KR200305355Y1 - A drain cover for a drainpipe - Google Patents

Abstract

The present invention relates to a drain cover for sewage pipes, the present invention is fitted over the top of the sewage pipe, the diameter of the container becomes smaller toward the bottom, has an open top and a closed lower portion of the sewage accumulated on the bottom, A body having a plurality of drainage holes is formed along the side circumference so as to escape when the sewage that is accumulated at a bottom is more than a predetermined height, and is formed to be inclined downwardly along the lower outer circumference of the body and through the drainage hole of the body. Blades for guiding the sewage falling to the inner circumferential wall of the sewer pipe, and the upper and lower openings are inserted into the inner space of the body at predetermined intervals, the lower end is predetermined from the bottom of the body so as to be submerged in the sewage accumulated on the bottom of the body It comprises a trap forming body spaced apart from each other, and a strainer that is seated on the upper surface of the trap forming body, Degrees are simply attached to the existing sewer without construction, drainage capacity are greatly improved, preventing the odor and sewer blockage from entering the room, of course it is possible to effectively prevent the noise generated by dropping of sewage.

Description

Drain cover for a drainpipe

The present invention relates to a drain cover for sewage pipes, and in particular, it is simply installed in an existing sewer pipe without additional construction, and greatly improves drainage capacity, and prevents odors and blockage of sewage pipes that flow into the room with a very simple configuration. The present invention relates to a drain cover for a sewer pipe that is suitable for effectively preventing noise generated by falling.

In general, sewage pipes are conduits installed to exclude or treat sewage or rainwater caused by or concomitant with life or business.In the city, water pipes are compared to the blood circulation of the human body. Sewer pipes are called veins, and sewer pipes are considered important to serve as arteries not only for veins in a city, but also for cities downstream of the river basin.

In addition, the drain cover for the sewage pipe is installed in the corresponding portion of the sewer or inlet of the sewage pipe to filter out the debris mixed in the sewage to prevent the sewer pipe from being blocked or to block the odor flowing into the room through the sewer pipe. It is used as a tool to make a living, and is widely used in almost every place where daily life occurs such as sinks, baths, and apartment balconies.

In particular, in recent years, as the desire for a comfortable living environment is amplified, the importance of the drain cover for the sewage pipe is more highlighted.

1 is a reference view showing a conventional drain cover for sewer pipes.

As shown, the conventional drainage cover for sewage pipes has a cylindrical upper and lower openings as the inlet and drainage holes 109, respectively, and water sewage portions 107 are formed at the inner edges of the sewage pipes. The body 101 is fitted over the end, the strainer 105 is seated on the body 101, and the lower end to block the odor flowing into the room is locked to the water trap 107 of the body 101 The trap formation body 103 was comprised.

By such a configuration, the conventional drainage cover for sewage pipes has a predetermined size or more included in the sewage by the strainer 105 seated on the body 101 when the sewage is poured into the open inlet of the upper portion of the body 101. The sewage having it was filtered out, and then the sewage was finally drained through the drainage hole 109.

In addition, the trap forming body 103 serves to prevent the introduction of odor by blocking the flow of air flowing into the room riding the sewage pipe 200 in a state in which the lower end is immersed in the sewage is always standing in the body 101. It was.

However, since the drain cover for the sewage pipe of the related art forms a water trap 107 at the edge of the body 101 as a means for preventing odors from entering the room, and the drain hole 109 is formed at the center thereof. There was a problem that caused extreme noise.

In general, where the water collecting port or the inlet is formed in the sewer pipe 200, the pipe is formed vertically at a considerable distance, and after the sewage exits the drainage hole 109, the sewage pipe 200 has almost no resistance within a considerable distance. Noise was generated while colliding with the wall of the sewer pipe 200 at an increased speed while falling freely, and in particular, the noise spreads while vibrating along the wall of the sewer pipe 200.

On the other hand, in order to solve the noise problem as described above recently by making a spiral guideway that can induce the flow of sewage in the inner circumferential wall of the sewer pipe (200) by making the sewage down while rotating the inner circumferential wall of the sewer pipe (200) The invention of the student invention, which prevents the introduction of odors by installing a switchgear on the top of the sewage pipe 200, was awarded the President's Award at the 15th Korea Student Invention Exhibition hosted by the Korea Intellectual Property Office.

However, this invention is to solve the conventional noise and odor problem, but not only the configuration is very complicated, there is a difficult problem to open or replace the existing sewage pipe itself itself, and also need to operate the switchgear one by one There was a troublesome problem.

