Capacity Control Valve with Discharge Pressure Correction
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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, limiting the precision and speed of fluid discharge control.
Innovation Solution
A capacity control valve design that includes a valve housing with a suction port and control port, a solenoid-driven valve element, a spring for biasing, and a CS valve for pressure control, utilizing high discharge pressure to correct valve actions, allowing for quicker adjustment of control pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure sensitive body with bellows is provided to sense suction pressure and adjust valve opening degree, then manufacturing precision and control precision are improved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the pressure sensitive body with bellows from the valve structure. Instead of using a separate pressure sensing mechanism, the invention directly utilizes the suction pressure Ps acting on the valve element to influence its opening degree, thereby achieving control pressure adjustment without adding complex pressure sensing components.
Solution Approach 2:
The valve element serves multiple functions: it acts as both the closing element for the discharge port and the control element whose opening degree is adjusted by suction pressure. The suction pressure Ps directly influences the valve element's position, combining pressure sensing and valve control functions into a single component, thus reducing device complexity while maintaining control precision.
2Measurement precision
If suction pressure is used to adjust valve opening degree, then control precision is improved, but response speed deteriorates due to low pressure influence
Solution Approach 1:
The invention applies suction pressure Ps to the valve element in advance to preliminarily adjust its opening degree before the main control action. By pre-positioning the valve element using suction pressure, the system reduces the time required to reach target control pressure, improving response speed while maintaining the precision benefits of pressure-based control.
Solution Approach 2:
The valve element's opening degree is dynamically adjusted by the varying suction pressure Ps during compressor operation. As suction pressure changes with operating conditions, the valve element automatically adapts its position, enabling both precise control and fast response to changing system requirements without manual intervention or complex control mechanisms.
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 and more precise control of the valve opening degree, allowing the air conditioning system to reach target control pressure more quickly, reducing the need for additional pressure-sensitive components and simplifying the design.
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 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 a movement 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.