A three-screw screw with circular arc correction tooth shape

A three-screw and screw technology, applied in the direction of rotary piston/oscillating piston pump components, rotary piston machinery, machine/engine, etc., can solve the problem of increased leakage, increased processing difficulty, and tool life of screw pumps Shortening and other issues, to achieve stable volumetric efficiency, reduce processing difficulty, and prolong service life

Active Publication Date: 2018-08-14
黄山工业泵制造有限公司
View PDF7 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A three-screw screw with circular arc correction tooth shape
  • A three-screw screw with circular arc correction tooth shape
  • A three-screw screw with circular arc correction tooth shape

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0024] see Figure 7 , Figure 8 and Figure 9 , the tooth shape of the original three-screw pump adopts the radial straight line correction three-screw tooth shape, and the tooth shape of each screw end face of the original driven screw 4 is the same, one of which is formed by the radial straight line a 1 b 1 , long epicycloid b 1 c 1 , root circle c 1 d 1 , long epicycloid d 1 e 1 , radial straight line e 1 f 1 and addendum circle f 1 g 1 composition; the tooth profile of each head of the original active screw 3 is the same, one of which is formed by the epicycloid 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 ˊ and root circle f 1 ˊg 1 composition. Due to the radial straight line a in the original driven screw 4-tooth profile 1 b 1 and e 1 f 1 There are sharp corners at both ends of the three-screw pump, which are easy to wear when meshing with the original active screw 3, re...

Embodiment 1

[0031] Embodiment 1, the diameter of the addendum circle of the driving screw 1 is d a =100mm, the following table lists the design dimensions of 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 transition arc radius r of the driven screw 2 o =0.9mm.

[0032]

Embodiment 2

[0033] Embodiment 2, the diameter of the addendum circle of the driving screw 1 is d a =40mm, the following table lists the design dimensions of 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]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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 modification of the tooth profile of a three-screw, more specifically, it relates to a three-screw which adopts an arc to modify the tooth profile. Background technique [0002] In the common three-screw pumps currently on the market, the tooth shape of the driven screw end surface includes dedendum circle, long epicycloid, radial straight line and addendum circle, and the tooth shape of the active screw end surface includes dedendum circle, epicycloid, short Epicycloids and addendum circles. 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 , the volumetric efficiency drops. On the other hand, when using a disc milling cutter or grinding ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap