Vibration isolation system

专利名称：Vibration isolation system发明人：Israel Helms申请号：US08/792024申请日：19970129公开号：US06000671A公开日：19991214

摘要：A vibration isolation system having at least three vibration isolation units. Eachof the units preferably has the same general configuration. The isolation units eachinclude a support stand having three (3) adjustable feet for adjustably supporting andleveling the isolation units on the floor of the site of operation of the precision

equipment desired to be isolated. The units further include a fluid tight cylinder. The fluidtight cylinder is connected to the support stand via three uniformly spaced rods in such afashion that allows horizontal movement of the cylinder relative to the support stand. Afluid is disposed in a chamber formed intermediate the fluid tight cylinder and thesupport stand thereby providing a thin film viscous shear damper for damping excitationshaving a horizontal component. The fluid tight cylinder is sealed by a diaphragm. A pistonis positioned directly above the diaphragm. A pair of stops limit the upward anddownward movement of the piston. A variable stiffener is positioned intermediate thelower stop and the piston to variably introduce the horizontal damper. The variablestiffener includes an annular elastomeric member having a circular cross- section. A thinfilm viscous shear damper is positioned in the fluid tight cylinder for damping excitation inthe vertical direction. This damper includes a conically shaped plunger operablyassociated with a tapered well or cup. At least a portion of the plunger and cup are

immersed in a liquid. The vertical damper is connected to the piston via a variablestiffener such that the vertical damper may be completely disconnected from the pistonduring the measuring stage to thereby avoid the transmission of any vertically orientedvibrations from the floor or otherwise, to the precision instrument. A support plate isconnected to the piston for supporting at least a portion of the load of the precisionmachine. The isolation unit also includes a leveling valve for maintaining the precisionmachine level.

申请人：ADVANCED ISOLATION SYSTEMS, LTD.

代理机构：Merek & Voorhees

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