# US 11,112,840 B2 · Electronics chassis with oscillating heat pipe (OHP) > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,112,840 B2 - Document ID: US11112840B2 - Status: Granted - Kind: B2 - Application number: 16/548,284 - Filed: 2019-08-22 - Published: 2021-02-25 - Granted: 2021-09-07 - Earliest claimed: 2019-08-22 - Assignees: Abaco Systems, Inc. - Applicants: Abaco Systems, Inc. - Inventors: Joo Han Kim; Jonathan Anderson; Brian Hoden - Web page: https://patentgrep.com/patent/US11112840B2 ## CPC - G06F 1/20: Cooling means - H05K 7/20681: {within cabinets for removing heat from sub-racks} - H05K 7/20336: {Heat pipes, e.g. wicks or capillary pumps} - H05K 7/2039: {characterised by the heat transfer by conduction from the heat generating element to a dissipating body (arrangements for increasing/decreasing heat-transfer, e.g. fins details, F28F13/00)} - F28D 15/0275: {Arrangements for coupling heat-pipes together or with other structures, e.g. with base blocks; Heat pipe cores} - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general) ## Abstract An electronic chassis for enclosing and cooling electronic equipment is described that includes an oscillating heat pipe (OHP), wherein a first portion of the OHP extends into a rail of the chassis and a second portion of the OHP extends into the side panel on which the rail is located so that at least a portion of heat from operation of electronic equipment on a circuit card assembly (CCA) in contact with the rail passes through the rail to the OHP and from the OHP to a side panel of the chassis on which the rail is located where it is dissipated into an environment. In some instances, the side panel includes cooling fins. Also described is a method for forming such a chassis substantially of metal such as aluminum or its alloys using 3D printing or additive manufacturing. ## Claims ### Claim 1 A chassis for enclosing and cooling electronic equipment, said chassis comprising: a top, a bottom, and two side panels that define an interior space, wherein each side panel has an interior side, an exterior side, a length and a height; at least one rail located on the interior side of at least one of the side panels, wherein the rail extends inwardly toward the interior space and horizontally along the length of the interior side of the side panel, wherein the rail is configured to contact only a portion of a circuit card assembly comprising electronic equipment; and an oscillating heat pipe (OHP), wherein a first portion of the OHP extends inwardly through the rail toward the interior space and is fully enveloped by the at least one rail, and extends toward the exterior side of the at least one of the side panels and into the at least one of the side panels, and a second portion of the OHP orthogonal to the first portion extends into the height of and is fully enveloped by the at least one side panel on which the rail is located, wherein at least a portion of heat from operation of the electronic equipment passes through the circuit card assembly to the at least one rail, and from the at least one rail to the first portion of the OHP, from the first portion of the OHP to the second portion of the OHP, and from the second portion of the OHP to the at least one side panel on which the rail is located where it is dissipated into an environment. ### Claim 2 (depends on 1) The chassis of claim 1, wherein the chassis further comprises a cold plate, and wherein at least a portion of the OHP extends into the cold plate. ### Claim 3 (depends on 1) The chassis of claim 1, wherein the chassis further comprises a front panel, and a back panel. ### Claim 4 (depends on 1) The chassis of claim 1, wherein the portion of the circuit card assembly in contact with the rail comprises a portion of a frame of the circuit card assembly. ### Claim 5 (depends on 1) The chassis of claim 1, wherein the exterior of the at least one side panel further comprises one or more fins for cooling. ### Claim 6 (depends on 5) The chassis of claim 5, wherein a first U-shaped end of the first portion of the OHP is proximate to an inside edge or a top of the at least one rail and a second U-shaped end of the second portion of the OHP is proximate to the exterior of the at least one side panel or the at least one or more fins for cooling. ### Claim 7 (depends on 1) The chassis of claim 1, wherein the first portion of the OHP comprises an evaporator section of the OHP and the second portion of the OHP comprises a condenser section of the OHP. ### Claim 8 (depends on 1) The chassis of claim 1, wherein at least a portion of the chassis is formed by three-dimensional (3D) printing or additive manufacturing. ### Claim 9 (depends on 1) The chassis of claim 1 wherein the OHP comprises a channel in the rail and the side panel, and the channel is formed by 3D printing or additive manufacturing. ### Claim 10 (depends on 1) The chassis of claim 1, wherein the chassis is substantially formed of aluminum, titanium, copper, or their alloys. ### Claim 11 A method of forming a chassis for enclosing and cooling electronic equipment using three-dimensional (3D) printing or additive manufacturing, said method comprising: forming, by a 3D printer, a top, a bottom, and two side panels