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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Rainwater pumping station and confluence pumping station

　 The basic characteristic of rainwater pumping station is large flow and small head, therefore. Axial-flow pumps are mostly used, and sometimes mixed-flow pumps are used. The general process flow of rainwater pumping station is as follows: Inlet pipe:'inlet gate well, grit tank, grid room, foretank, and catch basin' water outlet and one outlet pipe, outlet gate well and outlet. For combined pumping stations, the catch basin is generally sewage and rainwater combined, and the pump It can be set separately or shared. Basic types of pump rooms The rainwater pump house (combined pump house) is generally built together with the collection tank and the pump. According to whether the ditch pool and the pump are separated by unsuitable partition walls, they are divided into "dry room" and "wet room". The "dry room" pump room (as shown in Figure 5. Lo) is generally divided into three floors. The upper floor is the motor room. Install motors an...
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