How about a single stage centrifugal pump, what is an upright single stage centrifugal pump?

Steps for single-stage centrifugal pump selection:

1. Characteristics of the medium: medium name, specific gravity, viscosity, corrosiveness, toxicity, etc.

2. The diameter and content of the solid particles contained in the medium.

3. Medium temperature: (

4. The required flow rate The leakage in the pipeline system can be ignored in the process of general industrial pumps, but the impact on the flow rate must be considered when the process changes. If the agricultural pump is used to transport water through open channels, leakage and evaporation must also be considered.

5. Pressure: suction pool pressure, drainage pool pressure, pressure drop (head loss) in the pipeline system.

6. Pipeline system data (pipe diameter, length, type and number of pipeline accessories, geometric elevation from suction tank to pressurized water tank, etc.).

First of all, it is necessary to be clear about the purpose of the centrifugal pump, and put forward specific and detailed requirements as needed.

For example, specific requirements such as flow, head, speed, efficiency, etc.

Then it is to choose a reasonable installation method according to the site, such as vertical or horizontal centrifugal pump, in addition to the performance parameters of the centrifugal pump, there are also pumps that meet the requirements of reliable operation and low maintenance and repair costs. (Xi'an South is reliable).

The commonly used pump is piston type or plunger type, which is driven by the power machine to rotate the crankshaft of the pump, and the crankshaft is driven by the crosshead and then driven by the piston or plunger to do reciprocating motion in the pump cylinder. Under the alternating action of suction and discharge valves, the purpose of pressure delivery and circulation flushing liquid is realized.

The vertical single-stage centrifugal pump is also a vertical pump, including the pump body, the pump cover, the motor with the output shaft, the pump shaft, bearing seat, impeller, mechanical hidden seal and machine sealing gland installed in the pump body, which is connected with the motor through the extended elastic coupling and liquid hall, and the rotation direction of the pump, from the drive end, rotates in a clockwise direction. It is characterized in that it also comprises a clamp-type coupling that is arranged between the output shaft of the motor and the pump shaft, and a guide bearing mounted on the bearing seat to assist in supporting the pump shaft; Described clamp coupling is rigidly connected with motor output shaft and pump shaft respectively, and space distance that is convenient for mechanical seal and machine seal gland assembly is left between motor output shaft and pump shaft. There is no need to dismantle the motor and pump cover when repairing or replacing mechanical seals.

Precautions for use: In order to avoid shaft wear, a shaft sleeve is installed to protect the shaft through the packing cavity. There is an O-ring between the sleeve and the shaft to prevent air ingress or water leakage along the mating surface.

Transmission mode: The transmission mode of the pump is connected with the motor by extending the elastic coupling of the burier, and the rotation direction of the pump, from the drive end, is clockwise rotation.

Uses: Mainly suitable for industry, agriculture and urban, drainage, fire and water supply, etc.

The so-called single-stage burial and previous multi-stage both refer to the number of impellers. The single-stage is the structure of an impeller. Usually it is mostly a horizontal cantilever single-stage pump, OH1 type.

Of course, the BB2 pump also has a single-stage structure. A multistage centrifugal pump is a pump with multiple impellers connected in series on the shaft, and the API code is from BB2, BB3, BB4, BB5, etc. The vertical multistage pump is VS6 structure.

These are the types of structures that can be found in the standard.

The multi-stage centrifugal pump is rotated by impellers of more than 2 stages installed on the same shaft, and the output of the first stage impeller enters the input of the second stage impeller. The flow rate is not greater than that of a single-stage pump, but the pressure is the superposition of the impellers of each stage.

High pressure and low flow are the characteristics of multistage pumps. Single-stage centrifugal pumps have only one stage impeller with low pressure and high flow rate.

The single-stage centrifugal pump is composed of: impeller, pump body, pump cover, pump shaft, bearing body, bearing, seal, etc.

The working principle is: the impeller is driven by the shaft to rotate at high speed, and the liquid between the blades must also rotate. Under the action of centrifugal force, the liquid is thrown from the center of the impeller to the outer edge and obtains energy, leaving the outer edge of the impeller at high speed and entering the snail pump Senhui clear shell.

