EP1388669B1 - Fan casing and method of production thereof - Google Patents

Abstract

Ventilator housing (10) for a radial ventilator comprises radially arranged side walls (15) and an axially arranged radial housing (11) extending between the side walls to surround a rotor and opening into an outlet opening. The radial housing has edge grooves (12). A side wall is inserted into the groove so that the side wall is held on both sides by radially oriented groove wall sections (13) of the radial housing. The radial housing is fixed on the side wall by adhesive in the groove. An independent claim is also included for the production of ventilator housings for radial ventilators. Preferred Features: A continuous one-piece adhesive bead (14) is formed in the groove.

Description

The present invention relates to a fan housing for Centrifugal fans and a method for the production of such fan housings.

There are radial fans known in which the fan housing of two substantially radially aligned side walls is formed. The side walls are essentially designed circular, with an outlet to the predominantly tangential discharge of a fluid flow from one in the Inside the centrifugal fan arranged fan wheel formed is. A radial housing extends axially between the two side walls. It goes through one of the two defined the axial connecting line between the side walls Edges of the outlet opening leads, essentially tangentially aligned with the fan wheel, wraps around the fan wheel at a predetermined radial distance and leads to the other by the axial connecting line between the Side walls defined edges of the outlet opening. By the Radial housing and the side walls is enclosed the fan wheel, it is only one formed in a side wall Supply for the pumped fluid and through the both side walls and the radial housing formed outlet opening formed as a fluid outlet opening.

The radial housing has for attachment to the side walls on both sides of a radially aligned fold, each in abutment with one of the two side walls, being to attach at regular intervals joints, e.g. Welding points are provided. Furthermore it can be provided be that at least at the ends of the radial housing, the lie in the direction of the outlet opening of the radial housing, to Securing the attachment of the radial housing to the side walls a screw or rivet connection is formed.

Fan housings of this type are found, in particular, in the case of large fans Application, such as in the heating and Ventilation, especially in ventilation of industrial Plants and buildings and in air conditioning systems, in particular building air conditioners, be used. Such fans have outer diameter of the order of 10cm to 2m and more.

To produce such fan housing is a flat Fed web material, on both sides of the right angles from Web material protruding fold is formed. It is about the rolled up prefabricated prepositioned side walls, wherein the side walls around the central axis of the radial fan accordingly the feed of the web material pivoted around become. To set the joining points by spot welding is in each case a stop of about 2.5 to 4 seconds in the advance of Required sheet material, taking over the circumference of the housing on the order of 13 to 17 joint points are. A continuous feed is therefore not possible. Due to the required holding times, the required production time towards a possible continuous manufacturing process elevated. From US-A-3653116 or FR-A-2105109 are fan housings the type mentioned above, in which the Side walls of the fan housing by a continuous Joining process with a peripheral wall forming web material get connected. This joining process takes place, for example according to US-A-3653116 by forming rollers, through the first a groove on the two longitudinal sides of the web material is formed, in which inserted the side walls and be pressed in. A disadvantage of this and the above described fan housings is the lack of fluid tightness the joint lines. This can be undesirable Flow noise caused by the escape of the fluid and on the other hand moisture can penetrate, in particular at the edges of the side walls and at the edges of the Joining damaged surfaces lead to corrosion can.

Object of the present invention is a fan housing and to provide a method for its production, this is a largely continuous supply of the radial housing forming sheet material, wherein a fluid tightness should be achieved.

This object is achieved by an inventive fan housing and a method according to the invention for its production solved.

An inventive fan housing has two substantially radially aligned, spaced from each other Sidewalls on. Extends between the side walls itself a radial housing, the one inside the fan housing radially locatable rotor of the radial fan and opens into an outlet opening. According to the invention The radial housing has marginal grooves. each Side wall plunges with its outer edge in a groove, so that the side wall of radially aligned Nutwandungsabschnitten the radial housing are encompassed. The radial housing is by gluing in the area of the grooves on the side walls attached.

By gluing the radial housing to the side walls is a fluid-tight connection over the entire length of Radial housing achieved. Loss flow and possibly By noise flow resulting noise is avoided. In addition, the adhesive bond in a continuous Process, an interruption of the material feed during the manufacture of an adhesive bond not necessary. In addition, the cutting edge the side wall, which by cutting or punching the side wall made of flat material, and which has sharp edges and easily cutting, held in the groove and includes. This forms a protection against cuts on this side edge, so that any necessary post-processing the side edge can be omitted.

