CN211521764U - Underwater aeration stirring device with motor cooling function - Google Patents

Abstract

Provided is an underwater aeration stirring device having a motor cooling function, comprising a motor, an impeller rotated by the driving of the motor, and a discharge port for discharging a gas-liquid mixed water flow fed from the impeller. By generating water flow on the outer periphery of the motor, the heat generated by the motor can be efficiently dissipated, thereby alleviating overheating of the motor.

Description

Underwater aeration stirring device with motor cooling function

Technical Field

The utility model relates to an aeration stirring device in water, which is arranged in a water tank or a river of a drainage treatment facility and the like to carry out aeration stirring on discharged water in the water tank or water in the river.

Background

In order to improve the quality of discharged water or river water in a water tank of a wastewater treatment facility or the like, an underwater aeration stirring device is used which supplies oxygen to low-level water and forcibly generates convection between the low-level water and surface water. The underwater aeration stirring device is generally configured as described in the following patent document 1: the discharged water and the like are sucked by an impeller using a motor as a driving source, mixed with air supplied from an air supply pipe, and discharged from a discharge port to the outside of the underwater aeration stirring apparatus.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 3203336

Disclosure of Invention

The underwater aeration stirring apparatus described in patent document 1 has an outlet for discharging a gas-liquid mixed water flow in a radial direction. When the gas-liquid mixed water flow is discharged from the discharge port, a discharge flow is generated in the radial direction. The water flow is generated in the water tank by the discharge flow, and the gas-liquid mixed water flow is spread to the end of the water tank by riding on the water flow, and aeration can be reliably performed over a wide range.

In addition, a motor serving as a rotation driving source of the impeller is provided above the underwater aeration stirring device.

The purpose of the discharge flow is finally to diffuse the gas-liquid mixed water flow in the water tank or the like over as large a range as possible, and therefore the discharge flow is generated in a direction away from the underwater aeration stirring apparatus. The water flow generated in the water tank by the discharge flow reaches the wall surface or the water surface while being away from the underwater aeration stirring device, and then continues to move back. A part of the water flow reaches above the underwater aeration stirring device in a short time, but when the part of the water flow reaches above the underwater aeration stirring device, that is, the periphery of the motor, the water flow is decelerated by resistance.

The motor generates heat during operation. By radiating this heat to the outside of the motor, the occurrence of abnormal temperature rise in the motor can be reduced.

However, as described above, the water flow reaching the periphery of the motor is decelerated by resistance, and therefore the water flow does not sufficiently promote the heat transfer at the periphery of the motor. Therefore, there are the following problems: the heat generated by the motor is accumulated around the motor, and the insulating material inside the motor is deteriorated, so that the motor is damaged in a short period of time.

The present invention has been made in order to solve the above-mentioned problems occurring in the prior art, and an object of the present invention is to provide an underwater aeration stirring apparatus having a motor cooling function, which can efficiently dissipate heat generated by a motor by injecting a gas-liquid mixed water flow to the periphery of the motor and generating a water flow, thereby relieving overheating of the motor.

In order to achieve the above object, the present invention provides an underwater aeration stirring apparatus including a motor, an impeller rotated by driving of the motor, and a discharge port for discharging a gas-liquid mixed water flow fed from the impeller, wherein the underwater aeration stirring apparatus includes a cooling nozzle branched from the discharge port, the cooling nozzle spraying the gas-liquid mixed water flow toward the motor to generate a water flow in an outer periphery of the motor.

By this specific feature, the gas-liquid mixed water flow fed from the impeller is branched at the discharge port and the cooling nozzle, the gas-liquid mixed water flow is discharged from the discharge port, and the gas-liquid mixed water flow is also ejected from the cooling nozzle. Then, a water flow is generated around the periphery of the motor by the gas-liquid mixed water flow jetted from the cooling nozzle in the direction toward the motor.

