JP2005155514A - Fluid transfer device for sewage disposal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid transfer device for transferring solid foreign matters removed from sewage through fluid so that solid foreign matters removed from the sewage such as dregs are taken out of a water discharge pump without allowing the solid foreign matters to be afloat on the water level in a stirring tank. <P>SOLUTION: Dregs scraped up from a sediment sand pond are finely pulverized by a pulverizing device 12, and charged into a stirring tank 10 from an opening part 11-1. A pair of stirring devices 14 are provided on a side wall of the stirring tank 10 symmetrically in the diameter direction, and a horizontal swirl is formed in the stirring tank 10 by the turn of stirring blades 18 of the stirring devices 14. Outer guide blades 25 are provided on an inner circumferential wall surface of the stirring tank 10, and inner guide blades 26 are provided on a stay 27 extending in the vertical direction at the center of the stirring tank 10. The guide blades 25 and 26 convert the swirl into the flow in the vertical direction, and the pulverized dregs charged into the stirring tank 10 are not afloat but sucked to a fluid transfer pipe 23 by a water discharge pump 24 from a discharge pipe 22 below the fluid surface, and fluid-transferred to a dregs cleaning device installed close to the ground surface. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fluid transfer device that fluidly transfers solid foreign substances removed from wastewater, and can be used particularly suitably for floating solid foreign substances such as residue.

Fluid transfer for sewage treatment in which slag removed from the sedimentation ground is crushed by a crushing device and then guided to a stirring tank, and water in the scouring tank containing crushed residue is fluid-transferred through a fluid transfer pipe by a drainage pump. An apparatus is known (Patent Document 1). A stirring device is installed on the side of the agitation tank, and a throw-out type drainage pump is installed at the bottom of the agitation tank so that the suction port opens to the agitation tank, and the discharge port of the drainage pump is connected to the fluid transfer pipe. The crushed residue in the agitation tank is agitated by the agitation blades, and the crushed residue-containing water sucked by the drain pump is sent to the fluid transfer pipe from the discharge outlet and fluid-transferred to the residue cleaning device. . Since the residue is transferred in the fluid transfer pipe under the fluid condition, there is no scattering to the outside like when the residue is conveyed by the conveyor, and the residue is transferred in the fluid transfer pipe in a sealed state. Therefore, the fluid transfer system is also excellent as an environmental measure in that it emits less odor compared to the conveyor transported to the outside.
JP2002-248492

  In the prior art, the crushed residue is put into a stirring tank, and a rotating swirl of the rotating blade causes a horizontal swirling flow in the stirring tank to stir. In the swirl flow in the direction, it is difficult to obtain a uniform stirring effect over the entire stirring tank, and the residue is likely to float on the water surface in the stirring tank because the specific gravity is small. Therefore, when the water in the agitation tank is continuously discharged to the fluid transfer pipe by the drainage pump, the residue remains floating on the surface of the water, and most of the residue is not sucked into the drainage pump until the end. In the viscous state, it was deposited on the bottom surface of the stirring tank, and finally, it was possible that the residue had to be removed manually.

  The present invention has been made in view of the above-described problems of the prior art, and the fluid transfer pipe is smoother than the drainage pump without causing solid foreign matters removed from the sewage such as residue to float on the water surface in the stirring tank. It is intended to be able to be taken out.

  According to the first aspect of the present invention, there is provided a fluid transfer device for fluidly transferring solid foreign matters removed from wastewater, and water containing solid foreign matters and a solid foreign matter introduction port for introducing the solid foreign matters. A stirring tank provided with a discharge port, a swirling flow generating means for generating a swirling flow in the stirring tank, and a flow direction converting means for converting the swirling flow into a longitudinal flow toward the discharge port of the stirring tank. Provided is a fluid transfer device for treating sewage.

  According to a second aspect of the present invention, in the first aspect of the present invention, the flow direction changing means is a guide vane installed on the peripheral surface of the agitation tank. An apparatus is provided.

  According to a third aspect of the present invention, in the first aspect of the present invention, the flow direction changing means is a guide vane installed at the center of the stirring tank, and is a fluid transfer for sewage treatment An apparatus is provided.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, a support column is installed at the center of the stirring tank, and the guide blade is fixed to the support column. A fluid transfer device is provided.

