JP2001137886A - Aeration device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aeration device for easily realizing maintenance, and for ejecting waste water containing air bubbles after sufficiently rectifying it. SOLUTION: A driving part A constituted by mounting an impeller 8 on the top end of a motor shaft 13 is fixed to a device casting B. A cover part 54 water-tightly covering the flange part 61 of a diffuser 60 is formed at the lower edge part of the device casing B. A device body part C constituted of the driving part A and the device casing B is guided by a guide pipe 78 and a guide bar 77 and placed on the diffuser 60 in a non-fixed state. The diffuser 60 if formed in a rectangular flat shape as it approaches the downstream side, and mixed liquid is rectified and ejected in a horizontal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aeration apparatus used for purifying sewage and the like.

[0002]

2. Description of the Related Art Conventionally, an axial impeller connected to a shaft of a submersible motor is housed in an apparatus casing, and sewage is sucked into a flow passage by rotation of the axial impeller, and air is supplied to the sewage. 2. Description of the Related Art Aeration devices that supply and aerate are known.

Conventionally, when performing sewage treatment such as the oxidation ditch method, this type of aeration device is provided inside an endless oval water channel. And, for example, as disclosed in Japanese Patent Publication No. 2-32957,
The discharge diffuser that leads out the agitated and mixed air and sewage was formed of concrete, like the wall of the water channel. Further, the air diffuser and the device casing for supplying air to the sewage have been fixed to the concrete wall by anchor bolts or the like. The driving unit having the rotating impeller has been fixed to a support provided at the upper part of the water channel.

[0004]

However, in the above-described aeration apparatus, since the driving unit is fixed to the support, it is necessary to remove a fixing tool (bolt or the like) in order to take out the driving unit during maintenance. Yes, and the fixture had to be fixed again when re-installed. Therefore, much time and labor were required for maintenance.

On the other hand, the diameter of the air diffuser is generally set to be smaller in order to increase the oxygen dissolving efficiency. As a result, the air diffuser is easily clogged with sludge,
In order to remove the clogging of the air diffuser, it is necessary to periodically perform a cleaning operation. However, in the above-described aeration apparatus, since the diffuser is fixed to the concrete wall, the cleaning operation cannot be performed unless the water level of the water channel is lowered.

Further, in the above aeration apparatus, since the discharge diffuser is manufactured from concrete, the manufacturing period is prolonged and the manufacturing cost is increased.

Furthermore, since a part of the discharge diffuser also serves as a baffle wall that separates the upstream and downstream sides of the water channel, it is structurally difficult to ensure a sufficient diffuser length.
Rectification of the discharge flow was likely to be insufficient. Therefore, the flow velocity and the flow rate of the discharge flow may decrease.

The present invention has been made in view of the above points, and an object of the present invention is to provide an aeration apparatus which is easy to maintain, and which can discharge after sufficiently rectifying the discharge flow. To provide.

[0009]

In order to achieve the above-mentioned object, the present invention is to mount the main body in a non-fixed state on a diffuser so that the main body can be easily attached and detached. . Further, instead of forming a diffuser by a part of the water channel, a separate diffuser independent of the water channel is provided.

Specifically, the first invention is an apparatus for partitioning a drive section having a rotating impeller, and a stirring flow path for stirring and mixing the liquid to be treated sucked by the rotation of the impeller with a predetermined gas. A casing, and a diffuser that forms a discharge flow path for discharging the predetermined gas and the liquid to be processed that have been stirred and mixed, the drive unit and the device casing are fixed to each other to form a main body, The main body is mounted on the diffuser in a non-fixed state such that the stirring flow path and the discharge flow path are continuous.

[0011] With this, during maintenance,
The removal of the main body can be completed simply by lifting the main body. Further, the mounting operation of the main body can be completed only by placing the main body on the diffuser. Therefore, maintenance becomes easy. Furthermore, since a diffuser for supporting the main body is provided, the manufacturing period of the device can be shortened and the manufacturing cost can be reduced as compared with a conventional device in which a part of a water channel is a diffuser. In addition, since the diffuser is formed separately from the water channel, its shape and dimensions can be set freely,
The discharge amount can be sufficiently rectified.

