An open ditch drainage pump external filter device

Abstract

This utility model discloses an external filtration device for open ditch drainage pumps, including a first filter cylinder (1) with an open top, the first filter cylinder (1) having multiple first filter holes (10), a second filter cylinder (2) with an open top located inside the first filter cylinder (1), the second filter cylinder (2) having multiple second filter holes (20), the bottom of the first filter cylinder (1) being magnetically connected to the bottom of the second filter cylinder (2), the second filter cylinder (2) being covered with a filter screen (3), the diameter of the mesh of the filter screen (3) and the diameter of the first filter holes (10) being both smaller than the diameter of the first filter holes (10); and multiple columns (11) being located at the bottom of the first filter cylinder (1). This utility model has the advantage of being easy to use.

Description

Technical Field

[0001] This utility model belongs to the field of drainage pump filtration devices, and in particular relates to an external filtration device for open ditch drainage pumps. Background Technology

[0002] With the development of society and the economy, more and more high-rise buildings are springing up, making the utilization of underground space increasingly important, especially the efficiency of dewatering the foundation pits at the bottom of buildings. In the past, during the construction of open-drainage foundation pit dewatering, water was usually pumped directly through the excavation of ditches and collection wells. Ordinary water pumps were widely used in the construction of foundation pit dewatering for various large buildings. However, in the areas along the Yangtze River and the Yellow River basin, the soil formed by alluvial deposits contains a lot of silt in the foundation pits. When the water pumps are pumping water, the water flow will carry away the silt from the surrounding area and the bottom, making the pumps prone to clogging and affecting the construction speed and efficiency. Therefore, filtration devices are used to reduce the clogging rate of the water pumps.

[0003] The current filtration device used on the construction site is a container with filter holes placed in the foundation pit. The water pump works inside the container, and the filtered water enters the pump, making it less prone to clogging. However, due to the large amount of impurities in the water, all the filtered impurities accumulate on the container, causing frequent blockages. When the container is blocked, workers lift it out along with the pump, clean the blockage, and then lift it back into the foundation pit. This has the following problems: silt and other impurities accumulate rapidly on the surface of the container, requiring frequent cleaning and making it inconvenient to use; the uneven ground in the foundation pit causes the container and pump to roll easily, resulting in the pump's inlet contacting the container's bottom plate or the pump sliding and contacting the container's side wall, leading to poor water flow or even the pump rolling out of the container, requiring re-lifting and adjustment, making it cumbersome to use. Utility Model Content

[0004] The purpose of this invention is to provide an external filtration device for open ditch drainage pumps. This invention has the advantage of being easy to use.

[0005] The technical solution of this utility model is as follows: An external filter device for an open ditch drainage pump includes a first filter cylinder with an open top, which has multiple first filter holes. A second filter cylinder with an open top is located inside the first filter cylinder, which has multiple second filter holes. The bottom of the first filter cylinder and the bottom of the second filter cylinder are magnetically connected. A filter screen is covered on the second filter cylinder. The diameter of the mesh of the filter screen and the diameter of the first filter holes are both smaller than the diameter of the first filter holes.

[0006] In the aforementioned external filtration device for open ditch drainage pumps, the bottom of the first filter cylinder is provided with multiple columns.

[0007] In the aforementioned external filtration device for open ditch drainage pumps, the first filter hole is located on the circumferential surface of the first filter cylinder, the second filter hole is located on the circumferential surface of the second filter cylinder, and the filter screen covers the outer or inner circumferential surface of the second filter cylinder.

[0008] In the aforementioned external filtration device for open ditch drainage pumps, the filter screen is made of interwoven spring steel wires.

[0009] In the aforementioned external filtration device for open ditch drainage pumps, a first magnet is provided at the bottom center of the first filter cylinder, and a second magnet is provided at the bottom center of the second filter cylinder. Both the first magnet and the second magnet are cylindrical.

[0010] In the aforementioned external filter device for open ditch drainage pumps, the diameter of the first filter hole is 8-15mm; when the filter screen covers the outer circumferential surface of the second filter cylinder, the diameter of the second filter hole is 0.5-1mm and the mesh diameter of the filter screen is 2-3mm; when the filter screen covers the inner circumferential surface of the second filter cylinder, the diameter of the second filter hole is 2-3mm and the mesh diameter of the filter screen is 0.5-1mm.

