Siphon drainage system

Abstract

To suppress positive pressure in a drain pipe downstream of sealing water in a siphon drainage system equipped with a confluence section downstream of the sealing water of a drain trap.SOLUTION: A siphon drainage system comprises a first plumbing fixture, a second plumbing fixture, a sealed drain trap located downstream in the drainage direction of the first plumbing fixture, a siphon drain pipe located downstream in the drainage direction of the drain trap and comprising a horizontal pipe and a vertical pipe, and a confluence section located downstream in the drainage direction of a storage section that stores the sealed water of the drain trap, to which a drain pipe through which wastewater discharged from the second plumbing fixture flows is connected, and which has an outlet that discharges the wastewater downstream in the drainage direction within the drain trap.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to siphon drainage systems. [Background technology]

[0002] As a siphon drainage system, for example, the siphon drainage system described in Patent Document 1 is known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-169081 Summary of the Invention [Problem to be solved by the invention]

[0004] In a configuration where drainage from multiple plumbing appliances, such as the kitchen sink and the dishwasher, is combined downstream of a drain trap, when drainage is discharged from the dishwasher, positive pressure is created in the drain pipe downstream of the sealing water of the drain trap, causing air to enter the sealing water from downstream, resulting in an unpleasant gurgling noise or causing the sealing water to spray out into the sink from the drain trap, leaving room for improvement.

[0005] In consideration of the above, the present disclosure aims to suppress positive pressure in a drain pipe downstream of the seal water in a siphon drainage system having a confluence downstream of the seal water of a drain trap. [Means for solving the problem]

[0006] The siphon drainage system of the first aspect comprises a first plumbing fixture, a second plumbing fixture, a sealed drainage trap located downstream in the drainage direction of the first plumbing fixture, a siphon drainage pipe located downstream in the drainage direction of the drainage trap and comprising a horizontal pipe and a vertical pipe, and a confluence section located downstream in the drainage direction from a storage section that stores the sealed water of the drainage trap, to which a drainage pipe through which drainage discharged from the second plumbing fixture flows is connected, and which has an outlet that discharges the drainage toward the downstream side in the drainage direction within the drainage trap.

[0007] In the siphon drainage system of the first aspect, the wastewater discharged from the first plumbing fixture is discharged through the drain trap, horizontal pipe, and vertical pipe, and the wastewater falls down the vertical pipe in a full flow state, generating a siphon force, which allows for efficient drainage.

[0008] The wastewater discharged from the second plumbing fixture is discharged through the drain pipe, confluence, horizontal pipe, and vertical pipe, and as the wastewater falls through the vertical pipe in a full flow state, a siphon force is generated, which allows for efficient drainage.

[0009] Here, the wastewater from the second plumbing fixture is discharged into the drain trap from the outlet at the confluence, and because the wastewater is discharged from the outlet toward the downstream side of the drain trap in the drain direction, the air in the trap downstream of the storage unit in the drain direction also flows downstream along with the flow of the wastewater, preventing positive pressure from building up downstream of the seal water. Also, the wastewater is prevented from flowing back upstream of the drain trap.

[0010] The siphon drainage system of the second aspect is the siphon drainage system of the first aspect, further comprising a straightening member that is arranged upstream of the outlet in the drainage direction of the first plumbing fixture and downstream of the storage section in the drainage direction, and that directs the drainage from the first plumbing fixture downward beyond the outlet.

[0011] In the siphon drainage system according to the second aspect, when wastewater is discharged from the first plumbing fixture, the flow straightening member directs the wastewater downward from the discharge port and flows downstream in the drainage direction. This makes it possible to prevent dirt discharged from the first plumbing fixture from adhering to the discharge port.

[0012] The siphon drainage system of the third aspect is the siphon drainage system of the first or second aspect, wherein the drain trap is provided with a pressure buffering device that buffers the pressure in the pipe between the storage section and the outlet.

[0013] In the siphon drainage system of the third aspect, the drain trap is provided with a pressure buffer device that buffers the pressure in the pipe between the storage section and the discharge outlet. Therefore, for example, when a positive pressure occurs in the pipe downstream of the storage section, the pressure buffer device can buffer the positive pressure, thereby preventing the drain trap from breaking.