Therefore, the present invention has been proposed to solve the conventional problems as described above, the purpose of the present invention is simply installed in the existing sewage pipes without additional construction, the odor and clogging of the sewage pipes introduced through the sewage pipes with a simple configuration only. Of course, to provide a sewer pipe drain cover that can effectively prevent the noise caused by the fall of the sewage in the sewer pipe irrespective of the amount of sewage to be drained large and small.

In addition, another object of the present invention is to provide a drain cover for a sewer pipe that can greatly improve the drainage capacity by utilizing the centrifugal force by a simple configuration for rotating and draining the sewage.

1 is a reference diagram showing a drain cover for a conventional sewage pipe.

2 is a state of use of the present invention.

Figure 3a is an exploded perspective view of the present invention.

3b is an assembly drawing of 3a.

Figure 4a is a reference diagram showing a state in which the rotation guide groove is formed in the blade of the present invention.

Figure 4b is a reference diagram showing a state in which the rotation guide projection formed on the blade of the present invention.

Figure 5a is a reference diagram showing a drainage hole formed in the body of the present invention.

FIG. 5B is a partial cross-sectional view taken along line II ′ of FIG. 5A; FIG.

5C is a bottom perspective view of FIG. 5A.

Figure 5d is a reference diagram showing a state in which the drainage induction piece is further formed in Figure 5a.

Figure 6a is a cross-sectional view showing a state in which a large amount of sewage is drained through the drain cover for sewage pipe of the present invention.

Figure 6b is a cross-sectional view showing a state in which a small amount of sewage is drained through the drain cover for sewage pipe of the present invention.

Figure 6c is a reference diagram showing the flow of sewage drained through the drain cover for sewage pipe of the present invention.

Figure 6d is a cross-sectional view showing a state in which the sewage is accumulated in the drain cover for sewage pipes of the present invention.

* Description of the symbols for the main parts of the drawings *

1: body 3: blade

5: trap formation body 7: sieve

9: drainage hole 11a: rotation guide groove

11b: rotation guide projection 15: drainage guide

In order to achieve the above object, the drain cover for sewage pipes according to the technical idea of the present invention is inserted into the upper end of the sewage pipe, and has a container shape in which the diameter decreases toward the bottom thereof. The goey has a closed lower part, and the goey on the bottom is formed with a plurality of drainage holes formed along a side circumference along the side circumference so as to escape when the sewage is above a predetermined height, and is formed to be inclined downwardly along the lower outer circumference of the body, A blade for guiding the sewage falling through the drain hole of the body to the inner circumferential wall of the sewage pipe, and the upper and lower open tubular shape is inserted at a predetermined interval spaced inside the body, the lower end sewage is accumulated on the bottom of the body The trap forming body spaced apart from the bottom of the body by a predetermined amount so as to be locked to the upper surface of the trap forming body, Is characterized by its technical configuration that is configured to include a strainer.

Here, it is preferable that a plurality of rotation guide grooves are formed on the upper surface of the blade to guide the sewage falling through the drainage hole of the body to rotate in one direction.

In addition, the drainage hole is formed in a long hole in the up and down oblique direction, it is preferable that the inner wall of the drainage hole is formed obliquely from one side to the outside from the inside of the body so that the sewage rotates in one direction.

In addition, a drainage guide piece having a predetermined curvature may be further formed between the drainage hole on the outside of the body and the drainage hole to induce a flow of water drained through the drainage hole so as to stably rotate in one direction.

Hereinafter, with reference to the accompanying drawings an embodiment according to the technical idea of the present invention in detail as follows.

2 is a state diagram used in the present invention.

As shown, the sewer pipe drain cover 100 of the present invention is used in a state simply mounted on top of the sewer pipe 200 is sewage is collected, without having to tear or replace the existing sewer pipe 200 is installed, breakthrough Owing to the very simple configuration, the odor flowing into the room through the sewer pipe 200, the sewer pipe 200 blocked by the dirt mixed in the sewage, the drainage capacity is reduced due to the installation of the sewer pipe drain, falling sewage and other sewer pipes (200) It is possible to solve all kinds of noise problems that enter the room.

Hereinafter will be described in detail the configuration of the drain cover 100 for sewage pipe of the present invention.

3a is an exploded perspective view of the present invention, and 3b is an assembled view of 3a.

