JP3203336B2 - Underwater stirrer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underwater stirrer installed in a tank for purifying sewage such as sewage and used for stirring sewage.

[0002]

2. Description of the Related Art An underwater aeration stirrer for stirring and aerating sewage or the like usually employs an impeller disposed in a cylindrical pump casing as disclosed in Japanese Patent Application Laid-Open No. 6-285488. Water is sucked into the pump casing by being rotationally driven by a submersible motor or the like. While the water sucked into the pump casing flows through the inside of the pump casing, the supplied air is diffused separately, and the diffused water is discharged radially over the entire circumference of the pump casing. It is supposed to.

In the above publication, the impeller arranged in the pump casing sucks water from the upper side of the pump casing and discharges the water from the lower side. However, depending on the shape of the impeller of the impeller, the pump is It is also possible to suck water from the lower side of the casing and discharge it from the upper side.

The water flowing through the pump casing is introduced into the discharge casing and directed radially outward, and is discharged radially from a discharge port provided over the entire circumference of the discharge casing. I have.

[0005]

Since the discharge port provided in the discharge casing is provided over the entire circumference, the speed of the water discharged from the discharge port is reduced by diffusion and the water is easily attenuated. For this reason, there is a problem that water cannot be stirred over a wide range.

A plurality of vertically extending baffle plates for radially changing the swirling flow of water generated by the rotation of the impeller are provided at a discharge port provided over the entire circumference of the discharge casing. They are arranged at intervals. These baffle plates also function as reinforcing ribs connecting the upper and lower surfaces of the discharge casing.

[0007] Sewage such as sewage sucked into the pump casing contains scum and contaminants. Therefore, if a baffle plate, a reinforcing rib, or the like is provided in the discharge port, the water will There is a problem that the residue and the like mixed in the entanglement easily become entangled with these. When the residue or the like is entangled with the baffle plate or the reinforcing rib, water cannot be smoothly discharged from the discharge port, and the impeller and the submersible motor are overloaded, and the operation often becomes impossible.

Further, in order to prevent entanglement of residue or the like with the baffle plate, it has been practiced to remarkably increase the thickness of the plate and to form a tapered tip at an acute angle. With such a configuration, although the entanglement of the residue is somewhat improved, the baffle plate itself becomes an obstacle to the discharged water flow, and reduces the flow velocity of the discharged water flow. Moreover, in the thick part at the rear of the baffle plate arranged in the discharge water flow,
Karman vortices occur. Since such Karman vortices cause strong resistance to the flow of water, the flow velocity of the discharged water flow is further reduced, and the stirring power is significantly reduced.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a submersible stirring device capable of suppressing water from being discharged from a discharge port and reliably stirring water over a wide range. Is to provide. Another object of the present invention is to provide an underwater agitating device in which the discharge of water is not likely to be hindered by residues and contaminants mixed in the water.

[0010]

The underwater stirring device of the present invention is provided with a cylindrical pump casing, and is rotatably disposed in the pump casing. By rotating the pump casing, water is sucked into the pump casing. An impeller that allows the flow through the pump casing in the axial direction, a rotation drive mechanism for the impeller, and one end of the pump casing so that water flowing through the pump casing is introduced. And a short cylindrical discharge casing provided with a plurality of discharge ports for discharging water in a radial direction at appropriate intervals in the circumferential direction, and each discharge port of the discharge casing has a substantially radial direction. Are divided in the circumferential direction by a partition member having a pair of partition portions extending along the partition wall. The space between the partition portions of each partition member is opened upward and outward, and Characterized in that it forms a guide groove extending in a direction respectively.

The respective partition portions of the respective partition members are opened so as to be separated from each other toward the outer peripheral side.

The partition walls of each of the partition members are integrally connected at their inner peripheral sides by connecting portions projecting in an arc shape in the inner peripheral direction of the discharge casing.

Further, each discharge portion of the discharge casing is inclined obliquely downward at an angle of 5 to 40 degrees with respect to the horizontal direction.

In the underwater stirring device of the present invention, air is diffused into water flowing through the pump casing.

[0015]

In the underwater stirring device of the present invention, when the impeller in the pump casing is rotated by the rotary drive mechanism, water is sucked into the pump casing and flows in the pump casing in the axial direction. The water flowing through the pump casing is introduced into the discharge casing, and is discharged from a plurality of discharge ports circumferentially divided by each partition member.
The water discharged from each discharge port is divided by each partition member, becomes a bundle of water, and flows without attenuation over a wide range. When water is discharged from each discharge port, the water flows in the guide groove formed by each partition portion of each partition member, and forms a wake of the water discharged from each discharge port. As a result, there is no possibility that Karman vortex is generated at the side edge of the bundle of water discharged from each discharge port.

