JPS6352286B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a wick type oil burning device such as a portable oil stove.

Conventional configuration and its problems To stop combustion in a conventional wick-type oil combustion device, such as a portable kerosene stove, the upper end of the wick facing the combustion chamber is lowered below the fire pan of the wick guide tube and outer wick tube. to extinguish the fire. However, with this extinguishing method, it is difficult to extinguish the fire when the temperature near the fire pan of the core guide tube and the core outer tube is high, and the time it takes to extinguish the fire is prolonged. Under normal circumstances, this will cause incomplete combustion, producing odors and carbon monoxide, and especially in the event of an emergency such as a fall or an earthquake, if the fire is not extinguished instantly, it may ignite other objects or cause a fire. It becomes a problem of lack.

Therefore, various fire extinguishing means have been devised in the past.

For example, (1) the wick is lowered and the fire pan is mechanically covered with a metal lid to shut off the air (chip structure), (2) the wick is sprayed with water, and (3) a fire extinguishing hole is installed below the fire pan. There is a configuration in which the raw gas is forced above the fire pan when the wick falls, but the configuration (1) above is the most reliable, but it requires airtightness and is extremely difficult to manufacture. It is complicated and has low cost benefits. Configuration (2) above sprays water directly onto the wick, so water is contained in the wick, making reburning impossible. Configuration (3) above is currently the most used method and is a simple configuration. However, if the temperature of the fire pan becomes high (when the wick is lowered to allow combustion, or if the wick is degraded by tar, etc.), the extinguishing time becomes longer. Therefore, we recently installed a new fire extinguishing chamber with a fire extinguishing hole in the side wall below the core outer cylinder.
A method was devised in which a fire is caused to ignite in the fire extinguishing chamber during extinguishing, causing a momentary explosion, and the pressure change caused by the explosive combustion causes the fire to be extinguished.

However, multiple fire extinguishing holes were drilled into the side wall of the fire extinguishing room. Therefore, if raw gas leaks from the fire extinguishing hole (if the pressure in the fire extinguishing chamber becomes higher than atmospheric pressure), the flame burning in the upper chimney will ignite the raw gas leaking from the fire extinguishing hole, causing abnormal combustion. This could lead to the generation of a large amount of soot, raise the temperature at the bottom of the wick, and increase the amount of combustion compared to normal.In the worst case scenario, the flames could spread to the outside of the appliance, posing the danger of causing a fire. Additionally, when the wick was lowered, the pressure inside the fire extinguishing chamber rose above atmospheric pressure momentarily, causing raw gas to be ejected from the fire extinguishing hole, creating a foul odor as soon as the fire was extinguished.

In addition, in order to ensure instantaneous extinguishing performance in the event of an emergency fire extinguishment using this method, it is advantageous to enlarge the fire extinguishing chamber and the total area of the fire extinguishing holes. This is contrary to the direction of solving the above-mentioned problems. because,
This is because, in order to prevent raw gas from leaking from the fire extinguishing hole, the fire extinguishing hole must be eliminated or made smaller, and the extinguishing time will be lengthened accordingly.

Therefore, the inventors also developed a fire extinguishing means that further increases the reliability of fire extinguishing and prevents raw gas from leaking outside the appliance.
For example, we considered what is shown in FIGS. 1 to 3.

In the figure, reference numeral 1 indicates a core outer tube, 2 a core guide tube, and 3 a tank. A lamp wick 4 is inserted into a gap formed by a core outer tube 1 and a core guide tube 2 and is held by a core metal fitting 5. The core metal fitting 5 is composed of gears so as to move up and down according to the rotation of the knob 6, and the wick 4 is made to protrude from the fire pan 7.
Lower it to below the fire extinguishing slit 9 in the fire extinguishing room 8. The vertical movement of the core metal fitting 5 is linked with the shaft 10 passing through the fire extinguishing chamber 8. A valve 11 made of rubber or metal is provided above the shaft 10, and a fire extinguishing hole 12 made above the fire extinguishing chamber 8 is opened and closed by vertical movement of the shaft 10.

