Insert Nut With Elastic Seal for Waterproofing
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Solution Overview
Problem
Conventional insert nuts have insufficient resistance force against screw pull-out and lack airtight and waterproof effects when fixed in plastic units using heating and pressuring methods.
Innovation Solution
An insert nut structure with an elastic seal sleeved on a columnar body and a flange, where the flange abuts the shell's inner surface during thermal welding, providing a strong resistance force against screw pull-out and achieving airtight and waterproof effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an insert nut is fixed into a blind hole of a plastic unit by heating and pressuring, then the insert nut can be assembled to the plastic unit, but the resistance force against screw pull-out is insufficient
Solution Approach 1:
The insert nut is divided into a columnar body and a flange that are integrally formed. The columnar body is inserted into the blind hole while the flange remains outside, creating separate functional zones that improve both fixation strength and assembly ease
Solution Approach 2:
The fixation mechanism transitions from purely internal (within the blind hole) to include an external dimension via the flange. The flange abuts against the inner surface of the shell, creating a distributed load path that significantly increases resistance against screw pull-out
2Reliability
If an insert nut is fixed into a plastic unit by heating and pressuring, then the insert nut can be assembled to the plastic unit, but airtight and waterproof effects are not achieved
Solution Approach 1:
An elastic seal ring is added to the insert nut structure. This flexible sealing element deforms to conform to the blind hole surface, creating reliable airtight and waterproof seals without requiring complex gasket systems or additional sealing components
Solution Approach 2:
The insert nut combines rigid material (for structural strength) with elastic sealing material (for waterproofing). This composite approach integrates multiple functions—mechanical fixation and sealing—into a single assembly, reducing overall device complexity while improving reliability
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 enhances the resistance force against screw pull-out and ensures airtight and waterproof sealing, preventing external water from entering the shell while maintaining a secure assembly.
Implementation Method 1
an elastic seal sleeved on the insert nut... The elastic seal is sleeved on the columnar body and abuts against the flange
Implementation Method 2
A thermal welding method for assembling the insert nut to the shell is accomplished by hot-melting from an interior to an exterior of the shell
Data Source
AI summary
A nut and shell assembly includes a shell and an inset nut structure. The shell has an inner surface that defines an inner shell space and a through hole to communicate the inner shell space with the outside. The insert nut structure includes an insert nut fixed in the through hole, and an elastic seal sleeved on the insert nut and in substantially tight contact with the shell in the through hole. The insert nut includes a columnar body fixed in the through hole, and a flange connected to one end of the columnar body. The flange has an outer diameter greater than that of the columnar body, and abuts against the inner surface of the shell.