Lubricant pump system for hvac&r system

A lubricant pump system, comprising:

• a chamber configured to fluidly couple to a heat exchanger and configured to receive lubricant and/or a mixture of lubricant and working fluid from the heat exchanger;
• a pump configured to fluidly couple to the chamber via a conduit and configured to operate to remove the lubricant and/or the mixture of lubricant and working fluid from the heat exchanger, where the pump comprises:
• a plunger and a piston pipe coupled to one another and configured to translate within an outer conduit of the pump in a first direction and in a second direction to direct the lubricant and/or the mixture of lubricant and working fluid from an inlet of the pump to an outlet of the pump;
• a first solenoid configured to bias the plunger and the piston pipe in the first direction;
• a second solenoid configured to bias the plunger and the piston pipe in the second direction;
• and
• a plurality of valves configured to transition between respective open positions and respective closed positions in response to translation of the plunger and the piston pipe in the first direction and the second direction;
• and
• a controller communicatively coupled to the first solenoid and the second solenoid, wherein the controller is configured to:
• activate the first solenoid to bias the plunger and the piston pipe in the first direction;
• and
• activate the second solenoid to bias the plunger and the piston pipe in the second direction.

A heating, ventilation, air conditioning, and refrigeration (HVAC&R) system, comprising:

• a vapor compression circuit configured to circulate a working fluid therethrough, wherein the vapor compression circuit comprises:
• a compressor configured to circulate the working fluid;
• and
• a heat exchanger configured to place the working fluid in a heat exchange relationship with an additional fluid;
• and
• a lubricant return system configured to remove lubricant from the heat exchanger and return the lubricant to the compressor, wherein the lubricant return system comprises:
• a reservoir fluidly coupled to the heat exchanger and configured to receive the lubricant from the heat exchanger;
• a pump fluidly coupled to the reservoir, wherein the pump comprises a first solenoid and a second solenoid, and the pump is configured to continuously alternate between a pump stroke and a reset stroke to direct the lubricant out of the heat exchanger;
• and
• a controller communicatively coupled to the pump and configured to alternate energization of the first solenoid and the second solenoid to transition the pump between the pump stroke and the reset stroke.