The difference between centrifugal pump and self priming pump, centrifugal pump or self priming pump

1. The structural composition is different

The centrifugal pump is composed of six parts, namely the impeller, the pump body, the pump shaft, the bearing, the sealing ring, and the stuffing box.

The self-priming pump is also a kind of centrifugal pump, which is composed of a suction chamber, a liquid storage chamber, a scroll chamber, a liquid return hole, and a gas-liquid separation chamber.

On the surface, the self-priming pump body is a square box; The inlet tube of the horizontal self-priming pump is higher than the center of the impeller of the pump, while the center of the inlet tube of the horizontal centrifugal pump is in a straight line with the center of the impeller.

2. The start-up method is different

Centrifugal pumps need to be filled and exhausted. Ordinary centrifugal pumps need a certain pressure head at the inlet when they are starting or running, that is to say, the inlet fluid must enter the pump chamber by external pressure, and it must meet the flow rate required by the inlet.

The self-priming centrifugal pump does not use a filling pump, but it needs to self-prime and exhaust first, and then open the valve. Usually, the pump chamber is manually filled with fluid during start-up, and the medium is introduced into the pump chamber by the siphon principle after start-up. The centrifugal pump has this unique venting ability, so this self-priming pump can convey liquids containing gases without the need to install a foot valve, and has a good cabin sweeping function when used on cruise ships.

3. The configuration is different

Centrifugal pumps are fitted with a foot valve with a strainer at the bottom of the suction pipe or with an air extraction device at the outlet. The foot valve is a reverse valve to prevent the liquid from leaking from the pump before starting. The strainer prevents solids from entering the pump.

The press-out pipe near the outlet of the pump is equipped with a control valve for regulating the flow rate.

The self-priming pump is only equipped with a filter screen at the lower end of the inlet pipe and has no bottom valve.

Centrifugal pumps and self-priming pumps are two different types of water pumps, and their main differences are as follows:

Working principle: The centrifugal pump generates centrifugal force by rotating the impeller, sucks the liquid from the suction inlet and pushes the liquid to the outlet through centrifugal force to achieve the purpose of transporting liquid. The self-priming pump pumps the liquid into the pump through the self-priming effect under the action of centrifugal force, so as to realize the function of automatic sucking and discharging of liquid.

Starting method: Centrifugal pumps usually need to be filled with liquid before starting, and centrifugal force is generated by an external starting method (such as motor starting). Self-priming pumps, on the other hand, can be activated automatically when there is no liquid or when the liquid level is low, eliminating the need for manual filling or external starting.

Self-priming ability: The self-priming pump has good self-priming ability, which can automatically suck in the liquid when the liquid level is low, and maintain the self-priming state when the liquid level rises. Centrifugal pumps, on the other hand, are often unable to automatically suck in liquids when the liquid level is low or when there is no liquid, and need to be filled with liquid by external start-up or manually.

Application scenario: Centrifugal pumps are widely used in industry, construction, farmland irrigation, urban water supply and other fields, and are suitable for transporting liquids with large flow and high head. Self-priming pumps are usually used in occasions where the liquid level changes greatly and requires automatic liquid inhalation, such as water pumping, automatic irrigation, sewage treatment, etc.

Structural features: Self-priming pumps are usually equipped with self-priming devices in the pump body, such as gyration chambers or self-priming pipelines, etc., to achieve the function of automatic liquid inhalation. Centrifugal pumps usually have a simple structure, including parts such as pump body, impeller, shaft and seal.

It should be noted that although the self-priming pump has self-priming ability, its performance and applicable conditions are also limited, such as self-priming height, self-priming time, liquid properties, etc. When selecting a pump type and application, a reasonable choice should be made according to the specific work requirements and conditions, and the manufacturer's operation and maintenance requirements should be followed to ensure the normal operation and long life of the pump.

1.The mechanical structure of the self-priming pump and the centrifugal pump is different, and the mechanism of the self-priming pump is mainly composed of the air help system, the air chamber, the stroke limiting device, the mechanical seal, the main body and the liquid level device. The centrifugal pump is mainly composed of a motor, a pump casing, a shaft, an impeller, a seal, etc., and its working principle is to use the impeller to convert the kinetic energy of the motor rotation into the pressure energy of the fluid.

2.The characteristics of the fluid handled by the self-priming pump and the centrifugal pump are also very different, the self-priming pump itself has no centrifugal effect, especially suitable for dealing with various fluids that constitute the cavity, usually the liquid that needs to be absorbed does not need to contain particles, and the pressure of the liquid that needs to be absorbed is low; The centrifugal pump has a good centrifugal effect, which has a more centrifugal effect when dealing with liquids containing particles, and can also convey liquids with higher pressure.

