CN115779513A

CN115779513A - M underdrain and filtering ponds

Info

Publication number: CN115779513A
Application number: CN202211736790.0A
Authority: CN
Inventors: 于亚军; 王先键; 李孟娟
Original assignee: Henan Weilan Water Treatment Technology Co ltd
Current assignee: Henan Weilan Water Treatment Technology Co ltd
Priority date: 2022-12-30
Filing date: 2022-12-30
Publication date: 2023-03-14

Abstract

The invention belongs to the field of underdrains for water purification systems, and particularly relates to an M underdrain and a filter tank, wherein the M underdrain comprises an inner-layer distributor and an outer-layer distributor, the inner-layer distributor surrounds an inner cavity of the M underdrain, water distribution and air distribution holes for passing water and air are formed in the inner-layer distributor, the outer-layer distributor is a filter layer made of a filter material which is permeable to water and air and impermeable to sand, so that a filter material can be directly paved outside the M underdrain, the inner-layer distributor and the outer-layer distributor are arranged at intervals to form a distribution cavity between the inner-layer distributor and the outer-layer distributor, the outer-layer distributor is impermeable to sand, a supporting layer is not required to be arranged, the height and cost investment of the filter tank are reduced, dead-corner-free backwashing on the filter material is realized during backwashing, the backwashing effect is improved, and the backwashing time is shortened.

Description

M underdrain and filtering ponds

Technical Field

The invention belongs to the field of underdrains for water purification systems, and particularly relates to an M underdrain and a filter tank.

Background

The bottom of a filter tank of the water filter system is provided with a water and gas distribution device, water filtered by the filter material permeates into the water and gas distribution device during filtering, then the water and the gas are gathered and flow out, when the filter material needs to be backwashed, the backwashed water and gas are introduced into the water and gas distribution device, and the backwashed water and the gas reversely flow to the filter material through the water and gas distribution device to wash the filter material.

The water and gas distribution device is mostly a filter plate filter head, a multifunctional filter pipe, an M-shaped underdrain and the like, the underdrain is taken as an example, the structure of the filter brick is a 360-degree filter brick disclosed by the Chinese utility model patent with the publication number of CN210251425U and the publication number of 2020, 04.07.04.A, when the filter brick is used, the filter brick is arranged at the bottom of a pool body to form the underdrain, the filter brick is provided with an inner cavity communicated along the length direction, and the filter brick is also provided with water and gas distribution holes communicated with the outside of the filter brick and the inner cavity, so that backflushing gas and backflushing water can be discharged from the inner cavity of the filter brick during backflushing. Firstly, the water and air distribution holes arranged on the water and air distribution device are large, in order to prevent filter materials from entering the water and air distribution device, a bearing layer with the thickness of at least 100mm or even a bearing layer with the thickness of 450mm is required to be arranged on the water and air distribution device, and the filter materials are laid on the bearing layer, so that the height of the filter tank is directly increased, and the investment and operation cost is also increased. The second point is that the water and gas distributing holes on the existing water and gas distributing devices are distributed in a multi-point mode, the distance between each point and the corresponding water and gas distributing hole is about 50mm-100mm, and the filter materials between the points cannot be effectively washed. When the filter material backwashing device is operated for a long time, the backwashing of the filter material is not thorough, the hardening is caused for a long time, and the pool stopping and maintenance are seriously needed.

Therefore, a novel underdrain needs to be designed to solve the technical problems that the height of a filter tank is high, the investment and operation cost is high and dead angles are large when filter materials are backwashed due to the fact that a supporting layer needs to be laid on the underdrain in the prior art.

Disclosure of Invention

The invention aims to provide an M-shaped underdrain, which aims to solve the technical problems that in the prior art, a supporting layer needs to be laid on the upper side of the M-shaped underdrain when the M-shaped underdrain is used, so that the height of a filter tank and the investment and operation cost are high, and dead angles are large when filter materials are backwashed; the invention also aims to provide a filter tank using the M underdrain.

In order to achieve the purpose, the technical scheme of the M underdrain provided by the invention is as follows:

the utility model provides a filter material can directly be laid outside the M underdrain, and inlayer distributor and outer distributor interval arrangement form the distribution chamber between inlayer distributor and outer distributor that M underdrain includes inlayer distributor and outer distributor, and the inner chamber of M underdrain is enclosed into to the inlayer distributor, offers the water distribution gas distribution hole that is used for the water to cross gas on the inlayer distributor, and outer distributor is the filter layer of making by the filter media that permeates water and breathe freely but not permeate sand for the inlayer distributor is outer.

