JP2000005792A - Underwater stirring aerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underwater stirring aerator with which installation and removal are easy. SOLUTION: This underwater stirring aerator has a submersible motor 17 which is operative by being submerged in the treated liquid in a treating vessel, a casing 15 which is connected with this submersible motor 17, an impeller 11 which is rotatably housed in this casing 15 and is constituted to be rotationally driven by the submersible motor 17 and an air supply pipe 21 which is fixedly connected at one end to the casing 15 and releases compressed air into the treating liquid passed through the inside of the casing 15 by the impeller 11. The air supply pipe 21 is so constituted that the pipe is substantially rigid and that the other end is substantially fixed to the treating vessel 26. The aerator has the air supply pipe 21 fixedly connected at one end with the casing. This air supply pipe 21 is substantially rigid and since the other end thereof is substantially fixed to the treating vessel, the air supply pipe 21 substantially rigidly fixes the casing to the treating vessel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stirring aeration apparatus, and more particularly to a stirring aeration apparatus having an air supply pipe.

[0002]

2. Description of the Related Art As a method for mixing a large amount of fine air into an aeration tank when treating a treatment liquid such as sewage with aerobic microorganisms in an aeration tank, as shown in FIG.
The mechanical underwater stirring and aerator 100 stirs the treatment liquid W1 in the aeration tank, and guides the air A from the outside of the aeration tank to the underwater stirring and aeration apparatus 100, mixes the inside of the processing liquid into the treatment liquid and enters the inside of the aeration tank. The method of release is adopted. FIG. 3A is a front view of a conventional underwater stirring aeration apparatus.

In this way, the processing liquid W2 sucked from the suction port 113 of the mechanical underwater stirring aeration apparatus 100 and discharged from the discharge port 112 contains a large amount of fine air A
2 is mixed. Processing solution W2 containing a large amount of this air
Spreads radially in a plane at the bottom portion 119 in the aeration tank, the processing liquid in the aeration tank is forcibly stirred, and air A mixed in the processing liquid W2 flows into every corner in the aeration tank. To activate aerobic microorganisms. Organic substances and suspensions in the processing solution are adsorbed and decomposed by the action of the microorganisms.

When such an underwater stirring aeration apparatus 100 is installed in an aeration tank, the aeration tank may be installed or installed in a state of being filled with a processing liquid. In case of mold, bottom 1 of aeration tank
In the case of a lower suction upper discharge type (not shown), it is not fixed with a bolt or the like on an upper part of a suction duct previously installed in the bottom of the aeration tank, although it is not shown. And set it up.

[0005] In the mechanical underwater stirring and aerating device 100, its impeller is driven by a submersible motor 117. In a steady operation state, the rotational torque is balanced, so that no force for rotating the device is generated. When starting and stopping, a torque imbalance occurs, and the underwater stirring and aeration apparatus 100
The whole rotates and moves under a slight rotational torque.

[0006]

In the conventional underwater stirring aeration apparatus 100 as described above, the underwater stirring aeration apparatus 100 is not fixed and installed in the aeration tank by bolts or the like, but is installed at the bottom 119 of the aeration tank. When the apparatus is operated on a mechanical structure (for example, a suction duct) which has been installed beforehand without being fixed with bolts or the like, the weight of the underwater stirring and aerating apparatus 100 is increased, or A guide pipe 121 and a guide pipe 131 serving also as an air supply pipe for fixing the underwater stirring and aerator are previously set around the installation position, and separately fixed to the casing 115 which is the main body of the underwater stirring and aerator. At the time of installation, a clamp section 132 is provided, and the clamp section of the underwater stirring / aeration apparatus 100 is placed above the processing liquid level at the time of installation.
, While sliding that part vertically downward,
The underwater stirring aeration apparatus 100 was set down by the hanging bracket 133. FIG. 3B is a view of the clamp portion as viewed from above, and shows the clamp portion 132 and the guide pipe 131.
3 shows the engagement state.

