JP2021070957A - Water discharging drain for eaves gutter - Google Patents

Abstract

To provide a water discharging drain for an eaves gutter capable of enhancing straightening effect and suppressing a water discharging function from decreasing even if an opening of an outer peripheral part is blocked with foreign matter flowing in the eaves gutter.SOLUTION: A water discharging drain 10 for an eaves gutter is installed penetrating a through hole formed in a bottom plate part of the eaves gutter, and includes: a water discharging cylinder part 11; blades 30 coupled to a plurality of circumferential positions of an upper end of the water discharging cylinder part 11; an inner cylinder part 40 coupled to radially inner ends of the plurality of blades 30, extending in a vertical direction, and having a lower end facing an inner space of the water discharging cylinder part 11; and a funnel part 41 spreading radially outward continuously from an upper end of the inner cylinder part 40.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to drainage drainage for eaves gutters.

Conventionally, rainwater that has flowed down into an eaves gutter attached to the roof of a building is collected, sent to a gutter, and discharged from below through the gutter. At this time, in order to increase the amount of wastewater treated in the gutter, it is conceivable to efficiently drain a large amount of rainwater by siphon action. At this time, it is conceivable to attach a member having a function of reducing air suction due to the vortex to the through hole of the eaves gutter.

Patent Document 1 describes a drainage member (drainage drain for eaves gutter) to be attached to the eaves gutter. A plurality of drainage members are arranged at intervals in the circumferential direction by connecting a plate-shaped lid member arranged at the upper end, a mounting cylinder fitted to a gutter on a downspout, and a lid member and a mounting cylinder. It is equipped with vertical ribs. It is said that the vertical ribs form an inflow opening between the lower surface side of the lid member and the bottom surface of the eaves gutter, and the vertical ribs can have a rectifying effect, so that rainwater can suppress the inhalation of air. ..

Japanese Patent No. 6279795

In the drainage drain for eaves gutter described in Patent Document 1, the opening of the outer peripheral portion formed between the lid member and the vertical rib is closed by foreign matter such as fallen leaves sent by rainwater flowing in the eaves gutter. This may reduce the drainage function.

An object of the present disclosure is to provide a drainage drain for an eaves gutter that can enhance the rectifying effect and suppress a deterioration of the drainage function even when a foreign substance flowing in the eaves gutter blocks the opening of the outer peripheral portion.

The drainage drain for an eaves gutter according to one aspect of the present disclosure is a drainage drain for an eaves gutter installed so as to penetrate a through hole formed in a bottom plate portion of the eaves gutter, and is a drainage cylinder portion and a drainage cylinder portion. The blades connected at multiple positions in the circumferential direction of the upper end, the inner cylinder part connected to the radial inner ends of the multiple blades and extending in the vertical direction, and the lower end facing the inner space of the drainage cylinder part, and the inner cylinder part A drainage drain for an eaves gutter, comprising a funnel portion that continuously extends outward in the radial direction from the upper end to the upper side.

According to the drainage drain for the eaves gutter of one aspect of the present disclosure, the rectifying effect can be enhanced, and even when the foreign matter flowing in the eaves gutter blocks the opening of the outer peripheral portion, the deterioration of the drainage function can be suppressed.

It is a figure which shows the cross section of the schematic structure of the eaves gutter drainage structure including the eaves gutter drainage drain of an embodiment. FIG. 5 is an enlarged view of part A of FIG. 1 showing a drainage drain for an eaves gutter of the embodiment. It is a perspective view of the drainage drain for an eaves gutter shown in FIG. 2 as seen from above. FIG. 3 is a cross-sectional view taken along the line BB of FIG. In the first to fifth embodiments corresponding to the embodiment and another example of the embodiment, evaluation of rectification property, inflow property into the funnel portion, and stability of high drainage performance when the shape of the blade is changed. It is a figure which shows the result. It is a figure which shows two examples when the state which installed in the eaves gutter is seen from the top in the drainage drain for the eaves gutter of another example of embodiment. It is a figure corresponding to FIG. 4 in the drainage drain for an eaves gutter of another example of an embodiment.

