IL112026A

IL112026A - Ventilation box

Info

Publication number: IL112026A
Application number: IL11202694A
Authority: IL
Original assignee: Wimbock Besitz Gmbh
Priority date: 1993-12-21
Filing date: 1994-12-19
Publication date: 1996-12-05
Also published as: EP0667496B1; DE59406209D1; IL112026A0; DE4343718A1; ATE167276T1; ES2119954T3; EP0667496A1

Abstract

The ventilation box has a housing (1) with an air output aperture and at least one ventilation tube (2) in the housing, connected to an air intake and containing a regulating flap. The air output aperture in the housing is covered by a bottom plate, consisting of a perforated plate (10) and a honeycomb insert (12). The jacket surfaces of the ventilation tube and the regulating flap are perforated. The ventilation tube is fitted with a closed bottom at the end of it inside the housing. The perforated plate is connected to the honeycomb inset on the output side. The honeycomb insert may have round or polygonal channels close against each other.

Description

Ventilation box Wimbock Besitz GmbH, C. 95892 vl/kk Wimbock Besitz GmbH Tiroler Strafie 60 D-83242 Reit im Winkel Ventilation Box Description The invention relates to a ventilation box including a housing with an air outlet opening, at least one air duct extending within the housing and connected with an air supply and in which a control flap is arranged. Further, the air outlet opening is covered by a base plate which is formed by an apertured plate and a honeycomb insert.

In the case of supply of fresh air into frequently used work spaces, the most varied ventilation problems occur depending on the different uses. In particular, in large kitchens in which a large portion of fat/steam is produced in the room air, an air supply of fresh air introduced through the ceiling by means of known air supply devices is often very ineffective. As the air in the known supply devices can only be introduced in a very turbulent state or only with very high flow velocities, the supplied fresh air is either immediately withdrawn again through adjacent deaeration devices without the contaminated room air being replaced by the fresh air, or very strong, undesirable air movement occurs in the entire work room.

An air exhaust system of the sectionalized type of each element consists of a rectangular housing with an air outlet surface forming the bottom surface and an air inlet branch opening into surfaces opposing the bottom surface or lying adjacent to this. In this air inlet branch there is arranged a throttle flap, not described in greater detail, for adjusting the desired through-flow air quantity. Beneath the air inlet branch and symmetric with this in the housing interior is a plate-like perforated air distribution plate. A further perforated plate is arranged as an air stagnation plate between the air distribution plate and an air guiding chamber and serves to homogenise the air flow across the air outlet surface of the housing. The air guiding chamber includes a honeycomb plate with evenly distributed cylindrical channels and a perforated plate placed on the inlet side of the honeycomb plate.

A laminar air flow is achieved with the known air outlet system in the case of relatively high partial air penetration speed, i.e. an appropriately large air replacement rate, but for this purpose, a subdivision into at least two successively arranged chambers as seen in the flow direction is necessary with the corresponding high work-input and cost-intensive structure.

The technical problem forming the basis for the invention is to provide a ventilation box with a simple construction in which an adjustable laminar air inflow is possible.

The solution of this technical problem consists in providing ■ a ventilation box of the type initially mentioned which is characterized in that the surface of the air duct and of the control flap is perforated, that the air duct has a closed base at its end within the housing, and that the perforated plate joins the honeycomb insert at its outlet side.

The invention is based on the concept of providing an even distribution within the housing by means of the perforated air duct with a closed base and the perforated control flap arranged within the air duct, which does not require any subdivision into different chambers for even distribution of the air. The initial direction-orientated conveyance of the air through the honeycomb insert and then the outflow of the directed air through the perforated plate, together with the particular design of the air duct, makes an excellent laminar air inflow possible in a surprising manner which, as various tests have shown, flows several meters from the ceiling to the floor in a laminar manner without turbulence. An adjustment of the inflowing air quantity according to the size of the room to be ventilated is possible by means of the control flap adjustable with a lever. Simultaneously, a pre-turbulence takes place which enhances even distribution in the housing.

