Several types of chemical pumps

　　Driven by the huge demand for oil, in the next few years, the domestic market demand for pumps and valves will continue to maintain more than 10% growth, and is a year-on-year increasing trend, then what is a chemical pump? What is the use of chemical pumps?

　　1 What is a chemical pump?

　　Pumps are used to transport liquids and increase their pressure machine chemical pumps is a general term, and chemical pumps refers to the special requirements of chemical production pumps:

　　(1) can meet the needs of chemical process

　　(2) high and low temperature resistance

　　(3) corrosion resistance

　　(4) wear-resistant

　　(5) no leakage or less leakage

　　(6) can transport the critical state of the liquid

　　(7) reliable operation, mainly refers to the characteristics of the medium, wherever possible through the material or other structural changes to improve the pump products to improve the corrosion requirements caused by all chemicals in addition to pure water, such pumps are collectively referred to as chemical pumps.

　　Chemical pump is mainly composed of pump body, impeller, pump cover and other parts.

　　2What are chemical pumps used for?

　　Widely used in industry, urban water supply, drainage, can also be used for farmland, orchard irrigation, for the transmission of water or other liquids with physical and chemical properties similar to water.

　　Scope of use of chemical pumps

　　1. Chemical pumps are suitable for extracting corrosive liquids from bottles, barrels, tanks, pools or other containers.

　　2. Chemical pumps have the advantages of stable and reliable performance, good sealing performance, beautiful modeling, easy to use and maintenance. It plays a great role in improving product quality, reducing running, risking, dripping and leaking, preventing pollution and improving environment.

　　3. Chemical pumps are suitable for chemical industry, petroleum, metallurgy, power station, food, pharmaceutical, synthetic fiber and other departments to transport corrosive media at various ℃ temperature or high physical and chemical properties of the media.

　　4. Chemical pump products mainly include: various glass fiber chemical pumps, corrosion-resistant plastic pumps, high-temperature chemical pumps, standard chemical process pumps, magnetic drive pumps and so on.

　　5. Chemical pumps are used for pumping clean water, containing abrasive, harmful substances to ordinary pump body materials, suspended, corrosive to stainless steel materials, non-explosive substances.

　　6. Chemical pumps are also widely used for water supply.

　　7. Used in heating, air-conditioning, cooling and circulating systems.

　　8. Used for civil and industrial purposes.

　　9. For fire fighting

　　10. For irrigation

　　11. For daily use and civil, industrial, horticultural and irrigation purposes.

　　12. For rainwater harvesting projects; and

　　13. For applications where low noise levels are essential.

　　14. For pressurization, suitable for conveying corrosive, explosive, granular water or liquid;; and

　　15. Suitable for pipe network pressurization.

　　3 chemical pump classification

　　According to the different materials of chemical pumps, the following classification of its application areas

　　1) Chemical pumps (stainless steel) are widely used in petroleum, chemical, metallurgy, synthetic fiber, pharmaceutical, food, synthetic fibers and other sectors for the transmission of alkaline corrosive media; 2) Chemical pumps (stainless steel) are widely used in petroleum, chemical, metallurgy, synthetic fiber, pharmaceutical, food, synthetic fiber, etc.

　　2) Chemical pumps (made of fluorine plastic) are used for conveying any acidic and alkaline corrosive media; 2) Chemical pumps (made of fluorine plastic) are used for conveying any acidic and alkaline corrosive media.

　　3) Chemical pumps (cast iron) are used for industrial and urban water supply and drainage, and can also be used for irrigation and drainage of farmland and orchards for conveying clear water or other liquids with physical and chemical properties similar to those of clear water.

　　Classification according to different uses of chemical pumps

　　1) Process pumps: including feed pumps, reflux pumps, circulation pumps, flushing pumps, sewage pumps, supplemental pumps, output pumps and so on.

　　2) Utility pumps: including boiler pumps, cool water tower pumps, fire pumps, deep well pumps for water sources.

　　3) Auxiliary pumps: including lubricating oil pumps, sealing oil pumps, hydraulic transmission pumps, etc.

