WO2000063119A2

WO2000063119A2 - Equality velocity agitating type flocculator

Info

Publication number: WO2000063119A2
Application number: PCT/KR2000/000348
Authority: WO
Inventors: Hyo Yun Yu
Original assignee: Hyo Yun Yu
Priority date: 1999-04-15
Filing date: 2000-04-14
Publication date: 2000-10-26
Also published as: KR20000066334A; KR100298271B1; WO2000063119A3

Abstract

The present invention relates to an equality velocity agitating type flocculator used in a flocculating reservoir of a sedimentation basin for flocculating chemicals in a water supply. The equality velocity agitating type flocculator according to the present invention is capable of maximizing the flocculating effect by agitating and flocculating all water equally at the predetermined velocity, and can be installed or maintained easily and quickly without drain of the water in the flocculating reservoir by mounting agitating blades on a slave of the flocculating reservoir in the form of a swing such that the agitating blades arranged in the flocculating reservoir can be moved horizontally in the agitating reservoir.

Description

TITLE EQUALITY VELOCITY AGITATING TYPE FLOCCULATOR

TECHNICAL FIELD

The present invention relates to an equality velocity agitating type flocculator used in a flocculating reservoir of a sedimentation basin for flocculating chemicals in a water supply, and more particularly to an equality velocity agitating type flocculator which is capable of maximizing the flocculating effect by agitating and flocculating all water equally at the predetermined velocity and which can be installed or maintained easily and quickly by mounting agitating blades on a slave of the flocculating reservoir in the form of a swing such that the agitating blades arranged in the flocculating reservoir can be moved horizontally in the agitating reservoir .

BACKGROUND ART

Factors affecting flocculation in the sedimentation basin include water temperature, degree of turbidity, chemicals, intensity of agitation, etc. Generally, water temperature, degree of turbidity, and chemicals are adjusted before the flocculating reservoir, whereas intensity of agitation is adjusted in the flocculating reservoir.

In order to accomplish good flocculation, there is used a tapered flocculation process in which velocity for agitation and flocculation is gradually decreased from the front line to the rear line. In this process, it is important to agitate all the areas in the flocculating reservoir equally at the predetermined agitating velocity in the flocculating reservoir of each line.

Up to now, a paddle type flocculator including agitating blades which is rectangular in a cross section has been used widely. However, all agitating blades of this paddle type flocculator are arranged around a rotating shaft in parallel with the rotating shaft. Consequently, the agitating velocity of the blades far from the center of the rotating shaft is fast in proportion to the radius, whereas the agitating velocity of the blades close to the center of the rotating shaft is slow. That is to say, the agitating velocity may vary with the positions in the flocculating reservoir. As a result, good flocculation can not be expected due to discontinuity of the flow and unequal agitation. Also, the efficiency of flocculation is poor since the about 30% of the volume in the flocculating reservoir is not agitated directly. In addition, since the agitating blades and the rotating shaft of the flocculator are mounted fixedly to the structure in the water by means of a shaft bearing, it is required to drain the water in the flocculating reservoir prior to installation or maintenance of the flocculator. As a result, it may take a plenty of time to stop the operation of the sedimentation basin, to drain the water before the installation or repair of the sedimentation basin, then to fill the sedimentation basin with water after the installation or repair thereof, and also a plenty of water may be wasted.

DISCLOSURE OF THE INVENTION

It is an object of the present invention to provide an equality velocity agitating type flocculator which is capable of maximizing the flocculating effect by agitating and flocculating all water equally at the predetermined velocity and which can be installed or maintained easily and quickly by mounting agitating blades on a slave of the flocculating reservoir in the form of a swing such that the agitating blades arranged in the flocculating reservoir can be moved horizontally in the agitating reservoir.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other objects, aspects and embodiments of the present invention will be described in more detail with reference to the following drawings, in which:

Fig. 1 is a plan view showing that a main driving shaft and a supporting shaft for supporting agitating blades are arranged in parallel with each other and perpendicular to the direction of the flow of the water on a slave of each flocculating reservoir;

Fig. 2 is a cross-sectional view showing the construction of an equality velocity agitating type flocculator according to the present invention;

Fig. 3 is an enlarged view showing that a driving lever is attached to one end of the main driving shaft;

