TW202136619A - Drainage pipe structure - Google Patents

Abstract

A drainage pipe structure includes: a first drainage system that drains drainage from a first water-surrounding device; a second drainage system that drains drainage from a dishwasher (second water-surrounding device); a siphon drainage pipe to which the first drainage system is connected at an upstream side and to which the second drainage system is connected further toward a downstream side than the first drainage system; and a pressure reducing pipe that is provided at the second drainage system, and that reduces drainage pressure in the second drainage system.

Description

Drainage pipe structure

The present invention relates to a drainage pipe structure.

Japanese Patent Laid-Open No. 2016-196744 (Patent Document 1) discloses a siphon drainage structure in which two water appliances (a kitchen counter and a dishwasher) are connected to one siphon drainage pipe. Specifically, the first drainage introduction pipe system for the drainage of the drainage from the kitchen counter is connected to the siphon drainage pipe through the drain trap and the check valve, and the second drainage that can be used for the drainage from the dishwasher. The introduction pipe system is connected to the first drainage introduction pipe on the downstream side of the above-mentioned drainage trap, or a horizontal pipe (siphon drainage pipe). The check valve prevents the drain from the dishwasher from flowing back to the kitchen counter.

In addition, Japanese Patent Application Laid-Open No. 2018-105035 (Patent Document 2) discloses a technique that uses a pressure relief device instead of a check valve in the same drainage structure to relax the pressure rise on the downstream side of the drainage trap.

In addition, there are models with lower drain pressure and larger models of dishwashers. It is considered that when the drainage pressure is high, the air in the pipe will be forced out to the side of the kitchen counter, causing the sealing water of the drainage trap to be destroyed due to the increase in pressure in the drainage pipe. Although the check valve described in Patent Document 1 described above can be used to suppress the general unblocking described above, there is a problem that the life of the check valve is affected by repeated opening and closing of the check valve. It is also considered that the pressure relief device described in Patent Document 2 is used instead of the check valve to relax the pressure rise in the drain pipe. However, the drain from the dishwasher will flow back to the side of the kitchen counter and reach the air inlet toward the pressure relief device. If the inlet is blocked by the backflow of drainage, it will be difficult to relax the drain pipe by the pressure relief device. The pressure inside rises.

The purpose of the present invention is to connect a siphon drain pipe to a drain pipe structure with multiple water appliances When draining water from the water equipment connected to the downstream side, it is possible to suppress the reverse flow to the upstream side of the water equipment side and the pressure increase on the side of the water equipment side.

The drainage pipe structure related to the first aspect has: the first drainage system, which allows the drainage from the first water machine; the second drainage system, which allows the drainage from the second water machine; and the siphon drainage pipe, The first drainage system is connected to the upstream side, and the second drainage system is connected to the downstream side of the first drainage system; the pressure reduction piping is installed in the second drainage system to reduce the second drainage system Drain pressure in the system.

In this drainage pipe structure, the drainage from the first water machine passes through the first drainage system and flows into the siphon drainage pipe. In addition, the drain from the second water appliance flows into the siphon drain pipe through the second drain system. In either case, the inside of the siphon drain pipe becomes full and generates a siphon force to attract the drain to the downstream side. Since the second drainage system is equipped with pressure reduction piping, even if the drainage pressure of the second water appliance is high and the flow of drainage is large, the pressure reduction piping can still reduce the drainage pressure and reduce the drainage speed. Therefore, when draining water from the second water appliance, it is possible to prevent the drain from flowing backward toward the first water appliance that is connected to the upstream side of the second water appliance.

The second aspect relates to the drainage pipe structure related to the first aspect, and the pressure reducing piping system has a bent pipe.

In this drainage pipe structure, when the drainage passes through the bent pipe, the drainage can cause a pressure loss. As a result, the drainage pressure can be reduced.

The third aspect is in the drainage pipe structure related to the first aspect, and the pressure-reducing piping system has a pipeline whose inner diameter changes to a small diameter.

In this drainage pipe structure, when drainage passes through a pipe whose inner diameter changes to a small diameter, the drainage can cause a pressure loss. As a result, the drainage pressure can be reduced.

The fourth aspect is in the drainage pipe structure related to the first aspect. The pressure-reducing piping system has branch pipelines that branch from upstream to downstream and whose ends are closed.

In this drainage pipe structure, a part of the drainage enters the branch pipe to hinder the flow of drainage and cause pressure loss in the drainage. As a result, the drainage pressure can be reduced.

The fifth aspect is that there is a temporary storage part in the drainage pipe structure related to any of the first to fourth aspects. The temporary storage part is installed in the second drainage system, and the inlet is set higher than the outlet At the position of the second drainage system, the volume per unit length formed in the second drainage system will be partially enlarged, And the up and down direction is a cylindrical shape with the axis direction; the inlet is formed into a cylindrical shape with the transverse direction as the axis direction; the axis of the inlet is eccentric with respect to the axis of the temporary storage part; the outlet is It is formed into a cylindrical shape with the transverse direction as the axis direction; the axis of the outlet is not eccentric with respect to the axis of the temporary storage part.

In this drainage pipe structure, since the entrance of the temporary storage part is formed in a cylindrical shape with the transverse direction as the axis, and the axis of the entrance is eccentric with respect to the axis of the temporary storage part, temporary storage is likely to occur Replacement of the air and drainage in the section to allow the drainage to flow smoothly into the temporary storage section. Thereby, the discharge of air from the temporary storage part is suppressed. Also by this, it is possible to reduce the inflow of air to the first hydraulic appliance side, and suppress the pressure increase on the first hydraulic appliance side.

In addition, the outlet of the temporary storage part is formed in a cylindrical shape with the transverse direction as the axis direction. Since the axis of the outlet is not eccentric with respect to the axis of the temporary storage part, the drainage flowing into the temporary storage part becomes Easy to gather at the exit. As a result, the drainage from the outlet will flow smoothly.

The sixth aspect is in the drainage pipe structure related to any of the first to fifth aspects. The second drainage system between the pressure reduction piping and the siphon drainage pipe will drop first. The upright part that rises again.

In this drainage pipe structure, since the upright part of the pressure reducing pipe and the siphon drainage pipe in the second drainage system is filled with drainage, the pipeline from the upright part to the siphon drainage pipe can be kept low in air. Thereby, when draining water from the second water appliance next time, the inflow of air to the first water appliance side can be reduced, and the pressure increase on the first water appliance side can be suppressed.

The seventh aspect is in the drainage pipe structure related to any of the first to sixth aspects. The first drainage system is provided with a first drainage trap; the first drainage trap has: an inflow part, which is available for The inflowing drainage flows downward; the first descending curved pipe section is arranged below the inflow section, and is bent downward from the upper side of the vertical direction to the horizontal direction; the first ascending curved pipe section is arranged on the first descending The drainage downstream side of the curved pipe section is bent upward from the horizontal direction to the upper side in the vertical direction; the second ascending curved pipe section is arranged on the downstream side of the first ascending curved pipe section in the drainage direction, and from the lower side in the vertical direction It is bent upward toward the horizontal direction; the second descending curved pipe portion is provided on the downstream side of the second ascending curved pipe portion in the drainage direction, and is curved downward from the horizontal direction to the lower side in the vertical direction; and a pressure relief device, It is arranged on the upper side of the second descending curved pipe portion, and communicates with the second descending curved pipe portion to alleviate the pressure in the pipe.

In this drainage pipe structure, when the drainage flows into the inflow portion, the drainage will pass through the first descending curved pipe section, the first ascending curved pipe section, the second ascending curved pipe section, and the second descending curved pipe section to be passed to the downstream side. discharge. The drained water stays in the bent portion formed by the first descending curved pipe portion and the first ascending bent pipe portion, and the stagnant drained water becomes sealed water.

For example, when the downstream side of the tube trap is instantly above atmospheric pressure, in other words, it becomes a positive pressure momentarily, the air on the downstream side of the tube trap will press the sealing water from the downstream side, and the sealing water will flow back toward the inflow part. . However, the pressure of the air that is going to flow backwards toward the inflow part due to the compression of the sealing water will be relieved by the pressure relief device installed on the downstream side of the drainage direction of the sealing water, so the pressure acting on the sealing water will be less pressure-free The condition of the mitigation device becomes smaller to suppress unblocking.

Here, in the second descending curved pipe portion of the pipe trap, the drain will flow as if it is about to fall from the upper side to the lower side. Since the pressure relief device is arranged on the upper side of the second descending curved pipe portion, when the drainage flows to the second descending curved pipe portion, it is difficult for the drainage to flow into the pressure relief device. Therefore, it becomes difficult for foreign matter such as dirt in the drainage to enter the pressure relief device.

The eighth aspect is in the drainage pipe structure related to the seventh aspect, and above the pressure relief device is provided with a vent that can introduce air from the outside to the downstream side of the sealed water part of the first drain trap .

In this drainage pipe structure, a vent is provided on the downstream side of the sealing part of the first drainage trap. Therefore, when a siphon force is generated and negative pressure is generated on the downstream side of the first drainage trap, the ventilation can be achieved. To introduce outside air. Thereby, it is possible to suppress unsealing at the first drain trap.

The ninth aspect is in the drainage pipe structure related to the seventh aspect or the eighth aspect, and the wiring at the upstream end of the axis of the first ascending curved pipe portion in the drainage direction is relative to the axis of the inflow portion Have an angle.

In this drainage pipe structure, the connection line at the upstream end of the axis of the first ascending curved pipe portion in the drainage direction has an angle with respect to the axis of the inflow portion. Therefore, the flow direction of the drainage from the inflow portion to the first ascending curved pipe portion will be greater than that of the line at the end of the drainage direction upstream of the axis of the first ascending curved pipe portion with respect to the axis of the inflow portion. The pipeline changes abruptly, causing the flow path resistance to increase. This flow channel resistance will not only act on the normal flow of drainage, but also act on the reverse flow of drainage.

According to the present invention, in a drainage pipe structure in which a siphon drainage pipe is connected to a plurality of water appliances, when the water is drained from the water appliance connected to the downstream side, it is possible to suppress the reverse flow toward the upstream side of the water appliance and the water appliance The pressure on the side rises.

1: The first drainage system

2: 2nd drainage system

10: Drainage pipe structure

12: Floor

14: Floor

16: kitchen counter

16A: Drain

18: dishwasher

20: processor

22: Piping

24: Water-sealed tube trap

26: Piping

28: Confluence connector

30: siphon drain

30A: Transverse tube

30B: Standpipe

32: Longitudinal hole

34: Drain standpipe

65: Pressure adjustment device

66: Pressure Relief Device

90: check valve

110: Vent valve

202: Primary drainage trap

203: Secondary drain trap

204: Temporary Storage

206: Pressure reduction piping

208: Upright

210, 212: Piping

Fig. 1 is a cross-sectional view showing a part of a building to which a drainage pipe structure related to an embodiment of the present invention is applied.

