JPH10249114A - Filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily carry out backwashing to make easy the treatment for regenerating the filtration performance of a filter medium by constituting a filtering equipment for filtering water such as bathtub water to remove hair, dirt and the like of a perforated plate having a perforated part and a filter medium consisting of fiber whose one end part is stuck to the perforated plate and whose the other part is isolated from the perforated plate. SOLUTION: When filtration action is started, bathtub water containing hair, dirt and the like flows in a filter case 11 from a first flowing water part 14a, and a filter medium 3 consisting of fiber whose one end part is stuck to a perforated plate 2 of filtration equipment 1 is bent by water pressure to cover the perforated plate 2 and the perforated part. When the bathtub water passes through the perforated part of the perforated plate 2, the hair, dirt and the like in the bathtub water are stuck to the filter medium 3 and removed. After that, when backwashing of a filter 10 is started, while washing water passing through the perforated part of the perforated plate 2 and flowing in toward the upper part of the filter case 11 streams the filter medium 3 toward the upper part of the filter 10 to oscillate it, hair, dirt, and the like stuck to the filter medium 3 are removed by the washing water to discharge them from the first flowing water part 13a together with the washing water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter for filtering water in a bathtub or a pool to remove hair, dust and the like.

[0002]

2. Description of the Related Art In recent years, water resources have been effectively used by removing hair, dirt, bacteria, dust and the like by filtering bathtub water and pool water with a filter and returning the water to the bathtub or pool. . Conventionally, as a filter for removing hair, dirt, bacteria, garbage, etc. contained in bath water or pool water in a bathtub, those using activated carbon, ceramic balls, barley stone, etc. are known. Things are disclosed. (a) Barley rice disclosed in Japanese Utility Model Application Laid-Open No. 63-149209 (hereinafter referred to as "A"), comprising powder of barley stone adhered to each other at predetermined intervals in the vertical direction in the activated stone gravel layer. A bath water circulation / filtration device in which barite stone powder layers made of a container of a water permeable material having a mesh size of 350 mesh or less in which a stone porous membrane layer and barite stone powder are sealed are alternately arranged. b. In a filtration device disclosed in Japanese Patent Application Laid-Open No. 4-322793 (hereinafter referred to as "B") having an inlet for taking in a turbid liquid and an outlet for taking out a filtered liquid. A porous membrane member is provided on the downstream side of the mouth, and a filtering material made of fine glass particles is loaded on the porous membrane member, and a filter filled with porous ceramic spheres between the porous membrane member and the outlet is provided. apparatus.

[0003] However, the above conventional filter has the following problems. In the bath tub water circulation filtration device described in Japanese Patent Publication No. A, since the maltstone porous diaphragm layer and the maltstone powder layer are tightly fixed to the opposing inner peripheral surface of the filtration device, the maltstone porous diaphragm layer and the maltstone powder layer are removed. In order to regenerate the filtration performance, it is not possible to wash the maltstone porous diaphragm layer and the maltstone powder layer, and the filtration performance and durability are lacking. In the filtration device described in Japanese Patent Application Laid-Open No. H06-27139, since a filter medium composed of fine glass particles is loaded on the porous membrane member, cold water or hot water is introduced from the outlet to attach the scale to the glass particle layer. Glass particles are discharged in the back washing step of discharging from the inlet together with dust and dirt, and the glass particles are gradually reduced and the filtration performance is reduced. In addition, since fine glass particles are used as the filtering material, a great deal of labor is required when removing and cleaning the glass particles for regeneration of the filtering performance, and the maintenance property is lacking. Further, since the ceramic sphere is filled between the porous membrane member and the outlet, the structure is complicated and the maintenance property is poor.

