JP2834031B2 - Submersible pump cutter fan - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter fan of a submersible pump for effectively sucking or excavating and sucking sediment on the seabed or the seabed.

[0002]

2. Description of the Related Art As an example of the above-mentioned submersible pump,
The one shown in FIG. 5 is conventionally known. The submersible pump 51 is illustrated only at the lower end side thereof by omitting the upper part from the middle part of the impeller casing 52, but a sediment suction port 53 is formed at the center of the bottom wall of the impeller casing 52 and is formed. At the lower end of the impeller casing 52 outside the suction port 53, a cylindrical strainer 55 with a bottom plate 54 is provided so as to be connected thereto. A central opening 57 is provided in the bottom plate 54,
An output shaft 58 of a rotary motor (not shown) extends downward through the opening. An impeller 59 is fixed to the output shaft 58 in the impeller casing 52, and a cutter fan 60 is attached to a lower portion of the bottom plate 54 by screw fitting. Reference numeral 62 denotes a boss portion of the cutter fan 60. A female screw hole formed on the inner peripheral surface of the boss portion of the cutter fan 60 is screwed to a male screw formed on the outer peripheral surface of the output shaft 58. 64 is a pump support leg connected to the lower end of the strainer 55.

Generally, the cutter fan 60 as described above is entirely made of metal, and is fitted to the output shaft 58 with a screw in the direction opposite to the pump rotation direction, so that a tightening torque is applied by operating the pump. . Therefore, when assembling the cutter fan 60, it is necessary to apply a certain amount of tightening torque in consideration of the pump reverse rotation operation during test operation, and it is necessary to release the tightened torque during operation when disassembling. Usually, a tool cannot be used to apply the torque at the time of assembling and disassembling because of its shape, and a method of hitting a projection on the outer periphery of the blade portion of the cutter fan 60 with a hammer or the like is adopted.

[0004]

When the entire cutter fan 60 is made of metal as described above, not only does the weight of the cutter fan 60 increase, it also wears out due to the slurry in the sucked-up liquid. May corrode. For this reason, attempts have been made to manufacture the entire cutter fan 60 from lightweight and urethane resin, which is excellent in corrosion resistance and wear resistance, but in this case, the torque transmission function at the time of installation and removal is impaired, and the output power is reduced. There is a problem that the screw fitting with the shaft 58 becomes uncertain (the degree of familiarity caused by dissimilar materials, screw damage to the boss).

Accordingly, the present invention solves the above-mentioned conventional problems, and is not only excellent in corrosion resistance and abrasion resistance and lightweight, but also can be assembled and disassembled without impairing the torque transmission function. An object of the present invention is to provide a submersible pump cutter fan that is easy to operate and has high practicality.

[0006]

In order to achieve the above object, according to the present invention, a tubular strainer with a bottom plate is connected to a lower end of an impeller casing, and a central opening is provided in the bottom plate. A cutter fan attached to the lower end of the output shaft of the submersible pump in which the output shaft of the rotary motor extends downward with the pump support leg through the opening, and a blade portion made of a nonmetallic material such as rubber or resin;
A boss portion made of a metal material is embedded in the inside of the blade portion with its upper and lower end surfaces exposed. The boss has a female screw hole on the upper end face to be screwed with the male screw of the output shaft, a non-circular concave hole for operation on the lower end face, and a middle part that prevents the blade part from falling down. And means for preventing idling. The invention of Claim 2 is Claim 1
In the invention, a female screw hole is formed in the lower end surface of the boss instead of the non-circular concave hole formed in the lower end surface of the boss portion, and a screw member having a non-circular concave hole for operation in the female screw hole is provided. It is screwed and attached.

