Abstract: A scroll-type machine is disclosed which is particularly well suited for use as a compressor in refrigeration and air conditioning systems and incorporates a unique arrangement for modulating the capacity thereof. In one group of embodiments the capacity of the scroll-type machine is modulated by relative axial movement between the scroll members so as to form a leakage path across the wrap tips and opposed end plates. In another group of embodiments, modulation is achieved by reducing the orbital radius of one of the scroll members to thereby form a leakage path across the flank surfaces of the wraps. In the second group, a plurality of pin members are moveable from a first and second positions. In a first position the plurality of pin members operably enable the scroll members to orbit and in a second position the pin members restrict the orbiting motion of the first scroll members.

Abstract: A control for a refrigeration system serviced by a special pulse width modulated compressor coupled to a condenser and evaporator. The system can be of the distributed type wherein the condenser and compressor may be coupled to service a group of adjacent refrigeration cases, wherein each case would have its own evaporator. A controller is coupled to a load sensor for producing a variable duty cycle control signal in which the duty cycle is a function of demand for cooling. Moreover, fuzzy logic techniques may be utilized in order to provide self adaptive tuning control for the system.

Abstract: A scroll type machine particularly suited for use as a refrigeration compressor is disclosed which includes a bearing assembly for non-adjustably rotatably supporting a drive shaft. The bearing assembly is in turn non-adjustably supported on the sidewall of an outer shell. The scroll type machine also includes an oil delivery system for delivering lubricating oil from a lower sump to an upper end of the crankshaft and an oil return hole in a fixed portion of the compressor for returning oil to the sump.

Abstract: There is disclosed a scroll-type machine particularly suited for use as a refrigerant compressor and incorporating a lubrication system for supplying lubricant from a sump to a thrust surface on which the orbiting scroll member is supported. The lubrication system utilizes passages provided in the driving crankshaft and the bearing housing which housing defines the thrust surface.

Abstract: A method of making a scroll-type machine particularly suited for use as a refrigerant compressor and incorporating an improved suspension system for the non-orbiting scroll whereby the latter may be pressure biased for the purpose of augmenting tip sealing. The machine also has a modified wrap tip and end plate profile in order to enhance performance, as well as an improved lubrication system for the drive and a baffle arrangement to provide a directed suction inlet. The machine also has an Oldham coupling utilizing a novel ring element which is non-circular and provides for increased thrust-bearing size, or reduced machine size.

Abstract: A scroll-type machine is disclosed which is particularly well suited for use as a compressor in refrigeration and air conditioning systems and incorporates a unique arrangement for modulating the capacity thereof. In one group of embodiments the capacity of the scroll-type machine is modulated by relative axial movement between the scroll members so as to form a leakage path across the wrap tips and opposed end plates. In another group of embodiments, modulation is achieved by reducing the orbital radius of one of the scroll members to thereby form a leakage path across the flank surfaces of the wraps. Both types of scroll separation may be accomplished in a time pulsed manner to thereby enable a full range of modulation with the duration of the loading and unloading periods being selected to maximize the efficiency of the overall system.

Abstract: The microprocessor-based HVAC control system detects sensor faults by comparing thermistor readings with predetermined extreme values, indicative of sensor fault. The system automatically selects the appropriate combination of automatic/preset modes of operating key system components such as the expansion valve, the demand defrost system and the indoor fan speed control system. With a view towards minimizing any negative impact on system performance and reliability in the event of sensor malfunction.

Abstract: A scroll-type machine is disclosed which is particularly well suited for use as a compressor in refrigeration and air conditioning systems and incorporates a unique arrangement for modulating the capacity thereof. In one group of embodiments the capacity of the scroll-type machine is modulated by relative axial movement between the scroll members so as to form a leakage path across the wrap tips and opposed end plates. In another group of embodiments, modulation is achieved by reducing the orbital radius of one of the scroll members to thereby form a leakage path across the flank surfaces of the wraps. Both types of scroll separation may be accomplished in a time pulsed manner to thereby enable a full range of modulation with the duration of the loading and unloading periods being selected to maximize the efficiency of the overall system.

