JP2001073439A - Discharging structure for swirl flow pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a shock from fluid to a lower horizontal pipe by forming a space part having no swirl guide board in the lower end inside of a swirl flow pipe and connecting the lower end of the swirl flow pipe to the lower horizontal tube via a throttle type part. SOLUTION: Inside a pipe 2 connected to a liquid collecting pipe 1 via an inflow part 1a in the upper end and extended downward vertically, the swirl flow pipe 6 is provided with a swirl guide board 3 integrated with a central pipe 7 arranged in the center. Inside the lower end of the swirl flow pipe 6, a predetermined-length space part 8 having no swirl guide board 3 is formed, and in the lower end of the space part 8, a throttle type part 9 with a cross section area smaller than the inside cross section area of the swirl flow pipe 6 is formed so as to be connected to a lower horizontal pipe 5 extending horizontally. Fluid such as rainwater flowing inside from the upper end is flushed downward while swirling by means of the swirl guide board 3 so as to reach the space part 8. The fluid temporarily staying in the space part 8 and consuming swirl energy further consumes the swirl energy in the throttle type part 9, and then, it gently reaches the lower horizontal pipe 5 while dispersed in the skirt form. In this way, a shock of fluid is damped, and damage in the lower horizontal pipe 5 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge structure for a swirling flow tube, and more particularly, to a structure for reducing the impact force of water flowing from a vertical swirling flow tube to a lower horizontal tube with a simple structure. Also, the present invention relates to a discharge structure of a swirling flow tube which stabilizes outflow of water to a lower horizontal tube and suppresses the inflow of air.

[0002]

2. Description of the Related Art In order to eliminate inundation damage caused by rainwater in urban areas, part of rainwater that has fallen during heavy rains is temporarily stored in a large-scale storage room provided underground, and when the water level of the river drops, An inundation countermeasure facility that pumps the water stored in the storage room and discharges it to the river is currently being planned.

[0003] In the above-mentioned inundation countermeasure facility, a structure is provided in which water is guided by guiding over a distance of 100 to 200 m between a water collecting pipe for collecting rainwater and a lower horizontal pipe communicating with a storage room provided deep underground. A swirling flow tube as shown in FIGS.

FIGS. 10 and 11 show an example of a swirling flow pipe. A vertical flow pipe connected to the upper end of an inflow portion 1a of a liquid collecting pipe 1 for sending a fluid such as rainwater from a diversion facility (not shown). And a swirl guide plate 3 is provided inside the tube 2 to form a swirl flow tube 4. The lower end of the swirl flow tube 4 extends horizontally and communicates with a storage chamber (not shown). Horizontal pipe 5
Connected to

In the swirling flow tube 4, when a fluid such as rainwater flows in from the upper end, the fluid is swirled by the swirling guide plate 3 provided inside the swirling flow tube 4, and the swirling flow is maintained. Flows down to the lower end of the swirling flow pipe 4 and is discharged from the lower end of the swirling flow pipe 4 to the lower horizontal pipe 5, and the fluid discharged to the lower horizontal pipe 5 is guided to a storage chamber (not shown) and stored therein.

As described above, when the fluid is swirled by the swirling flow tube 4 and caused to flow down, the falling energy of the fluid can be reduced, and the fluid discharged from the swirling flow tube 4 to the lower horizontal tube 5 can be reduced. Therefore, a large amount of fluid can flow smoothly to the lower horizontal pipe 5 in a short time since the impact force at the falling landing portion can be reduced to some extent.

[0007]

However, the conventional swirling flow tube 4 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. As shown in FIG. 10 and FIG. 11, the swirling flow collides with the inner wall of the lower horizontal pipe 5 while maintaining the swirling force, and since the impact force is large, the lower horizontal pipe 5 is vibrated. There was a possibility that strength problems such as generation of vibration noise and damage would occur.

Further, the fluid discharged from the lower end of the swirl flow tube 4 pulsates and hits the inner wall of the lower horizontal tube 5 in an air hammer manner while maintaining the swirl, so that the lower horizontal tube 5
There is a problem that the air mixing rate into the fluid in the inside increases, and this air is sent to the storage chamber, so that the amount of liquid stored in the storage chamber decreases.

In view of the above-mentioned circumstances, the present invention can stabilize the outflow of fluid from a vertical swirling flow pipe to a lower horizontal pipe with a simple configuration, and reduce the impact force on the lower horizontal pipe. It is an object of the present invention to provide a swirling flow tube discharge structure capable of suppressing the incorporation of air.

