JPH1114037A - Combustion apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure combustion air even when an air filter is blocked with a foreign matter by providing an air bypass passage in a fitting part of an air filter and an air inlet of a combustion air blower in a combustion apparatus having the air filter installed in the air inlet of the combustion air blower. SOLUTION: In a combustion apparatus such as oil burning heater wherein a vaporized liquid fuel and air are premixed and burned, combustion air is taken through an air inlet 5 through an air filter 6 by operating a combustion air blower. In this case, a plurality of grooves 6c are formed in an inner circumferential face of a fitting cylinder part 6a of the air filter 6 in an axial direction. A bypass passage for taking air from an interior of a main body case 15 is formed in the state wherein the air filter 6 is fitted to an outer circumferential face of a large-diameter part 5a formed at an end of the air inlet 5. Therefore, even when the air filter 6 is blocked for some reason or other, combustion air can be secured and abnormal combustion of the combustion apparatus is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus for premixing and burning a vaporized liquid fuel and air.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view showing the structure of a conventional combustion device.

In FIG. 4, reference numeral 1 denotes a vaporizer for forming a chamber for vaporizing a liquid fuel and mixing it with combustion air;
Reference numeral 2 denotes an electric heat heater buried in the side wall of the vaporizer 1 for heating the vaporizer 1, reference numeral 3 denotes a burner head provided above the vaporizer 1, and reference numeral 4 denotes a vaporizer which takes in combustion air from outside. 1
The air blower is supplied to an air filter 5 for preventing foreign substances from entering the combustion section.
Is installed. 7 is an air supply pipe for sending air from the combustion blower 4 to the carburetor 1, 8 is an electromagnetic pump for supplying liquid fuel to the carburetor 1, and this electromagnetic pump 8 has one end located in the fuel tank 9. The other end is connected to the fuel supply pipe 10.

[0004] Reference numeral 11 denotes a combustion flame formed above the burner head 3, and reference numeral 12 denotes a combustion cylinder, which is provided so as to surround the periphery of the upper portion of the burner head 3. 13 is a wind tunnel, 14 is a convection fan installed on the back of the main body case 15,
Reference numeral 16 denotes a warm air outlet louver provided on the front panel 17, reference numeral 18 denotes a bottom plate, and reference numeral 19 denotes a case top plate.

Next, the operation of the conventional apparatus having the above configuration will be described. First, by energizing the electric heating heater 2, the vaporizer 1 is preheated to a temperature required for vaporizing the liquid fuel. After the completion of the preheating, combustion air is taken in from the air intake 5 through the air filter 6 by the operation of the combustion blower 4 and supplied to the vaporizer 1 through the air supply pipe 7. The liquid fuel in the fuel tank 9 is pumped up by the operation of the electromagnetic pump 8 and supplied to the carburetor 1 through the fuel supply pipe 10. The liquid fuel is instantaneously vaporized in the preheated vaporizer 1 and mixed with the combustion air to become a flammable premixed gas. At that time, the combustion air and the vaporized fuel are supplied such that the air ratio (= supply air amount / theoretical air amount) becomes about 0.8 to 1.0. The premixed gas is ignited by an igniter (not shown) on the burner head 3 and a combustion flame 11
And burns in the space inside the combustion tube 12.

The combustion flame 11 is confirmed by a flame detector (not shown), and stops the combustion in the event of abnormal combustion (such as a decrease in the air ratio due to a decrease in combustion air).

The combustion gas burned in the combustion tube 12 mixes with the air blown from the convection fan 14 installed on the back of the main body case 15 at the upper part of the combustion tube 12 in the wind tunnel 13 and the front. Hot air outlet louver 1 provided on panel 17
Exhausted from 6.

FIG. 5 is a cross-sectional view of an air-filter mounting portion in a conventional combustion device.

As shown in FIG. 5, the air intake 5 of the combustion blower 4 is located inside the main body case 15, and has an air filter having a mesh portion 6a at the large end diameter portion 5a.
6 is detachably fitted from the outside of the main body case 15. Here, the air filter 6 is detached from the air inlet 5 to facilitate cleaning when dust or dirt adheres to the mesh portion 6a.

[0010]

Since the conventional combustion apparatus is constructed as described above, the air filter 6 installed in the air intake 5 of the combustion blower 4 is provided with a foreign substance (car).
If the flame is temporarily blocked by a gas, the supply of combustion air is reduced, and the flame detector detects an abnormality, thereby stopping the combustion.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and in a case where an air filter is temporarily blocked by a foreign matter, combustion air is secured to prevent abnormal combustion. The aim is to obtain a combustion device.

[0012]

SUMMARY OF THE INVENTION A combustion apparatus according to the present invention includes a combustion blower for supplying combustion air to a combustion section, and an air filter provided at an air intake of the combustion blower. In the apparatus, an air bypass is provided at a fitting portion between an air intake of the combustion blower and an air filter.

Further, in the combustion apparatus according to the present invention, the bypass passage is provided inside the main body case to suck air inside the main body.

