Capacity Control Valve With Dynamic CS Valve for Precise Pressure Control
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Solution Overview
Problem
Existing capacity control valves suffer from poor control precision and energy efficiency due to the continuous communication between the suction port and control port, leading to inefficient fluid discharge during normal operation.
Innovation Solution
A capacity control valve with a CS valve between the control port and suction port, controlled by dynamic pressure from the discharge fluid, preventing control fluid discharge from the suction port during normal operation, and utilizing a pressure drive valve for rapid fluid discharge during startup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the suction port and control port are continuously communicated to discharge liquefied fluid during startup, then the startup responsiveness is improved, but the control precision and energy efficiency deteriorate during normal operation
Solution Approach 1:
The patent applies the dynamics principle by making the communication state between the suction port and control port changeable rather than fixed. The third communication passage is configured to be open during startup to discharge liquefied fluid quickly, then closed during normal operation to maintain control precision. This dynamic state change allows the system to optimize performance for different operational phases.
Solution Approach 2:
The patent implements periodic action by sequentially opening and closing the third communication passage at different operational stages. During startup, the passage is open to rapidly discharge liquefied fluid from the control chamber. After startup completion, the passage is closed to prevent control fluid discharge and maintain stable control pressure. This periodic opening/closing pattern resolves the contradiction between startup responsiveness and normal operation precision.
2Productivity
If the third communication passage is always open to allow fluid discharge, then the startup performance is improved, but the energy efficiency deteriorates due to continuous control fluid discharge
Solution Approach 1:
The third communication passage transitions from a static always-open state to a dynamic state that opens only when needed during startup. This allows rapid discharge of liquefied fluid to improve startup performance, then closes during normal operation to prevent unnecessary control fluid discharge and maintain energy efficiency.
Solution Approach 2:
The patent extracts the startup-specific function from the continuous operation mode by isolating the third communication passage activation to only the startup phase. This separation allows the system to benefit from aggressive fluid discharge during startup without incurring continuous energy losses during normal operation, thereby resolving the contradiction between startup performance and energy efficiency.
3Ease of operation
If the main valve opens to allow fluid flow, then the capacity control is improved, but the control fluid is discharged through the suction port reducing control precision
Solution Approach 1:
The patent introduces the third communication passage as an intermediary mechanism that selectively controls fluid flow paths. During startup, it acts as a mediator to discharge liquefied fluid from the control chamber. During normal operation, it closes to prevent control fluid from being discharged through the suction port, thereby maintaining control precision while allowing the main valve to perform capacity control functions.
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
Enhances control precision and energy efficiency by maintaining control pressure and suction pressure balance, ensuring high control precision and efficient fluid management during normal operation and rapid startup responsiveness.
Implementation Method 1
a rod (83) to be driven by a solenoid (80); a main valve (50) formed by a main valve seat (10a) and a main valve element (51a) and configured for opening and closing a communication between the discharge port (12) and the control port (13) in accordance with a movement of the rod (83)
Implementation Method 2
a CS valve (56) provided between the control port (13) and the suction port (14) and controlled by a dynamic pressure of a fluid flowing from the discharge port (12) to the control port (13) at an opening state of the main valve (50)
Implementation Method 3
a spring (58) that biases the CS valve element (57) in a valve opening direction of the CS valve (56)
Data Source
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AI summary
A capacity control valve with which control precision at the time of normal control is high and energy efficiency is excellent is provided. A capacity control valve V includes a valve housing 10 provided a discharge port 12 through which a discharge fluid of discharge pressure Pd passes, a suction port 14 through which a suction fluid of suction pressure Ps passes, and a control port 13 through which a control fluid of control pressure Pc passes, a rod 83 configured to be driven by a solenoid 80, a main valve 50 formed by a main valve seat 10a and a main valve element 51 and configured for opening and closing a communication between the discharge port 12 and the control port 13 in accordance with a movement of the rod 83, and a CS valve 56 provided between the control port 13 and the suction port 14 and controlled by a dynamic pressure of a fluid flowing from the discharge port 12 to the control port 13 at an opening state of the main valve.