JPS621415A - Sand filter apparatus - Google Patents

Abstract

PURPOSE:To enhance the separation effect of the suspended substance adhered to filter sand, by mounting a conical deflector to the upper end of the rising pipe at the center of a sand filter apparatus for permitting the passage of raw water to a horizontal direction and receiving the same in a revolving tank having a conical shape throttled at the lower part thereof. CONSTITUTION:Raw water enters a raw water chamber 30 from a supply port 14 and further passes through a filter chamber 31 wherein coarse filter sand is arranged in the side of an outer support wall 2 and fine filter sand in the side of an inner support wall 3 and, at this time, the suspended substance of raw water is collected in a size order. Clarified water reaches a water collection chamber 32 and subsequently fallen through the water collection chamber 32 to take a U-turn to be flowed to a drain chamber 34 and a drain port 15. A slight amount of filter sand is accumulated in a sedimentation cylinder 6 while the filter sand 31 in the filter chamber 31 is tumbled on the bottom 51 thereof to rise through a rising pipe 8 and discharged in a revolving tank 9 through a conical deflector. A revolving stream is generated in the revolving tank 9 by emitted water and sand is fallen downwardly to be tumbled on an upper chute 10 and reaches the filter chamber 31.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an improvement in a device for filtering a liquid horizontally through a sand filter layer to obtain clear filtration.

[Conventional technology]

As a means of obtaining clear water through sand filtration, Patent No. 155.7
The disclosure is in No. 56, but in recent years, it has been disclosed in
A typical example is Special Publication No. 51-34587.

What these all have in common is the following.

■ An outer wall, an inner wall, and a water collection chamber inside the inner wall are installed concentrically in the tank, and filtration is carried out between the outer wall and the inner wall! Contaminated water flows through the tank.

■ The filled filter sand descends, the water pressure rises in the pipe inside the water collection chamber using air, and the filter sand in the filter sand layer moves downward.

■ Openings are provided in the outer and inner walls to allow contaminated water and clear water to pass through, but to support the filter sand that forms the filter sand layer.

■ The gold in the pipe rises and the filtered sand rolls down the chute below the pipe outlet, or directly sinks into the water on the upper surface of the filtered sand layer O through holes. Due to the rolling action of the filter sand, there is a tendency for the distribution to be divided into coarse grains and fine grains.

■ The suspended solids (including large and small contaminants) captured by the filter sand are removed from the water surface and out of the system. In particular, some have a gutter-shaped overflow gutter that also improves the rectification effect.

From these explanations, the following can be understood.

By passing water across the filter sand layer, the sand layer traps suspended matter and clear water can be obtained. This operation involves separating suspended matter from the sand and removing it while the sand is being circulated.

[Problem that the invention seeks to solve]

These sand filters have several technical drawbacks.
This is because highly clear water could not be obtained, that is, the separation effect between filter sand and suspended matter was not good.

Furthermore, returning the filter sand requires the use of water from outside the system or an air system, which does not meet the requirements of compact size and easy operation.

q! In the case of tVc blowing Alr, fine bubbles adhere to the filter sand, which inhibits the settling and transfer of the filter sand, and because they float, they are lost together with the water containing suspended matter. The elliptical water surface is displaced due to fluctuations in the amount and pressure of contaminated water being supplied, and during the initial and final stages of operation, 7 tons of filtered sand is mixed into the clear water, and because it is dry sand, air comes into contact with it. Because of this, air bubbles may adhere to the sand and cause the following state to occur and the flow to flow away.

Therefore, an object of the present invention is to provide a sand filtration device that is compact in construction and that can obtain highly clear water at low cost through simple operation.

A further object is to provide a sand filtration device that eliminates loss of sand, obtains a large amount of effective clear water regardless of the quality of the water that circulates the sand, and is suitable for a variety of uses.

[Means for solving problems]

In order to achieve this purpose, the amount of raw water inflow is adjusted appropriately, and the filter sand is forcibly washed and separated by swirling flow.
It is characterized by appropriately removing scum floating on the water surface. An outer support wall and an inner support wall through which water can pass are provided in the tank body below the cylindrical outer wall, and filter sand is filled between these walls. Three concentric pipes are installed inside the inner support wall to form a raw water chamber, a filtration chamber, a water collection chamber, a discharge chamber, a retention chamber, and a rising pipe from the tank body side. Water in the rising pipe is introduced into the center of the swirling tank in the upper chamber in the upper area of the tank body by the air lift, and the filter sand filled in is also supplied at the same time. When supplied to the swirling tank so as to generate a swirling flow, filter sand and suspended matter are separated. The filter sand is deposited again by rolling the upper chute into the filter chamber.

