A lng submersible pump

Abstract

The invention discloses an LNG immersed pump and belongs to the technical field of LNG. A stator and a rotor shaft are arranged in a motor cavity in the LNG immersed pump, and side wall channels are arranged in the side wall of a pump body; a motor upper cover is connected to the rear end of the pump body and provided with a plurality of liquid flowing channels communicated with the side wall channels, and the liquid flowing channels are arranged in an inclined mode and intersect with one another at a liquid outlet; a motor lower cover is connected to the front end of the pump body, liquid via holes communicated with the side wall channels are formed in the motor lower cover, a shell is connected to the motor lower cover to form a working cavity and provided with a first-stage flow guide disc to partition the working cavity into a front cavity and a rear cavity, a flow channel communicated with the front cavity and the rear cavity is arranged on the first-stage flow guide disc, a second-stage impeller is arranged in the rear cavity, a first impeller is arranged in the front cavity, a liquid inlet is formed in the front cavity in a connected mode, and an inducer is arranged in the liquid inlet; the rotor shaft penetrates through the motor lower cover and the working cavity and extends into the liquid inlet, and the first-stage impeller, the second-stage impeller and the inducer are all arranged on the rotor shaft in a sleeved mode. The LNG immersed pump is simple in structure and suitable for being popularized and used.

Description

technical field [0001] The invention relates to the technical field of LNG, in particular to an LNG submersible pump. Background technique [0002] LNG is an abbreviation for liquefied natural gas. The main component is methane. LNG is colorless, odorless, non-toxic and non-corrosive, and its volume is about 1 / 600 of the volume of the same amount of gaseous natural gas. Therefore, liquefied natural gas is an effective way to store and transport natural gas, and it has developed rapidly this year. [0003] The LNG submersible pump is a core power output equipment that installs the pump and the motor in a sealed metal container to achieve zero leakage, avoid explosive environments, and eliminate ignition conditions for transporting liquefied natural gas and related cryogenic liquids. The key issues to be solved in the development include: research on electrical equipment of LNG submersible pumps, mainly research on low-temperature electrical insulation materials and low-tem...

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Problems solved by technology

[0005] With the rapid development of LNG technology, the requirements for the function of LNG filling equipment are higher, so it is determined that the LNG filling equipment must continuously improve the function characteristics. The existing LNG low temperature submerged submersible pump, the inflow and outflow of liquid are all is limited so that the pump power is low

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