Modular fan unit

Abstract

A modular fan unit of a diagonal and/or axial fan having a housing that includes an inlet opening and an outflow opening. The housing accommodates a fan, that conveys the air at least in the axial direction and is divided perpendicularly to an axis (X-X) of the fan into at least two housing halves that are joined together. The housing forms a chamber in which the blades of the fan rotate around an axis and has a circumferential edge area in the vicinity of which the housing has a thickness B extending in the axis direction of the fan. A motor holding part has a dimension R as the maximum extension in the edge area and the chamber has an extension in the axis direction of the fan at a height of a dimension L, whereas the extension of the air inlet part has a dimension T in the area of the chamber. A ratio of the dimension B to the dimension R with respect to the ratio of the dimension L to the dimension T is within the range from 0.9 to 1.2. The noise emission of the fan during operation is minimized and the outer diameter of the modular fan unit is kept to a minimum.

Claims

1. A modular fan unit, comprising a housing that has been provided with an inlet opening and an outflow opening and a fan that is accommodated in the housing and that conveys air at least in the axial direction, whereby the housing is divided perpendicularly to the axis of the fan into at least two housing halves that are joined to each other, namely, a motor holding part and an air inlet part, and whereby the housing forms a chamber in which blades of the axial fan are accommodated so as to rotate around the axis of the axial fan, and the housing also has a circumferential edge area in the vicinity of which the housing has a thickness having a dimension B extending in the axis direction of the axial fan, and the motor holding part has a dimension R as the maximum extension in the edge area in the axis direction of the fan, and moreover, the chamber has an extension in the axis direction of the fan at the height of the dimension L, and the extension of the air inlet part in the axis direction of the fan has a dimension T in the area of the chamber, wherein a ratio of the dimension B to the dimension R with respect to the ratio of the dimension L to the dimension T is governed by the equation B/R=b*L/T and b is within the range from 0.9 to 1.2.

2. The modular fan unit according to claim 1, wherein a diameter D.sub.K of the chamber is approximately 4% larger than an outer diameter D of the fan runner.

3. The modular fan unit according to claim 1, wherein the housing, as seen in a top view, has an essentially rectangular outer contour.

4. The modular fan unit according to claim 1, wherein a the motor holding part and the air inlet part each have a set-back dimension E, whereby a set-back depth, as the ratio of the set-back dimension E to a maximum axial extension C of the housing in the axis direction of the fan, is within the range from 0.2 to 0.35.

5. The modular fan unit according to claim 1, wherein a ratio of a maximum outer dimension K of the housing to an impeller diameter D is 1.15 at the maximum.

6. The modular fan unit according to claim 1, wherein the housing has a circumferential wall ring, whereby the wall ring has a circumferential hollow chamber.

7. The modular fan unit according to claim 6, wherein the circumferential hollow chamber is formed in an edge area of the air inlet part and/or in an edge area of the motor holding part.

Description

(1) The FIGURE shows the following:

(2) FIG. 1 a modular fan unit according to the invention, in a cross-sectional view.

(3) FIG. 1 shows a cross-sectional view through the modular fan unit according to the invention. The modular fan unit 100 has a housing 110 that has been provided with an inlet opening 131 and an outflow opening 121. The housing 110 is configured as a housing with an essentially square outer contour. An axial fan 150 is accommodated in the housing 110, and it serves to convey the air at least in the axial direction. The housing 110 is configured in two parts, whereby it essentially has a division plane perpendicular to the axis X-X of the fan 150. The two housing halves that are joined to each other are, on the one hand, the motor holding part 120 and, on the other hand, the air inlet part 130. The housing 110 forms in its center a chamber 111 in which the blades 151 of the axial fan 150 are accommodated so as to rotate around the axis X-X of the axial fan 150. Moreover, the housing 110 forms a circumferential edge area 122, 132 in the vicinity of which the housing 110 has a thickness B extending in the axis direction X-X of the axial fan 150. The motor holding part 120 has a dimension R as the maximum extension in the edge area 122 in the axis direction X-X of the axial fan 150. Moreover, the chamber 111 has an extension in the axis direction X-X of the axial fan 150 at the height of the dimension L, whereas the extension of the air inlet part 130 in the axis direction X-X of the axial fan 150 has a dimension T in the area of the chamber 111. The ratio of the dimension B to the dimension R with respect to the ratio of the dimension L to the dimension T is within the range from 0.9 to 1.2. Thus, B/R=b*L/T wherein 0.9≤b≤1.2. Thanks to this geometry ratio, the noise emissions of the axial fan 150 are minimized, so that no noise emissions that have already been generated have to be damped in order to achieve a soft running noise. The fact that insulation measures can be dispensed with means that the physical size of the modular fan unit 100 can be minimized. Moreover, in comparison to known designs, material is saved and the assembly work is reduced, without this coming at the expense of a loud operating noise. The essentially square outer contour of the housing 110 makes it possible to arrange several modular fan units 100 next to each other at a maximum packing density in the form of a stack. By dispensing with insulation measures in the interior of the modular fan unit 100, the diameter D of the fan runner with respect to the outer diameter K of the housing 110 can be maximized, as a result of which the fan output with respect to the required surface area of the modular fan unit is likewise maximized. In the present embodiment, this ratio is 1.15.

(4) The diameter D.sub.K of the chamber 111 is 4% larger than the outer diameter D of the fan runner. This creates a gap between the outer diameter of the fan runner and the diameter of the chamber D.sub.K amounting to approximately 2% of the outer diameter of the fan runner, as a result of which the noise emission of the fan 150 during operation is further minimized.

(5) The motor holding part 120 as well as the air inlet part 130 have a set-back dimension E, whereby the set-back depth a, as the ratio of the set-back dimension E to the maximum axial extension C of the housing 110 in the axis direction of the X-X of the fan 150, has a value of 0.27, that is to say, a=0.27.

(6) The housing 110 has a circumferential wall ring with a square outer contour, whereby the wall ring has a circumferential hollow chamber 115. Owing to the configuration as a hollow chamber ring, on the one hand, a high mechanical stability is achieved for the modular fan unit 100 against bending and twisting, whereas on the other hand, the noise emission during operation is further minimized.

(7) The embodiment presented here is only an example of the present invention and must therefore not be construed in a limiting manner. Alternative embodiments considered by the person skilled in the art are likewise encompassed by the scope of protection of the present invention.

LIST OF REFERENCE NUMERALS

(8) 100 modular fan unit 110 housing 111 chamber 114 wall ring 115 hollow chamber 120 motor holding part 121 outflow opening 122 edge area 130 air inlet part 131 inlet opening 132 edge area 150 fan 151 blade B thickness C maximum axial extension of the housing D outer diameter of the fan runner D.sub.K diameter of the chamber E set-back dimension L chamber extension in the axis direction (X-X) of the fan R maximum extension of the motor holding part in the edge area in the axis direction (X-X) of the fan T extension of the air inlet part in the axis direction (X-X) of the fan in the area of the chamber