The suspended solids become highly concentrated polluted water and are discharged outside the tank. The scum floating on the water surface in the upper chamber flows into a vertically movable funnel and is discharged out of the tank along with the polluted water.

The tank body is further provided with an overflow pipe that communicates with the raw water chamber to keep the amount of raw water passing through the outer supporting wall constant, and a sand settling chamber is provided below the inner supporting wall to drain the sand. [Example] The appearance of the present invention will be briefly explained with reference to Figs. 1 to 3.

A ladder 38 with a safety frame 37 is fixed to the tank body 1 and fixed to the floor 40 via a support 39.

A handrail 41 is provided above the tank body 1 and a ladder 38 is provided.
A water collection mass 42 and an overflow port 29 are provided, and a discharge port 15, a discharge port 16, a suction port 43. Discharge port 44, air supply port 19t
- Provide. Below the tank body 1, there are provided a supply port 14 for raw water that is contaminated and contains a lot of suspended matter, a drain pipe 17, and a nozzle 45 that serves both for water supply and sand discharge.

FIG. 4 shows a schematic configuration of the present invention, and the detailed configuration will be explained in FIGS. 5 to 14.

In FIG. 4, the tank body 1 has a vertical cylindrical shape, and may be a cylindrical or polygonal cylinder. are provided approximately concentrically. Below the inner support wall 3 is a sink IIRfrJ6.
and lower, -) one is appropriately fixed to the tank body 1 with a support 4 or the like, and a drain pipe 17 communicating with the sedimentation cylinder 6 is led out of the tank Mf1 and a valve 18 is provided.

A separation pipe 46 is provided between the rising pipe 8 and the water collection pipe 5, and the partition @4
A discharge chamber 34 is formed around the tank body 1 and the outer support wall 2, the space formed by the tank body 1 and the outer support wall 2 is defined as the Gensuiko 30, and the space formed by the outer support wall 2 and the inner support wall 3 is defined as the filtration chamber 31, and the filter sand is filtered with a filter medium. Fill 13. Similarly, the space formed by the inner support wall 3 and the water collection tube 5 is called a water collection chamber 32, the space formed by the water collection tube 5 and the partition tube 46 is called a discharge chamber 34, and the space formed by the partition tube 46 and the rising pipe 8 is called a retention chamber. 47.

Above the partition 46 are an upper shoe) 10 and a rotating tank 9t''.
A discharge port 44, a discharge pipe 27, a flow meter 23, a valve 21, and a check valve 22 are provided in communication with the pump 20.

One side of the swirling tank 9 is provided in communication with a discharge port via a discharge pipe 48, and a 7-anel 1lt is provided in the middle of the discharge pipe 48 in series via a telescopic pipe 121c.

An air chamber 50 is provided at the lower side of the rising pipe 8 extending from the center lower side of the tank body 1 toward the center of the rotating tank 9, and a conduit 49 communicating with the air supply port 19 through 50 feet of the air chamber is arranged.

A valve 24 and a flow meter 25 are provided in the water supply pipe 28 in communication with the above-mentioned valve 21 and connected to the nozzle 45, so that the pump 20 and the lower end of the riser pipe 8 and the filtration chamber 31 are communicated with each other.

Inside the tank body 1, an upper chamber 36, a filtration chamber 31, and a lower chamber 35 are arranged in this order from the top, and the lower surface of the tank body 1 has a bottom 51 in the form of a seven-annel shape narrowing toward the center.

Next, the upper chamber 36 section of the 8A's structure of the present invention will be explained based on FIG.

The outer shell of the rotating tank 9 has a cylinder 52 at the top and a funnel-shaped cone 53 at the lower part, and an umbrella 54, a chute 55, and a water collecting tube 56 are provided inside the outer shell concentrically with the rotating tank 9.

The rising pipe 8 is provided to pass through the cone 53, the water collecting pipe 56, and the chute 55, and the diameter of the lowermost part of the cone 53 is made larger than the row diameter of the rising pipe 8 to provide a gap 58.

The discharge water is spread and discharged below the upper end discharge part 57Fi of the riser pipe 8 and the umbrella 54, and the structure is such that the sand particles easily flow out from between the umbrella 54 and the chute 55 to the surrounding area.

