JP7019297B2 - Drainage pipe structure - Google Patents

Description

The present invention relates to a drainage pipe structure for draining drainage from a toilet bowl.

Flush toilets include products with various drainage methods and flush water volumes.

For example, around the 1970s, toilet bowls with a stool wash water volume of 12 to 16 L were sold, and the amount of wash water decreased with the times. From around 2000, toilet bowls with a wash water volume of 6 to 8 L (hereinafter referred to as conventional toilet bowls) ) Is now on sale.

At present, water-saving toilets with a wash water volume of 5 L or less are becoming widespread.

In addition, so-called tankless water-saving toilets that do not have a low tank for storing washing water are also gaining popularity due to their ease of cleaning and compactness, and are expected to become widespread in the future.

In any of the toilet bowls, the filth excreted in the toilet bowl of the toilet bowl is transported together with the toilet paper by the washing water so as to be pushed out to the drain pipe on the downstream side and discharged.

Further, depending on the difference in the drainage method of the toilet bowl and the amount of washing water, the transport performance of filth and the like in the drainage pipe may be different.

In the era when toilet bowls with a wash water volume of 12 L or more were the mainstream, even if there was a difference in transport performance between toilet bowls, the amount of wash water was large and there was almost no clogging of filth in the drain pipe. With the decrease in the amount of washing water, there is a growing concern about clogging of filth and the like.

Therefore, in 2001, the General Incorporated Foundation Better Living stipulated the "Excellent Housing Parts Performance Test Method Manual (Toilet Bowl)". In addition, in this excellent housing parts performance test method manual (toilet bowl), "toilet bowl transport performance test" is stipulated as an evaluation standard for transport performance of filth, etc., and toilet bowls that meet the criteria (former BL standard) based on this transport performance test are , It is recognized as a toilet bowl that meets the transport performance above a certain level.

This old BL standard was revised in 2011 and changed to a new standard (new BL standard) that reduces the load on the transport media.

At present, reports of clogging of transported materials are increasing, and among them, clogging often occurs in water-saving toilet bowls having a drainage pipe structure based on the new BL standard.

In actual use, the amount of filth, toilet paper, and other items to be transported varies depending on the toilet user, so it is impossible to completely prevent clogging of the items to be transported. How to determine the standard of the toilet is a very difficult problem.

However, when comparing the occurrence of clogging between the old BL standard and the new BL standard, it is clear that a configuration satisfying the old BL standard having a larger load is preferable.

At present, water-saving toilets are often used in new houses, but the drainage pipe structure itself is the conventional one.

In addition, even when remodeling, the toilet bowl is replaced with a water-saving toilet bowl from the conventional toilet bowl, but the drainage pipe structure under the floor is rarely changed.

Here, for example, in a drainage pipe structure connected to a water-saving toilet or the like, the configurations of Patent Document 1 to Patent Document 3 are known as those having improved transport performance.

The drainage pipe structure of Patent Document 1 has a structure for ensuring the water depth even at low water level by, for example, making the shape of the drainage pipe oval in order to improve the transport performance at low water level when the water level is low, and drainage. By providing unevenness on the bottom of the pipe, it is configured to prevent the adhesion of transported objects such as filth.

The drainage pipe structure of Patent Document 2 is configured to suppress turbulence generated in drainage by providing a protrusion (protrusion) having a rectifying surface in the vertical pipe portion directly under the toilet bowl.

The drainage pipe structure of Patent Document 3 is provided with a recess (recess) or a bulge on the inner peripheral surface of the vertical pipe portion directly under the toilet bowl, so that the conveyed material and drainage passing through the center of the vertical pipe portion can be treated. The drainage flowing along the inner peripheral surface of the vertical pipe portion flows along the concave portion or the bulging portion, and the drainage flow time is extended so that the drainage does not pass together.

Jitsukaihei No. 1-152187 Gazette Japanese Unexamined Patent Publication No. 2014-88754 Japanese Unexamined Patent Publication No. 2014-145211

However, in the configuration of Patent Document 1 described above, when the same amount of washing water is flowed, the water depth becomes deeper than that in a normal circular drainage pipe, but in a water-saving toilet bowl in which the amount of washing water is reduced to 5 L or less, the drainage pipe It is not possible to secure sufficient water depth just by making the shape oval, and there is a possibility that sufficient transport performance will not be achieved.

Further, in the configuration of Patent Document 2, there is a possibility that a large turbulent flow may occur in the flowing wastewater due to a conveyed object such as filth directly hitting the protrusion, or there is a possibility that the filth is accumulated so as to be caught by the protrusion and clogging occurs. Conceivable.