  According to invention of Claim 5, in the invention as described in any one of Claims 1-4, the swirl | flow which forms the swirl | flow which goes to a discharge port in the stirring tank in the site | part of the said discharge port Provided is a fluid transfer device for wastewater treatment characterized by comprising a forming means.

  According to the invention described in claim 6, in the invention described in any one of claims 2 to 4, the guide blade is configured such that the height gradually decreases toward the discharge port. A fluid transfer device for treating sewage is provided.

  The operation and effect of the invention of claim 1 will be explained. Solid foreign matters such as crushed residue are introduced into the stirring tank through the solid foreign substance introduction port, and the swirling flow generating means is swirling of water containing solid foreign substances in the stirring tank. A flow is induced, and the flow direction changing means acts on the swirling flow in the stirring tank to generate a vertical flow toward the discharge port of the stirring tank. Therefore, even if the solid foreign matter has a specific gravity of less than 1.0, such as a residue, it can be smoothly taken out from the discharge port without floating on the surface, and does not adhere to and accumulate on the bottom surface of the stirring tank. Therefore, it is possible to continue smooth operation without stopping for a long time.

  The operation and effect of the invention of claim 2 will be described. The guide vanes are installed on the peripheral surface of the stirring tank, and the guide vanes act on the outer periphery of the swirling flow formed in the stirring tank to generate the swirling flow. It converts into the flow of the vertical direction which goes to the said discharge port of a stirring tank. This configuration in which the guide vanes are installed on the inner peripheral wall surface of the agitation tank is suitable for obtaining a desired amount of sewage treatment with a large diameter shallow agitation tank.

  The operation and effect of the invention of claim 3 will be described. The guide vane is installed in the central portion of the stirring tank, and causes a vertical flow toward the discharge port of the stirring tank by acting on the swirling flow in the central portion. To do. Since the guide vanes are installed in the central portion of the stirring tank, a desired amount of sewage treatment can be obtained by appropriately setting the depth of the stirring tank even if the diameter of the stirring tank is small.

  The operation and effect of the invention of claim 4 will be described. By providing the support column, a reliable support part for the guide vane is secured, and at the same time, the diameter of the support column is set to an appropriate size so that it is included in the sewage. It is possible to prevent foreign matters such as hair from getting entangled with the support.

  The action and effect of the invention of claim 5 will be described. Since the swirl flow forming means forms a swirl flow toward the discharge port in the stirring tank at the exit portion, the swirl flow forming means supplies the water containing foreign matter from the stirring tank to the discharge port. The discharge can be performed smoothly, and the accumulation of foreign matters on the bottom of the stirring tank can be more reliably prevented.

  The operation and effect of the invention of claim 6 will be explained. Since the guide vanes are gradually reduced in height toward the discharge port, the sharp protrusions that can become tangled places such as hair in the sewage. Since the portion is not formed on the guide vane, the entanglement of the foreign matter is difficult to occur, and even if it is entangled, it can be solved immediately. Therefore, the accumulation of the foreign matter is difficult to occur, and a smooth operation for a long time can be continued.

  In the following, the embodiment of the present invention is crushed from the sedimentation ground in the same manner as in Japanese Patent Laid-Open No. 2002-248492, and then the residue is led to a stirring tank and is transported in the fluid transfer pipe to the ground residue transfer site. The case will be described. The agitation tank 10 is provided in the vicinity of a sand sink (not shown), and the upper surface of the agitation tank 10 is wide open, and the opening is closed by a top plate 11. The top plate 11 has a rectangular opening 11-1 (solid foreign matter inlet of the present invention), and the crushed residue is introduced into the stirring tank 10 through the opening 11-1. The stirring tank 10 has a cylindrical shape with a circular cross section, and a lower end portion 10-3 is connected to a lower end side thereof via a tapered relay portion 10-2.

