JPS63294998A - Aeration stirrer - Google Patents

Abstract

PURPOSE:To improve the balances above and below the vanes of a water flow generator and to lower the flow rate of water flow so that the oscillation of the vanes is obviated by providing a draft ring enclosing the vanes and providing a partition wall ring to be introduced with the air to the intermediate part of the vanes concentrically with the revolving shaft of the vanes. CONSTITUTION:While the water around a stand 6 is sucked into the draft ring 15 and is stirred by the rotation of the vanes 2, the water flow is generated. The water flow is generated also in the partition wall ring 14 in the intermediate part of the vanes existing in the draft ring 15. As a result, a negative pressure is generated in front of the air outlet 10a and the air is sucked out of the outdoor air through an air chamber 11 and an air supply pipe 12 and is introduced into the ring 14 so as to be passed therethrough, by which the air is incorporated in the form of fine bubbles into a wide range of the water and to aerate the sewage. As a result, the densities of the water in the tip parts of the vanes 2 are equalized above and below and the balance of the vanes 2 is improved, by which the flow rate of the water is lowered and the generation of the oscillation in the vanes 2 is obviated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an aeration agitation device for use in sewage treatment tanks, fish ponds, etc.

(Prior art) Conventionally, in treatment tanks of sewage treatment equipment using microorganisms, fish ponds, etc., in order to diffuse bubbles that dissolve oxygen in the water, a water wheel was rotated at the water surface or pressurized air was pumped into the water. Aeration was performed by blowing air into the air.

(Problems to be solved by the invention) A water wheel that rotates at the surface of the water cannot aerate the deep part of the water, and a system that performs diffused aeration by blowing pressurized air causes large bubbles that cause gas-liquid contact. was not done enough.

(Means for solving the problem) A draft ring is provided to surround the blades of a water flow generator that generates water flow by rotating the blades, and a partition ring is provided in the middle of the blade concentrically with the rotation axis. It was as if air was introduced into the partition wall ring.

(Function) As described above, as the blades rotate, the water around the mount is sucked into the draft ring by the blades, and is stirred to generate a water flow. At this time, water flow is also generated inside the partition ring inside the draft ring, so the front surface of the air outlet becomes negative pressure, and air is sucked out from the atmosphere through the air chamber and air supply pipe and introduced into the partition ring. It passes through and forms an air current in the water stream, and the waves of the water stream cut out the air and turn it into fine particles that mix with the water as it moves forward, and the air mixes into the water over a wide area as fine particles. Since the air sucked out from the outlet is introduced into the partition wall ring and passes through, the density of water at the tip of the blade is the same both above and below, resulting in a good balance of the blades, which reduces the water flow velocity and causes vibrations in the blades. There's nothing to do.

(Example) A brief explanation of the drawings is given above. For convenience of explanation, the left and right in FIG. 1 are referred to as "front" and "rear".

Reference numeral 1 denotes a water flow generator that generates water flow by rotating blades 2, and the rotating shaft 3 of the blade 2 is fixed to the mold shaft IC in the tip recess 1b of the water flow generator main body 1a by means of a friction ring 4 and a bolt 5. be.

The water flow generator 1 is fixed to a pedestal 6, and the lifting members 6a and 6b of the pedestal 6 are vertically slidably fitted into a guide bar 7 installed upright in a treatment tank of a sewage treatment plant. A ceno 8 attached to the upper part is raised and lowered by a ceno hoist (not shown).

9 is a mechanical seal of the mold shaft IC, 10 is a sliding ring, and the space between the peripheral wall of the tip recess 1b of the water flow generator 1a and the rotating shaft 3 of the blade 2 is an air chamber 11. The sliding ring 10 has an appropriate number of notches on its outer periphery.
It serves as an air outlet 10a and introduces air into a partition ring 14, which will be described later.

12 is an air supply pipe that communicates with the air chamber 11.

The rotating shaft 3 is hollow, and a blind lid 13 is screwed onto the tip.

Reference numeral 14 denotes a partition ring in the shape of a short cylinder with a slightly larger rear diameter, which is located at a position farther from the center of the rotating shaft 3 than the air outlet 10a (fixed concentrically with the rotating shaft in the middle of the blade 2). .

A draft ring 15 is fixed to the frame 6 so as to surround the blade 2, and serves as a guide to increase efficiency and generate a strong swirling water flow WF at the tip of the blade 2.

Reference numeral 16 denotes a power supply cable for the water flow generator 1, which is connected to a ground power source (not shown). P is a treatment tank such as a sewage treatment plant, AJ
is the air flow, and WFW is the wave of the water flow WF.

When the blades 2 are rotated by supplying power to the water flow generator 1, the water around the pedestal 6 is sucked into the draft ring by the blades 2 and discharged while being stirred, thereby generating a water flow WF. At this time, even on the inside of the partition ring in the draft ring, the water around the pedestal is sucked into the partition ring 14 by the blades and discharged while being agitated. The front surface of the air outlet 10a becomes negative pressure due to the water flow, air is sucked out from the atmosphere through the air chamber 11 and the air supply pipe 12, is introduced into the partition ring 14, passes through, and forms an air flow AF in the water flow WF, Water flow WF
The wave WFW cuts the air from the airflow AF, turns it into fine particles, and moves forward while mixing with the water.

(Effects of the Invention) As described above, the present invention provides a draft ring to surround the blade of a water flow generator that rotates the blade to generate a water flow, and a partition ring is provided in the middle of the blade concentrically with the rotation axis. Since air is introduced into the partition ring, as the blades rotate, the water around the pedestal is sucked into the draft ring by the blades and stirred to generate a water flow, and a water flow is also generated inside the partition ring. Since air is introduced into the ring and passes through, the density of water at the tip of the blade is not disturbed by the air, and is the same both above and below, resulting in a good balance of the blades, which reduces the flow velocity of the water flow and prevents vibrations from occurring in the blades. Air currents are formed in the water stream, and the air is cut off by the waves of the water stream, becoming fine particles and moving forward while mixing with the water, causing air to mix in the water as fine particles over a wide area. , biological decomposition proceeds smoothly.

[Brief explanation of drawings]

The figures all show one embodiment of the present invention, with Figure 1 being a partially sectional side view, Figure 2 being a front view seen from ■ to ■ in Figure 1, and Figure 3 being a sliding ring. 10 is a perspective view of FIG. DESCRIPTION OF SYMBOLS 1...Water flow generator, 2...Blade, 10a...Air outlet, 11...Air chamber, 12...Air supply pipe, 14
... Bulkhead ring, 15... Draft ring

Claims (1)

[Claims] A draft ring is provided to surround the blades of a water flow generator that generates water flow by rotating the blades, a partition ring is provided in the middle of the blade concentrically with the rotating shaft, and air is introduced into the partition ring. An aeration stirring device characterized by: