SU850950A1 - Hydraulic pulsator - Google Patents

Description

(54) HYDRAULIC PULSATOR

The invention relates to tests for testing automatic control systems for engines and, in particular, to hydraulic pulsators. A hydraulic pulsator is known comprising a housing with a control spool in which interconnected T-shaped canals connected to jets, end cavities, discharge and drain channels 1 are known. A disadvantage of the known device is the impossibility of its use in a wide range of test objects. The purpose of the invention is the expansion of functional capabilities. This goal is achieved by the fact that in the housing with the formation of the control of cavities, an additional bypass spool is installed, concentrically covering the control spool and provided with a spring and internal groove for communication of T-shaped channels, one of the end cavities of the control spool is connected to one of the control cavities, the bypass valve spool with a throttling element installed in it, and the nozzles are installed in the drain channels,. . The drawing shows a schematic diagram of the proposed pulsator. The hydraulic pulsator comprises a housing 1 with a control spool 2 equipped with T-shaped channels 3 and 4, which communicate with the jiggler 5 and 6 with end cavities 7 and 8. In case 1, pressure 9, 10 and drain 11, 12 and 13 channels are made and the control cavities 14 and 15 are formed by installing the bypass spool 16, which is compressed by the spring 17 and provided with an internal point 18, and the end cavity 7 of the control spool 2 is connected with. the control cavity 14, the channel 19 with the throttling valve element 20 installed therein. At the outlet of the drain channel 13 in front of the orifice 6, the switching device 21 is mounted. To adjust the amplitude of the output signal P, the adjustment screw 22 serves as the upper stop of the control spool 2. In the end cavity 7 a spring 23 is placed. A constant pressure is supplied to the transfer spool 16 via the throttling element 24.

Hydraulic pulsator works as follows.

. In the initial position, the switch-on device 21 is open. The control valve 2 under the action of the command pressure P | is in the upper position with an emphasis on the adjusting screw 22, and the bypass boltman 16 is installed in the extreme upper position under the action of the spring 17 When the hydraulic pulsator is turned on, the drain channel 13 is closed by the switch-on device 21. In the upper end cavity 7 of the control spool 2, the pressure of the working fluid flowing through the T-shaped channels 3 and 4, the internal bore 18 increases, and the control spool 2 moves downwards. At the same time, in the control cavity 14 of the bypass spool 16, the pressure of the working fluid flowing through the flange 19 and the throttling element 20 increases. The bypass spool 16 begins to move downwards following the controller. spool 2. When the bypass spool 16 moves relative to the control spool 2, a T-shaped channel is covered, channel 4, the pressure drops in the end cavity 7 of the control spool 2 and it begins to move upward under the action of the command pressure P. to meet the reset spool 16. In this case, the T-shaped channel 4 overlaps, and pressure drops in the control cavity 14 of the bypass valve 16, with the result that the bypass valve 16 moves upward under the action of the spring 17.

When the bypass spool 16 moves upwardly with respect to the control spool 2, the T-channel 4 is slightly opened, the pressure of the working fluid increases in the end cavity 7 of the control spool 2 and the control spool 2 moves down towards the bypass valve 16, opening the T-channel 4 sharply , increases the pressure of the working fluid in the control cavity 14 of the spool 16 bypass. The bypass spool 16 moves down and the oscillation cycle repeats.

During oscillatory movement of the bypass spool 16, the output signal is periodically fed through the discharge channel 10 to the test object (not shown).

Claims (1)

1. The patent of Germany 2038424, cl. 60 a 21/12, 1972.