Dewatering well silt-preventing water pumping device

Abstract

The utility model belongs to the technical field of engineering foundation pit dewatering, and particularly provides a dewatering well silt-preventing water pumping device which comprises a vertical submersible pump, a stirring impeller, a three-way connector and a back washing pipe, water enters from the side portion of the vertical submersible pump, water exits from the top of the vertical submersible pump, a water outlet is communicated with the back washing pipe, and the stirring impeller is rotatably arranged below the water inlet. The water flow sprayed out of the first water distribution port of the backwashing pipe can drive the stirring impeller to rotate, the stirring impeller can stir surrounding water in a larger range during rotation, deposited silt is stirred up, and the silt can be pumped out by the vertical submersible pump along with water. According to the invention, a backwash pipe and a stirring impeller are adopted to realize large-range stirring of a water body, and sediment deposition is prevented. Compared with the mode that a plurality of backwashing pipes are arranged in the prior art, large-range stirring of water can be achieved only through one backwashing pipe, the actual water pumping flow of the vertical submersible pump is larger, and water pumping efficiency can be improved.

Description

Technical Field

[0001] This application belongs to the field of engineering foundation pit dewatering technology, and more specifically, it relates to a dewatering well anti-siltation pumping device. Background Technology

[0002] During construction, if the groundwater level is higher than the excavation depth, groundwater will continuously seep into the pit, making construction impossible and potentially causing slope instability and piping at the bottom. Therefore, dewatering wells need to be installed around the pit to allow groundwater to seep into them. Water pumps are then used to extract the water from these wells, ensuring the pit can be constructed under dry conditions. During dewatering, the amount of sediment deposited in the wells gradually increases over time. This is especially problematic when the strata contain layers of gravel and silt, which can lead to significant sediment buildup at the bottom of the wells, eventually burying the pumps and hindering their operation.

[0003] In the prior art, the solution to the above-mentioned technical problems is to add a backwash pipe to the outlet of the water pump. One end of the backwash pipe is connected to the outlet of the water pump, and the other end faces downwards from the water pump. This allows a portion of the water pumped out by the water pump to be guided to the bottom of the well. The backwash pipe generates water flow to flush up the sediment deposited at the bottom of the well, so that the sediment can be pumped to the outside along with the water in the well, thereby preventing the water pump from being buried by sediment to a certain extent.

[0004] Considering that the flushing range of a single backwash pipe is small and the amount of sediment it can agitate is also limited, existing technologies employ multiple flush pipes to improve the flushing effect. For example, Chinese Patent Publication No. CN 218439714U, entitled "Anti-clogging Device for a Water Pump," discloses a method of arranging multiple backwash pipes around a water pump to enhance flushing capacity. However, while these measures in the prior art improve backwashing capacity, multiple backwash pipes still concentrate flushing in only a few directions, failing to evenly cover the area around the water pump, resulting in a less than ideal flushing effect. Utility Model Content

[0005] Based on the above-mentioned technical problems, this application provides a dewatering well anti-siltation pumping device to solve the technical problem in the prior art that the backwash pipe cannot evenly cover the area around the water pump.

[0006] To achieve the above objectives, the technical solution adopted in this application is: to provide a desilting pumping device for rainwater wells, comprising:

[0007] A vertical submersible pump with an inlet on the side and an outlet on the top;

[0008] An agitator is coaxially mounted on the outer periphery of the vertical submersible pump and located below the water inlet. The agitator rotates with the vertical submersible pump, and the agitator has multiple agitator blades along its circumference.

[0009] A three-way connector has one inlet and two outlets, the inlet being connected to the outlets, and one of the outlets being connected to a pumping pipe; and

[0010] The backwash pipe has one end connected to the other outlet of the three-way connector, and the other end extends downward to below the inlet. The backwash pipe has a first water outlet, and the water outlet of the first water outlet is directed towards the agitator blade.

[0011] In one possible implementation, the vertical submersible pump is fitted with a mounting ring on its outer periphery, the mounting ring being located below the water inlet, and the inner ring of the agitator impeller is rotatably engaged with the mounting ring.

