JP7017465B2 - Storage tank - Google Patents

Description

The present invention relates to a storage tank.

As a drainage system for apartment houses, there is a siphon drainage system that uses the principle of siphon. According to the siphon drainage system, when draining water from a water supply device, the siphon force generated in the siphon drainage pipe can promote the drainage. On the other hand, in the siphon drainage system, assuming that a large amount of liquid is drained at one time, it is temporarily upstream from the siphon drainage pipe until the promotion of drainage (generation of siphon force) is started. It is necessary to provide a storage tank that can store liquid. As such a storage tank, a flow path reduction portion is provided between the outlet of the storage tank and the storage tank main body, and an inner wall surface that bulges outward is provided in a part of the flow path reduction portion. (See, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-108749

According to the above-mentioned storage tank, the liquid staying in the vicinity of the outlet is guided in a direction separated from the outlet along the inner wall surface of the flow path reduction portion. As a result, according to the above-mentioned storage tank, a large amount of liquid can be discharged quickly and smoothly without obstructing the flow of the liquid near the outlet.

However, even when the above-mentioned storage tank is used, for example, there is room for a large amount of liquid to flow out more quickly and smoothly.

An object of the present invention is to provide a novel storage tank capable of allowing a large amount of liquid to flow out quickly and smoothly.

The storage tank according to the present invention has been made by paying attention to the fact that when liquids are collected near the outlet, a large amount of liquid can be discharged quickly and smoothly.

The storage tank according to the present invention is a storage tank having an inflow port into which a liquid flows in and an outflow port from which the liquid flows out, and can store the liquid flowing in from the inflow port inside, and has a bottom surface. The peripheral wall is provided with an upright peripheral wall, and the peripheral wall includes an inlet portion in which the inlet is formed and an outlet portion facing the inlet portion and forming the outlet. , And the outlet portion of the peripheral wall protrudes toward the outflow side from the outflow side adjacent portion of the peripheral wall adjacent to the outlet portion of the peripheral wall.
According to the storage tank according to the present invention, the structure is such that the liquid can be easily collected in the vicinity of the outlet. Therefore, according to the storage tank according to the present invention, a large amount of liquid can be discharged quickly and smoothly.

In the storage tank according to the present invention, it is preferable that the inner surface of the peripheral wall adjacent to the outflow side has a curved surface shape whose cross-sectional shape in a side view is convex toward the outflow side.
In this case, the liquid in the storage tank can be further released along the inner surface of the outflow side adjacent portion of the peripheral wall while causing vertical (longitudinal) convection (circulation flow).

In the storage tank according to the present invention, it is preferable that the inner surface of the outlet portion of the peripheral wall has a race track shape in cross-sectional shape in terms of liquid flow direction.
In this case, it is easier to collect the liquid near the outlet.

In the storage tank according to the present invention, it is preferable that the inner surface of the outlet portion of the peripheral wall is a curved surface that tapers toward the outlet.
In this case, it is easier to collect the liquid near the outlet.

In the storage tank according to the present invention, it is preferable that the inflow port portion of the peripheral wall is recessed on the outflow side of the inflow side adjacent portion of the peripheral wall adjacent to the inflow port portion of the peripheral wall.
In this case, the liquid flowing in the storage tank tends to return to the outflow direction of the liquid. Therefore, drainage can be performed more quickly and smoothly.

In the storage tank according to the present invention, a liquid passage region extending between the inlet and the outlet and a liquid retention region arranged at each position on both sides of the liquid passage region. , Are preferably provided.
In this case, the rest of the liquid can be retained in the liquid retention region while flowing the liquid in the liquid passage region. Therefore, the flow of the liquid is less likely to be obstructed in the vicinity of the outlet, and quicker and smoother drainage becomes possible.

According to the present invention, it is possible to provide a novel storage tank capable of allowing a large amount of liquid to flow out quickly and smoothly.

It is a perspective view which shows the inflow side of the storage tank which concerns on 1st Embodiment of this invention from above. It is a perspective view which shows the outflow side of the storage tank of FIG. 1 from above. It is a front view which shows the inflow side of the storage tank of FIG. It is a back view which shows the outflow side of the storage tank of FIG. It is a top view which shows the storage tank of FIG. 1 from above. It is a bottom view which shows the storage tank of FIG. 1 from the bottom. FIG. 3 is a cross-sectional view taken along the line AA of FIG. FIG. 3 is a cross-sectional view taken along the line BB of FIG. FIG. 4 is a sectional view taken along the line CC of FIG. It is a right side view which shows the storage tank of FIG. 1 from the right side. It is a left side view which shows the storage tank of FIG. 1 from the left side. FIG. 5 is a sectional view taken along the line DD of FIG. FIG. 5 is a cross-sectional view taken along the line EE of FIG. It is a perspective view which shows the FF cross section of FIG. 5 from the inflow side. It is a perspective view which shows the GG cross section of FIG. 5 from the inflow side. FIG. 5 is a cross-sectional view taken along the line GG of FIG. FIG. 5 is a sectional view taken along the line HH of FIG. It is a schematic system diagram which shows an example of the drainage system to which the storage tank which concerns on this invention can apply with a partial cross section.

Hereinafter, the storage tank according to the embodiment of the present invention will be described in detail with reference to the drawings.

[Drainage system to which the storage tank according to the present invention can be applied]
FIG. 18 is a schematic system diagram showing an example of a drainage system to which the storage tank according to the present invention can be applied in a partial cross section. In FIG. 18, reference numeral 100 is an example of a drainage system to which the storage tank according to the embodiment of the present invention can be applied. In this example, the drainage system 100 is a siphon drainage system. The siphon drainage system is a drainage system that utilizes the siphon principle. According to the siphon drainage system, when draining water from a water supply device, the siphon force generated in the siphon drainage pipe can promote the drainage. The siphon drainage system is adopted, for example, as a drainage system for an apartment house in which one building is divided into a plurality of floors.

