Hitachi, Ltd.

Hitachi Industrial Equipment Systems Co., Ltd.

Hitachi-Johnson Controls Air Conditioning, Inc.

Masanao Kotani

Sachio Sekiya

Takeshi Tsuchiya

Ryoji Kawai

Kotaro Chiba

Minako Kanada

Masahiko Takano

Kentaro Yamamoto

Toshikazu Harashima

Kosuke Sadakata

Mari Uchida

Shigeyuki Sasaki

Daigoro Kamoto

Tomohiro Komatsu

Kokugan Yoko

The present invention effectively cools air in a compression process at a high stage when an oil is supplied at the same pressure at a low stage and the high stage. Provided is a liquid-cooled type compressor including: a liquid-cooled type compressor body; at least one first nozzle; and at least one second nozzle, the at least one first nozzle and the at least one second nozzle each having a plurality of injection ports per nozzle and supplying a refrigerant through the injection ports into an inside of the compressor body, the second nozzle having the injection ports each having a diameter larger than a diameter of each of the injection ports of the first nozzle.

Liquid-cooled type compressor having first and second nozzle injection ports with different characteristics

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

The present invention provides an oil feed type air compressor that can reduce a power consumption of a compressor body during an unload operation. The oil feed type air compressor includes: a compressor body () compressing air while feeding an oil into a compression chamber; a separator () disposed on a discharge side of the compressor body; a compressed air-feeding system () feeding the compressed air separated by the separator to a use destination of the compressed air; an oil-feeding system () feeding the oil separated by the separator to the compression chamber of the compressor body; an oil cooler () and a temperature sensor () disposed in the oil-feeding system; and a controller enabling execution of a temperature control. The temperature control by the controller is performed by variably controlling a rotation speed of a cooling fan () such that, during the load operation, a temperature detected by the temperature sensor is a target value T, and during the unload operation, the temperature detected by the temperature sensor is a target value T(with the proviso of T&#x3e;T).

Oil feed type air 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

In a refrigeration cycle device, a compressor, a heat exchanger serving as a condenser, an expansion valve, and a heat exchanger serving as an evaporator are connected in order through refrigerant piping to form a refrigeration cycle. The refrigeration cycle device includes an evaporation temperature sensor provided between the expansion valve and the exchanger serving as the evaporator. The opening degree of the expansion valve is controlled such that an evaporation temperature detected by the evaporation temperature sensor reaches a control target value of the evaporation value. As a result, the refrigeration cycle device capable of achieving enhanced controllability while preventing liquid back to the compressor is provided.

Refrigeration cycle device

An air conditioning apparatus suppresses an increase in power consumption associated with a reduction in start-stop frequency of a compressor. The air conditioning apparatus includes an outdoor unit equipped with a compressor and a plurality of indoor units connected with the outdoor unit and has a control device that performs thermo-off and thermo-on control such that a suction air temperature of the indoor unit falls within a predetermined temperature range with a set temperature defined as a reference. The control device detects the suction air temperatures of the indoor units, and, in a case where a sum total of air conditioning capacities of the indoor units, the suction air temperatures of which are between the set temperature and the thermo-off temperature, is at least a predetermined value, makes at least one indoor unit, the suction air temperatures of which are between the set temperature and the thermo-off temperature, forcedly thermo-off.

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Tokyo, Japan

Masanao Kotani