Method and apparatus for eliminating cavitation in hydraulic systems
OwnerHanshi Sheninventor
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Abstract
This invention relates to the method and apparatus for eliminating cavitation in the hydraulic system. In the hydraulic fluid there is great difference between the seperating pressure of the air, water content and volatile substance from said fluid and the saturated vapor pressure of said fluid. With the heating method and vacuumizing technique, the air, water content and volatile substance in said hydraulic fluid which are sealed in a tank may be seperated and exhausted. With the changing of volume changeable device, the working fluid is pressurized up to the operating pressure. The apparatus designed according to this invention may be used either a movable pre-treatment device to replace the working fluid in the hydraulic system or an independent hydraulic pump station.
Claims12
A method for eliminating cavitation in hydraulic system, comprising the following operations:
- a. Filling a sealed tank with hydraulic fluid to full extent when a volume changeable device, which is connected to said sealed tank, is pressurized,
- b. Vacuumizing the volume changeable device so that the level of hydraulic fluid in said sealed tank descends, making space in the top portion of said tank to make the air, water content and volatile substances to separate from said hydraulic fluid and escape to the top portion of said sealed tank without volatilization of said hydraulic fluid,
- c. Vacuumizing said top portion of said sealed tank and volume changeable device simulaneously for exhausting said air, water content and volatile substances out of said tank, but not drawing out said hydraulic fluid, when the vacuum pressure in said sealed tank is substantially kept balanced,
- d. Gradually pressurizing said volume changeable device to make it expand until the desired operating pressure inside said sealed tank is reached, and
- e. Pumping said hydraulic fluid out of said sealed tank to supply said hydraulic system.
An apparatus for eliminating cavitation in the hydraulic system, comprising:
- a sealed tank with crown-shaped upper-inner wall,
- means for introducing hydraulic fluid into said sealed tank,
- means for removing said fluid from said sealed tank,
- a degassing device connected to the top of said sealed tank and composed of controlling pipelines, vacuum cut-off valves, vacuum pumps and measuring instruments to generate vacuum for exhausting the air, water content and volatile substances out of said hydraulic fluid, and
- a volume changeable device connected with said tank, said volume changeable device composed of a sealed flexible bladder which is connected to a pressurized air source through a controlling vacuum valve and is connected to the degassing device through said controlling pipelines for regulating and controlling the vacuum and the pressure and quantity of fluid in said sealed tank by changing the volume of said bladder.
Dependencies are inferred from the claim text.