JP5296646B2 - Stirring device having an air lift pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To lessen failure with a simple and durable structure that performs aeration while efficiently stirring a large amount of water with facility and running costs significantly reduced. <P>SOLUTION: The stirring device includes a stirring tank 1 that stores a predetermined liquid and an air lift pump 2 that sucks the liquid stored in the stirring tank 1 from a bottom thereof and discharges the same liquid at an upper portion thereof. The air lift pump 2 has a rising pipe 3 that is disposed so as to be extended to a liquid surface from the bottom to open a suction port 7 at a lower section and a delivery port 6 at the upper section and an air pump 4 that supplies the air to a lower section or the middle of this rising pipe 3 in the stirring tank 1. The rising pipe 3 includes a plurality of sub-rising pipes 30 that are disposed parallel, and the air is supplied into each sub-rising pipe 30 from the air pump 4, thereby elevating the liquid in the stirring tank 1 with each sub-rising pipe 30 to perform stirring. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a stirrer provided with an air lift pump, and more particularly to a stirrer optimal for stirring water in a water supply field, a sewage treatment plant, a building drainage tank, and the like.

  In sewage treatment plants and building drainage tanks, sewage is temporarily stored and drained, so that sludge and organic matter contained in the sewage decay and generate malodorous substances such as methyl mercabtan and hydrogen sulfide. In order to prevent this harmful effect, the Tokyo Metropolitan Government implements the “Guidelines on Building Structure and Maintenance, etc. (Building Pit Countermeasure Guidance Guidelines)” for building drainage tanks. Based on these guidelines, devices have been developed to prevent the odor of sewage. As a stirring device used for this purpose, a device that rotates a screw with a submersible motor, sucks sewage from above, and injects it in a horizontal direction is used. Further, in order to aerate and replenish oxygen in the sewage, this apparatus supplies pressurized air to the screw portion and agitates and blows out the air and sewage. Since this agitator uses a submersible motor, there are disadvantages that the equipment cost is high, the service life is short, and the power consumption is large, so that the running cost is also high.

  An apparatus for aeration while stirring sewage has been developed (see Patent Document 1). As shown in FIG. 1, the apparatus described in this publication raises and stirs the liquid with the rising force of the bubbles while injecting the bubbles into the water and aeration, thereby reducing the equipment cost as a simple structure. .

JP-A-8-103790

  However, the stirrer shown in FIG. 1 has a drawback that the liquid cannot be stirred efficiently. In particular, the flow rate that can be stirred is small, and there is a drawback that the entire liquid cannot be stirred efficiently in a large water tank. Furthermore, the agitation tank is also used for the purpose of coagulating and precipitating sludge and the like by adding a flocculant and mixing and stirring, but in this application, a large amount of water is efficiently stirred and quickly agglomerated. It is important to let them. However, the stirrer shown in FIG. 1 has a drawback that it is difficult to efficiently stir a large amount of water, and sludge cannot be rapidly aggregated and precipitated.

The present invention has been developed for the purpose of solving the above-mentioned drawbacks. An important object of the present invention is to provide an agitation device including an air lift pump capable of aeration while agitating a large amount of water efficiently while significantly reducing facility costs and running costs.
Another important object of the present invention is to provide an agitation device having an air lift pump that has a simple structure, no failure portion, durability, and reduced failure.

Means for Solving the Problems and Effects of the Invention

  The stirring device of the present invention includes a stirring tank 1 that stores a predetermined amount of liquid, and an air lift pump 2 that sucks the liquid in the stirring tank 1 from the bottom, discharges it to the top, and stirs it. The air lift pump 2 is disposed in the agitation tank 1 so as to extend from the bottom to the liquid level, and has a rising pipe 3 having a suction port 7 at the bottom and a discharge port 6 at the top, and a lower part of the rising pipe 3. Or an air pump 4 for supplying air in the middle. The ascending pipe 3 is composed of a plurality of sub-rising pipes 30 arranged in parallel to each other. Air is supplied from the air pump 4 to each of the sub-rising pipes 30, and the stirring tank 1 is provided with each sub-rising pipe 30. The liquid is raised and stirred.

