Brazing Process of Pipes and Compressor

Abstract

The present invention describes a brazing process in copper and steel parts for several equipment, using a zinc alloy as an additive material, and a device produced according do said process. Specifically, the present invention includes a brazing process between a copper pipe and a steel part, using an alloy composed mainly by zinc as addiction material. Said brazing process is applied to exhaust copper pipes and steel exhaust system, both present in the compressors. The present invention is situated on the industrial field of compressors, metallurgy, mechanical engineering and materials engineering.

Claims

1. Brazing process of pipes wherein a first pipe is composed of copper and a second pipe is composed of steel, the process characterized by comprising: applying, between said first and second pipes, a brazing alloy composed by Zinc/Aluminum; and application of controlled means of melting and cooling of the first set and second tubes and braze alloy.

2. Process, according to claim 1, characterized by the fact that brazing alloy comprises between 95%-99% of Zinc and 5%-1% of Aluminum.

3. Process, according to claim 1, characterized by the fact that the brazing alloy comprises 98% of Zinc and 2% of Aluminum.

4. Compressor comprising exhaust system composed by a first pipe composed of copper and a second pipe composed by steel, characterized by being brazed by a process as defined in claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to better define and clarify the content of the present application, the following figure appears:

[0017] FIG. 1 shows a copper tube (C) added/attached to a metal part of steel (A) after being subjected to brazing with a zinc alloy (Z).

DETAILED DESCRIPTION OF THE INVENTION

[0018] The descriptions that follow are presented by way of example and not limiting the scope of the invention and will understand more clearly the object of the present application.

[0019] The present invention has the objective to present a solution for the production of compressors, in particular by a brazing process that replaces the conventional use of silver and their alloys, for an alloy mainly composed of zinc as filler material for hermetic connection pieces made of different metals.

[0020] The capillary or capillary action is the ability of a liquid metal has to fill spaces between the components to braze. In the brazing process it is not necessary to work the profile parts, because these do not fuse. What will join the pieces is the filler of metal. This cast do penetrate the spaces between the parts to braze.

[0021] The brazing with silver alloys presents a better capillarity than zinc alloy, which can be related to the temperature (high to silver alloys) and different properties of the two filler materials, such as: density, thermal conductivity, surface tension, among others. This implies that the filler of metal composed of zinc may have lower penetration rates.

[0022] However, for the proposed application in the present invention, the smallest capillarity of zinc alloys is still sufficient to fulfill the mechanical strength requirements, and which is offset by reduced costs with the acquisition of material.

[0023] The present invention contemplates the use of a zinc and aluminum alloy as filler material for a brazing process carried out at low temperatures at which the fusion of the filler material can be controlled, which minimizes the size of the affected area heat between the base material and reduce the energy consumption required for heating, thereby reducing the cost of the material involved.

Example 1

Preferred Realization

[0024] In a first object the present invention provides a copper pipe brazing process of steel parts from an alloy mainly comprising zinc, or the alloy used as the filler material consists of 98% of zinc and 2% aluminum.

Example 2

Preferred Realization

[0025] In a second object of the present invention, a compressor comprising copper discharge pipe is fixed to a steel structure, the type Bundy tube, through the specific brazing process with alloys composed mainly of zinc.

[0026] Those skilled in the art will value the knowledge presented herein, and may play the invention shown in the embodiments, and other embodiments which fall within the scope of the appended claims.