Overview of the main types of pumps and their applications

A pump is a hydraulic tool that offers the ability to suck in water, expel it, and propel it. It operates by harnessing the transfer of both kinetic and potential energy to the fluid being pumped. There exist various types of pumps, which are categorized based on their technical parameters. These different types of water pumps vary in terms of their efficiency, power, capability, lifting height, and the pressure generated by the outflow.

General classification

Currently, there exist more than 3,000 varieties of pumps, each with its own unique structure and purpose to cater to different industries and applications. These diverse pumps can be broadly categorized into two groups: dynamic and volumetric pumps. Volumetric pumps are designed to move substances by altering the volume of their chambers, which allows for the alignment of the inlet and outlet ports to facilitate fluid flow. This category can be further subdivided into three types: membrane pumps, rotary pumps, and piston pumps.

• Membrane pumps utilize a flexible membrane that moves back and forth to displace the substance.
• Rotary pumps employ rotating mechanisms to transfer the substance.
• Piston pumps operate via reciprocating pistons to move the substance.

On the other hand, dynamic pumps function by utilizing hydrodynamic forces to propel the fluid through the pump, with a continuous connection between the inlet and outlet ports. Examples of dynamic pumps include jet pumps and vane pumps. Vane pumps, in particular, can be further classified into centrifugal pumps, axial pumps, and vortex pumps.

In the subsequent sections, we will provide a more detailed discussion of each pump type and their respective classifications.

Rotary devices

A review of water pumps is examining rotary devices that distinguish themselves by the lack of a valve. In simpler terms, the rotary water pump operates by pushing water out. This function is achieved through a unique component known as the rotor. Here’s how it works: water enters the working chamber and as the rotor moves along the inner walls, it causes a change in the volume of the enclosed space, resulting in the water being expelled based on the principles of physics.

Benefits of rotary pumps:

• Excellent performance;
• Effortlessly prime water;
• Allow for water to be returned;
• Suitable for pumping substances with various viscosities and temperatures;
• Generate low noise;
• No vibration.

It should be emphasized that ensuring the purity of the pumped liquids is essential, as solid inclusions are not permissible. Furthermore, the intricate design of these pumps often results in costly repairs.

The versatility of rotary pumps makes them ideal for handling aggressive and viscous substances, making them highly sought after in various industries such as chemical, oil, food, and marine. In the realm of oil production, screw pumps, a type of rotary pump, are widely employed. Additionally, rotary pumps find application in the municipal sector, where they are utilized for maintaining pressure in heating systems. Moreover, these pumps boast the advantage of not requiring lubrication or cooling.

Piston models

The operation of the piston pump relies on using mechanical force to displace water. This type of water pump has been around for centuries and has evolved into a more advanced and intricate device in its present form. Modern piston pumps feature robust and ergonomic housing, a comprehensive array of components, and flexible connections to water sources. Consequently, these pumps have found widespread applications in both industrial settings and residential environments.

The pump is a metal cylindrical container that serves as a casing for moving fluids. It is physically manipulated by a plunger-type piston, similar to a hydraulic press. The device operates by using reciprocating motion. When the piston moves upward, it creates a decrease in air pressure within the chamber, allowing water to be drawn in. The water enters through an inlet port with a valve that opens at this point. During the return motion, the valve closes and the outlet port flap opens, allowing the piston to push the water out. A regular syringe operates on a similar principle.

One drawback of this type of work is the uneven distribution of the liquid. To address this issue, multiple pistons are employed, moving in a periodic manner to ensure a consistent flow.

Another option is the use of double-acting piston pumps. These pumps feature valves on both sides, allowing water to pass through the entire cylinder multiple times. As the piston moves, it displaces the water within the working space, pushing some of it out of the pump. This design helps reduce pulsations in the pipeline. However, the double-acting system has the drawback of being more complex, which can make it less reliable.

The primary benefit of piston pumps lies in their simplicity and durability, while their main drawback is their limited capacity. In general, it is possible to increase the efficiency of this pump type, but it is not practical, as other types of pumps are able to offer higher capacities at lower costs for water pumping purposes.

