Bag filter for backwashing MBR (Membrane Bioreactor) membrane tank

Abstract

The utility model relates to a bag filter for backwashing an MBR (Membrane Biological Reactor) membrane tank, which comprises a filter cartridge cover and a filter cartridge body, a plurality of filter elements are arranged in the filter cartridge body, a water inlet is arranged on the side wall of the upper end of the filter cartridge body, a water outlet is arranged on the side wall of the lower end of the filter cartridge body, and a lifting plate is arranged in the filter cartridge body. Vertical through holes are formed in the positions, corresponding to the filter elements, of the lifting plate, the filter elements corresponding to the filter elements can penetrate through the vertical through holes, and brushes used for making contact with the outer surfaces of filter baskets of the filter elements are arranged in the vertical through holes; a cleaning spray head is arranged at the position, corresponding to each filter element, in the filter cartridge cover, and the cleaning spray heads are driven by a lifting assembly to move downwards to the interior of the filter bag of the filter element with the corresponding position. According to the utility model, the cleaning nozzle enters the filter bag and sprays and cleans the filter bag, and the upper brush moves up and down to wash the outer surface of the filter bag, so that the filter element of the bag filter can be effectively cleaned by combining the cleaning nozzle and the upper brush, and the cleaning effect is improved.

Description

Technical Field

[0001] This utility model relates to a bag filter for backwashing MBR membrane tanks. Background Technology

[0002] MBR (Membrane Bioreactor) uses membranes as a carrier to remove pollutants and impurities from wastewater through a combination of biological reactions and physical separation. After a period of operation, the membranes in an MBR tank need backwashing. The backwash water is usually not directly from clean sources like tap water; therefore, it needs to be filtered before backwashing. Currently, bag filters are commonly used to treat MBR backwash water. However, existing bag filters typically consist of filter bags and filter baskets. Over time, a large amount of impurities accumulate on the surfaces of the filter bags and baskets, reducing the filtration rate and affecting filtration quality. Therefore, timely replacement and cleaning of the filter bags are necessary, but frequent removal and cleaning of the filter bags is time-consuming and labor-intensive.

[0003] To address the aforementioned technical problems, some methods employ a cleaning structure within the bag filter, such as the bag filter housing disclosed in Chinese Patent Publication No. CN209005439U. However, this method involves placing spray heads on the outside of the filter basket to clean its outer surface. Since the core filtration element of a bag filter is the filter bag, which is located inside the filter basket, simply spraying and brushing the outer surface of the basket, while effectively cleaning the basket, has minimal effect on the filter bag itself, resulting in an overall unsatisfactory cleaning effect. Utility Model Content

[0004] This utility model addresses the problems existing in the prior art by providing a bag filter for backwashing MBR membrane tanks, which is reasonably designed and facilitates cleaning of the filter element.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a bag filter for backwashing MBR membrane tanks, comprising a filter cylinder body with a filter cylinder cover at the top, a plurality of filter elements disposed inside the filter cylinder body, an inlet disposed on the upper side wall of the filter cylinder body, an outlet disposed on the lower side wall of the filter cylinder body, a lifting plate disposed inside the filter cylinder body, and vertical through holes being provided on the lifting plate at positions corresponding to each filter element, the vertical through holes facilitating the passage of the corresponding filter element, and a brush disposed inside the vertical through holes for contacting the outer surface of the filter basket of the filter element; a cleaning nozzle is disposed inside the filter cylinder cover at a position corresponding to each filter element, the cleaning nozzle being driven downward by the lifting assembly to move into the filter bag of the corresponding filter element.

[0006] Furthermore, the vertical through hole is a circular hole, and the brush is evenly distributed circumferentially on the inner circumferential sidewall of the vertical through hole.

[0007] Furthermore, a first lifting cylinder is vertically arranged below the filter cylinder. The cylinder rod of the first lifting cylinder passes through the bottom of the filter cylinder and extends into the interior of the filter cylinder. The end of the cylinder rod of the first lifting cylinder is connected to the left end of the lifting plate to drive the lifting plate to move up and down.

[0008] Furthermore, the right end of the lifting plate is slidably engaged with a pair of front and rear vertical guide rails, which are installed on the inner wall of the filter cylinder.

[0009] Furthermore, the lifting assembly includes a diversion plate located above the filter cylinder cover. A vertical pipe is connected to the bottom of the diversion plate at a position corresponding to each cleaning nozzle. The vertical pipe slides vertically through the filter cylinder cover, and its bottom is connected to the corresponding cleaning nozzle. The diversion plate is connected to the vertical pipe, and a high-pressure water delivery pipe is connected to its top. A second lifting cylinder is vertically positioned on the right side of the filter cylinder. The cylinder rod of the second lifting cylinder extends upwards, and a lifting connecting plate is fixed to its end. The lifting connecting plate is connected to the right end of the diversion plate, and the second lifting cylinder drives the diversion plate to move up and down via the lifting connecting plate.

