US 12,448,971 B2
Compact low noise rotary compressor
Kang P. Lee, Sudbury, MA (US); and Douglas S. Olsen, Natick, MA (US)
Assigned to ASPEN COMPRESSOR, LLC, Marlborough, MA (US)
Filed by ASPEN COMPRESSOR, LLC, Marlborough, MA (US)
Filed on Jun. 1, 2020, as Appl. No. 16/889,055.
Application 16/889,055 is a continuation of application No. 15/100,876, granted, now 10,670,017, previously published as PCT/US2014/067933, filed on Dec. 1, 2014.
Claims priority of provisional application 61/910,357, filed on Dec. 1, 2013.
Prior Publication US 2020/0300247 A1, Sep. 24, 2020
Int. Cl. F04C 29/06 (2006.01); F04C 18/356 (2006.01); F04C 29/00 (2006.01)
CPC F04C 29/068 (2013.01) [F04C 18/356 (2013.01); F04C 29/0085 (2013.01); F04C 2210/26 (2013.01); F04C 2230/60 (2013.01); F04C 2240/40 (2013.01); F04C 2270/12 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A rotary compressor, comprising:
a motor having a stator and a rotor electromagnetically coupled to one another;
a pump physically coupled to the rotor of the motor, wherein the pump is configured to draw in fluid through a suction line to an internal space within the pump and to compress and discharge the fluid through a discharge line;
a casing surrounding the motor and the pump;
a stator holder coupled to the stator of the motor and the pump, wherein the stator holder is spaced from the casing so as to provide physical separation between the stator and the casing such that the stator and stator holder are not directly coupled to the casing, and wherein the stator holder is constructed and arranged to provide sharp impedance mismatches at interfaces between the stator holder and the stator so as to reduce acoustic and vibrational energy transfer between the stator and the pump, wherein the stator holder includes a first portion surrounding an exterior surface of the stator and defining a space that receives the stator, wherein the stator holder includes a second portion partially enclosing an entrance into the space, wherein the first portion is positioned between the exterior surface of the stator and the casing;
a pressure separation member attached to the casing and located between the motor and the pump to create two spaces operable at different pressures within the casing;
a pump holder coupled to the pump, wherein the pump holder is separately formed from the pressure separation member and coupled to the pressure separation member, wherein the pump holder is physically separated from the casing, and wherein the pump holder is constructed and arranged to reduce acoustic and vibrational energy transfer between the pump and the casing, and wherein the pump holder is coupled to the casing only via the pressure separation member;
a suction pressure space that houses the motor and is fed by the suction line attached to a suction pressure side of the casing; and
a discharge pressure space that houses the pump and through which high pressure gas is discharged into a discharge line attached to the discharge side of the casing,
wherein the stator and the stator holder are not in direct contact with the casing such that an indirect transmission pathway for vibrational energy transfer is formed from the stator to the casing.