JP2008081939A5 - - Google Patents

Description

Silencer structure and silencer component

The present invention relates to a silencing structure and a silencing space constituting member for attenuating sound when drainage is sucked into a drain pipe.

  Conventionally, a drainage structure using a siphon phenomenon (hereinafter referred to as a siphon drainage system) has been proposed (see, for example, Patent Documents 1 and 2). The “siphon phenomenon” described here refers to a phenomenon that causes a suction action on the upstream side of the liquid when the liquid falls in a substantially full state. The siphon drainage system performs this suction action. This is a mechanism for sucking the subsequent drainage.

  When the siphon drainage system is adopted, the drainage gradient (usually 1/50 to 1/200) that is essential in the conventional natural drainage drainage system is not necessarily required for the horizontal piping inside the building.

  In addition, if this drainage system is applied to miscellaneous drainage such as sinks, washbasins, or unit baths, and rainwater drainage from roof drains, the drainage pipe can be made smaller while ensuring the drainage flow rate. There is an advantage that the space can be made smaller, and the degree of freedom of design and construction of the building is increased.

  As a rainwater drainage structure for reliably generating siphon drainage, the present inventor has proposed in Patent Document 1 to provide a water reservoir (drainage chamber) between a drain outlet and a small-diameter drain pipe downstream. Yes.

  This water reservoir is used to store the waste water that has flowed into the drain outlet in the uppermost stream portion of the siphon drainage system to secure the head pressure and to push the waste water against the upward slope of the horizontal pipe. As a result, it is possible to generate a siphon phenomenon and exert a suction action inside the drain pipe downstream.

  By the way, in designing rainwater drainage, it is usual to design so that the drainage capacity always exceeds the amount of rainwater to be drained. This does not change even with the drainage structure using the siphon phenomenon. Therefore, a phenomenon in which air is sucked from the drainage port by the suction action due to the excess drainage capacity may occur, and a suction sound may be generated.

  Here, there are two types of air suction sound in the siphon drainage system. One is the sound of inhaling air continuously, and the other is the sound of inhaling air intermittently.

  In the former, air and drainage are stagnant in the drainage pipe, and are emitted as if they flow like a uniform liquid. The drainage that flows into the reservoir is immediately sucked into the drainage pipe together with air, so the interior of the reservoir is almost empty. It becomes the state of.

  On the other hand, in the latter case, drainage once accumulates in the water reservoir, a siphon phenomenon occurs due to the water head pressure of the drainage, the drainage of the water reservoir is completely sucked, and then mainly air is sucked. When this air reaches a vertical pipe (or a pipe with a steep downward slope corresponding to this) that mainly generates suction force, the suction force disappears and drainage begins to accumulate again in the water reservoir, and the same process is repeated thereafter. It is. At the time when the air begins to be sucked from the drain, the suction force has not declined, and rainwater continues to gather in the water reservoir without interruption. As a result, a small amount of drainage is strongly drawn into the drain pipe. A loud sound is emitted periodically from the former.

  Which of these two types of drainage sound is generated depends on drainage pipe installation conditions, drainage flow rate, and the like. When the drainage flow rate changes, the two types of drainage sound change continuously.

  In any case, air and rainwater may be sucked into the drain at the same time, producing a loud noise, which is particularly problematic when the siphon drainage system is applied to a veranda facing a window in a living room.

  Many technologies have been disclosed as countermeasures for drainage noise, and in siphon drainage systems, methods for attenuating noise with a cover having a large number of water passages that also serve as dust removal have been introduced (for example, patent documents). 2). This cover is said to have a silencing effect whether single or double.

  Another method is to provide a silencer that is tuned to the frequency of sound in the middle of the pipe, and a silencer called a Helmfortz resonator is connected to the drain (for example, Patent Document 4). reference).

  Furthermore, a typical method of suppressing drainage noise is to make the inside of the pipe line communicate with the atmosphere through a ventilation pipe, etc., so that the inside of the pipe is brought close to atmospheric pressure and the sound itself caused by positive pressure and negative pressure is reduced. This is a method to avoid (see, for example, Patent Document 3).

JP2005-139659 JP2004-308399 JP 11-140936 JP2003-206556

  However, in order to obtain a high noise reduction effect even if it is attempted to reduce the noise only by the amount leaking from the water passage hole of the cover with the sound deadening structure of Patent Document 2, the diameter of the water passage hole is reduced, The total area is inevitably reduced, and the flow of drainage is deteriorated, and foreign substances are easily clogged.

  The method of providing a silencer in a part of a pipe line as in Patent Document 4 requires an installation space for the silencer and requires a connection work between the silencer and a drain pipe. When the silencer is concealed under the ceiling, wall, or floor, it is necessary to provide an inspection port for maintenance and inspection of the silencer.

  In addition, when the method of reducing noise by bringing the pressure in the pipe close to atmospheric pressure as in Patent Document 3 is applied to a siphon drainage system, air that is easier to move than drainage is given priority from the vent pipe during the siphon phenomenon. Will be aspirated. As a result, the suction amount of the waste water is reduced by the amount of the sucked air, and in the siphon phenomenon where air and waste water are mixed, the suction force itself is weakened, so the waste water flow rate per unit time is reduced. It becomes impossible to take advantage of the merits of the water drainage system (the suction action reduces the diameter of the drain pipe and reduces the number of drain pipes).

