Dual-screw vacuum pump rotor molded line
A technology of rotor profiles and vacuum pumps, applied in pumps, pump components, rotary piston pumps, etc., can solve the problems of large gas leakage of screw vacuum pumps, affect the service life of screw vacuum pumps, and fail to achieve sealing performance, etc., and achieve processing inspection Effects of cost reduction, rich types, and reduction of stress concentration areas
Active Publication Date: 2019-09-27
HEFEI UNIV OF TECH
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- Claims
- Application Information
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Problems solved by technology
Most of the traditional screw vacuum pump screw rotor end surface molding lines have long contact lines, can not completely eliminate the leakage triangle, and poor sealing performance. Affect the service life of the screw vacuum pump
Method used
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Embodiment Construction
[0021] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.
[0022] Depend on image 3 It can be seen that the tooth profile of the screw rotor section is mainly composed of long epicycloid AB with a radius of R f The dedendum circle BC, the hoop cord CD, the hoop cord conjugate envelope DE and the radius R t Composed of addendum circle EA, and the hoop cable line and the hoop cable line conjugate envelope intersect at point D, by figure 1 , figure 2 visible image 3 The formation mechanism of each curve in .
[0023] The formation mechanism of the long epicycloid AB is: the base circle 1 and the rolling circle 2 whose radii are both the size of the pitch circle, and t...
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The invention discloses a dual-screw vacuum pump rotor molded line. The rotor molded line is characterized by being composed of five curve lines sequentially including the prolate epicycloid AB, the root circle BC with the radius of Rf, the strophoid CD, the strophoid conjugate envelope DE and the addendum circle EA with the radius of Rt in the anti-clockwise direction, Rt+Rf is equal to 2r, and r is the pitch radius of a screw rotor. Compared with the prior art, the molded line has the advantages that the shortcoming in the prior art is overcome, the limiting that an existing screw vacuum pump rotor end face molded line is low in area use rate, large in leakage triangle and the like can be overcome, the screw vacuum pump rotor end face molded line is provided, the type of the screw vacuum pump rotor end face molded line is enriched, and the technical problems that a traditional screw rotor is in front and back stage air leaking, poor in seal property and the like are solved.
Description
technical field [0001] The technical field of the screw vacuum pump of the present invention particularly relates to a screw rotor profile of a twin-screw vacuum pump. Background technique [0002] Dry screw vacuum pumps are widely used because of their high pumping speed, high ultimate vacuum, no oil pollution, no friction effect due to non-contact of pumping functional parts, and ability to adapt to harsh working conditions. The screw vacuum pump relies on a pair of intermeshing screw rotors inside to engage and rotate to realize the suction, compression and exhaust process of the vacuum environment gas, so as to continuously pump the gas from the vacuum chamber to the atmosphere. The screw rotor is the core part of the screw vacuum pump, which is helically formed by the end profile. The quality of the end profile directly affects performance parameters such as pumping speed and ultimate vacuum degree of the screw vacuum pump. Most of the traditional screw vacuum pump sc...
Claims
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IPC IPC(8): F04C18/16F04C25/02
CPCF04C18/084F04C18/16F04C25/02F04C2240/20F04C2250/20
Inventor 干蜀毅李斌刘明昆汪亮柴晓彤刘星洲
Owner HEFEI UNIV OF TECH