JP6573469B2 - Backflow prevention valve and siphon drainage system - Google Patents

Description

  The present invention relates to a check valve and a siphon drainage system.

  A backflow prevention valve may be provided on the downstream side of the drainage direction of the watering device that drains so that odors from the sewage side do not flow back to the watering device side (see, for example, Patent Document 1).

The backflow prevention valve is formed of an elastic material, and includes a tubular portion for attachment to the pipe side, a throttle portion extending from the tubular portion to the downstream side in the drain direction, and an on-off valve provided at the tip portion of the throttle portion. It is preferable that the on-off valve is normally closed.
When drainage is performed from the watering device and water pressure acts on the backflow prevention valve, the on-off valve is elastically deformed and opened, and the drainage passes through the on-off valve and flows downstream.
When the drainage from the watering device ends and no water pressure is applied, the on-off valve returns to its original state and closes.

  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 2). The siphon drainage system connects the siphon drainage pipe to the watering equipment and improves the drainage efficiency from the watering equipment by using the siphon force (negative pressure) generated in the vertical pipe that forms the hanging part of the siphon drainage pipe. It is a system to let you.

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

JP 2014-015719 A JP 2000-297447 A

By the way, in the siphon drainage system, even if drainage from the watering device is finished, negative pressure is generated in the horizontal pulling pipe while the drainage in the vertical pipe is falling, and backflow is generated while negative pressure is generated. Air continues to flow from the equipment side around the water to the prevention valve.
However, with this type of backflow prevention valve, there is no problem while drainage is flowing, but the on / off valve of the backflow prevention valve vibrates while air is flowing, and generates abnormal noise (for example, a buzzing sound). There is a case.

  In view of the above facts, an object of the present invention is to provide a backflow prevention valve and a siphon drainage system that can suppress abnormal noise when air passes.

The backflow prevention valve according to claim 1 is a tubular portion, a throttle portion extending from the tubular portion, an on-off valve that is provided at the tip of the throttle portion and is in surface contact with an elastic force to close the flow path, A chamfered cutout formed on both sides in the longitudinal direction of the edge opposite to the throttle portion when the on-off valve is viewed in plan.

In the check valve according to the first aspect, the on-off valve is opened while air is passed from the upstream side to the downstream side. The on-off valve of the check valve, since the notch of the beveled on both sides in the longitudinal direction of the opposite edge is formed with aperture portion upon the opening and closing valve is viewed in plane, the chamfer-shaped notch The contact area of the on-off valve is reduced as compared with the case where it is not provided, and the bending rigidity in the thickness direction of the on-off valve is reduced. As a result, it becomes difficult for the opened on-off valve to be deformed in the closing direction by the elastic force, and the vibration level of the on-off valve in the state in which the on-off valve is opened can be reduced, and abnormal noise can be suppressed.

  According to a second aspect of the present invention, in the check valve according to the first aspect, when the on-off valve is viewed in plan, the notch portion is inclined with respect to a direction orthogonal to the axis of the tubular portion. Yes.

  In the check valve according to claim 2, when the on-off valve is viewed in plan, the notch portion is inclined with respect to the direction orthogonal to the axis of the tubular portion. The bending rigidity in the thickness direction of the valve can be reduced, the vibration level of the on-off valve when the on-off valve is opened can be reduced, and abnormal noise can be suppressed.

  According to a third aspect of the present invention, in the backflow prevention valve according to the first or second aspect, the on-off valve is formed of a material having a Young's modulus lower than that of the throttle portion.

  In the check valve according to claim 3, since the on-off valve is formed of a material having a Young's modulus lower than that of the throttle portion, the bending rigidity in the thickness direction of the on-off valve can be further reduced. The vibration level of the on-off valve in the opened state can be further reduced, and abnormal noise can be further suppressed.

  The siphon drainage system according to claim 4, wherein the drainage from the watering device is drained in a horizontal direction, and the drainage from the lateral pulling tube is dropped downwardly in communication with the horizontal pulling tube. The said on-off valve is arrange | positioned toward the downstream of a drainage direction between the siphon drainage pipe comprised including the dredging pipe which drains, the said watering device, and the said horizontal drawing pipe of Claims 1-3. The check valve according to any one of the above items is provided.

