JP4440679B2 - Moving bed sand filter and method for inserting / removing air lift pipe - Google Patents

Description

  The present invention relates to a moving bed type sand filter and a method for inserting and removing an air lift pipe thereof.

Conventionally, as a moving bed type sand filtration device, filter sand that forms a filter bed is accommodated in a cylindrical tank, and raw water is continuously supplied from the lower part of the filter bed, and at the same time, sand filter is used to contaminate the filtered sand. Is known that can be continuously operated with an air lift pipe and continuously operated (see, for example, Patent Documents 1, 2, 3, and 4).
Japanese Patent Publication No. 56-51808 Japanese Utility Model Publication No. 62-59111 JP-A-10-71305 JP 2001-162109 A

However, the conventional moving bed type sand filtration apparatus has a problem that a dead space is generated around the apparatus because the filtration tank is formed by a cylindrical tank.
Further, when the apparatus is downsized, since the raw water intake, the dispersion umbrella, the drainage trough, and the like are formed in a cylindrical shape or a conical shape corresponding to the filtration tank, there are restrictions on downsizing.
In particular, when the drainage trough is cylindrical, there is a problem that a main body narrower than the diameter of the conventional type cannot be manufactured. In addition, there is a problem that the air lift pipe cannot be easily removed with a narrow trough that does not contain a tool.

Furthermore, in the conventional moving bed type sand filtration apparatus, even if the size can be reduced, the dead space cannot be eliminated.
The present invention was made in order to solve such a conventional problem, and its purpose is to move the sand filter which can be downsized by changing the filtration tank from a cylindrical shape to a rectangular cross section. To provide an apparatus.

  Another object of the present invention is to provide a method for inserting and removing an air lift pipe in a moving bed type sand filtration apparatus that can be miniaturized.

The invention which concerns on Claim 1 is equipped with the cylindrical part with a rectangular cross section, and the reverse gable-shaped lower member which has an opening part in the lower part connected to the said cylindrical part, The filtration tank which accommodates the filtration sand which forms a filter bed And a raw water introduction pipe that is attached to the cylindrical portion of the filtration tank and supplies raw water into the filtration tank, and is supported in the lower member of the filtration tank, and both ends thereof are opposed to the short side direction of the lower member. A gable-shaped diffusion umbrella that is in contact with an inner wall surface, and a suction pipe that is detachably disposed in a guide pipe that passes through the diffusion umbrella and is fixed to the diffusion umbrella, and is located at the lower end of the filter bed at the lower end. An air lift pipe having a mouth and having an air chamber above the suction opening; an air supply pipe disposed in the guide pipe and communicating between the air chamber and a compressed air supply source; and an outer portion of the guide pipe Is discharged from the air lift pipe A drainage trough attached to an upper opening of the filtration tank; a drainage trough attached to an upper opening of the filtration tank; and a drainage trough attached to a discharge pipe side of the airlift pipe and a discharge part of the airlift pipe A washing drain discharge pipe attached to discharge the washing drain; a treated water overflow weir provided on the upper opening side of the filtration tank; and a filtrate outlet pipe connected to the weir ; Two inclined plates having a shape, and two triangular side plates mounted in both ends of the two inclined plates, and two auxiliary inclined plates having a triangular shape are provided on both ends of the two inclined plates. Attached, the gap formed between the inner wall surface and the two inclined plates facing each other of the filtration tank is blocked, and the filtration sand forming the filter bed is configured not to flow down from the gap. And

