WO2009142389A1

WO2009142389A1 - Filtration device having variable filter

Info

Publication number: WO2009142389A1
Application number: PCT/KR2009/001567
Authority: WO
Inventors: Soo Whoan Jeong
Original assignee: Soo Whoan Jeong
Priority date: 2008-05-22
Filing date: 2009-03-27
Publication date: 2009-11-26
Also published as: CN101959570B; CN101959570A; KR100875389B1

Abstract

Disclosed is a filtration device having a variable filter according to the present invention including a cylindrical housing 100; a plurality of cylindrical filters 210 and 220 which are serially disposed in the housing 100; an upper supporting plate 230 for supporting an upper side of the uppermost filter 210; a compressing plate 240 for supporting a lower side of the lowermost filter 220; a supporting rod 250 which is fixed to the upper supporting plate 230 and an lower end of the housing 100 and installed to pass through the filters 210 and 220; and a compressing means 300 which lifts up or down the compressing plate 240 so as to control pores of the filters 210 and 220 when filtering raw water.

Description

FILTRATION DEVICE HAVING VARIABLE FILTER

The present invention relates to a filtration device having a variable filter, and more particularly, to a filtration device having a variable filter, which can vary a pore size of the filter through compression force when filtering raw water.

Generally, a filter used in a pre-filtering process for filtering raw water is classified into a disposable filter and a semi-permanent filter which is recycled by periodic back-washing. However, since the disposable filter has a disadvantage of increasing maintenance cost due to frequent replacement, the use of the semi-permanent filter is increased. But, the semi-permanent filter also has a disadvantage in that, if it has small-sized pores, it has low recycling efficiency even though the back-washing is carried out, and if it has large-sized pores, it has high recycling efficiency but filtering efficiency with respect to minute particles is deteriorated. To solve the problems, there has been recently proposed a variable filter which reduces a filter pore size when filtering raw water and increases the filter pore size when recycling the filter through the back-washing. In the variable filter, the pore size is typically adjusted by using a fiber rope. In the pore size controllable filtration device using a fiber rope, the fiber rope formed of various kinds of fibrous filter mediums is fixed to a cover of reactor by a fiber rope support and a clamp so as to control a gap between the fiber ropes to be reduced or increased by a clamp screw and the clamp connected with the cover. However, in this type, since it is limited to control the gap and the fiber rope may be broken or loosened and also the gap may be widened, and thus the filtering efficiency becomes unstable. Meanwhile, after unfastening the clamp and loosening the fiber rope, the filter can be recycled by the back-washing. However, the fiber rope may be loosened due to repeat fastening and unfastening of the clamp. To solve the problem, it is necessary to replace the fiber rope. In this case, the general purpose of it intended to semi-permanently use consumption goods through the back-washing is deformed, and also increase in the maintenance cost is unavoidable.

An example of a filtration device that controls a filter pore using a variable filter is disclosed in Japanese Patent Publication No.sho 55-4711.

The filtration device includes a main body formed with a raw water inlet port and a filtered water outlet port, a plurality of porous filters provided in the main body and formed with a hollow portion, and a filter pressing unit that functions to press the porous filters when filtering raw water and to release the porous filters when washing the filters.

In order to prevent the filter from being wrenched when the filter is pressed by the filter pressing unit, i.e., constantly maintain the pressing force of the filter pressing unit, the filtration device includes a flange portion formed at each of a plurality of supporting plates for directly pressing the filter by movement of the filter pressing unit, and a guide portion which is engaged with the flange portion so as to guide the supporting plate. However, since this structure for preventing the filter from being wrenched is complicated, it is difficult to manufacture it. Further, when the pressing force applied to the filter is released for the back-washing, since the filter is returned to its position by only its own restoring force and also the filter contains the raw water, it takes much time for restoring the position, if the worst case, the filter may be not restored to its position.

An object of the present invention is to provide a filtration device having a variable filter which has a simple structure for preventing the filter from being wrenched when the filter is pressed by the filter pressing unit, thereby facilely manufacturing it.

Another object of the present invention is to provide a filtration device having a variable filter which can reduce time for restoring the filter upon back-washing, thereby reducing a washing time of the filter.

