Automatic backwash water filter

Abstract

The present invention relates to an automatic backwash water filtration device, comprising: a casing (10) formed by connecting a plurality of ribs (13) between a spaced upper flange (11) and a lower flange (12); a screen section (20) supported along the circumference of the ribs (13) and having a plurality of filtration gaps (20a) formed therein for filtering fine foreign substances in raw water; a top plate (30) coupled to the upper part of the casing (10); a bottom plate (40) coupled to the lower part of the casing (10) and having a drain hole (40a) formed in the center; and a treated water drain pipe (50) connected to the bottom of the bottom plate (40) to surround the drain hole (40a) and draining treated water from which fine foreign substances have been filtered while passing through the screen section (20). It is characterized by including a backwash part (60) that is rotatably installed in the center between the top plate (30) and the bottom plate (40) and sprays backwash fluid onto the inner surface of the screen part (20).

Description

Technology Field

[0001] The present invention relates to a filter device installed in a water purification plant or a water reservoir to filter out fine foreign substances in raw water, and more specifically, to an automatic backwash water filtration device that allows the water purification process to be stopped while backwashing the filter. Background Technology

[0002] Generally, raw water flowing in from rivers, reservoirs, dams, etc., undergoes several stages of purification at water treatment plants to be purified and then supplied to households for consumption. More than hundreds of water treatment plants are in operation throughout the country to purify raw water.

[0003] Clean raw water treated at a water purification plant is collected in water reservoirs or distribution reservoirs and supplied to households. However, while the treated water is stored in these reservoirs, small organisms, such as midges and tubifex, or fine foreign substances (hereinafter referred to as fine foreign substances) may be generated. Accordingly, filter devices are operated in water reservoirs and distribution reservoirs to remove fine foreign substances contained in the raw water before it is supplied to households.

[0004] As fine foreign substances continuously adhere to the outer surface of such filter devices during prolonged operation, the water permeability gradually deteriorates; accordingly, fine foreign substances must be separated and removed from the filter devices on a regular or irregular basis.

[0005] However, excessive maintenance costs were incurred due to the frequent repetition of the process of separating and removing fine foreign substances from the filter device. Accordingly, the applicant filed and patented a backwash filter device to reduce the process of separating and removing small organisms (refer to Patent Registration No. 10-2524114, Small Organism Backwash Filter Device).

[0006] However, the patented backwash filter device had a problem in that, as the sub-connecting pipe connected to the backwash fluid supply pipe was connected as a single body to the side of the outer support pipe that drains treated water, it was impossible to supply backwash fluid to the backwash part through the sub-connecting pipe while treated water was being drained through the outer support pipe, and conversely, it was impossible to drain treated water through the outer support pipe while backwash fluid was being supplied to the backwash part through the sub-connecting pipe, resulting in a reduced amount of purified water. The problem to be solved

[0007] The present invention was created to solve the above-mentioned problems and aims to provide an automatic backwash water filtration device that can prevent the water purification process from stopping even while separating and removing excessively attached fine foreign substances, and can reduce maintenance costs by facilitating the separation and removal of fine foreign substances. means of solving the problem

[0008] To achieve the above objectives, the automatic backwash water filtration device according to the present invention comprises: a casing (10) in which a plurality of ribs (13) are connected between a spaced upper flange (11) and a lower flange (12); a screen section (20) supported along the circumference of the ribs (13) and having a plurality of filtration gaps (20a) formed therein for filtering fine foreign substances in raw water; a top plate (30) coupled to the upper part of the casing (10); a bottom plate (40) coupled to the lower part of the casing (10) and having a drain hole (40a) formed in the center; and a treated water drain pipe (50) connected to the bottom of the bottom plate (40) to surround the drain hole (40a) and draining treated water from which fine foreign substances have been filtered while passing through the screen section (20). It is characterized by including a backwash part (60) that is rotatably installed in the center between the top plate (30) and the bottom plate (40) and sprays backwash fluid onto the inner surface of the screen part (20).

