JPS5826487B2 - liquid fuel combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid fuel combustion device that vaporizes and burns liquid fuel, and particularly relates to a liquid fuel combustion device that prevents vaporized vapor and fuel from leaking from a vaporizer.

FIG. 1 shows a conventional liquid fuel combustion device.

In the figure, 1 is a combustion blower, 2 is a combustion tube, 3 is a carburetor supported by the combustion tube or the casing of the combustion blower 1, 4 is a burner attached to one end of the carburetor 3, and 5 is a combustion blower.
is a carburetor fixing screw, 6 is a mounting plate of the carburetor 3, 7 is a backing interposed between the carburetor 3 and the mounting plate 6, and 8 is a blower 1 from the air inlet end of the carburetor 3 on the side opposite to the burner 4. An air guide plate 9 is arranged on the side of the blower fan 1b and fixed inside the casing of the blower 1;
10 is a fuel supply pipe, 11 is an atomizer attached to
1 is a heater for heating the carburetor 3; 12 is a guide for guiding the air-fuel mixture; and 13 is a backing for sealing between the combustion blower 1 and the combustion tube 2.

A conventional liquid fuel combustion device composed of the above parts is
Fuel is supplied from the supply pipe 10 to the atomizer 9 in the vaporizer 3 heated by the heater 11, and the blower fan 1b of the combustion blower 1 and the atomizer 9 are rotated at high speed.
The fuel is atomized, collides with the inner circumferential surface of the gas specific volume 3 and is vaporized, mixed with the air sent by the blower 1 and sent to the burner 4 where it is burned.

In this case, the air sent by the blower 1 is divided into the center and the outer periphery of the vaporizer 3 by an air guide plate 8 attached to the blower 1, and the air in the outer periphery has an airtight function and is vaporized. This is intended to suppress the leakage of the air-fuel mixture that is being stirred in the container 3, but the volume from the air guide plate 8 to the burner 4 becomes the volume of the vaporizer 3, and mixing occurs outside the vaporizer 3. The vaporized fuel condenses on the air guide plate 8, flows to the backing 13, penetrates, and flows out of the machine, or the air-fuel mixture leaks from the backing 13, and furthermore, tar or liquid is deposited near the air outlet in the blower. There were drawbacks such as fuel accumulation.

This invention provides a vapor leakage prevention plate that is in close contact with the air inlet of the vaporizer and has an air inlet.
It is an object of the present invention to provide a liquid fuel combustion device that eliminates the above-mentioned conventional drawbacks and reduces the backflow of the air-fuel mixture in the carburetor and the leakage of vapor and fuel.

Embodiments of the present invention will be described below with reference to the drawings.

Incidentally, in each embodiment, the same or equivalent parts as those of the conventional one shown in FIG.

FIG. 2 shows a first embodiment, in which a vapor leakage prevention plate 14 having an air introduction port 15 in the center is disposed between the air inlet end of the vaporization chamber 3 and the air guide plate 8, and this vapor leakage prevention plate 14 is provided. The plate 14 is brought into close contact with the air inlet end of the vaporizer 3 by a spring 16 interposed between the plate 14 and the air guide plate 8 , and is spaced apart from the air guide plate 8 .
A space is also formed between the outer periphery of the blower 1 and the inner periphery of the casing of the blower 1 .

The liquid fuel combustion apparatus of the first embodiment configured as described above has an air supply side of the vaporizer 3 heated by the heater 11.
The vapor leak prevention plate 14 having the air inlet 15 is constantly pressed by the spring 16 to keep it in close contact with each other to prevent vapor leakage and combustion leak, and the vapor leak prevention plate 14 is heated to a high temperature by heat transfer from the vaporizer 3. Prevents vapor condensation and tar formation.

Furthermore, the diameter of the air inlet 15 of the vapor leak prevention plate 14 is reduced to increase the flow velocity of the air supplied to the vaporizer 3, thereby minimizing leakage due to disturbance of the air-fuel mixture in the vaporizer 3.

In FIG. 3, the spring 16 is placed closer to the center of the carburetor 3, but substantially the same effect as that in FIG. 2 can be obtained.

FIG. 4 shows a vapor leak prevention plate 14 attached to an air guide plate 8 fixed to a combustion blower 1 via a spring 16 with a stepped screw 1.
7 for easy assembly.

