Hydrodynamic and equilibrium combined seal for impeller of slurry pump

Abstract

The invention relates to an axial force equilibrium and hydrodynamic sealing device for the impeller of a slurry pump, which consists of an impeller, blades, impeller rear cover plate, primary auxiliary blades, secondary auxiliary blades, tertiary auxiliary blades, a sealing seat, multilevel radial sealing clearances, multilevel axial sealing clearances, equalizing orifices, an impeller hub, a shaft, a shaft sleeve and a shaft seal, wherein the multilevel auxiliary blades combine a multilevel axial seal, a multilevel radial seal and the equalizing orifices, so the sealing performance and axial force equalizing capacity of the combined seal are high; meanwhile, in the operation of the impeller, solid particles are prevented from entering the part of the axial seal effectively, so the pressure and wear of the part of the axial seal are relieved greatly and the service life of the shaft is prolonged.

Description

technical field [0001] The invention relates to a slurry pump impeller axial force balance and fluid dynamic seal, which belongs to a centrifugal slurry pump and a dynamic sealing device which adopts a combination of multi-stage auxiliary blades and balance holes. Background technique [0002] The slurry pump is used to pump the slurry containing solid particles. This slurry has strong wear on the shaft seal of the pump body, and the shaft seal is easy to wear and fail. The general slurry pump adopts the rear cover of the pump impeller to set the first-stage auxiliary blade. , and cooperate with a sub-impeller connected in series with the impeller on the shaft, but the suction port is opposite to the impeller, through the combination of the sub-blade and the sub-impeller to form a reverse balance pressure with the impeller to reduce the pressure at the shaft seal and prevent solids when the pump is running Particles enter the shaft seal, and the auxiliary blades drive the sl...

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Problems solved by technology

[0003] The problem to be solved by the present invention is to use a stepped auxiliary blade form to form a multi-stage auxiliary blade function, and there is a radial gap seal between each adjacent two-pole step. This stepped auxiliary blade has a multi-stage axial The combination of seal and multi-stage longitudinal seal has good sealing ability, and at the same time, it effectively prevents solid particles from entering the shaft seal during operation, greatly reducing the pressure and wear of the shaft seal, prolonging the life of the shaft, and multi-stage sealing for increasing the sealing effect. The auxiliary blade can be designed as an inclined surface, and a number of balance holes are opened on the back cover adjacent to the auxiliary blade and the hub to communicate with the original impeller suction port, which is used to balance the decrease of the sealing effect of the auxiliary blade after wear and the weakening of the balance axial force After the balanced axial force

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