A sealing structure and a centrifugal pump using the sealing structure

Abstract

The invention provides a seal structure, which is used for a multiple-stage centrifugal pump or a single-stage centrifugal pump and is matched with a rotating piece. The seal structure comprises an annular metal base body and an annular nonmetal lining, wherein at least one radial groove surrounding the inner wall of the metal base body and at least one axial groove along the axial direction of the metal base body are formed in the inner wall of the metal base body; the outer wall of the nonmetal lining is fitted with the inner wall of the metal base body, and is embedded into the radial groove and the axial groove. The seal structure has the advantages that a clearance between the seal structure and the rotating piece can be decreased, the leakage can be effectively reduced, and the efficiency of the pump can be improved; with the solving of a problem about hardness difference between the abrasive faces of metal materials, the occlusion problem is prevented, the abrasion is effectively reduced and the service life of the pump is prolonged; the seal structure can play a role in supporting a rotor component; by adopting the radial groove and the axial groove, the degree of embedding between the metal base body and the nonmetal lining is improved; the metal base body can also be reutilized for multiple times, so that the resource can be effectively saved.

Description

technical field [0001] The invention relates to the technical field of centrifugal pumps, in particular to a composite material sealing structure for pumps and a centrifugal pump using the sealing structure. Background technique [0002] Pump sealing structure, including sealing ring, guide vane sleeve, balance sleeve, and throat throttling bushing of the sealing cavity. And guide vanes, etc. play a protective role to prevent these larger parts from wearing out. They are used in conjunction with rotating parts such as impellers and shaft sleeves to seal, support, balance axial force or throttle through the small gap between the sealing structure and rotating parts. role. Traditional seal structures, including seal rings, guide vane sleeves, balance sleeves, and throat throttling bushes in the seal cavity, are all made of metal materials or metal-embedded non-metallic materials. The sealing structure is made of metal material, which is the same as or close to the material o...

AI Technical Summary

Problems solved by technology

For some highly corrosive media, the generally selected metal materials have poor seizure resistance. If the gap is too small, the seal ring kit and the impeller or shaft sleeve will easily bite to death, causing damage to the pump. If the gap is too large, the leakage will increase and the pump will be reduced. Efficiency, does not play the role of a sealing ring

The metal inlaid non-metallic material is made of a sealed structure, and the inlay part is easy to fall off, and some inlays are firm, but the metal base can only be used once and cannot be recycled multiple times

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