Which single stage centrifugal pump is better, and how is it exactly?

1. It is used for conveying liquids that do not contain solid particles, are corrosive, and have viscosity similar to water.

2. For the transportation of gasoline, kerosene, diesel and other petroleum products, the temperature of the conveyed medium is -20 120.

3. It is widely used in: energy, metallurgy, chemical industry, textile, papermaking, and high-temperature hot water pressurized circulation transportation and urban heating system of boilers such as hotels and restaurants.

4. It is used for transporting clean water and other liquids with physical and chemical properties similar to clean water, and is suitable for industrial and urban water supply and drainage, pressurized water supply for high-rise buildings, garden sprinkler irrigation, fire pressurization, long-distance transportation, HVAC and refrigeration cycle.

Whether a type of product is good or not mainly depends on its use. If the product is widely used, and can ensure that its use effect can meet the needs of production to the greatest extent, I believe that this kind of product is more successful. For the single-stage centrifugal pump, although its use still has certain limitations, but in the hard work of many experts and scholars, it has been greatly improved, and I believe that in the future, the single-stage centrifugal pump will have a broader day.

It is a famous trademark of Shanghai Sunshine brand in the domestic pump industry, which can be used with confidence.

Structural features of a single-stage centrifugal pump.

The single-stage centrifugal pump is characterized by the fact that it also includes a clamp-type coupling located 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.

Characteristics of single-stage centrifugal pump: 1. High efficiency and energy saving: CFD computational fluid dynamics is used to analyze and calculate the relationship between pressure distribution and speed distribution in the pump, optimize the flow channel design of the pump, ensure that the pump has an efficient hydraulic line, and improve the efficiency of the pump.

2. Easy installation and maintenance: Vertical pipeline structure, the inlet and outlet of the pump can be installed in any position and any direction of the pipeline like a valve, and the installation and maintenance are extremely convenient.

Hello,Single-stage centrifugal pump manufacturer imported from the United States - Kornke KNKEGlad for your question.

1) High efficiency and energy saving: CFD computational fluid dynamics is used to analyze and calculate the relationship between pressure distribution and speed distribution in the pump, optimize the flow channel design of the pump, ensure that the pump has an efficient hydraulic line, and improve the efficiency of the pump.

Knke imported centrifugal pump.

2) Easy installation and maintenance: Vertical pipeline structure, the inlet and outlet of the pump can be installed in any position and any direction of the pipeline like a valve, and the installation and maintenance are extremely convenient.

3) Stable operation, safe and reliable: the motor shaft and the pump shaft are coaxial direct connection, high concentricity, stable operation, safe and reliable.

The above is the single-stage centrifugal pump manufacturer imported from the United States - Keen Ke KNKE, about this problem. If you have the purchase needs of single-stage centrifugal pumps, please go to the official website of KNKE for selection and procurement, or ask KNKE professional and technical personnel to find the most suitable products for you.

You must read the manual before use, you can't make a mistake, you don't use it for a long time, you must turn the impeller before use, otherwise you will burn the bag because you don't use it for a long time. The suction tube and pump must be filled with liquid before the pump is turned on.

After the pump is opened, the impeller rotates at high speed, and the liquid in it rotates with the blades, and under the action of centrifugal force, it flies away from the impeller and shoots outward, and the injected liquid gradually slows down in the pump casing diffusion chamber, and the pressure gradually increases, and then flows out from the pump outlet and discharge pipe.

At this time, at the center of the blade, because the liquid is thrown around, a vacuum low pressure area with neither air nor liquid is formed, and the liquid in the liquid pool flows into the pump through the suction pipe under the action of the atmospheric pressure on the pool surface, and the liquid is continuously sucked up from the liquid pool and continuously flows out of the discharge pipe.

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!

Can solve + original + five-star) Thank you!

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.

Hello,Centrifugal pump manufacturer imported from the United States - Kornko KNKEGlad for your question.

The structure is simple and compact, for the same conveying volume, the centrifugal pump occupies a small area, light weight, less material consumption, and the foundation requirements are not as high as the compound pump, so the manufacturing and installation costs are less.

Kornko KNKE centrifugal pumps.

It can run at high speed, can take 2-pole or 4-pole motor direct connection, and the transmission structure is simple and easy to install.

The centrifugal pump has no valve and is therefore suitable for conveying suspensions, and the special design also allows for the transfer of suspensions of large solids.

Pumps can be manufactured from chemically resistant materials and are suitable for conveying corrosive solutions.