[0014] The siphon drainage system of the fourth aspect is a siphon drainage system of any one of the first to third aspects, in which a riser pipe extending vertically is provided between the drain trap and the horizontal pipe, and the drain trap is provided with an air vent valve that introduces outside air between the storage section and the discharge outlet.

[0015] In the siphon drainage system of the fourth aspect, when water is drained from the second plumbing fixture, a siphon force (self-siphoning) is generated in the riser pipe at the initial stage, i.e., before the water reaches the vertical pipe, making it easier to drain water from the second plumbing fixture at the initial stage.

[0016] In addition, when the drainage water from the second plumbing fixture falls into the riser pipe at full flow, negative pressure is created on the upstream side of the riser pipe, and this negative pressure acts on the seal water, causing it to be drawn downstream in the drainage direction, which may cause the drain trap to break.

[0017] In the siphon drainage system of the fourth aspect, when the upstream side of the riser pipe becomes negative pressure, outside air is introduced between the riser pipe and the storage section through the vent valve, which relieves the negative pressure acting on the seal water and prevents the drain trap from breaking. [Effects of the Invention]

[0018] As described above, according to the present disclosure, in a siphon drainage system having a confluence downstream of the seal water of a drain trap, positive pressure in the drain pipe downstream of the seal water can be suppressed. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a side view illustrating a siphon drainage system according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a side view showing the drainage system near the drain trap. [Figure 3] FIG. 2 is a vertical cross-sectional view showing the inside of the drain trap. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] FIG. 3 is a horizontal cross-sectional view showing the inside of the drain trap. [Figure 7] FIG. 1 is a cross-sectional view showing a pressure relief device. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In FIG. 1, the siphon drainage system 10 of this embodiment has a first drainage system 1, a second drainage system 2, a siphon drainage pipe 12, a water-sealed drainage trap 14, and a riser pipe 16. The first drainage system 1 is a piping structure for draining wastewater from a kitchen sink 18 as an example of a first plumbing device. The second drainage system 2 is a piping structure for draining wastewater from a dishwasher 20 as an example of a second plumbing device.

[0021] As shown in Figure 1, floor panels 24 are arranged at intervals on the slab 22 of the dwelling unit, and a kitchen sink 18 as a first plumbing device and a dishwasher 20 as a second plumbing device are arranged on the floor panels 24.

[0022] A garbage disposer 26 is attached to the drain outlet 18A of the kitchen sink 18. An elbow-shaped pipe 28, a water-sealed drain trap 14, and a riser pipe 16 extending vertically are connected to the downstream side of the garbage disposer 26 in the drainage direction in this order.

[0023] The riser pipe 16 passes through a hole 24A formed in the floor panel 24.

[0024] A siphon drain pipe 12 is arranged downstream in the drainage direction of the riser pipe 16. The siphon drain pipe 12 is composed of a horizontal pipe 12A that extends laterally and has the same inner diameter as the riser pipe 16, and a vertical pipe 12B that extends vertically.

[0025] The horizontal pipe 12A is placed on the slab 22, and the vertical pipe 12B of the siphon drain pipe 12 hangs down through a vertical hole 22A formed in the slab 22 and is connected to a drainage vertical pipe 30 extending vertically in the dwelling unit.

[0026] (Drain trap) As shown in FIGS. 2 and 3, the drain trap 14 of this embodiment is a so-called water-sealed trap that is substantially S-shaped when viewed from the side. The drain trap 14 has a first bent pipe section 32 which is approximately U-shaped and connects the lower end portion of the L-shaped pipe 28, and a second bent pipe section 34 which is approximately inverted U-shaped and connected downstream in the drainage direction of the first bent pipe section 32. In this embodiment, the portion of the first bent pipe section 32 where the seal water W (the two-dot chain line in FIG. 3 indicates the liquid surface) is stored is called a storage section 32A.

[0027] The second bent pipe section 34 has an arc section 34A and a vertical section 34B downstream in the drainage direction of the arc section 34A. The lower end of the vertical section 34B is connected to the upper end of the riser pipe 16 via a joint 36.

[0028] A tubular pressure relief device mounting portion 34C extending upward is integrally formed above the vertical portion 34B on the arc portion 34A of the second bent pipe portion 34. A pressure relief device 46, which will be described later, is connected to this pressure relief device mounting portion 34C.