The invention according to claim 2 is a filtration tank that includes a cylindrical portion having a rectangular cross section and a reverse gable-shaped lower member that is connected to the cylindrical portion and has an opening in the lower portion, and that stores filtration sand that forms a filter bed. And a raw water introduction pipe that is attached to the cylindrical portion of the filtration tank and supplies raw water into the filtration tank, and is supported in the lower member of the filtration tank, and both ends thereof are opposed to the short side direction of the lower member. A gable-shaped diffusion umbrella fixed to the inner wall surface, and a guide pipe that is inserted into and supported by a short pipe penetrating the diffusion umbrella and having a cover covering the head at the head of the short pipe An air lift pipe having a suction port located at the lower end of the filter bed at the lower end and provided with an air chamber above the suction port, and an air chamber and compressed air disposed in the guide pipe. An air supply pipe communicating with the supply source of the A cleaning pipe that disperses the filtered sand discharged from the air lift pipe, a storage section that arranges a discharge port side of the air lift pipe, and a drainage section for cleaning drainage. A drainage trough attached to the upper opening, a cleaning drainage pipe attached to the drainage to discharge the washing wastewater, a treated water overflow weir provided on the upper opening side of the filtration tank, and the weir A diffusion water pipe, and the diffusion umbrella includes two inclined plates each having a gable shape, and the short pipe at a joint portion between the two inclined plates, and both ends of the two inclined plates are connected to the filtration tank. The filter sand forming the filter bed is fixed to the inner wall surfaces facing each other with no gap, and is configured to flow down along the inclination of the two inclined plates .

The invention according to claim 3 is the moving bed type sand filtration apparatus according to claim 1 or 2, wherein the raw water introduction pipe is parallel to the two inclined plates of the diffusion umbrella at the upper part of the diffusion umbrella. The raw water inlet portion located in the cylindrical portion, a curved portion rising from the tip of the raw water inlet portion toward the upper opening of the filtration tank, and a raw water sprinkling umbrella provided on the opening side of the curved portion. It is characterized by.

The invention according to claim 4 is the moving bed type sand filtration device according to claim 1, further comprising a mech plate attached to the rectangular opening provided in the cylindrical portion of the filtration tank by flange joining, The raw water inlet pipe is attached to the mekra plate so that the raw water introduction pipe is detachable from the tubular portion of the filtration tank .

  The invention according to claim 5 is the moving bed type sand filtration device according to claim 1 or 2, wherein the air lift pipe is fixed to a cap that is detachably locked to an upper end portion of the guide pipe, An air supply pipe passes through the cap and communicates with a supply source of the compressed air, and the cap has a ventilation pipe that leads to the outside of the filtration tank and an air lift pipe that is disposed opposite to the air lift pipe. These two bolts are attached.

The invention according to claim 6 is the method for inserting and removing the air lift pipe in the moving bed type sand filtration apparatus according to claim 5, wherein the heads of the two bolts for lifting the air lift pipe are gripped from below, and the caps are attached together. The air lift pipe is inserted and removed by pulling upward .
According to a seventh aspect of the present invention, in the method for inserting and removing the air lift pipe according to the sixth aspect, when the filter sand is clogged between the guide pipe and the air chamber, the heads of the two bolts for lifting the air lift pipe A part is hold | gripped from the bottom , The said lift is spun off by rotating the said air lift pipe | tube by rotating centering on the said air lift pipe | tube with the said cap .

  The invention according to claim 8 is the method for inserting and removing the air lift pipe in the moving bed type sand filtration apparatus according to claim 5, wherein the air lift pipe is placed between the heads of the two bolts for lifting the air lift pipe and the cap. An air lift detachable metal fitting is prepared by attaching an operation member to the plate member, and the plate member of the airlift detachable metal fitting is arranged on the cap, and then the operation member is rotated so as to lift the air lift pipe. A plate member is placed between the head of the bolt and the cap, and the air lift pipe is inserted and removed by pulling the operating member upward.

  According to this invention, size reduction of a moving bed type sand filtration apparatus can be achieved by changing the filtration tank which makes a standard cylindrical shape into the filtration tank which makes a cross-sectional rectangular shape. Moreover, smooth sand movement can be ensured by changing the arrangement and connection method of the raw water inflow pipe. In addition, a stable cleaning mechanism can be secured by adding a gap closing member to the diffusion umbrella. In addition, the air lift pipe can be attached to and detached from the guide pipe and can be easily inserted into and removed from the drainage trough that has been reduced.