In this example, the drainage system 100 includes a water supply device 110, a device drainage pipe 120, a storage tank 1 according to an embodiment of the present invention, and a siphon drainage pipe 130.

The water supply device 110 is arranged on each floor of the building. Examples of the water supply device 110 include a bathtub (for example, a unit bath), a washbasin, and a sink. In this example, the water supply device 110 is a bathtub.

The equipment drainage pipe 120 connects the water supply equipment 110 and the storage tank 1. In this example, the fixture drainage pipe 120 is arranged in the underfloor space S. In this example, the underfloor space S is a space formed between the floor member 101 and the floor slab 102 of the building. Further, in this example, the equipment drainage pipe 120 is composed of an upstream side portion 120a extending in the vertical direction and a downstream side portion 120b extending in the horizontal direction. The upstream side portion 120a is connected to the water supply device 110. The downstream side portion 120b is connected to the upstream side portion 120a. In this example, the downstream side portion 120b is inclined downward from the upstream side portion 120a toward the downstream side. The downstream portion 120b is connected to the storage tank 1. In this example, the drain trap 121 is interposed in the middle of the downstream portion 120b.

The siphon drainage pipe 130 connects the storage tank 1 and the vertical pipe 150. The vertical pipe 150 is a drainage pipe that penetrates each floor of the building in the vertical direction. In this example, the siphon drainage pipe 130 is composed of a horizontal pulling pipe 130a arranged in the underfloor space S and a vertical pipe 130b penetrating the floor slab 102 and hanging downward. The horizontal pulling pipe 130a is connected to the storage tank 1. In this example, the horizontal pulling pipe 130a extends laterally so as to have a substantially horizontal slopelessness. Specifically, it is piped along the floor slab 102 on the floor where the water supply device 110 is installed, with a substantially horizontal slope. The vertical pipe 130b is connected to the horizontal pulling pipe 130a. The vertical pipe 130b is connected to the vertical pipe 150 via a pipe joint 140. Specifically, the vertical pipe 130b extends substantially vertically downward of the horizontal pulling pipe 130a to form a droop and generate a siphon force (eg, negative pressure).

In the drainage system 100 of this example, first, the liquid is discharged from the water supply device 110 from the height difference H1 between the outlet of the water supply device 110 and the horizontal pulling pipe 130a of the siphon drainage pipe 130. The liquid (for example, water) that has flowed out of the water supply device 110 flows into the storage tank 1 from the device drain pipe 120 due to the weight of the liquid (falling push pressure). The storage tank 1 stores a part of the liquid inside and causes the remaining liquid to flow out to the siphon drain pipe 130.

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

In the siphon drainage channel of this example, the height difference H1 between the outlet of the water supply device 110 and the horizontal pulling pipe 130a of the siphon drainage pipe 130 causes the drop pushing pressure of the drainage from the water supply device 110 to push the water supply device 110 and the device drainage pipe 120. The horizontal pull pipe 130a of the siphon drain pipe 130 is filled with water, and the drainage that reaches the vertical pipe 130b (hanging length H2) of the siphon drain pipe 130 due to the filling of the horizontal pull pipe 130a of the siphon drain pipe 130 is the vertical pipe. When the horizontal pulling pipe 130a of the siphon drain pipe 130 starts to fall and the horizontal pulling pipe 130a of the siphon drain pipe 130 becomes full, the siphon action occurs. Using this siphon action as drainage power, the high-speed flow generated in the siphon drainage channel causes drainage from the water supply device 110, and the drainage is smoothly and promptly discharged to the inside of the pipe joint 140.

In this example, since the siphon drainage system is adopted as the drainage system 100, the inside of the drainage pipe is filled with full-flow drainage. If the siphon drainage system is adopted as the drainage system 100 in this way, the drainage of the liquid becomes full-flow drainage, so that it is possible to prevent solid matter from adhering to the inside of the pipe and to use a small-diameter pipe. Further, in this example, since the siphon drainage system is adopted as the drainage system 100, the drainage pipe can be arranged without a gradient. If the siphon drainage system is adopted as the drainage system 100 in this way, the drainage pipes can be arranged without a gradient, so that the height of the space under the floor where the drainage pipes are arranged can be lowered. Further, in this example, since the siphon drainage system is adopted as the drainage system 100, the extension distance from the drainage source (for example, various water circulation equipment 110) to the vertical pipe 150 (for example, the siphon from the outlet of the water circulation equipment 110). The horizontal length L of the drainage pipe 130 up to the vertical pipe 130b) can be lengthened (see FIG. 17), and the degree of freedom in the layout of the living room can be increased.

By the way, in the drainage system 100 adopting the siphon drainage system, it is assumed that a large amount of liquid is drained from the water supply device 110 at one time, and the present invention is provided between the device drainage pipe 120 and the siphon drainage pipe 130. A storage tank 1 according to an embodiment is provided. The storage tank 1 can temporarily store a large amount of water drained from the water supply device 110 at one time until the promotion of drainage (generation of siphon force) is started.

[Reservoir according to an embodiment of the present invention]
FIG. 1 is a perspective view showing the inflow side of the storage tank 1A according to the first embodiment of the present invention from above. FIG. 2 is a perspective view showing the outflow side of the storage tank 1A of FIG. 1 from above. The storage tank 1A has an inflow port A1 into which the liquid flows in and an outflow port A2 in which the liquid flows out, and the liquid flowing in from the inflow port A1 can be stored inside.

