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Different classifications of centrifugal pumps

Views:0     Author:Site Editor     Publish Time: 2020-07-06      Origin:Site

Different classifications of centrifugal pumps

There are many types of pumps used at the construction site, and centrifugal pumps are relatively common.

 

This article contains the following:


  • What is centrifugal pump

  • Different kinds of centrifugal pump

  • The difference between centrifugal pump and self-priming pump

 

What is centrifugal pump


A centrifugal pump refers to a pump that conveys liquid by the centrifugal force generated when the impeller rotates.

 

Different kinds of centrifugal pump


1. Classification according to the number of impellers

1. Single-stage pump: There is only one impeller on the pump shaft.

2. Multi-stage pump: there are two or more impellers on the pump shaft. At this time, the total head of the pump is the sum of the heads generated by n impellers.

2. Classification by working pressure

1. Low-pressure pump: the pressure is less than 100 meters of water column;

2. Medium-pressure pump: the pressure is between 100 and 650 meters of water column;

3. High-pressure pump: The pressure is higher than 650 meters of water column.

3. Classification by impeller suction method

1. Single-side water inlet pump: also called single suction pump, that is, there is only one water inlet on the impeller;

2. Double-side water inlet pump: also called double suction pump, that is, there is a water inlet on both sides of the impeller. Its flow rate is double that of a single-suction pump, and it can be roughly regarded as two single-suction pump impellers placed back to back together.

4. Classification according to the combination of pump casing

1. Horizontal mid-open pump: that is, there is a joint seam on the horizontal plane passing through the axis line.

2. Vertical joint surface pump: the joint surface is perpendicular to the axis.

5. Classification according to the position of the pump shaft

1. Horizontal pump: The pump shaft is in a horizontal position.

2. Vertical pump: The pump shaft is in a vertical position.

6. Classification according to the way of impeller out

1. Spiral casing pump: After the water comes out of the impeller, it directly enters the spiral casing.

2. Guide vane pump: After the water comes out of the impeller, it enters the guide vane outside it, and then enters the next stage or flows into the outlet pipe.

7. Classification by installation height

1. Self-irrigation centrifugal pump: The pump shaft is lower than the surface of the suction tank. It does not need irrigation when starting, and can be automatically started.

2. Suction centrifugal pump (non-self-filling centrifugal pump): the pump shaft is higher than the suction pool surface. Before starting, it is necessary to fill the pump casing and suction pipe with water, and then drive the motor to make the impeller rotate at high speed. The water is thrown out of the impeller by centrifugal force, and the center of the impeller forms negative pressure. Being impelled by the high-speed rotating impeller, the impeller is thrown out and enters the pressurized water pipeline.

In addition, it can also be classified according to the application, such as oil pump, water pump, condensate pump, ash discharge pump, circulating water pump, etc.

 

The difference between centrifugal pump and self-priming pump


1. The composition is different

The centrifugal pump is composed of six parts, namely the impeller, the pump body, the pump shaft, the bearing, the seal ring, and the stuffing box. The self-priming pump is composed of a suction chamber, a liquid storage chamber, a scroll chamber, a liquid return hole, and a gas-liquid separation chamber.

2. Different startup methods

When the centrifugal pump starts, it is necessary to fill the water inlet pipe and the pump body with water at the same time, or use an auxiliary device to pump the water inlet pipe. When the self-priming pump is started, a certain amount of starting circulating water must be injected into the pump body.

3. Different devices

The centrifugal pump must be equipped with a bottom valve at the lower end of the water inlet pipe or with a suction device at the outlet. The self-priming pump only has a filter screen at the lower end of the inlet pipe and no bottom valve.

If you want to buy centrifugal pumps,please contact SUOTO PUMP.


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