The object of the present invention is to obtain a silencing effect efficiently in accordance with the noise characteristics of the drainage, so that the number of water passage holes is not reduced (or reduced) more than necessary, space saving and easy maintenance, and siphon type It is an object of the present invention to provide a silencing structure and a silencing space component that do not impair the suction action of the drainage system.

In order to achieve the above object, a first drainage structure of the present invention comprises: a drainage port; a water reservoir part for temporarily storing water from the drainage port; and a drain pipe for guiding water from the water reservoir part downstream. A drainage structure that utilizes a siphon phenomenon, wherein the water reservoir is provided on the drain outlet side and has an upper surface plate formed with an upper water passage hole through which drainage passes, and the drainage pipe provided on the drain pipe side passes. The lower surface plate is formed with a lower surface water passage hole, and between the upper surface plate and the lower surface plate, the sound of a predetermined frequency band transmitted as noise from the drain pipe to the water reservoir when the siphon phenomenon occurs is attenuated. It is the drainage structure characterized by comprising the silencing space to perform.

The second drainage structure is characterized in that the upper surface water passage hole of the upper surface plate and the lower surface water passage hole of the lower surface plate are arranged so as to be shifted from each other so as not to be on the same vertical line. It is the drainage structure of description .

In the third drainage structure, the silencing space is formed inside a silencing space constituting member configured by the upper surface plate, the lower surface plate, and a body portion connecting the upper surface plate and the lower surface plate, The silencing space constituting member is a drainage structure according to the first or second drainage structure, which is detachable from the water reservoir .

The fourth drainage structure is the drainage structure according to any one of the first to third drainage structures, wherein a filtration member that prevents foreign matter from entering the silencing space is provided in the drainage port. .

In the fifth drainage structure, a plurality of the upper surface water passage holes and the lower surface water passage holes are provided, and the outlets of at least one water passage hole and the outlets of the other water passage holes are positioned in the vertical direction. The drainage structure according to any one of the first to fourth drainage structures, which is different .

In the sixth drainage structure, the upper surface plate is provided with an inlet above the upper surface water passage hole to allow passage of air as well as drainage, and the lower surface plate has the lower surface passage. A vent pipe is provided above the water hole to allow passage of air as well as drainage, and the vent pipe of the upper surface plate and the vent tube of the lower surface plate are provided on the same vertical line. The drainage structure according to any one of the first to fifth drainage structures .

In the seventh drainage structure, a plurality of the upper surface water passage holes and the lower surface water passage holes are provided, and at least one water passage is provided when the vertical positions of the outlets of the respective water passage holes are the same. The opening area of the inlet of the hole is configured to be larger than or equal to the opening area of the outlet, and the opening area of the outlet of the other water passage hole is configured to be larger than the opening area of the inlet. It is a drainage structure as described in any drainage structure .

The first silencing space constituting member is a drainage structure using a siphon phenomenon having a drainage port, a water reservoir portion for temporarily storing water from the drainage port, and a drain pipe for guiding water from the water reservoir portion downstream. A sound deadening space constituting member provided in the water reservoir portion of the water reservoir portion, provided on the drain outlet side of the water reservoir portion and having an upper surface water passage hole through which drainage passes, and a drain pipe of the water reservoir portion A lower surface plate that is provided on the side and has a lower surface water passage hole through which drainage passes, and a body portion that connects the upper surface plate and the lower surface plate, and is surrounded by the upper surface plate, the lower surface plate, and the body portion. And a silencing space component for attenuating sound of a predetermined frequency band transmitted as noise from the drain pipe to the water reservoir when the siphon phenomenon occurs .

The second silencing space constituting member is characterized in that the upper surface water passage hole of the upper surface plate and the lower surface water passage hole of the lower surface plate are shifted from each other so as not to be on the same vertical line. It is a muffling space structural member as described in a space structural member .

In the third silencing space constituting member, a plurality of the upper surface water holes and the lower surface water holes are respectively disposed, and the outlets of at least one water hole and the outlets of the other water holes are arranged in the vertical direction. It is a silencing space constituent member given in the 1st or 2nd characterized by a position differing .

In the fourth silencing space constituting member, the upper surface plate is provided with an inlet above the upper surface water passage hole so as to allow passage of air as well as drainage, and the lower surface plate has the above-mentioned A vent pipe is provided above the lower water passage hole to allow not only drainage but also air to pass through. The upper pipe and the lower pipe are arranged on the same vertical line. The silencing space constituent member according to any one of the first to fourth silencing space constituent members .

According to the above drainage structure, in the water reservoir of the siphon type drainage system, it is possible to effectively silence the silencing space corresponding to the frequency band of drainage noise, so there is no need to reduce the number and area of the water holes more than necessary. It is possible to secure a drainage flow rate equivalent to that when the silencing effect is not required. Further, it is possible to reduce the possibility of being clogged by the flowing foreign matter.