Another advantage of a fan housing according to the invention is to be seen in that by the gluing of side walls and radial housing the vibration bridge between the usually made of sheet metal sidewalls and the from the the same material formed radial housing is interrupted. In addition, it is possible that the natural frequency of the Fan housing by sticking in a cheaper Area is shifted. Vibrations and vibration transmission in the audible frequency range can then be reduced.

Advantageously, a continuous, continuous, integral adhesive bead formed in the groove. An advantage Such an adhesive bond is that the cavity in the Groove where water and moisture could collect filled by the adhesive bead. It will therefore be corrosion avoided in the contact area between the side wall and radial housing. Furthermore, the most susceptible to corrosion emerges Cutting edge of the side wall in the groove located in the Adhesive and is therefore protected. According to a preferred embodiment of the invention, the blank edges of the material containing the outer groove conversion sections of the radial housing, also of one Covered adhesive bead. This measure also serves to protect in front of the gap between the side wall and Nutwandungsabschnitte penetrating moisture and thus preventing Corrosion.

According to a further embodiment, it can be provided that in the end region of the radial housing, in the vicinity of the outlet opening, as well as possibly in the area of the transition of the radial housing of a linear, the tangential aligned derivative to the outlet opening forming section permanent connections between side wall and radial housing be attached. These unsolvable connections are only for the stabilization of the adhesive bond before Setting required. This allows further processing of the Fan housing without waiting for the bonding of the bond must become. This allows the fan housing without additional Waiting time to be reused. Attaching the Inseparable connections, such as rivets, can after bonding of the radial housing with the side walls, so that no interruption of the bonding process when setting the Rivets or when making the permanent connection arises. Here, a rivet in this area only interspersed the side wall in the region of Nutwandungsabschnitte, this However, areas are outside of the fan housing enclosed space in which the centrifugal fan arranged is.

An inventive method for producing a fan housing provides that two define the cross-sectional shape Side panels are radially aligned. An essentially flat web material is fed and the contour formed following the side panels and attached to the side panels. The flat sheet then forms axially extending between the side plates radial housing. According to The invention will be on the web material on both sides in each case marginal double fold formed in the middle of a Groove runs. To attach the web material to the side panels These are introduced in a groove and by gluing Connected by removing the adhesive from an adhesive dispenser is introduced into the groove before the supplied web material got into abutment with the side walls, with the side walls dive into the groove.

According to an advantageous embodiment, the supply takes place the web material from a supply roll, the web material is still flat across the entire width, while being fed to the side panels by bending the groove forming the double fold is formed. The web material becomes according to the invention during the advance of the wrap length the side walls cut accordingly. Beginning and end of the radial housing formed from the web material are thus flush with the outlet and the through the Sidewalls given edges.

It is possible during the sticking and molding of the Web material on the side walls or even afterwards one or form a plurality of insoluble compounds, in particular rivets.

Figur 1

das Schrägbild eines erfindungsgemäßen Ventilatorgehäuses;

Figur 2

ein Schnittbild durch das Ventilatorgehäuse im Bereich des Radialgehäuses entlang der Schnittlinie II-II in Figur 1;

Figur 3

die schematische Darstellung eines erfindungsgemäßen Verfahrens zur Herstellung eines Ventilatorgehäuses; und

Figuren 3a-3c

Schnitte entlang den Schnittlinien A-A, B-B bzw. C-C der Figur 3.

These and other advantageous embodiments of the invention can also be taken from the patent claims. Moreover, the invention is explained in more detail below with reference to the embodiment shown in the drawing; showing:

FIG. 1

the oblique view of a fan housing according to the invention;

FIG. 2

a sectional view through the fan housing in the region of the radial housing along the section line II-II in Figure 1;

FIG. 3

the schematic representation of a method for producing a fan housing according to the invention; and

FIGS. 3a-3c

Cuts along the section lines AA, BB and CC of Figure 3.

FIG. 1 shows an oblique view of an inventive device Fan housing 10. The fan housing has an outlet opening 17 through which the fan generated Fluid flow substantially tangential to the centrifugal fan the fan housing 10 flows. The outlet opening is on its top and bottom through the radial housing 11 and laterally bounded by the side walls 15. At the edge the outlet opening 17 mounting flanges 23 can be arranged be the connection of other fluid lines to the fan housing serve. The fan housing 10 has both sides a radially projecting marginal double fold on the radial housing 11, between which the double fold forming Nutwandungsabschnitten 13 a groove 12 is formed, in which the side wall 15 protrudes with its side edge 22 and is stuck there. The radial housing 11 is corresponding shaped the contour of the side walls 15.