When the core metal fitting 5 rises, the valve 11 hits the metal fitting 13 attached to the core metal fitting 5 and the lower part of the shaft 10, raising the shaft 10 and opening the valve 11.
When the valve is lowered, the shaft 10 is lowered by the spring 14 and the valve 11 is closed. 15 is a fire extinguishing tube forming a fire extinguishing room 8, which links the vertical movement of the lamp wick 4 and the opening and closing of the fire extinguishing hole 12.

First, the movement of the fire extinguishing chamber 8 in the above-described configuration will be explained. Fig. 2 shows the state of the fire extinguishing chamber 8, lamp wick 4, fire extinguishing hole 12, and fire extinguishing valve 11 during combustion, and Fig. 3 shows the state of the fire extinguishing chamber 8, lamp wick 4, fire extinguishing hole 12, and fire extinguishing valve 11 when the fire is extinguished.

First, during combustion in FIG. 1, the lamp wick 4 protrudes from the fire pan 7, and the gas vaporized from the lamp wick 4 by the chimney (combustion tube) placed on the fire pan 7 mixes with the air entering through the plurality of pores of the chimney and is combusted.

At that time, the fire extinguishing hole 12 on the top surface of the fire extinguishing room 8 is the fire extinguishing valve 11
is pushed upward by the core fitting 5 and is in an open state, and due to the draft (negative pressure than atmospheric pressure) generated in the chimney, the inside of the fire extinguishing chamber 8 is under negative pressure and the fire extinguishing hole 1 is closed.
2, air is guided into the fire extinguishing chamber 8.
Next, when extinguishing operation (see Figure 3) is performed, the wick 4
The fire extinguishing hole 12 is closed by the fire extinguishing valve 11 at the same time as it descends below the fire extinguishing slit 9. Furthermore, as the wick 4 is lowered, evaporative gas from the kerosene flows from the extinguishing slit 9 into the extinguishing chamber 8, mixes with the air stored during combustion, and ignites the mixed gas.
Explosive combustion occurs in the fire extinguishing chamber 8, and the inside of the fire extinguishing chamber 8 becomes extremely pressurized, and the pressure escapes from the extinguishing slit 9 to the fire tray 7, blowing out the flame remaining in the fire tray 7. In this phenomenon, the larger the fire extinguishing hole 12 and the larger the capacity of the fire extinguishing chamber 8, the faster the fire can be extinguished instantly.

However, when the wick 4 goes down, the inside of the fire extinguishing chamber 8 becomes extremely pressurized, so if the fire extinguishing hole 12 were open at that time, raw gas would be spewed out from there, and even flames would come out. In the worst case, the flame is held in the fire extinguishing hole 12, and the flame does not go out even when the wick 4 is lowered, increasing the temperature at the bottom of the wick 4 and causing abnormal combustion ( This creates a very dangerous situation as it generates a large amount of soot.

This condition is the same even when the wick 4 is burned at about the same height as the fire pan 7 and a large amount of tar adheres to the wick 4. In this condition, the draft of the chimney is difficult to reach inside the fire extinguishing chamber 8. In addition, due to low combustion, the inside of the fire extinguishing chamber 8 becomes extremely hot and pressurized, and evaporated gas blows out from the lower part of the wick 4 and ignites, leading to the same dangerous situation as described above.

However, since it is possible to move the lamp wick 4 up and down and open and close the fire extinguishing hole 12 on the top surface of the fire extinguishing chamber 8, it is possible to arbitrarily set the fire extinguishing hole 12 to close when the wick goes down. This allows the volume of the fire extinguishing chamber 8 and the size of the fire extinguishing holes 12 to be arbitrarily selected, making it possible to ensure reliable fire extinguishing characteristics.

However, in this configuration, since the extinguishing slit 9 is provided in the vicinity of the lamp wick 4, it is conceivable that fuel condensed or flowing through the surface of the lamp wick 4 may accumulate in the fire extinguishing chamber 8. In this case, this extinguishing means not only does not fulfill its original role, but also causes fuel to flow back from the extinguishing slits 9 and extinguishing holes 12 during extinguishing or emergency extinguishing.
There was a problem that there was a possibility that the water would overflow and catch fire, making it even more dangerous.

