A shallow sand filter cartridge

Abstract

The utility model discloses a kind of shallow sand filter filter core, including flange and filter core screen cylinder, the one end of filter core screen cylinder is closed blind end, the other end is open open end;Still including connecting pipe and connecting disc, the connecting disc has center hole, one end of the connecting pipe is inserted into the flange, and is connected with the flange sleeve fixedly, the other end of the connecting pipe is inserted into the center hole of the connecting disc, and is connected with the connecting disc sleeve fixedly, the open end of the filter core screen cylinder is installed on the side surface of the connecting disc away from the flange, the diameter of the filter core screen cylinder is greater than the aperture of the center hole.The utility model shallow sand filter filter core, by increasing the filter surface of the filter core screen cylinder, reduce water flow velocity, let sand layer filler sand grain in shallow sand filter, water flow, small particulate in water flow can be more orderly, not be stirred and mixed, improve water quality, reduce water pressure simultaneously, prevent filter core blockage, increase water flow.

Description

Technical Field

[0001] This utility model relates to the field of filter technology, and in particular to a shallow sand filter element. Background Technology

[0002] Shallow sand filters, also known as side-stream filters, are primarily used for filtering circulating water, supply water, and wastewater in industrial applications. The general structure of a shallow sand filter includes a filter box, with an inlet pipe connected to the top and an outlet pipe connected to the bottom. Inside the filter box is a filter cartridge, a mesh cylinder structure, embedded within a sand layer of packing material. The sand layer primarily filters impurities from the water, while the filter cartridge filters the sand particles within the packing and other small particulate matter in the water. During use, water enters the filter box through the inlet pipe. Impurities such as fibers and particles are trapped on the sand layer and the filter cartridge, while the water flows through the cartridge into the outlet pipe and out, thus achieving filtration. Shallow sand filters effectively remove particulate matter and reduce turbidity in water using the sand layer packing material. When activated carbon and zeolite are mixed into the sand layer packing, it can even adsorb and remove organic matter and ions from the water.

[0003] Shallow sand filters vary in structure and specifications, resulting in different filtration effects. Common shallow sand filter cartridges have the following structures: Figure 1 As shown, the filter includes a filter cartridge body 101 and a flange 102. The end of the filter cartridge body 101 extends into and is fitted into the flange 102, forming an integral unit with the flange 102. When using this shallow sand filter, the flange 102 is bolted to another flange (not shown) on the outlet pipe to achieve the installation connection between the filter cartridge and the outlet pipe. During use, it was found that the effluent from some of these shallow sand filters was relatively turbid, the filter cartridge was prone to clogging and sand leakage, the effluent flow rate decreased, and the clean circulating water quality was poor. For example, our company's previous shallow sand filters frequently clogged. After a period of observation, after clogging, the effluent flow rate was ≤230t / h, and the effluent turbidity was ≤15mg / L.

[0004] To address this issue, the usual approach is to modify or adjust the shallow sand filter, such as replacing the sand packing, using filter cartridges with different pore sizes (e.g., 101), or adding multiple layers of filtration. However, the most common method is to clean the sand packing and replace the clogged filter cartridges with new, non-clogging ones. This replacement process generally involves replacing old cartridges with new ones within the same existing structure. After replacing the old cartridges with new ones of the same design, the shallow sand filter's structure remains identical to its original state. While this may temporarily solve the clogging problem, after a period of use, the filter's flow rate will rapidly decrease, and the clean water quality will deteriorate. Therefore, frequent cleaning of the sand packing and replacement of filter cartridges is necessary. This not only requires significant manpower, greatly increasing equipment maintenance costs and impacting production, but also fails to address the root cause of the shallow sand filter's turbid effluent. Failure to clean the sand packing and replace filter cartridges in a timely manner will not only affect the water output but also frequently lead to equipment damage. Utility Model Content

[0005] The purpose of this utility model is to provide a shallow sand filter element.

[0006] The technical solution to achieve the purpose of this utility model is: a shallow sand filter element, including a flange and a filter element cylinder, wherein the flange is an existing flange with unchanged size, the cylinder wall of the filter element cylinder has a mesh structure, one end of the filter element cylinder is a closed blind end and the other end is an open end; the shallow sand filter element also includes a connecting pipe and a connecting disc, the connecting disc has a central hole, one end of the connecting pipe extends into the flange and is fixedly connected to the flange, the other end of the connecting pipe extends into the central hole of the connecting disc and is fixedly connected to the connecting disc, the open end of the filter element cylinder is installed on the side surface of the connecting disc away from the flange, and the diameter of the filter element cylinder is larger than the diameter of the central hole.

[0007] Furthermore, the connecting disc is an annular disc. The annular disc design offers advantages such as readily available materials and the absence of sharp edges, reducing the risk of scratching workers during installation.

[0008] Furthermore, the filter element cylinder is coaxial with the central hole.

