JPH0442558Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Field of industrial application The present invention relates to a submersible pump that effectively sucks or excavates the bottom of the water or seabed sediment.

(b) Prior Art Various types of submersible pumps have been known as submersible pumps used for the above-mentioned purposes, one of which is the type shown in FIG.

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. Also, 10
is a support leg that supports the pump, and the support leg 10
A stirring flow forming space S is formed inside the cylindrical strainer 4 and below the cylindrical strainer 4 .

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 in the stirring flow forming space S, and , through holes 1 provided in the cylindrical part 5 and/or bottom plate 6 of the cylindrical strainer 4 as shown by arrows.
1 and 12 into the impeller casing 1, and then discharged to the ground etc. using a suitable earth and sand discharge pipe.

Further, in the above operation, the through hole provided in the cylindrical portion 5 is also used to introduce water for adjusting the soil concentration.

(c) Problems to be solved by the invention However, in such a submersible pump, since the opening area of the through hole 12 provided in the cylindrical part 5, which can also be used to adjust the sediment concentration, is constant, the concentration of the sediment flow is Even if the concentration changes, only a fixed amount of water can be supplied, so the concentration cannot be adjusted accurately.If the concentration is too high, the motor will be overloaded, and if the concentration is low, the suction efficiency will be affected. This caused a decrease in

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. , a support leg connected to the lower end of the cylindrical strainer, an agitation flow forming space formed in the support leg below the cylindrical strainer so as to be able to communicate with the outside, and a space provided on the impeller casing and the bottom plate of the cylindrical strainer. an output shaft of a rotary motor extending into the stirring flow forming space through the central opening;
In a submersible pump that has an impeller fixed to the output shaft in an impeller casing, the bottom plate is provided with a plurality of through holes that communicate the stirring flow forming space and the internal space of the cylindrical strainer, and the cylindrical strainer is A through hole for concentration adjustment is provided in the cylindrical part of the strainer, and a sleeve for controlling the water absorption position is attached to the cylindrical part and the support leg so as to be movable up and down along the outer circumferential surface, and the water absorption position of the through hole for concentration adjustment is fixed. The flow path changes vertically and flows from the stirring flow forming space into the inner space of the cylindrical strainer through the through hole, and the flow path flows out from the stirring flow forming space to the outside and flows into the cylindrical strainer through the through hole. selectable and none, and
This invention relates to a submersible pump equipped with a concentration adjustment mechanism characterized in that the outer diameter of the impeller casing is larger than the outer diameter of the cylindrical strainer.

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

Figure 1 shows the overall configuration of the submersible pump according to the present invention, where A is a pump casing with a built-in rotating motor B, and C is a pump casing A.
This is a pump section connected to the lower part of the pump.

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

As is clear from the illustrated embodiment, the basic configuration of the submersible pump according to the present invention is substantially the same as that of the conventional submersible pump, and in this embodiment, the submersible pump according to the present invention has the same basic structure as the conventional submersible pump. 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.

As shown in FIGS. 2 to 4, the cylindrical strainer 14 has a through hole 22 in its cylindrical portion 15, and a suction position control sleeve 30 around its outer periphery and support leg 20. It is installed so that it can be raised and lowered freely.

This sleeve 30 is a non-porous cylindrical body, and by moving up and down, it can open and close the through hole 22 at any position, and also communicates all or part of the stirring flow forming space with the outside. It is configured to be shieldable, and the density can be adjusted as described below.

First, when the soil concentration is high, the suction position control sleeve 30 is placed at a position overlapping the cylindrical portion 15 of the cylindrical strainer 14, as shown in FIG.
All of the through holes 22 provided in multiple stages are closed, and a sufficiently wide stirring flow forming space S is formed between the bottom plate 16 and the pump installation surface G.

Thereafter, when the stirring cutter 19 is rotated, a stirring flow V consisting of a mixture of earth and sand and water is formed as shown by the arrow in FIG. 2. At this time, water W for concentration adjustment is simultaneously mixed into the stirring flow V through the stirring flow forming space S, and the concentration of the stirring flow V can be diluted.

In addition, when the soil concentration is medium, the suction position control sleeve 30 is placed at a position partially overlapping the lower part of the cylindrical part 15 of the cylindrical strainer 14, as shown in FIG. The provided through hole 22 is opened, and a part of the stirring flow forming space S between the bottom plate 16 and the pump installation surface G is shielded.

Thereafter, when the stirring cutter 19 is rotated, a stirring flow V consisting of a mixture of earth and sand and water is formed as shown by the arrow in FIG. 3. At this time, water W for concentration adjustment is simultaneously mixed into the stirring flow V through the water absorption space S and the upper through hole 22, and the concentration of the stirring flow V can be diluted.

In addition, when the soil concentration is low, the suction position control sleeve 30 is inserted into the entire through hole 2 provided in the cylindrical portion 15 of the cylindrical strainer 14, as shown in FIG.
2 is opened, and the stirring flow forming space S provided between the bottom plate 16 and the pump installation surface G is completely shielded.

