KR102305738B1 - Mixer with inclined wing - Google Patents

Abstract

The present invention relates to an agitator with inclined stirring blades, comprising: a rotating shaft extending in a vertical posture from an upper part of a stirring tank used as a stirring place to an inside of the stirring tank, and provided to be rotatable with respect to a vertical axis; and a plurality of stirring blades having an inner end fixed to the rotating shaft and an outer end opposite to the inner end, located inside the stirring tank, and having a leading edge and a trailing edge leading and trailing when the rotation shaft is rotated as two sides connecting the inner end and the outer end. Each of the stirring blades is twisted so that the leading edge is positioned below the trailing edge, and is inclined so as to increase from the inner end to the outer end. According to the present invention, there is no problem with the bending of the stirring blades or the bending of the rotating shaft on which the stirring blades are fixed.

Description

Agitator with inclined stirring blades {MIXER WITH INCLINED WING}

The present invention relates to a stirrer used for mixing between coagulant and sludge, or between coagulant powder and water.

Sewage discharged from homes and factories is treated after being sent to a sewage treatment plant. The sewage treatment process includes a water purification process and a sludge treatment process. In the water purification process, sewage is purified to the extent that the river's self-cleaning action can be activated, and then discharged into public waters such as rivers. The sludge is treated through reduction processes such as thickening and dewatering. Concentration is a weight reduction process that primarily lowers the moisture content of sludge, and dehydration is a weight reduction process that lowers the moisture content of the sludge that has undergone the thickening process secondarily.

In this weight loss process (concentration, dehydration), the coagulant is generally mixed with the sludge to be reduced in order to improve the weight loss efficiency (concentration efficiency, dewatering efficiency). A stirrer is used as disclosed in No. (centrifugal dehydrator for sewage/wastewater sludge dewatering, coagulant input amount and dewatering residue reduction device) and Korean Patent Publication No. 10-1678993 (sludge coagulation and thickening device). And the coagulant is made by mixing the coagulant in powder form with water. Again, as disclosed in Patent Registration No. 10-1675025 (Coagulant Dissolving System) and Patent Publication No. 10-1409735 (Coagulant Dissolving Device), the coagulant powder and A stirrer is used for mixing the water.

The stirrer used for the above purpose includes a rotating shaft extending in a vertical direction, and stirring blades extending in a horizontal direction from the rotating shaft. And each stirring blade is twisted around the horizontal axis, the horizontal leading edge of the stirring blade that precedes when the rotation shaft rotates is positioned lower than the following horizontal trailing edge.

Registered Patent Publication No. 10-1256852 (Centrifugal dehydrator for sewage/wastewater sludge dewatering, coagulant input amount and dewatering residue reduction device) Registered Patent Publication No. 10-1678993 (sludge coagulation and thickening device) Registered Patent No. 10-1675025 (coagulant dissolution system) Registered Patent Publication No. 10-1409735 (coagulant dissolving device)

In general, in the stirred tank where the sludge and the coagulant are mixed, the surface of the sludge is not a perfectly horizontal plane, so some sections within the horizontal leading edge of the stirring blade come into contact with the sludge in the stationary state before stirring, and the load is suddenly applied first. will receive In addition, even in the stirred tank where the coagulant powder and water are mixed, since the surface of the coagulant is not completely horizontal, any section within the horizontal leading edge of the stirring blade also comes into contact with the coagulant in the stationary state before stirring to apply the load first. suddenly get

However, since the stirring blades are twisted around the horizontal axis, some sections within the upper horizontal leading edge are pressed down by the sudden load. In a sagging form, a problem occurs in which the stirring blades are bent, and in severe cases, even a problem in which the rotating shaft is bent with respect to the vertical axis occurs.

Therefore, the present invention is to provide a stirrer for solving these conventional problems.

The present invention provides a rotating shaft extending in a vertical posture from the upper part of the stirred tank used as a stirring place to the inside of the stirring tank, and rotatably provided with respect to the vertical axis; and an inner end fixed to the rotating shaft and an outer end opposite to the inner end, located inside the stirring tank, and connecting the inner end and the outer end with leading and trailing sides leading and trailing when the rotating shaft rotates It provides a stirrer having an inclined stirring blade comprising; a plurality of stirring blades having two sides. Here, each of the stirring blades is twisted so that the leading edge is positioned below the trailing edge, and is inclined so as to increase from the inner end to the outer end.

The fixing between the inner end of the stirring blade and the rotation shaft is made by being fixed after the boss to which the inner end of the stirring blade is fixed is fitted to the rotation shaft.

