JP4875028B2 - Horizontal flocculator - Google Patents

Description

  The present invention relates to a horizontal flocculator installed for performing a coagulation sedimentation operation in a flock formation pond or the like such as a water purification plant.

  In general, in a water purification plant, solid suspended solids are removed before the treatment. For this purpose, long rectangular floc formation ponds are installed in parallel, horizontal flocculators are installed in each formation pond, and a coagulation sedimentation operation is performed in combination with the addition of chemicals. The horizontal flocculator is to install a stirring blade frame with a plurality of horizontally extending stirring blades around the horizontal axis along the longitudinal direction of the flock formation pond, and rotate at a relatively low speed around the axis. The stirring blade frame is rotationally driven by a driving device (motor) installed outside one end of the flock formation pond.

In the conventional stirring blade frame, for example, as shown in FIG. 1 of Patent Document 1, rod-like members extending radially from an axial body extending along the axis are arranged at intervals in the axial direction. A stirrer blade is attached to point. The shaft body is supported by a bearing at the end, and the driving force from the driving device is transmitted. In such processing, it is advantageous in terms of processing efficiency to form a long flock-forming pond and install a horizontal flocculator having a length approximately the same as the length of the pond in the pond. Therefore, the stirring blade frame is often quite long. In this case, in order to prevent the shaft body from being bent, as shown in FIG. It is supported by an intermediate bearing provided in the water.
JP 2002-336669 A

  However, in the conventional technology as described above, the intermediate bearing is installed on a stand that is erected on the bottom of the pond. Therefore, the stirring blade is divided at a place where the intermediate bearing is installed. Accordingly, the efficiency of the agitation treatment is lowered at this portion, and the aggregated precipitate is likely to stay in this portion, and the frequency of maintenance such as cleaning is increased.

  In addition, if there is a deviation in the axis of rotation of the stirring blade frame, the power load increases and the amount of wear of the bearing also increases, so the shaft body needs to be centered with high accuracy, and it is very difficult to install underwater bearings. Time and effort are required. In particular, when the length of the flock formation pond is long, the number of underwater bearings increases, which requires a great amount of time and labor for construction. Furthermore, the oilless metal for underwater bearings is a consumable part that requires periodic replacement, which involves jacking up the shaft, etc., which requires a lot of maintenance work.

  Furthermore, the intermediate shaft, which is the shaft body part corresponding to the intermediate bearing, is a machined part that is separate from the shaft body of the agitating blade frame. It takes time and money to produce. In addition, it is necessary to periodically spray, repair plating, replace sleeves, etc., and loss due to operation stop, and labor and cost for repair are significant. Centering of the agitator blade frame shaft and intermediate shaft Therefore, both ends of the shaft body must be machined, which takes time and money to manufacture.

  Furthermore, in order to absorb the distortion of the water treatment tank due to earthquakes, etc., an underwater flexible shaft coupling may be provided, but sufficient strength is required to transmit large agitation power, the weight is large, and installation and maintenance management is required. Takes time and effort. In addition, in order to attach the underwater flexible shaft joint, it is necessary to support both sides of the underwater flexible shaft joint with the underwater bearing, so that there is a problem that the number of intermediate shafts and underwater bearings increases.

  The present invention has been made in view of the above circumstances, and even with a long apparatus, the stirring blades are not divided, and while maintaining high stirring treatment efficiency over the entire area of the flock formation pond, The purpose of the present invention is to provide a horizontal flocculator that can reduce maintenance due to the accumulation of aggregated precipitates, and further reduce the costs associated with centering long shafts and installing and maintaining bearings in water. And

  In order to achieve the above object, the invention according to claim 1 is a horizontal flocculator installed in a water treatment tank, wherein a drive device disposed outside the water treatment tank, and in the water treatment tank An agitating blade frame arranged, having a horizontal axis and having one or a plurality of agitating blades extending in parallel to the axial direction, and transmitting the driving force of the driving device to the agitating blade frame And a support structure that rotatably supports the agitator blade frame so as to be rotatable about the axis, and the support structure is located at a portion excluding both ends of the agitator blade frame. The stirring blade frame is supported only on the outer peripheral portion of the stirring blade frame.