  The agitator described above is characterized in that it can aerate a large amount of water efficiently while significantly reducing equipment costs and running costs. This is because the stirrer of the present invention uses the riser pipe as a plurality of sub-rise pipes and supplies air to each sub-rise pipe to raise the liquid in the sub-rise pipe. The air lift pump raises the specific gravity of the internal liquid with the air supplied to the ascending pipe. However, if the riser is made thicker in order to increase the flow rate, the air rises as bubbles inside the riser and the action of raising the liquid together decreases. That is, like the air lift pump described in the publication of the cited document 1, only the bubbles rise in the liquid and the liquid is efficiently raised and cannot be stirred. In the above stirring device, the rising pipe is constituted by a plurality of sub-rising pipes, so that one sub-rising pipe is thinned, and the liquid is efficiently raised and stirred by the air supplied to the thin sub-rising pipe. Incidentally, the flow rate of an air lift pump that supplies air with a 500 W blower to the lower end of the riser pipe having an inner diameter of 300 mm and a length of 1000 mm is 1000 liters / minute, whereas the riser pipe having an inner diameter of 300 mm is used. As shown in FIG. 4, the air lift pump 2 that is divided into four sub-rising pipes 30 as shown in FIG. 4 uses the same blower and has a flow rate of 1500 liters / min. Can be stirred up.

  Furthermore, since the above stirring device can be raised while stirring the air supplied to the inside of the sub-rising pipe with the liquid, a feature that allows efficient aeration in the process of raising the sub-rising pipe is also realized. Furthermore, since the agitator described above is a simple cylinder that does not require complicated parts such as a submersible motor, it has an extremely simple structure with no failure part, durability, and reduced failure. Realize.

  Furthermore, the agitator described above does not require the use of a large blower or the like for aeration, and realizes a feature that the power consumption can be reduced and the noise level can be extremely reduced. In addition, the above stirring device can be aerated while efficiently stirring the liquid in the stirring tank with a simple riser pipe and an air pump that supplies air to the rising pipe. However, it can be operated economically and with less energy consumption.

The stirring device of the present invention is provided with a partition wall 31 extending in the longitudinal direction inside the ascending pipe 3 and divided into a plurality of sub-rising pipes 30. The partition wall 31 has a flat plate-like plate material 31 </ b> B extending in the longitudinal direction of the ascending pipe 3 so that the vertical cross-sectional shape is radial. The partition wall 31 is divided into three or more sub-rising pipes 30 in which the inside of the rising pipe 30 is arranged in parallel with each other.
The above stirring device can efficiently raise and stir the liquid with a simple structure and using the rising pipe as a plurality of sub-rising pipes.

The stirring device of the present invention can be provided with the collecting portion 33 that is not partitioned by the partition wall 31 at the lower portion of the riser pipe 3 by positioning the lower end of the partition wall 31 above the lower end of the riser pipe 3.
The above stirring apparatus can manufacture a riser pipe with a long full length cheaply by making a some sub riser pipe shorter than the full length of a riser pipe, and lengthening a gathering part. For this reason, it can install in a deep stirring tank and can raise and stir a liquid efficiently from the bottom part to a liquid level. Further, the liquid that is raised by the plurality of sub-rising pipes provided at the upper part of the rising pipe sucks the liquid in the collecting portion, so that the liquid at the bottom of the deep stirring tank can be efficiently raised and stirred.

The agitation apparatus of the present invention includes an air injection pipe 35 that is connected to an air pump 4 and injects air into the riser pipe 3. The air injection pipe 35 is connected to the gathering portion 33 of the riser pipe 3. By providing the air jetted from the air jet pipe 35, the air can be raised from the gathering portion 33 and branched into each sub-rising pipe 30 to be supplied.
The above stirring device can supply air to a plurality of sub-rising pipes from one air jet pipe, and can efficiently raise and stir the liquid in each sub-rising pipe. For this reason, the structure of the riser pipe can be made very simple while the structure is provided with a plurality of sub riser pipes.

The agitation device of the present invention is provided with a plurality of air injection pipes 35 in the collection portion 33 of the riser pipe 3 and supplies air injected from each air injection pipe 35 to the collection portion 33 to each sub-rise pipe 30. can do.
The above stirring devices supply air from a plurality of air injection pipes to a plurality of sub-rising pipes, so that air is supplied to each sub-rising pipe in an ideal state, and the liquid is efficiently raised by the sub-rising pipes. And can be stirred.

