JPH10311293A - Canned motor pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent sliding abrasion of a contact surface of a bearing end part or a thrust receiving member by forming a passage to communicate with an opposed slide surface with the thrust receiving member composed of an annular ceramic plate of a separate member in a bearing member on the side to receive thrust to pivot a rotor, and arranging plural inclined grooves in the thrust receiving member. SOLUTION: In a bearing 9 on the pump chamber side to receive thrust to pivot a rotor, a groove 9-1 extending in the shaft direction is formed on a sliding inner peripheral surface with a shaft 7-12 in the shape of reaching a contact sliding surface with a thrust receiving member 10 composed of an annular ceramic plate of a separate member, and is communicated with a surface of the thrust receiving member 10 to come into contact with the bearing 9. Plural inclined grooves 10-1 whose outer peripheral side is closed and inner peripheral side is opened on a bearing member opposed sliding surface and which are communicated with a passage, are formed on the contact surface of the thrust receiving member 10. By being constituted in this way, a lubricating film is formed between both by the lubricant sucking-in action by relative rotation by the groove 9-1 extending in the shaft direction of the bearing 9 and the inclined grooves 10-1 of the thrust receiving member 10 communicated with the groove 9-1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improving the life of a canned motor pump, and more particularly to improving the reliability of a bearing for supporting a rotor.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view of a canned motor pump according to the prior art. Although not described in detail, a rotor chamber 5 and a rotor 7 provided inside a pump chamber 6 communicating with the rotor chamber 5 are shown. -2 and the impeller 8 integrated with the rotor 7-2,
It is rotatably supported by shafts 7-21 by bearings 9 provided at both ends. FIG. 5 is an enlarged partial view showing the bearing 9, the thrust receiving member 10 and the shaft 7-21 in the example of FIG. 4, and FIG. 6 is a front view showing a sliding contact surface of the thrust receiving member 10.

With the operation of the pump, the rotor 7-2 rotates and the thrust is applied to the rotor 7-2 by the pumping load of the impeller 8. In this example, the thrust acts on the pump chamber side. A thrust receiving member 10 is provided so as to be in sliding contact with the end face of the pump chamber side bearing 9. The thrust receiving member 10 may be made of a ceramic material or the like as a hard material in consideration of durability against sliding contact wear. The thrust receiving during operation depends on the sliding contact between the bearing member and the thrust receiving member 10, but the lubrication of the sliding contact surface depends on the lubricating function of the bearing member. Wear will be affected. It is preferable that the sliding contact surface is arranged with good surface roughness.

[0004]

In the conventional structure as described above, the sliding wear of the bearing end or the contact surface of the thrust receiving member due to the thrust of the rotor during the turning operation of the impeller still causes a bottleneck in the product life. As a matter of fact, further improvement was expected.

[0005]

The canned motor pump according to the present invention extends axially on or near an inner peripheral surface which is in sliding contact with the shaft on a bearing member which receives a thrust for supporting the rotor. A passage communicating with a sliding contact facing surface with a thrust receiving member disposed in contact with the bearing member is formed, and the thrust receiving member is provided as a separate member made of an annular ceramic plate, and is provided with the bearing member. The outer peripheral side is closed on the contact surface, and the inner peripheral side is configured such that a plurality of inclined grooves communicating with the passage opening to the bearing member sliding contact opposing surface are formed.

[0006] In the above-described configuration, the sliding end wear of the bearing end or the contact surface of the thrust receiving member due to the thrust of the rotor during the turning operation of the impeller is prevented, thereby improving the product life and improving the reliability. Has the effect of doing

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention. As shown in a partially enlarged view of FIG. The groove 9-1 extending in the direction is formed so as to reach the sliding surface in contact with the thrust receiving member 10, and communicates with the surface of the thrust receiving member 10 in contact with the bearing 9, so that the thrust receiving member 10 A plurality of inclined radial recesses 1 as illustrated in FIG.
0-1 is formed.

