Co-rotating scroll compressor having first and second Oldham couplings
A compressor may include first and second scroll members, a driveshaft, first and second bearings, and first and second Oldham couplings. The scroll members define compression pockets. The first bearing may define a first rotational axis about which the first scroll member rotates. The second bearing may support the second scroll member for rotation about a second rotational axis that is offset from the first rotational axis. The first Oldham coupling may include a first body and a plurality of first keys extending from the first body. The first keys may engage slots formed in the second scroll member. The second Oldham coupling is separate and distinct from the first Oldham coupling. The second Oldham coupling may include a second body and a plurality of second keys extending from the second body. The second keys may engage slots formed in a surface that rotates about the first rotational axis.
1. A compressor comprising:
a shell assembly;
a first scroll member disposed within the shell assembly;
a second scroll member disposed within the shell assembly and cooperating with the first scroll member to define compression pockets;
a driveshaft coupled to the first scroll member and configured to rotate the first scroll member relative to the shell assembly;
a first bearing defining a first rotational axis about which the driveshaft and the first scroll member rotate;
a second bearing spaced apart from the first bearing and supporting the second scroll member for rotation about a second rotational axis that is offset from the first rotational axis;
a first Oldham coupling including a first body and a plurality of first keys extending from the first body, the first keys slidably engaging first slots formed in the second scroll member; and
a second Oldham coupling that is separate and distinct from the first Oldham coupling, the second Oldham coupling including a second body and a plurality of second keys extending from the second body, the second keys slidably engaging second slots formed in a surface of a bearing support member that rotates about the first rotational axis.
2. The compressor of claim 1 , wherein during operation of the compressor, rotation of a center of gravity of the first Oldham coupling is out of phase with rotation of a center of gravity of the second Oldham coupling.
3. The compressor of claim 2 , wherein the centers of gravity of the first and second Oldham couplings rotate at a rotational speed that is greater than a rotational speed of the first and second scroll members.
4. The compressor of claim 1 , wherein the surface in which the second slots are formed is an axially facing surface of the bearing support member, and wherein the bearing support member is rotationally fixed relative to the first scroll member.
5. The compressor of claim 4 , wherein:
the first and second bodies of the first and second Oldham couplings are annular bodies that extend around a hub of the second scroll member,
the hub extends from a first side of an end plate of the second scroll member, and
a spiral wrap extends from a second side of the end plate of the second scroll member.
6. The compressor of claim 1 , wherein the first keys of the first Oldham coupling extend from the first body in first and second opposite directions, and wherein the second keys of the second Oldham coupling extend from the second body in first and second opposite directions.
7. The compressor of claim 6 , wherein the first keys are disposed 180 degrees apart from each other, and wherein the second keys are disposed 180 degrees apart from each other.
8. The compressor of claim 1 , wherein the first Oldham coupling includes third keys extending from the first body, and wherein the second Oldham coupling includes fourth keys extending from the second body.
9. The compressor of claim 8 , wherein:
the first keys of the first Oldham coupling extend from the first body in a first direction,
the third keys of the first Oldham coupling extend from the first body in a second direction that is opposite the first direction,
the second keys of the second Oldham coupling extend from the second body in the second direction, and
the fourth keys of the second Oldham coupling extend from the second body in the first direction.
10. The compressor of claim 9 , wherein:
the first keys are disposed 180 degrees apart from each other,
the second keys are disposed 180 degrees apart from each other,
the third keys are disposed 180 degrees apart from each other, and
the fourth keys are disposed 180 degrees apart from each other.
11. A compressor comprising:
a shell assembly;
a first bearing support member fixed relative to the shell assembly and including a first cylindrical surface and a second cylindrical surface that is eccentric relative to the first cylindrical surface;
a first scroll member rotatable relative to the first bearing support member about a first rotational axis defined by the first cylindrical surface;
a second scroll member cooperating with the first scroll member to define compression pockets, the second scroll member is rotatable relative to the first bearing support member about a second rotational axis defined by the second cylindrical surface;
a first Oldham coupling including a first body and a plurality of first keys extending from the first body, the first keys slidably engaging first slots formed in the second scroll member; and
a second Oldham coupling that is separate and distinct from the first Oldham coupling, the second Oldham coupling including a second body and a plurality of second keys extending from the second body, the second keys slidably engaging second slots formed in a surface of a second bearing support member that rotates about the first rotational axis.
12. The compressor of claim 11 , wherein during operation of the compressor, rotation of a center of gravity of the first Oldham coupling is out of phase with rotation of a center of gravity of the second Oldham coupling.
13. The compressor of claim 12 , wherein the centers of gravity of the first and second Oldham couplings rotate at a rotational speed that is greater than a rotational speed of the first and second scroll members.
14. The compressor of claim 11 , wherein:
the surface in which the second slots are formed is an axially facing surface of the second bearing support member,
the second bearing support member is rotationally fixed relative to the first scroll member,
the compressor includes a first bearing and a second bearing,
the first bearing is attached to the second bearing support member and the first cylindrical surface of the first bearing support member, and
the second bearing surrounds the second cylindrical surface of the first bearing support member and is disposed within a cavity of the second bearing support member.
15. The compressor of claim 14 , wherein:
the first and second bodies of the first and second Oldham couplings are annular bodies that extend around a hub of the second scroll member,
the hub extends from a first side of an end plate of the second scroll member, and
a spiral wrap extends from a second side of the end plate of the second scroll member.
16. The compressor of claim 11 , wherein the first keys of the first Oldham coupling extend from the first body in first and second opposite directions, and wherein the second keys of the second Oldham coupling extend from the second body in first and second opposite directions.
17. The compressor of claim 16 , wherein the first keys are disposed 180 degrees apart from each other, and wherein the second keys are disposed 180 degrees apart from each other.
18. The compressor of claim 11 , wherein the first Oldham coupling includes third keys extending from the first body, and wherein the second Oldham coupling includes fourth keys extending from the second body.
19. The compressor of claim 18 , wherein:
the first keys of the first Oldham coupling extend from the first body in a first direction,
the third keys of the first Oldham coupling extend from the first body in a second direction that is opposite the first direction,
the second keys of the second Oldham coupling extend from the second body in the second direction, and
the fourth keys of the second Oldham coupling extend from the second body in the first direction.
20. The compressor of claim 19 , wherein:
the first keys are disposed 180 degrees apart from each other,
the second keys are disposed 180 degrees apart from each other,
the third keys are disposed 180 degrees apart from each other, and
the fourth keys are disposed 180 degrees apart from each other.