SU1315668A1 - Pressure pulse generator - Google Patents

Abstract

Invention m. used in testing equipment as a drive for pneumatic pumps and pneumatic tools. The purpose of the invention is to expand the functionality by increasing the amplitude of the pressure pulsations and smoothly adjusting the oscillation frequency. In vsasy. W 7 ZU lif I g 18 21 10 (L

Description

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1) movable walls 18, 19 with displacement adjusters 21 and axial bores 20 are installed. The spool valve is made in the form of a piston with a rod 24, the free end of which with a locking element 3 fixed on it placed in the control cavity (UE) 7. The suction inlet 17 of the vortex chamber 9 of the dynamic device is connected to the pressure relief cavity

The invention relates to devices for generating pressure pulses and can be used in testing equipment as a drive for pneumatic pumps and pneumatic tools.

The purpose of the invention is to expand the functionality by increasing the amplitude of the pressure pulsations and smoothly adjusting the oscillation frequency.

The drawing shows a diagram of the pulse generator.

The generator contains a spool valve 1 with shut-off elements 2 and 3, mounted in housing D with the formation of a pressure relief cavity 5 and control cavities 6 and 7, and a dynamic device in the form of vortex chambers 8 and 9 with inlet pipes 10 and 11 connected with the pressure source, the outlet nozzles 12 and 13 connected to the users 14 and 15, and the suction nozzles 16 and 17 connected to the cavity 15 through the valve 1. The nozzles 16 and 17 have movable walls 18 and 19 with an axial bore 20 and displacement regulator 21 forming diffuser slots 22 and 23. The suction port 17 is connected to the cavity 5 through the diffuser slot 23 and the control cavity 7 in which the rod 24 is placed, on which the locking element 3 with the collar 25 is fixed. The control cavity 6 is connected to the outlet pipe 13 via check valves 26

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via the UE 7. The UE 6 is connected to the outlet 13 of the chamber 9 through two parallel-connected and oriented in opposite directions check valves 26,27 with adjustable throttles 28, 29. Separate control of the duration of the periods of increase and decrease in pressure by throttles 28 and 29 allows, in addition to changing the frequency, the pulsations, to smoothly change the shape of the oscillations. 1 il.

and 27 with adjustable throttles 28 and 29, mounted in parallel and oriented in mutually opposite directions. On wall 19

fixed elastic pad 30.

The device works as follows.

The compressed gas from the source is supplied to the inlet nozzles 10 and 11 of the vortex chambers 8 and 9 located in the composite casing 4. In the position shown in the drawing, the locking element 3 closes the connection between the control cavity 7 and the pressure relief cavity 5, and the vortex chamber 8 associated with the cavity 5. This reduces the pressure in the cavity of the consumer 14 due to the outflow of gas through the outlet 12,

the axial zone of the vortex chamber 5 and the diffuser slot 22. The rotation of the expanding gas supplied through the inlet 10 into the vortex chamber 8 accelerates the process of emptying the cavity of the consumer 14 to the pressure in the suction nozzle 16 and the cavity 5 of the pressure relief. In addition, the possibility of vacuuming the cavity of the user 14 is achieved.

below ambient pressure due to the vacuum in the outlet 12.

Simultaneously with a decrease in pressure in the cavity of the consumer 14, an increase in the pressure in the cavity of the consumer 15 occurs. Since, with the closed locking element 3, all the gas is.

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supplied from the pipe 11, expires through the pipe 13, part of the gas through the check valve 27 and the adjustable throttle 29 penetrates into the control cavity 6 and leads to a gradual increase in pressure. The cross-sectional area of the locking element 2 is larger than the cross-section of the locking element 3, therefore, it opens and the pressure in the cavity 7 drops to a level close to the ambient pressure. Due to the energy of the compressed gas accumulated in the cavity 6, the locking element 2 abruptly moves as far as the stop of the annular protrusion 25 of the locking element 3 into the elastic pad 30. The impact energy of the locking element 3 is quenched due to the compression of the strut 30 and the regulators 21, which also serve for smooth adjustment of the vacuum value developed in the axial zone of the vortex chambers 8 and 9 in the outlet nozzles 12 and 13 by changing the width of the slots 22 and 23 by adjusting the 2 1,

