JPH01215319A - Filter device - Google Patents

Abstract

PURPOSE:To simplify the cleaning of filter by scraping off the filter cake on a cylindrical filter by a screw blade even during the operation to prevent clogging, and flowing the washing water backward and simultaneously revolving the screw blade when cleaning is carried out. CONSTITUTION:The cylindrical filter 2 is received in a casing 1 provided with an inlet port 3, an outlet port 4 and a cleaning water inlet port 5. A screw blade 12 the central shaft 13 of which is projected to the upper end side is supported with the shaft in the filter 2 so as to approach closely to the inner side surface of the filter and to be freely rotatable. Revolving blades 14 and a perforated disk 15 are fixed at the upper end of the central shaft 13 and the perforated part of the disk 15 is provided in the vicinity of outer periphery. Thus the screw blade scrapes the cake off even during filtration to prevent clogging, and a stable filtration performance is obtained. And, the cleaning of the filter is carried out by flowing the washing water backward, and this backward flow rotates the screw blade which scrapes the cake off with the result that the need of the disassembly of the filter device to take out the filter is eliminated.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a filtration device equipped with a cylindrical filter.

[Prior Art and Its Problems] As a filtration device is used, filter slag adheres to the filter, causing clogging and reducing filtration performance, so it is necessary to periodically clean the filter.

Cleaning of the filter is performed by disassembling the filtration device, taking the filter out, and scraping off filter slag adhering to the filter for cleaning, which is a laborious, time-consuming and troublesome task.

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

As a result, the filter becomes quite clogged near the cleaning time, making it difficult to obtain stable filtration performance.
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An object of the present invention is to provide a filtration device that can be easily cleaned without requiring much effort or time to clean the filter, and can exhibit stable filtration performance without clogging.

[Means for Solving the Problems] In order to achieve the above-mentioned problems, the present invention houses a cylindrical filter in a casing in which an inlet, an outlet, and a wash water inlet are formed. , a screw blade with a central shaft protruding from the upper end side is rotatably supported close to the inner surface of the filter, a rotating blade and a perforated disc are attached to the upper end of the central axis of the screw blade, The gist is that the aperture of the chain perforated disc is provided near the outer periphery.

[Function] According to the present invention, the liquid to be filtered (hereinafter referred to as "undiluted solution")
Flows in from the inlet, is filtered by the filter, and the filtrate flows out from the outlet.

At this time, the flow of the stock solution that has flowed into the filter hits the rotor blades and flows through the gaps between the blades, and the flow is accelerated through the holes in the perforated disc, thereby rotating the screw blades.

As the screw blades rotate, filter dregs adhering to the inner surface of the filter are scraped off, and the scraped off filter dregs are carried to the bottom of the filter and deposited thereon.

After a certain period of time has elapsed, wash water is poured in from the wash water inlet to generate a water flow in the opposite direction 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 back upward along the screw blades, causing the screw blades to rotate.

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

At this time, the filter slag that has 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 slag on the inner surface of the filter is also scraped off by the screw blades and is removed from the top of the filter. carried to the side.

Then, the filter slag is carried by the water flow from the filter to the inlet for filtration, and is discharged out of the filtration device.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

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

The casing 1 has an inlet 3 for the raw solution during filtration on the front side.
A filtrate outlet 4 is formed on the back side, a washing water flow port 5 is formed at the lower part of the back side, and an inlet/outlet 6 for the filter 2 is formed at the upper part.

The entrance/exit 6 is made of a transparent material, for example, a glass plate 7.
It is preferable to fit it in because you can check the inside.

Filter 2 is used depending on the object to be filtered.
In the case of this example, a punching plate 8 on the outside and a mesh wire gauze 9 on the inside were used to filter the stock solution.

A flange portion 10 is formed at the upper end of the filter 2, and the filter 2 is supported within the casing 1 by engaging the flange portion 10 with a locking portion 11 within the casing 1.

On the other hand, the bottom end of the filter 2 has a bearing recess 2 in the center of the top surface.
A bottom plate 25 on which 5a is formed is attached.

Inside the filter 2, a screw blade 12 of approximately the same size as the inside of the filter is housed close to the inner surface of the filter 2.

The screw blade 12 is made of a material with low frictional resistance,
For example, it is made of ultra high molecular weight polyethylene.

The center shaft 13 of the screw blade 12 protrudes toward the upper end,
In this embodiment, two rotary blades 14 are provided at the protruding upper end.
A perforated disk 15 is installed in between.

As shown in FIG. 2 as a plan view and as shown in FIG. 3 as a partially omitted side view, the rotor blade 14 has a right-sloping blade 1 around the center hole 14a.
4b is attached.

As shown in FIG. 4 as a plan view and as shown in FIG.
A plurality of holes 15a are provided as openings around the center hole 15b near the outer periphery at a position corresponding to the portion 4b.

