Jet ventilator

Abstract

The invention relates to a jet ventilator (10) having a ventilator unit with a circular inner contour and having at least one sound damper (22, 26) which is fluidically connected to the ventilator unit. According to the invention, the at least one sound damper (22, 26) has a substantially circular inner contour (62) and an elliptical outer contour (64). The circular arc segments extending between the circular inner contour (62) and the elliptical outer contour (64) have different radii.

Description

[0001] DESCRIPTION

[0002] jet fan

[0003] TECHNICAL FIELD

[0004] The invention relates to a jet fan for ventilation and smoke extraction of buildings such as, in particular, parking garages, garages and tunnels.

[0005] STATE OF THE ART

[0006] Jet fans are well-known for the ventilation and smoke extraction of buildings. Jet fans are typically attached to the structure using several mounting elements. The arrangement and number of jet fans required depends on the spatial characteristics of the building to be ventilated.

[0007] Jet fans have a fan unit that generates an airflow through the structure. Typically, several jet fans are used to ensure the generated airflow flows through the entire structure. This allows the airflow to enter the tunnel at one end and exit at the other, for example. This allows both the supply of fresh air and the removal of exhaust gases.

[0008] Jet fans typically have at least one silencer; preferably, a silencer is provided on both the inlet and outlet sides of the fan unit. This minimizes the noise pollution caused by the jet fan's operation.

[0009] Typically, jet fans are installed in the ceiling area of ​​a building. They reduce the maximum clear height of the structure. This is particularly important in tunnel construction and the construction of parking garages and parking lots, as the height of the structures should generally be kept as low as possible for cost reasons. At the same time, sufficient distance between the jet fans and vehicles driving through the structure is required for safety reasons.

[0010] Jet fans are known from DE 10 2004 041 696 B4 and EP 2 387 670 Bl, the silencer of which is flattened on the inflow side, so that a flatter design can be realized.

[0011] PRESENTATION OF THE INVENTION

[0012] Based on this prior art, the object of the invention is to provide an improved jet fan which is as flat as possible and at the same time has the highest possible thrust efficiency.

[0013] The jet fan according to the invention is defined by the features of main claim 1. Useful developments of the invention are the subject of further claims following this claim.

[0014] The jet fan according to the invention has a fan unit with a circular inner contour and at least one silencer that is connected to the fan unit in terms of flow. According to the invention, the at least one silencer has a substantially circular inner contour and an elliptical outer contour. The circular arc segments running between the circular inner contour and the elliptical outer contour have different radii. Due to the elliptical outer contour, the silencer can be constructed significantly flatter than conventional silencers, so that the jet fan is flatter and more compact overall. Thus, with comparable silencer performance, the jet fan protrudes less into the building structure, so that the clear height of the building - when the jet fan is mounted on the building ceiling - is reduced less than in the prior art.In the jet fans known from the prior art, all arc segments have identical radii. This results in either a correspondingly large jet fan design with a constant large radius, or a correspondingly lower efficiency with a constant small radius. If the jet fans are designed with a flattened design, the silencers are simply cut off at their top and / or bottom and covered with a flat sheet of metal.

[0015] In the jet fan according to the invention, however, the elliptical outer contour provides a smaller radius in the upper and lower peripheral areas, while the lateral peripheral areas have a larger radius. This allows the jet fan according to the invention to be constructed relatively flat while maintaining high efficiency.

[0016] Preferably, the radius of the circular arc segments can change continuously. This creates smooth transitions in the muffler area, preventing unwanted turbulence that could potentially reduce efficiency.

[0017] Preferably, the jet fan may have an inlet and an outlet silencer. In this case, both silencers may have a substantially circular inner contour and an elliptical outer contour.

[0018] In a particularly preferred embodiment, an inlet nozzle can be provided, to which the inlet silencer is connected on the downstream side. In this case, the inlet silencer can preferably have a substantially circular inner contour and an elliptical outer contour. Accordingly, the inlet nozzle can have an elliptical inner contour on the upstream side and a substantially circular inner contour on the downstream side. The circular inner contour of the inlet nozzle can be adapted to the inner contour of the inlet silencer so that the most optimal air flow can be generated by the steel fan. The inlet nozzle can thus ensure that the air flow is compressed from the original elliptical inner contour to the substantially circular inner contour.

[0019] Preferably, at least one fastening element can be provided by which the jet fan can be attached to a structure, in particular to a building ceiling. The at least one fastening element can in particular be arranged on the fan unit.

[0020] The at least one fastening element can preferably be arranged on an outer side of the jet fan that is aligned with one of the two less curved outer sides of the at least one silencer. In this way, this less curved outer side of the at least one silencer can be directed toward the structure—in particular toward the building ceiling—when the jet fan is mounted. The jet fan can thus be mounted in a particularly compact and space-saving manner.

[0021] Further advantages and features of the invention can be found in the features further specified in the claims and in the following exemplary embodiment.

[0022] SHORT DESCRIPTION OF THE DRAWING

[0023] The invention is described and explained in more detail below with reference to the exemplary embodiment shown in the drawing. In the drawings:

[0024] Fig. 1 is a perspective exploded view of the jet fan according to the invention with two silencers,

[0025] Fig. 2 is a longitudinal section through the jet fan according to Fig. 1,

[0026] Fig. 3 is a perspective view of the inlet nozzle of the jet fan according to Fig. 1, Fig. 4 is a plan view of the inlet nozzle according to Fig. 3,

[0027] Fig. 5 a section through the inlet nozzle according to Fig. 4 along the line

[0028] AA and

[0029] Fig. 6 shows a section through the inlet nozzle according to Fig. 4 along the line BB.

