This section provides an overview for centrifugal pumps as well as their applications and principles. Also, please take a look at the list of 9 centrifugal pump manufacturers and their company rankings.
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A volute pump is a type of centrifugal pump equipped with a rotor in the form of an impeller inside the pump casing. The casing has a volute shape and is also called a volute pump.
Liquid enters the impeller through the suction port at the center and is propelled outward at high speed by the centrifugal action of rotation. As it passes through the volute chamber, it is gradually decelerated and converted to pressure.
There are two types of centrifugal pumps: single-stage pumps with a single impeller and multistage pumps with two or more impellers. The multistage type increases the pressure with each stage and is used when high pressure is required.
Volute pumps are often used when a high flow rate and low pressure are required. They are widely used in industrial applications such as drainage, boiler water supply, water supply and sewage, mining, and chemical industry. They are also used in agriculture, such as for irrigation and for water supply and drainage of air conditioning units.
Volute pumps are often used for relatively low-viscosity solutions with a solids volume concentration of 20% or less in the liquid. Those with improved vane shapes and materials to resist wear and corrosion are used for transporting muddy water, sewage, slurries, pulp mixtures, sand and gravel, coal, and other liquids. Furthermore, by reducing the number of blades and increasing the flow path area, they can be used to transport fish, oranges, etc., along with water.
In a volute pump, centrifugal force imparts pressure and velocity energy to a fluid by rotating an impeller in a casing. It is then decelerated in the volute-shaped casing, and the velocity energy is converted to pressure energy. This phenomenon is known as Bernoulli's theorem.
There are two types of impellers: a radial flow form with a two-dimensional curved surface in which the fluid flows in the radial direction and a mixed flow form with a three-dimensional curved surface that changes from axial to radial in an incremental manner. This is an important element for efficiently converting velocity energy into pressure.
The casing is installed so as to form a spiral-shaped chamber outside the impeller. As the cross-sectional area gradually increases in the direction of rotation, the high-speed fluid ejected from the impeller by centrifugal force is gradually decelerated, and the pressure (static pressure) increases.
There is a limit to the pressure that can be generated by a single impeller. If higher pressure is required, a multi-stage pump is used. In a multi-stage pump, the fluid leaving the first impeller is sucked into the second impeller to increase the pressure further. This can be repeated several times to obtain high pressure.
Pump construction is closely related to flow rate and head and is an important selection criterion when choosing a pump. A volute pump consists of an impeller and volute casing, shaft, bearings, drive coupling, suction and discharge couplings, shaft sealing device, and, if necessary, a pressure gauge, pressure sensor, and pressure switch.
There are pumps with non-rotating fixed guide vanes arranged around the periphery of the impeller. It is a member of the volute pump family but is also called a diffuser pump or turbine pump and is one of the centrifugal pumps. The mechanism is similar to that of a centrifugal pump, but the fluid leaving the impeller is efficiently decelerated as it passes through the guide vane, increasing the static pressure and, thus, the overall efficiency.
Since the pump structure is designed to convert liquid to pressure, problems can occur if gases are introduced into the pump or if gases are generated inside the pump. One of these problems is cavitation.
Cavitation in pumps is a phenomenon in which the pressure of a liquid drops rapidly inside the pump, and when it reaches saturation vapor pressure, the liquid vaporizes rapidly. Cavitation in a volute pump occurs when the static pressure of the fluid decreases due to the increased velocity of the liquid flowing into the impeller, and the static pressure near the inlet falls below the saturation vapor pressure of the fluid.
Repeated cavitation causes damage to the impeller, resulting in cavitation erosion. Vibration and noise are also generated, and performance is reduced. This leads to premature deterioration and destruction of equipment, not only in the centrifugal pump but also in pipes and valves.
Cavitation can be prevented by changing operating conditions, reducing resistance on the suction side, and improving the shape and area of the impeller so that the fluid pressure does not fall below the saturated vapor pressure.
*Including some distributors, etc.
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Ranking as of March 2023 in United States of AmericaDerivation Method
|1||Cahaba Media Group, Inc.||25%|
|3||CORNELL PUMP COMPANY||16.7%|
|4||John Blue Company||8.3%|
|5||Franklin Electric Co., Inc.||8.3%|
Ranking as of March 2023 GloballyDerivation Method
|1||Cahaba Media Group, Inc.||23.1%|
|3||CORNELL PUMP COMPANY||15.4%|
|5||John Blue Company||7.7%|
|6||Franklin Electric Co., Inc.||7.7%|
Derivation MethodThe ranking is calculated based on the click share within the centrifugal pump page as of March 2023. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.
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19 products are listed.
<Magnetic coupling structure prevents liquid leakage> Handling and maintenance are easy. Connections such as hoses, unions, and flanges are possible according to the application. The life of the
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