[0009] In the present invention, a backwash fluid supply pipe (70) that is fixedly coupled to the center of the top plate (30) and branches off from the treated water drain pipe (50) to supply treated water is further included.

[0010] In the present invention, the screen portion (20) comprises a plurality of first and second filtering members (21) (21') that are supported to be stacked vertically along a plurality of ribs (13) and form filtration gaps (20a) between them, and first and second joining members (22) (22') that are formed at the narrowing ends of the first and second filtering members (21) (21') and are joined to the ribs (13) while simultaneously forming filtration gaps (20a) between the first filtering member (21) and the second filtering member (21').

[0011] In the present invention, the first and second filtering (21)(21') comprises a triangular section (21a) having a triangular cross-section and having the first and second joining spacing section (22)(22') formed at a pointed end, and a square section (21b) formed on the triangular section (21a) to form a filtration gap (20a).

[0012] In the present invention, the bottom plate (40) comprises a ring-shaped plate body (41) connected to the lower flange (12) and connected to the treated water drain pipe (50) on the lower side, a plurality of spaced wings (42) supported spaced apart on the upper side of the plate body (41), a drainage bracket (43) supported spaced apart from the plurality of spaced wings (42) and having a plurality of holes (43a) formed on its surface, and a hole coupler (45) formed in the center of the drainage bracket (43) and rotatably supporting the backwash part (60).

[0013] In the present invention, the backwash part (60) is further supported to rotatably support the backwash part (60) so as not to generate metal foreign matter when the backwash part (60) rotates, and the fluid support coupler (80) comprises: a tubular block (81) fixed to the upper center of the drainage bracket (43) and having an axial groove (81a) formed on the upper side having a circular cross-section; a rotating ring (82) fitted into the lower side of the column tube (61) and fixedly coupled to be fitted into the axial groove (81a); a plurality of inner fluid slip grooves (83) formed on the outer surface of the rotating ring (82) so as to be obliquely embedded toward the rotational direction of the rotating ring (82) and forming a first fluid pressure such that the rotating ring (82) is separated from the inner surface of the axial groove (81a) when the column tube (61) rotates; and a plurality of inner fluid slip grooves (83) formed on the inner surface of the axial groove (81a) of the tubular block (81). It includes a plurality of outer fluid slip grooves (84) that form a second fluid pressure so that when the rotating ring (82) rotates, the rotating ring (82) is spaced apart from the inner surface of the shaft groove (81a). Effects of the invention

[0014] According to the present invention, by including a casing (10) installed between a top plate (30) and a bottom plate (40), a screen section (20) for filtering fine foreign substances in raw water flowing into the casing (10) by wrapping the casing (10), and a backwash part (60) that sprays backwash fluid supplied through a backwash fluid supply pipe (70) inside the casing (10) onto the inner surface of the screen section (20), fine foreign substances contained in raw water flowing into the casing (10) can be effectively filtered, and at the same time, fine foreign substances attached to the screen section (20) can be effectively removed. Accordingly, the water purification process is prevented from stopping during the separation and removal of fine foreign substances, and maintenance costs can be reduced.

[0015] In addition, as the screen section (20) is implemented with a plurality of first and second filtering (21)(21') stacked on a plurality of ribs (13) arranged in a cylindrical shape, the durability against external pressure can be increased, and as the first and second filtering (21)(21') are composed of a triangular section (21a) facing the inside of the casing (10) and a square section (21b) facing the outside of the casing (10), fine foreign substances contained in the raw water flowing into the inside of the casing (10) can be effectively filtered, and conversely, as the flow velocity increases during the process in which the treated water sprayed from the backwash part (60) moves toward the square section (21b), fine foreign substances clogging the filtration gap (20a) can be effectively separated. Brief explanation of the drawing

