JPH09228978A - Vortex pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vortex pump which can effectively prevent wearing and damaging of an impeller even when solid matter of large diameter flows in an impeller casing. SOLUTION: In a vortex pump A rotatably mounting an impeller 14 in an impeller casing 10 and providing a clearance L of sufficient dimension between a blade mounting surface of the impeller 14 and an internal surface of a suction side cover 15 of the impeller casing 10, a porous strainer 18 covering the blade mounting surface of the impeller 14 protected is mounted in the impeller casing 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vortex pump capable of preventing wear and damage of an impeller as much as possible.

[0002]

2. Description of the Related Art When draining muddy water mixed with earth and sand or sewage mixed with dust with a normal centrifugal pump, solid matter such as lumps of stones or food scraps may be clogged in the impeller to make it impossible to pump water. In such cases, the pump must be disassembled to remove solids. The effort involved is not negligible in terms of time and money. Therefore, in recent years, there is a tendency to use a pump that is less likely to be clogged with solids even if the pump efficiency is somewhat low. As such a pump, there is a vortex pump B shown in FIG. As shown, the vortex pump B is characterized in that a large gap G is provided between an impeller 51 rotatably arranged in the impeller casing 50 and a suction side cover 52 of the impeller casing 50. With such a configuration, the vortex pump B can transfer even the solid matter S having a size similar to the diameter of the suction opening 53 provided at the center of the suction side cover 52 of the impeller casing 50 without being clogged.

[0003]

However, the above-mentioned conventional vortex pump B still has the following problems to be solved. That is, as shown in FIG.
Solid matter S flowing in through 3 directly impeller 51
It collides with the blade mounting surface of the
The impeller 51 is severely worn to shorten its life, and depending on the size and hardness of the solid S, the impeller 51
In some cases, damage was caused.

The present invention has been made in view of such circumstances, and even if a solid material having a large diameter flows into the impeller casing, the vortex pump can effectively prevent the impeller from being worn or damaged. The purpose is to provide.

[0005]

According to the present invention, there is provided a semiconductor device comprising:
The vortex pump described is a vortex pump in which an impeller is rotatably mounted in an impeller casing, and a sufficiently large gap is provided between a blade mounting surface of the impeller and an inner surface of a suction side cover of the impeller casing, Inside the impeller casing, a porous strainer that covers and protects the blade mounting surface of the impeller is mounted. A vortex pump according to a second aspect is the vortex pump according to the first aspect, wherein the porous strainer is made of a perforated plate made of punching metal. Claim 3
In the vortex pump described in claim 1, in the vortex pump according to claim 1, the porous strainer is formed from a plurality of wire rods extending radially from a central portion of the impeller to the outside.

According to another aspect of the vortex pump of the present invention, the impeller is rotatably mounted in the impeller casing, and a sufficiently large gap is provided between the blade mounting surface of the impeller and the inner surface of the suction side cover of the impeller casing. Provided, and the output shaft of the electric motor for fixing the impeller is projected to the outside through a suction opening provided in the center of the suction side cover, in a vortex pump with a stirring blade attached to the projecting end, in the impeller casing, A perforated strainer made of a perforated plate that covers and protects the blade mounting surface of the impeller and has a through hole for inserting the output shaft in the center is attached. A vortex pump according to a fifth aspect is the vortex pump according to the fourth aspect, wherein the porous strainer is formed of a porous plate made of punching metal. A vortex pump according to a sixth aspect is the vortex pump according to the fourth aspect, wherein the porous strainer is formed from a plurality of wire rods extending radially from a central portion of the impeller to the outside.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, with reference to the attached drawings, several embodiments embodying the present invention will be described for the understanding of the present invention.

(First Embodiment) First, FIG. 1 and FIG.
The configuration of the vortex pump A according to the first embodiment of the present invention will be specifically described with reference to FIG. As shown in FIG. 1, the vortex pump A according to the first embodiment.
Is a hollow tire-shaped impeller casing 10 in which a motor casing 11 is continuously provided, and the motor casing 1
1, an electric motor 12 is disposed, an output shaft 13 of the electric motor 12 is projected into the impeller casing 10, and an impeller 14 that is rotatable inside the impeller casing 10 is attached to the protruding end.