The stirring device of the present invention is supplied from the injector 12 by connecting an injector 12 for injecting liquid, powder, gas, or a mixture obtained by mixing them to the lower part of the riser 3. The mixture to be mixed can be mixed with the liquid rising inside the ascending pipe 3.
The above stirring apparatus can efficiently stir the mixture to be supplied here while raising the liquid with the rising pipe. That is, both stirring and mixing can be realized with a simple structure.

The stirring device of the present invention can connect the injector 12 in the middle of the air pipe 5 formed by connecting the air pump 4 and the rising pipe 3.
The above stirrer has a simple structure by sucking the mixture into the air pipe using the ejector effect of the air that flows at high speed through the air pipe and then injecting the mixture from the air pipe into the riser pipe. There is a feature that the mixture can be efficiently supplied to the riser and mixed uniformly.

  In the agitation device of the present invention, the agitation tank 1 can be any one of a building drainage tank 21, a water tank agitation tank, and a sewerage agitation tank.

It is sectional drawing of the conventional stirring apparatus. It is the schematic which shows the usage example of the stirring apparatus concerning one Example of this invention. It is a schematic block diagram of the stirring apparatus concerning one Example of this invention. It is a disassembled perspective view of the riser pipe of the air lift pump shown in FIG. It is a vertical sectional view of the rising pipe of the air lift pump shown in FIG. It is a horizontal sectional view of the riser pipe of the air lift pump shown in FIG. It is a disassembled perspective view which shows another example of the riser pipe of an air lift pump. It is a disassembled perspective view which shows another example of the riser pipe of an air lift pump. It is a vertical sectional view showing another example of the rising pipe of the air lift pump. It is a horizontal sectional view of the riser pipe of the air lift pump shown in FIG. It is a horizontal sectional view showing another example of the rising pipe of the air lift pump. It is a vertical sectional view showing another example of the rising pipe of the air lift pump. It is a schematic block diagram which shows another example of an air lift pump. It is a schematic block diagram which shows another example of an air lift pump. It is a schematic block diagram which shows another example of an air lift pump.

  Embodiments of the present invention will be described below with reference to the drawings. However, the Example shown below illustrates the stirring apparatus for actualizing the technical idea of this invention, Comprising: This invention does not specify a stirring apparatus to the following.

  Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

  2 and 3 show a specific example in which the stirring device is used in a device for stirring and aeration of sewage in a building drainage tank 21. FIG. However, since the stirrer of the present invention can also be used to efficiently stir the water in a stirring tank provided in a sewage treatment plant or a waterworks plant, its use is not specified for a building drainage tank. The stirrer of the present invention can be used for all purposes of stirring liquid stored in a stirring tank. In particular, it is optimal for applications where liquid is agitated while aerated.

  2 and 3 uses the agitation tank 1 as a building drainage tank 21 to agitate and aerate the sewage in the building pit 20. The building drainage tank 21 which is the building pit 20 prevents sludge accumulation by agitating the sewage with a stirrer, and further aerated to replenish oxygen to the sewage and decompose organic matter by the action of aerobic microorganisms. This prevents the generation of malodorous components such as hydrogen sulfide and methyl mercaptan. Malodorous components such as hydrogen sulfide generated in the building pit 20 leak from the manhole 22 and cause malodor, and when this is drained into the sewer 25, the sewer 25 is corroded. If the sewer 25 is corroded and perforated, a serious problem such as a road sinking occurs. For this reason, it is important for the sewage in the building pit 20 to prevent generation of malodorous components such as hydrogen sulfide.

  As shown in FIG. 2, the building drainage tank 21 drains the sewage stored here from the public basin 24 to the sewer 25 with the drainage pump 23. The agitation tank 1 in FIG. 3 includes an air lift pump 2 including a riser pipe 3 provided in the agitation tank 1 of the building drainage tank 21 and an air pump 4 that supplies air to the riser pipe 3.

  As shown in FIGS. 3 to 5, the air lift pump 2 includes a rising pipe 3 disposed so as to extend from the bottom of the agitation tank 1 to the level of the sewage liquid, and a lower portion of the rising pipe 3. And an air pump 4 for supplying air to the vehicle. The air lift pump 2 supplies air to the lower part of the ascending pipe 3 by the air pump 4. The ascending pipe 3 to which air is supplied raises the liquid by reducing the specific gravity of the liquid by air bubbles mixed in the liquid. The sewage is lifted up the ascending pipe 3 and forcibly stirred inside the building drainage tank 21 which is the stirring tank 1. Furthermore, the sewage is aerated by contacting countless bubbles in an agitated state, and oxygen is replenished.

