Domestic or industrial hood having a rapid attachment device for a centrifugal fan

A domestic or industrial hood having a rapid attachment device for a centrifugal fan wherein an opening (13) is foreseen in the structure (12) of the hood being externally connectable to a discharge hose and adapted to receive one end (17) of a centrifugal fan (16), and wherein the opening (13) in said hood is equipped with a flange (14) for centring and housing the upper exit end (17) of the centrifugal fan (16) and also including at least one easily removable centring and attachment element (19) from a lower portion (20) of the fan (16) on the hood structure.

The present invention relates to a domestic or industrial hood having a rapid attachment device for a centrifugal fan.

On domestic and/or industrial hoods, the centrifugal fan conducts an air flow of a certain quantity from the inside of closed environments towards the outside. This is performed through suitable evacuation ducts, that sucks the air from environments saturated with greasy vapours, variously sized oily particles microdispersed in the air, dust, humidity and various organic particles composing highly polluting and fouling mixtures directing them towards surfaces to create an impact, that then slide to deposit subsequent layers of solid particles through speed loss or adhesion.

Therefore it is very important to clean the conductive ducts regularly and frequently to maintain the original performance levels and to eliminate fire risk determined by the increased particle deposit, which is very often composed of easily inflammable greasy particles.

Therefore current domestic and industrial hoods require frequent and regular cleaning operations. In particular, this operation is especially important in Scandinavian countries, where more for systematic use rather than for compliance with regulations, regular cleaning of hood evacuation pipe is performed for example once or twice every year.

On known current domestic or industrial hoods, the structure of the actual hood has an opening on the upper part to connect fume evacuation pipe. The fan, mounted with its relative control and power supply cable is housed in the hood structure so that the upper outlet opening is aligned with the evacuation pipe. This creates certain problems in that the evacuation pipe must be attached to the fan outlet opening using screws or clamp strips.

Once the adaptation and connection operation has been completed the fan must be fixed using a certain number of screws, at least four, to attach the fan to the rear wall of the hood structure.

Therefore, the fan must be screwed to the upper part of the cover, and also screwed to the rear part. Of course such screws are not easily accessible since the hood is usually mounted in a restricted narrow space.

It is easily understandable how operations such as those described above cannot be performed by the user because of their complexity, requiring an intervention by a man skilled in the art, who has suitable tools, which means time and cost increase.

Attempts have been made to simplify this operation by separating the power supply and control cables from the fan, connecting them only after the fan has been screwed to the rear hood wall.

This second solution has certainly improved the installation conditions for the fan work position, but it does not eliminate the need for a man skilled in the art for the alignment of the evacuation pipe with the upper fan opening, as well as stable installation thereof with relative clamp strip.

Accordingly, none of the known fan assembly and/or disassembly systems on domestic or industrial hoods provides the required criteria of simplicity, repeatability, and ease for fan assembly and disassembly. This results in slow and difficult operations, and in high cost for the user because of the necessity for intervention by a man skilled in the art.

In fact, one of the most difficult problems to solve concerns the screws that are hard to access in restricted spaces and narrow cavities, where even for men skilled in the art with appropriate tools, intervention times are long and operating is difficult. Moreover, the discharge or evacuation duct positioned on the hood opening does not always allow a quick alignment with the upper opening on the fan since the hose must be connected from the opposite side compared to the upper opening on the domestic or industrial hood structure.

Accordingly, none of these systems provides the required criteria of simplicity, repeatability, and ease of disassembly and assembly of the parts constituting the well-operating suction hood. And this in order to guarantee the frequent and regular cleaning operations both by the common user and by the maintenance technician, which is typical in the above mentioned Scandinavian countries. This results in slow and difficult interventions, with high costs for the user.

The general object of the present invention is to provide an optimal solution to the aforementioned technical problems.

In particular, one of the objects of the present invention is to provide easy, rapid, repeatable and safe assembly and disassembly of the fan, preventing wear of the centrifugal fan on the hood structure, and eliminating the need for difficult and uncomfortable screwing operations.

A further object is to provide this assembly and disassembly operation that can be performed directly by the end user, whether man or woman, easily and without excessive difficulties. Moreover, it should be remembered this user usually does not have specific instruments and does not possess the technical background necessary to avoid mistakes during reassembly of exhaust hoods in a safe manner.

