Hitachi Industrial Equipment Systems Co., Ltd.

Hitachi Appliances, Inc

Hitachi, Ltd.

The University of Tokyo

Blue Innovation Co., Ltd.

Hitachi-Johnson Controls Air Conditioning, Inc.

National Aerospace Laboratory of Japan

Johnson Controls-Hitachi Air Conditioning Technology (Hong Kong) Limited

Hitachi, Ltd., Trustee for Benefit of Air Conditiong Systems Co., Ltd.

Takeshi Tsuchiya

Kotaro Chiba

Mutsunori Matsunaga

Shigeyuki Yorikane

Yuuichi Yanagase

Satoshi Nakamura

Kazuyuki Fujimura

Isao Hayase

Masahiko Takano

Masatsugu Chikano

Kenji Morita

Shinji Suzuki

Kenji Tojo

Shigekazu Nozawa

Toshiaki Yabe

Masaru Ohtahara

Masanao Kotani

Ryoji Kawai

Satoshi Kikuchi

Haruo Koharagi

Kentaro Yamamoto

Hirokatsu Kohsokabe

Isamu Tsubono

Sachio Sekiya

Toshikazu Harashima

Kosuke Sadakata

Masayuki Kumada

Shuji Hasegawa

Yoshihiro Fukaya

Shota Tanimoto

Minako Kanada

Christopher Thomas Raabe

Tomohiro Komatsu

Makoto Aoki

Yoshinobu Yosuke

Yukio Takahashi

Yuzo Kadomukai

Takashi Matsuo

Hideharu Tanaka

Hitoshi Nishimura

Yoshitaka Takeuchi

Takao Mizuno

Kazuya Sakai

Hirotaka Kameya

Osamu Okamoto

Kohei Sakai

Shunichi Mitsuya

Nae Hisano

Kazuo Sakurai

Shuhei Nagata

Tatsuo Yamanaka

Masashi Miyake

Hideyuki Taguchi

Hiroyuki Imamura

Yuta Kajie

Toshiyuki Terai

Tsuyoshi Chiba

Yuki Taniyama

Ryuichiro Yonemoto

Eisuke Kato

Ryota Iijima

Hiromu Takeda

Yasuaki Iizuka

Makoto Shibasaki

Yuichi Yanagase

Yuugo Mukai

Sho Nikaido

Shotaro Sano

Syunsuke Yasunori

Akihiro Ishikawa

Masataka Maita

Koichi Imada

Kouichi Imada

Syuuji Hasegawa

Takayuki Kumada

Shuuji Hasegawa

A suction flow path of a screw compressor includes a male-side flow path that opens in an axial direction with respect to working chambers in a suction process on the male rotor side and extends from a starting end positioned on one side of a virtual plane to a first termination end positioned on the other side; and a female-side flow path on the female rotor side that extends from the starting end to a second termination end positioned on the other side of the virtual plane. The male-side or the female-side first flow path wall is configured such that at least a partial area in a range from the starting end to the first or the second termination end is closer to a male-side or female-side rotor lobe section from the starting end side toward the first or second termination end side.

Screw compressor with improved suction flow

A screw compressor for compressing a working medium sucked through a suction opening and discharging the compressed working medium through a delivery opening, wherein the screw compressor includes: a male rotor and a female rotor that rotate while meshing with each other; a casing that houses the male rotor and the female rotor and is provided with a bore which forms a working chamber designed, together with the male rotor and the female rotor, to compress the working medium; a drive unit that rotationally drives at least one of the male rotor and the female rotor; a working chamber closing unit that forms a suction port for sucking the working medium into the working chamber and closes the working chamber when the working chamber reaches a specified capacity; and a suction space that connects the suction opening and the suction port to allow communication therebetween.

