CN112695879A

CN112695879A - Drain pipe structure

Info

Publication number: CN112695879A
Application number: CN202011146177.4A
Authority: CN
Inventors: 前川健人
Original assignee: Bridgestone Corp
Current assignee: Bridgestone Corp
Priority date: 2019-10-23
Filing date: 2020-10-23
Publication date: 2021-04-23
Also published as: JP2021067091A; JP7436178B2; TW202134506A

Abstract

The invention provides a novel drain pipe structure which suppresses abnormal noise. The drain pipe structure (C) includes: a storage tank (10) connected to the inflow pipe (120) and the outflow pipe (130); and a communication section (110) that is connected to the outflow pipe (130) and the storage tank (10) so that the outflow pipe (130) and the storage tank (10) communicate with each other.

Description

Drain pipe structure

Technical Field

The present invention relates to a drain pipe structure.

Background

As a conventional drain pipe structure, for example, there is a siphon drain pipe structure in which a siphon drain pipe connected to a storage tank is provided with a vent pipe for allowing external air to flow therein (see, for example, patent document 1). According to such a drain pipe structure, it is possible to suppress the occurrence of abnormal noise when the siphon drain pipe sucks air together with drain water at the connection portion thereof connected to the reservoir tank.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2017-190626

Disclosure of Invention

Problems to be solved by the invention

However, the conventional drain pipe structure has room for improvement in suppressing abnormal noise.

The invention aims to provide a novel drain pipe structure which restrains abnormal sound.

Means for solving the problems

The drain pipe structure of the present invention includes: a storage tank connected to the inflow pipe and the outflow pipe; and a communicating portion that is connected to the outflow tube and the storage tank so as to communicate the outflow tube with the storage tank. The drain pipe structure of the present invention is a novel drain pipe structure in which abnormal noise is suppressed.

In the drain pipe structure according to the present invention, it is preferable that the communication portion includes a muffler having a tubular passage including an inlet portion leading to the outflow pipe and an outlet portion leading to the reservoir tank. In this case, abnormal noise can be further suppressed.

In the drain pipe structure of the present invention, it is preferable that the muffler includes a vent pipe that leads to the outlet portion and the storage tank. In this case, abnormal noise can be suppressed more effectively.

In the drain pipe structure according to the present invention, it is preferable that the tubular passage includes a trifurcate branch passage on the inlet portion side, an inflow passage of the trifurcate branch passage leads to the inlet portion, a tip of an outflow passage on one side of the trifurcate branch passage is closed, and an outflow passage on the other side of the trifurcate branch passage leads to the outlet portion.

In this case, abnormal noise can be suppressed more effectively.

In the drain pipe structure according to the present invention, it is preferable that the tubular passage includes a small cross-sectional area portion having a cross-sectional area smaller than a cross-sectional area of the inlet portion.

In this case, abnormal noise can be suppressed more effectively.

In the drain pipe structure of the present invention, it is preferable that the tubular passage includes a folded-back passage. In this case, abnormal noise can be suppressed more effectively.

In the drain pipe structure of the present invention, it is preferable that the tubular passage includes a trifurcate branch passage on the inlet portion side, an inflow passage of the trifurcate branch passage leads to the inlet portion, a tip of one outflow passage of the trifurcate branch passage is closed, the other outflow passage of the trifurcate branch passage leads to the outlet portion, and the other outflow passage includes a small cross-sectional area portion having a cross-sectional area smaller than a cross-sectional area of the inlet portion. In this case, abnormal noise can be suppressed more effectively.

In the drain pipe structure according to the present invention, it is preferable that the tubular passage includes a trifurcate branch passage on the inlet portion side, an inflow passage of the trifurcate branch passage leads to the inlet portion, a tip of one outflow passage of the trifurcate branch passage is closed, the other outflow passage of the trifurcate branch passage leads to the outlet portion, and the other outflow passage includes a return passage. In this case, abnormal noise can be suppressed more effectively.

In the drain pipe structure according to the present invention, it is preferable that the tubular passage includes a three-branched passage on one side of the inlet portion, an inflow passage of the three-branched passage leading to the inlet portion, a tip of an outflow passage on the side of the three-branched passage being closed, and the other outflow passage of the three-branched passage leading to the outlet portion, the other outflow passage including a small cross-sectional area portion having a cross-sectional area smaller than that of the inlet portion, and a folded-back passage. In this case, abnormal noise can be suppressed most effectively.

In the drain pipe structure according to the present invention, it is preferable that the bottom of the outlet portion is disposed above the bottom of the inlet portion. In this case, inflow and stagnation of the liquid can be suppressed.

In the drain pipe structure according to the present invention, it is preferable that the communicating portion includes an outlet pipe side duct portion connected to the outlet pipe and the muffler, and a reservoir tank side duct portion connected to the muffler and the reservoir tank, the outlet pipe side duct portion is a bent pipe rising upward from the outlet pipe, and the reservoir tank side duct portion is a straight pipe extending in parallel with the outlet pipe. In this case, inflow and stagnation of the liquid can be suppressed.

In the drain pipe structure of the present invention, it is preferable that the branch portion of the trifurcated branch passage has a T-letter shape. In this case, the abnormal sound input from the inflow passage and the abnormal sound rebounded from the one-side outflow passage of the trifurcated branch passage can be effectively cancelled. Therefore, in this case, abnormal noise can be suppressed more effectively.

In the drain pipe structure of the present invention, it is preferable that the outflow pipe is a siphon drain pipe. In this case, it is effective to suppress abnormal noise.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, a novel drain pipe structure in which abnormal noise is suppressed can be provided.

Drawings

Fig. 1 is a plan view showing a drain pipe structure C according to an embodiment of the present invention.

Fig. 2 is a front view showing a drain pipe structure of fig. 1.

Fig. 3 is a sectional view a-a of fig. 2.

Fig. 4 is a perspective view showing the outflow pipe side duct portion, the reservoir side duct portion, and the exhaust side vent pipe portion from above.

Fig. 5 is a perspective view showing the periphery of the communication portion of the drain pipe structure of fig. 1 from above.

Fig. 6 is a plan view showing a muffler unit of the drain pipe structure of fig. 1.

Fig. 7 is a bottom view showing the muffler unit of fig. 6.

Fig. 8 is a right side view of the muffler unit of fig. 6.

Fig. 9 is a left side view of the muffler unit of fig. 6.

Fig. 10 is a rear view of the muffler unit of fig. 6.

Fig. 11 is a front view of the muffler unit of fig. 6.

Fig. 12 is a view corresponding to a section a-a of the muffler unit of fig. 6.

Fig. 13 is a sectional view B-B of fig. 6.

Fig. 14 is a cross-sectional view C-C of fig. 6.

Fig. 15 is a cross-sectional view taken along line D-D of fig. 6.

Fig. 16 is a cross-sectional view E-E of fig. 6.

Fig. 17 is a perspective bottom view showing the muffler unit of fig. 6 from the lower side.

Fig. 18 is a perspective view showing a lower member of the muffler unit of fig. 6 from the upper side.

Fig. 19 is a perspective view showing an upper member of the muffler unit of fig. 6 from below.

Fig. 20 is an enlarged cross-sectional view of fig. 3 for explaining an opening closing step of the drain pipe cleaning method.

Fig. 21 is a sectional view from F to F in fig. 1 for explaining a flow step of the cleaning liquid in the drain pipe cleaning method in fig. 20.

Fig. 22 is a plan view showing a pipe joint which is a preferable example of the pipe joint in the case where the upstream pipes of both systems are merged with 1 downstream pipe.

Fig. 23 is a front view showing the pipe joint of fig. 22.

Fig. 24 is a rear view showing the pipe joint of fig. 22.

Fig. 25 is a sectional view taken along line G-G of fig. 23.

Fig. 26 is an enlarged cross-sectional view of a pipe including the pipe joint of fig. 22.

Fig. 27 is a plan view showing an example of a piping structure laid in a collective housing for explaining a method of cleaning a drain pipe using the piping of fig. 26.

Fig. 28 is a perspective view showing an inflow side of an exemplary reservoir tank from above.

Fig. 29 is a perspective view showing the outflow side of the reserve tank of fig. 28 from above.

Fig. 30 is a front view showing the inflow side of the reservoir of fig. 28.

FIG. 31 is a rear view showing the outflow side of the reservoir tank of FIG. 28.

Fig. 32 is a plan view showing the reservoir of fig. 28 from above.

Fig. 33 is a bottom view of the reservoir of fig. 28, viewed from below.

Fig. 34 is a sectional view a-a of fig. 30.

Fig. 35 is a sectional view B-B of fig. 30.

Fig. 36 is a cross-sectional view C-C of fig. 31.

Fig. 37 is a right side view showing the reservoir of fig. 30 from the right side.

Fig. 38 is a left side view of the reservoir of fig. 30 from the left side.

Fig. 39 is a cross-sectional view taken along line D-D of fig. 32.

Fig. 40 is a cross-sectional view E-E of fig. 32.

Fig. 41 is a perspective view showing a section F-F of fig. 32 from the inflow side.

Fig. 42 is a perspective view showing a section G-G of fig. 32 from the inflow side.

Fig. 43 is a sectional view H-H of fig. 32.

Fig. 44 is a cross-sectional view I-I of fig. 32.

Fig. 45 is a perspective view showing the inflow side of another exemplary reservoir from above.

Fig. 46 is a schematic system diagram showing an example of a drain system to which the storage tank of the present invention can be applied, in a partial sectional view.

Description of the reference numerals

1. A muffler; 2. a breather pipe; 3. a tubular passageway; 3t, a retrace path; a1, inlet part; 31. a trifurcated branch path; 31a, an inflow passage of the trifurcated branch passage; 31b, one side outflow passage of the three-fork branch passage; 31be, the end of the one-side outflow path; 31c, the other side outflow passage of the three-fork branch passage; 31J, a branch portion; 32. a common wall; 33. (hollow) grooves; 4. a passageway for the vent pipe; 10. a storage tank; 50. a rod-like member; 51. a closure member; 60. a hose for high-pressure cleaning; 61. cleaning the nozzle under high pressure; 70. a cleaning tool; 71. a rod-like member; 72. a brush (closing member); 70A, a linear cleaning tool; 71A, a linear rod-shaped member; 72A, brush (closing member); 70B, cleaning tools with bending habit; 71A, a rod-shaped member having a bending habit; 72A, brush (closing member); 101. a muffler unit; 110. a communicating portion; 120. an inflow pipe; 130. an outflow pipe (siphon drain); 140. an outflow pipe side duct portion; 150. a storage tank-side pipe section; 151. an insertion restriction portion; 160. an exhaust side breather pipe; a1, inlet part; a2, outlet port; a3, an inlet port; m1, lower member; m2, upper member.

Detailed Description

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, "upstream" refers to upstream of the flow of the exhaust water and the flow of the exhaust gas, and "downstream" refers to downstream of the flow of the exhaust water and the flow of the exhaust gas. In the following description, a "top view" refers to a view showing an object from above, and a "bottom view" refers to a view showing an object from below. The "front view" is a view showing the object from the downstream side of the drain flow, and the "rear view" is a view showing the object from the upstream side of the drain flow. The "right side view" is a view showing the object from the upstream side of the exhaust gas flow, and the "left side view" is a view showing the object from the downstream side of the exhaust gas flow.

[ Drain pipe Structure and muffler ]

Fig. 1 is a plan view showing a drain pipe structure C according to an embodiment of the present invention. Fig. 2 is a front view showing a drain pipe structure C.

As shown in fig. 1, the drain pipe structure C includes the storage tank 10 connected to the inflow pipe 120 and the outflow pipe 130, and the communication portion 110 connected to the outflow pipe 130 and the storage tank 10 so that the outflow pipe 130 communicates with the storage tank 10.

In the drain pipe configuration C, the inflow pipe 120 is a water use side pipe leading to a bathtub or the like. In the drain pipe structure C, the outlet pipe 130 is a horizontal pipe arranged substantially without inclination with respect to the horizontal direction. In this example, the outflow pipe 130 functions as a siphon drain pipe. That is, the outflow pipe 130 generates siphon force when discharging water from the water using facility, and can promote the water discharge from the water using side pipe via the storage tank 10.

In the drain pipe structure C, the communication portion 110 includes the muffler 1.

In the drain pipe structure C, the muffler 1 is included in the muffler unit 101. As shown in fig. 2, in the drain pipe structure C, the muffler unit 101 is disposed above the outlet pipe 130.

Fig. 3 is a sectional view a-a of fig. 2. Fig. 3 shows a passage formed in the muffler unit 101.

As shown in fig. 3, in the drain pipe configuration C, the muffler 1 has a tubular passage 3. The tubular passage 3 includes an inlet portion a1 leading to the outflow tube 130 and an outlet portion a2 leading to the reservoir 10.

In the drain pipe structure C, the muffler 1 includes a vent pipe 2 leading to the outlet portion a2 and the reservoir tank 10. In the present embodiment, the muffler unit 101 includes the breather pipe 2 together with the muffler 1.

Communication portion 110 includes an outlet pipe side pipe portion 140 connected to outlet pipe 130 and muffler 1, and a reservoir side pipe portion 150 connected to muffler 1 and reservoir tank 10. The outlet pipe side duct portion 140 is an elbow pipe rising upward from the outlet pipe 130. The reservoir-side pipe portion 150 is a straight pipe extending parallel to the outflow pipe 130.

