How to choose an industrial hot air blower?

Since the discovery of the thermal effect of electric current, the electric heating method is first widely used in household appliances, and then gradually applied to small laboratories, with the invention of nickel-chromium alloy, to the 1920s after the development of industrial-type applications in the form of hot air source, industrial heaters began to be widely used in the foundry industry, medicine and food, printing and packaging and other industries. Industrial hot air blower generally consists of blower, heater, metal shell, circuit control system, air outlet system, etc. According to the different pressure and air volume, it is divided into different types such as standard pressure, medium pressure and high pressure. It has the advantages of simple structure, uniform temperature, easy to control, good heating quality, no smoke, no noise and so on.

Usually, the fan's air volume and pressure is inversely proportional to the relationship, the higher the power of the fan motor, then relatively speaking, the air volume and wind pressure will be higher, how to choose, it depends on the needs of the application.

Hot air blower fan the same power of the motor, the higher the wind pressure, the smaller the air volume, the greater the noise, and vice versa, the larger the air volume noise is lower, the wind pressure is also lower. More typical fan types: multi-wing fan / medium pressure fan / high pressure fan / ultra-high pressure fan, etc..

Selection of hot air blower pressure is mainly based on specific working conditions and process needs to be determined. The general principle is: the shorter the workpiece needs to be dried, the higher the wind pressure is needed, and the larger the volume or quantity of the workpiece is, the higher the wind volume needs to be. Especially for fast drying type, usually choose high pressure hot air blower more.

Low air pressure hot air blower is more used in general warming, heating, baking, aging of electronic products, simulating temperature environment, matching of oven/baking room/tunnel furnace, warming, etc

High air pressure heaters have more applications in fast blow drying or rapid drying. Typical cases are various types of on-line drying, rapid blow drying of all kinds of bottles/cans/buckets, de-watering after spraying for labeling, sterilizing, and pass-through drying.

The piping is too thin or too long, generally not recommended to choose a low air pressure hot air blower, affected by the internal resistance of the piping, the air loss is large, the temperature drop is too fast, the efficiency of the workpiece to be heated/dried is low, and the application of the efficiency ratio is not high. If the piping does not take qualified thermal insulation measures, the heat loss is even greater.

Casting hot air blower because of the closed cavity after the box, only the gate risers can overflow moisture, in the selection of hot air blower is usually used in the selection of high-pressure hot air blower, air volume of at least 10 times the volume of the cavity, in order to meet the needs of the process, more air volume to ensure that the hot air in the formation of a positive pressure in the cavity, the positive pressure can make the temperature rise more uniformly but also more quickly extruded from the inner wall of the cavity water, so that the depth of the drying depth of the inner wall to extend out to a certain depth, the moisture dry thoroughly, in the iron casting to effectively prevent the running of the water or discharge, in order to ensure that the variety of castings, at the same time, to ensure the safety of the castings.

Typical applications: Foundries where the molding material is resin sand, quartzite, clay sand, water glass, etc.

Drying after disappearance mold surface coating (general temperature between 50℃～60℃), etc.

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