RU2810852C2 - Water protection device for submersible motor - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: invention can be used in waterproof devices for submersible electric motors. The device contains an outer housing, a shaft for transmitting torque, a support and a bearing unit with two parts. The design of one part of the bearing assembly uses two radial-axial bearings installed in a support. The mating part of the bearing assembly uses a bidirectional axial bearing mounted on the shaft. The radial-axial bearings are arranged with their end working surfaces facing each other with the ability to limit the movement of the bidirectional axial bearing. A device is installed on the shaft for forced injection of liquid into the central channel of the shaft, which is made with holes for liquid circulation.

EFFECT: invention is aimed at simplifying the design of the bearing assembly of a waterproof device and simplifying manufacturing.

5 cl, 1 dwg

Description

The invention relates to mechanical engineering and can be used in waterproof devices for submersible electric motors.

Waterproof devices for submersible electric motors are known from the prior art, in which separate bearing units are used to distribute the axial and radial load of the shaft.

For example, an axial support for the hydraulic protection of a submersible electric motor, containing a movable heel mounted on the protector shaft and a stationary thrust bearing installed in the protector body, characterized in that the heel is made in the form of a steel body having a ceramic or carbide insert, and the thrust bearing is made in the form of a rigidly fixed protector body of a ceramic or carbide ring (Patent RU 46056 U1, class IPC F04D 13/00(2000.01), publication date 2005.06.10), or the axial support of the protector of the hydraulic protection of a submersible electric motor, containing a movable heel mounted on the protector shaft and fixed, installed in the tread body there are thrust bearings, characterized in that the heel has bilateral hydrostatic unloading by pressure created by a positive displacement hydraulic pump installed on the support shaft (Patent RU 57845 U1, IPC class F04D 13/00 (2006.01), publication date 2006.10.27).

A waterproof device for a submersible electric motor is also known, containing an outer housing, a shaft for transmitting torque, separate bearing units for distributing the radial and axial load of the shaft (Patent RU 2693120 C1, class IPC F04D 29/044 (2019.02), publication date 07/01/2019 ).

The disadvantages of the above analogues are the complexity of the design of the bearing assembly of the waterproof device.

The technical problem solved by the claimed invention is to overcome the disadvantages inherent in the analogues disclosed in the description of the prior art.

The technical result of the invention is to simplify the design of the bearing assembly of the waterproof device and simplify manufacturing.

The technical result is achieved in that the waterproof device for a submersible electric motor contains an outer housing, a shaft for transmitting torque, a support and a bearing assembly with two parts, according to the invention; in the design of one part of the bearing assembly, two radial-axial bearings are used, installed in the support, and on the mating part - a bidirectional axial bearing mounted on the shaft, while the radial-axial bearings are located towards each other with end working surfaces with the possibility of limiting the movement of the bidirectional axial bearing, and a device is installed on the shaft for forced injection of liquid into the central channel of the shaft, made with holes for fluid circulation.

In addition, the bearing body has through holes for fluid circulation.

In addition, characterized in that the support has holes for fluid circulation.

In addition, characterized in that the working surfaces of the bearings have grooves for fluid circulation.

In addition, characterized in that the device for forced injection of liquid into the central channel of the shaft is equipped with a filter element.

The essence of the invention is illustrated by the drawing.

In fig. 1 shows a general schematic view of the invention, where:

1 - housing of the waterproof device;

2 - support;

3 - support bearing;

4 - shaft bearing;

5 - shaft.

A water protection device for a submersible electric motor with radial-axial bearings contains a housing 1, a support 2 with a bearing 3 installed in it, a shaft 5 with a bearing 4 mounted on it.

To improve the circulation of lubricating and cooling fluid in the friction zone of bearings, through holes can be made in the shaft, bearing body and support, and grooves can be cut on the working surfaces of the bearings. It is also possible to install a device on the shaft for forced injection of liquid into the central channel of the shaft, which may have a filter element for cleaning the liquid, for example, from mechanical impurities.

A possible additional variant of the design of the invention is as follows: to ensure axial unloading of the shaft, it is possible to install two radial-axial bearings in the support, located towards each other with end working surfaces that limit the movement of a bidirectional axial bearing mounted on the shaft.

A water protection device for a submersible electric motor with radial-axial bearings can be used, for example, as part of a submersible installation of an electric centrifugal pump for pumping fluid from oil wells.

Thus, the above description of the invention makes it possible to simplify the design of the bearing assembly of the waterproofing device, simplify manufacturing and assembly.

Claims (5)

1. A water protection device for a submersible electric motor, containing an outer casing, a shaft for transmitting torque, a support and a bearing assembly with two parts, characterized in that in the design of one part of the bearing assembly two radial-axial bearings are used, installed in the support, and on the counter parts - a bidirectional axial bearing mounted on a shaft, while the radial-axial bearings are located towards each other with end working surfaces with the ability to limit the movement of a bidirectional axial bearing, and a device is installed on the shaft for forced injection of liquid into the central channel of the shaft, made with holes for fluid circulation. 2. The device according to claim 1, characterized in that the bearing body has through holes for fluid circulation. 3. The device according to claim 1, characterized in that the support has holes for liquid circulation. 4. The device according to claim 1, characterized in that the working surfaces of the bearings have grooves for fluid circulation. 5. The device according to claim 1, characterized in that the device for forced injection of liquid into the central channel of the shaft is equipped with a filter element.