Dual-Valve Capacity Control for Faster Compressor Pressure Response
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Solution Overview
Problem
Existing capacity control valves for variable displacement compressors have limitations in controllability of the control pressure due to constant flow path sectional areas and lack of efficient cooperation between CS and DC valves, leading to suboptimal control efficiency.
Innovation Solution
A capacity control valve design that includes a solenoid-driven rod, CS valve, and DC valve, where the CS valve controls fluid flow between the suction port and first control port, and the DC valve controls fluid flow between the discharge port and second control port, with specific stroke and energization current-dependent transitions to enhance control pressure management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a stationary orifice with constant flow path sectional area is used to connect the control chamber to the suction/discharge chamber, then the valve configuration remains simple, but the controllability of the control pressure is insufficient
Solution Approach 1:
The single main valve is segmented into two separate valves: the CS valve (suction chamber connected to control chamber) and the DC valve (discharge chamber connected to control chamber). This segmentation allows independent control of pressure pathways, enabling finer adjustment of control pressure Pc while maintaining reasonable structural complexity through modular valve design.
Solution Approach 2:
The stationary orifice is replaced with dynamically controllable valve mechanisms. The CS valve and DC valve can dynamically open and close based on control signals, transforming the static flow path into a dynamic system that adapts to varying pressure control requirements, thereby significantly improving controllability.
2Productivity
If only a single main valve (CS valve or DC valve) is used for normal control, then the valve structure remains simple, but the control efficiency is suboptimal
Solution Approach 1:
The CS valve and DC valve are merged into a coordinated control system where both valves operate simultaneously under the control of a single solenoid. The solenoid's energization state controls both valves through a shared rod mechanism, combining their effects to achieve rapid and efficient control pressure adjustment while avoiding the need for completely separate control systems.
Solution Approach 2:
The rod acts as an intermediary mechanism that transmits the solenoid's electromagnetic force to both the CS valve and DC valve. This intermediary structure enables coordinated control of both valves through a single actuation point, improving control efficiency while maintaining a unified valve structure rather than requiring independent actuation mechanisms.
3Speed
If the DC valve is closed with maximum stroke of the rod, then the control pressure can be fully adjusted, but the control response time increases
Solution Approach 1:
The DC valve is designed to close with a predetermined stroke that is shorter than the maximum rod stroke, providing sufficient control pressure adjustment through partial closure. This partial action approach achieves the necessary control range without requiring full stroke movement, thereby reducing response time while maintaining adequate control authority.
Solution Approach 2:
The control function is segmented between the CS valve and DC valve, where the DC valve handles the primary control pressure adjustment through partial closure, and the CS valve provides supplementary control. This functional segmentation allows the DC valve to operate with reduced stroke for faster response while the CS valve compensates to maintain the full control range.
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 allows for improved control efficiency and quicker control of the control pressure by cooperative action of the CS and DC valves, providing broader control area and reliable operation, thus enhancing the performance of the air-conditioning system.
Implementation Method 1
the capacity control valve moves a valve body in an axial direction by electromagnetic force generated by a solenoid
Data Source
AI summary
A capacity control valve includes a valve housing formed with a discharge port, a suction port, and first and second control ports, a rod driven by a solenoid, a CS valve configured to control a fluid flow between the first control port and the suction port in accordance with a movement of the rod, and a DC valve configured to control a fluid flow between the second control port and the discharge port in accordance with a movement of the rod.