Pilot-Controlled Capacity Valve With Differential Pressure Actuation
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Solution Overview
Problem
Existing capacity control valves for variable displacement compressors in air conditioning systems face challenges in achieving high energy efficiency while maintaining a compact size, as they require larger solenoids and valve openings to increase refrigerant flow rate, leading to energy inefficiency and size constraints.
Innovation Solution
A capacity control valve design featuring a solenoid-driven pilot valve that creates a differential pressure to reduce solenoid driving power, a CS valve with a piston shape and elastic seal for improved sealing, and a compact configuration allowing adjustable opening degrees and fluid circulation, enhancing energy efficiency and responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the solenoid, valve body, and valve opening diameter are enlarged to increase the refrigerant flow rate, then the capacity control valve can achieve higher flow rates, but the device size increases and energy efficiency deteriorates
Solution Approach 1:
A pilot valve is introduced as an intermediary component to control the main CS valve. The pilot valve, driven by a small solenoid, regulates control pressure Pc that acts on the CS valve body, enabling the main valve to achieve large opening degrees and high refrigerant flow rates without requiring a large solenoid. This two-stage control mechanism allows a compact solenoid to indirectly control a large-capacity valve.
Solution Approach 2:
The invention uses control pressure Pc supplied from a discharge chamber to the CS valve body to drive the main valve opening. By utilizing hydraulic/pneumatic force from the control pressure acting on the large-area CS valve body, the system achieves large valve opening degrees and high flow rates without requiring a large electromagnetic force from the solenoid, thereby improving energy efficiency.
2Productivity
If the solenoid, valve body, and valve opening diameter are enlarged to increase the refrigerant flow rate, then the capacity control valve can achieve larger capacity, but the valve size increases
Solution Approach 1:
The valve system is segmented into two independent parts: a small pilot valve driven by a compact solenoid, and a large CS valve that performs the main refrigerant flow control. The pilot valve body and CS valve body are separate components, allowing the solenoid to remain small while the CS valve can be optimized for large flow capacity.
Solution Approach 2:
The pilot valve acts as an intermediary that translates small electromagnetic actuation into large CS valve opening. This allows the main valve body to be sized for optimal flow capacity rather than being constrained by solenoid size, achieving compact overall design with large refrigerant flow capability.
3Speed
If prompt temperature control is required with large refrigerant flow rate changes, then the system responsiveness improves, but the solenoid and valve components must be enlarged
Solution Approach 1:
The pilot valve serves as a responsive intermediary that可以快速 respond to control signals from the small solenoid, rapidly adjusting control pressure Pc. This rapid pressure adjustment quickly moves the large CS valve to the desired opening degree, achieving prompt temperature control and high system responsiveness without requiring a large solenoid.
Solution Approach 2:
The system uses dynamic control pressure Pc that can be rapidly adjusted by the pilot valve in response to solenoid actuation. This dynamic pressure control enables the large CS valve to respond quickly to changing temperature requirements, achieving high responsiveness despite the large valve size.
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 solution enables efficient control of refrigerant flow rate with reduced energy consumption and compact design, allowing for prompt temperature adjustments and improved system responsiveness.
Implementation Method 1
a pilot valve to be driven by the solenoid
Implementation Method 2
a CS valve formed of a CS valve body that partitions an inside of the valve housing into a first space and a second space and moves according to the suction pressure of the suction fluid and the control pressure of the control fluid
Implementation Method 3
a biasing member that biases the CS valve body in a valve closing direction of the CS valve
Data Source
AI summary
A capacity control valve includes valve housings to which a suction fluid of a suction pressure Ps and a control fluid of a control pressure Pc are supplied; a solenoid; a CS valve formed of a CS valve body that partitions an inside of the valve housings into a first space and a second space and moves according to the suction pressure Ps of the suction fluid and the control pressure Pc of the control fluid, and a CS valve seat with which the CS valve body is configured for coming into contact; a biasing member that biases the CS valve body in a valve closing direction of the CS valve; and a pilot valve formed of a pilot valve body to be driven by the solenoid and a pilot valve seat with which the pilot valve body is configured for coming into contact.