[0029] Furthermore, the arcuate portion 34A of the second bent pipe portion 34 is provided with a confluence portion 34D downstream in the discharge direction of the arcuate portion 34A and on the radially outer side of the arcuate portion 34A.

[0030] The junction joint 38 shown in Figures 4 to 6 is connected to this junction section 34D. The junction joint 38 has a straight pipe section 38A extending in the horizontal direction, and a longitudinal middle section of the straight pipe section 38A has a A discharge portion 38B having an arc shape when viewed from above (in a plan view) and a discharge port 38Ba at its lower end is integrally formed.

[0031] In the confluence joint 38, a linear pipe line 38Aa with a circular cross section is formed inside the straight pipe section 38A, and a pipe line 38Bb with an arc-shaped cross section (see FIG. 6) is formed inside the discharge section 38B. The arc-shaped pipe line 38Bb has a center of curvature (not shown) on the second bent pipe section 34 side of the drain trap 14.

[0032] As an example, one end of straight pipe portion 38A is connected to a drain pipe 40 connected to dishwasher 20 via a joint 39. The other end of straight pipe portion 38A is closed with a cap 42. Note that drain pipe 40 connected to dishwasher 20 may be connected to one end of straight pipe portion 38A.

[0033] The wastewater discharged from dishwasher 20 flows into straight pipe portion 38A via drain pipe 40 and is discharged downward from the lower end of discharge portion 38B. An inclined surface 34Da is formed on the inner surface of the confluence portion 34D, which directs the wastewater discharged from the discharge portion 38B of the confluence joint 38 toward the upper end of the vertical portion 34B. In other words, the wastewater discharged from the discharge portion 38B flows obliquely downward along the inclined surface 34Da and flows into the vertical portion 34B.

[0034] As shown in FIG. 3, a finned member 44 is inserted into the pressure relief device mounting portion 34C. The finned member 44 includes a cylindrical portion 44A that is inserted into the pressure relief device mounting portion 34C, and a fin 44B, an example of a flow straightening member, is integrally formed at the lower end of the cylindrical portion 44A. The fin 44B protrudes from the inner peripheral wall of the arc portion 34A toward the center of the second bent pipe portion 34 and is inclined relative to the vertical direction so as to guide the wastewater flowing from the kitchen sink 18 toward the vertical portion 34B and point downward below the outlet 38Ba at the lower end of the discharge portion 38B of the junction joint 38. The fin 44B is formed with multiple ribs 45 that extend along the flow of the wastewater. The ribs 45 prevent debris in the wastewater from sticking to the fin 44B, or in other words, from sticking tightly to the fin 44B.

[0035] Fins 44B are disposed upstream of outlet 38Ba at the lower end of discharge portion 38B in the drainage direction of kitchen sink 18 and downstream of storage portion 32A in the drainage direction. Fins 44B serve to straighten the drainage water flowing from kitchen sink 18 so that it is less likely to flow into pressure relief device 46, which will be described later, and so that the water does not flow toward outlet 38Ba at the lower end of discharge portion 38B.

[0036] The finned member 44 is entirely made of an elastic material such as rubber or synthetic resin, and the fins 44B are elastically deformable. The elastic deformation of the fins 44B allows the crushed material passing through the finned member 44 to flow downstream without resistance.

[0037] (Pressure relief device and vent valve) As shown in FIG. 2, the pressure relief device mounting portion 34C is provided with a pressure relief device 46 and a vent valve 48. As shown in Figure 7, the pressure relief device 46 comprises a thin-walled, cylindrical elastic expansion body 50 made of an elastic material such as rubber, a lower support member 52 that supports the lower end side of the elastic expansion body 50, an upper support member 54 that supports the upper end side of the elastic expansion body 50, and a cover 56 that covers the elastic expansion body 50.

[0038] The lower end of the elastic expansion body 50 is clamped and fixed between the lower support member 52 and the ring 58, and the upper end of the elastic expansion body 50 is clamped and fixed between the upper support member 54 and the ring 60.

[0039] As shown in FIG. 3, the lower support member 52 is inserted into the pressure relief device mounting portion 34C of the drain trap 14, and the pressure relief device 46 is mounted to the drain trap 14.