Hereinafter, the present invention will be described based on embodiments shown in the drawings.
1 to 13 show a moving bed type sand filtration apparatus according to an embodiment of the present invention (corresponding to claims 1, 3, 4 and 5).
The moving bed type sand filtration apparatus 1 according to the present embodiment includes a cylindrical portion 11 having a rectangular cross section and a reverse gable-shaped lower member 12 connected to the cylindrical portion 11 and having an opening 12e at the lower portion. It has a metal filtration tank 10 that houses the filtration sand S that forms F. The cylindrical portion 11 is provided with a cleaning water discharge pipe 13, a filtered water outlet pipe 14, an opening 11 a for attaching the raw water introduction pipe 15, and a treated water overflow weir 16. The opening 12e is provided with a drain 19 for draining water and removing sand. The lower member 12 is provided with support legs 17a and 17b for supporting a gable-shaped diffuser umbrella 20 described later on opposed slopes 12a and 12b. L-shaped receiving portions 17c and 17d are formed at the front ends of the support legs 17a and 17b in order to receive the end portions of the diffusion umbrella 20 respectively. Similarly, support legs 18a and 18b for supporting the gable-shaped diffuser umbrella 20 are provided on the opposing long side wall surfaces 12c and 12d of the lower member 12 so as to face each other. L-shaped receiving portions 18c and 18d are formed at the front ends of the support legs 18a and 18b in order to receive the ends of the gable-shaped diffusion umbrella 20 respectively.

  As shown in FIGS. 2 to 6, the gable-shaped diffusion umbrella 20 includes two inclined plates 21 a and 21 b having a gable shape, and two triangular side plates attached to both ends of the two inclined plates 21 a and 21 b. 22a and 22b are fixed by welding. In the gable-shaped diffusion umbrella 20, two auxiliary inclined plates 23a and 23b having a triangular shape are attached on both end portions of the two inclined plates 21a and 21b, and as shown in FIG. The gap formed between the wall surfaces 12c, 12d and the two inclined plates 21a, 21b is closed, and the filtration sand forming the filter bed is configured not to flow down from the gap. The two auxiliary inclined plates 23a and 23b having a triangular shape are provided with a stopper 23c that prevents the gable-shaped diffuser umbrella 20 from moving in the center direction along the inclined plates 21a and 21b of the gable-shaped diffuser umbrella 20. It is fixed by welding. Further, as shown in FIG. 5, a connection member 23e is attached to one lower end of each of the two auxiliary inclined plates 23a, 23b having a triangular shape via a hinge 23d. The connecting member 23e is provided with a hole 23f that is engaged with a protrusion 23g attached to the other lower end. The connecting member 23e is passed from the lower side of the supporting legs 18a, 18b provided on the opposing long side wall surfaces 12c, 12d of the lower member 12, and is stretched by engaging the holes 23f with the projections 23g. A through hole 24 is provided in the central portion of the gable-shaped diffusion umbrella 20 for inserting a guide pipe 26 of an air lift pipe 25 described later and fixing the guide pipe 26 by welding.

  As shown in FIGS. 2 to 8, the air lift pipe 25 is detachably arranged together with the air supply pipe 31 in the guide pipe 26 fixed to the gable-shaped diffusion umbrella 20, and the lower part of the filter bed F at the lower end. And the air chamber 27 is provided above the suction port 25a. The air lift pipe 25 is fixed to a cap 28 that is detachably locked to the upper end portion of the guide pipe 26. The air supply pipe 31 is disposed along the air lift pipe 25 through the cap 28 and communicates with the air chamber 27 and a compressed air supply source. The cap 28 is attached with a ventilation pipe 29 that leads to the outside of the filtration tank 10 and two bolts 30 for lifting the air lift pipe that are opposed to each other with the air lift pipe 25 interposed therebetween.

  As shown in FIGS. 2 and 8, the air lift pipe 25 is disposed in the accommodating portion 33 of the drainage trough 32 on the discharge port 25 b side. The drainage trough 32 has a storage portion 33 and a drainage portion 34 for cleaning wastewater, and is attached to the upper opening 10 a of the filtration tank 10 via an L-shaped metal piece 35. The cleaning water drain 34 is provided with a water level adjuster 34a according to a conventional method. A cleaning water discharge pipe 13 is attached to the drainage section 34 for cleaning drainage.

