JP6998829B2 - Drain filter for urine - Google Patents

Description

The present invention relates to a drainage port filter provided at the drainage port of a urinal having a trap portion formed so as to surround the circumference of the drainage pipe.

Hair, dust, etc. that flow into the drain of the urinal can be a factor that clogs the drain. Here, the clogging of the exhaust pipe can be removed by cleaning the exhaust pipe with strong chemicals, high-pressure washing, a torah, or the like. However, this method can adversely affect the urinal or equipment installed downstream of the urinal.

Here, in the floor-standing urinal and the recent wall-mounted urinal, a trap portion for suppressing the odor from the exhaust pipe is formed so as to surround the circumference of the exhaust pipe. In order to prevent clogging of the drainage pipe of a urinal having this configuration, a method of providing a filter for catching hair, dust, etc. flowing into the drainage port at the drainage port of the urinal is widely known.
In Patent Document 1, the annular sheet plate and the tubular net body are integrally formed by thermally adhering the opening end edge of the tubular net body to the annular sheet plate made of a synthetic resin having heat adhesiveness. The joined drainage filter is disclosed. Hair, dust, etc. flowing into the drainage port are captured by this tubular net body.

Japanese Patent No. 5250447

However, when the drainage port filter described in Patent Document 1 is provided in the urinal drainage port, the mesh spacing of the tubular net body is expanded due to the drainage that has flowed vigorously into the drainage port or a large amount of drainage. At this time, hair, dust, etc. that flow in together with the drainage may pass through the widened mesh and flow into the drainage pipe.

Therefore, the present invention is installed in the drainage port of a urinal having a trap portion formed so as to surround the circumference of the drainage pipe, and hair and dust flowing into the urinal drainage port together with strong drainage and a large amount of drainage. It is an object of the present invention to provide a drainage port filter for effectively preventing such things from flowing into a drainage pipe.

In order to solve the above problems, the drainage filter according to the present invention has (1) a drainage opening through which drainage of a urinal having a trap portion formed so as to surround the drainage pipe is passed, and the drainage. A drainage port filter provided at a urinal drainage port formed at the upper end of the drainage pipe, comprising a filter portion arranged so as to separate the openings, and the drainage opening is the filter portion. The filter portion is made of a resin material, and the opening area of each drainage opening cell portion does not change when the drainage collides with the filter portion. And.

(2) The drainage port filter has a flat surface extending in a plane direction perpendicular to the height direction of the drainage port filter, and the flat surface comes into contact with the edge of the urinal drainage port, so that the drainage port filter is small. The drainage port filter according to (1), which is supported by the drainage port of a urinal.

(3) The filter portion has a filter top surface portion, a filter bottom surface portion, and a filter side surface portion connecting the filter top surface portion and the filter bottom surface portion, and the flat surface is the filter in the height direction. The drainage port filter according to ( 2), which is formed on the lower surface of the top surface portion and has a depth of the bottom surface portion of the filter of a predetermined value (mm) or more.

(4) The drainage port filter according to (3), wherein the predetermined value is 10 (mm).

(5) The leg portion extending downward in the height direction is provided, the leg portion includes a protrusion extending radially outward from the leg portion, and the drainage port filter is installed in the drainage opening. The drainage port filter according to ( 2), wherein the radially outer end of the protrusion is in frictional contact with the inside of the drainage pipe provided with the urinal drainage port in the installation state.

(6) The drainage port filter according to (5), wherein the protruding portion has a slope portion connecting the radial outer end portion of the protruding portion and the lower end portion of the protruding portion.

According to the present invention, the opening area of the drainage opening cell portion does not change regardless of the amount and momentum of the drainage passing through the drainage opening. As a result, it is possible to further suppress the flow of hair, dust, etc. flowing into the urinal drainage port into the drainage pipe together with the strong drainage or a large amount of drainage.

