CN1243031A

CN1243031A - Rotor for treating liquid

Info

Publication number: CN1243031A
Application number: CN 99108993
Authority: CN
Inventors: 卡尔·韦纳斯
Original assignee: Norsk Hydro ASA
Current assignee: Norsk Hydro ASA
Priority date: 1998-07-08
Filing date: 1999-07-08
Publication date: 2000-02-02

Abstract

A rotor, used for treating a liquid such as a melted metal by adding a gas and/or grains, comprises a hollow rotating object which has some hatches at its bottom and sides. Said rotor body is connected to a shaft and is driven by a driving mechanism through the shaft, and said rotating object can enter into or depart from a liquid. Said hollow rotating object is equipped with at least one spacing wall or at least one rotary type symmetrical hollow object at its cavum to form one or a plurality of annular gaps and a central cavum; and the gas and/or grains are fed to the annular gaps and the central cavum through each channel and/or hole.

Description

The rotor that is used for treatment liq

The present invention relates to a kind of rotor, be used for handling a kind of liquid such as molten metal by adding gas and/or particulate matter, this rotor comprises a hollow rotator, this hollow rotator has some openings on its bottom and side, hollow rotator is installed on the axle, and drive with a drive unit by this axle, and this hollow rotator leaves liquid when being designed to rise and enter liquid when putting down.

Various equipment and the methods that are used for handling a kind of liquid and particulate matter are added to aforesaid liquid had been known in the past.The Norwegian Patent NO.155 of applicant, 447 have just described a kind of rotor, be used for treatment liq and material is joined this liquid, wherein, this rotor comprises a rotary symmetrical hollow body, and material joins in the liquid by a boring in the rotor spindle, and discharges through each hole in the hollow body side with this liquid, utilize centripetal force that the opening of material through the bottom sucked, and in this hollow body, circulate.

This rotor produces very high liquid treatment amount, that is the gas that mixes or particulate matter have only very little stirring or disturbance in liquid.

To being used for liquid treatment, in particular for the various rotors that various molten metals are handled, a total requirement is that mixing of gas or particulate matter is efficiently.Yet, also wish to avoid producing a large amount of stirrings or disturbance, these stirrings or disturbance cause surface and some vortexs that produce a stirring in liquid, and therefore cause and increased the gas that mixes in the surrounding environment (atmosphere).

The present invention proposes the technical scheme that some rotors of usefulness carry out liquid treatment, in this scheme, the efficient that gas or particulate matter are incorporated in a kind of liquid almost doubles, but compares with the technical scheme described in the Norwegian Patent of applicant, and agitaion does not change.In addition, the present invention proposes a kind of technical scheme of some rotors of usefulness, and in this scheme, the requirement of gas/particle thing (consumption) reduces a greater part of.The present invention is characterized in that: hollow rotator is equipped at least one spaced walls or at least one rotary symmetrical hollow body in its cavity, so that form one or more annular spaces, and each passage and/or hole in corresponding one or more spaced walls of process and/or the hollow body are supplied with gas and/or liquid in this annular space and the central cavity.

Dependent claims 2-3 defines preferred embodiments more of the present invention.

To utilize some examples below and further describe the present invention with reference to accompanying drawing, wherein:

Fig. 1 illustrates a kind of known rotor, and as the Norwegian Patent N0.155 of applicant, 447 is described, a) is sectional view wherein, b) is vertical view.

Fig. 2 illustrates a kind of according to rotor of the present invention, a) is sectional view wherein, b) is vertical view, and c) be side-view.

Fig. 3 illustrates another embodiment according to rotor as shown in Figure 1 of the present invention, a) is sectional view wherein, b) is vertical view, and c) be side-view.

Fig. 4 illustrates another embodiment, in this embodiment, replaces each spaced walls with an inner rotator.

Fig. 5 illustrates another embodiment according to a kind of rotor of the present invention, and this rotor has some spaced walls, and these spaced walls illustrate with sectional view.

Fig. 6 is illustrated in the controlled trial result curve figure under three kinds of different RPM (rotations per minute) value.

As mentioned above, Fig. 1 illustrates a kind of known rotor, this rotor such as the applicant's Norwegian Patent N0.155, and No. 447 are described.This rotor comprises a hollow rotary symmetric body, slick surface inside and outside this rotary symmetric body has, and in its bottom and each side, be equipped with opening 5,9.This rotary symmetric body 1 is connected on the axle 2, and this axle 2 drives with a drive unit (not shown) again.Gas and/or particulate matter are supplied with rotor by a boring 3, and when rotor turns round, that is when rotor rotation, gas and will be forced out through each opening 9 of side through the liquid that the hole 5 of bottom sucks rotors, and this gas will be distributed in the liquid subtly.

