JP7458295B2 - Piping structure - Google Patents

Description

The present invention relates to piping structures.

A siphon drainage structure in which a kitchen sink and a dishwasher are connected is disclosed (see Patent Document 1).

Japanese Patent Application Publication No. 2016-196744

However, in the case of dishwashers with high drain pressure, there is a concern that a lot of drainage will backflow into other plumbing equipment, which could cause the seal of the drain trap corresponding to that plumbing equipment to break.

The present invention aims to reduce the force of drainage from a dishwasher.

The piping structure according to the first aspect includes a first drainage system for discharging wastewater from plumbing equipment, and a first drainage system for discharging wastewater from a dishwasher installed separately from the plumbing equipment. It has a second drainage system that merges with the second drainage system, and a meandering section that is provided in a straight section of the second drainage system and is formed by meandering pipe lines.

In this piping structure, a meandering section formed by a meandering pipe line is provided in the straight section of the second drainage system through which wastewater from the dishwasher flows, so that while the wastewater passes through the meandering section, The flow is disturbed and pressure loss occurs. Therefore, even if the dishwasher has a high drainage pressure, the force of drainage from the dishwasher can be reduced.

Further, the second drainage system joins the first drainage system through which drainage water from a plumbing device other than the dishwasher flows. As described above, since the force of the drainage water is reduced at the meandering portion of the second drainage system, the backflow of the drainage water to the first drainage system side (plumbing equipment side) is reduced. Therefore, breaking of the water seal in the drain trap corresponding to the plumbing equipment is suppressed.

In a second aspect, in the piping structure according to the first aspect, the meandering portion includes a concave portion having a concave shape toward the center of the conduit, and a concave portion having a convex shape toward the center of the conduit. A convex portion is formed, and the maximum thickness of the tube wall at the convex portion is larger than the maximum thickness of the tube wall at the concave portion.

In this piping structure, a convex portion and a concave portion are formed in the meandering portion. The wastewater flowing through the meandering portion hits the convex portion relatively strongly as it flows. Drainage from a dishwasher may contain foreign substances such as abrasives and broken dishes, but the maximum thickness of the pipe wall at the convex part is greater than the maximum thickness of the pipe wall at the concave part. Since it is also large, the durability of the piping against abrasives and foreign substances is high. Furthermore, since the wastewater flows in a swirling manner in the recess, dirt is easily sent out from the recess. Therefore, it is difficult for foreign matter to adhere to the meandering portion.

A third aspect is the piping structure according to the second aspect, in which the convex portions and the concave portions are alternately formed in the longitudinal direction of the meandering portion, and the convex portions and the concave portions are formed alternately in the radial direction of the meandering portion. The recesses are facing each other.

In this piping structure, convex and concave portions are alternately formed in the longitudinal direction of the serpentine section, so the force of the wastewater can be efficiently reduced. In addition, the convex and concave portions face each other in the radial direction of the serpentine section, so there is less change in the cross-sectional area of the pipe compared to when convex portions and concave portions face each other in the radial direction. This allows the wastewater to flow efficiently while efficiently reducing the force of the wastewater.

In a fourth aspect, in the piping structure according to the second aspect or the third aspect, in the radial cross section of the meandering portion, the contour of the convex portion on the inner surface of the conduit is an arc shape, and The contour of the recess on the inner surface of the channel is elliptical in shape.

In this piping structure, the recess has an elliptical outline. Here, it is assumed that the recess has an arc shape having the same center as the ellipse and the same radius as the minor axis radius of the ellipse. Then, the amount of depression of the concave portion from the center of the ellipse (circle) will be larger in the elliptical shape than in the circular arc shape. For this reason, the waste water flowing through the meandering portion can easily enter deeply into the recess, and a large pressure loss can be caused by the waste water.

In addition, because the wastewater tends to swirl in the recess, foreign matter is less likely to adhere to the serpentine section.

In a fifth aspect, in the piping structure according to any one of the first to fourth aspects, the first drainage system and the second drainage system are connected to a siphon drainage pipe.

In this piping structure, the first drainage system and the second drainage system are connected to a siphon drainage pipe. The siphon drain pipe has a smaller diameter than the slope drain pipe in order to generate siphon force, but since the second drainage system has a meandering part, the drainage from the dishwasher is similar to the first drainage. Backflow to the system side (water equipment side) is reduced.

A sixth aspect is the piping structure according to any one of the first to fifth aspects, wherein in the second drainage system, each of the plurality of meandering portions looks like a straight pipe when viewed from the front. , and among the vertically adjacent meandering parts provided at different height positions, the downstream end of the meandering part located on the upper side and the upstream end of the meandering part located on the lower side are connected by a U-shaped part. has been done.

