JPH11210669A - Vertical type magnet pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vertical type magnet pump which prevents fluid from leaking out of a spindle part, and is free of the maintenance of a rotatably sealed part. SOLUTION: In a vertical type magnet pump 100 which permits a spindle 6 to start rotating due to the sucking action of two annular magnets 11 and 16 when the motor shaft 3a of an electric motor 3 is rotated, a plurality of slender back impeller blades 33 are fixed onto the upper surface of an impeller 7 in the radial direction, a filter removing impurities contained in lubricant is interposed between a first passage 34 communicating the inside of a bulkhead 12 with its outside and a pump discharge port, a small space 19 is formed in a space among the bulkhead 12, a radial bearing 13 and a spindle 6, and a second passage 17 communicating the small space 19 with the suction port 1a of a spiral casing 1, is provided for the bulkhead 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical magnet pump which does not damage a main shaft and a bearing even when a fine solid mixture is contained in a liquid.

[0002]

2. Description of the Related Art A conventional centrifugal pump requires a shaft seal to prevent leakage of lubricating liquid because a main shaft protrudes out of the machine for power transmission, and a mechanical seal is generally used. This mechanical seal also requires maintenance because the lubricant leaks as a result of wear. Therefore, if a magnet-driven pump having no shaft seal is used, for example, with permanent magnets or a combination of a permanent magnet and an electromagnet, liquid leakage can be eliminated, and maintenance on the shaft seal can be eliminated.

A conventional magnet pump 200 shown in FIG.
In this case, a part of the pumped liquid that has exited the impeller 51 reaches the bearing 52 on the side far from the impeller 51, and after lubricating the bearing 52, flows to the bearing 53 on the side near the impeller 51, and the bearing 53. After being lubricated, it flows out to the low pressure portion 56 near the impeller suction port 54. In such a structure, even if the liquid contains any slurry, the slurry damages the bearings 52 and 53.

Further, a magnet pump 20 having the structure shown in FIG.
0 indicates that when used as a vertical magnet pump, the air inside the partition wall 55 stays in the upper portion (right side in FIG. 4) inside the partition wall 55 and does not go outside, so the bearing 52 stays in the upper portion inside the partition wall 55. The liquid is not sufficiently lubricated due to exposure to the air, and seizure occurs early.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a vertical magnet pump which eliminates liquid leakage from a main shaft and does not require maintenance of a shaft seal.

[0006]

According to the present invention, an outer yoke is fixed to a lower end of a vertical motor shaft of a motor so as to be rotatable together with the motor shaft, and a spiral casing is integrally fixed to a lower portion of the motor. A partition made of a nonmagnetic material is fixed below the outer yoke between the electric motor and the spiral casing, and a radial thrust bearing integrally fixed to the spiral casing by a fixing member and integrally fixed to the partition. A main shaft provided with a flange is vertically supported by the radial bearing provided, and a first annular magnet is fixed to an outer edge of an inner yoke integrally fixed to the main shaft. A second annular magnet is fixed to the inner side of the outer yoke so as to face through the impeller, and an impeller is integrally formed with the main shaft below the fixing member. Are rolling capable secured, the motor shaft of the electric motor is rotated in the first, Vertical magnet pump in which the main shaft is rotated by the suction action of the second annular magnet,
A plurality of elongated back blades are radially fixed to the upper surface of the impeller, and a filter for removing impurities in the lubricating liquid is provided between the first passage and the pump discharge port that communicates inside and outside the partition provided in the partition. A small space is formed between the partition and the radial bearing and the main shaft, and a second passage communicating between the small space and a suction port of the spiral casing is provided in the partition. A vertical magnet pump characterized in that:

[0007]

FIG. 1 is a schematic vertical sectional front view of a vertical magnet pump 100 according to the present invention. The vertical magnet pump 100 includes a spiral casing 1, a base 2, an electric motor 3, a main shaft 6, an impeller 7, a partition 12, a filter case 18, and the like.