[0030] WAYS TO CARRY OUT THE INVENTION

[0031] Figs. 1 and 2 show a schematic representation of a jet fan 10. The jet fan 10 has an inlet nozzle 20, an inlet silencer 22, a fan unit 24, and an outlet silencer 26, which are arranged one behind the other in the flow direction 28. In contrast to the embodiment shown here, one of the two silencers 22, 26 could also be omitted.

[0032] The fan unit 24 has a housing shell 30 that encloses a circular, cylindrical, straight interior space 32. The fan unit 24 thus has a circular inner contour and a circular outer contour. A flange 34, 36 is attached to the housing shell 30 on its inflow and outflow end walls. These flanges 34, 36 can be used to connect a silencer 22, 26 to the housing shell 30 and thus to the fan unit 24.

[0033] The fan unit 24 has an axial impeller 40 with a plurality of circumferentially distributed blades 42. The blades 42 are attached to an impeller hub 44 arranged in the interior 32 of the fan unit 24. The impeller hub 44 is connected to the motor drive shaft 46 by means of a key and can thus be set in rotation. On the downstream side of the axial impeller 40 - in contrast to the exemplary embodiment shown here - a guide device with a plurality of circumferentially distributed, stationary guide vanes can be connected. In this case, the flow leaving the axial impeller 40 then flows through the area of ​​the guide device. The flow leaving the axial impeller 40 in a diagonal direction is deflected into an axial flow direction by the guide vanes.

[0034] In the present example, the jet fan 10 is attached to a structure using several fastening elements 50. A total of four such fastening elements 50 are present in the present example to enable stable attachment. The fastening elements 50 are each arranged on the fan unit 24. In the present example, the fastening elements 50 are attached at one end to the outer side 52 of the housing shell 30. With their free end 54, the fastening elements 50 can be attached, for example, to a building ceiling in order to mount the jet fan 10.

[0035] The two silencers 22, 26 each have a housing shell 60 that has a circular inner contour 62 and an elliptical outer contour 64. The housing shell 60 is therefore not uniformly thick; rather, the housing shell 60 is significantly thicker at the two side regions 66, 68 facing the fastening elements 50 than at the regions in between. These thinner regions of the housing shell 60 are aligned approximately parallel to the building ceiling when installed. Thus, the two silencers 22, 26 are flatter and thus more compact, while achieving comparable performance, than with a uniformly thick housing shell.

[0036] The inlet-side silencer 22 is equipped with an inlet nozzle 20. This inlet nozzle 20 has an elliptical outer contour 70, which is adapted to the elliptical outer contour 64 of the housing shell 60 of the silencer 22. This results in a visually uniform appearance of the jet fan 10. On the inlet side, the inlet nozzle 20 has an elliptical inner contour 72, which is adapted to the elliptical outer contour 64 of the housing shell 60 of the silencer 22 and thus also to the elliptical outer contour 70 of the inlet nozzle 20. On the outflow side, in contrast, the inlet nozzle 20 has a circular inner contour 74, which is adapted to the circular inner contour 62 of the housing shell 60 of the silencer 22. This enables an optimal flow of air through the jet fan 10 without causing turbulence in the transition area between the inlet nozzle 20 and the silencer 22.

[0037] Due to the circular inner contour 74 and the elliptical outer contour 72, the radii 76, 76' of the circular segments 78, 78' differ between the inner contour 74 and the outer contour 72 (see Fig. 5 and 6). In the lateral region of the inlet nozzle 20 (see Fig. 6), the radii 76 of the circular arc segments 78 are significantly smaller than the radii 76' of the circular arc segments 78' in the upper and lower regions of the inlet nozzle 20 (see Fig. 5). In the present example, the radii 76 of the circular arc segments 78 in the lateral region of the inlet nozzle 20 are the smallest overall. The radii continuously increase towards the top and bottom until the radii 76' of the circular arc segments 78' in the upper and lower regions of the inlet nozzle 20 have reached their maximum.

Claims

CLAIMS 01. Jet fan (10), - with a fan unit (24) having a circular inner contour, - with at least one silencer (22, 26) which is connected to the fan unit (24) in terms of flow, - characterized in that - the at least one silencer (22, 26) has a substantially circular inner contour (62) and an elliptical outer contour (64), - the circular arc segments (78, 78') extending between the circular inner contour (62) and the elliptical outer contour (64) have different radii (76, 76').

02. Jet fan according to claim 1, - characterized in that - the radius (76, 76') between the circular inner contour (62) and the elliptical outer contour (64) changes continuously in terms of circumference.

03. Jet fan according to claim 1 or 2, - characterized in that - there is an inflow silencer (22) and an outflow silencer (26).

04. Jet fan according to claim 3, - characterized in that - both silencers (22, 26) have a substantially circular inner contour (62) and an elliptical outer contour (64).

05. Jet fan according to one of the preceding claims, - characterized in that - an inflow-side silencer (22) is provided which has a substantially circular inner contour (62) and an elliptical outer contour (64).

06. Jet fan according to claim 5, - characterized in that - an inlet nozzle (20) is provided which is located on the inlet side of the inlet silencer (22), - the inlet nozzle (22) has an elliptical inner contour (72) on the inlet side and a substantially circular inner contour (74) on the outflow side, which is adapted to the inner contour (62) of the inlet-side silencer (22).

07. Jet fan according to one of the preceding claims, - characterized in that - at least one fastening element (50) is provided by which the jet fan (10) can be fastened to a building.

08. Jet fan according to claim 7, - characterized in that - at least one fastening element (50) is arranged on the fan unit (24).

09. Jet fan according to claim 7 or 8, - characterized in that - the at least one fastening element is arranged on such an outer side of the jet fan (10) that it is aligned with one of the two less curved outer sides of the at least one silencer (22, 26).

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