According to a second aspect, in the first aspect,
A guide rail extending in the vertical direction, provided on the main body,
A guide member that engages with the guide rail so as to guide the vertical movement of the main body.

With this arrangement, when the main body is moved between the predetermined removal position and the predetermined mounting position on the diffuser, the main body is guided by the guide members and the guide rods, so that complicated positioning is required. No work is required. Therefore, maintenance becomes easier.

In a third aspect based on any one of the first and second aspects, the flow path of the predetermined mixed gas and the liquid to be treated is curved from the vertical direction to the horizontal direction. Is formed as described above.

[0015] Thus, the discharge flow obtained by stirring and mixing the liquid to be treated and the predetermined gas is discharged in a horizontal direction parallel to the bottom of the water channel.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the discharge flow path has a horizontally long flat shape toward the downstream side.

As a result, the discharge flow formed by stirring and mixing the liquid to be treated and the predetermined gas is discharged in a manner spread in the horizontal direction and becomes a uniform discharge flow over a wide range. Also,
Since the flow velocity at the bottom of the tank can be particularly increased, sedimentation of sludge can be efficiently prevented.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, the apparatus casing is provided with a diffuser port for supplying a predetermined gas to the liquid to be treated. Things.

Thus, since the air diffuser is provided in the main body, the diffuser can be taken out by simply pulling up the main body, thereby facilitating the cleaning operation of the air diffuser.

[0020] In a sixth aspect based on the second aspect,
At least a part of the guide rail is formed by a guide pipe through which a predetermined gas flows, and at the tip of the guide pipe, a first flange portion having a first air supply port that opens upward is provided. An air supply pipe having a second air supply opening formed at a tip thereof and opening downward so as to correspond to the first air supply opening, and having a second flange portion mounted on the first flange portion. And a diffuser port for supplying a predetermined gas introduced from the air supply pipe to the liquid to be treated is formed.

As a result, the configuration of the apparatus is simplified because the guide pipe also serves as an introduction pipe for introducing a predetermined gas from the outside and a guide rod. In addition, since the second flange portion of the air supply pipe is placed on the first flange portion of the guide pipe, a flow passage of a predetermined gas from the guide pipe to the air diffuser of the device casing is formed. Therefore, the flow path of the predetermined gas is automatically formed only by placing the main body on the diffuser, so that the maintenance is further facilitated. Further, as in the fifth aspect, the work of cleaning the air diffuser is facilitated.

According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the diffuser is formed of a metal.

As a result, the degree of freedom in designing the diffuser is increased, and the manufacturing period and the manufacturing cost are reduced.

[0024]

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

As shown in FIG. 1, the aeration apparatus 20 according to the present embodiment uses an oxidation ditch method (an oxidation groove method).
It is used for sewage treatment. That is, in the endless water channel 90, the activated sludge is mixed with the sewage, air is supplied to the mixed liquid (the liquid to be treated) to dissolve oxygen in the air, and is used to flow and circulate in the water channel 90. Things.

The water channel 90 has a concrete outer wall 91,
It consists of a partition wall 92 and a bottom wall 93 and is formed in an endless oval shape. The aeration device 20 is installed in the water channel 90, and the diffuser 60 is opened along the flow path on the right side in the drawing so as to flow a mixture of the waste water and the activated sludge in a counterclockwise direction.

-Structure of Aeration Device- As shown in FIGS. 2 to 4, the aeration device 20 is a so-called underwater mechanical type aeration device, and includes the underwater motor 2. The device casing B of the aeration device 20 is integrally formed by mounting and fixing the suction casing 9 on the discharge casing. The suction casing 9 is formed in a substantially cylindrical shape, and has a divergent shape toward the upper opening in order to smoothly suck the mixed liquid.