[0012] In one possible implementation, the inner hole of the mounting ring slides into the outer wall of the vertical submersible pump, and the side wall of the mounting ring is provided with a plurality of fixing holes along its own circumference. The fixing holes are threaded with tightening screws, and the screw end of the tightening screw abuts against the side wall of the vertical submersible pump.

[0013] In one possible implementation, a rolling bearing is provided between the outer wall of the mounting ring and the inner ring of the agitator impeller, the inner ring of the rolling bearing is connected to the outer wall of the mounting ring, the outer ring of the rolling bearing is connected to the inner wall of the agitator impeller, and a rolling element is provided between the inner and outer rings of the rolling bearing.

[0014] In one possible implementation, the first water outlet is provided with a first nozzle, and the water outlet of the first nozzle is directed toward the agitating blades.

[0015] In one possible implementation, the vertical submersible pump has a filter screen on its outer periphery, the filter screen being annular and covering the outside of the inlet.

[0016] In one possible implementation, the desilting well anti-sludge pumping device further includes a scraper impeller, which is coaxially sleeved on the outer periphery of the vertical submersible pump and located above the water inlet. The scraper impeller rotates with the vertical submersible pump, and the scraper impeller has multiple scraper blades formed along its circumference. The scraper blades extend downward to the lower part of the filter screen and are in contact with the outer wall of the filter screen. The backwash pipe is also provided with a second water distribution port, which is provided with a second nozzle. The water outlet direction of the second nozzle is towards the scraper blades.

[0017] In one possible implementation, a backwash port is formed at the end of the backwash pipe away from the tee joint, and the backwash port is provided with a backwash nozzle, the outlet cross-sectional area of ​​the backwash nozzle being smaller than the inner bore cross-sectional area of ​​the backwash pipe.

[0018] In one possible implementation, the dewatering well anti-siltation pumping device further includes a fixed support, one end of which is connected to the vertical submersible pump and the other end of which is connected to the backwash pipe.

[0019] In one possible implementation, the top of the vertical submersible pump is provided with a lifting ring, and a protective railing is provided around the outer perimeter of the agitator impeller, the protective railing being connected to the vertical submersible pump.

[0020] Compared with the prior art, the beneficial effects of the anti-siltation pumping device for dewatering wells provided in this application are:

[0021] This application provides a dewatering well anti-siltation pumping device comprising a vertical submersible pump, an agitator impeller, a tee connector, and a backwash pipe. The vertical submersible pump has a side inlet and a top outlet, with the outlet connected to the backwash pipe. The agitator impeller is rotatably positioned below the inlet. The water flow from the first branch of the backwash pipe drives the agitator impeller to rotate. During rotation, the agitator impeller agitates the surrounding water over a wider area, stirring up deposited silt and allowing it to be pumped out along with the water. This application uses a single backwash pipe and an agitator impeller to achieve extensive water agitation, preventing siltation. Compared to existing technologies that use multiple backwash pipes, this method provides a wider flushing coverage area, requires only one backwash pipe to achieve extensive water agitation, and allows for a larger actual pumping flow rate from the vertical submersible pump, thus improving pumping efficiency. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a dewatering well anti-siltation pumping device provided in Embodiment 1 of this application;

[0024] Figure 2 This is a schematic diagram showing the fit between the mounting ring and the agitator impeller in Embodiment 1 of this application;

[0025] Figure 3 This is an internal cross-sectional view of the mounting ring and agitator impeller in Embodiment 1 of this application;

[0026] Figure 4 This is a schematic diagram of the structure of a dewatering well anti-siltation pumping device provided in Embodiment 2 of this application;

[0027] Figure 5 This is a schematic diagram of the vertical submersible pump in Embodiment 2 of this application;

[0028] Figure 6 This is a schematic diagram illustrating the use of a desilting pumping device in a dewatering well, as provided in Embodiment 1 of this application.

[0029] Figure 7 This is a schematic diagram of a desilting pumping device for a dewatering well, provided in Embodiment 3 of this application.

