Cold trap device for gas chromatography of transformer insulating oil

Abstract

The invention relates to a cold trap device for gas chromatography of transformer insulating oil. The cold trap device comprises a cold trap shell, wherein the upper top surface of the shell is provided with an upper gas inlet/outlet nozzle, and the lower bottom surface of the shell is provided with a lower gas inlet/outlet nozzle; an external refrigeration pipe is wound outside the shell; the shell is internally provided with an internal refrigeration pipe; an upper perforated plate and a lower perforated plate are fixedly arranged in the cold trap shell; the part between the upper perforated plate and the lower perforated plate is filled with stationary phase; the cold trap shell is contained in semi-cylindrical grooves formed in the middles of a left metal heat conduction clamp block and a right metal heat conduction clamp block; the left metal heat conduction clamp block and the right metal heat conduction clamp block are respectively provided with a penetrating hole, and are fixed together by fixed bolts which passes through the penetrating holes; a left semiconductor refrigeration plate and a right semiconductor refrigeration plate which are stuck by silica gel paste are arranged on the outer sides of the left metal heat conduction clamp block and the right metal heat conduction clamp block respectively. After the cold trap device is used, internal refrigeration and external refrigeration are carried out at the same time, so that gas refrigeration is uniform and rapid; a heating structure is ingenious, so that gas can be completely trapped, and no residue is left during desorption.

Description

technical field [0001] The invention belongs to the technical field of insulating oil gas chromatographic analysis, in particular to a cold trap device used for transformer insulating oil gas chromatographic analysis. Background technique [0002] At present, cold trap technology is mainly used in scientific research, biology, hospital, chemical industry, freeze-drying, purification, drying, storage and other industries. According to different uses, different cold trap devices will be used, including vacuum cold trap devices, liquid nitrogen cold Trap device, diffusion pump cooling device, etc. The appearance is mostly a rectangular cold room. The sample mixture passes through the cold trap inlet and passes through the baffle in the cold room. The stationary phase captures the sample gas, and then discharges the remaining pure flushing gas through the gas outlet the eluting gas. The structure mainly includes the cold trap shell, the outer wall of the gallbladder, but the in...

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Problems solved by technology

The structure mainly includes the cold trap shell, the outer wall of the gallbladder, but the inner wall, the air inlet, the air outlet and the baffle. At present, the structure and effect of the cold trap are difficult to meet the requirements of gas separation in the field of oil gas chromatography analysis technology. , the research and development of a new type of cold trap device has always been the direction of scientific and technological personnel's efforts to explore

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