2results about How to "Avoid abnormal operation" patented technology

The utility model discloses a pump structure for reducing hydraulic excitation under a bias working condition, and relates to the technical field of centrifugal pumps, in particular to the pump structure for reducing hydraulic excitation under the bias working condition in the industries such as oil refining and petrochemical engineering. According to the utility model, the impeller is arranged inside the pump body; the inlet end of the impeller blade adopts the three-section edge design, uniform pressure distribution is better facilitated, the sensitivity of the three-section inlet edge to the inlet attack angle is lower through CFD analysis, and therefore the design of the three-section inlet edge is more suitable for being used in the state of deviated working conditions. The three-section type edge design comprises a blade straight edge, a blade bevel edge and a blade round end; the two side edges, close to the blade inlet end, of the blade straight edge are designed to be blade bevel edges inclining inwards. The front end of the blade bevel edge is designed to be a blade round end. And the outlet throat part of the pump body is provided with a detachable baffle tongue movable block. According to the technical scheme, the problems that in the prior art, when a centrifugal pump is in a small-flow working condition, hydraulic excitation is too large, a bearing box is heated, and efficiency is low are solved.

This application provides a high-voltage DC power supply assembly, relating to the field of electronic technology, comprising: a reverse connection and backflow prevention module for connecting the power supply circuit when on and blocking backflow current from the energy storage module to the input terminal of the power supply assembly when off, and being in a off state when the input terminal of the power supply assembly is reverse connected; an energy storage module for providing energy to downstream loads when the power supply assembly is powered off; a reverse current detection module for real-time monitoring of whether there is reverse current flowing from the energy storage module to the positive bus, and generating a detection signal characterizing the reverse current state; and a control module for outputting a control signal to turn off the reverse connection and backflow prevention modules within a preset time when current backflow is detected based on the detection signal. Implementing the technical solution of this application achieves the effect of improving system reliability.