[0010] Furthermore, the cleaning nozzle is spherical, and the water outlet holes of the cleaning nozzle are distributed across the entire spherical surface.

[0011] Furthermore, several filter elements are arranged in a matrix.

[0012] Furthermore, a drain port is provided at the bottom of the filter cylinder.

[0013] Compared with the prior art, the present invention has the following advantages: The present invention has a reasonable structural design. It uses a cleaning nozzle to enter the filter bag and spray the filter bag for cleaning. In addition, the brush moves up and down to wash the outer surface of the filter bag. The combination of the two facilitates the effective cleaning of the filter element of the bag filter and improves the cleaning effect. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main structure of an embodiment of this utility model;

[0015] Figure 2 This is a schematic diagram showing the distribution of several filter elements in an embodiment of this utility model. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] like Figures 1-2 As shown, this utility model discloses a bag filter for backwashing an MBR membrane tank, comprising a filter cylinder 1 with a filter cylinder cover 2 on the top. The filter cylinder 1 contains several filter elements 3, each vertically arranged, and includes a filter basket and a filter bag placed within the basket. The upper side wall of the filter cylinder 1 has an inlet 4, and the lower side wall has an outlet 5. These structures are the same as existing bag filters. The specific improvement lies in that a lifting plate 6 is horizontally arranged inside the filter cylinder 1, and the lifting plate 6 connects to the several filter elements. Corresponding to the positions of the filter elements 3, the lifting plate 6 has vertical through holes 7 at positions corresponding to each filter element 3. These vertical through holes 7 allow the corresponding filter element 3 to pass through vertically. Inside each vertical through hole 7 is a brush 8 for contacting the outer surface of the filter basket of the filter element 3. Inside the filter cartridge cover 2, corresponding to the positions of each filter element 3, is a cleaning nozzle 9. The cleaning nozzle 9 is driven downwards by the lifting assembly to the inside of the filter bag of the corresponding filter element 3, and then sprays and cleans the filter bag. By using the cleaning nozzle to enter the filter bag and spray it, combined with the up-and-down movement of the brush to wash the outer surface of the filter bag, the filter elements of the bag filter are effectively cleaned, and the cleaning effect is improved.

[0019] When this bag filter is in operation, backwash water from the MBR membrane tank enters the filter cartridge cover through the inlet, then flows into the filter bag. After being filtered by the filter bag and filter basket, it enters the filter cartridge body and then flows out through the outlet to the membrane in the MBR membrane tank for backwashing. When the bag filter stops filtering, the lifting plate moves up and down, using the brushes in the vertical through-holes to wash the outer surface of the filter basket, while the cleaning nozzles move downwards to enter the filter bag and spray it for cleaning.

[0020] In this embodiment, the vertical through hole 7 is a round hole, and the brushes 8 are evenly distributed on the inner circumferential sidewall of the vertical through hole 7 so as to wash from the periphery of the filter basket and increase the washing range.

[0021] In this embodiment, a first lifting cylinder 10 is vertically arranged below the filter cylinder 1. The cylinder rod of the first lifting cylinder 10 passes through the bottom of the filter cylinder 1 and extends into the interior of the filter cylinder 1. The end of the cylinder rod of the first lifting cylinder 10 is connected to the left end of the lifting plate 6. The first lifting cylinder 10 drives the lifting plate 6 to move up and down.

[0022] In this embodiment, the right end of the lifting plate 6 is slidably engaged with a pair of front and rear vertical guide rails 11, which are installed on the inner wall of the filter cylinder 1. The pair of vertical guide rails guide the up and down movement of the lifting plate, improving the stability of the up and down movement of the lifting plate.

[0023] In this embodiment, the lifting assembly includes a diversion plate 12 disposed above the filter cartridge cover 2. The diversion plate is rectangular and hollow inside. The bottom of the diversion plate 12 is connected to a vertical pipe 13 corresponding to the position of each cleaning nozzle 9. The vertical pipes are rigid pipes. The vertical pipes 13 slide vertically through the filter cartridge cover 2. The bottom of the vertical pipes 13 is connected to the cleaning nozzle 9 at the corresponding position. The diversion plate 12 is connected to the vertical pipes 13. The top of the diversion plate 12 is connected to a high-pressure water delivery pipe 14. The high-pressure water delivery pipe is connected to a high-pressure water source. The high-pressure water delivery pipe sends high-pressure water into the diversion plate. The water in the diversion plate enters each vertical pipe and is then transported to the cleaning nozzle through the vertical pipe. The cleaning nozzle sprays high-pressure water into the filter bag to clean the filter bag.

