JPH08326692A - Cutter fan of submerged pump - Google Patents

Abstract

PURPOSE: To improve anticorrosion and abrasion resistance property, lighten weight, facilitate assembling/disassembling work, and improve practicability in a cutter fan for submerged pump. CONSTITUTION: A cutter fan 1 consists of an impeller part 2 made of a non- metal material such as rubber, resin, and a boss part 3 made of a metal material whose upper and lower end surfaces is exposed and embedded inside the blade part 2. In the boss part 3, a female screw hole 4 is formed on an upper end surface to screw it around the male screw of the output shaft, and also a non- circular recessed hole 14 for operation is formed on a lower end surface, and means 10, 12 for preventing the blade part 2 from slipping-out downward, and for preventing idling, are formed on an intermediate part.

Description

Detailed Description of the Invention

[0001]

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

[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. This submersible pump 51 is shown only on the lower end side while omitting the upper part from the middle part of the impeller casing 52, but the earth and sand suction port 53 is formed at the center of the bottom wall of the impeller casing 52. A cylindrical strainer 55 with a bottom plate 54 is connected to the lower end of the impeller casing 52 outside the suction port 53. The bottom plate 54 is provided with a central opening 57,
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 inside the impeller casing 52, and a cutter fan 60 is attached to the lower portion of the bottom plate 54 by screw fitting. Reference numeral 62 denotes a boss portion of the cutter fan 60, and a female screw hole formed on the inner peripheral surface is screwed into a male screw formed on the outer peripheral surface of the output shaft 58 when the screw is fitted. 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, is fitted to the output shaft 58 by a screw in the direction opposite to the pump rotation direction, and tightening torque is applied by the pump operation. . Therefore, when assembling the cutter fan 60, it is necessary to give a certain tightening torque assuming the pump reverse rotation operation at the time of test operation, and it is necessary to release the torque tightened by the operation at the time of disassembly. Normally, a tool cannot be used due to its shape in giving a torque at the time of assembling and disassembling, and a method of hitting a protrusion on the outer circumference 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 the weight is increased, but also the slurry is abraded by the slurry in the sucked liquid, and depending on the liquid quality. May be corroded. Therefore, it has been attempted to manufacture the entire cutter fan 60 with a lightweight urethane resin that has excellent corrosion resistance and wear resistance, but in this case the torque transmission function during installation and removal is impaired, and the output There is a problem that the screw fitting with the shaft 58 becomes uncertain (the familiar condition caused by different materials, the screw damage on the boss portion).

Therefore, the present invention solves the above-mentioned conventional problems, is excellent in corrosion resistance and wear resistance, is light in weight, and does not impair the torque transmission function, and is assembled and disassembled. It is an object of the present invention to provide a cutter fan for a submersible pump that is easy to work and highly practical.

[0006]

In order to achieve the above object, the invention of claim 1 is such that a cylindrical strainer with a bottom plate is connected to the 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 a submersible pump in which the output shaft of the rotary motor extends downward through the opening, and the blade part is made of a non-metallic material such as rubber or resin,
The upper and lower end surfaces are exposed and buried in the inside of the vane portion, and the boss portion is made of a metal material. The boss has a female screw hole that is screwed into the external thread of the output shaft on the upper end surface, a non-circular concave hole for operation is formed on the lower end surface, and the lower part of the blade part does not come off. And means for preventing idling are formed. The invention of claim 2 relates to claim 1
In the invention described above, in place of the non-circular concave hole formed in the lower end surface of the boss portion, a female screw hole is 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 attached by screwing.

[0007]

As described above, the cutter fan comprises the blade portion made of a non-metal material such as rubber or resin, and the boss portion made of a metal material with the upper and lower end surfaces exposed and embedded in the blade portion. Therefore, by screwing the female screw hole on the upper end surface of the boss portion made of the metal material to the male screw of the output shaft, the output shaft can be securely screwed, and the torque transmission function is impaired. There is no. Moreover, the blade part made of a non-metallic material makes it possible to have excellent corrosion resistance and wear resistance, and in addition to achieving weight reduction, a non-circular recess for operation formed on the lower end surface of the boss part. The cutter fan can be easily removed from the output shaft by fitting and rotating the operation member at a place, and the assembling and disassembling operations are facilitated.

[0008]

1 is a front view showing a cutter fan which is attached to an output shaft of a rotary motor of a submersible pump according to an embodiment of the present invention 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 with its upper and lower end surfaces exposed and embedded inside the blade portion. It consists of 3. Although not shown in the drawings, the cutter fan 1 is fixed to, for example, an aluminum mold with the boss portion 3 as a core metal and preheated.
A urethane resin in a liquid state and a curing agent are heated and mixed, poured into a mold by a pump, demolded after curing, and burrs are removed to obtain a product. As shown in detail in FIG. 3, the boss portion 3 has an upper large diameter portion 3a.
And a lower diameter small portion 3b are integrally connected to each other, and a female screw hole 4 for screwing a male screw of the output shaft 58 is formed on an upper end surface of the upper diameter large portion 3a. 5 is an upper diameter large part 3
The upper end surface of the blade portion 2 is adapted to be locked by the flange portion forming the lower end of a. The lower small diameter portion 3b is the blade portion 2
The conical portion 7 and the cylindrical portion 8 each have a larger diameter in the lower portion in order to prevent the lower portion from coming off. The diameter of the cylindrical portion is substantially the same as the upper diameter of the conical portion 7.