It is a schematic perspective view of the floor-standing type urinal with the drainage port filter installed in the urinal drainage port. FIG. 3 is a schematic cross-sectional view obtained by cutting a region surrounded by a broken line A shown in FIG. 1 in a YZ plane. It is a schematic perspective view of the drainage port filter in 1st Embodiment. It is a top view of the drainage port filter shown in FIG. It is a side view of the drainage port filter shown in FIG. It is a schematic perspective view of the drainage port filter in 2nd Embodiment. It is a top view of the drainage port filter shown in FIG. It is sectional drawing of the drainage port filter shown in FIG.

Hereinafter, the drainage port filter in the present embodiment will be described with reference to the drawings. FIG. 1 is a schematic perspective view of a floor-standing urinal showing a state in which a drain filter is installed in a urinal drain. FIG. 2 is a schematic cross-sectional view obtained by cutting a region surrounded by a broken line A shown in FIG. 1 in a YZ plane. The X-axis, Y-axis, and Z-axis are three axes orthogonal to each other. The X-axis indicates the depth direction of the floor-standing urinal. The Y-axis indicates the width direction of the floor-standing urinal. The Z-axis indicates the height direction of the drainage port filter. The dot portion shown in FIG. 2 indicates a drainage port filter. The hatched portion shown in FIG. 2 shows the sealing water stored in the trap portion.
With reference to FIGS. 1 and 2, in the floor-standing urinal 10, the perforated plate 3 is arranged at a position covering the upper part of the urinal drainage port 20 formed at the upper end of the exhaust pipe 2. In order to prevent urinary stones from adhering to the drainage pipe 2, a urinary stone adhesion preventive agent 4 is placed on the perforated plate 3. In the floor-standing urinal 10, a trap portion 5 is formed so as to surround the circumference of the drain pipe 2, and a sealing water 6 is stored between the trap portion 5 and the peripheral surface of the drain pipe 2. .. The sealing water 6 can suppress the odor rising from the drain pipe 2.

In the floor-standing urinal 10, urine, washing water flowing from the floor-standing urinal 10 (hereinafter referred to as "drainage"), etc. flow into the perforated plate 3 after dissolving the urinary stone adhesion preventive agent 4. It flows into the urinal drainage port 20 through the opening (not shown) and the gap between the perforated plate 3 and the trap portion 5. A drainage filter 1 is attached to the urinal drainage port 20 in order to prevent hair, dust, and the like from flowing into the urinal drainage port 20 together with the drainage.

(First Embodiment)
FIG. 3 is a schematic perspective view of the drainage port filter according to the first embodiment. FIG. 4 is a plan view of the drainage port filter shown in FIG. FIG. 5 is a side view of the drainage port filter shown in FIG. With reference to FIGS. 3 to 5, the drainage port filter 1 includes a filter top surface portion 11, a filter side surface portion 12, and a filter bottom surface portion 13. Here, the filter side surface portion 12 and the filter bottom surface portion 13 correspond to the "filter portion" in claim 1.

The filter top surface portion 11 is formed in an annular shape in the XY plane. The filter bottom surface portion 13 includes a plurality of annular portions 130 formed concentrically, and a plurality of connecting portions 137 connecting two annular portions 130 adjacent to each other in the radial direction of the drainage port filter. The plurality of connecting portions 137 are formed at equal intervals in the circumferential direction of the drain port filter 1. The inner diameter of the filter top surface portion 11 is larger than the outer diameter of the annular portion arranged on the outermost side in the radial direction of the drainage port filter 1 among the plurality of annular portions 130. The inner peripheral surface of the filter top surface portion 11 and the outer peripheral surface of the annular portion arranged on the outermost side in the radial direction among the plurality of annular portions 130 are connected via the filter side surface portion 12. The filter side surface portion 12 has a shape that shrinks in diameter toward the lower side in the Z-axis direction.

In the present embodiment, the filter bottom surface portion 13 is formed by surrounding the first annular portion 131, the second annular portion 132 formed by surrounding the first annular portion 131, and the second annular portion 132. It is composed of three annular portions 133, a plurality of first connection portions 134, and a plurality of second connection portions 135. The first annular portion 131, the second annular portion 132, and the third annular portion 133 are arranged on the XY plane. The first annular portion 131 and the second annular portion 132 are connected by the first connecting portion 134, and the second annular portion 132 and the third annular portion 133 are connected by the second connecting portion 135. As shown in FIG. 4, the plurality of first connection portions 134 and the plurality of second connection portions 135 are each formed at equal intervals in the circumferential direction of the drainage port filter 1.