To achieve the above objects, the present invention provides a filtration device having a variable filter, including a cylindrical housing 100 which is formed with a raw water inlet port 110 and a filtered water outlet port 120; a plurality of

cylindrical filters

210 and 220 which are formed of a foaming resin, and serially disposed in the housing 100, and has a hollow portion in which raw water is filtered and introduced, and has at least two or

more insertion holes

211 and 221 which are radially arranged; an upper supporting plate 230 which supports an upper side of the uppermost filter 210 and is communicated with the filtered water outlet port 120; a compressing plate 240 which supports a lower side of the lowermost filter 220 and is formed with a coupling hole 241 corresponding to the

insertion hole

211, 221; a supporting rod 250 of which one end is fixed to the upper supporting plate 230 and the other end is fixed to an lower end of the housing 100, and which is inserted into the insertion hole of the

filters

210 and 220 and also the coupling hole 241 of the compressing plate 240; and a compressing means 300 which applies the compressing force to the

filter

210, 220 by lifting up the compressing plate 240 so that a pore size of the

filter

210, 220 is reduced upon filtering of the raw water, and releases the compressing force by lifting down the compressing plate 240 so that the pore size of the

filter

210, 220 is increased upon back-washing.

Preferably, the supporting rod 250 is formed with a plurality of holes 251 and also provided with a compressed air supplying means for supplying compressed air to the supporting rod 250 and assisting restoration of the

filter

210, 220 by the compressed air discharged through the hole 251 when the compressing plate 240 is lifted down by the compressing means 300.

Preferably, the housing 100 further comprises a back-washing inlet port 130 which is formed at the upper side of the upper supporting plate 230 so as to be communicated with the upper supporting plate 230.

Preferably, the filtration device further includes a filter supporting plate 260 which is disposed at an upper side of the uppermost filter 210 and a lower side of the lowermost filter 220 and between the

filters

210 and 220 so as to disperse the compressing force applied to the

filter

210, 220 and also communicate the

filters

210 and 220 with each other.

Preferably, the housing 100 is provided with an observing window 140 for observing an internal portion of the housing 100.

Fig. 1 is a perspective view of showing an external appearance of a filtration device having a variable filter according to the present invention.

Fig. 2 is a perspective view showing an outer structure of the filtration device having the variable filter according to the present invention.

Fig. 3 is a perspective view showing an inner structure of the filtration device having the variable filter according to the present invention.

Fig. 4 is a partial cross-sectional view of the filtration device having the variable filter upon a filtering process according to the present invention.

Fig. 5 is a partial cross-sectional view of the filtration device having the variable filter upon a back-washing process according to the present invention.

[Detailed Description of Main Elements]

100: housing 110: raw water inlet port

120: filtered water outlet port 130: back-washing water inlet port

140: observing window 210, 220: filter

211, 221: insertion hole 230: upper supporting plate

240: compressing plate 241: coupling hole

250: supporting rod 251: hole

260: filter supporting plate 300: compressing means

Hereinafter, the embodiments of the present invention will be described in detail with reference to accompanying drawings. In the description of the present invention, the relevant well-known functions or structures may be omitted if it is determined that they make unclear the subject matter of the present invention.

Fig. 1 is a perspective view of showing an external appearance of a filtration device having a variable filter according to the present invention, Fig. 2 is a perspective view showing an outer structure of the filtration device having the variable filter according to the present invention, Fig. 3 is a perspective view showing an inner structure of the filtration device having the variable filter according to the present invention, Fig. 4 is a partial cross-sectional view of the filtration device having the variable filter upon a filtering process according to the present invention, and Fig. 5 is a partial cross-sectional view of the filtration device having the variable filter upon a back-washing process according to the present invention.

As shown in drawings, a filtration device having a variable filter according to the present invention includes a cylindrical housing 100; a plurality of

cylindrical filters

210 and 220 which are serially disposed in the housing 100; an upper supporting plate 230 for supporting an upper side of the uppermost filter 210; a compressing plate 240 for supporting a lower side of the lowermost filter 220; a supporting rod 250 which is fixed to the upper supporting plate 230 and an lower end of the housing 100 and installed to pass through the

filters

210 and 220; and a compressing means 300 which lifts up or down the compressing plate 240 so as to control pores of the

filters

210 and 220 when filtering raw water.

The housing 100 is comprised of a cylindrical frame 101, a lower plate 102 and an upper plate 103. The

filters

210 and 220 are disposed in the cylindrical frame 101, and the compressing means 300 for compressing the

filters

210 and 220 is disposed at a lower side of the lower plate 102.

A raw water inlet port connected with a supporting line through which the raw water to be filtered is supplied is formed at a lower side of the cylindrical frame 101, and a filtered water outlet port 120 connected with a discharging line through which the filtered water is discharged to an outside is formed at an upper side of the cylindrical frame 101.

Preferably, a back-washing water inlet port 130 is formed at the upper side of the cylindrical frame 101 so as to be connected with a line through which back-washing water is supplied.

Preferably, an observing window 140 for observing an internal portion of the housing 100 is provided at a side of the cylindrical frame 101. Therefore, it is possible to check a filter state and an operation state of the compressing means 300 through the observing window 140.

