Abstract: The orientation of the elements of a slider block radial compliance mechanism for a scroll compressor is such that the point of application of the actuating force is shifted from a first line extending through the center of gravity of the counterweight and the axis of the crankshaft to a second line parallel to said first line and extending through the axis of the orbiting scroll. The result of the changed orientation is an increase in the magnitude of both the sealing force between the scroll elements and the actuating force to move the mechanism.

Abstract: The temperature is sensed at the compressor, indoor coil and outdoors. The sensed temperatures are compared and if the compressor temperature is not a specified amount higher than the lower of the other two sensed temperatures, then the crankcase heater is energized. When the compressor temperature rises to or is a specified amount above the lower of the other two temperatures, the crankcase heater is deenergized.

Abstract: A slider block radial compliance mechanism includes a slider block and a bearing seat which form a subassembly and are located in a circular counterbore in the crankshaft. The slider block has a bore which receives the boss of an orbiting scroll. The orbiting scroll and its boss are held to an orbiting motion while the slider block, bearing seat and crankshaft rotates as a unit with respect to the boss.

Abstract: A closed refrigeration system is provided with a mass flow limiting device located upstream of the suction inlet of a compressor. The device limits the mass flow supplied to the compressor during pulldown and startup to prevent overloading the motor or engine driving the compressor but has minimal influence on the refrigeration system under equilibrium conditions since it is designed for the specific system parameters.

Abstract: In a low side hermetic compressor, a small portion of the compressed refrigerant gas is diverted and discharged into the oil sump through an orifice into the upper level of the oil in the sump. This results in a supersaturated solution of refrigerant in oil in the upper level which drives the refrigerant out of the oil, thereby creating froth which provides sound reduction without disturbing the lower level which remains stratified.

Abstract: The center of gravity of the rotor of a rolling rotor motor and the center of gravity of the orbiting scroll(s) of a scroll compressor are located on diametrically opposite sides of the centerline of the stator. The rotor and orbiting scroll(s) are connected through a plurality of circumferentially spaced links which are pivotable about fixed axes whereby movement of the rotor produces movement of the orbiting scroll(s) while the orbiting scroll(s) serves as a counterweight with respect to the rotor.

Abstract: Two annular pressure pockets are used to push the orbiting scroll against the fixed scroll to minimize leakage. One pocket is at intermediate pressure and the other is at discharge pressure. The pockets are defined by the orbiting scroll and an axial ring carried by the orbiting scroll which permits the use of radial seals thereby essentially eliminating wear on the seals.

Abstract: Two annular pressure pockets are used to push the orbiting scroll against the fixed scroll to minimize leakage. One pocket is at intermediate pressure and the other is at discharge pressure. The pockets are defined by the orbiting scroll and an axial ring. In the preferred embodiment inner and outer seals are carried by the axial ring and an intermediate seal is carried by the orbiting scroll whereby the pressure pockets are of an eccentric configuration.

Abstract: The center of gravity of the rotor of a rolling rotor motor and the center of gravity of the counterweights are located on diametrically opposite sides of the centerline of the stator. The rotor and counterweights are connected through a plurality of circumferentially spaced links which are pivotable about fixed axes. The rotor and counterweights are able to move radially to change their rotation arm but such movement is transmitted to the other member through the links resulting in a corresponding movement.

Abstract: The failure of compressors due to their most common causes of failure are avoided by monitoring the operation of a compressor and operating or locking off the compressor where appropriate. Specifically, the system in run after a predetermined number of pump-downs without a call for cooling and the compressor is locked off if it cycles a predetermined number of times within a preset time period or if a low pressure situation is sensed during a call for cooling.

Abstract: A suction strainer for use with a fluid machine in the form of a tee-shaped housing with a crossover bore, an upright branch, a seal and a frustoconical mesh strainer is provided in which the mesh portion is spaced from the outlet of the housing so as to provide a large area of the mesh portion with the same pressure drop. Additionally, the entrance to the outlet branch is provided with a generous radius for a smoother flow transition.

Abstract: The motion of the orbiting scroll is used to cause pumping of oil in a hermetic horizontal scroll compressor.

Abstract: A suction strainer is provided in which the mesh portion is spaced from the outlet so as to provide a large area of the mesh portion with the same pressure drop. Additionally, the entrance to the outlet branch is provided with a generous radius for a smoother flow transition.

Abstract: A hermetic scroll compressor is driven by a rolling rotor motor. The orbiting scroll and drive shaft are integral and orbit with respect to the rotor which carries the drive shaft as it moves about the stator bore.

Abstract: An economizer is connected to a fluid line connecting the first and second stages of a compressor at a point downstream of the bypass for unloading the first stage. The economizer flow controls the discharge temperature of the second stage and, in addition, coacts with the bypassing of the first stage such that all of the flow supplied to the second stage is at system suction pressure when the bypass is fully open.

Abstract: Axial compliancy is achieved in a scroll compressor by providing a fluid pressure bias to the back of the orbiting scroll. The fluid pressure bias is supplied by one or more pockets configured to combine the efficient use of the available area with ease of manufacture.

Abstract: In a compressor having a plurality of banks of cylinders, smaller steps of unloading are achieved by unloading a single cylinder in a bank. When only one cylinder is to be unloaded, gas bypass is used in order to maintain a closer balance of forces in the bank. When the entire bank is unloaded, it is preferably done via the suction cutoff method.

Abstract: In a preferred embodiment, refrigerant together with oil, water and any other contaminants is drawn off from a high pressure refrigeration system. The drawn off refrigerant is reduced in pressure and serially, the oil is removed, the water is removed and the amount of water and acid present is determined.

Abstract: To prevent defrost melt from refreezing during a defrost cycle, the hot gas bypass line is branched to heat the metal plate across which the defrost melt flows as well as the drain pan.

Abstract: A hermetic horizontal scroll compressor uses the motion of the Oldham coupling to pump oil from the sump to a lubrication distribution system for the scroll compressor.