CN204159086U - A kind of Continuous Flow sand filter - Google Patents

Abstract

The utility model provides a continuous flow sand filter, which solves the problem of high maintenance cost of the existing flow sand filter. Including casing, water inlet channel, water inlet main pipe, water distributor and center pipe, the lower end of the center pipe is connected with an air lift pump, and the upper end is connected with a sand washer. And the outer casing, the outer wall of the inner casing and the inner wall of the outer casing are provided with spirally distributed protrusions, the outer wall of the inner casing and the outer casing are connected by a central plate, and a water outlet seam is opened on the central plate. The opening at the end is set in the water collection container on the top of the sand washer, the water collection container is connected with the clean water outlet pipe and the sewage discharge pipe, the air lift pump is set in the bottom cone bucket, the bottom cone bucket is fixed in the shell, and the bottom cone bucket A sand guiding bucket is arranged between the bucket and the water distributor. The utility model makes a spiral passage between the inner casing and the outer casing by setting protrusions, which is convenient for checking and repairing the sand washer, is beneficial to save maintenance costs, and improves the utilization rate of the device.

Description

A continuous flow sand filter

technical field

The utility model relates to the field of sewage treatment, in particular to a quicksand filter.

Background technique

In recent years, due to the increasingly serious pollution of domestic water bodies, the Chinese government has formulated increasingly stringent requirements for sewage discharge and reuse. Many sewage treatment plants are facing upgrading from Grade B to Grade A. During this process , various crafts and technologies are competing to use. Active sand filtration process and technology occupy an increasingly important position in the municipal sewage advanced treatment process due to its advantages of low one-time investment cost, no need for backwashing system, and low operation and maintenance costs.

In addition, with the outbreak of "cyanobacteria" incidents in the Taihu Lake Basin, the government and people from all walks of life have become more and more aware of the harm of nitrogen and phosphorus pollution to natural water bodies. Transformation" has become an increasingly urgent task. Due to the lack of nitrification and denitrification process in some sewage treatment facilities or unstable and reliable operation, the ammonia nitrogen or total nitrogen in the final biochemical effluent is still maintained at a high level.

The continuous flow sand filter with nitrification and denitrification functions is the best solution for "standard improvement" to further remove ammonia nitrogen or total nitrogen; and relying on flocculation reaction and its own physical and chemical separation function, continuous flow sand filter can also treat wastewater Phosphorus is removed to a very low level. The effectiveness of these denitrification and phosphorus removal makes the continuous flow sand filter widely used in the "standard improvement" of municipal wastewater. At the same time, during the whole denitrification and phosphorus removal process, the strong self-cleaning and filtering effect of the continuous quicksand filter itself can make the suspended matter and turbidity of the effluent obtain a very low level.

However, a major defect of the existing quicksand filter is high cost. The main reason is that most of the components are integral structures, which need to be replaced as a whole after damage, resulting in high maintenance costs. For example: the sand washing machine is mainly composed of inner helical tube and outer helical tube. In long-term use, the inner helical tube and outer helical tube are easy to wear, resulting in poor treatment effect, and the whole inner helical tube and outer helical tube need to be replaced during maintenance. Spiral pipe, resulting in high maintenance costs.

In addition, the sand washing effect of the spiral channel of the existing sand washing device is poor, causing the suspended solids to be removed to return to the system repeatedly with the flowing sand, affecting the water discharge effect.

Utility model content

The utility model provides a continuous flow sand filter, which solves the problem of high maintenance cost of the flow sand filter in the prior art.

The technical solution of the utility model is achieved in the following way: a continuous flowing sand filter, including a casing, the casing is connected with the water inlet channel, the water inlet channel is connected with the water inlet main pipe, the lower end of the water inlet main pipe is connected with the water distributor, and the water distributor The water outlet is upward, and there is a central pipe in the water inlet main pipe. The lower end of the central pipe is connected with an air lift pump, and the upper end is connected with a sand washer. The outer wall of the inner casing and the inner wall of the outer casing are provided with spirally distributed protrusions. The outer wall of the inner casing and the outer casing are connected by a central plate. Set in the water collection container on the top of the sand washer, the upper end of the water collection container is connected with the clean water outlet pipe, the lower end is connected with the sewage drainage pipe, the air lift pump is set in the bottom cone bucket, the bottom cone bucket is fixed in the shell, the bottom cone bucket A sand guiding bucket is arranged between the bucket and the water distributor.