The lower plate 102 is assembled to the lower end of the cylindrical frame 101. At the lower plate 102, there are provided a supporting leg 102a extended downward so as to support the housing 100 and a drain pipe 104 for draining water when replacing the

filters

210 and 220.

The upper plate 103 is assembled to an upper end of the cylindrical frame 101. At the upper plate, there are provided a pressure gauge 105 for checking inner pressure of the housing 100 and an air vent 106 for removing remaining pressure in the housing 100.

The

filters

210 and 220 are formed into a cylindrical shape and formed of a foamable resin like urethane. In general, the foamable resin has elastic force and restoring force.

The

filters

210 and 220 are serially provided in the housing 100 so as to filter the raw water introduced through the raw water inlet port 110. Each

filter

210, 220 has a hollow portion in which the raw water is filtered and introduced, and also has at least two or

more insertion holes

211 and 221 which are radially arranged.

The upper supporting plate 230 supports the upper side of the uppermost filter 210 and is communicated with the filtered water outlet port 120. The filtered water treated by the

filter

210, 220 is discharged through the upper supporting plate 230 to the filtered water outlet port 120.

The compressing plate 240 supports the lower side of the lowermost filter 220 and is formed with a coupling hole 241 corresponding to the

insertion hole

211, 221.

One end of the supporting rod 250 is fixed to the upper supporting plate 230, and the other end is fixed to the lower end of the housing 100. The supporting rod 250 is inserted into the

insertion hole

211, 221 of the

filter

210, 220 and also the coupling hole 241 of the compressing plate 240.

If the

filters

210 and 220 are compressed by the compressing plate 240 lifted up by the compressing means 300 while being guided by the supporting rod 250, the

filters

210 and 220 are compressed by constant pressure without being wrenched.

Preferably, the supporting rod 250 is formed with a plurality of holes 251 and also provided with a compressed air supplying means (not shown) for supplying compressed air to the supporting rod 250 and assisting the restoration of the

filter

210, 220 by the compressed air discharged through the hole 251 when the compressing plate 240 is lifted down by the compressing means 300. The compressed air supplying means for supplying, for example, compressed air is already well-known in the art.

Therefore, if the compressing force applied to the

filter

210, 220 is released by the lifting down of the compressing plate 240 after the

filter

210, 220 performs the filtering operation while being compressed by lifting up of the compressing plate 240, since the

filter

210, 220 contains the raw water, the restoring force is reduced. At this time, if the compressed air is supplied to the supporting rod 250 and discharged through the hole 251, the restoring force of the

filter

210, 220 is enhanced by the compressed air. Thus, the time for restoring the

filter

210, 220 is reduced, and thus the back-washing time is also reduced. Furthermore, it is possible to prevent the

filter

210, 220 from being not restored, thereby increasing back-washing efficiency.

The compressing means 300 functions to apply the compressing force to the

filter

210, 220 by lifting up the compressing plate 240 so that a pore size of the

filter

210, 220 is reduced upon the filtering process of the raw water, and release the compressing force by lifting down the compressing plate 240 so that the pore size of the

filter

210, 220 is increased upon the back-washing process.

A cylinder arm 310 connected through the lower plate 102 with the compressing plate 240 is provided at an upper side of the compressing means 300. The compressing plate 240 receives the compressing force through the cylinder arm 310 from the compressing means 300 so as to be lifted up and down in the housing 100, thereby applying or releasing the compressing force with respect to the

filter

210, 220. The upper supporting plate 230 having a hollow 231 is disposed at the upper side of the uppermost filter 210 so as to support the compressing force applied to the

filter

210, 220.

A filter supporting plate 260 is disposed at an upper side of the uppermost filter 210 and a lower side of the lowermost filter 220 and between the

filters

210 and 220 so as to disperse the compressing force applied to the

filter

210, 220. The filter supporting plate 260 also functions to communicate the

filters

210 and 220 with each other. Since the compressing force applied by the compressing means 300 is disperse and then supplied to the

filter

210, 220, the pore size of the

filter

210, 220 becomes uniform. Further, due to the dispersion of the compressing force applied by the compressing means 300, it is prevented that the

filter

210, 220 is deformed.

The filter supporting plate 260 is formed of an elastic material. Therefore, the compressing force applied to the

filter

210, 220 is dispersed to thereby prevent the deformation of the

filter

210, 220, and the filter supporting plate 260 is air-tightly contacted with the filter 210, 200 so as to also function as a sealing member.

Preferably, the filter supporting plate 260 is formed with a hollow coupling portion (not shown) which is coupled to the

filter

210, 220 so as to be inserted into an inner circumference of the

filter

210, 220.

