Copper tube is very important in refrigeration and air-conditioning, which affects the whole use effect of air-conditioning. Today, we are going to discuss the refrigeration and air-conditioning copper pipe performance, types and common problems. What does air conditioning copper pipe have? Air-conditioning copper pipe can be divided into general air-conditioning copper pipe and degreased copper pipe air-conditioning. General Air Conditioning: thickness is generally 2 minutes, 3 minutes 0.5 mm thick, 4 minutes 0.6 mm thick, 5 minutes and 6 minutes 0.7 mm thick; mainly used for R22, the pressure is controlled at 0.98 MPA. Non-fat air conditioning copper pipe: also known as "oil-free air conditioning copper pipe" , there are 2 points, 3 points is 0.8 mm thick, 4 points, 5 points, 6 points is 1.0 mm thick. Mainly used for R410 and other new refrigerants, pressure control in 1.8 MPA.

1. Specific classification of copper pipe materials for air conditioning

 1) oxygen-free copper (oxygen-free copper (TU0, TU1, TU2) and phosphorus-free copper (TUP, TP1, TP2, etc.) , characterized by very little oxygen and a small amount of deoxidizer remaining in the copper; 

2) oxygen-free Copper (oxygen-free copper (oxygen-free copper (oxygen-free copper (oxygen-free copper)) : mainly pure copper (T1, t2, T3, etc.) and copper (oxygen-free copper) ; 

3) special copper (tellurium copper, silver copper and copper) , characterized by the addition of different trace alloying elements to improve the comprehensive properties of materials. Pressure resistance and burst pressure of copper tubes and heat exchangers

Working pressure under standard working conditions of common refrigerants

3. Bursting pressure of copper pipe

4.Working pressure and bursting pressure of heat exchanger

5. The factors influencing the bursting pressure of heat exchanger

 (1) the factors of increasing the bursting pressure are: the bending pipe, the expanding pipe, the cold hardening, the wrapping aluminum fin strengthening. 

(2) the factors that reduce the blasting pressure are the influence of brazing heat and poor assembly of brazing joint. Common problems of copper tube in air conditioner production. Problems of copper tube in manufacture of heat exchanger

2. Leakage of copper pipe in air conditioner or heat exchanger (1) copper pipe itself problem a, serious scratch. (B) the copper pipe has a large inclusion, non-metallic inclusion, metallic inclusion or pressed material. C, high oxygen content, hydrogen embrittlement produced by heating in reducing atmosphere. See Below.

Sentence is too long, please supply a shorter sentence. The main factors affecting the brazing process (1) the influence of the interaction between the filler metal and the base metal. (2) influence of brazing heating temperature. (3) the influence of the gap size between two brazed parts: capillary height is inversely proportional to the gap width, more base metal is dissolved in the liquid solder, deviates from the EUTECTIC point and makes the fluidity worse. (4) influence of liquid brazing fluidity. (5) effect of oxides on the surface of the brazed metal. (6) effect of flux. (7) effects of surface active substances. 2. Problems in Brazing of heat exchanger (1) filler metal is not filled in the gap of welding seam

Source: Encyclopedia of Refrigeration

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