Dewatering well submersible pump drainage device

Abstract

The utility model discloses a dewatering well submersible pump drainage device, belongs to the field of dewatering and drainage, and aims at dewatering and drainage. Comprising a ponding well, hollow boxes and sliding blocks. Comprising a drainage pipe and a submersible pump, the bottom end of a steel pipe is in butt joint with a water outlet of the submersible pump, the top end of the steel pipe is in butt joint with a water inlet in the bottom end of the drainage pipe, and a pipe diameter reducing connector enabling water flow to form backflow pressure is formed between the steel pipe and the drainage pipe; the top end of the sand blowing pipe is connected to the water outlet of the pipe wall of the steel pipe, and the bottom end of the sand blowing pipe extends downwards to the position below the submersible pump. When the submersible pump runs, water flow enters the steel pipe through the submersible pump, and as the diameter of the steel pipe is larger than that of the drainage pipe, the water flow channel is suddenly reduced to form backflow pressure to enter the sand blowing pipe to wash and dilute well bottom settled sand at the bottom of the dewatering well; the functions and the service life of the submersible pump are prevented from being affected by well bottom sand setting, and the effects of protecting the submersible pump and prolonging the service life of the submersible pump are achieved.

Description

Technical Field

[0001] This utility model belongs to the field of dewatering, specifically a dewatering well submersible pump drainage device. Background Technology

[0002] During engineering construction, the working environment in underground spaces is often complex and poses high safety risks. To ensure the safety of foundation pit excavation, the groundwater level must be lowered to at least 0.50 meters below the bottom of the pit. By installing dewatering wells and extracting groundwater, the groundwater level can be effectively lowered, preventing groundwater from flowing into the pit and avoiding water inrush during construction. This helps reduce the hydrostatic pressure and seepage effects acting on the slopes or pit retaining structures, preventing destructive geological processes such as quicksand and piping caused by groundwater seepage, thereby enhancing the stability of the slopes or pit retaining structures. By lowering the groundwater level, foundation pit construction can be carried out above the water level, which not only avoids the complexity and high costs of underwater operations but also improves construction quality.

[0003] During the well construction process for dewatering wells, mud slurry is typically used to stabilize the well walls. After completion, submersible pumps are used to lower the groundwater level. However, during the dewatering process after well completion, it has been found that a large amount of sediment often accumulates at the bottom of the well, which can easily damage the submersible pumps. Utility Model Content

[0004] The purpose of this invention is to provide a protection device for submersible pumps in dewatering wells, which effectively solves the problem of sand settling at the bottom of the well.

[0005] The technical solution adopted by this utility model is: a drainage device for a submersible pump in a dewatering well, including a drainage pipe and a submersible pump, with a sand blower installed between the drainage pipe and the submersible pump. The sand blower includes a steel pipe and a sand blowing pipe. The bottom end of the steel pipe is connected to the outlet of the submersible pump, and the top end of the steel pipe is connected to the bottom inlet of the drainage pipe. The diameter of the steel pipe is larger than that of the drainage pipe, and a pipe diameter reduction joint is formed between the steel pipe and the drainage pipe to create backflow pressure. The steel pipe has an outlet on its wall, and the top end of the sand blowing pipe is connected to the outlet on the steel pipe wall, while the bottom end extends downward to below the submersible pump.

[0006] Furthermore, flanges are welded to the top and bottom of the steel pipe, respectively.

[0007] Furthermore, a flange is used to connect the top end of the steel pipe to the bottom end of the drain pipe; a flange is also used to connect the bottom end of the steel pipe to the outlet of the submersible pump.

[0008] Furthermore, the sandblasting pipe is welded to the steel pipe.

[0009] Furthermore, the diameter of the steel pipe is consistent with the outlet diameter of the submersible pump.

[0010] Furthermore, the diameter of the drainage pipe is 1 / 3 of the diameter of the steel pipe.

[0011] Furthermore, a stainless steel filter screen is fitted onto the water inlet of the submersible pump.

[0012] The beneficial effects of this utility model are as follows: The drainage device for a submersible pump in a dewatering well disclosed in this utility model has a sand blower installed between the drainage pipe and the submersible pump. When the submersible pump is running, water flows through the submersible pump into the steel pipe. Because the diameter of the steel pipe is larger than the diameter of the drainage pipe, the water flow channel suddenly narrows, creating backflow pressure that enters the sand blower pipe. This flushes and dilutes the sediment at the bottom of the dewatering well, and then pumps it out through the submersible pump and discharges it through the drainage pipe. This avoids the sediment at the bottom of the well affecting the function and service life of the submersible pump, thus achieving the effect of protecting the submersible pump and extending its lifespan. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of existing technology;

[0014] Figure 2 This is a schematic diagram of the present invention;

[0015] Figure 3 for Figure 2 Top view.

