Capacity Control Valve for Rapid Liquid Refrigerant Discharge
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Solution Overview
Problem
Conventional capacity control valves for variable capacity compressors face challenges in efficiently discharging liquid refrigerant after long-term standby, leading to prolonged startup times and increased engine load, which affects energy efficiency.
Innovation Solution
A capacity control valve design featuring a valve main body with multiple communication passages, a solenoid-driven rod, and biasing members to maintain the auxiliary valve open throughout the discharge process, ensuring efficient liquid refrigerant discharge and reducing compressor load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the conventional capacity control valve is used to discharge liquid refrigerant after long-time standing, then the liquid refrigerant can be discharged from the control chamber, but the discharge process takes a long time because the valve opening is reduced as discharge progresses
Solution Approach 1:
The patent employs a pressure-sensitive body (bellows) that dynamically adjusts the valve opening based on the control chamber pressure. As pressure decreases during discharge, the bellows contracts to maintain optimal valve opening, ensuring consistent high discharge rate throughout the process rather than the conventional fixed opening that reduces effectiveness as pressure drops.
Solution Approach 2:
The invention changes the operating parameters by using the pressure-sensitive body to automatically adjust valve opening in response to pressure changes. This dynamic parameter adjustment ensures the valve remains optimally open throughout the discharge process, solving the problem of reduced discharge rate as pressure decreases.
2Speed
If the liquid refrigerant is discharged quickly by opening the valve fully, then the discharge speed increases, but the engine load increases significantly
Solution Approach 1:
The pressure-sensitive body acts as a feedback mechanism that responds to control chamber pressure changes. As pressure decreases during discharge, the bellows contracts to reduce valve opening, automatically modulating the discharge rate to match system needs and prevent excessive engine load while maintaining efficient discharge.
Solution Approach 2:
The system uses its own pressure conditions to automatically control the valve opening through the pressure-sensitive body. The bellows self-regulates the discharge process based on internal pressure changes, eliminating the need for external control mechanisms and optimizing both discharge speed and energy consumption.
3Productivity
If the compressor is started after long-time standing with liquid refrigerant in the control chamber, then the discharge rate cannot be secured, but stopping the compressor to discharge refrigerant takes time
Solution Approach 1:
The patent enables preliminary discharge action by allowing the valve to be opened before the compressor reaches full operation. The pressure-sensitive body responds immediately to pressure changes, enabling rapid discharge of liquid refrigerant right at startup without waiting for the compressor to build up pressure, thus securing discharge rate while minimizing startup time loss.
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 the engine load and minimizing startup time, thereby improving energy efficiency and operational speed.
Implementation Method 1
a solenoid section 190 for exerting an electromagnetic driving force on the valve body 181
Implementation Method 2
a pressure-sensitive body 178 which is arranged in the third valve chamber to extend and contract by ambient pressure
Implementation Method 3
the liquid refrigerant is discharged to the discharge chamber via the suction chamber out of the control chamber (crank chamber) through the auxiliary communication passage 185, a communication passage 186 and the circulation groove 172 from the third valve chamber 184 and is vaporized rapidly
Data Source
AI summary
A capacity control valve, which can efficiently discharge a liquid refrigerant and reduce the driving force of a compressor, includes: a valve main body (10) including a first communication passage (11), a second communication passage (12), a third communication passage (13) and a main valve seat (15a); a valve body (20) including an intermediate communication passage (29), a main valve part (21c) and an auxiliary valve part (23d); a solenoid (30) which drives a rod (36) having an auxiliary valve seat (26c); a first biasing member (43) which biases the main valve part (21c) in the valve closing direction thereof; and a second biasing member (37) which biases the main valve part (21c) in the valve opening direction thereof, and the rod (36) relatively moves to the valve body (20), and opens and closes the auxiliary valve part (23d).