Vacuum heat treatment furnace

Theoretical analysis of rapid leakage of vacuum heat treatment furnace
Vacuum degree drops quickly, need not consider more commonly, affirmation exists leak point. It is much easier to find the cause of rapid leakage than the trace leakage, and the problem can be solved by the method of theoretical analysis, at most supplemented by a simple leak detection method, the leakage point can be found. The basis of theoretical analysis is data. Without real and detailed data, it is impossible to carry out theoretical analysis. When the vacuum degree of the vacuum heat treatment furnace is abnormal, it is necessary to observe in detail the process of vacuum degree decline, the working condition of the equipment before and after the vacuum degree decline, and the data changes of each indicating instrument on the equipment, including the changes of the backfilling pressure gauge. These data are important basis for theoretical analysis. Sometimes theoretical analysis based on data changes can even directly find the leakage point. The following are two practical examples of finding leakage points by applying theoretical analysis.
Someone once in normal operation and in the process of the vacuum degree of vacuum furnace heating area suddenly falling fast, observe the vacuum quenching area basic normal did not change, after the vacuum heating area is lower than the vacuum quenching, vacuum heating area is still falling, vacuum quenching area or normal without big changes, send equipment operator monitor the performance of the equipment heating zone on the vacuum pump, returns are working properly. Process is in the process of pneumatic back, immediately let the equipment the operator to check back to the aeration tank pressure gauge, the changes of aeration tank back pressure in the continuous decline, preliminary confirmation could be back to the charging valve has a problem, let the operator immediately turn off the air supply valve of gasholder, the vacuum degree of heating area then began to rise, which confirmed that really is back to the charging valve leakage caused by heating in vacuum. Standing in the control room to observe the changes in the instrument, send the operator to separate to check the pump and gas tank changes, within 3 minutes to troubleshoot the fault. In fact, I thought a lot at that time. First of all, the failure of the measurement system was eliminated. It will not be caused by the surface of the workpiece in the vacuum chamber, because it will not produce such a large amount of degassing; It must have been a sudden big leak. This kind of leakage hole leakage generally does not occur in the static seal, occurs in the dynamic seal, immediately think of heating zone dynamic seal there are several, the current state of work and which part, since it is in the process of hot zone back inflation, so it is the problem. Maintenance valve after the furnace, fundamentally solve the problem. Another example is the vacuum in the quenching zone. The equipment: by the main rough mechanical pump and roots pump composition of the pumping system, simultaneously connected to the hot and cold areas, when the furnace is first by its pumping hot area, when the hot area reaches a certain degree of vacuum, by it to pumping cold area, and then by the front mechanical pump and diffusion pump composed of the pumping system pumping hot area. Once the furnace is opened, the main rough mechanical pump and roots pump composed of the exhaust system exhaust heat area, and then transferred to the exhaust cooling area, by the front mechanical pump and diffusion pump exhaust heat area of the exhaust system. Hotspot has reached the ultimate vacuum, vacuum and the vacuum can not meet the requirements of cold area, check the work state of pump works, mechanical pump also gas town on a regular basis, a preliminary judge cold area for leaks, hot vacuum is normal, that is not the door in the middle of the problem, if the middle door for leaks, the vacuum degree can improve instead of cold area, because of the hot spots of high vacuum degree, front of mechanical pump and diffusion pump smoke extraction system can help the cold area. The front door is the only moving part in the cold zone. It is suspected that there is a problem with the sealing of the front door. Furthermore, it is the easiest to check the sealing of the front door, and there is no need to dismantle the equipment.
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