When the vortex closure member 3 is open, chamber 9 comes into vacuum mode. Due to the pressure difference between the strip 7 and the cavity formed by the annular protrusion 25, communicated through the hole 20 with the axial zone of the vortex chamber 9, the locking element 3 is pressed against the elastic plate 30. The piston is fixed in the extreme position shown in the drawing with a dashed line. In this position, the piston overlaps the connection of the vortex chamber 8 with the reset cavity 5

pressure. When this occurs, Q will expire, in addition to a change in the frequency of the gas from the consumer’s cavity 15, followed by vacuuming and an increase in pressure in the cavity of the consumer 15 due to the ingress of gas through the inlet 10 and outlet 12. As the pressure in the cavity of the consumer 15 decreases, Vacuuming the cavity 6 through the non-return valve 26, and the adjustable throttle 28 of the adjustments of the throttles 29 at the same time does not affect the duration of the vacuum period in the chamber 6, since the non-return valve 27 in this mode Covered. As the pressure in the cavity 6 decreases, the difference in pressure on the walls of the piston increases, since the pressure in cavity 5 remains constant and equal to the atmospheric pressure. Nastu45

50

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oscillations will change smoothly.

Claims (1)

Invention Formula A pressure pulse generator containing a controlled spool valve with two shut-off elements installed in the housing to form a pressure relief cavity and two control cavities, and a dynamic device whose inlets are connected to a pressure source, the output is with a consumer, and the suction a cavity of pressure relief through the spool valve, which is the fact that, in order to expand its functionality by increasing the amplitude, the bulging annular protrusion 25 to the elastic lining 30 is insufficient to keep the locking element 3 in the open position. The locking element 3 is detached from the cover 30 and moves together with the locking element 2 to the extreme right position. Under the action of increasing pressure in the pipe 7, the locking element 3 is pressed against the seat and fixed in this position. At the same time, the locking element 2 is opened, and the vortex chamber 8 is again transferred to the vacuum mode and the device returns to its original position. The beginning of the cycle is conditionally accepted, since the device is capable of self-starting in any of the positions of the locking element 2. with fO 15 20 25 The installation is operable even in the absence of the locking element 2 and the associated vortex chamber 8. The proposed device creates gas pulsations in the range from the maximum pressure of the X-ray laser, PKS to the minimum pressure P „„ „. The value of PMYKS can be selected in the range of 30 from (D ° (), where P is the pressure of compressed gas, P is the ambient pressure, 1 ... 0.3 AT is the differential pressure to ensure reliable valve switching. An important advantage of the device is the separate control of the duration of the periods of increase and decrease in pressure by the chokes of 28 and 29, respectively. This is pos35 five 0 five oscillations will change smoothly. Invention Formula A pressure pulse generator containing a controlled spool valve with two shut-off elements installed in the housing to form a pressure relief cavity and two control cavities, and a dynamic device whose inlets are connected to a pressure source, the output is with a consumer, and the suction a cavity of pressure relief through a spool valve, which is designed so that, in order to expand its functionality by increasing the amplitude of the bullet, 13156686 pressure and smooth adjustable end of the rod with fixed oscillation frequency, it is equipped with it with the possibility of overlapping, by means of sliding walls with a regulating orifice, one of the locking electro-displacement and axial openings, of the spool valve, with The control chamber installed in the suction pads of the friend with the formation of a diffuser washer with the outlet pipe of the said slits, a spool valve made a whirl chamber through two complementing the form of a piston with a rod, and a dynamically installed reverse valve device made with adjustable throttles, twisted vortex chambers, suction pat-10 than check valves with throttles logs of one of which are connected with parallel-connected one with respect to pressure relief through the control of the other and are oriented in there is a cavity in which the opposite directions are placed.