[0010]

According to the present invention, there is provided a swirling flow tube provided with a swirling guide plate inside a vertically extending tube so as to swirl a fluid flowing from an upper end to a lower horizontal tube at a lower end. Wherein a space portion having no swirl guide plate is formed inside the lower end of the swirl flow tube, and the lower end of the swirl flow tube is connected to the lower horizontal tube via a throttle-shaped portion. Discharge structure of a swirling flow tube.

In the above means, a swirl resistance plate which resists swirling flow may be provided in the space, or a center tube is provided in the swirl guide plate, and a lower end of the center tube is opened to the space. Alternatively, an L-shaped tube may be provided below the constriction-shaped portion so as to be bent from the vertical direction in the axial direction of the lower horizontal tube.

According to the above means, the following effects can be obtained.

Since the space portion without the swirl guide plate is formed at the lower end of the swirling flow tube, the fluid discharged into the space portion is temporarily retained in the space portion, so that the swirling energy can be effectively consumed. At this time, if a turning resistance plate is provided in the space, the turning force of the fluid is further weakened by the turning resistance plate, so that the turning energy of the fluid discharged into the space can be more effectively consumed. .

The fluid discharged into the space increases the pressure in the swirling flow pipe due to the narrowed flow path by the throttle-shaped portion, thereby further consuming the swirling energy and causing the fluid to flow in the space. This effectively separates the air mixed into the fluid. At this time, if the lower end of the center tube is open in the space, the separated air is effectively discharged to the upper portion through the inside of the center tube.

The fluid that has passed through the throttle-shaped portion is diffused in a skirt shape with respect to the lower horizontal pipe and is gradually discharged, so that it does not collide with the inner wall of the lower horizontal pipe in a directional manner. Therefore, it is possible to reduce the problem that the lower horizontal pipe vibrates or generates a vibration sound, and it is possible to prevent the lower horizontal pipe from being damaged.

Further, since the swirling of the fluid is suppressed by the space portion and the swirling resistance plate, and the air in the fluid is effectively separated by the pressure loss by the throttle-shaped portion, the fluid in the fluid discharged to the lower horizontal pipe is removed. The aeration rate is significantly reduced, which reduces the amount of air guided to the storage chamber through the lower horizontal pipe, and can increase the amount of liquid stored in the storage chamber.

When a fluid flows inside the lower horizontal pipe, an L-shaped pipe bent downward from the vertical in the axial direction of the lower horizontal pipe is provided below the constricted portion. The fluid that has passed through the throttle-shaped portion from the space can be smoothly discharged along the flow of the fluid inside the lower horizontal pipe.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention. A swirling flow tube 6 shown in FIGS. 1 and 2 has a liquid collecting tube 1 connected to an upper end via an inflow portion 1a. The turning guide plate 3 is provided inside the pipe 2 extending vertically downward, and the turning guide plate 3 is formed integrally with a center pipe 7 provided at the center.

Inside the lower end of the swirling flow tube 6, a swirling guide plate 3 is provided.
The space portion 8 having a predetermined length and having no space is formed.

Further, at the lower end of the space portion 8 of the swirling flow tube 6, a throttle-shaped portion 9 having an internal cross-sectional area smaller than that of the swirling flow tube 6 is formed. Aperture part 9
Is 0.5D to 0.5D with respect to the inner diameter D of the swirling flow tube 6.
The size is about 8D.

The lower horizontal pipe 5 extending in the horizontal direction is connected to the lower end of the aperture-shaped portion 9. The inner diameter of the lower horizontal pipe 5 is equal to or larger than the inner diameter D of the swirling flow pipe 6.

The throttle-shaped portion 9 may be formed by a step portion 9a formed at the lower end of the swirling flow tube 6 and a small-diameter short tube 9b as shown in FIGS. 1 and 2, or as shown in FIG. like,
A funnel-shaped portion 10 may be formed at the lower end of the swirling flow tube 6 and a small-diameter short tube 9b may be connected to the lower end thereof. Alternatively, as shown in FIG. It is also possible to adopt a shape provided with a conical section 11 whose diameter increases toward.