FIG. 3 is a front view showing the storage tank 1A from the inflow side. Further, FIG. 4 is a rear view showing the storage tank 1A from the outflow side. As shown in FIG. 4, the storage tank 1A 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 the present embodiment, the storage tank 1A includes a top wall 14. The top wall 14 is connected to the upper end of the peripheral wall 12. As a result, in the present embodiment, a space partitioned by the bottom wall 11, the peripheral wall 12, and the top wall 14 is formed inside the storage tank 1A. In this embodiment, the peripheral wall 12 is formed with a vent H12. The vent H12 allows the internal space of the storage tank 1A to be communicated to the outside world. This prevents the inside of the storage tank 1A from becoming a negative pressure.

FIG. 5 is a plan view showing the storage tank 1A from above. FIG. 6 is a bottom view showing the storage tank 1A from below. As shown in FIG. 6, in the storage tank 1A, the peripheral wall 12 faces the inflow port portion 12a in which the inflow port A1 is formed and the inflow port portion 12a, and the outflow port A2 is formed. A portion 12b and the like. In the present embodiment, the peripheral wall 12 has an inflow port portion 12a, an outflow port portion 12b, an inflow side adjacent portion 12c adjacent to the inflow port portion 12a, an outflow side adjacent portion 12d adjacent to the outflow port portion 12b, and a side surface thereof. It comprises a portion 12e and. Further, in the present embodiment, the peripheral wall 12 includes an inflow side corner portion 12f connecting the inflow side adjacent portion 12c and the side surface portion 12e, and an outflow side corner portion 12g connecting the side surface portion 12e and the outflow side adjacent portion 12d. ing.

As shown in FIG. 6, in the storage tank 1A, the bottom wall 11 is partitioned by the peripheral wall 12. As shown in FIG. 5, the top wall 14 is also partitioned by the peripheral wall 12 like the bottom wall 11. In this embodiment, the top wall 14 has two openings A3. The opening A3 allows the internal space of the storage tank 1A to be communicated to the outside world. Further, in the present embodiment, the peripheral wall 12 has a recessed portion 12h at each position of the inflow side corner portion 12f and the outflow side corner portion 12g on the side of the top wall 14.

FIG. 7 is a cross-sectional view taken along the line AA of FIG. FIG. 7 is a maximum cross section of the storage tank 1A. FIG. 8 is a cross-sectional view taken along the line BB of FIG. FIG. 8 is a cross section passing through the center Oa of the inflow port A1. FIG. 9 is a sectional view taken along the line CC of FIG. FIG. 9 is a cross section passing through the center Ob of the outlet A2. As shown in FIG. 7 and the like, the storage tank 1A is arranged at each position on both sides of the liquid passage region R1 extending between the inlet A1 and the outlet A2 and the liquid passage region R1. The liquid retention region R2 is provided. In the storage tank 1A, the liquid passage region R1 connects the inlet A1 and the outlet A2, and guides the liquid flowing in from the inlet A1 to the outlet A2. The liquid passage region R1 can be curved in a plan view or extend in a zigzag shape. In the present embodiment, the liquid passage region R1 extends linearly as shown in FIGS. 7 to 9. As a result, the liquid passage region R1 becomes the shortest route as a liquid passage connecting the inlet A1 and the outlet A2.

On the other hand, as shown in FIG. 7 and the like, the two liquid retention regions R2 are arranged at positions on both sides of the liquid passage region R1 and adjacent to the liquid passage region R1. Each of the two liquid retention regions R2 can retain the liquid flowing in from the inflow port A1.

Further, as shown in FIG. 7 and the like, in the storage tank 1A, the inflow port portion 12a of the peripheral wall 12 is recessed on the outflow side from the inflow side adjacent portion 12c adjacent to the inflow port portion 12a. In the present embodiment, as shown in FIG. 7 and the like, the inflow side adjacent portion 12c of the peripheral wall 12 is connected to the inflow port portion 12a via two inflow side corner portions 12j and 12i.

Further, in the storage tank 1A, the outlet portion 12b of the peripheral wall 12 projects to the outflow side from the outflow side adjacent portion 12d. In the present embodiment, as shown in FIG. 7 and the like, the outflow side adjacent portion 12d of the peripheral wall 12 is connected to the outflow outlet portion 12b.

FIG. 10 is a right side view showing the right side surface of the storage tank 1A. FIG. 11 is a left side view showing the left side surface of the storage tank 1A. As shown in FIG. 10 and the like, in the storage tank 1A, the inflow port A1 is located below the peripheral wall 12 excluding the inflow port portion 12a and the outflow port portion 12b of the peripheral wall 12. Like the inlet A1, the outlet A2 is also located below the peripheral wall 12 excluding the inlet portion 12a and the outlet portion 12b of the peripheral wall 12.

FIG. 12 is a cross-sectional view taken along the line DD of FIG. FIG. 12 is a cross section of the storage tank 1A. FIG. 12 shows the internal structure of the liquid passage region R1 and the liquid retention region R2 inside the storage tank 1A. FIG. 13 is a cross-sectional view taken along the line EE of FIG. FIG. 13 shows the internal structure of the liquid retention region R2 inside the storage tank 1A. As shown in FIG. 12, in the storage tank 1A, the inflow port A1 is composed of an inflow path P1 formed in the inflow port portion 12a of the peripheral wall 12. Further, the outflow port A2 is composed of an outflow path P2 formed in the outflow port portion 12b of the peripheral wall 12. In the storage tank 1A, the liquid passage region R1 is the inner surface 12fa of the inflow port 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 of the peripheral wall 12. It is composed of an inner surface 12fb of the outlet portion 12b. In the storage tank 1A, as shown in FIG. 12, the bottom surface F1 of the liquid passage region R1 is composed of a flat surface. In the present embodiment, the bottom surface F1 of the liquid passage region R1 is the lowermost end of the inner surface 12fa of the inner surface 12a of the inflow port portion 12a of the peripheral wall 12 (the lowest end extending in the liquid flow direction of the inflow port portion 12a). 12fa1 (extended end) and 12fa1 of the innermost surface 11fa of the lower portion 11a of the bottom wall 11 (the lowest extending end extending in the liquid flow direction of the lower portion 11a) of the inner surface 11fa. Of the inner surface 12fb of the outlet portion 12b of the peripheral wall 12, the lowermost end of the inner surface 12fb (the lowermost extending end extending in the liquid flow direction of the outlet portion 12b) is the lowest end 12fb1. There is.

