A multi-filter backwash automatic positioning scraper cleaning filter device

Abstract

This invention discloses a multi-filter cartridge backwashing automatic positioning scraper cleaning filtration device. The scraper is connected to a push rod that penetrates a tank plate containing filter cartridges. The scraper pushes the scraper to scrape the filter cartridges. The filter cartridge comprises a flexible filter membrane and a filter cartridge frame. The flexible filter membrane covers the outside of the filter cartridge frame, forming a cavity with it. The filter cartridge frame has a hollow internal structure. The filter cartridge has a first state and a second state. During normal filtration, the flexible layer of the scraper and the flexible filter membrane do not contact each other, thus maximizing the effective filtration area of ​​the flexible filter membrane and the filter cartridge frame. Under the same filtration accuracy, this device can correct the position of the flexible filter membrane through the filter cartridge frame when scraping the filter cake layer, thus scraping the filter cake very cleanly while minimizing damage to the flexible filter membrane, resulting in a large and stable filtration flow rate.

Description

Technical Field

[0001] This invention relates to the field of liquid filtration, and more particularly to a multi-filter cartridge backflushing automatic positioning scraper cleaning filtration device. Background Technology

[0002] Existing membrane filtration devices generally possess one or two of the following functions: aeration cleaning, fluid flushing, backwashing, and scraper cleaning. However, aeration cleaning, fluid flushing, and backwashing all have certain limitations. After a period of filtration, a layer of intercepted dirt (or filter cake layer, especially some difficult-to-clean sticky dirt) will accumulate on the surface of the membrane filtration device. At this time, aeration cleaning, fluid flushing, and backwashing cannot clean these dirt substances thoroughly. The filtration flow rate of the membrane filtration device will decrease significantly, and the filtration device will not be able to perform normal filtration. Only scraper cleaning can thoroughly clean these dirt substances at this time. Publication number CN 105478016 B provides an automatic backwashing scraper tube membrane filtration device, but this device is a single-layer rigid filter membrane, generally a ceramic tube membrane or a metal sintered tube membrane, and does not have a structure designed with a filter element skeleton to support the flexible filter membrane.

[0003] Currently, scraper cleaning filter devices on the market all have some defects. Due to limitations in machining, the number of tubular membranes cannot be large, generally only about 10. Too many tubular membranes will cause the scraper and the center of the tubular membrane to become misaligned. In this case, either the scraper or the tubular membrane will be damaged, making the membrane filtration device unable to work stably for a long time. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a multi-filter backflushing automatic positioning scraper cleaning filter device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a multi-filter backwash automatic positioning scraper cleaning filter device, comprising:

[0006] scraper;

[0007] A can plate is used to hold filter elements. The scraper is connected to a push rod, which passes through the can plate and pushes the scraper to scrape the filter elements.

[0008] The filter element includes a flexible filter membrane and a filter element skeleton. The flexible filter membrane covers the outside of the filter element skeleton and forms a cavity with the filter element skeleton. The filter element skeleton has a hollow structure inside.

[0009] The filter element includes a first state and a second state. In the first state, the flexible filter membrane is closely attached to the filter element skeleton, forming a double-layer filtration structure with the filter element skeleton. In the second state, the flexible filter membrane and the filter element skeleton form a cavity.

[0010] As a further description of the above technical solution: the scraper is provided with a plurality of scraping holes, and the filter element is disposed in the scraping holes.

[0011] As a further description of the above technical solution: the tank plate is disposed on the filter container, the tank plate has a buffer cavity inside, the buffer cavity has a liquid outlet above it, and the liquid outlet extends to the outside of the filter container and communicates with the outside.

[0012] As a further description of the above technical solution: the flexible filter membrane is cylindrical, with one end face closed and the other end face open, and the open end face penetrates through the tank plate and is connected to the buffer cavity.

[0013] As a further description of the above technical solution: the push rod extends to the outside through the tank plate and is connected to the cylinder, and a sealing ring is provided between the push rod and the tank plate.

[0014] As a further description of the above technical solution: the scraper and the push rod are connected and fixed by multiple nuts, and the position of the scraper can be adjusted.