The scope of application for this pumping equipment is very broad. It enables the operation not only with water, but also with corrosive chemicals and even explosive mixtures. Due to their inability to handle large volumes of liquid, these devices are not suitable for large-scale projects. However, they are commonly used in the chemical industry. Additionally, they can be utilized to establish a self-sufficient water supply system for residential homes or for irrigation purposes. Another industry where these devices have demonstrated their effectiveness is the food industry. This is mainly because piston models are sensitive to the substances they handle.

Membrane devices

The diaphragm pump is an innovative piece of machinery used to transfer liquids and other substances. This state-of-the-art equipment is able to handle both liquid and gaseous media thanks to its unique diaphragm. The diaphragm moves back and forth, altering the volume of the working chamber in a predetermined cycle.

The device design encompasses the following components:

• diaphragm;
• working chamber;
• rod for linking the diaphragm to the drive shaft;
• crank and connecting rod mechanism;
• valves for safeguarding against substance backflow;
• inlet and outlet connections.

These pumps can be equipped with either one or two working chambers. Single-chamber devices are more commonly used, while dual-chamber ones are employed in situations where higher performance is required.

The process is performed in the following way: when the device starts, the diaphragm is bent by the rod, which increases the chamber’s volume and creates a vacuum effect within it. This effect enables the medium to be suctioned. Once the chamber is filled, the rod returns the diaphragm to its original position, causing a sharp decrease in volume and pushing the medium out through the outlet pipe. A special valve automatically closes the inlet to prevent any liquid or gas from flowing back during the return stroke.

Some models have two parallel valves. In these cases, the process is similar, but there are two working chambers. With each stroke, water exits one chamber and enters the other. Such pumps are considered to be more efficient.

Advantages of diaphragm pumps:

• They are capable of working with any type of medium.
• They have a compact size.
• They operate quietly.
• absence of vibrations;
• straightforward and dependable design;
• energy efficiency;
• upholding the high purity of the pumped substance;
• affordability;
• extended lifespan;
• no need for specialized or frequent maintenance, and no lubrication required;
• replacement of damaged parts can be done by an individual without formal training;
• highly adaptable.

With such a multitude of advantages, there are no noteworthy downsides.

The application of diaphragm pumps is extensive in various industries. In the field of medicine and pharmaceuticals, they are commonly employed. Additionally, these pumps are utilized in farms for milking machines. Furthermore, they play a crucial role in food production and are indispensable in the nuclear industry. Dosing pumps for the manufacturing of varnishes and paints often utilize diaphragm technology. Moreover, they find utility in the printing industry and other settings that involve working with toxic or hazardous substances. The exceptional leakage resistance of diaphragm pumps ensures safe handling of such substances.

Jet pumps

Jet models are the most basic and uncomplicated devices available. They were originally developed in the 1800s for the purpose of removing water or air from medical tubing, and were later utilized in mining operations. In the present day, their range of application has expanded even further.

The jet pump is a low-maintenance device with a simple design consisting of four components: a suction chamber, nozzle, diffuser, and mixing tank. Its operation relies on the transfer of kinetic energy, eliminating the need for mechanical force. Water is drawn into the vacuum chamber of the jet pump and then passes through a specialized tube that leads to a nozzle. As the diameter of the tube decreases, the velocity of the flow increases, allowing it to enter the diffuser and then the mixing chamber. In the mixing chamber, the water mixes with a functional liquid, resulting in a reduction in speed but maintenance of pressure.

There are three main types of jet pumps: ejector, injector, and elevator.

1. An ejector pump solely transfers substances and operates using water.
2. The principle of operation of the injector pump involves injecting a substance, typically used for pumping out vapor.
3. The elevator pump is utilized to lower the temperature of the carrier by mixing it with a functional liquid.

Jet pumps are commonly used with water, steam, or gas. They can also be used for mixing different substances or lifting liquids (aerolift function).