Hereinafter, an embodiment of the drainage drain for an eaves gutter according to the present disclosure will be described with reference to the drawings. The shapes, numbers, numerical values, materials, etc. described below are examples for explanation and can be appropriately changed depending on the specifications of the eaves gutter drainage drain or the eaves gutter drainage structure including the eaves gutter drainage drain. In the following, the equivalent elements will be described with the same reference numerals in all the drawings.

The embodiment will be described with reference to FIGS. 1 to 4. FIG. 1 is a diagram showing a cross section of a schematic configuration of an eaves gutter drainage structure 80 including an eaves gutter drainage drain 10 of the embodiment. FIG. 2 is an enlarged view of part A of FIG. 1 showing a drainage drain 10 for an eaves gutter. FIG. 3 is a perspective view of the drainage drain 10 for an eaves gutter shown in FIG. 2 as viewed from above. FIG. 4 is a cross-sectional view taken along the line BB of FIG.

As shown in FIG. 1, the eaves gutter drainage structure 80 includes an eaves gutter 81, an eaves gutter drainage drain 10 installed in the eaves gutter 81, a gutter joint 90 (FIG. 2), a gutter 94, and a vertical. It is equipped with a gutter 96 and can be attached to a building (not shown). In FIG. 1, the side away from the building (left side in FIG. 1) is the front side, and the side close to the building (right side in FIG. 1) is the left side.

The eaves gutter 81 is a resin molded product, and has a bottom plate portion 82, a front wall 83 erected from the front end of the bottom plate portion 82, and a rear wall 84 erected from the rear end of the bottom plate portion 82, and has a cross section. It is formed in a groove shape. The eaves gutter 81 is suspended by a hanging tool (not shown) attached to the building, and is formed so as to receive rainwater flowing down from the eaves of the roof.

A through hole 82a is formed in the bottom plate portion 82 of the eaves gutter 81. The drainage drain 10 for the eaves gutter is installed so as to penetrate through the through hole 82a. Hereinafter, the drainage drain 10 for the eaves gutter will be referred to as a drainage drain 10. The structure of the drainage drain 10 will be described in detail later.

The upstream elbow 97 and the downstream elbow 98 are connected to both ends of the gutter 94. The calling gutter 94 allows rainwater introduced from the eaves gutter 81 via the drainage drain 10 and the upstream elbow 97 to flow laterally, and is introduced into the gutter 96 via the downstream elbow 98. In FIG. 1, rainwater is shown by the sandy area.

As shown in FIG. 2, the gutter joint 90 has a tubular portion 91 and an outward flange 92 formed at the upper end of the tubular portion 91. A female screw is formed on the inner peripheral surface of the tubular portion 91. The downspout joint 90 is connected to the upper end portion of the upstream elbow 97 by fitting the tubular portion 91 inside the large diameter tubular portion 97a formed at the upper end of the upstream elbow 97. A drainage drain 10 is installed in the eaves gutter 81, and a male screw formed on the outer peripheral surface of the lower half of the drainage drain 10 is formed in a state where the lower half of the drainage drain 10 protrudes downward from the through hole 82a. , It is connected to the female screw of the gutter joint 90. In this state, as will be described later, the outward flange 92 of the vertical gutter joint 90 and the upper half of the drainage drain 10 sandwich the bottom plate portion 82 of the eaves gutter 81 from both the upper and lower sides, and the drainage drain 10 and the drainage drain 10 and the drainage drain 10 are sandwiched between the eaves gutter 81. Fix the gutter joint 90.

The gutter 96 is fixed to the building along the outer wall surface of the building by a plurality of fixtures (not shown) or the like in the vertical direction. The lower end of the gutter 96 may be connected to a drainage pipe buried in the ground, and rainwater flowing down the gutter 96 may be drained to the drainage pipe.

Next, the drainage drain 10 will be described in detail with reference to FIGS. 2 to 4. The drainage drain 10 is a drainage member having a high drainage function of rainwater when a large amount of rainwater flows into the eaves gutter 81, such as during heavy rain. The drainage drain 10 includes a lower drainage cylinder portion 11, blades 30 connected to a plurality of positions in the circumferential direction of the upper end of the drainage cylinder portion 11, and an inner cylinder portion 40 connected to the radial inner ends of the plurality of blades 30. And a funnel portion 41 continuous with the upper end of the inner cylinder portion 40. The drainage drain 10 is formed by injection molding of a hard vinyl chloride resin or a resin such as polycarbonate or ABS. The drainage drain 10 may be made of a metal such as cast iron.