Here, the guide pipes 121 and 131 are
The upper part was fixed to the wall 126 of the aeration tank by pipe support fittings 125a and 125b, and the lower part was fixed to the bottom part 119 of the aeration tank. In such an installation method, it is necessary to add extra weight or to previously install guide pipes 121 and 131 firmly fixed to the wall or bottom of the aeration tank in order to suppress rotation and movement of the underwater stirring and aeration apparatus 100. there were.

Accordingly, an object of the present invention is to provide a stirring and aerator which can be easily installed and removed without requiring a special fixing guide pipe.

[0009]

In order to achieve the above object, a stirring and aerating apparatus according to the first aspect of the present invention can be operated by being immersed in a processing solution in a processing tank as shown in FIG. A motor 17; a casing 15 to which the motor 17 is connected;
An impeller 11 rotatably housed in a casing 15 and configured to be rotationally driven by a motor 17; an impeller 11 having one end fixedly connected to the casing 15
An air supply pipe 21 for discharging air into the processing liquid flowing through the casing 15 by the air supply pipe 21;
Is substantially rigid, and is configured such that the other end is substantially fixed to the processing tank 26. In particular, it is preferable to be fixed substantially rigidly in the rotation direction of the impeller.

According to this structure, the air supply pipe is fixedly connected at one end to the casing, the air supply pipe is substantially rigid, and the other end is substantially fixed to the processing tank. Thus, the air supply tube substantially rigidly fixes the casing to the processing tank.

According to a second aspect of the present invention, in the stirring and aerating apparatus according to the first aspect, at least a part of the center line of the air supply pipe is substantially coincident with the rotation center line of the impeller. Preferably. Here, at least a part of the center line of the air supply pipe is typically from the vicinity of the one end of the air supply pipe to the other end, i.e., the aeration device main body near the one end fixed to the casing, such as a motor. The distance from the attached supply pipe portion to the upper fixing point of the supply pipe.

With this configuration, since at least a part of the center line of the air supply pipe substantially coincides with the rotation center line of the impeller, a torque imbalance occurs around the center of the stirring and aerator. Even a slight rotation displacement does not lead to the parallel movement of the stirring and aerator.

Further, according to a third aspect of the present invention, in the stirring aeration apparatus according to the first or second aspect, the motor 1
7 has a rotating shaft 16; the impeller 11 may be mounted on the rotating shaft 16. This type is generally called an impeller direct connection type.

With this configuration, the impeller is mounted on the rotating shaft of the motor, typically directly, so that the agitating and aerating device is generally small and compact, and requires a small installation area. An air supply pipe fixedly connected at one end to the casing, the air supply pipe being substantially rigid and the other end being substantially fixed to the processing tank, so that a small and lightweight stirring and aeration can be achieved. Even in the apparatus, the air supply pipe fixes the casing substantially rigidly to the treatment tank, and can be stably installed in the aeration tank.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or corresponding members are denoted by the same or similar reference numerals, and duplicate description is omitted.

FIG. 1 is a partially sectional front view showing an underwater stirring and aerator 10 as a stirring and aerator according to a first embodiment of the present invention. In this embodiment,
This is the case where the center of the air supply pipe does not always coincide with the rotation center of the underwater motor or the impeller.

In the figure, an axial-flow type impeller 11 is mounted on a rotating shaft 16 whose central axis is directed vertically. Impeller 1
1 is accommodated in the casing 15 with a small gap between the tip of the impeller 11 and the inner surface of the casing 15.

In FIG. 1, the underwater stirring aeration apparatus 10 is installed at the bottom 19 of an aeration tank (processing tank) containing water as a processing liquid. Is only shown. Actually, a suitable number of feet (not shown) is provided in total of three to four or more.

Above the impeller 11 in the vertical direction, there is provided a submersible motor 17 as a motor that can be immersed in the processing liquid and operated. The motor shaft of the underwater motor 17 is common to the rotating shaft 16 in the present embodiment. That is, the impeller 11 is directly mounted on the motor shaft 16. For this reason, compared to an underwater stirring and aeration device having a reduction gear between the underwater motor 17 and the impeller 11, only the reduction gear is not provided, and only the rotation speed of the impeller 11 is high, so that it is configured to be small and compact. I have.

