JPH0728882Y2 - Continuous sand filter - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a sand filter, and in particular, the raw water such as sewage and various industrial wastewater is passed through a sand filter layer to continuously filter the raw water. The present invention relates to a continuous sand filter device for purification.

[Conventional technology]

Domestic wastewater, industrial wastewater, and the like are purified by filtering them with a filter device so as to be reused as gray water or industrial water. A continuous sand filter device is known in which a filter layer is formed by filling a filter material made of sand for filtering into such a filter device, and raw water is supplied to the filter layer to continuously perform a filtering process. This will be described below with reference to FIG. 5 which is a schematic sectional configuration explanatory view.

Reference numeral (1) shown in the figure is a filtration tank, and this filtration tank (1) is composed of an upper cylindrical portion (1a) and a lower funnel-shaped cone portion (1b). Then, in the filtration tank (1), a filtration layer (2) is formed up to an intermediate portion of the cylindrical portion (1a) by filling with filtration sand as a filtration material, and the filtration layer (2) is formed. ), A plurality of raw water for filtration treatment, which are supplied from a raw water supply passage (4) provided around the inclined surface of the cone portion (1b) while being buried in the filter layer (2). The raw water supply nozzle (3) is arranged at a position off the radial center of the cone portion (1b).

The raw water supplied from the plurality of raw water supply nozzles (3) is evenly distributed over the entire area of the filtration layer (2) by a distributor (5) arranged above, and then inside the filtration layer (2). The contaminants contained in the raw water are captured and purified by the filter material of the filter layer (2) while rising. The filtered water thus purified is discharged from the water collecting trough (6) installed at the upper part of the filtering tank (1) through the outflow passage (7).

On the other hand, as described above, the filter medium is contaminated by filtering the raw water by the filter layer (2), and the contaminated filter medium is washed while being circulated in the filter tank (1) through the filter medium washing device. . Specifically, an air lift pipe (8) as a filter material cleaning device is vertically provided at the center of the filtration tank (1) in the radial direction, and air is sent into the air lift pipe (8) to filter the filter material. Is configured to rise within it. This air lift pipe (8)
Opens the suction port (8a) formed at the lower end toward the bottom of the cone part (1b), and the overflow outlet (8b) at the upper end is the cylinder part (1
It protrudes into the casing (9) provided in the upper part of (a) and faces the baffle pipe (14) provided inside the casing (9).

Therefore, the filter material is attached to the suction port (8
Contaminants that are sucked in from a) and rise in the air lift pipe (8) are separated from the adhering contaminants from the filter medium, and the overflow (8b) inside the baffle pipe (14). Gushes into.

Then, the cleaning wastewater containing contaminants is discharged through the drainage channel (10), while the filter medium descends through the cleaning section (11) provided with the labyrinth protrusion and comes into contact with the filtered water rising inside thereof. To be washed. The filter material, which has been cleaned by being filtered with filtered water, is spread over the filter layer (2) by being fixed to the sheath pipe (12) provided outside the air lift pipe (8). The umbrella (13) uniformly diffuses the whole area of the filtration tank (1) and returns it to the filtration layer (2). In addition, in this filtration tank (1), the shape of the lower part of the filtration tank (1) is taken into consideration so that all of the filtration material forming the filtration layer (2) can be circulated through the air lift pipe (8). The cone part (1b).

[Problems to be solved by the device]

The continuous sand filter having the above-mentioned configuration is useful as such, but in view of the cleaning ability of the filter medium and the continuous operation of the stable continuous sand filter, the problems as described below still remain. have.

That is, in the conventional filter media cleaning device of the continuous sand filter device, while the filter media is sucked up by supplying the compressed air to the air lift pipe, the filter media cleaning device which constitutes the outside of the lower part of the filter media cleaning device is used. Since it is dropped through the inside of the tubular portion, and clean filtered water filtered by the filter layer is flown upward from the lower side of the outer tubular portion to wash the filter medium,
If the amount of the filtering material that falls is too large, the normal inflow of filtered water is hindered, and there is a problem that the filtering material is not always sufficiently washed.

Further, since the labyrinth protrusions provided inside the casing of the filter medium cleaning device are fixed, the filter medium is clogged at this portion, and the filter medium does not drop into the filter layer portion, so that the filter medium is not dropped. There is also a problem that a great amount of labor is required to restore the smoothly dropped state.