The two filters are illustrated in the drawings, but the number of the filters is not limited to this. If multiple filters are provided, the filter supporting plate 260 is respectively provided between every two filters so as to equally disperse the compressing force and thus uniformly form the pore size.

Hereinafter, an operation of the filtration device having the variable filter will be described.

In the filtering process, as shown Fig. 4, if the compressing force is applied to the

filter

210, 220 by lifting up the compressing plate 240 through the compressing means 300, the

filter

210, 220 is compressed while being supported by the supporting rod 250 and thus the pore size of the

filter

210, 220 is reduced. If the raw water is introduced through the raw water inlet port 110 to an outer surface of the

filter

210, 220, substances having a larger size than the pore size are remained at the outer surface of the

filter

210, 220, and the filtered water passing through the

filter

In the back-washing process, as shown in Fig. 5, if the compressing force is released from the

filter

210, 220 by lifting down the compressing plate 240 through the compressing means 300, the pore size of the

filter

210, 220 is also restored, as the

filter

210, 220 is restored. In order to enhance the restoring force of the

filter

210, 220, the compressed air is supplied to the supporting rod 250 by the compressed air supplying means. Therefore, the

filter

210, 220 is rapidly restored to its original state by the compressed air discharged through the hole 251.

In a state that the

filter

210, 220 is restored, if the back-washing water is supplied through the back-washing water inlet port 130, the back-washing is flowed from an inside of the

filter

210, 220 to an outside thereof through the upper supporting plate 230, and then discharged along with the impurities through the raw water inlet port 110.

As described above, since the present invention uses the foamable resin filter having excellent contractibility and elasticity and also the large pore size which can observe with the naked eye, it is possible to improve the back-washing efficiency, and since it is possible to constantly maintain the pore of the filter through the compressing force of the compressing means and the filter supporting plate, it is also possible to increase the filtering efficiency. Further, since the filter is compressed while being supported by the supporting rod, the compressing force of the compressing means 300 is uniformly transmitted, thereby preventing the wrenching of the filter.

Further, since the present invention uses the compressing force of the compressing means, a separate unit is not additionally needed, and the filtration device having the variable film has a wide range of application design and can be manufactured at a low price.

Further, since the filter is restored by using the compressed air when releasing the compressing force applied to the filter for the back-washing process, it is possible to reduce the restoring time and also the back-washing time. Furthermore, since it is possible to prevent the

filter

210, 220 from being not restored, it is possible to increase the back-washing efficiency.

In addition, since the present invention uses the back-washing, it is possible to save the maintenance cost.

Claims

A filtration device having a variable filter, comprising:

a cylindrical housing 100 which is formed with a raw water inlet port 110 and a filtered water outlet port 120;

a plurality of cylindrical filters 210 and 220 which are formed of a foaming resin, and serially disposed in the housing 100, and has a hollow portion in which raw water is filtered and introduced, and has at least two or more insertion holes 211 and 221 which are radially arranged;

an upper supporting plate 230 which supports an upper side of the uppermost filter 210 and is communicated with the filtered water outlet port 120;

a compressing plate 240 which supports a lower side of the lowermost filter 220 and is formed with a coupling hole 241 corresponding to the insertion hole 211, 221;

a supporting rod 250 of which one end is fixed to the upper supporting plate 230 and the other end is fixed to an lower end of the housing 100, and which is inserted into the insertion hole of the filters 210 and 220 and also the coupling hole 241 of the compressing plate 240; and

a compressing means 300 which applies the compressing force to the filter 210, 220 by lifting up the compressing plate 240 so that a pore size of the filter 210, 220 is reduced upon filtering of the raw water, and releases the compressing force by lifting down the compressing plate 240 so that the pore size of the filter 210, 220 is increased upon back-washing.
The filtration device according to claim 1, wherein the supporting rod 250 is formed with a plurality of holes 251 and also provided with a compressed air supplying means for supplying compressed air to the supporting rod 250 and assisting restoration of the filter 210, 220 by the compressed air discharged through the hole 251 when the compressing plate 240 is lifted down by the compressing means 300.
The filtration device according to claim 1, wherein the housing 100 further comprises a back-washing inlet port 130 which is formed at the upper side of the upper supporting plate 230 so as to be communicated with the upper supporting plate 230.
The filtration device according to claim 1 or 2, further comprising a filter supporting plate 260 which is disposed at an upper side of the uppermost filter 210 and a lower side of the lowermost filter 220 and between the filters 210 and 220 so as to disperse the compressing force applied to the filter 210, 220 and also communicate the filters 210 and 220 with each other.
The filtration device according to claim 1 or 2, wherein the housing 100 is provided with an observing window 140 for observing an internal portion of the housing 100.