Vertical self-priming centrifugal pump self-supply water-cooling mechanical sealing structure

Abstract

The invention discloses a vertical self-priming centrifugal pump self-supply water-cooling mechanical sealing structure, comprising a pump shaft seal, a pressurized-water component and a connecting pipe. The pump shaft seal is arranged above an impeller, the pressurized-water component is arranged below the impeller, the pump shaft seal and the pressurized-water component are interlocked by a transmission shaft. A shell in the pressurized-water component is a water-storage container with a bottom, the shell is internally provided with an inner ring and an outer ring in clearance fit with each other; the outer wall of the inner ring and the inner wall of the outer ring are provided with multi-head rectangular threads with the same dimension and opposite direction of turning; and the rotary inner ring and the relatively static outer ring form a pump structure. The inner ring is internally provided with a bushing served as a support in clearance fit; the bushing is matched with a built-in core shaft key, and the bottom end face of the core shaft key is connected with the shell. The two ends of the connecting pipe are respectively with a water outlet of the pressurized-water component and a water inlet of the pump shaft seal. When the pump is restarted, as the shell naturally stores water, the pressurized-water component rotating with the pump shaft outputs the stored water at first time for water-cooling of the pump shaft seal so as to avoid dry friction of a rubbing pair and greatly improve service life of a mechanical seal.

Description

technical field [0001] The invention relates to a water-cooled mechanical seal structure, in particular to a self-contained water-cooled mechanical seal structure of a vertical self-priming centrifugal pump. Background technique [0002] Mechanical seal is a new type of shaft seal product with automatic compensation sealing function, which is widely used in pump shaft seal structure. Due to the special working environment of marine vertical pumps, the requirements for pump shaft seals are relatively high. The shaft seal structure of contemporary marine vertical pumps is the first choice for mechanical seals. [0003] The vertical self-priming centrifugal pump needs to inject water into the pump body when it is initially started. After running, the mechanical seal is still fully cooled by water. After the shutdown, the water in the pump body and pipeline will gradually fall back under the action of atmospheric pressure, and the mechanical seal on the pump body will be in an...

AI Technical Summary

Problems solved by technology

[0004] The present invention mainly aims at the deficiency that the mechanical seal of the existing vertical self-priming centrifugal pump is prone to produce dry friction of the friction pair in the subsequent start-up stage, and proposes a simple structure, fast water supply, sufficient water volume, and reliable cooling to ensure that the friction pair does not produce dry friction. Frictional vertical self-priming centrifugal pump self-contained water-cooled mechanical seal structure

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