3.The scope of application of self-priming pump and centrifugal pump is also very different, the volume of the applicable fluid of the self-priming pump can be greater than the volume of its air chamber, and the water can be automatically sucked up from a low place, so the self-priming pump is mainly suitable for sucking water up from a low water level, usually used for irrigation, farmland irrigation, sewage treatment, etc.; The centrifugal pump is mainly suitable for pumping water from the water source, and is usually used for water tower water supply, high-rise building water supply, fire fighting and industrial production.

4.Different pumps also have different service life, the self-priming pump adopts a spring-type mechanical seal, which has high sealing performance, and is not easy to leak during operation, but for the liquid carried by particles, it is easy to be damaged by wear and tear during use, and the service life is relatively short; Centrifugal pumps, on the other hand, have a sliding seal that can handle liquids containing particles and have a long service life.

The main reason is that the inlet pipeline of the self-priming pump does not need to install the bottom valve to suck the water up after the first filling of the water intake, and there is no need to add water diversion in the future, the pump body is larger than the centrifugal pump, many of them have the function of water storage, and have the function of self-priming for life with a water diversion, and the centrifugal pump is to play the role of pressurization, the liquid level must be higher than the pump, and it must be able to flow into the pump body to start, if the liquid level is lower than the centrifugal pump, the bottom valve can only be installed at the suction inlet of the inlet pipeline to fill the pump and the pipeline with liquid in order to achieve the function of self-priming. Or install a diversion cylinder at the inlet, such as the centrifugal pump that does not work for a long time, the water in the inlet pipeline and the pump body is basically gone when the second start, and the water has to be filled again, and the operation is more troublesome, because the sealing of the inlet bottom valve of the centrifugal pump that has not been used for a long time can not achieve the effect of complete sealing, and the liquid will slowly leak back to the pool, so in the working condition that the self-priming function is required, the self-priming pump has a better effect than the centrifugal pump.

The self-priming centrifugal pumps all adopt the pump body structure of axial liquid return. The centrifugal pump body is composed of suction chamber, liquid storage chamber, scroll chamber, liquid return hole, gas-liquid separation chamber, etc., after the centrifugal pump is started normally, the impeller will inhale the liquid stored in the suction chamber and the air in the suction pipe together, and be completely mixed in the impeller, under the action of centrifugal force, the liquid entrainment of this gas flows to the outer edge of the scroll, and forms a white foam belt of a certain thickness and a high-speed rotating liquid ring on the outer edge of the impeller. The gas-liquid mixture enters the gas separation chamber through a diffusion tube.

At this point, due to the sudden drop in flow rate, the lighter gas is separated from the mixture, and the gas continues to rise and be discharged through the pump discharge port. The degassed liquid returns to the reservoir chamber and enters the impeller again through the reflux hole, mixes with the gas inhaled from the suction pipe inside the impeller again, and flows to the outer ......edge of the impeller under the action of the high-speed rotating impeller. As the process continues over and over again, the air in the suction pipe decreases until the air is exhausted, the self-priming pump completes the self-priming process and the centrifugal pump is put into normal operation.

Because of this unique venting capacity, this self-priming pump can convey liquids containing gases without the need for a foot valve, and has a good cabin sweeping function when used on cruise ships.

Summary. Hello, it must be the centrifugal pump flow rate <>

To give you a science popularization centrifugal pump needs to be filled with water every time it is started, and the self-priming pump does not need to be irrigated again because it can store a part of water. Centrifugal pumps are available in various forms, such as vertical, horizontal, single-stage, multi-stage, single-suction, double-suction, and self-priming. The centrifugal pump drives the water to rotate through the high-speed rotating impeller blades and throws the water out, so as to achieve the purpose of pumping water.

Relying on the high-speed rotation of the impeller, the liquid in the center of the impeller is forced to be thrown away at a high speed, resulting in a low pressure in the center of the impeller, so that the liquid in the low groove is continuously sucked up. If the centrifugal pump is filled with gas in the casing before starting, the central gas of the impeller after starting can not form a large enough vacuum in that place when it is thrown, so that the liquid in the tank can not be sucked up, so the space in the pump casing should be filled with external liquid before the centrifugal pump starts, and in order to prevent the liquid poured into the pump casing from flowing into the low-level groove due to gravity, a check valve (bottom valve) is installed at the inlet of the pump suction pipeline; If the pump is positioned below the tank level, there is no need to refill the pump at start-up.

