Compressor Balance Weight Lead Angle Vibration Reduction
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Solution Overview
Problem
Conventional compressors experience radial rotor vibrations and noise due to crankshaft tilting and bending under compressive loads, making it difficult to reduce these issues effectively without adding new parts.
Innovation Solution
The compressor incorporates first and second balance weights positioned at preset lead angles relative to the rotor's rotation direction, which reduces the vibration acceleration component in the radial direction, thereby minimizing vibrations and noise without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional balance weights are positioned at standard locations, then the structure is simple, but radial vibrations and noise cannot be effectively reduced
Solution Approach 1:
The patent applies parameter changes by positioning the balance weights at a specific lead angle (preset angle in the rotation direction) rather than at standard locations. This angular parameter modification optimizes the counterbalancing effect, effectively reducing radial vibration acceleration components and noise while maintaining structural simplicity.
Solution Approach 2:
The patent uses balance weights as counterweights positioned at a lead angle to counteract the radial vibrations caused by crankshaft tilting and bending. The balance weights create opposing centrifugal forces that cancel out the harmful vibration components, reducing noise and improving operational stability.
2Strength
If the crankshaft is designed to withstand compressive loads, then structural strength is improved, but crankshaft tilting and bending occur causing rotor vibration
Solution Approach 1:
The balance weights positioned at a lead angle generate counterbalancing centrifugal forces that offset the effects of crankshaft tilting and bending under compressive loads. This reduces the radial vibration of the rotor caused by crankshaft position changes, improving overall system stability while maintaining the crankshaft's load-bearing strength.
Solution Approach 2:
The patent introduces asymmetry by positioning the balance weights at a lead angle rather than symmetrically opposite the eccentric portion. This asymmetric positioning optimizes the counterbalancing effect for reducing radial vibrations caused by crankshaft deformation under load.
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 reduces radial rotor vibrations and noise at a low cost by optimizing the placement of balance weights, enhancing the compressor's operational stability and noise reduction.
Implementation Method 1
the centrifugal force of a balance weight
Implementation Method 2
the rotor vibrates in a radial direction
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A compressor comprises a rotating shaft (12) including an eccentric portion (26), a motor including a rotor (6) connected to the rotating shaft (12), a compression mechanism portion driven by the motor via the rotating shaft (12), a first balance weight (101) provided at one end in an axial direction of the rotor (6) on a side facing the compression mechanism portion (2), and a second balance weight (102) provided at the other end in the axial direction of the rotor (6). The first balance weight (101) and the second balance weight (102) are disposed in such a manner that at least either of a center of gravity of the first balance weight (101) or a center of gravity of the second balance weight (102) is positioned at a preset lead angle (θ1, θ2) in a rotation direction of the rotor (6) with respect to a reference plane passing through a rotation center (O) along an eccentric direction of the eccentric portion (26) of the rotating shaft (12). Thus, A compressor capable of reducing vibrations and noises at low cost without adding new parts is provided.