購買一個 vacuum atmosphere furnace, you must first determine its power

真空氣氛爐爐溫自動控制常用的調節規律有二位、三位、份額、份額積分和份額積分微分。 電阻爐溫度控制就是這樣一個反應調節過程。 比較實際爐溫和氣氛爐溫，得出誤差。 誤差處理後得到控制信號，調整電阻爐的熱功率，完成爐溫控制。

1. The control effect (PID control) is generated according to the error share, integration and differentiation. It is the most widely used control form in process control.

2, two-position conditioning-it has only two states: on and off. When the furnace temperature of the vacuum atmosphere furnace is lower than the set value, the actuator is fully open; when the furnace temperature is higher than the set value, the actuator is fully closed. The actuator is usually a contactor.

3. Three-position conditioning-It has two given values ​​of upper and lower limits. When the furnace temperature of the vacuum atmosphere furnace is lower than the given value of the lower limit, the contactor is fully open; when the furnace temperature is between the given value of the upper limit and the lower limit, the contactor is fully opened. Part of the actuator is open; when the furnace temperature of the atmosphere furnace exceeds the upper limit set value, the actuator is fully closed. For example, when the tubular heater is the heating element, three-position conditioning can be used to complete the difference in heating and heat preservation power.

另外，在選購真空氣氛爐時，首先要確定它的功率。 同時還要考慮它的電熱效率和功率因數。 有兩種方法來確定功率。

One is the heat balance method. According to the law of conservation of energy, the total heat consumed by the resistance vacuum atmosphere furnace is equal to the total heat emitted by the electric heating element. The total heat consumed includes the effective heat of heating the metal and the various heat losses of the atmosphere furnace. The total heat is converted to total power, and the electric heating efficiency is taken into account, and then multiplied by the power reserve coefficient. This coefficient estimates that the furnace productivity may increase and the heat loss may increase. The power reserve coefficient is for the continuous operation of the atmosphere furnace, and the intermittent operation The other kind of atmosphere furnace is the empirical method, which mainly determines the furnace power according to the furnace volume.