JP2007222771A - Device for inducing convection in water tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To crush, diffuse, stir and mix precipitates of a bottom layer and suspended matters of upper layer by inducing conviction in a water tank. <P>SOLUTION: The device for inducing conviction in the water tank comprises an upper pipe having a delivery opening formed at its upper end, a lower pipe having a delivery opening formed at its lower end, a casing provided between both the pipes and having suction openings formed on its periphery, and impellers provided in the upper pipe and the lower pipe and having a blade having an each other oppositely directed torsion, wherein the device is left standing in the water tank, and the water sucked in from the suction openings is delivered out of the openings of the upper and lower pipes. The delivery opening of the upper pipe is directed in the direction parallel to the water face; and the casing is constituted by such that the two suction openings separated in the upper part and the lower part are secured by disposing a partition plate at the center, and outer hulls connecting to each of the upper and lower pipe and having a diameter smaller than the partition plate. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is installed in a large water tank or the like in which water (liquid) is stored, sucks water from the middle layer in the water tank and discharges it into an upper layer and a lower layer, thereby allowing high-speed water flow and water surface along the bottom surface of the water tank. It is related with the convection inducing apparatus in a water tank which raises the high-speed water flow along.

  As the above-described water tank, for example, there is a sewage tank for storing sewage. In such a sewage tank, solid matter such as sludge may be precipitated in the bottom layer, and suspended matter may be suspended in the upper layer. Therefore, if sewage (hereinafter referred to as water) is stirred and mixed up and down, both solid and suspended matter will diffuse. By the way, the applicant first connected a casing having a discharge port on the outer periphery between an upper pipe having a suction port at the upper portion and a lower pipe having a suction port at the lower portion, and twisted the upper and lower pipes respectively. A water and sewage stirring and mixing device incorporating an impeller having blades with opposite twisting directions has been proposed (Patent Document 1).

According to this, by rotating the impeller, the upper and lower layers of water are sucked and discharged from the middle layer, so that the water and sewage are mixed and both solid and suspension are diffused. Therefore, this device may be applied to the stirring in the water tank. However, when a high-speed water stream is discharged from the discharge port in the middle of the device, both solids and suspensions, particularly solids in the bottom layer. It was found that the diffusion of was not sufficient. In order to effectively disperse the solid matter that has settled in the bottom layer, it is necessary to generate a high-speed water stream along the bottom surface in the bottom layer, and it is not sufficient to discharge the high-speed water stream from the middle layer. is there.
JP 2005-125223 A

  The present invention solves the above problems. In short, by sucking water from the casing existing in the middle layer and discharging it from the upper and lower pipes, a high-speed water flow in the lateral direction is generated in the bottom layer and the upper layer. In this, the suction port formed in the casing and the discharge port formed in the upper and lower pipes are efficiently configured.

  Under the above-described problems, the present invention provides an upper pipe having a discharge port formed at the upper end and a lower end and a casing having a suction pipe formed at the outer periphery thereof, as described in claim 1, and is set up in a water tank. In addition, an impeller having blades with opposite torsional directions is arranged in the upper and lower pipes, and the water sucked from the suction port of the casing by rotating the impeller is discharged from the discharge ports of the upper and lower pipes. In the convection induction device, the discharge port of the upper pipe is guided in a direction parallel to the water surface, and the above-described casing is provided with a partition plate at the center and two suction ports separated from the upper and lower sides thereof are secured. And a convection inducing device in an aquarium, characterized in that the outer plate has a smaller diameter than the partition plate connected to the lower pipe.

  According to the present invention, in the convection inducing apparatus described above, the drive shaft driven by the forward and reverse rotating motor attached to the upper pipe described in claim 2 passes through the casing and passes through the upper and lower pipes. Means for attaching each impeller to the drive shaft, the bell plate shape according to claim 3, wherein the partition plate has a circular shape and the outer plate gradually tapers toward the upper and lower pipes. In addition, a guide mound that gradually decreases toward the outer periphery at the top and bottom of the center of the partition plate is formed, and a flow path that is connected to the suction port by separating the outer plate and the guide mound with a plurality of independent spacers I will provide a.

