# US 10,871,154 B2 · Linear compressor having suction muffler > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,871,154 B2 - Document ID: US10871154B2 - Status: Granted - Kind: B2 - Application number: 15/858,343 - Filed: 2017-12-29 - Published: 2018-07-05 - Granted: 2020-12-22 - Earliest claimed: 2016-12-30 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Kwangwoon Ahn; Kiwon Noh; Jongwoo Lee - Web page: https://patentgrep.com/patent/US10871154B2 ## CPC - F04B 39/0061: {using muffler volumes} - F04B 35/045: {using solenoids} - F04B 37/18: for specific elastic fluids - F04B 39/0027: {Pulsation and noise damping means} - F04B 39/121: {Casings} - F04B 39/0005: {adaptations of pistons} - Y10S 181/403: Refrigerator compresssor muffler - F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F) - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract A linear compressor includes a shell that includes a refrigerant suction part configured to suction refrigerant, a cylinder located in the shell, a piston configured to reciprocate within the cylinder in which the piston includes a piston body and a piston flange, and a suction muffler through which suctioned refrigerant passes in which the suction muffler includes a first muffler disposed in the piston body. The first muffler includes a first muffler body that defines a refrigerant passage and that extends in an axial direction, and a first muffler flange that extends from the first muffler body in a radial direction, that is configured to couple to the piston flange, and that defines a flange communication hole. ## Claims ### Claim 1 A linear compressor comprising: a shell comprising a refrigerant suction part configured to suction refrigerant; a cylinder located in the shell; a piston configured to reciprocate within the cylinder, the piston comprising a piston body that defines a first inner space therein and a piston flange; and a suction muffler through which suctioned refrigerant passes, the suction muffler comprising: a first muffler disposed in the first inner space of the piston body, and a second muffler that contacts the first muffler, the second muffler protruding toward an outside of the piston body and defining a second inner space therein, wherein the first muffler comprises: a first muffler body that defines a refrigerant passage and that extends in an axial direction, and a first muffler flange that extends from the first muffler body in a radial direction, that is coupled to the piston flange, and that defines a flange communication hole configured to provide the refrigerant in the first inner space in the piston body to the second inner space in the second muffler, and wherein the first muffler flange partitions the first inner space in the piston body from the second inner space in the second muffler. ### Claim 2 (depends on 1) The linear compressor according to claim 1, wherein the piston body and the first muffler body are spaced apart from each other to define a discharge space configured to guide refrigerant from the piston to the flange communication hole, and wherein the first inner space comprises the discharge space. ### Claim 3 (depends on 1) The linear compressor according to claim 1, wherein the flange communication hole includes a plurality of flange communication holes. ### Claim 4 (depends on 3) The linear compressor according to claim 3, wherein the first muffler body and the first muffler flange are connected to each other at a rear portion of the first muffler body, and wherein the plurality of flange communication holes are defined radially outside of the rear portion of the first muffler body. ### Claim 5 (depends on 1) The linear compressor according to claim 1, wherein the first muffler further comprises a first flange extension part that extends rearward from a flange connection part of the first muffler flange in the axial direction. ### Claim 6 (depends on 5) The linear compressor according to claim 5, wherein the flange communication hole is defined between the flange connection part and an outer circumferential surface of the first muffler body, and wherein the outer circumferential surface of the first muffler body is configured to guide refrigerant discharged rearward through the flange communication hole to the first flange extension part. ### Claim 7 (depends on 5) The linear compressor according to claim 5, wherein the suction muffler further comprises: a third muffler that accommodates the second muffler. ### Claim 8 (depends on 7) The linear compressor according to claim 7, wherein the first flange extension part comprises a first wall coupled to an inner circumferential surface of the third muffler. ### Claim 9 (depends on 7) The linear compressor according to claim 7, wherein the second muffler comprises a second wall coupled to an inner circumferential surface of the third muffler. ### Claim 10 (depends on 2) The linear compressor according to claim 2, wherein the piston body includes a main body front portion that defines a suction port, and wherein the linear compressor further comprises a suction valve provided at the suction port. ### Claim 11 (depends on 10) The linear compressor according to claim 10, wherein the main body front portion is spaced apart from the first muffler to define a suction space configured to guide refrigerant from the suction muffler to the suction port through the suction space. ### Claim 12 (depends on 11) The linear compressor according to claim 11, wherein the suction space, the discharge space, and the flange communication hole communicate with one another in the axial direction. ### Claim 13 (depends on 7) The linear compressor according to claim 7, wherein each of the first and second mufflers is coupled to the third muffler by press fitting. ### Claim 14 (depends on 7) The linear compressor according to claim 7, further comprising a muffler filter disposed at an interface at which the first muffler and the second muffler are coupled to each other. ### Claim 15 (depends on 10) The linear compressor according to claim 10, further comprising a suction guide part configured to guide refrigerant discharged from the first muffler to the suction port, wherein the suction guide part comprises: a first extension part that extends from an outer circumferential surface of the first muffler body in the radial direction, and a second extension part that is bent from the first extension part and that extends towards the main body front portion of the piston. ### Claim 16 A linear compressor comprising: a shell comprising a refrigerant suction part configured to suction refrigerant; a cylinder located in the shell; a piston configured to reciprocate within the cylinder, the piston comprising a piston body and a piston flange; and a suction muffler through which suctioned refrigerant passes, wherein the suction muffler comprises: a first muffler comprising a first muffler body and a first muffler flange; a second muffler that contacts the first muffler, the second muffler protruding toward an outside of the piston body; and a third muffler configured to accommodate the second muffler, wherein the first muffler flange partitions a first inner space in the piston body from a second inner space in the second muffler, and wherein the first muffler flange defines a plurality of flange communication holes configured to provide the refrigerant in the first inner space in the piston body to the second inner space in the second muffler. ### Claim 17 (depends on 16) The linear compressor according to claim 16, further comprising a muffler filter disposed at an interface at which the first muffler and the second muffler are coupled to each other. ### Claim 18 (depends on 16) The linear compressor according to claim 16, wherein the piston body and the first muffler body are spaced apart from each other to define a discharge space configured to guide refrigerant from the piston to the plurality of flange communication holes, and wherein the first inner space in the piston body comprises the discharge space. ### Claim 19 (depends on 16) The linear compressor according to claim 16, wherein the first muffler body defines a refrigerant passage and extends in an axial direction, and wherein the first muffler flange extends from the first muffler body in a radial direction and is coupled to the piston flange. ### Claim 20 (depends on 16) The linear compressor according to claim 16, wherein the first muffler further comprises a first flange extension part that extends rearward from a flange connection part of the first muffler flange, and wherein the plurality of flange communication holes are arranged along a circumferential direction and disposed between the flange connection part and an outer circumferential surface of the first muffler body.