HIGH-TEMPERATURE COUPLING Russian patent published in 2022 - IPC F04D29/10 

FIELD: engineering elements.

SUBSTANCE: invention relates to magnetic couplings of centrifugal pumps used for pumping fluid media, primarily in the petrochemical industry when pumping petroleum products. High-temperature coupling consists of a driving magnetic half-coupling installed on the drive shaft and a driven magnetic half-coupling installed on the shaft of the sealed equipment and the sealing screen separating the driving and the driven half-couplings from the external environment. In the driving magnetic half-coupling, a protective shell is placed along the diameter of the inner surface of the magnets to prevent damage to the magnets, wherein the thickness of the protective shell is 0.5 to 1 mm; the inner space between the magnets and the protective shell is filled with an adhesive; the sealing screen is made of a non-magnetic material; the driven half-coupling consists of a body made of a non-corrosive metal, a magnetic core made as a hollow cylindrical structure, with permanent magnetic rows on the outer surface of said magnetic core, with inter-magnet panels made of a high temperature-resistant non-magnetic material installed between the magnetic rows; wherein the magnetic core made as a hollow cylindrical structure is made of a magnetic material with a thickness h1=12 to 17 mm, the magnets in the driving magnetic half-coupling and the magnets in the driven magnetic half-coupling are arranged in 12 rows each, with 72 magnets installed along the circumference in the half-couplings, respectively, and placed equidistantly along the adjoining diameters of the magnetic half-couplings; each row of the arranged 12 rows of magnets is composed of several magnets in the form of arc-shaped bars, wherein the length of one of the magnets is 10 to 30 mm, the magnets have the same thickness, and the width of the magnets on the driven coupling is 1.5 times lower or greater than the width of the magnets on the driving coupling, and the thickness of the permanent magnets of the half-coupling installed on the drive shaft is 0.9 to 1.1 of the thickness of the permanent magnets of the half-coupling installed on the working shaft in the cross section of the magnetic coupling; the optimal value of the dependency of the length L of the row on the average diameter d of the coupling L/d are in an 0.7 to 1.5 ratio, the gap z between the driven magnetic half-coupling 2 and the sealing screen 3 is from 1.5 to 2.5 mm, the average diameter of the coupling is calculated by the formula d=(D1+D2)/2, where D1 is the external diameter of the driven half-coupling and D2 is the internal diameter of the driving half-coupling.

EFFECT: higher productivity, operating reliability of the centrifugal pump, and smaller dimensions and lower weight of the magnetic coupling.

1 cl, 1 dwg