Capacity Control Valve for Rapid 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 and maintaining control stability due to varying pressures and blow-by gases, leading to prolonged discharge times and instability.
Innovation Solution
The capacity control valve incorporates a valve main body with specific communication passages, a pressure-sensitive body, a solenoid-driven rod, and a restrictor mechanism with an adjustable intermediate communication passage to maintain a fully opened state for efficient coolant discharge and prevent pressure increases from blow-by gases, ensuring stable control chamber pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the capacity control valve uses a conventional design with communication between discharge chamber and control chamber, then the structure is simple, but the liquid coolant discharge time is prolonged and control stability deteriorates
Solution Approach 1:
The communication passage is segmented into multiple passages with different functions: a first communication passage for liquid coolant discharge and a second communication passage for blow-by gas venting. This segmentation allows independent optimization of each function, enabling rapid coolant discharge while maintaining control stability through separate gas management.
Solution Approach 2:
A third communication passage is introduced as an intermediary pathway connecting the control chamber to either the suction chamber or discharge chamber. This intermediary passage provides an additional route for pressure equalization and coolant discharge, reducing discharge time while preventing pressure buildup from blow-by gases.
2Productivity
If the capacity control valve allows communication between discharge chamber and control chamber, then the device complexity is low, but the discharge amount after startup cannot be ensured
Solution Approach 1:
The valve system dynamically controls communication pathways based on operational conditions. The third communication passage can be selectively activated or deactivated to establish different flow paths, enabling the system to adapt to varying discharge requirements while maintaining a relatively simple base structure.
Solution Approach 2:
The third communication passage serves multiple functions: it acts as an additional discharge pathway, a pressure equalization route, and a means to prevent liquid coolant accumulation. This multi-functionality increases discharge amount capability without proportionally increasing device complexity.
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 design enables efficient and rapid discharge of liquid coolant, maintaining control stability by maintaining the restrictor mechanism in a fully opened state and preventing pressure increases from blow-by gases, thus ensuring consistent discharge and operational efficiency.
Implementation Method 1
the pressure-sensitive body 178 arranged in the third valve chamber 184, the pressure-sensitive body to be extended and contracted by peripheral pressure
Implementation Method 2
a solenoid portion 190 which applies electromagnetic drive force to the valve element 181
Implementation Method 3
the high-pressure liquid coolant accumulated in the control chamber (crank chamber) flows into the third valve chamber 184 from the third communication passage 174
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 pressure-sensitive body (24), a valve element (20) having an intermediate communication passage (29), a main valve portion (21c), and a restrictor portion (25), and a solenoid (30) that drives a rod (36). The rod (36) is relatively moved with respect to the valve element (20) so as to control an opening degree of the restrictor portion (25). The capacity control valve is capable of efficiently discharging a liquid coolant irrespective of pressure of a suction chamber and improving control stability.