A radial thrust bearing 5 is fitted in a hole 4a provided in a metal plate 4 fitted in the spiral casing 1 as described later, with a flange 5a for supporting a thrust load on an upper side. After the radial thrust bearing 5 is fitted into the hole 4a, an annular upward thrust bearing 5b which receives upward thrust temporarily generated from the lower side of the metal plate 4 when the pump is started or the like is mounted on the radial thrust bearing 5b.
It is externally fitted to the lower part of the thrust bearing 5.

As shown in FIG. 1, a main shaft 6 provided with a flange 6a in the middle is inserted into a hole 5c of a radial thrust bearing 5 from above, and the flange 6a is brought into contact with the flange 5a. Project downward from the radial thrust bearing 5.

FIG. 2 shows a plan view of the radial thrust bearing 5. Flange 5a of radial thrust bearing 5
Are provided with horizontal grooves 35 at four locations in the radial direction. Further, a vertical groove 3 is provided at a communicating portion between the horizontal groove 35 and the hole 5c.
6 are provided. The vertical groove 36 extends along the main shaft 6, and the lubricating liquid passes through the vertical groove 36 via the horizontal groove 35, and a contact portion between the flange 6 a and the flange 5 a and between the radial thrust bearing 5 and the main shaft 6. Lubricate. A spiral groove may be formed instead of the vertical groove 36.

An impeller 7 is fitted to the lower end of the main shaft 6 protruding downward from the radial thrust bearing 5, and a nut 8 is screwed into a thread (not shown) provided at the lower end of the main shaft 6, and the impeller 7 is It does not deviate from 6. The impeller 7 and the main shaft 6 are integrally rotatably fixed by a key 31 (31 is a key fitted in a key groove in FIG. 1).

Elongated back blades 33 (FIG. 3) are fixed radially at eight locations on the upper surface of the impeller 7 in the circumferential direction. The upper part of the impeller 7 on the inner peripheral side of the portion where the back blade 33 is arranged is hereinafter referred to as a space 37. There is a gap between the impeller 7 and the radial thrust bearing 5 and the upward thrust bearing 5b, and the vertical groove 36 (FIG. 2) communicates with the space 37 through an annular passage 38.

As shown in FIG. 1, the main shaft 6 is passed through the hole 9a of the annular inner yoke 9, and the inner yoke 9 is mounted on the flange 6a. The key yoke (not shown) is aligned, and the key 10 is fitted so that the inner yoke 9 and the main shaft 6 can rotate integrally. An annular magnet 11 (first annular magnet) is externally fitted and fixed to the side outer periphery of the inner yoke 9.

As described above, the metal plate 4 provided with the main shaft 6 and the like is fitted into the spiral casing 1 and fixed integrally with bolts (not shown).

As shown in FIG. 1, a partition 12 having a bottomed, cylindrical space formed therein and a flange 12a extending outward in the radial direction at the outer edge of the opening is formed by a spiral casing 1 and a metal. It is fitted to the metal plate 4 from above the plate 4 with the flange 12a facing down while maintaining watertightness. A radial bearing 13 is fitted on the partition wall 12, and supports the upper end of the main shaft 6 via the radial bearing 13.

Although not shown, the radial bearing 13 is also provided with a groove corresponding to the vertical groove 36 of the radial thrust bearing 5 shown in FIG.
And the main shaft 6 can be lubricated.
As shown in FIG. 1, a small space 19 is formed above the main shaft 6 and the radial bearing 13 and partitioned by the partition wall 12, the main shaft 6, and the radial bearing 13.

The lower flange 2b of the cylindrical base 2 is placed on the flange 12a of the partition 12, and the base 2 is bolted by a bolt (not shown).
Are integrally fixed to the partition wall 12 and the spiral casing 1. Therefore, the lower flange 2b of the base 2 is placed on the spiral casing 1 via the flange 12a of the partition wall 12.
Are integrally fixed. Also, the upper flange 2 of the base 2
Since the electric motor 3 is mounted on the upper part a and is integrally fixed by bolts and nuts (not shown), the spiral casing 1 and the electric motor 3 are integrally fixed via the base 2 and the partition wall 12.

