JPS61153403A - Wick type liquid fuel burner - Google Patents

Abstract

PURPOSE:To simplify the constitution and bring the function into good play by installing a heat absorbing element of controller for wick temperature in such a way that the element is wrapped and fixed by the edge of a burner plate placed at the upper end of a wick guide cylinder. CONSTITUTION:Working fluid 72 absorbs heat from a burner plate 33 as passing through it and flows into a radiator 73 with high velocity and condenses as liquid in a container 74 and then flows into a pipe 71. In this case, the larger the temperature difference becomes, the more the flowing volume of working fluid increases and the burner plate 33 is cooled. As the burner plate 33 surrounding the exposed part of a wick 34 is connected thermally to the wick 34 via a guide cylinder 27, temperature of the top part of the wick 34 is reduced corresponding to temperature reduction of the burner plate 33 and excess vaporization of fuel is controlled and the wick 34 keeps the volume of vaporized fuel in response to the exposure extent of the wick 34. Therefore, it is possible to set up the volume of vaporized fuel in response to the exposure extent of the wick 34 and also corresponding heating power.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an improvement in a wick-type liquid fuel combustion device that can expand the range of thermal power adjustment by controlling the temperature of the wick that sucks up liquid fuel by capillary action. .

[Technical background of the invention and its problems]

A wick-type liquid fuel combustion device, for example, a typical wick-type petroleum combustor, has an inner and outer flame tube with many ventilation holes arranged concentrically to form a combustion chamber between the two tubes. A wick is placed at the bottom of the chamber to suck up oil using capillary action.
The petroleum vapor evaporated from the wick is combusted in the combustion chamber. In this type of wick-type oil combustor, the wick is usually removed, a wick guide tube is provided surrounding it, and the amount of flame is adjusted by adjusting the amount of wick exposed from the wick guide tube. We are adopting a method of...

In such an oil combustor, for example, when the wick is ignited by an igniter, the air necessary for combustion is introduced into the combustion chamber through the numerous vents provided in the inner and outer flame tubes, promoting combustion. . The combustion heat generated by this combustion heats the wick and increases the evaporation layer of oil. For this reason, 1, combustion is gradually expanded.

Normally, in such a wick type oil combustor, a combustion area is set in the upper part of the combustion chamber, and a premixing area of air and fuel is set in the lower part of the combustion chamber, in order to improve combustion efficiency and due to design issues. It is set. For this reason, the vent holes formed at the top of the inner and outer flame tubes are formed with a larger diameter than the vent holes formed at the bottom to limit the amount of air introduced into the lower part of the combustion chamber. . Therefore, when combustion is expanded as described above, the combustion region gradually moves to the upper part of the combustion chamber. This shift of the combustion zone to the upper part of the combustion chamber reduces the amount of heat input to the wick and reduces the amount of oil evaporated. As a result, a steady combustion state is achieved in which the amount of heat emitted from the wick and the amount of heat input to the wick are balanced.

However, it has been found that such oil burners have the following defects. In other words, when the wick is lowered toward the wick guide in order to reduce the firepower, the amount of oil evaporation temporarily decreases and the firepower becomes smaller, but after a while, the combustion area moves to the lower part of the combustion chamber. The temperature of the wick is raised again to increase the amount of oil evaporation. For this reason, it is not possible to reduce the firepower unless the wick is lowered extremely. Therefore, it is difficult to smoothly adjust the firepower, and the range of firepower adjustment is also narrow. Additionally, if the wick is suddenly exposed from the wick guide tube in order to increase the firepower, the wick containing a large amount of fuel will be introduced into the high-temperature atmosphere, which can quickly cause a situation. be. Furthermore, during weak combustion, a flame is formed in the lower part of the combustion chamber to ensure a predetermined amount of fuel evaporation. Therefore, the premixing region of air and fuel decreases, and the amount of harmful gases such as cobalt and THC emitted increases.

Therefore, in order to solve this problem, the inventors have recently attempted to actively control the temperature of the exposed portion of the core through a core guide tube to limit excessive heat input to the core. We proposed a new method of liquid fuel combustion equipment that improves combustibility and expands the range of thermal power adjustment. Adopting this method + l again! The baking device is equipped with a core temperature control device in which a heat-vib type heat absorption element is placed in the core guide tube, and this core temperature control device automatically controls the temperature at the tip of the core to a temperature that corresponds to the amount of exposed core. I try to do that.

However, in order for this new type of combustion device to operate well, it is necessary to sufficiently reduce the thermal resistance between the core guide tube and the heat absorption element to improve the response of the heat absorption element.
The remaining issue was how to meet this requirement without complicating the configuration.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and an object thereof is to provide a core temperature control device with a small number of core temperature control devices without complicating the configuration.
An object of the present invention is to provide a wick-type liquid combustion device that can satisfactorily exhibit the functions of the B device.

