CN105498607A - Rotation runner plug-flow-type large stirring tank - Google Patents

Abstract

The invention provides a rotation runner plug-flow-type large stirring tank which comprises an outer cylinder and a rotating shaft. Impellers are fixedly arranged on the rotating shaft. An inner cylinder is arranged inside the outer cylinder. The inner cylinder is fixed into the outer cylinder through a support. The outer diameter of the inner cylinder is 0.25-0.4 the inner diameter of the outer cylinder, and the height of the inner cylinder is 0.8-0.9 that of the outer cylinder. The inlet end of the inner cylinder is lower than the liquid level. The inlet end of the inner cylinder is in a streamline arc. The impellers are arranged in the inner cylinder. A fixed wing is arranged on the wall of the inner cylinder and located below the impellers. The number of blades is one or two larger than the number of the impellers. A strip-shaped groove is formed in the lower end of the inner cylinder. The height of the strip-shaped groove is 0.4-0.6 that of the inner cylinder. According to the rotation runner plug-flow-type large stirring tank, better stirring uniformity can be obtained, and the difference between the concentration of a high-layer suspension and the concentration of a low-layer suspension can be controlled within about 5%. Meanwhile, compared with the prior art, power can be saved by more than one third.

Description

The large-scale tank diameter of a kind of revolution runner pulling flow type

Technical field

The present invention relates to a kind of heavy construction tank diameter, particularly the improvement of mixing drum structure.

Background technology

Existing heavy construction tank diameter comprises cylindrical shell, and rotating shaft is arranged in cylindrical shell, and rotating shaft differing heights position is equidistantly provided with the axisymmetric agitation blades of N layer, and rotating shaft drives agitation blades together to rotate, liquid in mixing drum.This is a kind of vertical multi-layer agitating mode, and the multiple agitating devices namely by being installed in series on a shaft, differing heights position is stirred suspension.The agitator of this structure, suspension cannot realize circulating up and down, can only stir on respective height, under gravity, suspension fully can not mix along short transverse in cell body, and cause levels solution concentration difference comparatively large, the turbid liquid concentration uniformity obtained is very undesirable; The drive efficiency of this multiple agitating devices be installed in series is very low simultaneously, and power consumption is large, both wastes energy, and turn increases production cost.

Improving the mixing uniformity of suspension in tank diameter, is one of key technology improving the solution of tank diameter performance need.Simultaneously; along with showing especially of world energy sources and environmental crisis; for industrial enterprise; that reduction energy cost increasing pressure is large on the one hand; on the other hand under current energy-saving and emission-reduction are subject to the situation of international community's extensive concern; high-energy equipment to eliminate with renewal be a kind of inexorable trend, the Novel mixing tank of exploitation high-efficiency low energy consumption oneself become the active demand of the relevant industries such as chemical industry.

Summary of the invention

The problems such as the mixing uniformity existed for above-mentioned prior art is poor, efficiency low energy consumption is high, the present invention proposes a kind of revolution runner pulling flow type tank diameter, to improve in groove the uniformity stirring turbid liquid concentration, reduce power consumption.

The one revolution runner pulling flow type tank diameter that the present invention proposes, comprise urceolus, rotating shaft, rotating shaft is fixed with impeller, it is characterized in that, be provided with inner core in urceolus, inner core by being supported and fixed in urceolus, the external diameter of inner core and be highly respectively 0.25 ~ 0.4 and 0.8 ~ 0.9 of urceolus internal diameter and height, the entrance point of inner core is lower than liquid level, and the entrance point of inner core is streamlined circular arc; Impeller is placed in inner core, and the inner tube wall of inner core is equipped with fixed-wing, and fixed-wing is positioned at the downstream of impeller, and the blade quantity of impeller is 2 ~ 4, and the fixed-wing number of blade is 3 ~ 6; Inner core lower end has bar-shaped trough, and the height of bar-shaped trough is 0.4 ~ 0.6 of inner core height.

The port of export of described inner core is streamlined circular arc.

The width sum of the bar-shaped trough of described inner core and the ratio of inner core external diameter are 0.04 ~ 0.18, and bar-shaped trough quantity is 6 ~ 10.

The disk ratio of described impeller is that the number of blade is multiplied by 0.07 ~ 0.1.

The blade of described impeller is radial varying pitch form, and pitch size is determined according to the flow velocity stirred required for flowing, geometrical mean pitch 0.6 ~ 0.8.

