Maintenance system and method for PVDF (Polyvinylidene Fluoride) membrane in water purification treatment

Abstract

The invention relates to a maintenance system and method for a PVDF (Polyvinylidene Fluoride) membrane in water purification treatment. According to the method and the equipment, targeted design is carried out according to the appearance and characteristics of a PVDF membrane filter element, the two ends of the filter membrane are fixed to the head to form a U-shaped structure, the filter membrane can be directly fixed to the arc-shaped telescopic rod in a sleeving mode, and the problem that the physical cleaning effect is poor due to the fact that the filter membrane is not supported and unfolded in place in the physical cleaning process is solved. A filter membrane of a filter element is divided into a conical barrel structure through a plurality of first telescopic rods and arc-shaped telescopic rods, the divided filter membrane is driven by a motor to sequentially pass through a U-shaped cavity with a high-pressure spray head to be flushed on the two faces, and meanwhile, the equipment provides a shower nozzle driven by a telescopic pipe to assist in flushing the middle of the filter element; physical cleaning of the filter element can be achieved at a time, the cleaning efficiency is high, and the cleaning quality is good.

Description

Technical Field

[0001] This invention relates to the field of PVDF membrane maintenance, and in particular to a PVDF membrane maintenance system and method for water purification. Background Technology

[0002] PVDF membrane, short for polyvinylidene fluoride membrane, is a high-performance functional membrane material. Due to its excellent chemical corrosion resistance, high temperature resistance, dimensional stability, and electrical properties, it is widely used in many fields such as ultrafiltration and microfiltration, separation and purification of pharmaceuticals and biological products, gas separation, battery separators, and liquid filtration. Among them, the application of PVDF membrane ultrafiltration and microfiltration is mainly reflected in wastewater treatment and pre-filtration of drinking water. Through its microporous structure, it can effectively remove tiny particles, suspended solids, and organic matter in water, thus improving water quality. In order to maintain the high efficiency of PVDF membrane filtration, the impurities adsorbed on the PVDF membrane need to be cleaned after a period of use. The cleaned PVDF membrane can be reused.

[0003] PVDF membranes are mainly used in applications as cylindrical filter cartridges or filter curtains. Filter curtains are externally mounted and have a simple design, making them easy to clean directly. Filter cartridges are installed inside the filter cylinder, and each cartridge needs to be removed for cleaning. Filter cartridges generally contain multiple circumferentially distributed strands, and each strand contains multiple hollow, thin tubular PVDF membranes. To ensure a more thorough cleaning, the PVDF membranes need to be dispersed as much as possible so that the high-pressure water flow can more directly impact the outer surface of the PVDF membrane. However, in actual operation, the PVDF membranes, which are confined at both ends, are U-shaped. Without support equipment, the PVDF membranes are not easy to disperse and tend to shift and clump together under the rinsing of a high-pressure water gun, thus affecting the rinsing effect and reducing the cleaning efficiency of the PVDF membranes.

[0004] The prior art provides a patent application with application number 202210816711.0 entitled "A PVDF Ultrafiltration Membrane Cleaning Method". This method involves soaking the PVDF membrane in an organic acid solution and a concentrated hydrochloric acid solution, followed by physical cleaning through ultrasonic vibration. This method combines chemical and physical methods to clean the PVDF membrane, which undoubtedly removes stubborn impurities adhering to the PVDF membrane more thoroughly. However, this process is time-consuming, complex, and costly. For PVDF membrane filter elements, the ultrasonic vibration physical cleaning does not spread the PVDF membrane, so the ultrasonic cleaning effect is not ideal. Moreover, ultrasonic cleaning is an immersion cleaning method, and impurities can easily re-adhere after separating from the PVDF membrane, requiring a secondary rinsing process later.

[0005] Existing technologies provide various methods that combine chemical agents with physical methods to achieve deep cleaning of PVDF membranes. Regardless of the chemical agents used, the physical cleaning methods must include at least one of the following: soaking, rinsing, and ultrasonic cleaning. However, if the PVDF membrane cannot be dispersed by any of these physical cleaning methods, the cleaning effect will be greatly reduced. Therefore, this invention provides a physical cleaning method for PVDF membrane filter elements to improve the shortcomings of existing technologies in the physical cleaning of PVDF membrane filter elements. Summary of the Invention

[0006] In view of the above situation and to overcome the defects of the prior art, the present invention provides a maintenance system and method for PVDF membranes in water purification treatment, which effectively solves the problems mentioned in the background art.

