Mechanical seal stationary ring and rotating ring, and double-end mechanical seal composed of the same

Abstract

The invention provides a mechanical stationary seal ring, a mechanical rotating seal ring and a double mechanical seal composed of the mechanical stationary seal ring and the rotating seal ring, and belongs to the sealing technical field. The mechanical stationary seal ring comprises a circular stationary ring body, the side of the stationary ring body is of a stepped structure, a plurality of blind holes are evenly arranged on the upper surface of the lower end part of the stepped structure, the blind holes are internally provided with drive pins and little springs, an O-shaped seal ring is arranged on the external side of the upper end part of the stepped structure, and a stationary ring friction pair is arranged on the lower surface of the stationary ring body; the mechanical rotating seal ring comprises a circular rotating ring body, the internal surface of the rotating ring body is of a transversely zygomorphic stepped structure, circular fixed seats are symmetrically arranged on the external side of the stepped structure, and a rotating ring friction pair is arranged on the circular fixed seats respectively; the mechanical rotating seal ring is clasped between two mechanical stationary seal rings by the rotating ring friction pair and the stationary ring friction pair to form the double mechanical seal. The mechanical stationary seal ring, the mechanical rotating seal ring and the double mechanical seal are characterized by reasonable design, simple structure, good sealing effect and the like; as the springs are arranged on the stationary ring, the spring pressure does not fluctuate with the rotation of the rotating ring in the working process, and the probability of sealing failure is low.

Description

(1) Technical field [0001] The invention relates to a sealing technology, in particular to a static ring, a moving ring of a mechanical seal and a double-end mechanical seal composed of the same. (2) Technical background [0002] At present, most of the submersible pumps with dry motors use double-end mechanical seals and place them in the oil chamber to achieve axial sealing, which is used to prevent water outside the motor from entering the motor through the gap between the rotating shaft and the non-rotating part. [0003] In the existing double-end mechanical seal, the springs are installed on the moving ring and the design of the sealing ring is unbalanced. Since the spring is installed on the moving ring, when the submersible pump is working, the spring rotates with the moving ring at high speed, and the spring The pressure will fluctuate somewhat, causing the specific pressure on the sealing ring to fluctuate, thus affecting the sealing effect. Because the design of ...

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Problems solved by technology

[0003] In the existing double-end mechanical seal, the springs are installed on the moving ring and the design of the sealing ring is unbalanced. Since the spring is installed on the moving ring, when the submersible pump is working, the spring rotates with the moving ring at high speed, and the spring The pressure will fluctuate, which will cause the specific pressure on the sealing ring to fluctuate, thus affecting the sealing effect

Because the design of the sealing ring is unbalanced, when the pressure outside the oil chamber is higher than the pressure inside the oil chamber, the sealing surface may be pushed away and the seal will fail

[0004] At present, the single-end mechanical seal has a spring mounted on the moving ring and the design of the sealing ring is a balanced product, but such a design has not been found in the double-end mechanical seal products.

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