In the vortex pump A, a large solid matter F is passed through the suction opening 16 provided in the suction side cover 15 of the impeller casing 10 to the impeller casing 1.
In order to allow suction into 0, a gap L having a sufficient length is provided between the blade mounting surface of the impeller 14 and the suction side cover 15. With this configuration, the vortex pump A
By rotating the impeller 14 by driving the electric motor 12, even a large-diameter solid F is sucked into the impeller casing 10 and then smoothly discharged to the side wall of the impeller casing 10. It can be discharged to a desired place through 17.

Vortex pump A according to the present embodiment
Is characterized in that, in addition to the above-mentioned basic configuration, a configuration is added in which the impeller 14 can be prevented from being worn or damaged by the solid matter F as much as possible. That is, as shown in FIGS. 1 and 2, the impeller casing 1
Inside 0, a perforated strainer 18 that covers and protects the blade mounting surface of the impeller 14 is mounted. In the present embodiment, the porous strainer 18 is a punched metal porous plate 2 having a large number of through holes 19 of a required diameter provided over the entire surface.
0. As shown in the drawing, the perforated plate 20 is formed of a conical disc having a diameter substantially the same as that of the impeller 14, and its outer peripheral edge portion is circumferentially spaced along the outer peripheral edge portion of the impeller 14. The guide vanes 21 are attached to the plurality of guide vanes 21 arranged, while these guide vanes 21 are attached to the inner surface of the upper wall 22 of the impeller casing 10. At this time, since the perforated plate 20 is worn by the solid material F, it is desirable that the perforated plate 20 be attached to the guide vanes 21 by the connecting bolts 23 in order to facilitate replacement. In the present embodiment, the through hole 24 for inserting the impeller attachment nut 13a attached to the tip of the output shaft 13 of the electric motor 12 is provided in the central portion of the perforated plate 20, but the impeller attachment By shortening the nut 13a, the through hole 2
Alternatively, the perforated plate 20 may be formed of punching metal over the entire surface without the need for the step 4.

Hereinafter, the operation of the vortex pump A having the above-described structure, particularly the operation of the porous strainer 18 will be described. As described above, the driving of the electric motor 12 rotates the impeller 14, and the rotation causes the solid matter F having a small diameter to a large diameter to be sucked and flowed into the impeller casing 10. However, in this embodiment, the impeller 14 is protected by the perforated plate 20.
Since it is covered, the large-diameter solid material F cannot pass through the through hole 19. Therefore, these large diameter solids F
It is possible to prevent as much as possible from colliding with the impeller 14 to wear or damage the impeller 14. Therefore, it is possible to perform the work of discharging the earth and sand and the sewage without frequently replacing the impeller 14, so that the work efficiency can be improved and the impeller 14 made of a high-quality material can be used.
Since the number of times of exchanging can be remarkably reduced, the economical efficiency can be improved. Further, since the porous strainer 18 is composed of the perforated plate 20 made of punching metal, it can be manufactured at low cost.

When the vortex pump A is operated, the electric motor 12 is driven to drive the impeller 1
4 is rotated, and this rotation causes the impeller casing 1
The water that is sucked in and flows in with the solid matter F mixed in 0 passes through the through hole 19 and the impeller 14 together with the solid matter F having a small diameter, and then passes through the through hole 19 again and then inside the impeller casing 10. And will be fed toward the discharge pipe 17. That is, even if the impeller 14 is covered and protected by the perforated plate 20, the suction of the vortex pump A
The discharge capacity is hardly affected, and the suction / discharge capacity similar to that of the vortex pump without the porous plate 20 can be exhibited.

