JP2000024683A - Underwater agitating aerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an agitating aerator capable of supplying the large amt. of air with small power and capable of supplying oxygen to a treated liq. in an aeration tank at a high supply rate. SOLUTION: This device is provided with an impeller 13 for delivering a treated liq. and a casing 40 in which a discharge port 46 for discharging a treated liq. delivered from the impeller 13 is provided vertically above the impeller 13. The casing 40 is provided with a treated liq. passage 44 for conducting the treated liq. delivered from the impeller 13 to the discharge port 46 and provided on the downstream side of the impeller 13, the extension of the discharge port 46 has the height of V in the vertical direction, an air discharge port 52 for discharging pressurized air in the treated liq. is provided to the passage 44 and the vertical installation position of the air discharge port 52 is within or above the vertical height of V of the discharge port 46. Consequently, since the vertical installation position of the air discharged port is at a position more than within the vertical height of the discharged port, the installation position is positioned at the shallow position of the water depth and the necessary pressure of the pressurized air is lowered as much as the position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underwater stirring aeration apparatus, and more particularly to an underwater stirring aeration apparatus provided with an air discharge port on the downstream side of an impeller.

[0002]

2. Description of the Related Art When treating a treatment liquid such as sewage with an aerobic microorganism in an aeration tank, a large amount of fine air is mixed into the aeration tank. As one method for this, conventionally, the processing liquid in the detonation tank is stirred by a mechanical underwater stirring and aerator 100 equipped with an axial impeller 113 as shown in FIG. There is a method in which air is guided to a submerged stirring aeration apparatus 100, mixed into a processing liquid inside the apparatus, and discharged into an aeration tank.

In such a mechanical underwater stirring and aeration apparatus, it is required that a large amount of air be fined and mixed into the processing liquid. For this reason, in the conventional underwater stirring aeration apparatus 100 shown in FIG. 3, a blower or a blower (not shown) is installed outside the aeration tank, and pressurized air A is introduced into the inside of the underwater stirring aeration apparatus 100 by piping. This air A
1 into the processing liquid to form a mixed fluid W1 of the processing liquid and air.
Is discharged from the discharge port 146 to the aeration tank.

A conventional underwater stirring and aeration apparatus 100 shown in FIG.
Includes an underwater motor 111 and an axial-flow impeller 113 driven by the underwater motor 111 via a speed reducer 112. The impeller 113 is housed in a suction casing 141 for lower suction, and a position immediately after the downstream side of the impeller 113, between the suction casing 141 and the discharge casing 142 disposed above the suction casing 141.
An air outlet 152 is provided.

[0005] Pressurized air A from the outside of the aeration tank is supplied to an air supply pipe 15.
4 and the discharge port 1 around the discharge casing 142.
The air A <b> 1 is introduced into the air chamber casing 154 a formed below the air chamber 46, and discharges the air A <b> 1 from an air discharge port 152 formed at a lower portion of the air chamber casing 154 a. The air chamber casing 154a and the air supply pipe 154 are integrally formed, and the air supply pipe 154 falls from the upper side in the vertical direction to reach the air chamber casing 154a.

[0006]

According to the above-described conventional underwater stirring and aeration apparatus, pressurized air is supplied immediately after the impeller.
Since the processing liquid is discharged to the vicinity of the lowermost part of the processing liquid passage formed upward from the impeller, high pressure pressurized air is required, and there is a problem that the power of the blower or the like increases.

In general, the optimum location where air is mixed into the processing liquid varies depending on the flow velocity and pressure distribution of the processing liquid passing through the impeller. However, the position of the air discharge port of the conventional underwater stirring and aeration apparatus is not always the same. It was not the optimal position of the air supply port that could supply a large amount of air with small power without dismantling the floc, which is the activated sludge microorganisms in the tank.

Accordingly, an object of the present invention is to provide a stirring aeration apparatus which supplies a large amount of air with a small power and has a high oxygen supply rate to a processing solution in an aeration tank.