Further, in the configuration of Patent Document 3, since the drainage flow time is only extended, the transport performance is not fundamentally improved, and it is considered that sufficient transport performance cannot be obtained with a water-saving toilet or the like.

Therefore, even when applied to, for example, a water-saving toilet, a drainage pipe structure having good transport performance has been required so as to satisfy the old BL standard.

The present invention has been made in view of such a point, and an object of the present invention is to provide a drainage pipe structure capable of improving transport performance.

The drainage pipe structure according to claim 1 is a drainage pipe structure for discharging drainage, and includes a substantially V-shaped rectifying portion in a cross-sectional view located in the middle of the pipeline of the drainage pipe structure, and the rectifying portion . Is provided in the curved pipe portion .

The drainage pipe structure according to claim 2 is a drainage pipe structure for discharging drainage from a toilet bowl, and has a vertical pipe portion connected to the toilet bowl and a first bent portion connected to the downstream side of the vertical pipe portion. And a second bent portion connected to the downstream side of the first bent portion, and at least the curved pipe portion which is a part of the pipeline from the vertical pipe portion to the second bent portion is viewed in cross section. A substantially V-shaped rectifying unit is provided.

The drainage pipe structure according to claim 3 is a drainage pipe structure for draining drainage from a toilet bowl, and is a vertical pipe portion connected to the toilet bowl and a vertical pipe portion connected to the downstream side of the vertical pipe portion. A first bent portion that bends from the downstream end of the portion, and a second bent portion that is connected to the downstream side of the first bent portion and bends substantially horizontally from the downstream end of the first bent portion. The first bent portion has a substantially V-shaped rectifying portion on the inner peripheral surface of the curved tube portion in a cross-sectional view.

The drainage pipe structure according to claim 4 is the drainage pipe structure according to claim 2 or 3 , wherein the first bent portion has a radius of curvature of 100 mm or more and 140 mm or less at bending.

The drainage pipe structure according to claim 5 is the drainage pipe structure according to any one of claims 2 to 4 , wherein the first bent portion and the second bent portion are the downstream axial center of the first bent portion. The length that coincides with the upstream axis of the second bent portion is 120 mm or less.

The drainage pipe structure according to claim 6 is the drainage pipe structure according to any one of claims 1 to 5, wherein the rectifying portion is provided on the bottom side of the curved pipe portion.

According to the present invention , the transport performance can be improved.

It is a perspective view which shows the structure of the drainage pipe structure which concerns on one Embodiment of this invention. It is sectional drawing which shows typically the cross section of the 1st bending part of the drainage pipe structure. It is a side view which shows the 1st bending part of the drainage pipe structure as above. It is a perspective view which shows the conventional drainage pipe structure. (A) is a photograph showing the splash of drainage at the first elbow in this embodiment, and (b) is a photograph showing the splash of drainage at the 90-degree large bend elbow in the comparative example. (A) is a photograph showing the state of the toilet paper passing through the position 7 m downstream from the third elbow in this embodiment, and (b) is a photograph showing the state of the toilet paper passing through the position 7 m downstream from the third elbow in the comparative example. It is a photograph showing the state of the paper.

Hereinafter, the configuration of one embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a drainage pipe structure, and the drainage pipe structure 1 is connected to a flush toilet (not shown) such as a water-saving toilet, and drains water such as wash water from the toilet and transports filth and the like. Transport and discharge.

The drain pipe structure 1 includes a vertical pipe portion 2 having a nominal diameter of 75 mm connected to a toilet bowl, a first elbow 3 as a first bent portion having a nominal diameter of 75 mm connected to the downstream side of the vertical pipe portion 2, and the first elbow. A second elbow 4 as a second bent portion connected to the downstream side of the elbow 3 and a horizontal pipe portion 5 connected to the downstream side of the second elbow 4 are provided.

The nominal diameter indicates the outer diameter dimension of the pipe in the JIS standard.

Then, the transported material such as filth from the toilet bowl is transported from the vertical pipe portion 2 through the first elbow 3 and the second elbow 4 by the flow of drainage passing through the horizontal pipe portion 5, and is discharged to the outdoor drainage main pipe. Will be done.

Here, in general, the following phenomenon occurs in the transportation of the conveyed material by the flow of the drainage from the toilet bowl.

With respect to the drainage from the toilet bowl and the transported material, the momentum of the discharge from the toilet bowl and the potential energy due to the head of the vertical pipe portion 2 are the transport energy at the initial stage of discharge.

Then, the transport energy at the initial stage of transport gradually decreases due to friction in the pipes of the transported object and drainage.

