TWI672417B - Storage tank, siphon-style drainage system and outflow pipe connection member - Google Patents

Abstract

The storage tank is provided with: a storage tank body that can store liquid flowing in from the upstream side to the inside; a flow channel reduction portion is provided on the downstream side of the storage tank body, and the cross-sectional area of the flow channel on the downstream side is smaller than that on the upstream side An outflow port is provided on the downstream side of the narrowed portion of the flow channel to allow liquid to flow out of the storage tank body; and an inner wall surface is provided on a portion of the reduced portion of the flow channel and protrudes to the outside of the reduced portion of the flow channel. Use this storage tank to construct a siphonic drainage system. The outflow pipe connection member is provided with a flow path narrowing portion and an outflow port, and is assembled in the storage tank body.

Description

Storage tank, siphonic drainage system and outflow pipe connecting member (1)

The invention relates to a storage tank, a siphon type drainage system and an outflow pipe connecting member.

The following Patent Document 1 discloses a siphon type drainage system. The siphon type drainage system connects a water appliance to the upstream side of the cross-drawn pipe, and connects the downstream side of the cross-drawn pipe to a riser with a drop relative to the upstream side. With this, the siphon force is used to drain water from the water appliance to the riser. The above-mentioned siphon type drainage system is provided with a rectangular storage tank (chamber) on the upstream side of the cross-pull pipe. The storage tank is configured to temporarily store the drainage when a large amount of drainage is performed by a water appliance at one time.

[Previous Technical Literature]

[Patent Literature]

Patent Document 1: Japanese Patent Application Laid-Open No. 2006-336322

In the siphon type drainage system described above, the drainage flowing into the storage tank will strongly impact the wall surface near the outflow port, thereby preventing the outflow of the drainage from the outflow port. As a result, the amount of outflow of drainage will be reduced, and there is room for improvement.

The present invention takes the above circumstances into consideration, and aims to obtain a storage tank, a siphon type drainage system, and an outflow pipe connecting member that can easily flow out of the outflow and increase the outflow of liquid.

The storage tank related to the first embodiment of the present invention is provided with: a storage tank body capable of storing liquid flowing from the upstream side toward the inside; a flow path narrowing portion provided on the downstream side of the storage tank body, And the cross-sectional area of the downstream channel will be smaller than the upstream side; the outlet is located downstream of the reduced portion of the flow channel to allow liquid to flow out of the storage tank body; and the inner wall surface is provided at the reduced portion of the flow channel And protrudes toward the outside of the narrowed portion of the flow channel.

In the storage tank according to the first embodiment, the storage tank body can store liquid flowing from the upstream side toward the inside. The downstream side of the storage tank body is provided with a flow channel reducing portion, and the downstream side of the storage channel body is provided with an outlet for allowing liquid to flow out of the storage tank body.

Here, a part of the flow path reduction portion is provided with an inner wall surface protruding toward the outside of the flow path reduction portion. The liquid that flows from the upstream side to the downstream side of the storage tank body and cannot flow out of the outflow port is guided along the inner wall surface in a direction away from the outflow port. Therefore, it is difficult for the liquid flowing from the upstream side toward the outflow port to be suppressed by the liquid that cannot flow out of the outflow port.

The storage tank according to the second embodiment of the present invention is the storage tank according to the first embodiment, and the inner wall surface has a curved surface protruding to the outside of the reduced portion of the flow channel.

According to the storage tank according to the second embodiment, since the inner wall surface has a curved surface protruding to the outside of the narrowed portion of the flow path, the liquid that can flow from the upstream side of the storage tank body to the downstream side and cannot flow out of the outlet will follow the inside. The curved surface of the wall surface is smoothly guided in a direction away from the outflow port. Therefore, it is difficult for the liquid flowing from the upstream side toward the outflow port to be suppressed by the liquid that cannot flow out of the outflow port.

The storage tank related to the third embodiment of the present invention is the storage tank related to the first embodiment. The storage tank system is provided with an inflow port for the liquid to flow into the storage tank.

According to the storage tank according to the third embodiment, an inlet is provided on the upstream side of the storage tank body to allow liquid to flow from the inlet to the inside. Since the inflow port is provided opposite to the outflow port, the liquid flowing in from the inflow port flows straight toward the outflow port. Therefore, allowing the liquid to flow linearly makes it difficult for the liquid flowing from the upstream side toward the outflow port to be suppressed by the liquid that cannot flow out of the outflow port.

The storage tank according to the fourth embodiment of the present invention is the storage tank according to the first embodiment, and the flow path reduction portion is provided with a first flow path reduction portion on the storage tank body side and a second flow path on the outflow port side. The narrowed portion is configured; the outflow port is formed by a tubular outflow pipe connection portion extending from the second flow path narrowed portion to the downstream side.

According to the storage tank according to the fourth embodiment, the flow path reduction section is configured by including a first flow path reduction section on the storage tank body side and a second flow path reduction section on the outflow port side. Then, outflow It is formed by a tubular outflow pipe connection portion extending from the second flow path reduction portion to the downstream side. That is, the cross-sectional area of the flow path of the second flow path reduction portion is larger than the cross-sectional area of the flow path of the outflow pipe connection portion. Therefore, the amount of liquid flowing into the narrowing portion of the second flow path increases, and the amount of liquid flowing out of the outlet can be increased. In addition, since the amount of liquid that cannot flow out of the outflow port decreases, it is difficult to suppress the liquid flowing out of the outflow port from the upstream side toward the outflow port.

The storage tank according to the fifth embodiment of the present invention is a storage tank according to the fourth embodiment, and the second flow path reduction portion is formed with a shunt wall surface protruding toward the storage tank body side.

According to the storage tank according to the fifth embodiment, a shunt wall surface is formed in the second flow path reduction portion, and the shunt wall surface protrudes toward the storage tank body side. Therefore, the flow direction of the liquid impinging on the dividing wall surface will not change sharply, but will gradually change towards the outlet. Therefore, the liquid impinging on the dividing wall surface will not stay near the dividing wall surface and can flow out of the outlet. As a result, it is difficult to suppress the flow of the liquid from the upstream side toward the outflow port by the liquid that cannot flow out of the outflow port.

The storage tank related to the sixth embodiment of the present invention is the storage tank related to the first embodiment. The upstream side of the storage tank body is provided with other storage tanks connected by a communication port. The liquid overflowing from the body flows out.

In the storage tank related to the sixth embodiment, since the liquid can be overflowed to other storage tanks when the storage capacity of the storage tank body is exceeded, the storable flow rate can be supplemented by other storage tanks.