  The crushing device 12 is located above the agitation tank 10, and the crushing device 12 includes a hopper unit 12-1 that receives the residue S to be crushed, a cutter unit 12-2 that crushes the residue, and a cutter unit. An electric motor 12-3 for rotationally driving the 12-2 and a crushing residue discharging unit 12-4 are provided. The discharge part 12-4 is disposed so as to face the opening 11-1 formed in the top plate 11 of the stirring tank 10. The conveyor 13 is provided in the same manner as in Japanese Patent Application Laid-Open No. 2002-248492. Although not shown, the conveyor 13 receives the residue scraped up from the sand sink adjacent to the agitation tank 10, and the hopper portion 12-1 of the crushing device 12 has an arrow a as shown by an arrow a. Let fall into. The residue from the hopper portion 12-1 is crushed by the cutter portion 12-2 driven by the electric motor 12-3, and the crushed residue is opened from the discharge portion 12-4 as indicated by an arrow b. -1 to the stirring tank 10.

  The stirring tank 10 is provided with a pair of stirrers 14 at opposite diameter positions on the side wall thereof (the pair of stirrers 14 constitutes the swirl flow generating means of the present invention). As shown in FIG. 2, the stirring device 14 includes a rotation drive motor 16 and a stirring blade 18 connected to a rotation shaft of the rotation drive motor 16. The rotating shaft of the rotary drive motor 16 extends in the horizontal direction, and the stirring blade 18 rotates in the direction of the arrow c in FIG. 4 about the horizontal axis L (FIG. 3). As shown in FIG. 4, a guide plate 20 is disposed at a position slightly above the outer periphery of the stirring blade 18, and the guide plate 20 is fixed to the side wall of the stirring vessel 10 by appropriate means. The guide plate 20 extends in the circumferential direction at the upstream portion in the rotational direction c of the stirring blade 18, but extends horizontally in the tangential direction at the downstream portion 20 </ b> A in the rotational direction from the top. Therefore, the water flow induced in the same direction by the rotation of the stirring blade 18 in the direction of the arrow c is guided by the downstream portion 20A of the guide plate 20 so as to flow in the tangential direction indicated by the arrow d. In the two agitating blades 18 of FIG. 2 opposed in the diametrical direction, the guide plates of FIG. The tangential flow d guided by the guide plate 20 corresponds to the circumferential direction counterclockwise as shown in FIG. Therefore, the two stirring blades 18 in FIG. 2 opposed to each other in the diametrical direction cause the water in the stirring tank 10 to be horizontal around an upright center line (perpendicular to the plane of FIG. 2) as indicated by an arrow D in FIG. A swirling flow is induced.

  A discharge pipe 22 (discharge port of the present invention) is connected to the bottom 10-3 at the lower end of the stirring tank 10, and the discharge pipe 22 opens tangentially to the bottom 10-3 of the stirring tank 10, as shown in FIG. doing. Therefore, a swirl flow e is formed at the bottom 10-3 of the stirring tank 10 when discharged from the discharge pipe 22, and the direction of the swirling flow e is the swirl formed by the pair of stirring devices 14 in the stirring tank 10. The direction coincides with the flow D. The structure in which the discharge pipe 22 opens tangentially to the bottom 10-3 of the stirring tank 10 and forms the swirling flow e in the bottom 10-3 of the stirring tank 10 is the swirling flow forming means of the present invention. In FIG. 1, reference numeral 23 denotes a fluid transfer pipe for transferring water containing crushed residue, and the opposite ends of the fluid transfer pipe 23 and the discharge pipe 22 are flange portions 23-1, 22-. The other end of the fluid transfer pipe 23 is connected to each other, and the other end of the fluid transfer pipe 23 is located at a relatively high site as a water purification plant close to the road surface for cleaning the residue. It extends to the residue cleaning device. The arrangement structure of the fluid transfer pipe 23 extending to the residue cleaning device is the same as that described in JP-A-2002-248492. A drainage pump 24 is provided at a portion of the fluid transfer pipe 23 close to the agitation tank 10, and water containing crushed and residue from the agitation tank 10 is sucked by the drainage pump 24 and fluid transfer pipe 23 to the residue cleaning site. (Arrow f), and this fluid transfer can be performed in the same manner as that disclosed in JP-A-2002-248492.

