JP2004188260A - Underwater aeration apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an underwater aeration apparatus for performing an effective aerating action by its own sucking capacity while dispensing with an air replenishing unit and its incidental facilities without losing its own sucking function even when installed at a deep place. <P>SOLUTION: In this underwater aeration apparatus, a guide casing 1 having a liquid sucking port 2 in the central part of the undersurface, an air sucking port 3 in the central part of the upper surface, and a gas and liquid discharging port 4 on the outer peripheral surface is immersed in a liquid. An air chamber 5 is arranged on the casing 1 and communicated with the atmosphere above the liquid level. On the main plate of an agitating impeller 7 which is housed in the casing 1 and rotated by a motor 12, a vent hole 9 for communicating the chamber 5 with a liquid flow passage 8 is bored between the adjacent blades. The boss part of the impeller is fit to the tip of a shaft 11 of the motor 12 that is made to penetrate the chamber 5 and lowered. An air compressing impeller 13 is arranged just above the impeller 7 and rotated together with the impeller 7. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to an underwater aeration apparatus installed and used in an aeration tank in the treatment of industrial wastewater and wastewater of city sewage.
[0002]
[Prior art]
2. Description of the Related Art An underwater aeration device that introduces air in the atmosphere into a negative pressure portion of an impeller rotating in a liquid tank to generate an aeration effect is known. A conventional underwater aeration apparatus is usually provided with an axial flow blade that is advantageous for circulating a large amount of wastewater within a certain period of time (for example, see Patent Document 1). Further, there is an apparatus equipped with an impeller having both functions of stirring and air suction in order to effectively perform self-priming of air (for example, see Patent Document 2).
[0003]
[Patent Document 1]
JP 2001-276876 A (FIG. 1-5)
[Patent Document 2]
JP-A-54-63542 (FIG. 1)
[0004]
[Problems to be solved by the invention]
The device of Patent Document 1 is not suitable for high-speed rotation due to the characteristics of the axial impeller, and cannot increase the air supply pressure. Therefore, an air supply device is separately installed outside the tank and forced air is supplied from the air supply device. Must be dealt with. Further, in the device of Patent Document 2, the impeller has both functions of self-priming suction and gas-liquid mixing. When the installation water depth is shallow, an aeration effect can be obtained by high-speed rotation. Since the air pressure is lower than the outside water pressure and the self-priming suction function is lost, forced air supply by an air supply device is required separately. Therefore, it is necessary to secure a space for the intake air supply device, power supply equipment, piping equipment, building equipment, and the like, thereby increasing costs.
[0005]
The present invention solves the above-mentioned problems, and enables a high-speed rotation drive without requiring an air replenishing device and various facilities attached thereto, and allows a large amount of air to be removed from the atmosphere by the suction capability of the aeration device itself. It is an object of the present invention to provide an underwater aeration apparatus capable of performing effective aeration without losing the self-priming and suction function even when the installation water depth is deep by sucking and reducing manufacturing costs and running costs.
[0006]
Configuration of the Invention
In the underwater aeration apparatus according to the present invention, a liquid suction port is opened in the center of the lower wall, an air inlet is opened in the center of the upper wall, and a guide casing provided with a gas-liquid discharge port on the outer peripheral surface is immersed in the liquid. An air chamber is provided on the guide casing and communicates with a ventilation conduit led from the atmosphere above the liquid level. The main plate of the stirring impeller housed in the guide casing and rotated by a motor includes an air chamber. There is a vent hole that leads to the liquid passage between the blades, and the boss of the agitating impeller is fitted to the leading end of the motor shaft guided down through the air chamber, An air pressurizing impeller, which rotates together with the stirring impeller, was provided directly above the impeller.
[0007]
[Action]
