PROTECTION SYSTEM FOR CRYOGENIC TANKS LOCATED INSIDE THE HULL OF AN UNDERWATER VEHICLE Russian patent published in 2022 - IPC F16K17/10 

FIELD: cryogenics.

SUBSTANCE: invention relates to cryogenic technology and can be widely applicable for protection of cryogenic tanks and vessels included in systems for storage of liquid oxygen and hydrogen, used for operation of electrochemical generators and mounted inside the hull of underwater vehicles. The system comprises a safety valve and a pulse valve, installed outside the hull of the underwater vehicle, wherein the safety valve is made of two bodies, and the first body is secured on the outside of the hull of the underwater vehicle through a lining pad and a power drive in the form of a spring and two parallel bellows is installed therein. The second body is mounted inside the hull of the underwater vehicle, and a seat and a shutoff valve connected by a rod with a power drive are installed therein, wherein the cavity above the shutoff valve is connected with the gas cushion of the cryogenic tank via a cryogenic pipeline, and the cavity after the shutoff valve is connected with a check valve additionally installed on the outside of the hull of the underwater unit via a pipeline. The body and the pipeline are surrounded by a casing for the heat carrier. A valve opening locking apparatus is mounted on the body of the pulse valve, wherein the cavity of the locking apparatus is connected with the water surrounding the underwater vehicle via a pipeline passing in the hull of the underwater vehicle. The body of the pulse valve and the first body of the safety valve are located in a chamber secured on the hull of the underwater vehicle through a lining pad, connected with the gas cushion of the cryogenic tank via a pipeline and filled with a liquid at 90 to 95%, wherein the valves operate from the pressure of the gas cushion in the cryogenic tank through said liquid. In the first body of the safety valve, the effective area of the internal bellows of the power drive is 2 to 10 times greater than the sealing area of the shutoff valve mounted in the second body. The inter-bellows cavity of the power drive is connected with the inner volume of the underwater vehicle. The pulse valve is made in a single body, and a seat and a valve for working medium supply, a seat and a valve for working medium relief are installed therein, and mounted on the upper part of the body is a control apparatus made in the form of a cylindrical chamber wherein a bellows with a spring and a rod are placed. The rod is passed through the valve for working medium relief, and two stops are made on the rod, wherein the valve for working medium relief and the valve spring are located between said stops. A rod seal is installed in the valve, and the cylindrical chamber itself is connected with the liquid-filled chamber via a pipeline, the open end whereof is distanced at 5 to 10 mm from the hull of the underwater vehicle, and the valve opening locking apparatus is mounted on the lower part of the body of the pulse valve, made in the form of a cylindrical chamber, bellows, and a rod interconnected with the valve for working medium supply. The effective area of the bellows is equal to the setting area of the valve for working medium supply. The cavity between the valves supply and relief of the working medium is connected to the cavity of the safety valve, located between the first body and the external bellows of the power drive, and the cavity after the valve for working medium relief is connected to the container installed inside the liquid-filled chamber, equipped with a pump, and connected with the internal volume of the underwater vehicle.

EFFECT: invention allows for a simple, safe to operate, and easy to repair system for protecting cryogenic containers and tanks placed inside the hull of an underwater vehicle.

1 cl, 1 dwg