Further, in the present embodiment, the filter side surface portion 12 is composed of two fourth annular portions 120 and a plurality of third connecting portions 14. The diameter of the fourth annular portion 120 is reduced toward the lower side in the Z-axis direction, and the fourth annular portions 120 are arranged apart from each other in the Z-axis direction. The diameter of the lower end portion of the fourth annular portion 120a located above in the Z-axis direction is larger than the diameter of the upper end portion of the fourth annular portion 120b located below in the Z-axis direction.

Each of the plurality of third connection portions 14 has a substantially S-shape, and extends from the inner peripheral surface of the filter top surface portion 11 inward in the radial direction of the drainage port filter 1 from the upper bending portion 141 and the upper bending portion 141. A straight portion 142 that approaches inward in the radial direction as it extends downward in the Z-axis direction, and a straight portion 142 that extends inward in the radial direction from the lower end portion in the Z-axis direction of the straight portion 142 and connects to the outer peripheral surface of the third annular portion 133 of the filter bottom portion 13. The lower bent portion 143 is provided. That is, the filter top surface portion 11 and the filter bottom surface portion 13 are connected via a plurality of third connection portions 14. The filter side surface portion 12 is in contact with and fixed to the third connection portion 14 (straight portion 142) from the outside in the radial direction. As shown in FIG. 4, the plurality of third connecting portions 14 are formed at equal intervals in the circumferential direction of the drain port filter 1.

A drainage opening 15 is formed in the filter side surface portion 12 by being sandwiched between the filter top surface portion 11 and the filter bottom surface portion 13. The drainage opening 15 is separated by a fourth annular portion 120 in the circumferential direction of the drainage port filter 1. Further, the drainage opening 15 is separated by a plurality of third connecting portions 14 in the radial direction. As a result, the drainage opening 15 is divided into a plurality of drainage opening cell portions 15a. Here, the filtering ability of the filter side surface portion 12 depends on the spacing between the adjacent fourth annular portions 120 and the spacing at which the third connecting portion 14 is arranged in the circumferential direction of the drainage port filter 1. Further, if these intervals are excessively narrowed, it becomes difficult for drainage to flow into the drain pipe 2 due to a decrease in the water passage area, which may cause an overflow. Therefore, it is desirable to obtain an appropriate interval that can achieve both smooth drainage and filtering ability that can capture hair and the like through experiments and the like in advance.

The filter bottom surface portion 13 includes a drainage opening 136 formed inside the third annular portion 133. The drainage opening 136 is separated in the circumferential direction by a first annular portion 131, a second annular portion 132, and a third annular portion 133. Further, the drainage opening 136 is separated by a plurality of first connection portions 134 and a plurality of second connection portions 135 in the radial direction. As a result, the drainage opening 136 is divided into a plurality of drainage opening cell portions 136a. Here, the filtering ability of the filter bottom surface portion 13 includes the distance between the adjacent first annular portion 131 (second annular portion 132) and the second annular portion 132 (third annular portion 133), and the first connection portion 134 and the first connection portion 134. 2 It depends on the arrangement interval of the connection portion 135 in the circumferential direction. Further, if these intervals are excessively narrowed, it becomes difficult for drainage to flow into the drain pipe 2 due to a decrease in the water passage area, which may cause an overflow. Therefore, it is desirable to obtain an appropriate interval that can achieve both smooth drainage and filtering ability that can capture hair and the like through experiments and the like in advance.

The drainage that has flowed into the drainage port filter 1 collides with the filter side surface portion 12 and the filter bottom surface portion 13, and hair, dust, and the like that have flowed in together with the drainage are captured. After that, the drainage passes through the drainage openings 15 and 136 and is discharged to the outside of the drainage port filter 1.

