High-temperature high-pressure resistant air exhaust sealing gasket of diesel engine and manufacturing method of high-temperature high-pressure resistant air exhaust sealing gasket

Abstract

The invention provides a high-temperature high-pressure resistant air exhaust sealing gasket of a diesel engine. The high-temperature high-pressure resistant air exhaust sealing gasket is composed of a high-temperature resistant steel sheet of a middle layer and flexible graphite sheets on both side of the high-temperature resistant steel sheet, wherein the high-temperature resistant steel sheet and the flexible graphite sheets are bonded together by bonding layers; and the bonding layers are 704 silicone rubbers. The high-temperature resistant steel sheet is provided with a heave formed through punching, and the heave goes around a to-be-sealed channel. Compared with the prior art, the air exhaust sealing gasket has the advantages that the flexible graphite is good in compression rate and resilience rate and is applied to a sealing position of an air exhaust pipe of the diesel engine to effectively solve the problem of great clearance difference with multiplesurface seal, and the pressed high-temperature resistant steel sheet is adopted to be bonded with the flexible graphite through a silicon rubber material so that the high-temperature resistant steel sheet is high in strength and good in sealing effect and the defect of detachment of the flexible graphite layers and a metal net can not occur simultaneously.

Description

technical field [0001] The invention belongs to the technical field of diesel engines, and in particular relates to a high-temperature and high-pressure-resistant exhaust sealing gasket for diesel engines and a manufacturing method thereof. Background technique [0002] With the continuous improvement of the degree of strengthening of diesel engines, diesel engines are highly compact, working conditions are harsh, the volume of diesel engines is strictly restricted, and the power density is extremely high. The temperature and pressure of the oil and cooling water inside the diesel engine are high, the explosion pressure is high, and the pressure ratio is high, so the sealing problems caused by the increase of temperature and pressure and the increase of deformation are becoming more and more prominent. Exhaust pipes and cylinder heads are traditionally sealed with stamped steel pads, which have a small amount of compression and cannot form a complete seal, and require a larg...

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Problems solved by technology

However, the above-mentioned composite flexible graphite sealing material also has the defect that the metal mesh has low strength, and when it is applied to the engine, the flexible graphite layer is detached from the metal mesh.

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