Seal device and segmented exhaust pipe with same

Abstract

The invention discloses a seal device which is used for sealing the connector position of an internal connection exhaust pipe and an external connection exhaust pipe of a segmented exhaust pipe. The seal device comprises a tubular body, and the tubular body comprises a first seal part and a second seal part in the length direction, wherein the circumferential face of the outer wall of an internal exhaust pipe orifice is sleeved with the first seal part in an interference mode, and the second seal part can elastically deform. The second seal part is attached to the circumferential face of the outer wall of an external connection exhaust orifice in a pre-pressing and abutting-against mode. The seal device is simple in structure, the sealing performance, under high and low temperature changes and a vibration working condition, of the seal device can be improved, sealing reliability of the connector position of the segmented exhaust pipe can be improved, and the service life of the seal device can be prolonged. On the basis, the invention further discloses the segmented exhaust pipe with the seal device.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a sealing device for segmented exhaust pipes. Furthermore, the invention relates to a segmented exhaust pipe with such a sealing device. Background technique [0002] At present, the forms of engine exhaust pipes are mainly divided into integral exhaust pipes and segmented exhaust pipes. For multi-cylinder engines, integral exhaust pipes cannot effectively release the thermal stress of work, which may easily lead to deformation and damage to the exhaust pipe. Faults such as trachea gaskets; therefore, segmented exhaust pipes have been widely used in multi-cylinder engines. [0003] The segmented exhaust pipe is usually composed of at least two connected exhaust pipes, and the interface of the segmented exhaust pipe is in a high-temperature and vibrating working environment, and the interface of each segment of the exhaust pipe is prone to air leakage. Therefore, in order to ens...

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Problems solved by technology

However, when the thermal expansion method is used for sealing, the radial gap S at the interface of the two exhaust pipes is small, and the assembly is difficult; moreover, in a relatively low temperature working state, the thermal expansion is insufficient, and air leakage will inevitably occur; at the same time, In this sealing method, the radial gap S between the two sections of the exhaust pipe is small, and sintering is prone to occur at the interface, and when the thermal expansion at the interface is not uniform, the joint of the exhaust pipe is stuck, and the joint of the exhaust pipe cannot be fixed. Therefore, this kind of sealing method is more likely to cause serious problems such as misalignment of the exhaust pipe gasket, and even cracks in the exhaust pipe.

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