JPS61164099A - Thrust bearing device for submergible pump - Google Patents

Abstract

PURPOSE:To prevent abrasion from occurring, by attaching an adjusting member, capable of moving a pad metal in an axial direction for adjustment, to an end bracket of a bearing seat. CONSTITUTION:A thrust bearing unit 10 supporting a motor shaft 3 of a submergible pump is provided with a thrust metal 11 and a bearing seat 13 tiltably supported at the inner part of an end bracket 12. An adjusting member 18, for making a pad metal 14 shiftable in an axial direction, is attached to the end bracket 12. This adjusting member 18 consists of three bolts, and it is pierced through and screwed in the end bracket on the circumference of a circle corresponding to the bearing seat 13 and the pad metal 14 whereby it is made so as to be shiftable in the axial direction in design. Therefore, early wear is preventable from occurring in the thrust metal and the pad metal irrespective of any variation in thrust load.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a thrust bearing device for a submersible pump. More specifically, the present invention relates to a thrust bearing device suitable for supporting a motor shaft of a water ring motor in a vertical submersible pump equipped with a water ring motor.

[Background of the invention]

FIG. 6 shows an overall view of a vertical type submersible pump using a conventional thrust bearing device. In this submersible pump, a motor shaft 3 is rotated by a magnetic field between a rotor 1 and a stator 2 of a submersible motor. When the motor shaft 3 rotates the pump shaft 5 connected via the shaft joint 4, the impeller 6 fixed to the pump shaft 5 is also rotated.

As a result, rotational force is applied to the water in the submersible pump, and the water is discharged from the impeller 6 by centrifugal force. It passes through the impeller 6 and is discharged from the upper discharge port 8.

In that case, 1. When operating under normal installed conditions, that is, when operating the submersible pump in a vertical position.

A downward thrust load is generated. The thrust load acts on the thrust bearing device 10 via the pump shaft 5 and the motor shaft 3, and is supported by the thrust bearing device 10.

FIGS. 7 and 8 show an example of the configuration of a conventional thrust bearing device 10. FIG. That is, this thrust bearing device 10 includes a thrust metal 11 fixed to the lower part of the motor shaft 3, a bearing seat 13 tiltably supported inside the end bracket 12 (upward in the figure), and a bearing seat 13. Multiple pad metals 1 arranged so as to be tiltable on the upper circumference
4, and this pad metal 14 is arranged opposite to the thrust metal 11.

The above-mentioned relative positions of the pad metal 14 and the thrust metal 11 provide the motor shaft 3 with a small amount of play in the axial direction. However, when the submersible pump is placed vertically and stopped, a thrust load is applied by the weight of the rotating members of the pump and motor, and the pad metal 14 contacts the thrust metal 11 to support the thrust load ( (Details on when this pump is operated and when it is placed horizontally will be described later).

The thrust metal 11 is fitted and fixed to the lower surface of a metal receiver 15 fixed to the lower part of the motor shaft 3,
It is an annular plate through which the motor shaft 3 can be inserted.

The bearing seat 13 has a concave spherical seat 13a on its lower surface, and the spherical seat 13a is connected to the end bracket 12.
It is tiltably supported by a spherical protrusion 16 that protrudes upward. Note that the ratio of the spherical seat 13a of the bearing seat 13 is different from that of the spherical protrusion 16. The end bracket 12 is a member that constitutes a part of the motor,
A lower end portion of the motor shaft 3 is supported above the spherical protrusion 16 via a radial bearing 17 .

The plurality of pad metals 14 have leg portions 14a each having a spherical tip, and when the leg portions 14a are inserted into a recess 13b provided on the upper circumference of the bearing seat 13, the bearing seat 13 is closed. It is mounted so that it can tilt with respect to 13.

This thrust bearing device 10 is of the so-called Mitchell type, and as shown in FIG. 9, when the shaft center of the motor shaft 3 is slightly eccentric during rotation.

The bearing seat 13 and the pad metal 14 are designed to be tilted so that they cannot self-align. When the thrust metal 11 rotates, a water film is formed between the thrust metal 11 and the pad metal 14 due to the water sealed in the submersible motor, and this water film directly affects both metals 11 and 14. Contact is prevented. Also, Pat Metal 14
The thrust metal 11 and the pad metal 14 are cooled by water flowing through the grooves 14b (see FIG. 7) formed on the upper surface of the thrust metal 11 and the pad metal 14.

Incidentally, the relationship between the thrust load due to fluid force and the discharge amount in a submersible pump is as shown in Fig. 1θ. That is,
When the discharge amount increases, the thrust load decreases, and when the discharge amount further increases, the thrust load becomes negative and acts in the direction of generating a reverse thrust load to levitate the rotating part.

Even if this reverse thrust load occurs, if the submersible pump is used vertically, which is its original usage, the submersible motor
There is no problem because the weight of each rotating body in the pump section works downward.

