JPS6326046B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention aims to obtain an effective pressing force without making the pipe diameter smaller than the main pipe inner diameter when transporting liquids or solids using fluid pressure. The present invention relates to a method and device for transporting solids using fluid. Sand pumps and jet pumps are conventionally known devices for transporting liquids or solids using fluid (air or water) pressure, but sand pumps transport solids relatively easily compared to the transport pipe diameter. limited to small particles. Further, since jet pumps normally accelerate by squeezing a portion of the transport pipe, they not only tend to become clogged with solids in the narrowed portion, but also tend to cause cavitation in the vicinity of the nozzle. Therefore, an invention was developed in which a part of the transport pipe was curved, a pressurized fluid injection nozzle was opened in the curved part, and an intake air port was provided near the nozzle end to prevent the cavitation phenomenon (Japanese Patent Publication No. 53-39699). ) has been proposed, but in this invention, a part of the transport pipe must be curved, and the high pressure fluid from the pressurized fluid injection nozzle is directed parallel to the center line of the transport pipe.
It must be discharged into the center of the fluid. Furthermore, a pneumatic transport device is known in which pressurized air is blown out from a slit provided around a transport pipe (Japanese Unexamined Patent Publication No. 120376/1983), but such a device simply blows pressurized air into a transport pipe at a predetermined angle. This is a technique for blowing air into air, and does not change the cross-sectional area of air flow. Therefore, even if there is an accelerating effect due to the blowing of pressurized air, it cannot be expected that the article transporting capacity will be enhanced due to the Ventury effect. However, in this invention, the pressurized fluid is blown in the transport direction from an annular slit provided at a suitable position in the tube and a plurality of nozzles provided immediately behind the annular slit, so that the diameter of the tube can be narrowed. It is now possible to easily transport even solid objects with a size not much different from the inner diameter of the tube without curving the tube, thus solving the problems of the conventional art.

That is, to explain this invention with reference to an embodiment, a main pipe 1 for transporting solid materials using fluid pressure is arranged along the vertical direction, and an annular casing 2, 2a and 2b are fitted and fixed. This installation interval varies depending on transportation conditions, but for example
Installed at 10m intervals. Each of the annular boxes 2, 2a, 2
b is the tapered pipe body 3, 3a, connected to the main pipe 1;
It is installed so as to cover an annular slit 5 which is provided so that the tip of the pipe 3b and the enlarged part 4 at the end of the main pipe 1 are opposed to each other. Further, a plurality of nozzle holes 11 are symmetrically provided at the end of the main pipe 1 immediately behind the annular slit 5 (at the top in the figure). The tip portions of the tapered tube bodies 3, 3a, 3b are curved inward to form a curved portion 6. In this case, the curved part 6
The inner diameter d of the main pipe 1 is approximately equal to the inner diameter opening of the main pipe 1. In the figure, 7, 7a, and 7b are air pipes, and 10 is a compressor. The main pipe connected to the tapered pipe is also reversely tapered for a certain distance. In the above, the air supply pipes 7, 7 are connected to the compressor 10.
When pressurized air is introduced into the annular housings 2, 2a through the annular slit 5, the pressurized air is blown into the main pipe through the annular slit 5. Therefore, the fluid (for example, water) in the main pipe is compressed as shown by arrows 8 and 8 in Fig. 2, and the cross-sectional area is reduced by curving like the constricted part of a ventilly pipe, and the fluid is accelerated. A suction force is generated to pull the solid object in the direction of arrow 9, that is, upward. Further, pressurized air is similarly injected from the nozzle hole 11, and this pressurized air is blown into the outer periphery of the pressurized air blown from the annular slit 5, thereby preventing the formation of a vortex in this space. When a fluid is made to flow along a long transport pipe, the transferred energy is gradually reduced due to the friction of the pipe wall. It can also be transported efficiently.

Although the above description has been made regarding the case of transporting solid objects using fluid, it can also be used to transport liquids such as oil. The fluid used in this invention is not limited to water or air, and it goes without saying that it can be effectively used between water and water, between water and air, or between air and air. However, in the case of water and air (the air is on the blowing side), the air blown between the inner wall of the main pipe and the water forms an air layer, so the frictional force of the water is drastically reduced. , This makes it possible to reduce the rate of reduction in transport energy. Normally, the velocity curve of the fluid in the cross section inside the tube is bullet-shaped, but if an air layer is created by blowing air to reduce friction, the velocity difference between the center and the tube wall side becomes smaller, and the solid Transport conditions can be made stable and smooth. In addition, when a nozzle is provided, buoyancy can be applied evenly to the solid material by arranging a plurality of nozzles symmetrically. The opening angle (α in Figure 2) of the tapered tube in this invention is within a practical range of 5 degrees to 10 degrees, but if it is less than 5 degrees, a long tube length is required to obtain the specified inner diameter, and if it is 10 degrees or more If this happens, the flow state of the fluid will become unstable, so preferably 7 degrees or 8 degrees
It is a degree. Next, the pressure difference between the pressure of the fluid flowing in the main pipe and the fluid being blown in varies somewhat depending on the properties of the fluid, but
It is preferable to set it as high as %. The amount of blown fluid also varies depending on the thrust required, but it is most commonly around 10% of the fluid in the main pipe. Further, the blowing angle of the fluid blown from the annular slit (angle with the center line of the main pipe) is approximately 20 to 30 degrees. In this invention, the diameter of the constricted part created by the fluid flowing in the main pipe from the side wall is determined by the diameter of the curved part of the tapered pipe, the flow rate of the fluid, the nature of the blown fluid, the pressure difference between both fluids, Although it varies depending on the amount of blowing, an example is as follows. The inner diameter of the main pipe is 10 cm, the maximum inner diameter of the tapered pipe is 12 cm, the flow rate of water in the main pipe is 5 m/sec,
When the pressure is 10Kg/cm ² , 13Kg/cm ² of air is 240L/
When the water was blown at a minimum slit angle of 30 degrees, the diameter of the water squeezed portion was 8 cm and the flow rate was 7.8 m/sec.

