# US 10,864,470 B2 · Indoor unit for air-conditioning apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,864,470 B2 - Document ID: US10864470B2 - Status: Granted - Kind: B2 - Application number: 15/538,098 - Filed: 2015-03-27 - Published: 2018-01-11 - Granted: 2020-12-15 - Earliest claimed: 2015-03-27 - Assignees: Mitsubishi Electric Corporation - Applicants: Mitsubishi Electric Corporation - Inventors: Masayuki Oishi; Shuhei Yokota - Web page: https://patentgrep.com/patent/US10864470B2 ## CPC - F24F 1/0059: characterised by heat exchangers - B01D 46/0006: {Filter elements or cartridges installed in a drawer-like manner} - B01D 46/0041: {for feeding} - B01D 46/12: in multiple arrangements - B01D 46/18: Particle separators, e.g. dust precipitators, using filtering belts - B01D 46/4227: {Manipulating filters or filter elements, e.g. handles or extracting tools} - B01D 46/681: by scrapers, brushes or the like - F24F 8/108: using dry filter elements - F24F 8/90: Cleaning of purification apparatus - F24F 13/20: Casings or covers - F24F 13/28: Arrangement or mounting of filters - B01D 2267/70: Horizontal arrangement - B01D 2273/14: Filters which are moved between two or more positions, e.g. by turning, pushing - B01D 2279/50: for air conditioning - F24F 1/00: Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station - F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02) - 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) ## Abstract An indoor unit for an air-conditioning apparatus includes a cartridge provided to an air inlet so as to be freely mountable and dismountable. The cartridge accommodates a filter so as to be freely movable in a right-and-left direction and has an opening port formed in one end portion in the right-and-left direction. A dust box is provided on a side of the end portion of the cartridge. The dust box includes a cleaning mechanism configured to clean the filter and a dust collecting portion configured to collect dust. ## Claims ### Claim 1 An indoor unit for an air-conditioning apparatus, comprising: a casing having an air inlet formed in an upper surface of the casing and an air outlet formed below the air inlet; a fan and a heat exchanger provided inside the casing; at least one filter provided to the air inlet and configured to remove dust from air sucked into the casing by the fan; at least one cartridge provided to the air inlet so as to be freely mountable and dismountable, the at least one cartridge having a ventilation port formed in an upper surface of the at least one cartridge, a ventilation port formed in a lower surface of the cartridge, and a filter drive shaft configured to move the at least one filter, the at least one cartridge being configured to accommodate the at least one filter so that the at least one filter is freely mountable and dismountable; a filter drive motor configured to drive the filter drive shaft; a dust box comprising: a brush configured to clean the at least one filter; a brush drive shaft, to which the brush is mounted, the brush drive shaft being configured to rotate or swing the brush; and a dust collecting portion configured to collect the dust removed by the brush; and a brush drive motor configured to drive the brush drive shaft, the at least one cartridge having an opening port formed in one end portion of the at least one cartridge in a right-and-left direction and being configured to move the at least one filter in the right-and-left direction, the dust box being provided to be opposed to the opening port of the at least one cartridge so as to be freely mountable and dismountable by sliding in the fore-and-aft direction and being configured to clean the at least one filter from the opening port by the brush. ### Claim 2 (depends on 1) The indoor unit for an air-conditioning apparatus of claim 1, wherein: the fan comprises at least one axial flow fan provided below the air inlet; and the heat exchanger is provided at a position located on a downstream side of the at least one axial flow fan and on an upstream side of the air outlet. ### Claim 3 (depends on 2) The indoor unit for an air-conditioning apparatus of claim 2, wherein: the at least one filter comprises a plurality of filters; the at least one cartridge comprises a plurality of cartridges; the at least one axial flow fan comprises a plurality of axial flow fans; the plurality of cartridges are arranged side by side in the right-and-left direction; the plurality of axial flow fans are arranged side by side in the right-and-left direction; two of the plurality of cartridges respectively have the opening ports formed in opposed end portions of the two of the plurality of cartridges in the right-and-left direction; the dust box is provided on a side of the opposed end portions so that two of the plurality of filters are cleaned by the single dust box; and the dust box provided on the side of the opposed end portions is arranged between adjacent axial flow fans among the plurality of axial flow fans in plan view. ### Claim 4 (depends on 1) The indoor unit for an air-conditioning apparatus of claim 1, wherein the at least one filter is configured to be moved toward an end portion on a side where the dust box is arranged and to be reversed at the end portion. ### Claim 5 (depends on 1) The indoor unit for an air-conditioning apparatus of claim 1, wherein the filter drive motor is arranged behind the dust box. ### Claim 6 (depends on 1) The indoor unit for an air-conditioning apparatus of claim 1, wherein: the at least one cartridge comprises: an upper frame forming the upper surface of the at least one cartridge; a lower frame forming the lower surface of the at least one cartridge; and an intermediate frame provided between the upper frame and the lower frame; and an upper traveling path for the at least one filter is formed between the upper frame and the intermediate frame, and a lower traveling path for the at least one filter is formed between the intermediate frame and the lower frame. ### Claim 7 (depends on 1) The indoor unit for an air-conditioning apparatus of claim 1, wherein: the casing comprises a placement portion on which the at least one cartridge is to be placed; the at least one cartridge comprises: an upper frame forming the upper surface of the at least one cartridge; and a lower frame forming the lower surface of the at least one cartridge; and an upper traveling path for the at least one filter is formed between the upper frame and the lower frame, and a lower traveling path for the at least one filter is formed between the lower frame and the placement portion. ### Claim 8 (depends on 6) The indoor unit for an air-conditioning apparatus of claim 6, wherein the at least one filter is configured to be located in the upper traveling path in an operating state and to be moved, during cleaning, toward an end portion on a side where the dust box is arranged and reversed at the end portion so as to be moved into the lower traveling path. ### Claim 9 (depends on 1) The indoor unit for an air-conditioning apparatus of claim 1, wherein the dust box and the at least one cartridge are provided so as to be mountable and dismountable independently of each other. ### Claim 10 (depends on 9) The indoor unit for an air-conditioning apparatus of claim 9, wherein: the at least one cartridge is configured to be freely mountable into and dismountable from the casing in a fore-and-aft direction; and the dust box comprises a guiding portion formed on a side surface of the dust box opposed to the casing and configured to guide the at least one cartridge to a regular mounting position in a state in which the dust box is mounted into the casing. ### Claim 11 (depends on 10) The indoor unit for an air-conditioning apparatus of claim 10, wherein: the casing comprises a guide groove configured to guide the at least one cartridge to the regular mounting position, the guide groove being provided at a position opposed to an end portion of the at least one cartridge in the right-and-left direction on a side where the dust box is not provided; the guide groove is formed along the fore-and-aft direction; the at least one cartridge comprises a convex portion formed at a position opposed to the guide groove; and the guide groove is formed so that a width thereof in the right-and-left direction increases from a rear side to a front side.