JPH0968187A - Canned motor pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a canned motor pump whose bearing can be easily disassembled even without using a particular disassembling tool. SOLUTION: In a canned motor pump provided with a pump part having an impeller 22 mounted in a shaft body 23 and a motor part juxtaposed with the pump part to arrange bearings 53, 54 journalling the shaft body 23 in a partition of the motor part, the canned motor pump is formed by providing a bearing pressing out structural part extruding the bearings 53, 54 to an axial direction in the partition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a canned motor pump, and more particularly to a canned motor pump having a structure that facilitates disassembly of a bearing.

[0002]

2. Description of the Related Art FIG. 8 is a diagram showing the structure of a conventional canned motor pump of this type. In FIG. 8, reference numeral 5 is a pump casing, and an impeller 22 is arranged in the pump casing 5. The opening of the pump casing 5 is covered with a casing cover 20. Code 5
Reference numeral 3 denotes a bearing on the impeller side, which is attached to the inner periphery of the casing cover 20, and bearing 54 on the side opposite to the impeller is the end cover 1
It is attached to the inner circumference of 7. Between the outer peripheral surfaces of the bearings 53, 54 and the inner peripheral surfaces of the bearing mounting surfaces of the casing cover 20 and the end cover 17, in order to minimize the eccentricity between the rotating body and the fixed side in the assembled state, the bearings are installed. There is only a very small gap that can be installed.

Reference numeral 59 is a distance piece, and the distance piece 59 is fitted into the rotor 23,
The thrust plate 57, the shaft sleeve 55, and the impeller 22 are fixed together by bolts at the end of the rotor. Similarly, the thrust plate 58 and the shaft sleeve 56 on the side opposite to the impeller are fitted into the rotor 23 and fixed by bolts at the rotor end.

A space 1 is provided between the rotor 24 and the impeller-side bearing 53, a space 2 is provided between the rotor 24 and the non-impeller-side bearing 54, and an end cover 17 and an anti-impeller-side bearing 54 are provided. And the space 13 between the impeller-side bearing 53 and the impeller 22. Impeller side bearing 53
And the sleeve 55, the flow path B, the end face of the impeller-side bearing 53 and the thrust plate 57, the flow path C, the stator can 60 and the rotor can 61, and the counter impeller side bearing. The end face of 54 and the thrust plate 58 form the flow path E and the bearing 5 on the side opposite to the impeller.
4 and the shaft sleeve 56 constitute flow passages.

In this type of canned motor pump, FIG.
As shown in FIG. 3, cooling of the motor and the bearing and lubrication of the bearing have been performed by guiding a part of the pressurized liquid from the discharge portion of the pump casing 5 to the space 3 through the external pipe 14. An orifice 6 for maintaining an appropriate amount of circulating liquid is arranged in the middle of the external pipe 14. A part of the pressurized liquid taken out from the discharge part enters the space 3 via the external pipe 14 and the orifice 6, and from this space 3, the flow path C, the flow path E, the space 2, the flow path D, space 1,
Pass through flow path c and flow path a, enter space 13, and then impeller 2
It passes through the second balance hole 22a and returns to the suction side of the pump. This path cools the motor and the bearing and lubricates the bearing.

Carbon is generally used as the material of the bearing,
The material of the shaft sleeve that slides on the bearing is generally stainless steel whose surface is hard plated or sprayed. The bearing must be replaced if the inner peripheral surface of the bearing and the end surface that slides on the thrust plate wear out as the operating time elapses, and each reaches a certain allowable value. In addition, when inspecting the wear condition of the bearing, the bearing may be removed and inspected, and then the bearing may be incorporated and used again.

[0007]

However, in the canned motor pump shown in FIG. 8 having the above-mentioned conventional structure, the bearing 53 is replaced when the worn bearing is replaced or when the worn state of the bearing is inspected. Removing 54 and 54 is often very difficult.

