Vacuum pumping system having an oil-lubricated vacuum pump

A vacuum pumping system includes an oil-lubricated vacuum pump, including a stationary pump stator and a rotatable pump rotor, and a motor, including a stationary motor stator and a rotatable motor rotor cooperating with each other for driving in rotation the pump rotor. The motor further includes an oil-tight unit including a metal jacket enclosing the motor rotor and forming a container intended to collect and keep inside the motor any oil leaking from the pump.

Patent

Brief

Patent brief

Problem

How can vibration in electric motors and rotors be reduced?

Novelty

The motor further includes an oil-tight unit including a metal jacket enclosing the motor rotor and forming a container...

Uses

Patent review

Assignee

Agilent Technologies, Inc.

Published

Mar 10, 2026

Inventors

Roberto Carboneri, Andrea Lepore, Andrea Bertallot, Giovanni Iannucci

Domain

Electromechanical systems

Plain-English summary

Problem

How can vibration in electric motors and rotors be reduced?

Solution

vacuum pumping system includes an oil-lubricated vacuum pump, including a stationary pump stator and a rotatable pump rotor, and a motor, including a stationary motor stator and a rotatable motor rotor cooperating with each other for driving in rotation the pump rotor.

Key novelty

The motor further includes an oil-tight unit including a metal jacket enclosing the motor rotor and forming a container intended to collect and keep inside the motor any oil leaking from the pump.

Applications

Patent review

Relevant search intents

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Claims preview

1 . An oil-lubricated vacuum pumping system, comprising: an oil-lubricated vacuum pump comprising a stationary pump stator and a rotatable pump rotor cooperating for pumping a fluid from a pump inlet to a pump outlet; a motor comprising a motor casing housing a stationary motor stator and a rotatable motor rotor cooperating for driving in rotation the pump rotor by a drive shaft having a first axial end, and a second axial end axially opposite the first axial end, the first axial end being nearer to the oil-lubricated vacuum pump than the second axial end, wherein: the motor stator and the motor rotor are separated by an air gap surrounding the motor rotor; and the motor casing comprises a casing axial wall surrounding the motor stator, and a casing end wall comprising a casing end wall inside surface facing the motor rotor; and an oil-tight jacket separate from the motor casing and enclosing at least a portion of the motor rotor, and forming a container configured to collect and keep oil inside the motor and to prevent the oil from leaking from the motor into an environment outside the motor, wherein the oil-tight jacket is composed of an oil-resistant, electrically insulating thermosetting or thermoplastic resin, and comprises: a portion of the motor stator poured with the resin; a resin layer forming a side wall of the container located in the air gap; and a resin layer forming a base of the container located axially adjacent to the second axial end and extending radially outwards from the side wall relative to the drive shaft, wherein the base comprises a base outer surface facing the casing end wall inside surface, and the oil-tight jacket is open at the first axial end and closed at the second axial end. 2 . The oil-lubricated vacuum pumping system according to claim 1 , wherein the drive shaft extends between the motor and the oil-lubricated vacuum pump without a dynamic seal. 3 . The oil-lubricated vacuum pumping system according to claim 1 , wherein: the oil-lubricated vacuum pump comprises a pump casing defining the pump stator and housing the pump rotor; the pump casing comprises a pump casing surface facing the motor and comprising a pump casing recess; the base located axially adjacent to the second axial end is a second base, and the oil-tight jacket further comprises a first base positioned nearer to the oil-lubricated vacuum pump than the second base, the first base and the second base each radially extending towards the motor casing; the first base is clamped between the pump casing and the motor casing, and is clamped between the motor stator and the motor casing; and the first base comprises a first base surface, at least a portion of the first base surface being shaped complementarily with the pump casing recess and engaging the pump casing recess in an oil-tight manner.

Vacuum pumping system having an oil-lubricated vacuum pump

Plain-English summary

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