Negative-pressure pressurizing two-stage reversely-installed sealed multiform impeller combination petrifaction process pump

Abstract

The invention provides a negative-pressure pressurizing two-stage reversely-installed sealed multiform impeller combination petrifaction process pump and relates to the technical field of centrifugal pump production. An isolation cavity sealing cover is arranged outside a main shaft at the inner side of a suspension frame and at the rear end of a pump cover, a cylindrical isolation sleeve is arranged between the main shaft and the pump cover, an annular boss is integrally arranged at the rear end of the isolation sleeve, the annular boss is arranged between the pump cover 3 and the isolation cavity sealing cover, and a radial through hole is formed in the annular boss; a second-level mechanical sealing device provided with a spring is arranged between the cylindrical isolation sleeve at the inner side of the isolation cavity sealing cover and the main shaft; a frame oil seal is arranged between the isolation cavity sealing cover and the main shaft; a first-level mechanical sealing device provided with a spring is arranged between the cylindrical isolation sleeve and the pump cover; a communicating hole is formed in the center of an impeller gland and the inner end of the communicating hole is arranged at the rear end of an impeller located in the pump cover. The negative-pressure pressurizing two-stage reversely-installed sealed multiform impeller combination petrifaction process pump is capable of saving energy and the phenomenon that power grid power is polluted by higher harmonic waves generated due to the adoption of a frequency conversion device is avoided.

Description

technical field [0001] The invention relates to the technical field of centrifugal pump production. Background technique [0002] The pump is the conveying device of petroleum and chemical raw materials in the petrochemical industry, and it is also an important power device. For petrochemical process pumps, safety reliability is an important indicator of constant performance, especially the seal leakage indicator of the pump. [0003] Since the operating parameters of petrochemical process pumps change during operation, the use of throttling devices to adjust performance parameters will inevitably result in waste of energy. The frequency conversion device increases the purchase cost and the maintenance cost of the frequency conversion device. At the same time, the use of the frequency conversion device increases the power consumption of the frequency conversion device, and the grid power generates high-order harmonics, causing power pollution. [0004] There are three ...

AI Technical Summary

Problems solved by technology

However, due to the influence of vibration and other factors during the operation of the designed pump, the separation of the sealing surface will easily lead to the entry of gas, which will destroy the vacuum degree of the inner channel of the mechanical seal, resulting in a decrease in the cavitation performance of the pump.

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