[IR requirements for invention]

According to the present invention, a wick that sucks up liquid fuel by capillary action, a wick guide tube that supports this wick, and a wick temperature control device that controls the temperature of the wick by controlling the temperature of this wick guide tube. There is provided a wick-type liquid fuel combustion device in which the endothermic element of the wick temperature control device is wrapped around and fixed to an end of a fire pan formed at the upper end of the wick guide tube.

(Effects of the Invention) According to the present invention: 1. The heat absorbing element of the S temperature control device is wrapped and fixed by the upper end of the fire pan.

Among the parts that make up the wick guide tube, the part that receives the most heat from the flame is the fire pan. A heat-absorbing element is fixed to this fire pan, and since this heat-absorbing element is fixed in an enveloping manner, it is fixed in a state where the thermal resistance between it and the fire pan is sufficiently small. Therefore, when the combustion area moves to the lower part of the combustion chamber, that is, when the exposed layer of the wick is reduced, the amount of heat received by the fire pan increases, so the amount of heat absorbed by the heat absorption element also increases rapidly, and as a result, the tip of the wick The temperature of the core can be maintained at a temperature corresponding to the amount of exposure of the core.

In addition, when the combustion area moves to the upper part of the combustion chamber, that is, when the amount of exposed wick is increased, the amount of heat received by the fire pan decreases, so the amount of heat absorbed by the heat-absorbing element also decreases quickly, and as a result, the tip of the wick The temperature of the core can be maintained at a temperature corresponding to the amount of exposure of the core. Therefore, just by changing the amount of exposure of the wick, the range of heat power adjustment can be changed significantly. Furthermore, even if the exposed amount of the wick is suddenly increased in order to increase the firepower, the temperature at the tip of the wick will not rise rapidly because the wick is cooled by the endothermic element via the wick guide tube. . Therefore, excessive flare-ups do not occur. In addition, the tip of the wick is kept at a temperature that corresponds to the amount of exposure, and the amount of fuel evaporation is suppressed to an amount that corresponds to the above temperature, so even when set to a weak combustion state, noxious gases are released. There is no such thing as occurring.

In this way, in the present invention, in particular, since the heat-absorbing element is provided so as to wrap around the upper end of the fire pan, it is possible to fix the heat-absorbing element easily and reliably. Since the thermal resistance can be made sufficiently small, the responsiveness of the heat absorbing element can be improved. Therefore, the functions of the core temperature control device can be exhibited well, and the core temperature control device itself can be made smaller.

[Embodiments of the invention]

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

FIG. 1 shows a schematic configuration of a wick type oil combustor to which the present invention is applied, and 1 indicates a combustor housing. This combustor housing 1 has an opening 2 on its front surface, a heat reflecting plate 3 facing the opening 2, and a storage tank 4 for storing oil on the side. It becomes. A combustor main body 5, which will be described later, is installed on the front surface of the heat reflecting plate 3, and below the opening 2, there is a knob for controlling the wick of the combustor main body 5, which will be described later, up and down. 6 is placed.

Specifically, the combustor main body 5 is constructed as shown in FIGS. It is composed of a fuel supply section 10, a combustion section 11, and a core temperature control device 12.

The fuel supply unit 10, as shown in FIGS. 2 and 3,
The fuel tank 21 is provided with an annular fuel tank 21 which is arranged with its opening facing upward and is always supplied with oil up to a certain level from the storage tank 4. This fuel tank 21 has an outer wall 2
The inner wall 23 is formed to be sufficiently longer than the inner wall 2 in the axial direction. A flange portion 24 bent outward is formed at the upper end of the outer wall 22, and a flange-shaped fire pan 25 bent inward is formed at the upper end of the inner wall 23. A stepped cylindrical body 26 whose lower part is formed to have a larger diameter than the outer wall 22 of the fuel tank 21 and whose upper part is formed to have a smaller diameter than the outer wall 22 is fixed coaxially to the outer wall 22 on the upper surface of the flange part 24. The upper part of this stepped cylinder 26 and the inside! 23
A core guide tube 27 that guides a core 34, which will be described later, with the upper part of the core.
．． It consists of 28. At the upper end of the core guide tube 27,
As shown in FIG. 3, the upper end has a portion 29 that extends slightly outward horizontally at the same height as the fire pan 25, and a portion 30 that extends a predetermined height with the tip of this portion 29 directed upward.
A portion 31 is formed by extending the tip of this portion 3o horizontally outward by a predetermined length, and a portion 32 is formed by extending the tip of this portion 31 upward by a predetermined length. The portions 29, 30, 31, and 32 constitute a fire pan 33 that supports an outer flame tube 52, which will be described later. Core guide tube 27.28
A cylindrical core 34 made of, for example, glass fiber, which sucks up petroleum by capillary action, is inserted into the annular space formed between the fuel tank 21 and the lower end thereof. This core 34 is supported by a support tube 35.