Fig. 2 is a side view showing the pipe trap used in the drainage pipe structure of the present invention.

FIG. 3A is a cross-sectional view along the axis of the tube trap shown in FIG. 2. FIG.

Figure 3B is a cross-sectional view along the axis of the tube well.

Figure 4 is a cross-sectional view showing the pressure relief device, the check valve and the ventilation device.

Fig. 5 is a cross-sectional perspective view showing a part of the pressure relief device.

Fig. 6 is a cross-sectional view showing the elastic expansion and contraction body of the pressure relief device.

Fig. 7 is a cross-sectional view showing a part of a check valve related to a modification.

Fig. 8 is a cross-sectional view showing the pressure relief component related to the modification.

Fig. 9 is a cross-sectional view showing the temporary storage part, the pressure reducing pipe, and the upright part.

Fig. 10 is a perspective view showing the temporary storage part.

Fig. 11 shows a front view of the temporary storage unit.

Fig. 12 is a perspective view showing Modification 1 of the pressure reducing pipe.

Fig. 13 is a longitudinal sectional view showing Modification 1 of the pressure reducing pipe.

Fig. 14 is a cross-sectional view showing Modification 1 of the pressure reducing pipe.

Fig. 15 is a longitudinal sectional view showing Modification 2 of the pressure reducing pipe.

Fig. 16 is a longitudinal sectional view showing Modification 3 of the pressure reducing pipe.

Figure 17 is a cross-sectional view schematically showing the role of the second drainage system in the drainage pipe structure.

Fig. 18 is a cross-sectional view schematically showing the functions of the temporary storage part and the upright part.

Fig. 19 is a cross-sectional view showing the rectifier assembly related to the second modification.

Fig. 20 is a side view showing the rectifier assembly related to the second modification.

Fig. 21 is a bottom view showing the rectifier assembly related to the second modification.

Fig. 22 is a perspective view showing the pressure relief device related to the second modification.

Fig. 23 shows a cross-sectional view along the axis of the pressure relief device related to the second modification.

Figure 24 is a perspective view showing the pressure relief device with the cover removed.

Fig. 25(A) is a perspective view showing the elastic expansion and contraction body, and Fig. 25(B) is a cross-sectional view along the axis of the elastic expansion and contraction body (Fig. 25(B) 25(B)-25(B) line sectional view) ).

Figure 26(A) shows a plan view of the elastic expansion and contraction body viewed from the axial direction, and Figure 26(B) shows a cross-sectional view at right angles to the axis of the elastic expansion and contraction body (Figure 26(B) of 26(B)-26) (B) line cross-sectional view), Fig. 26(C) shows a cross-sectional view at right angles to the axis of the elastic expansion and contraction body in a negative pressure state.

Fig. 27 is a perspective view showing a cross-section of the elastic expansion and contraction body with the lower support assembly and the upper support assembly installed.

Fig. 28 is a perspective view showing the first half-division component and the second half-division component.

Fig. 29(A) is a perspective view showing the valve body in a normal state, and Fig. 29(B) is a perspective view showing the valve body which floats to close the opening of the valve seat due to the drainage of the reverse flow.

Hereinafter, the modes for implementing the present invention will be described based on the drawings. In the drawings, the constituent elements shown with the same symbols mean the same or the same constituent elements. In addition, in the embodiments described below, overlapping descriptions and symbols may be omitted.

In Fig. 1, the drainage pipe structure 10 related to this embodiment has the first drainage system 1, the second drainage system 2, the siphon drainage pipe 30, the pipe well 24 as the first drainage trap, and the primary drainage trap as the second drainage trap. The drain trap 202, the temporary storage portion 204, the pressure reducing pipe 206, and the upright portion 208.

The first drainage system 1 is a piping structure through which drainage from a kitchen flow table 16 as an example of the first water appliance can circulate. In addition, the second drainage system 2 is a piping structure through which drainage from the dishwasher 18 as an example of the second water appliance can circulate.

As shown in Figure 1, the upper part of the floor 12 of the residence is arranged with a floor 14 spaced apart, and the upper part of the floor 14 is arranged with a kitchen counter 16 as a first water appliance and a dishwashing machine as a second water appliance.机18.

A processor 20 is installed at the drain port 16A of the kitchen counter 16. A pipe 22, a water-sealed pipe trap 24, and a pipe 26 are connected to the downstream side of the processor 20 in the drainage direction.

On the downstream side of the pipe 26 in the drainage direction, a confluence joint 28 and a siphon drainage pipe 30 are arranged. Siphon The drain pipe 30 is configured to include a horizontal pipe 30A and a vertical pipe 30B having the same inner diameter as the pipe 26.

The end of the pipe 26 on the downstream side in the drainage direction is a horizontal pipe 30A to which the siphon drainage pipe 30 is connected through the junction joint 28. In addition, a pipe 210 through which the drain water from the dishwasher 18 described later is discharged is connected to the confluence joint 28.

The horizontal pipe 30A is arranged above the floor 12, and the vertical pipe 30B of the siphon drainage pipe 30 hangs down through the vertical hole 32 formed in the floor 12, and is connected to the vertical drainage pipe 34 extending in the vertical direction of the residence.

(Tube trap)

As shown in FIG. 2, the tube trap 24 of this embodiment has a slightly S-shaped shape when viewed from the side, and is a so-called water-sealed trap. In addition, the tube trap 24 of this embodiment is connected to a pressure adjusting device 65 described later.

As shown in FIG. 3A, the tube well 24 of this embodiment is provided with an inflow-side piping connecting portion 36 that connects the lower end portion of the piping 22, a first curved pipe portion 38 having a substantially U-shape, and a first curved pipe formed on the first curved pipe. The vertical pipe portion 40 on the downstream side of the drainage direction of the portion 38, the second curved pipe portion 42 formed on the downstream side of the vertical pipe portion 40 in the drainage direction and having a slightly reverse U shape, and the drainage direction of the second curved pipe portion 42 The reduced-diameter pipe portion 44 on the downstream side and the discharge-side pipe connection portion 46 formed on the downstream side of the reduced-diameter pipe portion 44 in the drainage direction and connected to the upper end portion of the pipe 26.

The inflow-side pipe connection portion 36 is formed in a cylindrical shape whose axis is the vertical direction. As an example, the inflow-side pipe connection portion 36 has an inner diameter D1 into which the lower end portion of the pipe 22 with a nominal diameter of 30A can be inserted.

A male screw 36A is formed on the outer periphery of the upper end side of the inflow-side pipe connection portion 36, and the male screw 36A is screwed with a female screw 48A that fixes the ring nut 48 of the pipe 22.

A step portion 36B is formed at the end portion of the inflow-side pipe connection portion 36 on the downstream side in the drainage direction. The step portion 50 is in contact with the lower end portion of the pipe 22 inserted into the inflow-side pipe connection portion 36.

The inner diameter of the first curved pipe portion 38 is gradually reduced toward the downstream side in the drainage direction, and the inner diameter D2 at the end of the drainage inflow side is the same as the inner diameter of the pipe 22 (for example, φ30mm). The inner diameter D3 at the end of the discharge side is φ25mm as an example.

In addition, in the first curved pipe portion 38, a portion that is bent laterally and downwardly from above on the upstream side in the drainage direction is referred to as the first descending curved pipe portion 38A, and the portion on the downstream side in the drainage direction is upwardly curved from the lateral direction. The upwardly bent portion is referred to as the first ascending and bending pipe portion 38B.

Here, the line L1 at the upstream end of the axis 38CL of the first curved pipe portion 38 in the drainage direction is relative to the axis 36CL of the inflow-side pipe connection portion 36 (and the axis of the pipe 22 inserted into the inflow-side pipe connection portion 36 22CL is coaxial) and has an angle θ1 and crosses.

Therefore, compared to the case where there is no angle θ1 and crosses, the drainage flowing from the inflow-side pipe connection portion 36 (pipe 22) to the first curved pipe portion 38 receives resistance.

In other words, when the gas tries to flow from the first curved pipe portion 38 to the inflow-side pipe connection portion 36 (pipe 22), the gas will also receive resistance. Here, although the explanation is given as "drainage is subject to resistance", it is an explanation compared with the case where there is no angle θ 1 and intersecting. In fact, when draining water from the kitchen counter 16 It will not be a problem.

When the radius of curvature of the axis 38ACL of the first descending curved tube portion 38A is R1, and the radius of curvature of the axis of the first ascending curved tube portion 38B is R2, then R1>R2. The radius of curvature R1 and the radius of curvature R2 are respectively a single radius of curvature.

In addition, the upstream end in the drainage direction of the first curved pipe portion 38 (the portion described in the inner diameter D2) is located lower than the downstream end in the drainage direction (the portion described in the inner diameter D3).

A cylindrical cleaning port 52 is provided at the lower end of the first curved pipe portion 38. A male thread 52A is formed on the outer periphery of the cleaning port 52. By screwing and locking the female thread 54A of the cover 54 to the male thread 52A, the cover 54 is mounted on the cleaning port 52 to close the cleaning port 52. In addition, in this embodiment, although the cleaning port 52 is provided at the lower end of the first curved tube portion 38, the cleaning port 52 may be provided as needed, or may not be provided.

The vertical pipe portion 40 arranged on the downstream side of the first ascending curved pipe portion 38B in the drainage direction has a cylindrical shape, and has the axis 40CL as the vertical direction. The inner diameter D4 of the vertical pipe portion 40 is the same inner diameter (φ25 mm) as the inner diameter D3 at the drain discharge side end of the first curved pipe portion 38.

In addition, the axis 40CL of the vertical pipe portion 40 is coaxially aligned with the line L2 at the downstream end of the axis 38CL of the first ascending curved pipe portion 38B in the drainage direction.

The second curved pipe portion 42 arranged on the downstream side of the vertical pipe portion 40 in the drainage direction has an inner diameter that gradually decreases in diameter toward the downstream side in the drainage direction.

In the second curved pipe portion 42, a portion that is bent laterally and upwardly from below on the upstream side in the drainage direction is used as the second ascending curved pipe portion 42A, and is bent downwardly from laterally downward on the downstream side in the drainage direction. The part is referred to as the second descending curved pipe portion 42B.

