Limited filling device, low-temperature container with same and filling method

Abstract

The invention discloses a limited filling device, a low-temperature container with the same and a method for filling a low-temperature medium into the low-temperature container. The low-temperature container is provided with a liquid filling tube used for filling the low-temperature medium. The limited filling device is positioned in the low-temperature container and comprises a pressure bearing cavity, a drain tube and a liquid stopping device, wherein the pressure bearing cavity is communicated with the outlet end of the liquid filling tube; the drain tube is arranged on the top wall of thepressure bearing cavity and is used for communicating the pressure bearing cavity with the interior of the low-temperature container; and the liquid stopping device can move with a liquid level in the low-temperature container so as to seal the drain tube when the liquid level reaches a given liquid level and unseal the drain tube when the liquid level does not reach the given liquid level. Through the limited filling device and the filling method, the container can be filled under the condition of not draining the medium in the container, thereby realizing lossless filling, avoiding resourcewaste, reducing cost and simultaneously benefiting environmental protection.

Description

technical field [0001] The invention relates to the filling of low-temperature medium, in particular to a limited filling device, a low-temperature container with the same, and a method for filling low-temperature medium into the low-temperature container. Background technique [0002] 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...

AI Technical Summary

Problems solved by technology

In the existing container filling method, the medium discharged from the exhaust pipe 3 and the full pipe 4 will inevitably be wasted, which not only easily pollutes the environment but also causes waste of resources. Hidden danger

How to avoid the waste of medium in the filling process is an urgent problem to be solved

[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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