[0030] Explanation of reference numerals in the attached figures:

[0031] 10. Vertical submersible pump; 11. Mounting ring; 111. Tightening screw; 112. Rolling bearing; 12. Filter screen; 13. Lifting ring; 14. Fixed bracket; 20. Agitator impeller; 21. Agitator blade; 30. T-joint; 40. Backwash pipe; 41. First nozzle; 42. Second nozzle; 43. Backwash nozzle; 50. Scraper impeller; 51. Scraper blade; 60. Guardrail. Detailed Implementation

[0032] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0033] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0034] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "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 application and simplifying the description, 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 application.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0037] Please refer to the following: Figures 1 to 7 The following describes a desilting and pumping device for a dewatering well provided in Embodiments 1, 2 and 3 of this application.

[0038] Please see Figures 1 to 5 This application provides a desilting pumping device for a dewatering well, comprising a vertical submersible pump 10, an agitator impeller 20, a tee connector 30, and a backwash pipe 40. The vertical submersible pump 10 has an inlet on its side and an outlet on its top. The agitator impeller 20 is coaxially sleeved on the outer periphery of the vertical submersible pump 10 and located below the inlet. The agitator impeller 20 rotates with the vertical submersible pump 10, and the agitator impeller 20 has multiple agitator blades 21 formed along its circumference. The tee connector 30 has one inlet end and two outlet ends. The inlet end is connected to the outlet end, and one of the outlet ends is connected to a pumping pipe. One end of the backwash pipe 40 is connected to the other outlet end of the tee connector 30, and the other end extends downward to below the inlet. A first branch outlet is provided on the backwash pipe 40, and the water outlet of the first branch outlet faces the agitator blades 21.

[0039] Compared with the prior art, the beneficial effects of the anti-siltation pumping device for dewatering wells provided in this application are:

[0040] This application provides a dewatering well anti-siltation pumping device comprising a vertical submersible pump 10, an agitator impeller 20, a tee connector 30, and a backwash pipe 40. The vertical submersible pump 10 has a side inlet and a top outlet, with the outlet connected to the backwash pipe 40. The agitator impeller 20 is rotatably positioned below the inlet. The water flow from the first branch outlet of the backwash pipe 40 drives the agitator impeller 20 to rotate. During rotation, the agitator impeller 20 can agitate the surrounding water over a wider area, stirring up deposited silt and allowing it to be pumped out by the vertical submersible pump 10 along with the water. This application uses one backwash pipe 40 and one agitator impeller 20 to achieve a wide-area agitation of the water, preventing siltation. Compared to the prior art using multiple backwash pipes 40, the flushing coverage is wider, and only one backwash pipe 40 is needed to achieve a wide-area agitation of the water. The actual pumping flow rate of the vertical submersible pump 10 is also larger, thus improving pumping efficiency.

[0041] like Figure 6 As shown, the vertical submersible pump 10 needs to be lowered into the dewatering well during operation. The pump 10 has an inlet on its side and an outlet on its top. The outlet is connected to a pumping pipe via a tee connector 30. The pumping pipe extends upwards to the ground and is a rubber hose, capable of pumping water from the dewatering well to the surface. The vertical submersible pump 10 can be any commercially available pump product, without restrictions on its specific specifications or model.

[0042] The agitator impeller 20 is coaxially sleeved on the outer periphery of the vertical submersible pump 10. The agitator impeller 20 has multiple agitator blades 21 at equal intervals along its own circumference. The water flow sprayed from the first water outlet impacts the agitator blades 21, which can drive the agitator impeller 20 to rotate, agitate the surrounding water, and cause the deposited silt to float up.

[0043] The agitator blade 21 can be rod-shaped, paddle-shaped, or turbine-shaped. When rotating, the agitator impeller 20 can generate upward or downward disturbances in the water. Preferably, the agitator impeller 20 generates a downward turbulent water flow, which can stir up sediment deposited below. Of course, when the water flow is upward, it can also carry up some sediment, achieving a certain effect. Therefore, this embodiment does not limit the specific shape and structure of the agitator impeller 20 or the direction of water agitation; users can set it according to their actual needs as long as it meets their requirements.

