CN215538685U

CN215538685U - Zero-power filter material automatic backflow device of siphon filter tank

Info

Publication number: CN215538685U
Application number: CN202120376278.4U
Authority: CN
Inventors: 孙长贵; 姚中贵; 昝加春
Original assignee: Chengdu Sunriver Environment Technology Co ltd
Current assignee: Chengdu Sunriver Environment Technology Co ltd
Priority date: 2021-02-05
Filing date: 2021-02-05
Publication date: 2022-01-18
Anticipated expiration: 2031-02-05

Abstract

This patent has proposed the automatic reflux unit of zero power filter material of siphon filtering ponds, and it includes conical upper shield and telescopic annular awl down, and open all around on the upper portion of siphon tedge water inlet has a plurality of slotted holes, and the top of upper shield and awl down is sealed respectively to be fixed in the top and the below of siphon tedge slotted hole, and the bottom can be sealed the hookup between them and form detachable annular seal storehouse. The bottom of the lower cone is provided with a floating ball which can drive the lower part of the lower cone to stretch according to the water level of the backwashing water storage tank, so that the annular sealing bin can be opened and closed. When backwashing siphoning occurs, the filter material is brought into the siphoning ascending pipe and is deposited in the annular sealing bin; along with the continuous backwash siphon, the water level of the backwash reservoir is reduced, the floating ball drives the lower cone to move downwards to open the annular sealing bin, and the filter material in the annular sealing bin is taken out by water on the upper part of the siphon ascending pipe to form automatic zero-power filter material backflow. When the water level rises, the floating ball pushes the lower part of the lower cone to shrink, the annular sealing bin recovers sealing, and the siphon filtering tank recovers normal filtering operation.

Description

Zero-power filter material automatic backflow device of siphon filter tank

The technical field is as follows:

a zero-power filter material automatic backflow device of a siphon filter tank belongs to the field of water treatment.

Background art:

the company of the inventor proposes a double-filter integrated filter capable of siphoning and backwashing in an issued patent ZL201420489268.1, which comprises an outer filter tank and an inner filter barrel positioned in the center of the outer filter tank, wherein a backwashing water storage tank is positioned above the inner filter barrel, and a siphoning and backwashing pipe assembly is installed in the center of the top of the inner filter barrel; the two-stage filter tank adopts the same filter material with the volume weight larger than that of water, and the two filter tanks are communicated at the bottom; the influent water flows downwards and is filtered by the inner filter barrel, then flows upwards and is filtered by the outer filter tank, and then is stored in the backwashing water reservoir and is discharged after reaching a certain water level. The two-stage filter tank is mainly provided with two communication modes at the bottom, one mode is that the filter material and water can flow, and the other mode is that the water can flow but the filter material cannot flow. If the second mode is adopted, because the filtering area of the outer filtering tank of the double-filtering filter is generally larger than that of the inner filtering tank, when the filtering material of the inner filtering tank is fully backwashed, the filtering material of the outer filtering tank often cannot reach enough backwashing strength, and the backwashing expansion rate is not high, so that enough backwashing is difficult to obtain, the phenomena of penetration, caking and the like of the outer filtering tank can occur after the filter material is operated for a period of time, manual periodical backwashing is needed, the maintenance workload is large, and the labor intensity is high. If adopt first mode, during siphon backwash each time, the filter material of interior filtering ponds takes place the inflation, can drive outer filtering ponds bottom filter material and to the inside filtering ponds bottom removal to progressively raise interior filtering ponds filter material thickness. When the thickness of the filter material in the inner filter tank is large enough to ensure that the inner filter tank is not enough to keep enough expansion space (about 45 percent of quartz sand), a considerable part of the filter material is taken out from the siphon pipe as long as siphon backwashing is carried out. Certainly, the taken filter material can be manually paved on the surface of the outer filter tank again to form filter material manual auxiliary circulation, but the labor intensity is also higher.

In fact, any siphon filter tank may be faced with similar situations, when the thickness of the filter material layer is too large, and the expansion space in the filter tank is insufficient, the problem that the filter material is brought out by siphon backwashing can occur.

Patent CN201710880141.0 and other patents propose various filter material recycling devices, but basically consider how the filter material is collected after being taken out, and there is no solution for spreading the filter material after being directly collected to a filter tank.

