A heating, ventilation, air conditioning, and/or refrigeration (HVAC&R) system includes a refrigerant circuit configured to flow a refrigerant therethrough, a sump configured to direct a lubricant to a compressor, an ejector configured to direct the lubricant from the refrigerant circuit to the sump, and an expansion device configured to reduce a pressure of the refrigerant directed through the refrigerant circuit. The HVAC&R system further includes a controller configured to instruct the expansion device to adjust to a first position to enable the ejector to direct lubricant from the refrigerant circuit to the sump at a first target flow rate in a first mode, and the controller is configured to instruct the expansion device to adjust to a second position to enable the ejector to direct lubricant from the refrigerant circuit to the sump at a second target flow rate in a second mode.

An apparatus includes a high side heat exchanger, a flash tank, a first load, a first oil separator, and a first compressor. The high side heat exchanger removes heat from a refrigerant. The flash tank stores the refrigerant. The first load uses the refrigerant to cool a first space proximate the first load. During a first mode of operation, the first oil separator separates an oil from the refrigerant from the first load and directs the refrigerant to an ejector. The ejector directs the refrigerant from the high side heat exchanger and the refrigerant form the first oil separator to the flash tank. The flash tank directs the refrigerant from the first oil separator to the first compressor. The first compressor compresses the refrigerant from the flash tank. During a second mode of operation, the first oil separator directs the oil separated from the refrigerant to the first compressor.

An eductor system for a chiller assembly is provided. The system includes a first and a second eductor. The first eductor includes a first suction inlet that receives a first oil and refrigerant mixture from a plenum of a compressor, a first motive inlet that receives a first motive fluid from an oil sump, and a first outlet that discharges a first outlet mixture to the oil sump. The first outlet mixture includes both the first oil and refrigerant mixture and the first motive fluid. The second eductor includes a second suction inlet that receives a second oil and refrigerant mixture from an evaporator, a second motive inlet that receives a second motive fluid from a condenser, and a second outlet that discharges a second outlet mixture to the plenum of the compressor. The second outlet mixture includes both the second oil and refrigerant mixture and the second motive fluid.

A heat exchange system and a method for reclaiming corrosion inhibitor in a heat exchange system are provided by the present disclosure. The heat exchange system includes a compressor (1), a condenser (2) and an evaporator (3) connected in sequence, and the heat exchange system further includes a system for reclaiming corrosion inhibitor which includes an ejector (6) including a high-pressure fluid inlet (61) connected to an outlet (11) of the compressor, a suction fluid inlet (62) connected to the heat exchange system to extract a liquid-state refrigerant in the heat exchange system, and a fluid outlet (63) leading to bearings of the compressor, wherein a pressurizing device (5) is provided between the outlet of the compressor and the high-pressure fluid inlet of the ejector. The heat exchange system according to the embodiments of the present disclosure can provide sufficient corrosion inhibitor to the bearings of the compressor under various working conditions.

A refrigeration system includes a compressor for compressing a refrigerant, a condenser for cooling the refrigerant, an evaporator for heating the refrigerant, and a lubrication system for providing a lubricant mist to a movable component of the compressor. The lubrication system includes an ejector arranged in fluid communication with the compressor and the evaporator, wherein the lubricant mist is carried by the refrigerant to the movable component.

A speed governor assembly and an elevator system. The speed governor assembly includes: a sheave; a centrifugal mechanism mounted on the sheave and rotating together with the sheave; an overspeed protection switch at a first distance from a radial outer side of the centrifugal mechanism; a core ring disposed coaxially with the sheave; and a triggering arm rotating together with the core ring; wherein the centrifugal mechanism engages with the core ring and drives the core ring and the triggering arm to rotate when the sheave reaches a second speed, and the rotation of the triggering arm can contact and trigger the overspeed protection switch.

An eductor system for a chiller assembly is provided. The system includes a first and a second eductor. The first eductor includes a first suction inlet that receives a first oil and refrigerant mixture from a plenum of a compressor, a first motive inlet that receives a first motive fluid from an oil sump, and a first outlet that discharges a first outlet mixture to the oil sump. The first outlet mixture includes both the first oil and refrigerant mixture and the first motive fluid. The second eductor includes a second suction inlet that receives a second oil and refrigerant mixture from an evaporator, a second motive inlet that receives a second motive fluid from a condenser, and a second outlet that discharges a second outlet mixture to the plenum of the compressor. The second outlet mixture includes both the second oil and refrigerant mixture and the second motive fluid.

A centrifugal heat pump system includes a steam system with a steam supply, a steam turbine and a steam condenser connected in a steam loop; and a refrigerant system including a first compressor and a second compressor, a refrigerant condenser, and an evaporator connected in a refrigerant loop. The steam turbine includes a rotary drive shaft disposed axially and extending from a first end and a second end of the steam turbine. A sump system collects and redistributes oil or other lubricating fluid. The first compressor is coupled by a first coupling device to the first end of the steam turbine drive shaft and the second compressor is coupled by a second coupling device to the second end of the steam turbine drive shaft. The first and second compressors are connected in parallel in the refrigerant loop and controlled to share a cooling load equally.

An apparatus includes a high side heat exchanger, a flash tank, a first load, a first oil separator, and a first compressor. The high side heat exchanger removes heat from a refrigerant. The flash tank stores the refrigerant. The first load uses the refrigerant to cool a first space proximate the first load. During a first mode of operation, the first oil separator separates an oil from the refrigerant from the first load and directs the refrigerant to an ejector. The ejector directs the refrigerant from the high side heat exchanger and the refrigerant form the first oil separator to the flash tank. The flash tank directs the refrigerant from the first oil separator to the first compressor. The first compressor compresses the refrigerant from the flash tank. During a second mode of operation, the first oil separator directs the oil separated from the refrigerant to the first compressor.

A heat exchange system and a method for reclaiming corrosion inhibitor in a heat exchange system are provided by the present disclosure. The heat exchange system includes a compressor (1), a condenser (2) and an evaporator (3) connected in sequence, and the heat exchange system further includes a system for reclaiming corrosion inhibitor which includes an ejector (6) including a high-pressure fluid inlet (61) connected to an outlet (11) of the compressor, a suction fluid inlet (62) connected to the heat exchange system to extract a liquid-state refrigerant in the heat exchange system, and a fluid outlet (63) leading to bearings of the compressor, wherein a pressurizing device (5) is provided between the outlet of the compressor and the high-pressure fluid inlet of the ejector. The heat exchange system according to the embodiments of the present disclosure can provide sufficient corrosion inhibitor to the bearings of the compressor under various working conditions.