Anti-backflow aerator for sewage treatment

Abstract

The utility model discloses an anti-backflow aerator for sewage treatment. The anti-backflow aerator comprises a base, an air bag, an aeration membrane, a fixing ring and a pressing plate, a pressing cover is installed on the base, an air bag and an aeration membrane are arranged between the base and the pressing cover, an air cavity is defined by the air bag and the aeration membrane, a plurality of micropores for discharging air in the air cavity are formed in the aeration membrane, the pressing cover is used for clamping and fixing the air bag and the aeration membrane in the base, and an air inlet pipe communicated with the air cavity is arranged on the base. The air inlet is used for being connected with an external air supply pipe and inputting compressed air into the air cavity. According to the utility model, the aeration membrane deforms along with the change of the pressure in the air cavity, so that the aperture of the micropores is opened and closed along with the deformation of the aeration membrane, and air can be discharged from the micropores to oxygenate water; and the pressure balance inside and outside the aeration membrane is kept through the deformation of the air bag, so that the micropores have a self-closing function, thereby preventing sewage backflow, avoiding sludge blockage and realizing long-time intermittent aeration.

Description

Technical Field

[0001] This utility model relates to the technical field of sewage treatment equipment, and in particular to an anti-backflow aerator for sewage treatment. Background Technology

[0002] Rubber aerators, as a core component in wastewater treatment, oxygenate water by diffusing gas. However, they have some drawbacks in practical applications. First, backflow of wastewater: During intermittent aeration, the diaphragm may not close tightly when aeration stops, allowing wastewater to flow back into the aeration pipeline, causing blockages or equipment corrosion. Second, short lifespan: Traditional rubber diaphragms are prone to aging and hardening due to long-term exposure to gas impact and wastewater corrosion, leading to frequent breakage or tearing and requiring frequent replacement, resulting in high maintenance costs. Utility Model Content

[0003] The purpose of this invention is to provide an anti-backflow aerator for sewage treatment, addressing the aforementioned problems and solving the issues of short intermittent aeration time and sewage backflow in the prior art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A backflow prevention aerator for wastewater treatment specifically includes a base, an air bladder, an aeration membrane, a fixing ring, and a pressure plate. The base includes a chassis, a chassis wall, and a chassis wall flange. A pressure cap is installed on the base. A pressure cap flange is integrally formed along the axial direction at the outer edge of the pressure cap. A mating thread is provided between the pressure cap flange and the chassis wall flange. An air bladder and an aeration membrane are provided between the base and the pressure cap. The air bladder and the aeration membrane enclose an air chamber. The aeration membrane has multiple micropores for the gas to be discharged from the air chamber. The pressure cap is used to clamp and fix the air bladder and the aeration membrane in the base. An air inlet pipe communicating with the air chamber is provided on the base. It is used to connect to an external air supply pipe and input compressed air into the air chamber. The end faces of the chassis wall flange and the pressure cap flange are respectively provided with a first arc-shaped groove and a second arc-shaped groove. The first arc-shaped groove and the second arc-shaped groove are both annular grooves and cooperate with each other to form a circular groove structure. A fixing ring is sandwiched between the air bladder and the aeration membrane. The fixing ring is placed in the circular groove structure and bends the air bladder and the aeration membrane radially, further ensuring the air chamber's sealing performance. The aeration membrane deforms with the pressure inside the air chamber, and the pore size of the multiple micropores changes with the deformation of the aeration membrane, thereby opening and closing the multiple micropores, allowing gas to be discharged through the micropores, and maintaining the pressure inside the air chamber through the deformation of the air bladder.

[0006] Preferably, the inner channel of the intake pipe is provided with at least one variable diameter section along the gas flow direction, and the radial cross section of the variable diameter section is continuously varied, which is used to guide the gas flow.

[0007] Preferably, the air bladder is made of an elastic material, and the aeration membrane is made of TPU material. Using TPU material to make the aeration membrane can significantly improve the tear resistance of the aeration membrane and extend the service life of the aerator.

[0008] As an option, the base includes a chassis, a chassis wall, a chassis wall flange, and an air intake pipe. The chassis is specifically disc-shaped. The chassis wall extends integrally upward along the axial direction at the edge of the chassis, and the chassis wall forms a groove structure with the chassis. The chassis wall flange extends integrally outward along the radial direction at the edge of the chassis wall. The air intake pipe is integrally formed downward along the axial direction at the center of the chassis, and the outer peripheral wall of the air intake pipe is provided with a third thread for threaded connection with an external air supply pipe.

[0009] Preferably, the chassis is provided with a plurality of lightweight holes arranged in a circumferential array, and the plurality of lightweight holes are distributed along the circumferential array of the chassis, so as to reduce the overall mass while maintaining the structural strength.

