Gas Chromatograph with Diaphragm Purge Debris Separation Mechanism

Abstract

A diaphragm purging chip separation mechanism of a gas chromatograph comprises a sample injector and a chip separation and collecting device. A diaphragm purging gas circuit of the sample injector is connected with a purging gas flow control system. The chip separation and collecting device comprises a device body and a chip filter screen. A chip collecting pond, a gas inlet channel and a gas outlet channel are arranged in the device body. The circulating area of the gas inlet channel and the circulating area of the gas outlet channel are far smaller than the circulating area of the chip collecting pond. The chip collecting pond is provided with a chip removal opening. A detachable cover plate is arranged on the chip removal opening. The inlet of the gas inlet channel is connected with the outlet of the diaphragm purging gas circuit. The outlet of the gas inlet channel is located on the upper portion of the chip collecting pond. The gas inlet of the gas outlet channel is located in the top wall of the chip collecting pond, and the outlet of the gas outlet channel is connected with the purging gas flow control system. The chip filter screen is arranged on the inlet or the outlet of the gas outlet channel in a blocking mode. The diaphragm purging chip separation mechanism has the advantages of guaranteeing control stability of purging gas, prolonging the service life of a mechanical valve or a proportional electromagnetic valve, being capable of reused, and achieving environment friendliness.

Description

technical field [0001] The invention relates to the field of gas chromatographs, in particular to a gas chromatograph with a diaphragm purging debris separation mechanism. Background technique [0002] During the long-term use of the gas chromatograph, due to multiple injections, the diaphragm liner of the injector is easily damaged, resulting in debris falling off. In order to prevent the falling debris from entering the chromatographic column with the carrier gas and affecting the analysis, a diaphragm purge function is added to the injector design to blow the debris out of the injector. [0003] At the same time, the gas chromatograph has a special purge gas flow control system for controlling the flow of purge gas, which is composed of a mechanical valve / proportional solenoid valve and a flow sensor / pressure sensor. Limited by the structure of the injector, the mechanical valve / proportional solenoid valve can only be installed at the purge outlet. As a result, after lon...

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Problems solved by technology

Limited by the structure of the injector, the mechanical valve / proportional solenoid valve can only be installed at the purge outlet. As a result, after long-term purging, the fallen debris will accumulate at the air inlet of each mechanical valve or proportional solenoid valve, and even enter the valve. body, causing damage to the valve, affecting the stability of the purge gas, and also affecting the service life of the valve

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