JP7382204B2 - Silencer for drain pipe structure - Google Patents

Description

The present invention relates to a silencer.

Conventional drainage systems include, for example, a silencer in which a siphon drain pipe connected to a storage tank is provided with a vent pipe that allows air from outside the storage tank to flow into it (see, for example, Patent Document 1). According to such a silencer, it is possible to suppress the generation of abnormal noise when the siphon drain pipe sucks air together with waste water at the connection part with the storage tank.

JP2017-190626A

However, conventional silencers have room for improvement in suppressing abnormal noise.

An object of the present invention is to provide a novel muffler in which abnormal noise is suppressed.

The silencer according to the present invention has a tubular passage, and the tubular passage includes an inlet connected to a side of a sound source, an outlet connected to a side other than the sound source, and a side of the inlet. a three-pronged branch passageway, an inflow passage of the three-pronged branch passageway communicating with the inlet portion, and an outflow passageway on one side of the three-pronged branching passageway, the end of the one-side outflow passageway communicating with the inlet portion; The outlet passage on the other side of the three-pronged branch passage is closed and communicates with the outlet portion. The muffler according to the present invention is a novel muffler in which abnormal noise is suppressed.

The silencer according to the present invention preferably includes a ventilation pipe communicating with the outlet section. In this case, abnormal noise can be suppressed more effectively.

In the silencer according to the present invention, it is preferable that the tubular passage includes a small cross-sectional area portion that is smaller in cross-sectional area than the cross-sectional area of the inlet portion.
In this case, abnormal noise can be suppressed more effectively.

In the silencer according to the present invention, it is preferable that the tubular passage includes a folded passage. In this case, abnormal noise can be suppressed more effectively.

In the silencer according to the present invention, it is preferable that the outlet section is disposed above the inlet section. In this case, inflow and retention of liquid can be suppressed.

In the silencer according to the present invention, the tubular passage includes two extending passages communicating through the folded passage, and mutually adjacent passage side walls of the two extending passages are common walls. is preferred. In this case, the entire silencer can be made more compact.

In the silencer according to the present invention, it is preferable that the common wall is hollowed out by a groove. In this case, the muffler can be easily manufactured by injection molding.

It is preferable that the silencer according to the present invention is formed by a lower member and an upper member attached to the lower member. In this case, the upper part and the lower part can be injection molded separately.

In the silencer according to the present invention, it is preferable that the upper member is a flat member. In this case, liquid leakage can be suppressed.

In the silencer according to the present invention, it is preferable that the branch part of the three-pronged branch passage has a T-shape. In this case, abnormal noise can be suppressed more effectively.

According to the present invention, it is possible to provide a novel muffler in which abnormal noise is suppressed.

FIG. 2 is a plan view showing a drain pipe structure C to which a muffler according to an embodiment of the present invention can be applied. FIG. 2 is a front view showing the drain pipe structure of FIG. 1. FIG. 3 is a sectional view taken along line AA in FIG. 2. FIG. It is a perspective view showing an outflow pipe side piping part, a storage tank side piping part, and an exhaust side ventilation pipe part from above. FIG. 2 is a perspective view showing the periphery of the communication portion of the drain pipe structure in FIG. 1 from above. FIG. 1 is a plan view showing a muffler unit including a muffler according to an embodiment of the present invention. FIG. 7 is a bottom view showing the muffler unit of FIG. 6; FIG. 7 is a right side view of the muffler unit of FIG. 6; FIG. 7 is a left side view of the muffler unit of FIG. 6; FIG. 7 is a rear view of the silencer unit of FIG. 6; FIG. 7 is a front view of the muffler unit of FIG. 6; 7 is a cross-sectional view corresponding to AA of the silencer unit in FIG. 6. FIG. 7 is a sectional view taken along line BB in FIG. 6. FIG. 7 is a sectional view taken along line CC in FIG. 6. FIG. 7 is a sectional view taken along line DD in FIG. 6. FIG. 7 is a sectional view taken along line EE in FIG. 6. FIG. FIG. 7 is a perspective bottom view showing the muffler unit of FIG. 6 from below. FIG. 7 is a perspective view showing the lower member of the muffler unit of FIG. 6 from above. FIG. 7 is a perspective view showing the upper member of the muffler unit of FIG. 6 from below. FIG. 4 is an enlarged sectional view of FIG. 3 for explaining an opening closing step of the drain pipe cleaning method. 21 is a cross-sectional view taken along the line FF in FIG. 1 for explaining a cleaning liquid flowing step of the drain pipe cleaning method according to FIG. 20. FIG. It is a top view which shows the piping joint as an example of a suitable piping joint when two systems of upstream piping are made to merge into one downstream piping. 23 is a front view showing the piping joint of FIG. 22. FIG. 23 is a rear view showing the piping joint of FIG. 22. FIG. 24 is a sectional view taken along line GG in FIG. 23. FIG. FIG. 23 is an enlarged cross-sectional view of the piping provided with the piping joint of FIG. 22; FIG. 27 is a plan view showing an example of a piping structure installed in an apartment complex for explaining a method of cleaning a drain pipe using the piping shown in FIG. 26; FIG. 2 is a perspective view of the inlet side of an exemplary reservoir from above. FIG. 2 is a perspective view showing the outflow side of the storage tank in FIG. 1 from above. FIG. 2 is a front view showing the inflow side of the storage tank in FIG. 1. FIG. FIG. 2 is a rear view showing the outflow side of the storage tank in FIG. 1; FIG. 2 is a plan view showing the storage tank of FIG. 1 from above. FIG. 2 is a bottom view showing the storage tank of FIG. 1 from below. 4 is a sectional view taken along line AA in FIG. 3. FIG. 4 is a sectional view taken along line BB in FIG. 3. FIG. 5 is a sectional view taken along the line CC in FIG. 4. FIG. FIG. 2 is a right side view showing the storage tank of FIG. 1 from the right side. FIG. 2 is a left side view showing the storage tank of FIG. 1 from the left side. 6 is a sectional view taken along line DD in FIG. 5. FIG. 6 is a sectional view taken along line EE in FIG. 5. FIG. FIG. 6 is a perspective view showing the FF cross section of FIG. 5 from the inflow side. FIG. 6 is a perspective view showing the GG cross section of FIG. 5 from the inflow side. 6 is a sectional view taken along line GG in FIG. 5. FIG. 6 is a sectional view taken along line HH in FIG. 5. FIG. FIG. 3 is a perspective view from above of the inlet side of another exemplary reservoir; BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic system diagram showing, partially in cross section, an example of a drainage system to which a storage tank according to the present invention can be applied.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In the following description, "upstream" refers to upstream of the drainage and exhaust streams, and "downstream" refers to downstream of the drainage and exhaust streams. Furthermore, in the following description, a "top view" refers to a view showing the object from above, and a "bottom view" refers to a view showing the object from below. Further, a "front view" refers to a view of the object as seen from the downstream side of the drainage flow, and a "rear view" refers to a view of the object as viewed from the upstream side of the drainage flow. Further, the term "right side view" refers to a view of the object as seen from the upstream side of the exhaust flow, and the term "left side view" refers to a view of the object as seen from the downstream side of the exhaust flow.

[Drainage pipe structure and silencer]
FIG. 1 is a plan view showing a drain pipe structure C to which a muffler 1 according to an embodiment of the present invention can be applied. FIG. 2 is a front view showing the drain pipe structure C.

As shown in FIG. 1, the drain pipe structure C has a storage tank 10 connected to an inflow pipe 120 and an outflow pipe 130, and an outflow pipe 130 and a storage tank 10 connected to each other so that the outflow pipe 130 and the storage tank 10 communicate with each other. A communication portion 110 connected to the tank 10 is provided.

In the drain pipe structure C, the inflow pipe 120 is a water side pipe leading to a bathtub or the like. Further, in the drain pipe structure C, the outflow pipe 130 is a horizontally drawn pipe arranged with almost no slope in the horizontal direction. In this example, outflow tube 130 functions as a siphon drain. That is, the outflow pipe 130 can promote drainage from the plumbing side piping through the storage tank 10 by generating siphon force when draining water from the plumbing equipment.

In the drain pipe structure C, the communication section 110 is equipped with a muffler 1 according to an embodiment of the present invention.

The muffler 1 is included in a muffler unit 101. As shown in FIG. 2, the muffler unit 101 is arranged above the outflow pipe 130.

FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG. 3 shows passages formed in the muffler unit 101.

As shown in FIG. 3, the muffler 1 has a tubular passage 3. The tubular passage 3 includes an inlet portion A1 communicating with the outflow pipe 130 and an outlet portion A2 communicating with the storage tank 10.

Moreover, the muffler 1 is equipped with a ventilation pipe 2 communicating with the outlet section A2. The vent pipe 2 communicates with the storage tank 10 together with the outlet section A2. In this embodiment, the vent pipe 2 is included in the muffler unit 101 together with the muffler 1.

Furthermore, the communication section 110 connects an outflow pipe side piping section 140 that is connected to the outflow pipe 130 and the silencer 1, and a storage tank side piping section 150 that is connected to the silencer 1 and the storage tank 10. We are prepared. The outflow pipe side piping section 140 is an elbow pipe that stands upward from the outflow pipe 130. Further, the storage tank side piping section 150 is a straight pipe extending parallel to the outflow pipe 130.

In the drain pipe structure C, the outflow pipe side piping section 140 and the storage tank side piping section 150 are each connected to the muffler unit 101. In this embodiment, the drain pipe structure C further includes an exhaust side ventilation pipe 160.

FIG. 4 is a perspective view showing the outflow pipe side piping section 140, the storage tank side piping section 150, and the exhaust side ventilation pipe 160 from above. Note that in FIG. 4, the storage tank 10 and the muffler unit 101 are omitted. Moreover, FIG. 5 is a perspective view showing the vicinity of the communication portion 110 of the drain pipe structure C from above.

As shown in FIG. 4, the outflow pipe side piping section 140 is an elbow pipe as described above. The outflow pipe side piping part 140 is formed by a vertical pipe part 141 that stands upward from the outflow pipe 130 and a horizontal pipe part 142 that continues to the vertical pipe part 141 . As shown in FIG. 5, in the drain pipe structure C, the vertical pipe part 141 of the outflow pipe side piping part 140 is connected to the outflow pipe 130. Further, as shown in FIG. 5, the horizontal pipe section 142 of the outflow pipe side piping section 140 is connected to the muffler unit 101. Thereby, as shown in FIG. 5, the outflow pipe 130 communicates with the muffler unit 101.

Moreover, as shown in FIG. 4, the storage tank side piping part 150 is a straight pipe as described above. As shown in FIG. 5, in the drain pipe structure C, one end 150a of the storage tank side piping section 150 is connected to the muffler unit 101. Further, as shown in FIG. 5, the other end 150b of the storage tank side piping section 150 is connected to the storage tank 10. Thereby, as shown in FIG. 5, the outflow pipe 130 communicates with the storage tank 10 via the muffler unit 101.

Further, as shown in FIG. 4, the exhaust side ventilation pipe 160 is a straight pipe leading to the outside. As shown in FIG. 5, the exhaust side vent pipe 160 is connected to the muffler unit 101. Thereby, as shown in FIG. 5, the outflow pipe 130 communicates with the exhaust side ventilation pipe 160 via the muffler unit 101. In addition, as shown in FIG. 5, the storage tank 10 also communicates with the exhaust side vent pipe 160 via the muffler unit 101. That is, the outflow pipe 130 and the storage tank 10 communicate with the outside through the exhaust side ventilation pipe 160.

FIG. 6 is a plan view showing the muffler unit 101. Moreover, FIG. 7 is a bottom view showing the muffler unit 101. As shown in FIGS. 6 and 7, the muffler unit 101 is a flat unit. The muffler unit 101 has an inflow side connection part 101a. An outflow pipe side piping section 140 is connected to the inflow side connection section 101a. FIG. 8 is a right side view of the muffler unit 101. As shown in FIG. 8, the inflow side connection part 101a of the muffler unit 101 communicates with the inlet part A1 of the tubular passage 3. As shown in FIG.

FIG. 9 is a left side view of the muffler unit 101. As shown in FIG. 9, the muffler unit 101 has a storage tank side connection part 101b and an exhaust side connection part 101c. A storage tank side piping section 150 is connected to the storage tank side connection section 101b. FIG. 10 is a rear view of the muffler unit 101. As shown in FIG. 10, an opening on one side of the passage 4 of the ventilation pipe 2 is formed in the storage tank side connection portion 101b. An exhaust side ventilation pipe 160 is connected to the exhaust side connection portion 101c. FIG. 11 is a front view of the muffler unit 101. As shown in FIG. 11, an opening on the other side of the passage 4 of the ventilation pipe 2 is formed in the exhaust side connection portion 101c. That is, in the drain pipe structure C, the passage 4 of the exhaust pipe 2 opens to both the storage tank side connection part 101b and the exhaust side connection part 101c.