Fig. 2 illustrates first example according to a kind of rotor of the present invention.This rotor comprises a rotary symmetric body 1, and this symmetric body 1 is preferably cylindrical, and it has inside and outside slick surface, and is connected on the axle 2, and this axle 2 has a co-axial boring 3, is used for supply gas and/or particulate matter.This axle 2 is connected on the drive unit (not shown), and is driven by this drive unit.

Special Circumstances of the present invention are, rotator 1 is equipped with the rotary symmetrical spaced walls 4 of an inside, and this spaced walls 4 just extends to below the opening in rotator 15, and at spaced walls 4 upper ends, it is a kind of funnel shaped part 6 and stretches out, and is fixed to the inside of this rotator 1.Therefore, spaced walls 4 defines central cavity 7 and annulus 8 of an inside.In the example shown here, rotator 1 is equipped with 4

upper surface holes

9 and 4 following faces 10, and these 4 upper surface holes 9 are corresponding to central cavity 7, and 4 following faces 10 are corresponding to annulus 8.In addition, spaced walls 4 is equipped with 4 holes 11, the connection that these 4 holes 11 form between a kind of central cavity 7 and the annulus 8.Can perhaps can setover along the periphery of rotor along same vertical line setting in these

holes

9,10,11.

Play a part as follows according to rotor of the present invention: rotor is down put into for example molten metal of a kind of liquid, and make this rotor rotation.Because this rotor rotation and the centripetal force that in liquid, produces subsequently, liquid will be inhaled into now, and will extract out through via

hole

11 and 10, this liquid portion is the annular opening 5 that forms through between spaced walls 4 and the rotator 1, and part is through opening 12 suctions of central cavity 7 usefulness that formed by spaced walls 4.Simultaneously, via 3 gas supplied of the boring in the rotor spindle and/or particulate matter a part is extruded and passes top each hole 9, a part is extruded following each hole 11 of passing in rotor and the spaced walls 4.Go up the rubbing effect of liquid owing to act on the rotor outside, will on the outside in this hole, split into many little gas particles compositions immediately so flow through the gas in each hole 9.This gas is with through each hole 11 effusive liquid, a part is divided, and further flow to following each hole 10 in the rotor wall 1, and will with the identical mode of gas in each hole 9 of flowing through, on the outside in each hole 10, further split into little gas particles composition immediately.

Fig. 3 illustrates another embodiment of technical scheme shown in Figure 2.Rotator 1, spaced walls 4 and above with following each

hole

9,10 with shown in Figure 2 identical.Its difference is: cancelled each hole 11 in the spaced walls 4.The alternate scheme is, gas 13 supplies in the circular clearance 8 via respectively holing in the wall 14 in rotor 1 and the axle 2.With with the identical mode of real side shown in Fig. 2, gas is supplied in the central cavity 7 through the central bore 3 of axle in 2.

In this example, liquid will be inhaled into central cavity, and it is with through 3 gas supplied of holing, flow out through top each hole 9, and the liquid in the suction annulus 8 will flow out through each following hole 10 with 13 gas supplied of respectively holing in axle 2 and rotor wall 14.In addition, identical in principle of work and method and the above-mentioned example.Because 13 the result of respectively holing in rotor wall/axle, this technical scheme shown in Figure 3 is got up more expensive a little than technical scheme production shown in Figure 2.Yet the efficient of mixing the gas aspect is high slightly.

Described in claims, the invention is not restricted to shown in the accompanying drawing and above-mentioned example.For example, can be permanently connected to the spaced walls on the rotator 1, but utilize a connection sheet or other method, one second rotary symmetric body 16 is arranged in the inside of rotator 1 cavity, as shown in Figure 4.The wall of such second rotator 16 just forms a spaced walls 4.Concerning this second rotor, not exclusively screwin is favourable so that form a gap 17 between two rotors.This gas that is used in mistress 8 can be supplied with by the boring 3 on the axle and through two gap between rotor 17.

In addition, the invention is not restricted to a spaced walls.It can have two or more spaced walls or a plurality of inner rotator.Fig. 5 illustrates the example of a rotor 1, in this rotor 1, adopt three spaced walls 4, internal cavities is divided into a central cavity 7 and three annulus 8, gas can be used and the mode shown in Fig. 2 or 3 (not being shown in further detail), is supplied to easily in these annulus 8.

