JP7689466B2 - Drain trap - Google Patents

Description

This disclosure relates to a drain trap.

Conventionally, drain traps that are installed under the floor of a bathroom unit or the like are known. For example, the following Patent Document 1 describes a drain trap equipped with a water collection section. Washing area side wastewater drained from the washing area and bathtub side wastewater drained from the bathtub flow into the water collection section. The wastewater that flows into the water collection section is discharged into a drain pipe.

JP 2010-242462 A

In the case of Patent Document 1, all bathtub wastewater is discharged via the pooling section. Compared to the washing area wastewater, the bathtub wastewater flows into the pooling section at a large instantaneous flow rate, which may result in backflow into the washing area. To avoid this, for example, it is possible to provide a larger flow area for the pooling section. However, in this case, it is not possible to generate a sufficient flow rate when the washing area wastewater flows in, and gravel and other materials that flow in together with the washing area wastewater may accumulate at the bottom of the pooling section.

This disclosure was made in consideration of the above-mentioned conventional situation, and aims to provide a drain trap that can suppress the backflow of bathtub drainage into the washing area while suppressing the generation of deposits.

The drain trap disclosed herein has a receiving section into which the washing area drain flows, and the receiving section has an inlet formed at the bottom into which a portion of the bathtub drain flows.

FIG. 2 is a side view showing the drain trap according to the first embodiment, illustrating the installed state. FIG. 2 is a plan view showing the drain trap according to the first embodiment. 3 is a cross-sectional view taken along line III-III in FIG. 2, showing the state in which the hair catcher is attached. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 5 is a cross-sectional view corresponding to line VV in FIG. 4. 6 is a cross-sectional view taken along line VI-VI in FIG. 2. FIG. 2 is a perspective view showing a flow diverting member according to the first embodiment. FIG. 2 is a side view showing the flow dividing member according to the first embodiment, as viewed from the upstream side.

<Embodiment 1>
As shown in FIG. 1, the bathroom unit 90 is installed on a floor structure F such as a slab. The bathroom unit 90 includes a bathtub 91, a washing area 93, and a bathtub pan 95. The bathtub 91 has a bathtub drain 92 for draining water from within the bathtub 91. The bathtub pan 95 is disposed below the bathtub 91. The bathtub pan 95 has a bathtub pan drain 96 below the drain of the bathtub 91. A bathtub drain pipe 97 is connected to the bathtub pan drain 96. The washing area 93 forms the floor surface of the bathroom unit 90. The washing area 93 has a washing area drain 94 for draining water from the washing area 93.

As shown in FIG. 1, the drain trap 1 is installed between the washing area 93 that constitutes the floor surface of the bathroom unit 90 and the upper surface of the floor structure F on which the bathroom unit 90 is installed. The bathtub side drainage is introduced into the drain trap 1 at the bathtub side connection part 2 to which the downstream end of the bathtub drain pipe 97 is connected, and the washing area side drainage is introduced into the washing area side inlet 40A described below to which the washing area drain outlet 94 is connected. The introduced bathtub side drainage and washing area side drainage each flow inside the drain trap 1 and are led out to the external lead-out pipe 100 via the lead-out side connection part 3, which is the downstream end of the drain trap 1.

In the following description, the up and down directions of the drain trap 1 are defined as the directions when the drain trap 1 is installed, i.e., when the drain trap 1 is installed under the floor of the bathroom unit 90. For convenience, the left and right directions are defined as the left and right directions when viewed from the upstream bathtub side connection part 2 side to the downstream outlet side connection part 3 side. The Y-axis and Z-axis shown in each figure represent the left and right directions and the up and down directions, respectively. The positive directions of the Y-axis and Z-axis are the left and up directions, respectively. The X-axis shown in each figure is perpendicular to the Y-axis and Z-axis. The positive direction of the X-axis is the direction from the upstream bathtub side connection part 2 side to the downstream outlet side connection part 3 side.

As shown in Figures 2 to 5, the drain trap 1 has a first flow section 10 through which the washing area drainage flows, a second flow section 20 through which the bathtub drainage flows, and an outlet section 30 that outputs the drainage that flows in from the first flow section 10 and the second flow section 20 to an external outlet pipe 100. The first flow section 10 also flows a portion of the bathtub drainage that is diverted by the diverter section 60 described below.

