JP4484989B2 - Discharge structure of swirling flow pipe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a discharge structure for a swirling flow tube.
[0002]
[Prior art]
In order to eliminate inundation damage caused by rainwater in urban areas, a part of rainwater that has fallen during heavy rain is temporarily stored in a large storage room located underground, and when the water level of the river drops, the water stored in the storage room A facility for inundation countermeasures is currently planned to pump up the water and discharge it to the river.
[0003]
In the above-mentioned inundation countermeasure facility, as a structure for dropping water by guiding a length of 10 to 50 m between a water collecting pipe for collecting rainwater and a lower horizontal pipe communicating with a storage chamber provided deep underground, FIG. And a swirl tube as shown in FIG.
[0004]
On the other hand, a swirl flow tube has been studied as a device for dropping rain water or other water into a lower horizontal pipe for guiding it to a drainage underground discharge pipe provided deep underground.
[0005]
FIGS. 5 and 6 show an example of a swirl flow pipe. A vertical pipe having an upper end connected to an inflow portion 1a of a water collecting pipe 1 for sending a fluid such as rainwater from a water diversion facility (not shown). 2 and a swirling guide plate 3 is provided inside the pipe 2 to form a swirling flow pipe 4, and the lower end of the swirling flow pipe 4 extends in the horizontal direction and communicates with an underground discharge pipe and a storage chamber (not shown). The lower horizontal pipe 5 is connected.
[0006]
In the swirl flow tube 4, when a fluid such as rainwater flows in from the upper end, the fluid turns into a swirl flow by the swirl guide plate 3 provided inside the swirl flow tube 4, and the swirl flow is maintained while the swirl flow is maintained. The fluid flows down to the lower end of the tube 4 and is discharged from the lower end portion of the swirling flow tube 4 to the lower horizontal tube 5. The fluid discharged to the lower horizontal tube 5 joins the lower horizontal flow 6 flowing in the lower horizontal tube 5. Then, it is guided and stored in an underground discharge pipe or a storage chamber (not shown).
[0007]
As described above, when the fluid is swirled down by the swirling flow tube 4, the falling energy of the fluid can be reduced, and therefore, the drop landing of the fluid discharged from the swirling flow tube 4 to the lower horizontal tube 5 can be reduced. Since the impact force in the water portion can be reduced to some extent, a large amount of fluid can be smoothly passed through the lower horizontal pipe 5 in a short time.
[0008]
[Problems to be solved by the invention]
However, the conventional swirling flow tube 4 as described above has a structure in which the swirling flow is directly discharged from the lower end of the swirling flow tube 4 to the lower horizontal tube 5. Since the flow component in the direction opposite to the flow direction is also included, there is a concern of affecting the lower horizontal flow 6.
[0009]
As shown in FIG. 7, if the pipe 2 is inclined rather than vertical and connected to the lower horizontal pipe 5, the impact force at the falling and landing portion of the fluid discharged from the pipe 2 to the lower horizontal pipe 5 is reduced. Although there is no fear of affecting the lower horizontal flow 6, in this case, a large amount of extra space is required and wasteful, and as shown in FIG. Although it is possible to provide an L-shaped nozzle 7 bent in the flow direction 6, in this case, the flow area of the lower horizontal pipe 5 becomes narrow, and the lower horizontal flow 6 may be obstructed. Both had problems.
[0010]
In view of such circumstances, the present invention does not require a lot of extra space, while reducing the impact of the fluid flowing down from the vertical swirling flow pipe and minimizing the influence on the lower horizontal flow, It is an object of the present invention to provide a discharge structure for a swirl flow tube that can be stably combined with a lower horizontal flow.
[0011]
[Means for Solving the Problems]
The present invention is a discharge structure for a swirling flow pipe in which a swirling guide plate is provided inside a pipe extending in the vertical direction so that a fluid flowing in from the upper end flows down while swirling and joins a lower horizontal flow,
When the end position of the swivel guide plate is set at the lower end of the swirl flow tube and the straight direction extending from the center of the swirl flow tube to the downstream side in the flow direction of the lower horizontal flow when viewed in plan is 0 ° The present invention relates to a discharge structure for a swirl flow tube, characterized in that the end position of the swivel guide plate is within a range of 90 ° to 180 ° in the direction.
[0012]
In the discharge structure of the swirl flow tube, the fluid that is within the range of 0 ° to 90 ° in the swirl direction and passes the terminal position of the swirl guide plate below the swivel guide plate at the lower end of the swirl flow tube. It is desirable to provide a rotation stop plate that stops the rotation flow.
[0013]
Further, a resistance plate that weakens the swirling flow of the fluid on the center side of the swirling flow tube may be provided on the center side of the swirling flow tube at the terminal position of the swirling guide plate.
[0014]
According to the above means, the following operation can be obtained.
