JPS6087915A - Device for forming stratiform water curtain for cooling sheet metal and band - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Transversely to the direction of movement of the quarter box and the refrigerant and over the entire length of the refrigerant it consists of an elongated hill slot nozzle, with side walls of said nozzle defining a nozzle gap. To provide a water curtain forming device for cooling thin plates and bands moving through a quarter curtain, the structure of which guides cooling water flowing out in a laminar flow when there are no obstructions.

BACKGROUND OF THE INVENTION It is known that an optimum cooling effect can only be achieved if the water impinges on the cooling object in the form of a layered quarter curtain.

A number of proposals have been made in the past for forming such layered quarter curtains. According to DE 128 04 982, a nozzle having a cross section 10 which is significantly larger than the outlet and furthermore has a large number of adjacent convergent tubes in order to increase concentration. A rectangular slot nozzle has been proposed that includes a sheave-like device inserted into the nozzle.

Another unpublished proposal is that the nozzle inlet is formed smaller than the nozzle outlet and there is a downward cross-sectional expansion within the nozzle, which increases the pressure. is assumed to be obtained.

This starts from a nozzle with a rectangular cross section and planar side walls 41 .

In the case of the first-mentioned decision, a water curtain cannot be formed without great expense;
Although in this case it is also not always possible to construct the curtain in layers, the solution according to the second proposal poses difficulties, especially if very wide cooling objects have to be cooled. That is, in this case, depending on the width of the curtain (curtain length multiplied by falling height) and a certain critical falling height, (Einschnurung)
) has been shown to occur. (In the area of the fins the curtain has a smaller cross-section, so due to the oscillations present there there is a possibility of the curtain tearing.

Starting from the above considerations, the invention set out the problem of eliminating the fins (which arise in the case of wide curtain widths and high fall heights) and thereby retaining the layered water curtain.

This problem is solved according to the invention in that the side walls of the slot nozzle are curved in a convex manner transversely to the flow direction of the cooling water in the region of the outlet. of the quarter curtain (compensate the fins,
This forms a curtain that is approximately rectangular in horizontal section. In this way, not only the critical fall height can be increased, but also the water volume can be reduced without causing turbulence phenomena in the curtain. Good heat removal is achieved.

According to another feature of the invention, it is proposed that the side walls of the slot nozzle are planar in the region of the inlet and widen downwards with a continuous convex curvature. A slot nozzle formed in this way provides an advantageous flow within the nozzle gap due to the continuous shape change of the sidewalls, while at the same time preventing the curvature of the quarter curtain outside the nozzle.

According to another proposal of the invention, it is also possible to envisage that the side walls of the slot nozzle are convexly curved with different strengths in the inlet and outlet regions (1°q). If used, problems ii and J can be solved and a uniform layered curtain can be formed.

Example The invention will now be explained with reference to drawings by way of example.

In FIG. 1, a water box to which cooling water is supplied through a supply port 2 is indicated by 1.

The water box 1 is only half shown in the drawing in order to be able to better depict the nozzle according to the invention. This nozzle is collectively designated 3. The nozzle gap 4 is separated by side walls 5 and 6 and The inlet marked 9 of the nozzle 3 has a rectangular cross-section, but this cross-section is continuous towards the outlet 10 such that the horizontal cross-section of the outlet 10 curves convexly. is expanding.

In FIG. 2, the inlet indicated by 11 also has a convexly curved cross section. The outlet 12 is more curved than the inlet 11. Between the inlet 11 and the outlet 12, the entire horizontal cross section curves in a convex manner, increasing toward the outlet.

[Brief explanation of drawings]

1 is a schematic perspective view of a quarter box and a nozzle according to the invention, and FIG. 2 is a perspective view of a nozzle of another shape. 1...Water box, 3...Nozzle, 4...
Nozzle gap, 5, 6...11111 wall, 9.11...
・Entrance, 10.12...Exit

Claims (1)

[Claims] 1. Consists of a quarter box and a slotted nozzle extending transversely to the direction of movement of the cooling object and over the entire width of the cooling object, the side walls of the nozzle limiting the nozzle gap and preventing obstruction. In a quarter curtain forming device for cooling thin plates and bands that move through a water curtain and have a structure that guides cooling water flowing out in a laminar flow when there is no object, the side wall of a slot nozzle (
5, 6) is curved convexly in a direction transverse to the flow direction of the cooling water at least in the range of the outlet (10). 2. The side walls (5, 6) of the slot nozzle are connected to the inlet (9, 1)
2. The device according to claim 1, which is planar in the region 1) and expands downwardly by a continuous convex curvature. 6. The side wall' (5, 6) of the slot nozzle is the inlet (9,
11) and the outlet (10, 12) are convexly curved with different dimensions.