Suction Coupling Constriction Body for Residual Waste Removal
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Solution Overview
Problem
Conventional suction devices for removing faeces from collection containers in vehicles often result in residual faeces escaping during uncoupling, leading to soiling, health, and water protection concerns, with existing solutions either ineffective or costly and complex to implement.
Innovation Solution
A suction device with a constriction body that narrows the flow channel to accelerate air flow and turbulence, ensuring residual faeces are removed, eliminating the need for additional check valves and simplifying the design, while allowing for adjustable flow rates and easy handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ball valve is arranged at a certain distance from the coupling surface to close the hose after suction, then the hose can be sealed, but mixed fluid collects in the dead space between the coupling surface and ball valve and escapes after uncoupling
Solution Approach 1:
The suction device performs preliminary cleaning action by accelerating air flow through the flow channel before uncoupling occurs. The constriction body creates turbulence that removes mixed fluid residues from the flow channel and connection piece, preventing escape after uncoupling while maintaining reliable hose sealing during operation
2Object-generated harmful factors
If a membrane is arranged in the socket to prevent faeces from flowing out, then faeces escape is prevented, but the residue of faeces can freeze in the socket preventing re-coupling and retrofitting is expensive and complex
Solution Approach 1:
The suction device serves itself by using its own air flow system to clean its own flow channel and connection piece of mixed fluid residues. The constriction body creates self-cleaning turbulence that removes contaminants without requiring external membranes or additional components, eliminating freeze prevention issues and retrofitting complexity
Solution Approach 2:
The device performs preliminary cleaning of the flow channel before uncoupling occurs. The accelerated air flow through the constriction body removes mixed fluid residues proactively, preventing both escape and freezing issues that would require membrane solutions
3Object-generated harmful factors
If an additional shut-off valve is arranged for each collection tank, then faeces escape can be prevented, but weight, complexity and costs increase
Solution Approach 1:
The suction device uses its own air flow system to clean and prevent mixed fluid escape without requiring external shut-off valves. The constriction body creates self-cleaning turbulence that removes residues, eliminating the need for additional valves and reducing weight, complexity and costs
Solution Approach 2:
The invention changes the flow parameters by introducing a constriction body that accelerates air flow and creates turbulence. This parameter change enables the air flow to perform cleaning and prevention functions that would otherwise require additional mechanical components like shut-off valves
4Object-generated harmful factors
If the flow channel cross section is reduced to accelerate air flow and create turbulence, then mixed fluid residues are removed, but the suction device requires a constriction body mechanism
Solution Approach 1:
The invention changes the flow parameters by introducing a constriction body that accelerates air flow and creates turbulence. This parameter change enables effective removal of mixed fluid residues through enhanced fluid dynamics rather than requiring complex mechanical cleaning mechanisms
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 device effectively removes residual faeces from the suction device and connection pieces, preventing escape and reducing maintenance complexity and costs, ensuring a drip-free uncoupling process.
Implementation Method 1
an increased flow speed of the air is achieved in the narrowed section
Implementation Method 2
turbulences arise, which ensure that solid or highly viscous components of the mixed fluid are also entrained and sucked off
Implementation Method 3
the faeces in the tank can be suctioned off by means of negative pressure
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3b
AI summary
The invention relates to a suction device (1) for evacuating a mixed fluid, in particular sewage, from a collection vessel (2), in particular a sewage tank in a railway vehicle, comprising a mixed fluid inlet (4) for accepting the mixed fluid, said inlet (4) being fluidically connectable to a port of the collection vessel (2), further comprising a mixed fluid outlet (8) for discharging the mixed fluid, said outlet (8) being fluidically connectable to a suction pipe, and also comprising a duct (14) which extends between the inlet and the outlet. The invention especially relates to a constriction member (10) which is designed to reduce a cross-section of the duct (14) in some sections or along the entire length of the duct. The invention further relates to a suction station for evacuating a mixed fluid and to such a method.