JP3803959B2 - Liquid fuel ignition mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid fuel ignition mechanism for igniting a liquid fuel such as kerosene (hereinafter referred to as a liquid fuel) using electric energy emitted from a piezoelectric element as ignition energy.
[0002]
[Prior art]
There is a battery ignition mechanism as a typical conventional liquid fuel ignition mechanism in combustion equipment such as an oil stove, an oil stove, and an oil bath using liquid fuel. The battery ignition mechanism supplies the electrical energy released from the primary battery 22 to the filament 23 made of platinum wire or the like by turning on the switch 24 as shown in FIG. The liquid fuel impregnated in the lamp core 21 in the combustion equipment is heated by the thermal energy released from the filament 23, vaporized and evaporated, and ignited.
[0003]
[Problems to be solved by the invention]
The following problems are associated with the battery ignition mechanism in the conventional combustion device. That is, since the filament 23 is a thin wire, deformation and disconnection of the filament 23 occur not a little, and due to this, the occurrence of unstable ignition including ignition delay, the occurrence of inability to ignite, the replacement of the filament accompanying them, and the tip of the lamp core 21 This is a problem that the ignition does not easily occur due to carbonization, that is, in addition to the ignition delay, the replacement of the primary battery 22 which is a consumable item is required and the ignition delay is accompanied by the deterioration of the battery performance.
The present invention provides a liquid fuel ignition mechanism that solves the problems of the battery ignition mechanism, that is, a liquid that can provide quick and stable ignition without using any consumables that require replacement. It is to provide a fuel ignition mechanism.
[0004]
[Means for Solving the Problems]
The means will be described below with reference to FIG.
The liquid fuel ignition mechanism according to the present invention has a configuration in which the plunger 2 connected to the plunger rod 13 is disposed in the syringe 1, and an opening 14 is provided on the side surface of the syringe 1, and the flame outlet tube 4 projects from the opening 14. An opening 17 is provided on the side surface or bottom surface of the syringe 1 and a narrow space 20 having an exhaust gas discharge hole 19 is provided outside the opening 17, and an exhaust gas discharge valve 18 is disposed in the narrow space 20. The structure and the structure in which the spark discharge electrode 16 is disposed in the syringe 1 and the spark discharge electrode 16 is connected to the piezoelectric element 12 through the conductive wire 11, and the oil supply pipe 7 is protruded from the syringe 1 through the on-off valve 9. The configuration is configured such that the piezoelectric element 12 is pressurized by suspension of the protruding portion 5 provided on the plunger rod 13 on the piezoelectric element pressing piece 15.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
An opening 14 is provided in the side surface of the syringe 1 constituting one of the liquid fuel ignition mechanisms according to the present invention, and the flame lead-out tube 4 projects from the opening 14 toward the light core 3 in the combustion equipment. Here, the flame outlet tube 4 has two functions. That is, the first function is a function for introducing air from the tip of the flame outlet tube 4 into the syringe 1 through the opening 14 so as to form a combustible air-fuel mixture in the syringe 1. In FIG. 1, when the plunger 2 moves to the right of the opening 14 due to the outward pulling of the plunger rod 13, the inside of the syringe 1 communicates with the outside air, so that air is introduced into the syringe 1. It becomes possible.
The second function is a function for deriving a flame generated by ignition / combustion of the combustible air-fuel mixture formed in the syringe 1 toward the light core 3 in the combustion device through the opening 14. Due to the ignition / combustion of the combustible mixture in the syringe 1 and the volume expansion of the combustible mixture in response thereto, the pressure in the syringe 1 rises, and therefore the flame passes through the flame outlet pipe 4. The liquid fuel led out to the lamp core 3 and impregnated in the lamp core 3 is ignited and burned.
[0006]
In addition to the flame outlet pipe 4, an oil supply pipe 7 is protruded from the syringe 1 through an on-off valve 9. One end of the fuel supply pipe 7 is connected to the liquid fuel storage section 8, and liquid fuel is supplied into the syringe 1 through the on-off valve 9. Here, the on-off valve 9 provided between the syringe 1 and the oil supply pipe 7 is opened by an initial stage in which the inside of the syringe 1 is depressurized by pulling the plunger 2 disposed in the syringe 1 outward. When refueling is performed in the syringe 1 and the pressure is further reduced thereafter, the on-off valve 9 controls the stress from the pressing member 10 to come into close contact with the syringe 1 and the refueling into the syringe 1 is stopped. The opening / closing valve 9 is in close contact with the oil supply pipe 7 under the pressure of the pressing member 10 such as a spring except when the inside of the syringe 1 is under reduced pressure.