The siphon type drainage system according to the seventh embodiment of the present invention is provided with a storage tank as in any one of the first embodiment to the sixth embodiment, and the first pipe is a water device and an upstream side of the storage tank. And a second pipe connected to the outlet of the storage tank and having a vertical pipe for discharging liquid to a position lower than the outlet.

The siphon type drainage system according to the seventh embodiment includes a storage tank, a first pipe, and a second pipe. The first pipe allows liquid from a water appliance to flow into the storage tank. When the amount of liquid inflow is greater than the amount of liquid flowing out from the outlet of the storage tank, the inflowing liquid will be stored in the storage tank. The stored liquid is discharged from the outlet of the storage tank through the second pipe. Therefore, in the storage tanks related to the first embodiment to the sixth embodiment, since the liquid flow from the upstream side toward the outflow port is not easily suppressed by the liquid that cannot flow out of the outflow port, the amount of liquid outflow can be increased. Therefore, the time required to fill the vertical pipe of the second pipe can be shortened, and the time required to start the siphon force can be shortened.

The outflow pipe connection member according to the eighth embodiment of the present invention is an outflow pipe connection member that can be assembled on the downstream side of the storage tank body that can store the liquid flowing from the upstream side to the inside, and includes: a flow path reduction portion, which is provided in The downstream side, and the cross-sectional area of the downstream side of the flow channel will be smaller than the upstream side; the outflow port is provided on the downstream side of the reduced portion of the flow channel to allow the liquid to flow out of the reduced portion of the flow channel; A part of the narrowed portion of the flow channel protrudes toward the outside of the narrowed portion of the flow channel.

The outflow pipe connecting member according to the eighth embodiment has a flow path reduction portion, an outflow port, and an inner wall surface protruding toward the flow path reduction portion. Thus, the outflow pipe connection member can be assembled on the downstream side of the storage tank body. Therefore, a storage tank in which the outflow pipe connection member is assembled to the storage tank body can be easily manufactured so that the liquid flow from the upstream side toward the outflow port is not easily suppressed by the liquid that cannot flow out of the outflow port.

The storage tank, the siphon type drainage system and the outflow pipe connection member related to the present invention have the excellent effect of allowing liquid to easily flow out of the outflow port and increasing the outflow of liquid.

10‧‧‧Siphonic drainage system

14‧‧‧ Water appliances

22‧‧‧The first piping

24‧‧‧ 2nd piping

28‧‧‧ riser

30‧‧‧Storage tank

32‧‧‧Storage tank body

32C‧‧‧Internal

34‧‧‧Inlet pipe connection member

34B‧‧‧Inlet pipe connection

34D‧‧‧ Overflow pipe connection

36‧‧‧ Outlet pipe connection member

36S‧‧‧ runner narrowing section

36A‧‧‧No. 1 runner narrowing section

36B‧‧‧Second runner narrowing section

36D‧‧‧ Diverting wall surface

36E‧‧‧Inner wall surface

36G‧‧‧Inner bottom

36J‧‧‧Outflow pipe connection

40‧‧‧The first storage department

50‧‧‧Second storage section

60‧‧‧ overflow pipe

62‧‧‧ Snorkel

IN‧‧‧Inlet

OUT‧‧‧ Outlet

FIG. 1 is a schematic side view of a siphon type drainage system according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a storage tank of the siphon type drainage system shown in FIG. 1. FIG.

FIG. 3 is a side view of an inflow pipe connection member that can be assembled in the storage tank shown in FIG. 2.

FIG. 4 is a plan view of the inflow pipe connection member shown in FIG. 3. FIG.

Fig. 5 is a cross-sectional view of the inflow pipe connecting member shown in Figs. 3 and 4 (a cross-sectional view taken along line A-A in Fig. 4).

FIG. 6 is a side view of an outflow pipe connecting member that can be assembled in the storage tank shown in FIG. 2.

FIG. 7 is a plan view of the outflow pipe connecting member shown in FIG. 6.

Fig. 8 is a cross-sectional view of the inflow pipe connecting member shown in Figs. 6 and 7 (a cross-sectional view taken along line B-B in Fig. 7).

FIG. 9 is a sectional perspective view of the outflow pipe connecting member shown in FIGS. 6 and 7.

Fig. 10 (A) is a schematic side view showing a liquid outflow state when the storage tank according to the first embodiment is half full of water; (B) is a schematic side showing a liquid outflow state of the storage tank according to the first comparative example at the same flow rate. View; (C) A schematic side view showing a state where the storage tank of the second comparative example has the same flow rate of the liquid flowing out.

FIG. 11 (A) is a schematic side view showing a liquid outflow state when the storage tank according to the first embodiment is close to full water; (B) is a schematic side showing a liquid outflow state of the storage tank according to the first comparative example at the same flow rate. View; (C) A schematic side view showing a state where the storage tank of the second comparative example has the same flow rate of the liquid flowing out.

FIG. 12 (A) is a schematic perspective view of a storage tank and an outflow pipe connection member related to the second embodiment of the present invention; (B) to (E) are storage tanks and outflow pipes related to the first modification to the fourth modification. A schematic perspective view of a connection member.

FIG. 13 (A) is a schematic cross-sectional view of the inner wall surface of the wall portion of the outflow pipe connection member when viewed from the side of the storage tank according to the third embodiment of the present invention; (B) The inner wall surface according to the fifth modification corresponds to (A). ) Is a schematic cross-sectional view; (C) is a schematic cross-sectional view of the inner wall surface according to the sixth modification corresponding to (A).

[First Embodiment]

The storage tank, the siphon type drainage system, and the outflow pipe connection member according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 11. Here, the arrow X, which is suitable for the figure, indicates the flow path direction from the upstream side to the downstream side, and the arrow Y indicates the direction orthogonal to the flow path direction in the horizontal direction. The arrow Z indicates the vertical upper side with respect to the flow channel direction. In addition, the application directions of the storage tank, the siphon type drainage system, and the outflow pipe connection member according to the first to third embodiments are not limited.

(Construction of Siphonic Drainage System 10)

As shown in FIG. 1, the siphonic drainage system 10 according to the present embodiment is mainly provided with a water appliance 14, a first pipe 22, a storage tank 30, and a second pipe arranged on a plate (SLAB) 12 of a building. 24 和 立 管 28。 24 and the riser 28.