In the accommodating portion 33 of the drainage trough 32, a drainage washing pipe 36 for dispersing the filtered sand S discharged from the discharge port 25b of the airlift pipe 25 is disposed so as to surround the periphery of the guide pipe 26 of the airlift pipe 25.
As shown in FIGS. 1, 2, 9, and 10, the raw water introduction pipe 15 is a rectangular provided in the cylinder portion 11 so that the raw water can be introduced into the filtration tank 10 at the top of the gable-shaped diffusion umbrella 20. It is attached to the opening 11a having a shape. The raw water introduction pipe 15 has raw water inlet portions 15a and 15a positioned in the cylindrical portion 11 in parallel with the two inclined plates 21a and 21b at the upper part of the gable-shaped diffusion umbrella 20, and the tips of the raw water inlet portions 15a and 15a. Is composed of curved portions 15b, 15b rising toward the upper opening 10a of the filtration tank 10 and raw water sprinkler umbrellas 15c, 15c provided on the opening side of the curved portions 15b, 15b. The raw water inlet portions 15a and 15a are attached to the mekura plate 15d attached to the opening 11a having a shape, and the raw water inlet header pipe 15e is attached to the raw water inlet portions 15a and 15a. And attachment to the opening part 11a is made into flange joining on the condition that the protrusion which obstructs the water leak prevention at the driving | running water level and the movement of the filtration sand S cannot be made into the filtration tank side.

Next, the operation of the present embodiment configured as described above will be described.
First, as shown in FIG. 11, the filtration sand S forming the filter bed F is accommodated in the filtration tank 10.
Next, the air supply pipe 31 and the compressed air supply source are communicated to introduce raw water from the raw water introduction pipe 15.
The raw water is lifted up the filter bed F, SS and the like are removed, becomes clarified filtrate, overflows the treated water overflow weir 16 and is led out as filtrate through the filtrate drain pipe 14.

  The compressed sand supplied to the air chamber 27 of the air lift pipe 25 sucks the filtered sand S that has been filtered and trapped pollutants from the opening at the lower end of the air lift pipe 25, and the inside of the air lift pipe 25 is filtered with the sand S and water. The air rises at different speeds, the filtered sand S is trapped, and the SS and the like are separated. The separated SS and the filtered sand S and the washing water are discharged from the pipe end of the air lift pipe 25 to the accommodating portion 33 of the drainage trough 32. The SS or the like separated from the washing water stops at the drainage trough 32 by the action of some of the filtered water rising in the drainage washing pipe 36, and only the filtered sand S is returned to the filter bed F through the drainage washing pipe 36. In the drainage trough 32, SS and the like that have been peeled off are discharged through the cleaning water discharge pipe 13 from the drainage section 34 of the cleaning drainage at a water level adjusted according to a regular method.

As described above, in the moving bed type sand filtration device 1 according to the present embodiment, the dirty filter sand S can be simultaneously washed while sand filtering, as in the conventional moving bed type sand filtration device.
And according to the moving bed type sand filtration apparatus 1 which concerns on this embodiment, since the two auxiliary inclined plates 23a and 23b which make triangle shape are attached to the both sides of the gable-shaped spreading | diffusion umbrella 20, the opposing of the filtration tank 10 is carried out. The gap formed between the inner wall surfaces 12c, 12d and the two side plates 22a, 22b is closed by the two auxiliary inclined plates 23a, 23b having a triangular shape, and the filter sand S forming the filter bed F is formed. It does not flow down from the gap. Therefore, as shown in FIG. 11, the filtration sand S moves to the bottom side along the two inclined surfaces 12 a and 12 b of the lower member 11 of the filtration tank 10, and compresses the filtration sand S around the suction port of the air lift pipe 25. There is nothing to do. On the other hand, as shown in FIG. 12, when a gap is formed between the opposing inner wall surfaces 12c, 12d of the filtration tank 10 and the two side plates 22a, 22b, the filtration sand S is short-circuited and moved from the gap. In addition, the filter sand S around the suction port of the air lift pipe 25 is pressed, and the filter sand S cannot be continuously sucked up.