  The ascending pipe 3 is a pipe that is open at both upper and lower ends, and is arranged vertically. The ascending pipe 3 can raise and stir the sewage most efficiently in a vertical posture. However, since the rising pipe can be arranged to be inclined to raise the sewage, it is not always necessary to arrange the rising pipe in a vertical posture. The ascending pipe separates the lower end from the bottom surface of the stirring tank and sucks the liquid at the bottom of the stirring tank.

  The ascending pipe 3 shown in FIGS. 3 to 5 has a structure in which a lower part is connected to the bottom plate 10 via a connecting arm 11 so that it can stand upright in a vertical posture. The bottom plate 10 is a metal plate, and has a size and a weight that allow the riser 3 to stand by itself inside the stirring tank 1. The bottom plate 10 has a size that can pass through the manhole 22 of the building drainage tank 21. The air lift pump 2 has a feature that it can be easily installed by being inserted into the building drainage tank 21 from the manhole 22. However, since the use of the stirrer of the present invention is not specified for sewage agitation and aeration in a building drainage tank, the size of the bottom plate can be optimized for each use. The ascending pipe 3 is disposed away from the upper surface of the bottom plate 10 via the connecting arm 11, and the lower end is opened as the suction port 7.

  The ascending pipe 3 includes a plurality of sub-rising pipes 30 arranged in parallel to each other. Air is supplied from the air pump 4 to each of the sub-rising pipes 30. Raise the liquid and stir. The ascending pipe 3 shown in FIGS. 4 to 6 is divided into a plurality of sub-rising pipes 30 by providing a partition wall 31 extending in the longitudinal direction inside. The ascending pipe 3 shown in the figure is partitioned into four sub-rising pipes 30 with a partition wall 31 having a cross-sectional shape fixed inside. The cross-shaped partition wall 31 is fixed with L metal fittings 32 so that the L-shaped partition walls 31A are orthogonal to each other at the corners. The L metal fitting 32 is fixed to the upper and lower sides of the L-shaped partition wall 31 </ b> A by a method such as screwing or bonding to form a cross-shaped partition wall 31. The cross-shaped partition wall 31 is bonded to the inner surface of the ascending pipe 3 or fixed via an L metal fitting or the like, thereby dividing the ascending pipe 3 into four sub-rising pipes 30.

  5 and FIG. 6, the cross-shaped partition wall 31 is fixed to the inner surface of the riser pipe 3 and the riser pipe 3 is divided into four sub-rise pipes 30. A partition wall may be provided to divide into 3 or less sub-rising pipes, or 5 or more sub-rising pipes. The partition wall that divides the rising pipe into two sub-rising pipes has a plate shape, and the partition wall 31 that divides into three sub-rising pipes 30 has an angle of 120 degrees as shown in FIG. In addition, the partition wall 31 partitioned into eight sub-rising pipes 30 has a structure in which eight plate members 31B are connected radially as shown in FIG.

  The ascending pipe 3 shown in FIG. 5 has a lower end of the partition wall 31 located above the lower end of the ascending pipe 3, and a collecting portion 33 that is not partitioned by the partition wall 31 is provided below the rising tube 3. Is provided with a suction port 7. Further, the ascending pipe 3 in this figure has an air injection pipe 35 fixed so as to inject air into the gathering portion 33. The air injection pipe 35 has a tip portion curved upward so as to inject air upward. The air jetted from the air jet pipe 35 to the collecting part 33 rises from the collecting part 33 to each sub-rising pipe 30 and raises the liquid in each sub-rising pipe 30.

  The ascending pipe 3 shown in FIGS. 4 to 6 is provided with one air injection pipe 35 in the collecting portion 33, and distributes and supplies the air injected from the air injection pipe 35 to each sub-rising pipe 30. Yes. The air injection pipe 35 is disposed upward in the center of the ascending pipe 3 and supplies air to be injected upward to each sub-rising pipe 30. As shown in FIGS. 9 to 11, the ascending pipe 3 can also be provided with a plurality of air injection pipes 35. 9 and 10 are provided with two air injection pipes 35, and the air injected from these air injection pipes 35 is distributed and supplied to four sub-rising pipes 30. Further, the ascending pipe 3 of FIG. 11 is provided with an air injection pipe 35 below each sub-rising pipe 30. The air injection pipe 35 supplies air to each sub-rising pipe 30.

