Mitsubishi Heavy Industries Limited

Mitsubishi Heavy Industries Thermal Systems, Ltd.

Taichi Tateishi

Hajime Sato

Yoshiyuki Kimata

Naoki Kobayashi

Kosuke Nakamura

Makoto Ogawa

Takuya Okada

Takuma Yamashita

Hisao Mizuno

Susumu Matsuda

Yoshiaki Miyamoto

Yogo Takasu

Toyotaka Hirao

Masahiro Taniguchi

Kazuki Takahashi

Minemasa Omura

Akihiro Kanai

Yougo Takasu

Akihiro Noguchi

Masashi Hamano

Yoshiyuki Okada

Ikuo Esaki

Youhei Hotta

Emiri Uchikawa

Toshiyuki Hokazono

Takao Ishimoto

A power generation system includes a first on-off valve that, with respect to a maintenance target device including at least one of a circulation pump, an evaporator, an expander, and a condenser in a medium circuit through which a medium with a boiling point lower than that of water circulates, is on an upstream side in a flow direction of the medium in the medium circuit, and is capable of shutting off the flow of the medium; a second on-off valve that is on a downstream side in the flow direction of the medium in the medium circuit, and is capable of shutting off the flow of the medium; a port that is communicable with the medium circuit between the first on-off valve and the second on-off valve; and a third on-off valve that is in the port.

Power generation system, and maintenance method for power generation system

A scroll compressor having an improved compression efficiency by optimizing a step mesh gap in an operating state is provided. The scroll compressor having a step-like shape has a step-mesh-gap set value occurring between step side surfaces of a connecting wall of a fixed scroll and a connecting edge of a revolving scroll and a step-mesh-gap set value occurring between step side surfaces of a connecting walls of the revolving scroll and a connecting edge of the fixed scroll, and a fixed-side set value for when the two move close together due to the revolving scroll tilting by receiving gas pressure during operation is set greater than that for when the two move apart.

Stepped scroll compressor with changing step mesh gaps

A scroll compressor (CP) in which the cylinder oil circulation rate of lubricant is optimized during the operation to improve the compression efficiency is provided. In the scroll compressor (CP) having a stepped shape, the cylinder oil circulation rate of lubricant taken into the scroll compressor (CP) and circulated together with refrigerant is set to fall within the range from 1% or more to 10% or less.

Scroll compressor having optimized cylinder oil circulation rate of lubricant

A scroll compressor performing three-dimensional compressions, which can optimize a tip clearance in operation while considering a thermal expansion and a pressure deformation and which can reduce a compression leakage to improve a compression efficiency thereby to realize a high performance. The leading end faces (and) and the bottom face of a spiral wrap () have a step portion (), and the wrap height on the outer circumference side of the spiral wrap () is made larger than that on the inner circumference side wrap height. The spiral wrap () on the inner circumference side with respect to the step portion () is stepwise or continuously made gradually lower toward the center side of the spiral wrap (), and the tip clearance (&#x394;i) of the spiral wrap on the inner circumference side with respect to the step portion () is made gradually larger toward the center side of the spiral wrap ().

Scroll compressor having a gradually changing tip clearance

A scroll compressor prevents the rotation of an orbiting scroll and reduces manufacturing cost. This scroll compressor has a housing, a fixed scroll having a first end plate and a first spiral wall body, an orbiting scroll having a second end plate and a second spiral wall body, rotation-preventing portions provided for at least one of the housing and the orbiting scroll, which allow the orbiting scroll to revolve while preventing the rotation thereof, a wall body shoulder portion formed along an upper edge of the second spiral wall body, and a step portion formed on the first end plate. In this scroll compressor, the shoulder portion and the step portion contact with and slide along each other, and a phase at which the shoulder portion is disposed to the center of the orbiting scroll is different from phases at which the rotation-preventing portions are disposed.

Scroll compressor having shoulder and rotation-preventing portions positioned as different phases

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Aichi, Japan

Taichi Tateishi