JPH023093U

JPH023093U -

Info

Publication number: JPH023093U
Application number: JP8136288U
Authority: JP
Priority date: 1988-06-20
Filing date: 1988-06-20
Publication date: 1990-01-10

Description

[Brief explanation of the drawing]

第１図は本考案の実施例に係るスクロール式真
空ポンプの縦断面図、第２図は第１図中の要部拡
大断面図である。１……ケーシング、２……固定スクロール、５
……駆動軸、８……旋回スクロール、９……圧縮
室、１１……補助クランク、１２，１４……軸受
収容部、１３，１５……軸受、１９，１９′……
空気連通孔。 FIG. 1 is a longitudinal cross-sectional view of a scroll vacuum pump according to an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a main part in FIG. 1. 1...Casing, 2...Fixed scroll, 5
... Drive shaft, 8 ... Orbiting scroll, 9 ... Compression chamber, 11 ... Auxiliary crank, 12, 14 ... Bearing housing section, 13, 15 ... Bearing, 19, 19' ...
Air communication hole.

Claims

[Scope of utility model registration request]

a casing, a fixed scroll fixed to the casing and having a spiral wrap portion erected on an end plate; a drive shaft rotatably supported by the casing and having a front end inside the casing serving as a crankshaft; an orbiting scroll that is rotatably installed on the crankshaft of the drive shaft and has a spiral wrap section erected on the end plate so as to overlap the wrap section of the fixed scroll and form a sealed space while rotating; , a scroll vacuum pump comprising an auxiliary crank whose axially opposite end sides are respectively supported via bearings in bearing accommodating portions provided in the orbiting scroll and the fixed scroll, and the auxiliary crank is adapted to prevent rotation of the orbiting scroll. , the auxiliary crank is prevented from displacing toward the orbiting scroll by maintaining the inside of the bearing accommodating portion of the fixed scroll at the same pressure as the vacuum chamber on the outer peripheral side of the orbiting scroll. Scroll type vacuum pump.