Monobloc housing for vacuum pump
AssigneeAlcatel
InventorsJean-Luc Rival, Albert Cacard, François Houze
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Abstract
The invention concerns a pumping unit wherein the vacuum pump (100) is driven by a motor (3, 4) comprised in a common monobloc housing forming motor housing (5) and oil pan (18) containing a gear assembly (17) for coupling two parallel pump rotors (14). To complement the sealing conditions provided by a dynamic seal (6), the motor stator (4) consists of an electric coil embedded in an oil-tight and gas-tight resin, thereby not requiring other more expensive and bulky sealing means, reducing production cost and enhancing the pumping unit dependability.
Claims6
A dual-rotor vacuum pump unit comprising a pump stator with at least one axial internal cavity receiving two parallel pump rotors mounted to rotate on corresponding bearings and coupled together at a first end by a set of gears enclosed in a gear casing containing oil, the first end of one of the pump rotors being extended axially by a drive shaft engaged in the rotor of a motor unit for driving the vacuum pump, the motor unit having a stator coil and being enclosed in a motor casing extending the gear casing, wherein:
- the motor casing and the gear casing form a common one-piece casing connected to the first end of the pump stator of the vacuum pump;
- inside the common one-piece casing, the stator coil of the motor unit is embedded in a leakproof resin providing sealing that prevents oil and gas escaping to the outside.
Dependencies are inferred from the claim text.