The inner diameter D5 of the drain inflow side end of the second curved pipe section 42 (the connection part with the vertical pipe section 40) is the same inner diameter as the inner diameter D4 of the vertical pipe section 40, and the drainage of the second curved pipe section 42 is discharged side end portion (reduced diameter portion 44 of the pipe connection portion) to give an example of an inner diameter D6 φ 20mm.

The radius of curvature of the axis 42CL of the second curved tube portion 42 is R3. The line L3 at the upstream end of the axis 42CL of the second curved pipe portion 42 in the drainage direction and the axis 40CL of the vertical pipe portion 40 do not have an angle but are coaxially aligned (overlapped).

A cylindrical pressure relief device attachment portion 56 that extends to the upper side in the vertical direction and opens upward is integrally formed in the middle portion in the drainage direction of the second descending curved pipe portion 42B. A male thread 56A is formed on the outer periphery of the pressure relief device mounting portion 56. The male thread 56A is screwed with a female screw cap 57 that will fix the annular nut 57 of the insertion tube portion 82 of the pressure relief device 66 of the pressure regulator 65 described later. Thread 57A.

A rectifying assembly 58 is inserted into the pressure relief device mounting part 56. The rectifying assembly 58 is provided with a cylindrical part 58A inserted into the pressure relief device mounting part 56, and the lower end of the cylindrical part 58A is integrally formed with the fin part 58B. The fin portion 58B protrudes inside the second descending curved pipe portion 42B, and is inclined with respect to the vertical direction so as to guide the drainage direction flowing from the upstream side toward the reduced-diameter pipe portion 44 side. In other words, the fin 58B makes it difficult for the drainage flowing from the upstream side to flow into the pressure relief device 66 side described later.

The reduced-diameter pipe portion 44 provided on the downstream side of the drainage direction in the drainage direction of the second descending curved pipe portion 42B has a cylindrical shape whose inner diameter gradually decreases toward the downstream side in the drainage direction, and has an axis 44CL as the vertical direction. The inner diameter of the drain inflow side end of the reduced diameter pipe portion 44 (the connection part with the second descending curved pipe portion 42B) is the same as the inner diameter D6 of the downstream end of the second descending curved pipe portion 42B in the drainage direction. path. On the other hand, the inner diameter D7 of the drain discharge side end of the reduced-diameter pipe portion 44 is φ16 mm, for example.

In addition, the line L4 at the downstream end of the axis 42CL of the second curved pipe portion 42 in the drainage direction and the axis 44CL of the reduced-diameter pipe portion 44 do not have an angle but are coaxially aligned (overlapped).

The downstream side of the reduced-diameter pipe portion 44 in the drainage direction is provided coaxially with the cylindrical reduced-diameter pipe portion 44. In addition, the end portion of the discharge-side piping connection portion 46 on the upstream side in the drainage direction is formed with a step portion 47 that is reduced in diameter toward the reduced-diameter pipe portion 44. The step portion 47 is in contact with the upper end portion of the pipe 26 inserted into the discharge side pipe connection portion 46.

A male thread 46A is formed on the outer periphery of the lower end side of the discharge side pipe connection portion 46, and the male thread 46A is screwed with a female thread 64A that fixes the ring nut 64 of the pipe 26. In addition, as an example, the discharge side pipe connection portion 46 of this embodiment has an inner diameter D8 into which a pipe 26 with a nominal diameter of 20A can be inserted.

The pipe trap 24 stores a part of the drain water discharged from the kitchen counter 16 as sealing water in the inflow-side pipe connection portion 36, the first curved pipe portion 38, the vertical pipe portion 40, and the second curved pipe portion 42. In addition, the two-dot chain line indicated by the symbol Ws in FIG. 3A indicates the sealing water surface at the normal time.

In addition, the height of the liquid surface Ws of the normal sealing water stored in the tube well 24 is consistent with the height position of the uppermost end Pt of the inner flow channel wall surface inside the bending radius of the second curved tube portion 42. Suppose that if the liquid level Ws of the drainage rises higher than the uppermost end Pt, the drainage will exceed the uppermost end Pt and flow toward the downstream side in the drainage direction, and finally the ground liquid level Ws will still coincide with the height position of the uppermost end Pt. .

In addition, as shown in FIG. 3B, in the pipe well 24 of this embodiment, the sealing water depth h of the sealing water refers to the lowermost end Pu of the upper inner peripheral surface 38UF of the pipe of the slightly U-shaped first curved pipe portion 38 The dimension measured in the vertical direction to the uppermost end Pt of the inner flow channel wall surface inside the bending radius of the second curved pipe section 42. In addition, the sealing water depth h is a dimension (for example, 50 mm or more) determined by specifications (for example, drainage equipment technical standards) in order to suppress the unsealing of the pipe trap 24.

In the pipe trap 24, the end on the drain inflow side (that is, the height position of the upper end 36T on the upstream side of the drain direction of the inflow piping connection portion 36) is preferably installed in the most piping of the first curved pipe portion 38. Between the lower end portion Pb and the uppermost end portion Pt of the second curved pipe portion 42. In the present embodiment, the height position of the upper end portion 36T of the inflow-side pipe connection portion 36 is positioned at the same height as the height position of the uppermost end portion Pt of the second curved pipe portion 42.

(Pressure adjustment device)

The pressure adjusting device 65 of this embodiment is configured to include a pressure relief device 66, a check valve 90, and a vent valve 110. As shown in Figures 4 and 5, the pressure relief device 66 installed in the pressure relief device mounting portion 56 is configured to include a thin-walled elastic expansion and contraction body 68 formed of an elastic material such as rubber, which supports the elastic expansion and contraction body. The lower support member 70 on the lower end side of the 68, the upper support member 72 on the upper end side that supports the elastic expansion and contraction body 68, and the cover 74.

The elastic expansion and contraction body 68 has a free cross-sectional shape and is formed into a cylindrical expansion and contraction portion 68A having a substantially cross shape as shown in FIG. 6. Both ends of the expansion and contraction portion 68A in the axial direction are integrally formed with a radial direction An annular base portion 68B extending outside, and an outer peripheral portion of the base portion 68B is integrally formed with a ring-shaped mounting portion 68C for mounting the elastic expansion and contraction body 68 on the lower support assembly 70 and the upper support assembly 72. In addition, a thick rib 68D is formed at the end of the attachment portion 68C.

As shown in FIGS. 4 and 5, the mounting portion 68C on the lower side of the elastic expansion and contraction body 68 is held and fixed between the lower support assembly 70 and the cover 74, and the rib 68D is inserted into the outer periphery of the lower support assembly 70 The ring-shaped groove 78 formed.

In addition, the mounting portion 68C on the upper side of the elastic expansion and contraction body 68 is pinched and fixed between the upper support assembly 72 and the cover 74, and the rib 68D is inserted into the annular groove 78 formed by the outer periphery of the upper support assembly 72.

A tapered through hole 80 is formed in the center of the lower support assembly 70, and an insertion tube 82 communicating with the through hole 80 protrudes downward in the center of the lower side. As shown in FIG. 3A, the insertion tube portion 82 is inserted into the pressure relief device attachment portion 56 of the tube well 24, and the pressure relief device 66 is attached to the tube well 24.

As shown in FIG. 4, a tapered through hole 84 is formed in the center of the upper support assembly 72, and a cylindrical check valve mounting portion 86 that is communicated with the through hole 84 is projected upward in the center of the upper side. A male screw 86A is formed on the outer periphery of the check valve mounting portion 86.

(Check valve)

As shown in FIG. 4, the check valve 90 is attached to the check valve attachment part 86 of the pressure relief device 66. As shown in FIG.

The check valve 90 is configured to include a cylindrical body 92, a spherical valve body 94, a lid body 96, and the like. A female thread 92A is formed on the inner periphery of the lower part of the main body 92, and the male thread 86A of the check valve mounting part 86 of the pressure relief device mounting part 56 is screwed and locked to the female thread 92A to fix the check valve 90 is installed in the pressure relief device 66.

The inside of the main body 92 is formed with a partition wall 98 that divides the inside into upper and lower parts, and the center of the partition wall 98 is integrally formed with a dome-shaped valve body support part 100 that protrudes upward. The valve body support part 100 prevents the valve body 94 from moving downward so that the valve body 94 does not fall to the pressure relief device 66 below.

The partition wall 98 is formed with a plurality of through holes 102 on the radially outer side of the valve body supporting portion 100. The through hole 102 can communicate with the space on the upper side and the space on the lower side of the partition wall 98 to allow drainage and air to pass therethrough.

The specific gravity of the spherical valve body 94 is set so that when the drainage passes through the through hole 102 and flows into the space above the partition wall 98, it will float on the drainage.

The cover 96 is formed with a female thread 96A capable of screwing the male thread 92B formed on the upper outer periphery of the main body 92. By screwing and locking the female thread 96A to the male thread 92B, the cover 96 is mounted on the body 92.

The cover 96 is provided with a valve seat 104, and a valve hole 106 is formed in the center of the valve seat 104. The valve hole 106 is blocked by the valve body 94 floating on the drain. Therefore, even if the drain water enters the pressure relief device 66, the drain can be prevented from flowing out above the check valve 90. In addition, the check valve 90 can be set as needed or not.

A vent valve 110 is installed on the upper part of the check valve 90. The vent valve 110 of this embodiment is installed in a drain trap or a drain pipe. Since it has a general structure, the description of the structure is omitted. In addition, the vent valve 110 sucks in external air when the downstream side in the drainage direction becomes negative pressure, and the unsealing of the pipe trap 24 can be suppressed (the retained sealing water is sucked to the downstream side in the drainage direction and disappears due to the negative pressure).

The vent valve 110 will inhale the atmosphere to protect the sealing water of the pipe trap 24 when draining water, and will close the valve in normal times to prevent malodorous leaks and the like. A well-known valve (for example, the one described in JP 2009-299866 A) can be used for the vent valve 110.

In addition, "negative pressure" means the outside air whose pressure is lower than the environment in which the drainage pipe structure 10 is arranged.

(The first modification of the pressure relief device)

FIG. 7 shows a pressure relief device 120 having a different structure from the pressure relief device 66 shown in FIG. 4. The pressure relief device 120 shown in FIG. 7 basically has the same structure as the pressure relief device 66 shown in FIG. 4, and only some of the shapes and parts are different. In addition, even if the shape is different, the structure which is basically the same is given the same reference numeral, and the description thereof is omitted.

The elastic expansion and contraction body 68 of the pressure relief device 120 of this embodiment has a cylindrical shape in a free state shown by a two-dot chain line. When the internal pressure rises, it can move in the radial direction as shown by a solid line. The outer side elastically deforms and bulges to relieve pressure.

