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503results about "Electric spark igniters" patented technology

Electrode for an Ignition Device

An electrode for an ignition device is made from a dilute nickel alloy which has improved resistance to high temperature oxidation, sulfidation, corrosive wear, deformation and fracture and includes at least 90% by weight of nickel; zirconium; boron and at least one element from the group consisting of aluminum, magnesium, silicon, chromium, titanium and manganese. The weight ratio of Zr/B may range from about 0.5 to 150, and may include amounts of, by weight of the alloy, 0.05-0.5% zirconium and 0.001-0.01% boron. The oxidation resistance of the alloy may also be improved by the addition of hafnium to the alloy in an amount that is comparable to the amount of zirconium, which may include an amount of, by weight of the alloy, 0.005-0.2% hafnium. Electrodes of dilute nickel alloys which include aluminum and silicon, as well as those which include chromium, silicon, manganese and titanium, are particularly useful as spark plug electrodes. These electrode alloys of the may also include at least one of cobalt, niobium, vanadium, molybdenum, tungsten, copper, iron, carbon, calcium, phosphorus or sulfur as trace elements, generally with specified maximum amounts. The ignition device may be a spark plug which includes a ceramic insulator, a conductive shell, center electrode and ground electrode. The center electrode, ground electrode, or both, may be made from the dilute nickel alloy of the invention. These electrodes may also include a core with thermal conductivity greater than that of the dilute nickel alloy, such as copper or silver or their alloys.

Flame ion current intensity detection and pulse ignition circuit

The invention relates to a flame ion current intensity detection and pulse ignition circuit, which is applied to the field of gas products such as gas water heaters, gas wall-mounted furnaces, gas air heating furnaces, gas boilers and the like. The circuit comprises a controllable inductive energy storage voltage boosting circuit, a voltage detection circuit, a constant-voltage, constant-frequency and constant-pulse-width power supply circuit and a flame ion current intensity detection and high-voltage pulse ignition circuit. A micro control unit (MCU) controls different duty ratio output of pulse width modulation (PWM)1 through a proportion integration differentiation (PID) algorithm, so the charging voltage of a capacitor C1 is stable during flame check, and the voltage is boosted to higher ignition trigger voltage during the ignition. A constant-voltage, constant-frequency and constant-pulse-width power supply is regulated by PWM2 through T2 and C3 and is used for flame ion current detection. During the flame ion current intensity detection, flame ion current is converted into voltage through R10, R11, R12, C3, C4 and the like, and the flame ion current intensity detection is realized through analog-digital (AD) sampling of the MCU. The problems that an alternating power supply of the traditional flame ion current for detection has large fluctuation, the flame ion current intensity fluctuation is caused, and the flame combustion state change requirement cannot be shown are solved. Simultaneously, flame check and ignition circuits are combined into one, and the cost is reduced.
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