JPS60222194A - Aerating device - Google Patents

Abstract

PURPOSE:To increase the blowing rate of air and the swirling flow rate over the entire part of an aerating chamber and to increase considerably an aerating effect by providing a cylindrical guide pipe which conducts further downward the descending flow generated by an impeller and expanding the top end of the cylindrical guide pipe to a funnel-shape. CONSTITUTION:The impeller 33 which generates downward flow by swirling is disposed in the liquid in the aerating chamber 1 and a gas diffusion port for diffusing the gas into the descending flow generated by the impeller 33 is opened into a driving shaft for driving the imepller; further the cylindrical guide pipe 4 for conducting further downward said descending flow is disposed below the impeller 33. The top end of the pipe 4 of such aerating device is expanded to the funnel-shape. As a result the air blowing rate is increased and the swirling flow rate over the entire part of the chamber is increased and therefore the aerating effect is considerably increased.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an aeration device which supplies air or other gas into various liquids such as sewage while stirring the liquid and dissolves the liquid. It is something.

[Conventional technology]

With conventional equipment that stirs liquid and aerates by blowing air, when the water is deep, it is difficult for the stirring water flow and air bubbles to reach the bottom of the tank, making it difficult to uniformly aerate the entire tank. There were drawbacks such as solid matter settling at the bottom and rotting.

[Problem that the invention seeks to solve]

The present invention allows this stirring water flow to reach the bottom of the aeration tank, and at the same time allows the air bubbles flowing into the liquid to reach the bottom of the tank, thereby agitating the entire tank, preventing sedimentation of solids, and efficiently performing X-aeration. That is.

[Means for solving problems]

The present invention was made for the purpose of increasing the flow rate of the liquid generated by the agitating blade and causing the stirring flow and suction bubbles to reach the bottom of the tank, thereby providing a uniform aeration effect throughout the tank. an agitating blade which is arranged in the agitating blade and which generates a downward flow by its rotation; an aeration opening which is opened in a drive shaft that drives the agitating blade and which diffuses gas in the downward flow created by the agitating blade; In an aeration device comprising a guide tube disposed below the stirring blade and guiding the downward flow further downward, the upper end of the first rising guide sieve tube is expanded into a morning glory shape. Example] The present invention will be described below based on illustrated embodiments.

In the figure, reference numeral 1 denotes an aeration tank having the required shape and internal volume, and a pedestal 2 is provided approximately in the center of the nuclide, and the pedestal 2 allows an aerator 3 to be vertically installed in the tank. This aerator 3 has a hollow stirring shaft 32 connected directly or indirectly to a driving motor 31, and a stirring blade 33 is fixed to the lower end of this shaft 32, and the outside of this motor and shaft is covered with a The stirring blade is driven by a motor to rotate the stirring blade through the stirring shaft, thereby stirring the liquid, generating negative pressure in the liquid, and sucking air or gas into the liquid along with the vortex of the liquid. , the air or gas bubbles are agitated and mixed together with the vortex, and the stirring blades are used to agitate and dissolve air or gas bubbles. Each opening 36 is perforated. Further, a cylindrical guide tube 4 is vertically installed on the mount 2 via a bracket 5, and this guide tube is positioned below the stirring blade, and its upper and lower ends are connected to the inflow and outflow of the liquid. In order to do this efficiently, the ends are widened in the shape of a morning glory. In the illustrated embodiment, the stirring blades are provided so as to be slightly inserted into the upper end of the guide tube. And this guide tube 4
The diameter of the guide cylinder and its length are determined appropriately depending on the shape of the seed, especially the depth of the water, but it is desirable that the diameter of the guide tube is set within a range of L5 to 3 times the diameter of the stirring blade. In addition, the ones shown in Figs. 3 to 5 have an intake air amount adjustment valve 7 on the cover near the intake port of the motor and the empty drive shaft. 1 By adjusting the opening and closing of the valve, the amount of gas sucked into the liquid can be adjusted. All other parts of this embodiment are the same as the embodiment shown in FIGS. 1 and 2.

In the embodiment in which this intake air amount control valve 7 is provided, there is no DO in the tank.
A sensor (not shown) is provided, and the sensor detects D in the tank.
The intake air amount is controlled by detecting the O value.

Therefore, in the aeration device configured as described above, the motor 3
When driven 1t, the stirring blade rotates via the drive shaft connected thereto, generating a swirling flow in the liquid within the first guide tube. In addition, this swirling flow or vortex flow of the liquid generates negative pressure in the liquid, and gas is sucked in through the intake port 35 of the hollow drive shaft, flows down inside the shaft, and enters the liquid through the air diffuser port 36' at the lower end. released. At this time, the bubbles become fine bubbles due to the stirring blade or the vortex. This swirling flow of liquid flows down inside the guide tube 4 at a high flow rate, reaches the bottom of the aeration tank, passes through the lower end of the guide tube, floats to the upper surface, and further flows into the upper end of the guide tube. In this way, inside the tank like an arrow,
This creates a swirling flow, and the liquid in the tank begins to swirl inside and outside the guide tube. Examples will be shown below, in which the upper end of the guide tube is expanded into a morning glory shape as in the present invention, and in which it is not. Assuming that the amount of air blown in the latter case is 100, the ratio of the air subsystem in the former case is shown in the table below.

This is because by widening the upper end of the guide tube into a morning glory shape, more liquid can be taken into the guide tube from the upper part of the guide tube, and the swirling flow rate also increases, resulting in an air diffuser opening of the blower. It is estimated that this is the result of an increase in the negative pressure in the vicinity, and as a result, the amount of gas injected into the aerator has increased significantly. At this time, the gas sucked in by the aerator becomes bubbles and the water flow inside the guide tube. As a result, refinement progresses and 1 oxygen dissolution efficiency improves, DO
By providing a sensor, the amount of gas sucked can be easily adjusted.

〔Effect of the invention〕

According to the present invention, since the liquid intake port at the upper end of the first guide tube is opened, the amount of air blown increases and the swirling flow rate of the entire tank also increases, which has the advantage of greatly increasing the overall aeration effect.

[Brief explanation of drawings]

Figure 1 is a front view, Figure 2 is a side view, Figure 3 is a front view of a different embodiment, Figure 4 is a plan view of Figure 1llIa, Figure 5 is the aQ11 diagram and #I6 diagram of the aerator. is the number 7. 1... Aeration tank 2... Frame 3... Aerator 4... Guide cylinder pipe 6... Sealing cover 7... Intake amount control valve v, 1 Figure 3 Figure 2 Figure 4 jl ) Figure 6 L”y7/-t (starvation)

Claims (1)

[Claims] A stirring blade which is placed in the liquid in the aeration tank and generates a downward flow by its rotation; and 1) an opening which is opened at the drive shaft that drives the stirring blade and diffuses gas into the downward flow created by the stirring blade. The aeration device comprises an air port and a guide tube disposed below the stirring blade to guide the downward flow further downward, characterized in that the upper end of the guide tube is expanded into a morning glory shape. Aeration equipment.