JPS6318081B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a combustion device, in particular a combustion device equipped with a vaporizer.

[Conventional technology]

Conventionally, this type of combustion apparatus recovers a portion of the heat of combustion gas as heat for vaporizing combustion in a vaporizer using a heat conductive plate or the like provided in a combustion chamber. Further, at the time of ignition, the temperature inside the combustion chamber is low and the heat for vaporizing the fuel cannot be recovered, so an external heat source such as a heater is used to temporarily heat the vaporization chamber.

[Problems to be solved by the invention] By the way, the heat conduction plate for recovering a part of the heat of the combustion gas is usually made integrally with the vaporizer and the side wall of the combustion chamber, so it has a large heat capacity, and when ignited, Even if the heater is energized, it takes time to raise the temperature of the vaporization chamber of the vaporizer to the desired temperature. In other words, it takes time to ignite, and heating operation cannot be performed immediately. In view of the above-mentioned points, the present invention aims to provide instant heat upon ignition and to improve the start-up at the start of heating operation.

[Means for solving problems]

The present invention provides a combustion device equipped with a combustion chamber and a vaporizer, in which the combustion chamber and the vaporizer are separated and arranged at an interval, and a gravity heat pipe that transmits heat only in one direction is provided at the upper end of the combustion chamber and the vaporizer. The present invention is characterized in that the lower end of the carburetor is disposed within the combustion chamber or a duct through which combustion exhaust gas passes, and that a heating means for temporarily heating the carburetor is provided on the carburetor side.

[Effect]

A gravity heat pipe only has an evaporative liquid sealed in a closed container, and no substance having capillary action, such as a porous material, is present in the closed container. Therefore, heat is transmitted from the lower end to the upper end of the heat pipe by the boiling-condensing action of the evaporative liquid, but the heat pipe has the property of not transmitting heat in the opposite direction. Since the vaporizer is disposed at the upper end of the gravity heat pipe and the lower end is on the combustion chamber side, there is no heat transfer from the vaporizer side of the heat pipe. Therefore, when the vaporizer is first heated by the heating means, the heat generated by the heating means is less likely to escape to the combustion chamber side via the heat pipe. Therefore, the heat generated by the heat generating means is effectively used for heating the vaporizer, and it is possible to rapidly heat the vaporizer.

〔Example〕

Hereinafter, the present invention will be described in detail based on specific embodiments shown in the drawings.

1 and 2 are diagrams showing one embodiment of the present invention, FIG. 1 being a cross-sectional side view thereof, and FIG. 2 being a cross-sectional view taken along the - arrow in FIG. 1. In these figures, a combustion chamber 4 surrounded by a side wall 1, a top wall 2 and a bottom wall 3 is shown.
Inside, a burner 5 is installed at the top,
A discharge port 6 for discharging the combustion gas generated by the burner 5 is provided at the bottom thereof.

A carburetor 7 connected to a burner 5 is provided outside the combustion chamber 4 and spaced apart from the side wall 1 . The vaporizer 7 includes a vaporization chamber 8 that introduces a mixture of fuel and air and vaporizes it, and a heater 9 as a heat source during ignition.

A gravity heat pipe 10 for heating the vaporization chamber 8 of the vaporizer 7 is bent into an L shape, and the horizontal portion of its lower end is disposed below the burner 5 in the combustion chamber 4, and after passing through the side wall 1. The rising portion of the upper end of is disposed so as to be embedded in the vaporizer 7.
Reference numeral 11 denotes a flange provided at a penetration point of the side wall 1 of the gravity type heat pipe 10, and a heat insulating packing 12 is interposed between the flange 11 and the side wall 1. Reference numeral 13 indicates a fin provided on the combustion chamber 4 side of the gravity heat pipe 10, and reference numeral 14 indicates an evaporative liquid such as water, fluorocarbon, or dowsum sealed in an appropriate amount within the heat pipe 10.

In such a configuration, when the burner is ignited, the heater 9 of the vaporizer 7 is energized to heat the vaporization chamber 8. At this time, the vaporizer 7 is separated from the side wall 1 of the combustion chamber 4 and has a certain distance therebetween, and the gravity heat pipe 10 also has a thin wall thickness, so its heat capacity is small, and the gravity heat pipe 10 has a small upper end. Since no heat is transferred from the bottom to the lower end, the heat generated by the heater 9 is not transferred to the combustion chamber 4, and the vaporization chamber 8 immediately reaches the desired temperature. As a result, the mixture of fuel and air introduced into the vaporization chamber 8 is immediately vaporized and flows to the burner 5.

