| 摘要 |
<p>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.</p> |
