Long-acting storage tank for indoor liquid nitrogen fire extinguisher

Abstract

The invention relates to the field of fire control equipment, in particular to a liquid nitrogen fire extinguisher. A long-acting storage tank for an indoor liquid nitrogen fire extinguisher comprises an outer tank body and an inner tank body. A sealing cover is arranged on the top of the outer tank body and the top of the inner tank body to enable the part between an outer thermal insulation layer and an inner thermal insulation layer to become a vacuum chamber. A thermal insulation pad is arranged between the bottom of the outer tank body and the bottom of the inner tank body. An outlet pipe and the vacuum chamber are communicated through a relief valve. A vacuum pump is arranged outside the outer tank body. The vacuum pump is communicated with the vacuum chamber through a pipeline. The vacuum pump is provided with a vacuum meter and a controller. The vacuum meter inputs signals to the controller, and the controller is connected with the vacuum pump through control. During pressure releasing each time, released nitrogen can be utilized for cooling the thermal insulation layers, the controller carries out vacuumizing on the vacuum chamber again according to the data of the vacuum meter after pressure releasing discharge, and the thermal insulation capability of the tank bodies cannot be affected. By means of calculation, the expiration date of the liquid nitrogen fire extinguisher can be prolonged by about 2-5 times, and the practicability of the liquid nitrogen fire extinguisher is greatly improved.

Description

technical field [0001] The invention relates to the field of fire fighting equipment, in particular to a liquid nitrogen fire extinguisher. Background technique [0002] Portable mobile fire extinguishers in existing firefighting equipment are usually sprinkler fire extinguishers, dry powder fire extinguishers, carbon dioxide fire extinguishers or foam fire extinguishers. These fire extinguishers are usually not a big problem for conventional fires or fires with specific substances, but for special chemical fires, they often It will support combustion and even cause an explosion. Therefore, for chemical laboratories or hazardous chemical storage sites, a broad-spectrum fire extinguisher is needed to ensure safety. [0003] The existing broad-spectrum fire extinguisher with the best effect is liquid nitrogen fire extinguisher, but liquid nitrogen fire extinguisher has not been popularized and applied, because this kind of fire extinguisher has limited thermal insulation and s...

AI Technical Summary

Problems solved by technology

[0002] Portable mobile fire extinguishers in existing firefighting equipment are usually sprinkler fire extinguishers, dry powder fire extinguishers, carbon dioxide fire extinguishers or foam fire extinguishers. These fire extinguishers are usually not a big problem for conventional fires or fires with specific substances, but for special chemical fires, they often It will support combustion and even cause an explosion. Therefore, for chemical laboratories or hazardous chemical storage sites, a broad-spectrum fire extinguisher is needed to ensure safety.

[0003] The existing broad-spectrum fire extinguisher with the best effect is liquid nitrogen fire extinguisher, but liquid nitrogen fire extinguisher has not been popularized and applied, because this kind of fire extinguisher has limited thermal insulation and sealing ability due to the limited volume of the tank, and the leakage of nitrogen gas is large. , leading to a very short shelf life, usually no more than 48 hours, this kind of storage cost is obviously impossible to be accepted by users, so it can only be applied in the most advanced laboratories or factories with large liquid nitrogen storage tanks that can produce liquid nitrogen themselves, and cannot Meet the needs of ordinary users

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