Further, the upper surface water passage hole and the lower surface water passage hole are arranged so as not to be on the same vertical line. Then, the sound generated from the drain pipe downstream of the water reservoir can be reflected and attenuated more in the silencing space, and the silencing effect can be further enhanced.

In addition, a silencing function can be easily added to the siphon drainage system by attaching a silencing space component to the water reservoir. It is also easy to take out and maintain. Furthermore, even when the frequency of the drainage noise to be dealt with is changed, the noise countermeasure is completed simply by replacing the noise-reducing space constituting member corresponding to this frequency.

In addition, a filter member that prevents foreign matter from entering the silencing space is provided at the drain port. By separating the foreign matter filtering function and the silencing function, it is possible to prevent the foreign matter from entering the silencing space and prevent the silencing effect from being deteriorated by the foreign matter.

In addition , the silencing effect can be exerted after the air inside or below the silencing space is efficiently removed without using a vent pipe. For this reason, the suction action by the siphon phenomenon can be used effectively, and the wastewater flow rate per unit time does not decrease.

In addition , it goes without saying that it is preferable if the filter member has a structure for efficiently removing air, but unlike the sound deadening structure that needs to prevent sound leakage, the filter member does not need to be improved in watertightness and airtightness. Usually, since the filtration area is wide so as not to be clogged, a special structure for evacuating air by replacing gas and liquid with an appropriate gap or water passage hole is not necessarily required.

According to the configuration as described above, by efficiently obtaining a silencing effect in accordance with the noise characteristics of the drainage, it is possible to save space and maintain easily without reducing (or reducing) the number of water passage holes more than necessary. Can provide a silencing structure and a silencing space component that do not impair the suction action of the siphon drainage system .

[First Embodiment]
A first embodiment of the present invention will be described. 1A is a cross-sectional view of the drainage structure of the first embodiment, FIG. 1B is a plan view of the upper surface plate and the lower surface plate of the sound deadening space constituting member, and FIG. 1C is the sound silencing performance in the first embodiment. FIG.

  As shown in FIG. 1 (a), the present embodiment is a rainwater drainage structure arranged on a waterproof surface of a relatively horizontal building such as a flat roof or a veranda, and drains rainwater using a small-diameter pipe of a siphon drainage system. ing. If the inside of the building is passed through a small-diameter pipe without using conventional dredging for rainwater drainage, the exterior of the building can be made clear.

  A slab 7 that supports a flat roof or a veranda of a building is provided with a waterproof surface 6 with a waterproof sheet, and a drain port 2 is provided for collecting and draining rain that has fallen on the waterproof surface 6. The drainage port 2 is provided with a filtration member 5 for preventing foreign substances from entering, and below that is provided a water reservoir 3 (inner diameter of about 50 mm) for obtaining a water head according to Patent Document 1. The members constituting the water reservoir 3 and the drain port 2 are made of hard vinyl chloride resin having excellent durability. The water reservoir 3 is connected to a cross-linked polyethylene drain pipe 4 having an inner diameter of 18 mm by a joint (not shown).

  The silencing member storage portion 3a below the drain port 1 and above the water reservoir 3 is provided with a silencing space constituting member 10 which is the third drainage structure of the present invention. A certain silencing space S is formed. Moreover, the filtration member 5 mentioned above is this invention 4 drainage structure.

(Detailed explanation of the silencer component)
The silencing space constituting member 10 will be described. As shown in the plan view of FIG. 1B, the upper surface plate 11 and the lower surface plate 12 constituting the sound deadening space constituting member 10 are respectively provided with φ9 water passage holes 11a and 12a, and vent pipes 11c and 12c having an inner diameter of 4 mm. Have. A cylindrical body is integrally formed below the upper surface plate 11 and above the lower surface plate 12. And as shown to Fig.1 (a), the trunk | drum internal diameter below the upper surface board 11 corresponds with the trunk | drum outer diameter above the lower surface board 12, and both members can be fitted. When the two members are fitted, a sound deadening space S is formed inside. Practically, the upper surface plate 11 and the lower surface plate 12 are not easily fitted using a screw or a hook-shaped protrusion (not shown).

  As described above, the water passage holes 11a of the upper surface plate 11 and the water passage holes 12a of the lower surface plate 12 are provided at four locations, but the upper surface plate is formed using the above-described screws or hook-shaped protrusions. 11. When the lower surface plate 12 is fitted, the water passage holes 11a of the upper surface plate 11 and the water passage holes 12a of the lower surface plate 12 are arranged so as not to be on the same vertical line, and the second drainage structure of the present invention It has become.

  The vent pipes 11c and 12c have a role of allowing the air in the silencing space S and the water reservoir 3 to escape upward when drainage flows down from the water holes 11a and 12a. As described above, when the siphon phenomenon occurs, the air is sucked to reduce the drainage flow rate. Therefore, in this embodiment, the ventilation pipe is shortened, and when the drainage flow rate is insufficient, the ventilation pipe is submerged and the air is submerged. I try not to smoke. However, when the siphon phenomenon does not occur, if the top of the vent pipe is submerged in the drainage that has been pushed to the drain port 2 at once, the air inside the silencing space S or the water reservoir 3 cannot be removed, and the siphon phenomenon Sometimes I can't wake up This is an example solved in the second embodiment described later.