As shown in FIGS. 1 and 2, a turning resistance plate 12 is provided at an upper position in the space 8. As shown in FIG. 5, the turning resistance plate 12 has a frame material 12 a having a cross shape in a plane and fixed to the inner surface of the pipe 2. Further, the turning resistance plate 12 also supports the lower end of the center tube 7 by the intersection of the cross-shaped frame member 12a.

FIGS. 6 and 7 show another example of the turning resistance plate 12, in which a plurality of blades having a required width and length are provided on the inner peripheral surface of the tube 2 in the space portion 8. FIG. The turning resistance plate 12 is formed by providing the protrusion 12b in the radial direction.

As shown in FIG. 1, the center tube 7 has an opening 7a at the lower end in the space 8 and an inflow portion 1a at the upper end.
It is open at the top inside. In FIG. 1, the upper portion of the center tube 7 is supported by the inflow portion 1a via the frame 13.

As shown in FIGS. 8 and 9, when there is a flow of fluid S inside the lower horizontal pipe 5, the axial center of the lower horizontal pipe 5 is located vertically below the constricted portion 9. An L-shaped tube 14 is provided which is bent in the direction in which the fluid flows in the downward direction. A protection pier 15 is located upstream of the L-shaped tube 14.
Is provided.

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

In the swirling flow pipe 6 shown in FIGS. 1 and 2, when a fluid such as rainwater flows in from the upper end, the fluid is swirled by the swirling guide plate 3 provided inside the swirling flow pipe 6, and swirled. While the flow is held, it flows down inside the swirling flow tube 6 and is discharged from the lower end of the swirling guide plate 3 into the space 8 of the swirling flow tube 6.

The fluid discharged into the space 8 is temporarily stored in the space 8 and consumes swirling energy. At this time, the cross-shaped frame material 1 is
When the swirl resistance plate 12 is provided by the blade 2b or the inner surface of the tube 2 is provided with the swirl resistance plate 12 as shown in FIGS. 6 and 7, the swirl resistance plate 12 further reduces the swirl force of the fluid. Therefore, the swirling energy of the fluid discharged into the space 8 is more effectively consumed.

The fluid discharged into the space 8 raises the pressure in the swirling flow tube 6 because the flow path is narrowed by the throttle-shaped portion 9, thereby further consuming the swirling energy. Thus, the flow becomes uniform in the space 8, whereby the air mixed into the fluid is effectively separated. The separated air passes through the space between the swing guide plates 3 and is discharged to the upper portion. When the lower end of the center tube 7 is open to the space 8, the air separated in the space 8 is effectively discharged to the upper portion through the inside of the center tube 7.

The swirl is thus suppressed, and the fluid from which the air has been separated is slowly discharged to the lower horizontal pipe 5 while diffusing in the form of a skirt through the throttle-shaped portion 9.

Therefore, the fluid discharged to the lower horizontal pipe 5 does not collide with the inner wall with an impact force, so that the problem of the lower horizontal pipe 5 vibrating or generating vibration noise can be reduced, and the lower horizontal pipe 5 can be used. Problems that can be damaged can be prevented.

Further, as described above, the swirling of the fluid is suppressed by the space portion 8 and the swirl resistance plate 12, and the air in the fluid is effectively separated by the pressure loss by the throttle-shaped portion 9, so that the lower horizontal portion is formed. The air entrapment rate in the fluid discharged to the pipe 5 is reduced, so that the amount of air guided to the storage chamber via the lower horizontal pipe 5 decreases, and the amount of liquid stored in the storage chamber increases.

In the above, as shown in FIG. 3, when a funnel-shaped portion 10 is formed at the lower end of the swirling flow tube 6 and a small-diameter short tube 9b is connected to the lower end thereof, a step portion 9a is provided as shown in FIG. In such a case, there is a possibility that an impact force acts on the step 9a, but such a problem can be prevented. In addition, as shown in FIG. 4, if a small-diameter short pipe 9b is provided at the lower end thereof with a conical section 11 having a diameter increasing toward the lower horizontal pipe 5, discharge is performed from the throttle-shaped section 9 to the lower horizontal pipe. Fluid spreading can be guided.

As shown in FIGS. 8 and 9, when the fluid flow S is present inside the lower horizontal pipe 5, the lower part of the constricted portion 9 is vertically positioned in the axial direction of the lower horizontal pipe 5. The provision of the L-shaped tube 14 bent in the downward direction of the fluid allows the fluid that has passed through the throttle portion 9 from the space portion 8 to be smoothly discharged along the flow of the fluid inside the lower horizontal tube 5.

