SU1569440A1 - Hydraulic system - Google Patents

Abstract

The invention relates to mechanical hydraulic drive and can be used in hydraulic systems of machine tools and automatic lines. The purpose of the invention is to expand the functionality of the relief valve for low power hydraulic systems. The hydraulic system contains a pump 1, in the pressure line 2 of which the check valve 3 and the hydraulic accumulator 4 are installed in series, the safety valve 5 and the overflow spool 6, the inlet 15 of which is connected to the outlet 17 of the check valve 3, and the inlet 7 of the safety valve 5 is connected to the inlet 11 of the check valve valve 3. The safety valve 5 and the overflow valve 6 protect the system from overload. 1 hp f-ly, 1 ill.

Description

5, its control cavity 8 and springs-20 in the spring cavity 9 and inlet 7

to the cavity 9 of the overflow spool 6 are communicated through the throttle 10 with the inlet 11 of the check valve 3, and the outlets 12 and 13 of the safety valve 5 and the overflow spool 6 are connected to the drain 14.

The inlet 15 of the overflow valve b and its control cavity 16 are connected to the outlet 17 of the check valve 3, and the safety valve 5, the overflow valve 6 and the check valve 3 are located in one unit 18. The hydraulic circuit works as follows.

When the pump 1 is turned on, the working fluid enters the inlet 11 of the check valve 3, which opens, passes the working fluid to the pressure hydraulic line 2 and the hydraulic accumulator 4, and also to the inlet 15 of the overflow valve 6. At the same time, the pressure from the pump 1 flows through the throttle 10 to the inlet 7 valve 5 and into the spring cavity 9 of the overflow spool 6; Increasing the pressure in the hydroline 2 provides charging of the hydroaccumulator 4. When the pressure reaches the maximum value at the inlet 7 of the valve 5, this valve opens, reducing the pressure in the spring cavity 9 by connecting the inlet 7 with the outlet 12 and the drain 14,

The setting of the valve 5 of the overflow spool 6 is selected so that a slight decrease in pressure in the spring cavity 9 by opening the valve 5 causes the opening of the spool 6 and the discharge of a part of the fluid flow into the drain 14. Simultaneously with the discharge

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valve 5 falls due to falling and leaking at the outlet of pump 1 in front of the check valve 3. The pressure drop in cavity 9 causes the valve 6 to open completely and the accumulator 4 and the pressure hydroline 2 are connected to the drain 14. During the discharge of the accumulator 4, the check valve remains closed .

Thus, the proposed hydra system allows to expand functional possibilities, providing pa load pressure source during operation of the hydraulic system in the mode of the valve of direct action and unloading - hydraulics of the battery when you turn off work

hydraulic system and pump.

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Claims (2)

1. A hydraulic system containing a pump in whose pressure line has consistently installed a return valve and a hydraulic accumulator, and an unloading and safety valve, including a safety valve with an inlet valve, a safety valve inlet, its control cavity and a spring cavity of the fresh valve. communicated through the throttle to the inlet of the check valve, and the outlet of the safety valve and overflow valve are communicated with the drain, in order to expand the unloading functionality but a safety valve for low power hydraulic systems, the overflow ash pipe inlet and its control cavity are connected to the outlet of the check valve. five 0 five 0 five 0 55 valve 5 drops due to a drop in pressure at the outlet of pump 1 in front of the check valve 3. The pressure drop in cavity 9 causes the valve 6 to open completely and the hydroaccumulator 4 and the pressure hydraulic line 2 are open with the drain 14. During the discharge of the hydroaccumulator 4, the check valve 3 remains closed . Thus, the proposed hydraulic system allows to expand the functionality, providing a pass - load of the pressure source during the operation of the hydraulic system in the mode of the valve of indirect action and unloading - hydroaccumulator when the work is turned off hydraulic system and pump. i Invention Formula 1. A hydraulic system containing a pump, in a pressure hydraulic line of which a check valve and a hydraulic accumulator are installed in series, and an unloading and safety valve including a safety valve with an overflow valve, a safety valve inlet, its control cavity and the spring cavity of the overflow valve, communicate through a throttle with the inlet of the check valve, and the outlets of the safety valve and the overflow spool are connected to the drain, characterized in that, in order to extend the functionality a relief valve for low power hydraulic systems, the overflow spool inlet and its control cavity are connected to the outlet of the non-return valve. 51569440 " 2. The hydraulic system of clause 1, of which is a safety valve and a reverse valve with the fact that the discharge valve is located in one unit.