Aeration and backflow equipment for sewage treatment

Abstract

The invention discloses aeration and backflow equipment for sewage treatment. The aeration and backflow equipment comprises a shell, an aeration mechanism and an annular drainage cover, the shell is provided with an aeration tank, and the aeration mechanism is mounted in the aeration tank and comprises an aeration pipe and an air blower; the air blower is connected with the air inlet and blows air to the air inlet. The annular drainage cover surrounds the periphery of the aeration pipe, a gas-liquid mixing cavity is formed between the annular drainage cover and the aeration pipe, and the gas spraying opening and the gas-liquid mixing cavity are sequentially communicated in the gas flowing direction. The top end of the drainage cover is provided with a mixed fluid outlet; the gas blocking ring surrounds the periphery of the gas spraying opening to block horizontal spraying of gas flow, a water supplementing gap is formed between the gas blocking ring and the aeration pipe, and the water supplementing gap, the gas-liquid mixing cavity and the mixed fluid outlet are sequentially communicated in the anti-gravity direction. In order to overcome the defects in the prior art, the aeration and reflux equipment for sewage treatment provided by the invention can improve the aeration efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to sewage treatment equipment technical field, especially to a kind of aeration and reflux equipment for sewage treatment. BACKGROUND

[0002] In the aeration process of sewage treatment, aeration is the core link: oxygen is transmitted to sewage to provide oxygen for the metabolism of aerobic microorganisms, and the airflow disturbance promotes the mixing of sewage and activated sludge. In current small and medium-sized sewage treatment facilities, diffused aeration equipment is widely used, which takes "aeration pipe + air blower" as the core, the air blower supplies air to the aeration pipe air supply cavity, and then the air bubble is discharged into the sewage through the air jet port. Some equipment is provided with a flow guide structure to assist the flow of air bubbles.

[0003] The existing diffused aeration equipment has the following problems: the gas-liquid mixing is not sufficient, there is no special mixing constraint space, the air bubbles rise quickly and stay for a short time, the contact area and time are limited, the aeration efficiency is low, the operation load is increased, there is no targeted water replenishment and reflux assistance, the flow guide structure only guides the air bubbles to rise and cannot block the horizontal airflow diffusion, the sewage near the aeration pipe is easy to be "vacuumed" to form a mixing imbalance, and an additional reflux pump is required, which increases the system complexity and cost. In summary, the existing equipment is insufficient in airflow control, gas-liquid mixing and function integration, the aeration efficiency is low, the energy consumption is high, and it is difficult to meet the high-efficiency and energy-saving needs of the industry, and the development and optimization of equipment are urgent problems to be solved. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the purpose of the present application is to provide a kind of aeration and reflux equipment for sewage treatment, which can improve the aeration efficiency.

[0005] The purpose of the present application is achieved by the following technical scheme:

[0006] A kind of aeration and reflux equipment for sewage treatment, including: shell, aeration mechanism and annular flow guide cover;The shell has aeration tank;The aeration mechanism is installed in the aeration tank, the aeration mechanism includes aeration pipe and air blower, the aeration pipe has sequentially communicated air inlet, air supply cavity and air jet port, air blower is connected with the air inlet, and is used to blow air to the air inlet;The annular flow guide cover is surrounded around the periphery of the aeration pipe, and forms a gas-liquid mixing cavity with the aeration pipe;The air jet port, the gas-liquid mixing cavity is sequentially communicated along the gas flow direction;The top end of the annular flow guide cover is provided with a mixed fluid outlet, the bottom end of the annular flow guide cover is a gas blocking ring, the gas blocking ring is surrounded around the periphery of the air jet port to block the airflow from being injected horizontally;The gas blocking ring and the aeration pipe form a water replenishment gap;The water replenishment gap, the gas-liquid mixing cavity and the mixed fluid outlet are sequentially communicated along the anti-gravity direction.

[0007] Further, the air jet port is provided with a plurality of air jet ports, and a plurality of air jet ports are distributed in a circumferential direction around the aeration pipe.

