EP2597391B1 - Wall sleeve with impact damper - Google Patents

Description

The invention relates to a wall box with a guide tube and a ventilation opening on the guide tube and arranged at the end of the guide tube, movable between a closed position and an open position closure lid on the inside of a hyperbolic flow body is formed by the closure lid axially guided on guide arms in the guide tube and mounted thereon as a funnel-shaped ring streamlined trained guide body, the funnel first inside parallel to a central axis of the guide tube and then widens so that the air flow is then deflected by about 70 ° from the central axis to the outside, and the closure cap, driven by the air flow in the guide tube, which is formed by the pressure difference between the air pressure in the guide tube and the outer ambient air, automatically opens and closes against a restoring force and thus directs the air flow to the edge of the cap and to the outside with minimal pressure loss.

Wall boxes serve to ventilate rooms, such as kitchens, by means of a fan and an outwardly leading guide tube, which is closed with a closure lid. With the new Energy Saving Ordinance EnEV 2009, which came into force on 01.10.2009, stricter energy standards for buildings were defined. Permanently opened wall boxes no longer meet the new requirements for building impermeability. On the other hand, airtight closed wall boxes reduce the heat losses close to zero when the extractor hood is switched off.

Such a hermetically sealed wall box is in the patent EP 1 921 394 B1 disclosed. In this case, flow-optimized components of the wallbox system use the pressure effect of the airflow generated in extractor hood operation in conjunction with mechanically controlled spring and magnetic force when opening and Closing the closure lid. By the energy of the air flow when opening the cap automatically moves on the guide arms and the restoring force of a tension spring causes the automatic closing of the cap. Thus, the closure lid closes the wall box airtight and flush with switched-off hood, so that no cold bridge on the outer wall is formed. The wallbox system works without the supply of electrical energy because it dispenses with electrically operated accessories. When opening automatically, the extension path is limited by end stops on the ventilation opening of the guide tube. Disadvantageously, the entire kinetic energy that contains the closure lid and all components directly connected thereto due to its movement, quasi destroyed or dissipated upon impact with the end stops within the wall box. This leads, in particular with very strong air flow through powerful extractor hoods, to very large impact forces and thus to problems due to distortion within the body structure of the wall box and to unpleasant noises.

The invention is therefore an object of the invention to provide a generic wall box, in which the extension path of the closure lid is delayed relatively gentle and so attenuated or prevented an impact on the end stops on the vent opening of the guide tube.

This object is solved by the features of claim 1. Embodiments of the invention are described in the subclaims.

In the case of the wall box of the generic type, the closure lid automatically moves out due to the energy of the air flow, wherein the closure lid is guided axially on guide arms in the guide tube. The extension path of the closure cap with the flow body mounted on the inside is limited by an end stop on the ventilation opening of the guide tube. The total kinetic energy that the closure lid contains with the flow body mounted on the inside due to its movement is delivered to the wall box system upon impact with the end stop and absorbed by it.

With the wall box according to the invention the Ausfahrweg of the closure lid when opening after a first stop by an additional braking force at the end of the extension path is relatively gently delayed and thus prevents or attenuates an impact on an end stop on the vent opening of the guide tube.

The restoring force is formed by a tension spring on a pivot lever which is articulated to the inner wall of the guide tube and whose path is limited on one side by the first stop as a pivot lever stop. The other side of the pivot lever is connected via a connecting wire to the flow body. This achieves the restoring force for the closure lid.

The braking force is effected by a spring which acts on the center of the flow body. Upon impact of the pivot lever on the first stop, the moving flow body is not stopped abruptly, but relatively gently delayed by a spring which absorbs the kinetic energy of the moving mass.

The opening width of the wall box is determined by the end stop at the ventilation opening of the guide tube, regardless of how strong the air flow is through a driving extractor hood. After the pivot lever has reached the pivot lever stop, the remaining energy is absorbed by the spring. If the spring does not absorb enough kinetic energy from the moving mass of the closure cap, it bounces on the end stop at the vent opening of the guide tube at the end of the extension travel at a correspondingly reduced speed.

In a preferred embodiment, the spring is a compression spring which is mounted in the inner cavity of the flow body. In this case, one end of the compression spring extends axially through the cylindrical interior of the spring and is then connected via the connecting wire with the pivot lever, which is articulated on one side on the inner wall of the guide tube. The tip of the hyperbolic surface formed at the center of the flow body includes an opening through which this end of the compression spring protrudes. The opening of the flow body has on the inside of a paragraph on which the opposite end of the spring is supported.

The projecting from the flow body end of the compression spring is connected to the pivot lever. As a result, the preloaded compression spring is compressed after hitting the pivot lever stop and thereby absorbs the kinetic energy of the flow body, similar to a damper. This dampens the impact on the end stops at the vent hole of the guide tube and prevents the kinetic energy otherwise released on impact with the wall box from being transformed into deleterious work of deformation or being transmitted within the wall box system.

