Compressor Rotor Frame Asymmetrical Mass Distribution
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Solution Overview
Problem
Compressors with outer rotor structures face challenges in stabilizing balance weights due to spatial restrictions, leading to unbalanced forces and vibrations during operation, which can cause noise and potential damage.
Innovation Solution
A rotor frame with an asymmetrical mass distribution is designed to offset unbalance forces by varying the weight and number of holes on different sides, allowing the compressor to compensate for centrifugal forces without additional balance weights, effectively reducing vibrations and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If balance weights are mounted to offset unbalance force, then vibration and noise are reduced, but installation space requirements increase and device complexity increases
Solution Approach 1:
The patent merges the balance weight function with the rotor frame structure itself. The rotor frame includes an asymmetrical mass distribution with a first side portion and a second side portion having different weights, where the second side portion serves as an integrated balance weight. This eliminates the need for separate balance weight components while maintaining the vibration offsetting function.
Solution Approach 2:
The rotor frame is designed to serve multiple functions simultaneously: it supports the rotor, transmits rotational force, and provides balance weight functionality through its asymmetrical mass distribution. The structure that originally served only mechanical support now also performs the balancing function, reducing overall device complexity.
2Object-affected harmful factors
If balance weights are mounted to offset unbalance force, then vibration and noise are reduced, but installation space requirements increase
Solution Approach 1:
The balance weight functionality is merged into the existing rotor frame structure, eliminating the need for additional separate balance weight components that would require extra installation space. The asymmetrical mass distribution is achieved by modifying the rotor frame itself.
Solution Approach 2:
The rotor frame features local asymmetry in mass distribution, with the second side portion having greater weight than the first side portion. This localized mass variation is sufficient to provide balancing action without requiring additional space-consuming components throughout the entire device.
3Object-affected harmful factors
If asymmetrical mass distribution is used in rotor frame, then unbalance force is compensated, but manufacturing complexity increases
Solution Approach 1:
The asymmetrical mass distribution is achieved through local modifications to the rotor frame structure, such as varying the thickness or adding mass to specific regions (first side portion vs. second side portion). This localized approach is simpler than redesigning the entire rotor frame and can be accomplished through standard manufacturing techniques.
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 rotor frame's mass distribution design minimizes vibrations and noise, preventing damage by efficiently compensating for unbalance forces, even in constrained spaces, thus enhancing the compressor's operational stability.
Implementation Method 1
the rotor frame has mass distribution for additionally offsetting unbalance force generated by movement of at least one of the piston and the eccentric part of the compressor
Data Source
AI summary
A compressor includes a casing, a motor, a cylinder block including a cylinder, and a piston. The motor include a stator and a rotor located outside the stator, a rotary shaft coupled to the rotor, and a rotor frame that accommodates the rotor and the rotary shaft and that is configured to rotate together with the rotor and transmit rotational force of the rotor to the rotary shaft. The rotary shaft includes an eccentric part configured to rotate based on the rotational force of the rotor and located at a position offset from a rotational axis of the rotary shaft. The piston is coupled to the rotary shaft and configured to reciprocate in the cylinder based on rotation of the eccentric part. The rotor frame has a mass distribution configured to compensate an unbalance force generated by movement of at least one of the piston or the eccentric part.