The partition portions of the partition members are separated from each other toward the outer peripheral side, so that dispersion of water discharged from each discharge port is suppressed.

The partition walls of the partition members are connected at their inner peripheral sides by connecting portions protruding in an arcuate shape having a large radius of curvature in the inner peripheral direction, so that water flowing through the discharge casing is formed. In addition, even if residue, contaminants and the like are mixed, there is no danger of entanglement, and water flows smoothly.

When air is supplied to the water flowing through the pump casing, the water into which the air is diffused is discharged from each discharge port of the discharge casing.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a front view showing an underwater aeration and stirring apparatus which is an example of the underwater stirring apparatus of the present invention, and FIG. 2 is a longitudinal sectional view thereof. The underwater aeration / agitating apparatus includes a rotation drive mechanism 10 disposed at an upper portion with a vertical axis, and an impeller 20 attached to a lower side of the rotation drive mechanism 10 so as to be rotated by the rotation drive mechanism 10 (see FIG. 2). Impeller 2
Numeral 0 is disposed in a cylindrical pump casing 30, and a short cylindrical discharge casing 40 provided with a plurality of discharge ports 41 extending along the radial direction is attached to the upper side of the pump casing 30. ing.

As shown in FIG. 2, the rotation drive mechanism 10
It has a submersible motor 11 whose axis is in a vertical state, and a reduction gear 12 attached to an output shaft extending below the submersible motor 11 and arranged in a discharge casing 40. Output shaft penetrates the center of the discharge casing 40 and reaches the inside of the pump casing 30. The speed reducer 12 of the rotation drive mechanism 10 is supported by the discharge casing 40. An impeller 20 is attached to an output shaft of the speed reducer 12 located in the pump casing 30.

The impeller 20 has a cylindrical boss 21 attached to the output shaft of the speed reducer 12, and the boss 21 rotates when the underwater motor 11 of the rotary drive mechanism 10 is driven. Is done. The impellers 2 arranged at equal intervals in the circumferential direction are provided on the peripheral surface of the boss portion 21.
2 are provided. Each impeller 22 has a large pitch angle and extends radially from the peripheral surface of the boss 21 so that a strong upward water flow is generated by the rotation of the boss 21.

The pump casing 3 surrounding the impeller 20
Numeral 0 has a cylindrical casing body 31 whose diameter is gradually increased toward the lower side, and the upper and lower surfaces of the casing body 31 are open. Casing body 3
1 is reinforced by a plurality of vertically extending reinforcing ribs 33 arranged at equal intervals in the circumferential direction. On the lower surface of the casing body 31, for example, three legs 32 extending downward are arranged at equal intervals in the circumferential direction, and the lower surface of the casing body 31 is It is in a state of being appropriately spaced from the bottom surface on which the processing reaction tank and the like are installed.

When the impeller 20 disposed in the casing body 31 of the pump casing 30 is rotated, water is sucked into the casing body 31 from the open lower surface thereof by the impellers 22, and the casing body 31 is rotated. Part 31
It flows through inside.

An air supply pipe 50 is inserted through a lower axial center of the boss 21 of the impeller 20 disposed in the pump casing 30. On the upper peripheral surface of the boss portion 21,
A plurality of air discharge ports 21b are arranged at equal intervals in the circumferential direction, and air supplied from the air supply pipe 50 passes through each air discharge port 21b and passes through the pump casing 3b.
0 is discharged into the casing main body 31.

FIG. 3 is a partially cutaway plan view of the discharge casing 40 disposed above the pump casing 30, and FIG. 4 is a sectional view taken along line AA of FIG. As shown in FIG. 4, the discharge casing 40 has an opening 42a at the center.
Are provided, and an upper guide plate 43 disposed above the lower guide plate 42 at an appropriate distance from the lower guide plate 42.

The lower guide plate 42 is inclined downward at an angle of about 5 to 40 degrees around the opening 42a provided in the axial center portion toward the outside. The inner peripheral edge of the periphery of the opening 42a is curved in an arc shape with a small curvature downward, and a flange portion 44 extending horizontally outward is provided at the lower end portion over the entire periphery. Have been. The flange portion 44 is mounted on the entire upper surface of the casing body 31 of the pump casing 30 and is bolted to the upper surface of the casing body 31 of the pump casing 30.

The upper guide plate 43 has a through hole 43a at the center.
Are provided, and are arranged substantially parallel above the lower guide plate 42 with a constant interval. An inner peripheral portion of the upper guide plate 43 around the through hole 43a is gently curved in an arc shape so as to extend downward, and an inner peripheral edge thereof is concentric with the opening 42a of the lower guide plate 42. Located in state.

