Dispenser Outlet Valve Segmentation for Leakage Prevention
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Solution Overview
Problem
Generic liquid dispensers tend to leak due to unintentional opening of valve arrangements when the liquid reservoir is squeezed or exposed to low ambient pressure during transport, leading to unintended discharge of liquids.
Innovation Solution
The outlet valve arrangement is designed with a switching valve that opens independently of fluid pressure when the actuating handle is displaced, and an overpressure valve that opens under pressure control, preventing unintentional discharge by ensuring both valves must be open for liquid to flow, with a dual-function actuating handle for volumetric reduction and pressure-independent valve opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pressure control valve arrangements are used in the dispenser, then liquid can be dispensed through the pump, but the dispenser leaks when the liquid reservoir is squeezed or exposed to low ambient pressure during transport
Solution Approach 1:
The outlet valve arrangement is segmented into two separate valves: a switching valve and an overpressure valve. The switching valve is mechanically actuated by the actuating handle to open for dispensing, while the overpressure valve remains closed unless excessive pressure builds up. This segmentation prevents unintended opening of both valves simultaneously, resolving the leakage problem while maintaining dispensing functionality.
2Device complexity
If a single pressure control outlet valve is used, then the structure is simple, but the valve opens unintentionally under overpressure conditions causing leakage
Solution Approach 1:
The outlet valve arrangement is divided into two functionally independent valves with different opening mechanisms. The switching valve responds only to mechanical actuation of the handle, while the overpressure valve responds only to excessive pressure. This segmentation adds a component but provides reliable control by ensuring that normal pressure fluctuations during transport do not trigger unintended discharge.
3Device complexity
If the actuating handle only reduces pump chamber volume, then the pumping mechanism is simple, but the outlet valve cannot be reliably opened independent of pressure conditions
Solution Approach 1:
The actuating handle is given dual functionality: it mechanically actuates the switching valve to open the outlet passage, and simultaneously reduces the pump chamber volume to create the pressure differential needed for liquid flow. This multi-functionality ensures reliable valve opening independent of pressure conditions while maintaining a simple overall mechanism.
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
This design significantly reduces leakage by ensuring the outlet valve can only be opened when the handle is actuated, preventing unwanted discharge even under excessive pressure, and allows for efficient liquid dispensing while maintaining the dispenser's functionality.
Implementation Method 1
with a pump chamber, which, starting from an initial state with maximum pump chamber volume, is manual pump actuation can be volumetrically reduced by means of an actuation handle
Implementation Method 2
an inlet valve arrangement is provided between the liquid reservoir and the pump chamber, which opens under pressure control when there is a negative pressure in the pump chamber compared to the liquid reservoir
Implementation Method 3
the overpressure valve opening under pressure control when there is an overpressure in the pump chamber compared to the outlet channel exists
Data Source
Figure 1a
Figure 1b
Figure 1c
AI summary
2. Fluid dispenser for the discharge of pharmaceutical or cosmetic fluids. 2.1 Fluid dispensers for the discharge of pharmaceutical or cosmetic fluids are known, which comprise a fluid reservoir (12), in which the fluid is stored prior to discharge, an outlet channel (42) through which the fluid can be dispensed to an environment, a pump chamber (60) which, starting from an initial state with maximum pump chamber volume, can be volumetrically reduced by a manual pump activation by means of an activation handle (40), wherein an inlet valve arrangement (70) is provided between the fluid reservoir (12) and the pump chamber (60), which valve arrangement opens in a pressure regulated manner when a negative pressure exists in the pump chamber (60) with respect to the fluid reservoir (12), and wherein an outlet valve arrangement (80) is provided between the pump chamber (60) and the discharge opening (42). 2.2 An outlet valve arrangement (80) is proposed which comprises a switching valve (84; 86; 88) that is mechanically compelled to open in reaction to a displacement of the activation handle (40) and independent of the fluid pressure in the pump chamber (60). 2.3 The use in particular for fluid dispensers with fluid reservoirs that are variable in volume.