| Patent Number |
Title Of Patent |
Date Issued |
| 7553142 |
Lubrication system for compressor |
June 30, 2009 |
| 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 ori |
| 6814540 |
Rotating vane diffuser for a centrifugal compressor |
November 9, 2004 |
| A vaned diffuser for a centrifugal compressor has provision for selectively adjusting the pitch of the vanes in order to accommodate variable load conditions. Each of the vanes is rotatable about a pivot pin near its leading edge and is engaged with an actuation member near its trailing |
| 6547520 |
Rotating vane diffuser for a centrifugal compressor |
April 15, 2003 |
| A vaned diffuser for a centrifugal compressor has provision for selectively adjusting the pitch of the vanes in order to accommodate variable load conditions. Each of the vanes is rotatable about a pivot pin near its leading edge and is engaged with an actuation member near its trailing |
| 5927720 |
Two-piece labyrinth seal for a centrifugal compressor balance piston |
July 27, 1999 |
| In order to accommodate a labyrinth seal whose diameter is too large to form a gas passage using conventional techniques, the labyrinth seal is made in two parts. A first part is an inner ring whose outer diameter is sufficiently small so as to permit the forming of a passage therein wit |
| 5899661 |
Axial restraint system for variable pipe diffuser |
May 4, 1999 |
| An axial restraint system for use in a variable pipe diffuser having an inner ring rotatably positioned within an outer ring. The axial restraint system includes a housing fixedly mounted to the outer ring and having a mounting hole disposed therein in perpendicular arrangement to the in |
| 5404964 |
System for reducing oil migration from a transmission |
April 11, 1995 |
| A gear shroud is provided in close surrounding relationship to the drive gear of a centrifugal compressor such that the turbulence within the surrounding gear housing is substantially reduced and the resulting high speed flow of refrigerant is instead directed into an adjacent oil sump. |
| 5301771 |
Oil channeling in a centrifugal compressor transmission |
April 12, 1994 |
| In the transmission of a centrifugal compressor, where a gear is located adjacent to a lubricated bearing, a barrier is provided between the bearing and the gear to restrain the flow of oil to the gear and thereby reduce the pumping and windage losses that would otherwise occur. An oil |
| 5267452 |
Back pressure valve |
December 7, 1993 |
| A shaft-mounted piston is reciprocally disposed on the axis of a valve inlet opening such that increased pressure from within the motor casing of a centrifugal compressor causes the piston to move in the direction of the refrigerant flow, against a biasing means, to increase the flow of |
| 5209080 |
Refrigerant flow control device |
May 11, 1993 |
| A cylindrical standpipe extends upwardly from the bottom of a liquid refrigerant sump, and vertical slots are formed in the sides thereof near the bottom end. On the inner sides of the standpipe, a sleeve is slideably disposed to uncover the slots as the sleeve is vertically raised. On t |
| 5173020 |
Collector silencer for a centrifugal compressor |
December 22, 1992 |
| A centrifugal compressor is provided with a collector for receiving refrigerant from the diffuser, and sound absorbent segments are placed within the collector and retained in place against one wall thereof. One method of retention is by way of a ring and a plurality of spring clip m |
| 5009079 |
Refrigerant flow control device |
April 23, 1991 |
| A simple flow control device is provided in a condensate drain pipe to prevent the flow of refrigerant vapor therethrough and to regulate the flow of liquid refrigerant as a function of the level of accumulated liquid refrigerant in the drain pipe. The only moving part is a float dev |
| 4997340 |
Balance piston and seal arrangement |
March 5, 1991 |
| A labyrinth seal is provided to isolate the transmission from a balance piston of a centrifugal compressor, the labyrinth seal being pressurized with refrigerant vapor from the motor chamber, which vapor is at a pressure slightly above that in the transmission, to thereby minimize the |
| 4938664 |
Oil reclaim system |
July 3, 1990 |
| In a centrifugal compressor having an ejector for reclaiming the oil which tends to accumulate in a lower portion of the suction housing, the ejector high pressure line is provided with its inlet at the bottom of the collector such that, in addition to providing the high pressure power t |
| 4789317 |
Rotary vane oil pump and method of operating |
December 6, 1988 |
| A rotary vane pump has restricted fluid communication between the inlet and the trapped volume for about 4.degree. of rotation beyond when the vane starts past the inlet. Similarly there is restricted communication between the trapped volume and the outlet for about 4.degree. of rotation |
| 4611969 |
Calibrating apparatus and method for a movable diffuser wall in a centrifugal compressor |
September 16, 1986 |
| An apparatus and method is provided for initializing and calibrating a microprocessor controlled refrigeration system including a centrifugal compressor having a variable width diffuser section. |
| 4589060 |
Microcomputer system for controlling the capacity of a refrigeration system |
May 13, 1986 |
| A microcomputer system and method for controlling the capacity of a refrigeration system are disclosed. The microcomputer system receives electrical input signals indicative of operator selected settings and refrigeration system operating parameters. The microcomputer system processe |
| 4539820 |
Protective capacity control system for a refrigeration system |
September 10, 1985 |
| A protective capacity control system and method for controlling the capacity of a refrigeration system are disclosed. The protective capacity control system receives electrical input signals indicative of operator selected settings and refrigeration system operating parameters. These |
| 4531375 |
Purge system monitor for a refrigeration system |
July 30, 1985 |
| A refrigeration system is disclosed having a purge system with means for monitoring operation of the purge system and for taking corrective action in response to excessive purge system operation. Preferably, the monitoring means is a microcomputer control system for monitoring purge |
| 4514991 |
Variable speed drive motor system with inverter control |
May 7, 1985 |
| A variable speed drive motor system is disclosed. The motor system is particularly suitable for use as a drive system for a centrifugal compressor in a refrigeration system. The motor system includes an AC auxiliary motor/generator with inverter control. The motor/generator is interc |
| 4404812 |
Method and apparatus for controlling the operation of a centrifugal compressor in a refrigeratio |
September 20, 1983 |
| A method and apparatus to prevent oil pump cavitation in a hermetically sealed vapor compression refrigeration system are disclosed. A hermetically sealed housing containing the refrigeration compressor transmission and oil supply reservoir is connected to the suction side of the com |
| 4309876 |
Method and apparatus for satisfying heating and cooling demands and control therefor |
January 12, 1982 |
| Apparatus for satisfying heating and cooling demands including a cooling circuit having a high pressure side and a low pressure side, and a heating circuit including a booster compressor for drawing and compressing refrigerant from the high pressure side of the cooling circuit. Also |
| 4267705 |
Refrigeration purging system |
May 19, 1981 |
| A purge system for use in a refrigeration system utilizing more than one condenser, each of which operates at different pressures. The purge system includes a purge chamber having a cooling coil connected to the evaporator and adapted to condense refrigerant vapor. The purge chamber is c |