In the drain pipe structure C, the outflow pipe side pipe portion 140 and the sump side pipe portion 150 are connected to the muffler unit 101, respectively. In the present embodiment, the drain pipe configuration C further includes an exhaust side breather pipe 160.

Fig. 4 is a perspective view showing the outflow pipe side duct portion 140, the sump side duct portion 150, and the exhaust side breather pipe 160 from above. In fig. 4, the storage tank 10 and the muffler unit 101 are omitted. Fig. 5 is a perspective view showing the periphery of the communication portion 110 of the drain pipe structure C from above.

As shown in fig. 4, the outlet-pipe-side conduit portion 140 is an elbow pipe as described above. The outlet pipe side duct portion 140 is formed of a vertical pipe portion 141 rising upward from the outlet pipe 130 and a horizontal pipe portion 142 connected to the vertical pipe portion 141. As shown in fig. 5, in the drain pipe structure C, the vertical pipe portion 141 of the outlet pipe side pipe portion 140 is connected to the outlet pipe 130. Further, as shown in fig. 5, the lateral pipe portion 142 of the outflow pipe side pipe portion 140 is connected to the muffler unit 101. Thereby, as shown in fig. 5, the outflow pipe 130 leads to the muffler unit 101.

As shown in fig. 4, the reservoir-side pipe portion 150 is a straight pipe as described above. As shown in fig. 5, in the drain pipe structure C, one end 150a of the sump-side pipe portion 150 is connected to the muffler unit 101. As shown in fig. 5, the other end 150b of the reservoir-side pipe portion 150 is connected to the reservoir 10. Thereby, as shown in fig. 5, the outflow pipe 130 leads to the storage tank 10 via the muffler unit 101.

As shown in fig. 4, the exhaust-side breather pipe 160 is a straight pipe that opens to the outside. As shown in fig. 5, the exhaust side breather pipe 160 is connected to the muffler unit 101. Thereby, as shown in fig. 5, the outflow pipe 130 is opened to the exhaust side breather pipe 160 via the muffler unit 101. Further, as shown in fig. 5, the storage tank 10 also leads to the exhaust-side breather pipe 160 via the muffler unit 101. That is, the outflow pipe 130 and the storage tank 10 are opened to the outside of each via the exhaust-side breather pipe 160.

Fig. 6 is a plan view showing the muffler unit 101. Fig. 7 is a bottom view of the muffler unit 101. As shown in fig. 6 and 7, the muffler unit 101 is a flat unit. The muffler unit 101 has an inflow-side connecting portion 101 a. The inflow-side connection portion 101a is connected to an outflow-pipe-side conduit portion 140. Fig. 8 is a right side view of the muffler unit 101. As shown in fig. 8, the inflow-side connecting portion 101a of the muffler unit 101 leads to the inlet portion a1 of the tubular passage 3.

Fig. 9 is a left side view of the muffler unit 101. As shown in fig. 9, the muffler unit 101 has a reservoir-side connection 101b and an exhaust-side connection 101 c. The reservoir-side pipe portion 150 is connected to the reservoir-side connecting portion 101 b. Fig. 10 is a rear view of the muffler unit 101. As shown in fig. 10, the reservoir-side connecting portion 101b is opened at one side of the passage 4 of the breather pipe 2. Fig. 11 is a front view of the muffler unit 101. An exhaust-side breather pipe 160 is connected to the exhaust-side connection portion 101 c. As shown in fig. 11, the exhaust-side connection portion 101c is formed with the other side opening of the passage 4 of the breather pipe 2. That is, in the drain pipe structure C, the passage 4 of the exhaust pipe 2 is opened at both the sump-side connection portion 101b and the exhaust-side connection portion 101C.

Fig. 12 is a view corresponding to a section a-a of the muffler unit 101.

As shown in fig. 12, the tubular passage 3 includes an inlet a1 connected to the sound source side, an outlet a2 connected to the outside of the sound source, and a trifurcated branched passage 31 arranged on the inlet a1 side. The inflow passage 31a of the trifurcated branch passage 31 leads to the inlet a 1. The end 31be of the outflow path 31b on one side of the trifurcated branch path 31 is closed. The other side outflow passage 31c of the trifurcated branch passage 31 leads to an outlet portion a 2.

In the muffler 1, the branch portion 31J of the trifurcated branch passage 31 is shaped like a letter T.

As shown in fig. 12, the branch portion 31J is a portion where the inflow passage 31a branches into the one-side outflow passage 31b and the other-side outflow passage 31 c. In other words, the branching portion 31J is a merging portion of 3 passages of the inflow passage 31a, the one-side outflow passage 31b, and the other-side outflow passage 31 c. In the drain pipe configuration C, the inflow passage 31a extends so as to point in the same direction as the one-side outflow passage 31 b. As shown in fig. 12, the other-side outflow passage 31c is connected to the inflow passage 31a and the one-side outflow passage 31b so as to be orthogonal to the inflow passage 31a and the one-side outflow passage 31b in a plan view. In the drain pipe structure C, an inlet port a3 leading to the other side outflow path 31C is formed between the inflow path 31a and the one side outflow path 31 b. Thus, as shown in fig. 12, the branch portion 31J of the three-pronged branch passage 31 is formed in a letter T shape in which the other-side outflow passage 31c is connected to the inflow passage 31a and the one-side outflow passage 31b so as to be orthogonal to the inflow passage 31a and the one-side outflow passage 31b in a plan view.

As shown in fig. 12, when the three-pronged branched passage 31 is provided on the inlet a1 side of the tubular passage 3, the sound input from the inlet a1 becomes a synthesized wave in which the input wave traveling in the inflow passage 31a and the reflected wave rebounding at the end 31be of the one-side outflow passage 31b are synthesized. The composite wave is further guided to the other-side outflow passage 31c through the inlet a 3. This makes it possible to change the frequency distribution of the sound input from the inlet a1 to a frequency band side (low frequency side in this example) where the sound is easily attenuated. When the length from the inlet port A3 to the tip end 31be of the one-side outflow passage 31b in the three-pronged branch passage 31 (the depth dimension of the one-side outflow passage 31 b) is L1, the length L1 can be set appropriately according to the shape, size, dimension, and the like of the inlet port a1, the outlet port a2, and the three-pronged branch passage 31. A specific example of the length L1 is about 20 mm.

In the muffler 1, the tubular passage 3 includes a small cross-sectional area portion having a cross-sectional area smaller than the cross-sectional area SA1 of the inlet portion a 1.

As shown in fig. 12, the cross-sectional area S31a of the inflow passage 31a of the three-pronged branch passage 31 is smaller than the cross-sectional area SA1 of the inlet a 1. The cross-sectional area S31b of the one-side outflow passage 31b of the three-branched passage 31 is also smaller than the cross-sectional area SA1 of the inlet a 1. In the present embodiment, the cross-sectional area S31a of the inflow passage 31a and the cross-sectional area S31b of the one-side outflow passage 31b become smaller toward the tip 31be of the one-side outflow passage 31 b. The cross-sectional area SA3 of the inlet port a3 is smaller than the cross-sectional area S31a of the inflow passage 31 a. Similarly, the cross-sectional area S31c of the other-side outflow passage 31c of the three-pronged branch passage 31 is smaller than the cross-sectional area SA1 of the inlet a 1. That is, in the drain pipe structure C, the entire three-pronged branch passage 31 is a small cross-sectional area portion. However, according to the present invention, the small cross-sectional area portion may be provided at least in a part of the tubular passage 3. Further, the relationship between the cross-sectional area SA1 of the inlet a1 and the cross-sectional area of the small cross-sectional area portion provided in the tubular passage 3 can be set as appropriate in relation to the shapes, sizes, dimensions, and the like of the inlet a1, the outlet a2, and the trifurcated branch passage 31. As a specific example, the inner diameter of the inlet a1 corresponds to 25A, and the inner diameter of the inlet A3 of the trifurcated branched passage 31 corresponds to 13A.

Further, in the muffler 1, the tubular passage 3 is provided with a folded-back passage 3 t.

According to the present invention, at least 1 folded passage 3t may be provided at least in a part of the tubular passage 3. As shown in fig. 12, in the drain pipe structure C, a plurality of (5 in this example) folded back passages 3t are provided in the trifurcated branch passage 31. Thus, in the present embodiment, the length (distance) of the small cross-sectional area portion is ensured to be longer while the size of the muffler 1 is compactly controlled.

More specifically, the other-side outflow passage 31c of the three-pronged branch passage 31 is folded back in the direction returning along the inflow passage 31a via the introduction portion a 3. That is, in the present embodiment, the folded passage 3t is formed near the inlet a3 of the trifurcated branch passage 31. Thereby, the inflow passage 31a and the other-side outflow passage 31c of the three-pronged branch passage 31 form two extended passages communicating via the folded-back passage 3 t. In the drain pipe structure C, the inflow passage 31a and the other-side outflow passage 31C of the three-pronged branch passage 31 extend at a certain angle α 0 so as to be mutually expanded with the folded passage 3t as a base point in a plan view.

In the drain pipe structure C, the other-side outflow passage 31C of the three-pronged branch passage 31 includes 3 folded passages 3 t. Thus, in the drain pipe structure C, the adjacent passage 31C1 of the other-side outflow passage 31C, which is adjacent to the other-side outflow passage 31C, forms two extended passages that communicate via the folded-back passage 3 t. As shown in fig. 12, the two adjacent passages 31c1 also extend at a constant angle α 0 so as to be mutually spread apart from the folded passage 3t as a base point in a plan view. Thus, according to the present embodiment, the length of the two adjacent passages 31c1 can be made longer in accordance with the installation angle α 0, and therefore the length of the small cross-sectional area portion can be made longer. However, according to the present invention, the two adjacent passages 31c1 can also extend parallel to each other.

In the drain pipe structure C, the exhaust-side connection portion 101C side of the passage 4 of the breather pipe 2 is folded back in a direction returning along the other outflow passage 31C of the trifurcated branch passage 31 via the outlet portion a 2. That is, in the drain pipe structure C, the folded-back passage 3t is also formed near the outlet portion a2 of the trifurcated branch passage 31. Thereby, the other side outflow passage 31c of the three-pronged branch passage 31 and the passage 4 of the breather pipe 2 form two extended passages communicating via the folded-back passage 3 t. In the drain pipe structure C, the other-side outflow passage 31C of the three-pronged branch passage 31 and the passage 4 of the breather pipe 2 also extend at a certain angle α 0 so as to be mutually expanded with the folded passage 3t as a base point in a plan view. Thereby, in the drain pipe configuration C, the length of the small cross-sectional area portion is ensured to be longer while compactly controlling the size of the muffler unit 101. However, according to the present invention, the other side outflow passage 31c of the trifurcated branch passage 31 and the passage 4 of the breather pipe 2 can extend in parallel to each other.

The position and number of the folded passages 3t can be appropriately set according to the shape, size, dimension, and the like of the inlet a1, the outlet a2, and the trifurcated branch passage 31. For example, the position and the number of the folded passages 3t can be set so as not to interfere with or project beyond members (the reservoir 10 and the outlet pipe 130 in this example) disposed around the muffler 1. Specifically, the position and number of the folded passages 3t may be set so that the total length of the other outflow passage 31c of the trifurcated branch passage 31 is 363mm or more. However, according to the present invention, the length (distance) of the small cross-sectional area portion may be secured to be longer without providing the folded passage 3 t.

In the drain pipe structure C, the outlet a2 is disposed above the inlet a 1. Thus, in the present embodiment, the bottom of the tubular passage 3 is formed such that the bottom of the tubular passage 3 is inclined downward toward the inlet a 1.

Fig. 13 is a sectional view B-B of fig. 6. Here, the B-B section is a section including the central axis O1 of the inlet portion a1 when viewed from above as shown in fig. 12. Further, fig. 14 is a C-C sectional view of fig. 6. Here, the C-C section is a section including the center axis O2 of the outlet portion a2 when viewed from above as shown in fig. 12.

As shown in fig. 13 and 14, in the drain pipe structure C, the bottom portion (lower end) E2 of the outlet portion a2 is arranged above the bottom portion (lower end) E1 of the inlet portion a 1. As shown in fig. 13 and 14, the bottom portion (lower end) E3 of each tubular passage 3 is formed such that an imaginary line L31 connecting the bottom portions E3 of the tubular passages 3 is inclined downward at an angle α 1 toward the inlet portion a1 with respect to the horizontal axis Oy when viewed from the upstream direction (downstream direction) on the drain side. Thereby, the bottom E3 of the tubular passage 3 is formed such that the bottom E3 of the tubular passage 3 is inclined downward at an angle α 1 toward the inlet a1 between the outlet portion a2 and the inlet portion a 1. Specific examples of the angle α 1 include α 1 being 3 °.

Fig. 15 is a cross-sectional view taken along line D-D of fig. 6. Here, the D-D cross section is a cross section of the inflow passage 31a passing through the trifurcated branch passage 31 when viewed from above as shown in fig. 12. Further, fig. 16 is a sectional view E-E of fig. 6. Here, the E-E section is a section passing through the other side outflow passage 31c of the trifurcated branch passage 31 when viewed from above as shown in fig. 12.

As shown in fig. 15 and 16, in the drain pipe structure C, the bottom portion (lower end) E3 of each tubular passage 3 is formed to be inclined downward at an angle α 2 toward the inlet portion a1 with respect to the horizontal axis Oy as viewed from the upstream direction (downstream direction) on the air-passing side. In the present embodiment, the bottom portion E3 of the inflow passage 31a of the three-pronged branch passage 31 and the bottom portion E3 of each extension passage 31c1 of the other-side outflow passage 31c of the three-pronged branch passage 31 are each formed such that the bottom portion E3 of the tubular passage 3 is inclined downward at an angle α 2 toward the inlet a2 between the outlet portion a2 and the inlet portion a 1. A specific example of the angle α 2 is α 2 — 1 °.