[0009]

In order to achieve the above object, an agitating and aerating apparatus according to the first aspect of the present invention comprises, as shown in FIG. 1, an impeller 13 for sending out a processing liquid;
And a discharge port 46 for discharging the processing liquid sent from the impeller 13 to the impeller 1.
A casing 40 having a processing liquid passage 44 provided on the downstream side of the impeller 13 for guiding the processing liquid sent from the impeller 13 to a discharge port 46. The discharge port 46 has a vertical height V; and the processing liquid passage 44 is provided with an air discharge port 52 for discharging pressurized air A into the processing liquid. Is vertically located within or above the range of the vertical height V of the discharge port 46.

With such a configuration, the vertical installation position of the air discharge port 52 for discharging the pressurized air A into the processing liquid is within the range of the vertical height V of the discharge port 46 or above the range. Therefore, it is located at a place where the water depth is shallow, and the pressure of the pressurized air can be lower by that amount.

Further, in the stirring and aeration apparatus, the casing 40 has an air inlet 51 for receiving pressurized air A supplied from the outside and an air inlet 51 for receiving the pressurized air A. It has an air passage 53 leading from the port 51 to the air discharge port 52; the air path 53 has a discharge port 46 at the top T (FIG. 2) of a vertical section at any point along the flow. May be configured so as to be within the range of the vertical height V or higher.

[0012] With this configuration, the air passage is arranged such that, at any point along the flow, the uppermost portion of the cross section taken in the vertical direction is within the range of the vertical height of the discharge port or higher. Therefore, for example, at the time of activation of the stirring and aerator of the present invention, the pushing water column for pushing the pressurized air into the air discharge port is the minimum pressure required to operate this stirring and aerator, that is, the pressure to the discharge port. Just a water column.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The inventor has changed the position of an air supply port of a mechanical underwater stirring and aeration apparatus, that is, an air discharge port for releasing pressurized air to water as a treatment liquid, by changing the position in the aeration tank. After operation, the amount of oxygen dissolved in the aeration tank was experimentally determined. As a result, the oxygen supply rate to the processing liquid in the aeration tank is the highest when the position of the air supply port is provided in a part of the upper cover in the middle of the discharge flow path which is the processing liquid passage of the underwater stirring aeration apparatus. I discovered that.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding members are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 1 shows an underwater stirring aeration apparatus 1 according to the present invention.
0 is a side sectional view. In the drawing, a submersible motor 11 is provided with a drive shaft end (not shown) directed downward in the vertical direction, and a reduction gear 12 having a planetary gear mechanism is connected directly below the submersible motor 11 with an input shaft connected to the shaft of the motor 11 of the submersible aeration and aeration device. Provided and
An axial flow type impeller 13 is mounted on the output shaft facing downward of the speed reducer 12 so as to perform lower suction and upper discharge.

Underwater motor 11, speed reducer 12, impeller 13
Is mounted or housed in the casing 40. The casing 40 includes a suction casing 41 and a discharge casing 42. The impeller 13 is housed in a suction casing 41, and the tip of the impeller 13 is
The suction casing 41 is assembled with a small gap with respect to the inner surface thereof. The suction casing 41 and the discharge casing 42 are connected to each other by a horizontal flange provided slightly above the downstream side of the impeller 13.

The suction casing 41 is of a lower suction type, and the sucked water is flown by the impeller 13 to an upper discharge casing 42. The discharge casing 42 has a processing liquid passage 44 formed therein for changing the axial flow, that is, the vertical flow from the impeller 13 into a horizontal flow with a smooth curve. The processing liquid passage 44 is formed by an outer wall of the discharge casing 42 and an air chamber casing 45 provided inside. In the embodiment of FIG. 1, the air chamber casing 45 is shown as being made of a steel plate structure separate from the discharge casing 42.
It may be formed integrally, for example, by casting.

