# US 2017/0284398 A1 · Rotary pump having a casing being formed with a communicating hole communicating a space that is between the side plate and the wall surface of the driving machine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0284398 A1 - Document ID: US20170284398A1 - Status: Published application - Kind: A1 - Application number: 15/625,531 - Filed: 2017-06-16 - Published: 2017-10-05 - Earliest claimed: 2010-03-31 - Assignees: Nabtesco Automotive Corporation - Applicants: Nabtesco Automotive Corporation - Inventors: Yoshihiro MITSUHASHI; Katsunori TANAKA; Hiroyuki MURAKAMI; Kouji TAKAHASHI; Taku KAWAKAMI; Ichiro MINATO - Web page: https://patentgrep.com/patent/US20170284398A1 ## CPC - F04C 29/0078: {Fixing rotors on shafts, e.g. by clamping together hub and shaft} - F01C 21/10: Outer members for co-operation with rotary pistons; Casings (casings for rotary engines or machines in general F16M) - F01C 21/104: {Stators; Members defining the outer boundaries of the working chamber} - 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 18/3448: {with axially movable vanes} - F04C 25/02: for producing high vacuum (sealing arrangements F04C27/00; silencing F04C29/06) - F04C 29/0085: {Prime movers} - F04C 29/061: {Silencers using overlapping frequencies, e.g. Helmholtz resonators} - F04C 29/063: {Sound absorbing materials} - F04C 29/068: {the silencing means being arranged inside the pump housing} - F04C 29/12: Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet - F04D 19/00: Axial-flow pumps (F04D21/00 takes precedence; {pump comprising axial flow and radial flow stages F04D17/025}) - F04D 19/04: specially adapted to the production of a high vacuum, e.g. molecular pumps - B60T 13/52: indirect, i.e. vacuum booster units - F04C 2220/10: Vacuum - F04C 2240/30: Casings or housings - F04C 2240/50: Bearings - F04C 2240/60: Shafts - F04C 2240/802: Liners - F04C 2250/102: of the outlet - F05C 2251/044: similar - F05C 2251/048: Heat transfer - 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) - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES - F05C: INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES ## Abstract It is intended to provide a vacuum pump so that without upsizing the vacuum pump, noise and vibration are reduced, heat dissipation property is secured, and the casing is downsized. Therefore, at least one turning part is provided in an exhausting path formed in a casing body. The casing body is formed of a material whose thermal conductivity is higher than that of a rotor and vanes, and a cylinder part where the vanes slide is press fitted in the casing body. ## Claims ### Claim 1 A vacuum pump comprising: rotary compressing elements in a casing, wherein the casing comprises a cylinder chamber in which the rotary compressing elements slide, an expansion chamber which makes a compressed air exhausted from the cylinder chamber to be expanded, and an exhausting path which connects the cylinder chamber and the expansion chamber, and at least one turning part is provided in the exhausting path. ### Claim 2 (depends on 1) The vacuum pump according to claim 1, wherein the exhausting path and the expansion chamber are adjacently provided at a peripheral part of the cylinder chamber in the casing. ### Claim 3 (depends on 1) The vacuum pump according to claim 1, wherein a silence member formed of porous material is arranged in the exhausting path. ### Claim 4 (depends on 1) The vacuum pump according to claim 1, wherein the casing comprises a cylindrical liner which forms the cylinder chamber, the cylindrical liner comprises an exhausting port which is connected to the exhausting path, a diameter of the exhausting port at an inside of the cylinder chamber is larger than a diameter of the exhausting port at an outside of the cylinder chamber, and the exhausting port is formed to a taper shape whose diameter is reduced from the inside to the outside. ### Claim 5 (depends on 1) The vacuum pump according to claim 1, wherein a rotary shaft which drives the rotary compressing elements is comprised, and a front end part of the rotary shaft is supported with a bearing which is provided in the casing. ### Claim 6 A vacuum pump comprising: rotary compressing elements in a casing, wherein the casing comprises: a casing body which is formed of material whose thermal conductivity is higher than that of the rotary compressing elements, and a cylinder part which is press fitted in the casing body and in which the rotary compressing elements slide. ### Claim 7 (depends on 6) The vacuum pump according to claim 6, wherein the casing body and the cylinder part comprises a communicating hole which communicates with the cylinder part by penetrating through the casing body and the cylinder part, and while an inlet pipe is provided at the communicating hole, a front end of the inlet pipe is engaged with the communicating hole of the cylinder part. ### Claim 8 (depends on 6) The vacuum pump according to claim 6, wherein the cylinder part is formed of a material which has a thermal expansion coefficient that is substantially equal to that of the rotary compressing elements. ### Claim 9 (depends on 6) The vacuum pump according to claim 6, wherein in the casing body, the cylinder part is arranged at a position that is offset from the rotation center of the rotary compressing elements, and the expansion chamber that communicates with the cylinder part is formed at the peripheral part of the cylinder part at the side of the rotation center.