Kobe Steel, Ltd.

Toru Noguchi

Shoji Yoshimura

A water injection type screw compressor wherein gas sucked from an intake flow is supplied to a rotor chamber, compressed and discharged into a discharge channel as compressed fluid together with water supplied to the rotor chamber, comprises a water separator disposed in the discharge channel to separate water and gas from compressed fluid, a water channel connecting the water separator to a compressor main body for supplying the rotor chamber with the water separated in the water separator, and an oil circulation channel including an oil pump, an oil filter, and a housing for storing oil for supplying the oil to where lubrication is needed. Further, a part of the water channel is arranged passing through an oil trap formed at the bottom inside the housing for storing oil. Thus, oil temperature increases can be minimized in simplified structure having no oil cooling means such as an oil cooler.

Water injection type screw compressor

A screw fluid machine has a first non-contact seal, a second non-contact seal and a lip seal disposed between a rotor chamber and a bearing for a rotor shaft located on the high pressure side, and in this order from the rotor chamber side. It includes a pressurized communicating channel for introducing high-pressure target gas into a pressurized space formed between the first and second non-contact seals, a pressurized pressure detecting device for detecting the pressure of the pressurized space, and an alarm device for generating an alarm when a value detected by the pressurized pressure detecting device falls out of a predefined range of pressurized pressures. The screw fluid machine is capable of detecting or predicting a condition of the shaft sealing device and accurately and reliably reporting the detected condition to an operator.

Water injection type screw fluid machine

A water-lubrication type screw fluid machine has a first non-contact seal, a second non-contact seal and a lip seal disposed between a rotor chamber and a bearing for a rotor shaft. The bearing is located on the high pressure side and in this order from the rotor chamber side. the bearing includes a low pressure communicating channel for allowing an outflow space formed on the rotor chamber side with respect to the first non-contact seal to communicate with a low pressure channel for the target gas communicating with a low pressure space inside the rotor chamber or the rotor chamber, a pressurized communicating channel for introducing high-pressure target gas into a pressurized space formed between the first and second non-contact seals, and an open communicating channel through which an open space formed between the second non-contact seal and the lip seal opens to the outside of the casing.

Screw compressor

A screw compressor is disclosed wherein a pair of rotor shafts are disposed horizontally and an oil sump is formed at the bottom of a bearing casing which accommodates bearings for supporting the rotor shafts, a bearing lower portion being soaked into oil present in the oil sump for lubrication. The screw compressor comprises a chamber provided separately from the bearing casing, an oil line for communication between the oil sump in the bearing casing and the chamber and oil level detecting means disposed in the chamber. According to this structure, the oil level in the bearing casing can be checked accurately and there is no fear of oil shortage in the bearings.

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Kako-gun, Japan

Toru Noguchi