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What's wrong with vacuum stove not being pumped up?

There may be several reasons why vacuum furnace can't be pumped. We must find out what is the reason. Is the pumping capacity of vacuum unit insufficient or the leakage rate high? Or both? We need to observe and record patiently to find out the cause of the failure. If the vacuum furnace evacuation time is the same and the vacuum degree is low, then close the high-pressure valve, such as the vacuum gauge pointer drops quickly. In most cases, the vacuum chamber leaks. Leakage points should be found first. If the pointer drops very slowly, most of the cases are that the pumping capacity of the vacuum unit is insufficient, then we can focus on finding the problems of vacuum pumps and valves, to see where leakage occurs, or diffusion is polluted, oxidation, etc. or the front pipeline is not well sealed, pump oil is insufficient; or the pump has oil emulsification, shaft seal leakage, valve piece damage and other faults.
vacuum annealing furnace
Leakage detection can be divided into internal leakage and external leakage; leakage detection is better, but internal leakage is more difficult. The larger leakage point can be found by flame method, using the principle that air flow can make the flame deviate. First vacuum is pumped, and then candles or lighters are used to search around the suspicious point step by step. It will be found that the flames move towards the leakage point and the leakage point can be found. Internal leakage should be checked from different vacuum working areas of the vacuum furnace. After the vacuum system reaches a certain pressure value, the winding and evaporation systems are started respectively, and the reading of the vacuum gauge can be observed to ascend after a short time, so the direction of the internal leakage point can be preliminarily judged. Internal leakage mostly occurs in equipment with water cooling point. No doubts have been found in leakage inspection, but there are the following phenomena: the pumping speed of mechanical pump is obviously low, the indication value of vacuum gauge is low, the oil of mechanical pump is very high, the iron-based parts in vacuum chamber are obviously corroded, etc. With the above conditions, it can be concluded that internal leakage can be basically inferred. First, the cavity is cleaned up, then the cooling water is opened, and the pipeline is carefully inspected. There is no wet point. The wet point is the leak point. Conventional maintenance can let the maintenance personnel check and do it step by step, but if the equipment fails under emergency conditions, the experimental task can not stop. At this time, as long as the fault is judged accurately, all available materials such as vacuum sealing mud, vacuum sealing wax, 704 silicone gel, vacuum chamber plate and so on, can be repaired as long as there is no conflict with the products, the principle of emergency can be applied. It is to damage the equipment and do not affect the normal operation of the equipment in the case of experimental materials.

 
Vacuum furnaces are not a single part of the problem in many cases, which makes it difficult to take comprehensive consideration in fault investigation. Some are caused by inadequate precision in mechanical assembly, some are problems in material rejection or structure. At this time, do not rush to draw conclusions, do not rush to disassemble equipment, should seriously investigate and analyze the fault phenomenon, and consult the equipment manufacturers'professionals to avoid mistakes. Dismantling is an unnecessary loss. Good vacuum degree is the premise of the operation of vacuum furnace. In daily use, we should carefully and conscientiously do daily maintenance to prevent minor and major hazards.

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