SU1232845A1 - System of positive-displacement pump delivery regulation - Google Patents

Description

FIELD OF THE INVENTION The invention relates to hydraulic machine building, in particular, to systems for regulating axially porganic machines.

The purpose of the invention is increased reliability and enhanced functionality.

The drawing is a diagram of the control system.

The system for regulating the delivery of the volumetric pump contains an adjustable organ Ij hydraulic booster 2 with hydraulic control with 1m spool 3, automatic reduction unit 4, springs 5 and 6 of the power regulator and pressure feedback plungers 7. The hydraulic booster 2 contains an actuating cylinder 8, connected with an adjustable organ J, a stepped rod with a piston 9, made in one piece, a spring 10. The cavity P of the executive cylinder 8 is connected through channels 12-15 with a paddled spring 3, interacting with the rod 17 fixed on the executive cylinder 8, the cavity 18 is connected to the channel 15, the cavity 9 with a power supply line 20 of the hydraulic booster, the cavity 21 - with the drain line 22. The hydraulic control cavity 23 is connected by a channel 24 through a throttle 25 to a drain line 22. The automatic feed reduction unit 4 comprises a control cylinder 26, which interacts with hydraulically controlled spools 27 and 28 supported on spring 2.9. The hydraulic control cavity 30 of the spool 27 is connected to the cavity 31. The spool 27 has cavities 32-34, the cavity 32 is connected to the drain line 22, the cavity 33 - to the hydraulic control cavity 30, and the cavity 34 - to the control line 35. The spool 28 has a hydraulic control cavity 36, a cavity 37, connected to the tank 38, a cavity 39 connected to the control line 35 and a cavity 40 connected to the channel 24, Cavity 41 Connected to the pump discharge line 42 via a four-way two-way valve 53 controlled from line 44 Two lines 45 and 46 of the operating mode distributor are connected to pressure lines 42 and drain 22, and two other 35 lines from control line 35. With lines 47 and 48, with the cylinder-26 cavity, the hydraulic pump is transferred to the control mode and with the minimum hydraulic supply space 36, the pressure in the control line. The plunger 7 of the regulator of power J42 pumping drops and the spool 28

This is connected to the injection line 42. The pump has a suction line 43

The system for regulating the flow of the volumetric pump operates as follows:

once M

At the beginning of the operation, the distributor 43 modes: the work is in the position shown in the drawing. Liquid under pressure control flows through

SRI 35 control through cavities 39 and 40 into the cavity 23 of the hydraulic control. The spool 3 moves to the left and connects the power line 20 of the hydraulic booster to the cavity 1 through the channels 15, 13 and 12,

At the same time the executive cylinder and

together with it, the adjustable member 1 moves towards increasing the supply, compressing the spring 10 and, through the rod 17, the feedback spring 16 of the spool 3. The spring 16 is compressed until its force exceeds the force acting on the spool from the side of the hydraulic control cavity 23 . Thus, a certain value of the supply corresponds to a certain value of pressure in the control line.

When the discharge pressure exceeds the setting of the springs 5 and 6 of the power regulator, the plunger is activated.

7 S providing a mode of constant power. With a discharge pressure exceeding the maximum pressure that is allowed in the elements of the hydraulic conduit, the automatic feed reduction unit 4 is activated. With a discharge pressure exceeding the maximum operating pressure, the control cylinder moves the spools 27 and 28, connecting the cavity 30

hydraulic control with control line 35 and compartment cavity 23 from the control line. This ensures that regulatory authority 1 of the organization is transferred to the minimum feed mode,

At the same time, control pressure is applied to cavity 30 to hold the spools in the right position,

Ddt pump operation, for example, on the mechanism of rotation platform zkskava-

The torus 43 is moved to another position and the cavity 36 of the control is connected to the injection line 42, Spool 28 is displaced to the right, the compartment 23 of the hydraulic chamber is

I12328454

is shifted to the left, opening the access of the liquid to the turning mechanism,

bones from the control line to the cavity 23 of the hydraulic control., The pump flow increases. Thus, increasing pump performance,

occurs automatically, not exceeding a certain pressure, ensuring the platform rotates at maximum 5 speeds.

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7 S ff / 3 2

ll, 7; 7

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Compiled by I. Ilyin Editor A. Kozoriz Tehred O. Sopko. Proofreader L. Patay

Order 2751/35 Circulation 586 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

VOLUME PUMP FEEDING CONTROL SYSTEM, comprising an actuating cylinder for a pump feed change mechanism, a hydraulic booster with a hydraulic spool connected kinematically by position feedback to a feed change cylinder, an automatic feed reduction unit associated with a hydraulic booster control element, suction, discharge, discharge and control, as well as the power line of the hydraulic booster, and the automatic feed reduction unit has a control cylinder connected to the discharge line It is characterized by the fact that, in order to increase reliability and expand functionality, the automatic feed reduction unit is made in the form of two interacting hydraulic control valves with hydraulic control cavities and is equipped with a two-position four-line operating mode distributor, two lines of which are connected to the lines discharge and discharge, and the other two, respectively, with the control cylinder and one of the hydraulic cavities of the spool of the automatic feed reduction unit, the control line being oedinena control valve with the cavity through one of the hydraulic booster spool automatic reduction of the supply unit, and its other chamber hydraulic control valve associated with the possibility of alternating posts with a drain and a control line through the spool itself. SU „„ 1232845