[0009] Furthermore, the filter element cylinder includes a cylindrical body with both ends through and a steel plate installed on one end of the cylindrical body for sealing, and the cylindrical body is encapsulated with the steel plate to form the blind end of the filter element cylinder.

[0010] This utility model relates to a shallow sand filter cartridge, which modifies the existing shallow sand filter box without altering the flange connecting to the outlet pipe. It increases the filtration surface of the filter cartridge's mesh, reduces the water flow velocity, and allows the sand particles in the sand layer, the water flow, and tiny particles in the water to move more orderly, preventing agitation and mixing. This improves water quality while reducing water pressure, preventing sand particles and tiny particles from being forced into the mesh of the filter cartridge due to high pressure, thus preventing filter cartridge blockage and increasing the outlet flow rate. This utility model fundamentally solves the problems of reduced outlet flow rate, poor circulating water quality, and filter cartridge blockage in some existing shallow sand filters. It not only ensures the quality and flow rate of the shallow sand filter but also significantly reduces the frequency of filter cartridge replacement, thus reducing the maintenance costs of the filter cartridge and equipment.

[0011] This utility model relates to a shallow sand filter cartridge. The filter cartridge and flange are connected via a connecting pipe and a connecting plate to increase the filtration surface of the filter cartridge. On one hand, this structure solves the problems of reduced water flow, poor circulating water quality, and filter cartridge clogging simply by using the filter cartridge. Furthermore, compared to extensive modifications to the original shallow sand filter or the use of multiple filter cartridges to increase the filtration surface, this design minimizes the amount of alteration required. In other words, this utility model's shallow sand filter cartridge easily solves the problem through the filter cartridge, improving efficiency and reducing costs. On the other hand, the flange size remains unchanged, allowing for flexible replacement of the filter cartridge without altering the existing outlet pipe connection flange dimensions. The replacement of the filter cartridge is convenient and cost-effective. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of an existing shallow sand filter element;

[0013] Figure 2 This is a schematic diagram of the main structure of the shallow sand filter element of this utility model;

[0014] Figure 3 This is a schematic diagram of the right side of the shallow sand filter element of this utility model;

[0015] Figure 4 yes Figure 3 A schematic diagram of the cross-sectional structure along line AA. Detailed Implementation

[0016] The preferred embodiment of the shallow sand filter element of this utility model will be described in detail below with reference to the accompanying drawings:

[0017] like Figure 2 As shown in Figure 4, a shallow sand filter element includes a flange 1 and a filter element cylinder 4. The flange 1 is an existing flange with unchanged dimensions. The cylinder wall of the filter element cylinder 4 has a mesh structure. One end of the filter element cylinder 4 is a closed blind end 41, and the other end is an open end 42. The shallow sand filter element also includes a connecting pipe 2 and a connecting disc 3. The connecting disc 3 has a central hole 31. One end of the connecting pipe 2 extends into the flange 1 and is fixedly connected to the flange 1. The other end of the connecting pipe 2 extends into the central hole 31 of the connecting disc 3 and is fixedly connected to the connecting disc 3. The open end 42 of the filter element cylinder 4 is installed on the side surface of the connecting disc 3 away from the flange 1. The diameter D1 of the filter element cylinder 4 is larger than the aperture D2 of the central hole 31.

[0018] This utility model relates to a shallow sand filter element. The flange 1 is an existing flange with unchanged dimensions, capable of connecting to the flange of the outlet pipe inside the filter box. In use, the shallow sand filter element is placed inside the filter box and installed by connecting the flange 1 to the flange of the outlet pipe inside the filter box.

[0019] This utility model relates to a shallow sand filter cartridge. Through the connection of the connecting pipe 2 and the connecting plate 3, one end of the connecting pipe 2 extends into and is secured within the flange 1, while the other end extends into the central hole 31 and is secured to the connecting plate 3. After the open end 42 of the filter cartridge 4 is coaxially mounted on the connecting plate 3, the filter cartridge 4 can be connected to the flange 1 via the connecting pipe 2 and the connecting plate 3. In this connection structure, the filter cartridge 4 is not directly connected to the flange 1, and its installation dimensions are not limited by the inner diameter of the flange 1. When the flange 1 is an existing flange with unchanged dimensions, allowing connection to the outlet pipe flange inside the filter box, the diameter selection of the filter cartridge 4 is more flexible and has a wider range of options, providing conditions for the installation or replacement of large-diameter filter cartridges 4.