The large-scale tank diameter of the present invention's one revolution runner pulling flow type, by setting up a circulatory flow between inner core and urceolus, adopt fixed-wing and blade wheel structure, promote suspension to carry out circulating and whisking in tank diameter, thus obtaining good mixing uniformity, the concentration difference of high and low layer suspension can be controlled in about 5%, simultaneously, compared with prior art, power more than 1/3rd can be saved.

Accompanying drawing explanation

Fig. 1 is the structural representation that the present invention turns round the large-scale tank diameter of runner pulling flow type

Fig. 2 is the E-E view of Fig. 1;

Fig. 3 is the F-F view of Fig. 1.

In figure: 1-urceolus, 2-inner core, 3-rotating shaft, 4-impeller, 5-fixed-wing, 6-bar-shaped trough, 7-motor, 8-support.

Detailed description of the invention

Turn round runner pulling flow type tank diameter below in conjunction with accompanying drawing to the present invention to be described in detail.

The technical characterstic of revolution runner pulling flow type tank diameter of the present invention can be summarized as:

1. low-resistance revolution runner:

As shown in Figure 1, turn round runner pulling flow type tank diameter and comprise urceolus 1, inner core 2.Space in cell body is separated into two parts by inner core, namely the space between the interior space of inner core and inside and outside cylinder, after the suspension promoted via impeller is sprayed by inner core, upwards returned by the space between inside and outside cylinder and enter inner core, establish a circulatory flow.Inner core 2 utilizes support 8 to be fixed in urceolus 1, the quantity supporting 8 is determined according to the height of inner core 2, to ensure that inner core 2 can be stably fixed in urceolus 1, urceolus 1 is divided into two spaces by inner core 2, the i.e. space of inner core 2 inwall formation, and the space formed between inner core 2 outer wall and urceolus 1 inwall, as shown in Figure 2, the flowing that the latter is suspension provides circulatory flow, suspension can be returned and enter inner core 2.The entrance point of inner core 2 and the port of export are streamlined circular arc, to eliminate suspension in formation slough, gateway and recirculating zone, thus ensure the evenly smooth and easy and low-resistance characteristic of circulatory flow.The camber exit curve shape that inner core outlet and entrance all adopt following method to determine, slough and recirculating zone can be eliminated in such gateway, ensure that the evenly smooth and easy of runner and low-resistance characteristic, and this is one of important connotation of this patent.The evaluates calculation computation hydrodynamic methods of runner hydrodynamic characterisitic, solves N-S equation.

Fluid Mechanics Computation mainly solves can not press N-S fluid governing equation, because N-S equation solution demand fulfillment covers turbulent flow energy spectrum, physical quantity needs to meet the requirement of both macro and micro in time scale and space scale simultaneously, and causing that amount of calculation is huge cannot engineer applied.All physics amounts represent for average magnitude and pulsating quantity sum by the time averaging method of general employing, and revise N-S equation and obtain so-called RANS equation (1), (2), then adopt finite volume method solve this fluid governing equation, and introduce corresponding turbulence model make governing equation close.Solve this fluid governing equation namely can obtain in flow field velocity field distribution and pressure field distribution, for analyzing the mobility status in flow field.

$\frac{\∂u_i}{\∂x_i}=0---\left(1\right)$

$\mathrm{\ρ}\frac{\∂u_i}{\∂t}+{\mathrm{\ρu}}_j\frac{\∂u_i}{\∂x_j}=-\frac{\∂p}{\∂x_i}+\frac{\∂}{\∂x_j}\left(\mathrm{\μ}\frac{\∂u_i}{\∂x_j}-\mathrm{\ρ}\stackrel{\‾}{u_i^{\′}{u}_j^{\′}}\right)---\left(2\right)$

Generally speaking, inner core external diameter is determined according to urceolus internal diameter Dc, gets 0.25Dc ~ 0.4Dc; Inner core height determines according to urceolus height H c and conventional solution height, and upper end is lower than liquid level 0.5Dc ~ 1.0Dc, and inner core height H n gets 0.8Hc ~ 0.9Hc; Inner core import and export is streamlined in shape.The entrance point of inner core 2, lower than liquid level, is 0.5 ~ 1.0 of urceolus 1 external diameter.