FIG. 12 is an AA cross-sectional view of the silencer unit 101.

As shown in FIG. 12, the tubular passage 3 includes an inlet part A1 connected to the sound source side, an outlet part A2 connected to the side other than the sound source, and a three-pronged branch passage 31 arranged on the side of the inlet part A1. It is equipped with. The inflow passage 31a of the three-pronged branch passage 31 communicates with the inlet portion A1. The one-side outflow passage 31b of the three-pronged branch passage 31 is closed at its end 31be. The other side outflow passage 31c of the three-pronged branch passage 31 communicates with the outlet portion A2.

In the silencer 1, the branch portion 31J of the three-pronged branch passage 31 is T-shaped.

As shown in FIG. 12, the branch portion 31J is a portion where the inflow passage 31a branches into an outflow passage 31b on one side and an outflow passage 31c on the other side. In other words, it is a confluence portion of three passages: the inflow passage 31a, the one side outflow passage 31b, and the other side outflow passage 31c. In the drain pipe structure C, the inflow passage 31a extends in the same direction as the one side outflow passage 31b. As shown in FIG. 12, the other side outflow passage 31c is connected perpendicularly to the inflow passage 31a and the one side outflow passage 31b in plan view. In the drain pipe structure C, an introduction port A3 to the other side outflow passage 31c is formed between the inflow passage 31a and the one side outflow passage 31b. As a result, as shown in FIG. 12, in plan view, the branch portion 31J of the three-pronged branch passage 31 is connected such that the one side outflow passage 31b is orthogonal to the inflow passage 31a and the one side outflow passage 31b. It is T-shaped.

As shown in FIG. 12, if a three-pronged branch passage 31 is provided on the side of the inlet A1 of the tubular passage 3, the sound input from the inlet A1 is divided into an input wave traveling through the inflow passage 31a and an input wave traveling through the one side outflow passage. A composite wave is obtained by combining the reflected wave that bounced back from the end 31be of the waveform 31b. Furthermore, the synthesized wave is introduced into the other side outflow passage 31c through the introduction port A3. Thereby, the frequency distribution of the sound input from the entrance portion A1 can be changed to the frequency band side (low frequency side in this example) where the sound is easily attenuated. In addition, in the three-pronged branch passage 31, if the length from the inlet A3 to the end 31be of the one side outflow passage 31b (the depth dimension of the one side outflow passage 31b) is L1, the length L1 is the same as that between the inlet A1 and the outlet. It can be set as appropriate depending on the shape, size, dimensions, etc. of the portion A2 and the three-pronged branch passage 31. A specific example of the length L1 is about 20 mm.

Furthermore, in the muffler 1, the tubular passage 3 includes a small cross-sectional area portion that is smaller in cross-sectional area than the cross-sectional area SA1 of the inlet portion A1.

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 portion A1. Further, the cross-sectional area S31b of the one-side outflow passage 31b of the three-pronged branch passage 31 is also smaller than the cross-sectional area SA1 of the inlet portion A1. Furthermore, in this 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 end 31be of the one-side outflow passage 31b. Furthermore, the cross-sectional area SA3 of the inlet portion A3 is smaller than the cross-sectional area S31a of the inflow passage 31a. Similarly, the cross-sectional area S31c of the other side outflow passage 31c of the three-pronged branch passage 31 is also smaller than the cross-sectional area SA1 of the inlet portion A1. That is, in the drain pipe structure C, the entire three-pronged branch passage 31 has a small cross-sectional area. However, according to the present invention, at least a portion of the tubular passageway 3 may be provided with the small cross-sectional area portion. Further, the relationship between the cross-sectional area SA1 of the inlet portion A1 and the cross-sectional area of the small cross-sectional area portion provided in the tubular passage 3 is determined by the shape and size of the inlet portion A1, the outlet portion A2, and the three-pronged branch passage 31. It can be set appropriately depending on dimensions and the like. As a specific example, the inner diameter of the inlet portion A1 is equivalent to 25A, and the inner diameter of the introduction port A3 of the three-pronged branch passage 31 is equivalent to 13A.

Furthermore, in the silencer 1, the tubular passage 3 includes a folded passage 3t.

According to the present invention, at least one folded passage 3t may be provided in at least a portion of the tubular passage 3. As shown in FIG. 12, in the drain pipe structure C, the three-pronged branch passage 31 is provided with a plurality of (five in this example) turn-back passages 3t. Thereby, in this embodiment, the length (distance) of the small cross-sectional area portion is ensured to be longer while keeping the size of the muffler 1 compact.

More specifically, the other side outflow passage 31c of the three-pronged branch passage 31 passes through the inlet portion A3 and is turned back along the inflow passage 31a. That is, in this embodiment, a folded passage 3t is formed near the introduction port A3 of the three-pronged branch passage 31. Thereby, the inflow passage 31a and the other side outflow passage 31c of the three-pronged branch passage 31 form two extending passages that communicate via the folded passage 3t. 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 constant angle α0 so as to open from each other from the folded passage 3t as a base point in plan view.

Furthermore, in the drain pipe structure C, the other side outflow passage 31c of the three-pronged branch passage 31 includes three folded passages 3t. Thereby, in the drain pipe structure C, the adjacent passages 31c1 of the other side outflow passage 31c, which are adjacent to each other, form two extending passages that communicate via the folded passage 3t. Further, as shown in FIG. 12, the two adjacent passages 31c1 also extend at a constant angle α0 so as to open from each other from the folded passage 3t as a base point in plan view. As a result, according to the present embodiment, the length of the two adjacent passages 31c1 can be ensured longer by the angle α0, so that the length of the small cross-sectional area portion is further ensured. However, according to the invention, the two adjacent passages 31c1 can also extend parallel to each other.

Furthermore, in the drain pipe structure C, the exhaust side connection part 101c side of the passage 4 of the ventilation pipe 2 passes through the outlet part A2 and is folded back in the direction of returning along the other side outflow passage 31c of the three-pronged branch passage 31. . That is, in the drain pipe structure C, a folded passage 3t is also formed near the outlet A2 of the three-pronged branch passage 31. Thereby, the other side outflow passage 31c of the three-pronged branch passage 31 and the passage 4 of the ventilation pipe 2 form two extending passages that communicate via the folded passage 3t. 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 ventilation pipe 2 are also extended at a constant angle α0 so as to open to each other from the folded passage 3t as a base point in plan view. . Thereby, in the drain pipe structure C, the size of the muffler unit 101 is kept compact, and the length of the small cross-sectional area portion is ensured to be longer. However, according to the present invention, the other side outflow passage 31c of the three-pronged branch passage 31 and the passage 4 of the ventilation pipe 2 can be made to extend parallel to each other.

Note that the position and number of the folded passages 3t can be appropriately set depending on the shapes, sizes, dimensions, etc. of the inlet portion A1, the outlet portion A2, and the three-pronged branch passage 31. For example, the position and number of the folded passages 3t can be set so as not to interfere with or protrude from members arranged around the silencer 1 (in this example, the storage tank 10 and the outflow pipe 130). As a specific example, the position and number of the turn-back passages 3t may be set so that the other side outflow passage 31c of the three-pronged branch passage 31 has a total length of 363 mm or more. However, according to the present invention, it is also possible to ensure a longer length (distance) of the small cross-sectional area portion without providing the folded passage 3t.

Further, in the drain pipe structure C, the outlet portion A2 is arranged above the inlet portion A1. Accordingly, in this 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 A1.

FIG. 13 is a sectional view taken along line BB in FIG. Here, the BB cross section is a cross section including the central axis O1 of the entrance portion A1 in plan view, as shown in FIG. Further, FIG. 14 is a sectional view taken along the line CC in FIG. Here, as shown in FIG. 12, the CC cross section is a cross section that includes the central axis O2 of the outlet portion A2 in plan view.

As shown in FIGS. 13 and 14, in the drain pipe structure C, the bottom (lower end) E2 of the outlet portion A2 is located above the bottom (lower end) E1 of the inlet portion A1. Furthermore, as shown in FIGS. 13 and 14, the bottom (lower end) E3 of each tubular passage 3 is viewed from the upstream direction (downstream direction) on the drainage side, and the imaginary line L31 connecting each bottom E3 of the tubular passage 3 is horizontal. It is formed to be inclined downward at an angle α1 toward the inlet portion A1 with respect to the axis Oy. As a result, the bottom E3 of the tubular passage 3 is formed between the outlet A2 and the inlet A1 so that the bottom E3 of the tubular passage 3 is inclined downward at an angle α1 toward the inlet A1. There is. A specific example of the angle α1 is α1=3°.

FIG. 15 is a sectional view taken along line DD in FIG. Here, the DD cross section is a cross section passing through the inflow passage 31a of the three-pronged branch passage 31 in plan view, as shown in FIG. Further, FIG. 16 is a sectional view taken along line EE in FIG. Here, the EE cross section is a cross section passing through the other side outflow passage 31c of the trifurcated branch passage 31 in plan view, as shown in FIG.

As shown in FIGS. 15 and 16, in the drain pipe structure C, the bottom (lower end) E3 of each tubular passage 3 is directed toward the inlet A1 with respect to the horizontal axis Oy when viewed in the upstream direction (downstream direction) on the ventilation side. It is formed so as to be inclined downward at an angle α2. In this embodiment, the bottom E3 of the inflow passage 31a of the three-pronged branch passage 31 and the bottom E3 of each extension passage 31c1 of the other side outflow passage 31c of the three-pronged branch passage 31 are both connected to the outlet part A2 and the inlet part A1. In between, the bottom E3 of the tubular passage 3 is formed to be inclined downward at an angle α2 toward the inlet A2. A specific example of the angle α2 is α2=1°.

Furthermore, in the muffler 1, the tubular passage 3 includes two extending passages that communicate via a folded passage 3t. The mutually adjacent passage side walls of the two extending passages are common walls 32 .

As shown in FIG. 12, the tubular passage 3 includes an inflow passage 31a and an outflow passage 31c on the other side of the three-pronged branch passage 31, which communicate with each other via a folded passage 3t, as the two extending passages. The mutually adjacent passage side walls of the inflow passage 31a and the other side outflow passage 31c are common walls 32. Further, as shown in FIG. 12, the other side outflow passage 31c of the three-pronged branch passage 31 is provided with two extension passages 31c1, which communicate with each other via a folded passage 3t, as the two extension passages. The mutually adjacent passage side walls of the two extending passages 31c1 are common walls 32. Further, the tubular passage 3 includes the other side outflow passage 31c of the three-pronged branch passage 31 and the passage 4 of the ventilation pipe 2, which communicate with each other via the folded passage 3t, as the two extending passages. The mutually adjacent passage side walls of the other side outflow passage 31c of the three-pronged branch passage 31 and the passage 4 of the ventilation pipe 2 are also common walls 32.

As shown in FIG. 12, in the drain pipe structure C, the muffler unit 101 is provided with five common walls 32. Moreover, as shown in FIG. 12, each common wall 32 is a part of the mutually adjacent passage side walls of two extending passages in 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 the entirety of the passage side walls. Further, according to the present invention, the common wall 32 formed on the passage side wall adjacent to the two extending passages 31c1 of the other side outflow passage 31c of the three-pronged branch passage 31 can be the entirety of the passage side wall. . Further, according to the present invention, the common wall 32 formed on the mutually adjacent passage side walls of the other side outflow passage 31c of the three-pronged branch passage 31 and the passage 4 of the ventilation passage 2 can be the entirety of the passage side wall. .

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

In this embodiment, the common wall 32 is hollowed out by a groove 33.

In this embodiment, as shown in FIG. 17, each of the five common walls 32 is hollowed out by a groove 33 formed on the outer surface of the muffler unit 101.

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

In the drain pipe structure C, the muffler 1 is formed as a muffler unit 101 including the ventilation pipe 2 by a lower member M1 and an upper member M2 attached to the lower member M1.

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 ventilation tube 2 are constituted by grooves formed in the lower member M1. The lower member M1 is provided with a flange portion 34 on its mating surface with the upper member M2 to ensure a bonding area with the upper member M2. Further, the lower member M1 is provided with a convex portion 35 for fitting the upper member M2. In this 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 member M2 is a flat member.