3 and 5, the first flow section 10 has a receiving section 40 and an outflow section 50. The wastewater flowing through the first flow section 10 flows through the receiving section 40 and the outflow section 50 in that order and is discharged to the external discharge pipe 100. The receiving section 40 has a bottomed cylindrical shape with a cylindrical peripheral wall 41 and a disk-shaped bottom wall 42 that closes the lower end of the peripheral wall 41. The receiving section 40 forms a washing place side inlet 40A and a communication port 40B. The washing place side inlet 40A is the upper end opening of the peripheral wall 41 and opens in a circular shape in a plan view. The drain trap 1 is connected to the washing place drain outlet 94 at the washing place side inlet 40A in the receiving section 40. As a result, the receiving section 40 receives the washing place side wastewater from above. A hair catcher 80 that catches hair and other foreign objects that flow in from the washing area 93 is detachably attached to the washing area inlet 40A (see Figure 2).

The communication port 40B is an example of an outlet according to the present disclosure. The communication port 40B allows the wastewater that has flowed into the receiving section 40 to flow out to the outflow section 50. The communication port 40B opens at the lower end of the peripheral wall 41. In detail, as shown in FIG. 3, the communication port 40B is formed at the lower end of the cylindrical peripheral wall 41 of the receiving section 40, which separates the receiving section 40 from the outflow section 50. The communication port 40B communicates the receiving section 40 and the outflow section 50. The communication port 40B is the downstream end of the receiving section 40 and the upstream end of the outflow section 50. An inspection opening 40C is formed above the communication port 40B. The inspection opening 40C communicates the receiving section 40 and the outflow section 50, similar to the communication port 40B. The inspection opening 40C is watertightly closed by the plug member P in the use state. Therefore, when in use, wastewater that flows into the receiving section 40 flows out to the outflow section 50 only through the communication port 40B.

3 and 5, the outflow section 50 is provided adjacent to the receiving section 40 with the peripheral wall 41 in between. The outflow section 50 has an outlet 50A. The outlet 50A corresponds to the downstream end of the first flow section 10. The outlet 50A is connected to the discharge section 30. As shown in FIG. 3, the lower end of the outlet 50A is located above the upper end of the communication port 40B. In the first flow section 10, a water sealing surface S is formed across the receiving section 40 and the outflow section 50, with the lower end position of the outlet 50A as the upper surface. As a result, a trap structure is formed in the first flow section 10 in which the communication port 40B is located below the water sealing surface S.

As shown in Figures 4 and 5, the second flow section 20 forms a series of flow paths extending from the inlet opening 20A at the upstream end to the outlet opening 20B at the downstream end. The inlet opening 20A is connected to the bathtub side connection section 2. The outlet opening 20B is connected to the outlet section 30. The second flow section 20 has a partition wall 21. The partition wall 21 extends vertically to separate the second flow section 20 into an upstream side and a downstream side. At the lower end of the partition wall 21, a gap 21A is formed that connects the upstream side and the downstream side of the second flow section 20. The upper end height of the gap 21A is set to be equal to the upper end height of the communication port 40B in the receiving section 40.

In the second flow section 20, the lower end height of the outlet opening 20B and the upper end height of the partition wall 21 are set to be equal to the lower end height of the outlet port 50A in the outflow section 50 and the upper end height of the communication port 40B, respectively. As a result, a water sealing surface S is formed in the second flow section 20 at the same height as the water sealing surface S in the first flow section 10. By forming the water sealing surface S, a trap structure is formed in the second flow section 20 in which the gap 21A is located below the water sealing surface S.

The drain trap 1 is equipped with a diverting section 60. The diverting section 60 diverts a portion of the bathtub side drainage that flows into the second flow section 20. The diverting section 60 allows the diverted portion of the bathtub side drainage to flow into the first flow section 10. The diverting section 60 allows the diverted portion to flow into the receiving section 40 on the first flow section 10 side. The receiving section 40 forms a diverted inlet 40D into which the bathtub side drainage diverted by the diverting section 60 flows. The diverted inlet 40D is an example of an inlet according to the present disclosure. The diverted inlet 40D opens opposite the communication port 40B as an outlet.

