Scroll pump having a biasing apparatus for axially movable fixed and orbiting scrolls against each other via first and second pads that formed material from fixed and orbiting scrolls

A scroll pump comprising:

• a first scroll comprising a first spiral wall and an inner wall located radially inward from the first spiral wall;
• a second scroll comprising a base and a second spiral wall extending from the base, the second spiral wall being intermeshed with the first spiral wall;
• a first pad formed from a different material to the first and second scrolls, the first pad being located between the first and second scrolls radially outwards of the first and second spiral walls;
• a second pad formed from a different material to the first and second scrolls, the second pad being located between the first and second scrolls radially inwards of the first and second spiral walls and axially between the inner wall of the first scroll and the base of the second scroll, the inner wall and second pad preventing a fluid flow out of a space between the first scroll and the second scroll to a central aperture;
• and
• a biasing apparatus configured to bias the first and second scrolls against each other via the first and second pads.