Dual-layer gas pipe, and connection structure and manufacturing method thereof

Abstract

The invention discloses a dual-layer gas pipe, and a connection structure and a manufacturing method thereof. The dual-layer gas pipe comprises an inner joint, an outer joint and a connection body. The head end of the inner joint is connected with the tail end of an inner-layer pipe. The head end of the outer joint is connected with the tail end of an outer-layer pipe. The tail end of the outer joint is connected with the outer wall of the inner joint. A first cavity is formed between the inner wall of the outer joint, the inner joint and part of the outer wall of the inner-layer pipe. A gas guide hole is formed in the part, forming the first cavity, of the wall of the outer joint. The outer joint is inserted into an external connecting piece. A second cavity is formed between the inner wall of the external connecting piece and the outer wall of the outer joint and at the position of the gas guide hole. The outer-layer pipe is sleeved with the connection body, and the connection body is used to be detachably connected with the external connecting piece. According to the dual-layer gas pipe, and the connection structure and the manufacturing method thereof, the structure is simple,and the requirements on installation are common; the inner-layer pipe and the outer-layer pipe can be used in cooperation with steel pipes as well as metal hoses, and the adaptability to different application occasions is high; the requirement on the processing accuracy is not high, and the processing cost and the material cost are low; and no throttling is carried out on a guide-out part for thegas which leaks out, and therefore, the gas can be guided out smoothly and quickly.

Description

technical field [0001] The invention relates to the technical field of gas transportation, in particular to a double-layer gas pipeline and its connecting structure and manufacturing method. Background technique [0002] As the gas is a dangerous gas, if it reaches a certain concentration in the environment, it will explode when exposed to an open flame, causing harm to surrounding equipment, personnel and the environment. For gas pipelines, preventing the internal gas from leaking to the outside is the focus of safety protection. To minimize the risk of gas leakage, the use of double-layer gas lines is an effective solution. When the inner tube of the double-layer pipeline used to transport gas is damaged, it will flow into the interlayer between the inner and outer tubes, and then discharge the gas to a safe area through the interlayer, thus ensuring that the gas will not leak directly to the outside environment, ensuring safety. [0003] Existing double-walled gas pipe...

AI Technical Summary

Problems solved by technology

When steel pipes are used for both the inner and outer pipes, the spherical sealing form adopted in this scheme may cause failure

lead to limited application

[0005] Second, in order to process the spherical seal on the inner pipe head, and use threaded connection between the expansion sleeve and the inner pipe head, the wall thickness of the inner pipe head must be very thick, which increases the material cost, and the processing accuracy of the spherical seal is relatively high. High, high processing cost

From the structural diagram of this scheme, it can be seen that the cross-sectional area of ​​the gas outlet at the end is smaller than the interlayer cross-sectional area between the inner and outer pipes, and the gas is throttled at the end. Once the sealing surface at the end leaks, there will be A large amount of gas leakage, this structure is not conducive to the rapid export of leaked gas

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