A membrane filtration system backwash tank noise reduction system

Abstract

This utility model belongs to the field of noise reduction technology for backflushing tanks, and particularly relates to a noise reduction system for a membrane filtration system's backflushing tank. The system includes a backflushing tank, a gas collection tank, a noise-reducing exhaust pipe, and a pressure-reducing silencing structure. The noise-reducing exhaust pipe includes a flared noise-reducing fitting, an exhaust pipe, and a sound insulation structure. One end of the exhaust pipe is connected to the outlet pipe of the backflushing tank via the flared noise-reducing fitting, and the other end extends into the gas collection tank. The diameter of the inlet end of the flared noise-reducing fitting is larger than the diameter of the exhaust end. The pressure-reducing silencing structure is installed inside the gas collection tank and includes an inner silencing pipe, an outer silencing pipe, and at least two stages of flow control pipes. The inner silencing pipe, the at least two stages of flow control pipes, and the outer silencing pipe are coaxially arranged from the inside out, and flow control holes are evenly distributed on the pipe walls. A pressure-diffusing space is formed between adjacent pipes. This utility model solves the problem of excessive noise generated by the backflushing tank pipe in the membrane filtration system, which affects on-site personnel and passersby, by modifying the pipe and the pressure-reducing silencing structure and reducing the fluid flow velocity.

Description

Technical Field

[0001] This utility model belongs to the field of noise reduction technology for backwash tanks, and particularly relates to a membrane filtration system backwash tank noise reduction system. Background Technology

[0002] During operation, the concentrated liquid in the membrane filtration system is filtered to produce a clear liquid through internal pressure. During this process, a filter cake layer easily forms on the inner surface of the membrane tubes, affecting filtration efficiency. To promptly remove the salt sludge from the inner surface filter cake, a backflushing tank is required to periodically backflush the inner surface of the membrane tubes to eliminate the filter cake and improve filtration efficiency. When the backflushing tank is replenished, compressed air inside the tank is released into the air through the pipeline. The gas discharge time is as long as 25 seconds. In currently used pipeline designs, the gas flow velocity inside the pipe can reach 34.80 m / s, generating a momentary, piercing noise. This occurs approximately 36 times per day, significantly impacting on on-site staff and passersby.

[0003] Currently, the unreasonable design of the backwash tank pipeline in membrane filtration systems leads to excessive noise during exhaust. Therefore, designing a noise reduction system for the backwash tank of membrane filtration systems is a technical problem that urgently needs to be solved in this field. Utility Model Content

[0004] In order to solve the problems existing in the prior art, this utility model provides a membrane filtration system backwash tank noise reduction system.

[0005] The technical solution adopted by this utility model to solve this problem is:

[0006] A membrane filtration system backwash tank noise reduction system includes a backwash tank and a gas collection tank, and further includes:

[0007] The noise-reducing exhaust pipe includes a flared noise-reducing fitting, an exhaust pipe, and a sound insulation structure wrapped around the outside of the exhaust pipe. One end of the exhaust pipe is connected to the outlet pipe of the backflushing tank through the flared noise-reducing fitting, and the other end extends into the gas collection tank. The diameter of the inlet end of the flared noise-reducing fitting is larger than the diameter of the exhaust end.

[0008] The pressure-reducing and silencing structure is installed inside the gas collection tank. It includes an inner silencing pipe, an outer silencing pipe, and at least two stages of flow control pipes disposed between the inner and outer silencing pipes. The inner silencing pipe, the at least two stages of flow control pipes, and the outer silencing pipe are coaxially arranged from the inside to the outside and have flow control holes evenly distributed on the pipe walls. A diffusion space is formed between adjacent pipes. One end of the inner silencing pipe is closed and the other end is connected to the exhaust pipe. Both ends of the flow control pipe and the outer silencing pipe are closed.

