JP6647793B2 - Siphon drainage structure - Google Patents

Description

  The present invention relates to a siphon drainage structure.

  In recent years, a so-called siphon drainage structure has been proposed as an alternative to the conventional gradient drainage structure (for example, see Patent Document 1). The siphon drainage structure uses a siphon drainage pipe connected to the plumbing fixture, and uses the siphon force (negative pressure) generated by the vertical pipe forming the hanging part of the siphon drainage pipe to improve drainage efficiency from the plumbing plumbing. It is a structure to make it. The siphon drainage pipe is smaller in diameter than a general drainage pipe for gradient drainage, and easily overflows even if the amount of water is small.

JP-A-2002-121793

By the way, if air is mixed in the drainage in the siphon drainage pipe, an abnormal noise may be generated in the siphon drainage pipe. This noise is emitted from the drainage outlet of the plumbing fixture through the piping and may propagate to the occupants.However, by installing a water ring type trap, the transmission of the noise can be suppressed by sealing the water. Can be.
However, in a closed trap, for example, when a large positive pressure is generated in the drain stack, the sealed water is blown out from the drain and the sealed water is lost, so that the seal is broken and the odor is discharged from the drain to the living environment. May be released.

  The present invention has been made in view of the above circumstances, and has as its object to provide a siphon drainage structure that can suppress emission of abnormal noise from a drainage port and can prevent breakage of trap water due to positive pressure.

The siphon drainage structure according to claim 1, wherein a first drainage introduction pipe is provided downstream of a drainage port of the first watering device in a drainage direction, and flows drainage from the first watering device; A water-sealed trap provided downstream of the drain port in the drain direction and provided with a storage section for storing sealed water, and connected to the first drain introduction pipe, and provided downstream of the storage section in the drain direction. A check valve that allows the flow of fluid to the downstream side in the drain direction of the waste water, and prevents the flow of the fluid to the upstream side in the drain direction of the waste water; and A lower end is connected to a pipe portion extending in a vertical direction on the downstream side of the storage portion, and is provided at an upper end of a pipe extending upward from the lower end, and introduces air between the check valve and the storage portion. Ventilation means, provided downstream of the first drainage introduction pipe in the drainage direction A horizontal drawing pipe through which drainage from the first water circulating device flows in a horizontal direction; and a vertical pipe provided downstream of the horizontal drawing pipe in a drainage direction to drop the drainage from the horizontal drawing pipe in a vertical direction. A tube.

  In the siphon drainage structure according to the first aspect, the drainage discharged from the drainage outlet of the first plumbing fixture is supplied to the horizontal drainage pipe via the first drainage introduction pipe, the water ring trap, and the check valve. Inflow. The drainage that has flowed into the horizontal draw pipe flows in the horizontal direction, and then flows into the vertical pipe. If the drainage in the vertical pipe falls due to gravity while the vertical pipe is filled with drainage, a suction force corresponding to the head difference in the vertical pipe, that is, a siphon force, is generated inside the vertical pipe. When the siphon force is generated, the drainage in the horizontal drawing pipe is sucked toward the vertical pipe by the siphon force, and the horizontal drawing pipe and the vertical pipe become a so-called full flow which is filled with the drainage, and the horizontal drawing pipe and the vertical pipe pass through. Flow down.

  In the siphon drainage structure according to claim 1, since the sealed water is stored in the storage part of the water ring trap and the air is not continuous, the sound generated on the downstream side in the drainage direction with respect to the storage part. If water attempts to propagate to the upstream side in the drainage direction through the flow channel, sound propagation (air vibration) can be suppressed by sealing the water, and the sound generated downstream in the drainage direction from the storage section will be transmitted from the drain port. Release can be suppressed.

