SU1245792A1 - Control device for actuator of valve for damping hydraulic shocks - Google Patents

Description

The invention relates to mechanical engineering and can be used in the petrochemical industry, heat supply and sewage.

The aim of the invention is to increase the efficiency of the device by allowing it to be repeatedly triggered.

The drawing shows a valve actuator control device for damping hydraulic shocks.

The device is installed on line 1 with a pump 2 and a check valve 3. The device contains a tank 4 with a bellows separator 5 and a tank 6 with a bellows separator 7. The tanks 4 and 6 communicate with each other through pipes 8 and 9 through a check valve 10 with a throttle. Capacity 4 is connected to line 1 to the check valve 3 with the help of pipe 11 with valve 12, and tank 6 is connected to line 1 after the check valve 3 with help of pipe 13 with valve 14. The containers 4 and 6 are connected with pipe 15 with an internal cavity bellows separator 16 valve 17.

The valve 17 contains a partition 18, which divides its internal cavity into cavities 19 and 20, and the cavity 20 is in common with the atmosphere by the opening 21.

The end of the bellows separator 16 is rigidly connected by the stem 22 to the valve closure body 23 of the valve 17. The stem 22 is placed in the guide sleeve 24. The locking body 23 separates the inlet 25 nozzle from the drain 26 nozzle.

Differential cylinder 27 contains bellows separators 28 and 29, the movable ends of which are rigidly connected by rod 30, and the end of the bellows separator 28 has a diameter larger than the end of the bellows separator 29. The internal cavity of the separator 28 is in communication with the capacity 4 of the pipeline 8, with a capacity of 6 pipe 9 and valve 17 - pipe 15.

The internal cavity of the separator 29 is communicated by pipeline 31 through a check valve 32 to a choke with a capacity of 6. A cavity 33 of the differential cylinder, located between bellows separators 28 and 29, is in communication with the atmosphere through an opening 34. The container 6 is connected by pipeline 35 to pipelines 9 and 15 through the check valve 10. Behind the return (downstream) valve 3, the valve 36 is installed. The ratio of the areas of the end faces of the bellows separators 28 and 29 is chosen equal to the ratio of the areas of the end of the bellows. the divider 16 and the valve body 23; the sum of the areas of the inlets of the pipelines 8 and 9 in the inner cavity of the bellows separator 28 is equal to the end area of the bellows separator 29. The internal cavities of the bellows dividers 5, 7, 16, 28 and 29, as well as the pipe

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wires 8, 9, 15, 31 and 35 are filled with an anticorrosive working fluid in such a way that after starting pump 2 and opening all valves, the bellows separators 7, 16 and 28 are maximally stretched, and dividers 5 and 29 are compressed.

In this state, the device is ready for operation and is shown in the drawing by solid lines.

The device works as follows.

When the pump 2 is turned on, the pressure in the pipe 1 drops and the check valve 3 closes. At the same time, the pressure on the pipeline section 1 to the check valve 3, as well as in the pipeline 11 and in the internal cavity of the container 4 continues to decrease, and on the pipeline 1 section after the check valve 3, in the inlet 25, in the pipeline 13 and in the internal cavity of the container 6 after the return of the reflected wave begins to rise.

A decrease in pressure in the internal cavity of the container 4 leads to a decrease in pressure in the internal cavities of the bellows separators 5, 28 and 16, as well as in the pipes 8, 9 and 15 connecting these cavities. At a certain ratio of pressures in the pipeline 1 on both sides of the check valve 3, the force on the locking body 23 of the valve 17 becomes greater than the force on the end of the bellows separator 16, the locking body 23, moving up, opens the opening of the inlet 25, resulting in discharge of fluid from the pipeline 1 after the check valve 3 through the drain pipe 26.

When the valve 17 is opened, the working fluid from the internal cavity of the bellows separator 16 through the pipelines 15 and 9 through the cavity of the bellows separator 28 and the pipeline 8 flows into the internal cavity of the bellows separator 5. At the same time the bellows separator 16 is compressed and the separator 5 is expanded. Simultaneously with the opening of the valve 17 under the action of the increased pressure in the internal cavity of the container 6, the bellows separator 7 begins to compress, squeezing the working fluid through pipelines 35 and 9, and through the bellows separator 28 and pipeline 8 into the internal cavity of the bellows separator 5, and through pipeline 31 - into the internal cavity of the bellows separator 29. The check valves 10 and 32 are closed and the flow of working fluid flows through the throttle openings in these valves.