As shown in FIG. 19, a recess 36 into which the upper member M2 is fitted is provided on the back surface of the upper member M2. By fitting the concave portion 36 into the convex portion 35 of the lower member M1, it is possible to align the lower member M1 and the upper member M2 and to fix the upper member M2 to the lower member M1. Furthermore, in this embodiment, as shown in FIG. 6, ribs 37 are provided on the surface of the upper member M2. The ribs 37 can not only reinforce the upper member M2, but also prevent the upper member M2 from warping, which occurs when the upper member M21 is injection molded, for example.

Conventional drain pipe structures still have room for improvement in suppressing abnormal noises that occur when draining water from a siphon drain pipe connected to a storage tank.

On the other hand, in the drain pipe structure C, the outflow pipe 130 and the storage tank 10 are connected so that the storage tank 10 is connected to the inflow pipe 120 and the outflow pipe 130, and the outflow pipe 130 and the storage tank 10 are connected to each other. A communication section 110 connected to the communication section 110 is provided.

According to the drain pipe structure C, by making the storage tank 10 and the outflow pipe 130 connected to the storage tank 10 communicate with each other through the communication part 110, the communication part 110 can be used as a ventilation pipe for the outflow pipe 130. By doing so, it is possible to suppress abnormal noise that occurs when the outflow pipe 130 sucks air together with drainage at the connection part with the storage tank 10. As described above, according to the present embodiment, with the novel configuration in which the communication portion 110 used as a ventilation pipe for the outflow pipe 130 is merged into the storage tank 10, abnormal noise that occurs when water is drained from the outflow pipe 130 can be suppressed. I can do it.

Therefore, the drain pipe structure C becomes a novel drain pipe structure in which abnormal noise is suppressed. In addition, according to the present embodiment, by merging the communication portion 110 leading to the outflow pipe 130 with the storage tank 10, it is possible to make the ventilation path of the outflow pipe 130 and the ventilation path of the storage tank 10 common. can. Therefore, the drain pipe structure C according to the present embodiment is a drain pipe structure that can save space by reducing the number of piping systems.

Moreover, in the drain pipe structure C, the communication part 110 is equipped with a muffler 1, the muffler 1 has a tubular passage 3, and the tubular passage 3 has an inlet part A1 leading to the outflow pipe 130, An outlet section A2 communicating with the storage tank 10 is provided. In this case, even if an abnormal noise occurs during drainage, the noise can be reduced by the muffler 1. Therefore, in this case, abnormal noise can be further suppressed.

More specifically, as described above, if the storage tank 10 and the outflow pipe 130 connected to the storage tank 10 are communicated through the communication part 110, the outflow pipe 130 is connected to the storage tank 10. It is possible to suppress the generation of abnormal noises that occur when air is sucked in with waste water.

However, when the storage tank 10 and the outflow pipe 130 are made to communicate with each other through the communication part 110, there is a concern that the communication part 110 may suck air together with the waste water at the connection part with the outflow pipe 130, causing abnormal noise. Ru.

However, in reality, the noise is smaller than the noise that occurs when the outflow pipe 130 sucks air together with waste water at the connection part with the storage tank 10.

However, the sound may easily echo inside the storage tank 10. Therefore, when abnormal noise generated at the connection between the communication section 110 and the outflow pipe 130 propagates into the storage tank 10 via the communication section 110, the abnormal noise is reflected within the storage tank 10, causing the abnormal noise to be generated. There is a concern that sound may leak from the storage tank 10 to the outside. The degree of reverberation of such abnormal sounds changes depending on the size, shape, etc. of the storage tank 10. For example, if the capacity of the storage tank 10 is increased and the rigidity of the central portion of the storage tank 10 is decreased, there is a concern that the abnormal noise will resonate more within the storage tank 10.

On the other hand, in the drain pipe structure C, the communication section 110 is equipped with the muffler 1. In this case, even when the communication section 110 generates abnormal noise by sucking air together with waste water at the connection portion with the outflow pipe 130, the abnormal noise propagated via the communication section 110 is reduced. That is, according to the present embodiment, by reducing the abnormal noise propagated to the storage tank 10 via the communication portion 110, it is possible to suppress the echo of the abnormal noise generated within the storage tank 10. Therefore, according to this embodiment, abnormal noise can be further suppressed.

Moreover, in this embodiment, the muffler 1 is equipped with the vent pipe 2 which communicates with the storage tank 10 together with the outlet part A2. In this case, the abnormal noise propagated to the tubular passage 2, that is, the abnormal noise propagated to the storage tank 10, can be further suppressed. Therefore, according to this embodiment, abnormal noise can be suppressed more effectively. In the drain pipe structure C, an exhaust side ventilation pipe 160 is connected to the ventilation pipe 2. In this case, the air in the outflow pipe 130 and the storage tank 10 and the external air located further away from the storage tank 10 can be circulated.

Further, in the silencer 1, the tubular passage 3 is provided with a three-pronged branch passage 31 connected to the sound source side on the inlet part A1 side, and an inflow passage 31a of the three-pronged branch passage 31 communicates with the inlet part A1. One side outflow passage 31b of the three-pronged branch passage 31 is closed at its end 31be, and the other side outflow passage 31c of the three-pronged branch passage 31 is connected to the side other than the sound source. It communicates with the outlet A2.

When abnormal noise from the outflow pipe 130 is input to the inflow passage 31a of the three-pronged branch passage 31, part of the frequency of the abnormal noise is transferred to the inflow passage 31a at the end 31be of the one side outflow passage 31b of the three-pronged branch passage 31. bounce towards you. Thereby, the abnormal sound input to the three-pronged branch passage 31 can be changed to a frequency band in which the sound is easily attenuated. As a specific example, the peak of the sound pressure of the abnormal noise can be changed from a frequency band of 400 Hz to 600 Hz to a low frequency band of 200 Hz to 400 Hz. Therefore, in this case, abnormal noise can be suppressed more effectively.

Furthermore, in the muffler 1, the tubular passage 3 includes a small cross-sectional area portion that is smaller in cross-sectional area than the cross-sectional area SA1 of the inlet portion A1.

The sound pressure of the abnormal noise propagated through the tubular passage 3 can be reduced as the cross-sectional area of the tubular passage 3 becomes smaller. That is, the sound pressure of abnormal noise generated when the communication portion 110 sucks air together with waste water at the connection portion with the outflow pipe 130 can be reduced as the cross-sectional area of the tubular passage 3 is smaller.

According to the present embodiment, the tubular passage 3 includes a small cross-sectional area portion that is smaller in cross-sectional area than the cross-sectional area SA1 of the inlet portion A1. This makes it possible to reduce the sound pressure of abnormal noise that is generated when the communication portion 110 sucks air together with waste water at the connection portion with the outflow pipe 130. Therefore, in this case, abnormal noise can be suppressed more effectively.

Furthermore, in the silencer 1, the tubular passage 3 includes a folded passage 3t.

The lower frequency band of the abnormal noise propagated through the tubular passage 3 can be attenuated as the length of the tubular passage 3 becomes longer. That is, the low frequency band of abnormal noise generated when the communication portion 110 sucks air together with waste water at the connection portion with the outflow pipe 130 can be attenuated as the length of the tubular passage increases.

According to this embodiment, the length of the tubular passage 3 can be ensured longer by providing the folded passage 3t. Therefore, in this case, by ensuring a long length of the tubular passage 3, the sound pressure in the low frequency band can be attenuated. Therefore, in this case, abnormal noise can be suppressed more effectively. Further, by ensuring a long length of the tubular passage 3 by the folded passage 3t, it is possible to make the entire muffler unit 101 (silencer 1) more compact, and by extension, the entire drain pipe structure C can be made more compact.

Furthermore, the muffler 1 is equipped with a ventilation pipe 2 that communicates with the outlet section A2. In this case, abnormal noise propagated to the tubular passage 3 can be further suppressed. Therefore, in this case, abnormal noise can be suppressed more effectively.

Further, in this embodiment, the tubular passage 3 includes a three-pronged branch passage 31 on the side of the inlet A1, and the inflow passage 31a of the three-pronged branch passage 31 communicates with the inlet part A1, and the three-pronged branch passage 31 The end 31be of the one side outflow passage 31b is closed, the other side outflow passage 31c of the three-pronged branch passage 31 communicates with the outlet part A2, and the other side outflow passage 31c is A small cross-sectional area portion is provided where the cross-sectional area S31c is smaller than the cross-sectional area SA1 of the inlet portion A1. 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 also be reduced, so that the abnormal noise can be suppressed more effectively. .

Further, in this embodiment, the tubular passage 3 includes a three-pronged branch passage 31 on the side of the inlet A1, and the inflow passage 31a of the three-pronged branch passage 31 communicates with the inlet part A1, and the three-pronged branch passage 31 The end 31be of the one side outflow passage 31b is closed, the other side outflow passage 31c of the three-pronged branch passage 31 communicates with the outlet part A2, and the other side outflow passage 31c is It is equipped with 3t of turnaround passages. 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 in particular, the sound pressure in the low frequency band can be attenuated, so that the abnormal noise can be suppressed more effectively. can.

Further, in this embodiment, the tubular passage 3 includes a three-pronged branch passage 31 on the side of the inlet A1, and the inflow passage 31a of the three-pronged branch passage 31 communicates with the inlet part A1, and the three-pronged branch passage 31 The end 31be of the one side outflow passage 31b is closed, the other side outflow passage 31c of the three-pronged branch passage 31 communicates with the outlet part A2, and the other side outflow passage 31c is It includes a small cross-sectional area portion whose cross-sectional area is smaller than the cross-sectional area SA1 of the entrance portion A1, and also includes a folded passage 3t. In this case, the frequency band of the abnormal sound can be changed to a frequency band in which the sound is easily attenuated, and the sound pressure of the abnormal sound can be reduced, and in particular, the sound pressure of the low frequency band can be attenuated. Therefore, abnormal noise can be suppressed most effectively.

Further, in this embodiment, the outlet portion A2 is arranged above the inlet portion A1, and the bottom portion E3 of the tubular passage 3 is inclined downward toward the inlet portion A1. It is formed to do so. In this embodiment, as described above, the angles α1 and α2 are inclined. In this case, it is possible to suppress the inflow of liquid from the inlet A1, and even if liquid such as washing water flows in, it can be easily discharged from the inlet. That is, in this case, the inflow and retention of liquid can be suppressed. In particular, in this embodiment, the tubular passage 3 is folded back at an angle α0 with the folded passage 3t as a base point. Accordingly, in this embodiment, the inlet passage 31a of the three-pronged branch passage 31, the other side outflow passage 31c (adjacent passage 31c1), and the passage 4 of the ventilation pipe 2 are each inlet as shown in FIG. It is inclined at an angle α1×(1/2) with respect to the central axis O1 of the portion A1. In this case, even if liquid flows into the tubular passage 3, the liquid can be guided toward the inlet A1.

In the present embodiment, the communication section 110 includes an outflow pipe side piping section 140 connected to the outflow pipe 130 and the muffler 1, and a storage tank side piping section connected to the muffler 1 and the storage tank 10. The outflow pipe side piping part 140 is an elbow pipe standing upward from the outflow pipe 130, and the storage tank side piping part 150 is a straight pipe extending parallel to the outflow pipe 130. It's a tube. In this case, the inflow of liquid from the inlet A1 can be suppressed, and even if the liquid does flow in, it can be easily discharged from the inlet A1. That is, in this case, the inflow and retention of liquid can be suppressed. Further, in this case, since the communication portion 110 has a compact piping configuration, the entire drain pipe structure C can be made more compact.

Further, in this embodiment, the branch portion 31J of the three-pronged branch passage 31 is T-shaped. In this case, the inflow passage 31a of the three-pronged branch passage 31 and the outflow passage 31b on one side of the three-pronged branch passage 31 merge in a straight line with each other, so that the abnormal noise input from the inflow passage 31a and the one side outflow passage 31b of the three-pronged branch passage 31 are The abnormal noise reflected from the one-side outflow passage 31b can be effectively offset. Therefore, in this case, abnormal noise can be suppressed more effectively.

Further, in this embodiment, the outflow pipe 130 is a siphon drain pipe. The outflow pipe 130 is a siphon drain pipe arranged with almost no slope in the horizontal direction. As mentioned above, the siphon drain pipe may generate abnormal noise by sucking in air along with drainage at the connection part with the storage tank. In this case, it is effective in suppressing abnormal noise.