[0008] Further, the plurality of air injection ports are each provided with a one-way valve, and the flow direction of the one-way valve is from the gas conveying cavity to the gas-liquid mixing cavity.

[0009] Further, the aeration pipe is a ring-shaped aeration pipe.

[0010] Further, the aeration mechanism further comprises a water pumping pipe, a water pump and a jet port, the water pumping pipe is surrounded by the ring-shaped aeration pipe, the bottom of the aeration pipe is higher than the bottom of the water pumping pipe, and the water pumping pipe, the water pump and the jet port are sequentially connected along the water flow direction.

[0011] Further, the jet port is provided with a plurality of jet ports, and the plurality of jet ports are distributed along the axis of the water pumping pipe.

[0012] Further, the aeration mechanism further comprises a mounting rack, the mounting rack is mounted above the aeration tank, and the air blower and the water pump are both mounted on the mounting rack.

[0013] Further, the water pump is connected to the water pumping pipe through a water storage device, the water storage device has a water storage cavity, and the water pumping pipe is movably sleeved in the water storage cavity through a sealing ring; the air blower is movably sleeved in the aeration pipe through a gas storage device, the gas storage device has a gas storage cavity, and the air blower, the gas storage cavity and the air inlet are sequentially connected along the air flow direction.

[0014] Further, the aeration mechanism further comprises a driving device, the driving device is mounted on the mounting rack, the driving device comprises a driving motor, a driving pulley, a driven pulley and a transmission belt, the output part of the driving motor is connected to the driving pulley, the driven pulley is sleeved on the periphery of the water pumping pipe, the driving pulley and the driven pulley are transmission matched through the transmission belt, the aeration pipe is transmission connected with an agitator, and the agitator is located below the water pumping pipe.

[0015] Further, the periphery of the water pumping pipe is provided with an anti-blocking filter screen cover, the periphery of the anti-blocking filter screen cover is provided with a self-cleaning device, the self-cleaning device comprises a linear driving mechanism and a cleaning brush sleeve, the cleaning brush sleeve is movably sleeved on the periphery of the anti-blocking filter screen cover, and the linear driving mechanism.

[0016] Compared with the prior art, the beneficial effects of the present application are that:

[0017] 1. Based on the design that the annular draft tube is arranged around the periphery of the aeration pipe and forms a gas-liquid mixing cavity with the aeration pipe, compared with the prior art, the application actively blocks the horizontal jet path of the gas flow by the gas blocking ring, forcibly guides the gas into the gas-liquid mixing cavity in the anti-gravity direction, effectively avoids the waste caused by the premature escape of the gas, and the environment of the gas-liquid mixing cavity can further limit the diffusion range of the gas, thereby significantly improving the actual utilization rate of the gas in the aeration process and reducing the loss of invalid gas.

[0018] 2. Based on the design that the aeration pipe has a gas inlet, a gas conveying cavity and a gas jet in sequence, the air blower is connected with the gas inlet and is used for blowing gas to the gas inlet; the gas blocking ring is arranged around the periphery of the gas jet to block the horizontal jet of the gas flow; the gas blocking ring and the aeration pipe form a water replenishing gap; the water replenishing gap, the gas-liquid mixing cavity and the mixed fluid outlet are connected in sequence in the anti-gravity direction. With such a design, the gas flow drives the liquid to continuously flow from the gas-liquid mixing cavity to the mixed fluid outlet under the action of the buoyancy, thereby driving the liquid to continuously flow into the gas-liquid mixing cavity from the water replenishing gap to form a loop to actively replenish the sewage, so that the gas and the sewage meet and are forcibly mixed in the gas-liquid mixing cavity, thereby completely solving the problem of low mixing efficiency and slow response caused by the dependence on natural convection in the traditional aeration, and greatly improving the gas-liquid mixing speed and the mixing sufficiency.

