# US 10,765,983 B2 · Filter for immersion cooling apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,765,983 B2 - Document ID: US10765983B2 - Status: Granted - Kind: B2 - Application number: 15/595,067 - Filed: 2017-05-15 - Published: 2017-11-16 - Granted: 2020-09-08 - Earliest claimed: 2016-05-16 - Assignees: Bitfury IP B.V. - Applicants: Bitfury Group Limited - Inventors: Kar-Wing Lau - Web page: https://patentgrep.com/patent/US10765983B2 ## CPC - B01D 46/0005: {Mounting of filtering elements within casings, housings or frames (B01D46/2422 takes precedence)} - B01D 46/0036: {by adsorption or absorption} - B01D 46/2411: {Filter cartridges} - H05K 7/20236: {by immersion} - H05K 7/20272: {Accessories for moving fluid, for expanding fluid, for connecting fluid conduits, for distributing fluid, for removing gas or for preventing leakage, e.g. pumps, tanks or manifolds} - H05K 7/203: {by immersion} - B01D 2265/021: Anti-rotational means - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ## Abstract An immersion cooling system for electronic equipment including a tank adapted to hold a liquid heat transfer fluid into which the electronic equipment can be immersed and a filter assembly(ies) having a filter housing with an inlet and an outlet and containing a filter cartridge. In some embodiments the filter assembly(ies) is adapted to be located in the heat transfer fluid in the tank, such that a cross-sectional area of the filter housing inlet is greater than a cross-sectional area of the filter housing outlet, the filter housing inlet is substantially vertically oriented on a side of the filter housing, the filter cartridge is positioned within the filter housing at an inclined angle relative to the filter housing inlet, and the filter housing outlet is disposed adjacent to a top of the housing. Advantageously, heat generated by the immersed electronic equipment produces a convective flow of heat transfer fluid through the filter housing. ## Claims ### Claim 1 An immersion cooling system for electronic equipment, wherein heat generated by the electronic equipment immersed in a heat transfer fluid produces a convective flow of the heat transfer fluid, the system comprising: a tank to hold the heat transfer fluid in liquid form into which the electronic equipment can be immersed; and at least one filter assembly, each filter assembly comprising: a filter housing through which the convective flow of heat transfer fluid travels and comprising an inlet and an outlet; and a filter cartridge contained in the filter housing, wherein, at least one filter assembly is located within the liquid heat transfer fluid in the tank; a cross-sectional area of the filter housing inlet is greater than a cross-sectional area of the filter housing outlet; the filter housing inlet is vertically oriented on a side of the filter housing; the filter cartridge is positioned within the filter housing at an inclined angle relative to the filter housing inlet; and the filter housing outlet is disposed adjacent to a top of the housing. ### Claim 2 (depends on 1) The immersion cooling system of claim 1, wherein the inclined angle is between 5 and 25 degrees. ### Claim 3 (depends on 1) The immersion cooling system of claim 1, wherein the inclined angle is between 12 and 18 degrees. ### Claim 4 (depends on 1) The immersion cooling system of claim 1, wherein the electronic equipment is immersed in the tank adjacent to a face of the filter housing inlet thereby forming a vertical channel through which heat transfer fluid flows over the electronic equipment and subsequently enters the filter housing inlet. ### Claim 5 A filter assembly for use with an immersion cooling system containing heat transfer fluid, said filter assembly comprising: a filter cartridge having a filter cartridge inlet and a filter cartridge outlet; and a filter housing having a filter housing inlet, a filter housing outlet, a horizontal top, and a vertical side; wherein, a cross-sectional area of the filter cartridge inlet is greater than a cross-sectional area of the filter cartridge outlet; the filter housing inlet is vertically oriented and formed in the vertical side of the filter housing; the filter cartridge is positioned within the filter housing at an inclined angle relative to the vertical side of the filter housing and the filter housing inlet; and the filter housing outlet is disposed at the top of the housing, such that a lowermost opening of the filter housing outlet is located above the filter cartridge outlet. ### Claim 6 (depends on 5) The filter assembly of claim 5, wherein the inclined angle is between 5 and 25 degrees. ### Claim 7 (depends on 5) The filter assembly of claim 5, wherein the inclined angle is between 12 and 18 degrees. ### Claim 8 (depends on 5) The filter assembly of claim 5, wherein the filter cartridge filters oil from the heat transfer fluid. ### Claim 9 (depends on 5) The filter assembly of claim 5, wherein cross-sectional areas of fluid conduit openings formed by the inlet and outlet of the filter housing and the filter cartridge decrease along a path of heat transfer fluid flow, thereby increasing a velocity of heat transfer fluid flow from the inlet of the filter housing to the outlet of the filter housing. ### Claim 10 (depends on 5) The filter assembly of claim 5, wherein the filter cartridge inlet extends across one side of the filter cartridge. ### Claim 11 (depends on 5) The filter assembly of claim 5, wherein the filter cartridge further comprises at least one cartridge surrounding surface that is perpendicular to a face of the filter cartridge inlet, the filter housing being shaped to conform to the at least one cartridge surrounding surface. ### Claim 12 (depends on 5) The filter assembly of claim 5, wherein the filter cartridge outlet is centered on a point within an upper half of the filter cartridge. ### Claim 13 (depends on 5) The filter assembly of claim 5 further comprising: at least one circular extruded bore hole for insertion of removable cylindrical locking rods that secure the filter cartridge, the filter cartridge being removable by removing the cylindrical locking rods. ### Claim 14 (depends on 5) The filter assembly of claim 5, wherein the filter cartridge comprises a carbon filter cartridge. ### Claim 15 (depends on 5) The filter assembly of claim 5, wherein the filter housing comprises a plurality of filter units disposed adjacent to each other, wherein each filter unit comprises a filter housing inlet, a filter housing outlet, and a filter cartridge. ### Claim 16 (depends on 15) The filter assembly of claim 15, wherein the filter housing inlet of each filter unit faces in a unique direction. ### Claim 17 (depends on 15) The filter assembly of claim 15, wherein the filter housing inlet of each filter unit faces in a first direction opposing a second direction faced by any adjacent filter unit. ### Claim 18 (depends on 5) The filter assembly of claim 5, wherein a vertical height of the filter housing is greater than a horizontal width of the filter housing. ### Claim 19 (depends on 5) The filter assembly of claim 5, further comprising a weight attached to a bottom surface of the filter assembly. ### Claim 20 (depends on 5) The filter assembly of claim 5, wherein the filter cartridge outlet extends across only an upper portion of an opposite side of the filter cartridge.