JP2000038763A - Vortex type fall work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vortex type fall-forming work capable of restraining the ingress of air with a simple constitution, stabilizing the outflow of water from an outlet, and enhancing design freedom for fall, flowrate or the like. SOLUTION: A tapered part 10 having an aperture gradually reduced downward is formed on the lower part of a vortex chamber 9 and a vortex facilitating part 8 having a collecting pipe 11 connected tangentially to the vortex chamber 9 is provided at the upper part. In addition, the lower part of the tapered part 10 of the vortex facilitating part 8 is fitted with a straight tube 7 having an outflow pipe 4 at the lower end, and a resistance means 15 is laid in the straight tube 7, thereby forming a stabilized vortex 6 and causing the disappearance of the vortex 6 in the straight tube 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swirl type head and, more particularly, to a structure having a simple structure to suppress the inflow of air and stabilize the outflow of water from an outlet. In addition, the present invention relates to an eddy-current-type head work capable of increasing the degree of freedom in design with respect to a head, a flow rate, and the like.

[0002]

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

[0003] In the above-mentioned inundation countermeasure facility, a 100-meter pipe is provided between a collecting pipe for collecting rainwater and a storage pipe provided deep underground.
Pipe line equipment that connects a high head of up to 200 m is called a head work, and as the head work, a vortex-type head work as shown in FIGS. 7 and 8 is being studied.

FIG. 7 and FIG. 8 show an example of a vortex-type head, in which a water collecting pipe 2 for sending water 1 such as rainwater separated by a water dividing facility (not shown) is tangentially connected to the upper end. A vertical tubular drop shaft 3 is provided, and a horizontally bent outflow pipe 4 is formed at the lower end of the drop shaft 3 to constitute a vortex-type head 5. The outflow pipe 4 is provided underground (not shown). Connected to a storage section such as a storage pipe.

[0005] In the vortex-type head 5, when water 1 such as rainwater separated by a diversion facility (not shown) is supplied from the tangential direction to the upper end of the drop shaft 3 through the water collecting pipe 2, A swirling flow 6 is formed inside 3,
The swirling flow 6 goes downward while gradually attenuating, flows out of the outflow pipe 4, is sent to a storage unit (not shown), and is stored therein.

As described above, when the water 1 is turned into the swirling flow 6 to flow down the drop shaft 3, the falling energy of the water 1 can be reduced, and the drop landing portion at the lower end of the drop shaft 3 has an impact or the like. A large amount of water 1 can flow smoothly in a short period of time without causing vibration or damage.

[0007] Also, the eddy current head 5 shown in FIGS.
In addition to the above, a spiral plate-type head construction that forcibly forms a swirling flow inside the drop shaft by providing a spiral plate inside the drop shaft is also considered. May cause a problem that dust contained in rainwater or the like is caught or adhered to the upper end portion or the mounting corner portion of the spiral plate, but the vortex-type head 5 has a simple internal structure, There is an advantage that a problem such as a spiral plate type drop construction does not occur.

[0008]

However, the conventional vortex-type head 5 has a simple structure as shown in FIGS. 7 and 8, but has a design freedom with respect to the head, flow rate and the like. There was a problem that the degree was small.

That is, in order to attenuate the falling energy of the water 1 in the swirl type head 5, the drop shaft 3
It is necessary to form a stable swirl flow 6 over the entire inside of the drop shaft 3. On the other hand, if the swirl flow 6 also exists at the lower end of the drop shaft 3, the swirl flow 6 acts on the outflow pipe 4 as an impact flow. Impulsive sounds and vibrations are caused, and a problem in strength is caused. In addition, a problem that an air mixing ratio in the water 1 flowing to the outflow pipe 4 is increased is caused. It is necessary to eliminate the swirling flow 6.

Generally, the outflow pipe 4 in the swirl type head 5
In order to cope with the problem that the air mixing ratio into the storage unit is large and the amount of water stored in the storage unit is reduced, the outflow pipe 4 or the piping unit or the like for air removal is installed in the storage unit to reduce the air mixed therein. With the problem that the equipment cost for air release increases,
There is a problem that an unpleasant odor may be generated at a portion where the extracted air is opened to the ground.

As described above, in the eddy current type head 5,
The condition that a stable swirling flow 6 is formed inside the drop shaft 3 and the condition that the swirling flow 6 is quickly eliminated at the lower end of the drop shaft 3 are required at the same time.
The position where the swirling flow 6 disappears in the drop shaft 3 greatly changes depending on the head (the length of the eddy-type head 5), the flow rate (rainfall), and the like. Therefore, a design corresponding to the head is assumed. It is necessary to design for each rainfall, and there is a problem that design freedom is low (small).

