CN114409102A

CN114409102A - Submersible aerator with disrotatory oblique flow impeller

Info

Publication number: CN114409102A
Application number: CN202210001312.9A
Authority: CN
Inventors: 田丽梅; 徐浩然; 赵杰; 田伟; 商延赓
Original assignee: Jilin University
Current assignee: Jilin University
Priority date: 2022-01-04
Filing date: 2022-01-04
Publication date: 2022-04-29
Anticipated expiration: 2042-01-04
Also published as: CN114409102B

Abstract

The invention discloses a submersible aerator with contra-rotating oblique flow impellers, which is characterized in that contra-rotating oblique flow impellers are placed in a reverse-normal opposite mode and run cooperatively, the impellers are inverted above the impellers aiming at air blowing and air feeding, and the impellers are placed in a normal mode below the impellers aiming at water flow stirring, firstly, the oblique profiles of the blades of the impellers expand the area of the water flow stirring, the outer sides of the blades have guidance, and the water flow is conveyed to the outer side after the blades rotate, so that the formed maximum area is increased; secondly, a large number of vent holes are formed in the surface of the hub of the upper oblique flow impeller, air blowing and air feeding are more targeted, a small number of vent holes are formed in the same position of the lower oblique flow impeller, and bubbles are enabled to adhere to other substances in sewage as little as possible in the process of rising along the surface, so that the drag reduction effect is achieved; gas exports from the pipe to automatic upwards emitting of aquatic, rotates through top oblique flow impeller blade and claps the pressure downwards, and below impeller rotates the trend to upwards lifting to rivers, forms the mixed region, further promotes the efficiency that air and rivers mix.

Description

Submersible aerator with disrotatory oblique flow impeller

Technical Field

The invention belongs to the technical field of submersible aerators.

Background

With the advance of industrialization and urbanization, China faces two major problems of water resource shortage and water pollution. The sewage treatment equipment can effectively solve the problem of water pollution caused by people's life and industrial production, thereby improving the ecological environment of rivers and lakes and the living environment of residents. The aerator is an important component of sewage treatment equipment, strengthens the contact of organic matters, microorganisms and dissolved oxygen in the sewage by injecting air into the sewage, promotes the aerobic respiration of the microorganisms to decompose the organic matters in the sewage tank, and enables the organic matters to be mineralized, thereby achieving the aim of purifying the water quality.

At present, more than 40 patented products exist, such as: a pump type impeller surface aerator, an OZBG compound blade energy-saving aerator, a high-power inverted umbrella aerator, a rotary brush aerator, a surface aerator, a propeller aerator, a submersible aerator, a diversion aerator, a rotary brush aerator, a booster aerator and the like. The submersible aerator has the advantages of simple structure, strong oxygenation capacity, high power efficiency and the like, and therefore, the submersible aerator becomes a common surface aeration device for sewage treatment plants.

The submersible aerator has the advantages of simple structure, strong oxygenation capacity, high power efficiency and the like, thereby becoming the common surface aeration equipment of a sewage treatment plant. The rotation of the impeller causes ambient water to flow through the outlet to the ambient water space, which in turn flows around the impeller, causing air to be entrained in the water during this process.

The technical scheme of the prior submersible aerator has the following defects:

1. the prior art scheme is that an underwater impeller motor drives an underwater impeller to rotate so as to drive water flow in a sewage pool, impeller blades are regularly arranged and rotate to form a regular cylinder, the effective range generated around is the nearby circumferential area of the rotation of the impeller blades, and the effective aeration area is limited;

2. the aerator only uses one impeller, and the outer surface of the impeller is a coherent entity, so that the surface is easy to be roughened gradually after long-time operation, the resistance is increased, the efficiency of mixed water airflow is reduced, and energy is not saved;

3. the air blowing and air feeding port of the aerator is arranged right below the impeller device, air bubbles are randomly floated up after being vertically output and are mixed with water flow, and the aeration efficiency is not high.