Fig. 4 is a front view showing that a cam follower at the lower end of the driving lever is inserted into the guide groove in the surface of a cylindrical cam;

Fig. 5 is a characteristic view showing the velocity of rotation for the cylindrical cam by which the driving lever is operated;

Fig. 6 is a cross-sectional view showing that the agitating blades are moved horizontally from side to side in the flocculating reservoir;

Fig. 7 is a front view showing that the agitating blades are moved horizontally to the left in the flocculating reservoir;

Fig. 8 is a front view showing that the agitating blades are moved horizontally to the right in the flocculating reservoir;

Fig. 9 is a view of another embodiment of the equality velocity agitating type flocculator according to the present invention showing that angle of the agitating blades arranged in flocculating reservoirs varies with each of the flocculating reservoirs, so that the velocity of the water flowing in each of the flocculating reservoirs is gradually decreased in order to obtain G value necessary for each of the flocculating reservoirs;

Fig. 10 is a plan view of another embodiment of the equality velocity agitating type flocculator according to the present invention showing that the agitating blades are moved horizontally under the guidance of a guiding support beam in the flocculating reservoir;

Fig. 11 is a cross-sectional view of another embodiment of the equality velocity agitating type flocculator according to the present invention showing that the agitating blades are moved horizontally by means of a sliding member in the flocculating reservoir;

Fig. 12 is a perspective view showing that the sliding member is lifted;

Fig. 13 is a cross-sectional view showing that the agitating blades are moved horizontally by means of the sliding member;

Fig. 14 is a cross-sectional view of another embodiment of the equality velocity agitating type flocculator according to the present invention showing that the agitating blades are moved by means of a wire rope in the flocculating reservoir; Fig. 15 is a cross-sectional view showing that a movable bogie is connected to a main support beam of I type; and

Fig. 16 is a plan view showing that the driving winch, the main support beam and the movable bogie are mounted on the slave of the flocculating reservoir.

BEST MODE FOR CARRYING OUT THE INVENTION

Flocculating reservoirs are composed of a plurality of unit flocculating reservoirs A, B, C, . . . , N, which are rectangular in cross section and arranged with one another from side to side, and each of which is formed by partitions P built vertically and rectification wall W having a water surface of the water tank.

On slaves S formed at the upper ends of each of the partitions P are mounted a main driving shaft 1, a slave driving shaft 2, and a supporting shaft 3 for supporting swingingly a agitating blade 5a in parallel with one another and perpendicular to the direction of the flow of the water in each of the unit flocculating reservoirs A, B, C, . . . , N. A mount 4 for a driving device is fixed by means of a anchor bolt 4a on the slave in which one ends of the main driving shaft 1 and the supporting shaft 3 for supporting the agitating blade are located. On the mount 4 for the driving device is mounted a cylindrical cam 6 perpendicular to the main driving shaft 1. The cylindrical cam 6 is supported at both ends by means of bearing units 7 for journaling the shaft of the cam. The bearing units 7 for journaling the shaft of the cam is fixed to the mount 4 for the driving device by means of fixing screws 8.

The cylindrical cam 6 is connected at one end to a transmission retarder 10 via a shaft coupling unit 9.

The main driving shaft 1 and the slave driving shafts 2 are mounted with respect to the flocculating reservoirs respectively, which are arranged across the midway of each flocculating reservoir, horizontally and perpendicular to the direction of the flow of the water such that they are located at an appropriate level over the slaves S. The main driving shaft 1 and each of the slave driving shafts 2 are supported at both ends by means of bearing units 11. The bearing units 11 are mounted on the middle mount 12, which is fixed on the slaves S between each of the flocculating reservoirs, by means of fixing bolts 11a. Between the main driving shaft 1 and the slave driving shaft 2 in the each of the flocculating reservoirs is connected a retractable shaft coupling unit 13, by which the main driving shaft 1 and the slave driving shaft 2 are rotated in unison.

The main driving shaft 1 is extended at one end located at the cylindrical cam through the bearing unit 11. To one end of the main driving shaft 1 is attached integrally and rotatably a driving lever 14. A cam follower 15 is inserted at the lower part of the driving lever 14 and secured fixedly by means of a fixing nut 16. The cam follower 15 follows rotatably the guiding groove 6a in the cylindrical cam 6.