[0010] As an option, the airbag includes an airbag disc with an arcuate concave surface, an airbag flange, and an airbag connecting tube. The airbag flange is integrally provided radially outward at the edge of the airbag disc, and the airbag connecting tube is provided axially downward at the center of the airbag disc. The airbag discs are stacked in the groove structure, and the airbag flange overlaps with the chassis wall flange, and the airbag connecting tube is coaxially inserted into the air intake pipe.

[0011] Preferably, the outer peripheral wall of the airbag connecting pipe is provided with a first thread, and the inner peripheral wall of the air inlet pipe is provided with a second thread that mates with the first thread. The airbag is installed in the base through the threaded engagement, which is convenient, stable and reliable. Furthermore, compressed air will not flow through the gap between the airbag and the base, thus preventing the compressed air from entering the air chamber.

[0012] As an option, the aeration membrane is a circular sheet structure, which includes an aeration membrane sheet and an aeration membrane edge from the inside out. The multiple micropores are arranged in the aeration membrane sheet. The aeration membrane edge overlaps with the airbag flange. The pressure cap is a ring-shaped sheet structure. The pressure cap is stacked on top of the aeration membrane edge and connected to the chassis wall flange, such as by thread or welding, so that the pressure cap and the chassis wall flange cooperate to clamp the airbag flange and the aeration membrane edge, ensuring the air chamber is sealed. The fixing ring is clamped between the aeration membrane edge and the airbag flange.

[0013] Preferably, the micropores have a diameter of 1-3 mm, and multiple micropores are arranged in a ring-like spacing to form multiple concentric ring structures. The micropores within the same ring have the same diameter, while the micropores between the spacer rings can have the same or different diameters. By setting micropores of different diameters on the aeration membrane, the bubble distribution is made more uniform, significantly improving oxygen utilization and further optimizing wastewater treatment efficiency.

[0014] By adopting the above technical solution, this utility model has the following beneficial effects:

[0015] This invention introduces compressed air into the air chamber, causing the aeration membrane to deform under the pressure within the chamber. The pores of the multiple micropores on the aeration membrane expand as the membrane deforms, allowing gas to escape through the micropores and oxygenate the water. Simultaneously, when the compressed air supply stops, the deformation of the air bladder maintains pressure balance inside and outside the aeration membrane. The multiple micropores on the aeration membrane recover as the membrane returns to its original shape, giving the micropores a self-closing function. This prevents sewage from flowing back into the aerator and piping system, avoids sludge blockage, and enables long-term intermittent aeration. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is the utility model Figure 1 A cross-sectional view.

[0018] Figure 3 This is a schematic diagram of the base structure of this utility model.

[0019] Figure 4 This is a schematic diagram of the airbag structure of this utility model.

[0020] Figure 5 This is a schematic diagram of the aeration membrane structure of this utility model.

[0021] Figure 6 This is a schematic diagram of the capping part of this utility model.

[0022] In the attached diagram, there is a base 1, a chassis 11, a chassis wall 12, a chassis wall flange 13, a lightweight hole 14, an air intake pipe 15, a second thread 16, a third thread 17, and a first arc groove 18.

[0023] Airbag 2, airbag disc 21, airbag flange 22, airbag connecting tube 23, first thread 24;

[0024] Aeration membrane 3, micropores 31, aeration membrane sheet 32, aeration membrane edge 33;

[0025] Pressure cap 4, second arc groove 43;

[0026] 5. Fixing ring. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0028] See Figures 1-6This embodiment of a wastewater treatment anti-backflow aerator includes, from bottom to top, a base 1, an air bladder 2, an aeration membrane 3, a pressure cap 4, and a fixing ring 5. The air bladder 2 and the aeration membrane 3 enclose an air chamber. The aeration membrane 3 has multiple micropores 31 for venting gas from the air chamber. The pressure cap 4 clamps and fixes the air bladder 2 and the aeration membrane 3. Specifically, the air bladder 2 is made of an elastic material, and the aeration membrane 3 is made of TPU material, making the aeration membrane 3 less prone to tearing and greatly extending the aerator's service life. The aeration membrane 3 deforms with the pressure inside the air chamber, and the pore size of the multiple micropores 31 changes with the deformation of the aeration membrane 3, thereby opening and closing the multiple micropores 31. During air supply, small bubbles emerge from the micropores 31, which play a role in stirring and oxygenating the wastewater. Further explanation follows:

[0029] See Figures 1-3 The base 1 includes an integrally formed chassis 11, chassis wall 12, chassis wall flange 13, and air intake pipe 15. The chassis 11 is specifically disc-shaped, with four lightweight holes 14 arranged in a circumferential array on the chassis 11, which reduces the overall weight of the base 1 while maintaining structural strength. The chassis wall 12 is axially upward at the edge of the chassis 11, forming a groove structure with the chassis 11. The chassis wall flange 13 is radially outward at the edge of the chassis wall 12, and the air intake pipe 15 is axially downward at the center of the chassis 11.

