Liquid Pump Elastic Strip Adjusting Mechanism
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Solution Overview
Problem
Existing liquid pumps face issues with insufficient spring force in bellows-shaped and sleeve-type restoring mechanisms, leading to difficulty in rebounding, especially with viscous products and large pumping volumes, and long-term stress causes yielding deformation and failure to rebound.
Innovation Solution
A liquid pump design featuring an elastic mechanism with an adjusting member that allows the elastic strip to switch between a relaxed and preloaded state, reducing the need for excessive pressing force and preventing yielding deformation, using non-metallic materials like elastic plastic or rubber for the elastic mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a bellows-shaped spring is used as a restoring mechanism, then the pressing head can rebound after product dispensing, but the spring force becomes insufficient for viscous products or large pumping volumes
Solution Approach 1:
The patent transforms the static preloaded spring into a dynamic system where the elastic strip can switch between loaded and unloaded states. The pressing head moves along an inclined surface that automatically engages and disengages the elastic strip, allowing the restoring force to be applied dynamically only when needed during the rebound phase, rather than continuously.
Solution Approach 2:
The elastic strip is engaged periodically during the rebound phase through the inclined surface mechanism. As the pressing head moves upward after product dispensing, it naturally engages the elastic strip on the inclined surface, receiving the restoring force. This periodic engagement ensures force is applied when needed without continuous loading.
2Reliability
If the bellows-shaped spring is preloaded to provide sufficient rebound force, then the pressing head can rebound reliably, but the spring undergoes yielding deformation after long-term storage or use
Solution Approach 1:
The patent prepares the elastic strip in advance by positioning it on the inclined surface of the pressing head, but does not apply continuous preload. The strip is ready to engage and provide restoring force when the pressing head needs to rebound, without undergoing prolonged preloading that would cause yielding deformation over time.
Solution Approach 2:
The system transitions from a statically preloaded spring to a dynamically engaged elastic strip. The elastic strip is only loaded when the pressing head moves along the inclined surface during rebound, avoiding continuous stress that leads to yielding deformation and maintaining long-term durability.
3Reliability
If a sleeve-type spring with elastic strip is used, then the pressing head can rebound, but excessive downward-pressing force is required near the upper dead point
Solution Approach 1:
The patent uses an asymmetric inclined surface on the pressing head that is angled to facilitate easy engagement of the elastic strip during upward rebound motion. This asymmetric geometry reduces the downward pressing force required by optimizing the mechanical advantage during the rebound phase, making the pump easier to operate.
4Length of moving object
If the elastic strip is excessively deformed at the lower dead point, then the pressing head reaches full stroke, but the rebound force becomes small and the pressing head rebounds slowly
Solution Approach 1:
The patent optimizes the parameters of the elastic strip including its material properties, cross-sectional dimensions, and mounting geometry on the inclined surface. These parameter changes ensure the strip operates within its elastic range, providing sufficient rebound force while achieving the required stroke length without excessive deformation.
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 design ensures sufficient elastic force during use while preventing long-term stress-induced deformation, ensuring consistent and reliable operation of the liquid pump.
Implementation Method 1
an elastic mechanism being provided between the movable unit and the fixed unit, and the elastic mechanism comprising at least one elastic strip which applies a biasing force to the movable unit to restore the movable unit
Data Source
AI summary
Disclosed is a liquid pump (100, 200, 300, 400, 500, 600, 700, 800, 900), including a movable unit and a fixed unit. The movable unit is capable of moving relative to the fixed unit so as to pump a product out. An elastic mechanism (130, 230, 330, 430, 530, 630, 730, 820, 930) is provided between the movable unit and the fixed unit, and the elastic mechanism (130, 230, 330, 430, 530, 630, 730, 820, 930) comprises at least one elastic strip (131, 231, 331, 431, 531, 631, 731, 821, 931). The elastic strip (131, 231, 331, 431, 531, 631, 731, 821, 931) applies a biasing force to the movable unit to restore the movable unit after the product is pumped. The liquid pump (100, 200, 300, 400, 500, 600, 700, 800, 900) further comprises an elastic mechanism adjusting member movable between a first position in which the elastic strip (131, 231, 331, 431, 531, 631, 731, 821, 931) of the elastic mechanism (130, 230, 330, 430, 530, 630, 730, 820, 930) is in a relaxed state, and a second position in which the elastic strip (131, 231, 331, 431, 531, 631, 731, 821, 931) of the elastic mechanism (130, 230, 330, 430, 530, 630, 730, 820, 930) is in a preloaded state. With the provision of the elastic mechanism adjusting member, it is convenient to press down a pressing head (110, 210, 310, 410, 510, 610, 710, 910) during use, and the yielding deformation of the elastic strip (131, 231, 331, 431, 531, 631, 731, 821, 931) due to long-term stress can also be avoided.