# US 10,865,796 B2 · Single or multiple stage blower and nested volute(s) and/or impeller(s) therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,865,796 B2 - Document ID: US10865796B2 - Status: Granted - Kind: B2 - Application number: 16/377,505 - Filed: 2019-04-08 - Published: 2019-08-01 - Granted: 2020-12-15 - Earliest claimed: 2005-10-28 - Assignees: ResMed Motor Technologies Inc. - Applicants: ResMed Motor Technologies Inc. - Inventors: Barton John Kenyon; Nicholas Jerome Reed; Andrew Wilson; Ian Malcolm Smith - Web page: https://patentgrep.com/patent/US10865796B2 ## CPC - F04D 17/164: {Multi-stage fans, e.g. for vacuum cleaners} - A61M 16/0057: {Pumps therefor} - A61M 16/0066: {Blowers or centrifugal pumps} - A61M 16/0069: {the speed thereof being controlled by respiratory parameters, e.g. by inhalation} - F01D 5/225: {by shrouding} - F04D 25/0606: {the electric motor being specially adapted for integration in the pump} - F04D 29/023: {especially adapted for elastic fluid pumps} - F04D 29/083: {especially adapted for elastic fluid pumps} - F04D 29/30: Vanes - F04D 29/4226: {Fan casings} - F04D 29/444: {Bladed diffusers} - F04D 29/601: {specially adapted for elastic fluid pumps} - F04D 29/668: {damping or preventing mechanical vibrations} - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)} - F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D) ## Abstract A double-ended blower includes a blower motor assembly supporting opposed first and second shaft ends. The first and second shaft ends have respective first and second impellers attached thereto and enclosed within first and second volutes, respectively. The first volute is connected to an inlet and the second volute is connected to an outlet. The blower motor assembly is supported in a chassis enclosure and a radially outer inter-stage path is between the first and second volute. The second volute is at least partially substantially concentrically nested with the radially outer inter-stage gas path. ## Claims ### Claim 1 A positive airway pressure (PAP) device for generating a supply of pressurized breathable gas for treatment of sleep disordered breathing, the PAP device comprising: a blower to pressurize gas, the blower including a motor having a shaft and an impeller provided to the shaft, the impeller comprising: a first radially-inner shroud, the first radially-inner shroud having an outer diameter; a second radially-outer shroud, the second radially-outer shroud forming a center opening having an inner diameter, wherein the outer diameter of the first radially-inner shroud is smaller than the inner diameter of the second radially-outer shroud; and a plurality of vanes extending between the first radially-inner shroud and the second radially-outer shroud, each of said plurality of vanes including a first radially-extending edge including a radially-inner portion in contact with the first radially-inner shroud and a second radially-extending edge including a radially-outer portion in contact with the second radially-outer shroud along an entire radial length of said second radially-outer shroud, wherein a relatively shorter radially-inner portion of the second radially-extending edge is not in contact with the second radially-outer shroud and a relatively longer radially-outer portion of the first radially-extending edge is not in contact with the first radially-inner shroud. ### Claim 2 (depends on 1) The PAP device according to claim 1, wherein the first radially-inner shroud extends in a plane that is substantially parallel to a plane in which the second radially-outer shroud extends. ### Claim 3 (depends on 1) The PAP device according to claim 1, wherein the first radially-inner shroud includes a hub or bushing adapted to receive the shaft. ### Claim 4 (depends on 1) The PAP device according to claim 1, wherein each of the plurality of vanes has a width or thickness that is approximately constant from the radially-inner portion to the radially-outer portion. ### Claim 5 (depends on 1) The PAP device according to claim 1, wherein each of the plurality of vanes has a height defined by said first and second radially-extending edges that varies at least along a portion thereof. ### Claim 6 (depends on 1) The PAP device according to claim 1, wherein an outer diameter of the second radially-outer shroud is larger than an outer diameter of the first radially-inner shroud. ### Claim 7 (depends on 1) The PAP device according to claim 1, wherein an outer diameter of the second radially-outer shroud is greater than a maximum radial extent of each of the plurality of vanes. ### Claim 8 (depends on 1) The PAP device according to claim 1, wherein each of the plurality of vanes has a stepped transverse edge at its radially outermost end. ### Claim 9 (depends on 1) The PAP device according to claim 1, wherein the impeller comprises a polycarbonate material and/or polypropylene material. ### Claim 10 (depends on 1) The PAP device according to claim 1, wherein each of the plurality of vanes comprises surface disturbances along trailing edges thereof. ### Claim 11 (depends on 1) The PAP device according to claim 1, wherein the first radially-inner shroud is a bottom shroud and the second radially-outer shroud is a top shroud. ### Claim 12 (depends on 1) The PAP device according to claim 1, wherein the impeller comprises a molded one piece construction. ### Claim 13 (depends on 1) The PAP device according to claim 1, wherein the blower is configured to pressurize gas in the range of 4-30 cmH2O. ### Claim 14 (depends on 1) The PAP device according to claim 1, wherein the shaft has two ends and at least one said impeller provided to each said end. ### Claim 15 (depends on 1) A PAP system for delivery of pressurized breathable gas to a patient for treatment of sleep disordered breathing, the PAP system comprising: a PAP device according to claim 1; a patient interface adapted to form a seal with a patient's face; and air delivery tubing to deliver the supply of pressurized breathable gas from the PAP device to the patient interface.