JP2011169052A - Drain trap and drainage structure of unit bath - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drain trap and a drainage structure of a unit bath, capable of enhancing water sealing strength. <P>SOLUTION: The drain trap includes: an inflow section including an inflow-side connecting pipe 56 or the like to which drainage inflows; an outflow section 64 from which the drainage outflows; a storage space 75 provided between the inflow section an the outflow section 64; and an expansion/contraction chamber 74 communicating with the outflow section 64 and expanding/contracting by pneumatic pressure. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a drain trap and a drain structure of a unit bath.

  Conventionally, a water-sealed drain trap is provided in a water drain structure such as a unit bath or a basin in order to store sealed water and block odor from a drain pipe (Patent Document 1). reference). This drain trap is used to break the water when the negative pressure in the drain pipe becomes excessively negative, and to generate noise, etc., and when the pressure inside the drain pipe becomes excessively positive, the drain traps around the water A phenomenon that water is wiped off may occur.

  For this reason, the water-sealed drain trap needs to have a certain level of sealing strength. In addition, sealing water strength means the sealing water retention capability of a drain trap when a positive pressure or a negative pressure is generated in a drain pipe. The positive pressure means a pressure higher than the atmospheric pressure, and the negative pressure means a pressure lower than the atmospheric pressure.

  Currently, in Japan, the sealing strength of drain traps is determined by a structural rule called sealing depth (sealing depth). Specifically, in the SHASE-S218 standard and the Building Standards Act notification (Ministry of Construction Notification No. 1674), there is a structural rule that the sealed water depth is 50 mm to 100 mm.

  However, if the sealing depth is simply increased, the sealing strength increases, but dirt accumulates in the drain trap, resulting in a decrease in performance and a deterioration in maintainability. In addition, low-level drainage appliances such as unit baths are required to reduce the floor of the appliance itself in order to reduce the space under the floor, but increasing the sealing depth is a bottleneck for lowering the floor. Yes.

Furthermore, the sealing strength of the drain trap is determined not only by the sealing depth but also by various factors.
For example, by increasing the ratio of the cross-sectional area of the inflow side pipe and the cross-sectional area of the outflow side pipe (leg cross-sectional area ratio), that is, by making the cross-sectional area of the inflow side pipe of the trap larger than the cross-sectional area of the outflow side pipe, Sealing strength can be increased.

  However, because the leg cross-sectional area ratio is not a numerical value stipulated by laws or standards, drain traps with a leg cross-section ratio of 0.8 or less are sometimes found in currently sold drain traps. The Further, when the leg cross-sectional area ratio is extremely increased, the maintainability is deteriorated.

  Furthermore, even if the leg cross-sectional area ratio is the same, the sealing water strength varies depending on the structure of the drain trap (P trap, S trap, reverse trap, etc.). Specifically, when comparing a P trap and an S trap that have the same shape to form a sealed water part, the P trap has a mechanism in which some of the water once pulled outside the P trap returns to the P trap. However, in the case of the S trap, the water sealing strength is not constant, for example, water once pulled out of the S trap does not return to the S trap.

  As described above, since there is a limit to increasing the sealing strength of the drain trap by adjusting the sealing depth and leg cross-sectional area ratio, it is desired to increase the sealing strength of the drain trap by a method other than the above.

  Therefore, in Patent Document 2, when the drainage facility becomes positive pressure, the air in the drainage facility flows into the flexible air reservoir and the positive pressure is increased by inflating the flexible air reservoir. A damped pressure damping device is disclosed.

Japanese Utility Model Publication No. 6-20568 Japanese Patent No. 4295616

  However, Patent Document 2 does not describe providing a pressure damping device in the drain trap. Even if a pressure attenuation device is provided in a drainage structure, for example, a vertical pipe, the positive pressure in the vicinity of the drain trap cannot be sufficiently attenuated, so that the sealing strength of the drain trap cannot be increased. Thus, if the positive pressure near the drain trap cannot be attenuated, drainage of the drainage occurs at the drain trap portion.

  In view of the above-described facts, an object of the present invention is to provide a drain trap and a unit bath drain structure capable of increasing the sealing strength.

  The drain trap according to the first aspect of the present invention includes an inflow portion into which drainage flows, an outflow portion from which the drainage flows out, a water-sealed sealing portion provided between the inflow portion and the outflow portion, And an expansion / contraction chamber that communicates with the outflow portion and expands / contracts by air pressure.

