JPH0538423A - Gas dissolving device - Google Patents

Abstract

(57) [Summary] [Purpose] A large amount of air is supplied to the water with less electric power without rotating the impeller at high speed with an excessive amount of electric power, and the amount of dissolved oxygen is effectively increased. [Structure] The hollow portion 2 is provided inside each blade 23 of the impeller 20.
4, the slit-shaped exhaust port 25 is formed at the trailing edge portion 23a of each blade 23, and the inside of the hollow tube 12 into which the outside air flows and the hollow portion 24 of each blade are the exhaust port of each blade trailing edge portion 23a. 25
The outside air introduced by the rotation of the impeller in water is discharged through the inside of the hollow tube 12 and the hollow portion 24 of each blade to the exhaust port 25 at the trailing edge of each blade, and the impeller 20 It is configured to mix and dissolve with the water disturbed by the rotation of the.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas dissolving apparatus for injecting and mixing gas in a liquid, and more particularly to an apparatus for supplying air into water to increase the amount of dissolved oxygen in water. This device is mainly effective in treating wastewater or supplying oxygen to aquaculture water in fish farms.

When treating wastewater, air is supplied to the wastewater to increase the amount of dissolved oxygen to accelerate the activity of aerobic microorganisms, suppress the production of organic substances, and remove harmful pollutants. The process of decomposing is well known, and the gas dissolving device is very effective in such a biological process.

[0003]

2. Description of the Related Art As a conventional gas dissolving device, Korean Patent No.
32293 and Korean Utility Model Registration No. 25563 are known. This device connects the upper end of a hollow tube with an air inlet formed above to the motor shaft, attaches an impeller to the lower part of the hollow tube, positions the impeller deep in water, and then rotates it at high speed to forward the impeller. It is a device that mixes air and water by generating a spiral water flow into the inside of the hollow tube, sucking the outside air from the air inlet of the hollow tube and supplying it to the water through the hole below the hollow tube.

By the way, according to these devices, the impeller must be rotated at a high speed in order to allow the outside air to sufficiently flow into the water and be mixed, and the motor must be operated for a long time. There is a drawback that the load is increased and the amount of electricity consumption is increased.

[0005] In practice, wastewater is discharged without being completely treated, and the pollution of rivers becomes worse because electric power in a biological treatment process in which air is mixed with wastewater by a business owner of a factory or a wastewater treatment company that discharges wastewater. The main reason for this is that the costs are so large that they often do not go well with this process, or they often skip this process.

[0006]

SUMMARY OF THE INVENTION In view of the problems of the prior art as described above, the present invention reduces the load on the motor,
The present invention aims to provide a device that supplies a large amount of air into water with less electric power to effectively increase the amount of dissolved oxygen.

[0007]

SUMMARY OF THE INVENTION According to the present invention, the inside of each blade of an impeller is formed hollow, and a slit-shaped exhaust port is formed at the trailing edge of each blade, and the inside of a hollow tube into which outside air flows and the impeller. The hollow part inside each blade is formed to ventilate each other,
Due to the rotation of the impeller in water, the outside air flowing in through the air inlet of the hollow tube is exhausted from the exhaust port at the trailing edge of each blade through the inside of the hollow tube and the inside of each blade of the impeller, and is disturbed by the rotation of the impeller. It is configured to be mixed with and dissolved in water that has been prepared.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

According to the present invention, a hollow portion 24 is formed inside each blade 23 of the impeller 20, and a slit-shaped exhaust port 25 is formed at each trailing edge portion of each blade 23 so that the outside air flowing into the hollow pipe 12 can be prevented. The most characteristic feature is that the structure is such that the blades are discharged into water through the respective exhaust ports 25 of the trailing edge portions 23a and dissolved in water. Here, the exhaust port 25
May have a shape other than the slit shape, for example, a shape in which a plurality of round openings, long openings, etc. are arranged.

The impeller 20 is fixed to the lower end of the hollow tube 12, and an opening 22 is formed in a boss 21 (a blade mounting portion) of the impeller so as to communicate with a hollow portion 24 inside each blade. The inside of the hollow tube 12 and the hollow portion 24 inside each blade are continuously formed so as to communicate with the exhaust port 25 at the trailing edge of each blade, and the lower part of the impeller boss 21 is opened and closed.

