Vertical barrel pocket type extraction pump

Abstract

The invention discloses a vertical bag type condensate pump, which is characterized in that a first stage impeller is a double suction impeller (2); the impeller (4) is closed; a radial guide vane (5) is positioned in an middle section (6); a balance drum (8) integrated with an upper shaft sleeve (10) is positioned on an upper main shaft (11); a balance drum sleeve (7) is positioned in an inner tube body (21); a narrow gap is formed between the balance drum (8) and the balance drum sleeve (7); a cavity above the balance drum (8) is communicated with an outer tube body (1) by a balance pipe (12); a guiding sheet (19) and a diversion cone (20) are positioned at the bottom part of the outer tube body (1), corresponding to the double suction impeller. The vertical bag type condensate pump has the advantages of compact structure, high efficiency, smooth operation, excellent anti-cavitation performance, and strong practicality and popularization value.

Description

technical field [0001] The invention relates to a water pump, in particular to a vertical barrel-type condensate pump. Background technique [0002] The vertical barrel-type condensate pump is used for pumping condensate in the power plant. Its suction side is highly vacuumed, and it is prone to cavitation and air inhalation. The requirements for the anti-cavitation of the pump are particularly high, and the head is as high as 150-350m. In the traditional structure, an inducer (15) is installed in front of the first-stage impeller to improve the anti-cavitation performance of the pump, and an impeller (16) with a balance hole and a decompression sleeve (18) are used to balance part of the axial force. The leaf body (17) is a space guide vane. The barrel-type condensate pump with this structure has the following defects: because the inducer is set in front of the first-stage impeller, the cantilever is long, and the running stability is poor. mm, which requires high install...

AI Technical Summary

Problems solved by technology

The barrel-type condensate pump with this structure has the following defects: because the inducer is set in front of the first-stage impeller, the cantilever is long, and the running stability is poor. mm, requires high installation accuracy

The impellers at all levels are equipped with balance holes, which disturb the flow state of the impeller inlet, increase the hydraulic loss and volume loss, and reduce the efficiency of the pump. At the same time, the balance holes can only balance 70% to 80% of the axial force, and the load borne by the bearing still larger

The guide vane body is a space guide vane with large axial dimension and high manufacturing cost, which is limited in the occasions with high head and many series. At the same time, the overall cantilever of the water pump is long, the operation vibration is large, and the service life is short.

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