Further, in the muffler 1, the tubular passage 3 is provided with two extended passages communicating via the folded-back passage 3 t. The mutually adjacent via sidewalls of the two extended vias are common walls 32.

As shown in fig. 12, the tubular passage 3 is provided with an inflow passage 31a and the other-side outflow passage 31c of the trifurcated branch passage 31 communicating via the folded passage 3t as the two extension passages. The passage side walls of the inflow passage 31a and the other-side outflow passage 31c adjacent to each other are a common wall 32. As shown in fig. 12, the other-side outflow passage 31c of the three-pronged branch passage 31 includes, as the two extension passages, two extension passages 31c1 that communicate with each other via the folded-back passage 3 t. The passage side walls of the two extended passages 31c1 adjacent to each other are the common wall 32. The tubular passage 3 includes, as the two extension passages, the other-side outflow passage 31c of the trifurcate branch passage 31 and the passage 4 of the breather pipe 2, which communicate with each other via the folded-back passage 3 t. The other-side outflow passage 31c of the three-pronged branch passage 31 and the passage side wall of the passage 4 of the breather pipe 2 adjacent to each other are also the common wall 32.

As shown in fig. 12, in the drain pipe configuration C, 5 common walls 32 are provided in the muffler unit 101. As shown in fig. 12, each of the common walls 32 is a part of the adjacent passage side wall of the two extended passages in a plan view. However, according to the present invention, the common wall 32 formed on the mutually adjacent passage side walls of the inflow passage 31a and the other-side outflow passage 31c of the three-pronged branch passage 31 can be provided as the entire passage side walls. Further, according to the present invention, the common wall 32 formed on the passage side wall adjacent to the two extension passages 31c1 of the other-side outflow passage 31c of the three-pronged branch passage 31 can be provided as the entire passage side wall. Further, according to the present invention, the common wall 32 formed on the adjacent passage side walls of the other-side outflow passage 31c of the trifurcated branch passage 31 and the passage 4 of the air passage 2 can be provided as the entire passage side walls.

Fig. 17 is a perspective bottom view showing the muffler unit 101 from below.

In the present embodiment, the common wall 32 is hollow by the groove 33.

In the present embodiment, as shown in fig. 17, each of the 5 common walls 32 is hollow by a groove 33 formed in the outer surface of the muffler unit 101.

Further, the muffler 1 is formed of a lower member M1 and an upper member M2 attached to the lower member M1.

In the drain pipe configuration C, the muffler 1 is formed of the lower member M1 and the upper member M2 attached to the lower member M1 as a muffler unit 101 including the snorkel 2.

Fig. 18 is a perspective view showing the lower member M1 from above.

As shown in fig. 18, the tubular passage 3 and the passage 4 of the breather pipe 2 are formed by grooves formed in the lower member M1. A flange portion 34 is provided on the surface of the lower member M1 that abuts the upper member M2, and the flange portion 34 ensures the area of engagement between the lower member M1 and the upper member M2. In addition, the lower member M1 is provided with a projection 35, and the projection 35 is used for fitting the upper member M2. In the present embodiment, the convex portion 35 is provided on the upper end surface of the common wall 32.

Fig. 19 is a perspective view showing the upper member M2 from below.

As shown in fig. 19, in the muffler 1, the upper side member M2 is a flat member.

As shown in fig. 19, a recess 36 is provided on the back surface of the upper member M2, and the recess 36 is used for fitting the upper member M2. The concave portion 36 is fitted to the convex portion 35 of the lower member M1, whereby the lower member M1 and the upper member M2 can be aligned and the upper member M2 can be fixed to the lower member M1. In the present embodiment, as shown in fig. 6, a rib 37 is provided on the surface of the upper member M2. The rib 37 can reinforce the upper member M2 and also prevent the upper member M2 from warping when the upper member M2 is injection molded, for example.

There is still room for improvement in the conventional drain pipe structure in terms of suppressing abnormal noise generated when water is drained from a siphon drain pipe connected to a storage tank.

In contrast, the drain pipe structure C includes the storage tank 10 connected to the inflow pipe 120 and the outflow pipe 130, and the communication portion 110 connected to the outflow pipe 130 and the storage tank 10 so that the outflow pipe 130 communicates with the storage tank 10.

According to the drain pipe structure C, the storage tank 10 and the outlet pipe 130 connected to the storage tank 10 are communicated with each other via the communication portion 110, and the communication portion 110 is used as a vent pipe for the outlet pipe 130, whereby occurrence of abnormal noise in the outlet pipe 130 when air is sucked together with drain water at the connection portion with the storage tank 10 can be suppressed. As described above, according to the present embodiment, the occurrence of abnormal noise at the time of drainage from the outlet pipe 130 can be suppressed by the novel structure in which the communicating portion 110 serving as the vent pipe for the outlet pipe 130 merges into the reservoir tank 10.

Therefore, the drain pipe structure C is a novel drain pipe structure in which abnormal noise is suppressed. Further, according to the present embodiment, the communication portion 110 leading to the outflow pipe 130 is caused to merge with the storage tank 10, so that the ventilation path of the outflow pipe 130 and the ventilation path of the storage tank 10 can be shared. Therefore, the drain pipe structure C of the present embodiment is a drain pipe structure in which space is saved by reducing the piping system.

In the drain pipe structure C, the communication portion 110 includes the muffler 1, the muffler 1 includes the tubular passage 3, and the tubular passage 3 includes the inlet portion a1 leading to the outlet pipe 130 and the outlet portion a2 leading to the reservoir tank 10. In this case, even if abnormal noise occurs during drainage, the abnormal noise can be reduced by the muffler 1. Therefore, in this case, abnormal noise can be further suppressed.

More specifically, if the storage tank 10 and the outlet pipe 130 connected to the storage tank 10 are communicated by the communication portion 110 as described above, it is possible to suppress the generation of abnormal noise in the outlet pipe 130 when air is sucked into the connection portion connected to the storage tank 10 together with the drain.

However, when the communication portion 110 communicates the reservoir tank 10 and the outlet pipe 130, the communication portion 110 may suck air together with the drain water at a connection portion with the outlet pipe 130, thereby generating a new noise.

However, in practice, the abnormal noise is smaller than that generated when the outflow pipe 130 sucks air together with the drain water at the connection portion thereof connected to the reservoir tank 10.

However, the sound in the storage tank 10 is sometimes liable to be reverberated. Therefore, when the abnormal noise generated at the connection portion between the communication portion 110 and the outlet pipe 130 propagates through the communication portion 110 into the reservoir tank 10, the abnormal noise may be reflected in the reservoir tank 10 and may leak from the reservoir tank 10 to the outside. The degree of such abnormal noise varies depending on the size, shape, and the like of the reserve tank 10. For example, if the capacity of the reservoir tank 10 is increased and the rigidity of the central portion of the reservoir tank 10 is lowered, the abnormal noise may further reverberate in the reservoir tank 10.

In contrast, in the drain pipe structure C, the communication portion 110 includes the muffler 1. In this case, even when the communication portion 110 sucks air together with the drain water at the connection portion thereof connected to the outflow pipe 130 to generate abnormal noise, the abnormal noise propagated through the communication portion 110 can be reduced. That is, according to the present embodiment, by reducing the abnormal noise that propagates to the reservoir tank 10 through the communication portion 110, the abnormal noise generated in the reservoir tank 10 can be suppressed. Therefore, according to the present embodiment, abnormal noise can be further suppressed.

In the present embodiment, the muffler 1 includes the vent pipe 2 leading to the outlet portion a2 and the storage tank 10. In this case, the abnormal noise propagating to the tubular passage 3, that is, the abnormal noise propagating to the reservoir tank 10 can be further suppressed. Therefore, according to the present embodiment, abnormal noise can be suppressed more effectively. In the drain pipe structure C, an exhaust side breather pipe 160 is connected to the breather pipe 2. In this case, the air flowing out of the pipe 130 and the storage tank 10 can be circulated to the outside air located at a position farther from the storage tank 10.

In the present embodiment, the tubular passage 3 includes the three-pronged branch passage 31 connected to the sound source side on the inlet a1 side, the inflow passage 31a of the three-pronged branch passage 31 leads to the inlet a1, the tip 31be of the outflow passage 31b on one side of the three-pronged branch passage 31 is closed, and the outflow passage 31c on the other side of the three-pronged branch passage 31 leads to the outlet a2 connected to the side other than the sound source.

When an abnormal noise from the outflow pipe 130 is input to the inflow passage 31a of the three-pronged branch passage 31, a part of the frequency of the abnormal noise bounces back toward the inflow passage 31a at the end 31be of the outflow passage 31b on one side of the three-pronged branch passage 31. This allows the abnormal sound input to the trifurcated branch passage 31 to change to a frequency band in which sound is easily attenuated. Specifically, the peak sound pressure of the abnormal sound can be changed from a frequency band of 400 to 600Hz to a low frequency band of 200 to 400 Hz. Therefore, in this case, abnormal noise can be suppressed more effectively.

In the present embodiment, the tubular passage 3 includes a small cross-sectional area portion having a cross-sectional area smaller than the cross-sectional area SA1 of the inlet a 1.

The smaller the cross-sectional area of the tubular passage 3 is, the more the sound pressure of the abnormal sound propagating to the tubular passage 3 can be reduced. That is, the smaller the cross-sectional area of the tubular passage 3 is, the more the sound pressure of the abnormal sound generated by the communicating portion 110 sucking air together with the drain water at the connecting portion with the outflow pipe 130 can be reduced.

According to the present embodiment, the tubular passage 3 includes a small cross-sectional area portion having a cross-sectional area smaller than the cross-sectional area SA1 of the inlet portion a 1. This can reduce the sound pressure of abnormal noise generated when the communicating portion 110 sucks air together with the drain water at the connecting portion with the outflow pipe 130. Therefore, in this case, abnormal noise can be suppressed more effectively.

In the present embodiment, the tubular passage 3 includes a folded passage 3 t.

The longer the length of the tubular passage 3, the more the low frequency band of the abnormal sound propagating to the tubular passage 3 can be attenuated. That is, the longer the length of the tubular passage, the more the communication portion 110 can attenuate a low frequency band of abnormal noise generated by the intake of air together with the drain water at the connection portion with the outlet pipe 130.

According to the present embodiment, the tubular passage 3 is provided with the folded passage 3t, so that the length of the tubular passage 3 can be ensured to be longer. Therefore, in this case, the length of the tubular passage 3 is ensured to be long, and the sound pressure of the low frequency band can be attenuated. Therefore, in this case, abnormal noise can be suppressed more effectively. Further, by ensuring the length of the tubular passage 3 to be long by the folded-back passage 3t, the entire muffler unit 101 (muffler 1) and, therefore, the entire drain pipe structure C can be made compact.

The muffler 1 is provided with a breather pipe 2 leading to the outlet portion a 2. In this case, the abnormal noise propagating to the tubular passage 3 can be further suppressed. Therefore, in this case, abnormal noise can be suppressed more effectively.

In the present embodiment, the tubular passage 3 includes the three-pronged branch passage 31 on the inlet a1 side, the inflow passage 31a of the three-pronged branch passage 31 leads to the inlet a1, the tip 31be of the one-side outflow passage 31b of the three-pronged branch passage 31 is closed, the other-side outflow passage 31c of the three-pronged branch passage 31 leads to the outlet a2, and the other-side outflow passage 31c includes a small cross-sectional area portion having a cross-sectional area S31c smaller than the cross-sectional area SA1 of the inlet a 1. In this case, the frequency band of the abnormal noise can be changed to a frequency band in which the sound is easily attenuated, and the sound pressure of the abnormal noise can be reduced, so that the abnormal noise can be suppressed more effectively.

In the present embodiment, the tubular passage 3 includes the three-pronged branch passage 31 on the inlet a1 side, the inflow passage 31a of the three-pronged branch passage 31 leads to the inlet a1, the tip 31be of the one-side outflow passage 31b of the three-pronged branch passage 31 is closed, the other-side outflow passage 31c of the three-pronged branch passage 31 leads to the outlet a2, and the other-side outflow passage 31c includes the folded passage 3 t. In this case, the frequency band of the abnormal noise can be changed to a frequency band in which the sound is easily attenuated, and particularly, the sound pressure in the low frequency band can be attenuated, so that the abnormal noise can be more effectively suppressed.

In the present embodiment, the tubular passage 3 includes the three-way branch passage 31 on the inlet a1 side, the inflow passage 31a of the three-way branch passage 31 leads to the inlet a1, the tip 31be of the one-side outflow passage 31b of the three-way branch passage 31 is closed, the other-side outflow passage 31c of the three-way branch passage 31 leads to the outlet a2, and the other-side outflow passage 31c includes a small cross-sectional area portion having a cross-sectional area smaller than the cross-sectional area SA1 of the inlet a1 and the folded passage 3 t. In this case, the frequency band of the abnormal noise can be changed to a frequency band in which the sound is easily attenuated, and the sound pressure of the abnormal noise can be reduced.

