JPH0672686B2 - Liquid fuel combustion device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to heating as a device for vaporizing and burning liquid fuel,
It is used in fields such as hot water supply, heating, and drying.

2. Description of the Related Art Conventionally, this type of vaporizer has a structure as shown in FIG. That is, the lower portion of the wicking body 2 provided around the outer periphery of the heating element 1 is placed in the flow of the fuel circulation path 3. The fuel in the fuel tank 4 passes through the discharge pipe 6 by the pump 5 under the suction member 2 in the circulation path 3 and flows down to the fuel tank 4 in the return pipe 7. The heating element 1 is a coil-shaped resistor that is heated by energization. The wicking body 2 is made of heat resistant fibers such as alumina and silica, and sucks the above-mentioned fuel from the bottom of the circulation path 3 to the heating element 1 by capillary action. That is, the heating element 1 and the wicking element 2 constitute a vaporization element for vaporizing a liquid. Combustion air is sent to the vaporization section by the blower 8 upstream of the vaporization section. Further, a part of the combustion air does not pass through the vaporization section, but passes through the pneumatic pipe 9 on the outer periphery of the circulation path 3, and is passed through the gap 11 between the burner 10 and the connection section of the circulation path 3 to the burner 10.
Flowing in the direction. Therefore, the vaporized gas generated in the vaporization section is mixed with combustion air and supplied to the burner 10 for combustion.

Problems to be Solved by the Invention When such a vaporizer is used in a combustion apparatus such as a boiler having a large amount of combustion, it is necessary to arrange a plurality of vaporizer elements in parallel. At this time, there is no problem if the fuel is uniformly supplied to each vaporizing element, but if the fuel is not supplied even to one of the vaporizing elements,
The vaporizing element is burned. Moreover, such a phenomenon is very likely to occur when the combustion device is installed at an inclination when the combustion device is installed. Then, when the vaporization element is burnt, the temperature of the vaporization element rises to a high temperature, and finally, there is a problem that the heating element 1 is broken or the vaporization portion is ignited.

Therefore, the present invention provides a liquid fuel combustion apparatus which has a simple structure and supplies fuel uniformly to each vaporization element even if the combustion apparatus is installed at an inclination.

Means for Solving the Problems The technical means of the present invention for solving the above problems is to provide a liquid circulation path in the vaporization section with an inclination such that the upstream side is upward, and to direct from the upstream side to the downstream side. A plurality of vaporizing elements are arranged side by side in the lateral direction, and the fuel is made to flow from both outer sides of the vaporizing element group toward the inner side of the vaporizing element group.

Action The action of this technical means is as follows.

The fuel in the fuel tank passes through the circulation path by the pump and passes through the lower portion of the wick. The wicking body sucks up the fuel by capillary action and supplies it to the heating element. Then, the fuel is heated and vaporized by the heating element and supplied to the burner. Here, when the fuel is supplied to the circulation path through the discharge pipe, the fuel flows from both outer sides of the vaporization element group toward the inner part, so that the two flows collide with each other almost at the center line part of the circulation path, and a uniform flow occurs. It becomes a flow and supplies fuel to each vaporization element. As a result, even if the combustion device is installed in a tilted state, the vaporization element does not become burnt as in the past because there is a flow that overcomes the inclination, preventing the heating element from breaking and ignition in the vaporization part. You can do it.

Embodiment One embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, a vaporization element 14 composed of a heating element 12 and a suction body 13 which surrounds the outer periphery of the heating element 12 has a fuel circulation path 15
Are placed in the flow of. That is, as shown in FIGS. 2 and 3, a plurality of vaporization elements 14 are arranged side by side in the lateral direction from the upstream side to the downstream side of the inclined fuel circulation path, and can cope with a large combustion amount. Is done. The fuel in the fuel tank 16 is supplied to the circulation path 15 by the pump 17 through the discharge pipe 18 and the fuel injection port 19 on the slope upstream side. Then, the fuel passes under the suction body 13 of the circulation path 15 and flows down to the fuel tank 16 through the return pipe 20. The heating element 12 is a coil-shaped resistor that is heated by energization, and the heating element 13
Is made of heat-resistant fibers such as alumina and silica, and sucks fuel from the bottom of the circulation path 15 to the heating element 12 by capillary action. The vaporization element 14 is composed of the heating element 12 and the suction body 13, and a plurality of vaporization elements 14 are arranged in parallel to constitute a vaporization section 21 for vaporizing fuel.

Combustion air is sent to the vaporization unit 21 by a blower 22 located upstream of the vaporization unit 21. A part of the combustion air does not pass through the vaporization section 21, but passes through the pneumatic pipe 23 on the outer periphery of the circulation path 15, and the burner.
It flows in the direction of the burner 24 through the gap 25 at the connecting portion between 23 and the circulation path 15. Therefore, the vaporized gas generated in the vaporization section 21 is mixed with combustion air and supplied to the burner 24 for combustion.