To the main driving shaft 1 and the slave driving shafts 2 are mounted the upper ends of two driving arms 17 and 18, which are arranged at regular intervals. The lower ends of the driving arms are connected rotatably to hinge pins 21 and 21a of a supporting member 20 for supporting the agitating blade fixed to a fixing member 19 for fixing the agitating blade. The upper portions of two supporting links

22 and 23 for supporting the agitating blade are provided rotatably at the supporting shaft 3 for supporting the agitating blade, whereas the lower portions of the supporting links 22 and 23 for supporting the agitating blade are connected pivotably to the hinge pins 24 and 24a of the supporting member 20 for supporting the agitating blade fixed to the fixing member 19 for fixing the agitating blade. Therefore, the driving arms 17 and 18 and the supporting links 22 and 23 for supporting the agitating blade arranged between the main driving shaft 1, the supporting shaft 3 for supporting the agitating blade and the hinge pins 21, 21a, 24 and 24a of the supporting member

20 for supporting the agitating blade are moved on the line of the parallelogram, as seen from the side.

The operation of the equality velocity agitating type flocculator according to the present invention will now be described.

When the cylindrical cam 6 is rotated as the transmission retarder 10 is rotated, the cam follower 15 inserted into the guiding groove 6a formed in the surface of the cylindrical cam 6 is moved along the guiding groove 6a. As a result, when the cylindrical cam 6 is rotated one cycle, the driving lever 14 is moved at a uniform velocity from the left to the right and returned to the original position. It should be noted that in order to produce the movement from the side to side, the cam mechanism is used instead of the common motor, because the motor may be damaged due to the overheat if the forward and backward movement, starting and stopping are repeated in a short cycle .

This uniform velocity from side to side is transmitted to the driving arms 17 and 18 via the main driving shaft 1. The rotation of the driving arms 17 and 18 results in the rotation of the supporting links 22 and 23 for supporting the agitating blade connected to the supporting member 20 for supporting the agitating blade. As a result, the grid type agitating blade 10 is moved from side to side. At this time, since the driving arms 17 and 18 and the supporting links 22 and 23 for supporting the agitating blade forms a parallelogrammic link mechanism and since the relative position between the main driving shaft 1 and the supporting shaft 3 for supporting the agitating blade which are at the upper part of the parallelogrammic link mechanism are not changed, i.e., maintained horizontally, the supporting member 20 for supporting the agitating blade which is at the other part of the parallelogrammic link mechanism is also moved from side to side horizontally. As a result, the agitating blades 5 and 5a and the agitating blade portions attached to the supporting member 20 for supporting the agitating blade at a right angle thereto are moved from side to side in the original vertical arrangement.

When the position C of the hinge pins 21, 21a, 24 and 24a is moved toward the position Cl(->) or the position C2 (<-) , the position d of the hinge pins 21, 21a, 24 and 24a is moved toward the position dl(->) or the position d2 (<-) . Consequently, the driving arms 17 and 18 and the supporting links 22 and 23 for supporting the agitating blade are moved in a circular arc. Although the angle of inclination of the driving arms 17 and 18 and the supporting links 22 and 23 for supporting the agitating blade is changed depending on the position of the movement in the circular ate, the supporting member 20 for supporting the agitating blade are always moved at the same level due to the characteristic of the parallelogrammic link mechanism, and therefore the upper ends a and b of the agitating blades 5 and 5a and the lower ends e and f of the agitating blades 5 and 5a are always moved vertically. Consequently, the moving velocity of the supporting member 20 for supporting the agitating blade is the same as that of the upper part and lower part of the agitating blades regardless of the construction that the radius from the main driving shaft 1 and the supporting shaft 3 for supporting the agitating blade is short at the upper ends a and b, and long at the lower ends e and f . Also, since the angel of the movement from side to side is small, e.g. approximately 20° , the change of the velocity in the horizontal direction is negligibly small, and thus it is considered to be uniform velocity.

Accordingly, the agitation can be carried out at a equal velocity at all area in the flocculating reservoir, whereby it is possible to maximize the flocculating effect .