Effect of the utility model

According to the utility model discloses an aquatic aeration agitating unit can make the heat that generates heat of motor high-efficiently scatter through the injection of rivers to alleviate the overheated of motor. Therefore, the following effects are provided: the deterioration of the insulating material due to overheating of the motor can be delayed, and the life of the motor can be extended.

Drawings

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

FIG. 2 is a longitudinal sectional view showing the underwater aeration stirring apparatus of FIG. 1.

FIG. 3 is a plan view showing the underwater aeration stirring apparatus of FIG. 1.

Fig. 4 is a perspective view showing the cooling nozzle.

Fig. 5 is a sectional view taken along line a-a of fig. 3.

Fig. 6 is a sectional view taken along line B-B of fig. 3.

Fig. 7 is a graph showing the surface temperature of the motor.

Description of the reference numerals

1 aeration stirring device in water

10 rotary power mechanism

11 Motor

12 speed reducer

13 rubber insulated cable

20 impeller

21 hub

21a air outlet

22 blade

30 pump casing

31 pump housing body

31a reinforcing rib

32 leg part

40 discharge casing

41 discharge casing body

411 discharge opening

412 upper guide plate

412a nozzle fixing part

413 lower guide plate

414 bulkhead

415 joining section

416 guide groove

417 support ring

42 cooling nozzle

421 nozzle body

421a fitting part

422 flange

423 jet port

424 fastening hole

43 Flange

50 air supply pipe

60 lifting appliance

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments.

FIG. 1 is a front view showing an underwater aeration/agitation apparatus 1 according to an embodiment of the present invention. Further, FIG. 2 is a vertical sectional view showing the underwater aeration and agitation apparatus 1, and FIG. 3 is a plan view showing the underwater aeration and agitation apparatus 1.

As shown in fig. 1 and 2, the underwater aeration stirring apparatus 1 includes: a rotary power mechanism 10 disposed at the upper part with its axis vertical; and an impeller 20 attached to the lower side thereof so as to be rotated by the rotation power mechanism 10. The impeller 20 is disposed in a pump casing 30 formed in a cylindrical shape, a discharge casing 40 is attached to an upper side of the pump casing 30, and the discharge casing 40 is provided with a plurality of discharge ports 411 extending in a radial direction. Hereinafter, each of the above-described components will be described in detail with reference to the rotary power mechanism 10.

-a rotary drive mechanism

As shown in fig. 2, the rotary power mechanism 10 includes: a motor 11 with a vertical axis; and a speed reducer 12 attached to an output shaft extending downward from the motor 11.

The motor 11 is disposed above the discharge casing 40. A rubber insulated cable 13 for supplying electric power to the rotation power mechanism 10 is connected to the upper side of the motor 11.

The speed reducer 12 is disposed in the discharge case 40 so as to be supported by the discharge case 40. The output shaft of the reduction gear 12 penetrates the center portion of the discharge casing 40 and reaches the inside of the pump casing 30. An impeller 20 is mounted on the output shaft of the reducer 12 within the pump housing 30.

Impeller-

The impeller 20 has: a cylindrical hub 21 surrounded by a pump housing 30, to which an output shaft of the speed reducer 12 is attached so that the output shaft of the speed reducer 12 is inserted upward; and a plurality of blades 22 arranged at equal intervals in the circumferential direction of the hub 21. The impeller 20 is rotated by power generated by driving the motor 11 being transmitted to the boss 21 via the output shaft of the motor 11, the reducer 12, and the output shaft of the reducer 12. The impeller 20 has a function of sucking up water from below the pump housing 30 by its rotational action and sending the water into the discharge housing 40.

The hub 21 and the blades 22 are each made of austenitic stainless steel, but are not limited thereto as long as they have excellent durability.

The boss 21 has an opening at the bottom, and an air supply pipe 50 for supplying air into the underwater aeration stirring apparatus 1 is inserted into the opening. A plurality of air discharge ports 21a are arranged at equal intervals in the circumferential direction on the upper peripheral surface of the boss portion 21. The air supplied from the air supply pipe 50 into the hub 21 passes through each air outlet 21a and is discharged into the pump housing 30.

Each blade 22 is formed to extend radially from the circumferential surface of the hub 21 with a large pitch angle so that a strong water flow flowing upward is generated by the rotation of the impeller 20.

Pump housing

The pump housing 30 has: a cylindrical pump housing body 31 having a diameter gradually increasing toward the lower side; and a plurality of legs 32 formed to extend downward of the pump housing body 31.

The pump housing body 31 is formed so that the upper surface and the lower surface are open. The outer peripheral surface of the pump housing body 31 is reinforced by a plurality of reinforcing ribs 31a arranged at equal intervals in the circumferential direction and extending in the vertical direction. The pump housing body 31 is formed of a cast iron material having excellent workability, but is certainly not limited thereto.

The leg portions 32 are arranged at equal intervals in the circumferential direction. The underwater aeration-agitation apparatus 1 is supported by the leg portion 32 so as to stand in the water tank. For example, the underwater aeration-agitation device 1 is supported by three leg portions 32, but the number of the leg portions 32 is not limited thereto. The length of the leg portion 32 is set so as to ensure a sufficient space for disposing the air supply pipe 50 from below the pump housing body 31 to the bottom surface on which the underwater aeration stirring device 1 is placed.

Discharge housing

The discharge casing 40 is attached to the upper side of the pump casing 30, and includes: a discharge casing body 41 provided with a plurality of discharge ports 411 extending in the radial direction; a plurality of cooling nozzles 42 arranged at equal intervals in the circumferential direction at the base end portion of the discharge casing body 41; a flange 43 fastened with the pump housing 30; and a hook member 44 to which the hanger 60 is locked.

The discharge casing body 41 is formed so that the upper surface and the lower surface are open. The discharge casing body 41 is made of a cast iron material having excellent workability, as in the pump casing body 31, but is certainly not limited thereto.

Each discharge port 411 is provided for discharging water fed from the impeller 20 into the discharge casing 40, and is an opening portion formed by: an annular lower guide plate 413; an annular upper guide plate 412 disposed upward of the lower guide plate 413 at an appropriate interval; and a plurality of partitions 414 that connect the upper guide plate 412 and the lower guide plate 413.

The lower guide plate 413 has an opening in an axial center portion thereof, and is formed to be inclined downward gradually toward the outside at an angle of about 5 to 40 degrees.

The upper guide plate 412 has a through hole in the center, and is disposed above the lower guide plate 413 substantially in parallel with the through hole at a constant interval. The inner peripheral side portion of the upper guide plate 412 is gently curved in an arc shape so as to face downward, and the inner peripheral edge thereof is positioned concentrically in the opening portion of the lower guide plate 413.

As shown in fig. 3, the upper guide plate 412 is divided into six equal parts by six pairs of partition walls 414 extending in the radial direction at six equal parts in the circumferential direction. The number of divisions may be changed as appropriate depending on the model and the like.

Each partition wall 414 is formed integrally with the upper guide plate 412 by being bent downward, and is formed so that a lower side edge thereof abuts against an upper surface of the lower guide plate 413. A coupling portion 415 that couples the inner peripheral portions of the partition walls 414 to each other is provided at the inner peripheral portions of the partition walls 414. The coupling portion 415 is curved in an arc shape with a large curvature so as to protrude toward the inner peripheral side, and is formed to be inclined by about 30 to 60 degrees so as to be located upward as it approaches the inner peripheral side.

The partitions 414 are opened upward and radially, and form guide grooves 416 extending in the radial direction.

A lower end edge of a circular truncated cone-shaped support ring (stay)417 is supported by an inner peripheral side bent portion of the upper guide plate 412. The support ring 417 is concentric with the through hole of the upper guide plate 412, and is formed so that its circumferential surface is inclined at about 45 degrees so as to be continuous with the coupling portion 415 of the partition 414. The upper and lower surfaces of the support ring 417 are open, and the decelerator 12 is interposed between the inner peripheral portion of the upper guide plate 412 and the support ring 417.