Of course, if the gap between the labyrinth protrusion provided on the lower inner periphery of the casing and the labyrinth protrusion provided on the outer peripheral side of the sheath tube is widened, such clogging of the filter medium can be eliminated. It is possible. However, this is not preferable because the filter material is not always sufficiently washed.

Therefore, an object of the present invention is to provide a continuous sand filter capable of preventing the clogging of the filter medium while improving the cleaning ability of the filter medium by solving the above problems.

[Means for Solving the Problems]

In order to achieve the above object, the main means adopted by the continuous sand filter device according to the first aspect of the present invention is that a filtration tank (1) having a funnel-shaped cone portion (1b) is provided at the bottom thereof. A filter layer (2) is formed by filling the lower part of the filter tank (1) with a filter material made of filtering sand, and the position is offset from the radial center of the lower side of the cone part (1b). A raw water supply nozzle (3) that penetrates through the filter layer (2) and supplies the raw water for treatment into the filter layer (2) is installed so as to be buried in the filter layer (2), and the upper part of the filter tank (1) is provided. A casing (9) having a baffle pipe (14) whose upper portion projects from the filtration tank (1) is provided on the side, and a vertical sheath pipe in which the upper portion is inserted into the casing (9). (12) is placed in the center of the filtration tank (1), and An air lift pipe (8) having a suction port (8a) at the lower end extending to the bottom of the cone portion (1b) and having an overflow outlet (8b) at the upper end extending to the position of the baffle pipe (14) is loosely fitted. And the outer circumference of the insertion portion of the sheath tube (12) into the casing (9),
A continuous sand filter, comprising: a washing section (11) having labyrinth protrusions (17) and (16) provided on the inner periphery of a casing (9) facing the inserted portion of the sheath tube (12), A jet presser plate (15) is provided on the upper inside of the baffle pipe (14), and a buffer ring (18) contacting the inner circumference of the casing (9) is provided above the labyrinth protrusions (16) and (17). A ring actuating mechanism (30) for adjusting a gap (d) between the buffer ring (18) and the outer circumference of the sheath pipe (12) is provided.

Further, the main means adopted by the continuous sand filter according to the second invention of the present invention is that the cone-shaped (1
A filtration tank (1) having b) is provided, and a filtration layer (2) is formed by filling a lower part of the filtration tank (1) with a filtration material composed of filtration sand, and the cone portion (1b) is formed. ) A state in which a raw water supply nozzle (3) that penetrates from a position deviated from the radial center on the lower side and supplies the raw water for treatment into the filtration layer (2) is buried in the filtration layer (2). And a casing (9) in which a baffle pipe (14) whose upper portion projects from the filtration tank (1) is provided inside the filtration tank (1). ), A vertical sheath tube (12) having an upper part inserted therein is arranged in the center of the filtration tank (1), and the sheath tube (12)
The air lift pipe (8) having a suction port (8a) at the lower end extending to the bottom of the cone portion (1b) and an overflow outlet (8b) at the upper end extending to the position of the baffle pipe (14). The labyrinth is provided in a fitted state, and is provided on the outer circumference of the insertion portion of the sheath pipe (12) into the casing (9) and the inner circumference of the casing (9) facing the insertion portion of the sheath pipe (12). In a continuous sand filter provided with a cleaning section (11) having protrusions (17) and (16), a labyrinth protrusion (17) on the outer periphery of the upper portion of the sheath pipe (12) is attached to the sheath pipe (12). It is characterized by being supported so that it can be raised and lowered along it.

[Action]

According to the first aspect of the present invention, when raw water is supplied from the raw water supply nozzle (3) into the filter bed (2) as in the conventional device, contaminants contained in the raw water are filtered by the filter bed ( It is captured and separated by the filter material composed of the filtering sand of 2) and filtered. Then, the filter medium contaminated by capturing the contaminants is the suction port (8a) of the air lift pipe (8).
While being sucked from and rising in it, contaminants are separated, further washed in the washing section (11), and then returned to the filtration layer (2) again. By the way, the filter medium sucked from the suction port (8a) of the air lift pipe (8) and ejected upward from the overflow outlet (8b) flows into the casing (9) and moves onto the buffer ring (18). However, the moved filter medium is changed by the operation of the operating mechanism (30) according to the accumulation condition of the filter medium, and the inner tip of the buffer ring (18) and the sheath pipe (12).
Through the gap (d) between the outer periphery of the filter and the outer periphery of the filter and falls onto the filter layer (2).