The reason for this is considered as follows. (1) The gap between the outer diameters of the bearings 53 and 54 and the inner diameters of the bearing mounting surfaces of the casing cover 20 and the end cover 17 is very small in the first place. (2) Since the bearings 53 and 54 are constantly in contact with the circulating fluid that cools the motor and the bearings and lubricates the bearings during operation of the canned motor pump, scales and impurities of the circulating fluid accumulate. (3) The bearings 53 and 54 and the casing cover 20 are small even by the load received from the canned motor pump.
And the end cover 17 is deformed.

When the bearing is removed, even if the bearing is destroyed by a hammer or the like to be removed, the casing cover 2
0 and the inner circumference of the end cover 17 limits the outward spreading of the bearing, which is quite difficult.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a canned motor pump capable of easily disassembling a bearing without using a special disassembling tool.

[0011]

According to a first aspect of the present invention, there is provided a pump section having an impeller attached to a shaft body, and a motor section attached to the pump section. A canned motor pump in which a bearing for axially supporting the shaft is arranged, wherein a bearing pushing structure portion for pushing the bearing in the axial direction is provided in the partition wall. As a result, the bearing is pushed out by operating the push-out structure portion after the motor is disassembled.

The invention according to claim 2 is the canned motor pump according to claim 1, wherein the bearing pushing structure portion is a mounting portion for mounting a pushing member. By attaching the push-out structure portion to the attachment portion after the motor is disassembled, the push-out structure portion can be operated smoothly. The invention according to claim 3 is
The canned motor pump according to claim 1 or 2, wherein the pushing member is a bolt, and the mounting portion is a screw hole. After disassembling the motor,
The bearing is pushed out by attaching a bolt to the screw hole and tightening it.

The invention according to claim 4 is the canned motor pump according to claim 3, wherein a plug for closing the screw hole is detachably attached to one end of the screw hole. . When the pump is running,
The plug prevents fluid from entering the screw holes. The invention according to claim 5 is the canned motor pump according to claim 3 or 4, wherein a spacer is arranged between the bearing and the screw hole. When the bearing is pushed out, it is prevented that the bearing is damaged by the tip of the screw. In the invention according to claim 6, the partition wall is
The canned motor pump according to claim 1, wherein the canned motor pump is a partition wall between the motor unit and the pump unit.

The invention according to claim 7 is the canned motor pump according to any one of claims 1 to 5, wherein the partition wall is a partition wall between the motor section and the external space. The invention according to claim 8 is characterized in that the partition wall is both a partition wall between the motor unit and the pump unit and a partition wall between the motor unit and the external space.
The canned motor pump according to any one of 1.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing the structure of a canned motor pump of the present invention. Portions given the same reference numerals as in FIG. 8 indicate the same or corresponding portions.

The impeller side bearing 53 and the casing cover 2
The spacer 31 is disposed between the end bearing 17 and the bearing 54 on the side opposite to the impeller, and the spacer 32 is disposed between the end bearing 17 and the end cover 17. Two or more screw holes 33 are provided on the contact surface of the spacer 31 of the casing cover 20 in the axial direction, and a gas screw 33a for attaching the plug 35 is provided concentrically with the screw hole 33. Similarly, the spacer 32 of the end cover 17 is provided.
On the contact surface, two or more screw holes 34 are provided in the axial direction, and a gas screw 34a for mounting a plug 36 concentrically with the screw hole 34 is provided.

In the canned motor pump having the above structure, the plugs 35 and 36 are attached for the purpose of protecting the screw holes 33 and 34 from corrosion by the circulating fluid.
The spacers 31 and 32 are arranged to facilitate pushing of the bearings 53 and 54 and to prevent the bearings 53 and 54 from being damaged. Other configurations are similar to those of the canned motor pump shown in FIG.

When disassembling the bearings 53 and 54, the canned motor pump is first disassembled and the casing cover 20 is disassembled.
And the end cover 17 are removed. At this time,
The bearings 53 and 54 and the spacers 31 and 32 are respectively
It is integrated with the casing cover 20 and the end cover 17.