Screw compressor having working chamber closing member to regulate suction working medium flow to a working chamber

A liquid-cooled rotary compressor includes a compressor main body having a compression chamber formed by a fixed wall and a rotating wall and compressing gas, and a liquid injection path for injecting a coolant into the compression chamber, and adjusts a discharge flow rate by changing a rotational speed of the rotating wall. The compressor includes a liquid amount adjusting unit that adjusts an amount of the coolant supplied from the liquid injection path to the compressor main body according to a change in the rotational speed of the rotating wall, and a compressed gas supply path that supplies compressed gas to a downstream side of the liquid amount adjusting unit in the liquid injection path. The compressed gas is supplied from the compressed gas supply path to the liquid injection path according to the amount of the coolant supplied to the compressor main body.

Liquid-cooled rotary compressor and coolant supply method therefor

A multi-stage screw compressor includes a plurality of stages of compressor bodies that compress a gas in sequence. Each of the stages of compressor bodies has both male and female rotors that are housed revolvably in a casing in a mutually meshing state. The male and female rotors each include a rotor lobe section having a suction-side end face and a discharge-side end face on one end and the other end thereof in the axial direction and having a twisted lobe extending from the suction-side end face to the discharge-side end face. The male and female rotors in a downstream-stage compressor body of at least one certain stage, excluding an upstream-stage compressor body as the first stage, among the plurality of stages of compressor bodies are each configured such that their lead increases from the suction side in the axial direction of the rotor lobe section toward the discharge side.

Multi-stage screw compressor

In a screw compressor, a lobe of a lobe profile of a female rotor includes: a first contour line defining a leading flank; a second contour line defining a trailing flank; and a third contour line defining a lobe tip having both endpoints at which the female has the maximum radius. In the lobe profile, when a first angle formed by two line segments linking a second rotation center as a vertex and both ends of the first contour line, a second angle formed by two line segments linking the second rotation center and both ends of the second contour line, and a third angle formed by two line segments linking the second rotation center and both ends of the third contour line, the third angle is greater on the delivery side in the axial direction, and the first angle is smaller on the delivery side in the axial direction.

Screw compressor and screw rotor

This screw compressor is provided with a screw rotor, a casing accommodating the screw rotor, and a liquid feed mechanism for feeding a liquid into an operating chamber enclosed by the casing, wherein the pitch of the screw rotor changes in the axial direction from a suction end surface toward a discharge end surface.

Screw compressor having a screw rotor whose pitch changes in an axial direction from a suction end surface toward a discharge end surface

A delivery port of a rotary-screw compressor includes a first opening having a profile configured to interrupt communication with a second working chamber of a suction process that opens only in the axial direction; a second opening connected to the first opening; and a third opening connected to the first and second openings. The profile of the first opening includes a first profile line that forms one of a pair of lateral edges of a lingulate protrusion; a second profile line that forms another one of the pair of the lateral edges of the protrusion; a third profile line that extends toward the reference point along the root circle of the female rotor; and a second connection line that connects the first and second profile lines. The second opening opens into the first opening at the second connection line. The third opening opens into the first groove.

Liquid-feeding rotary-screw compressor

A safety management system to prevent unauthorized use, accident, resale, theft, and so forth of a flying object. The safety management system includes changing, at a motor controller, a power feeding amount to each drive unit based on an instruction from a main control unit, an authentication information storage unit which records registered identification information for performing operator authentication, an authentication accepting unit which accepts an input of input identification information, an operator authentication unit which performs operator authentication of an operator of the flying object based on the input identification information and the registered identification information, and a safety managing unit connected between a power source of the flying object and the motor controller of the flying object. The safety managing unit includes a switch which controls electrical connection between the motor controller and the power source based on the result of the operator authentication.

Safety management system for aircraft

A screw compressor includes a screw rotor, a casing, and a delivery side shaft sealing unit. The delivery side shaft sealing unit includes an annular groove, a seal ring, and a shaft sealing fluid supply passage. Pressure of the fluid that is supplied to the one side, in the axial direction, of the seal ring via the shaft sealing fluid supply passage is set higher than pressure that acts on a first side surface, in an axial direction with respect to a first side wall surface of the annular groove, of the seal ring.

