JPH01302012A - Combustion device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a household combustor, and is intended for use in small water heaters and the like.

BACKGROUND ART Conventionally, this type of combustor has been a small gas water heater as shown in FIG. 2 and a water heater as shown in FIG. 3.

The former forms a flame 15 in a wide combustion chamber called a drum 14, and a heat exchanger 16 with fins placed on top of the flame 15.
It heats water using a gas water heater, which requires a large capacity like the gas water heaters used in many home kitchens. Also,
The latter is a so-called radiant tube 17 used in commercial water heaters inserted into water. In this example, it is a double pipe type radiant tube, and a short flame 19 that does not cause soot is attached to the tip of the nozzle 18. and heat the water.

In these, the flame must be short to avoid sooting, and means are used to speed up the diffusion of fuel and air, causing heat to be generated near the nozzle and causing local heating of the tube. In addition, the diameter of the pipe is also thicker, and in practical use it is φ50rn.
rn or more.

Problems to be Solved by the Invention In the above devices, the equipment itself has a large volume, and it is impossible to install a thin and slim water heater in a narrow space, for example, in accordance with water pipes. . Even radiant tubes need to be thick to obtain the necessary amount of combustion, and need to be about the same size as a small household water heater. In addition, in this case, the smaller the diameter of the tube, the more likely the heat will be concentrated near the nozzle outlet as described above, and the more likely it will be localized heating.

The present invention solves these conventional problems, and eliminates local heating by forming a long flame and obtaining a long heating surface with small temperature difference, which was previously considered impossible. This system provides a combustor that can be used as a slim water heater by allowing water to flow through the combustor.

Means for Solving the Problems In order to solve the above problems, the combustor of the present invention uses a long inner tube separated from each other and formed into a double tube shape as a combustion tube, and a fuel nozzle is installed at one end of the combustion tube. A blower device is provided on the upstream side of the combustion tube, and the tip of the nozzle has a flat flame-holding surface, and a rotating body provided upstream at a distance from the nozzle allows the air from the blower to be A swirling flow is supplied to the combustion tube, and the outer tube of the long tube is configured as a water tube through which water passes.

Effect: With the above configuration, the present invention supplies swirled air from the upstream side of the nozzle so as to follow the flow of fuel ejected from the nozzle. It is thought that this swirling air uniformizes the diffusion surface with the fuel by swirling, forming a thin mixing surface with little turbulence, stretching the flow of the fuel, forming a very long flame in the combustion tube, and improving the heat balance. Forms a long heating surface with high heat resistance. By concentrically configuring the water pipes that allow water to pass through the outer periphery, heat transfer is made uniform, resulting in a slim water heater with good heating efficiency.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1st
In the figure, numeral 1 is a long tube separated into two passages in a double-tube shape, and is composed of an inner tube 2 and an outer tube 3. This inner tube 2 forms a combustion tube, and its length and diameter are determined depending on the target and amount of combustion, but according to experiments, the diameter is 10 mm or more and the length is 110 cm.
The above is also possible. For example, a flame length of 100 cm is obtained using a tube with a diameter of 16 mm. 4 is the combustion tube (inner tube) 2
A fuel nozzle for ejecting fuel is inserted concentrically into one end of the nozzle, and its tip forms a flat flame-holding surface 6 around the nozzle hole 5. Reference numeral 7 denotes a rotating body such as a swirling vane that swirls the combustion air supplied from a blower device 8 such as a fan, and is provided upstream of the nozzle 4 and concentrically therewith. 9 is a fuel pipe that sends fuel to the nozzle 4;
10 is a gasket for sealing. 11 is the combustion tube 2
Again, it is a long flame formed concentrically, and 12 is an exhaust port at the outlet end of the combustion tube 2. In addition, the nozzle 4
A distance is provided between the rotating body 7 and the rotating body 7 so that the swirling flow along the combustion pipe 2 is uniformly applied to the flow downstream from the nozzle 4. The outer tube 3 is a double tube concentrically with the combustion tube 2, and is a water tube that is separated from the combustion tube 2 and serves as a water flow path, and is configured with a length between the combustion tube and the passage. and one end of it is connected to a water pipe (
(not shown) and the other end are connected to a hot water faucet (not shown). Reference numeral 13 denotes a heat insulator surrounding the water tube (outer tube) 3.

In the above configuration, fuel gas is ejected from the nozzle 4, and air is supplied from the blower 8 as swirling air via the swirling body 7 from the upstream side of the nozzle 4 so as to be in contact with the flow of the fuel gas, and is ignited and burned. At this time, a flame is formed at the contact surface between the gas and the swirling air, but due to the swirling, the air forms a uniform contact surface with little turbulence and is supplied thinly and uniformly in the length direction of the combustion tube 2, making it extremely A long, thin flame 11 is formed in the center of the tube 2. In our experiments, for example, in a combustion tube with a diameter of 16 mm and a length of 1100 degrees, the length of the flame 11 was obtained to be 40 to 100 arn or more. Even with such a length, no soot is generated and a long flame 11 is formed within the combustion tube 2, creating a long heating surface with a small temperature difference. At this time, if water is allowed to flow from the tap into the water pipe 3 at the same time as the ignition, the water will be heated almost uniformly over the entire long combustion pipe 2. The hot water is then supplied from the faucet. Note that the strength of the swirling is desirably such that it does not disturb the gas jet flow.

Effects of the Invention As described above, the combustor of the present invention makes it possible to form a long flame in a thin tube, which was unimaginable in the past. It can be configured as a water heater, and because of its longer flame, it is a durable device that does not cause local heating, and it can also be used as a heat source device that can be used for heating, drying, oven heating, etc. Incidentally, if a pipe with a diameter of 16 rnm is used, it is possible to construct a combustor as any water heater with a diameter of 30 mm.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a combustor in an embodiment of the present invention,
FIG. 2 is a plan view of the heating section of a conventional water heater, and FIG. 3 is a configuration diagram of a water heater using the same radiant tube. 1...Long pipe (double pipe), 2...Soot burning pipe (inner pipe), 3...Water pipe (outer pipe), 4...Fuel nozzle, 6 ... Flame-holding surface, 7 ... Rotating body, 8
...Blower device. Name of agent: Patent attorney Toshio Nakao and one other person
Figure 2 Figure 3; 17'! !

Claims (1)

[Claims] A long inner tube separated from each other and formed into a double tube shape is used as a combustion tube, a fuel nozzle is provided at one end of the combustion tube, a blower is provided on the upstream side of the combustion tube, and a blower is provided at the tip of the nozzle. A swirling body having a flat flame-holding surface and provided upstream at a distance from the nozzle gives a swirling flow to the air from the blower and supplies it to the combustion tube, and the outer tube of the long tube. A combustor configured as a water pipe that allows water to pass through.