Solenoid Capacity Control Valve for Compressor Pressure Modulation
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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 with a solenoid-driven configuration, featuring a CS valve and a DC valve that transition in opposite directions at low energization, with the CS valve being primary and the DC valve auxiliary, allowing for finer control of the control pressure through cooperative operation.
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 or discharge chamber, then the valve configuration remains simple, but the controllability of the control pressure is insufficient
Solution Approach 1:
The patent replaces the stationary orifice with a movable valve body that can dynamically adjust the flow path sectional area. The valve body moves axially to change the opening area of the communication hole, transforming the static flow control system into a dynamic one that can precisely regulate control pressure according to operational requirements.
Solution Approach 2:
The patent divides the single valve body into multiple functional sections: a first valve body controlling the communication hole between discharge chamber and control chamber, and a second valve body controlling the communication hole between suction chamber and control chamber. This segmentation allows independent control of pressure pathways, enhancing overall controllability while maintaining reasonable structural complexity.
2Productivity
If only a single main valve (CS valve or DC valve) is used for control, then the device structure remains simple, but the control efficiency is suboptimal
Solution Approach 1:
The patent merges the functions of CS valve and DC valve into a single integrated valve body structure. Both valves share common components including the valve body, valve spring, and actuating mechanism, while maintaining separate control pathways. This combination reduces the total number of independent components, simplifies the overall structure, and enables coordinated control action that improves control efficiency compared to separate valve implementations.
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 enhances control pressure management, providing broader control ranges and improved efficiency in adjusting the refrigerant flow rate, thereby optimizing the cooling capacity of air-conditioning systems.
Implementation Method 1
a rod arranged in the valve housing and driven by the solenoid; as the energization of the solenoid becomes larger, the CS valve transitions from a closed state to an open state
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 arranged in the valve housing and driven by a solenoid, a CS valve 50 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 the movement of the rod. In a non-energization state of the solenoid, the CS valve is closed and the DC valve is opened. As the energization of the solenoid becomes larger, the CS valve transitions from a closed state to an open state, and the DC valve is throttled from an open state and thereafter transitions to the open state.