Disclosure of Invention

In order to solve the problems, the invention provides a submersible aerator with a contra-rotating oblique flow impeller, which consists of a motor 1, a floating ball 2, an oblique flow drainage impeller 3, an oblique flow air compression impeller 4, a main shaft 5, an air delivery pipe 6, an air inlet device 7, a mixing cavity 8 and a sewage inlet device 9,

the floating ball 2 is connected with a mounting platform of the aerator, so that the mounting platform floats on the water surface, the motor 1 is arranged at the topmost end of the aerator, the motor 1 is connected with the upper end of a main shaft 5, the lower part of the main shaft 5 is fixedly provided with an oblique flow drainage impeller 3 and an oblique flow air compression impeller 4 which have the same shape and are opposite in mounting direction, and the motor 1 drives the oblique flow drainage impeller 3 and the oblique flow air compression impeller 4 to rotate relatively to work;

the air inlet device 7 is arranged on the mounting platform below the motor 1, an air suction impeller 7-1 is arranged in the air inlet device 7, and the air suction impeller 7-1 is fixedly connected with the main shaft 5; the spindle 5 is sleeved with a gas pipe 6, the spindle 5 is of a hollow structure and is provided with a plurality of through holes communicated with the gas pipe 6;

the main shaft 5 is also provided with vent holes communicated with the hubs of the oblique flow drainage impeller 3 and the oblique flow air compression impeller 4, the hubs of the oblique flow drainage impeller 3 and the oblique flow air compression impeller 4 and the main shaft 5 respectively form a cavity, and the hubs of the oblique flow drainage impeller 3 and the oblique flow air compression impeller 4 are provided with a plurality of vent holes; the mixing cavity 8 is arranged at the outer sides of the oblique flow drainage impeller 3 and the oblique flow air compressing impeller 4; the sewage inlet device 9 is arranged above the mixing cavity 8, a water inlet impeller 9-1 connected with the main shaft 5 is arranged in the sewage inlet device 9, sewage is sucked into the mixing cavity 8 from the sewage inlet device 9 and is mixed with air and discharged, and aeration is completed.

The main shaft 5 adopts a group of three vertically arranged round holes with the big holes of which the sizes are all 20mm at the air compressing oblique flow impeller, the interval is 3mm, and the trisection circumference of the pipe is divided into three groups of vertically arranged round holes with the same specification; two circular holes with the same specification are arranged at the drainage oblique flow impeller and are also divided into three groups.

The hub of the oblique flow air compressing impeller 4 is provided with a large number of vent holes which are regularly arranged, the diameter of the size is 5mm, the same part of the oblique flow water discharging impeller 3 is provided with a small number of vent holes with the same size,

the vertical direction is the y-axis, the horizontal direction is the x-axis and the z-axis, the x-coordinate is zero, a fitting curve is carried out according to the y-coordinate and the z-coordinate, and the wheel hub surface curve equations of the two oblique flow impellers are as follows: and z is-0.00247292867051352 y2-0.973410945022914y-29.0786789765909, and the curve equation of the blade surface is as follows: z-0.00377471353412184 y2+1.68313037415848y + 65.4513408505558.

The invention has the beneficial effects that:

the invention uses contra-rotating oblique flow impellers which are arranged in a reverse-normal opposite mode and run in a coordinated mode, the upside-down impellers aim at blowing and air feeding, the downside-normal impellers aim at stirring water flow, firstly, the oblique outline of the impeller blades is enlarged, the area of the stirring water flow is enlarged, the outer sides of the blades have guidance, the water flow is conveyed to the outer side after rotating, and the area of the maximum circular area of the formed outer side is increased;

secondly, the interior of the impeller is hollow, the wall of the gas transmission pipe 6 is provided with a large hole, a large number of small holes are formed above the root part of the blade on the surface of the upper oblique flow impeller, the air blowing and gas transmission are more targeted, a small number of small holes are formed at the same position of the lower oblique flow impeller, and bubbles are enabled to adhere to other substances in the sewage as little as possible in the process of rising along the surface, so that the resistance reduction effect is achieved;

and finally, the gas is output from the pipe to automatically upwards emerge in water, the gas is downwards pressed by rotating the blades of the upper oblique flow impeller, and the lower impeller rotates to tend to upwards lift the water flow to form a mixing area, so that the efficiency of mixing the air and the water flow is further improved. The problem that present aeration machine effective area is little, and the energy consumption is high, aeration inefficiency can effectively be solved to this scheme of application.