  In the ascending pipe 3 shown in FIG. 12, the total length of the sub ascending pipe 30 is made shorter than that of the ascending pipe 3, and the gathering portion 33 is elongated vertically. The ascending pipe 3 is in the middle of the ascending pipe 3, and the air injection pipe 35 is connected to the collecting portion 33, and the air injection pipe 35 is disposed substantially above the lower end of the ascending pipe 3. The air lift pump 2 having this structure is installed in the deep agitation tank 1, and the discharge pressure of the air pump 4 can be lowered while agitation is performed so that liquid is sucked from the deep bottom of the agitation tank 1 and rises upward. This is because the discharge pressure of the air pump 4 is specified by the connection position of the air injection pipe 35, that is, the water depth. The air lift pump 2 supplies air injected from an air injection pipe 35 connected to the middle of the ascending pipe 3 to the sub ascending pipe 30, and the sub ascending pipe 30 ascends the liquid, so that the collecting part 33 The liquid can also rise.

  The ascending pipe 3 is provided with a discharge port 6 that is curved in the horizontal direction from the vertical direction. As shown in FIG. 5, the ascending pipe 3 can be connected to an elbow that is a joint 8 for a drain pipe, and can be provided with a discharge port 6 that ejects liquid in the horizontal direction. Since the discharge port 6 smoothly discharges the sewage discharged to the liquid surface from the vertical direction to the horizontal direction, the sewage can be efficiently discharged and stirred in the horizontal direction. The drain pipe joint 8 has a shape that is curved with a predetermined radius of curvature so that the discharge flows smoothly. As shown in FIG. 3, the ascending pipe 3 is installed on one side of a building drainage tank 21 that is a stirring tank 1, and injects sewage to be sucked toward the center to uniformly stir the whole.

  The ascending pipe 3 shown in FIG. 8 is provided with a pair of discharge ports 6 for discharging liquid sewage in different directions, in the drawing, in opposite directions. The ascending pipe 3 is connected to a joint 8 having a branching portion 8A that is curved in the horizontal direction toward both sides facing each other, and each discharge port 6 is provided. The ascending pipe 3 stirs the discharged liquid sewage in the horizontal direction in opposite directions. The ascending pipe 3 is installed in the central portion of the stirring tank 1 to efficiently stir the entire liquid.

  5 and FIG. 8, the upper end is curved from the vertical direction to the horizontal direction, and the discharge port 6 is opened in the horizontal direction. The ascending pipe 3 connects a joint 8 that is curved in the horizontal direction, and discharges both air and liquid from the discharge port 6. The ascending pipe 3 can efficiently agitate the liquid by disposing the upper discharge port 6 at the liquid level. This is because air and liquid are discharged in the same direction, and the liquid can be discharged efficiently and the discharge flow rate can be increased.

  The rising pipe 3 in FIGS. 7 and 9 has an upper end opened as an air vent 9. This ascending pipe 3 has a branch portion 8A that is curved in the horizontal direction, and has a joint 8 formed by opening an air vent 9 at the upper end connected to the upper end, while exhausting the rising air at the air vent 9 Then, the liquid rising together with the air is discharged from the discharge port 6 of the branch portion 8A in the horizontal direction.

Further, the ascending pipe 3 shown in FIG. 7 has a discharge port 6 provided with a branching portion 8A that bends at 90 degrees in the horizontal direction from the vertical direction at the joint 8 connected to the upper end. The ascending pipe 3 allows the liquid rising together with the air to pass through the branching portion 8A provided in the horizontal direction and is discharged from the discharge port 6 .
In addition, the riser, although not shown, may be provided with a pair of branch portions discharge ports by connecting the joint with the bent different horizontal directions. This ascending pipe discharges and stirs the sewage of the sucked liquid in the horizontal direction in opposite directions.

