# US 11,078,913 B2 · Two-piece suction fitting > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,078,913 B2 - Document ID: US11078913B2 - Status: Granted - Kind: B2 - Application number: 14/755,257 - Filed: 2015-06-30 - Published: 2017-01-05 - Granted: 2021-08-03 - Earliest claimed: 2015-06-30 - Assignees: BITZER Kuehlmaschinenbau GmbH - Applicants: Ronald J. Duppert - Inventors: Ronald J. Duppert - Web page: https://patentgrep.com/patent/US11078913B2 ## CPC - F04C 29/12: Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet - F01C 21/10: Outer members for co-operation with rotary pistons; Casings (casings for rotary engines or machines in general F16M) - F04C 18/0215: {where only one member is moving} - F04C 23/008: {Hermetic pumps} - F04C 2230/60: Assembly methods - F04C 2240/806: Pipes for fluids; Fittings therefor - F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS - F01C: ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES (internal-combustion aspects F02B53/00, F02B55/00) ## Abstract A suction fitting coupled to a scroll compressor that has an outer housing with an inside diameter and a suction port defined in a wall of the outer housing. A suction duct is disposed inside the outer housing at a spaced distance from the wall of the outer housing. The suction duct defines an entrance port aligned with the suction port. The suction fitting includes a first member being generally cylindrical, and a second member being generally cylindrical. The second member is disposed inside the first member with a portion of the second member extending into the outer housing through the suction port, spanning the spaced distance to the suction duct, and coupling with the entrance port of the suction duct. Neither the first member nor the second member includes a suction screen for filtering out solid contaminants in a flow of refrigerant. ## Claims ### Claim 1 A suction fitting coupled to a scroll compressor, the scroll compressor including an outer housing having an inside diameter and a suction port defined in a wall of the outer housing, and a suction duct disposed inside the outer housing a spaced distance from the wall of the outer housing, the suction fitting comprising: a first member being generally cylindrical, the first member being installed in the suction port; and a second member being generally cylindrical, with the second member disposed inside the first member with a portion of the second member extending into the outer housing through the suction port and spanning the spaced distance to the suction duct and coupling with an entrance port of the suction duct; wherein the suction duct defines the entrance port aligned with the suction port, the suction port having openings at bottom end thereof to guide refrigerant from the inlet port into the housing and beneath a motor housing of the scroll compressor, and to guide oil to an oil sump of the scroll compressor; wherein neither the first member nor the second member includes a suction screen for filtering out solid contaminants in a flow of refrigerant; wherein the first member defines a first inside diameter, and the second member defines a second inside diameter, and, to reduce a flow restriction through the suction fitting, the second inside diameter is at least 95% of the diameter of the first inside diameter. ### Claim 2 (depends on 1) The suction fitting coupled to a scroll compressor of claim 1, wherein the first member has a body portion with the second inside diameter and a nose portion with the first inside diameter, with the second inside diameter larger than the first inside diameter, and the nose portion disposed in the suction port, and the second member has a body portion with a second outside diameter and a nose portion with a first outside diameter, with the second outside diameter larger than the first outside diameter. ### Claim 3 (depends on 2) The suction fitting coupled to a scroll compressor of claim 2, further comprising an annular land inside the first member defined by a change of inside diameter from the second inside diameter to the first inside diameter, the annular land configured to butt against the body portion of the second member comprising an annular seal of the second member to the first member. ### Claim 4 (depends on 3) The suction fitting coupled to a scroll compressor of claim 3 with the change of inside diameter is defined by a curve from the second inside diameter to the first inside diameter. ### Claim 5 (depends on 1) The suction fitting coupled to a scroll compressor of claim 1, wherein the suction fitting, with the second member installed in the first member and engaged with the entrance port, provides a fluid flow path from a distal end of the first member to the suction duct. ### Claim 6 (depends on 1) The suction fitting coupled to a scroll compressor of claim 1, wherein each of the first member and second member is composed of metal. ### Claim 7 (depends on 6) The suction fitting coupled to a scroll compressor of claim 6, wherein the first member is turned steel and the second member is sheet metal. ### Claim 8 (depends on 1) The suction fitting coupled to a scroll compressor of claim 1, wherein the second member provides a limiting flow restriction, wherein, by being free of a suction screen, the limiting flow restriction is no greater than 0.5 psi gage at a flow rate of 10 cfm through the suction fitting. ### Claim 9 (depends on 1) The suction fitting coupled to a scroll compressor of claim 1, wherein the flow of refrigerant is directed through an opening of the second member, the opening having a minimum cross-sectional area of at least 5 sq. cm.