[0016] FIG. 1 is a perspective view of an automatic backwash water filter device according to the present invention. FIG. 2 is an exploded view of the backwash filter device of FIG. 1, FIG. 3 is a cross-sectional view for explaining the configuration by extracting the screen of FIG. 2, FIG. 4 is a cross-sectional view along line IV-IV of FIG. 1, a drawing for explaining the main configuration of the inverse part, FIG. 5 is a cross-sectional view along the VV line of FIG. 1, a drawing for explaining that the injection direction of the first and second injection nozzles is formed obliquely in the horizontal direction from the first and second vertical pipes. FIG. 6 is a drawing for explaining that a fluid support coupler is installed between the backwash part column pipe and the drainage bracket of FIG. 4. FIG. 7 is a cross-sectional view illustrating the configuration of the fluid support coupler of FIG. 6. FIG. 8 is a drawing illustrating the installation and operation of the backwash filter device of FIG. 1 in a water purification plant. Specific details for implementing the invention

[0017] Hereinafter, an automatic backwash water filtration device according to the present invention will be described in detail with reference to the attached drawings.

[0018] In the following, terms described as "upper" or "upper" may include not only those directly above in contact but also those above without contact. Terms such as "first," "second," etc., may be used to describe various components, but the components should not be limited by these terms. Terms are used solely for the purpose of distinguishing one component from another. A singular expression includes a plural expression unless the context clearly indicates otherwise. Furthermore, when a part is described as "comprising" a component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Additionally, terms such as "...part," "module," etc., as used in the specification refer to a unit that performs at least one function or operation. Furthermore, in the drawings, the size of components may be exaggerated or reduced for convenience of explanation. For example, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, and therefore the present invention is not necessarily limited to what is illustrated.

[0019] FIG. 1 is a perspective view of an automatic backwash water filter device according to the present invention, FIG. 2 is an exploded view of the backwash filter device of FIG. 1, and FIG. 3 is a cross-sectional view illustrating the configuration of the screen of FIG. 2. FIG. 4 is a cross-sectional view along line IV-IV of FIG. 1 illustrating the main configuration of the backwash part, and FIG. 5 is a cross-sectional view along line VV of FIG. 1 illustrating that the spraying direction of the first and second spray nozzles is formed obliquely in the horizontal direction from the first and second vertical pipes.

[0020] The automatic backwash water filtration device according to the present invention is installed in a water purification tank or a water distribution tank (R) to filter out small organisms such as midges and earthworms contained in raw water, as well as vinyl and plastic fragments (hereinafter referred to as fine foreign substances), and comprises: a casing (10) implemented by connecting a plurality of ribs (13) between a spaced upper flange (11) and a lower flange (12); a screen section (20) supported along the circumference of the ribs (13) and having a plurality of filtration gaps (20a) formed therein for filtering fine foreign substances in the raw water; a top plate (30) coupled to the upper part of the casing (10); and a bottom plate (40) coupled to the lower part of the casing (10) and having a drainage hole (40a) formed in the center. The device is characterized by comprising: a treated water drain pipe (50) connected to wrap around a drain hole (40a) on the bottom of a bottom plate (40) and draining treated water from which fine foreign substances have been filtered while passing through a screen section (20); a backwash part (60) rotatably installed in the center between the top plate (30) and the bottom plate (40) and spraying backwash fluid onto the inner surface of the screen section (20); a backwash fluid supply pipe (70) fixedly coupled to the center of the top plate (30) and branching from the treated water drain pipe (50) to supply treated water; and a fluid support coupler (80) that rotatably supports the backwash part (60) so that metal foreign substances are not generated when the backwash part (60) rotates.

[0021] As shown in FIG. 2, the casing (10) forms a cylindrical processing space inside by welding and fixing an upper flange (11) and a lower flange (12) to both ends of a plurality of ribs (13) arranged in a cylindrical shape. This casing (10) is implemented with a height in the range of 1,000 to 1,500 mm and a diameter in the range of 800 to 1,500 mm.

