Immersed pipeline type low-temperature pump

The utility model provides an immersed pipeline type low-temperature pump, and belongs to the technical field of low-temperature pumps for liquefied natural gas conveying. The pump comprises a pump body and a sealing type motor shell fixedly arranged in the pump body, a rotor is arranged in the sealing type motor shell, a pumping structure is arranged outside the sealing type motor shell, the top end of the sealing type motor shell is fixedly connected with an air guide cover, and the side wall of the air guide cover is fixedly connected with an exhaust pipe communicated with the interior of the air guide cover. The end, away from the air guide cover, of the exhaust pipe extends out of the pump body, a through hole used for communicating the interior of the sealed motor shell with the interior of the air guide cover is formed in the top end of the sealed motor shell, and an air inlet pipeline structure communicating with the interior of the sealed motor shell is fixedly connected to the side wall of the seale