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  • Product Name:U208-50 mechanical seal
  • Add Time:2018-01-29 17:06:55
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Introduction:

Brief introduction of mechanical seals

Mechanical seals belong to one of the mechanical components with complex structure and precision. They are the key components of all kinds of pumps, reaction kettle, turbo compressor, submersible motor and so on. Its sealing performance and service life depend on many factors, such as selection, precision of the machine, correct installation and use, etc.


Mechanical seal according to the working conditions and the medium properties are different, high temperature resistance, low temperature mechanical seals, pressure resistant, corrosion resistant mechanical seal, light hydrocarbon medium particle medium mechanical seal and adapt easy vaporization of the mechanical seal, should choose different according to different use types and materials of mechanical seal. Gorman in mechanical seals are widely used in various enterprises. Such as water pump plant, printing and dyeing machinery plant, paper mill, power plant, chemical plant, pharmaceutical shipyard and sewage treatment plant, and are widely used in hospitals, agriculture, equipment cooling, leather making industry, heavy machinery and so on.



The main parameters of the selection are: the sealing chamber pressure (MPa), the fluid temperature (c), the working speed (m/s), the characteristics of the fluid, and the effective space for installing and sealing.

The basic principles of selection are as follows:

1. according to the pressure of sealed cavity, it is determined that the seal structure is balanced or non - balanced, single end or double end.

2. according to the working speed, it is determined to adopt rotating or static type, fluid dynamic pressure type or non contact type.

3., according to the temperature and fluid properties, we can determine the friction pairs and auxiliary sealing materials, and correctly select lubrication, rinsing, thermal insulation, cooling and other mechanical seal circulation protection system.

4. according to the effective space for installation and sealing, it is determined to adopt multiple spring or single spring or wave spring, internal or external loading.

Requirements for installation and use of mechanical seals

1. mechanical seal requirements for machine precision (as an example of mechanical seal for pump)

(1) the maximum radial runout tolerance of the shaft (or shaft sleeve) that is installed in the mechanical seal is not more than 0.04 to 0.06mm.

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

(3) the maximum runout tolerance on the surface of the shaft (or shaft sleeve) is not more than 0.04 ~ 0.06mm when the sealing cavity is combined with the seal end cover.



Confirmation of 2. seal

(1) confirm whether the installed seal is in accordance with the required model.

(2) before the installation should be carefully compared with the assembly drawings, the number of parts is complete.

(3) the mechanical seal adopted by the coil spring drive, the spring has the left and right spin, and must be selected according to the rotating axis of the rotating axis.



3: installation

The installation method varies with the type of mechanical seal and the type of the machine, but its installation essentials are almost the same. The installation steps and matters of attention are as follows:

(1) determination of the size of the installation

During installation, the installation dimensions of mechanical seals should be ensured according to the instructions or samples of the products.

(2) before loading, the shaft (shaft sleeve) and cap should have no burr, and the bearing condition is good; the seal, shaft, seal cavity and cap should be cleaned and cleaned. In order to reduce friction resistance, the location of mechanical seal on the shaft should be coated with a thin layer of oil to lubricate. Considering the compatibility of the rubber O ring, if it is not suitable for oil, it can be coated with soap water. The floating type static ring does not carry the structure of the anti turn pin. It is not suitable to apply oil and should be loaded into the cover.

(3) the first static ring mounted on the shaft with gland, careful not to collide with the axis, then load ring components. The fastening screws of the spring seat or the drive seat should be tightened evenly in several times.

Before the fixed cover by pushing the compensation ring for axial compression and release the compensation ring bounce card hysteresis phenomenon, then the gland bolts evenly locking.



4: use

(1) when the transport medium temperature is too high or too low or contains impurity particles, flammable, explosive and toxic, we must take measures such as sealing, washing, cooling and filtration.

(2) before the operation of hand turning attention to the torque is too large, any scratchand abnormal sound.


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