  When the above silencing space constituting member 10 is inserted into the water reservoir 3 of FIG. 1A, the silencing space constituting member 10 is disposed in the silencing member storage portion 3a by the support protrusion 3b protruding from the inner surface of the water reservoir 3. become. That is, the water reservoir 3 is formed with a top plate 11 provided on the drain outlet 2 side and formed with a water passage hole 11a through which drainage passes, and a water passage hole 12a provided on the drain pipe 3 side and through which drainage passes. The sound deadening space S that is partitioned by the lower surface plate 12 and attenuates the sound in a predetermined frequency band is configured.

  When the noise reduction space S is provided in the upper part of the water reservoir 3, the drainage noise from the drain pipe 4 enters the noise reduction space S before exiting from the drain outlet 2. The silencing space S with a hole in the top and bottom has a specific resonance frequency due to its structure. For this reason, the energy of the drainage sound is reflected, interfered and attenuated when entering and leaving the silencing space S. This will be described in detail below.

  According to the measurement by the present inventor, it is clear that the drainage noise of the siphon drainage system is loud at a specific frequency, and the frequency is 315 to 400 Hz when the drain pipe inner diameter is 18 mm. When the silencer constituting member 10 of the present invention is not provided, the noise value is around 78 dB (A), which is very noisy.

  On the other hand, the noise value in the case of the first embodiment in which the silencer constituting member 10 is disposed is shown in FIG. In this figure, the noise value is measured when the distance between the upper surface plate 11 and the lower surface plate 12, that is, the height of the silencing space S is changed. The horizontal axis is the height of the silencing space S, and the vertical axis is the noise value. Indicates. From this figure, it can be seen that the noise value is minimized when the height of the silencing space S is about 40 to 60 mm. In other words, it can be seen that for the frequency 315 to 400 Hz, the silencing can be most effectively performed if the height of the silencing space S is about 40 to 60 mm.

  One of the reasons that the silencing effect is enhanced is that the water passage holes 11a of the upper surface plate 11 and the water passage holes 12a of the lower surface plate 12 are shifted from each other so as not to be on the same vertical line. Thereby, it is possible to reflect the noise from the drain pipe 4 inside the silencing space constituting member 10 and prevent it from coming directly upward. In addition, shifting the water passage holes also has a secondary effect of preventing the skewers, toothpicks, pine needles, thin branches, etc. that have passed through the filter member 5 from dropping to the drain pipe side.

  Further, the silencing space S exhibiting the silencing function is not formed with the water reservoir 3 but is formed inside the removable silencing space constituting member 10 in the silencing member storage portion 3a of the water reservoir 3. If it is detachable from the silencer housing 3a, it can be removed and cleaned from the silencer housing 3a during cleaning, so that foreign matters can be removed more reliably and stable silencing in the silence space S. Performance can be demonstrated. Further, the fact that the silencing space constituting member 10 is detachable also has an effect of facilitating the addition and change of the silencing effect to the water reservoir 3. For example, the silencing space constituting member 10 can be inserted from the drain port 2 as needed without adding a silencing function to all the drain ports. Further, when the sound deadening space constituting member 10 is improved, it is possible to replace only the sound deadening space constituting member 10 without any modification to the drain port 2 or the water reservoir 3.

  As shown in FIG. 1 (a), in the present embodiment, a filtering member 5 is disposed above the drain port 2. The presence of the filtering member 5 can prevent foreign matters from adhering to the interior of the silencing space S and the water passage holes 11a and 12a serving as the entrances and exits thereof, and thus a stable silencing effect can be expected.

[Second Embodiment]
A second embodiment of the present invention will be described. Fig.2 (a) is sectional drawing of the drainage structure of 2nd Embodiment. FIG. 2B is a plan view of the upper surface plate 21 and the lower surface plate 22 of the sound deadening space constituting member 20, and FIG. 2C is an explanatory view of the relationship between the water surface W covering the upper surface plate 21 and the water passage outlet. 2 (d) is a diagram of measuring the silencing performance in the second embodiment. The same configurations as those of the above-described embodiment are denoted by the same reference numerals as those described above, and description thereof is omitted.

  In the second embodiment, the fifth drainage structure of the present invention is applied in place of the vent pipe of the first embodiment. That is, the cylindrical portions 21a1 and 21b1 that change the positions of the outlets in the vertical direction are disposed in the water holes 21a and 21b of the top plate. Similarly, cylindrical portions 22a1 and 22b1 are disposed in the water passage holes 22a and 22b of the bottom plate. This will be described in detail below.