The casing 15 has a processing liquid suction port 13 opened in an annular shape toward the submersible motor 17. The casing 15 suctions the processing liquid water from around the submersible motor 17 and controls the water suction flow rate. It has a bellmouth shape to lower it.

Around the central axis of the impeller 11, below the impeller 11, an air chamber casing 15a has a truncated cone-shaped (Mt. Fuji-shaped) cross section, and the large circular surface of the truncated cone is vertically downward. It is provided for. The great circular surface of the truncated cone is open, and the center of the opening communicates with the air passage from the air inlet 14. The air introduced via the air inlet 14 is guided from the center of the great circular opening to the air chamber casing 15a, and further uniformly flows from the foot of Mt. Released during.

The air inlet 14 is provided with an air chamber casing 15.
The center opening of a is connected to the U-shaped air passage,
The casing 15 is provided outside the side of the casing 15 with its opening directed vertically upward. A flange 14a is fixed to the air introduction port 14 so that its surface is placed in a horizontal plane.

An air supply pipe 21 is connected to the flange 14a of the air inlet through a companion flange 21a. In the first embodiment shown in FIG. 1, the air supply pipe 21 extends vertically upward from the air inlet 14.

At the lower part of the vertical pipe portion of the air supply pipe 21, one end in the longitudinal direction of a rod-shaped or plate-shaped connecting member 41 is attached.
7 is fixedly attached to the upper end portion. In this manner, the air supply pipe 21 is fixed to the main body of the underwater stirring and aerating device 10 (a part mainly including the casing 15 and the motor 17 other than the air supply pipe 21) at the upper part of the motor. .

The upper end of the vertical pipe portion of the air supply pipe 21 and the portion of the aeration tank that is above the water surface are horizontally flanged.
1e is attached, and a flexible pipe 22 for air supply is connected to the flange 21e by a companion flange 22a. Beyond the flexible tube 22,
A blower and a blower (not shown) for forcibly sending compressed air to the air supply pipe 21 are provided. However, in the case of a submerged stirring aeration apparatus installed at a relatively shallow location in the aeration tank, the upper end of the vertical pipe portion 21d may be simply opened to the atmosphere. In this case, the underwater stirring aeration apparatus 10 is a so-called self-sufficient type.

The flexible pipe 22 allows the installation position of the underwater stirring and aeration apparatus 10 in the aeration tank to be freely changed without performing piping work. Note that a fixed tube may be used instead of the flexible tube 22.

A pipe support 25 is attached to the upper end of the vertical pipe portion of the air supply pipe 21 and below the flange 21e. The pipe support 25 is attached to the vertical pipe portion of the air supply pipe 21 so as to be fixed in the rotation direction at least with respect to the axis of the vertical pipe section, that is, to restrict the degree of freedom in the rotation direction.

The mounting may be fixed also in the vertical direction, that is, the mounting may restrict the degree of freedom in the vertical direction, but the vertical movement may be freely slidable up and down. If it is possible to slide in the vertical direction, the feet 18 can be firmly settled on the bottom 19 of the tank without hanging on the pipe support 15 when the underwater stirring aeration apparatus 10 is installed on the bottom 19 of the aeration tank. it can.

When the mounting is fixed in the vertical direction, that is, the mounting is such that the degree of freedom of movement in the vertical direction is restricted, the weight of the main body portion of the underwater stirring and aerating device 10 is so small that it cannot withstand buoyancy. Also, the buoyancy acting on the air supply pipe 21 itself can be fixed so as not to float.

The pipe support 25 is fixed to a foundation 26 on the side opposite to the side where the vertical pipe portion of the air supply pipe is mounted. The foundation 26 is generally a part of the aeration tank, is also a part of the ground together with the bottom 19, or is fixedly installed on the ground.

