Scroll-type fluid displacement apparatus with fully compliant floating scrolls
First Claim
Patent Images
1. A positive fluid displacement apparatus, comprising:
- a) at least one orbiting scroll member with a first end plate having a first spiral wrap affixed to a base surface of said first end plate and three generally equally-spaced peripheral portions at said first end plate;
b) at least one stationary scroll member with a second end plate having a second spiral wrap affixed to a base surface of said second end plate of said stationary scroll member, said second spiral wrap engaged with said first spiral wrap of said orbiting scroll member, wherein when said orbiting scroll member orbits with respect to said stationary scroll member the flanks of said engaging wraps along with said base surface of said first end plate of said orbiting scroll member and said base surface of said second end plate of said stationary scroll member define moving pockets of variable volume and zones of high and low fluid pressures;
c) a rotatable shaft arranged to drive said orbiting scroll member to experience orbiting motion with respect to said stationary scroll member;
d) a housing, said housing supporting said stationary scroll member, and supporting said shaft within a central portion of said housing;
said housing having three peripheral portions spaced corresponding to said peripheral portions at said orbiting scroll end plate;
e) three crank handles, each rotatably supported by a corresponding one of said peripheral portions of said housing; and
f) a radial compliant link connecting said shaft to said orbiting scroll member via a sliding knuckle and connecting said crank handles to said peripheral portions of said orbiting scroll member via a swing link mechanism to maintain a predetermined angular relationship between said scroll members and to allow said orbiting scroll member to be able to swing radially to effect tangential sealing between said spiral wraps making moving line contact as said orbiting scroll member is driven.
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Abstract
A central drive shaft-sliding knuckle combined with a peripheral crank pin-swing link mechanism (CSPS) to provide an orbiting scroll with radial and axial compliant capability. The CSPS mechanism can be applied to both dual floating scroll and single floating scroll structures to improve performances of scroll devices, particularly in oil-free operations. In addition, an orbiting dual thrust ball bearing mechanism is provided to take thrust load in, for example, a floating scroll compressor with a CSPS mechanism.
66 Citations
20 Claims
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1. A positive fluid displacement apparatus, comprising:
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a) at least one orbiting scroll member with a first end plate having a first spiral wrap affixed to a base surface of said first end plate and three generally equally-spaced peripheral portions at said first end plate;
b) at least one stationary scroll member with a second end plate having a second spiral wrap affixed to a base surface of said second end plate of said stationary scroll member, said second spiral wrap engaged with said first spiral wrap of said orbiting scroll member, wherein when said orbiting scroll member orbits with respect to said stationary scroll member the flanks of said engaging wraps along with said base surface of said first end plate of said orbiting scroll member and said base surface of said second end plate of said stationary scroll member define moving pockets of variable volume and zones of high and low fluid pressures;
c) a rotatable shaft arranged to drive said orbiting scroll member to experience orbiting motion with respect to said stationary scroll member;
d) a housing, said housing supporting said stationary scroll member, and supporting said shaft within a central portion of said housing;
said housing having three peripheral portions spaced corresponding to said peripheral portions at said orbiting scroll end plate;
e) three crank handles, each rotatably supported by a corresponding one of said peripheral portions of said housing; and
f) a radial compliant link connecting said shaft to said orbiting scroll member via a sliding knuckle and connecting said crank handles to said peripheral portions of said orbiting scroll member via a swing link mechanism to maintain a predetermined angular relationship between said scroll members and to allow said orbiting scroll member to be able to swing radially to effect tangential sealing between said spiral wraps making moving line contact as said orbiting scroll member is driven. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An orbiting dual thrust ball bearing mechanism, comprising two thrust ball bearings including:
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a) a fixed thrust ball bearing having a first stationary washer and a first rotating washer capable of rotating around its own axis, and first balls with a first cage located between said first stationary and rotating washers;
b) an orbiting thrust ball bearing having a second stationary washer and a second rotating washer capable of rotating around its own axis, and second balls with a second cage located between said second washers;
c) said second stationary washer capable to make orbiting motion relative to said first stationary washer, d) said first and second rotating washers having back to back contact and capable of making sliding motion relative to each other; and
e) said fixed and orbiting thrust ball bearings capable of bearing thrust loads transferred from said second stationary washer to said second balls, then to said second rotating washer, then to said first rotating washer, and then to said first balls and finally to said first stationary washer, or vice versa. - View Dependent Claims (15, 16, 17)
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18. A positive fluid displacement apparatus, comprising:
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a) at least one orbiting scroll member with a first end plate having a first spiral wrap affixed to a base surface of said first end plate and three generally equally-spaced peripheral portions at said first end plate;
b) at least one stationary scroll member with a second end plate having a second spiral wrap affixed to a base surface of said second end plate of said stationary scroll member, said second spiral wrap engaged with said first spiral wrap of said orbiting scroll member, wherein when said orbiting scroll member orbits with respect to said stationary scroll member the flanks of said engaging wraps along with said base surface of said first end plate of said orbiting scroll member and said base surface of said second end plate of said stationary scroll member define moving pockets of variable volume and zones of high and low fluid pressures;
c) a rotatable shaft arranged to drive said orbiting scroll member to experience orbiting motion with respect to said stationary scroll member;
d) a housing, said housing supporting said stationary scroll member, and supporting said shaft within a central portion of said housing;
said housing having three peripheral portions spaced corresponding to said peripheral portions at said orbiting scroll end plate;
e) at least one orbiting dual thrust ball bearing mechanism that includes a fixed thrust ball bearing and an orbiting thrust ball bearing;
f) said fixed thrust ball bearing having a first stationary washer fixed to a stationary part of said apparatus, a first rotating washer capable of rotating around its own axis, and first balls with a first cage located between said first stationary and orbiting washers;
g) said orbiting thrust ball bearing having a second stationary washer fixed to said orbiting scroll member, a second rotating washer capable of rotating around its own axis, and second balls with a second cage located between said second stationary and orbiting washers;
h) said first and second rotating washers having back to back contact and capable of making sliding motion relative to each other; and
i) said fixed and orbiting thrust ball bearings capable of bearing thrust loads transferred from said second stationary washer to said second balls, then to said second rotating washer, then to said first rotating washer, and then to said first balls and finally to said first stationary washer, or vice versa. - View Dependent Claims (19, 20)
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Specification