A discharge port 591 of the discharge pipe 27 opens in the tangential direction of the inner wall of the cylinder 52 .

On the other hand, the discharge pipe 60 passes through the water collecting pipe 56 and the cylinder 52 and is connected to the discharge pipe 48.
The discharge port 16 is provided so as to penetrate through the discharge port 16 and communicate with the discharge port 16.

Note that the exhaust pipe 60 is equipped with a pipe 84 which is always open to the atmosphere.
A siphon breaker is used, and the discharge port 59 is configured to discharge downward at an angle of 3 to 10 degrees.

The upper chamber 36 of the tank body 1 is provided with the above-mentioned swirl tank 9 and seven annels 11t, and the funnel 11 will be described next.

Raw water is introduced into the raw water source 30 by a pump, by gravity flow, or by a combination of these methods.

Then, a water surface A61 is formed in the upper chamber 36, and when the filtration operation is started, scum floats near the surface layer of the water surface. A round funnel 11 is provided to efficiently follow and remove this scum from the surface layer.
The position can be adjusted and fixed.

Since the annel 11 and the discharge pipe 48 communicate with each other via the telescopic pipe 12, the funnel 11 can freely follow the water surface A61 by vertical movement of the slot/dol 63.

On the other hand, a full flow pipe 65i communicating with the raw water chamber 30 is provided and a spout 120 is provided in the water collection mass 42 so that the weir plate 66't overflows from the water surface person 61 to form a water surface B67i. It goes without saying that the weir plate 66 is equipped with fins that adjust the level of the water surface ^61 and rectify the flow.
In the water collection mass 42, the thorn layer water of the royal house 36 and the surplus water of the raw water are combined to form a water surface B67t-, which collects at the overflow port 29.
Allow water to flow elsewhere.

In addition, various considerations have been made so that even if the rotating tank 9 + discharge pipe 48 or the funnel 11 are fixed to the tank closing day 1, they can be easily removed.

It is 7-yen A68, Franz B69, screw jointer 70. This is a threaded joint B71, etc., and in particular, the Franz 68 fixes the pipe seat on the tank closing day 1, and then fastens the fixed Franz to the pipe of the discharge port 16 with a screw through a gasket, so it requires only one assembly. And the entire structure is easy to disassemble and maintain.

The configuration around the filtration chamber 310 will be described in more detail based on FIGS. 6 to 9.

The flow of raw water is represented by the arrow Wa=Wg, the flow of the filtered sand is represented by the arrows S&~S., and the flow of water and the filtered sand is represented by the mixed flow W-. This flow will be described later together with the configuration.

The outer support wall 2 is provided with a plurality of parts as shown in FIG. 7.8, each consisting of a clapboard 72 and a hole 73. The arcuate plate 72 has a folded plate-like cross section, and the plate 72 is provided on the filtration chamber 31 side, and a hole 73 is provided above the elevation line 75 of α1 from the horizontal line 76 in contact with the lower end 77.

α1 is not constant depending on the shape and quality of the filtered sand, the flow rate of water discharged from the lower end 77, the pressure, etc., but is approximately 25 to 45 degrees. The Tomohara water passes through the hole 73 and accumulates for 174 tons, reaches the lower end 77 along the clapboard 72, and flows from this area into the filtration chamber 3.
1.

FIG. 9 shows a cross section of the inner support wall 3 portion.

The filtration chamber 31 is filled with filter sand 13 that becomes finer as it goes inward, and is separated from the water collection chamber 32 by the inner support wall 3. A configuration that does not allow water to pass through, but allows only water to pass through, is rare. In the present invention, as an example shown in FIG. 9, a structure having a substantially triangular cross-section and a nine-percent screen shape is illustrated in which the void 80 on the outer surface 78 is made smaller and the void 81 on the inner surface 79 is enlarged. In this case, as the gap 80 is made smaller, the filter sand 13 will not pass through even fine grains, and the distance between the gap 80 and the gap 81 will be drastically increased.
3 doesn't get stuck.

As another example, the inner support wall 3 may be formed of porous ceramic, or a material with pores that communicate with water, such as activated carbon, may be used for better filtration effects. Especially the outer surface 7
The gaps 80 of 8 are likely to be clogged with the filter sand 13 and bridges are likely to occur due to the water pressure and the soil pressure of the filter sand, forming a secondary screen. Due to this clogging and bridging phenomenon, suspended solids are further trapped here and form a tertiary screen, reducing the throughput of raw water. This phenomenon occurs depending on the quality of the raw water or sand, so if you apply vibrations from a hexameter or ultrasonic waves to the inner support wall 3, it will cause a secondary screen,
Tertiary screens can be avoided. Although not shown in the drawings, if these are included, the effect will be further enhanced.