The discharge casing 10 includes the suction casing 9
An inner cylindrical portion 50 having an upper opening having substantially the same shape as the lower opening, and an outer periphery of the inner cylindrical portion 50 is formed so as to define a vertically elongated band-shaped air chamber 52 between the inner cylindrical portion 50 and the inner cylindrical portion 50. Outer cylinder part 51
And The upper edge of the outer cylinder 51 is in contact with the lower edge of the suction casing 9. A gap is provided between the upper edge of the inner cylinder 50 and the lower edge of the suction casing 9, and an annular air diffusion port 53 for supplying the air in the air chamber 52 to the mixed liquid over the entire circumference. Are formed. Air diffuser 53
Is formed by a slit opening having an upper and lower gap interval of 5 mm to 20 mm, and blows air into a mixed liquid immediately after the impeller 8 in a film shape.

As shown in FIG. 3, an air inlet 56 that opens in the horizontal direction is formed in a part of the outer cylindrical portion 51 of the discharge casing 10. And, in this outer cylinder part 51,
An air supply pipe 55 having a flange 83 having a horizontal opening continuous with the air inlet 56 is attached. The air supply pipe 55 is curved vertically downward from the horizontal direction from the downstream end where the flange portion 83 is provided to the upstream side, and a flange portion 82 having a downward opening is provided at the upstream end. .

The lower end of the discharge casing 10 is provided with a flange 61 provided around the upper opening of the diffuser 60.
It is formed in a hat shape so as to cover. That is,
A lower end portion of the discharge casing 10 serves as a lid portion 54, and a flange portion 57 that contacts the flange portion 61 of the diffuser 60.
Once spread radially outward to form
It extends downward so as to form a side surface portion 58 that is in close contact with the outer peripheral surface of the flange portion 61, and further spreads downward and downward so as to form an inclined portion 59 that extends obliquely downward. The suction casing 9 and the discharge casing 10 define a stirring channel 41 for stirring and mixing the mixed solution with air.

The diffuser 60 rectifies the mixed liquid and air in the stirring channel 41 and discharges the air into the water channel 90.
Are formed in an L-shape such that the flow direction of the discharge flow path 42 is curved in a horizontal direction from a vertically downward direction. The upper opening of the diffuser 60 is formed in the same shape and the same size as the lower opening of the discharge casing 10, and the stirring channel 41 and the discharge channel 42 are smoothly continuous. As shown in FIG. 3, the diffuser 60 has a horizontally elongated flat shape toward the downstream side. That is, the cross-sectional shape of the diffuser 60 changes from a circular shape to an elliptical shape or a substantially rectangular shape toward the downstream side. Therefore, the discharge port 62 of the diffuser 60
Has a flat shape along the bottom wall 93 of the water channel 90. The diffuser 60 is formed of a metal such as stainless steel, and is fixed to the bottom wall 93 of the water channel 90 in advance.

A driving section A for applying a driving force for sucking and stirring the mixed liquid is provided inside the apparatus casing B. The driving unit A includes a motor casing 1, a motor 2 housed in the motor casing 1, a shaft 1 of the motor 2,
3, the oil casing 3, the mechanical seal bracket 7, the impeller 8, and the like are assembled.

At the upper part of the motor casing 1, there is provided an adapter 75 for connecting the inner and outer conductors and keeping them watertight. The lower side of the motor casing 1 is closed in a watertight manner by an oil casing 3, and a motor chamber 40 is defined inside the motor casing 1. In addition, a suspension bracket 86 is provided on an upper portion of the motor casing 1.

The motor 2 includes a cylindrical stator 2a fixed to the inner peripheral wall of the motor casing 1, and a rotor 2b disposed concentrically with the stator 2a inside the stator 2a.
And A shaft 13 extending downward is fixed to the inner peripheral surface of the rotor 2b. Shaft 1
3 is rotatably supported by the upper bearing 39 and the lower bearing 4.

The oil casing 3 has an upper / lower two-layer structure, and a water reservoir 70 is formed between an upper portion 71 and a lower portion 72 of the oil casing 3, and is provided between the lower portion 72 and the mechanical seal bracket 7. An oil chamber 25 is formed. That is, at the bottom of the motor chamber 40, a flooded water chamber 70 partitioned from the motor chamber 40 is formed.

