Scroll Pump Synchronous Motor Axial Force Seal Compression
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Solution Overview
Problem
Scroll vacuum pumps using asynchronous electric motors suffer from low efficiency and high temperature issues, which can lead to reduced service life of sealing materials and increased energy consumption.
Innovation Solution
A scroll pump design utilizing a synchronous motor with a rotor offset to generate an axial force, improving seal compression and efficiency, combined with a controller to regulate rotor speed based on pressure and temperature for energy savings and extended seal life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If an asynchronous electric motor is used to drive the scroll pump, then the pump can operate, but the efficiency is low and high temperatures are generated
Solution Approach 1:
The patent changes the operating parameters of the electric motor by offsetting the rotor axially relative to the stator. This parameter change transforms the motor from an asynchronous motor with poor efficiency into a synchronous motor configuration, thereby improving energy efficiency and reducing temperature generation while maintaining the required driving function.
2Reliability
If the rotor is offset to generate axial force, then seal compression is improved, but the motor structure becomes more complex
Solution Approach 1:
The axial offset of the rotor serves multiple functions simultaneously: it generates the necessary axial force to compress the seals (improving reliability) and transforms the motor into a synchronous configuration (improving efficiency). This multi-functionality approach avoids the need for separate sealing mechanisms, thereby limiting the increase in structural complexity.
3Use of energy by moving object
If rotor speed is varied to save energy, then energy consumption is reduced, but control complexity increases
Solution Approach 1:
The patent implements dynamic speed control of the rotor based on the pumping phase. During the pumping phase, the rotor operates at higher speed to maintain suction capacity, while during the maintenance phase, the speed is reduced to save energy. This dynamic adaptation allows energy optimization with relatively simple control logic that responds to operational conditions.
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 synchronous motor design reduces heat generation and extends seal life, allows for adjustable suction capacity, and achieves energy savings by varying rotor speed, particularly during the maintenance phase of the pumping process.
Implementation Method 1
the rotor of the electric motor is arranged relative to the stator of the electric motor such that during operation of the electric motor a force directed in an axial direction is generated on the rotor
Implementation Method 2
Seen in the axial direction, at least one seal can be arranged between the movable part of the scroll pump stage and a stationary part of the scroll pump stage, which seal is compressed or pressed by the axial force between the movable and the stationary part of the scroll pump stage
Data Source
Figure 1~4
Figure 2A~2B
Figure 3
AI summary
A scroll pump, in particular a scroll vacuum pump, comprises at least one scroll pump stage for conveying a gas from a gas inlet through the scroll pump stage to a gas outlet and an electric motor having a stator and a rotor, wherein the rotor is coupled to the moving part of the scroll pump stage for driving a moving part of the scroll pump stage.