[0044] The impeller 20 can be made of metal (such as stainless steel, aluminum alloy, etc.) or non-metal (such as engineering plastic), as long as it has sufficient strength and is not easily damaged during use.

[0045] The tee connector 30 and the agitator impeller 20 can be detachably connected to the vertical submersible pump 10. When there is little silt in the dewatering well, the tee connector 30 and the agitator impeller 20 can be removed, so that the vertical submersible pump 10 can be used in dewatering wells where silt is easily accumulated, as well as in ordinary dewatering wells.

[0046] The tee fitting 30 has one inlet and two outlets, allowing a portion of the water pumped by the vertical submersible pump 10 to be diverted into the backwash pipe 40. The tee fitting 30 can be any commercially available pipe fitting product, without restrictions on its specific material, model, or diameter. The backwash pipe 40 can be a metal pipe (such as stainless steel) or a plastic pipe, and the backwash pipe 40 and the tee fitting 30 can be connected via a 90° elbow.

[0047] Please see Figures 1 to 3 In Embodiment 1, to facilitate the installation of the agitator impeller 20, a mounting ring 11 is fitted around the outer periphery of the vertical submersible pump 10. The mounting ring 11 is located below the water inlet, and the inner ring of the agitator impeller 20 is rotatably engaged with the mounting ring 11. The mounting ring 11 can be directly welded to the housing of the vertical submersible pump 10, or it can be fixed to the vertical submersible pump 10 by screws or other fasteners.

[0048] Please see Figures 1 to 3 In Embodiment 1, the inner hole of the mounting ring 11 slides with the outer wall of the vertical submersible pump 10, which facilitates the adjustment of the installation height of the mounting ring 11 according to actual needs. The side wall of the mounting ring 11 has multiple fixing holes along its own circumference. The fixing holes are threaded with tightening screws 111. The screw end of the tightening screw 111 abuts against the side wall of the vertical submersible pump 10. Tightening the tightening screw 111 can connect and fix the mounting ring 11 to the vertical submersible pump 10.

[0049] Please see Figure 3 To reduce the rotational resistance of the agitator impeller 20, a rolling bearing 112 is provided between the outer wall of the mounting ring 11 and the inner ring of the agitator impeller 20. The inner ring of the rolling bearing 112 is connected to the outer wall of the mounting ring 11, and the outer ring of the rolling bearing 112 is connected to the inner wall of the agitator impeller 20. A rolling element is provided between the inner and outer rings of the rolling bearing 112. The rolling element can be a ball, tapered roller, cylindrical roller, etc. The rolling bearing 112 can be a product of suitable specifications available on the market, or it can be customized according to actual size requirements.

[0050] To ensure the sealing of the mating surfaces between the mounting ring 11 and the agitator impeller 20, an annular sealing groove can be formed on the outer wall of the mounting ring 11. The sealing groove is located above the rolling bearing 112, and a rubber sealing ring is installed inside the sealing groove. The outer wall of the sealing ring contacts the interior of the agitator impeller 20, which can prevent fine mud and sand from entering the gap between the agitator impeller 20 and the mounting ring 11 and causing jamming.

[0051] Please see Figure 1 In Embodiment 1, the first water outlet is equipped with a first nozzle 41, and the water outlet direction of the first nozzle 41 is towards the agitator blade 21. The first nozzle 41 can be replaced. When a smaller diameter first nozzle 41 is used, the water pressure generated is greater, and the rotation speed of the agitator blade 21 is faster. The specific diameter of the first nozzle 41 can be selected and set according to the actual situation.

[0052] Please see Figure 1 and Figure 5 In Embodiment 1, a filter screen 12 is provided on the outer periphery of the vertical submersible pump 10. The filter screen 12 is annular and covers the outside of the water inlet. Specifically, the filter screen 12 can be a metal mesh. Multiple circular or waist-shaped mesh holes are evenly distributed on the filter screen 12, which can prevent larger particles from being sucked into the vertical submersible pump 10 and colliding with the impeller, causing damage to the impeller.