The beneficial effects are that: the outer layer of the M underdrain is a filter layer made of a filter material which is permeable to water and air and impermeable to sand, so that a filter material can be directly paved on the M underdrain without paving a supporting layer, the height and cost investment of the filter tank are reduced, during filtering, water filtered by the filter material directly enters the distribution cavity from the outer distribution body and then enters the cavity surrounded by the inner distribution body, when the filter material needs to be backwashed, backwash water and backwash air are introduced into the cavity surrounded by the inner distribution body, the backwash water and the backwash air enter the distribution cavity through the water distribution holes in the inner distribution body, the backwash water and the backwash air in the distribution cavity can backwash the filter material through the outer distribution body, and the outer distribution body is made of the filter material, so that the whole body can permeate the backwash water and the backwash air, dead-corner-free backwash of the filter material is realized, the backwash effect is improved, the running cost of the filter tank is further reduced when the backwash water and the backwash air are shortened, and the backwash air is firstly introduced into the distribution holes through the water distribution holes, and the water distribution holes can be distributed in a point-like to offset the problem of uneven distribution of backwash water and backwash air.

As a further improvement, the cross section of the inner layer split ligand is in one of a trapezoid shape, a semicircular shape, a horseshoe shape and a triangular shape or a combination of more than two of the trapezoid shape, the semicircular shape, the horseshoe shape and the triangular shape.

The beneficial effects are that: the cross section of the inner layer sub-ligand is designed into one or the combination of more than two of trapezoid, semicircle, horseshoe and triangle, so that more water and air distribution holes can be arranged on the inner layer sub-ligand.

As a further improvement, the cross-sectional shape of the outer layer ligand is the same as the cross-sectional shape of the inner layer ligand.

The beneficial effects are that: the cross section shape of the outer layer partial ligand is the same as that of the inner layer partial ligand, so that the outer layer partial ligand and the inner layer partial ligand are convenient to match, the distribution cavity is regular in shape, and the flow resistance of backwashing water and backwashing gas is reduced.

As a further improvement, the inner-layer distributing body comprises a surrounding plate and a bottom plate, the surrounding plate and the bottom plate are matched to form an inner cavity of the M-shaped closed conduit, the water distribution and air distribution holes are formed in the surrounding plate, and the bottom plate is provided with fixing holes, so that the inner-layer distributing body can be fixed at the bottom of the pool body by penetrating fixing pieces in the fixing holes.

The beneficial effects are that: the M underdrain is simply and conveniently fixed at the bottom of the pool body.

In order to achieve the purpose, the technical scheme of the filter tank provided by the invention is as follows:

the utility model provides a filtering pond, includes the cell body and sets up the M underdrain in the cell body bottom, the M underdrain includes inlayer distributor and outer distributor, and the inner chamber of M underdrain is enclosed into to the inlayer distributor, offers the water distribution gas distribution hole that is used for crossing water gas on the inlayer distributor, and outer distributor is the filter layer of being made by the filter media that permeates water ventilative but not permeable to sand for the filter material can directly be laid outside the M underdrain, and inlayer distributor and outer distributor interval arrangement form the distribution chamber between inlayer distributor and outer distributor, filtering pond still includes the filter material of laying at M underdrain upside.

The beneficial effects are that: the cross section of the inner layer sub-ligand is designed into one or the combination of more than two of trapezoid, semicircle, horseshoe and triangle, so as to ensure that more water and air distribution holes can be arranged on the inner layer sub-ligand.

As a further improvement, the inner-layer distributing body comprises a surrounding plate and a bottom plate, the surrounding plate and the bottom plate are matched to form an inner cavity of the M-shaped closed conduit, the water distribution and air distribution holes are formed in the surrounding plate, fixing holes are formed in the bottom plate, and the inner-layer distributing body is fixed at the bottom of the pool body by penetrating fixing pieces in the fixing holes.