As shown in FIG. 5, the diverter 60 is disposed downstream of the inlet opening 20A in the second circulating section 20. In this embodiment, the first circulating section 10 and the second circulating section 20 are provided adjacent to each other on the left and right. The receiving section 40 has a through hole 41A that penetrates the peripheral wall 41 from the second circulating section 20 side. The diverter 60 divides the bathtub side drainage that flows in from the inlet opening 20A into a main flow F1 that flows directly through the second circulating section 20 and a diverter F2 that flows through the through hole 41A and into the receiving section 40 on the first circulating section 10 side.

As shown in Figures 5 to 8, the flow dividing section 60 has a flow dividing member 70. The flow dividing member 70 is removably attached to the through hole 41A. The flow dividing member 70 has a partition wall 71, a flow dividing wall 72, a flow straightening wall 73, and a nozzle 74.

As shown in FIG. 5, the partition wall 71 separates the space on the first flow section 10 side from the space on the second flow section 20 side. The partition wall 71 has an outer shape that is the same as the opening shape of the through hole 41A. The inner circumferential surface 71A of the partition wall 71 is formed with a curvature that is the same as the curvature of the inner circumferential surface of the peripheral wall 41. The inner circumferential surface 71A is generally flush with the inner circumferential surface of the peripheral wall 41 when the flow dividing member 70 is fitted into the through hole 41A.

As shown in FIG. 5, the dividing wall 72 extends from the outer peripheral surface 71B, which is the surface of the partition wall 71 facing the second flow section 20, toward the upstream inlet opening 20A. The dividing wall 72 extends vertically and divides the upstream space of the second flow section 20 in the left-right direction. Of the bathtub side wastewater that flows into the second flow section 20 from the inlet opening 20A, the wastewater that branches off to the left of the dividing wall 72 flows directly down the second flow section 20 as the main flow F1 of the bathtub side wastewater. The wastewater that branches off to the right of the dividing wall 72 flows into the receiving section 40 as the branch flow F2 of the bathtub side wastewater and flows down the first flow section 10.

The straightening wall 73 straightens the wastewater flowing down the second flow section 20 as a main flow F1. As shown in Figures 7 and 8, the straightening wall 73 extends horizontally to the left from the left side of the flow dividing wall 72. Two straightening walls 73 are provided, one above the other.

The nozzle 74 directs the diverted flow F2 toward the communication port 40B. As shown in Figs. 5 and 6, the nozzle 74 extends from the lower end of the inner circumferential surface 71A of the partition wall 71 toward the communication port 40B. The nozzle 74 forms a diverted flow passage 74A. The diverted flow passage 74A penetrates the partition wall 71 at the lower end of the partition wall 71. The diverted flow passage 74A allows the diverted flow F2 diverted by the diverted wall 72 to flow toward the receiving section 40. The diverted flow F2 that flows through the diverted flow passage 74A flows into the receiving section 40 from the diverted flow inlet 40D at the tip of the nozzle 74.

The operation of the drain trap 1 with the above configuration will be explained. Washing area side wastewater and bathtub side wastewater flow into the drain trap 1. Each of the inflowing wastewater is led to the external discharge pipe 100. Of the wastewater flowing into the drain trap 1, the washing area side wastewater flows through the first flow section 10. Specifically, the washing area side wastewater flows into the receiving section 40 from the washing area side inlet 40A while passing through the hair catcher 80. The wastewater that flows into the receiving section 40 flows out from the communication port 40B to the outflow section 50 side, and is led to the external discharge pipe 100 via the discharge section 30.

Of the wastewater flowing into the drain trap 1, the bathtub side wastewater is divided into a main flow F1 flowing through the second flow section 20 and a diverted flow F2 flowing through the first flow section 10. Specifically, as shown in FIG. 5, the bathtub side wastewater that flows into the bathtub drain pipe 97 from the bathtub 91 flows into the second flow section 20 from the inlet opening 20A. The bathtub side wastewater is divided into two flows, the main flow F1 and the diverted flow F2, at the diverted flow section 60. The main flow F1 passes through the left side of the diverted flow wall 72 and flows down the second flow section 20 as it is, and is discharged to the external discharge pipe 100 via the discharge section 30. The diverted flow F2 passes through the right side of the diverted flow wall 72 and flows into the receiving section 40, and flows on the first flow section 10 side.