Screw compressor having a different pressure of the fluid applied to the seal ring on the delivery side shaft sealing unit

There is provided a flight management system for managing a flight plan of flying objects that fly among ports. The flight management system includes a plurality of port management apparatuses and a flight management apparatus that manages a flight plan of a plurality of flying objects that autonomously fly among the ports, in which each of the port management apparatuses includes determination means for determining whether or not landing or takeoff of the flying objects on or from the corresponding port is possible, and possibility information output means for transferring to the flying objects possibility information about the possibility, and the flight management apparatus includes flying object information reception means for receiving flying object information including flying object position information about a position of each of the flying objects, flight plan registration means for registering the flight plan for flying between the port as a start point and the port as a target point, flight plan change means for changing the flight plan based on the received flying object position information or changed another flight plan, and instruction information output means for outputting instruction information for instructing the flying object about the flight plan.

Flight management system

Provided is a fluid machine configured such that liquid supplied to a working chamber from the outside of the fluid machine is dispersed extensively in the working chamber. This fluid machine is constituted of a screw rotor and a casing for accommodating the screw rotor and is provided with a liquid supply section for supplying liquid into a working chamber from the outside. The liquid supply section is configured so that liquid is dispersed in the longitudinal direction of the tooth groove of the screw rotor rather than in the width direction thereof.

Fluid machine

In an oil-cooled screw compressor, a tooth crest arc of a fixed width is provided to the tooth crest of a male tooth profile, and simultaneously a tooth bottom arc is provided to the tooth bottom of a female tooth profile. Due to the actions thereof, the operation chamber immediately before disappearing exists only in a bottom half region from a line that connects the centers of the male and female tooth profiles, and the opening area relative to the volume of the operation chamber can be increased. As a result, the discharge of oil becomes smooth and energy loss is reduced.

Oil-cooled screw compressor

Provided is an air compressor which helps to attain a proper discharge air temperature and which is superior in energy saving property. There are provided an air line connecting an air compressor, an oil separator, and an after cooler; an oil circulation line connecting the air compressor, the oil separator, and an oil cooler; a bearing oil supply line connecting one end of an intermediate branching portion disposed at an intermediate point of the oil circulation line between the oil cooler and the air compressor to a bearing oil supply portion of the air compressor; an intermediate portion oil supply line connecting the other end of the intermediate branching portion to an intermediate oil supply portion of the air compressor; a branching line supplying oil to the bearing oil supply portion and the intermediate oil supply portion; a blower sending air to the oil cooler and the after cooler; a bypass line connecting one end of a bypass branching portion disposed at an intermediate point of the oil circulation line between the oil separator and the oil cooler to the downstream side of the oil cooler of the bearing oil supply line; and a control valve controlling the inflow amount of the lubricating oil to the bypass line.

Air compressor

An oil&#x2014;cooled air compressor is provided with: an oil&#x2014;cooled air compressor for compressing sucked-in air and discharging the compressed air; an oil separator for separating the compressed air and lubricating oil, which are discharged from the air compressor body; an oil cooler for cooling, by outside air, lubricating oil discharged from the oil separator; oil supply pipe passage for supplying lubricating oil, which is discharged from the oil cooler, to a bearing of the air compressor body and to an intermediate section in the process of compression by the air compressor; and an after-cooler for cooling, by outside air, air discharged from the oil separator. The oil-cooled air compressor in which the air compressor, the oil separator, the oil cooler, and the after-cooler are connected to supply high-pressure air to the outside of the compressor is provided with a vapor compression type refrigeration cycle.

Air compressor having an oil separator, an oil cooler, first and second evaporators, and wherein intake air and the oil are simultaneously cooled in the first and second evaporators

There is provided a liquid feeding type screw compressor that can reduce size and weight and improve vibration insulation and sound insulation. A liquid feeding type screw compressor includes as components: a compressor main body; a motor driving the compressor main body; and a gas-liquid separator separating a liquid from a compressed air discharged from the compressor main body. The motor is arranged above the compressor main body. The gas-liquid separator is arranged below the compressor main body. A compressor main body casing constituting an inner cylindrical space forming a compression operation chamber together with the screw rotor and constituting the contour of the compressor main body and a casing constituting the contour of another component consist of an integrally molded single member.

Liquid feeding type screw compressor

Growing community of inventors

Tokyo, Japan

Takeshi Tsuchiya