The lower end of the motor shaft 3a of the electric motor 3 passes through a hole at the center of the upper end of an outer yoke 15, and the outer yoke 15 is rotatable integrally with the motor shaft 3a by a key 14 (in FIG. 1, a key 14). The key 14 fitted in the groove is shown.) An annular magnet 16 (second annular magnet) is fixed to the outer yoke 15 so as to face the annular magnet 11 provided on the inner yoke 9 via the partition wall 12.

The flange 12a of the partition wall 12 is provided with a passage 34 (first passage) penetrating horizontally as viewed in FIG. In addition, a passage 17 (second passage) is provided in the partition wall 12 from the small space 19 to the outside in the radial direction of the flange 12a via the side portion and communicating with the outside from the side surface of the flange 12a.

The hole 22 communicating with the vicinity of the discharge port 1b of the spiral casing 1 and the passage 34 passing through the flange 12a of the partition wall 12 are connected by a pipe 41, a filter case 18 (to be described in detail later), and a pipe 23. Have been.

The lower end of a pipe 29 having an opening / closing valve 27 in the middle and an air vent cock 28 at the upper end is connected to the hole 24 communicating with the vicinity of the suction port 1a of the spiral casing 1. The right end of the pipe 30 is connected between the on-off valve 27 and the air vent cock 28 of the pipe 29, and the left end of the pipe 30 is connected to the passage 17 provided in the partition 12.

The filter case 18 is made of a transparent synthetic resin,
The filter 44 is made of plastic or the like.
Can be visually observed. As shown in FIG. 1, a magnet 32 is housed on a filter 44 in the filter case 18 to remove iron powder in the liquid. Magnet 3
A hole 32a is provided in a central portion of 2.

The filter case 18 has a lid 18a fixed with screws while maintaining watertightness with an O-ring (not shown).
By removing the lid 18a, the internal filter 44 can be replaced, and iron powder attached to the magnet 32 can be removed.

The lid 18a is provided with an air vent cock 40. A flow switch 39 is provided in the middle of the pipe 23 connecting the cover 18 a of the filter case 18 and the passage 34. The flow switch 39 operates when the flow of the liquid decreases, and transmits an alarm signal. By installing a pressure gauge in the filter case 18 so that the pressure of the liquid passing through the filter 44 can be measured, the degree of clogging of the filter 44 can be known from the degree of the pressure drop.

Next, the operation of the vertical magnet pump 100 will be described. Before operating the vertical magnet pump 100, priming is performed. 5 and 6 show the same vertical magnet pump 100 as FIG. In FIGS. 5 and 6, reference numeral 42 denotes a priming water funnel.

In the middle of the pipe 49 in FIG.
The filter case 18 is connected to the upper end of the pipe 49 as viewed in the direction of FIG. 6, and the lower end of the pipe 41 (FIG. 5) is similarly connected via an elbow 48. One end is connected. The other end of the pipe 41 is connected to the hole 22 of the spiral casing 1.

As shown in FIGS. 5 and 6, a pipe 45 is connected at right angles to a pipe 49 via a T-shaped joint 47. A valve 43 is provided in the middle of the pipe 45, and a water funnel 42 is connected to the left end of the pipe 45 through an elbow 60 and a pipe 61 as viewed in FIG.

Water can be supplied into the water funnel 42 by piping not shown. The water funnel 42 is disposed above the filter case 18 (FIG. 5) and the small space 19 (FIG. 1), and fills the inside of the partition wall 12 with water using a head difference.

