Composite Pump Housing Hard Inner Weldable Outer Layer

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Solution Overview

Problem

Conventional pumping devices for biological applications face challenges such as increased manufacturing costs, resource inefficiency, stress on connections, and difficulty in achieving a compact design, especially for implants, due to the use of multiple materials and complex mounting systems.

Innovation Solution

A pumping device with a pump housing composed of a combination of a first hollow body and a further hollow body, where at least 60% of the surface of the first hollow body facing away from the interior is connected to the further hollow body, with a hardness of at least 330 HV and a metal content of at least 50% by weight, allowing for a biocompatible, corrosion-resistant, and stress-free integration into the body.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a pump housing is made from a single material with high hardness for wear resistance, then abrasion resistance is improved, but weldability and biocompatibility are worsened

Engineering Contradiction:

ImproveabrasionVSAvoidweldability

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The pump housing is constructed as a composite structure with an inner layer made of hard material (such as ceramic or hard polymer) for wear resistance and an outer layer made of weldable metal material (such as titanium or stainless steel) for biocompatibility and manufacturability. This composite construction allows each layer to fulfill its specific functional requirements without compromising the other.

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If multiple separate components are used for the pump housing to achieve different material properties, then material performance is improved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improvecorrosion resistanceVSAvoidnumber of components

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The inner layer and outer layer are merged into a single integrated pump housing structure through direct bonding or co-forming processes. This eliminates the need for separate mounting elements and fasteners, reducing the number of components while maintaining the beneficial properties of different materials.

Inventive Principle:

Principle #5Merging (Combining)

3Strength

If mounting elements and fasteners are used to attach the pump housing, then structural integrity is improved, but stress on connections and manufacturing complexity increase

Engineering Contradiction:

Improvestructural integrityVSAvoidconnection stress

Core Design Contradiction:

StrengthVSStress or pressure

Solution Approach 1:

The mechanical connection system (mounting elements and fasteners) is replaced by a direct material bonding between the inner and outer layers. This eliminates connection stresses and the need for additional fastening components, while maintaining structural integrity through the bonded interface.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

The solution provides a cost-effective, space-saving, and stress-free pumping device with reduced abrasion and improved biocompatibility, enabling hermetic sealing and efficient fluid pumping in biological environments.

Implementation Method 1

the contacting is carried out as a force-fit or material-fit connection between the first hollow body and the further hollow body

Methodology Applied

Scientific EffectForce-fit connection:

Implementation Method 2

the contacting is carried out as a force-fit or material-fit connection between the first hollow body and the further hollow body

Methodology Applied

Scientific EffectMaterial-fit connection:

Data Source

PatentEP3011183B1Pump housing with hard inner layer and weldable outer layer

Publication Date: 2020.03.18 HERAEUS DEUTSCHLAND GMBH & CO KG

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AI summary

A pumping device is disclosed, comprising: i) an impeller; ii) a pump housing, which at least partly surrounds an inner region, with an inlet and an outlet, wherein the impeller is provided in the inner region of the pump housing; wherein the pump housing comprises an assembly made up of a first hollow body and a further hollow body, at least partly surrounding the first hollow body on the side facing away from the inner region; wherein at least 60% of the surface of the side of the first hollow body that is facing away from the inner space is connected to the further hollow body, with respect to the surface of the side of the first hollow body that is facing away from the inner space, wherein, with a further surface of the first hollow body, the pump housing is facing the inner region; wherein the further surface of the first hollow body that is facing the inner region of the pump housing has a hardness of at least 330 HV, wherein the further hollow body has a metal content of at least 50% by weight, with respect to the total mass of the further hollow body. Furthermore, a method for producing a pumping device is described. Also described is a pump housing produced by the method according to the invention and also a housing that has the same features as the pump housing of the pumping device according to the invention.