Capacity Control Valve Rod Mechanism for Coolant Discharge Stability
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Solution Overview
Problem
Conventional capacity control valves for variable capacity compressors face challenges in efficiently discharging liquid coolant during startup, leading to increased engine load and reduced energy efficiency, as they prioritize quick discharge over stable valve control and engine load management.
Innovation Solution
The capacity control valve includes a valve main body with specific communication passages, a solenoid-driven rod, and biasing members to maintain a stable main valve opening degree, ensuring efficient coolant discharge regardless of suction chamber pressure and reducing compressor drive force during liquid coolant discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the conventional capacity control valve discharges liquid coolant by opening the third valve portion, then the liquid coolant can be discharged from the control chamber, but the opening degree decreases as pressure lowers causing slow discharge rate
Solution Approach 1:
The patent introduces a rod as an intermediary component that directly controls the third valve portion's opening degree. The rod receives drive force from the solenoid and transmits it to maintain a substantially fully open state of the third valve portion throughout the discharge process, decoupling the valve opening degree from pressure changes and ensuring consistent high discharge rate.
2Productivity
If the compressor discharges liquid coolant quickly by opening the third valve portion, then the cooling operation can be restored, but the engine load increases reducing energy efficiency
Solution Approach 1:
The rod acts as a mediator between the solenoid and the third valve portion, enabling precise control of the valve opening degree. By maintaining the third valve portion in a substantially fully open state, the system achieves quick coolant discharge while optimizing the balance between discharge efficiency and engine load, thereby improving energy efficiency.
3Speed
If the main valve opening degree is not stabilized, then the valve can respond quickly to pressure changes, but the control precision and reliability of capacity control deteriorates
Solution Approach 1:
The patent segments the valve control into two independent parts: the main valve (first valve portion) controlled by pressure-sensitive body for responsive pressure adaptation, and the third valve portion controlled by the rod for stable fully-open maintenance during discharge. This segmentation allows each valve to optimize its function independently, ensuring both quick response and reliable control.
Solution Approach 2:
The rod serves as a stable control intermediary for the third valve portion, maintaining it in a substantially fully open state during liquid coolant discharge. This stable control foundation allows the main valve to respond quickly to pressure changes without compromising overall system reliability.
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
This configuration allows for stable and efficient liquid coolant discharge, reducing engine load and improving energy efficiency by maintaining a fully open auxiliary valve state and reliably controlling the main valve, thus enabling a quick transition to cooling operation.
Implementation Method 1
a solenoid that drives a rod having an auxiliary valve seat... a solenoid portion which applies electromagnetic drive force to the valve element
Implementation Method 2
a pressure-sensitive body 178 arranged in the third valve chamber, the pressure-sensitive body to be extended and contracted by peripheral pressure
Data Source
AI summary
A capacity control valve (1) includes a valve main body (10) having a first communication passage (11), a second communication passage (12), a third communication passage (13), and a main valve seat (15a), a valve element (20) having an intermediate communication passage (29), a main valve portion (21c), and an auxiliary valve portion (23d), a solenoid (30) that drives a rod (36) having an auxiliary valve seat (26c), and a first biasing member (43) that biases in the valve closing direction of the main valve portion (21c). The rod (36) is relatively moved with respect to the valve element (20) so as to open and close the auxiliary valve portion. The capacity control valve can efficiently discharge a liquid coolant irrespective of pressure of a suction chamber and lower drive force of a compressor at a liquid coolant discharging operation.