As shown in FIG. 4, the drainage cylinder portion 11 includes a cylindrical portion 12 having a male screw 13 formed on the outer peripheral surface thereof, and an outward flange 16 formed at the upper end thereof. The inner peripheral surface of the upper end of the cylindrical portion 12 and the upper surface of the inner peripheral end of the outward flange 16 are connected by a connecting portion 14 whose inner peripheral surface is a smooth curved surface having an arc-shaped cross section. The male screw 13 can be screwed into the female screw formed on the downspout joint 90. In FIG. 3, the male screw of the drainage cylinder portion 11 is omitted.

An annular notch 17 is formed on the outer peripheral surface of the outward flange 16 over the entire circumference, whereby the thickness of the outward flange 16 is smaller than the thickness of the upper end of the connecting portion 14. The stepped surface 18 which is the boundary between the notch 17 and the connecting portion 14 is a cylindrical surface having a diameter substantially the same as the inner diameter of the through hole 82a formed in the eaves gutter 81. As a result, the drainage cylinder portion 11 can lock the outward flange 16 to the peripheral edge portion of the through hole 82a in the bottom plate portion 82 in a state where the stepped surface 18 is fitted into the through hole 82a. A portion partitioned by a plurality of blades 30 described later between the outer peripheral end of the upper side surface of the outward flange 16 and the outer peripheral end of the upper end portion of the funnel portion 41 described later drains rainwater flowing into the eaves gutter 81. It becomes an inflow opening 20 for introduction into.

The plurality of blades 30 have a plate shape connected to a plurality of positions in the circumferential direction of the upper end of the drainage cylinder portion 11 so as to extend from the upper end of the outer peripheral portion of the outward flange 16 to the inner peripheral end of the lower end portion of the connecting portion 14. It extends in the radial direction. The radial outer end of each blade 30 is a flat surface substantially parallel to the central axis O (FIG. 4) of the drainage cylinder portion 11, or a tapered surface slightly inclined radially outward toward the lower end. Each blade 30 may be inclined with respect to the radial direction in a plan view. Both sides of each blade 30 in the circumferential direction are flat, but may be curved.

At the upper end of each blade 30, a protruding portion 31 is formed so as to project upward from a position separated radially outward from the outer peripheral end of the upper end of the funnel portion 41 described later. As a result, a part of each blade 30 protrudes upward from the upper end of the funnel portion 41 from a position separated radially outward from the outer peripheral end of the upper end of the funnel portion 41. Further, a notch 32 having a substantially rectangular cross section is formed in the radial inner portion of the lower end of each blade 30. The plurality of blades 30 have a function of rectifying rainwater that has flowed in from the inflow opening 20. The notch 32 enhances the drainage function of the rainwater flowing in from the inflow opening 20.

As will be described later, the number of the plurality of blades 30 is preferably an odd number from the viewpoint of increasing the inflow of rainwater into the funnel portion 41 regardless of the phase of the drainage drain 10 with respect to the eaves gutter 81 in the circumferential direction. .. More preferably, the number of the plurality of blades 30 is 5.

The inner cylinder portion 40 is a cylindrical portion that is connected to the lower portion of the radial inner ends of the plurality of blades 30 and extends in the vertical direction, and the lower end thereof faces the inner space of the drainage cylinder portion 11.

The funnel portion 41 extends radially outward in a trumpet shape from the upper end of the inner tubular portion 40 continuously upward. The conical inner and outer peripheral surfaces of the funnel portion 41 and the inner and outer peripheral surfaces of the inner tubular portion 40 are smoothly connected by a curved surface including a curved surface portion having an arc-shaped cross section.

A disk-shaped outward flange 42 is formed at the upper end of the funnel portion 41. The funnel portion 41 is connected to the upper portion of the radial inner ends of the plurality of blades 30. The upper end outer diameter D1 of the funnel portion 41 is smaller than the inner diameter D2 of the cylindrical inner peripheral surface of the cylindrical portion 12 of the drainage cylinder portion 11 (D1 <D2). The central axes O of the funnel portion 41, the inner cylinder portion 40, and the drainage cylinder portion 11 are aligned.