[0040] When the pressure inside the drain trap 14 downstream of the storage section 32A in the drain direction increases, the elastic expansion body 50 expands, and the pressure relief device 46 can buffer the pressure (positive pressure). Note that "positive pressure" means a pressure higher than the outside air pressure in the environment in which the siphon drainage system 10 is located.

[0041] The vent valve 48 provided at the top of the pressure relief device 46 is in communication with the interior of the elastic expansion body 50. When negative pressure occurs inside the drain trap 14 downstream of the storage section 32A in the drainage direction, the vent valve 48 can take in outside air and prevent the drain trap 14 from breaking, specifically, preventing the accumulated seal water from being sucked downstream and disappearing due to negative pressure. The vent valve 48 is normally closed to prevent the leakage of odors, etc. A known vent valve (for example, the one described in JP 2009-299866 A) can be used as the vent valve 48. Note that "negative pressure" means a pressure lower than the outside air in the environment in which the siphon drainage system 10 is located.

[0042] (Second drainage system) In Fig. 1, second drainage system 2 is a piping structure for draining drainage water from dishwasher 20, which is an example of a second plumbing device. A pressure pump (not shown) is built into the drainage section of dishwasher 20, and the pressure pump is used to push the drainage water away.

[0043] (Action, effect) Next, the operation and effects of the siphon drainage system 10 of this embodiment will be described. First, when the kitchen sink 18 is used and wastewater is discharged from the kitchen sink 18, the wastewater passes through the disposer 26, the piping 28, the drain trap 14, and the riser pipe 16 to reach the siphon drain pipe 12.

[0044] When wastewater flows through the horizontal pipe 12A and the vertical pipe 12B of the siphon drain pipe 12, and when part of the vertical pipe 12B is filled with wastewater, the wastewater in the vertical pipe 12B falls due to gravity, and a siphon force corresponding to the head difference in the vertical pipe 12B is generated inside the vertical pipe 12B.

[0045] The wastewater in the horizontal pipe 12A is sucked toward the vertical pipe 12B by siphon force, and the horizontal pipe 12A and the vertical pipe 12B become filled with wastewater, increasing the flow rate and flowing down the horizontal pipe 12A and the vertical pipe 12B, and the wastewater from the kitchen sink 18 is efficiently discharged into the drainage vertical pipe 30.

[0046] Meanwhile, when wastewater is discharged from dishwasher 20, in the initial stage, the air in drain pipe 40 connected to dishwasher 20 is suddenly pushed by the wastewater discharged from dishwasher 20. Then, the air in drain pipe 40 flows into drain trap 14 via junction 34D.

[0047] As a result, in the drain trap 14, the internal pressure (air pressure) downstream of the storage section 32A where the seal water W is stored rises to a positive pressure, but the elastic expansion / contraction body 50 of the pressure relief device 46 expands to relieve the positive pressure caused by the air. This prevents the drain trap 14 from being broken by the positive pressure.

[0048] The wastewater from dishwasher 20 is discharged into drain trap 14 from outlet 38Ba of confluence 34D, and the wastewater is discharged from outlet 38Ba toward the downstream side in the drainage direction within drain trap 14. As a result, the air inside drain trap 14 downstream of storage 32A in the drainage direction also flows downstream along with the flow of the wastewater, preventing positive pressure from building up downstream of storage 32A (seal water W). In addition, the wastewater from dishwasher 20 is prevented from flowing back toward the upstream side of drain trap 14.

[0049] Thereafter, the wastewater pushed out from dishwasher 20 flows into riser pipe 16, and when the wastewater flows inside riser pipe 16 at full flow, a siphon force (self-siphoning) is generated in riser pipe 16 in the initial stage of drainage, i.e., before the wastewater reaches vertical pipe 12B, making it easier to drain the water from dishwasher 20 in the initial stage.

[0050] When the drainage water flows through the riser pipe 16, in the drainage trap 14 connected to the riser pipe 16, a negative pressure is created downstream of the storage section 32A where the seal water W is stored (between the seal water W and the discharge port 38Ba).

