Capacity Control Valve Using Pressure Differential for Fast Response
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Solution Overview
Problem
Existing capacity control valves for variable displacement compressors take time to adjust to target control pressure during radical output changes in air conditioning systems, due to their reliance on suction pressure alone for adjusting the CS valve opening degree.
Innovation Solution
A capacity control valve with a pressure sensitive body that is extendable and contractible in the axial direction, allowing for precise adjustment of the CS valve opening degree by utilizing the pressure difference between suction pressure and control pressure, thereby enabling high responsiveness to radical output changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pressure sensitive body is extendable and contractible based only on suction pressure, then the structure is simple, but the responsiveness to radical output changes is slow
Solution Approach 1:
The pressure sensitive body acts as an intermediary mechanism that translates pressure differences between suction pressure and control pressure into mechanical displacement. This mediator converts the pressure differential signal into direct mechanical action on the CS valve, enabling rapid responsiveness without complex electronic control systems.
Solution Approach 2:
The invention utilizes pneumatic principles by introducing both suction pressure and control pressure into the pressure sensitive body, which then expands or contracts based on the pressure differential. This pneumatic actuation mechanism provides fast, direct mechanical response to pressure changes, improving responsiveness to radical output changes.
2Measurement precision
If the pressure sensitive body uses only suction pressure for adjustment, then the control mechanism is simple, but the precision of control pressure adjustment is insufficient
Solution Approach 1:
The pressure sensitive body balances suction pressure and control pressure against each other, with the pressure difference creating a net force that drives the adjustment mechanism. This counterbalancing approach allows precise detection of pressure differentials and enables fine control of the CS valve opening degree.
Solution Approach 2:
The invention changes the operating parameters of the pressure sensitive body by introducing dual pressure inputs (suction pressure and control pressure) instead of a single pressure source. This parameter change enables the system to detect and respond to pressure differentials with high precision, achieving accurate control pressure adjustment.
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 proposed solution allows for high precision and rapid adjustment of the variable displacement compressor to target control pressure, even during radical output changes, enhancing the responsiveness of the air conditioning system.
Implementation Method 1
a valve element is moved in the axial direction by electromagnetic force generated in a solenoid
Implementation Method 2
the pressure sensitive body is extendable and contractible in accordance with suction pressure Ps... adjust the control pressure Pc by a pressure difference between the suction pressure Ps and the control pressure Pc
Data Source
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AI summary
A capacity control valve having high responsiveness even upon a radical output change is provided. A capacity control valve includes a valve housing 10 provided with a suction fluid supply chamber 16 to which a suction fluid of suction pressure Ps is supplied, and a control fluid supply chamber 17 to which a control fluid of control pressure Pc is supplied, a CS valve 50 formed by a CS valve element 51 driven in the axial direction by a solenoid 80, and a CS valve seat 10a which is provided in a communication passage 14 between the control fluid supply chamber 17 and the suction fluid supply chamber 16, the CS valve being connectable to and separable from the CS valve seat 10a, and a pressure drive portion 61 arranged in the control fluid supply chamber 17 in a sealed manner and biasing the CS valve element 51 in the opposite direction to the driving direction by the solenoid 80. The control fluid is introduced on one side of the pressure drive portion 61, and the suction fluid is introduced on the other side.