tailieunhanh - Governing Fundamentals and Power Management phần 2

Chương 2. Thống đốc Hydro-cơ khí Cơ bản Thống đốc thành phần cơ khí Hydro Năm thành phần cơ bản của một thống đốc đã được đề cập trong Chương 1. Bây giờ chúng ta hãy xem xét kỹ hơn thủy điện-cơ khí cơ bản thống đốc làm việc như thế nào. | Manual 26260 Governing Fundamentals and Power Management Chapter 2. Hydro-mechanical Governors Basic Hydro-mechanical Governor Components The five fundamental components of a governor were mentioned in Chapter 1. Now let s take a closer look at how the basic hydro-mechanical governor works. The key parts of a ballhead hydro-mechanical governor are Speeder Spring Thrust Bearing Flyweights Pilot Valve Plunger Pilot Valve Bushing Oil Pumps Oil Pressure Regulation Servo Power Piston Compensation Drive Shaft The Speeder Spring The speeder spring is the part that sets the desired speed . Applying more force down on the speeder spring causes the governor to increase fuel. This initial force is usually set by the operator for the desired or reference speed. It can be set by a screw adjustment a knob a lever an electric motor air pressure or solenoids depending on the specific governor. Figure 2-1. Speeder Spring The design or shape of a speeder spring is critical to the proper operation of the ballhead. The speeder spring is generally shaped in a conical design. This shape helps maintain a more rigid design so that it won t buckle or flex to the side as force is applied. There are other shapes of speeder springs that offer a variable force over the length. Some springs are designed to be close to a linear operation and some are designed to be non-linear depending on the specific governor. Most governors use the linear-type speeder spring. The PG type governor uses a non-linear speeder spring. Woodward 5 Governing Fundamentals and Power Management Manual 26260 Thrust Bearing The thrust bearing is the part where the force of the speeder spring and the force of the flyweights sum together. If the speeder spring force and the flyweight force are equal there is no load on the thrust bearing. Figure 2-2. Speeder Spring Deflection A thrust bearing has a race on the top and a race on the bottom with the bearing in between the races. Since the flyweights rotate and the speeder .