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Various chemical pumps introduced
1. With the development of the chemical pump metering industry, the accuracy of the delivery of quantitative liquid requirements are getting higher and higher, and sometimes also need accurate ingredients than. In order to complete the task of transporting such liquids, often use metering pump or proportional pump. The metering pump is a reciprocating type. The basic construction is the same as the reciprocating pump, except that it has a set of mechanisms that regulate the flow accurately. Metering pump is the eccentric rotation of the motor into piston reciprocating motion. Adjusting the eccentric eccentric distance, can change the piston stroke to change the flow. 2. Rotary pump Rotary pump is based on the rotation of the pump rotor body inhalation and discharge of liquid. A rotary pump, also known as a rotor pump, also belongs to a positive displacement pump. The most common rotary pumps in petroleum and chemical plants are gear pumps and screw pumps, which are described below. (1) gear pump gear pump (gear pump) is mainly composed of an oval-shaped pump casing and two gears. One of the gears is a driving gear driven by the transmission mechanism and the other is a driven gear engaged with the driving gear and subsequently rotated in the opposite direction. When the gear rotates, the teeth of the two gears are separated from each other to form a low pressure to suck the liquid and push it along the wall of the housing to the discharge chamber. In the discharge chamber, the two gear teeth close together to form a high pressure liquid discharge. So continuous to complete the task of liquid delivery. Gear pump flow is small, resulting in a high pressure head, suitable for conveying viscous liquids, such as glycerol. (2) screw pump Screw pump (screw pump) is mainly composed of a pump housing and one or more screws. The working principle of the single screw pump is to rotate the screw pump in the pump housing with the inner screw to propel the liquid in the axial direction and finally to be discharged to the discharge port. Twin screw pump gear pump is very similar, it uses two intermeshing screw to drain the liquid. When the pressure is high, multi-screw pumps can be used. Screw speed of 3000r / min or less, the maximum outlet pressure up to 1.72 × 107Pa. Flow range of 1.5 ~ 500m3 / h. If the single screw pump shell liner hard rubber, but also for the conveyor belt particles suspension. Screw pump efficiency than the gear pump. No noise during operation, no vibration, uniform flow. Viscous liquids can be delivered under high pressure. 3. Vortex pump Vortex pump is a special type of centrifugal pump. The pump housing is perfectly circular with the suction and discharge outlets on the top of the pump housing. As for the internal structure of the pump and centrifugal pump is not the same. Impeller 1 is a disc, milling around the groove, into a radial arrangement, constitute the blade 2. There is a certain gap between the impeller and the pump casing 3 to form a flow passage 4. There is a partition 5 between the suction pipe connector and the discharge pipe connector. After the pump is filled with liquid, when the impeller rotates, due to the centrifugal force, the liquid in the vane groove will be thrown to the flow channel at a certain speed. In the flow channel with wide cross-sectional area, the liquid flow velocity slows down and some kinetic energy becomes static Pressure energy. At the same time, the inner side of the vane groove is thrown out by the liquid to form a low pressure, so the liquid with higher pressure in the flow channel can be re-entered into the vane groove to resume the pressure again by the centrifugal force, so that the liquid is inhaled through the suction port, Repeatedly through the vane groove and repeated vortex flow between the runner, and reach the exit, you can get a higher pressure head. The vortex pump should be irrigated before it starts. When the flow rate decreases, the vortex pump increases the pressure head and increases the power. Therefore, the vortex pump should not close the outlet valve before starting, and adjust the flow by bypass. Vortex pump flow is small, high pressure head, small size, simple structure. It is widely used in chemical production, suitable for small flow, high head pressure and viscosity of the liquid. The efficiency of the vortex pump is generally not more than 40%.