(Second Embodiment) Next, FIG. 3 and FIG.
The configuration of the vortex pump A1 according to the second embodiment of the present invention will be described with reference to FIG. As shown in the figure, the vortex pump A1 according to the present embodiment has the same basic configuration as the vortex pump A according to the first embodiment described above, and therefore, the same configurations will be denoted by the same reference numerals and the description thereof will be omitted. Is omitted. In the vortex pump A1 according to the present embodiment, as shown in FIGS. 3 and 4, the porous strainer 25 that covers and protects the blade mounting surface of the impeller 14 is substantially provided over the entire surface of the blade mounting surface of the impeller 14. It is characterized by being formed from a plurality of wire rods 26 provided.

As shown in FIGS. 3 and 4, the impeller 14
A central wire rod connecting piece 27 having a through hole for inserting the impeller mounting nut 13a is arranged immediately below the center of the blade mounting surface. The inner ends of a large number of wire rods 26 radially extending from the central portion of the blade mounting surface of the impeller 14 toward the peripheral edge portion are attached to the central wire rod connecting piece 27, and the outer ends of these wire rods 26 are attached. Are attached to a plurality of guide vanes 28 that are circumferentially spaced along the outer peripheral edge of the impeller 14. On the other hand, these guide vanes 28 are attached to the inner surface of the upper wall 22 of the impeller casing 10. On this occasion,
Since the wire 26 will be worn by the solid material F, its outer end has a connecting bolt 2 for easy replacement.
It is desirable that the guide vanes 28 be attached to the guide vanes 28. In addition, in the present embodiment, all the wire rods 2
The outer ends of 6 are connected to each other by the outer wire rod connecting ring 26a, which also facilitates the exchange of the wire rod 26.

Hereinafter, the operation of the vortex pump A1 having the above-mentioned structure, particularly the operation of the porous strainer 25 will be described. As described above, the electric motor 12
Is driven to rotate the impeller 14, and this rotation causes the solid matter F having a small diameter to a large diameter to be sucked and flowed into the impeller casing 10. However, in the present embodiment, since the impeller 14 is protected and covered by a large number of radially arranged wire rods 26, the large-diameter solid F can pass through the elongated through holes 30 formed between the wire rods 26. I can't. Therefore, it is possible to prevent the solid matter F having a large diameter from colliding with the impeller 14 and causing the impeller 14 to be worn or damaged. Therefore, it is possible to perform the work of discharging the earth and sand and the sewage without frequently replacing the impeller 14, so that the work efficiency can be improved and the impeller 14 made of a high-quality material can be used.
Since the number of times of exchanging can be remarkably reduced, the economical efficiency can be improved. Further, since the porous strainer 25 is composed of a large number of wire rods 26, it can be manufactured at low cost.

In the operation of the vortex pump A1 described above, the impeller 14 is rotated by the drive of the electric motor 12, and the water sucked and flowed in the impeller casing 10 with the solid matter F mixed therein has a small diameter. The solid F passes through the elongated through hole 30 and hits the impeller 14, and then passes through the through hole 30 again to be discharged into the impeller casing 10 and fed toward the discharge pipe 17. That is, even if the impeller 14 is covered and protected by a large number of wire rods 26, the suction / discharge capacity of the vortex pump A1 is hardly affected, and the same suction / discharge capacity as a vortex pump without a large number of wire rods 26 is provided. Will be able to demonstrate.

(Third Embodiment) Next, FIG. 5 and FIG.
The configuration of the vortex pump A2 according to the third embodiment of the present invention will be described with reference to FIG. As shown in the figure, the vortex pump A2 according to the present embodiment has a basic configuration in which the output shaft 31 of the electric motor 12 is different from that of the vortex pump A according to the first embodiment described above. The difference is that the impeller casing 10 is made to project downward through the suction opening 16 and a stirring blade (cutter) 33 is attached to the projecting end 32.
However, since the other configurations are the same as the basic configuration of the vortex pump A according to the first embodiment, the same configurations are denoted by the same reference numerals and the description thereof will be omitted.

