Hollow-Roller Compressor with Single Balancing Block
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Solution Overview
Problem
High-speed compressors in household air conditioners experience significant vibration and noise issues due to the large masses of balancing blocks and eccentric portions, leading to increased crankshaft deflection and power consumption.
Innovation Solution
A compressor design with a crankshaft featuring two eccentric portions and rollers, one of which is hollow, reducing the total mass and allowing for a single balancing block to achieve force and torque balance, thereby minimizing the need for additional balancing blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If balancing blocks are arranged at both upper and lower ends of the motor to ensure force balance and torque balance, then the balance of the shaft system is improved, but the crankshaft deflection increases due to the large masses of the balancing blocks
Solution Approach 1:
The patent removes the lower balancing block from the traditional dual-balancing-block configuration, retaining only the upper balancing block. This extraction reduces the total mass on the crankshaft, thereby decreasing crankshaft deflection while still achieving acceptable force and torque balance through optimized positioning and mass of the remaining upper balancing block.
2Productivity
If the compressor operates at high speed to improve productivity, then the compression efficiency is improved, but the vibration and noise increase due to the large masses of balancing blocks and eccentric portions
Solution Approach 1:
By removing the lower balancing block and reducing the mass of the upper balancing block, the patent reduces the total rotating mass on the crankshaft. This reduction in mass directly decreases the centrifugal forces and vibrations generated during high-speed operation, allowing the compressor to maintain high speed with reduced noise and vibration levels.
Solution Approach 2:
The patent optimizes the mass and positioning parameters of the remaining upper balancing block to achieve effective vibration control at high operating speeds. By carefully adjusting these parameters, the system maintains dynamic balance while minimizing the harmful vibrations and noise that would otherwise increase with speed.
3Stability of the object's composition
If the mass of balancing blocks is increased to improve force balance, then the stability of the shaft system is improved, but the power consumption increases
Solution Approach 1:
The patent eliminates the lower balancing block, significantly reducing the total mass that the motor must accelerate and decelerate during each compression cycle. This reduction in moving mass directly decreases the power consumption required to operate the compressor, while the optimized upper balancing block maintains adequate force balance.
Data Source
AI summary
A compressor and an air conditioner. The compressor includes a crankshaft, a first roller, a second roller, a motor rotor and one balancing block. The interior of the first roller is a solid structure, and the interior of the second roller has a hollow portion. The balancing block is disposed at one axial end of the motor rotor, and no balancing block is arranged at another axial end of the motor rotor. A mass center of the first eccentric portion and the first roller is a first mass center, and a first mass-center axis passes through the first mass center and is parallel to an axis of the crankshaft. A mass center of the second eccentric portion and the second roller is a second mass center, and a second mass-center axis passes through the second mass center and is parallel to the axis of the crankshaft.