WO2016088464A1

WO2016088464A1 - Storage tank, siphon-type drainage system, and outflow-pipe connection member

Info

Publication number: WO2016088464A1
Application number: PCT/JP2015/079712
Authority: WO
Inventors: 秀司豊田
Original assignee: 株式会社ブリヂストン
Priority date: 2014-12-02
Filing date: 2015-10-21
Publication date: 2016-06-09
Also published as: JP6454527B2; JP2016108749A; TWI672417B; TW201632690A; CN107002396B; CN107002396A

Abstract

This storage tank is provided with: a storage-tank main body (32) capable of storing a liquid flowing into the inside thereof from the upstream side; a flow-path reduction part (36S) which is provided to the downstream side of the storage-tank main body (32), and has a flow path cross-sectional area at the downstream side which is smaller than that at the upstream side; an outlet (OUT) which is provided to the downstream side of the flow-path reduction part (36S), and which allows the liquid to flow out to the exterior of the storage-tank main body (32); and an inner wall surface (36E) which is provided to a section of the flow-path reduction part (36S), and which protrudes towards the outside of the flow-path reduction part (36S). The storage tank is used to build a siphon-type drainage system. An outflow-pipe connection member (36) is provided with the flow-path reduction part (36S) and the outlet (OUT), and is attached to the storage-tank main body (32).

Description

Storage tank, siphon drainage system and outflow pipe connection member

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

The following Patent Document 1 discloses a siphon drainage system. In the siphon drainage system, a watering device is connected to the upstream side of the horizontal pipe, and the downstream side of the horizontal pipe is connected to the standing pipe with a drop with respect to the upstream side. Thereby, drainage is made from the watering device to the vertical pipe using the siphon force. The siphon drainage system is provided with a rectangular storage tank (chamber) as a water storage means upstream of the horizontal pipe. The storage tank is configured to temporarily store the drainage when there is a large amount of drainage at once from the watering device.

JP 2006-336322 A

In the siphon drainage system, the wastewater that has flowed into the storage tank collides with the wall near the outlet, and the drainage of the wastewater from the outlet is hindered. For this reason, there was room for improvement because the outflow of wastewater decreased.

The present invention has been made in consideration of the above facts, and an object of the present invention is to obtain a storage tank, a siphon drainage system, and an outflow pipe connecting member that can easily allow the liquid to flow out from the outflow port and increase the outflow amount of the liquid.

The storage tank according to the first embodiment of the present invention is provided on the downstream side of the storage tank body, the storage tank main body in which the liquid flowing into the inside from the upstream side can be stored, and more downstream than the upstream side. A flow path reduction section having a small flow path cross-sectional area; an outlet provided on the downstream side of the flow path reduction section; and an outlet for allowing liquid to flow out of the storage tank body; and a part of the flow path reduction section. And an inner wall surface that bulges outward from the reduced portion.

In the storage tank according to the first embodiment, the storage tank body can store the liquid that has flowed into the interior from the upstream side. A flow path reducing portion is provided on the downstream side of the storage tank main body, and an outlet for allowing the liquid to flow out of the storage tank main body is provided on the downstream side of the flow path reducing portion.

Here, an inner wall surface bulging to the outside of the flow path reducing portion is provided in a part of the flow path reducing portion. The liquid that has flowed from the upstream side to the downstream side of the storage tank body and has not flown out of the outlet is guided along the inner wall surface in a direction away from the outlet. For this reason, it is difficult for the liquid flow from the upstream side to the outlet to be suppressed by the liquid that has not flowed out of the outlet.

In the storage tank according to the second embodiment of the present invention, in the storage tank according to the first embodiment, the inner wall surface has a curved surface that bulges outside the flow path reduction portion.

According to the storage tank according to the second embodiment, since the inner wall surface has a curved surface that bulges outside the flow path reducing portion, it flows from the upstream side to the downstream side of the storage tank body and does not flow out from the outlet. The liquid is smoothly guided along the curved surface of the inner wall surface in a direction away from the outlet. For this reason, it is difficult for the liquid flow from the upstream side to the outlet to be suppressed by the liquid that has not flowed out of the outlet.

In the storage tank according to the third embodiment of the present invention, in the storage tank according to the first embodiment or the second embodiment, the storage tank main body is provided with an inlet for allowing the liquid to flow into the storage tank, facing the outlet. .

According to the storage tank according to the third embodiment, the inlet is provided on the upstream side of the storage tank body, and the liquid flows into the inside from the inlet. Since the inflow port is provided to face the outflow port, the liquid flowing in from the inflow port flows linearly toward the outflow port. Here, even if the liquid flows linearly, the liquid flow from the upstream side toward the outlet is hardly suppressed by the liquid that has not flowed out of the outlet.

In the storage tank according to the fourth embodiment of the present invention, in the storage tank according to any one of the first embodiment to the third embodiment, the flow path reducing portion is a first flow path reducing portion on the storage tank main body side. A second flow path reducing portion on the outflow side, and the outflow port is formed by a tubular outflow pipe connecting portion extending from the second flow path reducing portion to the downstream side.

According to the storage tank according to the fourth embodiment, the flow path reduction section includes the first flow path reduction section on the storage tank main body side and the second flow path reduction section on the outlet side. The outflow port is formed by a tubular outflow pipe connecting portion extending downstream from the second flow path reducing portion. That is, the flow path cross-sectional area of the second flow path reducing portion is made larger than the flow path cross-sectional area of the outflow pipe connecting portion. For this reason, the amount of liquid flowing into the second flow path reducing portion increases, and the amount of liquid flowing out from the outlet can be increased. In addition, since the amount of liquid that does not flow out from the outlet decreases, the liquid flow from the upstream side toward the outlet becomes difficult to be suppressed by the liquid that has not flowed out of the outlet.

In the storage tank according to the fifth embodiment of the present invention, in the storage tank according to the fourth embodiment, a diversion wall surface that bulges toward the storage tank body is formed in the second flow path reduction portion.

