Cellular Rotary Feeder Pressure Equalization
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Solution Overview
Problem
Rotary valves used for conveying powdery or viscous materials face high mechanical stress due to weight and flow characteristics of the bulk material, leading to increased wear and reduced service life, especially when high conveying speeds are required.
Innovation Solution
Implementing a rotary valve design with cavities subjected to overpressure to counteract internal forces and moments, using a pressure device to generate cavity and sealant overpressure, which equalizes pressure within the valve and reduces mechanical stress on components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high conveying speeds or rates are required, then productivity is improved, but mechanical stress on valve components increases leading to reduced service life
Solution Approach 1:
The patent applies pneumatic pressure equalization by introducing a pressure medium (gas or liquid) into the rotary valve chamber through a pressure medium introduction device. This equalizes the pressure between the inlet and outlet sides of the rotary valve, counteracting the pressure differential that causes mechanical stress on components during high-speed operation. The pressure medium acts on the bulk material and valve components to balance forces, allowing high conveying speeds without excessive mechanical stress.
2Productivity
If discharge pressure is applied to blow empty the cell, then conveying efficiency is improved, but pressure gradients increase material stress on valve components
Solution Approach 1:
The patent creates equipotential pressure conditions by introducing pressure medium into the rotary valve chamber to equalize pressure across different locations. Instead of allowing pressure gradients to form (which cause stress), the system maintains uniform pressure potential throughout the chamber, eliminating the harmful stress concentration on valve components while preserving the ability to discharge material efficiently.
3Productivity
If the rotary valve operates under high conveying pressure, then productivity is improved, but wear on drive shaft and cellular wheel increases
Solution Approach 1:
The patent uses pneumatic pressure equalization to counteract the mechanical stress caused by high conveying pressure. By introducing pressure medium into the rotary valve chamber, the system balances the pressure forces acting on the drive shaft and cellular wheel, reducing wear and extending maintenance intervals while maintaining high conveying pressure for improved productivity.
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 overpressure system reduces wear on the drive shaft and cellular wheel, enhances sealing effectiveness, and prolongs maintenance intervals by evenly distributing pressure, thereby increasing the service life of the rotary valve.
Implementation Method 1
The pressure device generates a gas (over)pressure at least in some areas, which counteracts or compensates for internal forces and moments, for example caused by the conveying pressure, in the valve in a stabilizing manner
Implementation Method 2
The overpressure, which in particular borders the shaft completely, counteracts pressure-induced deflection of the shaft, thereby reducing wear on the shaft and the wear on the cellular wheel arranged on the shaft
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
The invention relates to a rotary valve (1) for bulk materials, in particular for shotcrete. The rotary valve (1) comprises a rotary chamber (12), a rotary valve (3) arranged in the rotary chamber (12) which is rotationally fixed to a drive shaft (7), and at least one cover (11A, 11B) which delimits the rotary chamber (12). Sealing means (13) are provided between the cover (11A, 11B) and the rotary chamber (12) or between the cover (11A, 11B) and the rotary valve (3) for a tight seal between the cover (11A, 11B) and the rotary chamber (12). A pressure device is provided with which at least one cavity (21) arranged in or on the rotary valve (3), inaccessible to the bulk material, can be pressurized. The pressure device allows the sealant (13) and/or a sealant chamber (14) encompassing the sealant (13) to be pressurized with a sealant overpressure.