In FIG. 5, a pin 18 for positioning the spring 16 is provided on the air guide plate 8 to facilitate assembly.

FIG. 6 shows a second embodiment, in which at the air inlet of the carburetor 3,
Vapor leak prevention plate 14 having an air inlet 15 in the center
However, the prevention plate 14 and the air guide plate 8 are brought into close contact by a spring 16 interposed between them, and a cylinder 19 fixed to the air guide plate 8 protrudes toward the carburetor 3 side so as to wrap around the air inlet of the carburetor 3. , is loosely inserted into the groove 20 of the vaporizer 3 via the outer peripheral side of the vapor leakage prevention plate 14.

In the liquid fuel combustion apparatus of the second embodiment configured as described above, the vapor leak prevention plate 14 is connected to the vaporizer 3 by the spring 16.
Since the air inlet part of the vapor leak prevention plate 14 is always pressurized and in close contact, it prevents vapor leakage and fuel leakage.
This prevents vapor condensation and tar formation due to the high temperature of the vapor, and also increases the flow velocity of the air supplied to the vaporizer 3 through the air inlet 15 of the vapor leak prevention plate 14, thereby disturbing the air-fuel mixture in the vaporizer 3. This is the same as in the first embodiment, in that the leakage due to the leakage is extremely reduced.

Furthermore, a cylinder 19 fixed to the air guide plate 8 is loosely inserted into the groove 20 of the vaporizer 3 to prevent a slight leakage of vapor, and is wrapped.
This increases the pressure on the upstream side of the air and reduces the area through which air passes through the lapped portion to provide an air tight effect and reliably prevent vapor leakage to the outside of the machine.

In FIG. 7, the tip of the cylinder 19 is fitted to the outer periphery of the air inlet of the carburetor 3, but since the carburetor 3 is not provided with the groove 20, the structure is simple.

FIG. 8 shows a third embodiment, in which a hole 21 is provided on the outer circumferential side of the portion of the vapor leak prevention plate 14 that is in close contact with the air inlet of the vaporizer 3.
The configuration is the same as that shown in FIG. 7 except that .

The third embodiment configured as described above rectifies the vortex or turbulent air supplied from the combustion blower 1 through the numerous holes 21 on the outer periphery of the vapor leak prevention plate 14. The air is introduced into the vaporizer 3 through the air inlet 15 in the center of the air filter 14.

Therefore, the air has a substantially uniform flow velocity, and backflow of the air-fuel mixture is prevented.

Also, almost similar to the second embodiment, the outer surface of the air intake part of the vaporizer 3 is made airtight to prevent vapor leakage.
This provides double leakage prevention.

FIG. 9 shows a case in which a wire mesh 22 is provided between the outer periphery of the vapor leakage prevention plate 14 and the cylinder 19. The wire mesh 22 has an excellent rectifying function similar to the hole 21 of the third embodiment, so the third embodiment
Effects similar to those of the example can be expected.

Figure 10 shows a cylinder 19 provided in the air guide plate 8 with many holes 2.
3, and since the cylinder 19 has a rectifying function, substantially the same effect as that of the third embodiment can be expected.

In the case shown in FIG. 10, the vapor leakage prevention plate 14 is formed integrally with the vaporizer mounting plate 6.

FIG. 11 shows a fourth embodiment, in which a vapor leak prevention plate 14 formed integrally with the vaporizer mounting plate 6 and the air intake part of the vaporizer 3 are placed between them with a backing 24 made of a heat-resistant elastic material. The backing 24 is covered with a backing cover 25 made of non-ferrous metal such as aluminum foil and having a U-shaped cross section.

The liquid fuel combustion device configured as described above uses the elasticity of the backing 24 and the plastic deformation of the backing cover 25 to seal between the vaporizer 3 and the vapor leakage prevention plate 14. Therefore, dimensional accuracy and joint surface accuracy of the contact portions of the vaporizer 3 and the vapor leakage prevention plate 14 are required.

Since the backing cover 25 is provided on the side of the vaporizer 3, there is an advantage that the backing 24 is not exposed.

The backing 24 can reliably prevent leakage of vapor and fuel.

