What is chemical pump? and details of chemical pumps

Chemical pumps are widely used in chemical industry, petrochemical industry, metallurgy, pharmacy, food, water treatment and other fields. Its main features include corrosion resistance, wear resistance, no leakage, the ability to convey liquids in critical condition, and reliable operation. In order to meet the needs of chemical process, chemical pumps usually have the following characteristics: high and low temperature resistance, corrosion resistance, wear resistance, no leakage, and the ability to transport the critical state of the liquid. Operational reliability is the most important characteristic of chemical pumps, and this can be achieved by changing materials or construction to increase the pump’s resistance to corrosion for all chemicals except pure water.

Chemical pumps are designed to meet international standard ISO2858 with a full range of hydraulic performance layouts and a wide range of user options. Its structure is easy to overhaul, and its efficiency and suction range reach the international advanced level. Chemical pump is mainly composed of pump body, impeller, pump cover and other parts, using electric motor or diesel engine to drive the impeller to rotate in the pump casing, generating pressure and realizing the transportation of liquid.
I. Structure and working principle of chemical pump
Chemical pump, also called corrosive medium pump, is a kind of pump designed for chemical industry, mainly used for conveying various chemical liquids and corrosive media. It is composed of electric motor, coupling, pump body, mechanical seal, bearing and so on. Its main working principle is to transfer the power of the motor to the pump body, through the rotation of the rotor will be pumped from the suction port to the pressure port, to realize the process of conveying.
Second, the common types of chemical pumps

 

1. 1. According to the different materials of chemical pumps, their application areas are categorized as follows:
      (1) chemical pump (stainless steel) is widely used in petroleum, chemical, metallurgy, synthetic fiber, pharmaceutical, food, synthetic fibers and other departments for conveying 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) for industrial, urban water supply, drainage, can also be used for farmland, orchard irrigation and drainage, for the transmission of water or other liquids with physical and chemical properties similar to water.
      Second, according to the different uses of chemical pumps, its classification is described in detail:
      (1) Process pumps: including feed pumps, reflux pumps, circulating 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 use pumps: including lubricating oil pumps, sealing oil pumps, hydraulic transmission pumps, etc.
      (4) pipeline pumps: oil pipeline pumps, loading and unloading pumps and so on.
      Third, according to the working principle, structure classification:
      (1) vane pump: through the pump shaft rotation drives a variety of impeller blades to the liquid to 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 pumps: 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 uplifter, etc..
      Fourth, according to the transportation medium classification:
      (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 pumps, impermeable graphite pumps, lined with hard rubber 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, submerged oil pumps, oil slurry pumps, liquid hydrocarbon pumps, etc..
      V. 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 pumps 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);
      (4) High-speed pumps and low-speed pumps: high speed up to 24,000r / min, low-speed 5-10r / min;
      (5) Accurate metering pump: flow measurement accuracy of ± 0.3%;
      (6) high viscosity pumps: viscosity up to thousands of parsecs (Pa-s)
      Several types of chemical pumps are briefly introduced:

1. 1. centrifugal pump:
      Centrifugal pump is the most common type of chemical pump, widely used in various fields. It is suitable for conveying clean liquids of low viscosity, such as water, oil, etc. It is capable of generating pressure similar to centrifugal force to send the medium out of the place of use.

1. 1. magnetic pump:
      Magnetic pump is a kind of non-contact pump, which only needs to be connected to the power supply when using. The main body of the pump and the motor part are connected magnetically without mechanical sealing, so the magnetic pump has a long service life and is not easy to be damaged.

1. 1. Diaphragm pump:
      Diaphragm pump is a kind of pump powered by compressed air, with diaphragm set inside the pump body, through the compressed air drive energy inside the pump body, the medium is sucked into the pump body from the suction port, and then sent out of the pump body through the compressed air, to realize the process of conveying.

1. 1. vacuum pump:
      Vacuum pump is a kind of pump used to extract air and reduce the pressure inside the container to a certain low degree. It is usually used in the chemical industry where a high degree of vacuum environment is required for specific reactions.
      C. Precautions for use

1. 1. Before using the chemical pump, you need to check the pump first to make sure that each part is in normal working condition. 2.

1. 1. in the process of using chemical pump, you need to pay close attention to the pump pressure, temperature, speed and so on, if abnormalities need to be dealt with in time.

1. 1. in order to ensure the normal service life of the chemical pump, it is necessary to carry out maintenance on a regular basis, check the lubricating oil, bearings and other parts of the situation, and timely replacement of damaged components.

1. 1. chemical pump in the working process may often come into contact with corrosive media, so you need to use corrosion-resistant materials to make pump parts to ensure its long-term stable working condition.

1. 1. When using chemical pumps, you need to select the appropriate type of chemical pump according to the specific material transportation situation to ensure that it can be properly transported. At the same time, attention needs to be paid to the selection of appropriate pump specifications and quantity.