According to this configuration, even when the outflow portion is in a positive pressure state, the air in the outflow portion flows into the expansion / contraction chamber, and the expansion / contraction chamber is expanded by the air pressure. Thereby, since the air in an outflow part flows into an expansion / contraction chamber, it can absorb a positive pressure and can suppress that a positive pressure acts on a sealing part.
If the action of positive pressure on the sealed water portion is suppressed, the phenomenon that the sealed water is wiped off from the inflow portion does not occur, and the sealing strength of the drain trap can be increased.
Further, when the outflow portion changes from the positive pressure state to the negative pressure state, the air in the expansion / contraction chamber flows into the outflow portion, and the expanded expansion / contraction chamber contracts and returns to the original state. Thereby, even when it becomes a positive pressure again after becoming a negative pressure, the air in an outflow part can be flowed in an expansion / contraction chamber.

The drain trap according to the second aspect of the present invention has an air vent pipe having one end communicating with the outflow portion and the other end communicating with the expansion / contraction chamber.
Thus, the outflow portion and the expansion / contraction chamber can be communicated with each other via the air vent pipe.

In the drain trap according to the third aspect of the present invention, the other end portion of the air vent pipe extends upward.
In this way, by extending the other end of the air vent pipe upward, it is possible to suppress drainage in the outflow portion from flowing into the air vent pipe.

In the drain trap according to the fourth aspect of the present invention, the other end of the air vent pipe is arranged in the vertical direction.
According to this configuration, the positive pressure of the outflow portion can be effectively absorbed by arranging the other end portion side of the air vent pipe, that is, the connection side of the air vent pipe with the expansion / contraction chamber in the vertical direction.

In the drain trap according to the fifth aspect of the present invention, the air vent pipe has the one end communicating with the upper part of the outflow portion.
Thus, the inflow of the waste_water | drain to an air vent pipe can be suppressed by making the one end part of an air vent pipe communicate with the upper part of an outflow part.

The drain trap concerning the 6th mode of the present invention is provided in the outflow part, and is provided with the vent valve which flows the air from the outside into the outflow part.
According to this configuration, it is possible to prevent breakage due to negative pressure in the outflow portion, drainage noise associated therewith, and the like.

In the drain trap according to the seventh aspect of the present invention, the expansion / contraction chamber is constituted by a bag.
Thus, by constituting the expansion / contraction chamber with a bag, the expansion / contraction chamber can be formed in a small space with a simple configuration.

A drainage structure for a unit bath according to an eighth aspect of the present invention includes a drainage port provided in a unit bath and the drainage trap described above provided between the drainage port and a floor surface of the unit bath and a floor slab. And having.
According to this configuration, since the sealing strength of the drain trap can be increased by providing the expansion / contraction chamber, there is no problem even if the sealing depth is shallow. Therefore, the depth of sealing of the drain trap between the floor surface of the unit bath and the floor slab is made shallow, and the height direction dimension from the floor slab surface to the floor surface of the unit bath (hereinafter referred to as the dimension under the floor) is set. Can be small.

A drain structure of a unit bath according to a ninth aspect of the present invention includes a horizontal pulling pipe that communicates with an outflow portion of the drain trap and extends in a lateral direction, and flows the drainage from the drain trap in a lateral direction, and the horizontal pull pipe And a soot pipe that extends downward and communicates with the pipe to generate siphon force by allowing the drainage from the horizontal pipe to flow down.
In conventional drainage, even if the sealing depth is shallow, if the pipes after the drain trap are long, the unit bath must be raised, whereas the siphon drainage structure as in the ninth aspect needs to be raised. Since there is no such thing, the significance of shallowing the sealing water comes out.

  As described above, according to the present invention, it is possible to provide a drainage trap and a drainage structure for a unit bath that can increase the sealing strength.

It is a fragmentary sectional view which shows roughly the partial structure of the drainage structure of the unit bath which concerns on 1st Embodiment of this invention. It is a perspective view of the principal part of a unit bus. It is sectional drawing which shows roughly the main-body part of the drain trap which concerns on 1st Embodiment of this invention. It is the schematic explaining the operation | movement of the expansion / contraction chamber which concerns on 1st Embodiment of this invention. It is the schematic which shows the main-body part of the drain trap which concerns on 2nd Embodiment of this invention. It is the schematic which shows the main-body part of the drain trap which concerns on 3rd Embodiment of this invention. It is the schematic which shows the main-body part of the drain trap which concerns on 4th Embodiment of this invention. It is a modification of the drain trap which concerns on 1st Embodiment-4th Embodiment of this invention. It is the schematic of the modification of the formation member of the expansion / contraction chamber which concerns on 1st Embodiment of this invention. It is the schematic of the other modification of the formation member of the expansion / contraction chamber which concerns on 1st Embodiment of this invention. It is the schematic of the modification of the vent valve which concerns on 1st Embodiment of this invention. It is the schematic which shows a siphon drainage structure.

[First Embodiment]
-Unit bath drainage structure-
Below, 1st Embodiment of the drainage structure of the unit bath of this invention is described based on drawing.

  FIG. 1 is a partial cross-sectional view schematically showing a partial configuration of a drainage structure 12 of a unit bath 10 according to the first embodiment of the present invention, and FIG. 2 is a perspective view of a main part of the unit bus 10.

The unit bath 10 is provided with a bathroom waterproof pan 30 as a floor surface of the unit bath 10 via a support member (not shown) on the floor slab 14.
A bathtub 32 as a container for storing hot water for bathing is disposed on one side of the upper part of the bathroom waterproof pan 30, and a portion other than the bathtub 32 of the bathroom waterproof pan 30 is provided with a washing place 34 for washing the body. It has become. The unit bath having a structure in which the bathtub 32 is disposed on the upper part of the bathroom waterproof pan 30 may be referred to as a full-pan structure unit bath.

The bathtub 32 is provided with a drain port 36 for discharging hot water stored in the bathtub 32 and can be closed with a plug 38.
The bathroom waterproof pan 30 is provided with a drain port 40 for discharging hot water or the like from the drain port 36 below the drain port 36. An eye plate 42 is attached to the drain port 40.

Below the eye plate 42, a water-sealed drain trap 46 according to the first embodiment of the present invention is provided.
The drain trap 46 includes a bathtub drain pipe 44 connected to the drain port 40. A drain trap body 50 is connected to the downstream end of the bathtub drain pipe 44.

  The drain trap body 50 is provided between the bathroom waterproof pan 30 and the floor slab 14 of the unit bath 10.

−Drain trap configuration−
FIG. 3 is a cross-sectional view schematically showing a main body portion of the drain trap according to the first embodiment of the present invention.
The drain trap body 50 includes an outer cylinder 54 disposed under the waterproofing pan 30 for bathroom. The outer peripheral wall 54A of the outer cylinder 54 is formed with an inflow side connection pipe 56 to which the bathtub drain pipe 44 is connected as an inflow part. The upper part of the drainage port 58 of the inflow side connection pipe 56 is partitioned by an outer peripheral wall 54A to ensure a sealing depth on the bathtub side.

In addition, an outflow portion 64 from which drainage flows out from the outer tube 54 is formed on the outer peripheral portion of the outer tube 54, and an outflow side connection pipe 66 connected to the outflow portion 64 is connected to the drainage pipe 52.
A vent valve 68 is formed in the outflow side connection pipe 66. The vent valve 68 is configured to have a check valve function that allows air to flow into the outflow portion 64 from the outside and prevents air and drainage from passing through the outflow portion 64 to the outside. As the vent valve 68, a check valve constituted by various mechanical elements such as an elastic body such as a membrane valve or a ball check valve can be used. In the present embodiment, the vent valve 68 is provided with a check valve (not shown) that is normally closed and opened when the outflow portion 64 becomes negative pressure.

The outflow portion 64 is connected to an air vent pipe 70 that extends laterally under the waterproofing pan 30 for bathroom. A bag body 72 is fixed to the exhaust port 70A of the air vent pipe 70, and air enters and exits from the exhaust port 70A.
The bag body 72 can be made of an elastic material that can be expanded and contracted, and as the material, for example, rubber, vinyl, or an elastomer other than rubber can be used. An expansion / contraction chamber 74 is formed inside the bag body 72.

  The expansion / contraction chamber 74 communicates with the outflow portion 64 through the air vent pipe 70 to be a sealed space in which the room can be expanded / contracted by air pressure, and the air in the pressed outflow portion 64 can flow in. Such an expansion / contraction chamber 74 expands when air flows into the interior, and contracts when air flows out of the interior.