Fig. 4 is a perspective view showing the cooling nozzle 42. Fig. 5 is a radial cross-sectional view of the underwater aeration stirring apparatus 1 with the cooling nozzle 42 attached thereto, and fig. 6 is a circumferential cross-sectional view of the underwater aeration stirring apparatus 1 with the cooling nozzle 42 attached thereto.

As shown in fig. 3, the cooling nozzles 42 are disposed on the base end side of the surface of the upper guide plate 412 at trisections in the circumferential direction. By disposing the cooling nozzle 42 on the upper surface of the upper guide plate 412, a part of the water flowing between the upper guide plate 412 and the lower guide plate 413 is branched at the cooling nozzle 42, and is ejected as a jet flow from the cooling nozzle 42, unlike the discharge flow discharged from the discharge port 411. The cooling nozzle 42 is made of austenitic stainless steel, but is not limited thereto as long as the durability is excellent.

As shown in fig. 4, the cooling nozzle 42 has: a nozzle body 421 formed in such a manner that the upper end of the cylinder is gently curved; two flanges 422 provided diametrically opposite to each other at 180 degrees in the radial direction of the nozzle body 421; an ejection port 423 formed by the nozzle main body 421; and a fastening hole 424 provided so as to penetrate in the thickness direction of the flange 422.

As shown in fig. 4 and 5, the nozzle body 421 includes an upper portion and a lower portion having a cylindrical shape, and the upper portion is formed such that the central axis of the cylinder is gently curved to a predetermined angle so as to be away from the vertical axis. That is, the upper end of the nozzle body 421 is opened to be inclined in the radial direction, and the lower end of the nozzle body 421 is opened in the vertical axis direction.

The upper portion of the nozzle body 421 is bent at an angle such that water jetted from a jet port 423 described later is directed toward the motor 11 disposed above the underwater aeration stirring apparatus 1.

As shown in fig. 4, 5, and 6, a fitting portion 421a is provided at the lower end of the lower portion of the nozzle body 421, and the fitting portion 421a is fitted into a fitting hole provided in advance in the upper guide plate 412. In order to avoid concentration of stress on a connecting portion between the flange 422 and the nozzle main body 421, which will be described later, the outer periphery of the fitting portion 421a is formed smaller than the outer periphery of the lower portion of the nozzle main body 421.

As shown in fig. 4 and 6, two flanges 422 are provided on the outer periphery of the nozzle body 421 above the fitting portion 421 a. The one flange 422 is horizontally attached to the outer peripheral edge of the nozzle body 421 at a position rotated 90 degrees clockwise with respect to a direction in which the opening portion at the upper end of the nozzle body 421 is inclined in the radial direction. The other flange 422 is horizontally attached to the outer peripheral edge of the nozzle body 421 at a position rotated 270 degrees clockwise with respect to the direction in which the opening portion at the upper end of the nozzle body 421 is inclined in the radial direction. That is, the two flanges 422 are disposed diametrically opposite to each other at 180 degrees in the radial direction. The flange 422 is formed in a substantially rectangular shape having a width set smaller than the outer periphery of the lower portion of the nozzle body 421. Both corners at the tip end of the flange 422 are chamfered. The length of the flange 422 is set according to the position of a fastening hole 424 described later.

As shown in fig. 4, 5, and 6, the ejection opening 423 is an opening formed by the nozzle main body 421. A part of the water fed into the discharge casing 40 by the impeller 20 enters the nozzle body 421 by the water flow generated by the rotation of the impeller 20, and is directly ejected from the ejection port 423 to the outside of the underwater aeration stirring apparatus 1. Since the cross-sectional area of the nozzle body 421 is extremely smaller than the cross-sectional area of the path formed by the upper guide plate 412 and the lower guide plate 413 through which water passes, the water is accelerated when passing through the nozzle body 421 and is ejected from the ejection port 423.