  If the vertical position of the water hole outlet is different, the distance Ha from the water surface W to the outlet of the water hole 21a even if the water holes 21a, 21b may be covered with drainage on the top plate 21 Therefore, the distance Hb to the outlet of the water passage hole 21b is different. Therefore, even if the water pressure at the outlet of the water passage hole 21a is different from that at the outlet of the water passage hole 21b, and the air is accumulated in the sound deadening space S, the drainage flows into the sound deadening space S from the high water pressure 21a at the outlet lower position. The air flows down, and instead the air is pushed upward from 21b where the outlet is high and the water pressure is low.

  Also in the water passage holes 22a and 22b of the lower surface plate 22, the drainage on the lower surface plate and the lower air are exchanged by the cylindrical portions 22a1 and 22b1 that change the vertical position of the outlet, so that the water is collected in the water reservoir 3. The head pressure required for the siphon phenomenon can be secured.

  Next, the function of the water holes 21b and 22b during the siphon phenomenon will be described. As described above, when the siphon phenomenon occurs, air that is more easily moved than waste water is sucked downstream with priority over waste water, so that the waste water flow rate per unit time decreases. If the amount of drainage collected at the drainage port 2 exceeds the reduced drainage flow rate, drainage that cannot be sucked up will accumulate above the upper surface plate 21 and the lower surface plate 22. However, if the drainage accumulates and the water surface rises, the upper ends of the water holes 21b and 22b are submerged, so that the wastewater is sucked in place of the air, and the water surface of the drainage is the upper end of the water holes 21b and 22b. It will not rise above.

  In this way, the water passage holes 21b and 22b that have discharged air before the occurrence of the siphon phenomenon are changed to applications for sucking the drainage accumulated above the upper surface plate 21 and the lower surface plate 22 during the siphon phenomenon. Therefore, all the waste water is treated under the filtering member 5 and does not accumulate on the waterproof surface 6. That is, in the technique of providing a vent pipe as typified by Patent Document 3, the upper end of the technique must always be in communication with the atmosphere in order to ensure smooth air inflow and out, and through the filter member, Will be extended. Otherwise, as shown in the first embodiment of the present invention, if the upper end of the vent pipe is submerged, good drainage may be hindered. However, in the fifth drainage structure of the present invention, even if submerged, the air and drainage can be replaced, and when the suction action due to the siphon phenomenon becomes weak, the suction action can be recovered by submerging. it can.

  In addition, as shown below, the cylindrical portions 21a1, 21b1, 22a1, and 22b1 disposed in the water passage holes in order to make the positions in the vertical direction of the water hole outlets different also have a role of enhancing the silencing effect.

  FIG. 2D shows a cylindrical portion (21a1, 21b1, 22a1, 22b1) disposed in the water passage hole with the diameter of the water passage hole (21a, 21b, 22a, 22b) being φ10 in the second embodiment. The noise value when the distance between the upper surface plate 21 and the lower surface plate 22 of the silencing space constituting member 20 is changed depending on whether the length of) is 15 mm or 30 mm is measured. As in FIG. 1C, the horizontal axis represents the distance between the upper surface plate and the lower surface plate, that is, the height of the silencing space S, and the vertical axis represents the noise value. Of the two curves in FIG. 2D, the upper curve is when the length of the cylindrical portion (21a1, 21b1, 22a1, 22b1) is 15 mm, and the lower curve is 30 mm.

  In the first embodiment and the second embodiment, the positions and diameters of the water passage holes (φ9 and φ10, respectively) are slightly different, but both of the height of the silencing space S are shown in FIGS. 1 (c) and 2 (d). It can be seen that the noise value is the smallest when the value is about 40 to 60 mm. Then, it can be seen that the noise value is smaller in the second embodiment than in the first embodiment without the cylindrical portion, and the noise value can be further reduced in the second embodiment having the cylindrical portion as the longer cylindrical portion.

  As described above, if there is a silencing space S corresponding to a predetermined noise frequency, the sound can be effectively silenced. Therefore, it is not necessary to reduce the number and area of the water passage holes more than necessary, and clogging is caused by the flowing foreign matter. The possibility can be reduced.

[Modification 1 of Second Embodiment]
Next, a modification of the second embodiment will be described. In 2nd Embodiment, although the upper surface board and the lower surface board had a some circular water flow hole, it does not restrict to this. Fig.3 (a) is an example of the upper surface board which comprises the muffling space structural member in the modification of 2nd Embodiment.

  As shown to Fig.3 (a), in the upper surface board 31 which comprises the silencing space structural member of a modification, the notch arrange | positioned at a side surface becomes a water flow hole. When two upper surface plates 31 and a lower surface plate having the same shape (not shown) are vertically stacked in the sound deadening member storage portion 3a, a sound deadening space S is formed therebetween.

  In the upper surface plate 31 of this modification, a water passage hole is formed by cutting a side surface. This modification also has two types of water passage holes. One is a water passage hole 31a that is isolated from the inner surface of the upper surface plate 31 by forming a side wall 31a1 on the inner surface. The other is a water passage hole 31b connected to the inner surface of the upper surface plate 31 because there is no side wall on the inner surface. Here, the position of the outlet opening of the water passage hole changes depending on the presence or absence of the side wall. That is, by inserting the upper surface plate 31 so as to be inscribed in the sound deadening member accommodating portion 3a, the outlet opening of the water passage hole 31a is lower than the outlet opening of the water passage hole 31b immediately below the top surface of the upper surface plate 31. It will be in.