In the present embodiment, the outlet portion a2 is disposed above the inlet portion a1, and the bottom E3 of the tubular passage 3 is formed such that the bottom E3 of the tubular passage 3 is inclined downward toward the inlet portion a 1. In the present embodiment, as described above, the tilt angle is set to the angle α 1 and the angle α 2. In this case, it is possible to suppress inflow of liquid from the inlet portion a1, and it is also possible to easily discharge liquid such as washing water from the inlet portion even if the liquid flows in. That is, in this case, inflow and stagnation of the liquid can be suppressed. In particular, in the present embodiment, the tubular passage 3 is folded back at an angle α 0 with the folded-back passage 3t as a base point. Thus, in the present embodiment, as shown in fig. 12, the inflow passage 31a, the other-side outflow passage 31c (adjacent passage 31c1), and the passage 4 of the breather pipe 2 of the three-pronged branch passage 31 are inclined at an angle α 1 × (1/2) with respect to the central axis O1 of the inlet a1, respectively, in a plan view. In this case, even if the liquid flows into the tubular passage 3, the liquid can be guided toward the inlet portion a 1.

In the present embodiment, communication portion 110 includes an outlet pipe side duct portion 140 connected to outlet pipe 130 and muffler 1, and a reservoir tank side duct portion 150 connected to muffler 1 and reservoir tank 10, and outlet pipe side duct portion 140 is a bent pipe rising upward from outlet pipe 130, and reservoir tank side duct portion 150 is a straight pipe extending parallel to outlet pipe 130. In this case, it is assumed that the inflow of liquid from the inlet a1 can be suppressed and the liquid can be easily discharged from the inlet a1 even if the liquid flows in. That is, in this case, inflow and stagnation of the liquid can be suppressed. In this case, the communication portion 110 has a compact duct structure, and therefore the entire drain pipe structure C can be made compact.

In the present embodiment, the branch portion 31J of the trifurcated branch passage 31 has a T-letter shape. In this case, the inflow passage 31a of the three-pronged branch passage 31 and the one-side outflow passage 31b of the three-pronged branch passage 31 merge with each other on a straight line, and thereby the abnormal sound input from the inflow passage 31a and the abnormal sound rebounded from the one-side outflow passage 31b of the three-pronged branch passage 31 can be effectively cancelled. Therefore, in this case, abnormal noise can be suppressed more effectively.

In the present embodiment, the outflow pipe 130 is a siphon drain pipe. The outflow pipe 130 is a siphon drain pipe arranged in a state of substantially no inclination with respect to the horizontal direction. As described above, the siphon drain pipe may cause abnormal noise by sucking air together with drain water at the connection portion with the reservoir tank 10. In this case, it is effective to suppress abnormal noise.

In addition, in the present embodiment, in the muffler 1, the tubular passage 3 is provided with two extension passages communicating via the folded passage 3t, and the passage side walls of the two extension passages adjacent to each other are the common wall 32. In this case, the entire muffler 1 can be made compact.

In the present embodiment, the common wall 32 is hollow in the groove 33 in the muffler 1. In this case, the muffler 1 can be easily manufactured by injection molding. Particularly, in the present embodiment, the muffler 1 forms the muffler unit 101 together with the breather pipe 2. Therefore, in the present embodiment, the muffler unit 101 can be easily manufactured by injection molding together with the muffler 1 and the breather pipe 2.

Further, in the present embodiment, the muffler 1 is formed of the lower member M1 and the upper member M2 attached to the lower member M1. In this case, by forming the lower member M1 and the upper member M2 from two members, it is possible to injection-mold the lower member M1 and the upper member M2, respectively.

In the present embodiment, the upper member M2 is a flat member in the muffler 1. In this case, since the positions of the mounting surfaces (abutting surfaces) of the lower member M1 and the upper member M2 can be set at high positions, leakage of liquid through the mounting surfaces can be suppressed.

[ method of cleaning Drain pipe ]

Next, a drain pipe cleaning method will be described with reference to the above-described drain pipe structure C.

In the present embodiment, the drain pipe cleaning method is a drain pipe cleaning method in which a drain pipe connected to a breather pipe via a connecting pipe portion is cleaned by flowing a cleaning liquid into the drain pipe.

In the present embodiment, the drain pipe cleaning method includes the steps of: a step of closing an opening portion, which leads to the connection duct portion, formed in the ventilation pipe with a closing member by inserting a rod-shaped member provided with the closing member into a passage of the ventilation pipe (hereinafter also referred to as an "opening portion closing step"); and a step of flowing a cleaning liquid to the passage of the drain pipe after the opening portion is closed (hereinafter also referred to as a "cleaning liquid flowing step").

Referring to the drain pipe structure C described above, in the present embodiment, the vent pipe is the vent pipe 2 of the muffler unit 101. In this example, the breather pipe also includes a discharge side breather pipe 160. In the present embodiment, the connection duct portion is composed of a drain-side duct portion 140, a muffler unit 101, a sump-side duct portion 150, and an exhaust-side breather pipe 160. In the present embodiment, the opening is the outlet portion a2 of the muffler 1.

The rod-shaped member provided with the closing member is a wire tool that can be inserted into a pipe. Specific examples of the rod-shaped member include single or twisted wires. The wire includes a metal wire, needless to say, a synthetic resin wire. Specific examples of the blocking member include a brush formed by binding linear members such as bristles, an elastic member such as rubber, and a porous member such as sponge.

Fig. 20 is an enlarged cross-sectional view of fig. 3 for explaining the opening closing step.

In fig. 20, reference numeral 50 is a rod-like member. In this example a metal wire. In this example, the rod member 50 has flexibility. Reference numeral 51 is a closing member. In this example, the closure member 51 is a brush.

As shown in fig. 20, in the opening closing step, the rod-like member 50 is inserted into the passage 4 of the snorkel 2, thereby closing the outlet portion a2 of the muffler 1 with the closing member 51.

Fig. 21 is a sectional view F-F of fig. 1 for explaining a cleaning liquid flowing step.

In fig. 21, reference numeral 60 denotes a high-pressure cleaning hose provided with a high-pressure cleaning nozzle 61. In this example, the hose 60 has flexibility. The high-pressure cleaning hose 60 includes not only a synthetic resin hose but also a metal hose.

After the outlet portion a2 of the muffler 1 is closed, as shown in fig. 21, in the cleaning liquid flowing step, the high-pressure cleaning nozzle 61 is inserted into the passage of the outlet pipe 130. The cleaning liquid is injected from the high-pressure cleaning nozzle 61 in a high-pressure state toward the downstream of the outflow pipe 130. This allows the outflow pipe 130 to be cleaned.

As described above, according to the present embodiment, in the opening closing step, the rod-like member 50 is inserted into the passage 4 of the snorkel 2, whereby the outlet portion a2 of the muffler 1 formed in the snorkel 2 can be closed by the closing member 51 provided in the rod-like member 50. This can block the passage 4 of the ventilation path 2 from the passage leading to the outflow tube 130. Next, according to the present embodiment, after the outlet portion a2 is closed, the cleaning liquid is caused to flow into the passage of the outflow pipe 130 in the cleaning liquid flowing step. This allows the passage of the outflow pipe 130 to be cleaned, thereby cleaning the outflow pipe 130. The high-pressure cleaning nozzle 61 is inserted into the passage of the outlet pipe 130, and the cleaning liquid can be injected into the passage of the outlet pipe 130 from the high-pressure cleaning nozzle 61.

According to the present embodiment, the cleaning liquid from the outflow pipe 130 is prevented from flowing into the breather pipe 2 by the closing member 51. Therefore, according to the drain pipe cleaning method of the present embodiment, the drain pipe can be cleaned without allowing the cleaning liquid to flow into the breather pipe 2.

In the drain pipe cleaning method according to the present embodiment, as shown in fig. 21, the vent pipe 2 is located higher than the outflow pipe 130. In this case, the inflow of the cleaning liquid into the breather pipe 2 is more reliably prevented, and further, it is assumed that the cleaning liquid can be easily discharged even if it flows in. That is, in this case, the inflow and stagnation of the cleaning liquid can be suppressed.

In the drain pipe cleaning method according to the present embodiment, as shown in fig. 20, the vent pipe 2 extends horizontally from the insertion port of the rod-like member 50 formed in the vent pipe 2 to the outlet portion a2 of the muffler 1. In this case, since no level difference is generated in the section leading to the outlet portion a2 of the muffler 1, the closing member 51 easily passes through the passage 4 of the breather pipe 2. That is, the work of closing the outlet portion a2 leading to the muffler 1 for cleaning the outlet pipe 130 can be easily performed. Therefore, in this case, the outlet duct 130 can be easily cleaned.

In the present embodiment, as shown in fig. 20, in the drain pipe cleaning method, the closing member 51 is a brush. In this case, the brush is flexible, and the closing member 51 can be easily inserted through the passage 4 of the breather pipe 2. Therefore, the work of closing the outlet portion a2 leading to the muffler 1 can be easily performed. Therefore, in this case, the outlet duct 130 can be easily cleaned. In this case, dirt such as liquid and dust adhering to the passage 4 of the breather pipe 2 (including the passage of the exhaust-side breather pipe 160) can be deflected. Therefore, in this case, the outflow pipe 130 can be cleaned and the ventilation pipe 2 can be cleaned. Further, the brush preferably has water absorbency. In this case, since the liquid such as the cleaning liquid attached to the passage 4 of the breather pipe 2 can be removed, the breather pipe 2 can be cleaned efficiently.

In the drain pipe cleaning method according to the present embodiment, as shown in fig. 20, the vent pipe 2 includes an insertion restriction portion 151 that can be brought into contact with the rod member 50 at a position on the opposite side of the insertion port of the rod member 50 with respect to the outlet portion a2 leading to the muffler 1 in the passage 4 of the vent pipe 2. In this case, the closing member 51 can be positioned at a position suitable for closing the outlet portion a2 as shown in fig. 20 by a simple operation of simply inserting the rod-like member 50 through the passage 4 of the breather pipe 2. That is, the work of closing the outlet portion a2 leading to the muffler 1 for cleaning the outlet pipe 130 can be easily performed. Therefore, in this case, the outlet duct 130 can be easily cleaned. As shown in fig. 4, in the present embodiment, the insertion restriction portion 151 is a distal end portion of the reservoir-side pipe portion 150. In the present embodiment, the reservoir-side pipe section 150 is a cylindrical member whose distal end portion is closed. The reservoir-side duct portion 150 has an opening a4 leading to the reservoir 10. The insertion restriction portion 151 is not limited to the end portion as the seal wall in the present embodiment. For example, the insertion restriction portion 151 may be a protrusion provided in the reservoir-side pipe portion 150.

In the present embodiment, as shown in fig. 20, in the drain pipe cleaning method, the connecting pipe portion includes a muffler 1. In this case, the outlet pipe 130 connected to the muffler 1 can be easily cleaned.

In the present embodiment, as shown in fig. 21, in the drain pipe cleaning method, the outflow pipe 130 is connected to the storage tank 10, and the vent pipe 2 is connected to the same storage tank as the storage tank 10. In this case, the number of the plurality of ventilation pipes can be reduced by collecting the plurality of ventilation pipes, and the ventilation pipe 130 can be cleaned.

In the present embodiment, in the drain pipe cleaning method, the outflow pipe 130 is a siphon drain pipe.

Generally, the breather pipe does not assume the passage of the water supply, and the inflow and retention of water are not preferable. In particular, in the present embodiment, the outlet pipe 130 is a lateral siphon drain pipe in which the outlet pipe 130 is disposed in a state of substantially no inclination with respect to the horizontal direction. In this case, the drain water filled in the siphon drain pipe becomes resistance to the high-pressure cleaning water, and the risk of the high-pressure cleaning water or the like flowing into the breather pipe 2 further increases. Therefore, when the outflow pipe 130 is a siphon drain pipe, the inflow and retention of the cleaning liquid are effectively suppressed.

[ pipe joints ]

In addition, if two upstream pipes are merged with 1 downstream pipe, space can be saved by reducing the piping system.

However, when the cleaning tool is inserted from the downstream pipe, it is difficult to select a desired upstream pipe to insert the cleaning tool.

Fig. 22 is a plan view showing a pipe joint 20 as a preferred example of the pipe joint in the case where two upstream pipes are merged into 1 downstream pipe. Fig. 23 is a front view showing the pipe joint 20. Fig. 24 is a rear view showing the pipe joint 20. Fig. 25 is a sectional view taken along line G-G of fig. 23.

As shown in fig. 22, the pipe joint 20 includes a1 st upstream pipe portion 21 connectable to a1 st upstream pipe, a2 nd upstream pipe portion 22 connectable to a2 nd upstream pipe, and a downstream pipe portion 23 connectable to 1 downstream pipe. Further, as shown in fig. 25, the passage 21a of the 1 st upstream duct portion 21 and the passage 22a of the 2 nd upstream duct portion 22 lead to the passage 23a of the downstream duct portion 23. And, the 1 st upstream duct portion 21 is oriented with respect to the downstream duct portion 23 in such a manner as to point in the same direction as the downstream duct portion 23.

Specifically, the passage extension axis O21 of the 1 st upstream duct portion 21 is separated in parallel by Δ Y in the horizontal direction with respect to the passage extension axis O23 of the downstream duct portion 23.