[0030] See Figure 2 and Figure 4The airbag 2 includes an airbag disc 21 with an arc-shaped concave surface. An airbag flange 22 is integrally provided on the edge of the airbag disc 21 extending radially outward. A through hole is opened at the center of the airbag disc 21, and an airbag connecting tube 23 is integrally formed or welded below the through hole. The airbag disc 21 is stacked in the groove structure, and the airbag flange 22 is stacked with the chassis wall flange 13. The airbag connecting tube 23 is coaxially inserted into the air intake pipe 15. The air intake pipe 15 and the airbag connecting tube 23 are connected to the air chamber in sequence. Specifically, the outer peripheral wall of the airbag connecting pipe 23 is provided with a first thread 24, and the inner peripheral wall of the air intake pipe 15 is provided with a second thread 16 that mates with the first thread 24. That is, the airbag 2 is installed in the base 1 via threaded connection, making assembly convenient and secure. It should be noted that in other alternative embodiments, the airbag connecting pipe 23 and the air intake pipe 15 can also be fixed relative to each other by bonding, welding, or interference fit; that is, the installation method is not limited, ensuring that compressed air does not flow between the airbag and the base and create gaps. Simultaneously, the inner channel of the air intake pipe 15 has a variable diameter section along the gas flow direction, with a continuously changing radial cross-section; that is, the two ends of the inner channel of the air intake pipe 15 are cylindrical, and the middle section is funnel-shaped. The outer peripheral wall of the air intake pipe 15 is provided with a third thread 17, allowing it to be threadedly connected to an external air supply pipe. In other alternative embodiments, if the outer peripheral wall of the air intake pipe 15 does not have a third thread 17, it can be connected to the external air supply pipe by bonding or welding. Compressed air is supplied to the air chamber through an external air supply pipe. The compressed air enters the air chamber through the air inlet pipe 15 and the air bladder connecting pipe 23. The compressed air pressure is further increased when passing through the variable diameter section, which makes the gas flow speed faster.

[0031] See Figure 3 The aeration membrane 3 has a circular sheet structure, which includes an aeration membrane sheet 32 ​​and an aeration membrane edge 33 from the inside out. Multiple micropores 31 are arranged in the aeration membrane sheet 32. Specifically, the pore diameter of the micropores is 1-3 mm. The micropores are arranged in a ring-like interval, forming multiple concentric ring structures. The micropores within the same ring have the same pore diameter, while the pore diameters between the spacer rings can be the same or different. The aeration membrane edge 33 is overlapped and fixed to the airbag flange 22, such as by welding or bonding. A fixing ring 5 is sandwiched between the two. The fixing ring 5 can be pre-placed in the middle during the welding of the airbag 2 and the aeration membrane sheet 3, fixing it in the middle of the weld seam between the airbag and the aeration membrane sheet.

[0032] See Figure 2 and Figure 6The pressure cap 4 has a ring-shaped structure. It is stacked on top of the aeration membrane edge 33 and connected to the base wall flange 13. It can be installed by threaded connection or welding, and the installation method is not limited. In this embodiment, welding is used for connection. If threaded connection is used, the pressure cap flange is integrally formed along the axial direction at the outer edge of the pressure cap 4, and a mating thread is provided between the pressure cap flange and the base wall flange. At the same time, the end faces of the base wall flange 13 and the pressure cap flange 42 are respectively provided with a first arc groove 18 and a second arc groove 43. The first arc groove 18 and the second arc groove 43 are both annular grooves and cooperate with each other to form an annular groove structure. The aeration membrane edge 33 and the air bag flange 22 are clamped with a fixing ring 5 and placed in the annular groove structure. After the pressure cap 4 is fixed to the base 1, it simultaneously presses the edges of the air bag 2 and the aeration membrane 3 to form a sealed air cavity. The fixing ring 5 further ensures the air cavity's sealing performance.

[0033] The working principle of this utility model:

[0034] When the aerator is placed in the sewage tank, compressed air is supplied through the external air supply pipe and then into the air chamber through the air inlet pipe 15. The aeration membrane 3 deforms and rises under the pressure of the gas. The pore size of the micropores 31 expands and increases with the deformation of the aeration membrane 3, allowing compressed air to enter the water through multiple micropores 31 and oxygenate the tank. The bubbles are cut and reduced in size by the micropores 31, and the diameter of the bubbles can be finely adjusted according to the amount of air flow, thus achieving a better oxygenation effect. The design of the fixing ring 5 ensures the airtightness of the air chamber and effectively prevents air leakage.

