# US 11,441,563 B2 · Rotary piston compressor/pump/blower with a ventilation channel > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,441,563 B2 - Document ID: US11441563B2 - Status: Granted - Kind: B2 - Application number: 16/981,044 - Filed: 2019-03-13 - Published: 2021-04-15 - Granted: 2022-09-13 - Earliest claimed: 2018-03-15 - Assignees: Gardner Denver Schopfheim GmbH - Applicants: Gardner Denver Schopfheim GMBH - Inventors: Dimitrij Sergey Kavun - Web page: https://patentgrep.com/patent/US11441563B2 ## CPC - F04C 18/123: {with radially or approximately radially from the rotor body extending tooth-like elements, co-operating with recesses in the other rotor, e.g. one tooth} - F04C 29/042: {by injecting a fluid (injection of fluid for sealing, cooling or lubrication F04C29/0007)} - F04C 2220/50: Pumps with means for introducing gas under pressure for ballasting - F04C 2250/10: of the inlet or outlet - Y02T 10/12: Improving ICE efficiencies - F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A rotary piston compressor/pump/blower includes a housing spatially limiting a working chamber, an intake connection for guiding fluid into the working chamber, a pressure connection for guiding the fluid out of the working chamber, and a rotor assembly having a first rotor rotatably arranged in a first working sub-chamber and a second rotor cooperating with the first rotor and rotatably arranged in a second working sub-chamber. The rotary piston compressor/pump/blower also includes a ventilation channel, formed in the housing and connected to the working chamber via a ventilation channel opening, for the temporally limited introducing of air into the working chamber, wherein the ventilation channel opening is open at least in sections, in particular completely open, in a compression phase. ## Claims ### Claim 1 A rotary piston compressor/pump/blower, comprising: a housing defining a working chamber; an intake connection in fluid communication with the working chamber for furnishing fluid to the working chamber; a pressure connection in fluid communication with the working chamber for guiding the fluid out of the working chamber; a rotor assembly including a first rotor rotatably arranged in a first working sub-chamber of the working chamber, and a second rotor rotatably arranged in a second working sub-chamber of the working chamber and cooperating with the first rotor; and a ventilation channel formed in the housing and in fluid communication with the working chamber via a ventilation channel opening for the temporally limited introduction of ambient fluid into the working chamber from outside the housing, the ventilation channel opening open at least in sections in a compression phase. ### Claim 2 (depends on 1) The rotary piston compressor/pump/blower as recited in claim 1, wherein the rotary piston compressor/pump/blower comprises a single stage rotary piston compressor/pump/blower. ### Claim 3 (depends on 1) The rotary piston compressor/pump/blower as recited in claim 1, wherein the ventilation channel opening is controllable via the first rotor. ### Claim 4 (depends on 1) The rotary piston compressor/pump/blower as recited in claim 1, wherein the first rotor and the second rotor, prior to the compression phase, are configured to limit a common working space in the working chamber in a common working-space phase, wherein the ventilation channel opening is closable by the first rotor in the common working-space phase. ### Claim 5 (depends on 4) The rotary piston compressor/pump/blower as recited in claim 4, wherein in the common working-space phase, the pressure connection is configured to be separated from the common working space by at least one of the first rotor or the second rotor. ### Claim 6 (depends on 4) The rotary piston compressor/pump/blower as recited in claim 4, wherein in the common working-space phase, a dead space between the first rotor and the second rotor is configured to be spatially separate in relation to the common working space. ### Claim 7 (depends on 1) The rotary piston compressor/pump/blower as recited in claim 1, wherein the pressure connection is configured to be closed in the compression phase. ### Claim 8 (depends on 1) The rotary piston compressor/pump/blower as recited in claim 1, wherein the ventilation channel opening is configured to be closed by the first rotor in a pushing-out phase. ### Claim 9 (depends on 8) The rotary piston compressor/pump/blower as recited in claim 8, wherein the pressure connection is configured to be at least partially open in the pushing-out phase. ### Claim 10 (depends on 1) The rotary piston compressor/pump/blower as recited in claim 1, wherein the ventilation channel opening is configured to be open prior to opening of the pressure connection. ### Claim 11 (depends on 1) The rotary piston compressor/pump/blower as recited in claim 1, wherein the ventilation channel opening is arranged in a pressure region of the rotary piston compressor/pump/blower. ### Claim 12 (depends on 1) The rotary piston compressor/pump/blower as recited in claim 1, wherein the ventilation channel opening is arranged alongside a pressure connection opening, arranged in the working chamber, of the pressure connection. ### Claim 13 (depends on 1) The rotary piston compressor/pump/blower as recited in claim 1, wherein the ventilation channel opening opens out into the working chamber at a distance from a dead space between the first rotor and the second rotor. ### Claim 14 (depends on 1) The rotary piston compressor/pump/blower as recited in claim 1, wherein the ventilation channel opening is configured to be completely closed by the first rotor during closure of a dead space between the first rotor and the second rotor. ### Claim 15 (depends on 1) The rotary piston compressor/pump/blower as recited in claim 1, wherein the ventilation channel is arranged in a first end part of the housing, and wherein the housing comprises a bearing plate. ### Claim 16 A rotary piston compressor/pump/blower, comprising: a housing defining a working chamber; an intake connection in fluid communication with the working chamber for furnishing fluid to the working chamber; a pressure connection in fluid communication with the working chamber for guiding the fluid out of the working chamber; a rotor assembly including a first rotor rotatably arranged in a first working sub-chamber of the working chamber, and a second rotor rotatably arranged in a second working sub-chamber of the working chamber and cooperating with the first rotor; and a ventilation channel formed in the housing and in fluid communication with the working chamber via a ventilation channel opening for the temporally limited introduction of ambient fluid into the working chamber from outside the housing, the ventilation channel opening open at least in sections in a compression phase, and the ventilation channel opening closed by the first rotor in a pushing-out phase. ### Claim 17 A rotary piston compressor/pump/blower, comprising: a housing defining a working chamber; an intake connection in fluid communication with the working chamber for furnishing fluid to the working chamber; a pressure connection in fluid communication with the working chamber for guiding the fluid out of the working chamber; a rotor assembly including a first rotor rotatably arranged in a first working sub-chamber of the working chamber, and a second rotor rotatably arranged in a second working sub-chamber of the working chamber and cooperating with the first rotor; and a ventilation channel formed in the housing and in fluid communication with the working chamber via a ventilation channel opening for the temporally limited introduction of ambient fluid into the working chamber from outside the housing, the ventilation channel opening open at least in sections in a compression phase, and the ventilation channel opening closed by the first rotor in a pushing-out phase, wherein the first rotor and the second rotor, prior to the compression phase, are configured to limit a common working space in the working chamber in a common working-space phase, wherein the ventilation channel opening is closable by the first rotor and dead space between the first rotor and the second rotor is spatially separate in relation to the common working space in the common working-space phase.