JPS5844277Y2 - gas hot air machine - Google Patents

Description

[Detailed description of the invention] This invention relates to a gas warm air machine that generates complete combustion by supplying fuel gas at a supply pressure such as cloth gas or propane gas by adjusting it to an arbitrary pressure using a cock etc. A gas hot-air blower in which a bottomed gas combustion tube with a slightly narrower diameter is arranged almost concentrically within the generation tube, with the bottom wall facing backward, and an annular ventilation passage formed between the iron tube and the inner circumference of the hot-air generation tube. A window hole is formed in the center of the bottom wall, and a plurality of guiding plates having a constant inclination angle with respect to a radius line are provided between the wind shield plate provided at the rear of the bottom wall and the periphery of the window hole. are arranged and fixed in a ring shape, and a large number of combustion gas feed pipes, each of which is inserted into the wind shield plate from the rear side and whose end surface is closed, protrudes from the center of the guide plate arranged in the ring shape and is provided around the guide plate. A blower fan is provided with a gas outlet facing the inner edge of each guide plate, and further inside the warm air generation tube behind the wind shield plate, the blower fan is arranged to send some of the air from between the guide plates to the window hole by swirling the air. It is characterized by the fact that it has been installed.

In the conventional hot air generator, as shown in FIG. bottom wall 54 of
An annular ventilation passage 52 is formed between the combustion tube 53 and the inner periphery of the hot air generating tube 51, and a blower driven by a motor 57 is provided behind the bottom wall 54 inside the hot air generator 51. The structure with a wind fan 56 is published in 1977.
This is disclosed in Japanese Patent No. -35942.

However, in the above case, the motor 57 is installed coaxially with the blower fan 56.
A vane type air compressor 58 driven by
The air compressed by 8 is fed into the gas combustion cylinder 53,
Compressed air injected from the outer periphery of the tip of a fuel nozzle 60 for supplying liquid fuel inserted into a nozzle housing 55 protruding rearward from the rear side wall 54 forcibly attracts liquid fuel and gasifies it into the combustion tube 53. The mixture is mixed by the installed funnel-shaped guide vane 61 and sent into the gas combustion tube 53, and the combustion exhaust gas burned in the gas combustion tube 53 is discharged to the outside through the annular ventilation passage 52. The fuel is extracted from the outlet of the gas combustion cylinder 53 by a relatively high-velocity heated air flow, but it cannot supply fuel without the vane type air compressor 58.
Gas that uses gas fuel that is suitable for forcibly sending liquid fuel into the combustion cylinder from a fuel nozzle and vaporizing or atomizing it into a gaseous state, but has a pressure that allows the feeding amount to be adjusted arbitrarily with a cock etc. It is impossible to use it for hot air.

The present invention is suitable for combustion of gas in cloth, propane gas, etc., and also allows combustion air to be mixed using a unique structure.

In conventional hot air generators, the bottomed gas combustion tube is arranged almost concentrically inside the front part of the hot air generation tube, and the bottom wall of the combustion tube is directed toward the rear. A structure having an annular ventilation passage between the inner peripheries and a blower fan driven by a motor installed behind the bottom wall inside the hot air generating tube is disclosed in Japanese Patent Laid-Open No. 47-35942. Disclosed.

However, in the above method, a vane type air compressor driven by a motor together with a blower fan is installed behind the bottomed gas combustion tube.
Air compressed by the compressor is injected from the outer periphery of the fuel nozzle into the combustion tube of the gas combustion tube to forcibly inject liquid fuel into the combustion tube. The mixture is mixed by a funnel-shaped guide vane installed in the gas combustion cylinder and sent into the gas combustion cylinder,
The combustion exhaust gas burned in the gas combustion tube is extracted from the outlet of the gas combustion tube by a relatively high-velocity heated air flow that is discharged to the outside through the annular ventilation passage mentioned above. It is suitable for forcibly sending liquid fuel from a fuel nozzle into the combustion cylinder and vaporizing or atomizing it into a gaseous state, but the feeding amount can be adjusted arbitrarily. It is impossible to use it in a gas hot air fan that uses gas fuel with the pressure that it allows.

