Vacuum holding device among gas chromatograph -mass spectrometer

The utility model relates to a vacuum holding device among gas chromatograph -mass spectrometer, this vacuum holding device is whole to be convex cylinder structure, and its both ends are equipped with the hickey, are used for connecting chromatogram end and mass spectrum end respectively, and the punishment of two hickeys do not is equipped with the inside cavity that is the echelonment, convex cylinder structure center is equipped with rotatable diverter valve, and the diverter valve bottom is flat with hickey lower extreme facial features, switch that lower valve portion and cavity are flat mutually to be located to be equipped with the diameter and be 0.1-2.0mm intercommunicating pore, can make intercommunicating pore and both ends cavity level communicate with each other or be perpendicular sealed through the rotary switch valve, the top of diverter valve is equipped with in proper order on it and is gathered tetrafluoro sealing washer and nut outside being located convex cylinder structure for sealed cavity, it is little that this device has a dead volume, simple structure, and sealed reliable characteristics can realize unnecessary unloading mass spectrum when changing related operations such as chromatographic column and the maintenance of chromatogram introduction port, time that the instrument that significantly reduces was maintained, improve the availability factor of instrument.