EP 0280892 A3 19890405 - VACCUM PUMP WITH A DEVICE FOR COUNTING THE REVOLUTIONS
Title (en)
VACCUM PUMP WITH A DEVICE FOR COUNTING THE REVOLUTIONS
Publication
Application
Priority
DE 8703108 U 19870228
Abstract (en)
[origin: US4822251A] A vacuum pump has a housing, a pump shaft having a terminal shaft portion, a bearing member mounted in the housing and supporting the pump shaft and a rotor affixed to the pump shaft. The housing has a housing wall forming a side chamber with the bearing member. The terminal shaft portion projects through the bearing member into the side chamber. There is further provided a device for measuring the rpm of the rotor. The device comprises an inductive sensor held in the housing wall and a ferromagnetic member mounted on the terminal shaft portion for rotation in unison therewith. The ferromagnetic member induces electric pulses in the inductive sensor at a rate proprotionate to the rpm of the rotor. A non-magnetic partition separates the inductive sensor from the side chamber.
IPC 1-7
IPC 8 full level
G01F 3/10 (2006.01); F04B 37/16 (2006.01); F04B 39/00 (2006.01); F04C 28/28 (2006.01); F04C 29/00 (2006.01); F04D 15/00 (2006.01); F04D 27/00 (2006.01)
CPC (source: EP US)
F04C 28/28 (2013.01 - EP US); F04D 15/0094 (2013.01 - EP US); F04C 2270/86 (2013.01 - EP US)
Citation (search report)
- [Y] DE 3335864 A1 19850411 - BOSCH GMBH ROBERT [DE]
- [Y] FR 1142139 A 19570913 - CHARMILLES SA ATELIERS
- [A] EP 0194213 A1 19860910 - ELECTRICFIL [FR]
- [AP] GB 2183847 A 19870610 - TEVES METALLWAREN ALFRED
Designated contracting state (EPC)
CH DE FR GB IT LI
DOCDB simple family (publication)
DE 8703108 U1 19880331; DE 3875499 D1 19921203; EP 0280892 A2 19880907; EP 0280892 A3 19890405; EP 0280892 B1 19921028; JP S63215887 A 19880908; US 4822251 A 19890418
DOCDB simple family (application)
DE 8703108 U 19870228; DE 3875499 T 19880202; EP 88101450 A 19880202; JP 3298488 A 19880217; US 16222288 A 19880229