[0015] As a further description of the above technical solution: the cylinder is provided with a fixed plate, which is connected to the can plate through a lead screw. The position and height of the cylinder can be adjusted by adjusting the position of the fixed plate at the lead screw.

[0016] As a further description of the above technical solution: the bottom of the filter container is provided with a drain port to discharge the filter cake layer dirt cleaned by the scraper after the reaction is completed. The filter container is provided with liquid inlets on both sides to transport the liquid to be filtered into the filter container. The filter container is provided with an aeration pipe that extends through the tank plate to the bottom of the flexible filter membrane.

[0017] As a further description of the above technical solution: the filter element skeleton is provided with multiple protrusions. In the first state, the flexible filter membrane is attached to the filter element skeleton and to the outside of the filter element skeleton, forming a gap with the scraper. In the second state, a cavity is formed between the flexible filter membrane and the filter element skeleton. When the scraper scrapes, the position of the flexible filter membrane can be automatically calibrated.

[0018] As a further description of the above technical solution: the scraper includes a scraper skeleton layer and a scraper flexible layer, and the contact surface between the scraper flexible layer and the flexible filter membrane is a tapered cross section.

[0019] The above technical solution has the following advantages or beneficial effects:

[0020] 1. During normal filtration, the flexible layer of the scraper and the flexible filter membrane do not come into contact, thus maximizing the effective filtration area of ​​the flexible filter membrane and the filter element frame. Under the same filtration accuracy, this device can achieve position correction of the flexible filter membrane through the flexible filter membrane wrapped around the filter element frame when scraping the filter cake layer. Therefore, the filter cake can be scraped very cleanly, and the damage to the flexible filter membrane is minimized, resulting in a large and stable filtration flow rate of the filter element. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the internal structure of the filter container in this invention;

[0022] Figure 2 This is a schematic diagram of the filter element structure in the filtration state of the present invention;

[0023] Figure 3 for Figure 1 A magnified view of point A during the intermediate filtering state;

[0024] Figure 4 This is a schematic diagram of the filter element in the backwashing cleaning state in this invention;

[0025] Figure 5 for Figure 1 A magnified view of point A during the backwashing process;

[0026] Figure 6 This is a partial cross-sectional view of the filter element in the filtration state according to the present invention;

[0027] Figure 7 This is a partial cross-sectional view of the filter element during the backwashing process in this invention.

[0028] Figure 8 This is a partial cross-sectional view of the filter element in the filtration state according to an embodiment of the present invention;

[0029] Figure 9 This is a partial cross-sectional view of the filter element in the backwashing state according to one embodiment of the present invention.

[0030] Figure 10 This is a partial cross-sectional view showing the automatic self-alignment and positioning between the filter element and the scraper during backwashing in one embodiment of the present invention.

[0031] Legend:

[0032] 1. Scraper; 2. Tank plate; 3. Push rod; 4. Flexible filter membrane; 5. Filter element frame; 6. Scraping holes; 7. Filter container; 8. Buffer chamber; 9. Liquid outlet; 10. Cylinder; 11. Fixing plate; 12. Sewage outlet; 13. Liquid inlet; 14. Scraper frame layer; 15. Flexible scraper layer; 16. Aeration pipe; 17. Buffer layer. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Reference Figures 1-4 The present invention provides an embodiment of an automatic positioning scraper cleaning filter device for multi-filter backflushing, comprising: a scraper 1; a tank plate 2 for placing filter elements, the scraper 1 being connected to a push rod 3, the push rod 3 passing through the tank plate 2, and pushing the scraper 1 to scrape the filter elements;

[0035] The filter element includes a flexible filter membrane 4 and a filter element frame 5. The flexible filter membrane 4 covers the outside of the filter element frame 5 and forms a cavity with the filter element frame 5. The filter element frame 5 has a hollow internal structure.

[0036] The filter element includes a first state and a second state. In the first state, the flexible filter membrane 4 is closely attached to the filter element skeleton 5, forming a double-layer filtration structure with the filter element skeleton 5. In the second state, the flexible filter membrane 4 and the filter element skeleton 5 form a cavity.