[0053] Please see Figure 4 Based on the above embodiment one, embodiment two of a dewatering well anti-siltation pumping device further includes a scraper impeller 50. The scraper impeller 50 is coaxially sleeved on the outer periphery of the vertical submersible pump 10 and located above the water inlet. The scraper impeller 50 rotates with the vertical submersible pump 10. The scraper impeller 50 has a plurality of scraper blades 51 formed along its own circumference. The scraper blades 51 extend downward to the lower part of the filter screen 12 and are attached to the outer wall of the filter screen 12. A second water distribution port is also provided on the backwash pipe 40. The second water distribution port is provided with a second nozzle 42. The water outlet direction of the second nozzle 42 is towards the scraper blades 51.

[0054] In this embodiment, a second water distribution port is provided on the backwash pipe 40, which is located above the first water distribution port. The second nozzle 42 is installed at the second water distribution port and can generate a water flow that drives the scraping impeller 50 to rotate. When the scraping impeller 50 rotates, the scraping blades 51 can scrape the outer wall of the filter screen 12 to prevent large particles of impurities from clogging the mesh of the filter screen 12 and causing poor water intake.

[0055] The shape, structure and arrangement of the scraping impeller 50 can be the same as those of the agitating impeller 20 described above, and will not be repeated here.

[0056] Please see Figure 1 and Figure 4 In Embodiment 1 or Embodiment 2, a backwash port is formed at the end of the backwash pipe 40 away from the tee connector 30. The backwash port is equipped with a backwash nozzle 43. The outlet cross-sectional area of ​​the backwash nozzle 43 is smaller than the inner hole cross-sectional area of ​​the backwash pipe 40, which can generate a high-pressure water flow to flush up the mud and sand below.

[0057] It should be noted that the backwash nozzle 43, as well as the first nozzle 41 and the second nozzle 42 mentioned above, can all be commercially available water outlet nozzles. There are no restrictions on the specific specifications or models of these nozzles, as long as they can spray water at a relatively high pressure. Depending on the requirements, the outlet shape of these nozzles can be circular, oval, or other shapes.

[0058] Please see Figure 1 and Figure 4 In Embodiment 1 or Embodiment 2, a dewatering well anti-siltation pumping device further includes a fixed bracket 14. One end of the fixed bracket 14 is connected to the vertical submersible pump 10, and the other end has an arc-shaped limiting groove for accommodating the backwash pipe 40. The side wall of the backwash pipe 40 is engaged in the arc-shaped limiting groove to provide auxiliary support for the backwash pipe 40 and prevent the backwash pipe 40 from tilting.

[0059] Please see Figure 1 , Figure 4 and Figure 5 In Embodiment 1, Embodiment 2, or Embodiment 3, the top of the vertical submersible pump 10 is equipped with a lifting ring 13. The vertical submersible pump 10 can be lowered into the dewatering well using the lifting ring 13, and can be lifted out using the lifting ring 13 after pumping is complete. The lifting ring 13 can be detachably connected to the housing of the vertical submersible pump 10 via studs, or it can be directly welded to the top of the vertical submersible pump 10. The number of lifting rings 13 can be set to one or more as needed.

[0060] Please see Figure 7 To prevent the agitator impeller 20 from colliding and being damaged with the well wall during the hoisting of the vertical submersible pump 10, in addition to the above-mentioned embodiment one or embodiment two, embodiment three also includes a protective railing 60 surrounding the agitator impeller 20. The protective railing 60 is fixed to the side wall of the vertical submersible pump 10 by a connecting rod. The protective railing 60 surrounds the outer perimeter of the agitator impeller 20. The first nozzle 41 sprays water onto the agitator impeller 20 through the gaps in the railing of the protective railing 60. The protective railing 60 can prevent the agitator impeller 20 from colliding and being damaged with the well wall of the dewatering well or from foreign objects getting entangled on the agitator impeller 20.

[0061] It should be noted that the spacing between the guardrails 60 should not be too small, otherwise it may affect the agitation effect of the impeller 20 on the surrounding water. Similarly, a similar protective structure can be set on the outer periphery of the scraper impeller 50 to prevent the scraper impeller 50 from being damaged by collision with the well wall.