The lower end of the sand guide bucket is provided with four support devices, the support device includes a support frame with a triangular cross section, and a U-shaped support is provided on the triangular support frame, the U-shaped support is connected with the lower edge of the sand guide bucket, and one side of the support frame In contact with the inner wall of the bottom cone.

The protrusion is a fixing plate with a triangular cross section.

The shell is provided with upper and lower sight mirrors, and a manhole is also set on the shell.

The water distributor is provided with eight water distribution branch pipes, and the eight water distribution branch pipes are evenly distributed on the water inlet main pipe.

The water collecting shell is fixed on the adjusting plate, and the adjusting plate is connected with the locking knob.

The bottom cone bucket is composed of eight isosceles trapezoidal plates, the lower end of the trapezoidal plates is arranged on the bottom of the shell, and the upper part of the trapezoidal plates is arranged on the inner wall of the trapezoidal plates.

In the utility model, the spiral channel is formed between the inner casing and the outer casing by setting the protrusions, which facilitates the maintenance of the sand washer without affecting the operation of the sand washer. When the protrusions are worn out, only the protrusions need to be replaced That is, there is no need to replace the entire sand washer, and it is not necessary to frequently replace the inner casing and the outer casing. It is beneficial to save the maintenance cost and improve the utilization rate of the device. When the filter medium passes through the spiral channel, the turbulent state of the medium is intensified, so that the active sand is separated from the intercepted suspended matter, and the effect of removing suspended matter is achieved. In addition, the inner casing and the connected air lift pump system can be lifted and inspected separately, which is convenient for inspection and repair of the sand washer, central sand lifting pipe and sand lifting device. The setting of the spiral channel improves the separation of active sand and suspended matter, and improves the system processing efficiency by more than 20%. The sand lifting system can be lifted separately for maintenance, which is beneficial to save maintenance costs, improve device utilization and prolong device service life.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the structural representation of the utility model;

FIG. 2 is a schematic top view of FIG. 1 .

Figure 3 is a schematic top view of the bottom cone bucket.

Figure 4 is an enlarged schematic view of the sand washer.

FIG. 5 is a schematic top view of FIG. 4 .

Fig. 6 is a schematic structural view of the supporting device.

Among them: 1. Shell, 2. Inlet channel, 3. Inlet main pipe, 4. Water distributor, 4-1. Water distribution branch pipe, 5. Bottom cone bucket, 6. Support device, 7. Air lift pump, 8. Center pipe, 9. Sand washer, 9-1. Water collection shell, 9-2. Inner casing, 9-3. Outer casing, 9-4, protrusion, 9-5. Water collection container, 9-6 .Central plate, 9-7. Water outlet joint, 10. Clean water outlet pipe, 11. Sewage drain pipe, 12. Sand guide bucket, 13. Support frame, 14. U-shaped support piece, 15. Manhole, 16. Viewing Mirror, 17. regulating plate, 18. trapezoidal plate.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