Vortex pump A according to the present embodiment
5 and 6, substantially the same as the vortex pump A according to the first embodiment, the porous strainer 34 provided in the impeller casing 10 has a through hole 35 of a required diameter as shown in FIGS. Is formed from a perforated plate 36 made of punching metal provided over the entire surface. As shown in FIGS. 5 and 6, the perforated plate 36 is also made of a disc having substantially the same diameter as that of the impeller 14, and its outer peripheral edge portion is circumferentially spaced along the outer peripheral edge portion of the impeller 14. The guide vanes 37 are attached to a plurality of open guide vanes 37, while these guide vanes 37 are attached to the inner surface of the upper wall 22 of the impeller casing 10. At this time, the output shaft 31 is provided at the center of the porous plate 36.
A through hole 36a for inserting the through hole is provided. Further, since the perforated plate 36 is worn by the solid material F, it is desirable that the perforated plate 36 be attached to the guide vanes 37 by the connecting bolts 38 in order to facilitate replacement.

Hereinafter, the operation of the vortex pump A2 having the above-described structure, particularly the operation of the porous strainer 34 will be described. As described above, the electric motor 12
Is driven to rotate the impeller 14 and the stirring blade 33, and these rotations cause the solid matter F having a small diameter to a large diameter to be sucked and flown into the impeller casing 10. However, in the present embodiment, since the impeller 14 is protected and covered by the perforated plate 36, the large-diameter solid material F cannot pass through the through hole 35. Therefore,
It is possible to prevent the large-diameter solid matter F from colliding with the impeller 14 to wear or damage the impeller 14. Therefore, it is possible to perform the work of discharging earth and sand or dirty water without frequently replacing the impeller 14, so that the work efficiency can be improved and the number of times of replacement of the high-quality impeller 14 can be remarkably reduced. It will be possible to improve the sex. Also,
The perforated strainer 34 is a perforated plate 36 made of punching metal.
Since it consists of, it can be manufactured at low cost.

Further, in the operation of the vortex pump A2 described above, the impeller 14 and the stirring blade 33 are rotated by the drive of the electric motor 12, and the rotation causes the solid matter F to be sucked and flowed into the impeller casing 10 in a mixed form. Water passing through the through hole 35 and the impeller 14 together with the solid material F having a small diameter, then again passes through the through hole 35 and is discharged into the impeller casing 10 and fed toward the discharge pipe 17. become. That is, impeller 1
Even if 4 is covered and protected by the porous plate 36, the suction / discharge capacity of the vortex pump A2 is hardly affected, and the suction / discharge capacity similar to that of the vortex pump without the porous plate 36 can be exhibited. .

(Fourth Embodiment) Next, FIG. 7 and FIG.
The configuration of the vortex pump A3 according to the fourth embodiment of the present invention will be described with reference to FIG. As shown, the vortex pump A3 according to the present embodiment is the same as the vortex pump A2 according to the third embodiment.
Since the basic configurations are the same, the same configurations are denoted by the same reference numerals, and the description thereof will be omitted. In the vortex pump A3 according to the present embodiment, as shown in FIGS. 7 and 8, the porous strainer 40 that substantially covers and protects the blade mounting surface of the impeller 14 is provided over the entire surface of the blade mounting surface of the impeller 14. It is characterized by being formed from a plurality of wire rods 41 provided.

As shown in FIGS. 7 and 8, the impeller 14
A central wire rod connecting ring 42 having a through hole for inserting the output shaft 31 is arranged at a position directly below the central portion of the blade mounting surface. The inner ends of a large number of wire rods 41 extending radially from the central portion of the blade mounting surface of the impeller 14 toward the peripheral edge are attached to the central wire rod connecting ring 42, and the outer ends of these wire rods 41 are attached. Are attached to a plurality of guide vanes 43 arranged along the outer peripheral edge of the impeller 14 at intervals in the circumferential direction. On the other hand, these guide vanes 43 serve as the upper wall 2 of the impeller casing 10.
2 is attached to the inner surface. At this time, since the wire 41 is worn by the solid material F, it is desirable that the outer end of the wire 41 be attached to the guide vane 43 by the connecting bolt 44 in order to facilitate replacement. Further, in the present embodiment, the outer ends of all the wire rods 41 are connected by the outer wire rod connecting ring 41a, and this surface also facilitates the exchange of the wire rods 41.

Hereinafter, the operation of the vortex pump A3 having the above-described structure, particularly the operation of the porous strainer 40 will be described. As described above, the electric motor 12
Is driven to rotate the impeller 14 and the stirring blade 33, and this rotation causes the solid matter F having a small diameter to a large diameter to be sucked and flowed into the impeller casing 10. However, in the present embodiment, since the impeller 14 is protected and covered by a large number of radially arranged wire rods 41, the large-diameter solid material F can pass through the elongated through holes 45 formed between the wire rods 41. I can't. Therefore, these large-diameter solids F collide with the impeller 14 and
It can be prevented as much as possible from being worn or damaged. Therefore, it is possible to perform the work of discharging the earth and sand and the sewage without frequently changing the impeller 14.
The working efficiency can be improved, and the number of times of exchanging the impeller 14 made of a high quality material can be remarkably reduced, so that the economical efficiency can be improved. Further, since the porous strainer 40 is composed of many wire rods 41, it can be manufactured at low cost.

Further, in the operation of the vortex pump A3 described above, the impeller 14 and the stirring blade 33 are rotated by the drive of the electric motor 12, and the rotation causes the solid matter F to be sucked and flowed into the impeller casing 10 in a mixed form. Water is a long and narrow through hole 45 together with a small diameter solid F.
And then hits the impeller 14, and then again passes through the through hole 45 and is discharged into the impeller casing 10.
It will be fed toward the discharge pipe 17. That is, even if the impeller 14 is covered and protected by a large number of wires 41,
The suction / exhaust capacity of the vortex pump A3 is hardly affected, and the suction / exhaust capacity similar to that of the vortex pump having no many wire rods 41 can be exhibited.

Although the present invention has been described above with reference to some embodiments, the present invention is not limited to the configurations described in the above embodiments, and the scope of the claims is not limited thereto. It also includes other embodiments and modifications that are conceivable within the scope of the matters described. For example, the porous strainer has a conical shape, but may have a flat plate shape. Further, the impeller casing of the vortex pump may be configured so that it can be divided into upper and lower parts.

[0026]

In the vortex pump according to claims 1 to 3, the impeller is rotatably mounted in the impeller casing, and the size is sufficiently large between the impeller blade mounting surface and the suction side cover inner surface of the impeller casing. In a vortex pump having a gap of, a porous strainer that covers and protects the impeller blade mounting surface is installed in the impeller casing. Therefore, even if solids ranging from small diameters to large diameters are sucked and flowed into the impeller casing due to the rotation of the impeller, the impellers are protected and covered by the porous strainer, so large diameter solids must pass through the through holes. I can't. Therefore, it is possible to prevent the solid matter having a large diameter from colliding with the impeller and causing the impeller to be worn or damaged. Therefore, since it is possible to perform the work of discharging the earth and sand or the waste water without frequently changing the impeller, it is possible to improve the work efficiency, and it is possible to remarkably reduce the number of times of changing the impeller made of a high-quality material, which also improves the economical efficiency. It will be possible.

Particularly, in the vortex pump according to the second aspect, since the porous strainer is formed of the perforated plate made of punching metal, the porous strainer can be manufactured at low cost. In the vortex pump according to the third aspect, since the porous strainer is formed of a plurality of wires extending radially from the central portion of the impeller to the outside, the porous strainer can be similarly manufactured at low cost.