The filter side surface portion 12 and the filter bottom surface portion 13 are made of a resin material having sufficient rigidity with respect to the water pressure of the drainage flowing into the drainage port filter 1. According to this structure, even if the drainage collides with the filter side surface portion 12 and the filter bottom surface portion 13, the opening areas of the drainage opening cell portions 15a and 136a do not change regardless of the flow rate and momentum of the drainage. Therefore, it is possible to further suppress the flow of hair, dust, etc. flowing into the urinal drainage port into the drainage pipe 2 together with the strong drainage or a large amount of drainage. The filter side surface portion 12 and the filter bottom surface portion 13 are made of, for example, PP (polypropylene).

The drainage port filter 1 is supported and installed on the urinal drainage port 20 by bringing the flat surface 110 formed on the back surface of the filter top surface portion 11 in the Z-axis direction into contact with the urinal drainage port 20 from above. The flat surface 110 extends in the XY plane direction. According to this installation method, the drainage port filter 1 is prevented from falling downward in the Z-axis direction. Therefore, even when the flow rate of the drainage flowing into the drainage port filter 1 is large or the momentum of the flowing drainage is strong, the drainage port filter 1 is suppressed from flowing into the drainage pipe 2.

In the installed state where the drainage port filter 1 is installed in the urinal drainage port 20, the filter bottom surface portion 13 is arranged inside the drainage pipe 2. The effects produced by this configuration are as follows.
As a method of catching hair, dust, etc. flowing into the urinal drainage port 20 together with drainage, a method of suspending a filter net at the edge of the urinal drainage port 20 and installing a filter net inside the drainage pipe 2 can be considered. However, in this method, the work of removing hair, dust, and the like from the filter net is laborious, so that the maintenance work of the filter net becomes complicated. Therefore, the present inventors have studied a method of placing a flat drainage port filter on the urinal drainage port 20 instead of the filter net.
Here, as described above, in the floor-standing urinal 10, drainage flows from the inflow opening (not shown) provided in the perforated plate 3 and the gap between the perforated plate 3 and the trap portion 5. This drainage flows into the trap portion 5 and raises the water level of the sealing water 6. When a flat drainage port filter is placed on the urinal drainage port 20, when the water level of the sealing water 6 reaches the edge of the urinal drainage port 20, the drainage port filter drains the urinals due to the buoyancy of the sealing water 6. In some cases, it floated from the mouth 20.
In order to prevent the drainage port filter from rising, it is effective to make the drainage port filter heavier. As a method of making the drainage port filter heavier, a method of increasing the width and diameter of the plurality of annular portions 130 and the plurality of connecting portions 137 can be considered. According to this method, the weight of the drainage port filter is increased, but the opening area of the drainage opening is reduced. On the other hand, in order to manufacture a drainage port filter having a desired drainage capacity, it is necessary to appropriately design the opening area of the drainage opening. Therefore, when the width or diameter of the plurality of annular portions 130 or the plurality of connecting portions 137 is increased, the opening area of the drainage opening may be excessively reduced and the desired drainage capacity may not be obtained.
Therefore, the present inventors have a basic idea of lowering the position of the center of gravity of the drainage port filter downward in the Z-axis direction for the drainage port filter that can prevent floating due to the buoyancy of the sealing water 6 while maintaining an appropriate opening area. As a result, we conducted a diligent study. As a result, we came up with a configuration in which a part of the drainage port filter is pushed downward in the height direction (a configuration in which the drainage port filter 1 includes a filter top surface portion 11 and a filter bottom surface portion 13). Then, it was found that the drainage port filter 1 resists the buoyancy of the sealing water 6 by setting the depth of the filter bottom surface portion 13 to a predetermined value or more.
That is, in the drainage port filter 1 provided with the filter top surface portion 11 and the filter bottom surface portion 13, the drainage port filter 1 floats upward in the Z-axis direction by setting the depth of the filter bottom surface portion 13 to a predetermined value or more. It is possible to prevent the top surface portion 11 from moving away from the urinal drainage port 20.

