SU1645052A1 - Apparatus for cleaning inner surface of pipeline - Google Patents

Abstract

The invention relates to the cleaning of the cavity of a pipeline and improves the reliability of operation of the device. In the device between the magnetic blocks 4 and the cleaning device case 1, a magnetic conductor 6 is installed and the perforated elastic gasket 7, the perforation area of which is equal to the area of one pole of the magnetic unit. The perforation space is filled with ferromagnetic powder 8. If the cleaning device succeeds against an obstacle, the gasket 8 absorbs the impact force, and the ferromagnetic powder 8 ensures the transmission of magnetic flux from the radio conductor to the cleaning device body 1. 2 Il. l

Description

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The invention relates to the construction and operation of oil and gas pipelines.

The aim of the invention is to increase the reliability of the device.

FIG. 1 shows a cleaning device, a longitudinal section; figure 2 - magnetic holder, cross section.

On the housing 1 of the cleaning device are located cleaning elements 2 and magnetic sensors 3, consisting of magnetic blocks 4 of radial magnetization, fixed clamp 5 of non-magnetic material, magnetic conductor 6. perforated elastic layer 7 and ferromagnetic powder 8.

The device works as follows.

The ferromagnetic powder 8 is magnetized in a static magnetic field, transferring magnetic flux to the cleaning device body 1. An external magnetic field is formed through air gaps between the flanges of the cleaning elements 2 and the pipeline - the pole S and the free pole N.

When a cleaning device strikes an obstacle and vibrates on the run, an elastic gasket with 5 elements of a magnetic sensor clamped to it absorbs shock load both axially and radially, while compressing the gasket 7 ferromagnetic powder 8 partially increases the packing density, partially squeezes out from perforation cavities,

О 4 СЯ О

ate

The trapezoidal shape of the magnetic circuit provides an increase in the contact area of the magnetic circuit with an elastic gasket without concentrators of the magnetic field, which are rectangular cross-section nodes that create useless dispersion of the magnetic field. The elastic strip provides the damping of the magnetic blocks of the sensor. Filling the perforation of the elastic strip with a ferromagnetic powder ensures the transmission of the magnetic flux of the magnet to the cleaning device body, thereby creating an external magnetic field, one pole of which is the free pole of the magnet, and the second pole are the nodes of the cleaning element (brushes, flanges of the cuffs).

The advantage of ferromagnetic powder in the perforation of an elastic pad over magnetoelastics is that the magnetic permeability of magnetoelasters, which are magnetoelectrics, is 10–250, while the magnetic permeability of ferromagnetic powders of a high concentration is 5,000 to 10,000 with diameters 0.005-1 mm. Thus, in order to preserve the magnetic flux of a permanent magnet, the base area of a trapezoidal magnetic core must be ten times larger than the area of the magnet pole, while with a perforation coefficient of the gasket 0.7, the area should be only 30% larger than the magnet pole area.

Since it is economically feasible to use the same cheapest and most affordable magnetic materials with the same magnetic permeability for a continuous magnetic circuit and a magnetic particle magnetic conductor, from the magnetic resistance formula

jMoS

let Rm be the resistance of a solid magnetic circuit, and Rm2 is the resistance of a magnetic powder magnetic circuit and, if we compare them, we get

And 12 ft Si fiSz

 h and Si are the length and cross section of the solid magnetic circuit;

12 and - the same, magnetic powder magnetic circuit.

Prin in constructive H "12, we get

Si - 82.

The assumption h h in this design is valid, since in a limited annular gap between the pipeline and the cleaning device case, the maximum height must be at the magnetic unit, and therefore the limits of variation I are small and are determined by the design minimum. In fact, an area of $ 2 at

the powder filling factor of the order of 0.85 will be somewhat less, but this value will be within the limits of the allowable 10-15% deviation of the parameters of the magnetic system.

The economic efficiency of the proposed technical solution in comparison with the prototype is determined by the fact that, with an equal number of magnetic blocks, the efficiency of magnetic sensors is increased by increasing the energy of the external magnetic field, and also when the cleaning device comes out of the pipeline, the magnetic sensors are retained

which provides savings of about 300 rubles per skip cleaning device.

Claims (1)

Invention Formula A device for cleaning the internal surface of the pipeline, containing cleaning elements mounted on a magnetic steel housing and magnetic sensors arranged between them in the form of blocks ring holders of permanent magnets of radial magnetization, characterized in that, in order to increase the reliability of the device, it is provided with radially mounted between the housing and the annular clips of trapezoidal magnetic cores and perforated elastic gasket mounted between the latter and the casing with a ferromagnetic powder in its perforations, the total perforation area of the elastic gasket being not less than the area of the like poles of the ring cage. x-fe "& 4 5 N / 7 : CHCHU h i / & h- ZDdK "U N s s / 7  i / & S