High-pressure pre-compression pump with dual-spring valve
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Solution Overview
Problem
Existing pumps that use precompression to dispense fluid at high pressure often leave residual drops in the expulsion channel, which can clog spray nozzles and are not effective at pressures above 7 bars.
Innovation Solution
A pump design featuring a piston and actuating stem with an inlet and outlet valve system, utilizing a spring to compress and then release fluid at high pressure (at least 15 bars) while a secondary spring ensures complete expulsion and removal of residual fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a precompression pump is used to dispense fluid at high pressure, then the dispensing pressure is improved, but residual drops remain in the expulsion channel causing nozzle clogging
Solution Approach 1:
The outlet valve remains closed during the compression stroke to preliminarily build pressure without dispensing. The valve only opens after compression is complete, ensuring full pressure buildup before fluid expulsion, which prevents residual drops from remaining in the channel.
Solution Approach 2:
The harmful residual drops are extracted from the expulsion channel by maintaining sealed closure during compression and only opening the outlet valve after complete compression, thereby removing the source of clogging while preserving high pressure dispensing.
2Object-generated harmful factors
If the outlet valve opens during compression, then residual drops are reduced, but dispensing pressure decreases below 15 bars
Solution Approach 1:
The outlet valve is kept closed during the entire compression stroke as a preliminary action to build maximum pressure. Only after compression is complete does the valve open to dispense, ensuring both high pressure (at least 15 bars) and complete expulsion without residual drops.
3Reliability
If a complex valve system is used to eliminate residual drops, then reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The inlet and outlet valve functions are merged into a single valve element that performs both sealing actions. This unified valve system achieves complete dispensing without residual drops while simplifying the overall device structure and reducing manufacturing complexity.
Solution Approach 2:
The single valve element serves multiple functions: sealing the inlet during compression, sealing the outlet during compression, and controlling the timed opening for dispensing. This multi-functionality improves reliability while minimizing device complexity.
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 complete and reproducible dispensing of fluid at high pressure without residual drops, preventing clogging of spray nozzles and maintaining reliability and ease of manufacturing.
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
Implementation Method 2
the force exerted by said second spring being greater than the force exerted by said spring in position at rest
Implementation Method 3
said second spring expands and displaces said outlet valve element axially downwards relative to said piston, generating a vacuum which draws the residual liquid
Data Source
AI summary
Pump for dispensing a fluid product, having a piston having a pump chamber and an inlet and outlet valve. The outlet valve has an outlet valve element that slides inside the pump chamber. The pump chamber has a passage so that, at the end of actuation, the outlet valve element collaborates non-sealingly with the passage to open the outlet valve to expel product. The inlet valve has an inlet valve element sliding in a sleeve containing a spring pressing against the inlet valve element and against an end wall of the sleeve. The outlet valve element is formed by a component inserted with the ability to move into the piston, with the interposition of a second spring, the force exerted by the second spring is greater than the force exerted by the spring in the rest position, and less than the force exerted by the spring in the actuated position.