In detail, the diverted flow F2 flows along the right side of the diverted flow wall 72, flows through the diverted flow passage 74A, and enters the receiving section 40 from the diverted flow inlet 40D. The diverted flow inlet 40D is formed at the bottom of the receiving section 40. As a result, the diverted flow F2 that flows into the receiving section 40 from the diverted flow inlet 40D flows down along the upper surface of the bottom wall 42 of the receiving section 40. By flowing along the upper surface of the bottom wall 42 of the receiving section 40, the diverted flow F2 washes away any deposits such as sand that have accumulated on the upper surface of the bottom wall 42. In this way, the drain trap 1 suppresses the occurrence of deposits in the receiving section 40 by directing a portion of the bathtub side drainage into the lower part of the receiving section 40 as the diverted flow F2.

The diverted flow F2 flows into the receiving section 40 from the diverted flow inlet 40D. The diverted flow inlet 40D opens opposite the communication port 40B, which is the outlet of the receiving section 40. Therefore, the diverted flow F2 that flows into the receiving section 40 from the diverted flow inlet 40D does not stagnate within the receiving section 40, but flows linearly in a plan view over the bottom wall 42 of the receiving section 40 to reach the communication port 40B.

The diverted flow F2 flows through the diverted flow passage 74A and into the receiving section 40. As described above, the diverted flow passage 74A is a passage formed in the nozzle 74. The nozzle 74 is nozzle-shaped and extends toward the communication port 40B. Therefore, the diverted flow F2 that flows through the diverted flow passage 74A is ejected from the diverted flow inlet 40D with directivity toward the communication port 40B. The diverted flow F2 ejected from the diverted flow inlet 40D flows with relatively strong water force on the bottom wall 42 of the receiving section 40 and flows out from the communication port 40B. Therefore, the drain trap 1 is capable of washing away deposits in the receiving section 40 with relatively strong water force by the diverted flow F2 that flows through the diverted flow passage 74A and is ejected from the diverted flow inlet 40D.

In the diversion section 60, the bathtub side drain is divided into the left and right directions. Therefore, the drain trap 1 can divide the bathtub side drain into the main flow F1 and the diversion F2 in the desired distribution. For example, when the water flow is divided into the vertical direction, the distribution between the top and bottom may vary depending on the water volume and water force. In contrast, when the water flow is divided into the horizontal direction, the distribution is less likely to vary depending on the water volume and water force. Therefore, the bathtub side drain is always divided into the main flow F1 and the diversion F2 in the desired distribution.

The flow dividing section 60 has a flow dividing member 70. The flow dividing member 70 is removably attached to the through hole 41A of the peripheral wall 41 of the receiving section 40. Therefore, the drain trap 1 can be kept clean by removing the flow dividing member 70 and cleaning the second flow section 20 side.

As described above, the drain trap 1 according to the first embodiment includes a receiving section 40. The receiving section 40 is where the washing area drainage flows in. The receiving section 40 forms a diversion inlet 40D as an inlet. The diversion inlet 40D is formed at the bottom of the receiving section 40. Diversion inlet 40D is where the diversion F2 flows in as a portion of the diverted bathtub drainage.

In this way, the drain trap 1 allows the diverted flow F2, which is a part of the bathtub side drainage, to flow into the receiving section 40. Since the bathtub side drainage flows at a large flow rate instantaneously compared to the washing place side drainage, if the entire amount is allowed to flow into the receiving section, there is a risk of it flowing back to the washing place side. In contrast, in the drain trap 1, the bathtub side drainage that flows into the receiving section 40 is the diverted flow F2, which is a diverted part of the bathtub side drainage, so the flow rate of the drainage flowing through the receiving section is suppressed. The drain trap 1 forms a diverted flow inlet 40D at the bottom into which the diverted flow F2 flows. Therefore, the drain trap 1 can suitably discharge sediments such as gravel that have accumulated on the upper surface of the bottom wall 42 of the receiving section 40 together with the diverted flow F2. Therefore, the drain trap 1 can suppress the backflow of the bathtub side drainage into the washing place 93 while suppressing the generation of sediments.

