A backwashing device for a secondary sedimentation tank sludge channel

Abstract

The back flushing device comprises a gas generating device and a plurality of force gas pipes, the gas generating device comprises a cylinder wall, a piston rod and a sealing ring are arranged in the cylinder wall, a piston wall is arranged between the piston rod and the cylinder wall, a cylinder top cover is arranged on the upper side of the cylinder wall, a cylinder bottom plate is arranged on the lower side of the cylinder wall, an air outlet hose is arranged on the cylinder bottom plate, and an air outlet is further arranged on the air outlet hose; an air inlet hole and an air inlet valve are arranged on the upper part of the sealing ring, a piston body and a piston body base are arranged on the lower part of the sealing ring, a valve spring and an O-shaped ring are further arranged in the sealing ring; a plurality of sets of gas booster devices are arranged in the force gas pipe, the gas booster device comprises a contraction pipe, a throat pipe and an expansion pipe, the throat pipe is provided with a transmission mechanism, a drainage hole and a lateral branch pipe; the portable gas generating device is combined with the force gas pipe, the clogging of the hole is cleared by generating amplified gas flow, and the purpose of dredging is achieved.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and in particular relates to a backwashing device for a sludge discharge trough in a secondary sedimentation tank. Background Technology

[0002] In wastewater treatment plants, the secondary sedimentation tank plays a crucial role in reducing suspended solids and settling sludge within the secondary treatment unit. Sludge enters the sludge discharge trough through holes in the tank's bottom cover, and is then drawn into the discharge channel via a sleeve valve, achieving both sludge discharge and recirculation. However, due to the influence of influent water quality and hydraulic conditions within the tank, stones and compacted sludge often clog the holes in the sludge discharge trough cover, resulting in poor sedimentation.

[0003] In recent years, my country has continuously raised its requirements for ecological civilization construction, and more and more sewage treatment plants are adopting the covered construction method. This makes it impossible for operation and maintenance personnel to directly observe the sedimentation effect inside the tank, further increasing the maintenance difficulty of the sludge discharge tank. The common method for maintaining the sludge discharge tank is to empty the sewage in the tank and have the operation and maintenance personnel go down to the bottom of the tank to check and repair it one by one. They use tools to open the sludge discharge tank cover and remove the blocking stones and hardened sludge. Although this method is the most effective, it is cumbersome and costly. There are also devices that install high-pressure water jet nozzles that are automatically or manually turned on at regular intervals in the sludge discharge tank to achieve automatic timed flushing of the tank and holes or manual flushing. However, this method has limited effect on sludge accumulation and cannot reach the level of manual treatment. Summary of the Invention

[0004] To address the problems of cumbersome and costly manual inspection and maintenance when sludge discharge channels in secondary sedimentation tanks become clogged, requiring the tank to be emptied of wastewater beforehand, and the inability of automatically or manually operated high-pressure water jets to completely remove blockages, this invention provides a backwashing device for secondary sedimentation tank sludge discharge channels. This device effectively solves the problem of frequent sludge discharge channel blockages, eliminating the need for emptying the tank and manual inspection, as well as the need for high-pressure water jets. It achieves unobstructed sludge discharge simply by generating a large airflow to clear blockages from the orifices. To achieve these objectives, this invention employs the following technical solution: A backwashing device for a sludge discharge trough in a secondary sedimentation tank, the backwashing device comprising a gas generating device and multiple jet pipes, the gas generating device comprising a cylinder wall, a piston rod and a sealing ring disposed within the cylinder wall, a piston wall disposed between the piston rod and the cylinder wall, a handle disposed at the top of the piston rod, a cylinder top cover disposed on the upper side of the cylinder wall, a cylinder bottom plate disposed on the lower side of the cylinder wall, an air outlet hose disposed on the cylinder bottom plate, and an air outlet disposed on the air outlet hose; the sealing ring comprising an air inlet and an air inlet valve disposed at the upper part, a piston body and a piston body base disposed at the lower part of the sealing ring, and a valve spring and an O-ring disposed within the sealing ring; The gas pressurization tube is equipped with multiple gas pressurization devices, each including a constriction tube, a throat tube, and an expansion tube. The throat tube is equipped with multiple transmission mechanisms, multiple drainage holes, and a set of lateral branches. The constriction tube and expansion tube are also equipped with miniature sensors, and the miniature sensors and transmission mechanisms are electrically connected to the controller.

