DD227209A1 - CONTROL VALVE FOR LIMITING THE AIR VOLUME FLOW - Google Patents

Abstract

The invention relates to a control flap for limiting the air volume flow in rooms or ventilation systems. It is the object of the invention to allow for a small differential pressure largely unimpeded air passage. This object is achieved according to the invention in that in an horizontal, preferably rectangular channel an angled isosceles flap is horizontally rotatably mounted in its inner edge and that downstream of the flap at the top of the channel is a right-angled stop. Stop and rotation axis are arranged so that the flow cross section can be closed by turning the flap.

Description

Control flap for limiting the air volume flow Field of use

The invention relates to a serbstregulieren.de device for limiting the volume of air volume in rooms or ventilation systems, the control flap is particularly applicable as Außenluftdurchlaßelement in space groups (apartments) with manhole ventilation and forced ventilation with exhaust systems, if on the one hand guarantees a minimum air change and on the other hand, a maximum air flow not exceeded to earth.

Characteristic of the known technical solutions

For the automatic regulation of air flow rates, it is necessary to use pressure differences for narrowing a control cross section with increasing differential pressure. "Circular, rotatably mounted control valves are known, which have asymmetrical recesses, so that the flow generates a torque in the closing direction * 'It remains always a partial cross-section for the passage of air free »Also known is a pendulum-like suspended control valve, which is deflected according to the upcoming total pressure difference, with the free cross section between the lower edge of the flap and a downstream slope is reduced * Another problem is that always a Minimum cross-section must remain free, so that the flap automatically opens again when pressure decreases. Thus, the control is possible only in a limited pressure range.

It has already been proposed to suspend a two-legged, unwound flap in a cylinder flowed across it. "The unequal pressures on both legs twist the flap against a spring force, blocking a specially shaped slot." This solution requires a considerable amount of effort ♦!

With a similar functional principle, an obtuse-angled flap and a control element with a circular segment cross section have been proposed, which are twisted by the flow against the spring force

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which reduces the free cross-section between the control element and the duct wall. Both solutions require vibration damping measures to counteract unstable closing behavior.

Object of the invention.

Based on the aforementioned deficiencies of the prior art, the object of the invention is: to provide a self-regulating device for limiting air flow rates for horizontal installation without having to use adjusting devices or vibration dampers and without having to guarantee a minimum cross section

Essence of the invention

The invention is based on the object, an air flow automatically limit ^ At low differential pressure largely unimpeded Luf tdurchtritt be possible * This object is achieved in that in a horizontal, preferably rectangular channel angled isosceles flap mounted horizontally rotatable in its inner edge is and that downstream of the flap at the top of the channel is a right Ansehlag »The stop and the axis of rotation of the flap are arranged perpendicular to the flow direction in such a way that the flow cross-section between the channel bottom and the stop edge can be closed by turning the flap, 'In this position, one leg of the flap is approximately parallel to the channel wall, with its rear edge touches the stop along the entire length *

In the range of small throughputs, the depending flap and the stop are flowed around with low pressure loss. ♦ The rising torque reduces the pressure resting on the upper side of the downstream flap leg. The resulting torque moves the flap counter to the force of gravity in the direction of view, reducing the free flow cross section and the pressure loss increasesV

p.

The theoretical limit of throughput is given by the flow velocity at which the downstream leg is horizontal »

Due to the almost wall-parallel position of this leg flow accelerations are avoided in the closing area, so that the flap according to the invention shows no tendency for plating ·

Ausführungsbeis-piel

The flap according to the invention will be illustrated with reference to two images. The drawings are longitudinal sections through the canal and show:

FIG. 1; the idle state Figure 2: the working state

The limit of the volume flow rate can be changed at the flap 1 by the choice of the leg length, the mass and the bending angle, the stop 2 by the choice of height and generally by the choice of the channel width * '

ι S ₃ Ji ₃ Drawings

Claims (1)

Brfindunflsans-Pruch Segel «Flap for limiting the flow of air, consisting of an angled isosceles flap and a right-angled stop, characterized in that the flap is freely rotatably mounted in its inner edge about a horizontal axis and that the stop is attached to the top of the flow channel downstream of the flap and that the flap and the stop are arranged perpendicular to the flow direction and that the flow cross section between the channel bottom and stop edge by turning the Flap can be closed and that in this position, a flap leg is almost parallel to the channel wall »with the stop and trailing edge of the leg touching the entire length»