KR102376914B1 - Filtering Apparatus for inlet water - Google Patents

Abstract

The present invention relates to a filtration device. According to the filtration device of the present invention, by allowing water to flow into a closed space formed by a bottom surface of a water tank, a vertical wall surface, an inclined filter body (20) and a side filter body (30), the water passes through the filter bodies (20), (30) to be stored in the water storage tank. In particular, the filter body (20) is configured to have a gradient which gets close to a bottom surface of the water storage tank as the filter body moves away from a water inlet pipe (5) flowing into the water storage tank. When the water pressure inside the closed space rises, the filter body is automatically opened. Thus, larvae or foreign substances mixed with the water discharged to a water tank inlet are filtered out from flowing into the water tank. Also, the replacement of the filter body (20) is easy, and clogging of the filter body (20) due to the adhesion of foreign substances can be minimized. By installing the filtration device according to the present invention in the water tank, it is possible to filter out larvae or foreign substances from purified water flowing into the water tank, and thus, clean and reliable tap water can be supplied to the home.

Description

Reservoir filtration device equipped with safety means {Filtering Apparatus for inlet water}

The present invention is a filter body that filters larvae, eggs of larvae, foreign substances, etc. from the water flowing into a water tank in which purified water that has undergone standard water purification treatment or advanced water purification treatment of coagulation, sedimentation, filtration and disinfection processes is temporarily stored. It relates to a water tank filtration device having a.

In general, water from water sources or dams is purified (standard water treatment of coagulation, sedimentation, filtration, and disinfection, or clean water that has undergone advanced water purification treatment that adds ozone oxidation and activated carbon adsorption treatment), This is being supplied.

In the process of supplying such tap water to each home through the water purification and drainage basin, foreign substances such as scale existing in the pipe fall out from the pipe due to a sudden change in the water flow direction and flow rate in the pipe and reach the water tank, causing red water, or In some cases, it is even supplied to each household. In addition, due to the inflow of various flying insects from the water tank installed in the path where purified water is supplied to each household, the eggs of larvae that have not been killed despite chlorine disinfection, live larvae, or carcasses of dead larvae are supplied to the home. There were cases where it became a social issue.

In order to remove foreign substances such as scale detached from the inner wall of the pipe, a strainer made of a perforated network is installed and used. can

However, the prior art 1 has a problem in that the work is cumbersome and the work is not done quickly because the bolt-coupled coupler 27 must be separated from the body in order to exchange or wash the strainer. That is, in a small valve, it is not difficult to separate the coupling part, but in a large valve, the operation is delayed due to the weight of the coupling part, etc.

As another prior art, by disposing a filter body on the disk of the valve provided in the conduit of the water supply pipe to facilitate detachment only by opening and closing the valve, foreign substances or larvae that may exist in tap water or water purification process A filter drain valve that filters water and allows it to be exchanged or washed quickly and easily has been disclosed in Korean Patent Registration No. 10-2226300 (registration date of March 4, 2021) (hereinafter referred to as 'prior art 2').

However, since the filter body of Prior Art 2 is limited within the area range by the diameter of the pipe, it is not possible to secure a sufficient filtration area, and when the pores of the filter body are reduced due to the attachment of foreign substances, the flow rate is reduced, and furthermore, The water pressure due to the flow rate increases, which may cause damage to the filter body or pipe joint or cause water leakage.

In order to solve this problem, patent application No. 10-2021-0123123 (hereinafter referred to as 'prior art 3') developed by the inventor of the present invention on September 15, 2021 is A filtration device that is fixed to the vertical wall and bottom of the water tank while accepting it has been proposed. The water storage tank filtration device according to Prior Art 3 is characterized in that the inclined filter body is provided on the surface facing the water inlet pipe of the water tank. It is configured so that foreign substances adhering to the surface of the filter body 20 are washed away by the flow of the inflowing constant water and collected by the collecting unit 40 installed in the front, so that foreign substances are not absorbed into the filter body without disturbing the flow of the inflowing constant. The adhesion is minimized to prevent a decrease in the porosity of the filter body.

However, in order to filter out larvae eggs of about 0.15 mm, a filter body is formed with a filtration network having a mesh size of 100 micrometers (100 μm). If the filtration net is clogged, the amount of water passing through the filtration device is smaller than the inflow amount, so the water pressure inside the filtration device rises, which may eventually lead to damage to the filter body or damage to the filtration device. there is.