  Moreover, according to the moving bed type sand filtration apparatus 1 according to the present embodiment, since it is placed on the guide pipe 26 via the cap 28, a few between the guide pipe 26 and the air chamber 27 during operation. When the filter sand S of about a grain size is bitten, the operator lifts the air intake pipe 31 and the vent pipe 9 by hand and rotates in either direction, whereby the air lift pipe 25 is rotated and bitten. About 3 filter sands S can be shaken off (corresponding to claim 7).

Similarly, the air lift pipe 25 allows the operator to hold the air intake pipe 31 and the vent pipe 29 with hands and pull them straight up (corresponding to claim 6).
Moreover, according to the moving bed type sand filtration apparatus 1 according to the present embodiment, as shown in FIGS. 13 to 16, it is placed between the heads of the two bolts 30, 30 for lifting the air lift pipe and the cap 28. An air lift removing bracket 40 is prepared by attaching an operation member 42 to the plate member 41 to be placed. After the plate member 41 of the air lift removing bracket 40 is disposed on the cap 28, the operation member 42 is rotated to lift the air lift pipe. The air lift pipe 25 can be extracted by placing the plate member 41 between the heads of the two bolts 30 and 30 and the cap 28 and pulling the operating member 42 upward (corresponding to claim 8). .)

  Here, the plate member 41 is provided with two concave portions 41a on both side portions, into which the shaft portions of the two bolts 30 and 30 for lifting the air lift pipe can be fitted. In addition, the operation member 42 assembles a metal pipe member into an H shape so that the cap 28 located on the upper side of the air lift pipe 25 located in the housing portion 33 of the drainage trough 32 can be rotated, and on the upper side. It is comprised by attaching the pipe member for handles.

  Moreover, in the moving bed type sand filtration apparatus 1 according to the present embodiment, when the raw water inflow pipe 15 is raised, the movement of the filtration sand S is greatly hindered, and thus a horizontal penetration structure having the least hindrance is employed. Further, when the raw water inflow pipe 15 is directly welded to the filtration tank 10, the gable-shaped diffusion umbrella 20 positioned below cannot be attached or detached. In order to solve the problem, the raw water inflow pipe 15 is detachable from the outside.

  As described above, according to the moving bed type sand filtration apparatus 1 according to the present embodiment, the gable-shaped diffusion umbrella 20 is integrated with the air lift pipe 25 via the guide pipe 26, and the lower member 11 of the filtration tank 10 has 4. Since the two support members 17a, 17b, 18a, and 18b are provided, the air lift pipe 25 can be held vertically. In addition, maintenance can be performed without removing the filtration sand S and water when the air lift pipe 25 and the air supply pipe 31 are abnormal. Two auxiliary inclined plates 23a and 23b having a triangular shape are attached to both sides of the gable-shaped diffusion umbrella 20, and a gap formed between the inner wall surfaces 12c and 12d facing each other and the two side plates 22a and 22b of the filtration tank 10. Therefore, the smooth movement of the filtration sand S can be maintained.

  In addition, in the said embodiment, although the case where the air lift pipe | tube 25 was integrated with the gable-shaped spreading | diffusion umbrella 20 via the guide pipe 26 was demonstrated, as shown in FIGS. 17-19, this invention is not limited to this. The gable-shaped diffusion umbrella 20 may be fixed in the filtration tank 10 and the air lift pipe 25 may be freely inserted into and extracted from the gable-shaped diffusion umbrella 20 (corresponding to claim 2). In this case, the short pipe 50 for inserting the guide pipe is fixed in advance to the gable-shaped diffusion umbrella 20, the flange 51 is welded to a predetermined height of the guide pipe 26, and the flange 51 is placed on the short pipe 50. The guide pipe 26 is supported by the above. A short tubular cover 52 is also provided under the ridge 51 so as to sufficiently cover the head of the short pipe 50 so that the filtered sand S does not bite or fall into the gap between the ridge 51 and the short pipe 50. .

Thereby, since the edge of the guide pipe 26 and the gable-shaped diffusion umbrella 20 is cut, the gable-shaped diffusion umbrella 20 can be directly welded to the filtration tank 10. Therefore, retrofitting of the gap closing member becomes unnecessary.
Also in this case, the same effect as the above embodiment can be obtained.

