Wire Spring,Double Torsion Spring Design,Spring Steel Wire,Stainless Steel Spring Wire
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wire thickness : 0.07--5mm
applicaiton: viation,automotive, motorbike, bicycle, automatic equipment, household appliance, medical device ,toy, telecommunication,computer, instrument and meter,furniture, electric tools,mold and other industries
Wire Spring,Double Torsion Spring Design,Spring Steel Wire,Stainless Steel Spring Wire Shenzhen Lanejoy Technology Co.,LTD , https://www.grill-mesh.com
Centrifugal pump related knowledge
Centrifugal pumps rely on high-speed rotation of the impeller, leaving the liquid get head (or head). When the pump is full of liquid, the liquid between the impeller blades is rotated by the blades due to the high-speed rotation of the impeller; under the action of centrifugal force, the liquid continuously flows around the center and enters the volute and is discharged through the discharge tube . When the liquid flows from the center to the periphery, a low pressure (below atmospheric pressure) is formed at the center of the impeller. Under atmospheric pressure, the liquid enters the pump from the suction tube to replenish the discharged liquid. The energy obtained by the rotation of the liquid by the impeller is converted from kinetic energy into potential energy (indenter) by the action of the volute. Therefore, the centrifugal pump can both transport the liquid and increase the pressure of the liquid. Centrifugal pump prior to work, the pump must be pre-filled with liquid to pump the air to exclude, because if the pump to save air, the work can not be formed enough vacuum, the liquid can not be inhaled or flow is small. To this end, at the inlet end of the centrifugal pump are generally equipped with a bottom valve (check valve) to ensure that the pump and suction pipe filled with liquid. Centrifugal pump up to hundreds of types, commonly used for the following categories: A, B (IS) type single-stage single-suction cantilever centrifugal pump It is the most commonly used centrifugal pump, can be used to transport water or water properties Close to the clean liquid; the amount of liquid transported 4.5 ~ 360m³ / h, lift 8 ~ 98 m liquid column. According to the latest standards, B-type pump should be IS type. It is simple in structure, convenient in operation and versatile. B (IS) pump, A, B two models, their performance is the same, but the pump casing is not the same demolition, the former pump casing is the front demolition, while the latter is removed from the back. It also has several variants, such as BL and BZ type, the pump body directly connected to the motor flange, eliminating the pump shaft, bearings, brackets, couplings and so on. Second, the Sh-type double suction centrifugal pump It is a single-stage, double-suction pump casing and open the centrifugal pump, mainly for the transport of water or physical, chemical properties similar to water; head to 9 ~ 140 m, flow 126 ~ 12500 m³ / h, liquid temperature does not exceed 80 ℃. It is suitable for factories, mines, urban water supply and farmland irrigation and drainage. Sh-type pump inlet and outlet are below the centerline of the pump shaft, into the horizontal direction, perpendicular to the axis. The combination of the pump cover into the horizontal split; pump body is horizontally split spiral volute. It uses double suction impeller, it is equivalent to two single-stage impeller work in parallel, large flow. Open the pump cover to overhaul. Third, multi-stage centrifugal pump It is used to transport water and water similar to the liquid, a segmented, open and double-shell type three. 1, multi-stage multi-stage centrifugal pump multistage centrifugal pump body is vertical split multi-stage, from a front section, a tail section and several intermediate components, with four or more even through the threaded bolt connection Together; pump shaft equipped with a number of impeller, each impeller with a guide wheel will be transported liquid kinetic energy into static pressure, between the impeller with the sleeve positioning; both ends of the shaft bearing support and placed in the bearing body ; The shaft seal is symmetrically distributed at the front and the tail shaft of the pump; the impeller is sequentially connected in series with the impeller in the direction of the inlet of the impeller, and the balance impeller is installed behind the final impeller to balance the axial force automatically. Multistage pumps are also many types, such as D-type, GD single-suction multistage centrifugal pumps and DA type, DY single suction multistage centrifugal pump, used to transport high-lift liquid. 