Further, since the check valve is connected to the first drainage introduction pipe, when the side drawing pipe side becomes positive pressure, the check valve prevents air or drainage from the drawing side to the drain port side. Backflow can be suppressed, and breakage of the water ring trap can be suppressed. Accordingly, it is possible to prevent the sealing water from spouting from the drain port and to release the odor from the drain port to the living environment.
In addition, "positive pressure" means that the pressure is higher than the outside air in the environment where the first water circulating device is arranged.
The water seal trap may be provided at an end in the longitudinal direction of the first drainage introduction pipe, or may be provided at an intermediate part in the longitudinal direction of the first drainage introduction pipe. Also, the water ring trap may be attached to the first water circulating device. The check valve may be provided at an end of the first drainage introduction pipe in the longitudinal direction, or may be provided at an intermediate part of the first drainage introduction pipe in the longitudinal direction.
In the siphon drainage structure according to the first aspect, since the check ring is provided on the downstream side of the storage section in the drain direction, the check ring can prevent the positive pressure from being applied to the sealing of the storage section.
In the siphon drainage structure according to the first aspect, for example, when the downstream side in the drainage direction of the storage unit has a negative pressure, the negative pressure is suppressed by introducing air from the ventilation unit to the first drainage introduction pipe. Thus, the opening of the water seal trap can be suppressed.
The "negative pressure" means that the pressure is lower than the outside air in the environment where the siphon drainage structure is arranged, and is generated by suction of the air in the drainpipe together with the drainage by the siphon force.

According to a second aspect of the invention, the siphon drainage structure according to claim 1, wherein the water seal type trap and the first drain inlet pipe of the drainage direction downstream side of the check valve, or the crosscut tube And a second drain introduction pipe for draining the drain water from the second plumbing fixture.

In the siphon drainage structure according to the second aspect, drainage from the second plumbing fixture can flow to the first drainage introduction pipe or the horizontal draw pipe via the second drainage introduction pipe. The drainage pushes the air inside the second drainage introduction pipe when draining the wastewater from the second plumbing fixture, whereby the first drainage plenum side of the second drainage plumbing on the first plumbing fixture side. Although the drainage introduction pipe may have a positive pressure, the second drainage introduction pipe is provided with a check valve on the first drainage introduction pipe side of the second drainage introduction pipe. Even if drainage is discharged from the device, the opening of the water ring trap is suppressed.

The invention according to claim 3 is the siphon drainage structure according to claim 1 or 2 , wherein the ventilation means is a ventilation valve.

In the siphon drainage structure according to the third aspect , for example, when the downstream side in the drainage direction of the storage unit has a negative pressure, the air can be introduced into the first drainage introduction pipe via the ventilation valve. The use of the ventilation valve simplifies the configuration of the ventilation means.
In addition, the vent valve sucks the atmosphere at the time of drainage to protect the water sealing of the water seal trap, and closes the valve at normal times to prevent the leakage of offensive odor and the like. As an example of the vent valve, one described in JP-A-2009-299866 can be mentioned.

According to a fourth aspect of the present invention, in the siphon drainage structure according to any one of the first to third aspects, the check valve includes a tubular portion, a throttle portion extending from the tubular portion, An on-off valve provided at a tip end of the throttle unit to close the flow path by surface contact with elastic force.

In the backflow prevention valve of the siphon drainage structure according to the fourth aspect , the tubular portion can be connected to a pipe or the like. In a normal state in which the drainage is not discharged from the first water circulating device, the check valve is closed by the on-off valve to block the flow of the fluid upstream in the drainage direction. On the other hand, when the drainage is discharged from the first water circulating device, the on-off valve is expanded by the drainage, and the drainage flows downstream of the check valve in the drainage direction. This check valve is designed to pass garbage and contaminants better than a general check valve.It also has a faster reaction speed in the direction of closing under positive pressure, and can be closed even at low pressure. Can be.

  As described above, the siphon drainage structure of the present invention has the above-described configuration, and thus has an excellent effect that it is possible to suppress breakage of the trap due to positive pressure while suppressing emission of abnormal noise from the drainage outlet.