A hydrodynamic bearing for forming a lubricating film by self-pressing by a rolling operation is well known and will not be described in detail. However, a groove 9-1 extending in the axial direction of the bearing 9 according to the present invention is provided. Thrust receiving member 10 communicating with the groove 9-1
The inclined groove 10-1 forms a lubricating film between the two by a lubricant suction action by relative rotation.

The groove 9-1 extending in the axial direction of the bearing 9 is not only formed to be exposed on the sliding surface with the shaft 7-21, but may be formed as a hole parallel to the shaft. The shape of the radial concave portion 10-1 can be arbitrarily selected as the shape used in a known dynamic pressure bearing structure. In order to ensure relative rotation with respect to the bearing 9 fixed and held to function as a dynamic pressure bearing, the thrust receiving member 10 is integrally formed with the rotor shaft 7-21 as shown in FIGS. Will be retained.

[00010]

The canned motor pump according to the present invention comprises:
This has the effect of preventing the sliding contact wear of the bearing end portion or the contact surface of the thrust receiving member due to the thrust of the rotor during the turning operation of the impeller, thereby improving the product life and improving the reliability.

[Brief description of the drawings]

FIG. 1 is a sectional view of an example of a canned motor pump according to the present invention.

FIG. 2 is a partially enlarged view of a bearing and a thrust receiving member in the example of FIG.

FIG. 3 is a front view of a sliding contact surface of the thrust receiving member in the example of FIG. 1;

FIG. 4 is a cross-sectional view of an example of a conventional canned motor pump.

FIG. 5 is a partially enlarged view of a bearing and a thrust receiving member of the example of FIG. 4;

FIG. 6 is a front view of a sliding contact surface of the thrust receiving member in the example of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor casing 2 Can 3 Pump casing 4 Stator room 5 Rotor room 6 Pump room 7 Motor 7-1 Stator 7.2 Rotor 7-21 Shaft 8 Impeller 9 Bearing 9-1 Groove extending in the axial direction 10 Thrust Receiving member 10-1 Recess formed to be inclined in the radial direction

Claims (2)

[Claims] 1. A stator having a motor casing, a cup-shaped can, and a pump casing, disposed in a stator chamber surrounded by the motor casing and a cylindrical portion of the can, and an inner peripheral surface of the stator. A DC canned motor pump comprising: a driving motor including a rotor mainly composed of a permanent magnet and rotatably opposed to each other through a small air gap; and an impeller integrally held by the rotor and arranged in a pump casing. One of the bearing members disposed on the side receiving the thrust for supporting the rotor has a thrust receiving member that extends in the axial direction on or near the inner peripheral surface that is in sliding contact with the shaft and is disposed in contact with the bearing member. A passage communicating with the sliding contact opposing surface is formed, and the thrust receiving member has a contact surface with the bearing member, the outer peripheral side thereof is closed and the inner peripheral side is open to the bearing member sliding contact opposing surface. Through A canned motor pump characterized by having a plurality of inclined grooves communicating with a road. 2. A stator having a motor casing, a cup-shaped can, and a pump casing, disposed in a stator chamber surrounded by the motor casing and a cylindrical portion of the can, and an inner peripheral surface of the stator. A DC canned motor pump comprising: a driving motor comprising a rotor mainly comprising a permanent magnet and rotatably opposed via a small air gap; and an impeller integrally held by the rotor and arranged in a pump casing. One of the bearing members disposed on the side receiving the thrust that supports the rotor has a thrust receiving member that extends in the axial direction on or near the inner peripheral surface that is in sliding contact with the shaft and is disposed in contact with the bearing member. And a thrust receiving member is formed of an annular ceramic plate sandwiched between the housing and the body contact portion, and the bearing member of the annular ceramic plate is formed. A plurality of inclined grooves communicating with the passage opening on the outer peripheral side and opening on the inner peripheral side of the bearing member sliding contact opposing surface.