Spring-Driven Extractor Hood Vapor Screen with Damping Control
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Solution Overview
Problem
Existing extractor hoods lack a simple and cost-effective mechanism for smoothly transitioning the vapor screen between retracted and extended states, often requiring motorized drives or complex spring systems.
Innovation Solution
A spring-driven pull-out device with a guide rail and damping system, where the spring device prestresses the vapor screen for easy extension and locking, and a damping device ensures constant extension speed, eliminating the need for a motor drive and providing a compact, user-friendly design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a motorized drive system is used to move the vapor screen, then the transition between retracted and extended states is automated, but the device complexity and cost increase
Solution Approach 1:
The spring device automatically stores energy during the retraction phase and releases it during extension, enabling the vapor screen to move without external power sources. The system serves itself by converting the work done during retraction into the driving force for extension, eliminating motors and control systems.
Solution Approach 2:
The pull-out device operates in periodic cycles: during retraction, the spring is wound and stores energy; during extension, the spring unwinds and releases energy to move the screen. This periodic energy storage and release creates automated motion without continuous power input.
2Device complexity
If a spring-driven mechanism is used to move the vapor screen, then the construction is simpler and less expensive, but achieving smooth and controlled movement becomes more difficult
Solution Approach 1:
The damping device dynamically adjusts the extension speed of the vapor screen by providing velocity-dependent resistance. As the screen moves outward, the damping force increases to prevent excessive speed, ensuring controlled and smooth movement throughout the entire extension range while maintaining the simple spring-driven mechanism.
3Force
If the spring force is used to extend the vapor screen, then the push-in force is constant, but the extension speed may become uncontrollable
Solution Approach 1:
The damping device acts as an intermediary between the spring force and the vapor screen movement. It receives the constant force from the spring and transforms it into controlled motion by introducing velocity-dependent resistance, thereby mediating between the force input and the resulting speed output.
4Ease of operation
If the vapor screen is pushed into the housing like a drawer, then the retraction is simple, but the mechanism for extending it becomes more complex
Solution Approach 1:
The spring device performs preliminary action by storing energy during the retraction phase when the user pushes the screen in. This stored energy is then automatically released to perform the extension action, so the complex energy storage and release mechanism is activated in advance during simple retraction movements.
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 allows for a simple, inexpensive construction with a consistent push-in force and adjustable damping, enhancing ease of use and operational efficiency by enabling smooth, controlled movement of the vapor screen.
Implementation Method 1
the pull-out device having a spring device which prestresses the vapor deflector in the direction of the extended state
Implementation Method 2
the pull-out device has a damping device which dampens a movement of the vapor screen when it is shifted from the retracted state to the extended state
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Extractor hood (1), in particular a flat screen hood, with a vapor screen (3) and a spring-driven extension device (4) which is designed to move the vapor screen (3) from a retracted state to an extended state.