Spray Head Assembly Suction Seal for Leakage Prevention
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Solution Overview
Problem
Conventional spray head assemblies are prone to leakage during transportation and are not waterproof, leading to contamination and wastage of liquid due to unintentional discharge and failure to recapture remaining liquid in the nozzle.
Innovation Solution
A spray head assembly featuring a tubular cylinder with a check valve, piston rod, spring, and movable members that create a suction force to seal the cylinder and recapture liquid in the nozzle upon return, preventing leakage and ensuring water-tight operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the press head is set to be in a pushed status to prevent unintentional liquid discharge, then liquid leakage is prevented, but the device complexity increases due to the need for additional sealing mechanisms
Solution Approach 1:
The sealing function is divided into two independent components: a seal ring on the piston rod for sealing the liquid supply passage, and a check valve for sealing the nozzle outlet. This segmentation allows each sealing component to be optimized independently and simplifies the overall sealing system.
Solution Approach 2:
The check valve automatically seals the nozzle outlet when the press head is in the pushed status without requiring additional control mechanisms. The valve uses the pressure differential created during normal operation to close and seal the outlet, providing self-service sealing functionality.
2Object-affected harmful factors
If the spray head assembly is made waterproof to prevent contamination, then product integrity is maintained, but the device complexity increases due to additional sealing components
Solution Approach 1:
The seal ring on the piston rod serves dual purposes: it seals the liquid supply passage to prevent leakage during operation, and simultaneously provides waterproofing by sealing the interface between the moving piston rod and the stationary cylinder body. This merging of sealing functions reduces the need for separate waterproofing components.
3Productivity
If the press head is pushed down to spray liquid, then liquid discharge function is achieved, but liquid remains in the nozzle causing wastage
Solution Approach 1:
The check valve maintains continuous sealing of the nozzle outlet from the moment the press head is pushed down until it returns to the initial position. This continuous sealing action ensures that the liquid discharge process is complete and prevents liquid from remaining in the nozzle, eliminating wastage.
4Reliability
If a check valve is added to seal the cylinder and prevent leakage, then reliability is improved, but the device complexity increases
Solution Approach 1:
The check valve is designed to automatically open and close based on the pressure differential created during the push and return strokes of the press head. It seals the cylinder outlet during the push stroke and automatically opens to allow liquid to be sucked back during the return stroke, providing self-service operation without requiring external control 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
The solution effectively seals the cylinder to prevent leakage and recaptures remaining liquid in the nozzle, enhancing the operational efficiency and hygiene of the spray head assembly by ensuring that the liquid is not wasted and maintaining the product's integrity during use and storage.
Implementation Method 1
A spring is mounted to the piston rod to provide a force to the piston rod
Implementation Method 2
The check valve has a cap and a check rod, wherein the cap is movably connected to the inlet path which is opened and closed when the cap is moved up and down
Implementation Method 3
The piston head is movably in contact with the inside of the cylinder
Implementation Method 4
the interior of the spray head generates a suction force when the press head returns to its initial position so as to suck the liquid remained in the nozzle back
Data Source
AI summary
A spray head assembly includes a tubular cylinder having a separation board transversely connected therein and a through hole is defined centrally through the separation board. A space is defined in the cylinder and communicates with the through hole. A check valve is located in the space and has a check rod which extends through the through hole. A piston rod is located in the cylinder and a spring is mounted to the piston rod. A cover is connected to the cylinder and a locking member. The piston rod extends through the locking member. A push tube extends through the locking member and communicates with the cylinder. A movable member is located in the push tube which is connected to a press head. A nozzle extends outward from the press head. The spray head is water-proof and the amount liquid remained in the nozzle can be sucked back after use.