According to the storage tank according to the fifth embodiment, the diversion wall surface is formed in the second flow path reduction portion, and the diversion wall surface is bulged toward the storage tank main body. For this reason, the direction of the flow of the liquid hitting the flow dividing wall does not change abruptly and gradually changes toward the outlet, so that the liquid hitting the flow dividing wall does not stay in the vicinity of the flow dividing wall and goes to the outlet. Can be drained. As a result, the liquid flow from the upstream side toward the outlet is hardly suppressed by the liquid that has not flowed out of the outlet.

The storage tank according to the sixth embodiment of the present invention is the storage tank according to any one of the first to fifth embodiments, and is another storage tank communicated with the upstream side of the storage tank main body through the communication port. The liquid overflowed from the storage tank main body flows out to other storage tanks.

In the storage tank according to the sixth embodiment, when the storage capacity of the storage tank main body is exceeded, the liquid can overflow into the other storage tank, so that the storable flow rate can be supplemented by the other storage tank. .

A siphon-type drainage system according to a seventh embodiment of the present invention is a first tank that connects a storage tank according to any one of the first to sixth embodiments, a watering device, and an upstream side of the storage tank. A pipe and a second pipe connected to the outlet of the storage tank and having a soot pipe that allows the liquid to flow out to a position lower than the outlet.

The siphon drainage system according to the seventh embodiment includes a storage tank, a first pipe, and a second pipe. The first pipe allows the liquid from the watering device to flow into the storage tank. If the inflow amount of liquid is larger than the outflow amount of liquid from the outlet of the storage tank, the inflowed liquid is stored in the storage tank. The stored liquid is discharged from the outlet of the storage tank through the second pipe. Here, in the storage tank according to the first to sixth embodiments, the liquid flow from the upstream side to the outlet is difficult to be suppressed by the liquid that has not flowed out of the outlet, so the amount of liquid outflow is increased. be able to. For this reason, it is possible to reduce the time required until the second pipe of the second pipe is full, and the time required to activate the siphon force can be reduced.

The outflow pipe connecting member according to the eighth embodiment of the present invention can be assembled to the downstream side of the storage tank body in which the liquid flowing into the inside from the upstream side can be stored, and is provided on the downstream side. A flow path reduction section having a smaller flow path cross-sectional area on the downstream side than the flow path; an outlet provided on the downstream side of the flow path reduction section; And an inner wall surface bulging to the outside of the flow path reduction portion.

The outflow pipe connecting member according to the eighth embodiment includes a flow path reducing portion, an outflow port, and an inner wall surface that bulges outside the flow path reducing portion. Here, the outflow pipe connecting member can be assembled on the downstream side of the storage tank main body. For this reason, it becomes possible to easily manufacture a storage tank in which the outflow pipe connecting member is assembled to the storage tank main body and the liquid flow from the upstream side toward the outlet is not easily suppressed by the liquid that has not flowed out of the outlet.

The storage tank, siphon drainage system and outflow pipe connecting member according to the present invention have an excellent effect that the liquid can easily flow out from the outflow port and the outflow amount of the liquid can be increased.

1 is a schematic side view of a siphon drainage system according to a first embodiment of the present invention. It is a perspective view of the storage tank of the siphon-type drainage system shown by FIG. It is a side view of the inflow pipe connection member which can be assembled | attached to the storage tank shown by FIG. FIG. 4 is a plan view of the inflow pipe connecting member shown in FIG. 3. 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 AA in FIG. 4). It is a side view of the outflow pipe connection member which can be assembled | attached to the storage tank shown by FIG. It is a top view of the outflow pipe connection member shown by FIG. FIG. 8 is a cross-sectional view of the outflow pipe connecting portion shown in FIGS. 6 and 7 (cross-sectional view taken along line BB in FIG. 7). FIG. 8 is a cross-sectional perspective view of the outflow pipe connecting portion shown in FIGS. 6 and 7. (A) The typical side view which shows the outflow state of the liquid at the time of the half-full water of the storage tank which concerns on 1st Embodiment, (B) The outflow state of the liquid of the same flow rate of the storage tank which concerns on a 1st comparative example. The schematic side view to show, (C) The typical side view which shows the outflow state of the liquid of the same flow volume of the storage tank which concerns on a 2nd comparative example. (A) The typical side view which shows the outflow state of the liquid when the storage tank which concerns on 1st Embodiment is near at the time of full water, (B) The outflow state of the liquid of the same flow rate of the storage tank which concerns on a 1st comparative example is shown. It is a typical side view, (C) It is a typical side view which shows the outflow state of the liquid of the same flow volume of the storage tank which concerns on a 2nd comparative example. (A) Schematic perspective view of storage tank and outflow pipe connection member according to second embodiment of the present invention, (B) to (E) Storage tank and outflow pipe connection according to first to fourth modifications It is a typical perspective view of a member. (A) The typical sectional view which looked at the inner wall surface of the wall part of the outflow pipe connection member of the storage tank concerning a 3rd embodiment of the present invention from the side, (B) ( It is a typical sectional view corresponding to (A) of an inner wall surface concerning the (C) 6th modification.

[First Embodiment]
The storage tank, siphon drainage system, and outflow pipe connecting member according to the first embodiment of the present invention will be described with reference to FIGS. Here, in the drawing, an arrow X appropriately shown indicates a flow path direction from the upstream side to the downstream side in the horizontal direction, and an arrow Y indicates a direction orthogonal to the flow path direction in the horizontal direction. An arrow Z indicates the upper side in the direction perpendicular to the flow path direction. The application direction of the storage tank, siphon drainage system, and outflow pipe connecting member according to the first to third embodiments is not limited.

(Configuration of siphon drainage system 10)
As shown in FIG. 1, a siphon drainage system 10 according to the present embodiment includes a watering device 14 disposed on a slab 12 of a building, a first pipe 22, a storage tank 30, and a second tank. A pipe 24 and a standing pipe 28 are provided as main components.

In the present embodiment, the watering device 14 includes a bathtub 16, a washing place 18, a drain pipe 20A, and a drain trap 20B. The watering device 14 is disposed on the upstream side of the storage tank 30 in the liquid channel, here, the drainage channel for drainage. Note that the configuration of the watering device 14 is not limited to this example. The first pipe 22 is piped on the slab 12 in a substantially horizontal state. One end portion on the upstream side of the first pipe 22 is connected to the drain trap 20B of the watering device 14, and the downstream side of the first pipe 22 is connected to the storage tank 30.

