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Mechanical seal device and application request

Update:22 Aug 2017
Summary:

   1, the mechanical seal on the machine's precision re […]

   1, the mechanical seal on the machine's precision request (pump mechanical seal as an example)
   (1) the mechanical seal parts of the shaft (or sleeve) radial runout maximum does not exceed 0.04 ~ 0.06MM.
   (2) rotor axial movement does not exceed 0.3MM.
   (3) seal the cavity and the sealing end of the positioning of the positioning of the face of the shaft (or sleeve) the appearance of the beating business does not exceed the maximum 0.04 ~ 0.06MM.
   2, the recognition of seals
   (1) to acknowledge that the seal of the installation is not in common with the type of request.
   (2) before the device carefully to the assembly diagram, the number of parts is not complete.
   (3) Selection and mechanical seal with a mechanical transmission, the tension spring has left and right rotation of the points, according to the rotation of the shaft to pick.
   3, device
   Device approach with the mechanical seal type, the type of machine is not the same and different, but the device is simply the same way, the device process and precautions are as follows:
  (1) the determination of the device scale
   Device, should be used in accordance with the instructions or samples of goods to ensure that the mechanical seal of the device scale.
   (2) before loading, shaft (bushings), gland should be no burr, bearing in good condition; seals, shaft, sealed chamber, gland should be clean and clean. In order to reduce the resistance of the conflict, the mechanical parts of the shaft device should be coated with a thin layer of oil for smooth, taking into account the compatibility of the rubber O-ring, if not oil, can be coated with soap and water. Float-type static ring without anti-dump structure, not oil, should be dry into the gland.
   (3) Install the static ring together with the gland on the shaft, be careful not to touch the shaft, and then load the moving ring assembly. Torsion seat or drive seat set screws should be evenly tightened several times.
   Before the gland is not fixed, push the ring with the hand to push the axial compression, release the ring after the release can automatically bounce back no hysteresis, and then tighten the gland bolts.
   4, use
   (1) When the transport medium temperature is too high, too low, or rich in impurity particles, flammable, explosive, toxic, it is necessary to take the appropriate blocking, scouring, cooling, filtration and other measures.
   (2) before the work of hand-car, pay attention to the torque is not too large, with or without rubbing and abnormal sound.
   (3) pay attention to the rotation, the coupling is not right, the bearing parts of the smooth oil addition is not appropriate, piping is not accurate.
   (4) before the work of the first medium, cooling water valve open, check the sealed cavity of the gas is not all discharged, to avoid static pressure caused by leakage, and then boot operation.
   (5) after the operation is not normal stability, whether the rotation caused by the axis of the abnormal torque, as well as abnormal sound and overheating scene.

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