Novel secondary sedimentation tank center sludge backflow structure

Abstract

The utility model discloses a novel secondary sedimentation tank center sludge backflow structure which comprises a secondary sedimentation tank body, a supporting sleeve is installed in the middle of the inner bottom end of the secondary sedimentation tank body, sludge suction main pipes are installed at the top end of the supporting sleeve, a sludge suction pump is installed between the sludge suction main pipes, and sludge suction branch pipes are evenly distributed at the bottom ends of the sludge suction main pipes. The bottom end of each sludge suction branch pipe is connected with a sludge suction nozzle, a sludge collecting groove is formed in the outer side of each sludge suction nozzle, a sludge discharging pipe is arranged in the supporting sleeve, a sludge outlet of the sludge discharging pipe extends into a sludge pump room, a wall-attached gate is installed at the position, located at the sludge discharging opening of the sludge discharging pipe, in the sludge pump room, and the wall-attached gate is connected with the supporting sleeve. And a pull rod is mounted on the upper side of the wall-attached gate. According to the utility model, not only is the problem of low sludge suction efficiency caused by structural construction deviation reduced, but also the liquid level difference for controlling the sludge suction rate is canceled, and the electronic control system is used for controlling, so that accidental accidents in the operation process are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sludge return systems in sewage treatment plants, in particular to a novel central sludge return structure in a secondary sedimentation tank. Background Art

[0002] In order to precipitate and discharge the sludge in the sewage after biological treatment in a sewage treatment plant, the sewage after biological treatment needs to be passed into the secondary sedimentation tank to precipitate the sludge in the sewage, and the precipitated sludge needs to be discharged with the help of the central sludge return system pre-arranged in the secondary sedimentation tank.

[0003] At present, the central sludge return system in the secondary sedimentation tank of the sewage treatment plant mainly drives the bottom sludge suction pipe to rotate through the rotating main machine of the central transmission sludge suction machine, and presses the sludge at the bottom of the secondary sedimentation tank to the central sludge discharge pipe through the liquid level difference. The sludge discharge pipe is connected to the sludge pump room, and the hydraulic pressure is controlled by a liftable sleeve valve to control the sludge absorption efficiency. Although the sludge settled in the secondary sedimentation tank can be discharged under the above-mentioned sludge discharge method, the central sludge return system of the above-mentioned structure is prone to low system sludge suction efficiency due to structural construction deviation during construction. At the same time, the liquid level difference is used to control the sludge discharge efficiency, which makes the system's sludge discharge efficiency unstable. In addition, the lifting sleeve valve is used to control the hydraulic pressure, so that the system must be shut down in the event of a later failure to overhaul and maintain the equipment, which is not convenient for efficient use of the system. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] The technical problem to be solved by the utility model is to provide a new type of secondary sedimentation tank central sludge return structure in response to the current status of the existing technology, which can not only realize the extraction of sludge after sedimentation in the secondary sedimentation tank by active suction, but also facilitate the maintenance and inspection of the equipment without stopping production.

[0006] (II) Technical solution

[0007] The utility model is achieved through the following technical scheme: the utility model proposes a novel secondary sedimentation tank central sludge return structure, including a secondary sedimentation tank body, a support sleeve is installed at the middle of the bottom end of the secondary sedimentation tank body, a sludge suction main pipe is installed at the top of the support sleeve, a sludge suction pump is installed between the sludge suction main pipes, sludge suction branch pipes are evenly distributed at the bottom ends of the sludge suction main pipes, each of the sludge suction branch pipes is connected to a sludge suction nozzle at the bottom end, a sludge collecting trough is arranged on the outside of the sludge suction nozzle, a sludge discharge pipe is built in the support sleeve, the sludge outlet of the sludge discharge pipe extends to the sludge pump room, a wall-attached gate is installed at the sludge outlet of the sludge discharge pipe in the sludge pump room, and a pull rod is installed on the upper side of the wall-attached gate.

[0008] Furthermore, a connecting seat connected to the working bridge provided on the top of the secondary sedimentation tank body is also connected to the middle part of the top of the mud suction main pipe.

[0009] By adopting the above technical solution, the connecting seat can reliably support the working bridge provided at the top of the secondary sedimentation tank body.

[0010] Furthermore, the support sleeve is fixed to the secondary sedimentation tank body by welding through prefabricated steel plates, and the support sleeve is a hollow structure.

