Gas engine double-layer gas pipeline structure and manufacturing method

Abstract

The invention relates to a double-layer gas pipeline structure of a gas engine. The double-layer gas pipeline structure is characterized in that an inside concave part of a lap joint flange is buckled and matched with a convex edge of an inner pipe flange; a short neck with length of b in the inner pipe flange is connected with an inner pipe in a butt welding way; air ventilating holes are formed in the clamping part, corresponding to the outside of the inner pipe and the inside of an outer pipe, of the inner pipe flange; the outer pipe is separated into two sections, the middle part is provided with a gap with length of a, and a is greater than b; the two sections of the outer pipe are connected by an overlapping pipe at the gap part in a welding way. During production and manufacturing, the outer pipe is pushed to one side, and the short neck of the inner pipe flange and the inner pipe are connected in the butt welding way at the opposite end; during operation in the reverse direction, the short neck of the inner pipe flange is connected with the inner pipe in the butt welding way; the weld non-destructive detection is performed by the same type; after the detection is qualified, the overlapping pipe is welded at the gap part of the two sections of the outer pipe. The double-layer gas pipeline structure has the advantages that the full penetration of the welding part of the inner pipe for gas conveying is guaranteed; the outer pipe is conveniently moved along the axial direction, and the welding position of the inner pipe is performed with the welding and non-destructive detection.

Description

technical field [0001] The invention relates to a gas engine double-layer gas pipeline structure and a manufacturing method, belonging to the technical field of engine manufacturing. Background technique [0002] Once the gas used by the gas engine leaks, it will accumulate in the environment to a certain concentration. In the event of an open flame or high temperature, it will easily explode or fire, causing harm to surrounding equipment, personnel and the environment. In order to minimize the gas leakage risk of the gas engine, the prior art has adopted such a solution as a double-layer gas pipeline. For example, Chinese patent application No. 201410112756.5 discloses a double-layer gas delivery system for a multi-point intake dual-fuel engine. However, in the double-layer gas pipeline structure of the prior art, the inner tube at the connecting flange can only be inserted butt welded instead of butt welded, which cannot guarantee full penetration of the welded part, and ...

AI Technical Summary

Problems solved by technology

However, in the double-layer gas pipeline structure of the prior art, the inner tube at the connecting flange can only be inserted butt welded instead of butt welded, which cannot guarantee full penetration of the welded part, and cannot weld the inner tube. The quality of the flaw detection cannot guarantee the welding quality of the inner pipe 100%. In addition, the sealing effect of the flat flange connection is not ideal, and it is also prone to leakage. Therefore, there are still quite high safety hazards in the double-layer gas pipeline structure of the prior art.

Images