As shown, the subject innovation includes a body 1, a blade 3 extending from the body 1, a trap forming body 5, and a strainer 7, wherein the body The trap-forming body 5 is inserted and seated in (1), and is simply assembled in such a manner that the strainer 7 is seated on top of the trap-forming body 5.

Here, the body 1 has a container shape in which the upper part is opened to form an inlet and the lower part is closed, but the diameter thereof decreases downward.

In addition, a plurality of drainage holes 9 are formed along a circumference at a predetermined height of the side surface of the body 1.

As such, when the drainage hole 9 is formed, sewage is poured through the open upper portion of the body 1, and then a sump is formed on the bottom surface of the closed body 1, and when the drainage hole 9 is above a predetermined height, the drainage hole 9 is formed. It will exit to the outside of the body (1).

Here, it can be seen that the bottom of the body (1) is sewage is always standing up to a predetermined height, and this always standing sewage is introduced into the room via the sewer pipe with the trap-forming body (5) described in detail below. It will act to block odor.

In addition, a flange 21 is formed at an edge around the open inlet of the body 1 so as to be able to span the upper part of the sewer pipe, thereby enabling the body 1 having a container shape to be stably supported after being fitted into the sewer pipe. do.

Here, although the flange 21 formed in the body 1 is shown in a square shape, it may be formed in another predetermined shape so that the sewage pipe can be stably spanned and supported according to the surrounding conditions in which the sewer pipe is embedded.

In addition, the blade 3 is formed to extend inclined downward along the lower outer circumference of the body (1).

As such, when the blade 3 is formed, sewage that is dropped after being drained through the drainage hole 9 of the body 1 is guided to flow through the inner circumferential wall of the sewer pipe by the blade 3.

Here, the blade (3) is useful both in the case of a strong flow rate and a weak flow rate of the sewage discharged through the drain hole (9).

That is, when the amount of sewage is small and does not have a strong flow rate, after the sewage exits the drainage hole 9 and the direction is changed in the horizontal direction, the sewage pipe does not reach the inner circumferential wall of the sewer pipe and falls.

In addition, in the case where the amount of sewage is large and has a strong flow rate, after the sewage is diverted in the horizontal direction as it exits the drainage hole 9, although most of the sewage reaches the inner circumferential wall of the sewage pipe, some of the sewage is drained out. (9) As the speed decreases rapidly due to the frictional resistance caused by contact with the inner wall, it falls without reaching the inner circumferential wall of the sewer pipe.

In this case, when the sewage does not reach the inner circumferential wall of the sewer pipe immediately after exiting the drainage hole 9, the blade 3 receives the falling sewage, and then switches directions to guide the inner circumferential wall of the sewer pipe. do.

At this time, in order to reach the inner circumferential wall of the sewage pipe by the repulsive force while the direction of the sewage is changed to impact the upper surface of the blade 3, the speed at the moment of impinging on the blade 3 is important, the sewage falling by gravity The drainage hole 9 and the blade 3 should be formed at an appropriate distance from each other so that a sufficient speed can be formed.

In addition, the degree of inclination of the blade 3 downward is approximately 30 ° to 40 ° in the downward direction with respect to the horizontal line so that the sewage reaching the upper surface of the blade 3 can be moved farthest in the horizontal direction. It is suitable.

In addition, the distance that the lower end of the blade 3 is spaced apart from the inner circumferential wall of the sewage pipe as narrow as possible, in consideration of the maximum amount of sewage that can flow through the inner circumferential wall of the sewage pipe is determined in a range that does not interfere with the flow.

As described above, the present invention allows a large amount of sewage to fall or flows down the inner circumferential wall of the sewage pipe, so that the sewage falls freely in the sewer pipe without resistance almost as before. You can solve the problem.

In addition, the trap-forming body 5 is inserted into the tubular shape with the upper and lower portions open at predetermined intervals inside the body 1.

In addition, in the state in which the trap forming body 5 is inserted into the body 1, the lower end is formed to be spaced apart from the bottom of the body 1 by a predetermined degree so as to be immersed in the sewage accumulated on the bottom of the body 1.

Here, the trap forming body 5 has a plate 25 corresponding to the seating portion 23 formed in the flange 21 of the body 1 to be stably supported in the state inserted into the body 1 It is formed on the upper rim.

As such, when the trap forming body 5 is provided and inserted into the body 1, sewage is poured into the open inlet above the body 1 and then exits through the drainage hole 9. The U-shaped route is distributed until. That is, a path penetrating the center of the trap forming body 5, a gap path in which the lower end of the trap forming body 5 and the bottom surface of the body 1 are spaced apart from each other, and an outer side of the trap forming body 5. And a U-shaped path formed by connecting the paths formed by separating the inner side of the body 1 from each other is provided.

