JPS6287713A - liquid fuel combustion equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a combustion device that uses liquid fuel, and is used in a burner that converts liquid into gas and burns it, and is used for heating, hot water supply, heating, drying, etc.

2. Prior Art A conventional vaporizer of this type is disclosed in Japanese Patent Application No. 59-210, for example.
As shown in No. 801, the structure was as shown in Figure 3. That is, in the vaporization case 1, the lower end of the suction body 2 was placed in an oil tank 3, and the oil level in the oil tank 3 was kept at a substantially constant oil level by the closed oil tank 4.

Moreover, the suction body 2 is provided surrounding the heating element 6. The operating principle of such a conventional example will be explained below.

The suction body 2 sucks up oil from the oil tank 3 to the vicinity of the heating element 2 by capillary action. When electricity is applied to the heating element 2, the oil is vaporized by this heat generation.

This vaporized gas is transported to the burner by air from a blower 6 provided upstream of the vaporization case 1.

Problems to be Solved by the Invention However, with such a structure, if water gets mixed in with the oil, the heating element 5 and the oil tank 3 will be electrically short-circuited, resulting in an electric shock. . That is, when a large amount of water is mixed with oil and supplied to the oil tank 3, the water accumulates below the oil tank 3 because the water has a higher specific gravity than the oil. At this time, the absorbent body 2 is made of glass fiber, asbestos, natural fibers, synthetic fibers, etc. All of these fibers are insulating materials, but become conductive when water is absorbed.

When the water is sucked up, the voltage applied to the heating element 5 is applied to the oil tank 3 and the entire combustion device.

Means for Solving the Problems The present invention has a structure in which oil is circulated from an oil tank using a pump, and the oil in this circulation section is sucked up by a suction body,
In addition, an insulating layer is provided between the circulation section and the absorbent body.

action The effect of this technical means will be described below.

In the conventional example, the water accumulated below the oil tank was easily sucked up, but in the present invention, a pump is used to suck up the water and circulate it to the lower part of the suction body. Therefore, even when oil and water are sucked up by the pump, the water is crushed by the pump's driving part (piston) and supplied to the suction body as fine water droplets. While the absorbent body is filled with oil, it exhibits water repellency, so water droplets and 1-water are not absorbed into the absorbent body. Ma/
In the unlikely event that only water droplets flow continuously on a part of the lower part of the suction body,
When the oil does not flow sufficiently, the suction body has no water to attack, so it sucks up the water, and the suction body exhibits conductivity.
Although such a case is likely to occur, even in this case, if an insulating layer is provided between the absorbent body and the circulating section, the voltage of the heating element will not leak to the entire device. Also, the water that flows onto the insulating layer must be collected somewhere (pump,
Although the oil tank is short-circuited, there are water droplets on the insulating layer, and these water droplets are transmitted and no current leaks.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 and 2. The lower part of the suction body 9, which has a dimension of i6 in the outer circumference of the heating element 8, is placed in the flow of the fuel circulation path 10.

The fuel in the fuel tank 11 is delivered to a discharge pipe 13 by a pump 12.
The fuel passes through the lower part of the suction body 9 in the circulation path 1o and is measured in the return pipe 14.

It flows down to the river 11. Heating element 8 (a coil-shaped resistor that is heated by energization). Also, the suction element 2 is made of alumina,
It is made of heat-resistant fibers such as silica, and draws up the aforementioned fuel from the bottom of the circulation path 10 to the heating element 8 by capillary action. That is, the heating element 8 and the suction body 9 constitute a vaporizing section that vaporizes the liquid.

Combustion air is sent to the vaporization section by a blower 15 upstream of the vaporization section. In addition, a part of the air from the combustion blower 16 passes through the pneumatic pipe 16 on the outer periphery of the circulation path 10 without passing through the vaporization section, and flows toward the burner 17 from the gap 18 between the connection between the burner 1 and the circulation path 10. There is. Moreover, the burner 18 is attached to the pneumatic pipe 1e via a heat insulating material 19.

Further, the vaporizing section consisting of the heating element 8 and the suction body 9 is fixed to the upper cover 20 of the circulation path 1o, and is configured to be easily attached and detached from the circulation path 10 by opening the pneumatic tube cover 21.

Further, the wicking body 9 is tightly wound around the outer periphery of the coil-shaped heating element 8, and both ends of the wicking body 90 are stacked in two sheets, and the protruding portion 2
2 is formed. This two-layered portion is made of heat-resistant metal pieces or the like, and the entire periphery of the tongue 1, square/L-shaped heating element 8 is covered with a suction body 9. This protruding part 22 becomes an oil suction part,
The cylindrical portion 23 of the wicking body 9 serves as a vaporization surface. The specific operational relationship of the present invention having such a configuration will be described in detail below.

