SU700676A1 - Pump capacity automatic regulator according to pressure - Google Patents

Description

I

The proposed device relates to the field of hydraulic equipment and can be used in any hydraulic system where it is necessary to automatically regulate the pump performance of the pump, including in systems of volume - throttle control.

The automatic pressure regulator of pump performance is known, which contains a differential hydraulic cylinder of a pump capacity control device, the smaller cavity of which is directly connected to the pump pressure line, and the larger one through a control element and with drain line l.

The disadvantage of such a regulator is the difficulty in ensuring its stable operation, especially with a large length of the pressure line and large volumes of fluid in it. Insufficiently high stability of the regulator due to the high sensitivity of the hydraulic booster

and low damping of the controller itself.

The aim of the invention is to improve the stability of the operation of the regulator.

This goal is achieved by the fact that the control element is made in the form of a reduction valve, the high datatype chamber of which is connected to the pressure line, and the reduced pressure chamber is connected to a larger area chamber that is connected to the drain line via a choke.

. A diagram of the automatic control of the pump-throughput performance is shown in the drawing.

Claims (1)

The automatic pressure regulator of the pump contains a differential hydraulic cylinder 1 of the capacity control device 2, the pump 3, the smaller cavity 4 of which is directly connected to the pressure line 5 of the pump 3, and the larger cavity 6 through the control element 7 and the drain hydraulic line 8. Epment 7 of the control is made in the form of a pressure reducing valve, the pressure chamber 9 of its high pressure is connected to the nanometer main 5, and the pressure reduction chamber 1O has a cavity b of a larger area, which Pa connected to the drainage of the hydroline 8 of the transistor throttle 11. The piston 12 of the hydraulic cylinder 1 is connected with the device 2 to adjust the performance of the rod 13, works regulated as follows The fluid flowing from the pressure line 5 into the cavity 4 of a smaller area under pressure, acts on a smaller alescope F, a piston 12, and a liquid coming from the chamber 10 of the reduced pressure of the control element 7; under pressure, Rrel cavity 6 of a larger area acts on. great carpentry gyrushn 12, with part of the fluid through the throttle 11 enters the drain of the hydroline 8. While the pressure in the pressure line is equal to nominal (P), the piston 12 is stationary due to the equality of the forces acting on it. Without regard to friction forces, this equality of forces takes the form of ni ni relaTak as Rred -Cionst regardless of the pressure change in the pressure line 5 (with, b the deviation of the value of Py. ,,, .. from leads to an imbalance of equality of forces acting 1x for 12 So, when the pressure in the pressure line (. P) increases, the force on the piston 12 from side 1 of cavity 4 of a smaller area will be greater than from the larger side 6 and the piston 12 will move to the right, displacing the liquid from cavity 6 of a larger area through a choke 11 to drain the hydroline 8 Move the piston 12 through the rod 13 is transmitted; to the mechanism 2 for controlling the performance of pump 3 and leads to a decrease in the performance of pump 3. A decrease in the performance of pump 3 causes a decrease in pressure in the pressure line 5. The movement of the piston 12 occurs until equality of the forces acting on the piston is restored. 12, i.e., until the pressure pressure is equal to the nominal pressure. As the pressure decreases, the piston 12 moves to the left, displaces the liquid from the smaller cavity 4 into the pressure line 5. The piston 12 will act through the rod 13 on the capacity control mechanism so that the performance of pump 3 will increase and P will increase accordingly. Piston movement 12 m, respectively, the increase in performance of pump 3 will occur until P, ... ,, becomes equal. - this will restore the equality of the str1 acting on the piston 12 (without taking into account the friction forces). Thus, the proposed controller ensures that the pump capacity is 1. 1, without any pressure error. As a result of the action of track forces and resistance, the change in penetration occurs with an error in pressure, but its magnitude is insignificant and comparable to the change in pressure in known devices. In comparison with the known device, in predlagom regups mount significantly higher stability margins due to the absence of highly sensitive spool hydraulic booster, and the presence of more. damping, because the change in dawlani acts on the piston, and not on, the spool. In addition, the spool hydraulic booster, which is more complicated and time consuming to manufacture, was replaced by a simpler reduction valve and the spring in the hydraulic cylinder was eliminated. Claims of the Invention Automatic pressure regulator for pump performance, containing a differential pressure cylinder of a pump performance control device, the smaller cavity of which is connected to the pump discharge line directly, and the larger one through a control element and with drainage line that differs in in order to increase stability, the control element is made in the form of a pressure reducing valve, the high-pressure chamber of which is connected to the pressure line, and the chamber is reduced The second pressure is with a larger chamber, which is connected to the drain through the choke. Sources of information are rinty into account in examination 1, USSR Author's Certificate No. 468О28, cl. F 04B 1 / ZO, 1971.