Mobile Compressor Damping to Reduce Startup and Transit Noise

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Solution Overview

Problem

Mobile refrigeration systems experience noise and component damage due to internal compressor parts contacting the housing during startup, shutdown, and vehicle movement, as they are designed for static use and not optimized for mobile applications.

Innovation Solution

A damped mobile compressor design featuring a housing with first and second dampers that engage the compressor body and motor, limiting movement and applying preloads to inhibit contact with the housing, using springs or other damping structures to reduce noise and damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the compressor is designed for static use without damping structures, then the device complexity is reduced, but noise and component damage occur during mobile operation due to contact between internal parts and housing

Engineering Contradiction:

Improvecomponent durabilityVSAvoidcompressor structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies beforehand cushioning by installing dampers (element 470) and foam material (element 446) in advance within the compressor housing. These damping structures are pre-positioned to cushion and absorb shocks and vibrations that occur during mobile operation, preventing contact between internal compressor parts and the housing before damage can occur.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The patent uses dampers and foam material as intermediary elements between the compressor components and the housing. These intermediaries absorb and dissipate vibrational energy, acting as a mediator that prevents direct contact and potential damage between moving internal parts and the stationary housing during vehicle movement.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If damping structures are added to the compressor, then noise and contact damage are reduced, but the device complexity and manufacturing cost increase

Engineering Contradiction:

Improvenoise and contact damageVSAvoidcompressor structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The damping structures including dampers (470) and foam (446) are installed beforehand to cushion vibrations and prevent noise-generating contact between compressor components and housing during mobile operation, directly addressing the harmful noise and contact damage factors.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The patent converts the harmful vibrations and movements that cause noise and damage into beneficial cushioning forces by using elastomeric dampers and foam materials that absorb and dissipate the vibrational energy, transforming the harmful mechanical contact into controlled energy dissipation.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Stability of the object's composition

If the compressor components are rigidly fixed to prevent movement, then stability is improved, but noise and damage occur due to inability to absorb vibrations during mobile operation

Engineering Contradiction:

Improvecomponent stabilityVSAvoidnoise and contact damage

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent applies dynamics by using elastomeric dampers (470) and foam material (446) that provide controlled flexibility rather than rigid fixation. These dynamic elements allow the compressor components to move slightly and absorb vibrations during mobile operation, maintaining stability while preventing the harmful contact that would occur with rigid mounting.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the mechanical parameters of the mounting system from rigid to elastomeric by using dampers with specific durometer values (e.g., 70-90 Shore A) and foam materials, altering the stiffness and damping characteristics to optimize both stability and vibration absorption during mobile operation.

Inventive Principle:

Principle #35Parameter changes

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 damped compressor effectively reduces noise and prevents damage to components by limiting movement and contact with the housing during operation, enhancing the longevity and quiet operation of mobile refrigeration systems.

Implementation Method 1

a first damper engaging the housing and one of the compressor body and the motor... a second damper engaging the housing and the at least one of the compressor body and the motor

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS11933285B2Damped mobile compressor

Publication Date: 2024.03.19 DOMETIC APPLIANCES

AI summary

A damped compressor used in mobile appliances. The appliances may comprise a compressor which is disposed within a housing and is in fluid communication with a refrigerant system. Within the housing there is an improved damping or stabilizer system which limits movement of electric or mechanical portions, or both, of the compressor within the housing. At startup and shutdown, when oscillations of the components within the housing are generally maximized, the components are limited from contacting the housing internal structure so as to inhibit damage to the compressor and reduce the noise associated with such contact. The components are also damped from movement associated with the mobile application of the compressor.