Japan Atomic Energy Research Institute

Kabushiki Kaisha Toshiba

Sumitomo Electric Industries, Limited

Seiko Seiki Kabushiki Kaisha

Nihon Shinku Gijutsu Kabushiki Kaisha

Osaka Vacuum, Ltd.

Japan Vac's Metal Co., Ltd.

Natsumra Oil Research Corporation

Japan Atomic Energy Institute

Yoshio Murakami

Tetsuya Abe

Seiji Hiroki

Kenjiro Obara

Akira Yamakawa

Masaya Miyake

Kazuyuki Nakamura

Kenji Katsuki

Goro Miyamoto

Naoji Fujimori

Akihiko Ikegaya

Toshiaki Nonaka

Hisao Takeuchi

Yoshishige Takano

Shigenori Ando

Hitoshi Kondo

Masashi Iguchi

Konosuke Inagawa

Takao Soda

Masamitsu Naganuma

Masahiko Nakahara

Tetsuo Yashiki

Hiroaki Kawamura

Kounosuke Inagawa

Kenjiroh Obara

Yasuo Shimomura

Takemasa Shibata

Mitsuyosi Saito

Junichi Nakamura

Nobuhiko Tsuchiya

Koji Yanagishita

Kazunori Kitamura

Takao Uchida

Tamio Adaka

Toshihiro Kanie

A lubrication system for a bearing of a machine. The system comprises an oil tank, and an oil supply pipe for supplying the lubricant oil from the oil tank to the bearing. The system further comprises an outlet pipe for guiding the lubricant oil from the bearing substantially vertically downward so that an outlet pipe oil level may be formed in the outlet pipe. The system further comprises an oil returning mother pipe for guiding the lubricant oil from the outlet pipe to the tank. The oil returning mother pipe includes a substantially horizontal part and a weir or a flow resistance disposed close to the tank so that substantially all portion of the substantially horizontal part may be maintained full of lubricant oil.

Lubrication system and its modification method

The improved isotope separator comprises a vacuum vessel, a plasma generator located substantially in the center of the vacuum vessel, an electrode bounded by a hyperboloid of one sheet and a pair of electrodes bounded by a hyperboloid of two sheets, said electrodes being located within the vacuum vessel in such a way as to surround the plasma generator, a power source for supplying said electrodes with a fixed voltage and a pulsating voltage, and magnetic field generating means located outside the vacuum vessel. The apparatus is implemented by a method for isotope separation that achieves high separation factor per stage (process), that enables the process throughput to be increased with ease and which yet is applicable to the isotopic separation of many elements.

Method and apparatus for separating isotopes

A thread groove type vacuum pump in which the gap between a rotor and a stator is not subjected to any influence of the rotor temperature and thus the pumping performance does not deteriorate during plasma combustion in a nuclear fusion reactor. The thread groove pumping portion is formed as a circular cone so that the expansion and contraction of the rotor occurs along the generatrix of the circular cone. The pump exhibits supreme pumping performance throughout the whole running mode of the vacuum pumping system of the nuclear fusion reactor because the gap between the rotor and the stator is kept constant despite changes of thermal expansion due to the temperature change of the rotor caused by the different gas loads.

Thread groove type vacuum pump

A ring-shaped metal gasket with the cross-section thereof being substantially rectangular shaped, with the ratio (t/w) of the thickness t of the ring portion to the width w thereof being in the range of 0.5 to 4, having a Vickers hardness in the range of 50 to 120; a vacuum flange for a metal gasket, including a sealing groove for receiving a metal gasket at the surface of the flange, the width of a cross section of the groove gradually decreasing in the direction of the depth thereof, an outer side wall section of the sealing groove being substantially perpendicular to the flange surface, and an inner side wall section of the sealing groove being inclined with respect to the flange surface, with a difference in level being provided so that the flange surface positioned to the inside of the sealing groove is lower than the flange surface positioned to the outside of the sealing groove, and a vacuum seal structure including the above gasket and flange are disclosed.

Metal gasket, vacuum flange for the metal gasket, and vacuum seal

A vacuum vessel is provided in which the majority of a vessel wall including an annular wall portion (1) and a plate-wall portion (2) is formed of ceramic material such as silicon nitride, for example. To bond the plural wall members together, bonding faces having a surface flatness of not more than 1 .mu.m are prepared thereon, and then a ceramic powder bonding substance with an average particle diameter of not more than 1 .mu.m is interposed between adjacent bonding faces and subjected to heating. Because the generation of gas, such as hydrogen, from the wall of the ceramic vessel is reduced, extremely high vacuum can be generated and maintained in the interior of the vacuum vessel. Also, because the wall of the vacuum vessel has a high permeability with respect to a magnetic field and an electric field, the vacuum vessel can be used as a vessel in a particle accelerator that allows the high precision control of charged particles therein by means of an electromagnetic field.

