Vibration/noise management in a scroll compressor

A scroll pump comprising:

• a pump head/motor assembly including a stationary plate scroll fixed in the pump, an orbiting plate scroll, a pump motor having a rotary output, and a drive shaft coupling the pump motor to the orbiting plate scroll;
• feet having bottom surfaces that constitute the bottom of the pump, whereby the bottom surfaces of the feet will rest against a support surface when the pump is set on the support surface in its operating position;
• a vibration isolation system to which the pump head/motor assembly is mounted;
• a sound-muffling enclosure interposed between the vibration isolation system and the feet such that the sound-muffling enclosure is also interposed between the pump head/motor assembly and the feet;
• and
• a locking system by which the pump head/motor assembly can be locked independently of the vibration isolation system to the sound-muffling enclosure, and by which the sound-muffling enclosure can be locked to the same support surface that the feet are resting on independently of the feet and without the pump head/motor assembly being locked to the sound-muffling enclosure such that the pump head/motor assembly is supported by the support surface only via the vibration isolation system,
• wherein the pump can be selectively placed using the locking system in a first mode in which the feet are resting against the support surface while the pump head/motor assembly is hard mounted to the sound-muffling enclosure such that it cannot move relative to the sound-muffling enclosure, and
• a second mode in which the feet are resting against the support surface while the pump head/motor assembly is not locked to the sound-muffling enclosure and the sound-muffling enclosure is locked to the support surface independently of the feet, whereby the sound-muffling enclosure can be hard mounted to the support surface such that it cannot move relative to the support surface while the pump head/motor assembly is free mounted to the sound-muffling enclosure via the vibration isolation system such that it can vibrate relative to the sound-muffling enclosure.