The second pipe 24 is piped downstream from the storage tank 30. One end 24 A on the upstream side of the second pipe 24 is connected to the storage tank 30, and a pipe from the one end 24 A to the intermediate part 24 B of the second pipe 24 is piped on the slab 12 in a substantially horizontal state. The other end 24C on the downstream side of the second pipe 24 is piped downward along a vertical pipe 28 extending vertically downward from the intermediate part 24B as a soot pipe, and the storage tank 30 and one end 24A Is connected to the standpipe 28 with a drop H1 at a connection position lower than the connection position. A merging joint 26 is used for this connection.

In the siphon drainage system 10, drainage is possible from the watering device 14 to the standing pipe 28 via the first pipe 22, the storage tank 30, the second pipe 24 and the junction joint 26. Siphon power can be used for drainage. Further, when a large amount of drainage is made at once from the watering device 14, the drainage can be temporarily stored in the storage tank 30.

(Configuration of storage tank 30)
As shown in FIG. 2, the storage tank 30 includes a storage tank main body 32, an inflow pipe connection member 34, and an outflow pipe connection member 36 as main components. Furthermore, the storage tank 30 has a first storage section 40 and a second storage section 50 as other storage tanks that temporarily store the waste water that exceeds the storage capacity of the storage tank body 32 when viewed from the storage tank body 32. Is provided. In the present embodiment, the storage tank 30 is provided with the two first storage units 40 and the second storage unit 50, but according to the flow rate of the drainage flowing into the siphon drainage system 10 per certain time. The number of other storage tanks can be increased or decreased. For example, when the drainage capacity is small, the first storage unit 40 is provided in the storage tank 30. When the drainage capacity is large, in addition to the first storage unit 40 and the second storage unit 50, some storage units are provided in the storage tank 30.

(Configuration of storage tank body 32)
The storage tank main body 32 is formed in a cylindrical tubular 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 main body 32 has a diameter larger than that of the first pipe 22 and the second pipe 24, and is configured to be able to temporarily store wastewater that has flowed into the interior 32C of the storage tank main body 32 from the upstream side.

(Configuration of inflow pipe connecting member 34)
The inflow pipe connecting member 34 can be assembled on the upstream side of the storage tank main body 32. As shown in FIGS. 2 to 5, the inflow pipe connecting member 34 mainly includes a wall part (upstream side wall part) 34A, an inflow pipe connection part 34B, a main body connection part 34C, and an overflow pipe connection part 34D. It is prepared as a simple configuration. The wall portion 34A is configured to close the one end portion 32A on the upstream side of the storage tank main body 32 and make the interior 32C a closed space together with the storage tank main body 32 and the outflow pipe connecting member 36 (the flow path reducing portion 36A). . The wall portion 34A is formed in a shape protruding to the upstream side.

The inflow pipe connecting portion 34B is disposed in the lower part of the wall portion 34A in the vertical direction, and is formed in a cylindrical tube extending along the pipe axis C2 direction from the downstream side toward the upstream side. The pipe axis C2 of the inflow pipe connecting portion 34B is positioned lower than the pipe axis C1 of the storage tank main body 32 in the vertical direction, and the vertical position P1 between the pipe axis C1 and the inner bottom portion of the one end 32A of the storage tank main body 32 (see FIG. 5)). One end (reference numeral omitted) of the upstream side of the inflow pipe connecting portion 34B is connected to the other end of the first pipe 20 shown in FIGS. The other end portion (not shown) on the downstream side of the inflow pipe connecting portion 34B is formed integrally with the wall portion 34A as shown in FIGS. The upstream side of the inflow pipe connection portion 34B is an inflow port IN through which wastewater flows from the first pipe 22 through the inflow pipe connection portion 34B into the interior 32C of the storage tank main body 32.

The main body connection portion 34C is formed in a cylindrical tube whose upstream side is integrally formed with the peripheral edge of the wall portion 34A and extends from the upstream side toward the downstream side in the direction of the tube axis C1 of the storage tank main body 32. The main body connecting portion 34C is configured such that the inner diameter is set to be equal to or slightly larger than the outer diameter of the storage tank main body 32, and one end 32A of the storage tank main body 32 is inserted and connected. A stepped vertical wall 34F having a diameter smaller than the inner diameter of the main body connecting portion 34C is provided at a boundary portion 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). Yes. One end portion 32A of the storage tank main body 32 can be inserted up to the step vertical wall 34F inside the main body connection portion 34C, and the step vertical wall 34F is used for positioning the inflow pipe connecting member 34 to the storage tank main body 32. .

Here, as shown in FIG. 5, when the one end portion 32 A of the storage tank body 32 is assembled to the inflow pipe connecting member 34 (connected state), the vertical position P 1 of the inner bottom portion of the one end portion 32 A is inflow. It coincides with the vertical position P2 of the inner bottom portion of the pipe connecting portion 34B. That is, a step portion is not generated in the drainage flow path from the inflow pipe connecting portion 34B to the storage tank main body 32.

The overflow pipe connecting part 34D is disposed in the upper part of the wall part 34A in the vertical direction and is formed in a cylindrical tube extending along the pipe axis C3 from the downstream side toward the upstream side. The tube axis C3 is positioned vertically above the tube axis C1 of the storage tank body 32, and is intermediate between the tube axis C1 and the vertical position P6 (see FIG. 5) of the upper portion in the tube of the one end portion 32A of the storage tank body 32. Located in the department. One end portion (reference numeral omitted) of 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. The other end portion (not shown) on the downstream side of the overflow pipe connecting portion 34D is formed integrally with the wall portion 34A as shown in FIGS. The downstream side of the overflow pipe connection portion 34D is a communication port OF that communicates with the first storage portion 40 and the second storage portion 50 that allow the waste water from the interior 32C of the storage tank body 32 to overflow.

Since the inflow pipe connecting member 34 has a complicated structure including the inflow pipe connecting portion 34B and the like, the inflow pipe connecting member 34 is formed by, for example, injection molding using a resin material such as vinyl chloride.