In view of the above-mentioned circumstances, the present invention can suppress the incorporation of air with a simple configuration, stabilize the outflow of water from the outlet, and design freely with respect to the head and flow rate. It is an object of the present invention to provide a swirl type head that can increase the degree.

[0013]

According to the present invention, there is provided a swirl flow accelerating portion having a tapered portion having a diameter gradually reduced downwardly formed at a lower portion of the swirl flow chamber and connected to a water collecting pipe in a tangential direction of the swirl flow chamber. A vortex-type head, comprising: a straight pipe portion having an outlet pipe connected to a lower end thereof at a lower portion below the tapered portion of the vortex flow promoting portion, and a resistance means provided in the straight pipe portion. It is related.

Further, an air outlet may be provided at the axial center of the swirl chamber.

The resistance means may be a projection projecting from the inner surface of the straight pipe portion to increase the pressure loss by increasing the frictional resistance of the swirling flow, or may reduce the flow path cross-sectional area of the straight pipe portion. It may be an orifice of a required stage in which the pressure loss is increased by increasing the pressure loss, and furthermore, it may be provided with an enlarged diameter portion having an increased diameter below the straight pipe portion.

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

Since the water collecting pipe is connected to the vortex chamber having a large diameter from the tangential direction, and further provided with a vortex promoting part having a tapered part whose diameter gradually decreases toward the straight pipe part below the vortex chamber. , The water introduced into the vortex chamber from the collecting pipe,
By increasing the turning force when flowing down the tapered portion, the fall energy can be effectively attenuated.

Due to the increase of the turning force, the air in the water is
Since the taper portion and the central portion of the vortex chamber are effectively gathered and separated from each other, the aeration rate of water guided to the outflow pipe can be significantly reduced.

Since the resistance means is provided in the straight pipe part, the swirling flow which has entered the straight pipe part is rapidly attenuated by the resistance means, and the falling energy can be effectively attenuated.

Since the pressure loss is increased by the resistance means, the air mixed in the water is forced to be pushed toward the center of the upper tapered portion where the pressure is reduced, thereby further separating the air. Will be performed reliably. In this way, the air is effectively separated inside the swirl chamber, so that the equipment for air release conventionally provided in the outflow pipe or the storage unit can be reduced in size,
Alternatively, the installation can be omitted altogether.

As described above, in the vortex-type head, a stable and strong swirling flow is formed by the tapered portion of the vortex-promoting portion to effectively attenuate the falling energy, and thereafter, the resistance means provided in the straight pipe portion is used. Since the swirling flow is rapidly eliminated, the swirl flow can be formed and eliminated irrespective of the head and flow rate of the swirl type head, and the design freedom of the swirl type head Can be greatly increased.

When the resistance means is constituted by a projection,
The swirling energy can be attenuated by the frictional resistance of the projection, and if the resistance means is constituted by an orifice, the swirling energy can be attenuated by the throttle effect of the opening while the swirling flow is stably formed at the upper part of the orifice. In addition, when the enlarged diameter portion is formed below the straight pipe portion, the pressure is released at the enlarged diameter portion, so that the swirling flow can be more reliably eliminated.

[0023]

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

FIGS. 1 to 3 show an embodiment of the present invention. As shown in FIGS. 1 to 3, a straight pipe portion 7 having a lower end connected to an outflow pipe 4 bent in a horizontal direction. A vortex promoting part 8 is formed on the upper part of the whirlpool.

The swirl flow promoting section 8 is formed with a swirl chamber 9 having a larger diameter than the straight pipe section 7, and is formed at a lower portion of the swirl chamber 9 so that the diameter thereof is gradually reduced downward, and a lower end thereof is formed at the straight pipe section 7. And a water collecting pipe 11 tangentially connected to the vortex chamber 9 so as to form a high-speed swirling flow 6 therein. The water collecting pipe 11 is formed from a circular pipe 11A for sending water 1 such as rainwater separated by a water dividing facility (not shown) or the like to a vertically long rectangular pipe 11.
B, and the square tube 11 </ b> B is tangentially connected to the vortex chamber 9.

