Capacity Control Valve With Dynamic CS Valve for Precise Compressor Control
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Solution Overview
Problem
Existing capacity control valves for variable displacement compressors suffer from poor control precision and energy efficiency due to the continuous communication between the suction and control ports, leading to unnecessary fluid discharge during normal operation.
Innovation Solution
A capacity control valve design that includes a CS valve controlled by dynamic pressure from the discharge fluid, preventing control fluid discharge from the suction port during normal operation, and utilizing a pressure drive valve for efficient startup fluid discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an auxiliary communication passage is provided to discharge liquefied fluid from the control chamber at startup, then the discharge speed of liquefied fluid is improved, but control precision and energy efficiency deteriorate during normal operation
Solution Approach 1:
The patent applies the dynamics principle by making the auxiliary communication passage dynamically controllable through a CS valve. The valve opens during startup to discharge liquefied fluid quickly, then closes during normal operation to maintain control precision. The valve's opening/closing state changes based on operational conditions, transforming a static structure into a dynamic one that adapts to different operational phases.
Solution Approach 2:
The patent applies preliminary action by providing a communication passage that is prepared in advance but remains closed during normal operation. The passage is activated only when needed (during startup with liquefied fluid), allowing the system to maintain optimal control precision during normal operation while having the capability to rapidly discharge fluid when required.
2Quantity of substance
If the auxiliary communication passage is always open to discharge fluid, then the discharge amount of liquefied fluid is improved, but energy efficiency deteriorates due to continuous fluid flow
Solution Approach 1:
The auxiliary communication passage is made dynamic through the CS valve mechanism. It transitions from a continuously open state to a controllably open/closed state. The valve opens only when liquefied fluid needs to be discharged and closes during normal operation, thereby maintaining high discharge capability when needed while eliminating continuous energy loss.
Solution Approach 2:
The harmful continuous fluid flow is extracted/separated from the normal operation mode. The CS valve isolates the auxiliary communication passage during normal operation, preventing unnecessary fluid flow and energy loss, while allowing rapid discharge when liquefied fluid is present.
3Measurement precision
If a CS valve is introduced to control the auxiliary communication passage, then control precision and energy efficiency are improved, but device complexity increases
Solution Approach 1:
The patent merges the CS valve functionality with the existing auxiliary communication passage structure. The valve is integrated into the communication passage, sharing the same housing and fluid pathways. This merging approach adds control capability while minimizing the increase in overall device complexity by utilizing existing structural elements.
Solution Approach 2:
The CS valve serves multiple functions: it controls the auxiliary communication passage, responds to pressure differential forces, and works in conjunction with the main valve element. By making the valve multi-functional, the patent reduces the need for separate control mechanisms, thereby limiting the increase in device complexity.
4Speed
If the main valve is opened to allow fluid flow, then the capacity control response is improved, but control fluid is discharged through the suction port reducing control precision
Solution Approach 1:
The CS valve provides dynamic control of the auxiliary communication passage based on the main valve state. When the main valve opens, the CS valve responds to pressure differential forces to control fluid flow direction, preventing control fluid from discharging through the suction port while maintaining rapid capacity control response.
Solution Approach 2:
The CS valve acts as an intermediary between the main valve and the auxiliary communication passage. It mediates the fluid flow by responding to pressure differential forces generated by main valve operation, directing control fluid appropriately and preventing it from discharge through the suction port, thereby maintaining control precision during rapid response operations.
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
Enhances control precision and energy efficiency by maintaining control pressure and suction pressure balance, ensuring high control precision and efficient operation during normal conditions and rapid startup responsiveness.
Implementation Method 1
a main valve element to be moved in the axial direction by electromagnetic force generated in a solenoid
Implementation Method 2
a pressure sensitive body arranged in the third valve chamber, the pressure sensitive body that applies bias force in the valve opening direction of a main valve to the main valve element in accordance with surrounding fluid pressure
Implementation Method 3
a CS valve provided between the control port and the suction port and controlled by a dynamic pressure of a fluid flowing from the discharge port to the control port at an opening state of the main valve
Data Source
AI summary
A capacity control valve includes a valve housing provided a discharge port through which a discharge fluid of discharge pressure Pd passes, a suction port through which a suction fluid of suction pressure Ps passes, and a control port through which a control fluid of control pressure Pc passes, a rod configured to be driven by a solenoid, a main valve formed by a main valve seat and a main valve element and configured for opening and closing a communication between the discharge port and the control port in accordance with a movement of the rod, and a CS valve provided between the control port and the suction port and controlled by a dynamic pressure of a fluid flowing from the discharge port to the control port at an opening state of the main valve.