The water appliance 14 in this embodiment is configured to include a bathtub 16, a bathroom 18, a drainage pipe 20A, and a drainage well 20B. The water appliance 14 is arranged on the liquid flow path, here the drainage flow path for drainage, and is arranged upstream of the storage tank 30. The configuration of the water appliance 14 is not limited to this example. The first pipe 22 is piped to the plate body 12 in a substantially horizontal state. One end portion on the upstream side of the first pipe 22 is connected to the drainage well 20B of the water appliance 14, and the downstream side of the first pipe 22 is connected to the storage tank 30.

The second piping 24 is a piping downstream of the storage tank 30. One end portion 24A on the upstream side of the second piping 24 is connected to the storage tank 30, and the end portion 24A to the intermediate portion 24B of the second piping 24 is piped to the plate 12 as a horizontally drawn pipe in a substantially horizontal state. The other end portion 24C on the downstream side of the second piping 24 is along the riser 28 extending from the intermediate portion 24B to the lower side in the vertical direction, and the pipe is erected in the downward direction as a standpipe, and is connected to the one end portion 24A in the storage tank 30 A lower position H1 is formed at the lower connection position to connect to the riser 28. This connection uses a bus joint 26.

In the siphon type drainage system 10, water can be discharged from the water appliance 14 through the first pipe 22, the storage tank 30, the second pipe 24, and the manifold 26 to the riser 28. Drainage can use siphon force. When a large amount of water is drained from the water appliance 14 at one time, the storage tank 30 can temporarily store the drained water.

(Structure of Storage Tank 30)

As shown in FIG. 2, the storage tank 30 mainly includes a storage tank body 32, an inflow pipe connection member 34, and an outflow pipe connection member 36. In addition, the storage tank 30, as viewed from the storage tank body 32, is provided with a first storage section 40 and a second storage section 50 that temporarily store drain water exceeding the storage capacity of the storage tank body 32 as another storage tank. In this embodiment, the storage tank 30 is provided with two first storage sections 40 and a second storage section 50. However, according to the drainage flow rate flowing into the siphon drainage system 10 at a certain time, the number of other storage tanks may be Increase or decrease. For example, when the drainage capacity is small, the storage tank 30 is provided with the first storage portion 40. When the drainage capacity is large, in addition to the first storage section 40 and the second storage section 50, a plurality of storage sections are provided in the storage tank 30.

(Structure of Storage Tank Body 32)

The storage tank body 32 is formed into a cylindrical tube shape extending from the upstream side to the downstream side with the tube axis C1 direction (see FIG. 5) as the longitudinal direction. The storage tank body 32 is formed using a resin material such as vinyl chloride, a non-ferrous metal material, a metal material such as iron, and other elastic materials such as rubber. The storage tank body 32 has a larger diameter than the first piping 22 or the second piping 24, and is configured to temporarily store drain water flowing from the upstream side toward the inside 32C of the storage tank 32.

(Construction of the inflow pipe connection member 34)

The inflow pipe connection member 34 may be assembled on the upstream side of the storage tank body 32. As shown in FIGS. 2 to 5, the inflow pipe connection member 34 is mainly configured to include a wall portion (upstream side wall portion) 34A, an inflow pipe connection portion 34B, a main body connection portion 34C, and an overflow pipe connection portion 34D. Wall portion 34A will block the storage tank One end portion 32A on the upstream side of the body 32 constitutes the internal 32C as a closed space together with the storage tank body 32 and the outflow pipe connection member 36 (). The wall portion 34A is formed in a shape protruding toward the upstream side.

The inflow pipe connection portion 34B is a cylindrical tube that is disposed at a lower portion in the vertical direction of the wall portion 34A and extends from the downstream side to the upstream side in the direction of the pipe axis C2. The pipe axis C2 of the inflow pipe connection portion 34B is located lower than the pipe axis C1 of the storage tank body 32 in the vertical direction, and is located at the vertical direction position P1 of the pipe shaft C1 and the inner bottom of one end portion 32A of the storage tank body 32 (refer to the figure) 5) The middle part. One end (not shown) on the upstream side of the inflow pipe connection portion 34B is connected to the other end portion of the first pipe 20 shown in FIGS. 1 and 2. The other end portion (the symbol is omitted) on the downstream side of the inflow pipe connection portion 34B is integrally formed in the wall portion 34A as shown in FIGS. 3 to 5. The upstream side of the inflow pipe connection portion 34B becomes an inflow port IN through which the drainage flows from the first pipe 22 through the inflow pipe connection portion 34B to the inside 32C of the storage tank body 32.

The main body connecting portion 34C is formed in a cylindrical shape with the upstream side being integrally formed on the peripheral edge of the wall portion 34A and extending from the upstream side to the downstream side in the direction of the tube axis C1 of the storage tank body 32. The main body connection portion 34C is set to have the same inner diameter as or slightly larger than the outer diameter of the storage tank body 32, and is configured to be inserted into one end portion 32A of the storage tank body 32 and connected thereto. A boundary wall portion 34C between the main body connecting portion 34C and the wall portion 34A (or the inflow pipe connecting portion 34B or the overflow pipe connecting portion 34D) is provided with a stepped vertical wall 34F which is reduced in diameter from the inner diameter of the main body connecting portion 34C. In the interior of the main body connection portion 34C, one end portion 32A of the storage tank body 32 can be inserted into the stepped vertical wall 34F, and the stepped vertical wall 34F is used for assembling the inflow pipe connection member 34 to the storage tank body 32 for positioning.

Here, as shown in FIG. 5, in a state (connected state) where one end portion 32A of the storage tank body 32 is assembled in the inflow pipe connection member 34, the vertical position P1 of the bottom portion of the one end portion 32A and the inflow pipe connection portion 34B The vertical position P2 of the inner bottom is consistent. That is, the stepped portion is not formed in the drainage flow path from the inflow pipe connection portion 34B to the storage tank body 32.

The overflow pipe connection portion 34D is a cylindrical tube that is disposed in a vertical upper portion of the wall portion 34A and extends in the direction of the pipe axis C3 from the downstream side to the upstream side. The tube axis C3 is located vertically above the tube axis C1 of the storage tank body 32, and is located at the middle of the vertical position P6 (refer to FIG. 5) of the tube inner portion of the tube axis C1 and one end portion 32A of the storage tank body 32 . One end (not shown) on the upstream side of the overflow pipe connection portion 34D is connected to the first storage portion 40 and the second storage portion 50 shown in FIG. 2. As shown in FIGS. 3 to 5, the other end portion (not shown) on the downstream side of the overflow pipe connection portion 34D is integrally formed with the wall portion 34A. The downstream side of the overflow pipe connection portion 34D becomes a The drainage overflow inside 32C of 32 is connected to the communication port OF of the first storage section 40 and the second storage section 50.