The air chamber casing 45 has a funnel shape. The lower part of the air chamber casing 45 surrounds the casing of the speed reducer 12, and the upper part of the air chamber casing 45 extends substantially horizontally in the vertical upper part of the discharge casing 42. It is continuous with the discharge casing upper cover 42a formed as a flat plate shape. With such a configuration, the processing chamber passage 44 is formed between the air chamber casing 45 and the discharge casing upper cover 42a and the outer wall of the discharge casing. At the end of the processing liquid passage 44, a discharge port 46 is formed so that the discharge direction is substantially horizontal.

An air discharge port 52 is formed between the air chamber casing 45 and the discharge casing upper cover 42a in an annular shape with the discharge direction oriented substantially horizontally. The discharge port 46 is formed with the vertical height V of the present invention (the height here is not a height position but a height width, that is, a range between the upper end and the lower end of the discharge port) V,
The position of the air outlet 52 in the vertical direction is within the range where the vertical height V exists. In this case, the discharge port 46
Are oriented in the horizontal direction, and therefore have a vertical height V but a horizontal width H of zero. The height V in the vertical direction and the width H in the horizontal direction will be described later in detail with reference to FIG.

The underwater stirring / aeration device 10 is installed on a pedestal 61 having a plurality of legs provided vertically below the suction casing 41, and the processing liquid passes through the plurality of legs to allow the processing liquid of the suction casing 41 to pass therethrough. It is sucked into the suction port. In addition, the underwater stirring aeration device 10 includes a suspending device 6 attached to the electric motor support 43 above the discharge casing 42.
2, it is configured to be installed in the aeration tank or lifted from the aeration tank.

The vertical height will be further described with reference to FIG. In FIG. 2A, the processing liquid passage 44a curves upward and downward from the vertical direction in the side cross-sectional view, and deflects slightly downward again.
Is shown obliquely downward. In this case, since the discharge port 46a faces obliquely downward, the discharge port 46a has a vertical height V1 and a horizontal width (width in the horizontal and radial directions) H1. . In the embodiment of the present invention, the vertical position of the air discharge port 52a is within the range of the vertical height V1.

In FIG. 2B, in the side sectional view, the processing liquid passage 44b is formed obliquely while curving vertically downward from the position of the air discharge port 52b.
The figure shows a case where b is directed obliquely downward. In this case, since the discharge port 46b faces obliquely downward,
The discharge port 46b has a vertical height V2 and a horizontal width H.
2 will be obtained. In this embodiment, the vertical position of the air discharge port 52b is higher than the range of the vertical height V2.

FIG. 2 (c) shows a case where the processing liquid passage 44c is formed vertically downward from above in a side sectional view, and the discharge port 46c is directed obliquely upward. In this case, since the discharge port 46c faces obliquely upward, the discharge port 46c has a vertical height V3 and a horizontal width H3. In the embodiment of the present invention, the height position of the air discharge port 52c in the vertical direction is within the range of the vertical height V3.

Returning to FIG. 1, the attachment of the air supply pipe for supplying pressurized air from the outside will be described. In the drawing, an annular electric motor support 43 is attached to the inside of the annular shape of the discharge casing upper cover 42a formed in an annular flat plate shape. The speed reducer 12 is fitted and supported inside the annular motor support 43. After all, the underwater motor 11 mounted on the upper part of the speed reducer 12 is supported by the support 43.

The motor support 43 has an air inlet 51.
, And an air supply pipe 54 is connected thereto from above in the vertical direction. An air passage 53 is formed by the outer wall of the speed reducer 12, the electric motor support 43, and the air chamber casing 45 from the air introduction port 51 to the air discharge port 52.

As described above with reference to FIGS. 2 (a), 2 (b) and 2 (c), the air outlet is provided in a part of the upper cover, that is, the installation position of the air outlet in the vertical direction is as follows. If the discharge port is configured to be within the range of the vertical height or above the range, the oxygen supply rate to the processing liquid in the aeration tank is increased.

