Double-end-face containerized mechanical seal

Abstract

The invention discloses a double-end-face containerized mechanical seal which comprises a shaft sleeve, a static ring seat and a sealing seat. The shaft sleeve is sleeved with a main seal body and anauxiliary seal body, and the two ends of the main seal body are assembled between one end of the shaft sleeve and the static ring seat in a sealed mode respectively. A sealing cavity is formed in theend, close to the main seal body, of the sealing seat. The auxiliary seal body is assembled in a sealing cavity. The main seal body comprises a main movable ring, a main static ring and a main staticring seat, wherein the tail end of the main movable ring is mounted in a first mounting groove, a second mounting groove is formed in the end, close to the main movable ring, of the static ring seat,and the tail end of the main static ring seat is mounted in the second mounting groove. A third mounting groove is formed in the other end of the main static ring seat, the end, away from the main movable ring, of the main static ring is slidably matched in the third mounting groove, and an elastic compensation assembly is arranged between the bottom of the third mounting groove and the tail end of the main static ring. The double-end-face containerized mechanical seal is convenient to install and maintain, stable in performance and wide in application range.

Description

technical field [0001] The invention relates to the technical field of mechanical seals, in particular to a double-end cartridge mechanical seal. Background technique [0002] The working conditions of screw pump equipment are complicated, and they are used in many different industrial working conditions, which have high requirements for mechanical seals. The sanitary twin-screw pump has higher requirements for sealing. Traditional mechanical seals for twin-screw pumps are mostly tandem double-end mechanical seals, or back-to-back double-end mechanical seals, usually consisting of two sets of standard mechanical seals. [0003] Commonly used shaft seals for screw pumps include packing seals, labyrinth seals, and mechanical seals, and mechanical seals are divided into wet contact mechanical seals and dry non-contact mechanical seals. [0004] 1. Packing seal: Although it has the advantages of simple structure, easy maintenance and low cost, its short service life, large lea...

AI Technical Summary

Problems solved by technology

But there are also: short service life, large leakage (and gradually increases with the use time), high energy consumption (requires continuous ventilation and isolation)

Under the increasingly stringent environmental protection requirements and energy-saving requirements, it is difficult for labyrinth seals to meet the higher requirements for the use of process screw compressors. The proportion of its use is gradually decreasing, and it has reached a lower use level.

[0006] 3. Mechanical seal: Mechanical seal has the advantages of small leakage, long service life, energy saving and environmental protection, and simple maintenance, but it also has disadvantages such as relatively complicated structure, high cost of parts, high installation technical requirements, and lack of targeted design. However, compared with the shaft seal, it has a small leakage and a small shaft power consumption, which is in line with the current energy-saving and environmental protection requirements of the entire society. Mechanical seals have become the main shaft seal method for process screw compressors.

[0007] In the existing double-end mechanical seal structure applied to the screw pump, the main seal generally adopts the static ring compensation structure, but the existing main static ring structure is fit in the static ring seat through the sealing ring, and then the main static ring Corresponding elastic compensation elements are set at the tail. This structure has poor anti-deflection performance during the compensation sliding process of the main static ring, and is easy to get stuck, resulting in insufficient compensation and leakage, especially in high-speed operating conditions. The compensation of the static ring is not stable, which leads to the weakening of the sealing performance of the sealing surface and the risk of leakage

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