JPH08121721A - Combustion device - Google Patents

Abstract

PURPOSE: To once keep temperature of a vaporizer high at all times in a combustion device equipped inside a burner-case with a blower for feeding secondary air by interposing a heat-shield guide member between the vaporizer and the burner-case in order for the secondary air not to flow directly about the periphery of the vaporizer. CONSTITUTION: In a combustion device equipped with a blower 16 which feeds secondary air into a burner-case 14 through a secondary-air-feeding pipe 15, a heat-shield plate 22 is provided between a vaporizer 1 and the peripheral wall 14B of the burner-case 14 in a manner of enclosing the vaporizer 1 at its periphery. Fixing parts at the lower end of this heat-shield plate 22 are spot-welded to the bottom wall 14A of the burner-case 14. Furthermore a blow guide 23 is provided in a manner of covering the outlet 15A of the secondary-air- feeding pipe 15. As a result, secondary air A flowing from the outlet 15A is directed sideways by the blow guide 23 and sent between the heat-shield plate 22 and the peripheral wall 14B without directly touching the peripheral wall of the vaporizer 1.

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 an oil fan heater, an oil warm air heater, etc., for vaporizing and burning liquid fuel.

[0002]

2. Description of the Related Art The structure of a combustion device of this type is shown in FIGS.
Shown in

In FIG. 6, reference numeral 1 denotes a die-cast molded bottomed cylindrical vaporizer, and an electric vaporization heater 2 for heating the vaporizer 1 is embedded in an upper portion of a peripheral wall of the vaporizer.

The carburetor 1 is heated by energization of the vaporization electric heater 2, but since the heat of the flame is heated back after ignition, the carburetor 1 is maintained at a high temperature even when the energization is stopped.

An air nozzle portion 3 is provided on the peripheral wall of the carburetor 1, and a blower tube 4 for supplying the primary air B into the carburetor 1 is connected to the air nozzle portion 3. A fuel nozzle 5 is attached to the center of the blower tube 4, and the tip of the fuel nozzle 5 is projected through the air nozzle portion 3 into the carburetor 1. on the other hand,
The other end of the fuel nozzle 5 is connected to the fuel tank 1 via an oil supply pipe 21.
7, an electromagnetic pump 18 for pumping up the liquid fuel in the fuel tank 17 and sending it to the fuel nozzle 5 is provided on the way. The liquid fuel sent by the electromagnetic pump 18 is jetted from the tip of the fuel nozzle 5, is vaporized by the heat of the vaporizer 1, is mixed with the primary air B supplied from the blower 16 through the blower tube 4, and is mixed gas. Becomes

Reference numeral 6 is a diaphragm plate having a throttle passage 6A in the center, which is attached to the upper part of the carburetor 1, and a baffle plate 7 is provided below the diaphragm passage 6 so as to face the throttle passage 6A. A burner head 8 is attached to the upper end opening of the carburetor 1, a large number of vent holes 9 are provided in the bottom wall portion 8A of the burner head 8, and a large number of flame holes 10 are provided in the peripheral wall portion 8B thereof. The perforated wire mesh 11 is provided inside and outside the peripheral wall portion 8B.

Reference numeral 12 denotes an annular burner ring for heating the heat from the flame holes 10 back to the vaporizer 1, which is mounted on the upper end of the vaporizer 1 so as to surround the burner head 8. A large number of vertical slits 13 are provided on the annular standing wall 12A of the burner head 8 facing the flame holes 10.

Reference numeral 19 is an ignition rod for igniting the mixed gas ejected from the flame holes 10 of the burner head 8, and reference numeral 20 is a frame rod for detecting the flame.

Reference numeral 14 designates a bottomed cylindrical burner case provided on the outer periphery of the carburetor 1, and an upper end outlet 15A of a secondary air supply pipe 15 is connected to the bottom wall 14A so that the blower 1
Secondary air A is supplied into the burner case 14 from 6 through the secondary air supply pipe 15. The supplied secondary air A flows between the carburetor 1 and the peripheral wall 14B of the burner case 14 into the upper burner ring 12, and satisfactorily burns the mixed gas ignited by the ignition rod 19.