[0015]
When a fluid such as rainwater flows in from the upper end, the fluid is swirled by a swirl guide plate provided inside the swirl flow tube, and flows into the swirl flow tube as a swirl flow, at the lower end of the swirl flow tube. It is discharged from the end position of the swirl guide plate and merges with the lower horizontal flow.The end position of the swirl guide plate is set at the lower end of the swirl flow tube, and the lower horizontal flow from the center of the swirl flow tube is viewed in plan view. When the linear direction extending downstream in the flow direction is set to 0 °, if the end position of the swivel guide plate is in the range of 90 ° to 180 ° in the anti-turning direction, the discharge flow from the swirling flow pipe The flow component in the direction opposite to the flow direction of the lower horizontal flow is reduced, and most of the flow component flows out along the flow direction of the lower horizontal flow.
[0016]
Further, a swivel stop plate that stops swirling flow of the fluid that has passed through the terminal position of the swivel guide plate is located in the swivel direction within the range of 0 ° to 90 ° and below the swivel guide plate at the lower end of the swirl flow tube. Is provided, the flow component in the direction opposite to the flow direction of the lower horizontal flow remaining in the discharge flow from the swirl flow tube is blocked by the swirl stop plate, and flows along the flow direction of the lower horizontal flow.
[0017]
Depending on the installation position of the anti-rotation plate, the interval of the anti-rotation plate with respect to the end position of the anti-rotation guide plate may be shortened, creating a vortex in front of the anti-rotation plate, and a new flow in the direction opposite to the flow direction of the lower horizontal flow. If a resistance plate that weakens the swirling flow of the fluid on the center side of the swirling flow tube is provided on the center side of the swirling flow tube at the end position of the swiveling guide plate, a component may be generated. Therefore, vortices are difficult to be generated, and new flow components in the direction opposite to the flow direction of the lower horizontal flow are not generated.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0019]
1 and 2 show an example of an embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 5 and 6 denote the same components, and the basic configuration is shown in FIGS. 6 is the same as the conventional one shown in FIG. 6, but the feature of this example is that the end position of the swiveling guide plate 3 is set at the lower end of the swirling flow tube 4 as shown in FIGS. When the straight line direction extending from the center of the swirling flow tube 4 to the downstream side in the flow direction of the lower horizontal flow 6 is 0 ° when viewed in a plan view, it is 135 ° in the counter-turning direction (clockwise direction in the example in the figure). In the drawing, it is shown as a minus side.) The end position of the turning guide plate 3 is at the position.
[0020]
On the other hand, at a position of 45 ° (shown as a plus side in the drawing) in the turning direction (counterclockwise direction in the drawing) and below the turning guide plate 3 at the lower end of the turning flow tube 4. Is provided with a swivel stop plate 8 that stops the swirling flow of the fluid that has passed through the end position of the swivel guide plate 3.
[0021]
Further, a resistance plate 9 that weakens the swirling flow of the fluid on the center side of the swirling flow tube 4 is provided on the center side of the swirling flow tube 4 at the terminal position of the swirling guide plate 3. The width W of the resistance plate 9 is about 0.25R to 0.3R, where R is the radius on the inner surface of the swirling flow tube 4.
[0022]
Further, a central tube 10 having an upper end opened in the upper part in the inflow portion 1a and a lower end opened in the lower horizontal tube 5 is disposed at the center of the turning guide plate 3, and the upper portion of the central tube 10 is a frame. 11 to be supported by the inflow portion 1a.
[0023]
Next, the operation of the illustrated example will be described.
[0024]
When a fluid such as rainwater flows in from the upper end, the fluid is swirled by a swirl guide plate 3 provided in the swirl flow tube 4 and flows down in the swirl flow tube 4 as a swirl flow. 4 is discharged into the lower horizontal pipe 5 from the end position of the swiveling guide plate 3 at the lower end of 4 and merges with the lower horizontal flow 6, but the end position of the swiveling guide plate 3 is set at the lower end of the swirling flow pipe 4 and is flat. When the straight direction extending from the center of the swirling flow pipe 4 to the downstream side in the flow direction of the lower horizontal flow 6 is defined as 0 °, the end position of the swiveling guide plate 3 at a position of −135 ° in the anti-turning direction. If the configuration is such that the discharge flow from the swirling flow pipe 4 has less flow components in the direction opposite to the flow direction of the lower horizontal flow 6, most of it flows out along the flow direction of the lower horizontal flow 6. It becomes the form to do. Since the lower end of the central tube 10 is opened in the lower horizontal tube 5, the air separated from the fluid in the lower horizontal tube 5 is effectively discharged to the upper part through the inside of the central tube 10.
[0025]
Further, a swivel stop plate 8 that stops the swirling flow of the fluid that has passed through the terminal position of the swivel guide plate 3 at a position of + 45 ° in the swirl direction and below the swivel guide plate 3 at the lower end of the swirl flow tube 4. Is provided, the flow component in the direction opposite to the flow direction of the lower horizontal flow 6 remaining in the discharge flow from the swirl flow pipe 4 is blocked by the swirl stop plate 8 and follows the flow direction of the lower horizontal flow 6. It becomes a flow.
