An eccentric filter head for water treatment

Abstract

The application discloses an eccentric filter head used in the field of water treatment, which comprises a filter cap, a filter rod and a connecting piece. The filter cap is a hollow geometric body surrounded by a top plate, a bottom plate and a vertical plate. The vertical plate is provided with a filter slot. The top plate and the bottom plate are provided with straight through installation holes, which are arranged away from the center of the geometric body. The filter rod passes through the upper and lower installation holes and is connected by the connecting piece. The filter cap can rotate around the filter rod to make eccentric rotation of the filter cap. When the filter tank or filter bed is backwashed, the eccentric filter head can make the backwashing gas and water migrate in the horizontal direction for a short distance. The filter beam backwashing dead zone can also be uniformly backwashed by the gas and water, so that the whole filter tank or filter bed is backwashed uniformly and consistently, and the purpose of eliminating the filter tank or filter bed backwashing dead zone is achieved.

Description

Technical Field

[0001] This invention belongs to the field of water treatment, and particularly relates to an eccentric filter head for use in water treatment. Background Technology

[0002] The filter bed is the "heart" of a water treatment plant. When water flows through the filter media layer, unsettled suspended solids in the water are trapped by mechanical retention and adsorption. However, after prolonged operation, the pores between the filter media continuously decrease, the penetration of suspended impurities increases, and the resistance to water flow increases, leading to a rise in the filter bed level and an increase in effluent turbidity. To ensure the filtration effect of the filter bed, the filter media needs to be backwashed. The filter head is the core component of the filter bed for water and air distribution, playing a crucial role in uniform water and air distribution and ensuring the effectiveness of filtration and backwashing.

[0003] Currently, the water distribution and aeration systems of filter beds and filter plates in water treatment processes often have excessively wide filter beams or excessively large gaps between filter plates. This results in filter heads not being able to be installed in the beams and filter plates (equivalent to missing a row of filter heads in the filtration zone). Over time, this causes sludge to accumulate, clump, or form mud slabs in the dead filtration zones of the filter beds or filter plates, seriously affecting the overall water treatment plant's processing capabilities and even posing a risk of environmental pollution. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides an eccentric filter head for water treatment. During backwashing of a filter bed or filter tank, the eccentric filter head proposed in this invention can facilitate short-distance horizontal migration of the backwashing air and water. The dead zones in the filter beams and filter plates can also benefit from the distribution of backwashing air and water, thereby ensuring a balanced and consistent backwashing process for the entire filter bed or filter tank, thus eliminating dead zones in the backwashing process.

[0005] The present invention is achieved through the following technical solution.

[0006] This invention provides an eccentric filter head for water treatment, comprising a filter cap, a filter rod, and a connector. The filter cap is a hollow geometric body formed by a top plate, a bottom plate, and a vertical plate. The vertical plate has a filter slit, and the top and bottom plates have through-holes. The through-holes are offset from the center of the geometric body. The filter rod passes through the upper and lower through-holes and is connected by the connector. The filter cap can rotate around the filter rod, causing the filter cap to rotate eccentrically.

[0007] Furthermore, the filter slits are opened vertically.

[0008] Furthermore, the filter slit is opened on the circumferential vertical plate at the distal end of the hole.

[0009] Furthermore, the filter slit width is 0.3–0.4 mm, the length is 25 mm, and the error is within ±0.03 mm.

[0010] Furthermore, the total area of ​​the filter slits in the filter cap is 3.0–4.0 cm². 2 .

[0011] Furthermore, the backwashing range of the filter head is widened to 30–60 mm.

[0012] Furthermore, the filter cap is made of plastic, metal, or alloy.

[0013] Furthermore, the filter rod is made of plastic, metal, or alloy.

