Urban sewage treatment device with in-situ cleaning ultrafiltration membrane assembly

Abstract

The invention discloses an urban sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly, and relates to the field of sewage treatment devices. A municipal sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly comprises a shell provided with a liquid inlet and a liquid outlet, and further comprises a paddle rotationally connected to the liquid inlet, a water inlet, a water outlet, a water inlet, a water outlet, a water inlet and a water outlet, the sliding groove is formed in the shell; the sliding plate is connected into the shell in a sliding mode, and the sliding plate can slide up and down in the shell through impact of the sliding groove and water flow at the liquid inlet; the filter membrane barrel is fixedly connected to the sliding plate, the filter membrane barrel is used for filtering external sewage, and the liquid outlet end of the filter membrane barrel is connected with the liquid outlet; through impact of sewage, the filter membrane barrel continuously moves up and down, impurities left on the surface are cleaned through vibration generated by movement, meanwhile, water flow generated by the first nozzle can conduct secondary cleaning on the impurities on the filter membrane barrel, the filter membrane barrel can effectively clean the sewage, and long-term use is facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment devices, and in particular relates to a municipal sewage treatment device with an in-situ cleaning ultrafiltration membrane component. Background Art

[0002] Ultrafiltration membrane water treatment utilizes the microporous screening function of the ultrafiltration membrane surface to intercept colloids, particles and substances with relatively high molecular weight in the water, thereby achieving the effect of purifying the raw liquid.

[0003] In the current existing technology, ultrafiltration membrane sewage treatment components are divided into plate and frame type, tubular type, roll type and hollow fiber membrane type. The tubular ultrafiltration membrane sewage treatment component is mainly composed of a tank body, an ultrafiltration membrane, a plug and an end cover. The ultrafiltration membrane is arranged in a tubular shape, and one end is sealed and fixed inside the tank body by a plug. The sewage enters from the outside of the tank body and is then filtered by the ultrafiltration membrane. The filtered water is discharged from the unsealed end of the ultrafiltration membrane, thereby completing the filtration treatment of the sewage.

[0004] The existing ultrafiltration membrane is prone to clogging during use, which in turn affects the subsequent filtration effect and is not conducive to the filtration of sewage, especially urban sewage. Despite preliminary filtration and biological treatment, there are still problems of complex composition and a large number of particulate impurities. Therefore, a sewage treatment device with an in-situ cleaning ultrafiltration membrane function is needed for the treatment of urban sewage. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a sewage treatment device that can overcome the above problems or at least partially solve the above problems.

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: an urban sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly, comprising a shell, the shell is provided with a liquid inlet and a liquid outlet, and also includes:

[0007] A paddle, rotatably connected to the liquid inlet;

[0008] A slide groove is arranged in the housing;

[0009] A sliding plate is slidably connected in the shell, and the sliding plate can slide up and down in the shell through the impact of the water flow of the slide groove and the liquid inlet;

[0010] A filter membrane barrel is fixedly connected to the sliding plate, the filter membrane barrel is used to filter external sewage, and the liquid outlet end of the filter membrane barrel is connected to the liquid outlet;

[0011] Multiple groups of piston cylinders are fixedly connected in the housing, the telescopic end of the piston cylinder is against the top of the filter membrane barrel, the liquid inlet end and the liquid outlet end of the piston cylinder are respectively connected to the liquid inlet pipe and the liquid outlet pipe, and the liquid inlet end and the liquid outlet end of the piston cylinder are both connected to a one-way valve;

[0012] An airbag is slidably connected in the shell, the airbag is annularly arranged and sleeved on the filter membrane barrel, the airbag is filled with gas, and the liquid outlet pipe is connected to the airbag;

[0013] Nozzle 1 is connected to the air bag and is used to discharge the liquid in the air bag and guide the liquid to the outside of the filter membrane barrel.

[0014] In order to facilitate cleaning of the outside, further, the airbag is fixedly connected with a drain pipe, the drain pipe is fixedly connected with a ring plate, the ring plate is sleeved on the outside of the filter membrane barrel, and the nozzle is fixedly connected to the ring plate and communicated with the drain pipe.