[0022] As shown in FIGS. 2 and 3, the screen section (20) is supported by being stacked vertically along a plurality of ribs (13) and includes a plurality of first and second filtering sections (21)(21') that form filtration gaps (20a) between them, and first and second joining sections (22)(22') that are formed at the narrowing ends of the first and second filtering sections (21)(21') and are joined to the ribs (13) while simultaneously forming filtration gaps (20a) between the first filtering section (21) and the second filtering section (21').

[0023] The first and second filtering layers (21)(21') are made of a corrosion-resistant stainless steel material and have a structure in which filtration gaps (20a) of 0.05 to 1.5 mm, preferably 1 mm, are formed between them and supported by ribs (13). That is, since the first and second filtering layers (21)(21') are joined to a plurality of ribs (13) to form a cylindrical screen section (20), the first and second filtering layers (21)(21') maintain their shape even under pressure applied from raw water, and as a result, the durability of the screen section (20) itself is increased.

[0024] The first and second filtering (21)(21') has a cross-section in the shape of a triangle and includes a plurality of triangular sections (21a) in which the first and second joining spacing sections (22)(22') are formed at pointed ends, and a plurality of square sections (21b) formed at each of the triangular sections (21a) to form a filtration gap (20a), wherein the triangular sections (21a) are arranged facing inward toward the casing (10) and the square sections (21b) are arranged facing outward toward the casing (10).

[0025] Accordingly, fine foreign substances contained in the raw water flowing into the casing (10) through the filtration gap (20a) are effectively filtered out by the filtration gap (20a), and the treated water passing through the filtration gap (20a) diffuses into the casing (10) by the diffusion path formed by the plurality of triangular sections (21a), thereby minimizing the occurrence of fluid resistance during the process of passing through the filtration gap. Furthermore, when the treated water is sprayed toward the triangular section (21a) in the backwash part (60) to be described later, the treated water moves toward the filtration gap (20a) and the flow velocity increases, thereby enabling backwashing that effectively separates fine foreign substances blocking the filtration gap (20a).

[0026] The top plate (30) is coupled to the upper flange (11), and an upper coupler (35) is installed on the central upper side, penetrating inwardly and outwardly. A backwash fluid supply pipe (70) is fixedly coupled to the upper coupler (35) to supply backwash fluid to the backwash part (60) to be described later.

[0027] As shown in FIG. 2, the bottom plate (40) is coupled to the lower flange (12) and includes a ring-shaped plate body (41) to which a treated water drain pipe (50) is connected at the lower side, a plurality of spaced wings (42) supported spaced apart on the upper side of the plate body (41), in this embodiment, three spaced wings (42), a drainage bracket (43) supported spaced apart from the plurality of spaced wings (42) and having a plurality of holes (43a) formed on its surface, and a hole coupler (45) formed in the center of the drainage bracket (43) to rotatably support the backwash part (60).

[0028] The bottom plate (40) implements a complex structural mechanism having an intermediary function connecting the treated water drain pipe (50) and the casing (10), a function of rotatably supporting the lower side of the backwash part (60), and a function of draining the treated water flowing into the casing (10) by the backwash part (60) into the treated water drain pipe (50).

[0029] As shown in FIG. 2, the treated water drain pipe (50) has an elbow shape such that the inlet and outlet face in a right-angle direction. In the treated water drain pipe (50), the inlet through which treated water flows is connected to a plate body (41) to surround the drain hole (40a), and the outlet through which treated water is discharged is fixed directly or indirectly to the side wall of the water purification tank or water reservoir (R). Accordingly, the treated water drain pipe (50) forms a flow path for draining treated water, from which fine foreign substances have been filtered by the screen section (20), to the outside of the water purification tank or water reservoir (R), and at the same time functions to fix the backwash filter device (100) itself to the inner wall of the water purification tank or water reservoir (R). As a result, the backwash filter device (100) can be easily installed or removed from the water purification tank or water reservoir (R) with a simple operation, thereby facilitating maintenance.