In this example, the male screw 13 is formed on the outer peripheral surface of the drainage cylinder portion 11, but the male screw may be omitted and the lower portion of the drainage cylinder portion may be a simple cylindrical cylinder portion. In this case, the inner peripheral surface of the gutter joint 90 is a cylindrical surface having no female screw, and the gutter joint 90 is fitted and joined to the lower portion of the drainage cylinder portion 11.

Further, the height a from the lowermost end 33 in the portion of each blade 30 that has entered the inside of the drainage cylinder portion 11 to the upper end of the notch 32 is 20 mm or less and 5 mm or more, and is inside from the lowermost end 33 of each blade 30. The height b to the lower end of the tubular portion 40 is 15 mm or less. In FIG. 4, the height position of the lowermost end 33 of each blade 30 is shown by a reference line. As shown in FIG. 4, the height a from the lowermost end 33 of each blade 30 to the upper end of the notch 32 and the height b from the lowermost end 33 of each blade 30 to the lower end of the inner cylinder 40 are made to match. You may.

Further, the funnel cylinder height c, which is the length from the lower end of the outward flange 42 at the upper end of the funnel portion 41 to the lower end of the inner cylinder portion 40, is 30 to 55 mm. Further, when viewed in a cross section including the central axis O of the funnel portion 41, the funnel angle θ, which is the spreading angle of the conical inner peripheral surface, is 80 to 120 degrees.

A method of assembling the eaves gutter drainage structure 80 including the above drainage drain 10 will be described. First, a through hole 82a is formed at a position where the drainage drain 10 is attached in the bottom plate portion 82 of the eaves gutter 81. Next, the drainage drain 10 is inserted into the eaves gutter 81, the drainage cylinder portion 11 is first inserted into the through hole 82a of the eaves gutter 81 to project downward, and the outward flange 16 is inserted into the through hole 82a of the bottom plate portion 82. Locks to the periphery of the. At this time, packing or the like may be interposed between the outward flange 16 and the peripheral edge of the through hole 82a. Then, a vertical gutter joint 90 is fixed to the outer peripheral side of the drainage cylinder portion 11 protruding downward from the through hole 82a of the eaves gutter 81 by a screw connection or the like, and the outward flange 16 of the drainage cylinder portion 11 and the vertical gutter The bottom plate portion 82 of the eaves gutter 81 is sandwiched and fixed from both the upper and lower sides with the outward flange 92 (FIG. 2) provided at the upper end of the joint 90. In this state, the upper end of the eaves gutter 81 is made higher than the upper ends of the blade 30 of the drainage drain 10 and the funnel portion 41. As a result, rainwater can flow into the drainage drain 10 from the upper end of the funnel portion 41 when the eaves gutter 81 is full. After that, the downspout 96 is connected to the downspout joint 90 via the upstream elbow 97, the nominal gutter 94, and the downstream elbow 98. Then, in the used state, the downspout 96 is arranged so as to extend in the vertical direction.

According to such an eaves gutter drainage structure 80, rainwater that has fallen on the roof flows into the eaves gutter 81, flows in through the inflow opening 20 of the drainage drain 10, passes through the inside of the drainage cylinder portion 11, and is called a gutter 94. It is introduced into the gutter 96 via such as. In this state, the rainwater flowing down the gutter 96 is vigorously drained downward from the gutter 96 due to the siphon phenomenon. As shown in FIG. 1, when the amount of rainwater flowing through the gutter 96 exceeds a predetermined flow rate, a part of the gutter 96 is clogged with rainwater to form a stopper (the portion indicated by β in FIG. 1). Then, a negative pressure is generated at the plug portion due to the height difference, the force for pulling the rainwater downward becomes large, and a siphon phenomenon occurs in which the rainwater flows down vigorously. The downstream side of the gutter 96 may be filled with water by connecting a drainage pipe to the downstream end of the gutter 96 when rainwater flows down.