Furthermore, in the present embodiment, in the muffler 1, the tubular passage 3 is provided with two extending passages communicating via a folded passage 3t, and the adjacent passage side walls of the two extending passages are shared walls. It is 32. In this case, the entire silencer 1 can be made more compact.

Further, in the present embodiment, in the muffler 1, the common wall 32 is hollowed out by a groove 33. In this case, the muffler 1 can be easily manufactured by injection molding. In particular, in this embodiment, the muffler 1 and the ventilation pipe 2 form a muffler unit 101. Therefore, in this embodiment, as the muffler unit 101, the muffler 1 and the ventilation pipe 2 can be easily manufactured by injection molding.

Moreover, in this embodiment, the muffler 1 is formed by a lower member M1 and an upper member M2 attached to the lower member M1. In this case, by forming the lower member M1 and the upper member M2 with two members, the lower member M1 and the upper member M2 can be injection molded separately.

Moreover, in this embodiment, in the muffler 1, the upper member M2 is a flat member. In this case, since the mounting surface (joint surface) between the lower member M1 and the upper member M2 can be set at a high position, leakage of liquid through the mounting surface can be suppressed.

[How to clean the drain pipe]
Next, a method for cleaning a drain pipe 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 the drain pipe is cleaned by flowing a cleaning liquid into the drain pipe to which the ventilation pipe is connected via the connecting piping section.

In the present embodiment, the drain pipe cleaning method includes inserting a rod-shaped member provided with a blocking member into the passage of the ventilation pipe to open an opening formed in the ventilation pipe that communicates with the connection piping section. , a step of closing the opening with the closing member (hereinafter also referred to as "opening closing step"), and a step of flowing cleaning liquid into the passage of the drain pipe after closing the opening (hereinafter referred to as "cleaning liquid flowing step") ) and includes.

Referring to the above-mentioned drain pipe structure C, in this embodiment, the vent pipe is the vent pipe 2 of the muffler unit 101. In this example, the vent pipes also include an exhaust side vent pipe 160. Further, in this embodiment, the connection piping section includes a drain pipe side piping section 140, a muffler unit 101, a storage tank side piping section 150, and an exhaust side ventilation pipe 160. Furthermore, in this embodiment, the opening is the outlet A2 of the silencer 1.

The rod-shaped member provided with the closing member is a wire tool that can be inserted into the pipe. Specific examples of the rod-shaped member include a single wire or a twisted wire. The wires include not only metal wires but also synthetic resin wires. Specific examples of the closing member include a brush made of bundled linear members such as hair, an elastic member such as rubber, and a porous member such as a sponge.

FIG. 20 is an enlarged sectional view of FIG. 3 for explaining the opening closing step.

In FIG. 20, reference numeral 50 is a rod-shaped member. In this example, it is a metal wire. In this example, the rod-shaped member 50 has flexibility. Reference numeral 51 is a closing member. In this example, the closing member 51 is a brush.

As shown in FIG. 20, in the opening closing step, the rod-shaped member 50 is inserted into the passage 4 of the ventilation pipe 2 to close the outlet A2 of the silencer 1 with the closing member 51.

FIG. 21 is a sectional view taken along the line FF in FIG. 1 for explaining the cleaning liquid flowing step.

In FIG. 21, reference numeral 60 is a high-pressure cleaning hose equipped with a high-pressure cleaning nozzle 61. In this example, the hose 60 is flexible. The high-pressure cleaning hose 60 includes not only synthetic resin hoses but also metal hoses.

After closing the outlet A2 of the silencer 1, as shown in FIG. 21, in the cleaning liquid flowing step, the high pressure cleaning nozzle 61 is inserted into the passage of the outflow pipe 130. The cleaning liquid is injected from the high-pressure cleaning nozzle 61 toward the downstream of the outflow pipe 130 under high pressure. Thereby, the outflow pipe 130 can be cleaned.

As described above, according to the present embodiment, in the opening closing step, by inserting the rod-shaped member 50 into the passage 4 of the ventilation pipe 2, the closing member 51 provided on the rod-shaped member 50 closes the ventilation pipe 2. The formed outlet portion A2 of the silencer 1 is closed. Thereby, the passage 4 of the ventilation passage 2 can be blocked off from the passage leading to the outflow pipe 130. Next, according to the present embodiment, after closing the outlet A2, the cleaning liquid is flowed into the passage of the outflow pipe 130 in the cleaning liquid flowing step. Thereby, the passage of the outflow pipe 130 can be washed and the outflow pipe 130 can be cleaned. A high-pressure cleaning nozzle 61 is inserted into the passage of the outflow pipe 130, and the cleaning liquid can be injected into the passage of the outflow pipe 130 from the high-pressure cleaning nozzle 61.

According to this embodiment, the closing member 51 prevents the cleaning liquid from flowing into the vent pipe 2 from the outflow pipe 130 . Therefore, according to the drain pipe cleaning method according to the present embodiment, the drain pipe can be cleaned without flowing the cleaning liquid into the ventilation pipe 2.

Further, as shown in FIG. 21, in the drain pipe cleaning method of this embodiment, the ventilation pipe 2 is located at a higher position than the outflow pipe 130. In this case, the inflow of the cleaning liquid into the vent pipe 2 is more reliably prevented, and even if the cleaning liquid does flow in, it can be easily discharged. That is, in this case, the inflow and retention of the cleaning liquid can be suppressed.

Further, as shown in FIG. 20, in the drain pipe cleaning method of this embodiment, the ventilation pipe 2 is connected from the insertion opening of the rod-shaped member 50 formed in the ventilation pipe 2 to the outlet portion A2 of the silencer 1. The space between them extends horizontally. In this case, since there is no difference in level up to the outlet A2 leading to the muffler 1, the closing member 51 can easily pass through the passage 4 of the ventilation pipe 2. That is, in order to clean the outflow pipe 130, it is possible to easily close the outlet A2 leading to the muffler 1. Therefore, in this case, the outflow pipe 130 can be easily cleaned.

Moreover, as shown in FIG. 20, in this embodiment, in the drain pipe cleaning method, the closing member 51 is a brush. In this case, the brush has flexibility and can easily pass the closing member 51 through the passage 4 of the ventilation pipe 2. Therefore, it is possible to easily close the outlet A2 leading to the muffler 1. Therefore, in this case, the outflow pipe 130 can be easily cleaned. Further, in this case, it is possible to scrape out dirt such as liquid and dirt adhering to the passage 4 of the ventilation pipe 2 (including the passage of the exhaust side ventilation pipe 160). Therefore, in this case, the ventilation pipe 2 can be cleaned together with the outflow pipe 130. Moreover, it is preferable that the brush has water absorbency. In this case, since liquid such as cleaning liquid adhering to the passage 4 of the ventilation pipe 2 can be removed, the ventilation pipe 2 can be effectively cleaned.

In addition, as shown in FIG. 20, in the drain pipe cleaning method of this embodiment, the ventilation pipe 2 is connected to the insertion port of the rod-shaped member 50 and the outlet portion A2 of the passage 4 of the ventilation pipe 2, which communicates with the silencer 1. An insertion restriction portion 151 against which the rod-shaped member 50 can be abutted is provided at a position on the opposite side of the insertion restriction portion 151 . In this case, by simply passing the rod-shaped member 50 through the passage 4 of the ventilation pipe 2, the closing member 51 can be positioned at an appropriate position to close the outlet portion A2, as shown in FIG. can. That is, in order to clean the outflow pipe 130, it is possible to easily close the outlet A2 leading to the muffler 1. Therefore, in this case, the outflow pipe 130 can be easily cleaned. As shown in FIG. 4, in this embodiment, the insertion restriction portion 151 is the end portion of the reservoir side piping portion 150. In this embodiment, the storage tank side piping section 150 is a cylindrical member with the end portion closed. An opening A4 communicating with the storage tank 10 is formed in the storage tank side piping section 150. Note that the insertion restriction portion 151 is not limited to the end portion serving as a sealing wall as in this embodiment. For example, the insertion restriction portion 151 may be a protrusion provided on the reservoir side piping portion 150.

Moreover, as shown in FIG. 20, in this embodiment, in the drain pipe cleaning method, the connecting pipe section is equipped with a muffler 1. In this case, the outflow pipe 130 connected to the muffler 1 can be easily cleaned.

Further, as shown in FIG. 21, in the drain pipe cleaning method of this embodiment, the outflow pipe 130 is connected to the storage tank 10, and the ventilation pipe 2 is connected to the same storage tank as the storage tank 10. has been done. In this case, the outflow pipe 130 can be cleaned by consolidating the plurality of ventilation pipes and reducing the number of the plurality of ventilation pipes.

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

Vent pipes are generally not intended to pass water, and water entry and retention is undesirable. In particular, in the present embodiment, the outflow pipe 130 is a horizontally drawn siphon drain pipe that is disposed with almost no slope in the horizontal direction. In this case, the drainage filling the siphon drain pipe acts as a resistance to the high-pressure washing water, which further increases the concern that the high-pressure washing water and the like will flow into the vent pipe 2. Therefore, when the outflow pipe 130 is a siphon drain pipe, it is effective in suppressing the inflow and retention of the cleaning liquid.

[Piping fittings]
By the way, by merging two upstream pipes into one downstream pipe, space can be saved by reducing the number of piping systems.

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

FIG. 22 is a plan view showing a pipe joint 20 as an example of a suitable pipe joint when two systems of upstream pipes are merged into one downstream pipe. Moreover, FIG. 23 is a front view showing the piping joint 20. Furthermore, FIG. 24 is a rear view showing the piping joint 20. Furthermore, FIG. 25 is a cross-sectional view taken along line GG in FIG. 23.

As shown in FIG. 22, the piping joint 20 includes a first upstream piping section 21 connectable to a first upstream piping, a second upstream piping section 22 connectable to a second upstream piping, and one downstream piping. A downstream piping section 23 connectable to the downstream piping section 23 is provided. Further, as shown in FIG. 25, the passage 21a of the first upstream piping part 21 and the passage 22a of the second upstream piping part 22 communicate with the passage 23a of the downstream piping part 23. Furthermore, the first upstream piping section 21 is oriented with respect to the downstream piping section 23 so as to be oriented in the same direction as the downstream piping section 23 .

Specifically, the passage extension axis O21 of the first upstream piping part 21 is horizontally spaced apart from the passage extension axis O23 of the downstream piping part 23 by ΔY.

According to the piping joint 20, for example, when a linear rod-shaped cleaning tool is used as a cleaning tool inserted from the downstream piping section 23, the cleaning tool is inserted into the first upstream piping section 21 and the second upstream piping section 22. Of these, it is easy to insert it into the first upstream piping section 21 which is parallel to the downstream piping section 23. Further, according to the piping joint 20, for example, when a curly rod-shaped cleaning tool is used as a cleaning tool inserted from the downstream piping section 23, the cleaning tool is inserted into the first upstream piping section 21 and the second upstream piping section 23. Of the piping sections 22, it is easy to insert the second upstream piping section 22 which is not parallel to the downstream piping section 23. Therefore, according to the piping joint 20, the cleaning tool can be removed from among the first upstream piping part 21 and the second upstream piping part 22 without visually checking the first upstream piping part 21 and the second upstream piping part 22. A desired upstream piping section for insertion can be easily selected. Therefore, according to the piping joint 23, the two upstream piping sections, the first upstream piping section 21 and the second upstream piping section 22, which merge into one downstream piping section 23, can be connected without visually checking the two upstream piping sections. A desired upstream piping section for inserting a cleaning tool or the like can be easily selected from among the sections.

Further, in the piping joint 23, the second upstream piping section 22 is preferably oriented in a direction forming an acute angle α12 with respect to the first upstream piping section 21. In this case, a desired upstream piping section can be selected more easily by easily inserting a cleaning tool or the like from the downstream piping section 23 into the first upstream piping section 21 and the second upstream piping section 22. .

Further, in the pipe joint 20, the acute angle α12 is an angle in the range of 15° to 25°. In this case, more cleaning tools and the like of different sizes can be easily inserted.

Further, in the piping joint 20, the passage extension axis O21 of the first upstream piping section 21 is shifted from the passage extension axis O23 of the downstream piping section 23, as described above. In this case, the balance between ease of insertion of the cleaning tool etc. into the first upstream piping section 21 and ease of insertion of the cleaning tool etc. into the second upstream piping section 22 is determined by By adjusting the interval between the passage extension axis O21 of the section 21 and the passage extension axis 23 of the downstream piping section 23, a desired balance can be easily set.