Here, since the predetermined value depends on the diameter of the urinal drainage port, the amount of washing water, and the like, it differs depending on the type of the floor-standing urinal. Therefore, the present inventors have made extensive studies, and when the depth of the filter bottom portion 13 is 10 (mm) or more, in a plurality of types of floor-standing urinals, the drain port filter 1 is upward in the Z-axis direction. It was found that the uplift to the toilet can be suppressed.
Further, the present inventors, when the depth of the bottom surface portion 13 of the filter is 10 (mm) or more, the drainage port filter 1 rises upward in the Z-axis direction, and the top surface portion 11 of the filter is from the urinal drainage port 20. It was found that separation was more suppressed.

(Second Embodiment)
FIG. 6 is a schematic perspective view of the drainage port filter according to the second embodiment. FIG. 7 is a plan view of the drainage port filter shown in FIG. FIG. 8 is a cross-sectional view of the drainage port filter shown in FIG. The drainage port filter 1 includes a hollow cylindrical outer cylinder 16, an annular portion 17 formed in an annular shape, a grid portion 18 (corresponding to the “filter portion” in claim 1), and a leg portion 19. The annular portion 17 is formed so as to extend inward in the radial direction of the drain port filter 1 from the lower end portion of the inner peripheral surface of the outer cylinder 16.

The lattice portion 18 is composed of a plurality of first lattice portions 181 and a plurality of second lattice portions 182. The first grid portion 181 and the second grid portion 182 extend from the inner peripheral surface of the outer cylinder 16 and are orthogonal to each other. In the present embodiment, the first grid portion 181 extends parallel to the X axis, and the second grid portion 182 extends parallel to the Y axis. The plurality of first lattice portions 181 are arranged at equal intervals in the Y-axis direction. The plurality of second lattice portions 182 are arranged at equal intervals in the X-axis direction.

The leg portion 19 extends downward in the Z-axis direction from the grid portion 18. Two legs 19 are arranged at positions symmetrical to each other with the center of the drainage port filter 1 in a plan view as a point of symmetry. In the present embodiment, the leg portion 19 has a substantially rectangular first leg portion 191 formed on the ZX plane and extending downward in the Z-axis direction, and a substantially rectangular first leg portion 191 formed on the YZ plane and extending downward in the Z-axis direction. It is composed of two legs 192. The first leg portion 191 and the second leg portion 192 are connected at right angles to each other. The radial outer edge of the second leg 192 is connected to the central portion of the first leg 191 in the X-axis direction. That is, in the Z-axis direction view, the first leg portion 191 and the second leg portion 192 form a substantially T-shape.

A protruding portion 193 projects from the lower end portion 19a in the Z-axis direction of the leg portion 19 (second leg portion 192) toward the radial outer side of the drainage port filter 1. The radial outer end portion 193a of the protruding portion 193 is arranged outside the radial side of the drainage port filter 1 from the inner diameter of the annular portion 17 (flat surface 171). The protrusion 193 is formed so that when the drain filter 1 is installed in the urinal drain port 2, the radial outer end portion 193a of the protrusion 193 is in frictional contact with the inner peripheral surface of the drain pipe 2. The protrusion 193 has a slope portion 193c connecting the radial outer end portion 193a of the protrusion 193 and the lower end portion 193b of the protrusion 193.

The drainage opening 170 is formed by the annular portion 17. The drainage opening 170 is separated by a grid portion 18 (first grid portion 181 and second grid portion 182). As a result, the drainage opening 170 is divided into a plurality of drainage opening cell portions 170a. The drainage that has flowed into the drainage port filter 1 collides with the grid portion 18, and hair, dust, and the like that have flowed in together are captured. After that, the drainage passes through the drainage opening 170 and is discharged to the outside of the drainage port filter 1.

Here, the filtering ability of the grid portion 18 depends on the size of the drainage opening cell portion 170a. Further, if this size is excessively small, it becomes difficult for drainage to flow into the drain pipe 2 due to a decrease in the water passage area, which may cause an overflow. Therefore, it is desirable to obtain an appropriate size that can achieve both smooth drainage and filtering ability that can capture hair and the like through experiments and the like in advance.