According to the drainage drain 10 described above, when rainwater flows in from the inflow opening 20, the effect of rectifying the rainwater can be enhanced by the plurality of blades 30. As a result, when a large amount of rainwater flows into the inflow opening 20, it is possible to prevent air from being sucked into the gutter 96 due to the generation of a vortex. Further, at the inflow opening 20, it is possible to prevent foreign substances such as fallen leaves from being sucked into the gutter 96 by the plurality of blades 30. As a result, in the eaves gutter drainage structure 80 including the drainage drain 10, excellent siphon performance can be exhibited and drainage can be improved. Further, even if the foreign matter flowing in the eaves gutter 81 blocks at least a part of the inflow opening 20 which is the outer peripheral portion of the drainage drain 10, rainwater flows in from the funnel portion 41 which opens upward, so that the drainage is drained. It is possible to suppress the deterioration of the function.

Further, according to the drainage drain 10 described above, the inner cylinder portion 40 and the funnel portion 41 are smoothly connected by a curved surface, and a notch 32 is formed inside the lower end of each blade 30 in the radial direction. Further, the height from the lowermost end 33 in the portion of each blade 30 that has entered the drainage cylinder portion 11 to the upper end of the notch 32 is 20 mm or less and 5 mm or more, and the lowermost end 33 of each blade 30 to the inner cylinder portion 40. The height to the lower end shall be 15 mm or less. As a result, the high drainage performance of the drainage drain 10 can be stabilized. For example, when the height of the rainwater in the eaves gutter 81 is a high water level of 120 mm, the pulling force of the rainwater in the gutter 96 can be stably generated at a high value. Further, when the height of the rainwater in the eaves gutter 81 is 70 mm, the pulling force of the rainwater in the gutter 96 is lower than that in the case of the high water level, but it can be stably generated. ..

The result of the simulation performed to confirm this effect will be described. In the simulation, the height from the lowermost end 33 in the portion of each blade 30 that has entered the drainage cylinder portion 11 to the upper end of the notch 32 is defined as the "blade notch height a", and the height from the lowermost end 33 of each blade 30 to the inside. The height to the lower end of the tubular portion 40 was defined as "the lower end height b of the funnel portion". In this case, the blade notch height a and the funnel lower end height b were variously changed, and the stability of high drainage performance was evaluated by simulation. The evaluation results are shown in Table 1.

The evaluation results are shown in the "Stability evaluation" column of Table 1. This evaluation was divided into A, B, and C, and the best evaluation was given as A, and the evaluation was given as B and C in ascending order. As can be understood from the results in Table 1, the stability evaluation was the best when the blade notch height a was 15 mm or less, 5 mm or more, and the funnel lower end height b was 15 mm or less. Further, although not shown in the results of Table 1, it is presumed that even when the blade notch height a is 20 mm and the funnel lower end height b is 15 mm or less, it is equivalent to the case of stability evaluation A. .. As a result, the effect of the embodiment could be confirmed.

Further, in the embodiment, the height b at the lower end of the funnel portion is preferably 10 to 15 mm, more preferably 15 mm so that the internal flow path becomes wider from the viewpoint of preventing clogging of fallen leaves and the like.

Further, according to the drainage drain 10 of the embodiment, a part of each blade 30 protrudes upward from the upper end of the funnel portion 41 from a position separated radially outward from the outer peripheral end of the upper end of the funnel portion 41. As a result, the water flow to the funnel portion 41 is easily introduced, and the vortex is less likely to be generated in the vicinity of the blade 30.

The result of the simulation performed to confirm this effect will be described. FIG. 5 shows the rectification property, the inflow property to the funnel portion 41, and the high drainage when the shape of the blade 30 is changed in the first to fifth embodiments corresponding to the embodiment and another example of the embodiment. The evaluation result of performance stability is shown. The first embodiment corresponds to the embodiment shown in FIGS. 1 to 4. The second to fifth examples correspond to four examples of another example of the embodiment.