The upper end of the hollow tube 12 is rotatably connected to the motor shaft 2, and an air inlet 11 is formed near the upper end of the hollow tube 12.

According to the present invention having such a configuration, when the impeller 20 starts rotating in water by driving the motor 1, a swirl is generated behind each trailing edge of each blade 23 of the impeller, and the outside air is the air flow of the hollow tube. It flows in from the inlet 11, passes through the inside of the hollow tube 12 and the hollow portion 24 inside each blade, and is discharged into the water through the respective exhaust openings 25 formed in the trailing edge portion 23a of each blade in a slit shape, forming bubbles. The impeller 20 mixes with the water disturbed and becomes dissolved.

In the present invention, the outside air is the trailing edge portion 2 of each blade.
By being discharged through the exhaust port 25 located at 3a, a bubble is generated behind each blade 23, and the bubble further collides with the front surface of the next rotating blade. As a result, the particles are further miniaturized, and the mixing ratio of air and water is increased accordingly.

In the practice of the present invention, the amount of air flowing into the water can be adjusted according to the rotational speed of the impeller 20 and the size and arrangement of the blades 23, so that the rotational speed of the impeller 20 can be adjusted according to the required amount of air. Feather 23
The shape and arrangement form of can be appropriately modified within the scope of the present invention.

If necessary, a plurality of impellers 20, 20 ', 20 "may be provided under the hollow tube 12 as shown in FIG.
It is also possible to attach the boss, but in this case, the lower boss of the impeller 20 attached to the outermost end of the hollow tube is closed, but the bosses of the other impellers 20 ', 20 "are freely ventilated. Of course, it must be open to the public.

[0016]

According to the present invention, the outside air flowing from the hollow tube 12 passes through the hollow portion 24 formed inside each blade of the impeller 20 and then through each exhaust port 25 formed at the trailing edge portion 23a of each blade. By having a structure designed to be discharged into water, there is an effect that the amount of air injected into water can be significantly increased and the water can be effectively dissolved in water without rotating the impeller 20 at a high speed.

Therefore, according to the present invention, it is possible to obtain a very high oxygen dissolution effect with less electric power than the conventional one while taking a relatively simple structure, and it is possible to reduce noise due to driving of the motor.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of impeller blades according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of an impeller and a hollow tube according to an embodiment of the present invention.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a cross-sectional view showing a moving state of water and inflowing air accompanying movement of each blade of the impeller of the embodiment of the present invention.

FIG. 5 is a schematic view showing another embodiment of the present invention.

FIG. 6 is a schematic view of a usage state of the device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Motor 2 ... Motor shaft 11 ... Air inlet 12 ... Hollow tube 20 ... Impeller 21 ... Impeller Boss 22 ... Opening 23 ... Blade 23a ... Blade trailing edge 24 ... Hollow part inside blade 25 ... Exhaust port

Claims (6)

[Claims] 1. A gas dissolving device in which an upper end of a hollow pipe having an air inlet formed above is connected to a motor shaft, an impeller is attached to a lower portion of the hollow pipe, and the impeller is rotated by driving a motor. A hollow portion is formed inside each of the blades, an exhaust port is formed at the trailing edge of each of the blades, and an opening that communicates with the hollow portion inside each of the blades is formed in the boss of the impeller. The hollow portion inside the tube and the inside of each blade is configured to continuously ventilate with the exhaust port of the trailing edge portion of each blade, and the outside air that has flowed into the hollow tube passes through the hollow portion inside each blade to A gas dissolving device characterized in that it is discharged into water through an exhaust port at the trailing edge of each blade to be mixed with water and dissolved. 2. The gas dissolving device according to claim 1, wherein the exhaust port is formed in a slit shape. 3. The gas dissolving apparatus according to claim 1, wherein the impeller is fixed to a lower end of the hollow tube. 4. The gas dissolving apparatus according to claim 1, wherein a lower portion of the impeller boss is hermetically sealed. 5. The gas dissolving apparatus according to claim 1, wherein a plurality of the impellers are attached to a lower portion of the hollow tube. 6. The lower part of the boss of the impeller attached to the outermost end of the lower stage of the hollow tube is hermetically sealed, and the bosses of other impellers mounted above the boss are open to allow ventilation. The gas dissolving device according to claim 5, wherein.