that define an interior space, wherein each side panel has an interior side and an exterior side, a length and a height; forming, by the 3D printer, at least one rail located on the interior side of at least one of the side panels, wherein the rail extends inwardly toward the interior space and horizontally along the length of the interior side of the side panel, wherein the rail is configured to contact only a portion of a circuit card assembly comprising electronic equipment; and forming, by the 3D printer, an oscillating heat pipe (OHP), wherein a first portion of the OHP extends inwardly through the rail toward the interior space and is fully enveloped by the at least one rail, and extends toward the exterior side of the at least one of the side panels and into the at least one of the side panels, and a second portion of the OHP orthogonal to the first portion extends into the height of and is fully enveloped by the at least one side panel on which the rail is located, wherein at least a portion of heat from operation of the electronic equipment passes through the circuit card assembly to the at least one rail, and from the at least one rail to the first portion of the OHP, from the first portion of the OHP to the second portion of the OHP, and from the second portion of the OHP to the that at least one side panel on which the rail is located where it is dissipated into an environment. ### Claim 12 (depends on 11) The method of claim 11, further comprising forming, by the 3D printer, a front panel, and a back panel for the chassis. ### Claim 13 (depends on 11) The method of claim 11, further comprising forming, by the 3D printer, one or more cooling fins on the exterior of the at least one side panel. ### Claim 14 (depends on 13) The method of claim 13, wherein a first U-shaped end of the first portion of the OHP is formed by the 3D printer proximate to an inside edge or a top of the at least one rail and a second U-shaped end of the second portion of the OHP is formed by the 3D printer proximate to the exterior of the at least one side panel or the at least one or more fins for cooling. ### Claim 15 (depends on 11) The method of claim 11, wherein the first portion of the OHP comprises an evaporator section of the OHP and the second portion of the OHP comprises a condenser section of the OHP. ### Claim 16 (depends on 11) The method of claim 11, wherein the chassis is substantially formed of aluminum, titanium, copper, or their alloys by the 3D printer. ### Claim 17 A system for enclosing and cooling electronic equipment, said system comprising: one or more circuit card assemblies (CCAs), each CCA comprising electronic equipment and a frame; and a chassis for enclosing and cooling the one or more CCAs during their operation, said chassis comprising: a top panel, a bottom panel, a front panel, a back panel, and two side panels that define an interior space, each side panel having an interior, an exterior, a length and a height, wherein the exterior of at least one of the side panels further comprises one or more fins for cooling; a plurality of rails located on the interior of each of the two side panels, wherein each rail extends inwardly toward the interior space and horizontally along the length of the interior side of the side panel, wherein each rail is configured to contact only a portion of the frame of each of the one or more CCAs, wherein the two side panels are parallel to one another; and an oscillating heat pipe (OHP), wherein an evaporator section of the OHP extends inwardly through the rail toward the interior space and is fully enveloped by at least one of the plurality of rails, and extends toward the exterior side of the at least one of the side panels and into the at least one of the side panels, and a condenser section of the OHP orthogonal to the evaporator section extends into the height of and is fully enveloped by the side panel on which the rail is located, wherein a first U-shaped end of the evaporator portion of the OHP is proximate to an inside edge or a top of the at least one rail and a second U-shaped end of the condenser section is proximate to the exterior of the at least one side panel or the at least one or more fins for cooling, wherein at least a portion of heat from operation of the electronic equipment passes through the one or more CCAs to the frame of the CCA, from the frame of the CCA to the rail, and from the rail to the evaporator section of the OHP, from the evaporator section of the OHP to the condenser section of the OHP, and from the condenser section of the OHP to the that side panel on which the rail is located where it is dissipated into an environment. ### Claim 18 (depends on 17) The system of claim 17, further comprising a cold plate, wherein at least a portion of the OHP extends into the cold plate. ### Claim 19 (depends on 18) The system of claim 18, wherein the OHP is formed by 3D printing or additive manufacturing. ### Claim 20 (depends on 17) The system of claim 17, wherein at least a portion of the chassis is formed by three-dimensional (3D) printing or additive manufacturing. ### Claim 21 (depends on 17) The system of claim 17, wherein the chassis is substantially formed of aluminum, titanium, copper, or their alloys.