[0015] In order to facilitate the stable up and down sliding of the airbag, further, an outer cylinder is fixedly connected inside the shell, and an empty groove is provided between the outer cylinder and the shell, and the airbag is slidably connected in the empty groove.

[0016] Furthermore, an inner cylinder is fixedly connected to the outer cylinder, and the inner cylinder is connected to the liquid outlet end of the filter membrane barrel.

[0017] Furthermore, a cavity is provided between the inner cylinder and the outer cylinder, and the piston cylinder is installed in the cavity.

[0018] Furthermore, a filter element is connected to the inner cylinder, and the liquid inlet end of the liquid inlet pipe is located at the liquid outlet end of the filter element.

[0019] Furthermore, a connecting pipe is connected to the liquid outlet end of the filter membrane barrel, and the connecting pipe is connected to the inner cylinder.

[0020] Furthermore, a mounting ring is connected to the liquid inlet end of the inner cylinder, a rotating shaft is fixedly connected to the mounting ring, a rotating plate is fixedly connected to the rotating shaft, and bristles attached to the filter element are fixedly connected to the rotating plate.

[0021] Furthermore, a secondary pipe is fixedly connected to the airbag, and two nozzles are relatively installed on both ends of the rotating plate. The two nozzles are connected to the secondary pipe, and the rotating plate can be rotated by spraying water from the two nozzles.

[0022] In order to reduce the water flow directly rushing towards the airbag and affecting the up and down movement of the airbag, further, an inclined plate is fixedly connected to the shell.

[0023] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0024] The present invention uses the impact of sewage to make the filter membrane barrel move up and down continuously, and cleans the impurities remaining on the surface through the vibration generated by the movement. At the same time, the water flow generated by the nozzle can perform secondary cleaning on the impurities on the filter membrane barrel, which can effectively make the filter membrane barrel clean the sewage and is convenient for long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the three-dimensional structure of a municipal sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly proposed by the present invention Figure 1 ;

[0026] Figure 2 A schematic cross-sectional view of a municipal sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly proposed by the present invention Figure 1 ;

[0027] Figure 3 A schematic cross-sectional view of a municipal sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly proposed by the present invention Figure 2 ;

[0028] Figure 4 A municipal sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly proposed by the present invention Figure 3 The structural diagram of part A in the figure;

[0029] Figure 5 A schematic cross-sectional view of a municipal sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly proposed by the present invention Figure 3 ;

[0030] Figure 6 A municipal sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly proposed by the present invention Figure 5 The structural diagram of part B;

[0031] Figure 7 This is a structural schematic diagram of a mounting plate and a rotating plate in a municipal sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly proposed by the present invention;

[0032] Figure 8 A schematic diagram of the structure of a chute in a municipal sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly proposed by the present invention Figure 1 ;

[0033] Fig. 9 A schematic diagram of the structure of a chute in a municipal sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly proposed by the present invention Figure 2 .

[0034] In the figure: 1. Shell; 101. Liquid inlet; 102. Liquid outlet; 103. Outer cylinder; 104. Inner cylinder; 105. Filter element; 106. Inclined plate; 2. Paddle; 301. Sliding plate; 3011. Connecting rod; 302. Filter membrane barrel; 303. Connecting pipe; 4. Piston cylinder; 401. Liquid outlet pipe; 402. Liquid inlet pipe; 501. Air bag; 502. Drain pipe; 503. Ring plate; 504. Nozzle 1; 505. Auxiliary pipe; 601. Mounting ring; 602. Rotating shaft; 603. Rotating plate; 604. Bristles; 605. Nozzle 2; 7. Slide groove. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0036] Embodiment 1:

