Double Seal Structure for High-Pressure Water Jet Durability

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Solution Overview

Problem

Conventional seals for high pressure water jets are prone to deformation and damage due to the strong pressure, leading to reduced durability and effectiveness.

Innovation Solution

A double seal system is implemented, comprising an outer seal with a tapered through hole and an inner seal of harder material, where the inner seal is inserted and pressed along the inclined surface of the outer seal to prevent compression deformation, and a protrusion is formed to prevent the inner seal from escaping, with an O-ring on the outer seal for additional sealing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a single seal is used in the high pressure water injection device, then the device structure is simple and easy to manufacture, but the seal is compressed and pushed into the bushing under high pressure water, causing deformation and damage

Engineering Contradiction:

Improveseal structure simplicityVSAvoidseal durability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The seal is divided into two separate components: an outer seal and an inner seal. The outer seal maintains the basic sealing function while the inner seal protects it from high pressure water compression. This segmentation allows each seal to have specialized functions, preventing the deformation issues that occurred with a single seal design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The inner seal is inserted inside the outer seal, creating a nested configuration. The inner seal acts as a protective element within the outer seal, absorbing the impact of high pressure water and preventing the outer seal from being pushed into the bushing. This nested structure maintains reliability while keeping the overall assembly compact.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Reliability

If the seal is made harder to resist compression, then durability improves, but the seal becomes more difficult to manufacture and may lose flexibility needed for effective sealing

Engineering Contradiction:

Improveseal resistance to compressionVSAvoidseal material processing

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Different materials are used for different parts of the sealing system. The inner seal is made of a harder material (such as PTFE or reinforced polymer) to resist compression from high pressure water, while the outer seal can be made of a more flexible material that is easier to manufacture and install. This local differentiation of material properties allows each component to be optimized for its specific function.

Inventive Principle:

Principle #3Local quality

3Reliability

If a double seal system is implemented to prevent deformation, then seal durability and integrity are improved, but the device complexity increases

Engineering Contradiction:

Improveseal integrity under pressureVSAvoidseal system structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The inner seal is inserted inside the outer seal, creating a nested configuration that protects the outer seal from high pressure water compression. This nested structure maintains reliability while keeping the overall assembly compact and relatively simple.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

Instead of making a single seal extremely robust to handle all pressures, the design inverts the approach by using a softer outer seal and placing a harder inner seal inside it. This reversal of the traditional sealing approach allows the inner seal to bear the brunt of high pressure while the outer seal maintains the sealing interface.

Inventive Principle:

Principle #13The other way round (Inversion)

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 double seal configuration effectively prevents compression deformation of the outer seal, ensuring durability and maintaining the seal's integrity under high pressure water conditions.

Implementation Method 1

when the pressure of high pressure water is applied, an inner seal located inside an outer seal is pressed along a tapered portion

Methodology Applied

Scientific EffectPressure gradient: Pressure Gradient

Implementation Method 2

so that compression deformation of the outer seal can be prevented as much as possible

Methodology Applied

Scientific EffectMechanical force: Mechanical Force

Data Source

PatentEP4230302A1Seal for high pressure water jets

Publication Date: 2023.08.23 BC TAECHAN INDAL CORP

AI summary

Proposed is a seal for high pressure water jets, the high pressure water jets each includes a housing, a connector through which high pressure water is introduced, a rotary body exposed in a direction in which the high pressure water inside the housing is discharged, a rotary support for supporting the rotary body, a nozzle connected to an end of the rotary body, a shaft, a bushing, and a seal coupled to the outer circumferential surface of the shaft and having a surface in close contact with the bushing, wherein the seal includes an outer seal provided with a through hole having a tapered portion inclined so that the inner diameter thereof is expanded in the direction in which the high pressure water is discharged, and an inner seal inserted in the tapered portion of the outer seal and having the same inner diameter as that of the through hole.