Backwashing device of sewage pump

Abstract

The invention relates to the technical field of sewage pumps, in particular to a sewage pump backwashing device which comprises a sewage pump, a backwashing pipeline, an automatic control system, a monitoring device and a valve, a U-shaped structure is arranged at the bottom of a pump body of the sewage pump, a first electromagnetic valve is arranged on a water pumping pipe of the pump body, and a water outlet of the pump body is connected with the backwashing pipeline. The backwashing pipeline comprises a backwashing water inlet pipe, a tee joint and a sewage pump water outlet pipe, a second electromagnetic valve is arranged on the backwashing water inlet pipe, a third electromagnetic valve is arranged on the sewage pump water outlet pipe, the backwashing water inlet pipe is communicated with the sewage pump water outlet pipe through the tee joint, and a pressure sensor is arranged in the U-shaped structure; and the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the pressure sensor and the monitoring device are in wireless communication connection with the automatic control system. According to the invention, automatic backwashing is realized by virtue of the power of the sewage pump, newly added backwashing power devices are reduced, the labor cost is reduced, and the structure is simple.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage pumps, and particularly to an anti-flushing device for sewage pumps. Background Art

[0002] In the production process of thermal power plants, a large amount of wastewater containing suspended substances and particulate matters such as coal powder and sludge is continuously generated, and sewage pumps are key equipment to ensure the effective discharge of this wastewater and maintain the stable operation of thermal power plants. However, during the continuous operation of sewage pumps, slurry often gradually accumulates at the bottom. If not cleaned in time, this slurry will solidify, resulting in uneven pressure distribution inside the pump body. In the long run, the pump body will face the risk of serious damage.

[0003] Currently, the sewage pump systems of most thermal power plants rely on additional anti-flushing power devices to clean the pump body and related pipelines. This not only significantly increases the cost of equipment purchase and system construction, but also brings additional energy consumption. More importantly, traditional flushing methods often fail to form a strong and uniform flushing water flow, making it difficult to thoroughly remove impurities and dirt inside the pump body. Long-term accumulation will seriously affect the performance and service life of sewage pumps. In addition, if the quality of the flushing water cannot be guaranteed, it may also cause adverse interference to the subsequent drainage treatment process. Even more troublesome is that most current thermal power plants still need to rely on manual regular inspections of the sediment at the pump bottom and manually start the flushing switch. This not only consumes a large amount of human resources, but also may lead to the inability to carry out cleaning work in a timely manner, thereby increasing the risk of pump body damage.

[0004] In view of this, it is of great significance to develop a new type of anti-flushing device for sewage pumps to solve the current problems of sewage pump flushing in thermal power plants. Summary of the Invention

[0005] The object of the present invention is to provide a sewage pump anti-flushing system that can perform automatic anti-flushing relying on its own power, reduce the addition of new anti-flushing power devices, has a simple structure, can achieve the dynamic balance of sewage discharge and anti-flushing, and ensure good water quality after flushing.

[0006] This system can not only significantly reduce equipment costs and system complexity, reduce energy consumption, but also ensure that the pump body is cleaned in a timely and effective manner, thereby extending the service life of sewage pumps and improving the overall operation efficiency. At the same time, this system can also ensure the water quality after flushing, providing strong guarantee for the subsequent drainage treatment process.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A sewage pump backwashing system, comprising a sewage pump, a backwashing pipeline system, an automatic control system, a monitoring device and valves; the sewage pump includes a pump body, a U-shaped structure arranged at the bottom of the pump body, a water inlet and a water outlet; the water inlet is arranged on the upper side wall of the pump body, the water outlet is arranged on the side wall at the connection of the pump body and the U-shaped structure, the water inlet is connected to a drainage ditch through a water suction pipe, the backwashing pipeline includes a backwashing water inlet pipe, a tee joint, and a sewage pump water outlet pipe, the sewage pump water outlet pipe includes a branched water outlet pipe and a main water outlet pipe that are connected and communicated, the water outlet is connected to the branched water outlet pipe; the valves include a first solenoid valve, a second solenoid valve and a third solenoid valve, the first solenoid valve is arranged on the water suction pipe, the backwashing water inlet pipe is communicated with the main water outlet pipe through the tee joint; the second solenoid valve is arranged on the backwashing water inlet pipe, the third solenoid valve is arranged on the main water outlet pipe between the tee joint and the sewage discharge outlet; a pressure sensor is arranged inside the U-shaped structure, and a monitoring device, a filter membrane and an inspection port are sequentially arranged on the main water outlet pipe from the tee joint to the sewage discharge outlet; the automatic control system is wirelessly communicatively connected to the sewage pump, the first solenoid valve, the second solenoid valve, the third solenoid valve, the pressure sensor and the monitoring device.