[0030] As shown in FIGS. 2 and 4, the backwash part (60) includes a column tube (61) rotatably coupled between an upper coupler (35) and a hole coupler (45) inside the casing (10), a pair of first and second horizontal tubes (62) (62') symmetrically connected to each of the upper and lower sides of the column tube (61), a first and second vertical tube (63) (63') vertically connected to each end of the pair of first and second horizontal tubes (62) (62'), and a plurality of first and second injection nozzles (64) (64') formed on the sides of the first and second vertical tubes (63) (63') to spray backwash fluid obliquely onto the inner surface of the screen part (20).

[0031] In order to backwash fine foreign substances attached to the entire outer surface of the cylindrical screen section (20), the backwash fluid sprayed from the first and second spray nozzles (64) (64') must be sprayed onto the entire inner surface of the plurality of filtering components constituting the screen section (20).

[0032] To this end, as illustrated in FIG. 5, the direction of backwash fluid injection from the first and second injection nozzles (64)(64') is formed obliquely in the range of 5 to 20° horizontally with respect to the first and second horizontal pipes (62)(62'). That is, by forming the injection direction of the first and second injection nozzles (64)(64') obliquely in the horizontal direction with respect to the first and second horizontal pipes (62)(62'), the first and second injection nozzles (64)(64') can inject backwash fluid three-dimensionally so as to impact all the fine foreign substances attached to the outer surface of the plurality of filters (21), and the injected backwash fluid also acts as a force that causes the first and second vertical pipes (63)(63') to rotate with the column pipe (61) as the axis. If the direction of the backwash fluid injection of the first and second injection nozzles (64)(64') is 5° or less relative to the first and second horizontal pipes (62)(62'), it does not provide sufficient force to rotate the backwash part (60), and if it is 20° or more, the backwash fluid is injected obliquely into the screen part (20), so it does not provide sufficient impact to separate fine foreign substances attached to the screen part (20).

[0033] The backwash fluid supply pipe (70) is fixed to the center of the top plate (30) branching from the treated water drain pipe (50), thereby supplying backwash fluid to the backwash part (60) even while the treated water is being drained from the treated water drain pipe (50). Accordingly, the backwash part (60) can spray backwash fluid to backwash the screen part (20) even while the treated water is being treated through the treated water drain pipe (50), and as a result, the water purification process is prevented from stopping during the separation and removal of fine foreign substances, thereby reducing maintenance costs. This is made possible by the backwash fluid supply pipe (50), which supplies the backwash part to the backwash part (60), branching from the treated water drain pipe (50).

[0034] FIG. 6 is a drawing for explaining that a fluid support coupler is installed between the backwash part column pipe and the drain bracket of FIG. 4, and FIG. 7 is a cross-sectional view for explaining the configuration of the fluid support coupler of FIG. 6.

[0035] In the present invention, the size of the casing (10) has a height of 1,000 to 1,500 mm and a diameter of 800 to 1,500 mm, and the size of the backwash part (60) that performs cleaning in the casing (10) also increases proportionally. Accordingly, the column tube (61) which serves as the rotation axis of the backwash part (60) has an outer surface with a large diameter of at least 50 to 80 mm so that it can supply a sufficient amount of backwash fluid and simultaneously support the backwash part (60) rotatably.

[0036] Meanwhile, when a column tube (61) having a large-diameter outer surface is inserted into a hole coupler (45) formed in the center of a drainage bracket (43) and rotated, a grinding action may occur between the inner surface of the hole coupler (45) and the outer surface of the column tube (61) due to friction with the inner surface of the hole coupler (45). In this case, metal foreign matter may be generated in the part where the grinding action occurs, which may degrade the water quality, and maintenance must be performed periodically or irregularly, such as replacing the part where grinding occurred over time.