[0009] In the above technical solution, the top of the backflushing tank is provided with an air inlet pipe, an air outlet pipe, and a liquid inlet pipe, and the bottom is provided with a liquid outlet pipe. The backflushing tank is connected to the membrane filtration system through the liquid outlet pipe.

[0010] In the above technical solution, the air inlet pipe, the liquid inlet pipe, and the liquid outlet pipe are all equipped with switching valves, and the air outlet pipe is equipped with a slow-speed switching valve.

[0011] In the above technical solution, the flared noise reduction pipe fitting is a tapered reducer with a gradually increasing pipe diameter.

[0012] In the above technical solution, the flared noise reduction pipe fitting is a stepped flared structure, including at least two tapered reducers that are connected in sequence and whose diameters increase in sequence.

[0013] In the above technical solution, the sound insulation structure is sound insulation cotton wrapped around the outside of the exhaust pipe.

[0014] In the above technical solution, there are two flow control tubes, namely a primary flow control tube and a secondary flow control tube. The diameters of the inner silencer tube, the primary flow control tube, the secondary flow control tube, and the outer silencer tube increase sequentially. The inner silencer tube, the primary flow control tube, the secondary flow control tube, and the outer silencer tube form three diffusion spaces that are interconnected by flow control holes.

[0015] In the above technical solution, the silencing inner tube, the primary flow control tube, the secondary flow control tube, and the silencing outer tube are all steel pipes with perforated walls.

[0016] In the above technical solution, the gas collection tank includes a sealed tank body and a tank cover. The tank body is also provided with an elastic silencing structure surrounding the pressure-reducing silencing structure. An elastic silencing layer is provided on the side of the elastic silencing structure facing the pressure-reducing silencing structure.

[0017] In the above technical solution, the elastic noise reduction structure is a barrel-shaped structure with an open top. A conical inner cavity is formed inside the elastic noise reduction structure. The pressure-reducing noise reduction structure is located inside the conical inner cavity. An elastic noise reduction layer adapted to the shape is attached to the inner wall of the conical inner cavity. A conical hole is opened at the bottom of the conical inner cavity.

[0018] In the above technical solution, the elastic noise reduction structure includes a support ring and a plurality of noise reduction perforated plates. Each of the noise reduction perforated plates is fixed at a certain angle to the lower end of the support ring and is arranged in a ring array around the central axis of the support ring. The pressure reduction noise reduction structure is located within the space surrounded by each noise reduction perforated plate. An elastic noise reduction layer adapted to the shape of the noise reduction perforated plate is attached to the side of the noise reduction perforated plate facing the pressure reduction noise reduction structure.

[0019] The advantages and positive effects of this utility model are:

[0020] 1. This utility model solves the problem of excessive noise generated by the backwash tank pipeline in the membrane filtration system, which affects on-site staff and passersby, by modifying the pipeline and the pressure-reducing and noise-reducing structure and reducing the fluid flow rate.

[0021] 2. In this utility model, by using tapered reducing pipe fittings and increasing the pipe diameter, the gas flow velocity in the pipe can be reduced by 60%, and the noise peak can be reduced from 90dB to below 75dB; furthermore, by wrapping the exhaust pipe 11 with the sound insulation structure 12, more than 60% of the main body noise can be blocked, and the noise in the work area can be reduced by another 10-15dB.

[0022] 3. In this utility model, a pressure-reducing and noise-reducing structure is adopted, and the compressed air can be diffused and decelerated at least four times, which can slow down the compressed air emission speed, thereby forming a low-pressure gas before being ejected. During this process, the noise is greatly reduced, thus reducing the noise of the emitted gas. Attached Figure Description

[0023] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that these drawings are designed for illustrative purposes only and are not intended to limit the scope of this utility model. In addition, unless otherwise specified, these drawings are intended only to conceptually illustrate the structural construction described herein and are not necessarily drawn to scale.

