Duckbill Nozzle Valve Structure for Complete Backflow Sealing
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Solution Overview
Problem
Duckbill valves often fail to maintain a tight seal in the closed position, allowing backflow and contamination of fluids, as the slit opening is not properly closed.
Innovation Solution
Incorporating material thickenings that act transversely to the slit opening direction to compress the sealing lips, ensuring a complete closure by applying a compressive force perpendicular to the slit opening, and utilizing a receiving part with a shape that compresses the base body to enhance sealing, allowing the sealing lips to bear against each other for a tight seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the beak valve is designed with sealing lips to close the slot opening, then the valve can prevent backflow, but the slot opening remains partially open and backflow prevention is insufficient
Solution Approach 1:
The patent introduces material thickenings at specific locations on the base body that extend transversely to the slot opening direction. These localized thickenings apply focused compressive forces on the sealing lips when the base body is pressurized, ensuring complete closure of the slot opening. This local quality enhancement resolves the contradiction by providing precise force application points without requiring overall structural complexity.
Solution Approach 2:
The material thickenings are pre-formed on the base body to create predetermined force transmission paths. When pressure is applied to the base body, these thickenings automatically transmit the compressive force to the sealing lips before the valve operates, ensuring the slot opening is completely closed. This preliminary action eliminates the need for additional actuating mechanisms.
2Adaptability or versatility
If the base body is made elastic to allow opening by pressurization, then the valve can control fluid flow, but the sealing lips are not sufficiently compressed to ensure complete closure
Solution Approach 1:
The material thickenings create localized regions of increased stiffness and force concentration on the elastic base body. When the base body is pressurized and deforms, these thickenings ensure that sufficient compressive force is transmitted to the sealing lips, overcoming the elasticity-induced force distribution problem and ensuring complete slot opening closure.
Solution Approach 2:
The base body combines elastic material properties with localized material thickenings that provide enhanced force transmission. This composite structure allows the base body to remain adaptable for flow control while simultaneously providing the necessary compressive force through the thickened regions, resolving the contradiction between elasticity and sealing force.
3Device complexity
If simple sealing lips are used to form the slot opening, then the valve structure remains simple, but the sealing effectiveness is insufficient to prevent backflow
Solution Approach 1:
Instead of complicating the overall valve structure, the patent introduces material thickenings as localized features on the base body. These thickenings enhance sealing effectiveness by providing focused compressive force transmission to the sealing lips, maintaining structural simplicity while improving reliability.
Solution Approach 2:
The material thickenings act as intermediary elements between the pressurized base body and the sealing lips. They mediate the force transmission, ensuring that the compressive force is effectively transferred to the sealing lips to achieve complete closure, thereby enhancing sealing effectiveness without adding complex mechanisms.
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
Prevents backflow effectively by ensuring the slit opening is completely closed, preventing contamination of fluids in the line, even under pressure, through enhanced force transmission to the sealing lips.
Implementation Method 1
with an at least partially elastic base body (2) having a beak-shaped outlet area (3) in which a slot opening (5) is formed
Implementation Method 2
The material thickening makes it possible for a force acting transversely to the direction of extension of the slot opening to act on the sealing lips
Data Source
Figure 1~3
Figure 4~6
Figure 7~8
AI summary
The invention relates to a nozzle valve (1) for preventing a return flow of a fluid, comprising a base body (2) which has a deformable outflow region (3), into which a slit opening (5) formed by at least two sealing lips (4) is formed, wherein a pressure force is applied to least one of the sealing lips when the nozzle valve is in a closed position transversely to a direction of extension (6) of the slit opening (5).