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Triple screw for correcting tooth profiles through arcs

A three-screw and screw technology, used in rotary piston/swing piston pump components, rotary piston machinery, machines/engines, etc., can solve the problem of increased processing difficulty, increased leakage of screw pumps, and tool life. Shortening and other problems to achieve the effect of reducing processing difficulty, stabilizing volumetric efficiency, and prolonging service life

Active Publication Date: 2016-11-16
黄山工业泵制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because there is a sharp angle at the junction of the radial straight line and the addendum circle in the tooth profile of the driven screw, during operation, the driven screw is more likely to wear when it rotates, which increases the leakage of the screw pump during the working process , volumetric efficiency drops
On the other hand, when using a disc milling cutter or grinding wheel to process a screw, not only there are sharp corners in the outline of the milling cutter or grinding wheel, which is easy to wear and shorten the tool life, but also the installation angle of the tool is strictly limited, making the machining difficult increase

Method used

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  • Triple screw for correcting tooth profiles through arcs
  • Triple screw for correcting tooth profiles through arcs
  • Triple screw for correcting tooth profiles through arcs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0024] See Figure 7 , Figure 8 with Picture 9 , The original three-screw pump tooth profile adopts a radial straight line correction three-screw tooth profile, the original driven screw 4 has the same tooth profile on each screw end face, one of which is formed by a radial straight line a 1 b 1 , Long outer cycloid b 1 c 1 , Root circle c 1 d 1 , Long outer cycloid d 1 e 1 , Radial line e 1 f 1 And addendum circle f 1 g 1 Composition; the original driving screw 3 has the same tooth profile on each end of the screw, one of which is formed by the outer cycloid a 1 ˊB 1 ˊ, short epicycloid b 1 ˊC 1 ˊ, addendum circle c 1 ˊD 1 ˊ, short epicycloid d 1 ˊE 1 ˊ, epicycloid e 1 ˊF 1 ˊAnd root circle f 1 ˊG 1 composition. Due to the radial straight line in the 4 tooth profile of the original driven screw a 1 b 1 And e 1 f 1 There are sharp corners at the two ends of the screw, which are easy to wear when meshing with the original active screw 3, causing leakage to increase, causing the ...

Embodiment 1

[0031] Example one, diameter d of the tip circle of the driving screw 1 a =100mm, the following table lists the design dimensions of the driving screw 1 and driven screw 2 of this specification, unit: mm. In this embodiment, in order to reduce the leakage area and maintain a high volumetric efficiency, the excessive arc radius r of the driven screw 2 o =0.9mm.

[0032]

Embodiment 2

[0033] The second embodiment, the diameter d of the tip circle of the driving screw 1 a =40mm, the following table lists the design dimensions of the driving screw 1 and driven screw 2 of this specification, unit: mm. In this embodiment, in order to increase the wear resistance of the driven screw 2, the excessive arc radius r of the driven screw 2 o =0.6mm.

[0034]

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PUM

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Abstract

The invention discloses a triple screw for correcting tooth profiles through arcs. The triple screw comprises two double-end driven screw bodies and a double-end driving screw body. The driving screw body is located in the middle, and the driven screw bodies are symmetrically arranged along the circumference of the driving screw body. Each tooth profile of each driven screw body is composed of the transition arc, a long-amplitude epicycloid, a tooth root circle and a tooth crest circle. Each tooth profile of the driving screw body is composed of an arc envelope line, a tooth crest circle and a tooth root circle. The design range of the radius of the transition arc in each tooth profile of each driven screw body is ro / dj, and the value ranges from 0.015 to 0.025. According to the triple screw for correcting the tooth profiles through the arcs, smoothness is achieved in the engagement process, wear resistance of the driven screw bodies is remarkably improved, the work life of a screw pair is prolonged by about 30% to 40%, and the stable volume efficiency is kept. In addition, when a disc milling cutter or a grinding wheel machines the driving screw body, the service life of the cutter is prolonged by about 50%, and the machining difficulty is reduced.

Description

Technical field [0001] The invention belongs to the technical field of screw pumps, and relates to a three-screw tooth profile modification, and more specifically, it relates to a three-screw that uses an arc to modify the tooth profile. Background technique [0002] At present, the common three-screw pumps on the market have the tooth profile of the driven screw end surface including the root circle, the long epicycloid, the radial straight line and the addendum circle, and the driving screw end surface tooth profile includes the root circle, the epicycloid, short Outer cycloid and addendum circle. Because there is a sharp angle in the tooth profile of the driven screw at the point where the radial straight line and the addendum circle meet, during operation, the driven screw is prone to wear when rotating, which increases the leakage of the screw pump during operation. , The volumetric efficiency drops. On the other hand, when using a disc milling cutter or a grinding wheel t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04C15/00F04C2/16
CPCF04C2/084F04C2/165
Inventor 汪旭辉汪洋黄文程飞
Owner 黄山工业泵制造有限公司
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