Leak detection using helium mass spectrometer in vacuum furnace?

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Improvement of oil circulation structure of rotary vacuum pump

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Based on rotary vane vacuum pump oil seal type something in industry application, makes the general rotary vane vacuum pump oil seal type medium vulnerable to pollution, emulsification and failure, still can cause oil hole plugging and exhaust valve damage, resulting in waste of oil pump, pump maintenance rate increased pump damage, even cause significant cost burden to users. If switch to other types of vacuum pump, such as slide valve pump, water ring pump, oil ring pump or dry pump, or the same results, or the performance can not meet the requirements or the cost can not afford. In view of the above situation, the oil circulation structure of the general oil-sealed rotary vane vacuum pump has been greatly improved. The oil of the existing general oil-seal rotary vacuum pump is discharged from the exhaust valve and then directly enters the pump chamber again. When the pump stops, the oil is easy to return into the pump chamber, causing the next start difficulty and oi...
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COPPER SOLDER VACUUM BRAZING DIAMOND

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VACUUM BRAZING DIAMOND DESCRIPTION: Current monolayer diamond grinding tool used in the industrial USES electroplating products, mostly due to a combination of coating and metal substrate and abrasive interface does not exist solid metallurgy chemical combination, abrasive just mechanical embedding framed in coating metal, thus holding force is not big, in the high efficiency grinding load heavy homework, abrasive easily for grinding grain fall off or peeling off and cause the overall failure of coating and to increase the holding force will have to increase the coating thickness, the result of abrasive dust exposed height and the space of reduced, grinding wheel easily blocked. Abroad since the early 1990 s, the research use high temperature brazing instead of developing a new generation of electroplating monolayer diamond tool, its starting point is to use in diamond, when high temperature brazing filler metals with parent metal interface on the possibility of interactions, such...
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Screw vacuum pump return oil how to do

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Screw vacuum pump long - term use of the process may encounter a problem: oil return. In addition to the screw vacuum pump without anti-oil return device, this phenomenon is more obvious when the screw vacuum pump stopped working, timely measures can reduce the loss The placement of the screw vacuum pump has nothing to do with the return of oil. It is the basic principle to prevent the return of oil to cut off the oil line when stopping the pump, eliminate the negative pressure in the pump chamber of the screw vacuum pump, reduce the liquid level difference and reduce the amount of returned oil: Screw vacuum pump shaft seal and static seal parts to be reliable, timely replacement Separate the oil near the exhaust valve of the screw vacuum pump from the rest of the oil, the oil level is only slightly higher than the partition wall The valve seat plane of the screw vacuum pump should be flat and the valve plate should be elastic The check valve structure is set so that...
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