However, since the substantially horizontal horizontal pipe portion 5 is actually installed at a predetermined slope (for example, pipe slope 1/100) of the drainage horizontal pipe according to the Air Conditioning and Sanitary Engineering Society Standard (SHASE-S206), the horizontal pipe portion 5 is installed. The potential energy due to the gradient becomes the final transfer energy and the transfer continues.

During transportation in the horizontal pipe portion 5, the water depth gradually becomes shallower at the front end and the rear end of the flowing drainage because the drainage spreads due to gravity with the passage of the transport time.

If the amount of washing water is sufficient, for example, 12 L or more as in a conventional toilet bowl, the conveyed material reaches the outdoor drainage main pipe before the water depth becomes too shallow, so that clogging or the like does not occur in the middle of the pipe. However, when the amount of washing water is smaller than that of a conventional toilet such as a water-saving toilet, the depth of the drainage becomes too shallow before reaching the drainage main pipe, and the transported material is not transported, causing clogging. There is.

In the present invention, it is focused on the point that the transport state of the transported material, for example, toilet paper, is important in order to reliably transport the transported material from the water-saving toilet without causing clogging. There is.

In a toilet bowl with a small amount of washing water, such as a water-saving toilet bowl, the toilet paper is not transported as if it floats in the drainage, unlike the conventional toilet bowl.

That is, since the amount of washing water in the toilet bowl is small, the toilet paper to be transported is transported while contacting the bottom portion (lower peripheral edge) of the horizontal pipe portion 5 without sufficiently floating in the drainage.

When the toilet paper becomes like a dam in the horizontal pipe portion 5, it becomes difficult for the drainage to overflow to the downstream side of the toilet paper, so that the drainage on the upstream side of the toilet paper (hereinafter referred to as rear water). .) Can delay the decrease in water depth. Therefore, even if it is applied to a toilet bowl with a small amount of washing water such as a water-saving toilet bowl, the transport performance can be improved by utilizing the propulsive force of the rear water.

On the other hand, if the toilet paper cannot be completely formed like a weir in the horizontal pipe portion 5, the rear water gradually overflows to the downstream side of the toilet paper, and the depth of the rear water decreases by that amount. , The propulsion force due to the rear water decreases. As a result, the transport performance deteriorates, and the transport of the transported material stops in the horizontal pipe portion 5.

Therefore, if it is possible to control the transported object such as toilet paper so as to spread in the width direction in the pipe and transport it in a state like a weir, the transport performance can be improved.

From this point of view, in the drainage pipe structure 1, the first elbow 3 is bent by about 90 degrees in the substantially horizontal direction from the downstream end of the vertical pipe portion 2 directly under the toilet bowl. Further, the second elbow 4 is bent approximately 90 degrees in the substantially horizontal direction from the downstream end portion of the first elbow 3. Further, the horizontal pipe portion 5 extends substantially horizontally from the downstream end portion of the second elbow 4.

The substantially horizontal direction of the first elbow 3, the second elbow 4, and the horizontal pipe portion 5 includes a gradient required for a normal drainage pipe, and includes, for example, a gradient from horizontal to 2/100. Further, approximately 90 degrees of the first elbow 3 and the second elbow 4 is a so-called 90 degree elbow used in a normal drainage pipe (DV joint in JIS K 6739, or vinyl chloride pipe / fitting association standard according to this standard. The bending angle of (VU joint) in (AS38: 2010) includes, for example, from 90 degrees to 91 degrees 40 minutes.

The vertical pipe portion 2 is a straight tubular piping member, is connected directly under the toilet bowl, and is arranged substantially vertically.

The first elbow 3 is a straight tubular pipe located at an upstream receiving port 11 capable of watertightly connecting the vertical pipe portion 2 and a downstream end which is an end opposite to the upstream receiving port 11. A downstream receiving port 12 capable of watertightly connecting the connecting pipe 14 which is a member, and a curved pipe portion 13 located between the upstream receiving port 11 and the downstream receiving port 12 and bent in an arc shape in a side view. have.

In this first elbow 3, the upstream side axis, which is the axis of the upstream side receiving port 11, and the downstream side axis, which is the axis of the downstream side receiving port 12, have a positional relationship of approximately 90 degrees, and the downstream side. The curved tube portion 13 is bent so that the receiving port 12 faces in the horizontal direction.

Further, as shown in FIGS. 2 and 3, the inner peripheral surface side of the curved tube portion 13 of the first elbow 3 has a substantially V-shaped rectifying portion 15 in a cross-sectional view.

