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Vacuum Annealing Furnace for Roll-core Transformer
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General:
1. It is mainly used for vacuum annealing treating for iron core of roll-core transformer, instrument transformer, reactor, and other electrical equipment, which can increase the permeability of iron core, and decrease the transformer loss accordingly.
2. Our vacuum annealing furnace won the Award for New-Important Product of Guangdong Province and the Award for Advancement in Science and Technology of Zhongshan City. |
Technical data:
1、Loading capacity: 1500~~5000KG
2、Maximum operating temperature: 900±5℃
3、Heating power: 3×55KW
4、Ultimate vacuum (cold condition): ≤20Pa
5、Leak rate (unloaded): 50Pa.L/s |
Necessary energy at worksite (provided by customer):
1. Power: 380V, 3 phases, 50Hz;
2. Cooling water: inlet temperature≤25℃, inlet pressure: 0.2 - 0.4Mpa, flow≥20M3/h;
3. Compressed air: pressure: 0.4 - 0.6Mpa, flow: 0.6 M3/h;
4. Cooling gas: nitrogen or argon (purity≥99.99%). |
Characteristics:
1. The structure of this equipment is special horizontal and rectangular, which is convenient for pulling and pushing workpieces, and prevent the trolley interfering the heating elements, so that the heating elements can be located more reasonable, and the temperature of heating area in the furnace will be more equal; the rectangular furnace can decrease idle space, save time of evacuation, and decrease the nitrogen consumption.
2. It is capable of meeting the annealing requirement on iron core of electrical equipments, because the workpieces is treated under vacuum state, the iron core will not be oxidated and distorted during the whole annealing processing, and the oil stain and dirt on the surface of iron core will be cleaned under high temperature and high vacuum degree, so finally the workpieces will be bright annealed.
3. Octagonal heating elements are symmetrical located in the furnace, the shape of heating area is similar with the shape of workpieces, so that the idle space in the furnace can be decreased; the front cover of furnace is spring sealing cover, equipped with pneumatic quick-actuating closures device, which can decrease heat loss and increase utilization factor of power.
4. Equipped with heating uniform-temperature fan, which can remedy the shortage of low heating efficiency and low uniform temperature under vacuum state; compared with the annealing furnaces from other suppliers, our annealing furnace can decrease the processing time, increase productive efficiency, and profitable for the processing quality of workpieces.
5. The heating element is made from nickel chromium alloy, which has long-time useful life, the heating elements are sectional located in the furnace, and equipped with temperature controller which controlled by computer, to make sure the temperature is equal in the furnace, which is profitable for the electrical specification of iron core.
6. The main control system of the whole annealing processing (including evacuation, heating, heat preservation and cooling) is PLC, which can be controlled automatically; operating system can be industrial computer or touch-screen industrial computer, which can display the process flow and real-time processing curve directly, and processing data can be saved in hard disc or printed. |
Typical processing flow:
1. First, Put the iron cores into furnace by trolley, turn on vacuum system to evacuate the furnace, charge adequate high-purity nitrogen into furnace, turn on uniform-temperature fan, then turn on heating system (after achieved high vacuum degree, charge into pure nitrogen for heating, which is profitable for increasing the equality of temperature and decreasing heating time or decreasing heating loss when the temperature is less than 600℃); the temperature also can be equal without nitrogen, the furnace can be heated under vacuum state directly, but it will require more time for heat reservation so that the iron core can be heated completely; after the temperature achieved 600℃, turn on vacuum pumps again, evacuate out nitrogen, at this time, iron core can be heated under vacuum state because the thermal radiant efficiency is high enough.
2. At the beginning of heating, increase the temperature to 300℃ (speed: 150℃/hour), and reserving heat for 2 hours; then increase the temperature to 700℃ (speed: 100℃/hour); then increase the temperature to 850℃ (speed: 50℃/hour); and reserving heat for 2 hours when the temperature achieved 850℃.
3. After heat reservation, decrease the temperature by cooling to 500℃ (speed: 20-50℃/hour); charge into nitrogen again to 0.08Mpa after the temperature is less than 500℃; turn on cooling fan, decrease the temperature quickly by cooling to 100℃ then the processing can be finished.
Note: This processing flow is typical and for reference only, which can be properly adjusted as per the product characteristic of customer. |
Main differences between heat-outside annealing furnace and WZT vacuum annealing furnace:
1. The thermal efficiency of WZT vacuum annealing furnace is higher than heat-outside annealing furnace; the heating power of heat-outside furnace is around 40% higher than heat-inside furnace.
2. The heating element of heat-outside annealing furnace will be oxidated and damaged easily after connected with power under atmosphere, and the furnace flue also will be damaged easily after pulled and pushed into furnace; but the heating element of WZT vacuum annealing furnace will not be oxidated and damaged after connected with power under vacuum state.
3. The processing parameter of heat-outside annealing furnace is not accurate, annealing performance is not stable, it is a low-end equipment.
4. The heat-outside annealing furnace cannot meet the requirement of high capacity production and mass production. |
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Economic and efficiency analysis of WZT vacuum annealing furnace:
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| 1. According to the requirement of vacuum annealing, the temperature of all iron cores which put in different positions must be increased synchronous, so it requires the temperature must be increased slowly and equally to make sure all the iron cores in one cycle can have the same electrical specification after vacuum annealing treatment. In this case, the heating power of WZT vacuum annealing furnace can be less than common furnace, it only requires certain heating rate and unload loss, its heating power is only 60% of heat-outside annealing furnace. |
Technical target
Type: ingle chamber, horizontal
Maximum loading capacity: 5000kg
Usable heating area: 2600×1000×1200mm（LxWxH）
Maximum temperature: 900℃
Temperature equality: ±5℃
Maximum temperature-increasing-rate: ≥160℃/h(adjustable)
Increased temp. on the outside of furnace: ≤30℃
Ultimate vacuum: ≤20Pa(unloaded, cold condition)
Leak rate: 50Pa.L/s(cold condition)
Heating power: 165KW
Temperature control: automatically
Structure:
Vacuum furnace 1set
Heating system 1set
Vacuum system 1set
Cooling water system 1set
Cooling gas system 1set
Air-charging system 1set
Pneumatic system 1set
Electric control system 1set |
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