In the above, since the curved part formed by the tapered pipe end is provided just before the annular slit, the flow direction of the fluid can be smoothly changed, and then the blown fluid can draw a smooth streamline to form a narrowed part. be. That is, according to the present invention, pressurized fluid is blown into the pipe through an annular slit and a plurality of nozzle holes provided in the side wall of the transport pipe to form a constricted portion, thereby accelerating the fluid and preventing the movement of the fluid or the movement of the fluid and solids. It is possible to apply the necessary thrust to the main pipe, and it is also possible to easily move solid objects whose diameter is slightly smaller than the inner diameter of the main pipe. However, since the narrowed portion is formed of fluid, there is no risk of it becoming clogged with solid matter or being excessively abraded due to the passage of solid matter.

Next, if the fluid that carries the solids is a liquid and the blowing fluid is air, an air layer is created on the inner wall of the main pipe, which has the effect of significantly reducing the abrasion of the liquid. Therefore, the flow velocity curve of the liquid in the cross section of the main pipe is equalized, improving transport efficiency, and even when the solid is large, the thrust is applied equally to each part of the solid, so that the solid can be transported relatively smoothly. Further, since an annular slit having a predetermined blowing angle is provided on the side wall of the tube body, the blowing fluid flows evenly along the inner wall of the main tube, thereby forming a constricted portion having a circular cross section.

Further, even if the diameter is reduced by providing an inwardly curved portion at the tapered end of the pipe at the front of the annular slit, the inner diameter can be made equal to the inner diameter of the main pipe. In addition, multiple nozzle holes are provided immediately behind the annular slit, and pressurized fluid is similarly blown from these nozzle holes, thereby preventing the generation of eddy currents caused by pressurized fluid being blown from the annular slit. Therefore, it is possible to effectively increase the speed of the fluid. Furthermore, since the taper angle of the tapered tube body is set to 5 degrees to 10 degrees, there is an effect that the fluid flow state can be maintained smoothly. Furthermore, when this invention is used to transport liquids such as oil, it is possible to transport them efficiently without the need to apply enormous pressure using a large pump.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted front view of an embodiment of the present invention, and FIG. 2 is a partially enlarged sectional view. 1... Main pipe, 2, 2a, 2b... Annular box,
3, 3a, 3b... Tapered tube body, 5... Annular slit.

Claims (1)

[Claims] 1. A method for transporting a liquid or a solid substance by flowing a fluid into a tube, comprising: an annular slit at a suitable position in the tube; and a plurality of nozzles located immediately behind the annular slit. In front of this blowing section, the flow cross section of the fluid is successively increased, and immediately before the blowing section, it is reduced to the cross section of the tube body, and further, the annular slit of the blowing section and the nozzle are A transportation method using a fluid, characterized in that pressurized fluid is blown in the direction of transportation to reduce the flow cross section of the fluid. 2. A transportation method using a fluid according to claim 1, wherein the fluid flowing inside the tube is water and the pressurized fluid blown is air. 3. A transportation method using a fluid according to claim 1, wherein the pressurized fluid blowing portions are provided at a constant distance in the longitudinal direction of the tube. 4. A fluid blowing part is provided at a suitable position in the pipe body to blow pressurized fluid in the flow direction of the fluid in the pipe body to reduce the flow cross section of the fluid in the pipe body, and this blowing part has an annular slit and an annular slit. The pipe on the upstream side of the annular slit has a tapered pipe diameter of 5 degrees to 10 degrees, the diameter of which increases as it approaches the slit. A transportation device using a fluid characterized by narrowing the slit inward to the diameter of the transportation main pipe immediately in front of the slit. 5. The fluid transport device according to claim 4, wherein the fluid blowing portions are provided at predetermined intervals in the transport main pipe. 6. The fluid transport device according to claim 4, wherein the annular slit and the nozzle are inclined at an acute angle with respect to the center line of the tube.