In this piping structure, a plurality of meandering sections are provided at different height positions and are connected in series by the U-shaped section, so while the length of each meandering section is suppressed, the pipe length of the entire meandering section can be reduced. can be made longer. Thereby, the force of drainage from the dishwasher can be efficiently suppressed.

According to the present invention, the force of drainage from the dishwasher can be reduced.

1 is a front view showing an outline of a siphon drainage system having a piping structure according to an embodiment of the present invention. It is a perspective view showing a meandering part. FIG. 3 is a cross-sectional view showing a state in which the meandering portion is cut along a horizontal plane.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated based on drawing. Components shown using the same reference numerals in the drawings refer to the same or similar components. Note that redundant descriptions and symbols in the embodiments described below may be omitted. Moreover, "upstream" means the upstream side in the drainage direction, and "upstream end" means the end on the upstream side in the drainage direction. "Downstream" means the downstream side in the drainage direction, and "downstream end" means the downstream end in the drainage direction.

In FIG. 1, a piping structure 10 according to the present embodiment is used, for example, in a siphon drainage system 12. The piping structure 10 has a first drainage system 1, a second drainage system 2, and a meandering section 14.

As shown in FIG. 1, floor panels 22 are arranged at intervals on the floor slab 20 of the dwelling unit, and on the floor panels 22 are installed a kitchen sink 16 as an example of plumbing equipment, and a dishwasher 18 are arranged.

The first drainage system 1 is a piping structure that drains wastewater from a kitchen sink 16, and corresponds to the section from the kitchen sink 16 to a siphon drain pipe 32, which will be described later. For example, a garbage disposer 24 is attached to the drain outlet 16A of the kitchen sink 16. Connected downstream of the garbage disposer 24 are a piping 26, a water-sealed drain trap 28, and a piping 30.

A siphon drain pipe 32 is arranged downstream of the pipe 30. The siphon drain pipe 32 includes a horizontal pipe 32A and a vertical pipe 32B. The inner diameter of the siphon drain pipe 32 is, for example, the same inner diameter as the pipe 30. The horizontal drawing pipe 32A is arranged on the floor slab 20. The vertical pipe 32B of the siphon drain pipe 32 is suspended through a vertical hole 34 formed in the floor slab 20, and is connected to a drainage vertical pipe (not shown) extending in the vertical direction of the dwelling unit.

As an example, a pressure relief device 36 and a vent valve 38 are provided upstream of the water seal in the drain trap 28 . The pressure relief device 36 is configured such that when waste water is momentarily discharged from the dishwasher 18 and the positive pressure inside the piping 30 increases instantaneously, the inside of the piping 30 becomes positive pressure, and the air inside the piping 30 is released into the drain trap 28. Although the inside tries to flow backwards, the pressure relief device 36 buffers the positive pressure, thereby preventing the water seal from breaking (in this case, the seal breaking due to the backflow of air).

The vent valve 38 takes in outside air when the downstream side becomes negative pressure, and suppresses the seal breaking of the drain trap 28, specifically, the phenomenon in which the accumulated sealed water is sucked downstream due to the negative pressure and disappears. can do. Further, the vent valve 38 is closed during normal times to prevent the leakage of bad odors and the like. As the vent valve 38, a known one (for example, one described in Japanese Patent Application Laid-open No. 2009-299866) can be used. Note that "negative pressure" means that the pressure is lower than the outside air in the environment in which the piping structure 10 is placed.

The second drainage system 2 is a pipe that drains water from a dishwasher 18 installed separately from the kitchen sink 16 and joins the first drainage system 1, and is connected to a siphon drainage pipe (described later) from the dishwasher 18. 32. The second drainage system 2 joins the first drainage system 1 at the horizontal draw pipe 32A. In this way, the second drainage system 2 may not directly join the first drainage system 1, but may join at a position downstream from the first drainage system 1.

A pipe 40 extending downward is connected to the drain section of the dishwasher 18. An elbow pipe 44 is connected to the downstream end of the pipe 40 via a pipe joint 42 . A plurality of meandering portions 14, for example three meandering portions 14, are provided in series on the downstream side of the elbow pipe 44. The meandering portions 14 are provided in the straight portions of the second drainage system 2, and are each formed by meandering pipe lines 14A.