The lattice portion 18 is made of a resin material having sufficient rigidity with respect to the water pressure of the drainage flowing into the drainage port filter 1. According to this structure, even if the drainage collides with the grid portion 18, the opening area of the drainage opening cell portion 170a does not change regardless of the flow rate and the momentum of the drainage. Therefore, it is possible to further suppress the flow of hair, dust, etc. flowing into the urinal drainage port into the drainage pipe together with strong drainage or a large amount of drainage. The lattice portion 18 is made of, for example, PP (polypropylene).

The drainage port filter 1 is supported and installed on the urinal drainage port 20 by bringing the flat surface 171 formed on the back surface of the annular portion 17 in the Z-axis direction into contact with the urinal drainage port 20 from above. The flat surface 171 extends to the XY plane. According to this installation method, the drainage port filter 1 is prevented from falling downward in the Z-axis direction. Therefore, even when the flow rate of the drainage flowing into the drainage port filter 1 is large or the momentum of the flowing drainage is strong, the drainage port filter 1 is suppressed from flowing into the drainage pipe 2.

In the second embodiment, the installation method of installing the drainage port filter 1 in the urinal drainage port 2 will be described below with reference to FIGS. 1, 2, 6 to 8. The flat surface 171 provided in the drainage port filter 1 faces the edge of the urinal drainage port 20, and the central axis extending in the Z-axis direction of the drainage port filter 1 coincides with the central axis of the urinal drainage port 20. Place the mouth filter 1. The drainage port filter 1 is installed in the urinal drainage port 2 by pushing down the drainage port filter 1 arranged at the above position downward in the Z-axis direction and bringing the flat surface 171 into contact with the edge of the urinal drainage port 20. ..
Here, as described above, the radial outer end portion 193a of the protruding portion 193 is arranged on the radial outer side of the drainage port filter 1 from the inner diameter of the annular portion 17 (flat surface 171). Further, the protruding portion 193 has a slope portion 193c connecting the radial outer end portion 193a of the protruding portion 193 and the lower end portion 193b of the protruding portion 193. Therefore, the process of pushing down the drainage port filter 1 downward in the Z-axis direction is (a) the process until the slope portion 193c abuts on the edge of the urinal drainage port 20, and (b) the slope portion 193c is the urinal drainage port 20. The process from the contact with the edge to the contact of the radial outer end 193a of the protrusion 193 with the edge of the drain port 2, (c) the radial outer end 193a of the protrusion 193 is on the edge of the drain port 2. The process is divided from the contact to the flat surface 171 until the flat surface 171 comes into contact with the edge of the urinal drainage port 20.
After the slope portion 193c abuts on the edge of the urinal drainage port 20 in (a), in the process of (b), the slope portion 193c slides with respect to the edge of the urinal drainage port 20 and the leg portion 19 Elastically deforms inward in the radial direction.
In the process of (c), since the elastic force returning to the radial outer side acts on the leg portion 19, the radial outer end portion 193a of the protruding portion 193 is discharged while frictionally contacting the inner peripheral surface of the drain pipe 2. It slides downward in the Z-axis direction along the inner peripheral surface of the pipe 2.

When the radial outer end portion 193a of the protruding portion 193 comes into frictional contact with the inner peripheral surface of the exhaust pipe 2, a frictional force acts on the movement upward in the Z-axis direction.
Therefore, it is possible to prevent the drainage port filter 1 from coming off the urinal drainage port 20. When the drainage pipe 2 causes a drainage failure and water collects in the drainage pipe 2 and the water level reaches the edge of the urinal drainage port 20, the buoyancy of the drainage in the drainage pipe 2 acts on the drainage port filter 1. Even in this case, according to the above configuration, the drainage port filter 1 resists the buoyancy of water, and the drainage port filter 1 is prevented from floating upward in the Z-axis direction.
Further, the soft scale can be removed when the drainage port filter 1 is installed in the urinal drainage port 20 and when it is removed from the urinal drainage port 20. Since the soft scale adheres to a place where bacteria are likely to grow, it is possible to suppress the growth of bacteria by removing the soft scale.