(Configuration of outflow pipe connecting member 36)
The outflow pipe connecting member 36 can be assembled on the downstream side of the storage tank main body 32. As shown in FIG. 2 and FIG. 6 to FIG. 8, the outflow pipe connecting member 36 has a flow path reduction portion (in the case of a cylindrical shape) having a smaller flow path cross-sectional area (drainage cross-sectional area) on the downstream side than on the upstream side. A reduced-diameter portion) 36S and a main body connection portion 36C are provided as main components. The flow path reducing portion 36S includes a first flow path reduced portion 36A as a downstream side wall portion whose flow path cross-sectional area is reduced from the upstream side toward the downstream side, and further upstream than the first flow path reduced portion 36A. A second flow path reducing portion 36B having a flow path cross-sectional area reduced from the side toward the downstream side is provided as a main configuration. 36 A of 1st flow path reduction parts are connected to the other end part 32B of the downstream of the storage tank main body 32, and the structure which makes the internal 32C closed space with the storage tank main body 32 and the inflow pipe connection member 34 (wall part 34A). It is said that. The outer shape of the first flow path reducing portion 36A is formed in a hemispherical shape that protrudes downstream in a side view and a plan view. As shown in FIG. 8, at least a part of the inner wall surface 36E of the first flow path reducing portion 36A is a curved surface that bulges (dents) outside the first flow path reducing portion 36A and downstream. It is said that. More specifically, in the present embodiment, the inner wall surface 36E has a central position Pc at the intersection of the boundary position between the first flow path reduction portion 36A and the main body connection portion 36C and the tube axis C1, and the tube of the storage tank main body 32. One half of the diameter is defined as radius R1, which is substantially coincident with the curve drawn on the downstream side.

The second flow path reduction part 36B is disposed in the lower part of the first flow path reduction part 36A in the vertical direction, and is formed in a cylindrical tube extending along the tube axis C4 direction from the upstream side toward the downstream side. . The tube axis C4 of the second flow path reducing portion 36B is positioned lower than the tube axis C1 of the storage tank body 32 in the vertical direction, and the vertical position of the tube shaft C1 and the inner bottom portion of the other end 32B of the storage tank body 32. It is located offset from the intermediate portion with P1 (see FIG. 8) toward the vertical position P1. One end (reference numeral omitted) of the upstream side of the second flow path reducing portion 36B is formed integrally with the first flow path reducing portion 36A, as shown in FIGS. The downstream side of the second flow path reducing portion 36B is integrally formed with a tubular outflow pipe connecting portion 36J extending from the upstream side toward the downstream side and having a constant flow path cross-sectional area. The tube axis C4 coincides with the second flow path reducing portion 36B and the outflow tube connecting portion 36J. The second flow path reduction part 36 B and the outflow pipe connection part 36 J allow the waste water from the inside 32 C of the storage tank body 32 to flow out of the storage tank 30. The downstream side of the outflow pipe connecting portion 36J is an outlet OUT that allows the drainage to flow out of the storage tank 30. In the present embodiment, the outflow port OUT is disposed to face the inflow port IN of the inflow pipe connecting member 34. The inflow port IN and the outflow port OUT are arranged at a lower portion in the vertical direction than the tube axis C1 of the storage tank main body 32. The outflow port OUT of the outflow pipe connection portion 36J is connected to one end 24A of the second pipe 24 shown in FIGS.

8, the tube axis C4 of the second flow path reducing portion 36B (and the outflow tube connecting portion 36J) is offset with respect to the tube axis C1 of the storage tank main body 32 as described above. The position P5 at the upstream end of the inner bottom portion 36G of the second flow path reducing portion 36B extends to the upstream side from the position P4 at the upstream end of the inner upper portion 36H. In addition, the vertical position P3 of the inner bottom portion 36G of the second flow path reducing portion 36B is set lower than the vertical position P1 of the bottom portion (inner bottom portion) of the interior 32C of the storage tank main body 32. With such a configuration, the cross-sectional area of the upstream side of the second flow path reducing part 36B is enlarged, and the second flow path reducing part 36B can increase the amount of liquid flowing out to the outlet OUT. More specifically, the position P4 is a position on the most downstream side of the inner wall surface 36E of the first flow path reducing portion 36A. The inner bottom portion 36G of the second flow path reducing portion 36B extends from the position P4 to the upstream position P5 by the dimension L. The position P5 is located on the upstream side of the connection site between the second flow path reducing portion 36B and the first flow path reducing portion 36A.

The channel cross section of the second channel reducing portion 36B is expanded toward the upstream side, as particularly shown in FIG. More specifically, in the second flow path reduction part 36B, the inner upper part 36H from the boundary part with the outflow pipe connection part 36J toward the upstream opening part (corresponding to the boundary part with the first flow path reduction part 36A). Is extended upward in the vertical direction. In the present embodiment, the expanded portion is configured as a curved diverting wall surface 36D that bulges upstream in the upstream opening portion of the second flow path reducing portion 36B. The shunt wall surface 36D has a center position Po at 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, and has a radius R1. The smaller dimension is the radius R2, which is substantially coincident with the curve drawn on the upstream side.

As shown in FIGS. 6 to 8, the main body connecting portion 36C is formed integrally with the peripheral edge of the first flow path reducing portion 36A on the downstream side, and coincides with the tube axis C1 of the storage tank main body 32 so as to be downstream from the upstream side. It is formed in a cylindrical tube extending toward the side. Similar to the main body connecting portion 34C of the inflow pipe connecting member 34, the main body connecting portion 36C has an inner diameter set to a dimension equal to or slightly larger than the outer diameter of the storage tank main body 32, and the other end of the storage tank main body 32. 32B is inserted and connected inside. A stepped vertical wall 36F having a diameter smaller than the inner diameter of the main body connecting portion 36C is provided at a boundary portion between the main body connecting portion 36C and the first flow path reducing portion 36A. The other end portion 32B of the storage tank main body 32 can be inserted up to the step vertical wall 36F inside the main body connection portion 36C, and the step vertical wall 36F is used for positioning to attach the outflow pipe connection member 36 to the storage tank main body 32. Yes.

As shown in FIG. 8, when the other end portion 32B of the storage tank main body 32 is assembled to the outflow pipe connecting member 36 (connected state), the vertical position P1 of the inner bottom portion of the other end portion 32B is a step. In the vertical wall 36F, the vertical position (reference number omitted) of the inner bottom portion of the second flow path reduction portion 36B is matched. That is, a step portion is not generated in the drainage flow path from the storage tank main body 32 to the flow path reducing portion 36S.

