Chemical pumps are widely used in chemical, petroleum, metallurgy, light industry, synthetic fiber, environmental protection, food, medicine and other departments, to improve product quality, reduce run, run, drip, drain, prevent pollution, improve the environment, play a big role . How does it achieve high seal? This question can be explained from the following two aspects. 1. Sealing For the static seal, usually only two forms of seals and seals, and O-ring seal again the most widely used; for dynamic seals, chemical pumps rarely use packing seal, the main mechanical seal , Mechanical seal has a single end and double end, balanced and unbalanced type, balanced type for high pressure medium seal (usually refers to the pressure greater than 1.0MPa), double end machine seal is mainly used for high temperature, easy to crystallize, there is Viscosity, containing particles and toxic volatile medium, double-ended machine seal should be injected into the sealed chamber isolation fluid, the pressure is generally higher than the medium pressure 0.07 ~ 0.1MPa. 2. Sealing material Chemical pump static sealing materials generally use fluorine rubber, special circumstances only use PTFE material; mechanical seal ring static material configuration is more critical, not cemented carbide is the best on the cemented carbide, the price is high On the one hand, the hardness difference between the two is not reasonable, so it is best to distinguish between media characteristics. According to the conditions of use Chemical pump classification: 1) large flow and micro-flow pump: flow were 300m3 / min and 0. O1L / min; 2) high temperature pump and cryogenic pump: high temperature up to 500 ℃, low temperature to a Z53 ℃; High pressure pump and low pressure pump: high pressure up to 200MPa, vacuum degree is 2.66 --- 10.66kPa (20-80mmHg); 4) high speed pump and low speed pump: high speed up to 24000r / min, low speed 5-10r / min; Metering pump: flow measurement accuracy of ± 0 3%; 6) high viscosity pump: Viscosity up to several thousand Pa (Pa · s). According to the transmission medium chemical pump classification: 1) Pump: Including water pump, boiler feed pump, condensate pump, hot water pump. 2) Corrosion-resistant pump: Including stainless steel pump, high silicon cast iron pump, ceramic acid pump, impermeable graphite pump, hard rubber pump, hard polyvinyl chloride pump, shield pump, diaphragm pump, titanium pump and so on. 3) Impurity pump: Including slurry pump, sand pump, sewage pump, pulverized coal pump, ash pump and so on. 4) oil pump: cold oil pump, hot oil pump, oil pump, liquid hydrocarbon pump. Chemical Chemical Pumps Category: 1) Process Pumps: including feed pumps, return pumps, circulation pumps, flushing pumps, sewage pumps, replenishment pumps, pump output and so on. 2) Utility Pump: Including boiler pump, cooling tower pump, fire pump, water pump with deep well. 3) Auxiliary use pump: Including lubricating oil pump, seal pump, hydraulic pump and so on. 4) pipeline pump: pipeline pump, loading and unloading pump and so on. In accordance with the working principle, the structure of the chemical pump classification: 1) vane pump: driven by a variety of impeller blades to the liquid to the centrifugal force or axial force through the pump shaft to transport liquid to the pipeline or container, such as centrifugal pump, vortex pump, mixed flow pump, Axial flow pump. 2) positive displacement pump: the use of continuous changes in the volume of the pump cylinder liquid delivery pump, such as reciprocating pump, piston pump, gear pump, screw pump. 3) Other types of pumps: Electromagnetic pumps that use electromagnetic to deliver liquid electrical conductors; Pumps that use fluid energy to deliver liquids, such as jet pumps, air boosters, etc.
Shattaf Kit
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