It should be noted that the present invention is not limited only to the above-described embodiment, and that the iris-shaped portion may have various shapes other than those shown in the drawings. That the swirl resistance plate may be bent or inclined so as to resist the swirl flow, that the upper structure of the swirl flow tube is not limited at all, It goes without saying that various changes can be made without departing from the scope of the invention.

[0038]

As described above, according to the discharge structure for a swirling flow tube of the present invention, the following excellent effects can be obtained.

Since the space portion without the swirl guide plate is formed at the lower end of the swirl flow tube, the fluid discharged into the space portion is temporarily retained in the space portion, so that the swirling energy can be effectively consumed. At this time, if a turning resistance plate is provided in the space, the turning force of the fluid is further weakened by the turning resistance plate, so that the turning energy of the fluid discharged into the space can be more effectively consumed. .

The fluid discharged into the space increases the pressure in the swirling flow pipe due to the narrowed flow path by the throttle-shaped portion, thereby further consuming the swirling energy and causing the fluid to flow in the space. Thus, the air mixed into the fluid is effectively separated. At this time, if the lower end of the center tube is open in the space, the separated air is effectively discharged to the upper portion through the inside of the center tube.

The fluid that has passed through the throttle-shaped portion is diffused in a skirt shape with respect to the lower horizontal pipe and gradually discharged, and the fluid may collide with the inner wall of the lower horizontal pipe with an impact force. Therefore, the problem that the lower horizontal pipe vibrates or generates vibration noise can be reduced, and the problem that the lower horizontal pipe is damaged can be prevented.

Further, since the swirling of the fluid is suppressed by the space portion and the swirl resistance plate, and the air in the fluid is effectively separated by the pressure loss by the throttle-shaped portion, the air in the fluid discharged to the lower horizontal pipe is removed. The aeration rate is significantly reduced, which reduces the air guided to the reservoir through the lower horizontal tube and may increase the amount of liquid stored in the reservoir.

When there is a flow of fluid inside the lower horizontal pipe, an L-shaped pipe bent downward from the vertical in the axial direction of the lower horizontal pipe is provided below the constricted portion. The fluid that has passed through the throttle-shaped portion from the space can be smoothly discharged along the flow of the fluid inside the lower horizontal pipe.

[Brief description of the drawings]

FIG. 1 is a cut-away front view showing an embodiment of the present invention.

FIG. 2 is a view as seen in the direction of arrow II in FIG.

FIG. 3 is a cut-away front view showing an example of the form of the aperture-shaped portion.

FIG. 4 is a cut-away front view showing another example of the shape of the aperture-shaped portion.

FIG. 5 is a view taken in the direction of arrows VV in FIG. 1;

FIG. 6 is a cut-away front view showing an example of the configuration of a turning resistance plate.

FIG. 7 is a view taken along the line VII-VII in FIG. 6;

FIG. 8 is a cut front view showing another embodiment of the present invention.

FIG. 9 is a view as viewed in the direction of arrows IX-IX in FIG. 8;

FIG. 10 is a cutaway front view showing an example of a conventional device.

FIG. 11 is a view as seen in the direction of the arrow XI in FIG. 10;

[Explanation of symbols]

 2 pipe 3 swirl guide plate 5 lower horizontal pipe 6 swirl flow pipe 7 center pipe 7a opening 8 space part 9 throttle shape part 12 swirl resistance plate 14 L-shaped pipe S flow

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2D063 BA16 BA20 CA25 3H025 CA03 CB11

Claims (4)

[Claims] 1. A swirling flow pipe discharge structure comprising a swirling guide plate provided inside a vertically extending pipe to guide a fluid flowing from an upper end to a lower horizontal pipe at a lower end thereof. A discharge structure for a swirling flow tube, wherein a space portion having no swirl guide plate is formed inside the lower end of the flow tube, and the lower end of the swirling flow tube is connected to a lower horizontal tube via a throttle-shaped portion. 2. The discharge structure of a swirl flow tube according to claim 1, wherein a swirl resistance plate that resists the swirl flow is provided in the space. 3. The discharge structure for a swirling flow tube according to claim 1, wherein a center tube is provided on the swirling guide plate, and a lower end of the center tube is opened to a space. 4. The swirling flow tube according to claim 1, wherein an L-shaped tube bent from a vertical direction in the axial direction of the lower horizontal tube is provided below the throttle-shaped portion. Discharge structure.