The rectifying section 15 is arranged only on the bottom side (lower side) of the curved tube section 13. That is, in the curved tube portion 13 where the rectifying portion 15 is provided, the rectifying portion 15 is integrally provided under the arc-shaped upper surface.

The rectifying unit 15 has a substantially V-shape in cross-sectional view, that is, a parabolic shape thinner than a perfect circle in cross-sectional view, and an elliptical arc shape.

The rectifying unit 15 has an arc-shaped bottom surface 15a located on the side where the passing drainage abuts, and arc-shaped side surfaces 15b and 15c located on both sides of the bottom surface 15a.

The bottom surface 15a is an arc that is in direct contact with an imaginary circle 20a (shown by a two-dot chain line in FIG. 2, for example, φ83 mm) when extending from the arc-shaped upper surface of the rectifying unit 15 into a circular shape, and the side surface 15b. ， 15c is located inside the circle 20a.

Then, a point located outside the circle 20a at a predetermined distance from the center point of the circle 20a is set as a reference point 20d, and the reference line 20b, which is a straight line tangent to the positive contact point between the bottom surface 15a and the side surface 15b from this reference point 20d, and the reference point. The angle from the point 20d to the reference line 20c, which is a straight line in contact with the positive contact point between the bottom surface 15a and the side surface 15c, is defined as the V-shaped angle a of the rectifying unit 15.

The distances from the center point of the circle 20a to the reference point 20d are, for example, 50.2 mm, 48.0 mm, and 46.2 mm when the V-shaped angles a are 90 degrees, 100 degrees, and 110 degrees, respectively. The distance between the center point 27a of the arcuate side surface 15b and the center point 27b of the arcuate side surface 15c and the straight line orthogonal to the straight line connecting the center point of the circle 20a and the reference point 20d is 39.6 mm.

When the V-shaped angle a is less than 90 degrees and when the V-shaped angle a exceeds 110 degrees, the rectifying unit 15 does not exert an appropriate rectifying action, and the potential energy is sufficiently reduced due to turbulent flow by splashing up to the falling drainage. Since it cannot be suppressed, the transport performance cannot be sufficiently improved. Therefore, the V-shaped angle a of the rectifying unit 15 is set to 90 degrees or more and 110 degrees or less.

That is, in the rectifying unit 15, the circle 20a and the bottom surface 15a are in direct contact with each other, and the reference line 20b passing through the positive contact point between the reference point 20d and the bottom surface 15a and the side surface 15b, and the reference point 20d to the bottom surface 15a and the side surface 15c. It is molded so that the V-shaped angle a, which is the angle with the reference line 20c passing through the positive contact, is 90 degrees or more and 110 degrees or less.

The first elbow 3 may not be able to improve the transport performance when the radius of curvature r at the bending of the curved tube portion 13 is less than 100 mm and when it exceeds 140 mm. Therefore, the radius of curvature r of the curved tube portion 13 of the first elbow 3 is preferably 100 mm or more and 140 mm or less.

Further, as shown in FIG. 3, in the curved tube portion 13, the rectifying portion 15 is provided only in a part of the region. That is, the range in which the rectifying section 15 is provided in the curved tube section 13 is a range of 15 degrees from each of the end portion on the upstream side receiving port 11 side and the end portion on the downstream side receiving port 12 side.

The second elbow 4 is a general elbow body having a substantially cylindrical shape bent by approximately 90 degrees.

Such a second elbow 4 is located at an upstream receiving port 16 capable of watertightly connecting the connecting pipe 14 and a downstream end opposite to the upstream receiving port 16, and makes the horizontal pipe portion 5 watertight. It has a downstream receiving port 17 that can be connected to the above, and a curved tube portion 18 that is located between the upstream receiving port 16 and the downstream receiving port 17 and is bent in an arc shape in a side view.

In the second elbow 4, the downstream side axis, which is the axis of the downstream side receiving port 17, is approximately 90 degrees with respect to the upstream side axis, which is the axis of the upstream side receiving port 16, and the downstream side receiving port 17 Is bent so that the curved tube portion 18 faces in the horizontal direction.

The first elbow 3 and the second elbow 4 connect the downstream receiving port 12 of the first elbow 3 and the upstream receiving port 16 of the second elbow 4 via a connecting pipe 14. The connecting portion 19 is composed of the downstream receiving port 12 of the first elbow 3, the upstream receiving port 16 of the second elbow 4, and the connecting pipe 14.

At the connection portion 19, the downstream axis of the first elbow 3 and the upstream axis of the second elbow 4 coincide with each other. The length at which the downstream axis of the first elbow 3 and the upstream axis of the second elbow 4 coincide with each other is defined as the connection length c between the first elbow 3 and the second elbow 4, and the length of the connecting pipe 14. Is the connection length c.

