Chemical pump should be tight grasp the development opportunity

chemical pump is the integrated design of the energy-saving pumps, pump performance, technical requirements, according to international standard ISO2858 specified performance and size design, chemical pump advantages: full range of hydraulic performance layout is reasonable, the user to select a wide range of 'open back' structure, maintenance convenience, efficiency, and has reached the international advanced level of suction. Chemical pump classification: stainless steel chemical pump, plastic chemical water pump, fluorine plastic chemical pump, electric chemical pump, pneumatic chemical pump. Chemical pump seal form mainly has: oil seal, gasket seal and screw seal and labyrinth seal, packing and dynamic seal, mechanical seal. Chemical pump is a kind of since the tight lipped seal, it has simple structure, small size, low cost, easy maintenance, resistance torque is small, can not only prevent medium leakage, also can prevent external dust and other harmful substances into, and have certain compensation ability to wear, but not resistant to high pressure, so commonly used in the chemical pump on occasion. Gasket is the basic element of centrifugal pump is static seal, using range is very wide. Gasket selection is mainly according to the chemical pump transmission medium, such as temperature, pressure and corrosion factors. There are generally two kinds of forms in the chemical pump, gasket seal is a kind of thread connection, is a kind of thread and fill seal, both for small diameter threaded connection sealing occasions. Threaded coupling electric diaphragm pump sealing gasket seal gasket, and thread only provides the function of compression force. Chemical pump in reasonable design, fine processing, assembly in good condition, high speed, the labyrinth seal effect is very good. But in practice, thus has many chemical pump leakage, so not commonly used in the chemical pump seal. Chemical pump is full of compressibility and resilience of filler in the stuffing box, relying on the gland of axial compression force into radial sealing force, so as to play a role of sealing. This sealing method called packing seal, this packing is called packing. Because of the packing seal structure is simple, easy to change, price is low, to adapt to the speed, pressure, medium broad and widely used in the design of the chemical pump. Chemical pump in operation, the deputy impeller head balance produced by the primary impeller exit of high pressure liquid, so as to realize seal. When parking, vice impeller doesn't work, so must be equipped with a parking sealing device to solve the possible chemical pump leakage. Vice impeller seal of simple structure, reliable sealing, long service life, chemical pump operation can be realized in the way too tight, so in the chemical pump with impurity media frequently used on the pump. Now most widely used form of seal, chemical pump industry due to the mechanical seal has the advantages of less leakage and long service life, so the mechanical seal in the world today is in the equipment of the main shaft seal. Seal, mechanical seal and face in the relevant national standard is defined like this: 'by at least a pair of end face perpendicular to the rotation axis in fluid pressure and compensation institution stretch ( Or magnetic force) With the cooperation of role and auxiliary seal up keep post merger relative sliding and prevent fluid leak device. Chemical pump seal problem is the forever pursuit of chemical equipment without leakage, it is the request to the application of the shielding pump magnetic pump and expanding. But really no leakage is still a long way to go, such as magnetic pump isolation set of shielding and shielding pump sets of life problem, the material of pitting corrosion problem, the reliability of static sealing and so on. Now on sealing some basic situation introduction is as follows: ___________ for static seal, seal form usually only seal and seal two forms, and sealing ring with o-rings used most widely; For dynamic seal, chemical pump packing seal, is scarcely used to is given priority to with mechanical seal, mechanical seal and single face and double face, equilibrium and non-equilibrium model, equilibrium model is suitable for high pressure sealing medium ( Usually refers to the pressure is greater than 1. 0MPa) , double end face machine is mainly used for high temperature, easy to crystallization, viscosity, and toxic volatile medium including particle, double end face machine sealing should be added spacer to the sealed cavity, the pressure is generally higher than that of medium pressure 0. 7 ~ 0. 1MPa。 This chemical pump seal material static sealing materials generally adopts the fluorine rubber, special situation to adopt ptfe material; Mechanical seal ring materials configuration is the key activity, not carbide carbide is best, the price is high on the one hand, both no hardness difference is not reasonable, so it's best to discriminate based on the medium. ( Note: the American petroleum institute API 610 version 8 typical configuration of mechanical sealing and piping system are detailed in appendix D) Chemical pump viscosity problem of medium viscosity affect the performance of the pump is great, when the viscosity increases, the chemical pump head curve dropped, the best working condition of the head and flow rate are down, while the power, and low efficiency. Generally the parameters for conveying water on the sample performance, when conveying viscous medium should be reduced ( Different viscosity correction factor can be refer to the relevant conversion chart) 。 For high viscosity pulp, cream and viscous fluid conveying, suggest use screw pump, G single screw pump suitable medium viscosity of up to 1000000 CST.

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