Cleaning Fluid Piston Valve for Precise Fast Refilling
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Solution Overview
Problem
Existing cleaning fluid dosing apparatuses for motor vehicle systems face challenges in achieving precise and rapid volume control due to temperature-induced volume changes, internal leaks, and reduced efficiency in quick cleaning sequences, leading to increased fluid consumption and reduced precision.
Innovation Solution
The apparatus incorporates a piston unit with a valve device that ensures rapid refilling of the chamber during reverse movement, featuring a displaceable valve body with a first and second closure body for sealing inflow and outflow channels, and a spring element for unhindered throughflow, along with a compression spring and check valve for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a pressure difference-actuated piston is used to displace cleaning fluid from a chamber, then the cleaning fluid can be delivered in controlled portions, but the reverse movement of the piston takes a relatively long time due to internal leaks
Solution Approach 1:
The invention extracts the harmful internal leak pathway from the system by introducing a valve device that closes the gap between the piston and lateral surface. This eliminates the unwanted fluid flow path while maintaining the necessary sealing for controlled portioning, thereby enabling rapid refilling without the time loss caused by internal leaks.
Solution Approach 2:
The valve device acts as an intermediary component between the piston and the chamber walls. It provides a controlled sealing mechanism that prevents internal leaks during the reverse movement, allowing the chamber to refill quickly and efficiently without the delays caused by uncontrolled fluid leakage through piston gaps.
2Quantity of substance
If internal leaks are present in the piston assembly, then the chamber can refill during reverse movement, but exact volume dosing is prevented and cleaning fluid consumption increases
Solution Approach 1:
The invention removes the source of imprecise dosing by eliminating the internal leak pathway through the valve device. By closing the gap between the piston and lateral surface, it prevents surplus cleaning fluid from flowing through unintended paths, ensuring that only the precisely controlled portion exits through the nozzle and eliminating wasteful consumption.
Solution Approach 2:
The valve device automatically seals the piston-gap pathway based on pressure differential, requiring no external control. During forward movement, the high pressure behind the piston forces the valve closed, preventing leaks. During reverse movement, pressure equalization allows the valve to open for controlled refilling, achieving precise dosing through self-regulating behavior.
3Productivity
If the piston unit is actuated rapidly for quick cleaning sequences, then productivity increases, but temperature-induced volume changes and hardness changes affect action and precision
Solution Approach 1:
The valve device automatically compensates for temperature-induced dimensional changes and hardness variations in the piston components. By relying on pressure differential to control valve opening and closing, the system adapts to thermal expansion or contraction without requiring precise mechanical clearances, maintaining dosing precision even during rapid actuation cycles that generate heat.
Solution Approach 2:
The invention changes the control parameter from mechanical clearance (which is sensitive to temperature) to pressure differential (which remains stable). The valve responds to pressure changes rather than fixed dimensional gaps, allowing the system to maintain precise dosing control despite temperature-induced volume and hardness changes in the piston assembly during rapid cleaning sequences.
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 enhances precision and efficiency by minimizing leaks and temperature dependency, allowing for quick and precise volume control during cleaning sequences while reducing fluid consumption and improving the speed of the cleaning process.
Implementation Method 1
there is provided according to the preferred refinement of the invention a spring element which preloads the valve body counter to the actuation direction and consequently makes possible unhindered throughflow
Implementation Method 2
there is arranged in the housing a compression spring which preloads the piston unit counter to the actuation direction and is compressed by the piston unit during forward movement
Implementation Method 3
the first valve head 11 has a sealing surface which, when the piston body abuts against the valve head, hydraulically seals off the axial aperture, whereby internal leaks are avoided
Data Source
AI summary
An apparatus for volume-controlled portioning of cleaning fluid, having a housing and having a piston unit which is arranged displaceably in the housing and which displaces a cleaning fluid from a chamber into an outflow channel. In order to provide an improved apparatus, which permits exact portioning with reduced temperature dependency and in a cleaning sequence which is as quick as possible. It is proposed that the piston unit includes a piston body and at least one valve device which is arranged on the piston body and which ensures that the chamber is filled with the cleaning fluid during the reverse movement of the piston unit.