FIG. 10 is a detailed view of the part that obtains discharged water to the swirling tank 9.
A trumpet-shaped suction port 82 is fixed to the tip.

There are many suspended substances floating near the water surface of the upper chamber 36, and the lower part of the upper chamber is the area where the filtered sand 13 settles, so the area directly above this settling area of the suction port 8211 is pest. be.

With the opening 83 of the suction port 82 facing this position, the suction pipe 26
The water is collected and pumped by the pump 20.

The suction tube 26 is fixed using the same method as the flange member 68, as described above.

Based on FIG. 11, the vicinity of the lower chamber 35 of the tank closing day 1 will be described in detail.

Below the filtration chamber 31, there is an i-shaped bottom with a bottom part of 9.
A gap 85 is provided at the upper end of the inner support wall 3 so as not to contact the sedimentation cylinder 6, and a gap 85 is provided at the lower end thereof so as not to contact the bottom 51. The lower part of the sedimentation cylinder 6 is narrowed inward so that the fine filtered sand 13 can be stored therein, and nine bottoms 87 are provided and fixed to the partition cylinder 46 to prevent communication with the lower chamber 35.

The riser pipe 8 is provided inside the vortex pipe 46, and a retention chamber 47 is provided to prevent the water quality in the discharge chamber 34 from changing even if the riser pipe 8 is removed.

An air chamber 50t is provided outside the riser pipe 8 and communicates with the air conduit 49, and a pore 88t communicates between the air chamber 50 and the inside of the riser pipe 8.
- By providing a plurality of holes, air with equal pressure and flow rate can pass through all the holes 88 and ventilate into the riser pipe 8.

A water supply pipe 28 communicating with the pump 20 is provided with a flange 89 at the center at the lowest part of the bottom 51 so as to face the discharge port 90 so that the water floats the sand 92 accumulated therein.

FIG. 12 shows the raw water supply area, and FIG. 13 shows the area opposite to the center of tank 2 and day 1 in FIG. 12.

A raw water supply port 14 is provided in the tank 2 day 1 and the raw water chamber 30 is installed.
Allow raw water to enter. It is provided on a body plate 95 that is approximately parallel to the inner surface 93 of the tank 2-day 1 and goes around once, and a disk 94 is used to connect and fix the space between them. In this way, a cylindrical space 96 is formed. The lower end '97 of the space 96 is open to the raw water chamber 30, but an arcuate plate 98 is provided only near the supply port 14 to close the hole 7.
Direct current to the position 99 is completely avoided, and a uniform flow is made even to the opposing position 99.

If the cross-sectional area of the space 96 increases as it goes from the supply port 14 to the opposing position 99, a uniform pressure and flow rate will be achieved in the raw water chamber 30. In addition, the circular arc plate 98 at the bottom of the space 96 is made to go around once, and the number of holes tfc
The same effect can be obtained by selecting the pore size.

The movements of water, suspended matter, and filtered sand will be fully explained based on FIGS. 5 to 13.

The raw water contaminated with suspended matter enters the space 96 from the supply port 14 and fills the raw water chamber 30 from the lower end 97 with uniform flow rate and pressure.

The raw water that has passed through the holes 73 in the outer support wall 2 is rectified by the clapboard 72 so that it flows downward, and the filled filter sand 13 is held at the angle of repose at the elevation line 75.

Outer support wall 21! Larger filter sand is placed on the side A, and smaller filter sand is placed on the inner support wall 3 side, so that while passing through these large gaps and reaching the small gaps, the suspended matter in the raw water decreases in size. are captured in this order.

The suspension moves as indicated by the arrows Wa+wb and IWe+ shown in FIG. 6, and the suspended matter is removed, and the clear water passes through the gap 80.degree. 81 of the inner support wall 3 and reaches the water collection chamber 32. Arrows Wd and W・
make a movement.

Next, the movement of the clear water and the filtered sand 13 will be explained based on FIG.

Collected water 132i descends to arrow Wf, U in sedimentation @ 6
Turn and reach the discharge chamber 34. It is shown by arrow Wg. Then, an arrow W1 leading from the arrow wh shown in FIG. 6 to the discharge port 15
Clear water flows in the direction of.

