JPH0634637Y2 - Submersible pump with stirring flow control ring - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a submersible pump for effectively sucking or excavating water bottom or sea bottom sediment.

[Conventional technology]

Conventionally, various forms of submersible pumps have been known as submersible pumps used for the above purpose.
There is a form shown in the figure.

In the figure, reference numeral 1 denotes an impeller casing surrounding the impeller 2, and the casing 1 has a bottom plate center portion opened to serve as a sediment suction port 3. Reference numeral 4 denotes a cylindrical strainer continuously provided in a lower portion of the impeller casing 1, and the cylindrical strainer 4 is connected to a lower portion of the tubular portion 5 and a tubular portion 5 whose upper end is coupled to the lower portion of the impeller casing 1. The bottom plate 6 is provided with a central opening 7. Also,
Reference numeral 8 is an output shaft of a rotary motor (not shown).
Extends under the bottom plate 6 through the earth and sand suction port 3 of the impeller casing 1 and the central opening 7 of the cylindrical strainer 4, and a stirring cutter 9 is fixed to the extended end thereof. Incidentally, 10 is a supporting leg for supporting the pump.

With this configuration, when the rotary motor is operated, the output shaft 8, the impeller 2, and the stirring cutter 9 rotate integrally, stirring the earth and sand located below the stirring cutter 9, and the stirring flow V ₁ is indicated by an arrow. As described above, it can be sucked into the impeller casing 1 through the through holes H ₁ and H ₂ provided in the cylindrical portion 5 and / or the bottom plate 6 of the cylindrical strainer 4, and then discharged to the outside using an appropriate earth and sand discharge pipe. be able to.

(C) Problems to be solved by the device However, in such a submersible pump, a considerable portion of the agitated flow V ₁ is not in the agitated flow and diffuses in all directions, resulting in a satisfactory suction efficiency. Couldn't get

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

(D) Means for Solving the Problems The present invention is directed to a rotary motor built in a 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. And an output shaft of the rotary motor extending downward through a central opening provided in the bottom plate of the impeller casing and the cylindrical strainer, and an impeller and a stirring cutter fixed to the output shaft in the impeller casing and the bottom plate, respectively. In the submersible pump provided, at least a through hole is provided in the bottom plate of the tubular casing, and an umbrella-shaped agitation flow control ring extending downward while gradually increasing in diameter is provided on the lower outer peripheral edge of the tubular strainer. The present invention relates to a submersible pump having an upper edge connected.

(E) Embodiment Hereinafter, the present invention will be described in detail based on an embodiment shown in the accompanying drawings.

FIG. 1 shows the entire structure of the submersible pump according to the present invention. A is a pump casing having a rotary motor B therein, and C is a pump portion connected to the lower portion of the pump casing A.

Further, FIG. 2 shows the internal structure of the pump portion C of the submersible pump according to one embodiment of the present invention.

As is apparent from the illustrated configuration, the submersible pump according to the present invention has a basic configuration substantially similar to that of the conventional pump described above. In this embodiment, the same configuration as the conventional pump is used. As a general rule, the members are
10 is added and shown.

Next, the structure that characterizes the present invention will be described with reference to FIGS. 2 to 4.

That is, as shown in FIG. 2, the cylindrical strainer 14 connects the upper edge of the stirring flow control ring 30 to the lower outer peripheral edge of the cylindrical strainer 14.

As a connecting method, in addition to welding, it is also possible to connect using bolts and nuts made of a non-rusting metal.

Further, as shown in FIG. 3, the bottom surface of the stirring flow control ring 30 may be cut out in a sawtooth shape in order to smooth the inflow of the water flow.

In addition, the stirring flow control ring 30 is, as shown in FIG.
The umbrella-shaped body has a diameter increasing toward the lower end.

Further, the length of the stirring flow control ring 30 is also preferably about half of the distance from the bottom plate 16 to the pump installation surface, but this is also the concentration of earth and sand, the size of the bottom plate 16, the size of the stirring cutter 19, etc. It can be set to an arbitrary length.

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

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

That is, most of the agitated flow V does not diffuse in the radial direction, but passes through the through holes 21 provided in the bottom plate 16 and the impeller casing.
Inflow into 11.

Further, a part of the agitated flow V tries to flow out and diffuse in the radial direction as shown by a dotted line without passing through the above-mentioned path, but the presence of the umbrella-shaped agitated flow control ring 30 according to the present invention causes a smooth upward flow. While drawing a curve, it is forced to flow into the impeller casing 11 through the through hole 21 of the bottom plate 16 as well.

In this way, the umbrella-shaped stirring flow control link 30 allows almost all of the stirred earth and sand to flow into the impeller casing 11 through the through holes 21 provided in the bottom plate 16, thereby improving suction efficiency.

4 and 5 show another embodiment, in addition to the umbrella-shaped agitation flow control ring 30, a bottom plate 16 is further provided.
It is characterized in that the outer peripheral edge is inclined toward the central opening 17.

With such a configuration, it is possible to further increase the suction efficiency of the sand according to the concentration of the sand.

