TWI444573B - Electronic ignition device - Google Patents

Description

Electronic ignition device

The invention relates to an electronic ignition device.

Ignition devices currently on the market can be divided into calcium carbide ignition devices and electronic ignition devices in principle.

The calcium carbide ignition device includes a roller, a calcium carbide in contact with the roller, and a fuel corresponding to the calcium carbide. When the calcium carbide ignition device is in operation, the user dials the roller to rub the calcium carbide to generate a spark, and the fuel is ignited by the high energy of the spark. The fuel is a low ignition point fuel such as an oil absorbing cotton core. The calcium carbide is a lossy product, the replacement is troublesome and the local temperature of the generated spark is low, and the ignition performance is poor, so the calcium carbide ignition device has been gradually replaced by the electronic ignition device.

The electronic ignition device includes a power source, a discharge electrode electrically connected to the power source, and a target corresponding to the discharge electrode. The power source is a pulse power source or a piezoelectric conversion device composed of a dry battery and a discharge capacitor, and has an operating voltage, and the discharge electrode has a discharge end having a smaller diameter. When the electronic ignition device is in operation, a voltage difference is generated between the discharge electrode and the target through the power supply, so that the discharge end of the discharge electrode collects a large amount of electric charge and forms a high voltage, and the voltage difference is equivalent to the operating voltage. When the high voltage reaches the breakdown voltage of the gaseous medium, the high voltage breaks through the gaseous medium and a spark discharge occurs to generate a number of sparks. When the gaseous medium includes a fuel, the spark ignites the fuel, which includes oil, gas, natural gas, or biogas.

As can be seen from the above description, whether the electronic ignition device can ignite the fuel depends on whether the high voltage formed at the discharge end reaches the breakdown voltage of the gas medium. When the high voltage reaches or exceeds the breakdown voltage, the electronic ignition device is capable of generating a spark to ignite the fuel. The main factor in obtaining the high voltage of the electronic ignition device depends on the operating voltage of the power source and the diameter of the discharge end. In the case where the diameter of the discharge end is fixed, the higher the operating voltage of the power source is, the higher the high voltage is obtained; in the case where the working voltage of the power source is fixed, the smaller the diameter of the discharge end, the higher the high voltage obtained, that is, The greater the probability of sparking through the gaseous medium. For safety and cost reasons, it is generally desirable that the operating voltage of the power source be as low as possible, that is, the smaller the diameter of the discharge end is, the better, thereby reducing the cost of the electronic ignition device and improving the safety of the electronic ignition device.

At present, most electronic ignition devices use an elongated metal wire as a discharge electrode. Since the discharge end of the discharge electrode is generally made of a metal material, it has been difficult in the prior art to process the discharge end made of the metal material to a micron or nanometer level. Therefore, the electronic ignition device needs to select a power source with a higher operating voltage to generate a spark to ignite the fuel.

In view of this, it is necessary to provide an electronic ignition device having a lower operating voltage.

An electronic ignition device for igniting a fuel, the electronic ignition device comprising a power source, a discharge electrode electrically connected to the power source, and a target opposite to the discharge electrode, the discharge electrode and the target having a gap, the fuel is transferred to the gap during operation, and the improvement is that the discharge electrode comprises a nano carbon line structure, the nano carbon line structure extending from the end of the target to a plurality of tips, and the phase There is a certain gap between the two adjacent tips.

Compared with the prior art, in the electronic ignition device provided by the present invention, the discharge electrode comprises a nano carbon line structure, wherein the diameter of the carbon nanotube serving as the discharge end of the discharge electrode in the nano carbon line structure is nanometer. level. Therefore, the electronic ignition device can generate a spark at a lower operating voltage, so that a power source with a lower operating voltage can be selected, which reduces the cost and safety of the electronic ignition device.

100‧‧‧Electronic ignition device

10‧‧‧Power supply

11‧‧‧negative

12‧‧‧ positive

20‧‧‧displacement electrode

30‧‧‧ Target

40‧‧‧Ignition switch

200‧‧‧ gas pipeline

FIG. 1 is a schematic structural view of an electronic ignition device according to an embodiment of the present invention.

2 is a scanning electron micrograph of a carbon nanotube-like structure as a discharge electrode in the electronic ignition device according to the embodiment of the present invention, which is close to one end of the target.

Figure 3 is a transmission electron micrograph of the tip of the nanocarbon line-like structure of Figure 2.

Hereinafter, an electronic ignition device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, an electronic ignition device 100 according to an embodiment of the present invention is used to ignite a fuel (not shown). The combustible gas may be one or any combination of oil and gas, gas, natural gas or biogas. The combustible gas is transmitted to the electronic ignition device 100 through a gas pipe 200 at the time of ignition, and forms a gaseous medium with the air in the electronic ignition device 100.

The electronic ignition device 100 includes a power source 10, a discharge electrode 20, a target 30, and an ignition switch 40. The discharge electrode 20 is disposed opposite to the target electrode 30, and the discharge electrode 20 and the target electrode 30 are electrically connected to the power source 10, respectively.