As a further improvement, the fixing part comprises a screw rod with one end fixed at the bottom of the pool, the other end of the screw rod penetrates through the fixing hole, an elastic pressing plate and a compression nut are sleeved on the part of the screw rod penetrating through the fixing hole, and the elastic pressing plate is matched with the bottom plates of the two inner-layer sub-assemblies which are arranged side by side.

The beneficial effects are that: therefore, one screw rod can complete the matching of two inner-layer sub-ligands at the same time, and the fixing structure of the M underdrain at the bottom of the tank body is simplified.

Drawings

FIG. 1 is a schematic cross-sectional view of a filtration tank according to example 1 of the present invention;

FIG. 2 is a schematic cross-sectional view of an M underdrain according to example 1 of the present invention;

FIG. 3 is an enlarged view of a portion A of FIG. 1;

FIG. 4 is a schematic cross-sectional view of an M underdrain according to example 2 of the present invention;

FIG. 5 is a schematic cross-sectional view of an M underdrain according to example 3 of the present invention;

fig. 6 is a schematic cross-sectional view of an M underdrain in example 4 of a filtration tank according to the present invention.

Description of reference numerals:

1. a tank body; 2. m, underdrains; 21. an inner layer split ligand; 211. a base plate; 212. enclosing plates; 213. water and air distribution holes; 22. an outer layer of ligand; 23. a distribution chamber; 3. filtering the material; 4. a screw; 5. an elastic pressure plate; 6. a compression nut; 31. an inner layer split ligand; 32. an outer layer ligand; 41. an inner layer split ligand; 42. an outer layer of ligand; 51. an inner layer split ligand; 52. the outer layer is partitioned into ligands.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration only, not by way of limitation, i.e., the embodiments described are intended as a selection of the best mode contemplated for carrying out the invention, not as a full mode. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, which may be present, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" or the like is not excluded from a process, method, or the like that includes the element.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.

In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the term "provided" may be used in a broad sense, for example, the object provided may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be detachable or non-detachable. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.

The present invention is described in further detail below with reference to examples.

The specific embodiment of the filter tank provided by the invention is as follows:

as shown in fig. 1, the filtering tank includes a tank body 1, an M-shaped underdrain 2,M is arranged at the bottom of the tank body 1, a filtering material 3 is laid on the upper side of the underdrain 2, when the filtering operation is performed, sewage on the upper side of the filtering material 3 permeates downwards, impurities in the water are filtered by the filtering material 3 and remain in the filtering material 3, and the water filtered by the filtering material 3 flows into the M-shaped underdrain 2 and converges downstream. The filter material 3 is sand with the grain diameter of more than 0.1 mm. The M-shaped underdrain described herein refers to a portion of the underdrain having an M-shaped cross-section, such that the M-shaped underdrains are arranged side-by-side to form an M-shape in cross-section.

The specific structure of the M-underdrain 2 is shown in fig. 2, and includes an inner layer sub-body 21 and an outer layer sub-body 22, the inner layer sub-body further includes a bottom plate 211 and a surrounding plate 212, and the bottom plate 211 and the surrounding plate 212 surround an inner cavity of the M-underdrain 2. The enclosing plate 212 is provided with water and gas distribution holes 213 (indicated by arrows in fig. 2) for passing water and gas, and the diameter of the water and gas distribution holes 213 is relatively large, so that the smooth passing of water and gas can be satisfied. The specific material of the inner layer sub-ligand 21 can be steel, plastic, FRP and other forms, so that the inner layer sub-ligand has good compression resistance, tensile resistance and corrosion resistance.

The outer portion of the ligand 22 is spaced apart from the inner portion of the ligand 21 to define a distribution chamber 23 therebetween. Specifically, the outer layer distributing body 22 is a filtering layer made of a filtering material, and the filtering material refers to a filtering material that can pass water and gas but not sand, and specifically, reference may be made to a filtering element of a water purifier and an air purifier in the prior art. The specific material of the outer layer ligand 22 may be steel, plastic, FRP, or other forms. The outer layer sub-body 22 is made of the filter material which passes through water and gas but does not pass through sand, so that the filtered water, the backwashing water and the backwashing gas can pass through the outer layer sub-body 22, and the filter material 3 can not pass through the outer layer sub-body 22, therefore, the filter material 3 can be directly laid on the upper side of the M underdrain 2 without additionally laying a bearing layer. The outer layer matching body 22 covers the outer side of the inner layer matching body 21, and the two can be relatively fixed through a bolt and nut component.