The attachment portion 68C of the elastic expansion and contraction body 68 is fixed by a ring 122 arranged on the outer peripheral side. In addition, the upper support member 72 on the upper end side that supports the elastic expansion and contraction body 68 and the lower support member 70 on the lower end side that supports the elastic expansion and contraction body 68 are connected by a cylindrical support member 124. In addition, the support assembly 124 is configured to be divided into two in the radial direction, and can be connected and opened and closed by a hinge (not shown in the figure).

(The first modification of the check valve)

In addition, in the check valve 90 shown in FIG. 4 and the check valve 90 shown in FIG. 7, although the valve body 94 is spherical, the valve body 94 may have a large diameter portion as shown in FIG. 8 as an example. The shape of 112A and the cylindrical valve body 112 that will enter the small diameter portion 112B of the valve hole 106 is not limited. By adopting the above-mentioned shape, the effect of being able to stop the water from the upper surface of the large-diameter portion 112A can be achieved. Since the water stop is not performed by dots like a sphere, the water stop function can be improved.

(Second drainage system)

In Fig. 1, the second drainage system 2 is a piping structure through which drainage from the dishwasher 18 as an example of the second water appliance can flow. A pressure pump (not shown in the figure) is built in the drainage part of the dishwasher 18, and the pressure pump is used to push the drainage to make it flow. The dishwasher 18 or the second drainage system 2 is provided with a primary drainage well 202 as a second drainage well. The second drainage system 2 is provided with, for example, a secondary drainage trap 203 as a third drainage trap, a temporary storage portion 204, a pressure reducing pipe 206, and an upright portion 208. In FIG. 1, the primary drain trap 202 is built in the dishwasher 18. In addition, the primary drainage trap 202 can also be provided in a second drainage system 2 different from the dishwasher 18. In this case, the secondary drainage well 203 can also serve as the primary drainage well 202.

The second drainage system 2 is connected to the horizontal pipe 30A of the siphon drainage pipe 30 on the downstream side of the first drainage system 1. Specifically, the cross pipe 30A is provided with a junction 28 on the downstream side of the first drainage system 1, and the pipe 210 on the downstream side of the upright portion 208 in the second drainage system is connected to the junction 28.

The secondary drain trap 203 is a U-shaped pipe trap provided between the primary drain trap 202 in the second drainage system 2 and the temporary storage part, and is, for example, a U-shaped tube trap that is convexly bent downward. The piping 212 on the downstream side of the secondary drain trap 203 extends upward and then extends laterally to be connected to the inlet 204A of the temporary storage portion 204.

(Temporary Storage Department)

In FIG. 9, the temporary storage portion 204 is installed in the second drainage system 2, and the inlet 204A is installed at a position higher than the outlet 204B. The volume per unit length in the second drainage system 2 is partially enlarged. In other words, the temporary storage part 204 is a chamber that can temporarily store drainage. The temporary storage portion 204 is formed, for example, in a cylindrical shape (for example, a cylindrical shape or a square cylindrical shape) with the vertical direction as the axis direction. Specifically, the temporary storage portion 204 is configured to include a cylindrical body portion 214, an upper body 216, and a lower body 218. The upper body 216 has large diameter portions 216A and 216B at the upper end and the lower end, respectively. Body The inner diameter of 214 is set to be larger than the inner diameter of pipe 212. The large-diameter portion 216A at the upper end is detachably fitted with, for example, the cover assembly 220. In Fig. 10, the cover assembly 220 (Fig. 9) is detached. By removing the cover assembly 220 in this way, the large-diameter portion 216A is formed with an opening 216D. This opening can be used as a cleaning port. In addition, the cover assembly 220 may not be provided, and the upper end of the upper body 216 (temporary storage portion 204) may be closed.

The large diameter portion 216B at the lower end is fitted with, for example, the upper end of the main body portion 214. A small diameter part 216C is provided between the large diameter parts 216A and 216B. The entrance 204A of the temporary storage part 204 is provided in the small diameter part 216C. As shown in FIG. 11, the entrance 204A uses the lateral direction as the axis direction, and the axis X1 of the entrance 204A is eccentric with respect to the axis Z of the temporary storage portion 204.

The upper end of the lower body 218 is provided with a large-diameter portion 218A. The large-diameter portion 218A is fitted with, for example, the lower end of the main body portion 214. The outlet 204B of the temporary storage portion 204 is provided at the lower end of the lower body 218, and the transverse direction is the axial direction. As shown in FIG. 11, the axis X2 of the outlet 204B is not eccentric with respect to the axis Z of the temporary storage portion 204.

As shown in FIG. 9, in the temporary storage portion 204, the inner surface 218B opposite to the outlet 204B in the axial direction of the outlet 204B is curved, so that when the drainage is discharged from the temporary storage portion 204, the drainage Toward the exit 204B side. In other words, the lateral distance between the inner surface 218B and the outlet 204B will decrease as it goes downward. As long as they have the same structure, the inner surface 218B may be an inclined surface, a combination of an inclined surface and a curved surface, or the like.

(Pressure reduction piping)

In FIG. 9, a pressure reducing pipe 206 is provided between the temporary storage portion 204 and the upright portion 208 in the second drainage system 2. The pressure reducing pipe 206 is a pipe for reducing the drainage pressure in the second drainage system 2. In the example shown in FIG. 9, the pressure reducing pipe 206 has a bent pipe. The pipeline system is formed in a wave shape having amplitude in the radial direction of the temporary storage portion 204, and has, for example, two turn-back portions 206A and 206B. Thereby, the flow direction of the drain water will be reversed respectively at the turn-back portions 206A and 206B.

The structure of the pressure reducing pipe 206 is not limited to this, and may be the structure shown in FIGS. 12 to 16. In the example of Modification 1 shown in FIGS. 12 to 14, the inlet 222 and the outlet 224 are respectively arranged in the up and down direction, and a swirl part 226 is arranged between the inlet 222 and the outlet 224. The inlet 222 is opened at the end on the center side of the vortex 226, and the outlet 224 is opened at the end on the outside of the vortex 226. The flow direction of the drain water is at the position where it enters the vortex 226 from the inlet 222, and for example, it bends slightly at right angles to the lateral direction from the vertical direction (the curved portion 226A in FIG. 13). After that, it is reversed at the turned-back portion 226B while maintaining the lateral direction, and is bent slightly at right angles at the bending portions 226C and 226D, respectively. Then, at the portion going out from the vortex portion 226 to the outlet 224, it is bent slightly at right angles to the up and down direction from the lateral direction (the bending portion 226E in FIG. 14).

In the modification 2 shown in FIG. 15, the pressure reducing pipe 206 has a pipe whose inner diameter changes to a small diameter, and the inner diameter changes periodically. Specifically, the pressure reducing pipe 206 is formed in a cylindrical shape extending linearly, for example. A large-diameter portion 228 and a small-diameter portion 230 are alternately formed in the axial direction on the inner surface of the pressure reducing pipe 206. The boundary between the large-diameter portion 228 and the small-diameter portion 230 is, for example, a step perpendicular to the axial direction. Both ends of the pressure reducing pipe 206 are, for example, large-diameter portions 228, one of which is the inlet 232, and the other is the outlet 234. In Modification 3 shown in FIG. 16, the pressure reducing pipe 206 has a branch pipe 236. The branch pipeline 236 is branched from the upstream (inlet 238) to the downstream (outlet 240) pipeline, and the end is closed. In this example, the pipeline is bent slightly at right angles toward the inlet 238 and the outlet 240, and a branch pipeline 236 is provided on the extension line of the inlet 238 from the curved portion. The length of the branch pipe 236 is, for example, less than the inner diameter of the pipe. The drainage temporarily enters the branch pipe 236 and hinders the flow of the drainage, thereby causing a pressure loss in the drainage.

In addition, although the illustration is omitted, the pressure reduction pipe may be configured such that the inner diameter of the pipe from the inlet to the outlet gradually increases in diameter. In addition, although the illustration is omitted, the inner diameter of a plurality of pipelines formed in the pipeline may be temporarily expanded and then reduced to return to the normal inner diameter. In other words, the inner wall of the pipeline may also be formed in a serpentine shape with respect to its axial direction. The range of the angle between the inner wall and the axial direction is, for example, 30-40°, and suitably 33-36°.

In addition, the structure of the pressure reduction pipe 206 is not limited to the above-mentioned structures, as long as it can make the drainage flowing through the pressure reduction pipe 206 generate pressure loss. For example, protrusions may be provided on the inner surface of the pipeline to generate turbulence.

(Upright part)

In FIG. 9, the upright portion 208 is provided between the temporary storage portion 204 in the second drainage system 2 and the siphon drain pipe 30 (FIG. 1, FIG. 17, and FIG. 18 ), and is a portion that temporarily drops and then rises. The upright portion 208 only needs to have a structure capable of storing sealed water like a U-shaped or S-shaped pipe trap. For example, the upright portion 208 has a descending portion 208A, a lowermost portion 208B, a rising portion 8C, and an uppermost portion 208D.

The descending portion 208A is connected to the downstream side of the temporary storage portion 204 and the pipeline advances downward. In this embodiment, the pressure reducing pipe 206 is connected to the downstream side of the temporary storage portion 204, and the outlet 206C at the lower end of the pressure reducing pipe 206 is connected to the descending portion 208A. On the downstream side of the temporary storage portion 204, since the pipeline in the pressure reduction pipe 206 also advances downward, it may be considered that a part of the pressure reduction pipe 206 also serves as the descending portion 208A. When the pressure reducing pipe 206 is omitted, the portion extending from the outlet 204B of the temporary storage portion 204 to the lower side constitutes the descending portion 208A (FIGS. 17 and 18 ).

The lowermost part 208B is located at the lowest position in the upright part 208. Although the uppermost part 208D is a horizontal part, for example, as shown in FIGS. 17 and 18, it may not be horizontal. The rising portion 208C is a portion extending linearly from the downstream end portion of the lowermost portion 208B, for example, diagonally upward. The shape of the rising portion 208C is not limited to a linear shape, and may be curved. The uppermost part 208D is a part extending from the upper end of the rising part 208C in the horizontal direction, for example, and is located at the highest position in the upright part 208. The uppermost part 208D does not necessarily have to have a horizontal part, and the horizontal part may be omitted and the uppermost part 208D may be directly connected to the pipe 210. The piping 210 is the piping 210 on the downstream side of the upright portion 208, which extends downward and is connected to the horizontal pipe 30A (siphon drain pipe 30) (FIGS. 1, 17).