[0037] In order to prevent the generation of metal foreign substances due to such grinding action, the present invention employs a fluid support coupler (80) that prevents friction from occurring between a large-diameter column tube (61) and a hole coupler (45).

[0038] As shown in FIG. 7, the fluid support coupler (80) includes a tubular block (81) that is fixed to the upper center of the drainage bracket (43) and has a circular cross-section formed on the upper side, a rotating ring (82) that is fitted into the lower side of the column tube (61) and fixedly coupled to the shaft groove (81a), a plurality of inner fluid slip grooves (83) formed on the outer surface of the rotating ring (82) so as to be obliquely embedded in the direction of rotation of the rotating ring (82) and forming a first fluid pressure such that the rotating ring (82) is separated from the inner surface of the shaft groove (81a) when the column tube (61) rotates, and a plurality of outer fluid slip grooves (84) formed on the inner surface of the shaft groove (81a) of the tubular block (81) and forming a second fluid pressure such that the rotating ring (82) is separated from the inner surface of the shaft groove (81a) when the rotating ring (82) rotates.

[0039] The inner fluid slip groove (83) includes a first inner inclined groove (83a) formed obliquely on the outer circumference of the rotating ring (82), and a second inner inclined groove (83b) formed obliquely at an angle greater than that of the first inner inclined groove (83a). More specifically, the first angle (θ1) of the first inner inclined groove (83a) is 45° relative to the normal (V), and the second angle (θ2) of the second inner inclined groove (83b) is 60° relative to the normal (V). Accordingly, when the rotating ring (82) is rotated, the treated water flowing in along the second inner inclined groove (83a) at the relatively gentle second angle (θ2) forms a first vortex that rotates outward along the first inner inclined groove (83a) at the relatively first angle (θ1). A first fluid pressure is formed by this vortex to separate the rotating ring (82) from the inner surface of the shaft groove (81a).

[0040] The outer fluid slip groove (84) has a trapezoidal cross-sectional shape that widens toward the rotating ring (82). Accordingly, when the rotating ring (82) rotates, the treated water, in which a first vortex is formed by the first inner inclined groove (83a), flows into the outer fluid slip groove (84) and is discharged. At this time, since the outer fluid slip groove (84) has a trapezoidal shape that narrows inward, the fluid forms a second vortex different from the first vortex as it passes through the outer fluid slip groove (84). Therefore, because the first and second vortices exist in a mixture between the shaft groove (81a) and the rotating ring (82), a strong second fluid pressure is formed that causes the rotating ring (82) to separate from the inner surface of the shaft groove (81a) so that the column tube (61) rotates at a relatively low speed.

[0041] Due to this structure, when the column tube (61) and the rotating ring (82) are rotated in one direction by the rotation of the backwash part (60), the treatment water between the pipe block (81) and the rotating ring (82) forms a first fluid pressure that separates the rotating ring (82) from the inner surface of the shaft groove (81a) by means of a plurality of inner fluid slip grooves (83), and forms a second fluid pressure that separates the rotating ring (82) from the inner surface of the shaft groove (81a) by means of a plurality of outer fluid slip grooves (84), and accordingly, the rotating ring (82) can maintain a separated state from the inner surface of the shaft groove (81a) even while the column tube (61) is rotated at high speed or low speed. That is, the treated water acts as a lubricant between the shaft groove (81a) and the rotating ring (82), preventing grinding action caused by friction, and even if the backwash part (60) is rotated for a long time, the generation of metal foreign matter can be prevented by the backwash action, thereby preventing the deterioration of water quality.

[0042] FIG. 8 is a diagram illustrating the installation and operation of the backwash filter device of FIG. 1 in a water purification plant.

