Precompression Pump Assembly for 15-Bar Sealing Reliability
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Solution Overview
Problem
Existing fluid product dispensing devices with pre-compression pumps and micro-hole nozzles face issues with insufficient pressure delivery, potential user and environmental harm from propellant gases, and compromised sealing integrity at high pressures, leading to leaks and unreliable dose distribution.
Innovation Solution
A modified pre-compression pump design with a reinforced sleeve and improved assembly method for pistons and valves, allowing higher pressure operation without propellant gases, ensuring reliable and reproducible dose distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If traditional pre-compression pumps are used with micro-hole nozzles, then the device structure is simple, but the pressure delivery is insufficient (less than 7 bar) for optimal nozzle operation
Solution Approach 1:
The pump is divided into two separate assembly operations: first assembling the piston in the sleeve, then assembling the valve in the pump body. This segmentation allows each component to be prepared and sealed independently, ensuring that sealing surfaces are not compromised during assembly while enabling the pump to achieve the required high pressure of at least 15 bar for optimal micro-hole nozzle operation.
Solution Approach 2:
The piston is assembled into the sleeve before the valve is assembled into the pump body. This preliminary action ensures that the piston-sleeve sealing interface is established first, allowing subsequent assembly steps to proceed without compromising the integrity of previously created seals, thereby maintaining both high pressure capability and sealing reliability.
2Reliability
If pump components are assembled in traditional sequence, then assembly is straightforward, but sealing integrity is compromised at high pressures leading to leaks
Solution Approach 1:
The assembly process is segmented into two distinct sequences: piston assembly into sleeve, then valve assembly into pump body. This segmentation transforms a potentially complex multi-step assembly with compromised seals into a simpler, more reliable process where each sealing interface is created independently under controlled conditions, ensuring integrity at high pressures without significantly increasing overall assembly complexity.
3Stress or pressure
If propellant gases are used in valves, then high pressure can be achieved, but user and environmental harm occurs
Solution Approach 1:
The chemical propellant gas system is replaced with a purely mechanical pre-compression pump system. The pump uses mechanical compression of the fluid product in a sealed chamber to achieve high pressure delivery of at least 15 bar, eliminating the need for propellant gases entirely. This substitution maintains the required pressure performance while removing harmful effects to users and the environment.
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 pump achieves pressures of at least 15 bars, improving sealing integrity and ensuring consistent dose delivery regardless of user actuation speed, with enhanced assembly reliability and reduced risk of leaks.
Implementation Method 1
a spring is compressed by the pressure created inside the pump chamber
Implementation Method 2
the fluid product is dispensed at a high pressure of at least 15 bar
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
The invention relates to a pump comprising a piston (1) which slides in a body (3) having a chamber (5) defined between an inlet valve (11) and an outlet valve (12), comprising an outlet valve element sliding during actuation in a sealed manner in the chamber (5), which comprises passage means (40) such that, at the end of the actuation, said outlet valve element (39) cooperates in a non-sealing manner with said passage means (40) in order to open said outlet valve (12), said inlet valve (11) comprising an inlet valve element (10) which slides after closure of the inlet valve (11) in a sleeve (9) of the body (3) having a reduced diameter and containing a spring (20) bearing on said inlet valve element (10) and on a bottom of said sleeve (9), said spring (20) returning the piston (1) into its rest position, said sleeve (9) having an inner diameter of less than 4.2 mm, said spring (20) having a force of at least 20 N, so that said pump delivers said fluid product at a pressure (P) of at least 15 bars.