Further, in the connection portion 19 between the first elbow 3 and the second elbow 4, the length (connection length) c at which the downstream axis of the first elbow 3 and the upstream axis of the second elbow 4 coincide with each other is set. If it exceeds 120 mm, it may not be possible to improve the transport performance. Therefore, the connection length c between the first elbow 3 and the second elbow 4 is preferably 120 mm or less.

The horizontal pipe portion 5 includes a horizontal pipe 21 which is a straight tubular piping member connected to the downstream receiving port 17 of the second elbow 4, and a third elbow 22 as a third bending portion connected to the horizontal pipe 21. It has a horizontal pipe 23 connected to the third elbow 22.

That is, the horizontal pipe portion 5 connects one end of the horizontal pipe 21 to the downstream receiving port 17 of the second elbow 4, and connects the other end of the horizontal pipe 21 to the upstream side of the third elbow 22 as the third bent portion. Connect the socket 24. Further, the horizontal pipe 23 is connected to the downstream receiving port 25 of the third elbow 22. The horizontal pipe 23 connects the straight tubular piping members to each other via the connection socket 26.

Next, the operation and effect of the above embodiment will be described.

According to the drainage pipe structure 1, the drainage that flows so as to fall through the vertical pipe portion 2 flows along the substantially V-shaped rectifying portion 15 in the first elbow 3 in a cross-sectional view. By the rectifying action, it is possible to suppress the splashing of the wastewater when it falls, and to suppress the scattering and turbulence of the flowing wastewater. Therefore, the potential energy based on the head of the vertical pipe portion 2 is less likely to be lost, drainage can be smoothly performed, and the potential energy can be more reliably acted on the conveyed object as the conveyed energy.

Further, since the second elbow 4 is bent approximately 90 degrees in the substantially horizontal direction with respect to the downstream receiving port 12 of the first elbow 3, the conveyed object passes through the first elbow 3 and the second elbow 4. When a force is sometimes applied in the rotation direction, it tends to spread in the width direction, so that it easily acts like a weir against the flowing drainage, and the propulsive force of the rear water of the transported object can be used more reliably during transportation. Therefore, the potential energy of the wastewater whose loss during flow is suppressed by the rectifying unit 15 can be easily applied as a propulsive force to the transported object.

Therefore, according to the drainage pipe structure 1, the generation of turbulent flow is suppressed as described above even in a toilet bowl having a small amount of washing water and a disadvantageous condition for transport performance, such as a tankless water-saving toilet bowl. Since the decrease in potential energy is suppressed and the transported object spreads in the width direction in the pipe, the propulsive force of the rear water behind the transported object can be fully utilized to improve the transport performance. In addition, if the drainage pipe structure 1 is installed at the stage of constructing the piping structure for drainage from the toilet bowl, the water-saving toilet bowl will not be installed at that time, and the water-saving toilet bowl will be installed in the future. Even in this case, the drainage pipe structure 1 can be used as it is, and future change work such as remodeling becomes easy.

Further, since the V-shaped angle a of the rectifying unit 15 is 90 degrees or more and 110 degrees or less, the rectifying action of the rectifying unit 15 can suppress the splashing and scattering of wastewater, and the transport performance can be improved.

Since the radius of curvature r at the bent portion of the first elbow 3 is 100 mm or more and 140 mm or less, drainage can flow smoothly by utilizing the potential energy in the vertical pipe portion 2, and the transport performance can be improved.

Since the connection length c at the connection portion 19 between the first elbow 3 and the second elbow 4 is 120 mm or less, drainage flows from the first elbow 3 to the second elbow 4 while the transport energy is high. The force acts effectively in the direction of rotation, and the transport performance can be improved.

It should be noted that, as in the above embodiment, the configuration in which the radius of curvature r of the first elbow 3 is 100 mm or more and 140 mm or less is preferable, but the configuration is not limited to such a configuration, and the radius of curvature r of the first elbow 3 is It can be decided as appropriate.

Further, a configuration in which the connection length c of the connection portion 19 between the first elbow 3 and the second elbow 4 is 120 mm or less is preferable, but the configuration is not limited to such a configuration, and the first elbow 3 and the second elbow 4 are not limited to such a configuration. The configuration of the connection portion with and can be appropriately determined.

Hereinafter, Examples and Comparative Examples according to the present invention will be described.

Considering the application to water-saving toilets, it is better to evaluate the transport performance by the old BL standard than by the new BL standard, so that the occurrence of clogging can be prevented more reliably. confirmed.