It is sectional drawing which shows a part of building to which the siphon drainage system which concerns on the 1st reference example was applied. Showing the check valve according to the siphon drainage system of the first reference example, is a perspective view from the drainage direction downstream side. FIG. 3 is a cross-sectional view (a cross-sectional view taken along line 3-3 in FIG. 2) along the axis of the check ring. (A) is a front view showing the check valve with the open / close valve closed as viewed from the downstream side in the drain direction, and (B) is a front view showing the check valve with the open valve opened as viewed from the downstream side in the drain direction. It is. It is a side view showing a part of the building to which the siphon drainage system concerning a 2nd example of reference was applied. It is a side view showing a part of the building to which the siphon drainage system concerning the modification of a 2nd reference example was applied. It is a side view showing a part of the building to which the siphon drainage system concerning a 1st embodiment was applied. It is a side view showing a part of the building to which the siphon drainage system concerning a reference example (a modification of a 1st embodiment) was applied. It is a side view showing a part of the building to which the siphon drainage system concerning a 2nd embodiment was applied. It is a side view showing a part of the building to which the siphon drainage system concerning a reference example (a modification of a 2nd embodiment) was applied. It is a side view showing a part of the building to which the siphon drainage system concerning a 3rd reference example was applied. It is a side view showing a part of a building to which a siphon drainage system concerning a reference example (a modification of the third reference example ) is applied.

[ First Reference Example ]
Before describing an embodiment of the present invention, a siphon drainage system 10 according to a first reference example will be described with reference to FIGS.

As shown in FIG. 1, floor panels 14 are arranged at intervals on the slab 12 of the dwelling unit, and on the floor panel 14, a kitchen sink 16 as a first watering device, and A dishwasher 18 as a second water-supply device is arranged. Disposer 20 is attached to drain 16A of kitchen sink 16. On the downstream side of the disposer 20 in the drainage direction, a pipe 21, a water seal type drain trap 22, and a joint 24 with a check valve are arranged. On the downstream side of the joint 24 with a check valve, the pipe 26 is provided. It is connected. The pipe 26 has a vertical portion 26A and a horizontal portion 26B extending horizontally from a lower end of the vertical portion 26A, and has a substantially L-shape in side view. Note that the pipe 21 and the pipe 26 of the present reference example correspond to a first drain introduction pipe of the present invention, and drain the drain of the kitchen sink 16.

A merging joint 27 and a siphon drain pipe 28 are arranged downstream of the pipe 26 in the drain direction. The siphon drainage pipe 28 includes a horizontal drawing pipe 28A having the same inner diameter as the pipe 26 and a vertical pipe 28B. The siphon drain pipe 28 and the pipe 26 may have different inner diameters.
The pipe 26 is connected to a horizontal drawing pipe 28 </ b> A of the siphon drain pipe 28 via a joining joint 27. The dishwasher 18 is connected to a junction 27 via a pipe 29. The horizontal drawing pipe 28A is disposed on the slab 12, and the vertical pipe 28B of the siphon drain pipe 28 is suspended through a vertical hole 30 formed in the slab 12, and extends vertically in the dwelling unit. 32. Note that the pipe 29 of the present reference example corresponds to the second drainage introduction pipe of the present invention, and the drainage of the dishwasher 18 flows.

The drainage trap 22 has, for example, a substantially S-shape, and has a structure in which the sealed water 31 is stored inside a substantially U-shaped storage portion 22A, and is a so-called water-sealed trap. In addition, a ventilation device 36 is connected to the drain trap 22 of the present reference example on the downstream side in the drainage direction of the sealed water 31. The ventilation device 36 of this reference example is a ventilation valve having a backflow prevention function. When the downstream side of the drainage trap 22 in the drainage direction becomes negative pressure, the outside air is taken into the trap downstream side and the drainage trap 22 Suppresses breach. The ventilation device 36 prevents the drainage and water in the pipe from being discharged to the outside.

(Check valve)
The joint 24 with a check valve is provided with a substantially cylindrical check valve 38 made of an elastic material such as rubber. The check valve 38 permits the flow of fluid such as liquid and gas to the downstream side in the drainage direction, and prevents the flow of fluid to the upstream side in the drainage direction. As shown in FIGS. 2 and 3, the check ring 38 includes an annular tubular portion 44 as an engagement portion that engages with the flange portion 42 provided on the main body 40 of the joint 24 with the check ring. On the downstream side of the tubular portion 44 in the drainage direction, a substantially cylindrical throttle portion 48 having a pair of flat surfaces 46 that are closer to each other as they are separated from the tubular portion 44 is integrally formed. The tubular portion 44 and the throttle portion 48 are coaxially arranged, and the center line (axis) CL of the tubular portion 44 and the center line (axis) CL of the throttle portion 48 match. Here, the center line CL coincides with the center axis of the fluid flowing through the check valve 38.