As shown in FIG. 1, the plurality of meandering portions 14 are provided at different height positions so that they each look like a straight tube when viewed from the front. Specifically, the three meandering portions 14 are each configured to have the same length, and are spaced apart from each other in the vertical direction so that the longitudinal direction is the horizontal direction. Further, among the vertically adjacent meandering parts 14, the downstream end of the upper meandering part 14 and the upstream end of the lower meandering part 14 are connected by a U-shaped part 46. As a result, the three meandering portions 14 are arranged in series while meandering within the vertical plane as a whole.

The most downstream meandering section 14 is connected to a pipe 50 via a pipe joint 48 . The pipe 50 extends downward via a rising portion 52 that extends, for example, to near the lower end of the drain trap 28, and is connected to the horizontal pipe 32A.

As shown in Figure 2, the external appearance of the serpentine section 14 is configured so that, for example, when viewed from the front in the direction of the arrow A, it appears to be a straight pipe, but when viewed from the top in the direction of the arrow B, it appears to have a serpentine shape. As shown in Figure 3, the serpentine section 14 is formed with a recess 14B that is concave toward the center of the pipeline 14A, and a protrusion 14C that is convex toward the center of the pipeline 14A. The center of the pipeline 14A is the center of the cross section at each position in the longitudinal direction, and corresponds roughly to line L in Figure 3.

The convex portions 14C and the concave portions 14B may be alternately formed in, for example, about 12 sets in the longitudinal direction of the meandering portion 14. Further, in the radial direction of the meandering portion 14, the convex portion 14C and the concave portion 14B may face each other. Furthermore, the maximum value t1 of the thickness of the tube wall in the convex portion 14C may be larger than the maximum value t2 of the thickness of the tube wall in the concave portion 14B. Further, in the radial cross section of the meandering portion 14, the contour of the convex portion 14C on the inner surface of the conduit 14A may be arcuate, and the contour of the recessed portion 14B on the inner surface of the conduit 14A may be oval. The radial cross section is the cross section at the position where the pipe line 14A meanders the most, that is, the amplitude of the meandering is the largest. In this embodiment, as shown in FIG. It is.

(effect)
The present embodiment is configured as described above, and its operation will be described below. In FIG. 1, in a piping structure 10 according to the present embodiment, a meandering section 14 formed by meandering a pipe line 14A is provided in a straight portion of a second drainage system 2 through which wastewater from a dishwasher 18 flows. It is being While the waste water passes through the meandering section 14, the flow is disturbed and a pressure loss occurs. The waste water flows in a meandering manner like line L. Therefore, even if the dishwasher 18 has a high drainage pressure, the force of drainage from the dishwasher 18 can be reduced.

Further, the second drainage system 2 joins the first drainage system 1 through which drainage from a kitchen sink 16 separate from the dishwasher 18 flows. As described above, the force of the drainage water is reduced at the meandering portion 14 of the second drainage system 2, so that the backflow of the drainage water to the first drainage system 1 side (kitchen sink 16 side) is reduced. Therefore, breaking of the water seal in the drain trap 28 corresponding to the kitchen sink 16 is also suppressed.

As shown in FIG. 3, when the meandering portion 14 has a convex portion 14C and a concave portion 14B, the waste water flowing through the meandering portion 14 flows while relatively strongly hitting the convex portion 14C. Drainage from the dishwasher 18 may contain foreign substances such as abrasives and broken dishes, but the maximum thickness t1 of the tube wall in the convex portion 14C is equal to the thickness of the tube wall in the concave portion 14B. Since this value is larger than the maximum value t2, the durability of the pipe against abrasives and foreign substances is high. Further, since the waste water flows while swirling around the vortex 54 in the recess 14B, dirt is easily sent out from the recess 14B. Therefore, it is difficult for foreign matter to adhere to the meandering portion 14.

Further, when the convex portions 14C and the concave portions 14B are alternately formed in the longitudinal direction of the meandering portion 14, the force of drainage can be efficiently reduced. When the protrusions 14C and the recesses 14B face each other in the radial direction of the meandering part 14, the duct 14A is cut more easily than when the protrusions 14C and the recesses 14B face each other in the radial direction. There is little change in area. Furthermore, the three meandering portions 14 are arranged in series, meandering within the vertical plane as a whole. For this reason, it is possible to efficiently flow the waste water while effectively reducing the force of the waste water.

The contour of the recess 14B may be elliptical. Here, as shown by line C in FIG. 3, it is assumed that the recess 14B has an arc shape having the same center as the ellipse and the same radius as the minor axis radius of the ellipse. Then, the amount of depression of the recess 14B from the center of the ellipse (circle) is larger in the elliptical shape than in the arc shape (line C). For this reason, the waste water flowing through the meandering portion 14 can easily enter deeply into the recess 14B, and a large pressure loss can be caused by the waste water.

