An anti-flushing bag filter

Abstract

The present invention relates to the technical field of sewage treatment, and in particular to a backwash bag filter, comprising a cylinder, an upper cover fixedly connected to the top of the cylinder, the upper cover being provided with an exhaust portion, a lower cover fixedly connected to the bottom of the cylinder, the bottom of the lower cover being provided with a drain portion, a filter assembly disposed within the cylinder, a flushing water inlet and a raw water inlet connected to the side wall of the cylinder, the flushing water inlet being located above the raw water inlet, and a water outlet connected to the top of the side wall of the cylinder; and a filter assembly comprising a filter bag fixedly connected to the inner wall of the cylinder. The present invention allows the filter bag to be cleaned without removing it.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, in particular to a backwash bag filter. Background Art

[0002] Bag filters are multi-purpose filtration equipment featuring a novel structure, compact size, simple and flexible operation, energy saving, high efficiency, airtight operation, and strong adaptability. A metal mesh basket supports the filter bag inside the bag filter. Liquid flows in through the raw water inlet, is filtered by the bag, and flows out through the clean water outlet. Impurities are trapped in the bag, and the gradual accumulation of impurities in the bag causes the pressure difference between the raw water inlet and the clean water outlet to increase continuously. When the pressure difference exceeds the bag's tolerance range, the bag must be replaced before continued use.

[0003] Traditional bag filters require replacement of the filter bags before continued use when the pressure differential between the raw water inlet and the purified water outlet reaches a preset value. This not only results in significant bag consumption, but also increases maintenance costs. Replacing the filter bags requires a specific procedure and sequence, and takes a considerable amount of time, reducing work efficiency and consuming manpower and material resources. If the filter bags exceed the pressure they can withstand and are not replaced promptly, there is a risk of bag breakage. A broken bag will affect the purified water after filtration, further impacting the normal operation of the back-end process. Therefore, a backwash bag filter is urgently needed to address this issue. Summary of the Invention

[0004] The object of the present invention is to provide a backwash bag filter to solve the above-mentioned problem and achieve the purpose of cleaning the filter bag without removing the filter bag.

[0005] To achieve the above-mentioned objectives, the present invention provides the following solution: a backwash bag filter, comprising a cylinder, an upper cover fixedly connected to the top of the cylinder, an exhaust portion provided on the upper cover, a lower cover fixedly connected to the bottom of the cylinder, a drainage portion provided at the bottom of the lower cover, a filter assembly provided inside the cylinder, a flushing water inlet portion and a raw water inlet portion connected to the side wall of the cylinder, the flushing water inlet portion being located above the raw water inlet portion, and a water outlet portion being connected to the top of the side wall of the cylinder; the filter assembly comprises a filter bag support, which is fixedly connected to the inner wall of the cylinder.

[0006] Preferably, the flushing water inlet portion includes a flushing water pipe, one end of the flushing water pipe is connected to the top of the cylinder side wall, the other end of the flushing water pipe is connected to the water inlet pipe, a flushing water inlet is provided in the middle of the flushing water pipe, and a flushing water inlet electric ball valve is provided at the top of the flushing water inlet.

[0007] Preferably, the raw water inlet part includes a raw water pipe, one end of the raw water pipe is connected to the bottom of the side wall of the cylinder, the raw water pipe is located below the flushing water pipe, the other end of the raw water pipe is connected to the water inlet pipe, a raw water inlet is provided in the middle of the raw water pipe, and a raw water inlet electric ball valve is provided at the top of the raw water inlet.

[0008] Preferably, a bracket is fixedly connected to the bottom of the filter bag, a compression spring is fixedly connected to the bottom of the bracket, the axis of the compression spring is vertically arranged, a filter bag support is fixedly connected below the compression spring, and the edge of the filter bag support is fixedly connected to the inner wall of the cylinder.

[0009] Preferably, the water outlet includes a clean water outlet, one end of the clean water outlet is connected to the top of the side wall of the cylinder, and a clean water outlet electric ball valve is provided on the top of the clean water outlet.

[0010] Preferably, the exhaust portion includes an exhaust pipe, and the exhaust pipe is connected to the top of the upper cover.

[0011] Preferably, the drainage portion includes a sewage pipe, and the sewage pipe is connected to the bottom of the lower cover.