As shown in fig. 4 and 6, the fastening holes 424 are two bolt fastening holes used when the cooling nozzle 42 is fixed to the surface of the upper guide plate 412, and one fastening hole penetrates each flange 422 in the thickness direction. The distance between the fastening holes 424 is set to correspond to the nozzle fixing part 412a provided in advance in the upper guide plate 412. The nozzle fixing portion 412a of the upper guide plate 412 is a through hole, and the cooling nozzle 42 is fixed to the surface of the upper guide plate 412 by fastening the flange 422 to the nozzle fixing portion 412a through the fastening hole 424 with a bolt. The nozzle fixing portion 412a is not limited to the above structure, and may be configured as a stud bolt, for example, which is inserted through the fastening hole 424 and fastened to the flange 422 by a nut.

The cooling nozzle 42 may be configured such that a part of the water flowing between the upper guide plate 412 and the lower guide plate 413 is branched at the cooling nozzle 42 and is ejected as a jet flow from the cooling nozzle 42 differently from the discharge flow discharged from the discharge port 411, and thus the shape and structure of the cooling nozzle 42 are not limited to the above shape and structure, and may be, for example, a complicated shape and structure. The cooling nozzle 42 may be a separate member attached to the upper guide plate 412 as described above, or may be integrally formed with the upper guide plate 412.

As shown in fig. 2, the flange 43 is provided on the inner peripheral edge of the lower surface opening of the discharge casing body 41 over the entire circumference. The flange 43 is placed on the upper surface of the pump housing body 31 over the entire circumference, and is fixed to the upper surface of the pump housing body 31 by bolts or the like.

As shown in fig. 3, the hook members 44 are attached to the upper surface of the upper guide plate 412 on one side of the guide grooves 416 arranged at a distance from each other out of all the guide grooves 416. As shown in fig. 1 and 2, the hook members 44 engage with the lower end of the hanger 60. The hanger 60 is locked with a wire rope or the like, and the whole underwater aeration stirring apparatus is lowered into a water treatment reaction tank or the like and placed on the bottom surface thereof.

In the above embodiment, the discharge casing 40 is attached to the upper side of the pump casing 30, but the present invention may be configured such that the discharge casing 40 is attached to the lower side of the pump casing 30, and water is sucked from the upper side of the pump casing 30 and discharged from the lower side. In the above embodiment, the motor 11 is disposed above the discharge casing 40, and the cooling nozzle 42 is opened upward toward the motor 11, but the present invention may be configured such that the motor 11 is disposed below the discharge casing 40, and the cooling nozzle 42 is opened downward toward the motor 11.

Based on the above embodiment, the present invention will be described in more detail with reference to the use examples of the underwater aeration stirring device of the present invention. However, the present invention is not limited to the following examples.

The underwater aeration stirring apparatus 1 described above is used in a state of being installed on the bottom surface of a water treatment reaction tank or the like. The impeller 20 disposed in the pump housing main body 31 is rotated by the driving of the motor 11 of the rotation driving mechanism 10. By the rotation of the impeller 20, water passes through the bottom surface, is sucked into the pump housing main body 31, and flows upward in the pump housing main body 31.

At this time, the air supplied from the air supply pipe 50 is discharged from the air discharge ports 21a provided on the upper peripheral surface of the boss portion 21. The air discharged from each air outlet 21a is diffused and mixed with the water flowing upward in the pump housing body 31. Since each air outlet 21a rotates coaxially with the blade 22, the air discharged from each air outlet 21a is finely sheared by the rotation action to be fine bubbles, and oxygen in the bubbles is efficiently dissolved in water.

Thus, the water in which the fine bubbles are dispersed rides on the water flow generated by the impeller 20, flows upward in the pump housing main body 31, and is introduced between the upper guide plate 412 and the lower guide plate 413 of the discharge housing 40. A part of the water is branched off from the three cooling nozzles 42 provided at the base end of the upper guide plate 412, and is directly sprayed from all the cooling nozzles 42 toward the motor 11 while riding on the water flow generated by the impeller 20. The other part of the water is bent outward in the radial direction by the upper guide plate 412 and is discharged obliquely downward in the radial direction from all the discharge ports 411 partitioned by the partition wall 414.