  Further, an inner cylinder 76 is inserted into the outer cylinder 54 from the bathroom waterproof pan 30 side so as to form an annular storage space 75 inside the outer cylinder 54. A communication part 78 through which drainage flows between the outer cylinder 54 and the inner cylinder 76 is formed between the lower end part of the inner cylinder 76 and the bottom part 54 </ b> B of the outer cylinder 54. That is, by collecting drainage in the outer cylinder 54 or the bathtub drain pipe 44 until it flows out from the upper part of the outer peripheral wall 54 </ b> A of the outer cylinder 54, the bathtub drain pipe 44 and the drain pipe 52 are sealed and transmitted through the drain pipe 52. The odor does not reach the drain port 40. The height h from the lower end of the inner cylinder 76 to the upper end of the outer cylinder 54 is the sealing depth.

  Moreover, the upper part of the inner cylinder 76 is covered with the eye plate lid 82 which fits into the recessed part 80 formed in the waterproofing pan 30 for bathrooms, and while preventing the mixing of a foreign material, the hot water used when washing the body, the bathtub 32 The hot water or the like overflowing from the water can be drained from the eye plate lid 82 to the inner cylinder 76.

-Action-
Next, the operation of the drainage structure 12 and the drainage trap 46 of the unit bath 10 according to the first embodiment of the present invention will be described.

  In the drainage structure 12 of the unit bath 10 according to the first embodiment, the drainage from the bathtub 32 is discharged from the drainage port 36 of the bathtub 32 and flows into the drainage trap 46 through the drainage port 40. That is, the wastewater flows into the inflow side connection pipe 56 of the drainage trap body 50 from the drainage port 40 through the bathtub drainage pipe 44 as an inflow portion and flows to the communication portion 78. Then, the waste water overflowing from the upper end of the outer cylinder 54 via the communication part 78 flows into the drain pipe 52 via the outflow part 64 and the outflow side connection pipe 66 and is discharged from the unit bath 10.

  On the other hand, the waste water from the washing place 34 flows from the recess 80 of the washing place 34 into the opening portion of the inner cylinder 76 as the inflow portion of the drain trap body 50 and flows to the communication portion 78. Then, the waste water overflowing from the upper end of the outer cylinder 54 via the communication part 78 flows into the drain pipe 52 via the outflow part 64 and the outflow side connection pipe 66 and is discharged from the unit bath 10.

  Here, when the inside of the outflow part 64 is atmospheric pressure or negative pressure, the bag body 72 of the drain trap body 50 is in a flattened state as shown in FIG. However, when the inside of the outflow part 64 becomes a positive pressure, the air in the outflow part 64 flows into the expansion / contraction chamber 74, and as shown in FIG. The expansion / contraction chamber 74 is enlarged. Thereby, the positive pressure in the outflow part 64 can be absorbed, and it can suppress that a positive pressure acts on the sealing water in the storage space 75 by it.

If the action of positive pressure on the sealed water in the storage space 75 is suppressed, the drainage surface of the outer cylinder 54 is lowered, and the phenomenon that the sealed water is wiped off from the inflow portion such as the drainage pipe 44 for the bathtub does not occur. The sealing strength of the main body 50 can be increased.
When the inside of the outflow portion 64 changes from positive pressure to negative pressure, the air in the expansion / contraction chamber 74 flows into the outflow portion 64, and the expanded expansion / contraction chamber 74 is reduced as shown in FIG. Return to the original state. Thereby, even when it becomes a positive pressure again after becoming a negative pressure, the air in the outflow part 64 can be flowed in the expansion / contraction chamber 74.

  Furthermore, even when negative pressure continues after the bag body 72 shrinks and returns to its original state, air flows in from the vent valve 68 and the inside of the outflow portion 64 is less likely to become negative pressure. The same applies when the inside of the outflow portion 64 is changed from the atmospheric pressure state to the negative pressure. Therefore, it is possible to prevent breakage due to the outflow portion 64 becoming negative pressure and the accompanying drainage noise, and the sealing strength of the drain trap body 50 can be increased.