  Here, “in the place excluding both ends of the stirring blade frame, the stirring blade frame is supported only on the outer periphery of the stirring blade frame” means that the both ends of the stirring blade frame are supported on the outer periphery. This also means that it is supported or not supported at a location that is not the outer peripheral portion, that is, close to the central axis, but it is supported only at the outer peripheral portion at a location other than the end portion. Further, the "outer peripheral part" means "outside the outermost stirring blade attached to the stirring blade frame", and is intended to support at a position that does not interfere even if the stirring blades are continuously attached. It is.

  In the first aspect of the present invention, since the support structure is located outside the rotation trajectory of the stirring blade frame, it is not necessary to divide the stirring blade there as in the case where the intermediate shaft is supported by a bearing as in the prior art. Accordingly, the efficiency of the stirring treatment is improved, and the staying of the aggregated precipitate is prevented, so that an efficient treatment can be performed. In addition, since it is not necessary to dispose a bearing that requires high centering accuracy in the water, manufacturing costs and work costs such as installation and maintenance are greatly reduced.

The invention according to claim 2 is the horizontal flocculator according to claim 1, wherein the support structure includes a plurality of rollers installed in one of the stirring blade frame and the water treatment tank, and the other of these rollers. And a guide member having a sliding contact surface that comes into contact with the roller.
In the second aspect of the invention, the plurality of rollers are slidably brought into contact with the sliding contact surface of the guide member, so that the agitating blade frame is supported stably and with high reliability even under water.

According to a third aspect of the present invention, in the horizontal flocculator according to the second aspect, the roller is provided in the stirring blade frame, and the guide member is provided in the water treatment tank.
In the invention described in claim 3, since the relatively heavy guide member is provided in the water treatment tank, the mass on the rotating stirring blade frame side is reduced, and the energy efficiency is improved.

According to a fourth aspect of the present invention, in the horizontal flocculator according to the third aspect of the present invention, the guide member has a semicircular or arc shape with a central angle of less than that.
In the invention described in claim 4, by making the guide member into a circular arc shape of a part of the circle, it is possible to save materials, reduce the contact time of the roller, or facilitate maintenance.

According to a fifth aspect of the present invention, in the horizontal flocculator according to the second aspect, the roller is provided in the water treatment tank, and the guide member is provided in the stirring blade frame.
In the invention described in claim 5, since a roller having a large diameter can be adopted, a stable and energy efficient support structure can be obtained. Note that “in the water treatment tank” means “on the water treatment tank side”, and it is not always necessary to provide the roller in the tank or in the water. Further, although the guide member has an arc surface along the rotation locus of the roller, there are cases where the roller slidably contacts the inner peripheral surface as well as the outer peripheral surface of the guide member.

A sixth aspect of the present invention is the horizontal flocculator according to any one of the first to fifth aspects, further comprising a reinforcing member disposed obliquely so as to supplement the torsional strength of the stirring blade frame. It is characterized by.
In the invention described in claim 6, the reinforcing members arranged obliquely supplement the strength of the stirring blade frame in the torsional direction, thereby preventing torsional deformation and improving stable operation and durability.

According to a seventh aspect of the present invention, in the horizontal flocculator according to any one of the first to sixth aspects, the stirring blade frame is provided with a float that imparts buoyancy to the stirring blade frame. Features.
In the seventh aspect of the invention, the buoyancy acting on the float cancels the weight of the stirring blade frame and reduces the load on the driving device, whereby energy efficient processing is performed. Of course, it is possible to reduce the weight by, for example, hollowing the constituent members of the stirring blade frame.

  According to invention of Claim 1 thru | or 7, by installing a stirring blade continuously over the full length, the residence area | region without a flow is excluded, and an equal process is carried out in the whole region of a water treatment tank. This improves the efficiency of the agitation treatment and can prevent the aggregation precipitates from staying. In addition, since it is not necessary to dispose a bearing that requires high centering accuracy in the water, manufacturing costs and work costs such as installation and maintenance are greatly reduced.

  Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a horizontal flocculator according to an embodiment of the present invention, which is installed in a long rectangular water treatment tank 10 made of concrete. This horizontal flocculator is provided in the water treatment tank 10 with the horizontal axis parallel to the longitudinal direction of the water treatment tank 10 and the water treatment tank 10 and rotates the stirring blade frame 12 around this axis. A support structure 14 that is rotatably supported, a driving device 16 disposed outside one end of the water treatment tank 10, and a driving force of the driving device 16 from one end side of the stirring blade frame 12 to the stirring blade frame And a driving force transmission portion 18 that transmits to the motor 12.

  FIG. 3 shows a part (unit) of the stirring blade frame 12, and as shown in FIG. 4, a frame portion 24 configured by connecting ends of the cross-shaped frame member 20 with reinforcing members 22, and It is composed of a plurality of plate-like stirring blades 26 attached so as to be handed over between the frame members 20. Usually, the frame portion 24 is made of a suitable steel material, and the stirring blade 26 is made of resin or metal. In order to reduce the driving load by giving buoyancy to the frame portion 24, the member may be hollow. Further, a crosspiece member 28 that connects the stirring blades 26 or connects the stirring blades 26 and the reinforcing member 22 is provided.

  The unit of the stirring blade frame 12 composed of the pair of frame members 20 shown in FIG. 3 is substantially the same length as the stirring blade 26, and the reinforcing member 22, the stirring blade 26 and another frame member 20 are attached thereto. Thus, the units can be sequentially added to a length suitable for the water treatment tank 10. The example of FIG. 1 connects three units. Of course, the length can be adjusted by appropriately cutting the reinforcing member 22 and the stirring blade 26 added at the final stage. The stirring blade frame 12 produced in this way is arranged so that the stirring blades 26 pass between the frame members 20, and is continuous over the entire length of the stirring blade frame 12.

  The length of each unit is determined in consideration of not only the length of the stirring blade 26 to be used but also the strength. In particular, since a large torsional stress acts on the long agitating blade frame 12 due to the rotational moment, it is preferable to increase the strength by reinforcing the frame member 20 by adding the units without making the units themselves long. It is advantageous. As long as the stirring blade frame 12 has a structure that rotates around the horizontal axis while supporting a plurality of stirring blades 26, the structure and materials of each part, the number of stirring blades 26, and the like are appropriate. If the strength is ensured, it is not necessary to provide the reinforcing member 22 as a separate member from the stirring blade 26. For example, as shown in FIG. 5, in order to prevent deformation due to torsional stress, a skew reinforcing member 30 that connects adjacent frame members 20 with a phase shifted by 90 degrees may be provided. In addition to a rigid body such as a steel material, the skew reinforcing member 30 may be a member capable of applying a tensile force such as a wire.

  Rollers 32 are installed at the outer ends of the respective frame members 20 of the stirring blade frame 12. On the other hand, the stirring blade frame 12 is slidably brought into contact with these rollers 32 at corresponding portions of the water treatment tank 10. An annular guide rail (guide member) 34 that is rotatably supported is provided. The roller 32 and the guide rail 34 constitute the support structure 14 that supports the stirring blade frame 12 at the outer peripheral portion outside the stirring blade. For the roller 32 and the guide rail 34, a sliding-resistant member made of resin, ceramics, or metal is suitable. For example, if a flexible material is used for the roller 32, it is possible to absorb a change due to a change over time or an earthquake. For the convenience of taking out the stirring blade frame 12 at the time of maintenance, the guide rail 34 may be, for example, a vertically divided type. Note that the support structures 14 including the rollers 32 and the guide rails 34 do not have to be provided in all the frame members 20, and may be installed in a number that can stably support the stirring blade frame 12.

