A method of operating a refrigeration system, that includes providing a plurality of compressors connected in parallel. The plurality of compressors includes a plurality of scroll compressors. The method further includes returning circulated refrigerant to the plurality of compressors, the circulated refrigerant having oil entrained therein. Returning circulated refrigerant to the plurality of compressors includes returning more oil to one of the plurality of compressors than to another of the plurality of compressors. The method also includes supplying oil from one of the plurality of compressors to at least one other of the plurality of compressors. Supplying oil from one of the plurality of compressors includes supplying oil from the one of the plurality of compressors having an opening in its housing. A fitting is assembled into the opening. The fitting protrudes through the housing into an interior portion of the housing.

Apparatus and method for oil equalization in multiple-compressor systems

Scroll technology for refrigerant compressors is reviewed from the initial invention to today’s position as a dominant compression technology in the air conditioning industry, including a projection of the future potential of the technology. Design concepts from the past 30 years are reviewed, including scroll component vane design, compliance mechanisms, bearing and assembly architecture, and low and high side pressure vessels. Manufacturing challenges related to scroll compressor machining and assembly are also discussed. Scroll compressors are now used outside the initial residential air conditioning application to include heat pump and refrigeration systems that require scroll designs suitable for use with both higher pressure ratios and extended operating envelopes. Increased efficiency standards for air conditioning and refrigeration systems continue to drive the development of efficient capacity control methods utilizing various technologies such as discrete capacity steps, vapor injection/economizer cycle and inverter driven variable speed operation. These concepts are reviewed and their individual benefits are discussed.

Scroll Technology: An Overview of Past, Present and Future Developments

In a revolution type compressor using a balance weight for balancing a rotating mass, the effect of oil churn reduction is enhanced, and compressor input is reduced. A balance weight fixed to a drive shaft between a rotor of an electric motor 4 and a compression mechanism includes a weight portion in a substantially semicircular column shape for balancing a rotating mass, a cover portion which is substantially semi-cylindrical and has an opening in the vicinity of a top and bottom at an opposite side in a radial direction from the weight portion, and a hollow space surrounded by the weight portion and the cover portion. Further, a space for discharging oil is provided between the balance weight and the rotor. By the structure, reduction in oil churn, and reduction in input of the compressor are realized, and the compressor with less power consumption is obtained.

Revolution type compressor

A balancing system for different compressors utilizes a counterweight having a common exterior configuration. The mass of the counterweight is optimized for each compressor by changing the size of a recess located in the counterweight. In one embodiment, the recess is an arcuately shaped recess; and in another embodiment, the recess is a plurality of holes.

Scroll machine having counterweights with changeable cavity

A compressor may include a compressor housing, an oil sump, an intake chamber, a compression mechanism, a drive shaft, and a first oil passage. The oil sump may be in communication with the compression mechanism. The intake chamber may be defined within the housing. The drive shaft may include first and second ends with an oil inlet passage located therebetween. The first end may be disposed within the intake chamber and may be drivingly engaged with the compression mechanism. The second end may extend outside of the housing for driven engagement external to the housing. The oil inlet passage may be located within the intake chamber. The first oil passage may be disposed within the housing and in communication with the oil sump and the oil inlet passage.

Open drive scroll compressor with lubrication system

A scroll machine is powered by a brushless permanent magnet motor. The rotor for the motor includes a rotor body formed by a plurality of laminations and an upper and lower counterweight made of zinc and located at opposite ends of the rotor body. An attachment member extends through the counterweights and the rotor body to secure the counterweights and the plurality of laminations. The counterweights include steel inserts which cooperate with the attachment member to provide a metal to metal clamping for the rotor body with a steel connection being maintained through the rotor.

Scroll machine with brushless permanent magnet motor

A horizontal scroll-type compressor utilizes the pressure differential between the discharge pressure and the suction pressure to route lubricant from the discharge chamber to the components within the intake chamber. The compressor may utilize a lubricant separator within the discharge chamber to separate the working fluid from the lubricant prior to the working fluid exiting the compressor. The compressor may use an internal passageway that extends from the discharge chamber to a position adjacent the crankshaft to provide lubricant to the internal lubricant passage within the crankshaft.

Horizontal scroll compressor

With the need for increasing vehicle efficiency, reliability and refrigerant containment, vehicle manufactures are considering electric powered accessories as a replacement for current engine driven components. Electric hermetic and semi-hermetic air conditioning and refrigeration compressors are well suited for this application by providing the potential for both improved efficiency and capacity control along with the long life required by many transport applications. To meet the needs of this demanding application, a horizontal hermetic scroll compressor has been developed and tested over a broad range of operating conditions and speeds. The compressor design detailed in this paper utilizes a brushless permanent magnet (BPM) motor to provide high motor efficiency over a broad speed range while significantly reducing the size and weight of the motor. In addition the design utilizes many of the same components as a vertical scroll compressor but combines a suction gas cooled motor with a high-pressure oil sump. A mathematical model is presented for estimating the effect of high-to-low oil flow on compressor performance versus size, speed and operating condition. Volumetric efficiency is compared with a comparable high performance vertical scroll compressor.

/pdf/horizontal-scroll-compressor-for-transport-applications-49mvtm46ej.pdf

Horizontal scroll compressor for transport applications

Scroll machine with brushless permanent magnet electric motor

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Scroll machine with brushless permanent magnet motor

Horizontal scroll compressor

Horizontal scroll compressor for transport applications

Scroll machine with brushless permanent magnet electric motor