Self-balancing axial force adjusting structure

Abstract

The invention belongs to the technical field of fluid machines and particularly relates to a self-balancing axial force adjusting structure. The self-balancing axial force adjusting structure comprises a pump shell and a pump shaft. The portion, between a primary impeller and a secondary impeller, of a pump shaft body is at least provided with an auxiliary axial balancing assembly. The auxiliary axial balancing assembly comprises a movable thrust disc, a static thrust disc and a reverse thrust ring, wherein the pump shaft is coaxially sleeved with the movable thrust disc, the static thrust disc and the reverse thrust ring. The static thrust disc is fixed to a reverse guide vane of the primary impeller and a movable gap is formed between the static thrust disc and the pump shaft. The movable thrust disc and the reverse thrust ring are fixed to the pump shaft. Axial gaps are at least formed between the adjacent ends of the movable thrust disc and the static thrust disc and between the adjacent ends of the static thrust disc and the reverse thrust ring respectively. The axial gaps are communicated with a movable gap between a primary impeller cavity and the pump shaft, the movable gap between the static thrust disc and the pump shaft and a secondary impeller cavity. The self-balancing axial force adjusting structure can be used as an auxiliary assembly of a current mainstream balancing system, and therefore the force bearing capacity of a balancing system such as a balancing hub is improved.

Description

technical field [0001] The invention belongs to the technical field of fluid machinery, and in particular relates to a self-balancing axial force adjustment structure. Background technique [0002] As we all know, a centrifugal pump is a general-purpose mechanical device that drives the rotor to rotate through a motor, thereby boosting the pressure of the liquid medium and transporting it to the required place. During operation, while the rotor generates pressure on the liquid medium, the liquid medium also generates pressure on the rotor. This pressure will inevitably push the rotor to move axially, eventually affecting the normal operation of the centrifugal pump. Likewise, along with the rotation of the rotor itself, the pump shaft will also exert radial pressure on the pump casing that fixes the pump shaft. For this reason, it is necessary to try to eliminate or balance the above-mentioned axial force and radial force. At present, the force balance system in multi-stag...

AI Technical Summary

Problems solved by technology

However, it has been found that simply using this balance system will cause all the axial force to act on the balance hub section when the pump body is working, which can easily cause friction on the contact section, generate heat and burns, and even make the balance hub or thrust bearing failure, which will seriously affect the normal operation of the pump

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