[0062] It is understood that the parts in the above embodiments can be freely combined or deleted to form different combined embodiments. The specific contents of each combined embodiment will not be repeated here. After this description, it can be considered that the present utility model specification has recorded each combined embodiment and can support different combined embodiments.

[0063] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A desilting pumping device for rainwater wells, characterized in that, include: A vertical submersible pump (10) has an inlet on the side and an outlet on the top; An agitator (20) is coaxially sleeved on the outer periphery of the vertical submersible pump (10) and located below the water inlet. The agitator (20) rotates with the vertical submersible pump (10). The agitator (20) has multiple agitator blades (21) formed along its own circumferential direction. The three-way connector (30) has one inlet end and two outlet ends, the inlet end being connected to the outlet end, and one of the outlet ends being connected to a water pumping pipe; The backwash pipe (40) is connected at one end to the other outlet of the three-way connector (30), and at the other end extends downward to below the inlet. The backwash pipe (40) is provided with a first water outlet, and the water outlet of the first water outlet is directed toward the agitator blade (21).

2. The anti-siltation pumping device for a dewatering well according to claim 1, characterized in that, The vertical submersible pump (10) is fitted with an installation ring (11) on its outer periphery. The installation ring (11) is located below the water inlet. The inner ring of the agitator (20) is rotatably engaged with the installation ring (11).

3. The anti-siltation pumping device for a dewatering well according to claim 2, characterized in that, The inner hole of the mounting ring (11) is slidably fitted with the outer wall of the vertical submersible pump (10). The side wall of the mounting ring (11) is provided with a plurality of fixing holes along its own circumference. The fixing holes are threaded with tightening screws (111), and the screw end of the tightening screws (111) abuts against the side wall of the vertical submersible pump (10).

4. The anti-siltation pumping device for a dewatering well according to claim 2, characterized in that, A rolling bearing (112) is provided between the outer wall of the mounting ring (11) and the inner ring of the agitator (20). The inner ring of the rolling bearing (112) is connected to the outer wall of the mounting ring (11), and the outer ring of the rolling bearing (112) is connected to the inner wall of the agitator (20).

5. The anti-siltation pumping device for a dewatering well according to claim 1, characterized in that, The first water outlet is provided with a first nozzle (41), and the water outlet of the first nozzle (41) is directed toward the stirring blade (21).

6. The anti-siltation pumping device for a dewatering well according to claim 1, characterized in that, The vertical submersible pump (10) is provided with a filter screen (12) on its outer periphery. The filter screen (12) is annular and covers the outside of the water inlet.

7. A desilting and pumping device for a dewatering well according to claim 6, characterized in that, The aforementioned anti-siltation pumping device for a dewatering well also includes a scraper impeller (50), which is coaxially sleeved on the outer periphery of the vertical submersible pump (10) and located above the inlet. The scraper impeller (50) rotates with the vertical submersible pump (10). The scraper impeller (50) has multiple scraper blades (51) formed along its circumference. The scraper blades (51) extend downward to the lower part of the filter screen (12) and are attached to the outer wall of the filter screen (12). A second water distribution port is also provided on the backwash pipe (40). The second water distribution port is provided with a second nozzle (42), and the water outlet direction of the second nozzle (42) is towards the scraper blades (51).

8. The anti-siltation pumping device for a dewatering well according to claim 1, characterized in that, The backwash pipe (40) has a backwash port at the end away from the tee connector (30), and the backwash port is provided with a backwash nozzle (43). The outlet cross-sectional area of ​​the backwash nozzle (43) is smaller than the inner hole cross-sectional area of ​​the backwash pipe (40).

9. A desilting and pumping device for a dewatering well according to claim 1, characterized in that, The aforementioned anti-siltation pumping device for a dewatering well also includes a fixed support (14), one end of which is connected to the vertical submersible pump (10), and the other end is connected to the backwash pipe (40).

10. A desilting pumping device for a dewatering well according to claim 1, characterized in that, The top of the vertical submersible pump (10) is provided with a lifting ring (13), and the outer periphery of the agitator impeller (20) is provided with a protective railing (60), which is connected to the vertical submersible pump (10).

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