On-line cleaning device for tubular micro-filtration membrane

Abstract

The utility model provides an on-line cleaning device for a tubular microfiltration membrane, which comprises a rotating plate with a connecting hole, and the rotating plate is provided with a medicament cleaning nozzle, an air cleaning nozzle and a water outlet. The medicament system is connected with the medicament storage tank through a water pump, the gas washing system is communicated with the proportional valve through a gas pump, and the two are linked with the industrial control board through a reversing valve. A servo motor is adopted to drive a gear set, a rotating plate is driven to periodically rotate in a reciprocating mode along a rotating shaft, interference fit and rotary sealing with a membrane assembly are achieved through the design of a step pipe, and the sealing performance of the system is guaranteed through cooperation of an O-shaped ring and a cross check valve. The integrated pressure difference transmitter of the device monitors the pressure difference inside and outside the membrane in real time and triggers an intelligent cleaning program. The servo motor is detachably installed through a hoop / flange, and maintenance is convenient.

Description

An online cleaning device for tubular microfiltration membranes Technical Field

[0001] This utility model relates to the field of membrane filtration equipment technology, specifically to an online cleaning device for tubular microfiltration membranes. Background Technology

[0002] Tubular microfiltration membranes are high-efficiency filtration devices based on membrane technology. Their main working principle involves forming micropores in the membrane tube wall, then using a pressure difference to force liquid through the membrane tube, thereby filtering out suspended solids, bacteria, and other microorganisms. Typically, the micropore size is between 0.1 and 9 μm. In the specific operation, the liquid to be filtered passes through the tubular microfiltration membrane, and the pressure difference isolates suspended solids, bacteria, and other microorganisms on one side of the membrane, while the purified liquid enters the tube through the membrane pores.

[0003] However, during long-term use, contaminants on the surface of tubular microfiltration membranes gradually adhere to and deposit, causing clogging and affecting membrane flux. Traditional solutions include removing the tubular microfiltration membrane from the reaction tank and washing it. However, for environmental engineering, there are many tubular microfiltration membranes, and it is very inconvenient to remove and wash them one by one. This also forces the environmental treatment process to be shut down and wait.

[0004] Therefore, there is an urgent need for an online cleaning device for tubular microfiltration membranes. Summary of the Invention

[0005] The purpose of this invention is to provide an online cleaning device for tubular microfiltration membranes, enabling the tubular microfiltration membranes to complete online cleaning without disassembling the membrane assembly, thereby reducing downtime for environmental treatment.

[0006] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0007] An online cleaning device for a tubular microfiltration membrane includes a rotating plate with a through-hole, and a cleaning agent nozzle, an air cleaning nozzle, and a drain outlet arranged around the outer periphery of the connecting hole.

[0008] The cleaning nozzle is connected to a storage tank and a water pump via a hose.

[0009] The air cleaning nozzle is connected to a proportional valve and an air pump via a hose.

[0010] A rotating shaft is provided inside the connecting hole, a driven gear is provided on the end face of the rotating plate, a drive gear is meshed with the driven paper wheel, the drive gear is provided on the output shaft of the servo motor, the servo motor is electrically connected to the industrial control board, and the water pump and air pump are electrically connected to the industrial control board through a reversing valve.

[0011] Furthermore, the servo motor rotates periodically in both forward and reverse directions, causing the rotating plate to reciprocate along the rotating shaft within a certain angle.

[0012] Furthermore, a stepped tube is provided on the outer edge of the rotating plate. One end of the stepped tube is inserted into the tubular microfiltration membrane and is interference-fitted with it. An annular groove is provided on the inner wall of the other end of the stepped tube, and the rotating plate is rotatably disposed in the annular groove.

[0013] Furthermore, differential pressure transmitters are provided on the inner and outer sides of the membrane module in the tubular microfiltration membrane, and the differential pressure transmitters are electrically connected to the industrial control board.

[0014] Furthermore, one end of the rotating shaft is fixedly installed inside the stepped tube by a bracket, and the other end of the rotating shaft is connected to a clamping plate. The clamping plate is provided with multiple through holes, through which the flexible tube passes.

[0015] Furthermore, the tubular microfiltration membrane and the stepped tube are fixedly connected by bolts.

[0016] Furthermore, the cleaning agent nozzle and / or air cleaning nozzle are equipped with cross-shaped check valves, and O-rings are provided between the rotating plate and the annular groove, and between the connecting hole and the rotating shaft.

[0017] Furthermore, two sets of the chemical cleaning nozzles and / or air cleaning nozzles are provided, with the two chemical cleaning nozzles and / or the two air cleaning nozzles symmetrically arranged along the center of the rotating plate.

[0018] Furthermore, the servo motor is detachably mounted on the outer side of the end of the tubular microfiltration membrane.

[0019] Furthermore, the servo motor can be installed on the tubular microfiltration membrane using one of the following methods: clamp, flange, or snap fastener.