　　4) Pipeline pumps: pumps for oil pipelines, pumps for loading and unloading trucks, and so on.

　　According to the working principle, structure classification

　　1) Vane pump: through the pump shaft rotation drives a variety of impeller blades to the liquid with centrifugal force or axial force, conveying liquid to the pipeline or container, such as centrifugal pumps, vortex pumps, mixed flow pumps, axial pumps.

　　2) Positive displacement pump: the use of the pump cylinder volume of continuous changes in the pump to transport liquid pumps, such as reciprocating pumps, piston pumps, gear pumps, screw pumps.

　　3) other forms of pumps: electromagnetic pumps using electromagnetic transmission of liquid conductive body state; the use of fluid energy to transport liquid pumps, such as jet pumps, air lifters.

　　Classification by conveying medium

　　1) water pumps: including fresh water pumps, boiler feed pumps, condensate pumps, hot water pumps.

　　2) Corrosion-resistant pumps: including stainless steel pumps, high-silicon cast iron pumps, ceramic acid-resistant pumps, impermeable graphite pumps, hard rubber lined pumps, hard PVC pumps, shielded pumps, diaphragm pumps, titanium pumps.

　　3) Impurity pumps: including slurry pumps, sand pumps, sewage pumps, coal dust pumps, ash pumps, etc.

　　4)Oil pumps: cold oil pumps, hot oil pumps, submersible oil pumps, oil slurry pumps, liquid hydrocarbon pumps, etc.

　　Classification according to the conditions of use

　　1)High-flow and micro-flow pumps: flow rate of 300m³/min and 0.O1L/min, respectively.

　　2) High-temperature and low-temperature pumps: high temperature up to 500 ℃, low temperature to a Z53 ℃.

　　3) High-pressure pumps and low-pressure pumps: high pressure up to 200MPa, vacuum degree of 2.66--10.66kPa (20-80mmHg);; and

　　4) High-speed and low-speed pumps: High-speed up to 24000r/min, low-speed 5-10r/min.

　　5) Accurate metering pump: flow rate metering accuracy of ± 0.3%.

　　6) high viscosity pump: viscosity up to thousands of parsecs (Pa-s).

　　4 Working principle of chemical pump

　　Negative pressure pump

　　Before starting the pump, the suction pipe and the pump must be filled with liquid. After the pump is turned on, the impeller rotates at high speed, in which the liquid rotates with the vane, and under the action of centrifugal force, it flies away from the impeller and shoots outward, and the liquid that shoots out gradually slows down in the diffusion chamber of the pump casing, and the pressure gradually increases, and then it flows out from the pump outlet and the discharge pipe. At this time, in the center of the vane as a result of the liquid is thrown to the surrounding and the formation of neither air nor liquid vacuum low-pressure area, the liquid in the pool of liquid pool under the action of atmospheric pressure, through the suction pipe into the pump, the liquid is so continuously from the pool of liquid is pumped up and continuously from the discharge pipe out.

　　Positive pressure pump

　　Mainly refers to the submerged pump [1] its working principle to gas station submersible pumps and long shaft submerged pumps as an example, submersible pumps is the motor and pump immersed in the bottom of the tank, the motor drives the impeller pressurization of the medium pushed to the ground target, the long shaft submerged pumps are pumps and motors are separated from the long shaft connection, the principle of its work is a positive pressure conveying medium, so to solve the problem of negative pressure conveying medium generated by the air resistance and the problem of impeller vapor corrosion. The motor of the submersible oil pump is not on the liquid surface, but under the liquid surface. The motor is a submerged motor, and the pump wheel is connected to the potential liquid as a whole, the main advantages of such a design are: the pump bearings are only a few hundred millimeters, there is no long shaft, there will be no oscillation problems, smooth operation, very small sound, almost no wear and tear.

　　3) Auxiliary pumps: including lubricating oil pumps, sealing oil pumps, hydraulic transmission pumps, etc.

　　5 Installation Precautions

　　So when installing chemical pumps, what matters should be noted? The following is about the installation of chemical pumps to pay attention to the installation of chemical pumps and precautions?