In the second embodiment, the upper end of the blade 30 is not formed with a protrusion, and the upper end of the blade 30 is aligned with the upper end of the funnel portion 41. In the third embodiment, as in the second embodiment, no protrusion is formed at the upper end of the blades 30, and the radial outer end of each blade 30 is tapered outward in the radial direction toward the lower end. The surface is 34. In the fourth embodiment, similarly to the first embodiment, a protruding portion 31a protruding from the upper end of the funnel portion 41 is formed at the upper end of the blade 30, but the protruding portion 31a is formed from the outer peripheral end of the upper end of the funnel portion 41. It is continuously formed up to the outer end in the radial direction. In the fifth embodiment, similarly to the fourth embodiment, a protruding portion 31b is formed at the upper end of the blade 30 so as to be continuous from the outer peripheral end of the upper end of the funnel portion 41 and project from the upper end of the funnel portion 41. The protruding portion 31b is formed only on the radial inner portion of the blade 30.

The right column of FIG. 5 shows the evaluation results of the rectification property, the inflow property into the funnel portion 41, and the stability of the high drainage performance in the first to fifth embodiments. This evaluation was divided into A, B, and C, and the best evaluation was given as A, and the evaluation was given as B and C in ascending order. As can be understood from the result of FIG. 5, according to the first embodiment in which the projecting portion 31 is formed, as in the embodiment of FIGS. 1 to 4, the water flow can be easily introduced into the funnel portion 41 and the blades can be easily introduced. It was confirmed that the vortex was less likely to be generated in the vicinity of 30, and the evaluation was the best A. On the other hand, in the case of the second embodiment, since the blade 30 does not have a protruding portion, the flow into the funnel portion 41 is reduced. In the case of the fourth embodiment and the fifth embodiment, the protruding portions 31a and 31b are continuously formed from the outer peripheral end of the funnel portion 41, so that a vortex is generated in the vicinity of the blade 30 of the inflow portion (inflow opening). It became easier to do. In the case of the second embodiment, the fourth embodiment and the fifth embodiment, the evaluation was B in the middle. In the case of the third embodiment, it became easy to shift to the intermittent siphon in which siphons were generated discontinuously, the high drainage performance became unstable, and the evaluation was C below.

Further, according to the drainage drain 10 of the embodiment, the number of the plurality of blades 30 is an odd number. As a result, the inflow property of rainwater into the funnel portion 41 can be increased regardless of the phase of the drainage drain 10 with respect to the eaves gutter 81 in the circumferential direction. This will be described with reference to FIG.

FIG. 6 shows two examples of the drainage drain 10a of another example of the embodiment when the state of being installed in the eaves gutter 81 is viewed from above. In FIG. 6, the drainage drain 10a is schematically shown except for the funnel portion 41 (FIG. 4). The drainage drain 10a has a configuration in which the number of blades 30 is 4 unlike the configurations shown in FIGS. 1 to 4. In this example, other configurations are the same as those of the drainage drain 10 of FIGS. 1 to 4. In FIG. 6A, a drainage drain 10a is attached to the through hole of the eaves gutter 81 so that the two blades 30 are orthogonal to the longitudinal direction of the eaves gutter 81 (the left-right direction of FIG. 6A). .. In FIG. 6B, the drainage drain 10a is attached to the through hole of the eaves gutter 81 in a state where the drainage drain 10a is rotated by 45 degrees with respect to FIG. 6A. In the state of FIG. 6A, since the two blades 30 are arranged so as to extend in the width direction orthogonal to the longitudinal direction of the eaves gutter 81, the flow of rainwater in the eaves gutter 81 in the arrow α direction is caused by the blades 30. It becomes easy to be disturbed. As a result, the flow of the drainage drain 10a into the funnel portion 41 at the upper end is weakened. On the other hand, in the state of FIG. 6B, both of the two blades 30 are not arranged so as to extend in the width direction of the eaves gutter. As a result, the drainage drain 10a can be made to flow into the funnel portion 41 more strongly. As a result, the inflow of rainwater into the funnel portion 41 can be increased. In FIG. 6, it has been explained that the inflow property into the funnel portion 41 may decrease when the number of blades 30 is 4, but when the number of blades is an even number such as 2, 6 or the like, the blades may decrease. It is the same as the case where the number of sheets is 4. On the other hand, when the number of blades 30 of the drainage drain 10 is an odd number such as 5, as in the configuration of FIGS. 1 to 4, the inflow property does not decrease as in the case of an even number.