[0011] By adopting the above technical solution, the support sleeve is mainly used to stably support the mud suction main pipe and ensure the normal installation of the mud discharge pipe.

[0012] Furthermore, the mud discharge pipe passes through the support sleeve, and the bottom end of the secondary sedimentation tank body facing the bottom end of the support sleeve is a hollow structure.

[0013] By adopting the above technical solution, it can be ensured that the mud discharge pipe passes through the bottom of the secondary sedimentation tank smoothly.

[0014] Furthermore, the mud suction nozzle is connected to the mud suction branch pipe by bolts, and the mud collecting trough is connected to the mud suction branch pipe by bolts.

[0015] By adopting the above technical solution, the sludge suction nozzle is mainly used to guide the sludge settled in the secondary sedimentation tank to the sludge suction branch pipe.

[0016] Furthermore, the mud suction branch pipe is connected to the mud suction main pipe via a flange, and the mud suction pump is flange-connected to the mud suction main pipe.

[0017] By adopting the above technical solution, the sludge suction pump mainly discharges the sludge settled in the secondary sedimentation tank by active suction, and the sludge discharge efficiency is controlled by controlling the power of the sludge suction pump.

[0018] Furthermore, the pull rod is connected to the wall-attached gate in a binding manner, and the wall-attached gate is slidably connected to the mud discharge port of the mud discharge pipe.

[0019] By adopting the above technical solution and the wall-attached gate, it is convenient to maintain and inspect the equipment without stopping production.

[0020] Furthermore, the bottom of the mud suction main pipe is inclined from one end close to the mud suction pump to the other end.

[0021] By adopting the above technical solution, such a design can utilize the gravity of the sludge to realize the convenient flow of the sludge sucked in the sludge suction main pipe to the sludge suction pump.

[0022] Furthermore, the diameter of the mud suction main pipe is larger than the diameter of the mud suction branch pipe.

[0023] By adopting the above technical solution, this design facilitates the uniform guidance and discharge of the sucked sludge.

[0024] Furthermore, the mud suction branch pipes are symmetrically distributed on both sides of the support sleeve, and the mud suction branch pipes have two structures: a straight pipe and a curved pipe.

[0025] By adopting the above technical solution, the sludge suction branch pipe can realize the simultaneous suction and transportation of sludge in multiple places in the secondary sedimentation tank.

[0026] (III) Beneficial effects

[0027] Compared with the prior art, the utility model has the following beneficial effects:

[0028] In order to solve the problem that the central sludge return system in the secondary sedimentation tank of the current sewage treatment plant mainly drives the bottom sludge suction pipe to rotate through the rotating main machine of the central transmission sludge suction machine, and presses the sludge at the bottom of the secondary sedimentation tank to the central sludge discharge pipe through the liquid level difference. The sludge discharge pipe is connected to the sludge pump room, and the hydraulic pressure is controlled by a liftable sleeve valve to control the sludge absorption efficiency. Although the sludge settled in the secondary sedimentation tank can be discharged under the above-mentioned sludge discharge method, the central sludge return system of the above-mentioned structure is prone to low system sludge suction efficiency due to structural construction deviation during construction. At the same time, the liquid level difference is used to control the sludge discharge efficiency, which makes the system's sludge discharge efficiency unstable. In addition, the lifting sleeve valve is used to control the hydraulic pressure, so that the system must be shut down in the event of a later failure. The problem that the equipment cannot be inspected and maintained, and the system is not convenient for efficient use is solved. The utility model lifts the sludge suction main pipe in the secondary sedimentation tank to the upper clear liquid position, pumps the lower settled sludge to the sludge suction main pipe through the sludge suction pump, and then pumps the sludge to the sludge pump room through the sludge discharge pipe pre-buried at the bottom of the secondary sedimentation tank, so as to discharge the sludge in the secondary sedimentation tank. Under this sludge discharge system, not only the problem of low sludge suction efficiency caused by structural construction deviation is reduced, but also the sludge suction rate is controlled by the electronic control system instead of the liquid level difference, which reduces accidental accidents during operation. At the same time, the lifting sleeve valve is cancelled and the wall-attached gate is adopted, which is convenient for maintenance and inspection of system equipment without stopping production, and convenient for efficient use of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural schematic diagram of a novel central sludge return structure of a secondary sedimentation tank described in the utility model:

