Cover for centrifugal pump

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Solution Overview

Problem

Conventional heaters for household appliances, such as centrifugal pumps, are inefficient in heat transfer due to the metal cover interposing between the resistor and water, leading to suboptimal heating and potential issues with dirt accumulation and sensor sensitivity.

Innovation Solution

A cover design for centrifugal pumps where the electric resistor crosses the cover, with a heating stretch in contact with the liquid and portions spaced apart, allowing direct contact and improved heat exchange, while also enabling sensitive temperature control and reduced dirt accumulation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the metal cover interposes between the resistor and water, then the resistor is protected from direct contact with water, but heat transfer efficiency deteriorates

Engineering Contradiction:

Improveresistor protectionVSAvoidheat transfer efficiency

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The heating element is divided into multiple heating zones (first heating zone, second heating zone, third heating zone) with different configurations relative to the cover. The first heating zone contacts the cover for protected heating, while the second and third heating zones are spaced apart to enable direct water contact for efficient heat transfer, thus resolving the contradiction between protection and efficiency

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the heating element have different spatial relationships with the cover: some portions are in contact with the cover for protection, while other portions are spaced apart for direct water contact. This local differentiation allows simultaneous achievement of resistor protection and high heat transfer efficiency

Inventive Principle:

Principle #3Local quality

2Reliability

If the heating stretch is entirely in contact with the inner face, then the resistor is protected, but heat exchange optimization deteriorates

Engineering Contradiction:

Improveresistor protectionVSAvoidheating efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The heating element is segmented into multiple heating zones with different contact configurations. The first heating zone contacts the cover for protection, while the second and third heating zones are spaced apart from the cover to maximize direct water contact and heat exchange efficiency

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The heating element extends in multiple dimensions relative to the cover, with portions at different distances from the cover surface. This spatial arrangement allows simultaneous protection (contacting portions) and efficient heat exchange (spaced portions) in different locations

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Productivity

If the resistor crosses the cover with portions spaced apart, then heat exchange is optimized, but dirt accumulation increases

Engineering Contradiction:

Improveheat exchange efficiencyVSAvoiddirt accumulation

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

Different heating zones have different spatial relationships with the cover: the first heating zone contacts the cover for protection and easier cleaning, while the second and third heating zones are spaced apart for optimal heat exchange. This local differentiation balances heat exchange efficiency with dirt accumulation prevention

Inventive Principle:

Principle #3Local quality

4Productivity

If the heating stretch is entirely spaced apart, then direct water contact improves heat exchange, but resistor protection deteriorates

Engineering Contradiction:

Improveheat exchange efficiencyVSAvoidresistor protection

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The heating element is divided into multiple zones with different configurations: the first heating zone contacts the cover for protection, while the second and third heating zones are spaced apart for direct water contact and efficient heat exchange, thus resolving the contradiction between protection and efficiency

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 enhances energy efficiency, optimizes heat exchange, increases sensor sensitivity, and reduces limestone accumulation, allowing for accurate temperature control and reliable operation with less expensive thermostats.

Implementation Method 1

the heating stretch is adapted to be in contact with the liquid... at least one first portion of the heating stretch is in contact with the inner face... at least one second portion of the heating stretch is spaced apart from the inner face

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

substantially all the surface of such spaced apart portion can be lapped by the fluid and therefore can exchange heat with the fluid

Methodology Applied

Scientific EffectConvection: Convection

Data Source

PatentUS10876543B2Cover for centrifugal pump

Publication Date: 2020.12.29 I R C A S P A IND RESISTENZE CORAZZATE E AFFINI

AI summary

A cover (1) for centrifugal pump comprising a heating element (8) which has a heating stretch (10) and two end stretches (12) connected to the heating stretch (10), in which the heating element (8) crosses the cover (1) so that the heating stretch (10) is below the cover (1) and the two end stretches (12) are above the cover (1), and wherein at least one first portion (14) of the heating stretch (10) is in contact with the cover (1), and wherein at least one second portion (16) of the heating stretch (10) is spaced apart from the inner face (4).