In FIG. 12, reference numeral 12fp1 is the lowermost end of the inflow path P1 (the lowermost extending end extending in the liquid flow direction of the inflow path P1). Further, reference numeral 12fp2 is the lowermost end of the outflow path P2 formed in the outflow port portion 12b (the lowermost extending end extending in the liquid flow direction of the outflow path P2). As shown in FIG. 12 and the like, in the storage tank 1A, the lowermost end (bottom surface) 11fa1 of the lower portion 11a of the bottom wall 11 is inclined downward toward the downstream, and the outlet A2 is from the inlet A1. Is also installed at a low position.

On the other hand, as shown in FIG. 7 and the like, the two liquid retention regions R2 are, in a plan view, the peripheral wall 12 excluding the inflow port portion 12a and the outflow port portion 12b, and the liquid passage region R1. It is partitioned by ,. Specifically, the two liquid retention regions R2 are, in plan view, the inner surface 12fi of the inflow side corner portion 12i, the inner surface 12fj of the inflow side corner portion 12j, the inner surface 12fc of the inflow side adjacent portion 12c, and the inflow side. It is partitioned by 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. Further, as shown in FIG. 13 and the like, the two liquid retention regions R2 are 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 and. In the storage tank 1A, as shown in FIG. 13, the bottom surface F2 of the liquid retention region R2 is formed of a flat surface. In the present embodiment, the bottom surface F2 of the liquid retention region R2 is composed of the inner surface 11fb of the upper portion 11b of the bottom wall 11.

FIG. 14 is a perspective view showing the FF cross section of FIG. 5 from the inflow side. The FF cross section is a cross section of a plane including the central axes of the two openings A3 of the top wall 14. As shown in FIG. 14, the groove portion G is arranged in the liquid passage region R1. The groove portion G is arranged between the inflow port A1 and the outflow port A2. As shown in FIG. 14 and the like, in the storage tank 1A, a part of the groove portion G is formed by the inner surface 11fa of the lower portion 11a of the bottom wall 11. In the storage tank 1A, the lower portion 11a of the bottom wall 11 is recessed with respect to the upper portion 11b of the bottom wall 11. In the present embodiment, the inner surface 11fa of the lower portion 11a of the bottom wall 11 is composed of the deepest surface 11fa1 and the two side surfaces 11fa2. The deepest surface 11fa1 is the deepest surface (lowermost 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 formed by a curved surface 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 formed by a curved surface in the extending direction of the liquid passage region R1.

Further, in the storage tank 1A, a part of the groove portion G is formed by the inner surface 12fb of the outlet portion 12b of the peripheral wall 12. As shown in FIG. 10 and the like, in the storage tank 1A, the outlet portion 12b of the peripheral wall 12 extends downward so that the outlet A2 is located below the outflow side adjacent portion 12d. .. As shown in FIG. 14, in the present embodiment, the inner surface 12fb of the outlet portion 12b of the peripheral wall 12 includes the deepest surface 12fb1 and the two side surfaces 11fb2. The deepest surface 12fb1 is connected to the side surface 12fb2 by a curved surface formed by a curved line in the extending direction view of the liquid passage region R1. The side surface 12fb2 constitutes 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 (lowermost end) of the inner surface 12fb of the outlet portion 12b of the peripheral wall 12. The deepest surface 12fb1 constitutes 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 constitutes the same plane as the inner surface 13f1 of the partition wall 13.

Further, as shown in FIG. 8 and the like, in the storage tank 1A, a part of the groove portion G is formed by the inner surface 11fa of the inflow port portion 12a of the peripheral wall 12. As shown in FIG. 10 and the like, in the storage tank 1A, the inflow port portion 12a of the peripheral wall 12 extends downward so that the inflow port A1 is located below the inflow side adjacent portion 12c. .. As shown in FIG. 8, in the present embodiment, the inner surface 12fa of the inflow port portion 12a of the peripheral wall 12 is composed of the deepest surface 12fa1 and the two side surfaces 11fa2. The deepest surface 12fa1 is connected to the side surface 12fa2 by a curved surface formed by a curved line in the extending direction view of the liquid passage region R1. The side surface 12fa2 constitutes the same plane as the side surface 11fa2 of the lower portion 11a of the bottom wall 11. As shown in FIG. 12 and the like, the deepest surface 12fa1 is the deepest surface (lowermost end) of the inner surface 12fa of the inflow port portion 12a of the peripheral wall 12. The deepest surface 12fa1 constitutes the same plane as the deepest surface 11fa1 of the lower portion 11a of the bottom wall 11. Further, as shown in FIG. 8 and the like, 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. 9 and the like, the two partition walls 13 extend toward the outlet A2. In the storage tank 1A, it extends toward the outlet A2 so as to secure the outlet A2. Here, "securing the outlet A2" means "not closing the opening of the outlet A2".

Further, as shown in FIG. 12, in the storage tank 1A, the partition wall 13 has a height H13 at which the liquid can overflow from the partition wall 13. In the present embodiment, the height H13 of the partition wall 13 is the height of the liquid passage region R1 from the bottom surface F1. As a result, the liquid passing through the liquid passage region R1 can flow to the liquid retention region R2 when the head of the liquid exceeds a certain level.

Further, as shown in FIG. 12 and the like, in the storage tank 1A, the height H13 of the partition wall 13 increases toward the outlet A2. As shown in FIG. 12 and the like, in the present embodiment, the top surface 13f2 of the partition wall 13 is a curved surface whose cross-sectional shape in the side view is convex toward the outflow side. As shown in FIG. 12, in the present embodiment, the curve of the top surface 13f2 of the partition wall 13 is composed of the radius of curvature R13.

