Rinse Valve Armature Extraction for Vacuum Waste Systems
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Solution Overview
Problem
Conventional rinse valves for vacuum waste receptacles face reliability issues due to mineral deposits from wetting and drainage, leading to armature seizure and contamination, and are vulnerable to freezing damage from prolonged exposure to cold temperatures.
Innovation Solution
A solenoid-operated valve design with the armature out of the primary flow path, utilizing differential fluid pressure to reduce mineral buildup and incorporating a self-venting, self-draining, and freeze-protection mechanism with a sleeve valve to accommodate expanding ice.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the solenoid armature is disposed directly in the main flow path of the rinse fluid, then the valve can effectively control the flow, but mineral deposits build up on the armature and housing surfaces causing increased friction, higher current draw, and eventual seizure
Solution Approach 1:
The patent removes the solenoid armature from the main rinse fluid flow path and places it in a separate control chamber. This extraction eliminates direct contact between the armature and rinse fluid, preventing mineral deposit build-up on the armature surfaces while maintaining effective flow control through indirect actuation of a valve element.
2Speed
If the armature operates in wet conditions with frequent draining, then the valve responds quickly to commands, but mineral deposits accumulate on surfaces leading to galling and flaking of surface plating
Solution Approach 1:
The armature is extracted from the wet environment of the main flow path and placed in a separate control chamber that experiences minimal wetting. This separation maintains quick response capability through efficient magnetic actuation while eliminating the wet-dry cycling that causes mineral deposits, galling, and plating flaking.
3Ease of operation
If rinse fluid remains in the valve during prolonged cold exposure, then the valve maintains readiness for operation, but the rinse fluid freezes and expands causing damage to the valve structure
Solution Approach 1:
The valve is segmented into separate chambers: the main flow path and the control chamber housing the armature. The control chamber is designed to drain more completely and includes features that prevent freeze-up. This segmentation allows the critical control mechanism to be protected from freezing while maintaining operational readiness through proper drainage design.
4Device complexity
If the armature is positioned in the flow path for direct control, then the valve structure is simplified, but friction from mineral build-up increases bearing and shearing stresses on armature and housing surfaces
Solution Approach 1:
The armature is extracted from the high-stress environment of the main flow path. This separation dramatically reduces friction and mineral deposit build-up on the armature and housing surfaces, thereby reducing bearing and shearing stresses. The valve structure complexity increases slightly due to the separate control chamber, but this is offset by the significant reduction in maintenance needs and extended service life.
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 the reliability and longevity of the valve by minimizing wear and contamination, while protecting against freezing damage, ensuring consistent operation and reduced maintenance.
Implementation Method 1
solenoid actuated armature arrangements to control the flow of rinse fluid
Implementation Method 2
the contents of the waste receptacle are removed by differential pressure to the waste tank
Data Source
AI summary
The apparatus and method of the invention provides for a rinse valve for controlling the flow of rinse fluid to a vacuum waste receptacle. The rinse valve comprises a primary rinse fluid flow path and a poppet assembly intersecting the primary rinse fluid flow path. The rinse valve also comprises a solenoid-driven fluid control device having a solenoid armature movable between an inactive state in which the armature engages the poppet assembly to block flow of the rinse fluid through a poppet channel and an active state in which the solenoid armature is disengaged from the poppet assembly to allow flow of the rinse fluid through the poppet channel to raise the poppet assembly, permitting the flow of the rinse fluid through the primary rinse fluid flow path and out of the valve, the armature being located at all times out of the primary flow path of the rinse fluid.