Variable Displacement Swash Plate Compressor Orifice Control
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Solution Overview
Problem
Conventional variable displacement swash plate type compressors face challenges in achieving rapid control of refrigerant discharge amount while maintaining compressor efficiency, and they require increased time to switch to the maximum mode.
Innovation Solution
The compressor incorporates an orifice control mechanism that adjusts the effective flow cross-sectional area of the orifice hole based on differential pressure, allowing the area to change from zero to a first area and then to a second area, enabling rapid control of refrigerant discharge and reducing switching time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the effective flow cross-sectional area of the orifice hole is increased to enable rapid control of refrigerant discharge, then the responsiveness is improved, but the compressor efficiency is reduced due to excessive refrigerant leakage
Solution Approach 1:
The patent applies the dynamics principle by making the orifice hole's effective flow cross-sectional area variable rather than fixed. The orifice control mechanism dynamically adjusts the opening area based on operating conditions, allowing the system to have a large opening area when rapid discharge control is needed and a small opening area when efficiency is prioritized, thus resolving the contradiction between responsiveness and energy loss
Solution Approach 2:
The patent changes the parameter of the orifice hole's effective flow cross-sectional area from a constant value to a variable value that can be adjusted according to different operating modes. This parameter change enables the system to optimize performance by having different opening areas suitable for different operational requirements, addressing both the need for rapid control and the need to maintain efficiency
2Loss of energy
If the effective flow cross-sectional area of the orifice hole is kept small to maintain compressor efficiency, then energy loss is reduced, but the time required to switch to maximum mode is increased
Solution Approach 1:
The dynamics principle is applied by enabling the orifice hole's effective flow cross-sectional area to change dynamically based on operational requirements. When rapid switching to maximum mode is needed, the orifice control mechanism increases the opening area, thereby reducing the switching time without permanently compromising compressor efficiency under normal operating conditions
3Productivity
If a fixed orifice hole with large cross-sectional area is used to enable rapid refrigerant discharge control, then the responsiveness is improved, but the compressor efficiency is significantly reduced due to refrigerant leakage
Solution Approach 1:
The patent transforms the fixed orifice hole into a dynamic one whose effective flow cross-sectional area can be adjusted. The orifice control mechanism allows the system to have a large effective area when rapid discharge control is needed for high productivity, and a small effective area when efficiency is the priority, thus resolving the contradiction between productivity and energy loss
Solution Approach 2:
The parameter of the orifice hole's effective flow cross-sectional area is changed from fixed to variable. This parameter change enables the system to optimize the balance between refrigerant discharge control capability and compressor efficiency by adjusting the effective area according to different operational modes and requirements
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 allows for simultaneous rapid control of refrigerant discharge and prevention of efficiency reduction, while also reducing the time required to switch to the maximum mode, by dynamically adjusting the orifice hole's effective flow area in response to pressure changes.
Implementation Method 1
An orifice hole (460) which decompresses a fluid passing through the second flow path (450) is formed in the second flow path (450)
Data Source
AI summary
Variable displacement swash plate type compressor includes casing, rotating shaft, swash plate, piston, and inclination adjustment mechanism with first flow path connecting discharge chamber with crankcase and second flow path connecting crankcase with suction chamber to adjust inclination angle of the swash plate. An orifice hole decompressing fluid passing through the second flow path is formed in the second flow path. An orifice control mechanism controlling effective flow cross-sectional area of the orifice hole is formed on the second flow path. The orifice hole and control mechanism are formed to increase differential pressure in the crankcase and suction chamber, the effective flow cross-sectional area increases, and with further differential pressure increase it becomes a second area larger than zero and less than the first area. Achieved is rapid control of refrigerant discharge amount and prevention of reduction in compressor efficiency with reduction of time to switch to the maximum mode.