Further, an air outlet 13 for opening the inside of the swirl chamber 9 to the outside is provided at an axial center position of the swirl chamber 9 in the upper plate 12 of the swirl chamber 9. The air outlet 13 may be provided with an air outlet pipe 13A that has entered the inside of the swirl chamber 9 as shown by a two-dot chain line.

Inside the straight pipe portion 7, the frictional resistance of the swirling flow 6 which protrudes from the inner surface of the straight pipe portion 7 to increase the pressure loss,
In addition, a vortex-type head 16 is provided with a resistance means 15 including a plurality of protrusions 14 that are long in the vertical direction so as to eliminate the swirling flow 6. The projection 14 can be formed by fixing a narrow plate or bar to the inner surface of the straight pipe portion 7 by welding.

FIGS. 4 and 5 show another example of the resistance means 15. In FIGS. 4 and 5, the cross-sectional area of the flow passage is reduced by an opening 17 having a diameter smaller than the diameter of the straight pipe portion 7. FIG. An orifice 18 is provided to increase the pressure loss by squeezing and to eliminate the swirling flow 6. In FIG. 4, one orifice 18 is provided, but two or more orifices may be provided.

Further, the resistance means 15 by the projection 14 in FIGS. 2 and 3 and the resistance means 15 by the orifice 18 in FIGS. 4 and 5 may be provided in combination.

FIG. 6 shows that the enlarged diameter portion 19 whose diameter is gradually increased with respect to the straight pipe portion 7 is formed below the straight pipe portion 7 so that the swirling flow 6 can be eliminated by the enlarged diameter portion 19. It shows the case where it is done. Also in this case, the straight pipe portion 7
Resistance means 15 by orifice 18 and resistance means 1 by orifice 18
5 may be provided, or both may be provided in combination.

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

The basic operation of the swirl type head 16 is the same as that shown in FIGS.

In the embodiment shown in FIGS. 1 to 6, the water collecting pipe 11 is connected to the vortex chamber 9 having a large diameter from the tangential direction, and the lower part of the vortex chamber 9 faces the straight pipe portion 7. Since the eddy current promoting portion 8 is formed by forming the tapered portion 10 whose diameter gradually decreases, the water 1 introduced into the vortex chamber 9 from the water collecting pipe 11 has a swirling force when flowing down the tapered portion 10. The fall energy is effectively attenuated.

Further, due to the increase of the swirling force, the air in the water 1 is gathered so as to form an air column 20 at the center of the tapered portion 10 as shown in FIG. Since the water flows out from the outside 13, the air mixing ratio of the water 1 guided to the straight pipe portion 7 can be significantly reduced.

The swirling flow 6 whose swirling force has been increased by the tapered portion 10 is directly guided to the straight pipe portion 7, but as shown in FIGS. Since the resistance means 15 consisting of 14 is provided, the swirling flow 6 having entered the straight pipe portion 7 is rapidly attenuated by the frictional resistance of the projection 14, whereby the falling energy is effectively attenuated and at the same time the pressure is reduced. Losses are increased.

As the pressure loss is increased by the resistance means 15, the air mixed in the water 1 is pushed to the center side of the upper tapered portion 10 where the pressure is low, and this is actuated. This ensures further air separation.

As described above, since the air is effectively separated and removed in the vortex flow promoting section 8, the air venting equipment conventionally provided in the outflow pipe 4 and the storage section can be reduced in size, Alternatively, the installation can be omitted altogether.

On the other hand, the orifice 18 shown in FIGS.
When the straight pipe part 7 is provided with the resistance means 15 by
In the upper part of the orifice 18, the swirling flow 6 continues to be formed stably.
The swirling flow is rapidly attenuated, so that the fall energy is effectively attenuated, and the pressure loss is increased at the same time. As the pressure loss is increased by the resistance means 15 including the orifice 18, the air mixed in the water 1 is forced to move toward the center of the upper tapered portion 10 where the pressure is low, and This enhances the air separation effect.

As shown in FIG. 6, when the enlarged diameter portion 19 whose diameter is gradually increased is formed below the straight pipe portion 7, the pressure of the water 1 is released at the enlarged diameter portion 19. As a result, the swirling flow 6 is more reliably attenuated. In this case, if the straight pipe portion 7 is provided with one or both of the resistance means 15 by the projection 14 and the resistance means 15 by the orifice 18, the air flow is further reduced. The separation effect and the fall energy damping effect can be enhanced.