An active sand filter is available in the market at present, and the filter material at the bottom of a filter tank is cleaned by external power such as a water pump or a fan and then gradually transferred to the top of the filter tank, so that the filter material in the filter tank is cleaned and circulated up and down. But this method requires a large external power and power consumption.

The utility model has the following contents:

the utility model provides a zero-power filter material automatic backflow device of a siphon filter tank, which comprises a circular lower cone and a conical upper cover, wherein the filter tank of the siphon filter tank is arranged in the middle of a backwashing impounding reservoir, and a siphon backwashing device is provided with a vertical siphon ascending pipe and is characterized in that: a plurality of notches are formed on the periphery of the upper part of the water inlet of the siphon ascending pipe; the upper cover and the lower cone are both opened downwards, the tops of the upper cover and the lower cone are respectively and coaxially arranged above and below the notch, and the lower ends of the upper cover and the lower cone are in internal and external sealing connection; the lower cone is telescopic, and the bottom of the lower cone is fixedly connected with at least one floating ball.

The guiding idea of the patent is that a detachable annular sealing bin is additionally arranged outside the upper part of a water inlet of a siphon ascending pipe. At least one floating ball is fixed at the bottom of the annular seal bin and is positioned basically near the damage water level of the backwashing water reservoir. Its sectional area is several times greater than the rising area of siphon water flow, so that when the siphon water flow is passed through said sectional area, its flow speed is obviously reduced, and the filter material is settled in said ring-shaped sealed cabin. When the backwashing water level is reduced to a backwashing damage water level, the floating ball can be lowered to open the annular sealed bin, fatal siphon damage can be caused, water in the siphon ascending pipe can be rapidly lowered, the filter material in the annular sealed bin is paved in the outer filter tank again or is returned to the position near the bottom of the siphon filter tank, and the filter material is brought to the bottom of the filter tank during siphon backwashing to form filter material collection and paving; when the water level rises, the floating ball rises to close the annular sealing bin. By adopting the method, the filter material can realize automatic backflow through the siphon backwashing power.

If the wall thickness is neglected. Establish the diameter of siphon downcomer, upper shield and be D and D respectively, the velocity of flow of corresponding intraductal water of siphon during backwash is V and V respectively, and during then siphon backwash, the flow through the siphon downcomer should be equal with the intraductal flow through annular seal storehouse and siphon riser, promptly:

d^{^2}*v＝(D^{^2}-d^{^2})*V

according to relevant design specifications, v is 1 m/s. According to the hydraulics test, the free settling velocity of the quartz sand used as the filter material is about 0.3 m/s. If V is 0.3 m/s, then D^{^2}＝4.3d^{^2}I.e., D > 2.1D. I.e. the diameter of the upper housing should be at least 2.1 times the diameter of the siphon downcomer.

The annular sealing bin consists of an annular lower cone and a conical upper cover. The upper part of the water inlet of the siphon ascending pipe is provided with a plurality of slots around, so that the siphon ascending pipe is communicated with the annular sealed cabin through water and forms basically the same flow speed. In order to form a reliable and effective seal between the upper cover and the bottom of the lower cone, the lower cone and the upper cover should be coaxially mounted, e.g. both coaxially mounted on the siphon riser: the top of the upper cover is coaxially and hermetically arranged above the slotted hole of the siphon ascending pipe, the top of the lower cone is coaxially and hermetically fixedly arranged below the slotted hole of the siphon ascending pipe, and the upper cover and the lower cone are hermetically connected at the bottom to form an annular sealed bin. Both are coaxially arranged on the siphon ascending pipe, so that the upper cover and the lower cone keep a certain coaxiality. Because the periphery of the siphon ascending pipe between the upper cover and the lower cone is provided with a plurality of slot holes, the water flow speed in the annular sealing bin and the siphon ascending pipe can be basically the same; in order to ensure that the deposition of the filter material in the annular sealed bin is axisymmetric, the arrangement of the slotted holes is also axisymmetric. The lower cone can be telescopic, the bottom of the lower cone is fixedly connected with at least 1 floating ball (or buoy), in order to ensure that the lower cone moves axially symmetrically, the floating ball is also arranged symmetrically with the lower cone, and if an annular floating ball is adopted, the annular floating ball is also basically coaxially sleeved on the siphon ascending pipe.

