The self-priming pump is the most used device, which is used not only in everyday life, but also in industrial facilities. The concept of "self-priming" does not serve as a characteristic of this device, but is one of the indicators of the classification.
What is the difference between a self-priming pump and the rest
All of them are divided into two types: self-priming and normal suction. It happens that during the operation of the pump air enters the main part. Therefore, the equipment will not perform the function of pumping water, but will work in vain.
In order for it not to fail, it is necessary to monitor the constant presence of liquid in the working elements of the device, and also immediately remove the resulting air.
The self-priming pump has a special hole in its design that serves to fill water. To keep it in the working area of the device, special valves are provided. You can find models that are equipped with valves. Their advantage is independentpouring water into the system. An important element is the pump housing. It is designed in such a way that the liquid required for filling is always in the main part, even if it is disconnected from the supply pipeline. These models should be stored in a warm place, as freezing water in the case may cause it to break. You also need to ensure that large elements do not penetrate inside. For these purposes, coarse filters are installed. Refilling water must be done quickly so that it does not have time to disappear.
This feature only applies to surface pumps. As a rule, the larger the absorption line, the more friction occurs in the pipelines. That is why the designs of self-priming models are such that the lifting height is 8 meters. The design of such pumps provides a plunger that serves to remove air from the system during operation. It is located at the top of the case. Too much air can result in longer priming time. Therefore, before using it, it is necessary to carefully check the connection of pipelines.
As for the normally suction element, the water filling is done only at the first start, and is not required afterwards. It is only necessary to ensure that air does not enter the housing. If hit, the mechanism will not function.
Types of pumps
All devices are divided into dynamic and volumetric pumps. They do not differ from each other in any way, except for the design, as well as the wayspipeline connections. A self-priming water pump can be either one or the other type. The most popular are vortex and centrifugal devices used both in everyday life and in industrial areas.
Centrifugal pumps
Such equipment is designed for both surface and submersible work.
Self-priming centrifugal pump is widely used not only in plumbing systems, but also in air conditioning and heating. Depending on the application, the shaft can be positioned vertically or horizontally. As a rule, vertical models are used to dive into the well. Sewer systems use a self-priming pump for dirty water. The workflow is pretty simple. The fluid enters the rotating mechanism, which is a wheel with blades, and moves in the direction of rotation of the axis. In this case, kinetic energy appears, which contributes to an increase in pressure. A self-priming water pump may have many working blades. The more of them, the higher the pressure will be. Such high values may adversely affect water transport.
Disadvantages of centrifugal devices
One of the main disadvantages is the tendency to cavitation. During operation, steam is formed, which later condenses. As a result, water hammers occur, which have a bad effect on structural elements and pipelines. To avoid cavitation, a self-priming centrifugal pump must be used.in gentle mode. This is an important condition.
Vortex self-priming pump
These devices also have an impeller, the blades are located radially.
Thus, it is sucked into the inner channel to the periphery. In this case, the kinetic energy increases, and the pressure of the water also increases. There is a significant difference between a vortex and a centrifugal pump. Having the same dimensions and speed of rotation of the blades, a higher pressure is created in the vortex models. In addition, they are not afraid of air entering the system. In addition, the cost of this type of device is much lower than that of a centrifugal pump. Vortexes have low efficiency, therefore they are used only for clean water. A self-priming pump is used in everyday life to supply liquid from tanks, or to increase pressure in a pipeline.
Differences between a vortex and a centrifugal device
- Vortex has more compact dimensions than centrifugal.
- What is the price? The vortex type self-priming pump has a lower cost, which is an important factor when choosing. As a rule, its cost is from 8,000 to 15,000 rubles, depending on the manufacturer.
- If a self-priming dirty water pump is needed, centrifugal units are best.
- The head of the peripheral pump is seven times higher than that of centrifugal models.
- The centrifugal elements produce less noise, so they are most often used in everyday life.
When choosing, do notlook only at prices, as cheap devices cannot always provide good water supply. You should pay attention to the technical characteristics and purpose. If you choose the right element and follow the recommendations for its use, then it will last a long time.
Reviews
Many people who use centrifugal pumps are completely satisfied with such equipment.
It perfectly provides water supply from tanks. In addition, it perfectly provides pumping of dirty water from sewer systems. Among the shortcomings, it is worth noting the high noise from water hammer, which appears due to the occurrence of cavitation. This pump does not require much maintenance.
It delivers quality performance when used properly.
The people who use vortex pumps did not regret it either. Due to the high pressure created, it became possible to pump a large volume of water in a short time. In addition, their dimensions are much more compact than the previous model. In order to avoid problems in operation, it is necessary to pump air out of the system.
Conclusion
Self-priming models are far superior to normal suction pumps.
First of all, they differ in design. Devices of the first type have a special hole through which water is automatically poured into the system. Check valves also provide pumpingair. The filling of water into the system of a normally suction pump is carried out only at the first start. However, in case of air ingress, it is necessary to fill in the water yourself. Therefore, self-priming pumps are common equipment that is used not only in everyday life, but also in the industrial field.
