# US 11,079,121 B2 · Muffler for a refrigeration system and the refrigeration system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,079,121 B2 - Document ID: US11079121B2 - Status: Granted - Kind: B2 - Application number: 16/637,212 - Filed: 2018-08-08 - Published: 2020-07-16 - Granted: 2021-08-03 - Earliest claimed: 2017-08-09 - Assignees: Carrier Corporation - Applicants: Carrier Corporation - Inventors: Hongyi Li; Yuling Shi - Web page: https://patentgrep.com/patent/US11079121B2 ## CPC - F01N 1/24: by using sound-absorbing materials (F01N1/04, F01N1/06, F01N1/10, F01N1/14, F01N1/16 take precedence) - F24F 1/12: Vibration or noise prevention thereof - F01N 2310/02: Mineral wool, e.g. glass wool, rock wool, asbestos or the like - F01N 2470/04: characterised by shape, disposition or dimensions of apertures - F25B 2500/12: Sound - F25B 2500/13: Vibrations - F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16) - 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) - F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS ## Abstract Provided in the present invention are a muffler (2) for use in a refrigerating device and a refrigerating device. The muffler comprises an outer casing (23), an inner wall (24), and a sound absorbing material (26) provided between the inner wall and the outer casing, the inner wall defining a fluid inlet (21), a fluid outlet (22), and a fluid passage deflected between the fluid inlet and the fluid outlet, wherein at least a partial region of the inner wall is provided with perforations (241, 242, 243, 244), and the inner wall has a higher perforation rate at the inner side of the fluid passage than that at the outer side of the fluid passage. The muffler according to the embodiment of the present invention significantly reduces the sound and vibration of the refrigerating device. ## Claims ### Claim 1 A muffler for use in a refrigerating device, comprising an outer casing, an inner wall, and a sound absorbing material provided between the inner wall and the outer casing, the inner wall defining a fluid inlet, a fluid outlet, and a fluid passage deflected between the fluid inlet and the fluid outlet, wherein at least a partial region of the inner wall is provided with perforations, and the inner wall has a higher perforation rate at the inner side of the fluid passage than that at the outer side of the fluid passage. ### Claim 2 (depends on 1) The muffler according to claim 1, wherein the inner wall defines the fluid passage deflected in the form of an arc. ### Claim 3 (depends on 1) The muffler according to claim 1, wherein the fluid passage is deflected in the range of 75 degrees to 105 degrees. ### Claim 4 (depends on 1) The muffler according to claim 1, wherein the fluid passage has a larger cross-sectional area at the fluid outlet than that at the fluid inlet, the cross-sectional area of the fluid passage gradually increasing from the fluid inlet to the fluid outlet. ### Claim 5 (depends on 1) The muffler according to claim 1, wherein the outer casing and the inner wall are made of a metal material, and the sound absorbing material is glass fiber. ### Claim 6 (depends on 1) The muffler according to claim 1, wherein a plurality of partition walls for partitioning the sound absorbing material are provided between the outer casing and the inner wall. ### Claim 7 (depends on 1) The muffler according to claim 1, wherein the inner wall at the outer side of the fluid passage comprises two end portions near the fluid inlet and the fluid outlet and a middle portion between the two end portions, the inner wall at the outer side of the fluid passage having a larger perforation rate at the two end portions than that at the middle portion. ### Claim 8 (depends on 7) The muffler according to claim 7, wherein the perforation rate of the inner wall at the two end portions of the outer side of the fluid passage is in the range of 5-10%. ### Claim 9 (depends on 7) The muffler according to claim 7, wherein the perforation rate of the inner wall at the middle portion of the outer side of the fluid passage is in the range of 0-5%. ### Claim 10 (depends on 7) The muffler according to claim 7, wherein the perforation rate of the inner wall at the inner side of the fluid passage is in the range of 10-20%. ### Claim 11 (depends on 1) A refrigerating device, comprising the muffler as claimed in claim 1. ### Claim 12 (depends on 11) The refrigerating device according to claim 11, comprising a compressor, a condenser, a throttling device, and an evaporator which form a loop, wherein the muffler is arranged between the compressor and the condenser. ### Claim 13 (depends on 11) The refrigerating device according to claim 11, wherein the fluid inlet of the muffler is directly connected to an outlet of the compressor, and/or the fluid outlet of the muffler is directly connected to an inlet of the condenser.