JPH06221293A - All round flow type pump - Google Patents

Abstract

PURPOSE:To provide an all round flow type pump in which a pump can be protected from abrasion and choking. CONSTITUTION:An all round flow type pump comprises a pump casing including a suction side casing 1, a discharge side casing 6 and a cylindrical outer cylinder 9 for connecting the suction side casing 1 and the discharge side casing 6 to each other, a motor provided in the pump casing, and an impeller 15 accommodated in at least either the suction side casing 1 or the discharge side casing 6. A cyclone separator main body 2 comprising a cylindrical part 2a, a conical part 2b extended downward from the cylindrical part 2a, a suction port 2c provided on the cylindrical part 2a and a discharge port 2d provided under the conical part 2b is integrated with the suction side casing 1, and an upstream rising pipe 3 extended downward from the suction port of the suction side casing 1 is provided in the cyclone separator main body 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a full-circulation pump
In particular, the present invention relates to an all-circumferential flow type pump having a cyclone separator integrally provided on the suction side of the pump and having a solid-liquid separation function.

[0002]

2. Description of the Related Art Conventionally, there have been the following two methods for protecting a pump from slurry. (1) A strainer (or filter) is provided on the suction side of the pump to remove the slurry. That is, as shown in FIG.
A strainer 52 is provided on the suction side of the pump 51, and the solid particles are removed by the strainer 52 when the solid-liquid mixed liquid 53 is pressure-fed. (2) By devising the structure and material of the pump body, make the pump strong against the slurry liquid. That is, the pump body is made of a wear-resistant material and has a pump structure through which foreign matter can easily pass.

On the other hand, a cyclone separator which continuously separates a slurry in a liquid is conventionally known. Conventionally, as shown in FIG. 4, the cyclone separator 54 is used by being connected to the discharge port of the pump 51. The solid-liquid mixed liquid 53 is pumped by the pump 51 through the cyclone separator 54, the solid particles are separated by the cyclone separator 54 and discharged to the lower side, and the liquid from which the solid particles are removed is separated from above the cyclone separator 54. It is designed to be pumped. That is, the cyclone separator 54 is intended for solid-liquid separation itself, and the pump 5
The wear of No. 1 was not considered.

[0004]

The method (1) described above has a problem in that the strainer is clogged with the slurry and maintenance of the strainer is troublesome. Further, when the slurry itself is to be pressure-fed, there is a problem that the strainer becomes an obstacle and this system cannot be adopted.

On the other hand, in the above method (2), the pump main body is made of a wear resistant material, so that there is a problem that the cost is increased due to the use of the wear resistant material. In addition, there is a problem in that the structure of the pump is largely restricted because foreign matter is allowed to pass through.

Further, as described above, in the method of installing the cyclone separator for continuously separating the slurry in the liquid at the discharge port of the pump, the slurry liquid can be separated into solid and liquid, but the wear of the pump can be avoided. There was a problem that it could not be done.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a full-circulation pump capable of protecting the pump from wear and blockage.

[0008]

In order to achieve the above-mentioned object, an all-circumferential flow type pump of the present invention has a cylindrical casing for connecting a suction side casing, a discharge side casing and the suction side casing and the discharge side casing. An all-circumferential flow pump including a pump casing formed of an outer cylinder, a motor provided in the pump casing, and an impeller housed in at least one of the suction-side casing and the discharge-side casing, wherein the suction The side casing is integrally provided with a cyclone separator body including a cylindrical portion, a conical portion extending downward from the cylindrical portion, a suction port provided in the cylindrical portion, and a discharge port provided in the lower portion of the conical portion. An upstream ascending pipe extending below the suction port of the suction side casing is provided in the cyclone separator body.

[0009]

According to the present invention having the above-mentioned structure, the slurry liquid is sucked into the cyclone separator main body through the suction port, advances to the conical portion while rotating the portion near the wall of the cylindrical portion, and the particles in the liquid are centrifuged. It is collected by the force toward the peripheral wall portion, flows down along the conical surface, and continuously flows out downstream from the concentrated slurry discharge port. On the other hand, the liquid from which the particles have been separated rises in the rising vortex portion near the center and flows into the suction side casing of the pump through the upstream rising pipe, is pressurized by the pump and is discharged from the discharge port of the discharge side casing.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An all-circumferential flow type pump according to the present invention will be described below with reference to FIG. FIG. 1 is a sectional view showing an all-circumferential flow type pump of the present invention. The pump shown in the present embodiment includes a suction side casing 1, a discharge side casing 6, and an outer cylinder 9 connecting the suction side casing 1 and the discharge side casing 6. The suction-side casing 1, the outer cylinder 9, and the discharge-side casing 6 are each provided with a flange portion extending outwardly on the outer peripheral portion of the end portion on the opening side. Then, the suction side casing 1 and the outer cylinder 9 are integrally connected by the adjacent flange portions being sandwiched by flanges 20 and 20 made of cast iron or the like and tightened with bolts. Further, the discharge side casing 6 and the outer cylinder 9 are
Similarly, the adjacent flange portions 6a and 9b are sandwiched by the cast iron flanges 21 and 21 and fastened by bolts so that they are integrally connected.
Then, the suction side casing 1, the discharge side casing 6 and the outer cylinder 9 constitute a pump casing, and a canned motor 22 is arranged in the pump casing. Here, the suction side casing 1 and the discharge side casing 6 are each formed by deep drawing a steel plate such as stainless steel by pressing.