[0024] Figure 1 This is a schematic diagram of the backwash tank noise reduction system of the membrane filtration system in Example 1;

[0025] Figure 2 yes Figure 1 The main view;

[0026] Figure 3 yes Figure 1 A schematic diagram of a half-section structure;

[0027] Figure 4 yes Figure 3 The main view;

[0028] Figure 5 This is a cross-sectional schematic diagram of the pressure-reducing and noise-reducing structure;

[0029] Figure 6 This is a schematic diagram of the membrane filtration system and backflushing tank noise reduction system using progressively flared noise reduction pipe fittings in Example 1.

[0030] Figure 7 yes Figure 6 The main view;

[0031] Figure 8 This is an exploded view of the gas collection tank in Example 2;

[0032] Figure 9This is a half-section structural diagram of the gas collecting tank in Example 2;

[0033] Figure 10 yes Figure 9 The main view;

[0034] Figure 11 This is an exploded view of the gas collecting tank in Example 3;

[0035] Figure 12 This is a half-sectional structural diagram of the gas collecting tank in Example 3;

[0036] Figure 13 yes Figure 12 The main view;

[0037] Figure 14 This is a schematic diagram of the elastic noise-absorbing structure in Example 3;

[0038] Figure 15 yes Figure 14 The main view;

[0039] Figure 16 yes Figure 14 Top view.

[0040] In the diagram: 1-Silencer outer pipe; 2-Silencer inner pipe; 3-Flow control pipe; 4-Secondary diffusion space; 5-Tertiary diffusion space; 6-Fourth diffusion space; 7-Flow control orifice; 8-Backwash tank; 9-Gas collection tank; 10-Flanged noise reduction fitting; 11-Exhaust pipe; 12-Sound insulation structure; 13-Outlet pipe; 14-Inlet pipe; 15-Switch valve; 16-Liquid inlet pipe; 17-Liquid outlet pipe; 18-Slow-speed switch valve; 19-Elastic silencing layer; 20-Conical inner cavity; 21-Conical hole; 22-Support ring; 23-Silencer perforated plate. Detailed Implementation

[0041] First, it should be noted that the specific structure, features, and advantages of this utility model will be described in detail below by way of examples. However, all descriptions are for illustrative purposes only and should not be construed as limiting the utility model in any way. Furthermore, any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the accompanying drawings, can still be arbitrarily combined or deleted among these technical features (or their equivalents) to obtain more other embodiments of this utility model that may not be directly mentioned herein. Additionally, for the sake of simplifying the drawings, the same or similar technical features may be indicated only in one place in the same drawing.

[0042] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," and "screw-on" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. The utility model will now be described in detail with reference to the accompanying drawings. Example 1

[0043] A membrane filtration system backwash tank noise reduction system includes a backwash tank 8 and a gas collection tank 9, and further includes:

[0044] The noise reduction exhaust pipe includes a flared noise reduction fitting 10, an exhaust pipe 11, and a sound insulation structure 12 wrapped around the outside of the exhaust pipe. One end of the exhaust pipe 11 is connected to the outlet pipe 13 of the backflushing tank 8 through the flared noise reduction fitting 10, and the other end extends into the gas collection tank 9. The diameter of the inlet end of the flared noise reduction fitting 10 is larger than the diameter of the exhaust end.

[0045] The pressure-reducing and silencing structure is installed inside the gas collection tank 9. It includes an inner silencing pipe 2, an outer silencing pipe 1, and at least two stages of flow control pipes 3 arranged between the inner silencing pipe 2 and the outer silencing pipe 1. The inner silencing pipe 2, the at least two stages of flow control pipes 3, and the outer silencing pipe 1 are arranged coaxially from the inside to the outside and have flow control holes 7 evenly distributed on the pipe walls. A pressure-diffusing space is formed between adjacent pipes. One end of the inner silencing pipe 2 is closed and the other end is connected to the exhaust pipe 11. Both ends of the flow control pipes 3 and the outer silencing pipe 1 are closed.

