PULSATION ELIMINATING DEVICE FOR HYDRAULIC CIRCUIT

PURPOSE:To effectively prevent pulsation of pressure oil generated in a main line by varying the length of an auxiliary line according to the intensity of a frequency detected by a frequency detecting means, in a device having an auxiliary line to prevent pulsation of a pump delivery pressure. CONST...

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Bibliographische Detailangaben
1. Verfasser:	HIRAMI ICHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR ENGINEERING ELEMENTS AND UNITS FLUID-PRESSURE ACTUATORS FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING HYDRAULICS OR PNEUMATICS IN GENERAL JOINTS OR FITTINGS FOR PIPES LIGHTING MEANS FOR THERMAL INSULATION IN GENERAL MECHANICAL ENGINEERING PIPES POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS PUMPS FOR LIQUIDS OR ELASTIC FLUIDS SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	PURPOSE:To effectively prevent pulsation of pressure oil generated in a main line by varying the length of an auxiliary line according to the intensity of a frequency detected by a frequency detecting means, in a device having an auxiliary line to prevent pulsation of a pump delivery pressure. CONSTITUTION:A pulsation removing device 8a is provided with a number of revolutions detector 12 to detect the number of revolutions of a hydraulic pump 2, a pressure detector 13 to detect the pressure of a main line 7, and a temperature detector 14 to detect a pressure oil temperature. First and second auxiliary lines 9a and 9b in which on-off valves 10 and 11, respectively, are located are connected to a main line 7. By controlling the on-off valves 10 and 11 by a control device 15 by means of output signals from the detectors 12-14, the length of the auxiliary line is varied and pulsation of pressure oil discharged with the aid of a hydraulic pump 2 is prevented from occurring. A length L1 of the first auxiliary line 9a is set to a value suitable for damping of pulsation in the maximum drive state of an actuator 5 and set to a value higher than lengths L2 and L1 of the second auxiliary line 9b.