Linear compressor

<h2 id="history">History</h2>
A number of patents for linear compressors powered by <a href="/facts/Free-piston_engine/tB9DhMJ8">free-piston engines</a> were issued in the 20th century, including:

<ul><li>To <a href="/facts/Brown%2c_Boveri_%2526_Cie/9CDSUasq">Brown, Boveri & Cie</a>, GB191215963, published 1913-10-08<a class="footnote-ref" id="fnref:2" href="#fn:2">2</a></li>
<li>To <a href="/facts/Hugo_Junkers/QqVlgtYc">Hugo Junkers</a>, CA245708, published 1924-12-30<a class="footnote-ref" id="fnref:3" href="#fn:3">3</a></li>
<li>To <a href="/facts/Ra%25C3%25BAl_Pateras_Pescara/vXYbnyYr">Raúl Pateras Pescara</a>, US1615133, published 1927-01-18<a class="footnote-ref" id="fnref:4" href="#fn:4">4</a></li></ul>
The first market introduction of a linear compressor to compress <a href="/facts/Refrigerant/rI60t5zU">refrigerant</a> in a <a href="/facts/Refrigerator/TGb5ozLY">refrigerator</a> was in 2001.<a class="footnote-ref" id="fnref:5" href="#fn:5">5</a>

<h2 id="valved-linear-compressor">Valved linear compressor</h2>
The single piston linear compressor uses dynamic counterbalancing, where an auxiliary movable mass is flexibly attached to a movable piston assembly and to the stationary compressor casing using auxiliary mechanical springs with zero vibration export at minimum electrical power and current consumed by the motor.<a class="footnote-ref" id="fnref:6" href="#fn:6">6</a> It is used in <a href="/facts/Cryogenic/cw7dHAkp">cryogenics</a>.<a class="footnote-ref" id="fnref:7" href="#fn:7">7</a> Linear compressors are used as they have fewer mechanical losses.<a class="footnote-ref" id="fnref:8" href="#fn:8">8</a>
Linear compressors are made by LG and used in LG and Kenmore refrigerators. Linear compressors were also announced by <a href="/facts/Embraco/m4N5IUl3">Embraco</a>.<a class="footnote-ref" id="fnref:9" href="#fn:9">9</a><a class="footnote-ref" id="fnref:10" href="#fn:10">10</a> Compressors of this type have less noise, and are more energy efficient than conventional refrigerator compressors. The Embraco linear compressors are also claimed to be oil-free. In the 2010s and 2020s, multiple lawsuits in the United States alleged that the LG compressors had a high rate of failure or lack of expected cooling. As of 2024, there were settlements<a class="footnote-ref" id="fnref:11" href="#fn:11">11</a> and ongoing cases.<a class="footnote-ref" id="fnref:12" href="#fn:12">12</a>

<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/Booster_pump/E3cBvRVr">Booster pump</a> – Machine to increase pressure of a fluid</li>
<li><a href="/facts/Hydrogen_compressor/IdYDXH0P">Hydrogen compressor</a> – Device to increase pressure of hydrogen gas</li>
<li><a href="/facts/Liquid_hydrogen/Vpk3Gb8P">Liquid hydrogen</a> – Liquid state of the element hydrogen</li>
<li><a href="/facts/Timeline_of_low-temperature_technology/UhxEyE4Y">Timeline of low-temperature technology</a></li>
<li><a href="/facts/Timeline_of_hydrogen_technologies/fbaM5Q6y">Timeline of hydrogen technologies</a></li>
<li><a href="/facts/Scroll_compressor/87reCFut">Scroll compressor</a></li></ul>