Method of manufacturing a ceramics-type vacuum vessel

Quadrupole electrode and process for producing the same

An armature stator comprises an iron core and a coil directly mounted on the iron core. The coil is composed of wound electric wire which has a coating comprising an inorganic material, such as ceramic. A bonding material of the inorganic material is formed over the coil and iron core for filling any gaps and adhering the coil and iron core together into a unitary structure. To improve the reliability of the coil, after the electric wire is wound to form the coil, a filling material comprised of the inorganic material is formed over the coil by vacuum impregnation, and then sintered so as to repair defects in the coating disposed on the electric wire. After the bonding material is formed over the coil, which is directly mounted on the iron core, it is cured under high temperature. The armature stator thus constructed can be used with high reliability in high temperature and high vacuum applications.

Armature stator

An insulating member has an insulating layer in the form of a thin ceramic plate made of at least one of SiC, Si.sub.3 N.sub.4, AlN and Al.sub.2 O.sub.3 ad having a thickness not less than 0.1 mm and not more than 2.0 mm, and cushioning layers provided on both sides of the insulating layer through brazing alloy for relieving thermal stress. An electric part can be made of such an insulating member. The insulating member is disposed between a conductive substrate and a conductive member and brazed thereto.

Insulating member and electric parts using the same

In a quadrupole mass spectrometer which includes four parallel rod electrodes between opposite pairs of which overlapping voltages.+-.(U+V cos .omega. t) are applied (where U: a continuous voltage and V cos .omega. t: a radio-frequency voltage) and which effects mass-analysis by an electric field formed within the four parallel rod electrodes, at least one parameter of U, V and .omega. has two different values, and the values are changed over to select the first stable region or the second stable region, the first stable region being nearest to the original point and the second stable region being next near to the original point on the a - q plane (where a:ordinate, q:abscissa) showing 'stability diagram', and the ions being able to pass through the four parallel electrodes under the conditions of the first and second stable regions, where the variable a=8eU/mr.sub.O.sup.2 .omega..sup.2, q=4eV/mr.sub.O.sup.2 .omega..sup.2, U: level of DC voltage, V: peak of the radio-frequency voltage, e: charge of ion, m:mass of ion, r.sub.O : radius of an inscribed circle of the four parallel rod electrodes and.omega.: angular frequency of the radio frequency voltage.

Quadrupole mass spectrometer having plural stable regions

A lubricating grease exhibits good lubricating performance in a hot and high-vacuum environment, and contains an alkyl substituted tetraphenylether as a base oil having incorporated therein bentonite as a thickener and at least one solid lubricant selected from the group consisting of molybdenum disulfide and tungsten disulfide.

Lubricating grease

A pair of flanges are fixed to a pipe end of a port of a plasma vacuum vessel and another pipe end to be connected thereto. These flanges each have a ring-shaped knife edge. A copper gasket is interposed between the respective knife edges of the two flanges. A predetermined number of bolts are tightened to fix the flanges to each other. As a result, the knife edges bite into the copper gasket, and a linear sealing load from the knife edges acts on the gasket, thereby sealing and isolating the space inside the port from the outside. The number n of bolts are given by

Metal seal flange assembly

A method or joining ceramics comprising the steps: of preparing a ceramics body and another body to be connected with the ceramics body; of interposing a layer of ultra-fine particles having smaller size than the surface roughnesses of the contact surfaces of the ceramics body and the other body, the layer having larger thickness than the surface roughnesses, and the ultra-fine particles being reactive with the ceramics body and the other body and forming a reaction produce which has a strong bonding power to the ceramics body and the other body; and then of pressing and heating the piled composition of the ceramics body, other body and layer.

Method for joining ceramics

A method and apparatus are disclosed for detecting the presence of very fine leaks through the walls of an enclosure which include a sniffer nozzle (1) open to the atmosphere, a vessel (5) having molecular sieves (4) therein for adsorbing substantially all gaseous products which have entered the sniffer nozzle (1) with the exception of the probe gas which has been pressurized within the enclosure being tested, a pump system (8, 9) for creating vacuum conditions within the system, a mass spectrometer (12) for detecting the presence of the probe gas, and a capillary tube (2) interconnecting the nozzle sniffer (1) and the molecular sieve assembly whereby the probe gas draw rate, and sensitivity of the apparatus of the present invention, are significantly increased.

Device and method for leak location

A process for preparing a titanium carbide film characterized by vaporizing metallic titanium from a metallic titanium vaporizing source placed in an atmosphere containing a dilute acetylene gas and depositing titanium carbide onto the surface of base set up facing said source.

Process for preparing a titanium carbide film

Growing community of inventors

Ibaraki, Japan

Yoshio Murakami