Scroll Compressor Pressure Relief Structure for Low-Torque Restart
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Solution Overview
Problem
The existing scroll compressors require a large starting torque when restarted, leading to difficult starting and affected normal operation due to the check valve isolating the intermediate pressure chamber and discharge space, resulting in pressure imbalances.
Innovation Solution
A scroll compressor design incorporating a pressure relief low-speed rotation structure on the stationary scroll plate, which communicates with the discharge space through a second through hole, allowing refrigerant to flow back and balance pressures, reducing abrasion and abnormal sounds, and improving start-up performance by reducing resistance during reactivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a check valve is disposed on the stationary scroll plate to prevent refrigerant backflow, then the scroll plate is protected from abrasion and abnormal sounds, but the starting torque becomes too large when the compressor is restarted
Solution Approach 1:
A pressure relief hole is introduced as an intermediary channel between the intermediate pressure chamber and discharge space. This mediator allows controlled pressure equalization, preventing the pressure differential that causes high starting torque while the check valve continues to prevent refrigerant backflow during normal operation
Solution Approach 2:
The pressure relief hole provides a preliminary pressure equalization path that activates before the compressor starts. By allowing refrigerant to flow back and balance pressures in advance, the system prepares for restart by reducing the pressure differential that would otherwise create excessive starting torque
2Reliability
If the check valve completely isolates the intermediate pressure chamber and discharge space, then refrigerant backflow is prevented, but the pressure difference cannot be balanced and starting becomes difficult
Solution Approach 1:
The sealing function is segmented into two separate systems: the check valve handles refrigerant backflow prevention during normal operation, while the pressure relief hole handles pressure balancing during shutdown and restart. This segmentation allows each component to perform its specific function without interfering with the other
Solution Approach 2:
The pressure relief hole serves as an intermediary pressure equalization channel that operates independently from the check valve's sealing function. It provides a controlled path for pressure balancing without compromising the check valve's ability to prevent refrigerant backflow
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 pressure relief low-speed rotation structure balances pressure differences between the movable and stationary scroll plates and the discharge space, reducing refrigerant resistance and improving start-up performance by preventing abrasion and abnormal sounds during high-speed rotation.
Implementation Method 1
the pressure in the discharge space is generally greater than that between the movable scroll plate and the stationary scroll plate, and then the remaining refrigerant of the pressure in the discharge space can return to the place between the movable scroll plate and the stationary scroll plate through the second through hole under the action of the pressure
Data Source
AI summary
A scroll compressor is provided. The scroll compressor has a housing, a partition plate, a rack, a movable scroll plate, a stationary scroll plate and a pressure relief low-speed rotation structure. The partition plate is in the interior of the housing and divides the interior of the housing into a suction space and a discharge space, and has a first through to communicate the suction space with the discharge space. The rack is in the suction space and spaced apart from the partition plate. The movable scroll plate is movably provided on the rack. The stationary scroll plate is provided on the rack and cooperates with the movable scroll plate, and has a second through hole communicating with the discharge space. The pressure relief low-speed rotation structure is provided on the stationary scroll plate and configured to communicate the second through hole with the discharge space.