Aeration system for wastewater treatment tank

Abstract

An aeration system for a wastewater treatment tank, comprising a driving mechanism (1), which drives a downwardly-extending main shaft (2), wherein the main shaft (2) is divided into an upper section and a lower section, the upper section and the lower section respectively being provided with an upper spiral blade (31) and a lower spiral blade (32) which rotate in opposite clockwise directions; the outside of the main shaft (2) is further surrounded by a sleeve (4) coaxial with the main shaft (2), an upper spiral channel and a lower spiral channel respectively being formed between the inner wall of the sleeve (4) and the upper and lower spiral blades (31, 32); the sleeve (4) is fixed relative to a housing of the driving mechanism (1), and the upper end of the sleeve (4) is provided with an air inlet (40); the inside of the sleeve (4) is provided with a sealing plate (5) located between the upper and lower spiral blades (31, 32), the sealing plate (5) being provided with jet holes (50) in the axial direction of the main shaft (2); and below the sealing plate (5), the sleeve (4) is in lateral communication with two or more diffusion tubes (6), said diffusion tubes (6) being circumferentially uniformly distributed around the main shaft (2). The system can force air and wastewater to mix, and thus has a higher oxygen dissolution efficiency.

Description

Sewage treatment tank aeration system Technical Field

[0001] The present invention relates to the field of sewage treatment systems, in particular to an aeration system for a sewage treatment tank. Background Art

[0002] In the field of sewage treatment, sewage treatment pools are usually required. For some pollutants that need to rely on oxygen to decompose, it is necessary to ensure that there is sufficient oxygen in the treatment pool to promote the treatment effect. For this reason, jet aerators are currently commonly used to aerate the treatment pool. The basic principle is to use a centrifuge to generate a jet in the pool. The negative pressure generated by the jet pulls the outside air, so that the air and the jet enter the diffusion tube together to mix and discharge into the pool. This type of jet aerator relies solely on the negative pressure of the jet to pull the airflow, and allows the air and jet to mix freely in the diffusion tube. Due to the lack of coercive force, the mixing efficiency is very limited. A large amount of air cannot quickly dissolve in the water after entering the pool, and floats to the surface in the form of large bubbles, resulting in limited efficiency in dissolving oxygen in the sewage treatment pool, while the noise of the rolling bubbles is very loud.

[0003] Summary of the Invention

[0004] In view of the above problems, the object of the present invention is to provide an aeration system for a sewage treatment pool, which can forcibly dissolve air and sewage and has a high oxygen dissolution efficiency.

[0005] The technical solution adopted by the present invention to solve its technical problems is: the sewage treatment pool aeration system includes a driving mechanism, which drives a main shaft extending downward; the main shaft is divided into an upper and lower section, and the upper section and the lower section are respectively provided with an upper spiral wing and a lower spiral wing extending along the main shaft, and the upper spiral wing and the lower spiral wing rotate in opposite clockwise directions; the outside of the main shaft is also surrounded by a sleeve coaxial with the main shaft, and an upper spiral channel is formed between the inner wall of the sleeve and the upper spiral wing, and a lower spiral channel is formed between the inner wall of the sleeve and the lower spiral wing; the sleeve is relatively fixed to the shell of the driving mechanism, and the upper end of the sleeve has an air inlet; inside the sleeve, a sealing plate is provided between the upper spiral wing and the lower spiral wing, and a spray hole is opened on the sealing plate along the axial direction of the main shaft; the sleeve is laterally connected to two or more diffusion pipes below the sealing plate, and the diffusion pipes are evenly distributed about the circumference of the main shaft.

[0006] Preferably, the driving mechanism includes an electric motor or an internal combustion engine, and an acceleration gear set.

[0007] Preferably, the pitch of the upper helical wing is smaller than the pitch of the lower helical wing.

[0008] Preferably, the sealing plate and the main shaft are fixed to each other.

