DE20010638U1 - Precipitation lock - Google Patents

Description

Rainfall barrier for a chimney

Description

Ventilation chimneys - usually called ventilation tunnels - are used to ventilate buildings and civil engineering structures. These are essentially vertical, free-standing steel chimneys that are used to draw in fresh air or to remove used air.

Since such ventilation chimneys are regularly installed vertically on building ceilings or roofs and the air flows in the axial direction of the chimney, rain, condensation or other precipitation could naturally penetrate into the ventilation system connected to the chimney.

To prevent this, deflector attachments are used on exhaust chimneys, although these are rejected by many architects for aesthetic reasons.

In the case of air supply chimneys, it is also known to close the chimney at the top and to arrange slats on its casing wall that divert the air flow essentially by 180°. Apart from the fact that such slats are complex and expensive, the diversion of the air flow leads to increased energy consumption due to friction and occasionally to noise.

Furthermore, the known solutions still have the problem that condensation that forms inside the chimney and settles on the chimney's inner wall can enter the ventilation system unhindered. Furthermore, the devices installed at the top of the chimney in the current state of the art make the chimney top-heavy.

From DE 297 20 620 Ul a ventilation chimney with a precipitation barrier according to the preamble of claim 1 is known, which largely avoids the above-mentioned disadvantages and is able to effectively collect both precipitation and condensate forming inside the chimney pipe and keep it away from the system connected to the chimney.

The present invention has the object of further improving the known precipitation barrier and simplifying its manufacture.

This object is achieved by the means specified in claim 1. The locking elements provided therein can be slotted or perforated sheet metal or plastic discs that are easy to manufacture and whose openings are offset from one another in such a way that

♦ *V*· »■· ·« «« ■♦«

are arranged in such a way that they do not allow vertically incident precipitation to pass through, while the supply and exhaust air can flow through the openings largely unhindered.

The development of the invention according to claim 2 is particularly expedient from the point of view of simple production.

The measure specified in claim 3 results in a closure against incoming precipitation and at the same time the largest opening cross-section for the supply and exhaust air is achieved.

The development of the invention according to claim 4 reduces the number of different components required for a complete precipitation barrier.

The designs according to claims 5 to 9 ensure that all precipitation, including that in the form of condensate settling on the inner wall of the chimney pipe, is reliably drained to the outside.

The arrangement in the lower chimney area is also advantageous in that vortex formation occurs in the upper part of the chimney, particularly in the case of storm turbulence, while the lower chimney area is an already calm zone, so that the precipitation barrier arranged here does not represent an additional source of noise in the event of turbulence; at the same time, it is located in an area in which precipitation essentially only falls vertically.

Finally, the arrangement according to claim 11 is also advantageous for static reasons because it shifts the centre of gravity of the chimney downwards.

Preferred embodiments of the invention are explained in more detail below with reference to the drawing, in which

Figure 1 is a schematic longitudinal section through a ventilation chimney with precipitation barrier, and

Figure 2 shows a section through the chimney along the line II.

The ventilation chimney shown in the drawing consists of a vertically arranged chimney pipe 10 that is open at the top and has a lower ring flange 11 for anchoring the chimney to a foundation or part of the building. The chimney pipe 10 is cylindrical from its lower to its upper end without any disturbing extensions, as are otherwise usual for achieving deflector effects.

»-».*■■♦♦♦ «■» ti ·» ".·

—3—

In the lower chimney area, slightly above the ring flange 11, a precipitation barrier, designated overall by 12, is installed in the interior of the chimney pipe 10, which has two essentially parallel disks 13, 14 and an annular trough 15 arranged underneath.

In the embodiment shown in the drawing, the two disks 13, 14 are square and are each attached to the chimney pipe 10 at their corners via a clamping device. In the embodiment shown, the clamping devices each consist of a threaded bolt 16 which passes through a corresponding hole in the chimney pipe 10 and engages in a threaded sleeve (not shown in detail) attached to the relevant corner of the disk 13, 14.

The two discs 13, 14 are provided with parallel elongated slots 17 and 18, respectively, the distance between the slots 17, 18 being slightly larger than their width.

Furthermore, as indicated by the dashed lines in Figure 2, the slots 18 in the lower disk 14 are offset by one pitch from the slots 17 in the upper disk, so that in the vertical projection, i.e. in the direction of the incident precipitation, each slot 17, 18 in one disk 13, 14 is aligned with a closed region of the other disk 14, 13.

The slots 18 of the lower pane 14 are provided with an upwardly facing, circumferential raised edge 19 on their edges. Instead of a raised edge, a flange part can also be welded in or inserted in some other way. The raised edge 19 prevents precipitation that reaches the lower pane 14 through the slots 17 of the upper pane 13 from falling further down through its slots 18.