[0019] 3. Based on the design that the gas jet, the gas-liquid mixing cavity are connected in sequence along the gas flow direction; and the water replenishing gap, the gas-liquid mixing cavity and the mixed fluid outlet are connected in sequence in the anti-gravity direction, compared with the prior art, the application has a gas-liquid mixing cavity specially used for gas-liquid mixing, which can prolong the contact time of the gas and the sewage, make the gas bubbles collide with the sewage in the cavity, and gradually be refined into smaller bubbles, thereby significantly increasing the gas-liquid contact area, allowing the oxygen to have more time to dissolve into the sewage, effectively improving the oxygen dissolution rate, and providing more sufficient oxygen for the subsequent sewage treatment process. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the sewage treatment aeration and reflux equipment of the application;

[0021] Figure 2 It is an enlarged view of A in Figure 1

[0022] Figure 3 It is an enlarged view of B in Figure 1

[0023] Figure 4 It is a cross-sectional structural schematic diagram of the application, wherein the direction indicated by the dashed line is the water flow direction;

[0024] Figure 5 It is​​Figure 4 Enlarged view at C, with the direction of water flow indicated by the dotted line;

[0025] Figure 6 As Figure 4 Enlarged view at D;

[0026] Figure 7 As Figure 1 Structure diagram of the aeration mechanism.

[0027] In the figure: 1, housing; 11, aeration tank; 2, aeration mechanism; 21, aeration pipe; 211, air inlet; 212, gas conveying cavity; 213, air jet; 214, one-way valve; 22, air blower; 23, water suction pipe; 24, water pump; 25, jet port; 26, mounting bracket; 27, driving device; 271, driving motor; 272, driving pulley; 273, driven pulley; 274, transmission belt; 3, annular flow guide cover; 31, mixed fluid outlet; 32, gas blocking ring; 33, water replenishment gap; 4, gas-liquid mixing cavity; 5, water storage device; 51, water storage cavity; 52, sealing ring; 6, gas storage device; 61, gas storage cavity; 7, agitator; 8, anti-blocking filter screen cover; 9, self-cleaning device; 91, linear driving mechanism; 92, cleaning brush sleeve. DETAILED DESCRIPTION

[0028] Hereinafter, the present application will be further described with reference to the drawings and specific embodiments, it should be noted that, in the absence of conflict, the following description of each embodiment or each technical feature can be arbitrarily combined to form a new embodiment.

[0029] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are used for illustrative purposes only and are not intended to be limiting.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0031] Reference should be made to Figures 1-7The sewage treatment aeration and reflux equipment of the preferred embodiment of the present application comprises a shell 1, an aeration mechanism 2 and a ring-shaped flow guide cover 3. The shell 1 has an aeration tank 11. The aeration mechanism 2 is installed in the aeration tank 11. The aeration mechanism 2 comprises an aeration pipe 21 and a blower 22. The aeration pipe 21 has an air inlet 211, a gas conveying cavity 212 and a gas jet 213 connected in sequence. The blower 22 is connected with the air inlet 211 and is used for blowing air into the air inlet 211. The ring-shaped flow guide cover 3 is arranged around the periphery of the aeration pipe 21 and forms a gas-liquid mixing cavity 4 with the aeration pipe 21. The gas jet 213, the gas-liquid mixing cavity 4 and the mixed fluid outlet 31 are connected in sequence along the gas flow direction. The top end of the ring-shaped flow guide cover 3 is provided with a mixed fluid outlet 31. The bottom end of the ring-shaped flow guide cover 3 is a gas blocking ring 32. The gas blocking ring 32 is arranged around the periphery of the gas jet 213 to block the gas flow from being jetted horizontally. The gas blocking ring 32 and the aeration pipe 21 form a water supplement gap 33. The water supplement gap 33, the gas-liquid mixing cavity 4 and the mixed fluid outlet 31 are connected in sequence along the anti-gravity direction.