Next, the plug 35 of the gas screw 33a is removed from the other surface side of the casing cover 20, and the push bolt 37 is screwed into the screw hole 33 as shown in FIG. As a result, as shown in FIG. 3, the impeller-side bearing 53 pushes out the spacer 31 integrally and is removed. As shown in FIGS. 5 to 7, the bearing 54 and the spacer 32 on the side opposite to the impeller can be integrally removed from the end cover 17 in exactly the same manner.

[0020]

As described above, the present invention has the pump portion having the impeller attached to the shaft body, and the motor portion provided side by side with the pump portion, and the shaft body is provided on the partition wall of the motor portion. In the canned motor pump in which the bearing supporting the shaft is arranged, the canned motor pump is characterized in that a bearing extruding structure portion for extruding the bearing in the axial direction is provided on the partition wall. By operating the structure portion, the bearing is extruded, and the excellent effect that the bearing can be easily disassembled without using a special disassembling tool is obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a canned motor pump of the present invention.

FIG. 2 is a cross-sectional view of an embodiment showing a state in which a bearing on the impeller side and a spacer are integrally removed from the casing cover of the canned motor pump of the present invention.

FIG. 3 is a cross-sectional view of an embodiment showing the process of removing the impeller-side bearing and spacer of the canned motor pump of the present invention with a push bolt.

FIG. 4 is a side view of the canned motor pump of the present invention seen from the push bolt side in FIGS. 2 and 3.

FIG. 5 is a cross-sectional view of an embodiment showing a state in which the bearing and spacer on the side opposite to the impeller are integrally removed from the end cover of the canned motor pump of the present invention.

FIG. 6 is a cross-sectional view of an embodiment showing the process of removing the bearing and spacer on the side opposite to the impeller of the canned motor pump of the present invention with a push bolt.

FIG. 7 is a side view of the canned motor pump of the present invention seen from the push bolt side in FIGS. 5 and 6.

FIG. 8 is a sectional view showing a conventional canned motor pump of this type.

[Explanation of symbols]

 5 Pump Casing 17 End Cover 20 Casing Cover 22 Impeller 23 Rotor (Shaft) 24 Rotor 25 Stator 31, 32 Spacer 33, 34 Screw Hole 33a, 34a Gas Screw 35, 36 Plug 37, 38 Push Bolt 53, 54 Bearing

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomotoshi Hirata 4-2-1 Motofujisawa, Fujisawa City, Kanagawa Prefecture Ebara Research Institute Ltd. (72) Inventor Toshiya Akasaka 4-chome, Fujisawa City, Kanagawa Prefecture 1- 1 Ebara Densan Co., Ltd. (72) Inventor Atsushi Oyama 4-1-1 Motofujisawa, Fujisawa City, Kanagawa Prefecture Ebara Densan Co., Ltd.

Claims (8)

[Claims] 1. A canned motor having a pump section having an impeller attached to a shaft body, and a motor section provided side by side with the pump section, wherein a bearing for pivotally supporting the shaft body is arranged on a partition wall of the motor section. In the pump, a canned motor pump characterized in that the partition wall is provided with a bearing push-out structure portion for pushing the bearing in the axial direction. 2. The bearing pushing structure portion is a mounting portion to which a pushing member is attached.
The canned motor pump described in. 3. The pushing member is a bolt, and the mounting portion is a screw hole.
The canned motor pump described in. 4. The canned motor pump according to claim 3, wherein a plug for closing the screw hole is detachably attached to one end of the screw hole. 5. The canned motor pump according to claim 3, wherein a spacer is arranged between the bearing and the screw hole. 6. The canned motor pump according to claim 1, wherein the partition wall is a partition wall between the motor unit and the pump unit. 7. The canned motor pump according to claim 1, wherein the partition wall is a partition wall between the motor unit and the external space. 8. The canned motor according to claim 1, wherein the partition wall is both a partition wall between the motor unit and the pump unit and a partition wall between the motor unit and the external space. pump.