RU144870U1 - HEAD OF RETURN-ACTION ACTION OF A LINEAR SUBMERSIBLE ELECTRIC MOTOR - Google Patents

Abstract

1. The head of the reciprocating action of a linear submersible electric motor, consisting of permanent magnets mounted on a shaft made of cobalt-samarium, which are protected from mechanical damage by rings installed on their outer diameter, and magnetic conductive cores in the form of disks made of corrosion-resistant steel, the outer diameter of which is larger than that of permanent magnets, characterized in that the permanent magnets are additionally protected from mechanical damage by rings installed by their inner diameter. 2. The head according to claim 1, characterized in that the protective rings are mounted on permanent magnets by pressing or gluing.

Description

The utility model relates to the field of electrical engineering, in particular to the design of linear electric motors for submersible units with a plunger pump, used for oil production.

The head of the reciprocating action of a linear submersible motor consisting of mounted on the shaft at the same distance from each other, permanent magnets and magnetically conductive cores made in the form of rings with a wear-resistant outer surface, the outer diameter of which is larger than the permanent magnets (see Eurasian patent No. 009268 B1, publ. 12/28/07, F04B 47/06).

This design has a high laboriousness of manufacturing, which is due to the fact that to protect the permanent magnets from the effects of the chemically aggressive environment in which the submersible electric motor operates, they are closed from all sides by additional structural elements connected by welding.

The head of the reciprocating action of a linear submersible motor, consisting of permanent magnets made of samarium-cobalt mounted on the shaft, which are protected from mechanical damage by rings installed on their outer diameter, and magnetically conductive cores in the form of disks made of corrosion-resistant steel, the outer diameter of which is larger than that of permanent magnets (see Utility Model Patent RU No. 114241 U1, publ. 10.03.12, H02K 41/02).

This design of the head of the reciprocating linear motor is selected as a prototype.

The disadvantage of this design, in relation to a linear submersible electric motor, is the low reliability and service life of the engine. This is due to the fact that submersible electric motors operate in small diameter wells and, to obtain the required power, they have a large length, which can reach 8000 mm. When assembling the head of the reciprocating action, permanent magnets are put on a shaft made of durable steel, with small (several hundredths of a mm.) Diameter tolerances. Magnets from samarium-cobalt are brittle and when moving on a shaft, to a length exceeding 1500 mm, they partially collapse in internal diameter, resulting in chips and cracks that significantly reduce the reliability and service life of the engine.

The technical result achieved by the implementation of the claimed utility model is to increase the reliability and service life of the engine.

The specified technical result is achieved due to the fact that in the head of the reciprocating action, consisting of permanent magnets mounted on the shaft, made of samarium-cobalt, which are protected from mechanical damage by rings installed on their outer diameter, and magnetic conductive cores in the form of disks made of corrosion-resistant steel, the outer diameter of which is larger than that of permanent magnets, permanent magnets are additionally protected from mechanical damage by rings, installed and their internal diameter.

In particular cases of the implementation of the utility model, the protective rings are fixed on permanent magnets by pressing or gluing

Utility Model Implementation

The drawing shows a longitudinal section of the head of a reciprocating linear submersible electric motor.

The reciprocating head consists of mounted on the shaft 1, magnetically conductive cores 2 and permanent magnets 3. Magnetically conductive cores 2 are made of corrosion-resistant steel with nitration on the outer surfaces. Permanent magnets 3 are made of samarium-cobalt, which is stainless and is not susceptible to destruction from the action of a chemically aggressive environment in which the submersible motor operates. Permanent magnets 3 are protected from mechanical damage by corrosion-resistant rings 4 and 5, which are fixed to the permanent magnets by pressing or gluing. Protective rings eliminate mechanical damage to permanent magnets during assembly and operation of the engine, which increases its reliability and service life.

Claims (2)

       1. The head of the reciprocating action of a linear submersible electric motor, consisting of permanent magnets mounted on a shaft made of cobalt-samarium, which are protected from mechanical damage by rings installed on their outer diameter, and magnetic conductive cores in the form of disks made of corrosion-resistant steel, the outer diameter of which is larger than that of permanent magnets, characterized in that the permanent magnets are additionally protected from mechanical damage by rings installed by their inner diameter. 2. The head according to claim 1, characterized in that the protective rings are fixed to permanent magnets by pressing or gluing.