　　1. Make a good concrete foundation according to the size of the foundation, and bury the ground bolts at the same time.

　　2. Before installation, the pump and motor should be inspected, each part should be intact, and there should be no debris in the pump.

　　3. Put the unit on the foundation, put a pair of wedge pads between the base plate and the foundation, and adjust the wedge pads to find the level of the pump. After adjusting, tighten the foot bolt.

　　4. The suction and discharge pipelines of the pump should have brackets and cannot be supported by the pump. The caliber of inlet and outlet pipelines should be unified with the caliber of pump inlet and outlet.

　　5. FZB series self-priming pumps should be connected to the inlet pipe first when installing, and then connected to the outlet pipe after filling with liquid and correcting the steering. The inlet pipe of the pump must be matched with the pump, and the total length should not be more than 5 meters, otherwise it will affect the self-priming performance, and the self-priming height can be calculated simply according to the formula on the right: Self-priming 3m/media density=actual self-priming height in the case of clear water.

　　6. Installation is complete, the last hand to turn the coupling, check whether there is no rubbing phenomenon, turning easy and uniform is the end of the installation.

　　7. Magnetic pumps are strictly prohibited to pump with particles and easy to crystallize the medium, not allowed to close the discharge port for continuous operation, to maintain a minimum flow.

　　8. In order to prevent debris from entering the pump, there should be a filter at the inlet, the filter area should be greater than the cross-sectional area of the pipeline 3 to 4 times.

　　9. High head pumps in the export pipeline should also be installed check valves to prevent sudden shutdown of the water hammer damage.

　　10. Must ensure that the installation height of the pump in line with the pump's cavitation margin, and take into account the loss of piping and media temperature.

　　11. When the medium temperature is too high, the seal should take cooling measures to prevent deformation of the seal static ring cracking.

　　12. When the viscosity of the medium is too high, the performance and power of the pump will be changed, please contact us for details.

　　6 Starting and running of chemical pump

　　1. Before starting the pump, the pump should be filled with the liquid to be conveyed (such as the case when the pump is on suction), close the outlet gate valve, and connect the power supply.

　　2. Turn on the power supply and check whether the pump steering is correct.

　　3. Test run the unit for 5 to 10 minutes, if there is no abnormality, it can be put into operation.

　　4. When shutting down, close the gate valve at the outlet first, and then cut off the power supply.

　　7 Repair and maintenance of chemical pump

　　1. Regularly check the pump and motor, and replace the wearable parts.

　　2. When the pump is shut down for a long period of time, clean the flow channel inside the pump and cut off the power supply.

　　3. Idle running is strictly prohibited.

　　Trivia: conveying the medium is not strong corrosive, the choice of what pumps

　　Q: We need to transport the medium for 5% of dilute sulfuric acid, the temperature of 20 degrees or so, its corrosiveness is not strong, the choice of what pump?

　　A: Stainless steel (304) pumps can be used, stainless steel pumps can be transported in the following range of media:

　　If you transport the media in the above table to find available, the following for you to list several stainless steel pumps 1, CQ type stainless steel magnetic pump 2, IH type stainless steel chemical centrifugal pumps

　　If you convey the media in the above table to find not available, the following for you to list the corrosion resistance of some of the stronger material:

　　1、Engineering plastics (reinforced polypropylene)

　　2、Ultra-high molecular weight polyethylene

　　3、Fluorine plastic (PTFE, PFPE)

　　8 causes of leakage of mechanical seals for chemical pumps

　　Mechanical seal belongs to a kind of seal, generally used for rotating parts of the dynamic seal, by matching the appropriate flushing program, you can realize the media leakage or zero leakage of a small amount of leakage (sealing gas/liquid will enter the medium). Principle of mechanical seal mechanical seal (mechanical seal) refers to at least one pair of perpendicular to the axis of rotation of the end face in the fluid pressure and compensation mechanism under the action of elasticity (or magnetic force) and auxiliary seals under the cooperation to keep affixed to the relative sliding and the composition of the device to prevent the leakage of fluids.