According to the second aspect of the present invention, of the labyrinth protrusions (16) and (17), the labyrinth protrusion (17) on the sheath tube (12) side is supported so that it can be raised and lowered. By doing so, the distance between the labyrinth protrusion (17) and the labyrinth protrusion (16) inside the casing (9) is changed, and the optimum distance according to the accumulation condition of the filtering sand in the casing (9). Is set.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

First Embodiment Hereinafter, a continuous sand filter according to a first embodiment will be described with reference to FIG. 1 of a sectional configuration explanatory diagram, FIG. 2 of a sectional configuration explanatory diagram of a filter medium cleaning mechanism, and a buffer ring and a ring operation. With reference to FIG. 3 which is a structural explanatory view of the mechanism, members which are substantially the same as or equivalent to those of the conventional continuous sand filter apparatus shown in FIG. 5 will be described with the same reference numerals.

However, as is well understood from FIG. 1, the structure of the continuous sand filter according to this embodiment is substantially the same as the structure of the continuous sand filter according to the prior art. I will just explain.

That is, as shown in FIG. 1 and FIG. 2, of the cleaning unit (11) and the casing (9) that constitute the outside of the filter material cleaning mechanism in the filtration tank (1), the filtration tank (1)
A cylindrical baffle tube (14) is arranged at the radial center of the casing (9) provided in the upper part of the inside. Then, a jet pressing plate (15) was arranged on the upper part inside the baffle tube (14). The jet presser plate (15) serves to reduce the force of the filtering material blown upward from the overflow outlet (8b) on the upper end side of the air lift pipe (8), and the length of the baffle pipe (14). The effect is large in shortening.

Further, a labyrinth protrusion (17) provided on the outer periphery of the insertion portion of the sheath pipe (12) into the casing (9) and the lower side of the casing (9) facing the insertion portion of the sheath pipe (12). On the inner wall of the funnel-shaped portion of the casing (9) above the labyrinth protrusions (16) provided on the inner circumference of the portion,
A buffer ring (18) with which the outer peripheral portion contacts is arranged,
The buffer ring (18) was fitted with an end surface on the inner diameter side and
A ring actuating mechanism (30) for adjusting the gap (d) between the outer circumference and the outer periphery of (2) is attached.

The buffer ring (18) and the ring actuating mechanism (30) will be described in detail below. As shown in FIG. It consists of a combination of fan-shaped half-rings (18a) and (18b) with a central angle of 180 degrees that can be expanded and contracted in one direction, and the other end of one half-ring (18a) Attaches a gearbox (31) that has a worm and a worm wheel inside, and rotates the handle (36) that attaches the worm to the tip of this rod (32) through the rotating rod (32). The half rings (18a) and (18b) are expanded and contracted. Further, a fan-shaped shield plate is arranged on the upper surface of the other half ring (18b), and these half rings (18a) and (18b) are generated by expansion and contraction of these half rings (18a) and (18b). The gap on the mating end side of is closed. An air supply hose (8c) that supplies compressed air to the air lift pipe (8) is connected to the air lift pipe (8) from the upper side of the baffle pipe (14).

Hereinafter, the operation mode of the continuous sand filter having the filter medium cleaning mechanism having the above structure will be described. When the continuous sand filter is operated, raw water is supplied in the same manner as the continuous sand filter according to the conventional technique. If compressed air is supplied to the air lift pipe (8) while being supplied from the raw water supply nozzle (3), it is the lower part of the filtration tank (1), that is, the cone part (1b) and the suction of the air lift pipe (8). The filter medium interposed near the mouth (8a) is successively sucked from the suction port (8a) and ejected from the overflow outlet (8b) to the inside of the baffle pipe (14).

