Pump Bushing Assembly With Compensation Tanks to Prevent Jamming

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Solution Overview

Problem

Existing positive displacement rotary pumps, such as gear and lobe pumps, experience abrasion and jamming issues due to micro-sliding and uneven load distribution on bushing rings, leading to performance degradation and reduced useful life.

Innovation Solution

The introduction of pressurized compensation tanks and bleed channels in the bushing assemblies helps to redistribute the load and reduce specific pressure in high-stress areas, thereby mitigating abrasion and jamming.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional bushing rings are used without additional load distribution features, then the pump structure remains simple, but abrasion and jamming occur due to uneven load distribution and micro-sliding

Engineering Contradiction:

Improvepump performance stabilityVSAvoidbushing ring structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The bushing ring is equipped with protrusions at specific locations where maximum stress occurs. These protrusions locally increase the contact area and distribute the load more evenly, preventing abrasion and jamming only in the critical high-stress zones rather than modifying the entire bushing ring surface.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The bushing ring is divided into multiple functional zones by adding discrete protrusions at strategic positions. Each protrusion acts as an independent load-distributing element, segmenting the stress distribution function across multiple localized features rather than requiring a completely redesigned bushing ring structure.

Inventive Principle:

Principle #1Segmentation

2Reliability

If the bushing ring surface is modified to reduce friction and wear, then abrasion is reduced, but the manufacturing complexity and cost increase

Engineering Contradiction:

Improveresistance to abrasion and jammingVSAvoidbushing ring fabrication

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Instead of modifying the entire bushing ring surface with special coatings or treatments, protrusions are added only at the specific locations where maximum stress and sliding occur. This localized approach reduces abrasion and jamming while minimizing the impact on manufacturing complexity and cost.

Inventive Principle:

Principle #3Local quality

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 solution effectively reduces the surface pressure in high-stress areas, minimizing abrasion and jamming, and enhancing the pump's performance and useful life by improving load distribution and reducing transient response times.

Implementation Method 1

The introduction of pressurized compensation tanks and bleed channels in the bushing assemblies helps to redistribute the load and reduce specific pressure in high-stress areas

Methodology Applied

Scientific EffectPressure distribution: Pascal's Law

Implementation Method 2

at least one bleed channel that connects said compensation tank to a portion of the lateral surface facing the discharge side

Methodology Applied

Scientific EffectFluid flow: Pressure Gradient

Data Source

PatentUS12221959B2Bushing assembly and positive displacement rotary pump comprising said bushing assembly

Publication Date: 2025.02.11 SETTIMA FLOW MECHANISMS SRL

AI summary

Improved bushing assembly (10) for supporting the shafts of the intermeshed rotors of a positive displacement rotary pump avoiding jamming, said bushing assembly (10) comprising on a lateral surface (13) thereof at least one compensation tank (15; 16) facing a suction side of the pump and at least one bleed channel (14) which connects said compensation tank (15; 16) to the discharge side. [FIG. 7]