Diesel Exhaust Fluid Injection Device with Push-Button Actuation
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Solution Overview
Problem
Conventional injection devices for diesel exhaust fluid are difficult to operate, especially when the tank position is awkward, requiring significant strength to rotate the switch and may lead to air leakage and incomplete sealing, resulting in fluid leakage.
Innovation Solution
An injection device comprising a cylinder, a hollow pipe-shaped stopper with a stopping portion, and an air tube that allows for easy operation and air discharge, featuring a double anti-leaking mechanism and a deformable elastic sleeve to facilitate fluid flow and prevent leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional injection cylinder with a single rotating switch is used, then the device can inject DEF, but the user must rotate the switch for a while requiring significant strength and it is difficult to completely tighten
Solution Approach 1:
The patent replaces the conventional rotating switch mechanism with a push-button actuation system. The injection is triggered by simply pressing a button that activates a piston, eliminating the need for continuous rotation and reducing the force required from the user to minimal pushing motion.
Solution Approach 2:
The patent introduces a spring-loaded piston mechanism that dynamically converts the brief pushing motion into sustained injection pressure. The spring stores energy during the push and releases it continuously, allowing the injection to complete without requiring the user to maintain force or rotate for an extended period.
2Reliability
If the injection cylinder does not cover the opening of the tank completely, then it is easy to remove, but the injection cylinder may be accidentally removed from the tank resulting in fluid leaking
Solution Approach 1:
The patent divides the connection interface into multiple functional segments: a threaded connection portion for secure attachment, an elastic sealing ring for fluid-tight sealing, and a distinct release mechanism. This segmentation allows the device to achieve both reliable sealing and controlled removal without accidental disconnection.
Solution Approach 2:
The patent introduces an elastic sealing ring as an intermediary element between the injection cylinder and tank opening. This elastic component deforms to fill gaps and create a reliable seal, while the threaded structure provides mechanical interlocking that prevents accidental removal, yet allows intentional removal through the designed release mechanism.
3Adaptability or versatility
If a funnel is placed on the opening neck of the tank to replenish DEF, then the DEF can be poured in, but if the position of the tank makes it difficult to place the funnel, replenishing the DEF becomes difficult
Solution Approach 1:
The patent transitions from the conventional funnel method requiring vertical/top-down access to an injection cylinder that can be attached laterally to the tank opening. This dimensional change in attachment approach allows replenishment from various angles and positions, adapting to different tank orientations and locations.
Solution Approach 2:
The injection cylinder is designed with a universal threaded connection that can interface with various tank opening configurations and positions. The device functions effectively whether the tank is positioned horizontally, vertically, or at awkward angles, making the replenishment process adaptable to any tank location without requiring specific positioning.
Data Source
AI summary
An injection device for diesel exhaust fluid includes a cylinder, a stopper, and an air tube. The cylinder encloses a receiving space. The cylinder has an opening at the bottom end. The stopper is pipe-shaped and has a stopping portion and a top portion at two opposite ends thereof. The stopper is arranged in the receiving space and is movable along the longitudinal direction of the cylinder. the stopping portion selectively plugs the opening of the cylinder so that fluid in the receiving space is unable to flow out via the opening. The air tube is inserted through the stopper and the opening of the cylinder to communicate with exterior. The air tube is positioned to the cylinder near the opening so that the air tube may not move with the stopper.