Vertical centrifugal pump of hydraulic driven type

Abstract

The invention discloses a vertical centrifugal pump of a hydraulic driven type, comprising a pump component, a transmission component and a hydraulic driving component. The pump component comprises an impeller (1) and the like which are arranged in a spiral case (2); the transmission component comprises a main shaft (5) and a bearing seat (23) which is arranged above the spiral case (2) and is internally provided with a bearing connected with the main shaft (5); the main shaft (5) sequentially penetrates through the bearing seat (23) and the spiral case (2) and is connected with the impeller (1); a sealing piece is arranged between the main shaft (5) and the bearing seat (23); the hydraulic driving component comprises a hydraulic motor (7) which is respectively communicated with a high-pressure oil pipe (11) and a return oil cavity (9); and the main shaft (5) is connected with the hydraulic motor (7). The vertical centrifugal pump has the advantages of short pump shaft and high electric safety.

Description

A hydraulically driven vertical centrifugal pump technical field The invention relates to a centrifugal pump driven by a hydraulic motor, especially a hydraulically driven vertical chemical centrifugal pump with radial force self-balancing, which is suitable for the discharge and maintenance of chemical liquid media in industries such as petroleum, chemical industry, shipbuilding, and papermaking. delivery. Background technique Industries such as petrochemical and papermaking use storage tanks to store chemicals in large quantities; in the process of maritime transportation, large chemical transport cargo ships often use multiple large-depth and large-volume cargo holds to store dangerous chemicals. When the above-mentioned chemicals enter and leave the storage tank or cargo hold, chemical pumps are required to realize the transportation of chemicals, and vertical deep well pumps are the most commonly used method to install the storage tank or cargo hold. In the traditio...

AI Technical Summary

Problems solved by technology

This motor-driven vertical long-shaft submerged pump has the following obvious deficiencies in the process of transporting hazardous chemicals: First, the use of motor drive means that there are a large number of electrical equipment on the deep well pump, including motor-driven strong current and control The weak current of the system undoubtedly brings great safety hazards to many flammable and explosive chemicals; secondly, the deep well pump driven by a motor has to use a very long pump for a deep storage tank or cargo hold. The pump shaft (usually up to 5-10 meters), the deflection of the long-axis pump rotor is large, the stability of the rotor is poor, the failure rate is relatively high, and it brings inconvenience to the installation. Therefore, the too long pump shaft is also Bring hidden dangers to the safety and reliability of this type of motor-driven deep well pump

On the other hand, traditional vertical centrifugal pumps mostly use a single-outlet volute structure. Due to the uneven liquid pressure of each section in the volute, uneven radial forces will be generated on the impeller.

In the application where the pump shaft is long, this uneven axial force acts on the shaft end, causing a large disturbance to the shaft, causing rapid wear of the sealing ring and the shaft sleeve, and easily causing vibration

What's more serious is that for the rotating pump shaft, the radial force is still an alternating load, and a large radial force will cause the shaft to be damaged due to fatigue, seriously affecting the reliability and practical life of the deep well pump

Images