  Furthermore, the present invention provides the above-described convection inducing device, wherein the spacer is twisted in a predetermined direction in a plan view, and is fixed above the upper pipe according to claim 5. A wave-dissipating and vortex-dissipating plate with a larger diameter than the upper pipe is connected by a plurality of independent stays, with the space between the stays serving as an outlet for the upper pipe, and the bottom surface of the wave-dissipating and vortex-dissipating plate The present invention provides means for forming a circular rectifying mound that gradually increases toward the outer periphery, and means for twisting the stay in a predetermined direction in plan view.

  Since the present invention takes the means of claim 1 and discharges the water sucked from the suction port in the middle stage of the apparatus into upper and lower parts, the lower discharge flow hits the bottom surface of the water tank and the high-speed water flow along the bottom surface And the solids in the bottom layer are diffused. Similarly, the upper discharge flow is guided in the lateral direction, flows as a high-speed water flow near the water surface, and diffuses suspended matter. In addition, since the two suction ports formed in the casing are formed between the central partition plate and the outer shell plate provided above and below the central partition plate, the outer diameter of the outer shell plate is set to be larger than the outer edge of the partition plate. The two suction ports are isolated from each other, and the water above and below the partition plate is not mixed. Therefore, vortex and turbulence are not generated in the casing during suction, and the flow is smooth.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a convection induction device in an aquarium showing an example of the present invention, FIG. 2 is a partially sectional front view, FIG. 3 is a sectional view taken along line AA in FIG. However, in this convection inducing device, the upper pipe 4 is suspended by a plurality of independent stays 3 at a predetermined interval 2 from the lower surface of a wave-dissipating and vortex-dissipating plate (hereinafter referred to as a wave-dissipating plate) 1 floating on the water surface. Is. The casing 5 is connected to the lower end of the upper pipe 4, the lower pipe 6 is connected to the lower end of the casing 5 and extended downward, and the lower end of the lower pipe 6 is set at a certain height from the bottom of the water tank. It was made to stand. Thus, the space between the stays 3 in the space 2 above the upper pipe 4 is the upper discharge port 7, the lower end of the lower pipe 6 is the lower discharge port 8, and the central outer periphery of the casing 5 is the suction port 9. 10.

  In this case, the wave-dissipating plate 1 is set to be larger than the diameter of the upper pipe 4, and the stay 3 connecting the wave-dissipating plate 1 and the upper pipe 4 is arranged equally on the circumference, and a thin plate is used. It is made up of things that extend radially. Thereby, the stay 3 exhibits the effect which rectifies | straightens the water which distribute | circulates in the meantime (it becomes the discharge outlet 7). Further, when the stay 3 is curved in a specific direction, there is an effect that the discharge flow increases or decreases the degree of the swirl flow based on the rotation of the impeller described later. In addition, since the discharge flow collides with the wave-dissipating plate 1 and can change its direction by approximately 90 °, if a circular rectifying mound 31 that gradually increases toward the outer periphery is provided on the lower surface of the wave-dissipating plate 1, The bend is smooth. Furthermore, the lower end of the lower pipe 6 (which becomes the discharge port 8) forms a joint flange 6a in this example, but this is for adding another pipe. The outlet 8 can be deeper.

  The casing 5 has a shape in which two bell mouth bodies are vertically aligned, and the diameter details of the upper and lower ends are combined with the diameters of the upper and lower pipes 4 and 6 and are flange-coupled. A partition plate 11 is provided at the central maximum diameter portion of the casing 5, and outer shell plates 14, 15 having a circular shape in plan view that are tapered toward the upper and lower ends with spacers 12, 13 interposed therebetween. It has a bell mouth shape. Therefore, the height of the spacers 12 and 13, that is, the gap between the outer plates 14 and 15 and the partition plate 11 becomes the two suction / discharge ports 9 and 10. In this case, the outer plates 14 and 15 have a condition that the maximum diameter is smaller than the diameter of the partition plate 11, whereby the suction ports 9 and 10 are isolated, and the water flowing from each of them They do not interfere with each other and have high suction efficiency.

