JPH0759285B2 - Filtration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a filtration device having a tubular filter.

[Prior Art and its Problems] As the filter device is used, filter residue adheres to the filter and causes clogging, resulting in deterioration of the filter performance. Therefore, it is necessary to regularly clean the filter.

Cleaning of the filter is performed by disassembling the filtering device, taking out the filter to the outside, and scraping off and cleaning the filter residue attached to the filter, which is a laborious and time-consuming task.

Therefore, it is not easy to clean the filter frequently, and the period until the next cleaning tends to be long.

Therefore, the filter is considerably clogged near the cleaning time, and stable filtration performance cannot be obtained.

An object of the present invention is to provide a filter device that does not require time and labor for cleaning the filter, can be easily cleaned, is less likely to cause clogging, and can exhibit stable filtration performance.

[Means for Solving the Problems] In order to achieve the above object, the present invention stores a cylindrical filter in a casing in which an inlet, an outlet, and a wash water inlet are formed. , A screw blade whose central axis projects toward the upper end is rotatably supported so as to be close to the inner surface of the filter, and a rotary blade and a perforated disk are attached to the upper end of the central axis of the screw blade, The gist of the invention is that the perforated circular plate is provided on the outer peripheral side thereof.

[Operation] According to the present invention, the liquid to be filtered (hereinafter referred to as "stock solution")
Flows in through the inlet and is filtered by a filter,
The filtrate flows out through the outlet.

At this time, the flow of the undiluted solution that has flowed into the filter impinges on the rotary blades and advances through the gaps between the blades, and the flow is accelerated through the holes of the apertured portions of the perforated disk to rotate the screw blades.

The rotation of the screw blade scrapes off the filter residue attached to the inner surface of the filter, and the scraped filter residue is carried to the bottom of the filter and accumulated.

After a certain period of time, wash water is poured from the wash water inlet to generate a water flow in the direction opposite to the flow of the stock solution during normal filtration.

Then, the water flow advances into the filter from the bottom side of the filter and flows backward along the screw blades to rotate the screw blades.

In this case, the rotation direction of the screw blades is opposite to the rotation direction during filtration.

At this time, the filter cake that had already been scraped off and accumulated near the bottom of the filter is carried to the upper side of the filter by the water flow, and the filter cake on the inner surface of the filter is also scraped off by the screw blades and the upper part of the filter. Be carried to the side.

Then, the filter cake is carried by the water flow from the filter to the inflow port at the time of filtration and discharged to the outside of the filtration device.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical cross-sectional side view of a filtration device of the present invention, in which a cylindrical filter 2 is housed in a casing 1.

The casing 1 is provided with a stock solution inlet 3 for filtration on the front side and a filtrate outlet 4 on the back side, a washing water inlet 5 on the lower side of the back side, and an inlet / outlet 6 of the filter 2 on the upper side.
Are formed.

The doorway 6 is made of a transparent material, for example, a glass plate 7
It is preferable that the inside is checked because the inside can be confirmed.

Although the filter 2 is selected according to the object to be filtered,
In the case of this embodiment, the punching plate 8 on the outer side and the mesh wire net 9 on the inner side were used to filter the stock solution.

A flange 10 is formed on the upper end of the filter 2, and the flange 10 is formed.
The filter 2 is supported in the casing 1 by engaging with the locking portion 11 in the casing 1.

On the other hand, at the bottom end of the filter 2, a bearing recess 25 is formed at the center of the upper surface.
A bottom plate 25 having a formed therein is attached.

Inside the filter 2, a screw blade 12 having a size substantially equal to the inner diameter of the filter 2 is housed close to the inner surface of the filter 2.

The screw blades 12 are made of a material having low frictional resistance, for example, ultra-high molecular weight polyethylene.

The central shaft 13 of the screw blade 12 projects toward the upper end side, and a perforated disk 15 is attached between the two rotary blades 14 in this embodiment at the projected upper end portion.

As shown in a plan view of FIG. 2 and a partially omitted side view of FIG. 3, the rotary blade 14 has a right upward blade 14b mounted around a central hole 14a.

As shown in the plan view of FIG. 4 and the vertical sectional side view of FIG. 5, the perforated disc 15 is located near the outer periphery, which is a position corresponding to the portion of the blade 14b when superposed on the rotary blade 14, A plurality of holes 15a are provided around the center hole 15b as opening portions.

The upper end of the filter 2 has a plurality of introduction holes 16a on the upper side surface.
The cylindrical introduction body 16 having the above is attached, and the rotary vane 14 and the perforated disc 15 are housed inside the cylindrical introduction body 16.

A slender plate-shaped horizontal plate 17 is installed on the upper end of the cylindrical introduction body 16, and the central axis of the screw blade 12 is located at the center of the horizontal plate 17.
A shaft retainer 18 of 13 is attached by a bolt 19.

Further, a push plate 20 made of a plate body such as stainless steel having elasticity is attached to the upper surface of the horizontal plate 17, and the cylindrical introduction body 16 is pressed against the upper end of the filter 2.