According to the pipe joint 20, for example, when a linear rod-shaped cleaning tool is used as the cleaning tool inserted from the downstream pipe portion 23, the cleaning tool is easily inserted into the 1 st upstream pipe portion 21 parallel to the downstream pipe portion 23 out of the 1 st upstream pipe portion 21 and the 2 nd upstream pipe portion 22. Further, according to the pipe joint 20, for example, when a cleaning tool in the shape of a rod having a curling habit is used as the cleaning tool inserted from the downstream pipe portion 23, the cleaning tool is easily inserted into the 2 nd upstream pipe portion 22, which is not parallel to the downstream pipe portion 23, of the 1 st upstream pipe portion 21 and the 2 nd upstream pipe portion 22. Therefore, according to the pipe joint 20, a desired upstream pipe portion for inserting the cleaning tool can be easily selected from the 1 st upstream pipe portion 21 and the 2 nd upstream pipe portion 22 without visually checking the 1 st upstream pipe portion 21 and the 2 nd upstream pipe portion 22. Therefore, according to the pipe joint 23, without visually observing the two upstream pipe portions, i.e., the 1 st upstream pipe portion 21 and the 2 nd upstream pipe portion 22, which join the 1 downstream pipe portion 23, a desired upstream pipe portion for inserting a cleaning tool or the like can be easily selected from the two upstream pipe portions.

Further, it is preferable that, in the pipe joint 23, the 2 nd upstream pipe portion 22 is oriented in a direction pointing to an angle α 12 forming an acute angle with the 1 st upstream pipe portion 21. In this case, since the cleaning tool or the like is easily inserted from the downstream pipe portion 23 into the 1 st upstream pipe portion 21 and the 2 nd upstream pipe portion 22, a desired upstream pipe portion can be more easily selected.

In the pipe joint 20, the acute angle α 12 is an angle in the range of 15 ° to 25 °. In this case, more cleaning tools of different sizes and the like can be easily inserted.

Further, in the pipe joint 20, as described above, the passage extension axis O21 of the 1 st upstream pipe portion 21 is offset with respect to the passage extension axis O23 of the downstream pipe portion 23. In this case, by adjusting the interval between the passage extension axis O21 of the 1 st upstream pipe portion 21 and the passage extension axis O23 of the downstream pipe portion 23, the balance between the ease of insertion of the cleaning tool or the like into the 1 st upstream pipe portion 21 and the ease of insertion of the cleaning tool or the like into the 2 nd upstream pipe portion 22 can be easily set to a desired balance.

[ method of cleaning pipes ]

Fig. 26 is an enlarged cross-sectional view of a pipe 200 provided with the pipe joint 20.

In fig. 26, reference numeral 210 is a1 st upstream pipe 210 connected to the 1 st upstream pipe portion 21 of the pipe joint 20. Reference numeral 220 is a2 nd upstream pipe 220 connected to the 2 nd upstream pipe portion 22 of the pipe joint 20. And, reference numeral 230 is a downstream pipe 230 connected to the downstream pipe portion 23 of the pipe joint 20.

The conduit 200 can be purged of the desired upstream conduit using the following method.

The method of cleaning the duct 200 is a method of cleaning a duct in which a rod-like member is inserted into the duct 200 and the duct 200 is cleaned. The cleaning method includes the step of inserting the rod-like member from the downstream pipe 230.

In this example, the cleaning tool 70 is used as the rod-like member. Cleaning tool 70 is a wire tool that can be inserted into pipe 200. In this example, the cleaning tool 70 is constituted by a rod-shaped member 71 provided with a brush 72. Specific examples of the rod-shaped member 71 include single or twisted wires. The wire includes a metal wire, needless to say, a synthetic resin wire. The brush 72 can be the above-described closing member 61.

According to the present embodiment, for example, when cleaning tool 70A having a straight line shape is used as cleaning tool 70 inserted from downstream duct 230, cleaning tool 70A can be easily inserted into 1 st upstream duct 210, which is parallel to downstream duct 230, of 1 st

upstream duct

210 and 2 nd upstream duct 220. Further, when the curling-habit cleaning tool 70B is used as the cleaning tool 70 inserted from the downstream pipe 230, the cleaning tool 70B is easily inserted into the 2 nd upstream pipe 220, which is not parallel to the downstream pipe 230, of the 1 st upstream pipe 210 and the 2 nd upstream pipe 220. Therefore, according to the cleaning method of the pipe 200 including the pipe joint 20, a desired upstream pipe into which the cleaning tool 70 is inserted can be easily selected from the 1 st upstream pipe 210 and the 2 nd upstream pipe 220 without visually checking the 1 st upstream pipe 210 and the 2 nd upstream pipe 220. Thus, according to the cleaning method of the pipe 200, a desired upstream pipe for inserting a cleaning tool or the like can be easily selected from two upstream pipes which join 1 downstream pipe without visual observation.

In the method of cleaning the pipe 200 including the pipe joint 20, at least one of the linear cleaning member 70A and the cleaning member 70B having a curling habit can be used as the cleaning member 70. In this case, when the cleaning tool 70 is to be inserted into the 1 st upstream pipe 210, if the linear cleaning member 70A is used as the cleaning tool, the desired 1 st upstream pipe 210 can be selected more easily. In addition, when the cleaning tool 70 is to be inserted into the 2 nd upstream pipe 220, if a cleaning member 70B having a curling habit is used as the cleaning tool 70, a desired 2 nd upstream pipe 220 can be more easily selected. Thus, in this case, a desired upstream pipe can be selected more easily.

Further, if any of the 1 st upstream duct 210 and the 2 nd upstream duct 220 of the duct 200 is the exhaust-side breather pipe 160 of the drain pipe structure C described above, the outflow pipe 130 can be cleaned by inserting the rod-shaped member 50 provided with the blocking member 51 through the insertion opening 230 provided in the downstream duct 230.

[ method of cleaning Drain pipe Using pipe 200 ]

As a method of cleaning the duct 200, there is a method of cleaning the drain pipe for cleaning the outflow pipe 130 of the drain pipe structure C. In this case, the snorkel 2 may be provided in either one of the 1 st upstream pipe 210 and the 2 nd upstream pipe 220. Thus, the rod-like member 50 provided with the closing member 51 is inserted from the passage 230a of the downstream pipe 230 through the pipe joint 20 into the passage 4 of the breather pipe 2, whereby the outlet portion a2 leading to the muffler 1 can be closed by the closing member 51.

Fig. 27 is a plan view showing an example of a piping structure laid in an apartment house such as an apartment.

In fig. 27, reference numeral W is an outer wall that separates the exclusive portion and the common portion. Reference numerals DP1 to DP4 denote drain pipes. In this example, the drain DP1 is a drain of a kitchen system. Furthermore, the drain pipe DP2 is a drain pipe of the washing system. Further, the drain pipe DP3 is a drain pipe of the washing system. Also, the drain pipe DP4 is a drain pipe of the bathroom system. In this example, the drain pipe DP4 is the same drain pipe as the drain pipe 130 connected to the reserve tank 10 or a drain pipe connected to the drain pipe 130.

In the example of fig. 27, a breather pipe of an exhaust system, which is formed of a pipe 200, is included. In this example, the 1 st upstream pipe 210 is a snorkel of a bathroom system, and the 2 nd upstream pipe 220 is a snorkel of a washing room system. Each system of fig. 27 is provided with an insertion port into which a cleaning tool or the like is inserted. Reference numeral 240 denotes an insertion port of the exhaust system provided in the duct 200.

The drain pipe structure C described above is a drain pipe structure of a bathroom system.

The method of cleaning the outflow pipe 130 connecting the pipe 200 to the snorkel 2 as described above includes the steps of: the outlet portion a2 of the muffler 1 formed in the breather pipe 2 is closed by the closing member 51 by inserting the rod-like member 50 provided with the closing member 51 from the passage of the downstream pipe 230 through the pipe joint 20 into the passage 4 of the breather pipe 2; and flowing the cleaning liquid to the passage of the outflow pipe 130 after closing the outlet portion a 2.

According to the above cleaning method, in the opening closing step, the rod-like member 50 is inserted into the insertion port 240 formed in the duct 200. In this case, if a linear rod-shaped member is used as the rod-shaped member 50, the 1 st upstream pipe 210 can be selected by the pipe joint 20 and the rod-shaped member 50 can be inserted into the passage of the breather pipe 2. That is, since the 1 st upstream duct 210 is oriented with respect to the downstream duct 230 so as to point in the same direction as the downstream duct 230, the work of closing the outlet portion a2 leading to the connecting duct portion for cleaning the outflow pipe 130 can be easily performed. This allows the outlet portion a2 of the muffler 1 formed in the breather pipe 2 of the muffler unit 101 to be closed by the closing member 51 provided in the rod-like member 50. As a result, the passage 4 of the ventilation path 2 can be blocked from the passage of the gravity pipe 130, as described above. After the outlet portion a2 is closed, in the cleaning liquid flowing step, the high-pressure cleaning hose 60 provided with the high-pressure cleaning nozzle 61 is inserted from the insertion port 250 formed in the drain pipe DP4 of the bathroom system, and the cleaning liquid is flowed into the passage of the outflow pipe 130. This allows the passage of the outflow pipe 130 to be cleaned, thereby cleaning the outflow pipe 130.

As described above, according to the method of cleaning the outflow pipe 130 connecting the pipe 200 to the breather pipe 2, the cleaning liquid from the outflow pipe 130 is prevented from flowing into the breather pipe 2 by the closing member 51. Therefore, according to the above-described method of cleaning the outflow pipe 130, the outflow pipe 130 can be cleaned without causing the cleaning liquid to flow into the breather pipe 2.

In the cleaning method of the outflow pipe 130 connecting the pipe 200 to the snorkel 2, the rod member 50 can be inserted into the 2 nd upstream pipe 220 by using the rod member 50 having a bending habit as the rod member 50. Here, the "bending habit" refers to a property of remaining bending deformation when the rod-shaped member is stored in a wound state. However, the "rod-shaped member having a bending habit" herein includes a rod-shaped member having a bending shape previously provided.

[ drainage System to which the present invention can be applied ]

Fig. 46 is a schematic system diagram showing an example of a drainage system to which the present invention can be applied, in a partial sectional view. In fig. 46, reference numeral 100 denotes an example of a drain system of a storage tank to which an embodiment of the present invention can be applied. In this example, the drain system 100 is a siphon drain system. The siphon drainage system is a drainage system using the principle of siphon. According to the siphon drainage system, when drainage is performed from the water using equipment, the drainage can be promoted by the siphon force generated in the siphon drainage pipe. The siphon drainage system is used, for example, as a drainage system of a collective housing in which 1 building is divided into a plurality of floors.

In this example, drain system 100 includes water-using appliance EW, appliance drain 120, reservoir 10, and siphon drain 130.

Water utility EW is deployed at each floor of the building. Examples of the water-using equipment EW include a bathtub (e.g., a bathroom), a wash stand, and a sink. In this example, the water service equipment EW is a bathtub.

The appliance drain pipe 120 connects the water appliance EW and the storage tank 10. In this example, the appliance drain pipe 120 is disposed in the underfloor space S. In this example, the underfloor space S is a space formed between a floor member FM and a floor panel FS of a building. Further, in this example, the appliance drain pipe 120 is constituted by an upstream side portion 120a extending in the longitudinal direction and a downstream side portion 120b extending in the transverse direction. The upstream portion 120a is connected to the water consuming appliance EW. The downstream side portion 120b is connected to the upstream side portion 120 a. In this example, the downstream portion 120b is inclined downward from the upstream portion 120a toward the downstream. The downstream side portion 120b is connected to the reserve tank 10. In this example, a drain trap 121 is present in the middle of the downstream portion 120 b.

A siphon drain 130 connects the reservoir 10 and the riser VP. The vertical pipe VP is a drain pipe that penetrates each floor of the building in the vertical direction. In this example, the siphon drain 130 is composed of a horizontal pipe 130a disposed in the underfloor space S and a vertical pipe 130b penetrating the floor FS and hanging downward. The cross tube 130a is connected to the reserve tank 10. In the present example, the cross tube 130a extends in the transverse direction in a substantially horizontal, non-inclined manner. In detail, the floor slab FS is laid along the floor slab FS provided with the layer of the water using equipment EW in a substantially horizontal and non-inclined manner. Standpipe 130b is connected to cross tube 130 a. Standpipe 130b is connected to standpipe 150 by pipe joint CJ. In detail, the vertical tube 130b extends downward substantially perpendicular to the horizontal tube 130a, forming a vertical portion, creating an siphon force (e.g., negative pressure).

In the drainage system 100 of this example, first, the liquid flows out of the water utility EW due to the difference in height H1 between the outflow port of the water utility EW and the cross pipe 130a of the siphon drain 130. The liquid (for example, water) flowing out of the water-using tool EW flows into the storage tank 10 from the tool drain pipe 120 by the self-weight (drop-pressure) of the liquid. The reserve tank 10 accumulates a part of the liquid inside and discharges the remaining liquid to the siphon drain 130.

In this example, the siphon drain 130 forms a siphon drain path that generates a suction force caused by a siphon force. In the siphon drainage path, the siphon suction force generated in the siphon drainage pipe 130 can be used to facilitate the drainage of liquid from the siphon drainage pipe 130.

In the siphon drainage path of this example, the appliance drain pipe 120 and the horizontal pipe 130a of the siphon drain pipe 130 are filled with water by the drop push-in pressure of the drain water from the water-using appliance EW due to the height difference H1 between the outflow port of the water-using appliance EW and the horizontal pipe 130a of the siphon drain pipe 130, and the drain water reaching the vertical pipe 130b (the hanging length H2) of the siphon drain pipe 130 starts to drop in the vertical pipe 130b by the filling of the horizontal pipe 130a of the siphon drain pipe 130, so that the horizontal pipe 130a of the siphon drain pipe 130 is in a full water state, thereby generating a siphon action. This siphon action is used as a drainage power, and drainage is performed from the water using equipment EW by a high-speed flow generated in the siphon drainage path, so that the drainage is smoothly and quickly discharged into the pipe joint CJ.