In the volute, the liquid is decelerated due to the gradual expansion of the flow channel, and part of the kinetic energy is converted into static pressure energy, and finally flows into the discharge pipe at a higher pressure and is sent to the place where it is needed. When the liquid flows from the center of the impeller to the outer edge, a certain vacuum is formed in the center of the impeller, and because the pressure above the liquid level of the tank is greater than the pressure at the inlet of the pump, the liquid is continuously pressed into the impeller. As long as the impeller is constantly turning, the liquid will be continuously sucked in and discharged.

The specific revolution is the number of similar features derived from the law of hydraulic similarity to distinguish the hydraulic characteristics of centrifugal pumps. In centrifugal pumps, the specific number of revolutions is often understood as: the pump operates at the highest efficiency, the head is lm, and the flow rate is ?

The power consumed by s is 0The number of revolutions required at 735kw. It has the following meanings:

1. Geometrically similar centrifugal pumps have similar working conditions at the highest efficiency points in various places; 2. The geometry of centrifugal pumps with different specific revolutions must be different; The geometry of a pump with the same number of revolutions must be similar, but it is not excluded that the geometry is not similar. The following factors are related to the specific revolutions. The specific rotation of the centrifugal pump has nothing to do with the nature of the liquid to be conveyed, but is closely related to the shape of the impeller and the shape of the performance curve of the pump.

The pump with a high specific speed corresponds to a large flow rate and a small head when the efficiency is the highest; The opposite is true for pumps with low specific revolutions, which are suitable for smaller flows and higher heads. When the outlet pipe diameter of the pump is the same, if the flow rate of the two pumps is similar, the head with a smaller number of revolutions is smaller, and the shaft power consumption is also larger. Generally speaking, centrifugal pumps with a smaller specific number of revolutions have a narrow impeller outlet width and a large outer diameter, and the flow channel formed by the blades is narrow and long.

If the specific speed is relatively large, the impeller outlet is wide, and the outer diameter is small, the flow channel is short and wide.

Hope mine is helpful to you, hope!

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1. Make the type and performance of the selected single-stage centrifugal pump meet the requirements of process parameters such as flow, head, pressure, temperature, cavitation flow, suction stroke, etc.

2. It must meet the requirements of medium characteristics. For pumps transporting flammable, explosive, toxic or valuable media, reliable shaft seals or leakage-free pumps are required, such as magnetic drive pumps, diaphragm pumps, and shielded pumps; Centrifugal pumps transporting corrosive media require corrosion-resistant materials for convection parts.

3. High reliability, low noise and low vibration in mechanical aspects.

4. Economically, the total cost of equipment cost, operation cost, maintenance cost and management fee should be taken into account as the lowest.

Centrifugal pump: the use of impeller to stir up the fluid, the use of the rotation of the fluid to produce centrifugal force transport, mainly different from the piston pump, piston pump, also known as vacuum pump, is to change the volume of the liquid to accommodate the cavity to produce pressure to transport fluid, and centrifugal pump is mainly to use the speed of the fluid to rotate up to produce enough centrifugal force, so that the fluid produces pressure to transport the fluid, so the general centrifugal pump suction stroke is very small or no suction lift at all, and the vacuum pump suction stroke is relatively large.

Multistage pump: As the name suggests, it is a liquid transfer equipment with multi-stage pressurization, and the working principle of the multistage pump is that each stage is based on the liquid that has been pressurized in the previous stage and then pressurized, which can produce a higher delivery pressure.

The centrifugal pump is to throw out or transfer the medium to the outlet pipeline through the centrifugal force of the high-speed rotation of the rotor part of the pump, the rotor of the centrifugal pump is mainly composed of two major components, one is the impeller, the other is the pump shaft, the pump shaft is connected by the coupling and the motor, providing power, because it is through the principle of centrifugal force to input the medium, so it is called a centrifugal pump. The impeller is the component of the centrifugal pump used to throw water, and the industry uses "grade" to indicate the number of impellers. According to the structure and working principle of multistage pumps, there are mainly self-balancing multistage pumps, ordinary horizontal multistage pumps, multistage split pumps, vertical multistage pumps, and several multistage centrifugal pumps on the market.