Tecumseh Products Company

Emanuel D Fry

Edwin L Gannaway

Nelik I Dreiman

Tara C Kandpal

Herbert G Siewert

Scott L Reiniche

A hermetic compressor including a hermetically sealed housing having a first housing shell and a second housing shell, a compressor unit disposed in the housing, a motor having a stator and a rotor, the rotor rotatably connected to a crankshaft drivingly connected to the compressor unit, a welding flange connected to the first and second housing shells to provide a hermetically sealed housing assembly, and an acoustic insulator interposed between the compressor unit and the welding flange, the acoustic insulator made from a vibration absorbing material, whereby the insulator reduces the communication of vibrations from the compressor unit to the housing during compressor operation.

Hermetic compressor having acoustic insulator

A compressor or pump assembly including a housing, a compression mechanism disposed within the housing, a shaft operatively connecting the compression mechanism and a drive source, the shaft having an axis of rotation and first and second surfaces, the shaft axis of rotation disposed between the first and second shaft surfaces, and a counterweight disposed about the shaft and comprising first and second portions, the first counterweight portion generally U-shaped, having first and second arms, the first arm in contact with the first shaft surface, the second arm in contact with the second shaft surface, the second counterweight portion extending between the first and second arms and attached to the first counterweight portion, the shaft captured between the first and second counterweight portions, whereby rotation is imparted to the counterweight through the interface of the shaft surfaces and the arms.

Detachably affixed counterweight and method of assembly

A compressor assembly includes a compressor mechanism mounted within a hermetically sealed housing. The housing is effectively divided into a low pressure area at a relatively low temperature and a high pressure area at a relatively high temperature. A motor and a lubrication system are contained within the low pressure area and the discharge side of the compressor mechanism is disposed in the high pressure area. A cylinder block effectively separates the high and low pressure areas of the compressor. The lubrication system includes an axial passage for communication oil from a sump to various compressor components, including rotational bearings. A seal cap is disposed at the end of the crankshaft that extends into the high pressure area and in combination with the cylinder block defines an oil discharge chamber at low pressure and isolated from the high pressure area. A second vent passage formed in the upper end portion of the crankshaft provides a communication path between a suction cavity formed in the compressor mechanism and the oil discharge chamber within the seal cup. A pressure drop caused by the reciprocating action of the pistons in the compressor mechanism occurs at the oil discharge area formed in the seal cup thereby assisting the oil pump in drawing oil through the oil passage in the crankshaft. An acoustic insulator is provided intermediate the compressor mechanism and a mounting flange to isolate and reduce vibration and noise which occurs during compressor operation.

Hermetic reciprocating compressor having a housing divided into a low

A compressor having an oil pick-up tube which filters incoming lubricant, and increases the volumetric pumping capacity of the compressor. The oil pick-up tube is attached to the crankshaft of the compressor, and is partially disposed within an oil sump also provided in the compressor. When the motor of the compressor is energized, the crankshaft and the oil pick-up tube rotate, and oil from the oil sump is drawn into the oil pick-up tube. A passageway is provided within the motor shaft to communicate oil from the oil pick-up tube to the compressor mechanism of the compressor for lubrication purposes. A cylindrical screen is also provided within the oil pick-up tube to both filter the incoming oil and provide a surface to which the oil adheres as it migrates upward through the rotating tube and expels the oil radially outward to increase the velocity of the migrating oil. The volumetric pumping capacity of the compressor is thereby increased. A pitot tube is provided at the top of the axial oil passageway to create an additional vacuum within the axial oil passageway and thus increase the volumetric pumping capacity of the compressor.

Compressor with improved oil pump and filter assembly

A compressor assembly is disclosed including a compressor mechanism mounted within a hermetically sealed housing. A cylinder block assembly, containing a plurality of reciprocating pistons within compression chambers, is covered by cylinder heads. The compression chambers include a discharge valve which permits compressed refrigerant to empty into a common discharge chamber. A pressure relief mechanism, formed by cylinder heads yieldably attached to the crankcase, is included within the compressor to eliminate damage caused by high pressure conditions such as slugging. Alternatively, pressure relief may be created in the common discharge chamber by a yieldably attached cage bearing or a valved port.

Compressor pressure relief assembly

A crankshaft having a high stress portion including a crankpin and an eccentric. The high stress portion is formed of a forged steel material having a first axial end. A reduced stress portion is formed from an unforged steel material and generally comprises a tubular cylindrical portion having a second axial end. The first axial end is secured to the second axial end by friction welding. A separate counterweight is attached to either the high stress portion or the reduced stress portion.

Reduced material crankshaft fabrication

A compressor assembly is disclosed including a compressor mechanism mounted within a hermetically sealed housing. A cylinder block contains a plurality of reciprocating pistons within compression chambers. The compression chambers include a discharge valve which permits compressed refrigerant to empty into the common discharge chamber. A baffle system is included within the common discharge muffler chamber to eliminate pressure pulses and cross talk between discharge valve assemblies, thereby increasing the discharge valve opening speed and correspondingly increasing the compressor efficiency.

