High performance compressors and vapor compression systems

A compressor comprising:

• at least one pressure containment shell;
• a motor and a motor heat exchanger, wherein the motor and the motor heat exchanger are positioned in a pressure containment shell of the at least one pressure containment shell;
• a pump body positioned in a pressure shell of the at least one pressure containment shell;
• wherein the pump body includes a pump operatively coupled to the motor;
• wherein the motor heat exchanger is configured to accept refrigerant diverted from a condenser or a high pressure heat exchanger of a refrigeration system, whereby the motor heat exchanger is configured to cool the motor, to decrease operating temperature of the motor, and to increase electrical efficiency of the motor;
• a compression chamber within the pump body;
• and
• at least one supercharging port or valve provided in the pump body leading into the compression chamber configured to receive the diverted refrigerant, after cooling the motor, such that the diverted refrigerant is injected back into the compression chamber through the at least one supercharging port or valve during a compression process of the pump, and, at an end of the compression process, is discharged to the condenser together with an original refrigerant output of the pump without the supercharging, such that a recirculating loop for the diverted refrigerant is created between the compressor and the condenser or the high pressure heat exchanger.

A refrigeration system comprising:

• a condenser configured to condense a refrigerant from a compressed gas or vapor phase to a liquid phase, or a high pressure heat exchanger to cool compressed trans-critical fluid refrigerant;
• at least one expansion device configured to receive condensed refrigerant from the condenser or cooled high pressure trans-critical fluid refrigerant and expand the refrigerant to a lower pressure, liquid or mostly liquid phase of the refrigerant;
• an evaporator configured to receive the refrigerant from the at least one expansion device and evaporate the refrigerant from the liquid or mostly liquid phase to gas or vapor phase;
• and
• a compressor comprising:
• at least one pressure containment shell;
• a motor and a motor heat exchanger, wherein the motor and the motor heat exchanger are positioned in a pressure containment shell of the at least one pressure containment shell;
• a pump body positioned within a pressure containment shell of the at least one pressure containment shell;
• wherein the pump body includes a pump operatively coupled to the motor;
• wherein the motor heat exchanger is configured to accept refrigerant diverted from the condenser or the high pressure heat exchanger, wherein the motor heat exchanger is configured to cool the motor, to decrease operating temperature of the motor, and to increase electrical efficiency of the motor;
• a compression chamber within the pump body;
• and
• at least one supercharging port or valve provided in the pump body leading into the compression chamber, wherein the diverted refrigerant, after cooling the motor, is injected back into the compression chamber through the at least one supercharging port or valve during a portion of a compression process of the pump, and, at an end of the compression process, is discharged to the condenser together with an original refrigerant output of the pump without the supercharging, such that a recirculating loop for the diverted refrigerant is created between the compressor and the condenser or the high pressure heat exchanger.