In order to solve the above-mentioned conventional problems, a large-diameter pipe and a small-diameter pipe are connected substantially coaxially through a step, and a bottom formed at the opening of the small-diameter pipe and a large-diameter pipe are provided. When,
A filtration case having at least one hole formed in each of the small-diameter pipe and the bottom, and a small-diameter portion connected to the lower side of the large-diameter portion, and a filter case provided around the lower end surface of the small-diameter portion. Filed a filter with a filter material container having a flange portion locked to a stepped portion of the filter material and an upper filter material holding portion covered by an opening of a small diameter portion, and filed an application. . Hereinafter, this filter will be described with reference to the drawings. FIG. 5 is a sectional view of a main part of the filter. In the figure, 30 is a filter, 31 is a filtration case of the filter 30, 31a is a large-diameter tube above the filtration case 31, 31b is a small-diameter tube connected substantially coaxially with the large-diameter tube 31a, and 31c is a large-diameter tube. A step portion continuously provided at the lower end of the pipe 31a and the upper end of the small-diameter pipe 31b, 31d is a bottom formed in an opening below the small-diameter pipe 31b, 32a is a lower flowing part formed in the bottom 31d, and 32b is a large diameter. An upper flowing water portion drilled on the side surface of the pipe 31a, 33 is a filter material container disposed in the large-diameter tube 31a, 33a is a large-diameter portion above the filter material container 33, and 33b is a large-diameter portion 33a. The small diameter part connected continuously below the
Reference numeral 33c denotes a flange portion provided on the lower end surface of the small diameter portion 33b, reference numeral 34 denotes an upper filter material holding portion covered by a lower opening of the small diameter portion 33b, and reference numeral 35 denotes a lift provided at an upper end portion of the small diameter portion 33b. The preventing portion 36 is a filter case lid detachably attached to the upper opening of the filter case 31, and the filter material holder 37 is formed on the lower surface of the filter case cover 36 so as to protrude discontinuously on the same circumference. A cylindrical fixing portion, 38 is a short electrode inserted through the filtration case lid 36, 39 is a long electrode inserted through the filtration case lid 36, 40 is an air vent valve provided on the filtration case lid 36, 41 is a small diameter portion 33b. An upper filter member made of ceramic balls and the like disposed therein, a lower filter member made of activated carbon and barley stone, and a mesh bag 43 containing the lower filter material are stored.

Hereinafter, the operation of the filter configured as described above will be described by taking as an example the case of filtering bath water. Bath water containing hair, dirt, bacteria, trash, etc. is stirred with ozone generated by an ozone generator (not shown), pressurized by a pump (not shown), and filtered from the upper flowing water portion 32b to the filtration case. 31 flows between the large-diameter pipe 31a and the filter material container 33, and further from the filter material container fixing portion 37 at the upper end of the large-diameter portion 33a of the filter material container 33.
Flows into. The bathtub water that has flowed into the filter material container 33 gradually falls due to an increase in the internal pressure of ozone contained in the bathtub water, and when the water level falls below the tip of the long electrode 39, the filter case lid 36 The disposed air vent valve 40 is opened, and the air containing ozone in the filter case 31 is discharged, and at the same time, the water level in the filter material container 33 starts to rise. Further, when the water level in the filter material container 33 is higher than the tip of the short electrode 38, the air vent valve 40 provided on the filter case lid 36 is closed, and the water level starts lowering again.
As described above, while the air vent valve 40 repeats the opening / closing operation, the bathtub water flowing into the filter material container 33 passes through the upper filter material 41 and removes hair, dust, and the like in the bathtub water by the upper filter material 41. Then, it passes through the lower filter medium 42 and is subjected to biological filtration of physiological metabolites and wastes from the human body such as dirt by the lower filter medium 42. Next, the back washing operation in the filter will be described. At the time of back washing of the filter 30, washing water flows into the small-diameter pipe 31 b of the filtration case 31 from the lower flowing water portion 32 a to wash away physiological metabolites, waste products, and the like attached to the surface of the lower filtration material 42, and further reduce the diameter. The washing water flows into the portion 33b, and the hair, dust, and the like attached to the surface of the upper filter medium 41 are washed away, and discharged from the upper running water portion 32b together with the washing water.

[0006]

However, in the filter previously filed by the present applicant, in the case of back washing in which washing water flows from below the filter to wash out hair, dust and the like attached to the filter medium. If the flow rate of the washing water flowing into the filter is too high, the filter medium provided in the filter will be discharged together with the wash water, and the filter medium will gradually decrease, causing a decrease in filtration performance. If the flow rate of the water is too low, the hair and dust adhering to the filter material cannot be sufficiently washed away, and the filter material has poor cleanability. Therefore, it is necessary to adjust the flow rate of the wash water at the time of back washing. Also, when removing and cleaning the filter media to regenerate the filtration performance, the ceramic balls of the upper filter media are easily dispersed, which takes time and effort to remove the filter media, and makes it difficult to clean the filter media. Lack of filterability, lack of reproducibility of filter performance and maintenance.