Furthermore, in the drainage structure 12 of the unit bath 10 according to the first embodiment, since the sealing strength of the drain trap body 50 can be increased by providing the expansion / contraction chamber 74, there is no problem even if the sealing depth is shallow. Absent.
Here, the sealing depth of the drain trap body 50 is a height h from the lower end of the inner cylinder 76 to the upper end of the outer cylinder 54 (see FIG. 3). However, by providing the expansion / contraction chamber 74, While maintaining the same sealing strength, it is shallower than the sealing depth of the drain trap, for example, the conventional sealing depth of 50 mm can be set to less than 50 mm.
Therefore, the sealing depth of the drain trap body 50 between the bathroom waterproof pan 30 of the unit bath 10 and the floor slab 14 can be reduced, and the size of the unit bath 10 under the floor can be reduced.

Moreover, since the air vent pipe 70 that connects the bag body 72 and the outflow portion 64 extends in the horizontal direction, it is possible to suppress an increase in the size under the floor when the bag body 72 is provided in the drain trap body 50. be able to.
Furthermore, since the one end part of the air vent pipe 70 communicates with the upper part of the outflow part 64, the inflow of the waste water to the air vent pipe 70 can be suppressed.

[Second Embodiment]
Next, a drain trap according to a second embodiment of the present invention will be described with reference to FIG.
FIG. 5 is a schematic view showing the main body of the drain trap according to the second embodiment of the present invention.

The main body of the drain trap 100 according to the second embodiment is different from the drain trap main body 50 of the first embodiment in the configuration of the air vent pipe.
That is, the air vent tube 102 of the drain trap 100 according to the second embodiment is formed in an L shape with a bent middle portion, and has a lateral tube 102A extending laterally from the outflow portion, and upward from the lateral tube 102A. The vertical pipe 102B extends. One end of the air vent tube 102 communicates with the outflow portion 64 and the other end communicates with the expansion / contraction chamber 74. In the configuration of the second embodiment, the other end is disposed in the vertical direction.

  According to the configuration of the drain trap 100 according to the second embodiment of the present invention, by arranging the other end portion side of the air vent pipe 102, that is, the connection side of the air vent pipe 102 with the expansion / contraction chamber 74 in the vertical direction, The positive pressure of the outflow part 64 can be absorbed effectively.

[Third Embodiment]
Next, a drain trap according to a third embodiment of the present invention will be described with reference to FIG.
FIG. 6 is a schematic view showing a main body of a drain trap according to the third embodiment of the present invention.

The main body portion of the drain trap 110 according to the third embodiment differs from the drain trap main body 50 of the first embodiment in the connection method between the bag body and the outflow portion.
That is, the bag body 112 of the drain trap 110 according to the third embodiment is directly connected to the outflow portion 64 without an air vent pipe.

  According to the configuration of the drain trap 110 according to the third embodiment of the present invention, since the bag body 112 is directly connected to the outflow portion 64, the air vent pipe 70 is not necessary as compared with the configuration of the first embodiment, and the parts It is possible to increase the sealing strength of the drain trap 110 while reducing the number of points.

[Fourth Embodiment]
Next, a drain trap according to a fourth embodiment of the present invention will be described with reference to FIG.
FIG. 7 is a schematic view showing a main body portion of a drain trap according to the fourth embodiment of the present invention.

The main body of the drain trap 120 according to the fourth embodiment is different in the configuration of the bag body from the drain trap main body 50 of the first embodiment.
That is, the bag body 122 of the drain trap 120 according to the fourth embodiment is directly attached to the outflow portion 64 and attached to the trap body so as to cover the trap body of the drain trap 120. The bag body 122 can also be regarded as a housing for the drain trap 120.

  According to the configuration of the drain trap 120 according to the fourth embodiment of the present invention, since the bag body 122 is attached to the trap body so as to cover the trap body of the drain trap 120, it is easy to ensure a bulging space, It becomes possible to absorb positive pressure more. Further, since the bag body 122 communicates directly with the outflow portion 64, the air vent pipe 70 is not required as compared with the configuration of the first embodiment, and the sealing strength of the drain trap 120 is increased while reducing the number of parts. It becomes possible.

[Other variations]
The present invention is not limited to the above-described embodiment, and various modifications, changes, and improvements can be made.

  For example, as a watering device to which the drain trap 46 according to the first embodiment of the present invention is applied, the case where it is constituted by the unit bath 10 has been described. However, such as a wash basin, a washing machine, a kitchen sink and a toilet, etc. You may be comprised by either.