2. efficient impeller:

The efficient impeller be made up of impeller and fixed-wing is this patent another feature.As the core component of agitator, to pursue the high efficiency of its power conversion for target in design, for reduction tank diameter installed power, reduce energy resource consumption and there is decisive role.

Generally speaking, efficient impeller impeller 4 is arranged in rotating shaft 3, and the diameter of impeller 4 is slightly less than the internal diameter of inner core 2, and the number of blade is 2 ~ 4 leaves, and blade section is the streamlined wing profile with camber.Disk ratio changes with the number of blade, and disk ratio is that the number of blade is multiplied by 0.07 ~ 0.1, and the blade of impeller 4 is radial varying pitch form, and pitch size is determined according to the flow velocity stirred required for flowing, geometrical mean pitch 0.6 ~ 0.8.The rotating shaft 3 that impeller 4 is housed is placed in inner core 2, and rotating shaft 3 is driven by motor 7.

The inner tube wall of inner core 2 is equipped with fixed-wing 5, fixed-wing 5 is positioned at the below of impeller 4, to reduce the rotation energy loss of impeller wake flow, improves impeller plug-flow efficiency further, reduces the energy resource consumption of tank diameter.The blade tip of fixed-wing 5 adopts welding manner to be connected with inner core 2 inwall, blade quantity 3 ~ 6.The parameters such as blade angle need be determined in impeller design process together with impeller parameters.

3. bar-shaped trough is opened in inner core lower end:

Inner core 2 lower end has bar-shaped trough 6, the flow resistance startup stage of to reduce, be beneficial to the foundation that entirety circulates, as shown in Figure 3, the height of bar-shaped trough 6 is 0.4 ~ 0.6 of inner core height, the width of bar-shaped trough 6 is not more than 400 millimeters, and the ratio of the width sum of bar-shaped trough 6 and inner core (2) external diameter is 0.04 ~ 0.18, and the quantity of bar-shaped trough 6 is 6 ~ 10.

During work, motor 7 drives the impeller 4 in rotating shaft 3 to rotate, impeller 4 and the fixed-wing 5 be arranged on inner core 2 inwall form efficient impeller, suspension in groove is sucked by inner core 2 top, stir after acceleration through impeller and spray from inner core 2 lower end, circulatory flow again between urceolus 1 and inner core 2 flows above cell body, again be inhaled on inner core 2 top, form one evenly, circulate smoothly, in such a process, suspension and liquid current downflow on constantly, mix fully and stir, after a period of time is run, suspension concentration in groove just can reach very uniform degree.

Claims (5)

1. the large-scale tank diameter of revolution runner pulling flow type, comprise urceolus (1), rotating shaft (3), rotating shaft (3) is fixed with impeller (4), it is characterized in that, inner core (2) is provided with in urceolus (1), inner core (2) is fixed in urceolus (1) by supporting (8), the external diameter of inner core (2) and be highly respectively 0.25 ~ 0.4 and 0.8 ~ 0.9 of urceolus (1) internal diameter and height, the entrance point of inner core (2) is lower than liquid level, and the entrance point of inner core (2) is streamlined circular arc; Impeller (4) is placed in inner core (2), fixed-wing (5) inner tube wall of inner core (2) is equipped with, fixed-wing (5) is positioned at the downstream of impeller (4), the blade quantity of impeller (4) is 2 ~ 4, and fixed-wing (5) number of blade is 3 ~ 6; Inner core (2) lower end has bar-shaped trough (6), and the height of bar-shaped trough (6) is 0.4 ~ 0.6 of inner core height.

2. the large-scale tank diameter of revolution runner pulling flow type according to claim 1, is characterized in that the port of export of inner core (2) is streamlined circular arc.

3. the large-scale tank diameter of revolution runner pulling flow type according to claim 1 and 2, it is characterized in that the width sum of the bar-shaped trough (6) of inner core (2) and the ratio of inner core (2) external diameter are 0.04 ~ 0.18, bar-shaped trough quantity is 6 ~ 10.

4. the large-scale tank diameter of revolution runner pulling flow type according to claim 1 and 2, is characterized in that the disk ratio of impeller (4) is 0.07 ~ 0.1 of the number of blade.

5. the large-scale tank diameter of revolution runner pulling flow type according to claim 4, is characterized in that the blade of impeller (4) is radial varying pitch form, and pitch size is determined according to the flow velocity stirred required for flowing, geometrical mean pitch 0.6 ~ 0.8.