Precompression Pump Assembly Method for High-Pressure Sealing

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Solution Overview

Problem

Existing fluid product dispensing devices with precompression pumps often deliver insufficient pressure, are prone to leakage, and have complex assembly processes that can damage sealing components, limiting their reliability and ability to deliver consistent doses at high pressures.

Innovation Solution

A precompression pump assembly method involving a piston, outlet valve, inlet valve, and spring, where the piston and outlet valve are inserted from the bottom and the spring and inlet valve are inserted from the top, with a sleeve secured to the pump body to form a double wall and reduce deformation, ensuring sealed welds and orientation of sealing lips to prevent damage during assembly, allowing for higher pressure delivery.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional assembly methods are used, then assembly is simpler, but sealing components are damaged and reliability decreases

Engineering Contradiction:

Improvesealing capacityVSAvoidassembly process

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The sealing lips are pre-oriented in the correct direction before assembly begins. The piston and outlet valve are inserted from the bottom while the inlet valve is inserted from the top, ensuring sealing lips are properly positioned before any damaging forces are applied during assembly.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Instead of inserting all components from the traditional top-down direction, the invention inserts the piston and outlet valve from the bottom (opposite direction) while inserting the inlet valve from the top. This inversion of assembly direction prevents damage to sealing lips and improves sealing capacity.

Inventive Principle:

Principle #13The other way round (Inversion)

2Stress or pressure

If conventional pump design is used, then manufacturing is simpler, but pressure delivery is insufficient

Engineering Contradiction:

Improvepressure deliveryVSAvoidassembly complexity

Core Design Contradiction:

Stress or pressureVSEase of manufacture

Solution Approach 1:

The pump is divided into distinct components (piston, outlet valve, inlet valve, spring, sleeve) that are assembled in a specific sequence. This segmentation allows each component to be optimized for high-pressure performance while maintaining manufacturability through standardized assembly procedures.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention changes the assembly parameters (insertion direction, sequence of assembly) to enable the pump to achieve higher pressure delivery (at least 15 bars). These parameter changes in the assembly process result in a pump structure that can withstand and deliver higher pressures compared to conventional designs.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If sealing lips are not protected during assembly, then assembly is faster, but leakage occurs during use

Engineering Contradiction:

Improvesealing integrityVSAvoidassembly time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The assembly method converts what would normally be damaging forces (insertion from wrong direction) into beneficial alignment. By inserting components from opposite directions, the sealing lips are naturally guided into their correct orientation, turning a potential harm into a benefit for sealing integrity.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 method enables the delivery of fluid products at pressures of at least 15 bars, improving sealing capacities and ensuring reliable, reproducible dispensing, while simplifying the assembly process and enhancing the integrity of parts under high pressure.

Implementation Method 1

a spring is compressed under the effect of pressure created inside the pump chamber, said spring being released at the end of actuation after opening of an outlet valve, such that the dose of product contained in the pump chamber is expelled by said spring

Methodology Applied

Scientific EffectElastic energy storage and release: Elasticity

Implementation Method 2

said sleeve being welded to said pump body by a sealed weld, in particular an ultrasound weld

Methodology Applied

Scientific EffectUltrasonic welding: Ultrasonic Vibration

Data Source

PatentUS12049884B2Method for assembling a high-pressure precompression pump

Publication Date: 2024.07.30 APTAR FRANCE SAS

AI summary

A method for assembling a fluid product dispensing pump, including providing a piston (1) secured to an actuation rod (2); a pump body (3) having a pump chamber (5); a sleeve (50), an outlet valve element (39) an inlet valve element (10) which slides in a sleeve (9) of the pump body having a reduced diameter; and a spring (20). The method includes fixing the outlet valve element in the piston; inserting the piston and the outlet valve element into the sleeve; inserting from the top the spring and the inlet valve element into said sleeve; and inserting from the top the sleeve into the pump body.