Pharmaceutical delivery pump is an essential equipment of liquid materials, mechanical seal leakage problems over the years has been plagued by maintenance personnel. Of course, mechanical seal leakage of a variety of reasons, not to generalize, but to be precise to determine quickly the cause, and to develop a reasonable maintenance program, to be on the mechanical seal structure, working principle and the factors affecting its normal work understand, so as to do more with less. This combined with years of accumulated experience on the maintenance of pumps, mechanical seal leakage summarized the reasons, summed up the phenomenon for different maintenance methods.

    A mechanical seal structure characteristics and working principle

    Mechanical seal is a widely used rotary dynamic seal assembly axis, also known as seal. It consists of at least one rotation axis perpendicular to the face formed by fluid pressure and stretch compensation mechanism (or magnetic) effect this end, coupled with the secondary seal affixed to merge to remain relatively sliding joints, so as to achieve to prevent fluid leakage purposes. The working principle of the mechanical seal is formed between the rotating ring and the axis of thin liquid film, to prevent media leaks, but also to lubricate the end, so as to achieve sealing effect. Mechanical seals used in pumps, compressors and other rotating agitator response machinery.

    Pump seals and 2 common kinds: mechanical seals and for soft packing. They each have different characteristics, but also for different occasions. Proper use helps reduce costs and improve efficiency. Mechanical seals and for soft packing seal compared with the following advantages:

    (1) sealed and reliable. In the long run is very stable in the closed state, a small amount of leakage, the leakage of about 1% of the soft packing seal. (2) long service life. In the oil, water media, generally up to 1 ~ 2a useful life of more stability in the chemical medium to

    Be used for 6 months.

    (3) friction power consumption is small. The friction power is only the soft packing seal 10% to 50%, the wear on the shaft or set of basic negligible.

    (4) maintenance cycle length. Face wear in a certain range after the patch, still meets the requirement.

    (5) earthquake resistance. The vibration of the axis of rotation, and deflection of the deflection axis of the sealed chamber is not sensitive.

    Of course, compared with soft packing seal, mechanical seal structure of complex parts that require high processing cost is high; on the personnel operating the installation and replacement are required to have a certain level of technology, master the basics of fitter to understand mechanical the structural features of seal, especially for pump operation in handling incidents, requiring maintenance personnel to have some business knowledge and experience accumulation.

    2 of the pump mechanical seal with the effect of factors

    Use of the pump mechanical seal main factors effect the selection, installation, routine maintenance and so on.

    2.1 Selection

    Pump selection is reasonably safe and normal operation of the premise. Mechanical seal selection is based on the work of the media use of pressure, temperature, shaft, medium characteristics, installation environment, allowing leakage and other parameters to be selected. Use of the process in the factory, according to JB1472-75 can be a variety of standard mechanical seals for pumps to choose to use.

    2.2 Installation

    Reasonable right to choose the mechanical seal, the installation is to ensure the efficacy of mechanical seals play an important part. First, the installation process should be stressed that:

    (1) The installation process should always be kept clean, especially the rotating ring and the stationary seal ring seal surface and the supporting surface should be free of impurities, dust, and never allow the dirty cloth with the sealing surface