Drawings

Fig. 1 is a structural view of a submersible aerator with a contra-rotating inclined-flow impeller according to the present invention;

FIG. 2 is a cross-sectional view E-E of FIG. 1;

FIG. 3 is a partial view of the construction of the diagonal flow drainage impeller and the diagonal flow compressor impeller;

FIG. 4 is a cross-sectional view taken along line D-D of FIG. 3;

FIG. 5 is a schematic view of a diagonal flow impeller hub curve;

FIG. 6 is a schematic view of a diagonal flow impeller blade curve.

Detailed Description

The technical solution of the present invention is further explained below in the form of specific examples.

As shown in fig. 1, the submersible aerator with counter-rotating oblique flow impeller in this embodiment is mainly composed of a motor 1, a floating ball 2, an oblique flow drainage impeller 3, an oblique flow air compression impeller 4, a main shaft 5, an air pipe 6, an air inlet device 7, a base 8, a mixing chamber 8 and a sewage inlet device 9,

the air inlet device 7 is arranged on the mounting platform below the motor 1, an air suction impeller 7-1 is arranged in the air inlet device 7, and the air suction impeller 7-1 is fixedly connected with the main shaft 5; the spindle 5 is sleeved with a gas pipe 6, the spindle 5 is of a hollow structure and is provided with a plurality of through holes communicated with the gas pipe 6; the main shaft 5 is also provided with vent holes communicated with the hubs of the oblique flow drainage impeller 3 and the oblique flow air compression impeller 4, the hubs of the oblique flow drainage impeller 3 and the oblique flow air compression impeller 4 and the main shaft 5 respectively form a cavity, and the hubs of the oblique flow drainage impeller 3 and the oblique flow air compression impeller 4 are also provided with a plurality of vent holes; the mixing cavity 8 is arranged at the outer sides of the oblique flow drainage impeller 3 and the oblique flow air compressing impeller 4; the sewage inlet device 9 is arranged above the mixing cavity 8, a water inlet impeller 9-1 connected with the main shaft 5 is arranged in the sewage inlet device 9, sewage is sucked into the mixing cavity 8 from the sewage inlet device 9 and is mixed with air and discharged, and aeration is completed.

As shown in fig. 2, the center of the gas pipe 6 is provided with a main shaft, the main shaft is connected with the two impellers and plays a role in transmitting power, the main shaft is of a hollow structure, the inner diameter of the gas pipe 6 is 250-300mm, preferably 300mm, and the large hole on the central gas pipe 6 can be circular, square or rhombic, preferably circular; two air-compressing oblique flow impellers and two water-discharging oblique flow impellers which are oppositely and correspondingly arranged are arranged at the bottom of the main shaft and rotate relatively to work,

as shown in fig. 3 and 4, the hub and blade profiles of the two diagonal flow impellers have a y-axis in the vertical direction and an x-axis and a z-axis in the horizontal direction, the x-coordinate is zero in this state, a curve is fitted according to the y-coordinate and the z-coordinate, and the hub surface curve equation is as follows: and z is-0.00247292867051352 y2-0.973410945022914y-29.0786789765909, and the curve equation of the blade surface is as follows: z-0.00377471353412184 y2+1.68313037415848y + 65.4513408505558.