[0032] The working principle of the present application is as follows: the liquid level of the sewage to be treated in the aeration tank 11 covers the ring-shaped draft hood 3 (ensuring that the water replenishment gap 33 can be in communication with the sewage); the air blower 22 is started, and the compressed air generated by the air blower 22 is delivered to the air inlet 211 of the aeration pipe 21 through the pipeline; the compressed air flows along the gas conveying cavity 212 inside the aeration pipe 21, and is finally sprayed out from the air outlet 213 of the aeration pipe 21; since the bottom end of the ring-shaped draft hood 3 is provided with the air baffle ring 32, and the air baffle ring 32 is arranged around the periphery of the air outlet 213, the compressed air sprayed out from the air outlet 213 is blocked by the air baffle ring 32 and cannot spread horizontally, and is forced to enter the gas-liquid mixing cavity 4 between the aeration pipe 21 and the ring-shaped draft hood 3 in the "anti-gravity direction" (i.e. upward); as the compressed air enters the gas-liquid mixing cavity 4 upward, a local negative pressure is formed in the gas-liquid mixing cavity 4, and the sewage to be treated in the aeration tank 11 is sucked into the gas-liquid mixing cavity 4 through the water replenishment gap 33 between the air baffle ring 32 and the aeration pipe 21, realizing the synergistic effect of "gas upward guidance + synchronous water replenishment". The compressed air entering the gas-liquid mixing cavity 4 and the replenished sewage fully contact, collide and stir in the cavity, forming a gas-liquid mixed fluid, the bubbles are cut into smaller sizes, the gas-liquid contact area is increased, and the aeration efficiency is improved; the closed structure of the gas-liquid mixing cavity 4 further strengthens the gas-liquid disturbance effect, avoids the direct upward floating and dispersion of the bubbles, and ensures that the oxygen can be more fully dissolved into the sewage; the gas-liquid mixed fluid continuously generated in the gas-liquid mixing cavity 4 continuously rises in the anti-gravity direction under the action of the subsequent compressed air and its own buoyancy, and is finally discharged from the mixed fluid outlet 31 at the top end of the ring-shaped draft hood 3; the discharged gas-liquid mixed fluid reenters the main body of the sewage in the aeration tank 11, on the one hand, it transfers the dissolved oxygen to the microorganisms in the sewage (for degrading pollutants), and on the other hand, it drives the local circulation of the sewage in the aeration tank 11, further improves the overall sewage treatment effect, and completes one aeration cycle.

[0033] Obviously, based on the design that the annular draft tube 3 is arranged around the periphery of the aeration pipe 21 and forms the gas-liquid mixing cavity 4 with the aeration pipe 21, compared with the prior art, the application actively blocks the horizontal jet path of the airflow by the air blocking ring 32, forcibly guides the gas into the gas-liquid mixing cavity 4 in the anti-gravity direction, effectively avoids the waste caused by the premature escape of the gas, and the closed environment of the gas-liquid mixing cavity 4 can further limit the diffusion range of the gas, significantly improve the actual utilization rate of the gas in the aeration process, and reduce the effect of invalid gas loss. Based on the aeration pipe 21 having the air inlet 211, the gas conveying cavity 212 and the air jet port 213 connected in sequence, the air blower 22 is connected with the air inlet 211 and used for blowing air to the air inlet 211; the air blocking ring 32 is arranged around the periphery of the air jet port 213 to block the horizontal jet of the airflow; the air blocking ring 32 and the aeration pipe 21 form the water replenishing gap 33; the water replenishing gap 33, the gas-liquid mixing cavity 4 and the mixed fluid outlet 31 are connected in sequence in the anti-gravity direction. Such a design, the airflow drives the liquid to continuously flow from the gas-liquid mixing cavity 4 to the mixed fluid outlet 31, thereby driving the liquid to continuously flow from the water replenishing gap 33 into the gas-liquid mixing cavity 4 to form a loop to actively replenish the sewage, so that the gas and the sewage meet and are forcibly mixed in the gas-liquid mixing cavity 4, completely solve the problem of low mixing efficiency and slow response caused by the dependence on natural convection in the traditional aeration, and greatly improve the effects of gas-liquid mixing speed and mixing sufficiency. Based on the design that the air jet port 213 and the gas-liquid mixing cavity 4 are connected in sequence along the gas flow direction; the water replenishing gap 33, the gas-liquid mixing cavity 4 and the mixed fluid outlet 31 are connected in sequence in the anti-gravity direction, compared with the prior art, the application has the gas-liquid mixing cavity 4 specially used for gas-liquid mixing, which can prolong the contact time of the gas and the sewage, make the bubbles continuously collide and cut the sewage in the cavity, gradually be refined into smaller bubbles, and then significantly increase the gas-liquid contact area, so that the oxygen has more time to dissolve into the sewage, effectively improve the oxygen dissolution rate, and provide more sufficient oxygen for the subsequent sewage treatment process.

