SU177722A1 - DEVICE FOR PROTECTION OF HYDRAULIC SYSTEMS FROM - Google Patents

Description

The known devices for protecting the hydraulic system from water hammer, starting with an increase in pressure, consist of a hydraulic cylinder divided by a diaphragm cavity, a drain clan, rigidly connected to the piston, and a spring-loaded impulse valve with which the drain valve is controlled.

The proposed device allows separating the pressure control point on the slurry pipe from the water discharge point (at the water line), for which a pulse valve with a spring-loaded piston is connected to the slurry pipe, at the pressure level in which this valve drains water from the upper chamber of the hydraulic cylinder, thereby opening drain valve and discharge of water from the conduit. In order to use the pressure in the nose for closing the drain valve after discharge of water from the water conduit and to ensure the specified closing time of this valve, the hydraulic cylinder is divided by two cross-flow diaphragms and a rigid partition installed between them with a built-in non-return valve and adjustable throttle. In this case, the lower diaphragm is connected to the drain valve stem, the cavity above the upper diaphragm is connected to the water conduit through a tube, and the cavities between the diaphragms are filled with oil.

the described device; in fig. 2 is a diagram of its connection to pipelines.

The device consists of a hydraulic cylinder 1, in which the piston 2 is placed, rigidly connected to the drain valve 3. The cylinder cavity with diaphragms 4 and 5 and the partition 6 is divided into chambers 7, 8 and 9. The check valves 10 and the adjustable throttle P. are built in the partition. 7 through

pulse valve 12 is connected to the drain pipe 13. The valve 12 is rigidly connected to the piston 14, which is under the influence of the spring 15 and the pressure in the slurry pipe 16, to which the branch pipe 77 is connected.

7 via a tube 18 communicates with a nozzle 19 connected to the conduit 20. When the valve 3 is opened, the nozzle 19 is connected to the drain pipe 21. The chambers 8 and 9 are filled with oil, the chamber 7 with water.

When the pressure in the slurry pipeline increases, a pulse valve opens, and water from chamber 7 is discharged through drain pipe 13. The pressure in this chamber drops, resulting in oil from chamber 9

under the influence of the piston 2 flows through the valves 10 into the chamber 8. The drain valve opens and the water starts to flow from the nozzle 19 into the drain pipe 21. The static pressure of the water in the nozzle decreases,

yes from this chamber vygnesn ts in the pipeline

The impeller valve closes under the influence of the spring 15, and the chamber 7 is filled with water entering through the tube 18. Under the pressure of this water, the oil from the chamber 5 enters the chamber 9 through an orifice in the adjustable throttle. Under the influence of oil, the piston 2 moves downwards, closing the drain valve. Its closure time is determined by the hole in the choke.

Thus, at the moment of pressure increase in the pipeline, the valve 3 automatically opens, connecting the water line to the drain. At the same time, the pressure surge wave moving along the slurry pipeline, in the area of chamber 22, encounters a pressure decline wave coming from the water line due to the opening of the valve. Having formed, these waves smooth out the hydraulic impact in the pipeline under the chamber. In addition, due to the opening of the drain valve, there is no further increase in shock pressure in the main pipeline.

Subject invention

Claims (2)

1. A device for protecting a hydraulic system from water hammer, starting with an increase in pressure, including a hydraulic cylinder, divided by a diaphragm, a drain valve rigidly connected to the piston, and a spring-loaded pulse valve, by means of which the drain valve is controlled, characterized in that separation of the pressure control point in the slurry pipeline from the point of water discharge (on the water line), a pulse valve with a spring-loaded piston connected 0 with a slurry duct, with an increase in pressure in which this valve drains water from the tops of the cylinder of the hydraulic cylinder, thereby ensuring the opening of the drain valve and the discharge of water from the water conduit. 2. An apparatus according to claim 1, characterized in that, in order to use the pressure in the conduit to close the drain valve after the water is discharged from the conduit and provide the specified closing time for this valve, the hydraulic cylinder is divided by two transverse diaphragms and a rigid partition installed between them with embedded there is a check valve and an adjustable throttle in it, the lower diaphragm is connected to the drain valve stem, the cavity above the upper diaphragm is connected to the conduit through a tube, and the cavities between the diaphragms filled with butter. GI Y / 7 /// 7 /// 7/7 //// j /// 6 20 ig2