An additional attachment between the radial housing 11th and the side walls 15 is given by the rivets 16. The Rivets 16 are both in the illustrated embodiment the ends of the radial housing, ie in the region of the outlet opening 17 as well as in the transition from the tangential, rectilinear Course of the radial housing 11, to the outlet opening 17th leads, in the radial fan substantially radially enclosing Arranged area. The rivets serve only the Attach the two parts to each other as long as the adhesive not tied. The adhesive bond is suitable even without additional rivets all strength requirements to suffice. Only in the unbonded state of the adhesive it requires an additional securing of the bond, if during this period further processing of the Fan housing should be done.

Figure 2 shows a partial view of a section through the Fan housing along the section line II-II of Figure 1. It is shown the area in which the side wall is on both sides from the Nutwandungsabschnitten 13, which form the double seam is encompassed. The side wall dips into the groove 12th one. In the groove bottom of the groove 12 is also adhesive 28th like on both sides of the groove. At Nutrand are each Kleberaupen 14 trained. Also the blank edge 18 of the outer Nutwandungsabschnitts 13 is covered by a bead of adhesive 14.

The side edge 22 of the side wall 15 is from the two Nutwandungsabschnitten 13 and is located in the groove 12. There she dips into the adhesive 14. By the adhesive 28 in the groove, in particular in the groove bottom, and possibly in addition, the two adhesive beads 14 on both sides of the side wall in each case a fluid-tight connection is created. This is also alone due to the bonding between the side wall 15 and the Nutwandungsabschnitten 13 of the case. Thus is the groove against deposition of dirt, moisture and water and thus protected against corrosion. This is special in the area of the side edge and also in the area of the cutting edge 18 the case.

The limited by the marginal double seam 24 radial housing extends substantially perpendicular to the side wall 15. In this case, the of the Nutwandungsabschnitten 13th the radial housing 11 embraced area of the side walls 15th one opposite the side walls 15 of conventional centrifugal fan housings 10 additionally required oversize, since the not axially extending portion of the radial housing is aligned with the radially outer side edge 22, but in contrast, set back radially inward by the groove depth is. After the inner diameter of the radial housing 11 and thus the contour shape of the side walls 15, however, by the diameter of the fan of the centrifugal fan and the fixed around the fan running around flow chamber are, the outer diameter of the sidewalls must be appropriate be adjusted.

Should be avoided that the double seam 24 as an annular Ridge protrudes outward and instead a flat outer structure be formed, so the radial housing must instead of the double seam 24 have a triple fold. The triple fold then points inside the side walls respectively a radially inwardly projecting fold on and next to this first, inwardly receding fold a double fold 24 as described above. It is then between the inwardly projecting fold and the inner first groove wall portion 13 formed an outwardly open groove. This can, if it is disturbing, but closed. An advantage of such a design is at the expense of one slightly larger axial length realized lesser Outer diameter.

A broadening of the fan housing over conventional Fan housings is given, this is on both sides only the degree of material thickness of the web material 21, which is used to manufacture the radial housing 11 is and is therefore negligible.

FIG. 3 shows a production station for producing according to the invention Radial fans shown schematically by means of a process for the preparation of inventive Shen Fan housings is explained. FIGS. 3a to 3c show sectional views through the supplied material at different processing stages of production.

In the manufacture of the fan housing 10, two Side walls 15 with respect to a central axis 19, which the Central axis of the fan housing 10 arranged in the radial fan forms, vertically aligned so that the side walls 15 substantially radially with respect to the central axis 19 are lost. From a coil roll 20 is web material 21, like sheet metal, unrolled. The web material 21 is, as in Fig. 3a shown formed flat up to the blank edge 18.

The web material 21 passes through a first bending tool 26 and a portion 31 will be on both sides of the edge of the web material Angled at 90 °. A fold is formed. The web material 21 has, as shown in Fig. 3b, a 90 ° angled portion 31 which at the blank edge 18 ends. The turn is done down from the plane of the web material 21 away.