In the storage tank 1A, 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 portion G. FIG. 15 is a perspective view showing the GG cross section of FIG. 5 from the inflow side. The GG cross section is a flat cross section including the boundary between the peripheral wall 12 and the bottom wall 11. As shown in FIG. 15 and the like, in the storage tank 1A, 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 is connected to the side surface 12fb2. It constitutes the same plane. Further, in the storage tank 1A, the inner surface 12fd of the outflow side adjacent portion 12d of the peripheral wall 12 adjacent to the outlet portion 12b of the peripheral wall 12 is connected to the top surface 13f2 of the partition wall 13 and is connected to the top surface 13f2 of the partition wall 13. It forms the same surface as 13f2. Here, the "identical surface" means a "continuous surface that is smoothly connected", and includes both a "planar surface" and a "curved surface".

FIG. 16 is a cross-sectional view taken along the line GG of FIG. As shown in FIG. 16, in the storage tank 1A, the edge portion 13e of the top surface 13f2 of the partition wall 13 is a curved surface that is convex toward the inside of the storage tank 1A.

Further, as shown in FIG. 13, in the storage tank 1A, 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 the side view is convex toward the outflow side. As shown in FIG. 13, in the present 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 embodiment, the radius of curvature Rd11 is the same as the radius of curvature R13 forming the curve of the top surface 13f2 of the partition wall 13. On the other hand, the curve on the top wall 14 side is composed of a radius of curvature Rd14 smaller than the curve on the bottom wall 11 side.

As a result of diligent tests and research, the inventor of the present application causes a large amount of liquid to flow out quickly and smoothly when the head of the liquid near the outlet of the storage tank is rapidly raised in the storage tank used for the siphon drainage system. It was found that the time until the siphon force is generated can be shortened. The storage tank 1A according to the present embodiment is made by paying attention to the fact that when the head of the liquid near the outlet A2 is rapidly raised, a large amount of liquid can be discharged quickly and smoothly.

As shown in FIG. 12 and the like, the storage tank 1A according to the present embodiment has an inflow port A1 into which the liquid flows in and an outflow port A2 in which the liquid flows out, and the liquid flowing in from the inflow port A1 is taken from the storage tank 1A. It is a storage tank that can be stored inside. The storage tank 1A includes a peripheral wall 12 that stands up against the bottom surface and two partition walls 13 that stand up against the bottom surface, and the peripheral wall 12 has an inflow port portion 12a in which the inflow port A1 is formed. It is provided with an outlet portion 12b facing the inlet portion 12a and forming an outlet A2. The two partition walls 13 extend toward the outlet A2. According to the storage tank 1A according to the present embodiment, by providing the partition wall 13, as shown by the arrow D1, the head of the liquid near the outlet A2 is secured while ensuring the flow of the liquid to the outlet A2. Can be increased quickly. Therefore, according to the storage tank 1A according to the present embodiment, a large amount of liquid can be discharged quickly and smoothly. In particular, if the storage tank 1A is used for the siphon drainage system as in the present embodiment, the time until the siphon force is generated can be shortened even when a large amount of liquid is drained.

Further, as shown in FIG. 12, in the present embodiment, the partition wall 13 has a height H13 at which the liquid can overflow from the partition wall 13. In this case, when the head of the liquid near the outlet A2 exceeds a certain level, the liquid near the outlet A2 can escape from the partition wall 13 as shown by the arrow D2 in FIG. Therefore, according to the present embodiment, the flow of the liquid is less likely to be obstructed in the vicinity of the outlet A2, and more rapid and smooth drainage becomes possible.

Further, as shown in FIG. 12, in the present embodiment, the height H13 of the partition wall 13 increases toward the outlet A2. In this case, while increasing the head of the liquid near the outlet A2, the amount of the liquid escaping from the partition wall 13 can be increased as the distance from the outlet A2 increases. Therefore, according to the present embodiment, it is possible to achieve a balance (compatibility) between shortening the time until the siphon force is generated and smooth drainage.

Further, as shown in FIG. 12, in the present embodiment, the outlet A2 is provided at a position lower than the inlet A1. In this case, faster and smoother drainage is possible. Therefore, according to the present embodiment, the time until the siphon force is generated can be further shortened.

Further, as shown in FIG. 15 and the like, in the present embodiment, the partition wall 13 is configured as a part of the outlet portion 12b of the peripheral wall 12, and the outflow of the peripheral wall 12 adjacent to the outlet portion 12b of the peripheral wall 12 is provided. 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 the 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 present embodiment, the flow of the liquid is less likely to be obstructed in the vicinity of the outlet A2, and more rapid and smooth drainage is possible.

Further, as shown in FIG. 16, in the present embodiment, the edge portion 13e of the top surface 13f2 of the partition wall 13 is a curved surface that is convex toward the inside of the storage tank 1A. In this case, as shown by the arrow D2, the liquid near the outlet A2 can be efficiently and smoothly escaped 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 present embodiment, it is possible to efficiently perform quick and smooth drainage.

Further, as shown in FIG. 13 and the like, in the present embodiment, 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 the side view is convex toward the outflow side. In this case, as shown by the arrow D3, the liquid in the storage tank, in this embodiment, the liquid released from the partition wall 13 is convected in the vertical direction (vertical direction) while causing convection (circulation flow) in the peripheral wall 12. It can be further escaped along the inner surface 12fd of the outflow side adjacent portion 12d. Therefore, according to the present embodiment, more rapid and smooth drainage is possible.