It is a perspective view which shows the moving bed type sand filtration apparatus which concerns on one Embodiment of this invention. It is sectional drawing of the moving bed type sand filtration apparatus of FIG. It is a perspective view which shows the installation state of the gable-shaped spreading | diffusion umbrella in FIG. It is a perspective view which shows the installation state of the gable-shaped spreading | diffusion umbrella in FIG. It is explanatory drawing which shows the state which attached the auxiliary | assistant inclination board which makes triangle shape to the gable-shaped spreading | diffusion umbrella in FIG. It is a top view which shows the installation state of the gable-shaped spreading | diffusion umbrella in FIG. It is a perspective view which shows the relationship between the air lift pipe | tube and guide pipe in FIG. It is a perspective view which shows the relationship between the drainage trough in FIG. 1, an air lift pipe, and a washing | cleaning drainage pipe. It is sectional drawing which shows attachment of the raw | natural water inflow tube in FIG. It is a front view which shows attachment of the raw | natural water inflow pipe | tube in FIG. It is explanatory drawing seen from the front which shows the movement condition of the filtration sand in the gable-shaped spreading | diffusion umbrella vicinity in FIG. It is explanatory drawing seen from the side surface which shows the movement condition of the filtration sand in the vicinity of a gable-shaped spreading | diffusion umbrella in case there is no auxiliary | assistant inclination board in FIG. It is a front view which shows the tool which extracts the air lift pipe | tube in FIG. It is sectional drawing of the tool of FIG. It is explanatory drawing which shows the process of extracting the air lift pipe using the tool of FIG. It is explanatory drawing which shows the process of extracting the air lift pipe using the tool of FIG. It is a perspective view which shows the principal part of the moving bed type sand filtration apparatus which concerns on another embodiment of this invention. It is sectional drawing of FIG. It is a top view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Moving bed type sand filtration apparatus 10 Filtration tank 11 Cylindrical part 12 Reverse gable-shaped lower member 13 Washing water discharge pipe 14 Filtration water outlet pipe 15 Raw water introduction pipe 16 Treated water overflow weirs 17a, 17b, 18a, 18b Support leg 20 Gable-shaped diffusion umbrellas 21a, 21b Inclined plates 22a, 22b Side plates 23a, 23b Triangular auxiliary inclined plate 25 Air lift pipe 26 Guide pipe 27 Air chamber 28 Cap 29 Vent pipe 30 Bolt 31 Air supply pipe 32 Drain trough 33 Housing 34 Drainage section 36 Drainage cleaning pipe 40 Air lift removal fitting 41 Plate member 42 Operation member 50 Short pipe 51 鍔 52 Cover

Claims (8)

