Abstract: A compressor assembly includes a housing assembly and a first rotor and second rotor arranged within the housing assembly. The first rotor is supported for rotation by a first inlet bearing adjacent an inlet end of the housing assembly and by a first discharge bearing adjacent a discharge end of the housing assembly. The second rotor is supported for rotation by a second inlet bearing adjacent the inlet end of the housing assembly and by a second discharge bearing adjacent the discharge end of the housing assembly. A first lubricant flow path supplies lubricant to at least two of the first discharge bearing, the first inlet bearing, the second discharge bearing, and the second inlet bearing sequentially.

Abstract: A compressor assembly is provided including an inlet bearing and an outlet bearing. A rotating compressor member is support for rotation on an inlet end by the inlet bearing and on an outlet end by the outlet bearing. A plurality of connecting passages is configured to supply lubricant to the inlet bearing and the outlet bearing. A first lubricant flow path is arranged downstream from a pressure reducing orifice. The first lubricant flow path is fluidly coupled to at least one of the plurality of connecting passages. At least a portion of the first lubricant flow path is arranged in a heat exchange relationship with a hot gas in discharge port such that the lubricant within the first lubricant flow path increases in viscosity.

Abstract: A compressor assembly is provided including an inlet bearing and an outlet bearing. A rotating compressor member is support for rotation on an inlet end by the inlet bearing and on an outlet end by the outlet bearing. A plurality of connecting passages is configured to supply lubricant to the inlet bearing and the outlet bearing. A first lubricant flow path is arranged downstream from a pressure reducing orifice. The first lubricant flow path is fluidly coupled to at least one of the plurality of connecting passages. At least a portion of the first lubricant flow path is arranged in a heat exchange relationship with a hot gas in discharge port such that the lubricant within the first lubricant flow path increases in viscosity.

Abstract: A compressor assembly is provided including a housing assembly. A first rotor and a second rotor are arranged within the housing assembly. The first rotor is supported for rotation by a first inlet bearing adjacent an inlet end of the housing assembly and by a first discharge bearing adjacent a discharge end of the housing assembly. The second rotor is supported for rotation by a second inlet bearing adjacent the inlet end of the housing assembly and by a second discharge bearing adjacent the discharge end of the housing assembly. A first lubricant flow path is configured to supply lubricant to more than one of the first discharge bearing, the first inlet bearing, the second discharge bearing, and the second inlet bearing generally sequentially.

Abstract: A vapor compression system (10), also known as a chiller, includes a refrigeration loop and a lubrication loop. The lubrication loop includes a lubrication reclamation system that further includes a still (42) and an ejector (44) to reduce a pressure in the still (42). The ejector (44) includes an input portion (46), an output portion 54 and a vent portion (50). The input portion (46), the output portion (54) and the vent portion (50) are in fluid communication with one another. The vent portion (50) of the ejector (44) is positioned in a vent line (48) associated with the still (42). The still (42) primarily contains a mixture of liquid refrigerant and lubricant. The input portion (46) of the ejector receives liquid or gas at a high pressure and expels the liquid or gas through the output portion (54) at an intermediate pressure. As the input fluid at a high pressure flows through the ejector (44), a low pressure is created at the vent portion (50).

Abstract: A compressor includes a slide valve (24) having a passage that can be in fluid communication with a discharge plenum (22) and a suction plenum (20). The slide valve (24) position may be axially adjusted to control an amount of refrigerant that is compressed between a male rotor (14) and a female rotor (12) in the compressor based upon a system control scheme that determines capacity demand. The passage (28) is in fluid communication with the discharge plenum (22) and the suction plenum (20) when the slide valve is in a fully unloaded position or a partially unloaded position. A compressor housing blocks an opening to the passage when the slide valve (24) is in a fully loaded position. The location of the opening (36) in the slide valve determines what point in axial travel of the slide valve that fluid bypass begins.

Abstract: A compressor apparatus (20) has a housing (22) having first (53) and second (58) ports along a flowpath. One or more working elements (26; 28) cooperate with the housing (22) to define a compression path between suction (60) and discharge (62) locations along the flowpath. A check valve (70; 170; 270) has a valve element (72; 172; 272) mounted for movement between a first condition permitting downstream flow along the flowpath and a second condition blocking a reverse flow. The valve element includes a resonator (112; 174; 274).

Abstract: A valve for varying volume ratio in a screw compressor to balance a compression pocket pressure and a discharge pressure in the screw compressor comprises a valve body and a reed valve. The valve body defines a duct and an auxiliary port. The duct includes an open end in communication with a discharge chamber of the compressor and thereby the discharge pressure. The auxiliary port extends from a rotor bore of the compressor to the duct and provides fluid communication therebetween for communicating the compression pocket pressure to the duct. The reed valve is disposed within the duct for regulating fluid flow between the compression pocket and the duct. The reed valve is operable via a pressure differential between the compression pocket pressure and the discharge pressure.

