JPH05340428A - Radial bearing unit and canned motor equipped therewith - Google Patents

Abstract

PURPOSE:To provide a radial bearing unit that is able to do the whirl-stop of a radial bearing so easily, and also to prevent any impact load from being added to this radial bearing as well as to provide a canned motor that is equipped with this radial bearing unit. CONSTITUTION:A radial bearing unit 30 equipped with an almost cylindrical radial bearing unit 51 consisting of ceramics and a bearing housing 52 holding this radial bearing is provided with a notch 51b installed in circumferential part of the radial bearing 51 in a direction almost orthogonal with the axial direction; a groove 52b installed in an inner circumferential part of the bearing housing 52 along the axial direction; and a key member 53 consisting of an elastic material for serving as a whirl-stop of the radial bearing is interposed between the groove 52b and the notch 51b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radial bearing device and a canned motor having the radial bearing device, and more particularly to a radial bearing device for rotatably supporting a rotor of the canned motor and a canned device having the radial bearing device. Regarding motors.

[0002]

2. Description of the Related Art A canned motor pump circulates a handled liquid by itself and lubricates a bearing and cools a motor by the treated liquid. The canned motor generally includes two radial bearings that support the rotor on both sides and two thrust bearings that support thrust loads in both axial directions on the load side and the anti-load side. Generally, ceramics have high hardness, and complicated processing is difficult. In addition, since homogeneity is required when forming the material, it is desirable that the shape is as simple as possible. Therefore, when ceramics are used for radial bearings, it is necessary to make the detent structure as simple as possible.

However, conventional ceramic radial bearings have been fixed to the bearing housing with an adhesive, or fixed to the bearing housing by press fitting.

[0004]

As described above, when an adhesive is used to fix the radial bearing made of ceramics to the bearing housing, the radial bearing is rotated with respect to the bearing housing due to peeling of the adhesive or the like. There was a problem that it might happen.

On the other hand, when the radial bearing is press-fitted into the bearing housing, the fitting becomes loose due to temperature change and the like,
Similarly, there is a problem that the radial bearing rotates with respect to the bearing housing.

The present invention has been made in view of the above circumstances, and its object is to prevent the radial bearing from rotating easily and to prevent the radial bearing from receiving an impact load at the time of starting. The object is to provide a device and a canned motor including the radial bearing device.

[0007]

In order to achieve the above-mentioned object, a radial bearing device of the present invention comprises a radial bearing made of ceramics and having a substantially cylindrical shape, and a bearing housing for holding the radial bearing. In the outer peripheral portion of the radial bearing, a notch portion is provided in a direction substantially orthogonal to the axial direction, a groove is provided in the inner peripheral portion of the bearing housing along the axial direction, and between the groove and the notch portion. In addition, a key member made of an elastic material for preventing the radial bearing from rotating is interposed.

The canned motor of the present invention includes a stator provided in a closed chamber formed by a motor frame and a can, a rotor arranged concentrically with the stator, and the rotor. The radial bearing device according to claim 1, which is rotatably supported, is provided.

[0009]

According to the present invention having the above-mentioned structure, the key member made of an elastic material interposed between the bearing housing and the radial bearing serves to prevent the radial bearing from rotating and to prevent an impact force applied at the time of starting. It is possible to protect radial bearings made of ceramics that absorb and are weak against impact. Since the key member is an elastic body, the dimensional accuracy of the other party (that is, the radial bearing) may be the same as when the material is molded, and processing is unnecessary. Therefore, it is an effective anti-rotation means for a ceramic radial bearing that is hard and difficult to process. Further, since the non-notched portion left on the outer peripheral end of the radial bearing engages with the key member, the key member can be prevented from falling off.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a radial bearing device according to the present invention and a canned motor equipped with the radial bearing device will be described below with reference to FIGS. FIG. 1 is a sectional view showing an all-circumferential type in-line pump. The in-line pump according to the present embodiment includes a suction side casing 1, a discharge side casing 5, and an outer cylinder 9 that connects the suction side casing 1 and the discharge side casing 5. The suction-side casing 1, the outer cylinder 9, and the discharge-side casing 5 are each provided with a flange portion 1 extending outwardly on the outer peripheral portion of the end portion on the opening side.
a, 9a, 9b, 5a. Then, the suction side casing 1 and the outer cylinder 9 are clamped by the flanges 20 and 20 made of cast iron or the like and the bolts 45 are tightened by the flange portions 1a and 9a adjacent to each other.
Connected together. Similarly, the discharge-side casing 5 and the outer cylinder 9 are integrally connected by sandwiching the adjacent flange portions 5a and 9b by the flanges 21 and 21 made of cast iron such as cast iron and tightening them by the bolts 45. Has been done. The suction side casing 1, the discharge side casing 5 and the outer cylinder 9 constitute a pump casing, and the canned motor 2 is provided in the pump casing.
2 are provided.