As shown in FIG. 3, the upper guide plate 43 is provided with radially extending partition members 46 at six equally spaced positions in the circumferential direction.
Is divided into six equal parts. The number of divisions may be changed as appropriate according to the model or the like. Each partition member 46 has a pair of partition portions 46a extending substantially in the radial direction between the lower guide plate 42 and the upper guide plate 43. Each partition 46
a is formed by being bent downward integrally with the upper guide plate 43, and the lower edge thereof is formed by the lower guide plate 42.
Is in contact with the top surface of the

The inner peripheral side portion of the partition member 46 is
The connecting portion 46b connects the inner peripheral side portions of 6a. The connecting portion 46b is protruded inwardly.
It is curved in a circular arc shape with a relatively large curvature, and is inclined at about 30 to 60 degrees so as to be located upward as it approaches the inner peripheral side.

A guide groove 45, which is open upward and outward and extends in the radial direction, is formed between the partition walls 46a.

Portions of each partition member 46 surrounded by the partition portion 46a, the lower guide plate 42, and the upper guide plate 43 are discharge ports 41 of water that is flowed upward by the impeller 20, respectively.

The partition walls 46a are successively opened apart from each other toward the outer peripheral side. Therefore, the guide groove 45 formed between the partition walls 46a is formed by the lower guide plate. The width dimension increases toward the outer peripheral side of 42. As a result, in each of the discharge ports 41 defined by one of the partition portions 46a of the adjacent partition members 46, the middle of the radial direction is expanded in the circumferential direction, and the respective discharge-side end portions are positioned on the outer peripheral side. As it gradually becomes smaller, it gradually narrows in the circumferential direction.

A lower end edge of a truncated conical stay 48 is supported on the inner guide side curved portion of the upper guide plate 43. The stay 48 is provided with a through hole 43a of the upper guide plate 43.
And the peripheral surface is inclined at about 45 degrees so as to be continuous with the connecting portion 46b of each partition member 46. The upper surface and the lower surface of the stay 48 are open, and the underwater motor 11 in the rotary drive mechanism 10 operates in a vertical state with the output shaft facing downward.
It is connected to. The speed reducer 12 to which the underwater motor 11 is connected is located in the stay 48 and the through hole 43 a of the upper guide plate 43.

A hook member 49 is attached to the upper surface of the upper guide plate 43 located on one side of every other guide groove 45 among all the guide grooves 45. As shown in FIGS. 1 and 2, each hook member 49 is configured such that a lower end portion of a hanging member 60 is locked. A wire rope or the like is locked to the hanging member 60, and the underwater aeration is performed. The whole stirring device is lowered into the inside of a water treatment reaction tank or the like and is installed on the bottom surface thereof.

When the underwater aeration and stirring device having such a configuration is installed on the bottom surface of a water treatment reaction tank or the like, the underwater motor 11 of the rotary drive mechanism 10 is driven. Thereby, the impeller 20 arranged in the casing body 31 of the pump casing 30 is rotated. By the rotation of the impeller 20, water is sucked through the bottom surface into the casing main body 31 of the pump casing 30, and the casing main body 31
Flows upward in the interior.

At this time, the air supplied from the air supply pipe 50 is discharged from each air discharge port 21b provided on the upper peripheral surface of the boss 21. And each air outlet 21b
Is diffused and mixed into the water flowing upward through the casing body 31 of the pump casing 30. Since each of the air discharge ports 21b rotates coaxially with the impeller 22, the air discharged from each of the air discharge ports 21b is finely sheared by the rotation action to form fine bubbles, and oxygen in the bubbles is efficiently removed from the water. Dissolved in

The water in which the fine bubbles are diffused as described above flows upward in the casing body 31 of the pump casing 30, and the lower guide plate 42 of the discharge casing 40.
And between the upper guide plate 43 and the upper guide plate 43, are bent outward in the radial direction, and are ejected obliquely downward in the radial direction from all the discharge ports 41 partitioned by the partition members 46. You.

The water discharged from all the discharge ports 41 flows along the bottom of the water treatment reaction tank or the like, so that the bottom of the water treatment reaction tank or the like is reliably stirred. In addition, since the water discharged from the discharge port 41 is efficiently mixed with air, the bottom of the water treatment reaction tank or the like is efficiently and reliably aerated.

Each of the discharge ports 41 is partitioned by a partition wall member 46, and furthermore, the outer peripheral end is slightly narrowed in the circumferential direction toward the outer peripheral side. Then, a bundle of water streams is discharged from each discharge port 41. As a result, since the water flow discharged from each discharge port 41 is suppressed from being dispersed, the damping action is reduced, and the water flow can reach a long distance.

Since a guide groove 45 opened upward and outward is provided between each discharge port 41, when a water stream is discharged from each discharge port 41, the guide groove 45 extends along each guide groove 45. The surrounding water flows. Since each guide groove 45 is widened toward the outer peripheral side, the water passing through the guide groove 45 smoothly flows in the radial direction together with the water discharged from each discharge port 41, and A wake is formed at each side edge of the water flow discharged from the outlet 41 without generating Karman vortices. As a result, the discharge port 41
The water stream discharged from the water treatment vessel has a large width without being hindered by the Karman vortex, so that the bottom of the water treatment reaction tank is surely stirred over a wide range.