[0009] Preferably, a circuit breaker is also fixed on the main shaft, and the circuit breaker includes shielding plates that are evenly distributed circumferentially and have the same number as the diffusers, and the outer side surfaces of the shielding plates are arc-shaped surfaces that fit the inner wall of the sleeve; during the process of the circuit breaker rotating one circle following the main shaft, each shielding plate blocks the connecting opening between each diffuser and the sleeve once, and the connecting openings between each diffuser and the sleeve are always blocked and opened at the same time.

[0010] The beneficial effects of the present invention are as follows: when the sewage treatment pool aeration system is working, the main shaft and sleeve are inserted into the sewage treatment pool, so that the diffusion tube is immersed in the pool; when the driving mechanism drives the main shaft to rotate at high speed, since the upper spiral wing and the lower spiral wing on the main shaft rotate in opposite clockwise directions, the upper spiral wing drives the upper air to be pressed downward along the axis inside the sleeve, while the lower spiral wing drives the pool water below to be pressed upward along the axis inside the sleeve; so that a high-pressure environment is formed in the middle of the sleeve, and under this high-pressure environment, the downward-pressed air passes through the spray hole on the sealing plate to form a high-pressure air needle, which directly penetrates into the upward-pressed pool water. Due to the high pressure and the large surface area of ​​the high-pressure air needle, the air and liquid are forced to merge, and the mixing effect is excellent. Thereafter, the air is discharged from the diffusion tube on the side of the sleeve into the pool, and the gas-liquid fusion of the traditional process is further obtained in the diffusion tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] FIG1 is a schematic diagram of a first embodiment of the aeration system for a sewage treatment tank.

[0012] FIG2 is a schematic diagram of a second embodiment of the aeration system for a sewage treatment tank.

[0013] FIG3 is a schematic structural diagram of the main shaft, the circuit breaker, and the sleeve in the embodiment of FIG2 . DETAILED DESCRIPTION

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0015] Example 1:

[0016] In the first embodiment shown in FIG1 , the aeration system for the sewage treatment tank includes a driving mechanism 1, which includes a motor and an acceleration gear set, which drives a main shaft 2 extending downward; the main shaft is divided into an upper and lower sections, and the upper and lower sections are respectively provided with an upper spiral wing 31 and a lower spiral wing 32 extending along the main shaft, and the upper spiral wing 31 and the lower spiral wing 32 rotate in opposite clockwise directions; the main shaft 2 is further surrounded by a sleeve 4 coaxial with the main shaft, and an upper spiral wing 31 is formed between the inner wall of the sleeve 4 and the upper spiral wing 31. A spiral channel is formed between the lower spiral wing 32; the sleeve 4 is relatively fixed to the shell of the driving mechanism 1, and the upper end of the sleeve 4 has an air inlet 40; inside the sleeve 4, a sealing plate 5 is provided between the upper spiral wing 31 and the lower spiral wing 32, and a spray hole 50 is opened on the sealing plate 5 along the axial direction of the main shaft; the sleeve 4 is laterally connected to two or more diffusers 6 below the sealing plate 5 (Figure 1 is a cross-sectional view, which only illustrates two diffusers 6), and the diffusers 6 are evenly distributed around the main shaft 2.

[0017] When the above-mentioned sewage treatment pool aeration system is in operation, the main shaft 2 and sleeve 4 are inserted into the sewage treatment pool so that the diffusion tube 6 is below the liquid level of the treatment pool as shown by the horizontal dotted line in Figure 1; when the driving mechanism 1 drives the main shaft 2 to rotate at high speed, since the upper spiral wing 31 and the lower spiral wing 32 on the main shaft 2 rotate in opposite clockwise directions, the upper spiral wing 31 drives the upper air to press down along the axis inside the sleeve 4, while the lower spiral wing 32 drives the pool water below to press up along the axis inside the sleeve 4; so that a high-pressure environment is formed in the middle of the sleeve 4. Under this high-pressure environment, the downward-pressing air passes through the nozzle 50 on the sealing plate 5 to form a high-pressure air needle, which directly penetrates into the upward-pressing pool water. Due to the high pressure and the large surface area of ​​the high-pressure air needle, the air and liquid are forced to merge, and the mixing effect is excellent. Thereafter, the air is discharged from the diffusion tube 6 on the side of the sleeve into the pool, and the gas-liquid fusion of the traditional process is further achieved in the diffusion tube. Among them, the flow direction of air, water, and gas-liquid mixture is shown by the arrows in Figure 1.