This support tube 35 is provided so as to be movable only in the vertical direction and not rotatable. A plurality of pins 36 are protruded from the outer surface of the support cylinder 35, and these pins 36 are fitted into diagonal holes 38 formed in a cylinder 37 which is rotatably placed on the flange 24. ing. The outer surface of the cylindrical body 37 has a third
As shown in the figure, a rack 39 is fixed, and this rack 39 meshes with a pinion 40. The shaft 40 is connected to a shaft 41 provided through the stepped cylinder 26 via a bearing, and this shaft 41 is connected to the knob 6. Note that a plurality of ventilation holes 42 are formed in the portion 30.

The combustion section 11 is configured as follows. That is, as shown in FIG. 4, the combustion section 11 is broadly divided into an inner flame tube 51 placed on the fire pan 25 formed at the upper end of the wick guide tube 28, and a portion 31 of the flame m33. It is comprised of an outer flame tube 52 which is placed on top and forms a combustion chamber P between it and the inner flame tube 51, and an outer flame tube 53 which is disposed outside of this outer flame tube 52.

The inner flame tube 51 is arranged with its opening facing downward, and has a plurality of ventilation holes 54 on its peripheral wall and upper wall to maximize airflow.
Consists of a trumpet-shaped airflow deflection plate 56 that deflects the airflow so as to contribute to combustion, and a disc-shaped airflow restriction plate 58 that is fitted and fixed inside the bottomed cylindrical body 55 and has a large number of ventilation holes 57. has been done.

The outer flame 1152 includes a cylindrical body 60 whose upper and lower ends are open and has a plurality of ventilation holes 59 on its peripheral wall, and a flange 61 that is integrally provided at the upper end of this cylindrical body 60 and projects outward. , and a projecting peripheral wall 62 that slightly protrudes downward from the peripheral edge of the flange 61. The ventilation holes 54 and 59 provided in the inner flame [151 and the outer flame tube 52] are connected to each flame tube 51.
The hole diameter of the hole provided on the upper side of the combustion chamber 52 is larger than the hole diameter of the hole provided on the lower side, so that the amount of air flowing into the upper space in the combustion chamber P flows into the lower space. It is set to be large compared to the amount of air. On the other hand, the outer cylinder 53 includes a transparent glass cylinder 63,
It is constructed by vertically coaxially connecting a cylindrical body 64, and the upper end portion of the glass tube 63 is fixed to the protruding periphery W62 of the outer flame tube 52. And internal inflammation! i51 and the outer flame [152] are connected by a connecting rod (not shown).

On the other hand, the core temperature control device 112 is configured as follows. That is, as shown in FIG. 4, a highly thermally conductive material is tightly caulked to the portion 32 so as to be partially wrapped by the outer surface of the upper end of the fire pan 33 formed at the upper end of the wick guide tube 27. It is composed of a pipe 71, a working fluid 72 sealed inside the pipe 71, and a radiator 73 interposed in a part of the pipe 71. The radiator 73 is composed of a vertically long container 74 whose lower end is located at a height higher than the level of the pipe 71, and connection parts 75 and 76 formed at the upper and lower ends of the container 74. ing. The upper half of the outer surface of the container 74 is fixed to the wall surface of the combustor housing 1 located on the back side of the heat reflecting plate 3 via a good heat conductor 77.

Next, the operation of the wick type oil combustor constructed as above will be explained.

First, the tip of the wick 34 is raised to the position of the fire pan 25 by operating the knob 6. Note that when the knob 6 is rotated, the binion 40 is rotated and the rack 39 is moved in the circumferential direction. As a result, the cylinder 37 rotates. The support cylinder 35 connected to the diagonal hole 38 formed in the cylinder body 37 via the pin 36 is provided so as to be unable to rotate and to be movable only in the vertical direction. Therefore, when the cylinder 37 rotates, a vertical force acts on the support cylinder 35 via the pin 36. Therefore, by rotating the knob 6, the amount of exposure of the wick 34 into the combustion chamber P can be freely adjusted.

