SU1215778A1 - Arrangement for feeding parting agent - Google Patents

Description

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The invention relates to ferrous metallurgy and can be used for spraying flowable materials during the supply of process lubricants and coolants to the working surface of the rolls of wide strip hot rolling mills.

The aim of the invention is to reduce the flow rate of the spraying medium and increase the uniformity of the flow in the planned section of the jet.

Figure 1 shows the device, a general view; and figure 2 is the same, an enlarged longitudinal section.

The device contains an external collector 1, in the cavity of which the internal collector 2 is installed coaxially, each with its own drive 3 and 4. The length of the collector 2 evenly installs nozzles 5, the profile of which is made in the form of a Laval nozzle with an inlet section 6, a critical section 7 At the same time, the entrance end of the nozzle 5 is placed in the collector 1, and the critical section area 7 is connected by an inclined, through tangential hole 9 with a collar of the collector 1, which is made at an angle of 30-50 o and a nozzle in the direction of the output section 8.

Hole 9 can be performed

round or rectangular cross section.

In the cavity of the collector 2 at a distance equal to 1.2-3 critical diameter from the output end of the nozzle 5, the output end of the nozzle tO is installed, passed through the walls of the collectors 1 and 2 and connected to adjacent pipes by a common main pipe 11 regulator 12, such as a valve, choke, and the like. The area of the flow area of the pipeline 11 must exceed three times the total area of the pipes 10 and more, and it is advisable to make the diameter of the pipe equal to 0.8-1 of the diameter of the inlet end of the nozzle. The end of the porn control body 12, which is opposite to the pipeline 11, is connected, for example, by means of the intake pipeline 13 to the environment. The intake end of the pipeline 13 is advisable to install in the zone of the greatest gas (vapor) saturation.

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o 5 Q

five

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The proposed device works as follows.

A gas-like agent, such as compressed air, steam, inert gas, etc., with a pressure exceeding the fluid pressure, enters the collector 1 through the supply 3, is evenly distributed through the nozzles 5 and introduced through the tangential hole 9 in the nozzle cavity, where spinning heavily. As a result, an area of sharply reduced pressure (discharge) is created in the near-axis zone. Liquid medium, such as technological lubricant, under pressure enters the collector 2 through inlet 4, is evenly distributed along the length of the collector and enters through the inlet section 6 of the nozzle 5 into its critical section 7, where it is mixed with a rotating gas-liquid medium exits from the expanding outlet section 8 of the nozzle. In the process of mixing and high-speed jet flow, technological lubricant disperses into small fractions, interacts with adjacent streams and as a single sprayed stream enters the surface of the mill roll. When the flow is twirled in the nozzles, ambient air is sucked into the axial zone of the rarefaction, through the intake pipe 13, the valve and control body 12, the main pipe 11 and the pipes 10.

The air ejected jet is distributed over the center of the nozzle 5, whereby the pressure of the jet is averaged in the transverse and longitudinal directions of the nozzle 5, as a result of which the reverse flow zone is blown off. When this occurs, the alignment of the density of the dispersed flow over the nozzle section.

In the process of setting up the device, changing the amount of secondary air both by adjusting the valve and regulator 12 and changing the pressure differential between the liquid and the gas, achieve a stable, homogeneous, sprayed flow with a high degree of dispersion, since the additional introduction of the gaseous flow into the central part of the nozzle increases spray liquid fineness.

Placing the outlet end of the nozzle 10 at a distance from the inlet section 6 of the nozzle 5, equal to 1.2–3 of its critical diameter, creates optimal aerodynamics of the outgoing jet, ensures uniform flow of secondary air and direct input into the nozzle without peripheral turbulence zones, complete filling the lubricant flow over the cross section excludes disturbances when a secondary gas stream is introduced into the nozzle.

The approach of the output end of the nozzle 10 to the nozzle at a distance of less than 1.2 D, (p causes the appearance of circulation zones in the liquid collector 2 and clogs the device, worsens lubrication and increases the hydraulic resistance of the fluid path.

Removing the outlet end of the nozzle 10 over a distance of more than 3 Dpjp causes deformation of the additional air flow and a decrease in the flow of lubricant to the nozzle 5.

The use of the proposed device makes it possible to reduce the flow rate of the spraying medium and also to increase the degree of homogenization of the sprayed flow over the jet torch cross section.

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Compiled by M.Reutov. Editor A.Vorovich Tehred.Gergel. Corrector E.Roshko

Order 930 / 8Discount 518Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, Proektna St., 4

Claims (1)

- DEVICE FOR SUPPLYING TECHNOLOGICAL LUBRICATION mainly to the surface of the rolling rolls, containing a piping system, coaxially mounted internal manifold for supplying lubricant and an external manifold for supplying compressed air, with single Laval nozzles with channels tangentially installed in their critical sections, characterized in that, in order to reduce the flow rate of the spray medium and increase the uniformity of flow in the planned section of the jet, the ano is equipped with an additional collector for supplying air from the atmosphere with nozzles, anovlennymi coaxially Laval nozzle, wherein the exit ends of the pipes are placed in the cavity of the internal manifold at a distance from the inlet ends of the nozzles is equal to 1.23 of the critical diameters. 1 „„ 1215778 1,121