  As shown in FIG. 2, on the downstream side in the drainage direction of the throttle portion 48 (the side opposite to the tubular portion 44), the flat surface 46 faces and the direction perpendicular to the center line CL of the tubular portion 44 and the throttle portion 48. When viewed from the side, a substantially V-shaped opening / closing valve 50 whose longitudinal direction is orthogonal to the center line CL is integrally formed. The throttle portion 48 is a portion in which the cross-sectional area of the passage orthogonal to the center line CL is gradually narrowed from the main body portion 40 toward the on-off valve 50, that is, becomes smaller (see FIG. 3). The on-off valve 50 is formed to have a constant thickness as shown in FIG.

As shown in FIG. 4A, when the check ring 38 is viewed from the downstream side in the axial direction, a cutout 52 penetrating in the axial direction along the longitudinal direction is formed at the central portion in the thickness direction. Are formed. The flat plate portion 54 on one side and the flat plate portion 54 on the other side are connected to each other across the entire length in the axial direction with the notch 52 interposed therebetween. As shown in FIG. 4A, the on-off valve 50 includes a flat plate portion 54 on one side of the cut 52 and a flat plate portion 54 on the other side, as shown in FIG. Are closed as a valve by being in surface contact and close contact with each other, and when pressure is applied from the upstream side in the drainage direction, as shown in FIG. Each of the flat plate portions 54 is elastically deformed into a substantially circular arc shape to be in an open state as a valve (open in a slender substantially elliptical shape). The check valve 38 is not limited to the shape of the present embodiment . As the check valve 38, for example, those described in International Publication WO96 / 19620, WO98 / 25059 and the like can be used.

(Action, effect)
Next, the operation and effect of the siphon drainage system 10 of the present embodiment will be described.
When drainage is performed from the kitchen sink 16 by using the kitchen sink 16, the drainage reaches the joint 24 with a check valve through the disposer 20, the pipe 21, and the drain trap 22. When the wastewater flows into the check valve 38, the pressure of the wastewater pushes the open / close valve 50 as shown in FIG. 4 (B), and the wastewater passes through the open / close valve 50 and is discharged downstream in the drainage direction. Is done.

  Thereafter, the drainage from the kitchen sink 16 flows through the horizontal pulling pipe 28A and the vertical pipe 28B of the siphon drainage pipe 28, and in a state where a part of the vertical pipe 28B is filled with drainage, the drainage in the vertical pipe 28B is caused by gravity. When dropped, a siphon force corresponding to the head difference in the vertical tube 28B is generated inside the vertical tube 28B.

  The drainage in the horizontal pulling pipe 28A is sucked toward the vertical pipe 28B by the siphon force, and the horizontal pulling pipe 28A and the vertical pipe 28B become full flows filled with the drainage to increase the flow velocity and increase the horizontal pulling pipe 28A. , And the vertical pipe 28B, and the drainage from the kitchen sink 16 is discharged to the drain stack 32.

  Even when the drainage from the kitchen sink 16 is completed, a siphon force is generated in a state in which the inside of the vertical pipe 28B is filled with the drainage, and the inside of the horizontal drawing pipe 28A has a negative pressure. Outside air flows into the inside from the ventilation device 36 of the drain trap 22. That is, the pressure on the upstream side in the drainage direction of the check ring 38 is relatively larger than the pressure on the downstream side in the drainage direction. Passes through the on-off valve 50. When the inside of the horizontal drawing pipe 28A becomes a negative pressure, air flows into the horizontal drawing pipe 28A from the ventilation device 36, so that a large negative pressure does not act on the sealing water 31 of the drain trap 22, and the drain trap 22 Is suppressed.

