Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Patent
1998-12-06
1995-09-05
Vrablik, John J.
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
418 57, 29888022, F04C 1804
Patent
active
054474191
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a scroll-type compressor and, more particularly, to a scroll-type compressor which is not damaged even when rotated in the reverse direction.
BACKGROUND ART
FIGS. 18 to 20 are sectional views of the main portion of a conventional scroll-type compressor of a first type disclosed for example in Japanese Patent Laid-Open No. 59-120794, in which 1 is a stationary scroll, 2 is an orbiting scroll defining a compression chamber together with the stationary scroll 1, 23 is a thrust surface of the orbiting scroll 2 at the side opposite to the compression chamber, 24 is an orbiting shaft disposed at the center of the thrust surface 23, 3 is a frame journaling the thrust surface 23 of the orbiting scroll 2, 5 is a main shaft for transmitting a drive force to the orbiting scroll 2, 27 is a motor for driving the main shaft 5, 7 is a slider rotatably accommodated within the orbiting bearing, 31 is a point of contact at which the stationary scroll 1 and the orbiting scroll 2 contact, 8 is a discharge valve disposed at a position for discharging the refrigerant, 21a is a load direction surface of a slider sliding surface and 21b is a non-load direction surface of the slider sliding surface.
The operation will now be described. The drive force of the motor 27 is transmitted to the main shaft 5, the slider 7 is rotated by the rotation of the main shaft 5 while maintaining a constant revolution radius r and is slidable along the contact surface between the slider 7 and the main shaft 5, so that the rotation of the slider 7 causes the orbiting scroll 2 to repeat orbiting motion at a constant revolution radius r, whereby a volume defined between the stationary scroll 1 and the orbiting scroll 2 decreases to compress the refrigerant which is then discharged from the discharge valve 8. The discharge valve 8 also functions as a check valve.
In FIG. 19, a resultant force F of a centrifugal force Fc on the slider 7 and a gas load force Fg generated by the compression acts on the slider 7, so that the slider 7 is moved along the sliding surface 21 in the direction along which the revolution radius is increased to urge the orbiting scroll 2 against the stationary scroll 1, whereby no clearance is generated at the point of contact 31 between the orbiting scroll 2 and the stationary scroll 1 and a compression with only a small leakage can be achieved.
FIG. 21 is a longitudinal sectional view illustrating the conventional scroll-type compressor of the second type disclosed in Japanese Patent Application No. 2-29127 filed previously by the applicant of the present application and FIG. 22 is a sectional view of the main portion of the structure shown in FIG. 21 and illustrating forces acting upon the main portion during the motor forward rotation. In FIG. 21, 1 is a stationary scroll, 2 is an orbiting scroll, 2a is a base plate for the orbiting scroll 2, 2b is an orbiting bearing disposed on the base plate 2a at the center of the non-compression chamber side, 3 is a frame fixed to the stationary scroll 1 by means of a bolt or the like, 4 is a ring-shaped Oldham's ring for preventing spinning of the orbiting scroll 1 and for connecting it to the frame 3 for the revolution movement in the radial direction, 5 is a main shaft having formed at its top end an eccentric slider mounting shaft 6 having a flat surface 6a and a flat surface 6b parallel to the axis of the main shaft 5, the slider mounting shaft 6 having mounted thereon a slider 7 so that it is not rotatable but slidable along a plane perpendicular to the axis of the main shaft 5 and it is fitted by the orbiting bearing 2b in an eccentric state relative to the axis of the main shaft 5. 8 is a discharge valve which also functions as a check valve.
Also, in FIG. 22, 7a is a fitting hole formed in the slider 7 for receiving the slider mounting shaft 6 therein, 7b is a sliding surface of the slider 7 and 7c is an opposite sliding surface. r is an eccentricity amount or a distance between the axis of the main shaft 5 (the center of the stationa
REFERENCES:
patent: 5017107 (1991-05-01), Fraer, Jr. et al.
patent: 5199862 (1993-04-01), Kondo et al.
Hagiwara Masaji
Ikeda Kiyoharu
Ishii Minoru
Ogawa Hiroshi
Sugita Tatsuya
Mitsubishi Denki & Kabushiki Kaisha
Vrablik John J.
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