KR20090069159A - Double suction type mixer - Google Patents

Abstract

A two-way suction mixing apparatus is provided to mix the upper and lower layer liquid of a water tank continuously and circulate it, thereby preventing the deterioration of the mixing efficiency due to the precipitation and floating by different density. A two-way suction mixing apparatus comprises an underwater motor(17) which exists in the lower part of a water tank(10), is supported by a supporter(19) and has a hollow rotation shaft(18) for inhaling the lower layer liquid; a guide pipe(12) where the upper layer liquid of the water tank is flown; an upper impeller cover(13) which is connected with the lower part of the guide pipe and a lower impeller cover(14) which is connected with the upper part of the underwater motor to inhale the flown upper layer liquid and lower layer liquid so as to mix them, thereby reducing the resistance of water current in case of discharging at the middle part and preventing the dispersion of fluid; an impeller(15) which is installed at the inner space between the upper impeller cover and the lower impeller cover, is driven by the underwater motor, and mixes the upper layer liquidflown through the guide pipe and the lower layer liquidflown through the hollow rotation shaft to discharge it to the outer side between the upper impeller cover and the lower impeller cover; and a guide plate(16) which is installed at the edge of the lower impeller cover and the upper impeller cover to guide for the mixed upper and lower layer liquid to be discharged to the centrifugal direction.

Description

Two-way suction agitator {Double Suction Type Mixer}

The present invention relates to a stirring device used for mixing a drug or a liquid widely used in the water treatment process, and relates to a stirring device that can be stirred more uniformly and efficiently by allowing the stirring and circulation of the liquid at the same time.

Stirring or mixing is a very important unit operation in the water treatment field.

For example, flocculants such as aluminum sulfate / iron sulfate, coagulants such as polyelectrolytes and lime can be added to the wastewater or sludge to produce flocculation or to promote the digestion of biological (organic) sludge in an anaerobic digestion process. To this end, many different components need to be thoroughly mixed, such as when waste water and sediment, organic matter and microorganisms need to be mixed more uniformly.

In the prior art stirring device for this mixing, a paddle type or turbine type stirring device as shown in FIG. 1 is used. In this prior art, an impeller 3 connected to the rotating shaft 2 of the motor 1 is provided. As it rotates in the fluid, turbulence occurs around it and mixing is achieved by the turbulence.

In addition, in the case of the turbine type stirring device (the right side of FIG. 1), which is a typical stirring device used in the wastewater treatment plant, the diameter of the impeller 1 is so large that it occupies about 30-50% of the width or length of the tank. The peripheral speed of the impeller 3 is not large, 1.5 to 2.5 m / sec.

However, when the impeller 1 is rotated at a low speed using a large impeller, the boundary layer is increased due to the low speed movement of the impeller, and the fluid flows to a long distance.However, the mixing effect is reduced due to the laminar flow, which reduces the mixing effect. In consideration of the fact that the reaction of the flocculating agent proceeds in a very short time of 0.1 msec to 1 sec, it is impossible to induce adsorption-charge neutralization by sufficiently contacting the contaminant with the flocculating chemical within a short time.

On the other hand, the use of a high speed impeller increases the turbulence intensity and shortens the mixing time. However, the boundary layer is further reduced so that the flow is limited to only the periphery of the impeller (3), resulting in more local mixing. It doesn't work.

In addition, in the related art, when the impeller 3 is used, vortex or mass-swirling of the fluid occurs due to the rotation of the impeller 3, so that the difference between the fluid speed and the impeller 3 speed is different. As it is reduced, not only the mixing effect is significantly lowered, but also energy loss is caused.

In order to prevent this, additional measures such as installing the impeller 3 to one side or installing a baffle plate are necessary, and thus energy loss is further increased, and different components have different densities. Therefore, due to the difference between the liquid and the density is respectively floated or precipitated, the mixing efficiency is further lowered.

In particular, since the long rotating shaft 2 is used to transmit power to the impeller 3 in the water of the boat by the motor 1, which is a power source on the surface of the water, eccentricity is likely to occur during operation due to agitated water flow. The bearings are easily broken, which is the main cause of the agitator failure.