As shown in Figures 1 to 6, a continuous flow sand filter includes a casing 1, the casing 1 is connected to the water inlet channel 2, the water inlet channel 2 is connected to the water inlet main pipe 3, and the lower end of the water inlet main pipe 3 is connected to the water distributor 4, The water outlet of the water distributor 4 is upward, the main water inlet 3 is provided with a central pipe 8, the lower end of the central pipe 8 is connected with an air lift pump 7, and the upper end is connected with a sand washer 9, and the sand washer 9 includes a water collecting shell 9-1 , the water collecting shell 9-1 is provided with an inner casing 9-2 and an outer casing 9-3, and the outer wall of the inner casing 9-2 and the inner wall of the outer casing 9-3 are provided with spirally distributed protrusions 9- 4. The outer wall of the inner casing 9-2 and the outer casing 9-3 are connected by a central plate 9-6, and the central plate 9-6 is provided with a water outlet seam 9-7, and the opening at the end of the water inlet main pipe 3 is set at In the water collection container 9-5 at the top of the sand washer 9, the upper end of the water collection container 9-5 is connected with the clean water outlet pipe 10, and the lower end is connected with the sewage discharge pipe 11. The air lift pump 7 is arranged in the bottom cone bucket 5, and the bottom The cone bucket 5 is fixed in the casing 1, and a sand guide bucket 12 is arranged between the bottom cone bucket 5 and the water distributor 4.

The central pipe 8 and the inner casing 9-2 connected with the air lift pump 7 and the sand washer at its lower end can be conveniently raised without dismantling other components.

The sand washer 9 includes an inner sleeve 9-2, an outer sleeve 9-3 and a protrusion 9-4. The protrusion 9-4 is arranged in a spiral shape. When the filter sand descends through the labyrinth of the protrusion, the filter sand is forced to Do vortex movement, and at the same time meet the rising filtrate flow, the impurities in the filter sand will be washed away, and flow out with the rising cleaning water.

When the utility model is used, filter sand material is placed in the filter, and its main operating principles are as follows: 1. Raw water filtration: raw water enters the filter through the water inlet main pipe 3, and is evenly sprayed upwards through the water distributor 4, and the water is upwards. The reverse flow filter material layer reduces the pollutant content in the water; at the same time, the pollutant content in the quartz sand filter material increases, and the pollutant content of the lower filter material layer is higher than that of the upper filter material. The filtered water is discharged from the clean water outlet pipe 10 by gravity flow. 2. Filter material cleaning: the filter sand at the bottom of the filter is lifted by the air lift pump 7 to the sand washer 9 at the top of the filter, and the dirty particles are separated from the active sand by turbulent flow, and the impurities are discharged. The filter sand falls back to the upper layer of the sand bed, and the circulation of the sand is carried out in the center pipe 8 .

Since the quartz sand filter material is in a top-to-bottom motion state in the filter, it agitates the raw water, so the agitation and flocculation can be completed in the filter. The filter material in the filter is cleaned in time and can withstand high concentration of pollutants in the water. When the mixture leaves the outlet of the air lift pump, the velocity drops and the filter sand will fall into the sand washer. The impurities in the filter sand will be discharged from the washing water drain along with the sand washing water. The amount of filter sand sucked into the air lift pump is controlled by controlling the air flow. Greater airflow will lift more filter sand and vice versa.

As preferably, the lower end of the sand guide bucket 12 is provided with four support devices 6, the support device 6 includes a support frame 13 with a triangular cross section, and a U-shaped support 14 is arranged on the support frame 13, and the U-shaped support 14 is connected with the guide. The lower edge of the sand bucket 12 is connected by bolts, and one side of the support frame 13 is in contact with the inner wall of the bottom cone bucket 5 . The support device 6 can better fix the sand guide bucket 12, and when the sand guide bucket 12 or the fixing device 6 fails, it is easier to overhaul and any part can be replaced, reducing the maintenance cost.

The protrusion 9-4 is a fixed plate with a triangular cross section, and the protrusion 9-4 is fixed on the inner casing 9-2 and the outer casing 9-3 through bolt connection. Moving up and down, it is easy to wear and tear the protrusions. The utility model separates the protrusions from the inner casing 9-2 and the outer casing 9-3 and adopts a movable connection design, which is more convenient for the maintenance of the sand washer and reduces the maintenance cost.

The casing 1 is provided with upper and lower viewing mirrors 16 , and the casing 1 is also provided with a manhole 15 . The inner condition of the filter can be observed in time through the sight glass 16, and the device can be easily checked and repaired through the manhole 15.