As also shown in Figure 1, the two disks 13, 14 are installed in the chimney pipe 10 in such a way that their surfaces are slightly inclined relative to the horizontal, so that any precipitation that falls on them can run off the lower edge. Instead of being installed at an angle, the disks can be convexly curved upwards or have a funnel-like shape. Furthermore, the disks 13, 14 can also be round instead of the square shape shown. The number of slots is also not limited to that mentioned above, but can be selected depending on the chimney cross-section.

The ring trough 15 is formed by a truncated cone-shaped sheet metal ring, which is connected, preferably welded, at its lower edge to the inner wall of the chimney pipe 10. The cross section of the sheet metal ring

·» * S · · »it» ¹

_4

is dimensioned such that it covers the outer segment areas of the chimney cross-section left free by the disks 13, 14. Therefore, the precipitation running off the lower disk 14 reaches the annular trough 15 and from there to the outside through an outlet nozzle 20.

The ring pan 15 also catches all condensate that forms on the inner wall of the chimney pipe 10. Although not shown in Figure 1, the ring pan 15 is installed with a slight incline towards the outlet nozzle 20 so that it can be emptied as completely as possible.

In the illustration according to Figures 1 and 2, the upper pane 13 has a total of four slots 17, while the lower pane 14 has only three slots 18. It is also possible to provide both panes with the same number of slots and not to arrange them symmetrically to the vertical central axis as in Figure 2, but rather so that the central axis lies just next to a side edge of a slot. If these identically designed panes 13, 14 are installed rotated by 180° relative to one another, the entire chimney cross-section is blocked against precipitation.

Since the precipitation barrier according to the invention is divided into three stages, it has the advantage that the chimney diameter does not have to be enlarged at any point. Since the components are located inside the chimney, they are also protected against damage during transport, assembly work and other external influences and can therefore be designed relatively lightly.

Summary

A precipitation barrier 12 arranged inside a ventilation chimney and in its lower area consists of two disks 13, 14 arranged one below the other with slots 17, 18, which are arranged in such a way that the slots of one disk are aligned with closed areas of the other disk in the axial direction of the chimney pipe 10. At least the slots 18 of the lower disk 14 are provided with upwardly facing edges 19. A gap between the outer edges of the disks 13, 14 and the inner wall of the chimney pipe 10 is covered by an annular trough 15 arranged below the two disks 13, 14, which catches the precipitation running off the disks 13, 14 and the condensate collecting on the inner wall of the chimney and drains it outwards via an outlet nozzle 20.

Claims (9)

1. Precipitation barrier for a chimney with at least two barrier elements ( 13 , 14 , 23 , 24 ) arranged one below the other, each covering a partial area of the chimney cross-section and overlapping one another in the axial direction of the chimney, and a drainage device ( 15 , 20 ) arranged underneath and leading out of the chimney, characterized in that the barrier elements each have a disk ( 13 , 14 , 23 , 24 ) with openings ( 17 , 18 , 27 , 28 ), the openings of one disk being aligned with closed areas of another disk in the axial direction of the chimney, and that the openings ( 18 , 28 ) of at least the lowest disk ( 14 , 24 ) are provided with upwardly facing edges ( 19 , 29 ). 2. Precipitation barrier according to claim 1, characterized in that the opening edges are bent ( 19 , 29 ). 3. Rainfall barrier according to claim 1 or 2, characterized in that the openings are mutually parallel elongated slots ( 17 , 18 ). 4. Rain barrier according to one of the preceding claims, characterized in that both discs ( 13 , 14 , 23 , 24 ) are arranged identically and rotated by 180° relative to each other. 5. Precipitation barrier according to one of the preceding claims, characterized in that the discs ( 13 , 14 ) are substantially square and have devices ( 16 ) at their four corners for fastening to the chimney wall. 6. Rainfall barrier according to one of the preceding claims, characterized in that the discs ( 13 , 14 , 23 , 24 ) are inclined relative to the horizontal. 7. Precipitation barrier according to one of the preceding claims, characterized in that there is a distance between the circumference of each disc ( 13 , 14 , 23 , 24 ) and the inner wall of the chimney and the drainage device is an annular trough ( 15 ) which is tightly adjacent to the inner wall of the chimney and which is larger in the radial direction than the said distance. 8. Rainfall barrier according to claim 7, characterized in that the annular trough ( 15 ) is inclined relative to the horizontal. 9. Precipitation barrier according to one of the preceding claims, characterized in that the precipitation barrier is arranged in the lower chimney area.