Electromagnetic Rotor Suction Damping for Variable Displacement Compressors

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Solution Overview

Problem

Variable displacement compressors in air conditioning systems experience noise generation due to suction pulsations, which existing suction damping devices fail to adequately address, often requiring stiff springs that reduce efficiency and increase complexity.

Innovation Solution

An electrically controlled suction damping device using a rotor with a rotational axis and an electromagnetic device to precisely control the flow area through the suction damping device, allowing for variable displacement control without the need for additional flow passageways or complex mechanisms.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a stiff spring is used to bias the plunger of the suction damping device, then the pressure pulsations are better controlled, but the refrigerant undergoes a large pressure drop and the maximum flow capacity is reduced

Engineering Contradiction:

Improvepressure pulsation controlVSAvoidpressure drop

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent replaces the mechanical spring-biased plunger system with an electromagnetic device that uses magnetic fields to control the position of a rotor with flow openings. This substitution eliminates the need for stiff springs while maintaining precise control over refrigerant flow and pressure pulsations, thereby avoiding the large pressure drops associated with mechanical spring systems.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The electromagnetic device acts as an intermediary between the control system and the refrigerant flow. By using magnetic fields to position the rotor, the system achieves precise flow control without the direct mechanical contact and pressure losses inherent in spring-biased plunger systems.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If a spring-loaded plunger is used to control the flow area, then the suction damping function is provided, but the device complexity increases due to additional flow passageways and sealing requirements

Engineering Contradiction:

Improvesuction damping functionVSAvoidflow passageways and sealing

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the flow control function and the damping function into a single rotor component with flow openings. The rotor's rotational position directly controls the flow area while simultaneously providing the damping effect, eliminating the need for separate flow passageways and complex sealing arrangements required by traditional plunger systems.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

By replacing the mechanical plunger-and-spring system with an electromagnetic rotor system, the patent eliminates the complex sealing requirements and additional flow passageways needed to accommodate spring mechanisms and pressure equalization pathways.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If the plunger is biased by a spring to control the flow rate, then the suction damping is achieved, but the spring causes hysteresis effects under certain operating conditions

Engineering Contradiction:

Improvesuction dampingVSAvoidhysteresis of the spring

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent replaces the spring-based mechanical biasing system with an electromagnetic field-based control system. The electromagnetic device can precisely control the rotor position without the elastic deformation and hysteresis characteristics inherent in spring materials, providing more stable and predictable damping performance across varying operating conditions.

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 effectively minimizes noise generation by providing precise control of refrigerant flow, maintaining efficiency and reducing the complexity of the compressor system while ensuring optimal performance across varying operating conditions.

Implementation Method 1

an electromagnetic device configured to control a rotational position of the rotor about the rotational axis

Methodology Applied

Scientific EffectElectromagnetic force: Lorentz Force

Data Source

PatentUS11319939B2Precise control of suction damping device in a variable displacement compressor

Publication Date: 2022.05.03 HANON SYST CO LTD

AI summary

A suction damping device for a variable displacement compressor includes a rotor rotatably received within a stator disposed in a suction port of the variable displacement compressor. The rotor includes an aperture and the stator includes a pair of opposing openings in selective fluid communication with the aperture of the rotor. An electromagnetic device controls a rotational position of the rotor relative to the stator based on a condition of an electrically controlled valve used to control an angle of inclination of a swashplate of the variable displacement compressor. A changing of the rotational position of the rotor relative to the stator causes a variable overlap to be formed between the aperture of the rotor and the openings of the stator to control a flow of a refrigerant through the suction damping device.