Dry goods collection, the article explains the application of...

Air conditioner and freezer

The temperature control function of the air conditioner and the refrigerator is mainly realized by the evaporation and condensation of the heat exchanger copper tube. The size and heat transfer performance of heat exchange heat transfer tube largely determine the efficiency and miniaturization of the whole air conditioner and refrigeration device. In these machines are used in high thermal conductivity of special-shaped copper tube.

Using good processing properties of copper, close to develop and produce a slot and high fin radiator pipe, used in the manufacture of air-conditioner, refrigerator and heat exchanger of waste heat recovery device, can increase the total heat transfer coefficient of new type heat exchanger to use 2 ~ 3 times of ordinary pipe, is to use ordinary 1.2 ~ 1.3 times of low finned tube has been used in domestic, It can save 40% copper and reduce the volume of heat exchanger by more than 1/3.

The copper tube is widely used in the refrigeration system. The connecting pipe, heat exchanger, capillary tube and so on will be used in the copper tube. However, the material of the copper tube is also different.

The brand, condition and specification of the product shall conform to the regulations.
Material analysis

The chemical composition of the pipe shall comply with the corresponding grade in GB/T 5231 standard.

T2 is pure copper, and TP1 and TP2 are phosphodeoxycopper.

For the chemical composition of T2, the following special provisions are made: Cu+Ag≥99.90%. Other ingredients are in accordance with GB 5231.

For the chemical composition of TP1, the following special provisions were made: Cu+Ag≥99.90%, P 0.004% ~ 0.012%. Other ingredients are in accordance with GB 5231.

The chemical composition of TP2 is specified as follows: Cu+Ag≥99.9%, P 0.015% ~ 0.040%. Other ingredients are specified in GB/T 5231

Dimensioning and dimensioning tolerances
Mechanical properties of
Mick recalculates

Method 1: If the sample is less than 1000mm, take a 200mm±10mm length copper pipe and grind the two ports flat. The ports shall be perpendicular to the axis without shrinking. The length was measured with vernier calipers and weighed with a 1mg precision balance to calculate the weight per unit length, which was the Mick weight.

Calculation formula: Mick weight = length/weight *1000

Method 2: If the drawing requires weight, use a balance with a precision of 0.1g for weighing.

Clocks and watches

Most of the working parts of clocks, timepieces and devices with clockwork mechanisms now produced are made of “clock brass”. Copper alloy contains 1.5-2% lead, has good processing properties, suitable for large-scale production. For example, the gear is cut out by a long extruded brass bar, the flat wheel is rushed out by the corresponding thickness of the strip, and the carved bell surface and screws and joints are made of brass or other copper alloys. A large number of cheap watches were made of guncopper (tin-zinc bronze) or plated with nickel-silver (white copper). Some of the finest bells are made of steel and copper alloys. Big Ben used a solid brass rod for the hour hand and 14 feet of brass for the minute hand. A modern clock factory, with copper alloy as the main material, processed with presses and precise moulds, can produce 10,000 to 30,000 clocks a day at very low cost.

The paper

The paper looks simple on the surface, but the paper making process is very complex, requiring many steps and the use of many machines, including coolers, evaporators, pulpers, paper machines, etc. Many of these components, such as various heat exchanger tubes, rollers, percussion rods, semi-liquid pumps and wire mesh, are mostly made of steel alloys. For example, the long-mesh paper machine used today sprays the pulp onto a fast-moving mesh with small mesh (40 to 60 mesh). Made of braid of brass and phosphor bronze wire, the mesh is large in width, generally more than 20 feet (6 meters), and is required to be kept perfectly straight. The mesh moves on a series of small brass or copper rollers, and as it passes with the pulp sprayed onto it, moisture is sucked out from underneath. The mesh vibrates simultaneously to bond the small fibres in the pulp together. Large paper machines have large mesh sizes, up to 26 feet 8 inches (8. l m) wide and 100 feet (3. 5 m) long. Wet pulp not only contains water, but also contains chemical agents used in the papermaking process, which is highly corrosive. In order to ensure the quality of paper, the mesh material requirements are very strict, not only to have high strength and elasticity; And to resist pulp corrosion, copper alloy can be fully competent.

printing

Copper plates are used for photographic plate making in printing. The surface polished copper plate is sensitized with a light-sensitive latex on which an image is taken. Photosensitive copper plate needs to be heated to harden the glue. In order to avoid being softened by heat, copper often contains a small amount of silver or arsenic to increase the softening temperature. Then, the plate is corroded to form a distribution of concave and convex point graphic printing surface. Another important use of copper in printing is the arrangement of brass type blocks on automatic typesetting machines. The type blocks were usually made of leaded brass, but sometimes copper or bronze.

wine

Copper plays an important role in beer brewing around the world. Uchimura, where copper is often used as a malt barrel and fermenter. Some of the most popular breweries stock a dozen of these vats with a capacity of more than 20,000 gallons. In the fermentation tank, in order to cool, commonly used copper pipe water cooling. Copper pipes are also used to heat water vapor in brewing beer, and copper pipes are used to transport liquor, etc. When whiskey and other spirits are distilled, copper stills are usually used. Whiskey ale is distilled twice, using two large copper stills.

medicine

In the pharmaceutical industry, all kinds of steaming, boiling and vacuum devices are made of pure copper. Zinc white copper is widely used in medical devices. Copper alloy or glasses frame commonly used materials.