Scroll pump with a plurality of bellows sealing a plurality of adjustment members

A scroll vacuum pump comprising:

• an orbiting scroll;
• a fixed scroll;
• a pump housing enclosing a pump chamber of said scroll vacuum pump;
• an axially extending drive shaft having an eccentric shaft portion, said orbiting scroll being mounted on said eccentric shaft portion such that rotation of said drive shaft imparts an orbiting motion to said orbiting scroll relative to said fixed scroll;
• an axial adjustment mechanism for adjusting an axial position of said orbiting scroll and thereby a distance between said fixed scroll and said orbiting scroll, said axial adjustment mechanism comprising a plurality of adjustment members angularly spaced around said drive shaft and extending through said pump housing towards said orbiting scroll, said plurality of adjustment members each being configured to provide an independently adjustable axial position of said orbiting scroll;
• and
• a plurality of sealing means for isolating said plurality of adjustment members from said pump chamber, said plurality of sealing means extending around each of said plurality of adjustment members and comprising at least one flexible portion such that one end of said sealing means may orbit relative to a fixed other end of said sealing means.