The inflow pipe connection member 34 has a complicated structure such as the inflow pipe connection portion 34B, and is formed by injection molding using a resin material such as vinyl chloride.

(Configuration of Outflow Pipe Connection Member 36)

The outlet pipe connection member 36 may be assembled downstream of the storage tank body 32. As shown in FIGS. 2, 6 to 8, the outflow pipe connecting member 36 is mainly configured to have a flow passage reduction area (a cross-sectional area of the drainage passage) at the downstream side which is smaller than the upstream side (a cylindrical case is: Reduced diameter portion) 36S, body connection portion 36C. Then, the flow path reduction portion 36S is mainly configured to include a first flow path reduction portion 36A that serves as a downstream side wall portion from which the cross-sectional area of the flow path decreases from the upstream side to the downstream side, and is further upstream from the first flow path reduction portion 36A. The second flow path reduction portion 36B whose flow path cross-sectional area is reduced toward the downstream side. The first flow path reduction portion 36A is connected to the other end portion 32B on the downstream side of the storage tank body 32, and together with the storage tank body 32 and the inflow pipe connection member 34 (the wall portion 34A), the internal structure becomes a closed space. The outer shape of the first flow path reducing portion 36A is formed in a hemispherical shape protruding toward the downstream side in a side view and a plan view. Then, as shown in FIG. 8, at least a part of the inner wall surface 36E of the first flow path reduction portion 36A becomes a curved surface that protrudes (recesses) to the downstream side of the first flow path reduction portion 36A. In detail, in this embodiment, the inner wall surface 36E will be centered on the intersection point Pc of the boundary position between the first flow path reduction portion 36A and the main body connection portion 36C and the pipe axis C1, and the 2 One part is the radius R1, which is slightly consistent with the curve drawn to the downstream side.

The second flow path reduction portion 36B is disposed at a lower portion in the vertical direction of the first flow path reduction portion 36A, and is formed in a cylindrical tube shape extending in the direction of the tube axis C4 from the upstream side to the downstream side. The pipe axis C4 of the second flow path reducing portion 36B is located lower than the pipe axis C1 of the storage tank body 32 in a vertical direction, and is located vertically from the inner axis of the pipe shaft C1 and the other end portion 32B of the storage tank body 32. A position where the middle portion of P1 (see FIG. 8) is shifted toward the vertical position P1 side. As shown in FIG. 6 to FIG. 8, one end (not shown) on the upstream side of the second flow path reduction portion 36B is integrally formed in the first flow path reduction portion 36A. The downstream side of the second flow path reducing portion 36B extends from the upstream side toward the downstream side, and is integrally formed in a tubular outflow pipe connection portion 36J having a fixed flow passage cross-sectional area. The tube axis C4 is aligned with the outflow pipe connection portion 36J in the second flow path reduction portion 36B. The second flow path reduction portion 36B and the outflow pipe connection portion 36J allow the drainage from the inside 32C of the storage tank body 32 to flow out of the storage tank 30. The downstream side of the outflow pipe connection portion 36J becomes an outflow for drainage to the outside of the storage tank 30 口 OUT. The outflow port OUT is arranged to face the inflow port IN of the inflow pipe connection member 34 in this embodiment. The inflow inlet IN and the outflow outlet OUT are arranged at a lower position in the vertical direction than the tube axis C1 of the storage tank body 32. The outflow outlet OUT of the outflow pipe connection portion 36J is connected to one end portion 24A of the second pipe 24 shown in FIGS. 1 and 2.

As shown in FIG. 8, the tube axis C4 of the second flow path reduction portion 36B (and the outflow pipe connection portion 36J) is offset from the tube axis C1 of the storage tank body 32 as described above. Then, the position P5 on the upstream side end of the inner bottom portion 36G in the second flow path narrowed portion 36B extends toward the upstream side than the position P4 on the upstream side end of the inner upper portion 36H. In addition, the vertical position P3 of the inner bottom portion 36G of the second flow path reduction portion 36B is lower than the vertical position P1 of the bottom portion (inner bottom portion) of the inner portion 32C of the storage tank body 32. With this configuration, the cross-sectional area of the flow path on the upstream side of the second flow path reduction portion 36B can be enlarged, and the second flow path reduction portion 36B can increase the amount of liquid flowing out to the outflow port OUT. Specifically, the position P4 is the position on the most downstream side of the inner wall surface 36E of the first flow path reduction portion 36A. And the dimension L from this position P4 to the upstream side position P5 will extend out from the inner bottom 36G of the second flow path reduction portion 36B. The position P5 is located on the upstream side from the connection portion between the second flow path reduction portion 36B and the first flow path reduction portion 36A.

In particular, as shown in FIG. 8, the cross-sectional area of the flow path of the second flow path reduction portion 36B is expanded toward the upstream side. Specifically, the second flow path reduction portion 36B is an upstream opening portion (corresponding to the boundary portion with the first flow path reduction portion 36A) from the boundary portion with the outflow pipe connection portion 36J and the inner upper portion 36H is vertical. It expands toward the upper side. In the present embodiment, this expanded portion constitutes a curved branched wall surface 36D protruding toward the upstream side of the opening portion on the upstream side of the second flow path reduction portion 36B. The shunt wall surface 36D is centered on the intersection of the extension line of the tube axis C1 of the storage tank body 32 and the vertical line passing through the boundary portion between the second flow path reduction portion 36B and the outflow pipe connection portion 36J as the center position Po. The small size is the radius R2, which is consistent with the curve drawn to the upstream side.

As shown in FIGS. 6 to 8, the downstream side of the main body connection portion 36C is integrally formed on the periphery of the first flow path reduction portion 36A, and is formed to extend from the upstream side to the downstream side in accordance with the tube axis C1 of the storage tank body 32. Cylindrical. Similarly to the main body connection portion 34C of the inflow pipe connection member 34, the inner diameter is set to be the same as or slightly larger than the outer diameter of the storage tank body 32, and is configured to allow the other end portion 32B of the storage tank body 32 to be inserted. Go inside to connect. The boundary portion between the main body connection portion 36C and the first flow path reduction portion 36A is provided with a stepped vertical wall 36F which is smaller in diameter than the inner diameter of the main body connection portion 36C. In the body connecting portion 36C, the other end portion 32B of the storage tank body 32 can be inserted into the step. The vertical wall 36F and the stepped vertical wall 36F are used for positioning the assembly of the outflow pipe connecting member 36 to the storage tank body.

