Compressor Motor Speed Control for Lip Ring Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional compressors experience degraded sealing performance due to thermal expansion issues with lip rings, especially in cold conditions or during low-speed operation, leading to reduced compression efficiency.
Innovation Solution
A compressor design that temporarily increases the motor's rotating speed to promote thermal expansion of the lip ring, enhancing its sealing performance through a controlled warm-up operation, utilizing a control apparatus with sensors and switches to determine the cold state and adjust the motor speed accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the rotating speed of the motor is decreased for power saving or silent operation, then energy consumption is reduced and noise is decreased, but the lip ring cannot thermally expand to achieve sufficient sealing performance
Solution Approach 1:
The control apparatus performs preliminary warm-up operation at high rotating speed before entering low-speed operation mode. This preliminary action heats the lip ring in advance, ensuring it achieves sufficient thermal expansion and sealing performance before the motor transitions to energy-saving low-speed mode, thereby resolving the contradiction between energy consumption and sealing reliability.
2Reliability
If the rotating speed of the motor is increased to promote thermal expansion of the lip ring, then sealing performance is enhanced, but energy consumption increases
Solution Approach 1:
The control apparatus implements periodic warm-up operations at high rotating speed intervals during low-speed operation. Instead of continuously operating at high speed, the system periodically increases rotating speed to maintain lip ring thermal expansion, then returns to energy-saving low-speed mode. This periodic action balances sealing performance requirements with energy consumption reduction.
3Ease of operation
If the compressor is operated in cold regions or after long idle periods, then the lip ring is cold and shrunk, but sealing performance is degraded
Solution Approach 1:
The control apparatus detects cold operating conditions (cold regions or long idle periods) and automatically performs preliminary warm-up operation at high rotating speed before normal operation begins. This preliminary heating action ensures the lip ring achieves proper thermal expansion and sealing capability, enabling reliable operation in cold conditions without manual intervention.
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 approach quickly enhances the sealing performance of the lip ring, thereby improving the compressor's efficiency even during low-speed operations for power saving or silent modes, while avoiding unnecessary warm-up operations when not needed.
Implementation Method 1
If the compressor is operated in a high rotating speed of a motor, the amounts of generation of friction heat and compression heat are caused to increase
Implementation Method 2
the amounts of generation of friction heat and compression heat are caused to increase
Implementation Method 3
Since a dimension of the lip ring serving as the seal member varies due to thermal expansion
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A compressor is provided with: a motor (30); a piston rod (11) which is driven by the motor (30) and reciprocatable within a cylinder (10); a seal member (14) adapted to seal between the piston rod (11) and the cylinder (10); a cold state determining unit (110) adapted to determine whether the compressor is in a cold state or not; and a rotating speed control unit (120) adapted to control a rotating speed of the motor (30) to increase so that a warm-up operation is executed when the cold state determining unit (110) determines that the compressor is in the cold state.