In order to solve the above problems, the upper and lower liquids (or left and right liquids) in the tank are simultaneously sucked by the impeller, stirred, discharged, and circulated to discharge, resulting in flotation and precipitation due to different densities. This prevents the deterioration and provides a stirring device capable of uniformly mixing the entire liquid in the tank more efficiently while using a minimum of energy because all the liquid in the tank is circulated through the impeller.

In addition, the present invention by driving the impeller directly using the submersible motor without using a long rotating shaft for supporting the impeller and transmitting power, provides an efficient and stable stirring device without damage to the coupling, bearings, etc. during operation.

In order to achieve the above technical problem, this invention is the bidirectional suction stirring apparatus which continuously mixes and circulates the upper and lower layer liquid in a water tank,

An underwater motor (17) existing under the water tank (10), supported by a pedestal (19), and having a hollow rotating shaft (18) for sucking the lower layer liquid; Induction pipe 12 into which the supernatant in the water tank 10 is introduced; The upper impeller cover 13 connected to the lower part of the induction pipe 12, which lowers the resistance of the water flow and prevents the fluid from flowing when inhaling and mixing the incoming supernatant and the lower layer liquid and discharging the intermediate layer. A lower impeller cover 14 connected to the upper portion of the underwater motor 17; It is installed in the inner space between the upper impeller cover 13 and the lower impeller cover 14, driven by the submersible motor 17, the supernatant and the hollow rotary shaft 18 introduced through the induction pipe 12 Impeller 15 to mix the lower layer fluid flowing through the discharge to the outside between the upper impeller cover (13) and the lower impeller cover (14); It is installed on the edge of the upper impeller cover 13 and the lower impeller cover 14, it characterized in that it comprises a guide plate 16 to guide the mixed upper and lower liquid is discharged in the centrifugal direction.

By using the bidirectional suction stirrer of the present invention as described above, the diameter of the impeller 15 is much smaller than that of the conventional stirring device, so that it can be driven with minimal power, and the fluid is covered inside the impeller 13 and 14. By inducing and intensively stirring to create two circulation loops (loop) above and below the cover 13 and 14, the entire liquid of the water tank 10 is circulated, and the mixing efficiency is extremely high.

In particular, since the impeller 15 is directly driven by the submersible motor 17, the rotating shaft is short, so there is little eccentric force due to the stirring water flow of the rotating shaft during operation, so that there is no fear of damage such as coupling / bearing which is frequently generated in the stirring apparatus.

Hereinafter, the specific configuration and operation of the first embodiment of the present invention will be described with reference to FIG.

In the stirring device of the present invention, the discharge port 11 has an advantageous shape for venturi or other water flow so that the resistance of the water flow is small when the upper and lower fluids of the fluid in the water tank 10 are sucked / mixed and discharged. An upper impeller cover (13), a lower impeller cover (14) and a guide plate (16), the upper impeller cover (13) and the lower impeller cover (14) are provided on the guide plate (16) in the discharge port (11). There is a centrifugal impeller 15 connected between the upper impeller cover 13 and the lower impeller cover 14, and an underwater motor 17 for driving the centrifugal impeller 15. ) Is connected to the lower end of the centrifugal impeller 15 by a hollow rotating shaft 18 (inner hollow pipe form). Then, the pedestal 19 is installed at the bottom of the submersible motor 17 to support the entire apparatus.

As a result, the stirring device of the present invention is a two-way suction type stirring device that sucks up and down the fluid by the supernatant guide pipe 12 and the hollow rotating shaft 18 and discharges it through the discharge port 11 in the middle.

That is, the fluid in the upper impeller cover (13) and the lower impeller cover (14) is discharged to the outside of the cover (13, 14) in the impeller centrifugal direction by the rotation of the centrifugal impeller (15), so that the negative pressure is the upper impeller cover As the fluid is sucked into the cover 13 and 14 at the lower part of the upper and lower impeller covers 14 of 13, the fluid is sucked into the impeller 15 in both up and down directions and discharged out of the cover 13 and 14 again. Up and down circulation and stirring takes place.

In addition, the guide pipe 12 and the hollow rotating shaft 18 induces the fluid to flow smoothly toward the impeller 15 in the same direction as the drive shaft of the impeller 15, the upper and lower fluids collide up and down in the impeller 15, As the direction of movement of the impeller 15 and the direction of fluid flow are perpendicular to each other, turbulence occurs because the direction of fluid changes rapidly vertically around the impeller 15 by the rotation of the impeller 15.