The jet flow ejected from each cooling nozzle 42 generates a water flow in the direction toward the motor 11. The jet flow ejected from each cooling nozzle 42 generates a water flow on the outer periphery of the motor 11, and the heat accumulated on the outer periphery of the motor 11 can be efficiently dissipated by the water flow, thereby reducing overheating of the motor. Therefore, deterioration of the insulating material due to overheating of the motor can be delayed, and the life of the motor can be extended.

As described above, the cooling nozzle 42 is configured such that a part of the water introduced between the upper guide plate 412 and the lower guide plate 413 is branched at the cooling nozzle 42 provided at the base end of the upper guide plate 412 and is ejected from the cooling nozzle 42 toward the motor 11 by the water flow generated by the impeller 20. Therefore, the cooling nozzle 42 has a simple structure and does not have a pump or the like separately for spraying water from the cooling nozzle 42, but can spray water.

The water discharged from all the discharge ports 411 flows along the bottom of the water treatment reaction tank or the like, and therefore the bottom of the water treatment reaction tank or the like is reliably stirred. Further, since the water and the air discharged from the discharge port 411 are efficiently mixed with each other, the entire water treatment reaction tank is efficiently and reliably aerated.

< temperature measurement experiment >

The internal temperature of the motor 11 and the surface temperature of the motor 11 were measured by using the above-described underwater aeration stirring apparatus 1. Before the cooling nozzle 42 was attached to the underwater aeration stirring apparatus 1 and after the cooling nozzle 42 was attached to the underwater aeration stirring apparatus 1, the internal temperature of the motor 11 and the surface temperature of the motor 11 were measured, respectively.

The internal temperature of the motor 11 was measured by measuring the coil temperature by the resistance method, and was measured once before the cooling nozzle 42 was attached to the underwater aeration stirring apparatus 1 and once after the cooling nozzle 42 was attached to the underwater aeration stirring apparatus 1.

The surface temperature of the motor 11 was measured by attaching a temperature measuring resistor sensor made of Pt100 to the surface of the motor 11, and was measured every 10 minutes.

Table 1 shows the results of measuring the internal temperature of the motor 11 of the underwater aeration-agitation apparatus 1. The internal temperature of the motor 11 before the cooling nozzle 42 was attached to the underwater aeration stirring apparatus 1 was 91.6 degrees, whereas the internal temperature of the motor 11 after the cooling nozzle 42 was attached to the underwater aeration stirring apparatus 1 was 52.3 degrees. That is, the internal temperature of the motor 11 is decreased by 39.3 degrees by installing the cooling nozzle 42.

[ TABLE 1 ]

Fig. 7 is a graph showing the surface temperature of the motor 11. As is clear from this figure, in the underwater aeration stirring apparatus 1 to which the cooling nozzle 42 is attached, the increase in the surface temperature of the motor 11 can be effectively suppressed as compared with the case where the cooling nozzle 42 is not attached.

From the above results, the following conclusions can be drawn: the water flow generated on the outer periphery of the motor 11 by the jet flow ejected from the cooling nozzle 42 promotes heat dissipation of the motor and suppresses overheating of the motor.

The above embodiments are illustrative in all respects and not to be construed as limiting. Therefore, the technical scope of the present invention is not to be interpreted only by the embodiments described above, but is defined by the claims. Further, the meaning and range equivalent to the claims are all included.

Claims (1)

1. An underwater aeration stirring apparatus having a motor cooling function, comprising a motor, an impeller rotated by driving of the motor, and a discharge port for discharging a gas-liquid mixed water flow fed from the impeller,

the underwater aeration stirring device has a cooling nozzle formed in a manner of branching from the discharge port,

the cooling nozzle sprays the gas-liquid mixed water flow toward the motor to generate a water flow on the outer periphery of the motor.

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