Fluid Feeding System Pressure Stabilization
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Solution Overview
Problem
Fluid discharge systems with discharging devices capable of volumetric changes experience significant pressure fluctuations, leading to unstable discharge pressures and poor fluid discharge, which can result in inadequate molding quality when used in molding machines.
Innovation Solution
A fluid feeding system that includes a feed channel, a pump, a valve, and a control device to manage pressure states, ensuring the valve opens only when the pump-side pressure exceeds a given threshold, and reverses fluid flow direction at the end of the discharge process to stabilize pressures and prevent pressure imbalances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the volume of the introduction chamber is rapidly increased to introduce fluid, then the fluid introduction efficiency is improved, but the internal pressure of the introduction chamber drops rapidly causing unstable discharge pressure
Solution Approach 1:
The pump is activated to increase pump-side pressure before the valve is opened. This preliminary pressurization ensures that when the valve opens and fluid is rapidly introduced into the expansion chamber, the discharge pressure remains stable because the pump is already operating at the required pressure level.
Solution Approach 2:
The control device continuously monitors pump-side pressure and discharge chamber pressure, using this feedback information to determine the optimal timing for valve opening and pump activation. This closed-loop control ensures that pressure conditions are maintained within desired ranges throughout the fluid introduction and discharge cycle.
2Quantity of substance
If the valve is opened early to feed fluid, then the fluid supply is sufficient, but the pump-side pressure is insufficient leading to poor discharge
Solution Approach 1:
The system performs preliminary pressurization by activating the pump before opening the valve. This ensures that when fluid feeding begins, the pump is already operating at sufficient pressure to maintain stable discharge, eliminating the trade-off between fluid quantity and pressure.
Solution Approach 2:
The system operates in periodic cycles: first pressurizing the pump, then opening the valve for fluid introduction, and repeating this sequence. This periodic operation ensures that each fluid introduction cycle begins with adequate pump-side pressure, maintaining both sufficient fluid supply and discharge pressure.
3Stability of the object's composition
If the pump operates continuously to maintain pressure, then the pressure stability is improved, but the pressure fluctuation in the discharging device increases
Solution Approach 1:
Instead of continuous pump operation, the system uses periodic activation: the pump operates to build pressure, then stops while the valve opens for fluid introduction. This periodic operation reduces pressure fluctuations in the discharging device while maintaining overall pressure stability through controlled cycles of pressurization and discharge.
Solution Approach 2:
The system maintains continuous useful action by coordinating pump operation with valve timing. The pump operates during phases when pressure buildup is needed, and the valve opens during phases when fluid introduction is required, ensuring that useful work continues without unnecessary pump operation that would cause pressure fluctuations.
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 configuration minimizes internal pressure fluctuations in the discharging device, stabilizes discharge pressures, and prevents backward fluid flow, ensuring consistent and accurate fluid discharge for improved molding processes.
Implementation Method 1
a pump connected to the feed channel... determining a pressure state on the pump side... when the control device determines that one or both of a pressure P1 on the pump side and a pressure P2 on the discharging device side reaches a pressure state exceeding a given pressure
Implementation Method 2
a valve for blocking a flow of the fluid that flows toward the discharging device via the feed channel... carrying out an opening-and-closing control of the valve based on the determination result
Implementation Method 3
a discharging device provided with an introduction chamber capable of introducing and discharging the fluid by a volumetric change
Implementation Method 4
capable of introducing and discharging the fluid by a volumetric change... feeding fluid to a discharging device that is capable of introducing and discharging the fluid based on a pressure difference
Data Source
AI summary
The fluid feeding system includes a feed channel connected to the discharging device, a pump connected to the feed channel, a valve for blocking a flow of the fluid that flows toward the introduction chamber via the feed channel, and a control device for determining a pressure state on the pump side and carrying out an opening-and-closing control of the valve 70 based on the determination result. The control device carries out the opening-and-closing control in which the valve is made into an open state when the control device determines that a pressure P1 on the pump side reaches a pressure state exceeding a given pressure.