[0030] 1. Mud suction nozzle; 2. Mud suction branch pipe; 3. Mud suction main pipe; 4. Mud suction pump; 5. Mud discharge pipe; 6. Wall-attached gate; 7. Connecting seat; 8. Mud collecting trough; 9. Second sedimentation tank body; 10. Support sleeve; 11. Mud pump room; 12. Pull rod. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0032] like Figure 1 As shown, a novel secondary sedimentation tank central sludge return structure in this embodiment includes a secondary sedimentation tank body 9, a support sleeve 10 is installed at the middle of the bottom end of the secondary sedimentation tank body 9, a sludge suction main pipe 3 is installed at the top of the support sleeve 10, a sludge suction pump 4 is installed between the sludge suction main pipes 3, and sludge suction branches 2 are evenly distributed at the bottom of the sludge suction main pipes 3. A sludge suction nozzle 1 is connected to the bottom of each sludge suction branch pipe 2. The sludge suction nozzle 1 is mainly used to guide the sludge settled in the secondary sedimentation tank body 9 to the sludge suction branch pipe 2. The outer side of the sludge suction nozzle 1 is arranged A mud collecting trough 8 is provided, a mud discharge pipe 5 is built in the support sleeve 10, the mud outlet of the mud discharge pipe 5 extends to the sludge pump room 11, and a wall-attached gate 6 is installed at the mud outlet of the mud discharge pipe 5 in the sludge pump room 11. A pull rod 12 is installed on the upper side of the wall-attached gate 6. The mud suction pump 4 mainly discharges the sludge precipitated in the secondary sedimentation tank 9 by active suction. The mud discharge efficiency is controlled by controlling the power of the mud suction pump 4. The wall-attached gate 6 is used to facilitate equipment maintenance and inspection without stopping production.

[0033] like Figure 1 As shown, in this embodiment, a connecting seat 7 connected to the working bridge on the top of the secondary sedimentation tank body 9 is also connected to the middle of the top of the mud suction main pipe 3. The connecting seat 7 can reliably support the working bridge on the top of the secondary sedimentation tank body 9. The support sleeve 10 is fixed to the secondary sedimentation tank body 9 by welding with prefabricated steel plates. The support sleeve 10 is a hollow structure. The support sleeve 10 is mainly used to stably support the mud suction main pipe 3 and ensure the normal installation of the mud discharge pipe 5.

[0034] like Figure 1 As shown, in this embodiment, the mud discharge pipe 5 passes through the support sleeve 10, and the bottom end of the second sedimentation tank body 9 is opposite to the bottom end of the support sleeve 10, which is a hollow structure, which can ensure that the mud discharge pipe 5 passes through the bottom of the second sedimentation tank body 9 smoothly, the mud suction nozzle 1 is bolted to the mud suction branch pipe 2, the mud collecting trough 8 is bolted to the mud suction branch pipe 2, the mud suction branch pipe 2 is flange-connected to the mud suction main pipe 3, the mud suction pump 4 is flange-connected to the mud suction main pipe 3, the pull rod 12 is connected to the wall-attached gate 6 in a bundled manner, and the wall-attached gate 6 is slidably connected to the mud discharge port of the mud discharge pipe 5.

[0035] like Figure 1As shown, in this embodiment, the bottom of the sludge suction main pipe 3 is inclined from one end close to the sludge suction pump 4 to the other end. This design can use the gravity of the sludge to realize the convenient flow of the sludge sucked in the sludge suction main pipe 3 to the sludge suction pump 4. The diameter of the sludge suction main pipe 4 is larger than the diameter of the sludge suction branch pipe 2. This design is convenient for uniformly guiding and discharging the sucked sludge. The sludge suction branch pipe 2 is symmetrically distributed on both sides of the support sleeve 10, and the sludge suction branch pipe 2 has two structures of straight pipe and curved pipe. The sludge suction branch pipe 2 can realize the simultaneous suction and guiding of sludge in multiple places in the secondary sedimentation tank.