[0009] Preferably, the automatic control system is a PLC control system or an FCS control system.

[0010] Further, the sewage pump is a rotor pump or a circulation pump.

[0011] Further, a spring moving rod is penetrated through the outer wall of the backwashing water inlet pipe, one end of the spring moving rod is fixedly connected with a magnet, and the other end of the spring moving rod can penetrate into the pipe to control the size of the pipe flow diameter.

[0012] Further, the automatic control system is communicatively connected to the magnet.

[0013] Further, the automatic control system controls the length of the spring moving rod penetrating into the pipe. Specifically, the automatic control system adjusts the suction force on the magnet according to the judged degree of blockage, and then controls the length of the spring moving rod penetrating into the pipe, so as to control the amount of backwashing water.

[0014] Further, the first solenoid valve and the second solenoid valve are not opened simultaneously.

[0015] Further, the pressure spray head is a funnel-shaped structure with a spiral groove inside and a hollow interior, and an impeller is arranged inside the funnel-shaped structure.

[0016] Further, a number of pressure spray nozzles are provided on the circular surface at the upper end of the U-shaped structure. The water outlet includes a first water outlet, a second water outlet and a side water outlet. The first water outlet is communicated with the sewage pump outlet pipe. The second water outlet extends into the U-shaped structure. The pressure spray nozzles are communicated through an annular pipe arranged inside the U-shaped structure. The annular pipe is communicated with the side water outlet through a vertical pipe arranged on the inner side wall of the U-shaped structure.

[0017] Further, a check valve is arranged at the front end of the pressure spray nozzle. The check valve includes a lid and a limit projection that cooperate with each other. The lid is hinged on one side of the front end of the spray orifice of the pressure spray nozzle. The limit projection is fixedly arranged on the other side of the front end of the spray orifice of the pressure spray nozzle.

[0018] Further, a stop valve is arranged at the connection of the vertical pipe and the water outlet; the automatic control system (10) is wirelessly communicatively connected with the stop valve (21).

[0019] Further, the filter membrane is a filter membrane with a pore size of 0.1 to 50 microns. The water flow after flushing is filtered through the filter membrane. It can effectively remove impurities and fine particles in the water, and significantly improve the quality of the discharged water.

[0020] Further, the first solenoid valve, the second solenoid valve and the third solenoid valve are all normally closed solenoid valves.

[0021] Further, multiple sewage pumps are respectively communicated with a main outlet pipe through their respective branch outlet pipes.

[0022] The sewage pump backwashing device controls the forward or reverse operation of the sewage pump through an automatic control system, and controls different solenoid valves to realize the automatic switching between the sewage discharge mode and the backwashing mode, so as to achieve the dynamic balance of sewage discharge and backwashing. That is, during the normal sewage discharge process, the system operates in a conventional manner; when the pressure difference in the pump body reaches a certain value, the backwashing program is automatically started, and after the backwashing is completed, it returns to the normal sewage discharge state, and so on in a cycle.

[0023] Advantages of the present invention:

[0024] (1) Simple structure and energy saving: The sewage pump backwashing system of the present invention relies on the forward and reverse operation of the sewage pump to form a pressure difference to realize backwashing, without the need to additionally set a backwashing power device, reducing the equipment cost and human energy consumption, and at the same time simplifying the system structure.