As shown in fig. 3, in order to fix the M underdrain 2 at the bottom of the tank, a fixing hole is formed in the bottom plate 211 of the inner-layer distributing body 21, a screw rod 4 penetrates through the fixing hole, one end of the screw rod 4 is fixed in the tank, the other end of the screw rod passes through the fixing hole, an elastic pressing plate 5 and a pressing nut 6 are sleeved on one end of the screw rod 4 extending out of the fixing hole, the pressing nut 6 is screwed downwards when the fixing is performed, the pressing nut 6 presses the elastic pressing plate 5 downwards, and the elastic pressing plate 5 is pressed on the bottom plate 211 of the inner-layer distributing body 21. In this embodiment, one elastic pressing plate 5 is simultaneously matched with the bottom plates 211 of the inner layer distributing bodies 21 on both sides, so that the shared fixing structure of the M underdrains 2 on both sides is realized, and the structure of the fixing structure is simplified.

As for the structure of the inner layer partial body 21, in this embodiment, the cross section of the inner layer partial body 21 is an isosceles trapezoid, and the cross section of the outer layer partial body 22 is identical to the cross section of the inner layer partial body 21.

During filtering, water penetrates downwards through the filter material 3, impurities in the water are deposited in the filter material 3, the filtered water enters the distribution cavity 23 through the outer-layer distribution body 22, and the water in the distribution cavity 23 enters the inner cavity surrounded by the bottom plate 211 and the enclosing plate 212 through the water distribution and air distribution holes 213. When the filter material 3 needs to be backwashed, the inner cavity enclosed by the bottom plate 211 and the enclosing plate 212 is filled with backwash water and backwash gas, the backwash water and the backwash gas enter the distribution cavity 23 through the water distribution and air distribution holes 213, the backwash water and the backwash gas are buffered in the distribution cavity and then permeate through the outer layer distributing body 22 to backwash the filter material 3, and the outer layer distributing body 22 is made of a filter material which is permeable to water and air but not permeable to sand, so that the backwash water and the backwash gas can permeate through the whole surface of the outer layer distributing body 22, and the filter material 3 is backwashed without dead angles. The distribution cavity 23 is arranged to counteract the problem of uneven distribution of the backwash water and the backwash gas caused by the point-shaped distribution of the water distribution holes 213, so that the backwash water and the backwash gas can be uniformly permeated out of the whole outer-layer distribution body 22.

The filter tank can be a nitrification filter tank, a denitrification filter tank, a V-shaped filter tank and a deep bed denitrification filter tank. Can also be transformed from other filter tanks.

The specific embodiment 2 of the filter tank provided by the invention is mainly different from the embodiment 1 in that: in example 1, the cross-sectional shape of the M-underdrain 2 is an isosceles trapezoid. In the present embodiment, as shown in fig. 4, the cross-sections of the inner layer distributing body 31 and the outer layer distributing body 32 are semicircular, so that the cross-sectional shape of the M underdrain is semicircular.

The specific embodiment 3 of the filter tank provided by the invention is mainly different from the embodiment 1 in that: in example 1, the cross-sectional shape of the M underdrain 2 is an isosceles trapezoid. In the present embodiment, as shown in fig. 5, the cross sections of the inner layer distributing body 41 and the outer layer distributing body 42 are isosceles trapezoid plus a bottom vertical section, so that the cross section of the M underdrain is shaped as an isosceles trapezoid plus a bottom vertical section.

The specific embodiment 4 of the filter tank provided by the invention is mainly different from the embodiment 1 in that: in example 1, the cross-sectional shape of the M underdrain 2 is an isosceles trapezoid. In the present embodiment, as shown in fig. 6, the cross-section of the inner layer partitioning body 51 and the outer layer partitioning body 52 is a horseshoe shape of a semicircle plus a bottom vertical section, so that the cross-sectional shape of the M-shaped underdrain is a horseshoe shape of a semicircle plus a bottom vertical section.

The specific embodiment 5 of the filtering tank provided by the invention is mainly different from the embodiment 1 in that: in example 1, the cross-sectional shape of the M underdrain 2 is an isosceles trapezoid. In this embodiment, the cross-sections of the inner layer of the ligands and the outer layer of the ligands are triangular, so that the cross-sectional shape of the M underdrains is triangular. Of course, in other embodiments, the cross-sectional shape of the inner layer ligand may be a combination of two or more of trapezoid, semicircle, horseshoe and triangle.