At the upper end of the filter 2, there are a plurality of introduction holes 16 at the upper side surface.
A cylindrical introduction body 16 having a shape a is attached thereto, and a rotary blade 14 and a perforated disc 15 are housed inside the cylindrical introduction body 16.

An elongated horizontal plate 17 is installed at the upper end of the cylindrical introduction body 16, and a screw blade 12 is installed in the center of the horizontal plate 17.
A shaft holder 18 of the central shaft 13 is attached by a pin 19.

Further, a push plate 20 made of a resilient plate made of stainless steel or the like is attached to the upper surface of the horizontal plate 17, and presses the cylindrical introduction member 16 against the upper end of the filter 2.

The upper end of the central axis 13 of the screw blade 12 is connected to the horizontal frame plate 17.
The lower end of the bearing recess 25 in the bottom plate 25 is held by the shaft holder 18.
It is rotatably supported by a.

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

In addition, in the figure, the white arrow shows the water flow during filtration (normal time), and the black arrow shows the water flow when cleaning the filtration device (backflow time).

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

Then, the stock solution is sent from the inlet valve 21 side into the filtration device through the inlet 3.

The stock solution sent into the filtration device flows into the filter 2 through the introduction hole 16a of the cylindrical introduction body 16 and 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 stock solution in the filter 2 first hits the upper rotor blade 14, passes through the gap between the blades 14b, passes through the hole 15a of the perforated disk 15, hits the lower rotor blade 14, and passes through the screw blade 12. Rotate.

By the rotation of the screw blade 12, the screw blade 1
The tip of the filter 2 comes into contact with the inner surface of the filter 2 and scrapes off the filter dregs that have adhered thereto.

The scraped filter dregs are carried to the bottom of the filter 2 by the blades of the screw blades 12 and deposited thereon.

(2) During cleaning After a certain period of time has elapsed, 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, washing water is poured from the washing water flow port 5 to generate a water flow in the opposite direction to the water flow during normal filtration.

Then, the water flow advances into the filter 2 from the bottom side of the filter 2, first hits the lower rotor blade 14, passes through the gap between the blades 14b, passes through the hole 15a of the perforated disc 15, and hits the upper rotor blade 14. , rotate the screw blade 12,
The flow proceeds from the upper part of the filter 2 to the inlet 3 for filtration.

The direction of rotation of the screw blades 12 in this case is opposite to the direction of rotation during filtration.

At this time, the filter slag that has already been 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 slag on the inner surface of the filter 2 is also removed from the tip of the screw blade 12. The particles are scraped off by the filter and carried to the upper side of the filter 2 by the water flow.

These filter dregs are carried by water flow from the filter 2 to the inlet 3 during filtration, and are discharged to the outside of the filtration device.

As shown in the embodiment described above, in addition to installing the perforated disc 15 between the two rotary blades 14, although not shown in the drawings, one rotary blade 14 and the perforated disc 15 may be combined. You can.

Also, the attachment of the blades 14b of the rotary blade 14 depends on the angle.
It is also possible to adjust the rotational speed of the screw blades 12 due to the flow of the stock solution and the rotational speed of the screw blades 12 due to the flow of washing water.

Note that when two rotary blades 14 are used, the speed of the flow can also be adjusted by changing the attachment angle of the blades 14b of each rotary blade 14.

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

During use of the filtration device, that is, even during filtration, the screw blades are constantly scraping off the slag, so that stable filtration performance can be achieved without clogging.

In addition, the filter is cleaned by backflowing the washing water, and the backflow of the washing water also rotates the screw blades in the opposite direction to that during filtration, scraping off the filter slag that has adhered to the filter, so the filtration device can be disassembled. There is no need to take the filter out.

Therefore, the filter can be cleaned easily and does not require much effort or time.

[Brief explanation of the drawing]

Figure 1: Longitudinal side view of the filtration device of the present invention Figure 2: Plan view of the rotor blade Figure 3l: Partially omitted side view of the rotor blade Figure 4: Plan view of the perforated disc Figure 5: Perforated Longitudinal side view of the disk No. 67 Second explanatory diagram of the operation of the filtration device of the present invention 1...Casing 2...Filter 3...Inlet
4... Outlet 5... Washing water flow population 12
...Screw blade 13...Center shaft 14
...Rotor blade 15... Perforated disc Patent applicant Japan Tobacco Inc. Figure 1 Figure 2 Figure 14b Figure 4

Claims (1)

[Claims] A cylindrical filter is housed in a casing in which an inlet, an outlet, and a wash water inlet are formed, and a screw blade with a central axis protruding from the upper end is disposed within the filter. It is rotatably supported close to the inner surface, and a rotor and a perforated disc are attached to the upper end of the central axis of the screw blade, with the opening of the perforated disc near the outer periphery. A filtration device characterized by being provided with.