JPH06344190A - Filter - Google Patents

Abstract

PURPOSE:To securely separate an object to be filtered to a filter cake and filtrate, and to deal with various objects to be filtered by one filter medium by freely adjusting the gap of a coil spring, and pressurizing and moving the object to be filtered, which is thrown inside a filter medium. CONSTITUTION:When a filter 1 is worked, a spiral conveyer 5a starts rotating at a desired rotational speed by the drive force of a drive motor, and supplies a desired object S to be filtered from the upper part of a charging hopper 6. Then, the object S to be filtered, is gradually pressurized and passes through while it is transferred inside a coil spring 3 whose gap G is adjusted with an adjusting means 4 according to the size of the solid object of the object S to be filtered, along with the surface of a spiral conveyer 5a. In the middle of this passing through, the object S to be filtered, is separated to a filter cake K with a desired size and filtered liquid E. Therefore, the gap G of the coil spring 3, can be varied according to the size of the solid object contained in the object S to be filtered, and one filter medium 2 can be optimized to various objects S to be filtered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter for separating a mixture of liquid and solid into a filter cake of solid having a predetermined size or more and a filtrate filtered by filtration.

[0002]

BACKGROUND OF THE INVENTION Generally, a slurry or sludge.
The object to be filtered consisting of a mixture of liquid and solid called
Various filters for separating a solid filter cake of a predetermined size or more and a filtrate filtered by filtration are frequently used for separation treatment of domestic wastewater or various industrial wastewater.

Various conventional filters will be described below.

A so-called screw press is known as an example of a conventional filter. This screw press is one in which a filter material having a cylindrical sieve surface is formed by punching metal or the like having a large number of through holes of an appropriate size, and an appropriate spiral conveyor is disposed inside the filter material. The object to be filtered put into the inside of the filter medium is continuously compressed while being transferred by a spiral conveyer, and the object to be filtered is filtered by a solid filter cake of a predetermined size or more with a sieve surface and filtered. It is designed to be separated into a filtrate (solid-liquid separation).

As another example of the conventional filter, a multi-disk type is known. This multi-disc type filter is formed by laminating a large number of thin discs to form a filter medium, and the object to be filtered is a solid filter cake of a predetermined size or more with a space (gap) between the thin discs. And a filtrate filtered by filtration (solid-liquid separation).

As another example of the conventional filter, a spiral screw type is known. This spiral screw type filter is one in which a floating ring and a fixed ring are alternately combined to form a cylindrical filter medium, and an appropriate spiral conveyor is disposed inside the filter medium,
While the object to be filtered put into the inside of the filter medium is transferred by the spiral conveyor, the object to be filtered is filtered by filtration with a solid filter lump of a predetermined size or more with a gap (spacing) between the floating ring and the fixed ring. And the filtrate is separated (solid-liquid separation).

[0007]

However, in any of the above-mentioned conventional filters, although the substance to be filtered can be separated into a solid filter cake and a filtrate filtered by filtration, If the size of the filter cake changes,
Since it is not possible to replace the filter material of the filter when filtering different objects to be filtered in the morning and afternoon in the day, or when filtering different objects to be filtered depending on the season,
It is not possible to change the size of the solids separated from the object to be filtered, and therefore, it is necessary to use a plurality of filters having filter media having different sizes of the solids to be separated from the object to be filtered, or to sacrifice the filtering performance. There was a problem that it did not exist.

[0008] In addition, it is impossible to prepare a large number of testers (filters) in advance when performing a demonstration or a performance test of the filters at the customer site because the storage space and the economic burden are heavy. However, with a limited number of filters, usually one filter, there is no choice but to carry out a demonstration or performance test on an unspecified number of types of objects to be filtered, and the filter material of the filter is replaced as described above. Since it is not possible, it is difficult to make the filter medium of the tester and the filter material of the tester correspond to the optimum state, and there is a problem that the original performance of the filter cannot be exhibited.

It is an object of the present invention to provide a filter that overcomes the above-mentioned problems of the conventional one and can handle a wide variety of objects to be filtered with a single filter material.

[0010]

In order to achieve the above-mentioned object, a filter according to the present invention comprises a filter medium composed of a coil spring having a substantially cylindrical shape for separating a filter body into a filter cake and a filtrate, and It is characterized in that it has an adjusting means for making the interval adjustable and a transferring means for moving the object to be filtered introduced into the inside of the filter medium under pressure.

[0011]

According to the filter of the present invention having the above-mentioned structure, the interval of the filter medium composed of the coil spring can be adjusted freely, so that one filter medium can be used to optimally separate a wide variety of objects to be filtered. can do.

[0012]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a schematic view showing the structure of the essential part of an embodiment of the filter of the present invention, and FIG. 2 is a cross-sectional view showing an application example of the cross-sectional shape of a coil spring.

As shown in FIG. 1, in the filter 1 of this embodiment, an elastic material having a substantially quadrangular cross section is used as a filter medium 2 in a spiral shape with a desired gap (gap) G (exaggerated in the figure). The coil spring 3 is formed and has a substantially cylindrical shape as a whole. The coil spring 3 can be expanded and contracted in the axial direction by an appropriate adjusting means 4 shown on the left side of the drawing. That is, the distance G between the coil springs 3 is adjustable. As an example of the adjusting means 4, one end of the coil spring 3 is fixed to a nut screwed to a screw shaft, and the screw shaft is rotated to change the position of the nut in the axial direction of the screw shaft. The distance G between the coil springs 3 can be adjusted, but the invention is not limited to such a structure as long as the distance G between the coil springs 3 can be adjusted.