  The above ascending pipe 3 has a shape in which the upper discharge port 6 is bent or bent at approximately 90 degrees, but the ascending pipe does not necessarily have to bend or bend the discharge port at 90 degrees. It can be bent or bent to a smaller angle, or can be bent or bent to an angle greater than 90 degrees. The ascending pipe that curves or bends the upper discharge port can be bent or bent, for example, at an angle larger than 30 degrees and smaller than 90 degrees, and the liquid can be discharged in the horizontal direction and stirred.

  The ascending pipe 3 is connected to the air pump 4 via the air pipe 5 at the lower part. The pressurized air supplied from the air pump 4 is supplied to the ascending pipe 3 through the air pipe 5. The air supplied to the ascending pipe 3 becomes innumerable bubbles and is injected into the ascending pipe 3 to increase the specific gravity of the liquid in the ascending pipe 3 with a reduced specific gravity. The air pump 4 is a pump that can supply pressurized air to the bottom of the ascending pipe 3, and a diaphragm pump is used. The air pump 4 pressurizes and supplies air to the lower part of the ascending pipe 3 at a high pressure. Since the water depth is 1 m and the water pressure is 10 kPa, the agitation tank 1 having a maximum water depth of 1 m can supply liquid having a pressure higher than 10 kPa to the ascending pipe 3 to raise the liquid to the ascending pipe 3. For example, a diaphragm pump with a power consumption of 50 W has a discharge pressure of 11 kPa and an air flow rate of about 50 liters / minute. Therefore, using this diaphragm pump, the building drainage tank 21 has a maximum water depth of 1 m. The sewage can be efficiently stirred and aerated. However, a blower or a compressor can be used for the air pump. The blower has a feature that the flow rate of supplied air can be increased. Moreover, since a compressor can make discharge pressure high, it can be used conveniently for the stirring tank with a deep maximum water depth.

  The air pump 4 can increase the discharge pressure as the water depth of the agitation tank 1 becomes deeper and inject air into the rising pipe 3 in the form of bubbles. Therefore, the discharge pressure of the air pump 4 is set to an optimum value depending on the water depth of the stirring tank 1. The air lift pump 2 can increase the flow rate of the rising liquid by increasing the discharge flow rate of the air pump 4 and increasing the inner diameter of the ascending pipe 3. Accordingly, the inner diameter of the ascending pipe 3, the discharge flow rate and the discharge pressure of the air pump 4 are set so as to be optimal for the application.

Furthermore, the stirring device can supply the mixture to the riser 3 with an injector and mix the mixture with the liquid. The mixture is one of liquid, powder, gas, or a mixture of these. In the stirring apparatus shown in FIG. 13 , an injector 12 is connected to the rising pipe 3 to supply a liquid mixture to the bottom of the rising pipe 3. The injector 12 is a supply pump 13 that sucks a liquid mixture and sucks it into the ascending pipe 3. The mixture to be supplied from the supply pump 13 to the ascending pipe 3 is forcibly stirred and mixed with the liquid in the process of ascending the ascending pipe 3. This injector 12 is provided with a nozzle 14 upward at the bottom of the riser 3, and this nozzle 14 is connected to a supply pump 13. The injector 12 ejects the mixture from the nozzle 14 upward and mixes it with the liquid through the ascending pipe 3.

As shown in FIG. 14 , the injector 12 can also supply a liquid mixture in the middle of the air pipe 5. The injector 12 connects the supply hose 15 connected to the supply pump 13 to the air pipe 5 and supplies the mixture to the air pipe 5. In this stirring device, since the mixture is added to the air supplied to the riser 3, the air and the mixture are supplied together to the riser 3, and the mixture is mixed with the liquid in the riser 3. . The injector 12 described above supplies the liquid mixture to the riser 3. However, the gas mixture can also be supplied to the riser with the same structure, and can be mixed and dissolved in the liquid.

The stirring device of FIG. 15 mixes a powdery mixture into a liquid, and includes an injector 12 that supplies the powdery mixture to the riser 3. The injector 12 is connected to a supply pipe 17 connected to the powder tank 16 in the middle of the air pipe 5. The injector 12 sucks the powder mixture by an air ejector action in which the pressure is reduced by flowing through the air pipe 5 at a high speed, and the sucked powder mixture is supplied to the ascending pipe 3 using air as a carrier gas. Supply. The injector 12 can mix the mixture into a liquid without using a pump or the like that forcibly supplies the mixture to the riser 3. However, the powder mixture can be forcibly supplied to the riser and mixed with the liquid. The powdery mixture to be mixed with the liquid is dissolved in the liquid or uniformly dispersed without being dissolved.