[0007] The technical solution to the problem includes a circular water collection tray with a U-shaped cavity installed at an angle inside. Multiple nozzles connected to the U-shaped cavity are evenly distributed on the two inner side walls of the U-shaped cavity. A high-pressure water source is connected to the U-shaped cavity. A sleeve is coaxially rotatably installed above the water collection tray. Multiple first telescopic rods are evenly distributed on the outer circumference of the sleeve. A spring is fitted on the first telescopic rod to allow the telescopic rod to return to its original position and extend outward. An arc-shaped telescopic rod is fixed to the end of each first telescopic rod. Multiple arc-shaped telescopic rods are coaxial. Both the first telescopic rods and the arc-shaped telescopic rods can pass through the U-shaped cavity. A telescopic pipe is coaxially installed inside the water collection tray. A shower head is installed at the upper end of the telescopic pipe. The telescopic pipe is connected to the U-shaped cavity via a pipe.

[0008] Preferably, a U-shaped bracket is provided above the water collection tray, and a motor is fixed at the upper end of the U-shaped bracket. The sleeve is placed below the U-shaped bracket and driven by the motor.

[0009] Preferably, a locking screw is screwed through and screwed onto the sleeve wall, and an annular mounting plate is fixed to the lower end of the sleeve. The annular mounting plate is provided with mounting grooves that correspond one-to-one with the first telescopic rods, and the tail of the first telescopic rod is installed in the corresponding mounting groove.

[0010] Preferably, the telescopic tube is multi-stage and can automatically extend under water pressure.

[0011] Preferably, the water collection tray is equipped with a filter, and a drain valve is connected to the filter.

[0012] A method for using a PVDF membrane maintenance system in water purification includes the following steps: Step 1, filter element pre-installation preparation: Loosen the locking screw to make space inside the sleeve for the head of the filter element to be inserted, press the telescopic tube down and retract it to its shortest state. Step 2, filter element installation: Insert the head of the filter element into the sleeve, adjust the multi-strand filter membrane of the filter element to correspond one-to-one with the multiple first telescopic rods, and fix the head of the filter element with the locking screw; Step 3: Filter membrane spreading and support. Compress the arc-shaped telescopic rod and the first telescopic rod respectively to provide space for each filter membrane to be fitted onto the arc-shaped telescopic rod. After each filter membrane is fitted onto the arc-shaped telescopic rod, extend the arc-shaped telescopic rod and distribute the bending position of each filter membrane on the arc-shaped telescopic rod. After completion, release the first telescopic rod and the spring returns to its original position so that the extended filter membrane is supported. The installation and support of multiple filter membranes are completed in sequence. Step 4, high-pressure rinsing: Turn on the motor to drive the sleeve to rotate the unfolded filter membrane above the water collection tray and make the filter membrane pass through the U-shaped cavity in sequence. Connect the high-pressure water source. The high-pressure water source causes the telescopic tube to be pressurized and extended. The high-pressure water is used to rinse the filter membrane through the nozzle and shower head. Step 5, unloading and replacement: After cleaning, turn off the high-pressure water source and motor, press the telescopic tube to retract it, press the first telescopic rod and the corresponding arc-shaped telescopic rod in sequence to remove the filter membrane from the arc-shaped telescopic rod, loosen the locking screw and remove the filter element from the sleeve, replace it with other filter elements to be cleaned, and filter the sewage in the water collection tray in real time through the filter.

[0013] This invention is specifically designed based on the shape and characteristics of PVDF membrane filter cartridges. The filter membrane is fixed at both ends to the head, forming a U-shaped structure, which can be directly fitted and fixed onto the arc-shaped telescopic rod. This invention improves the poor physical cleaning effect caused by inadequate membrane support and spreading during the physical cleaning process. When applying this method and equipment, the filter cartridge is spread into a conical barrel structure by multiple first telescopic rods and arc-shaped telescopic rods. The spread filter membrane is then sequentially rinsed on both sides through a U-shaped cavity with a high-pressure nozzle under the drive of a motor. Simultaneously, the equipment provides a shower head driven by a telescopic tube to assist in rinsing the middle of the filter cartridge, achieving physical cleaning of the filter cartridge in one pass, resulting in high cleaning efficiency and good cleaning quality. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 This is a top view of the structure of the present invention.

