Trigger Pump Precompression Valve for Consistent Spray Pressure
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Solution Overview
Problem
Existing trigger pump dispensers often dispense liquid at inappropriate pressures, leading to inefficiencies and inconsistent spraying patterns, and lack a mechanism to ensure liquid is only expelled at a predetermined elevated pressure.
Innovation Solution
A precompression valve system that includes an inlet valve to close during suction and open during pressure increase, and an outlet valve that opens only when a predetermined elevated pressure is reached, ensuring liquid is dispensed only when the pressure is sufficient, using a design with a pair of curved spring arms and a conical connection to define the pressure threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a precompression valve is added to ensure liquid is dispensed only at predetermined elevated pressure, then the spraying pattern is improved and discharge at low pressure is prevented, but the device complexity increases
Solution Approach 1:
The valve mechanism is divided into two separate parts: an outer valve part and an inner valve part. The outer valve part includes the valve body and outlet, while the inner valve part includes the precompression element and sealing components. This segmentation allows each part to be optimized for its specific function and simplifies manufacturing and assembly.
Solution Approach 2:
The inner valve part is nested within the outer valve part, with the precompression element positioned inside the valve body. This nested configuration allows the precompression function to be integrated into the existing valve structure without requiring a completely separate mechanism, thereby reducing overall complexity while maintaining the pressure control function.
2Reliability
If a precompression valve mechanism is implemented, then liquid discharge at low pressure is prevented, but the manufacturing complexity increases
Solution Approach 1:
By dividing the valve into outer and inner parts that can be manufactured separately using standard machining processes, the invention enables each component to be produced independently with conventional manufacturing methods, reducing overall manufacturing complexity.
Solution Approach 2:
The precompression valve mechanism is designed to be compatible with standard trigger pump dispenser architectures. The outer valve part can be integrated into existing valve bodies, and the inner precompression element can be adapted to work with various sealing materials and configurations, making the solution universally applicable across different dispenser designs.
3Manufacturing precision
If the outlet valve opens only after predetermined elevated pressure is established, then consistent high pressure spraying is achieved, but the device complexity increases
Solution Approach 1:
The precompression element is designed to automatically respond to pressure changes in the pump chamber. When pressure reaches the predetermined threshold, the element self-actuates to open the outlet valve without requiring external pressure sensing mechanisms or control systems. This self-service approach maintains manufacturing precision while avoiding additional complexity.
Solution Approach 2:
The pressure threshold is controlled by changing physical parameters of the precompression element, such as its stiffness, preload force, or geometric dimensions. By adjusting these parameters during manufacturing, the desired pressure threshold is achieved without requiring complex active control systems or electronic pressure sensors.
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 system ensures consistent and efficient dispensing by preventing fluid discharge at low pressures and improving the spraying pattern, while allowing conversion of existing non-pre-compression pumps to pre-compression functionality.
Implementation Method 1
biasing means for biasing the trigger towards its retracted position
Implementation Method 2
precompression valve operable to allow liquid through the outlet only after a predetermined elevated pressure is established in the pump chamber
Implementation Method 3
inlet valve adapted to close the inlet port when liquid to be dispensed is in the pump chamber and the piston is moved from the retracted position to the inserted position
Data Source
AI summary
A trigger pump dispenser (10) comprising: a body (20); an outlet nozzle (35); a pump chamber (190); a piston (25) for defining a variable volume in the pump chamber (190) and movable between a retracted position of larger chamber volume and an inserted position of lesser chamber volume; a trigger (60) coupled with the piston (25) and movable from a starting position at which the piston (25) is in the retracted position and a depressed position at which the piston (25) is in the inserted position; biasing means (65a, 65b) is provided for biasing the trigger (60) towards its retracted position.