In the drain trap 1, the receiving section 40 has a communication port 40B formed at the bottom, facing the diversion inlet 40D. The communication port 40B is an example of an outlet according to the present disclosure. Therefore, the drain trap 1 can effectively discharge deposits on the upper surface of the bottom wall 42 of the receiving section 40 through the communication port 40B.

In the drain trap 1, the diversion inlet 40D is formed at the tip of the nozzle 74. The nozzle 74 forms a flow toward the communication port 40B. Therefore, the drain trap 1 can eject the diversion F2 with a relatively strong water force onto the bottom wall 42 of the receiving section 40, effectively washing away the sediments.

The drain trap 1 has an inlet opening 20A as a bathtub side drainage inlet, and a diverter section 60. Bathtub side drainage flows into the inlet opening 20A. The diverter section 60 is located downstream of the inlet opening 20A and diverts the bathtub side drainage. Therefore, the drain trap 1 can divert the bathtub side drainage in an optimal manner.

In the drain trap 1, the diverter 60 divides the bathtub drain to the left and right. Therefore, the drain trap 1 can divide the bathtub drain in the desired proportions regardless of the water volume or water force.

In the drain trap 1, the diverter section 60 has a diverter member 70. The diverter member 70 is detachably attached to the receiving section 40. Therefore, the drain trap 1 can be cleaned by removing the diverter member 70 from the receiving section 40, and good cleanliness can be maintained.

<Other embodiments>
The present disclosure is not limited to the embodiments described above and illustrated in the drawings, and for example, the following embodiments are also included within the technical scope of the present disclosure.

The drain trap according to the present disclosure may not have a bathtub drain inlet and a diverter. In this case, the drain trap may be configured, for example, so that a portion of the bathtub drainage diverted elsewhere flows directly into the receiving section.

When a flow dividing section is provided, it is not essential that the flow dividing section be detachably attached to the receiving section. The flow dividing section may be provided integrally with the receiving section, for example.

The inlet does not have to be formed at the tip of the nozzle. For example, the inlet may open directly into the peripheral wall of the receiving section.

It is not essential that the bathtub side drain is divided in the left and right directions. The bathtub side drain may be divided in the up and down directions, for example. When the flow divided in the up and down directions is the flow divided to the lower side and flows into the receiving section, the following effect is achieved. That is, when the bathtub side drain diverted to the lower side flows into the receiving section, the drain trap can cause the water flow that scours the upper surface of the bottom wall of the receiving section to flow into the receiving section, even if the amount of water in the bathtub side drain is relatively small. When the amount of water in the bathtub side drain is relatively large, the drain trap can direct the excess flow to the outside without passing through the receiving section.

1...Drain trap, 20A...Inlet opening (bathtub side drain inlet), 40...Receiving section, 40B...Communication opening (outlet), 40D...Diversion inlet (inlet), 60...Diversion section, 74...Nozzle

Claims (5)

It is equipped with a receiving section where wastewater from the washing area flows in.
The receiving section has an inlet at the bottom through which a portion of the bathtub drain flows in, and an outlet at the bottom opposite the inlet, and an inspection opening communicating with the space downstream of the outlet is formed above the outlet,
A drain trap comprising a plug member that is detachably attached to the inspection opening from the receiving portion side to close the inspection opening . 2. The drain trap of claim 1 , wherein the inlet is formed at a tip of a nozzle that forms a flow toward the outlet. A bathtub side drainage inlet into which the bathtub side drainage flows;
A diversion section arranged downstream of the bathtub side drain inlet and diversion of the bathtub side drainage;
Equipped with
The drain trap according to claim 1 or 2 , wherein a portion of the bathtub-side drain is a bathtub-side drain diverted by the diverter. The drain trap according to claim 3 , wherein the dividing portion divides the bathtub side drain in the left and right directions. The drain trap according to claim 3 or 4 , wherein the flow dividing portion is provided removably in the receiving portion.

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