Therefore, there is a need for a method for preventing damage to the filtering device due to a decrease in the amount of water passing through the filtering device compared to the inflowing amount (水量).

Furthermore, a method for notifying the manager that the water pressure inside the filtering device has increased (that is, the time to replace the filter mesh of the filter body has arrived) is also required.

KR 20-0383870 Y1 KR 10-2226300 B1

An object of the present invention is to propose a filtration device that surrounds an inlet of constant water in a water storage tank installed in a reservoir or a water reservoir and is fixedly installed on the wall and bottom surfaces of the water tank, so that the filter body can be easily replaced.

In addition, the filtering device according to the present invention aims to minimize the adhesion of foreign substances to the filter body, thereby minimizing the decrease in the porosity of the filter body.

Furthermore, the filtration device according to the present invention aims to minimize the influence on the flow rate or hydraulic pressure of the water supply passage connected to the water storage tank.

In addition, the filtration device according to the present invention prevents damage to the filter body or damage to the filtration device that may occur when the amount of water passing through the filtering device is less than the inflow amount due to clogging of the filtering network. The purpose is to prevent it in advance.

And, the purpose of the filtering device according to the present invention is to notify the manager that the water pressure inside the filter has increased (that is, the time to replace the filter net of the filter body has arrived).

The filtering device according to the present invention,

A wall frame 11 and a floor frame 13 that are respectively closely fixed to the vertical wall and floor of the water tank, one end coupled to the wall frame, and the other end inclined toward the inner floor of the water tank. a frame comprising (15a, 15b);

a plurality of inclined filter bodies 20 detachably coupled to a surface formed by the pair of inclined frames;

a side filter body 30 detachably coupled to a surface formed by the wall frame 11, the floor frame 13 and the inclined frame 15;

The constant water flows into the closed space formed by the bottom surface of the water storage tank, the vertical wall surface, the inclined filter body 20 and the side filter body 30, and passes through the filter bodies 20 and 30. to be stored in the water tank,

The inclined filter body 20 has an inclined direction closer to the bottom surface of the water storage tank as it goes away from the constant water inlet pipe 5 flowing into the water storage tank,

The filter bodies 20 and 30 are each provided with detachable means for detachable from the frame, and any one detachable means of the detachable means maintains a locked state by the elastic force of a spring, and the lung It is characterized in that it includes a safety means for releasing the lock state while the spring is deformed by the water pressure inside the space.

Furthermore, the water storage tank filtering device according to the present invention is configured to float when the filter body is opened due to the increase in water pressure inside the filtering device by further comprising a buoyancy body 60 therein, and the filtration installed in the water storage tank to the administrator It is characterized in that the emergency (non-常) state of the device is recognized.

Another problem to be solved in the present invention and its specific solution will be described in more detail in the 'Specific Contents for Carrying Out the Invention' and accompanying drawings to be described later.

The filtering device according to the present invention is installed inside a water tank installed in a reservoir or a drain, and filters out larvae or foreign substances that are mixed with the water discharged through the water tank inlet to prevent them from flowing into the water tank.

In addition, since the filter device according to the present invention is easy to replace the filter body 20, in accordance with the water storage tank management regulations that require internal cleaning every 4 months, in parallel with the water storage tank cleaning operation, the filter network of the filter body 20 ( 25) Replacement can be performed easily.

Furthermore, since the filtration device according to the present invention surrounds the water inlet pipe and is fixedly installed on the wall and bottom surfaces of the water storage tank, unlike the filtering device installed in the water inlet pipe, the void of the filter body is reduced by the attachment of foreign substances. Even if it is, there are no problems such as damage to the water inlet pipe or a decrease in the inflow flow rate.

In particular, since the filter body 20 of the filtration device according to the present invention is installed obliquely along the inflow direction of the water, foreign substances adhering to the surface of the filter body 20 are washed away by the flow of the water and the collection installed in the front. By being configured to be collected in the portion 40, there is an effect of preventing a decrease in the porosity of the filter body by minimizing the adhesion of foreign substances to the filter body without interfering with the flow of the flowing water.

