A8516-040 汽轮机机械液压调速器

Description

A8516-040 汽轮机机械液压调速器

A8516-040是一款汽轮机机械液压调速器，是汽轮机控制系统中的关键部件，其主要作用是调节汽轮机的转速，确保其在各种负载条件下都能稳定运行。该调速器通过感知汽轮机的转速变化，自动调节进汽量，从而实现对汽轮机转速的精确控制。

A8516-040的工作原理主要涉及到导水叶开度调节过程、硬反馈作用过程和软反馈作用过程。当外界负载发生变化时，调速器会感知到转速的变化，并通过相应的机械和液压机构调整导水叶的开度，从而改变汽轮机的进汽量，实现对转速的调节。

具体来说，当机组带负荷运行时，若外界负荷突然减小，机组的转速会升高。此时，调速器中的离心飞摆转速也会同步上升，其所受的离心力增大，导致重块外张，通过一系列机械连接带动引导阀转动，改变引导阀中油路的通道状态。这一变化使得辅助接力器上腔的油排出，改变主配压阀的位置，进而调整主接力器活塞的位置，改变导水叶的开度，减少进入汽轮机的流量，使机组停止加速并恢复到额定转速。

此外，调速器中的硬反馈作用是确保在达到调节目标时能够及时终止调节过程，防止过度调节或调节不足。这一作用过程保证了调速器的稳定性和准确性。

总的来说，A8516-040通过其独特的工作原理和结构设计，实现了对汽轮机转速的精确控制，为汽轮机的稳定运行提供了重要保障。

A8516-040 汽轮机机械液压调速器

A8516-040 is a turbine mechanical hydraulic governor, is a key component in the turbine control system, its main role is to adjust the speed of the turbine, to ensure that it can operate stably under various load conditions. By sensing the speed change of steam turbine, the speed regulator can automatically adjust the intake of steam, so as to realize the accurate control of steam turbine speed.

The working principle of A8516-040 mainly relates to the opening adjustment process of the water guide blade, the hard feedback process and the soft feedback process. When the external load changes, the governor will sense the change in speed, and adjust the opening of the water guide blade through the corresponding mechanical and hydraulic mechanism, so as to change the intake of steam turbine and achieve the adjustment of speed.

Specifically, when the unit is running with load, if the external load suddenly decreases, the speed of the unit will increase. At this time, the centrifugal swing speed in the governor will also rise synchronously, and the centrifugal force it is subjected to increases, resulting in the outer tension of the heavy block, and the pilot valve is driven to rotate through a series of mechanical connections to change the channel state of the oil circuit in the pilot valve. This change causes the oil discharge from the upper chamber of the auxiliary relay, changes the position of the main pressure distribution valve, then adjusts the position of the piston of the main relay, changes the opening of the water guide vane, reduces the flow into the turbine, and makes the unit stop accelerating and restore to the rated speed.

In addition, the role of hard feedback in the governor is to ensure that the adjustment process can be terminated in time when the adjustment goal is reached, preventing over-adjustment or under-adjustment. This action process ensures the stability and accuracy of the governor.

In general, A8516-040 realizes the accurate control of turbine speed through its unique working principle and structural design, which provides an important guarantee for the stable operation of the turbine.