[0012] Preferably, a hanging ring is fixed to the top of the upper cover.

[0013] Preferably, a plurality of supporting legs are fixedly connected to the bottom of the lower cover.

[0014] The present invention has the following technical effects: the cylinder is used to carry water, the upper cover, the cylinder and the lower cover form a sealing structure to prevent water from leaking, the exhaust part is used to exhaust to prevent the air pressure in the cylinder from being too high, the filter assembly is used to filter the water, remove impurities in the water, and achieve the effect of purifying water, the flushing water inlet part realizes the backwashing effect on the filter bag, flushes away the impurities on the surface of the filter bag and then discharges it through the drainage part, the raw water inlet part can pass the water to be purified into the cylinder, and the water outlet part is used to discharge the purified water. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work.

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] Figure 2 A top view of the present invention;

[0018] Figure 3 It is a schematic diagram of the three-dimensional structure of the present invention;

[0019] Figure 4 Schematic diagram of the inner support structure of the filter bag of the present invention;

[0020] Figure 5 This is a schematic diagram of the filter bag support structure of the present invention;

[0021] Figure 6 This is a structural diagram of embodiment 2 of the present invention;

[0022] Figure 7 For the present invention Figure 6 A partial enlarged view of the middle A;

[0023] Among them, 1. Cylinder; 2. Upper cover; 3. Lower cover; 4. Flushing water inlet; 5. Raw water inlet; 6. Clean water outlet; 7. Water inlet pipe; 8. Exhaust pipe; 9. Lifting ring; 10. Slip bolt; 11. Sewage pipe; 12. Support leg; 13. Electric control box; 14. Electric ball valve for flushing water inlet; 15. Electric ball valve for raw water inlet; 16. Electric ball valve for clean water outlet; 17. Compression spring; 18. Filter bag; 19. Filter bag support; 20. Inner support of filter bag; 21. First limit ring; 22. Outer gear ring; 23. Second limit ring; 24. Gear; 25. Motor. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Example 1

[0027] Reference Figure 1-5 This embodiment provides a backwash bag filter, comprising a cylinder 1. An upper cover 2 is fixedly attached to the top of the cylinder 1, and the upper cover 2 is provided with an exhaust portion. A lower cover 3 is fixedly attached to the bottom of the cylinder 1, and the bottom of the lower cover 3 is provided with a drain portion. A filter assembly is provided within the cylinder 1. A flushing water inlet and a raw water inlet are connected to the side wall of the cylinder 1, with the flushing water inlet being located above the raw water inlet. The top of the side wall of the cylinder 1 is connected to the water outlet. The filter assembly includes a filter bag support 19, which is fixedly attached to the inner wall of the cylinder 1. A filter bag inner support 20 supports the filter bag 18. The filter bag inner support 20 is a hollow shell with a plurality of through holes formed on its surface.

[0028] The cylinder 1 is used to carry water, and the upper cover 2 is fixed to the cylinder 1 by a slipknot bolt 10, which makes it easy to remove the upper cover 2 and take out the filter bag 18. The upper cover 2, the cylinder 1 and the lower cover 3 form a sealing structure to prevent water leakage. The exhaust part is used to exhaust to prevent the air pressure in the cylinder 1 from being too high. The filter assembly is used to filter the water and remove impurities in the water to achieve the effect of purifying water. The flushing water inlet part realizes the backwashing effect on the filter bag 18, flushes away the impurities on the surface of the filter bag 18 and then discharges it through the drainage part. The raw water inlet part can pass the water to be purified into the cylinder 1, and the water outlet part is used to discharge the purified water.

[0029] To further optimize the solution, the flushing water inlet part includes a flushing water pipe, one end of the flushing water pipe is connected to the top of the side wall of the cylinder 1, and the other end of the flushing water pipe is connected to the water inlet pipe 7. A flushing water inlet 4 is provided in the middle of the flushing water pipe, and a flushing water inlet electric ball valve 14 is provided on the top of the flushing water inlet 4.

[0030] To further optimize the solution, the raw water inlet part includes a raw water pipe, one end of the raw water pipe is connected to the bottom of the side wall of the cylinder 1, the raw water pipe is located below the flushing water pipe, the other end of the raw water pipe is connected to the water inlet pipe 7, a raw water inlet 5 is provided in the middle of the raw water pipe, and a raw water inlet electric ball valve 15 is provided on the top of the raw water inlet 5.