[0007] The present invention solves the above-mentioned conventional problems, and is a washing water having a high flow rate at the time of back washing for removing hair, dust and the like adhering to the filtering material. An object of the present invention is to provide a filter which can be washed, is easy to regenerate the filtration performance of a filtration material, is excellent in maintainability, and is excellent in reproducibility of filtration performance.

[0008]

In order to solve the above-mentioned conventional problems, a filter according to the present invention comprises a filtration case, a first flowing water portion formed in one of the filtration cases, and a filter case. A filter comprising: a second flowing water portion formed on the other side; and a filter provided inside the filter case, wherein the filter has a perforated plate having a large number of holes. When,
One end is fixed to the perforated plate, and the other end is provided with a filter medium made of fibers released from the perforated plate. By this configuration, the water containing hair such as bathtub water and pool water, dirt, bacteria, garbage and the like is passed from the side of the perforated plate where the other end of the filter medium made of fiber is released, so that the fiber The filter medium consisting of warps and covers the holes on the perforated plate and the perforated plate.
It has the function of removing bacteria, dust and the like. Also,
When washing the filter media by passing the washing water from the perforated plate side,
Since the washing water passing through the hole of the perforated plate becomes turbulent and the other end of the filter medium can be shaken, hair, dust, etc. attached to the filter medium can be discharged together with the wash water from the first flowing section. At the same time, since one end of the filter medium is fixed to the perforated plate, even if the flow rate of the washing water is increased, the filter medium is not discharged from the first flowing section together with the hair or dust attached to the filter medium, It has the effect of being able to wash the filter media.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A filter according to a first aspect of the present invention includes a filter case, a first flowing water portion formed in one of the filter cases, and a filter portion formed in the other of the filter cases. A second flowing water portion, and a filtering device disposed inside the filtering case, wherein the filtering device has a perforated plate having a large number of holes, and one end portion. A filter member fixed to the perforated plate and having the other end made of fibers released from the perforated plate. Thereby, water containing hair, dirt, bacteria, garbage, etc., such as bathtub water and pool water, is passed from the side of the perforated plate where the other end of the filter medium is released from the perforated plate, thereby filtering the perforated plate. It has the effect of bending the material, covering the perforated plate and the hole with the filter material, and removing hair, dirt, bacteria, dirt and the like in the water by attaching the filter material made of fiber to the filter material. In addition, by passing the washing water from the perforated plate side, the washing water becomes turbulent, and one end is fixed to the perforated plate, and the other end is shaken by filtering a filter medium made of fibers released from the perforated plate. It has the effect of removing hair, dust and the like adhering to the filter medium while flowing over the case and discharging the same from the first running water section together with the washing water. Further, since one end of the fiber of the filter medium is fixed to the perforated plate, even when the flow rate of the washing water is increased, the filter medium is not discharged from the first flowing section together with the hair, dust, etc. Has the effect of being able to wash

[0010] Here, one end of the fiber of the filter medium is bonded,
It is fixed to the perforated plate by welding, binding and the like. The pores of the perforated plate are filtered from the fiber when the water containing hair or dust such as bathtub water or pool water is passed through from the side where the other end of the filter material of the perforated plate is free to filter. The filter is formed in such a size that the filter material does not flow into the hole. In addition, stainless steel, water-resistant resin, or the like is used as the porous plate. In addition, as the filter material, a fiber that is not hydrolyzed and has a softness that does not stand under its own weight is preferably used. This allows the filter medium to bend quickly and cover the perforated plate and the hole when the bath water or pool water flows from the side of the perforated plate where the other end of the filter medium is separated from the perforated plate. Can be attached to the filter medium without escaping hair, dust and the like in the water. Also, when the washing water is passed from the perforated plate side at the time of back washing of the filter medium, the washing water flows through the holes of the perforated plate, so that the washing water becomes a turbulent flow, and the water on the perforated plate and the holes The filter material covering the filter can be quickly raised above the filter with the washing water, and the filter material can be shaken with the washing water, so that hair, dust, and the like attached to the filter material can be easily removed.

According to a second aspect of the present invention, in the filter according to the first aspect, the perforated plate is disposed in a plurality of steps inside the filtration case, and the filter medium is provided at one end. A portion is fixed to each of the perforated plates, and the other end portion is constituted by short fibers released from each of the perforated plates. This makes it possible to filter water containing hair and debris, such as bathtub water and pool water, in a multistage manner, and since the filter media is formed of short fibers, it can be used for filtering when the filter media is backwashed. The materials are unlikely to be entangled with each other, and have an effect that hair, dust, and the like adhering to the filtering material are easily removed by the washing water. In addition, when the filter is removed from the filter and the filter is washed, the filter has an effect that the filter can be easily washed.

