Limit-quantity charging device and low-temperature vessel comprising same

Abstract

The invention discloses a limit-quantity charging device and a low-temperature vessel comprising the same. The limit-quantity charging device comprises a valve body, a stagnation piece, a floater and a connecting piece, wherein the valve body is provided with a sealed cavity, a liquid inlet arranged on the valve body and a liquid outlet arranged on the top wall of the valve body, the liquid inletis communicated with a liquid inlet tube, and the liquid outlet is communicated with the inner part of the low-temperature vessel; the stagnation piece is arranged in the cavity of the valve body andhas preset weight for sealing the liquid outlet of the valve body; the floater is arranged out of the valve body and can move up and down along with the height of low-temperature medium liquid level in the low-temperature vessel; the connecting piece passes through the liquid outlet of the valve body and is fixedly connected with the stagnation piece and the floater; and the internal diameter of the liquid outlet is more than a preset size of the diameter of the connecting piece. The invention can charge the vessel without discharging the medium in the vessel so as to realize lossless charging, avoid resource waste, lower cost and is favourable for protecting environment.

Description

technical field [0001] The invention relates to a low-temperature container, in particular to a limited filling device for a low-temperature container and a low-temperature container with the same. [0002] Background technique [0003] Cryogenic media such as liquid oxygen, liquid nitrogen, liquid argon, and liquefied natural gas (LNG) are commonly used raw materials in industry. They work cooler and are usually stored in liquid form in cryogenic containers. For example, the operating temperature of liquid nitrogen is usually around -196°C. During the process of filling the container with the liquefied low-temperature medium from the filling source, the medium will continue to vaporize, resulting in an increase in the pressure in the container. This reduces or even eliminates the pressure differential between the container and the filling source, preventing further filling. In addition, excessive pressure in the container will also pose a safety hazard. [0004] Therefo...

AI Technical Summary

Problems solved by technology

[0006] In addition, the existing liquid filling method requires the staff to concentrate on opening and closing the valve of the corresponding pipeline in time

For example, if you forget to open the full test valve 4 when filling, the liquid in the container may exceed the safe liquid level, which may cause dangers such as pressure suffocation and tank explosion.

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