First, the valves 43 and 46 shown in FIGS.
And water flows from the water funnel 42 into the spiral casing 1 through the hole 22 via the pipe 61, the pipe 45, the pipe 49, and the pipe 41. Eventually, the water fills the spiral casing 1, and when the water level exceeds the impeller 7, the valve 46 (FIG. 6) is closed. When the valve 46 is closed, water flows from the pipe 49 into the filter case 18 and flows into the chamber 20 from the passage 34 via the pipe 23 shown in FIGS. The water flowing into the chamber 20 rises in the annular passage 21 (FIG. 1) while pushing the air in the partition wall 12 upward.

The air pushed upward in the partition wall 12 reaches the small space 19 (FIG. 1), is pushed out by the rising water, and is pushed out from the air vent cock 28 through the pipe 30 and the pipe 29 through the passage 17. Released to the atmosphere. At this time, the valve 27 (FIG. 5) is closed,
8 (FIG. 5) is left open.

When water starts to flow out of the air release cock 28, all the air in the partition wall 12 is pushed out to the outside. At this time, the valve 27 is opened and the air release cock 28
Closes. With this, the priming is completed, and the vertical magnet pump 100 is in a drivable state.

When the electric motor 3 is driven to rotate the outer yoke 15, the main shaft 6 starts rotating integrally with the inner yoke 9 by the attraction of the annular magnets 16 and 11. Main shaft 6
The impeller 7, which is integrally fixed with the main shaft 6, also rotates together with the main shaft 6, so that the lubricating liquid flowing into the filter case 18 from the holes 22 (FIG. 1) is removed of impurities by the filter 44 and the magnet 32, and is introduced into the partition 12 from the passage 34. enter.

A portion of the lubricating liquid from the chamber 20 passes through the horizontal groove 35 (FIG. 2) and the vertical groove 36 (FIG. 2) formed in the flange 5a, and reaches the space 37 via the annular passage 38. During this time, the flange 6a of the main shaft 6 and the flange 5a of the radial thrust bearing 5 and the space between the radial thrust bearing 5 and the main shaft 6 are lubricated. The lubricating liquid that has reached the space 37 is scraped out by the back blade 33 (FIGS. 1 and 3), and flows into the spiral casing 1 from the outer peripheral side of the upper surface of the impeller rather than the back blade 33.

On the other hand, the lubricating liquid which has risen from the chamber 20 through the annular passage 21 reaches the small space 19 after lubricating the main shaft 6 and the radial bearing 13, and reaches the small space 19 from the passage 17 via the pipe 30.
To Here, the valve 27 is opened and the air release cock 2
When the valve 8 is closed, the lubricating liquid flows out of the hole 24 into the spiral casing 1.

As described above, the lubrication between the radial bearing 13 and the main shaft 6 and between the radial thrust bearing 5 and the main shaft 6 is performed, and the lubricating liquid after the lubrication is discharged from the discharge port 1b of the spiral casing 1.

[0036]

Before the operation of the electric motor 3, the priming water is applied to the partition wall 12.
As the air rises inside, the air inside the partition 12 is pushed out to the small space 19 formed above the radial bearing 13 and the main shaft 6, and the air is further released to the atmosphere from the air vent cock 28 through the passage 17, the pipes 30, 29. During the operation of the electric motor 3, the air does not remain in the partition 12 and is filled with water. Further, since there is no room for impurities other than the lubricating liquid to enter the partition 12, the space between the radial bearing 13 and the main shaft 6 is lubricated. Since the lubrication can be sufficiently performed by the liquid and the cooling effect can be exerted, seizure as in the related art can be prevented, and safety can be ensured.

When the impeller 7 rotates, not only the lubricating liquid is discharged to the outer peripheral direction of the impeller 7 due to the centrifugal force, but also the lubricating liquid is scraped out by the back blade 33, so that the discharge of the lubricating liquid further proceeds. Thus, a negative pressure is easily generated in the space 37, and the downward thrust of the impeller 7 can be reduced.

