JPH0321240B2 - - Google Patents

Description

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

(Prior art) Conventionally, in treatment tanks of sewage treatment equipment that use 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, and a system that performs diffused aeration by blowing pressurized air causes the bubbles to become large and come into contact with gas and liquid. was not done enough.

(Means for solving the problem) The shaft end of the rotary shaft of the blade of a water flow generator that generates a water flow by rotating the blade provided on the rotary shaft is made hollow with an open end, and the shaft end is made hollow with an open end. A blade member that communicates with the outer periphery is screwed onto the blade member, and a cylindrical rectifying ring that is open toward the front is formed slightly outside the outer periphery of the blade member. An air chamber is provided by sealing the shaft, an air supply pipe is communicated with the air chamber from the outside, a communication hole is bored in the rotating shaft to communicate the hollow part with the air chamber, and the hollow part of the rotating shaft is connected with the air chamber. A water intake hole was provided to communicate with the outside.

(Function) As described above, air in the hollow part of the shaft is sucked out by the blade member provided at the shaft end of the rotary shaft during the swirling water flow generated by the water flow generator, and a portion of the outer circumference of the blade member is sucked out. The air is pushed forward by the rectifying ring provided on the outside, creating an air flow in the jet swirling flow, and the air is cut off from the air flow by the waves of the jet flow, turning it into fine particles in the water. The air moves forward for a long distance while mixing with the water, and the air becomes fine particles and mixes into the water over a wide area.

(Example) Examples of the drawings will be described below. For convenience of explanation,
The left and right sides in FIG. 1 are called "front" and "back".

Reference numeral 1 denotes a water flow generator that generates water flow by rotating the blades of an axial flow pump or the like, which is placed horizontally.
A rotating shaft 3 is fixed by a friction ring 4 and bolts 5.

The water flow generator 1 is fixed to a pedestal 6, and the pedestal 6
Lifting members 6a and 6b are vertically slidably fitted to a guide bar 7 installed in a treatment tank of a sewage treatment plant, and a chain 15 attached to the upper part of a pedestal 6 is lifted and lowered by a chain hoist (not shown). It is as follows.

8 is a mechanical seal of the motor shaft 1c, 9 is a sliding ring, and the tip recess 1 of the pump body 1a.
The space between the peripheral wall b and the rotating shaft 3 of the blade 2 is an air chamber 10. Reference numeral 11 is an air supply pipe that communicates with the air chamber 10.

The rotating shaft 3 is hollow with an open end, and a blade member 12 is screwed onto the end. In the blade member, a plurality of blades 12a and blades 12b are integrally provided alternately in a passage communicating from the center to the outer periphery.
A cylindrical straightening ring 3b that is open toward the front is fixed to the rotating shaft 3 slightly outside the outer periphery of the blade member 12. A plurality of protrusions 3c are provided inside the rectifying ring 3b to prevent the air from being ejected forward due to centrifugal force caused by rotation between the rectifying ring 3b and the blade member 12. Several communication holes 13 are bored near the rear of the rotating shaft 3 to communicate the hollow portion 3a of the rotating shaft 3 with the air chamber 10.

Further, a water intake hole 14 is bored in the rotating shaft 3 in front of the air chamber 10 to communicate the hollow part 3a with the outside.

A draft ring 16 is fixed to the frame 6 so as to surround the blade 2, and serves as a guide to increase the efficiency at the tip of the blade 2 and to generate a strong jet swirl flow JF. If the treatment tank is small or has a lot of foreign matter, it may not be necessary to use a draft ring.

Reference numeral 17 is a power supply cable of the water flow generator 1 connected to a ground power source (not shown). P is a treatment tank in a sewage treatment plant, AF is an air flow, and JFW is a jet swirl flow.
The JF wave is generated between the air flow AF.

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 16 by the blades 2 and is stirred, forming a strong jet swirl flow JF forward. pushed out.

When the blade 2 rotates, a blade member screwed onto the tip of the rotating shaft 3 of the blade 2 rotates integrally. When the blade member 12 rotates, the blade rotates the rotation shaft 3.
Air is sucked in through the hollow portion 3a, the air chamber 10, and the air supply pipe 11.

Hollow part 3a of rotating shaft 3 during jet swirl flow JF
Air is supplied from the jet flow JF to form a swirling air flow AF, and from the air flow AF the swirling jet flow wave JFW cuts off the air and mixes it into the water as fine particles. Move forward a long distance. In addition, when driven continuously, a water flow is created in the direction of the jet swirl flow, and the water mixed with fine air particles moves over a wider area, resulting in sufficient gas-liquid mixing and smooth biological decomposition over a wide area. do.

(Effects of the Invention) As described above, the present invention provides a water flow generator in which a water flow is generated by rotating the blades provided on the rotation shaft. The communicating blade members are screwed together to form a cylindrical rectifying ring slightly outside the outer periphery of the blade member that is open to the front side, and the front and rear are sealed between the rotating shaft and the main body of the water flow generator to form an air chamber. An air supply pipe is connected to the air chamber from the outside, and a communication hole is bored in the rotating shaft to communicate the hollow part with the air chamber.As a result, a water flow is generated by the rotation of the blade, and in the water flow, The air in the hollow part of the shaft is sucked out by the blade member installed at the end of the rotating shaft, and the air is pushed forward by the rectifying ring installed slightly outside the outer periphery of the blade member, creating an air flow in the water flow. The waves of the swirling water current cut the air from the airflow and mix it into the water as fine particles, which then move forward over a large distance, and the continuously driven water current moves over a wide area, causing the air to become airless. Sufficient liquid mixing occurs, and biological decomposition over a wide range proceeds smoothly.

[Brief explanation of the drawing]

The drawings all show an embodiment of the present invention, in which Fig. 1 is a partially sectional side view, Fig. 2 is a front view seen from ~ in Fig. 1, and Fig. 3 is a ~ in Fig. 1. FIG. In the figure, 1 is a water flow generator, 2 is a blade, 3 is a rotating shaft, 3a is a hollow part, 3b is a rectifying ring, 10 is an air chamber, 11 is an air supply pipe, 12 is a blade member, 13 is a communication hole, 16 is a draft ring.

Claims (1)

[Claims] 1 The shaft end of the rotary shaft of a water flow generator that generates a water flow by rotating the blades provided on the rotary shaft is hollow with an open tip, and a blade member communicating from the center to the outer periphery is installed at the tip of the hollow portion. A cylindrical rectifying ring opened to the front side is formed slightly outside the outer periphery of the blade member by screwing, and an air chamber is provided between the rotating shaft and the pump body by sealing the front and rear sides, and the air chamber is formed between the rotating shaft and the pump body. An air supply pipe is connected to the chamber from the outside, a communication hole is bored in the rotating shaft to communicate the hollow part with the air chamber, and a water intake hole is further provided to communicate the hollow part of the rotating shaft with the outside. Aeration stirring device.