JP2017031670A - Siphon drainage system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a siphon drainage system capable of exerting a siphon force even if flow rate is low.SOLUTION: A siphon drainage system 10 comprises: a horizontal pipe part 54, which flows drainage water from a water circulation tool 16 and horizontally extends; a contracting pipe part 32A, which has a flow channel cross sectional area that contracts toward downstream side and is disposed at downstream side end of the horizontal pipe part 54; a horizontal pipe section 26A, which is connected to the downstream side end of the contracting pipe part 32A, has smaller diameter than that of the horizontal pipe part 54 and horizontally extends; a dropped pipe part 26B, which is connected to the downstream side end of the horizontal pipe section 26A and changes its direction from horizontal direction downward in vertical direction; and a vertical pipe section 26C, which is connected to the downstream side end of the dropped pipe part 26A and extends downward in vertical direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a siphon drainage system.

  In recent years, a so-called siphon drainage system has been proposed as an alternative to the conventional gradient drainage system (see, for example, Patent Document 1). As described in Patent Document 1, the siphon drainage system uses a siphon force (negative pressure) generated in a vertical pipe part that forms a hanging part of the siphon drainage pipe by connecting a siphon drainage pipe to a watering device. This is a system that improves the efficiency of drainage from watering equipment.

  In this siphon drainage system, the drainage discharged from the watering device flows into the siphon drainage pipe and fills the horizontal pulling pipe part forming the horizontal part of the siphon drainage pipe and the dredging pipe part forming the hanging part of the siphon drainage pipe. When the dredge part of the siphon drain pipe is filled with drainage, the drainage in the dredge pipe falls due to gravity, and a suction force corresponding to the water head difference in the dredge pipe part, that is, siphon force, is generated inside the dredge pipe part. The drainage in the horizontal pulling pipe part is sucked toward the soot pipe part by the siphon force, and flows into the siphon drainage pipe as a so-called full flow in which the inside of the siphon drainage pipe is filled with drainage.

  In this way, in the siphon drainage system, the drainage flows into the dredging pipe part arranged downstream of the horizontal pulling pipe part, and the siphon force is not generated unless the dredging pipe part is filled with drainage. There is a time lag between the occurrence of the siphon force and the generation of siphon force, and it is desired to drain the water quickly from the watering device.

  Here, a siphon drainage system is known in which the diameter of the horizontal pulling pipe portion is made larger than the diameter of the soot pipe portion, thereby increasing the drainage transport capacity to the soot pipe portion and facilitating the siphon action. (See Patent Document 1).

JP 2008-082153 A

  The above siphon drainage system can efficiently drain a large amount of drainage from a bathtub or washing machine, but in the case of a small amount of drainage such as a shower or wash surface, especially when a water-saving faucet is used, It is difficult for the inside of the soot tube section to become full and siphon force is less likely to occur.

  In consideration of the above-described facts, an object of the present invention is to provide a siphon drainage system that can generate siphon force even with a small flow rate.

  The siphon drainage system according to claim 1 allows drainage from a watering device to flow, and is connected to a horizontal pipe portion extending in a horizontal direction and a downstream end portion of the horizontal pipe portion, and a bottom surface of an inner peripheral wall. Is horizontal following the bottom surface of the horizontal pipe, and the ceiling surface of the inner peripheral wall gradually decreases in height from the horizontal pipe to the downstream, and is orthogonal to the axial direction of the horizontal pipe The cross-sectional area of the flow path in the direction to be connected is connected to a reduction pipe part that reduces toward the downstream side, and a downstream end part of the reduction pipe part, and extends in a horizontal direction that has a smaller diameter than the horizontal pulling pipe part. A horizontal pipe part, connected to the downstream end part of the horizontal pipe part, connected to the drop pipe part that changes the direction from the horizontal direction to the lower vertical direction, and connected to the downstream end part of the drop pipe part, And a soot tube portion extending downward in the direction.