[How to clean piping]
FIG. 26 is an enlarged cross-sectional view of a pipe 200 including a pipe joint 20. As shown in FIG.

In FIG. 26 , reference numeral 210 indicates a first upstream pipe 210 connected to the first upstream pipe section 21 of the pipe joint 20 . Reference numeral 220 indicates a second upstream pipe 220 connected to the second upstream pipe section 22 of the pipe joint 20 . Further, reference numeral 230 is a downstream pipe 230 connected to the downstream pipe section 23 of the pipe joint 20.

The piping 200 can clean desired upstream piping by the following method.

The method of cleaning the piping 200 is a method of cleaning the piping 200 by inserting a rod-shaped member into the piping 200 and cleaning the piping 200. This cleaning method includes the step of inserting the rod-shaped member from the downstream piping 230.

In this example, a cleaning tool 70 is used as the rod-shaped member. The cleaning tool 70 is a wire tool that can be inserted into the pipe 200. In this example, the cleaning tool 70 consists of a rod-shaped member 71 equipped with a brush 72. A specific example of the rod-shaped member 71 is a single wire or a twisted wire. The wires include not only metal wires but also synthetic resin wires. The brush 72 can be the closure member 61 described above.

According to the present embodiment, for example, when a linear cleaning tool 70A is used as the cleaning tool 70 inserted from the downstream piping 230, the cleaning tool 70A is inserted between the first upstream piping 210 and the second upstream piping 220. Of these, it is easier to insert it into the first upstream pipe 210 that is parallel to the downstream pipe 230. Further, when a cleaning tool 70B with curling tendency is used as the cleaning tool 70 inserted from the downstream piping 230, the cleaning tool 70B is inserted into the downstream piping 230 among the first upstream piping 210 and the second upstream piping 220. It is easy to insert the second upstream piping 220 that is not parallel to the second upstream piping 220 . Therefore, according to the method for cleaning the pipe 200 including the pipe joint 20, the first upstream pipe 210 and the second upstream pipe 220 can be cleaned without visually checking the first upstream pipe 210 and the second upstream pipe 220. 220, a desired upstream piping for inserting the cleaning tool 70 can be easily selected. Therefore, according to the method for cleaning the piping 200, it is possible to select a desired upstream pipe from among the two upstream pipings to insert a cleaning tool or the like into the two upstream pipings, without visually checking the two upstream pipings that merge into one downstream piping. Piping can be easily selected.

Further, in the cleaning method of the pipe 200 including the pipe joint 20, at least one of a linear cleaning member 70A and a curling cleaning member 70B can be used as the cleaning member 70. In this case, when inserting the cleaning tool 70 into the first upstream pipe 210, if the linear cleaning member 70A is used as the cleaning tool, the desired first upstream pipe 210 can be selected more easily. . Further, when inserting the cleaning tool 70 into the second upstream pipe 220, if the cleaning member 70B with curling tendency is used as the cleaning tool 70, the desired second upstream pipe 220 can be selected more easily. can. Therefore, in this case, desired upstream piping can be selected more easily.

Further, if one of the first upstream pipe 210 and the second upstream pipe 220 of the pipe 200 is used as the exhaust side ventilation pipe 160 of the above-described drain pipe structure C, the insertion port 230 provided in the downstream pipe 230 The outflow pipe 130 can be cleaned by inserting the rod-shaped member 50 provided with the closing member 51.

[How to clean a drain pipe using piping 200]
As a method for cleaning the pipe 200, there is a drain pipe cleaning method in which the outflow pipe 130 of the drain pipe structure C is cleaned. In this case, the ventilation pipe 2 can be either the first upstream pipe 210 or the second upstream pipe 220. Thereby, by inserting the rod-shaped member 50 provided with the closing member 51 from the passage 230a of the downstream piping 230, through the piping joint 20, and into the passage 4 of the ventilation pipe 2, the outlet portion A2 leading to the silencer 1 is opened. It can be closed with a closing member 51.

FIG. 27 is a plan view showing an example of a piping structure installed in a housing complex such as an apartment.

In FIG. 27, the symbol W is an outer wall that partitions the exclusive area and the common area. Reference characters DP1 to DP4 are drain pipes. In this example, the drain pipe DP1 is a kitchen system drain pipe. Moreover, the drain pipe DP2 is a drain pipe of the washroom system. Moreover, the drain pipe DP3 is a drain pipe of the washing system. Furthermore, the drain pipe DP4 is a drain pipe for the bathroom system. In this example. The drain pipe DP4 is the same drain pipe as the outflow pipe 130 connected to the storage tank 10, or a drain pipe connected to the outflow pipe 130.

Furthermore, the example in FIG. 27 includes a ventilation pipe of an exhaust system composed of piping 200. In this example, the first upstream pipe 210 is a ventilation pipe for the bathroom system, and the second upstream pipe 220 is a ventilation pipe for the laundry room system. Each system in FIG. 27 is provided with an insertion port for inserting a cleaning tool or the like. Reference numeral 240 indicates an insertion port for the exhaust system provided in the pipe 200.

The above-mentioned drain pipe structure C is a drain pipe structure for a bathroom system.

As described above, the method for cleaning the outflow pipe 130 connecting the pipe 200 to the ventilation pipe 2 is to move the rod-shaped member 50 provided with the blocking member 51 from the passage of the downstream pipe 230, through the pipe joint 20, to the passage of the ventilation pipe 2. 4, the outlet part A2 of the silencer 1 formed in the ventilation pipe 2 is closed with the closing member 51, and after the outlet part A2 is closed, the cleaning liquid is flowed into the passage of the outflow pipe 130. and steps.

According to the above cleaning method, in the opening closing step, the rod-shaped member 50 is inserted into the insertion port 240 formed in the pipe 200. At this time, if a linear rod-shaped member is used as the rod-shaped member 50, the rod-shaped member 50 is inserted into the passage of the ventilation pipe 2 by selecting the first upstream piping 210 using the piping joint 20. That is, since the first upstream pipe 210 is oriented in the same direction as the downstream pipe 230, in order to clean the outflow pipe 130, the first upstream pipe 210 is oriented in the same direction as the downstream pipe 230. The work of closing the outlet A2 leading to can be easily performed. Thereby, the outlet part A2 of the silencer 1 formed in the ventilation pipe 2 of the silencer unit 101 can be closed by the closing member 51 provided on the rod-shaped member 50. As a result, the passage 4 of the ventilation passage 2 can be blocked from the passage of the outflow pipe 130, as described above. After closing the outlet A2, in the cleaning liquid flow step, the high-pressure cleaning hose 60 equipped with the high-pressure cleaning nozzle 61 is inserted into the passage of the outflow pipe 130 through the insertion port 250 formed in the drain pipe DP4 of the bathroom system. Drain the cleaning solution. Thereby, the passage of the outflow pipe 130 can be washed and the outflow pipe 130 can be cleaned.

As described above, even in the method of cleaning the outflow pipe 130 in which the piping 200 is connected to the vent pipe 2, the cleaning liquid from the outflow pipe 130 is prevented from flowing into the vent pipe 2 by the closing member 51. Therefore, according to the method for cleaning the outflow pipe 130 described above, the outflow pipe 130 can be cleaned without flowing the cleaning liquid into the ventilation pipe 2.

In addition, in the method of cleaning the outflow pipe 130 that connects the pipe 200 to the ventilation pipe 2, if the rod-shaped member 50 with a bending tendency is used as the rod-shaped member 50, it is possible to insert the rod-shaped member 50 into the second upstream pipe 220. can. Note that "bending habit" as used herein refers to the property that bending deformation remains when a rod-shaped member is stored in a wound state. However, here, the term "bar-shaped member with a bending tendency" includes a bar-shaped member having a pre-bent shape.

[Drainage system to which the present invention can be applied]
FIG. 46 is a schematic system diagram showing, in partial cross section, an example of a drainage system to which the present invention can be applied. In FIG. 46, reference numeral 100 is an example of a drainage system to which a storage tank according to an embodiment of the present invention can be applied. In this example, drainage system 100 is a siphon drainage system. A siphon drainage system is a drainage system that uses the principle of a siphon. According to the siphon drainage system, when draining water from plumbing equipment, the siphon force generated in the siphon drain pipe can promote the drainage. The siphon drainage system is employed, for example, as a drainage system for a housing complex in which one building is divided into multiple floors.

In this example, the drainage system 100 includes a plumbing fixture EW, a fixture drain pipe 120, a storage tank 10, and a siphon drain pipe 130.

Plumbing appliances EW are placed on each floor of the building. Examples of the plumbing fixtures EW include a bathtub (for example, a unit bath), a washstand, and a sink. In this example, the plumbing fixture EW is a bathtub.

The appliance drain pipe 120 connects the plumbing appliance EW and the storage tank 10. In this example, the appliance drain pipe 120 is arranged in the underfloor space S. In this example, the underfloor space S is a space formed between a floor member FM of a building and a floor slab FS. Further, in this example, the appliance drain pipe 120 includes an upstream portion 120a extending in the vertical direction and a downstream portion 120b extending in the horizontal direction. The upstream portion 120a is connected to the plumbing fixture EW. The downstream portion 120b is connected to the upstream portion 120a. In this example, the downstream portion 120b is inclined downward as it goes downstream from the upstream portion 120a. The downstream portion 120b is connected to the storage tank 10. In this example, a drainage trap 121 is interposed in the middle of the downstream portion 120b.

The siphon drain pipe 130 connects the storage tank 10 and the vertical pipe VP. The vertical pipe VP is a drainage pipe that vertically penetrates each floor of the building. In this example, the siphon drain pipe 130 includes a horizontal pipe 130a arranged in the underfloor space S and a vertical pipe 130b penetrating the floor slab FS and hanging downward. The horizontal drawing pipe 130a is connected to the storage tank 10. In this example, the horizontal drawing pipe 130a extends in the horizontal direction so as to be substantially horizontal with no slope. Specifically, the pipes are installed substantially horizontally and without slope along the floor slab FS of the floor where the plumbing fixtures EW are installed. The vertical pipe 130b is connected to the horizontal pipe 130a. The vertical pipe 130b is connected to the vertical pipe 150 via a pipe joint CJ. Specifically, the vertical pipe 130b extends substantially perpendicularly below the horizontal pipe 130a, forms a hanging portion, and generates a siphon force (for example, negative pressure).

In the drainage system 100 of this example, liquid is first flowed out from the plumbing fixture EW through the height difference H1 between the outlet of the plumbing fixture EW and the horizontal drawing pipe 130a of the siphon drain pipe 130. The liquid (for example, water) flowing out of the water fixture EW flows into the storage tank 10 from the fixture drain pipe 120 due to the liquid's own weight (falling pressure). The storage tank 10 stores a portion of the liquid therein while allowing the remaining liquid to flow out to the siphon drain pipe 130.

In this example, the siphon drain pipe 130 forms a siphon drain channel that generates suction force by siphon force. In the siphon drain, the siphon force generated within the siphon drain pipe 130 can facilitate drainage of liquid from the siphon drain pipe 130.

In the siphon drainage channel of this example, due to the height difference H1 between the outlet of the plumbing fixture EW and the horizontal drawing pipe 130a of the siphon drain pipe 130, the falling pressure of the drainage water from the plumbing fixture EW causes the fixture drain pipe 120 and By filling the horizontal draw pipe 130a of the siphon drain pipe 130 with water, the water that has reached the vertical pipe 130b (hanging length H2) of the siphon drain pipe 130 is discharged into the vertical pipe. 130b, and the horizontal draw pipe 130a of the siphon drain pipe 130 becomes full of water, causing a siphon effect. Using this siphon action as drainage power, the high-speed flow generated in the siphon drainage channel drains water from the plumbing fixture EW, and the drainage is smoothly and quickly discharged into the pipe joint CJ.

In this example, since a siphon drainage system is adopted as the drainage system 100, the inside of the drainage pipe is filled with water, resulting in full-flow drainage. If a siphon drainage system is adopted as the drainage system 100 in this way, the liquid drainage becomes full-flow drainage, so it is possible to prevent solid matter from adhering to the inside of the pipe, and it is possible to use a small diameter pipe. Furthermore, in this example, since a siphon drainage system is adopted as the drainage system 100, the drainage pipes can be arranged without any slope. If the siphon drainage system is adopted as the drainage system 100 in this manner, the drainage pipes can be arranged without any slope, and the height of the space under the floor where the drainage pipes are arranged can be lowered. Furthermore, in this example, since a siphon drainage system is adopted as the drainage system 100, the extended distance from the drainage source (for example, various plumbing fixtures EW) to the vertical pipe VP (for example, from the outlet of the plumbing fixture EW to the siphon The horizontal length L) of the drain pipe 130 to the vertical pipe 130b can be increased (see FIG. 44), and as a result, the degree of freedom in the layout of the living room can be increased.