First, as the transport medium, 6 sheets of 1 m of toilet paper satisfying JIS P 4501 were stacked and folded in eight.

For reference, according to the new BL standard, toilet paper 90 cm satisfying JIS P 4501 is folded in eight and four sheets are stacked.

The drainage method is to insert the transport media into a cylinder with an inner diameter of 40 mm in a rolled state, completely immerse the tip of this cylinder in the water of the toilet bowl for 15 seconds, remove the cylinder, and immediately drain the large amount of water (for stool). Drainage) was performed.

The transport distance in the pipe was the distance from the joint directly under the toilet bowl to the end of the transport media in the stopped state.

Here, according to the old BL standard, the average transport distance of 3 times is evaluated by excluding the maximum value and the minimum value from each transport distance of 5 times of drainage test, and this transport distance is 10 m or more. If so, it is judged that the transport performance is satisfied.

However, in order to suppress the influence of variation as much as possible and evaluate the transport performance as accurately as possible, the drainage pipe structure 1 (Example) shown in FIG. 1 and the conventional drainage pipe structure 31 (comparative example) shown in FIG. 4 are used. The drainage test was performed 50 times under each test condition, and the median value of each test result was used as the transport distance without excluding the maximum and minimum values of each test result (transport distance), and the transport distance was 10 m or more. In some cases, it was evaluated as satisfying the transport performance.

In the drainage pipe structure 1 of the embodiment, the upstream side receiving port 11 of the first elbow 3 is connected to the lower part of the vertical pipe portion 2 having a length of 300 mm directly under the toilet bowl, and the downstream side receiving port 12 of the first elbow 3 is connected to the drainage pipe structure 1. One end of the connecting pipe 14 was connected. Further, the upstream receiving port 16 of the second elbow 4 was connected to the other end of the connecting pipe 14. Further, one end of a 1 m horizontal tube 21 having a straight tube was connected to the downstream receiving port 17 of the second elbow 4. Further, the upstream receiving port 24 of the third elbow 22 as the third bending portion is connected to the other end of the horizontal pipe 21, and the 21m horizontal pipe 23 is connected to the downstream receiving port 25 of the third elbow 22. Connected via.

As the second elbow 4 and the third elbow 22, 90-degree large bend elbows of the PVC pipe and joint association standard (AS38: 2010) were used. Further, the nominal diameter of each pipe is 75 mm, and the pipe gradient of the horizontal pipe portion 5 is 1/100.

In the conventional drainage pipe structure 31, which is a comparative example, an elbow 32 is connected instead of the first elbow 3 and the second elbow 4 with respect to the embodiment. That is, the vertical pipe portion 2 was connected to the upstream receiving port 33 of the elbow 32, and the horizontal pipe 21 was connected to the downstream receiving port 34 of the elbow 32. For the elbow 32, a 90-degree large bend elbow of the PVC pipe and fitting association standard (AS38: 2010) was used.

[Test 1]
In order to confirm the difference in transport performance depending on the type of water-saving toilet, the V-shaped angle a is 100 degrees, the radius of curvature r is 120 mm, the length of the connecting pipe 14 (connection length c) is 40 mm, and A to A drainage test was performed on the toilet bowl of C.

In the toilet type A, the cleaning method is tornado cleaning (siphon type), and the amount of cleaning water is 3.8 liters. The toilet type B has a turn trap type cleaning method and a cleaning water volume of 4.8 liters. The toilet bowl type C has a direct valve cleaning method and a cleaning water volume of 5.0 liters.

The results of these drainage tests are shown in Table 1.

As shown in Table 1, in the example using the drainage pipe structure 1, the transport distance was 10 m or more in each of the toilet bowl types A to C. On the other hand, in the comparative example using the conventional drainage pipe structure 31, the transport distance was less than 10 m in each of the toilet bowl types A to C.

When conducting a test under other conditions, if sufficient transport performance can be confirmed for the toilet type A, which has the strictest conditions in terms of the amount of washing water, from the results of test 1, the transport performance will be sufficient even for other types of toilets. Considering that it can be secured, in Tests 2 to 6, only the toilet bowl of A was used for the drainage pipe structure 1 as an example.

[Test 2]
In order to examine the optimum V-shaped angle a, the radius of curvature r was set to 120 mm, the length of the connecting pipe 14 (connection length c) was set to 40 mm, and the change in the transport distance due to the difference in the V-shaped angle a was confirmed.

Table 2 shows the V-shaped angle a and the transport distance that were tested.

