Dual tube and connecting structure thereof

Abstract

The invention provides a dual tube and a connecting structure thereof. When a common part of an outer tube and an inner tube undergoes stamping perforation processing for connecting the inner tube, defective conditions caused by stamping of waste materials are avoided. An inner tube (12) is arranged inside an outer tube (11); parts of the outer tube (11) and the inner tube (12) are unified into a whole; the inner tube (12) is provided with side walls (121) extending oppositely in parallel from a common part (13) of the outer tube (11) and the inner tube (12) with the diameter direction of the outer tube (11) between the side walls; and the depth end of the side wall (121) and opposite depth walls (122) of the common part (12) of the outer tube (11) and the inner tube (12) are not expanded to a degree exceeding the space between the side walls (121).

Description

technical field [0001] The present invention belongs to the technical field related to a double tube with an inner tube arranged inside the outer tube and fluids such as liquid and gas flowing through the outer tube and the inner tube respectively, and its connection structure. Background technique [0002] Recently, in order to make the flow path of the fluid more compact, double pipes have been widely used in a wide range of industries, and various improvements have been made to the relative arrangement structure of the outer pipe and the inner pipe. [0003] Conventionally, a structure described in Patent Document 1 is known as a double pipe, for example. [0004] Patent Document 1 describes a double pipe in which an outer pipe and an inner pipe are integrally formed by bending a metal plate. [0005] In the double pipe of Patent Document 1, part of the outer pipe and the inner pipe are shared, and the amount of manufacturing materials is reduced, thereby reducing the ma...

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Problems solved by technology

[0010] In the double pipe of Patent Document 1, in order to carry out the branch connection of the inner pipe, when the common part of the outer pipe and the inner pipe is pierced by a punching method that does not generate chips, there is the following problem: when the inner pipe is small, Because the stamping waste conflicts with the inner tube, the inner tube is damaged by the stamping waste or the stamping waste is crimped and fixed on the inner tube and cannot be removed; in the case of a large inner tube, because the stamping waste is hidden in the inner corner of the inner tube, Therefore, the removal of stamping waste becomes troublesome

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