  In the present modification, the number of water holes in the upper surface plate 31 is four, of which three are the water holes 31a and one are the water holes 31b.

  If the cutout on the side surface is used as a water hole as in this modification, it is possible to reduce the contact area between the upper surface plate 31 and the inner surface of the muffler member storage portion 3a. Since the contact area is smaller than that of the second embodiment, it is possible to prevent the component from adhering to the water reservoir due to the components contained in the wastewater even when the filter is attached for a long time. Then, it becomes easy to remove the top plate 31 from the sound deadening member storage 3a, and the cleaning workability is improved. Moreover, the stable silencing effect can be exhibited by performing a cleaning operation reliably.

  In the present modification, the top surface of the upper surface plate 31 is flat with no irregularities, so that the top surface can be cleaned very easily even if foreign matter that has passed through the filtering member adheres to the top surface. In addition, since the vertical position of the outlet opening of the water passage hole is changed as described above, the distance from the water surface to the outlet opening is different between the two kinds of water passage holes as in FIG. Thus, even when the entire upper surface plate 31 is covered with the drainage, the drainage flows down from the lower outlet opening 31a, and the air is pushed out from the water passage hole 31b instead.

  Since the drainage and air are replaced by the same mechanism on the bottom plate, which has the same structure, the water head necessary for the siphoning phenomenon can be secured in the water reservoir, and the siphoning phenomenon can be smoothly drained. Can do. Further, the use of the notch as a water hole prevents the adhering to the inner surface of the sound deadening member storage portion 3a and the point that the top surface is flat and has good cleanability are the same as described with the upper surface plate.

[Modification 2 of the second embodiment]
Another modification of the second embodiment will be described.

  In the second embodiment and Modification 1 thereof, the replacement of air and drainage is promoted by changing the vertical position of the plurality of water hole outlets on the upper surface plate or the lower surface plate. It is not limited to. 3 (b), which is the sixth drainage structure of the present invention, and FIG. 3 (c), a method for replacing air and drainage in the case where the vertical direction of each water hole outlet is the same is an example of a top plate. I will explain it. This replacement method is also effective for the bottom plate.

  As shown in FIGS. 3B and 3C, the upper surface plates 60 and 70 in the second modification have at least two types of water passage holes having different cross-sectional shapes. Specifically, the vertical position at the outlet of the hole is the same, but the diameter of the opening of the water passage hole is different between the inlet and the outlet.

  For example, as shown in FIG. 3B, the upper surface plate 60 is provided with a water passage hole 61a having an inlet diameter larger than the outlet diameter and a water passage hole 61b having an inlet diameter smaller than the outlet diameter. In the water passage hole 61a, since the diameter of the side wall inside the water passage hole gradually decreases from the inlet toward the outlet, the drainage easily follows the side wall and does not easily fall to the outlet. For this reason, the vertical drainage fall position R (here, the fall position is a position where the drainage does not flow down through the water passage side wall but falls freely from the water passage side wall; the same applies hereinafter). ) Is near the exit of the water passage hole 61a. On the other hand, in the water passage hole 61b, since the diameter of the side wall inside the water passage hole increases from the inlet toward the outlet, the drainage W is difficult to follow along the side wall, and the drainage W tends to fall away from the side wall. For this reason, the fall position R of the waste water is near the entrance of the water passage hole 61b.

  Thus, even if the vertical position of the outlet is the same, the falling position R of the drainage is changed by changing the cross-sectional shape of the water passage hole. 3B, the distance Ha from the water surface W to the drop position R is longer at the distance Ha at the water passage hole 61a than at the distance Hb at the water passage hole 61b. Accordingly, the water pressure in the water passage 61a is larger than the water pressure in the water passage 61b, and the drainage flows down from the water passage 61a having a larger water pressure, and the air flows upward from the water passage 61b instead. It will be pushed out. In this way, drainage accumulates in the water reservoir 3, and the water head pressure necessary for the occurrence of the siphon phenomenon can be secured.

  Further, as shown in FIG. 3C, the upper surface plate 70 is provided with a water passage hole 71a having substantially the same diameter at the inlet and the outlet and a water passage hole 71b having an inlet diameter smaller than the outlet diameter. Also in this case, the fall position R of drainage at the water passage hole 71a is near the outlet, and the fall position R of drainage at the water passage hole 71b is near the inlet. As a result, as described above, the drainage flows down from the water passage hole 71a having a high water pressure, and air is pushed upward from the water passage hole 71b instead. Then, drainage accumulates in the water reservoir 3, and the water head pressure necessary for the occurrence of the siphon phenomenon can be secured.