  Here, if air is mixed in the drainage of the siphon drainage pipe 28, an abnormal noise may be generated inside the siphon drainage pipe 28. In particular, in the siphon drainage, since the drainage is sucked by the suction force of the siphon force, the air and the drainage are easily mixed, and abnormal noise is easily generated. This noise is propagated in the pipe from the horizontal drawing pipe 28A to the upstream side in the drainage direction, but the water sealing 31 of the drain trap 22 provided on the downstream side of the kitchen sink 16 in the drainage direction blocks the pipe line. Therefore, propagation of abnormal noise to the drainage direction upstream of the drain trap 22 is suppressed. This suppresses abnormal noise from the drain 16A of the kitchen sink 16 from directly propagating to the occupant's ear and causing discomfort.

  When most of the drainage is discharged to the downstream end of the vertical pipe 28B, the inside of the siphon drainage pipe 28 is ventilated with the internal space of the drainage stack 32, and the drainage upstream side of the check valve 38 and the drainage direction. The pressure difference with the downstream side is eliminated, and the on-off valve 50 is closed. Thereby, the backflow prevention valve 38 can suppress the backflow of the odor or the like from the downstream side in the drainage direction and the loss of the sealed water 31 in the drainage trap.

Further, when drainage is performed from the dishwasher 18, since the drainage pushes the air inside the pipe 29, the inside of the horizontal drawing pipe 28A and the inside of the pipe 26 may temporarily become positive pressure. Since the valve 38 maintains the closed state of the on-off valve 50, it is possible to prevent the drainage or air downstream of the on-off valve 50 in the drainage direction from flowing back to the upstream side of the on-off valve 50 in the drainage direction. For this reason, even if drainage is performed from the dishwasher 18, a positive pressure is suppressed from being applied to the sealing water 31 of the drain trap 22, and the opening of the drain trap 22 is suppressed. Therefore, it is suppressed that the sealing water 31 blows out from the drain port 16A. In the present embodiment , the pipe 29 is connected to the end of the horizontal portion 26B via the junction joint 27, but may be connected to the intermediate portion of the horizontal portion 26B. May be connected on the way. In addition, the positive pressure in the above is higher than the positive pressure in the pressure fluctuation (approximately ± 400 Pa) generated in the standing pipe 32, and the spouting of the sealed water is a problem that occurs more remarkably in the siphon drainage.

[ Second Reference Example ]
Next, a siphon drainage system 10 according to a second reference example will be described with reference to FIG. The same components as those of the first reference example are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 5, in the siphon drainage system 10 of the present reference example , the ventilation device 36 is connected to the vertical portion 26A of the pipe 26 on the downstream side in the drainage direction of the check valve 38 via the pipe 56.

Also in siphon drainage system 10 of the present embodiment, as in the first reference example, when the lateral pulling tube 28A becomes a negative pressure, air flows into the crosscut tube 28A from the ventilation device 36. In the siphon drainage system 10 of the present reference example , the negative pressure acting on the downstream side of the check ring 38 in the drain direction is suppressed, so that the opening and closing valve 50 of the check ring 38 is suppressed from opening, and the drain trap 22 is broken. Sealing is also suppressed. Other operations and effects of the siphon drainage system 10 shown in FIG. 5 are the same as those of the first reference example .

The siphon drainage system 10 according to the reference example shown in FIG. 6 is a modification of the siphon drainage system 10 shown in FIG. In the siphon drainage system 10 shown in FIG. 6, a ventilation device 58 having a different shape from the ventilation device 36 is directly connected to the vertical portion 26A of the pipe 26. The operation and effect of the siphon drainage system 10 shown in FIG. 6 are the same as those of the siphon drainage system 10 shown in FIG.

[ First Embodiment ]
Next, the siphon drainage system 10 according to the first embodiment of the present invention will be described with reference to FIG. The same components as those of the above-described reference example are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIG. 7, in the siphon drainage system 10 of the present embodiment, the ventilation device 36 is connected via a pipe 56 to the upstream side of the check ring 38 in the drainage direction. Therefore, when the inside of the horizontal drawing pipe 28A becomes a negative pressure, air flows into the horizontal drawing pipe 28A from the ventilation device 36 via the check valve 38 and the pipe 26, and the drain trap 22 is opened. Is suppressed.