As shown in FIG. 5 , preferably, the water distributor 4 is provided with eight water distribution branch pipes 4 - 1 , and the eight water distribution branch pipes 4 - 1 are evenly distributed on the water inlet main pipe 3 . This setting method makes the water distribution more uniform, which is conducive to improving the decontamination effect.

As a further preference, the water collecting shell 9-1 is fixed on the adjusting plate 17, and the adjusting plate 17 is connected with the locking knob. The wash water flow is generated by the level difference between the filtrate level in the filter and the level control vessel. The pressure difference created by the head difference will push a small portion of the filtrate.

As shown in FIG. 3 , the bottom cone bucket 5 is composed of eight isosceles trapezoidal plates 18 , the lower end of the trapezoidal plates 18 is arranged at the bottom of the shell 1 , and the top of the trapezoidal plates 18 is arranged on the inner wall of the trapezoidal plates. This design mode is convenient for the assembly and maintenance of the bottom cone bucket 5 .

In the utility model, filtration and sand washing are carried out at the same time, there is no need to stop and backwash, and the power consumption is low, the system does not need maintenance, the management is simple, and it can be unattended.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in the Within the protection scope of the present utility model.

Claims (7)

1. A continuous flow sand filter, comprising a shell (1), the shell (1) is connected with the water inlet (2), it is characterized in that: the water inlet (2) is connected with the water inlet main (3), and the water inlet (3) ) is connected to the water distributor (4), the water outlet of the water distributor (4) is upward, the central pipe (8) is arranged in the water inlet main pipe (3), and the lower end of the central pipe (8) is connected with an air lift pump ( 7), the upper end is connected with a sand washer (9), and the sand washer (9) includes a water collection shell (9-1), and the water collection shell (9-1) is provided with an inner casing (9-2) and an outer casing The pipe (9-3), the outer wall of the inner casing (9-2) and the inner wall of the outer casing (9-3) are provided with spirally distributed protrusions (9-4), and the inner casing (9-2) The outer wall and the outer casing (9-3) are connected by a central plate (9-6), and a water outlet joint (9-7) is opened on the central plate (9-6), and the opening at the end of the water inlet main pipe (3) Set in the water collection container (9-5) on the top of the sand washer (9), the upper end of the water collection container (9-5) is connected with the clean water outlet pipe (10), the lower end is connected with the sewage drain pipe (11), and the air The lifting pump (7) is set in the bottom cone bucket (5), the bottom cone bucket (5) is fixed in the casing (1), and a sand guide bucket (12 ). 2. The continuous flow sand filter according to claim 1, characterized in that: the lower end of the sand guide bucket (12) is provided with four support devices (6), and the support device (6) includes a triangular support frame in cross section (13), the triangular support frame (13) is provided with a U-shaped support (14), the U-shaped support (14) links to each other with the lower edge of the sand guide bucket (12), and one side of the support frame (13) is connected to the bottom cone bucket ( 5) Inner wall contact. 3. The continuous sand filter according to claim 1, characterized in that: the protrusion (9-4) is a fixed plate with a triangular cross section. 4. The continuous flowing sand filter according to any one of claims 1 to 3, characterized in that: the casing (1) is provided with two viewing mirrors (16) up and down, and the casing 1 is also provided with manholes (15) . 5. The continuous flowing sand filter according to claim 4, characterized in that: the water distributor (4) is provided with eight water distribution branch pipes (4-1), eight water distribution branch pipes (4-1) Evenly distributed on the water inlet main pipe (3). 6. The continuous sand filter according to claim 5, characterized in that: the water collecting shell (9-1) is fixed on an adjustment plate (17), and the adjustment plate (17) is connected with a locking knob. 7. The continuous flow sand filter according to claim 6, characterized in that: the bottom cone bucket (5) is made up of eight isosceles trapezoidal plates (18), and the lower end of the trapezoidal plates (18) is arranged on the casing (1 ) bottom, the top of the trapezoidal plate (18) is arranged on the inner wall of the trapezoidal plate.