In FIG. 12, an L-shaped backing cover 25 made of non-ferrous metal such as aluminum foil is used to wrap around the backing 24, and this cover 25 is curled around the air inlet 15 and the periphery of the vapor leak prevention plate 14. Almost the same effects as those of the fourth embodiment can be expected.

As explained above, the present invention provides a carburetor supported by a combustion blower casing or a combustion tube and having a burner attached to one end thereof, and a blower fan side of the blower from the air inlet end of the vaporizer on the side opposite to the burner. A liquid fuel combustion device comprising: an air guide plate disposed in a casing of a blower and fixed within a casing of a blower, the air sent by the blower fan being divided into a central part and an outer peripheral part of the vaporizer by the air guide plate; A vapor leak prevention plate with an air inlet in the center is placed in close contact with the air intake end of the vaporizer and separated from the air guide plate between the vaporizer and the air guide plate, so that the vaporization part and the blower part are connected. It is double partitioned by a vapor leak prevention plate and an air guide plate, and the air guide plate does not lose the same function as the conventional one described above, so the conventional vaporizing part and blowing part can be combined into one.
Compared to a type that is only heavily partitioned, it is significantly more effective in preventing the air-fuel mixture in the carburetor from flowing back toward the blower and leaking fuel and fuel vapor to the outside. This provides the effect of preventing tar and liquid fuel from accumulating near the air outlet of the guide section or the like.

[Brief explanation of the drawing]

Figure 1 is a side sectional view showing a conventional liquid fuel combustion device;
3 is a sectional side view showing a first embodiment of the present invention, FIG. 3 is a sectional view of a spring mounting portion showing a modification thereof, FIG. 4 is a sectional view of a spring mounting portion showing another modification, and FIG. FIG. 5 is a sectional view of a spring mounting part showing still another modification, FIG. 6 is a side sectional view showing a part of the second embodiment of the invention, and FIG. 7 is a sectional view of the main part of the modification. , FIG. 8 is a side sectional view of a part of the third embodiment, FIG. 9 is a sectional view of the main part showing one modification thereof, FIG. 10 is a sectional view of the main part showing another modification ψ1j, and FIG. FIG. 11 is a cross-sectional view of the main part showing the fourth embodiment, and FIG. 12 is a cross-sectional view of the main part showing a modification thereof. 1... Combustion blower, 2... Combustion tube,
3... Carburizer, 4... Burner, 6...
...-Carburetor mounting plate, 8...Air guide plate, 1
4...Vapor leak prevention plate, 15...Air inlet, 16...Spring, 19...
・・・Cylinder, 21, 23... Hole, 22...
・Wire mesh, 24...Backing. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A vaporizer 3 supported by the casing or combustion tube 2 of the combustion blower 1 and having a burner 4 attached to one end, and the air blower from the air inlet end of the vaporizer 3 on the side opposite to the burner 4. 1
and an air guide plate 8 disposed on the side of the blower fan 1b and fixed inside the casing of the blower 1.
In a liquid fuel combustion device in which the air sent by the vaporizer 3 is divided into the center and the outer circumference of the vaporizer 3 by the air guide plate 8, a vapor leak prevention plate 14 having an air inlet 15 in the center is attached to the vaporizer 3. A liquid fuel combustion device characterized in that it is provided between the carburetor 3 and the air guide plate 8, in close contact with the air inlet end of the carburetor 3 and at a distance from the air guide plate 8. 2. The liquid fuel combustion device according to claim 1, wherein a spring 16 is interposed between the vapor leakage prevention plate 14 and the air guide plate 8 fixed to the combustion blower 1. 3. Make the cylinder 19 protrude from the vaporizer 3 side of the air guide plate 8,
3. The liquid fuel combustion apparatus according to claim 2, wherein the cylinder 19 surrounds the vapor leakage prevention plate 14. 4 The cylinder 19 is protruded from the vaporizer 3 side of the air guide plate 8 in close proximity to the vapor leak prevention plate 14, and the vapor leak prevention plate 1
4. The liquid fuel combustion apparatus according to claim 1, characterized in that a rectifying means such as a hole 21 and a wire mesh 22 is provided in or between the cylinder 19 or between the cylinder 19. 5. The vapor leak prevention plate 14 is also used as a vaporizer mounting plate,
2. The liquid fuel combustion device according to claim 1, wherein the vapor leak prevention plate 14 is brought into close contact with the vaporizer 3 via a backing 24.