Kabushiki Kaisha Toshiba

Toshiba Medical Systems Corporation

Tomohiko Jimbo

Tomonao Takamatsu

Hideo Iwasaki

Hitoshi Hattori

Harunobu Fukushima

Rika Hosaka

Biswas Debasish

Hideo Kitamura

Satoshi Ota

Amane Majima

Katsumi Gotanda

Yasutaka Shindo

Tomokazu Harada

Tetsuya Sadotomo

Makoto Nakano

Takeshi Shinkai

In a gas circuit breaker, arc-extinguishing gas is filled in a container. A movable portion housed in the container includes a movable arc contact. The movable portion includes a pressure accumulator that increases pressure of an arc-extinguishing gas. An opposing portion housed in the container includes an opposing arc contact, an exhaust pipe, and a shielding portion. The shielding portion includes a first shielding wall intersecting with an axial direction of the pipe and a second shielding wall having a cylindrical shape extending from the first shielding wall toward the movable portion along the axial direction of the pipe. The second shielding wall includes through-holes. Lengths of the respective through-holes along the axial direction are from 18 millimeter's to 55 millimeters inclusive. An arc-extinguishing gas whose pressure has been increased in the pressure accumulator flows into a space to extinguish arc discharge, and flows into the second shielding wall.

Gas circuit breaker

In a gas circuit breaker according to an embodiment, a container is filled with an arc extinguishing gas. A movable part housed in the container and includes a movable arc contact. The movable part is provided with an accumulation part for increasing pressure of the arc extinguishing gas. A counter part is housed in the container and includes a counter arc contact, an exhaust pipe, and a shield. The shield is disposed in the exhaust pipe in a state that a flow of the arc extinguishing gas inside the exhaust pipe is allowed. A nozzle is housed in the container and provided with a space. An arc discharge occurs between the movable arc contact and the counter arc contact in the space. The arc extinguishing gas having an increased pressure in the accumulation part flows into the space to extinguish the arc discharge and flows into the exhaust pipe. The shield has a first shield wall crossing the axial direction of the exhaust pipe.

According to an aspect of the present invention, there is provided an X-ray CT scanner including: a gantry; a revolving body provided inside the gantry; an X-ray tube assembly provided in the revolving body; a heat radiator provided inside the revolving body so as to be connected to the X-ray tube assembly; a heat storage material provided in the heat radiator and capable of accumulating a heat generated by the X-ray tube assembly; and an X-ray detector provided inside the revolving body so as to oppose the X-ray tube assembly.

X-ray CT scanner

A rotor is rotatably supported in a gantry housing having a substantially sealed structure. An X-ray tube is provided in the rotor. A cooler is provided in the rotor and cools a refrigerant within the X-ray tube. An X-ray detector is provided in the rotor. A reconstruction unit reconstructs an image on the basis of an output of the X-ray detector. A radiator is fixed inside the gantry housing at a position opposite to an exhaust opening of the cooler when the rotor is stationary.

X-ray computed tomographic apparatus

According to the invention, an X-ray CT apparatus includes: an annular rotator including: an X-ray tube; an X-ray detector disposed oppositely to the X-ray tube; a radiator disposed in the vicinity of the X-ray tube and dissipating heat from the X-ray tube; an air outlet provided in the vicinity of the radiator; and an air inlet provided at a position oppositely to the air outlet, a gantry cover covering peripheral of the annular rotator and having an upper air vent and a plurality of lower air vents; a plurality of fans discharging to the outside air exist in a gap between the gantry cover and the annular rotator from the air outlet; and a baffle plate provided in the gap in the vicinity of the lower air vents and controlling an air flow passing through internal space of the annular rotator and an airflow passing through the gap.

X-ray CT apparatus

Growing community of inventors

Fujisawa, Japan

Tomohiko Jimbo