Closed Compressor Dual Balancing Weight Vibration Reduction
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Solution Overview
Problem
Conventional closed type compressors experience increased vibrations due to the need for a balancing weight that extends beyond the eccentric shaft, leading to a larger centrifugal force and increased overall height to avoid contact with the piston, which complicates balancing and size adjustments.
Innovation Solution
The use of a dual balancing weight system where a first balancing weight is positioned closer to the main shaft and a second balancing weight is positioned further from the axis, allowing for a shorter eccentric shaft and reduced overall height while effectively canceling out inertial and centrifugal forces, thereby reducing vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a balancing weight is provided with sufficient weight and extended beyond the central axis to cancel inertial and centrifugal forces, then vibrations are reduced, but the eccentric shaft must be made longer and the overall height increases to avoid contact with the piston
Solution Approach 1:
The balancing weight is designed with an L-shaped configuration where the weight body extends in a direction substantially perpendicular to the reciprocating direction of the piston. This dimensional change allows the balancing weight to effectively counteract vibrations while avoiding contact with the piston, thereby reducing the required overall height of the compressor.
2Reliability
If the eccentric shaft is made longer to prevent contact between the balancing weight and piston, then contact is avoided, but the weight of the eccentric shaft increases generating larger centrifugal force that increases vibrations
Solution Approach 1:
By changing the orientation of the balancing weight to extend perpendicular to the piston's reciprocating path, the design achieves contact avoidance without requiring an extended eccentric shaft, thus maintaining lower weight and reduced centrifugal force.
Solution Approach 2:
The balancing weight is positioned and dimensioned to effectively counterbalance the centrifugal force generated by the eccentric shaft, compensating for the unbalanced force without requiring excessive shaft length.
3Reliability
If the balancing weight is bent in angle to avoid contact with the piston without changing eccentric shaft length, then contact is avoided, but the sealed container must be increased in height
Solution Approach 1:
The balancing weight extends perpendicular to the piston's reciprocating direction rather than bending at an angle along the shaft axis, achieving contact avoidance while minimizing the height requirement of the sealed container.
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 reduces the weight and length of the eccentric shaft, minimizing vibrations and overall height, while allowing for easier adjustment of the balancing weight to maintain balance, enhancing productivity and applicability in refrigeration and air conditioning systems.
Implementation Method 1
the rotary movement of eccentric shaft portion 12 exerts a centrifugal force on eccentric shaft portion 12
Implementation Method 2
the reciprocating motion of piston 7 generates an inertial force
Data Source
AI summary
A closed type compressor of a low overall height and small vibrations provided with a structure comprising a balancing weight (142) formed of a first balancing weight (146) and a second balancing weight (148) and fixed to eccentric shaft portion (112), the first balancing weight (146) located closer to a main shaft portion (109) than the second balancing weight (148), and the second balancing weight (148) jutting out to a position further from an axis of the eccentric shaft portion (112) than the first balancing weight (146).