Editing Scroll compressor (section)

==Design==
A scroll compressor uses two interleaving scrolls to [[pump]], [[Gas compressor|compress]] or pressurize [[fluid]]s such as [[liquids]] and [[gas]]es. The vane geometry may be [[involute]], [[Archimedean spiral]], or hybrid curves.<ref>{{cite patent |inventor1-first=Arai |inventor1-last=Nobukatsu |inventor2-first=Kousokabe |inventor2-last=Hirokatu |inventor3-first=Sato |inventor3-last=Eiji |inventor4-first=Tojo |inventor4-last=Kenji |title=Scroll Compressor with Means for End-Plate Bias and Cooled-Gas Return to Sealed Compressor Spaces |country=US |number=4216661 |pubdate=1980-08-12 }}</ref><ref>{{Cite patent |inventor1-last=Tischer |inventor1-first=J. |inventor2-last=Utter |inventor2-first=R |title=Scroll Machine Using Discharge Pressure For Axial Sealing |country=US |number=4522575 |pubdate=1985-06-11 }}</ref><ref>{{Cite patent|inventor1-last=Caillat |inventor1-first=J. |inventor2-last=Weatherston |inventor2-first=R. |inventor3-last=Bush |inventor3-first=J |title=Scroll-Type Machine With Axially Compliant Mounting  |country=US |number=4767293 |pubdate=1988-08-30 }}</ref><ref>{{Cite patent |inventor-last=Richardson, Jr. |inventor-first=Hubert |title=Scroll Compressor With Orbiting Scroll Member Biased By Oil Pressure |country=US |number=4875838 |pubdate=1989-10-24 }}</ref><ref>{{Cite patent |inventor1-last=Etemad |inventor1-first=S. |inventor2-last=Yannascoli |inventor2-first=D. |inventor3-last=Hatzikazakis |inventor3-first=M. |title=Scroll Machine with Wraps of Different Thicknesses |country=US |number=4834633 |pubdate=1989-05-30 }}</ref>

Often, one of the scrolls is fixed, while the other orbits [[Eccentricity (mechanics)|eccentrically]] without rotating, thereby trapping and pumping or compressing pockets of fluid between the scrolls. An eccentric shaft can provide the orbital motion but the scroll must be prevented from rotating, typically with an [[Oldham coupling|Oldham-type coupling]], additional eccentric idler shafts, or a [[Metal bellows|bellows joint]] (particularly for high-purity applications). Another method for producing the compression motion is co-rotating the scrolls, in synchronous motion, but with offset centers of rotation. The relative motion is the same as if one were orbiting.

Leaks from axial gaps are prevented by the use of spiral-shaped tip seals, placed into grooves on the tips of both spirals.<ref>{{cite conference|url=https://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=3291&context=icec |conference=22nd International Compressor Engineering Conference at Purdue|date=July 14–17, 2014|page=1255|title=Seal Mechanism of Tip Seal in Scroll Compressor |author=Mitsuhiro Fukuta |author2=Daisuke Ogi |author3=Masaaki Motozawa |author4=Tadashi Yanagisawa |author5=Shigeki Iwanami |author6=Tadashi Hotta |access-date=September 13, 2019 |archive-date=March 22, 2020 |archive-url=https://web.archive.org/web/20200322085022/https://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=3291&context=icec |url-status=live }}</ref> These tip seals also help lower the friction and can be replaced when worn down. 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.<ref>{{Cite web |url=https://www.daikin.com/products/ac/lineup/vrv/|title=New Scroll Compressor &#124; Air Conditioning and Refrigeration |publisher=[[Daikin]] |access-date=March 30, 2020 |archive-date=May 22, 2020 |archive-url=https://web.archive.org/web/20200522090915/https://www.daikin.com/products/ac/lineup/vrv/ |url-status=live }}</ref><ref>{{Cite web |url=https://www.testequity.com/how-a-scroll-compressor-works |title=How a Scroll Compressor Works |website=TestEquity |access-date=March 30, 2020 |archive-date=September 27, 2020 |archive-url=https://web.archive.org/web/20200927003926/https://www.testequity.com/How-a-Scroll-Compressor-Works |url-status=live }}</ref><ref>{{Cite web |url=https://climate.emerson.com/documents/copeland-scroll-digital-simple-refrigeration-solution-for-capacity-modulation-en-gb-4204140.pdf |title=Copeland Scroll Digital |date=April 10, 2019 |publisher=[[Emerson Electric]] |archive-date=April 11, 2021 |archive-url=https://web.archive.org/web/20210411150319/https://climate.emerson.com/documents/copeland-scroll-digital-simple-refrigeration-solution-for-capacity-modulation-en-gb-4204140.pdf |url-status=live |access-date=September 2, 2024 }}</ref><ref>{{Cite web |url=https://climate.emerson.com/documents/zfkq-product-catalogue-ja-jp-4231574.pdf |title=Archived copy |access-date=March 30, 2020 |archive-date=April 11, 2021 |archive-url=https://web.archive.org/web/20210411150319/https://climate.emerson.com/documents/zfkq-product-catalogue-ja-jp-4231574.pdf |url-status=live }}</ref>