[0043] The automatic backwash water filtration device (100) of the present invention is installed to be submerged in raw water (W) by connecting a treated water drain pipe (50) that penetrates the inner wall of a water purification tank or a water reservoir (R) where raw water is stored, and a backwash fluid supply pipe (70) is branched from the treated water drain pipe (50) and connected to an upper coupler (35) of a top plate (30), and a pressure pump (P) is installed in the backwash fluid supply pipe (70).

[0044] Due to this structure, the raw water from the water purification tank or the water reservoir (R) is normally transported to a required location through the treated water drainage pipe (50) after passing through the backwash filter device (100) of the present invention, and in this process, fine foreign substances parasitic in the raw water are filtered out by the screen section (20).

[0045] Meanwhile, when the backwash filter device (100) is operated for a long period and fine foreign matter is attached to the outer surface of the screen section (20) and the filtration efficiency gradually decreases, the fluid pump (P) is activated to pump the fluid to the upper coupler (35) through the backwash fluid supply pipe (70) branched from the treated water drain pipe (50). Then, the treated water flows into the column pipe (61), branches into the first and second horizontal pipes (62) (62'), and then passes through the first and second vertical pipes (63) (63') and is sprayed obliquely through a plurality of first and second spray nozzles (64) (64'). The backwash fluid sprayed from the first and second spray nozzles (64) (64') is sprayed over the entire inner surface of the screen section (20) while rotating the backwash part (60), thereby allowing the fine foreign matter attached to the outer surface of the screen section (20) to be separated and removed. Since this series of processes takes place while the water purification operation is in progress, it is possible to fundamentally prevent the water purification process from stopping while removing fine impurities.

[0046] Thus, according to the present invention, by including a casing (10) installed between a top plate (30) and a bottom plate (40), a screen part (20) for filtering fine foreign substances in raw water flowing into the casing (10) by wrapping the casing (10), and a backwash part (60) that sprays backwash fluid supplied through a backwash fluid supply pipe (70) inside the casing (10) onto the inner surface of the screen part (20), fine foreign substances contained in raw water flowing into the casing (10) can be effectively filtered, and at the same time, fine foreign substances attached to the screen part (20) can be effectively removed. Accordingly, the water purification process is prevented from stopping during the separation and removal of fine foreign substances, and maintenance costs can be reduced.

[0047] In addition, as the screen section (20) is implemented with a plurality of first and second filtering (21)(21') stacked on a plurality of ribs (13) arranged in a cylindrical shape, the durability against external pressure can be increased, and as the first and second filtering (21)(21') are composed of a triangular section (21a) facing the inside of the casing (10) and a square section (21b) facing the outside of the casing (10), fine foreign substances contained in the raw water flowing into the inside of the casing (10) can be effectively filtered, and conversely, as the flow velocity increases during the process in which the treated water sprayed from the backwash part (60) moves toward the square section (21b), fine foreign substances blocking the filtration gap (20a) can be effectively separated.

[0048] The present invention has been described with reference to one embodiment illustrated in the drawings, but this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom. Explanation of the symbols

[0049] R ... water purification or reservoir 10 ... casing 11 ... top flange 12 ... bottom flange 13 ... rib 20 ... screen 20a ... filtration gap 21, 21' ... 1st, 2nd filtering 21a ... triangular section 21b ... square section 22, 22' ... 1st, 2nd joint spacing section 30 ... top plate 35 ... upper coupler 40 ... bottom plate 40a ... drain hole 41 ... plate body 42 ... spacing wing 43 ... drain bracket 45 ... hole coupler 50 ... treated water drain pipe 60 ... backwash part 61 ... column pipe 62, 62' ... 1st, 2nd horizontal pipe 63, 63' ... 1st, 2nd vertical pipe 64, 64' ... 1st, 2nd injection nozzle 70 ... backwash fluid supply pipe 80 ... fluid support coupler 81 ... pipe block 81a ... Shaft groove 82 ... Rotating ring 83... Inner fluid slip groove 83a ... First inner inclined groove 83b ... Second inner inclined groove 84 ... Outer fluid slip groove