As shown in Table 2, when the V-shaped angle a is 90 to 110 degrees, the transport distance is 10 m or more, and the best result is particularly good when the V-shaped angle a is 100 degrees.

[Test 3]
When the V-shaped angle a of the rectifying unit 15 is 100 degrees, the radius of curvature r is 120 mm, and the length (connection length c) of the connecting tube 14 is 40 mm, the number of shots shows the rectifying action in the first elbow 3. The analysis was performed by shooting with a high-speed camera of 1000 / s.

For comparison, the conventional drainage pipe structure 31, which is a comparative example, was also photographed with a high-speed camera.

In both the examples and the comparative examples, transparent pipes were used so that the flow state of the wastewater could be easily confirmed by photographing.

For these Examples and Comparative Examples, a photograph 1 second after the start of drainage from the toilet bowl is shown in FIG. FIG. 5A is a photograph of the drainage pipe structure 1 as an example, showing the jumping up in the first elbow 3. Further, FIG. 5B is a photograph of the conventional drainage pipe structure 31 which is a comparative example, and shows a jump in the elbow 32 which is a 90-degree large bending elbow. In both FIGS. 5 (a) and 5 (b), the photograph on the right is an enlargement of part A of the photograph on the left.

The small arrows in the figure indicate the flow vector of the drainage at each point, but in the conventional drainage pipe structure 31 of FIG. 5B, it can be confirmed that the flow vectors are scattered throughout the pipe and there is a lot of jumping up.

On the other hand, in the drainage pipe structure 1 shown in FIG. 5A, it can be confirmed that the flow vectors are gathered in the lower half of the pipe and the jump is small, and the directions of the flow vectors are almost the same. ..

Therefore, it can be confirmed that the drainage pipe structure 1 suppresses the splashing and scattering of the drainage as compared with the conventional drainage pipe structure 31, the drainage is smoothly performed, and the rectifying action is good.

Further, FIG. 6 shows a photograph of the state of the toilet paper at a position 7 m downstream from the third elbow 22 in this drainage test. FIG. 6A is a photograph of toilet paper passing through a position 7 m downstream from the third elbow 22 in the drainage pipe structure 1 as an example, and FIG. 6B is a comparative example in the conventional drainage pipe structure 31. It is a photograph of toilet paper passing through a position 7 m downstream from the third elbow 22.

In the conventional drain pipe structure 31 of FIG. 6 (b), the lateral length of the toilet paper with respect to the flow direction, that is, the length in the width direction is 60 mm, whereas the drain pipe structure 1 of FIG. 6 (a) Then, the length of the toilet paper in the width direction was extended to 70 mm.

Therefore, it can be confirmed that the drainage pipe structure 1 can easily spread the toilet paper flowing in the pipe and suppress the overflow of the rear water as compared with the conventional drainage pipe structure 31.

[Test 4]
When the V-shaped angle a of the first elbow 3 is 100 degrees and the length (connection length c) of the connecting pipe 14 is 40 mm, the change in the transport distance due to the difference in the radius of curvature r of the first elbow 3 is confirmed. did. Table 3 shows the transport distance at each radius of curvature r.

As shown in Table 3, the transport distance was good when the radius of curvature r was 100 to 140 mm, and the transport distance was the longest especially when the radius of curvature r was 120 mm.

[Test 5]
When the V-shaped angle a of the first elbow 3 was 100 degrees and the radius of curvature r was 120 mm, the change in the transport distance due to the difference in the length (connection length c) of the connecting pipe 14 was confirmed. Table 4 shows the transport distances at each connection length c.

As shown in Table 4, the transport distance becomes shorter as the connection length c between the first elbow 3 and the second elbow 4 increases from 40 mm, and the transport distance becomes shorter when the length of the connecting pipe 14 is 120 mm or less. It was good.

From the results of Tests 1 to 5, the transport distance is the longest when the V-shaped angle a of the rectifying unit 15 is 100 degrees, the radius of curvature r of the first elbow 3 is 120 mm, and the length of the connecting pipe 14 is 40 mm. I was able to confirm that it would be longer.

[Test 6]
In the above tests 1 to 5, the transport distance was confirmed for the combination of the conditions in which the transport distance was preferable. That is, each combination of the conditions of the V-shaped angle a (90 to 110 degrees) of the rectifying unit 15, the radius of curvature r (100 to 140 mm) of the first elbow 3, and the length of the connecting tube 14 (40 to 120 mm). A drainage test was conducted at the site to confirm the transport distance.

First, when the length of the connecting pipe 14 is 40 mm, the V-shaped angle a of the rectifying unit 15 is set to either 90 degrees, 100 degrees, or 110 degrees, and the radius of curvature r of the first elbow 3 is 100 mm, 120 mm, and 140 mm. The results of the drainage test are shown in Table 5.

