Abstract: A valve plate for a motor compressor has a continuously smooth figure-eight shaped port for reducing stresses along the primary longitudinal axis of a reed valve associated with the port, and an arrangement for providing a mechanical interlock for a head gasket to inhibit pressure loss between adjacent compressor cylinders.

Abstract: A pair of thrust washers support the lower end of a crankshaft for rotation in a bearing in a hermetic refrigerant motor compressor and also provide a combination of oil passages for supplying lubricating oil to a pump in a crankshaft and from the pump to the bearing.

Abstract: A scroll machine having an eccentric crank pin on a cranshaft disposed nonrotatably in the bore of a drive busing for driving the orbiting scroll of the compressor. A flat on the crank pin drivingly engages a flat in the bore, one flat being at an acute angle to the normal cranksahft axis so that when the crankshaft deflects under normal loads the flats come into better contact with one another to reduce unwanted wear. Several other embodiments are also disclosed.

Abstract: An improved arrangement for securing a counterweight to a rotor of an electric motor is disclosed wherein the counterweight includes a body portion disposed entirely on one side of a diametrical plane extending along the axis of rotation of the rotor and flange portions for securing said counterweight to the rotor are disposed on the other side of this plane.

Abstract: There is disclosed a refrigeration system employing multi-stage compressors, several unique modes of operation thereof, a sub-cooler/economizer for sub-cooling the condensed refrigerant prior to vaporization in the evaporator, as well as an improved expansion valve arrangement for controlling second stage discharge temperature, another valve arrangement for controlling economizer liquid discharge temperature, an interstage intercooler for use in a hot water system, a satellite compressor arrangement for ultra-low temperature applications, and an improved liquid-suction heat exchange arrangement.

Abstract: There is disclosed a scroll-type machine suited for use as a gaseous fluid compressor. The machine incorporates symmetrical scroll members of substantially one wrap that have modified inner ends to provide continued sealing to a single separation point. The one wrap configuration and modified ends provide a very compact compressor design that enhances manufacturability and yet is able to deliver fluid gas with much greater pressure ratio versatility than conventional multi-wrap scroll compressors. The machine incorporates a discharge valve in the discharge port that allows various pressure ratios to be attained for a variety of end uses.

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.

Abstract: A unique multi-stage refrigeration system for multiple product-display cases in which each display case has a low-stage booster compressor disposed therein. Each booster compressor compresses refrigerant received from the evaporator in its display case and feeds same to a bank of high-stage compressors disposed in a remotely located equipment room. A mechanical sub-cooler is provided for controlling liquid refrigerant temperature, and an improved lubrication system is provided for balancing the distribution of lubricant throughout the system. Several modifications of the system are also shown.

Abstract: An improved valve assembly is disclosed, in which the valve assembly is provided with noise attenuation and is especially well-suited for use in refrigeration compressors. The valve assembly includes a retainer member fixed to a valve plate having a flow opening therethrough with a movable valve member therein between the retainer member and the valve plate. The retainer member edges are spaced relatively close to the valve plate to define a relatively small effective flow area therebetween, with additional effective flow area being provided by one or more openings through the valve plate. This arrangement provides for rapid fluid pressurization in the area between the valve member and the retainer member during valve opening in order to minimize impact forces transmitted from the valve member to the retainer member, thereby reducing noise emanating from the valve assembly.

Abstract: A method and several embodiments of apparatus are disclosed for modulating the capacity of a gas compressor. A discharge valve member is formed with an opening therein and fluid communication between the compression chamber and a clearance pocket is selectively established by a slidable plunger element. In a first position, the plunger fills the opening in the discharge valve member to close fluid communication between the clearance pocket and the compression chamber. In a second position, the plunger element moves away from the valve member to establish fluid communication between the compression chamber and the clearance pocket, wherein the reexpansion volume is increased and the capacity of the compressor reduced. In the preferred embodiment, an apertured neck member is provided. The valve member is slidably guided by outer walls of the neck member, and the plunger has a stem designed to slidingly fit within the neck aperture.

Abstract: A scroll machine is disclosed in which the wrap of one of the scroll members is formed in two pieces which can be moved with respect to one another to change the effective thickness of the wrap and hence the displacement of the machine.

Abstract: There is disclosed a scroll-type machine specifically suited for use as a gaseous fluid compressor. The machine incorporates an improved rotation controlling mechanism which is extremely simple in construction, several embodiments of which are disclosed. This mechanism does not eliminate relative rotation between the scrolls but limits it to a relatively small predetermined amount. Several novel techniques for contouring the profiles of the scroll wrap flanks to give good flank sealing with the aforesaid rotation controlling mechanism are also disclosed, as are two embodiments of an improved scroll drive mechanism and an improved thrust bearing arrangement. A novel method of machining a scroll is also disclosed.

Abstract: A refrigeration system characterized by a first stage booster compressor feeding multiple parallel connected second stage compressors in an otherwise conventional closed loop refrigeration system utilizing an economizer between the condenser and evaporator and returning economizer vapor to the inter-stage pressure point between the first stage and second stage compressors operates in a very flexible and highly efficient manner by driving the booster, first stage compressor at variable speed and the second stage compressor(s) at constant speed, at maximum capacity, with those machines incapable of being unloaded. The control system utilizing a sensor for sensing evaporator pressure, evaporator temperature or suction pressure, varies the speed of the drive motor for the first stage booster compressor to initially slow down the booster and secondly connect or disconnect the second stage compressor from the system. The booster is always operating and the economizer is always active in the system.

Abstract: A hermetic refrigeration compressor system comprises a sealed shell containing two motor-compressor units of different capacities and also containing a suction gas accumulator through and from which suction gas is delivered to both units, the interior of the shell being at suction pressure; gas from an outlet of the accumulator being directed into an aligned, spaced inlet in the motor cover of the smaller unit. Both units are spring-mounted on a unitary support within the shell.

Abstract: A refrigeration compressor is disclosed which includes a compressor means, a two phase motor drivingly connected thereto and an associated power supply operative to convert single phase 60 hertz alternating current to two phase controlled frequency alternating current so as to enable the compressor to be operated from conventional single phase power and at any point within a range of speeds commensurate with the loading thereon. The power supply also includes improved filtering means for each of the output phases of the power supply. A line break motor protector is also provided which is particularly well suited for use with two phase motors. Additionally, in order to increase reliability, circuitry is also provided for directly connecting the two phase motor to the single phase power supply in such a manner so as to enable the two phase motor to be operated directly from the single phase supply in the event of failure of the two phase power supply.

Abstract: An improved oil pump assembly for a refrigeration compressor is disclosed which includes a sensor located within the oil pump housing which is operative to de-energize the compressor in the event the pressure differential between the inlet and outlet of the oil pump drops below a predetermined level. Pressure sensing communication between the sensor and the inlet is provided via a cutout portion of the gasket between the pump and compressor housing.

Abstract: An improved discharge valve assembly for use with compressors and particularly the type utilizing a disc-like pressure responsive discharge valve is disclosed which includes a bridge element secured to a plate overlying the valve plate and one or more leaf spring biasing elements of the curved disc type positioned between the bridge element and disc valve member and being operative to urge the valve into a closed position. The bridge element is also provided with guide fingers to retain both the leaf spring elements and valve member in operative position.

Abstract: A method of assembling a hermetic refrigeration motor compressor is disclosed wherein the motor stator is assembled in a first shell section, the compressor is assembled in another shell section and the two shell sections are aligned and secured together in such a manner as to insure a uniform air gap between the rotor and stator. The method employed enables the two shell sections to be initially locked in position before complete welding of the periphery so as to avoid potential heat distortion.