A liquid level sensor 80 is attached to the lower portion 72 of the oil casing 3 with screws or the like. The liquid level sensor 80 is an electrode type liquid level sensor, and its signal line (not shown) is connected to the adapter 75 through between the stator 2 a and the inner peripheral surface of the motor casing 1. A motor cable (not shown) for supplying electric power to the motor 2 is also connected to the adapter 75, and both the signal line and the motor cable are housed inside the cabtire cable 76 and led out. Have been.

Upper part 71 and lower part 7 of oil casing 3
The shaft 13 penetrates through the center of each of the two. The lower bearing 4 that supports the shaft 13 is housed in an upper portion 71 of the oil casing 3. The lower end of the outer peripheral part 21 of the oil casing 3 is connected to the inner peripheral part 24 of the mechanical seal bracket 7 via the mechanical seal 6. As a result, the oil casing 3 and the mechanical seal bracket 7 define an oil chamber 25 for supplying oil as a lubricant to the mechanical seal 6 which is a shaft sealing portion of the shaft 13.

Motor casing 1 and oil casing 3
Are fastened by bolts 63. Accordingly, the oil casing 3 fixedly supports the motor casing 1 and rotatably supports the shaft 13 via the lower bearing 4.

A part of the oil casing 3 is a mounting arm 5 extending radially outward from the center, and the drive unit A and the device casing B are fixedly mounted via the mounting arm 5. Specifically, the tip of the mounting arm 5 is fastened to the suction casing 9 by a bolt 64. As a result, the drive section A and the apparatus casing B are integrated, and constitute the main body section C.

An impeller 8 is fastened to the tip of the shaft 13. The impeller 8 includes a substantially cylindrical hub 36 extending parallel to the shaft 13, and a plurality of blades 37 protruding from the outer peripheral surface of the hub 36. Shaft 13
Are fastened by being inserted into mounting holes of an arm 36a extending to the center of the hub 36. Thereby, the shaft 13
The impeller 8 rotates according to the rotation of, and a suction force for guiding the mixed solution from above to below is generated. Impeller 8
At the lower end, a conical cone 38 projecting downward is attached so that the liquid mixture around the impeller 8 gradually merges downward.

As shown in FIGS. 3 and 4, on both sides of the diffuser 60, a pair of vertically extending guide rails 79 is provided. One of the guide rails 79 is formed by a hollow guide pipe 78 through which air flows, and the other is formed by a solid guide rod 77. The upstream end of the guide pipe 78 is connected to a blower (not shown) for supplying air. The downstream side of the guide pipe 78 is bent approximately 180 degrees from the downward direction to the upward direction, and a flange portion 81 having an upward opening is provided at the downstream end.
When the main body C is placed on the diffuser 60, the flange 82 of the air supply pipe 55 is mounted on the flange 81 of the guide pipe 78 in an unfixed state due to the weight of the main body C and the like. It is set so that the upward opening of the flange portion 81 is airtightly connected to the downward opening of the flange portion 82.

The main body C, which is constituted by integrating the drive section A and the apparatus casing B, is placed in an unfixed state on the diffuser 60 fixed to the bottom wall 93 of the water channel 90. I have. The lid 54 of the device casing B is in close contact with the flange 61 of the diffuser 60 due to the weight of the main body C, and the main body C is connected to the diffuser 60 in a watertight manner.

On both sides of the apparatus casing B, a guide member 84 engaging with the guide pipe 78 and a guide member 85 engaging with the guide rod 77 are provided. Thus, when the main body C is lifted or hung by a chain (see FIG. 5) or the like, the guide members 84 and 85 are guided by the guide pipe 78 and the guide rod 77, and the lateral displacement of the main body C is prevented. Disappears. Further, when the main body C is placed on the diffuser 60, the main body C is automatically guided to an appropriate mounting position.

As shown in FIG. 5, when the aerator 20 is installed, the guide members 84 and 85 of the main body C are engaged with the guide pipe 78 and the guide rod 77. And chain 87
And the main body C is placed on a diffuser 60 fixed to the water channel 90 in advance. On the other hand, when the main body C is taken out of the waterway 90 for maintenance or the like, the main body C is pulled by pulling the chain 87.
Hoist. Thus, according to the present aeration apparatus 20,
As for the attachment and detachment of the main body C which requires regular maintenance, fixing work such as bolt fixing becomes unnecessary. Therefore, maintenance can be performed quickly and easily.