[0037] Reference Figure 1-9 , a municipal sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly, comprising a housing 1, on which a liquid inlet 101 and a liquid outlet 102 are arranged, and further comprising: a blade 2, rotatably connected to the liquid inlet 101; a chute 7, arranged in the housing 1; a sliding plate 301, slidably connected in the housing 1, through the impact of the chute 7 and the water flow of the liquid inlet 101, the sliding plate 301 can slide up and down in the housing 1; a filter membrane barrel 302, fixedly connected to the sliding plate 301, the filter membrane barrel 302 is used to filter external sewage, the liquid outlet end of the filter membrane barrel 302 is connected to the liquid outlet 102, wherein the liquid outlet end of the filter membrane barrel 302 is retractable, preferably It is a hose; multiple groups of piston cylinders 4 are fixedly connected in the shell 1, the telescopic end of the piston cylinder 4 is against the top of the filter membrane barrel 302, the liquid inlet end and the liquid outlet end of the piston cylinder 4 are respectively connected with the liquid inlet pipe 402 and the liquid outlet pipe 401, and the liquid inlet end and the liquid outlet end of the piston cylinder 4 are both connected with a one-way valve; an airbag 501 is slidably connected in the shell 1, the airbag 501 is annularly arranged and sleeved on the filter membrane barrel 302, the airbag 501 is filled with gas, and the liquid outlet pipe 401 is connected to the airbag 501; a nozzle 504 is connected to the airbag 501, and the nozzle 504 is used to discharge the liquid in the airbag 501 and guide the liquid to the outside of the filter membrane barrel 302.

[0038] The sliding plate 301 is fixedly connected with a connecting rod 3011. Figure 5 As shown, the sliding plate 301 is inserted into the sliding groove 7, and at this time, it can be ensured that the sliding plate 301 slides stably along the sliding groove 7.

[0039] The slide groove 7 in the present device is a continuous arc shape, such as Figure 8 , Fig. 9As shown, it gradually moves upward, reaches a fixed point, then gradually descends, descends to a low point, and then gradually moves upward, in this way, to achieve a stable cyclic up and down movement of the sliding plate 301 in the housing 1.

[0040] When the device is in use, the liquid inlet 101 is required to be at the bottom and the liquid outlet 102 is required to be at the top, and the sewage is filtered from the bottom to the top. At this time, the liquid outlet end of the urban sewage after preliminary filtration and biological treatment is connected to the liquid inlet 101, and the sewage is pumped into the liquid inlet 101 through a water pump. At this time, as the sewage enters, the sewage will quickly impact the paddle 2, and the paddle 2 will rotate accordingly, causing the sewage to spirally rotate and then impact the sliding plate 301. Then the water will come to the filter membrane on the filter membrane barrel 302, and the sewage will be filtered by dialysis. The filtered water will enter the inside of the filter membrane barrel 302 and finally be discharged through the liquid outlet 102;

[0041] The impact at this time will cause the sliding plate 301 to drive the filter membrane barrel 302 to move upward. Due to the setting of the chute 7, at this time, with the impact of the water flow, the water will cause the filter membrane barrel 302 to continuously move up and down along the chute 7. In order to ensure stable up and down movement, the water entering the liquid inlet 101 can be indirectly increased and decreased, thereby realizing stable up and down movement of the filter membrane barrel 302.

[0042] At this time, the up and down movement of the filter membrane barrel 302 will loosen the sewage impurities remaining on the filter membrane and finally fall off, so that the filter membrane barrel 302 can stably filter the sewage. At the same time, as the filter membrane barrel 302 moves up and down, the piston cylinder 4 will continuously suck the filtered water into the air bag 501. Since there is no water in the shell 1 at the beginning, only gas, the piston cylinder 4 will suck the gas and discharge it into the air bag 501. Since the gas is lighter than water, at this time, it is only necessary to set the nozzle 504 below the air bag 501 to discharge the liquid first. At this time, as the sewage enters, the shell 1 will be filled with When the airbag 501 is full of water and there is gas in the airbag 501, the airbag 501 will float on the water. You only need to set a pressure valve in the nozzle 504, and the airbag 501 will continuously discharge water through the nozzle 504 to clean the surface of the filter barrel 302, effectively avoiding the blockage of the filter membrane. In the state where water and gas coexist in the airbag 501, as the water increases, the airbag 501 will sink in the water. As the water is gradually discharged, the airbag 501 will float. Since the piston cylinder 4 cannot simultaneously perform liquid inlet and outlet, the airbag 501 can be continuously moved up and down to clean the surface of the filter barrel 302.

[0043] Finally, after using for a period of time, the connection between the liquid inlet 101 and the sewage pipe can be disconnected, and the shell 1 can be washed and cleaned to discharge the impurities left by the filtration, so as to avoid too many impurities, causing serious blockage and making it impossible to clean.