Since the filter 44 is provided, the slurry contained in the lubricating liquid is removed, and clean lubricating liquid is supplied between the radial thrust bearing 5 and the main shaft 6 and between the radial bearing 13 and the main shaft 6.
Therefore, the radial thrust bearing 5, the radial bearing 13, and the main shaft 6 are not damaged.

By providing the back blade 33 on the upper surface of the impeller 7, the lubricating liquid is scraped out, so that the intrusion (reverse flow) of the slurry-containing liquid from the outer edge of the impeller 7 can be reliably prevented.

The differential pressure required for lubricating the lubricating liquid can be sufficiently ensured. That is, the hole 22 near the discharge port 1b represents the discharge pressure, and the hole 24 near the suction port 1a.
Represents the suction pressure, and the space between the holes 22 and 24 corresponds to the total head of the pressure. Therefore, it can sufficiently overcome the resistance when passing through the filter 44, the narrow horizontal groove 35, and the vertical groove 36, and can exert a lubricating action and a cooling action with a clean lubricating liquid.

The occupation area is smaller than that of the conventional horizontal magnet pump, and sufficient space saving can be achieved while achieving sufficient lubrication and cooling of the bearing portion.

[Brief description of the drawings]

FIG. 1 is a schematic vertical front view of a vertical magnet pump to which the present invention is applied.

FIG. 2 is a plan view of a radial thrust bearing.

FIG. 3 is a plan view of an impeller having a back blade fixed to an upper surface.

FIG. 4 is a schematic longitudinal sectional front view of a conventional horizontal magnet pump.

FIG. 5 is a front view of a vertical magnet pump to which the present invention is applied.

FIG. 6 is a plan view of a vertical magnet pump to which the present invention is applied.

[Description of Signs] 1 Spiral casing 1a Suction port 1b Pump discharge port 3 Electric motor 3a Motor shaft 4 Metal plate 5 Radial thrust bearing 6 Main shaft 6a Flange 7 Impeller 11 Ring magnet (first annular magnet) 12 Partition 13 Radial bearing Reference Signs List 15 outer yoke 16 annular magnet (second annular magnet) 17 passage (second passage) 18 filter case 19 small space 33 back blade 34 passage (first passage) 100 vertical magnet pump

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshinori Inoue 4-1-1-13 Honcho, Chuo-ku, Osaka-shi, Osaka Inside the Osaka main store of Takenaka Corporation (72) Inventor Nozomi Kusumoto 4 No.1-113, Takenaka Corporation Osaka Main Store (72) Inventor ▲ Yoshi ▼ Take Yuji 4-1-1-13, Honcho, Chuo-ku, Osaka-shi, Osaka-shi Takenaka Corporation Osaka Main Store

Claims (1)

[Claims] An outer yoke is fixed to a lower end of a vertical motor shaft of the electric motor so as to be rotatable together with the motor shaft.
A spiral casing is integrally fixed to a lower portion of the electric motor, and a partition made of a nonmagnetic material is fixed below the outer yoke between the electric motor and the spiral casing, and a fixing member is fixed to the spiral casing. A main shaft provided with a flange is vertically supported by a radial thrust bearing integrally fixed and a radial bearing integrally fixed to the partition, and a first annular magnet is provided on an outer edge of an inner yoke integrally fixed to the main shaft. Fixed to the first
A second annular magnet is fixed inside the outer yoke so as to face the annular magnet via the partition, and an impeller is fixed below the fixing member so as to be rotatable integrally with the main shaft. In the vertical magnet pump in which the main shaft rotates by the attraction of the first and second annular magnets when the motor shaft rotates, a plurality of elongated back blades are radially fixed to the upper surface of the impeller, and the lubricating liquid A filter for removing impurities in the partition is provided between a first passage communicating with the inside and outside of the partition provided in the partition and a pump discharge port, and a small space is formed between the partition and the radial bearing and the main shaft. And a second passage for communicating between the small space and a suction port of the spiral casing is provided in the partition wall.