As the working fluid is filled, the bellows separator 29 expands and the separator 28 contracts, squeezing the working fluid through conduit 8 into the internal cavity of the bellows separator 5. After opening the valve 17, the end of the bellows separator 28 tightly blocks the inlets of the pipelines 8 and 9, so

as their areas are equal to the area of the end of the bellows separator 29, and the pressure in the internal cavity of the latter is greater than the pressure in pipelines 8 and 9. The shut-off time is regulated by selecting the diameter of the throttle hole in the check valve 32.

The overlap of the inlet of the pipe 9 in the inner cavity of the bellows separator 28 causes the working fluid from the internal cavity of the bellows separator 7 to flow into the internal cavity of the bellows separator 16 of the valve 17, increasing the pressure in it to its value in the pipe 1 after check valve 3. Since the area of the end face of the bellows separator 16 is larger than the area of the valve body 23 of the valve 17, the latter is gradually closed and the discharge of fluid from the pipeline 1 is stopped. The closing time of the valve 17 is controlled by adjusting the diameter of the hole in the throttle of the check valve 10 so that no secondary hydraulic shock occurs in the pipeline 1.

Increasing the pressure in the internal cavity of the bellows separator 16 and in the pipeline 15 causes an increase in pressure in the pipeline 9. However, since the area of the inlet of the pipe 9 in the internal cavity of the bellows separator 28 is less than the end face of the bellows separator 29, after closing the valve 17 the pipelines 8 and 9 remain tightly closed with the end face of the bellows separator 28.

The position of the elements of the device after closing the valve 17 is shown in the drawing by dotted lines.

After starting the pump on the open back valve 36, the check valve 3 opens and the pressure in the pipeline 1 to the check valve 3 by the amount of losses in the check valve 3 and the valve 36 becomes greater than the pressure in the pipe 1 after the return 5

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valve 3. This pressure is transferred through line 11 into the internal cavity of the tank 4, compressing the bellows separator 5 and increasing the pressure in the pipeline 8. The bellows separator 28 expands and the separator 29 compresses. At the same time, the internal cavity of the bellows separator 28 is mainly filled with working fluid from the internal cavity of bellows separator 5, and the working fluid from the internal cavity of bellows separator 29 is almost completely squeezed into the internal cavity of the bellows separator 7 and only a small part of the working fluid through the choke of the check valve 10 is overloaded into the internal cavity of the bellows separator 28.

The flow of the working fluid through the pipeline 35 is carried out through the open flow check valve 10. After opening the inlets of the pipes 8 and 9 in the internal cavity of the bellows separator 28, the device is ready for re-action. This is ensured by appropriate selection of the volumes of the internal cavities of the bellows separators 7 (stock of working fluid is stored) and 5 (new portions of the working fluid can be received when the device is triggered).

At the end of the working fluid flowing from the internal cavity of the bellows separator 29 into the internal cavity of the separator 7, it begins to flow from the separator 5 through the pipeline 8, the bellows separator 28 and the pipelines 9 and 35 into the internal cavity of the separator 7. The check valve 10 opens with the liquid flow.

After some time after starting the pump 2, if the device does not work again, all the working fluid flows from the cavity of the separator 5 into the internal cavity of the separator 7 and all elements of the device occupy the initial position.

Claims (1)

VALVE DRIVE CONTROL DEVICE FOR EXTINGUISHING HYDRAULIC SHOCKS in the main with pump and non-return valve, containing two communicating with each other through a non-return valve with an orifice and with a valve valve actuator with flexible dividers, one of which is connected to the main to the non-return valve, and the other after it , characterized in that, in order to increase the efficiency of the device by ensuring the possibility of its repeated operation, it is additionally equipped with a differential cylinder with two bellows section telyami different diameters, the larger diameter cavity of the bellows of the separator is in communication with the valve actuator and capacitances smaller diameter cavity - through the additionally installed with a throttle check valve with the container, connected after the check valve, and the differential cylinder chamber delimited between the bellows - the atmosphere. SU, „. 1245792