In particular, as shown in FIG. 7 and the like, the storage tank 1A according to the present embodiment has a liquid passage region R1 extending between the inlet A1 and the outlet A2 and both sides sandwiching the liquid passage region R1. It includes a liquid retention region R2 arranged at each position. In this case, as shown by arrows D1 and D2, the rest of the liquid can be retained in the liquid retention region R2 while flowing the liquid in the liquid passage region R1. Therefore, according to the present embodiment, a larger amount of liquid can be stored in the liquid retention region R2 while suppressing the increase in the length of the liquid passage region R1 in the extending direction. Therefore, according to the storage tank 1A, the flow of the liquid is less likely to be obstructed in the vicinity of the outlet A2, and more liquid can be drained quickly and smoothly. In addition, in this case, the liquid flowing from the liquid passage region R1 can be convected (circulated flow) between the liquid passage region R1 and the liquid retention region R2 as shown by the arrow D4. Therefore, according to the present embodiment, it is possible to quickly and smoothly drain more liquid while suppressing the 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 1A. As a result, the number of operations required for cleaning the storage tank 1A can be reduced.

Further, according to the present embodiment, the liquid retention region R2 is arranged at each position on both sides of the liquid passage region R1. Therefore, in order to secure the volume of the liquid retention region R2, for example, the said 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 prevent the height of the liquid retention region R2 and the height of the storage tank 1A from increasing. Therefore, as in the present embodiment, for example, in the storage tank 1A, the direction in which the liquid retention region R2 extends on both sides of the liquid passage region R1 is the horizontal direction, and the erecting direction of the peripheral wall 12 is the vertical direction. As described above, if the floor slab 102 or the like is installed, 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 1A" is the height (dimensions) of the storage tank 1A in the vertical direction. In other words, it is the height (dimension) of the peripheral wall 12 of the storage tank 1A in the vertical direction.

From the above viewpoint, more specifically, for example, in the present embodiment, the height of the storage tank 1A can be lower than the width of the storage tank 1A, and preferably the height of the storage tank 1A is the storage tank 1A. The height of the storage tank 1A is ½ or less, and more preferably 1/3 or less of the width of the storage tank 1A. Here, the "width of the storage tank 1" is 2 in the peripheral wall 12 of the storage tank 1A facing each other, in the direction perpendicular to the height direction of the storage tank 1A and the extending direction of the liquid passage region R1. The maximum width between the two peripheral walls 12. That is, referring to FIG. 7, it 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. 7 and the like, in the storage tank 1A, the inflow port portion 12a of the peripheral wall 12 is recessed on the outflow side from the inflow side adjacent portion 12c of the peripheral wall 12 adjacent to the inflow port portion 12a. In this case, the liquid flowing in the storage tank 1A tends to return to the outflow direction of the liquid. Therefore, drainage can be performed more quickly and smoothly. In particular, in the present embodiment, since the liquid retention region R2 is arranged at a position adjacent to the liquid passage region R1, the liquid flowing from the liquid passage region R1 easily returns to the liquid passage region R1. That is, in the present embodiment, convection can be efficiently performed between the liquid passage region R1 and the liquid retention region R2. Therefore, according to the present embodiment, a large amount of liquid can be drained more quickly and smoothly through the liquid passage region R1. Further, in the present embodiment, dirt is less likely to adhere to the inside of the storage tank 1A. As a result, the number of operations required for cleaning the storage tank 1A can be further reduced.

Further, as shown in FIG. 15 and the like, the partition wall 13 stands up from a position adjacent to the groove portion G. In the present embodiment, 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. Therefore, quicker and smoother drainage is possible. In the present embodiment, the partition wall 13 stands up from a position adjacent to the groove portion G arranged 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 present embodiment, a large amount of liquid can be drained more quickly and smoothly through the liquid passage region R1. In particular, in this case, since the partition wall 13 stands up from a position adjacent to the groove portion G arranged in the liquid passage region R1, the head of the liquid near the outlet A2 can be raised more quickly. Therefore, according to the present embodiment, a large amount of liquid can be drained even more quickly and smoothly through the liquid passage region R1.

Further, as shown in FIG. 7 and the like, in the storage tank 1A, of the inner surface 12f of the peripheral wall 12, the inner surface 12f of the peripheral wall 12 forming a corner inside the storage tank 1A in a plan view has a curved contour shape in a plan view. It is a curved surface consisting of. In the present embodiment, for example, the inner surface 12fi of the inflow side corner portion 12i, the inner surface 12ffj of the inflow side corner portion 12j, the inner surface 12ff of the inflow side corner portion 12f, and the inner surface 12fg of the outflow side corner portion 12g are contours in a plan view, respectively. It is a curved surface whose shape is a curved surface. In this case, the liquid flowing from the liquid passage region R1 can be convected more efficiently between the liquid passage region R1 and the liquid retention region R2. Therefore, according to the present embodiment, a large amount of liquid can be drained more smoothly, and the number of operations required for cleaning the storage tank 1A can be further reduced.

By the way, as a result of diligent tests and research, the inventor of the present application causes a large amount of liquid to flow out quickly and smoothly even when liquid is collected near the outlet of the storage tank used in the siphon drainage system. It was found that it was possible to shorten the time until the siphon force was generated. The storage tank 1A according to the present embodiment is made by paying attention to the fact that when liquids are collected in the vicinity of the outlet A2, a large amount of liquid can be discharged quickly and smoothly.

In the storage tank 1A, the outlet portion 12b of the peripheral wall 12 projects to the outflow side from the outflow 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 is such that the liquid can be easily collected near the outlet A2. Therefore, according to the present embodiment, a large amount of liquid can be discharged quickly and smoothly. In particular, if the storage tank 1A is used for the siphon drainage system as in the present embodiment, the time until the siphon force is generated can be shortened even when a large amount of liquid is drained.