[0031] In a further optimized solution, the bottom of the filter bag 18 is fixedly connected to a filter bag inner support 20, and the bottom of the filter bag inner support 20 is fixedly connected to a compression spring 17. The axis of the compression spring 17 is arranged vertically. A filter bag support 19 is fixedly connected below the compression spring 17. The edge of the filter bag support 19 is fixedly connected to the inner wall of the cylinder 1. The arrangement of the filter bag support 19 and the filter bag inner support 20 is conducive to the stability of the filter bag 18.

[0032] To further optimize the solution, the water outlet includes a clean water outlet 6, one end of which is connected to the top of the side wall of the cylinder 1, and a clean water outlet electric ball valve 16 is provided on the top of the clean water outlet 6.

[0033] Further optimizing the solution, the exhaust part includes an exhaust pipe 8, which is connected to the top of the upper cover 2. The exhaust pipe 8 is used to exhaust air to prevent the air pressure in the cylinder 1 from being too high.

[0034] In a further optimized solution, the drainage portion includes a drain pipe 11, which is connected to the bottom of the lower cover 3. The drain pipe 11 is used to discharge the flushing water with impurities.

[0035] To further optimize the solution, a lifting ring 9 is fixed to the top of the upper cover 2. The lifting ring 9 facilitates the lifting of the entire device.

[0036] To further optimize the solution, a plurality of support legs 12 are fixed to the bottom of the lower cover 3. The support legs 12 are used to support the entire device, lift the device off the ground, and are conducive to improving stability.

[0037] The operating process of the present invention is as follows: The device can be switched between filtration mode and backwash mode. An electrical control box 13 is fixedly attached to the side wall of the cylinder 1 and equipped with a control system, which may be a PLC controller. In filtration mode, purified water enters the cylinder 1 from the raw water inlet 5, passes through the filter bag 18, and exits the cylinder 1 from the clean water outlet 6, completing the filtration process. In backwash mode, clean water enters the cylinder 1 from the flushing water inlet 4, flushing impurities from the filter bag 18 from the outside inward. These impurities are washed away and fall to the bottom of the cylinder 1, where they are discharged through the drain pipe 11. The flushing water inlet 4, raw water inlet 5, clean water outlet 6, and drain pipe 11 are controlled by an electric ball valve. When the device is in filtration mode, the flushing water inlet 4 is closed, the raw water inlet 5 is open, the clean water outlet 6 is open, and the drain pipe 11 is closed. When the device is in backwash mode, the flushing water inlet 4 is open, the raw water inlet 5 is closed, the clean water outlet 6 is closed, and the drain pipe 11 is open. The backwash mode automatically activates when the pressure differential between the raw water inlet 5 and the clean water outlet 6 reaches a preset value, allowing the backwash operation to proceed. A pressure differential switch (not shown) is located between the raw water inlet 5 and the clean water outlet 6. The backwash pressure differential value is set on the pressure differential switch based on the filtered water quality and actual operating conditions. When the pressure differential between the raw water inlet 5 and the clean water outlet 6 reaches the set value, the pressure differential switch sends an electrical signal to the control system, activating the electric ball valve and initiating the backwash operation. The use of the device of the present invention improves work efficiency, saves financial and material resources, and facilitates production.

[0038] Example 2

[0039] Reference Figure 6-7 The only difference between this embodiment and embodiment 1 is that the outer wall of the filter bag inner support 20 is rotatably connected to the outer gear ring 22, the top wall of the outer gear ring 22 is fixed to the filter bag 18, the inner wall of the cylinder 1 is fixed to the first limiting ring 21 and the second limiting ring 23, the opposite side walls of the first limiting ring 21 and the second limiting ring 23 are connected to the outer gear ring 22 and are rotatably connected, the top wall of the second limiting ring 23 is fixed to the motor 25, the output shaft of the motor 25 is fixed to the gear 24, and the gear 24 is meshed with the outer gear ring 22. The inner support 20 of the filter bag plays the role of supporting the filter bag 18. The inner support 20 of the filter bag is a hollow shell with a plurality of through holes on its surface. During backwashing, the flushing water passes through the filter bag 18 and flows into the interior of the inner support 20 of the filter bag through the through holes. During the flushing process, the cleaning effect of the parts of the filter bag 18 that are not opposite to the through holes is poor. Therefore, the motor 25 of this embodiment drives the gear 24 to rotate, and the gear 24 drives the filter bag 18 to rotate on the inner support 20 of the filter bag through the outer gear ring 22, so that the parts of the filter bag 18 that are not opposite to the through holes when the filter bag 18 is stationary are in contact with the filter bag 18 through the rotation, thereby enhancing the flushing effect.