In the vortex pump according to any one of claims 4 to 6, the impeller is rotatably mounted in the impeller casing, and a sufficiently large gap is provided between the blade mounting surface of the impeller and the inner surface of the suction side cover of the impeller casing. The output shaft of the electric motor, which is provided and which fixes the impeller, is projected outside through a suction opening provided in the center of the suction side cover,
In this vortex pump with stirring blades attached to the output shaft, the impeller casing is formed of a perforated plate that covers and protects the blade mounting surface of the impeller and has a through hole for inserting the output shaft in the central portion. A perforated strainer is installed. Therefore, even if solid matter with a small diameter to a large diameter is sucked and flowed into the impeller casing by the rotation of the impeller and the stirring blade like the vortex pump having only the impeller, the impeller is protected and covered by the porous strainer. However, large-diameter solids cannot pass through the through holes. Therefore, it is possible to prevent these large-diameter solids from colliding with the impeller to wear or damage the impeller as much as possible. Therefore, it is possible to perform the work of discharging earth and sand and dirty water without frequently changing the impeller, so that the work efficiency can be improved and the number of times of changing the impeller made of a high-grade material can be remarkably reduced. It can be increased.

Particularly, in the vortex pump according to the fifth aspect, since the porous strainer is formed of the perforated plate made of punching metal, the porous strainer can be manufactured at low cost. In the vortex pump according to the sixth aspect, since the porous strainer is formed of a plurality of wires extending radially from the central portion of the impeller to the outside, the porous strainer can be similarly manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a vortex pump according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a partially cutaway front view of a vortex pump according to a second embodiment of the present invention.

FIG. 4 is a sectional view taken along the line BB of FIG.

FIG. 5 is a partially cutaway front view of a vortex pump according to a third embodiment of the present invention.

6 is a sectional view taken along the line CC of FIG.

FIG. 7 is a partially cutaway front view of a vortex pump according to a fourth embodiment of the present invention.

8 is a sectional view taken along the line DD of FIG.

FIG. 9 is a conceptual configuration explanatory diagram of a conventional vortex pump.

[Explanation of symbols]

A Vortex pump A1 Vortex pump A2 Vortex pump A3 Vortex pump F Solid matter L Gap 10 Impeller casing 11 Motor casing 12 Electric motor 13 Output shaft 13a Impeller mounting nut 14 Impeller 15 Suction side cover 16 Suction opening 17 Discharge pipe 18 Perforated strainer Hole 20 Perforated plate 21 Guide vane 22 Upper wall 23 Connecting bolt 24 Through hole 25 Perforated strainer 26 Wire rod 26a Outer wire rod connecting ring 27 Central wire rod connecting piece 28 Guide vane 29 Connecting bolt 30 Through hole 31 Output shaft 32 Projecting end 33 Stirring blade 34 Porous strainer 35 Through hole 36 Perforated plate 36a Through hole 37 Guide vane 38 Connecting bolt 40 Porous strainer 41 Wire rod 41a Outside wire rod connecting ring 42 Central wire rod connecting ring 43 Guy Devane 44 Connection bolt 45 Through hole

Claims (6)

[Claims] 1. A vortex pump in which an impeller is rotatably mounted in an impeller casing, and a sufficiently large gap is provided between a blade mounting surface of the impeller and an inner surface of a suction side cover of the impeller casing. A vortex pump characterized in that a perforated strainer that covers and protects the blade mounting surface of the impeller is installed in the impeller casing. 2. The vortex pump according to claim 1, wherein the porous strainer is formed of a punched metal porous plate. 3. The vortex pump according to claim 1, wherein the porous strainer is formed of a plurality of wires extending radially from a central portion of the impeller to the outside. 4. An impeller is rotatably mounted in an impeller casing, and a sufficiently large gap is provided between a blade mounting surface of the impeller and an inner surface of a suction side cover of the impeller casing. In a vortex pump in which the output shaft of the electric motor to be fixed is projected to the outside through a suction opening provided in the center of the suction side cover, and a stirring blade is attached to the projecting end, in the impeller casing, the blade mounting surface of the impeller is attached. A vortex pump which is covered and protected, and is equipped with a porous strainer made of a porous plate having a through hole for allowing the output shaft to pass therethrough. 5. The porous strainer is formed of a porous plate made of punching metal.
Vortex pump as described. 6. The vortex pump according to claim 4, wherein the porous strainer is formed of a plurality of wire rods radially extending from a central portion of the impeller to the outside.