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

(Structure of the 1st storage part 40 and the 2nd storage part 50)
As shown in FIG. 2, the first storage unit 40 and the second storage unit 50 are arranged in parallel with the storage tank main body 32 in the horizontal direction. The first reservoir 40 includes a storage tank body 42 having the same configuration as the storage tank body 32, an inflow pipe connection member 44 having the same configuration as the inflow pipe connection member 34, and an outflow pipe connection member having the same configuration as the outflow pipe connection member 36. 46 as a main component. In the present 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 via the overflow pipe (communication pipe) 60. The inflow pipe connecting member 34 is connected to the overflow pipe connecting portion 34D. The second pipe 24 is connected to the outflow pipe connecting member 46.

Similarly to the first storage unit 40, the second storage unit 50 includes a storage tank body 52 having the same configuration as the storage tank body 32, an inflow pipe connection member 54 having the same configuration as the inflow pipe connection member 34, and an outflow pipe connection member. 36, an outflow pipe connecting member 56 having the same configuration as that of 36 is provided as a main configuration. An inflow pipe connection portion (reference numeral omitted) 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. It is connected to the pipe connecting part 44D. The overflow pipe 60 has three connection parts connected to the overflow

pipe connection parts

34D, 44D, and 54D on the downstream side, and connects the three connection parts (reference numerals omitted) on the upstream side. In plan view, it is formed using E-shaped piping. The second pipe 24 is connected to the outflow pipe connecting member 56. In addition, without providing the overflow pipe 60, the overflow

pipe connection portions

34D, 44D, and 54D may be directly connected.

As shown in FIG. 2, one end (reference number omitted) of the upstream side of the vent pipe 62 is connected to the overflow pipe 60. More specifically, one end of the vent pipe 62 is connected to the overflow pipe 60 at an intermediate portion between the overflow pipe connecting portion 44D and the overflow pipe connecting portion 54D. The other end portion on the downstream side of the overflow pipe 60 is connected to the second pipe 24 in the present embodiment. In addition, without providing the vent pipe 62, the storage tanks may be configured to release internal air from each other.

In addition, as shown in FIG. 2, the vertical height on the upstream side of the storage tank 30 is set slightly higher than the vertical height on the downstream side by a height H2. That is, the storage tank 30 is inclined downward in the vertical direction from the upstream side toward the downstream side. With such a configuration, it is possible to shorten the time required to raise the liquid level (water level) at the outlet OUT of the storage tank 30 and to fill up the soot pipe (the other end 24C of the second pipe 24). The time required for power activation can be reduced. Furthermore, liquid remaining in the storage tank 30 can be prevented.

Further, the storage tank 30 according to the present embodiment includes three components, that is, a storage tank body 32, an inflow pipe connection member 34, and an outflow pipe connection member 36. The inflow pipe connecting member 34 is assembled on the upstream side of the storage tank main body 32, and the outflow pipe connection member 36 is assembled on the downstream side of the storage tank main body 32 to assemble the storage tank 30. In addition, the storage tank main body 32, the inflow pipe connection member 34, and the outflow pipe connection member 36 may be integrally formed.

(Operation and effect of the present embodiment)
In the storage tank 30 according to the present embodiment, as shown in FIG. 2, the storage tank main body 32 can store wastewater that has flowed into the interior 32 C from the upstream side. A flow path reducing section 36S is provided on the downstream side of the storage tank main body 32, and an outlet OUT (see FIG. 8) through which waste water flows out of the storage tank main body 32 is provided in the flow path reducing section 36S.

Here, as shown in FIG. 8, a part of the flow path reducing portion 36S provided on the downstream side of the storage tank main body 32 swells outside the flow path reducing portion 36S (a curved shape recessed to the downstream side). ) An inner wall surface 36E is provided. As shown in FIG. 9, a portion of the drainage (liquid) F 1 on the lower side in the vertical direction of the drainage (liquid) F 1 flowing from the upstream side to the downstream side of the storage tank main body 32 passes through the flow path reducing portion 36 S of the outflow pipe connecting member 36. It flows out to the 2nd piping 24 (refer FIG.1 and FIG.2) as F2. The other part of the upper portion in the vertical direction of the drainage F1 that did not flow out from the outlet OUT (see FIG. 8) of the flow path reducing portion 36S hits the inner wall surface 36E (or the diversion wall surface 36D) of the flow path reducing portion 36S. It flows along the inner wall surface 36E as F3.

FIG. 10 (A) shows the downstream outflow state when the storage tank 30 according to the present embodiment is half full. In the figure, arrows indicate the flow of waste water in detail. As described above, the other part of the drainage F1 hits the inner wall surface 36E of the first channel reduction portion 36A of the channel reduction portion 36S and flows along the inner wall surface 36E as the drainage F3. As shown in FIG. 11 (A), when the water is almost full, the other part of the drainage F1 hits the inner wall surface 36E and flows along the inner wall surface 36E as the drainage F3. In particular, as shown in FIG. 11A, the drainage F3 in the vicinity of the outlet OUT (see FIG. 8) is spaced vertically upward from the outlet OUT along the inner wall surface 36E of the first flow path reducing portion 36A. Guided in the direction. For this reason, the flow of the wastewater F1 from the upstream side of the storage tank 30 toward the downstream outlet OUT becomes difficult to be suppressed by the wastewater F3 and the drainage F4 that did not flow out of the outlet OUT. Therefore, according to the storage tank 30 according to the present embodiment, the drainage F2 can easily flow out from the outlet OUT, and the drainage capacity of the drainage F2 can be improved.

On the other hand, in the storage tank 80 according to the second comparative example shown in FIG. 10C and FIG. 11C, the inner wall surface 86E of the first flow path reducing portion 86A of the outflow pipe connecting member 86 has the upper part upstream. The plane is inclined. The storage tank 80 is not provided with a portion corresponding to the second flow path reducing portion 36B of the present 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 according to the second comparative example, the other part of the drainage water F1 collides with the inner wall surface 86E regardless of whether it is nearly full or close to full, and is retained by turbulence and backflow. Wastewater F5. This drainage F5 inhibits a part of the drainage F1 from flowing out, so that the drainage F2 from the outflow pipe connecting portion 86J does not easily flow out, and the outflow amount of the drainage F2 is small.