[0016] Figure 3 This is a schematic diagram of the main structure of the present invention.

[0017] Figure 4 This is a cross-sectional view of the U-shaped cavity of the present invention. Detailed Implementation

[0018] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0019] Depend on Figures 1 to 4 As can be seen, the present invention includes a circular water collection tray 1, with a U-shaped cavity 2 installed obliquely inside the water collection tray 1. Multiple nozzles 3 are evenly distributed on the two inner sidewalls of the U-shaped cavity and communicate with it. A high-pressure water source is connected to the U-shaped cavity. A sleeve 4 is coaxially rotatably installed above the water collection tray 1. To facilitate the rotation, installation, and driving of the sleeve 4, a U-shaped bracket 10 is provided above the water collection tray 1. A motor is fixed at the upper end of the U-shaped bracket 10. The sleeve 4 is placed below the U-shaped bracket 10 and driven by the motor. Multiple first telescopic rods 5 are evenly distributed on the outer circumference of the sleeve 4. To fix the filter element inside the sleeve 4 and install the first telescopic rods 5, a locking screw 11 is screwed through and screwed onto the sleeve 4. An annular mounting plate 12 is fixed at the lower end of the sleeve 4. The U-shaped mounting plate 12 has mounting slots corresponding to the first telescopic rods 5. The tail of the first telescopic rod 5 is installed in the corresponding mounting slot. A spring 6 is fitted on the first telescopic rod 5 to allow it to extend outward. An arc-shaped telescopic rod 7 is fixed to the end of each first telescopic rod 5. Multiple arc-shaped telescopic rods 7 are coaxial. Both the first telescopic rods 5 and the arc-shaped telescopic rods 7 can pass through the U-shaped cavity. A telescopic tube 8 is coaxially installed in the water collection tray 1. To facilitate the installation of the filter element, the telescopic tube 8 is multi-stage and can automatically extend under water pressure. A shower head 9 is installed at the upper end of the telescopic tube 8. The telescopic tube 8 is connected to the U-shaped cavity through a pipe. To facilitate the filtration and drainage of the water collection tray 1, a filter is installed in the water collection tray 1, and a drain valve is connected to the filter.

[0020] A method for using a PVDF membrane maintenance system in water purification includes the following steps: Step 1, filter element pre-installation preparation: Loosen the locking screw 11 so that there is space in the sleeve 4 for the head of the filter element to be inserted, press the telescopic tube 8 down and retract it to its shortest state. Step 2, filter element installation: Insert the head of the filter element into the sleeve 4, adjust the multi-strand filter membrane of the filter element to correspond one-to-one with the multiple first telescopic rods 5, and fix the head of the filter element with the locking screw 11. Step 3: Spread and support the filter membranes. Compress the arc-shaped telescopic rod 7 and the first telescopic rod 5 respectively to provide space for each filter membrane to be fitted onto the arc-shaped telescopic rod 7. After each filter membrane is fitted onto the arc-shaped telescopic rod 7, the arc-shaped telescopic rod 7 is stretched and the bending position of each filter membrane is distributed on the arc-shaped telescopic rod 7. After completion, release the first telescopic rod 5 and the spring 6 returns to its original position so that the stretched filter membrane is supported. The installation and support of multiple filter membranes are completed in sequence. Step 4, high-pressure rinsing: Turn on the motor to drive the sleeve 4 to rotate the unfolded filter membrane above the water collection plate 1 and make the filter membrane pass through the U-shaped cavity in sequence. Connect the high-pressure water source, and the high-pressure water source causes the telescopic tube 8 to be pressurized and extended. The high-pressure water is then used to rinse the filter membrane through the nozzle 3 and the shower head 9. Step 5, unloading and replacement: After cleaning, turn off the high-pressure water source and motor, press the telescopic tube 8 to retract it, press the first telescopic rod 5 and the corresponding arc-shaped telescopic rod 7 in sequence to remove the filter membrane from the arc-shaped telescopic rod 7, loosen the locking screw 11 and remove the filter element from the sleeve 4, replace it with other filter elements to be cleaned, and filter the sewage in the water collection tray 1 in real time through the filter.