One is that the lower cone can stretch up and down, the lower cone is made of flexible plastic or hard cloth with certain rigidity, and the up-and-down movement of the floating ball can directly drive the bottom of the lower cone to move up and down, so that the lower cone stretches up and down. The other is that the lower cone can be extended and contracted radially, for example, it is made of flexible material with radial skeleton, and the skeleton is connected with another skeleton by means of hinge, and then connected with a sliding ring which can be slided up and down on the siphon riser. The up-and-down movement of the floating ball drives the sliding ring to move up and down firstly, so that the lower cone makes radial telescopic movement through the framework; the radial expansion makes it and the bottom of the upper cover form an annular sealing chamber. When siphon backwashing is carried out, the water level of the backwashing reservoir is reduced; when the water level drops below the top of the floating ball, the buoyancy of the floating ball gradually drops; when the filter material falls to a certain height, the gravity of the lower cone is larger than the buoyancy, the lower cone can drive the annular sealing bin to open a gap under the combined action of the gravity of the floating ball and the gravity of the precipitated filter material (in the siphon process, negative pressure can be generated in the top of the siphon inclined pipe, and therefore, almost no water gravity exists), and therefore the gap is air-inlet to destroy the backwashing siphon. Once the siphon is broken, the water in the siphon ascending pipe or even the siphon inclined pipe can be quickly descended, so that the gap is quickly enlarged, and the filter material precipitated in the annular sealing bin is taken out, thereby realizing the backflow and the paving of the filter material. After the backwash siphon is broken, the filtration is restored, the water level in the backwash reservoir gradually rises, and the water level in the siphon riser pipe also rises synchronously, generally, the water level is slightly higher than the water level in the backwash reservoir. Because the water inlet of the siphon ascending pipe is arranged below the floating ball, when water begins to be recovered, as long as the floating ball is higher than the water inlet of the siphon ascending pipe by a certain height, the water level in the siphon ascending pipe is not higher than the top of the lower cone. Along with the rising of the water level in the backwashing water storage tank, the floating ball is correspondingly lifted, so that the bottom of the lower cone is upwards contracted, the lower cone is connected with the upper cover in a sealing way, and the filtering tank is ensured to be normally operated.

And in the outward-extending type siphon backwashing device, a siphon inclined pipe is arranged on the siphon ascending pipe, the top of the upper cover is opened, and the siphon inclined pipe is coaxially and hermetically fixed near the top of the siphon ascending pipe. For the central coaxial siphon backwashing device, a siphon inclined pipe is not arranged, and a siphon descending pipe and a siphon auxiliary pipe are arranged in a siphon ascending pipe, so that the upper cover can adopt a top sealing mode. The upper cover and the siphon ascending pipe can be designed into a threaded connection mode, and the upper cover can be manually rotated to move up and down to serve as an auxiliary mode for opening and closing the annular sealing bin.

In order to facilitate the automatic sliding of the filter material, the lower cone should have a certain cone angle, and the bottom angle of the lower cone should be larger than the stable angle of the filter material.

The coupling between the upper cover and the lower cone can adopt a direct contact sealing mode, and a sealing rubber ring can be arranged between the upper cover and the lower cone. Generally, a sealing rubber ring can increase the sealing performance and reduce the direct friction between two parts, and is a better choice.

Obviously, this patent can be fit for taking the siphon filtering ponds of the coaxial siphon device in central authorities, including the integrative filter of two straining of one-level filtering ponds or bottom UNICOM. For the latter, when siphon backwashing is generated each time, the filter material in the inner filter tank expands, and meanwhile, the filter material at the bottom of the outer filter tank is brought into the bottom of the inner filter tank by high-speed water flow, so that the thickness of a filter layer of the inner filter tank is increased; when the expansion space of the filter material in the inner filter tank is insufficient, the siphon backwash water flow can bring part of the filter material on the surface layer of the inner filter tank into the siphon riser and collect the filter material in the filter material reflux device; when the siphon is broken, the filter material collected in the filter material reflux device is spread on the surface layer of the outer filter tank to form the circulating reflux of the filter material. In fact, for the double-filtration integrated filter, the sectional area of the outer filtration tank is generally several times larger than that of the inner filtration tank. When the siphon backwashing strength is designed according to the inner filter tank, the backwashing strength of the outer filter tank is also reduced by times, and an expansion space cannot be obtained, so that the outer filter tank cannot be really and effectively backwashed only by the siphon backwashing of the inner filter tank. After the filter material backflow device is installed, part of filter materials are circularly refluxed once every time of backwashing, so that an intermittent active sand filter is formed.

