# US 9,039,384 B2 · Suction duct with adjustable diametric fit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,039,384 B2 - Document ID: US9039384B2 - Status: Granted - Kind: B2 - Application number: 13/428,407 - Filed: 2012-03-23 - Published: 2013-09-26 - Granted: 2015-05-26 - Earliest claimed: 2012-03-23 - Assignees: BITZER Kuehlmaschinenbau GmbH - Applicants: Ronald J. Duppert; Thomas Rogalski - Inventors: Ronald J. Duppert; Thomas Rogalski - Web page: https://patentgrep.com/patent/US9039384B2 ## CPC - 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 27/008: {for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine} - F04C 29/12: Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet - F04C 29/0092: {Removing solid or liquid contaminants from the gas under pumping, e.g. by filtering or deposition; Purging; Scrubbing; Cleaning} - F04C 29/045: {of the electric motor in hermetic pumps} - F01C: ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES (internal-combustion aspects F02B53/00, F02B55/00) - F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS ## Abstract A suction duct for a compressor such as a scroll compressor may include a plastic ring body with a metal screen heat staked in a window of the ring body to filter refrigerant gas entering the motor cavity. The ring body may be in surrounding relation of the motor and resiliently compressed in the housing through intermittent contact with the inner housing surface to better seal around the inlet port. Oil drain channels and stabilizing ribs may be along the outside surface of the ring body. ## Claims ### Claim 1 A compressor for compressing a fluid, comprising: a housing having an inlet for receiving the fluid and an outlet returning the fluid; a compressor mechanism adapted to compress the fluid toward the outlet, the compressor mechanism housed in the housing; a drive unit operatively connected to the compressor mechanism for driving the compression mechanism to compress fluid; a suction duct in the housing having an inlet region arranged aver the inlet of the housing, the suction duct having a sealing face about the inlet region, the sealing face being spring biased against an internal surface of the housing; wherein the housing comprises a generally cylindrical shell section, wherein the housing defines an inlet flow axis surrounded by the inlet in which flow initially enters the housing, the suction duct comprising a ring body; and wherein the ring body has a maximum span in a transverse axis that is greater than a maximum span along the inlet flow axis, to cause the ring body to be squeezed along the transverse axis by the shell section, thereby creating a spring biasing force to spring bias the sealing face against the internal surface of the housing. ### Claim 2 (depends on 1) The compressor of claim 1, wherein a spring bias mechanism integral with the suction duct that acts upon the housing in spaced relation to the inlet to spring bias the sealing face against the internal surface of the housing. ### Claim 3 (depends on 2) The compressor of claim 2, wherein the spring bias mechanism is unitarily formed into a body of the suction duct, the suction duct being formed of resilient plastic material that is resiliently deflected as installed in the housing. ### Claim 4 (depends on 1) The compressor of claim 1 wherein the sealing face comprises an arcuate face generally forming to a generally cylindrical surface of the internal surface of the housing. ### Claim 5 (depends on 1) The compressor of claim 1, wherein the ring body is continuous and thereby forms a complete annulus completely surrounding the drive unit in the form of an electrical motor, wherein the compressor mechanism is a scroll compressor comprising scroll compressor bodies having respective bases and respective scroll ribs that project from the respective bases and which mutually engage about an axis for compressing fluid; the electrical motor operative to facilitate relative orbiting movement between the scroll compressor bodies. ### Claim 6 A compressor for compressing a fluid, comprising: a housing having an inlet for receiving the fluid and an outlet returning the fluid; a compressor mechanism adapted to compress the fluid toward the outlet, the compressor mechanism housed in the housing; a drive unit operatively connected to the compressor mechanism for driving the compression mechanism to compress fluid; a suction duct in the housing having an inlet region arranged over the inlet of the housing, the suction duct having a sealing face about the inlet region, the sealing face being spring biased against an internal surface of the housing; wherein the housing comprises a generally cylindrical shell section, wherein the housing defines an inlet flow axis surrounded by the inlet in which flow initially enters the housing, the suction duct comprising a ring body; and wherein the ring body has a maximum span in the inlet flow axis, to cause the ring body to be squeezed along the inlet flow axis by the shell section, thereby creating a spring biasing force to spring bias the sealing face against the internal surface of the housing. ### Claim 7 A compressor for compressing a fluid, comprising; a housing having an inlet for receiving the fluid and an outlet returning the fluid; a compressor mechanism adapted to compress the fluid toward the outlet, the