[0014] The beneficial effects of this invention are:

[0015] 1. The eccentric filter head proposed in this invention can migrate the backwashing air and water a short distance in the horizontal direction during backwashing of the filter tank or filter bed. It can migrate the backwashing point of two filter heads that were originally far apart and had uneven backwashing without adjusting the tank structure, thus widening the backwashing influence range of the filter head.

[0016] 2. The eccentric filter head proposed in this invention can rotate flexibly during installation. This allows the backwashing air and water to be delivered to the dead zones of the filter beam and filter plate during backwashing of the filter tank or filter bed. Each dead zone is also distributed with backwashing air and water, thus making the backwashing of the entire filter tank or filter bed uniform and achieving the purpose of eliminating the dead zones of the filter tank or filter bed during backwashing. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the eccentric filter head proposed in Embodiment 1 of the present invention.

[0018] Figure 2 This is a front view of the eccentric filter head proposed in Embodiment 1 of the present invention.

[0019] Figure 3 This is a structural diagram of the filter cap proposed in Embodiment 1 of the present invention from one perspective.

[0020] Figure 4 This is a structural diagram of the filter cap proposed in Embodiment 1 of the present invention from another perspective.

[0021] Figure 5 This is a top view of the filter cap proposed in Embodiment 1 of the present invention.

[0022] Figure 6 This is a bottom structural diagram of the filter cap proposed in Embodiment 1 of the present invention.

[0023] Figure 7 This is a schematic diagram of the manufacturing process of the filter cap proposed in Embodiment 1 of the present invention.

[0024] Figure 8 This is a three-dimensional structural diagram of the eccentric filter head proposed in Embodiment 2 of the present invention.

[0025] Figure 9 This is a three-dimensional structural diagram of the filter cap proposed in Embodiment 2 of the present invention.

[0026] Figure 10 This is a structural diagram of the eccentric filter head proposed in Embodiment 1 of the present invention.

[0027] Figure 11 This is a top view of the application of the eccentric filter head proposed in Embodiment 1 of the present invention.

[0028] Figure 12 for Figure 11 A magnified view of part A in the image.

[0029] Figure 13 for Figure 11 A magnified view of part B in the image.

[0030] Figure 14 This is a comparison diagram of the application spacing between the conventional filter head of the present invention and the eccentric filter head of Example 1.

[0031] Figure 15 This is a comparison image of the surface of the filter media after backwashing in the modified filter bed and the surface of the filter media before modification. Detailed Implementation

[0032] The following description further illustrates the structures involved in this invention and the technical terms used therein. These descriptions are merely illustrative of how the invention is implemented and do not constitute any limitation on the invention.

[0033] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "lateral," and "longitudinal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the indicated position or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this invention, unless otherwise explicitly specified and limited, terms such as "connection" and "fixation" should be interpreted broadly. For example, "fixation" can mean a fixed connection, a detachable connection, or an integral part; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] This invention provides an eccentric filter head for water treatment, comprising a filter cap, a filter rod, and a connector. The filter cap is a hollow geometric body formed by a top plate, a bottom plate, and a vertical plate. The vertical plate has a filter slit, and the top and bottom plates have through-holes. The through-holes are offset from the center of the geometric body. The filter rod passes through the upper and lower through-holes and is connected by the connector. The filter cap can rotate around the filter rod, causing the filter cap to rotate eccentrically.

[0036] As an optional embodiment, the filter cap can be a planar geometry or a curved geometry. The planar geometry is entirely composed of planes, while the curved geometry is composed of both curved surfaces and planes, or entirely of curved surfaces.

[0037] As an optional embodiment, when the filter cap is a planar geometric shape, it can be a regular shape such as a cube, cuboid, heptahedron, or more faces, formed by a top plate, a bottom plate, and vertical plates. The vertical plates can be vertical or inclined, with an inclination angle of 65–90°. The inclination angles of the vertical plates can be the same or different. The filter cap can also be a regular or irregular shape composed of other planes.

