What are the classifications of chemical pumps?

　　There are many types of pumps with different structures, and there are many ways to categorize them, and the common ways to categorize chemical pumps are:

　　First, the classification of chemical pump conveying medium:

　　1, chemical oil pumps: hot oil pumps, liquid hydrogen pumps, cold oil pumps, oil slurry pumps and other products.

　　2、Chemical water pumps: including common common hot water pumps, boiler feed pumps, fresh water pumps, condensate pumps and so on.

　　3、Chemical impurity water pumps: including mortar pumps, sewage pumps, slurry pumps and slurry pumps.

　　4, chemical corrosion-resistant pumps: stainless steel pumps, high-pressure cast iron pumps, diaphragm pumps, titanium pumps and impermeable graphite pumps.

　　Second, the classification of the use of chemical pumps:

　　1、Pipeline pumps: oil pipeline pumps, loading and unloading truck pumps and so on.

　　2、Utility pumps: cooling tower pumps, water source deep well pumps and boiler pumps.

　　3, auxiliary pumps: lubricating oil pumps, sealing oil pumps and hydraulic pumps.

　　4, process pumps: reflux pumps, flushing pumps, feed pumps, replenishment pumps, output pumps and so on.

　　Third, according to the working principle of the pump classification

　　1) vane pump: vane pump is the pump impeller high-speed rotation of mechanical energy into the liquid kinetic energy and pressure energy. As the impeller has a curved and twisted blade, so called vane pump. According to the impeller structure of the liquid force, the vane pump can be divided into:

　　① centrifugal pump: centrifugal force formed by the rotation of the impeller inertia and pumping liquid pump.

　　② axial flow pump: by the rotation of the impeller axial thrust and pumping liquid pump. Belongs to the low head, large flow pump type, general performance range: head 1-12m; flow rate of 0.3-65m3 / s, than the number of revolutions 500-1600.

　　③ Mixed-flow pump: impeller rotation produces both inertial centrifugal force and axial thrust and pumping liquid pump.

　　2) Positive displacement pump: the use of studio volume periodic changes to transport liquid. There are piston pumps, piston pumps, diaphragm pumps, gear pumps, screw pumps and so on.

　　3) Other types of pumps: jet pumps, water hammer pumps, electromagnetic pumps.

　　(2) centrifugal pump classification

　　Centrifugal pumps are categorized by structural form:

　　① Classified according to the orientation of the main shaft:

　　a. Horizontal pump: the main shaft is placed horizontally.

　　b. Inclined pump: the main shaft is placed at an angle to the horizontal plane; c. Vertical pump: the main shaft is placed at an angle to the horizontal plane.

　　c. Vertical pumps: spindle placed perpendicular to the horizontal plane.

　　② according to the impeller suction mode classification:

　　a. Single suction pump: liquid flows into the impeller from one side, single suction impeller; b. Double suction pump: liquid flows into the impeller from one side, single suction impeller.

　　b. Double suction pump: liquid flows into the impeller from both sides, double suction impeller.

　　③ Classification according to the number of impeller stages:

　　a. Single-stage pump: the pump shaft is equipped with only one impeller; b. Multi-stage pump: the liquid flows into the impeller from both sides, double suction impeller.

　　b. Multi-stage pumps: two or more impellers are installed on the same pump shaft, and the liquid flows through each impeller in turn.

　　④ Classify the pump casing according to the way of splitting:

　　a. Segmental pumps: the casing is divided by the plane perpendicular to the main shaft; b. Segmental pumps: the casing is divided by the plane perpendicular to the main shaft.

　　b. Segmented pump: in segmented multi-stage pumps, each section of the pump body is separated; c. Center-open pump: the pump body is separated by the plane perpendicular to the main shaft.

　　c. Split case pump: shell from the pump axis axis through the plane of separation, according to the orientation of the plane of dissection is divided into: horizontal split case pump: split surface is horizontal, for the horizontal pump; vertical split case pump: split surface and the horizontal vertical, for the vertical pump; slant open case pump: split surface and the horizontal surface at an angle, for the oblique pump.

　　⑤ Classified according to the form of pump body:

　　a. Worm casing pump.

　　b.Double worm case pump.

