SU1240996A1 - Magnetic fluid unit - Google Patents

Description

The invention relates to a sealing technique and can be used to seal moving parts operating under pressure drop conditions.

The aim of the invention is to increase the reliability of operation by increasing the load capacity of the support element, which is achieved by improving the lubricant.

FIG. 1 shows a magneto-fluidic node, a section; in fig. 2 - shaft with magnet lines, open, full view.

The 10 rum of the projections 7 of the magnetic core 5 with axial displacement of the shaft 9 decreases the total volume of the cavities 13 and 14. Since the magnetic fluid is almost incompressible, therefore, an excess volume of liquid from the cavities 13 and 14 is redistributed in the form of rings on the outer end sides of the projections 8 and pole pieces 3. Such a redistribution leads to additional hydrostatic pressure in cavities 13 and 14,

15

The device contains permanent magnet 2 mounted in case 1 with pole pieces 3 and 4 and magnetic cores 5, b, made in the form of cylindrical sleeves with protrusions 7 and 8 of different diameters, mounted on shaft 9. Moreover, pole pieces 3 and 4 also have different internal diameters corresponding to the diameters of the magnetic cores 5 and 6 and form working gaps 10 with the latter. The communicating through the gap 11, in which the surfaces of the pole-shaped in a non-uniform magnetic field, magnetic tips 3, 4 and protrusions m gnitopro- liquid 15 is forced namazyvaets vodov 5b formed barbs similar for- during rotation shaft 9 on the inner po- us. The magnetic cores 5, 6 are made with the front surface of the support element 12. They are perceived as longitudinal to the shaft axis 9 Torus-Radial load Q y

Central surfaces, directed on the element in which the external encounters rotate, and mounted on the shaft 9 of the surface of the magnetic cores 5 and b. with the formation of a constant gap 11 Reducing friction and wear is achieved

(0.5 ... mm). The latter has the shape of a trapezoid that the magnetic fluid 15 of retraction expands to the shaft 9. with the field scattered into the gap 11, and since the internal surface of the constant field here is non-uniform in the radial magnet 2 the support element 12 is fixed, magnetic fluid 15 made of non-ferromagnetic material will be magnetically pressed against

the surface of element 12 and forcibly lubricate it. When the lubricity of the magnetic fluid deteriorates, its magnetization decreases. A fresh batch of lubricant with a high magnetization, located in cavities 13 and 14, under the action of the magnetic field, pushes the waste out of the gap 11. If the temperature of the support element 12 exceeds the ambient, then at the zarial, which forms with polar poles 3, 4 cavities 13 and 14, filled with magnetic fluid 15.

Magneto-fluidic node works as follows.

The magnetic circuit is formed by a permanent magnet 2, pole pieces 3 and 4, magnetic cores 5 and b and a magnetic fluid 15. The latter, in the interdental space in a non-uniform magnetic field, will circulate the liquid field to seal the working volume of the magnetic-fluid assembly and lubricate it. With the appearance of alternating axial force

bones 15 for thermomagnetic reason. It also helps to improve the lubrication of the element 12 and reduce its temperature.

± Q, the mixing of the teeth, the magnetic conductors 5 and 6 relative to the teeth of the pole pieces 3 and 4 occurs, the magnetic resistance of the gap between the teeth increases and the opposite direction appears.

the applied axial force, the force that tends to return the shaft 9 with the magnetic cores 5 and 6 to the initial position. In addition, due to the implementation of the protrusions 8 of the magnetic core 6 of a larger diameter compared to the diameter of the projections 7 of the magnetic core 5 with axial displacement of the shaft 9, the total volume of the cavities 13 and 14 decreases. Since the magnetic fluid is almost incompressible, therefore the excess fluid volume from the cavities 13 and 14 redistributed in the form of rings on the outer end sides of the projections 8 and pole pieces 3. Such a redistribution leads to additional hydrostatic pressure in the cavities 13 and 14,

communicating through the gap 11, in which in a non-uniform magnetic field the magnetic fluid 15 is forcibly smeared as the shaft 9 rotates on the inner surface of the support element 12. The radial load Q y is sensed

The liquid will be circulated by the thermomagnetic cause. It also helps to improve the lubrication of the element 12 and reduce its temperature.

FIG. 2

Compiled by A. Beltsov Tehred I. VeresKorrektor S. Cherni

Circulation 880Signature

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

Claims (1)

A MAGNETO-LIQUID ASSEMBLY comprising a permanent magnet with pole tips installed in the housing, a shaft passing through the housing, a support element of non-ferromagnetic material placed between the pole terminals, and magnetic fluid in the working clearances, characterized in that, in order to increase the reliability of operation by increasing the load capacity support element, the unit is equipped with two magnetic cores made in the form of cylindrical bushings with protrusions of different diameters on the outer surfaces mounted on and facing the protrusions towards the pole ends, also made with different diameters corresponding to the diameters of the protrusions, while the end surfaces of the bushings, facing one another, are inclined with respect to the axis of the shaft and are installed with the formation of a constant gap in the form of a trapezoid, expanding towards the shaft and the supporting element is fixed on the inner surface of the permanent magnet, forming cavities with the pole tips and communicating with each other through the gap between the bushings. / Yu About WITH 05 figure 1