The siphon drainage system 10 as a reference example shown in FIG. 8 is a modified example of the siphon drainage system 10 shown in FIG. In the siphon drainage system 10 shown in FIG. 8, a ventilation device 58 having a different shape from the ventilation device 36 is directly connected to the vertical portion 26A of the pipe 26. The operation and effect of the siphon drainage system 10 shown in FIG. 8 are the same as those of the siphon drainage system 10 shown in FIG.

Second Embodiment
Next, a siphon drainage system 10 according to a second embodiment of the present invention will be described with reference to FIG. The same components as those of the above-described reference example and the embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the siphon drainage system 10 shown in FIG. 9, the joint 24 with a check valve is provided in the horizontal portion 26B of the pipe 26, and the check valve 38 is in a horizontal position.
In the siphon drainage system 10 of the present embodiment, the backflow prevention valve 38 is provided closer to the dishwasher 18 than in the first reference example. Can be suppressed. Other operations and effects of the siphon drainage system 10 shown in FIG. 9 are the same as those of the siphon drainage system 10 of the first reference example shown in FIG.

The siphon drainage system 10 as a reference example shown in FIG. 10 is a modified example of the siphon drainage system 10 shown in FIG. In the siphon drainage system 10 shown in FIG. 10, the ventilation device 58 is directly connected to the vertical portion 26A of the pipe 26. The operation and effect of the siphon drainage system 10 shown in FIG. 10 are the same as those of the siphon drainage system 10 shown in FIG.

[ Third Reference Example ]
Next, a siphon drainage system 10 according to a third reference example will be described with reference to FIG. Incidentally, the reference example described above, and the same reference numerals are given to the same configuration as the embodiment, and a description thereof will be omitted.

  In the siphon drainage system 10 shown in FIG. 11, the joint 24 with the check ring is provided in the horizontal portion 21 </ b> A of the pipe 21 disposed on the upstream side in the drain direction of the drain trap 22, and the check ring 38 is turned sideways. Is what it is.

In the siphon drainage system 10 of the present reference example , when drainage is performed from the dishwasher 18, the drainage pushes the air inside the pipe 29, and the inside of the pipe 26 may have a positive pressure. When the pressure inside the pipe 26 becomes positive, pressure acts on the sealing water 31 of the drain trap 22 from the downstream side in the drain direction, but the check valve 38 is provided upstream of the drain trap 22 in the drain direction. The backflow of the sealing water 31 to the kitchen sink 16 beyond the check valve 38 is suppressed, and the opening of the drain trap 22 is suppressed. Therefore, it is suppressed that the sealing water 31 blows out from the drain port 16A.
Other operations and effects are the same as those of the above-described reference example and the embodiment.

Siphon drainage system 10 as a reference example shown in FIG. 12 is a modification of a siphon drainage system 10 illustrated in FIG. 11. In the siphon drainage system 10 shown in FIG. 12, a joint 24 with a check valve is connected to a vertical portion 21B of a pipe 21. The operation and effect of the siphon drainage system 10 shown in FIG. 12 are the same as those of the siphon drainage system 10 shown in FIG.

[Other Embodiments]
As described above, one embodiment of the present invention has been described. However, the present invention is not limited to the above, and other than the above, it is needless to say that various modifications can be made without departing from the spirit of the present invention. It is.

In the above embodiment, the kitchen sink 16 corresponds to the first watering device of the present invention, and the dishwasher 18 corresponds to the second watering device of the present invention. The second water circulating device may be any device that drains water, and the type is not particularly limited. Examples of the water-supply device include a bath tub and a washing place provided in a bath such as a wash basin, a washing machine, and a unit bath, and a toilet. However, other devices may be used.
Further, in the above-described embodiment, the structure is such that drains from different water-supply devices such as the kitchen sink 16 and the dishwasher 18 are combined. However, drainage from the same water-supply device may be combined.
Further, in the above-described embodiment, the structure is such that the drainage from two water circulating devices is merged. However, the structure may be such that three or more water circulating devices are merged.

