Vacuum pump, diaphragm pump mechanical seal installation and use requirements

1. Mechanical seal requirements for machine accuracy: (taking the mechanical seal of a vacuum pump as an example)

(1) The radial runout tolerance of the shaft (or bushing) on ​​which the mechanical seal is installed shall not exceed 0.04 to 0.06 mm.

(2) The axial movement of the rotor does not exceed 0.3 mm.

(3) The locating tolerance of the positioning end face of the sealing cavity combined with the sealing end cap to the shaft (or bushing) surface is not more than 0.04 to 0.06 mm.

2. Confirmation of seals:

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

(2) Before installation, carefully compare with the assembly drawing, and the number of parts is complete.

(3) The mechanical seal adopting the parallel spring transmission, the spring has the left and right rotation points, and must be selected according to the rotation direction of the rotating shaft.

3, the installation method of the seal:

The installation method varies with the type of mechanical seal and the type of machine, but the installation methods are almost the same. The installation steps and precautions are as follows:

(1) Determination of installation dimensions: When installing, the installation dimensions of the mechanical seal should be guaranteed according to the product's instruction manual or sample.

(2) Before loading, the shaft (sleeve sleeve) and gland should be free of burrs and the bearing condition is good; the seal, shaft, seal chamber and gland should be cleaned. In order to reduce the frictional resistance, the mechanical seal on the shaft should be thinly coated with a layer of oil for lubrication. Considering the compatibility of the rubber O-ring, if it is not suitable for oil, it can be coated with soapy water. The floating static ring does not have an anti-rotation pin structure. It should not be oiled. The gland should be installed dry.

(3) First install the static ring and the gland on the shaft, taking care not to touch the shaft, and then load the moving ring assembly. The set screws of the spring seat or the drive base should be tightened evenly several times.

Before the gland is fixed, the compensating ring is manually pressed for axial compression. After the loosening, the compensating ring can automatically spring back without jamming, and then the gland bolt is evenly locked.

Main: circulating water vacuum pump , agitator, dryer, drying oven, reaction kettle