Threaded seal structure for a vertical pump

By employing a reverse threaded connection between the impeller and the pump head housing, along with a labyrinth seal ring and a water-throwing ring structure in the vertical pump, the problem of reduced sealing performance in traditional vertical pumps has been solved. This ensures good sealing performance even after wear, reducing maintenance frequency and costs.

CN224742598UActive Publication Date: 2026-09-11GUANGDONG QIHUA IND EQUIP CO LTD
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Patent Information

Application Number
CN202521749165.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-08-18
Publication Date
2026-09-11
Estimated Expiration
2035-08-18

AI Technical Summary

Technical Problem

The shaft end seal of traditional vertical pumps suffers severe frictional loss under high pressure, high temperature and media containing impurities, requiring frequent maintenance, and the sealing effect decays rapidly over time. Mechanical seals are also complex in structure and expensive.

Method used

The impeller and pump head housing are connected by threads, with the thread direction opposite to the impeller rotation direction. Combined with a labyrinth seal ring and a water-throwing ring, liquid leakage is blocked. A labyrinth seal ring and a water-throwing ring are also installed at the motor connection to prevent liquid leakage.

Benefits of technology

It can maintain good sealing performance even after wear, reduce maintenance frequency, reduce maintenance costs, and improve the stability and lifespan of the device.

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Abstract

A threaded sealing structure for a vertical pump includes a pump head housing, an impeller connected to the inner side of the pump head housing, a sealing ring with its inner ring connected to the outer wall surface below the impeller, a pressure plate abutting the lower end face of the sealing ring and snapping onto the pump head housing, and a front cover abutting the lower end face of the pressure plate and connected to the pump head housing. The pressure plate and the front cover have openings in their middle sections, making the lower part of the pump head housing an inlet. The impeller is threaded to the pump head housing, with the thread direction opposite to that of the impeller. The pump head housing has an opening at its upper end, where a shaft core with its lower end connected to the impeller is located. A motor is connected to the upper end of this shaft core. A labyrinth sealing ring is located on the outer wall surface of the upper end of the shaft core. The advantages of this invention are: the thread can block liquid leakage in the gap when the impeller rotates; at the motor connection, liquid leakage is prevented by the cooperation of the labyrinth sealing ring and the water-throwing ring.
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