(Example)
It was examined whether the drainage filter floats from the urinal drainage port when the cleaning treatment is performed on the floor-standing urinal by changing the depth of the bottom surface of the filter in various ways. Specifically, a predetermined amount of drainage was allowed to flow into the urinal drainage port in a state where the drainage port filter having various depths of the bottom surface of the filter was installed at the drainage port of the floor-standing urinal. Then, if the drainage filter does not rise from the urinal drainage port while the drainage is flowing into the urinal drainage port, it is evaluated as ○, and if the drainage port filter rises from the urinal drainage port, it is evaluated as ×. did. This evaluation was performed visually after removing the plate of the floor-standing urinal. When using each drainage port filter, the amount of drainage flowing into the urinal drainage port and the urinal drainage port to be installed shall be the same.
Table 1 shows the depth of the bottom surface of each drainage filter used in the above study and the evaluation results of each drainage filter.

From Table 1 above, when the depth of the bottom surface portion 13 of the filter was 10 mm or more, the drainage port filter 1 did not rise, and the top surface portion 11 of the filter did not separate from the urinal drainage port 20. This is because by setting the depth of the bottom surface portion 13 of the filter to 10 mm or more, the position of the center of gravity of the drainage port filter 1 is lowered to an appropriate position below the Z-axis direction, and the buoyancy of the sealing water can be resisted. it is conceivable that.

(Modification 1)
In the first embodiment, two fourth annular portions 120 are arranged, but the present invention is not limited to this. Only one fourth annular portion 120 may be arranged, and three or more may be arranged.

(Modification 2)
In the first embodiment, the drainage port filter 1 is installed in the urinal drainage port 20 in the floor-standing urinal 10. However, the present invention is not limited to this, and the drainage port filter 1 may be installed at the urinal drainage port in the wall-mounted urinal in which the trap portion 5 is formed.

1: Drainage port filter 2: Drainage pipe 10: Floor-standing urinal 11: Filter top surface 12: Filter bottom surface 13: Filter bottom surface 15, 136, 170: Drainage opening 15a, 136a, 170a: Drainage opening 20: Urinal drainage port 110, 171: Flat surface 19: Leg 193: Protruding part 193a: Radial outer end of the protruding part 193b: Lower end of the protruding part 193c: Slope

Claims (6)

The drainage pipe provided with a drainage opening for passing the drainage of a urinal having a trap portion formed so as to surround the drainage pipe, and a filter portion arranged so as to separate the drainage opening. It is a drainage port filter provided in the urinal drainage port formed at the upper end of the
The drainage opening is divided into a plurality of drainage opening cell portions by the filter portion.
The filter portion is made of a resin material and is made of a resin material.
A drainage port filter, characterized in that the opening area of each drainage opening cell portion does not change when the drainage collides with the filter portion. It has a flat surface extending in a plane direction perpendicular to the height direction of the drainage port filter.
The drainage port filter according to claim 1, wherein the drainage port filter is supported by the urinal drainage port by contacting the flat surface with the edge of the urinal drainage port. The filter portion has a filter top surface portion, a filter bottom surface portion, and a filter side surface portion connecting the filter top surface portion and the filter bottom surface portion.
The flat surface is formed on the lower surface of the filter top surface portion in the height direction.
The drainage port filter according to claim 2 , wherein the depth of the bottom surface of the filter is a predetermined value (mm) or more. The drainage port filter according to claim 3, wherein the predetermined value is 10 (mm). It has legs that extend downward in the height direction.
The leg comprises a protrusion extending radially outward from the leg.
In an installed state in which the drainage port filter is installed in the drainage opening, the radially outer end of the protrusion is in frictional contact with the inside of the drainage pipe provided with the urinal drainage port. The drainage port filter according to claim 2 . The drainage port filter according to claim 5, wherein the protruding portion has a slope portion connecting a radial outer end portion of the protruding portion and a lower end portion of the protruding portion.

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