[0040] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A backwash bag filter, characterized in that: The invention comprises a cylinder (1), wherein the top of the cylinder (1) is fixedly connected to an upper cover (2), the upper cover (2) is provided with an exhaust portion, the bottom of the cylinder (1) is fixedly connected to a lower cover (3), the bottom of the lower cover (3) is provided with a drainage portion, a filter assembly is provided inside the cylinder (1), a flushing water inlet portion and a raw water inlet portion are connected to the side wall of the cylinder (1), the flushing water inlet portion is located above the raw water inlet portion, and the top of the side wall of the cylinder (1) is connected to the water outlet portion; the filter assembly comprises a filter bag (18), the filter bag (18) is fixedly connected to the inner wall of the cylinder (1), and the bottom of the filter bag (18) is fixedly connected to the filter bag inner support (20); The outer wall of the inner support (20) of the filter bag is rotatably connected to an outer gear ring (22), and the top wall of the outer gear ring (22) is fixedly connected to the filter bag (18). The inner wall of the cylinder (1) is fixedly connected to a first limiting ring (21) and a second limiting ring (23), and the opposite side walls of the first limiting ring (21) and the second limiting ring (23) are rotatably connected to the connection of the outer gear ring (22). The top wall of the second limiting ring (23) is fixedly connected to a motor (25), and the output shaft of the motor (25) is fixedly connected to the outer gear ring (22). There is a gear (24), which is meshed with the outer gear ring (22). The filter bag inner support (20) is a hollow shell with a plurality of through holes on its surface. When backwashing is performed, the flushing water passes through the filter bag (18) and flows into the interior of the filter bag inner support (20) through the through holes. The motor (25) drives the gear (24) to rotate, and the gear (24) drives the filter bag (18) to rotate on the filter bag inner support (20) through the outer gear ring (22).

2. A backwash bag filter according to claim 1, characterized in that: The flushing water inlet portion comprises a flushing water pipe, one end of which is connected to the top of the side wall of the cylinder (1), and the other end of which is connected to a water inlet pipe (7). A flushing water inlet (4) is provided in the middle of the flushing water pipe, and a flushing water inlet electric ball valve (14) is provided at the top of the flushing water inlet (4).

3. A backwash bag filter according to claim 2, characterized in that: The raw water inlet portion comprises a raw water pipe, one end of which is in communication with the bottom of the side wall of the cylinder (1), the raw water pipe is located below the flushing water pipe, the other end of which is in communication with the water inlet pipe (7), a raw water inlet (5) is provided in the middle of the raw water pipe, and a raw water inlet electric ball valve (15) is provided at the top of the raw water inlet (5).

4. The backwash bag filter according to claim 1, characterized in that: A compression spring (17) is fixedly connected to the bottom of the filter bag inner support (20), the axis of the compression spring (17) is vertically arranged, a filter bag support (19) is fixedly connected below the compression spring (17), and the edge of the filter bag support (19) is fixedly connected to the inner wall of the cylinder (1).

5. The backwash bag filter according to claim 1, characterized in that: The water outlet portion comprises a clean water outlet (6), one end of the clean water outlet (6) is in communication with the top of the side wall of the cylinder (1), and a clean water outlet electric ball valve (16) is provided at the top of the clean water outlet (6).

6. The backwash bag filter according to claim 1, characterized in that: The exhaust portion comprises an exhaust pipe (8), and the exhaust pipe (8) is connected to the top of the upper cover (2).

7. The backwash bag filter according to claim 1, characterized in that: The drainage portion comprises a sewage pipe (11), and the sewage pipe (11) is connected to the bottom of the lower cover (3).

8. The backwash bag filter according to claim 1, characterized in that: A hanging ring (9) is fixedly connected to the top of the upper cover (2).

9. The backwash bag filter according to claim 1, characterized in that: A plurality of supporting legs (12) are fixedly connected to the bottom of the lower cover (3).

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