SU909356A1

SU909356A1 - Apparatus for smoothing pulsations of liquid flow

Info

Publication number: SU909356A1
Application number: SU802874836A
Authority: SU
Inventors: Мойсей Шаевич Рабинович; Леонид Давыдович Ноткин; Николай Романович Васильев; Виктор Александрович Борщевский
Original assignee: Научно-Исследовательский Институт Технологии Криогенного Машиностроения
Priority date: 1980-01-25
Filing date: 1980-01-25
Publication date: 1982-02-28

Description

1one

Изобретение относитс к машиностроению , в частности к устройствам дл сглаживани пульсаций давлени , и может быть использовано в гидравлических системах, например, дл сглаживани пульсаций давлени потока низкотемпературной жидкости после поршневого насоса,, в частности при дальнейшем направлении его в объемный дозатор.The invention relates to mechanical engineering, in particular to devices for smoothing pressure pulsations, and can be used in hydraulic systems, for example, to smooth out the pressure pulsations of a low-temperature liquid stream after a piston pump, in particular, with its further direction into a volumetric metering device.

Известно устройство дл сглаживани пульсаций давлени потока жидкости, содержашее сосуд с поршнем и устройством управлени положением поршн , и каналы подвода и отвода рабочей жидкости 1 .A device for smoothing pulsations of the pressure of a fluid flow, containing a vessel with a piston and a device controlling the position of the piston, and channels for supplying and discharging the working fluid 1 is known.

Недостатком известного устройства вл етс то, что оно позвол ет сглаживать пульсации только при посто нстве среднего значени давлени жидкости либо при незначительном его изменении.A disadvantage of the known device is that it allows smoothing pulsations only when the mean value of the fluid pressure is constant or when it is slightly changed.

Цель изобретени - расширение функциональных возможностей устройства.The purpose of the invention is to expand the functionality of the device.

Указанна цель достигаетс тем, что устройство снабжено пропорциональным регул тором , регулирующим прибором, датчиками давлени , один из которых установлен в верхней части сосуда, другой - в нижней части сосуда, а третий - в канале подвода.This goal is achieved by the fact that the device is equipped with a proportional regulator, a regulating device, pressure sensors, one of which is installed in the upper part of the vessel, the other in the lower part of the vessel, and the third in the supply channel.

а устройство управлени положением поршн выполнено в виде двух исполнительных механизмов и рычага, одно плечо которого кинематически св зано с исполнительными механизмами, а другое плечо - с поршнем.and the piston position control device is made in the form of two actuators and a lever, one arm of which is kinematically connected with the actuators, and the other arm with the piston.

Кроме того, один из исполнительных механизмов кинематически св зан с рычагом через пружину и электрически - с датчико1у1 давлени , установленным в нижней части сосуда через пропорциональный In addition, one of the actuators is kinematically connected to the lever via a spring and electrically to the pressure sensor 1 installed in the lower part of the vessel through proportional

10 регул тор, а второй исполнительный механизм , выполненный в виде электромагнита с подвижным сердечником, кинематически св зан через сердечник с рычагом и электрически - с датчиками давлени , один из 15 которых установлен в верхней части сосуда, а другой - в канале подвода, через регулируюш ,ий прибор.10 is a regulator, and the second actuator, made in the form of a moving-core electromagnet, is kinematically connected through a core with a lever and electrically - with pressure sensors, one of 15 of which is installed in the upper part of the vessel, and the other in the supply channel , device

На чертеже представлена схема устройства .The drawing shows a diagram of the device.

