SU1208521A1 - Probe for measuring intensity of magnetic field in magnetofluid sealings - Google Patents

Abstract

The invention relates to a measurement technique and is intended primarily for measuring the strength of the magnetic field of a magnetic fluid seal. The purpose of the invention is to improve the accuracy of measuring J 4 / / (L N9 O 00 SP N9

Description

Electromagnet 19 enters the core. The rod 18 with the washer 17 moves away from the pole spacer 4. The annular gap formed breaks the continuity of the magnetic circuit and changes the magnetic field passing through the shaft 2. Inside the shaft 2 between the pole spacers, the i-Schlindrich bore is inserted into which the measuring coil 9 is inserted , Measurement of magnetic intensity

The invention relates to a measurement technique and is intended to carry out mainly measurements of the magnetic field strength of magnetic fluid seals (FFS).

The purpose of the invention is to improve the measurement accuracy due to the tight coupling of the turns of the measuring coils with the poles of the magnet.

The drawing shows a probe for measuring the magnetic field strength of magnetic-fluid seals together with a sealed shaft and a magnetic-fluid seal, a longitudinal section.

The device comprises a sealing body 1, into which a sealing shaft 2 is inserted. An annular permanent magnet 3 with pole spacers 4 is pressed into the sealing body 1, the gap between the pole spacers 4 and the shaft 2 is filled with ferrofluid 5. In the gap between the shaft 2 and the constant ring The main thread 3 between the spacers 4 is inserted into the outer coil b which has a magnetic shield 7. The shaft 2 has a bore 8, which is made opposite to the outer coil 6, E; which is pressed inside the coil 9 with the frame. The wire 10, coming from the ka-, carcass 9 through the hole 11 of the shaft 2, is connected to the wire 12 of the outer coil 6, and by the wire 13 these coils are connected by a wire 15 to a ballistic galvanometer 16 through a rotating current collector 14,

One of the polar spacers 4 has an annular gap, overlap 521

the floor induces an emf in coils 6 and 9, covered by a magnetic screen and connected in series. The signal enters the galvanometer 16. When the electromagnet 19 is de-energized, the annular gap is bridged by the washer 17 with the spring 22 and the magnetic conductor becomes solid. In coils 6 and 9, EMF reappears, which is recorded by a galvanometer 16, 1 sludge.

Washer 17, Washer 17 is connected by a rod 18 to the electromagnet core 19. The electromagnet 19 itself is attached to the device with a 5–20 arm. Axis 21 connects the electromagnet 19 bar, Spring 22 is located on the rod 8 and is designed to move the electromagnet core 19 The device works as follows

at once.

In order to measure a constant magnetic field, it is necessary that it be changed. In this device, this is achieved as follows. With

The inclusion of the electromagnet 19 triggers and draws its own measles. The armature of the electromagnet is connected by an axis 21 with the rod 18 and when the core moves the rod 18 together with the washer 17, retracts from the pole spacer 4. As a result of the washer 17 withdrawal, an annular gap appears in the spacer and the magnetic conductor breaks. The discontinuity of the magnetic core abruptly changes the magnetic field passing through shaft 2 from one pole spacer to another space. Measuring the strength of the magnetic field induces an emf in coils 6 and 9, the electrical signal through the wires goes to the galvanometer 16, thus produced metering, When the electromagnet 9 is de-energized, the spring 22 returns the washer

17 to its former place and, consequently, the magnetic core, by closing the annular gap in the pole plate 4, becomes continuous. As a result, the magnetic circuit

there is a magnetic flux and again in measuring coils 6 and 9 according to a Vits EMF, which is registered by the galvanometer 16.

Claims (2)

Invention Formula one . A probe for measuring the magnetic field strength of magneto-fluid seals containing an external measuring coil mounted between pole holders located on the sealing shaft, a rotating current collector connected to a recording instrument, characterized in that inside Editor L.Avramenko Tehred T, Tulik 282/56 Circulation 730 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab. D. 4/5 Branch PPP Patent, Uzhgorod, Proektna St., 4 0S521 the sealing shaft is made by a cylindrical bore between the pole spacers, in which the internal measurement is installed 5, the coil is connected in series through the hole in the shaft with the outer coil, and one pole has a ring slit, which is crossed by a spring-loaded washer with 10 electromagnet, which is fixed on an isolated base. 2. Probe pop. 1, characterized by the fact that the external and internal measuring coils 15 are provided with a magnetic shield covering them, and one pole spacer is attached to the outer coil through a non-magnetic gasket. Corrector S.Cherni