[0037] The push rod 3 passes through the tank plate 2 and is connected to the scraper 1 below the tank plate 2 by several nuts. The connection between the push rod 3 and the nuts is threaded, which can adjust the position of the scraper 1 on the push rod 3. According to the actual production needs, the position can be adjusted to match the flexible filter membrane 4. In this embodiment, there are four nuts, which are set on the upper and lower sides of the scraper 1, and the positioning can be achieved by the nuts.

[0038] Reference Figures 2-5 When the filter element is in the first state, liquid filtration is performed. The flexible filter membrane 4 is attached to the outside of the filter element skeleton 5, and a gap is created between it and the scraper 1, which increases the contact area between the flexible filter membrane 4 and the liquid to be filtered, thereby increasing the filtration speed. When the filter element is in the second state, backwashing and scraping are performed. The backwash liquid flows outward from the hollow structure inside the filter element skeleton 5, causing the flexible filter membrane 4, which was originally attached to the surface of the filter element skeleton 5, to expand outward, so that the flexible filter membrane 4 comes into contact with the scraper flexible layer 15 in the scraper 1. The pusher 3 pushes the scraper 1 to move up and down, thereby scraping the filter cake layer on the outside of the flexible filter membrane 4.

[0039] Referring to the accompanying drawings, the scraper 1 is provided with a plurality of scraping holes 6, and the filter element is disposed in the scraping holes 6. In this embodiment, the number of filter elements and scraping holes 6 can be selected from 1 to 500, which can realize liquid filtration by multiple filter elements and scraping holes, thereby improving work efficiency.

[0040] Continue to refer to Figure 1 The tank plate 2 is installed on the filter container 7. The tank plate 2 has a buffer cavity 8 inside. The buffer cavity 8 has a liquid outlet 9 above it. The liquid outlet 9 extends to the outside of the filter container 7 and connects with the outside. The flexible filter membrane 4 is cylindrical, with one end closed and the other end open. The open end penetrates the tank plate 2 and connects with the buffer cavity 8.

[0041] A limiting plate is installed on the inner wall of the filter container 7. The tank plate 2 is fixed to the limiting plate with bolts to seal the top of the filter container 7 and prevent the filtrate from overflowing from the top of the filter container 7 during the filtration process. The scraper 1 is provided with several scraping holes and cooperates with the filter element. During the filtration process, the filtrate passes through the flexible filter membrane 4 and the filter element skeleton 5 and moves upward from the hollow structure of the filter element skeleton 5 into the buffer chamber 8. Through the buffer chamber 8, the filtered liquid is concentrated and transported outward from the outlet 9. The buffer chamber 8 can reduce the impact force of the filtered liquid being transported upward.

[0042] Referring to the attached diagram, push rod 3 extends to the outside through tank plate 2 and connects to cylinder 10. A sealing ring is provided between push rod 3 and tank plate 2. The cylinder 10 pushes push rod 3 to move, further driving scraper 1 to move up and down, thereby repeatedly scraping the filter cake layer on the flexible filter membrane 4. A sealing structure, such as a mechanical seal or labyrinth seal, is provided between push rod 3 and tank plate 2 to prevent the filtrate from overflowing upwards during filtration and the backwash liquid from splashing outwards during backwashing.

[0043] The cylinder 10 is equipped with a fixed plate 11, which is connected to the tank plate 2 via a lead screw. By adjusting the position of the fixed plate 11 at the lead screw, the position height of the cylinder 10 can be adjusted. The position height of the fixed plate 11 can be adjusted by adjusting the lead screw, thereby adjusting the stroke range of the push rod 3. This achieves a dual adjustment mechanism for the cylinder 10 and the push rod 3, making the scraping stroke of the scraper 1 more precise and preventing the push rod 3 from traveling too far and leaving the flexible filter membrane 4, thus avoiding damage to the flexible filter membrane 4.

[0044] In this embodiment, the bottom of the filter container 7 is provided with a drain port 12 to discharge the filter cake layer dirt removed by the scraper 1 after the reaction is completed. The filter container 7 is provided with liquid inlets 13 on both sides to transport the liquid to be filtered into the filter container 7. The filter container 7 is provided with an aeration pipe 16 that extends through the tank plate 2 to below the flexible filter membrane 4. The filtered filter cake layer can be discharged from the filter container 7 through the drain port 11. The aeration pipe 16 at the tank plate 2 can transport gas from the aeration pipe 16 to below the flexible filter membrane 4, loosening the filter cake layer through aeration.

