# US 9,883,608 B2 · Cooling device for cooling a switchgear cabinet > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,883,608 B2 - Document ID: US9883608B2 - Status: Granted - Kind: B2 - Application number: 13/261,974 - Filed: 2013-02-08 - Published: 2015-06-04 - Granted: 2018-01-30 - Earliest claimed: 2012-04-19 - Assignees: Rittal GmbH & Co. KG - Applicants: Rittal GmbH & Co. KG - Inventors: Michael Nicolai; Martin Doerrich; Dieter Becker; Andreas Meyer - Web page: https://patentgrep.com/patent/US9883608B2 ## CPC - H05K 7/20145: {Means for directing air flow, e.g. ducts, deflectors, plenum or guides} - H05K 7/20172: {Fan mounting or fan specifications} - H05K 7/202: {Air circulating in closed loop within enclosure wherein heat is removed through heat-exchangers} - H05K 7/20572: {within cabinets for removing heat from sub-racks, e.g. plenum} - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ## Abstract The invention relates to a cooling device for cooling of a switchgear cabinet, comprising an air inlet side for warm air and an air outlet side for cooled air, wherein a heat exchanger and at least one fan unit having a radial fan are located between the air inlet side and the air outlet side, and wherein the fan unit creates an air stream through the heat exchanger having a main flow direction between the air inlet side and the air outlet side, wherein the fan unit is located in the main flow direction behind the heat exchanger, characterized in that the fan unit comprises an air guide geometry, so that air exhausted from the radial fan is redirected into the main flow direction. ## Claims ### Claim 1 A cooling device for cooling of a switchgear cabinet, comprising an air inlet side for warm air and an air outlet side for cooled air, wherein a heat exchanger and at least one fan unit having a radial fan are located between the air inlet side and the air outlet side, and wherein the fan unit creates an air stream through the heat exchanger having a main flow direction between the air inlet side and the air outlet side, wherein the fan unit is located in the main flow direction behind the heat exchanger, and wherein the fan unit comprises an intake and an ashlar-shaped fan box in which the radial fan is received, wherein the fan box comprises an air outlet at at least one of four sides oriented parallel with respect to the main flow direction and parallel with respect to a rotational axis of the radial fan, characterized in that the fan unit comprises an air guide geometry, which air guide geometry comprises an end section that is connected to and extends perpendicularly from a side of the fan box to a 90°-curvature, so that air exhausted from the radial fan is redirected into the main flow direction, and wherein a separative element extends from the side of the fan box, and the end section of the air guide geometry and the separative element extend the same height from the side of the fan box, the cooling device further comprising a plurality of fan units, wherein adjacent fan units are arranged in such a way with respect to each other that they adjoin to each other at least in sections along their respective air guide geometry, and wherein each fan unit comprises an intake, and wherein at adjacent fan units the corresponding separative element that extends between opposing sides of the adjacent fan units guides air exhausted from the air outlets of the adjacent fan units away from the intakes of the adjacent fan units. ### Claim 2 (depends on 1) The cooling device according to claim 1, wherein the air guide geometry adjoins to the air outlet or the air outlets of the fan box, and guides air exhausted from the air outlet or the air outlets away from the intake of the fan unit. ### Claim 3 (depends on 1) The cooling device according to claim 1, wherein the air guide geometry is formed as a funnel that surrounds the four sides oriented parallel with respect to the main flow direction or is formed as a partial funnel that surrounds at least one of the four sides that are oriented parallel with respect to the main flow direction. ### Claim 4 (depends on 1) The cooling device according to claim 1, comprising a rack, wherein the rack comprises at the air outlet side a mounting opening having a horizontal width that is smaller than a horizontal width of the fan units or that is equal to the horizontal width of the fan units, wherein the fan units are mounted on the rack in vertical direction one above the other, and wherein the separative element extends over the entire horizontal width of the cooling device. ### Claim 5 (depends on 1) The cooling device according to claim 1, wherein the radial fan is a radial fan comprising backward curved blades. ### Claim 6 (depends on 1) The cooling device according to claim 1, wherein the plurality of fan units form a fan assembly with a suction side and an exhaust side, and the fans in the fan assembly are stacked one above the other so that the suction side of the fan assembly is fluidically separated from the exhaust side. ### Claim 7 (depends on 6) The cooling device according to claim 6, wherein the end sections of adjacent 90° bent air guide geometries that are placed at the same height as free ends of the separative elements are configured to be stacked one above the other. ### Claim 8 A cooling device for cooling of a switchgear cabinet, comprising an air inlet side for warm air and an air outlet side for cooled air, wherein a heat exchanger and at least one fan unit having a radial fan are located between the air inlet side and the air outlet side, and wherein the fan unit creates an air stream through the heat exchanger having a main flow direction between the air inlet side and the air outlet side, wherein the fan unit is located in the main flow direction behind the heat exchanger, and wherein the fan unit comprises an intake and an ashlar-shaped fan box in which the radial fan is received, wherein the fan box comprises an air outlet at at least one of four sides oriented parallel with respect to the main flow direction and parallel with respect to a rotational axis of the radial fan, characterized in that the fan unit comprises an air guide geometry, which air guide geometry comprises an end section that is connected to and extends perpendicularly from a side of the fan box to a 90°-curvature, so that air exhausted from the radial fan is redirected into the main flow direction, and wherein a separative element extends from the side of the fan box, and the end section of the air guide geometry and the separative element extend the same height from the side of the fan box, wherein the cooling device further comprises a plurality of fan units, wherein adjacent fan units are arranged in such a way with respect to each other that they adjoin to each other at least in sections along their respective air guide geometry, and wherein the plurality of fans form a fan assembly with a suction side and an exhaust side, and the fans in the fan assembly are stacked one above the other so that the suction side of the fan assembly is fluidically separated from the exhaust side, and wherein the end sections of adjacent 90° bent air guide geometries that are placed at the same height as free ends of the separative elements are configured to be stacked one above the other; and wherein the end sections of adjacent 90° bent air guide geometries that are placed at the same height as the free ends of the separative elements are configured to be form-locking to one another. ### Claim 9 A cooling device for cooling of a switchgear cabinet, comprising an air inlet side for warm air and an air outlet side for cooled air, wherein a heat exchanger and at least one fan unit having a radial fan are located between the air inlet side and the air outlet side, and wherein the fan unit creates an air stream through the heat exchanger having a main flow direction between the air inlet side and the air outlet side, wherein the fan unit is located in the main flow direction behind the heat exchanger, and wherein the fan unit comprises an intake and an ashlar-shaped fan box in which the radial fan is received, wherein the fan box comprises an air outlet at at least one of four sides oriented parallel with respect to the main flow direction and parallel with respect to a rotational axis of the radial fan, characterized in that the fan unit comprises an air guide geometry, which air guide geometry comprises an end section that is connected to and extends perpendicularly from a side of the fan box to a 90°-curvature, so that air exhausted from the radial fan is redirected into the main flow direction, and wherein a separative element extends from the side of the fan box, and the end section of the air guide geometry and the separative element extend the same height from the side of the fan box, and wherein the at least one fan unit comprises a plurality of fan units, each with an end sections of 90° bent air guide geometries that are configured to be form-locking to one another. ### Claim 10 (depends on 9) The cooling device according to claim 9, wherein adjacent fan units of the plurality of fan units are arranged in such a way with respect to each other that they adjoin to each other at least in sections along their respective air guide geometry.