Furthermore, no mechanical equipments are installed to the structure in the water of the flocculating reservoir, all the mechanical equipments are installed on or removed from the slave S of the flocculating reservoir, and the mechanical equipments are arranged separately in each of the flocculating reservoirs. As a result, it is not necessary to drain the water in the flocculating reservoir or cut off the water supply during installation, removal or maintenance. Consequently, The installation or maintenance operation can be carried out quickly and easily.

Fig. 9 is a view of another embodiment of the equality velocity agitating type flocculator according to the present invention. As shown in the drawing, the main driving shaft 1 is along the direction of the flow of the water in each of the flocculating reservoirs such that the angle of the blade 25a of the agitating blade portion 25 arranged in the flocculating reservoir in the first line A' is in parallel with the direction of the main driving shaft 1 (which is the same as the direction of the flow of the water) , the angle of the blade 26a of the agitating blade portion 26 arranged in the flocculating reservoir in the second line B' is inclined at approximately 40° - 50° with respect to the direction of the main driving shaft 1 (which is the same as the direction of the flow of the water) , and the angle of the blade 27a of the agitating blade portion 27 arranged in the flocculating reservoir in the third line C is inclined at approximately 60° - 70° with respect to the direction of the main driving shaft 1 (which is the same as the direction of the flow of the water) . As a result, the velocity of the flow of the water in the flocculating reservoir in the first line A' is high, and the velocity of the flow of the water in the flocculating reservoirs in the second line B' and the third line C is gradually decreased respectively, whereby it is possible to adjust G values necessary for each of the flocculating reservoirs.

In this embodiment, the direction of movement of the agitating blades is at right angle to the direction of the flow of the water. Accordingly, the occurrence of discontinuity of the flow due to the agitation is minimized.

Fig. 10 is a plan view of another embodiment of the equality velocity agitating type flocculator according to the present invention showing that the agitating blades are moved horizontally. As shown in the drawing, two guiding support beams 28 and 28a are mounted horizontally in parallel with each other on the salve S of the flocculating reservoir. From the supporting member 20 for supporting the agitating blade are extended upwardly two auxiliary supporting members 29 and 29a for supporting the agitating blades, the upper ends of which are connected rotatably to guide rollers 30 and 30a inserted in the grooves of the guiding support beams 28 and 28a by means of roller shaft pins 31 and 31a. The lower ends of the auxiliary supporting members 29 and 29a for supporting the agitating blades are fixed integrally to the supporting member 20 for supporting the agitating blade. The driving arm 32 is arranged in the middle of the main driving shaft 1. The driving arm 32 is connected integrally at the upper end thereof to the main driving shaft 1. The driving arm 32 is connected rotatably to the shaft of the sliding member 34a which passes through the center of the sliding member 34a adapted to slide freely in the guiding groove 33 formed integrally in the supporting member 20 for supporting the agitating blade. When the driving arm 32 is moved from side to side by the rotation angle Q as the main driving shaft 1 is rotated, the sliding member 34 mounted slidingly to the supporting member 20 for supporting the agitating blade is moved from side to side at the same velocity as that of the lower part of the driving arm 32. At the same time, the supporting member 20 for supporting the agitating blade and the grid type agitating blades 5 and 5a attached integrally thereto are moved from side to side at the same velocity together. As a result, the auxiliary supporting members 29 and 29a for supporting the agitating blades act to maintain the horizontal level suspending the fixing member 19 for fixing the agitating blade, the agitating blades 5 and 5a, and the agitating blade portions. Also, when the driving arm 32 is moved from side to side, the position of the supporting member 20 for supporting the agitating blade is changed from side to side on the horizontal line. Consequently, the difference between the upper and lower positions caused by the movement of the sliding member 34 upwardly or downwardly in the guiding groove 33, and thus the movement of the driving arm 32 in a circular arc is absorbed. Fig. 14 is a cross-sectional view of another embodiment of the equality velocity agitating type flocculator according to the present invention showing that the agitating blades are moved by means of a wire rope in the flocculating reservoir . As shown in the drawing, a main support beam 36 of section steel having a cross section of I type is arranged horizontally at the right angle to the direction of the flow of the water in the middle of the width of the flocculating reservoir on the salve S of the flocculating reservoir, and fixed securely to the middle mount 37 by means of a fixing screw 38. A plurality of guiding wheels (in this case, two wheels at left and right sides respectively) are arranged in the guiding line 35 of the main support beam 36. A bracket 40 for fixing the wheels is secured integrally to a movable bogie 41, to the central lower end of which is fixed integrally a driving arm 42. The lower end of the driving arm 42 is attached integrally and vertically to the middle portion of the supporting member 20 for supporting the agitating blade.