  In the siphon drainage system according to the fourth aspect, when drainage is discharged from the watering device, the drainage flows through the horizontal pulling pipe and the vertical pipe through the backflow prevention valve. When the soot pipe is filled with drainage, the drainage in the soot pipe falls due to gravity, and a suction force corresponding to the head difference in the soot pipe, that is, siphon force is generated inside the soot pipe. When the siphon force is generated, the drainage in the horizontal pulling pipe is sucked by the siphon force toward the soot pipe, so that the horizontal pulling pipe and the soot pipe are filled with drainage so-called full flow, and the inside of the horizontal pulling pipe and the soot pipe is filled. Flow down.

  In some cases, drainage from the water supply equipment ends and air flows to the backflow prevention valve. However, the backflow prevention valve is provided with a notch on the on-off valve, so it is compared to when the notch is not provided. Thus, the bending rigidity in the thickness direction of the on-off valve can be reduced. For this reason, it becomes difficult for the opened on-off valve to be deformed in the closing direction by the elastic force, the vibration level of the on-off valve in the opened state can be reduced, and abnormal noise can be suppressed in the siphon drainage system.

  According to a fifth aspect of the present invention, in the siphon drainage system according to the fourth aspect, drainage from the plurality of watering devices flows into the horizontal pulling pipe.

  In the siphon drainage system according to claim 5, drainage from a plurality of watering devices flows into the horizontal pulling tube, and when drainage is performed from any of the watering devices, Positive pressure may act on However, since a backflow prevention valve is provided between the horizontal pipe and the watering device, it prevents the positive pressure from acting on the watering device from the horizontal pipe side, and the drainage goes to the watering device side. Backflow can be suppressed.

  As described above, since the backflow prevention valve and the siphon drainage system of the present invention have the above-described configuration, it has an excellent effect that it can mainly suppress abnormal noise when air passes.

It is the perspective view seen from the downstream which shows the backflow prevention valve which concerns on a reference example . It is a side view of the backflow prevention valve shown in FIG. (A) is sectional drawing (3 (A) -3 (A) sectional view taken on the line of FIG. 2) along the axis of the backflow prevention valve, (B) is the backflow with the on-off valve closed from the downstream side. It is a front view which shows a prevention valve, (C) is a front view which shows the backflow prevention valve by which the on-off valve was open | released seeing from the downstream. It is sectional drawing which shows the building where the siphon drainage system which concerns on a reference example was applied. (A) is a side view which shows a part of siphon drainage system which drains from a kitchen sink, (B) is a side view which shows a part of siphon drainage system from which drainage from a kitchen sink was complete | finished. . It is a side view which shows the siphon drainage system which concerns on a 2nd reference example . It is a side view which shows the backflow prevention valve which concerns on embodiment . It is a side view which shows the backflow prevention valve which concerns on other embodiment . It is a side view which shows the other modification of a backflow prevention valve. It is a side view which shows the other modification of the backflow prevention valve which concerns on embodiment . It is a side view which shows the other modification of a backflow prevention valve.

[ First Reference Example ]
A siphon drainage system 10 according to a reference example will be described with reference to FIGS.

  As shown in FIG. 4, the floor panel 14 is arrange | positioned at intervals on the slab 12 of a dwelling unit, On the floor panel 14, the kitchen sink 16 as a watering implement, and a dishwasher 18 is arranged. The kitchen sink 16 is provided with a disposer 20, a drain trap 22, and a joint 24 with a check valve on the downstream side in the direction of drainage. The siphon drainage is connected to the downstream side of the joint 24 with a check valve via a pipe 26. A horizontal pulling tube 28A of the tube 28 is connected. The horizontal pipe 28 </ b> A is disposed on the slab 12, and the dredging pipe 28 </ b> B of the siphon drain pipe 28 is suspended through a vertical hole 30 formed in the slab 12 and connected to the drainage stack 32. .

As shown in FIG. 5A, the drain trap 22 is, for example, substantially S-shaped, and has a structure in which sealed water is stored. A vent valve 36 is attached to the drain trap 22 of this reference example . When the downstream side of the drain trap 22 has a negative pressure, the vent valve 36 takes outside air into the trap downstream side so that the drain trap 22 does not break.

(Backflow prevention valve)
The joint 24 with the backflow prevention valve includes a substantially cylindrical backflow prevention valve 38 made of an elastic material such as rubber.
As shown in FIGS. 1 and 3, the backflow prevention valve 38 includes an annular tubular portion 44 as an engaging portion that engages with a flange portion 42 provided in the main body portion 40 of the joint 24 with the backflow prevention valve. On the downstream side of the tubular portion 44, a substantially cylindrical throttle portion 48 having a pair of flat portions 46 that are closer to each other as they are separated from the tubular portion 44 is integrally formed. Since the backflow prevention valve 38 is formed of an elastic material, the diameter of the tubular portion 44 can be easily increased and the flange portion 42 is detachable. The tubular portion 44 and the throttle portion 48 are arranged coaxially, and the center line (axis line) CL of the tubular portion 44 and the center line (axis line) CL of the throttle portion 48 coincide. The center line CL here coincides with the central axis of the fluid flowing through the backflow prevention valve 38.

  As shown in FIG. 2, the flat surface portion 46 faces the downstream side (opposite the tubular portion 44) of the throttle portion 48, and is viewed from a direction orthogonal to the tubular portion 44 and the center line CL of the throttle portion 48. When viewed from the side, a substantially rectangular on-off valve 50 having a longitudinal direction perpendicular to the center line CL is integrally formed. As shown in FIG. 3A, the on-off valve 50 is formed with a constant thickness. The throttle portion 48 is a portion where the passage cross-sectional area orthogonal to the center line CL is gradually throttled from the main body portion 40 toward the on-off valve 50, that is, a small portion (see FIG. 3A). .

  As shown in FIG. 3B, when the backflow prevention valve 38 is viewed from the downstream side in the axial direction, the opening / closing valve 50 has a notch 52 penetrating in the axial direction along the longitudinal direction in the central portion in the thickness direction. Is formed. This notch 52 does not reach both ends in the longitudinal direction of the on-off valve 50. That is, the notch 52 does not completely traverse the on-off valve 50 in the longitudinal direction, and the flat plate portion 54 on one side and the flat plate portion 54 on the other side sandwich the notch 52 and are axial in both longitudinal ends. They are connected to each other throughout. As long as no pressure is applied from the upstream side (throttle portion 48 side), the on-off valve 50 has a flat plate portion 54 on one side of the cut 52 and a flat plate portion 54 on the other side, as shown in FIG. When the pressure is applied from the upstream side, the flat plate portion 54 on one side and the flat plate on the other side, as shown in FIG. Each of the portions 54 is elastically deformed into a substantially arc shape to be in an open state as a valve (opened in an elongated elliptical shape).

As shown in FIG. 2, the opening / closing valve 50 has a straight portion 56 </ b> Aa extending in a direction orthogonal to the center line CL in a plan view at the end 50 </ b> A on the axial front end side (downstream in the drainage direction as the backflow prevention valve 38). And a substantially trapezoidal cutout portion 56 </ b> A configured to include an inclined portion 56 </ b> Ab extending inclinedly with respect to a direction orthogonal to the center line CL. 2 indicates the original rectangular outline (contour) of the on-off valve 50 when the notch 56A is not formed. In this reference example , “notch” means that a part of the original shape (as an example , a rectangle in this reference example ) is cut into a concave shape in order to reduce the bending rigidity of the on-off valve 50 in the thickness direction. To do. The cutout portion 56 </ b> A may be processed after the on-off valve 50 is molded into a rectangle, or may be formed together with the on-off valve 50.
Thus, by forming the notch 56A in the on-off valve 50, the bending rigidity in the thickness direction can be reduced as compared with the case where the notch 56A is not formed.

(Function, effect)
Next, the operation of the check valve 38 of this reference example will be described.
When drainage is performed from the kitchen sink 16 by using the kitchen sink 16, the drainage reaches the joint 24 with the backflow prevention valve via the disposer 20 and the drain trap 22. When drainage flows into the backflow prevention valve 38, the on / off valve 50 is expanded by the pressure of the drainage, passes through the on / off valve 50 that has been opened, and is discharged downstream (see FIG. 5A).

  After that, the drainage from the kitchen sink 16 flows through the horizontal pulling pipe 28A and the soot pipe 28B of the siphon drainage pipe 28, and when a part of the soot pipe 28B is filled with the drainage so-called full flow, the drainage in the soot pipe 28B is It falls due to gravity, and a siphon force corresponding to the water head difference in the soot tube 28B is generated inside the soot tube 28B.

  The drainage in the horizontal pulling pipe 28A is sucked toward the dredging pipe 28B by siphon force, and becomes a full flow in which the horizontal pulling pipe 28A and the dredging pipe 28B are filled with drainage. The waste water from the kitchen sink 16 is discharged to the drainage stack 32.

  Even if drainage from the kitchen sink 16 ends, siphoning force is generated in the state where the drainage pipe 28B is filled with drainage, and the horizontal pulling pipe 28A has negative pressure. Air flows from the vent valve 36 of the drain trap 22 into the pipe 28A. That is, the pressure on the upstream side of the backflow prevention valve 38 is relatively larger than the pressure on the downstream side, so that the on-off valve 50 is expanded by the air pressure on the upstream side of the backflow prevention valve 38 and air passes through the on-off valve 50. (See FIG. 5B).

By the way, when the air passes through the on-off valve 50, the on-off valve 50 made of an elastic material tends to vibrate. However, the on-off valve 50 of this reference example has a notch 56A, and the notch 56A is formed. Since the bending rigidity in the thickness direction is reduced as compared with the case where it is not, the vibration level of the on-off valve 50 is suppressed, and abnormal noise generated by the vibration is also suppressed.

  When all the drainage in the dredge 28B is discharged to the drainage stack 32, the inside of the siphon drainage pipe 28 is ventilated with the internal space of the drainage stack 32, and the upstream side and the downstream side of the backflow prevention valve 38 Is eliminated, and the on-off valve 50 is closed. Thereby, the backflow prevention valve 38 can prevent the backflow, such as an odor from a downstream side, and the loss of the sealing water in a drain trap.

  When the dishwasher 18 is drained, the inside of the horizontal pulling pipe 28A may temporarily become positive pressure, but the backflow prevention valve 38 maintains the open / close valve 50 in a closed state. It is possible to suppress the drainage or air in the pulling pipe 28 </ b> A from flowing backward to the upstream side of the on-off valve 50. For this reason, even if drainage is made from the dishwasher 18, the drain trap 22 does not break.

[ Second Reference Example ]
Next, the siphon drainage system 10 which concerns on a 2nd reference example is demonstrated using FIG. In addition, the same code | symbol is attached | subjected to the same structure as a 1st reference example, and the description is abbreviate | omitted.
As shown in FIG. 6, in the siphon drainage system 10 of this reference example , the drain trap 22 used in the siphon drainage system 10 of the first reference example is omitted.

In this reference example , when drainage is finished from the kitchen sink 16 and siphoning force is generated in the vertical pipe 28B, the horizontal pulling pipe 28A has a negative pressure. Although air flows in from the drainage part of the sink 16 and the air passes through the on-off valve 50, the occurrence of abnormal noise in the on-off valve 50 is suppressed as in the first reference example .

[ Embodiments and other reference examples ]
Although the reference example has been described above, the reference example is not limited to the above, and it is needless to say that various modifications can be made without departing from the gist of the reference example .

7 and 8 show a backflow prevention valve 38 according to the embodiment of the present invention, and FIGS. 9 to 11 show modified examples of the backflow prevention valve 38 according to the reference example . 7 to 11, the same components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

The backflow prevention valve 38 according to the embodiment shown in FIG. 7 is formed by forming chamfered notches 56C at corners at both ends in the longitudinal direction on the downstream side of the on-off valve 50, and has a rectangular shape indicated by a two-dot chain line. Although the contact area between one flat plate portion 54 and the other flat plate portion 54 is reduced, the backflow prevention function is not lowered, and the thickness direction of the on-off valve 50 is more than the rectangular shape indicated by the two-dot chain line. The bending rigidity of the is reduced.

The backflow prevention valve 38 according to another embodiment shown in FIG. 8 is formed with notches 56D that are larger than the notches 56C of the on-off valve 50 in FIG. Thus, the bending rigidity in the thickness direction of the on-off valve 50 is further reduced as compared with the backflow prevention valve 38 of FIG.

The backflow prevention valve 38 according to the reference example shown in FIG. 9 is formed by forming a triangular notch 56E at the center of the downstream edge 50A of the on-off valve 50, rather than the rectangular shape indicated by the two-dot chain line. The contact area between one flat plate portion 54 and the other flat plate portion 54 is reduced, and the bending rigidity in the thickness direction of the on-off valve 50 is lower than the rectangular shape indicated by the two-dot chain line.

The backflow prevention valve 38 according to another embodiment shown in FIG. 10 has a plurality of triangular cutout portions 56F formed at the downstream edge 50A of the on-off valve 50, and is a rectangle indicated by a two-dot chain line. The contact area between one flat plate portion 54 and the other flat plate portion 54 is smaller than the shape, and the bending rigidity in the thickness direction of the on-off valve 50 is lower than the rectangular shape indicated by the two-dot chain line. is there.

Although the above-described reference example and the backflow prevention valve 38 of the embodiment are entirely formed of a single elastic material, the backflow prevention valve 38 shown in FIG. The material is made of a material having a Young's modulus lower than that of the material constituting the narrowed portion 48. Accordingly, the backflow prevention valve 38 shown in FIG. 11 can further reduce the bending rigidity of the on-off valve 50 in the thickness direction, the vibration level of the on-off valve 50 can be further suppressed, and abnormal noise generated by the vibration can be further reduced. It can be suppressed.
Note that the material of the on-off valve 50 and the material of the throttle 48 may be different in the backflow prevention valve 38.
The backflow prevention valve 38 in FIGS. 7 to 11 has a reduced bending rigidity in the thickness direction of the on-off valve 50, so that vibration of the on-off valve 50 is suppressed, and abnormal noise generated by the vibration is also suppressed.
In the present invention, the inclination means an angle (except 90 °) with respect to the direction orthogonal to the center line CL, and the shape of the inclined portion is as follows. It may be a straight line or a curved line such as an arc.

In the above embodiment, the backflow prevention valve 38 is disposed on the downstream side of the kitchen sink 16, but the backflow prevention valve is not limited to being disposed on the downstream side of the kitchen sink 16, for example, a wash basin, a washing machine, a unit bath, etc. It may be arranged on the downstream side of other watering devices that drain water such as baths and toilets.
In the above embodiment, the backflow prevention valve 38 is arranged in the vertical direction in the pipe that flows the drainage in the vertical direction. However, the backflow prevention valve 38 is not limited to be arranged in the vertical direction, but in the pipe that flows the drainage in the lateral direction. It may be arranged.
Moreover, in the said embodiment, although the dredging pipe 28B of the siphon drain pipe 28 was connected to the drainage stack 32, the siphon drainage system 10 does not connect the dredging pipe 28B to the drainage stack 32, for example, 2 of a detached house. It can also be applied to the floor. The dredger pipe 28B may be connected to a drainage pipe or a pipe for gradient drainage.

  DESCRIPTION OF SYMBOLS 10 ... Siphon drainage system, 16 ... Kitchen sink (watering device), 28 ... Siphon drainage pipe, 28A ... Horizontal drawing pipe, 28B ... Saddle pipe, 38 ... Backflow prevention valve, 44 ... Tubular part, 48 ... Throttling part, 50 ... Opening / closing valve, 56A to 56F ... Notch

Claims (5)

A tubular section;
A throttle portion extending from the tubular portion;
An on-off valve that is provided at the distal end of the throttle portion and is in surface contact with the elastic force to close the flow path;
A chamfered cutout formed on both sides in the longitudinal direction of the edge opposite to the throttle portion when the on-off valve is viewed in plan,
A backflow prevention valve comprising. The backflow prevention valve according to claim 1, wherein the cutout portion is inclined with respect to a direction orthogonal to the axis of the tubular portion when the on-off valve is viewed in plan. The back-flow prevention valve according to claim 1 or 2, wherein the on-off valve is formed of a material having a Young's modulus lower than that of the throttle portion. A siphon comprising a horizontal pipe that drains the drainage from a watering device in a horizontal direction, and a vertical pipe that is connected to the horizontal pipe and drops the drainage from the horizontal pipe by dropping downward. Drainage pipes,
The backflow prevention valve according to any one of claims 1 to 3, wherein the on-off valve is disposed between the watering device and the horizontal pipe toward the downstream side in the direction of drainage.
Siphon drainage system equipped with. The siphon drainage system according to claim 4, wherein drainage from the plurality of watering devices flows into the horizontal pipe.