Mitsubishi Heavy Industries Limited

Mitsubishi Jukogyo Kabushiki Kaisha

Susumu Matsuda

Hiroyuki Kobayashi

Katsumi Hirooka

Hajime Sato

Hisao Mizuno

Taichi Tateishi

Makoto Takeuchi

Hiroshi Yamazaki

Shigeki Miura

Takahide Itoh

Yasuharu Maruiwa

Yogo Takasu

Chikako Sasakawa

Yukio Nagato

Yougo Takasu

Jun Akita

Yoshizumi Fujita

Ikuo Esaki

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 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

In a scroll compressor furnished with a fixed scroll and an orbiting scroll, and provided with steps on end plates of the fixed scroll and the orbiting scroll, formed such that the height thereof is high at a central side and low at an outer peripheral end side in a spiral direction of the walls, and with upper rims of the walls formed in a stepped shape corresponding to the steps, gaps are respectively provided between the end plates and upper rims of the walls, and a height of the gaps at room temperature is formed higher than a height under operating conditions. Moreover, the steps are provided at positions which exceeds a pitch angle of &pgr; (rad) along the spiral direction from the outer peripheral end. Furthermore, a concavity is formed in the end plate of the fixed scroll, and a discharge valve is provided in the concavity. Moreover, a plate which is freely movable in an orbit axis direction of the orbiting scroll is arranged, and a pressing device which presses the plate is provided. In addition, a shape of connecting wall faces which connect adjacent parts on one side face of the end plates, is determined by an envelope drawn by an orbit locus of a connecting rim which connects adjacent parts of the upper rims. Furthermore, there is provided a communication passage which communicates between two compression chambers which are developed by contact of the connecting rim and the connecting wall face.

Scroll compressor

The present invention provides a scroll-type compressor that can supply sufficient lubricating oil without the occurrence of seizure of bearing for an orbiting scroll. In this scroll-type compressor, an annular boss extends downward from the orbiting scroll, and an eccentric pin of a rotating shaft fits into the boss via a bearing and an eccentric bush A gap is provided between the eccentric pin and the eccentric bush and an oil supply path is provided between the eccentric bush and the bearing The lubricating oil flows out of an oil supply hole formed in a rotating shaft and the eccentric pin being supplied to the bearing etc. via the oil supply path In order to sufficiently supply the lubricating oil to the oil supply path a portion extending in an arcuate shape from the upper end face of the eccentric bush forms a protrusion extending upward from the other flat portion The protrusion may be formed in an annular shape along the inner peripheral surface of the eccentric bush or a flat plate member may be provided to close the gap from the downside without providing the protrusion

Scroll type compressor having a gap that collects and supplies oil to an oil supply path or the eccentric bearing

The present invention provides a scroll-type compressor that can supply sufficient lubricating oil without the occurrence of seizure of bearing for an orbiting scroll. In this scroll-type compressor, an annular boss 23 extends downward from the orbiting scroll, and an eccentric pin 53 of a rotating shaft 5 fits into the boss 23 via a bearing 73 and an eccentric bush 54. A gap 58 is provided between the eccentric pin 53 and the eccentric bush 54, and an oil supply path 57 is provided between the eccentric bush 54 and the bearing 73. The lubricating oil flows out of an oil supply hole 52 formed in a rotating shaft 5 and the eccentric pin 53, being supplied to the bearing 73, etc. via the oil supply path 57. In order to sufficiently supply the lubricating oil to the oil supply path 57, a portion 54f extending in an arcuate shape from the upper end face of the eccentric bush 54 forms a protrusion extending upward from the other flat portion 54d. The protrusion 54f may be formed in an annular shape along the inner peripheral surface of the eccentric bush 54, or a flat plate member 59 may be provided to close the gap 58 from the downside without providing the protrusion 54f.

Scroll type compressor having an oil supply path for the eccentric

A scroll type fluid machine has a pair of mutually engaged scrolls, one being made of an aluminum material, and the other being made hard. A wear amount of an engaging tip seal and end plate is reduced, and the growth of wear of both elements is equalized. Tip seals (47, 48) are provided at the tips of wraps (12, 16) of the pair of scrolls (10, 14) and are made of a composite plastic material composed of a polyphenylene sulfide as a base material and a carbon fiber, and other materials as filler. The carbon fiber composition rate of the tip seal material of the scroll (10) made of an aluminum material is made higher than the carbon fiber composition rate of the tip seal material of the other scroll (14) made of an aluminum material having a surface treatment or of a ferrous metal or of a ferrous metal having a surface treatment. Thereby the wear amount of each engaging tip seal (47, 48) and end plate (11, 15) is reduced, and simultaneously the growth of wear of both elements is equalized.

Scroll type fluid machine having tip seals of different carbon fiber

Growing community of inventors

Aichi-ken, Japan

Susumu Matsuda