JPH0626616A - Combustion device - Google Patents

Abstract

PURPOSE:To reduce flame shutdown odor and noise in a combustion device such as a fan heater and an FF hot air heater and the like. CONSTITUTION:This combustion device is comprised of a burner case 11 covering a gasification cylinder 1 and forming a spacing between the gasification cylinder and itself, an air supplying pipe 12 fixed at a part opposing against an air feeding port 1a opened at a side wall of the gasification cylinder of the burner case, a nozzle holding pipe 13 cooperatively connected to the air supplying pipe, and a nozzle 20 passing through the nozzle holding pipe and located adjacent to the air feeding port. Then, the nozzle holding pipe, the air supplying pipe and the air feeding port of the gasification cylinder are arranged in a straight linear manner and at the same time the nozzle is coaxially located at a substantial central part of the air blowing passage. Accordingly, the nozzle can be effectively cooled, flame shutdown odor caused by an increased temperature at the nozzle can be substantially reduced and at the same time the air flow is also reduced in its resistance to enable an air whistling sound to be reduced and its noise can also be reduced. reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion device used for heating and heating fan heaters, FF warmers and the like.

[0002]

2. Description of the Related Art In a conventional heating device of this type, as shown in FIG. 3, a liquid fuel supplied from a nozzle 52 is vaporized into a vaporizing cylinder 51.
In addition to being vaporized by, the combustion air supplied from the air supply pipe 53 into the burner case 54 surrounding the outer periphery of the vaporizing cylinder is introduced into the vaporizing cylinder from the air inlet 51a opened on the side wall of the vaporizing cylinder, and The premixed gas was mixed and ejected from the flame port provided in the burner body 55 and burned.

However, in the above-described combustion apparatus, the air supply pipe 53 for supplying the combustion air and the nozzle 52 for supplying the fuel are separately fixed to the burner case 54, and the vaporization cylinder 51 is mounted in the burner case. It was a composition. This is to increase productivity by mechanically sequentially stacking the vaporization cylinder 51, the burner body 55 and the like in the burner case 54 to assemble them.

[0004]

However, in the above structure, since the nozzle 52 and the air supply pipe 53 are completely separate from each other, the nozzle cannot be cooled by the air for combustion, and the nozzle temperature is high. Has become. Therefore, especially when combustion is stopped, the temperature of the nozzle 52 suddenly rises, and the fuel remaining in the nozzle 52 thermally expands and drops into the vaporization cylinder 51 from its tip, or vaporizes as it is at the tip of the nozzle 52. By doing so, there is a problem in that it is thermally decomposed as unburned gas without being burned and is discharged to the outside of the body of the heating device, so that the extinguishing odor is severe.

Further, since the nozzle 52 is arranged at the air introduction port of the vaporization cylinder 51, the air supply pipe 53 is unavoidably attached to the side of the burner case 54.
As a flow path of air, the air supply pipe 53 once enters the burner case 54, and then the course is changed while hitting the side wall of the vaporization cylinder 51, and the air introduction port 5 of the vaporization cylinder 51 is changed.
It became a form to enter 1a. That is, since the resistance of the air path is large and the flow becomes turbulent, there is a problem of increasing the noise value of the device.

The present invention solves the above-mentioned conventional problems, and an object thereof is to reduce extinguishing odor and noise while maintaining good productivity.

[0007]

In order to achieve the above object, the present invention provides a vaporizing cylinder for vaporizing fuel and mixing it with air.
Burner that covers the vaporization cylinder and forms a space between the vaporization cylinder and the vaporization cylinder
A nozzle, an air supply pipe attached to a portion of the burner case facing the air introduction port opened on the side wall of the vaporization cylinder, a nozzle holding pipe having a hollow cross section connected to the air supply pipe, and the nozzle holding pipe. A nozzle that penetrates and faces the air introduction port of the vaporization cylinder, and the nozzle holding pipe, the air supply pipe, and the air introduction port of the vaporization cylinder are arranged linearly, and at the substantially central portion of the air blowing path. The nozzle is located coaxially.

[0008]

According to the present invention, the nozzle is located at a considerably long portion of the air supply pipe and the nozzle holding pipe by the above-mentioned constitution, and as a result, the nozzle is cooled by the combustion air and its temperature is greatly reduced. Moreover, since the nozzle itself is located inside the nozzle holding tube, radiation from the high temperature vaporization cylinder,
There is no conduction heat. Further, if the air supply pipe attached to the burner case is also made of a material having poor heat conductivity such as stainless steel, the conduction heat from the burner case is also cut, and the temperature of the nozzle can be further reduced. Therefore, by slightly supplying combustion air even when combustion is stopped, the temperature of the nozzle does not rise sharply and the odor is greatly reduced by eliminating the vaporization of fuel and the dropping of oil drops due to thermal expansion. .

Further, since the air flow path is also linear, the combustion air is supplied relatively smoothly into the vaporizing cylinder, and its air resistance is remarkably reduced, and wind noise can be reduced. Become.

[0010]

Embodiments of the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 1 is a bottomed cylindrical vaporization cylinder, and an air introduction port 1a is provided at a part of an eccentric position of a peripheral wall thereof.
2 is a heater embedded in the vaporization cylinder 1, 3 is a vaporization cylinder lid, 4
Is a porous resistance plate for premixing the fuel vaporized in the vaporization cylinder 1 and the primary air for combustion. Reference numeral 5 is a burner body having flame openings 6 formed on the peripheral wall. Reference numeral 7 denotes a perforated cylinder made of wire mesh or the like mounted on the peripheral wall of the burner body 5, and fixed to the burner body 5 by spot welding between the flame openings 6. Reference numeral 8 is a combustion cylinder provided around the burner body 5, which supplies secondary air for combustion from an opening 8a provided in the lower part to perform complete combustion and also has a role of heat shield. The combustion gas is mixed with convection air (not shown) at the upper part of the combustion cylinder 8 and becomes hot air from the blowout port of the device and is discharged to the outside of the device.

