# US 11,111,024 B2 · Foldable RAM air inlet filter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,111,024 B2 - Document ID: US11111024B2 - Status: Granted - Kind: B2 - Application number: 15/869,638 - Filed: 2018-01-12 - Published: 2019-07-18 - Granted: 2021-09-07 - Earliest claimed: 2018-01-12 - Assignees: Honeywell International Inc. - Applicants: Honeywell International Inc. - Inventors: Feng Xie; Yao Li; Xiaolei Fu - Web page: https://patentgrep.com/patent/US11111024B2 ## CPC - B64D 13/06: the air being conditioned (pressurising B64D13/02) - B01D 45/08: by impingement against baffle separators - B01D 46/0016: {Folded frame or housing constructions} - B01D 46/0027: {with additional separating or treating functions} - B01D 46/0041: {for feeding} - B64D 33/02: of combustion air intakes - F02C 7/042: having variable geometry - F02C 7/052: with dust-separation devices - B64D 2013/0618: {with arrangements for reducing or managing bleed air, using another air source, e.g. ram air} - B64D 2013/0651: {comprising filters, e.g. dust filters} - B64D 2033/022: {comprising bird or foreign object protections} - B64D 2033/0246: {comprising particle separators} - Y02T 50/50: On board measures aiming to increase energy efficiency - B64D: EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT - 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) - F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A filtering assembly that receives an inlet air includes a modulation panel subassembly, an air filter subassembly downstream of the modulation panel subassembly, wherein the air filter subassembly is configured to discharge the inlet air from the filtering assembly, and an arm subassembly configured to move the modulation panel subassembly and to move the air filter subassembly. The air filter subassembly moves into and out of a flow of the inlet air. ## Claims ### Claim 1 A filtering assembly configured to receive an inlet air, the assembly comprising: a modulation panel subassembly positioned at an air inlet side of the filtering assembly, wherein the filtering assembly further comprises an air outlet side at which the filtering assembly is configured to discharge the inlet air into an air duct, wherein an air flow path extends from the air inlet side to the air outlet side; an air filter subassembly downstream of the modulation panel subassembly and positioned at the air outlet side, wherein the air filter subassembly is configured to discharge the inlet air from the filtering assembly; and an arm subassembly configured to move the modulation panel subassembly and to move the air filter subassembly, whereby the air filter subassembly moves into and out of a flow of the inlet air through the air flow path. ### Claim 2 (depends on 1) The assembly of claim 1, further comprising an actuator directly connected to the arm subassembly and configured to actuate movement of the arm subassembly to move the modulation panel subassembly and the air filter subassembly. ### Claim 3 (depends on 1) The assembly of claim 1, further comprising an actuator indirectly connected to the air filter subassembly and configured to actuate movement of the arm subassembly to move the modulation panel subassembly and the air filter subassembly. ### Claim 4 (depends on 1) The assembly claim 1, wherein the modulation panel subassembly is configured to articulate to move into and out of the flow of inlet air to change a size of a cross-section of an air inlet into the air duct. ### Claim 5 (depends on 1) The assembly of claim 1, wherein the assembly is configured to direct the inlet air to a component downstream of the assembly, wherein the component is susceptible to damage from particulates in the inlet air. ### Claim 6 (depends on 1) The assembly of claim 1, wherein the air filter subassembly is configured to move between a folded position and an extended position to move into and out of the flow of the inlet air through the air flow path. ### Claim 7 (depends on 1) The assembly of claim 1, wherein the arm subassembly is configured to move the air filter subassembly by at least rotating the air filter subassembly towards an upstream side of the filter assembly and into a folded position. ### Claim 8 (depends on 1) The assembly of claim 1, wherein the modulation panel subassembly comprises an upstream modulation panel and a downstream modulation panel positioned in an end-to-end relationship. ### Claim 9 (depends on 8) The assembly of claim 8, wherein the upstream modulation panel and the downstream modulation panel are configured to articulate about a hinge between the upstream modulation panel and the downstream modulation panel to change a size of a cross-section of an air inlet into the air duct. ### Claim 10 A filtering assembly configured to receive an inlet air, the assembly comprising: a modulation panel subassembly positioned at an air inlet side of the filtering assembly, wherein the modulation panel subassembly comprises an upstream modulation panel and a downstream modulation panel, wherein the upstream and downstream modulation panels are configured to articulate with one another to move the modulation panel subassembly into and out of a flow of the inlet air; an air filter subassembly positioned downstream of the modulation panel subassembly and at an air outlet side of the filtering assembly; an actuator upstream of the air filter subassembly; and an arm subassembly configured to, via the actuator, move the modulation panel subassembly to move the upstream and downstream modulation panels into and out of the flow of the inlet air, and to move the air filter subassembly into and out of the flow of the inlet air. ### Claim 11 (depends on 10) The assembly of claim 10, wherein the actuator is connected to the arm subassembly and is configured to actuate movement of the arm subassembly to move the air filter subassembly between a folded position and an extended position. ### Claim 12 (depends on 10) The assembly of claim 10, wherein the actuator is connected to the air filter subassembly and is configured to actuate movement of the air filter assembly to move the air filter subassembly between a folded position and an extended position. ### Claim 13 (depends on 10) The assembly of claim 10, wherein the modulation panel subassembly is configured to move between a folded position and an extended position to move the upstream panel and the downstream panel into and out of the flow of inlet air to change a size of a cross-section of an air inlet configured to receive the inlet air. ### Claim 14 (depends on 10) The assembly of claim 10, wherein the arm subassembly is configured to move the air filter subassembly by at least rotating the air filter subassembly towards an upstream side of the filter assembly and into a folded position. ### Claim 15 (depends on 10) The assembly of claim 10, wherein the upstream modulation panel and the downstream modulation panel are configured to articulate relative to each other about a hinge between the upstream modulation panel and the downstream modulation panel. ### Claim 16 (depends on 10) The assembly of claim 10, wherein the arm subassembly is connected to the modulation panel subassembly and configured to move the upstream panel and the downstream panel into and out of the flow of inlet air to change a size of a cross-section of an air inlet configured to receive the inlet air. ### Claim 17 (depends on 10) The assembly of claim 10 wherein the modulation panel subassembly is configured to move concurrently with movement of the air filter subassembly. ### Claim 18 A filtering assembly configured to receive an inlet air, the assembly comprising: a modulation panel subassembly positioned at an air inlet side of the filtering assembly and configured to change a size of a cross-section of an air inlet configured to receive the inlet air; and an air filter subassembly positioned downstream of the modulation panel subassembly and at an air outlet side of the filtering assembly, wherein the modulation panel subassembly and the air filter subassembly are configured to concurrently move with one another. ### Claim 19 (depends on 18) The assembly of claim 18, further comprising: an arm subassembly configured to actuate movement of the modulation panel subassembly and the air filter subassembly; and an actuator configured to control the arm subassembly to actuate the movement of the modulation panel subassembly and the air filter subassembly. ### Claim 20 (depends on 18) The assembly of claim 18, wherein: the inlet air is a RAM air; and the assembly is configured to be upstream of a heat exchanger of an environmental control system of an aircraft.