Fluid Pump Inlet Valve Actuator Plunger Decoupling
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Solution Overview
Problem
Existing inlet valves for fluid pumps, such as gasoline or diesel pumps, suffer from leakage due to transverse movements of the actuator causing the tappet to seat crookedly in the valve seat, leading to increased wear and leakage rates.
Innovation Solution
The actuator and plunger are designed to be separate entities, with a coupling element that decouples transverse forces from the plunger, allowing only axial forces to be transmitted, ensuring straight ram guidance and reducing wear, and incorporating a magnetic armature for precise actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the actuator and plunger are rigidly connected, then the actuator can effectively move the plunger, but transverse movements of the actuator cause the plunger to seat crookedly in the valve seat, leading to leakage and wear
Solution Approach 1:
The actuator and plunger are separated into independent components rather than being rigidly connected. The actuator can move freely in any direction while the plunger is constrained to move only axially through the cylindrical bore, eliminating the transmission of harmful transverse movements while maintaining effective actuation through axial force transmission.
Solution Approach 2:
A coupling element (such as a magnet or mechanical coupling) is introduced between the actuator and plunger to transmit axial forces while decoupling transverse movements. This intermediary allows the actuator to move freely while ensuring the plunger receives only the necessary axial actuation force without experiencing harmful transverse loads.
2Productivity
If the actuator moves with transverse components, then the actuator can be actuated effectively, but the plunger experiences transverse movements that prevent complete closure of the inlet opening
Solution Approach 1:
The system is divided into an actuator subsystem that can move freely and a plunger subsystem that is constrained to precise axial movement. The cylindrical bore and guide structures ensure the plunger maintains precise alignment and seating position regardless of actuator movement variations, achieving both efficient actuation and precise sealing.
Solution Approach 2:
The cylindrical bore and guide structures automatically constrain the plunger to axial movement only, self-correcting any misalignment or transverse movement attempts. This passive guidance mechanism ensures precise seating without requiring complex active control systems.
3Reliability
If the actuator and plunger are separated, then transverse movements are eliminated, but additional components such as coupling elements are required
Solution Approach 1:
The cylindrical bore serves multiple functions: it guides the plunger axially, constrains transverse movements, provides structural support, and houses the coupling element. This multi-functional design achieves reliable plunger guidance without adding excessive complexity, as a single structural feature performs multiple critical roles.
Solution Approach 2:
A simple coupling element (such as a magnet or small mechanical coupling) is used to connect the actuator and plunger axially. This minimal intermediary component transmits force effectively while allowing the actuator and plunger to remain physically separated, maintaining reliability without significant complexity increase.
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 or eliminates leakage and wear by preventing transverse movements of the plunger, ensuring reliable closure of the fluid inlet opening and improving the overall efficiency and longevity of the valve.
Implementation Method 1
incorporating a magnetic armature for precise actuation
Data Source
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AI summary
The invention relates to an inlet valve (101) for a fluid pump, comprising a movably supported tappet (103) for closing a fluid inlet opening and an actuator (105) for moving the tappet (103), wherein the actuator (105) and the tappet (103) are formed separately from each other and can be coupled to one another by means of a coupling element (107) for transmitting an actuator driving force to the tappet (103). The invention further relates to an assembly method for an inlet valve (101).