[0025] (2) Good flushing effect: The pressurized nozzle structure of the present invention not only increases the pressure of the flushing water flow, effectively stripping the sediment at the bottom of the pump, but also the rotatability of the nozzle realizes the comprehensive flushing of the pump bottom. At the same time, the U-shaped structure on the lower side of the pump body makes the flushing water flow form a swirl, which can more comprehensively and effectively flush the inside of the pump, ensuring that impurities and dirt are thoroughly removed, improving the flushing effect, and being beneficial to extending the service life of the sewage pump.

[0026] (3) Guaranteed water quality: The water after flushing is filtered through a filter membrane, which can remove impurities and fine particles in the water, making the discharged water quality good and reducing the impact on subsequent drainage treatment.

[0027] (4) Dynamic balance operation: The present invention realizes the automatic switching between the sewage discharge work and the backwashing work of the sewage pump. Through the pressure detection device and the automatic control system, the dynamic balance of sewage discharge and backwashing is achieved, and the backwashing program can be automatically started according to the actual situation inside the pump, ensuring the stable operation and high-efficiency work of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for description in the embodiments. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 Schematic diagram of the sewage pump backwashing device of the present invention;

[0030] Figure 2 Schematic diagram of the nozzle structure of the present invention;

[0031] Figure 3 Schematic diagram of the connection between the nozzle and the water outlet of the present invention;

[0032] Figure 4 Schematic diagram of the water outlet structure of the present invention.

[0033] Wherein: 1. Pump body, 2. U-shaped structure, 3. Backwashing inlet pipe, 4. Three-way, 6. First solenoid valve, 7. Second solenoid valve, 8. Third solenoid valve, 9. Pressure sensor, 10. Automatic control system, 11. Water inlet, 12. Water outlet, 13. Impeller, 14. Filter membrane, 15. Suction pipe, 16. Pressurized nozzle, 17. Inspection port, 18. Cover body, 19. Limit protrusion, 20. Annular pipe, 21. Stop valve, 22. Vertical pipe, 23. Sewage discharge outlet, 24. Backwashing water inlet, 51. Main outlet pipe, 52. Branch outlet pipe, 121. First water outlet, 122. Second water outlet, 123. Side water outlet. DETAILED DESCRIPTION OF THE INVENTION

[0034] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the protection scope of the present invention.

[0035] It should be noted that all directional indications (such as up, down, left, right, front, back …… ) in the embodiments of the present invention are only used to explain the relative position relationship between components in a specific posture (as shown in the drawings). If this specific posture changes, the directional indications will also change accordingly.

[0036] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly indicate the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one such feature.

[0037] The following will describe in detail the specific embodiments of the present invention with reference to the accompanying drawings.

[0038] The embodiment of the present invention provides a structural schematic diagram of a sewage pump backwashing device. As Figure 1 shown, the sewage pump backwashing device includes: a sewage pump, a backwashing pipeline, an automatic control system 10, a monitoring device, and valves; the sewage pump includes a pump body 1, a U-shaped structure 2 arranged at the bottom of the pump body 1, a water inlet 11, and a water outlet 12; the water inlet 11 is arranged on the upper side wall of the pump body 1, and the water outlet 12 is arranged on the side wall at the connection of the pump body 1 and the U-shaped structure 2; the backwashing pipeline includes a backwashing water inlet pipe 3, a tee 4, and a sewage pump outlet pipe, and the sewage pump outlet pipe includes a branched outlet pipe 52 and a main outlet pipe 51 that are connected; the water inlet 11 is connected to a drainage ditch through a water extraction pipe 15, the water outlet 12 is connected to the branched outlet pipe 52, and the backwashing water inlet pipe 3 is communicated with the main outlet pipe 51 of the sewage pump through the tee 4; the valves include a first solenoid valve 6, a second solenoid valve 7, and a third solenoid valve 8, the first solenoid valve 6 is arranged on the water extraction pipe 15, the second solenoid valve 7 is arranged on the backwashing water inlet pipe 3, and the third solenoid valve 8 is arranged on the main outlet pipe 51 between the tee 4 and the sewage discharge outlet 23; a pressure sensor 9 is arranged in the U-shaped structure 2; the automatic control system is wirelessly communicatively connected to the sewage pump, the first solenoid valve 6, the second solenoid valve 7, the third solenoid valve 8, the pressure sensor 9, and the monitoring device; the sewage pump is a circulation pump.