Because of simple structure, few parts, few failures, durable, less maintenance costs, convenient management, and reliable work.

The output can be adjusted arbitrarily by the discharge valve or even fully closed, and there will be no danger of unlimited rise of the pressure head.

Centrifugal pumps are most suitable for large amounts of liquid to be conveyed and the pressure head is not required.

The liquid is discharged evenly and there is no pulse.

That's itCentrifugal pump manufacturer imported from the United States - Kornko KNKE, on the subject. If you have the purchase needs of centrifugal pumps, welcome to the official website of KNKE in the United States for selection and procurement, or ask the professional and technical personnel of KNKE to find the most suitable product for you.

There are three major differences between a multistage pump and a single-stage pump.

I have seen that some multistage pumps and single-stage pumps can reach the same pressure, but when choosing, multistage pumps are still used, and on what basis do you choose to use multistage or single-stage? Or for some other reason? What is the difference between a single stage and a multi-stage?

Is it just the difference in the number of impellers?

1. Single-stage pump refers to a pump with only one impeller and a maximum head of only 125 meters;

2. Multistage pump refers to a pump with two or more impellers, which can absorb and press water in multiple stages in stages, so as to lift the water to a very high position, and the head can increase or decrease the number of stages of the pump impeller according to the need; In the case that the single-stage pump head needs to be equipped with a two-stage motor, the multi-stage pump can be equipped with a four-stage motor by increasing the number of impellers, so as to improve the service life of the pump and reduce the noise of the unit;

3. When the actual lift of the pump is less than 125 meters, the single-stage pump or multi-stage pump can be comprehensively considered according to the area of the pump room, the pump (the multi-stage pump is generally higher than the single-stage pump), and other factors.

I think the use of multi-stage is mainly due to economic considerations, which can be described in any fluid mechanics book. Single-stage and multi-stage is the difference between compression stage, a compression stage not only refers to the impeller but also the static vane holding ring, interstage sealing and so on.

According to the head level, choose a single-stage pump or a multi-stage pump, the efficiency of the multi-stage pump is lower than that of the single-stage pump, such as the single-stage pump and the multi-stage pump can also be used, the first choice of single-stage pump. If the single-stage pump can meet the needs, try to use the single-stage pump, the multi-stage pump structure is complex, there are many spare parts, the installation requirements are high, and the maintenance is very troublesome.

The multistage pump is the sum of the single-stage pump, and the head and outlet pressure can be very high.

Multistage centrifugal pumps and single-stage centrifugal pumps are centrifugal pumps. The pump can be connected in series to improve the head, and the head is superimposed, such as using the impeller of the same specification and size, which is installed in the same pump in series, (the same shaft, the pump shell cavity is separated by a certain extent, and the liquid channel is not connected) has become a multistage pump, of course, the single-stage pump is relative to the multistage pump.

Compared with single-stage pumps, the difference between multistage centrifugal pumps is that multistage pumps have more than two impellers, which can suck and pressure water in multiple stages in stages, so as to lift water to a very high position, and the head can increase or decrease the number of stages of the pump impeller according to needs. Multistage pumps are mainly used for mine drainage, urban and factory water supply, and are rarely used for agricultural irrigation, and are only suitable for lifting water in high mountains with high head and small flow to solve the difficulty of drinking water for people and animals. There are two types of multistage high-core pumps: vertical and horizontal, and the pump shaft of the multistage centrifugal pump is equipped with two impellers in series, which can also achieve a higher head than the general single-stage centrifugal pump; Compared with reciprocating pumps such as piston pumps and diaphragm pumps, it can also pump a larger flow rate.

The multistage centrifugal pump has high efficiency and can meet the needs of high head and high flow conditions, and has been widely used in petrochemical, chemical, electric power, construction, fire protection and other industries.

Due to its own particularity, compared with single-stage centrifugal pumps, multistage centrifugal pumps have different and higher technical requirements in terms of design, use and maintenance. It is often people's negligence or poor consideration in some details, which makes the multistage centrifugal pump frequently occur abnormal wear, vibration, shaft holding and other failures after it is put into use, and also causes shutdown.

The centrifugal pumps produced by China Coal Group can convey hot water, oil, corrosive and abrasive media by changing the material of the pump, sealing form and adding a cooling system. The centrifugal pump is divided into two types: multistage centrifugal pump and single-stage centrifugal pump.

Multistage pumps and single-stage pumps are both centrifugal pumps, but single-stage pumps have only one impeller, while multistage pumps have multiple impellers.