[0020] The advantages and beneficial effects of this utility model are as follows:

[0021] 1. This utility model integrates a chemical cleaning nozzle, an air cleaning nozzle, and a drain outlet through a rotating plate. Combined with a servo motor-driven rotating structure, it can directly clean the membrane module online, avoiding the cumbersome process of traditional disassembly and cleaning, and significantly shortening downtime.

[0022] 2. Differential pressure transmitters on the inside and outside of the membrane module monitor the degree of fouling in real time. When the differential pressure exceeds the threshold, the industrial control board automatically starts the cleaning program to achieve intelligent management. The industrial control board controls the water pump, air pump, and proportional valve through reversing valves to flexibly switch between chemical cleaning and air flushing, or to make the two work intermittently and synchronously to optimize the cleaning process.

[0023] 3. The stepped tube is inserted into the membrane assembly with an interference fit, and the rotating plate is embedded in the annular groove for rotation, ensuring connection stability and preventing liquid leakage through the O-ring seal. The through-hole design of the retaining plate at the end of the rotating shaft facilitates centralized arrangement of hoses, reduces space occupation, and is easy to disassemble for maintenance. Attached Figure Description

[0024] Figure 1 is a cross-sectional structural diagram of this utility model;

[0025] Figure 2 is a schematic diagram of the structure of the rotating plate of this utility model;

[0026] Figure 3 is a structural schematic diagram of the cross-shaped check valve of this utility model;

[0027] In the diagram: 1-Rotating plate, 11-Connecting hole, 12-Medicine cleaning nozzle, 13-Air cleaning nozzle, 14-Drain outlet, 15-Cross-shaped check valve, 16-O-ring seal, 2-Medicine storage tank, 21-Water pump, 3-Proportional valve, 31-Air pump, 4-Rotating shaft, 41-Bracket, 42-Clamping plate, 43-Through hole, 5-Driven gear, 51-Drive gear, 6-Servo motor, 7-Stepped tube, 71-Annular groove, 8-Tube microfiltration membrane, 81-Bolt, 9-Differential pressure transmitter. Detailed Implementation

[0028] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be used to limit the scope of protection of this utility model. Example 1

[0029] As shown in Figures 1 and 2, this embodiment provides an online cleaning device for a tubular microfiltration membrane, including a rotating plate 1, a drug storage tank 2, a water pump 21, a proportional valve 3, an air pump 31, a servo motor 6, and an industrial control board. A connecting hole 11 is provided through the center of the rotating plate 1, and a drug cleaning nozzle 12, an air cleaning nozzle 13, and a drain outlet 14 are distributed circumferentially around the connecting hole 11. The drug cleaning nozzle 12 is connected to the drug storage tank 2 and the water pump 21 via a flexible hose, and the air cleaning nozzle 13 is connected to the proportional valve 3 and the air pump 31 via a flexible hose.

[0030] A driven gear 5 is fixed to the end face of the rotating plate 1, and a drive gear 51 is driven by the output shaft of a servo motor 6, with the two meshing. The servo motor 6 is detachably mounted on the outer side of the end of the tubular microfiltration membrane 8 via a clamp. One end of the stepped tube 7 is inserted into the port of the tubular microfiltration membrane 8 and is interference-fitted, while the inner wall of the other end is provided with an annular groove 71. The rotating plate 1 is embedded in the annular groove 71 via a rotating shaft 4 and fixed by bolts 81. One end of the rotating shaft 4 is fixed inside the stepped tube 7 via a bracket 41, and the other end is connected to a clamping plate 42. The through hole 43 of the clamping plate 42 is used for centralized arrangement of reagents, air, and drainage hoses.

[0031] O-rings 16 are installed between the rotating plate 1 and the annular groove 71, and between the connecting hole 11 and the rotating shaft 4. Cross-shaped check valves 15 are installed at the chemical cleaning nozzle 12 and the air cleaning nozzle 13 to prevent backflow of liquid or gas. Differential pressure transmitters 9 are installed on the inner and outer sides of the tubular microfiltration membrane 8 to monitor the pressure difference across the membrane in real time and are connected to the industrial control board via signal lines. The industrial control board controls the start, stop, and switching of the water pump 21, air pump 31, and proportional valve 3 through reversing valves.

[0032] The working principle of this invention is as follows: when the differential pressure transmitter 9 detects that the pressure difference between the inside and outside of the membrane exceeds a set threshold, such as 0.5 MPa, the industrial control board automatically starts the cleaning program. The industrial control board controls the reversing valve to switch to the chemical pipeline, and starts the water pump 21 to inject the cleaning agent, such as 0.1% sodium hypochlorite solution, from the storage tank 2 into the membrane cavity through the cleaning nozzle 12. At the same time, the servo motor 6 drives the rotating plate 1 to periodically rotate forward and backward at 120°, driving the nozzle to flush the inner wall of the membrane in all directions for 5 minutes. After the chemical cleaning is completed, the reversing valve switches to the air pipeline, and the air pump 31 adjusts the air pressure to 0.3 MPa through the proportional valve 3. Air is sprayed out at high speed through the air cleaning nozzle 13, which, in conjunction with the rotation of the rotating plate 1, removes residual contaminants from the membrane surface for 3 minutes. The waste liquid generated during cleaning is discharged from the system through the drain outlet 14. After cleaning is completed, the servo motor 6 resets, and the industrial control board returns to the filtration mode.

