JPH10220385A - Underwater pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underwater pump which prevents deterioration of suctioning efficiency caused by entwinding of strap-like materials around a rotary shaft of the underwater pump, and is reduced in its size. SOLUTION: Fluid is suctioned from a suctioning port 15 into a pump casing 11 by starting an underwater pump and rotating an impeller 12. Large foreign materials and wastes are trapped by a perforated bottom plate 16 serving as a filter and finely cut by blades 20, 21 rotated coaxially with the impeller 12 for removal. Strap-like foreign materials, being caught by a guide member 19 serving as a rotary shaft of the blades 20, 21, are guided to its conical outer surface and fed to the upper side. The strap-like foreign materials are cut at a specified position of the guide member 19 by means of a cutter 22 into small pieces. The resultant pieces are suctioned together with slurry for removal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a submersible pump which is installed in water to suck water, sludge and the like.

[0002]

2. Description of the Related Art Generally, in this type of submersible pump, there is a problem that dirt and string-like objects are entangled on a rotating shaft or the like, clogging is caused, and suction efficiency is deteriorated. . In order to solve this problem,
Conventionally, the one described in Japanese Utility Model Laid-Open No. 3-68991 is known. In this submersible pump, a suction port including a large number of small-diameter openings is formed in a pump casing. Then, the rotating body (brush-shaped one) is rotated by the driving device while approaching the suction port, and foreign matter in the sludge water caught on the suction port is removed.

[0003]

However, such a conventional submersible pump has the following disadvantages. First, since the rotating shaft of the pump protrudes outside the casing, a string-like object is entangled with the rotating shaft, and it is necessary to frequently remove dirt, foreign matter, and the like in the string shape. Also, in this case, string-like debris had to be removed using other equipment and machinery. Furthermore, since a separate rotating body is attached to the submersible pump, the size of the pump itself increases, and it is inconvenient to move the pump to another location.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to reliably prevent a reduction in suction efficiency due to entanglement of a string-like object on a rotating shaft of a submersible pump. An object of the present invention is to provide a miniaturized submersible pump.

[0005]

According to a first aspect of the present invention, there is provided a pump casing having a suction port, an impeller rotatably provided in the pump casing, and sucking fluid from the suction port into the pump casing. A bottom plate fixed to the pump casing so as to cover the suction port and having a plurality of small holes communicating between the inside and outside of the pump casing; and a blade rotatably provided close to and facing the small hole forming portion of the bottom plate. The submersible pump includes a member, a conical guide member that supports the blade member, and a cutter that cuts a string-shaped object wound around the outer peripheral surface of the guide member.

According to a second aspect of the present invention, in a submersible pump for sucking a fluid from a suction port, a filter covering the suction port, and a rotatable rotatable so as to be able to cut and crush the inclusions in the fluid trapped by the filter. Is a submersible pump provided with a blade provided on a rotary shaft of the blade and a cutter for cutting a cord-like material wound around the rotating shaft of the blade.

[0007]

In the submersible pump according to the first aspect, the impeller rotates to suck fluid from the suction port into the pump casing. At this time, the suction port is covered with a bottom plate,
The inside and outside of the pump casing communicate with each other through a plurality of small holes. Therefore, for example, string-like contaminants contained in the fluid may catch on the small hole forming portions of the bottom plate. However, the rotating blade member does not cut and crush the string-like contaminants, and the small holes are not closed.
Further, even if the string-like foreign matter is wound around the guide member supporting the blade portion, the foreign matter is collected at a predetermined position by being guided by the conical guide member. Then, the string-like contaminants wrapped around the outer peripheral surface of the guide member are cut by a cutter and eliminated.

[0008] In the submersible pump according to claim 2,
The submersible pump sucks fluid from the suction port, and at this time, inclusions (contaminants) in the fluid are trapped by a filter covering the suction port. The inclusion trapped by the filter is cut and crushed by the rotating blade. Further, the string-shaped inclusion wound around the rotating shaft of the blade is cut by a cutter. Thus, the inclusions caught on the filter and the blade can be easily removed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a submersible pump according to the present invention will be described below with reference to the drawings. 1 to 6 are views for explaining a submersible pump according to one embodiment of the present invention. In these figures, reference numeral 11 denotes a pump casing, and an impeller 12 is rotatably supported inside the pump casing 11. 13 is the impeller 12
The rotary shaft 14 is its bearing. A circular suction port 15 is formed at the bottom of the pump casing 11, and a bottom plate 16 is fixedly provided so as to cover an opening except for the center of the suction port 15. A circular opening 17 is formed in the center of the bottom plate 16.
A large number of small holes 18 are formed in an annular portion extending in the circumferential direction around the center 7. The annular portion in which the hole 18 is formed is formed over a predetermined width of the bottom plate 16, and the mechanical strength of the bottom plate 16 itself is maintained.