The suction side casing 1 is provided with a main body portion 2 on a truncated cone and a suction nozzle 3 extending from the main body portion 2 to the suction side. Further, the discharge-side casing 5 is also similar to the suction-side casing 1 in that it has a truncated cone-shaped main body portion 6.
And a discharge nozzle 7 extending from the main body 6 to the suction side
It has and.

On the other hand, an inner casing 10 is provided inside the suction side casing 1.
Is composed of a container-shaped main body portion 11 and a cylindrical suction side portion 12 extending from the main body portion 11 to the suction side, and an O-ring is provided between the main body portion 11 and the suction side portion 12. A seal member 18 made of an elastic material such as is interposed. A guide device 13 that constitutes a guide vane or volute is installed inside the main body 11 of 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.
One end of the suction side portion 12 of the inner casing 10 extends to the vicinity of the suction nozzle 3. A seal member 14 is interposed in the gap between the end of the suction side portion 12 of the inner casing 10 and the suction nozzle 3 of the suction side casing 1. The seal member 14 allows the suction side (low pressure side) and the discharge side. The side (high pressure side) is sealed.

An impeller 15 is housed inside the inner casing 10. The impeller 15 is a canned motor 22.
Is fixed and supported on the main shaft 16 of the. In addition, the suction nozzle 3 and the discharge nozzle 7 have intermediate rings 46,
A suction flange 48 and a discharge flange 49 are fixed via 46.

The motor frame 23 of the canned motor 22 has a substantially cylindrical frame outer case 24, and frame side plates 25 and 2 provided on both side openings of the frame outer case 24.
6 and 6. The outer shell 24 of the frame 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 integrally with the motor frame outer case 24 by press molding, and the outer surfaces of these ribs 24a are fitted to the inner peripheral surface of the outer cylinder 9 of the pump casing, and this fitting is performed. In the part, both are joined and integrated by spot welding or the like.

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 device 30 is provided on the frame side plate 25, and the radial bearing device 30 rotatably supports a shaft sleeve 31 fitted to the main shaft 16.

As shown in FIGS. 2 and 3, the radial bearing device 30 is provided with a substantially cylindrical radial bearing 51 made of ceramics and a bearing housing 52 for holding the radial bearing 51. Radial bearing 51
A notch 51b is formed in the outer peripheral portion 51a in a direction substantially orthogonal to the axial direction. On the other hand, a groove 52b is formed along the axial direction in the inner peripheral portion 52a of the bearing housing 52 into which the radial bearing 51 is fitted, and the groove 52b is formed.
A key member 53 made of an elastic material for preventing the radial bearing 51 from rotating is interposed between the notch portion 51b and the cutout portion 51b. Since the non-notched portion 51c left on the outer peripheral end of the radial bearing 51 engages with the key member 53, the key member 53
It has become possible to prevent the fall of.

A bearing housing 32 is removably provided on the frame side plate 26. The bearing housing 32 holds a radial bearing 33 and a fixed thrust metal 34, respectively. A shaft sleeve 35 fitted to the main shaft 16 is rotatably supported. The bearing housing 32 and the radial bearing 33 constitute a radial bearing device, and the structure thereof is the same as that of the radial bearing device 30 shown in FIGS. 2 and 3. On the other hand, a thrust disk 36 is fixed to the end of the main shaft 16 on the discharge side, and the thrust disk 36 includes a rotating thrust metal 37 that faces the fixed thrust metal 34.

