DE2557762A1 - Roof mounted extractor fan with horizontal discharge - has sound absorbing cylinders arranged vertically on discharge - Google Patents

Abstract

An extractor fan (3) is held within a housing with a base which fixes onto a roof curb. The housing has a lower section (1) which curves upwards and an upper covering section (1a) which curves downwards. These leave an annular gapbetween them on the outside of the housing and the fan discharges horizontally between them. A vertical cylindrical slab (2) of acoustically absorbing material is fixed to the edge of the lower section (1). A similar cylinder (2a) is fixed to the edge of the upper section (1a) radially outside the first cylinder so that there is a vertical annular gap between them. The discharged air is turned to flow through this gap which acts as a silencer. The vertical arrangement makes replacement easier.

Description

Böttner-Schilde-Haas AG U '

Büttner-Schilde-Haas Aktiengesellschaft, Krefeld-üerdingen

Roof vent for horizontal discharge

The invention relates to a roof ventilator for horizontal discharge, with an impeller of radial or axial design, this is done by a motor built into the housing fastened to a base plate or placed on it is driven, the housing in a series of largely identical or similar components exists and is provided with sound-absorbing elements.

It is known to dampen the sound of fans of the type mentioned, sound-damping scenes with vertical

To be installed horizontally at a distance from each other. By deliberately avoiding an air deflection, flow losses are avoided. Such soundproofing from fans is described, for example, in German Offenlegungsschrift 22 54 114.

709826 / 01-83

BüttiwScWUie-HaasAa

These fans with sound-absorbing elements have basically proven themselves. However, it was looking for a way wanted, "which facilitates the replacement or the subsequent installation of the elements on existing roof ventilators, while reducing the weight of the sound-absorbing elements.

According to the invention this object is achieved in that the sound-absorbing elements consist of cylindrical bodies that point upwards at the edge of the bottom part and are arranged under the hood part pointing downwards and one or more annular gaps between them form, wherein the arranged on the edge of the bottom part body arranged at a distance from the impeller and the hood part is. The distances between the cylindrical bodies and the inner cylindrical body and the impeller as well as the hood part are each in a certain ratio to one another.

By forming one or more annular gaps between the sound-absorbing bodies result in an air deflection, whereby the selected flow cross-sections and -guiding a pressure gain is achieved. With a significantly lower weight of the sound-absorbing body

709826/0163

Böttner-Schilde-Haas AG

the efficiency is much more favorable,

This can also contribute if the one on the hood part arranged cylindrical body has less strength than the cylindrical body arranged on the bottom part.

It is advantageous to have a cylindrical body on the outside of the edge of the bottom part and the other to arrange cylindrical body on the inside of the edge of the hood part. The cylindrical body can running parallel but preferably arranged vertically. It lends itself to the hood part as a hood part of a roof ventilator without soundproofing of the same type series with a larger diameter.

An embodiment of the invention is shown in the drawing and is described in more detail below. Show it:

Fig. 1 shows the vertical axial section through a roof fan with external rotor motor and round hood;

FIG. 2 like FIG. 1, but with an internal rotor motor; FIG.

FIG. 3 like FIG. 1, but with a square hood; FIG. . FIG. 4 shows the top view of the roof fan according to FIG. 3.

709826/0163

-Jt-

The fan housing consists essentially of the bottom part 1 and the hood part 1a, both of which have the same shell shape. The sound-absorbing elements are cylindrical bodies 2; 2a, which are arranged parallel and perpendicular, the cylindrical Body 2 on the outside of the edge of the bottom part 1 facing upwards and the cylindrical body 2a on the Inside of the edge of the hood part 1a are arranged pointing downwards. The hood part 1a is the hood part a roof fan of the same type series with a larger diameter. The "arranged on the hood part 1a cylindrical Body 2a is less thick than the body 2 arranged on the bottom part 1. The cylindrical body 2; 2a form an annular gap, the body 2 arranged on the edge of the bottom part 1 at a distance from the impeller and the hood part 1a is arranged. To achieve the desired efficiency, it is necessary that the mentioned distances are each in a certain ratio to each other.

In principle, according to the invention, cylindrical bodies can also be arranged on the suction side as sound-absorbing elements will.

Patent claims:

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709826/0 te 3

Claims (7)

L — J ^ U / LäJ · "415 Krefeld, December 17, 1975 PAT "- SCHI / wey - H 75/11 Büttner-Schilde-Haas Aktiengesellschaft, Krefeld-üerdingen Claims: M J Roof fan for horizontal discharge, with one impeller radial or axial design, which is built into the housing mounted on a base plate or is driven on this mounted motor, the housing in a series of largely consists of components of the same shape or of a similar shape and is provided with sound-absorbing elements, characterized in that the sound-absorbing elements consist of cylindrical bodies (2; 2a) which are arranged on the edge of the bottom part (1) pointing upwards and below the hood part (1a) pointing downwards and between them one or more annular gaps the, wherein the at the edge of the bottom part (1) arranged Body (2) at a distance from the impeller (3) and the cover part (1a) is arranged. 709826 / 0t63 - - fr- BSttnw-Schilda-HawAQ j £ 2. Roof vent according to claim 1, characterized in that that the distances between the cylindrical body (2) and the impeller (3), the hood part (1a) and the cylindrical Body (2a) are each in a certain ratio to each other. 3. Roof fan according to claim 1 and 2, characterized in that that the on the hood part (1a) arranged cylindrical body (2a) has less strength than that on Base part (1) arranged body (2). 4. Roof fan according to claim 1 to 3, characterized in that that the cylindrical body (2) on the outside of the edge of the bottom part (1) and the cylindrical Body (2a) are arranged on the inside of the edge of the hood part (1a). 5. Roof vent according to claim 1 to 4, characterized in that net that the cylindrical body (2; 2a) are arranged to run parallel. 709826 / 01-83 BüttiMr-Schlkte-HaMAG 3 6. Roof fan according to claim 5 _f, characterized in that the cylindrical body (2; 2a) are arranged vertically. ■ 7. Roof fan according to claim 1 to 6, characterized in that that the hood part (1a) is the hood part of an undamped Roof fan of the same type series is of larger diameter. 709826/0 1-