Baking Oven Outlet Throttle for Stable Steam Pressure
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Solution Overview
Problem
Conventional baking ovens face challenges in maintaining constant baking conditions due to the admixture of ambient air, which reduces steam saturation and energy recovery efficiency, especially when connected to energy recovery modules or under variable draft conditions.
Innovation Solution
A throttle valve is integrated into the gas flow path, allowing dynamic regulation of negative pressure at the outlet opening by measuring pressure before and after the throttle element, ensuring a constant or variable differential pressure to maintain optimal baking conditions independently of other ovens or energy recovery module operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a draft control flap is used to maintain constant negative pressure at the outlet opening, then the negative pressure can be adjusted to a constant value, but ambient air flows into the chimney causing steam saturation to decrease and energy recovery to reduce
Solution Approach 1:
The patent changes the control parameter from a draft control flap that opens to ambient air to a throttle valve that regulates the outlet opening itself. This parameter change allows maintaining constant negative pressure while preventing ambient air admixture, thereby preserving steam saturation and energy recovery efficiency.
Solution Approach 2:
The throttle valve acts as an intermediary element between the baking chamber and the external environment. Instead of allowing direct mixing with ambient air through an open flap, the throttle valve mediates the pressure control while maintaining the integrity of the steam atmosphere, enabling energy recovery.
2Stability of the object's composition
If a draft control flap with opening resistance is used to regulate negative pressure, then the negative pressure can be set to a constant value, but the vapor's physical properties change due to inflowing ambient air reducing steam saturation
Solution Approach 1:
The invention changes the operational parameter from using a draft control flap that inherently mixes ambient air to a throttle valve that controls the outlet opening directly. This allows maintaining constant negative pressure while preserving the physical properties of the vapor, specifically steam saturation, by preventing ambient air infiltration.
3Loss of energy
If multiple ovens are connected to a common energy recovery module, then energy recovery can be achieved, but the negative pressure at each outlet opening fluctuates depending on the operating point of the energy recovery module
Solution Approach 1:
The patent segments the pressure control for each oven independently using individual throttle valves at each outlet opening. This segmentation allows each oven to maintain its own constant negative pressure regardless of the operating conditions of the common energy recovery module or other connected ovens, ensuring stable baking conditions while enabling energy recovery.
4Loss of energy
If the draft control flap is moved into the flow cross section for outflowing gases, then ambient air admixture is prevented and steam saturation is maintained, but the flow resistance of gases in the channel must be dynamically regulated
Solution Approach 1:
The invention changes the control mechanism from a simple draft control flap to a dynamically adjustable throttle valve positioned in the flow cross-section. This parameter change enables prevention of ambient air admixture while providing dynamic regulation of flow resistance through controlled opening degrees, maintaining both energy recovery and baking conditions.
Solution Approach 2:
The system employs feedback control where the throttle valve opening degree is adjusted based on measured pressure values to maintain constant negative pressure. This feedback mechanism manages the flow resistance dynamically while preventing ambient air infiltration, thereby preserving steam saturation and enabling energy recovery.
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 ensures consistent baking conditions and maximizes energy recovery by preventing ambient air admixture, allowing for precise control of negative pressure and flow resistance, thereby maintaining steam saturation and energy efficiency.
Implementation Method 1
it changes the flow resistance of the gases in the channel carrying the outflowing gases
Implementation Method 2
a first pressure sensor, which is arranged on the side of the throttle element facing the baking chamber, sends a measurement signal to the control unit
Data Source
AI summary
The invention relates to a baking oven with a baking space, which is provided with an outlet opening, through which the gases can escape from the baking space. It is an object of the present invention to ensure constant baking conditions while avoiding the mixing of air from the surroundings with the outflowing gases. This objective is accomplished owing to the fact that a throttle element (7) for varying the flow cross section for the outflowing gases is disposed in the area of the outlet opening and coupled with a driving mechanism (8) controlled by a regulating module (9), and that a first pressure sensor (12), which is connected with the control module (9), is disposed on the side of the throttle element (7) facing the baking space.