In the first embodiment, the drain trap 46 is a reverse trap, but a trap structure as shown in FIG. 8 may be adopted as the drain trap of the present invention. Even in such a case, the bag body 72 is connected to the outflow portion 64 on the downstream side of the drain trap.
8A is a partial cross-sectional view of the P trap, and FIG. 8B is a partial cross-sectional view of the S trap. 8C is a partial cross-sectional view of the U trap, and FIG. 8D is a partial cross-sectional view of the heel trap. 8E is a partial cross-sectional view of the bottle trap, and FIG. 8F is a partial cross-sectional view of the drum trap.
Similarly, other traps can be used in the second to fourth embodiments.

  Further, the horizontal tube 102B of the air vent tube 102 of the second embodiment does not need to extend in the vertical direction, and may be slightly inclined.

  Moreover, although the case where the bag body 72 is a separate body from the trap body has been described, the housing of the trap body itself may be configured by the bag body 72. In particular, the housing of the outflow portion 64 only needs to be formed of a bag.

  The forming member for forming the expansion / contraction chamber 74 is not limited to the bag body 72, and various members can be used. For example, as shown in FIG. 9, the piston 130 </ b> A may be constituted by a cylindrical member 130 provided so as to be reciprocally movable in the cylinder 130 </ b> B. In this configuration, the expansion / contraction chamber 74 formed inside the cylinder 130B expands / contracts when the piston 130A reciprocates. That is, when air flows into the cylinder 130B, as shown in FIG. 9B, the piston 130A is pushed up, the expansion / contraction chamber 74 is expanded, and the air flows out from the cylinder 130B into the outflow portion 64. Accordingly, as shown in FIG. 9A, the piston 130A is lowered and the expansion / contraction chamber 74 is contracted.

  Moreover, as shown in FIG. 10, the cylindrical bellows-like member 140 which has the side wall 140A made into the bellows shape may be sufficient. The bellows-like member 140 has one end (the right end in FIG. 10) closed, the other end (the left end in FIG. 10) opened, and the open end communicating with the air vent pipe 70. The bellows-like member 140 has a bellows-like side wall 140A that can be expanded and contracted. As shown in FIG. 10B, the side wall 140A expands, so that the expansion / contraction chamber 74 is enlarged, as shown in FIG. 10A. Thus, the expansion / contraction chamber 74 is contracted by contracting the side wall 140A.

  The forming member forming the expansion / contraction chamber 74 is configured such that the air in the expansion / contraction chamber 74 returns to the outflow portion 64 when the inside of the outflow portion 64 becomes negative pressure or returns to atmospheric pressure after expansion. Preferably it is. For example, the inflow resistance of air flowing from the expansion / contraction chamber 74 to the outflow portion 64 side is made smaller than the inflow resistance of air flowing from the vent valve 68 to the outflow portion 64 side, thereby allowing the air in the expansion / contraction chamber 74 to flow out. 64 can easily flow into the interior. In other words, air can be more easily introduced into the outflow portion 64 from the expansion / contraction chamber 74 than from the vent valve 68. This ease of air flow can be adjusted by, for example, increasing the flexibility of the forming member that forms the expansion / contraction chamber 74 to facilitate the expansion / contraction of the expansion / contraction chamber 74.

  In addition, by applying a force to the forming member in the direction of reducing the internal volume, when the inside of the outflow portion 64 becomes atmospheric pressure or negative pressure, air easily flows into the outflow portion 64 from the expansion / contraction chamber 74. be able to. For example, by using a member such as rubber that can be elastically deformed as a forming member, the expansion / contraction chamber 74 can be reduced or the expansion / contraction chamber 74 can be reduced even when a material that does not have elasticity is used. The air can be returned from the expansion / contraction chamber 74 to the outflow portion 64 by performing “crimping” so as to restore the shape to be restored. In addition, when using the cylindrical member 130 shown in FIG. 9 or the bellows-like member 140 shown in FIG. The chamber 74 can be reduced.

  Further, the upstream end portion of the air vent pipe 70 may be connected to the lower portion of the outflow portion 64. Further, the air vent pipe 70 may be configured to extend obliquely upward from the outflow portion 64.

  Further, as the vent valve 68, a check valve constituted by various mechanical elements such as an elastic body such as a membrane valve or a ball check valve can be used. Although the case where the ventilation valve 68 is provided in the outflow part 64 was demonstrated, the structure provided in the air vent pipe 70 may be sufficient as shown in FIG. Furthermore, the drain trap of the present invention may be configured without the vent valve 68.