[Third Embodiment]
A third embodiment of the present invention will be described with reference to FIG. Fig.4 (a) is sectional drawing of the drainage structure of 3rd Embodiment. The same configurations as those of the above-described embodiment are denoted by the same reference numerals as those described above, and description thereof is omitted. 4 (b) is a horizontal sectional view of the upper surface plate 41 and the lower surface plate 42 accommodated in the body portion 43, and FIG. 4 (c) is a state in which rainwater has accumulated on the waterproof surface 6 and the body portion 43 is pulled out upward. FIG. 4 (d) is a plan view and a side view of the upper surface plate 41 and the lower surface plate 42, with the upper surface plate 41 and the lower surface plate 42 removed.

  In FIG. 4A, the silencing space S is composed of three members, an upper surface plate 41, a lower surface plate 42, and a body portion 43, and the positions of the upper surface plate 41 and the lower surface plate 42 are on the inner surface of the body portion 43. It is determined by the flat protrusions provided and the cutouts of the peripheral edges of the corresponding upper surface plate 41 and lower surface plate. The body portion 43 is longer than the distance between the upper surface of the water reservoir 3 and the upper surface plate 41 and the lower surface plate 42 from the water surface W that can collect on the waterproof surface.

  With such a configuration, for example, when foreign matter is clogged in the filter member 5 and rainwater accumulates on the waterproof surface 6, the filter member 5 is removed and the body 43 is lifted with a handle (not shown) as shown in FIG. If it is in the state of c), it can prevent that a foreign material flows into the small diameter drain pipe 4 via a water reservoir part with rain water. Also, in the state where rainwater has accumulated on the waterproof surface 6, even if foreign matter that has flown with the rainwater is caught on the upper surface plate 41 or the lower surface plate 42 until the trunk portion 43 is pulled up, If the face plate 41 and the lower face plate 42 are removed, the removal is easy.

  Also in the present embodiment, the effect of the silencing space S constituted by the upper surface plate 41, the lower surface plate 42, and the body portion 43, the upper surface plate 41 and the lower surface plate 42 which are arranged so as not to be on the same vertical line. Arrangement of the water passage holes, arrangement of the filtering member 5 provided in the drainage port 2 for preventing the entry of foreign matter into the silencing space S, and cylindrical portions 41a1, 42a1, which make the vertical positions of the outlets of the water passage holes different, The effect of is the same as in the other embodiments.

[Fourth Embodiment]
A fourth embodiment of the present invention will be described with reference to FIG. Fig.5 (a) is sectional drawing of the drainage structure of 4th Embodiment, and is provided with the 1st-5th characteristic of this invention. The same configurations as those of the above-described embodiment are denoted by the same reference numerals as those described above, and description thereof is omitted. FIG. 5B is a perspective view of the silencing space constituting member 50 housed in the silencing member housing portion 3a.

  In the present embodiment, the water passage holes 51a and 52a are opened toward the side surface of the sound deadening member storage portion 3a. With such a configuration, most of the noise generated by the drain pipe is reflected and attenuated not only in the silencing space S but also on the side surface of the silencing member storage part 3a. It can be made even smaller.

  [Other Embodiments]

  In the above embodiment, the number of the water passage holes of the sound deadening space constituting member is four. However, the number is not limited to this, and the number may be any number. Even in this case, the silencing performance can be further improved by preventing the water passage holes provided in the upper surface plate and the water passage holes provided in the lower surface plate from being on the same vertical line. it can.

INDUSTRIAL APPLICABILITY The present invention can be used for a drainage structure having a silencing structure and a silencing space constituent member .

(A) Sectional drawing of the drainage structure of 1st Embodiment. (B) The top view of the upper surface board and lower surface board of a noise reduction space structural member. (C) The figure which measured the silencing performance in 1st Embodiment. (A) Sectional drawing of the drainage structure of 2nd Embodiment. (B) The top view of the upper surface board and lower surface board of a noise reduction space structural member. (C) Explanatory drawing of the relationship between the water surface which covered the upper surface board, and the water flow hole exit. (D) The figure which measured the muffling performance in 2nd Embodiment. (A) The figure of an example of the upper surface board which comprises the muffling space structural member in the modification 1 of 2nd Embodiment. (B) Explanatory drawing of the relationship between the water surface which covered the upper surface board which comprises the muffling space structural member in the modification 2 of 2nd Embodiment, and the fall position of waste_water | drain. (C) Explanatory drawing of the relationship between the water surface which covered the upper surface board which comprises the muffling space structural member in the modification 2 of 2nd Embodiment, and the fall position of waste_water | drain. (A) Sectional drawing of the drainage structure of 3rd Embodiment. (B) The horizontal sectional view of the upper surface board and lower surface board which are stored in the trunk | drum. (C) The figure of the state which pulled out the trunk | drum upwards and the upper surface board and the lower surface board were removed in the state which rainwater collected on the waterproof surface. (D) The top view and the side view of the upper surface plate 41 and the lower surface plate. (A) Sectional drawing of the drainage structure of 4th Embodiment. (B) The perspective view of a silencer space structural member.