  A drive shaft 36 of the drive device 16 is attached to the frame member 20 on one end side of the stirring blade frame 12. The drive shaft 36 passes through an opening with a water seal device 38 provided on the wall of the water treatment tank 10 and is supported by a drive bearing 40. In this embodiment, a support shaft 42 protrudes from the frame member 20 on the other end (free end) side of the stirring blade frame 12 and is supported by a bearing 44 provided on the wall surface of the water treatment tank 10. . In addition, as shown in FIG. 6, the bearing 44 on the other end side of this embodiment employs a rolling bearing using a rolling element (roller) 46 made of resin, and absorbs a slight shift of the shaft core. Can be done.

  In the horizontal flocculator configured as described above, the water to be treated flows in from the horizontal direction of the horizontal flocculator and flows out to the opposite side (for example, flows from the front side to the back side in FIG. 1). The agitating blade frame 12 is supported by bearings at the drive shaft 36 and the support shaft 42 at both ends thereof, and is supported at the positions of the frame members 20 at the outer peripheral portion of the agitating blade frame 12 at other locations. It is supported by the structure 14. The stirring blade frame 12 is rotated at a predetermined speed by the driving device 16, and the stirring blade 26 extending over the entire length efficiently stirs the water to be treated without unevenness and performs agglomeration treatment. Since the agitating blade 26 is not divided as in the prior art, the flow is stagnated and aggregates do not stay, and the load of maintenance for that purpose is reduced. In the maintenance of the stirring blade frame 12 itself, the division guide rail 34 can be opened and taken out.

  In this horizontal flocculator, the stirring blade frame 12 is supported on the outer peripheral portion thereof, and therefore, for example, even when the axis is displaced due to a change over time, an earthquake, or the like, a plurality of loads are applied to the support structure 14. The stirring blade frame 12 itself is elastically deformed to some extent as a whole and absorbs the deviation, so that the operation is hardly hindered. Similarly, the assembly and installation of the agitating blade frame 12 is less demanding for centering accuracy and is easier than the case of support by a bearing, which reduces manufacturing and work costs and shortens work time. An effect is obtained. In this embodiment, the bearings are provided on both ends of the stirring blade frame 12, but the bearing on the free end may be omitted as in the embodiments described later.

  FIG. 7 is a modification of the embodiment of FIG. 1, in which the guide rail 34 </ b> A is composed only of a lower semicircular portion. In this example, as shown in FIG. 6A, when one frame member 20 is horizontal, three rollers 32 are provided, and in the other case shown in FIG. Sufficiently stable support can be obtained by contacting the rail 34A. In this embodiment, the stirring blade frame 12 can be easily installed and removed, and the manufacturing cost of the guide rail 34A can be reduced. Further, since the time for which the roller 32 is in sliding contact is also halved, the life of the roller 32 is extended. Since it is sufficient that two rollers 32 are always in contact with the guide rail 34 </ b> A, the guide rail 34 </ b> A may have a central angle that is twice the angle between the frame members 20.

  8 to 10 show a horizontal flocculator according to another embodiment of the present invention. Here, the guide rail 34B of the support structure 14 is on the stirring blade frame 12 side, and the roller 32B is on the water treatment tank 10. It is provided on each side. In this example, two rollers 32 </ b> B are provided on the bottom surface of the water treatment tank 10, and two rollers 32 </ b> B are provided on the side walls so as to be symmetrical. The guide rail 34B has a complete circular ring shape. If there are two rollers 32B at the bottom of the tank, it is possible to support the load. In some cases, it may be sufficient, but if the roller 32B is disposed above the axis as shown in FIG. 12 can be suppressed from above to prevent rattling. In this embodiment, the guide rail 34B plays the role of a reinforcing member and contributes to the improvement of the strength of the stirring blade frame 12. Therefore, in this figure, the skew reinforcing member 30 is not provided, but may be provided. Further, a float 48 is provided on the central axis to reduce the load on the support structure 14 by applying buoyancy.