[0044] Embodiment 2:

[0045] Reference Figure 1-9 , a municipal sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly, which is basically the same as Example 1, and further: a drain pipe 502 is fixedly connected to the air bag 501, a ring plate 503 is fixedly connected to the drain pipe 502, the ring plate 503 is sleeved on the outside of the filter membrane barrel 302, and a nozzle 504 is fixedly connected to the ring plate 503 and communicated with the drain pipe 502, and an outer cylinder 103 is fixedly connected to the shell 1, wherein as Figure 2 , Figure 3 As shown, the telescopic end of the piston cylinder 4 passes through the outer cylinder 103 and abuts against the filter membrane barrel 302. There is an empty groove between the outer cylinder 103 and the shell 1, and the airbag 501 is slidably connected in the empty groove.

[0046] When the device is in use, the liquid inlet 101 is required to be at the bottom and the liquid outlet 102 is required to be at the top, and the sewage is filtered from the bottom to the top. At this time, the liquid outlet end of the urban sewage after preliminary filtration and biological treatment is connected to the liquid inlet 101, and the sewage is pumped into the liquid inlet 101 through a water pump. At this time, as the sewage enters, the sewage will quickly impact the paddle 2, and the paddle 2 will rotate accordingly, causing the sewage to spirally rotate and then impact the sliding plate 301. Then the water will come to the filter membrane on the filter membrane barrel 302, and the sewage will be filtered by dialysis. The filtered water will enter the inside of the filter membrane barrel 302 and finally be discharged through the liquid outlet 102;

[0047] The impact at this time will cause the sliding plate 301 to drive the filter membrane barrel 302 to move upward. Due to the setting of the chute 7, at this time, with the impact of the water flow, the water will cause the filter membrane barrel 302 to continuously move up and down along the chute 7. In order to ensure stable up and down movement, the water entering the liquid inlet 101 can be indirectly increased and decreased, thereby realizing stable up and down movement of the filter membrane barrel 302.

[0048] At this time, the up and down movement of the filter membrane barrel 302 will loosen the sewage impurities remaining on the filter membrane and finally fall off, so that the filter membrane barrel 302 can stably filter the sewage. At the same time, as the filter membrane barrel 302 moves up and down, the piston cylinder 4 will continuously suck the filtered water into the air bag 501. Since there is no water but only gas in the shell 1 at the beginning, the piston cylinder 4 will suck the gas and discharge it into the air bag 501. Since the gas is lighter than water, at this time, it is only necessary to set the nozzle 504 below the air bag 501 to discharge the liquid first. At this time, as the sewage enters, the shell 1 will be filled with water, and there is gas in the air bag 501. At this time, the air bag 501 will float on the water, and because the ring plate 50 As shown in the figure, two groups are provided, and the nozzle 1 504 is installed on the inner ring of the ring plate 503, so that the surface of the filter barrel 302 can be effectively cleaned. Only a pressure valve is provided in the nozzle 1 504, and the airbag 501 will continuously discharge water through the nozzle 1 504 to clean the surface of the filter barrel 302, effectively avoiding the clogging of the filter membrane. In the state where water and gas coexist in the airbag 501, as the water increases, the airbag 501 will sink in the water, and as the water is gradually discharged, the airbag 501 will float. Since the piston cylinder 4 cannot synchronously perform liquid inlet and outlet, the airbag 501 can be continuously and stably moved up and down in the empty slot, thereby cleaning the surface of the filter barrel 302.

[0049] Embodiment 3:

[0050] Reference Figure 1-9 , a municipal sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly, which is basically the same as Example 2, and further, an inner cylinder 104 is fixedly connected to the outer cylinder 103, the inner cylinder 104 is connected to the liquid outlet end of the filter membrane barrel 302, a cavity is provided between the inner cylinder 104 and the outer cylinder 103, the piston cylinder 4 is installed in the cavity, a filter element 105 is connected to the inner cylinder 104, the liquid inlet end of the liquid inlet pipe 402 is located at the liquid outlet end of the filter element 105, and a connecting pipe 303 is connected to the liquid outlet end of the filter membrane barrel 302, and the connecting pipe 303 is a hose The connecting pipe 303 is connected to the inner cylinder 104, and a mounting ring 601 is connected to the liquid inlet end of the inner cylinder 104. A rotating shaft 602 is fixedly connected to the mounting ring 601, and a rotating plate 603 is fixedly connected to the rotating shaft 602. A brush 604 that is attached to the filter element 105 is fixedly connected to the rotating plate 603. A secondary pipe 505 is fixedly connected to the airbag 501. Nozzle 2 605 is relatively installed on both ends of the rotating plate 603. Nozzle 2 605 is connected to the secondary pipe 505, and the rotating plate 603 can be rotated by spraying water from nozzle 2 605.