A cyclone separator body 2 having a cylindrical portion 2a and a conical portion 2b extending below the cylindrical portion 2a is integrally joined to the suction side casing 1 by welding. Further, the upstream rising pipe 3 is integrally joined to the suction port 1a of the suction side casing 1.

Further, in the cyclone separator body 2, a suction port 2c is opened in the cylindrical portion 2a, and a suction nozzle 4 having a suction flange 5 is provided in the suction port 2c. Then, a concentrated slurry discharge port 2d is opened at the lower end of the conical portion 2b. On the other hand, a discharge nozzle 7 having a discharge flange 8 is joined to the discharge port 6 a of the discharge side casing 6.

An inner casing 10 is provided inside the suction side casing 1, and a guide device 13 constituting a guide vane or volute is installed inside the inner casing 10. The guide device 13 has a spigot fitting portion, and the spigot fitting portion is fitted to the motor frame 23 of the canned motor 22. The motor frame 23 of the canned motor 22 has high rigidity, and the guide device 13 is supported by the motor frame 23. As a result, the inner casing 10 has the motor frame 23 of the canned motor 22 having high rigidity. Will be supported by. A seal member 14 is provided in the gap between the inner casing 10 and the suction side casing 1, and the suction side (low pressure side) and the discharge side (high pressure side) are sealed by the seal member 14.

An impeller 15 is housed inside the inner casing 10. The impeller 15 is a canned motor 22.
Is fixed and supported by the main shaft 16 of the. The motor frame 23 of the canned motor 22 is composed of a substantially cylindrical frame outer case 24 and frame side plates 25 and 26 provided at both side openings of the frame outer case 24. The frame outer case 24 has a plurality of ribs 24a formed radially on the outer peripheral portion thereof along the axial direction. The plurality of ribs 24a are formed on the outer frame 24 of the motor frame by press molding.
The ribs 24a are integrally formed with each other, and the outer surfaces of these ribs 24a are fitted to the inner circumferential surface of the outer cylinder 9 of the pump casing. .

A stator 27 and a rotor 28 are arranged in the motor frame 23. The rotor 28 is supported by the main shaft 16, and a cylindrical can 29 is fitted inside the stator 27. Also,
A radial bearing 30 is provided on the frame side plate 25, and the radial bearing 30 rotatably supports a shaft sleeve 31 fitted to the main shaft 16.

A bearing housing 32 is detachably mounted on the frame side plate 26. The bearing housing 32 includes a radial bearing 33 and a fixed thrust metal 34.
Respectively, and the radial bearing 33 has a main shaft 1
The shaft sleeve 35 fitted in 6 is rotatably supported. On the other hand, a thrust disc 36 is fixed to the end of the main shaft 16 on the discharge side.
Is provided with a rotating thrust metal 37 facing the fixed thrust metal 34.

An end plate 40 for pressing the bearing housing 32 is fixed to the frame side plate 26.
The end plate 40 is formed in a substantially conical shape along the streamline of the flow in the discharge side casing 6, and the fluid discharged from the impeller 15 is formed between the outer cylinder 9 and the motor frame outer case 24. After flowing into the discharge-side casing 5 through the formed flow path 50, it is rectified by the rectifying action of the end plate 40 and guided to the discharge port.

Next, the operation of the all-circumferential flow type pump constructed as described above will be explained. The slurry liquid sucked into the cyclone separator body 2 from the suction nozzle 4 advances to the conical portion 2b while rotating the portion near the wall of the cylindrical portion 2a,
The particles in the liquid are collected toward the peripheral wall by centrifugal force, flow down along the conical surface, and continuously flow out downstream from the concentrated slurry discharge port 2d. On the other hand, the liquid from which the particles have been separated rises in the rising vortex portion near the center and flows through the upstream rising pipe 3 into the suction side casing 1 of the pump. The fluid sucked into the suction side casing 1 is guided into the impeller 15 through the inner casing 10. The fluid discharged from the rotating impeller 15 is formed between the outer cylinder 9 and the motor frame outer shell 24 of the canned motor 22 after the flow direction is changed from the centrifugal direction to the axial direction through the guide device 13. Flow into the discharge side casing 6 through the flow path 50. Then, the fluid is rectified by the end plate 40 and then discharged from the discharge nozzle 7 formed integrally with the discharge side casing 6.

