Connecting pipe structure

Abstract

The invention discloses a connecting pipe structure. An iron base material pipe serves as a pipe body, a copper lining pipe is connected in a pipe opening in one end of the pipe body in a welded mode,and a corrosion resistant layer formed through the surface treatment technology of the chromium plating technology or the nickel plating technology or the copper-iron dispersing technology or the chromium permeating technology, carbon-chromium permeating technology or the molybdenum permeating technology or the carbon-molybdenum permeating technology or the nitride permeating technology or the carbon-nitride permeating technology is arranged on the area which is not smaller than 3 mm from the edge of a port on the outer surface of the port with the copper lining pipe, and an iron connecting base used for carrying out welding with a shell is welded outside the other end of the pipe body. According to the connecting pipe structure, iron is adopted as a base material, the price is low, and welding connection with other copper material pipes in a later stage is convenient; meanwhile, the corrosion resistant layer is formed on the outer wall of the port through the surface treatment technology, and thus the port is fearless of flames at high temperatures, so that a welding position 5 mm or wider does not need to be reserved, the risk of breakage of the copper pipe is basically eliminated, the copper lining pipe, the pipe body and the connecting base can be assembled and subjected to furnace welding at a time even the connecting base is welded to the pipe body, the preparing time isgreatly shortened, and energy consumption is greatly reduced.

Description

technical field [0001] The invention relates to the field of air conditioners, in particular to a connecting pipe structure. Background technique [0002] like figure 1 , 2 As shown, the existing air conditioner compressor liquid accumulator includes a housing 1 , an upper connecting pipe 2 and a lower connecting pipe 3 . The compressor generally includes a casing 4 (generally composed of three parts: an upper end cover 41, a cylinder body 42 and a lower end cover 43 (three-part structure) or two parts (a two-part structure) consisting of an upper cylinder body and a lower cylinder body (two-part structure)), Connect pipe 5 etc. The connection pipe 5 and the housing 4 are welded by resistance welding, and an iron connection base 6 needs to be added between the two, such as image 3 shown. [0003] Since the piping of the air conditioner is a copper pipe, the traditional upper connecting pipe 2 and the connecting pipe 5 are all made of copper, but the price of copper is ...

AI Technical Summary

Problems solved by technology

Among them, the outer nozzles of the upper connecting pipe 2 and connecting pipe 5 made of copper need to reserve at least 5 mm without paint adhesion for subsequent flame welding connection with the air-conditioning piping. Therefore, the upper connecting pipe 2 and the connecting pipe made of copper 5. The length of the exposed part of the shell is generally greater than 10mm. If the length is not enough, the subsequent welding process will damage the paint on the exterior of the iron shell and cause it to be corroded in the future.

However, since the grain size of the copper material will grow at high temperature, the strength and fatigue resistance of the copper tube will decrease. During long-term operation, the risk of fatigue fracture due to piping vibration is higher. Therefore, when preparing products with this structure, the welding of the iron connection base and the copper upper connection pipe 2 and connection pipe 5 cannot be carried out in batches. Welding, only flame welding can be used one by one

Therefore, adopting this kind of structure and manufacturing process has low efficiency, high cost and complex process

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