Liquid Discharge Pressure Venting for Fixed-Amount Stability
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Solution Overview
Problem
Pressure fluctuation in compressed gas systems used in discharge devices leads to variations in discharge amounts, particularly when the discharge operations are short or performed at short intervals, causing inconsistencies in the intended and actual discharge quantities.
Innovation Solution
A discharge device with a pressure control valve, a discharge valve, and a leak mechanism that vents part of the compressed gas to the outside, reducing pressure fluctuations by maintaining a consistent secondary side pressure through an orifice or flow control mechanism, controlled by a device that adjusts the operation based on pre-stored conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a pressure control valve is used to maintain constant pressure for fixed amount discharge, then discharge precision is improved, but pressure fluctuation occurs during short or rapid discharge operations
Solution Approach 1:
The system is divided into two independent pressure control loops: a primary pressure control valve (3) that maintains baseline pressure, and a secondary pressure control valve (20) that compensates for rapid pressure changes during short discharge operations. This segmentation allows each valve to operate independently, with the secondary valve specifically addressing the instability issue without affecting the primary pressure control function.
Solution Approach 2:
A buffer tank (17) is introduced as an intermediary component between the primary pressure control valve and the discharge valve. The buffer tank absorbs pressure fluctuations and provides pressure stabilization during rapid discharge operations, acting as a mediator that smooths out pressure variations before they reach the discharge point.
2Productivity
If the discharge valve operates rapidly for short discharge operations, then productivity is improved, but pressure fluctuation increases causing discharge amount variation
Solution Approach 1:
Pressure sensors (5a, 5b) are positioned to detect pressure changes in real-time, and the control unit (10) receives this feedback to independently control the opening/closing timing of the secondary pressure control valve (20). This feedback mechanism allows the system to respond to pressure fluctuations during rapid discharge operations and adjust the secondary valve accordingly, maintaining discharge consistency even at high speeds.
Solution Approach 2:
The system transitions from static pressure control to dynamic pressure control by introducing a secondary pressure control valve that can rapidly adjust its opening degree in response to real-time pressure changes. This dynamic adjustment capability allows the system to maintain pressure stability during rapid discharge operations, enabling high-speed operation without sacrificing discharge precision.
3Productivity
If continuous discharge operations are performed, then productivity is improved, but pressure oscillations accumulate causing discharge variation
Solution Approach 1:
The control unit continuously monitors pressure changes and maintains the secondary pressure control valve in a partially open state during continuous discharge operations, ensuring continuous pressure compensation. This continuous action prevents pressure oscillations from accumulating, allowing sustained high-speed operation with consistent discharge amounts throughout extended operation periods.
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 solution stabilizes the discharge process, minimizing variations in discharge amounts and ensuring consistent delivery even during continuous operations by maintaining the secondary side pressure below the setting value, thus reducing the impact of pressure oscillations.
Implementation Method 1
a leak mechanism 11 that vents, to the outside, part of the compressed gas of which the pressure has been adjusted by the pressure control valve 3
Implementation Method 2
a pressure control valve 3 that adjusts a pressure of compressed gas supplied from an external compressed gas source 2 to a desired level
Data Source
AI summary
A discharge device capable of suppressing pressure fluctuation of a compressed gas supplied to a container in which a liquid material is stored. The device includes a storage container in which a liquid material is stored; a discharge port through which the liquid material is discharged; a pressure control valve that adjusts a pressure of a compressed gas supplied from an external compressed gas source to a desired level; a discharge valve that establishes or cuts off communication between the pressure control valve and the storage container; a control device that controls operation of the discharge valve; a first flow line connecting the pressure control valve and the discharge valve; and a second flow line connecting the discharge valve and the storage container. The device further includes a third flow line branched from the first flow line, and a leak mechanism connected to the third flow line.