NL7907565A - SPIRAL CABINET FOR A VAPOR HOOD. - Google Patents

Description

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Spiral box for a vapor extractor hood.

The present invention relates to a spiral box for a darap extractor hood fitted with an air inlet ring.

Spiral cabinets for vapor extractor hoods are known in principle. For vapor extractor hoods, which can be changed from a situation in which the air is circulated by a simple action from a situation in which the air is discharged, backward curved radial wheels are preferably used. Generally, backward curved radial wheels do not require a coil housing. However, the transport capacity can be increased by arranging a spiral shape. However, a complete spiral has the drawback that only a blow-out direction is available.

The object of the invention is to design a spiral hood for a vapor extraction hood in such a way that it can be used for at least two airy directions at an optimum efficiency, thus yielding a large air yield, while also obtaining the greatest possible sound insulation.

This object is thereby achieved in that the spiral box has a special geometric shape, forms an intermediate shape between a pressurized box and a spiral and is thus characterized by a substantially rectangular housing in cross section, the lower transverse wall being placed at an angle and the rear side wall in the upper part is widened by at least one oblique wall, and that seen in front view above the abscissa axis, an edge of the front side wall merges into the annular edge via an arc, while the other edge of the front side wall in the upper part shape of a wavy line such that the wavy line at the abscissa x starts with an arc inward and via an arc to 79075 65 ν - 2 passes into the annular rim.

The embodiment provides such a combination that with as few losses as possible, for example, three blowing directions for the circulating air, respectively. the exhaust-5 obtains air without the need for complicated changes, controls or the like.

An exemplary embodiment of the invention will now be further elucidated with reference to the description and the accompanying drawings, in which: Fig. 1 is a front view; Fig. 2 is a side view.

It is of essential importance for the invention that the spiral box (the housing) can be drawn from a piece of steel material, while the air inlet ring 1 is simultaneously arranged. Manufacturing is advantageous when non-metallic materials are used, respectively. when the spiral box is made of a combination of metal and a non-metallic material.

It is of course also conceivable to manufacture the individual parts and subsequently weld them together.

As shown in Fig. 2, the transverse wall 2 can for instance be inclined at an angle of ^ 5 ° (this also depends on the design and can also be curved or have a different angle size). At the exit of the circulating air at A, the air is reversed by approximately 9 ° C. Instead of the diagonally disposed transverse wall, an extra transverse wall 2 can be provided and the house can be given a different shape at this location, although such a manufacture is disadvantageous. In the upper part, the inclined wall 3 (the conical part) can be seen (here on one side), the direction preferably being between about 30 to 5 °. This makes 2Q a trouble-free discharge of the exhaust air B with the least possible loss of energy. The exhaust air CJ can be conducted simultaneously or separately.

Also essential for the invention is the shape of the spiral box in the upper part of the abscisas x and 35 seen in front view. The arc 11 connects above the x-axis to a straight part of the edge 8 and ends in the ring 790 7 5 65 * · - ·. » 3 shaped edge 10. A pipe with a diameter d can be connected here. The radius r ^ preferably has a dimension of 1. k2 times D ^.

On the other hand, the edge 12 above the x-axis is designed as a wave line and with the inner bend 15 opens into the ring-shaped edge 10. Preferably, this wave line starts on the x-axis with a bend 1U inwards. At least one bend 16 to the outside is present therebetween, which turns into the bend 15 inwards. This wavy line 13 can also be shaped differently. It is within the essence of the invention that the radius r ^ extends up to an angle d of approximately 27 to U5 ° and then changes into a short bend 16 outwards and then again into a bend 15 inwards.

The radius r ^ should preferably be 0.9 times D ^ (D ^ is the outer diameter of the air duct), while the radius r ^ is 0.31 times D ^ and the radius r ^ 1.25 times D1 . Preferably, the wall thickness is chosen 0.085 times D ^ when using plastic.

The spiral box is placed in the vapor extraction house. Additional flanges 20 are provided for connecting corresponding pipes.

The circulating air outlet a is rectangular and will generally have a maximum size of d 1 x a. In general, no pipe is connected here, because the circulating air flows into the kitchen, for example.

The back wall J (fig. 2) may possibly be missing from a spiral box, because this wall is present in the box of the fume extractor hood. Generally, the opening C will be round and the opening A will be rectangular. The motor of the air duct is mounted on the back 7, either in the spiral box or in the box of the vapor-extractor hood.

79075 65

Claims (16)

Spiral box according to one of the preceding claims, characterized in that the inclined wall (3) forms an angle of about 20 to 1 + 5 ° with the rear side wall (¾). it. Spiral box according to any one of the preceding claims, characterized in that the bend (11) has a radius (r ^) which is between 1.25 to 1.65 times D, j, preferably at 1.12 times D ^. Spiral box according to one of the preceding claims, characterized in that the radius (r ^) merges into the rim (8) and ends in the annular rim (10). Spiral box according to any one of the preceding claims, characterized in that the bend (1 * 0 has inward radius (r ^), which is between 0.7 to 1.1 times, preferably 0.9 30 times D <|. Spiral box according to claim 6, characterized in that the radius (r ^) lies on the x-axis and flares out with the edge (12). Spiral box according to any one of the preceding claims, characterized in that the bend (15) has a radius (r ^) inwardly, which lies between 1.1 to 1 times it is preferably 1.25 times D ^. 790 75 65 Spiral box according to claim 8, characterized in that the radius (r ^) extends outwardly from the bend (16) into the annular rim (10). Spiral box according to any one of the preceding claims, characterized in that the bend (16) has an outward radius (r ^) which is between 0.2 and 0.1 * 5 times D ^, but is preferably at 0.31 times 0 ^. Spiral box according to claim 10, characterized in that the radius (r ^) lies, for example, on the 1 * 5 ° line and merges into the bends (15.1 * 0). Spiral box according to any one of the preceding claims, characterized in that it is made in one piece, for instance drawn from a piece of steel. Spiral box according to any one of the preceding claims, characterized in that the air inlet ring (1) is arranged as a whole in the wall (U) and passes into it by means of a curve (5). 1U. Spiral box according to any one of the preceding claims, characterized in that it is made of plastic, for example sprayed or cast. Spiral box according to any one of the preceding claims, characterized in that it is manufactured from a known, non-breakable and flame-resilient foam. 16. Spiral box according to one of the preceding claims, characterized in that the wall thickness when using plastic material is, for example, 0.07 to 0.1, preferably 0.005 times. Spiral box according to any one of the preceding claims, characterized in that the housing (6) has at least a cross-section widening at the location of the air outlet opening (3). Spiral box according to claim 17, characterized in that the cross-section widening is in the form of a one-sided (diverging), conical oblique wall (3). Spiral box according to one of claims 17 and 18, characterized in that the widening is designed in such a way that commercially available pipes with a diameter (d) can be used. 790 75 65 'V. 20. Spiral box substantially as described in the description and / or shown in the drawings. 790 75 65