Since a small amount of filtered sand passes through the inner support wall 3 together with clear water, this sand is deposited as precipitated sand 91 in the settling cylinder 6.

FIG. 4 shows a configuration in which the filter sand 13 and water are moved by a circulating flow. When the pump 20 is operated, the water in the upper chamber 36 is sucked in through the suction port 82, passes through the suction pipe 26, and one part goes to the swirling tank 9. , one side is fed under pressure to a discharge port 90 provided at the bottom of the tongue laminate 1.

The amount of water to be pumped is controlled by each valve 21, 24' and detected by a flow meter 23, 25, and the backflow valve 22 is operated to prevent the contaminated water in the swirling tank 9 from flowing back and contaminating the upper chamber 36. It is provided.

The riser pipe 8 is filled with water, and when air is discharged into the riser pipe 8 through the air conduit 49, air chamber 50, and pores,
The bubbles rise in the riser pipe 8, and this upward flow generates an upward flow in the water filled with the air.

On the other hand, the filtration sand 13 in the filtration chamber 31 is falling from the gap 85, 86 of the lower chute 7 to a small mouse as indicated by the arrow sg.

Sf) rolls on the bottom 51 and becomes deposited sand 92 in the lower area.

Due to the flow velocity in the riser pipe 8, the accumulated sand 92 is floated as shown by the arrow s.
In the direction of the h force, the filtration sand rises.

The suspended matter in the raw water captured in the filtration chamber 13 gets lost in the downward movement of the filtration sand 13 and descends, and most of it is contained in the deposited sand 92 and rises in the riser pipe 8 (as indicated by the arrow) WS) is filtered by water, air, filtered sand, and suspended matter.

Depending on the degree of contamination and amount of the deposited sand 92, or in order to prevent consolidation of the filtered sand, water is discharged from the #-i discharge chamber 90 when purifying the entire lower chamber 35 by generating a jet flow.

This discharged water is very effective and has the effect of reliably securing the gaps 85 and 86, and has the effect of removing slime deposits that grow on the inner surface of the lower door 7 and the outer periphery of the settling tube 6.

This will be effective whether the pump 20 and valve 24 are operated when the amount of raw water to be processed is down, or whether they are operated periodically.
This is an effective means for obtaining clear water while keeping the amount of treatment constant.

The settling sand 91 in the settling cylinder 6 is removed by operating the valve 18 periodically or when replacing the filtered sand 13.

Rising polluted water (arrow ws) h is ejected from the discharge port 57 of the rising W8, air bubbles are released to the atmosphere, and water, sand, and suspended matter are discharged into the swirling tank 9 via the umbrella 54 and the sheet 55. .

A swirling flow is generated on the inner surfaces of the cylinder 52 and the cone 53 by the water discharged from the discharge port 59 of the swirling tank 9 . The closer to the inside, the more fine particles or f'ia pollutants gather and are discharged to the outside of the system via the water collecting cylinder 56 and the discharge pipe 60. Since coarse sand (St) gathers closer to the outside, the sand falls (sb) downward from the gap 58 between the cone 53 and the riser pipe 8.

The fallen filter sand rolls on the upper seam 10 as shown by the arrow Sa in FIG. Forms the angle of repose underwater. While passing through the arrow Sd+S@, the coarse filtered sand continues to be transferred and gathers on the outer support wall 2 side.

The configuration in which the coarse particles gather on the side of the outer support wall 2 provides the greatest effect as a sand filtration process. If coarse-grained filter sand is used as the primary screen to trap suspended matter, large suspended matter will be trapped in the gaps between the sand and a secondary screen will be formed. Because of this, no tertiary screen is formed. Therefore, if the flow velocity for sand filtration is not fast and the raw water quality is the same, the amount of sand to be filled can be reduced, and the filtration chamber can also be made into a conductor.

Does the raw water flowing into the raw water chamber 30 pass through the outer support wall 2?
Excess raw water in the direction of the arrows shown in FIGS.
Divides the flow so that it ejects from 0.

This branch flow uses a pump or gravity as a means for supplying the raw water to the supply port 14, but is effective in keeping the supply amount and supply pressure to the space 96 of the raw water chamber 30 constant. Therefore, it is possible to easily secure the set amount and pressure of raw water to the space 96.