DESCRIPTION OF SYMBOLS 1 ... Stirring tank 2 ... Air lift pump 3 ... Rising pipe 4 ... Air pump 5 ... Air piping 6 ... Discharge port 7 ... Suction port 8 ... Joint 8A ... Branch part 9 ... Air vent part 10 ... Bottom plate 11 ... Connecting arm 12 ... Injector 13 ... Supply pump 14 ... Nozzle 15 ... Supply hose 16 ... Powder tank 17 ... Supply pipe 20 ... Bill pit 21 ... Building drainage tank 22 ... Manhole 23 ... Drain pump 24 ... Public sewer 25 ... Sewer 30 ... Sub-rising pipe 31 ... partition wall 31A ... L-shaped partition wall
31B ... Plate material 32 ... L metal fitting 33 ... Collecting part 35 ... Air injection pipe

Claims (8)

A stirring device comprising a stirring tank (1) for storing a predetermined amount of liquid, and an air lift pump (2) for sucking the liquid in the stirring tank (1) from the bottom and discharging it to the top for stirring.
The air lift pump (2) is arranged in the agitation tank (1) so as to extend from the bottom to the liquid level, and a riser pipe having a suction port (7) at the bottom and a discharge port (6) at the top ( 3) and an air pump (4) for supplying air to the lower part or middle of the riser pipe (3),
The ascending pipe (3) is divided into a plurality of sub-rising pipes (30) by providing a partition wall (31) inside,
Furthermore, the partition wall (31) is a plate-like plate material (31B) extending in the longitudinal direction of the riser pipe (3), and the vertical cross-sectional shape is a radial shape,
The partition wall (31) divides the inside of the ascending pipe (30) into three or more sub-rising pipes (30) arranged in parallel to each other, and each sub-rising pipe (30) A stirrer provided with an air lift pump that is supplied with air from the air pump (4) to raise and stir the liquid in the stirring tank (1) with each sub-rising pipe (30).   The partition wall (31) is partitioned into four sub-rising pipes (30) by fixing the partition wall (31) having a cross-shaped cross section inside, and the cross-shaped partition wall (31 ) Is fixed with L metal fittings (32) so that the L-shaped partition walls (31A) are orthogonal to each other at the corners, and the cross-shaped partition walls (31) are connected to the riser pipe (3). A stirrer provided with an air lift pump according to claim 1, wherein the stirring device is fixed to the inner surface and divides the riser pipe (3) into four sub riser pipes (30). The lower end of the partition wall (31) is located above the lower end of the riser pipe (3), and a collecting portion (33) that is not partitioned by the partition wall (31) is provided at the lower part of the riser pipe (3). A stirring device comprising the air lift pump according to claim 1 .   The ascending pipe (3) is connected to the air pump (4) and includes an air injection pipe (35) for injecting air to the ascending pipe (3), and the air injection pipe (35) is connected to the ascending pipe ( The air jetted from the air jet pipe (35) is provided in the collective part (33) of 3), and rises from the collective part (33) and is branched and supplied to each sub-rising pipe (30). A stirrer comprising the air lift pump according to claim 3 formed as described above.   A plurality of air injection pipes (35) are provided in the collection part (33) of the riser pipe (3), and the air injected from each air injection pipe (35) to the collection part (33) A stirrer provided with an air lift pump according to claim 4, wherein the agitator is supplied to the ascending pipe (30).   Connected to the lower part of the riser pipe (3) is an injector (12) that injects a mixture of liquid, powder, gas, or a mixture thereof, and is supplied from the injector (12). A stirrer comprising an air lift pump according to any one of claims 1 to 5, wherein the mixture to be mixed is mixed with the liquid rising inside the ascending pipe (3).   The said injector (12) is equipped with the air lift pump described in Claim 6 connected in the middle of the air piping (5) which connects an air pump (4) and the said riser pipe (3). Stirring device.   8. The air lift pump according to claim 1, wherein the agitation tank (1) is any one of a building drainage tank (21), a water tank agitation tank, and a sewerage agitation tank. Stirring device.

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