[0021] The specific working process of this invention: This device is applied to industrial production. The filter elements used in industrial applications are of the same model. Therefore, the first telescopic rod 5 of the corresponding quantity and length is matched according to the model and length of the filter element to meet the production requirements. The number of filter elements and the replacement frequency of industrial filtration meet the conditions for using this equipment.

[0022] The valve on the water collection tray 1 is connected to the sewage treatment system for further secondary recycling of the cleaned water. When using this device, the filter element head is fixed to the sleeve 4 using locking screws 11 to achieve centering and fixation. Therefore, multiple locking screws 11 should be evenly distributed around the circumference to ensure centering of the filter element. When fitting the entire filter membrane onto the arc-shaped telescopic rod 7, first retract the arc-shaped telescopic rod 7 so that the bent portion of the entire filter membrane can be fitted onto the arc-shaped telescopic rod 7, while simultaneously pressing the corresponding first telescopic rod 5. At this time, the spring 6 is compressed. After the entire filter membrane is fitted onto the arc-shaped telescopic rod 7, the arc-shaped telescopic rod 7 is pulled. Multiple arc-shaped telescopic rods 7, when stretched, can form a closed loop, and the filter membrane is spread out on the arc-shaped telescopic rod 7. To facilitate spreading, the first... The first telescopic rod 5 is reset and extended to provide initial support for the filter membrane. After the membrane is spread out, the first telescopic rod 5 is released, and the extended filter membrane is supported by the reset action of the spring 6. After the multiple filter membranes are spread out in sequence, the motor is turned on. Driven by the motor, the spread filter membranes rotate in a conical shape above the water collection tray 1, allowing the spread filter membranes to pass through the U-shaped cavity in sequence. The high-pressure water source is turned on, and the high-pressure water provided by the high-pressure water source passes through the U-shaped cavity and spray nozzle 3 to simultaneously rinse the upper and lower ends of the spread filter membranes. At the same time, under the pressure of the high-pressure water, the telescopic tube 8 is extended, and the high-pressure water passes through the telescopic tube 8 and the shower head 9 to directly rinse the center of the filter element. Driven by the motor, the filter membranes are repeatedly rinsed through the U-shaped cavity, thereby achieving rapid cleaning of the filter element.

[0023] After completion, stop the machine, remove the cleaned filter element and replace it with the remaining filter elements to be cleaned. Repeat the above operation to complete the industrial cleaning of the filter elements.

[0024] The present invention has the following advantages: 1. This invention improves the physical cleaning effect caused by inadequate support and distribution of the filter membrane during the physical cleaning process. When applying this method and equipment, the filter element is distributed into a conical barrel structure by multiple first telescopic rods 5 and arc-shaped telescopic rods 7. The distributed filter membrane is sequentially rinsed on both sides through a U-shaped cavity 2 with a high-pressure nozzle 3 under the drive of a motor. At the same time, this equipment provides a shower head 9 driven by a telescopic tube 8 to assist in rinsing the middle of the filter element. The physical cleaning of the filter element can be achieved in one go, with high cleaning efficiency and good cleaning quality.

[0025] 2. After the filter membrane is spread out and supported, the thin-walled structure of the conical cylinder facilitates direct rinsing by the high-pressure nozzle 3. After being reset and supported by the spring 6, the external structure of the filter membrane is not easily changed or repeatedly accumulated during rinsing or rotation. At the same time, after the filter membrane is spread out and rotated, the upward shower head 9 is directly blocked, preventing the loss of high-pressure water. This makes the structure of the device reasonable and the cleaning efficient.

[0026] 3. This device uses an arc-shaped telescopic rod 7 and a telescopic tube 8, which can be better matched for installation, making the device more convenient and quick to use. At the same time, the structure of this device is simple and efficient, and the production and use costs are low, making it easy to be widely promoted and applied.

[0027] 4. This device and method are specifically designed based on the shape and characteristics of the PVDF membrane filter element. The filter membrane is fixed at both ends to the head, forming a U-shaped structure, which can be directly fitted and fixed on the arc-shaped telescopic rod 7. The filter membrane inside the filter element is distributed in a circular pattern, which provides regularity to the support components of this device. The PVDF membrane filter element structure makes this device and method more convenient and quick to clean such filter elements.

