Capacity Control Valve for Fast Pc-Ps Pressure Balancing
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Solution Overview
Problem
The existing capacity control valve for variable displacement compressors faces inefficiency when operating at maximum capacity due to a fixed orifice communication between the control and suction chambers, which hinders prompt pressure equalization, leading to decreased operation efficiency.
Innovation Solution
A capacity control valve design incorporating a differential pressure valve that allows communication between the control pressure and suction pressure ports, maintained at equal pressure through a solenoid-driven main valve and pressure-sensitive valve, enhancing operation efficiency by ensuring balanced pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed orifice is used to communicate between the control chamber and suction chamber, then the structure is simple, but the pressure equalization is slow and operation efficiency decreases
Solution Approach 1:
The patent replaces the fixed orifice with a dynamically controllable communication path. A valve element can open or close the communication between the control chamber and suction chamber based on operational requirements, enabling fast pressure equalization when needed while maintaining simple structure through automated control rather than complex mechanical adjustments.
Solution Approach 2:
The patent substitutes the purely mechanical fixed orifice system with a controlled valve mechanism that can be actuated by pressure differential or external signals. This replacement enables the system to transition from static pressure control to dynamic pressure equalization, significantly reducing the time required to reach pressure equilibrium while maintaining structural simplicity through automated valve operation.
2Productivity
If the main valve is closed to maintain maximum capacity state, then the discharge amount is maximized, but the control chamber pressure cannot be promptly decreased
Solution Approach 1:
The patent divides the pressure control function into two independent pathways: the main valve for discharge control and a separate communication valve for pressure equalization. This segmentation allows the main valve to remain closed for maximum capacity operation while the communication valve independently manages pressure response in the control chamber, enabling both high discharge amount and fast pressure response simultaneously.
Solution Approach 2:
The patent introduces an intermediary communication path between the control chamber and suction chamber that can operate independently of the main valve. This intermediary pathway acts as a mediator to rapidly equalize pressures when needed, allowing the main valve to maintain maximum capacity state without being constrained by slow pressure response, thus resolving the contradiction between discharge amount and pressure response speed.
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 ensures reliable maintenance of equal control and suction pressures, thereby increasing the operation efficiency of the variable displacement compressor, particularly at maximum capacity states.
Implementation Method 1
a main valve element which includes a main valve portion capable of coming into contact with and separating from a main valve seat to close and open a communication between the Pd port and the Pc port by a drive force of a solenoid
Implementation Method 2
a differential pressure valve including a differential pressure valve element and being capable of opening and closing a communication between the Pc port and the second Ps port and a communication between the Pc port and a pressure-sensitive chamber by the differential pressure valve element moved by a pressure
Data Source
AI summary
A capacity control valve includes: a housing with a Pc port, a Pd port, a first Ps port and a second Ps port; a main valve element having a main valve portion adapted to contact with and separate from a main valve seat to close and open a communication between the Pd port and the Pc port by a drive force of a solenoid; an intermediate communication path communicating with the Pc port and the first Ps port; a pressure-sensitive valve configured to open and close the intermediate communication path by an ambient pressure; and a differential pressure valve including a differential pressure valve element configured to open and close a communication between the Pc port and the second Ps port and a communication between the Pc port and a pressure-sensitive chamber by the differential pressure valve element moved by a pressure.