Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Patent
1991-09-03
1993-11-23
Vrablik, John J.
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
418 555, 418 556, 418 57, 418 88, 418 94, 418 99, F04C 1804, F04C 2902
Patent
active
052638227
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to the supply of oil to a bearing portion of a scroll compressor, a fluid passage passing via a back surface portion of a scroll member in connection therewith, and a device for reducing an excessive compression load resulting from the fluid and the fluid passage.
BACKGROUND ART
In a scroll compressor having low vibration and low noise characteristics, an intake chamber is provided at the outer peripheral portion, and a discharge port is provided at the central portion of a volute, and the compressed fluid flows in one direction, and a discharge valve, as used in a reciprocating type compressor or a rotary type compressor to compress the fluid is not needed, and the compression ratio is constant, and depending on operating conditions of the compressor, discharge pulsation is small, and a large discharge space is not needed, and the study for putting it into practical use in various fields has been made.
However, since compression chambers have many sealing portions, a great amount of leakage of the compressed fluid occurs, and particularly in the case of a scroll compressor of a small displacement capacity, such as a cooling medium compressor for home air-conditioning, it is necessary to extremely enhance dimensional accuracies of the volute portion in order to reduce the leakage gap of the compression portion; however, because of complicated shapes of parts and variations in dimensional accuracy of the volute portion, the cost of the scroll gas compressor is high, and variations in performance are large. Particularly, in a low-speed operating condition of the compressor, since the compression time is long, a great amount of gas leakage occurs during the compression, and this compressor has a drawback that its compression efficiency is lower than that of a reciprocating type compressor or a rotary type compressor.
Therefore, as a measure for solving problems of this kind, it is much expected to achieve the optimization of the dimensional accuracy of the volute portion, as well as the improvement of the compression efficiency, by an oil film sealing effect utilizing lubricating oil so as to prevent the gas leakage during the compression, and as disclosed in Japanese Patent Unexamined Publication No. 57-8386, it has been proposed to inject a proper amount of lubricating oil into the compression chambers during the compression to seal a gap of the compression chambers by an oil film of the lubricating oil, thereby improving the above drawback.
Particularly, in the refrigerating air-conditioning field, a scroll cooling medium compressor has been put into practical use, and compressors of a medium- to a large-size class, such as a package air conditioner and a chiller unit, in which a cooling medium volume per suction step is relatively large, have already been mass-produced.
FIG. 1 is an example of a general construction of a scroll cooling medium compressor of a medium- to a large-size 93 class in which the interior of a sealed vessel provides a high-pressure space. In the construction of this Figure, a compression portion and a discharge chamber 1031 are provided at the upper portion, and electrically-operated elements are provided at the lower portion, and an oil reservoir is provided at the bottom portion, and a discharge pipe 1042 serving as a final outlet of the compressor is disposed near the electrically-operated elements. After discharge cooling medium gas and lubricating oil are separated from each other at the discharge chamber 1031, the lubricating oil is returned via oil removal holes 1035 and 1036 to the space accommodating the electrically-operated elements, and is collected in the oil reservoir at the bottom portion, whereas the discharge cooling medium gas passes from the upper portion of the discharge chamber 1031 through another passage 1032 and the space accommodating the electrically-operated elements, and then is again discharged via the discharge pipe 1042. Also, in order to reduce the axial gap of the compression chambers, the lubricating oil a
REFERENCES:
patent: 3994636 (1976-11-01), McCullough et al.
patent: 4365941 (1982-12-01), Tojo et al.
patent: 4596521 (1986-06-01), Murayama et al.
patent: 5037278 (1991-08-01), Fujio et al.
Matsushita Electric - Industrial Co., Ltd.
Vrablik John J.
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