An embodiment of the present invention will be described with reference to the accompanying drawings.

In the figure, reference numeral 1 denotes a hot air generation tube with both ends open, the rear end opening serving as a combustion air intake port 2, and the tip opening serving as a hot air supply port 3 that is slightly constricted in the radial direction.

Reference numeral 4 denotes a gas combustion tube formed in a bottomed shape, the outer circumference of which is slightly narrower than the inner diameter of the hot air generation tube 1, and the comb is concentrically slightly inside the hot air supply port 3 of the generation tube 1. Place the second
．． As shown in FIG. 3, it is attached using a large number of spacer plates 19.

The bottom wall 5 of the gas combustion tube 4 facing rearward in the hot air generating tube 1 is provided with a circular window hole 6 of a considerably large diameter at the center, which is concentric with the rear surface of the bottom wall 5 at a fixed interval behind it. A plurality of guide plates 8 having an approximately constant angle of inclination θ in the same direction with respect to the radius line a-a of the combustion tube 4 are arranged between the wind shield plate 7 of a slightly smaller diameter and arranged in the combustion tube 4. The guide plates 8 are arranged and fixed in an annular shape as shown in FIG. An acceleration turning imparting member 10 is formed by the front surface of the wind shield plate 7, each guide plate 8 having the center 9, and the circular window hole 6 in the bottom wall 5.

Reference numeral 11 denotes a combustion gas supply pipe which is inserted concentrically from the outside of the hot air generation pipe 1 into the inside and then passed through the center 9 behind the wind shield plate 7. A large number of gas ejection holes 12 are bored between the inner edges 8a of the guide plate 8.

An annular ridge 13 is provided on the inner periphery of the tip of the gas combustion tube 4, and a flame plate 14 having a diameter that closely matches the inner periphery of the ridge 13 is placed on the opening at the tip and is attached using mounting legs 15. .

The inside of the hot air generating tube 1 between the back of the above-described air shield 7 and the combustion air intake port 2 is a forced ventilation section 16, and a blower fan 18 driven by a motor 17 is attached to the ventilation section 16.

An annular ventilation passage 20 is formed between the inner periphery of the hot air generating tube 1 and the outer periphery of the gas combustion cylinder 4.

To explain the operation of the above embodiment, a part of the forced draft sent from the forced draft section 16 toward the gas combustion tube 4 due to the rotation of the ventilation fan 18 is distributed between each guide plate 8 on the front side of the wind shield plate 7. It passes through and enters the center 9 where the inner edge 8a is arranged in an annular manner.

Each of the guide plates 8 is arranged along the radius line a-a of the gas combustion cylinder 4.
Since the inclination angle θ is attached to the forced draft, a spiral swirl (spin) is generated in the forced draft according to the tilt angle of each guide plate 8, and the spiral draft based on the swirl is directed in the centripetal direction. When the gas flows into the center 9, it accelerates, turns at high speed around the combustion gas feed pipe 11 as shown by the arrow in FIG. 4, and enters the gas combustion cylinder 4 through the circular window hole 6.

Therefore, the combustion gas ejected from the gas ejection holes 12 around the feed pipe 11 is stirred by the high-speed swirling vortex air flow and becomes well mixed, and the resulting mixed gas flow is transferred to the gas combustion tube 4. Fill inside.

Therefore, if this is ignited from the tip of the iron cylinder, complete combustion will occur due to sufficient mixing of combustion air, and the combustion exhaust will pass through the hot air supply port 3 between the periphery of the flame plate 14 and the flange 13. and leak to the outside.

