Capacity Control Valve Using Discharge Pressure for Faster Response
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Solution Overview
Problem
The existing capacity control valve in air conditioning systems takes time to reach a target control pressure due to the low influence of suction pressure on valve adjustments.
Innovation Solution
A capacity control valve with a pressure receiving portion that applies force from discharge pressure to adjust the valve opening degree, allowing for quicker control pressure adjustments, using a CS valve and solenoid-driven valve element with a spring bias and a sliding rod for enhanced responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure sensitive body with bellows is used to sense suction pressure and adjust valve opening degree, then manufacturing precision and control accuracy are improved, but device complexity and response time are worsened
Solution Approach 1:
The invention extracts and eliminates the complex pressure sensitive body with bellows from the valve structure. Instead of using a separate bellows mechanism to sense suction pressure, the patent directly utilizes the suction pressure acting on the valve element itself, thereby simplifying the overall valve structure while maintaining control precision.
Solution Approach 2:
The valve element is given multiple functions: it serves both as the closing member for the valve hole and as the pressure receiving surface for suction pressure. This eliminates the need for a separate pressure sensitive body, reducing device complexity while maintaining the ability to sense and respond to suction pressure changes.
2Measurement precision
If suction pressure is used to correct valve element actions, then control precision is improved, but response speed is worsened due to low pressure influence
Solution Approach 1:
The valve element is pre-designed with a pressure receiving surface that directly exposes it to suction pressure. This preliminary structural arrangement ensures that suction pressure acts on the valve element from the beginning, providing immediate corrective action without waiting for a separate pressure sensing and transmission mechanism to respond.
Solution Approach 2:
The valve element has different functional surfaces: one side faces the valve hole for closing action, while the other side has a pressure receiving surface specifically designed to receive suction pressure. This local differentiation allows the same component to perform both sealing and pressure-sensing functions with optimized characteristics for each.
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 faster achievement of target control pressure in air conditioning systems by utilizing high discharge pressure for valve correction, reducing the number of parts and size, and improving control characteristics.
Implementation Method 1
a valve element to be driven by a solenoid
Implementation Method 2
a spring that biases the valve element in a direction opposite to a driving direction by the solenoid
Implementation Method 3
a pressure receiving portion to which force in accordance with discharge pressure is applied in an axial direction of the valve element
Data Source
AI summary
A capacity control valve includes a valve housing provided with a suction port through which a suction fluid of suction pressure passes, and a control port through which a control fluid of control pressure passes, a valve element configured to be driven by a solenoid, a spring that biases the valve element in the direction opposite to the driving direction by the solenoid, and a CS valve formed by a CS valve seat and the valve element and configured for opening and closing a communication between the control port and the suction port by movement of the valve element. The capacity control valve further includes a pressure receiving portion to which force in accordance with discharge pressure is applied in the axial direction of the valve element.