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97results about How to "Different length" patented technology

Plasma ejection device for igniting long air spark gap and circuit thereof

The invention discloses a long air spark gap ignition mechanism. The long air spark gap ignition mechanism is characterized in that a high-energy plasma ejection device is mounted on one electrode column of the spark gap. The plasma ejection device comprises a high-voltage electrode, an intermediate-voltage electrode and a low-voltage electrode, wherein the intermediate-voltage electrode divides a flashover gap channel into a short gap channel and a long gap channel; and the intermediate-voltage electrode and the low-voltage electrode are connected an inductor therebetween to serve as a voltage division unit and an energy storage unit of a discharge circuit. The inductor is used as the voltage division unit at the initial discharge period, and then is used as the energy storage unit to achieve follow current of long gap channel arc after the energy of a discharge capacitor is released completely. The plasma ejection device can stably eject a large amount of plasma under lower discharge voltage multiple times, and the plasma ejection speed exceeds sound velocity by multiple times. The plasma ejection device can be used repeatedly with substantially no performance change after repeated ejection, and can reliably ignite and breakdown the long air spark gap.
Owner:西安西交瑞力电气研究院有限公司

Dianhydride monomer containing photocrosslinkable phenyl vinyl ketone element and preparation method thereof

InactiveCN101891720AFlexible chain lengths varyDifferent lengthOrganic chemistryMethylvinyl ketoneKetone
The invention provides dianhydride monomer containing photocrosslinkable phenyl vinyl ketone element and a preparation method thereof, belonging to the technical field of a macromolecule material. The middle of the monomer structural formula contains the phenyl vinyl ketone element which can generate photocrosslinking reaction under UV-irradiation, two sides of the phenyl vinyl ketone element do not contain or contain 2-6 -CH2- linear-chain flexible chains, and the ends of the phenyl vinyl ketone element are 2 aromatic anhydrides. In the preparation method, phenyl vinyl ketone containing 2 Ph-OH is obtained by aldol condensation, phenyl vinyl ketone containing 2 alcoholic hydroxy and 2 flexible chains is further obtained by O-alkylation, and the obtained phenyl vinyl ketone containing hydroxyl and trimellitic anhydride acyl chloride are esterified and purified to obtain the dianhydride monomer containing the phenyl vinyl ketone which meets the polycondensation purity requirement. The raw materials used in the preparation method are large-scale industrialization products, the control of the synthetic process is simple, and the obtained dianhydride has higher purity, thereby further meeting requirements for polyimide polymerization production.
Owner:TSINGHUA UNIV
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