  In addition, guide mounds 16 and 17 that gradually lower toward the outer periphery are provided in the upper and lower centers of the partition plate 11 inside the outer plates 14 and 15, and the outer plates 14 and 15 and the guide mounds 16 and 17 are provided. A curved space of approximately 90 ° separated by the spacers 12 and 13 becomes the flow paths 18 and 19 continuing from the suction ports 9 and 10. The direction change of the water which flows through the flow paths 18 and 19 is made smooth. And these flow paths 18 and 19 are made into the shape which narrows the volume, so that it goes to an outer peripheral side (suction port 9, 10). A plurality of spacers 12 and 13 are provided in a radial pattern. However, the spacers 12 and 13 are not limited to straight lines, but may be curved. According to the latter, the degree of swirling flow caused by the impeller of the inflowing water. Can be strengthened or loosened.

  An electric motor 20 is provided at the upper end of the wave-dissipating plate 1, and a drive shaft 22 is connected to an output shaft of the wave-dissipating plate 1 via a coupling 21, and the drive shaft 22 is pivotally supported by an upper bearing 23 to connect the upper pipe 4. Further, it is supported by the underwater bearing 24 in the casing 5 and is inserted through the lower pipe 6. Impellers 25 and 26 are respectively attached to the drive shafts 22 inside the upper and lower pipes 4 and 6 on the side close to the casing 5. The impellers 25 and 26 have blades 29 and 30 that protrude from the outer circumferences of the bosses 27 and 28 by being twisted at a predetermined angle (pitch). Part of the wave-dissipating plate 1 is submerged in water, but the entire apparatus is subjected to buoyancy by the wave-dissipating plate 1 or another buoyant body, or is hung from a land facility. Upright inside.

  The twisting direction of the blade (blade) 30 of the lower impeller 26 is opposite to the twisting direction of the blade 29 of the upper impeller 25. Therefore, when the electric motor 20 is driven and the impellers 25 and 26 are rotated, water is sucked from the suction ports 9 and 10 of the casing 5 in the middle stage, and the discharge ports 7 and 6 of the upper and lower pipes 4 and 6 at the upper and lower positions. 8 is discharged. In this case, since the two suction ports 9 and 10 of the casing 5 are isolated by the partition plate 11 and the respective suction flows do not interfere with each other, the suction efficiency is high as described above.

  When the above convection inducing device is operated in the water tank, the middle layer of water is sucked from the suction ports 9 and 10 of the casing 5 and discharged from the upper and lower discharge ports 7 and 8 of the upper pipe 4 and the lower pipe 6. Discharge. At this time, the water flow discharged from the lower discharge port 8 collides with the bottom surface of the water tank and is changed in all directions by 360 °, and flows as a high-speed water flow along the bottom surface. Therefore, even if solids are precipitated near the bottom layer, they are crushed and diffused. For this purpose, the flow velocity of the water flow discharged from the discharge port 8 of the lower pipe 6 needs to be maintained at a predetermined level up to the bottom of the water tank, and the length of the lower pipe 6 depends on the depth of the water tank. It is determined.

  Similarly, the water flow discharged from the discharge port 7 whose direction is horizontally changed at the upper level flows horizontally as a high-speed water flow near the surface toward all 360 ° directions. Therefore, even if the suspension is floating in the upper layer, it is diffused. At the same time, both high-speed water streams collide with the opposing wall surfaces of the water tank and change their direction, and thereafter become a flow circulating in the water tank. That is, two circulating convection flows centered on this device in the water tank are caused, and the crushing and diffusion of solids and suspensions and the stirring and mixing of the sewage water are continued.

