Abstract
Problems of the starting and operating of hydraulic components and systems in low ambient temperature: Part II Determining the clearance between cooperating elements during the hydraulic components start-up in extremely low ambient temperatures on the grounds of experimental researchSevere winters and sweltering summers which more and more often occur nowadays are the reason why machinery designers face many difficulties when designing devices which will be serviceable in extreme ambient conditions. Hence, defining the principles and conditions of safe operation of hydraulically driven machines and devices is essential for their designers and operators. For this reasons the author did a series of tests of hydraulic component and systems in thermal shock conditions (cooled-down components were supplied with hot working medium). The experimental tests were carried out in the laboratory of the Chair of Hydraulics and Pneumatics, Gdańsk University of Technology. They gave answer to the question how the effective clearance changes in such conditions and what parameters it depends on. Based on temperature graphs acquired from tests of heating up elements of hydraulic components it is possible to determine precisely change of clearance between cooperating elements.
Highlights
During the hydraulic components start-up in thermal shock conditions[1,2,3,4,5,6,7,8,9, 12,13] dynamic change of component’s elements dimensions due to thermal expansion is often encountered
Experimental research of various hydraulic components operating in low ambient temperatures undertaken by the author, allows to answer the question how the effective clearance changes in such conditions and what parameters does it depend on
The confirmation of the fact is found through the calculations of the difference in thermal expansion ∆lt and distortions resulting from the influence of pressure ∆lp performed for the spool valve RE2510/101 from Hydrotor (Fig. 21), where the spool diameter measured 18 mm
Summary
During the hydraulic components start-up in thermal shock conditions[1,2,3,4,5,6,7,8,9, 12,13] dynamic change of component’s elements dimensions due to thermal expansion is often encountered. Change of clearance is influenced, inter alia, by the temperature difference between hot oil and cold hydraulic unit, flow of working fluid, construction of the component, kind of material used and shape of component’s elements. Experimental research of various hydraulic components operating in low ambient temperatures undertaken by the author, allows to answer the question how the effective clearance changes in such conditions and what parameters does it depend on. The temperature, pressure and flow volume in the inlet and outlet channels of the components were measured
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