Hitachi, Ltd.

Johnson Controls-hitachi Air Conditioning Technology (hong Kong) Limited

Masahiro Takebayashi

Hirokatsu Kohsokabe

Isao Hayase

Hiroaki Hata

Koichi Inaba

Kenji Tojo

Shunichi Mitsuya

Kenichi Oshima

Isamu Tsubono

Koichi Sekiguchi

Kazuo Sekigami

Atsushi Shimada

Takehiro Akizawa

Hiroshi Iwata

Shigetaro Tagawa

Yasuhiro Ohshima

Shigeru Machida

Kunihiko Takao

Takeshi Kouno

Yuji Yoshitomi

Masahiko Sugiyama

Kazuya Matsuo

Yasuhiro Oshima

Eisuke Kato

Ryuichiro Yonemoto

Akio Sakazume

Yasuaki Iizuka

Shu Kuriyama

Kingo Moriyama

Yoshishige Endo

Nobuo Abe

Masaki Koyama

Toshiyuki Terai

Kazuo Ikeda

Hirokatu Kousokabe

Yoshihisa Uneyama

Mitsuru Murata

Shigetaroo Tagawa

A screw compressor and a chiller unit are provided. An oil separator of the screw compressor may include an outer cylinder, an inner cylinder positioned inside the outer cylinder, and an introducing flow path. The upper end of the inner cylinder is held by the oil separator and the outer wall of the inner cylinder is held independently of the inner wall of the outer cylinder. The diameter of the inner wall of the outer cylinder may gradually be reduced along the swirl flow path. The refrigerant via the introducing passage swirls and goes down along the swirl flow path and is separated into gas refrigerant and oil. The separated gas refrigerant flows from the lower end of the inner cylinder into the inner cylinder and goes up, and the separated oil flows down along the inner wall surface of the outer cylinder.

Screw compressor and chiller unit provided with same

A screw compressor is disclosed, which includes a male rotor and a female rotor and an oil separator. The oil separator includes an outer cylinder, an inner cylinder located inside the outer cylinder, and an introducing flow path. An upper end portion of the inner cylinder is held by the oil separator and an outer wall of the inner cylinder is held independently of the inner wall of the outer cylinder. A diameter of an inner wall of the outer cylinder is configured so that the diameter is gradually reduced along a swirl flow path. Moreover, refrigerant that flowed in swirls and goes down along the swirl flow path. The separated gas refrigerant flows from a lower end portion of the inner cylinder into the inner cylinder and goes up and the separated oil flowing down along the inner wall surface of the outer cylinder.

There is provided a scroll compressor having high overall adiabatic efficiency and reliability in a wide pressure operating range. A backside excess-suction-pressure region is provided such that pressure higher than suction pressure by a constant value is applied to a backside of scroll members to produce an attractive force to attract both scroll members. A control bypass is also provided for communicating compression chambers with a discharge system only when pressure in the compression chambers is high.

Scroll compressor having a valved back pressure chamber and a bypass for overcompression

Scroll compressor

Scroll compressor having a back-pressure chamber control valve

There is provided a scroll compressor having high overall efficiency and reliability in a wide pressure operating range. A backside excess-suction-pressure region is provided such that pressure higher than suction pressure by a constant value is applied to a backside of scroll members to produce an attractive force to attract both scroll members. A control bypass is also provided for communicating compression chambers with a discharge system only when pressure in the compression chambers is high.

Scroll compressor having a valved back-pressure chamber and a bypass for over-compression

A scroll compressor comprising: a vessel; a compressing mechanism provided within said vessel, the compressing mechanism comprising an orbiting scroll and a non-orbiting scroll each having a spiral wrap formed in a base plate and an Oldham ring for preventing the orbiting scroll from rotating around its axis; an oil reservoir provided within a vessel; a crankshaft for transmitting a power for compressing a working fluid; and a frame on which a main bearing for supporting the crankshaft is provided, wherein the crankshaft is provided with oil supply passages for communicating a vicinity of an orbiting bearing and a vicinity of the main bearing, and openings of the oil supply passages in the vicinity of the orbiting bearing and in the vicinity of the main bearing are positioned so that a pressure of an oil film in the orbiting bearing opening generated during an operation of the compressor is higher than a pressure of an oil film in the-main bearing opening generated during an operation of the compressor.

A displacement type fluid machine has a sliding contact portion between a cylinder and a displacer made into a predetermined section, and the cylinder and the displacer so contoured that when they are made concentric, the normal distance in the sliding contact section between the cylinder contour and the displacer contour may be smaller than that of the remaining section, thereby to decrease the radial gap to lower the internal leakage of the working fluid and to improve the performance and the reliability.

Displacement type fluid machine

A displacement type fluid machine which is easier to machine and assemble than a scroll type fluid machine and has high performance and low cost. A displacer is revolved in a cylinder having an inside wall formed by a curve such that a planar shape is continuous, whereby a working fluid is discharged through a plurality of discharge ports, there is provided a driving unit in which the orbiting radius of the displacer is variable along the shape of a movement line contact portion of the cylinder and the displacer.

Displacement type fluid machine having an orbiting displacer forming a plurality of spaces

A displacement type fluid machine for reducing a fluid loss of a discharge process as much as that of a scroll fluid machine has a displacer which is provided with at least one through hole for working the outer wall surface of said displacer during manufacture of said displacer, said at least one through hole extending in an axial direction of a rotating shaft.

Displacement type fluid machine having an orbiting displacer forming a plurality of spaces and method for manufacturing same

In a displacement type fluid machine wherein a space is formed by the inner wall surface of a cylinder and the outer wall surface of a displacer when the center of the cylinder is located on the center of the displacer, and a plurality of working chambers is formed when the positional relationship between the displacer and cylinder is for a gyration, the wear is reduced between the cylinder and displacer. Sliding portions between the displacer,and a cylinder,are fed with a lubricating oil,by forming an oil-feeding groove,in the surface of the displacer,so as to extend from the central portion of the displacer,to the vicinity of a suction port,, and feeding the lubricating oil,from the central portion of the displacer,, so that the wear can be reduced.

An orbiting fluid machine has a feature that the speed of sliding movement is low, while vibrations are small, its performance is lowered when the rotational speed becomes high, and this problem is resolved by the following structure. A displacement fluid machine includes a displacer making an orbital motion within a casing into which a working fluid is drawn, thereby drawing and discharging the working fluid, in which an oil retaining mechanism or a seal mechanism is provided at each of opposite end surfaces of the displacer. This results that, axial gaps at the end surfaces of the displacer are effectively sealed so as to reduce a leakage loss, thereby achieving a high performance and a high reliability.

Displacement fluid machine

Growing community of inventors

Tokyo, Japan

Masahiro Takebayashi