Co-rotating Screw Profile Generation via Tangential Arc Merging

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Solution Overview

Problem

Existing methods for generating tightly intermeshing, self-cleaning, co-rotating screw profiles are mathematically complex and limited to specific designs, making it difficult to create desired profiles for screw and transition elements without predefined sections, and are not universally applicable.

Innovation Solution

A method that generates planar screw profiles using a combination of arcs merging tangentially, allowing for the selection of parameters such as centre distance, outer and inner radii, and angles to create valid, tightly intermeshing, self-cleaning profiles using a pair of compasses and an angle ruler, or a computer program, enabling the generation of any desired profile for screw and transition elements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If known methods for generating screw profiles are used, then tightly intermeshing self-cleaning profiles can be produced, but the methods are mathematically complicated and not universally applicable

Engineering Contradiction:

Improvetightly intermeshing self-cleaning profileVSAvoidmathematical complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The screw profile is segmented into multiple arc sections that can be individually defined and combined. Each arc is characterized by its radius, start angle, and end angle, allowing complex profiles to be built from simple geometric components that are easy to calculate and manufacture

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of generating the screw profile through complex mathematical formulations, the invention inverts the approach by defining the profile through simple arc parameters and using geometric construction methods. The profile is built by sequentially adding arcs rather than solving complex differential equations

Inventive Principle:

Principle #13The other way round (Inversion)

2Adaptability or versatility

If known methods for generating screw profiles are used, then specific profile designs can be achieved, but it is difficult to create desired profiles without predefined sections

Engineering Contradiction:

Improveprofile design flexibilityVSAvoidprofile generation difficulty

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The invention prepares the profile generation by first defining the basic arc parameters and construction rules. Standard arc templates with predefined radius and angle ranges are established, which can be readily combined to create various screw profile designs without starting from scratch each time

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The screw profile is generated by varying key parameters such as arc radius, start angle, end angle, and the sequence of arcs. By changing these parameters, a wide variety of screw profiles can be created from the same basic construction methodology, providing both flexibility and ease of manufacture

Inventive Principle:

Principle #35Parameter changes

3Productivity

If traditional screw profile generation methods are used, then existing profile types can be maintained, but design efficiency and flexibility are limited

Engineering Contradiction:

Improveprofile generation efficiencyVSAvoiddesign flexibility

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

Once a screw profile is generated using the arc-based method, it can be easily copied and modified by adjusting the arc parameters. The modular arc structure allows for rapid replication and variation of successful profile designs, significantly improving design efficiency while maintaining versatility

Inventive Principle:

Principle #26Copying

Data Source

PatentUS8915642B2Method for constructing co-rotating contiguous bodies and computer program product for carrying out said method and screw elements produced accordingly

Publication Date: 2014.12.23 COVESTRO DEUTSCHLAND AG

AI summary

The present invention relates to a method of generating tightly intermeshing, self-cleaning, co-rotating screw profiles, the use of the screw profiles in screw and transition elements, novel screw profiles which have been generated by the method and a computer program product for executing the method in a computer system.