JPH02115010A - filtration device - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a filtration device, and particularly to a filtration device using a plurality of cartridge filters.

(Prior art) Conventionally, a cylindrical cartridge filter or candle filter has been suspended and supported in an outer tank, and the liquid to be filtered is forced into the tank and passed from the outer peripheral surface of the filter to the inner surface of the filter. I-filtration devices that capture solids on the outer surface of a tank have been used in various fields, but generally the filter was fixedly installed inside an outer tank.

However, in the above-mentioned filtration device, if solid matter adheres to the outer surface of the filter to a thickness exceeding a certain value, the pressure loss increases and filtration becomes impossible.

Therefore, recently the filter itself has been rotated, so-called Ta
Some attempts have been made to generate ylor VOrteK to remove deposits from the outer surface of the filter.

(Problem to be Solved by the Invention) However, in order to remove deposits from the outer surface of the filter with a rotating structure, it is necessary to
It must be rotated at high speeds of about 0r, p, and m, which makes the structure of the filter device complex and delicate, making it expensive.In addition, in order to form the Taylor Vortex, the distance between the outer tank and the filter must be large. The problem was that only about 1 to 5III11 could be obtained, and as a result, the sludge volume could not be obtained.

In view of this, the present invention regulates the thickness of deposits on the outer surface of the filter to be within a certain value, prevents filtration from becoming impossible, and at the same time allows self-cleaning between the filters to remove the deposits. The objective is to provide a filtering device that facilitates continuous operation for long periods of time.

[Structure of the invention]

(Means for Solving the Problems) In order to solve the problems of the above-mentioned prior art, the present invention provides an outer tank having a liquid inlet for receiving the permeable liquid, and an outer tank arranged parallel to each other in the outer tank. at least two cylindrical cartridge filters; a rotation drive mechanism that rotates these cartridge filters in the same direction and revolves them all at once; a sludge receiving hopper provided below the cartridge filter; A filtered liquid discharge passage leading to a liquid outlet through which the filtered liquid is discharged through the shaft support is provided, and sludge attached to the outer surfaces of adjacent cartridge filters is removed by rotation of the outer surfaces of adjacent cartridge filters in opposite directions. It is characterized in that it can be peeled off.

(Function) When the filtrate is supplied into the outer tank and the rotation drive mechanism is driven to rotate and revolve the cartridge filter, the filtrate passes from the outer surface of the filter into the inside.
During this time, solids are trapped on the outer surface of the filter. If the solid matter attached to the outer surface of a cartridge filter exceeds a certain thickness, it will interfere with the deposits attached to the outer circumferential surface of an adjacent cartridge filter and rub against each other. Since the adjacent cartridge filters rotate in opposite directions, they rotate past each other.
A shearing action occurs in this portion to peel off the deposits, and a self-cleaning action is performed between the cartridge filters.

(Example) The present invention will be described below with reference to embodiments shown in the drawings.

The embodiment shown in FIG.
In the figure, three lines are shown for convenience. ) cylindrical cartridge filters 2, 2, . A sludge discharge valve 5 is provided at its lower end. In addition, a liquid inlet 6 for supplying the liquid to be filtered is opened in the tangential direction at the upper side of the outer tank 1, and the liquid to be filtered is fed into the outer tank 1 through a supply pipe 7 connected to this liquid inlet 6. It is designed to generate a swirling flow and supply it.

The rotational drive mechanism 8 that rotates and revolves the cartridge filters 2, 2, etc. has a bearing 10 mounted on a bearing cylinder 9 fixed to the outer tank 1, as shown in FIG. A shaft cylinder portion 12 of a rotary member 11 is rotatably suspended via a shaft 10, and each cartridge filter 2°2... The upper and lower ends of the central shaft 14 are supported.

A gear 15 is fixed to the outer periphery of the portion of the shaft cylindrical portion 12 that protrudes outside the outer tank 1, and a gear 18 rotated by a motor 17 on a mount 16 via a reducer 18 is attached to the gear 15.
A is engaged.

The cartridge filter 2 has a sleeve 19 with respect to the shaft 14.
A gear 20 fixed to the outer periphery of the sleeve 19 is always meshed with an internal gear 21 fixed to the inner periphery of the outer tub 1, so that the rotating member 11 rotates. When the cartridge filter 2 revolves, the internal gear 2
The gear 20 meshing with the cartridge filter 2 rotates and the cartridge filter 2
is designed to rotate.

There is a gap between the inner periphery of the sleeve 19 and the shaft 14, and an opening 22 is provided in the upper side of the sleeve 19 to communicate with the inside of the shaft cylindrical portion 12, and the cartridge filter 2
A filtered liquid discharge passage 24 that communicates with a liquid outlet pipe 23 fixedly installed in the upper part of the outer tank 1 through the inner sleeve 19 and the bearing cylinder 12.
It consists of

Next, the operation of the above embodiment will be explained.