[0026]
In the experiment in which the reduced scale model for the actual machine was used and VTR photographing and visual flow observation were performed, as shown in FIG. 2, the end position of the turning guide plate 3 was set at a position of −135 °, and the turning stop plate It has been confirmed that the influence on the lower horizontal flow 6 can be minimized when the installation position 8 is set to + 45 °. However, the end position of the turning guide plate 3 and the installation position of the turning stop plate 8 are confirmed. Needless to say, the end position of the swivel guide plate 3 is in a range of ± 45 ° with respect to the position of −135 °, that is, −90 ° to −180. The swivel stop plate 8 can be placed in a range of ± 45 °, that is, in a range of 0 ° to + 90 °, with respect to the + 45 ° position.
[0027]
For example, as the flow velocity and flow rate of the fluid increase, the swirl force of the swirl flow increases, so that the end position of the swivel guide plate 3 is brought closer to the position of −180 °, and the installation position of the swivel stop plate 8 is moved to the position of + 90 °. As the flow velocity and flow rate of the fluid decrease, the swirl force of the swirl flow becomes weaker. Therefore, the end position of the swivel guide plate 3 approaches -90 °, and the swivel stop plate 8 The installation position should be close to 0 °.
[0028]
In the case of the illustrated example, the swirling direction of the swirling flow is counterclockwise as viewed from above, and therefore the end position of the swiveling guide plate 3 is in the range of −90 ° to −180 ° in FIG. The installation position of the turning stop plate 8 is in the range of 0 ° to + 90 ° in FIG. 2, but when the turning direction is clockwise when viewed from above, the end of the turning guide plate 3 is located. The position is in the range of + 90 ° to + 180 ° in FIG. 2, and the installation position of the anti-rotation plate 8 is in the range of 0 ° to −90 ° in FIG.
[0029]
Depending on the installation position of the swivel stop plate 8, the distance between the swivel stop plate 8 with respect to the end position of the swivel guide plate 3 is shortened, and a vortex is formed in front of the swivel stop plate 8, opposite to the flow direction of the lower horizontal flow 6. However, a resistance plate 9 that weakens the swirling flow of the fluid on the center side of the swirling flow tube 4 is provided on the center side of the swirling flow tube 4 at the end position of the swirling guide plate 3. If it is provided, it becomes difficult for the vortex to be formed in front of the anti-rotation plate 8, and a new flow component in the direction opposite to the flow direction of the lower horizontal flow 6 is not generated.
[0030]
In this way, the fluid flowing down from the vertical swirling flow pipe 4 is stable against the lower horizontal flow while reducing the impact and minimizing the influence on the lower horizontal flow 6 without requiring much extra space. And can be merged.
[0031]
In addition, the discharge structure of the swirling flow tube of the present invention is not limited to the above-described examples. As shown in FIGS. 3 and 4, the lower horizontal tube 5 is connected to both ends and the lower horizontal flow is internally provided. The present invention can be applied to an apparatus in which the lower end of the swirl flow pipe 4 is connected to the upper part of the block 12 through which the flow of the pipe 6 is circulated, and equivalent performance can be obtained without the central pipe 10. Of course, various modifications can be made without departing from the scope of the present invention.
[0032]
【The invention's effect】
As described above, according to the swirl flow tube discharge structure of the present invention, the fluid flowing down from the vertical swirl flow tube is reduced in impact and reduced to the lower horizontal flow without requiring much extra space. The effect of being able to make it merge stably with respect to a lower horizontal flow can be show | played, suppressing the influence of this to the minimum.
[Brief description of the drawings]
FIG. 1 is a sectional view of an example of an embodiment for carrying out the present invention.
FIG. 2 is a view taken in the direction of arrows II-II in FIG.
FIG. 3 is a sectional view of a modification of the embodiment for carrying out the present invention.
4 is a view taken along arrow IV-IV in FIG. 3;
FIG. 5 is a cross-sectional view showing an example of the prior art.
6 is a view taken in the direction of the arrow VI in FIG. 5;
FIG. 7 is a cross-sectional view showing another conventional example.
FIG. 8 is a sectional view showing still another conventional example.
[Explanation of symbols]
2 Tube 3 Swiveling guide plate 4 Swirling flow tube 6 Lower horizontal flow 8 Swing stop plate 9 Resistance plate

Claims (3)

A discharge structure for a swirling flow pipe in which a swiveling guide plate is provided inside a pipe extending in the vertical direction so that the fluid flowing in from the upper end flows down while swirling and joins the lower horizontal flow,
When the end position of the swivel guide plate is set at the lower end of the swirl flow tube and the straight direction extending from the center of the swirl flow tube to the downstream side in the flow direction of the lower horizontal flow when viewed in plan is 0 ° A discharge structure for a swirl flow tube, characterized in that the end position of the swivel guide plate is within a range of 90 ° to 180 ° in the direction. A swivel stop plate that stops the swirl flow of the fluid that has passed through the terminal position of the swivel guide plate is provided below the swivel guide plate within the range of 0 ° to 90 ° in the swirl direction and at the lower end of the swirl flow tube. The discharge structure for a swirling flow tube according to claim 1. The discharge structure of a swirl flow tube according to claim 2, wherein a resistance plate that weakens the swirl flow of the fluid on the center side of the swirl flow tube is provided on the center side of the swirl flow tube at the end position of the swirl guide plate.

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