RU2727306C1 - Electric drive - Google Patents

Abstract

FIELD: mechanic engineering; electrical engineering.SUBSTANCE: invention relates to machine building and electrical engineering, in particular to aerospace engineering, and can be used in other fields of engineering. Essence of invention consists in the fact that in electric drive, including sealed housing, fixed on base, on which there are installed electric motor with input shaft, connected through a reducer with output shaft, in the sealed housing base there is a gas supply device with a sealing plug, wherein the sealed housing is of a dome-shaped shape. Also in the electric drive the inner surface of the sealed housing is polished, and the device for gas supply from the inner side of the sealed housing is made in the form of a squeezing back spring-loaded valve, and from the external side in the form of a filling nozzle, the sealing plug is made as two-way.EFFECT: technical result of this invention is longer service life of elements of electric drive structure due to protection from vacuum, cosmic radiation, temperature difference, since elements of electric drive structure are arranged in tight polished inner volume filled with inert gas medium, preset composition, pressure and humidity, which makes it possible to provide convective heat sink from electric motor and gear mechanism during their operation.3 cl, 4 dwg

Description

The invention relates to the field of mechanical engineering and electrical engineering, in particular to rocket and space technology, and can also be used in other fields of technology.

Known electric drive RU 2442268 C1 IPC: H02K 5/124 (2006.01), F16K 27/06 (2006.01), containing a housing, in a cylindrical bore of which a torque motor is installed, covering the cylindrical bore, a sealing casing, a sealed electrical connector, and an axisymmetric bracket.

The disadvantages of this electric drive is the impossibility of providing under the body of a given composition, pressure and humidity environment, which protects structural elements from vacuum for a long time.

Close in technical essence to the proposed technical solution is an electric drive with a planetary gear RU 2688570 C1 MPK F16K 1/16, containing a sealed housing, an input shaft connected to an electric motor, a planetary gearbox and an output shaft.

The disadvantages of this electric drive with a planetary gearbox is also the impossibility of providing under the body of a given composition, pressure and humidity environment, which protects the structural elements from vacuum for a long time.

The objective of the invention is to create an electric drive with long-term operation in vacuum and space radiation, as well as to extend the service life of the components of the electric motor, rubber rings, microswitches and lubricants.

The essence of the invention lies in the fact that in an electric drive including a sealed housing fixed on the base on which an electric motor with an input shaft connected through a gearbox with an output shaft is installed, a gas supply device with a sealing plug is installed at the base of the sealed housing, while the sealed housing is made domed. Also, in the electric drive, the inner surface of the sealed body is polished, and the gas supply device from the inner side of the sealed body is made in the form of a push-off spring-loaded check valve, and from the outer side it is in the form of a filling fitting, the sealing plug is made of two-barrier.

The technical result of this invention is to increase the service life of the elements of the structure of the electric drive due to protection against the effects of vacuum, space radiation, temperature drops, since the elements of the structure of the electric drive are placed in a sealed, polished internal volume filled with an inert gas medium of a given composition, pressure and humidity, which allows to provide convection heat removal from the electric motor and the gear mechanism during their operation.

The essence of the invention is shown in FIG. 1-4.

FIG. 1 shows a general view of the electric drive in section;

FIG. 2 shows the electric motor;

FIG. 3 shows the filling mechanism of the electric drive;

FIG. 4 shows the filling mechanism of the electric drive with a docked filling device.

An electric drive containing an electric motor 1 with an input shaft 2, connected through a gearbox 3 with an output shaft 4. The electric motor 1 is installed on the base 5 of a sealed housing 6. The sealed casing 6 is dome-shaped with a welded base, which ensures structural strength in an external vacuum in the presence of an internal pressure. To facilitate the design and protect the parts of the electric drive from space radiation, the sealed housing 6 is made of aluminum. The filling mechanism is made in one piece with the base 5, from the inner side of the body in the form of a glass, with a push-off spring-loaded check valve 7 installed in it, and from the outside in the form of a filling nipple 8. A double-barrier sealing plug 9 is installed on the nipple 8, onto which it is screwed nut 10, pressing it to the fitting 8.

The electric drive works as follows: nut 10 is unscrewed from the filling connection 8 and the double-barrier sealing plug 9 is disconnected, and a filling device is screwed onto the thread of the connection 8, through which inert gas is supplied to the connection 8. The refueling device stem 11 presses on the end face of the push-off spring-loaded check valve 7, compressing the spring 12 abutting against its inner end and opening the flow section through which the inner cavity of the electric motor housing is filled from the refueling device with an inert gas, after which the refueling device 11 returns to its original position, and the push-off spring-loaded check valve 7 sits on the seat of the body 13 due to the expanding force of the spring 12, blocking the flow area. Next, the filling device is unscrewed and a double-barrier sealing plug 9 is installed, onto which the nut 10 is screwed, tightly pressing it to the filling connection 8.

To achieve the best effect, the inner surface of the sealed case must be polished, which reduces heat transfer from the internal elements of the drive structure to the external environment and increases the stability of the temperature regime of all structural elements, and its domed shape ensures the strength of the structure under external vacuum conditions in the presence of internal pressure.

Due to the fact that the medium of inert gas, with the specified physical properties, is pumped through the filling mechanism into the sealed housing, convection heat removal from the electric motor and the gearbox mechanism is provided, protection of the elements of the electric drive structure from the effects of vacuum and long-term maintenance of environmental conditions. Aluminum structural elements - body and base - provide protection of electric drive parts from cosmic radiation.

Thus, the task has been solved, the wear resistance of the structural elements of the electric drive increases, which leads to an increase in the service life of the electric drive.

Claims (3)

1. An electric drive containing a sealed housing, fixed on the base, on which an electric motor with an input shaft is installed, connected through a gearbox with an output shaft, characterized in that a gas supply device with a sealing plug is installed at the base of the sealed housing, while the sealed housing is dome-shaped ... 2. The electric actuator according to claim 1, characterized in that the inner surface of the sealed housing is polished. 3. The electric drive according to claim 1, characterized in that the gas supply device from the inner side of the sealed housing is made in the form of a push-off spring-loaded check valve, and from the outside it is in the form of a filling fitting, and the sealing plug is made of two-barrier.

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