As shown in FIG. 8, when the other end portion 32B of the storage tank body 32 is assembled to the outflow pipe connection member 36 (connected state), the vertical position P1 of the inner bottom portion of the other end portion 32B is in the step vertical wall 36F. It is aligned with the vertical position (the symbol is omitted) of the bottom portion of the second flow path reduction portion 36B. That is, the drainage flow path from the storage tank body 32 to the flow path reduction portion 36S is configured so that there is no step portion.

The outflow pipe connection member 36 can be obtained using the same material and molding method as the inflow pipe connection member 34.

(Configuration of the first storage section 40 and the second storage section 50)

As shown in FIG. 2, the first storage section 40 and the second storage section 50 are arranged in parallel with each other in the horizontal direction with respect to the storage tank body 32 in parallel. The first storage section 40 is mainly composed of a storage tank body 42 having the same configuration as the storage tank body 32, an inflow tube connection member 44 having the same configuration as the inflow tube connection member 34, and an outflow having the same configuration as the outflow tube connection member 36. Tube connection member 46. In this embodiment, the inflow pipe connection portion (not shown) of the inflow pipe connection member 44 is connected to the first pipe 20 (not shown), and the overflow pipe connection portion 44D is connected through the overflow pipe (communication pipe) 60. To the overflow pipe connection portion 34D of the inflow pipe connection member 34. The outflow pipe connection structure 46 is connected to the second pipe 24.

The second storage section 50 is similar to the first storage section 40 in that it mainly includes a storage tank body 52 having the same structure as the storage tank body 32, an inflow pipe connection member 54 having the same structure as the inflow pipe connection member 34, and an outflow pipe. The connection member 36 is an outflow pipe connection member 56 having the same configuration. The inflow pipe connection portion (not shown) of the inflow pipe connection member 54 is connected to the first pipe 20 (not shown), and the overflow pipe connection portion 54D is connected to the overflow pipe connection portion 34D and the overflow through the overflow pipe 60. Flow tube connection 44D. The overflow pipe 60 has three connection parts connected to the overflow pipe connection parts 34D, 44D, and 54D, and the upstream side is connected to three connection parts (the symbol is omitted). In the plan view, an E-shape is used. Shaped piping. The outflow pipe connection member 56 is connected to the second pipe 24. In addition, the overflow pipe 60 may not be provided, and the overflow pipe connection portions 34D, 44D, and 54D may be directly connected.

As shown in FIG. 2, the overflow pipe 60 is connected to one end (the symbol is omitted) on the upstream side of the vent pipe 62. In detail, one end of the vent pipe 62 is connected to the overflow pipe connection portion 44D and the overflow pipe connection portion 54D. The middle part is connected to the overflow pipe 60. The other end portion on the downstream side of the overflow pipe 60 is connected to the second pipe in this embodiment. In addition, the ventilation duct 62 may not be provided, and internal air may be mutually circulated in the storage tank.

In addition, as shown in FIG. 2, the vertical height of the upstream side of the storage tank 30 is set to be slightly higher than the height H2 of the vertical side of the downstream side branch. That is, the storage tank 30 is inclined downward from the upstream side toward the downstream side in the vertical direction. With this structure, the liquid level (water level) of the outflow port OUT of the storage tank 30 can be raised to shorten the time required for the vertical pipe (the other end portion 24C of the second pipe 24) to be filled with water, and the siphon force can be shortened. Time required to start. Furthermore, the liquid in the storage tank 30 can be prevented from remaining.

The storage tank 30 according to the present embodiment is provided with three constituent members of a storage tank body 32, an inflow pipe connection member 34, and an outflow pipe connection member 36. An inflow hall connection member 34 is assembled upstream of the storage tank body 32 and an outflow pipe connection member 36 is assembled downstream of the storage tank body 32 to assemble the storage tank 30. In addition, the storage tank body 32, the inflow pipe connection member 34, and the outflow pipe connection member 36 may be integrally formed.

(Function and effect of this embodiment)

As shown in FIG. 2, the storage tank 30 according to the present embodiment, the storage tank body 32 is capable of storing drain water flowing from the upstream side to the inside 32C. A flow passage reduction portion 36S is provided on the downstream side of the storage tank body 32, and the flow passage reduction portion 36S is provided with an outflow port OUT (see FIG. 8) for draining water to the outside of the storage tank body 32.

Here, as shown in FIG. 8, a part of the flow path reduction portion 36S provided on the downstream side of the storage tank body 32 is provided with an inner wall surface 36E that protrudes toward the outside of the flow path reduction portion 36S (recessed and curved toward the downstream side). . As shown in FIG. 9, a part of the vertical lower portion of the drainage (liquid) F1 flowing from the upstream side to the downstream side of the storage tank body 32 passes through the flow path reduction portion 36S of the outflow pipe connection member 36 to become the drainage F2 toward the second side. The pipe 24 (see FIGS. 1 and 2) flows out. The other part of the vertical upper part of the drainage F1 that cannot flow out of the flow outlet OUT (refer to FIG. 8) of the flow path narrowing portion 36S will collide with the inner wall surface 36E (or the branch wall surface 36D) of the flow narrowing portion 36S and become the drain F3 Instead, it flows along the inner wall surface 36E.

FIG. 10 (A) shows a state where the storage tank 30 according to this embodiment is discharged on the downstream side when it is half full. In the figure, arrows indicate the flow of drainage in detail. As described above, the other part of the drainage F1 collides with the inner wall surface 36E of the first flow path reduction portion 36A of the flow path reduction portion 36S and becomes a drain. Water F1 flows along the inner wall surface 36E. As shown in FIG. 11 (A), similarly when the water is nearly full, the other part of the drainage F1 collides with the inner wall surface 36E, becomes the drainage F3, and flows along the inner wall surface 36E. In particular, as shown in FIG. 11 (A), the drainage F3 near the outflow port OUT (refer to FIG. 8) is guided along the inner wall surface 36E of the first flow path reduction portion 36A from the outflow port OUT to a position farther away from the vertical direction. direction. Therefore, the flow of the drainage F1 from the upstream side of the storage tank 30 toward the downstream discharge outlet OUT is not easily suppressed by the drainage F3 and the drainage F4 that cannot flow out of the outlet OUT. Therefore, according to the storage tank 30 related to this embodiment, the drainage F2 can be easily discharged from the outflow port OUT, and the outflow capacity of the drainage F2 can be improved.