[0035] When compressed air is stopped, the pressure inside the air chamber decreases, the aeration membrane 3 returns to its original shape, and the pore size of the micropores 31 returns to its original size as the aeration membrane 3 recovers. The air bladder 2 deforms due to the pressure change, thereby regulating the gas pressure inside the air chamber. This ensures that the pressure inside and outside the micropores 31 of the aeration membrane 3 remains balanced, preventing water from entering the air chamber through the micropores 31 and preventing sewage from flowing back into the air bladder (or air supply pipe). It also prevents sludge from clogging the micropores 31 and can achieve a self-closing check function after a long period of aeration stoppage. It can still aerate normally when compressed air is introduced again.

[0036] This invention has been tested and found that it can still aerate normally when compressed air is introduced again after aeration has stopped for more than 72 hours, and there is no backflow of sewage. It has a simple structure and reduces maintenance costs.

[0037] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A backflow prevention aerator for sewage treatment, comprising a base (1), the base (1) comprising a chassis (11), a chassis wall (12) and a chassis wall flange (13), a pressure cap (4) mounted on the base (1), a pressure cap flange integrally formed along the axial direction at the outer edge of the pressure cap (4), and a mating thread provided between the pressure cap flange and the chassis wall flange (13); an air bladder (2) and an aeration membrane (3) are provided between the base (1) and the pressure cap (4), the air bladder (2) and the aeration membrane (3) forming an air chamber, the aeration membrane (3) having multiple micropores (31) for supplying gas from the air chamber, the pressure cap (4) for clamping and fixing the air bladder (2) and the aeration membrane (3), and an air inlet pipe (15) communicating with the air chamber on the base (1), which is used to connect an external air supply pipe and input compressed air into the air chamber, characterized in that: The end faces of the chassis wall flange (13) and the pressure cover flange are respectively provided with a first arc groove (18) and a second arc groove (43). The first arc groove (18) and the second arc groove (43) are both annular grooves and cooperate with each other to form a circular groove structure. A fixing ring (5) is sandwiched between the air bag (2) and the aeration membrane (3). The fixing ring (5) is placed in the circular groove structure.

2. The anti-backflow aerator for wastewater treatment according to claim 1, characterized in that: The base (1) includes a disc-shaped chassis (11), a chassis wall (12) integrally extending upward along the axial direction at the edge of the chassis (11), the chassis wall (12) and the chassis (11) forming a groove structure, a chassis wall flange (13) integrally extending outward along the radial direction at the edge of the chassis wall (12), an air intake pipe (15) integrally formed downward along the axial direction at the center of the chassis (11), and a third thread (17) is provided on the outer peripheral wall of the air intake pipe (15).

3. The anti-backflow aerator for wastewater treatment according to claim 2, characterized in that: The chassis (11) is provided with a plurality of lightweight holes (14) arranged in a circular array.

4. The anti-backflow aerator for wastewater treatment according to claim 3, characterized in that: The airbag (2) includes an airbag disc (21) with an arc-shaped concave surface. An airbag flange (22) is integrally provided at the edge of the airbag disc (21) extending radially outward. An airbag connecting tube (23) is provided at the center of the airbag disc (21) and downward along the axial direction. The airbag disc (21) is stacked in the groove structure, and the airbag flange (22) overlaps with the chassis wall flange (13), and the airbag connecting tube (23) is coaxially inserted into the air intake pipe (15).

5. The anti-backflow aerator for wastewater treatment according to claim 4, characterized in that: The outer peripheral wall of the airbag connecting tube (23) is provided with a first thread (24), and the inner peripheral wall of the air inlet tube (15) is provided with a second thread (16) that mates with the first thread (24).

6. The anti-backflow aerator for wastewater treatment according to claim 5, characterized in that: The aeration membrane (3) has a circular sheet structure. The aeration membrane (3) includes an aeration membrane sheet (32) and an aeration membrane edge (33) from the inside to the outside. The multiple micropores (31) are arranged in the aeration membrane sheet (32). The aeration membrane edge (33) overlaps with the airbag flange (22). The pressure cap (4) has a circular sheet structure. The pressure cap (4) overlaps on the aeration membrane edge (33) and is connected to the chassis wall flange (13). The fixing ring (5) is sandwiched between the aeration membrane edge (33) and the airbag flange (22).

7. The anti-backflow aerator for wastewater treatment according to claim 1, characterized in that: The inner channel of the air inlet pipe (15) is provided with at least one variable diameter section along the gas flow direction. The radial cross section of the variable diameter section changes continuously and is used to guide the gas flow.

8. The anti-backflow aerator for sewage treatment according to claim 1, characterized in that: The airbag (2) is made of elastic material, and the aeration membrane (3) is made of TPU material.

9. The anti-backflow aerator for wastewater treatment according to claim 1, characterized in that: The pore size of the micropore (31) is 1-3 mm.

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