For the deep bed filtration, the present invention is to control the density or size of the filtering media pores by arranging and inserting a filtering media with different length, or by using a conical filtering media case, or by using a compressing device which compresses the filtering media case.

BACKGROUND ART Generally, operation of a filtering device comprises filtering and backwashing.

Widely filtration means the separation of the suspended solid and the liquid particle in the fluid. Narrowly it means an operation for separating a solid particle out of liquid such as water, which means the mechanical operation to separate each other, i. e., the solid is deposited at a surface or inside of a filtering media, and liquid is permeated by making a liquid compound including a solid particle be passed through a porous filtering media.

Although the filtration hereunder is that of a narrow meaning, the limitation of the present invention is not defined thereon.

The said narrow meaning of the filtration is a process of capturing and eliminating suspended materials in the raw water containing a corpuscle, seaweed etc. with the physical and chemical operation such as diffusion, isolation, collision of inertia,

precipitation, cohesion and absorption at the filtering layer in which is filled with filtering media.

During the process of filtration, suspended materials are deposited at the filtering layer, and hereby pores at the filtering layer are decreased, and filtration resistance is occurred. Because the said filtration resistance decreases the filtering efficiency, the process of backwashing is necessary.

Accordingly, the capacity of the filtering device is determined with the process of the filtering and the backwashing. In detail, it is determined with the suspended material eliminating efficiency, the size of the eliminated particle, speed and consistent time of filtering, the frequency of the backwashing, the amount of the water of the backwashing, the time of the backwashing.

Though generally a granular material such as sand, anthracite, activated carbon, clay, pulverized magnetite, garnet and inactive material are used as a filtering media, there is a problem that those kinds of materials need a big filtering device and an installation area.

Moreover, the pore of a layer is often decreased and blocked by the suspended materials because the filtering media particularly has a fixed pore structure and the suspended materials are mainly captured nearby surface, in addition, the frequency of backwashing increases and the speed of filtering decreases, because the loss of pressure increases by filtration resistance.

To solve the problems of the conventional system, the revolving backwashing precision filtering device (Korean Patent Application No.: 10-1997-023068) which was previously applied was introduced, the said invention has a structure to filter and backwash with for-rev revolving drum, by adhering an end of a textile filter which is attached radially at the side of the porous drum revolving body to the revolving spring which is fastened on the pressuring device, However, the said filtering device has problems that the textile filter is easily damaged caused by friction, and the frequency of back washing is increased because the filtering consistent time is short caused by having a small particle capturing space, and it is hard to manage the change of the quality of the raw water.

In additional, the permanent filtering device (Korean Patent Application No. :

1998-0405542) was developed to have a variable filtering layer which is a filtering device that a textile filter is compressed and filtered by the supply pressure of raw water, and backwashed by the relaxation caused by the compressed air and water pressure of backwashing. However, this system has problems that not only the filtering media, a textile, is easily damaged and snarled in the process of repeating compress and relaxation in the piston, but also the filtering consistent time is short, the frequency of backwashing is increased, the speed of filtering is not high, and it is hard to manage the change of the quality of the raw water because it has a small particle capturing space and less quantity of captured particles caused by having a single layer during the operation of filtering.

DISCLOSURE OF INVENTION Accordingly, the present invention is directed to a deep bed filter cartridge that substantially obviates one or more of problems due to limitations and disadvantages of the related art.

An object of the present invention is to provide a deep bed filter cartridge that has durable textile filter, sufficient particle capturing space and long filtering consistent time, and is easy to backwash and convenient in managing the change of quality of the raw water.

Namely, an object of the present invention is to provide a deep bed filter cartridge that the size of the particles captured at the different parts of a filtering media is divided because the pore density of the filtering media at the flow-in part and the discharge part is different each other.

Another object of the present invention is to provide a deep bed filter cartridge that is easy to backwash.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, a deep bed filter cartridge according to the present invention comprises a cylindrical filtering media case which raw water flows in and is discharged from; a filtering media bundle which is a bundle of textiles being inserted inside the filtering media and filtering the raw water, and both ends of which are fastened by support strings; a media fastening device which is a porous board combined with the inflow part and the discharge part of the filtering media case, which comprises a inflow part filtering media fastening device and a discharge part filtering

media fastening device, which the support strings of the said filtering media bundle are combined with, and which fastens the plural filtering media bundles to the inside of the filtering media case with the support strings. Then the filtering media bundles of a different length are inserted to form a filtering layer in the said filtering media case. It is advisable all the filtering media bundles are closely combined together around the said discharge part filtering media fastening device, and the density of average filtering media is getting higher as closer to the discharge part.

The present invention comprises a filtering media case which is a conical case with trapezoid cross-section, and the relatively wider end side of the conical case becomes the inflow part and the narrower becomes the discharge part; a filtering media bundle which is a bundle of textiles being inserted inside the filtering media and filtering the raw water, and the both ends of which are fastened by support strings; a filtering media fastening device which is a porous board combined with the inflow part and discharge part of the filtering media case, which is divided into inflow part filtering media fastening device and discharge part filtering media fastening device, which the support strings of the said filtering media bundle are combined with, and which fastens the plural filtering media bundles to the inside of the filtering media case with the support strings.

