Tecumseh Products Company

Brazeway, Inc.

Robert E Utter

David K Haller

A dog-bone type heat exchanger having a plurality of fin members for dissipating heat. Each of the plurality of fin members includes a pair of offset surfaces interconnected by a sloped interconnecting surface. The plurality of fins members may be spaced apart at a distance that is less than, equal to, or more than the offset distance between the pair of offset surfaces on each fin member, thereby maximizing the mixing of air flow and the conductive heat transfer of the heat exchanger through an impinging effect.

Plate-fin and tube heat exchanger with a dog-bone and serpentine tube insertion method

A scroll compressor having a suction chamber into which fluid is received substantially at suction pressure and a discharge chamber from which the fluid is discharged substantially at discharge pressure, including mutually engaged fixed and orbiting scroll members, in fluid communication with the suction and discharge chambers, an intermediate pressure chamber defined in part by one of fixed and orbiting scroll members, an oil reservoir, an electric motor, and a shaft operably coupling the motor and the orbiting scroll member. The shaft is provided with a longitudinal passageway extending longitudinally therethrough, the longitudinal passageway in fluid communication with the oil reservoir and provided with oil therefrom. The shaft is provided with a first passage in fluid communication with the longitudinal passageway and which extends substantially laterally outward from the longitudinal passageway to a radially outer surface of the shaft. A roller is disposed about the shaft radially outer surface, the orbiting scroll member linked to the shaft through the roller. The roller is provided with inner and outer circumferential surfaces and a second passage extending therebetween, the first and second passages in fluid communication, whereby oil from the oil reservoir is provided to the roller outer circumferential surface through the longitudinal passageway and the first and second passages. A bearing is disposed between the roller outer circumferential surface and the orbiting scroll member. An oil receiving space is provided adjacent the bearing, the oil receiving space defined in part by a surface provided on the orbiting scroll member which is opposite its substantially planar surface, an axially facing surface of the roller, and an end surface of the shaft. The intermediate pressure chamber and the oil receiving space are substantially out of fluid communication. Oil is provided from the second passage to the oil receiving space through the bearing. A third passage extends between the oil receiving space and an intermediate pressure space between the fixed and orbiting involute wrap elements, and oil is provided to the intermediate pressure space from the oil receiving space through the third passage.

Bearing lubrication system for a scroll compressor

A valve for regulating pressure intermediate suction and discharge pressure in a scroll compressor having an axially sealing interface between a fixed and orbiting scroll member through which the axial relationship between the scroll members may be controlled. The scroll members are axially biased together by refrigerant gas at a pressure intermediate the suction and discharge pressures and which is disposed in an intermediate pressure chamber defined in part by a generally planar surface of the orbiting scroll member. A self-regulating sliding valve, actuated by forces exerted on axial valve surfaces by suction, discharge and intermediate gas pressures, controls the amount of intermediate gas pressure in the intermediate gas pressure chamber. An annular groove in fluid communication with a longitudinal bore within the valve body and which opens to the intermediate pressure chamber is moved between a first position, in which the annular valve groove communicates with a passage to the compressor discharge pressure chamber, and a second position, in which the annular valve groove communicates with a passage to the compressor suction pressure chamber, placing the intermediate pressure chamber in communication with the discharge and suction pressure chambers, respectively. A third position, intermediate the first and second positions, seals the intermediate pressure chamber. Hence the axial engagement force exerted between the fixed and orbiting scroll members is controlled and a constant wrap to face clearance between the fixed and orbiting scroll members is maintained.

Growing community of inventors

Adrian, MI, United States of America

Robert E Utter