# US 10,455,733 B2 · Liquid cooling system and method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,455,733 B2 - Document ID: US10455733B2 - Status: Granted - Kind: B2 - Application number: 16/306,045 - Filed: 2016-06-01 - Published: 2019-05-02 - Granted: 2019-10-22 - Earliest claimed: 2016-06-01 - Assignees: ABB Schweiz AG - Applicants: ABB Schweiz AG - Inventors: Irene Gardoni; Manfred Kipfer; Erika De-Candido - Web page: https://patentgrep.com/patent/US10455733B2 ## CPC - 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 7/20218: {using a liquid coolant without phase change in electronic enclosures (in cabinets of standardized dimensions H05K7/20536; in server cabinets H05K7/20709; in vehicle electronic casings H05K7/20845; in power control electronics H05K7/2089; in displays H05K7/20954)} - H05K 7/20627: {Liquid coolant without phase change} - H05K 7/20763: {Liquid cooling without phase change} - H05K 7/20872: {Liquid coolant without phase change} - H05K 7/20927: {Liquid coolant without phase change} - F01P 11/028: {Deaeration devices} - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - F01P: COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES (arrangements in connection with cooling of propulsion units in vehicles B60K11/00; heat-transfer, heat-exchange or heat-storage materials C09K5/00; {cooling of gas-turbine engines F02C7/12}; heat exchange in general, radiators F28) ## Abstract A liquid cooling system for cooling an electrical component, the liquid cooling system including a cooling circuit having at least one supply branch for supplying liquid coolant to an electrical component; and a de-aeration line to provide a connection between a high point and a junction point of the cooling circuit to bypass a part of the cooling circuit; wherein the pressure of the liquid coolant is lower in the junction point than in the high point during circulation of the liquid coolant in the liquid cooling system. ## Claims ### Claim 1 A liquid cooling system for cooling at least one electrical component, the liquid cooling system comprising: a cooling circuit having an inlet flow line, a return flow line, and at least one supply branch for supplying liquid coolant to an electrical component; and at least one de-aeration line to provide a connection between a high point and a junction point of the cooling circuit to bypass a part of the cooling circuit; wherein the high point constitutes a geodetically or locally highest point of the at least one supply branch; wherein the junction point is provided on the return flow line downstream of the at least one supply branch; wherein the pressure of the liquid coolant is lower in the junction point than in the high point during circulation of the liquid coolant in the liquid cooling system. ### Claim 2 (depends on 1) The liquid cooling system according to claim 1, wherein the high point constitutes a geodetically highest point of the at least one supply branch. ### Claim 3 (depends on 1) The liquid cooling system according to claim 1, wherein the junction point is geodetically above the high point. ### Claim 4 (depends on 2) The liquid cooling system according to claim 2, wherein the at least one supply branch provides a connection between the inlet flow line and the return flow line. ### Claim 5 (depends on 2) The liquid cooling system according to claim 2, further including at least one electrical component to be cooled. ### Claim 6 (depends on 1) The liquid cooling system according to claim 1, wherein the junction point is geodetically below the high point. ### Claim 7 (depends on 1) The liquid cooling system according to claim 1, wherein the liquid cooling system includes: a plurality of supply branches for supplying liquid coolant to a plurality of electrical components; and at least one de-aeration line to provide a connection between each high point of the supply branches and at least one junction point of the cooling circuit; wherein the pressure of the liquid coolant is lower in the at least one junction point than in the respective high point connected to the junction point by means of the de-aeration line. ### Claim 8 (depends on 7) The liquid cooling system according to claim 7, wherein the at least one junction point is geodetically below the respective high point connected to the junction point by means of the de-aeration line. ### Claim 9 (depends on 8) The liquid cooling system according to claim 8, wherein the at least one de-aeration line provides a connection between each high point of the supply branches and one single junction point of the cooling circuit. ### Claim 10 (depends on 7) The liquid cooling system according to claim 7, wherein the at least one de-aeration line provides a connection between each high point of the supply branches and one single junction point of the cooling circuit. ### Claim 11 (depends on 1) The liquid cooling system according to claim 1, wherein the at least one supply branch provides a connection between the inlet flow line and the return flow line. ### Claim 12 (depends on 11) The liquid cooling system according to claim 11, wherein the inlet flow line is located geodetically below the at least one electrical component. ### Claim 13 (depends on 1) The liquid cooling system according to claim 1, further including at least one electrical component to be cooled. ### Claim 14 (depends on 13) The liquid cooling system according to claim 13, wherein the inlet flow line is located geodetically below the at least one electrical component. ### Claim 15 (depends on 1) The liquid cooling system according to claim 1, wherein the at least one high point constitutes a locally highest point of the at least one supply branch. ### Claim 16 (depends on 1) The liquid cooling system according to claim 1, further including a valve for closing the de-aeration line. ### Claim 17 A method of operating a liquid cooling system for cooling at least one electrical component, the method comprising the steps of: circulating liquid coolant in a cooling circuit having an inlet flow line, a return flow line, and at least one supply branch for supplying liquid coolant to an electrical component; and connecting at least one high point and a junction point of the cooling circuit to bypass a part of the cooling circuit; wherein the high point constitutes a geodetically or locally highest point of the at least one supply branch; wherein the junction point is provided on the return flow line downstream of the at least one supply branch; wherein the pressure of the liquid coolant is lower in the junction point than in the high point.