Mechanical Vacuum Throttle for Dense Phase Conveying
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Solution Overview
Problem
Current continuous dense phase pneumatic conveying systems face challenges in regulating air mass flow due to blower slippage and airlock leakage, requiring complex electrical or electromechanical controls.
Innovation Solution
A mechanically-controlled vacuum throttle system using an obstruction element and opening collar to vary air mass flow density, where the obstruction element moves relative to the opening collar in response to pressure changes, allowing for direct and immediate adjustment of air mass flow without the need for pressure and vacuum transducers or programmable logic controllers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrical or electromechanical controls are used to regulate air mass flow, then measurement precision and control accuracy are improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces electrical or electromechanical control systems with a purely mechanical vacuum throttle mechanism. The throttle uses a movable obstruction element (such as a needle valve or adjustable orifice) that is actuated by mechanical linkages responding to pressure differentials, eliminating the need for transducers, controllers, and electrical actuators while maintaining adequate control precision for air mass flow regulation
Solution Approach 2:
The mechanical vacuum throttle system is designed to self-regulate air mass flow based on pressure differentials across the throttle. The obstruction element automatically adjusts its position in response to pressure changes, creating a self-balancing control mechanism that eliminates the need for external power sources, sensors, or control algorithms
2Productivity
If complex pressure and vacuum transducers with programmable logic controllers are used, then air mass flow regulation is improved, but loss of time and system downtime increase
Solution Approach 1:
The patent eliminates electronic control components (transducers, programmable logic controllers, electrical actuators) that require calibration, maintenance, and can fail, replacing them with a robust mechanical throttle system that uses purely pneumatic actuation through pressure-differential-driven linkages, thereby reducing maintenance requirements and system downtime
Solution Approach 2:
The mechanical vacuum throttle provides continuous, uninterrupted air mass flow regulation through its passive mechanical design. The obstruction element continuously adjusts based on pressure differentials without requiring electronic signaling cycles, data processing, or power supply interruptions, ensuring uninterrupted material conveying operation
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 solution reduces system complexity, costs, and downtime by providing a more efficient and reliable method for maintaining a constant air-to-material mass flow ratio, ensuring stable and predictable slug wave form flow patterns in particulate material transport.
Implementation Method 1
the obstruction element moves relative to the opening collar in response to pressure changes
Data Source
AI summary
A mechanically-controlled vacuum throttle for a continuous dense phase pneumatic conveying system and related method is provided. The system includes a pneumatic conveyance line, a particulate material insertion assembly, a positive displacement blower, a transport fluid intake assembly, and a vacuum throttling assembly. The vacuum throttling assembly is configured to control the flow of air mass density into the blower and through the conveyance line. A portion of the vacuum throttling assembly is tied in to the conveyance line pressure downstream of the blower and adjusts the air mass density flow depending on the downstream pressure. Preferably, the vacuum throttling assembly includes an obstruction element and an opening collar, where the obstruction element is moveable relative to the opening collar and the air mass density flow is adjusted depending on the amount of movement of the obstruction element relative to the opening collar.