[0005] Preferably, a return spring is provided between the handle and the cylinder top cover.

[0006] Preferably, the lower end of the piston rod is inserted into the sealing ring.

[0007] Preferably, a valve spring is also provided at the lower end of the piston rod. The valve spring is disposed inside the sealing ring. One end of the valve spring is connected to the intake valve, and the other end of the valve spring is connected to the piston body.

[0008] Preferably, there are two sets of air inlets, which are symmetrically distributed on both sides of the piston rod, and one set of air inlets, which is located below the air inlets.

[0009] Preferably, the number of O-rings is set to 2 sets.

[0010] Preferably, the piston body base is disposed on the outside of the piston body.

[0011] Preferably, the constriction tube, throat tube, and dilation tube are arranged in order from top to bottom.

[0012] Preferably, the transmission mechanism is provided in 4 sets, and the transmission mechanism is symmetrically arranged on both sides of the throat.

[0013] Preferably, the lateral branch pipe is disposed between the transmission mechanisms.

[0014] The present invention has the following advantages over the prior art: 1. This invention fully solves the problem of frequent blockage in the sludge discharge trough of existing secondary sedimentation tanks. By using a portable gas generating device in conjunction with an impingement air pipe, air is input into the impingement air pipe through piston action. The gas flow rate is increased through the internal structure of the air pipe, and the impact of the gas is used to severely damage the blockage entering the sludge discharge trough, thereby achieving the purpose of smooth sludge discharge.

[0015] 2. The gas generating device of the present invention can be stored in a warehouse at any time. When the sludge discharge trough is blocked, it can be quickly connected to the corresponding impingement air pipe to start the impact operation. The impingement air pipe can be installed together with other equipment in the secondary sedimentation tank during construction, with its end inserted into the sludge discharge trough. The air outlet of the impingement air pipe is installed perpendicular to the direction of sludge settling, which facilitates the flow of gas through the entire sludge discharge trough. Compared with the traditional method of directly connecting the air pipe to the aeration system for backwashing, the present invention saves the wear and tear of related valves and pipes, and also avoids the disadvantage of excessive air velocity in the aeration system causing turbulent flow in the secondary sedimentation tank and affecting the sedimentation effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility device after it is installed in the secondary sedimentation tank.

[0017] Figure 2 This is a schematic diagram of the structure of the practical gas generating device; Figure 3 This is a schematic diagram of the internal structure of the practical gas booster device.

[0018] The components are as follows: 1. Handle; 2. Return spring; 3. Cylinder top cover; 4. Piston rod; 5. Cylinder wall; 6. Piston wall; 7. Sealing ring; 8. O-ring; 9. Piston body; 10. Piston body base; 11. Outlet hose; 12. Cylinder base plate; 13. Valve spring; 14. Inlet valve; 15. Inlet port; 16. Contraction tube; 17. Throat tube; 18. Expansion tube; 19. Transmission structure; 20. Drainage hole; 21. Side branch pipe; 22. Miniature sensor; 23. Controller; 24. Gas generation device; 25. Impulse gas pipe; 26. Gas booster device. Detailed Implementation

[0019] The present invention will now be further described with reference to the accompanying drawings and specific embodiments: To make the objectives, technical solutions, and advantages of this invention clearer and more explicit, the invention will be further described below with reference to the accompanying drawings and embodiments, and relevant terms will be explained.

[0020] Example 1: like Figures 1 to 3 As shown, a backwashing device for a secondary sedimentation tank sludge discharge channel includes a flexibly movable gas generating device 24 and multiple flushing air pipes 25. Each sludge discharge channel is equipped with a flushing air pipe 25, which is installed simultaneously with other equipment in the secondary sedimentation tank during construction. The bottom of the flushing air pipe 25 is connected to the sludge discharge channel through a nozzle, and the top extends upward to the operation and maintenance platform. In normal idle state, the top opening of the flushing air pipe 25 is sealed with a pipe cap to prevent impurities from entering the pipe and causing blockage.

[0021] The gas generating device 24 is a core gas power generating component. Its main body is the cylinder wall 5. The cylinder wall 5 is equipped with a piston rod 4 and a sealing ring 7. The piston rod 4 is movably inserted inside the cylinder wall 5. A sealing ring 7 is also provided between the piston rod 4 and the cylinder wall 5, and the lower end of the piston rod 4 is inserted into the sealing ring 7 to ensure the airtightness of the cavity.