The outer end of the support member is fixed to the outer end of each of the stirring blades, and the inner end of the support member is fixed to the rotation shaft at a position higher than the inner end of the stirring blade.

The fixing between the inner end of the support member and the rotation shaft is made by fixing the boss to which the inner end of the support member is fixed after being fitted to the rotation shaft.

According to the present invention, a portion subjected to a sudden load by contact with a non-rotating stirring material is always limited to the area near the inner end of the stirring blades and does not reach the remaining outer portions of the stirring blades. There is no problem of bending of the rotating shaft on which the blades are fixed.

In addition, according to the present invention, the inclined posture of the stirring blades can be stably maintained by the support members.

In addition, according to the present invention, the operation of fixing the inner ends of the stirring blades and the inner ends of the supporting members to the rotation shaft can be made simply by the boss.

1 is a front view showing a stirrer having an inclined stirring blade according to the present invention.
Figure 2 is an enlarged perspective view of the stirring blade shown in Figure 1;

Hereinafter, preferred embodiments of a stirrer having an inclined stirring blade according to the present invention will be described in detail with reference to the drawings. The terms or words used below should not be construed as being limited to conventional or dictionary meanings, and on the basis of the principle that the inventor can appropriately define the concept of a term to describe his invention in the best way. It should be interpreted as meaning and concept consistent with the technical idea of the present invention.

The stirrer 100 having inclined stirring blades according to the present invention includes a rotating shaft 120 and a plurality of stirring blades 130 as shown in FIGS. 1 and 2 .

The rotating shaft 120 extends in a vertical posture along the vertical axis 120a and is provided to be able to rotate with respect to the vertical axis 120a. The upper end of the rotating shaft 120 is located above the stirring tank 110 used as a stirring place, and the lower end of the rotating shaft 120 is located inside the stirring tank 110 . The upper end of the rotating shaft 120 is coupled to the motor 122 , so that when the motor 122 is operated, the rotating shaft 120 rotates about the vertical axis 120a.

The motor 122 is fixedly installed on a separate support (not shown) fixed to the upper portion of the stirring tank 110 . And the stirring material 10 is supplied into the inside of the stirring tank 110 until it reaches a preset height. The stirring material 10 is a material to be stirred in the stirring tank 110 , and may be sludge and coagulant, coagulant powder, and water. The stirring material 10 may be supplied through a pipe (not shown) coupled to the lower surface of the stirring tank 110 , or may be supplied through an open upper surface of the stirring tank 110 .

Each of the plurality of stirring blades 130 is located inside the stirring tank 110 and has an inner end 136a and an outer end 136b. The inner end 136a of the stirring blade 130 is fixed to the rotating shaft 120 by being welded to the rotating shaft 120 after the boss 132 is fitted to the rotating shaft 120 in a state previously welded to the boss 132 . , the upper inner end (136a) is fixed to the rotation shaft 120 via the boss (132). The outer end 136b is opposite to the inner end 136a.

Each stirring blade 130 also has a leading edge (134a) and a trailing edge (134b), which are two sides connecting the inner end (136a) and the outer end (136b). The leading side 134a is a leading side when the rotating shaft 120 is rotated, and the trailing side 134b is a trailing side when the rotating shaft 120 is rotated.

Each stirring blade 130 is inclined so as to increase from the inner end (136a) to the outer end (136b). That is, as shown in FIG. 2 , each stirring blade 130 is provided to extend along the inclined axis 130a which is inclined at an acute angle with respect to the vertical axis 120a. In addition, each stirring blade 130 is twisted around the upper inclined shaft (130a) so that the leading edge (134a) is located lower than the trailing edge (134b).

On the other hand, in Figures 1 and 2, the two stirring blades 130 are shown spaced apart by 180 degrees. However, unlike this, three stirring blades 130 located apart at intervals of 120 degrees may be provided (not shown), or four stirring blades 130 located at intervals of 90 degrees may be provided (not shown).

In addition, unlike described above, the inner end 136a of the stirring vane 130 may be fixed to the outer surface of the rotating shaft 120 without using the boss 132 as a medium by welding or the like. However, the stirring blades 130 are already fixed boss 132 to the outer surface of the rotation shaft 120 than when the inner end 136a of each of the stirring blades 130 is directly fixed to the outer surface of the rotation shaft 120 . This makes fixing between the stirring blades 130 and the rotation shaft 120 more convenient, it is more advantageous to use the boss 132 for fixing between the stirring blades 130 and the rotation shaft 120 .