  In the siphon drainage system according to claim 1, the bottom surface of the inner peripheral wall is made to be horizontal following the bottom surface portion of the horizontal pulling pipe part on the downstream side of the horizontal pulling pipe part, and the height of the ceiling surface of the inner peripheral wall is laterally drawn. There is provided a reduction pipe part that gradually decreases from the pipe part side toward the downstream side, and the flow passage cross-sectional area in the direction orthogonal to the axial direction of the horizontal pulling pipe part decreases toward the downstream side. Since the ceiling surface of the downstream flow path is positioned below the upstream flow path, the flow path downstream of the reduction pipe section can be filled with drainage from the horizontal pulling pipe section. It is possible to prevent the air inside the pulling pipe part from flowing into the downstream side of the reducing pipe part.

  In this way, the flow path on the downstream side of the reduction pipe part can be filled with drainage, so even in the horizontal pipe part arranged downstream of the reduction pipe part and having a smaller diameter than the horizontal pulling pipe part The full-flow state can be maintained, and the drainage that has maintained the full-flow state can be further led to the dredged pipe portion via the downstream drop-down pipe portion. Thereby, even if it is the case of the small amount drainage which does not become a full flow with drainage, a siphon force can be generated and drainage can be performed efficiently.

  According to a second aspect of the present invention, in the siphon drainage system according to the first aspect, when the ceiling surface is viewed in a longitudinal section along the axis of the contraction pipe portion, the ceiling surface has an axially intermediate portion. Is provided with a linear first inclined portion that is inclined at a constant angle with respect to the horizontal direction from the horizontal pulling tube portion side toward the downstream side, and downstream from the first inclined portion on the downstream side of the first inclined portion. A first arc portion that is convex toward the inner peripheral side of the tube is provided so that the angle with respect to the horizontal direction gradually decreases toward the side.

  In the siphon drainage system according to claim 2, when the ceiling surface is viewed in a longitudinal section along the axis of the reduction pipe portion, the ceiling surface has a horizontal direction from the horizontal pipe portion to the downstream side. A linear first inclined portion that is inclined at a certain angle is provided, and protrudes toward the inner peripheral side of the pipe so that the angle with respect to the horizontal direction gradually decreases from the first inclined portion toward the downstream side of the first inclined portion. Since the first circular arc portion is provided, the direction of drainage flowing along the ceiling surface from the first inclined portion toward the horizontal pipe can be changed smoothly, and the water flow resistance (pressure loss) can be reduced. Since it can reduce, it can be made to flow to the side of a dredging pipe without destroying the water mass which became the full flow state formed in the horizontal pipe part, and a dredging pipe can be made into a full flow.

  According to a third aspect of the present invention, in the siphon drainage system according to the first or second aspect, the side wall surface on one side in the width direction and the other side in the width direction on the inner peripheral wall of the contraction pipe portion across the axis. The distance between the side wall surface and the side wall surface gradually decreases from the side of the horizontal pulling tube portion toward the downstream side.

  In the siphon drainage system according to the third aspect, in the case of a small amount of drainage in which the horizontal pulling pipe portion is not filled with drainage by gradually decreasing the interval between the side wall surfaces toward the downstream side, The water level can be gradually raised to raise the water level in the horizontal pipe part, and the inside of the horizontal pipe part can be easily filled.

  According to a fourth aspect of the present invention, in the siphon drainage system according to the third aspect, when the side wall surface is viewed in a horizontal section along the axis of the contraction pipe portion, the side wall surface has an axial intermediate portion. Is provided with a linear second inclined portion that is inclined at a constant angle with respect to the axis line from the lateral pulling tube side toward the downstream side, and downstream from the second inclined portion on the downstream side of the second inclined portion. A second arc portion that is convex toward the inner peripheral side of the tube is provided so that the angle with respect to the axis gradually decreases toward the side.

  In the siphon drainage system according to claim 4, since the linear second inclined portion is provided and the second arc portion is provided on the downstream side of the second inclined portion, the drainage flowing along the side wall surface is discharged. The direction can be changed smoothly.

  As described above, the siphon drainage system of the present invention has an excellent effect that siphon force can be generated even with a small flow rate.