[0016] In the diagram, 1 is a steel pipe, 2 is a flange, 3 is a sand blowing pipe, 4 is a bolt hole, 5 is a submersible pump, 6 is a drainage pipe, 7 is a filter screen, 8 is a well bottom sedimentation tank, and 9 is a dewatering well. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] In this utility model, the terms "vertical," "upper," "lower," "top," and "bottom," etc., indicate the orientation or positional relationship based on the appendix. Figure 2 The orientation or positional relationship shown is for the purpose of describing the present invention only, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0019] Traditional rainwater well submersible pump drainage devices, such as Figure 1As shown, the system includes a drain pipe 6 and a submersible pump 5. The inlet of the drain pipe 6 is directly connected to the outlet of the submersible pump 5. The submersible pump 5 is installed inside a dewatering well 9, pumping out water from the well and discharging it through the drain pipe 6. However, during use, a large amount of mud, sand, etc., often accumulates at the bottom of the dewatering well 9, forming sediment 8. The submersible pump 5 has difficulty directly pumping out this sediment 8, and this sediment 8 can easily damage the submersible pump 5 after being pumped in. To solve the problem of sediment 8 affecting the use of the submersible pump 5, and to protect the submersible pump and ensure smooth drainage operations, this invention changes the traditional direct connection between the drain pipe 6 and the submersible pump 5, as follows: Figure 2 and Figure 3 As shown, a sand blower is installed between the drain pipe 6 and the submersible pump 5. Specifically, the sand blower includes a steel pipe 1 and a sand blowing pipe 3. The bottom end of the steel pipe 1 is connected to the outlet of the submersible pump 5, and the top end of the steel pipe 1 is connected to the bottom inlet of the drain pipe 6. The diameter of the steel pipe 1 is larger than the diameter of the drain pipe 6. A pipe diameter reduction joint is formed between the steel pipe 1 and the drain pipe 6 to create backflow pressure. The steel pipe 1 has an outlet on its wall. The top end of the sand blowing pipe 3 is connected to the outlet on the wall of the steel pipe 1, and the bottom end extends downward to below the submersible pump 5.

[0020] The improved submersible pump drainage device for dewatering wells works as follows: When submersible pump 5 is running, water flows through pump 5 into steel pipe 1. Because the diameter of steel pipe 1 is larger than that of drainage pipe 6, the water flow channel narrows abruptly as the water flows from steel pipe 1 into drainage pipe 6, creating backflow pressure. Under this backflow pressure, water flows into sand blowing pipe 3. The water flowing into drainage pipe 6 acts on the sediment 8 at the bottom of dewatering well 9, dispersing it. After being dispersed, the sediment 8 mixes with the water in dewatering well 9 and is no longer sediment, but dispersed and mixed with the water. It does not clog submersible pump 5 and can be pumped out through drainage pipe 6. This cycle continues until the mud and sand at the bottom of the well are completely removed. This achieves the effect of protecting the submersible pump and extending its lifespan. Figure 2 The arrow indicates the direction of water flow.

[0021] To facilitate the installation of steel pipe 1, flanges 2 are welded to both the top and bottom ends of steel pipe 1, and bolt holes 4 are provided on the flanges 2. The top end of steel pipe 1 is connected to the bottom end of drain pipe 6 by flanges; the bottom end of steel pipe 1 is connected to the outlet of submersible pump 5 by flanges. The flange connection facilitates disassembly, assembly, inspection, and replacement.

[0022] For ease of manufacturing, the sand-blowing pipe 3 is welded to the steel pipe 1. The sand-blowing pipe 3 and the steel pipe 1 can be prefabricated as finished products, eliminating the need for on-site assembly.

[0023] The diameter of the steel pipe 1 is the same as the outlet diameter of the submersible pump 5.

[0024] To ensure sufficient backflow pressure, preferably, the diameter of the drain pipe 6 is 1 / 3 of the diameter of the steel pipe 1. Let the diameter of the drain pipe 6 be d and the diameter of the steel pipe 1 be D, then d≈1 / 3D. The diameter of the sand blowing pipe 3 should not be too large to ensure that the outflow pressure can flush the sediment 8 at the bottom of the well. The diameter of the sand blowing pipe 3 is usually 2-3 cm.

[0025] In order to filter out large particles that cannot be pumped out with water, preferably, a stainless steel filter screen 7 is installed on the water inlet of the submersible pump 5.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dewatering device for a precipitation well submersible pump, comprising a dewatering pipe (6) and a submersible pump (5), characterized in that: A sand blower is provided between the drain pipe (6) and the submersible pump (5). The sand blower includes a steel pipe (1) and a sand blowing pipe (3). The bottom end of the steel pipe (1) is connected to the outlet of the submersible pump (5), and the top end of the steel pipe (1) is connected to the bottom inlet of the drain pipe (6). The diameter of the steel pipe (1) is larger than that of the drain pipe (6). A pipe diameter reduction joint is formed between the steel pipe (1) and the drain pipe (6) to make the water flow generate backflow pressure. The pipe wall of the steel pipe (1) is provided with an outlet. The top end of the sand blowing pipe (3) is connected to the outlet of the pipe wall of the steel pipe (1), and the bottom end extends downward to the bottom of the submersible pump (5).

2. The precipitation well submersible pump drainage apparatus of claim 1, wherein: The top and bottom ends of the steel pipe (1) are respectively welded with flanges (2).

3. The precipitation well submersible pump drainage apparatus of claim 2, wherein: The top end of the steel pipe (1) is connected to the bottom end of the drain pipe (6) by a flange; the bottom end of the steel pipe (1) is connected to the outlet of the submersible pump (5) by a flange.

4. The precipitation well submersible pump drainage apparatus of claim 1, wherein: The sand blowing pipe (3) is welded to the steel pipe (1).

5. The precipitation well submersible pump drainage apparatus of any one of claims 1-4, wherein: The diameter of the steel pipe (1) is the same as the outlet diameter of the submersible pump (5).

6. The submersible pump drainage device for dewatering wells as described in any one of claims 1-4, characterized in that: The diameter of the drain pipe (6) is 1 / 3 of the diameter of the steel pipe (1).

7. The precipitation well submersible pump drainage apparatus of any one of claims 1-4, wherein: A stainless steel filter screen (7) is fitted onto the water inlet of the submersible pump (5).

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