The uppermost part 208D of the upright portion 208 may also be set at a position above the height of the exit 204B of the temporary storage portion 204. The line L in FIG. 9 represents the height position of the bottom of the outlet 204B of the temporary storage portion 204. In this example, the height position of the top 208E of the inner surface at the uppermost part 208D is set to a position above the height of the line L. The position above the height of the line L refers to the height position equal to the height of the line L, or a height position higher than the height of the line L.

In addition, if the height position of the uppermost part 208D is raised, the amount of drain water 242 stored in the temporary storage part 204 will increase, and if the height position of the uppermost part 208D is lowered, the amount of drain water stored in the temporary storage part 204 will increase. The amount will become less. In the example shown in FIG. 17, the uppermost portion 208D of the upright portion 208 is set at a position lower than the height of the exit 204B of the temporary storage portion 204. If the height position of the uppermost part 208D is too low, since the drainage 242 in the temporary storage part 204 will flow out, the height position of the uppermost part 208D can be arbitrarily changed within the limit of being able to store the drainage 242 in the temporary storage part 204 .

(Effect)

Next, the function and effect of the drainage pipe structure 10 of this embodiment will be described.

After the waste water is discharged from the kitchen counter 16 due to the use of the kitchen counter 16, the waste water passes through the processor 20, the piping 22 and the pipe trap 24 to reach the piping 26.

After that, the drainage will flow through the horizontal pipe 30A of the siphon drainage pipe 30 and the vertical pipe 30B. When a part of the vertical pipe 30B is filled with drainage, when the drainage in the vertical pipe 30B falls due to gravity, the vertical pipe 30B The siphon force corresponding to the head difference in the vertical pipe 30B will be generated inside.

The drainage in the horizontal pipe 30A will be attracted towards the vertical pipe 30B due to the siphon force, so that the horizontal pipe 30A and the vertical pipe 30B become a full flow filled with drainage, and the flow velocity is increased to flow down the horizontal pipe 30A and the vertical pipe 30B . In this way, the drain from the kitchen counter 16 will be discharged to the drain stand pipe 34.

On the other hand, when the drain water is drained from the dishwasher 18, since the drain presses the air inside the pipe 210 to the downstream side in the drain direction, the air and the pipe inside the horizontal pipe 30A will be compressed and the horizontal pipe 30A will be compressed. The inside becomes a positive pressure, and this positive pressure also acts on the side of the tube well 24 through the pipe 26.

In addition, "positive pressure" refers to outside air whose pressure is higher than that of the environment where the drainage pipe structure 10 is arranged.

Here, when the drain water is discharged from the dishwasher 18 instantaneously, a large positive pressure will temporarily act on the horizontal pipe 30A and the pipe 26, so the sealed water will flow back toward the kitchen counter 16 side. As a result, the tube trap 24 may be unsealed. In addition, if a large amount of drain water is discharged from the dishwasher 18 instantaneously, the drain water discharged from the dishwasher 18 may flow back toward the pipe well 24 and overflow in the pipe well 24. In this embodiment, as described below, it is possible to suppress the unsealing of the sealing water of the pipe well 24 and the overflow of the drain water discharged from the dishwasher 18 in the pipe well 24.

(1) When the drain water is discharged from the dishwasher 18 instantaneously, and the positive pressure in the pipe 26 is increased instantaneously, the pressure in the pipe 26 will become positive, and the air in the pipe 26 will be trapped in the pipe trap 24. However, the positive pressure can be relieved by the pressure relief device 66 installed on the upstream side of the drainage direction of the sealing water, which can suppress the unsealing of the sealing water (here, the unsealing caused by the backflow of air).

(2) Next, compare the tube trap 24 of this embodiment with the tube trap of the conventional structure to illustrate that the drain water flowing backward from the dishwasher 18 is difficult to overflow in the tube trap 24 of this embodiment.

In the conventional tube trap, as shown in FIG. 3B, the side view shape of the portion corresponding to the first curved tube portion 38 of this embodiment is a circular shape with a single radius of curvature. In addition, the upper inner circumferential surface of the pipe corresponding to 38UF of the upper inner circumferential surface of the pipe of this embodiment is a false one shown by the two-point chain line FC1 Think of the arc shape of the round part. In addition, the diameter of the imaginary circle shown by the two-point chain line FC1 is the length of the straight line connecting P1 and P2.

Since the sealing water depth h is a dimension determined by specifications, for example, the position of the liquid level on the downstream side of the sealing water of the traditional pipe trap will be located on the upper side of the pipe that has a circular arc shape from the two-point chain line FC. The lowermost end P'u of the inner peripheral surface is at the height position h above.

That is, the uppermost end P't of the conventional tube well, which is equivalent to the uppermost end Pt of the tube well 24 of this embodiment, is located at a level lower than the uppermost end Pt of the tube well 24 of this embodiment. Location.

Therefore, when the tube trap 24 of this embodiment is installed at the same height as the conventional tube trap, the position of the sealing water surface Ws can be arranged at a higher level than that of the conventional tube trap. The location.

As a result, in the pipe well 24 of this embodiment, the drain water that is discharged from the dishwasher 18 on the downstream side and rises, that is, the reverse flow water, will hardly reach the sealing water stored in the pipe well 24, and is suppressed in the pipe well. The sealing water of 24 overflowed.

(3) In addition, suppose that if the downstream side of the drainage direction of the sealing water of the pipe trap 24 becomes negative pressure, the external air will pass through the vent valve 110 and the pressure relief device 66 and be introduced into the second descending curve of the pipe trap 24 The pipe portion 42B reduces the negative pressure acting on the sealing water, thereby suppressing unsealing caused by the negative pressure.

(4) In the tube well 24 of this embodiment, since the horizontal distance Lb is set to be smaller than the horizontal distance La, compared to the case where the horizontal distance La and the horizontal distance Lb are the same , The drainage will become easier to flow.

(5) In addition, after the drainage is discharged from the kitchen counter 16, the drainage will flow through the processor 20, the piping 22 and the pipe trap 24 in order. When the drainage flows through the second curved pipe portion 42 of the pipe trap 24, the drainage is guided toward the reduced-diameter pipe portion 44 due to the fin 58B protruding from the inside of the second descending curved pipe portion 42B, so it flows from the kitchen It is difficult for the drain discharged from the platform 16 to enter the pressure relief device 66.

(6) When draining water from the dishwasher 18, the drain water flows into the siphon drain pipe 30 through the primary drain trap 202, the temporary storage portion 204, and the upright portion 208. When the inside of the siphon drain pipe 30 becomes full, a siphon force is generated, and the drain is sucked to the downstream side. Since the second drainage system 2 is provided with a temporary storage portion 204, even if the drainage pressure of the dishwasher 18 is large and the flow rate of the drainage becomes large, the temporary storage portion 204 can still receive the drainage and release it. Drain pressure. So, from the 18th row of the dishwasher In the case of water, it is possible to prevent the drainage from flowing backward toward the first water appliance side connected to the upstream side of the dishwasher 18.

In addition, since the entrance 204A of the temporary storage section 204 is based on the transverse direction as the axis direction, and the axis X1 of the entrance 204A is eccentric with respect to the axis Z of the temporary storage section 204 (FIG. 11), the temporary storage section is likely to occur. Replacement of air in 204 and drain 242. Specifically, since the drain 242 flows downward along the inner wall of the temporary storage portion 204, the drain 242 is less likely to receive air resistance when it flows in. As a result, the drainage 242 flows into the temporary storage portion 204 smoothly. Thereby, the discharge of air from the temporary storage part 204 can be suppressed. Also by this, it is possible to reduce the inflow of air to the first hydraulic appliance side, and suppress the pressure increase on the first hydraulic appliance side.

In addition, since the outlet 204B of the temporary storage portion 204 has the transverse direction as the axis direction, and the axis X2 of the outlet 204B is not eccentric with respect to the axis Z of the temporary storage portion 204 (FIG. 11), it flows into the temporary storage portion The drain 242 of 204 will become easy to collect in the outlet 204B. In addition, in the temporary storage portion 204, since the inner surface of the outlet 204B opposite to the outlet 204B is in the axial direction of the outlet 204B, when the drainage 242 is discharged from the temporary storage portion 204, the drainage 242 is directed toward the outlet 204B side. Since the ground is curved, the drainage 242 flowing down along the inner surface on the opposite side to the outlet 204B becomes easy to collect in the outlet 204B. As a result, the outflow of the drain 242 from the outlet 204B becomes smooth.

In FIGS. 17 and 18, when the generation of the siphon force ends, the air in the second drainage system 2 will pass from the primary drain trap 202 and remain in the upstream part of the temporary storage 204, which becomes the part from the temporary storage 204. From the downstream side of the inner portion to the upright portion 208, there will be a state where the drainage 242 remains. Specifically, the upright portion 208 on the downstream side of the temporary storage portion 204 is formed with sealing water having a sealing water height H1. On the other hand, since the second drainage system 2 upstream of the temporary storage portion 204 is closed by the primary drainage trap 202, as the drainage 242 remaining in the temporary storage portion 204 moves to the downstream side (the water level drops), Then, the air remaining in the temporary storage portion 204 from the primary drain trap 202 will expand. As a result, the water level in the temporary storage portion 204 will drop to the head pressure H2 (the force of the drainage to move downstream) of the drainage 242 remaining in the temporary storage portion 204 and the upstream from the primary drainage trap 202 to the temporary storage portion 204 The position on the side where the negative pressure caused by the expansion of air (the force that prevents the drainage from moving to the downstream side) will be balanced. That is, the water level in the temporary storage portion 204 will drop to a position where the drainage cannot pass over the uppermost portion 208D of the upright portion 208 due to the negative pressure caused by the expansion of the air. In other words, the temporary storage part 204 stores the drainage 242 of the water level.

In addition, since the secondary drain well 203 different from the primary drain well 202 is provided, it is easier to form a closed state in the pipe on the upstream side than the temporary storage portion 204. Thereby, the negative pressure for storing the drainage in the temporary storage part 204 can be stably generated in the pipe.

Thereby, since the pipeline from a part of the temporary storage portion 204 to the upright portion 208 is filled with the drainage 242, the pipeline from the upright portion 208 to the siphon drain pipe 30 can be kept in a state of less air. Also by this, when draining water from the dishwasher 18 next time, the inflow of air to the first water appliance side can be reduced, and the pressure increase on the first water appliance side can be suppressed. In addition, since the water surface of the drainage 242 staying in the temporary storage part 204 can be kept constant without repeated wetting and drying, it is difficult for dirt to accumulate in the temporary storage part 204.