Furthermore, when the filter network is clogged to such a degree that water cannot pass through, the filter body is automatically opened by the constant pressure filled inside the filter device, thereby preventing damage to the filter device and preventing the filter mesh from being clogged. It has the effect of making the manager aware that it needs to be replaced.

Another effect of the present invention will be described in more detail in the 'Specific details for carrying out the invention' to be described later.

1 is a perspective view schematically showing the external appearance of a filtering device according to a preferred embodiment of the present invention;
2 is a perspective view showing a state in which the second inclined filter body 20 is opened.
3 is a perspective view showing a state in which the inclined filter bodies 20 are all opened.
4 is a vertical cross-sectional view of the filtering device installed in the water storage tank;
5 is an explanatory view for explaining the structure and coupling relationship of the collecting unit 40 according to a preferred embodiment of the present invention.
6 is a perspective view schematically illustrating the external appearance of a filtering device according to a second embodiment of the present invention;
7 is an explanatory view for explaining the structure and coupling relationship of the collecting unit 40 according to the second embodiment of the present invention.
8 is an explanatory view showing the configuration and coupling relationship of the safety means as a preferred embodiment of the present invention;
9 is a vertical cross-sectional view illustrating the configuration of the buoyancy body 60 and its working relationship.

Since the present invention can have various changes and can have various forms, implementation examples (態樣, aspects) (or embodiments) will be described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

In each drawing, the same reference sign, particularly the number of the tens and one digit, or the reference numerals having the same tens, one, and alphabet, indicates a member having the same or similar function, and, unless otherwise specified, each The member indicated by the reference sign may be regarded as a member conforming to these standards.

In addition, in each drawing, components are expressed in exaggeratedly large (or thick), small (or thin) or simplified in size or thickness in consideration of convenience of understanding, but the protection scope of the present invention is limited by this. it shouldn't be

The terminology used herein is only used to describe a specific embodiment (aspect, aspect, aspect) (or embodiment), and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise.

In the present application, terms such as comprises or consists of are intended to designate the existence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It is to be understood that it does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Described in this specification, 1st~, 2nd~, etc. are only referred to to distinguish that they are different components, do not mean an order, and the names may not match in the detailed description and claims of the invention can

For convenience in explaining the filtering device according to the present invention, if an approximate direction standard that is not strict is specified with reference to FIGS. 1 and 2, the direction in which gravity acts is the lower side and the opposite direction is the upper side, The direction is collectively defined as the vertical direction. And in the drawing, the longitudinal direction of the bottom frames 13a and 13b is determined in the front-back direction, and the direction from the wall surface of the water tank toward the inner center is defined as the front. And a direction orthogonal to the front-back direction is defined as a left-right direction or a horizontal direction.

In the detailed description and claims of the invention related to other drawings, unless otherwise specified, directions are specified and described according to this standard.

Hereinafter, a filtration device for a water storage tank according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

A filtration device for a water storage tank according to the present invention,

To filter out larvae or foreign substances from the water flowing into the water tank where purified water that has undergone standard water treatment or advanced water treatment in the process of coagulation, sedimentation, filtration, and disinfection is temporarily stored,

It surrounds the inlet pipe 5 of the water flowing into the water tank and has a frame that is fixedly installed on the wall surface and the bottom surface of the water tank.

The frame is

A pair of left and right vertical frames (11a, 11b) fixed to the vertical wall surface of the water storage tank by coupling means such as anchor bolts;

A pair of left and right bottom frames (13a, 13b) fixed to the bottom surface of the water storage tank by coupling means such as anchor bolts, and having one end fixedly coupled to the pair of vertical frames, respectively;

One end is fixedly coupled to the upper portion of the vertical frame, and the other end is composed of a pair of inclined frames 15a and 15b which are inclined toward the inner bottom surface of the water tank.

In addition, one or more inclined filter bodies 20 are detachably coupled to the surface formed by the pair of inclined frames 15a and 15b, that is, to the inclined surface.

In addition, the left side filter body (30a) detachably coupled to the side formed by the left vertical frame (11a) and the left bottom frame (13a), that is, the left side; and a right filter body 30b detachably coupled to a surface formed by the right vertical frame 11b and the right bottom frame 13b. Hereinafter, the left filter body 30a and the right filter body 30b are collectively referred to as a 'side filter body 30'.

