Problems in Hydraulic System and Hydraulic System Problem Solution Suggestions
Problems in Hydraulic System and Hydraulic System Problem Solution Suggestions
AIR PROBLEM IN OIL IN HYDRAULIC CYLINDERS
Effects of air in hydraulic oil:
JET CUT EFFECT
The air in the oil is compressed and enters the sealing element slot.
Compressed air bubbles expand with great energy when the pressure drops or changes.
The surface smoothness increases by negatively affecting the metal surfaces of the piston with the sealing element.
If the increased surface smoothness is in the form of capillary channels, it acts as a nozzle and the fluid speed increases.
Fluid reaching very high speeds creates a jet cutting effect.
Air bubbles are carried behind the sealing element.
Deformation occurs on the back surface of the sealing element.
DIESEL EFFECT in Hydraulic System
It creates the most significant damage in hydraulic digesters!
Quickly trapped air bubbles rise to very high temperatures.
This temperature causes the oil-air mixture in the environment to explode by burning.
The pressure that occurs at this moment increases 5-6 times the system pressure.
What is CAVITATION in the Hydraulic System? How Does Cavitation Occur?
Pressurized fluid increases its speed as it passes through a throat.
The decrease in static pressure with increasing dynamic pressure can continue until a vacuum is created.
The result of this is to release the saturated air in the oil as steam droplets.
If vapor droplets are pressurized as a result of cavitation, they explode.
As a result of this explosion, jet erosion occurs due to cavitation.
Metal surfaces deteriorate with the sealing element.
How Can We Block Air In The Hydraulic System?
By being careful during commissioning, disassembly and assembly,
By preventing the loosening of the fasteners,
Using sufficient amount of fluid,
By choosing the appropriate volume of oil tank,
While designing the tank, taking measures to prevent the formation of air.
HYDRODYNAMIC PRESSURE
The pressure in the space between the sealing elements in the hydraulic cylinders and the bearing element reaches a value and permanently deforms the sealing element.
Solution Suggestions for Hydrodynamic Pressure Problems
Hydraulic fluid accumulation on the front face of the sealing element can be prevented by opening helical channels on the cast or bronze bearing element used.
If band guides are used, the guiding band should be joined end-to-end circumferentially.
If the circumferential space as much as the K range is left, the hydraulic fluid will return to the system through this range.
In cases where it is not possible to open the helical channels, the hydrodynamic pressure can be relieved by opening a drainage hole in the channel of the throat sealing element shown in the figure.