GAS SAMPLE TAKING DEVICE Russian patent published in 2007 - IPC G01N1/22 

FIELD: oil and gas production, particularly devices for gas sample taking, testing to determine chemical composition, gas concentration in ground, snow, water and other object to be investigated, to perform oil and gas prospecting from ground surface.

SUBSTANCE: gas sample taking device comprises can filled with sample to be analyzed and closed with air-tight lid, punching means with vacuum hose put on opposite end thereof so that the hose is connected to gas chromatography means and sealing system. The sealing system comprises sealing shell put on lower punching means end and shaped as truncated cone with widened toroidal lower edge. The cone defines circle or truncated trapezium in cross-section. The shell is sealed to can lid by means of conical washer and press-on nut. Device comprises rigid frame with upper and lower cross-arms having ends connected with each other through two bars. The frame provides arrangement of can filled with sample to be analyzed and heater on the low cross-arm. Upper cross-arm is pivotally connected with bars in horizontal plane by means of lock connection. Crew punching means anvil is installed in upper cross-arm of the frame. The screw anvil has side opening and cooperates with punching means arranged therein. Can with sample is produced of thermoplastic material and is installed in metal container conforming to outer can surface. The metal container comprises cup and closure having axial orifice to provide vertical punching means movement. Annular area surrounding the orifice is air-tightly sealed with toroidal edge of said sealing conical shell with the use of conical washer and press-on nut screwed in metal container closure. O-ring made of resilient elastic material is arranged between lower horizontal support surface of metal closure and corresponding upper horizontal surface of can lid produced of thermoplastic material. Orifice is air-tightly sealed. O-ring made of resilient elastic material is located between lower surface and upper surface of can lid. Peripheral container gap defined by cup and closure is created between conical closure surface and shaped O-ring. Uncompensated surface of shaped O-sing seals said gap under the action of compressing force transmitted from support cup with radial orifices from below. The support cup is pivotally connected to metal container closure. Compressing force is also transmitted by lower bush supported by lower frame cross-arm and by female pivotally spring-loaded cup of metal container. Compression force is transmitted from above through upper bush having side opening and upper axial orifice and pivotally connected with upper punching means part with support pivotally put on upper bush top. The support has axial orifice to receive screw punching means anvil and is connected with another screw anvil having greater diameter. Screw support having greater diameter is pivotally connected to upper cross-arm of the frame and includes the second screw anvil coaxial thereto to provide reliable initial sealing of gaps defined in adjacent can lid and container closure surfaces and for following vertical punching means movement in can lid to communicate the can with gas chromatography means.

EFFECT: increased gas content measurement accuracy due to improved can sealing before cam piercing, can interior evacuation and lid penetration in vacuum environment.

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