That is, the filtration device according to the present invention is configured to form a closed space by the bottom surface and the vertical wall surface of the water storage tank, the inclined filter body 20 and the side filter body 30, and a water inlet pipe in the closed space (5) is installed in the water tank to be located.

The filtration device installed in this way is configured such that the constant water flowing in through the inlet pipe 5 flows out only through the filter bodies 20 (30a, 30b) inside the closed space, so that the filter bodies 20, The constant passing through 30a and 30b) is stored, and foreign substances do not pass through the filter body and remain inside the closed space.

The inclined filter body 20 can also be configured as one large inclined filter body 20 on the inclined surface formed by the pair of inclined frames 15a and 15b, but for convenience of detachment and filter net replacement work. In order to improve the , it is preferable to configure a gradient filter body divided into a plurality of pieces.

As a preferred embodiment of the present invention, as shown in FIGS. 1 to 3, in order to divide the inclined surface formed by the pair of inclined frames 15a and 15b into three zones, the inclined frame 15a, A plurality of horizontal frames 209 spaced apart at regular intervals along the longitudinal direction of 15b) are respectively coupled and fixed to the inclined frames.

When a plurality of inclined surfaces partitioned by the pair of inclined frames 15a and 15b and the two adjacent horizontal frames 209 are formed, the first inclined filter body 21 and the second inclined filter body 22 corresponding thereto are formed. , the third inclined filter body 23 is detachably coupled to each other.

The inclined filter body 20 includes a filtering net 25 that passes water and does not pass foreign substances, and is in close contact with the outer surface of the filtering net 25 so that the filter network 25 is not deformed or moved due to fluid flow. It includes a wire mesh 203 that is used and a support frame 201 for supporting the edge of the wire mesh 203 . The support frame 201 is fixed by the pair of inclined frames 15a and 15b and two adjacent horizontal frames 209 .

The filtering net 25 is configured to have a size corresponding to the shape of the support frame 201 . The filter network 25 is sufficient if it is enough to apply a nonwoven fabric for a filter to the extent of filtering out scale and larvae carcasses detached from the inner wall of the pipe, but various types of filtration sheets may be applied as needed. As shown in FIG. 2 , if the core 26 is inserted into the edge of the filter net 25 to form a square plate shape with a tight plane, the filter net replacement operation can be facilitated.

In addition, it is preferable to further include a support rod 207 for supporting the inner surface of the filtering net 25 in order to prevent the filtering net 25 from sagging into the closed space. The support rod 207 is preferably coupled to the horizontal frame 209 parallel to the inclined frame 15 so as not to cause resistance to the fluid flow.

In addition, it is preferable to further include a detachable means for detachably coupling the inclined filter bodies 21 , 22 , and 23 to the frame. As the detachment means, a structure in which the support frame 201 of the inclined filter body is coupled to the inclined frame 15 or can be easily separated is sufficient, and thus various forms may be applied. In an embodiment of the present invention, the detachment means is formed of a hinge 291 provided on one edge of the support frame 201 and a fastening bolt provided on the opposite edge of the support frame and coupled to the pin fastening hole 29 . There may be, those skilled in the art can modify the detachment means in various forms.

The filtration device of the present invention having such a configuration can easily perform the replacement of the filtration network 25 of the filter body 20 .

Although it is possible to configure the entire left side and the right side of the filtering device according to the present invention as a side filter body, since the left side and the right side are made of a right-angled triangular shape, compatibility with the above-described inclined filter body configuration can be ensured. There may be unavoidable drawbacks. Accordingly, in a preferred embodiment of the present invention, a filter body having the same size as that of the inclined filter body is installed on both left and right sides of the filtration device to configure the left filter body 30a and the right filter body 30b, and the left side filter body 30a and the right filter body 30b are respectively installed. By installing the blocking plates 17 on both sides of the left and right sides except for the filter body 30a and the right filter body 30b, compatibility between the inclined filter body and the side filter body is ensured, and manufacturing cost is possible.

In order to sufficiently secure the flow rate through the filtering device per unit time compared to the inflow flow rate of constant per unit time without considering the compatibility of the side filter body and the inclined filter body, as shown in FIG. It is also possible For the convenience of replacement, the side filter bodies shown in FIG. 6 are preferably divided into a plurality of filter bodies.