In the stirrer 100 as described above, the stirring material 10 is supplied to the inside of the stirring tank 110 in a state in which the rotating shaft 120 rotates, and then the stirring material 10 filling up in the stirring tank 110 . There comes a time when the area near the inner end 136a of the stirring blades 130 is locked as shown in FIG. 1 . And at this point, the stirring material 10 starts to rotate at a speed similar to the rotational speed of the stirring blades 130 by the area near the inner end 136a of the stirring blades 130, and from then on, the upper inner side The rest of the stirring blades 130 positioned on the outside of the stage near the stage 136a are immersed in the rotating stirring material 10 so as not to receive a sudden load.

Therefore, in the stirrer 100 according to the present invention, the site subjected to a sudden load by contacting the non-rotating stirring material 10 is always limited to the area near the inner end 136a of the stirring blades 130 and the stirring blades As it does not reach the rest of the outer portion of 130, there is no problem in which the conventional agitating blades in a horizontal state bend or the conventional agitating blades in a fixed rotational shaft bend.

On the other hand, the stirrer 100 according to the present invention also includes support members 140 for stably maintaining the inclined posture of the stirring blades 130 . The outer end of each support member 140 is fixed to the outer end 136b of the stirring blade 130 by welding or the like. And the inner end of each support member 140 is fixed to the rotation shaft 120, is fixed to be positioned higher than the inner end (136a) of the stirring blade (130).

In this case, the height of the inner end of the support member 140 may be variously set. For example, the height of the inner end of the support member 140 may be higher than the height of the outer end of the support member 140 as shown in FIG. 1 . Also, although not shown, the height of the inner end of the support member 140 may be the same as or lower than the height of the outer end of the support member 140 .

The inner end of the support member 140 may be fixed to the rotation shaft 120 via the boss 142 . In this case, the inner end of the support member 140 is fixed to the rotation shaft 120 by being welded to the rotation shaft 120 after the boss 142 is fitted to the rotation shaft 120 in a state previously welded to the boss 142 .

Alternatively, the inner end of the support member 140 may be directly fixed to the outer surface of the rotation shaft 120 without using the boss 142 as a medium by welding or the like. However, the case of using the boss 142 as above, rather than the case of directly fixing the inner end of each of the support members 140 to the outer surface of the rotation shaft 120, makes the fixing of the inner end of the support members 140 more convenient. It is better to use the boss 142 to fix the bar between the support members 140 and the rotation shaft 120 .

As described above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of the present invention and the following by those of ordinary skill in the art to which the present invention pertains. It goes without saying that various modifications and variations can be made within the equivalent scope of the claims to be described, and the above-described embodiments can be variously combined.

100: agitator with inclined stirring blades
110: stirred tank 120: rotating shaft
122: motor 130: stirring blades
132: boss 134a: leading edge
134b: trailing edge 136a: medial end
136b: outer end 140: support member
142: boss 10: stirring material

Claims (4)

It extends from the upper part of the stirred tank used as a stirring place to the inside of the stirred tank in a vertical posture, is provided rotatably about a vertical axis, and before the sludge and coagulant, which are stirred materials, are supplied to the inside of the stirred tank. a rotation shaft provided to start rotation; and
It has an inner end fixed to the rotating shaft and an outer end opposite to the inner end and is located inside the stirred tank, but is supplied to the inside of the stirred tank in a state in which the rotary shaft rotates and fills up from the bottom of the stirred tank A plurality of stirring blades positioned to be in contact with the stirring material first, arranged along the rotational direction of the rotational shaft, and having leading and trailing edges leading and trailing when the rotational shaft is rotated as two sides connecting the inner and outer ends including;
Each of the stirring blades is twisted so that the leading edge is positioned below the trailing edge, and the leading and trailing edges of all of the plurality of stirring blades are inclined so as to increase from the inner end to the outer end,
The upper and lower surfaces of each of the stirring blades are composed only of flat surfaces bordering the inner end, outer end, leading and trailing sides,
An outer end of a support member for stably maintaining the posture of the stirring blade is fixed to the outer end of each stirring blade, and the support member is an inner end fixed to the rotating shaft at a position higher than the inner end of the stirring blade. A stirrer having an inclined stirring blade that comes into contact with the stirring material already rotating by the stirring blades. According to claim 1,
The fixing between the inner end of the stirring blade and the rotating shaft is a stirrer having an inclined stirring blade formed by being fixed after the boss to which the inner end of the stirring blade is fixed is fitted to the rotation shaft. delete According to claim 1,
The fixing between the inner end of the support member and the rotation shaft is a stirrer having an inclined stirring blade formed by fixing the boss to which the inner end of the support member is fixed after being fitted to the rotation shaft.

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