[0051] However, in the drain trap 14, the vent valve 48 is connected to the second bent pipe section 34 downstream of the storage section 32A via the pressure relief device 46, so when negative pressure occurs downstream of the storage section 32A, outside air is introduced through the vent valve 48 to relieve the negative pressure. This prevents the drain trap 14 from breaking due to negative pressure.

[0052] Thereafter, when the wastewater discharged from the dishwasher 20 flows through the horizontal pipe 12A and the vertical pipe 12B of the siphon drain pipe 12, the wastewater discharged from the dishwasher 20 is efficiently discharged into the drainage vertical pipe 30 by the siphon force of the vertical pipe 12B.

[0053] In addition, in the drain trap 14 of this embodiment, a fin 44B is provided upstream of the discharge outlet 38Ba in the drainage direction and downstream of the storage section 32A in the drainage direction, which directs the drainage from the kitchen sink 18 downward beyond the discharge outlet 38Ba.

[0054] This causes the wastewater from the kitchen sink 18 to flow downward from the outlet 38Ba and downstream in the drainage direction (in other words, downward), thereby preventing dirt contained in the wastewater from the kitchen sink 18 from adhering to the outlet 38Ba and its surroundings.

[0055] [Other embodiments] The above describes one embodiment of the present disclosure, but the present disclosure is not limited to the above, and it goes without saying that various modifications can be made to the present disclosure without departing from the spirit of the present disclosure.

[0056] In the above embodiment, the kitchen sink 18 corresponds to the first plumbing device of the present disclosure, and the dishwasher 20 corresponds to the second plumbing device of the present disclosure. However, the first plumbing device and the second plumbing device may be any device that drains water, and there are no particular limitations on the type. Examples of plumbing devices include a washbasin, a washing machine, a bathtub, and a washing area, but other devices may also be used.

[0057] In the siphon drainage system 10 of the above embodiment, the kitchen sink 18 is provided with a disposer 26, but the disposer 26 does not have to be provided.

[0058] In the above embodiment, a vent valve 48 was used to suppress negative pressure, but the present disclosure is not limited to this, and other configurations may be used instead of the vent valve 48 as long as they can introduce outside air to suppress negative pressure when negative pressure occurs in the piping downstream of the drain trap 14. For example, instead of the vent valve 48, one end of the piping may be connected to the pressure relief device 46, and the other end of the piping may be connected to the drainage stack 30 or the like. In this case, the air inside the drainage stack 30 can be introduced into the piping downstream of the drain trap 14 to suppress negative pressure in the piping.

[0059] The pressure relief device 46 and the vent valve 48 may be provided as needed, and may not be provided if the drain trap 14 can be prevented from breaking its seal. [Explanation of symbols]

[0060] 10...Siphon drainage system, 12...Siphon drain pipe, 12A...Horizontal pipe, 12B...Vertical pipe, 14...Drain trap, 16...Rising pipe, 18...Kitchen sink (first plumbing fixture), 20...Dishwasher (second plumbing fixture), 32A...Storage section, 34D...Confluence section, 38Ba...Outlet, 40...Drain pipe, 44B...Fin (straightening member), 46...Pressure buffer device, 48...Ventilation valve (ventilation section)

Claims

1. A first plumbing fixture; A second plumbing fixture; a water-sealed drain trap provided downstream in a drainage direction of the first plumbing fixture; A siphon drain pipe provided downstream of the drain trap in the drainage direction and including a horizontal pipe and a vertical pipe; a confluence section provided downstream in the drainage direction from a storage section that stores sealing water in the drain trap, to which a drain pipe through which drainage discharged from the second plumbing fixture flows is connected, and which has an outlet that discharges the drainage toward the downstream side in the drainage direction within the drain trap; Siphon drainage system with.

2. The siphon drainage system of claim 1 further comprises a straightening member arranged upstream of the outlet in the drainage direction of the first plumbing fixture and downstream of the storage section in the drainage direction, and directing the drainage from the first plumbing fixture downward beyond the outlet.

3. The drain trap is provided with a pressure buffer device that buffers the pressure in the pipe between the storage section and the discharge port. The siphon drainage system according to claim 1 or claim 2.

4. A riser pipe extending vertically is provided between the drain trap and the horizontal pipe, The drain trap has a vent valve between the storage section and the outlet for introducing outside air. It is provided, The siphon drainage system according to claim 1 or claim 2.

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