Liquid Discharge Nozzle Control to Prevent Bubbles Under Vacuum
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Solution Overview
Problem
In a negative pressure environment, the operation of a reciprocating valve rod in a liquid material discharge device often leads to reduced liquid pressure near the tip, causing bubble generation, which results in disordered drawing lines and scattered discharge of the liquid material due to insufficient closure by the valve rod tip or valve seat wear.
Innovation Solution
A liquid material discharge device with a reciprocating valve rod, actuator, and position detection mechanism, where the acceleration and deceleration times of the valve rod are controlled within specific ranges to prevent bubble generation, and a position detection mechanism ensures reliable closure of the valve seat even with wear, using a compressed-gas supply for stable high-speed discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the valve rod operates reciprocatingly in a negative pressure environment, then high-speed discharge is achieved, but liquid pressure near the tip reduces causing bubble generation
Solution Approach 1:
The invention changes the pressure parameter by introducing a positive pressure environment (via pressurizing device) to counterbalance the negative pressure effect during valve rod reciprocation, preventing bubble generation while maintaining high-speed discharge capability
Solution Approach 2:
The invention applies preliminary pressurization to the liquid material before the valve rod reciprocates, ensuring that the liquid is pre-conditioned with sufficient pressure to prevent bubble formation during the discharge operation
2Reliability
If the valve rod tip closure is insufficient or valve seat wears, then leakage occurs, but maintaining closure force reduces discharge speed
Solution Approach 1:
The invention uses pressurization to compensate for wear and insufficient closure by increasing the liquid pressure, ensuring reliable sealing without requiring excessive mechanical closure force that would slow down the discharge process
Solution Approach 2:
The invention implements a control device that monitors discharge conditions and adjusts the pressurization level dynamically, maintaining optimal closure reliability while preserving high discharge speed through real-time parameter adjustment
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 controlled operation of the valve rod suppresses bubble generation, ensuring stable and high-speed discharge with reliable closure of the valve seat, preventing leakage and maintaining discharge quality even with wear, thus addressing the issues of disordered lines and scattered material.
Implementation Method 1
a compressed-gas supply source pressurizing the storage container
Implementation Method 2
the application space is evacuated into a negative pressure state for degassing of the liquid material
Data Source
AI summary
A liquid material discharge device and method capable of suppressing generation of bubbles caused with a rod raising operation in a negative pressure environment. In a liquid material discharge device used in a negative pressure space and including a storage container; a compressed-gas supply source pressurizing the storage container; a nozzle having a discharge flow path; a reciprocating valve rod; an actuator driving the valve rod; a valve seat having a communication hole that is communicated with the discharge flow path; and a discharge control device controlling the actuator to open and close the communication hole by a tip of the valve rod, the discharge control device controls an acceleration time Au in rising of the valve rod by the actuator to be held within a range of 2 to 300 [ms], thus preventing generation of bubbles caused with the rising of the valve rod.