[0022] The upper part of the sealing ring 7 is provided with an air inlet 15 and an air inlet valve 14. There are two sets of air inlets 15, which are symmetrically distributed on both sides of the piston rod 4. The air inlet valve 14 is a one-way valve and is located on the lower side of one set of air inlets 15. The lower part of the sealing ring 7 is provided with a piston body 9 and a piston body base 10. A valve spring 13 and an O-ring 8 are also provided inside the sealing ring 7. The number of O-rings 8 is set to two sets, which can further enhance the airtightness of the device and prevent gas leakage.

[0023] A handle 1 is fixedly installed at the top of the piston rod 4 for maintenance personnel to hold and press to generate gas; a cylinder top cover 3 is installed on the upper side of the cylinder wall 5, and a return spring 2 is installed between the handle 1 and the cylinder top cover 3. The return spring 2 can automatically drive the piston rod and other piston components to return to their original position after the handle 1 is pressed down, which facilitates cyclic operation; a cylinder base plate 12 is installed on the lower side of the cylinder wall 5. The cylinder base plate 12 can provide stable support for the entire gas generating device 24, and an outlet hose 11 is installed on the cylinder base plate 12. An outlet is installed on the outlet hose 11 to serve as a gas output channel. A valve spring 13 is installed at the lower end of the piston rod 4. One end of the valve spring 13 is connected to the intake valve 14, and the other end is connected to the piston body 9. The valve spring 13 controls the opening and closing of the intake valve 14. When the handle 1 is pulled up, the valve spring 13 extends and tensile stress occurs. The intake valve 14 opens to allow air in under the tension of the valve spring 13. When the handle 1 is pressed down, the valve spring 13 is compressed and quickly rebounds under its own elastic force, pushing the intake valve 14 to close, thus achieving unidirectional airflow and preventing gas backflow.

[0024] In addition, the cylinder wall 5 is also provided with a piston wall 6 and a piston body 9. The piston wall 6 is located between the piston rod 4 and the cylinder wall 5. Specifically, part of it is located on the upper side of the sealing ring 7 and part of it is located on the upper side of the intake valve 14. The piston body 9 is located at the lower part of the sealing ring 7, and the piston body base 10 is located on the outer side of the piston body 9 to further enhance the pressing force of the piston body 9.

[0025] Multiple gas pressurization devices 26 are installed inside the gas pipe 25. Each gas pressurization device 26 includes a constriction tube 16, a throat 17, and an expansion tube 18, arranged sequentially from top to bottom. Gas can flow along the direction from the constriction tube 16 to the throat 17 and then to the expansion tube 18, achieving gas acceleration and pressurization through changes in the flow cross-section. The throat 17 is equipped with multiple transmission mechanisms 19, multiple drainage holes 20, and a set of lateral branch pipes 21. Miniature sensors 22 are also installed inside the constriction tube 16 and the expansion tube 18. The miniature sensors 22 are electrically connected to an external controller 23, which can monitor the pressure or flow rate of the gas inside the pipe in real time and transmit the signal to the controller 23.

[0026] The throat 17 is an adjustable actuator with four sets of transmission structures 19 symmetrically arranged on its outer side. The transmission structures 19 are also electrically connected to the controller 23. The controller 23 can send instructions to the transmission structures 19 according to the signal of the micro sensor 22, and adjust the opening of the throat 17 through the transmission structures 19 to keep the airflow acceleration effect in the high-efficiency range.

[0027] The throat 17 has multiple drainage holes 20, and a set of lateral branch pipes 21 are connected to the multiple drainage holes 20. The lateral branch pipes 21 are arranged between the transmission mechanisms 19. One end of the lateral branch pipe 21 is connected to the atmospheric environment, and the other end is connected to the throat 17. Gas enters the throat 17 from the contraction tube 16, the flow rate increases sharply, the static pressure decreases, and a negative pressure is formed in the throat 17 area. Under the action of pressure difference, the outside air is automatically drawn into the throat 17 through the lateral branch pipes 21, which increases the air volume.

[0028] In addition, the inner wall of the impingement tube 25 or the inner wall of the throat tube 17 can be polished and coated with a high gloss finish. The contours of the contraction tube 16 and the expansion tube 18 are optimized into a continuous and smooth curved structure to minimize the frictional resistance of gas flow and reduce flow separation and turbulence generation.