The absorbed kinetic energy is not degraded in the compression spring, but implemented in a backward movement of the flow body. Accordingly, the absorbed kinetic energy in the closing direction of the closure cap against the air flow is released by the compression spring again. The opening width of the wall box will adapt to the individual airflow of the cooker hood.

A development of the invention provides that the compression spring with the connecting wire forms a unit, that is made of a continuous piece of spring steel.

Advantageously, the invention provides that the compression spring brakes the closure lid on the last part of the extension path and thus avoids an impact on the end stop. This prevents the entire kinetic energy absorbed by the impact from being transmitted within the wall box.

Fig. 1

den Querschnitt eines Mauerkastens in der Offenstellung.

Fig. 2

den Mauerkasten aus Fig. 1 in der Schließstellung.

The invention is explained below by way of example with reference to preferred embodiments with reference to the figures. Showing:

Fig. 1

the cross-section of a wall box in the open position.

Fig. 2

the wall box off Fig. 1 in the closed position.

Fig. 1 shows an advantageous embodiment of the wall box 1 according to the invention in the open position, Fig. 2 shows the wall box 1 in the closed position. The wall box 1 is shown with its guide tube 2 in the wall 4. The closure lid 5 with the attached to the inside flow body 6 is brought against a restoring force by the air flow 12 in the open position and held there with the hood turned on. The restoring force is applied by a prestressed tension spring 18, which is attached to a pivoting lever 16, which in turn is mounted in the pivot bearing 17.

The pivot lever 8 can be moved until one side 16 of the pivot lever 8 abuts the first stop 20. The stopper 20 is fixedly mounted on one side on the inner wall of the guide tube 2. As a result, the first opening width of the wall box 1 is fixed when the flow body 6 or closing lid 5 strikes the stop 20.

Inside the flow body 6, the compression spring 21 is mounted, wherein the one end of the compression spring 21 is supported on an inner shoulder of the flow body 6. The other end of the compression spring 21 is part of the connecting wire 9. In this way, the compression spring 21 takes after the impingement of the pivot lever (8) on the pivot lever stop (20), the kinetic energy of the flow body 6 and the closure lid 5, and gives them in the Closing direction, against the air flow 12, again, so that the extension path, especially on its last section, is gently delayed. As a result, the opening width of the wall box 1 adapts to the individual air flow 12 of an extractor hood.

reference numeral

1

wall box

2

guide tube

3

ventilation pipe

4

Wall

5

cap

6

flow body

7

guide

8th

pivoting lever

9

connecting wire

10

feather

11

poetry

12

airflow

13

camp

14

conducting body

15

Hyperbolic surface

16

Side of the pivoting lever

17

pivot bearing

18

mainspring

20

First stop, swiveling lever stop

21

compression spring

30

flange

31

magnets

32

end stops

Claims (6)

1. A wall sleeve with a guide pipe and a vent in the guide pipe (2) and a cover (5) positioned at the end of the guide pipe which can move between a closed position and an open position, and on the inside of the cover a hyperbolically shaped flow body (6) is constructed, with the cover running axially along guide arms in the guide pipe (2) and with a guide body (14) constructed as a streamlined, funnel-shaped ring attached to the cover, whereby internally, the funnel initially runs parallel to the central axis of the guide pipe (2) and then opens out in such a way that it deflects flow of air outwards from the central axis by 70°, and the cover (5), pushed by the flow of air in the guide pipe which is formed by the difference in pressure between the air pressure in the guide pipe (2) and the external ambient air, opens and closes independently against a restoring force, thus guiding the flow of air to the edge of the cover (5) and into the open air with a minimum loss in pressure, characterized in that
   the restoring force is created using a tension spring (18) on a swivel arm (8), which is mounted to the inside of the guide pipe (2) by means of a hinge, and its path is limited on one side by the first stopper (20), and the other side of the swivel arm is connected to the flow body (6) via a connecting wire (9), and that when opened, the cover's (5) motion is relatively smoothly decelerated after an initial stopper (20) by an additional braking force which is triggered by a spring, which is attached to the central point of the flow body (6) and absorbs the cover's kinetic energy, thus preventing or dampening an impact on the end stop (32).
2. A wall sleeve according to claim 1, characterized in that
   the spring is a compression spring (21) which is fitted to the inside of the flow body (6).
3. A wall sleeve according to claim 1, characterized in that
   the compression spring (21) is connected to the swivel arm (8) via a connecting wire (9).
4. A wall sleeve according to claim 1, characterized in that
   the kinetic energy absorbed by the spring is converted into a reverse motion of the flow body (6).
5. A wall sleeve according to claim 3, characterized in that
   the compression spring (21) forms one unit with the connecting wire.
6. A wall sleeve according to claim 1, characterized in that
   the spring decelerates the cover (5) in the final part of its path of motion.

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