Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Patent
1996-12-31
1998-10-20
Vrablik, John J.
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
418 57, F04C 1804
Patent
active
058237577
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an axial sealing apparatus for a scroll type compressor, and particularly to an improved axial sealing apparatus for a scroll type compressor which is capable of constantly maintaining pressure in a back pressure chamber by forming a back pressure hole at a predetermined portion in which the back pressure hole is opened before a compressed gas is discharged and the back pressure hole is closed after the compressed gas is substantially closed, whereby a more stable axial direction sealing can be obtained throughout the entire operation time of a scroll compressor.
BACKGROUND ART
FIG. 1 shows a conventional scroll type compressor, which includes a compression mechanism section 30 provided at an inner upper portion of a compressor main body 1 and a motor mechanism section 40 provided at an inner lower portion of the same.
The compression mechanism section 30 includes a stationary scroll 2, a rotational scroll 3 engaged to a lower portion of the stationary scroll 2 so as to define a compression chamber therebetween, and a main frame 4 positioned at a lower portion of the rotational scroll 3 and directed to supporting the stationary scroll 2.
Here, as shown in FIG. 2, the stationary scroll 2 is movable toward the direction of a rotary shaft 5 in a state that the stationary scroll 2 is engaged to a leaf spring 11 engaged to the main frame 4 in cooperation with a bolt 12.
Meanwhile, the motor mechanism section 40 includes a rotor 6 tightly inserted onto the rotary shaft 5, and a stator 7 spaced apart from the outer surface of the rotor 6.
The rotary shaft 5 is rotated in cooperation with a electromagnetic operation between the stator 7 and the rotor 6.
Meanwhile, the upper portion of the rotary shaft 5 is eccentrically engaged with the rotational scroll 3.
In the drawings, reference numeral 8 denotes an oldham coupling which serves to prevent a rotation of a rotational scroll 3, and 10 denotes a suction tube through which a refrigerant gas is introduced.
The conventional scroll type compressor is directed to introducing a refrigerant gas sucked thereto from the suction tube 10 into the interior of two new-moon-shaped compression chambers 25 and 26 which are defined between the rotational scroll 3 and the stationary scroll 2 as shown in FIGS. 3A through 3C when the rotational scroll 3 is rotated.
Continuously, the volume of the compression chambers 25 and 26 is decreased, and then the refrigerant gas is compressed as the refrigerant gas flows toward the center of the compression chambers 25 and 26.
At this time, in a built-in type scroll compressor in which a discharge operation is performed a predetermined volume is obtained without valve during a discharge cycle of a refrigerant gas, when both end portions of two compression chambers 25 and 26 come into hermetic contact with each other as the rotational scroll 3 is rotated, a discharging hole 15 is opened and then the compressed refrigerant gas is discharged therethrough.
Therefore, in the scroll compressor which is generally operated under various operating conditions, when the pressure of gas which is compressed until the discharge starts is higher than the discharge pressure, the discharge occurs. But, when the pressure of gas which is compressed until the discharge starts is lower than the discharge pressure, the gas is reversely flown into the compression chambers 25 and 26, so that the pressure in the compression chambers 25 and 26 is sharply increased, and then becomes higher than the discharge pressure.
Therefore, as shown in FIG. 4B, various compression curves are obtained in accordance with a predetermined operating condition.
Meanwhile, during the compression process of the conventional scroll compressor, refrigerant gas leakage occurs. The leakage is generally classified into two parts. Of which, one is referred to a tangential direction leakage which occurs in a tangential direction about side surface of a scroll wrap 2' of the stationary scroll 2 and the scroll wrap 3' of the rotational scroll 3
REFERENCES:
patent: 4365941 (1982-12-01), Tojo et al.
patent: 4475874 (1984-10-01), Sato
patent: 4557675 (1985-12-01), Murayama et al.
patent: 4795322 (1989-01-01), Etemad et al.
patent: 5474433 (1995-12-01), Chang et al.
patent: 5482450 (1996-01-01), Caillat et al.
LG Electronics Inc.
Vrablik John J.
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