In this example, since the siphon drainage system is adopted as the drainage system 100, the inside of the drainage pipe is filled with full water, and thus full-flow drainage is performed. When the siphon drainage system is adopted as the drainage system 100, the drainage of the liquid becomes full-flow drainage, so that the solid matter can be prevented from adhering to the pipe, and the small-diameter pipe can be used. In this example, since the siphon drain system is adopted as the drain system 100, the drain pipe can be arranged without inclination. When the siphon drainage system is adopted as the drainage system 100 in this way, the drainage pipe can be arranged without inclination, and the height of the space under the floor where the drainage pipe is arranged can be reduced. In this example, since the siphon drainage system is used as the drainage system 100, the extending distance from the drainage source (for example, various water utilities EW) to the vertical pipe VP (for example, the horizontal length L from the outlet of the water utilities EW to the vertical pipe 130b of the siphon drainage pipe 130) can be increased (see fig. 46), and the degree of freedom in layout of the living room can be further improved.

In the drain system 100 using the siphon drain system, it is assumed that a large amount of liquid is discharged at a time from the water-using tool EW, and the storage tank 10 is provided between the tool drain 120 and the siphon drain 130. The storage tank 10 can temporarily store a large amount of water discharged at a time from the water consuming device EW until the start of promotion of drainage (generation of siphon force).

[ exemplary storage tank ]

Fig. 28 is a perspective view showing the inflow side of the exemplary reserve tank 10A from above. Fig. 29 is a perspective view showing the outflow side of the reserve tank 10A of fig. 28 from above. The storage tank 10A has an inlet a11 through which the liquid flows in and an outlet a12 through which the liquid flows out, and can store the liquid flowing in through the inlet a 11.

Fig. 30 is a front view showing the reservoir tank 10A from the inflow side. Fig. 31 is a rear view showing the reservoir tank 10A from the outflow side. As shown in fig. 31, the reservoir tank 10A includes a bottom wall 11, a peripheral wall 12 standing from the bottom surface, and two partition walls 13 standing from the bottom surface. In the present embodiment, the reserve tank 10A includes a ceiling wall 14. The top wall 14 is connected to the upper end of the peripheral wall 12. Thus, a space defined by the bottom wall 11, the peripheral wall 12, and the top wall 14 is formed inside the reserve tank 10A. In the reservoir tank 10A, a vent H12 is formed in the peripheral wall 12. The vent H12 opens the internal space of the reservoir 10A to the outside. This prevents the interior of the reserve tank 10A from becoming negative pressure.

Fig. 32 is a plan view showing the reserve tank 10A from above. Fig. 33 is a bottom view of the reservoir tank 10A from below. As shown in fig. 33, in the reservoir tank 10A, the peripheral wall 12 includes an inlet portion 12a in which an inlet a11 is formed and an outlet portion 12b opposed to the inlet portion 12a and in which an outlet a12 is formed. In this example, the peripheral wall 12 includes an inflow port part 12a, an outflow port part 12b, an inflow side adjacent part 12c adjacent to the inflow port part 12a, an outflow side adjacent part 12d adjacent to the outflow port part 12b, and a side surface part 12 e. Also, in this example, the peripheral wall 12 includes an inflow side corner portion 12f connecting the inflow side adjacent portion 12c and the side surface portion 12e, and an outflow side corner portion 12g connecting the side surface portion 12e and the outflow side adjacent portion 12 d.

As shown in fig. 33, in the reservoir tank 10A, the bottom wall 11 is defined by the peripheral wall 12. As shown in fig. 32, the top wall 14 is also divided by the peripheral wall 12, similarly to the bottom wall 11. In this example, the top wall 14 has two openings a 13. The opening a13 opens the internal space of the reservoir tank 10A to the outside. Further, in this example, the peripheral wall 12 has a recessed portion 12h on the top wall 14 side at each position of the inflow-side corner portion 12f and the outflow-side corner portion 12 g.

Fig. 34 is a sectional view a-a of fig. 30. Fig. 34 is a maximum cross section of the reserve tank 10A. Fig. 35 is a sectional view B-B of fig. 30. Fig. 35 is a cross section through the center Oa of the inflow port a 11. Fig. 36 is a cross-sectional view C-C of fig. 31. Fig. 36 is a cross section through the center Ob of the outflow port a 12. As shown in fig. 34 and the like, the reservoir tank 10A includes a liquid passage region R1 extending between the inlet port a11 and the outlet port a12, and liquid retention regions R2 disposed at respective positions on both sides across the liquid passage region R1. In the storage tank 10A, the liquid passage region R1 connects the inlet a11 and the outlet a12, and guides the liquid flowing from the inlet a11 to the outlet a 12. The liquid passage region R1 may be curved or extend in a zigzag shape in plan view. In this example, as shown in fig. 34 to 36, the liquid passing region R1 extends linearly. Thus, the liquid passage region R1 is a path in which the liquid passage path connecting the inlet a11 and the outlet a12 is shortest.

On the other hand, as shown in fig. 34 and the like, the two liquid retention regions R2 are disposed at respective positions on both sides of the liquid passage region R1 and at positions adjacent to the liquid passage region R1. The two liquid retention regions R2 can retain the liquid that has flowed in from the inlet a 11.

As shown in fig. 34 and the like, in the reservoir tank 10A, the inlet portion 12a of the peripheral wall 12 is recessed toward the outlet side with respect to the inlet-side adjacent portion 12c adjacent to the inlet portion 12 a. In this example, as shown in fig. 34 and the like, the inflow-side adjacent portion 12c of the peripheral wall 12 is connected to the inflow port portion 12a via two inflow-

side corner portions

12j and 12 i.

In the reservoir tank 10A, the outflow port portion 12b of the peripheral wall 12 protrudes toward the outflow side with respect to the outflow-side adjacent portion 12 d. In this example, as shown in fig. 34 and the like, the outflow side adjacent portion 12d of the peripheral wall 12 is connected to the outflow port portion 12 b.

Fig. 37 is a right side view showing the right side surface of the reservoir tank 10A. Fig. 38 is a left side view showing the left side surface of the reservoir tank 10A. As shown in fig. 37 and the like, in the reservoir tank 10A, the inlet a11 is located below the portion of the peripheral wall 12 other than the inlet portion 12a and the outlet portion 12b of the peripheral wall 12. Similarly to the inlet a11, the outlet a12 is also located below the inlet portion 12a and the outlet portion 12b of the peripheral wall 12.

Fig. 39 is a cross-sectional view taken along line D-D of fig. 32. Fig. 39 is a cross section of the reserve tank 10A divided into two. Fig. 39 shows the internal structure of the liquid passage region R1 and the liquid retention region R2 in the storage tank 10A. Fig. 40 is a cross-sectional view E-E of fig. 32. Fig. 40 shows the internal structure of the liquid retention region R2 in the storage tank 10A. As shown in fig. 39, in the reservoir tank 10A, the inlet a11 is constituted by an inlet path P1 formed in the inlet portion 12a of the peripheral wall 12. The outlet a12 is constituted by an outlet path P2 formed in the outlet portion 12b of the peripheral wall 12. In the storage tank 10A, the liquid passage region R1 is constituted by the inner surface 12fa of the inlet portion 12a of the peripheral wall 12, the inner surface (bottom surface) 11fa of the lower portion 11a in the bottom wall 11, and the inner surface 12fb of the outlet portion 12b of the peripheral wall 12. In the reservoir tank 10A, as shown in fig. 39, the bottom surface F1 of the liquid passage region R1 is formed of a flat surface. In this example, the bottom surface F1 of the liquid passing region R1 is constituted by the lowermost end (the lowermost extending end of the inlet port portion 12a extending in the liquid flow direction) 12fa1 of the inner surface 12fa of the inlet port portion 12a of the peripheral wall 12, the lowermost end (the lowermost extending end of the lower portion 11a extending in the liquid flow direction) 12fa1 of the inner surface 11fa of the lower portion 11a of the bottom wall 11, and the lowermost end (the lowermost extending end of the outlet port portion 12b extending in the liquid flow direction) 12fb1 of the inner surface 12fb of the outlet port portion 12b of the peripheral wall 12.

In fig. 39, reference numeral 12fP1 denotes the lowermost end of the inflow path P1 (the lowermost extending end of the inflow path P1 extending in the liquid flow direction). Further, reference numeral 12fP2 is the lowermost end of the outflow path P2 formed in the outflow port portion 12b (the lowermost extended end of the outflow path P2 extending in the liquid flow direction). As shown in fig. 39 and the like, in the storage tank 10A, the lowermost end (bottom surface) 11fa1 of the lower portion 11a of the bottom wall 11 is inclined downward toward the downstream, and the outlet a12 is provided at a position lower than the inlet a 11.

On the other hand, as shown in fig. 34 and the like, the two liquid retention regions R2 are divided by a liquid passing region R1 and a portion of the peripheral wall 12 other than the inlet port portion 12a and the outlet port portion 12b of the peripheral wall 12, respectively, in a plan view. In detail, in a plan view, the two liquid retention regions R2 are respectively defined by an inner surface 12fi of the inflow side corner portion 12i, an inner surface 12fj of the inflow side corner portion 12j, an inner surface 12fc of the inflow side adjacent portion 12c, an inner surface 12ff of the inflow side corner portion 12f, an inner surface 12fe of the side surface portion 12e, an inner surface 12fg of the outflow side corner portion 12g, an inner surface 12fd of the outflow side adjacent portion 12d, and a liquid passing region R1. As shown in fig. 41 and the like, the two liquid retention regions R2 are respectively constituted by an inner surface (bottom surface) 11fb of the upper portion 11b in the bottom wall 11 and an inner surface (top surface) 14f of the top wall 14. In the reservoir tank 10A, as shown in fig. 40, the bottom surface F2 of the liquid retention region R2 is formed of a flat surface. In the present embodiment, the bottom surface F2 of the liquid retention region R2 is constituted by the inner surface 11fb of the upper portion 11b of the bottom wall 11.

Fig. 41 is a perspective view showing a section F-F of fig. 32 from the inflow side. The F-F section is a plane section including the central axes of the two opening portions a13 of the top wall 14. As shown in fig. 41, the groove portions G are arranged in the liquid passage region R1. The groove G is disposed between the inlet a11 and the outlet a 12. As shown in fig. 41 and the like, in the reservoir tank 10A, part of the tank portion G is formed by the inner surface 11fa of the lower portion 11a of the bottom wall 11. In the reserve tank 10A, a lower portion 11a of the bottom wall 11 is recessed with respect to an upper portion 11b of the bottom wall 11. In this example, the inner surface 11fa of the lower portion 11a of the bottom wall 11 is constituted by a deepest face 11fa1 and two side faces 11fa 2. The deepest face 11fa1 is the deepest face (the lowermost end) in the bottom wall 11. The deepest face 11fa1 is connected to the inner face 11fb of the upper portion 11b of the bottom wall 11 via a side face 11fa 2. The deepest face 11fa1 is connected to the side face 11fa2 by a curved face formed by a curve when viewed in the extending direction of the liquid passing region R1. The side face 11fa2 is connected to the inner face 11fb of the upper portion 11b by a curved surface formed by a curve when viewed in the extending direction of the liquid passing region R1.

Further, in the reserve tank 10A, part of the groove portion G is formed by the inner surface 12fb of the outlet port portion 12b of the peripheral wall 12. As shown in fig. 31 and the like, in the reserve tank 10A, the outlet portion 12b of the peripheral wall 12 extends downward such that the outlet a12 is positioned below the outlet-side adjacent portion 12 d. As shown in fig. 41, in this example, the inner surface 12fb of the outlet port portion 12b of the peripheral wall 12 includes a deepest surface 12fb1 and two side surfaces 12fb 2. The deepest surface 12fb1 is connected to the side surface 12fb2 by a curved surface formed by a curve when viewed in the extending direction of the liquid passing region R1. The side face 12fb2 is flush with the side face 11fa2 of the lower portion 11a of the bottom wall 11. The deepest surface 12fb1 is the deepest surface (the lowermost end) of the inner surface 12fb of the outlet port portion 12b of the peripheral wall 12. The deepest face 12fb1 and the deepest face 11fa1 of the lower portion 11a of the bottom wall 11 constitute the same plane. Further, the deepest face 12fb1 is connected to the inner face 13f1 of the partition wall 13 via a side face 12fb 2. The side surface 12fb2 is flush with the inner surface 13f1 of the partition wall 13.

As shown in fig. 35 and the like, in the storage tank 10A, the groove G is partially formed by the inner surface 12fa of the inlet portion 12a of the peripheral wall 12. As shown in fig. 30 and the like, in the reservoir tank 10A, the inlet portion 12a of the peripheral wall 12 extends downward such that the inlet a11 is positioned below the inlet-side adjacent portion 12 c. As shown in fig. 35, in this example, the inner surface 12fa of the inlet portion 12a of the peripheral wall 12 is constituted by a deepest surface 12fa1 and two side surfaces 11fa 2. The deepest face 12fa1 is connected to the side face 12fa2 by a curved face formed by a curve when viewed in the extending direction of the liquid passing region R1. The side face 12fa2 is coplanar with the side face 11fa2 of the lower portion 11a of the bottom wall 11. As shown in fig. 39 and the like, the deepest surface 12fa1 is the deepest surface (the lowermost end) of the inner surface 12fa of the inlet port portion 12a of the peripheral wall 12. The deepest face 12fa1 and the deepest face 11fa1 of the lower portion 11a of the bottom wall 11 constitute the same plane. Further, as shown in fig. 35 and the like, the deepest face 12fa1 is connected to the inner face 12fi of the inflow side corner portion 12i via the side face 12fa 2.