[0024] In this embodiment, a second lifting cylinder 15 is vertically arranged on the right side of the filter cylinder 1. The cylinder rod of the second lifting cylinder 15 extends upward and is fixed to a lifting connecting plate 16 at its end. The lifting connecting plate 16 is connected to the right end of the diverter plate 12. The second lifting cylinder 15 drives the diverter plate 12 to move up and down through the lifting connecting plate 16. The diverter plate drives the cleaning nozzle to move through a vertical pipe. During operation, when the cleaning nozzle enters the filter bag, the second lifting cylinder can repeatedly extend and retract, thereby driving the cleaning nozzle to move up and down inside the filter bag, realizing spray cleaning of different positions of the filter bag.

[0025] In this embodiment, the cleaning nozzle 9 is spherical, and the water outlet holes of the cleaning nozzle 9 are distributed on the entire spherical surface to increase the spray range of high-pressure water.

[0026] In this embodiment, several filter elements 3 are arranged in a matrix. There can be six filter elements 3, and the six filter elements are arranged in a matrix of two rows and three columns.

[0027] In this embodiment, a drain port 17 is provided at the bottom of the filter cylinder 1 to facilitate drainage.

[0028] It should be noted that a dynamic seal (such as a molded packing seal or a stuffing box seal) is provided between the cylinder rod of the first lifting cylinder and the bottom of the filter cartridge, and a dynamic seal is also provided between the vertical pipe and the filter cartridge cover. The dynamic seal is an existing mature product, and its specific setting is a well-known technology in the field. It mainly serves to prevent water leakage, and its specific structure and setting will not be described in detail here.

[0029] It should be noted that this utility model is a modification of the existing bag filter. The main modifications are the addition of a lifting plate with a brush and a lifting cleaning nozzle. The brush is used to wash the outer surface of the filter basket of the filter element, and the cleaning nozzle is used to spray and clean the inside of the filter bag. The other undisclosed structures related to filtration are the same as those of the existing bag filter, and will not be repeated here.

[0030] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured using a casting process) (except where it is obviously impossible to use an integral molding process).

[0031] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0032] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A bag filter for backwashing an MBR membrane tank, comprising a filter cylinder with a filter cylinder cover at the top, wherein a plurality of filter elements are disposed inside the filter cylinder, an inlet is disposed on the upper side wall of the filter cylinder, and an outlet is disposed on the lower side wall of the filter cylinder, characterized in that: The filter cylinder is equipped with a lifting plate inside. Each filter element has a vertical through hole at its corresponding position. The vertical through hole allows the corresponding filter element to pass through. A brush is installed inside the vertical through hole to contact the outer surface of the filter basket of the filter element. Each filter element has a cleaning nozzle inside its cover. The cleaning nozzle is driven by the lifting assembly to move downwards into the filter bag of the corresponding filter element.

2. A bag filter for backwashing an MBR membrane tank according to claim 1, characterized in that: The vertical through hole is a round hole, and the brush is evenly distributed in a circle on the inner circumference sidewall of the vertical through hole.

3. A bag filter for backwashing an MBR membrane tank according to claim 1, characterized in that: A first lifting cylinder is vertically arranged below the filter cylinder. The cylinder rod of the first lifting cylinder passes through the bottom of the filter cylinder and extends into the interior of the filter cylinder. The end of the cylinder rod of the first lifting cylinder is connected to the left end of the lifting plate to drive the lifting plate to move up and down.

4. A bag filter for backwashing an MBR membrane tank according to claim 3, characterized in that: The right end of the lifting plate is slidably engaged with a pair of front and rear vertical guide rails, which are installed on the inner wall of the filter cylinder.

5. A bag filter for backwashing an MBR membrane tank according to claim 1, characterized in that: The lifting assembly includes a diversion plate located above the filter cylinder cover. A vertical pipe is connected to the bottom of the diversion plate at a position corresponding to each cleaning nozzle. The vertical pipe slides vertically through the filter cylinder cover, and its bottom is connected to the corresponding cleaning nozzle. The diversion plate is connected to the vertical pipe, and a high-pressure water delivery pipe is connected to its top. A second lifting cylinder is vertically positioned on the right side of the filter cylinder. The cylinder rod of the second lifting cylinder extends upwards, and a lifting connecting plate is fixed to its end. The lifting connecting plate is connected to the right end of the diversion plate, and the second lifting cylinder drives the diversion plate to move up and down via the lifting connecting plate.

6. A bag filter for backwashing an MBR membrane tank according to claim 1, characterized in that: The cleaning nozzle is spherical, and the water outlet holes of the cleaning nozzle are distributed across the entire surface of the sphere.

7. A bag filter for backwashing an MBR membrane tank according to claim 1, characterized in that: Several filter elements are arranged in a matrix.

8. A bag filter for backwashing an MBR membrane tank according to claim 1, characterized in that: The bottom of the filter cylinder is provided with a drain port.

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