To one end of the main support beam 36 above the slave S of the flocculating reservoir is mounted vertically a cylindrical driving winch 44. To the other end of the main support beam 36 is mounted a rope guiding wheel 45. A rope 46 is guided through the rope guiding wheel 45. The cylindrical driving winch 44 is fixed securely to a mount 43 for the driving device by means of the rotatable bearing unit 44a, and connected to a transmission retarder 48 via a shaft coupling unit 47. The motor of the transmission retarder 48 may be a stepping motor, for example, which is suitable to carry out forward or backward rotation, start, and stop frequently.

On the driving winch 44 is wound the driving wire rope 46, ends of which are fixed such that they are not unfastened or slipped.

One end of the driving wire rope 46 is wound on the driving winch 44. The the other end of the driving wire rope 46 is wound on the rope guiding wheel 45 opposite to the driving winch 44 via the main support beam 36, and secured to the end of the movable bogie 41. Between the movable bogies 41 is connected a connecting wire rope 46a. The other end of the driving wire rope 46 is fixed to the first movable bogie 41 at the winch side so as to form a closed loop.

A plurality of rope guiding rollers 47 are arranged at regular intervals in the main support beam 36, so as to prevent the driving wire rope 46 from drooping and moving in the horizontal direction.

A plurality of main support beams 36 are installed in a plurality of flocculating reservoirs such that each of the flocculating reservoir has a corresponding one of the main support beams 36, and such that the main support beams are connected with each other successively and detachably.

When the transmission retarder 48 repeats to rotate forwardly and backwardly at uniform velocity and at uniform cycles, the driving winch 44 rotates forwardly and backwardly. As a result, the movable bogies 41 of each of the flocculating reservoirs connected with each other by means of the driving wire rope 46 is also moved horizontally from side to side at uniform velocity and at uniform cycles, and subsequently the agitating blades 5 and 5a attached integrally to the movable bogies 41 and the agitating blade portions are moved horizontally from side to side at uniform velocity, so that all the areas in the flocculating reservoir are agitated equally at the uniform, and therefore the flocculating effect is maximized.

In addition, the main support beams 36 are used separately in each of the flocculating reservoirs, and the connecting wire ropes 46a are also used separately in each of the flocculating reservoirs. Consequently, it is possible to install the agitating blades 5 and 5a without any mechanical equipments being secured to the structure in the water of the flocculating reservoir .

INDUSTRIAL APPLICABILITY

According to the present invention, it is possible to maximize the flocculating effect of the water by moving the agitating blades horizontally with respect to the water in the flocculating reservoir and then agitating all water in the flocculating reservoir equally at the uniform velocity. Also, the agitating blades installed in the flocculating reservoir is not attached to any stationary structure in the flocculating reservoir, but attached to the lower end of the driving arm provided at the main driving shaft by means of the hinge pin of the supporting member for supporting the agitating blade over the slave of the flocculating reservoir. As a result, the installation or maintenance of the agitating blades can be made outside the slave of the flocculating reservoir, and therefore it is not necessary to drain the water in the flocculating reservoir or cut off the water supply during installation, removal or maintenance. Consequently, the installation or maintenance operation can be carried out quickly and easily.

While preferred embodiments have been described, variations thereto will occur to those skilled in the art within the scope of the present inventive concepts which are delineated by the following claims.

Claims

WHAT IS CLAIMED IS:

1. An equality velocity agitating type flocculator used in a flocculating reservoir which is rectangular in cross section and which is formed by partitions (P) and rectification walls (W) , comprising: two sets of agitating blades for the flocculator provided symmetrically at the middle of the flocculating reservoir, said agitating blades being perpendicular to the direction of the flow of the water in the flocculating reservoir; means for moving the agitating blades from side to side at uniform velocity; and a fixing unit secured detachably to a slave (S) of each of the flocculating reservoirs for fixing said means.

