Hair dryer - working principle The motor and the blade are directly connected. After the power is turned on, the motor drives the fan blade to rotate. The air sucked in from the air inlet passes through the electric heating element and is controlled by the switch to become hot air or cold air sent from the air outlet. Usually, only when the motor is energized, the heating element can be turned on to avoid overheating and damage. The simple method of adjusting the air temperature by the blower is to rotate the baffle on the outer casing; when there is a control switch, the temperature can be adjusted by the splitter; when the PTC component is used, the temperature can be automatically controlled. Some hair dryers achieve stepless adjustment of wind temperature and air volume by changing the external power supply voltage. It is a combination of a set of heating wire and a small fan. When the power is applied, the heating wire generates heat, and the wind blown by the fan passes through the heating wire, and becomes hot air. If only a small fan rotates, and the heating wire is not hot, then the wind is only hot and not hot. The wind blown by the hair dryer is dry wind. If it is used for too long, it will easily cause water loss and heat damage. The secret of minimizing the damage is to use the towel to pat the moisture on the hair first. Combing your hair and then use a hair dryer.
Hair dryer - circuit diagram
The first process of Investment Casting production is the manufacture of investment mold, investment mold is used to form the cavity in the refractory shell model, so in order to obtain the casting with high dimensional accuracy and surface finish, the investment mold itself should have high dimensional accuracy and surface finish. In addition, the performance of the melt itself should also make the subsequent shell making process as simple as possible. In order to obtain the above high quality requirements of the investment die, in addition to good pressure (pressing the investment die), but also must choose the appropriate mold material (referred to as the mold) and reasonable mold making process.
The advantage of the investment casting method is that it can cast complex castings of various alloys, especially high temperature alloy castings. For example, the blade of jet engine, its streamlined outer profile and cooling inner cavity, with machining process almost impossible to form. Investment casting process can not only achieve mass production, ensure the consistency of castings, but also avoid the stress concentration of residual blade lines after machining.
The biggest advantage of investment casting is that because investment casting has a very high dimensional accuracy and surface finish, so it can reduce the machining work, just leave a little machining allowance in the parts requiring higher parts, and even some castings only leave grinding and polishing allowance, without mechanical processing can be used. It can be seen that the investment casting method can greatly save machine tools, processing time and metal raw materials.
silica soil casting parts, Precise dimension
Tianhui Machine Co.,Ltd , https://www.thcastings.com