In addition, since the temporary storage portion 204 is a part where the volume per unit length of the second drainage system 2 is partially enlarged, the interior of the temporary storage portion 204 does not become dense due to the drainage 242. Therefore, the siphon force almost reaches the upstream side (dishwasher 18 side) of the temporary storage portion 204, and it is not easy to damage the sealing water of the primary drain trap 202 or the sealing water of the secondary drain trap 203.

In addition, since the uppermost portion 208D of the upright portion 208 is set at a position above the height of the exit 204B of the temporary storage portion 204, the temporary storage portion 204 to the upright portion 208 can be easily filled with drainage.

In addition, since the second drainage system 2 is provided with the pressure reducing pipe 206, even if the drain pressure of the dishwasher 18 is high and the flow rate of the drain 242 increases, the pressure reducing pipe 206 can still be used to reduce the drainage pressure, thereby reducing Drain speed. Accordingly, when draining water from the dishwasher 18, it is possible to prevent the drain water 242 from flowing backward toward the first water appliance side connected to the upstream side of the dishwasher 18.

In the pressure reduction piping 206 related to Modification 1 of FIGS. 9, 13, and 14, when the drainage passes through the bent pipe, the drainage can cause pressure loss. In the pressure reduction piping 206 related to Modification 2 of FIG. 15, when the drain 242 passes through a pipe whose inner diameter changes to a small diameter, the drain can cause a pressure loss. As a result, the drainage pressure can be reduced. In the pressure reduction pipe 206 related to Modification 3 of FIG. 16, a part of the drain water can enter the branch pipe 236 to cause a pressure loss in the drain water. As a result, the drainage pressure can be reduced. In this way, the drainage pressure can be reduced by the various pressure reducing pipes 206.

In this way, according to the present embodiment, in a drainage pipe structure in which a siphon drainage pipe 30 is connected with multiple water appliances, when the water is drained from the water appliance connected to the downstream side, the upward direction can be suppressed The backflow of the water equipment on the upstream side and the pressure increase on the water equipment side.

[The second modification of the rectification unit and the second modification of the pressure relief device]

Next, the second modification example of the pressure relief device 66 and the second modification example of the rectifying assembly 58 described in the above-mentioned embodiment will be explained in accordance with FIGS. 19 to 21.

(The second modification of the rectifier unit)

Regarding the rectifier assembly 300 related to the second modification shown in FIGS. 19 to 21, the entire rectifier assembly 300 is formed of an elastic body such as rubber or synthetic resin, and is elastically deformable. The rectifying assembly 300 includes a cylindrical portion 300A inserted into the pressure relief device mounting portion 56.

A flange 300C is formed on the upper end of the cylindrical portion 300A. The flange 300C is pinched between the lower end of the insertion tube portion 82 of the pressure relief device 66 and the step formed by the inner peripheral surface of the pressure relief device attachment portion 56 to fix the rectifier assembly 300 to the pressure relief device attachment portion 56.

As shown in FIGS. 19 and 20, the lower end of the cylindrical portion 300A is formed with an opening 302 inclined with respect to the axis of the cylindrical portion 300A. The opening 302 is inclined so that the upstream side in the drainage direction becomes upper side than the downstream side in the drainage direction. Therefore, the opening 302 has a substantially elliptical shape (not shown) in a plan view.

The upper end side of the opening 302 is an end integrally connected with the fin 300B, and the fin 300B has a function of opening and closing the valve body of the opening 302. The connecting portion 304 between one end of the fin 300B and the opening 302 has the function of a hinge, and the fin 300B can swing with the connecting portion 304 as a fulcrum (the direction of arrow A in FIG. 19 and the direction opposite to the direction of arrow A). The opening 302 is opened and closed. In addition, since the fin portion 300B closes the opening portion 302, it has a substantially oval shape similar to that of the opening portion 302.

As shown in FIG. 19, the fin 300B in the normal state (a free state where the drainage does not flow) protrudes from the inside of the second descending curved pipe portion 42B. In more detail, when the opening portion of the pressure relief device mounting portion 56 provided in the second descending curved pipe portion 42B is set with an imaginary line FL connected to the inner peripheral surface of the second descending curved pipe portion 42B, the fin portion 300B Then, it protrudes toward the inside of the second descending curved pipe portion 42B from the virtual line FL.

In addition, in this embodiment, although the fin 300B is made to protrude further toward the inner side of the second descending curved tube portion 42B than the imaginary line FL, the fin 300B may be protruded as needed, or the fin 300B may not be allowed to protrude. protrude.

In the normal state, a slot S as a gap is provided between the opening 302 and the fin 300B, and in the normal state, the fin 300B is separated from the opening 302. Therefore, in the rectifying assembly 300 at the normal time, air can be passed through the cylindrical portion 300A in the vertical direction.

The fin part 300B is inclined with respect to the vertical direction so as to guide the drainage direction from the upstream kitchen countertop 16 toward the reduced-diameter pipe part 44 side. In other words, the fin 300B has a function of directing the flow of the drainage toward the lower side of the downstream side in the drainage direction, so that the drainage flowing from the upstream side can hardly flow into the pressure relief device 66 side. In addition, since the fin portion 300B is bent in the same manner as the second descending curved pipe portion 42B to allow the drainage to flow along the curved fin portion 300B, the flow of drainage is not obstructed under normal conditions.

In addition, when a large amount of temporary drainage is discharged from the kitchen countertop 16 to the fin 300B protruding from the inside of the second descending curved pipe part 42B (for example, when a large amount of water accumulated in the kitchen countertop 16 is discharged at one time The so-called reservoir.), the fin 300B will be pressed by a large amount of drainage and sway in the direction of arrow A, and the opening 302 can be closed. Thereby, the drainage discharged from the kitchen countertop 16 can be prevented from flowing back to the pressure relief device 66 side, and the drainage discharged from the kitchen countertop 16 can be efficiently caused to flow downstream.

When the fin 300B is pressed by a large amount of drainage and swayed in the direction of arrow A, and contacts the opening 302 to close the opening 302, in other words, when the opening 302 is closed, as shown by the two-dot chain line in FIG. 19 Typically, the fin 300B does not enter the inner side of the cylindrical portion 300A through the opening 302, but protrudes toward the outer side of the opening 302 (the inner side of the second descending curved pipe portion 42B). The size of the fin 300B (for example, the length of the ellipse in the major axis direction) is set to be larger than that of the opening 302.

Assuming that the size of the fin 300B is smaller than the opening 302, and the fin 300B compressed by the drainage will enter the inner side of the cylinder 300A through the opening 302, the fin 300B will be stuck in the cylinder 300A. When the drainage becomes stagnant, there is a concern that the fin 300B will not return to its original position.

In addition, in the present embodiment, when the opening 302 is closed by the fin 300B, although a part of the fin 300B protrudes to the outside of the opening 302, the fin 300B is compressed due to drainage. 300B does not enter the inner side of the cylindrical portion 300A. When the drainage becomes unable to flow, it is sufficient to return the fin portion 300B to the original position.

For example, when the fin 300B is compressed due to drainage and closes the opening 302, the surface of the fin 300B may be aligned with the imaginary line FL connected to the inner peripheral surface of the second descending curved pipe portion 42B.

When a large amount of drainage flows to close the opening 302, if the surface of the fin 300B is aligned with the imaginary line FL connected to the inner peripheral surface of the second descending curved pipe portion 42B, the inside of the second descending curved pipe portion 42B is not There will be a step difference that will become a resistance to the flow of drainage, so that a large amount of drainage can flow more efficiently.

As shown in FIGS. 19 and 21, the outer surface of the fin 300B, in other words, the inner outer surface facing the second descending curved pipe portion 42B is formed with a plurality of ribs 306. The rib 306 extends along the longitudinal direction (in other words, the flow of drainage) of the second descending curved pipe portion 42B.

If the outer surface of the fin 300B is a flat surface, dirt in the drainage (for example, dirt that is as thin as an onion skin and easily adhered) will be easily adhered, but if the outer surface of the fin 300B is formed with a plurality of ribs 306. Since the contact area between the fin 300B and the dirt is reduced, the dirt only contacts the ribs 306, which can prevent dirt from adhering (in other words, close to) the fin 300B. In addition, as long as it is a conformation that can suppress dirt in the drainage, the ribs 306 may be replaced, and other shapes such as hemispherical protrusions may be provided on the outer surface of the fin 300B.

(The second modification of the pressure relief device)

Next, the pressure relief device 400 related to the second modification example will be explained based on FIGS. 22 to 29.

As shown in FIGS. 22-24, the pressure relief device 400 related to the second modification includes a thin elastic expansion and contraction body 468 formed of an elastic material such as rubber, and supports the lower end side of the elastic expansion and contraction body 468. The supporting component 470, the upper supporting component 472 on the upper end side of the elastic expansion and contraction body 468, the cover body 474, and the like are supported.

As shown in FIGS. 25 and 26, the elastic expansion and contraction body 468 is a cylindrical body with an outlet and an inlet. The elastic expansion and contraction body 468 includes a cross-shaped cylindrical expansion and contraction portion 468A when viewed from the axial direction, and the expansion and contraction portion 468A includes four expansion and contraction pieces 488 extending from the axis in the radial direction (radial outer side). Therefore, the inside of the expansion and contraction portion 468A is provided with a space S having a cross-section and extending in the axial direction.

Both ends of the expansion and contraction portion 468A in the axial direction are integrally formed with a base portion 468B having a circular outer shape. The outer peripheral portion of the base 468B is integrally formed to install the elastic expansion and contraction body 468 on the lower support assembly 470 and the ring-shaped mounting portion 468C of the upper support assembly 472. In addition, a thick rib 468D is formed at the end of the attachment portion 468C.

As shown in FIG. 26(B), the expansion and contraction piece 488 is provided with a pair of wall portions 488A arranged in parallel and spaced apart from each other. .

In addition, the adjacent expansion/contraction piece 488 and the other expansion/contraction piece 488 are connected to each other with adjacent wall surfaces 488A through an arc wall portion 488C having an arc shape in cross section.

Here, as shown in FIG. 26(B), when the axial middle portion of the elastic expansion and contraction body 468 is cut in a direction intersecting the axis and viewed from the axial direction, one of the expansion and contraction pieces 488 is opposed to the wall portion When the interval of 488A is taken as A, and the diameter of the imaginary inscribed circle FC inscribed in the four arc wall portions 488C at the center of the elastic expansion and contraction body 468 is B, the interval A<diameter B will be.