[0007]

As described above, the cutter fan includes the blade made of a non-metallic material such as rubber or resin, and the boss made of a metal material whose upper and lower end surfaces are exposed and buried inside the blade. Therefore, by screwing the female screw hole on the upper end surface of the boss portion made of the metal material with the external thread of the output shaft, it is possible to securely screw-fit the output shaft, and the torque transmission function is impaired. There is no. In addition, the blades made of a non-metallic material make it possible to provide excellent corrosion resistance and abrasion resistance, reduce the weight, and, in addition to the non-circular concave portions for forming operations on the lower end surface of the boss portion. The cutter fan can be easily removed from the output shaft by fitting and rotating the operating member at the place, and assembling and disassembling operations are also facilitated.

[0008]

FIG. 1 is a front view showing a cutter fan which is an embodiment of the present invention and which is attached to an output shaft of a rotary motor of a submersible pump by screw fitting, and FIG. 2 is a bottom view thereof. Reference numeral 1 denotes a cutter fan. The cutter fan 1 includes a blade portion 2 made of a non-metallic material such as rubber or urethane resin, and a boss portion made of a metal material whose upper and lower end surfaces are exposed and embedded inside the blade portion. It consists of three. Although the cutter fan 1 is not shown, for example, the boss 3 is fixed to an aluminum mold as a core metal, and after preheating,
The urethane resin in a liquid state and the curing agent are heated and mixed together, poured into a mold by a pump, demolded after curing, and burrs are removed to obtain a product. As shown in detail in FIG.
The lower diameter portion 3b is integrally connected to the upper diameter portion 3a. The upper diameter portion of the upper diameter portion 3a is provided with a female screw hole 4 to be screwed with a male screw of the output shaft 58. 5 is a large upper part 3
The upper end surface of the blade portion 2 is locked by a flange portion forming the lower end of a. The lower diameter small portion 3b is the blade portion 2.
The cylindrical portion 8 includes a conical portion 7 having a large diameter at the lower side to prevent the lower portion from falling off, and the diameter of the cylindrical portion is substantially the same as the diameter of the upper portion of the conical portion 7.

A notch groove is provided on the outer surface of the conical portion 7 of the lower small diameter portion 3b to prevent the blade portion 2 from falling downward as described above.
10 is formed over the entire circumference of the intermediate portion, and a plurality of notch grooves 12 for preventing idle rotation of the blade portion 2 are arranged in a circumferential direction perpendicular to the notch grooves 10 (4 in this example).
Pieces) are formed. These notched grooves 10 and 12 of the conical portion 7
The shape of the conical portion 7 itself and the outer surface of the conical portion 7 constitute a means for preventing slippage and preventing idling. A non-circular concave hole 14 for operation is formed in the lower end surface of the cylindrical portion 8. In this example, the non-circular concave hole 14 is a hexagonal hole into which a hexagonal wrench (not shown) as an operation member is fitted. In FIGS. 1 and 2, reference numeral 15 denotes a non-circular recess formed in the lower end surface of the blade portion 2, which has the same phase as the non-circular recess 14 of the boss portion when the blade portion is formed.

With the above-described structure, the screw hole 4 formed on the upper end surface of the large diameter portion 3a of the upper portion of the boss portion 3 made of a metal material is screwed into the external thread of the output shaft 58, whereby the output shaft is It becomes possible to securely screw-fit to 58 and attach it. Therefore, the torque transmission function is not impaired as in the related art. In addition, since the blades 2 are made of a non-metallic material, the blades 2 are excellent in corrosion resistance and wear resistance, and can be reduced in weight.

In order to remove the cutter fan 1 from the output shaft 58, a hexagon wrench is fitted into a non-circular recess 14 formed on the lower end surface of the conical portion 7 of the small diameter portion 3b of the boss portion 3 and turned in the loosening direction. Move. With this rotation, the cutter fan 1 is rotated, and is released from the external thread of the output shaft 58 with which the female screw hole 4 is screwed. Therefore, a cylindrical strainer 55 with a bottom plate 54 is provided at the lower end of the impeller casing 52 as shown in FIG.
Even if the center opening 57 provided in the bottom plate 54 is smaller than the maximum diameter of the cutter fan 1 and the bottom plate 54 is larger than the diameter of the boss portion 3, the boss portion 3 is located inside the bottom plate 54, Even when the blade portion 2 is located outward, the fan 1 can be rotated, and the cutter fan 1 can be removed and attached without removing the bottom plate 54 or the strainer 55. When the cutter fan 1 is attached to the output shaft 58, basically the reverse operation is performed. As described above, since the attachment and detachment of the cutter fan 1 are simplified, the assembling and disassembling operations are also facilitated.

