REFRIGERANT COOLING AND LUBRICATION SYSTEM WITH REFRIGERANT VAPOR VENT LINE

摘要

Generally, apparatuses, systems, and methods are described to vent refrigerant vapor from the refrigerant pump line using a vent line, such as during priming of the pump and/or during a startup of the compressor, directed to a relatively reduced volute casing mass of the refrigerant pump, and/or directed to returning refrigerant to an economizer or chiller component other than the condenser.

主权项

1. A heating, ventilation, air conditioning (HVAC) unit for an HVAC system comprising:
a compressor having a motor and a drive; a condenser fluidly connected to the compressor; an evaporator fluidly connected to the condenser; a unit controller; and a refrigerant cooling and lubrication assembly that comprises:
a condenser source line fluidly connected to the condenser, the condenser source line having a flow control device,an evaporator source line fluidly connected to the evaporator, the evaporator source line having a flow control device,a refrigerant pump line fluidly connected to the condenser source line and fluidly connected to the evaporator source line, the condenser source line and the evaporator source line feed into the refrigerant pump line, the refrigerant pump line is fluidly connected to at least one of the motor and the drive of the compressor,a refrigerant pump located on the refrigerant pump line, the refrigerant pump having an inlet and an outlet fluidly connected with the refrigerant pump line, the refrigerant pump having a housing and a volute casing, the volute casing is configured with a mass suitable to reduce the amount of refrigerant vapor present in the refrigerant pump line, the volute casing having tabs configured to provide structural connection locations for the volute casing to be connected to the refrigerant pump housing, the volute casing having a portion with a relatively smaller circumference than a portion on which the tabs are disposed, and the outlet of the refrigerant pump being disposed on the portion on which the tabs are disposed and not on the portion with the relatively smaller circumference, and the volute casing being a casted part.