2, the open multi-stage centrifugal pump It is mainly used for large flow, high head for water supply and drainage and pipeline; flow of 450 ~ 1500 m³ / h, the maximum lift up to 1800m water column. The pump uses a volute pump body, each impeller has a corresponding volute, the equivalent of several single-stage volute pump in series in a shaft work, it is also known as the volute-type multi-stage pump. Due to the level of the pump body is divided, suction and discharge port are cast in the pump body, so that maintenance is very convenient. The impeller is usually an even number of symmetrical arrangement, eliminating the axial unbalanced force, it does not require axial force balance device. 3, double-shell multistage centrifugal pump The pump head to 850 ~ 3200 m water column, the flow of 30 ~ 360 m³ / h, and more for high pressure steam boiler water supply and high pressure equipment to send liquid. It uses inside and outside the shell, the inner shell of the type and open in two sections, according to the installation position of the pump shaft is divided into two kinds of horizontal and vertical. Fourth, Y-type oil pump It is mainly used for the delivery of petroleum and its products without solid particles, the lift of 60 ~ 603m column, flow 6.25 ~ 500 m³ / h, the temperature of -45 ~ 400 ℃. Y-pump has a cantilevered, two-end support and multi-level three-stage structure type. Single-stage single-suction cantilever Y-motor drive motor, the coupling has an extended coupling in the middle, when the repair can be removed can not move the prime mover. Y-type pump in addition to horizontal, there are vertical (YT type), submerged (YC type) and pipeline (YG type) and so on. F-type corrosion-resistant centrifugal pump The pump is used to transport acid, alkali and other corrosive media centrifugal pump, requiring corrosion-resistant materials, commonly used stainless steel, high silicon cast iron, plastic, ceramics and glass. F-type pump is a single-stage single-suction cantilever corrosion-resistant centrifugal pump for conveying solid particles containing non-corrosive liquids; its head is 10 ~ 105m liquid column, the flow rate of 2 ~ 400 m³ / h, the medium temperature -20 ~ 105 ℃. The pump has a front door and rear door open two kinds of structure, the former in the maintenance of the impeller, the pump can not move, only from the front pump cover open; the latter can not move in front of the suction line, cover. According to the requirements of different applications, the F-type pump shaft seal with a soft packing seal (code-named "0"), single-end mechanical seal (codenamed "1"), double mechanical seal (codenamed "2") and other three Type. According to different media, the pump shaft sleeve and washer should be made of corrosion-resistant material to avoid corrosion of the shaft. The clearance between the mouth ring is slightly larger than that of the pump. The mechanical seal adopts a large Spring coated with tetrafluoroethylene to prevent the spring seal from invalidating the mechanical seal. Operation, the pump should be avoided when the flow rate is low or close the outlet valve to prevent the impeller agitation caused by liquid temperature, exacerbating corrosion. In addition, there is a lined pump, the parts of the pump that come in contact with the conveying liquid are lined with a corrosion-resistant material from the base material to withstand pressure and the liner is used to withstand liquid corrosion. Lined with rubber lined pumps, stainless steel lined pumps, titanium lined pumps and plastic lined pumps. Sixth, shield centrifugal pump P series shield centrifugal pump, also known as no stuffing pump, is the impeller and motor rotor with a sealed shell, there is no media leakage problem, suitable for flammable, explosive, toxic and harmful Radioactive and precious liquid transport, can also be used for high-pressure equipment, liquid circulation. The pump has the advantage of no external leakage, compact structure, small vertical pipeline pump can be installed directly on the pipeline without setting the foundation, there is no need to find the center of the coupling, the bearing without additional lubrication, operation, maintenance But the shielding sleeve is difficult to manufacture and the cost is high. Because the motor rotor rotates in the liquid to increase the frictional resistance, and the pump provides the circulating cooling liquid to the motor to make the gap of the impeller seal ring larger, the pump efficiency is low.