According to a third aspect of the present invention, in the filter according to the first aspect, the size of the hole of the perforated plate and the thickness of the filtering material are set. However, each of the perforated plates arranged in a plurality of steps inside the filtration case has a different configuration. This makes it possible to remove underwater hair and dirt, such as bathtub water and pool water, by size, and to improve the filtration accuracy by changing the size of the holes in the perforated plate and the thickness of the filter media. It has the effect that it can be changed. Here, in the upper stage, a perforated plate having a large hole to which a filter medium having a large fiber thickness is fixed is arranged. When a perforated plate is provided, it is possible to remove hair, dust and the like contained in water such as bathtub water and pool water in order from the largest one.

(Embodiment 1) Hereinafter, Embodiment 1 of a filter according to the present invention will be described with reference to the drawings.
FIG. 1 is an overall perspective view of a main part of a filtration device according to the first embodiment, FIG. 2 is a cross-sectional view of the main part showing a filtering operation of the filter according to the first embodiment, and FIG. It is principal part sectional drawing which shows the back washing of the filter. In the figure, reference numeral 1 denotes the filtering device according to the first embodiment, 2 denotes a perforated plate of the filtering device 1,
2a is a large number of holes formed in the porous plate 2, 2b is a screw hole for screwing the porous plate 2 into the filtration case, 3 is one end fixed to the porous plate 2, and the other end is a porous plate 2 This is a filter material made of soft fibers released from the filter, and is fixed to the entire surface of the perforated plate 2. Reference numeral 10 denotes the filter according to the first embodiment, 11 denotes a filtration case of the filter 10, 12 denotes a filtration case lid of the filtration case 11, 13 denotes a lid fixing portion for fixing the filtration case lid 12 to the filtration case 11, and 14a denotes a filtration case. The first flowing water portion 14b formed above the side wall of the filter 11 is a filter case 11
15 is a second water flowing section formed in the bottom wall of the filter case 1.
Reference numeral 1 denotes a filter fixing portion formed on the inner peripheral wall of the filter 1.
Screw 17 screwed into the filter fixture 15 through the screw hole 2b of the perforated plate 2, 17 is a mesh bag disposed below the inside of the filtration case 11, and 18 is barley rice stored in the mesh bag 17. It is a filter material such as stone and activated carbon. In addition, instead of being screwed to the filter fixing part 15 in the filter case 11 with the screw 16, the filter 1 is fitted to the filter fixing part, or a screw part is provided on the inner peripheral wall of the filter case 11. It may be accommodated and fixed between the section and the filter fixture section. Alternatively, only the filter 1 may be provided in the filter case 11 without using the filter 18. Also,
The filter 10 may be placed horizontally instead of vertically as shown in FIGS. 2 and 3. Further, in order to increase the flow rate of the filter medium 3 of the filter 1 at the time of back washing, as shown in FIG.
The diameter of the filter 1 may be formed smaller than the diameter below.

In the filter configured as described above,
Hereinafter, the filtering operation of the bathtub water will be described with reference to FIG. When the filtration operation is started, bath water containing hair, dirt, and the like flows into the filtration case 11 from the first flowing water portion 14a, and one end of the bath water contains fibers fixed to the perforated plate 2 of the filtration device 1. As shown in FIG. 2, the filter medium 3, which is formed into the filter case 11, bends and falls down by the pressure of the bathtub water flowing into the filter case 11, and the upper surface of the porous plate 2 and the hole 2 a are covered with the filter medium 3. The hair, dirt, and the like contained in the bathtub water are deposited on the porous plate 2 when the bathtub water flowing into the filter case 11 passes through the many holes 2 a formed in the porous plate 2 of the filter 1. It adheres to the filter medium 3 made of fiber and is removed. The bathtub water from which hair, dust and the like have been removed by the filter medium 3 flows below the filter case 11 through the holes 2a formed in the perforated plate 2 of the filter 1 and is disposed below the filter case 11. Physiological metabolites and wastes from the human body are biologically filtered by a filter medium 18 such as barley stone or activated carbon stored in the reticulated bag 17, and the filtered bathtub water is discharged from the second running water section 14b. You. Next, the back washing of the filter 10 will be described with reference to FIG. When the backwashing of the filter 10 is started, the washing water flows in from the second flowing water portion 14b, and the filtering material such as barley stone and activated carbon stored in the mesh bag 17 disposed below the filtering case 11 is provided. 18
Through the perforated plate 2 to flow above the filtration case 11. The washing water flowing from the perforated plate 2 side to the upper side of the filtration case 11 through the hole 2a of the perforated plate 2 is
a, a turbulent flow through the filter medium 3 made of fibers having one end fixed to the perforated plate 2 is applied to the filter 1 as shown in FIG.
The hair, dust and the like adhering to the filter medium 3 are removed from the filter medium 3 while being shaken while flowing over the filter medium 0, and the first and the washing water are removed.
From the flowing water section 14a. Further, when actively regenerating the filtration performance of the filter 1, the screw 16 is removed to remove the filter 1.
Can be removed from the filter fixture 15 and the filter medium 3 can be washed with running water or the like.

