LU85377A1 - IMPROVEMENTS TO VENTILATED ENCLOSURES FOR THE TREATMENT OF PARTS - Google Patents

Description

Improvements brought to ventilated enclosures for the treatment of rooms

The present invention relates to improvements made to ventilated enclosures for the treatment of rooms, comprising successively, from top to bottom, an air supply zone # a room treatment zone situated in the intermediate position and an air evacuation zone, the air supply zone successively comprising (following the air path), in particular DOB means for supplying fresh air, filtering means and means for diffusing 10 this .air in the enclosure ^, ... ..............

There are known ventilated enclosures of the type indicated "used for painting parts, in particular large parts such as automobile bodies, in which the circulation of air between the top and bottom parts of the enclosure is established in such a way as to satisfy only the technical requirements (enclosure under overpressure to avoid the introduction of dust, optimal drying and / or baking characteristics of the paint in particular); this results, at .height of the parts to be treated,; 20 a relatively low speed (for example of the order of 0.2 m / s) of air, a speed which is insufficient to provide acceptable working conditions for the personnel performing the treatment (in particular the painting of the parts) i en in particular, a minimum air speed of 0.4- m / its height of the parts to be treated and within a determined perimeter around them is recommended by the Egalio-nal Kaladie Insurance Funds * enclosures of the kind considered, moreover, to be ............ large energy costumers, in particular of electrical energy / '2 (a flow rate of 20,000 to 25,000 m5 / h of air heated to a temperature of. 20 to 25 ° C is common for a car body paint booth) "the invention essentially aims to improve the ventilated enclosures 5 considered so as to 'meet the new requirements concerning the minimum recommended air speed without as much as it results in an energy consumption supplement ue ”or even to improve them so as to simultaneously obtain, on the one hand, at least the.

10 recommended minimum air speed and, on the other hand, a relative reduction in the overall energy consumption of the enclosure.

For these purposes, in accordance with the invention, provision is further made, after diffusion means, for accelerating means extending over substantially the entire surface of the enclosure, with the possible exception of a relatively small area. area located above the object to be treated, and arranged in such a way as the air streams. have, in particular at the level of the room to be treated, linear speeds 20 greater than their exit speeds from the diffusion means.

Advantageously, the accelerator means are separated (depending on the direction of air circulation) from the diffusion means and there is a pressure chamber between the * 25 diffusion means and the accelerator means.

Preferably, the accelerator means comprise a panel provided with openings, the total surface of these openings being less than the surface offered for the passage of air in the filtering and diffusion means, and, in a preferred embodiment, the openings are elongated openings of substantially rectangular shape.

To ensure better ‘guiding of the air streams, on the underside of the panel, each opening is associated with a guide trough with opening narrowed at its outlet; preferably, the chute is. consisting of two flaps located facing each other and extending one towards the other.

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Thanks to the arrangements provided in accordance with the invention, it is ensured that the air renewal is as rapid and as complete as possible throughout the volume of the enclosure, which allows the working conditions of the staff to be more favorable than in previous enclosures and that the treatment of parts is carried out under the best possible conditions, while however using only a minimum air flow resulting in an energy consumption much lower than it is in the previous speakers.

The invention will be better understood on reading the following description of a preferred embodiment, given solely by way of non-limiting example; in this description, reference is made to the accompanying drawing on which the single figure is a schematic side view, in section of a ventilated enclosure arranged in accordance with the invention.

The single figure schematically represents, by way of example, a paint booth for automobile bodywork 20, without, of course, the invention being limited to this single application.

In a manner known per se, the cabin 1 comprises - three zones distributed vertically, namely: - an air supply zone 2 situated in the upper part of the cabin and which comprises a sheath 5 opening into an upper chamber 4 to bring clean air (powered for example by a fan 5) "a filter 6 constituted in any manner known to those skilled in the art, and a diffuser 7 located under the filter and arranged to channel the air ver -30 tically in 'parallel veins directed downwards, this diffuser can again be constituted in any manner known to those skilled in the art; an intermediate zone 8 comprising a trellis floor 9 on which the vehicle 10 to be painted rests, this zone 8 constituting the painting room proper in which the vehicles to be painted are introduced and L— * 4 where the personnel ensuring the painting; - Finally, a lower zone 11 comprising for example under the lattice floor 9 a bottom 12 in a funnel for collecting the liquid and / or solid residues discharged by a conduit 15, as well as a system for extracting stale air (fan 14). -

With the arrangement which has just been described, the air streams leaving the diffuser 7 (arrows 15) have a relatively low speed (for example of the order of 0.2 n / s 10 for an air flow in the order of 24,000 xa? / h in a typical case) · which is entirely satisfactory for providing suitable drying and curing of the paint on vehicle 10, but which is notably insufficient for ensuring appropriate working conditions to personnel 15 around the vehicle.

