Rotary Shock Absorber for Electric Compressor Vibration
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Solution Overview
Problem
Current electrically driven refrigerant compressors in vehicles experience significant torsional shocks and vibrations during operation, leading to noticeable operating noise and vibration transmission, which are not effectively mitigated by existing solutions, resulting in discomfort and noise complaints.
Innovation Solution
Incorporating a rotary shock absorber element between the orbiting drive and electric drive, specifically on or within the drive shaft, to insulate and dampen rotational shocks and vibrations, reducing their transmission to the stator and rotor elements and ultimately the compressor housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rigid suspension or bracket is used to mount the compressor, then structural stability is improved, but vibration transmission to surrounding components increases
Solution Approach 1:
The patent introduces a rotary shock absorber element as an intermediary component between the orbiting drive and the drive shaft. This element acts as a mediator that decouples the vibration source from the mounting structure, allowing structural stability to be maintained while preventing vibration transmission to surrounding components.
Solution Approach 2:
The rotary shock absorber element provides beforehand cushioning by being pre-installed in the drive shaft to absorb torsional shocks before they can propagate through the compressor structure. This preventive measure reduces vibration transmission while maintaining structural integrity during compression cycles.
2Use of energy by moving object
If the rotor spiral element is directly driven by the electric motor, then power transmission efficiency is improved, but torsional shocks and vibrations increase
Solution Approach 1:
The rotary shock absorber element serves as an intermediary between the electric motor's rotor and the orbiting drive mechanism. It allows power to be transmitted efficiently to drive the compression cycle while simultaneously absorbing the harmful torsional shocks and vibrations generated during operation.
Solution Approach 2:
The patent changes the mechanical parameters of the drive system by introducing a shock absorber element with specific damping characteristics. This modifies the torsional stiffness and damping properties of the drive shaft, allowing efficient power transmission while reducing vibration amplitudes through altered mechanical impedance.
3Productivity
If high-speed compression is implemented, then productivity is improved, but operating noise in the 1kHz to 3kHz range increases
Solution Approach 1:
The rotary shock absorber element provides beforehand cushioning for high-speed compression operations by being pre-configured to absorb torsional shocks at the expected operating speeds. This prevents the generation of noise in the 1kHz to 3kHz range while maintaining high compression productivity.
Solution Approach 2:
The shock absorber element alters the dynamic parameters of the drive system to reduce noise generation during high-speed operation. By modifying the damping characteristics and torsional stiffness, it suppresses vibrations that would otherwise radiate as noise in the problematic frequency range while allowing high compression speeds to be maintained.
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 solution effectively reduces torsional shocks and vibrations, particularly in the frequency range of 1kHz to 3kHz, thereby minimizing operating noise and vibration transmission, enhancing the operational quietness and comfort of vehicles.
Implementation Method 1
a rotary shock absorber element configured to provide insulation and/or damping of rotary shocks that arise from a compression operation in the compressor unit and are transmitted via the orbiting drive to the drive shaft
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to an electric coolant compressor (1), in particular a scroll compressor, having: - a compressor unit (10) with a spiral stator element (11) and a spiral rotor element (12) which can be moved in an orbiting movement relative to the spiral stator element (11); - an electric drive (20) for producing a rotational movement; - a drive shaft (30) for receiving or transmitting the rotational movement of the electric drive (20); and - an orbiting drive (40) which is configured to receive the rotational movement generated by the drive shaft (30), convert the rotational movement into an orbiting movement relative to the spiral stator element (11), and transmit the orbiting movement to the spiral rotor element (12); wherein a rotational impact absorber element (50) is arranged between the orbiting drive (40) and the electric drive (20), in particular on, at and/or within the drive shaft (30), and the rotational impact absorber element (50) is configured to absorb and/or attenuate rotational impacts which are produced by a compression operation in the compressor unit (10) and are transmitted to the drive shaft (30) via the orbiting drive (40) and/or to the spiral stator element (11) via reaction moments.