[0033] The cross-shaped check valve 15, also known as a cross-cut check valve, provides a cross-shaped cut to achieve unidirectional flow. When the water pump / air pump is under the same pressure, the cut opens, and after the pressure disappears, the cut closes to prevent air or liquid backflow.

[0034] It should be noted that the pipeline can be made of rubber hose, and a certain amount of allowance is left between the rotating plate and the clamping plate to allow the rotating plate to rotate. Since the diameter of the tubular microfiltration membrane is usually between 10-20 cm, the water pump, air pump, reversing valve, etc. can all be miniature devices, which can be optionally installed on the surface of the clamping plate or integrated into the central control system. Example 2

[0035] Based on Example 1, two sets of symmetrical chemical cleaning nozzles 12 and air cleaning nozzles 13 can be set to improve cleaning uniformity. The rotation angle of the servo motor 6 can be adjusted to ±45°, the speed is 9 rpm, and the cleaning cycle can be dynamically adjusted according to the degree of membrane fouling, such as automatically cleaning once every 7 hours.

[0036] It is worth noting that the reagent may be selected from at least one of dilute hydrochloric acid, citric acid, oxalic acid, sodium hydroxide, sodium hypochlorite, and hydrogen peroxide.

[0037] Through the above embodiments, this invention achieves highly efficient online cleaning of tubular microfiltration membranes without disassembling the membrane assembly, shortening the cleaning cycle to less than 7 minutes, and achieving a membrane flux recovery rate of over 85%. The stepped tube and O-ring design effectively prevents leakage, the detachable installation of the servo motor facilitates maintenance, and the intelligent control of the industrial control board significantly reduces the need for manual intervention.

[0038] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An online cleaning device for tubular microfiltration membranes, characterized in that: The system includes a rotating plate (1), which has a through-hole (11). The outer periphery of the through-hole (11) is provided with a cleaning nozzle (12), an air cleaning nozzle (13), and a drain outlet (14). The cleaning nozzle (12) is connected to a storage tank (2) and a water pump (21) via a hose. The air cleaning nozzle (13) is connected to a proportional valve (3) and an air pump (31) via a hose. A rotating shaft (4) is provided inside the through-hole (11). A driven gear (5) is provided on the end face of the rotating plate (1). The driven gear (5) is meshed with a drive gear (51). The drive gear (51) is located on the output shaft of a servo motor (6). The servo motor (6) is electrically connected to an industrial control board. The water pump (21) and the air pump (31) are electrically connected to the industrial control board via a reversing valve.

2. The online cleaning device according to claim 1, characterized in that: The servo motor (6) rotates periodically in both forward and reverse directions, causing the rotating plate (1) to reciprocate along the rotating shaft (4) within a certain angle.

3. The online cleaning device according to claim 1, characterized in that: The outer edge of the rotating plate (1) is provided with a stepped tube (7). One end of the stepped tube (7) is inserted into the tubular microfiltration membrane (8) and is press-fitted with it. The inner wall of the other end of the stepped tube (7) is provided with an annular groove (71). The rotating plate (1) is rotatably disposed in the annular groove (71).

4. The online cleaning device according to claim 1, characterized in that: Differential pressure transmitters (9) are provided on the inner and outer sides of the membrane module in the tubular microfiltration membrane (8), and the differential pressure transmitters (9) are electrically connected to the industrial control board.

5. The online cleaning device according to claim 1, characterized in that: One end of the rotating shaft (4) is fixedly installed in the stepped tube (7) by a bracket (41), and the other end of the rotating shaft (4) is connected to a clamping plate (42). The clamping plate (42) is provided with multiple through holes (43), and the flexible tube passes through the through holes (43).

6. The online cleaning device according to claim 3, characterized in that: The tubular microfiltration membrane (8) and the stepped tube (7) are fixedly connected by bolts (81).

7. The online cleaning device according to claim 3, characterized in that: The cleaning nozzle (12) and / or the air cleaning nozzle (13) are equipped with cross-shaped check valves (15), and O-rings (16) are provided between the rotating plate (1) and the annular groove (71) and between the connecting hole (11) and the rotating shaft (4).

8. The online cleaning device according to claim 1, characterized in that: The agent cleaning nozzle (12) and / or air cleaning nozzle (13) are provided in two sets, and the two agent cleaning nozzles (12) and / or the two air cleaning nozzles (13) are symmetrically arranged along the center of the rotating plate (1).

9. The online cleaning device according to claim 1, characterized in that: The servo motor (6) is detachably mounted on the outside of the end of the tubular microfiltration membrane (8).

10. The online cleaning device according to claim 9, characterized in that: The servo motor (6) can be installed on the tubular microfiltration membrane (8) in one of the following ways: clamp, flange, or snap fastener.

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