Trigger Liquid Sprayer Posture Adaptor for Dripping Prevention
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Solution Overview
Problem
The trigger type liquid ejector experiences variations in ejection amount between upright and inverted postures due to air bubbles blocking the recovery passage and the ball valve separating from the valve seat, leading to dripping and inefficient liquid supply.
Innovation Solution
The integration of an upright and inverted posture adaptor with a communication passage that allows air bubbles to be discharged into the container body, and an accumulator valve to secure ejection pressure, along with specific dimensions for the cross-sectional areas and positions of the valve and passage components to optimize liquid flow and seating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a recovery passage is provided to bring the inside of the cylinder in communication with the inside of the container body, then air bubbles can be discharged from the cylinder, but liquid may drip outside through the external air introduction hole when air bubbles block the recovery passage
Solution Approach 1:
The patent introduces an intermediary component - the communication passage formed between the upright and inverted posture adaptor and the vertical supply pipe - that provides an alternative pathway for air bubble discharge. This intermediary passage bypasses the blocked recovery passage, allowing air bubbles to be discharged through the communication passage into the container body without causing liquid to escape through the external air introduction hole.
2Productivity
If the ball valve is allowed to separate from the valve seat for liquid suction, then liquid can be efficiently supplied to the cylinder, but ejection pressure is not secured when the ball valve remains separated
Solution Approach 1:
The patent employs dynamic control of the ball valve position through pressure changes. During the suction phase, negative pressure allows the ball valve to separate from the valve seat for efficient liquid supply. During the ejection phase, positive pressure pushes the ball valve against the valve seat to secure ejection pressure. This dynamic adjustment of the valve state based on operational phase resolves the contradiction between supply efficiency and ejection pressure.
3Device complexity
If the trigger type liquid ejector is designed to work in upright posture only, then the structure can be simplified, but the ejector cannot be used in inverted posture which limits versatility
Solution Approach 1:
The patent incorporates an upright and inverted posture adaptor that enables the ejector to function in both upright and inverted postures. The adaptor includes switching valves and communication passages that automatically adjust the flow paths based on the ejector's orientation. This multi-functional design allows the same device to be used in different postures without requiring separate designs, resolving the contradiction between structural simplicity and versatility.
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 configuration enables consistent liquid ejection in both postures by efficiently discharging air bubbles and stabilizing the ejection pressure, reducing dripping and variation in ejection amount.
Implementation Method 1
the ball valve separates from the valve seat due to its own weight. In this state, when the piston is moved rearward for ejection, the liquid in the cylinder or the connection passage may flow toward the container body via a gap between the ball valve and the valve seat
Implementation Method 2
as the trigger is pulled rearward, the piston is moved rearward while being guided by a piston guide formed in the cylinder. Thereby, the inside of the cylinder is pressurized, and liquid in the cylinder passes through the vertical supply pipe and the ejection barrel and is ejected from the ejection hole
Implementation Method 3
as the piston is moved forward according to forward movement (return) of the trigger, the inside of the cylinder is depressurized. When the inside of the cylinder is depressurized, as the liquid in the container body is suctioned into the inner tube
Data Source
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AI summary
A trigger type liquid ejector (3) includes an ejector body (10) and a nozzle (11), the ejector body includes a vertical supply pipe (14), an ejection barrel (15), a trigger (63), a piston (72), and a cylinder (71), a recovery passage (S2) configured to bring an inside of the cylinder in communication with an inside of the vertical supply pipe via a space between a piston body (91) of the piston and a piston guide (78) of the cylinder is formed in the ejector body, the vertical supply pipe has a lower inner tube part (32) into which the recovery passage opens, the trigger type liquid ejector further includes an upright and inverted posture adaptor (12) attached into the lower inner tube part in a state where communication between the recovery passage and an inside of a container body (2) is blocked, and a communication passage (S4) configured to bring the recovery passage in communication with the inside of the container body is formed between an outer circumferential surface of the upright and inverted posture adaptor and an inner circumferential surface of the lower inner tube part.