And then it is advisable to be a deep bed filter cartridge featuring that the density of the filtering media of the inflow part of the said media case is low caused by the wide diameter, in the other hand, the density of the filtering media of the discharge part of the said media case is high caused by the narrow diameter.

And the present invention comprises a filtering media case, as a cylinder which the raw water flows in and is discharged from, being made of a flexible material to be bent; a filtering media bundle which is a bundle of textiles being inserted inside the filtering media and filtering the raw water, and the both ends of which are fastened by support strings; a filtering media fastening device which is a porous board combined with the inflow part and discharge part of the filtering media case, which is divided into inflow part filtering media fastening device and discharge part filtering media fastening device, which the support strings of the said filtering media bundle are combined with, and which fastens the plural filtering media bundles to the inside of the filtering media

case with the support strings; and a compressing device which compresses the said filtering media case selectively at the front or side. Then the density of the filtering media in the filtering media case can be changed by compressing the filtering media case with the compressing device in accordance with the pollution level of the raw water.

It is advisable that the plural compressing devices are formed at the front or side of the filtering media case. It is advisable that the compressing device is high pressure air injected through a high pressure air injection nozzle which is inserted into the hermetically sealed outer case in which the filtering media case.

BRIEF DESCRIPTION OF DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. In the drawings: Fig. 1 is a cross-sectional view illustrating a deep bed filter cartridge according to the first embodiment of the present invention; Fig. 2 is a cross-sectional view illustrating a deep bed filter cartridge according to the second embodiment of the present invention; Fig. 3 is a cross-sectional view illustrating a deep bed filter cartridge according to the third embodiment of the present invention; and Fig. 4 is cross-sectional view illustrating a deep bed filter cartridge according to the fourth embodiment of the present invention.

Description of important eliments of the drawings> 1: filtering media bundle 3: filtering media case 32: outer case 5 : compressing devise 51 : high pressure air injection nozzle 6 : filtering media fastening devise 61 : inflow part filtering media fastening device 62: discharge part filtering media fastening device

BEST MODE FOR CARRYING OUT THE INVENTION Reference will now be made in detail to the preferred embodiment of the present invention, which is illustrated in the accompanying drawings.

Fig. 1 is a cross-sectional view illustrating a deep bed filter cartridge according to the first embodiment of the present invention.

As shown in the figure, the filtering media case (3) is a cylindrical case which raw water flows in and is discharged from. The filtering media case (3) is not defined to be the shape of cylinder. The raw water is the water that contains suspended materials and needs to be filtered. The filtering media bundle (1) is a bundle of textiles the both ends of which are fastened with support strings (12). When raw water flows into the bundle of textiles, the suspended materials in the water are filtered by the textiles. Then the water is purified. The filtering media fastening device (6) is a porous board combined with inflow part and discharge part, and it is divided into an inflow part filtering media fastening device (61) and a discharge part filtering media fastening device (62).

The plural filtering media bundles (1) are arranged at the inside of the filtering media case (3), and it is fastened to the media case (6) with the support strings (12). The filtering media fastening device (6) is combined to the both ends of the filtering media case (3), and the plural support strings (12) of the filtering media bundle (1) are connected and combined, and it makes the filtering media bundle (1) to be fastened to the filtering media case (3). The filtering media fastening device (6) is advisable to be the porous board not to be an obstacle against the flowing of raw water. In the filtering media case (3) of the present invention forms a layer by inserting the filtering media bundles (1) of different length uniformly. Hereupon, the end portion of the long filtering media bundles (1) is scattered and forms a layer at the inflow part of the filtering media case (3). As closer to the discharge part, the filtering media bundles (1) are more compressed and form a layer, thus the density of the filtering media at the inflow and discharge part is different from each other. It is advisable to make media density to be changed linearly from inflow part to discharge part, by making one side of the filtering media bundles (1) hang down the support strings (12), and connecting them to the inflow part filtering media fastening device (21), and making the filtering media bundles (1) reach to the discharge part filtering media fastening device (62).

According to the composition of the present invention explained hereupon, because the filtering media density is getting higher as it is closer to the discharge part, the size of pore which captures suspended materials is getting smaller as closer to the discharge part, thus relatively big suspended materials are filtered around inflow part and small ones are filtered around discharge part. In detail, when the raw water is

flowed into the inflow part, the bigger suspended materials are filtered at the inflow part where density of the filtering media is relatively low, and the smaller ones are filtered at the discharge part where the density of the filtering media is relatively high. Therefore it provides a deep bed filter cartridge that selectively determines the location of filtering in accordance with the size of the suspended materials. That is, according to the present invention, because the suspended materials are executed deep bed filtration along the length direction of the filtering media case (3), as relatively big suspended materials are captured at the inflow part where a big pore is formed, and as closer to discharge part, the smaller are captured, it has advantage that the layer which is a practical material capturing space is formed over whole filtering media.