Abstract: A scroll-type machine is disclosed which is particularly well suited for use as a compressor in refrigeration and air conditioning systems and incorporates a unique arrangement for modulating the capacity thereof. In one group of embodiments the capacity of the scroll-type machine is modulated by relative axial movement between the scroll members so as to form a leakage path across the wrap tips and opposed end plates. In another group of embodiments, modulation is achieved by reducing the orbital radius of one of the scroll members to thereby form a leakage path across the flank surfaces of the wraps. Both types of scroll separation may be accomplished in a time pulsed manner to thereby enable a full range of modulation with the duration of the loading and unloading periods being selected to maximize the efficiency of the overall system.

Abstract: A scroll-type compressor which is particularly suited for use as a refrigerant compressor has a biasing chamber for pressure biasing the non-orbiting scroll to augment tip sealing. The biasing chamber communicates with the fluid pockets of the compressor through a biasing passage extending through the end plate of the non-orbiting scroll. The biasing passage is in fluid communication with the innermost fluid pocket during only a portion of each of the cycles of orbiting motion and in fluid communication with an intermediate fluid pocket during another portion of the cycles orbiting motion.

Abstract: The microprocessor-based HVAC control system detects sensor faults by comparing thermistor readings with predetermined extreme values, indicative of sensor fault. The system automatically selects the appropriate combination of automatic/preset modes of operating key system components such as the expansion valve, the demand defrost system and the indoor fan speed control system. With a view towards minimizing any negative impact on system performance and reliability in the event of sensor malfunction.

Abstract: A hermetic motor compressor includes a shell, first and second scroll members and a closure member extending across a portion of the interior of the shell adjacent one end of the shell to define a discharge chamber. A discharge port in the scroll member located closest to the closure member provides fluid communication between the center of the scroll members and the discharge chamber through an opening in the closure member. A seal member located between the closure member and the scroll member places the discharge port in sealed fluid communication with the discharge chamber.

Abstract: There is disclosed a scroll-type machine particularly suited for use as a refrigeration compressor and incorporating an improved baffle arrangement to provide a directed suction inlet as well as to separate oil entrained in the returning refrigerant and return same to the lubricant sump in the lower portion of the shell.

Abstract: There is disclosed a scroll-type machine particularly suited for use as a refrigerant compressor and incorporating an improved lubrication system for the drive.

Abstract: There is disclosed a scroll-type machine particularly suited for use as a refrigeration compressor and incorporating an improved baffle arrangement to provide a directed suction inlet as well as to separate oil entrained in the returning refrigerant and return same to the lubricant sump in the lower portion of the shell.

Abstract: There is disclosed a scroll-type machine particularly suited for use as a refrigerant compressor and incorporating Oldham coupling utilizing a novel ring element which is non-circular and provides for increased thrust-bearing size, or reduced machine size.

Abstract: There is disclosed a scroll-type machine particularly suited for use as a refrigerant compressor and incorporating an improved suspension system for the non-orbiting scroll whereby the latter may be pressure biased for the purpose of augmenting tip sealing. The machine also has a modified wrap tip and end plate profile in order to enhance performance, as well as an improved lubrication system for the drive and a baffle arrangment to provide a directed suction inlet. The machine also has an Oldham coupling utilizing a novel ring element which is non-circular and provides for increased thrust-bearing size, or reduced machine size. There is also disclosed a method of manufacture of a scroll-type machine.

Abstract: There is disclosed a scroll-type machine particularly suited for use as a refrigerant compressor and incorporating an improved suspension system for the non-orbiting scroll whereby the latter may be pressure biased for the purpose of augmenting tip sealing. The machine also has a modified wrap tip and end plate profile in order to enhance performance, as well as an improved lubrication system for the drive and a baffle arrangement to provide a directed suction inlet. The machine also has an Oldham coupling utilizing a novel ring element which is non-circular and provides for increased thrust-bearing size, or reduced machine size. There is also disclosed a method of manufacture of a scroll-type machine.