When the aeration device 20 operates, the motor 2 is driven and the impeller 8 rotates according to the rotation of the shaft 13. By the rotation of the impeller 8, the mixed liquid is sucked obliquely downward into the stirring channel 41 through the suction port 14.

On the other hand, the air supplied from the blower (not shown) through the guide pipe 78 and the air supply pipe 55 is guided to the air chamber 52, and then, through the air diffuser 53, to the mixed liquid immediately after the impeller 8. It is discharged to. At this time, the diffuser 53
Is formed in an annular and slit shape, air is supplied to the mixed solution uniformly and in a film shape over the entire circumference. The flow rate of the mixed solution is faster on the outer peripheral side than on the center side of the impeller 8, and is the highest in the axial direction immediately after the impeller 8. Therefore, the air discharged from the air diffuser 53 is supplied to a region where the local flow velocity of the mixed liquid is highest. Accordingly, the discharged air violently collides with the mixed liquid, and is discharged into the discharge flow path 42 as fine bubbles. Therefore, the dissolution efficiency of oxygen increases. Also,
Even when the supply amount of the discharge air is large, there is no possibility that the air flows backward. Therefore, the amount of oxygen dissolved in the mixture can be increased.

The mixed liquid containing bubbles flowing out of the stirring channel 41 is rectified in the discharge channel 42 while changing the flow direction from the downward direction to the horizontal direction, and is discharged horizontally from the discharge port 62. Since the discharge port 62 is formed widely along the bottom wall 93 of the water channel 90, the discharge flow is blown out relatively uniformly over the entire flow channel of the water channel 90. In addition, since the flow velocity at the bottom of the waterway 90 increases, the waterway 90
The sedimentation of pollutants inside is effectively prevented.

As described above, according to the present embodiment, the main body C can be attached to the diffuser 60 simply by placing the main body C on the diffuser 60. Since the main body C can be removed from the diffuser 60 simply by lifting the part C, maintenance becomes easy.

The main body C is adapted to move the guide member 8 when moving up and down.
Since it is guided to a predetermined position by the guide rails 4, 85 and the guide rail 79, troublesome alignment is not required at the time of installation of the main body C, and the main body C can be easily attached.

Since the air supply pipe 55 of the main body C and the guide pipe 78 are connected in a watertight manner only by mounting the main body C on the diffuser 60, the troublesome operation between the main body C and the air supply source is troublesome. No connection work is required.

Since the diffuser 60 is constructed independently of the water channel 90, there are few restrictions on manufacturing and the water channel 90
Irrespective of the configuration of the above, the diffuser length can be sufficiently ensured. In addition, since there is no need to manufacture locally, manufacturing is easy. Therefore, the manufacturing period can be shortened and the manufacturing cost can be reduced. Moreover, even if it is damaged, it can be easily replaced.

The diffuser 60 is formed so as to gradually change the flow direction from the vertical downward direction to the horizontal direction, so that the mixed flow containing bubbles can be sufficiently rectified. If the length of the diffuser 60 is further increased, the mixed flow can be more reliably rectified.

Since the discharge port 62 of the diffuser 60 has a horizontally elongated flat shape, the mixed flow can be discharged uniformly over a wide range of the water channel 90.

Since the diffuser port 53 is provided in the apparatus casing B, the work of cleaning the diffuser port 53 outside the water channel 90 can be performed by pulling up the main body C. Therefore, maintenance becomes easy.

-Modifications- In the above embodiment, the impeller 8 is directly connected to the motor 2, but the application of the present invention is not limited to this, and the motor 2 and the impeller 8 Between them and a speed reducer.

The gas supplied to the mixture is not limited to air, but may be another gas, for example, another oxygen-containing gas.