This type of pump is widely used in various industrial applications. They can be used independently or in combination with other pumps. The simplicity of the design makes them suitable for emergency situations with water shutdowns and firefighting. They are also popular in air conditioning and sewage systems. Many jet pump models are available with different nozzles.

• Reliability
• There is no need for continuous maintenance;
• The design is straightforward;
• It can be applied to a wide variety of uses.

On the downside, its efficiency is low, not exceeding 30%.

Centrifugal pumps

The main component of this particular device is a disk that contains fixed vanes. These vanes are positioned at an angle opposite to the direction of movement. The shaft, which is powered by an electric motor, holds the vanes in place. The design can incorporate either one or two wheels, with the vanes connecting them together in the latter scenario.

The functioning of a centrifugal pump is grounded on the idea that water is drawn into the operating chamber through the inlet. The fluid captured by the spinning paddles commences to flow in synchronization with them. The centrifugal force propels the water from the inner part of the impeller towards the walls of the chamber, prompting the development of higher pressure. Consequently, the water is expelled through the outlet dock. As the water is in constant motion, such pumps don’t cause any pulsation in the water supply.

Centrifugal pumps have a wide range of applications when it comes to domestic use. They are commonly utilized to extract water from wells or boreholes. This water can then be used to establish a water supply system for the house or for irrigation purposes. Additionally, centrifugal models can effectively circulate hot water in heating systems, as they eliminate pulsation and prevent air from entering the system. These pumps come in different variations that can also be used for pumping water out of basements or swimming pools, removing waste matter, and functioning as drainage machines.

It is important to note that basic centrifugal pumps are specifically designed for clean water without any solid particles. However, there are various subtypes that can handle working with contaminated fluids as well.

Axial models

This device operates without any centrifugal forces and relies solely on the transfer of kinetic energy to function. The blades in the bending chamber are positioned along an axis that aligns with the flow. As water passes through the chamber, the axis increases its speed and pressure. The design of this pump requires rigorous production standards. Typically, these pumps are utilized as ballast and control systems in ships, floating docks, and related equipment.

These pumps are primarily designed for the purpose of pumping fresh water and salt water. Their primary applications involve diverting, supplying, and purifying water. Axial flow pumps possess the advantage of being highly compact in size, allowing for convenient installation within water pipelines.

Vortex pumps

Vortex pumps are similar in structure to centrifugal pumps, but their water supply is arranged so that water enters the chamber tangentially to the periphery and then shifts towards the center of the impeller. It is then pushed to the periphery again under pressure and by the movement of the blades, before being ejected through the outlet. The key distinction is that the cycle of water suction and ejection occurs multiple times during one revolution of the impeller.

The primary distinction between vortex pumps and centrifugal pumps lies in their capability to significantly increase head with a small volume of water. While both types of pumps are intolerant to solid particles and cannot handle viscous liquids, vortex pumps excel in pumping gasoline, various liquids containing gas or air, and aggressive substances. It is worth noting that vortex pumps exhibit a low efficiency.

Despite this drawback, these pumps find utility across a wide range of applications. They offer a practical solution when dealing with small quantities of substances that require high levels of pressure. Furthermore, when compared to centrifugal models, vortex pumps prove to be quieter, smaller, and more affordable.

Classification by type of power supply

All water pumps are powered by either electricity or liquid fuel. In the case of liquid fuel, they are always equipped with an internal combustion engine. A mixture of gasoline and oil or diesel fuel is used as the liquid fuel.

Gasoline variants are more economical and operate with less noise. Diesel machines are powered by diesel. They may have a higher cost, but the fuel itself is less expensive. Additionally, they tend to generate more noise.

Liquid fuel pumps, also referred to as motor pumps, are particularly convenient and portable. They can be utilized in any location, even in the absence of electricity.

Electric pumps utilize AC power to function. Owners of these pumps do not have to worry about fuel availability, but they must ensure a constant supply of electricity, which can be inconvenient at times.