  Moreover, although the inner cylinder 76 is provided in the drain trap main body 50 shown in FIG. 3, the inner cylinder 76 can also be abbreviate | omitted.

  Moreover, although the outflow part 64 and the outflow side connection pipe 66 were demonstrated to exist separately, the outflow part 64 may include the outflow side connection pipe 66.

  The drainage structure of the unit bath of the present invention assumes a conventional gradient drainage structure having a sloped drain pipe 52, but efficiently drains water from a watering device using siphon force. It can also be applied to a siphon drainage structure to be discharged.

FIG. 12 is a schematic view showing a siphon drainage structure. The siphon drainage structure 200 is mainly used in an apartment house composed of a plurality of floors, and includes a drainage stack 202 that allows drainage to flow downward. A watering device 204 is provided on each floor of the apartment house, and a siphon drain pipe 206 through which drainage discharged from the watering device 204 flows is connected to the watering device 204.
The siphon drain pipe 206 is configured to include a horizontal pulling pipe 208 connected to the watering device 204 and a soot pipe 210 communicating with the horizontal pulling pipe 208.

The horizontal pulling pipe 208 extends in the horizontal direction on the floor slab 14. The horizontal pulling pipe 208 is disposed without any gradient, and allows the waste water flowing from the unit bath 10 to the horizontal pulling pipe 208 to flow in the horizontal direction.
The dredging pipe 210 communicating with the horizontal pulling pipe 208 extends in the vertical direction (longitudinal direction) along the drainage stack 202. The soot pipe 210 generates siphon force by causing the drainage water flowing from the horizontal pulling pipe 208 to the soot pipe 210 to flow downward.

  A drainage joint 212 that connects the dredger pipe 210 and the drainage stack 202 is provided. The drainage joint 212 joins the drainage from the trough pipe 210 to the drainage stack 202.

  Here, in the conventional drainage, even if the sealing depth h is shallow, if the drain pipe 52 after the drain trap body 50 is long, the unit bath 10 has to be raised, whereas the siphon drainage structure as described above If it is 200, there is no need to raise the height, so the significance of making the sealing depth h shallower appears.

  In addition to the siphon drainage structure described above, the drainage trap of the present invention can also be applied to a drainage structure that can flow with a small diameter, such as a vacuum drainage or a pressure feed drainage structure.

10 Unit bath 12 Drainage structure 14 Floor slab 30 Waterproof pan for bathroom (floor surface of unit bath)
40 Drain port 44 Drain pipe for bathtub (inflow part)
46, 100, 110, 120 Drain trap 64 Outflow part 68 Vent valve 75 Storage space (sealed part)
76, 102 Air vent pipe 74 Expansion / contraction chamber 72, 112, 122 Bag 208 Horizontal pulling pipe (drainage pipe)
210

Claims (9)

An inflow section into which wastewater flows,
An outflow part through which the drainage flows;
A water-sealed sealing portion provided between the inflow portion and the outflow portion;
An expansion / contraction chamber communicating with the outflow portion and expanding / contracting by air pressure;
Equipped with a drain trap.   The drain trap according to claim 1, further comprising an air vent pipe having one end portion communicating with the outflow portion and the other end portion communicating with the expansion / contraction chamber.   The drain trap according to claim 2, wherein the other end of the air vent pipe extends upward.   The drain trap according to claim 2 or 3, wherein the other end side of the air vent pipe is arranged in a vertical direction.   The drain trap according to any one of claims 2 to 4, wherein the one end of the air vent pipe communicates with an upper part of the outflow part.   The drainage trap according to any one of claims 1 to 5, further comprising a vent valve that is provided in the outflow portion and allows air from outside to flow into the outflow portion.   The drain trap according to any one of claims 1 to 6, wherein the expansion / contraction chamber is formed of a bag. A drain opening provided in the unit bath;
The drainage trap according to any one of claims 1 to 7, wherein the drainage trap is communicated with the drainage port and provided between a floor surface of the unit bath and a floor slab.
Unit bath drainage structure. A lateral pipe that communicates with the outflow portion of the drain trap and extends in the lateral direction, and allows the drainage from the drain trap to flow laterally;
A vertical pipe that communicates with the horizontal pipe and extends downward, and generates siphon force by flowing down drainage from the horizontal pipe;
The unit bus drainage structure according to claim 8.

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