[0029] In this embodiment, the inlet diameter of the contraction tube 16 can be set to the range of 100-200mm, the cone angle of the contraction section is controlled within the range of 20°~30°, the contraction ratio of the throat 17 to the contraction tube 16 is 0.4~0.7, and the length of the throat 17 is slightly larger than its throat diameter to ensure the formation of a stable high-speed airflow zone; the cone angle of the expansion section of the expansion tube 18 is controlled within the range of 5°~15°, so that the airflow can smoothly restore pressure in the expansion section and reduce energy loss. Specifically, the inlet diameter of the contraction tube 16 of the device of the present invention is preferably set to 120mm, the cone angle of the contraction section is 24°, the contraction ratio of the throat 17 to the contraction tube 16 is 0.6, and the cone angle of the expansion section of the expansion tube 18 is 10°.

[0030] When a sludge discharge trough in the secondary sedimentation tank becomes blocked, remove the cap from the top of the corresponding air pump 25, seal the outlet of the gas generating device 24 with the top opening of the air pump 25, and have the maintenance personnel push the handle 1 repeatedly. This causes the piston rod 4 to move the piston body 9 up and down within the cylinder wall 5, compressing and drawing in air. The compressed gas is then sent into the air pump 25, where it passes through multiple gas booster devices 26 to achieve progressive acceleration and pressurization. Finally, the high-speed gas enters the sludge discharge trough through the nozzle at the bottom of the air pump 25, directly clearing the blockage at the sludge discharge trough cover and quickly restoring the sludge discharge flow.

Claims

1. A backwashing device for a sludge discharge trough in a secondary sedimentation tank, the backwashing device comprising a gas generating device and multiple flushing air pipes, characterized in that, The gas generating device includes a cylinder wall, inside which a piston rod and a sealing ring are disposed. A piston wall is disposed between the piston rod and the cylinder wall. A handle is disposed at the top of the piston rod. A cylinder top cover is disposed on the upper side of the cylinder wall. A cylinder bottom plate is disposed on the lower side of the cylinder wall. An exhaust hose is disposed on the cylinder bottom plate. An exhaust port is disposed on the exhaust hose. An air inlet and an air inlet valve are disposed on the upper part of the sealing ring. A piston body and a piston body base are disposed on the lower part of the sealing ring. A valve spring and an O-ring are disposed inside the sealing ring. The gas pressurization tube is equipped with multiple gas pressurization devices, each including a constriction tube, a throat tube, and an expansion tube. The throat tube is equipped with multiple transmission mechanisms, multiple drainage holes, and a set of lateral branches. The constriction tube and expansion tube are also equipped with miniature sensors, and the miniature sensors and transmission mechanisms are electrically connected to the controller.

2. The backwashing device for a sludge discharge trough in a secondary sedimentation tank according to claim 1, characterized in that, A return spring is provided between the handle and the cylinder top cover.

3. The backwashing device for a sludge discharge trough in a secondary sedimentation tank according to claim 1, characterized in that, The lower end of the piston rod is inserted into the sealing ring.

4. A backwashing device for a sludge discharge trough in a secondary sedimentation tank according to claim 3, characterized in that, A valve spring is also provided at the lower end of the piston rod. The valve spring is located inside the sealing ring. One end of the valve spring is connected to the intake valve, and the other end of the valve spring is connected to the piston body.

5. A backwashing device for a sludge discharge trough in a secondary sedimentation tank according to claim 1, characterized in that, Two sets of air intake holes are provided, which are symmetrically distributed on both sides of the piston rod. One set of air intake valves is provided, which is located on the lower side of the air intake holes.

6. A backwashing device for a sludge discharge trough in a secondary sedimentation tank according to claim 1, characterized in that, The number of O-rings is set to 2 sets.

7. A backwashing device for a sludge discharge trough in a secondary sedimentation tank according to claim 1, characterized in that, The piston body base is located on the outside of the piston body.

8. A backwashing device for a sludge discharge trough in a secondary sedimentation tank according to claim 1, characterized in that, The contraction tube, throat tube, and expansion tube are arranged in order from top to bottom.

9. A backwashing device for a sludge discharge trough in a secondary sedimentation tank according to claim 1, characterized in that, The transmission mechanism is provided in 4 sets, and the transmission mechanism is symmetrically arranged on both sides of the throat.

10. A backwashing device for a sludge discharge trough in a secondary sedimentation tank according to claim 1, characterized in that, The lateral branch pipes are arranged between the transmission mechanisms.

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