Fluid sprinkling – spraying – and diffusing – Combining of separately supplied fluids – At or beyond outlet
Patent
1993-09-24
1995-06-27
Merritt, Karen B.
Fluid sprinkling, spraying, and diffusing
Combining of separately supplied fluids
At or beyond outlet
239424, 239452, 239597, B05B 708, B05B 710, B05B 104
Patent
active
054273170
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a slotted nozzle for dispensing liquids, comprising and letting liquid exit between them, a gas outlet slot which is connected to a pressurized gas supply duct likewise formed in the support body.
A slotted nozzle of this kind serving as a linear spray device to cool sheet metal leaving a hot rolling mill, for instance, is known from document WO 89 10 203 A. With this known slotted nozzle the nozzle bodies are spaced from one another so that they present an open outlet gap.
Document DE 24 19 81 A likewise discloses a linear spray device. This device comprises a hollow body which is disposed inside a housing and around which compressed air flows while the hollow body itself is fed with liquid, e.g. paint. Compressed air and liquid pass through a perforated plate before they issue together from a multi-jet nozzle. The latter is embodied by a middle plate abutted at either side by a plate provided with passages. A liquid outlet is not provided between the outlet faces formed by the plates since the liquid introduced into the device is intended to be atomized before reaching the perforated plate. The mixture of substances issuing between the plates consequently is not a liquid but a mist. Neither of the two plates which might be referred to as nozzle elements defines a gas outlet slot together with a nozzle slat. Therefore, a possibility for (renewed) vaporization of condensed liquid does not exist.
Another slotted nozzle is known from document EP 0 041 729 A, one of its nozzle elements is a stiff plate which is screw connected to the support body, likewise embodied by a plate, and covers a groove formed in the support body and serving as supply duct. The second nozzle element is formed by a flexible slat which is clamped in another groove in the supply body and formed in the area in which it abuts against the stiff nozzle element with a plurality of grooves cut out and lands left in between.
The lands preferably are much narrower than the grooves and their cross section in longitudinal direction of the support body is longer than transversely thereof. The conditions of flow out of the nozzle are to be influenced in response to the properties of the medium to be discharged from the slotted nozzle by different dimensioning of the lands and grooves. The lands and grooves may be disposed transversely or obliquely with respect to the longitudinal direction of the slotted nozzle and may terminate before the actual nozzle outlet cross section so that the partial flows of the issuing medium which were separated by the lands can combine to form a uniform film downstream of the lands. In this manner it is intended to obtain a continuous veil of gas or liquid. Yet experience has shown that this is achieved only with liquids having low surface tension so that the partial streams flowing through the individual grooves have a strong tendency to unite once they left the lands.
It is the object of the invention to improve a slotted nozzle for dispensing liquids such that it will be useful for producing a uniform spray curtain made up of a liquid and a gas.
Starting from a slotted nozzle of the kind defined initially, this object is met, according to the invention, in that the nozzle elements have abutting outlet faces and the outlet face of at least one of the nozzle elements is roughened so s to have a depth of roughness of from 0.015 to 0.250 mm., whereby the exit of liquid is made possible between the abutting outlet faces.
The roughened outlet face can be combined with a totally smooth outlet face. This pairing of rough and smooth outlet faces and a gas outlet slot is especially well suited for dispersing homogeneous solutions.
The nozzle elements preferably are held in mutual abutment by elastic bias. That makes it possible to clean the outlet slot from time to time with a liquid which is pressed through at higher pressure, urging the nozzle elements apart. The bias can be generated, for example, by means of elastic guide plates connecting one each of the nozzle elements to the support body.
The
REFERENCES:
patent: 3750955 (1973-08-01), Nakai et al.
patent: 5012980 (1991-05-01), Viannay et al.
patent: 5118041 (1992-06-01), Chastang et al.
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