On the other hand, in the storage tank 80 related to the second comparative example shown in FIGS. 10 (C) and 11 (C), the inner wall surface 86E of the first flow path reduction portion 86A of the outflow pipe connection member 86 is an upper portion. It is inclined toward the upstream side and has a flat shape. The storage tank 80 is not provided with a portion corresponding to the second flow path reduction portion 36B of this embodiment. The storage tank 80 is provided with an outflow pipe connection portion 86J corresponding to the outflow pipe connection portion 36J of the present embodiment. In the storage tank 80 related to the second comparative example, the other part of the drainage F1 will violently collide with the inner wall surface 86E whether it is half-full or near-full, and it will become a trapped drainage F5 due to turbulence and backflow. Therefore, the drainage F5 will hinder a part of the drainage F1 from flowing, making it difficult for the drainage F2 to flow out of the outflow pipe connection portion 86J toward the outflow, resulting in a smaller outflow of the drainage F2.

As shown in FIG. 8, in the storage tank 30 according to the present embodiment, in the outflow pipe connection member 36, the inner bottom 36G of the second flow path reduction portion 36B of the flow path reduction portion 36S is lower than the inner bottom of the storage tank body 32. To be low. In detail, the inner bottom portion 36G extends a distance L to the upstream position P4 from the most downstream side position P4 of the inner wall surface 36E, and the vertical position P3 of the inner bottom portion 36G is perpendicular to the inner bottom portion of the storage tank body 32. Position P1 should be low.

As shown in FIGS. 9, 10 (A), and 11 (A), the drainage F1 flowing from the upstream side to the downstream side of the storage tank body 32 in the flow path narrowing portion 36S changes its flow direction downward, making it difficult to collide. It reaches the inner wall surface 36E and passes through the second flow path reduction portion 36B (from the outflow port OUT) to become the drainage F2 and easily flows out of the storage tank body 32. Therefore, it is difficult to suppress the flow of the drainage F1 from the upstream side of the storage tank 30 to the downstream-side outflow outlet OUT due to the drainage F3 and the drainage F4 that cannot flow out of the outflow outlet OUT.

In addition, as shown in FIG. 5, the storage tank 30 related to this embodiment is provided with an inflow port IN on the upstream side of the storage tank body 32 (inflow hall connection member 34), so that the drainage can flow from the inflow port IN to the inside. 32C inflow. Since the inflow port IN is provided with the outflow port OUT downstream of the storage tank body 32 (outflow pipe connection member 36), the drainage F1 flowing from the inflow port IN flows straight toward the outflow port OUT. Here, as shown in FIG. 8, even if the drainage F1 flows linearly, the inner wall surface 36E of the flow path narrowing portion 36S is a curved surface protruding toward the downstream side. Therefore, as shown in FIGS. 9, 10 (A), and 11 (A ), It is difficult to suppress the flow of the drainage F2. Furthermore, since the flowing water F1 flows straight from the inflow inlet IN to the outflow outlet OUT, the tendency of the drainage F1 is not weakened, and the outflow of the drainage F2 can be increased.

As shown in FIG. 8, the storage tank 30 according to this embodiment has a flow path reduction portion 36S configured to include a first flow path reduction portion 36A on the storage tank body 32 side and a second flow path reduction on the outflow port OUT side. Department 36B. Here, the second flow path reducing portion 36B is formed in a tubular shape that expands toward the upstream side. That is, the cross-sectional area of the flow path on the upstream side of the second flow-path reduction portion 36B is larger than the cross-sectional area of the flow path on the downstream side. Therefore, the drainage F2 flowing into the second flow path reduction portion 36B is increased, and the amount of drainage F2 from the outflow port OUT can be increased. As shown in FIGS. 9, 10 (A), and 11 (A), since the amount of drainage F3 that cannot flow from the outflow port OUT decreases, it is difficult to flow the drainage F1 from the upstream side to the outflow port OUT. It is suppressed by the drainage F3 and drainage F4 which cannot flow out of the outflow port OUT.

Here, in the storage tank 70 related to the first comparative example shown in FIGS. 10 (B) and 11 (B), the outflow pipe connection member 76 includes a first flow path reduction portion 76A and an outflow pipe connection portion 76J, and flows out. The cross-sectional area of the flow passage of the pipe connection portion 76J is fixed. The portion corresponding to the second flow path reduction portion 36B of this embodiment is not provided in the storage tank 70. The inner wall surface 76E of the first flow path reduction portion 76A has the same curved surface as the inner wall surface of the first flow path reduction portion 36A of this embodiment shown in Figs. 10 (A) and 11 (A). In the storage tank 70 related to the first comparative example, since the drainage F1 mostly flows to the inner wall surface 76E side, the drainage F1 will collide with the inner wall surface 76E regardless of half-full water or near full water, and it is easy to become trapped drainage. F5. Therefore, the flow of the drainage F1 which is going to the outflow port OUT from the upstream side is easily suppressed by the drainage F5 which cannot flow out of the outflow port OUT.

Furthermore, in the storage tank 30 according to this embodiment, as shown in FIG. 8, a split wall surface 30D is formed at an opening on the upstream side of the second flow path reduction portion 36B, and the split wall surface 36D protrudes toward the storage tank body 32 side. (A curved shape protruding toward the upstream side). Therefore, the flow direction of the drain F2 that hits the shunt wall surface 36D will not change sharply, but will gradually change toward the outflow port OUT. Therefore, the drain F2 that hits the shunt wall surface 36D can be allowed to flow without staying near the shunt wall surface 36D. The outlet OUT flows out. As a result, it is difficult for the drain F1 flowing toward the outflow port OUT from the upstream side to be suppressed by the drain F3 and the drain F4 that cannot flow out of the outflow port OUT.

Here, the storage tank 70 related to the first comparative example shown in FIGS. 10 (B) and 11 (B) is not provided with the shunt wall surface 36D of this embodiment. In the storage tank 70 related to the first comparative example, the flow rate of the drain F1 toward the inflow port IN is returned to the drain F5. Therefore, the drain F1 that is intended to flow from the upstream side toward the outflow port is half-full or nearly full. The flow is easily suppressed by the drainage F5 that cannot flow out of the outflow port OUT.