[0039] The lower side of the pump body 1 is provided with a U-shaped structure 2. When the flushing water flows through the U-shaped structure 2 on the lower side of the pump body 1, a swirling flow can be formed, and this swirling flow can more effectively flush the inner wall of the pump body 1 and related components, which is beneficial to thoroughly flush away impurities and dirt.

[0040] The pressure sensor 9 is used to perform real-time pressure detection on the degree of blockage inside the U-shaped structure 2 on the lower side of the pump body 1. When the lower part of the pump body 1 is blocked and the fluid flow is blocked, the pressure will change. Specifically, the pressure in the upper part of the pump body 1 (i.e., upstream of the blockage point at the bottom of the pump) will increase, while the pressure on the side of the water outlet 12 of the pump body 1 (i.e., downstream of the blockage point) will decrease. The automatic control system analyzes the pressure value data of the upstream and downstream of the blockage at the bottom of the pump body collected by the pressure sensor to judge whether a blockage occurs and the approximate degree of the blockage. When the pressure difference between the upper part of the pump body 1 and the side of the water outlet 12 of the pump body 1 in the pump body 1 reaches the preset starting backwashing pressure value, the pressure sensor transmits a signal to the automatic control system 10, and the automatic control system 10 controls the sewage pump to change the running direction and start the backwashing process. Specifically, the automatic control system 10 controls the first solenoid valve 6 to close, the third solenoid valve 8 to close, and the second solenoid valve 7 to open. Under the action of the self-power of the sewage pump, the backwashing water flows through the backwashing inlet pipe 3, the main outlet pipe 51, and the outlet pipe 52 all the way, and flows into the upper part of the flushing U-shaped through the second water outlet 122; at the same time, the automatic control system 10 controls the stop valve 21 to open, and the other part of the backwashing water flows in from the side water outlet 123, flows through the vertical pipe 22, and is introduced into the annular pipe 20, and is pressurized by the pressurizing nozzle 16 to wash the middle and bottom of the pump body 1. The flushing water forms a swirling flow in the U-shaped structure 2 to effectively wash the inner wall of the bottom of the pump body 1; when the pressure sensor 9 detects that the pressure at the bottom of the pump body 1 is greater than the preset starting pressure value for discharging the backwashing water, the automatic control system 10 controls the third solenoid valve 8 to open, the stop valve 21 to close, and the sewage pump rotates forward, and flushes the sediment sewage from the second water outlet 122 to the first water outlet 121, through the branch outlet pipe 52 and the main outlet pipe 51, and finally discharges it from the sewage discharge port 23.

[0041] A monitoring device, a filter membrane 14, and an inspection port 17 are sequentially arranged on the main outlet pipe 51 between the tee 4 and the backwashing water inlet 24. The monitoring device can monitor the blockage conditions of the outlet pipe and the filter membrane 14 in real time, and the staff takes out the filter membrane 14 through the inspection port 17 for flushing. The monitoring device adopts a pipeline blockage detector, a pipeline endoscope, etc. in the prior art.