Abstract: A compressor (20) has an unloading slide valve (100). The valve has a valve element (102) having a range between a first condition and a second condition, the second condition being unloaded relative to the first condition. A piston (124) is in a cylinder (128) and mechanically coupled to the valve element. A control valve (40; 42) is coupled to a headspace (138) of the cylinder to selectively expose the headspace to a fluid source (144), pressure of fluid in the headspace producing a force on the piston and valve element in a direction from the second condition toward the first condition. The compressor includes means (190, 192; 210; 220) for relieving excess pressure in the headspace.

Abstract: A compressor apparatus (20) has a housing (22) having first (53) and second (58) ports along a flow path. One or more working elements (26; 28) cooperate with the housing (22) to define a compression path between suction (60) and discharge (62) locations along the flow path. An unloading valve (100) has a valve element (102) having a range between a first condition and a second condition, the second condition being unloaded relative to the first condition. Means (120, 160) bias the valve element toward a third condition intermediate the first and second conditions.

Abstract: A compressor includes a slide valve (24) having a passage that can be in fluid communication with a discharge plenum (22) and a suction plenum (20). The slide valve (24) position may be axially adjusted to control an amount of refrigerant that is compressed between a male rotor (14) and a female rotor (12) in the compressor based upon a system control scheme that determines capacity demand. The passage (28) is in fluid communication with the discharge plenum (22) and the suction plenum (20) when the slide valve is in a fully unloaded position or a partially unloaded position. A compressor housing blocks an opening to the passage when the slide valve (24) is in a fully loaded position. The location of the opening (36) in the slide valve determines what point in axial travel of the slide valve that fluid bypass begins.

Abstract: A compressor (20) has an unloading slide valve (100). The valve has a valve element (102) having a range between a first condition and a second condition, the second condition being unloaded relative to the first condition. A first surface (200) of the valve element (102) is in sliding engagement with a second surface (202) of the housing (22) during movement between the first and second conditions. The compressor includes means for lubricating the first (200) and second (202) surfaces.

Abstract: A screw compressor (20) has a housing having first and second ports along a flow path. A male-lobed rotor has a first rotational axis. A female-lobed rotor has a second rotational axis and is enmeshed with the male-lobed rotor to define a compression path between suction and discharge locations along the flow path. The compressor has a compressor lubrication network having a lubricant outlet port (242) along a low pressure cusp (244). An unloading slide valve element (102) may be along a high pressure cusp (105).

Abstract: A compressor (20) has an unloading slide valve (100). The valve has a valve element (102) having a range between a first condition and a second condition, the second condition being unloaded relative to the first condition. A piston (124) is in a cylinder (128) and mechanically coupled to the valve element. A control valve (40; 42) is coupled to a headspace (138) of the cylinder to selectively expose the headspace to a fluid source (144), pressure of fluid in the headspace producing a force on the piston and valve element in a direction from the second condition toward the first condition. The compressor includes means (190, 192; 210; 220) for relieving excess pressure in the headspace.

Abstract: A compressor apparatus has a housing (22) having first (53) and second (58) ports along a flowpath. One or more working elements (26, 28) cooperate with the housing to define a compression path between suction and discharge locations along the flowpath. A check valve (70) has a valve element having a first condition permitting downstream flow along the flowpath and a second condition blocking a reverse flow. Sound suppressing means (120, 220, 320) at least partially surround the flowpath upstream of the valve element (70).

Abstract: A compressor of this invention includes a flow passage supplying lubricant to an outlet bearing and to an inlet bearing. An orifice is disposed within the flow passages for controlling lubricant flow to the bearing assemblies. A choke orifice is disposed in series with one of the orifices for either the inlet or outlet for controlling lubricant flow relative to the other orifice.

Abstract: A compressor apparatus (20) has a housing (22) having first (53) and second (58) ports along a flow path. One or more working elements (26; 28) cooperate with the housing (22) to define a compression path between suction (60) and discharge (62) locations along the flow path. An unloading valve (100) has a valve element (102) having a range between a first condition and a second condition, the second condition being unloaded relative to the first condition. Means (120, 160) bias the valve element toward a third condition intermediate the first and second conditions.

Abstract: A compressor apparatus having a check valve (70) having a first condition permitting downstream flow along the flowpath and a second condition blocking a reverse flow. The valve element includes a resonator (112).

Abstract: A vapor compression system (10), also known as a chiller, includes a refrigeration loop and a lubrication loop. The lubrication loop includes a lubrication reclamation system that further includes a still (42) and an ejector (44) to reduce a pressure in the still (42). The ejector (44) includes an input portion (46), an output portion 54 and a vent portion (50). The input portion (46), the output portion (54) and the vent portion (50) are in fluid communication with one another. The vent portion (50) of the ejector (44) is positioned in a vent line (48) associated with the still (42). The still (42) primarily contains a mixture of liquid refrigerant and lubricant. The input portion (46) of the ejector receives liquid or gas at a high pressure and expels the liquid or gas through the output portion (54) at an intermediate pressure. As the input fluid at a high pressure flows through the ejector (44), a low pressure is created at the vent portion (50).

Abstract: A screw compressor (20) has compressor lubrication network having a lubricant outlet port (242) along a low pressure cusp (244). An unloading slide valve element (102) may be along a high pressure cusp (105).