FIG. 17 is a sectional view taken along the line HH of FIG. 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. 17, in the storage tank 1A, the inner surface 12fb of the outlet portion 12b of the peripheral wall 12 has a race track shape in cross section in the liquid flow direction. In this case, the structure is such that the liquid can be more easily collected in the vicinity of the outlet A2. In the present embodiment, the race track shape is a flat shape extending in the horizontal direction (horizontal direction). Exemplary race track shapes include a one-sided single-core race track shape with one center O1 on one side, and a one-sided two-core race track shape with two center O1 and center O2 on one side. A race track shape of a three-core circle on one side in which three centers O1, center O2 and center O3 are arranged on one side can be mentioned. Further, as the race track shape of the three-centered circle on one side, the race track shape of the regular three-centered circle on one side in which the three centers O1 to O3 are aligned, and one center O2 between the two centers O1 and the center O3 is arranged on the outside. There is a race track shape of a sharp three-core circle on one side, and a race track shape of a blunt three-core circle in which one center O2 between two centers O1 and the center O3 is arranged inside. In the present embodiment, the cross-sectional shape of the outlet A2 is similar to the race track shape of a sharp three-core circle on one side. In this embodiment, the two centers O1 and the center O2 sandwiching the center O2 are not aligned, and a straight line is formed between AB. The rest is a curve.

From the viewpoint 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 race track shape in terms of the cross-sectional shape in the direction of liquid flow. On the other hand, the inner surface 12fb of the outlet portion 12b of the peripheral wall 12 can have a circular or elliptical cross-sectional shape in the direction of liquid flow. When the inner surface 12fb of the outlet portion 12b of the peripheral wall 12 is circular or elliptical in the direction of liquid flow, it becomes easy to flow a large flow rate of liquid. However, the circular and elliptical cross-sectional shapes are the cross-sectional shapes when specialized for a large flow rate. Therefore, as in the present embodiment, when it is desired to continuously flow the liquid, the race track shape as illustrated in FIG. 17 or the like is preferable.

In addition, in the storage tank 1A, as shown in FIG. 7 and the like, the inner surface 12fb of the outlet portion 12b of the peripheral wall 12 includes a curved surface that tapers toward the outlet A2. In this case, the structure is such that the liquid can be more easily collected in the vicinity of the outlet A2.

By the way, as shown in FIG. 16, in the storage tank 1A, the bottom surface F2 of the liquid retention region R2 is inclined downward toward the liquid passage region R1 in the extending direction of the liquid passage region R1, and the liquid passage region is concerned. It is a plane connected to the bottom surface F1 of R1. In this case, the liquid in the liquid retention region R2 easily flows into the liquid passage region R1 through the bottom surface F2 of the liquid retention region R2. Therefore, according to the present embodiment, a large amount of liquid can be drained more smoothly through the liquid passage region R1. In the present embodiment, the bottom surface F2 of the liquid retention region R2 is inclined at an angle θ11b with respect to the horizontal axis (in FIG. 16, the 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 appropriately set according to the internal capacity, size, and the like of the storage tank 1. The angle θ11b can be, for example, an angle of 0.5 ° to 5 °. If the angle θ11b is less than 0.5 °, it is less effective in forming convection of drainage. Further, when the angle θ11b is 5 ° or more, the inclination becomes too steep, so that if the liquid does not enter the outlet A2 and the water overflows, the overflowing liquid does not flow well to the liquid retention region R2.

By the way, in the storage tank 1A, as shown in FIG. 16, 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 a V-groove having the directly connected portions of the two bottom surfaces F2 as the groove bottoms. Alternatively, if the lower ends of the bottom surfaces F2 of the two liquid retention regions R2 are connected via a plane, the liquid passage region R1 can be a trapezoidal V-groove having the plane as the groove bottom. The bottom surface F1 of these liquid passage regions R1 is at the same height as the bottom surface F2 of the two liquid retention regions R2.

On the other hand, as shown in FIG. 12 and the like, in the storage tank 1A, the bottom surface F1 of the liquid passage region R1 is arranged at a position lower than the bottom surface F2 of the liquid retention region R2. In this case, many liquids can be collected in the liquid passage region R1. Therefore, according to the present embodiment, a large amount of liquid can be drained more smoothly through the liquid passage region R1. In the present embodiment, the groove portion G is arranged in the liquid passage region R1. The lowermost end 12fP2 of the outlet A2 is arranged at a position lower than the bottom surface F2 of the liquid retention region R2.

Further, as shown in FIGS. 12 to 16, in the present embodiment, at least the inner surface 12f of the peripheral wall 12 in the liquid retention region R2 has a cross-sectional shape of the peripheral wall 12 in the extending direction from the inside to the outside of the storage tank 1A. It is a curved surface consisting of a convex curve. 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 generating vertical (longitudinal) convection (circulation flow). 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 present embodiment, a large amount of liquid can be drained more smoothly, and the number of operations required for cleaning the storage tank 1A can be further reduced.

Further, in the present embodiment, as shown in FIGS. 3 and 4, in the liquid passage region R1, the outlet A2 is at least the inlet A1 in the flow direction view of the liquid (extended direction view of the liquid passage region R1). It is aligned so that it overlaps a part in a straight line.

Referring to FIG. 3, specific examples of the alignment of the inlet A1 and the outlet A2 include, for example, a method of combining any of the following (1) to (3).
(1) The center Oa of the inflow port A1 and the center Ob of the outflow port 1b are aligned on the same vertical line Oz in the extending direction of the liquid passage region R1.
(2) The size of the inner diameter of the inlet A1 (the size of the radius ra of the inlet A1) and the size of the inner diameter of the outlet A2 (the size of the radius rb of the outlet A2) are adjusted.
(3) The distance ΔZ between the center Oa of the inlet A1 and the center Ob of the outlet A2 in the vertical direction (direction of the vertical line Oz) is adjusted.