The self-priming pump is a self-priming centrifugal pump, which is a kind of centrifugal pump.

Which has the highest flow rate, centrifugal pump or self-priming pump.

Hello, I am a pleasure to serve you, I am a senior answerer, a total of 3,000 people, can help you answer your questions. It will take time to type here, so please wait a moment <>

Hello, it must be the centrifugal pump flow rate <>

To give you a science popularization centrifugal pump needs to be filled with water every time it is started, and the self-priming pump does not need to be irrigated again because it can store a part of water. Centrifugal pumps are available in various forms, such as vertical, horizontal, single-stage, multi-stage, single-suction, double-suction, and self-priming. The centrifugal pump drives the water to rotate through the high-speed rotating impeller blades and throws the water out, so as to achieve the purpose of pumping water.

Relying on the high-speed rotation of the impeller, the liquid in the center of the impeller is forced to be thrown away at a high speed, resulting in a low pressure in the center of the impeller, so that the liquid in the low groove is continuously sucked up. If the centrifugal pump is filled with gas in the casing before starting, the central gas of the impeller after starting can not form a large enough vacuum in that place when it is thrown, so that the liquid in the tank can not be sucked up, so the space in the pump casing should be filled with external liquid before the centrifugal pump starts, and in order to prevent the liquid poured into the pump casing from flowing into the low-level groove due to gravity, a check valve (bottom valve) is installed at the inlet of the pump suction pipeline; If the pump is positioned below the tank level, there is no need to refill the pump at start-up. The self-priming pump is a self-priming centrifugal pump, which is a kind of centrifugal pump.

Centrifugal self-priming pump is a kind of centrifugal pump, but it has one more self-priming function <>

Centrifugal self-priming pump is a kind of centrifugal pump, but it has one more self-priming function <>

I hope mine is helpful to you, if you still have questions, you can ask me, if you are satisfied with my service, please give a comment, I wish you a happy life, happy <>

Centrifugal pumps and self-priming pumps are two different types of water pumps that work slightly differently and have different characteristics. Specifically, their differences are as follows:

The working principle is different: the centrifugal pump pumps the liquid out of the inlet through centrifugal force, and generates high pressure in the pump body to transport the liquid; The self-priming pump pumps the liquid into the pump body through negative pressure, without the need for an additional water diversion system.

The suction lift limit is different: the suction stroke of a centrifugal pump is limited and generally cannot exceed its rated suction stroke, while the suction lift of a self-priming pump is usually smaller, but can be increased as needed.

Applicable media are different: centrifugal pumps are suitable for conveying clean water and low-viscosity liquids, while self-priming pumps are suitable for conveying media containing gases and suspended substances, such as sewage, sludge, oil liquids, etc.

The operating efficiency is different: the efficiency of centrifugal pumps is higher, usually reaching more than 70%; The efficiency of self-priming pumps is lower, generally between 30% and 50%.

In general, centrifugal pumps and self-priming pumps have certain differences in use scenarios and application ranges, and each has its own advantages and disadvantages. Centrifugal pump Shendi has high efficiency and stable performance in conveying clean water and low-viscosity liquids; The self-priming pump is suitable for conveying media containing gases and suspended substances, and has a certain self-priming capacity. Therefore, the choice of the right pump needs to be decided according to the actual needs and the characteristics of the medium.

OK. As long as the centrifugal pump is installed on the inlet pipeline, the self-priming function can be achieved, in fact, the difference between the self-priming pump and the centrifugal pump is that the self-priming pump body has a large water storage function, while the centrifugal pump does not.

Centrifugal pumps can generally be divided into ordinary centrifugal pumps and self-priming centrifugal pumps. The ordinary centrifugal pump is a centrifugal water pump without self-priming function, the function of the centrifugal pump bottom valve is to manually divert water, install the ordinary tap water into the pipeline, so that the water has been stored in the pipeline, and the bottom valve can prevent the water from flowing into the pool. As long as the pipeline is filled with water, start the centrifugal pump at this time, block the outlet of the centrifugal pump, and slowly loosen the valve of the outlet after the value on the pressure gauge reaches the specified head, so that the required pressure can be achieved.

The function of the foot valve here is to store water, and when the impeller is running at high speed, it can also suck water up from the bottom of the pool, so that ordinary pipeline centrifugal pumps can be used as self-priming pumps.

In addition to the self-priming pump, there are many other classifications of centrifugal pumps, and these capabilities can also be self-priming.

Centrifugal pumps are a kind of driving type classification, while self-priming pumps are a functional classification of centrifugal pumps, and the two cannot be directly compared.