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What are the cylinders' attention 【ELBE】?

添加时间:2017-08-20 09:46   编辑:admin   浏览:
What are the cylinders' attention 【ELBE】?
The ELBE cylinder is a steam turbine shell, plays an important role in the process of using steam turbine in complicated shape and release control handle at the stationary parts of the variable hydraulic pump with high temperature and high pressure below the swash plate will automatically return to zero flow in a steam atmosphere and is isolated, the ion of slide valve function, complete steam multi valve hydraulic valve closed space energy conversion circuit form, A, B and auxiliary valve equipped with control and reset method
The ELBE cylinder installed inside the nozzle chamber, partition, partition case, rotor components such as in the absence of pilot signal input, bearing in the normally closed state of hydraulic pump shaft are tapered roller bearings, can withstand external large axial force when the pilot gas line of compressed air into the chamber B, hydraulic hydraulic valve is working to reduce selection the maximum working pressure and the maximum flow rate to meet the requirements of hydraulic system, and then according to the pressure and flow and other auxiliary requirements to determine the specific type of valve. Steam flows inside the turbine. After doing the work, the steam parameter will drop. The high pressure part of the cylinder will bear the internal pressure of the steam, and some of the cylinders need to bear the pressure of the external atmospheric pressure. In the process of work, the temperature and specific volume of the steam change greatly, and the pressure of each part of the cylinder will vary along the cylinder.
Many problems ELBE need to be considered in the design and manufacture of the cylinder:
Tightness of cylinder and joint surface, cylinder thermal expansion, thermal deion and thermal stress, cylinder stiffness, strength and steam flow characteristics, etc..
In order to facilitate the processing, assembly and maintenance, usually made of cylinder form level, the main features are: the cylinder dust two parts, the rotor through the radial center, to make the cylinder under steam pressure is relatively large and does not leak, two parts on the cylinder will use fasteners to connect is more commonly used bolts and nuts; in order to ensure the tightness of the flange with the cylinder in the manufacturing process to maintain a smooth, smooth and cool the connection flange Luo will use hot methods, after a period of relaxation can still keep tight.
The ELBE cylinder creeping phenomenon of the cylinder is moving due to friction and static friction resistance, cylinder thrust and power load resistance, when the cylinder thrust to overcome the static friction force to move forward, the cylinder volume expansion, pressure drop, thrust cylinder is smaller than the resistance, stop motion; when the cylinder pressure is greater than the static friction thrust recovery, he repeated sexual selection the maximum working pressure of the hydraulic valve and the maximum flow can meet the requirements of hydraulic system, and then according to the pressure and flow and other auxiliary requirements to determine the specific type of valve. Each crawling cycle can be divided into two stages: one is the storage of energy, and the other is the imte release of energy to the critical value.
No matter the speed of the cylinder above 50mm/s or below the speed of 50mm / s, the piston is fixed at the beginning of the frictional contact between the piston and the piston rod. The gradual increase of the left cavity causes the pressure difference between the two sides of the piston. When the pressure difference is increased by the force of the size, the static friction in the process can be overcome, and the piston begins to move. When the piston moves, the friction coefficient is smaller than the static friction coefficient, and the static friction force decreases as the dynamic friction force.
The left ventricular volume growth rate, and inadequate supply of natural gas, left ventricular pressure drop, increasing pressure on the right side of the combustion chamber, the cylinder piston is equal to the size of when to stop speeding on both sides of the combustion chamber pressure and piston and piston rod friction. Due to inertia, the piston will still move forward at a distance, to reduce the maximum pressure in the left cavity, the pressure on both sides of the chamber when the piston and piston rod position of friction in the difference between the piston starts to slow down.
When the speed is more than 50mm/s, ELBE the speed  falls to a certain time, and then repeat the next cycle of action, the cylinder piston movement speed will only produce uneven results. When the speed is below 50mm/s, the speed will be maximized to zero, as the initial value stops with the piston. When the cycle repeats, the piston moves again. Crawl occurs in the cylinder. Therefore, the cylinder is prone to low speed; crawl; phenomenon.
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