Therefore, according to this embodiment, the slurry liquid is separated by the cyclone separator integrally provided on the suction side of the pump, the concentrated slurry liquid is discharged from the cyclone separator to the outside, and only the clean liquid flows into the pump. To do. Therefore, it is possible to reduce the cost without using a special material or structure for protecting the pump from the slurry liquid. Further, according to the present embodiment, since the pump and the cyclone separator are integrally structured, the structure and shape are simple.

Next, another embodiment of the full-circulation pump according to the present invention will be described with reference to FIG. In FIG. 2, FIG.
Components having the same operation or function as those of the above-mentioned component are attached with the same notations and an explanation thereof will be omitted. The full-circulation pump shown in FIG. 2 is obtained by adding an ejector to the embodiment shown in FIG. That is, the ejector body 45 is attached to the discharge side casing 6.
Are integrally joined, and a discharge nozzle 46 is joined to the discharge port 6a of the discharge-side casing 6. A diffuser 47 is provided in the ejector body 45, and a discharge flange 48 is fixed to the diffuser 47.

A concentrated slurry suction port 45a is formed in the ejector body 45, and the concentrated slurry suction port 45a is connected to the concentrated slurry discharge port 2d by a bypass pipe 49.

According to the present embodiment, however, the slurry liquid is solid-liquid separated by the cyclone separator provided on the suction side of the pump, and the cleaning liquid is sucked into the pump from the casing 1 on the suction side and pressurized, It is discharged from the discharge nozzle 46 of the discharge side casing 6 to the slurry suction chamber 45b in the ejector body 45. At this time, the slurry suction chamber 4
Negative pressure is formed in 5b, and the concentrated slurry separated from the slurry liquid is sucked into the slurry suction chamber 45b from the concentrated slurry discharge port 2d through the bypass pipe 49 and mixed with the clean liquid in the slurry suction chamber 45b. And is discharged from the diffuser 47.

Therefore, according to the present embodiment, by combining the cyclone separator on the suction side of the pump and the ejector on the discharge side of the pump, the slurry liquid can be pressure-fed, and the slurry liquid does not flow into the pump. Instead, only the cleaning liquid flows in, so the pump can be protected from wear and blockage from the slurry liquid. Further, according to the present embodiment, since the pump, the cyclone separator and the ejector are integrated, the structure and shape are simplified.

[0024]

As described above, according to the present invention, since the slurry liquid does not flow into the pump, the pump can be protected from abrasion and blockage and the pump has a strong resistance to the slurry. Eliminates the use of abrasive materials. Moreover, according to the present invention, unlike pump protection using a strainer or the like, cleaning maintenance is unnecessary and continuous use can be endured.

Further, according to the present invention, the concentrated slurry separated by the cyclone separator can be pressure-fed by integrally providing the ejector on the discharge side of the pump.

Further, according to the present invention, since the pump casing and the cyclone separator are integrally structured, the structure and shape are simple. Furthermore, by integrating the ejector with the pump casing, the structure and shape are simplified.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an all-circumferential flow pump according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the all-circumferential flow pump according to the present invention.

FIG. 3 is an explanatory view showing a conventional pump.

FIG. 4 is an explanatory diagram showing a method of using a conventional cyclone separator.

[Explanation of symbols]

 1 Suction Side Casing 2 Cyclone Separator Main Body 3 Upstream Ascending Pipe 4 Suction Nozzle 5 Suction Flange 6 Discharge Side Casing 7 Discharge Nozzle 9 Outer Cylinder 10 Inner Casing 13 Guide Device 14 Sealing Member 15 Impeller 16 Spindle 22 Canned Motor 23 Motor Frame 24 Motor frame outer body 25, 26 Frame side plate 27 Stator 28 Rotor 32 Bearing housing 45 Ejector body 46 Discharge nozzle 47 Diffuser 48 Discharge flange 49 Bypass piping

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Isemoto 4-2-1 Motofujisawa, Fujisawa City, Kanagawa Prefecture EBARA Research Institute

Claims (2)

[Claims] 1. A pump casing comprising a suction side casing, a discharge side casing, a cylindrical outer cylinder connecting the suction side casing and the discharge side casing, a motor provided in the pump casing, and the suction side. A full-circulation pump including an impeller housed in at least one of a casing and a discharge-side casing, wherein the suction-side casing is provided with a cylindrical portion, a conical portion extending below the cylindrical portion, and the cylindrical portion. A cyclone separator body having a suction port and a discharge port provided in the lower part of the conical portion are integrally provided, and an upstream rising pipe extending below the suction port of the suction side casing is provided in the cyclone separator body. An all-circumferential flow type pump characterized by being provided. 2. The all-circumferential flow type pump according to claim 1, wherein the discharge side casing is integrally provided with an ejector which acts by a discharge flow from the discharge side casing.