When the stirring impeller rotates, the air pressurizing impeller also rotates, and the air sucked into the air chamber from the air above the liquid level through the ventilation pipe is sent to the liquid passage between the blades through the ventilation hole. Then, the water merges with the water sucked from the liquid suction port and sent in the circumferential direction through the liquid passage, and forms a gas-liquid mixture, which is ejected from the gas-liquid discharge port on the outer peripheral surface of the guide casing.
[0008]
【Example】
This will be described below with reference to the embodiment shown in FIGS.
[0009]
Reference numeral 1 denotes a guide casing which is immersed in a liquid such as an aeration tank or the like. The guide casing 1 has a liquid suction port 2 at the center of the lower wall, an air inlet 3 at the center of the upper wall, and a gas-liquid discharge port 4 on the outer peripheral surface.・ 4 are installed. Reference numeral 5 denotes an air chamber provided in the guide casing 1 and communicates with a ventilation conduit 6 led from the atmosphere above the liquid level. Reference numeral 7 denotes a stirring impeller housed in the guide casing 1, and the main plate thereof is provided with ventilation holes 9 ... 9 from the air chamber 5 to the liquid passages 8 ... 8 between the blades 10 ... 10. Is established. The leading end of the motor shaft 11 guided through the air chamber 5 is fitted to the boss of the stirring impeller 7 and rotated by the drive of the motor 12. Reference numeral 13 denotes an air pressurizing impeller provided directly above the stirring impeller 7. The shape of the impeller does not need to be specified. For example, if it is of an axial flow shape, it can be structurally simplified. It is desirable that the outer periphery of the air pressurizing impeller 13 is surrounded by the air supply guide cylinder 14 in the air chamber 5, and it can be formed integrally with the outer periphery of the boss portion of the stirring impeller 7. A structure manufactured as described above may be fitted to the boss of the stirring impeller 7. In addition, 15... 15 are guide vanes vertically provided between the gas-liquid discharge ports 4.
[0010]
When the underwater aeration apparatus of the present invention is started, a regular rotation operation is performed after the liquid in the air chamber 5 is discharged at a slow start by an inverter or the like, or air is supplied to the ventilation conduit 6 only at the time of startup, and Check the liquid discharge and start directly. When the stirring impeller 7 rotates, the air pressurizing impeller 13 also rotates, and the air sucked into the air chamber 5 from the air above the liquid level through the ventilation pipe 6 passes through the ventilation holes 9. 8 is fed into the liquid passage 8 between the blades 10 and 10 and merged with the water sucked in from the liquid suction port 2 and sent in the circumferential direction through the liquid passage 8. As a result, gas is ejected from the gas-liquid discharge ports 4 on the outer peripheral surface of the guide casing.
[0011]
【The invention's effect】
According to the underwater aeration apparatus of the present invention, unlike the conventional apparatus using an axial impeller or the like, a high-speed rotation drive is possible, and an air supply apparatus and various facilities attached thereto are not required. A large amount of air is suctioned from the atmosphere with the suction capacity of the device, and even if the installation water depth is deep, an effective aeration operation is performed without losing the self-priming suction function, and the manufacturing cost and the running cost can be reduced. There is.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional side view of a main part of an underwater aeration apparatus of the present invention.
FIG. 2 is a bottom view of a stirring impeller in the underwater aeration apparatus of the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 guide casing 2 liquid suction port 3 suction port 4 gas-liquid discharge port 5 air chamber 6 ventilation conduit 7 stirring impeller 8 liquid passage 9 ventilation hole 10 blade 11 motor shaft 12 motor 13 air pressurization impeller

Claims (1)

A liquid suction port is opened in the center of the lower wall, an air inlet is opened in the center of the upper wall, and a guide casing provided with a gas-liquid discharge port on the outer peripheral surface is immersed in the liquid. An air chamber, which communicates with the guided ventilation conduit, is provided on the guide casing. The main plate of the stirring impeller housed in the guide casing and rotated by the motor communicates with the liquid passage between the blades from the air chamber. A ventilation hole is formed, and a boss portion of a stirring impeller is fitted to a leading end portion of a motor shaft guided down through the air chamber, and the stirring blade is located immediately above the stirring impeller. An underwater aeration device, further comprising an air pressurizing impeller that rotates with a car.

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