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| Number | Title | Issue Date |
| 7153109 | Variable capacity rotary compressor A variable capacity rotary compressor includes a hermetic casing, a housing installed in the hermetic casing to define therein first and second compression chambers having different capacities, and a compressing unit placed in the first and second compression chambe... | 12/26/2006 |
| 6886354 | Compressor protection from liquid hazards Two liquid levels are sensed in the oil sump of a compressor to determine if sufficient oil and excess refrigerant are present prior to starting the compressor and appropriate steps taken, if necessary. At start-up, and during operation, the presence or flow of liqu... | 05/03/2005 |
| 6682322 | Air-conditioner for use in an automobile In an electromotive compressor of an air-conditioner for use in an automobile, an interior space of a container of a compressor is divided into a space including a compression mechanism portion and an electric motor portion, and an oil storage space, wher... | 01/27/2004 |
| 6575708 | Compressor head with improved oil retention A head assembly for use in a compressor having a first compression chamber for compressing a fluid includes a manifold housing defining an intake port, an exhaust port and a control valve port and having an outer wall, a first inner wall and a second inne... | 06/10/2003 |
| 6431843 | Method of ensuring optimum viscosity to compressor bearing system A method of ensuring adequate oil thickness for the bearings in a sealed compressor includes the step of monitoring the viscosity of a lubricant for the bearings. If the monitored viscosity drops below a minimum, then some control is effected to reduce th... | 08/13/2002 |
| 6302654 | Compressor with control and protection system A compressor protection and control subsystem for a rotary compressor provides temperature pressure, mis-wiring and vibrational protection for the scroll machine. The vibrational protection comprises a vibration sensor which is integrated on the circuit b... | 10/16/2001 |
| 5871338 | Vacuum pump with a gas ballast device The invention pertains to a vacuum pump (1) with a closable line (63, 102) through which gas ballast can be fed into the pump chamber (8, 9); to eliminate the danger that a recipient hooked up to the vacuum pump may be charged with air in the event of a p... | 02/16/1999 |
| 5215444 | System for controlling oil viscosity and cleanliness A system for and a method of establishing and maintaining fluid at desired cleanliness, viscosity and temperature levels in a flow system. The system includes a driven pump that circulates fluid from a fluid source through a hydraulic loading system that ... | 06/01/1993 |
| 4889471 | Mechanism for prevention of burning of bearing portions in a hermetic type scroll compressor In a scroll compressor, an open end of an oil extraction pipe which is placed in oil stored in a bottom portion of a hermetic casing is positioned at a location higher than an open end of an oil suction pipe that opens in the same stored oil, and a thermo... | 12/26/1989 |
| 4844702 | Lubrication circuit of rotary vacuum pumps A lubrication circuit connected to rotary vacuum pumps is composed of a hydraulic circuit and of the relative pump unit for lubrication and for auxiliary controls, including isolation of the negative pressure space from the pump on the stopping of the lat... | 07/04/1989 |
| 4605357 | Lubrication system for a compressor The invention comprises supplanting the usual, single, electrically-operated, blowdown valve, located on the receiver/separator tank of a gas compressor system with a pair of valves operatively arranged in parallel. The one valve operates normally in the ... | 08/12/1986 |
| 4525129 | Oil-sealed vacuum pump An oil-sealed vacuum pump comprises an oil circuit for supplying a pump chamber and bearings of the vacuum pump with oil. The oil circuit includes first and second branch conduits leading to the bearings and the pump chamber, respectively. The vacuum pump... | 06/25/1985 |
| 4483667 | Vacuum pump and method of operating the same A vacuum pump comprises a suction nipple valve including a cylinder, a piston slidably received therein and a movable valve closing member operatively connected to the piston. The vacuum pump further has a pressure medium conduit having a first end commun... | 11/20/1984 |
| 4441863 | Variable discharge rotary compressor A variable discharge rotary compressor has a housing, a rotor disposed therein and vanes mounted on the rotor to cooperate with the housing and the rotor to define variable volume working chambers disposed close to and separated from an intake chamber by ... | 04/10/1984 |
| 4406588 | Compressor suction regulator A suction regulator for a compressor, in particular a screw compressor with oil injection, having an element which opens and closes the suction inlet to the compressor. The element closes the inlet due to the bias of a spring, opens the inlet against the ... | 09/27/1983 |
| 4399663 | Mechanical control system for preventing compressor lubrication pump cavitation in a refrigeration system A control system for operating a vapor compression refrigeration system to prevent oil pump cavitation during startup of the refrigeration system is disclosed. The control system includes a differential pressure switch which is connected on one side to a ... | 08/23/1983 |
| 4229146 | Air compressors An air compressor assembly is provided having a high pressure air receiver, a compressor, an outlet port and an inlet port on said compressor, said inlet port having a normally closed spring loaded inlet valve, the improvement comprising a two position no... | 10/21/1980 |
