Electric compressor and refrigeration device having same

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Solution Overview

Problem

Existing refrigeration technologies face challenges in reducing rotary vibration and maintaining stable angular velocity in compressors, particularly with alternating current electric motors, and struggle with noise, starting performance, liquid compression damage, and low voltage operation stops.

Innovation Solution

An electric compressor with a torque damping device, comprising a torsion bar spring, helical torsion coil spring, or spiral spring, connects the rotor to the eccentric shaft, allowing a phase angle difference between their rotation angles to stabilize the angular velocity, thereby reducing vibration and improving performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a spring is added to mitigate rotation vibration, then vibration transmission to casing is reduced, but it becomes difficult to connect the compressing mechanism to the suction tube and align the stator with the rotor

Engineering Contradiction:

Improvevibration transmissionVSAvoidconnection and alignment difficulty

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The patent introduces a torque damping device as an intermediary component between the eccentric shaft and the compressor body. This device includes a damping element that connects to both the eccentric shaft and the compressor body, serving as a mediator that transmits torque while mitigating vibration. The intermediary structure allows for easier connection to the suction tube and better alignment between stator and rotor compared to direct spring mounting.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Stability of the object's composition

If a disk-shaped weight is provided to increase rotor inertia and decrease angular velocity variation, then angular velocity stability improves, but the gap with respect to the electric motor coil cannot be ensured

Engineering Contradiction:

Improveangular velocity stabilityVSAvoidgap distance

Core Design Contradiction:

Stability of the object's compositionVSLength of moving object

Solution Approach 1:

Instead of adding a disk-shaped weight in the radial direction (which would increase rotor diameter and reduce the gap to the coil), the patent uses a torque damping device that acts in the torsional dimension. The damping device provides inertia and angular velocity stabilization through its rotational mass and damping characteristics without increasing the rotor's radial dimensions, thus maintaining the required gap with the electric motor coil.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Object-affected harmful factors

If waveform synthesis of frequency converter is used to control torque, then rotary vibration is reduced, but electric motor efficiency decreases and cost increases

Engineering Contradiction:

Improverotary vibrationVSAvoidelectric motor efficiency

Core Design Contradiction:

Object-affected harmful factorsVSUse of energy by moving object

Solution Approach 1:

The patent replaces the complex electrical control system (waveform synthesis frequency converter) with a mechanical torque damping device. The damping device uses passive mechanical elements (springs, dampers, or inertial masses) to absorb and dissipate vibration energy directly at the source, eliminating the need for complex torque control algorithms and frequency conversion, thereby maintaining electric motor efficiency while reducing rotary vibration.

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 reduces noise, enhances starting performance, minimizes damage from liquid compression, and prevents operation stops due to low voltage, while maintaining efficient motor operation.

Implementation Method 1

during the compression of the compressing chamber, a difference between a rotation angle of the eccentric shaft and a rotation angle of the rotor is a phase angle which is increased and decreased

Methodology Applied

Scientific EffectPhase angle difference:

Implementation Method 2

a torque damping device configured to connect the rotor with the eccentric shaft

Methodology Applied

Scientific EffectTorque damping: Damping

Implementation Method 3

the torque damping device includes one of a torsion bar spring, a helical torsion coil spring and a spiral spring

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 4

by providing the torque damping device, the angular velocity of the rotor is stable... noise reduction

Methodology Applied

Scientific EffectVibration absorption: Damping

Data Source

PatentUS10626867B2Electric compressor and refrigeration device having same

Publication Date: 2020.04.21 GUANGDONG MEIZHI COMPRESSOR

AI summary

An electric compressor and a refrigeration device having the same are provided. The electric compressor includes: an electric motor having a stator and a rotor; a compressing mechanism having an eccentric shaft rotatably and slidably connected to the rotor and defining a compressing chamber therein, the compressing chamber being configured to perform a compression by the eccentric shaft; and a torque damping device configured to connect the rotor with the eccentric shaft, in which during the compression of the compressing chamber, a difference between a rotation angle of the eccentric shaft and a rotation angle of the rotor is a phase angle which is increased and decreased.