Table 2 shows the results of experimental evaluation of the inflow of rainwater and the degree of vortex generation when the number of blades was varied.

The evaluations shown in Table 2 were divided into A, B, and C, with the best evaluation being A, and the evaluations being lower than that, B and C. As can be understood from the results in Table 2, when the number of blades 30 is an odd number (in the case of 3 blades and 5 blades), rainwater is applied to the funnel portion 41 as in the embodiment of FIGS. Easy to flow in. Further, when the number of blades 30 is 5, the inflow opening 20 becomes close to an appropriate size, so that vortices are less likely to be generated, and rainwater can easily flow into the funnel portion 41 in a stable manner. On the other hand, when the number of blades 30 is 3, the inflow opening is large and vortices are likely to be generated.

On the other hand, when the number of blades 30 is an even number (in the case of 4 or 6 blades), it may be difficult for rainwater to flow into the funnel portion 41 depending on the orientation at the time of construction, which may worsen. When the number of blades 30 is 4, the inflow opening 20 is large and vortices are likely to be generated. When the number of blades 30 was 6, the inflow opening 20 was narrow and the fallen leaves were easily clogged. As a result, the effect of the embodiment could be confirmed.

Further, according to the drainage drain 10 of the embodiment shown in FIGS. 1 to 4, the upper end outer diameter D1 of the funnel portion 41 is smaller than the inner diameter D2 of the cylindrical inner peripheral surface of the drainage cylinder portion 11. Further, the funnel cylinder height c, which is the length from the lower end of the outward flange 42 at the upper end of the funnel portion 41 to the lower end of the inner cylinder portion 40, is 30 to 55 mm. Further, when viewed in a cross section including the central axis O of the funnel portion 41, the funnel angle θ, which is the spreading angle of the conical inner peripheral surface, is 80 to 120 degrees. Thereby, the high drainage performance of the drainage drain 10 can be further stabilized. The result of the simulation performed to confirm this effect will be described. In Table 3, when the number of blades 30 was 5, the funnel angle and the funnel tube height were variously different to evaluate the stability of high drainage performance.

Table 3 shows the stability evaluation results in the stability evaluation column. This evaluation was divided into A, B, C, and D, with the best evaluation being A, and the evaluations being B, C, and D in ascending order.

As can be understood from the results in Table 3, when the funnel angle θ is 80 to 120 degrees and the funnel tube height c is in the range of 30 to 55 mm, the funnel tube height c is not increased (for example, the funnel). Even when the cylinder height c was 33 mm), the evaluation of stability was C or higher, and it was confirmed that the stability of high drainage performance could be improved. When the funnel tube height c is 23 mm, intermittent siphons occur in the eaves gutter drainage structure including the drainage drain regardless of whether the funnel angle θ is 90 degrees, 120 degrees, or 140 degrees. Became unstable. As a result, the effect of the embodiment could be confirmed.

FIG. 7 is a diagram corresponding to FIG. 4 in another example of the drainage drain 10b for an eaves gutter of the embodiment. In the case of the configuration of this example, unlike the configurations of FIGS. 1 to 4, the notch height a of each blade 30 is increased to increase the height dimension of the notch 32, and the notch 32 is formed. The inner cylinder portion 40 is projected below the upper end. Even in such a configuration, when the notch height a of the blade 30 is 20 mm or less and the lower end height b of the funnel portion is 15 mm or less, the high drainage performance is the same as in the configurations of FIGS. 1 to 4. Can increase the stability of. Further, even when the notch height a and the funnel lower end height b are not within the above ranges, the rectifying effect can be enhanced and the foreign matter flowing in the eaves gutter 81 can be increased as in the configurations of FIGS. 1 to 4. Even when the opening on the outer periphery is closed, the effect of suppressing the deterioration of the drainage function can be obtained. In this example, other configurations and operations are the same as those of FIGS. 1 to 4.

