Spool Displacement Control Valve for Compressor Inlet Flow Control
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Solution Overview
Problem
Conventional variable displacement compressors experience reduced operational efficiency due to excessive fluid flow into the inlet chamber during continuous operation, leading to increased pressure and inefficiency.
Innovation Solution
A displacement control valve with a spool valve structure that controls the flow rate between the control and inlet chambers, limiting fluid flow into the inlet chamber and improving operational efficiency by simultaneously managing the flow rates between the discharge and control chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the auxiliary communication path is opened to quickly discharge fluid from the control chamber upon activation, then the control pressure is reduced more quickly, but fluid excessively flows into the inlet chamber during continuous operation, increasing pressure and reducing operational efficiency
Solution Approach 1:
The valve body is segmented into multiple functional parts: a first valve part for controlling the auxiliary communication path, a second valve part for controlling the inlet path, and a third valve part for controlling the discharge path. This segmentation allows independent control of fluid flow in different paths, enabling the auxiliary communication path to be opened for quick pressure reduction while the inlet path remains controlled to prevent excessive fluid flow during continuous operation.
Solution Approach 2:
The valve body is designed to reciprocate dynamically between different positions. In the first position, the auxiliary communication path is opened for quick discharge. In the second position, the inlet paths are opened while the auxiliary communication path is closed for continuous operation. This dynamic positioning resolves the contradiction by adapting the valve configuration to different operational requirements.
2Ease of operation
If the valve body is reciprocated to open inlet paths during activation, then fluid can flow into the control chamber, but this causes excessive fluid flow into the inlet chamber during continuous operation
Solution Approach 1:
The valve body dynamically switches between two operational states: during activation, it opens inlet paths to allow fluid flow for pressure equalization; during continuous operation, it closes inlet paths while opening discharge paths to prevent excessive fluid flow into the inlet chamber. This dynamic state switching resolves the contradiction between operational responsiveness and energy efficiency.
Solution Approach 2:
The valve body performs periodic reciprocation between different positions based on operational requirements. The first valve part periodically opens and closes the auxiliary communication path, while the second valve part periodically controls the inlet paths. This periodic action ensures quick response during activation while maintaining energy efficiency during continuous operation.
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 spool valve structure precisely controls the flow rate, reducing unwanted fluid flow into the inlet chamber and enhancing the operational efficiency of the variable displacement compressor.
Implementation Method 1
a solenoid that applies electromagnetic force to the valve body in the axial direction that closes the first valve part
Data Source
AI summary
A displacement control valve includes a housing a first, a second, and a third chamber; a valve body having a first reciprocating valve part that opens or closes discharge paths in the first chamber; and a solenoid that applies electromagnetic force to the valve body in the direction that closes the first valve part. The control valve has a spool valve part formed on the external circumference of the valve body and a spool seating part formed on the internal circumference of the valve housing and that is opened while the first valve part is closed and vice versa upon reciprocation of the valve body to control the rate of flow between a control chamber and an inlet chamber.