compressor mechanism housed in the housing; a drive unit operatively connected to the compressor mechanism for driving the compression mechanism to compress fluid; and a suction duct in the housing having an inlet region arranged over the inlet of the housing, the suction duct having a sealing face about the inlet region, the sealing face being spring biased against an internal surface of the housing; wherein the suction duct comprises a ring body surrounding the drive unit in the form of an electrical motor, the suction duct defining an inlet port extending through the ring body, the inlet port aligned with the inlet to communicate fluid from the inlet directly into the electrical motor. ### Claim 8 (depends on 7) The compressor of claim 7, further comprising a screen situated in the inlet port of the ring body and arranged to filter out large particles prior to fluid reaching the electrical motor, the inlet port comprising a window completely surrounded by the sealing face. ### Claim 9 (depends on 7) The compressor of claim 7, wherein the ring body is arranged about a vertical axis, further comprising at least one oil return passageway defined between the housing and the suction duct and vertically extending between top and bottom of the ring body at a location around the sealing face and offset from the inlet region. ### Claim 10 (depends on 7) The compressor of claim 7, wherein the ring body comprises a plurality of outer peripheral arcuate wall sections connected to and projecting radially outward from recessed wall sections, wherein the housing defines an inlet flow axis surrounded by the inlet in which flow initially enters the housing that is generally perpendicular to the vertical axis, and a transverse axis extending generally perpendicular to the vertical axis and transverse to the inlet flow axis, the plurality of outer peripheral arcuate wall sections including a first cooperating pair intersecting the inlet flow axis, one outer peripheral arcuate wall section of the first cooperating pair acting upon a generally cylindrical surface of the internal surface of the housing to provide the sealing face, a second cooperating pair intersecting the transverse axis. ### Claim 11 (depends on 10) The compressor of claim 10, wherein a maximum outer dimensional span defined by the second cooperating pair along the transverse axis is greater than a maximum outer dimensional span defined by the first cooperating pair along the inlet flow axis, in a relaxed uncompressed state. ### Claim 12 (depends on 11) The compressor of claim 11, wherein the maximum outer dimensional span defined by the second cooperating pair along the transverse axis is 0.5% to 5% greater than the maximum outer dimensional span defined by the first cooperating pair along the inlet flow axis, in a relaxed uncompressed state. ### Claim 13 (depends on 10) The compressor of claim 10, wherein a maximum outer dimensional span defined by the first cooperating pair along the inlet flow axis is greater than a maximum outer dimensional span defined by the second cooperating pair along the transverse axis, in a relaxed uncompressed state. ### Claim 14 (depends on 13) The compressor of claim 13, wherein the maximum outer dimensional span defined by the first cooperating pair along the inlet flow axis is 0.5% to 5% greater than the maximum outer dimensional span defined by the second cooperating pair along the transverse axis, in a relaxed uncompressed state. ### Claim 15 (depends on 10) The compressor of claim 10, wherein said one outer peripheral arcuate wall section of the first cooperating pair that acts upon a generally cylindrical surface of the internal surface of the housing to provide the sealing face spans a greater angular dimension than the other outer peripheral arcuate wall sections. ### Claim 16 (depends on 10) The compressor of claim 10, wherein recessed walled sections define a smaller outer perimeter than the outer peripheral arcuate wall sections, wherein the housing comprises a generally cylindrical shell section, gaps formed between the recessed walled sections and the generally cylindrical shell section providing oil flow passageways along an outside periphery of the ring body, and wherein the recessed wall sections comprise an inner perimeter, each of the outer peripheral arcuate wall sections other than the one that forms the sealing face comprising interior reliefs along the inner perimeter that extend at radii larger than the inner perimeter. ### Claim 17 A compressor for compressing a fluid, comprising: a housing having an inlet for receiving the fluid and an outlet returning the fluid, the housing comprising a generally cylindrical shell section surrounding a vertical axis, wherein the housing defines an inlet flow axis surrounded by the inlet in which flow initially enters the housing, the inlet flow axis being generally perpendicular to the vertical axis; a compressor mechanism adapted to compress the fluid toward the outlet, the compressor mechanism housed in the housing, the compressor mechanism comprising scroll compressor bodies having respective bases and respective scroll ribs that project from the respective bases and which mutually engage about an axis for compressing fluid; a drive unit operatively connected to the compressor mechanism for driving the compression mechanism to compress fluid, the