[0010]

However, when a liquid fuel having a high evaporation temperature is used, the temperature of the carburetor 1 must be further increased in order to obtain good combustion, which is clear from the above description. In the carburetor 1, the secondary air A from the secondary air supply pipe 15 directly flows into the outer periphery of the carburetor 1 and comes into contact with the peripheral wall.
Since the carburetor 1 is cooled by and the temperature of the carburetor 1 itself cannot be maintained at a high temperature and constant, the vaporized fuel ejected from the fuel nozzle 5 becomes difficult to vaporize, and unburned gas accumulates to generate an odor. Doing so may cause red fire burning and tar adhesion.

The object of the present invention is to solve the above-mentioned drawbacks and to keep the temperature of the carburetor 1 at a high temperature all the time, so that there is no abnormal combustion and no tar adhesion, and the liquid fuel having a high evaporation temperature has a good performance. It is to provide a combustion device.

[0012]

That is, according to the present invention, a burner head that burns a mixed gas, a vaporizer that gasifies liquid fuel, a burner case that surrounds the vaporizer, and a burner case are provided. In a combustion device equipped with a secondary air supply pipe opened at the bottom of the and a blower for supplying the secondary air into the burner case through the secondary air supply pipe, the secondary air is directly carburetor. A heat shield guide member was interposed between the vaporizer and the burner case so as not to flow into the outer periphery of the.

Further, according to the present invention, a burner head for burning a mixed gas, a vaporizer for gasifying liquid fuel, a burner case provided so as to surround the vaporizer, and a burner case opened at the bottom of the burner case. In a combustion device equipped with a secondary air supply pipe and a blower that supplies secondary air into the burner case through the secondary air supply pipe, prevent the secondary air from directly flowing into the outer periphery of the carburetor. Between the carburetor and the burner case, a heat shield plate which is erected from the bottom wall of the burner case so as to surround the outer periphery of the carburetor, and secondary air flows between the heat shield plate and the burner case. In addition, a heat shield guide member composed of a blower guide with one end opening provided at the outlet of the secondary air supply pipe is interposed.

[0014]

[Operation] With the above configuration, in the present invention, since the heat shield guide member is interposed between the vaporizer and the burner case, the secondary air does not flow directly into the outer periphery of the vaporizer, and the temperature of the vaporizer is high. Is kept constant.

That is, the secondary air flowing out from the outlet of the secondary air supply pipe is turned laterally by the blower guide so as to flow between the heat shield plate and the peripheral wall of the burner case.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a sectional view showing a structure of a combustion apparatus according to the present invention, FIG. 2 is a plan sectional view of the combustion apparatus, FIG. 3 is an external perspective view of a heat shield plate, and FIG. 4 is a blower attached to the combustion apparatus. A cross-sectional view of the guide and the secondary air supply pipe, and FIG. 5 is an external perspective view of the blower guide.

The combustion apparatus according to the present invention is the conventional combustion apparatus shown in FIGS. 6 and 7, provided with a heat shield guide member 24 composed of a heat shield plate 22 and a blower guide 23, which will be described later. The structure is the same as that of the conventional type, and the structure of the heat shield guide member 24, which is a feature of the present invention, will be described below.

1 and 2, reference numeral 22 denotes a heat shield plate, which is provided between the carburetor 1 and the peripheral wall 14B of the burner case 14 so as to surround the outer periphery of the carburetor 1. The heat shield plate 22 has a semi-broken cylindrical shape as shown in FIG. 3, and the fixing portion 22 A provided at the lower end portion has a bottom wall 14 of the burner case 14.
Spot welded to A.

Reference numeral 23 in FIG. 2 is a blower guide which is attached so as to cover the outlet 15A of the secondary air supply pipe 15. The blower guide 23 is a U-shaped guide having one end opened as shown in FIG. 5, and the opening is the heat shield plate 2.
It is fixed to the bottom wall 14A of the burner case 14 so as to face the direction of 2. Therefore, as shown in FIG. 4, the outlet 15A
The secondary air A that has flowed out of the air is changed in the direction to the side by the blower guide 23, so that the heat shield plate 22 and the peripheral wall 14B of the burner case 14 do not come into direct contact with the peripheral wall of the carburetor 1 as shown by the arrow in FIG. In between.