[0036] The specific implementation process of this embodiment is as follows: When in use, just install the mud suction main pipe 3, the mud suction branch pipe 2, the mud suction pump 4 and the wall-mounted gate 6 as shown in the following figure: Figure 1 The sludge return system of the secondary sedimentation tank center can be installed in the manner shown, and then the sludge return system of the secondary sedimentation tank center can be put into use. During use, the sludge suction main pipe 3 in the secondary sedimentation tank body 9 is lifted to the upper clear liquid position, the lower precipitated sludge is pumped to the sludge suction main pipe 3 through the sludge suction pump 4, and then the sludge is pumped to the sludge pump room 11 through the sludge discharge pipe 5 pre-buried at the bottom of the secondary sedimentation tank body 9, so as to realize the discharge of sludge in the secondary sedimentation tank body 9. Under this sludge discharge system, not only the problem of low sludge suction efficiency caused by structural construction deviation is reduced, but also the liquid level difference is cancelled to control the sludge suction rate, and it is controlled by the electronic control system instead, which reduces accidental accidents during operation. At the same time, the lifting sleeve valve is cancelled and the wall-attached gate 6 is adopted, which is convenient for maintenance and inspection of system equipment without stopping production, and convenient for efficient use of the system.

[0037] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A novel central sludge return structure of the secondary sedimentation tank, characterized by: The invention comprises a secondary sedimentation tank body (9), wherein a support sleeve (10) is installed at the middle of the bottom end of the secondary sedimentation tank body (9), a sludge suction main pipe (3) is installed at the top end of the support sleeve (10), a sludge suction pump (4) is installed between the sludge suction main pipes (3), sludge suction branch pipes (2) are evenly distributed at the bottom end of the sludge suction main pipes (3), and each sludge suction branch pipe (2) is connected to a sludge suction nozzle (1) at the bottom end, and a sludge collecting trough (8) is arranged on the outside of the sludge suction nozzle (1), and a sludge discharge pipe (5) is built in the support sleeve (10), and the sludge outlet of the sludge discharge pipe (5) extends into a sludge pump room (11), and a wall-attached gate (6) is installed at the sludge outlet of the sludge discharge pipe (5) in the sludge pump room (11), and a pull rod (12) is installed on the upper side of the wall-attached gate (6).

2. A novel central sludge return structure of a secondary sedimentation tank according to claim 1, characterized in that: The middle part of the top end of the mud suction main pipe (3) is also connected to a connecting seat (7) which is connected to the working bridge provided at the top of the secondary sedimentation tank body (9).

3. A novel central sludge return structure of a secondary sedimentation tank according to claim 1, characterized in that: The support sleeve (10) is fixed to the secondary sedimentation tank body (9) by welding a prefabricated steel plate, and the support sleeve (10) is a hollow structure.

4. A novel central sludge return structure for secondary sedimentation tank according to claim 3, characterized in that: The mud discharge pipe (5) passes through the support sleeve (10), and the bottom end of the secondary sedimentation tank body (9) facing the bottom end of the support sleeve (10) is a hollow structure.

5. A novel central sludge return structure of a secondary sedimentation tank according to claim 1, characterized in that: The mud suction nozzle (1) is connected to the mud suction branch pipe (2) by bolts, and the mud collecting trough (8) is connected to the mud suction branch pipe (2) by bolts.

6. A novel secondary sedimentation tank central sludge return structure according to claim 1, characterized in that: The mud suction branch pipe (2) is connected to the mud suction main pipe (3) via a flange, and the mud suction pump (4) is connected to the mud suction main pipe (3) via a flange.

7. A novel central sludge return structure of a secondary sedimentation tank according to claim 1, characterized in that: The pull rod (12) is connected to the wall-attached gate (6) in a binding manner, and the wall-attached gate (6) is slidably connected to the mud discharge port of the mud discharge pipe (5).

8. A novel central sludge return structure of a secondary sedimentation tank according to claim 1, characterized in that: The bottom of the mud suction main pipe (3) is inclined from one end close to the mud suction pump (4) to the other end.

9. A novel central sludge return structure for a secondary sedimentation tank according to claim 1, characterized in that: The diameter of the mud suction main pipe (3) is greater than the diameter of the mud suction branch pipe (2).

10. A novel central sludge return structure for a secondary sedimentation tank according to claim 1, characterized in that: The mud suction branch pipes (2) are symmetrically distributed on both sides of the support sleeve (10), and the mud suction branch pipes (2) have two structures: a straight pipe shape and a curved pipe shape.

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