Capture Hood Airflow Layout With Negative-Pressure Induction
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Solution Overview
Problem
Conventional collection hoods with only suction have a limited range, resulting in a significant portion of exhaust air remaining in the vapor chamber and not being immediately vacuumed, leading to inefficient capture and extraction.
Innovation Solution
Incorporating a vacuum chamber between the vapor and air supply chambers, with a wall having multiple openings along the induction area to induce a negative pressure, enhancing the upward deflection of the air flow through the curved deflection area and increasing the gradient of the exiting air flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a curved deflection area is designed with corresponding geometry to direct air flow upwards, then the gradient of exiting air flow should increase, but turbulence occurs and the inner radius becomes dead of flow, resulting in insufficient incline
Solution Approach 1:
A vacuum chamber is introduced as an intermediary component between the vapor chamber and air supply chamber. This vacuum chamber, accessed through openings in the induction area wall, acts as a mediator to extract exhaust air from the curved deflection area, preventing turbulence and dead flow zones while maintaining effective upward air flow gradient.
Solution Approach 2:
The invention extracts exhaust air directly from the curved deflection area through the vacuum chamber's suction openings. This extraction mechanism removes the problematic accumulated air that would otherwise cause turbulence and dead flow, while the vacuum chamber itself is taken out of the traditional chamber arrangement and integrated into the side wall structure.
2Ease of operation
If supply air is blown into the air supply chamber from above, then air flow is generated across the vapor chamber, but the air flow cannot be directed obliquely upwards without causing turbulence in the curved deflection area
Solution Approach 1:
The vacuum chamber serves as an intermediary that facilitates upward air flow direction without requiring acute angle deflection. By providing a separate extraction path through the side wall openings, it mediates between the horizontal supply air flow and the desired upward extraction, eliminating turbulence while maintaining operational simplicity.
3Productivity
If a vacuum chamber is added to enhance upward deflection of air flow, then extraction efficiency improves, but device complexity increases
Solution Approach 1:
The vacuum chamber is designed with multi-functionality: it serves as both a structural component of the collection hood and an active extraction mechanism. The side wall with openings integrates the vacuum chamber into the existing chamber arrangement, allowing it to perform both flow direction control and exhaust extraction functions simultaneously, thereby reducing the impact of added complexity.
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 configuration increases the gradient of the exiting air flow by 10° to 15°, significantly improving the efficiency of the collection hood by providing an additional upward component to the air flow direction, leading to faster extraction of exhaust air.
Implementation Method 1
the supply air, which flows through the air supply chamber from top to bottom, is accelerated by its tapering structure and passes through the wall of the induction area at a relatively high flow rate. As a result, a negative pressure is induced in the adjoining negative pressure chamber via the openings in this wall
Implementation Method 2
which in turn causes a suction effect in the deflection area into which the suction opening opens via the suction opening
Data Source
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AI summary
The present invention relates to a capture hood for capturing the waste air above cooking points, production devices and the like, comprising a vapour chamber, a suction-extraction chamber and an air-supply chamber, said chambers extending horizontally and parallel to one another in a longitudinal direction, wherein - the vapour chamber is open at the bottom and tapers toward the top, - the suction-extraction chamber is separated from the vapour chamber by a filter or a separator, wherein the filter or the separator forms an inclined boundary of the vapour chamber which tapers toward the top, and - the air-supply chamber tapers toward the bottom and merges at its lower end with a curved deflection region which issues into a blow-out opening which is arranged at the lower end of the vapour chamber opposite the suction-extraction chamber such that feed air which is blown into the air-supply chamber from above exits from the blow-out opening horizontally or obliquely upward in the direction of the filter or of the separator. The capture hood further comprises a negative-pressure chamber which is arranged between the vapour chamber and the air-supply chamber, wherein the negative-pressure chamber is closed on all sides with the exception of a suction opening at its lower end, said suction opening issuing, in the region of the inside radius of the curved deflection region of the air-supply chamber, into said deflection region, and wherein the negative-pressure chamber and the air-supply chamber are separated from one another along an induction region, which adjoins the suction opening or the deflection region at the top, by a wall which has a plurality of individual apertures which are arranged in succession in the longitudinal direction of the capture hood.