As shown in fig. 36 and the like, the two partition walls 13 extend toward the outflow port a 12. In the reserve tank 10A, the outflow port a12 is secured and extends toward the outflow port a 12. Here, "ensuring the outflow port a 12" means "not closing the opening of the outflow port a 12".

As shown in fig. 39, in the storage tank 10A, the partition wall 13 has a height H13 at which the liquid can overflow from the partition wall 13. In this example, the height H13 of the partition wall 13 is a height from the bottom surface F1 of the liquid passing region R1. Thus, when the head of the liquid passing through the liquid passing region R1 becomes a certain level or more, the liquid can flow into the liquid retention region R2.

As shown in fig. 39 and the like, in the reserve tank 10A, the height H13 of the partition wall 13 increases as it goes toward the outlet a 12. As shown in fig. 39 and the like, in this example, the top surface 13f2 of the partition wall 13 is a curved surface formed by a curved line whose sectional shape in side view is convex toward the outflow side. As shown in fig. 39, in this example, the curve of the top surface 13f2 of the partition wall 13 is constituted by a radius of curvature R13.

In the reservoir tank 10A, the partition wall 13 is formed as a part of the outlet portion 12b of the peripheral wall 12. The partition wall 13 rises from a position adjacent to the groove G. Fig. 42 is a perspective view showing a section G-G of fig. 32 from the inflow side. The G-G section is a section of a plane including the boundary of the peripheral wall 12 and the bottom wall 11. As shown in fig. 42 and the like, in the reserve tank 10A, the inner surface 13f1 of the partition wall 13 is connected to the side surface 12fb2 in the inner surface 12fb of the outlet port portion 12b of the peripheral wall 12, and constitutes the same plane as the side surface 12fb 2. Further, in the reserve tank 10A, the inner surface 12fd of the outflow-side adjacent portion 12d of the peripheral wall 12 adjacent to the outflow port portion 12b of the peripheral wall 12 is continuous with the top surface 13f2 of the partition wall 13, and forms the same plane as the top surface 13f2 of the partition wall 13. Here, "same surface" means "continuous surface that is smoothly connected to each other, and includes any one of" flat surface "and" curved surface ".

Fig. 43 is a sectional view H-H of fig. 32. As shown in fig. 43, in the reserve tank 10A, the end edge portion 13e of the top surface 13f2 of the partition wall 13 is a curved surface that is convex toward the inside of the reserve tank 10A.

Further, as shown in fig. 40, in the reservoir tank 10A, the inner surface 12fd of the outflow side adjacent portion 12d of the peripheral wall 12 is a curved surface constituted by a curve whose sectional shape in side view is convex toward the outflow side. As shown in fig. 40, in the present embodiment, the curve on the bottom wall 11 side of the inner surface 12fd of the outflow-side adjacent portion 12d is formed of a large radius of curvature Rd 12. In this example, the radius of curvature Rd12 is the same as the radius of curvature R13 of the curve forming the top surface 13f2 of the partition wall 13. On the other hand, the top wall 14 side curve is formed of a curvature radius Rd14 smaller than that of the bottom wall 11 side curve.

The present inventors have found, based on the results of extensive experiments and studies, that in a reservoir used in a siphon drainage system, when the head of liquid in the vicinity of the outlet of the reservoir is rapidly increased, a large amount of liquid can be rapidly and smoothly discharged, and the time until siphon force is generated can be shortened. The reservoir tank 10A of the present embodiment is made by focusing attention on the fact that a large amount of liquid can be quickly and smoothly discharged when the water head of the liquid in the vicinity of the outlet port a12 is quickly increased.

As shown in fig. 39 and the like, the storage tank 10A has an inlet a11 through which the liquid flows in and an outlet a12 through which the liquid flows out, and is capable of storing the liquid flowing in from the inlet a11 therein. The storage tank 10A includes a peripheral wall 12 standing upright on the bottom surface and two partition walls 13 standing upright on the bottom surface, and the peripheral wall 12 includes an inlet portion 12a in which an inlet a11 is formed and an outlet portion 12b opposed to the inlet portion 12a and in which an outlet a12 is formed. The two partition walls 13 extend toward the outflow opening a 12.

According to the reserve tank 10A, by providing the partition wall 13, the head of the liquid near the outlet a12 can be rapidly increased while ensuring the flow of the liquid to the outlet a12 as indicated by an arrow D1. Even when the amount of the liquid (drain) flowing in from the inlet a11 is small, the head of the liquid in the vicinity of the outlet a12 can be quickly raised by providing the partition wall 13 in the storage tank 10A, and as a result, siphon actuation is likely to occur. Even when a large amount of liquid flows in from the inlet a11, for example, a small amount of liquid reaches the vicinity of the outlet a12 in the first stage. Even if the amount of liquid in the vicinity of the outlet a12 is small, the head of liquid in the vicinity of the outlet a12 can be rapidly increased by providing the partition wall 13 in the storage tank 10A, and as a result, siphon actuation is likely to occur. Therefore, according to the storage tank 10A of the present embodiment, a large amount of liquid can be quickly and smoothly discharged. In particular, if the storage tank 10A is used for a siphon drainage system like the storage tank 10A, even when a large amount of liquid is discharged, the time until the siphon force is generated can be shortened.

As shown in fig. 39, in the storage tank 10A, the partition wall 13 has a height H13 at which the liquid can overflow from the partition wall 13. In this case, when the head of the liquid in the vicinity of the outflow port a12 becomes equal to or higher than a certain level, the liquid in the vicinity of the outflow port a12 can escape from the partition wall 13 as shown by an arrow D2 in fig. 42 and the like. Therefore, according to the storage tank 10A, the flow of the liquid is less likely to be obstructed near the outflow port a2, and more rapid and smooth drainage can be performed.

As shown in fig. 39, in the reserve tank 10A, the height H13 of the partition wall 13 increases as it goes toward the outlet a 12. In this case, the amount of liquid escaping from the partition wall 13 can be increased as the liquid head near the outlet a12 is increased as the liquid leaves the outlet a 12. Therefore, according to the reserve tank 10A, the time until the siphon force is generated can be shortened and the drainage can be smoothly balanced (both of them can be established).

As shown in fig. 39, in the storage tank 10A, the outlet a12 is provided at a position lower than the inlet a 11. In this case, more rapid and smooth drainage can be performed. Therefore, according to the reservoir tank 10A, the time until the siphon force is generated can be further shortened.

As shown in fig. 42 and the like, in the reserve tank 10A, the partition wall 13 is formed as a part of the outlet portion 12b of the peripheral wall 12, and the inner surface 12fd of the outlet side adjacent portion 12d of the peripheral wall 12 adjacent to the outlet portion 12b of the peripheral wall 12 is continuous with the top surface 13f2 of the partition wall 13 and is flush with the top surface 13f2 of the partition wall 13. In this case, as shown by an arrow D2, the liquid escaping from the partition wall 13 can be made to further escape along the inner surface 12fd of the outflow side adjacent portion 12D of the peripheral wall 12. Therefore, according to the storage tank 10A, the flow of the liquid is less likely to be obstructed near the outflow port a12, and drainage can be performed more quickly and smoothly.

Further, as shown in fig. 43, in the reservoir tank 10A, the end edge portion 13e of the top surface 13f2 of the partition wall 13 is a curved surface that is convex toward the inside of the reservoir tank 10A. In this case, as indicated by an arrow D2, the liquid in the vicinity of the outlet a12 can be efficiently and smoothly discharged from the partition wall 13 along the inner surface 12fd of the outflow-side adjacent portion 12D of the peripheral wall 12. Therefore, according to the reserve tank 10A, rapid and smooth drainage can be efficiently performed.

Further, as shown in fig. 40 and the like, in the reservoir tank 10A, the inner surface 12fd of the outflow side adjacent portion 12d of the peripheral wall 12 is a curved surface constituted by a curve whose sectional shape in side view is convex toward the outflow side. In this case, as shown by an arrow D3, the liquid escaping from the partition wall 13 can be caused to further escape along the inner surface 12fd of the outflow-side adjacent portion 12D of the peripheral wall 12 while generating convection (circulation) in the up-down direction (longitudinal direction). Therefore, according to the reserve tank 10A, drainage can be performed more quickly and smoothly.

As shown in fig. 34 and the like in particular, the reservoir tank 10A includes a liquid passage region R1 extending between the inlet port a11 and the outlet port a12, and liquid retention regions R2 disposed at respective positions on both sides across the liquid passage region R1. In this case, as shown by arrows D1 and D2, the remaining portion of the liquid can be retained in the liquid retention region R2 while flowing the liquid to the liquid passing region R1. Therefore, according to the reservoir tank 10A, it is possible to store more liquid in the liquid retention region R2 while suppressing the increase in the length of the liquid passage region R1 in the extension direction. Therefore, according to the storage tank 10A, the flow of the liquid is less likely to be obstructed near the outflow port a12, and more liquid can be discharged quickly and smoothly continuously at a constant amount. Further, in this case, the liquid flowing from the liquid passing region R1 can be convected (circulated) between the liquid passing region R1 and the liquid retention region R2 as shown by the arrow D4. Therefore, according to the reservoir tank 10A, more liquid can be discharged quickly and smoothly while suppressing the increase in the length of the liquid passage region R1 in the extending direction. In this case, the liquid flowing through the liquid passage region R1 flows counter-currently between the liquid passage region R1 and the liquid retention region R2, and therefore, the contaminants are less likely to adhere to the inside of the storage tank 10A. This can reduce the number of operations required to clean the storage tank 10A.

Further, according to the reservoir tank 10A, since the liquid retention regions R2 are disposed at respective positions on both sides of the liquid passage region R1, in order to secure the volume of the liquid retention region R2, for example, the dimension (area) in the direction in which the liquid retention region R2 extends may be increased, and it is possible to eliminate the need to increase the height of the liquid retention region R2 and, further, the height of the reservoir tank 10A. Therefore, if the storage tank 10A is provided on the floor FS or the like such that the direction in which the liquid retention regions R2 extend on both sides across the liquid passage region R1 is set to the horizontal direction and the vertical direction in which the peripheral wall 12 stands is set to the vertical direction, as in the storage tank 10A, it is possible to quickly and smoothly discharge a large amount of liquid without securing a large height of the underfloor space S. Here, the "height of the reserve tank 10A" is a height (dimension) of the reserve tank 10A in the vertical direction. In other words, the height (dimension) of the peripheral wall 12 of the storage tank 10A in the vertical direction.

From the above-described viewpoint, more specifically, for example, in the storage tank 10A, the height of the storage tank 10A can be set smaller than the width of the storage tank 10A, the height of the storage tank 10A is preferably 1/2 or less of the width of the storage tank 10A, and the height of the storage tank 10A is more preferably 1/3 or less of the width of the storage tank 10A. Here, the "width of the storage tank 10A" means the maximum width between the two peripheral walls 12 in the peripheral walls 12 of the storage tank 10A opposed to each other in the direction orthogonal to the height direction of the storage tank 10A and the extending direction of the liquid passing region R1. That is, referring to fig. 34, the width (dimension) between the outer surfaces of the two peripheral walls (side walls) 12e of the reserve tank 1A arranged in the vertical direction of the drawing is shown.

As shown in fig. 34 and the like, in the reservoir tank 10A, the inlet portion 12a of the peripheral wall 12 is recessed toward the outlet side with respect to the inlet-side adjacent portion 12c of the peripheral wall 12 adjacent to the inlet portion 12 a. In this case, the liquid flowing in the reservoir tank 10A is easily returned in the liquid outflow direction. Therefore, water can be drained more quickly and smoothly. In particular, in the storage tank 10A, since the liquid retention region R2 is disposed at a position adjacent to the liquid passage region R1, the liquid flowing from the liquid passage region R1 is easily returned to the liquid passage region R1. That is, in the storage tank 10A, convection can be efficiently performed between the liquid passage region R1 and the liquid retention region R2. Therefore, according to the reservoir tank 10A, a large amount of liquid can be discharged more quickly and smoothly through the liquid passage region R1. Further, in the storage tank 10A, dirt is less likely to adhere to the inside of the storage tank 10A. This can further reduce the number of operations required to clean the storage tank 10A.

As shown in fig. 42, the partition wall 13 rises from a position adjacent to the groove G. In the reservoir tank 10A, the tank portion G is disposed in the liquid passage region R1. In this case, even a small amount of liquid can be collected in the groove G more quickly. Therefore, more rapid and smooth drainage can be performed. In the storage tank 10A, the partition wall 13 rises from a position adjacent to the groove portion G disposed in the liquid passage region R1. In this case, even a small amount of liquid can be collected in the liquid passing region R1 quickly. Therefore, according to the reservoir tank 10A, a large amount of liquid can be discharged more quickly and smoothly through the liquid passage region R1. In particular, in this case, since the partition wall 13 rises from a position adjacent to the groove portion G disposed in the liquid passage region R1, the head of the liquid in the vicinity of the outlet a12 can be increased more quickly. Therefore, according to the reservoir tank 10A, a large amount of liquid can be discharged more quickly and smoothly through the liquid passage region R1.