  Although the drain trap 22 of the above embodiment has a substantially S-shape, the drain trap 22 may be of any other type as long as it stores the sealed water. Can be used.

  Although the disposer 20 is provided in the siphon drainage system 10 of the above embodiment, the disposer 20 may not be provided.

Known vent valves can be used for the vent device 36 and the vent device 58, and the structure, shape, and the like are arbitrary .

In the above-described embodiment, the ventilation device 36 is a ventilation valve having a backflow prevention function capable of introducing outside air. However, the present invention is not limited to this, and any ventilation device that can introduce air into the pipe 26 and the siphon drain pipe 28. Instead of the ventilation device 36, one end of the pipe may be connected to the drain trap 22 or the pipe 26, and the other end of the pipe may be connected to the drain stack 32 or the like. In this case, the air in the drainage stack 32 can be introduced into the pipe 26 and the siphon drainage pipe 28 to suppress the negative pressure in the pipe 26.

  The position of the joint 24 with a check valve is not limited to the above embodiment. The joint 24 with a check valve may be provided between the drain 16A of the kitchen sink 16 and the joint 27.

  In the above embodiment, since the drain trap 22 and the joint 24 with the check valve are separate, the drain trap 22 and the joint 24 with the check valve are arranged at the optimum positions in the siphon drain structure 10. Therefore, the degree of freedom in designing the siphon drainage structure 10 can be increased. In addition, since the drain trap 22 and the joint 24 with the check valve are separate, the structure is not complicated.

Conventionally, in order to suppress pressure fluctuation, it is necessary to secure a certain level of capacity of the riser 32, and there is a limit on the lower limit of the inner diameter of the riser 32.
In the present invention, since the negative pressure generated in the water sealing by the ventilation valve and the positive pressure applied to the water sealing by the check valve can be suppressed, the standing pipe can be thinned, and the degree of freedom in designing the building can be reduced. It is possible to increase.

  10 siphon drainage system, 16 kitchen sink (first watering device), 16A drainage port, 18 dishwasher (second watering device), 21 pipe (first drainage introduction pipe), 26 ... pipe (first drainage introduction pipe), 28 ... siphon drainage pipe, 28A ... horizontal drawing pipe, 28B ... vertical pipe, 29 ... pipework (second drainage introduction pipe), 36 ... ventilation device (venting means), 38: check valve, 58: ventilation device (venting means)

Claims (4)

A first drainage introduction pipe that is provided downstream of the drainage port of the first watering device in the drainage direction and that allows drainage from the first watering device to flow;
A water ring type trap provided on the downstream side of the drainage direction in the drain direction and including a storage unit in which the sealed water is stored,
The drainage pipe is connected to the first drainage introduction pipe, and is provided downstream of the storage unit in the drainage direction to allow a flow of fluid to the drainage downstream in the drainage direction. A check valve for blocking the flow,
A lower end is connected to a pipe portion extending in the vertical direction on the upstream side in the drainage direction of the check valve and downstream of the storage portion, and is provided at an upper end of a pipe extending upward from the lower end, and Venting means for introducing air between the valve and the reservoir,
A horizontal drawing pipe provided downstream of the first drainage introduction pipe in the drainage direction, and configured to horizontally flow drainage from the first water supply device;
A vertical pipe that is provided on the drainage direction downstream side of the horizontal drawing pipe, and that vertically drops the drainage from the horizontal drawing pipe,
A siphon drainage structure. A second drainage inlet that is connected to the first drainage introduction pipe or the horizontal drawing pipe downstream of the water seal trap and the check ring valve in the drainage direction, and that allows drainage from a second water supply device to flow. The siphon drainage structure according to claim 1, comprising a tube. The siphon drainage structure according to claim 1 or 2, wherein the ventilation means is a ventilation valve. The check valve includes a tubular portion, a throttle portion extending from the tubular portion, and an on-off valve provided at a distal end portion of the throttle portion to make a surface contact with an elastic force to close a flow passage, and a valve. The siphon drainage structure according to any one of claims 1 to 3.

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