Method for controlling pressure during automatic aeration and deflation for leakage detection of satellite tank (gas cylinder)

Abstract

The invention provides a system for controlling a pressure during automatic aeration and deflation for leakage detection of a satellite tank (gas cylinder). The system comprises a pressure acquisition unit, a pressure control unit, an execution unit and a user interface, wherein the pressure acquisition unit comprises various pressure sensors; the pressure control unit comprises a programmable logic controller (PLC) module and software; the execution unit comprises an electric proportional pressure regulation valve, a pneumatic control valve and a relevant servo mechanism; and the user interface comprises an upper host, a touch screen and software. The invention also provides a method for controlling the pressure by using the control system. The system and the method are applicable to pressure control during automatic aeration and deflation for leakage detection of the satellite tank (gas cylinder) and pressure control of other similar workpieces simultaneously. By the system and the method, a great uncertainty caused by a pressure virtual value when the pressure is manually controlled during automatic aeration and deflation for leakage detection of the satellite tank (gas cylinder), and influences on the life of a valve are avoided.

Description

technical field [0001] The invention relates to a pressure control method, in particular to a pressure control system and a control method for the leak detection and automatic filling and deflation process of a satellite storage tank (gas cylinder). Background technique [0002] The volume of satellite storage tanks (gas cylinders) generally ranges from several hundred liters to several thousand liters. Due to the limitations of the workpiece itself and the requirements of the leak detection process, it is necessary to connect external pressure measuring instruments and inflation and deflation pipes when charging and deflated for leak detection. Due to the limitation of pressure resistance conditions, the inner diameter of the pipeline is very small, generally 4mm, and the pipeline is very long, generally tens of meters, so the flow resistance of the pipeline is very large, and the pressure value displayed by the external pressure measuring instrument is not the real pressure...

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Problems solved by technology

[0002] The volume of satellite storage tanks (gas cylinders) generally ranges from several hundred liters to several thousand liters. Due to the limitations of the workpiece itself and the requirements of the leak detection process, it is necessary to connect external pressure measuring instruments and inflation and deflation pipes when charging and deflated for leak detection. Due to the limitation of pressure resistance conditions, the inner diameter of the pipeline is very small, generally 4mm, and the pipeline is very long, generally tens of meters, so the flow resistance of the pipeline is very large, and the pressure value displayed by the external pressure measuring instrument is not the real pressure of the product. That is to say, the pressure is a "false value", and the larger the volume of the product, the more serious the "false value" phenomenon; at present, the pressure control completely adopts the "on-site manual control method", that is, during the process of filling and deflation, there is a period of time interval Close the control valve and observe the real value of the product, especially when it is close to the pressure setting value, the control valve must be switched frequently to ensure that the pressure will not exceed the limit. The control is completely realized by experience, feeling and frequent switching of the valve. It can solve the problem of "false pressure value", but it cannot get rid of its own inherent human uncertainty and safety hazards, and the frequent switching of valves also has a great impact on the life of the valve

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