It is a side view showing the whole siphon drainage system composition of this embodiment. It is a longitudinal cross-sectional view along the axis which shows the coupling vicinity of a siphon drain pipe. It is a longitudinal cross-sectional view along the axis line of the 2nd connection member which shows the ceiling surface of a taper hole. It is a horizontal sectional view along the axis which shows the joint vicinity of a siphon drain pipe. It is a horizontal sectional view in alignment with the axis of the 2nd connecting member which shows the side wall surface of a taper hole. (A) is a longitudinal cross-sectional view along the axis which shows the principal part of the siphon drainage system which concerns on Example 1, (B) is a longitudinal cross section along the axis which shows the principal part of the siphon drainage system which concerns on the comparative example 1. FIG. FIG. (A) is a longitudinal cross-sectional view along the axis which shows the principal part of the siphon drainage system which concerns on the comparative example 2, (B) is a longitudinal cross section along the axis which shows the principal part of the siphon drainage system which concerns on the comparative example 3. FIG.

  An embodiment of a siphon drainage system according to the present invention will be described with reference to FIGS. FIG. 1 is a schematic diagram showing the overall configuration of a siphon drainage system 10 according to the present embodiment. The siphon drainage system 10 according to the present embodiment is a drainage system that efficiently drains drainage from a watering device using siphon force.

  The siphon drainage system 10 is used in an apartment house composed of a plurality of floors, and includes a drainage standpipe 12 through which drainage flows downward as shown in FIG. The drainage stack 12 extends in the vertical direction (longitudinal direction) of the apartment house, and penetrates the floor slab 14 on each floor of the apartment house. In addition, although the siphon drainage system which concerns on this invention is used suitably for collective housing, it can be used also for detached houses, factories, etc. other than collective housing.

  A watering device 16 is provided in each door of each floor of the apartment house, and a drainage trap 17 is connected to the watering device 16 on the downstream side in the draining direction. One end of a first piping member 24 that constitutes a part of the siphon drain pipe 22 is connected to the end of the drain trap 17 on the downstream side in the drain direction. The siphon drain pipe 22 includes a first piping member 24, a second piping member 26, and a diameter conversion joint 28 that connects the first piping member 24 and the second piping member 26. In the present embodiment, the first piping member 24, the second piping member 26, and the diameter conversion joint 28 are formed of synthetic resin.

  The first piping member 24 constituting the siphon drain pipe 22 is disposed substantially horizontally on the floor slab 14, and a part of the upstream side extends upward in the vertical direction and is connected to the drain trap 17. ing.

  In the present embodiment, the inner diameter of the first piping member 24 is 28.1 mm, and the inner diameter of the second piping member 26 is 20 mm. A synthetic resin pipe having a nominal diameter of 25 J is used for the first piping member 24, and a synthetic resin pipe having a nominal diameter of 20 A is used for the second piping member 26.

  As shown in FIG. 2, the diameter conversion joint 28 includes a tubular first connection member 30 and a tubular second connection member 32, and is disposed horizontally. A first insertion hole 34 into which the first piping member 24 is inserted is formed in the first connection member 30 on the upstream side. An annular groove 36 is formed on the inner peripheral surface of the first insertion hole 34, and a seal member 38 made of an annular elastic body is fitted in the annular groove 36. By inserting the first piping member 24 into the first insertion hole 34, the seal member 38 is brought into close contact with the outer peripheral surface of the first piping member 24, and the space between the first piping member 24 and the first connection member 30 is sealed. To do.

  The first connection member 30 has a second insertion hole 42 into which the large-diameter portion 40 of the second connection member 32 is inserted on the downstream side.

  On the inner peripheral surface of the first connecting member 30, an annular stopper having a smaller diameter than the first insertion hole 34 and the second insertion hole 42 between the first insertion hole 34 and the second insertion hole 42. 44 is formed. The end of the first piping member 24 and the end of the second piping member 26 are abutted against the stopper 44.

  The second connecting member 32 has a large-diameter portion 40 inserted into the second insertion hole 42 of the first connecting member 30 on the upstream side, and a small-diameter portion 46 formed on the downstream side. The large-diameter portion 40 is a portion having a large diameter with a portion on the upstream side of the second connection member 32 being thick, and is inserted into the second insertion hole 42 of the first connection member 30 and fixed. The large diameter portion 40 and the second insertion hole 42 can be fixed with an adhesive or the like.

Inside the second connecting member 32, a flow channel 48 whose flow channel cross-sectional area gradually decreases from the upstream side to the downstream side is formed on the upstream side, and an insertion hole 50 having a constant diameter is formed on the downstream side. Yes.
The inner diameter of the insertion hole 50 is slightly larger than the inner diameter of the downstream end portion of the flow path 48. The channel 48 of the present embodiment has a circular cross section at a right angle in the axial direction, and is formed so that the diameter gradually decreases from the upstream side toward the downstream side. The insertion hole 50 has a circular cross section perpendicular to the axial direction.

  Here, the inner diameter of the first piping member 24, the inner diameter of the stopper 44 of the first connecting member 30, and the inner diameter of the upstream side of the flow path 48 of the second connecting member 32 are the same inner diameter. For this reason, the inner peripheral surface of the first piping member 24, the inner peripheral surface of the stopper 44, and the inner peripheral surface on the upstream side of the flow path 48 are smoothly connected without a step.

  The second piping member 26 is inserted and connected to the insertion hole 50 of the second connection member 32. Since the inner diameter of the second piping member 26 is the same as the inner diameter of the downstream end of the flow channel 48, the inner peripheral surface of the second piping member 26 and the inner peripheral surface of the downstream side of the flow channel 48 are used. Is connected smoothly without steps.

Further, as shown in a longitudinal sectional view along the axis of FIG. 2, the lower end of the inner peripheral surface of the first piping member 24, the lower end of the inner peripheral surface of the stopper 44 of the first connecting member 30, and the second connecting member 32 The lower end of the inner peripheral surface of the channel 48, that is, the bottom surface, and the lower end of the inner peripheral surface of the portion inserted into the insertion hole 50 of the second connection member 32 of the second piping member 26 are stepped in a straight line in the horizontal direction. There is no connection.
In the present embodiment, the horizontal direction is not limited to the direction of 90 ° with respect to the vertical direction, but includes substantially horizontal. Practically horizontal means a range of 90 ° ± 5 ° with respect to the vertical direction. 90 ° + 5 ° means that the downstream side in the direction of drainage is inclined so as to be higher than the upstream side, and 90 ° -5 ° means that the downstream side is inclined so as to be lower than the upstream side. Means that

  As shown in FIGS. 2 and 3, the ceiling surface 48U on the inner peripheral surface of the flow channel 48 is on the side of the horizontal pipe portion (right side in FIGS. 2 and 3), that is, from the upstream side to the downstream side (left side in FIGS. 2 and 3). ), A linear first inclined portion 48A inclined at a constant angle with respect to the horizontal direction is provided, and an angle with respect to the horizontal direction from the first inclined portion 48A toward the downstream side on the downstream side of the first inclined portion 48A. A first arc portion 48B having a radius of curvature R1 that is convex toward the inner peripheral side of the tube is provided so as to gradually decrease. The tangential direction of the first arc part 48B at the downstream end of the first arc part 48B coincides with the upper end of the inner peripheral wall of the horizontal pipe part 26A, that is, the ceiling surface, and the first arc part 48B and the horizontal pipe The portion 26A is smoothly connected to the ceiling surface. The first inclined portion 48A and the first arc portion 48B are smoothly connected. In the flow channel 48, an arc portion that protrudes outward from the tube is provided on the upstream side of the first inclined portion 48A so that the angle with respect to the axial direction gradually decreases from the first inclined portion 48A toward the upstream side. May be.

Note that the center of curvature 48Bc of the first arc portion 48B is on the radially outer extension line L1 of the upstream end portion of the insertion hole 50 of the second connecting member 32.

  Therefore, the upper end of the inner peripheral surface of the flow channel 48, that is, the ceiling surface 48 U is inclined at a constant angle from the upstream side to the downstream side, and then the inclination angle gradually decreases. The vertical distance from the lower end (bottom surface) of the inner peripheral surface of the flow path 48 to the upper end of the inner peripheral surface, that is, the ceiling surface 48U, is the upstream end of the second connecting member 32. It gradually decreases from the portion to the downstream insertion hole 50.

  As shown in the horizontal sectional view along the axis of FIG. 4, the flow path 48 of the second connecting member 32 has a side wall surface 48 </ b> L on one side in the width direction and the other in the width direction across the axis from the upstream side toward the downstream side. The interval in the width direction gradually decreases from the upstream side to the downstream side so that the side wall surface 48R on the side approaches each other.

  As shown in the horizontal sectional view along the axis of FIG. 5, the side wall surface 48 </ b> R on the inner peripheral surface of the flow path 48 has a horizontal pipe portion side (right side in FIG. 5), that is, upstream from upstream to downstream ( A linear second inclined portion 48RA that is inclined at a fixed angle with respect to the axis toward the left side of FIG. 5 is provided, and an axial direction is provided downstream from the second inclined portion 48RA toward the downstream side of the second inclined portion 48RA. A second arc portion 48RB having a radius of curvature R2 which is convex toward the inner peripheral side of the tube is provided so that the angle with respect to is gradually reduced. The second inclined portion 48RA and the second arc portion 48RB are smoothly connected. The center of curvature 48RBc of the second arc portion 48RB is on the extension line L2 on the radially outer side of the upstream end portion of the insertion hole 50 of the second connecting member 32. Therefore, after the side wall surface 48R is inclined at a constant angle from the upstream side toward the downstream side, the inclination angle gradually decreases. Further, the tangential direction of the second arc portion 48RB at the downstream end of the second arc portion 48RB coincides with the side wall surface of the inner peripheral wall of the horizontal tube portion 26A, and the second arc portion 48RB and the horizontal tube portion. The side wall surface of 26A is smoothly connected. In the flow path 48, an arc portion that protrudes outward from the tube is provided on the upstream side of the second inclined portion 48RA so that the angle with respect to the axial direction gradually decreases from the second inclined portion 48RA toward the upstream side. May be.

  Although illustration is omitted, the side wall surface 48L on the inner peripheral surface of the flow path 48 is symmetrical to the side wall surface 48R across the axis, and the side wall surface 48L is also inclined at a certain angle from the upstream side to the downstream side. The inclination angle gradually decreases.

  In the present embodiment, since the inner diameter of the first piping member 24 is 28.1 mm and the inner diameter of the second piping member 26 is 20 mm, the flow path 48 has an inner diameter of 28.1 mm at the upstream end. The inner diameter of the downstream end is 20 mm, and the inner diameter is gradually reduced from 28.1 mm to 20 mm.

As shown in FIG. 2, in the siphon drain pipe 22 of the present embodiment, a portion of the first piping member 24 that is horizontally arranged in a straight line and a portion in which the stopper 44 is formed are the horizontal pulling pipe portion 54 and the portion. Has been.
A portion of the second connection member 32 where the flow path 48 is formed is a reduction tube portion 32A.
A portion of the second piping member 26 that extends linearly in the upstream horizontal direction is a horizontal pipe portion 26A.
Of the second piping member 26, a portion formed in an arc shape whose direction is changed from the horizontal direction to the lower side in the vertical direction is a dropping pipe portion 26B.
Further, in the second piping member 26, a portion that is located on the downstream side of the dropping pipe portion 26B and extends in the vertical direction is a soot pipe portion 26C.

Note that the inner diameter of the horizontal pipe portion 54 is preferably in the range of 20 mm to 40 mm. The inner diameter of each of the horizontal pipe portion 26A, the dropping pipe portion 26B, and the soot pipe portion 26C is the horizontal draw pipe portion 54. It is preferable that the inner diameter is within a range of 15 mm to 32 mm. Moreover, it is preferable that the length of the horizontal pipe portion 26A is in the range of 15 mm or more and 150 mm or less. The ratio D2 / D1 between the inner diameter D1 of the horizontal pulling pipe portion 54 and the inner diameter D2 of the horizontal pipe portion 26A is preferably in the range of 0.4 to 0.95.
In the present embodiment, the inner diameter of the horizontal pulling tube portion 54 is set to 28.1 mm, and the inner diameter of each of the horizontal tube portion 26A, the drop tube portion 26B, and the soot tube portion 26C is set to 20 mm.

  Note that the lower end of the second piping member 26 of the siphon drain pipe 22 is connected to a junction joint 56 attached to an intermediate portion of the drainage stack 12. The drainage discharged from the siphon drainage pipe 22 is discharged into the drainage stack 12 through the junction joint 56.

(Function, effect)
According to the siphon drainage system 10 of the present embodiment, the drainage discharged from the watering device 16 is drainage trap 17, first piping member 24, diameter conversion joint 28, second piping member 26, and junction joint 56, The drainage trap 17, the horizontal pulling pipe part 54, the reduction pipe part 32 </ b> A, the horizontal pipe part 26 </ b> A, the dropping pipe part 26 </ b> B, the dredging pipe part 26 </ b> C, and the junction joint 56 join to the drainage stack 12.

  Here, when a large amount of drainage flows from the watering device 16 into the siphon drainage pipe 22, the horizontal pulling pipe portion 54 becomes full of drainage, and thereafter, the drainage is maintained in a full flow state while the reduction pipe portion is maintained. 32A, the horizontal pipe part 26A, the dropping pipe part 26B, and the soot pipe part 26C flow in this order. When the drained water that has flowed down falls in the tub tube portion 26C due to gravity, a siphon force is generated by the potential energy of the siphon head Hs. Drainage inside the horizontal pulling pipe part 54, the reduction pipe part 32A, the horizontal pipe part 26A, and the dropping pipe part 26B is sucked toward the dredging pipe part 26C by siphon force, and the drainage flows down as a full flow. In addition, drainage is performed efficiently.

  On the other hand, when the amount of drainage discharged from the watering device 16 is small and the flow rate per unit time of the drainage flowing into the horizontal pulling pipe portion 54 is small, the drainage flows below the horizontal pulling pipe portion 54 and moves upward. Since a space in which air remains is formed, the horizontal pulling tube portion 54 may not be full. Here, in the siphon drainage system 10, the siphon force is not generated and the drainage inside the horizontal pulling pipe portion 54 cannot be sucked unless the inside of the downstream side pipe section 26 </ b> C becomes full.

  In the siphon drainage system 10 of the present embodiment, the reduction pipe part 32A whose flow path cross-sectional area is reduced toward the downstream side is provided on the downstream side of the horizontal pulling pipe part 54. Even when the amount of drainage is small, the flow path tends to be full on the downstream side of the reduction pipe portion 32A.

  In this way, by filling the flow path with drainage downstream of the reduced pipe portion 32A, a full flow state can be maintained even in the horizontal pipe portion 26A downstream of the reduced pipe portion 32A, and the full flow state is maintained. The drained wastewater can be further led to the dredged pipe part 26C through the dropping pipe part 26B on the downstream side. For this reason, the siphon drainage system 10 of the present embodiment can generate siphon force at the side pipe portion 26C even when the horizontal draw pipe portion 54 is a small amount of drainage that does not become full due to drainage, and the efficiency. Thus, drainage can be performed.

  In the siphon drainage system 10 of the present embodiment, the inner diameter of the horizontal pulling pipe portion 54 is in the range of 20 mm to 40 mm, the inner diameter of the horizontal pipe portion 26A is made smaller than the inner diameter of the horizontal pulling pipe portion 54, and the horizontal pipe portion 26A. Is within the range of 15 mm or more and 32 mm or less, and the length of the horizontal pipe portion 26A is within the range of 15 mm or more and 150 mm or less, it is easy to generate siphon force even when the flow rate of drainage is small.

  The ratio B / A between the inner diameter A of the horizontal pulling pipe portion 54 and the inner diameter B of the horizontal pipe portion 26A is preferably in the range of 0.4 to 0.95, as described above. When / A exceeds 0.95, the inner diameter of the horizontal pipe portion 26A does not become smaller than the inner diameter of the horizontal pulling pipe portion 54, and it is difficult to make the horizontal pipe portion 26A full when the amount of drainage is small. Become. On the other hand, when the ratio B / A is less than 0.4, the inner diameter of the horizontal pipe portion 26A becomes too small with respect to the inner diameter of the horizontal pulling pipe portion 54, and the processing flow rate becomes small.

[Test example]
In order to confirm the effect of the present invention, the siphon drainage system of the embodiment to which the present invention is applied and the siphon drainage system according to the comparative example are prototyped, and the time until the siphon force is activated after draining from the watering device. Measured by variously changing the amount of drainage.

  The principal part of the siphon drainage system which concerns on an Example and Comparative Examples 1-3 is shown by FIG.6 and FIG.7. In the siphon drainage system according to the example and the comparative examples 1 to 3, the same components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted. In Examples and Comparative Examples 1 to 3, the length L1 of the horizontal pulling pipe portion 54 is 8 m, the vertical dimension L2 of the dropping pipe portion 26B is 73 mm, and the length L3 of the dredge pipe portion 26C is 2.5 m. It was.

  Example: Siphon drainage system shown in FIG. The inner diameter of the horizontal pipe portion 54 is 28.1 mm, the inner diameter from the horizontal tube portion 26A to the soot tube portion 26C is 20 mm, and the horizontal distance A from the upstream end of the diameter conversion joint 28 to the center of the soot tube portion 26C. Was 180 mm, and the length B of the horizontal tube portion 26A was 47 mm.

  Comparative Example 1: A siphon drainage system shown in FIG. The inner diameter of the horizontal pipe 54 is 28.1 mm, the inner diameter of the soot pipe 26C is 20 mm, the horizontal distance A from the upstream end of the diameter conversion joint 28 to the center of the soot 26C is 133 mm, the horizontal pipe The length B of 26A was 0 mm.

  Comparative Example 2: Siphon drainage system shown in FIG. The inner diameter of the horizontal pipe 54 is 28.1 mm, the inner diameter of the soot pipe part 26C is 20 mm, the horizontal distance A from the upstream end of the diameter conversion joint 28 to the center of the soot pipe part 26C is 114 mm, and the horizontal pipe part The length B of 26A was 0 mm. Further, the diameter of the drop tube portion 26B is gradually reduced from the upstream end portion of the drop tube portion 26B toward the downstream end portion, and the horizontal pull tube portion is formed at the upstream end portion of the drop tube portion 26B. The same diameter as 54 and the same inner diameter as that of the soot tube portion 26C at the downstream end of the dropping tube portion 26B.

  Comparative Example 3: Siphon drainage system shown in FIG. The inner diameter of the horizontal pipe 54 is 28.1 mm, the inner diameter of the soot pipe part 26C is 20 mm, the horizontal distance A from the upstream end of the diameter conversion joint 28 to the center of the soot pipe part 26C is 118 mm, and the horizontal pipe part The length B of 26A was 0 mm. Further, the diameter was made constant from the downstream side of the horizontal pulling pipe part 54 toward the dredging pipe part 26C, and the diameter was reduced so as to have the same inner diameter as that of the dripping pipe part 26C in the vicinity of the downstream end of the dropping pipe part 26B.

In the test, the amount of drainage (liters / minute) from the watering device was changed in various ways, and the siphon activation time until the siphon force was activated was measured. Note that siphon activation means that negative pressure is generated in the horizontal pipe, and siphon activation time is the time from when the watering device starts draining until negative pressure is generated in the horizontal pipe. is there.

As a result of the test, the siphon drainage system of the example was able to generate siphon force even in a situation where the drainage amount of drainage from the watering device was as small as 5.5 L / min.
In Comparative Example 1, since there is a reduced pipe portion 32A but no horizontal pipe portion 26A, when the drainage amount is 6.5 L / min, the downstream side of the reduced pipe portion 32A is full as shown in FIG. 6B. In addition, since the succeeding tub tube portion 26C does not become full, no siphon force is generated. When there is no horizontal pipe part 26A, even if the drainage is temporarily full in the reduction pipe part 32, the drainage immediately drops and flows into the pipe part 26B. The air is separated from the air and no suction force is generated.
In Comparative Example 2, as shown in FIG. 7 (A), there is no reduction pipe part 32A and horizontal pipe part 26A upstream of the drop pipe part 26B, and the inner diameter is large, so the amount of drainage is 9 L / min. However, the tub tube portion 26C was not full and no siphon force was generated.
In Comparative Example 3, when the amount of drainage is 7 L / min, as shown in FIG. 7B, the dropping pipe part 26B does not become full, and the drainage in the horizontal pulling pipe part 54 cannot be sucked. It was.

