RU26611U1 - SUBMERSIBLE OIL-FILLED MOTOR - Google Patents

Description

Submersible oil-filled motor

This utility model relates to the field of mechanical engineering, in particular to submersible borehole electric motors for driving pumping borehole units.

Known submersible oil-filled electric motor containing a lubrication system, a stator and a rotor mounted on a hollow shaft in radial and mechanical bearings, the lubrication system includes a volume expansion expansion oil coupled to the motor cavity (see patent RU 2166668, F 04 B 47 / 08.10.05.2001).

This submersible oil-filled electric motor is used to drive the downhole pump unit. However, its design has a relatively large number of pipelines for organizing the oil circulation process, which complicates the design and worsens its overall dimensions.

Closest to the utility model is a submersible oil-filled electric motor containing a lubrication system, a stator and a rotor mounted on the shaft in radial and mechanical bearings, the lubrication system includes an expansion joint for expansion of oil connected to the oil-filled cavity of the motor, and axial and radial channels for supplying grease to radial and mechanical bearings, (see, patent US 4350911, F04D 13/08, 09/21/1982).

This submersible oil-filled electric motor contains axial and radial channels made in the shaft for supplying lubricant to the sliding bearings, which makes the motor design more compact. However, this design of the electric motor requires the use of an oil pump driven by an independent source.

IPC 7 F 04 D 13/08

which leads to the complexity of the design and the deterioration of its overall characteristics.

The task which the present utility model is aimed at is to increase the reliability of the electric motor and improve its weight and size characteristics by simplifying the design of the drive of the oil pump and a more rational system of oil distribution and its circulation in the electric motor.

This problem is solved due to the fact that the immersed oil-filled electric motor contains a lubrication system, a stator and a rotor mounted on the shaft in radial and mechanical bearings, the lubrication system includes an expansion joint for expansion of oil, connected to the oil-filled cavity of the motor, and axial and radial channels for supplying grease to the radial and end bearings, while the electric motor is equipped with an oil pump, the rotor of which is mounted on the motor shaft, etc. the discharge side of the oil pump is connected by channels with an axial channel for supplying lubricant to the bearings with the oil leaving the bearings in the oil-filled cavity of the electric motor and then to the inlet of the oil pump, and cavities are made in the housing of the radial bearings, connected by throttling; their grooves are made on the inner sleeve bearings of the annular cavity or in the inner sleeve of the radial bearings are made cavities communicated by throttling; their grooves are made in the housing radial under ipnikov annular cavity ..

As the analysis showed, it was possible to simplify the design of the electric motor as much as possible by almost completely eliminating the connecting pipelines for organizing oil circulation in the electric motor and supplying oil to the radial and end

plain bearings. Moreover, it was practically possible to provide hydraulic suspension of the motor shaft in plain bearings. In this case, the only pipeline for the distribution of oil are axial and radial channels in the shaft of the rotor of the electric motor. As a result, the number of parts that could lead to failure of the electric motor is minimized. The possibility of oil leakage from the electric motor is also minimized. Dramatically increased the reliability of the bearings by reducing their mechanical wear. The installation of the rotor of the oil pump directly on the shaft of the electric motor made it possible to exclude all kinds of connecting parts from the design of the electric motor, for example, various kinds of couplings. In this case, the oil-filled cavity of the electric motor is simultaneously a channel for supplying oil from the upper radial and end bearings to the inlet of the oil pump.

The oil pump can be made of a roller-blade, gear or slide type.

Thus, the fulfillment of the task set in the utility model has been achieved - increasing the reliability of the electric motor and improving its weight and size characteristics by simplifying the design of the drive of the oil pump and a more rational system for distributing oil and its circulation in the electric motor.

Pa fig. 1 shows a longitudinal section through a submersible oil-filled electric motor, FIG. 2 is a section AA in FIG. 1, FIG. 3 is a section AA in FIG. 1 for an embodiment of cavities in an inner sleeve of radial bearings.

SUBSTANCE: submersible oil-filled electric motor contains a stator 1 and a rotor 2 mounted on a shaft 3 in radial 4 and end 5 sliding bearings. Motor lubrication system includes

a volume expansion expansion joint for oil (not shown in the drawing) connected to an oil-filled cavity 6 of the electric motor, and axial 7 and radial 8 channels made in the shaft 3 for supplying grease to the radial 4 and 5 end bearings. The electric motor is equipped with a roller-hazardous oil pump 9 or an oil pump of a different design, for example a sliding or gear type. The rotor 10 of the oil pump 9 which is mounted on the shaft 3 of the electric motor below or above its rotor 2. The discharge side 11 of the oil pump 9 is connected by channels 12 to the axial channel 7 for supplying grease to the radial 4 and end 5 bearings, and cavities 13 are made in the housing of the radial bearings 4, communicating by throttling; their grooves 14 with bearings 4, annular cavity 16 formed on the inner sleeve 15 of the bearings, oil ring 16. Oil exit from radial 4 and end 5 bearings of joint 1; en with an oil-filled cavity 6 of the electric motor, and the last communicated; en to the inlet 17 of the oil pump 9.

The cavity 18 is adjacent to the end bearing 5. It is also possible embodiment of the cavity 13 in the inner sleeve 15 (Fig.Z), and throttling; their grooves 14 in the housing of the radial bearings 4. In addition, in the housing of the radial bearings 4 or on the inner sleeve 15 can drainage grooves 19 must be made.

During operation of the electric motor, oil enters the oil pump 9 through the inlet 17 from the oil-filled cavity 6 of the electric motor. Further, the oil under pressure from the discharge side 11 through the channels 12 is fed into the axial channel 7 of the shaft 3. From the latter, oil passes through the radial channels 8 into the radial bearings 4 and the end bearing 5 into their annular cavities 16 and 18. In the radial bearings 4 from the annular cavity 16, the oil enters the cavity 13 through a throttling; groove 14 with the formation of an annular oil ring and hydraulic suspension of the shaft 3 of the electric motor. From radial 4 and

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end 5 bearings oil enters the oil-filled cavity 6 of the motor, washes the latter and from the cavity 6 enters the inlet 17 of the oil pump 9. Drain grooves 19 serve to improve the hydraulic discharge of the radial bearings 4 and are connected to the oil-filled cavity 6.

The present utility model can be used in the oil, mining and other industries where pumping various fluids from wells is required.

Claims (4)

1. Submersible oil-filled electric motor containing a lubrication system, a stator and a rotor mounted on the shaft in radial and mechanical bearings, wherein the lubrication system includes a volume expansion expansion oil coupled to the oil-filled cavity of the motor, and axial and radial channels for supplying lubrication to radial and mechanical bearings, characterized in that it is equipped with an oil pump, the rotor of which is mounted on the motor shaft, while the discharge side of the oil pump it is connected by channels with an axial channel for supplying lubricant to bearings with oil leaving the bearings in the oil-filled cavity of the electric motor and then to the inlet of the oil pump, and in the housing of the radial bearings there are cavities communicated by throttling grooves with an annular cavity made on the inner sleeve of the bearings or in the inner sleeve of the radial of the bearings are cavities communicated by means of throttling grooves with an annular cavity made in the housing of radial bearings.  2. The electric motor according to claim 1, characterized in that the oil pump is made of a roller blade.  3. The electric motor according to claim 1, characterized in that the oil pump is made of a slide type. 4. The electric motor according to claim 1, characterized in that the oil pump is made of gear type.