[0051] When the device is in use, the liquid inlet 101 is required to be at the bottom and the liquid outlet 102 is required to be at the top, and the sewage is filtered from the bottom to the top. At this time, the liquid outlet end of the urban sewage after preliminary filtration and biological treatment is connected to the liquid inlet 101, and the sewage is pumped into the liquid inlet 101 through a water pump. At this time, as the sewage enters, the sewage will quickly impact the paddle 2, and the paddle 2 will rotate accordingly, causing the sewage to spirally rotate and then impact the sliding plate 301. Then the water will come to the filter membrane on the filter membrane barrel 302, and the sewage will be filtered by dialysis. The filtered water will enter the inside of the filter membrane barrel 302 and finally be discharged through the liquid outlet 102;

[0052] The impact at this time will cause the sliding plate 301 to drive the filter membrane barrel 302 to move upward. Due to the setting of the chute 7, at this time, with the impact of the water flow, the water will cause the filter membrane barrel 302 to continuously move up and down along the chute 7. In order to ensure stable up and down movement, the water entering the liquid inlet 101 can be indirectly increased and decreased, thereby realizing stable up and down movement of the filter membrane barrel 302.

[0053] At this time, the up and down movement of the filter membrane barrel 302 will loosen the sewage impurities remaining on the filter membrane and finally fall off, so that the filter membrane barrel 302 can stably filter the sewage. At the same time, as the filter membrane barrel 302 moves up and down, the piston cylinder 4 will continuously suck the filtered water into the air bag 501. Since there is no water but only gas in the shell 1 at the beginning, the piston cylinder 4 will suck the gas and discharge it into the air bag 501. Since the gas is lighter than water, at this time, it is only necessary to set the nozzle 1 504 below the air bag 501 to discharge the liquid first. At this time, as the sewage enters, the shell 1 will be filled with water, and there is gas in the air bag 501. At this time, the air bag 501 will float on On the water, and since the ring plate 503 is provided with two groups as shown in the figure, the surface of the filter membrane barrel 302 can be effectively cleaned at this time, and it is only necessary to set a pressure valve in the nozzle 1 504, and the air bag 501 will continuously discharge water through the nozzle 1 504 to clean the surface of the filter membrane barrel 302, effectively avoiding the blockage of the filter membrane, and the state of coexistence of water and gas in the air bag 501, as the water increases subsequently, the air bag 501 will sink in the water, and then the water will be gradually discharged, and the air bag 501 will float, because the piston cylinder 4 cannot synchronously perform liquid inlet and outlet, so the air bag 501 can be realized. The continuous and stable movement up and down in the empty slot can achieve the cleaning of the surface of the filter membrane barrel 302.

[0054] At the same time, the filtered water will enter the inner cylinder 104, be filtered twice through the filter element 105, and finally be discharged. At the same time, part of the water that has undergone secondary treatment will enter the piston cylinder 4, and then enter the air bag 501. The water in the air bag 501 will clean the impurities on the filter membrane barrel 302. Part of the water will be discharged through the auxiliary pipe 505 and enter the second nozzle 605, thereby causing the rotating plate 603 to rotate, and the liquid inlet end of the filter element 105 will be cleaned by the bristles 604 for long-term use.

[0055] Embodiment 4:

[0056] Reference Figure 1-5 , a municipal sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly, which is basically the same as Example 3, and further includes: a sloping plate 106 is fixedly connected to the shell 1.

[0057] The arrangement of the inclined plate 106 can prevent water from directly rushing into the air bag 501 , and facilitates the air bag 501 to move up and down in the empty slot, thereby facilitating the cleaning of the filter membrane barrel 302 .

