JPH06632Y2 - Submersible motor pump thrust bearing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a thrust bearing device for a submersible motor pump.

(Prior Art) There are conventional submersible motor pumps used in a state of being immersed in water, and as shown in FIG.
And a pump section B mounted on top of this.

The motor unit A is composed of a stator 1 and a rotor 2, and a motor shaft 3 which is a rotation center shaft of the rotor 2 is supported by an upper radial bearing 4 at an upper portion and a lower radial bearing 5 at a lower end portion. Therefore, the motor shaft 3 is provided with a thrust bearing device for supporting the thrust acting thereon. That is, reference numeral 6 denotes a tubular member that projects into the center of an end bracket 7 that forms the lower surface of the motor portion A, and encloses the radial bearing 5 therein. The upper end surface of the cylindrical member 6 is formed as a slope 6a (see FIG. 4) which is a part of a substantially spherical surface, and the peripheral surface of the member 6 is provided with ridges 8 arranged appropriately. Reference numeral 9 is an annular bearing metal member which is fitted onto the upper end of the tubular member 6 so as to be freely movable within a certain range. It is supported at a fixed position in a coreable state,
The metal surface 9b is substantially orthogonal to the central axis of the radial bearing 5. The annular bearing metal member 9 has legs 9a.
Is provided, which interferes with the protrusion 8 and prevents rotation of the annular bearing metal member 9. On the other hand, the annular thrust plate 10 is orthogonally and concentrically fixed to the motor shaft 3 via a bearing frame 11 key-fixed to a fixed position of the motor shaft 3. Reference numeral 12 is a through hole provided in the radial direction of the annular bearing metal member 9, 13 is a cable for power transmission to the motor portion A, and m is a radial groove provided in the thrust plate 10.

The submersible pump is generally installed and used so that the motor shaft 3 is oriented vertically. During use, the thrust of the pump section B acts on the motor shaft 3 and the motor shaft 3 is pressed downward. It will be one. This thrust plate 10
Presses the metal surface 9b of the annular bearing metal member 9, the annular bearing metal member 9 causes an appropriate swing displacement along the slopes 6a, 9a, and therefore the metal surface 9b is brought into contact with the contact surface of the thrust plate 10. The thrust of the motor shaft 3 is supported in a uniform contact state without bias, that is, in a state where the core is automatically centered.

(Problems to be Solved by the Invention) When the above-mentioned submersible motor pump is used by tilting the pump itself laterally due to a decrease in water level, since the motor shaft 3 tilts laterally, the annular bearing metal member 9 is Similarly, when the metal member 9 is inclined and displaced, a gap is formed between the metal member 9 and the thrust plate 10, so that the annular metal member 9 may be lifted from the tubular member 6 as shown in FIG. If the motor shaft 3 continues to be used in this state, the motor shaft 3 shifts to a state in which it receives thrust toward the side where the annular bearing metal member 9 is present, and the thrust plate 10 is attached to the metal surface 9b of the metal member 9. Since the contact surfaces are unevenly contacted, there is a problem that abnormal wear of the metal surface 9c particularly occurs.

It is an object of the present invention to provide a thrust bearing device for a submersible motor pump which can solve the above problems.

(Means for Solving the Problems) In order to achieve the above object, according to the present invention, an annular bearing metal member is provided at the upper end of a cylindrical member that encloses a radial bearing for rotatably supporting one end of a motor shaft. The member is placed in an externally fitted condition and in a state where the member is in contact with an inclined surface capable of automatically centering, the metal surface of the member is made substantially orthogonal to the central axis of the radial bearing, and on the other hand, an annular thrust plate is made orthogonal to a certain position of the motor shaft A thrust bearing device that is fixed in a concentric and concentric manner, and that supports thrust acting on a motor shaft by the contact between the thrust plate and the metal surface, wherein a ring groove is provided on the outer peripheral surface of the upper end of the tubular member. The O-ring is fitted into the groove so that the outer circumference of the O-ring is slightly projected, and the O-ring is brought into close contact with the inner circumferential surface of the inner hole of the annular bearing metal member through the ring.

