Electric Scroll Compressor Dynamic Balancing via Pressure-Actuated Rotor Weight
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Solution Overview
Problem
Existing electric spiral compressors experience dynamic imbalance due to varying gas forces and operating points, leading to vibrations, noise, and increased loads on bearing elements, with balancing weights only effectively compensating for imbalances at predefined operating points.
Innovation Solution
The electric spiral compressor features a radially displaced balancing weight on the rotor, integrated with a rotor pressure chamber that adjusts based on high-pressure conditions, allowing for dynamic imbalance compensation across varying operating points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If balancing weights are designed and positioned to compensate for dynamic imbalance at a predefined operating point, then dynamic imbalance is compensated at that operating point, but at other operating points the balancing weight has significantly reduced effect or even increases dynamic imbalance
Solution Approach 1:
The balancing weight is made radially displaceable on the rotor instead of being fixed, allowing it to dynamically adjust its position based on operating conditions. The high-pressure chamber fluidly connected to the balancing weight applies pressure that moves the balancing weight radially to different positions, enabling continuous adaptation to varying operating points and maintaining effective dynamic imbalance compensation across the entire operating range
Solution Approach 2:
The system changes the radial position parameter of the balancing weight based on pressure conditions. The high-pressure chamber receives compressed gas from the compressor, and the varying pressure levels correspond to different operating points, automatically adjusting the balancing weight's radial position to match the current operating conditions and maintain optimal balance
2Device complexity
If the balancing weight is fixed on the rotor, then the structure is simple, but it cannot compensate for dynamic imbalance caused by varying gas forces at different operating points
Solution Approach 1:
The balancing weight structure transitions from a fixed configuration to a dynamically adjustable one. The radial displacement mechanism allows the balancing weight to move along the rotor surface, and the high-pressure chamber provides the actuating force. This dynamic structure maintains reliability across varying operating conditions while adding only minimal complexity through the integration of the pressure chamber and displaceable mounting
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 design significantly reduces vibrations, noise, and loads on bearing elements across different operating points by dynamically adjusting the balancing weight to counteract changing dynamic imbalances.
Implementation Method 1
a rotor pressure chamber that is at least radially delimited by the balancing weight and is fluidly connected to the high-pressure chamber, wherein the balancing weight is radially positionable depending on the pressure prevailing in the rotor pressure chamber
Implementation Method 2
the balancing weight is arranged in a radial home position by means of a preloaded spring element and, depending on the pressure prevailing in the rotor base chamber, in at least one radial pressure position
Data Source
Figure 1
AI summary
An electric scroll compressor having an electric motor (22) which has a stationary stator (24) and a rotating rotor (26), wherein the eccentric unit (50) is fastened to the rotor (26), and wherein at least one balance weight (72, 74) is arranged on the rotor (26), and having a high-pressure chamber (68) which is arranged fluidically between the compressor outlet (6) and the compressor unit (58), wherein the balance weight (72, 74) is arranged radially displaceably on the rotor (26), and the rotor has a rotor pressure chamber (88, 90) which is limited at least radially by the balance weight (72, 74) and is fluidically connected to the high-pressure chamber (68), wherein the balance weight (72, 74) can be positioned radially depending on a pressure prevailing in the rotor pressure chamber (88, 90).