The power source 10 is used to form a voltage difference between the discharge electrode 20 and the target electrode 30. In the present embodiment, the power source 10 is a piezoelectric ceramic having a negative electrode 11 and a positive electrode 12, and the negative electrode 11 and the positive electrode 12 are electrically connected to the target electrode 30 and the discharge electrode 20, respectively. When the piezoelectric ceramic is pressed by mechanical force, a voltage pulse is generated between the negative electrode 11 and the positive electrode 12, so that the discharge electrode 20 generates a high voltage, and the gas between the discharge electrode 20 and the target electrode 30 is broken. The medium generates a spark to ignite the fuel, and the fuel is doped in the gaseous medium. It will be appreciated that the power source 10 can also be other power source capable of generating the voltage pulse, such as a voltage pulse igniter.

The discharge electrode 20 is electrically connected to the negative electrode 11 of the power source 10 through a wire, and the wire is covered with an insulating casing. The discharge electrode 20 is disposed opposite to the target electrode 30 and has a gap. In theory, the shorter the distance of the gap, the lower the breakdown voltage required to generate a spark, but the distance of the gap is too short, the discharge electrode 20 is Or the target 30 is more likely to be damaged by the burning of the fuel. Therefore, in general, the gap is generally between 1 mm and 2 μm. The discharge electrode 20 comprises a nano carbon line-like structure comprising at least one carbon nanotube as a discharge end of the discharge electrode 20, the diameter of the carbon nanotube being 0.4 nm to 50 nm. .

The nanocarbon line-like structure comprises at least one nano carbon line, one twisted line structure formed by twisting a plurality of nano carbon lines, or a bundle structure formed by side by side of a plurality of nano carbon lines. The nano carbon pipeline includes a plurality of carbon nanotubes that are twisted or substantially parallel along the axial direction thereof. The plurality of carbon nanotubes are connected end to end and are arranged substantially along the axial direction of the carbon nanotubes, and the adjacent carbon nanotubes pass through the van der Waals. Valli connection. The nano carbon line is not limited in length and has a diameter of 0.5 nm to 100 μm. Specifically, the nano carbon pipeline can be obtained by mechanically twisting or organic solvent treatment of pulling a carbon nanotube film from an array of carbon nanotubes, and the nano carbon pipeline can also be obtained from one nanometer. The carbon tube array is directly pulled out and obtained. The plurality of carbon nanotubes in the twisted nanocarbon pipeline obtained by mechanical force twisting are arranged in an axial spiral around the nanocarbon pipeline. The non-twisted carbon nanotube obtained by directly pulling out a carbon nanotube array or treating the carbon nanotube film with an organic solvent The plurality of carbon nanotubes in the line are arranged substantially in parallel. The nanocarbon pipeline obtained by the organic solvent treatment and the preparation method thereof are disclosed in the US Patent No. US2007/0166223 A1, which was filed on October 26, 2007, to Shou-Shan Fan et al. patent application. In order to save space, only the above is cited, but all technical disclosures of this application should also be considered as part of the technical disclosure of the present application.

The nanocarbon line-like structure has one or more carbon nanotubes near the end of the target 30, and each of the plurality of carbon nanotubes serves as a discharge end of the discharge electrode 20. The diameter of the single carbon nanotubes is below 50 nm, so the nanocarbon line-like structure can obtain the high pressure of the gas medium between the discharge electrode 20 and the target 30 at a lower operating voltage. That is, to obtain a high voltage of the same size, the power source 10 having a lower operating voltage can be selected. It can be understood that the nanocarbon line-like structure can obtain a higher high voltage when the operating voltage of the power source 10 is fixed, and therefore, the probability of generating a spark is greater. When the discharge electrode 20 and the target electrode 30 have an increase in the gap therebetween due to loss or other reasons, the electronic ignition device 100 can still generate a spark, which increases the reliability of the electronic ignition device 100.

Referring to FIG. 2 and FIG. 3, in the embodiment of the present invention, one end of the nanocarbon line-like structure adjacent to the target end 30 further includes at least one conical tip extending therefrom. The tip is a carbon nanotube bundle structure, and the carbon nanotube bundle structure includes a plurality of carbon nanotubes extending axially along the tip end. The plurality of carbon nanotubes in the tip are combined by a van der Waals force, and the tip is away from one end of the discharge electrode and includes a protruding carbon nanotube, and the protruding carbon nanotube is the discharge electrode 20 discharge end. In the embodiment of the present invention, when the discharge ends are plural, there is a certain gap between the discharge ends, and the electric field mask between the discharge ends can be avoided, and the protruding carbon nanotubes are passed by other surrounding carbon nanotubes. Van der Valli is firmly fixed, so the protruding carbon nanotubes can be Withstand a large discharge voltage. The tip can be formed by a fusing method, a laser ablation method or an electron beam scanning method to treat the nanocarbon line structure.