Here, the flow path of the sewage formed by the trap forming body 5 and the body 1 is the same as the flow path of the U-shaped trap that is usually installed on the pipe, and always The sewage that is standing up blocks the odor and noise that enters the room through the sewer pipe, like the sewage that is accumulated in the U-shaped trap.

Thus, by the exquisite combination of the body (1) and the trap forming body (5), the present invention forms a trap to prevent the introduction of odor with a simple configuration, and at the same time the drain hole (9) is formed in the center of the sewer pipe It can be avoided.

In addition, in the gap path where the lower end of the trap-forming body 5 and the bottom of the body 1 are spaced apart, the allowable gap through which the sewage flows is small and the direction is changed rapidly, so that the long and flexible dirt such as hair Very effective in removing them.

Therefore, the present invention can effectively filter the dirt contained in the sewage without relying solely on the strainer 7 to filter the dirt from the sewage, in particular, by the body 1 and the trapping body 5. The dirt can be easily removed by lifting the body (1) from the top of the sewage pipe to separate the trap-forming body (5).

In addition, the sieve (7) is a plurality of through-holes 29 are formed so that the sewage is penetrated when the sewage is poured to filter out more than a predetermined size of dirt contained in the sewage, seating formed on the upper surface of the trap forming body (5) The seat 27 fits in the seat 27.

Figure 4a is a reference diagram showing a state in which the rotation guide groove is formed in the blade of the present invention. (However, the arrows shown in Figs. 4A, 4B, 5B, 5C, 5D, 6A, 6B, and 6C indicate the flow of water.)

As shown, a plurality of rotation guide grooves (11a) is formed on the upper surface of the blade 3 of the present invention to guide the sewage falling out of the drainage hole 9 of the body 1 to rotate in one direction. desirable.

Here, the rotation guide groove (11a) is formed radially around the center, it is formed curved in accordance with the direction of the sewage to be rotated.

Thus, the sewage falling and reaching the upper surface of the blade 3 is joined to the other sewage flowing through the inner circumferential wall of the sewer pipe while rotating in one direction under the guidance of the rotation guide groove 11a.

As such, the rotation guide groove 11a formed on the upper surface of the blade 3 rotates the sewage in one direction, so that the falling sewage collides with the upper surface of the blade 3 and then instantly jumps to collide with the inner circumferential wall of the sewer pipe. When it does not collide at right angles, it minimizes the reaction force generated during the collision and at the same time prevents noise.

In addition, the rotation guide groove (11a) serves to disperse so that the falling sewage is not collected in one place on the upper surface of the blade (3).

As a result, as the sewage falling through the plurality of drainage holes 9 collects together, the speed decreases abruptly, thereby preventing the problem of not reaching the inner circumferential wall of the sewer pipe.

On the other hand, the upper surface of the blade 3 of the present invention may be formed in the rotation guide projection (11b) instead of the rotation guide groove (11a) to serve as the rotation guide groove (11a) as described above.

4b is a reference view showing a state in which a rotation guide protrusion is formed on the blade of the present invention.

As shown, the rotation guide projection (11b) of the present invention is formed radially about the center, as in the rotation guide groove (11a), is formed curved in accordance with the direction of the sewage to be rotated.

5A is a reference view showing a drainage hole formed in the body of the present invention, FIG. 5B is a partial cross-sectional view taken along line II ′ of FIG. 5A, and FIG. 5C is a bottom perspective view of FIG. 5A.

As shown, the drainage hole 9 of the present invention is formed by a long hole in the vertical direction oblique.

In addition, referring to FIG. 5B, the inner wall 13 of the drainage hole 9 is formed from the inside of the body 1 to the outside so that the sewage discharged through the drainage hole 9 may rotate in one direction. When formed at an angle to the left or right at an angle toward the direction.

Thus, by the configuration of the inner wall 13 of the drainage hole 9, the sewage is rotated in one direction while exiting the inner wall 13 of the drainage hole 9, and the rotational force generated at this time is through the present invention. It affects the entire flowing sewage and flows in a spiral while the whole sewage passes through the present invention and then drains.

When the sewage is drained while rotating in this manner, the amount and speed of the sewage drained are significantly increased.