Further, in the storage tank 30 according to the present embodiment, as shown in FIG. 8, the inner bottom portion 36 G of the second flow path reduction part 36 B of the flow path reduction part 36 S in the outflow pipe connecting member 36 is Lower than the inner bottom. More specifically, the inner bottom portion 36G extends from the position P4 on the most downstream side of the inner wall surface 36E to the upstream side by a distance L to the position P5, and the vertical position P3 of the inner bottom portion 36G corresponds to the inner bottom portion of the storage tank body 32. It is set lower than the vertical position P1.

As shown in FIG. 9, FIG. 10 (A) and FIG. 11 (A), the waste water F1 flowing from the upstream side to the downstream side of the storage tank main body 32 changes the flow downward in the flow path reducing portion 36S. It becomes difficult to hit the inner wall surface 36E and easily flows out as the drainage F2 to the outside of the storage tank main body 32 through the second flow path reducing portion 36B (from the outlet port OUT). For this reason, the flow of the wastewater F1 from the upstream side of the storage tank 30 toward the downstream outlet OUT becomes difficult to be suppressed by the wastewater F3 and the drainage F4 that did not flow out of the outlet OUT.

Furthermore, in the storage tank 30 according to the present embodiment, as shown in FIG. 5, an inflow port IN is provided on the upstream side (inflow pipe connecting member 34) of the storage tank body 32, and from the inflow port IN to the inside 32 C. Waste water flows in. Since the inflow port IN is provided opposite to the outflow port OUT on the downstream side (outflow pipe connecting member 36) of the storage tank main body 32, the waste water F1 flowing in from the inflow port IN is linear toward the outflow port OUT. Flowing into. Here, even if the drainage F1 flows linearly, as shown in FIG. 8, the inner wall surface 36E of the flow path reducing portion 36S is a curved surface that bulges to the downstream side. As shown in FIG. 10A and FIG. 11A, the flow of the waste water F2 is difficult to be suppressed. Furthermore, since the drainage F1 flows linearly from the inlet IN to the outlet OUT, the momentum of the drainage F1 does not decline, and the outflow amount of the drainage F2 can be increased.

Further, in the storage tank 30 according to the present embodiment, as shown in FIG. 8, the flow path reducing section 36S includes a first flow path reducing section 36A on the storage tank body 32 side and a second flow path on the outlet OUT side. And a reduction unit 36B. Here, the second flow path reducing portion 36B is formed in a tubular shape that is expanded toward the upstream side. That is, the upstream channel cross-sectional area of the second channel reducing part 36B is made larger than the downstream channel cross-sectional area. For this reason, the waste water F2 which flows into the 2nd flow path reduction part 36B increases, and the outflow amount of the waste water F2 from the outflow port OUT can be increased. Further, as shown in FIG. 9, FIG. 10 (A) and FIG. 11 (A), since the outflow amount of the waste water F3 that does not flow out from the outflow port OUT decreases, the flow of the waste water F1 from the upstream side toward the outflow port OUT. Becomes difficult to be suppressed by the drainage F3 and the drainage F4 that have not flowed out from the outlet OUT.

Here, in the storage tank 70 according to the first comparative example shown in FIGS. 10B and 11B, the outflow pipe connecting member 76 includes a first flow path reducing section 76A and an outflow pipe connecting section 76J. The flow passage cross-sectional area of the outflow pipe connecting portion 76J is constant. A portion corresponding to the second flow path reduction portion 36 B of the present embodiment is not provided in the storage tank 70. The inner wall surface 76E of the first flow path reducing portion 76A has a curved surface similar to the inner wall surface 36E of the first flow path reducing portion 36A of the present embodiment shown in FIGS. 10 (A) and 11 (A). Yes. In the storage tank 70 according to the first comparative example, a large amount of the drainage F1 flows toward the inner wall surface 76E, so that the drainage F1 hits the inner wall surface 76E regardless of whether it is half full or close to full. It tends to become the wastewater F5 in which the retention has occurred. For this reason, the flow of the wastewater F1 from the upstream side toward the outlet OUT is easily suppressed by the wastewater F5 that has not flowed out of the outlet OUT.

Furthermore, in the storage tank 30 according to the present embodiment, as shown in FIG. 8, the flow dividing wall surface 36 D is configured in the opening portion on the upstream side of the second flow path reducing portion 36 B, and the flow dividing wall surface 36 D is the storage tank main body 32. Bulges to the side (curved to protrude upstream). For this reason, the direction of the flow of the waste water F2 hitting the split wall surface 36D does not change abruptly and gradually changes toward the outlet OUT. It can be made to flow out to the outflow port OUT. As a result, the flow of the wastewater F1 from the upstream side toward the outlet is hardly suppressed by the wastewaters F3 and F4 that have not flowed out from the outlet OUT.

Here, in the storage tank 70 according to the first comparative example shown in FIGS. 10B and 11B, the flow dividing wall surface 36D of the present embodiment is not provided. In the storage tank 70 according to the first comparative example, the flow rate of the drainage F1 returning to the inflow port IN as the drainage F5 increases, so that it flows from the upstream side regardless of whether it is half full or near full. The flow of the wastewater F1 toward the outlet is easily suppressed by the wastewater F5 that has not flowed out from the outlet OUT.

Further, in the storage tank 30 according to the present embodiment, as shown in FIG. 8, the flow path cross-sectional area near the opening on the upstream side of the second flow path reducing portion 36B is increased upward in the vertical direction. The speed of the component in the vertical direction is increased by the weight of the drainage F2, and the outflow amount of the drainage F2 from the second flow path reduction unit 36B can be further increased. For this reason, the outflow amount of the waste water F2 from the second flow path reduction part 36B can be further increased, and the flow rate of the waste water F3 toward the inner wall surface 36E, which causes turbulent flow and reverse flow, can be reduced.

