- October 13, 2024
Imen Datis Asia Co
Mono pump, which is known by titles such as Mardoni pump, spiral pump, screw pump or progressive pump and is also known as one of the types of thickener pumps, is a type of positive displacement pump. Through the driving mechanism, this pump moves the fluid continuously and steadily with the movement of the rotor and provides a volume flow proportional to the rotation speed in two directions. At the same time, the amount of shear on the pumped liquid also remains minimal.
Imen Datis Asia Technical and Engineering Company is one of the top suppliers of fire alarm and extinguishing equipment, fire fighting and water supply pumps, pumps and industrial equipment in the country, with the aim of increasing safety, it pays from the most reliable domestic and international brands at reasonable prices.
Mono pumps have various divisions based on the type of user, which we will discuss further.
The tubular mono pump is one of the most widely used mono pump models, which has a tubular inlet. This pump is used to transfer thick fluids such as honey, paste, and fluids containing solid particles. Fluid enters this pump through a pipe that is connected to the pump by means of a flange. Due to the high concentration of the fluid and the low suction power of the pump, the fluid must be placed at a higher level than the pump inlet in order for the pumping process to take place easily. This series of pumps are used in situations where the fluid can easily fill the space between the rotor and the stator to create the highest possible pressure. This class of mono pumps are designed as helical or simple depending on the type of transfer fluid.
The mono funnel pump is similar to the tubular mono pump, with the difference that there is a funnel in its inlet section, the size of which varies according to the pump capacity. This model has a helix at its entrance that is installed on the shaft. This pump is used to move materials with solid particles and paste materials with high density and viscosity that cannot pass through the pipe. Examples of applications of this mono pump can be seen in the food industry for pumping materials such as tomatoes, apples, types of pastes, gluten, etc.
Constituent components of mono pump funnel
Foam concrete is a type of light concrete, which is also called sponge concrete due to the presence of air bubbles in its structure. This type of concrete is made from a combination of cement, sand, water and foam. In addition to having all the characteristics of ordinary concrete, foam concrete has less weight, high compressive strength, and thermal and sound insulation properties, and it is also less expensive. Using this concrete reduces the weight of the structure and the dead load of the building due to its lightness. Concrete foam mono pump is also used for moving mixed concrete. This pump is similar to the tubular model, but with the difference that it has an inspection and discharge valve on the side and also has less wear and tear.
In the concrete foam mono pump, the mixed concrete is pumped inside the stator housing by rotating the rotor. By changing the rotor and stator diameter and adjusting the motor speed, the pumping power can be increased or decreased. In addition to reducing the depreciation of the device, this method also provides the possibility of accurate and clean implementation of concrete foam.
Vertical mono pumps are designed in such a way that by entering the material into the main part of the pump inside the tank, they provide the possibility of emptying and pumping the material. The characteristics of these mono pumps include the ability to transfer materials containing solid particles, easy installation and commissioning, simple mechanism for replacing parts, easy maintenance and repair, low NPSH, and high capacity and head.
Mono barrel pumps or vertical mono pumps are usually produced with pipe lengths of 1200, 1500, and 1800 mm. The 1200 mm tube length comes with less power and no gearbox, with a rotation speed between 750 and 1000 revolutions per minute (RPM). These pumps are lightweight and portable. To move thicker fluids and tanks with greater depth, portable barrel pullers cannot be used, because the length of the pipe and higher power, and sometimes the need for a gearbox (depending on the type of transfer fluid) make it necessary to use overhead cranes to move and control the pump.
Imen Datis Asia Company, as a company approved by the firefighting organization, in addition to consulting for obtaining firefighting approval, is an importer and supplier of all types of firefighting equipment, including firefighting pumps, firefighting valves, fire alarm and extinguishing equipment, and all types of industrial equipment from the best And it is the most reliable domestic and foreign brands.
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Dosing pump or metering pump is used to accurately transfer a certain amount of fluid. These pumps are designed to be able to pump materials with different viscosities, from low to high, as well as materials containing solid particles, uniformly and with a stable output flow rate under changes in system pressure. Mono Dosing Pumps are smaller versions of Mono Pumps that are marketed. By adjusting the speed of the input driver to these pumps, the output flow rate can be controlled. Mono dosing pumps are usually produced in the flow range of 100 to 2000 liters per hour. If higher flow rates are needed, mono pumps can be used to adjust the output flow rate using inverters or variable speed gearboxes. These pumps are widely used in refineries.
Flow rate (capacity): Flow rate is determined based on liters per minute (Lit/Min), liters per hour (Lit/h) or cubic meters per hour (m³/h). These values specify the maximum volume of material to be pumped.
Head (pressure): Head is expressed in meters (m) or bar (bar) and shows the pressure required to transport the pumped material in a certain distance.
Viscosity: Viscosity is measured in centipoise (cps) or centistock (cst) and depends on the physical characteristics of the pumped material. The power and speed of the mono pump is determined based on the viscosity of the material.
Other physical characteristics, such as wear and corrosion, should influence the selection of rotor and stator, if applicable. For example, if the material contains coarse particles, the stator is reinforced with a resistant liner layer.