[0057]

As described above, according to the present invention, since the main body is mounted on the diffuser in a non-fixed state, the main body can be easily attached and detached, and maintenance can be easily performed. be able to. Further, since the diffuser is provided independently of the water channel, the diffuser can be easily manufactured and the manufacturing cost can be reduced.

By providing a guide rail and a guide member for guiding the main body, attachment and detachment of the main body become easier.

By forming the discharge flow path so that the flow direction is curved from the vertical direction to the horizontal direction, the liquid to be treated containing a predetermined gas can be rectified and blown out in the flow direction of the water channel.

By forming the discharge flow path in a horizontally elongated flat shape toward the downstream side, the liquid to be treated containing a predetermined gas can be uniformly blown out along the bottom of the water channel.

By forming the air outlet in the apparatus casing, the air outlet can be easily cleaned as well as the maintenance work of the main body.

At least a part of the guide rail for guiding the main body is formed by a guide pipe, and an air supply pipe connecting the guide pipe and the air diffuser is provided in the apparatus casing.
In addition, since the main body is mounted on the diffuser to provide a flange that connects the air supply pipe to the guide pipe in a watertight manner, the air supply mechanism can be easily attached and detached, and maintenance can be facilitated.

By forming the diffuser with a metal, the degree of freedom in designing the diffuser can be increased, and the manufacturing period can be further shortened and the manufacturing cost can be further reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a water channel.

FIG. 2 is a sectional view of an aeration apparatus.

FIG. 3 is a sectional view of an aeration apparatus.

FIG. 4 is a plan view of the aeration apparatus.

FIG. 5 is a diagram corresponding to FIG. 3 with a main body removed.

[Explanation of symbols]

 Reference Signs List 2 motor 8 impeller 20 aerator 41 stirring channel 42 discharge channel 52 air chamber 53 diffuser port 54 lid 55 air supply tube 60 diffuser 62 discharge port 78 guide pipe 79 guide rail 81 first flange 82 second flange 84, 85 Guide member 90 Water channel A Drive unit B Device casing C Main unit

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Tsuyoshi Morita 14 Takudai, Ono-shi, Hyogo Prefecture New Meiwa Industry Co., Ltd. Company Industrial Machinery System Division (72) Inventor Satoshi Mashimo 14 Takumidai, Ono City, Hyogo Prefecture Shinmeiwa Industry Co., Ltd. Industrial Machinery System Division F term (reference) 4D029 AA09 AB03 BB01 CC07

Claims (7)

[Claims] A drive unit having a rotating impeller; an apparatus casing defining a stirring channel for stirring and mixing a liquid to be treated sucked by rotation of the impeller with a predetermined gas; A diffuser for forming a discharge flow path for discharging a gas and the liquid to be treated, wherein the drive unit and the device casing are fixed to each other to form a main body; An aerating device mounted on the diffuser in a non-fixed state so that the discharge channel and the discharge channel are continuous. 2. The aeration apparatus according to claim 1, wherein a guide rail extending in a vertical direction is provided on the main body, and the guide is engaged with the guide rail so as to guide the vertical movement of the main body. Aeration device comprising: 3. The aeration apparatus according to claim 1, wherein a flow direction of the stirring-mixed predetermined gas and the liquid to be treated is curved from a vertical direction to a horizontal direction. Aeration device that is configured to do so. 4. The aeration apparatus according to claim 1, wherein the discharge channel has a flattened shape that is horizontally long toward the downstream side. 5. The aeration apparatus according to claim 1, wherein an aeration port for supplying a predetermined gas to the liquid to be processed is formed in the apparatus casing. . 6. The aeration apparatus according to claim 2, wherein at least a part of the guide rail is formed by a guide pipe through which a predetermined gas flows, and the tip of the guide pipe opens upward. A first flange portion provided with a first air supply port is provided; and a second air supply port that opens downward to correspond to the first air supply port is formed at an end of the device casing, and An air supply pipe having a second flange portion mounted on the one flange portion is connected, and a diffuser port for supplying a predetermined gas introduced from the air supply pipe to the liquid to be processed is formed. Aeration device. 7. The aeration apparatus according to claim 1, wherein the diffuser is formed of a metal.