Устройство дл сглаживани пульсаций Pulsation smoothing device

Claims

The 20 fluid flow pressure contains a vessel 1 with a piston 2 and a control device for the position of the piston 2, made in the form of actuators 3 and 4 and a lever 5, one arm 6 of which is kinematically connected with actuators 3 and 4, and the other arm 7 with a piston

2. The kinematic coupling of the actuator 3 with the lever 5 is made in the form of a spring 8, and the actuator 4 is made in the form of an electromagnet 9 with a moving core 10 connected to the lever 5. In addition, the actuator 3 is electrically connected with the pressure sensor 11 installed in the lower part of the vessel 1 through the proportional regulator 12, and the actuator 4 with the pressure sensor 13 installed in the upper part of the vessel 1 and with the pressure sensor 14 installed in the channel 15 for supplying the working fluid through boron 16. The vessel 1 is also provided with a channel 17 for discharging the working fluid. The spring 8 of the actuator 3 is connected to its movable member 18. The arm 7 of the lever 5 is connected to the piston 2 by the rod 19. The device operates as follows: The fluid is supplied by a pump (not shown) to the vessel 1 through the supply channel 15, and a flow pulsation occurs. the increase in pressure at each pulsation is greater than its drop, and the average pressure of the flow increases. With growth. pressure sensor 11 pressure signal corresponding to the pressure in the vessel I, the proportional regulator 12, and that - the corresponding signal to the actuator

3. As a result, the actuator 3 affects the spring 8. In this case, the spring 8 is somewhat stretched, and with further movement of the movable member 18 of the actuator 3, it acts through the lever 5 on the piston 2, trying to keep it in the same position., At the same time, the sensor 14 pressure sends to the regulating device 16 a signal corresponding to the pressure in the supply channel 15 at the moment, and the pressure sensor 13 sends to the same regulating device 16 a signal corresponding to the pressure value in the vessel 1. The pressure in s The vessel 1 measured by the pressure sensor 13 is less than the pressure in the supply channel 15 measured by the pressure sensor 14, since the section (volume) of the vessel 1 is much larger than the section of the channel 15, and the measuring point is removed from the pressure source (pump). As a result, the control device 16 sends a signal to the electromagnet 9, which is proportional to the difference between the pressures of the pressure sensors 14 and 13. Sign of the signal with a growth of negative. This signal determines the voltage on the electromagnet 9 it is decreasing. At the same time, the core 10 is mixed (extended), and the piston 2 connected with it by means of the shoulder 6, the lever 5 and the rod 19 moves upward, increasing the volume (Zrsuda I, i.e. reducing the pressure increase in the vessel 1 (the spring 8 additionally expands by a certain amount.) As a result, over time, the difference between the magnitudes of the signals from the pressure sensors 14 and 13, and hence the magnitude of the signal from the regulating device 16, will increase. Accordingly, the voltage on the electromagnet 9 will also increase and, consequently, displacement value neither the piston 2 preventing the pressure growth in the vessel 1. Therefore, the pressure in the vessel 1 does not increase in accordance with the pressure increase in the channel 15 (as it would if the actuator 3 was affected only by the actuator 3), but by a much smaller value. At the next pressure drop in the channel 15, the actuator 3 under the action of a signal from the proportional regulator 12 also exerts a corresponding pressure value in the vessel 1 through the spring 8 on the piston 2, and the adjustable device 16 sends to the electromagnet 9 a signal proportional to the difference between the pressures of the pressure sensors 14 and 13. However, the sign of the signal is positive. As a result, the voltage on the electromagnet 9 increases, the core 10 is retracted, and the piston 2 moves downward, reducing the volume of the vessel 1 (the spring 8 is somewhat compressed). Since the pressure difference in vessel 1 and in channel 15 is very significant at this time, piston 2 moves so much that as a result of a decrease in volume of vessel 1, the pressure in it will not only not fall, but will increase at the same rate. Similar processes will occur with further increases and decreases in YES in channel 15. Thus, the pulsations are smoothed and the pressure in vessel 1 smoothly increases. Accordingly, the pressure increases in the channel 17 of the fluid outlet. As an actuator that measures the position of the piston 2, not only the electromagnet can be used, but also, for example, a linear motor. Thus, the proposed device provides smoothing of the pulsations of the fluid flow with the growth (fall) of the mean sign-. pressure in the system in a wide range. Claims 1. A device for smoothing pulsations of a fluid flow pressure, comprising a vessel with a piston and a piston position control device, characterized in that, in order to expand its functionality, it is equipped with a proportional regulator, a regulating device.