Embodiment of the invention M underdrain: the M underdrains in the invention are the same as the M underdrains in the embodiments of the filter tank, and are not described herein again.

Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and not intended to limit the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments without inventive effort, or some technical features of the present invention may be substituted with equivalents. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An M-shaped underdrain is characterized by comprising an inner-layer distributing body (21/31/41/51) and an outer-layer distributing body (22/32/42/52), wherein the inner-layer distributing body (21/31/41/51) surrounds an inner cavity of the M-shaped underdrain, water and air distribution holes (213) for passing water and air are formed in the inner-layer distributing body (21/31/41/51), the outer-layer distributing body (22/32/42/52) is a filter layer made of water and air permeable and sand impermeable filter materials, so that the filter materials can be directly paved outside the M-shaped underdrain, and the inner-layer distributing body (21/31/41/51) and the outer-layer distributing body (22/32/42/52) are arranged at intervals to form a distribution cavity (23) between the inner-layer distributing body and the outer-layer distributing body.

2. The M-underdrain of claim 1, wherein the cross-sectional shape of the inner layer distribution body (21/31/41/51) is one of a trapezoid, a semicircle, a horseshoe, a triangle, or a combination of two or more thereof.

3. The M underdrain of claim 2, wherein the cross-sectional shape of the outer layer distribution body (22/32/42/52) is the same as the cross-sectional shape of the inner layer distribution body (21/31/41/51).

4. The M underdrain of any one of claims 1-3, wherein the inner-layer distributing body (21/31/41/51) comprises a surrounding plate (212) and a bottom plate (211), the surrounding plate (212) and the bottom plate (211) cooperate to surround an inner cavity of the M underdrain, the water distribution and air distribution hole (213) is formed in the surrounding plate (212), and the bottom plate (211) is provided with a fixing hole, so that the inner-layer distributing body can be fixed at the bottom of the tank body by penetrating a fixing piece in the fixing hole.

5. A filter tank comprises a tank body and an M underdrain arranged at the bottom of the tank body, and is characterized in that the M underdrain comprises an inner layer distributing body (21/31/41/51) and an outer layer distributing body (22/32/42/52), the inner layer distributing body (21/31/41/51) encloses an inner cavity of the M underdrain, water distribution and air distribution holes (213) for water and air passing are formed in the inner layer distributing body (21/31/41/51), the outer layer distributing body (22/32/42/52) is a filter layer made of filter materials which are water permeable and air permeable but sand impermeable, so that filter materials can be directly paved outside the M underdrain, and the inner layer distributing body (21/31/41/51) and the outer layer distributing body (22/32/42/52) are arranged at intervals to form a distribution cavity (23) between the inner layer distributing body and the outer layer distributing body, and further comprises a filter material (3) paved on the upper side of the M underdrain.

6. A filter tank according to claim 5, wherein the cross-sectional shape of the inner layer ligand (21/31/41/51) is one of trapezoid, semicircle, horseshoe, triangle or a combination of two or more.

7. A filtration tank according to claim 6, wherein the cross-sectional shape of the outer layer ligand (22/32/42/52) is the same as the cross-sectional shape of the inner layer ligand (21/31/41/51).

8. A filter tank according to any one of claims 5 to 7, wherein the inner layer distributing body (21/31/41/51) comprises a surrounding plate (212) and a bottom plate (211), the surrounding plate (212) and the bottom plate (211) are matched to form an inner cavity of an M-shaped channel, the water and air distributing holes (213) are formed in the surrounding plate (212), and fixing holes are formed in the bottom plate (211) so that the inner layer distributing body can be fixed at the bottom of the tank body by penetrating fixing pieces in the fixing holes.

9. A filter tank according to claim 8, characterized in that the fixing member comprises a screw rod (4) with one end fixed on the tank bottom, the other end of the screw rod (4) passes through the fixing hole, an elastic pressing plate (5) and a compression nut (6) are sleeved on the part of the screw rod passing through the fixing hole, and the elastic pressing plate (5) is simultaneously matched with the bottom plates (211) of the two inner-layer distributing bodies (21/31/41/51) which are arranged side by side.