JPH0113832Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a submersible pump that effectively sucks or excavates the bottom of the water or seabed sediment.

[Conventional technology]

Various types of submersible pumps have been known as submersible pumps used for the above purpose, one of which is the type shown in FIG. 10.

In the figure, 1 is an impeller casing that surrounds an impeller 2, and the casing 1 has an opening at the center of its bottom plate to form a sand suction port 3. 4 is a cylindrical strainer connected to the lower part of the impeller casing 1, and the cylindrical strainer 4 has a cylindrical part 5 whose upper end is connected to the lower part of the impeller casing 1, and a cylindrical part 5 which is connected to the lower part of the cylindrical part 5. It consists of a bottom plate 6, and the bottom plate 6 is provided with a central opening 7. Also,
8 is an output shaft of a rotary motor (not shown), and the output shaft 8 extends below the bottom plate 6 through the sand suction port 3 of the impeller casing 1 and the central opening 7 of the cylindrical strainer 4. A stirring cutter 9 is fixed to the end. In addition, 10
are support legs for supporting the pump.

With this configuration, when the rotary motor is operated, the output shaft 8, impeller 2, and stirring cutter 9 rotate integrally, stirring the earth and sand located below the stirring cutter 9, and the earth and sand are indicated by arrows. As such, the soil can be sucked into the impeller casing 1 through the through holes 10 and 11 provided in the cylindrical portion 5 and/or the bottom plate 6 of the cylindrical strainer 4, and then discharged to the outside using a suitable soil discharge pipe. can.

(c) Problems to be solved by the invention However, in such a submersible pump, a considerable portion of the stirred soil does not go into the stirring flow, but is dispersed in all directions, and as a result, the suction efficiency is not satisfactory. I couldn't get it.

An object of the present invention is to provide a submersible pump that can solve these problems.

(d) Means for solving the problem The present invention consists of a rotary motor built into the pump casing, an impeller casing connected to the lower part of the casing, and a cylindrical strainer with a bottom plate connected to the lower end of the impeller casing. , an output shaft of a rotary motor extending downward through a central opening provided in the impeller casing and the bottom plate of the cylindrical strainer, and an impeller and a stirring cutter fixed to the output shaft in the impeller casing and at the bottom of the bottom plate, respectively. A submersible pump comprising: an upper edge of an agitation flow control ring whose outer edge extends in a radial direction, the upper edge of which is connected to at least the upper part of the cylindrical part of the cylindrical strainer; This relates to pumps.

(e) Examples The present invention will be explained in detail below based on examples shown in the attached drawings.

FIG. 1 shows the overall configuration of a submersible pump according to the present invention, where A is a pump casing that houses a rotary motor B therein, and C is a pump connected to the lower part of the pump casing B.

Further, FIG. 2 shows the internal structure of a pump section C of a submersible pump according to an embodiment of the present invention.

As is clear from the illustrated configuration, the basic configuration of the submersible pump according to the present invention is substantially the same as that of the conventional pump described above. Components are shown with the same reference numerals plus 10.

Next, the configuration that characterizes the present invention will be explained with reference to FIGS. 2 to 8.

That is, as shown in FIG.
4 connects the upper end edge of a stirring flow control ring 30 to the upper part of the cylindrical strainer 14, and the ring 30 forms a stirring flow inflow guide surface on its lower surface.

As for the connection method, in addition to welding, it is also possible to connect with bolts and nuts made of rust-free metal.

In addition, although the stirring flow control ring 30 is shown as an underwater annular flat plate body extending in the radial direction parallel to the bottom plate 16 of the cylindrical strainer 14 in FIG. It can take any form, for example, as shown in FIG. 3, it can be an umbrella-shaped body whose diameter increases toward the lower end.

Furthermore, the length and installation angle of the stirring flow control ring 30 can be adjusted to any length by taking into account the concentration of soil, the size of the bottom plate 16, the length of the cylindrical part 15, the size of the stirring cutter 19, etc. can do.

Next, the operation of the submersible pump having such a configuration will be explained.

When the stirring cutter 19 is rotated, a stirring flow V consisting of a mixture of earth and sand is formed as shown by the arrow in FIG. 2.

That is, most of the stirring flow V passes through the through hole 21 provided in the bottom plate 16 and the through hole provided in the cylindrical portion 15 to the impeller casing 1 without diffusing in the radial direction.
1.

In addition, a part of the stirring flow V does not pass through the above route,
It tries to diffuse upward as shown by the dotted line, but
Due to the presence of the stirring flow control ring 30 according to the present invention, the flow is forced to similarly flow into the impeller casing 11 through the through hole 22 of the cylindrical portion 15 .

