JPS6014953Y2 - submersible sand pump - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a submersible sand pump having a stirring blade at the bottom thereof.

[Conventional technology]

Conventional submersible sand pumps consist of a pump casing with a built-in stirring blade that stirs up and stirs up sediment at the bottom of the water, and an impeller that sucks up the rolled up sediment together with water. As a result, the downward water flow caused by the stirring blades and the upward flow caused by the impeller interfered with each other, resulting in poor efficiency.

In order to solve this drawback, as described in Japanese Utility Model Publication No. 51-38005, a porous strainer is disposed on the outer periphery between the suction port and the stirring blade, and the outer diameter of the stirring blade is attached to the lower end of the strainer. A submersible sand pump has been developed in which a circular notch of the same size is provided and an umbrella part that loosely fits into the circular notch is attached to the drive shaft of the stirring blade.

This submersible sand pump having an umbrella section on the stirring blade can separate the flow of the water flow of sediment into the disturbance flow and the rising water flow sucked into the strainer, thereby reducing mutual interference.

[Problem that the invention attempts to solve]

However, since the disturbance blade and the umbrella part are vertically separated from each other, a vacuum part in the paper occurs in the gap between them, causing vibrations and bubbles due to so-called cavitation, and furthermore, pebbles in the earth and sand collide with the shaft. The equipment was severely damaged and, furthermore, its efficiency as a sand pump was not sufficient.

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

[Means for solving problems]

Hereinafter, means for solving the above problems will be specifically explained based on the embodiment shown in the attached drawings.

In FIG. 1, a submersible sand pump 1 is vertically installed on a water bottom 2. As shown in FIG.

Such a submersible sand pump 1 includes a long pump casing 3 supported by a support frame 4 on an underwater bottom 2, a porous and cylindrical strainer 5 interposed between the pump casing 3 and the support frame 4, and a pump casing 3. A built-in motor 6, a stirring blade 7 fixed to a drive shaft 8 of the motor 6, an impeller 9 fixed to the drive shaft 8, and a sediment transport duct 10 whose one end is connected in communication with the upper end of the submersible sand pump 1. It consists of

FIG. 2 shows the lower structure of the submersible sand pump 1, and as shown in the figure, the sand turbulence flow and sand suction flow are as follows:
These are generated by the disturbance blades 7 and the impeller 9 when the drive shaft 8 of the motor 6 rotates.

In the figure, 9a is a suction opening formed at the bottom of the impeller 9.

The porous, cylindrical strainer 5 has at its lower end a horizontal end plate 11, which is also porous.

The horizontal end plate 11 has a circular opening 12 through which the disturbance blade 7 can pass.

As is clear from FIGS. 2 and 3, the disturbance blade 7 is
It is arranged directly under the circular opening 12 and has a truncated conical shape? a
, a plurality of blades 7b attached in the radial direction to the peripheral wall of the conical body 7a, and a connecting boss 7c that fixes the disturbance blade 7 to the lower end of the drive shaft 8.

Further, in FIGS. 2 and 3, 13 is a water flow separation disc that is integrally and continuously attached to the upper end of the truncated cone 7a, and the disc 13 has a groove or the like around the periphery. It has a completely circular shape without any holes, and is disposed within the circular opening 12.

Further, the disk has a diameter that is approximately equal to the diameter of the circular opening 12.

With the above configuration, there is no gap in the vertical direction between the stirring blade 7 and the disc 13, so that cavitation caused by the presence of the gap can be prevented from occurring.

Next, a description will be given of a soil sampling operation using the submersible sand pump having the above configuration.

The rotation of the drive shaft 8 of the motor 6 causes the stirring blades 7 and the impeller 9 to rotate simultaneously, causing water to flow as shown by the arrows in FIG. 2, first of all stirring up earth and sand at the bottom of the water.

Next, the water containing earth and sand is sucked into the pump casing 3 through the strainer 5 by the operation of the impeller 9, and then transported to a required location through the earth and sand transport duct 10.

[Effect of idea]

As described above, the present invention has the following effects.

(b) Water flows smoothly without cavitation, preventing vibrations, bubbles, and pebbles from colliding with the drive shaft and damaging the equipment.

Therefore, the life of the device can be extended.

Mouth: Since the cavitation described above can be prevented from occurring, water flow becomes smoother and suction efficiency can be improved.

[Brief explanation of the drawing]

FIG. 1 is a vertical front view of a submersible sand pump according to the present invention, FIG. 2 is a cross-sectional front view of the lower part of the submersible sand pump,
FIG. 3 is a perspective view of the disturbance blade. In the figure, 1: Submersible sand pump, 2: Underwater bottom, 3: Pump casing, 4: Support frame, 5 Ni strainer, 6: Motor,
7: Disturbing vane, 7a: truncated cone, 7b = vane, 7c:
Connection boss, 8: Drive shaft, 9: Impeller, 10: Earth and sand transport duct, 11: Horizontal end plate, 12: Circular opening, 13:
disk.

Claims (1)

[Scope of utility model registration request] a pump casing 3; a motor 6 disposed within the pump casing 3 and having a drive shaft 8 extending downward from the bottom of the pump casing 3; and a truncated motor 6 attached to the lower end of the motor 6 and fixed to the drive shaft 8. A disturbance blade 7 consisting of a cone 7a and blades 7b provided radially on the circumferential surface of the truncated cone 7a, fixed to the drive shaft 8 at a distance upward from the truncated cone 7a, and an impeller 9 having a suction opening 9a at the center of its lower surface; and a horizontal end plate 11 disposed in a direction perpendicular to the axis of the drive shaft 8 between the stirring blade 7 and the impeller 9 and having a circular opening 12 at the center. It consists of a porous and cylindrical strainer 5 interposed between the suction opening 9a and the horizontal end plate 11, and a completely circular disk 13 integrally attached to the upper end of the stirring blade 7. A submersible sand pump characterized in that a plate 13 is arranged concentrically within a circular opening 12, and the diameter of the circular plate 13 is approximately equal to the diameter of the circular opening 12.