Water ring vacuum pump is equipped with an eccentric rotor with a fixed blade, the water (liquid) thrown to the stator wall, the water (liquid) to form a liquid ring and the stator concentric, liquid ring and rotor blades together to form a variable volume A rotary variable volume vacuum pump. Today Xiaobian introduce water ring vacuum pump mechanical seal leak reasons, interested friends to share it! Analysis: water ring vacuum pump mechanical seal leakage reasons 1, mechanical seal assembly improper replacement of non-power end machine seal, the demolition process Found in the ring seal O-ring is not installed. O-ring should be installed into the seat ring seat seal groove inside, and demolition inspection found that the O-ring is not so installed, but wrong installed in the spring positioning sheet, resulting in deformation of the spring, can not fully stop the axial static seal The role of causing leakage. 2, machine seal cooling water pressure is too large machine sealing ring sealing surface of the fit force is applied by the spring on the ring. When the cooling water pressure is too large, the water pressure will act on the static and dynamic ring, the static ring is stationary, so the hydraulic pressure will promote the ring, to the opposite direction of the static compression spring, thus weakening or offset static and dynamic annulus The bonding force, resulting in leakage of sealing surface. After the overhaul to the power end machine seal into the cooling water leak test, inlet valve open 2/3, the machine seal intact, when the water valve open more than 2/3, the machine seal leakage. The initial judgment is caused by the reason of excessive water pressure. It is suggested to be turned on after the motor is repaired and used to further trace the real cause of leakage. 3, static and dynamic ring seal surface rupture This is the first time to replace the pump seal leak the main reason. The power end and the non-power end machine seal are assembled on the same shaft, the impeller is installed in the middle of the shaft, and both ends of the shaft are mounted with bearing support and fixed. When replacing the power end or non-power end machine seal separately, the bearing (bearing seat) of the corresponding end must be disassembled to remove the old machine seal and install the new machine seal. At this time, because of the gravity of the shaft and impeller, the one end bearing support The impeller and the shaft will inevitably fall down and the shaft will be tilted to the bearingless end. Because the unassembled end of the static ring is bolted to the pump cover fixed, and moving ring is fixed on the shaft with the shaft rotation, the other due to the static ring inner ring and the shaft with a small gap, when the shaft collapsed Tilt, will result in: a, not removed at one end of the static and dynamic ring relative displacement, so that the static and dynamic ring sealing surface of each other illegally squeezed, causing fragmentation; b, the shaft is pressed directly on the end of the static ring static ring, resulting in static ring Sealing surface broken or broken. (Editor: Li Juan)
Drill and tap set
Taps and dies are tools used to create purpose screw threads, which is called threading. Many are cutting tools; others are forming tools. A tap is used to cut or form the female portion of the mating pair (e.g. a nut). A die is used to cut or form the male portion of the mating pair (e.g. a bolt). The process of cutting or forming threads using a tap is called tapping, whereas the process using a die is called threading.
Using an ordinary tap or die to clean threads generally removes some material, which results in looser, weaker threads. Because of this, machinists generally clean threads with special taps and dies-called chasers-made for that purpose.
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