That is, in this embodiment, the heat shield guide member 24 is provided around the vaporizer 1 so that the vaporizer 1 is not cooled by the secondary air A from the secondary air supply pipe 15. Is configured to be fed between the heat shield plate 22 and the peripheral wall 14B of the burner case 14, and the temperature of the carburetor 1 is kept high and constant. Therefore, the vaporizer 1 is always maintained at a high temperature of about 350 to 400 ° C. by the vaporization electric heater 2 at the start of operation and by heat back of the flame after the combustion is started, and therefore, when liquid fuel having a high evaporation temperature is used. However, good combustion is obtained, and abnormal combustion and tar adhesion are prevented.

Further, in the present embodiment, an example in which the semi-broken cylindrical heat shield plate 22 is provided around the vaporizer has been described, but the present invention is not limited to this, and the vaporizer 1 is directly attached to the vaporizer 1 with a heat insulating material or the like. You may make it a structure to wrap.

[0023]

As described above, according to the present invention,
A burner head for burning the mixed gas, a vaporizer for gasifying the liquid fuel, a burner case provided so as to surround the vaporizer, a secondary air supply pipe opened at the bottom of the burner case, and In a combustion device equipped with a blower that supplies secondary air into the burner case via a secondary air supply pipe, in the vaporizer and the burner case so that the secondary air does not directly flow into the outer periphery of the vaporizer. Since the heat shield guide member is interposed therebetween, the vaporizer is not directly cooled by the secondary air, and the temperature of the vaporizer is always maintained at a high temperature. As a result, abnormal combustion and adhesion of tar are eliminated, good combustion can be obtained, and liquid fuel with high vaporizability can be used.

[Brief description of drawings]

FIG. 1 is a sectional view showing a configuration of a combustion apparatus according to the present invention.

FIG. 2 is a plan sectional view of the same combustion apparatus.

FIG. 3 is an external perspective view of a heat shield plate of the combustion device.

FIG. 4 is a cross-sectional view of a blower guide and a secondary air supply pipe attached to a combustion device.

FIG. 5 is an external perspective view of a blower guide of the combustion device.

FIG. 6 is a cross-sectional view showing a configuration of a conventional combustion device.

FIG. 7 is a plan sectional view of the same combustion apparatus.

[Explanation of symbols]

 1 Vaporizer 8 Burner head 14 Burner case 14A Burner case bottom wall 15 Secondary air supply pipe 15A Secondary air supply pipe outlet 16 Blower 22 Heat shield plate 23 Blower guide 24 Heat shield guide member A Secondary air

Claims (2)

[Claims] 1. A burner head for burning a mixed gas,
A vaporizer for gasifying liquid fuel, a burner case provided so as to surround the vaporizer, a secondary air supply pipe opened at the bottom of the burner case, and the burner via the secondary air supply pipe. In a combustion device equipped with a blower for supplying secondary air into the case, a heat shield guide member is interposed between the vaporizer and the burner case so that the secondary air does not directly flow into the outer periphery of the vaporizer. Combustion device characterized by 2. A burner head for burning a mixed gas,
A vaporizer for gasifying liquid fuel, a burner case provided so as to surround the vaporizer, a secondary air supply pipe opened at the bottom of the burner case, and the burner via the secondary air supply pipe. In a combustion device equipped with a blower for supplying secondary air into the case, the secondary air is vaporized from the bottom wall of the burner case between the vaporizer and the burner case so that the secondary air does not directly flow into the outer periphery of the vaporizer. A heat shield plate raised to surround the outer periphery of the vessel, and a blower guide of one end opening provided at the outlet of the secondary air supply pipe so that secondary air flows between the heat shield plate and the burner case. Combustion device characterized by interposing a heat shield guide member constituted by.