That deep bed filtering improves the cleansing efficiency of the filtering media considerably, in detail, when the cleansing water or high pressure air is mixed and injected with high pressure independently or simultaneously, the suspended materials are discharged through the inflow part. As the cleansing water and high pressure air flows from small pore to big pore of the layer, there is no filtration resistance and it makes the process of washing easier. The efficiency of the backwash improves the duration of filtering media and raises the treatment efficiencies of raw water.

Fig. 2 is a cross-sectional view illustrating a deep bed filter cartridge according to the second embodiment of the present invention.

As it is shown in the Fig. 2, the present invention comprises a filtering media case (3), a filtering media bundle (1) and a filtering media fastening device (6). The feature of the present invention illustrated in Fig. 2 is that a filtering media case is a conical case with trapezoid cross-section, and relatively wider a cylindrical surface becomes the inflow part and the narrower becomes discharge part. The feature of the present invention illustrated in Fig. 2 is the media case that is conical case with trapezoid cross-section, and the wider cylindrical surface forms an inflow part and the narrow part becomes a discharge part. The filtering media bundle (1) is fixed by filtering media fastening device (6) and inserted in the filtering media case (3). The filtering media bundles are advisable to be the same length, but it is also advisable to arrange the filtering media bundles of different length uniformly such as the present invention. The filtering media bundle (1) which is inserted in the conical filtering media case (3) forms small pores at the discharge part caused by being compressed by the narrow inside diameter, in the other hand, it forms big pores at the inflow part caused by wide inside diameter. So to speak, according to Fig 2, it is provided a deep bed filter cartridge of which the size of filtering media pores is getting smaller as closer to the discharge part.

During inflowing raw water in the inflow part of the deep bed filter cartridge, suspended materials are executed with the deep bed filtration caused by size of pores which get smaller as closer to discharge part, and during backwashing, if the high pressure

cleansing water is injected through the discharge part, the suspended materials which have been executed deep bed filtration is washed.

Fig. 3 is a cross-sectional view illustrating a deep bed filter cartridge according to the third embodiment of the present invention.

As it is shown in the Fig. 3, the present invention comprises the filtering media case (3), the filtering media bundle (1), the filtering media fastening device (6) and the compressing device (5). The filtering media case (3) is shaped into a cylinder which raw water flows in and is discharged from, being made of flexible material to be bent. In the filtering media case (3), the filtering media bundle (1) is inserted and fixed by filtering media fastening device (6). The filtering media fastening device (6) is a porous board combined with the inflow part and the discharge part of the filtering media case (3), which comprises the inflow part filtering media fastening device (61) and the discharge part filtering media fastening device (62). The compressing device (5) in the Fig. 3 compresses the filtering media case (3) selectively at the side or front side. The said device comprises a stick or a bite, and the detailed description will be omitted herein because it can be made with conventional technology and technically has no direct relation with the present invention. The present invention of the Fig. 3 provides the variable packing factor of the filtering media in accordance with the necessary of filtering, as forming a selective curved part mechanically at the deep bed filter cartridge. So to speak, it performs the general filtering without operation of the compressing device (5) and if there is necessary of the deep bed filtering in accordance with pollution level or a feature of the size distribution of the suspended materials, it forms curving part by compressing or curving the filtering media case (3) to execute the deep bed filtering by varying the size of the pores. According to the present invention in the Fig 3, at least 1 curved part is formed at a cartridge where the packing factor of filtering media is getting higher or same as closer to discharge part and raw water is executed deep bed filtering by crossing through the filtering media, thus the filtering efficiency is improved. During cleansing operation, the backwashing efficiency can be also improved by eliminating the curved part.

Fig. 4 is cross-sectional view illustrating a deep bed filter cartridge according to the fourth embodiment of the present invention, illustrating that the said compressing device is operated with air pressure.

As it is shown in the Fig4, it is considerable that the filtering media case (3) is inserted in the hermetically sealed outer case (32), and the air pressure is used as the compressing device which is injected through a high-pressure air injecting nozzle (51) inserted into the said outer case (32). According to the present invention, it is possible to increase the speed and the efficiency of the filtering by deep bed filtering the raw water and varying the degree of filtering in accordance with the quality of the raw water.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

INDUSTRIAL APPLICABILITY According to the present invention, the deep bed filter cartridge provides a durable filtering media, sufficient particle capturing space, easy backwash and long filtering consistent time, and is easy to manage the change of quality of raw water.

According to the present invention, the deep bed filter cartridge can use the whole space of the layer as the particle capturing space because the filtering media density is getting higher gradually from inflow part to the discharge part.

According to the present invention, the deep bed filter cartridge filters suspended materials of different sizes in accordance with the portion of the filtering media.

In addition, according to the present invention, the deep bed filter cartridge provides easy backwash.