Referring to FIG. 2, a description will be given of a submersible aeration apparatus according to a second embodiment of the present invention. In this drawing, the motor 17 is shown without cross section. In the figure, an air supply pipe 21 is connected to a flange 14a of an air inlet through a companion flange 21a. In the second embodiment shown in FIG. 1, the air supply pipe 21 has a vertical pipe part 21 b extending vertically upward from the air inlet 14.
1b is the upper end of the underwater stirring and aerating device 10, which is horizontally bent at a height exceeding the upper end of the underwater motor 17 (the horizontal pipe portion is 21c), and the rotation axis of the motor 17 (the impeller 11) At the same time, it bends upward in the vertical direction again and extends upward along the vertical direction (this vertical pipe portion is referred to as 21d). The center axis of the vertical pipe portion 21 d substantially coincides with the rotation axis of the motor 17 or the impeller 11.

The lowermost part of the vertical pipe portion 21d, the motor 1
7, a flange 21df is provided in the horizontal direction, and a companion flange 21cf of the flange 21df is provided on the horizontal pipe portion 21c side, and the joined flanges 21cf, 21df are rod-shaped. Joining member 4
One end of 1a is fixedly attached. Joining member 4
The other end of 1 a is attached to the upper end of the motor 17. The center line of the rod-shaped joining member 41a substantially coincides with the rotation axis of the motor 17.

The joining member 41a is connected to the vertical pipe portion 21d.
Are arranged symmetrically with respect to the center line. In FIG. 2, 1
Although only a book is shown, a joining member 4 (not shown) is actually
Another 1a is provided.

As in the first embodiment, the pipe support 25 is attached to the vertical pipe section 21d of the air supply pipe 21. As described above, in any of the embodiments, the air supply pipe 21 has one end fixedly connected to the air inlet 14 of the casing 15 and the other end substantially connected to the base 26 which is a part of the processing tank. Fixed and substantially rigid.

In the embodiment shown in FIG.
A fixed pipe 27 for air supply is connected to e by a companion flange 27a. Beyond the fixed tube 27, the first
As described in the embodiment, a blower and a blower (not shown) are provided. When using the fixed tube 27,
The tube support 25 may be attached to the fixed tube 27. This is because the air supply pipe 2 fixed by the pipe support 25 starts from the air supply pipe section fixed by the connection member 41a.
This is because the portions 1d and 27 are substantially rigid. Further, a blower or a blower fixedly connected to the fixed pipe 27 is
The air supply pipe can be fixed to the foundation 26. In any case, the air supply pipe section from the air supply pipe section fixed by the connection member 41a to the section fixed to the blower or the blower may be substantially rigid.

The term "fixed connection" as used herein means a connection in which the degree of freedom of sliding and rotation is suppressed. The term “substantially fixed” refers to a mounting method in which the degree of freedom of sliding and rotation is suppressed. However, in the embodiment of the present invention, the rotation and movement of the underwater stirring aeration apparatus are suppressed, and installation and removal are easy. The main purpose is to reduce the degree of freedom, especially in the direction of rotation. The term “substantially rigid” means that a member that increases the degree of freedom of movement of a connected object in the middle, such as a flexible tube or the like, is mainly formed of a steel tube, a hard synthetic resin tube, a concrete tube, or the like without a member. Say.

With this configuration, the impeller 1
The underwater stirring and aerating device 10 can be maintained at a predetermined location against the rotational torque generated by the rotation of the underwater stirring and aerating device 10. In particular, even in the case of the lightweight underwater stirring and aerating device 10, it is possible to prevent the movement in the rotational direction or the accompanying horizontal movement.

In particular, in the second embodiment shown in FIG. 2, the upper end of the underwater stirring aeration apparatus 10 is located between the upper fixing point and the stirring aeration apparatus, that is, at least a part of the center line of the air supply pipe 21. The vertical pipe portion 21d between the portion attached to the portion by the connecting member and the portion attached to the foundation by the pipe support 25 is configured to substantially coincide with the rotation center line of the impeller 11, so that the underwater stirring is performed. Aeration device 1
Even if the torque is unbalanced around the center of 0 and the rotational displacement occurs, it does not lead to the parallel movement of the underwater stirring and aerator.

