Rotary Piston Pump Wear Compensation via Detachable Elastomer Tip

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Solution Overview

Problem

Rotary piston pumps with polymer or elastomer piston tips face rapid efficiency decline and premature failure due to wear, with existing solutions being complex and time-consuming to adjust or replace.

Innovation Solution

A rotary piston pump design featuring a polymer or elastomer piston tip with a nut and washer or mat configuration, where the nut is vulcanized within the tip and a fastening screw engages with a radial recess in the base body, allowing for easy attachment and wear compensation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of stationary object

If adjustable piston tips are used to compensate for wear, then the pump's operational life is extended, but the construction becomes more complicated and adjustment becomes time-consuming

Engineering Contradiction:

Improvepump operational lifeVSAvoidpiston construction complexity

Core Design Contradiction:

Duration of action of stationary objectVSDevice complexity

Solution Approach 1:

The piston tip is separated from the base body as a detachable component. This allows the tip to be replaced independently when worn, extending pump life without requiring complex adjustment mechanisms. The segmentation enables simple replacement rather than complex adjustment.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The piston tip is designed with dynamic replaceability through a simple fastening system (screw and nut) rather than fixed attachment. This allows the tip to be easily removed and replaced during maintenance, providing adaptability without increasing overall device complexity.

Inventive Principle:

Principle #15Dynamics

2Reliability

If replaceable piston tips are attached by screws from inside or outside, then the seal between piston tip and base body is improved, but the fastening elements become exposed to the aggressive pumped medium

Engineering Contradiction:

Improveseal qualityVSAvoidexposure to aggressive medium

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The nut is embedded within the piston tip structure, creating a nested arrangement where the fastening elements are housed inside the tip rather than being externally exposed. This protects the fastening elements from the aggressive pumped medium while maintaining the screw connection for attachment.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The piston tip acts as an intermediary structure that shields the fastening elements (screw and nut) from direct contact with the aggressive medium. The tip material serves as a protective barrier, allowing the fastening system to function reliably without being exposed to harmful chemical or physical conditions.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If piston tips are made of polymer or elastomer for better sealing, then the seal is improved, but wear resistance decreases and efficiency declines rapidly

Engineering Contradiction:

Improveseal qualityVSAvoidpiston tip service life

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The piston tip design allows changing the material parameters by replacing the tip with different polymer or elastomer materials as needed. This enables optimization of the balance between sealing properties and wear resistance by selecting appropriate materials for specific application requirements.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The piston tip is designed as a consumable component that can be discarded when worn and replaced with a new tip. This allows the use of softer polymer or elastomer materials that provide good sealing but lower wear resistance, since the tips are economically replaceable rather than requiring long-term durability.

Inventive Principle:

Principle #34Discarding and recovering

4Loss of time

If the piston tip is designed for easy replacement, then the maintenance time is reduced, but the fastening structure becomes more complicated

Engineering Contradiction:

Improvemaintenance timeVSAvoidfastening structure complexity

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The piston tip is segmented as a separate detachable component with its own fastening system. This segmentation allows the tip to be independently removed and replaced without affecting the base body or other components, enabling quick maintenance while keeping the fastening structure relatively simple.

Inventive Principle:

Principle #1Segmentation

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This design enables simple and effective attachment of the piston tip, protecting the attachment parts from the pumped medium and allowing for easy adjustment to compensate for wear, thereby extending the pump's operational life and efficiency.

Implementation Method 1

the nut and the washer or mat are vulcanized into the piston tip

Methodology Applied

Scientific EffectVulcanization:

Data Source

PatentEP1855006B1Rotary piston pump

Publication Date: 2019.05.08 HUGO VOGELSANG MASCHINENBAU GMBH

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AI summary

The invention relates to a rotary lobe pump with one or more rotating pistons for pumping essentially liquid media. A surface layer is attached, at least partially, to the piston as a piston tip (10) made of a polymer, in particular an elastomer. The piston tip (10) is detachably attached to the base body of the rotary lobe.