FI72800C - Ventilation. - Google Patents

Description

1 72800

Air-conditioning pipe. - Ventilation system.

The invention relates to an air conditioning pipe with blowing holes for conducting supply air from a pipe to a space to be ventilated, the pipe being formed as a supply air diffuser by making a large number of small holes in the pipe wall. through the connection to the interior of the pipe.

A conventional air conditioning pipe can be formed as a supply air diffuser by making holes of suitably selected size and arrangement directly in the wall material of the pipe.

The velocity and direction of the air flowing inside the pipe also causes a certain axial component in the air jets discharged outside the pipe, whereby the air mass surrounding the pipe starts to flow in the direction of the pipe, e.g. colliding with the opposite wall through which the pipe is passed. The radial flow component is dependent on the static pressure inside the tube so that as the static pressure increases, the radial component increases. The axial flow component transferred to the outside of the pipe through the outflow hole depends on both the flow rate inside the pipe and the diameter of the hole in relation to the material thickness of the wall. The combined effect of these factors results in a flow outside the tube with a smaller or larger axial component.

It is a general object of the invention to provide an air conditioning pipe in which the axial flow component is partially or completely compensated.

Such an air conditioning pipe is known from GB patent 1,217,597, which discloses a specially constructed air conditioning pipe, the pressure relief space of which with its blow nozzle is formed as a structurally integral part of a complex air conditioning pipe structure. The blow properties of an air conditioning pipe are determined already at the manufacturing stage, so each pipe is only suitable for use for a predetermined and calculated application.

The object of the invention is to provide an air conditioning pipe of the said type, which is simpler in construction and more economically advantageous in terms of manufacturing, and which enables flexible design of air conditioning according to the current need.

This object is achieved according to the invention in that the plastic strip to be inserted into the opening of the pipe wall from outside the pipe includes a cavity acting as a pressure relief space, which opens outside the pipe through nozzle openings provided with flow-guiding walls.

The pipe according to the invention can be manufactured in a conventional manner and the pipe can be provided with elongated holes either during manufacture or afterwards. The choice of plastic material allows not only this retrofitting with a simple form-fitting, but also the fitting of the nozzle openings with perforated membranes.

In the following, the invention is illustrated with reference to the accompanying drawing, which shows in partial axial section the wall of an air conditioning pipe according to the invention.

An opening is made in the wall of the air conditioning pipe, e.g. a threaded air conditioning pipe. Attached to this wall opening of the pipe 1 is a separate plastic strip 5 which contains a cavity space 7 acting as a pressure relief space, which communicates through the flow restricting slot or openings 6 in the interior of the pipe and opens outside the pipe through nozzle openings 8. The nozzle openings 8 can be provided with pierceable membranes, whereby the desired, 3,700,800 varying number of nozzle openings 8 can be opened.

The depressurization mode 7 eliminates the effect of the velocity component of the internal flow in the pipe in the outflow direction. The pressure drop between the pipe and the outside air is generated in two stages, whereby the pressure drop between the pipe and the outside air is made larger while the uniformity and sound technical properties of the flow distribution are improved.

The invention can be used not only in connection with threaded pipes, but also in connection with air conditioning ducts of all types and shapes.

Claims (2)

72800 An air conditioning pipe having blow holes (8) for conducting supply air from a pipe (1) to a space to be ventilated, the pipe (1) being formed as a supply air diffuser by making a large number of small holes (8) in the wall of the pipe (1), the holes (8) and there is a pressure relief space (7) between the interior of the pipe, which communicates with the interior of the pipe (1) via a flow-limiting gap or openings (6), characterized in that a plastic strip (5) inserted into the pipe wall opening opens to the outside of the tube through nozzle openings (8) provided with flow-guiding walls. Air conditioning pipe according to Claim 1, characterized in that the nozzle openings (8) are blocked by perforated membranes.