In the case of the second embodiment, the pipe 21d
Can pass through the aeration tank by using, for example, a pipe 21d to suspend the underwater stirring and aerating device 10 into and out of the aeration tank. At this time, the device can be moved up and down while maintaining the device in the vertical direction without tilting. Therefore, the installation and removal of the underwater stirring / aeration device 10 is extremely easy.

In both the first and second embodiments, the impeller 11 is mounted on the rotating shaft 16 of the underwater motor 17. It is a so-called impeller motor direct connection type. Such an underwater stirring and aerator is different from an underwater stirring and aerator provided with a speed reducer between the underwater motor 17 and the impeller 11, and requires only a small, compact and small installation area as a whole. The installation work is also easy because it is lightweight. Although it is lightweight, it is easily affected by the rotational torque of the impeller, but the substantially rigid air supply pipe 21 can prevent horizontal movement and can be stably installed in the aeration tank. be able to. Further, if the air supply pipe 21 is fixed also in the vertical direction, it is possible to prevent instability due to floating or the like of the lightweight underwater stirring and aerator.

As described above, in the underwater stirring aeration apparatus according to the embodiment of the present invention, the mechanical type in which the air is submerged in the treatment liquid in the aeration tank by a blower or a blower installed outside the aeration tank is operated. An air supply pipe of a mechanical underwater stirring and aeration device that guides the underwater stirring and aeration device and discharges it into the liquid downstream of the impeller, thereby mixing the fine air into the processing solution while stirring the processing solution in the aeration tank. Was installed on the center of the rotating shaft, and the air supply pipe was structured so as to also fix the underwater stirring / aeration apparatus.

In the above-described embodiment, the description has been made of the underwater stirring and aeration apparatus directly connected to the impeller motor. However, the present invention can also be applied to an underwater stirring and aeration apparatus having a speed reducer between the impeller and the motor.

[0043]

As described above, according to the present invention, an air supply pipe having one end fixedly connected to a casing is provided, the air supply pipe is substantially rigid, and the other end is connected to the processing tank. Since the casing is substantially fixed, the air supply pipe substantially rigidly fixes the casing to the processing tank, and it is possible to provide a submersible aeration apparatus that is easy to install and remove.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a submerged stirring and aeration apparatus according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a submersible aeration / aeration apparatus according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of a conventional underwater stirring and aeration apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Underwater stirring and aerator 11 Impeller 12 Processing liquid discharge port 13 Processing liquid suction port 14 Air introduction port 15 Casing 16 Rotating shaft 17 Underwater motor 18 Foot 19 Aeration tank bottom 21 Air supply pipe 22 Flexible pipe 22a Flange 25 Pipe support 26 Foundation 41 Connecting member

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Takeshi Kamei 11-1 Haneda Asahimachi, Ota-ku, Tokyo Inside Ebara Corporation (72) Inventor Mitsuhiko Ogasawara 11-1 Haneda Asahi-cho, Ota-ku, Tokyo Inside Ebara Corporation (72) Inventor Kaoru Endo 11-1 Haneda Asahimachi, Ota-ku, Tokyo Inside Ebara Corporation (72) Inventor Noriaki Sakai 11-1 Haneda Asahi-cho, Ota-ku, Tokyo Inside Ebara Corporation F Terms (reference) 4D029 AA09 AB01 AB05 BB10 CC07 4G035 AA01 AB10 AB14 AB18 AE07 AE11

Claims (3)

[Claims] A motor operable to be immersed in a processing solution in a processing tank; a casing connected to the motor; rotatably housed in the casing and rotatably driven by the motor. And an impeller that is fixedly connected at one end to the casing and discharges air into a processing liquid that flows through the casing by the impeller.
An air supply tube; wherein the air supply tube is substantially rigid, and the other end is configured to be substantially fixed to the processing tank; 2. The stirring and aerating apparatus according to claim 1, wherein at least a part of a center line of the air supply pipe is configured to substantially coincide with a rotation center line of the impeller. 3. The stirring and aerating device according to claim 1, wherein the motor has a rotating shaft; and the impeller is mounted on the rotating shaft.