As shown in FIG. 25, the corner portion 490 formed by the wall portion 488A of one of the expansion and contraction piece 488 and the wall portion 488A of the other expansion and contraction piece 488 and the base portion 468B is formed to slide from the base portion 468B toward the wall portion 488A. The upright portion 492 that stands up straight and has a circular arc shape in cross section (or an inclined surface inclined with respect to the base portion 468B). As shown in FIG. 26(A), the shape of the rising portion 492 viewed from the axial direction is a substantially triangular shape.

In the portion where the rising portion 492 is formed, the diameter B (see FIG. 26(B)) of the aforementioned virtual inscribed circle FC gradually increases toward the outside in the axial direction.

If the pressure of the internal space S of the expansion and contraction portion 468A is higher than the external pressure (atmospheric pressure), the portion recessed toward the radially inner side will expand to the radially outer side (for example, in the direction of the arrow shown in FIG. 26(B)) .

Assuming that the expansion and contraction portion 468A is cylindrical, in order to expand the expansion and contraction portion 468A to the outside in the radial direction, the elastic component itself constituting the expansion and contraction portion 468A must be stretched. In other words, when expanding the expansion and contraction portion 468A, the internal pressure of the expansion and contraction portion 468A must be increased considerably.

On the other hand, the expansion and contraction portion 468A of this embodiment is shown in FIG. 26(B). Since the cross-sectional shape is formed into a cross shape, during the expansion process, the portion that is recessed toward the radially inner side will face due to internal pressure. When the radially outer side is compressed, the shape of the expansion and contraction portion 468A may be deformed, but compared to the case where the expansion and contraction portion 468A is cylindrical, the tension is only applied to the elastic body itself.

Therefore, the expansion and contraction portion 468A can easily expand its volume when air flows in, and the increase in internal pressure can be suppressed more than when the expansion and contraction portion 468A has a cylindrical shape.

In addition, if the raised portion 492 is formed in the corner portion 490 of the elastic expansion and contraction body 468 as in the present embodiment, compared with the case where the raised portion 492 is not formed in the corner portion 490, in other words, the corner portion 490 When one wall portion 488A and the other wall portion 488A and the base portion 468B are connected at right angles to each other, the expansion and contraction portion 468A becomes easier to expand to the outside, and it becomes easier to suppress the increase in internal pressure.

On the other hand, if the downstream side of the drain direction of the pipe trap 24 becomes negative pressure, and the pressure of the space S inside the expansion and contraction portion 468A is lower than the external pressure (atmospheric pressure), as shown in FIG. 26(C), it will In some cases, the opposite wall portion 488A and the other wall portion 488A of the expansion and contraction piece 488 are closely adhered to each other. However, the axial part of the expansion and contraction portion 468A is surrounded by four circular arc wall portions 488C and linearly penetrates the through space S1 between the outlet and the entrance of the elastic expansion and contraction body 468 (it is a part of the space S and will become a passage for air). Set the shape, size (radius of curvature), etc. of the arc wall portion 488C by leaving the gap).

That is, when the internal space S becomes a negative pressure, the expansion/contraction part 468A suppresses the inner peripheral surfaces from adhering to each other and makes the space S completely disappear. Therefore, in the elastic expansion and contraction body 468 of the present embodiment, even when the internal space S becomes a negative pressure, the penetrating space S1 can be ensured to penetrate in the axial direction, so that ventilation can be performed in the axial direction.

As shown in FIGS. 23, 24 and 27, the mounting portion 468C on the lower side of the elastic expansion and contraction body 468 is inserted with the lower support assembly 470. The mounting portion 468C is sandwiched between the lower support assembly 470 and the mounting ring 496 arranged outside the mounting portion 468C, and is fixed to the lower support assembly 470. In addition, the rib 468D of the mounting portion 468C is inserted into the annular groove 478 formed on the outer periphery of the lower support assembly 470 and is compressed.

In addition, the mounting portion 468C on the upper side of the elastic expansion and contraction body 468 is inserted with the upper support assembly 472, and the mounting portion 468C is held between the upper support assembly 472 and the mounting ring 496 arranged outside the mounting portion 468C, and is fixed to Upper support assembly 472. In addition, the rib 468D of the mounting portion 468C is inserted into the annular groove 478 formed on the outer periphery of the upper support assembly 472 and is compressed.

As shown in FIGS. 22 and 28, the cylindrical cover 474 is composed of a first half-division unit 474A on one side and a second half-division unit 474B on the other side with an axis interposed therebetween. The cover 474 of this embodiment is a molded product of synthetic resin (for example, an injection molded product).

The first half unit 474A is provided with a circular arc wall portion 474Aa that halves the cylinder, and an arc-shaped flange 474Ab is formed at the upper end, and an arc-shaped flange 474Ac is formed at the lower end.

The second half unit 474B is provided with a circular arc wall portion 474Ba that halves the cylinder, an arc-shaped flange 474Bb is formed at the upper end, and an arc-shaped flange 474Bc is formed at the lower end (see FIG. 23).

A plurality of claw assemblies 474Ae are formed at the inner end of the arc wall portion 474Aa of the first half unit 474A. The claw assembly 474Ae protrudes toward the inner surface side of the arc wall portion 474Ba of the second half-equivalent assembly 474B, and is engaged with the engagement hole 474Bd formed by the arc wall portion 474Ba of the second half-equivalent assembly 474B.

In addition, a plurality of claw assemblies 474Be are formed at the inner end of the arc wall portion 474Ba of the second half-divided assembly 474B. The claw assembly 474Be protrudes toward the inner surface side of the arc wall portion 474Aa of the first half halving assembly 474A, and is engaged with the engaging hole 474Ad formed by the arc wall portion 474Aa of the first half halving assembly 474A.

Make the first half-divided component 474A and the second half-divided component 474B face to face to engage the pawl component 474Be in the engaging hole 474Ad, and hook the pawl component 474Ae to the engaging hole 474Bd, thereby halving the first half The assembly 474A and the second half-division assembly 474B are fixed to each other to form a cylindrical cover 474.

As shown in FIG. 28, the first half-division unit 474A is adjacent to the flange on both axial sides of the inner circumference to form grooves 474Af, and the second half-division unit 474B is adjacent to both sides in the axial direction of the inner circumference. A groove 474Bf is formed in the flange. As shown in FIG. 23, the groove 474Af of the first half-division unit 474A and the groove 474Bf of the second half-division unit 474B are inserted into the mounting ring 496 to which the elastic expansion and contraction body 468 is fixed.

As a result, the mounting ring 496 that fixes the upper side of the elastic expansion and contraction body 468 is caught by the step formed by the widthwise end of the groove 474Af on the upper side of the cover 474 and the widthwise end of the groove 474Bf. Stepped part. In addition, the mounting ring 496 on the lower side of the elastic expansion and contraction body 468 is caught by the step formed by the widthwise end of the groove 474Af on the lower side of the cover 474 and the widthwise end of the groove 474Bf. Stepped part. Thereby, the elastic expansion and contraction body 468 installed with the lower support assembly 470 and the upper support assembly 472 is fixed inside the cover 474.

Since the upper support member 472 and the lower support member 470 of the fixed elastic expansion and contraction body 468 are fixed inside the cover 474 as described above, even when the elastic expansion and contraction body 468 is deformed due to changes in internal pressure, The axial movement of the elastic expansion and contraction body 468 can still be suppressed.

The elastic expansion and contraction body 468 is covered by the cover body 474 from the expansion and contraction direction of the elastic expansion and contraction body 468 (the direction that crosses the axial direction of the elastic expansion and contraction body 468) and the axial direction that crosses the expansion and contraction direction. Down The side support assembly 470 and the upper support assembly 472 are protected in such a way that they do not come into contact with components other than the cover 474.

In addition, when the elastic expansion and contraction body 468 expands or contracts inside the cover 474, the first and second half halves 474A and 474B are formed with slots 474g on the lower side in the axial direction, so that Air can enter and exit between the space S2 between the cover 474 and the elastic expansion and contraction body 468 and the outside air outside the cover 474. Thereby, the elastic expansion and contraction body 468 can easily expand or contract.

A tapered through hole 480 is formed in the center of the lower support assembly 470, and an insertion tube 482 communicating with the through hole 480 protrudes from the center of the lower surface. The insertion tube portion 482 is inserted into the pressure relief device attachment portion 56 of the tube trap 24 to attach the pressure relief device 400 to the tube trap 24.

As shown in FIGS. 23 and 27, the center of the upper support assembly 472 has a cylindrical check valve attachment portion 486 protruding upward. A male thread 486A is formed on the outer periphery of the check valve mounting part 486, and the vent valve 110 is mounted on the check valve mounting part 486 by the male thread 486A.

As shown in FIG. 27, the inner peripheral surface of the check valve attachment portion 486 is formed with a plurality of ribs 502 protruding to the inside in the radial direction and extending in the axial direction. As a result, as shown in FIG. 29(A), a gap S3 through which air can circulate is formed in the axial direction between the valve body 412 described later and the inner peripheral surface of the check valve attachment portion 86.

As shown in FIGS. 27 and 29, a valve body supporting portion 504 is formed at the lower end of the check valve mounting portion 86 so that the valve body 412, which will be described later, does not fall to the lower pressure relief device 466. In addition, the valve body supporting portion 504 is formed with a plurality of holes 506 through which air can pass.

As shown in FIG. 23 and FIG. 29(A), inside the check valve attachment portion 486, a valve body 412 is arranged on the valve body support portion 504. The specific gravity of the valve body 412 is set to float on the drain.

The valve body 412 is formed in a substantially truncated cone shape as a whole. The valve body 412 is connected to the radially outer portion of the upper side, and is formed with an annular recess 412A having a circular arc shape in cross section.

An annular valve seat 508 formed of an elastic body such as rubber is attached to the upper portion of the check valve attachment portion 486.

As shown in FIG. 29(A), in normal times, the valve body 412 arranged on the valve body support portion 504 is separated from the valve seat 508 to allow air to circulate through the gap S4 between the valve body 412 and the valve seat 508 In the up and down direction.

On the other hand, when the drain from the lower pressure relief device 466 flows back and rises to the valve body 412, as shown in FIG. 29(B), the valve seat 412 floats on the drain (not shown in the figure) and contacts the valve seat 508 , To close the valve hole 508A formed in the center of the valve seat 508.

Therefore, even if the drain water enters the pressure relief device 466, it is possible to prevent the drain water that flows back from the pressure relief device 466 and rises from flowing into the vent valve 110 arranged above.