[0038] As an optional embodiment, when the filter cap is a curved geometric shape, the filter cap can be a semi-cylinder formed by a flat bottom plate, a curved top plate, and a flat vertical plate, or it can be a hemisphere, or a regular shape formed by a flat bottom plate, a flat top plate, and a curved vertical plate, or it can be any combination of other planes and curved surfaces or a regular or irregular shape composed entirely of curved surfaces.

[0039] As an optional embodiment, the filter cap is a hollow geometry, meaning that the interior of the filter cap is completely or partially hollow.

[0040] As an optional embodiment, the mounting hole can be a regular shape such as round or square, or it can be an irregular shape. The center of the mounting hole is offset from the center of the circumcircle of the top plate and the bottom plate by 27.5mm to 37.5mm.

[0041] As an optional embodiment, the filter slits are vertically spaced either equally or unequally, with a slit width of 0.3mm to 0.4mm and a length of 25mm, with an error within ±0.03mm. The total area of ​​the filter slits in the filter cap is 3.0 to 4.0 cm². 2 .

[0042] As an optional embodiment, the filter slots can be opened on all vertical plates, but preferably only on the circumferential vertical plates at the far end of the hole. A circumferential vertical plate is a vertical plate that surrounds the mounting hole as the center.

[0043] As an optional embodiment, the backwashing range of the filter head is widened to 30mm to 60mm.

[0044] As an alternative embodiment, the filter cap is made of plastic, metal, or alloy.

[0045] As an optional embodiment, the filter rod is made of plastic, metal, or alloy, such as ABS engineering plastic or DN25 stainless steel threaded pipe. Stainless steel filter rods can be used interchangeably with plastic filter rods, thereby reducing product costs.

[0046] Example 1

[0047] like Figure 1-6 As shown in the figure, this embodiment demonstrates an eccentric filter head 1, including a filter cap 11, a filter rod 12, and a connector 13. The filter cap 11 is a hollow planar hexahedron that is narrower at the top and wider at the bottom, formed by a top plate 111, a bottom plate 112, a long vertical plate 113, and a short vertical plate 114. The top plate 111 and the bottom plate 112 have through mounting holes 115. The mounting holes 115 are offset towards the short vertical plate 114. The long vertical plate 113 and the short vertical plate 114 on the side far from the hole have filter slots 116. The filter rod 12 passes through the upper and lower mounting holes 115 and is connected by the connector 13. The filter cap 11 can rotate around the filter rod 12, causing the filter cap to rotate eccentrically.

[0048] As an optional embodiment, the filter cap 11 consists of a top plate 111, a bottom plate 112, two long vertical plates 113, and two short vertical plates 114. The long and short vertical plates have the same inclination angle of 65°. The same inclination angle means that all four vertical plates (two long and two short) have the same inclination angle. Thus, the filter cap 11 has high strength and can resist backwashing forces.

[0049] As an optional embodiment, the filter slits 116 are vertically equidistant, with a width of 0.3 mm and a length of 25 mm. The total area of ​​the filter slits 116 in the filter cap is 3 cm². 2 The length, width, and total area of ​​the filter slots can be designed according to technical dimensional requirements and slot opening ratio specifications.

[0050] As an optional embodiment, a portion of the long vertical plate 113 has filter slits 116, and the filter slits 116 are located close to the short vertical plate 114 where the filter slits are located. That is, the filter slits on the long vertical plate 113 do not cover the entire vertical plate, but are located on one side close to the short vertical plate 114 where the filter slits are located.

[0051] As an optional embodiment, the filter head has an extended backwashing range of 30 mm.

[0052] As an optional embodiment, the mounting hole 115 is circular with a nominal diameter of 25mm. The filter rod 12 is made of ABS engineering plastic, or it can be made of DN25 (diameter 25mm) stainless steel threaded tube. The stainless steel filter rod can be used interchangeably with the plastic filter rod, thereby reducing product costs.

