Capacity Control Valve Spring Layout for Faster Startup Discharge
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Solution Overview
Problem
The existing capacity control valve has poor responsiveness to differential pressure due to the delayed application of the spring's urging force to the pressure-sensitive body, leading to slow fluid discharge when starting the variable displacement compressor.
Innovation Solution
A capacity control valve design that includes a differential pressure valve body moved by first and second urging members within an accommodation portion, allowing the differential pressure valve to open promptly and assisting the pressure-sensitive valve's opening by transmitting the urging force through a second urging member, enhancing responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the differential pressure valve body is moved only by differential pressure in the adapter, then the structure is simple, but the responsiveness to differential pressure is poor
Solution Approach 1:
The first urging member (spring) is pre-compressed to store elastic potential energy before the differential pressure valve body needs to move. When differential pressure decreases, this pre-stored energy is released to quickly push the valve body open, achieving fast responsiveness without waiting for gradual pressure changes.
Solution Approach 2:
The second urging member transmits the urging force from the first urging member to the pressure-sensitive body, acting as an intermediary that couples the differential pressure valve mechanism with the pressure-sensitive valve mechanism, enabling coordinated operation and enhanced responsiveness.
2Speed
If the spring's urging force is applied only after the differential pressure valve body contacts the bottom portion of the adapter, then the structure is simple, but the pressure-sensitive valve opening is delayed
Solution Approach 1:
The second urging member serves as a mechanical intermediary that continuously transmits the spring's urging force to the pressure-sensitive body throughout the valve opening process, eliminating the delay caused by waiting for contact with the adapter bottom portion.
Solution Approach 2:
The spring is pre-compressed to generate urging force before the pressure-sensitive valve needs to open. This pre-applied force is continuously transmitted through the second urging member, enabling the pressure-sensitive valve to open immediately when conditions permit, rather than waiting for mechanical contact.
3Loss of time
If the differential pressure valve remains closed during normal operation, then the control pressure is maintained, but the fluid discharge time is excessive when starting
Solution Approach 1:
The differential pressure valve is designed to dynamically switch between closed and open states based on real-time differential pressure conditions. During normal operation, it remains closed to maintain control pressure. During startup when differential pressure decreases, it quickly opens to enable rapid fluid discharge, achieving adaptive response to different operational phases.
Solution Approach 2:
The valve system continuously monitors differential pressure and automatically adjusts the differential pressure valve state in response. When differential pressure drops below a threshold during startup, the valve opens to discharge fluid; when control pressure stabilizes, the valve closes to maintain pressure, creating a feedback-controlled discharge mechanism.
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 enhanced design improves the responsiveness of the capacity control valve to differential pressure, enabling faster fluid discharge during startup and maintaining efficient operation by ensuring the pressure-sensitive valve is assisted in opening, thus stabilizing the discharge process.
Implementation Method 1
a valve body which constitutes a primary valve element coming into contact with and separating from a primary valve seat to close and open a communication between the discharge port and the control port by a driving force of a solenoid
Implementation Method 2
a first urging member and a second urging member which are interposed in the accommodation portion of the adapter so as to sandwich the differential pressure valve body in an opening and closing direction of the differential pressure valve
Implementation Method 3
a pressure-sensitive valve disposed in a pressure of a pressure-sensitive chamber provided with the control port, the pressure-sensitive valve being constituted by a pressure sensitive body and a pressure-sensitive valve member
Data Source
AI summary
A capacity control valve V includes a valve housing, a primary valve opened and closed by a driving force of a solenoid, a pressure-sensitive valve disposed in a pressure-sensitive chamber, and a differential pressure valve opened and closed by a differential pressure valve body moved by a pressure. A control port and a suction port communicate with each other through an intermediate communication path by opening and closing the pressure-sensitive valve. An adapter is provided with an accommodation portion accommodating a differential pressure valve body, and first urging member and a second urging member are interposed in the accommodation portion on both sides of the differential pressure valve in an opening and closing direction with the differential pressure valve body interposed therebetween.