<h2 id="external-links">External links</h2>
<ul><li>Blain, Loz (2021-11-03). <a href="https://newatlas.com/energy/magtor-efficient-compressor-energy-efficient/">"Super-efficient linear compressor could vastly reduce air con power use"</a>. New Atlas. Retrieved 2021-11-04.</li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1">Liang, Kun (2017). "A review of linear compressors for refrigeration" (PDF). International Journal of Refrigeration. 84: 253–273. doi:10.1016/j.ijrefrig.2017.08.015. <a href="http://sro.sussex.ac.uk/id/eprint/69918/1/Linear%20Compressor%20Review%20Accepted%20Version.pdf" target="_blank">http://sro.sussex.ac.uk/id/eprint/69918/1/Linear%20Compressor%20Review%20Accepted%20Version.pdf</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></li>
<li id="fn:2">"Espacenet : Original document". Worldwide.espacenet.com. Retrieved 5 November 2017. <a href="http://worldwide.espacenet.com/publicationDetails/originalDocument?CC=GB&NR=191215963A&KC=A&FT=D&ND=3&date=19131008&DB=EPODOC&locale=en_EP" target="_blank">http://worldwide.espacenet.com/publicationDetails/originalDocument?CC=GB&NR=191215963A&KC=A&FT=D&ND=3&date=19131008&DB=EPODOC&locale=en_EP</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></li>
<li id="fn:3">"Espacenet : Original document". Worldwide.espacenet.com. Retrieved 5 November 2017. <a href="http://worldwide.espacenet.com/publicationDetails/originalDocument?CC=GB&NR=191215963A&KC=A&FT=D&ND=3&date=19131008&DB=EPODOC&locale=en_EP" target="_blank">http://worldwide.espacenet.com/publicationDetails/originalDocument?CC=GB&NR=191215963A&KC=A&FT=D&ND=3&date=19131008&DB=EPODOC&locale=en_EP</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></li>
<li id="fn:4">"Espacenet : Original document". Worldwide.espacenet.com. Retrieved 5 November 2017. <a href="http://worldwide.espacenet.com/publicationDetails/originalDocument?CC=GB&NR=191215963A&KC=A&FT=D&ND=3&date=19131008&DB=EPODOC&locale=en_EP" target="_blank">http://worldwide.espacenet.com/publicationDetails/originalDocument?CC=GB&NR=191215963A&KC=A&FT=D&ND=3&date=19131008&DB=EPODOC&locale=en_EP</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></li>
<li id="fn:5">"Problems 4.7 - A Home Refrigerator (updated 3/15/13)". Ohio.edu. Retrieved 5 November 2017. <a href="http://www.ohio.edu/mechanical/thermo/Intro/Chapt.1_6/refrigerator/refrig_problems.html" target="_blank">http://www.ohio.edu/mechanical/thermo/Intro/Chapt.1_6/refrigerator/refrig_problems.html</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></li>
<li id="fn:6">Reed, Jaime; Dadd, Mike; Bailey, Paul; Petach, Michael; Raab, Jeff (2005). "Development of a valved linear compressor for a satellite borne J–T cryocooler". Cryogenics. 45 (7): 496–500. Bibcode:2005Cryo...45..496R. doi:10.1016/j.cryogenics.2005.03.007. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></li>
<li id="fn:7">Reed, Jaime; Dadd, Mike; Bailey, Paul; Petach, Michael; Raab, Jeff (2005). "Development of a valved linear compressor for a satellite borne J–T cryocooler". Cryogenics. 45 (7): 496–500. Bibcode:2005Cryo...45..496R. doi:10.1016/j.cryogenics.2005.03.007. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></li>
<li id="fn:8">"Linear compressor". <a href="https://patents.google.com/patent/US8496453B2/en" target="_blank">https://patents.google.com/patent/US8496453B2/en</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></li>
<li id="fn:9">"Oil-less linear compressor launched". Cooling Post. 2014-03-20. Retrieved 2024-02-28. <a href="https://www.coolingpost.com/world-news/oil-less-linear-compressor-launched/" target="_blank">https://www.coolingpost.com/world-news/oil-less-linear-compressor-launched/</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></li>
<li id="fn:10">"Embraco claims oil-less compressor breakthrough". <a href="https://www.acr-news.com/embraco-claims-oil-less-compressor-breakthrough" target="_blank">https://www.acr-news.com/embraco-claims-oil-less-compressor-breakthrough</a> <a href="#fnref:10" class="footnote-back-ref">↩</a></li>
<li id="fn:11">Wroclawski, Daniel (2020-09-17). "LG Settles Class-Action Lawsuit Over Refrigerator Compressors". Consumer Reports. Retrieved 2024-02-28. <a href="https://www.consumerreports.org/lawsuits-settlements/lg-settles-class-action-lawsuit-over-refrigerator-compressors/" target="_blank">https://www.consumerreports.org/lawsuits-settlements/lg-settles-class-action-lawsuit-over-refrigerator-compressors/</a> <a href="#fnref:11" class="footnote-back-ref">↩</a></li>
<li id="fn:12">Roher, Christine; Johnson, Carolyn (2023-12-19). "People say pricey refrigerator compressors are conking out within a few years, sometimes just months". NBC Los Angeles. Retrieved 2024-02-28. <a href="https://www.nbclosangeles.com/investigations/lg-refrigerator-compressor-lawsuit-appliances/3293828/" target="_blank">https://www.nbclosangeles.com/investigations/lg-refrigerator-compressor-lawsuit-appliances/3293828/</a> <a href="#fnref:12" class="footnote-back-ref">↩</a></li>
</ol>

Linear compressor open-in-new

Linear compressor