Three-section type screw rotor and twin-screw vacuum pump comprising same
A three-stage, rotor technology, applied in the direction of rotary piston pumps, pumps, pump components, etc., can solve the weak ability of leakage and backflow between stages, low utilization rate of cross-sectional line area, large leakage and backflow between stages, etc. question
Inactive Publication Date: 2016-09-21
CHINA UNIV OF PETROLEUM (EAST CHINA)
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[0003] Patent US6702558, patent CN104373347 and patent CN102937094 disclose multi-stage screw rotors, the pitch of the suction section is large, and the pitch of the exhaust section is small, which can increase the internal volume ratio of the screw rotor; the screw rotors proposed in the above patents are composed of a The section line shape is generated by helical expansion along the axial direction, that is, the screw rotor with equal section line shape. The width of the tooth top surface of the suction
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[0037] The present invention will be further described below in conjunction with the drawings and embodiments.
[0038] Such as figure 1 Shown is the cross-sectional profile and axial distance diagram of the three-section screw rotor. The three-section 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 spiral 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 Is equal pitch, suction section L 1 And exhaust section L 3 Compressed section L between 2 Transition, compression section L 2 It is a variable pitch; the formula of the axial distance H(τ) and the pitch P(τ) of the screw rotor is as follows:
[0039] H ( τ ) = H 1 ( τ ) , 0 ≤ τ ≤ τ a H 2 ( τ ) , τ a ≤ τ ≤ τ b H 3 ( τ ) ...
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The invention discloses a three-section type screw rotor and a twin-screw vacuum pump comprising the same and belongs to the field of dry twin-screw vacuum pumps. The screw rotor comprises a gas suction section, a compression section and a gas exhaust section, wherein section profile lines of the gas suction section, the compression section and the gas exhaust section change continuously with a spiral expansion angle; the gas suction section and the gas exhaust section have profile lines with the equal pitch and equal sections, the pitch of the gas suction section is larger than that of the gas exhaust section, but the tooth top surface width of the gas suction section is smaller than that of the gas exhaust section; transition from the gas suction section to the gas exhaust section is realized by the aid of the compression section; the compression section has the profile line with the varying pitch and varying section; and tooth surfaces and spiral lines between the gas suction section and the compression section and between the compression section and the gas exhaust section are in smooth transition. The screw rotor can form the relatively large gas suction volume and the relatively small gas exhaust volume within a relatively small axial size, and the inner volume ratio and the sealing performance of the screw rotor are increased; thus, the screw rotor has the advantages of large inner volume ratio, good sealing performance, compact structure, small axial size and low machining difficulty, and the final vacuum and the pumping speed of the twin-screw vacuum pump are increased.
Description
Technical field [0001] The invention relates to a dry twin-screw vacuum pump, in particular to a three-section screw rotor suitable for a dry twin-screw vacuum pump and a twin-screw vacuum pump. Background technique [0002] The dry twin-screw vacuum pump is a positive displacement vacuum pump, which has the advantages of large gas volume, compact structure, high reliability, long life, and good dynamic balance. It is widely used in the chemical, pharmaceutical, semiconductor and food industries; the screw rotor is dry The core components of the twin-screw vacuum pump, the sealing performance, efficiency, and area utilization coefficient of the screw rotor directly affect the pumping speed and ultimate vacuum of the twin-screw vacuum pump. [0003] Patent US6702558, patent CN104373347 and patent CN102937094 disclose multi-segment screw rotors. The pitch of the suction section is large and the pitch of the exhaust section is small, which can increase the internal volume ratio of the...
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Login to view more IPC IPC(8): F04C18/16
CPCF04C18/084F04C18/16F04C2250/20
Inventor 王君刘宏杰崔峰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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