On the other hand, a part of the forced air sent by the blower fan 18 passes through the annular air passage 20 to cool the gas combustion cylinder 4, and the cooling causes heat exchange, and the heated air flows out from the hot air supply port 3. However, as is well known, there is a flame plate 14 at which the combustion exhaust exits.
Since the flow velocity of the air stream heated by the gas combustion tube 4 while passing through the annular ventilation passage 20 is faster than the velocity of air being discharged from the outer periphery of the air, the combustion exhaust gas is sucked by the inject action and is then discharged from the hot air supply port 3. This relatively increases the amount of air flow that is sucked out to the outside and enters the center 9 from between each guide plate 8 accordingly.

Therefore, even if the amount of fuel gas ejected from the gas nozzle 12 is increased, the amount of combustion air and warm air sufficient for complete combustion will be sufficient to enter the gas combustion tube 4, and a large amount of hot air will be supplied to the hot air supply port. 3
Send from.

As clarified from the above explanation, the present invention directs a part of the airflow sent by the blower fan 18 between the bottom wall 5 of the gas combustion cylinder 4, which has the window hole 6 in the center, and the wind shield plate 7. Air is fed between the guide plates 8 which are arranged in an annular manner with an inclination angle giving a spiral swirl, and the swirl air flow generated by each guide plate causes the gas to flow from the gas jet hole 12 of the combustion gas feed pipe 11 in the circumferential direction. The fuel gas jetted out is mixed and stirred, and the resulting vortex swirling mixture flow is sent into the gas combustion cylinder 4 through the window hole 6 to create a unique air-fuel mixture that completes combustion. The gas is generated in the gas combustion cylinder 4 due to the injection action of the linear air flow of the known annular ventilation passage 20, which has low vortex resistance and increases the flow velocity by exchanging heat with the combustion cylinder 4 and increasing the flow velocity. This device sucks in combustion exhaust gas and causes it to flow outside. Even if the amount of fuel gas ejected from the gas nozzle 12 is increased, it is possible to supply combustion air that is sufficient for complete combustion, thereby generating warm air. A large amount of hot air can be discharged from the hot air supply port 3 of the pipe 1.

[Brief explanation of the drawing]

The attached drawings show one embodiment of the present invention, in which Fig. 1 is a cutaway side view, Fig. 2 is a rear view taken along line A-A in Fig. 1, and Fig. 3 is a cutaway view taken along line B of Fig. 1.
4 is an enlarged explanatory view of a part of FIG. 2, and FIG. 5 is a longitudinal sectional side view of the known device. 1 → hot water hot air pipe, 4 → gas combustion cylinder, 5 → bottom wall, 6 → window hole, 7 → wind shielding plate, 8 → guide plate, 11 → combustion gas feed pipe, 1
2→Gas outlet, 16→Forced ventilation section, 18→Blower fan, 2
0 → Circular ventilation duct.

Claims (1)

[Scope of utility model registration request] Inside the hot air generating tube 1, a bottomed gas combustion tube 4 with a slightly narrower diameter is arranged almost concentrically, with its bottom wall 5 facing backward, and an annular shape is formed between the iron tube 4 and the inner circumference of the hot air generating tube 1. In the gas hot air fan having the ventilation passage 20, a window hole 6 is formed in the center of the bottom wall 5, and a radius is formed between the wind shielding plate 7 provided at the rear of the bottom wall 5 and the periphery of the window hole 6. A plurality of guide plates 8 having a constant inclination angle with respect to the line a are arranged and fixed in an annular shape, and a combustion gas feed pipe 11 with a closed end face is inserted into the wind shield plate 7 from the rear side and is arranged in the annular shape. A large number of gas jet ports 12 protruding from the center of the array of guide plates 8 and provided around the circumference thereof are arranged to face the inner edge 8a of each guide plate 8, and furthermore, a wind shield plate 7 is provided within the hot air generating tube 1. on the rear side of
A part of the air is swirled between the guide plates 8 and the window holes 6
This gas hot air fan is equipped with a blower fan 18 that sends some air into the annular ventilation passage 20 and at the same time sends some air into the annular ventilation passage 20.