Swash Plate Compressor Variable Reed Orifice Refrigerant Loss
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Solution Overview
Problem
The efficiency of swash plate compressors deteriorates due to unnecessary loss of refrigerant gas through the orifice hole, even when the difference between control pressure and suction pressure is kept constant, leading to reduced compressor performance.
Innovation Solution
The swash plate compressor incorporates a variable reed system with a first and second orifice hole and an intermediate flow path, including a suction chamber pressure-maintaining space and buffer space, to minimize refrigerant loss by controlling the opening of the variable reed based on pressure differences, ensuring equal pressure in the suction chamber and maintaining space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single orifice hole is used to discharge refrigerant from the crank chamber to the suction chamber, then the structure is simple, but refrigerant loss increases due to unnecessary outflow even when pressure difference is constant
Solution Approach 1:
The single orifice hole is divided into two separate orifice holes: a first orifice hole for discharging leaked refrigerant and a second orifice hole for discharging control pressure refrigerant. This segmentation allows independent control of refrigerant flow paths, preventing unnecessary refrigerant loss while maintaining structural simplicity.
Solution Approach 2:
A reed valve is introduced as an intermediary component between the two orifice holes. The reed valve selectively opens or closes the first orifice hole based on the pressure difference between the crank chamber and suction chamber, mediating the refrigerant flow to eliminate unnecessary outflow while keeping the overall structure simple.
2Loss of substance
If the first orifice hole remains open to allow refrigerant discharge, then refrigerant loss is reduced, but compressor efficiency deteriorates due to delays in reed valve opening
Solution Approach 1:
The reed valve provides dynamic control of the first orifice hole opening based on real-time pressure conditions. When the pressure difference between the crank chamber and suction chamber exceeds a threshold, the reed valve opens to allow refrigerant discharge. When the pressure difference is maintained constant, the reed valve closes to prevent unnecessary refrigerant loss, thereby optimizing compressor efficiency.
Solution Approach 2:
The system changes the opening state parameter of the first orifice hole dynamically based on pressure difference parameters. By monitoring and responding to pressure changes, the reed valve adjusts the refrigerant flow path to prevent losses without causing efficiency deterioration.
3Loss of substance
If the reed valve opening is delayed due to pressure difference, then refrigerant discharge is controlled, but compressor performance deteriorates due to timing delays
Solution Approach 1:
The reed valve operates based on feedback from the pressure difference between the crank chamber and suction chamber. When the pressure difference indicates a need for refrigerant discharge, the reed valve responds by opening the first orifice hole. This feedback mechanism ensures timely valve operation that prevents refrigerant loss without causing performance-detrimental delays.
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 configuration reduces refrigerant loss and improves compressor efficiency by preventing delays in the opening of the variable reed, thereby optimizing controllability and reducing unnecessary outflow of refrigerant gas.
Implementation Method 1
a variable reed configured to open or close the first orifice hole according to a difference between a control pressure and a suction pressure
Implementation Method 2
a suction chamber pressure-maintaining space connected to the suction chamber and configured to maintain a pressure equal to a pressure in the suction chamber
Data Source
AI summary
A swash plate compressor includes a cylinder block accommodating a piston for compressing a refrigerant, a front housing coupled to the cylinder block and having a crank chamber, a rear housing having a suction chamber and a discharge chamber and coupled to the cylinder block, and a suction reed plate inserted between a valve plate and the cylinder block. The swash plate compressor includes: a first orifice hole through which the refrigerant in the crank chamber passes; a second orifice hole communicating between the first orifice hole and the suction chamber; an intermediate flow path configured to connect the first orifice hole and the second orifice hole; and the valve plate inserted into the rear housing and having a suction chamber pressure-maintaining space connected to the suction chamber and configured to maintain a pressure equal to a pressure in the suction chamber.