Subao Pump Co.,Ltd.-Kunshan Branch
National Toll Free:215300
Address:Kunshan City Kunjia Road Punta money Road intersection south 100 meters
Pump for liquid delivery of mechanical, chemical centrifugal pump is one of them, it flows through the impeller through the impeller to the liquid by centrifugal force, improve the mechanical energy of the liquid, which for liquid delivery, it is an increase of liquid energy machine. Due to the special requirements of the pump in chemical production, chemical centrifugal pump has the following characteristics compared with other centrifugal pump:
( 1 ) to meet the needs of chemical process
Pumps in chemical industry, not only the necessary pressure conveying liquid material and process requirements to provide, must also ensure the delivery of the material quantity, in certain chemical unit operation, the required pump flow and head to maintain stability, high efficiency and reliable operation of the pump.
( 2 ) the corrosion
Chemical pump delivery of media, including raw materials, reaction intermediates and so on are mostly corrosive media. This requires the pump proper and reasonable material selection, ensure the safety, stability, pump long-lived operation.
( 3 ) high temperature, low temperature
High temperature medium chemical pump, a flow of liquid material, the reaction process is also required and the resulting heat carrier liquid. For example: the condensate pump, boiler feed water pump, oil pump. Low temperature medium type chemical pump delivery of also many, for example: the liquid oxygen, liquid nitrogen, methane, low temperature pump mostly in 20~ at 10 ℃. Whether high or low temperature chemical delivery pump, material selection and structure must be appropriate, must have sufficient strength, design, manufacture of pump parts can affect the thermal shock, thermal expansion and low temperature deformation, cold brittleness.
( 4 ) wear resistance, erosion resistance
Because of containing suspended solid particles chemical pump delivery of logistics, at the same time, the pump impeller chamber has some work under high pressure high flow rate, pump parts surface protection layer is destroyed, its life is short, so it is necessary to improve the wear resistance of chemical pumps, abrasion resistance, which requires the selection of materials, steel pump ceramics, cast iron wear-resistant, use erosion-resistant titanium, manganese steel.
( 5 ) reliability
Chemical pump reliable operation includes two meanings: one is the long period running without fault; the two is the smooth operation of the various parameters. Reliability is essential for chemical production. If the pump failure often occurs, not only to cause the current cut-off, affecting the yield and economic returns, but sometimes an accident may result in chemical systems. Chemical pump speed fluctuation, causes the flow and pump outlet pressure fluctuations, so the normal chemical production can not respond or system affected, the material can not balance, not only wasteful, causing the decline in product quality or the product.
( 6 ) no leakage or leakage
Medium most chemical pump delivery of flammable, explosive, toxic, hazardous liquid, once the leak will seriously pollute the environment, endanger the security and workers' physical and mental health, but do not meet the factory and no leakage of clean and civilized factory requirements, which must ensure that chemical pump run time does not leak, the use of new technologies, new materials the pump seal, according to operating procedures, quality maintenance.
( 7 ) to transport the critical state of the liquid
The critical state of the liquid, when the temperature or pressure reduction, often vaporization. Chemical pump can transport the critical state of the liquid, once the liquid in the pump vaporization, is easy to produce cavitation, cavitation performance which requires higher pump. At the same time, vaporization of the liquid, may cause friction bonding static and dynamic part of the pump, which requires the space to take larger. In order to avoid vaporization of the liquid to the mechanical seal, the packing seal, labyrinth seal due to dry friction and damage, the kind of chemical pump must have a place to pump the gas to remove the structure.
Critical state of fluid transport pump, the seal material can be used better self-lubricating properties of materials, such as PTFE, graphite etc.. The seal structure, in addition to the packing seal, can also be used for double mechanical seal and labyrinth seal etc.. Double mechanical seal, ends of the cavity between the surface, to seal filling liquid; with labyrinth seal, can be introduced into the seal gas with certain pressure from outside. Seal the liquid or gas leakage into the pump seal, the pumped media should be nothing wrong, if leaking into the atmosphere also sound. The critical state of liquid helium, such as transportation, the double mechanical seal the cavity can be used for sealing liquid methanol; delivery easy to vaporization of liquid hydrocarbon, the labyrinth seal can be the introduction of nitrogen.