In this way, the stirring flow control ring 30 allows almost the entire amount of the stirred earth and sand to flow into the impeller casing 11 through the through hole 21 provided in the bottom plate 16 and the through hole 22 provided in the cylindrical portion 15. Can improve efficiency.

4 and 5 show another embodiment, which is characterized in that, in addition to the stirring flow control ring 30, the bottom plate 16 is further inclined from its outer peripheral edge toward the central opening 17. shall be.

With this configuration, depending on the concentration of soil,
Earth and sand suction efficiency can be further increased.

That is, FIG. 4 shows a bottom plate structure that can efficiently suck up high-concentration earth and sand, and FIG. 5 shows a bottom plate structure that can efficiently suck up low-concentration earth and sand.

In addition, in FIG. 3, the central opening 1 of the bottom plate 16
The diameter of the central opening 7 is made much larger than the diameter of the output shaft 18 and approximately equal to the diameter of the stirring cutter 19, so that the central opening 17 can form an annular communication flow path with a sufficient opening area. , it is possible to effectively prevent cavitation from occurring at the same location.

However, the shape of the central opening 17 is not limited to that shown in FIG. 3, and may be slightly larger than the diameter of the output shaft 18, as shown in FIG. 1.

In this embodiment, the through hole 22 provided in the cylindrical portion 15 can also be used as an opening for concentration adjustment.

That is, by further adding water through the through hole 22 to the debris flow flowing into the impeller casing 11, the concentration of the debris flow can be diluted to an extent that the rotary motor is not overloaded.

Another embodiment is shown in FIG. 6, and this embodiment is characterized in that the outer diameter of the cylindrical strainer 14 is small and the stirring flow control ring 30 is arcuate.

In this case as well, the stirring flow and the concentration adjustment flow can be smoothly introduced into the impeller casing 11 by the stirring flow control ring 30.

Further, FIG. 7 shows a modification of the embodiment shown in FIG. 6, in which the stirring flow control ring 30
It is characterized in that it extends further downward than the lower surface of the cylindrical strainer 14.

Furthermore, FIG. 8 shows another embodiment, in which the downward extension length of the stirring flow control ring 30 is not made uniform over the entire circumference, but is shaped like the bill of a hat. It is characterized by stretching only on one side and gradually shortening the length toward the opposite side by 180 degrees.

With this configuration, even if the bottom of the water or the ocean floor on which the submersible pump is installed is somewhat inclined, the submersible pump can be tilted in accordance with the inclination angle to effectively perform suction work of earth and sand.

Note that, as shown in FIG. 8, the eave-shaped agitation flow control ring 30 does not necessarily need to be provided over the entire circumference above the cylindrical strainer 14, and may be provided only on a portion of its periphery.

Further, FIG. 9 shows a modification example of FIG. 8.

Note that the shape of the impeller casing 11 may be other than the volute type, and a strainer or the like may be attached to the lower part. Further, design elements such as the shape of the stirring cutter 19 and the pitch of the blades can be changed as desired, and a model with the optimum water pumping characteristics for the object to be treated can be selected.

[Effect of idea]

As described above, in the present invention, since a stirring flow control ring is provided at the top of the cylindrical strainer, it is possible to prevent part of the sediment flow from spreading in the radial direction. Almost all of the sediment flow can be sucked into the impeller casing through the through holes provided in the impeller casing, and the suction efficiency can be significantly improved.

[Brief explanation of the drawing]

1 to 9 are structural explanatory diagrams of a submersible pump according to the present invention, and FIG. 10 is a structural explanatory diagram of a conventional submersible pump. In the figure, 11: Impeller casing, 12: Impeller, 13: Sediment suction port, 14: Cylindrical strainer, 15: Cylindrical part, 16: Bottom plate, 17: Center opening, 18: Output shaft, 19: Stirring cutter, 21 ，
22: Through hole, 30: Stirring flow control ring.

Claims (1)

[Scope of claim for utility model registration] A rotating motor built into the pump casing,
The impeller casing 11 connected to the lower part of the casing, the cylindrical strainer 14 of the bottom plate 16 connected to the lower end of the impeller casing 11, and the central opening 17 provided in the bottom plate 16 of the impeller casing 11 and the cylindrical strainer 14 downwardly. an output shaft 18 of the rotary motor extending to the output shaft 18;
In a submersible pump that includes an impeller 12 and an agitation cutter 19 that are fixed inside the impeller casing 11 and at the bottom of the bottom plate 16, respectively, a through hole 22 is provided in the peripheral wall of the cylindrical strainer 14 for allowing the agitation flow to flow in, and the same is provided. A stirring flow characterized in that a stirring flow control ring 30 whose outer edge extends in the radial direction is disposed directly above the through hole 22, and the lower surface of the ring 30 is formed as a stirring flow inflow guide surface. Submersible pump with control ring.