[0034] Referring to Figure 5, preferably, in the embodiment, the air injection ports 213 are provided in plurality, and the plurality of air injection ports 213 are circumferentially spaced apart around the aeration pipe 21. In this way, the plurality of circumferentially spaced air injection ports 213 can make the compressed air delivered by the air blower 22 be uniformly injected along the circumferential direction of the aeration pipe 21, so that a circumferentially uniform gas flow field is formed before the gas enters the gas-liquid mixing chamber 4, avoiding the imbalance of "local gas excess and local gas deficiency" in the gas-liquid mixing chamber 4. The uniformly distributed air injection ports 213 can make the upwardly directed gas flow form a circumferentially symmetrical upward driving force in the gas-liquid mixing chamber 4, driving the sewage in the cavity of the gas-liquid mixing chamber 4 to form a circumferentially circulating flow, so that the sewage sucked from the four sides by the water replenishment gap 33 can be precisely contacted with the gas flow, avoiding the problem of "one-sided gas-liquid mixing sufficient and one-sided mixing lag" caused by a single air injection port 213, and greatly improving the overall uniformity of gas-liquid mixing. The uniformly distributed air injection ports 213 can split the gas into multiple small gas flows, and form multiple-point collision and stirring with the sewage in the gas-liquid mixing chamber 4, so as to promote the bubbles to be more fully cut and refined, effectively increasing the gas-liquid contact area; at the same time, the multiple gas flows can also reduce the agglomeration of bubbles, so that oxygen can be more efficiently dissolved into the sewage, further strengthening the aeration efficiency.

[0035] Preferably, in the embodiment, the air injection ports 213 are provided in plurality, and the plurality of air injection ports 213 are circumferentially spaced apart around the aeration pipe 21. In this way, the plurality of circumferentially spaced air injection ports 213 can make the compressed air delivered by the air blower 22 be uniformly injected along the circumferential direction of the aeration pipe 21, so that a circumferentially uniform gas flow field is formed before the gas enters the gas-liquid mixing chamber 4, avoiding the imbalance of "local gas excess and local gas deficiency" in the gas-liquid mixing chamber 4. The uniformly distributed air injection ports 213 can make the upwardly directed gas flow form a circumferentially symmetrical upward driving force in the gas-liquid mixing chamber 4, driving the sewage in the cavity of the gas-liquid mixing chamber 4 to form a circumferentially circulating flow, so that the sewage sucked from the four sides by the water replenishment gap 33 can be precisely contacted with the gas flow, avoiding the problem of "one-sided gas-liquid mixing sufficient and one-sided mixing lag" caused by a single air injection port 213, and greatly improving the overall uniformity of gas-liquid mixing. The uniformly distributed air injection ports 213 can split the gas into multiple small gas flows, and form multiple-point collision and stirring with the sewage in the gas-liquid mixing chamber 4, so as to promote the bubbles to be more fully cut and refined, effectively increasing the gas-liquid contact area; at the same time, the multiple gas flows can also reduce the agglomeration of bubbles, so that oxygen can be more efficiently dissolved into the sewage, further strengthening the aeration efficiency.

