Mechanical seal for kettle Selection and use of

1. Requirements of mechanical seal on machine precision (taking pump mechanical seal as an example)

(1) The radial runout tolerance of the shaft (or shaft sleeve) installed at the mechanical seal shall not exceed 0.04~0.06MM.   

(2) Axial displacement of rotor shall not exceed 0.3mm.   

(3) The runout tolerance between the locating end face of the seal cavity and the seal end cover and the shaft (or shaft sleeve) surface shall not exceed 0.04~

0.06MM。   

2. Confirmation of mechanical seal for pump

(1) Confirm whether the installed seal is consistent with the required model.   

(2) Before installation, carefully compare with the general assembly drawing to see if the number of parts is complete.   

(3) For mechanical seal driven by parallel coil spring, its spring can be left or right rotation, which must be selected according to the rotation direction of the shaft.   

3. Installation of pump mechanical seal

The installation method varies with the type of mechanical seal and the type of machine, but the installation essentials are almost the same, and the installation steps

And precautions are as follows:

During installation, the installation dimension of the mechanical seal shall be ensured according to the product instructions or samples.   

(2) Before installation, the shaft (sleeve) and gland shall be free of burrs and the bearing shall be in good condition; Seals, shafts, seal chambers and glands shall be cleaned. To reduce friction resistance

Apply a thin layer of oil on the part where the mechanical seal is installed on the shaft for lubrication, considering the compatibility of rubber O-ring

If oil is not suitable, apply soapy water. The floating static ring without anti rotation pin should not be oiled and should be installed into the gland dry.   

(3) First install the stationary ring and the gland together on the shaft, taking care not to collide with the shaft, and then install the moving ring assembly. Spring seat or transmission

The set screws of the seat should be tightened evenly in several times. Before the gland is fixed, push the compensating ring manually for axial compression, and compensate after loosening

The ring can spring back automatically without clamping stagnation, and then the gland bolts are locked evenly.   

4. Use of pump mechanical seal

(1) When the temperature of the conveying medium is too high, too low, or contains foreign particles, which are flammable, explosive, or toxic, corresponding resistance measures shall be taken

Sealing, flushing, cooling, filtering and other measures.   

(2) Before operation, turn the gear by hand, and pay attention to whether the torque is too large, whether there is friction and abnormal sound.   

(3) Pay attention to the rotation direction, whether the coupling is aligned, whether the lubricating oil addition at the bearing is appropriate, and whether the piping is correct.