Claims

1. A maintenance system for PVDF membranes in water purification, characterized in that, The device includes a circular water collection tray (1), a U-shaped cavity (2) installed at an angle inside the water collection tray (1), multiple nozzles (3) connected to the U-shaped cavity are evenly distributed on the two inner side walls of the U-shaped cavity, a high-pressure water source is connected to the U-shaped cavity, a sleeve (4) is coaxially rotatably installed above the water collection tray (1), multiple first telescopic rods (5) are evenly distributed on the outer circumference of the sleeve (4), a spring (6) is fitted on the first telescopic rod (5) to allow the telescopic rod to return to its original position and extend outward, an arc-shaped telescopic rod (7) is fixed at the end of each first telescopic rod (5), multiple arc-shaped telescopic rods (7) are coaxial, and the first telescopic rods (5) and the arc-shaped telescopic rods (7) can both pass through the U-shaped cavity, a telescopic pipe (8) is coaxially provided inside the water collection tray (1), a shower head (9) is installed at the upper end of the telescopic pipe (8), and the telescopic pipe (8) is connected to the U-shaped cavity through a pipe.

2. The PVDF membrane maintenance system for water purification according to claim 1, characterized in that, A U-shaped bracket (10) is provided above the water collection tray (1). A motor is fixed at the upper end of the U-shaped bracket (10), and the sleeve (4) is placed below the U-shaped bracket (10) and driven by the motor.

3. The PVDF membrane maintenance system for water purification according to claim 1, characterized in that, A locking screw (11) is screwed through and screwed onto the sleeve (4). An annular mounting plate (12) is fixed to the lower end of the sleeve (4). The annular mounting plate (12) is provided with mounting grooves that correspond one-to-one with the first telescopic rod (5). The tail of the first telescopic rod (5) is installed in the corresponding mounting groove.

4. The PVDF membrane maintenance system for water purification according to claim 1, characterized in that, The telescopic tube (8) is multi-stage and can automatically extend under water pressure.

5. The PVDF membrane maintenance system for water purification according to claim 1, characterized in that, The water collection tray (1) is equipped with a filter, and a drain valve is connected to the filter.

6. A method for using a PVDF membrane maintenance system in water purification, characterized in that, A PVDF membrane maintenance system for water purification, as described in any one of claims 1-5, comprises the following steps: Step 1, filter element pre-installation preparation: Loosen the locking screw (11) so that there is space in the sleeve (4) for the head of the filter element to be inserted; Press the telescopic tube (8) down and retract it to its shortest state. Step 2, filter element installation: insert the head of the filter element into the sleeve (4), adjust the multi-strand filter membrane of the filter element to correspond one-to-one with the multiple first telescopic rods (5), and fix the head of the filter element with the locking screw (11); Step 3: Spread and support the filter membranes. Compress the arc-shaped telescopic rod (7) and the first telescopic rod (5) respectively to provide space for each filter membrane to be fitted onto the arc-shaped telescopic rod (7). After each filter membrane is fitted onto the arc-shaped telescopic rod (7), the arc-shaped telescopic rod (7) is stretched and the bending position of each filter membrane is dispersed on the arc-shaped telescopic rod (7). After completion, release the first telescopic rod (5) and the spring (6) resets so that the stretched filter membrane is supported. The installation and support of multiple filter membranes are completed in sequence. Step 4, high-pressure rinsing: turn on the motor drive sleeve (4) to drive the unfolded filter membrane to rotate above the water collection plate (1) and make the filter membrane pass through the U-shaped cavity in sequence. Connect the high-pressure water source, and the high-pressure water source makes the telescopic tube (8) extend under pressure. The high-pressure water passes through the nozzle (3) and the shower head (9) to rinse the filter membrane. Step 5, unloading and replacement: After cleaning, turn off the high-pressure water source and motor, press the telescopic tube (8) to retract it, press the first telescopic rod (5) and the corresponding arc telescopic rod (7) in sequence to remove the filter membrane from the arc telescopic rod (7), loosen the locking screw (11) and remove the filter element from the sleeve (4), replace it with other filter elements to be cleaned, and filter the sewage in the water collection tray (1) in real time through the filter.

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