[0036] Referring to Figure 2 and Figure 7, preferably, in the embodiment, the aeration mechanism 2 further comprises a water suction pipe 23, a water pump 24 and a jet port 25, the water suction pipe 23 is surrounded by the annular aeration pipe, the bottom of the aeration pipe 21 is higher than the bottom of the water suction pipe 23, and the water suction pipe 23, the water pump 24 and the jet port 25 are sequentially communicated along the water flow direction. In this way, the water suction pipe 23 is arranged in the aeration pipe 21 and has a lower bottom, so that the deep water in the aeration tank 11 which is prone to deposition and oxygen deficiency at the bottom can be directly sucked. In the traditional aeration, the airflow only acts on the upper water body, resulting in the formation of a "static dead zone" at the bottom, enrichment of pollutants and lack of oxygen. However, the design can accurately treat the deep water and break the limitation of water stratification. At the same time, the arrangement can drive the up-and-down circulation of the sewage in the aeration tank 11, reduce the dead zone at the bottom, make the oxygen more uniformly diffuse to the whole tank, thereby improving the overall aeration efficiency and ensuring the effect of sewage treatment.

[0037] Referring to Figure 2 , preferably, in the embodiment, the jet port 25 is provided with a plurality of jet ports 25 which are distributed around the axis of the water suction pipe 23. In this way, compared with a single jet port 25 which is prone to cause the problem of concentrated water flow in a local area and lack of water flow in other areas, the plurality of jet ports 25 distributed around the axis can uniformly spray the deep water delivered by the water pump 24 along the circumferential direction of the water suction pipe 23, forming a circumferentially symmetrical water flow field. In this way, multiple water flows can be formed, and the multidirectional disturbance formed by the multiple water flows can further cut the bubbles, intensify the fluid turbulence, increase the gas-liquid contact area, and simultaneously drive the water body in the aeration tank 11 to form a more uniform circulation flow field, avoiding local oxygen deficiency and ensuring stable aeration efficiency.

[0038] Referring to Figure 1 and Figure 4 , preferably, in the embodiment, the aeration mechanism 2 further comprises a mounting frame 26, the mounting frame 26 is installed above the aeration tank 11, and the air blower 22 and the water pump 24 are both installed on the mounting frame 26. The mounting frame 26 is fixed above the aeration tank 11, which can provide stable support for the air blower 22 and the water pump 24, avoid the equipment displacement or pipeline loosening caused by sewage soaking and tank vibration in the traditional floor installation, ensure that the airflow delivered by the air blower 22 to the aeration pipe 21 and the water flow delivered by the water pump 24 to the water suction pipe 23 always remain stable, and eliminate the pressure fluctuation caused by equipment shaking or water pressure fluctuation, thereby providing a continuous and balanced power source for the gas-liquid mixing chamber 4.

[0039] Referring to Figure 2 and Figure 6, preferably, in the embodiment, the water pump 24 is connected to the water suction pipe 23 through the water storage device 5, the water storage device 5 has a water storage cavity 51, and the water suction pipe 23 is movably sleeved in the water storage cavity 51 through a sealing ring 52; the air blower 22 is movably sleeved in the aeration pipe 21 through the air storage device 6, the air storage device 6 has an air storage cavity 61 inside, and the air blower 22, the air storage cavity 61 and the air inlet 211 are sequentially connected in the air flow direction. In this way, the water storage cavity 51 of the water storage device 5 can buffer the water flow delivered by the water pump 24, eliminate the water flow pressure fluctuation caused by the operation pulse of the water pump 24, make the sewage flow and pressure entering the water conveying cavity more balanced, and ensure that the multiple jetting ports 25 can continuously spray stable water flow. The water pipe is movably sleeved in the water storage cavity 51 through the sealing ring 52, which can realize dynamic sealing through the sealing ring 52 to prevent pressure loss caused by sewage leakage, allow the water suction pipe 23 to produce slight displacement with the vibration of the equipment, avoid pipeline damage caused by rigid connection due to vibration, and ensure the continuity of sewage delivery. The air storage cavity 61 of the air storage device 6 can store the compressed air output by the air blower 22, buffer the air flow pressure fluctuation, make the gas pressure entering the air inlet 211 of the aeration pipe 21 more stable, ensure that the air flow sprayed by the multiple air injection ports 213 is uniform and has consistent intensity, and avoid the problem that the bubble size is large and small and the gas-liquid contact area is unstable due to sudden change of air pressure. The movably sleeved design of the air blower 22 and the aeration pipe 21 can also adapt to the vibration during equipment operation, cooperate with the sealing structure of the air storage cavity 61, prevent power loss caused by gas leakage, and ensure that the gas-liquid mixing cavity 4 obtains continuous and stable gas input.