The particle filter material has multiple functions of physical filtration, biological net capture and the like, and particularly, when the designed filtration speed of the external filter tank is low (such as less than 0.3 m/h), a biological membrane can be formed in the filter material. By adopting the technology, the filter material layer of the outer filter tank can be kept with certain stability, and the filter material of the outer filter tank can be backwashed circularly and hierarchically. Compared with a traditional continuous active sand filter, the intermittent active sand filter has better filtering effect, completely depends on full hydraulic force to realize filter material backflow, can realize automatic backflow of the filter material as long as automatic siphon backwashing can be realized, does not need to increase other power, and can realize intermittent automatic backflow of the filter material with zero power.

Description of the drawings:

fig. 1 and 2 are a front view and a plan view, respectively, of an embodiment design, and fig. 1 is a half sectional view. FIG. 3 is a view showing the installation position of the embodiment of the present patent in a siphon filtration tank.

The specific implementation mode is as follows:

such as the embodiment shown in figures 1 and 2. The siphon ascending pipe 1 of the central coaxial siphon device is made of a stainless steel pipe, a plurality of through slot holes 6 are formed in the periphery of the upper part of the stainless steel pipe, and the slot holes 6 are formed by laser cutting; a circular plate 7 is welded in an inner tube hole at the top of the siphon, and a nut 8 is welded at the center of the circular plate 7, so that the nut 8 is coaxial with the siphon riser 1. The lower cone 3 is made of PE plastic and is formed into a cone shape capable of stretching up and down, and a large cone opening of the lower cone is provided with a flange 13 so as to fixedly install the floating ball 11. The bottom cone angle of the lower cone 3 is about 50 degrees and is close to the stable stacking angle of the quartz sand filter material; the upper part of the siphon riser pipe is glued below the slotted hole 6 on the siphon riser pipe 1 and is reinforced by a stainless steel throat hoop 14. The floating ball 11 is an annular buoy with an inner hole slightly larger than the outer diameter of the siphon ascending pipe 1 and is made of polyurethane foam; the compressible characteristic is utilized, and the glue is pressed into the flanging 13 at the bottom of the cone 3 after being coated; the installation position is a certain distance above the water inlet 12 of the siphon riser 1 so that the floating ball 11 moves up and down.

The upper cover 4 is formed by transparent ABS injection molding, the top of the upper cover is sealed, a stainless steel screw 9 is embedded when the inner side of the top is injected with the injection molding, and the screw 9 is inserted into the nut 8; the upper cover 4 can be moved up and down by manually rotating the upper cover 4 for manual intervention in special situations, so as to adjust the tightness of the contact of the upper cover 4 and the lower cone 3. The bottom of the upper cover 4 is sleeved with a special silica gel sealing ring 2, and the inner side of the sealing ring 2 is provided with an annular flange, so that the lower cone 3 can better ensure the sealing with the upper cover 4 to form an annular sealing bin 5.

In order to facilitate manual rotation of the upper cover 4, a plurality of strip flanges 10 are uniformly distributed on the outer side of the upper cover 4 and used for increasing the holding power during rotation. These flanges 10 can be realized when the upper casing 4 is injection-moulded.

The automatic filter material backflow device is installed on a siphon ascending pipe 1 of a siphon filter tank 20, the filter tank 21 is located in the center of a backwashing water storage tank 23, and the siphon ascending pipe 1 is arranged at the top of the center of the filter tank 21.

When the siphon filter tank 20 is in normal filtering operation, the water level in the backwashing reservoir 23 is higher than the whole floating ball 11, and under the buoyancy action of the floating ball 11, the bottom of the lower cone 3 is tightly pressed on the sealing ring 2 at the bottom of the upper cover 4 to seal the annular sealing bin 5; since the float 11 is substantially coaxial with the siphon-lift 1, its buoyancy should also be coaxial and the seal should be uniform. Along with the continuous filtration, the filter material blocks gradually, the water level in the siphon ascending pipe 1 rises gradually, and the annular sealed bin 5 is filled with water.

After the backwashing siphon is generated, negative pressure appears at the top of the siphon ascending pipe 1, so that water in the siphon ascending pipe 1 flows upwards, and partial filter material 22 is driven to flow along with the water. When the ascending water flow passes through the slotted hole 6, the flow cross section area is multiplied by more than 4 times, the flow velocity is gradually reduced from 1 m/s to less than 0.3 m/s, the sedimentation velocity of the quartz sand filter material 22 flowing along with the water is greater than the ascending flow velocity along with the water, and the filter material 22 is sedimentated above the lower cone 3 in the annular sealing bin 5.