By the way, in the drainage system 100 that employs the siphon drainage system, assuming that a large amount of liquid is drained from the water appliance EW at once, a storage tank 10 is installed between the appliance drainage pipe 120 and the siphon drainage pipe 130. is provided. The storage tank 10 can temporarily store a large amount of water drained from the plumbing fixture EW at once until the promotion of drainage (generation of siphon force) starts.

[Exemplary Reservoir]
FIG. 28 is a perspective view showing the inflow side of the exemplary storage tank 10A from above. FIG. 29 is a perspective view showing the outflow side of the storage tank 10A in FIG. 28 from above. The storage tank 10A has an inlet A11 through which the liquid flows, and an outlet A12 through which the liquid flows out, and is capable of storing therein the liquid that has flowed in from the inlet A11.

FIG. 30 is a front view showing the storage tank 10A from the inflow side. Moreover, FIG. 31 is a rear view showing the storage tank 10A from the outflow side. As shown in FIG. 4, the storage tank 10A includes a bottom wall 11, a peripheral wall 12 that stands up against the bottom surface, and two partition walls 13 that stand up against the bottom surface. In this embodiment, the storage tank 10A includes a ceiling wall 14. The ceiling wall 14 is connected to the upper end of the peripheral wall 12. Thereby, a space partitioned by the bottom wall 11, the peripheral wall 12, and the top wall 14 is formed inside the storage tank 10A. Note that in the storage tank 10A, a vent hole H12 is formed in the peripheral wall 12. The vent H12 allows the internal space of the storage tank 10A to communicate with the outside world. This prevents the inside of the storage tank 10A from becoming negative pressure.

FIG. 32 is a plan view showing the storage tank 10A from above. FIG. 33 is a bottom view showing the storage tank 10A from below. As shown in FIG. 33, in the storage tank 10A, the peripheral wall 12 includes an inlet portion 12a in which an inlet A11 is formed, and an outlet opposite to the inlet portion 12a and in which an outlet A12 is formed. A portion 12b. In this example, the peripheral wall 12 includes an inlet portion 12a, an outlet portion 12b, an inlet-side adjacent portion 12c adjacent to the inlet portion 12a, an outlet-side adjacent portion 12d adjacent to the outlet portion 12b, and a side portion. 12e. Furthermore, in this example, the peripheral wall 12 includes an inflow side corner portion 12f that connects the inflow side adjacent portion 12c and the side surface portion 12e, and an outflow side corner portion 12g that connects the side surface portion 12e and the outflow side adjacent portion 12d. There is.

As shown in FIG. 33, in the storage tank 10A, the bottom wall 11 is partitioned by a peripheral wall 12. As shown in FIG. 32, like the bottom wall 11, the top wall 14 is also partitioned by the peripheral wall 12. In addition, in this example, the ceiling wall 14 has two openings A13. The opening A13 allows the internal space of the storage tank 10A to communicate with the outside world. Further, in this example, the peripheral wall 12 has recessed portions 12h at respective positions of an inflow side corner portion 12f and an outflow side corner portion 12g on the side of the ceiling wall 14.

FIG. 34 is a sectional view taken along line AA in FIG. 30. FIG. 34 is the maximum cross section of the storage tank 10A. FIG. 35 is a sectional view taken along line BB in FIG. 30. FIG. 35 is a cross section passing through the center Oa of the inlet A11. FIG. 36 is a sectional view taken along the line CC in FIG. 31. FIG. 36 is a cross section passing through the center Ob of the outlet A2. As shown in FIG. 34, etc., the storage tank 10A is arranged in a liquid passage region R1 extending between an inlet A11 and an outlet A12, and at positions on both sides of the liquid passage region R1. A liquid retention region R2 is provided. 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 A12. The liquid passage region R1 can also be curved or extend in a zigzag shape in plan view. In this example, the liquid passage region R1 extends linearly, as shown in FIGS. 34 to 36. Thereby, the liquid passage region R1 becomes the shortest path as a liquid passage connecting the inlet A11 and the outlet A12.

On the other hand, as shown in FIG. 34 and the like, the two liquid retention regions R2 are located at respective positions on both sides of the liquid passage region R1, and are arranged adjacent to the liquid passage region R1. The two liquid retention regions R2 can each retain the liquid that has flowed in from the inlet A11.

Further, as shown in FIG. 34 and the like, in the storage tank 10A, the inlet portion 12a of the peripheral wall 12 is recessed toward the outlet side than the inlet side adjacent portion 12c adjacent to the inlet portion 12a. In this example, as shown in FIG. 34 etc., 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 12i.

Furthermore, in the storage tank 10A, the outlet portion 12b of the peripheral wall 12 projects further toward the outlet side than the adjacent outlet portion 12d. In this example, as shown in FIG. 34 etc., the outflow side adjacent portion 12d of the peripheral wall 12 is connected to the outflow port portion 12b.

FIG. 37 is a right side view showing the right side of the storage tank 10A. FIG. 38 is a left side view showing the left side of the storage tank 10A. As shown in FIG. 37 and the like, in the storage tank 10A, the inlet A11 is located below the peripheral wall 12 excluding the inlet portion 12a and the outlet portion 12b of the peripheral wall 12. Like the inlet A11, the outlet A12 is also located below the peripheral wall 12 excluding the inlet portion 12a and the outlet portion 12b of the peripheral wall 12.

FIG. 39 is a sectional view taken along line DD in FIG. 32. FIG. 39 is a cross section that divides the storage tank 10A into two. FIG. 39 shows the internal structure of the liquid passage region R1 and the liquid retention region R2 inside the storage tank 10A. FIG. 40 is a sectional view taken along line EE in FIG. 32. FIG. 40 shows the internal structure of the liquid retention region R2 inside the storage tank 10A. As shown in FIG. 39, in the storage tank 10A, the inflow port A11 is constituted by an inflow path P1 formed in the inflow port portion 12a of the peripheral wall 12. Further, the outflow port A12 is constituted by an outflow path P2 formed in the outflow port portion 12b of the peripheral wall 12. In the storage tank 10A, the liquid passage region R1 includes 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 of the bottom wall 11, and the flow area of the peripheral wall 12. and an inner surface 12fb of the outlet portion 12b. In the storage tank 10A, as shown in FIG. 39, the bottom surface F1 of the liquid passage region R1 is configured as a flat surface. In this example, the bottom surface F1 of the liquid passage region R1 is the lowest end of the inner surface 12fa of the inlet portion 12a of the peripheral wall 12 (the lowermost extension of the inlet portion 12a extending in the liquid flow direction). the lowest end (the lowest extending end extending in the liquid flow direction of the lower portion 11a) 12fa1 of the inner surface 11fa of the lower portion 11a of the bottom wall 11; Among the inner surfaces 12fb of the outlet portion 12b of the peripheral wall 12, the lowermost end (the lowest extending end extending in the liquid flow direction of the outlet portion 12b) of the inner surface 12fb is the lowest end 12fb1. .

In addition, in FIG. 40, the code|symbol 12fp1 is the lowest end of the inflow path P1 (the lowest extending end of the inflow path P1 extending in the liquid flow direction). Further, reference numeral 12fp2 is the lowest end of the outflow path P2 formed in the outflow port portion 12b (the lowest extending end of the outflow path P2 extending in the liquid flow direction). As shown in FIG. 40 etc., in the storage tank 10A, the lowest end (bottom surface) 11fa1 of the lower part 11a of the bottom wall 11 is inclined downward toward the downstream, and the outflow port A12 is lower than the inflow port A11. It is also located in a lower position.

On the other hand, as shown in FIG. 34 etc., the two liquid retention regions R2 are, in plan view, the peripheral wall 12 excluding the inlet portion 12a and the outlet portion 12b of the peripheral wall 12, and the liquid passage region R1. It is divided into . Specifically, in plan view, the two liquid retention regions R2 include 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, and an inner surface 12fc of the inflow side adjacent portion 12c. It is divided into an inner surface 12ff of the 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 passage region R1. Furthermore, as shown in FIG. 41, etc., the two liquid retention regions R2 are located at the inner surface (bottom surface) 11fb of the upper portion 11b of the bottom wall 11 and the inner surface (top surface) of the top wall 14, respectively. ) 14f. In addition, in the storage tank 10A, as shown in FIG. 40, the bottom surface F2 of the liquid retention region R2 is configured as a flat surface. In this 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 the FF cross section of FIG. 32 from the inflow side. The FF cross section is a cross section of a plane including the central axes of the two openings A13 of the ceiling wall 14. As shown in FIG. 41, a groove G is arranged in the liquid passage region R1. The groove G is arranged between the inlet A11 and the outlet A12. As shown in FIG. 41 and the like, in the storage tank 10A, a part of the groove G is formed by the inner surface 11fa of the lower portion 11a of the bottom wall 11. In the storage tank 10A, the lower portion 11a of the bottom wall 11 is recessed with respect to the 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 composed of the deepest surface 11fa1 and two side surfaces 11fa2. The deepest surface 11fa1 is the deepest surface (lowest end) of the bottom wall 11. The deepest surface 11fa1 is connected to the inner surface 11fb of the upper portion 11b of the bottom wall 11 via the side surface 11fa2. The deepest surface 11fa1 is connected to the side surface 11fa2 by a curved surface when viewed in the extending direction of the liquid passage region R1. The side surface 11fa2 is connected to the inner surface 11fb of the upper portion 11b by a curved surface when viewed in the extending direction of the liquid passage region R1.

Further, in the storage tank 10A, a part of the groove G is formed by the inner surface 12fb of the outlet portion 12b of the peripheral wall 12. As shown in FIG. 37 etc., in the storage tank 10A, the outflow port portion 12b of the peripheral wall 12 extends downward such that the outflow port A2 is located below the outflow side adjacent portion 12d. . As shown in FIG. 41, in this example, the inner surface 12fb of the outlet portion 12b of the peripheral wall 12 includes the deepest surface 12fb1 and two side surfaces 11fb2. The deepest surface 12fb1 is connected to the side surface 12fb2 by a curved surface when viewed in the extending direction of the liquid passage region R1. The side surface 12fb2 forms the same plane as the side surface 11fa2 of the lower portion 11a of the bottom wall 11. The deepest surface 12fb1 is the deepest surface (lowest end) of the inner surface 12fb of the outlet portion 12b of the peripheral wall 12. The deepest surface 12fb1 forms the same plane as the deepest surface 11fa1 of the lower portion 11a of the bottom wall 11. Further, the deepest surface 12fb1 is connected to the inner surface 13f1 of the partition wall 13 via the side surface 12fb2. The side surface 12fb2 forms the same plane as the inner surface 13f1 of the partition wall 13.

Further, as shown in FIG. 35 and the like, in the storage tank 10A, a part of the groove G is formed by the inner surface 11fa of the inlet portion 12a of the peripheral wall 12. As shown in FIG. 37 and the like, in the storage tank 10A, the inlet portion 12a of the peripheral wall 12 extends downward such that the inlet A11 is located at a lower position than the inlet-side adjacent portion 12c. . As shown in FIG. 35, in this example, the inner surface 12fa of the inlet portion 12a of the peripheral wall 12 is composed of the deepest surface 12fa1 and two side surfaces 11fa2. The deepest surface 12fa1 is connected to the side surface 12fa2 by a curved surface when viewed in the extending direction of the liquid passage region R1. The side surface 12fa2 forms the same plane as the side surface 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 (lowest end) of the inner surface 12fa of the inlet portion 12a of the peripheral wall 12. The deepest surface 12fa1 forms the same plane as the deepest surface 11fa1 of the lower portion 11a of the bottom wall 11. Moreover, as shown in FIG. 35 etc., the deepest surface 12fa1 is connected to the inner surface 12fi of the inflow side corner portion 12i via the side surface 12fa2.

As shown in FIG. 36 etc., the two partition walls 13 extend toward the outlet A12. In the storage tank 10A, it extends toward the outlet A12 so as to secure the outlet A12. Here, "securing the outflow port A12" means "not closing the opening of the outflow port A12."