Therefore, it was considered to make a hole or the like in the lower part of the fire extinguisher cylinder 15 to let the fuel return, but this had to be made as small as possible because if the hole was made large, there was a possibility that a fire could ignite inside the tank 3 through this hole. Instead, there was a possibility that the same problem as described above would occur due to clogging with tar, dirt, etc.

Purpose of the Invention The present invention has been made in view of the above problems.
To provide a wick-type oil combustion device that prevents fuel from accumulating in a fire extinguishing chamber, extinguishes fire reliably, and is safe over the long term.

Structure of the Invention In order to achieve the above-mentioned object, the present invention provides a wick-type oil combustion device, in which a fire extinguishing chamber having a slit communicating between the inside of the wick and the outer cylinder is disposed on the outer periphery of the wick outer cylinder, and the extinguishing There is an air hole above the chamber that communicates with the atmosphere.
A shaft is provided that opens and closes the air hole according to the vertical movement of the lamp wick and is held movably up and down by penetrating the bottom of the fire extinguishing chamber, and either the shaft or the bottom through which the shaft penetrates. A cut groove is installed in the fire extinguishing chamber to return the fuel that accumulates inside the tank to the tank, creating a fuel return path that is self-cleaned by the vertical movement of the wick.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. 4. Parts that are the same as those of the conventional example will be denoted by the same reference numerals, explanations will be omitted, and only different parts will be explained.

Reference numeral 16 denotes a cut groove provided in a part of the shaft 10, which creates a slight gap between the hole passing through the shaft 10 of the fire extinguisher 15 and the shaft 10 without affecting the sliding of the shaft 10. The fuel accumulated in the tank 8 is returned to the tank 3 through this.

With such a configuration, the cut groove 16 of the shaft 10 is always self-cleaned according to the vertical movement of the lamp wick 4, so there is no fear of clogging, and fuel does not accumulate in the fire extinguishing chamber 8, which can be guaranteed for a long time. Furthermore, kerf 1
The cross-sectional area of tank 6 can also be made extremely small, and there is no risk of ignition inside tank 3.

In this embodiment, the shaft 10 is provided with a cut groove 16, but this cut groove is provided toward the hole of the fire extinguishing cylinder 15 through which the shaft 10 passes, so that the fuel accumulated in the fire extinguishing chamber 8 can be drained into the tank 3. You may also return it.

Effects of the Invention As described above, according to the present invention, it is possible to provide a self-cleaning fuel return section within the fire extinguishing chamber, and it is possible to provide an oil combustion device having a long-term safe and reliable fire extinguishing means. .

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the main part of a conventional lamp-type oil combustion device, FIGS. 2 and 3 are cross-sectional views of the main part, and FIG. It is a sectional view of the main part. 1... Core outer tube, 2... Core guide tube, 3... Tank, 4... Light wick, 8... Fire extinguishing chamber, 10... Shaft, 11... Valve, 16... Cut groove.

Claims (1)

[Claims] 1 A wick that sucks up fuel from the tank and vaporizes it,
A wick guide tube and an outer wick tube that sandwich the wick and hold it vertically movably, and an inner flame tube and an outer wick tube each having a plurality of vaporizers placed on a fire pan provided at the upper end of the wick guide tube and the wick outer tube. A fire extinguishing chamber is provided on the outer periphery of the outer core tube and has a slit communicating with the inner core tube and the outer core tube. is provided with an air hole that communicates with the atmosphere, and a shaft that opens and closes the air hole in accordance with the vertical movement of the lamp wick, and that penetrates the bottom of the fire extinguishing chamber and is held vertically movably, and the shaft Alternatively, a wick-type oil combustion device is provided, in which a cut groove is formed in either the bottom of the shaft through which the fuel accumulated in the fire extinguishing chamber is returned to the tank.