  By the way, what solidified solid substance may exist in a water tank, and if this is inhaled, the casing 5 and the upper and lower pipes 4 and 6 may be clogged. In such a case, when the electric motor 20 is reversed, the flow of water by the impellers 25 and 26 is reversed, so that the clogged material is discharged. The reverse rotation of the electric motor 20 is not limited to the case where the motor 20 is clogged, but is also suitable when the apparatus is used in a water and sewage agitation and mixing apparatus for countermeasures against red tides in closed water areas and the like and for improving anoxic conditions by stratification. That is, by performing a reversible operation in which the suction ports 9 and 10 and the discharge ports 7 and 8 are reversed, the water and sewage can be effectively stirred and mixed. When performing the reverse operation, the tip of the lower pipe 6 is shaped like a bell mouth (the bell mouth body is connected to the joint flange 6a), or a hole for taking in air is formed in the wave-dissipating plate 1 to provide an aeration function. It is effective to do.

  The above is the basic form of the present invention, but the present invention may take various modified forms. For example, the amount of water flowing through the upper pipe 4 and the lower pipe 6 can be changed. This can be dealt with by changing the diameter and pitch of the impellers 25 and 26 or the diameters of the upper and lower pipes 4 and 6. In the case of a ship propeller, there is a variable pitch propeller whose blade angle (pitch) can be changed remotely, and this may be applied to the impellers 25 and 26. It is also possible to restrict the openings of the stay 3 and the spacers 12 and 13 to cause the suction flow and the discharge flow from the suction ports 9 and 10 and the discharge ports 7 and 8 to flow only in a specific direction.

It is a perspective view of the convection induction apparatus of this invention. It is a partial cross section front view of the convection induction apparatus of this invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is explanatory drawing which shows the convection induction state by the convection induction apparatus of this invention.

Explanation of symbols

1 Wave-dissipating and vortex-quenching plate 2 Interval 3 Stay 4 Upper pipe 5 Casing 6 Lower pipe 6a フ ラ ン ジ flange 7 Upper pipe discharge port 8 Lower pipe discharge port 9 Casing suction port 10 〃
11 Partition plate 12 Spacer 13 〃
14 Outer plate 15 〃
16 Guide mound 17 〃
18 Channel 19 〃
20 Electric motor 21 Coupling 22 Drive shaft 23 Upper bearing 24 Underwater bearing 25 Impeller 26 〃
27 Impeller Boss 28 〃
29 Impeller blade 30 〃
31 Commutation mound

Claims (6)

  An upper pipe with a discharge port formed at the upper end and a lower pipe with a discharge port formed at the lower end are provided in the water tank with a casing formed with a suction port on the outer periphery, and twisted in the upper and lower pipes. In the convection inducing device in the aquarium, the impeller having a blade made of the opposite is disposed, and the water sucked from the suction port of the casing by rotating the impeller is discharged from the discharge port of the upper and lower pipes. The above-mentioned casing is provided with a partition plate in the center, and two suction ports separated from the upper and lower sides thereof are secured, so that the diameter is larger than the partition plates connected to the upper and lower pipes, respectively. A convection inducing device in an aquarium characterized by comprising a small outer shell plate.   2. A water tank according to claim 1, wherein a drive shaft driven by an electric motor capable of rotating forward and reverse attached to the upper pipe passes through the casing and passes through the upper and lower pipes, and each impeller is attached to the drive shaft. Convection inducing device.   The partition plate has a circular shape, and the outer plate has a bell mouth shape that tapers toward the upper and lower pipes, and a guide mound that gradually decreases toward the outer periphery at the top and bottom of the partition plate. The convection in-water apparatus according to claim 1 or 2, wherein the outer plate and the guide mound are separated by a plurality of independent spacers and connected to the suction port.   The convection inducing device in a water tank according to claim 3, wherein the spacer is twisted in a predetermined direction in a plan view.   A wave-dissipating and vortex-dissipating plate having a diameter larger than that of the upper pipe is connected to the upper pipe by a plurality of independent stays at a certain interval above the upper pipe. The in-water convection inducing device according to any one of claims 1 to 4, wherein a circular rectifying mound that gradually increases toward the outer periphery is formed on the lower surface of the wave and vortex quenching plate.   The in-water convection inducing device according to claim 5, wherein the stay is twisted in a predetermined direction in plan view.