That is, as the sewage already introduced in the pipe of the trap-forming body 5 rotates, a pressure drop occurs, and the newly introduced sewage is quickly joined by the suction force, and at the same time, when the sewage rotates, The centrifugal force to bounce outwardly in proportion to the square acts strongly, in which case the drainage hole 9 of the present invention exits through the drainage hole 9 because it is formed along the lateral circumference of the body 1. The rate and amount of sewage will increase significantly.

In addition, the sewage that is drained while rotating in one direction by the drainage hole 9 collides in an oblique direction rather than perpendicular to the inner circumferential wall of the sewer pipe, despite the increased speed by the centrifugal force. It is possible to reduce the small noise that can be caused by the reaction force and impact of the sewage.

FIG. 5D is a reference diagram illustrating a state in which a drain induction piece is further formed in FIG. 5A.

As shown, between the drainage hole 9 and the drainage hole 9 outside the body 1, a drainage induction piece 15 having a predetermined curvature to induce a flow of sewage to be drained and rotate in one direction is further included. Can be formed.

Here, the drain induction piece 15 is integrally formed in the body 1, and has a strong water flow toward the bottom of the drainage hole 9 and has a larger area from the top to the bottom in order to stably guide the flowing sewage. It is preferably formed.

As such, when the drain induction piece 15 is formed, the flow of sewage guided in one direction by the inner wall 13 of the drain hole 9 can be induced more stably.

Figure 6a is a cross-sectional view showing a state in which a large amount of sewage is drained through the drain cover for sewage pipe of the present invention, Figure 6b is a cross-sectional view showing a small amount of sewage drained through the drain cover for sewage pipe of the present invention. It is also.

Referring to Figure 6a, when a large amount of sewage is drained through the drain cover for the sewage pipe of the present invention, the sewage drained through the drain hole (9) formed in the body (1) is the inner wall of the drain hole (9) 13) since it has a high speed even after being switched to the horizontal direction, most fall directly on the inner circumferential wall of the sewage pipe 200 and then fall down the inner circumferential wall of the sewage pipe 200.

On the other hand, referring to Figure 6b, when a small amount of sewage is drained through the drain cover for the sewage pipe of the present invention, the sewage drained through the drain hole 9 formed in the body (1) is the inside of the drain hole (9) Since it is converted to the horizontal direction by the side wall 13 and has a low speed, most of it reaches the upper surface of the blade 3 while falling downward immediately after passing through the drainage hole 9.

At this time, the sewage is a predetermined speed increase by gravity while reaching the upper surface of the blade 3 from the drainage hole 9, whereby sewage pipe 200 by the repulsive force generated when the impact on the upper surface of the blade (3) You can jump to the inner wall.

As such, the present invention guides the sewage to be drained to reach the inner circumferential wall of the sewer pipe 200 regardless of whether the sewage is drained in small or large amounts so that the sewage pipe 200 flows through the inner circumferential wall of the sewer pipe 200. Free fall within the) it is possible to effectively prevent the noise generated while colliding with the wall of the sewer pipe 200 at an increased speed.

Figure 6c is a reference diagram showing the flow of sewage drained through the drain cover for sewage pipe of the present invention.

As shown, the sewage drained through the drain cover 100 for the sewage pipe of the present invention has a property to still rotate even when reaching the inner circumferential wall of the sewer pipe 200, as shown by the inner wall of the sewer pipe 200 as indicated by the arrow During the ride, it rotates in a spiral shape up to a predetermined height.

Therefore, even though the sewage is drained at a high speed through the present invention, the speed of draining has little effect on the vertical falling speed flowing through the inner circumferential wall of the sewage pipe 200, thereby preventing the occurrence of noise.

Figure 6d is a reference diagram showing a state in which the sewage is accumulated in the drain cover for sewage pipes of the present invention.

As shown, the drain cover for the sewage pipe of the present invention is sewage is constantly standing on the bottom of the body and the trap-forming body (5) forming a trap with the body (1) regardless of whether the sewage is drained As a result, the odor and noise introduced into the room are blocked by the sewer pipe 200.

The operation of the drain cover for sewage pipes according to the present invention configured as described above will be described in detail with reference to the accompanying drawings with a focus on the flow of sewage.

First, when sewage is poured from the top of the sewer pipe 200 formed with the catchment port and the inlet, the poured sewage is trapped in the state inserted into the body 1 through the through hole 29 formed in the strainer 7 of the present invention. It flows into the tube of the sieve (5).