Further, as shown in fig. 34 and the like, in the reserve tank 10A, a portion of the inner surface 12f of the peripheral wall 12, which forms a corner portion inside the reserve tank 10A in a plan view, is a curved surface whose outline shape in the plan view is formed of a curved line. In the reservoir tank 10A, for example, the inner surface 12fi of the inflow side corner portion 12i, the inner surface 12fj of the inflow side corner portion 12j, and the inner surfaces 12ff of the inflow side corner portion 12f and the inner surface 12fg of the outflow side corner portion 12g are curved surfaces whose outline shapes in plan view are formed by curves, respectively. In this case, the liquid flowing from the liquid passing region R1 can be more efficiently convected between the liquid passing region R1 and the liquid retention region R2. Therefore, according to the storage tank 10A, a large amount of liquid can be discharged more smoothly, and the number of operations required for cleaning the storage tank 10A can be further reduced.

Further, the present inventors have found, based on the results of extensive experiments and studies, that in a storage tank used in a siphon drainage system, when liquid is collected in the vicinity of an outlet port of the storage tank, a large amount of liquid can be discharged quickly and smoothly, and the time until siphon force is generated can be shortened. The reservoir tank 10A according to the present embodiment is made with a view to collecting the liquid in the vicinity of the outflow port a12 and allowing a large amount of liquid to flow out quickly and smoothly.

In the reserve tank 10A, the outflow port portion 12b of the peripheral wall 12 protrudes toward the outflow side with respect to the outflow side adjacent portion 12d of the peripheral wall 12 adjacent to the outflow port portion 12b of the peripheral wall 12. In this case, the liquid is easily collected in the vicinity of the outlet a 12. Therefore, according to the storage tank 10A, a large amount of liquid can be quickly and smoothly discharged. In particular, if the storage tank 10A is used for a siphon drainage system like the storage tank 10A, even when a large amount of liquid is discharged, the time until the siphon force is generated can be shortened.

Fig. 44 is a cross-sectional view I-I of fig. 32. The I-I section is a section of a plane including the upper ends of the outflow-side adjacent portions 12d of the peripheral wall 12. As shown in fig. 44, in the reserve tank 10A, the cross-sectional shape of the inner surface 12fb of the outlet port portion 12b of the peripheral wall 12 when viewed from the liquid flow direction is a racetrack shape. In this case, the liquid is easily collected in the vicinity of the outlet a 12. In the stock tank 10A, the racetrack shape is a flat shape extending in the lateral direction (horizontal direction). Exemplary racetrack shapes include a racetrack shape having a one-sided single-center circle (japanese: center Yen) with 1 center O1 disposed on one side, a one-sided two-center circle (japanese: two-centers Yen) with two centers O1 and O2 disposed on one side, and a one-sided three-center circle (japanese: three-centers Yen) with 3 centers O1, O2, and O3 disposed on one side. The racetrack shape of the one-side three-center circle includes a racetrack shape of a one-side regular three-center circle in which 3 centers O1 to O3 are aligned, a racetrack shape of a one-side sharp three-center circle in which 1 center O2 between two centers O1 and the center O3 is disposed on the outer side, and a racetrack shape of a blunt three-center circle in which 1 center O2 between two centers O1 and the center O3 is disposed on the inner side. In the present embodiment, the cross-sectional shape of the outlet a2 is similar to the racetrack shape of a one-sided acute three-center circle. In the present embodiment, two centers O1 and O2 separated by 1 center O2 are not aligned, and a — B are straight lines. In addition, the other intervals are curves.

In addition, in order to facilitate the collection of the liquid, it is preferable to form the inner surface 12fb of the outlet port portion 12b of the peripheral wall 12 in a cross-sectional shape when viewed from the liquid flow direction as a racetrack shape. On the other hand, the cross-sectional shape of the inner surface 12fb of the outlet portion 12b of the peripheral wall 12 when viewed from the liquid flow direction may be a circular shape or an elliptical shape. When the inner surface 12fb of the outlet portion 12b of the peripheral wall 12 is circular or elliptical when viewed from the liquid flow direction, a large flow rate of liquid is likely to flow. However, the cross-sectional shape of the circular shape or the elliptical shape is a cross-sectional shape that is exclusively used for a case of a large flow rate. Therefore, when a liquid is to flow continuously as in the reservoir tank 10A, the racetrack shape exemplified in fig. 45 is particularly preferable.

In particular, in the reserve tank 10A, as shown in fig. 34 and the like, the inner surface 12fb of the outlet portion 12b of the peripheral wall 12 includes a curved surface whose tip becomes thinner toward the outlet a 12. In this case, the liquid is more likely to collect near the outlet a 12.

As shown in fig. 43, in the storage tank 10A, the bottom surface F2 of the liquid retention region R2 is a flat surface which is inclined downward toward the liquid passage region R1 when viewed from the extending direction of the liquid passage region R1 and which is continuous with the bottom surface F1 of the liquid passage region R1. In this case, the liquid in the liquid retention region R2 easily flows into the liquid passage region R1 along the bottom surface F2 of the liquid retention region R2. Therefore, according to the reservoir tank 10A, a large amount of liquid can be discharged more smoothly through the liquid passage region R1. In the reservoir tank 10A, the bottom surface F2 of the liquid retention region R2 is inclined at an angle θ 11b with respect to a horizontal axis (indicated by a straight line Oy appearing when the horizontal plane is viewed from the extending direction of the liquid passing region R1 in fig. 43). The angle θ 11b can be set as appropriate according to the internal volume, size, and the like of the reserve tank 10. The angle θ 11b may be, for example, an angle of 0.5 ° to 5 °. In the case where the angle θ 11b is less than 0.5 °, the effect is small for forming the convection of the drainage. In addition, when the angle θ 11b is 5 ° or more, since the inclination is excessively large, when all the liquid does not enter the outlet a12 and water overflows, the overflowing liquid does not smoothly flow to the liquid retention region R2.

In the storage tank 10A, as shown in fig. 43, the bottom surfaces F2 of the two liquid retention areas R2 are inclined downward as they approach each other. In this case, if the lower ends of the bottom surfaces F2 of the two liquid retention regions R2 are directly connected, the liquid passage region R1 can be formed as a V-shaped groove having the directly connected portion of the two bottom surfaces F2 as the groove bottom. Alternatively, the liquid passage region R1 may be a trapezoidal V-shaped groove having a bottom surface formed by connecting the lower ends of the bottom surfaces F2 of the two liquid retention regions R2 by a flat surface. The bottom surfaces F1 of the liquid passing regions R1 are all at the same height as the bottom surfaces F2 of the two liquid retaining regions R2.

In contrast, as shown in fig. 39 and the like, in the reservoir tank 10A, the bottom surface F1 of the liquid passage region R1 is disposed at a position lower than the bottom surface F2 of the liquid retention region R2. In this case, a large amount of liquid can be collected in the liquid passage region R1. Therefore, according to the reservoir tank 10A, a large amount of liquid can be discharged more smoothly through the liquid passage region R1. In the reservoir tank 10A, the groove portion G is disposed in the liquid passage region R1. The lowermost end 12fP2 of the outlet a12 is disposed at a position lower than the bottom F2 of the liquid retention region R2.

Further, as shown in fig. 39 to 43 and the like, in the reservoir tank 10A, at least the inner surface 12f of the peripheral wall 12 in the liquid retention region R2 is a curved surface constituted by a curve of which sectional shape when viewed from the extending direction of the peripheral wall 12 is convex outward from the inside of the reservoir tank 1A. In this case, the liquid flowing through the liquid passing region R1 further escapes along the inner surface 12fd of the outflow-side adjacent portion 12d of the peripheral wall 12 while generating convection (circulation) in the up-down direction (longitudinal direction). Therefore, according to the present embodiment, convection between the liquid passing region R1 and the liquid retention region R2 can be performed more efficiently. Therefore, according to the storage tank 10A, a large amount of liquid can be discharged more smoothly, and the number of operations required for cleaning the storage tank 10A can be further reduced.

In the storage tank 10A, as shown in fig. 30 and 31, the liquid passage region R1 is arranged such that the outlet port a12 and at least a part of the inlet port a11 overlap in a straight line when viewed from the liquid flow direction (when viewed from the extending direction of the liquid passage region R1).

Referring to fig. 30, a specific example of the arrangement of the inlet a11 and the outlet a12 includes a method of combining any one of the following (1) to (3).

(1) The center Oa of the inflow port a11 and the center Ob of the outflow port 1b are aligned on the same vertical line Oz when viewed from the extending direction of the liquid passage region R1.

(2) The inner diameter of the inlet a11 (the radius ra of the inlet a 11) and the inner diameter of the outlet a12 (the radius rb of the outlet a 12) were adjusted.

(3) The interval Δ Z in the vertical direction (the direction of the vertical line Oz) between the center Oa of the inlet a11 and the center Ob of the outlet a12 is adjusted.

In the storage tank 10A, all the methods (1) to (3) are used, and the outlet a12 and at least a part of the inlet a11 are arranged so as to overlap in a straight line when viewed from the extending direction of the liquid passage region R. In particular, as shown in fig. 30, in the reservoir tank 10A, the inner diameter of the outlet a12 is set to be smaller than the inner diameter of the inlet a11 in (2). Thus, the amount of liquid flowing out of the outlet a12 is smaller than the amount of liquid flowing in from the inlet a 11. In addition, in the reserve tank 10A, as shown in fig. 30, in (3), the interval Δ Z in the vertical direction between the center Oa of the inflow port a11 and the center Ob of the outflow port a12 is adjusted so that the open inner upper end of the outflow port a12 overlaps the open inner lower end of the inflow port a 11.

[ Another exemplary storage tank ]

Fig. 45 is a perspective view showing the inflow side of another exemplary reservoir tank 10B from above. In the storage tank 10B, the peripheral wall 12 surrounds the liquid passage region R1 and the two liquid retention regions R2 disposed on both sides of the liquid passage region R1, and the external shape of the storage tank 10B is formed into a butterfly shape (H shape). In the reservoir tank 10B, the partition wall 13 is a wall different from the peripheral wall 12.

The above description is illustrative of the exemplary embodiments of the present invention, and various modifications can be made without departing from the scope of the claims. For example, the reserve tank 10 can be integrally manufactured by injection molding using a resin. In particular, the reserve tank 10A can be blow molded. However, the method of manufacturing the reserve tank 10 is not limited to injection molding. The storage tank 10 is not limited to the case where the top wall 14 is formed at the upper end of the peripheral wall 12. The drain pipe structure and the structure of the drain system 100 according to the present invention are not limited to the above-described structures. For example, although the appliance drain pipe 120 and the siphon drain pipe 130 have been described as having the upstream portion (horizontal pipe) and the downstream portion (vertical pipe) as the integrated drain pipe, the appliance drain pipe 120 and the siphon drain pipe 130 can be formed by providing the upstream portion (horizontal pipe) and the downstream portion (vertical pipe) as separate drain pipes and connecting the drain pipes to each other. The various configurations adopted in the storage tank 10A and the storage tank 10B can be appropriately exchanged with each other.

Claims

1. A drain pipe structure, wherein,

this drain pipe structure includes:

a storage tank connected to the inflow pipe and the outflow pipe; and

and a communication portion that is connected to the outlet pipe and the storage tank so as to communicate the outlet pipe with the storage tank.

2. The drain construction of claim 1, wherein,

the communicating part is provided with a silencer,

the muffler has a tubular passage through which the muffler passes,

the tubular passage includes an inlet portion that opens into the outflow tube and an outlet portion that opens into the reservoir.

3. The drain construction of claim 2, wherein,

the muffler is provided with a vent pipe leading to the outlet portion and the storage tank.

4. The drain construction of claim 2 or 3, wherein,

the tubular passage is provided with a trifurcated branch passage on the inlet portion side,

the inflow passage of the trifurcated branch passage leads to the inlet portion,

the tail end of the outflow passage on one side of the three-fork branch passage is closed,

the other side of the three-fork branch passage is communicated with the outlet part.

5. The drain pipe construction according to any one of claims 2 to 4, wherein,

the tubular passage includes a small cross-sectional area portion having a cross-sectional area smaller than a cross-sectional area of the inlet portion.

6. The drain pipe construction according to any one of claims 2 to 5, wherein,

the tubular passage is provided with a return passage.

7. The drain construction of claim 2 or 3, wherein,

the other side of the three-fork branch passage is communicated with the outlet part,

the other-side outflow passage includes a small cross-sectional area portion having a cross-sectional area smaller than that of the inlet portion.

8. The drain construction of claim 2 or 3, wherein,

the other-side outflow passage is provided with a return passage.

9. The drain construction of claim 2 or 3, wherein,

the other-side outflow passage includes a small-cross-sectional-area portion having a cross-sectional area smaller than that of the inlet portion, and a folded passage.

10. The drain pipe construction according to any one of claims 2 to 9, wherein,

the bottom of the outlet is disposed above the bottom of the inlet.

11. The drain pipe construction according to any one of claims 2 to 10, wherein,

the communicating portion includes an outlet pipe side pipe portion connected to the outlet pipe and the muffler and a storage tank side pipe portion connected to the muffler and the storage tank,

the outlet pipe side duct portion is a bent pipe rising upward from the outlet pipe,

the reservoir-side pipe portion is a straight pipe extending in parallel with the outflow pipe.

12. The drain pipe construction according to any one of claims 4, 7 to 9,

the branch part of the three-fork branch passage is in a T shape.

13. The drain pipe construction according to any one of claims 1 to 12, wherein,

the outflow pipe is a siphon drain.