The side filter body 30 is substantially the same as the configuration of the inclined filter body 20, except that it is installed on both left and right sides of the filtering device. The configuration of the support rod and detachment means constituting the inclined filter body is also applied to the left filter body 30a and the right filter body 30b as it is.

In a preferred embodiment of the present invention, the inclined direction of the inclined filter body 20 is, as shown in FIG. 4, the farther away from the constant inlet pipe 5 flowing into the water tank, the closer to the bottom surface of the water tank. It is characterized in that it has an approaching slope.

The constant flowing in through the inlet pipe obliquely bumps into the inclined filter body while some constant passes through the inclined filter body, and the flow rate and foreign substances that do not pass through the inclined filter body follow the inclined inner surface of the inclined filter body. will move forward.

That is, the surface of the inclined filter body according to the present invention is disposed to form a gentle inclination angle rather than being disposed at right angles to the flow direction of the fluid, thereby reducing the fluid pressure applied to the filter body, thereby reducing the possibility of foreign substances passing through the filter body It can be reduced, and the clogging phenomenon in which foreign substances are caught in the pore gap of the filter body can be minimized.

Furthermore, the present invention is characterized in that the collecting unit 40 having the collecting net 44 is closely coupled to the front end of the pair of inclined frames 15a and 15b and the front end of the pair of floor frames. do.

A portion of the constant flowing in obliquely colliding with the inclined filter body 20 passes through the inclined filter body, and the flow rate and foreign substances that do not pass through the inclined filter body flow forward along the inclined inner surface of the inclined filter body. I will do

At this time, the foreign substances that flowed forward along the inclined inner surface of the inclined filter body together with the constant are collected inside the collecting part 40 provided in the front of the inclined filter body, and only the constant water is collected in the collecting network 44 . It passes through and is stored in a water tank.

5 exemplarily shows the configuration of the collecting unit 40 according to an embodiment of the present invention. The collecting unit 40 according to the present invention is closely coupled to the front end of the pair of inclined frames 15a and 15b and the front end of the pair of floor frames, and is a detachable frame 42 having an inlet 41 . ) and a collection network 44 provided in front of the detachable frame.

An upper joint plate 421 is formed on the upper portion of the detachable frame 42 , and is coupled to the horizontal frame 209 provided at the front end of the pair of inclined frames 15a and 15b. And side joint plates 422 are formed on both sides of the detachable frame 42 , and are coupled to the side blocking plates 17 . In addition, a locking protrusion 45 is formed in the lower portion of the detachable frame 42 , and is inserted into the fastening hole 195 of the horizontal bar 129 provided at the front end of the pair of bottom frames 13a and 13b to be coupled. do.

7 is an explanatory view for explaining the structure and coupling relationship of the collecting unit 40 according to the second embodiment of the present invention. The collection unit 40 shown in FIG. 7 is a modified embodiment further provided with a collection wire mesh 47, and the collection wire mesh 47 is configured to prevent the collection network 44 from being torn by the high flow rate of the inflow constant. The mesh 44 is firmly supported from the outside.

As described above, in order to filter out larvae eggs of about 0.15 mm, it is preferable to configure the filter body with a filtering net 25 having a mesh size of 100 micrometers (100 µm). , the risk of blockage is very high. If the filter net is clogged, the amount of water passing through the filtering device is rapidly reduced compared to the inflow amount, which causes an increase in water pressure inside the filtering device, and eventually damage to the filter body or damage to the filtering device. can occur.

In order to solve this problem, the present invention, as shown in [A] and [B] of FIG. 8, is any of the detachable means for enabling the filter bodies 20 and 30 to be detachable from the frame. It is characterized in that one detachable means is configured as a safety means (50).

Here, the safety means 50 has a function of making the filter body detachable from the frame, and prevents damage or damage to the filter body or the filtering device or the filtering net due to the increase in internal water pressure of the filtering device according to the present invention. It means a component that has a function to prevent it.

[A] and [B] of Figure 8 are explanatory views showing the configuration and coupling relationship of the safety means as a preferred embodiment of the present invention, [A] of Figure 8 is an enlarged view of the safety means 50 shown in Figure 2 It is an explanatory view, and [B] of FIG. 8 is an enlarged explanatory view of the safety means 50 shown in FIG.