When the filtered liquid is supplied into the outer tank 1 through the supply pipe 7 and the motor 17 of the rotational drive mechanism 8 is driven, the gear 18
The rotating member 11 is rotated, for example, in the direction of the arrow A in FIG. 2 through the cartridge filters 2, 15.
2... revolves. At this time, cartridge filter 2
, 2, . . . rotate while meshing with the internal gear 21, each cartridge filter 2, 2, . . . rotates in the direction of arrow B in FIG. 2, respectively.

During this time, the liquid to be filtered is transferred to each cartridge filter 2゜2...
The solids contained in the liquid to be filtered are captured on the outer surfaces of the cartridge filters 2.2.... The filtered liquid that has entered the cartridge filter 2゜2... is transferred to the sleeve 19, the opening 22, and the rotating member 11.
A liquid outlet pipe 23 passes through a filtered liquid discharge passage 24 leading into the
is discharged to.

When solid matter adheres to the outer surface of the cartridge filters 2, 2 to a certain thickness or more, the deposits on the adjacent cartridge filters 2, 2 come into contact with each other, and the part of the cartridge filter 2.2 that comes in contact with the deposits. Therefore, the thickness of the deposits does not increase any further and impossibility of filtration is prevented. Further, since the parts of the cartridge filter 2.degree. 2 that come into contact with deposits rotate in opposite directions and rotate past each other, a shearing action occurs in these parts, and the surface layer of deposits is actively peeled off, thereby performing a self-cleaning action. The separated solid deposits accumulate in the sludge receiving hopper 4 at the bottom of the outer tank 1, and can be discharged as sludge by opening the sludge discharge valve 5 at a timely manner.

This is the number of teeth N of the internal gear 21. -40 and the number of teeth of the gear 20 is N1-15, the following relationship holds true.

That is, when the central shaft 3 rotates once clockwise, the gear 20 rotates 12/3 counterclockwise.

In general, it is preferable that the rotational speed of the central shaft 3 be 100 r, p, m or less in view of the durability of the mechanical seal and the like. In this way, the central axis 3 is 100r, p.

m, the rotation of the gear 20 is 100X12/3==1
67r, p, m, and if the outer diameter of the cartridge filter 2 is 50Il/I, the hourly circumferential speed of the cartridge filter 2 is 50XπXXl67-26219a/sin, which is about 0.4m/see. Therefore, the relative speed between the outer circumferential surfaces of the two cartridge filters 2, 2 is doubled to 0.8 m 2 /see. In this way, even with low rotational driving, the relative speed of the circumferential speed of the cartridge filter 2.2 is increased, and at the same time, the rotational force due to the revolution is prevented from adhering to the outer surface, thereby maintaining the filtering ability.

Fig. 4 shows an embodiment in which the filtration device is of a horizontal type.
The forms are different. That is, the hopper 4 for receiving sludge is provided at a position directly below the circumferential surface of the cartridge filters 2, 2, . . . at the lower circumferential surface of the outer tank 1. Other configurations and operations are similar to those of the vertical type shown in FIG. 1, so parts corresponding to those in FIG.

In any of the above embodiments, the gears 20 of the cartridge filters 2, 2, . . .
Although the case is shown in which the rotation is given by the revolving movement of the cartridge filters 2, 2..., a sun gear is provided at the center of the outer tank 1, and the gears 20 of the cartridge filters 2, 2... are meshed with this. It is also possible to give it rotation.

〔Effect of the invention〕

As explained above, according to the present invention, a plurality of cartridge filters arranged parallel to each other in the outer tank are rotated in the same direction and revolved simultaneously, so that the outer surface of each cartridge filter The thickness of the deposits that adhere to the cartridge filters does not become thicker than 1/2 of the interval between the cartridge filters, and therefore the maximum thickness of the deposits does not exceed a certain thickness on the outer surface of the cartridge filter. If the interval between the cartridge filters is set so that it is below the allowable excessive resistance value, continuous operation is possible without filtration becoming impossible. Also, since the adjacent parts of each cartridge filter rotate past each other,
The shearing action at this portion causes an active peeling off of deposits adhering to the outer surface of the cartridge filter, which has excellent effects such as maintaining the overcapacity of the filter.

Figure 2 is an enlarged plan view of the same half section;
FIG. 3 is a sectional view taken along the line ■--■ in FIG. 2, and FIG. 4 is a longitudinal sectional view schematically showing a part of the embodiment in the same area.

1...Outer tank, 2...Cartridge filter, 3...
- Central shaft, 4... Sludge receiving hopper, 6... Liquid inlet, 8... Rotation drive mechanism, 20... Gear, 21.
...Internal gear, 24...Filtered liquid discharge passage.

Applicant's representative: Mr. Sato

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the filtration device according to the present invention. FIG.

Claims (1)

[Claims] an outer tank having a liquid inlet for receiving the liquid to be filtered; at least two cylindrical cartridge filters disposed in parallel to each other within the outer tank; A rotational drive mechanism for revolving the cartridge filter, a hopper for receiving sludge provided below the cartridge filter, and a filtered liquid discharge passage leading to a liquid outlet for discharging the filtered liquid through the shaft support of the cartridge filter, and an adjacent A filtration device characterized in that a surface layer of sludge adhering to the outer surface of the cartridge filter is peeled off by rotating the outer surfaces of the cartridge filters in mutually opposite directions.