Centrifugal pump mouth ring sealing device

Abstract

This invention relates to centrifugal pump ring sealing device. It includes sealing ring between pump case body and blade; fastening device fixing the sealing ring in rotating direction; closing ring; closing ring groove at internal face of pump case. The closing ring is arranged in the closing ring groove in order to prevent sealing ring moving in axial direction. The fastening device is composed of a fixing key, outer groove and inner groove. The outer groove is set at the internal face of pump case in axial direction. The inner groove is set at the external face of sealing ring in axial direction. The fixing key is set between outer and inner grooves. This invention has small size in radial direction. The sealing device is widely applied. It is convenient to assemble and repair. The service life is long.

Description

Technical field

[0001] The invention relates to a sealing structure, in particular to a mouth ring sealing structure for a centrifugal pump. Background technique

[0002] Existing centrifugal pumps often have floating or fixed sealing devices arranged on the matching surfaces of the front and rear mouth rings of the impeller due to the need for sealing. The sealing ring of the floating sealing device is generally made of non-metallic material, but the installation structure is more complicated, the radial size is large, and the reliability is not high; the sealing ring of the fixed sealing device is generally made of soft metal material, which is fastened to the pump casing with screws Due to the different metal materials, this structure has great differences in physical properties and poor reliability. Once it rubs against the rotating part, it is easy to damage the rotating part and the sealing device itself. In order to prevent large damage caused by friction, the sealing ring...

Images