This class of pump is often called a 'hose pumper'. They have casings filled with lubricant to prevent abrasion of the exterior of the pump tube and to aid in the dissipation of heat, and use reinforced tubes, often called 'hoses'. Some compressors use the pressurized discharge gas to push both scrolls together, eliminating the need for tip seals and improving sealing with use these compressors are said to wear-in instead of wear-out, but other parts such as the Oldham ring can still wear out.Īnother variation is with flexible (layflat) tubing where the archimedean spiral acts as a peristaltic pump, which operates on much the same principle as a toothpaste tube. These tip seals also help lower the friction and can be replaced when worn down. Leaks from axial gaps are prevented by the use of spiral-shaped tip seals, placed into grooves on the tips of both spirals. The relative motion is the same as if one were orbiting. Another method for producing the compression motion is co-rotating the scrolls, in synchronous motion, but with offset centers of rotation. An eccentric shaft can provide the orbital motion but the scroll must be prevented from rotating, typically with an Oldham-type coupling, additional eccentric idler shafts, or a bellows joint (particularly for high-purity applications). Often, one of the scrolls is fixed, while the other orbits eccentrically without rotating, thereby trapping and pumping or compressing pockets of fluid between the scrolls. The vane geometry may be involute, Archimedean spiral, or hybrid curves. Design Ī scroll compressor uses two interleaving scrolls to pump, compress or pressurize fluids such as liquids and gases. They were not commercially produced for room air conditioning until 1983 when Hitachi launched the world's first air conditioner with a hermetic scroll compressor. In 1981, Sanden began manufacturing the first commercially available scroll compressors for automobile air conditioners. The first practical scroll compressors did not appear on the market until after World War II, when higher-precision machine tools enabled their construction. However, the scroll expander engine could not overcome the machining hurdles of radial compliance inherent to achieving efficiency in scroll operation that would not be adequately addressed until the works of Niels Young in 1975. In the 1905 patent, Creux defines a co-orbiting or spinning reversible steam expander driven by a fixed radius crank on a single shaft. Creux invented the compressor as a rotary steam engine concept, but the metal casting technology of the period was not sufficiently advanced to construct a working prototype, since a scroll compressor demands very tight tolerances to function effectively. Léon Creux first patented a scroll compressor in 1905 in France and the US (Patent number 801182). Animation of a spinning scroll compressor
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