Here, a plurality of grooves are provided on the outer periphery of the on-off valve 9 along the thickness direction of the on-off valve 9 to facilitate the passage of liquid fuel when the on-off valve is opened.
[0007]
A spark discharge electrode 16 is disposed in the syringe 1. The spark discharge electrode 16 is for igniting a combustible gas mixture formed in the syringe 1 by an electric spark emitted from the spark discharge electrode 16, and the spark discharge electrode 16 is connected to the piezoelectric element via the conductive wire 11. 12 is connected. Here, the piezoelectric element 12 is an energy conversion element that generates high-voltage electric energy by external pressure, and the generation of the electric energy is provided on the plunger rod 13 by pulling the plunger rod 13 outward. The piezoelectric element 12 is pressurized by releasing the stored energy of the drive spring by compressing and releasing the drive spring (not shown) built in the piezoelectric element 12 by suspending the protruding portion 5 on the piezoelectric element pressing piece 15. Thus, the electric energy is generated. However, the electric energy generated from the piezoelectric element 12 is fed to the spark discharge electrode 16 and discharged to cause an electric spark to ignite the combustible air-fuel mixture formed in the syringe 1.
[0008]
The spark discharge electrode 16 disposed in the syringe 1 is disposed in the vicinity of the bottom of the syringe or in a small space protruding from the side surface of the syringe. The reason for this is that if it is disposed in a portion other than this, it is necessary to increase the syringe internal volume required for vaporizing and evaporating the liquid fuel by reducing the pressure.
[0009]
A plunger 2 that can move in the syringe 1 in both the front and rear directions is disposed in the syringe 1. Here, the plunger 2 moves in conjunction with the movement of the plunger rod 13 connected to the plunger 2, and the plunger 2 is also moved outward when the plunger rod 13 is pulled out. The inside of the syringe 1 is depressurized due to the volume expansion in the sealed space inside the syringe 1. However, the degree of decompression increases in proportion to the outward movement distance of the plunger 2 when the on-off valve 9 is closed, and the liquid fuel is vaporized when the pressure is reduced until the vapor pressure of the liquid fuel at the temperature is reached. Start evaporation.
The vaporization and evaporation of the liquid fuel continues until a saturated state is reached as long as the decompressed state corresponding to the vapor pressure of the liquid fuel at that temperature continues.
[0010]
The plunger rod 13 is pulled out, and the liquid fuel is vaporized and evaporated by the decompression in the syringe 1 until the plunger 2 moves to the portion where the opening 14 provided on the side surface of the syringe 1 moves. When air is introduced into the syringe 1 from the opening 14 through the flame outlet tube 4 by further pulling out the plunger rod 13 after reaching the state or a state close thereto, this has already occurred in the syringe 1. A combustible mixture is formed by mixing the vapor of the liquid fuel and the introduced air.
Here, the size of the flame outlet tube 4 and the opening 14 is such that a combustible air-fuel mixture is formed in the syringe 1 within the time until the plunger rod 13 is suspended from the piezoelectric element pressing piece 15 by the plunger rod 13 being pulled out. And a size sufficient to allow the flame generated by the ignition and combustion of the combustible mixture to smoothly pass through the opening 14 and the flame outlet tube 4, that is, at least 3 mm.
Since the combustible air-fuel mixture must be formed within a short time in the process of pulling out the plunger rod 13, if the syringe internal volume is large, the sizes of the opening 14 and the flame outlet tube 4 are accordingly increased. This is due to the fact that it is necessary to have a corresponding size, and that the flame generated in the syringe 1 is reduced in resistance and quickly led out to the light core in the combustion equipment.