Accordingly, the upper and lower liquids of the water tank 10 are mixed around the impeller 15, and the fluid mixed in the radial direction by the rotational movement of the impeller 15 is discharged through the discharge port 11.

In addition, since the fluid discharged to the outside of the cover 13 and 14 has a speed not only in the centrifugal direction but also in the rotational (tangential) direction by the rotation of the impeller 15, the discharge port between the upper and lower impeller covers 13 and 14 ( 11), the guide plate 16 installed in the vertical-central direction sharply changes the direction of motion of the fluid moving in the rotational direction to the centrifugal direction, further increasing turbulence, increasing the mixing efficiency, and moving in the rotational direction. Since the fluid is discharged in the centrifugal direction, the discharge amount and the discharge effective radius are also increased.

In addition, when the depth of the water tank 10 is deep, the neck of the guide pipe of the upper impeller cover 13 can be made longer in a cylindrical shape, and when the water level fluctuates severely, as shown in FIG. Neck is a double slide (slide) structure (30) to the upper portion suspended from the buoys 31 to automatically change the position of the inlet 32 of the upper impeller cover 13 in accordance with the water level change.

On the other hand, in general, the power required for driving the impeller is proportional to about three powers of the impeller diameter in the case of laminar flow and about 5 powers of the impeller diameter in the case of turbulence, so the power required to form laminar flow or turbulence is It is well known that all are very sensitive to the size of the impeller diameter.

That is, as the impeller diameter increases, the required power increases exponentially, and it is preferable to reduce the diameter of the impeller as small as possible. However, when the diameter of the impeller is smaller, the stirring radius is also smaller.

However, in the stirring device of the present invention, the impeller 15 is equipped with covers 13 and 14 so that the liquid in the water tank 10 circulates while allowing the agitated fluid to spread far, so that the impeller diameter is at least the stirring radius is large.

Furthermore, since the guide plate 16 prevents the mass-swirling phenomenon in which the liquid rotates in accordance with the rotation of the impeller 15 in the cover 13, 14, the rotary flow rotating along the impeller 15. Not only increases the mixing rate and chemical dissolution rate as turbulence increases, but also causes the rotating fluid to radiate further in the radial direction (transverse direction). do.

As a result, the bidirectional suction stirrer according to the present invention concentrates water flow into the cover 13 and 14 by the impeller cover 13 and 14 to stir, and guides the impeller cover 13 and 14 in the fluid circulation. By guiding the flow of the fluid further and smoothly by the flow inducing action of the plate 16, the impeller 15 is superior to the size of the impeller of the prior art stirring device, which is 30-50% of the width or length of the tank. Since it is necessary to reduce, the required power can be reduced by that much. In addition, since the fluid mixed by the fluid circulation is uniformly transferred to all parts of the water tank 10, the energy consumption is reduced, and all the places in the water tank 10 become very uniform.

3 is a second embodiment of the present invention, in which the underwater motor 7 having the hollow rotating shaft 18 of FIG. 2 is expensive and the flow rate flowing into the hollow rotating shaft 18 is limited to the diameter of the hollow rotating shaft 18. It is intended to compensate for the disadvantages of being small.

The bidirectional suction stirrer of FIG. 3 is the upper impeller cover 13 and the lower impeller cover 14 to suck and mix the supernatant and the lower layer of the fluid in the water tank 10, as in the embodiment according to FIG. And a guide plate 16, connecting the upper impeller cover 13 and the lower impeller cover 14 to the guide plate 16 and centrifuging between the upper impeller cover 13 and the lower impeller cover 14. The type impeller 15 is mounted. In addition, the impeller 15 is driven by the drive shaft of the submersible motor 20 installed in the lower impeller cover (14). Then, the pedestal 19 is installed at the bottom of the submersible motor 20 to support the entire apparatus.

In the first embodiment of FIG. 2, the fluid in the lower layer of the tank is sucked through the hollow rotating shaft 18 of the submersible motor 17. However, in the embodiment of FIG. The difference is that it sucks through the space between the lower impeller covers 14.