Along with the continuous backwashing siphoning, the water in the annular sealed bin 5 can be gradually cleared, meanwhile, the water level in the backwashing water reservoir 23 can be gradually reduced, and the sediment filter materials 22 in the annular sealed bin 5 can be gradually increased; when the water level drops to a certain height of the floating ball 11, the buoyancy and the negative pressure in the siphon ascending pipe 1 are not enough to support the water pressure in the siphon ascending pipe 1 and the gravity of the sediment filter material 22, the bottom of the lower cone 3 extends downwards to open the annular sealing bin 5; air ingress (water level has dropped below) and fatal backwash siphon breaks. After the siphon is broken, the negative pressure on the top of the siphon ascending pipe 1 disappears, the water above the siphon ascending pipe can fall freely, the water pressure borne by the lower cone 3 is increased instantly, the bottom of the siphon ascending pipe is fatal to move downwards quickly, and the water flow drives the filter material 22 deposited on the lower cone 3 to flow back to the bottom of the backwashing reservoir 23.

After the backwashing siphon is broken, the filtering function of the siphon filtering tank 20 is recovered, the water inlet 12 is filled with water to gradually raise the water level of the backwashing water reservoir 23, and the buoyancy of the floating ball 11 is gradually raised. At the moment, no water is stored in the annular sealed bin 5, and no sediment filter material exists basically. The buoyancy rise will quickly cause the lower cone 3 to contract upwards, and the annular sealing bin 5 is sealed again. Thereby restoring the filtering operation of the entire siphon filtration tank 20.

Since the upper cover 4 can be rotated to move up and down, the sealing state between the upper cover 4 and the lower cone 3 can be adjusted by the upper cover 4, and the tightness of the seal can be adjusted by rotating the upper cover 4 if necessary. The user can observe the collection condition of the filter materials 22 in the annular sealed bin 5 through the transparent ABS upper cover 4; when the filter material 22 is found to be more, the back-washing siphon is still not generated, and the upper cover 4 can also be rotated upwards to move upwards, so that the filter material 22 in the annular sealed bin 5 automatically slides downwards under the driving of the stored water because the bottom cone angle of the lower cone 3 is large and is close to the stable angle of the quartz sand when the annular sealed bin 5 is opened, and then flows back to the bottom of the filter tank 21. After the filter material 22 basically flows back, the rotary upper cover 4 is backwashed to move downwards, so that the annular sealing bin 5 is closed again, and the filtering operation can be recovered. The filter material can be started to flow back manually and forcibly. Because the upper cover 4 rotates when moving downwards, the rotation is beneficial to removing the filter material 22 possibly remaining on the sealing ring 2, and the sealing of the annular sealing bin 5 can be better ensured.

Adopt this patent, just can actually be when backwash siphon at every turn, with the bottom of filtering ponds 21 is transferred to automatically in batches to filtering materials 22 on filtering ponds 21 top, realize intermittent type formula active sand effect. The siphon filter tank 20 can automatically siphon and back wash without any external power, so that zero power is automatically completed.

Claims

1. The utility model provides a zero power filter material automatic reflux unit of siphon filtering ponds, includes that the annular is down awl, conical upper shield down, and the filtering ponds of siphon filtering ponds are installed at the middle part of backwash cistern, and its siphon backwash device has vertically siphon tedge, characterized by: a plurality of slot holes are formed on the periphery of the upper part of the water inlet of the siphon ascending pipe; the upper cover and the lower cone are both opened downwards, the tops of the upper cover and the lower cone are respectively and coaxially arranged above and below the slotted hole, and the lower ends of the upper cover and the lower cone are connected in an internal-external sealing way; the lower cone is telescopic, and the bottom of the lower cone is fixedly connected with at least one floating ball.

2. The zero-power automatic filter material backflow device of a siphon filter tank as claimed in claim 1, characterized in that: a sealing ring is arranged between the lower cone and the upper cover, and the lower cone and the upper cover form an annular sealing bin through the sealing ring.

3. The automatic filter material return device for a siphon filter tank of claim 2, wherein: the siphon filter tank adopts a central coaxial siphon backwashing device, the top of the upper cover is sealed, and the top of the upper cover is installed on the top end of the siphon riser through threads.