Pour acheter un vacuum atmosphere furnace, you must first determine its power

Le contrôle automatique de la température du four à atmosphère sous vide couramment utilisé comprend les lois de régulation à deux positions, à trois positions, à partage, à partage intégral et à partage intégral différentiel. Le contrôle de la température du four à résistance est un tel processus de conditionnement de réaction. Comparez la température réelle du four et la température du four à atmosphère pour obtenir l’erreur. Une fois l’erreur traitée, le signal de commande est obtenu pour ajuster la puissance thermique du four à résistance, puis le contrôle de la température du four est terminé.

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.

De plus, lors de l’achat d’un four à atmosphère sous vide, vous devez d’abord déterminer sa puissance. Dans le même temps, vous devez tenir compte de son efficacité de chauffage électrique et de son facteur de puissance. Il existe deux façons de déterminer la puissance.

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.