FIG. 4 shows another embodiment of the present invention. In this embodiment, the cylindrical portion 8 has a female screw hole 16 formed in the lower end surface thereof and a non-circular concave hole 17 for operation in the female screw hole. A nut 18 is screwed and fixedly attached at the request. The non-circular concave hole 17 of the nut 18 is also a hexagonal hole into which a hexagonal wrench is fitted as described above. In the case of this embodiment, the non-circular concave hole 17 is not formed directly in the cylindrical portion 8 as in the previous embodiment, but is formed in the nut 18 as a separate member. When made of a material, the non-circular concave hole 17 can be used for a long time without rust or the like.

Incidentally, the boss portion 3 shown in the above-described embodiment is merely a preferred example. As described in the embodiment, the detailed design such as the specific shape, structure, and the like of the cylindrical portion 8 in which the non-circular concave hole is formed can be arbitrarily changed within the scope of the technical matters described in the claims. .

[0014]

According to the first aspect of the present invention, since it has the above-described structure, it is lighter in weight, more excellent in corrosion resistance and abrasion resistance than those made entirely of metal, and can be used in non-assembly during disassembly. Loose tightening torque can be applied without affecting the blade portion made of a metal material. In addition, there is no need to apply impact to the blades with a hammer, etc., and it can be easily removed from the output shaft, making it easy to disassemble and assemble, and not having to worry about chipping of the blades due to impact. Has an effect. According to the second aspect of the present invention, when the screw member is made of a material such as stainless steel which does not easily corrode, it is possible to expect excellent effects such as elimination of rust and the like of the non-circular concave hole, which enables long-term use.

[Brief description of the drawings]

FIG. 1 is a front view showing a cutter fan according to an embodiment of the present invention.

FIG. 2 is a bottom view of the same.

3A and 3B show a boss portion of a cutter fan, wherein FIG. 3A is a plan view of a substantially half portion thereof, FIG. 3B is a partially cutaway front view, and FIG. 3C is a bottom view of a substantially half portion thereof.

4A and 4B show another embodiment, in which FIG. 4A is a front view partially omitted, and FIG. 4B is a bottom view of a substantially half portion.

FIG. 5 is a front view of a main part of the conventional submersible pump, with a main part broken.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cutter fan 2 Blade part 3 Boss part 4,16 Female thread hole 7 Conical part 8 Cylindrical part 10,12 Notch groove 14,15,17 Non-circular concave hole 18 Nut

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F04D 29/18-29/38

Claims (2)

(57) [Claims] A tubular strainer with a bottom plate is connected to the lower end of the impeller casing, and a central opening is provided in the bottom plate. Through the opening, the output shaft of the rotary motor extends downward with the pump support leg. A cutter fan attached to the lower end of the output shaft of the submersible pump, comprising: a blade portion made of a nonmetallic material such as rubber or resin; and a metal material having upper and lower end surfaces exposed and embedded inside the blade portion. And a female screw hole is formed on the upper end surface of the boss to screw with the external thread of the output shaft.
A cutter fan for a submersible pump, wherein a non-circular concave hole for operation is formed on a lower end surface, and means for preventing the blade portion from falling down and preventing idling are formed in an intermediate portion. 2. A screw member having a female screw hole formed in the lower end surface of the boss instead of the non-circular concave hole formed in the lower end surface of the boss, and having a non-circular concave hole for operation in the female screw hole. The cutter fan of the submersible pump according to claim 1, wherein the cutter fan is attached by screwing.