Cartridge mechanical seal without bushing and bearing

Abstract

The invention discloses a double-end-face cartridge mechanical seal without a bushing and a bearing. A front static ring, a front gland and a rear gland are arranged on the outer side of a pump body and sequentially connected, the front static ring, the front gland, the rear gland and the pump body are closed to form a cavity, and a pump shaft is connected with a tetrafluorohydrazine corrugated pipe in the cavity; and the surface of the front static ring and the surface of a front movable ring formed by embedding silicon carbide into the tetrafluorohydrazine corrugated pipe are matched to form a first grinding face, a half sub half ring is clamped to the rear end of the tetrafluorohydrazine corrugated pipe, a limiting wearproof piece is arranged at the rear end of the half sub half ring, a cylindrical pin is arranged between the limiting wearproof piece and the half sub half ring and is in transmission fit with a cold movable ring at the rear end, and the cold movable ring, a cold static ring, a push ring and a second elastic compensation element are sequentially connected with the rear end of the limiting wearproof piece. The surface of the cold movable ring and the surface of the cold static ring are matched to form a second grinding face. The cartridge mechanical seal has the beneficial effects of being capable of saving energy, environmentally-friendly, good in cooling effect, efficient in seal, light and handy in size, wide in application range and low in manufacturing cost and solves the problems that mechanical seal fails due to dry grinding caused by unsmooth supply, blockage, local vacuum and the like of a medium in the equipment operation process.

Description

technical field [0001] The invention relates to the field of mechanical seals, in particular to a double-end cartridge mechanical seal without shaft sleeves and bearings. Background technique [0002] Due to the pressure difference between the fluid inside the pump and the atmosphere outside the pump, in order to prevent the medium from leaking out, a sealing device must be installed when the pump is running. Unstable pressure in the medium, medium blockage or operating process errors lead to a short partial vacuum that makes the mechanical seal dry grinding invalid. The mechanical seal of ordinary fluorine-lined chemical pumps generally adopts WB2 type, 169 type and other external mechanical seals, which can only withstand a temperature of 100 degrees. When the temperature is too high, it may cause excessive compression of the spring and excessive transmission of the shaft. Excessive wear of the sealing surface may cause problems with the O-ring or connecting metal parts, ...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the above disadvantages, the present invention provides a sleeveless, bearingless, double-end cartridge mechanical seal with good cooling effect, good sealing effect, small volume and low manufacturing cost, which can prevent interference between the moving ring and the static ring. Grinding phenomenon, to avoid grinding surface cracking caused by temperature difference

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