The safety means 50 is a component that maintains the locked state by the elastic force of the spring, and releases the locked state of the filter body while the spring is deformed by the water pressure inside the closed space. In Figure 8, the latch 51 is coupled to press the outer surface of the support frame 201 of the filter body by the force of the spring 53, and when the filter body is pushed up by the water pressure inside the filtering device, the spring is compressed while The clasp 51 rotates around the hinge pin 56 of the bracket 55, and eventually the corresponding filter body is automatically opened outside the clasp of the clasp.

The safety means 50 according to the present invention may be deformed in various forms by using the elastic force and restoring force of the spring, including the embodiment shown in FIG. 8 .

And, the safety means 50 may be applied to any one or two or more filter bodies among the filter bodies 20 and 30 .

As in the present invention, in the filtration device having a safety means, when the filter body is opened by the opening of the safety means 50, the filter network must be replaced or cleaned quickly. However, since the filtering device according to the present invention is submerged in the water of the water storage tank, it is difficult for the water storage tank manager to easily confirm this fact (the fact that the filter body is opened by the opening of the safety means 50 ).

In order to solve this problem, the filtering device according to the present invention is further characterized in that it further includes a notification means for notifying the water storage tank manager that the filter body is opened by the opening of the safety means 50 .

A preferred embodiment of the notification means is a buoyancy body 60 that floats by buoyancy. 9 is a vertical cross-sectional view illustrating the configuration of the buoyancy body 60 and its working relationship.

That is, by providing the buoyancy body 60 inside the closed space of the filtering device according to the present invention, when the safety means 50 is opened, the buoyancy body 60 is floated above the water surface by the buoyancy force. , the water storage tank manager can recognize that the inflow amount exceeds the water flow through the filtering device, close the water inlet valve, and establish follow-up measures such as cleaning the water tank and replacing the filter network.

In the present invention, when the buoyancy body 60 is employed as a notification means, the safety means 50 so that the buoyancy body 60 provided inside the filtering device can be floated without any interference. It is preferable to install on the uppermost filter body among the various filter bodies 20 and 30.

The filtration device having such a configuration can easily replace only the filtration network 25 and the collecting unit 40 of the filter body 20, so clean water from which foreign substances are removed can be supplied to each home, and can be used for a long time. Even when the filter net is clogged, it is possible to prevent damage to the filter device in advance, and also it is possible to easily recognize the filter net replacement time.

20: inclined filter body
30: side filter body
40: collection unit
50: safety means
60: buoyant body

Claims (4)

A wall frame 11 and a floor frame 13 that are respectively closely fixed to the vertical wall and floor of the water tank, one end coupled to the wall frame, and the other end inclined toward the inner floor of the water tank. a frame comprising (15a, 15b);
a plurality of inclined filter bodies 20 detachably coupled to a surface formed by the pair of inclined frames;
In the filtration apparatus of the water storage tank comprising a side filter body (30) detachably coupled to a surface formed by the wall frame (11), the floor frame (13) and the inclined frame (15),

The filtering device allows constant water to flow into the closed space formed by the bottom surface of the water storage tank, the vertical wall surface, the inclined filter body 20 and the side filter body 30, and the filter bodies 20 and 30 ) to pass through and to be stored in the water tank;

The inclined filter body 20 has an inclined direction that is closer to the bottom surface of the water tank as the distance from the water inlet pipe 5 flowing into the water tank increases,
The inclined filter body 20 includes a support frame 201 for supporting the wire mesh 203 and a filtering mesh 25 having a shape corresponding to the shape of the support frame and provided on the inner surface of the wire mesh to filter out foreign substances. and a plurality of horizontal frames 209 spaced apart at regular intervals along the longitudinal direction of the inclined frames 15a and 15b and coupled and fixed to the inclined frames, respectively;
It is coupled to the horizontal frame and is configured to include a support rod (207) for supporting the filtering network (25) inside the closed space;

The filter bodies 20 and 30 are provided with detachable means for detaching from the frame, respectively,
The detachable means provided in the inclined filter body located at the top of the plurality of inclined filter bodies 20 maintains the locking state of the corresponding filter body by the elastic force of the spring 53, and by water pressure inside the closed space A filtration device for a water tank, characterized in that it is a safety means (50) for releasing the locking state of the filter body while the spring is deformed.
delete delete The method of claim 1,
A filtration device for a water storage tank, characterized in that the buoyancy body (60) floating by buoyancy is further provided in the closed space.

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