There is also provided a clogging prevention means for intermittently expanding the gap G between the coil springs 3 to prevent clogging. As a means for preventing this clogging, Japanese Patent Application No. 4-2 is used.
Although there is a structure described in Japanese Patent No. 72852, it is not limited to the structure of this prior application. Further, in addition to intermittently expanding the gap G, vibration may be applied or cleaning may be performed.

On the other hand, as the material of the coil spring 3,
It may be selected from various elastic materials such as stainless steel, aluminum, spring steel, and resin according to the design concept of the filter 1.

The cross-sectional shape of the coil spring 3 is
A shape that allows at least the inner peripheral surface of the coil spring 3 to be formed smoothly, for example, a rectangular cross section shown in FIG. 2A, an inverted triangular cross section shown in FIG. 2B, and a cross section in which the outer peripheral side shown in FIG. 2C is shorter than the inner peripheral side. A trapezoid, a circular cross section shown in d of FIG. 2 or the like may be used,
In particular, it is not limited to this embodiment.

Returning to FIG. 1, inside the coil spring 3, there is an appropriate transfer means 5 for gradually pressurizing the object S to be filtered while transferring it from the right side to the left side in the figure (pressurized transfer). The spiral conveyor 5a has coil springs 3 at both ends.
Are rotatably arranged so as to project from both ends of the. The spiral conveyor 5a is driven by an appropriate drive source such as a drive motor (not shown).

At the right end of the coil spring 3 in the drawing,
An appropriate input hopper 6 into which the substance to be filtered S is input is provided, and an appropriate output hopper for discharging the dehydrated filter cake K called a dehydrated cake is provided at the left end of the adjusting means 4 in the drawing. 7 are provided. An appropriate filtrate tank 8 is arranged below the coil spring 3.

Next, the operation of this embodiment having the above-mentioned structure will be described.

As shown in FIG. 1, when the filter 1 of this embodiment is operated, the spiral conveyor 5a starts to rotate at a desired rotation speed by the driving force of a drive motor (not shown). Then, the desired object S to be filtered is supplied from the upper part of the charging hopper 6 on the right side in the figure. Then, the object S to be filtered is
With the adjusting means 4, the inside of the coil spring 3 whose gap G is adjusted according to the size of the solid of the body S to be filtered is transferred from right to left in the figure along the surface of the spiral conveyor 5a. While being gradually pressurized (pressurized movement) and passing through, it is separated into a filter cake K having a predetermined size and a filtrate E filtered, and the filter cake K is gradually compressed and dehydrated. Dehydrated cake K called a dehydrated cake is discharged from the discharge hopper 7. Also, the filtrate E and the filter cake K filtered (separated) by the coil spring 3
The water Ea dehydrated from the water passes through the gap G of the coil spring 3 from the inside of the coil spring 3 toward the surface, and then is stored in a desired filtrate tank 8 arranged below the coil spring 3. It

Further, since at least the inner peripheral surface of the coil spring 3 of the present embodiment is formed to be smooth, the body S to be filtered and the filter cake K which come into contact with the inner peripheral surface of the coil spring 3 are transferred smoothly. be able to.

Therefore, according to the filter 1 of the present embodiment to which the filtering method of the present invention is applied, unlike the prior art, the coil spring 3 of the coil spring 3 is made to correspond to the size of the solid contained in the body S to be filtered. Since the interval G can be adjusted (variable), the object S to be filtered can be reliably filtered (separated), and one filter medium 2 is optimized for a wide variety of objects S to be filtered. be able to.

It should be noted that the adjustment of the gap G between the coil springs 3 by the adjusting means 4 may be carried out in advance according to the object S to be filtered, or while the filter 1 is in operation. , It can be selected according to the usage situation.

Further, the present invention is not limited to the above-mentioned embodiment, but can be modified as necessary.

[0026]

As described above, according to the filter of the present invention, the substance to be filtered can be surely separated into the filter cake and the filtrate, and one filter medium is used for a wide variety of substances to be filtered. It has an extremely excellent effect of being able to.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of a main part of an embodiment of a filter according to the present invention.

2A to 2D are cross-sectional views showing an application example of a cross-sectional shape of a coil spring.

[Explanation of symbols]

 1 Filter 2 Filter medium 3 Coil spring 4 Adjusting means 5 Transfer means 5a Spiral conveyor 6 Input hopper 7 Discharge hopper 8 Filtrate tank E Filtrate Ea Moisture G Interval (gap) K Filter mass S Filtered body

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical indication location B01D 29/48 7112-4D (72) Inventor Katsuyoshi Ishibashi 3-6-5 Midorigaoka, Hamura-shi, Tokyo No. Stock Company Yanagawa Giken Development Division

Claims (1)

[Claims] 1. A filter medium composed of a substantially cylindrical coil spring for separating a substance to be filtered into a filter cake and a filtrate, an adjusting means for adjusting an interval between the coil springs, and a filter medium charged inside the filter medium. And a transfer means for moving the object to be filtered under pressure.