[0046] In this embodiment,

[0047] Backflush tank 8 is used to periodically backflush the inner surface of the membrane tubes in the membrane filtration system to eliminate filter cake and improve filtration efficiency. When backflush tank 8 is replenished, the compressed air inside backflush tank 8 is released through air outlet pipe 13. Air outlet pipe 13 is connected to a noise reduction exhaust pipe, which then extends into the air collection tank 9 and connects to a pressure-reducing and noise-reducing structure. Wherein:

[0048] The noise reduction exhaust pipe includes a flared noise reduction fitting 10, an exhaust pipe 11, and a sound insulation structure 12 wrapped around the outside of the exhaust pipe. The flared noise reduction fitting 10 is a tapered reducer with a gradually increasing pipe diameter. By using the tapered reducer and increasing the pipe diameter, the gas flow rate can be reduced by 60%, which can reduce the noise peak from 90dB to below 75dB. Furthermore, by wrapping the exhaust pipe 11 with the sound insulation structure 12, more than 60% of the main body noise can be blocked, further reducing the noise in the work area by 10-15dB.

[0049] The pressure-reducing and silencing structure includes an inner silencing pipe 2, an outer silencing pipe 1, and at least two stages of flow control pipes 3 positioned between the inner and outer silencing pipes 2 and 1. Flow control holes 7 are created on each pipe using a steel pipe perforation method, forming a diffusion space between adjacent pipes. The design principle is that compressed air entering the pressure-reducing and silencing structure passes through the flow control holes and enters the pressure-reducing body (diffusion space). After a large-volume diffusion and deceleration, it undergoes a second diffusion and deceleration process based on the same principle. Through at least four diffusion and deceleration processes, the compressed air emission velocity is slowed down, resulting in low-pressure gas that is then ejected. During this process, the noise is significantly reduced, lowering the noise of the emitted gas. This technical solution, combined with relevant modifications, can reduce the gas flow velocity of the entire backflushing tank noise reduction pipeline by 85%, greatly reducing noise generation.

[0050] This membrane filtration system's backwash tank noise reduction system is achieved through pipeline modifications and upgrades. Voltage reduction and noise reduction structure This reduces fluid flow rate and solves the problem of excessive noise generated by the backwash tank pipeline in the membrane filtration system, which also affects on-site staff and passersby.

[0051] Furthermore, in this embodiment, the backflushing tank 8 may be provided with an air inlet pipe 14, an air outlet pipe 13, and a liquid inlet pipe 16 at the top, and a liquid outlet pipe 17 at the bottom. The backflushing tank 8 is connected to the membrane filtration system through the liquid outlet pipe 17.

[0052] Furthermore, in this embodiment, a switching valve 15 can be installed on the air inlet pipe 14, the liquid inlet pipe 16, and the liquid outlet pipe 17, and a slow-speed switching valve 18 can be installed on the air outlet pipe 13. Commonly, the valves installed on the upper part of the backflushing tank are fast-switching valves, which release the compressed gas instantly, resulting in excessive gas flow and noise. This invention replaces these valves with slow-speed switching valves, which open slowly, effectively reducing noise.

[0053] Furthermore, in this embodiment, the flared noise reduction pipe fitting 10 can be considered as a stepped flaring structure, including at least two tapered reducers connected in sequence with progressively larger diameters. By using at least two tapered reducers and progressively increasing the pipe diameter, the gas flow velocity inside the pipe can be further reduced.

[0054] Furthermore, in this embodiment, the sound insulation structure 12 can also be considered as sound insulation cotton wrapped around the outside of the exhaust pipe. Wrapping the entire backflushing tank discharge pipe with sound insulation cotton reduces noise generated by excessive flow velocity and fluid scouring of the pipe and bends.