　　⑥ special structural form of the pump:

　　a. Submersible electric pumps: pumps and motors made into one, can be submerged in the water work, the pump body is generally a single-stage or multi-stage vertical centrifugal pumps and axial flow pumps.

　　b. Submerged pumps: single-stage or multi-stage vertical centrifugal pumps, the motor, pump seat is located in the upper part of the liquid surface, the pump body is submerged in the liquid, and the motor drives the impeller to rotate through a long drive shaft. Mainly used in food and other industries.

　　c. Pipeline pumps: installed directly in the horizontal pipeline or vertical pipeline operation, the pump inlet and outlet in a straight line, and in most cases the inlet and outlet of the same caliber, suitable for industrial systems in the middle of the pressurized, air conditioning circulating water transfer and urban high-rise building water supply.

　　d. Shielded pump: motor and pump into one, the motor and pump co-axial form, the motor inside and outside the rotor using shielding between the rotor isolation, the pump in addition to the import and export, in the structure of the complete closure, to ensure that the pump conveying the liquid when the absolute non-leakage.

　　e. Magnetic pump: the power of the motor is transmitted to the pump through the magnetic coupling, in which the inner rotor magnet of the magnetic coupling drives the impeller, and an isolation sleeve is used between the inner and outer rotor magnets of the magnetic coupling, which is also a non-sealing and non-leakage type of pump like the shielded pump.

　　f. Self-priming pump: the first time to the pump into a small amount of liquid, after starting the pump can be self-water pump, mostly horizontal centrifugal pumps, vortex pumps, etc.. Sprinkler irrigation in the application of more.

　　g. High-speed pumps: from the working principle of the pump to be divided into high-speed part of the flow tangential pumps and high-speed centrifugal pumps in two structural forms. From the speed mode points through the motor frequency direct-drive high-speed pumps and high-speed pump speed box. Motor frequency direct-drive speed below 900r/min, by the gearbox to make the pump spindle speed increase, the speed can be higher, but the highest speed is not more than 24000r/min.

　　h. Direct-connected pumps: the pump utilizes the shaft of the power machine as the main shaft, eliminating the pump suspension part.

　　i.Deep well pump: a multi-stage vertical centrifugal pump, used to take groundwater equipment, motor, pump seat is located in the upper part of the wellhead, the pump body is submerged in the water under the well, the motor through the long drive shaft concentric with the water pipeline to drive the impeller rotation. For the use of groundwater as a source of water for urban and agricultural irrigation.

　　j. Water wheel pump: by the turbine and pump according to certain ways of water lifting machinery. With the head of water turbine rotation, as a power, drive the pump impeller rotation, so as to achieve the purpose of water lifting.

　　(3)Classification of axial flow pumps

　　1) Classified according to the way of pump shaft placement:

　　① vertical axial pump: the main shaft is placed vertically in the horizontal plane; ② horizontal axial pump: the main shaft is placed vertically in the horizontal plane.

　　② Horizontal axial pump: the main shaft is placed horizontally; ③ Inclined axial pump: the main shaft is placed vertically in the horizontal plane.

　　③ Inclined axial flow pump: the main shaft is placed at an angle to the horizontal plane.

　　2) According to the impeller in the hub body on the fixed way classification

　　① fixed vane axial pump: vane angle fixed non-adjustable, mostly used for small axial pumps; ② semi-adjustable vane axial pump

　　② half-adjustable vane axial pump: downtime can be removed to adjust the vane angle of the impeller; ③ fully adjustable vane axial pump

　　(4) mixed flow pump classification

　　Mixed flow pumps have two types of mixed flow pumps and guide vane mixed flow pumps.

　　1) Worm casing mixed flow pump: shape and structure of the single-stage single-suction centrifugal pump similar to the way.

　　2) guide vane mixed flow pump: shape and structure and axial flow pump similar.

　　(5) volumetric pump classification

　　Volumetric pumps can be divided into reciprocating pumps and rotary pumps according to the reciprocating or rotary movement of the working elements.

　　Through the piston, plunger work element for reciprocating motion of the volumetric pump is called reciprocating pump. Through the gear, screw, impeller rotor or slide and other working elements of the rotation to produce volume changes in the working chamber so that the liquid is constantly transferred from the suction side to the discharge side of the pump is called rotary pump. Such as gear pumps, screw pumps, liquid ring pumps, flexible impeller pumps, rotary piston pumps, radial or axial rotary piston pumps.