FI70320C - LUFTFOERDELARE - Google Patents

Description

AIR DISTRIBUTOR - LUFTFÖRDELARE

70320 The present invention relates to an air diffuser for connection to a ventilation duct and to act as a pressure relief device with a perforated inlet pipe surrounded by an air distribution chamber with air openings leading to a ventilated space.

The air supply to the room should be as even as possible in order to avoid draft, even when the supply air is mechanically cooled and the supply air device must be installed due to the height of the room or the structure of the ceiling. free of at least 300 mm from a uniform ceiling surface and in which case the "coanda" effect does not work in the case of blowing. The "Coanda" effect means that the incoming airflow is evenly distributed on the ceiling surface.

In addition, today's energy control requirement is that the amount of supply air should not exceed what the heat load in the room requires at any given time. As a result, the injection speeds in the supply air device are very low.

To solve the above-mentioned problems, an air diffuser has been invented which does not need a bearing surface of the false ceiling and in which the injection speeds can be very low. The air diffusers according to the invention are characterized in that the perforated inlet pipe is extended through the maniac chamber so that the holes in the circumference of the pipe point to the sides and that the end of the pipe is closed, for example by pressure measuring chambers known per se. By means of the invention, the air flow discharged from the holes of the pipe can be made to act as a carrier jet for the air flow discharged from the maniac chamber of the supply air device i 1 at a low speed.

A preferred embodiment of the invention is characterized in that the number or area of holes leading to the air distribution chamber is about twice as large as the number or area of holes outside the air distribution chamber. Experiments have shown that such a solution 2 70320 provides both a suitable air flow from the distribution chamber and a sufficiently high flow rate for the carrier jet.

Another embodiment of the invention is characterized in that the number and size of the air openings in the air distribution chamber are arranged such that the air outflow velocity is about half, outside, the velocity of the air flowing out of the pipe holes. Thus, both a suitable amount of supply air and a carrier shower are obtained.

The invention will now be described, by way of example, with reference to the accompanying drawing, which shows an air diffuser in partial section.

The air diffuser is intended to be connected to the ventilation duct 1 and to act as a pressure relief device with a perforated inlet pipe 2 surrounded by an air distribution chamber 3 with air openings leading to the ventilated space 4. The perforated inlet pipe 2 is extended through the air distribution chamber 3 the holes 5 point to the sides. The end of the pipe 2 is closed by pressure measuring chambers 6, 7 known per se, with which the pressures prevailing inside and outside the pipe 2 are constantly kept under measurement. The number or area of the holes 8 leading to the air distribution chamber 3 is twice the number or area of the holes 5 outside the manure chamber. The number and size of the air openings 4 in the air distribution chamber 3 are arranged such that the air outflow velocity v 1 is about half the velocity v 1 of the air flowing out of the holes 5 outside the pipe.

It will be apparent to those skilled in the art that the invention is not limited to the example set forth above, but may vary within the scope of the claims set forth below. Thus, the shape, number of holes and the shape of the air distribution chamber do not necessarily have to be in accordance with the example.

Claims (3)

An air diffuser for connection to an air exchange duct (1) and acting as a pressure relief device with a perforated inlet pipe (2) surrounded by an air distribution chamber (3) with air openings (3) leading to a ventilated space, characterized by that the perforated inlet pipe (2) is extended through the air distribution chamber so that the holes (5) in the circumference of the pipe point to the sides and that the end of the pipe (2) is closed, for example by pressure measuring chambers 11a known per se. Air diffuser according to Claim 1, characterized in that the number or area of the holes (8) leading to the air distribution chamber (3) is approximately twice as large as the number or area of the holes outside the air distribution chamber. Air diffuser according to Claim 1 or 2, characterized in that the number and size of the air openings in the manifold chamber (3) are arranged such that the air outflow velocity (v ^) is about half the velocity (v ^) of the air flowing out ^) ·