[0042] In the preferred embodiment provided by the present invention, as Figure 3 and 4As shown in the figure, four pressure nozzles 16 are evenly arranged on the circumferential surface at the upper end of the U-shaped structure 2 at the bottom of the pump body 1. An annular pipe 20 recessed in the U-shaped structure 2 is arranged on this circumferential surface. The water outlet is composed of a first water outlet 121, a second water outlet 122 and a side water outlet 123. The first water outlet 121 is communicated with the branch outlet pipe 52 of the sewage pump. The second water outlet 122 extends into the U-shaped structure 2. The pressure nozzles 16 are communicated through the annular pipe 20. The annular pipe 20 is communicated with the side water outlet 123 through a vertical pipe 22 arranged on the inner side wall of the U-shaped structure 2. As Figure 2 shown, the pressure nozzle 16 is a funnel-shaped structure with a hollow interior and spiral grooves. An impeller 13 is arranged inside the funnel-shaped structure. The pressure nozzle 16 is wirelessly communicatively connected with the automatic control system 10; the cover body 18 is hinged on the upper side of the front end of the nozzle of the pressure nozzle 16, and a limit protrusion 19 is fixedly arranged on the lower side of the front end of the nozzle of the pressure nozzle 16; the side water outlet 123 and the vertical pipe 22 are connected through a stop valve 21, and the cover body 18 cooperates with the limit protrusion 19.

[0043] During backwashing, the backwashing water flow rushes out from the nozzle of the pressure nozzle 16, and the cover body 18 is opened under the impact of the water flow; when the sewage pump is discharging sewage normally, the cover body 18 closes the nozzle of the pressure nozzle 16 under the limitation of the limit protrusion 19.

[0044] During backwashing, the backwashing water flow can flow from the side water outlet 123 through the stop valve 21 and into the annular pipe 20 through the vertical pipe 22; under the limitation of the stop valve 21, the washed water flow and the normal sewage discharge water flow cannot flow into the annular pipe 20.

[0045] When the backwashing water flow enters the pressure nozzle 16, under the guidance of the spiral grooves, the water flow flows along a specific path, increasing the flow velocity of the water flow; at the same time, the water flow is further accelerated by the rotation of the impeller 13, forming a water flow impact force along the tangential direction of the outlet of the pressure nozzle 16, so that the water flow forms a scraping force on the surface of the U-shaped structure 2, thereby effectively washing away the sediments in the U-shaped structure 2 at the bottom of the pump. The rotatability of the pressure nozzle 16 enables it to adjust the direction and angle of the water flow, thereby realizing the comprehensive washing of the U-shaped structure 2.

[0046] In the embodiment provided by the present invention, the first solenoid valve 6, the second solenoid valve 7 and the third solenoid valve 8 can be replaced by an electric valve, a pneumatic valve, etc.

[0047] In the embodiment provided by the present invention, the automatic control system 10 can be selected from a PLC control system or an FCS control system.

[0048] In the preferred embodiment provided by the present invention, when the pipeline plug detector or pipeline endoscope provided on the pipe wall of the total outlet pipe 51 of the sewage pump detects that the blockage of the outlet pipe reaches the set value, the automatic control system 10 will alarm to notify the staff. The staff can take out the filter membrane 14 through the inspection port for flushing, and then install the filter membrane 14 into the total outlet pipe 51. In the preferred embodiment provided by the present invention, a microfiltration membrane with a pore size of 20 microns is clamped on the inner wall of the total outlet pipe 51 of the sewage pump. An inspection port 17 is opened on the upper side of the pipe wall of the total outlet pipe 51 of the sewage pump where the microfiltration membrane is clamped. A pipeline plug detector is provided on the pipe wall of the total outlet pipe 51 of the sewage pump, and the probe of the pipeline plug detector extends into the outlet pipe of the sewage pump. The filter membrane 14 adopts a 30-micron filter membrane. The pipeline plug detector, the filter membrane 14, and the inspection port 17 are sequentially arranged on the total outlet pipe 51 between the tee 4 and the sewage discharge port 23; the flushed water is filtered through the filter membrane 14. It can effectively remove impurities and fine particles in the water, and significantly improve the discharged water quality.