drive unit being in the form of an electrical motor, the electrical motor operative to facilitate relative orbiting movement between the scroll compressor bodies; and a suction duct in the housing having an inlet region arranged over the inlet of the housing, the suction duct having a sealing face about the inlet region, the sealing face being spring biased against an internal surface of the housing, a spring bias mechanism is unitarily formed into a body of the suction duct, the suction duct being formed of resilient plastic material that is resiliently deflected as installed in the housing, the suction duct comprising a ring body, wherein the sealing face comprises an arcuate face generally forming to a generally cylindrical surface of the internal surface of the housing, further comprising a screen situated in an inlet port of the ring body and arranged to filter out large particles prior to fluid reaching the electrical motor, the inlet port comprising a window completely surrounded by the sealing face; wherein the ring body has a maximum span in a transverse axis that is greater than a maximum span along the inlet flow axis, with the ring body being squeezed along the transverse axis by the shell section, thereby creating spring biasing force to spring bias the sealing face against an internal surface of the housing. ### Claim 18 A compressor for compressing a fluid, comprising: a housing having an inlet for receiving the fluid and an outlet returning the fluid, the housing comprising a generally cylindrical shell section surrounding a vertical axis, wherein the housing defines an inlet flow axis surrounded by the inlet in which flow initially enters the housing, the inlet flow axis being generally perpendicular to the vertical axis; a compressor mechanism adapted to compress a fluid toward the outlet, the compressor mechanism housed in the housing, the compressor mechanism comprising scroll compressor bodies having respective bases and respective scroll ribs that project from the respective bases and which mutually engage about an axis for compressing fluid; a drive unit operatively connected to the compressor mechanism for driving the compression mechanism to compress fluid the drive unit being in the form of an electrical motor, the electrical motor operative to facilitate relative orbiting movement between the scroll compressor bodies; and a suction duct in the housing having an inlet region arranged over the inlet of the housing, the suction duct having a sealing face about the inlet region, the sealing face being spring biased against an internal surface of the housing, a spring bias mechanism is unitarily formed into a body of the suction duct, the suction duct being formed of resilient plastic material that is resiliently deflected as installed in the housing, the suction duct comprising a ring body, wherein the sealing face comprises an arcuate face generally forming to a generally cylindrical surface of the internal surface of the housing, further comprising a screen situated in an inlet port of the ring body and arranged to filter out large particles prior to fluid reaching the electrical motor, the inlet port comprising a window completely surrounded by the sealing face; wherein the ring body has a maximum span in the inlet flow axis that is greater than a maximum span along a transverse axis of the ring body, with the ring body being squeezed along the inlet flow axis by the shell section, thereby creating spring biasing force to spring bias the sealing face against an internal surface of the housing. ### Claim 19 A compressor for compressing a fluid, comprising: a housing having an inlet for receiving the fluid and an outlet returning the fluid the housing comprising a generally cylindrical shell section surrounding a vertical axis, wherein the housing defines an inlet flow axis surrounded by the inlet in which flow initially enters the housing, the inlet flow axis being generally perpendicular to the vertical axis; a compressor mechanism adapted to compress the fluid toward the outlet, the compressor mechanism housed in the housing, the compressor mechanism comprising scroll compressor bodies having respective bases and respective scroll ribs that project from the respective bases and which mutually engage about an axis for compressing fluid; a drive unit operatively connected to the compressor mechanism for driving the compression mechanism to compress fluid, the drive unit being in the form of an electrical motor, the electrical motor operative to facilitate relative orbiting movement between the scroll compressor bodies; and a suction duct in the housing having an inlet region arranged over the inlet of the housing, the suction duct having a sealing face about the inlet region, the sealing face being spring biased against an internal surface of the housing, a spring bias mechanism is unitarily formed into a body of the suction duct, the suction duct being formed of resilient plastic material that is resiliently deflected as installed in the housing, the suction duct comprising a ring body, wherein the sealing face comprises an arcuate face generally forming to a generally cylindrical surface of the internal surface of the housing further comprising a screen situated in an inlet port of the ring body and arranged to fitter out large particles prior to fluid reaching