Variable Displacement Compressor Suction Control for Vibration Reduction
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Solution Overview
Problem
Piston type variable displacement compressors experience self-excited vibration and noise due to suction pulsation, particularly during small displacement operations, as the suction reed valve does not open sufficiently, leading to inadequate throttling and performance deterioration.
Innovation Solution
A variable displacement compressor with an opening control valve that adjusts the suction passage based on the pressure difference between the suction pressure and the crank chamber pressure, ensuring sufficient flow rate during maximum displacement and effective throttling during small displacement operations by varying the crank chamber pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stopper is adjusted to the maximum displacement state, then the suction reed valve can be prevented from self-excited vibration during maximum displacement operation, but the suction reed valve does not open sufficiently during small displacement operation, causing self-excited vibration and suction pulsation
Solution Approach 1:
The invention replaces the fixed stopper adjustment with a dynamic control mechanism. The suction passage opening is controlled by a valve that dynamically adjusts the opening degree based on the actual displacement requirements, allowing the system to adapt to different operating conditions (maximum displacement vs. small displacement) and prevent self-excited vibration only when necessary.
Solution Approach 2:
The invention changes the control parameter from a fixed mechanical stopper position to a variable valve opening degree. By controlling the opening degree of the suction passage valve according to different displacement states, the system can maintain optimal performance across varying operating conditions, preventing vibration during small displacement while ensuring sufficient flow during maximum displacement.
2Object-affected harmful factors
If the opening control valve is operated to prioritize throttle effect, then suction pulsation is reduced during small displacement operation, but the throttle effect causes deterioration in performance during maximum displacement operation
Solution Approach 1:
The opening control valve dynamically adjusts the suction passage opening degree based on real-time operating conditions. During small displacement operation, the valve reduces opening to throttle gas flow and suppress suction pulsation. During maximum displacement operation, the valve increases opening to eliminate throttle effect and maintain high compressor performance. This dynamic adaptation resolves the contradiction between vibration reduction and performance maintenance.
Solution Approach 2:
The system changes the opening degree parameter of the suction passage valve according to displacement conditions. By varying this parameter (opening degree) between small and large values depending on operating state, the system achieves both vibration suppression during small displacement and performance maintenance during maximum displacement, eliminating the need to prioritize one effect over the other.
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 reduces vibration and noise by maintaining performance during maximum displacement and achieving sufficient throttling during small displacement operations, thereby addressing the issues of suction pressure fluctuation and noise propagation.
Implementation Method 1
an opening control valve arranged in the suction passage and adapted to adjust the opening of the suction passage based on a pressure difference between a suction pressure in the suction port and the crank chamber pressure
Data Source
AI summary
A variable displacement compressor in which variable control of displacement is effected through adjustment of a crank chamber pressure, includes: a suction port; a suction chamber; a suction passage establishing communication between the suction port and the suction chamber; and an opening control valve arranged in the suction passage and adapted to adjust the opening of the suction passage based on a pressure difference between a suction pressure in the suction port and the crank chamber pressure.