[0049] The specific working process of the sewage pump backwashing device is as follows:

[0050] (1) Normal sewage discharge process

[0051] When the pressure sensor 9 detects that the pressure difference between the pressure on the upper part of the pump body 1 (i.e., upstream of the blockage point at the bottom of the pump) and the pressure on the outlet 12 of the pump body 1 (i.e., downstream of the blockage point at the bottom of the pump) is less than the preset starting backwashing pressure value P1, the sewage pump backwashing device normally discharges sewage. Specifically, the automatic control system 10 controls the first solenoid valve 6 to open, the third solenoid valve 8 to open, the second solenoid valve 7 to close, and controls the stop valve 21 to close. The sewage pump rotates forward, and the sewage pump pumps sewage from the drainage ditch, flows through the second outlet 122 and the first outlet 121, through the branch outlet pipe 52 and the total outlet pipe 51, and is discharged from the sewage discharge port 23.

[0052] (2) Backwashing process

[0053] When the pressure sensor 9 detects that the pressure difference between the upper part of the pump body 1 and the pressure measured at the water outlet 12 of the pump body 1 is greater than or equal to the preset starting backwashing pressure value P1, the automatic control system 10 controls the first solenoid valve 6 to close, the third solenoid valve 8 to close, and the second solenoid valve 7 to open. The sewage pump rotates in the reverse direction, and the backwashing water enters from the backwashing water inlet 24. One way is through the backwashing water inlet pipe 3, flowing through the main outlet pipe 51 and the branch outlet pipe 52, and flowing into the upper part of the flushing U-shaped from the second water outlet 122. The automatic control system 10 controls the stop valve 21 to open. The other way of the backwashing water flows in from the side water outlet 123, flows through the vertical pipe 22, and is introduced into the annular pipe 20. After being pressurized by the pressurized spray head 16, it flushes the middle and bottom parts of the pump body 1. The flushing water flow forms a swirl in the U-shaped structure 2, effectively flushing the inner wall of the bottom of the pump body 1. When the pressure sensor 9 detects that the pressure difference at the bottom of the pump body 1 is greater than the preset starting pressure value P2 for discharging the backwashing water, the automatic control system 10 controls the third solenoid valve 8 to open, the stop valve 21 to close, and the sewage pump rotates in the forward direction, scouring the sediment-laden sewage from the second water outlet 122 to the first water outlet 121, through the branch outlet pipe 52 and the main outlet pipe 51, and finally discharging it from the sewage discharge outlet 23.

[0054] (3) Normal sewage discharge process in a cycle

[0055] When the pressure sensor 9 detects again that the pressure difference between the upper part of the pump body 1 and the pressure on the side of the water outlet 12 of the pump body 1 is less than the preset starting backwashing pressure value P1, the automatic control system 10 controls the first solenoid valve 6 to open. At this time, the sewage pump is in the forward rotation state. The sewage pump pumps sewage from the drainage ditch, and the sewage flows through the second water outlet 122, the first water outlet 121, through the branch outlet pipe 52 and the main outlet pipe 51, and is discharged from the sewage discharge outlet 23.

[0056] The above normal sewage discharge process and backwashing process are controlled by the automatic control system 10 to cycle, realizing the dynamic balance of sewage discharge and backwashing.

[0057] (4) Water outlet filtration and filter membrane flushing

[0058] The backwashing water intercepts impurities and fine particles in the water through the filter membrane 14 arranged in the main outlet pipe 51 of the sewage pump, purifying the discharged water quality.

[0059] When the pipeline blockage detector or pipeline endoscope arranged on the wall of the main outlet pipe 51 of the sewage pump detects that the filter membrane 14 is blocked up to the set value, the automatic control system 10 will alarm to notify the staff. The staff can take out the filter membrane 14 through the inspection port 17 for flushing, and then install the filter membrane 14 into the main outlet pipe 51 of the sewage pump.

[0060] The present invention has been further described above by means of specific embodiments. However, it should be understood that the specific description herein should not be construed as a limitation on the essence and scope of the present invention. Various modifications made by those of ordinary skill in the art to the above embodiments after reading this specification all fall within the scope protected by the present invention.

