Ch. 9 - CHAPTER 9 AUXILIARY COMPONENTS Fluid Power Circuits...

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1 CHAPTER 9 AUXILIARY COMPONENTS Fluid Power Circuits and Controls, John S.Cundiff, 2001 INTRODUCTION z Discussion of the hardware needed to connect the various components (pumps, actuators, valves, accumulators, filters, oil coolers) in a circuit. z Two key issues in fluid power are { P (pressure) { Q (flow).
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2 INTRODUCTION z Two key issues in the design of the lines between components are { sizing for the recommended maximum fluid velocity (related to Q). { selection of the pressure rating (P). z Conductors must have higher a working pressure rating than the maximum expected pressure in the system. RESERVOIR z The reservoir has four functions . { It separates entrained air . z Dwell time in the reservoir provides opportunity for air bubbles in the fluid to rise to the top and burst on the surface. { It dissipates pressure pulses . z Circuits with several actuators and random actuation of these actuators can have significant pressure pulses in the return line. { It provides cooling . z Heat exchange from the reservoir to the surroundings. { It traps contaminant . z If the reservoir has to trap contaminant, the filtration is not working correctly.
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3 RESERVOIR CONSTRUCTION z Recommended reservoir capacity is one to three times the pump output. z Machines are often less than three times the pump flow, but should never be less than one times the total pump flow. z Reservoir must be sized to hold all fluid from the cylinders when they are fully retracted. z When all cylinders are fully extended, the level of fluid in the reservoir must still be above the suction line to the pump. RESERVOIR CONSTRUCTION z Refer Fig 9.1 z A reservoir with maximum surface area per unit volume gives the best heat exchange.
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4 RESERVOIR CONSTRUCTION z Refer Fig 9.2 z The reservoir location should be chosen such that the distance h between the fluid level and the pump inlet is as great as possible. z A larger h reduces the potential for cavitations. z There should be good air circulation across all exterior surfaces. RESERVOIR CONSTRUCTION z Some modular units have pumps mounted on the top of the reservoir. The pump must provide enough suction to lift fluid into the pump.
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5 RESERVOIR CONSTRUCTION z Both inlet and return lines should be submerged. If the return flow jets across the surface of the fluid, air will be entrained in fluid. RESERVOIR CONSTRUCTION z Pump inlet should be some distance above the bottom of the reservoir to minimize the potential for ingestion of contaminants that have settled on the bottom. z A strainer should always be used at the inlet. z The drain plug should be located such that all oil can be drained from the reservoir.
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6 RESERVOIR CONSTRUCTION z Two baffle patterns. z
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This note was uploaded on 11/22/2011 for the course ABE 5152 taught by Professor Burks during the Fall '08 term at University of Florida.

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Ch. 9 - CHAPTER 9 AUXILIARY COMPONENTS Fluid Power Circuits...

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