What is a horizontal multistage centrifugal pump? What is a single-stage centrifugal pump? What is the difference between multistage centrifugal pump and single-stage centrifugal pump? It is what everyone wants to master for centrifugal pumps such as centrifugal pumps. What is different from metrological verification of pneumatic diaphragm pumps?
The single-stage centrifugal pump is a kind of liquid and liquid, or a mixture of floating particles and vapor or liquid chemicals. It enters from the inlet at the root of the leaf drive shaft, obtains a centripetal force with the help of the rotating leaf, and then causes high pressure, which is discharged from the pressure relief inlet and outlet.
Multistage centrifugal pump combines two pumps with the same function. In terms of the structure of liquid safety channel, its main performance is that the material pressure relief port of the previous stage and the channel of the next stage can be safe channels with each other. In that way, the inlet of the same series layer by layer, the pressure relief port and channel are all connected in series, A multistage centrifugal pump is produced. The effect of setting multi-stage centrifugal pump is to increase the set working pressure.
The single-stage centrifugal pump includes pump casing, pump cover, motor equipment with output shaft, pump shaft, bearing with seat, centrifugal impeller, mechanical seal and mechanical seal screw cover structural components installed on the pump body. The key feature is that there is a device called wafer coupling between the output shaft with motor and the pump shaft, or it is a device installed on the bearing with seat, The guide roller bearing called the auxiliary support pump shaft.
The clamp type coupling has the effect of connection with the stiffness of the motor output shaft and the pump shaft. In the case of the motor output shaft and the pump, there is a length of indoor space in the middle of the shaft which is very convenient for disassembly and assembly of mechanical seal and mechanical seal screw cover. It is not necessary to remove the motor and pump cover during maintenance or removal and replacement of the machine seal.
What is the difference between multistage centrifugal pump and single-stage centrifugal pump? Experts told you that the difference between multi-stage centrifugal pump and single-stage centrifugal pump depends on the total number of centrifugal impellers. The characteristic of multistage centrifugal pump is that the pressure is too large and the total flow is small. Single stage centrifugal pump has only one stage centrifugal impeller, which is characterized by low working pressure and large total flow.
1、 Unipolar pump refers to the pump with only one centrifugal impeller, and the larger pump head is only 125 meters.
Second, the multi-stage centrifugal pump has two or more centrifugal impellers, and the larger pump head can exceed the pump head of the single-stage centrifugal pump; In the case of single pole pump head, multi-stage centrifugal pump must be combined with two-stage motor, which can be applied to four-stage motor according to the number of centrifugal impellers, so as to improve the service life of pump and reduce the noise of generator set. However, the maintenance of multi-stage centrifugal pump is a little difficult compared with single pole pump.
Third, when the specific pump head required by the pump is no more than 125 meters, the multistage centrifugal pump is generally more expensive according to the total area of the pump's personal studio and the pump price. It is also necessary to consider all aspects comprehensively. The monopole pump or multistage centrifugal pump should be selected.
Fourth, because there is only one centrifugal impeller on the pump shaft of the single-stage centrifugal pump, and there are many centrifugal impellers connected in series on the pump shaft of the multi-stage centrifugal pump, the multi-stage centrifugal pump is composed of the centrifugal impellers above the second stage installed on the same shaft to rotate together. During the work, the output of the front centrifugal impeller is input to the rear centrifugal impeller, and each layer of centrifugal impeller leaves is installed, Is called level one.
The pump installed above 2 is called multi-stage centrifugal pump, so the single pole centrifugal pump is only equipped with a centrifugal impeller. In the installation method, this is quite different from the measurement verification of pneumatic diaphragm pump.
Multistage centrifugal pump is mainly composed of motor stator, motor rotor, rolling bearing and water pump seal:
1. Part of the motor stator of multistage centrifugal pump is mainly composed of suction section, middle section, discharge section and guide vane. Each section is clamped by tightening anchor bolts to form a personal working room. D-type pump generally sucks in horizontally and spits out vertically; When filling water in oil and gas fields, the pump import and export trade is vertical upward. The outlet and channel of DG multistage centrifugal pump are vertical upward.
2. The motor rotor of multistage centrifugal pump is mainly composed of shaft, centrifugal impeller, equalizing plate and coupling. The axial force is balanced by the equalizing plate.
3. The rolling bearing of multistage centrifugal pump is mainly composed of rolling bearing body, rolling bearing and rolling bearing cap. The rolling bearing is lubricated with vegetable grease or thin oil.