Furthermore, in the storage tank 30 according to the present embodiment, as shown in FIG. 2, when the storage capacity of the storage tank main body 32 is exceeded, the first storage part 40 and the second storage part 50 are made to overflow. be able to. For this reason, the storable amount of drainage can be supplemented by the first reservoir 40 and the second reservoir 50.

Moreover, the siphon drainage system 10 according to the present embodiment includes a storage tank 30, a first pipe 22, and a second pipe 24, as shown in FIG. The 1st piping 22 flows the waste_water | drain from the watering device 14 into the inside of the storage tank 30 (inside 32C of the storage tank main body 32). When the inflow amount of the waste water F1 is larger than the outflow amount of the waste water F2 from the outlet OUT of the storage tank 30, the inflow waste water F1 is stored in the storage tank 30. The stored wastewater F1 is discharged from the outlet OUT of the storage tank 30 through the second pipe 24. Here, in the storage tank 30, since the flow of the drainage F1 from the upstream side toward the outlet OUT is difficult to be suppressed by the drainage F3 and the drainage F4 that did not flow out from the outlet OUT, the outflow amount of the drainage F2 may be increased. it can. For this reason, it is possible to reduce the time required to fill up the soot pipe (from the intermediate part 24B to the other end 24C) of the second pipe 24, and it is possible to reduce the time required to activate the siphon force.

Furthermore, in the outflow pipe connecting member 36 according to the present embodiment, as shown in FIG. 8, a first flow path reducing portion 36A is provided, and the first flow path reducing portion 36A is a curved inner portion that is recessed downstream. A wall surface 36E is provided. The first flow path reducing portion 36A is provided with an outlet OUT that allows the drainage F1 to flow out of the storage tank body 32. Here, the outflow pipe connecting member 36 can be assembled on the downstream side of the storage tank main body 32. For this reason, the outflow pipe connecting member 36 is assembled to the storage tank main body 32, and the storage tank 30 in which the outflow of the waste water F2 from the outlet OUT is not hindered by turbulent flow or reverse flow can be easily manufactured.

Further, as shown in FIG. 8, the outflow pipe connecting member 36 according to the present embodiment includes a flow path reducing portion 36S, an outlet port OUT, and an inner wall surface 36E that bulges outside the flow path reducing portion 36S. With. Here, the outflow pipe connecting member 36 can be assembled on the downstream side of the storage tank main body 32. For this reason, the outflow pipe connecting member 36 is assembled to the storage tank main body 32, and the storage tank that is difficult to be suppressed by the drainage F3 and the drainage F4 in which the flow of the drainage F1 from the upstream side toward the outlet OUT is not discharged from the outlet OUT. 30 can be easily manufactured.

Furthermore, as shown in FIG. 8, the outflow pipe connecting member 36 according to the present embodiment includes a flow path reducing portion 36S and an outlet OUT, and the inner bottom portion 36G of the flow path reducing portion 36S is a storage tank body. It is made lower than the inner bottom part of 32. Here, the outflow pipe connecting member 36 can be assembled on the downstream side of the storage tank main body 32. For this reason, the outflow pipe connecting member 36 is assembled to the storage tank main body 32, and the storage tank that is difficult to be suppressed by the drainage F3 and the drainage F4 in which the flow of the drainage F1 from the upstream side toward the outlet OUT is not discharged from the outlet OUT. 30 can be easily manufactured.

Therefore, the storage tank 30, the siphon drainage system 10, and the outflow pipe connecting member 36 according to the present embodiment can easily discharge the drainage F2 from the outlet OUT, and can increase the outflow amount of the drainage F2.

[Second Embodiment]
The storage tank 30 which concerns on 2nd Embodiment of this invention is demonstrated using FIG. In the description of the present embodiment and the third embodiment to be described later, the same reference numerals are given to the components having the same functions as those of the storage tank 30 according to the first embodiment, and a duplicate description is omitted.

As shown in FIG. 12A, in the storage tank 30 according to the present embodiment, in the outflow pipe connecting member 36, the first flow path reducing portion 36A of the flow path reducing portion 36S swells downstream in plan view. It is formed in a semi-cylindrical shape. Although not shown, the inner wall surface of the first flow path reducing portion 36A has a curved shape that is recessed downstream. The second flow path reducing part 36B is integrally formed at the most downstream side of the first flow path reducing part 36A and in the lower part in the vertical direction. In addition, the storage tank main body 32 is made into the rectangular cylinder shape in this Embodiment.

As shown in FIG. 12B, in the storage tank 30 according to the first modified example, in the outflow pipe connecting member 36, the first flow path reducing portion 36A of the flow path reducing portion 36S swells downstream in a side view. It is formed in a semi-cylindrical shape. Although not shown, the inner wall surface of the first flow path reducing portion 36A has a curved shape that is recessed downstream. The second flow path reduction part 36B is integrally formed at the most downstream side of the first flow path reduction part 36A and in the vertical intermediate part.

As shown in FIG. 12C, in the storage tank 30 according to the second modification, in the outflow pipe connecting member 36, the first flow path reducing portion 36A of the flow path reducing portion 36S swells downstream in plan view. It is formed in a semi-cylindrical shape. Although not shown, the inner wall surface of the first flow path reducing portion 36A has a curved shape that is recessed downstream. The second flow path reducing portion 36B is integrally formed at a position shifted in the lateral direction from the most downstream side of the first flow path reducing portion 36A and at the lower portion in the vertical direction.

As shown in FIG. 12D, in the storage tank 30 according to the third modified example, in the outflow pipe connecting member 36, the first flow path reducing portion 36A of the flow path reducing portion 36S swells downstream in a plan view. It is formed in a semi-cylindrical shape, and the upper part of the first flow path reducing part 36A is inclined downward in the vertical direction from the storage tank body 32 to the second flow path reducing part 36B. Although illustration is omitted, the inner wall surface of the first flow path reducing portion 36A is provided with a curved portion that is recessed downstream. The second flow path reducing portion 36B is connected to the lowermost portion in the vertical direction on the most downstream side of the first flow path reduced portion 36A.