The hub of the oblique flow air compression impeller 4 is provided with a large number of regularly arranged vent holes with the diameter of 5mm, the same part of the oblique flow water drainage impeller 3 is provided with a small number of vent holes with the same size, the purpose is to output a large amount of air on the hub surface of the oblique flow air compression impeller 4 at the upper part, the pertinence is achieved, bubbles are pressed downwards by the rotation of the impeller in the natural rising process, the surface of the oblique flow water drainage impeller 3 also generates a small amount of air bubbles to adhere other sewage substances to the surface as little as possible in the process of rising along the surface, the effect of reducing drag is achieved, and then the process of rising the water flow upwards by the oblique flow water drainage impeller 3 meets the air which is pressed downwards to carry out mixed aeration more efficiently.

Claims

1. A submersible aerator with contra-rotating oblique flow impellers comprises a motor (1), a floating ball (2), an oblique flow drainage impeller (3), an oblique flow air compressing impeller (4), a main shaft (5), an air conveying pipe (6), an air inlet device (7), a mixing cavity (8) and a sewage inlet device (9),

the floating ball (2) is connected with a mounting platform of the aerator, so that the mounting platform floats on the water surface, the motor (1) is arranged at the topmost end of the aerator, the motor (1) is connected with the upper end of the main shaft (5), the lower part of the main shaft (5) is fixedly provided with an oblique flow drainage impeller (3) and an oblique flow air compression impeller (4) which have the same shape and are opposite in mounting direction, and the motor (1) drives the oblique flow drainage impeller (3) and the oblique flow air compression impeller (4) to rotate relatively to work;

the air inlet device (7) is arranged on the mounting platform below the motor (1), an air suction impeller (7-1) is arranged in the air inlet device (7), and the air suction impeller (7-1) is fixedly connected with the main shaft (5); the air delivery pipe (6) is sleeved outside the main shaft (5), the main shaft (5) is of a hollow structure, and is provided with a plurality of through holes communicated with the air delivery pipe (6);

the main shaft (5) is also provided with vent holes communicated with hubs of the oblique flow drainage impeller (3) and the oblique flow air compression impeller (4), the hubs of the oblique flow drainage impeller (3) and the oblique flow air compression impeller (4) and the main shaft (5) enclose a cavity respectively, and the hubs of the oblique flow drainage impeller (3) and the oblique flow air compression impeller (4) are provided with a plurality of vent holes; the mixing cavity (8) is arranged at the outer sides of the oblique flow drainage impeller (3) and the oblique flow air compression impeller (4); the sewage inlet device (9) is arranged above the mixing cavity (8), a water inlet impeller (9-1) connected with the main shaft (5) is arranged in the sewage inlet device (9), sewage is sucked into the mixing cavity (8) from the sewage inlet device (9) to be mixed with air and discharged, and aeration is completed.

2. The submersible aerator with contra-rotating oblique flow impeller according to claim 1, wherein the main shaft (5) adopts a group of three large through holes vertically arranged at the air compressing oblique flow impeller, and the trisection circumference of the pipe is divided into three groups of round holes vertically arranged with the same specification; two holes are formed at the drainage oblique flow impeller, and the holes are also divided into three groups.

3. The submersible aerator with contra-rotating inclined flow impellers of claim 2, wherein the through holes are all circular holes with the size of 20mm in diameter and are spaced by 3 mm.

4. The submersible aerator with contra-rotating oblique flow impellers of claim 1, wherein a hub of the oblique flow air compressor impeller (4) is provided with a large number of regularly arranged vent holes, and the same part of the oblique flow water drainage impeller (3) is provided with a small number of vent holes with the same size.

5. The submersible aerator with contra-rotating inclined flow impellers of claim 4, wherein the size diameter of the vent holes is 5 mm.

6. The submersible aerator with contra-rotating inclined flow impellers of claim 1, wherein the vertical direction is the y-axis, the horizontal direction is the x-axis and the z-axis, the x-coordinate is zero, a curve is fitted according to the y-coordinate and the z-coordinate, and the surface curve equation of the hubs of the two inclined flow impellers is as follows: and z is-0.00247292867051352 y2-0.973410945022914y-29.0786789765909, and the curve equation of the blade surface is as follows: z-0.00377471353412184 y2+1.68313037415848y + 65.4513408505558.