Claims

Claim 1 A casing (10) implemented by connecting a plurality of ribs (13) between a spaced upper flange (11) and a lower flange (12); a screen section (20) supported along the circumference of the ribs (13) and having a plurality of filtration gaps (20a) formed to filter fine foreign substances in raw water; a top plate (30) coupled to the upper part of the casing (10); a bottom plate (40) coupled to the lower part of the casing (10) and having a drain hole (40a) formed in the center; a treated water drain pipe (50) connected to the bottom of the bottom plate (40) to surround the drain hole (40a) and draining treated water from which fine foreign substances have been filtered while passing through the screen section (20); and a backwash part (60) rotatably installed in the center between the top plate (30) and the bottom plate (40) and spraying backwash fluid onto the inner surface of the screen section (20). and a backwash fluid supply pipe (70) that is fixedly coupled to the center of the top plate (30) and branches off from the treated water drain pipe (50) to supply treated water to the backwash part (60);The screen section (20) includes a plurality of first and second filtering members (21)(21') that are supported to be stacked vertically along a plurality of ribs (13) and form filtration gaps (20a) between them, and convex first and second joining spacing members (22)(22') that are formed at the narrowing ends of the first and second filtering members (21)(21') and are joined to the ribs (13) while simultaneously forming filtration gaps (20a) between the first filtering member (21) and the second filtering member (21'). The bottom plate (40) includes a ring-shaped plate body (41) that is coupled to the lower flange (12) and to which the treated water drainage pipe (50) is connected at the lower side, a plurality of spacing wings (42) that are supported spaced apart on the upper side of the plate body (41), and on the plurality of spacing wings (42). An automatic backwash water filtration device characterized by comprising a drainage bracket (43) that is supported at a distance and has a plurality of holes (43a) formed on its surface, and a hole coupler (45) formed in the center of the drainage bracket (43) to rotatably support a backwash part (60), wherein the treated water drain pipe (50) has an elbow shape such that the inlet and outlet face perpendicular directions, the inlet through which treated water flows is connected to a plate body (41) to surround the drain hole (40a), and the outlet through which treated water is discharged is fixed directly or indirectly to the side wall of a water purification basin or a water reservoir (R), thereby performing both support and drainage functions simultaneously. Claim 2 delete Claim 3 delete Claim 4 An automatic backwash water filter device according to claim 1, wherein the first and second filtering (21)(21') comprises a triangular section (21a) having a triangular cross-section and having the first and second joining separation section (22)(22') formed at a pointed end, and a square section (21b) formed on the triangular section (21a) to form a filtration gap (20a). Claim 5 delete Claim 6 In claim 1, the fluid support coupler (80) further comprises a fluid support coupler (80) that rotatably supports the backwash part (60) so that metal foreign matter is not generated when the backwash part (60) rotates, wherein the fluid support coupler (80) comprises: a tubular block (81) that is fixed to the upper center of the drainage bracket (43) and has an axial groove (81a) formed on the upper side having a circular cross-section; a rotating ring (82) that is fitted into the lower side of the column tube (61) and fixedly coupled to be fitted into the axial groove (81a); a plurality of inner fluid slip grooves (83) formed on the outer surface of the rotating ring (82) so as to be obliquely embedded toward the rotational direction of the rotating ring (82) and forming a first fluid pressure such that the rotating ring (82) is separated from the inner surface of the axial groove (81a) when the column tube (61) rotates; and a plurality of inner fluid slip grooves (83) formed on the inner surface of the axial groove (81a) of the tubular block (81). An automatic backwash water filter device characterized by including a plurality of outer fluid slip grooves (84) that form a second fluid pressure so that when the rotating ring (82) rotates, the rotating ring (82) is separated from the inner surface of the shaft groove (81a).

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