In addition, in the storage tank 30 of this embodiment, as shown in FIG. 8, the cross-sectional area of the flow channel near the opening on the upstream side of the second flow reduction portion 36B becomes larger upward in the vertical direction, so that the drainage F2 is caused by the vertical direction due to its weight. The speed of the component is increased, so that the outflow amount of the drainage F2 from the second flow path narrowing portion 36B can be increased. Therefore, the outflow of the drain F2 from the second flow path reduction portion 36B can be increased, and the flow rate of the drain F3 toward the inner wall surface 36E side, which is the main cause of turbulence or counterflow, can be reduced.

Furthermore, as shown in FIG. 2, in the storage tank 30 related to this embodiment, when the storage capacity of the storage tank body 32 is exceeded, the drainage can be allowed to overflow to the first storage section 40 and the second storage section 50. Therefore, the first storage section 40 and the second storage section 50 can make up the storable drainage amount.

As shown in FIG. 1, the siphon type drainage system 10 according to this embodiment includes a storage tank 30, a first pipe 22, and a second pipe 24. The first pipe 22 flows the drainage from the water appliance 14 into the inside of the storage tank 30 (the inside 32C of the storage tank body 32). When the inflow of the drainage F1 in the storage tank 30 is greater than the outflow of the drainage F2 from the outflow port OUT, the inflow drainage F1 is stored in the storage tank 30. The stored drainage F1 is discharged from the outflow port OUT of the storage tank 30 through the second pipe 24. Therefore, in the storage tank 30, since the flow of the drain F1 which is going from the upstream side toward the outflow port OUT is not easily suppressed by the drain F3 and the drain F4 which cannot flow out of the outflow port OUT, the outflow amount of the drain F2 can be increased. Therefore, the time required for the vertical pipe (from the middle portion 24B to the other end portion 24C) of the second pipe 24 to be filled with water can be shortened, and the time required to start the siphon force can be shortened.

Furthermore, as shown in FIG. 8, the outflow pipe connection member 36 according to this embodiment is provided with a first flow path reduction portion 36A, and the first flow path reduction portion 36A has a curved inner wall surface recessed toward the downstream side. 36E. Then, the first flow path reducing portion 36A is provided with an outflow port OUT for allowing the drain water F1 to flow out of the storage tank body 32. Here, the outflow pipe connection member 36 may be assembled on the downstream side of the storage tank body 32. Therefore, the outflow pipe connection member 36 is assembled in the storage tank body 32, and the The storage tank 30 that does not obstruct the outflow of the drain F2 of the outflow port OUT due to turbulence or backflow is easily produced.

Further, as shown in FIG. 8, the outflow pipe connecting member 36 according to the present embodiment includes a flow passage reduction portion 36S, an outlet port OUT, and an inner wall surface 36E protruding outward from the flow passage reduction portion 36S. Here, the outflow pipe connection member 36 may be assembled on the downstream side of the storage tank body 32. Therefore, the outflow pipe connection member 36 can be assembled in the storage tank body 32, and the drain F1 flowing from the upstream side toward the outflow port OUT can be easily produced, and the flow of the drain F1 which cannot flow out of the outflow port OUT can be easily suppressed. Storage tank 30.

In addition, as shown in FIG. 8, the outflow pipe connection member 36 according to this embodiment includes a flow passage reduction portion 36S and an outflow outlet OUT. The inner bottom portion 36G of the flow passage reduction portion 36S is lower than the inner bottom portion of the storage tank body 32. . Here, the outflow pipe connection member 36 may be assembled on the downstream side of the storage tank body 32. Therefore, the outflow pipe connection member 36 can be assembled in the storage tank body 32, and the drain F1 flowing from the upstream side toward the outflow port OUT can be easily produced, and the flow of the drain F1 which cannot flow out of the outflow port OUT can be easily suppressed. Storage tank 30.

Therefore, the storage tank 30, the siphonic drainage system 10, and the outflow pipe connection member 36 related to this embodiment can allow the drainage F2 to easily flow out of the outflow port OUT, thereby increasing the outflow of the drainage F2.

[Second Embodiment]

A storage tank 30 according to a second embodiment of the present invention will be described with reference to FIG. 12. In addition, in the description of this embodiment and the third embodiment described later, the same reference numerals are given to the structures having the same function in the storage tank 30 related to the first embodiment, and redundant description is omitted.

As shown in FIG. 12 (A), in the storage tank 30 according to the present embodiment, in the outflow pipe connection member 36, the first flow passage reduction portion 36A of the flow passage reduction portion 36S is formed so as to project toward the downstream side in a plan view. Semi-cylindrical. Although the illustration is omitted, the inner wall surface of the first flow path reduction portion 36A is recessed and curved toward the downstream side. The second flow path reduction portion 36B is integrally formed at the lowermost side of the first flow path reduction portion 36A in the vertical direction. The storage tank body 32 has a rectangular tube shape in the present embodiment.

As shown in FIG. 12 (B), in the storage tank 30 related to the first modification example, in the outflow pipe connection member 36, the first flow passage reduction portion 36A of the flow passage reduction portion 36S is formed to be downstream from the side view. Protruding semi-cylindrical. Although the illustration is omitted, the inner wall surface of the first flow path reduction portion 36A is concave toward the downstream side. Settled into a curved shape. The second flow path reduction portion 36B is integrally formed at the middle portion in the vertical direction on the most downstream side of the first flow path reduction portion 36A.

As shown in FIG. 12 (C), in the storage tank 30 according to the second modification example, in the outflow pipe connection member 36, the first flow passage reduction portion 36A of the flow passage reduction portion 36S is formed to protrude downstream in a plan view. Half-cylindrical. Although the illustration is omitted, the inner wall surface of the first flow path reduction portion 36A is recessed and curved toward the downstream side. The second flow path reduction portion 36B is integrally formed at the lowermost side of the first flow path reduction portion 36A in the vertical direction.

As shown in FIG. 12 (D), in the storage tank 30 according to the third modification example, in the outflow pipe connection member 36, the first flow passage reduction portion 36A of the flow passage reduction portion 36S is formed to protrude downstream in a plan view. It is semi-cylindrical, and the upper part of the first flow path reduction part 36A is inclined downward from the storage tank body 32 toward the second flow path reduction part 36B in the vertical direction. Although the illustration is omitted, the inner wall surface of the first flow path reduction portion 36A is provided with a portion that is recessed and curved toward the downstream side. The second flow path reduction portion 36B is connected to the lower portion in the vertical direction at the most downstream side of the first flow path reduction portion 36A.