Chemical characteristics: Factors such as the pH level of the material and its chemical behavior, especially in cases of corrosion, are considered essential factors in the selection of the pump and must be determined.
Working temperature: When the temperature of the pumped material must be kept constant or is very high, the pump is custom designed and manufactured.
Speed: In some special material conditions, it is not possible to use high speed for pumping. In this case, the distance limit should be specified and the appropriate driving unit should be selected.
Limitation of space for installation and placement of the pump: this factor should also be considered in choosing the pump.
In general, mono pumps are used for measuring and metering, pumping water, and transferring all kinds of liquids and fluids that have high adhesion and viscosity. These pumps are very effective for moving and pumping viscous liquids. Also, when there is a need for continuous operation, with high pressure and without turbulence, the mono pump is considered an ideal choice.
The application of these pumps is very wide in various industries, including chemical, sanitary, detergent, food and beverage, mining, cement and oil industries. Some of the most important applications of this pump include the following:
Mono pumps are used to pump and transfer fluids with different viscosities, from thick and viscous to thin. These pumps are capable of moving multiphase materials as well. With a low NPSH, they produce a uniform and continuous flow that has very little shearing effects. The flow rate of the pumps is proportional to the engine speed and provides high suction power.
Maintenance and maintenance of these pumps is easy and they are very suitable for transferring materials that contain solid particles. These pumps have a long lifespan and have a low possibility of depreciation. Their resistance to wear is high and they make little noise during operation. Also, they do not need to use expensive seals. Mono pumps offer high capacity and pressure and are considered a suitable option for the dosing process.
One of the advantages of mono pumps over other pumps is the use of more advanced technologies in their production. These pumps with a more efficient structure and better performance, compared to other types of pumps, offer many advantages and have wider applications.
Electric motor
To generate propulsion force in the fluid, an electric motor is used, which provides the required flow rate and pressure according to the density and viscosity of the fluid. In mono pumps, increasing the engine speed also leads to an increase in the output flow rate. Also, the output pressure depends on the input power of the electric motor; So that with the increase in power, the output pressure also increases. Stages are also known as important factors in determining the pressure in mono pumps, so there is a direct relationship between the stage and the power of the electric motor to create pressure.
gearbox
The gearbox is used to adjust the engine speed to the desired level and control the pump capacity. For this purpose, they use high-frequency gearboxes (inverter), variable speed gearboxes, and in some cases, belts and pulleys. The relationship of the gearbox with the viscosity of the transmission fluid is direct; It is used for thin fluids from the top and for thick fluids from the bottom. Also, variable speed gearboxes can be used to control the flow rate. Another way to reduce revs in a mono pump is to use a pulley and belt, which is more cost-effective than a gearbox.
Mono pump rotor
The rotor is a rotating and spiral part with large pitches, which has deep ribs and a narrow center. The pitch of the rotor is half of the pitch of the stator, and its empty spaces are filled with fluid in each revolution, which causes fluid transfer. The material of the rotor is different depending on the type of fluid that is transferred; When the fluid contains silica or is abrasive, the rotor is protected by a polymer coating and is usually made of cast iron, wear-resistant steel, and stainless steel. The smooth and polished surface of the rotor increases the life of the part and makes the pump work smoother. To prevent rotting and peeling of the rotor cover, instead of standard chrome covers, the ductile electrolyte method can be used. Pump pressure depends on the number of rotor steps; Usually, both steps include a stage that produces about 8 bar pressure. The rotor is usually designed and manufactured as one-way and two-way, and with the increase of rotor diameter, step length and step depth, the output flow rate of the pump increases and the working pressure decreases.
Mono pump stator
The stator refers to the inner part of the body that houses the rotor in a spiral. Stators consist of two parts: the stator housing and the outer part, which is usually made of steel, cast iron, bronze, chrome, nickel, molybdenum and special alloys. The inner part of the stator is made of elastomers such as natural, synthetic, PTFE and polypropylene, which are selected according to the type of pumped fluid and resistance to wear, heat, oil, acid and solvents.
Rubber stator mono pump
Mono pumps usually have a rubber stator. One of the important points in choosing a mono pump is the compatibility of the stator with the transmission fluid; For example, PTFE stator is used to transfer fluids of food and pharmaceutical industries. Damage to the stator due to dry operation may be caused by the lack of lubrication of the pumped fluid, which increases the friction between the rotor and the stator and increases the temperature.
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Mono pump also has disadvantages as follows:
– Relatively high price of mono pump
– Lower output pressure
– Complexity in repair and installation
– In conditions of very high temperatures or dry environments, its pumping efficiency decreases significantly.
Every device has a specific working capacity and mono pump is no exception to this rule. Each mono pump model has a specific capacity according to its characteristics. If this capacity is exceeded, the device will gradually get hot and damaged and may fail.
The determining factors of capacity are:
– Rotor diameter
– Rotor crank depth
– Rotor pitch length
– Rotor pitch
Among the four factors that were mentioned, the first three factors are fixed and defined for each mono pump model based on the manufacturer’s standards. Only the fourth factor, the pitch of the rotor, is determined by the decision of the manufacturer, but you can change it. Before choosing a mono pump, it is recommended to know its capacity so that you can choose the right option for your needs.
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