After the burner ignites, the temperature inside the combustion chamber 4 becomes high, so that the horizontal portion of the lower end of the gravity heat pipe 10 is heated. As a result, the evaporative liquid 14 accumulated at the lower end inside the pipe boils, becomes vapor, flows to the upper end, condenses there, returns to the lower end, and then repeats this boiling-condensation action to vaporize. Heat is transferred to the upper end disposed within the vessel 7.

Therefore, the vaporization chamber 8 is heated to a desired temperature only by the heat recovered from the gravity heat pipe 10, and the air-fuel mixture is vaporized and flows to the burner 5. In this state, there is no need to energize the heater 9.

In this embodiment, the gravity heat pipe 1
Since the horizontal portion of the lower end of the pipe 0 is provided with fins, more heat from the burner 5 can be transferred to the evaporative liquid 14 in the pipe.

FIGS. 3 and 4 show other examples of the combustion apparatus of the present invention. In this example, the upper end of the gravity heat pipe 10 is disposed approximately at the center of the vaporization chamber 8 of the vaporizer 7 with a gap between them, and the upper end of the gravity heat pipe 10 and the vaporizer are placed in this space. A plurality of plate-like fins are provided radially to connect the fins 7 to 7, and the other aspects are the same as the embodiments shown in FIGS. 1 and 2.

With this configuration, the plate-like fins 15 function to easily transfer the recovered heat from the gravity heat pipe 10 to the air-fuel mixture introduced into the vaporization chamber 8 .

In addition, in the above, as the fins 15, the above-mentioned plate-shaped fins or porous metals such as sintered metals can be used.

FIG. 5 shows another embodiment of the invention. In the embodiment shown in this figure, the lower end of the gravity heat pipe 10 is attached to the side wall 1 of the combustion chamber 4, and the heater 9 is attached to the carburetor 7.
It is installed on the outer wall of. For other information, see Figures 1 and 2.
It has the same structure as the embodiment shown in the figure.

With this configuration, the gravity heat pipe 1
0 receives heat from burner 5, vaporization chamber 8 receives heat from heater 9
The heat received from the
Furthermore, the gravity heat pipe 10 and the heater 9 can be easily attached and detached.

FIG. 6 shows another embodiment of the invention. In this embodiment, the burner 5 is provided upward in the lower part of the combustion chamber 4, and the lower end of the gravity heat pipe 10 is connected to the vertical duct 1 between the combustion chamber 4 and the discharge port 6.
They are arranged in section 7 as shown in the figure. With this configuration, the gravity heat pipe 10 can eliminate the need for a bent portion.

〔Effect of the invention〕

As explained above, according to the present invention, the rise time at the time of burner ignition is significantly shortened, and the rise at the start of combustion can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional side view illustrating one embodiment of the combustion apparatus of the present invention, FIG. 2 is a sectional view taken along the line - in FIG. 1, and FIG. 3 illustrates another example of the combustion apparatus of the present invention. FIG. 4 is a cross-sectional view taken along the - line arrow in FIG. 3, and FIGS. 5 and 6 are cross-sectional side views illustrating still other examples of the combustion apparatus of the present invention. 1... combustion chamber side wall, 4... combustion chamber, 5... burner, 7... vaporizer, 8... vaporization chamber, 9... heater, 10... gravity type heat pipe, 15... plate-like fin.

Claims (1)

[Scope of Claims] 1. A combustion device having a combustion chamber in which a burner is disposed and a vaporizer for vaporizing fuel to be supplied to the burner, wherein the vaporizer is provided at a distance from a side wall of the combustion chamber to dissipate heat. A gravity heat pipe that transmits information in only one direction is arranged such that its upper end is on the side of the vaporizer and its lower end is inside the combustion chamber or a duct through which combustion exhaust gas passes, and the vaporizer is temporarily A combustion device characterized in that a heating means for heating is provided on the side of the vaporizer. 2. The upper end of the gravity heat pipe is disposed at a distance within the vaporization chamber of the vaporizer, and a fin member for connecting the upper end of the gravity heat pipe and the vaporizer is provided within the space. A combustion device according to claim 1. 3. The combustion device according to claim 2, wherein the fin member provided between the upper end of the gravity heat pipe and the vaporization chamber is a plate-shaped fin. 4. The combustion device according to claim 2, wherein the fin member provided between the upper end of the gravity heat pipe and the vaporization chamber is made of porous metal.