Claims
- 1. A scroll-type fluid machine comprising:
- a first vessel which has a suction port;
- a second vessel which is hermetically connected to said first vessel, which has an exhaust port, and which is partially filled to a level with lubricating oil;
- a first scroll which is disposed in said first vessel and which has at its center a discharge port which communicates with the interior of said second vessel beneath the level of the oil;
- a second scroll which is combined with said first scroll so as to define at least one compression chamber;
- drive means for rotating at least one of said scrolls so that said compression chamber is moved from a position in which it communicates with said suction port to a position in which it communicates with said discharge port and which at the same time is decreased in volume;
- a first check valve which blocks reverse flow through said discharge port; and
- oil supply means for supplying the lubricating oil from said second vessel to the inside of the compression chamber, the compression chamber not communicating with the inside of said first vessel when oil is supplied thereto by said oil supply means.
- 2. A scroll-type fluid machine as claimed in claim 1 wherein said drive means comprises means for rotating both said first and second scrolls about parallel but nonaligned axes.
- 3. A scroll-type fluid machine as claimed in claim 1 wherein said oil supply means comprises an oil supply passageway which is formed in said first scroll, said oil supply passageway having a first end which communicates with the inside of said second vessel beneath the level of the lubricating oil and a second end which opens onto the inside of the compression chamber.
- 4. A scroll-type fluid machine as claimed in claim 3 wherein said oil supply passageway opens onto the inside of the compression chamber in the vicinity of said discharge port.
- 5. A scroll-type positive displacement apparatus comprising:
- a first container which communicates with a vacuum chamber which is to be evacuated;
- a second container which adjoins said first container and communicates with the atmosphere and is partially filled with oil;
- a first scroll which is disposed in said first container and comprises a flat, disk-shaped end plate, a spiral wrap which extends perpendicularly from one side of said end plate, and a shaft which extends perpendicularly from the opposite side of said end plate and extends into said second container, said first scroll having a discharge port formed at approximately the center of said end plate, said discharge port opening onto said one side of said end plate and communicating with the inside of said second container through the center of said shaft;
- a second scroll which is disposed in said first container and comprises a flat, disk-shaped end plate which is parallel to the end plate of said first scroll, a spiral wrap which extends perpendicularly from one side of the end plate of said second scroll, and a shaft which extends perpendicularly from the opposite side of the end plate of said second scroll and is parallel to but nonaligned with the shaft of said first scroll, said first scroll and said second scroll interfitting with one another so as to define a plurality of compression chambers, the outermost of which communicate with the inside of said first container and the innermost of which communicate with said discharge port;
- drive means for rotating said first and second scrolls in synchrony about their respective axes; and
- valve means for enabling compressed gas to flow through said discharge port from said scrolls into said second container but not in the opposite direction;
- oil supply means for supplying said oil from said second container to the inside of at least one of said compression chambers, the compression chamber which is supplied with oil not communicating with the inside of said first container.
- 6. A scroll-type positive displacement apparatus as claimed in claim 1, wherein said oil supply means comprises an oil supply passageway which is formed in the shaft of said first scroll, one end of said oil supply passageway communicating with the inside of said second container below the surface of said oil, the other end of said oil supply passageway opening onto one of said compression chambers.
- 7. A scroll-type positive displacement apparatus as claimed in claim 6, wherein said oil supply passageway opens onto one of said compression chambers in the vicinity of said discharge port.
- 8. A scroll-type positive displacement apparatus as claimed in claim 6 wherein:
- said oil supply passageway opens onto the centermost of said compression chambers during a portion of each rotational cycle of said scrolls; and
- the transverse cross-sectional area of said oil supply passageway is such that the volume of oil which is introduced through said oil supply passageway into said centermost compression chamber in each rotation of said scrolls is approximately equal to the volume of said centermost compression chamber at the moment when said oil supply passageway first opens onto said centermost compression chamber during each cycle.
Priority Claims (3)
Number |
Date |
Country |
Kind |
61-226976 |
Sep 1986 |
JPX |
|
62-79001 |
Mar 1987 |
JPX |
|
62-179357 |
Jul 1987 |
JPX |
|
Parent Case Info
This application is a division of application Ser. No. 098,961, filed Sept. 21, 1987, now U.S. Pat. No. 4,846,640.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4735559 |
Morishita et al. |
Apr 1988 |
|
Foreign Referenced Citations (3)
Number |
Date |
Country |
58-170876 |
Oct 1983 |
JPX |
59-185892 |
Oct 1984 |
JPX |
372124 |
Nov 1963 |
CHX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
98961 |
Sep 1987 |
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