(Operation) Even when the submersible motor pump according to the present invention is used with its motor shaft oriented in the lateral direction, the annular bearing metal member cannot be excessively pulled out from the tubular member due to the locking action based on the elasticity of the elastic body. This cannot occur, and since the annular bearing metal member is allowed to swing within a certain range due to the elasticity of the elastic body, it is possible to maintain a state in which automatic centering can be performed with respect to the tubular member. The thrust plate no longer makes uneven contact.

(Examples) Hereinafter, specific examples of the present invention will be described with reference to the drawings.

The description of the same parts as the conventional product will be omitted.

FIG. 1 shows a partial perspective view, and FIG. 2 shows a sectional view.

The present invention is characterized in that the annular bearing metal member 9 is supported only on the tubular member 6 or the same member as the cylindrical member 6 via an elastic body, so that the annular bearing metal member 9 is allowed to move within a certain range. So, specifically, do as follows.

That is, the ring groove 6b is provided on the outer peripheral surface of the upper end of the tubular member 6, and the O-ring as the elastic body 14 is fitted into the groove 6b. The diameter of the O-ring 14 is made larger than the depth of the ring groove 6b so that the outer peripheral edge of the O-ring 14 slightly protrudes outside the groove 6b when the O-ring 14 is fitted into the ring groove 6b. On the other hand, the longitudinal dimension 1 of the annular bearing metal member 9 is not lengthened as necessary, and the inner hole is made longer accordingly, and the diameter of the inner hole is set to an appropriate size with respect to the O-ring 14. To do. Then, the annular bearing metal member 9 is externally fitted to the tubular member 6 as in the conventional case, and the O ring 14 is brought into close contact with the inner peripheral surface of the inner hole of the annular bearing metal member 9 by an appropriate elastic pressure of the O ring 14. Eggplant Note that n is a radial groove provided in the annular bearing metal member 9.

If the submersible motor pump according to the embodiment is used, for example, with the motor shaft 3 in a lateral position, and the motor shaft 3 is temporarily displaced in a direction away from the annular bearing metal member 9, the annular bearing The metal member 9 is the tubular member 6
The O-ring 14 that comes into elastic contact with the inner peripheral surface locks the escape from the inside.

In the embodiment described above, the ring groove 6b is provided on the outer peripheral surface of the upper end of the tubular member 6 and the O-ring 4 is fitted therein. However, a spring is locked on the outer periphery of the annular bearing metal member 9, and the O-ring 4 is fitted to the end bracket 7. It does not matter if you pull it to the side.

(Effect of the Invention) According to the present invention, even if the submersible motor pump is used by tilting it from the vertical direction to the horizontal direction due to the reduction of the water level, the thrust plate 10 contacts the metal surface 9b of the annular bearing metal member 9. Uneven contact of the surfaces does not occur, abnormal wear is prevented, and the durability of the submersible motor pump is improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a part of the product of the present invention, FIG. 2 is a sectional view of the same, and FIG. 3 is a partial sectional front view showing a conventional submersible motor pump. FIG. 4 is a sectional view of a conventional product. 3 ... Motor shaft, 5 ... Radial bearing, 6 ...
Cylindrical member, 6a and 9a ... Slope, 6b ... Ring groove, 9 ... Annular bearing metal member, 9b ... Metal surface, 10 ... Thrust plate, 14 ... Elastic body (O ring ).

Claims (1)

[Scope of utility model registration request] Claims: 1. A slanting contact of an annular bearing metal member fitted on the upper end of a cylindrical member enclosing a radial bearing for rotatably displacing one end of a motor shaft and capable of automatically centering the member. Placed in a state in which the metal surface of the member is made substantially orthogonal to the central axis of the radial bearing, and on the other hand, an annular thrust plate is fixed at a fixed position of the motor shaft in an orthogonal and concentric manner. A thrust bearing device supporting a thrust acting on a motor shaft by contact of a metal surface, wherein a ring groove is provided on an outer peripheral surface of an upper end of the tubular member, and an O-ring is slightly protruded into the groove. A thrust bearing device for a submersible motor pump, characterized in that the thrust bearing device is fitted in such a manner as to be in close contact with the inner peripheral surface of the inner hole of the annular bearing metal member via the outer periphery of the ring.