However, when the submersible pump is used horizontally, the weight of the rotating part does not act downward, and when the pump is operated at a particularly large discharge rate, the rotor 1 of the submersible motor is affected by the occurrence of a reverse thrust load. The pump part is drawn in, and as a result, a gap is created between the thrust metal 11 and the pad metal 14, so the pad metal 14 is tilted with respect to the thrust metal 11, as shown in FIG. 11(a). .

At this time, when the thrust load becomes positive again due to the decrease in the discharge amount and the thrust metal 11 and the pad metal 14 come into contact as shown in FIG. Since it is tilted, there is uneven contact, which causes a problem in that the thrust metal 11 and the pad metal 14 are prematurely worn. Further, when the rotor 1 is located close to the pump section when the submersible pump is installed or started, the pad metal 14 will be tilted, and the same problem as described above will occur.

[Purpose of the invention]

SUMMARY OF THE INVENTION In view of the problems of the prior art described above, the present invention provides a thrust bearing device for a submersible pump that can prevent premature wear even when used horizontally as well as vertically. .

[Summary of the invention]

In order to achieve the above object, the present invention is characterized in that an adjustment member is attached to the end bracket to adjust the movement of the pad metal in the axial direction.

[Embodiments of the invention]

The present invention will be explained below with reference to FIGS. 1 to 5. FIGS. 1 and 2 show a first embodiment of a thrust bearing device for a submersible pump according to the present invention, in which the same parts as in FIGS. 6 to 11 are designated by the same reference numerals, respectively.

The thrust bearing device 10 of the embodiment supports a motor shaft 3 of a submersible pump designed as a vertical type, and includes a thrust metal 11 fixed to the lower part of the motor shaft 3 and an inner side of an end bracket 12. It is provided with a bearing seat 13 that is tiltably supported, and a plurality of pad metals 14 that are tiltably disposed on the bearing seat 13 and are arranged to face the thrust metal 11 in the axial direction. This point is similar to the conventional example.

An adjustment member 18 is attached to the end bracket 12 to allow the pad metal 14 to be moved in the axial direction.

That is, the adjustment member 18 consists of three bolts, as shown in FIGS. 1 and 2, and these bolts are connected to the bearing seat 13 and the pad metal 1
Screw through the circumference corresponding to 4.

It can be moved in the axial direction. Therefore.

A screw hole 12a for screwing the adjustment member 18 is formed in the end bracket 12 along the axial direction.

Then, the head 18a of the adjustment member 18 is located outside the end bracket 12, and its tip 18b comes into contact with the spherical seat 13a of the bearing seat 13, so that the tip 18b can tilt the bearing seat 13. I support this.

Therefore, the tip end portion 18b is formed into a spherical shape, which has a curvature different from that of the spherical seat 13a of the bearing seat 13. By turning each piece from the outside of the elm and bulge 8.2 and moving the bearing seat 13 in the axial direction, it is possible to adjust the gap between the two so that the pad metal 14 and the thrust metal nttr are in contact with each other. →It is now possible to do so.

At that time, in order to be able to confirm the amount of movement of each adjustment member 18, the end bracket 12 is
A reference plate 19 for measurement is installed between leg parts lzb protruding from the lower part of. I swear that the reference plate 19 and the adjustment member 18
By keeping the distance n between the adjusting member 18 and the head 18a constant, the amount of movement of each adjusting member 18 can be confirmed.

Since the thrust bearing device 10 of the embodiment has the above-mentioned configuration, the operation of a submersible pump using this will be described next.

Now, when this submersible pump is installed horizontally and operated with a large discharge amount, a reverse thrust load is generated, causing the pad metal 14 and bearing 13 of the thrust bearing device 10 to tilt as in the conventional example. .

Early wear on pad metal 14 and thrust metal 11
゛ may occur.

However, since the adjustment member 18 is attached to the end bracket 12 and the movement of the pad metal can be adjusted by the adjustment member 18, the play between the pad metal 14 and the thrust metal 11 can be adjusted. That is,
The amount of play in the axial direction of the motor shaft 3 can be adjusted, so even if a reverse thrust load occurs.

It is possible to prevent the pad metal 14 from moving far away from the thrust metal 11, and therefore it is possible to reliably prevent the pad metal 14 from tilting.

As a result, it is possible to prevent the pad metal 14 and the bearing seat 13 from tilting, so even if the thrust load changes from negative to positive, the pad metal 14 is maintained in a normal contact state with the thrust metal 11. The film is reliably formed, and both the pad metal 14 and the thrust metal 11 can be reliably prevented from being worn out prematurely. In addition, even if the rotor 1 tends to move toward the pump part as in the conventional case, the pad metal 14 can be prevented from tilting, so that the position of the motor bearing seat 3 does not depend on the position of the motor bearing seat 3 when installing or starting the submersible pump. Therefore, premature wear can be reliably prevented. moreover.