[0011] Compared with existing technologies, this utility model features two filter cylinders and one filter screen, achieving three-stage filtration. It filters impurities such as mud and sand in stages, distributing the filtered impurities in multiple locations, making the device less prone to clogging and reducing cleaning frequency, thus making it more convenient to use. The first filter cylinder has larger filter holes to intercept larger debris, achieving coarse filtration. Due to the large filter holes, the first filter cylinder is less prone to clogging and can be fixed in the pit for long-term use. The second filter cylinder and filter screen have smaller diameter holes, intercepting finer mud and sand, preventing the water pump from clogging. When the second filter cylinder and filter screen become clogged, the first filter cylinder can be lifted out for cleaning. During cleaning, the second filter cylinder and filter screen can be quickly separated and reassembled, making it convenient to use. After cleaning, the second filter cylinder is lifted back into the first filter cylinder. Because the first filter cylinder remains stationary in the pit, the second filter cylinder is placed stably inside the first filter cylinder, preventing the water pump from rolling and ensuring unobstructed water intake without the need for readjustment, making it convenient to use. In summary, this utility model has the advantage of being easy to use. Attached Figure Description

[0012] Figure 1 This is a top-down perspective view of Example 1.

[0013] Figure 2 This is a three-dimensional schematic diagram of Example 1 viewed from below.

[0014] Figure 3 This is a schematic diagram of a filter screen when it is flattened.

[0015] The labels in the attached diagram are: 1-first filter cylinder, 10-first filter hole, 11-column, 12-first magnet, 2-second filter cylinder, 20-second filter hole, 21-second magnet, 3-filter screen. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0017] Example 1: An external filter device for open ditch drainage pumps, such as Figure 1 As shown, the filter includes a first filter cylinder 1 with a top opening. The first filter cylinder 1 has multiple first filter holes 10 on its circumference, each 10mm in diameter, used to intercept larger debris such as stones, branches, and plastic film. The bottom of the first filter cylinder 1 has four uprights 11. A cylindrical first magnet 12 is located at the center of the bottom of the first filter cylinder 1. Preferably, the bottom of the uprights 11 can be sharpened.

[0018] The inner side of the first filter cylinder 1 is provided with a second filter cylinder 2 with a top opening. The second filter cylinder 2 has a plurality of second filter holes 20 on its circumference. The diameter of the second filter holes 20 is 2.5 mm. A cylindrical second magnet 21 is provided at the bottom center of the second filter cylinder 2.

[0019] The inner circumferential surface of the second filter cylinder 2 is covered with a filter screen 3. The filter screen 3 has an aperture diameter of 0.5-1mm and is made of stainless steel spring wire interwoven and spot-welded. In its free state, the filter screen 3 is curled into a C-shape with a curling diameter larger than the inner diameter of the second filter cylinder 2. After the filter screen 3 is placed inside the second filter cylinder 2, it unfolds under elasticity and adheres to the inner wall of the second filter cylinder 2, with the two ends of the filter screen 3 overlapping. The overlap length should exceed 2cm to ensure that the filter screen 3 covers all the second filter holes 20.

[0020] The first filter cartridge 1 and the second filter cartridge 2 are both cylindrical in shape, and the next best shape is a polygonal prism.

[0021] The method of use in Example 1 is as follows: First, pass a rope through the first filter hole 10 at the top of the first filter cylinder 1, and use the rope to lower the first filter cylinder 1 to the target position in the foundation pit. The weight of the first filter cylinder 1 will cause the support column 11 to be driven into the soil at the target position, ensuring the first filter cylinder 1 is placed stably. The optimal condition is for workers to enter the foundation pit to place the first filter cylinder 1. At this time, pressure can be applied to the first filter cylinder 1 manually, causing the support column 11 to be driven deeper into the soil, resulting in a more stable placement of the first filter cylinder 1.

[0022] The second filter cartridge 2 and filter screen 3 are pre-assembled into a component. A rope is first threaded through the second filter hole 20 at the top of the second filter cartridge 2, and the water pump is placed inside the second filter cartridge 2. The second filter cartridge 2 is then lowered into the first filter cartridge 1 using the rope. The second filter cartridge 2 is fixed inside the first filter cartridge 1 by the attraction between the first magnet 12 and the second magnet 21. Since both the first magnet 12 and the second magnet 21 are cylindrical, they have a self-aligning and coaxial magnetic force, making it relatively easy to place the second filter cartridge 2 in the center area of ​​the first filter cartridge 1. The relatively even spacing between the first filter cartridge 1 and the second filter cartridge 2 facilitates the smooth flow of water, improving the filtration effect.