As shown in FIG. 27, the outer periphery of the upper support assembly 472 is formed with a plurality of protrusions 472A (only one is shown in FIG. 27) protruding radially outward. As shown in FIG. 22, the protrusion 472A is inserted into the first The fitting hole 510 formed by the half-division component 474A and the second half-division component 474B. In this way, the upper support assembly 472 and the cover 474 cannot rotate relatively.

In addition, the outer peripheral portion of the lower support assembly 474 is not formed with the above-mentioned general protrusion 472A. Therefore, the lower support assembly 474 is capable of relative rotation with respect to the cover 474 in a state where the mounting ring 496 will be inserted into the groove 474Af and the groove 474Bf of the cover 474 to prevent axial movement.

(Sequence of assembling steps of pressure relief device 400)

As an example, the pressure relief device 400 is assembled as follows.

(1) Use the mounting ring 496 to install the upper support assembly 472 on one axial side of the elastic expansion and contraction body 468, and use the installation ring 496 to install the lower support assembly 474 on the other axial direction of the elastic expansion and contraction body 468. side.

(2) Arrange the above-mentioned elastic expansion and contraction body 468 to which the upper support assembly 472 and the lower support assembly 474 are installed between the first half-half assembly 474A and the second half-half assembly 474B facing each other, and the upper side The protrusion 472A of the supporting component 472 is inserted into the fitting hole 510 to combine the first half-division component 474A and the second half-division component 474B.

(3) Insert the valve body 412 into the check valve installation part 486, and install the valve seat 508 on the upper part of the check valve installation part 486.

(4) Finally, the vent valve 110 is locked in the check valve mounting part 486 of the upper support assembly 472 to fix the vent valve 110 to the check valve mounting part 486. At this time, it is possible to hold and fix the cover 474 of the pressure relief device 400 with one hand, and hold the vent valve 110 with the other hand and lock the vent valve 110 into the check valve installation part 486. Since the upper support assembly 472 and the cover body 474 are installed so as not to rotate relative to each other, as long as the cover body 474 is held and fixed by hand, the upper support assembly 472 will be locked when the vent valve 110 is locked into the check valve mounting portion 486. Will not rotate.

(5) Insert the insertion tube portion 482 of the pressure relief device 466 to which the vent valve 110 is attached to the pressure relief device attachment portion 56 of the tube trap 24 to attach the pressure relief device 400 to the tube trap 24.

In addition, in the pressure relief device 400 of this embodiment, the lower support assembly 474 is relatively rotatable with respect to the cover 474. However, if it is assumed that the same protrusion 472A as the upper support member 472 is formed on the outer periphery of the lower support member 474, and the protrusion 472A is inserted into the fitting hole 510 of the cover body 474, the lower support member 474 and the cover body 474 cannot be For relative rotation, attention must be paid to the assembly of the pressure relief device 400 as described below.

Since the first half-equivalent unit 474A and the second half-equivalent unit 474B are molded products, the positions of the upper fitting hole 510 and the lower fitting hole 510 are determined. That is, the circumferential positional relationship between the upper fitting hole 510 and the lower fitting hole 510 has been determined.

Therefore, when the lower support assembly 470 and the upper support assembly 472 are mounted on the elastic expansion and contraction body 468, it is necessary to fit the two fitting holes 510 formed by the first half-half assembly 474A and the second half-half assembly 474B. To determine the circumferential positional relationship (circumferential angle) between the protrusion 472A of the lower support assembly 470 and the protrusion 472A of the upper support assembly 472.

Here, the circumferential positional relationship between the protrusion 472A of the lower support assembly 470 and the protrusion 472A of the upper support assembly 472 when mounted on the elastic expansion and contraction body 468 is not consistent with the first half-division assembly 474A and the second half, etc. In the case of the circumferential positional relationship between the upper fitting hole 510 and the lower fitting hole 510 formed by the subassembly 474B, the lower support assembly 470 and the upper support assembly 472 must be twisted in the circumferential direction to make the positional relationship consistent. Then, each protrusion 472A is inserted into each fitting hole 510.

Although the cover 474 can be installed by this, if the elastic expansion and contraction body 468 is fixed to the inside of the cover body 474 in a twisted state, useless deformation (skew) will remain in the elastic expansion and contraction body 468, and there will be The elastic expansion and contraction body 468 may become difficult to expand or contract.

On the other hand, in the pressure relief device 400 of this embodiment, since the lower support member 474 is not formed with the protrusion 472A inserted into the fitting hole 510, it is only necessary to align the protrusion 472A of the upper support member 472 with the first half. The upper side of the fitting hole 510 formed by the halving component 474A and the second halving component 474B is used to combine the first halving component 474A and the second halving component 474B, and the elastic body can be expanded and contracted without twisting. 468 is fixed inside the cover 474. Thereby, the installation of the cover body 474 becomes easy, and the expansion and contraction performance of the elastic expansion and contraction body 468 can be ensured.

[Other implementation types]

Above, although one embodiment of the present invention has been described, the present invention is not limited to the above-mentioned embodiment. Of course, various modifications can be made in addition to the above-mentioned embodiment without departing from the gist of the present invention. Implement it.

In the above embodiment, the kitchen counter 16 is equivalent to the first water appliance of the present invention, and the dishwasher 18 is equivalent to the second water appliance of the present invention. However, the first and second water appliances are capable of The type of drainage is not particularly limited. As the water equipment, for example, a washbasin, a washing machine, a bathtub, a bathroom, etc. may be mentioned, but they may be others.

In the drainage pipe structure 10 of the above-mentioned embodiment, although the kitchen flow counter 16 is provided with a processor 20, the processor 20 may not be provided.

In the above embodiment, although the vent valve 110 is used as an example of the vent, the present invention is not limited to this. As long as the pipe on the downstream side of the pipe trap 24 becomes negative pressure, the outside air can be introduced. To suppress the negative pressure, other configurations may be adopted instead of the vent valve. For example, instead of the vent valve 110, one end of the pipe may be connected to the pressure relief device 66, and the other end of the pipe may be connected to the drain standpipe 34 or the like. In this case, the air inside the drain stand pipe 34 can be introduced into the pipe on the downstream side of the pipe trap 24 to suppress the negative pressure in the pipe.

The pressure relief device 66 and the vent valve 110 may be provided as needed, and may not be provided as long as they can inhibit deblocking.

Although the temporary storage portion 204 is formed in a cylindrical shape with the vertical direction as the axial direction, the shape is not limited to this, and may be any shape such as a rectangular parallelepiped. In addition, although the axis X1 of the inlet 204A is eccentric with respect to the axis Z of the temporary storage portion 204, it may be a non-eccentric configuration. Although the axis X2 of the outlet 204B is not eccentric with respect to the axis Z of the temporary storage portion 204, it may have an eccentric configuration.

Although the upright portion 208 is provided between the temporary storage portion 204 and the siphon drain pipe 30 in the second drainage system 2, the upright portion 208 may not be provided. In addition, although the pressure reduction pipe 206 is provided between the temporary storage portion 204 and the upright portion 208 in the second drainage system 2, the pressure reduction pipe 206 may not be provided.

1: The first drainage system

2: 2nd drainage system

10: Drainage pipe structure

12: Floor

14: Floor

16: kitchen counter

16A: Drain

18: dishwasher

20: processor

22: Piping

24: Water-sealed tube trap

26: Piping

28: Confluence connector

30: siphon drain

30A: Transverse tube

30B: Standpipe

32: Longitudinal hole

34: Drain standpipe

65: Pressure adjustment device

66: Pressure Relief Device

90: check valve

110: Vent valve

202: Primary drainage trap

203: Secondary drain trap

204: Temporary Storage

206: Pressure reduction piping

208: Upright

210, 212: Piping

Claims (9)

A drainage pipe structure with: The first drainage system is for the drainage of drainage from the first water machine; The second drainage system is for the drainage of water from the second water machine; The siphon drainage pipe is connected to the first drainage system on the upstream side, and is connected to the second drainage system on the downstream side than the first drainage system; and The pressure reduction piping is installed in the second drainage system and reduces the drainage pressure in the second drainage system. For example, the drainage pipe structure of the first item in the scope of patent application, in which the pressure reducing piping system has a bent pipe. For example, the drainage pipe structure of the first item in the scope of patent application, in which the pressure reducing piping system has a pipe whose inner diameter changes to a small diameter. For example, the drainage pipe structure of the first item in the scope of patent application, in which the pressure reduction piping system has branch pipes that branch from upstream to downstream, and whose ends are closed. For example, the drainage pipe structure of any one of items 1 to 4 in the scope of the patent application has a temporary storage part, the temporary storage part is set in the second drainage system, and the inlet is set at a higher position than the outlet , And the volume per unit length in the second drainage system will be partially enlarged, and the vertical direction is the cylindrical shape of the axis; The inlet is formed into a cylindrical shape with the transverse direction as the axis direction; The axis of the inlet is eccentric with respect to the axis of the temporary storage part; The outlet is formed into a cylindrical shape with the transverse direction as the axis direction; The axis of the outlet is not eccentric with respect to the axis of the temporary storage part. For example, the drainage pipe structure of the first item of the scope of patent application, in which the pressure reducing pipe in the second drainage system and the siphon drainage pipe are provided with an upright part where the pipeline will first drop and then rise. For example, the drainage pipe structure of item 1 in the scope of patent application is provided with a first drainage trap in the first drainage system; The first drainage trap has: The inflow part is for the inflow of drainage to circulate downwards; The first descending curved pipe part is arranged below the inflow part, and is bent downward from the upper side in the vertical direction toward the horizontal direction; The first ascending curved pipe part is provided on the drain downstream side of the first descending curved pipe part, and is curved upward from the horizontal direction to the upper side in the vertical direction; The second ascending and bending pipe portion is arranged on the downstream side of the first ascending and bending pipe portion in the drainage direction, and is bent upward from the lower side in the vertical direction toward the horizontal direction; The second descending curved pipe portion is provided on the downstream side of the second ascending curved pipe portion in the drainage direction, and is curved downward from the horizontal direction to the lower side in the vertical direction; and The pressure relief device is arranged on the upper side of the second descending curved pipe portion, and communicates with the second descending curved pipe portion to relax the pressure in the pipe. For example, the drainage pipe structure of the seventh item in the scope of patent application is provided with a vent that can introduce air from the outside to the downstream side of the sealing water portion of the first drainage trap above the pressure relief device. For example, the drainage pipe structure of item 7 or 8 in the scope of patent application, wherein the line at the upstream end of the drainage direction of the axis of the first ascending curved pipe portion has an angle with respect to the axis of the inflow portion.

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