Capacity Control Valve With Second Plunger for Compressor Startup Flow
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Solution Overview
Problem
In swash plate type variable capacity compressors, the accumulation of liquid refrigerant during long-term standing prevents immediate discharge upon startup, leading to inefficiencies in capacity control and operation due to continuous communication between the control and suction chambers, which reduces the compressor's operational efficiency.
Innovation Solution
A capacity control valve design that includes a second plunger to regulate the intermediate communication passage between the first and third valve chambers, allowing for adjustable flow and improved efficiency by narrowing the flow passage with auxiliary communication holes and plunger configurations, ensuring efficient discharge of liquid refrigerant and optimal control chamber pressure management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control chamber and suction chamber are continuously communicated, then the compressor can operate smoothly, but liquid refrigerant accumulates in the control chamber during standing periods preventing immediate discharge upon startup
Solution Approach 1:
The patent applies the dynamics principle by making the communication state between the control chamber and suction chamber variable rather than fixed. The intermediate communication passage is equipped with a second valve part that can dynamically open or close based on operating conditions. During standing periods, the passage remains closed to prevent liquid refrigerant accumulation, while during normal operation, it opens to maintain smooth compressor operation by allowing pressure equalization.
Solution Approach 2:
The patent segments the communication pathway between the control chamber and suction chamber by introducing an intermediate communication passage with a separate valve control mechanism. This segmentation allows independent control of refrigerant flow between chambers, enabling the system to prevent liquid accumulation in the control chamber during standing periods while maintaining operational smoothness during active compression cycles.
2Reliability
If the intermediate communication passage is always open, then pressure control is maintained, but liquid refrigerant flows from the control chamber to the suction chamber reducing operational efficiency
Solution Approach 1:
The intermediate communication passage is designed with a second valve part that dynamically controls its opening state based on system conditions. During standing periods, the valve closes to prevent liquid refrigerant flow that would reduce efficiency. During normal operation, the valve opens to maintain pressure control stability, thus dynamically balancing between the two competing requirements.
Solution Approach 2:
The second valve part is controlled by a solenoid that responds to system pressure and flow conditions, enabling the intermediate communication passage to automatically regulate its own state. The system self-adjusts to prevent liquid refrigerant migration during standing while maintaining pressure equilibrium during operation, without requiring external intervention.
3Productivity
If a second plunger is added to regulate the intermediate communication passage, then flow control is improved, but device complexity increases
Solution Approach 1:
The patent merges the function of the second plunger with the existing valve body structure. The second plunger is integrated into the valve assembly and works in conjunction with the solenoid control system that already manages the first valve part. This merging approach allows flow control precision to be improved while minimizing the increase in overall device complexity by reusing existing structural elements and control mechanisms.
Solution Approach 2:
The second plunger serves multiple functions: it regulates the intermediate communication passage, controls liquid refrigerant flow prevention, and works in coordination with the first valve part for overall pressure management. By making this component multi-functional, the patent achieves improved flow control precision without proportionally increasing device complexity, as a single component performs multiple critical tasks.
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 improved valve design enhances the operational efficiency of the variable capacity compressor by ensuring rapid discharge of liquid refrigerant and precise control of chamber pressures, thereby maintaining efficient operation and responsiveness during startup and normal operation.
Implementation Method 1
a solenoid section 190 for exerting an electromagnetic driving force on the valve body 181
Implementation Method 2
a pressure-sensitive body 178 which is arranged in the third valve chamber to extend and contract by ambient pressure
Data Source
AI summary
A capacity control valve for controlling a flow rate or pressure of a variable capacity compressor includes: a valve main body, a valve body arranged in the valve main body, a solenoid having a first plunger connected to the valve body, and a second plunger arranged between the solenoid and the valve body for regulating flow of the variable capacity compressor.