Pump head device

Abstract

The invention discloses a pump head device, and belongs to the field of immersed pumps. The pump head device comprises a shell body, a main shaft, an impeller and a bearing, wherein a boss is coaxially arranged at the middle part of the top of the impeller; a sealing ring is coaxially arranged on the outer edge of the top of the impeller; and a first overflow gap is formed between the outer wall of the sealing ring and the inner wall of the shell body. The pump head device further comprises a balance disc, wherein the balance disc sleeves the main shaft; the balance disc comprises a first flange ring, a connection cone and a second flange ring; the first flange ring is detachably installed on the inner wall of the shell body, a first overflow cavity is formed among the sealing ring, the impeller, the boss, the balance disc and the shell body; a second overflow gap is formed between the second flange ring and the boss; a second overflow cavity is formed among the connection cone, the second flange ring and the main shaft; and a low-pressure inlet of the shell body, the first overflow gap, the first overflow cavity, the second overflow gap, the second overflow cavity, and a gap between an inner ring and an outer ring of the bearing are sequentially communicated. The maintenance cost for the pump head device is lowered.

Description

technical field [0001] The invention belongs to the field of submersible pumps, in particular to a pump head device. Background technique [0002] A submersible pump is a common type of centrifugal pump that is usually installed in ships to pump cryogenic liquefied gases. [0003] The pump head device is an important part of the submersible pump. It mainly includes a housing, a main shaft and an impeller. The main shaft is rotatably inserted in the housing. , the impeller rotates with the main shaft to realize the pumping of liquid cargo. [0004] In order to balance the upward axial force of the impeller caused by the uneven force on the upper and lower cover plates of the impeller when the submersible pump is working, a balance device is usually fixed on the upper cover plate of the impeller. The change of the flow gap between the balance device and the inner wall of the casing is used to enable the impeller to receive a downward axial force, so as to realize the balance...

AI Technical Summary

Problems solved by technology

However, since the balance device is fixed on the impeller, the balance device must rotate together with the impeller. Once the balance device wears out, the entire impeller needs to be replaced together, resulting in high maintenance costs for the pump head device.

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