Mitsubishi Jukogyo Kabushiki Kaisha

Mitsubishi Heavy Industries Limited

Katsumi Hirooka

Hiroyuki Kobayashi

Susumu Matsuda

Takahisa Hirano

Ryuhei Tanigaki

Tetsuo Ono

Kimiharu Takeda

Hisao Mizuno

Makoto Fujitani

Tetsuzo Ukai

Kazuhiro Sato

Yukio Nagato

Toshiyuki Shikanai

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

A closed-type scroll compressor comprising a closed housing (8) formed with a low-pressure chamber (45) and a high-pressure chamber (44), a scroll-type compression mechanism (C) having a swirling scroll (1) and a fixed scroll (2) and disposed in said low-pressure chamber (45), a frame (6) for fixing said fixed scroll (2) provided with a first oil drainage passage (62), a motor (M) for driving said scroll-type compression mechanism (C) made up of a stator (Mb) provided with a second oil drainage passage (84) and a rotor (Ma), a shaft (5) provided in a second oil drainage passage (52) for transmitting a driving force of said motor (M) to said scroll-type compression mechanism (C), characterized by providing a connection oil drainage passage (93) that is formed by a trough (90) and an inner circumferential surface of said closed housing (8) and whose inlet end is located near an outlet of said first oil drainage passage (62) and whose outlet end is located near an inlet of said second oil drainage passage (84).

Closed-type 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 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 can suppress an increase of inclining vibrations of an Oldham ring with easier adjustments. A stationary scroll (1) and a swivel scroll (2), in a pair, are engaged with each other, and the swivel scroll (2) is driven to make revolutional motions, while being prevented from rotating, via an Oldham ring (18) disposed between an end plate (6) of the swivel scroll (2) and a frame (10). A distance between the end plate (6) of the swivel scroll (2) and the frame (10) is s and a thickness of a ring portion (19) of the Oldham ring (18) is t, A gap .delta., formed as (s-t) and a radius r of said ring portion (19) of the Oldham ring (18) is set so that .delta./r is 0.01 or less. Thus, by only the ring portion (19) of the Oldham ring (18) being adjusted in its thickness, an increase of inclining vibrations of an Oldham ring (18) can be suppressed.

Scroll type fluid machine having a reduced Oldham ring gap

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

An inexpensive, efficient pump which can supply lubricating oil uses the revolving motion of an orbiting scroll 2. The pump is so constructed that a piston supported by a fixing member 1 is fitted in a cylinder chamber 102 formed in the inner surface of the end plate 21 of an orbiting scroll 2 which revolves while sliding on the fixing member, by which a pump chamber 104 is defined between them. The piston 101 is extended or retracted depending on the revolving motion of orbiting scroll 2, the volume of the pump chamber 104 is increased or decreased, and a fluid suction port 105 and a fluid discharge port 106 are connected to the pump chamber 104 at predetermined time intervals to supply the fluid.

Fluid pump and rotary machine having said fluid pump

A rotary compressor is disclosed which is equipped with a bypass hole for bypassing a fluid under compression to the intake side and the capacity thereof is controlled through opening and closing of the bypass hole with a piston which is operated via a control valve, whereby the bypass hole is opened at or in the vicinity of a discharge port of the compressor and the capacity of the compressor is made to be controllable in the range of one hundred to substantially zero percent. By the application of such a rotary compressor to the compressor for an air conditioner, capacity control in the range of about zero to 100% of discharge quantity can be accomplished so that it becomes possible to obtain cooling capability which is in response to the heat load.

Growing community of inventors

Nishikasugai-gun, Japan

Katsumi Hirooka