[Other Embodiments]
Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and other various modifications can be made without departing from the spirit of the present invention. It is.
The diameter conversion joint 28 of the above embodiment is configured by connecting the first connection member 30 and the second connection member 32, but the first connection member 30 and the second connection member 32 are integrated. Also good.

  In the above embodiment, the horizontal pipe part 26A, the drop pipe part 26B, and the soot pipe part 26C are continuously constituted by one second pipe member 26. However, the horizontal pipe part 26A and the drop pipe part 26B are provided. And the pipe part 26C may be constituted by separate piping members and connected.

  In the above embodiment, the reduction tube portion 32A and the horizontal tube portion 26A are separate bodies, but the horizontal tube portion 26A may be integrally formed with the reduction tube portion 32A.

  In the above embodiment, the horizontal pipe part 26A, the drop pipe part 26B, and the soot pipe part 26C are configured by one second pipe member 26, but the horizontal pipe part 26A, the drop pipe part 26B, and the soot pipe The pipe portion 26 </ b> C may be configured by separate piping members.

  In the channel 48 of the above embodiment, the lateral width is narrowed from the upstream side toward the downstream side, but at least the height of the ceiling surface gradually decreases from the side of the horizontal pulling tube portion 54 toward the downstream side, and the channel is cut off. The area may be reduced toward the downstream side, and the lateral width may be constant from the upstream side toward the downstream side.

  In the above embodiment, the cross-sectional shapes perpendicular to the axes of the first piping member 24, the second piping member 26, and the diameter conversion joint 28 are circular. Also good.

DESCRIPTION OF SYMBOLS 10 ... Siphon drainage system, 26A ... Horizontal pipe part, 26B ... Drop pipe part, 26C ... Saddle pipe part, 32A ... Reduction pipe part, 48A ... 1st inclination part, 48B ... 1st circular arc part, 48R ... Side wall surface , 48L ... side wall surface, 48RA ... second inclined portion, 48RB ... second arc portion, 48U ... ceiling surface, 54 ... horizontal pulling tube portion,

Claims (4)

Drainage from the watering device, the horizontal pipe that extends horizontally,
Connected to the downstream end of the horizontal pipe section, the bottom surface of the inner peripheral wall is horizontal following the bottom section of the horizontal pipe section, and the ceiling surface of the inner peripheral wall is downstream from the horizontal pipe section side. A reduced pipe portion whose height is gradually reduced toward and the flow path cross-sectional area in a direction perpendicular to the axial direction of the laterally drawn pipe portion is reduced toward the downstream side;
A horizontal pipe part connected to the downstream end of the reduced pipe part and extending in the horizontal direction having a smaller diameter than the laterally drawn pipe part;
A dropping pipe connected to the downstream end of the horizontal pipe and changing direction from the horizontal to the vertical downside;
A soot pipe part connected to the downstream end of the drop pipe part and extending downward in the vertical direction;
Siphon drainage system equipped with.   When the ceiling surface is viewed in a vertical cross section along the axis of the reduction tube portion, the ceiling surface has a certain angle with respect to the horizontal direction from the horizontal tube portion side to the downstream side in the axial direction intermediate portion. A linear first inclined portion is provided, which is inclined toward the inner peripheral side of the pipe so that the angle with respect to the horizontal direction gradually decreases from the first inclined portion toward the downstream side of the first inclined portion. The siphon drainage system according to claim 1, wherein a first arc portion is provided.   An interval between the side wall surface on one side in the width direction and the side wall surface on the other side in the width direction in the inner peripheral wall of the reduction pipe portion with the axis line interposed therebetween gradually decreases from the side of the horizontal pulling pipe portion toward the downstream side. The siphon drainage system according to claim 1 or claim 2. When the side wall surface is viewed in a horizontal cross section along the axis of the contraction tube portion, the side wall surface has a certain angle with respect to the axis from the side of the horizontal tube portion toward the downstream side in the axial direction intermediate portion. And a linear second inclined portion that is inclined at the side of the tube and protrudes toward the inner peripheral side of the pipe so that the angle with respect to the axis gradually decreases from the second inclined portion toward the downstream side of the second inclined portion. The siphon drainage system according to claim 3, wherein a second arc portion is provided.

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