The filter medium thus ejected collides with the ejection retainer plate (15) provided on the upper part of the baffle pipe (14) to reduce its momentum, and the filter medium is successively provided on the buffer ring (18) side. The filter medium, while passing through the gap (d) and falling between the labyrinth protrusions (16) and (17), the filter medium continues to flow upward while falling. It is washed and returned to the lower filtration layer (2) inside the filtration tank (1). And as above,
The force of the filter medium that continues to eject from the overflow port (8b) of the air lift pipe (8) is decelerated by the ejection presser plate (15), and the amount of passage through the opening at the bottom of the baffle pipe (14) is reduced. Since it is limited, a predetermined amount will be supplied to the labyrinth mechanism part, the inflow of filtered water into the cleaning part (11) is not obstructed, and the filtered water continues to smoothly flow upward. The filter material is washed normally.

Moreover, by operating the handle (36) of the ring operating mechanism (30), the half rings (18a), (1) of the buffer ring (18) are
8b) can be expanded or contracted to change the gap (d) between the inside of the buffer ring (18) and the sheath pipe (12) so that the filter medium can be smoothly dropped, so This continuous sand filter can be operated in a stable state without causing clogging over a period of time. Of course, the contaminated water generated by washing the filter medium will be discharged from the drainage channel (10) as in the conventional continuous sand filter.

In addition, as described above, since the gap (d) can be freely changed, even if the setting of the gap (d) is not appropriate and the filter medium is clogged, the ring operating mechanism (30)
It is possible to easily clear the clogging of the filter media and restore the filter media to a state in which it can drop smoothly by simply operating the handle (36). Therefore, stop the operation of this continuous sand filter device. I no longer need to let you.

In the above, the example in which the buffer ring (18) is divided into two has been described, but an even division may be used, and for example, this may be divided into four.

Second Embodiment The second embodiment will be described below with reference to FIG. 4 which is an explanatory view of the configuration of the main part of the second embodiment, and only the differences in construction from the first embodiment will be described below.

That is, a screw rail (34) is provided on the outer circumference of the sheath tube (12), and a plurality of labyrinth protrusions (17) protruding outward are provided on the outer circumference of the screw cylinder (35) screwed to the screw rail (34). At the same time, a pair of vertical rods (33), (33) are fixed to the upper side of the labyrinth protrusion (17) of the screw cylinder (35), and the handle (3) is attached to the tops of these rods (33), (33).
The end of 6) is fixed and the screw cylinder (35) is rotated by rotating the handle (36).

Therefore, when the handle (36) is rotated, the rod (3
The screw cylinder (35) rotates and goes up and down via 3) and (33),
The vertical gap (d) between the labyrinth protrusion (17) and the labyrinth protrusion (16) provided inside the casing (9) is changed, so that the filter medium can be moved and the passing amount thereof can be adjusted. Therefore, the operation and effect of this second embodiment are substantially the same as those of the first embodiment.

It should be noted that any of the above-described embodiments are merely specific examples of the present invention, and therefore the scope of the technical idea of the present invention is not limited by this embodiment, and further, design changes within the scope not departing from this technical idea. And so on.

[Effect of device]

As described in detail above, according to the continuous sand filter of the first aspect of the present invention, the clearance between the inner tip of the buffer ring and the outer periphery of the sheath tube can be freely adjusted, and the second aspect of the present invention can be used. According to the continuous sand filter, since the labyrinth protrusion on the sheath tube side can be moved up and down, the labyrinth protrusion and the labyrinth protrusion inside the casing can be freely adjusted in the vertical direction to accumulate in the casing. Since the fall amount of the filter medium can be adjusted to the optimum fall amount, the smooth inflow of washing water into the casing is not hindered, and the filter medium can be stably washed.

Further, since the gap can be freely changed as described above, it becomes possible to easily prevent the filter material from being clogged, and it becomes possible to continuously operate the continuous sand filter device stably for a long period of time.

Further, since the continuous sand filter device can be stably operated for a long period of time, an economic effect that the running cost can be significantly reduced can be derived.

Therefore, according to the present invention, it is possible to realize an extremely excellent and effective continuous sand filter device capable of preventing the clogging of the filter medium while improving the cleaning ability of the filter medium.