It should be noted that the present invention is not limited to the above-described embodiment, and that the resistance means may have a shape other than that shown in the figures, and that the water collecting pipe is connected to the vortex chamber. May be a connection that is inclined other than the horizontal shown in the figure, and it is needless to say that various changes can be made without departing from the gist of the present invention.

[0041]

As described above, according to the eddy current head of the present invention, the water collecting pipe is connected to the eddy chamber having a large diameter from the tangential direction, and furthermore, the water pipe is provided at the lower part of the eddy chamber toward the straight pipe part. Since the whirlpool is provided with a vortex promoting part with a tapered part whose diameter gradually decreases, the water introduced from the water collecting pipe into the vortex chamber increases the turning force when flowing down the tapered part, thereby reducing the falling energy. There is an effect that can be attenuated effectively.

Further, since the underwater air effectively gathers and separates at the tapered portion and the central portion of the vortex chamber due to the increase of the swirling force, the aeration rate of the water guided to the outflow pipe is significantly reduced. There is an effect that can be.

Since the resistance means is provided in the straight pipe part, the swirling flow which has entered the straight pipe part is rapidly attenuated by the resistance means, and there is an effect that the fall energy can be effectively attenuated.

Further, the pressure loss is increased by the resistance means, so that the air mixed in the water is pushed to the center side of the upper tapered portion where the pressure is low, whereby the air is further reduced. Is reliably separated. As described above, since the air is effectively separated in the swirl chamber, it is possible to reduce the size of the air venting device conventionally provided in the outflow pipe or the storage unit, or to omit the installation. There is an effect that can be done.

As described above, in the swirl type head, a stable and powerful swirling flow is formed by the tapered portion of the swirl accelerating portion to effectively attenuate the falling energy, and thereafter, the resistance means provided in the straight pipe portion is used. Since the swirling flow is rapidly eliminated, the swirl flow can be formed and eliminated irrespective of the head and flow rate of the swirl type head, and the design freedom of the swirl type head There is an effect that can be greatly increased.

When the resistance means is constituted by a projection,
The swirling energy can be attenuated by the frictional resistance of the projection, and if the resistance means is constituted by an orifice, the swirling energy can be attenuated by the throttle effect of the opening while the swirling flow is stably formed at the upper part of the orifice. In addition, when the enlarged diameter portion is formed at the lower portion of the straight pipe portion, there is an effect that the swirling flow can be more reliably eliminated by releasing the pressure at the enlarged diameter portion.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and is a side view showing the inside in a see-through manner.

FIG. 2 is a plan view of FIG.

FIG. 3 is a view taken in the direction of arrows III-III in FIG. 1;

FIG. 4 shows another example of the embodiment of the present invention.
It is the side view which showed the inside through.

FIG. 5 is a view taken in the direction of arrows VV in FIG. 4;

FIG. 6 is a side view showing still another example of the embodiment of the present invention and showing the inside thereof in a see-through manner.

FIG. 7 is a side view showing an example of a conventional vortex-type head.

FIG. 8 is a plan view of FIG. 7;

[Explanation of symbols]

 Reference Signs List 4 Outflow pipe 6 Swirling flow 7 Straight pipe section 8 Eddy flow promoting section 9 Eddy flow chamber 10 Tapered section 11 Water collecting pipe 13 Air outlet 14 Protrusion 15 Resistance means 16 Eddy current head drop 18 Orifice 19 Enlarged diameter section

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Satoshi Kawasaki 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawajima-Harima Heavy Industries, Ltd. F-term (Reference) 2D063 AA01 CA25

Claims (5)

[Claims] 1. A swirl flow promoting part, wherein a lower part of the swirl flow chamber is formed with a tapered part whose diameter gradually decreases downward and a water collecting pipe is connected to a tangential direction of the swirl flow chamber at an upper part thereof. An eddy current head comprising a straight pipe part having a lower end to which an outflow pipe is connected, and a resistance means in the straight pipe part. 2. The vortex-type head drop according to claim 1, wherein an air outlet is provided at the center of the axis of the vortex chamber. 3. The vortex flow type as claimed in claim 1, wherein the resistance means is a projection projecting from the inner surface of the straight pipe portion so as to increase the pressure loss by increasing the frictional resistance of the swirling flow. Head work. 4. A vortex-type head drop according to claim 1, wherein the resistance means is a required-stage orifice in which the pressure loss is increased by reducing the flow path cross-sectional area of the straight pipe portion. . 5. The eddy current head according to claim 1, further comprising an enlarged diameter portion having an increased diameter below the straight pipe portion.