The form of the air passage 53 will be described with reference to FIG. FIG. 2D is a schematic diagram of a cross section of the processing liquid passage of the underwater stirring / aeration apparatus according to the embodiment of the present invention. In the figure, the air passage from the air inlet 51 to the air outlet 52 is schematically shown with the vertical passage height developed along the air flow direction. This passage 53
The uppermost portion T of the cross section taken in the vertical direction is within the range of the vertical height V of the discharge port 46 or higher at any point along the flow.

Since the underwater stirring and aerator is used submerged, the air passage 53 is generally filled with water before starting. When activated, the water is pushed out by the pressurized air supplied from the air supply pipe 54. In the embodiment of the present invention shown in FIG. 1, the discharge port 152 or the air supply pipe 154 as shown in FIG. 3 is different from the conventional underwater stirring and aeration apparatus below the discharge port 146 in the vertical direction. The pressure of the pressurized air required at the time of startup is also reduced by the water column difference between the falling portion of the air passage and the discharge port, and the power for equipment such as a blower can be reduced.

As described above, according to the embodiment of the present invention, there is provided a mechanical underwater stirring / aeration apparatus having a lower suction / upper discharge type structure which is operated by being immersed in a processing liquid in an aeration tank. The air is guided from a blower or a blower installed outside the aeration tank, released into the processing liquid downstream of the impeller of the underwater stirring and aerator, mixed with the processing liquid and air, and discharged into the aeration tank together with the processing liquid. At the same time, the processing liquid in the aeration tank is stirred and, at the same time, fine air is mixed into the processing liquid. In such a mechanical underwater stirring and aeration device, the air discharge port is provided at a part of the upper cover forming the discharge channel of the aerator. With such a configuration, it was possible to reduce the power required to supply a large amount of air and increase the rate of air entrapment in the processing liquid in the aeration tank.

[0030]

As described above, according to the present invention, the vertical installation position of the air discharge port for discharging pressurized air into the processing liquid is within the range of the vertical height of the discharge port or within the range. Since the air passage is also above, the oxygen supply rate to the processing liquid in the aeration tank is increased, and the uppermost part of the vertical cross section of the air passage at any point along the flow is When the outlet is configured so as to be within the range of the vertical height or higher than the outlet, the pressure for extruding the air is reduced, and it is possible to reduce the facility power for generating the pressurized air.

[Brief description of the drawings]

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

FIG. 2 is a schematic diagram of a cross section of a processing liquid passage of a submerged stirring aeration apparatus according to an 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 11 Underwater motor 12 Reduction gear 13 Impeller 40 Casing 41 Suction casing 42 Discharge casing 42a Discharge casing upper cover 43 Electric motor support 44 Processing liquid passage 45 Air chamber casing 46 Discharge port 51 Air introduction port 52 Air discharge port 53 Air path 54 Air supply pipe 61 gantry 62 hanging tool

 ──────────────────────────────────────────────────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 AA01 AA09 AB06 BB10 BB11 CC06 4G035 AB10 AB14 AB16 AB21 AE13

Claims (2)

[Claims] An impeller for sending out a processing liquid; and a casing for housing the impeller, the discharge port for discharging the processing liquid sent from the impeller being vertically above the impeller. And a casing; the casing has a processing liquid passage provided on the downstream side of the impeller for guiding the processing liquid sent from the impeller to the discharge port; An air discharge port for discharging pressurized air into the processing liquid is provided in the processing liquid passage, and a vertical installation position of the air discharge port is set in a vertical direction of the discharge port. Characterized in that it is within or above the range of the directional height; a stirring aeration device. 2. The casing has an air inlet for receiving pressurized air supplied from the outside, and an air passage for guiding the received pressurized air from the air inlet to the air outlet. Is characterized in that, at any point along the flow, the uppermost part of the section taken in the vertical direction is within or above the range of the height of the discharge port in the vertical direction; 2. The stirring aeration apparatus according to 1.