Since the space between the subsea motor 20 and the lower impeller cover 14 in this embodiment is larger than that in the cross section of the hollow rotating shaft 18 of the underwater motor 17 in FIG. There is an advantage, but there is also a disadvantage that the lower impeller cover 14 is more complicated.

Also, as can be seen by comparing the left and right views of Fig. 3, the length of the rotation shaft between the underwater motor 20 and the impeller 15 is varied so that the length of the lower impeller cover 14 from the underwater motor 20 of the lower impeller cover 14 is different. 3, the length of the apparatus in the left view of FIG. 3 is long, so that the space between the submersible motor 20 and the lower impeller cover 14 is large, so that the suction flow rate is larger than that of the apparatus in the right view.

4 is a third embodiment of the present invention, in which the neck of the neck of the guide tube 12 of the upper impeller cover 13 is a double slide structure 30 and a buoy 31 is placed on the upper portion. Suspended, this buoy 31 is moved up and down in accordance with the water level fluctuation, and the inlet pipe 12 is slid by the double slide structure to fluctuate the inlet position 32 up and down, so as to operate smoothly even in the water level fluctuation. .

In addition, when the screen or the perforated plate 33 is installed in the lower cylinder of the neck, the poorly dissolved granular chemicals stay in the flowing fluid for a long time, thereby increasing the dissolution rate.

In addition, if the stirring stick 34 is installed directly on the screen or the perforated plate 33 to be interlocked with the impeller 15, the physical stirring is further performed by the rotating stirring stick 34, so that it is more easily dissolved. The dissolution rate is further increased.

In addition, when there is a large amount of foreign matter such as cloth or thread in the liquid, a cutter blade (not shown) is directly connected to the perforated plate 33 together with the rotary shaft of the impeller 15 so that foreign matter such as cloth or thread is different from the cutter blade. It can be engaged with the stencil 33 to crush the foreign matter.

Fig. 5 is a fourth embodiment of the present invention, which shows a bidirectional suction stirring apparatus for mixing fluids having different left and right components. The overall structure or operation is the same as that in FIG. 2 except that the pedestal 35 is used to support the bidirectional suction stirrer of FIG. In FIG. 5, the structure of FIG. 3 is shown lying down, but it is also possible to use the structure of FIG. 2 lying down.

On the other hand, while the preferred embodiment of the present invention has been described above, it should be noted that the present invention is not limited to this embodiment, and various modifications and changes can be made without departing from the spirit of the present invention.

1 shows a paddle type or turbine type stirring device according to the prior art.

Figure 2 is a view for explaining the configuration and operation of the two-way suction stirring apparatus according to the first embodiment of the present invention, the flow of fluid.

3 is a second embodiment of the present invention, showing a two-way suction agitation device when more suction of the lower layer liquid is required.

Figure 4 shows a two-way suction agitation device for more chemical dissolution as a third embodiment of the present invention.

Fig. 5 is a fourth embodiment of the present invention, showing a bidirectional suction stirrer for mixing fluids having different left and right components.

Claims (7)

