# US 2019/0170141 A1 · Vacuum pump > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0170141 A1 - Document ID: US20190170141A1 - Status: Published application - Kind: A1 - Application number: 16/197,756 - Filed: 2018-11-21 - Published: 2019-06-06 - Earliest claimed: 2017-12-06 - Assignees: Joma-Polytec GmbH - Applicants: Joma-Polytec GmbH - Inventors: Hans-Peter OTT; Mathias SCHLOTTERER; Torsten HELLE - Web page: https://patentgrep.com/patent/US20190170141A1 ## CPC - F04C 18/3441: {the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation} - F04C 25/02: for producing high vacuum (sealing arrangements F04C27/00; silencing F04C29/06) - F04C 15/064: {with inlet and outlet valves specially adapted for rotary or oscillating piston machines or pumps} - F04C 18/344: with vanes reciprocating with respect to the inner member - F04C 28/28: Safety arrangements; Monitoring - F04C 2270/701: Cold start - F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS ## Abstract A vacuum pump having a housing which limits a working space and having a rotor, rotatably mounted in the housing about a rotor axis, the rotor guides a vane being movably mounted in the radial direction, the vane has a transverse extent, and the vane divides the working space into a suction side having a suction inlet and a pressure side having a pressure outlet, the housing has at least one oil outlet, the oil outlet is closed by a relief valve, the relief valve assumes an open position, when a limit pressure lying above a nominal pressure is exceeded in the working space, and the transverse extent of the vane is large enough that when the vane passes the oil outlet, the oil outlet is closed by the vane, so that there is no fluid connection between the suction side and the pressure side over the oil outlet. ## Claims ### Claim 1 A vacuum pump, comprising: a housing which limits a working space, and a rotor, which is rotatably mounted in the housing about a rotor axis, wherein the rotor guides at least one vane being movably mounted in a radial direction, wherein the vane has a transverse extent, and wherein the vane divides the working space into a suction side having a suction inlet and a pressure side having a pressure outlet, the housing further comprising at least one oil outlet different from the pressure outlet, wherein the oil outlet is closed by a relief valve, wherein the relief valve assumes an open position when a limit pressure lying above a nominal pressure is exceeded in the working space, and wherein the transverse extent of the vane is large enough that when the vane passes the oil outlet, the oil outlet is closed by the vane, so that there is no fluid connection between the suction side and the pressure side over the oil outlet. ### Claim 2 (depends on 1) The vacuum pump according to claim 1, wherein the rotor and the vane divide the working space in the neutral pump position into a suction side having a suction inlet, a pressure side with a pressure outlet, and a pump side, wherein the volume of the pump side defines the cubic capacity of the pump, and wherein the oil outlet is provided in the region of the pump side, and/or wherein the oil outlet terminates in the working space in the region of the pump side. ### Claim 3 (depends on 1) The vacuum pump according to claim 1, wherein at the outlet, an outlet valve is provided for opening or closing the outlet, wherein the outlet valve assumes an open position when the nominal pressure in the working space is exceeded, and wherein the nominal pressure is lower than the limit pressure. ### Claim 4 (depends on 1) The vacuum pump according to claim 1, wherein the oil outlet is provided at the housing in an axial direction. ### Claim 5 (depends on 1) The vacuum pump according to claim 1, wherein the housing has a housing cover extending transversely to the rotor axis, and wherein the oil outlet is provided in the housing cover. ### Claim 6 (depends on 1) The vacuum pump according to claim 1, wherein the housing has a pot-shaped housing section with a housing bottom, and wherein the oil outlet is provided in the housing bottom. ### Claim 7 (depends on 5) The vacuum pump according to claim 5, wherein the oil outlet extends transversely to the rotor axis in the radial direction. ### Claim 8 (depends on 7) The vacuum pump according to claim 7, wherein a plurality of several oil outlets are provided, and wherein the oil outlets are arranged rotationally symmetrically about the rotor axis. ### Claim 9 (depends on 1) The vacuum pump according to claim 1, wherein the oil outlet is configured in a slotted shape, and wherein the slot width is smaller than the vane width. ### Claim 10 (depends on 1) The vacuum pump according to claim 1, wherein the oil outlet is circular, and wherein the opening diameter is smaller than the van width. ### Claim 11 (depends on 1) The vacuum pump according to claim 1, wherein the relief valve comprises a closing body and a return element, and wherein the return element pushes the closing body into a closed position in which the oil outlet is closed. ### Claim 12 (depends on 11) The vacuum pump according to claim 11, wherein the closing body comprises an elastically pliant closing tongue. ### Claim 13 (depends on 11) The vacuum pump according to claim 11, wherein the return element comprises a leaf spring. ### Claim 14 (depends on 13) The vacuum pump according to claim 13, wherein the closing tongue is formed by the leaf spring, and/or a stop is provided which limits the movement of the closing body from a closed position to the opening position. ### Claim 15 (depends on 10) The vacuum pump according to claim 10, wherein the closing body comprises a closing ball, and/or the return element comprises a spring, in particular a screw spring.