JPS5927606B2 - filtration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a filtration device, particularly a strainer.
The present invention relates to a filtration device having the following characteristics.

As a strainer for conventional filtration equipment.

Porous pipes for collecting water can be seen covered with a net.

However, such conventional strainers have a disadvantage in that the mesh body cannot be cleaned sufficiently.

Therefore, the object of the present invention is to provide a filtration device having a strainer that can thoroughly and automatically clean the mesh without using any special power.

The present invention will be explained below based on the drawings showing embodiments.

First, to explain the structure, reference numeral 1 in the figure is a filter tank with an open L portion.

In this filter tank 1, filter sand for filtering raw water is deposited to approximately the middle height to form a filter sand layer 2.

An L section water inflow pipe 4 with a check valve 3 is opened in the side wall of the filtration tank 1 at a position slightly higher than the surface of the filtration sand layer 2E.

In the illustrated example, the filtration device is installed in a fish pond, so the F section raw water inflow pipe 4 communicates with this fish pond.

Reference numeral 6 denotes a backwashing pipe, and the part of this backwashing pipe 6 is located at almost the same height as the location where the L-part metal water inflow pipe 4 is installed. Raw water inlet 5
The lower part below also serves as a lower raw water inflow pipe and is inserted into the filter sand layer 2.

An inlet is opened downward at a position near the bottom of the filtration tank 1.

An introduction chamber forming plate is attached to each introduction port.

Further, a cleaning air blowing pipe 7 is disposed in parallel with the backwashing pipe 6, and is branched into a plurality of openings near the bottom of the filtration tank 1.

On the other hand, a strainer is installed at an appropriate depth in the filter sand layer 2.
12 are arranged.

As shown in FIG. 2, the strainer 12 is composed of a perforated water collecting pipe 8 having a plurality of water collecting holes.

The water collection porous pipe 8 is covered with a net 10 formed in the shape of a tube bag using a nylon net cloth, for example, and the base of this tube bag-like net 10 is ligated with a suitable wire 11 or the like. ing.

Moreover, a filament 9 wound spirally around the porous water collection pipe 8 is interposed between the water collection porous pipe 8 and the net body 10 .

This filamentous body 9 comes into sliding contact with the inner surface of the mesh body 10 during cleaning.

and an outflow pipe 13 connected to the water collection porous pipe 8. Suction tube 18
It is also connected to a pump P that is used as a suction source.

The illustrated filtration device uses upper and lower raw water inflow pipes and a strainer 12 disposed between them to form a suction filtration type hill downstream (
(stereo) configured as a filter device.

Furthermore, a separation tank 15 is installed in the L-dynamics section within the filtration tank 1.

Next, the normal raw water filtration action will be described.

The pump 14 is operated to bring the strainer 12 into a suction state using negative pressure.

The raw water (pond water) that has flown in from the L-portion water inflow pipe 4 through the check valve 3 becomes a downward flow from the filter sand layer 2L surface due to the negative pressure suction action described in L, and is directed directly to the strainer 12. flows.

The other part passes through a check valve and flows from the raw water inlet 5 into the lower part of the backwash pipe 6, which also serves as the lower raw water inlet pipe, and flows from the inlet into the lower part of the filter sand layer 2, forming an L counterflow. and flows toward the strainer 12.

In this way, the raw water flowing as a laminar flow from the downhill direction through the filter sand layer 2 removes turbidity and becomes clear water, which is passed through the strainer 12 and the outflow pipe 13. It is discharged and returned to the outside (fish pond) through the suction pipe 18 and the like.

At this time, in the strainer 12 part.

Due to the negative pressure suction action, the net 10 comes into close contact with the water collecting porous pipe 8, and clear water is suctioned and collected through the net 10, preventing filter sand from flowing out, and preventing clogging of water collecting holes, etc. Prevented.

Next, the backwashing action of filter sand will be described.

When the filter sand layer 2 of the filter sand becomes clogged or clogged due to continuous operation of raw water filtration as shown in E, the filtration resistance, that is, the pump 1
A negative pressure head h) is applied to 4.

Therefore, by monitoring the negative pressure gauge, etc., the filtration operation is stopped and the cleaning operation is performed.

First, a suitable valve or the like is opened to blow in cleaning air from the air blowing pipe 7.

At the same time, a small amount of water is introduced into the lower part of the filter sand layer 2 from the backwash pipe 6 through the inlet to close the air tunnel hole.

By introducing this backwash water, the filter sand is agitated and the adhering suspended solids are dissociated by rubbing the filter sand against each other.

After carrying out this for about 1 to 2 minutes, the air blowing is stopped, and then a large amount of backwash water is introduced from the backwash pipe 6 for about 2 to 3 minutes to perform backwashing.

By this backwashing, the adhering suspended solids are almost completely dissociated and removed from the filter sand.

Note that during this backwashing, the L section metal water inflow pipe 4 and the raw water inlet 5 are turned into a closed state.

When cleaning such filter sand, the strainer 12
In this case, the agitation and disturbance of the filter sand and the accompanying net 1
The filter sand and the net body 10 are rubbed together by the vibration of 0,
Adherences such as turbidity on the outer surface of the net body 10 are dissociated and removed.

Further, as the net 10 moves, the net 10 and the spiral filament 9 are rubbed together, and the deposits on the inner surface of the net 10 are also dissociated and removed.

In this way, cleaning of the net body 10 proceeds simultaneously with cleaning of the filter sand, and the water permeation function is restored.

When the water level in the filter tank 1 rises due to the introduction of such backwash water and reaches the inlet of the separation tank 15, the heated waste water mixed with the filter sand flows into the separation tank 15, and the filter sand are separated and only hot water is drained outside.

Further, the filter sand separated once falls from the filter sand outlet at the bottom of the separation tank 15 due to its own weight and returns to the filter sand layer 2.

As explained above, according to the present invention, the water collecting porous pipe 8
, a mesh body 10 that covers the water collection porous pipe 8 and is shaken by the agitation of the filter sand during washing, and a mesh body 10 that is interposed between the water collection porous pipe 8 and the mesh body 10. Said net body 1
Since the strainer 12 composed of the filamentary bodies 9 that rub against the inner surface of the net 10 due to the movement of the net 10 is located in the filter sand layer 2, the net 10 prevents the filter sand from flowing out. Of course, when cleaning the filter sand, the filter sand and the net 10 itself are shaken, and this vibration causes the filament bodies 9 to act and clean the inner and outer surfaces of the net 10 without requiring any special power of their own. Because it will be done.

The effect is that an appropriate water permeation function can be maintained at all times, clogging is prevented, and water flow resistance during filtration is not increased.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a longitudinal cross-sectional view showing an embodiment of the filtration device according to the present invention, and Fig. 2 is an enlarged perspective view with a portion omitted showing the strainer portion of Fig. 1. be. Main symbols in the diagram: 8... Porous pipe for collecting water, 10.
... Reticular formation, 9 ... Striatum, 12 ...
...Strainer-12...Filter sand layer.

Claims (1)

[Claims] 1. A porous water collection pipe 8, a mesh body 10 that covers the water collection porous pipe 8 and is shaken by the agitation of the filter sand during cleaning, and a structure between the water collection porous pipe 8 and the mesh body 10. A strainer consisting of a filamentary body 9 interposed therebetween and which rubs against the inner surface of the net 10 as the net 10 oscillates.
12 or a filtration device located in the filter sand layer 2.