In the two-way suction stirring device for continuously mixing and circulating the upper and lower liquid in the tank, An underwater motor (17) existing under the water tank (10), supported by a pedestal (19), and having a hollow rotating shaft (18) for sucking the lower layer liquid; Induction pipe 12 into which the supernatant in the water tank 10 is introduced; The upper impeller cover 13 connected to the lower part of the induction pipe 12, which lowers the resistance of the water flow and prevents the fluid from flowing when inhaling and mixing the incoming supernatant and the lower layer liquid and discharging the intermediate layer. A lower impeller cover 14 connected to the upper portion of the underwater motor 17; It is installed in the inner space between the upper impeller cover 13 and the lower impeller cover 14, driven by the submersible motor 17, the supernatant and the hollow rotary shaft 18 introduced through the induction pipe 12 Impeller 15 to mix the lower layer fluid flowing through the discharge to the outside between the upper impeller cover (13) and the lower impeller cover (14); Upper and lower layer liquid in the water tank, characterized in that it is provided at the edge of the upper impeller cover 13 and the lower impeller cover 14, guide plate 16 to guide the mixed upper and lower liquid is discharged in the centrifugal direction Two-way suction agitator for continuously mixing and circulating the. In the two-way suction stirring device for continuously mixing and circulating the upper and lower liquid in the tank, A submersible submersible motor 20 existing under the water tank 10 and supported by the pedestal 19; Induction pipe 12 into which the supernatant in the water tank 10 is introduced; An upper impeller cover (13) connected to the lower part of the induction pipe (12), which absorbs and mixes the incoming supernatant and the lower layer solution to reduce the resistance of the water flow and prevent the fluid from being disturbed when discharged from the middle portion; A lower impeller cover 14 existing above the submersible motor 20; Installed in the inner space between the upper impeller cover 13 and the lower impeller cover 14, driven by the submersible motor 20, the supernatant flowing through the induction pipe 12 and the submerged motor An impeller (15) for mixing the lower layer liquid flowing through the space between the (20) and the lower impeller cover (14) to discharge outwardly between the upper impeller cover (13) and the lower impeller cover (14); And an induction plate 16 installed at the edges of the upper impeller cover 13 and the lower impeller cover 14 to guide the mixed upper and lower liquids to be discharged in the centrifugal direction. Two-way suction agitator for continuously mixing and circulating the. The method according to claim 1 or 2, The neck portion of the induction pipe 12 is a double slide structure 30 and the buoy 31 which moves up and down according to the water level fluctuation is installed on the upper part of the induction pipe 12 to cover the upper impeller according to the water level fluctuation ( 13) A two-way suction agitation device for continuously mixing and circulating the upper and lower liquids in a water tank, characterized in that the position of the suction port (32) is varied. The method according to claim 1 or 2, In the lower part of the induction pipe 12, a screen or a porous plate 33 for collecting insoluble granules is installed, and an agitating stick connected to an upper portion of the screen or the porous plate 33 like a rotating shaft of the impeller 15 ( A two-way suction agitator for continuously mixing and circulating the upper and lower layer liquids in the water tank, characterized in that 34) is installed to stir the granules by a rotating stirring stick (34). The method according to claim 1 or 2, The lower portion of the induction pipe 12, the porous plate 33 is installed, the cutter plate is connected to the upper portion of the porous plate 33, such as a rotating shaft of the impeller 15, characterized in that to crush the foreign matter, Bi-directional suction agitator for continuously mixing and circulating the upper and lower liquid in the tank. In the two-way suction agitator for continuously mixing and circulating the left and right liquid in the tank, An underwater motor existing on one side of the water tank and having a hollow rotating shaft for sucking liquid on one side; An induction pipe into which the liquid on the other side in the tank flows; The other impeller cover connected to the induction pipe side and the submersible motor side connected to the induction pipe side, which reduces the flow resistance and prevents the fluid from being disturbed when the liquid on the one side and the liquid on the other side are sucked and mixed and discharged from the middle portion. One side impeller covering; It is installed in the inner space between the other impeller cover and the one side impeller cover, driven by the submersible motor, and mixed with the other side liquid flowing through the induction pipe and the one side liquid flowing through the hollow rotating shaft to cover the one impeller An impeller to discharge to the outside between the other impeller cover; An induction plate installed at an edge of the one impeller cover and the other impeller cover to guide the mixed liquid to be discharged in the centrifugal direction; And a support for supporting the entire bidirectional suction agitator, wherein the bidirectional suction agitator continuously mixes and circulates the left and right liquids in the water tank. In the two-way suction agitator for continuously mixing and circulating the left and right liquid in the tank, Simsil underwater motor present on one side of the tank; An induction pipe into which the other liquid in the tank flows; The other impeller cover connected to the induction tube, which is connected to the induction tube, to reduce the resistance of the water flow and to prevent the fluid from flowing when inhaling and mixing the liquid on the one side and the liquid on the other side discharged from the middle portion; One side impeller covering; One side that is installed in the inner space between the one impeller cover and the other impeller cover, driven by the underwater motor, the other liquid flowing through the induction pipe, and the one flowing through the space between the underwater motor and one impeller cover An impeller mixing the liquid and discharging outwardly between the one impeller cover and the other impeller cover; An induction plate installed at an edge of the one impeller cover and the other impeller cover to guide the mixed liquid to be discharged in the centrifugal direction; And a support for supporting the entire bidirectional suction agitator, wherein the bidirectional suction agitator continuously mixes and circulates the left and right liquids in the water tank.

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