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Method for the production of heat-exchange tubes

A technology of heat exchangers and tube sheets, which is used in applications that require high thermodynamic performance, can solve the problems of reducing heat exchange coefficients, and achieve the effect of increasing heat exchange coefficients and increasing turbulence

Inactive Publication Date: 2008-06-11
KME ITAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, it is clear that if an attempt is made to form tubes directly from said alloy, for example by extrusion, a series of practical problems will be encountered, such as obtaining internal grooves with intersecting profiles, or abandoning said grooves, resulting in Reduced heat transfer coefficient

Method used

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  • Method for the production of heat-exchange tubes
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Embodiment Construction

[0033] The method of the invention for the manufacture of tubes for heat exchangers begins with the manufacture of ingots (plates) with a rectangular cross-section from alloys which can undergo precipitation hardening, in a preferred embodiment, from the group consisting of Cu-Fe-Pa and The alloy of Cu-Fe-Ni-P system starts.

[0034] Table 1 presents the weight percentage data of the components of Cu-Fe-P and Cu-Fe-Ni-P alloys used in the high frequency induction welding test of tubes in the preferred embodiment of the present invention.

[0035] Alloy

Fe wt%

P wt%

Ni wt%

Cu wt%

Cu-Fe-P **

0.101

0.0348

-

The remaining part

Cu-Fe-P-Ni **

0.0560

0.0362

0.0613

The remaining part

[0036] Table 1 - % by weight of composition of the alloys used for high frequency induction welding of ACR pipes.

[0037] Table 2 gives a comparison of some mechanical and electrical properties of the alloy...

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Abstract

Described herein is an embodiment of a method for the production of tubes for heat exchangers, including the steps of: a) producing an ingot with rectangular cross section (plate) b) hot-rolling said plate so as to form a blank c) rapidly cooling said blank by spraying water inside a purposely designed cooling tunnel d) cold-rolling said blank until a strip or skelp is obtained e) forming the tube starting from the skelp to pass from the plane geometry of the skelp to the cylindrical geometry of the tube and welding the tube; in which the ingot is formed starting from an alloy that can undergo precipitation hardening, and the tube is welded by high-frequency induction welding.

Description

technical field [0001] The present invention relates to a method of manufacturing tubes for heat exchangers, especially for use in the airconditioning and refrigeration sector, or more generally for applications requiring high thermodynamic performance. Background technique [0002] Generally, tubes used in the field of air conditioning and refrigeration (ACR) are prepared starting from Cu-DHP (deoxidized high-residual phosphorus) alloy under anaerobic conditions, wherein in order to ensure deoxidation, the content is kept relatively high The residual phosphorus, the content is usually 0.015 ~ 0.04wt%. The presence of phosphorus eliminates brittleness in reducing environments, improves cold plastic deformability, and increases suitability for brazing. Cu-DHP alloys have thus proven to be particularly suitable for applications in sheet metal processing, where joins need to remain mechanically stable. In brazing operations, in fact, deoxidizers are often precisely used to pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/08B23K13/02B21B1/46C21D9/00C21D11/00C22C9/00
CPCB23K13/025B21C37/08B21C37/0811
Inventor 尼科洛·阿曼纳蒂卡洛·安杰利埃莱娜·马尔泰卢奇
Owner KME ITAL