Long-shaft submerged pump with good stability

Abstract

The invention discloses a long-shaft submerged pump with good stability. The long-shaft submerged pump comprises a main shaft arranged in a shaft shell, wherein the main shaft is connected with a rotating shaft through a connecting device; an impeller is mounted at the top end of the rotating shaft; the connecting device comprises a shaft sleeve and a first spring; a sleeving hole formed in the axial direction of the shaft sleeve is formed in the shaft sleeve; the top ends of the main shaft and the rotating shaft are axially and movably mounted in the sleeving hole; the first spring is arranged between the main shaft and the rotating shaft in the sleeving hole; key grooves axially penetrating through the shaft sleeve are uniformly formed in the inner wall of the sleeving hole; key teeth clamped with the key grooves are arranged on the main shaft and the rotating shaft; and the shaft sleeve, the rotating shaft and the main shaft are coaxial. The long-shaft submerged pump overcomes the defects in the prior art, is convenient to overhaul and maintain, prevents damage to a sealing device at a pump shell caused by extension of the rotating shaft due to high temperature, and is more stable in use.

Description

technical field [0001] The invention relates to the technical field of pumps, in particular to a long-axis submerged pump with good stability. Background technique [0002] The long-axis submerged pump is suitable for various corrosive media such as conveyor belt particles, high viscosity, strong acid, alkali, salt, and strong oxidant. At present, the domestic long-axis pump can reach 20m. Generally, 3-5m is commonly used. Therefore, in the field of medium transportation, when it is necessary to pump medium with special components, such as large-scale steel enterprises producing high-grade cold-rolled automobile plates or high-end silicon steel plates, they need to pump pickling liquid, whose composition is 20% concentrated hydrochloric acid or hydrofluoric acid, etc. For mixed acid, the temperature is 80°C-100°C. Generally, a submerged pump is used to pump the above liquid. Due to the high temperature of the medium pumped by the submerged pump, the temperature of the pump s...

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Problems solved by technology

Therefore, in the field of medium transportation, when it is necessary to pump medium with special components, such as large-scale steel enterprises producing high-grade cold-rolled automobile plates or high-end silicon steel plates, they need to pump pickling liquid, whose composition is 20% concentrated hydrochloric acid or hydrofluoric acid, etc. For mixed acid, the temperature is 80°C-100°C. Generally, a submerged pump is used to pump the above liquid. Due to the high temperature of the medium pumped by the submerged pump, the temperature of the pump shaft rises rapidly, and the axial direction of the pump shaft will elongate. , causing damage to the sealing structure and shortening the service life of the shaft sleeve; in addition, due to the long pump shaft of some pumps, the pump shaft is easily deformed after being subjected to a large torque for a long time, causing the submerged pump to vibrate, damage, and the liquid Once the resonant frequency of the lower pump itself is coupled with a specific speed, severe resonance will also occur, which will damage the submerged pump

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