[0055] Furthermore, in this embodiment, the number of flow control tubes 3 can be two, namely a primary flow control tube and a secondary flow control tube. The diameters of the inner silencer tube 2, the primary flow control tube, the secondary flow control tube, and the outer silencer tube 1 increase sequentially. Three diffusion spaces are formed between the inner silencer tube 2, the primary flow control tube, the secondary flow control tube, and the outer silencer tube 1, which are connected to each other through flow control holes 7, namely a secondary diffusion space 4, a tertiary diffusion space 5, and a quaternary diffusion space 6.

[0056] Furthermore, in this embodiment, the inner silencer 2, the primary flow control pipe, the secondary flow control pipe, and the outer silencer 1 are all steel pipes with perforated walls. Considering the strong corrosiveness of the exhaust gas and the high price of customized equipment, the existing steam silencer is replaced with a self-made pressure-reducing silencer structure with small holes. The diameter and number of holes are designed according to the exhaust gas volume. The corrosion-resistant pressure-reducing silencer structure is made by drilling holes in steel pipes. The design principle is that the compressed air entering the pressure-reducing silencer structure enters the pressure-reducing body (diffuser space) after passing through the flow control holes. After one large-volume diffusion and deceleration, it undergoes a second diffusion and deceleration through the same principle. After the above four diffusion and deceleration processes, the exhaust speed of the compressed air can be slowed down, thereby forming a low-pressure gas that is then ejected. During this process, the noise is greatly reduced, thus lowering the noise of the exhaust gas.

[0057] Furthermore, in this embodiment, the gas collection tank 9 may include a sealed tank body and a tank cover. The tank body is also provided with an elastic silencing structure surrounding the pressure-reducing silencing structure. An elastic silencing layer 19 is provided on the side of the elastic silencing structure facing the pressure-reducing silencing structure. The elastic silencing layer 19 may be, but is not limited to, a sponge layer or a honeycomb silencing layer. Further silencing is achieved by adding the elastic silencing layer 19. Example 2

[0058] Embodiment 2 of this utility model is a further improvement on Embodiment 1 in order to fully leverage the technical advantages of the present invention. The following is an illustrative example.

[0059] For example: Figure 8-10 As shown, the elastic silencing structure is a barrel-shaped structure with an open top. A conical inner cavity 20 is formed inside the elastic silencing structure. The pressure-reducing silencing structure is located inside the conical inner cavity 20. An elastic silencing layer 19 with a shape adapted to the inner wall of the conical inner cavity 20 is attached. A conical hole 21 is opened at the bottom of the conical inner cavity 20. The compressed air, after at least four expansion and deceleration cycles, rushes towards the elastic silencing layer 19, which can achieve further silencing. The conical inner cavity helps to collect the liquid mixed in the compressed air and discharge it through the conical hole 21. Example 3

[0060] Embodiment 3 of this utility model is a further improvement on Embodiment 1 in order to fully leverage the technical advantages of the present invention. The following is an illustrative example.

[0061] For example: Figure 11-16 As shown, the elastic noise reduction structure includes a support ring 22 and several noise reduction perforated plates 23. Each noise reduction perforated plate 23 is fixed at a certain angle to the lower end of the support ring 22 and is arranged in a ring array around the central axis of the support ring 22. The pressure reduction noise reduction structure is located within the space surrounded by the noise reduction perforated plates 23. An elastic noise reduction layer 19 with a matching shape is attached to the side of the noise reduction perforated plate 23 facing the pressure reduction noise reduction structure. Compressed air, after at least four expansions and decelerations, rushes towards the elastic noise reduction layer 19. The elastic noise reduction layer 19 surrounds the pressure reduction noise reduction structure, which can achieve further noise reduction.