As shown in FIG. 12 (E), in the storage tank 30 according to the fourth modified example, in the outflow pipe connecting member 36, the first flow path reducing portion 36A of the flow path reducing portion 36S is moved to the downstream side in plan view. One semi-cylindrical part is formed in an M-shape that bulges. Although not shown in the drawings, the inner wall surface of the first flow path reducing portion 36A is provided with two curved portions that are recessed toward the downstream side. Although not clearly shown in FIG. 12E, a second flow path reducing portion 36B is provided between the first flow path reducing portion 36A and the outflow pipe connecting portion 36J. The second flow path reducing portion 36B is integrally formed between the semi-cylindrical portions at the lower part in the vertical direction of the first flow path reducing portion 36A.

(Operation and effect of the present embodiment)
In the storage tank 30 according to the present embodiment, the same operational effects as the operational effects obtained by the storage tank 30 according to the first embodiment described above can be obtained. Similar effects can be obtained for the siphon drainage system 10 and the outflow pipe connecting member 36.

Further, in the storage tank 30 according to the present embodiment and the first to fourth modifications, the first flow path reduction portion 36A of the outflow pipe connecting member 36 is used by using a composite surface combining a flat surface and a curved surface. An inner wall surface (36E) can be formed. For this reason, the inner wall surface 36E (see FIG. 8) from which the drainage F2 easily flows can be easily formed.

[Third Embodiment]
The storage tank 30 which concerns on 3rd Embodiment of this invention is demonstrated using FIG.

As shown in FIG. 13A, in the storage tank 30 according to the present embodiment, in the outflow pipe connecting member 36, the inner wall surface 36E of the first flow path reducing portion 36A of the flow path reducing portion 36S has a plurality of It is formed in a curved shape that is recessed toward the downstream side by using a multi-sided surface in which the plane FS is continuously changed at different angles.

As shown in FIG. 13B, in the storage tank 30 according to the fifth modification, in the outflow pipe connecting member 36, the inner wall surface 36E of the flow path reducing portion 36S has a flat surface FS and a plurality of curved surfaces CS (multiple surfaces). Is formed in a curved shape that is recessed downstream. In the fifth modification, the most downstream side of the inner wall surface 36E is a flat surface FS.

As shown in FIG. 13C, in the storage tank 30 according to the sixth modification, in the outflow pipe connecting member 36, the inner wall surface 36E of the flow path reducing portion 36S has a curved surface CS and a plurality of flat surfaces FS (multiple surfaces). Is formed in a curved shape that is recessed downstream. In the sixth modification, the most downstream side of the inner wall surface 36E is a curved surface CS.

Further, in the storage tank 30 according to the present embodiment, the fifth modified example, and the sixth modified example, as shown in FIGS. 13A to 13C, multiple surfaces (plural planes FS), planar FSs are provided. The inner wall surface 36E of the first flow path reducing portion 36A of the outflow pipe connecting member 36 can be formed using a composite surface obtained by combining the curved surface CS and the curved surface CS. For this reason, it is possible to easily form the inner wall surface 36E from which the drainage F2 easily flows out.

[Other forms]
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the above embodiment, each of the first flow path reduction part 36A, the second flow path reduction part 36B, and the outflow pipe connection part 36J of the outflow pipe connection member 36 is integrally formed. These may be formed as separate parts and assembled to each other to form the outflow pipe connecting member 36. Moreover, in the said embodiment, although the storage tank main body 32 is made into cylindrical shape or a rectangular cylinder shape, this invention is the cross-sectional shape of the storage tank main body 32, such as an elliptic cylinder shape, trapezoid cylinder shape, polygonal cylinder shape. It is not limited to. Furthermore, the present invention is not limited to the siphon drainage system 10 and can be widely applied to storage tanks that store liquid.

10 Siphon drainage system, 14 watering device, 22 1st piping, 24 2nd piping, 28 standpipe, 30 storage tank, 32 storage tank body, 32C inside, 34 inflow pipe connection member, 34B inflow pipe connection section, 34D Overflow pipe connection part, 36 Outflow pipe connection member, 36S Flow path reduction part 36A First flow path reduction part, 36B Second flow path reduction part, 36D Split wall surface, 36E Inner wall surface, 36G Inner bottom part, 36J Outflow pipe connection part 40 first reservoir, 50 second reservoir, 60 overflow pipe, 62 vent pipe, IN inlet, OUT outlet.

Claims

A storage tank body capable of storing liquid flowing into the interior from the upstream side;
A flow path reduction portion that is provided on the downstream side of the storage tank main body and has a smaller flow path cross-sectional area on the downstream side than the upstream side;
Provided on the downstream side of the flow path reducing portion, and an outlet for allowing the liquid to flow out of the storage tank body;
An inner wall surface provided on a part of the flow path reducing portion, and bulging to the outside of the flow path reducing portion;
A storage tank with
The storage tank according to claim 1, wherein the inner wall surface has a curved surface that bulges outside the flow path reduction portion.
The storage tank according to claim 1 or 2, wherein an inlet for allowing the liquid to flow into the inside of the storage tank body is provided to face the outlet.
The flow path reduction part is configured to include a first flow path reduction part on the storage tank main body side and a second flow path reduction part on the outlet side,
The storage tank according to any one of claims 1 to 3, wherein the outlet is formed by a tubular outflow pipe connecting portion extending downstream from the second flow path reducing portion.
The storage tank according to claim 4, wherein a shunt wall surface that bulges toward the storage tank main body is formed in the second flow path reduction portion.
6. The storage tank connected to the upstream side of the storage tank main body by a communication port is provided, and the liquid overflowed from the storage tank main body flows into the other storage tank. The storage tank of any one of items.
The storage tank according to any one of claims 1 to 6,
A first pipe that connects the watering device and the upstream side of the storage tank;
A second pipe connected to the outlet of the storage tank and having a soot pipe that allows the liquid to flow out to a position lower than the outlet;
Siphon drainage system equipped with.
An outflow pipe connecting member that can be assembled on the downstream side of the storage tank body in which the liquid flowing into the inside from the upstream side can be stored,
A flow path reduction portion provided on the downstream side and having a downstream cross-sectional area smaller than the upstream side; and
An outlet that is provided on the downstream side of the flow path reduction portion and allows the liquid to flow out of the flow path reduction portion;
An inner wall surface provided on a part of the flow path reducing portion, and bulging to the outside of the flow path reducing portion;
An outflow pipe connecting member.