of the outer tube toward the flame 11 side, allowing it to pass through the flame band and completely burn it.

Therefore, it seems necessary that the constriction part 7 be smaller than the flame diameter, but since a flame is formed and burned by bringing the mixed gas close to the flame zone, it is sufficient that it is close to the flame diameter. (In this embodiment, since such a state can be formed by the inner tube E, the throttle part is not necessarily required.) Effects of the Invention As described above, according to the combustor of the present invention, the outer peripheral side of the outer tube can be Since the flow is a mixed gas and the center side is a flow of combustion exhaust, combustion heat is concentrated inside the outer tube, effectively heating the inner tube that forms the water tube, while reducing heat loss from the outer tube. Therefore, the combustor has a simple configuration and can be provided as an lj unit with high thermal effect.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a combustor according to an embodiment of the present invention, and FIG. 2 is a plan sectional view thereof. 67, -7 1...--Inner tube, 2... Outer tube (combustion tube),
3... Sendai pipe (water pipe), 4... spout, 5...
...Inner circumferential surface of outer tube, 6...Outlet end of outer tube, 7...
... Throttle section, 9... mark, mixed gas rectification section.

Claims (2)

[Claims] (1) The outer tube of the circular tube formed in the shape of a double tube is used as a combustion tube,
A combustor, in which a jet port is provided tangentially on the inner circumferential surface of the outer tube to provide a mixed gas rectifier, and the inner tube of the circular tube is a water tube. (2) The combustor according to claim 1, wherein the outer tube has a constricted portion at the outlet end thereof, the diameter of which is smaller than that of the outer tube.