The center axis 13 of the screw blade 12 is rotatably supported at its upper end by a shaft retainer 18 of a horizontal plate 17 and at its lower end by a bearing recess 25a of a bottom plate 25.

Next, regarding the usage and operation of the filtration device of the present invention,
This will be described with reference to FIG.

In the figure, the white arrow represents the flow during filtration (normal time), and the black arrow represents the water flow during washing of the filtration device (during reverse flow).

(1) During filtration During filtration, the inlet valve 21 and the outlet valve 22 are opened, and the wash water inlet valve 23 and the wash water outlet valve 24 are closed.

Then, the stock solution is fed into the filtering device from the inlet valve 21 side through the inflow port 3.

The stock solution fed into the filtering device flows into the filter 2 from the introduction hole 16a of the cylindrical introduction body 16 or the upper part of the cylindrical introduction body 16, is filtered by the filter 2, and the filtrate flows out from the outlet 4.

In this case, the flow of the undiluted solution in the filter 2 first hits the upper rotary blade 14, passes through the gap of the blade 14b, and the perforated disc 1
The screw blade 12 is rotated by passing through the hole 15a of 5 and hitting the lower rotary blade 14.

By the rotation of the screw blade 12, the tip of the screw blade 12 comes into contact with the inner surface of the filter 2 and scrapes off the attached filter cake.

The scraped off cake is carried to the bottom of the filter 2 by the blade of the screw blade 12 and accumulated.

(2) At the time of cleaning After a certain period of time, the filter 2 is cleaned. In this case, the inlet valve 21 and the outlet valve 22 are closed, and the cleaning water inlet valve 23 and the cleaning water outlet valve 24 are opened.

Then, the wash water is introduced from the wash water inlet 5 to generate a water flow in the direction opposite to the water flow at the time of normal filtration.

Then, the water flow advances into the filter 2 from the bottom side of the filter 2, first hits the lower rotary blade 14, passes through the gap of the blade 14b, passes through the hole 15a of the perforated disk 15, and passes through the upper rotary blade 14.
Rotate the screw blades 12 to reach the filter 2
Proceed from the upper part to the inlet 3 for filtration.

In this case, the rotation direction of the screw blade 12 is opposite to the rotation direction at the time of filtration.

At this time, the filter cake already scraped off and accumulated near the bottom of the filter 2 is carried to the upper side of the filter 2 by the water flow, and the filter residue on the inner surface of the filter 2 is also moved by the tip of the screw blade 12. It is scraped off and carried by the water stream to the upper side of the filter 2.

Then, these filter cakes are carried by the water flow from the filter 2 to the inflow port 3 at the time of filtration, and are discharged to the outside of the filtration device.

As shown in the above-mentioned embodiment, although illustration is omitted except that the perforated disk 15 is attached between the two rotor blades 14,
One rotor 14 and perforated disc 15 may be combined.

Further, the rotation speed of the screw blade 12 due to the flow of the undiluted solution and the rotation speed of the screw blade 12 due to the water flow of the washing water can be adjusted by the mounting angle of the blade 14b of the rotating blade 14.

When using two rotor blades 14, each rotor blade 14
The velocity of the flow can also be adjusted by changing the attachment angle of the blade 14b of the.

[Effects of the Invention] Since the present invention is as described above, the following effects can be obtained.

During use of the filtration device, that is, even during filtration, the filter residue is constantly scraped off by the screw blades, so clogging is less likely to occur and stable filtration performance can be exhibited.

In addition, the filter is cleaned by backwashing the wash water, and the backwash water also causes the screw blades to rotate in the opposite direction to that of the time of filtration, scraping off the filter cake attached to the filter. Then, the filter does not have to be taken out.

Therefore, the filter can be easily cleaned, which saves time and trouble.

[Brief description of drawings]

 Fig. 1: Vertical side view of the filtration device of the present invention Fig. 2: Plan view of a rotary blade Fig. 3: Side view with a part of the rotary blade omitted Fig. 4: Plan view of a perforated disc Fig. 5: Hole Fig. 6 is a vertical sectional side view of the open disk. Fig. 6 is an explanatory view of the operation of the filtration device of the present invention. 1 ... Casing, 2 ... Filter 3 ... … Screw blade 13 …… Center axis, 14 …… Rotary blade 15 …… Perforated disk

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B01D 35/16 7717-4D B01D 29/10 530 A 29/38 520 E 7717-4D 35/02 A

Claims (1)

[Claims] 1. A cylindrical filter is housed in a casing having an inflow port, an outflow port, and a wash water inflow port, and a screw blade having a central axis protruding from the upper end side is provided in the filter. Is rotatably supported so as to come close to the rotary blade, a rotary blade and a perforated disc are attached to the upper end of the central axis of the screw blade, and the perforated disc is provided with an opening near the outer periphery. A filtering device characterized by the above.