How To Install And Use Mechanical Seals in Vacuum Pumps And Diaphragm Pumps
1.Requirements about machine precision: (take the mechanical seal of the vacuum pump as an example)Get more news about Vacuum Pump Seals,you can vist our website!
(1) The radial runout tolerance of the shaft (or shaft sleeve) where the mechanical seal is installed shall not exceed 0.04-0.06mm at most.
(2) The axial movement of the rotor does not exceed 0.3mm.
(3) The runout tolerance of the joint position of the sealing cavity and the sealing end cover facing the surface of the shaft (or shaft sleeve) shall not exceed 0.04-0.06mm.
2. Check and confirmation of the mechanical seals:
(1) Check whether the installed mechanical seals are the same as the required models.
(2) Before installation, carefully check with the general assembly drawings to see if the parts are complete.
(3) For mechanical seals driven by parallel springs, they can be divided into left or right handed ones, and must be selected according to rotation directions of the rotating shafts.
3. Installation method of such mechanical seals:
Installation methods vary with types of mechanical seals and types of machines, but installation essentials are almost the same. The installation steps and precautions are as follows:
(1)Determination of installation size: During installation, installation size of the mechanical seal should be guaranteed right according to the product instruction manual or sample book.
(2) Before loading, the shaft (sleeve) and gland should be free of burrs, and the bearing should be in good condition; the seals, shaft, sealing cavity and gland should all be cleaned. In order to reduce frictional resistance, the place where the mechanical seal will be installed on the shaft should be coated with a thin layer of oil for lubrication. If oil is not suitable because of the compatibility of rubber O-rings, soapy water can be applied. The structure of floating stationary seat without anti-rotation pin should not be oiled, and should be installed in the gland dry.
(3) Install the stationary seat of the mechanical seal together with the gland on the shaft first（being careful not to collide them with the shaft）, and then install the rotary face assembly. The set screw of the spring seat or transmission seat should be evenly tightened several times.