Ateliers Busch Sa

Didier Müller

Théodore Iltchev

Jean-Eric Larcher

Stéphane Varrin

Philippe Schwob

Artur Bachmann

Jean Eric Larcher

The present invention concerns a dry vacuum pump comprising:

Dry vacuum pump

A dry pump for gases comprises a first rotor () comprising a first lobe portion (A) and a first screw (B), as well as a second rotor () comprising a second lobe portion (A) and a second screw (B). A casing delimits an internal volume in which are located together the first and second screws (B,B) and the first and second lobe portions (A,A). Each of the first and second screws (B,B) comprises a threading invariable along its length. The first and second rotors () turn in opposite directions and are located in successive configurations. In a first configuration of the rotors, the first and second lobe portions (A,A), a portion of the first screw (B), a portion of the second screw (B) and the casing together delimit a chamber () which is closed. In a second configuration of the rotors, the chamber () has a smaller capacity than in the first configuration. In a third configuration of the rotors, the chamber () is displaced entirely at the first and second screws (B,B) and isolated from the lobe portions.

Dry pump for gas and set of a plurality of dry pumps for gas

A pumping method in a pumping system comprises: a main vacuum pump with a gas inlet port connected to a vacuum chamber and a gas outlet port leading into a conduit before coming out into the gas outlet of the pumping system, a non-return valve positioned in the conduit between the gas outlet port and the gas outlet, and an auxiliary vacuum pump connected in parallel to the non-return valve. The main vacuum pump is activated in order to pump the gases contained in the vacuum chamber through the gas outlet port, simultaneously the auxiliary vacuum pump is activated and continues to operate all the while that the main vacuum pump pumps the gases contained in the vacuum chamber and/or all the while that the main vacuum pump maintains a defined pressure in the vacuum chamber. Also included is a pumping system.

Method of pumping in a system of vacuum pumps and system of vacuum pumps

The present invention relates to a pumping system to generate a vacuum (SP), comprising a main vacuum pump which is a claw pump () having a gas suction inlet () connected to a vacuum chamber () and a gas discharge outlet () leading into a gas evacuation conduit () in the direction of a gas exhaust outlet () outside the pumping system. The pumping system comprises a non-return valve () positioned between the gas discharge outlet () and the gas exhaust outlet (), and an auxiliary vacuum pump () connected in parallel to the non-return valve. In a pumping method by means of this pumping system (SP), the main vacuum pump () is started up in order to pump the gases contained in the vacuum chamber () and to discharge these gases through its gas discharge outlet (), simultaneously to which the auxiliary vacuum pump () is started up. Moreover the auxiliary vacuum pump () continues to pump all the while that the main vacuum pump () pumps the gases contained in the vacuum chamber () and/or all the while that the main vacuum pump () maintains a defined pressure in the vacuum chamber ().

Pumping system for generating a vacuum and method for pumping by means of this pumping system

The present invention relates to a pumping method in a pumping system (SP, SPP) comprising: a main lubricated rotary vane vacuum pump () with a gas inlet port () connected to a vacuum chamber () and a gas outlet port () leading into a conduit () before coming out into the gas outlet () of the pumping system (SP, SPP), a non-return valve () positioned in the conduit () between the gas outlet port () and the gas outlet (), and an auxiliary lubricated rotary vane vacuum pump () connected in parallel to the non-return valve (). According to this method, the main lubricated rotary vane vacuum pump () is activated in order to pump the gases contained in the vacuum chamber () through the gas outlet port (), simultaneously the auxiliary lubricated rotary vane vacuum pump () is activated and continues to operate all the while that the main lubricated rotary vane vacuum pump () pumps the gases contained in the vacuum chamber () and/or all the while that the main lubricated rotary vane vacuum pump () maintains a defined pressure in the vacuum chamber (). The present invention also relates to a pumping system (SP, SPP) able to be used to implement this method.

The present invention relates to a pumping method in a pumping system (SP) comprising: a primary dry screw-type vacuum pump () with a gas entry orifice () connected to a vacuum chamber () and a gas exit orifice () leading into a conduit () before coming out into the gas outlet () of the pumping system (SP), a non-return valve () positioned in the conduit () between the gas exit orifice () and the gas outlet (), and an ejector () connected in parallel to the non-return valve (). According to this method, the primary dry screw-type vacuum pump () is put into operation in order to pump the gases contained in the vacuum chamber () through the gas exit orifice (); in a simultaneous way, the ejector () is fed with working fluid, and the ejector () continues to be fed with working fluid all the time that the primary dry screw-type vacuum pump () pumps the gases contained in the vacuum chamber () and/or all the time that the primary dry screw-type vacuum pump () maintains a defined pressure in the vacuum chamber (). The present invention also relates to a pumping system (SP) able to be used for implementing this method.

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Delémont, Switzerland

Didier Müller