2. The equality velocity agitating type flocculator according to claim 1, wherein a main driving shaft (1) , each of slave driving shafts (2) , and a supporting shaft (3) for supporting the agitating blades are provided horizontally at regular intervals, in parallel with one another, and perpendicular to the direction of the flow of the water in the middle of the flocculating reservoir, said main driving shaft (1) , each of said slave driving shafts (2) , and said supporting shaft (3) for supporting the agitating blades being supported by means of supporting bearing units (11) on the slave (S) at the upper end of the flocculating reservoir, said main driving shaft (1) being rotated from side to side through the connection with a cylindrical cam (6) by a driving lever (14) connected to one end of main driving shaft, wherein the upper ends of two driving arms (17) (18) are mounted at regular intervals to the main driving shaft (1) and said slave driving shafts (2) respectively, and the lower ends of the two driving arms (17) (18) are connected rotatably to hinge pins (21) (21a) of a supporting member (20) for supporting the agitating blade which is arranged horizontally in the water of each of the flocculating reservoirs, and wherein the upper portions of two supporting links (22) (23) for supporting the agitating blade are provided at the supporting shaft (3) for supporting the agitating blade, and the lower portions of the supporting links (22) (23) for supporting the agitating blade are connected to hinge pins (24) (24a) of the supporting member (20) for supporting the agitating blade such that the main driving shaft (1) , the supporting shaft (3) for supporting the agitating blade, the driving arms (17) (18) , the supporting links 22 and 23 for supporting the agitating blade, and the supporting member (20) for supporting the agitating blade form a parallelogrammic link mechanism, as seen from the direction of the main driving shaft, whereby the agitating blades (5) (5a) are moved horizontally by means of the rotation of the main driving shaft (1) from side to side, to agitate and flocculate all water in each of the flocculating reservoirs at uniform velocity.

3. The equality velocity agitating type flocculator according to claim 2, wherein the upper end of the driving lever (14) is attached integrally to one end of the main driving shaft 1 at the cylindrical cam (6) , and at the lower end of the driving lever (14) is provided a cam follower (15) , said cam follower (15) being inserted into a guiding groove (6a) of the cylindrical cam (6) , and wherein the cylindrical cam (6) is rotated by means of a transmission retarder 10.

4. The equality velocity agitating type flocculator according to claim 2, wherein the angle of agitating blade portions (25) (26) (27) of the agitating blades (5) (5a) connected perpendicular to the main driving shaft (1) , each of the slave driving shafts (2) , and the supporting shaft (3) for supporting the agitating blades is adjusted such that the angle (25a) of the agitating blade portion (25) arranged in the flocculating reservoir in the first line is in parallel with the direction of the flow of the water, the angle (26a) of the agitating blade portion (26) arranged in the flocculating reservoir in the second line is inclined at 40° - 50° with respect to the direction of the flow of the water, and the angle (27a) of the agitating blade portion

(27) arranged in the flocculating reservoir in the third line is inclined at 60° - 70° with respect to the direction of the flow of the water, whereby the velocity of the flow of the water in the flocculating reservoir in the first line (A' ) is high, and the velocity of the flow of the water in the flocculating reservoirs in the second line (B')and the third line (C) is gradually decreased respectively, to adjust G values necessary for each of the flocculating reservoirs.

5. The equality velocity agitating type flocculator according to claim 2, wherein the agitating blades (5) (5a) are moved horizontally under the guidance of two support beams (36) of I type in which upper rollers (30) (30a) of auxiliary supporting members 29 and 29a for supporting the agitating blades fixed at regular intervals to both sides of the supporting member (20) for supporting the agitating blade are arranged in parallel with each other in the direction of the flow of the water of each of the flocculating reservoirs .

6. The equality velocity agitating type flocculator according to claim 2, wherein the agitating blades (5) (5a) are fixed to a supporting member (43) for supporting the agitating blade which is fixed securely to the lower end of a driving arm (42) connected to a movable bogie (41) , and wherein the movable bogie (41) , of which guiding wheels (39) are inserted into guiding lines (35) at both sides of a main support beam (36) arranged perpendicular to the direction of the flow of the water in the middle of the flocculating reservoir, is moved from side to side at uniform velocity by means of a wire rope (46) wound on a driving winch (44) .