Mitsubishi Denki Kabushiki Kaisha

Isamu Etou

Mitsuhiro Nishida

Etsuo Morishita

Kiyonori Tokumitsu

Kozaburo Fujii

A scroll machine comprises a pair of scrolls 18, 21 rotating on different axes to form a compression chamber A therebetween and discharging compressed gas in the compression chamber B to a discharge chamber, a pair of boss portions 16b, 17b immersed in lubricant oil for rotatably supporting the respective scrolls through bearing means, a first oil supply path 16c; 43 formed in one of the boss portions for communication with a bearing receiving recess 16d; 17a of the one boss portion, a second oil supply path 18b; 44, 45 formed in one of the scrolls on the side of the one boss portion for communication of the first oil supply path with the compression chamber through the recess, and a pump 33; 42 coupled to a shaft portion of the one scroll for supporting it rotatably within the bearing boss portions and for supplying oil in the discharge chamber to the first oil supply path.

Rotating scroll machine with oil pump

A scroll-type positive displacement apparatus which can be used as a vacuum pump is disclosed. A pair of interfitting scrolls are housed in a first container which communicates with a vacuum chamber to be evacuated by the pump. The scrolls are rotated in synchrony about parallel, nonaligned axis by a drive motor. The scrolls define a plurality of spiral compression chambers which change in size when the scrolls are rotated, compressing a gas contained in the compression chambers. The shaft of one of the scrolls has a discharge port formed therein which communicates between the centermost compression chamber and the inside of a second container which adjoins the first container. The second container is partially filled with lubricating oil and communicates with the atmosphere. The discharge port is equipped with a check valve which permits compressed gas to enter the second container from the scrolls but prevents gas from flowing in the opposite direction. The pump may be further equipped with one or more oil supply passageways formed in the shaft of the scroll in which the discharge port is formed. Lubricating oil is introduced via the oil supply passageway from the second container into one or more of the compression chambers of the pump.

Scroll-type vacuum apparatus with oil supply to a compression chamber

A scroll type positive displacement apparatus which can be used as a vacuum pump is disclosed. A pair of interfitting scrolls are housed in a first container which communicates with a vacuum chamber to be evacuated by the pump. The scrolls are rotated in synchrony about parallel, nonaligned axes by a drive motor. The scrolls define a plurality of spiral compression chambers which change in size when the scrolls are rotated, compressing a gas contained in the compression chambers. The shaft of one of the scrolls has a discharge port formed therein which communicates between the centermost compression chamber and the inside of a second container which adjoins the first container. The second container is partially filled with lubricating oil and communicates with the atmosphere. The discharge port is equipped with a check valve which permits compressed gas to enter the second container from the scrolls but prevents gas from flowing in the opposite direction. The pump may be further equipped with one or more oil supply passageways formed in the shaft of the scroll in which the discharge port is formed. Lubricating oil is introduced via the oil supply passageway from the second container into one or more of the compression chambers of the pump.

Scroll-type vacuum apparatus with rotating scrolls and discharge valve

A scroll-type positive displacement apparatus which can be used as a vacuum pump is disclosed. A pair of interfitting scrolls are housed in a first container which communicates with a vacuum chamber to be evacuated by the pump. The scrolls are rotated in synchrony about parallel, nonaligned axes by a drive motor. The scrolls define a plurality of spiral compression chambers which change in size when the scrolls are rotated, compressing a gas contained in the compression chambers. The shaft of one of the scrolls has a discharge port formed therein which communicates between the centermost compression chamber and the inside of a second container which adjoins the first container. The second container is partially filled with lubricating oil and communicates with the atmosphere. The discharge port is equipped with a check valve which permits compressed gas to enter the second container from the scrolls but prevents gas from flowing in the opposite direction. The pump may be further equipped with one or more oil supply passageways formed in the shaft of the scroll in which the discharge port is formed. Lubricating oil is introduced via the oil supply passageway from the second container into one or more of the compression chambers of the pump.

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Fukuoka, Japan

Isamu Etou