A conical screw rotor and its twin screw vacuum pump
A conical screw and rotor technology, used in rotary piston pumps, pumps, pump components, etc., can solve the problem of small exhaust volume, no suction volume, and no maximum increase in the internal volume ratio of the screw rotor and pumping speed. and other problems, to achieve the effect of reducing exhaust volume, compact structure and short axial dimension
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[0038] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0039] Such as figure 1 Shown is the cross-sectional profile and axial distance diagram of the conical screw rotor, the conical screw rotor consists of the suction section L 1 , Compression section L 2 and exhaust section L 3 Composition, suction section L 1 , Compression section L 2 and exhaust section L 3 The range of the helical expansion angle τ is 0≤τ≤τ a , τ a ≤τ≤τ b and τ b ≤τ≤τ c ;Inspiratory section L 1 and exhaust section L 3 For equal pitch, suction section L 1 and exhaust section L 3 Compression section L is used between 2 Make transition, compression segment L 2 It is a variable pitch; the formulas of the axial distance H(τ) and the pitch P(τ) of the screw rotor are as follows:
[0040]
[0041] Among them, τ is the helix expansion angle, rad; for the whole screw rotor, the value range of the helix expansion angle τ is 0≤...
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