Noval tooth-type screw rod
A screw and tooth technology, applied in the field of new toothed screw, can solve the problems of low volumetric efficiency, long contact line length, long sealing line length, etc., and achieve the effect of high volumetric efficiency and good application effect.
Active Publication Date: 2007-03-28
SHANGHAI QIYAO SCREW MACHINERY
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Problems solved by technology
[0002] Existing screw tooth types for twin-screw pumps or twin-screw compressors include cycloid tooth type, Archimedes helical tooth type, circular arc tooth type and involute tooth type. Although the screw pump can achieve strict (complete) sealing, its disadvantage is that the length of the contact line is too long, so the volumetric efficiency is not high
[0003] In order to solve this problem, the utility model patent application with the Chinese application number 01215031.2 discloses a new type of toothed screw, whose tooth profile curve consists of cycloid, dedendum arc, addendum arc, cycloid and cycloid. It is composed of the envelope line of the baseline, but the contact line projected on the end surface of this toothed screw is a broken line, and the broken line contact line is relatively long, so the length of the formed sealing line is too long, which affects the volumetric efficiency of the pump or compressor , pressure and other performance
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[0018] Please refer to Fig. 1 and Fig. 2, Fig. 1 is the structural representation of novel toothed screw rod of the present invention, Fig. 2 is the tooth profile curve of screw rod of the present invention, curve abcdefghij is the tooth profile curve on screw rod cross section among Fig. 2, wherein The points a, c, g of the curve are on the addendum circle L 1 On the same diameter of , point a is on the addendum circle L 1 , points c, d, e are on the dedendum circle L 2 , point i, j are on the addendum circle L 1 Above, the curve abc is cycloid, and the curve cde is the dedendum circle L 2 The arc of the curve ija is the addendum circle L 1 , the curve ghi is an elliptical arc, and the curve efg is an elliptical envelope with the ghi curve segment as the baseline. After selecting and testing a variety of curves, it is found that the volumetric efficiency and pressure performance of the screw are significantly improved by using the ellipse and its envelope.
[0019] The s...
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This invention discloses a new-type of tooth screw rod including a screw-rod set with screw teeth, the tooth curve on the cross section of the rod is abcdefghij including a cycloid composed of points a, b and c, a tooth-root arc connected by c, d and e, a tooth top arc connected by I, j and a, c and g are on a same dimension of the top circle, points c, d and e are on the root circle, points I, j and a are on the top circle characterizing that said tooth curve also includes an ellipse arc composed of points g, h and I and an ellipse envelop line connected by e, f and g with ghi ellipse arc as the basic line.
Description
technical field [0001] The invention relates to a novel toothed screw of a twin-screw pump or a twin-screw compressor. Background technique [0002] Existing screw tooth types for twin-screw pumps or twin-screw compressors include cycloid tooth type, Archimedes helical tooth type, circular arc tooth type and involute tooth type. Although the screw pump can achieve strict (complete) sealing, its disadvantage is that the length of the contact line is too long, so the volumetric efficiency is not high. [0003] In order to solve this problem, the utility model patent application with the Chinese application number 01215031.2 discloses a new type of toothed screw, whose tooth profile curve consists of cycloid, dedendum arc, addendum arc, cycloid and cycloid. It is composed of the envelope line of the baseline, but the contact line projected on the end surface of this toothed screw is a broken line, and the broken line contact line is relatively long, so the length of the formed...
Claims
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Inventor 陆征钟子健王玉贵杨毅李敏田兵兵肖芳
Owner SHANGHAI QIYAO SCREW MACHINERY