Low-temperature immersed pump for sweeping, pre-cooling and spraying of LNG (liquefied natural gas) ship and floating device

By designing the impeller and flow guide shell of the large-speed pump, setting up an axial force balance device and a slipperable pump bracket, the existing LNG pumps have solved the problems of poor cavitation resistance and insufficient balancing ability, and achieving higher cavitation resistance and operating conditions.

CN119712570APending Publication Date: 2025-03-28DALIAN DEEP BLUE PUMP CO LTD
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Patent Information

Application Number
CN202411802269.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-09
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The existing LNG pumps have poor cavitation resistance and their balance ability cannot meet the ocean swaying conditions. The bracket uses a fixed bracket to easily damage under swaying conditions.

Method used

Design the impeller and flow guide shell of the large-scale speed pump to achieve the ability of the liquid cargo pump to absorb liquid level at a very low level; set up an axial force balance device and use a pump bracket to connect, which can slide radially to prevent the pump from loosening during swaying and surge.

Benefits of technology

It improves the anti-cavitation performance and balance ability of the pump, ensures that the rotor axial force is fully balanced under the marine swaying conditions, prevents the bracket from being damaged, and enhances the overall stability and safety of the pump.

✦ Generated by Eureka AI based on patent content.
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Abstract

The invention discloses a low-temperature immersed pump for sweeping, pre-cooling and spraying for an LNG (Liquefied Natural Gas) ship and a floating device, and relates to the technical field of low-temperature immersed pumps, in particular to the low-temperature immersed pump for sweeping, pre-cooling and spraying for the LNG ship and the floating device. An immersed pump is fixedly installed on a pump tower located in the cabin bottom through a pump support. A low-temperature cable junction box is arranged on a shell of the immersed pump and used for being connected with a motor cable in the immersed pump and a low-temperature cable outside the immersed pump. The low-temperature cable is fixedly arranged in the cabin through the low-temperature cable fixing device; the low-temperature cable penetrates through a low-temperature cable deck guide pipe arranged on a deck on the top of a cabin and then is connected with the normal-temperature cable and the junction box through an electrical penetrating connector. According to the technical scheme, the problems that in the prior art, an existing LNG pump is poor in cavitation resistance; the balance capacity cannot meet the ocean swinging working condition, and under the ocean environment swinging and shaking working condition, it cannot be ensured that the axial force of a rotor is completely balanced in a wide operation range; and a pump bracket adopts a fixed bracket, so that the pump bracket is easily damaged due to large stress under a swinging working condition.
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