An end plate 40 constituting a filter is fixed to the frame side plate 26. The end plate 40 has a straightening portion 41 protruding in a substantially hemispherical shape, and a plurality of slits 42 extending radially inward from the inner side in the straightening portion 41 in the straightening portion 41.
Are formed. The rectifying portion 41 of the end plate 40 is formed in a substantially hemispherical shape along the streamline of the flow in the discharge-side casing 5, and the fluid discharged from the impeller 15 is used for the outer cylinder 9 and the motor frame outer shell. After flowing into the discharge-side casing 5 through the flow path 50 formed between 24, the rectifying section 41
Is rectified by the rectifying action of and is guided to the discharge port. In addition, since the slits 42 are radially formed in the rectifying unit 41, the slits 42 function as a filter, and when the fluid flows into the canned motor 22 through the slits 42, foreign matter in the fluid is captured by the slits 42. And removed. Since the slit 42 is formed along the flow direction, the foreign matter once trapped in the slit 42 is pushed and moved in the flow direction by the flow velocity, is removed from the slit 42, and the slit 42 is clogged. Is prevented. That is, the slit 42 has a self-cleaning action depending on its shape. The end plate 40 also serves as a holding plate for fixing the bearing housing 32 to the frame side plate 26.

The operation of the inline pump will be briefly described. The fluid sucked from the suction nozzle 3 is guided into the impeller 15 through the suction side portion 12 of the inner casing 10. The fluid discharged from the rotating impeller 15 is formed between the outer cylinder 9 and the motor frame outer case 24 of the canned motor 22 after the flow direction is changed from the centrifugal direction to the axial direction via the guide device 13. Flows into the discharge side casing 5 through the flow path 50. Then, the fluid is rectified by the rectifying portion 41 of the end plate 40, and then discharged from the discharge nozzle 7 formed integrally with the discharge-side casing 5.

On the other hand, since a gap is formed between the main plate 15a of the impeller 15 and the motor frame side plate 25,
The rotation of the impeller 15 causes disc friction in this gap, and a pressure reducing effect is produced in this gap. Therefore, the end plate 40
The fluid that has flowed into the canned motor 22 through the slit 42 of the frame passes through the opening 32a of the bearing housing 32 as shown by the arrow, and further passes through the gap between the rotor 28 and the can 29 of the stator 27, and the opening 25a of the frame side plate 25. A circulation path that flows out to the back side of the main plate 15a of the impeller 15 is formed. The bearing is lubricated and the motor is cooled during the circulation of the handled liquid in the canned motor 22.

[0021]

As described above, according to the present invention, the key member made of an elastic material interposed between the bearing housing and the radial bearing serves to prevent the radial bearing from rotating and to give a shock applied at the time of starting. It is possible to protect a radial bearing made of ceramics that absorbs force and is weak against impact.

Further, according to the present invention, since the key member is an elastic body, the dimensional accuracy of the mating member (that is, the radial bearing) can be the same as that at the time of forming the material, and processing is unnecessary. Therefore, it is an effective anti-rotation means for a ceramic radial bearing that is hard and difficult to process. Further, since the non-notched portion left on the outer peripheral end of the radial bearing engages with the key member, the key member can be prevented from falling off.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a radial bearing device and a canned motor equipped with the radial bearing device according to the present invention.

FIG. 2 is a view showing a radial bearing device according to the present invention, FIG. 2 (a) is a sectional view thereof, and FIG. 2 (b) is a side view thereof.

FIG. 3 is a perspective view showing a radial bearing in the radial bearing device according to the present invention.

[Explanation of symbols]

 1 Suction Side Casing 3 Suction Nozzle 5 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 30 Radial bearing device 32 Bearing housing 40 End plate 51 Radial bearing 52 Bearing housing 53 Key member

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[Procedure amendment]

[Submission date] July 12, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

[0007]

In order to achieve the above object, a radial bearing device of the present invention is provided with a substantially cylindrical radial bearing made of ceramics and a bearing housing for holding the radial bearing. , Leaving both axial ends on the outer periphery of the radial bearing.
A notch portion, a groove having an opening on the bearing insertion side is provided along the axial direction in the inner peripheral portion of the bearing housing, and the radial bearing is prevented from rotating between the groove and the notch portion. It is characterized in that a key member made of an elastic material is interposed.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H02K 5/167 7254-5H

Claims (2)

[Claims] 1. A radial bearing device comprising a substantially cylindrical radial bearing made of ceramics and a bearing housing for holding the radial bearing, wherein a notch is formed in an outer peripheral portion of the radial bearing in a direction substantially orthogonal to the axial direction. A groove is provided along the axial direction on the inner peripheral portion of the bearing housing, and a key member made of an elastic material for preventing rotation of the radial bearing is interposed between the groove and the notch. A radial bearing device characterized by being mounted. 2. A stator provided in a closed chamber formed by a motor frame and a can, a rotor arranged concentrically with the stator, and the rotor being rotatably supported. And a radial bearing device.