Baffle Plate Flow Measurement in Wood Stove Ovens
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Solution Overview
Problem
Existing methods for measuring flow in wood stoves with induced draft fans are costly due to the need for complex differential pressure sensors to ensure sufficient draft through the combustion chamber, which is crucial for user health and emission reduction.
Innovation Solution
A device that accelerates combustion air by reducing its cross-section using a baffle plate, allowing for pressure or flow velocity measurements before and after the plate to control the induced draft fan, enabling the use of less precise and cheaper sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex differential pressure sensors are used to measure flow conditions, then measurement precision is improved, but device cost increases
Solution Approach 1:
The patent introduces a baffle plate as an intermediary element between the air supply and the measurement point. This baffle plate creates a controlled flow restriction that generates a measurable pressure differential, serving as a mediator that amplifies the flow signal without requiring complex sensors. The baffle plate acts as a flow controller that converts flow conditions into a measurable pressure difference using simple sensors.
Solution Approach 2:
The patent changes the physical parameter of the flow path by introducing a baffle plate with specific geometric dimensions (width 50-200mm, height 50-200mm) that creates a controlled restriction. This parameter change in the flow path geometry generates a measurable pressure differential that can be detected by simple pressure sensors, transforming the measurement requirement from complex flow measurement to simple pressure differential measurement.
2Speed
If the cross section of the air supply is reduced to accelerate air, then flow velocity increases, but pressure loss increases
Solution Approach 1:
The patent applies local quality by creating a specific flow restriction zone with the baffle plate having defined dimensions (width 50-200mm, height 50-200mm) at a specific location in the air supply path. This localized restriction creates a controlled area of high velocity and pressure differential, while the rest of the system maintains normal flow conditions. The baffle plate creates a localized flow pattern that generates measurable pressure differences without requiring system-wide pressure losses.
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 provides a cost-effective means to measure flow conditions, allowing for precise control of the draft while reducing the need for expensive sensors, ensuring adequate draft and emission reduction.
Implementation Method 1
The air is accelerated by reducing the cross section on a baffle plate. Measured values such as pressure or flow velocity can be determined at one point before and one point after the baffle plate
Implementation Method 2
This is associated with a pressure gradient between the baffle plate and any point within the device according to the invention, which is located in front of the baffle plate in the flow direction
Data Source
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AI summary
A device for measuring differential pressure in an oven, positioned so that combustion air must flow through it. Within the device, the air is accelerated by a cross-sectional reduction at a baffle plate. Measurements such as pressure or flow velocity can be determined at points before and after the baffle plate, and the resulting difference can be used to control the induced draft fan.