| 摘要 |
PURPOSE: A liquid-automatic switching device, making use of a vaporizer is provided to execute switching stably and quickly by executing switching of gas supplied, on the basis of the pressure of gas vaporized by the vaporizer and regulated into proper pressure. CONSTITUTION: A liquid-automatic switching device, making use of a vaporizer(1) comprises a first supply line(51) connected to a first gas supply place; a second supply line(53) connected to a second gas supply place; an exhaust line(55) connected to a gas consumption plate; the vaporizer connected to the first supply line, the second supply line, and the exhaust supply line; a pressure-measuring unit(5) installed on the exhaust line, to measure the pressure of gaseous gas; a pressure-regulating unit(3) installed between the vaporizer and the pressure-measuring unit, on the exhaust line; a first opening and shutting unit(7) installed on the first supply line; and a second opening and shutting unit(9) installed on the second supply line. The vaporizer vaporizes liquefied gas supplied through the first and second supply lines into gaseous gas and exhausts the vaporized gaseous gas to the exhaust line. The pressure-regulating unit regulates the pressure of the gaseous gas into the pressure not exceeding a predetermined range by lowering the pressure of the gaseous gas exhausted from the vaporizer. The first opening and shutting unit opens or shuts if the pressure of the gaseous gas measured from the pressure-measuring unit is under a predetermined lowest limit point, and shuts if the pressure of the gaseous gas exceeds an upper limit point. The second opening and shutting unit shuts or opens correspondently to the first opening and shutting unit if the pressure of the gaseous gas measured from the pressure-measuring unit is under the predetermined lowest limit point, and shuts if the pressure of the gaseous gas exceeds the upper limit point.
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