Specific operation relationships of the embodiment of the present invention having such a configuration will be described below. The fuel in the fuel tank 16 is pump 17
Is sent to the circulation path 15, flows through the bottom of the circulation path 15 having a downward slope in the downstream direction, and returns to the original fuel tank 16 through the return pipe 20. Here, when the heating element 12 starts to be energized, it sucks up fuel by capillary action.
Fuel is vaporized by heating from the upper part of 13. This amount of vaporization has a constant relationship with the amount of electric power supplied. In this case, the fuel flow rate is always larger than the vaporization amount. This is because of the following reason: When the fuel flow rate is higher than the vaporization amount, the electric energy supplied to the heating element 12 is used for vaporizing all the fuel, so the temperature of the heating element 12 becomes lower than the boiling point of the fuel. It can be suppressed. On the other hand, when the amount of vaporization is larger than the fuel flow rate, the amount of electric power supplied to the heating element 12 is supplied more than is used for vaporizing the fuel, so the heating element 12 overheats and the temperature rises, Because it will be in a baked state.

On the other hand, the above-mentioned burning state not only occurs when the fuel flow rate is smaller than the vaporization amount, but when a plurality of vaporization elements 14 are arranged in parallel, the fuel flows non-uniformly in the circulation path 15, resulting in a plurality of vaporization elements. It is a phenomenon that occurs even when any one of 14 is supplied with the fuel of less than the set vaporization amount. Also, the combustion device is not always installed horizontally,
Even if the combustion device is installed at an inclination, it is essential to uniformly supply the fuel to each vaporization element 14.

Therefore, in this embodiment, as shown in FIGS. 2 and 3, the fuel supplied from the fuel tank 16 by the pump 17 passes through the discharge pipe 18 and is upstream of the vaporization element group 14 on both outsides of the vaporization element group 14. It is supplied from the fuel injection port 19 in the inside toward the inward part of the circulation path 15. Since the fuel jets 19 are opposed to each other, the two flows flowing from the fuel jets 19 collide with each other almost on the center line of the circulation path 15. As a result, the energies of the flows cancel each other out, creating a nearly uniform flow in the circulation path 15 and the suction body 13
Is supplied to the bottom of the. For this reason, the heating element is generated by capillary action.
The fuel sucked up to 12 becomes substantially uniform between the vaporization elements 14, and the vaporization element 14 is always supplied with the fuel of a set vaporization amount or more to the heating element 12. Therefore, the heating element 12 does not overheat, and the baked state does not occur.

Further, when the combustion device is installed, even if the combustion device is installed at an inclination, the flow of the fuel ejected from the fuel injection port 19 collides almost on the center line of the circulation path 15 and becomes a uniform flow and vaporizes. Since there is a flow that overcomes the slope to be supplied to the element group 14, a sufficient fuel flow rate can be supplied to each vaporization element 14.

Furthermore, if a partition plate 26 is provided in the circulation path 15 on the upstream side of the fuel injection port 19, the flow toward the upstream side of the circulation path 15 generated when the fuel flows collide with each other will circulate after the collision with the partition plate 26. Since it flows toward the downstream of the passage 15, it is further effective to make the fuel flow in the circulation passage 15 uniform.

EFFECTS OF THE INVENTION The present invention, on the upstream side of the inclination of the vaporization element group, allows the fuel to flow from both outsides of the vaporization element group to the inner portion, thereby uniformly supplying the fuel to each vaporization element, and burning the vaporization element group. It is possible to prevent the breakage of the heating element and the ignition in the vaporization part.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a liquid fuel combustion apparatus according to an embodiment of the present invention, FIG. 2 is a left side view of FIG. 1 in which the vaporization section is vertically cut, and FIG. A top view and FIG. 4 are partially cutaway front views of a conventional liquid fuel combustion apparatus. 12 ... Heating element, 13 ... Suction element, 14 ... Vaporizing element, 15 ...
Circulation path, 19 ... Fuel injection port, 21 ... Vaporization section.

Claims (1)

[Claims] 1. A vaporization section, a burner connected to the vaporization section, and a blowing means for feeding vaporized gas carrying air to the vaporization section,
A discharge pipe having a pump provided between the vaporization section and the liquid tank and a return pipe, and the circulation path generated in the vaporization section by the pump is provided with an inclination such that the upstream section is upward with respect to the downstream section. , A plurality of vaporizing elements composed of a heater that generates heat by energization and a suction body that sucks up the liquid fuel are provided side by side from the upstream side to the downstream side of the slope, and the vaporizing element group is provided upstream of the vaporizing element group in the circulation path. And a liquid fuel combustion apparatus configured to flow the liquid fuel from both outer sides of the vaporization element group toward the inner side.