[0011]
An opening 17 is provided on the side surface or bottom surface of the syringe 1, and a narrow space 20 having an exhaust gas discharge hole 19 is provided outside the opening 17. Here, an exhaust gas discharge valve 18 that can move only in one direction is disposed in the narrow space 20, and the exhaust gas discharge valve 18 is in the syringe 1 during the outward movement of the plunger 2. The pressure in the syringe 1 is sucked to the side of the opening 17 and the opening 17 is closed to bring the pressure in the syringe 1 to a reduced pressure. On the contrary, in the process of moving the plunger 2 inward, the exhaust gas discharge valve 18 is pushed up to the upper portion of the narrow space 20 by the pressure increase in the syringe 1, and the opening 17 is opened, and the syringe is received. The exhaust gas generated by the combustion of the combustible air-fuel mixture generated in 1 passes through the opening 17 and is discharged to the outside through the exhaust gas discharge hole 19.
A part of the exhaust gas is exhausted to the outside even if the plunger 2 is outside the opening 14 and moves from the outside to the inside through the opening 14 and the flame outlet pipe 4. .
[0012]
[Action]
The liquid fuel ignition mechanism according to the present invention adopts the phenomenon of so-called reduced-pressure boiling, and enables the liquid fuel to be ignited by evaporating and evaporating the liquid fuel at room temperature without any heating.
Here, the vacuum boiling refers to a phenomenon in which the vapor pressure of the liquid fuel is lowered and the boiling point of the liquid fuel is lowered accordingly.
By the way, the reason why the liquid fuel ignition mechanism according to the present invention adopts the phenomenon of boiling under reduced pressure to complete the present invention is as follows.
In general, liquid fuel cannot be ignited even if it is at room temperature unless flammable vapor corresponding to that temperature is constantly generated and mixed with air, but a combustible mixture within the flammable range is formed.
Unlike kerosene, which is a typical liquid fuel, unlike alcohol, gasoline, etc., the amount of flammable vapor generated at room temperature is extremely small, so it cannot reach the concentration in the flammable range. Therefore, ignition under normal temperature and normal pressure is not possible. Is extremely difficult. For this reason, a method of heating to 320 to 430 ° C., which is the ignition temperature of kerosene, is usually employed in order to increase the concentration to the above flammable range. Here, the ignition temperature means a temperature at which ignition does not occur unless the liquid fuel is heated above a certain temperature in order to burn it.
[0013]
Heating of the liquid fuel to increase the concentration to the combustible range can be performed relatively easily when a commercial 100V power source is incorporated in the combustion equipment.
However, in a portable combustion device that does not incorporate the power source, the liquid fuel cannot be heated unless a heating source such as a battery is used.
Therefore, in the present invention, the inside of the sealed container called the syringe 1 is depressurized by pulling out the plunger 2 in order to ignite the liquid fuel at room temperature or at a low temperature of 0 ° C. or lower without using any heating source, By boiling the existing liquid fuel under reduced pressure, the vapor pressure is reduced to such an extent that the vapor concentration of the liquid fuel reaches the combustible range.
The vapor of the liquid fuel generated by the boiling of the liquid fuel under reduced pressure is generated under a reduced pressure of 1 mmHg or less. Therefore, the oxygen concentration in the mixture of the liquid fuel vapor and air is low and combustible. Therefore, it does not lead to ignition even if ignition energy by spark discharge is applied.
In the present invention, the lack of oxygen in the air-fuel mixture is compensated for by introducing air from the opening 14 provided in the side surface of the syringe 1 and the flame outlet pipe 4 protruding therefrom, thereby making the air-fuel mixture combustible and combustible. It falls within the sex range.
[0014]
The flame caused by the combustion of the combustible mixture generated in the syringe 1 due to the pressure increase of the syringe 1 by the ignition / combustion of the combustible mixture formed in the syringe 1 passes through the opening 17 and the exhaust gas discharge hole 19. It may be derived outside. However, if the size of the opening 17 and the exhaust gas discharge hole 19 is made considerably smaller than the size of the opening 14 and the distance between the inner wall of the narrow space 20 and the exhaust gas discharge valve is made narrow, the above-mentioned. The flame does not lead out from the exhaust gas discharge hole 19 to the outside. This is because the derivation has a remarkably great resistance. Therefore, the flame by combustion of the combustible air-fuel mixture generated in the syringe 1 is led out through the opening 14 and the flame outlet pipe 4.