In this embodiment, using all the methods (1) to (3), the outlet A2 overlaps with at least a part of the inlet A1 in a straight line in the extending direction of the liquid passage region R). It is aligned like this. In particular, as shown in FIG. 3, in the present embodiment, the size of the inner diameter of the outlet A2 is set to be smaller than the size of the inner diameter of the inlet A1 in (2). As a result, the amount of liquid flowing out from the outlet A2 is smaller than the amount of liquid flowing out from the inlet A1. Further, in the present embodiment, as shown in FIG. 3, in (3), the center Oa of the inlet A1 and the center Ob of the outlet A2 are the openings of the outlet A2 at the lower end of the opening of the inlet A1. The vertical spacing ΔZ is adjusted so that the inner upper ends overlap.

The above description describes an exemplary embodiment of the present invention, and various modifications can be made without departing from the scope of the claims. For example, the storage tank 1 can be integrally manufactured by injection molding with a resin. In particular, the storage tank 1A can be blow molded. However, the manufacturing method of the storage tank 1 is not limited to injection molding. The storage tank 1 may or may not have a top wall 14 formed at the upper end of the peripheral wall 12. Further, the configuration of the drainage system 100 is not limited to the configuration of the present embodiment. For example, the equipment drainage pipe 120 and the siphon drainage pipe 130 have been described as a drainage pipe in which the upstream side portion (horizontal pulling pipe) and the downstream side portion (vertical pipe) are integrated, but the upstream side portion (horizontal pulling pipe). And the downstream part (vertical pipe) are separate drain pipes, and by connecting these drain pipes to each other, it is possible to make an instrument drain pipe 120 or a siphon drain pipe 130.

1A: Storage tank, A1: Inflow port, P1: Inflow path, A2: Outlet, P2: Outflow channel, 1c: Vent, 11: Bottom wall, 11a: Lower part of bottom wall, 11fa: Under bottom wall Inner surface of the side part, 11fa1: Deepest surface of the lower part of the bottom wall, 11fa2: Side surface of the lower part of the bottom wall, 11b: Upper part of the bottom wall, 11fb: Inner surface of the upper part of the bottom wall, 12: Peripheral wall, 12a: Inlet portion of the peripheral wall, 12fa: Inner surface of the inlet portion of the peripheral wall, 12fa1: Deepest surface of the inner surface of the inlet portion of the peripheral wall, 12fa2: Side surface of the inner surface of the inlet portion of the peripheral wall, 12b: Outlet portion of the peripheral wall , 12fb: Inner surface of the outlet part of the peripheral wall, 12fb1: Deepest surface of the inner surface of the outlet part of the peripheral wall, 12fb2: Side surface of the inner surface of the outlet part of the peripheral wall, 12c: Adjacent to the inlet of the peripheral wall, 12fc: Flow of the peripheral wall 12d: Inner surface of the outlet adjacent part of the peripheral wall, 12fd: Inner surface of the outlet adjacent part of the peripheral wall, 12e: Side part of the peripheral wall, 12fe: Inner surface of the side surface part of the peripheral wall, 12f: Inflow side corner part of the peripheral wall , 12ff: Inner surface of the inflow side corner of the peripheral wall, 12i: Inflow side corner of the peripheral wall, 12fi: Inner surface of the inflow side corner of the peripheral wall, 12j: Inflow side corner of the peripheral wall, 12fj: Inflow side corner of the peripheral wall Inner surface, 12g: Outflow side corner of the peripheral wall, 12fg: Inner surface of the outflow side corner of the peripheral wall, 13: Partition wall, 13f1: Side of the partition wall, 13f2: Top surface of the partition wall, 13e: Top surface of the partition wall Edge, R1: Liquid passage area, G: Groove, F1: Bottom of liquid passage area, R2: Liquid retention area, F2: Bottom of liquid retention area, 100: Drainage system, 101: Floor member, 102: Floor slab , 110: Water supply equipment, 120: Equipment drain pipe, 120a: Upstream part of equipment drain pipe, 120b: Downstream part of equipment drain pipe, 121: Drain trap, 130: Siphon drain pipe, 130a: Siphon drain pipe Horizontal pull pipe, 130b: Vertical pipe of siphon drain pipe, 140: Pipe joint, 150: Vertical pipe, S: Underfloor space

Claims (5)

A storage tank having an inflow port into which a liquid flows in and an outflow port into which the liquid flows out, and capable of storing the liquid flowing in from the inflow port inside.
It has a peripheral wall that stands up against the bottom,
The peripheral wall includes an inlet portion in which the inlet is formed, and an outlet portion facing the inlet portion and forming the outlet.
The outlet portion of the peripheral wall protrudes to the outflow side from the outflow side adjacent portion of the peripheral wall adjacent to the outlet portion of the peripheral wall .
A storage tank in which the inflow port portion of the peripheral wall is recessed on the outflow side of the inflow side adjacent portion of the peripheral wall adjacent to the inflow port portion of the peripheral wall . A storage tank having an inflow port into which a liquid flows in and an outflow port into which the liquid flows out, and capable of storing the liquid flowing in from the inflow port inside.
It has a peripheral wall that stands up against the bottom,
The peripheral wall includes an inlet portion in which the inlet is formed, and an outlet portion facing the inlet portion and forming the outlet.
The outlet portion of the peripheral wall protrudes to the outflow side from the outflow side adjacent portion of the peripheral wall adjacent to the outlet portion of the peripheral wall .
A storage tank comprising a liquid passage region extending between the inlet and the outlet, and liquid retention regions arranged at respective positions on both sides of the liquid passage region . The storage tank according to claim 1 or 2 , wherein the inner surface of the peripheral wall adjacent to the outflow side is a curved surface having a curved cross-sectional shape that is convex toward the outflow side. The storage tank according to any one of claims 1 to 3, wherein the inner surface of the outlet portion of the peripheral wall has a race track shape in cross-sectional shape in terms of liquid flow direction. The storage tank according to any one of claims 1 to 4 , wherein the inner surface of the outlet portion of the peripheral wall includes a curved surface that tapers toward the outlet.

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