The fuel in the fuel tank 11 is transferred to the circulation path 10 by the pump 12.
However, the fuel flows through the bottom of the circulation path 10 having a downward slope in the downstream direction 1c. It also returns through the IJter 7 pipe 14 to the 7th fuel tank 11~\. In this case, this flow rate is always less than the amount to be vaporized, and when it passes through the heating element 8 and starts flowing, the fuel is heated from the upper part of the wicking element 9, which sucks up the fuel by capillary action. Carry out vaporization. The amount of vaporization always has a constant relationship with the amount of electric power applied. This vaporized gas is combined with the air from the blower 15 and flows to the burner 17 where it is combusted.
On the other hand, the air flowing around the outer periphery of the circulation path 1Q (air flows in from the interval 18, and the air that has already merged with the air 1' again)?
Konhe is diluted. This air pressure pipe 16 (and an upper lid 20 with a removable vaporizer section) is used to prevent vaporized gas from leaking out of the apparatus.

The spacing 18 also prevents heat from the burner 17 from being transferred to the vaporization section. Furthermore, the purpose of the heat insulating material 19 is also the same.

Further, on the surface of the circulation path 1o at the lower part of the suction body 9, a hollow,
The insulating layer 10a is provided with an insulating film such as a fluorine film or paint, or an insulating plate made of glass, mica, plastic, or the like. Fuel sent by the pump 12 flows and circulates on this insulating layer 10a.

The phenomenon after water gets mixed into the fuel tank 11 in the configuration of the present invention described above will be explained.

Oil and water are mixed and pulverized by the pump 12 and flow through the discharge pipe 13 to the circulation path 1o. Oil and water droplets dispersed in droplets in the oil flow under the wicking body 9.

Since the suction body 9 is filled with oil, the water droplets are not sucked up and return to the fuel tank 11 through the return pipe 14. In this state, insulation is ensured. Furthermore, as the amount of water in the oil increases, a portion of the lower part of the absorbent body 9 constantly vaporizes, resulting in an insufficient amount of oil to suck up. That is, there are places where many water droplets come into contact and absorb moisture.

In this state, the heating element 8 and the suction element 9 are electrically connected, and the voltage applied to the heating element 8 leaks throughout the device.

However, in the present invention, the circulation path 10 in which the lower part of the absorbent body 9 is located
The bottom surface of the absorbent body 9 is an insulating layer 10&, and the lower part of the absorbent body 9 is insulated from the entire device, so that the voltage of the heating element 8 is not applied to the entire device.

Further, the suction body 9 and other parts (pump 12, fuel tank 11, discharge pipe 13, return pipe 14) are not electrically connected by water. This is because the water is dispersed into droplets by the pump 12 and no electricity flows between individual water droplets. The probability that the water droplets flowing on the insulating layer 10iL will connect with each other and become electrically conductive to the discharge pipe 13, which is not insulated, is extremely low.

That is, the present invention converts the water and oil mixed in the fuel tank 11 into a non-conductive liquid mixture in which water droplets are dispersed in the oil using the pump 12, and flows the mixture through an insulated circulation section to prevent water and oil from being sucked up. Even if the body 9 sucks up water, insulation between the heating element 8 and the entire device is ensured.

In addition, as the water content increases further and the amount of water becomes equal to the oil, the mixed liquid gradually becomes conductive (the conductivity of a mixed liquid of water and oil depends not simply on the mixing ratio but on the mixing intensity). much depends). In this device, when twice as much water as oil was mixed, the insulation of the liquid was OMΩ. In such a state, the present invention has no effect. However, by this time, the flame has misfired due to the decrease in the amount of vaporized gas.

That is, in a state where water is sucked up into a part of the wicking body 9, sufficient insulation is ensured as described above, but a part of the wicking body 9 generates water vapor instead of generating petroleum gas. Therefore, the flame will disappear.

Extinguishing the flame is detected by flame detection (flame rod, thermocouple, etc. not shown), and if the operation is stopped, no leakage from the heating element 8 will occur.

Further, the heating element 8 of the present invention is coated with a sprayed coating of magnesia, alumina, etc. to enhance the insulation effect.

These porous coatings lose their insulation when they contain moisture, but
While the heating element 8 is energized, the heat gasifies moisture in the porous material to form an insulating layer. The boiling point of the fuel used in the present invention, such as kerosene, is about 190'C. Therefore, the heating element 8 that heats the absorbent body 9 always exhibits a temperature V of 190'C or more. Therefore, the water in the sprayed layer (boiling point 1o
○'C) is in a vaporized state and has sufficient dielectric strength.

This further enhances the insulation effect.0 Effects of the Invention As described above, the present invention has a simple structure and can prevent dielectric breakdown due to water in an apparatus for vaporizing liquid fuel. For example, it can be used in combination with a water detection device, an earth leakage breaker, etc. to further enhance the safety of the device.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of the liquid fuel combustion apparatus of the present invention, FIG. 2 is a sectional view taken along line A-A' in FIG. 1, and FIG. 3 is a sectional view of a conventional example. 8... Heating element, 9... Absorption body, 10.
... Circulation path, 101 ... Insulating layer, 12.
·····pump.

Claims (2)

[Claims] (1) A vaporizing section consisting of a coil-shaped heating element and a suction body that generate heat when energized; a blowing means for sending air for conveying vaporized gas to the vaporizing section; and circulating fuel between the vaporizing section and the oil tank. What is claimed is: 1. A liquid fuel combustion device comprising a pump and a circulation path, the liquid fuel combustion device comprising an insulating layer between the circulation path and the suction body. (2) The liquid fuel combustion device according to claim 1, wherein the heating element is coated with an insulating inorganic film such as alumina or magnesia.