[0062] The above embodiments have provided a detailed description of the present invention, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made in accordance with the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A backflush tank noise reduction system for a membrane filtration system comprising a backflush tank and a gas collection tank, characterized by: Also includes: The noise-reducing exhaust pipe includes a flared noise-reducing fitting, an exhaust pipe, and a sound insulation structure wrapped around the outside of the exhaust pipe. One end of the exhaust pipe is connected to the outlet pipe of the backflushing tank through the flared noise-reducing fitting, and the other end extends into the gas collection tank. The diameter of the inlet end of the flared noise-reducing fitting is larger than the diameter of the exhaust end. The pressure-reducing and silencing structure is installed inside the gas collection tank. It includes an inner silencing pipe, an outer silencing pipe, and at least two stages of flow control pipes disposed between the inner and outer silencing pipes. The inner silencing pipe, the at least two stages of flow control pipes, and the outer silencing pipe are coaxially arranged from the inside to the outside and have flow control holes evenly distributed on the pipe walls. A diffusion space is formed between adjacent pipes. One end of the inner silencing pipe is closed and the other end is connected to the exhaust pipe. Both ends of the flow control pipe and the outer silencing pipe are closed.

2. A backflush tank noise reduction system for a membrane filtration system according to claim 1, wherein: The backwash tank is equipped with an air inlet pipe, an air outlet pipe, and a liquid inlet pipe at the top, and a liquid outlet pipe at the bottom. The backwash tank is connected to the membrane filtration system through the liquid outlet pipe.

3. A backflush tank noise reduction system for a membrane filtration system according to claim 2, wherein: The air inlet pipe, liquid inlet pipe, and liquid outlet pipe are all equipped with switching valves, and the air outlet pipe is equipped with a slow-speed switching valve.

4. The noise reduction system for a backflush tank of a membrane filtration system of claim 1, wherein: The flared noise-reducing pipe fitting is a tapered reducer with a gradually increasing diameter.

5. The backflush tank noise reduction system for a membrane filtration system of claim 1, wherein: The flared noise reduction pipe fitting has a progressively flared structure, including at least two tapered reducers that are connected sequentially and whose diameters increase sequentially.

6. A backflush tank noise reduction system for a membrane filtration system according to claim 1, wherein: There are two flow control tubes, namely a primary flow control tube and a secondary flow control tube. The diameters of the inner silencer tube, the primary flow control tube, the secondary flow control tube, and the outer silencer tube increase sequentially. The inner silencer tube, the primary flow control tube, the secondary flow control tube, and the outer silencer tube form three diffusion spaces that are interconnected by flow control holes.

7. A backflush tank noise reduction system for a membrane filtration system according to claim 6, wherein: The inner silencing tube, primary flow control tube, secondary flow control tube, and outer silencing tube are all steel pipes with perforated walls.

8. The noise reduction system for a backflush tank of a membrane filtration system of claim 1, wherein: The gas collection tank includes a sealed tank body and a tank cover. The tank body is also provided with an elastic silencing structure surrounding the pressure-reducing and silencing structure. An elastic silencing layer is provided on the side of the elastic silencing structure facing the pressure-reducing and silencing structure.

9. The membrane filtration system backwash tank noise reduction system according to claim 8, characterized in that: The elastic noise reduction structure is a barrel-shaped structure with an open top. A conical inner cavity is formed inside the elastic noise reduction structure. The pressure-reducing noise reduction structure is located inside the conical inner cavity. An elastic noise reduction layer adapted to the shape of the conical inner cavity is attached to the inner wall of the conical inner cavity. A conical hole is opened at the bottom of the conical inner cavity.

10. A backflush tank noise reduction system for a membrane filtration system according to claim 8, wherein: The elastic noise reduction structure includes a support ring and several noise reduction perforated plates. Each noise reduction perforated plate is fixed at a certain angle to the lower end of the support ring and is arranged in a ring array around the central axis of the support ring. The pressure reduction noise reduction structure is located within the space surrounded by the noise reduction perforated plates. An elastic noise reduction layer with a shape adapted to the noise reduction noise reduction structure is attached to the side of the noise reduction perforated plate facing the pressure reduction noise reduction structure.

Images