  Also in this embodiment, as in the previous embodiment, the stirring blade frame 12 is supported by the support structure 14 at the outer peripheral portion of the stirring blade frame 12 at a portion other than the drive shaft 36 at the end. Therefore, the agitating blade 26 is processed without any unevenness over the entire area of the water treatment tank 10 without being divided. Further, since the bearings are not supported except for the drive side, the operation cost for manufacturing and installation is reduced. Since the roller 32B is installed on the tank side, the large-diameter roller 32B can be employed, and the efficiency can be increased and the reliability can be improved by reducing friction.

  In this embodiment, no bearing is provided on the free end side, and the bearing only supports the drive shaft 36. Accordingly, the free end side is supported only by the outer peripheral portion of the stirring blade frame 12, and the centering accuracy is further eased. The drive shaft 36 from the drive device 16 is connected to a disk-shaped drive force transmission plate 50, and the drive force transmission plate 50 has a movable coupling portion 52 as shown in FIG. 11 on the frame member 20 of the stirring blade frame 12. Are connected through. The movable coupling portion 52 is coupled with a cushioning material 58 having flexibility between the protrusion 54 on the driving force transmission plate 50 side and the concave portion 56 on the frame member 20 side, and the displacement is caused by elastic deformation of the cushioning material 58. Absorb.

  FIG. 12 shows an example in which the support structure 14 uses a roller 32C that is in sliding contact with the inner peripheral surface of the guide rail 34B. That is, at the bottom of the water treatment tank 10, a roller 32B in contact with the outer peripheral surface of the guide rail 34B and a roller 32C in contact with the inner peripheral surface are installed, the former supporting the load and the latter being suppressed from above. The roller 32C projects from the support fitting 60 installed at the bottom of the tank toward the guide rail 34B. In this example, the arrangement of the rollers 32B and 32CC can be limited to the bottom as compared with the example of FIG. In addition, when using the roller 32C in contact with the inner peripheral surface, it is necessary to prevent the reinforcement member 22 and the stirring blade 26 from interfering with each other. If the frame member 20 and the guide rail 34B are enlarged, the stirring blade 26 need not be reduced.

  In the example of FIG. 13, a support member 61 is installed on the upper part of the water treatment tank 10, and an inner peripheral surface contact type roller 32 </ b> C is suspended from the support member 61. The roller 32C supports the load of the stirring blade frame 12. However, as shown by a broken line in the drawing, an outer peripheral surface contact type roller 32B may be disposed side by side to suppress the load from above. In this embodiment, since it is not necessary to install a roller at the bottom of the water treatment tank 10, it is possible to prevent the accumulation of aggregates due to the presence thereof, and it is easy to monitor and maintain these members. . In some cases, the position where the roller 32C contacts the guide rail 34B can be above the water surface, and in this case, various means that are difficult to employ underwater can be employed.

  In the example of FIG. 14, an outer peripheral surface contact type roller 32B is installed at the bottom, and an inner peripheral surface contact type roller 32C is installed at the top, so that the load is distributed to many rollers 32C to reduce individual loads. It is a thing. Needless to say, in addition to those described in the above example, the outer peripheral surface contact type roller 32B and the inner peripheral surface contact type roller 32C can be arranged at appropriate locations and combined to take advantage of the respective advantages.

  FIG. 15 shows an embodiment relating to a driving device 16 for a horizontal flocculator. Between the driving device 16 and the stirring blade frame 12, the frame member 20 is attached to the frame member 20 on the end surface and has substantially the same diameter. A driving force transmission mechanism 66 including a rack 62 and a pinion 64 attached to the driving shaft 36 of the driving motor is provided. According to such a configuration, since the stirring blade 26 is driven by the outer diameter portion of the stirring blade 26, the required torque of the drive device 16 is reduced, and the drive device 16, the drive shaft 36, and the drive bearing 40 are respectively reduced. Can be cheaper. In addition, since the drive shaft 36 is located near the water surface, the water pressure applied to the water sealing device 38 is low and water sealing becomes easy.

