CA1285852C - Liquid flow control device in a pipe, namely of a coolant - Google Patents

Abstract

Installation for cooling a long steel product after it has passed through a rolling mill. This installation comprises a tube in which the product flows, the tube comprising a coolant inlet chamber at one of its ends, and a coolant outlet at the other end for the circulation of the coolant in a longitudinal direction at through the tube and around the steel product. The installation also provides a device for supplying the inlet chamber with cooling liquid comprising a main pipe, the outlet of which is connected to the inlet chamber. The main pipe can control the flow of cooling liquid through itself, which is constituted by a bypass composed of a set of discharge pipes, calibrated, mounted in parallel. Each of the discharge lines is provided with an all-or-nothing valve, and all of the valves are actuated by a common control. In this way, an ultra-fast adjustment of the flow rate is obtained which does not come at the expense of precision.

Description

~ L213 ~ 8 ~
. .
DEVICE FOR ADJUSTING THE FLOW OF A LIQUID INTO
CONDUCT, ESPECIALLY A COOLING LIQUID.
The invention relates to the adjustment of the flow rate in a pipe.
te of a liquid, especially a coolant.
We know that, for example in cooling installations weaving of steel wires or bars in a circulating water sheath tion, (USP 4 308 881 and USA 4 312 0 ~ 4) successful treatment, which leads to obtaining the qualities required for the product final, is conditioned by the rigorous control of the parameters cooling.
In the installations known to date, it is generally regulated the flow in the main line by a motorized valve whose continuously adjustable opening degree defines the cross-section fluid passage. When the parameters are stable or evolve slowly, this setting mode is satisfactory. But when it is necessary to suddenly change the cooling conditions surely there is a more or less long transient regime depending on the response time of the motorized valve, and final accuracy often defective on the flow obtained.
The object of the invention is to propose a system which overcomes the aforementioned drawbacks and offers ultra-fast adjustment flow that does not come at the expense of precision.
According to the invention, the device for adjusting the flow rate comprises, as a branch on said main pipe, an assembly calibrated pipes mounted in parallel, each pipe calibrated brée being provided with an all or nothing valve, and it is provided means for controlling said valves.
Thus, thanks to the calibration of the pipes, calibration that current technology provides excellent preci ~
the flow rate is set extremely precisely, in increments depending on the calibrated sections chosen. The calibrated pipes, which may be the same or different, lend themselves to all number and section combinations, which are necessary to obtain flow values in the main pipe useful for treatment.
The use of all-or-nothing valves allows almost zero response time.
,, 5 ~
:
The control means are preferably a computer microprocessor type which controls the shutter of the valves in function of a de ~ it value displayed by the operator or calculated automatically from the processing parameters.
~ advantageously, the calibrated pipes are condui-discharge test, the liquid subtracted from the main co-product can be recycled.
Advantageously, the calibrated pipes are taken on a collective discharge pipe stuck on the pipe main. ~ n such a device has been found to be particularly satisfactory.
making use, not inducing into the main line no significant hydraulic disturbance.
The invention will be better understood thanks to the ~ ription which will follow from a particular embodiment given as non-limiting example.
- Reference will be made to the attached single figure which schematically represents the device of the invention.
We see the main line 1 intended, in this exemplary embodiment, to supply cooling water, via an annular split distribution chamber 2 laire, a conduit 9, in the axis of which runs a steel bar 10 to be cooled, surrounded by an envelope of water (not shown) circulating in the same direction ~ - according to figure - or in Ull opposite direction.
In accordance with the invention, the pipe was stung main 1 a collective discharge line 3 on which are derived in parallel from calibrated pipes 4 fitted each of an "all or nothing" S solenoid valve.
4 calibrated pipes can be grouped in a collector return 6 which recycles the water in the main line circuit cipal 1.
The valves 5 are controlled by a microprocessor 7, which can also control a general stop valve 8 placed on pipe 1 upstream of the pipe tapping point collective 3 in the direction of cooling water circulation The system can operate simply in the way following: the supply line 1 is dimensioned fa ~ on ~ Z85t ~ $ ~
that, for a given inlet pressure of water (generally from 7 to 10 bars) ensuring sufficient speed for the envelope of water in the cooling duct 9, we obtain in this last a maximum flow. Under these conditions, the solenoid valves are therefore normally closed. Processor 7 then commands opening one or more valves to reduce desired quantity, the water flow rate in line 9.
Alternatively, one can plan to leave normally the valves 5 in the "open" position and in this case control their closing when increasing the cooling water flow sement.
~ ien heard, between these two variants, all options of intermediate operations are perfectly conceivable.
Furthermore, the choice between one or the other of these two variants can be done depending on the type of valves available (valves "closed" at rest or "open" at rest), knowing that depending on the type, it is the closing operation or the opening operation respectively which is slightly faster.
It goes without saying that the invention is not limited to cooling or cooling of deflated metal products in a water sheath, but extends its field of application wherever you want to be able to change quickly and specifies the flow rate of incompressible fluids ~ such as liquids.

Claims (4)

The embodiments of the invention about which an exclusive right of property or privilege is claimed, are defined as follows: 1. Cooling installation of a long steel product after passing through a rolling mill, comprising:
a) a tube in which the said circulates product, said tube having an inlet chamber coolant at one end, and one coolant outlet to the other end for the circulation of the coolant saying in a longitudinal direction across said tube and around said steel product, b) a supply device for said coolant inlet chamber comprising a main line whose outlet is connected to the entrance room, installation characterized in that the main line is provided with means of coolant flow control at through itself, constituted by a derivation composed of a set of discharge lines calibrated, mounted in parallel, each of said discharge lines being provided with a valve all or nothing, all of said valves being actuated by common control means. 2. Installation according to claim 1, characterized in that the discharge lines have substantially equal diameters. 3. Installation according to claim 1, characterized in that some of the pipes have different diameters. 4. Installation according to claim 1, in that said discharge lines are taken on a collective discharge line tapped on the main line.