The surface of the nanocarbon line-like structure may further be formed with a metal carbide layer resistant to ion impact or provided with a plurality of metal carbide particles. Preferably, the metal carbide layer or metal carbide particles are disposed on the nano carbon. The outer surface of each carbon nanotube in the pipeline structure. The metal carbide layer or the metal carbide particles can make the ions generated by the ionized gas medium not directly impact the carbon nanotubes during the discharge process, thereby making the nano carbon line-like structure more resistant to ion impact and prolonging the nano carbon pipeline. The service life of the structure. The metal carbide may be any one or a combination of niobium carbide, zirconium carbide, titanium carbide, and niobium carbide. Preferably, the metal carbide is selected from tantalum carbide. Specifically, the metal carbide layer can be formed on the surface of the nanocarbon line-like structure by ion sputtering. The method for forming the metal particle carbide particles may include the steps of: forming a metal coating layer on the outer surface of at least one of the carbon nanotubes in the nanocarbon line structure; and feeding the nano carbon line structure in a vacuum The medium is energized to melt the metal coating on the outer surface of the carbon nanotube and react with the carbon atoms in the carbon nanotube to form a plurality of metal carbide particles on the outer surface of the carbon nanotube.

The target 30 is a metal electrode that is electrically connected to the positive electrode 12 of the power source 10. It can be understood that the target 30 can also be a hollow metal tube connected to the gas pipe 200, and the fuel is ejected from the middle of the hollow metal pipe. At this time, the target 30 is grounded.

The ignition switch 40 is used to control the power source 10 to form a voltage difference between the discharge electrode 20 and the target electrode 30. In the present embodiment, the ignition switch 40 is a pressing device that presses the piezoelectric ceramic to be deformed by mechanical force. The piezoelectric ceramic is deformed to generate a voltage difference between the discharge electrode 20 and the target electrode 30. The discharge end of the discharge electrode 20 collects a large amount of surface charges and forms a high voltage, and the high voltage breaks between the discharge electrode 20 and the target electrode 30. A gaseous medium that produces a spark to ignite the fuel.

The discharge electrode comprises a nano carbon line-like structure, and the diameter of the carbon nanotube serving as the discharge end of the discharge electrode in the nanocarbon line-like structure is nanometer. Therefore, the electronic ignition device can generate a spark at a lower operating voltage, so that a power supply with a lower operating voltage can be selected, which reduces cost and improves safety.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by those skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

100‧‧‧Electronic ignition device

10‧‧‧Power supply

11‧‧‧negative

12‧‧‧ positive

20‧‧‧displacement electrode

30‧‧‧ Target

40‧‧‧Ignition switch

200‧‧‧ gas pipeline

Claims (16)

An electronic ignition device for igniting a fuel, the electronic ignition device comprising a power source, a discharge electrode electrically connected to the power source, and a target opposite to the discharge electrode, the discharge electrode and the target having a gap, the fuel is transferred to the gap during operation, and the improvement is that the discharge electrode comprises a nano carbon line structure, the nano carbon line structure extending from the end of the target to a plurality of tips, and the phase There is a certain gap between the two adjacent tips. The electronic ignition device of claim 1, wherein the tip is conical, and the tip is a carbon nanotube bundle structure, the carbon nanotube bundle structure comprising a plurality of axial orientations along the tip end Extended carbon nanotubes. The electronic ignition device of claim 1, wherein one end of each tip near the target includes a protruding carbon nanotube as a discharge end. The electronic ignition device of claim 3, wherein the protruding carbon nanotubes are fixed by van der Waals force by other surrounding carbon nanotubes. The electronic ignition device of claim 3, wherein the protruding carbon nanotube is located at a center of the tip end. The electronic ignition device of claim 3, wherein the protruding carbon nanotubes have a diameter of 0.4 nm to 50 nm. The electronic ignition device of claim 1, wherein the nanocarbon line-like structure comprises at least one nanocarbon line. The electronic ignition device of claim 7, wherein the nanocarbon line-like structure comprises a twisted wire structure in which a plurality of nanocarbon lines are twisted to each other. The electronic ignition device of claim 7, wherein the nanocarbon line-like structure comprises a plurality of nano carbon lines arranged side by side to form a bundle structure. The electronic ignition device of claim 7, wherein the nanocarbon pipeline comprises a plurality of carbon nanotubes connected end to end and arranged substantially along the axial direction of the nanocarbon pipeline, and the adjacent carbon nanotubes pass through the van der Waals Force connection. The electronic ignition device of claim 10, wherein the plurality of carbon nanotubes in the nanocarbon line are helically arranged axially along the nanocarbon line. The electronic ignition device of claim 10, wherein the plurality of carbon nanotubes in the nanocarbon line are arranged substantially in parallel. The electronic ignition device of claim 7, wherein the nanocarbon line has a diameter of 0.5 nm to 100 μm. The electronic ignition device of claim 1, wherein the power source is a piezoelectric ceramic. The electronic ignition device of claim 1, wherein the target is a hollow metal tube through which the fuel is transported to the gap. The electronic ignition device of claim 1, wherein the distance between the discharge electrode and the target is 1 mm to 2 μm.