  FIG. 16 shows a structure in which a driving force transmission mechanism 66A composed of a pinion 64A and a rack 62A is incorporated into the support structure 14 of the present invention. That is, in the horizontal flocculator of the embodiment of FIG. 9, a rack 62A is formed on the inner peripheral surface of the guide rail 34B, while a common drive shaft 68 connected to the drive device 16 is installed on the upper part of the water treatment tank 10. . The pinion 64A supported by the support fitting 60 is engaged with the rack 62A, and the driving force of the common drive shaft 68 is transmitted to the pinion 64A via the gear 70. It is not necessary to form and drive racks on all the guide rails 34B, and the guide rails 34B may be appropriately selected according to the length and strength of the stirring blade frame 12.

  In this embodiment, since the driving force is transmitted not only from one end side of the stirring blade frame 12 but also from a portion dispersed in the longitudinal direction, even if the stirring blade frame 12 is long, excessive torsional stress is applied. Therefore, displacement due to torsional deformation and misalignment of the shaft center are unlikely to occur. In addition, since the drive transmission mechanism including the drive device 16 is above the water surface, a water seal device or the like is not necessary, and manufacturing and maintenance costs are reduced.

It is a front view which shows the horizontal type | mold flocculator of 1st Embodiment of this invention. It is a cross-sectional view of the horizontal flocculator of FIG. It is a perspective view of the unit of the stirring blade frame which is the principal part of the horizontal flocculator of FIG. It is a disassembled perspective view of the unit of the stirring blade frame of FIG. It is (a) cross-sectional view and (b) perspective view which show the modification of a stirring blade frame. It is a figure which shows the structure of the bearing of a free end side. It is a figure which shows the modification of a guide rail. It is a front view which shows the horizontal flocculator of 2nd Embodiment of this invention. It is a cross-sectional view of the horizontal flocculator of FIG. It is a disassembled perspective view of the unit of the stirring blade frame of the horizontal flocculator of FIG. It is a figure which shows the structure of a movable coupling part. It is a cross-sectional view showing a modification of the support structure. It is a transverse cross section showing other modifications of a support structure. It is a cross-sectional view showing still another modification of the support structure. It is a figure which shows the modification of a drive device. It is a cross-sectional view which shows the other modification of a drive device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Water treatment tank 12 Agitation blade frame 14 Support structure 16 Drive apparatus 18 Driving force transmission part 20 Frame member 22 Reinforcement member 24 Frame part 26 Stirring blade 28 Crosspiece member 30 Skew reinforcement member 32, 32B, 32C Roller 34, 34A, 34B guide rail

Claims (7)

A horizontal flocculator installed in a water treatment tank,
A driving device disposed outside the water treatment tank;
A stirring blade frame disposed in the water treatment tank, having a horizontal axis, and having one or a plurality of stirring blades extending in parallel to the axial direction;
A driving force transmission unit for transmitting the driving force of the driving device to the stirring blade frame;
A support structure that rotatably supports the stirring blade frame so as to be rotatable about the axis;
The horizontal flocculator is characterized in that the support structure supports the stirring blade frame only at an outer peripheral portion of the stirring blade frame at a portion excluding both ends of the stirring blade frame.   The support structure has a plurality of rollers installed in one of the stirring blade frame and the water treatment tank, and a guide member having a sliding contact surface installed on the other of the rollers and contacting the roller. The horizontal flocculator according to claim 1.   The horizontal flocculator according to claim 2, wherein the roller is provided in the stirring blade frame, and the guide member is provided in the water treatment tank.   The horizontal flocculator according to claim 3, wherein the guide member has an arc shape with a central angle of a semicircle or less.   The horizontal flocculator according to claim 2, wherein the roller is provided in the water treatment tank, and the guide member is provided in the stirring blade frame.   6. The horizontal flocculator according to claim 1, further comprising a reinforcing member disposed obliquely so as to supplement the torsional strength of the stirring blade frame.   The horizontal flocculator according to any one of claims 1 to 6, wherein the stirring blade frame is provided with a float for imparting buoyancy to the stirring blade frame.

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