In the further feed of the web material 21 it comes to a second bending tool 27, Here is the section 31, at his outer end with the blank edge 18 by 180 ° upwards bent. It forms the double seam 24, the two sides formed from the Nutwandungsabschnitten 13 and the groove bottom becomes. Between the Nutwandungsabschnitten 13 is after open top groove 12 is formed. This one has a width on, which corresponds to the material thickness of the side walls 15. The groove is filled by an adhesive dispenser 25 with adhesive 28, wherein the filling amount is metered. By appropriate In particular, dosing can be achieved in addition to on both sides of the side wall 15 at the groove edge a Kleberaupe 14 forms, which also cover the blank edge 18 can. FIG. 3c shows a sectional view through the trained marginal groove 12 on both sides of the supplied Web material 21.

In the further feed, the web material 21 reaches the side walls 15. There, the web material 21 corresponding to the contour the side walls 15 formed. The side walls 15 dive with its side edge 21 in the adhesive-filled groove 12 a. The adhesive bond is made. According to the feed of the web material become the sidewalls about the central axis pivoted. The web material 21 becomes the radial housing shaped. The web material is first on one At the beginning of 29, the area is in the area and preferably flush to the outlet port 17, and then around the side wall 15 to to the other end 30 on the opposite side of the outlet opening 17 led around.

When immersing the side wall 15 in the groove can excess Adhesive are displaced, which then on both sides of the side wall 15 forms a bead of adhesive 14. The supplied web material 21 is cut to length so that the radial housing 11, which is formed from the web material, flush with the outlet opening 17 ends. The fan housing is completed. It is now possible to rivet 2 or 3 places if desired for connecting side wall 15 with the radial housing 11th but this is not mandatory.

Claims (8)

1. Fan housing for a centrifugal fan, with essentially radially oriented side walls (15) arranged at a distance from one another representing the housing, and with an essentially axially oriented radial housing (11) extending between the side walls (15), substantially enclosing a rotor and terminating in an outlet, which is provided with edge grooves (12), the side wall (15) dipping into the groove (12), so that the side wall (15) is surrounded by radially oriented groove wall sections (13) of the radial housing (11), characterised in that the radial housing (11) is secured to the side walls (15) by bonding in the groove (12), and in that a continuous, single-piece adhesive bead (14) is formed to produce a fluid-tight joint between the radial housing (11) and the side wall (15).
2. Fan housing according to claim 1, characterised in that the outer radially oriented groove wall sections (13) represent the lateral edge of the radial housing (11), the adhesive bead (14) extending to the axial cut edge (18) of the radial housing (11).
3. Fan housing according to any of the preceding claims, characterised in that the grooves (12) are produced from a double fold (24) of the material of the radial housing (11), the side walls (15) preferably being oversized to match the depth of the groove.
4. Fan housing according to any of the preceding claims, characterised in that permanent joints between the radial housing (11) and the side walls (15) are produced in the area of the grooves (12) at the beginning and at the end of the radial housing (11) and preferably at an intermediate point, in particular be means of rivets (16).
5. Method for the production of fan housings for centrifugal fans, wherein two side walls (15) defining the cross-sectional shape are aligned radially, wherein an essentially flat web material (21) is fed in, wherein the web material is shaped to match the contour of the side walls (15) and secured to the side walls to form the axially oriented radial housing (11), wherein a double fold (24) with a groove (12) in the centre is produced at both edges of the web material (21), and wherein each of the side walls (15) is surrounded by the groove wall sections (13) of a groove (12), characterised in that the side walls (15) are bonded to the radial housing (11) in this area, and in that the adhesive (28) is introduced into the groove (12) from an adhesive dispenser (25) before the web material (21) comes into contact with the side walls (15), the side walls (15) dipping into the groove (12).
6. Method according to claim 5, characterised in that the flat web material (21) is fed in, in that the double folds (24) at the edges with the grooves (12) are produced during the feeding-in process by bending, and in that the material is then shaped to match the contour of the side walls (15) and cut to length.
7. Method according to claim 5 or 6, characterised in that the radial housing (11) is permanently secured to the side walls (15), in particular by means of rivets (16), in the area of the beginning (29) and the end (30) of the radial housing (11).
8. Method according to any of claims 5 to 7, characterised in that the side walls (15) perform a rotary movement about the central axis (19) of the centrifugal fan while the radial housing (11) is being attached and shaped, the circumferential speed of the side walls (15) corresponding to the feed speed of the web material.

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