Compact low noise rotary compressor

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 connected to a discharge port of the pump;
• 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;
• and
• a pump holder coupled to the pump and a side wall of the casing, wherein the pump holder is configured to provide physical separation between the pump and the casing;
• and
• a rotary seal type suction connection inside the casing that includes an outer support and an inner support, wherein:
• the inner support is positioned within an inner space of the outer support;
• the inner support has a flange extending around a body of the inner support for holding the body of the inner support in place when positioned within the inner space of the outer support, wherein the flange is attached via a direct connection to the pump;
• the inner support is attached to the pump to form part of the pump;
• the inner support is equipped with a suction pathway into the pump from the outer support;
• the outer support is attached directly or indirectly to the casing and equipped with a stationary suction connection to the suction line;
• the inner support is rotatable relative to the outer support;
• and
• the inner support and the outer support provide the suction pathway for a suction gas from the suction line into the casing by maintaining a rotary seal formed by a gap and lubricating oil between contacting surfaces of the inner support and the outer support, such that the suction line is connected to an interior of the casing without a direct suction line connection to the pump.

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 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;
• wherein the pump holder includes a first portion at least partially surrounding the pump, wherein the first portion is positioned between an exterior surface of the pump and the casing and defines a space which receives the pump, wherein the pump holder includes a second portion at least partially enclosing the space defined by the first portion;
• 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.