As described above, the filter according to the first embodiment has the following functions. A filter having a perforated plate having a large number of holes and a filter material having one end fixed to the perforated plate and the other end made of fibers released from the perforated plate is disposed in a filtration case. Therefore, when bath water containing hair, dust, and the like flows in from the first flowing water portion, the filtering material made of fiber deflects to cover the perforated plate and the hole, and bath water or the like passes through the perforated plate. It has the effect of allowing hair, dirt and the like in water to adhere to the filter medium and be removed when water is applied. At the time of back washing of the filter, the washing water is introduced from the second flowing water portion, and the washing water is caused to flow from the perforated plate side of the filter tool, thereby making the washing water turbulent at the holes of the perforated plate.
It has the effect of shaking the filter medium made of fibers having one end fixed to the perforated plate, washing away the attached hair, dirt and the like with the washing water, and discharging it from the first flowing section together with the washing water. In addition, since one end of the filter medium made of fiber is fixed to the perforated plate, even when the flow rate of the wash water at the time of back washing is increased, only the hair and dust adhering to the filter medium are washed away. Can be discharged from the first flowing water section,
It has the effect of dispersing the filter medium to prevent the filter medium from being discharged together with the wash water, and performing backwashing at a strong flow rate. The filter can be removed from the filter case for cleaning, and the filter performance can be regenerated.In addition, one end of the filter made of fiber is fixed to the perforated plate. And has the effect of being able to be washed off with running water.

(Embodiment 2) A filter according to Embodiment 2 of the present invention will be described below with reference to the drawings.
FIG. 4 is a cross-sectional view of a main part of the filter according to Embodiment 2 during backwashing. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In the drawing, reference numeral 20 denotes a filter according to the second embodiment, reference numeral 21a denotes a filter fixing portion formed above the filter fixing portion 15 on the inner peripheral wall of the filter case 11, and reference numeral 21b denotes a filter fixation on the inner peripheral wall of the filter case 11. Part 2
1a, a filter fixing portion formed above the filter 1a, 22a is a filter fixed to the filter fixing portion 15, 22b is a filter fixed to the filter fixed portion 21a, and 22c is a filter fixed portion 21c.
b, a filter plate 23a is a perforated plate of the filter device 22a having a large number of small-diameter holes, 23b is a perforated plate of a filter device 22b having a large number of holes larger than the perforated plate 23a, 23
c is a perforated plate of the filter tool 22c having a plurality of holes larger than the perforated plate 23b, and 24a is a filter medium made of thin short fibers having one end fixed to the perforated plate 23a and the other end separated from the perforated plate 23a. , 24b is a filter medium 24a having one end fixed to the perforated plate 23b and the other end separated from the perforated plate 23b.
The filter medium 24c made of thicker short fibers is a filter medium made of short fibers thicker than the filter medium 24b, one end of which is fixed to the perforated plate 23c and the other end is free from the perforated plate 23c.

As described above, the filter according to the second embodiment is configured, and in addition to the operation of the first embodiment,
It has the following effects. Since the filter tools are arranged in a plurality of stages in the filter case, the filter tools have an effect of gradually filtering hair, dust and the like contained in water such as bathtub water and pool water. In addition, since short fibers are used for the filter medium having one end fixed to the perforated plate, it is easy to remove hair, dust, etc. attached to the filter medium during back washing of the filter or washing of the filter tool, It has an effect that the filter medium is hardly entangled. As it goes to the lower side of the filter, the size of the hole of the perforated plate is smaller, and because the thin filter of the short fiber of the filter medium having one end fixed to the perforated plate is arranged with a thin filter,
It has the effect of removing hair, dust and the like in the water flowing in from the first flowing section above the filter without escaping in order from the largest one.