  As shown in FIG. 2, the outer guide vane 25 is disposed along the inner peripheral wall surface in the stirring tank 10, and the inner guide vane 26 is disposed at the center. The guide vanes 25 and 26 constitute the flow direction changing means of the present invention. As shown in FIGS. 2 and 3, a pair of outer guide vanes 25 are disposed on the inner wall surface of the stirring tank 10 symmetrically by 180 degrees, and an upright column 27 extends vertically in the center of the stirring tank 10. The lower end of the support column 27 is fixed to the bottom plate 10-4, the upper end of the support column 27 is fixed to the top plate 11, and the inner guide vane 26 is fixed to the support column 27 having a circular section in a spiral shape. The outer guide vane 25 is thin and formed of a plate material having a width w at the upper end 25-1, and the outer guide vane 25 is welded to the inner peripheral surface of the stirring vessel 10 at one side edge 25-2 in the width direction. From the inner peripheral surface of the stirring tank 10, it stands up and is fixed toward the inside of the stirring tank 10. In this embodiment, the standing direction (the direction of the width w) of the outer guide vane 25 is a direction parallel to one diameter line. And the fixing | fixed site | part of the outer side guide blade 25 with respect to the inner peripheral wall of the stirring tank 10 is helically displaced in the rotation direction D of a swirl | vortex flow from the top to the bottom, and the uppermost attachment part and the lowermost attachment part Then, it is fixed by welding along the circumferential surface of the stirring tank 10 by shifting by r (see FIG. 2). Since the pair of outer guide vanes 25 are provided 180-degree symmetrically, any outer guide vane 25 acts on the swirling flow in the rotation direction D, thereby causing the water flow in the vertical direction from above to below (arrow g in FIG. 3). Acts to convert to The height of the outer guide vanes 25 from the inner peripheral surface of the stirring tank 10 is the same up to the middle, but thereafter the height is gradually lowered, and the height = 0 at the lowermost end (the peripheral surface and the surface) 1).

  Next, the inner guide vane 26 will be described. The inner guide vane 26 is also formed of a thin plate material, and the inner guide vane 26 is helically fixed to the outer peripheral surface of the support column 27. The fixed portion of the inner guide vane 26 with respect to the support column 27 is displaced in the direction of the swirl flow from the top to the bottom. In other words, the direction in which the spiral extends is the direction of the swirl flow D from top to bottom. Therefore, similarly to the outer guide vane 25, the inner guide vane 26 also achieves a function of converting the flow in a vertical direction (arrow g) from top to bottom with respect to the swirling flow. Similarly to the outer guide vane 25, the height of the inner guide vane 26 is constant in the upper portion, but the vane gradually decreases from a certain height, and finally is flush with the column 27 ( Height = 0).

  Describing the operation of the present invention, the residue scraped from the sand settling ground (not shown) is carried by the conveyor 13 to the agitation tank 10 located near the sand settling ground. That is, the residue on the conveyor 13 is received by the hopper section 12-1 of the crushing device 12 (arrow a), crushed in the cutter section 12-2, dropped from the discharge section 12-4 (arrow b), and the opening section. It is put into the stirring tank 10 through 11-1. The agitation tank is filled with treated water (for example, water taken from an appropriate part of the sewage system), and the residue is mixed with the treated water in a slurry form. The stirring blade 18 is rotated as indicated by an arrow c in FIG. 4 by the rotation drive motor 16, and the water flow is guided in the tangential direction d by the guide plate 20, causing a horizontal swirling flow D (FIG. 2) in the stirring tank, The residue is stirred and mixed in the treated water. The swirling flow hits the outer guide vane 25 fixed to the inner peripheral wall of the stirring vessel 10 and the inner guide vane 26 fixed to the central support column 27. Since both the outer guide vane 25 and the inner guide vane 26 have a shape that is shifted in the rotational direction D of the swirl flow from the top to the bottom, the swirl flow D when it hits the outer guide vane 25 and the inner guide vane 26. Is converted downward, that is, in the vertical direction g. Such downward vertical flow prevents foreign matter such as a residue having a small specific gravity from floating on the surface of the water, and can be evenly mixed with the residue as treated water.