[0058] The present invention uses the impact of sewage to make the filter membrane barrel 302 move up and down continuously, and cleans the impurities remaining on the surface through the vibration generated by the movement. At the same time, the water flow generated by the nozzle 504 can perform secondary cleaning on the impurities on the filter membrane barrel 302, which can effectively clean the sewage of the filter membrane barrel 302 and facilitate long-term use.

[0059] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the present invention can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A municipal sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly, comprising a housing (1), wherein the housing (1) is provided with a liquid inlet (101) and a liquid outlet (102), wherein: Also includes: A paddle (2) rotatably connected to the liquid inlet (101); A slide groove (7) is arranged in the housing (1); A sliding plate (301) is slidably connected in the housing (1), and the sliding plate (301) can slide up and down in the housing (1) through the impact of the water flow in the sliding groove (7) and the liquid inlet (101); A filter membrane barrel (302) is fixedly connected to the sliding plate (301), the filter membrane barrel (302) is used to filter external sewage, and the liquid outlet end of the filter membrane barrel (302) is connected to the liquid outlet (102); A plurality of groups of piston cylinders (4) are fixedly connected in the housing (1), the telescopic ends of the piston cylinders (4) are against the top of the filter membrane barrel (302), the liquid inlet end and the liquid outlet end of the piston cylinder (4) are respectively connected to a liquid inlet pipe (402) and a liquid outlet pipe (401), and the liquid inlet end and the liquid outlet end of the piston cylinder (4) are both connected to a one-way valve; An airbag (501) is slidably connected in the housing (1); the airbag (501) is arranged in an annular shape and sleeved on the filter membrane barrel (302); the airbag (501) is filled with gas; and the liquid outlet pipe (401) is connected to the airbag (501); Nozzle 1 (504) is connected to the air bag (501), and the nozzle 1 (504) is used to discharge the liquid in the air bag (501) and guide the liquid to the outside of the filter membrane barrel (302).

2. The urban sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly according to claim 1, characterized in that: The air bag (501) is fixedly connected to a drain pipe (502), the drain pipe (502) is fixedly connected to a ring plate (503), the ring plate (503) is sleeved on the outside of the filter membrane barrel (302), and the nozzle 1 (504) is fixedly connected to the ring plate (503) and communicates with the drain pipe (502).

3. The urban sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly according to claim 2, characterized in that: An outer cylinder (103) is fixedly connected inside the shell (1), a hollow groove is provided between the outer cylinder (103) and the shell (1), and the airbag (501) is slidably connected in the hollow groove.

4. The urban sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly according to claim 3, characterized in that: The inner cylinder (104) is fixedly connected to the outer cylinder (103), and the inner cylinder (104) is connected to the liquid outlet end of the filter membrane barrel (302).

5. The urban sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly according to claim 4, characterized in that: A cavity is provided between the inner cylinder (104) and the outer cylinder (103), and the piston cylinder (4) is installed in the cavity.

6. The urban sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly according to claim 5, characterized in that: The inner cylinder (104) is connected to a filter element (105), and the liquid inlet end of the liquid inlet pipe (402) is located at the liquid outlet end of the filter element (105).

7. The urban sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly according to claim 4, characterized in that: The liquid outlet end of the filter membrane barrel (302) is connected to a connecting pipe (303), and the connecting pipe (303) is connected to the inner cylinder (104).

8. The urban sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly according to claim 4, characterized in that: The liquid inlet end of the inner cylinder (104) is connected to a mounting ring (601), a rotating shaft (602) is fixedly connected to the mounting ring (601), a rotating plate (603) is fixedly connected to the rotating shaft (602), and bristles (604) that are attached to the filter element (105) are fixedly connected to the rotating plate (603).

9. The urban sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly according to claim 8, characterized in that: The air bag (501) is fixedly connected with a secondary pipe (505), and two nozzles (605) are installed opposite to each other at both ends of the rotating plate (603). The second nozzle (605) is connected to the secondary pipe (505), and the rotating plate (603) can be rotated by spraying water from the second nozzle (605).

10. The urban sewage treatment device with an in-situ cleaning ultrafiltration membrane assembly according to claim 1, characterized in that: An inclined plate (106) is fixedly connected to the housing (1).

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