[0045] refer to Figures 6-7 The filter element frame 5 has multiple protrusions. In the first state, the flexible filter membrane 4 is attached to the filter element frame 5 and to the outside of the filter element frame 5, forming a gap with the scraper. In the second state, a cavity is formed between the flexible filter membrane 4 and the filter element frame 5. When the scraper 1 scrapes, the position of the filter element frame 5 can be automatically calibrated. In this embodiment, there are six protrusions, which allows the flexible filter membrane 4 to be attached to the filter element frame 5 without reducing the filtration area of ​​the flexible filter membrane 4. In the second state, the cavity formed between the flexible filter membrane 4 and the filter element frame 5 can play a buffering role during backwashing. The filter element frame 5 can serve as a guide rail for the scraper 1 to move, allowing the scraper 1 to move along the direction of the filter element frame 5. The flexible filter membrane 4 is a flexible body and can shift during backwashing. The scraper 1 can automatically position the flexible filter membrane 4 through the filter element frame 5 during scraping.

[0046] Continue to refer to Figure 5 The scraper 1 includes a scraper skeleton layer 14 and a scraper flexible layer 15. The contact surface between the scraper flexible layer 15 and the flexible filter membrane 4 is a tapered cross-section. The scraper flexible layer 15 can scrape off the filter cake layer on the outside of the flexible filter membrane 4. In this embodiment, the material of the scraper flexible layer 15 can be rubber or flexible resin, and the material of the flexible filter membrane 4 is polytetrafluoroethylene (PTFE). The non-stick properties of PTFE can effectively separate sticky dirt.

[0047] Working principle: The cylinder 10 controls the push rod 3 to move the scraper 1 up and down. During filtration, the inlet 13 delivers the liquid to be filtered into the filter container 7, where it is filtered through the flexible filter membrane 4 and the filter element frame 5. During filtration, the filter element is in its first state. The flexible filter membrane 4 is a flexible membrane that can adhere to the surface of the filter element frame 5, creating a gap between the scraper 1 and the flexible filter membrane 4. At the same time, the filter element frame 5 has protrusions to increase the filtration area without reducing the surface area of ​​the flexible filter membrane 4. The filtrate enters the buffer chamber 8 and is delivered from the outlet 9. After filtration, backwashing and scraping of the filter cake layer are performed. The outlet 9 serves as the backwash liquid inlet. The aeration pipe 16 performs aeration cleaning, and the cylinder 10 pushes the scraper 1 up and down. Backflush fluid enters the hollow structure inside the filter element frame 5 and washes against the direction of the flexible filter membrane 4 during filtration. The filter element changes to the second state. The flexible filter membrane 4, which was originally attached to the filter element frame 5, expands outward and forms a cavity with the filter element frame 5. After expansion, the flexible filter membrane 4 adheres to the flexible scraper layer 15. The flexible scraper layer 15 of the scraper 1 scrapes the filter cake layer on the flexible filter membrane 4. At the same time, as the scraper 1 moves up and down, it is guided to move along the direction of the filter element frame 5. The flexible filter membrane 4 leaves the outside of the filter element frame 5 and adheres to the inside of the flexible scraper layer 15. This state automatically adjusts the deviation between the flexible filter membrane 4 and the flexible scraper layer 15, reducing the damage to the flexible filter membrane 4 caused by the flexible scraper layer 15 during the movement of the scraper 1.

[0048] Example 2

[0049] Reference Figures 8-9 In this embodiment, a filter element is provided. A buffer layer 17 is provided between the filter element frame 5 and the flexible filter membrane 4, and is integrally connected with the flexible filter membrane 4. The filter element frame 5 has several drainage holes, which allow backflushing liquid to be quickly output to the flexible filter membrane 4, so that the buffer layer 17 and the flexible filter membrane 4 can be quickly separated from the filter element frame 5. In this embodiment, there are 6 drainage holes in the cross section. The buffer layer 17 is a flexible permeable material. In the first state, the flexible filter membrane 4 and the buffer layer 17 deform and adhere to the outside of the filter element frame 5. In the second state, the flexible filter membrane 4 and the buffer layer 17 expand outward to perform multiple filtrations.

