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DEH system emergency trip control mechanism

A technology for emergency interruption and control mechanism, applied in mechanical equipment, engine components, machines/engines, etc., it can solve the problems of steam turbine overspeed and enterprise loss, and achieve the effect of stable operation, high safety and difficult operation.

Pending Publication Date: 2020-08-11
NINGBO CHUANGLI HYDRAULIC MACHINERY MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once there is a power outage caused by lightning and other weather reasons and the mechanical overspeed protection jams, the critical interruption system will not respond in time, which will cause the steam turbine to overspeed and cause huge losses to the enterprise

Method used

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  • DEH system emergency trip control mechanism
  • DEH system emergency trip control mechanism

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as figure 1 Shown is the first preferred embodiment of the present invention.

[0031] Such as figure 1 As shown, the DEH system emergency interruption control mechanism in this embodiment is used to make the regulating valve oil motor 92 act in response to the conduction of the overspeed protection control oil circuit 14 and the non-pressure return oil circuit 12 to close the regulating valve 102 and enable The main valve oil motor 91 acts to close the main valve 101 in response to the conduction of the emergency shutdown oil circuit 13 and the non-pressure oil return oil circuit 12 .

[0032] Such as figure 1 As shown, there are two one-way valves 4 between the emergency shutdown oil circuit 13 and the overspeed protection control oil circuit 14, and the two one-way valves 4 are arranged in parallel, and the inlets of the two one-way valves 4 are connected with the overspeed protection control The oil circuit 14 is connected, and the outlets of the two check v...

Embodiment 2

[0045] The difference between this embodiment and Embodiment 1 is that the oil outlet of the hydraulic reversing valve 2 can only communicate with the emergency shutdown oil circuit 13, so that the reversing of the hydraulic reversing valve 2 can only conduct the emergency shutdown oil. The oil circuit 13 is connected to the non-pressure oil return circuit 12, while the overspeed protection control oil circuit 14 is critically cut off by automatic shutdown.

Embodiment 3

[0047] The difference between this embodiment and Embodiment 1 is that the oil outlet of the hydraulic reversing valve 2 can only communicate with the overspeed protection control oil circuit 14, so that the reversing of the hydraulic reversing valve 2 can only realize the overspeed protection control oil circuit 14 and the overspeed protection control oil circuit 14. The conduction of the non-pressure oil return oil circuit 12, so that the emergency interruption control mechanism of the DEH system can only control the closing of the regulating valve.

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PUM

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Abstract

The invention discloses a DEH system emergency trip control mechanism. The mechanism is used for enabling a governor valve hydraulic servo-motor to act in response to communication between an overspeed protection control oil way and a non-pressure oil return oil way so as to close a governor valve and / or enabling a main throttle valve hydraulic servo-motor to act in response to communication between an automatic shutdown emergency trip oil way and the non-pressure oil return oil way so as to close the main throttle valve; the mechanism comprises a hydraulic reversing valve and a sequence valve; an oil inlet and an oil return port in the hydraulic reversing valve communicate with a pressure oil way and the non-pressure oil return oil way respectively, and an oil outlet in the hydraulic reversing valve can communicate with the automatic shutdown emergency trip oil way and / or the overspeed protection control oil way; and when the oil pressure of the pressure oil way is lower than the opening pressure of the sequence valve, the oil outlet and the oil return port in the hydraulic reversing valve communicate with each other, so that the automatic shutdown emergency trip oil way and / or the overspeed protection control oil way communicate with the non-pressure oil return oil way. According to the DEH system emergency trip control mechanism, the emergency trip can be responded in time under the conditions of shutdown and mechanical overspeed protection failure, the safety is good, and the self-control over emergency trip can be achieved.

Description

technical field [0001] The invention relates to the technical field of steam turbines, in particular to a DEH system emergency interruption control mechanism. Background technique [0002] DEH system (Digital Electric Hydraulic Control System) is the abbreviation of steam turbine digital electro-hydraulic control system. It is a professional control method for steam turbine generators. It is the only means to control the start, stop, speed control and power control of steam turbines. It is an indispensable control device for functions such as remote control and remote automatic dispatching. The DEH system is composed of computer control part (DEH control system) and hydraulic actuator (EH system). Among them, the DEH control system is the command center of the DEH system, and the EH system is the execution system of the DEH system. [0003] The EH system includes a fuel supply system, an actuator and an emergency interruption system. The function of the fuel supply system i...

Claims

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Application Information

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IPC IPC(8): F01D21/00F01D21/02
CPCF01D21/00F01D21/02
Inventor 林永泽韩冰励之渊谢林奇陈子翀
Owner NINGBO CHUANGLI HYDRAULIC MACHINERY MFG CO LTD
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