SU450881A1 - Electric TurboTachometer - Google Patents

Description

The invention relates to a measurement technique and can be used in the petroleum industry to measure the rotational speed of a turbo-drill shaft when conducting oil and gas wells. The known electric turbochometers, which contain a protective housing filled with a liquid dielectric, in which the magnetoelectric alternator is placed, the full-wave rectifier, the rotation input unit, do not have sufficient power and sufficient measurement limit. The proposed turbo-tactometer differs from the known ones in that a second alternator is mounted in its case, the output winding of which is connected in series with the output winding of the first generator, and their rotors are articulated through a reducer. The drawing shows a schematic diagram of the electric tour of the othometer. It contains the generator I, driven in rotation from the turbo-drill 2, by means of the curved shaft 3. to obtain different angular speeds of the generators, and, consequently, different frequencies of the generators, their rotors are connected through a reducer 4. Successively connected windings of the generators are connected to the input of the full-wave detection devices 5 for separating the beat envelope of frequencies, the tachogenerators' motors, through a curved shaft with a tip b, are connected to a ledge 7 fastened on the shaft of the turbo-drill together with the successor 8; The rotation of the curved shaft and the rotors is carried out in radial-thrust and radial bearings, and the coupling of the curved shaft to the rotors of the generators through the couplings, or y. To ensure tightness

when the curved shaft rotates, its tip is articulated with the housing 10 by means of a bellows. And located at the point where the shaft is bent. To unload the elements of the turbo-instrument from the external pressure, its inner cavity is filled with a liquid dielectric.

One end of the generator winding is connected to the device case, and the other is brought out of the insulated cable through the gland 12 to the isolator - separator 13, the isolator - separator screwed onto the container 14, serves to electrically uncouple the drill string, together with a turbo-drill is connected to one end of the tacho generator winding, to the upper part - to the second. The parts that make up the isolator - separator 13 are assembled on a bonding material that provides the necessary mechanical strength and electrical insulation.

After starting the pumps, the turbo-drill 2 starts working, which transmits the rotation to the rotors of the generator

Ditch I, connected to the Tours Ibur shaft. As the generators rotate at different angular velocities, there are beats of frequencies, envelope

5 which is proportional to the speed of the shaft of the turbo-drill. The selection of the envelope is carried out using a detection device, the output of which is connected to the communication line.

Yu. / drill pipe string /. S1P output

The connection to the line is performed using an isolator-separator.

SUBJECT OF INVENTION

Electric TurboTachometer: containing a protective housing filled with a liquid dielectric containing the magnetoelectric

20 alternator, full-wave rectifier, speed input unit, characterized in that, in order to increase power and extend the measurement limit, a second alternator is mounted in the housing, the output winding is connected in series with the output winding of the first gene | 5 torus, and their

30 rotors are articulated via a gearbox.