As shown in FIG. 12 (E), in the storage tank 30 according to the third modification, the first flow passage reduction portion 36A of the flow passage reduction portion 36S is formed in the outflow pipe connection member 36 so as to protrude downstream in a plan view. M shape with 2 semi-cylindrical parts. Although the illustration is omitted, the inner wall surface of the first flow path reduction portion 36A is provided with two portions that are recessed toward the downstream side and are curved. Although not clearly shown in FIG. 12 (E), a second flow path reduction portion 36B is provided between the first flow path reduction portion 36A and the outflow pipe connection portion 36J. The second flow path reduction portion 36B is integrally formed between the semi-cylindrical portions on the most downstream side of the first flow path reduction portion 36A.

(Function and effect of this embodiment)

The storage tank 30 according to this embodiment can obtain the same operational effects as those obtained by the storage tank 30 according to the first embodiment described above. The siphonic drainage system 10 and the outflow pipe connection member 36 can also obtain the same effect.

In addition, in the storage tank 30 related to the present embodiment and the first to fourth modification examples, a composite surface combining a flat surface and a curved surface may be used to form the inner wall surface of the first flow path reduction portion 36A of the outflow pipe connection member 36. (36E). Therefore, it is possible to easily form the inner wall surface 36E (see FIG. 8) that allows the drainage F2 to easily flow out.

[Third Embodiment]

A storage tank 30 according to a third embodiment of the present invention will be described with reference to FIG. 13.

As shown in FIG. 13 (A), in the storage tank 30 according to this embodiment, in the outflow pipe connection member 36, the inner wall surface 36E of the first flow passage reduction portion 36A of the flow passage reduction portion 36S uses a changing angle to make the complex plane FS is continuous on multiple sides to form a curved shape that is recessed toward the downstream side.

As shown in FIG. 13 (B), in the storage tank 30 related to the fifth modification example, in the outflow pipe connection member 36, the inner wall surface 36E of the flow path reduction portion 36S is a composite surface using a combination plane FS and a plurality of curved surfaces CS (multifaceted). To form a curved shape that is recessed toward the downstream side. In the fifth modification, the most downstream side of the inner wall surface 36E is a plane FS.

As shown in FIG. 13 (C), in the storage tank 30 related to the sixth modification example, in the outflow pipe connection member 36, the inner wall surface 36E of the flow path reduction portion 36S is a composite surface using a combination curved surface CS and a complex plane FS (multi-faceted) To form a curved shape recessed toward the downstream side. In the sixth modification, the most downstream side of the inner wall surface 36E is a curved surface CS.

(Function and effect of this embodiment)

The storage tank 30 according to this embodiment can obtain the same operational effects as those obtained by the storage tank 30 according to the first embodiment described above. The siphonic drainage system 10 and the outflow pipe connection member 36 can also obtain the same effect.

In the storage tank 30 related to the present embodiment, the fifth modification, and the sixth modification, as shown in FIGS. 13 (A) to 13 (C), a combination of multiple faces (complex plane FS), plane FS, and The compound surface of the curved surface CS forms the inner wall surface (36E) of the first flow path reduction portion 36A of the outflow pipe connection member 36. Therefore, the inner wall surface 36E which allows the drainage F2 to easily flow out can be simply formed.

[Other forms]

The present invention is not limited to the above-mentioned embodiment, and various changes can be made without departing from the scope of the gist. For example, in the above-mentioned embodiment, the first flow path reduction portion 36A, the second flow path reduction portion 36B, and the outflow tube connection portion 36J of the outflow pipe connection member 36 are integrally formed. However, the present invention can also be used as separate components. Instead, they are assembled with each other to form the outflow pipe connection member 36. In addition, in the above embodiment, although the storage tank body 32 is cylindrical or rectangular, the present invention may be oval, trapezoidal, or polygonal, and the cross-sectional shape of the storage tank body 32 is not limited. . Furthermore, the present invention is not limited to the siphon type drainage system 10, and can also be widely applied to storage tanks for storing liquids.

Claims (6)

A storage tank is provided with: a storage tank body that can store liquid flowing from the upstream side into the interior; a flow channel reduction portion that is provided on the downstream side of the storage tank body, and the cross-sectional area of the flow channel on the downstream side is smaller The upstream side should be small; the outflow port is provided on the downstream side of the reduced portion of the flow channel to allow the liquid to flow out of the storage tank body; and the inner wall surface is provided on a portion of the reduced portion of the flow channel and faces the The outer side of the reduced flow channel portion protrudes; the reduced flow channel portion includes a first reduced flow channel portion on the storage tank body side and a second reduced flow channel portion on the outlet side; the flow outlet is formed by A tubular outflow pipe connecting portion extending from the second channel narrowing portion to the downstream side is formed; the outer shape of the first channel narrowing portion is formed in a hemispherical shape protruding toward the downstream side in a side view and a plan view; The inner wall surface has a curved surface provided on the first flow path reduction portion and protruding toward the outside of the first flow path reduction portion. For example, the storage tank of the first scope of the application for a patent, wherein the storage tank is provided with an inlet for the liquid to flow into the interior of the storage tank. For example, the storage tank of the first or second scope of the patent application, wherein the second flow path reduction portion is formed with a shunt wall surface protruding toward the storage tank body side. For example, if the storage tank of item 1 or 2 of the patent scope is applied, the storage tank body is provided with other storage tanks connected by a communication port on the upstream side. The other storage tanks will allow the overflow of the storage tank body from the storage tank body. The liquid flows out. A siphon-type drainage system is provided with: the storage tank as in any one of claims 1 to 4 of the scope of patent application; a first piping connecting a water appliance to the upstream side of the storage tank; and a second piping, The outflow port connected to the storage tank has a standpipe which flows out the liquid to a position lower than the outflow port. An outflow pipe connection member capable of being assembled to be capable of storing liquid flowing from the upstream side to the inside The outflow pipe connection member on the downstream side of the storage tank body is provided with: a reduced flow path portion, which is provided on the downstream side, and the cross-sectional area of the flow channel on the downstream side is smaller than that on the upstream side; The downstream side of the channel narrowing portion allows the liquid to flow out of the channel narrowing portion; and the inner wall surface is provided on a part of the channel narrowing portion and protrudes toward the outside of the channel narrowing portion; the channel narrows The system is constituted by a first channel narrowing portion on the storage tank body side and a second channel narrowing portion on the outlet side. The outlet is extended downstream from the second channel narrowing portion. It is formed by a tubular outflow pipe connecting portion; the outer shape of the first flow channel reduction portion is formed in a hemispherical shape protruding toward the downstream side in a side view and a plan view; and the inner wall surface is provided with a reduction in the first flow channel. And a curved surface that protrudes toward the outside of the first flow path reducing portion.