These objects according to the present invention are achieved with the construction of a domestic or industrial hood equipped with a rapid fixing device for the centrifugal fan as described in the appended claim1.

Further important and particular characteristics of the present invention are described in the dependant claims.

With general reference toFIG. 1, the domestic or industrial hood is illustrated schematically equipped with a rapid fixing device for a centrifugal fan according to the invention, wherein the hood is indicated with the reference numeral11.

The domestic or industrial hood presents a fume or vapour collection structure12, which is wider at the bottom, and tapered towards the top towards an upper opening13. The structure of the hood12carries at the upper opening13a centring and housing flange14of a upper outlet end15of a centrifugal fan16.

The flange14has an upper tubular extension17where a lower terminal end (not shown) of an evacuation or discharge pipe (not shown) directed towards the exterior of the environment where said hood is installed, is placed and connected. Such lower terminal end of the evacuation or discharge pipe is fixed in a standard manner using strips or the like, and its removal is not necessary, the pipe being accessible for cleaning interventions directly from the inside of the hood according to the invention. Flange14is connected and attached to structure12of the hood11directly, prior to its installation on a wall or the like.

A rear wall18of the hood structure12has also easily removable centring and fixing elements, indicated with the reference numeral19, for a lower portion20of the fan16of the hood structure12.

In fact the rear wall18carries two centring pins21and two right-angled levers22rotating on the hood structure12around pivot pins23by means of an extension knob24. On the other end of the right angle lever22a concave portion32is envisaged designed to engage with the corresponding centring pin21.

On the other hand, on the lower portion20of the fan16, at opposite ends a slot25is envisaged in a portion of edge plate26.

The supply cables27with rapid insertion connections28and the control cable29with rapid insertion connection30are envisaged for attachment on the rear wall18of the hood structure12.

From the aforementioned descriptions related to the present invention, the assembly and disassembly function of a domestic or industrial hood equipped with a rapid fixing device for a centrifugal fan according to the present invention is immediately apparent.

We will consider for example, the case wherein the fan16is to be installed on the rear wall18of the hood structure12, beginning with the situation shown in FIG.2.

In this situation, it should be remembered that the hood structure12foresees a centring flange14on the upper opening13, and that the upper tubular extension17of the flange14is connected to a lower terminal end of an evacuation or discharge pipe directed towards the outside of the environment involved. Therefore there is no need for any other type of fixing means for the evacuation pipe.

The fan16is raised, its upper outlet end15being inserted inside flange14.

Thus the two slots25in the portion of the edge plate26on fan16are hooked onto two centering pins21attached to the rear wall18so that the r4ear surface of fan16and the rear wall18of the hood structure12abut with each other.

Once this simple operation has been performed the two right-angled levers22are rotated one after the other so that they overlap the portions of the edge plates26on fan16, thus blocking them.

At this point the fan16is firmly and closely attached to the hood structure12, the only remaining operation being the insertion of the rapid connection28of the supply cable27and the rapid connection30of the control cable29in their respective seats (as shown at31inFIG. 8) foreseen on fan16.

Such an assembling operation is extremely simple and accessible for all users.

This is also the case of the disassembly operations wherein the above mentioned steps are performed in reverse order.

In fact, disassembly comprises the disconnection of the supply cable27and the control cable29, followed by the rotation of the right-angled levers22to release the portions of the edge plates26on the fan16.

Finally, the centring pins21are disengaged from the slots25by means of a slight rotation action towards the operator, followed by sliding the upper end15of the fan16from flange14in a downward direction, thus obtaining the immediate removal of the fan itself.

It is easily apparent how the user can remove the components with extreme ease, and above all without the need for any specific tools. Moreover all screws that were previously located in inaccessible positions, have been eliminated.

Therefore, the hood according to the present invention achieves the aforementioned objects.

Such a hood is particularly simple in structure and does not require complicated operations for assembly and disassembly.

The domestic or industrial hood with rapid fixing device for a centrifugal fan according to the present invention can undergo numerous modifications and variations while remaining within the scope of the present invention.

Moreover, all materials employed, as well as their size and their components can be of any type according to technical requirements.