Viscous Liquid Discharge Screw With Liquid-Arresting Space
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Solution Overview
Problem
Existing screw type discharging apparatuses for viscous liquid materials face issues with high pressure requirements, accelerated wear of sealing members due to friction, and increased sliding resistance, which complicates the discharge of highly viscous liquids and requires larger motors, while also necessitating multiple sealing members to prevent leakage.
Innovation Solution
The introduction of a liquid-arresting space above the screw insertion bore, which minimizes the pressure in the screw insertion bore and reduces the contact between the liquid and the sealing member, allowing for lower pressure application and reduced wear, along with a design that avoids the liquid reaching the sealing member by adjusting the flow resistances and using a smaller motor for highly viscous materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high pressure is applied to feed highly-viscous liquid material or liquid material containing filler from the reservoir, then the liquid material can be fed through the apparatus, but wear is accelerated due to friction between the sealing member and screw shaft
Solution Approach 1:
The patent extracts the liquid material from the high-pressure zone by introducing it at a position away from the screw shaft (at a radial distance of 0.05 to 0.15 times the screw shaft diameter). This allows the liquid to be fed through the apparatus without requiring high pressure at the sealing interface, thereby reducing wear on the sealing member while maintaining effective liquid material delivery.
Solution Approach 2:
The patent introduces an intermediary flow path that allows liquid material to be supplied independently of the screw pumping action. By providing a separate introduction port and flow passage that bypasses the high-friction sealing interface, the system mediates between the need for liquid material delivery and the need to protect the sealing member from wear.
2Quantity of substance
If the size of the reservoir increases (particularly the diameter), then more liquid material can be stored, but the length of the flow passage is prolonged and even higher pressure has to be applied
Solution Approach 1:
The patent extracts the liquid material from the reservoir at an early stage, before it needs to travel through a long flow passage. By introducing the liquid material directly near the screw shaft at a radial distance of 0.05 to 0.15 times the diameter, the system eliminates the need for prolonged pressurized flow through extended passages, thereby reducing the pressure requirements while maintaining large reservoir capacity.
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 minimizes wear on sealing members, reduces the required rotational force for discharging viscous liquids, and allows for the use of smaller motors, while effectively preventing liquid intrusion and leakage, thus enhancing the efficiency and reliability of the discharging process.
Implementation Method 1
a screw having a helical blade which is axially provided over a surface of a rod-like member... rotating the screw... the blade feeds a liquid material to an discharging port with rotation of the screw
Implementation Method 2
a liquid material supply flow passage communicating with the liquid material supply port... a high pressure has to be applied in order to feed a highly-viscous liquid material
Data Source
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AI summary
Object: To provide a viscous liquid material discharging method and apparatus which can minimize generation of the problem of wear of a sealing member due to friction, and which can minimize a rotational force required at the time of starting discharge of a highly-viscous liquid material. Solving Means: In the viscous liquid material discharging method and the liquid material discharging apparatus for carrying out the method, the apparatus comprises a screw having a helical blade which is axially provided over a surface of a rod-like member, a rotation driving mechanism for rotating the screw, a main body having a screw insertion bore in which the screw is inserted, a liquid material supply port formed in a lateral side of the screw insertion bore, and a liquid material supply flow passage communicating with the liquid material supply port, a sealing member which is disposed in the screw insertion bore and through which the screw penetrates, and a nozzle mounted to the main body and communicating with the screw insertion bore. A liquid-arresting space is formed above the liquid material supply port in the screw insertion bore. The liquid material is supplied while avoiding the sealing member from being wetted with the liquid material, and the screw is rotated in a forward direction to discharge the liquid material from the nozzle.