Furthermore, if the filtration operation is continued and the inside of the filtration chamber 31 becomes clogged, and any of the other pipes become clogged, the space 9 becomes clogged.
If the supply to 6 is not stopped, trouble will occur, but if this diversion method is used, the raw water will automatically be spouted from the spout 120, allowing safe operation.

〔Effect of the invention〕

The sand filtration device of the present invention ideally arranges the grain size of the filter sand for filtration, and cleans the filter sand at three locations: the lower end, the inside of the rising pipe, and the swirling tank, so it adheres to the sand. The effect of separating 7 from suspended matter and suspended matter mixed in the filter sand is the dog.

A means is provided to remove concentrated telekinetically turbid water and scum including suspended matter from the entire system, and water for sand washing is taken out from the upper chamber and circulated internally, which has the effect of effectively utilizing water.

Highly clear water can be obtained using a compact and simple filtration device, which is more efficient in terms of time and economy.

[Brief explanation of drawings]

Fig. 1 is an external front view of the present invention, Fig. 2 is a side view showing a person in the direction of arrow A in Fig. 1, Fig. 3 is a plan view shown in Fig. The figures show the schematic structure of the present invention, FIG. 5 is a detailed view showing the upper chamber part of FIG. 4, and FIG.
Figure 7 is a detailed three-dimensional view showing the hole in the outer support wall 2, Figure 8 is a detailed view showing the cross section of the hole in the outer support wall 2, and Figure 9 is the inner support wall. A detailed view showing a cross section of three parts, and FIG. 10 is a detailed view of a part that obtains water discharged to the swirling tank 9. FIG. 11 is a diagram showing the vicinity of the lower chamber of the tank body 1, and FIG.
The figure shows the raw water supply port, Figure 13 shows the part opposite to Figure 12, 1: Tank body, 2: Outer support wall, 3: Inner support wall, 9: Swivel tank, 11:7 Anel, 12: Telescopic pipe, 13: Sand, 14:
Supply port, 15: Discharge port, 20: Bonde, 30: Raw water chamber,
31: Filtration chamber, 32: Water collection chamber, 33: Precipitation chamber, 34: Discharge chamber, 35: Lower chamber, 36 Upper chamber, 52: Cylinder, 53: Cone, 54: Umbrella, 74: Retention chamber, 96 :space. n clapboard 77 lower end 82 suction 073 hole outer surface of box 83 open lower 4 retention chamber inner surface pipe 75 elevation line (a) void 76 water line 81 void No. 11 Figure 85 void 93 inner surface void % disk 87 bottom 95 Body plate 88 pores % Space width Flange 97 Lower end beautiful discharge port Circular arc plate 91 Sedimentation sand 99 Opposing position 92 Sedimentation sand ] 0:l Upper plate Fig. 7 Fig. 8 Fig. 12 Fig. 13

Claims (1)

[Scope of Claims] 1. An outer support wall, an inner support wall, a water collection pipe, a partition pipe, and a rising pipe are provided concentrically from the outside to the inside in a vertically cylindrical tank body, and the tank body The space formed by the outer supporting wall and the outer circumferential surface of the outer supporting wall is used as a raw water chamber, the space formed between the outer supporting wall and the inner supporting wall is used as a filtration chamber, and is filled with sand, and the space formed by the inner supporting wall and the outer circumferential surface of the water collecting cylinder is used as a water collecting chamber. The space formed by the water collection chamber and the outer circumferential surface of the bulkhead is the discharge chamber, the space formed by the bulkhead and the outer circumferential surface of the riser pipe and the filtration chamber communicate with each other downwardly, and an upper chamber is provided above the tank body. In the sand filtration device, the riser pipe extends to the upper part of the tank body, and a cone-shaped umbrella that spreads downward is attached to the upper end of the riser pipe. A sand filtration device characterized by being provided with a rotating tank whose upper part is cylindrical and whose lower part is conical with a lower aperture for storing the umbrella and the upper part of the riser pipe. 2. The sand according to claim 1, characterized in that a funnel is mounted on the horizontal surface of the upper chamber so that its position can be adjusted, a telescopic pipe is connected below the funnel, and a discharge pipe is connected below the telescopic pipe. Filtration device. 3. The lower chamber is formed by a lower chute that expands downward and the bottom of the tank body, and a sedimentation tube that communicates with the water collection chamber is provided in the lower chamber, and a valve is installed in the drain pipe that passes through this sedimentation tube and the bottom of the tank body. A sand filtration device according to claim 1, characterized in that it is provided with: