Mechanical Seal Selection Methods And Their Use Required - Seals, Pumps - Pump Industry

Machinery Seal Pieces are sophisticated, more complicated mechanical structure

, based on components is one of a variety of pumps, reaction kettle, turbo compressors, diving equipment, electrical and other key components. Its Seal Performance and service life depends on many factors, such as selection, the machine precision, the correct installation and so on.

I. Selection method Mechanical seal according to the nature of working conditions and the different media, with high temperature, low temperature mechanical seal, high pressure, corrosion-resistant mechanical seals, mechanical seals and medium resistance to particle vaporization of light hydrocarbon easily adapt to the medium mechanical seals, etc. use should be selected according to different structural types and materials of different mechanical seal.

Selection of the main parameters are: sealed chamber pressure (MPa), fluid temperature ( ), working speed (m / s), fluid properties and install the seal of the effective space.

Selection of basic principles: 1. Under seal chamber pressure to determine the seal structure using balanced or unbalanced type, such as single face or double face.

2. According to the speed of work, determine the use of rotary or static, fluid dynamic pressure type non-contact type.

3. According to the temperature and fluid properties, determine the friction pair and secondary seal material, and the correct choice of lubrication, washing, heat, cooling, mechanical seal loop protection system.

4. Under the seal of the available space to install to determine the use of a single spring or multiple springs or wave springs, interior style, or externally mounted.

Second, mechanical seal installation and use requirements

1. Mechanical seal on the machine precision requirements (for example mechanical seal pumps)

(1) installation of mechanical seals of the shaft (or sleeve) and the maximum radial runout tolerance of not more than 0.04 ~ 0.06mm.

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

(3) sealed chamber combined with the sealing cover end face of the positioning shaft (or sleeve) beating the surface of the maximum tolerance of not more than 0.04 ~ 0.06mm.

2. Seals confirmation (1) to confirm the installation of the seal is consistent with the requirements model.

(2) carefully before installation and assembly map control, the number of parts are complete.

(3) the adoption and transmission of the mechanical seal ring spring, the spring has left and right of the points of the rotating shaft has always been subject to selection.

3. Installation Installation method with the mechanical seal types, the types of machines vary, but the installation of almost all essentials the same installation steps and precautions are as follows:

(1) determine the size of installation

Installation, should be the product manual or the sample size to ensure the installation of mechanical seals.

(2) pre-loaded shaft (sleeve), gland should be no burr, bearing in good condition; seals, shaft seal cavity, gland should be cleaned. To reduce friction, the shaft to install the mechanical seal parts to be coated with a thin layer of oil for lubrication, taking into account the rubber O-ring compatibility, if not oil, can be coated soapy water. Float-mounted anti-static ring resale without the structure, not oiled, should be dry mounted gland.

(3) with the first stationary ring and disc mounted on the shaft, careful not to collide with the axis, and then ring components into. Block Spring Block or drive several times set screws should be tightened evenly.

Fixed gland without prior compensation he pushed the ring for axial compression, release the ring after the compensation automatically bounced back cable wiring, and then evenly tighten gland bolts.

4. Use (1) when the transmission medium temperature too high, too low, or contain impurities particles, flammable, explosive, toxic, must take the appropriate block letters, washing, cooling, filtration and other measures.

(2) operation before hand drive cars, pay attention to whether the torque is too large, with or without a collision and abnormal voice.

(3) Note that rotation, whether the coupling, the bearing parts of the lubricant additive is appropriate piping is correct.

(4) before the first media operation, cooling water Valve Open, check the seal cavity is full of gas discharge, to prevent static pressure caused by leakage, and then switched on.

(5) After the work is normal and stable driving, whether caused by abnormal axial rotation torque, and abnormal noise and overheating.

by: gaga

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