[0018] In this embodiment, the pitch of the upper spiral wing 31 is smaller than the pitch of the lower spiral wing 32; according to this solution, the downward air pressure can be significantly greater than the upward water pressure, so that the high-pressure gas can pass through the sealing plate 5 more smoothly to form a sharp air needle.

[0019] In addition, the sealing plate 5 and the main shaft 2 are fixed to each other; according to this scheme, the high-pressure gas needle can be made to rotate at high speed following the main shaft 2, so that the gas in a section of the gas needle can be distributed to the entire liquid surface below the sealing plate 5 during the rotation process, which fully guarantees the liquid's ability to dissolve the gas needle and significantly improves the gas-liquid fusion efficiency.

[0020] Example 2:

[0021] Figures 2 and 3 illustrate a second embodiment of the present invention. This embodiment differs from the first embodiment in that a barrier is also fixed to the main shaft 2. This barrier comprises shields 71 ​​evenly distributed around the circumference, equal in number to the number of diffusers 6. The outer surfaces of these shields 71 ​​are curved surfaces that conform to the inner wall of the sleeve 4. As the barrier rotates one revolution with the main shaft 2, each shield 71 blocks the connection 60 between each diffuser and the sleeve. Each connection 60 between the diffuser 6 and the sleeve 4 is always blocked and opened simultaneously. This design allows the pressure in the center of the sleeve 4 to rise sharply when all the connections 60 are blocked simultaneously, allowing the gas to dissolve easily into the water. Subsequently, the connection 60 opens, allowing the fully mixed gas-liquid mixture to be discharged through the diffuser 6.

[0022] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An aeration system for a sewage treatment pool, comprising a driving mechanism (1), wherein the driving mechanism (1) drives a main shaft (2) extending downward; the main shaft (2) is divided into an upper and lower section, and an upper spiral wing (31) and a lower spiral wing (32) extending along the main shaft are formed on the upper section and the lower section respectively, wherein the upper spiral wing (31) and the lower spiral wing (32) rotate in opposite clockwise directions; the main shaft (2) is further surrounded by a sleeve (4) coaxial with the main shaft, wherein an upper spiral channel is formed between the inner wall of the sleeve (4) and the upper spiral wing (31) and the upper spiral channel is connected to the main shaft A lower spiral channel is formed between the lower spiral wings (32); the sleeve (4) is relatively fixed to the housing of the driving mechanism (1), and the upper end of the sleeve (4) has an air inlet (40); a sealing plate (5) is provided inside the sleeve (4) between the upper spiral wings (31) and the lower spiral wings (32), and a spray hole (50) is opened on the sealing plate (5) along the axis of the main shaft; the sleeve (4) is laterally connected to more than two diffusion pipes (6) below the sealing plate (5), and the diffusion pipes (6) are evenly distributed around the main shaft (2); it is characterized by: A circuit breaker is also fixed on the main shaft (2), and the circuit breaker includes shielding plates (71) uniformly distributed in the circumferential direction and equal in number to the diffusers (6), and the outer side surface of the shielding plates (71) is an arc surface that fits the inner wall of the sleeve (4); when the circuit breaker rotates one circle following the main shaft (2), each shielding plate (71) blocks the connecting opening (60) between each diffuser (6) and the sleeve (4) once, and the connecting opening (60) between each diffuser (6) and the sleeve (4) is always blocked and opened at the same time.

2. The sewage treatment pool aeration system according to claim 1, characterized in that: The driving mechanism (1) comprises an electric motor or an internal combustion engine, and a speed-up gear set.

3. The sewage treatment pool aeration system according to claim 1, characterized in that: The pitch of the upper spiral wing (31) is smaller than the pitch of the lower spiral wing (32).

4. The sewage treatment pool aeration system according to claim 1, characterized in that: The sealing plate (5) and the main shaft (2) are fixed to each other.

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