[Brief description of drawings]

1 to 3 show the first embodiment of the present invention,
FIG. 1 is an explanatory view of a sectional structure of a continuous sand filter, FIG. 2 is an explanatory view of a sectional structure of a filter medium cleaning mechanism, FIG. 3 is an explanatory view of a ring operating mechanism, and FIG. 4 is a second embodiment of the present invention. FIG. 5 is a schematic cross-sectional configuration explanatory view of a continuous type sand filtering apparatus according to the related art. (D) ... gap, (1) ... filtration tank, (1a) ... cylinder part, (1b) ... cone part, (2) ... filtration layer, (3)
…… Raw water supply nozzle, (4) …… Raw water supply channel, (5)…
… Distributor, (6) …… Catchment gutter, (7) ……
Outflow path, (8) …… Air lift pipe, (8a) …… Suction port,
(8b) …… Overflow outlet, (9) …… Casing, (10) ……
Drainage channel, (11) …… washing section, (12) …… sheath pipe, (14)…
… Baffle tube, (15) …… Spout plate, (16), (17)
…… Labyrinth protrusion, (18) …… Buffer ring, (18
a), (18b) …… Half ring, (30) …… Ring operating mechanism, (31) …… Gear box, (32) …… Rotating rod, (33) …… Rod, (34) …… Screw Rails, (35)
…… Screw tube, (36) …… Handle.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication B01D 29/62 29/66 B01D 23/10 C 23/24 Z (56) References -25908 (JP, U) Showa 58-54177 (JP, Y2)

Claims (2)

[Scope of utility model registration request] 1. A filtration tank (1) having a funnel-shaped cone portion (1b) at a lower portion thereof, and the filtration tank (1) is filled with a filtering material made of filtering sand at a lower portion thereof for filtration. A layer (2) is formed, and a raw water supply nozzle (3) for supplying raw water for treatment into the filtration layer (2) by penetrating from a position displaced from the radial center of the lower side of the cone portion (1b). ) Is installed in a state of being buried in the filtration layer (2),
A casing (9) having a baffle pipe (14) protruding upward from the filtration tank (1) is provided on the upper side of the filtration tank (1), and the casing (9) has an upper portion. A vertical sheath tube (12) in which is inserted is arranged in the center of the filtration tank (1), and the sheath tube (12)
The air lift pipe (8) having a suction port (8a) at the lower end extending to the bottom of the cone portion (1b) and an overflow outlet (8b) at the upper end extending to the position of the baffle pipe (14). The labyrinth is provided in a fitted state, and is provided on the outer circumference of the insertion portion of the sheath pipe (12) into the casing (9) and the inner circumference of the casing (9) facing the insertion portion of the sheath pipe (12). In a continuous sand filter provided with a cleaning section (11) having projections (17) and (16), a jet presser plate (15) is disposed above the inside of the baffle pipe (14) to provide the labyrinth. A buffer ring (18) contacting the inner circumference of the casing (9) is provided above the projections (16) and (17), and a gap (d) between the buffer ring (18) and the outer circumference of the sheath tube (12). ) A continuous type sand filter, which is provided with a ring operating mechanism (30) for adjusting the interval. 2. A filtration tank (1) having a funnel-shaped cone portion (1b) provided at the bottom, and the filtration tank (1) is filtered by filling a filtration material made of sand for filtration on the bottom side. A layer (2) is formed, and a raw water supply nozzle (3) for supplying raw water for treatment into the filtration layer (2) by penetrating from a position displaced from the radial center of the lower side of the cone portion (1b). ) Is installed in a state of being buried in the filtration layer (2),
A casing (9) having a baffle pipe (14) protruding upward from the filtration tank (1) is provided on the upper side of the filtration tank (1), and the casing (9) has an upper portion. A vertical sheath tube (12) in which is inserted is arranged in the center of the filtration tank (1), and the sheath tube (12)
The air lift pipe (8) having a suction port (8a) at the lower end extending to the bottom of the cone portion (1b) and an overflow outlet (8b) at the upper end extending to the position of the baffle pipe (14). The labyrinth is provided in a fitted state, and is provided on the outer circumference of the insertion portion of the sheath pipe (12) into the casing (9) and the inner circumference of the casing (9) facing the insertion portion of the sheath pipe (12). In a continuous sand filter provided with a cleaning section (11) having protrusions (17) and (16), a labyrinth protrusion (17) on the outer periphery of the upper portion of the sheath pipe (12) is attached to the sheath pipe (12). A continuous sand filter, characterized by being supported so that it can be raised and lowered along it.