the electrical motor, the inlet port comprising a window completely surrounded by the sealing face; wherein the ring body comprises a plurality of outer peripheral arcuate wall sections connected by recessed walled sections, and a transverse axis extending generally perpendicular to the vertical axis and the inlet flow axis, the plurality of outer peripheral arcuate wall sections including a first cooperating pair intersecting the inlet flow axis, one outer peripheral arcuate wall section of the first cooperating pair acting upon a generally cylindrical surface of the internal surface of the housing to provide the sealing face, a second cooperating pair intersecting the transverse axis, wherein said one outer peripheral arcuate wall section of the first cooperating pair that acts upon a generally cylindrical surface of the internal surface of the housing to provide the sealing face spans a greater angular dimension than the other arcuate sections, and wherein the recessed walled sections define a smaller outer perimeter than the outer peripheral arcuate wall sections, gaps formed between the recessed walled sections and the generally cylindrical shell section providing oil flow passageways past the ring body, and wherein the recessed wall sections comprise an inner perimeter, each of the outer peripheral arcuate wall sections comprising interior reliefs along the inner perimeter that extend at radii larger than the inner perimeter. ### Claim 20 (depends on 19) The compressor of claim 19, wherein a maximum outer dimensional span defined by the second cooperating pair along the transverse axis is greater than a maximum outer dimensional span defined by the first cooperating pair along the inlet flow axis. ### Claim 21 (depends on 19) The compressor of claim 19, wherein a maximum outer dimensional span defined by the first cooperating pair along the inlet flow axis is greater than a maximum outer dimensional span defined by the second cooperating pair along the transverse axis. ### Claim 22 A method for providing a compressor, comprising: housing a compressor mechanism in a housing having an inlet for receiving a fluid and an outlet returning the fluid, the compressor mechanism adapted to compress the fluid toward the outlet; driving the compressor mechanism to compressor the fluid; spring biasing a suction duct in the housing to substantially seal a sealing face of the suction duct against the housing; and inletting fluid through the suction duct with an inlet region having an inlet port formed into the suction duct at least partially surrounded by the sealing face, the inlet port aligned with the inlet; wherein the housing defines an inlet flow axis surrounded by the inlet in which flow initially enters the housing, further comprising forming the suction duct in the shape of a ring, dimensioning the ring to interfere and compress along an axis transverse to the inlet flow axis and expand along the inlet flow axis to provide the spring biasing. ### Claim 23 (depends on 22) The method of claim 22, further comprising: returning oil through gravitational drainage along flow passageways formed between an outer periphery of the ring body and an internal surface of the housing, the flow passageways being spaced from the inlet. ### Claim 24 A method for providing a compressor, comprising: housing a compressor mechanism in a housing having an inlet for receiving a fluid and an outlet returning the fluid, the compressor mechanism adapted to compress the fluid toward the outlet; driving the compressor mechanism to compressor the fluid; spring biasing a suction duct in the housing to substantially seal a sealing face of the suction duct against the housing; and inletting fluid through the suction duct with an inlet region having an inlet port formed into the suction duct at least partially surrounded by the sealing face, the inlet port aligned with the inlet; wherein the housing defines an inlet flow axis surrounded by the inlet in which flow initially enters the housing, further comprising forming the suction duct in the shape of a ring, dimensioning the ring to interfere and compress along the inlet flow axis and expand along an axis transverse to the inlet flow axis to provide the spring biasing. ### Claim 25 (depends on 24) The method of claim 24, further comprising flowing fluid through the ring body through the inlet port extending all the way through the ring body and into a motor cavity housing an electrical motor for driving the compressor mechanism. ### Claim 26 (depends on 24) The method of claim 24, comprising: resiliently flexing the body of suction duct to provide said spring biasing with the body of the suction duct resiliently adjusting and conforming to an internal shape of the housing. ### Claim 27 (depends on 26) The method of claim 26, wherein the housing comprises a generally cylindrical shell section, further comprising contacting the shell discontinuously at angularly spaced apart locations with the ring body with outer peripheral arcuate wall segments of the ring body; connecting the outer peripheral arcuate wall segments of the ring body with recessed walled segments; and relieving an inner perimeter of the outer peripheral arcuate wall segments relative to the inner walled segments, at least other than the one outer peripheral arcuate wall segment that forms the sealing face.