[0050] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-filter backwash automatic positioning scraper cleaning filter device, characterized in that: include: Scraper (1); The can plate (2) is used to place the filter element. The scraper (1) is connected to the push rod (3). The push rod (3) passes through the can plate (2) and pushes the scraper (1) to scrape the filter element. The filter element includes a flexible filter membrane (4) and a filter element frame (5). The flexible filter membrane (4) covers the outside of the filter element frame (5) and forms a cavity with the filter element frame (5). The filter element frame (5) has a hollow structure inside. The filter element includes a first state and a second state. In the first state, the flexible filter membrane (4) is closely attached to the filter element skeleton (5) and forms a double-layer filtration structure with the filter element skeleton (5). In the second state, the flexible filter membrane (4) and the filter element skeleton (5) form a cavity. The filter element frame (5) has multiple protrusions. In the first state, the flexible filter membrane (4) is attached to the filter element frame (5) and attached to the outside of the filter element frame (5), forming a gap with the scraper. In the second state, a cavity is formed between the flexible filter membrane (4) and the filter element frame (5). When the scraper (1) scrapes, the position of the filter element frame (5) can be automatically calibrated. The scraper (1) includes a scraper skeleton layer (14) and a scraper flexible layer (15), and the contact surface between the scraper flexible layer (15) and the flexible filter membrane (4) is a tapered cross section; A buffer layer (17) is provided between the filter element frame (5) and the flexible filter membrane (4), and is integrally connected with the flexible filter membrane (4); In the first state, the flexible filter membrane (4) and the buffer layer (17) deform and adhere to the outside of the filter element skeleton (5). In the second state, the flexible filter membrane (4) and the buffer layer (17) expand outward and perform multiple filtrations.

2. The multi-filter backwash automatic positioning scraper cleaning filter device according to claim 1, characterized in that: The scraper (1) has a plurality of scraping holes (6), and the filter element is disposed in the scraping holes (6).

3. The multi-filter backwash automatic positioning scraper cleaning filter device according to claim 1, characterized in that: The tank plate (2) is installed on the filter container (7). The tank plate (2) has a buffer cavity (8) inside. The buffer cavity (8) has a liquid outlet (9) above it. The liquid outlet (9) extends to the outside of the filter container (7) and communicates with the outside.

4. The multi-filter backwash automatic positioning scraper cleaning filter device according to claim 3, characterized in that: The flexible filter membrane (4) is cylindrical, with one end closed and the other end open. The open end penetrates the tank plate (2) and is connected to the buffer cavity (8).

5. The multi-filter backwash automatic positioning scraper cleaning filter device according to claim 1, characterized in that: The push rod (3) extends to the outside through the tank plate (2) and is connected to the cylinder (10). A sealing ring is provided between the push rod (3) and the tank plate (2).

6. The multi-filter backwash automatic positioning scraper cleaning filter device according to claim 1, characterized in that: The scraper (1) and the push rod (3) are connected and fixed by multiple nuts, and the position of the scraper (1) can be adjusted.

7. The multi-filter backwash automatic positioning scraper cleaning filter device according to claim 5, characterized in that: The cylinder (10) is provided with a fixing plate (11), which is connected to the can plate (2) through a lead screw. The position and height of the cylinder (10) can be adjusted by adjusting the position of the fixing plate (11) at the lead screw.

8. The multi-filter backwash automatic positioning scraper cleaning filter device according to claim 3, characterized in that: The bottom of the filter container (7) is provided with a drain port (12) to discharge the filter cake layer dirt cleaned by the scraper (1) after the reaction is completed. The filter container (7) is provided with liquid inlets (13) on both sides to transport the liquid to be filtered into the filter container (7). The filter container (7) is provided with an aeration pipe (16) that extends through the tank plate (2) to the bottom of the flexible filter membrane (4).

Images