Thereafter, 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. 4. At this time, the cylindrical part 15
Water for concentration adjustment is mixed into the agitation flow V through the full through hole 22 provided in the agitation flow V, and the concentration of the agitation flow V can be diluted.

In this way, by using the suction position control sleeve 30, the rotary motor can be prevented from accidents such as burnout without reducing the suction efficiency of the submersible pump.

Furthermore, as shown in FIG. 2, in this embodiment, the outer diameter of the impeller casing 11 is
4, the agitation flow V and water W can smoothly flow into the earth and sand suction port 3 through the through hole 22.

Further, the suction position control sleeve 30 is not limited to the one having the above configuration, and for example, the suction position control sleeve 30 is
As shown in FIGS. 2 to 7, the suction position control sleeve 30 can be made narrower than the sleeve 30 in FIGS. 2 to 4.

In this case, as shown in FIG. 7, even if the suction position control sleeve 30 is grounded, the upper part of the stirring flow forming space S is open, so the opening and the through hole 22 of the cylindrical part 15 can be passed through the upper part of the stirring flow forming space S. , a large amount of water W can be mixed into the stirring flow V.

In addition, in this way, the suction position control sleeve 3
When 0 is a narrow width, the suction position can be controlled by changing the suction position between the strainer 14 and the ground surface even when the cylindrical strainer 14 is made non-porous.

In the above embodiment, the shape of the impeller casing 11 may be a volute type or other shape, and a strainer or the like may be attached to the lower part. In addition, 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.

As described above, in the present invention, by moving the suction position control sleeve up and down along the outer circumference of the cylindrical strainer and the outer circumference of the support leg,
The suction position of the concentration adjustment opening provided in the cylindrical part of the cylindrical strainer can be adjusted, as well as communication and shielding between the outside and all or part of the agitation flow formation space, so the sediment concentration of the agitation flow can be adjusted. Regardless of the soil concentration, whether the concentration is high, medium, or low, the suction work can be performed without reducing the suction efficiency of the pump, and the rotary motor can be prevented from accidents such as burnout. can do.

In particular, in the present invention, by moving the water absorption position control sleeve up and down, a flow path that flows from the agitation flow formation space into the internal space of the cylindrical strainer through the through hole provided in the bottom plate and the agitation flow formation space are created. A flow path can be selected within the cylindrical strainer through a through hole that extends outward from the cylindrical strainer and is provided on the circumferential surface of the cylindrical strainer.

Therefore, it is possible not only to adjust the concentration but also to create a flow path that is suitable for the installation surface of the submersible pump.

[Brief explanation of the drawing]

1 to 7 are structural explanatory diagrams of a submersible pump according to the present invention, and FIG. 8 is a structural explanatory diagram of a conventional submersible pump. In the figure, S... Stirring flow forming space, W... Water, 20
... Support leg, 11 ... Impeller casing, 12
... Impeller, 13 ... Sediment suction port, 14 ... Cylindrical strainer, 15 ... Cylindrical part, 16 ... Bottom plate,
17... Central opening, 18... Output shaft, 19... Stirring cutter, 21, 22... Through hole, 30... Sleeve for controlling suction position.

Claims (1)

[Scope of claim for utility model registration] Rotating motor B built in pump casing A
, an impeller casing 11 connected to the lower part of the casing A, and a cylindrical strainer 14 with a bottom plate 16 connected to the lower end of the impeller casing 11.
, a support leg 20 connected to the lower end of the cylindrical strainer 14 , and a support leg 20 connected to the lower end of the cylindrical strainer 14 .
An output shaft of a rotary motor extends into the stirring flow forming space S through a central opening 17 provided in the impeller casing 11 and the bottom plate 16 of the cylindrical strainer 14. 18 and an impeller 12 fixed to the output shaft 18 in the impeller casing 11, the bottom plate 16 has a plurality of holes that communicate the stirring flow forming space S and the internal space of the cylindrical strainer 14. The cylindrical portion 1 of the cylindrical strainer 14 is provided with the through hole 21 of
A through hole 22 for concentration adjustment is provided in the cylindrical portion 1.
A sleeve 30 for controlling the water absorption position is attached to the support leg 5 and the support leg 20 so as to be movable up and down along the outer peripheral surface, and the water absorption position of the through hole 22 for concentration adjustment is changed up and down, and the water absorption position is changed from the stirring flow forming space S to the through hole 21. It is possible to select a flow path that flows into the internal space of the cylindrical strainer 14 through the impeller casing, and a flow path that flows out from the stirring flow forming space S to the outside and flows into the cylindrical strainer 14 through the through hole 22. A submersible pump equipped with a concentration adjustment mechanism characterized in that the outer diameter of the strainer 11 is larger than the outer diameter of the cylindrical strainer 14.