If use several spaced walls, then to compare with the technical scheme shown in 3 with Fig. 2, efficient can further be improved, and the consumption of gas/particle thing will further reduce.Test:

With one as shown in fig. 1 known rotor and as shown in Figure 3 carry out controlled trial according to new rotor of the present invention.These tests are to remove water oxygen with nitrogen.

Test in the container of each rotor in a water analog machine, this water analog machine has the discharge of 63l/min.The rotor of each test is 1: 2 with the ratio of standard size.Their outside dimension is identical, and has identical diameter in the bottom with each hole in the side.

Each rotor is by a motor drive, and this electric motor power under 50Hz and 910RPM is 0.55kW.This RPM regulates with a 3kW setter, and the model of this setter is the SiemensMicromaster type, and frequency range is 0-650Hz.

Using a pressure is 200 crust, the nitrogen in the 50 liter nitrogengas cylinders, and this gas is supplied with by the boring in the rotor spindle via the under meter of a Ficher type and Porter type reducing valve and rotor.Oxygen in the water is measured with YSI58 type oxygen amount meter (numeral meter).

In addition, utilize a 5px type (Spanner-Pollux GmbH) water meter to measure the water yield, the throughput of this water meter is 2.5m ³/ h.

And, utilize a SHIMPO DT-205 type digital tachometer to measure RPM.

In discharge is under the similarity condition of 63l/min, has tested two rotors in same container.After regulating the water yield, start each rotor, and RPM is transferred to desirable speed.When connecting source nitrogen, begin to measure oxygen and timing.At duration of test, adopt three different RPM values, promptly 630,945 and 1071RPM, Comparative Examples is 1: 1 a rotor, these three different RPM are respectively corresponding to 500,750 and 850RPM.And, adopt five kinds of different gas volumes at duration of test: 12.6; 25.2; 37.8; 50.4 and 63l/min nitrogen.

For according to the present invention's rotor as shown in Figure 3, gas imports in 4 kinds of different modes:

Gas only imports in last round;

Gas is only importing in the round down;

Import at two rows hole moderate, gas gross is 12.6; 25.2; 37.8; 50.4; 63l/min nitrogen.

The amount of gas doubles, that is imports gas in every round: 12.6; 25.2; 37.8; 50.4 and 63l/min nitrogen.

Test-results is shown in Figure 6, and Fig. 6 illustrates three graphic representations, and wherein each RPM value is with a graphic representation.Known rotor as shown in Figure 1 all is decided to be " standard rotor " in each graphic representation, before the present invention was expected, this known rotor had been considered to best on the market aspect efficient and low disturbance and the stirring.

In these trials, can manage to make stirring and disturbance in the liquid (water) low as using according to new rotor of the present invention.Yet each graphic representation shows that under the low situation of the nitrogen amount of supplying with, the efficient (measuring as the oxygen of removing) of new rotor almost is a times of known rotor efficient from water, and under the situation of supplying with maximum amount nitrogen, improved efficiency about 50%.These graphic representations also show, in the occasion that nitrogen is supplied in the rotor, that is no matter nitrogen are supplied with upward round or round down, or supply with two rounds simultaneously, and are all very unimportant.This is owing to realized that with new rotor good bubble distributes, and the fact is, gas before the distribution of coming out through two rounds, a part of gas by back-pressure in rotor.

Claims

1. rotor, be used for handling a kind of liquid such as molten metal by adding gas and/or particulate matter, this rotor comprises a hollow rotator (1), this hollow rotator (1) has some openings (5,9,10) in bottom and side, this hollow rotator (1) is installed on the axle (2), and drive this hollow rotator with a drive unit by this axle (2), and this rotor is designed to and leaves liquid when rising and enter liquid when putting down, and it is characterized in that:

Hollow rotator (1) is equipped with at least one spaced walls (4) in its cavity, or at least one rotary symmetrical hollow body, so that form one or more annulus (8) and a central cavity (7), and through each annulus (3 in corresponding interval wall or the hollow body, 13) and/or hole (11), gas and/or particulate matter are supplied in this annulus (8) and the central cavity (7).

2. rotor as claimed in claim 1 is characterized in that:

By the coaxial boring (3) in the axle (2), gas and/or particulate matter are supplied in the central cavity (7), and with a part of gas and/or particulate matter by each hole (11) in the spaced walls (4), supply to the annulus (8) from central cavity (7).

3. rotor as claimed in claim 1 is characterized in that:

By the boring (3,13) that separates, gas and/or particulate matter are supplied in central cavity and the one or more annulus.