Horizontal high-back-pressure centrifugal pumping set

Abstract

The invention discloses a horizontal high-back-pressure centrifugal pumping set. The horizontal high-back-pressure centrifugal pumping set comprises an impeller, a pump body, a pump cover, a sealing seat, a motor, a base, a bracket, an elastic shaft end ejector and a nut. A flow path of the pump body has a double-layered volute structure; a valve-controlled discharging structure is arranged on the pump cover; and a mechanical seal and a packing seal are respectively arranged at two ends of the sealing seat. An outwards convex hub is arranged in the middle of the right end of the impeller and is in clearance fit with an inner hole of the left end of the pump cover; and because threads of which the screwing direction is opposite to that of the impeller are arranged on the outer wall of the hub, the reverse threads rotate in the inner hole of the pump cover so that a reverse-screw pressure releasing structure is formed. In order to counteract rightward thrust of back pressure on the impeller, the elastic shaft end ejector is arranged between a suction opening of the pump body and the impeller. By the pointed structure design, the horizontal high-back-pressure centrifugal pumping set can normally run for a long time after diving to an environment with pressure of 5.0MPa.

Description

technical field [0001] The invention relates to a hydraulic machine, in particular to a motor-driven horizontal single-stage single-suction centrifugal pump, in particular to a horizontal high-back pressure centrifugal pump set. Background technique [0002] With the advancement of the national marine strategic plan, relevant deep-sea technology research topics have been included in the national scientific research project plan. As we all know, the seabed is rich in resources. If human beings seek seabed resources, it is necessary to conduct exploratory technical research, and seabed operations must use manned deep-diving devices to send researchers to target waters. The centrifugal pump is one of the necessary equipment for the manned deep diving device. When the deep diving device is loaded into the dive, the pressure of each part of the centrifugal pump increases with the increase of the diving depth, and the maximum pressure value is as high as 4.5MPa. The commercially ...

AI Technical Summary

Problems solved by technology

Due to the lack of anti-pressure structural design of commercially available centrifugal pumps, they cannot be used for manned deep submersible devices. Thrust, axial thrust not only causes the mechanical seal to be unbalanced, but also deteriorates the working environment of the bearing that supports the rotation of the motor shaft, which easily causes the support to fail and the pump cannot operate normally

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