[0053] As an optional embodiment, the center of the mounting hole 115 is offset by 29.5 mm from the center of the outer circle of the top plate and the bottom plate, that is, offset by 29.5 mm from the center of the top plate 111.

[0054] As an optional embodiment, the filter cap 11 is made of 304 stainless steel. The stainless steel material provides extremely high mechanical strength for self-cleaning the filter head, allowing for flushing with large volumes of air and water when clogging occurs.

[0055] The eccentric filter head proposed in this embodiment can migrate the backwashing air and water a short distance horizontally during backwashing of the filter tank or filter bed. This allows two filter heads that were originally far apart and had uneven backwashing to be moved to a single backwashing point without adjusting the tank structure, thus widening the backwashing influence range of the filter head. Furthermore, the eccentric filter head can rotate flexibly during installation. This rotational function allows the backwashing air and water to be delivered to the dead zones in the beam channel and filter plate during backwashing, ensuring that each dead zone receives backwashing air and water distribution. This results in a more uniform backwashing process throughout the entire filter tank or filter bed, effectively eliminating backwashing dead zones.

[0056] like Figure 7 As shown, the manufacturing method of the above-mentioned eccentric filter head is as follows:

[0057] S1: Select 304 stainless steel sheet, laser cut to form main plate, base plate and 2 short vertical plates. Main plate includes top plate and two opposite long vertical plates.

[0058] S2: Laser-cut filter seams on the long vertical plate and one short vertical plate of the main board respectively;

[0059] S3: Laser-cut mounting holes for the top and bottom plates respectively;

[0060] S4: Bending and shaping the motherboard;

[0061] S5: Weld the short vertical plate and the base plate to the main plate respectively.

[0062] The manufactured filter heads have excellent mechanical properties and a theoretical service life of 50 years or more. Similar to the reinforced concrete structures of water plants, there are no issues such as filter head aging or replacement.

[0063] Example 2

[0064] like Figure 8-9As shown in the figure, this embodiment demonstrates an eccentric filter head 2, which includes a filter cap 21, a filter rod 22, and a connector 23. The filter cap 21 is a hollow semi-cylinder formed by a curved top plate 211, a flat bottom plate 212, and a flat vertical plate 213. The top plate 211 and the bottom plate 212 have through mounting holes 214. The mounting holes 214 are offset from the center of the semi-cylinder. The vertical plates 213 on both sides of the curved top plate 211 and at the far end of the hole have filter slots 215. The filter rod 22 passes through the upper and lower mounting holes 214 and is connected by the connector 23. The filter cap 21 can rotate around the filter rod 22, causing the filter cap 21 to rotate eccentrically.

[0065] As an optional embodiment, the center of the mounting hole 214 is offset from the center of the top plate 211 by 35.5 mm.

[0066] As an optional embodiment, the filter slits 215 are vertically equidistant, with a width of 0.4 mm and a length of 25 mm. The total area of ​​the filter slits 215 in the filter cap 21 is 4 cm². 2 The length, width, and total area of ​​the filter slots can be designed according to technical dimensional requirements and slot opening ratio specifications.

[0067] As an optional embodiment, a portion of the top plate 211 has filter slits 215, located close to the vertical plate 213 with the filter slits. That is, the filter slits on the top plate 211 do not cover the entire surface, but are located on one side close to the vertical plate 213 with the filter slits.

[0068] As an optional embodiment, the filter head has an extended backwashing range of 60 mm.

[0069] As an optional embodiment, the filter cap 21 is made of an aluminum-iron alloy.

[0070] As an optional embodiment, the mounting hole 214 is circular with a nominal diameter of 25 mm.

[0071] As an optional embodiment, the filter rod 22 is made of ABS engineering plastic or stainless steel. Stainless steel filter rods are interchangeable with plastic filter rods, thereby reducing product costs.