The drainage drain of the present disclosure may be configured to include only one of the following configurations (1) to (5).
(1) The inner cylinder portion 40 and the funnel portion 41 are smoothly connected by a curved surface, and a notch 32 is formed inside the lower end of each of the plurality of blades 30 in the radial direction, and the plurality of blades 30 have a notch 32 formed therein. In each case, the height from the lowermost end 33 in the portion of the drainage cylinder 11 to the upper end of the notch 32 is 20 mm or less and 5 mm or more, and the lowermost end 33 of each of the plurality of blades 30 to the inner cylinder 40. The height to the lower end is 15 mm or less.
(2) A part of each of the plurality of blades 30 protrudes upward from the upper end of the funnel portion 41 from a position separated radially outward from the outer peripheral end of the upper end of the funnel portion 41.
(3) The number of the plurality of blades 30 is an odd number.
(4) The number of the plurality of blades 30 is 5.
(5) The outer diameter of the upper end of the funnel portion 41 is smaller than the inner diameter of the cylindrical inner peripheral surface of the drainage cylinder portion 11, and an outward flange 42 is formed at the upper end of the funnel portion 41. The funnel cylinder height, which is the length from the lower end to the lower end of the inner cylinder portion 40, is 30 to 55 mm, and when viewed in a cross section including the central axis of the funnel portion 41, a conical inner peripheral surface. The funnel angle, which is the spread angle of, is 80 to 120 degrees.

Further, the drainage drain of the present disclosure may have a configuration in which any of 2 to 4 is selectively combined from the configurations (1) to (5) described above, or (1) to (5). ) May be included.

10, 10a, 10b Drainage drain for eaves gutter (drainage drain), 11 drainage cylinder part, 12 cylindrical part, 13 male screw, 14 connection part, 16 outward flange, 17 notch, 18 step surface, 20 inflow opening, 30 Blades, 31, 31a, 31b protruding parts, 32 notches, 33 bottom edge, 34 tapered surface, 40 inner cylinder part, 41 funnel part, 42 outward flange, 80 gutter drainage structure, 81 gutter, 82 bottom plate, 82a through hole, 83 front wall, 84 rear wall, 90 gutter joint, 91 cylinder, 92 outward flange, 94 gutter, 96 gutter, 97 upstream elbow, 97a large diameter cylinder, 98 downstream elbow.

Claims (6)

A drainage drain for an eaves gutter that is installed so as to penetrate a through hole formed in the bottom plate of the eaves gutter.
Drainage tube and
The blades connected to the upper end of the drainage cylinder at a plurality of positions in the circumferential direction,
An inner cylinder portion that is connected to the radial inner ends of the plurality of blades and extends in the vertical direction, and the lower end thereof faces the inner space of the drainage cylinder portion.
A funnel portion that continuously extends outward in the radial direction from the upper end of the inner cylinder portion is provided.
Drainage drain for eaves gutters. In the drainage drain for the eaves gutter according to claim 1,
The inner cylinder portion and the funnel portion are smoothly connected by a curved surface.
A notch is formed inside the lower end of each of the plurality of blades in the radial direction.
The height from the lowermost end of each of the plurality of blades into the drainage cylinder portion to the upper end of the notch is 20 mm or less and 5 mm or more, and the height from the lowermost end of each of the plurality of blades to the inner side thereof. The height to the lower end of the cylinder is 15 mm or less.
Drainage drain for eaves gutters. In the drainage drain for the eaves gutter according to claim 1 or 2.
Each part of the plurality of blades protrudes upward from the upper end of the funnel portion from a position radially outward from the outer peripheral end of the upper end of the funnel portion.
Drainage drain for eaves gutters. In the drainage drain for an eaves gutter according to any one of claims 1 to 3.
The number of the plurality of blades is an odd number,
Drainage drain for eaves gutters. In the drainage drain for eaves gutter according to claim 4,
The number of the plurality of blades is 5.
Drainage drain for eaves gutters. In the drainage drain for an eaves gutter according to any one of claims 1 to 5.
The outer diameter of the upper end of the funnel portion is smaller than the inner diameter of the cylindrical inner peripheral surface of the drainage cylinder portion.
An outward flange is formed at the upper end of the funnel portion, and the funnel cylinder height, which is the length from the lower end of the outward flange to the lower end of the inner cylinder portion, is 30 to 55 mm, and the funnel portion The funnel angle, which is the spreading angle of the conical inner peripheral surface, is 80 to 120 degrees when viewed in a cross section including the central axis of.
Drainage drain for eaves gutters.

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