[0018]

As described above, according to the filter of the present invention, the following excellent effects can be realized. According to the invention as set forth in claim 1, in the filtration case, a perforated plate having a large number of holes, and a filter material having one end fixed to the perforated plate and the other end made of fibers released from the perforated plate. Is provided, the filter medium made of fiber is bent by the water pressure of bathtub water or pool water containing hair and debris flowing in from the first flowing water part, and the porous plate is bent. The top and the hole are covered, so that hair, dust and the like in the water adhere to the filter medium and can be removed, and the water in the bathtub and the pool can be filtered with a simple structure. At the time of back washing of the filter, the washing water is caused to flow from the second flowing water portion and the washing water is caused to flow from the perforated plate side of the filtering tool, so that the washing water is turbulent, and the filter medium is shaken. The hair, dust and the like attached to the filter medium can be washed away with the wash water and discharged from the first flowing section together with the wash water, and one end of the filter medium made of fibers is fixed to the perforated plate. Even when the flow rate of the water is increased, the filter medium is not discharged together with the washing water, and the backwash can be performed at a strong flow rate, and the filter has excellent backwashability. The filter can be easily removed from the filter case for cleaning, and the filter media is not dispersed and scattered when the filter is washed, and can be easily washed with running water to regenerate the filtration performance of the filter. Excellent maintainability such as. Further, according to the invention as set forth in claim 2, by further arranging the filter tools in a plurality of stages in the filter case, hair, dust, etc. contained in water such as bathtub water or pool water. It can be removed with a filter material in order from the one with the largest, and is excellent in filtration performance and excellent in filtration treatment property. By using short fibers for the filter media, it is easy to remove hair, dust, etc. attached to the filter media during back washing of the filter or when cleaning the filter device, etc. Excellent maintainability. According to the third aspect of the present invention, a filter having different sizes of holes in the perforated plate and different thicknesses of the fibers of the filter material is provided in a plurality of steps in the filter case. By setting, the filtration accuracy can be changed according to the use.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a main part of a filter according to a first embodiment.

FIG. 2 is a sectional view showing a main part of the filter according to Embodiment 1 during a filtering operation;

FIG. 3 is a sectional view of a main part showing the filter in Embodiment 1 during back washing.

FIG. 4 is a cross-sectional view of a main part showing the filter in backwash during the second embodiment.

FIG. 5 is a sectional view of a main part of the filter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filtration tool 2 Perforated plate 2a Hole 2b Screw hole 3 Filtration material 10 Filter 11 Filtration case 12 Filtration case lid 13 Lid fixing part 14a First flowing water part 14b Second flowing water part 15 Filtration fixing part 16 Screw 17 Mesh bag 18 Filtration material 20 Filter 21a Filter fixing part 21b Filter fixing part 22a Filter 22b Filter 22c Filter 23a Perforated plate 23b Porous plate 23c Porous plate 24a Filter 24b Filter 24c Filter 30 Filter 31 Filtration Case 31a Large-diameter pipe 31b Small-diameter pipe 31c Step 31d Bottom 32a Lower flowing part 32b Upper flowing part 33 Filter material container 33a Large-diameter part 33b Small-diameter part 33c Flange part 34 Upper filter material holding part 35 Lift-up prevention part 36 Filter case lid 37 Filter material container fixing part 38 Short electrode 39 Long electrode 40 Air vent opening / closing valve 1 upper filtering material 42 lower filtering material 43 net bag

Claims (3)

[Claims] 1. A filter case, a first water flow portion formed in one of the filtration cases, a second water flow portion formed in the other of the filtration cases, and a filter case. And a filter provided, wherein the filter is a perforated plate having a number of holes, one end is fixed to the perforated plate, the other end is from the perforated plate. And a filter medium made of loose fibers. 2. The perforated plate is disposed in a plurality of steps inside the filtration case, and the filter medium has one end fixed to each perforated plate and the other end separated from each perforated plate. The filter according to claim 1, wherein the filter is made of staple fibers. 3. The size of the hole of the perforated plate and the thickness of the filter medium are different for each of the perforated plates arranged in a plurality of steps inside the filtration case. The filter according to claim 1.