Classification by liquid quality

Different types of pumps have different requirements for water purity. There are three main categories:

1. Pumps designed for pure water. These models, such as surface pumps, well pumps, and borehole pumps, can handle water with a solid particle content of up to 150 grams per cubic meter.
2. Pumps suitable for moderately polluted water. These include drainage pumps, circulating pumps, self-priming pumps, and certain fountain models. They can handle water with insoluble inclusions ranging from 150 to 200 grams per cubic meter.
3. Pumps specifically designed for dirty water. These are primarily drainage pumps and surface sewer models, capable of handling water with solid particle content exceeding 200 grams per cubic meter.

Classification by location

All pumps can be classified into two categories: submersible and external pumps (often referred to as surface pumps). Submersible pumps are either fully or partially submerged in the water. Semi-submersible pumps are those that are not fully underwater.

It is important to note that within the category of submersible pumps, there are different types available.

1. Vibrating pumps operate using an electromagnetic field and a vibrating mechanism. These pumps require specific installation rules, including defined distances from the bottom.
2. Centrifugal pumps, which were mentioned earlier.

All submersible pumps can have a built-in motor, either underwater or on the surface, depending on the model.

The external pump is situated in close proximity to the body of water. In this scenario, the suction mechanism performs its function through a designated hose. The further the pump is positioned from the water source, the greater its power requirement becomes.

Surface pumps are commonly utilized in country houses and rural areas. They possess a compact size and high efficacy, making them well-suited for domestic use. It is possible to equip them with automated features, allowing for complete autonomy.

Tip! By employing a remote ejector, it is feasible to extract water from significant depths.

Submersible pumps

There are various types of submersible pumps that are categorized based on their purpose:

• Borehole pumps;
• Well pumps;
• Drainage pumps;
• Fecal pumps.

Boreholes are elongated in shape and serve the purpose of extracting water. Their compact size enables them to be inserted into narrow boreholes, while also allowing them to be extracted from great depths. The boreholes demonstrate considerable power in their operation. They are specifically designed for water that is either minimally contaminated or completely uncontaminated.

Wells serve the purpose of extracting water from both mines and natural wells. What sets them apart from regular wells is their larger size and shallower depth. These systems have a significant amount of power and can effectively handle water that carries silt, sand, or clay particles. Additionally, they operate quietly and without any noticeable vibration.

Drainers are primarily responsible for extracting polluted water from basements, trenches, pits, and other locations. Some models are equipped with cutting blades to break down debris, while others are designed for handling mildly contaminated substances.

A fecal pump is similar to a drainage pump, except it is specifically designed for handling heavily contaminated water containing large solids (approximately 35 mm in diameter). These pumps are equipped with knives to shred any debris. They can be either submersible or external.

Surface pumps

There are several types of surface pumps, and their main difference is their proximity to the water source. These can be classified into different categories:

• Self-priming pumps;
• Automatic pumps;
• Pumping stations.

Self-priming pumps come in two variations: ejectorless and ejector pumps. In the first scenario, water is drawn in by the pump itself, while in the second scenario, a vacuum is created in the chamber to draw in the water. These types of pumps are commonly used for various purposes including irrigation, supplying drinking water, meeting household needs, and extracting water from surface bodies such as rivers and ponds. However, it is important that the water being pumped is either clean or has minimal contamination.

Automation is integrated into automatic pumps, streamlining their usage. No monitoring is required when using these pumps. Electrically powered, pumps with automation can have the automatic system installed directly into the model or as a separate entity. The primary objective is to optimize usage while providing a protective function. For instance, the device will cease operation if there is a sudden decrease in the water body’s depth, an elevation in the temperature of the substance being pumped, or voltage fluctuations within the network.

The pumping station includes the pump, a check valve, a control system, and an accumulator. This device features a rubber bulb housed in a metal casing. The bulb is filled with water while air is pumped around it. An integrated sensor detects variations in atmospheric pressure as the bulb fills with water. Once the pressure reaches its peak, the sensor halts the water supply.

With its simplicity and functionality, this unit offers great convenience. It’s especially helpful during power outages, and it also has the capability to provide water to multiple points simultaneously.