When transporting the submersible pump, the pad metal 14 may be damaged due to vibration etc.
There was a risk that the and thrust metal 11 would collide with each other and be damaged, but if the two are adjusted in advance so that they come into close contact, there will be no damage. Since it is formed into a spherical shape, the bearing seat 1
Therefore, the self-aligning function of the bearing seat 13 is not impaired, and it is not necessary to form the spherical protrusion 16 of the end bracket 12.

Further, in the embodiment shown in FIG. 3, a reference plate 19 for measurement is provided, so that the amount of movement of the adjustment member 18 can be confirmed from the outside. 14 can be measured from the outside, and if this is done periodically, it is possible to determine the correct time for replacement.

FIG. 4 shows a second embodiment of a thrust bearing device for a submersible pump according to the present invention. In this example, the first
The difference from the embodiment shown in FIG. 1 is that the adjustment member 18' is composed of a single bolt. That is, the adjustment member 18' is
A threaded portion is cut into a curved surface having a uniform outer diameter, and is screwed into a position corresponding to the bearing seat 13 of the end bracket 12 so as to be movable in the axial direction. Then, the head 18'a of the adjusting member 18' is located outside the end bracket 12, and the tip 18'b of the adjusting member 18' is located outside the bearing seat 12.
In contact with the spherical seat 13a of No. 3, the bearing seat 13 is supported so as to be tiltable. At this time, the tip portion 18'b is formed into a spherical shape in order to provide the bearing seat 13 with a self-aligning function.

Note that, in order to support the radial load generated on the motor shaft 3, the motor shaft 3 is supported at an intermediate position in the case 20 of the underwater motor via a radial bearing 17.

In this embodiment, the gap between the thrust metal 11 and the pad metal 14 can be adjusted using a single adjustment member 18', so the adjustment work can be performed much more easily and quickly than in the first embodiment. be able to.

Also, in this case, as shown in Figure 5,! By installing a reference plate 19 for regular use, the wear amount of the thrust metal 11 and pad metal 14 can be measured from the outside based on the amount of movement of the adjustment member 18'. [Effects of the Invention] The above implementation As is clear from the examples, one aspect of the present invention is to attach an adjustment member to the end bracket that can adjust the gap between the thrust metal and the pad metal, and to prevent the pad metal and the bearing seat from tilting by adjusting the adjustment member. With this configuration, it is possible to reliably prevent premature wear of the thrust metal and pad metal due to variations in thrust load. Therefore, according to the present invention, there is an advantage that a submersible pump that should originally be used vertically can be used satisfactorily even when placed horizontally.

[Brief explanation of drawings]

Fig. 1 is a half-sectional view showing a first embodiment of the thrust bearing device for a submersible pump according to the present invention, Fig. 2 is a plan view showing the mounting position of the adjustment member with respect to the bearing seat and pad metal, and Fig. 3 is a reference. FIG. 4 is a broken sectional view showing the second embodiment of the thrust bearing device for a submersible pump according to the present invention; FIG. 5 is a broken sectional view showing the state in which the reference plate is installed. It is a diagram. Fig. 6 is a partially cutaway overall view showing a submersible pump equipped with a conventional thrust bearing device, Fig. 7 is an enlarged half-sectional view showing a conventional thrust bearing device, and Fig. 8 shows the bearing seat and pad metal. 9 is an explanatory diagram showing the self-aligning function of the main parts of the thrust bearing device, and FIG. 10 is a curve diagram showing the relationship between the discharge amount of the submersible pump and the thrust load. FIGS. 11(a) and 11(b) are explanatory half-sectional views showing a conventional thrust bearing device in a horizontally placed state. 3... Motor shaft, 10... Thrust bearing device, 1
1... Thrust metal, 12... End bracket, 13... Bearing seat, 14... Pad metal, 18
．． 18'... Adjustment member, 18b, 18' b... Tip portion of the adjustment member. Agent Patent Attorney Tadashi Akimoto Figure 7 Figure 2 Figure 3 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 θ Figure 1o

Claims (1)

[Claims] 1. A thrust metal fixed to the lower part of the motor shaft, a bearing seat tiltably supported at the end bracket,
In the thrust bearing device for a submersible pump, the submersible pump has a plurality of pad metals tiltably supported on the bearing seat and arranged axially opposite to the thrust metal, wherein the pad metal is adjusted to move in the axial direction on the end bracket. A thrust bearing device for a submersible pump, characterized in that an adjusting member is attached to the thrust bearing device. 2. In claim 1, the adjustment member comprises:
It consists of a plurality of bolts screwed onto the circumference corresponding to the bearing seat and pad metal of the end bracket so as to be movable in the axial direction, and the tips of the bolts support the bearing seat in a tiltable manner. Features a thrust bearing device for submersible pumps. 3. In claim 1, the adjustment member comprises:
A submersible pump comprising a single bolt screwed onto an end bracket so as to be movable in the axial direction at a position facing a bearing seat, and the tip of the bolt supports the bearing seat in a tiltable manner. thrust bearing device.