When the length of the connecting pipe 14 is 80 mm, the V-shaped angle a of the rectifying unit 15 is 90 degrees, 100 degrees, or 110 degrees, and the radius of curvature r of the first elbow 3 is 100 mm, 120 mm, and 140 mm. The results of the drainage test are shown in Table 6.

Further, when the length of the connecting pipe 14 is 120 mm, the V-shaped angle a of the rectifying unit 15 is set to any of 90 degrees, 100 degrees and 110 degrees, and the radius of curvature r of the first elbow 3 is 100 mm, 120 mm and 140 mm. The results of the drainage test are shown in Table 7.

As shown in Tables 5 to 7, the V-shaped angle a of the rectifying unit 15 is 90 degrees, 100 degrees, or 110 degrees, and the radius of curvature r of the first elbow 3 is 100 mm, 120 mm, or 140 mm. When the length of the connecting pipe 14 was 40 mm, 80 mm, or 120 mm, the transport distance was good regardless of the combination of conditions.

1 Drainage pipe structure 2 Vertical pipe part 3 First elbow as the first bent part 4 Second elbow as the second bent part
15 rectifying part a V-shaped angle r radius of curvature c The connection length is the length at which the downstream axis of the first bending part and the upstream axis of the second bending part match.

Claims (6)

It is a drainage pipe structure that discharges drainage.
It is provided with a substantially V-shaped rectifying section in a cross-sectional view located in the middle of the drainage pipe structure.
The drainage pipe structure is characterized in that the rectifying portion is provided in at least a part of the curved pipe portion excluding the end portion on the upstream side connection port side and the end portion on the downstream side connection port side . It is a drainage pipe structure that drains drainage from the toilet bowl.
The vertical pipe part connected to the toilet bowl and
The first bent portion connected to the downstream side of this vertical pipe portion and
A second bent portion connected to the downstream side of the first bent portion is provided.
The first bent portion is
The upstream connection port located at the upstream end,
The downstream connection port located at the downstream end,
It has a curved pipe portion located between the upstream side connection port and the downstream side connection port.
At least the curved pipe portion that is a part of the pipeline from the vertical pipe portion to the second bent portion , excluding the end portion on the upstream side connection port side and the end portion on the downstream side connection port side. A drainage pipe structure characterized in that a substantially V-shaped rectifying section is provided in a part of the area in a cross-sectional view. It is a drainage pipe structure that drains drainage from the toilet bowl.
The vertical pipe part connected to the toilet bowl and
A first bent portion that is connected to the downstream side of the vertical pipe portion and bends from the downstream end portion of the vertical pipe portion.
It is provided with a second bent portion that is connected to the downstream side of the first bent portion and bends in a substantially horizontal direction from the downstream end portion of the first bent portion.
The first bent portion is
The upstream connection port located at the upstream end,
The downstream connection port located at the downstream end,
It has a curved tube portion located between the upstream side connection port and the downstream side connection port and provided with a substantially V-shaped rectifying portion on the inner peripheral surface in a cross-sectional view.
The rectifying portion is provided in at least a part of the curved pipe portion excluding the end portion on the upstream side connection port side and the end portion on the downstream side connection port side, and the side on which the passing drainage abuts. It has an arc-shaped bottom surface located at, and an arc-shaped side surface located on both sides of this bottom surface and different from the bottom surface.
The drainage pipe structure is characterized by that. In the first bent portion, the radius of curvature of the curved tube portion bent in an arc shape in a side view is 100 mm or more and 140 mm or less.
The straightening part is bent in an arc shape when viewed from the side.
The drainage pipe structure according to claim 2 or 3, wherein the drainage pipe structure is characterized. The length of the first bent portion and the second bent portion is 120 mm or less so that the downstream axis of the first bent portion and the upstream axis of the second bent portion coincide with each other.
Both the upstream side connection port and the downstream side connection port of the first bent portion are formed in a substantially cylindrical shape.
The drainage pipe structure according to any one of claims 2 to 4, wherein the drainage pipe structure is characterized. The rectifying section is provided on the bottom side of the curved tube section.
The region on the upstream side of the curved tube portion is formed in a substantially cylindrical shape toward the upstream side connection port side in an enlarged diameter.
The area on the downstream side of the curved tube portion is formed in a substantially cylindrical shape toward the downstream side connection port side in an enlarged diameter.
The drainage pipe structure according to any one of claims 1 to 5, wherein the drainage pipe structure is characterized.

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