[0020] This utility model relates to a shallow sand filter element. When a larger diameter filter element cylinder 4 can be installed or replaced, the diameter D1 of the filter element cylinder 4 is larger than the aperture D2 of the central hole 31, and the diameter of the filter element cylinder 4 is larger than the inner diameter of the flange 1. Compared to filter elements where the filter element cylinder is installed and fitted inside the flange and directly installed through the flange 1, the larger diameter of the filter element cylinder 4 provides a larger filtration surface. Based on the flow velocity formula (v=Q / A, where v is the flow velocity, Q is the flow rate, and A is the cross-sectional area) and Bernoulli's equation (v... 2=2*g*H, where v is the flow velocity, g is the acceleration due to gravity, and H is the water pressure height. Under the same flow rate, the larger the filtration surface of the filter element screen cylinder 4, the lower the water flow velocity through the shallow sand filter element of this utility model. At the same time, the water pressure height above the shallow sand filter element of this utility model is also lower. This has two advantages: First, the lower the water flow velocity, the more orderly the sand particles in the sand layer packing material inside the shallow sand filter and the tiny particles in the water are, making them less likely to be stirred and mixed, resulting in better water quality after passing through the filter element screen cylinder 4. Second, the lower the water pressure height above the filter element screen cylinder 4, the less likely the sand particles in the sand layer packing material inside the shallow sand filter and the tiny particles in the water will be squeezed into the mesh of the filter element screen cylinder 4 due to high pressure, effectively preventing filter element clogging. This increases the water flow rate while greatly reducing the replacement frequency of the filter element, thus reducing the maintenance cost of the filter element and equipment.

[0021] This utility model of a shallow sand filter cartridge is a modification made without altering the flange 1 connecting the existing shallow sand filter box to the outlet pipe. It increases the filtration surface of the filter cartridge 4, reduces the water flow velocity, and allows the sand particles in the sand layer packing, the water flow, and the tiny particles in the water flow to be more orderly, preventing agitation and mixing. This improves water quality while reducing water pressure, preventing sand particles and tiny particles in the water from being forced into the mesh of the filter cartridge 4 due to high pressure, thus preventing filter cartridge blockage and increasing the outlet flow rate. This utility model of a shallow sand filter cartridge fundamentally solves the problems of reduced outlet flow rate, poor circulating water quality, and filter cartridge blockage in some existing shallow sand filters. It not only ensures the outlet water quality and flow rate of the shallow sand filter but also significantly reduces the frequency of filter cartridge replacement, reducing the maintenance costs of the filter cartridge and equipment.

[0022] This utility model relates to a shallow sand filter cartridge. The filter cartridge 4 is connected to the flange 1 via the connecting pipe 2 and the connecting plate 3. This structure increases the filtration surface area of ​​the filter cartridge 4. On one hand, the filter cartridge 4 alone can solve the problems of reduced water flow, poor circulating water quality, and filter cartridge clogging. Furthermore, compared to extensive modifications to the original shallow sand filter or the use of multiple filter cartridges to increase the filtration surface, this design minimizes the amount of modification required. In other words, this utility model's shallow sand filter cartridge can easily solve the problem through the filter cartridge 4, improving efficiency while reducing costs. On the other hand, the size of the flange 1 can remain unchanged. The filter cartridge 4 can be flexibly replaced without altering the existing outlet pipe connection flange installation dimensions. The replacement of the filter cartridge 4 is convenient and cost-effective.

[0023] In this utility model of a shallow sand filter element, preferably, the connecting disc 3 is an annular disc. The annular disc offers advantages such as readily available materials and the absence of sharp edges, reducing the risk of scratching workers during installation.

[0024] In this utility model of a shallow sand filter element, the connecting disc 3 can be, but is not limited to, a flange. Flanges are more readily available.

[0025] In this utility model of shallow sand filter element, preferably, the filter element screen 4 is coaxial with the central hole 31.

[0026] In a preferred embodiment of the present invention, the filter element 4 comprises a cylindrical body 401 extending through both ends and a steel plate 402 installed on one end of the cylindrical body 401 and sealed thereunder. The cylindrical body 401 is encapsulated with the steel plate 402 to form a blind end 41 of the filter element 4.

[0027] For those skilled in the art to which this utility model pertains, several simple deductions or substitutions can be made without departing from the concept of this utility model, and all such deductions or substitutions should be considered to fall within the protection scope of this utility model.

Claims

1. A shallow sand filter element, comprising a flange and a filter element cylinder, wherein the cylinder wall of the filter element cylinder has a mesh structure, one end of the filter element cylinder is a closed blind end and the other end is an open open end; characterized in that: It also includes a connecting pipe and a connecting plate, the connecting plate having a central hole, one end of the connecting pipe extending into the flange and being fixedly connected to the flange, the other end of the connecting pipe extending into the central hole of the connecting plate and being fixedly connected to the connecting plate, the open end of the filter element screen being installed on the side surface of the connecting plate away from the flange, and the diameter of the filter element screen being larger than the diameter of the central hole.

2. The shallow sand filter element according to claim 1, characterized in that: The connecting disk is a ring-shaped disk.

3. The shallow sand filter element according to claim 1, characterized in that: The filter element screen is coaxial with the central hole.

4. The shallow sand filter element according to claim 1, characterized in that: The filter element cylinder includes a cylindrical body that extends through both ends and a steel plate installed on one end of the cylindrical body and sealed thereunder. The cylindrical body is encapsulated with the steel plate to form a blind end of the filter element cylinder.

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