Here, the rotating shaft 13 of the impeller 12 is installed coaxially with the suction port 15, and a lower end (tip) of the rotating shaft 13 has a guide member 19 which expands downward and conical. Is fixed. Guide member 1
9 passes through the circular opening 17 of the bottom plate 16 and its lower end projects below the bottom plate 16.

A pair of blades 20 and 21 are horizontally fixed to the expanded lower end of the guide member 19. The blades 20 and 21 are mounted on the outer surface of the lower end of the guide member 19 at a distance of about 180 °. In addition, blades 20, 2
1 rotates integrally with the rotating shaft 13, and further reduces the resistance of fluid accompanying the rotation by blades 20,
21 are each formed to be curved. It is formed to be curved so as to be convex with respect to the rotation direction (X direction in FIG. 2). Further, the blades 20 and 21 have blades formed on the upper surface thereof, and the blades can rotate near the hole 18 forming portion of the bottom plate 16 to cut and crush dust and foreign matter caught in the hole 18. It is configured. That is, the lower surface of the bottom plate 16 and the upper surfaces of the blades 20 and 21 face each other with a slight gap.

Further, a cutter 22 shown in FIG. 5 is fixed and arranged near the outer peripheral surface on the root side (small diameter portion on the rotating shaft side) of the guide member 19. The cutter 22 is capable of cutting and crushing string-like foreign matter wound on the outer surface of the conical guide member 19 having a thin connection end with the upper rotating shaft 13 and a thick lower blade fixed end. It is configured. The tip of the blade of the cutter 22 is provided close to the outer surface and the tip is downward.

In the submersible pump according to the above configuration,
By starting the pump and rotating the impeller 12, the fluid is sucked through the suction port 15. At this time, large foreign matters and dust are trapped by the perforated bottom plate 16 as a filter, and are finely cut by the rotating blades 20 and 21 to be removed. The string-like foreign matter caught on the guide member 19, which is the rotation axis of the blades 20, 21, is guided upward by the conical outer surface and sent upward.
The string-like foreign matter is cut by the cutter 22 at a predetermined position of the guide member 19 to become small pieces, which are sucked and removed together with a fluid (sludge, water, etc.).

As described above, in the submersible pump according to the present invention, the operation can be performed by completely removing the inclusions in the water such as dirt and foreign matter, and the pumping efficiency can be improved. FIG. 5 shows the result of the test operation of this pump. It is a 60 Hz performance curve diagram. The pump used was 3.7 KW, the rated current value was 15.0 A, and the rotation speed was 1
800 rpm.

[0015]

As described above, according to the present invention, a downsized submersible pump can be provided. At the same time, dust and foreign substances can be easily removed by the pump itself. In addition, it is possible to provide a submersible pump in which string-like impurities are less likely to be caught on the rotating shaft portion and can be easily removed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a submersible pump according to one embodiment of the present invention.

FIG. 2 is a half sectional bottom view showing a main part of the submersible pump according to one embodiment of the present invention.

FIG. 3 is a front view showing a guide member of the submersible pump according to one embodiment of the present invention.

FIG. 4 is a perspective view showing a blade portion of the submersible pump according to one embodiment of the present invention.

FIG. 5 is a perspective view showing a cutter of the submersible pump according to one embodiment of the present invention.

FIG. 6 is a graph showing an operation test result of the submersible pump according to one embodiment of the present invention.

[Explanation of symbols]

 11 pump casing, 12 impeller, 13 rotating shaft, 15 suction port, 16 bottom plate (filter), 18 holes, 19 guide member, 20, 21 blade, 22 cutter.

Claims (2)

[Claims] A pump casing having a suction port, an impeller rotatably provided in the pump casing, and sucking fluid from the suction port into the pump casing; a pump casing fixed to the pump casing so as to cover the suction port; A bottom plate having a plurality of small holes communicating with the inside and outside of the pump casing; a blade member rotatably provided near and facing the small hole forming portion of the bottom plate; and a conical guide member for supporting the blade members And a cutter for cutting a string wound around the outer peripheral surface of the guide member. 2. A submersible pump for sucking a fluid from a suction port, comprising: a filter for covering the suction port; and a filter for cutting off inclusions in the fluid trapped by the filter.
A submersible pump including a blade rotatably provided so as to be crushable, and a cutter for cutting a cord-like material wound around a rotating shaft of the blade.