中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

27 records (took 0.011 seconds)

    Liquid-metal plasma valve configurations
    22.
    发明授权
    Liquid-metal plasma valve configurations 失效
    液金属等离子阀配置

    公开(公告)号：US4093888A

    公开(公告)日：1978-06-06

    申请号：US692173

    申请日：1976-06-02

    Applicant: Gisela Eckhardt ,  Wilfried O. Eckhardt

    Inventor： Gisela Eckhardt ,  Wilfried O. Eckhardt

    IPC: H01J13/04 ,  H01J13/00

    CPC classification number: H01J13/04

    Abstract: Liquid-metal plasma valve has an anode, a condenser and a force-fed liquid-metal cathode. These bound the interelectrode space through which the plasma jet acts during conduction. The cathode directs the plasma jet to impinge on an inclined surface which acts as the anode. The inclined surface reflects the particles to the condenser when the anode is noncondensing, but when the functions of anode and condenser are combined, the inclined surface of the condensing anode traps the jet particles. When the anode is noncondensing, in some cases the condenser and anode are at the same potential and in other cases the condenser and cathode are at the same potential. Cathode, anode and condenser are shaped to minimize the transit time of jet particles from emission to condensation.

    Abstract translation: 液金属等离子体阀具有阳极，冷凝器和强力供给的液态金属阴极。 这些限制了等离子体射流在传导期间作用的电极间空间。 阴极引导等离子体射流撞击作为阳极的倾斜表面。 当阳极不凝结时，倾斜表面将颗粒反射到冷凝器，但是当阳极和冷凝器的功能组合时，冷凝阳极的倾斜表面捕获喷射颗粒。 当阳极非冷凝时，在某些情况下，冷凝器和阳极处于相同的电位，而在其他情况下，冷凝器和阴极处于相同的电位。 阴极，阳极和冷凝器成形为使射流颗粒从发射到冷凝的传播时间最小化。

    Liquid-metal arc switching device and process
    23.
    发明授权
    Liquid-metal arc switching device and process 失效

    公开(公告)号：US3659132A

    公开(公告)日：1972-04-25

    申请号：US3659132D

    申请日：1970-07-02

    Applicant: HUGHES AIRCRAFT CO

    Inventor： ECKHARDT WILFRIED O

    IPC: H01J13/04 ,  H01J13/32 ,  H01J13/00

    CPC classification number: H01J13/32 ,  H01J13/04 ,  H01J2893/0089

    Abstract: The electrical switch device has an envelope in which is mounted a force-fed liquid-metal cathode, an anode, a condenser which may or may not be subdivided for voltage grading purposes and, in the preferred embodiment, electrical shielding means for the condenser. The cathode is capable of very high electron-to-atom emission ratio. The required value for the electron-to-atom emission ratio is above 50 to 1. When arcing occurs from the liquid metal, a plasma jet of electrons, ions, and neutral particles is emitted from the arc spot. In addition, during arcing as well as non-arcing periods, some of the liquid metal evaporates from the cathode. This evaporation occurs into a much larger solid angle than that subtended by the plasma jet. The anode is mounted facing the cathode and it intercepts the plasma jet, thus permitting current conduction between anode and cathode with minimum voltage drop. The anode is kept at an elevated temperature, so that none of the ions and neutrals of the impinging plasma jet can remain condensed on it. They are immediately re-evaporated, including the ions after they have been neutralized. The condenser has a very much larger area than the exposed liquid metal area on the cathode, at least 100 times the exposed liquid metal area to dominate the equilibrium and it is kept at a low enough temperature to efficiently condense the liquid-metal vapor emitted by the cathode. With mercury used as the liquid metal, the condenser temperature is kept substantially below 0*, preferably at about -35* C, which is just above the melting point of mercury. The combination of the high electronto-atom emission ratio of the cathode with the large, low temperature condenser results in an equilibrium background pressure (i.e., pressure outside the plasma jet) of at least as low as 10 3 Torr during arcing and lower than 10 4 Torr during non-arcing periods. This low background pressure, in turn, permits the essentially unperturbed propagation of the plasma jet between the cathode and the anode surface upon which it impinges. Such a discharge mode is commonly referred to as a ''''vacuum arc''''. The fact that the plasma jet is emitted only during arcing and that the pressure within the space surrounding this jet is kept low, results in the ability to hold off electric fields up to 50 kV per centimeter between anode and cathode immediately after cessation of arcing. Arcing may cease because of a zero in the current fed to the switching device, as in conventional arc devices, or it may cease due to depletion of the liquid metal available for arcing on the surface of the force-fed cathode. In the latter case, the current fed to the switching device is forcibly interrupted. The process employs these characteristics for switching.

Patent Agency Ranking