Now, the vaporization cylinder 1 is a bottomed cylindrical burner case 1.
1 has a structure in which an air layer is provided between the burner case 1 and the burner case to keep the temperature constant and to keep the temperature constant, and the coaxial position of the burner case 11 facing the vaporization cylinder air introduction port 1a. An air supply pipe 12 is bite and fixed to the. The end portion of the air supply pipe 12 is expanded to form a flange portion, and the nozzle holding pipe 13 is connected and fixed by a screw or the like. As the material of the air supply pipe 12, it is desirable to use stainless steel having a high heat insulating property such as SUS304 as described above. The nozzle holding pipe 13 connected to the air supply pipe 12 is usually a hollow pipe body formed by die casting or the like and bent at an obtuse angle as shown in FIG. 2, and is connected to the combustion blower 15 via the air hose 14. It is connected. Reference numeral 16 is a blower fan, 17 is a motor, and 18 is a casing, which is configured to take in combustion air from an air intake port 18a.

On the other hand, a rib 19 is provided on the bent portion of the nozzle holding tube 13, and a through hole is opened in this portion to insert the nozzle 20. The nozzle 20 is connected to an oil feed pipe 21 and connected to an oil feed pump 22. Further, a flange is provided in the middle of the oil supply pipe 21 by expanding the pipe, and the nozzle holding plate 13 is used by using the nozzle mounting plate 23.
It is fixedly held.

In the above structure, the fuel supplied to the inside of the vaporizing cylinder 1 through the nozzle 20 by the oil pump 22 is instantaneously vaporized in the vaporizing cylinder 1 which is heated to a high temperature by the heater 2, and the blower 15 It is premixed with the combustion air sent from the inside of the vaporization cylinder 1 through the nozzle holding pipe 13 and the air supply pipe 12. The premixed vaporized gas passes through the vaporization cylinder lid 3 and the resistance plate 4 while swirling in the vaporization cylinder 1, jets to the inner wall of the burner body 5, and jets from the flame port 6 of the outer peripheral wall. When this vaporized gas is ignited by a spark discharger (not shown) or the like, combustion is started to form a flame that is substantially in contact with the perforated cylinder 7 around the flame nozzle 6.

Here, since the combustion air flowing through the nozzle holding pipe 13 and the air supply pipe 12 is co-located with the nozzle 20 and the oil feed pipe 21 by 50 mm or more in this embodiment, it is always cooled. Will be done. That is, in the case of the conventional device shown in FIG. 3, the temperature of the nozzle inevitably rises because there is only a slight cooling effect by the air flow, but it is possible to more reliably perform cooling as compared with this. According to the experiments, in the conventional example, the temperature of the nozzle immediately after extinguishing was as high as 60 to 80 ° C, but according to this configuration, it is possible to reduce it to 40 ° C.
The odor of unburned gas generated immediately after extinguishing could be reduced by preventing vaporization of kerosene remaining at 0 and dripping due to thermal expansion. For example, when the value of HC (hydrocarbon) near the outlet 9 is measured as a substitute characteristic for extinguishing odor, the value (peak value of HC generation) is reduced to 60% of the conventional one, and the generation time is from 5 minutes. The fire extinguishing odor could be clearly reduced by shortening it to 4 minutes.

Regarding the noise during combustion, since the air flow becomes smoother and moreover becomes a laminar flow due to the linearization of the flow path, it is possible to reduce the wind noise that is annoying when heard. , Noise level 0.3-0.5
The noise value of dB could be reduced.

[0016]

As is apparent from the above description of the embodiments of the present invention, according to the present invention, an air supply pipe is attached to a burner case, a nozzle holding pipe is connected to the air supply pipe to attach a nozzle, and the nozzle holding pipe and the air are connected. Since the supply pipe and the air inlet of the vaporization cylinder are arranged linearly, and the nozzle is coaxially positioned in the approximate center of the air blowing path, the nozzle is effectively cooled while maintaining good productivity. As a result, the fire extinguishing odor due to the temperature rise of the nozzle can be significantly reduced, the air flow also has a low resistance, the wind noise can be reduced, and the noise is also reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a combustion apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view of the same when cut in the horizontal direction.

FIG. 3 is a sectional view of a conventional combustion device.

[Explanation of symbols]

 1 Vaporizing Cylinder 1a Air Inlet 11 Burner Case 12 Air Supply Pipe 13 Nozzle Holding Pipe 20 Nozzle

Front page continued (72) Inventor Takashi Nishikawa 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A vaporization cylinder for vaporizing fuel to mix with air, a burner case forming a space between the vaporization cylinder and the vaporization cylinder, and a burner case opened on the side wall of the vaporization cylinder. An air supply pipe attached to a portion facing the air inlet,
A nozzle holding pipe having a hollow cross section connected to the air supply pipe; and a nozzle penetrating the nozzle holding pipe and facing the air inlet of the vaporization cylinder, and the nozzle holding pipe, the air supply pipe and the vaporization A combustion device in which the air inlets of the cylinders are arranged in a straight line, and the nozzles are coaxially positioned approximately in the center of the air flow path.