[0040] Referring to Figure 2, preferably, in this embodiment, the aeration mechanism 2 further comprises a driving device 27 mounted on the mounting frame 26, the driving device 27 comprising a driving motor 271, a driving pulley 272, a driven pulley 273 and a transmission belt 274, the output of the driving motor 271 being connected to the driving pulley 272, the driven pulley 273 being sleeved on the periphery of the water suction pipe 23, the driving pulley 272 and the driven pulley 273 being transmission matched through the transmission belt 274, the aeration pipe 21 being transmission connected with a stirrer 7, and the stirrer 7 being located below the water suction pipe 23. The driving motor 271 drives the driven pulley 273 to rotate through the belt transmission, and then drives the water suction pipe 23 to rotate. The rotating water suction pipe 23 makes the water flow sprayed from the multiple jet ports 25 form a circumferential rotating jet, which collides more violently with the liquid surface than the static sprayed water flow, can form more bubbles and greatly increases the gas-liquid contact area. The stirrer 7 is located below the water suction pipe 23 and can directly act on the bottom of the aeration tank 11, which is the area where pollutants are easy to deposit and oxygen is scarce. In traditional aeration, the bottom sewage often forms a "deposition dead zone" due to poor flowability, and it is difficult for pollutants to contact and degrade with oxygen. However, the stirrer 7 can actively stir the bottom sewage, disperse the deposited particulate matter, and make it move upward with the water flow, thereby avoiding the enrichment of pollutants and affecting the treatment effect, and at the same time, making the bottom sewage become a "fresh water source" to be treated, thereby improving the treatability of the overall sewage.

[0041] Preferably, in this embodiment, the periphery of the water suction pipe 23 is provided with a anti-blocking filter cover 8, the periphery of the anti-blocking filter cover 8 is provided with a self-cleaning device 9, the self-cleaning device 9 comprises a linear drive mechanism 91 and a cleaning brush sleeve 92, the cleaning brush sleeve 92 is movably sleeved on the periphery of the anti-blocking filter cover 8, the linear drive mechanism 91 is mounted on the bottom of the annular drainage cover 3, the output of the linear drive mechanism 91 is connected to the cleaning brush sleeve 92, and the anti-blocking filter cover 8 is located above the stirrer 7. The anti-blocking filter cover 8 on the periphery of the water suction pipe 23 can intercept suspended impurities, flocculation or small particles in the sewage. The stirrer 7 is located below the filter cover, and its stirring can make the bottom deposited impurities move upward with the water flow. The filter cover can accurately filter these impurities to prevent them from entering the water suction pipe 23 and blocking the pipeline or wearing out the water pump 24, thereby ensuring that the water suction pipe 23 always maintains a stable sewage suction amount. The self-cleaning device 9 solves the problem that the filter cover is easily blocked by impurities. The linear drive mechanism 91 drives the cleaning brush sleeve 92 to reciprocate along the periphery of the filter cover, which can remove the attached impurities in real time and prevent the filter screen pores from being blocked, thereby preventing the water inlet resistance from increasing and the water suction amount from decreasing. This design can maintain the continuous and efficient filtering capacity of the filter screen, ensure the stability of the water inlet pressure of the water suction pipe 23, make the water flow sprayed from the jet ports 25 uniform, and ensure the oxygen dissolution efficiency.