Although a perforated air duct is known this air duct is used in combination wit front of this for the supply of fresh air to a particular location and, on the other hand, nozzles are provided at the perforation of the air duct which force a deflection of the air stream by approximately 90° with respect to the air duct axis .

It is particularly advantageous for forming a very even laminar flow when the honeycomb insert has a plurality of channels arranged closely side-by-side, the cross-sections of which are circular or polygonal.

A good laminar air stream is produced with a height of the honeycomb insert of 10 to 20 mm.

Advantageously, the channels of the honeycomb insert have a diameter of 3 to 8 mm, a diameter of the channels of respectively 4 mm and a height of the honeycomb insert of 13 mm having been determined through tests as being particularly advantageous.

Depending on the available space between the ventilation box and a ceiling above this, it can be of advantage to arrange the air duct vertically. However, should insufficient space for such assembly be available, then a horizontal mounting position of the air duct in the ventilation box is also possible without any problems.

If the supply of a very large quantity of fresh air is desired, it can also be advantageous to build in a vertically and a horizontally arranged air duct in one housing.

A perforation of the control flap and the shell of the air duct with the same grid patter and the same diameter of the openings has proved to be particularly advantageous in combination with the mentioned honeycomb insert and the perforated plate. In this case it is advantageous when the diameter of the openings lies in a range of 4 mm to 6 mm, a diameter of 5 mm being preferred.

On account of a smaller diameter of the honeycomb channels in comparison to the diameters of the openings of the perforated plate, a very even distribution of the air outflow stream is achieved .

An excellent laminar air flow is achieved with a diameter of the openings in the perforated plate of 2 mm.

In the following, for better understanding and further explanation, two exemplary embodiments of the invention are described and explained with reference to the enclosed drawings, in which: Fig. 1 shows a partially sectioned three-dimensional view of a ventilation box according to the invention in which the vertical as well as the horizontal arrangement of an air duct is shown for illustration, Fig. 2 shows a longitudinal section through the air duct with a control flap arranged therein, and Fig. 3 shows a partial view of one of the swivel connections of the control flap and air duct.

As can be seen in Fig. 1, the ventilation box according to the invention consists of a box-shaped housing 1 of steel sheeting which is open at the bottom. Two parallel lateral surfaces of the housing 1 are bent at a right angle in the region of the air outlet opening in order to serve as a support for a perforated plate 10 covering the air outlet opening. The perforated plate 10 has at two opposing lateral surfaces respectively having a double right-angled bend. A honeycomb insert 11 is inserted into the U-shaped bends and is formed like a bee honeycomb, i.e. it has adjacent channels 112026/2 which have a circular cross-section. The honeycomb insert 11 is held on the perforated plate 10 by means of a holding-down device 12 which is inserted between the honeycomb insert 11 and the U-shaped bends of the perforated plate 10.

The box-shaped housing 1 has a round opening at its top side into which an air duct 2 is inserted. As is especially apparent from Fig. 2, this air duct consists of a perforated cylindrical sheeting forming the shell of the air duct 2 which, at the bottom side thereof, i.e. within the interior of the housing 1, is closed by means of a base plate 21. On its side opposite this sheet base late 21 and lying outside the ventilation box, the air duct 2 has a connection piece which is itself connected to an air feed or supply source not shown here.

A further embodiment of the arrangement of the air duct 2 within the housing 1 with a horizontal air duct axis is shown in an exemplary manner at the right-hand side of the housing 1.

As shown in Fig. 2, the air duct" 2 has a control flap 22, the outer diameter of which is somewhat smaller than the diameter of the perforated cylindrical sheeting of the air duct 2 and the control flap is pivotably supported about a horizontal axis by means of two support pivots 26 in the perforated cylindrical sheeting. The control flap 22 also consists of perforated sheeting and is adjustable in terms of its position by means of a lever 23.