According to the invention, an accelerator 16 of the air streams located under the diffuser 7 and at a distance therefrom (for example from a few centimeters to a few tens of centimeters, 12 centimeters in a typical case) so as to constitute a overpressure chamber 17 * the accelerator 16 is constituted by a plate, or a set of juxtaposed plates, having openings 18 whose number and individual surface are such that the overall passage section offered to the air is less than 25 re k that of the diffuser 7 * This results in an increase in the speed of the air nets. 19 (at least 0.4 ra / s in the example above considered) which is in proportion to the reduction in the air flow area *

LeB openings 18 may be very elongated rectan-30 circular openings> parallel to each other, and guide flaps, forming a chute 20 defining a narrowed passage, may further be arranged along the edges of the openings 18, at the . underside of the accelerator 16 *. In the typical example considered, these strand B

'u- «5 can extend over a height of about 50 mm. However, openings with other shapes (oval for example) could also be used.

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To take into account the fact that the same paint booth must be used to treat vehicles of very different sizes,. provides that the accelerator 16 extends over the entire surface of the enclosure, as shown in the single figure, so that all the pigments in suspension are removed within the shortest 1Ό 'time.

Possibly, if it turns out for example that too much air arriving at high speed on the vehicle to be painted disturbs the drying and curing process of the paint, provision may be made for a short 1.5 discontinuity of the accelerator above the central area of the vehicle to be painted; this area, designated by the reference numeral 21, is delimited in the figure by two dashed lines. In a practical way, it corresponds to a spacing step of the openings 18, or at most 20 to two spacing steps. *

In the example shown, the openings 18 extend transversely; one could however provide longitudinal openings-extending over the entire length of the cabin; optionally it is possible to provide a combination of transverse and longitudinal openings for example to promote the renewal of air in certain areas of the cabin.

As goes without saying and as already follows from the above, the invention is in no way limited to those of its modes of application and embodiments which have been more especially envisaged; on the contrary, it embraces all its variants. .

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Claims (7)

1. Ventilated chamber for the treatment of parts (10), successively comprising, from top to bottom, an air supply zone (2), a zone (8) for treating the 5 parts located in the intermediate position and a zone ( li) of air evacuation, the air supply zone successively comprising (following the air path) in particular means (3, 5) for supplying fresh air, filtering means (6 ) and of the diffusion means (7) of this 1D air in the enclosure, characterized in that it is provided · further, after the diffusion means (7), accelerator means (16), extending over substantially the entire area of the enclosure, with the possible exception of a relatively small area located above the object to be treated, and arranged in such a way that the air streams (19) have , in particular at the level of the part to be treated, linear speeds greater than their exit speeds from the diffusion means. 2. Enclosure ventilated according to reven.dicn.tion 1, charac-20 tériée-en leB means accelerators (16) are separated (according to the direction of air circulation) of the diffusion means (7) and in this an overpressure chamber (17) is provided between the diffusion means and the accelerator means. 25 3 - ventilated enclosure according to claim 1 or 2, characterized in that the accelerator means comprise a panel provided with openings (18), the total surface of these openings being less than the surface offered by the passage of air in the filtering and diffusion means, - 3q 4 - ventilated enclosure according to claim 3, charac terized in that the openings are elongated openings of substantially rectangular shape, 5. ventilated enclosure according to claim 5 or 4, characterized in that, on the underside of the panel, 35. each opening is associated with a guide chute (20) with a narrowed opening at its outlet. 7 Λ 6, ventilated enclosure according to claims 4 and 5 'characterized in that the chute Î20} is constituted by two flaps located opposite each other and extending one in "direction of the other. 7. ventilated enclosure according to any one of claims 4 to 6, characterized in that the elongated openings extend in different directions in different locations of the enclosure. B. Ventilated enclosure according to any one of. Claims 1 to 7, characterized in that it is arranged for the painting of parts, in particular of. j car bodies. AT "