Secondary pumping group

• Main Authors: PONCET, JEAN-MARC, MATHES, RAINER, RAVEX, ALAIN, GORINAS, GUY
• Format: Patent
• Language: English; French; German
• Published: 09.04.1997
• Edition: 6
• Subjects: BLASTING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-POSITIVE DISPLACEMENT PUMPS; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; STEAM TRAPS OR LIKE APPARATUS FOR DRAINING-OFF LIQUIDS FROMENCLOSURES PREDOMINANTLY CONTAINING GASES OR VAPOURS; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS; THERMAL INSULATION IN GENERAL; WEAPONS

The assembly, associated with a secondary mechanical pump (1), has a cryogenic trap (2) in the form of a ring surrounding the suction side of the pump. The trap is enclosed in a housing (4) forming the pump's suction port. It has a U-shaped cross-section with its open side towards the pump's suction side. The trap is cooled by a pulsed-tube cryogenerator (9) which surrounds the pump beneath the trap and is fed by a compressor (11) through an impedance (12) and an exchanger-regenerator (14). The impedance is in the form of a rotary valve (12) driven by a motor (13), with the exchanger-regenerator, the valve and the motor aligned parallel with the axis of the pump and beneath the cold end of the pulsed tube. The assembly is connected to a chamber in which an industrial process takes place, and a neutral gas is injected into the pump and its flow is regulated according to the pressure in the chamber. Groupe de pompage secondaire associant une pompe secondaire mécanique (1) avec un piège cryogénique (2), caractérisé en ce que ledit piège cryogénique (2) forme un anneau entourant la pompe secondaire mécanique à son aspiration, ledit piège (2) étant enfermé dans un carter (4) délimitant l'ouverture d'aspiration, en parallèle, de la pompe mécanique (1) et du piège cryogénique (2).