In addition, the waste water tends to swirl around in the concave portion 14B, and foreign matter is easily washed away. Therefore, it becomes even more difficult for foreign matter to adhere to the meandering portion 14.

As shown in FIG. 1, in this embodiment, as an example, a first drainage system 1 and a second drainage system 2 are connected to a siphon drainage pipe 32. The siphon drain pipe 32 has a smaller diameter than a sloped drain pipe (not shown) in order to generate siphon force, but since the second drain system 2 has a meandering part 14, it can be easily used in a dishwasher. This reduces the possibility that the waste water from 18 flows back to the first drainage system 1 side (kitchen sink 16 side).

In addition, in FIG. 1, a plurality of meandering parts 14 are provided at different height positions and are connected in series by the U-shaped part 46, so that while the length of each meandering part 14 is suppressed, the entire meandering part The length of the pipe can be increased. Thereby, the force of drainage from the dishwasher 18 can be efficiently suppressed.

Furthermore, since the plurality of meandering portions 14 are arranged so as to each look like a straight tube when viewed from the front, the appearance of the meandering portions 14 that are vertically adjacent to each other is more The distance between them can be reduced. Thereby, the installation space for the meandering portion 14 can be reduced.

In this way, according to this embodiment, the force of drainage from the dishwasher 18 can be reduced.

[Other embodiments]
Although an example of the embodiment of the present invention has been described above, the embodiment of the present invention is not limited to the above, and can be implemented with various modifications other than the above without departing from the spirit thereof. Of course there is.

In the above embodiment, the piping structure 10 is used for the siphon drainage system 12, but the piping structure 10 can also be used for a normal drainage system having slope piping.

The external appearance of the serpentine section 14 is shown in FIG. 2 as being straight when viewed from the front in the direction of arrow A, and as being serpentine when viewed from the top in the direction of arrow B. However, this is not limited to this, and the section may be configured as a cylinder that appears straight when viewed from all radial directions.

1 First drainage system, 2 Second drainage system, 10 Piping structure, 12 Siphon drainage system, 14 Meandering section, 14A Pipeline, 14B Concave section, 14C Convex section, 16 Kitchen sink (plumbing equipment), 18 Dish washing Machine, 32 Siphon drain pipe, 46 U-shaped part, t1 Maximum thickness of the pipe wall at the convex part, t2 Maximum value of the thickness of the pipe wall at the concave part

Claims (6)

a first drainage system for discharging wastewater from plumbing equipment;
a second drainage system that drains wastewater from a dishwasher installed separately from the plumbing equipment and joins the first drainage system;
a meandering part provided in a straight part of the second drainage system and formed by a meandering pipe line;
has
The meandering portion is formed with a concave portion having a concave shape toward the center of the conduit, and a convex portion having a convex shape toward the center of the conduit,
A piping structure in which the maximum thickness of the tube wall in the convex portion is larger than the maximum thickness of the tube wall in the concave portion . The protrusions and the recesses are alternately formed in the longitudinal direction of the meandering portion,
The piping structure according to claim 1 , wherein the protrusion and the recess face each other in a radial direction of the meandering portion. In the radial cross section of the meandering portion,
The contour of the convex portion on the inner surface of the conduit is arcuate,
The piping structure according to claim 1 or 2 , wherein the outline of the recess on the inner surface of the pipe is elliptical. The piping structure according to any one of claims 1 to 3 , wherein the first drainage system and the second drainage system are connected to a siphon drainage pipe. In the second drainage system, the plurality of meandering portions are provided so that they each look like a straight pipe when viewed from the front, and at different height positions,
Of the vertically adjacent meandering parts, the downstream end of the meandering part located on the upper side and the upstream end of the meandering part located on the lower side are connected by a U-shaped part . The piping structure described in any one of the items. a first drainage system for draining drainage from a water-related device;
a second drainage system that drains wastewater from a dishwasher installed separately from the plumbing equipment and joins the first drainage system;
a meandering section provided in a linear portion of the second drainage system and formed by meandering a pipeline;
has
In the second drainage system, the plurality of meandering portions are provided at different height positions so as to appear as straight pipes when viewed from the front,
A piping structure in which, of the vertically adjacent meandering parts, a downstream end of the meandering part located on the upper side and an upstream end of the meandering part located on the lower side are connected by a U-shaped part.