The water that has flowed into the discharge casing 40 is smoothly divided into the respective discharge ports 41 by the arc-shaped connecting portions 46 b of the partition member 46. Further, the arc-shaped connecting portion 46 b prevents entanglement, residue, and the like mixed in the water flowing into the discharge casing 40 from getting entangled in the partition wall member 46. Therefore, the water is smoothly discharged from each discharge port 41, and the impeller 20, the underwater motor 11, and the like are not overloaded.

Further, the partition member 46 includes a pair of partition portions 46.
Due to having a, the entire discharge casing 40 is reinforced by the partition walls 46a, and the strength of the discharge casing 40 is significantly improved.

In the above embodiment, the discharge casing 40 is mounted on the upper side of the pump casing 30. However, in the present invention, the discharge casing 40 is mounted on the lower side of the pump casing 30, Water may be sucked from and discharged from below.

[0045]

As described above, the underwater stirring device of the present invention has the following features.
Since the discharge casing is divided into a plurality of discharge ports by the partition member, water is discharged from each discharge port as a bundle of water flows. As a result, attenuation of the water flow discharged from each discharge port is suppressed, and each water flow can stir water over a wide area. In addition, since the pair of partition portions of each partition member form a guide groove that is open upward and outward, the water flow discharged from each discharge port causes Since a wake that flows through the guide groove is generated, the water flow from each discharge port is not attenuated by the Karman vortex, and the stirring effect is further improved by the wake effect.

Since the partition walls of each partition member converge the bundle of the water flow discharged from the discharge port, attenuation of the water flow is further suppressed, and the water can be stirred over a wider range. .

Further, since the inner peripheral portions of the respective partition portions of the respective partition members are connected by connecting portions projecting inwardly in an arc shape, the inside of the water divided into the respective discharge ports is formed. There is no possibility that the residue, the contaminants, etc. are entangled in each partition member, and the water can be discharged smoothly.

By adding an aeration function for diffusing air to the discharged water, it is possible to perform aeration over a wide range.

[Brief description of the drawings]

FIG. 1 is a front view of an underwater aeration apparatus as an example of an underwater stirring apparatus according to the present invention.

FIG. 2 is a longitudinal sectional view of the underwater aeration apparatus.

FIG. 3 is a partially cutaway plan view of a discharge casing used in the underwater aeration apparatus.

FIG. 4 is a cross-sectional view taken along line AA of FIG.

[Explanation of symbols]

 10 rotation drive mechanism 11 underwater motor 12 speed reducer 20 impeller 21 boss 21b air discharge port 22 impeller 30 pump casing 31 casing main body 40 discharge casing 41 discharge port 42 lower guide plate 43 upper guide plate 45 guide groove 46 partition member 46a Partition 46b Connecting part

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shigehiro Endo 3417 Miho, Shimizu-shi, Shizuoka (72) Inventor Tetsuya Morita 1-1-1 Kasugaitakita, Konohana-ku, Osaka-shi, Osaka (56) References JP-A-6 285 488 (JP, A) JP-A 1-167400 (JP, U) JP-A 56-39197 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B01F 3/04

Claims (5)

(57) [Claims] A pump casing having a cylindrical shape, rotatably disposed in the pump casing,
An impeller that draws water into the pump casing by rotating to flow in the axial direction, a rotation drive mechanism of the impeller, and a pump casing that introduces the water flowing through the pump casing. A short cylindrical discharge casing attached to one end and provided with a plurality of discharge ports for discharging the introduced water in the radial direction at appropriate intervals in the circumferential direction; Each discharge port of the casing is divided in the circumferential direction by a partition member having a pair of partition portions each extending substantially along the radial direction, and a space between each partition portion of each partition member is upward and outward. Open to the public
An underwater stirring device, wherein guide grooves extending in a radial direction are formed. 2. A partition section of each partition member,
The underwater stirring device according to claim 1, wherein the underwater stirring device is opened so as to be apart from each other as it is closer to an outer peripheral side. 3. A partition section of each partition member,
The underwater stirring device according to claim 1, wherein the inner peripheral side portions are integrally connected by a connecting portion projecting in an arc shape in the inner peripheral direction of the discharge casing. 4. The underwater stirring device according to claim 1, wherein each discharge port of the discharge casing is sequentially inclined downward at an angle of 5 to 40 degrees with respect to a horizontal direction toward an outer peripheral side. 5. The underwater stirring device according to claim 1, wherein air is diffused into water flowing through the inside of the pump casing.