One of the two support pivots of the control flap 22 is shown in an enlarged view in Fig. 3. At the outer periphery of the control flap 22, there is mounted a U-shaped bracket 25 in the arms of which there are bores for insertion of the support pivot 26. The support pivot 26 sits in the bores within the bracket 25 as well as in one of the openings in the perforated cylindrical sheeting of the air duct 2. The support pivot is secured in the bracket 25 by means of a helical spring 24. The spring 24 in turn supported at one of its ends on one of the arms of the bracket 25 and engages with the other end in a groove provided in the support pivot 26. In this manner, the position of the support pivot 26 is fixed. Additionally, the control flap 22 can be removed without great effort by pushing back the support pivot 26 against the spring force of the spring 24.

The ventilation, box according to the invention is part of a ventilation ceiling, can be varied in terms of its size according to requirements and can have one or more air ducts 2. The air ducts 2 can be mounted either with a vertical axis as shown at the left in Fig. 1 or with a horizontal axis as shown to the right in Fig. 1. Different tests have shown that the effect is essentially the same and the mounting position of the air ducts 2 is therefore merely dependent on the spatial relationships. If sufficient space is available above the ventilation ceiling in which the ventilation box according to the invention is integrated, then a mounting of the air duct with a vertical axis is to be preferred.

However, if the spatial relationships above the top of the ventilation box are narrow, then a mounting of the air duct 2 with a horizontal axis is recommended.

The ventilation box according to the invention with a perforated air duct 2, a perforated control flap 22 arranged therein, a honeycomb insert 11 and a perforated plate 10 provide a very even air egress across the entire perforated plate surface. Tests have shown that this combination is so advantageous because the supply air is evenly distributed in the interior of the housing 1 by means of the perforated air duct 2 such that a constant pressure prevails throughout the interior of the housing 1. The honeycomb insert 11 itself has a directional effect. On account of the openings in the honeycomb insert 11, the air out of the interior of the housing 1 is vertically aligned and inflows in an even air veil through the perforated plate 10 into the room to be ventilated .

Claims

C L A I M S

1. Ventilation box including a housing (1) with an air outlet opening, at least one air duct (2) extending within the housing (1) and connected with an air supply and in which a control flap (22) is arranged, and a base plate covering the air outlet opening and having a perforated plate (10) and a honeycomb insert (11) , c h a r a c t e r i z e d in that the surface of the air duct (2) and of the control flap (22) is perforated, the air duct (2) has at its end within the housing (1) a closed base (21), and the perforated plate (10) joins the honeycomb insert (11) at its outlet side.

2. Ventilation box according to claim 1, characterized in that the honeycomb insert (11) has circular or polygonal channels arranged closely side-by-side.

3. Ventilation box according to claim 1 or 2, characterized in that the honeycomb insert - (11) has a height of 10 to 20 mm.

4. Ventilation box according to claim 1, 2 or 3, characterized in that the individual channels of the honeycomb insert (11) respectively have a diameter of 3 to 8 mm.

5. Ventilation box according to claim 1 or 2, characterized in that the individual channels of the honeycomb insert (11) respectively have a diameter of 4 mm and a height of 13 mm.

6. Ventilation box according to claim 1, characterized in that the air duct (2) is arranged vertically within the housing (1) .

7. Ventilation box according to claim 1, characterized in that the air duct (2) is arranged horizontally within the housing (1) .

8. Ventilation box according to claim 1, characterized in that the control flap (22) is adjustable by means of a lever (23) .

9. Ventilation box according to one or more of the claims 1 or 6 to 8, characterized in that the perforated shell of the air duct (2) and the perforated control flap (2)2^ have the same perforation.

10. Ventilation box according to claim 1 or 9, characterized in that the perforated shell of the air duct (2) and the perforated control flap (22) have evenly distributed apertures which have a diameter of 4 mm to 6 mm.

11. Ventilation box according to claim 10, characterized in that the apertures have a diameter of 5 mm.

12. Ventilation box according to claim 1, characterized in that the channels of the honeycomb insert (11) have a diameter which is smaller than the diameter of the openings in the perforated plate (10) .

13. Ventilation box according to claim 1 or 12, characterized in that the openings in the perforated plate (10) have a diameter of 2 mm to 4 mm, preferably a diameter of 2 mm.