[0023] The water pump is placed in the second filter cylinder 2. When the pump draws water, the water flows through the first filter cylinder 1, the second filter cylinder 2, and the filter screen 3 in sequence, undergoing three stages of filtration before entering the pump. Because the diameter of the first filter hole 10 is large, the first filter cylinder 1 is rarely clogged. If clogged, the first filter cylinder 1 can be hoisted out of the pit for cleaning. Since the outer side of the first filter cylinder 1 contains larger debris, a long-handled net can be used to scoop out the debris and clear the blockage. Because the diameter of the holes in the second filter hole 20 and the filter screen 3 is smaller, the second filter cylinder 2 and the filter screen 3 are more prone to clogging. If clogged, the second filter cylinder 2 (along with the filter screen 3 and the water pump) can be hoisted out of the pit, separated, and cleaned. After cleaning, it can be reassembled and hoisted back into the first filter cylinder 1, significantly improving the pump's clogging situation.

[0024] Since the water flows inward during pumping, the elasticity of the filter screen 3 itself may not be able to overcome the impact of the water flow, and the filter screen 3 may not be able to fit well into the second filter cylinder 2. Therefore, it is preferable to use multiple wires to bind and fix the filter screen and the second filter cylinder 2.

[0025] The first filter cartridge 1 and the second filter cartridge 2 are made of plastic or non-magnetic stainless steel, such as 304 stainless steel.

[0026] Example 2: Compared with Example 1, the differences are as follows,

[0027] The filter screen 3 covers the outer circumferential surface of the second filter cylinder 2. The diameter of the second filter hole 20 is 0.5-1mm, and the diameter of the mesh of the filter screen 3 is 2.5mm. The curled diameter of the filter screen 3 in its free state is smaller than the outer diameter of the second filter cylinder 2, and the curling angle of the filter screen 3 exceeds 360°. When the filter screen 3 is fitted onto the second filter cylinder 2, the filter screen 3, under the action of elasticity, hugs the second filter cylinder 2 and keeps its two ends overlapping, ensuring that the filter screen 3 covers all the second filter holes 20.

[0028] In Example 2, a hoisting hole is provided at the top of the second filter cylinder 2 to facilitate its hoisting. Since the filter screen 3 is supported by the second filter cylinder 2 when water flows over it, there is no need to tie the filter screen 3 and the second filter cylinder 2 together with wire, making it more convenient to use.

Claims

1. An external filter device for open ditch drainage pumps, characterized in that: The first filter cylinder (1) with a top opening is provided with a plurality of first filter holes (10). The second filter cylinder (2) with a top opening is provided on the inner side of the first filter cylinder (1). The second filter cylinder (2) is provided with a plurality of second filter holes (20). The bottom of the first filter cylinder (1) is magnetically connected to the bottom of the second filter cylinder (2). The second filter cylinder (2) is covered with a filter screen (3). The diameter of the mesh of the filter screen (3) and the diameter of the first filter holes (10) are both smaller than the diameter of the first filter holes (10).

2. The external filter device for open ditch drainage pumps according to claim 1, characterized in that: The bottom of the first filter cylinder (1) is provided with multiple columns (11).

3. The external filter device for open ditch drainage pumps according to claim 1, characterized in that: The first filter hole (10) is located on the circumferential surface of the first filter cylinder (1), the second filter hole (20) is located on the circumferential surface of the second filter cylinder (2), and the filter screen (3) covers the outer or inner circumferential surface of the second filter cylinder (2).

4. The external filter device for open ditch drainage pumps according to claim 1, characterized in that: The filter screen (3) is made of spring steel wires interwoven in warp and weft.

5. The external filter device for open ditch drainage pumps according to claim 1, characterized in that: The first filter cylinder (1) has a first magnet (12) at the bottom center, and the second filter cylinder (2) has a second magnet (21) at the bottom center. Both the first magnet (12) and the second magnet (21) are cylindrical.

6. The external filter device for open ditch drainage pumps according to claim 1, characterized in that: The diameter of the first filter hole (10) is 8-15 mm; when the filter screen (3) covers the outer circumferential surface of the second filter cylinder (2), the diameter of the second filter hole (20) is 0.5-1 mm and the diameter of the mesh of the filter screen (3) is 2-3 mm; when the filter screen (3) covers the inner circumferential surface of the second filter cylinder (2), the diameter of the second filter hole (20) is 2-3 mm and the diameter of the mesh of the filter screen (3) is 0.5-1 mm.

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