A cutout groove is provided on the outer surface of the conical portion 7 of the lower small diameter portion 3b to prevent the vane portion 2 from falling out, as described above.
10 is formed over the entire circumference of the middle portion thereof, and a plurality of cutout grooves 12 for preventing the idle rotation of the blade portion 2 are formed in the circumferential direction orthogonal to the cutout groove 10 (in this example, 4
Pieces) are formed. These notch grooves 10 and 12 of the conical portion 7
The outer surface shape of the conical portion 7 itself constitutes a means for preventing slipping out and preventing idling. A non-circular concave hole 14 for operation is formed on the lower end surface of the cylindrical portion 8. In this example, the non-circular recessed hole 14 is a hexagonal hole into which a hexagonal wrench (not shown) as an operating member fits. In FIGS. 1 and 2, reference numeral 15 is a non-circular concave hole formed in the lower end surface of the blade portion 2 so that the surface phase thereof coincides with the non-circular concave hole 14 of the boss portion when the blade portion is molded.

Since the boss 3 made of a metal material is formed on the upper end surface of the upper diameter large portion 3a, the screw hole 4 is screwed onto the male screw of the output shaft 58 to form the output shaft. It is possible to securely fit the screw to the 58. Therefore, the torque transmission function is not impaired as in the conventional case. Moreover, since the blade portion 2 is made of a non-metallic material, the blade portion 2 has excellent corrosion resistance and wear resistance, and can be made lightweight.

To remove the cutter fan 1 from the output shaft 58, a hexagon wrench is fitted in the non-circular recess 14 formed in the lower end surface of the conical portion 7 of the lower diameter small portion 3b of the boss portion 3 and turned in the loosening direction. Move. Due to this rotation, the cutter fan 1 is rotated so that the female screw hole 4 is disengaged from the male screw of the output shaft 58. Therefore, as shown in FIG. 5, a cylindrical strainer 55 with a bottom plate 54 is provided at the lower end of the impeller casing 52.
Even in a state in which the central opening 57 provided in the bottom plate 54 is smaller than the maximum diameter of the cutter fan 1 and larger than the diameter of the boss part 3, the boss part 3 is located inward of the bottom plate 54. Even if the blade portion 2 is located outside, 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 may be performed. Since the cutter fan 1 can be easily attached and detached as described above, the assembling and disassembling operations can be facilitated.

FIG. 4 shows another embodiment. The cylindrical portion 8 of this embodiment has a female screw hole 16 formed in its lower end surface, and the female screw hole has a non-circular concave hole 17 for operation. The nut 18 is screwed on and fixedly attached at the request. The non-circular recessed hole 17 of the nut 18 is also a hexagonal hole into which a hexagonal wrench fits, similarly to the above. In the case of this embodiment, since the non-circular recessed hole 17 is not directly formed in the cylindrical portion 8 as in the previous embodiment, but is formed in the nut 18 as a separate member, the nut 18 is hard to corrode, for example, stainless steel. If it is made of a material, it can be used for a long period of time without rusting the non-circular concave hole 17.

It should be noted that the boss portion 3 shown in the above embodiment is only a preferable example. As described in the examples, the detailed design such as the specific shape and structure 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]

Since the invention of claim 1 is constructed as described above, it is lighter in weight, more excellent in corrosion resistance and abrasion resistance than that made entirely of metal, and non-existent when assembled and disassembled. The tightening and loosening torque can be applied without affecting the blade portion made of the metal material. In addition, it is not necessary to give a shock to the blade part with a hammer etc., and it can be easily removed from the output shaft, so it is easy to disassemble and assemble, and there is no need to worry about the blade chipping due to the shock. There is an effect. According to the second aspect of the invention, when the screw member is made of a material such as stainless steel which does not easily corrode, excellent effects such as long-term use without the rust of the non-circular concave hole can be expected.

[Brief description of 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 above.

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

FIG. 4 shows another embodiment, (A) is a partially omitted front view, and (B) is a bottom view of a substantially half portion.

FIG. 5 is a front view with a main part broken showing a conventional submersible pump.

[Explanation of symbols]

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

Claims (2)

[Claims] 1. A cylindrical 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 which 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 a submersible pump comprising: a blade part made of a non-metallic material such as rubber or resin; and a metal material having upper and lower end surfaces exposed and embedded inside the blade part. The boss has a female screw hole that is screwed into the male screw of the output shaft and is formed on the upper end surface of the boss.
A cutter fan for a submersible pump, characterized in that a non-circular concave hole for operation is formed on a lower end surface thereof, and a means for preventing the blade portion from coming out downward and preventing idling is formed at an intermediate portion. 2. A screw member having a female screw hole formed in the lower end surface of the boss portion, instead of the non-circular recess hole formed in the lower end surface of the boss portion, and having a non-circular recess hole for operation in the female screw hole. The cutter fan for a submersible pump according to claim 1, wherein the cutter fan is attached by screwing.