Capacity Control Valve With Auxiliary Valve Hold-Open for Startup Discharge
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Solution Overview
Problem
Conventional swash plate type variable capacity compressors face inefficiencies in liquid refrigerant discharge, leading to increased engine load and decreased energy efficiency during startup after prolonged inactivity, as the discharge process is not optimized to manage pressure changes effectively.
Innovation Solution
A capacity control valve design that maintains the auxiliary valve portion in a fully open state throughout the liquid refrigerant discharge, utilizing a solenoid-driven rod and biasing members to control the main and auxiliary valve portions, ensuring efficient discharge regardless of pressure changes and reducing engine load by balancing forces to minimize compressor load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the conventional capacity control valve allows the auxiliary valve portion to close during liquid refrigerant discharge, then the valve can respond to pressure changes, but the discharge efficiency decreases and engine load increases
Solution Approach 1:
The patent applies dynamics by making the auxiliary valve portion dynamically adjustable through a solenoid actuator. The valve can be controlled to remain fully open during liquid refrigerant discharge, allowing optimization of discharge efficiency while the main valve portion dynamically responds to pressure changes. This dynamic control resolves the contradiction by separating the functions of rapid discharge (auxiliary valve) and pressure regulation (main valve).
Solution Approach 2:
The patent segments the valve into two distinct portions: a main valve portion that responds to pressure changes for normal operation, and an auxiliary valve portion that remains fully open during liquid refrigerant discharge to maximize discharge efficiency. This segmentation allows each valve portion to independently optimize its function, resolving the contradiction between discharge efficiency and energy consumption.
2Speed
If the auxiliary valve portion closes in response to pressure changes during liquid refrigerant discharge, then pressure control is maintained, but the discharge process is delayed and compressor startup is slower
Solution Approach 1:
The solenoid actuator dynamically controls the auxiliary valve portion to remain fully open during liquid refrigerant discharge, eliminating delays caused by pressure-responsive closing. This dynamic control prioritizes rapid discharge and quick compressor startup, resolving the contradiction between startup speed and discharge time by decoupling the auxiliary valve from pressure-responsive operation.
Solution Approach 2:
The system performs preliminary action by opening the auxiliary valve portion before liquid refrigerant discharge begins and keeping it fully open throughout the discharge process. This preliminary positioning of the auxiliary valve ensures maximum discharge efficiency from the start, reducing both discharge time and compressor startup time.
3Reliability
If the valve design allows pressure-sensitive closing of the auxiliary valve, then pressure regulation is achieved, but the discharge efficiency decreases and energy efficiency is reduced
Solution Approach 1:
The patent segments the pressure control function from the discharge function by assigning pressure-sensitive operation to the main valve portion while keeping the auxiliary valve portion under solenoid control. This segmentation allows reliable pressure control to be maintained through the main valve while the auxiliary valve optimizes discharge efficiency without being constrained by pressure changes, resolving the contradiction between reliability and energy loss.
Solution Approach 2:
The solenoid actuator serves as an intermediary that decouples the auxiliary valve portion from direct pressure-sensitive operation. This intermediary control allows the auxiliary valve to remain fully open during discharge, improving energy efficiency, while the main valve portion maintains pressure control reliability through its pressure-responsive design.
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 rapid and efficient discharge of liquid refrigerant, reducing engine load and improving energy efficiency by maintaining optimal valve openings throughout the discharge process, thus facilitating quicker compressor startup and operation.
Implementation Method 1
a solenoid unit 190 that exerts an electromagnetic driving force on the valve element 181
Implementation Method 2
a pressure-sensitive element 178 that is arranged in the third valve chest to extend and contract with an ambient pressure
Data Source
AI summary
A capacity control valve includes: a valve body (10) including first communication passages (11), second communication passages (12), third communication passages (13), and a main valve seat (15a); a valve element (21) including an intermediate communication passage (29), a main valve portion (21b), and an auxiliary valve portion 21c; a solenoid (30) that drives a rod (36) provided with an auxiliary valve seat (23c); a first biasing member (43) that biases in a valve closing direction of the main valve portion (21b); and a second biasing member (44) that biases in a valve closing direction of the auxiliary valve portion (21c), wherein the rod (36) moves relative to the valve element (21) to open and close the auxiliary valve portion (21c). The capacity control valve allows a liquid refrigerant to be efficiently discharged and allows a driving force of a compressor to be decreased.