[0015]
【Example】
The vapor pressure of kerosene, which is a typical liquid fuel, at an outside air temperature of 0 ° C. is 0.4 mmHg. Therefore, in the present invention, a syringe with a capacity of at least 100 cc is used to reduce the pressure inside the syringe 1 to the vapor pressure of 0.4 mmHg, the plunger 2 is drawn out at a speed of 10 mm / sec or more, and flammable within a minimum leak range. An air-fuel mixture is formed. Here, the internal volume of the syringe 1 may be 100 cc or less as long as a sufficient reduced pressure is obtained to reach the vapor pressure of the liquid fuel at that temperature.
In order to ignite the combustible air-fuel mixture, a piezoelectric element 12 having an output voltage of 8 kv or more and an electric energy discharge capability of 0.5 mJ or more is used.
[0016]
In the liquid fuel ignition mechanism according to the present invention, a small space protruding from the side surface of the syringe 1 is provided on the side surface of the syringe 1 in order to minimize the internal volume of the syringe 1, and the spark discharge electrode 16 is disposed in the small space. . This is because by arranging the spark discharge electrode 16 in such a small space, the plunger 2 can be pushed to the bottom of the syringe, and a reduced pressure sufficient to vaporize and evaporate the liquid fuel with a smaller syringe volume can be obtained. .
[0017]
【The invention's effect】
The first effect of the present invention is that the liquid fuel impregnated in the wick 3 in the combustion equipment is ignited by a flame, so that the entire wick is rapidly fired and there is almost no generation of oily odor or smoke. In response to this effect, the combustion device can bring the entire lamp core into a combustion state in a short time within 30 seconds, which is ½ or less than before.
[0018]
The second effect of the present invention is that both the problems of the conventional battery ignition mechanism and the ignition mechanism by the commercial 100V power supply can be solved simultaneously.
In other words, the primary battery which is a consumable product is solved by eliminating the instability and inability to ignite, including the ignition delay due to the deformation and disconnection of the filament 21 which the battery ignition mechanism has, and the replacement of the filament 21 associated therewith. The exchange of 22 is completely unnecessary.
In addition, it is possible to solve the problems of the installation place restriction and the ignition delay due to the absence of the power source which the ignition mechanism with the commercial 100V power source has.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a liquid fuel ignition device according to the present invention.
FIG. 2 is a configuration diagram of a battery ignition mechanism constituting one of conventional liquid fuel ignition devices.
[Explanation of symbols]
1. Syringe Plunger 3. Light core 4. 4. Flame outlet pipe 6. protruding portion Refueling pipe 8. Liquid fuel reservoir 9. On-off valve 10. Press member 11. Conductive wire 12. Piezoelectric element 13. Plunger rod 14. Opening 15. Piezoelectric element pressing piece 16. Spark discharge electrode 17. Opening 18. Exhaust gas discharge valve 19. Exhaust gas discharge hole 20. Narrow space 21. Light core 22. Primary battery 23. Filament 24. switch

Claims (3)

A configuration in which the plunger 2 connected to the plunger rod 13 is disposed in the syringe 1, a configuration in which an opening 14 is provided in the side surface of the syringe 1, and the flame outlet tube 4 projects from the opening 14, and a side surface or bottom surface of the syringe 1. A configuration in which a narrow space 20 having an exhaust gas exhaust hole 19 is provided outside the aperture 17 and an exhaust gas exhaust valve 18 is disposed in the narrow space 20 and a spark discharge electrode in the syringe 1 is provided. 16 is provided, the spark discharge electrode 16 is connected to the piezoelectric element 12 via the conductive wire 11, the oil supply pipe 7 is protruded from the syringe 1 via the on-off valve 9, and the plunger rod 13 is provided. A liquid fuel ignition mechanism configured to pressurize the piezoelectric element 12 by suspending the protruding portion 5 on the piezoelectric element pressing piece 15. The liquid fuel ignition mechanism according to claim 1, wherein the syringe 1 has an internal volume of at least 100 cc. The liquid fuel ignition mechanism according to claim 1, wherein a narrow space protruding from the side surface or bottom surface of the syringe 1 is provided on the side surface or bottom surface of the syringe 1, and a spark discharge electrode 16 is disposed in the narrow space.

Images