Telescoping Downdraft Ventilator Layout for Low-Depth Oven Installations
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Solution Overview
Problem
Existing telescoping downdraft ventilators face challenges such as limited space compatibility, inefficient airflow due to multiple bends, high noise levels, inaccurate mechanical controls, susceptibility to environmental factors, lack of airflow detection, and limited adjustability, which restrict their effectiveness and versatility in modern kitchen setups.
Innovation Solution
A compact, electronically controlled telescoping downdraft ventilator with a low depth profile, featuring a sliding internal member, multiple fans for improved airflow, electronic controls for precise speed and height adjustment, integrated sensors for airflow detection, and lighting, allowing for installation behind a built-in oven and adjustable height settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a centrifugal fan/blower is used to draw air through multiple bends and turns, then air can be exhausted from the cook top, but large amounts of draw (vacuum/suction) are needed which requires a large motor increasing costs, noise, size and weight
Solution Approach 1:
Instead of using a centrifugal fan that pulls air through multiple bends creating high vacuum requirements, the patent uses an axial flow fan that pushes air directly through a streamlined path with minimal bends. This inversion of the airflow generation approach eliminates the need for high vacuum, reducing motor size, noise, and power consumption while maintaining effective air exhaust capability.
Solution Approach 2:
The patent employs curved streamline ducting that follows the natural flow path of air, eliminating sharp 90-degree bends. The curved transitions reduce turbulence and pressure losses, allowing the axial flow fan to move air efficiently without requiring excessive vacuum generation, thereby reducing noise and motor size.
2Productivity
If a centrifugal fan/blower is used with multiple bends and turns in the airflow path, then air can be exhausted, but large motor size is required which increases costs, noise, size and weight
Solution Approach 1:
The patent inverts the conventional approach by using an axial flow fan that generates positive pressure to push air through the system, rather than a centrifugal fan that creates negative pressure (vacuum). This inversion allows for a smaller, lighter motor since the axial flow fan does not need to overcome the high resistance created by multiple bends and turns.
Solution Approach 2:
The ventilation system is segmented into distinct functional zones: an axial flow fan section for generating airflow, a streamlined duct section for efficient air transport with minimal bends, and an exhaust section. This segmentation allows each component to be optimized independently, resulting in a lighter overall system.
3Length of moving object
If the ventilator depth is reduced to fit behind a built-in oven, then space compatibility is improved, but the available space for fan/blower and other components is limited
Solution Approach 1:
The patent inverts the conventional component layout by positioning the axial flow fan at the front of the housing rather than at the rear. This inversion allows for a more compact depth while maintaining effective airflow generation, as the fan can directly interface with the cook top surface without requiring long duct runs through the housing.
Solution Approach 2:
The patent merges the fan housing with the main ventilator housing into a single integrated unit, eliminating the need for separate remote fan housings and long duct connections. This merging reduces overall depth and simplifies the component arrangement, making the unit suitable for installation behind built-in ovens.
4Device complexity
If mechanical controls are used for speed and height adjustment, then the system is simpler, but control accuracy is poor and reliability is reduced due to susceptibility to environmental factors
Solution Approach 1:
The patent replaces mechanical control systems with electronic controls including electronic speed control for the fan motor and electronic height adjustment control for the telescoping section. These electronic systems provide precise control accuracy and are sealed to protect against environmental factors such as heat, steam, and grease, significantly improving reliability while maintaining reasonable complexity.
Solution Approach 2:
The patent incorporates feedback mechanisms in the electronic control system, including sensors that detect the position of the telescoping section and the speed of the fan motor. This feedback allows for precise control and automatic adjustment, improving both accuracy and reliability while protecting against environmental interference through sealed enclosures.
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 solution provides enhanced airflow efficiency, reduced noise, accurate control, improved durability against environmental factors, and increased versatility, enabling effective ventilation in tight spaces with adjustable height and lighting for improved usability.
Implementation Method 1
The air stream enters the box and flows directly to the rear exhaust opening. The axial flow fan located at the rear of the box forces air through the exhaust opening.
Implementation Method 2
The centrifugal fan creates higher pressures than an axial flow fan. The blower removes contaminated air from a cook top surface, removes the interior air of the box and either exhausts it outside or returns it to the room.
Implementation Method 3
There is also a telescoping rectangular box of some sort to open up the interior of the box for exhausting. Typically, there is about 13⁄4 inches in depth shown at the top when the ventilator cap is closed. Standard widths range from 27 inches to 48 inches.
Data Source
AI summary
A low depth telescoping downdraft ventilator controlled by an electronic controller providing a precisely controlled and efficient way of removing gases and fumes is disclosed. The low depth telescoping downdraft ventilator has the ability to fit behind a built-in oven placed below a cook top unit. The telescoping downdraft ventilator has an almost infinitely selectable range of heights above a cook top with a built in oven. The ventilator collects and draws in exhaust fumes and smoke, filters it and re-circulates or expels it either outdoors or indoors. The inner member of the telescoping ventilator may house the exhaust fans and may move up or down without the use of mechanical switches for elevation detection and stopping. The ventilator may have sensors to detect temperatures, filter change need, fan speeds, telescoping stop points, energy consumption, resistance and voltage, enabling programmable set point operation.