Further, as shown in FIG. 39, in the storage tank 10A, the partition wall 13 has a height H13 that allows the liquid to overflow from the partition wall 13. In this example, the height H13 of the partition wall 13 is the height of the liquid passage region R1 from the bottom surface F1. Thereby, the liquid passing through the liquid passage region R1 can flow into the liquid retention region R2 when the water head of the liquid reaches a certain level or more.

Moreover, as shown in FIG. 39 etc., in the storage tank 10A, the height H13 of the partition wall 13 increases toward the outlet A12. As shown in FIG. 39 and the like, in this example, the top surface 13f2 of the partition wall 13 is a curved surface whose cross-sectional shape in side view is a convex curve toward the outflow side. As shown in FIG. 39, in this example, the curve of the top surface 13f2 of the partition wall 13 has a radius of curvature R13.

In the storage tank 10A, the partition wall 13 is configured as a part of the outlet portion 12b of the peripheral wall 12. The partition wall 13 stands up from a position adjacent to the groove G. FIG. 42 is a perspective view of the GG cross section in FIG. 32 from the inflow side. The GG cross section is a cross section of a plane including the boundary between the peripheral wall 12 and the bottom wall 11. As shown in FIG. 42 and the like, in the storage tank 10A, the inner surface 13f1 of the partition wall 13 is connected to the side surface 12fb2 of the inner surface 12fb of the inner surface 12fb of the outlet portion 12b of the peripheral wall 12, and the inner surface 13f1 of the partition wall 13 is connected to the side surface 12fb2 of the inner surface 12fb. They form the same plane. In addition, in the storage 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 connected to the top surface 13f2 of the partition wall 13, and the top surface of the partition wall 13 is connected to the top surface 13f2 of the partition wall 13. It forms the same surface as 13f2. Here, the term "same surface" refers to a "smoothly connected continuous surface" and includes both "flat" and "curved" surfaces.

FIG. 43 is a sectional view taken along line GG in FIG. 32. As shown in FIG. 43, in the storage tank 10A, the end edge 13e of the top surface 13f2 of the partition wall 13 is a curved surface that is convex toward the inside of the storage tank 10A.

Further, as shown in FIG. 40, in the storage tank 10A, the inner surface 12fd of the outflow side adjacent portion 12d of the peripheral wall 12 is a curved surface whose cross-sectional shape in side view is a convex curve toward the outflow side. As shown in FIG. 40, in this embodiment, the inner surface 13fd of the outflow side adjacent portion 13d has a curve on the bottom wall 11 side having a large radius of curvature Rd11. In this example, the radius of curvature Rd11 is the same as the radius of curvature R13 that forms the curve of the top surface 13f2 of the partition wall 13. On the other hand, the curve on the top wall 14 side has a smaller radius of curvature Rd14 than the curve on the bottom wall 11 side.

As a result of extensive testing and research, the inventor of the present application has found that in a storage tank used in a siphon drainage system, if the water head of the liquid near the outlet of the storage tank is quickly raised, a large amount of liquid flows out quickly and smoothly. It has been found that the time required for the generation of siphon force can be shortened. The storage tank 10A according to the present embodiment was created with the focus on the fact that if the water head of the liquid near the outlet A2 is quickly raised, a large amount of liquid can be quickly and smoothly flowed out.

As shown in FIG. 39 etc., the storage tank 10A has an inlet port A11 through which the liquid flows in, and an outlet port A12 through which the liquid flows out, and is capable of storing the liquid that has flowed in from the inlet port A11 inside. It is a storage tank. The storage tank 10A includes a peripheral wall 12 that stands up against the bottom surface, and two partition walls 13 that stand up against the bottom surface. , an outlet portion 12b facing the inlet portion 12a and in which an outlet A12 is formed. The two partition walls 13 extend toward the outlet A12.

According to the storage tank 10A, by providing the partition wall 13, it is possible to quickly increase the water head of the liquid near the outlet A12 while ensuring the flow of the liquid to the outlet A12, as shown by the arrow D1. can. Even if the liquid (drainage) flowing in from the inlet A11 is small, according to the storage tank 10A, the water head of the liquid near the outflow port A12 can be reduced by providing the partition wall 13 in the storage tank 10A. can be increased quickly, and as a result, siphon activation is more likely to occur. For example, even if a large amount of liquid flows in from the inlet A11, only a small amount of liquid reaches the vicinity of the outlet A12 in the first stage. In this way, even if the liquid near the outflow port A12 is small, according to the storage tank 10A, the water head of the liquid near the outflow port A12 can be quickly increased by providing the partition wall 13 in the storage tank 10A. As a result, siphon activation becomes more likely to occur. Therefore, according to the storage tank 10A according to the present embodiment, a large amount of liquid can be quickly and smoothly drained. In particular, if the storage tank 10A is used for a siphon drainage system like the storage tank 10A, the time until siphon force is generated can be shortened even when a large amount of liquid is drained.

Further, as shown in FIG. 39, in the storage tank 10A, the partition wall 13 has a height H13 that allows the liquid to overflow from the partition wall 13. In this case, when the water head of the liquid near the outflow port A12 exceeds a certain level, the liquid near the outflow port A12 can be released from the partition wall 13, as shown by 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 outlet A2, allowing for faster and smoother drainage.

Moreover, as shown in FIG. 39, in the storage tank 10A, the height H13 of the partition wall 13 increases toward the outlet A12. In this case, while increasing the water head of the liquid near the outlet A12, the amount of liquid released from the partition wall 13 can be increased as the distance from the outlet A12 increases. Therefore, according to the storage tank 10A, it is possible to achieve a balance between shortening the time until siphon force is generated and smooth drainage.

Further, as shown in FIG. 39, in the storage tank 10A, the outflow port A12 is provided at a lower position than the inflow port A11. In this case, faster and smoother drainage is possible. Therefore, according to the storage tank 10A, it is possible to further shorten the time until the siphon force is generated.

Further, as shown in FIG. 42 and the like, in the storage tank 10A, the partition wall 13 is configured as a part of the outlet portion 12b of the peripheral wall 12, and the partition wall 13 is configured as a part of the outlet portion 12b of the peripheral wall 12. The inner surface 12fd of the side adjacent portion 12d is connected to the top surface 13f2 of the partition wall 13 and forms the same surface as the top surface 13f2 of the partition wall 13. In this case, as shown by arrow D2, the liquid released from the partition wall 13 can be further released 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 outlet A12, allowing for faster and smoother drainage.

Further, as shown in FIG. 43, in the storage tank 10A, the end edge 13e of the top surface 13f2 of the partition wall 13 is a curved surface that is convex toward the inside of the storage tank 10A. In this case, as shown by arrow D2, the liquid near the outflow port A12 can be efficiently and smoothly released 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 storage tank 10A, it is possible to efficiently perform quick and smooth drainage.

Further, as shown in FIG. 40 and the like, in the storage tank 10A, the inner surface 12fd of the outflow side adjacent portion 12d of the peripheral wall 12 is a curved surface whose cross-sectional shape in side view is a convex curve toward the outflow side. In this case, as shown by arrow D3, the liquid released from the partition wall 13 is further moved along the inner surface 12fd of the outflow side adjacent portion 12d of the peripheral wall 12 while causing convection (circulation) in the vertical direction (vertical direction). You can escape. Therefore, according to the storage tank 10A, even faster and smoother drainage is possible.

In particular, as shown in FIG. 34 etc., the storage tanks 10A are arranged in a liquid passage region R1 extending between an inlet A11 and an outlet A12, and at respective positions on both sides of the liquid passage region R1. A liquid retention region R2 is provided. In this case, as shown by arrows D1 and D2, while the liquid is flowing into the liquid passage region R1, the remainder of the liquid can be retained in the liquid retention region R2. Therefore, according to the storage tank 10A, more liquid can be stored in the liquid retention area R2 while suppressing an increase in the length of the liquid passage area R1 in the extending direction. Therefore, according to the storage tank 10A, the flow of the liquid is not easily obstructed near the outlet A12, and it becomes possible to rapidly and smoothly drain more liquid by a certain amount continuously. Additionally, in this case, the liquid flowing from the liquid passage region R1 can be caused to convect (circulate) between the liquid passage region R1 and the liquid retention region R2, as shown by arrow D4. Therefore, according to the storage tank 10A, more liquid can be drained quickly and smoothly while suppressing an increase in the length of the liquid passage region R1 in the extending direction. Further, in this case, since the liquid flowing from the liquid passage region R1 convects between the liquid passage region R1 and the liquid retention region R2, it becomes difficult for dirt to adhere to the inside of the storage tank 10A. Thereby, the number of operations required to clean the storage tank 10A can be reduced.

Further, according to the storage tank 10A, the liquid retention areas R2 are arranged at respective positions on both sides of the liquid passage area R1, so in order to secure the volume of the liquid retention area R2, for example, It is only necessary to increase the dimension (area) in the direction in which the liquid retention region R2 extends, and it is possible to avoid increasing the height of the liquid retention region R2 and, by extension, the height of the storage tank 10A. Therefore, like the storage tank 10A, for example, in the storage tank 10A, the direction in which the liquid retention area R2 extends on both sides of the liquid passage area R1 is the horizontal direction, and the direction in which the peripheral wall 12 is erected is the vertical direction. If installed in the floor slab FS, etc., a large amount of liquid can be quickly and smoothly drained without ensuring a large height of the underfloor space S. Here, the "height of the storage tank 10A" is the vertical height (dimension) of the storage tank 10A. In other words, it is the height (dimension) of the peripheral wall 12 of the storage tank 10A in the upright direction.

From the above viewpoint, more specifically, for example, in the storage tank 10A, the height of the storage tank 10A can be made lower than the width of the storage tank 10A, and preferably, the height of the storage tank 10A is lower than the width of the storage tank 10A. The height of the storage tank 10A is 1/2 or less of the width of the storage tank 10A, and more preferably, the height of the storage tank 10A is 1/3 or less of the width of the storage tank 10A. Here, the "width of the storage tank 10A" refers to two of the peripheral walls 12 of the storage tank 10A facing each other in a direction perpendicular to the height direction of the storage tank 10A and the extending direction of the liquid passage region R1. This is the maximum width between the two peripheral walls 12. That is, referring to FIG. 34, this is the width (dimension) between the outer surfaces of the two peripheral walls (side walls) 12e in the storage tank 1A arranged in the vertical direction of the drawing.

Further, as shown in FIG. 34 and the like, in the storage tank 10A, the inlet portion 12a of the peripheral wall 12 is recessed toward the outflow side than the inlet-side adjacent portion 12c of the peripheral wall 12 adjacent to the inlet portion 12a. In this case, the liquid flowing in the storage tank 10A is likely to return to the outflow direction of the liquid. Therefore, water can be drained more quickly and smoothly. In particular, in the storage tank 10A, the liquid retention region R2 is arranged at a position adjacent to the liquid passage region R1, so that the liquid flowing from the liquid passage region R1 easily returns to the liquid passage region R1. That is, in the storage tank 10A, it is possible to efficiently cause convection between the liquid passage region R1 and the liquid retention region R2. Therefore, according to the storage tank 10A, much liquid can be drained more quickly and smoothly through the liquid passage region R1. In addition, in the storage tank 10A, it becomes more difficult for dirt to adhere to the inside of the storage tank 10A. Thereby, the number of operations required to clean the storage tank 10A can be further reduced.

Further, as shown in FIG. 42 and the like, the partition wall 13 stands up from a position adjacent to the groove G. In the storage tank 10A, the groove G is arranged in the liquid passage region R1. In this case, even a small amount of liquid can be quickly collected by the groove G. This allows for faster and smoother drainage. In the storage tank 10A, the partition wall 13 stands up from a position adjacent to the groove G disposed in the liquid passage region R1. In this case, even a small amount of liquid can be quickly collected in the liquid passage region R1. Therefore, according to the storage tank 10A, a large amount of liquid can be drained more quickly and smoothly through the liquid passage region R1. Particularly in this case, since the partition wall 13 stands up from a position adjacent to the groove G disposed in the liquid passage region R1, the water head of the liquid near the outlet A12 can be raised more quickly. Therefore, according to the storage tank 10A, a large amount of liquid can be drained even more quickly and smoothly through the liquid passage region R1.

Further, as shown in FIG. 34 and the like, in the storage tank 10A, among the inner surfaces 12f of the peripheral wall 12, the inner surface 12f of the peripheral wall 12 forming a corner inside the storage tank 10A in plan view has a curved outline shape in plan view. It is a curved surface consisting of In the storage tank 10A, for example, the inner surface 12fi of the inflow corner portion 12i, the inner surface 12fj of the inflow corner portion 12j, the inner surface 12ff of the inflow corner portion 12f, and the inner surface 12fg of the outflow corner portion 12g each have a contour in plan view. The shape is a curved surface. In this case, the liquid flowing from the liquid passage region R1 can be more efficiently convected between the liquid passage region R1 and the liquid retention region R2. Therefore, according to the storage tank 10A, a large amount of liquid can be drained more smoothly, and the number of operations required for cleaning the storage tank 10A can be further reduced.

