The difference between the oven and the high-temperature aging box in the long-term contact with the user, often encountered users of the oven (drying box), high temperature test box, air thermal aging box and aging room (burning room) and other indicators similar to the role of the fuzzy boundaries of the equipment can not be separated The situation here is to make a more systematic explanation.
1, the main function of their respective drying oven is also called oven, oven, etc., the ring test industry production of the drying box to electric heating convection heat transfer. There are two kinds of natural convection and forced blast. It is mainly used to dry the sample, it can also be used for heat aging (non-air oxidation factors) and colloid curing, annealing stress and so on.
High-temperature test chambers are used for high-temperature adaptability test and high-temperature stress test of test samples. They can also be used as drying ovens. However, because of large differences in indicators, dry ovens cannot replace high-temperature test boxes.
The air heat aging test box is used to test the air heat aging of the test sample, detect the aging speed of the test sample in the high temperature air environment, and evaluate the life of the test sample.
Aging rooms are generally used for sophisticated screening of products before they leave the factory, picking out previous failed parts. Used for electric and electronic products.
There is also a thermostatic incubator with low temperature requirements, which is mostly used in medical and agroforestry.
2. The current implementation standard of the corresponding product standard drying oven is JB/T5520-91 "Drying box technical conditions";
The current implementation of the high temperature test box GB/T11158-2008 "High temperature test box technical conditions"
The current implementation standard of air thermal aging test chamber JB/T7444-94 "Air Thermal Aging Test Chamber"
The current implementation of the standard electric heating incubator YY0027-90 "electric constant temperature incubator"
There is no special product standard for the aging room, generally refer to GB/T11158-2008 "high temperature test box technical conditions" implementation
3, the similarities and differences of indicators
3.1 Dryer temperature fluctuation: ±1°C
Temperature uniformity: ±3.5% (natural convection, highest nominal temperature)
±2.5% (forced convection, maximum nominal temperature)
Temperature stability: 2°C (24h, ≤200°C, ≤2m3)
1% (24h, >200°C, ≤2m3)
3°C (24h, ≤200°C, >2m3)
1.5% (24h, >200°C, >2m3)
3.2 High temperature chamber temperature fluctuation: ≤1°C
Temperature gradient: ≤ 2°C
Temperature deviation: ±2°C
3.3 Air thermal aging test chamber temperature fluctuation: ≤ 1.5 °C (forced convection)
≤2.5°C (natural convection)
Temperature uniformity: ≤ 7°C (forced convection, maximum temperature 300°C)
≤10°C (forced convection, maximum temperature 500°C)
Temperature stability: ≤5°C(24h)
Ventilation capacity: ≤100times/h or 100～200times/h (adjustable in range, forced convection)
≤50times/h (adjustable in range, natural convection)
3.4 Aging rooms As there is no product standard for aging rooms, and the operating temperature is not high, generally refer to the indicators of the high temperature test chamber:
Temperature fluctuation: ≤1°C
Temperature uniformity: ≤ 2 °C (in accordance with GB/T11158-98 indicators)
Temperature deviation: ±2°C
Air change volume: adjustable
4, the difference in configuration
4.1 Heating Currently, nickel-cadmium alloy wire heating is generally used, which has the characteristics of small heat capacity, oxidation resistance, and long life. Some dry boxes use iron-chromium aluminum wire, which is an ordinary electric stove wire, and its service life is relatively short. If the sample has a certain amount of corrosive or volatile substances, it should be equipped with stainless steel heating pipe.
4.2 Blowing In addition to the natural convection drying oven and the aging box, the drying box is usually equipped with a relatively small blower.
4.3 Ventilation Natural convection ovens and aging tanks must rely on ventilation flaps to create convection, naturally opening the vents.
Forced air drying ovens and high-temperature test chambers do not require high ventilation, but they are all equipped with adjustable ventilation flaps for quicker cooling.
Forced convection air-heat aging test chambers are required to have air-exchange volume test indexes, and forced air-blowers should be configured, and air-conditioning measures can be set on the circuit.
When the aging room is working, the sample is energized and will generate heat. In order to balance the temperature, ventilation fans must be installed.
4.4 Structure Due to the high temperature field requirements of the high temperature test chamber, laminar flow design is generally used.
The air thermal aging test chamber will have uncertain temperature conditions under different ventilation conditions. Therefore, there are products equipped with rotating test sample shelves.
Aging rooms generally consider the situation of a sample rack or sample vehicle.
5, from the use of requirements to determine what kind of equipment required due to the different equipment configuration, the price difference is also greater, so users must be clear when buying equipment their own needs, so as not to sell the equipment due to indicators can not be used, Or cost-effective uneconomical.
It can be used to purchase common drying ovens for workpiece drying, colloidal solidification and annealing, which require low temperature deviation. If the process requires a higher temperature deviation, you should purchase a high temperature test chamber.
Use conditions are clear air exchange volume requirements only purchased air heat aging test chamber. Only need to have a proper ventilation and no clear indicators, you can buy a dry box or high temperature test box can be, generally 300 °C and the equipment is equipped with a ventilation flap.
Ordering an aging room should provide the supplier with the total calorific value of the sample, so that the supplier can configure the amount of exhaust air.
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