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Hereinafter, Embodiment 1 of the combustion device according to the present invention will be described in detail. FIG. 1 is a cross-sectional view of an air-filter-mounting portion showing a first embodiment of a combustion device according to the present invention.

In FIG. 1, the same reference numerals as those of the above-mentioned conventional device indicate the same or corresponding parts, and therefore the description thereof will be omitted. Reference numeral 6c denotes a concave groove formed in the inner peripheral surface of the fitting cylindrical portion 6b of the air filter 6 at several locations in the axial direction. The groove 6 c is fitted in the outer peripheral surface of the large-diameter portion 5 a formed at the tip of the air inlet 5, and is in a direction opposite to the direction of the normal suction air flow, that is, from the inside of the main body case 15. To form a bypass path for taking in air. The air intake 5 of the combustion blower 4 is located inside the main body case 15. Thus, since the air bypass path was formed by providing the concave groove 6c on the inner peripheral surface of the fitting cylindrical portion 6b of the air filter 6, the mesh portion 6a of the air filter 6 was temporarily closed by the foreign matter. In such a case, the air inside the main body can be sucked from the bypass passage formed by the concave groove 6c and the combustion air can be secured, so that the occurrence of abnormal combustion can be suppressed, and the stop of combustion can be prevented before it occurs. Further, since the air taken in from the bypass path is sucked from the inside of the main body case 15, there is no suction of dust and the like, and there is no fear of foreign matter entering the combustion part such as the vaporizer 1.

Embodiment 2 FIG. 2 is a cross-sectional view of an air filter mounting part showing Embodiment 2 of the combustion apparatus according to the present invention. Embodiment 2
1 shows an air bypass formed by forming several grooves 5b in the axial direction on the outer peripheral surface of the large-diameter portion 5a of the distal end of the air inlet 5. In the state where the fitting tube portion 6b of the air filter 6 is fitted, the concave groove 5b has a direction opposite to the direction of the normal suction air flow, that is, the body case 15
A bypass is formed to take in air from inside.
As described above, even in the configuration shown in the second embodiment, when the mesh portion 6a of the air filter 6 is temporarily closed by the foreign matter, the combustion air can be secured through the concave groove 5b, so that abnormal combustion can be achieved. Can be prevented and the stop of combustion can be prevented beforehand. Further, since the air taken in from the concave groove 5b is sucked from the inside of the main body case 15, there is no suction of dust or the like, and there is no fear of foreign matter entering the combustion part.

Embodiment 3 FIG. 3 is a sectional view of an air-filter-mounting portion showing a third embodiment of the combustion device according to the present invention.

According to the third embodiment, a plurality of ventilation holes 5c are provided in a large-diameter portion 5a formed at the end of an air intake port 5 of a combustion blower 4 so that the direction of a normal suction air flow can be improved. In other words, a bypass path for taking in air from the inside of the main body case 15 is formed. Also in the configuration shown in the third embodiment, when the mesh portion 6a of the air filter 6 is temporarily closed by foreign matter, combustion air can be secured through the ventilation hole 5c, and occurrence of abnormal combustion is suppressed. Thus, it is possible to prevent the combustion from stopping. In addition, since the air taken in from the ventilation hole 5c is sucked from the inside of the main body case 15, there is no suction of dust or the like, and there is no fear of foreign matter entering the combustion part.

[0018]

As described above, in the combustion apparatus according to the present invention, since the air bypass is formed at the fitting portion between the air intake of the combustion blower and the air filter, the air filter is made of foreign matter. Even if it is blocked, combustion air can be secured from the bypass, and the effect of preventing combustion from being stopped due to abnormal combustion can be obtained.

In the combustion apparatus according to the present invention, since the air sucked from the bypass passage is sucked from the inside of the main body case, there is obtained an effect that there is no suction of dust or the like and there is no fear of foreign matter entering the combustion part.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an air-filter mounting portion of a combustion device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of an air-filter mounting portion of a combustion device according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of an air-filter mounting portion of a combustion device according to a third embodiment of the present invention.

FIG. 4 is a cross-sectional view showing the configuration of a conventional combustion apparatus of this type.

FIG. 5 is a cross-sectional view of an air-filter mounting portion in a conventional combustion device.

[Explanation of symbols]

1 vaporizer, 4 blower for combustion, 5 air intake, 5a
Large diameter part, 5b concave groove, 5c ventilation hole, 6 air filter, 6a mesh part, 6b fitting cylinder part, 6c concave groove, 15 main body case.

Claims (2)

[Claims] 1. A combustion apparatus comprising: a combustion blower for supplying combustion air to a combustion section; and an air filter installed at an air intake of the combustion blower, wherein an air intake of the combustion blower is provided. A combustion device characterized in that an air bypass passage is formed in a fitting portion between the air filter and the air filter. 2. The combustion apparatus according to claim 1, wherein the bypass passage is provided inside the main body case to suck air inside the main body.