By the way, as a result of extensive testing and research, the inventor of the present application has found that in a storage tank used in a siphon drainage system, even when liquid is collected near the outlet of the storage tank, a large amount of liquid can flow out quickly and smoothly. It has been found that the time required for the generation of siphon force can be shortened. The storage tank 10A according to the present embodiment was created with the focus on the fact that when liquid is collected near the outlet A12, a large amount of liquid can be quickly and smoothly flowed out.

In the storage tank 10A, the outlet portion 12b of the peripheral wall 12 protrudes toward the outflow side from the outlet-side adjacent portion 12d of the peripheral wall 12 adjacent to the outlet portion 12b of the peripheral wall 12. In this case, the structure becomes such that the liquid can easily collect near the outlet A12. Therefore, according to the storage tank 10A, a large amount of liquid can be quickly and smoothly drained. In particular, if the storage tank 10A is used for a siphon drainage system like the storage tank 10A, the time until siphon force is generated can be shortened even when a large amount of liquid is drained.

FIG. 44 is a sectional view taken along line HH in FIG. 32. The HH cross section is a cross section of a plane including the upper end of the outflow side adjacent portion 12d of the peripheral wall 12. As shown in FIG. 44, in the storage tank 10A, the inner surface 12fb of the outlet portion 12b of the peripheral wall 12 has a racetrack cross-sectional shape when viewed in the liquid flow direction. In this case, the structure becomes such that the liquid is more easily collected near the outlet A12. In the storage tank 10A, the racetrack shape is a flat shape extending in the lateral direction (horizontal direction). Exemplary racetrack shapes include a monocentric racetrack shape with one center O1 on one side, a bicentric racetrack shape with two centers O1 and O2 on one side, An example is a race track shape having three centers on one side, ie, three centers O1, O2, and O3 arranged on one side. Further, as a race track shape having a tricentric circle on one side, there is a race track shape having a regular tricentric circle on one side in which three centers O1 to O3 are aligned, and one center O2 between the two centers O1 and O3 is arranged on the outside. Examples include a racetrack shape with an acute tricentric circle on one side, and a racetrack shape with an obtuse tricentric circle in which one center O2 between the two centers O1 and O3 is located inside. In this embodiment, the cross-sectional shape of the outlet A2 is similar to a racetrack shape with an acute tricentric circle on one side. In this embodiment, the two centers O1 and O2 sandwiching one center O2 are not aligned, and the line between A and B is a straight line. The other distances are curved lines.

Note that in terms of easy collection of liquid, it is optimal that the inner surface 12fb of the outlet portion 12b of the peripheral wall 12 has a racetrack cross-sectional shape when viewed in the liquid flow direction. On the other hand, the inner surface 12fb of the outlet portion 12b of the peripheral wall 12 may have a circular or elliptical cross-sectional shape when viewed in the liquid flow direction. When the inner surface 12fb of the outlet portion 12b of the peripheral wall 12 is circular or elliptical when viewed in the liquid flow direction, it becomes easier to flow a large amount of liquid. However, the circular and elliptical cross-sectional shapes are cross-sectional shapes when specialized for large flow rates. For this reason, especially when it is desired to flow liquid continuously like in the storage tank 10A, it is preferable to have a racetrack shape as illustrated in FIG. 45 and the like.

In particular, in the storage tank 10A, as shown in FIG. 34 etc., the inner surface 12fb of the outlet portion 12b of the peripheral wall 12 includes a curved surface that tapers toward the outlet A12. In this case, the structure becomes such that the liquid is more easily collected near the outlet A12.

By the way, as shown in FIG. 43, in the storage tank 10A, the bottom surface F2 of the liquid retention area R2 is inclined downward toward the liquid passage area R1 when viewed in the extending direction of the liquid passage area R1. This is a plane connected to the bottom surface F1 of R1. In this case, the liquid in the liquid retention area R2 easily flows into the liquid passage area R1 along the bottom surface F2 of the liquid retention area R2. Therefore, according to the storage tank 10A, much liquid can be drained more smoothly through the liquid passage region R1. In the storage tank 10A, the bottom surface F2 of the liquid retention region R2 is inclined at an angle θ11b with respect to the horizontal axis (in FIG. 43, it is indicated by a straight line Oy that appears when the horizontal plane is viewed in the extending direction of the liquid passage region R1). ing. The angle θ11b can be set as appropriate depending on the content, size, etc. of the storage tank 10. The angle θ11b can be, for example, an angle of 0.5° to 5°. When the angle θ11b is less than 0.5°, the effect in forming convection of drainage becomes weak. Furthermore, when the angle θ11b is 5° or more, the inclination becomes too steep, so if the liquid does not completely enter the outlet A12 and overflows, the overflowing liquid will not flow properly to the liquid retention region R2.

By the way, in the storage tank 10A, as shown in FIG. 43, the bottom surfaces F2 of the two liquid retention regions 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 into a V-groove whose groove bottom is the directly connected portion of the two bottom surfaces F2. Alternatively, by connecting the lower ends of the bottom surfaces F2 of the two liquid retention regions R2 via a plane, the liquid passage region R1 can be formed into a trapezoidal V-groove with the plane as the groove bottom. The bottom surface F1 of these liquid passage regions R1 is located at the same height as the bottom surface F2 of the two liquid retention regions R2.

On the other hand, as shown in FIG. 39 and the like, in the storage tank 10A, the bottom surface F1 of the liquid passage region R1 is arranged at a lower position 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 storage tank 10A, a large amount of liquid can be drained more smoothly through the liquid passage region R1. In the storage tank 10A, a groove G is arranged in the liquid passage region R1. The lowest end 12fP2 of the outflow port A12 is arranged at a position lower than the bottom surface F2 of the liquid retention region R2.

Further, as shown in FIGS. 39 to 43, in the storage tank 10A, at least the inner surface 12f of the peripheral wall 12 in the liquid retention region R2 has a cross-sectional shape when viewed in the extending direction of the peripheral wall 12, which is directed outward from the inside of the storage tank 1A. It is a curved surface consisting of convex curves. In this case, the liquid flowing from the liquid passage region R1 further escapes along the inner surface 12fd of the outflow side adjacent portion 12d of the peripheral wall 12 while vertical (vertical) convection (circulation) occurs. Therefore, according to the present embodiment, convection between the liquid passage 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 drained more smoothly, and the number of operations required for cleaning the storage tank 10A can be further reduced.

In addition, in the storage tank 10A, as shown in FIGS. 30 and 31, the liquid passage region R1 has an outflow port A12 at least as far as the inflow port A11 when viewed in the liquid distribution direction (as seen in the extending direction of the liquid passage region R1). They are arranged so that they overlap in a straight line with some of them.

Referring to FIG. 30, a specific example of alignment of the inlet A11 and the outlet A12 includes a method of combining any of the following (1) to (3).
(1) The center Oa of the inlet A11 and the center Ob of the outlet 1b are aligned on the same vertical line Oz when viewed in the extending direction of the liquid passage region R1.
(2) The size of the inner diameter of the inlet A11 (the size of the radius ra of the inlet A11) and the size of the inner diameter of the outlet A12 (the size of the radius rb of the outlet A12) are adjusted.
(3) Adjust the interval ΔZ in the vertical direction (direction of the vertical line Oz) between the center Oa of the inlet A11 and the center Ob of the outlet A12.

In the storage tank 10A, by using all methods (1) to (3), the outflow port A12 overlaps in a straight line with at least a portion of the inflow port A11 (as viewed in the extending direction of the liquid passage region R). They are arranged like this. In particular, as shown in FIG. 30, in (2) in the storage tank 10A, the inner diameter of the outflow port A12 is set to be smaller than the inner diameter of the inflow port A11. As a result, the amount of liquid flowing out from the outlet A12 becomes smaller than the amount of liquid flowing in from the inlet A11. In addition, in the storage tank 10A, as shown in FIG. The vertical distance ΔZ is adjusted so that the inner upper ends overlap.

[Other exemplary reservoirs]
FIG. 45 is a perspective view showing the inflow side of another exemplary storage 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 arranged on both sides of the liquid passage region R1, and makes the external shape of the storage tank 10B into a butterfly shape (H shape). It's shaping. In the storage tank 10B, the partition wall 13 is a wall different from the peripheral wall 12.

What has been described above describes exemplary embodiments of the invention, and various modifications may be made without departing from the scope of the claims. For example, the storage tank 10 can be integrally manufactured by injection molding using resin. In particular, the storage tank 10A can be blow molded. However, the method for manufacturing the storage tank 10 is not limited to injection molding. The storage tank 10 may or may not have a ceiling wall 14 formed at the upper end of the peripheral wall 12. Further, the configuration of the drain pipe structure and drainage system 100 according to the present invention is not limited to the above configuration. For example, the appliance drain pipe 120 and the siphon drain pipe 130 have been described as drain pipes in which the upstream part (horizontal pipe) and the downstream part (vertical pipe) are integrated, but the upstream part (horizontal pipe) and the downstream portion (vertical pipe) are separate drain pipes, and these drain pipes are connected to each other to form the appliance drain pipe 120 or the siphon drain pipe 130. Further, various configurations adopted in the storage tank 10A or the storage tank 10B described above can be replaced with each other as appropriate.

1: Silencer, 2: Ventilation pipe, 3: Tubular passage, 3t: Turning passage, A1: Inlet section, 31: Three-pronged branch passage, 31a: Inflow passage of three-pronged branch passage, 31b: Outflow passage on one side of three-pronged branch passage , 31be: End of one side outflow passage, 31c: Other side outflow passage of three-pronged branch passage, 31J: Branch, 32: Common wall, 33: (hollowed) groove, 4: Ventilation pipe passage, 10: Storage tank , 50: rod-shaped member, 51: closing member, 60: high-pressure cleaning hose, 61: high-pressure cleaning nozzle, 70: cleaning tool, 71: rod-shaped member, 72: brush (occluding member), 70A: linear cleaning tool, 71A: Straight rod-shaped member, 72A: Brush (occlusion member), 70B: Cleaning tool with a tendency to bend, 71A: Rod-shaped member with a tendency to bend, 72A: Brush (occlusion member), 101: Silencer unit, 110: Communication part, 120: Inflow pipe, 130: Outflow pipe (siphon drain pipe), 140: Outflow pipe side piping part, 150: Storage tank side piping part, 151: Insertion restriction part, 160: Exhaust side ventilation pipe, A1: Inlet Part, A2: Outlet part, A3: Inlet part, M1: Lower member, M2: Upper member

Claims (10)

It has a tubular passage,
The tubular passage includes an inlet connected to a side of the sound source, an outlet connected to a side other than the sound source, and a three-pronged branch passage disposed on the side of the inlet,
The inflow passage of the three-pronged branch passage communicates with the inlet portion,
One side outflow passage of the three-pronged branch passage is closed at an end thereof,
A muffler for a drain pipe structure , wherein the other side outflow passage of the three-pronged branch passage communicates with the outlet portion. The muffler for a drain pipe structure according to claim 1, further comprising a vent pipe communicating with the outlet portion. The muffler for a drain pipe structure according to claim 1 or 2, wherein the tubular passage includes a small cross-sectional area portion whose cross-sectional area is smaller than the cross-sectional area of the inlet portion. The muffler for a drain pipe structure according to any one of claims 1 to 3, wherein the tubular passage includes a folded passage in at least a part of the three-pronged branch passage . The silencer for a drain pipe structure according to any one of claims 1 to 4, wherein the outlet portion is located above the inlet portion in the vertical direction . The tubular passage includes two extending passages that communicate via the folded passage;
The silencer for a drain pipe structure according to claim 4, wherein adjacent passage side walls of the two extending passages are common walls. The muffler for a drain pipe structure according to claim 6, wherein the common wall is hollowed out by a groove. The silencer for a drain pipe structure according to any one of claims 1 to 7, which is formed by a lower member and an upper member attached to the lower member. The muffler for a drain pipe structure according to claim 8, wherein the upper member is a flat member. The silencer for a drain pipe structure according to any one of claims 1 to 9, wherein the branch part of the three-pronged branch passage is T-shaped.

Images