Claims

1. A sewage pump backwashing device, characterized in that, It includes a sewage pump, a backwash pipeline, an automatic control system (10), a monitoring device and valves; The sewage pump includes a pump body, a U-shaped structure arranged at the bottom of the pump body, a water inlet and a water outlet; the water inlet (11) is arranged on the upper side wall of the pump body, and the water outlet is arranged on the side wall at the connection of the pump body and the U-shaped structure; The backwash pipeline includes a backwash water inlet pipe, a tee joint, and a sewage pump outlet pipe; the sewage pump outlet pipe includes a branched outlet pipe and a main outlet pipe that are connected and communicated. The water inlet is connected to a drainage ditch through a suction pipe, and the water outlet is connected to the branched outlet pipe; The valves include a first solenoid valve, a second solenoid valve, and a third solenoid valve. The first solenoid valve is arranged on the suction pipe. The backwash water inlet pipe is communicated with the main outlet pipe through the tee joint. The tee joint is arranged on the main outlet pipe between the connection of the branched outlet pipe and the main outlet pipe and the sewage discharge outlet; the second solenoid valve is arranged on the backwash water inlet pipe, and the third solenoid valve is arranged on the main outlet pipe between the tee joint and the sewage discharge outlet; A pressure sensor is arranged inside the U-shaped structure, and a monitoring device, a filter membrane, and an inspection port are sequentially arranged on the main outlet pipe from the tee joint to the sewage discharge outlet; The automatic control system is wirelessly communicatively connected to the sewage pump, the first solenoid valve, the second solenoid valve, the third solenoid valve, the pressure sensor, and the monitoring device.

2. The sewage pump backwashing device according to claim 1, characterized in that, The sewage pump adopts a rotary pump or a circulation pump.

3. The sewage pump backwashing device according to claim 1, characterized in that, A spring moving stop rod is penetrated and arranged on the outer wall of the backwash water inlet pipe. One end of the spring moving stop rod is fixedly connected to a magnet, and the other end of the spring moving stop rod extends into the pipeline.

4. The sewage pump backwashing device according to claim 3, characterized in that, The automatic control system is communicatively connected to the magnet.

5. The sewage pump backwashing device according to claim 1, characterized in that, A plurality of pressure spray nozzles are arranged on the circular surface at the upper end of the U-shaped structure at the bottom of the pump body. The water outlet includes a first water outlet, a second water outlet, and a side water outlet. The first water outlet is communicated with the branched outlet pipe. The second water outlet extends into the U-shaped structure. The pressure spray nozzles are communicated through an annular pipeline arranged inside the U-shaped structure. The annular pipeline is communicated with the side water outlet through a vertical pipe arranged on the inner side wall of the U-shaped structure.

6. The sewage pump backwashing device according to claim 5, characterized in that, The pressure spray nozzle is a funnel-shaped structure with a hollow interior and spiral grooves, and an impeller is arranged inside the funnel-shaped structure.

7. The sewage pump backwashing device according to claim 5, characterized in that, A check device is arranged at the front end of the pressure spray nozzle. The check device includes a lid and a limit protrusion that cooperate with each other. The lid is hinged on one side of the front end of the spray orifice of the pressure spray nozzle, and the limit protrusion is fixedly arranged on the other side of the front end of the spray orifice of the pressure spray nozzle.

8. The sewage pump backwashing device according to claim 1, characterized in that, The filter membrane is a filter membrane with a pore size of 0.1 - 50 microns.

9. The sewage pump backwashing device according to claim 1, characterized in that, The first solenoid valve, the second solenoid valve, and the third solenoid valve are all normally closed solenoid valves.

10. The sewage pump backwashing device according to claim 5, characterized in that, A stop valve is arranged at the connection of the vertical pipe and the side water outlet, and the automatic control system is wirelessly communicatively connected to the stop valve.

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