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 invention belongs to the technical field of a double pipe in which an inner pipe is arranged inside an outer pipe, and fluids such as liquid and gas are respectively circulated in the outer pipe and the inner pipe, and a connection structure thereof. Background technique [0002] Recently, in order to make the flow path of the fluid compact, the double tube has been popularized in a wide range of industrial fields, and various improvements have been tried on the relative arrangement structure of the outer tube and the inner tube. [0003] Conventionally, as a double tube, the structure described in patent document 1 is known, for example. [0004] Patent Document 1 describes a double tube in which an outer tube and an inner tube are integrally formed by bending a metal plate. [0005] In the double tube of Patent Document 1, a part of the outer tube and the inner tube are shared, so that the amount of manufacturing material is reduced, and the man...

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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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