In this state, after igniting the tip of the wick 34 with an igniter (not shown), operate the knob 6 to set the wick guide 27 of the wick 34 on fire.
．． By temporarily controlling the amount of fuel evaporation by increasing or decreasing the amount of exposure from 28, and changing the temperature of the fire pan 33,
Pipe 71 and hydraulic fluid 7 present in pipe 71
A temperature difference occurs between the heat absorbing element consisting of the heat absorbing element 2 and the heat radiator 73, and the flow rate of the working fluid 72 flowing through the pipe 71 changes according to this temperature difference. That is, when the working fluid 72 passes through the position of the fire pan 33, it absorbs heat from the fire pan 33 and evaporates, increasing the speed and flowing into the radiator 73. It condenses into a liquid at the part that is thermally connected to the wall of 1. This liquid then flows into the pipe 71 again. In this case, the larger the above-mentioned temperature difference is, the more the flow rate of the working fluid flowing through the vibrator 71 increases. As a result, the fire pan 33 is attached to the combustor housing 1.
It is cooled in the direction approaching the wall surface temperature of . The fire plate 33 is the wick 3
4, and the fire pan 33 is thermally connected to the wick 34 via the guide tube 27. Therefore, when the temperature of the fire pan 33 decreases, the temperature of the tip of the wick 34 also decreases, thereby suppressing excessive fuel evaporation from the tip of the wick 34. Therefore, from now on, core 3
The amount of fuel evaporation is maintained in accordance with the amount of exposure of No. 4.

In this way, the amount of fuel evaporation can be set in accordance with the amount of exposure of the wick 34, and the thermal power can be obtained in accordance with this. Therefore, by operating the knob 6, it is possible to adjust the firepower over a wide range. Furthermore, even if the exposed amount of the wick 34 is suddenly increased in order to increase the firepower, since the wick 34 is cooled via the wick guide tube 27, the temperature of the exposed portion of the wick 34 will not rise rapidly. Nothing happens. therefore,
It is also possible to prevent the occurrence of excessive standing flames that tend to occur in such cases. Furthermore, the temperature of the wick 34 is maintained at a value corresponding to the amount of exposure, and the amount of fuel evaporation is suppressed to an amount corresponding to the above temperature, so even when set to a weak combustion state, complete combustion is achieved. It is also possible to suppress the generation of harmful gases that tend to occur in such cases. Furthermore, since the pipe 71 constituting the heat absorbing element is wrapped around and fixed at the upper end of the fire pan 33, which is most likely to receive heat supply from the flame, the response of the heat absorbing element can be improved, and the core temperature It is possible to exhibit the m control function even better, and as a result, it is possible to contribute to downsizing of the core temperature control device 12.

In addition, since the pipe 71 constituting the heat absorption element is wrapped and fixed at the upper end of the fire pan 33, it is possible to make the thermal resistance between the fire 1 [[133 and the pipe 71] uniform in the circumferential direction and sufficiently small. As a result, fuel evaporation can be made uniform in the circumferential direction, and uneven combustion can also be prevented. Therefore, the effects described above can be achieved.

Note that the present invention is not limited to the above embodiments. That is, in the embodiment described above, the upper part of the container constituting the radiator is thermally connected to the wall of the combustor casing, but instead of being connected to the wall of the combustor casing, the radiator is connected to the wall of the combustor casing. The container may be provided with fins on the upper wall surface, or the radiator may be formed integrally with the combustor housing.

In addition, working fluids include water, alcohol, ammonia,
Freon etc. can be used. In addition, various modifications can be made without departing from the gist of the present invention.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view of a wick oil combustor to which the present invention is applied, and Fig. 2 is a side view of the combustor body incorporated in the combustor with only the right half cut away. , Fig. 3 is a perspective view showing only the fuel supply section of the combustor main body taken out and partially cut away, and Fig. 4 is a perspective view showing only the combustion section of the combustor main body taken out and shown partially cut away. be. DESCRIPTION OF SYMBOLS 1... Combustor housing, 3... Heat reflector, 4... Storage tank, 5... Combustor main body, 6... Knob, 10...
- Fuel supply section, 11... Combustion section, 12... Core temperature control device, 21... Fuel tank, 27.28... Core guide tube, 25.33... Fire pan, 51... Inner flame tube, 5
2... Outer flame tube, 71... Pipe, 73... Heat radiator, 72... Working fluid. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) A wick equipped with a wick that sucks up liquid fuel by capillary action, a wick guide tube that supports this wick, and a wick temperature control device that controls the temperature of the wick by controlling the temperature of this wick guide tube. A wick-type liquid fuel combustion device, characterized in that the endothermic element of the wick temperature control device is wrapped and fixed by an end of a fire pan formed at the upper end of the wick guide cylinder. (2) The wick-type liquid fuel combustion device according to claim 1, wherein the heat absorption element is a pipe with good thermal conductivity through which a working liquid flows.