[0042] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. Also, the specific features, structures, materials or characteristics described can be combined in an appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0043] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0044] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of various changes or replacements within the technical range disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An aeration and recirculation device for wastewater treatment, characterized in that, include: The shell (1) has an aeration tank (11). An aeration mechanism (2) is installed in the aeration tank (11). The aeration mechanism (2) includes an aeration pipe (21) and a blower (22). The aeration pipe (21) has an air inlet (211), an air delivery chamber (212), and an air jet (213) connected in sequence. The blower (22) is connected to the air inlet (211) and is used to blow air into the air inlet (211). An annular flow guide (3) surrounds the aeration pipe (21) and forms a gas-liquid mixing chamber (4) with the aeration pipe (21); the jet nozzle (213) and the gas-liquid mixing chamber (4) are connected in sequence along the gas flow direction; the top of the annular flow guide (3) is provided with a mixed fluid outlet (31), and the bottom of the annular flow guide (3) is a baffle ring (32), which surrounds the jet nozzle (213) to block the airflow from being sprayed horizontally; a water replenishment gap (33) is formed between the baffle ring (32) and the aeration pipe (21); the water replenishment gap (33), the gas-liquid mixing chamber (4) and the mixed fluid outlet (31) are connected in sequence along the anti-gravity direction.

2. The aeration and recirculation equipment for wastewater treatment according to claim 1, characterized in that, The jet nozzles (213) are provided in multiple ways, and the multiple jet nozzles (213) are distributed circumferentially around the aeration pipe (21).

3. The aeration and recirculation equipment for wastewater treatment according to claim 2, characterized in that, Each of the multiple jet nozzles (213) is equipped with a one-way valve (214), and the flow direction of the one-way valve (214) is from the gas delivery chamber (212) to the gas-liquid mixing chamber (4).

4. The aeration and recirculation equipment for wastewater treatment according to claim 1, characterized in that, The aeration pipe (21) is an annular aeration pipe.

5. The aeration and recirculation equipment for wastewater treatment according to claim 4, characterized in that, The aeration mechanism (2) also includes a water pump (23), a water pump (24), and a spray nozzle (25). The water pump (23) is surrounded by the annular aeration pipe. The bottom of the aeration pipe (21) is higher than the bottom of the water pump (23). The water pump (23), the water pump (24), and the spray nozzle (25) are connected in sequence along the water flow direction.

6. The aeration and recirculation equipment for wastewater treatment according to claim 5, characterized in that, The spray nozzle (25) is provided in multiple locations, and the multiple spray nozzles (25) are distributed at intervals around the axis of the pumping pipe (23).

7. The aeration and recirculation equipment for wastewater treatment according to claim 5, characterized in that, The aeration mechanism (2) also includes a mounting frame (26), which is installed above the aeration tank (11). The blower (22) and the water pump (24) are both installed on the mounting frame (26).

8. The aeration and recirculation equipment for wastewater treatment according to claim 7, characterized in that, The water pump (24) is connected to the pumping pipe (23) through the water storage device (5). The water storage device (5) has a water storage chamber (51). The pumping pipe (23) is movably sleeved in the water storage chamber (51) through the sealing ring (52). The blower (22) is movably sleeved in the aeration pipe (21) through the air storage device (6). The air storage device (6) has an air storage chamber (61) inside. The blower (22), the air storage chamber (61), and the air inlet (211) are connected in sequence along the airflow direction.

9. The aeration and recirculation equipment for wastewater treatment according to claim 8, characterized in that, The aeration mechanism (2) further includes a drive device (27), which is mounted on the mounting frame (26). The drive device (27) includes a drive motor (271), a drive pulley (272), a driven pulley (273), and a transmission belt (274). The output of the drive motor (271) is connected to the drive pulley (272). The driven pulley (273) is sleeved around the water pumping pipe (23). The drive pulley (272) and the driven pulley (273) are driven together by the transmission belt (274). The aeration pipe (21) is connected to a stirrer (7), and the stirrer (7) is located below the water pumping pipe (23).

10. An aeration and recirculation device for wastewater treatment according to claim 9, characterized in that, The water pump (23) is provided with an anti-clogging filter screen (8) around its periphery. The anti-clogging filter screen (8) is provided with a self-cleaning device (9) around its periphery. The self-cleaning device (9) includes a linear drive mechanism (91) and a cleaning brush sleeve (92). The cleaning brush sleeve (92) is movably fitted around the anti-clogging filter screen (8). The linear drive mechanism (91) is installed at the bottom of the annular drain cover (3). The output part of the linear drive mechanism (91) is connected to the cleaning brush sleeve (92). The anti-clogging filter screen (8) is located above the agitator (7).

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