A filtration tank containing filtration sand forming a filter bed, comprising a cylindrical section having a rectangular cross section and a reverse gable-shaped lower member connected to the cylinder section and having an opening in the lower part,
A raw water introduction pipe that is attached to a cylindrical portion of the filtration tank and supplies raw water into the filtration tank;
A gable-shaped diffusion umbrella that is supported in the lower member of the filtration tank and whose both end portions are in contact with the inner wall surface facing the short side direction of the lower member,
It has a suction port located in the lower layer part of the filter bed at the lower end, and an air chamber above the suction port. The suction pipe is detachably arranged in a guide pipe that passes through the diffusion umbrella and is fixed to the diffusion umbrella. Air lift pipe,
An air supply pipe arranged in the guide pipe and communicating between the air chamber and a source of compressed air;
A cleaning pipe that disperses the filtered sand disposed on the outer side of the guide pipe and discharged from the air lift pipe;
A drainage trough that has an accommodating part for disposing the discharge port side of the air lift pipe and a drainage part for cleaning wastewater, and is attached to the upper opening of the filtration tank,
A cleaning drainage pipe that is attached to the drainage section and discharges the cleaning drainage;
Treated water overflow weir provided on the upper opening side of the filtration tank;
A filtered water outlet pipe communicating with the weir ,
The diffusion umbrella includes two inclined plates having a gable shape and two triangular side plates attached to both ends of the two inclined plates, and the two auxiliary inclined plates having a triangular shape are provided with the two inclined plates. Attached on both ends of the plate, the gap formed between the opposing inner wall surface of the filtration tank and the two inclined plates is closed, and the filtration sand forming the filter bed is prevented from flowing down from the gap. The moving bed type sand filtration device characterized by being made . A filtration tank containing filtration sand forming a filter bed, comprising a cylindrical section having a rectangular cross section and a reverse gable-shaped lower member connected to the cylinder section and having an opening in the lower part,
A raw water introduction pipe that is attached to a cylindrical portion of the filtration tank and supplies raw water into the filtration tank;
A gable-shaped diffusion umbrella that is supported in the lower member of the filtration tank and both ends are fixed to the inner wall surface facing the short side direction of the lower member,
The bottom of the filter bed is placed at the lower end of the short pipe that penetrates the diffusion umbrella and is removably disposed in a guide pipe on which a cover having a cover for covering the head is placed and supported. An air lift pipe having a suction port located in the section and having an air chamber above the suction port;
An air supply pipe arranged in the guide pipe and communicating between the air chamber and a source of compressed air;
A cleaning pipe that disperses the filtered sand disposed on the outer side of the guide pipe and discharged from the air lift pipe;
A drainage trough that has an accommodating part for disposing the discharge port side of the air lift pipe and a drainage part for cleaning wastewater, and is attached to the upper opening of the filtration tank,
A cleaning drainage pipe that is attached to the drainage section and discharges the cleaning drainage;
Treated water overflow weir provided on the upper opening side of the filtration tank;
A filtered water outlet pipe communicating with the weir ,
The diffusion umbrella includes two inclined plates each having a gable shape, and the short pipe at a joint portion between the two inclined plates, and the both end portions of the two inclined plates are spaced from each other on the opposing inner wall surfaces of the filtration tank. A moving bed type sand filtration device , wherein the filtration sand which is fixed and forms the filter bed flows down along the inclination of the two inclined plates . In the moving bed type sand filtration device according to claim 1 or 2,
The raw water introduction pipe includes a raw water inlet portion positioned in the cylindrical portion in parallel with two inclined plates of the diffusion umbrella at an upper portion of the diffusion umbrella, and an upper opening portion of the filtration tank from a tip of the raw water inlet portion. A moving bed type sand filtration device, comprising: a curved portion that rises toward the surface, and a raw water sprinkling umbrella provided on the opening side of the curved portion. In the moving bed type sand filtration device according to the preceding claim 1,
A rectangular opening provided in the cylindrical portion of the filtration tank has a mekura plate attached by flange joining, and the raw water inlet pipe is attached to the raw water inlet pipe by attaching the raw water inlet portion to the mekra plate. A moving bed type sand filtration device which is provided so as to be detachable from a cylindrical portion of a tank . In the moving bed type sand filtration device according to claim 1 or 2,
The air lift pipe is fixed to a cap that is detachably locked to the upper end of the guide pipe,
The air supply pipe communicates with the source of compressed air through the cap;
The moving bed type sand filtration device, wherein the cap is provided with a vent pipe leading to the outside of the filtration tank and two bolts for lifting the air lift pipe disposed opposite to each other across the air lift pipe. . In the moving bed type sand filtration device according to claim 5,
A method for inserting and removing the air lift pipe, wherein the head of the two bolts for lifting the air lift pipe is grasped from below and pulled up together with the cap . The method for inserting and removing the air lift pipe according to claim 6.
When the filter sand is clogged between the guide pipe and the air chamber,
The head of the two bolts for lifting the air lift pipe is gripped from below, and the cap is rotated about the air lift pipe together with the cap to rotate the air lift pipe and shake off the filtered sand. How to insert and remove the air lift pipe. In the moving bed type sand filtration device according to claim 5,
Prepare an airlift detachment fitting comprising an operation member attached to a plate member placed between the heads of the two bolts for lifting the airlift pipe and the cap,
The plate member of the air lift removal fitting, after which arranged on the cap, to rotate the operation member by mounting the plate member between the two bolt head and the cap of for the air lift pipe pulling The method of inserting / removing the air lift pipe, wherein the air lift pipe is inserted / removed by pulling the operating member upward.

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