Non-disturbance ship main steam turbine control switchover system and switchover method

Abstract

A non-disturbance ship main steam turbine control switchover system comprises a hydraulic servo-motor and an electro-hydraulic actuator, wherein a valve rod of the hydraulic servo-motor is in drive connection with a cam steam distribution mechanism, the cam steam distribution mechanism is connected with an on-site operational hand wheel, the electro-hydraulic actuator is connected with a main controller, and the main controller is connected with a host manipulator. The non-disturbance ship main steam turbine control switchover system is characterized in that the hydraulic servo-motor is connected with a pilot valve, a valve rod of the pilot valve is provided with a displacement transmitter, the displacement transmitter is in electric connection with the main controller, an upper cavity and a lower cavity of a cylinder body of the hydraulic servo-motor are respectively connected with two oil path interfaces of the pilot valve, a drainage port of the pilot valve is connected with an oil discharging pipeline, an oil filling port of the pilot valve is connected with a transition tee joint which is connected with the oil discharging pipeline and a power oil pipeline, the oil filling port switches over linkage between the oil discharging pipeline and the power oil pipeline, and the transition tee joint is provided with a state detector which is in electrical connection with the main controller. The control precision is high, state is stable, and switchover controlling is smooth.

Description

technical field [0001] The invention relates to a control system of a ship's main steam turbine and a switching method of a control location, in particular to a control switching system and a switching method of a non-disturbance ship's main steam turbine. Background technique [0002] The control of the ship's main steam turbine is divided into local control and remote control room control. The local control uses a rigid connection structure for close-range operation through a mechanical hand wheel. The control link is simple, the failure rate is low, and the reliability is high. The operation in the engine room is labor-intensive, and only open-loop control of the valve position can be performed, and the control accuracy is low; the remote control room uses electrical equipment such as the main engine manipulator, main engine controller, electro-hydraulic actuator, wrong throttle, oil motor, etc. Remote operation with the mechanical structure through the electro-hydraulic ...

AI Technical Summary

Problems solved by technology

[0002] The control of the ship's main steam turbine is divided into local control and remote control room control. The local control uses a rigid connection structure for close-range operation through a mechanical hand wheel. The control link is simple, the failure rate is low, and the reliability is high. The operation in the engine room is labor-intensive, and only open-loop control of the valve position can be performed, and the control accuracy is low; the remote control room uses electrical equipment such as the main engine manipulator, main engine controller, electro-hydraulic actuator, wrong throttle, oil motor, etc. Remote operation with the mechanical structure through the electro-hydraulic signal, the steam valve opening can be automatically adjusted through the logic operation of the host controller in the control room, that is, the closed-loop control of the speed is performed through the rotation angle of the cam steam distribution mechanism, with high control accuracy and low labor intensity , the human-machine interface in the remote control room is good, but its components are many, and it is prone to failure points, especially when it is subjected to external shocks

Therefore, the existing ships that require high control reliability are equipped with the above two sets of control methods at the same time, with complementary advantages. The local control is only switched on when the remote control room fails or is used during drills, and the reliability is high; but this combination is still There are deficiencies. The traditional conversion method is to connect the conversion tee between the oil motor and the power oil pipeline, and directly control the on-off of the power oil by rotating the conversion tee. When the power oil is connected to the oil motor control, it is controlled by the remote control room. When the power oil is discharged from the oil motor to the oil discharge pipe, it is controlled locally. Since the control in the remote control room adopts the electro-hydraulic method, the local control adopts the mechanical method. When this direct conversion method is switched, the parameters of the two systems are not synchronized. As a result, it is impossible to maintain the stability of the steam regulating valve during switching, which inevitably produces fluctuations in the speed of the main engine, which will have a great impact on the service life and driving of the equipment, and technical improvement is still needed

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