[0072] Taking the eccentric filter head of Example 1 as an example, the installation is performed as follows: The filter rod 12 is inserted into the mounting hole 115 of the filter cap 11 from top to bottom, and then the connector 13 pre-embedded on the filter plate 3 is screwed in. The upper periphery of the filter rod 12 has outwardly protruding anchor plates for anchoring the eccentric filter head. The filter rod 12 with threaded section is tightened in the connector 13, so that the filter rod 12 and the filter plate 3 play the role of fixing and stabilizing the filter cap 11. The lower part and the middle part of the filter rod 12 have slits and air holes. The middle part of the filter rod 12 is aligned with the cavity of the filter cap. Air and water enter from the slit and air hole at the lower part of the filter rod 12, rush out from the slit in the middle part, and then rush out through the filter slit on the filter cap 11 to wash the filter material.

[0073] After the eccentric filter head assembly is completed, the filter media in the water treatment plant's filter tank or filter bed is cleaned, addressing beam marks, plate marks, and dead zones in the filter plates. The eccentric filter head is then installed based on the sludge accumulation areas from backwashing. (See [link / reference]). Figure 10 The upper part is filter plate 3, and the bottom support is filter beam 4. There are two types of eccentric filter head installation. One type has eccentric filter heads installed on both sides of filter plate 3 at filter beam 4, with short vertical plates with filter slots facing each other. See [link to relevant documentation]. Figure 11 and 12 Another method involves installing eccentric filter heads and ABS plastic filter heads on both sides of the filter plate 3 at filter beam 4. The eccentric filter heads and ABS plastic filter heads are arranged alternately on each side. Each row of eccentric filter heads has a short vertical plate with filter slots opposite to the ABS plastic filter heads. (See [link]). Figure 11 and 13 The filter plate 3, away from the filter beam 4, can be equipped with conventional filter heads, such as ABS plastic filter heads, or eccentric filter heads. After the eccentric filter heads are installed, a leveling test should be performed on all filter heads in the filter bed. After the leveling test is passed, a whole-bed air flushing test should be performed on the eccentric filter heads. After passing the test, the filter bed should be put into water treatment filtration operation to eliminate the backwash dead zone of the filter bed or filter bed, thereby solving problems such as sludge accumulation and caking in the filter bed.

[0074] Depend on Figure 14 and 15 It can be seen that the original center distance between the filter heads on both sides of the ultra-wide filter beam was 250mm, and the traces at the beam channel were obvious. After the eccentric filter head was modified, the center distance between the filter heads for water and air distribution was reduced, the traces at the beam channel were reduced or even disappeared, the filter media sludge accumulation and clumping caused by the dead zone of filter beam filtration and backwashing disappeared, and the backwashing effect was good.

[0075] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An eccentric filter head for water treatment, comprising a filter cap, a filter rod, and a connector, wherein the filter cap is a hollow geometric body formed by a top plate, a bottom plate, and a vertical plate, the vertical plate has a filter slit, and the top plate and bottom plate have through-holes, characterized in that: The mounting holes are offset from the geometric center. The filter rod passes through the upper and lower mounting holes and is connected by a connector. The filter cap can rotate around the filter rod, causing the filter cap to rotate eccentrically. The filter slot is opened on the circumferential vertical plate at the far end of the hole.

2. The filter head according to claim 1, characterized in that: The filter slits are opened vertically.

3. The filter head according to claim 1, characterized in that: The filter slit width is 0.3–0.4 mm, the length is 25 mm, and the error is within ±0.03 mm.

4. The filter head according to claim 1, characterized in that: The total area of ​​the filter slits in the filter cap is 3.0–4.0 cm². 2 .

5. The filter head according to claim 1, characterized in that: The backwashing range of the filter head is 30-60 mm.

6. The filter head according to claim 1, characterized in that: The filter cap is made of plastic, metal or alloy.

7. The filter head according to claim 1, characterized in that: The filter rod is made of plastic, metal or alloy.

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