  After completion of the introduction of the residue by the conveyor 13, the drainage pump 24 is driven to transfer the residue fluid, and the treated water in the agitation tank 10 is sucked into the discharge pipe 22 together with the crushed residue mixed therein, and the fluid is transferred. By the pipe 23, the fluid is conveyed to the residue washing site near the road surface having a relatively higher height than the sand sink (and the agitation tank 10) (arrow f). Since the discharge pipe 22 opens in the tangential direction of the bottom 10-3, when the water in the stirring tank 10 is sucked into the fluid transfer pipe 23 by the drainage pump 24, a swirling flow (arrow e) is generated in the bottom 10-3. It is formed. Further, since the stirring tank 10 is smoothly connected to the bottom portion 10-3 via the tapered relay portion 10-2, the flow rate from the stirring tank 10 to the bottom portion 10-3 is increased. The swirl flow is strengthened, and this strong swirl flow can contribute to prevention of stagnation and accumulation of residue on the bottom 10-3 of the stirring tank 10. Furthermore, although the height of the outer guide vane 25 and the inner guide vane 26 is the same from the upper end to the middle part, the height gradually decreases thereafter, and finally becomes flush, There are substantially no sharp protrusions in the outer guide vanes 25 or the inner guide vanes 26 that can cause tangling of the hair contained in the sewage. It should be noted that the diameter of the support column 27 to which the inner guide vane 26 is attached is set to an appropriate large value in order to prevent this because there is a risk of entanglement if the diameter is too small.

  The residue-containing water is fluidly transferred to a residue cleaning device (not shown) through the fluid transfer pipe 23, the residue is washed in the residue cleaning device, and the washed residue is transported to the disposal site by a truck or the like.

  The above is an explanation of the case where the present invention is crushed and realized in the fluid transportation of residue, but the present invention is intended to transfer a fluid in a well-mixed state without causing a small specific gravity that tends to float to the surface to float on the surface. Suitable not only for residue but also when transferring scum fluid. In the case of sand settling, the specific gravity is high and usually it is difficult to float on the surface of the water, and good mixing with water can be obtained only by swirling flow, and efficient fluid transfer is usually possible. In such a case of sedimentation, a fluid transfer system similar to that of the present invention is used and the swirl flow is converted into a longitudinal flow. By providing this, efficient fluid transfer becomes possible.

FIG. 1 is a longitudinal sectional view of a stirring tank in the apparatus of the present invention. FIG. 2 is a plan view of the stirring tank. FIG. 3 is a longitudinal sectional view of the agitation tank which is similar to FIG. 1 but omits the illustration of the support columns so that the arrangement of the guide blades installed on the inner periphery of the agitation tank becomes clear. FIG. 4 is an arrow view in the IV direction of FIG. FIG. 5 is a cross-sectional view taken along the line V-V in FIG.

Explanation of symbols

10: Stirring tank
11-1 ... Opening part of stirring tank (solid foreign matter inlet of the present invention)
12 ... Crushing device 14 ... Stirring device (swirl flow generating means of the present invention)
16 ... Rotation drive motor 18 ... Stirrer blade 20 ... Guide plate 22 ... Discharge pipe (discharge port of the present invention)
23 ... Fluid transfer pipe 24 ... Drain pump 25 ... Outer guide vane (flow direction changing means of the present invention)
26. Inner guide vane (flow direction changing means of the present invention)
27 ... post

Claims (6)

  A fluid transfer device for fluidly transferring solid foreign matter removed from sewage, comprising: a solid foreign matter introduction port for introducing the solid foreign matter and a water discharge port containing solid foreign matter; Sewage treatment characterized by comprising swirl flow generating means for generating swirl flow in the stirring tank, and flow direction changing means for converting swirl flow into a longitudinal flow toward the discharge port of the stir tank. Fluid transfer device.   2. The fluid transfer device for wastewater treatment according to claim 1, wherein the flow direction changing means is guide vanes installed on the peripheral surface of the stirring tank.   2. The fluid transfer apparatus for wastewater treatment according to claim 1, wherein the flow direction changing means is a guide vane installed at a central portion of a stirring tank.   4. The sewage treatment fluid transfer device according to claim 3, wherein a support column is installed at a central portion of the stirring tank, and the guide blade is fixed to the support column.   5. The sewage according to claim 1, further comprising swirl flow forming means for forming a swirl flow toward the discharge port in the agitation tank at the discharge port. Fluid transfer device for processing. 5. The fluid transfer device for wastewater treatment according to claim 2, wherein the guide blade is configured such that the height of the guide blade gradually decreases toward the discharge port.

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