# US 12,006,953 B2 · Blower with silencer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,006,953 B2 - Document ID: US12006953B2 - Status: Granted - Kind: B2 - Application number: 17/886,556 - Filed: 2022-08-12 - Published: 2022-12-08 - Granted: 2024-06-11 - Earliest claimed: 2020-03-26 - Assignees: FUJIFILM Corporation - Applicants: FUJIFILM Corporation - Inventors: Shinya Hakuta; Shogo Yamazoe; Yoshihiro Sugawara; Akihiko Ohtsu - Web page: https://patentgrep.com/patent/US12006953B2 ## CPC - F04D 29/665: {by means of resonance chambers or interference} - F04D 19/002: {Axial flow fans} - F04D 25/0613: {the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator} - F04D 29/542: {Bladed diffusers (fixing blades to stators F01D9/042)} - G10K 11/16: Methods or devices for protecting against, or for damping, noise or other acoustic waves in general (G10K11/36 takes precedence) - G10K 11/172: using resonance effects - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - G10K: SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR ## Abstract An axial fan that includes a casing having an inner space that penetrates in one direction, and a rotor blade disposed in the inner space of the casing, and a silencer that is disposed at a position connected to the inner space of the axial fan are provided, in which the axial fan has a sound pressure distribution having a position at which a sound pressure is high and a position at which the sound pressure is low in a circumferential direction in the inner space during driving, and the silencer is disposed at the position of the axial fan in the circumferential direction at which the sound pressure is high and is not disposed at the position at which the sound pressure is low. ## Claims ### Claim 1 A blower with a silencer, the blower comprising: an axial fan that includes a casing having an inner space that penetrates in one direction, and a rotor blade disposed in the inner space of the casing; and a silencer that is disposed at a position connected to the inner space of the axial fan, wherein the axial fan has a plurality of fixed blades, the axial fan has a sound pressure distribution having, in a plurality of fixed blade opening portions which are each formed between the adjacent fixed blades, a position at which a sound pressure is high and a position at which the sound pressure is low in a circumferential direction in the inner space during driving, the silencer is connected to the position at which the sound pressure is high and is not connected to the position at which the sound pressure is low in the sound pressure distribution within at least one of the plurality of fixed blade opening portions, and the silencer is not disposed at the position at which the sound pressure is low in all of the plurality of fixed blade opening portions. ### Claim 2 (depends on 1) The blower with a silencer according to claim 1, wherein the silencer is a resonator. ### Claim 3 (depends on 2) The blower with a silencer according to claim 2, wherein the resonator has a flow passage communicating with the inner space of the axial fan. ### Claim 4 (depends on 2) The blower with a silencer according to claim 2, wherein, in a case in which a resonance frequency of the resonator is denoted by f0 and at least one frequency of a discrete frequency sound caused by the rotor blade of the axial fan is denoted by fn, the resonance frequency f0 of the resonator is in a range of 0.8×fn to 1.1×fn. ### Claim 5 (depends on 3) The blower with a silencer according to claim 3, wherein, in a case in which a resonance frequency of the resonator is denoted by f0 and at least one frequency of a discrete frequency sound caused by the rotor blade of the axial fan is denoted by fn, the resonance frequency f0 of the resonator is in a range of 0.8×fn to 1.1×fn. ### Claim 6 (depends on 4) The blower with a silencer according to claim 4, wherein, in a case in which the resonance frequency of the resonator is denoted by f0 and at least one frequency of the discrete frequency sound caused by the rotor blade of the axial fan is denoted by fn, the resonance frequency f0 of the resonator is in a range of 0.9×fn to 0.95×fn. ### Claim 7 (depends on 5) The blower with a silencer according to claim 5, wherein, in a case in which the resonance frequency of the resonator is denoted by f0 and at least one frequency of the discrete frequency sound caused by the rotor blade of the axial fan is denoted by fn, the resonance frequency f0 of the resonator is in a range of 0.9×fn to 0.95×fn. ### Claim 8 (depends on 4) The blower with a silencer according to claim 4, wherein the resonator having the resonance frequency f0 in the range of 0.8×fn to 1.1×fn with respect to each of two or more discrete frequency sounds is provided. ### Claim 9 (depends on 5) The blower with a silencer according to claim 5, wherein the resonator having the resonance frequency f0 in the range of 0.8×fn to 1.1×fn with respect to each of two or more discrete frequency sounds is provided. ### Claim 10 (depends on 6) The blower with a silencer according to claim 6, wherein the resonator having the resonance frequency f0 in the range of 0.8×fn to 1.1×fn with respect to each of two or more discrete frequency sounds is provided. ### Claim 11 (depends on 7) The blower with a silencer according to claim 7, wherein the resonator having the resonance frequency f0 in the range of 0.8×fn to 1.1×fn with respect to each of two or more discrete frequency sounds is provided. ### Claim 12 (depends on 1) The blower with a silencer according to claim 1, wherein the silencer is disposed at a position that does not overlap with a region formed by rotation of the rotor blade as viewed from an axial direction of the axial fan. ### Claim 13 (depends on 1) The blower with a silencer according to claim 1, wherein the silencer is disposed at each of two or more positions at which the sound pressure is high in the sound pressure distribution of at least one discrete frequency sound caused by the rotor blade of the axial fan in the circumferential direction. ### Claim 14 (depends on 1) The blower with a silencer according to claim 1, wherein the silencer is disposed in all the fixed blade opening portions. ### Claim 15 (depends on 1) The blower with a silencer according to claim 1, wherein at least one silencer is disposed at a position within 25% of a distance between the fixed blades, from the fixed blade. ### Claim 16 (depends on 14) The blower with a silencer according to claim 14, wherein at least one silencer is disposed at a position within 25% of a distance between the fixed blades, from the fixed blade. ### Claim 17 (depends on 1) The blower with a silencer according to claim 1, wherein the number of blades of the rotor blade is more than the number of blades of the fixed blade.