At this time, if there is dirt of a predetermined size or more mixed in the sewage is filtered by the strainer (7).

Subsequently, the sewage flowing into the trap forming body 5 passes through the inside of the trap forming body 5 and reaches the bottom surface of the body 1.

Thereafter, the lower end of the trap-forming body 5 and the spaced apart gap of the body 1 are passed, and dirt, such as hair, included in the sewage but not filtered by the strainer 7 during this process, It will be filtered once.

Subsequently, the sewage reaches the plurality of drainage holes 9 formed in the body 1 via a passage formed by separating the trap forming body 5 and the inside of the body 1 by a predetermined interval.

At this time, if the amount of sewage is large, the flow rate is large, and thus, the vehicle rapidly exits the drainage hole 9 at a large speed while climbing up to the upper portion of the drainage hole 9.

Here, the sewage is rotated in one direction while passing along the inner wall 13 of the drainage hole 9, the rotational force is also transmitted to the sewage flowing along it so that the whole sewage passing through the present invention rotates while drawing a spiral shape. do.

As such, when the sewage flowing through the present invention is rotated, a larger amount of sewage flows out through the drainage hole 9 by centrifugal force, and at the same time, the sewage flowing through the strainer 7 is trapped. 5) It quickly enters other sewage that already enters and rotates and forms a low pressure in the center, so that a larger amount of sewage flows in quickly.

In addition, the sewage discharged at a high speed from the drainage hole 9 directly reaches the inner circumferential wall of the sewage pipe 200 without great recoil and falls without noise while drawing a spiral.

On the other hand, if the amount of sewage is small, since the flow rate is small, it does not reach the inner circumferential wall of the sewer pipe 200 and falls immediately after exiting the drainage hole 9.

The sewage that falls in this way reaches the upper surface of the blade 3 formed around the lower outer side of the body 1 and collides with the repulsive force due to the dropping speed to reach the inner circumferential wall of the sewer pipe 200. Thus, even when a small amount of sewage is drained, noise is suppressed while falling along the inner wall of the sewer pipe 200.

On the other hand, if the amount of the filtered filth does not pass through the spaced gap between the bottom of the body (1) and the lower end of the trap forming body 5 is gradually increased so that the drainage is not smooth, the body from the top of the sewer pipe (200) After lifting (1), the body 1 and the trap-forming body 5 can be disassembled to easily remove the filtered dirt.

In the above described a preferred embodiment of the present invention. The present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Therefore, the above description does not limit the scope of the present invention defined by the limits of the following utility model registration claims.

As described above, the sewage pipe drain cover according to the present invention is simply installed in the existing sewer pipe without additional construction, and prevents odor and blockage of the sewage pipe introduced through the sewer pipe, as well as a large amount of sewage drained. Regardless of the number, it is possible to effectively prevent the noise generated by the sewage falling in the sewer pipe.

In addition, the drain cover for the sewage pipe according to the present invention has the effect of greatly improving the drainage capacity by rotating the sewage and discharge the sewage simply by a simple configuration to maximize the centrifugal force generated at this time.

Claims (4)

It has a container shape that is fitted over the top of the sewage pipe and becomes smaller in diameter as it goes down, and has an open upper part and a closed lower part where a predetermined amount of sewage accumulates on the bottom side, and the side of the sewage on the bottom side exits when the sewage reaches a predetermined height. A body having a plurality of drainage holes formed along a circumference thereof; A blade extending inclined downward along a lower outer circumference of the body and guiding sewage falling through the drain hole of the body to an inner circumferential wall of the sewer pipe; A trap forming body spaced apart from the bottom of the body by a tubular shape having upper and lower openings inserted into the body at predetermined intervals, the lower end being immersed in the sewage accumulated on the bottom of the body; Sewer pipe drain cover characterized in that it comprises a strainer that is seated on the upper surface of the trap forming body. The method of claim 1, Sewage pipe drain cover characterized in that the upper surface of the blade is formed with a plurality of rotation guide grooves for guiding the sewage falling through the drain hole of the body to rotate in one direction. The method of claim 1, The drainage hole is formed of a long hole in the oblique direction up and down, the inner wall of the drainage hole drain cover for the sewer pipe, characterized in that formed in an oblique direction from the inner side to the outer side of the body so that the sewage rotates in one direction. The method of claim 3, wherein A drain cover for a sewer pipe is further formed between the drain hole and the drain hole outside the body to induce a flow of water drained through the drain hole so as to stably rotate in one direction.