Scroll Compressor Balancer Layout for Low Noise and Vibration

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Solution Overview

Problem

Existing scroll compressors face challenges in effectively suppressing the influence of centrifugal force resulting from the orbital motion of the orbiting scroll, leading to increased noise and vibration.

Innovation Solution

The integration of a bushing balancer with the eccentric bushing and a shaft balancer with the rotary shaft, where the center of gravity of each balancer is positioned to counterbalance the centrifugal forces, thereby reducing the influence of orbital motion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a single balancer is used in existing scroll compressors, then the structure is simple, but the centrifugal force from orbital motion cannot be effectively suppressed

Engineering Contradiction:

Improvecentrifugal force influenceVSAvoidbalancer structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The balancer is divided into two separate components: a shaft balancer attached to the rotary shaft and an orbiting scroll balancer attached to the orbiting scroll. Each balancer independently counterbalances centrifugal forces generated by its respective component, achieving effective suppression of overall centrifugal force influence while maintaining structural simplicity through modular design

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Weight portions are added to both the shaft balancer and orbiting scroll balancer to create counterbalancing forces. The shaft balancer counterbalances centrifugal force from rotary shaft rotation, while the orbiting scroll balancer counterbalances centrifugal force from orbiting scroll motion, effectively suppressing the harmful effects of both

Inventive Principle:

Principle #8Anti-weight (Counterweight)

2Productivity

If the orbiting scroll performs orbital motion to compress fluid, then compression function is achieved, but noise and vibration increase

Engineering Contradiction:

Improvefluid compressionVSAvoidnoise and vibration

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The orbiting scroll balancer with its weight portion generates a counterbalancing force that opposes the centrifugal force produced by the orbiting scroll's orbital motion. This reduces vibration and noise while allowing the orbital motion to continue performing its compression function

Inventive Principle:

Principle #8Anti-weight (Counterweight)

Solution Approach 2:

The centrifugal force generated by the orbiting scroll's orbital motion, which originally caused harmful vibration and noise, is counterbalanced by the orbiting scroll balancer. The system converts the harmful effect into a manageable force through active counterbalancing, allowing the compression function to proceed with reduced negative impacts

Inventive Principle:

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

3Object-affected harmful factors

If balancer weight portions are positioned radially outward, then centrifugal force suppression is enhanced, but manufacturing complexity increases

Engineering Contradiction:

Improvecentrifugal force suppressionVSAvoidbalancer fabrication

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The balancer system is segmented into two independent components with separate weight portions positioned on each. This allows each weight portion to be optimized for its specific function and positioned at the most effective radial location for centrifugal force suppression, while simplifying manufacturing by treating them as separate, modular elements rather than a complex integrated structure

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 configuration effectively suppresses centrifugal forces, reducing noise and vibration, maintaining sealing performance, and preventing wear on the spiral walls, while enhancing low-noise and low-vibration performance.

Implementation Method 1

a bushing balancer provided integrally with the eccentric bushing, the bushing balancer including a first weight portion located radially outward of the eccentric bushing; and a shaft balancer provided integrally with the rotary shaft, the shaft balancer including a second weight portion located radially outward of the rotary shaft

Methodology Applied

Scientific EffectCentrifugal force: Centrifugal Force

Data Source

PatentUS20260022699A1Scroll compressor with shaft balancer and bushing balancer

Publication Date: 2026.01.22 SANDEN CORP

AI summary

In a scroll compressor with a first line VL passing through a center line CL0 of a rotary shaft 30 and a center line CL2 of an eccentric bushing 72, and with a second line HL passing through the line CL0 and being orthogonal to the line VL, a center of gravity G1 of a bushing balancer 721 integral with the bushing 72 is located opposite to the line CL2 across the line HL and opposite to a center line CL1 of an eccentric pin 71 across the line VL, while a center of gravity G2 of a shaft balancer 31 integral with the shaft 30 is located opposite to the line CL2 across the line HL, and on the same side as the line CL1 relative to the line VL.