That is, FIG. 4 shows a bottom plate structure capable of efficiently sucking high-concentration earth and sand, and FIG. 5 shows a bottom plate structure for efficiently sucking low-concentration earth and sand.

Further, in FIG. 5, the diameter of the central opening 17 of the bottom plate 16 is
It is possible to select an arbitrary value between the root diameter and the tip diameter of the stirring blade 19b provided around the base 19a of the stirring cutter 19, and by such selection, the central opening 17 has an annular communication with a sufficient opening area. The flow path can be formed, and the occurrence of cavitation at the same place can be effectively prevented.

However, the shape of the central opening 17 is not limited to that shown in FIG. 5, and as shown in FIG. 4, it may be slightly larger than the diameter of the output shaft 18.

Further, the tubular portion 15 of the tubular strainer 14 may be perforated by providing a through hole 22 as shown in FIG. 4 instead of being non-perforated as shown in FIG.

In this case, the through hole 22 provided in the tubular portion 15 can be used as an opening for adjusting the concentration.

That is, water can be further added to the sediment flow flowing into the impeller casing 11 through the through holes 22 to dilute the concentration of the sediment flow to the extent that the rotary motor is not overloaded.

FIG. 6 shows another embodiment, which is a case where the cylindrical strainer 14 has an arcuate cross section, and the umbrella-shaped stirring flow control ring 30 has a cylindrical shape. The strainer 14 is mounted on both sides of the substantially horizontal bottom.

Further, another embodiment is shown in FIG. 7, in which the downward extension of the agitation flow control ring 30 is not uniform over the entire circumference, and the agitator has one side like a cap eaves. It is characterized in that only the length is extended, and the length is gradually shortened toward the side facing 180 degrees.

With such a configuration, even if the water bottom or the sea bottom where the submersible pump is installed is slightly inclined, the submersible pump can be inclined according to the inclination angle to effectively perform suction work of earth and sand or the like.

As shown in FIG. 7, the umbrella-shaped agitation flow control ring 30 does not necessarily have to be provided over the entire circumference of the cylindrical strainer 14, and may be attached only to a part of the peripheral edge of the cylindrical strainer 14. it can.

In the embodiment described above, the impeller casing 11 may have another shape such as a volute type, and a strainer or the like may be attached to the lower portion.
Further, the design elements such as the shape of the stirring cutter 19 and the blade pitch can be arbitrarily changed, and the model having the optimum pumping characteristic for the processing target can be selected.

[Effect of device]

 According to the present invention, the following effects can be obtained.

That is, in the present invention, it is possible to suck the earth and sand stirred by the agitating cutter just below the bottom plate of the cylindrical strainer through the through hole of the bottom plate → the inside of the cylindrical strainer → the inside of the impeller casing. A part of the flow tries to diffuse in the outer radial direction of the stirring cutter, but since the stirring flow control ring is extended downward from the vicinity of the outer peripheral edge of the bottom plate, the stirring flow control ring is formed. A rising swirl flow that raises the sediment flow can be formed along the inner peripheral surface of the, and the sediment is reliably collected by the ring, and is sucked into the impeller casing through the through hole of the bottom plate as described above. As a result, substantially the entire amount of the stirred earth and sand can be effectively sucked and flowed into the impeller casing.

Moreover, since the diameter of the impeller casing and the diameter of the cylindrical strainer are formed to be substantially the same, it is possible to secure a large inflow amount of the earth and sand which flows through the through hole provided in the bottom plate of the cylindrical strainer. It is possible to ensure the formation of an upward swirling flow of sediment flow by the stirring flow control ring in which the upper edge is connected to the lower outer peripheral edge of the cylindrical strainer, and thus the stirring flow control ring formed to have an appropriate diameter. Thus, it is possible to remarkably improve the suction efficiency of the earth and sand sucked through the through hole of the bottom plate-> the inside of the cylindrical strainer-> the inside of the impeller casing.

[Brief description of drawings]

1 to 7 are structural explanatory views of a submersible pump according to the present invention, and FIG. 8 is a structural explanatory view 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: Agitation cutter 20: Support legs 21, 22: Through hole 30: Link for stirring flow control

Claims (1)

[Scope of utility model registration request] 1. A cylinder with a rotary motor B built in a pump casing A, an impeller casing (11) connected to a lower portion of the casing A, and a bottom plate (16) connected to a lower end of the impeller casing (11). -Shaped strainer (14), the output shaft (18) of the rotary motor that extends downward through a central opening (17) provided in the bottom plate (16) of the impeller casing (11) and the cylindrical strainer (14), and the same output An impeller (12) and a stirring cutter (19) fixed to the shaft (18) inside the impeller casing (11) and below the bottom plate (16), respectively.
In a submersible pump including: a diameter of an impeller casing (11) and a cylindrical strainer (1
The diameters of 4) are formed to be approximately the same, and the same cylindrical strainer (1
A through hole (21) is provided in the bottom plate (16) of 4), and the bottom plate (16) extends to the lower outer peripheral edge of the cylindrical strainer located near the outer peripheral edge while gradually increasing the diameter downward. A submersible pump having a stirring flow control ring, characterized in that the upper edge of a cylindrical stirring flow control ring (30) is connected.