S ... Silent space, R ... Falling position, W ... Water surface, 2 ... Drainage port, 3 ... Water reservoir, 3a ... Silencer housing, 3b ... Support projection, 4 ... Drain pipe, 5 ... Filtration member, 6 ... Waterproof surface , 7 ... Slab,
10 ... Silencer component, 11 ... Top plate, 11a ... Water vent, 11c ... Vent pipe, 12 ... Bottom plate, 12a ... Water vent, 12c ... Vent pipe,
20 ... Silencing space component, 21 ... Top plate, 21a ... Water passage hole, 21a1 ... Cylindrical portion, 21b ... Water passage hole, 21b1 ... Cylindrical portion, 22 ... Bottom plate, 22a ... Water passage hole, 22a1 ... Tube Shaped part, 22b ... water passage hole, 22b1 ... cylindrical part,
31 ... Top plate, 31a ... Water hole, 31a1 ... Side wall, 31b ... Water hole, 31d ... Body
40 ... Silencer component, 41 ... Top plate, 41a ... Water passage hole, 41a1 ... Tubular portion, 41b ... Water passage hole, 42 ... Bottom plate, 42a ... Water passage hole, 42a1 ... Tubular portion, 42b ... passage Water hole, 43 ... trunk,
50 ... Silent space component, 51 ... Top plate, 51a ... Water hole, 51b ... Water hole, 52 ... Bottom plate, 52a ... Water hole, 52b ... Water hole,
60 ... Top plate, 61a ... Water hole, 61b ... Water hole, 70 ... Top plate, 71a ... Water hole, 71b ... Water hole

Claims (11)

A drainage structure using a siphon phenomenon having a drainage port, a water reservoir portion that temporarily stores water from the drainage port, and a drain pipe that guides water from the water reservoir portion downstream,
The water reservoir,
An upper surface plate provided on the drain port side and having an upper surface water passage hole through which drainage passes;
Partitioned with a bottom plate provided on the drain pipe side and formed with a bottom water passage hole through which drainage passes,
A drainage structure characterized in that a silencing space is formed between the upper surface plate and the lower surface plate to attenuate sound of a predetermined frequency band transmitted as noise from the drain pipe to the water reservoir when the siphon phenomenon occurs . The drainage structure according to claim 1, wherein the upper surface water passage hole of the upper surface plate and the lower surface water passage hole of the lower surface plate are arranged so as not to be on the same vertical line. The silencing space, said upper plate, said lower plate, said by the barrel portion connecting the upper surface plate and the said lower plate is formed inside the formed silencing space component, it said muffling space structure member, The drainage structure according to claim 1 , wherein the drainage structure is detachable from the water reservoir. The drainage structure according to any one of claims 1 to 3, wherein a filtering member that prevents foreign matter from entering the silencing space is provided at the drainage port. A plurality of the upper surface water holes and the lower surface water holes are respectively disposed,
The drainage structure according to any one of claims 1 to 4, wherein the vertical position of the outlet of at least one water passage hole and the outlet of another water passage hole is different. The upper surface plate is provided with an inlet provided above the upper surface water passage hole to allow not only drainage but also air to pass therethrough, and the lower surface plate has an inlet above the lower surface water passage hole. A vent pipe that allows not only drainage but also air to pass through is provided,
The upper surface plate and the lower surface plate are provided on the same vertical line.
The drainage structure according to any one of claims 1 to 5, wherein In the case where a plurality of the upper surface water holes and the lower surface water holes are respectively disposed and the vertical positions of the outlets of the respective water holes are the same,
The opening area of the inlet of at least one water hole is configured to be greater than or equal to the opening area of the outlet, and the opening area of the outlet of the other water hole is configured to be larger than the opening area of the inlet. The drainage structure according to any one of claims 1 to 4. A muffler provided in the water reservoir of a drainage structure using a siphon phenomenon having a drain, a water reservoir for temporarily storing water in the water drain, and a drain pipe for guiding water from the water reservoir downstream. A space component,
An upper surface plate that is provided on the drain outlet side of the water reservoir and has an upper surface water passage hole through which drainage passes;
A lower surface plate provided on the drain pipe side of the water reservoir portion and formed with a lower surface water passage hole through which drainage passes;
While comprising a body portion that connects the upper surface plate and the lower surface plate,
Surrounded by the upper surface plate, the lower surface plate, and the body portion, a silencing space for attenuating sound in a predetermined frequency band transmitted as noise from the drain pipe to the water reservoir portion when the siphon phenomenon occurs is provided.
A muffler space component characterized by that . The upper surface water hole of the upper surface plate and the lower surface water hole of the lower surface plate are arranged so as not to be on the same vertical line.
The muffler space constituting member according to claim 8 . A plurality of the upper surface water holes and the lower surface water holes are respectively disposed,
The vertical position of the outlet of at least one water hole and the outlet of the other water hole are different.
The muffler space constituting member according to claim 8 or 9, characterized in that . The upper surface plate is provided with an inlet provided above the upper surface water passage hole to allow not only drainage but also air to pass therethrough, and the lower surface plate has an inlet above the lower surface water passage hole. A vent pipe that allows not only drainage but also air to pass through is provided,
The upper surface plate and the lower surface plate are provided on the same vertical line.
The muffler space constituting member according to any one of claims 8 to 10, wherein