CS215380B1 - Nozzle with infinitely adjustable current incidence angle on sheet material - Google Patents

Abstract

The invention relates to nozzles with a continuously adjustable angle of incidence on the material, located in dryers and similar technological equipment. The nozzles solve the optimal setting of aerodynamic conditions on the processed material. The essence of the proposed solution is a nozzle body terminated with guide pins mounted in bearings. Furthermore, the nozzle body is connected to the nozzle chamber by flexible sleeves. The attachment of flexible sleeves allows the nozzle body to be rotated in the range of 0 to 180° and air access in the entire range of rotation. The invention is shown in Fig. 2.

Description

The present invention relates to nozzles with a continuously adjustable angle of incidence of flow on a sheet material placed in driers and similar technological devices.

For drying and other technological heat treatment of materials of an area character, an impact flow is used, i.e., the free stream discharge from the nozzle systems (slot or circular). The free flow of air after discharge from the nozzle falls on the surface of the sheet material, where intense heat and mass transfer occurs. At the same time, the free flow in the impact area has a force effect in the form of increased aerodynamic pressure. If the flow of air masses perpendicular to the surface of the material to be processed perpendicularly, the heat and mass transfer between the material and air mass is highest, the aerodynamic pressure also reaches the highest values. The maximum values of these free-flow effects are at the point where the nozzle axis passes through the surface of the material to be processed.

These extreme values of effect may, in some technological operations, adversely affect the quality of the treatment or material being processed. Local effects are reduced by using a slotted nozzle system instead of a circular nozzle system, where the maximum effect values lie at the intersection of the axis plane of the nozzle with the material surface.

In the case of stricter requirements for uniformity of all effects (heat and mass transfer, aerodynamic pressure) on the surface of the sheet material, oblique slotted or oblique circular nozzles are used, which increase the angle of incidence of free current on the plate. They cause not only a more uniform course of all the effects of free currents, but also an additional tension in the material to be processed, which is caused by the flow of air along its surface. At the same time, the aerodynamic conditions above and below the material being processed can be varied in this way. The induction of additional thrust in the material being processed and the change of aerodynamic conditions above and below the material becomes important in the so-called gentle drying and floating drying.

At present, driers and similar technological equipment are equipped with these nozzle systems with fixed shape and position of nozzles. The technological conditions are regulated either by throttling the drying medium in the circulation circuit or by using an electric motor with speed control. The current design of nozzle systems does not allow optimal use of driers and similar technological equipment according to the properties of the material being processed, especially during the introduction of drying in the hover.

Claims (3)

Nozzle with infinitely adjustable angle of incidence on the sheet material, characterized in that the nozzle body (1) terminates with guide pins (4), The above-mentioned drawbacks are overcome by the nozzle according to the invention, which is based on the fact that the nozzle body terminated by guide pins mounted in bearings is connected to flexible flexible cuffs with a nozzle chamber. The designed nozzle enables continuous adjustment of the angle of incidence of the drying medium stream on the surface of the treated material without changing the nozzle dimensions and thus optimal adjustment of aerodynamic conditions under and above the processed material. By assembling the nozzles in the nozzle system, it is possible to optimally adjust the effect of the drying environment on the material to be processed (i.e. heat transfer and mass transfer, aerodynamic pressure, material tension). This results in higher versatility of drying ovens or similar technological equipment. The nozzle according to the invention is shown in the drawings. Fig. 1 shows a nozzle in a nozzle body assembly with a nozzle chamber; 2 shows in cross-section the principle and function of the proposed nozzle. In FIG. Figures 3 to 6 show schematically examples of assembling nozzles into nozzle assemblies and their adjustment possibilities. The nozzle body 1 is terminated at both ends by guide pins 4 (Fig. 1) which are housed in bearings 6 attached to the nozzle chamber 3. Two flexible flexible cuffs 2 are attached to the nozzle body 1, which are terminated by bars 7. Bars 7 the flexible flexible cuffs 2 are attached to the nozzle chamber 3. The ends of the guide pins 4 are adapted to be connected to a servomeehanic drive and allow for the individual adjustment of each nozzle body 1, if desired. ° and air access to it throughout its entire range of shooting. The lateral surface of the bearings β corresponds to the requirement of sealing the positive space by means of the end faces of the flexible flexible collars 2. The nozzle assembly with a continuously adjustable flow incidence angle on the sheet material 5 (FIGS. 3 to 6) enables the nozzle bodies 1 to be adjusted in the individual nozzle chambers 3 or uniformly throughout the dryer or similar technological equipment in terms of technological and energy benefits. It is also possible to adjust each nozzle body 1 individually so as to achieve the desired free-flow effects (heat transfer and mass transfer, aerodynamic pressure, additional thrust in the material) on the sheet material 5. OF THE INVENTION mounted in bearings (6) is connected by flexible flexible collars (2) to the nozzle chamber (3).