Electric compressor and refrigerating device having same
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Solution Overview
Problem
Existing refrigeration compressors face challenges in reducing rotary vibration, particularly with alternating current electric motors, where efficiency is reduced due to torque control limitations, and existing vibration mitigation methods, such as springs and disk-shaped weights, are cumbersome and inefficient.
Innovation Solution
The implementation of a torque damping device, featuring a helical torsion coil spring or torsion bar spring, which connects the rotor to the eccentric shaft, stabilizing the angular velocity by absorbing and releasing energy to synchronize the rotation angles, thereby reducing torsional vibration and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a spring is added to mitigate rotation vibration, then vibration transmission to casing is reduced, but device complexity and difficulty of assembly increase
Solution Approach 1:
The patent combines the vibration mitigation function with the existing connecting structure between rotor and eccentric shaft. The torque damping device is integrated into the connection mechanism, merging the coupling function and vibration damping function into a single unified structure, thereby avoiding additional assembly steps while reducing vibration transmission.
Solution Approach 2:
The torque damping device acts as an intermediary element between the rotor and eccentric shaft. It mediates the connection by providing both mechanical coupling and vibration damping through its elastic properties, serving as a buffer that reduces vibration transmission while maintaining the functional connection.
2Stability of the object's composition
If a disk-shaped weight is added to increase inertia force, then angular velocity variation is reduced, but device complexity and space requirements increase
Solution Approach 1:
The patent merges the inertia function with the torque damping device itself. The elastic element of the damping device provides both the vibration damping capability and the inertia effect needed to stabilize angular velocity, eliminating the need for a separate disk-shaped weight and simplifying the overall structure.
Solution Approach 2:
The torque damping device performs multiple functions simultaneously: it dampens torsional vibrations, provides inertia to stabilize angular velocity, and maintains the mechanical connection between rotor and eccentric shaft. This multi-functionality replaces what would otherwise require separate components.
3Object-affected harmful factors
If torque control technology is applied to DC frequency conversion electric motor, then rotary vibration is reduced, but efficiency is reduced and applicability to AC motors is limited
Solution Approach 1:
The patent replaces the electronic torque control system with a mechanical torque damping device. Instead of using complex electronic control to manage torque variations and reduce vibration, the solution employs a passive mechanical damping element that physically absorbs and dissipates torsional vibrations, thereby maintaining motor efficiency while achieving vibration reduction.
Solution Approach 2:
The torque damping device operates autonomously without requiring external control systems. It automatically dampens vibrations through its elastic properties as the rotor and eccentric shaft rotate, providing self-regulating vibration mitigation that does not interfere with motor efficiency or require complex control electronics.
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 solution effectively reduces noise, improves starting performance, minimizes damage from liquid compression, and prevents operation stops due to low voltage, while maintaining motor efficiency across various operation conditions.
Implementation Method 1
a torque damping device (41) configured to connect the rotor (30) with the eccentric shaft (10), wherein a difference between a rotation angle of the eccentric shaft (10) and a rotation angle of the rotor (30) is increased and decreased
Implementation Method 2
featuring a helical torsion coil spring or torsion bar spring, which connects the rotor to the eccentric shaft, stabilizing the angular velocity by absorbing and releasing energy
Implementation Method 3
thereby reducing torsional vibration and noise
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
An electric compressor and a refrigeration device having the same are provided. The electric compressor includes: an electric motor having a stator and a rotor; a compressing mechanism having an eccentric shaft rotatably and slidably connected to the rotor and defining a compressing chamber therein, the compressing chamber being configured to perform a compression by the eccentric shaft; and a torque damping device configured to connect the rotor with the eccentric shaft, in which during the compression of the compressing chamber, a difference between a rotation angle of the eccentric shaft and a rotation angle of the rotor is a phase angle which is increased and decreased.