Internal baffle system for a multi-cylinder compressor

A grounding clip for connecting an electrical grounding lead to the grounding stud of a compressor. The device includes an electrically conductive body having an aperture and a plurality of resilient ears adjacent the aperture for resiliently, frictionally engaging the stud when the stud is disposed in the aperture. The resilient ears permit axial movement of the stud through the aperture in one direction only and prevent axial movement of the stud through the aperture in the other axial direction. The device also includes an opening in which a threaded fastener is received to connect an electrical grounding lead thereby electrically connecting the grounding lead to the grounding stud and compressor housing.

Rotary compressor electrical ground device

A hermetic compressor assembly is disclosed including a compressor mechanism and an electric drive motor within a hermetically sealed housing. The electric motor includes a rotatable rotor and a stator. In one disclosed embodiment, the stator is friction fit within the housing and a rotor is press fit over a crankshaft journalled in a crankcase of the compressor mechanism. The crankcase is selectively positioned within the housing and mounted thereto by means of mounting pins. In another disclosed embodiment, the motor is mounted to the compressor mechanism and the compressor crankcase is axially supported in the housing. A mounting pin is used to prevent rotation of the compressor mechanism within the housing caused by torque forces produced by dynamic operation of the motor. The disclosed mounting pins are received within holes in the crankcase and extend radially outwardly through oversized apertures in the housing. The pins are selectively positioned in the apertures prior to welding. A method of assembling a compressor having mounting pins is also disclosed.

Hermetic compressor mounting pin

A protective cap for the hermetic terminal of a hermetic compressor includes a cup-shaped plastic member for attaching to and covering the hermetic terminal during manufacturing, shipping, and storage of the compressor, i.e., whenever the hermetic terminal would not otherwise be connected to an external source of power. The cap contactingly engages the base portion and conducting pins of the hermetic terminal. The protective cap includes a cylindrical stud portion arranged coaxially within an outer cylindrical wall portion of the cup-shaped member. The stud portion slip fits radially inwardly of the circularly arranged conductor pins of the hermetic terminal. A tapered end facilitates guided insertion of the stud portion within the conductor pins prior to engagement of the cap with the hermetic terminal base portion.

Compressor including protective cap for hermetic terminal

A compressor cylinder head assembly for a compressor which has a crankcase and a plurality of cylinders disposed in the crankcase. Each valve plate is spaced from the cylinder head by a valve plate gasket which is selected to have a thickness to provide the proper amount of clearance between the top of the piston and the valve plate to thereby keep the cylinder clearance in a predetermined range.

Compressor cylinder head

A compressor assembly including an electric motor and a compressor crankcase. The compressor crankcase includes a suction inlet. A motor casing is secured to the crankcase. The suction inlet is connected by means of a first passage to the interior of the motor casing. A baffle located in the motor casing causes a portion of the inflowing refrigerant suction gas to be diverted to flow over and cool the rear windings of the motor. The remainder of the inflowing gas is caused to flow over and cool the front windings of the motor. After flowing over the windings, the two portions of the suction gas are recombined and the suction gas is then caused to flow out of the motor casing to the compressor cylinder suction inlet.

Gas flow system for a compressor

An injection cooling arrangement for a rotary compressor whereby the heat of compression may be reduced more efficiently. A liquid refrigerant line is connected to the high pressure side of the refrigeration system between the condenser and the expansion device at one end thereof and at the other end is connected to a refrigerant inlet path located within the compression cylinder. The inlet path is connected to an orifice leading into the compression bore. The inlet path decreases in cross-sectional area as it leads from the liquid injection line to the orifice. The orifice is sized to allow for the restriction to take place at the entrance to the compression cylinder.

Liquid injection cooling arrangement for a rotary compressor

A compressor and suction accumulator assembly wherein the suction accumulator is mounted on the casing of the compressor. The accumulator includes a cylindrical casing having two end walls. A first end wall includes an inlet aperture and the second end wall includes an outlet aperture. The second end wall is circular and substantially flat and has a thickness greater than the casing of the accumulator. The outlet aperture in the circular second end wall is spaced radially outwardly from the center of the second end wall near the periphery thereof and is spaced further outwardly from the compressor casing than the center of the circular end wall. A suction tube extends through the outlet aperture into the accumulator casing and is bent inwardly toward the center of the accumulator casing whereby the inlet opening of the suction tube is disposed coaxially with the cylindrical casing of the accumulator. The other end of the suction tube is bent at right angles with respect to the first end and extends into the compressor casing. The assembly may also further include a screen dispose between the inlet and outlet apertures of the accumulator casing.

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Tecumseh, MI, United States of America

Emanuel D Fry