If you decide to equip your own intake source(well) and at the same time they drilled it into the first aquifer (and these are, as a rule, wells into sand), then you will have to think carefully about choosing a pump. Since pumping water contaminated with sand is not within the power of every unit. Even the smallest grains of sand from the bottom of the source, accidentally falling into the pump, can disable it forever. And standard flushing of equipment will not help here.
What types of pumps will be best for a sand source and how to choose the right device, we understand below.
In order to understand the purpose for which a pump for a source of this type is so carefully selected, it is not superfluous, but even better, to know its device. So, the aquifer in this case is a sand deposit. And since the porosity of the sand is quite high, the mobility of the sand grains is also great. That is, when water moves in the reservoir and when it enters the well, as well as under the influence of a forced device (in our case, a deep pump), the sand will rise and fall into the pumped water. Thus, the supply of dirty water to the water supply system is not ruled out.
But this is not the biggest problem. Much worse is the fact that the motor of a pump pumping dirty water with sand simply cannot withstand such loads. long time, and burn. In this case, the deep unit is not subject to repair. Now weigh: are you ready to pay a tidy sum again for a new pump and at the same time know that the cause of the breakdown of an expensive device was negligence when choosing a pump?
Important: in order to provide additional water protection and pumping equipment from sand, when arranging the bottom hole, professionals form a natural filter from fine crushed stone and pebbles. This allows you to stop the washing and movement of sand in the well. Here at the end casing pipe install a strainer.
vibration pump
The use of this type of submersible equipment for sand wells is highly discouraged. Firstly, the device itself, according to its technical indicators, does not accept the processing of dirty water.
And, secondly, the oscillatory movements of the pump in the well will simply create ideal conditions for the movement of grains of sand in water. In addition, there is a risk of partial or complete sanding of the well, which will require its thorough flushing and pumping with the help of professionals.
Surface pump
Although this type of unit is suitable for working in shallow wells (up to 8-9 meters deep), it cannot process dirty water. Even the smallest percentage of inclusion of sand in water can disable the unit once and for all. Moreover, this sensitivity to various components in water is inherent in both a vortex and a centrifugal unit.
Important: surface pumps are the ideal solution for small suburban area and wells (wells) with a low flow rate.
Benefits of a centrifugal pump
The ideal solution for a sand well is a submersible centrifugal pump. Its ability to pump water with inclusions of sand, silt or clay allows you to be calm for the unit.
A distinctive feature of such a submersible unit is its ability to pump dirty water with sand and other small inclusions. So, for some centrifugal-type models, the following indicators are relevant:
- Submersible pump "Vodomet" from the manufacturer "Dzhileks" - 150 g / m3;
- Deep pump "Aquarius" from the same manufacturer - from 150 g / m3 and above.
Moreover, user reviews indicate that such models of pumps successfully pump dirty water with the inclusion of sand in it up to 1.5 kg / m3.
Important: and yet you should not experiment and let the equipment wear out. It is better to ensure reliable bottomhole filtration before installing the pump.
Advantages of screw pump
Another type of quality pumping equipment for pumping dirty water. Such a unit works on the principle of the Archimedes screw familiar to everyone (a similar screw is installed in all models of meat grinders).
It is known that the ability of a screw submersible pump to pump sand sometimes led to the fact that rather long “sausages” of clay and sand rose from the bottom of the well. And manufacturers of such equipment guarantee that the pump can pump water with a sand content of up to 2 kg / m3.
It is noteworthy that screw-type submersible pumps can be mounted both in shallow wells and at a fairly large depth (up to 300 meters). In this case, the performance of the unit will be constant.
And one more thing: if you doubt the correctness of your choice and do not know which unit is better to buy, then consult with professionals. Since before buying a pump (surface or submersible), in any case, you need to know such parameters as:
- Average daily volume of water consumed per family (house);
- Well depth;
- Source casing diameter;
- Well flow rate.
Only in this case you will be able to choose the most optimal pump model for your sand well.
In everyday life and production, it is often necessary to pump out water. This may be necessary, for example, to clean reservoirs, wells or wells.
But you don't always have to deal with clean water, without impurities, sand, silt and other deposits: when it becomes necessary to pump out water with various kinds of inclusions, sand pumps will help to cope with this task perfectly.
1 What is a sand pump?
The sand pump is a pumping equipment: these are single-stage, cantilever centrifugal pumps with an impeller (open) on one side. Its main task is to pump various kinds, including sandy, abrasive slurries, ore beneficiation products, as well as alumina production, water mixed with clay, silt, etc. However, there are certain restrictions on physical and chemical properties the fluid that needs to be pumped or cleaned.
Indicators that the pumped solution should have:
- The temperature can be from 5ºC and not exceed 60ºC.
- Density of pumped liquid up to 1300 kg/m³.
- The concentration of solids (inclusions) should not exceed 25%.
- The maximum size of these same inclusions can reach up to 10 mm, no more.
- The maximum microhardness is 9000 MPa.
It is better to pay attention to these indicators, since if they are observed, pumping equipment will work most efficiently and for a long time.
1.1 Applications
The main areas of application of this type of pumps are metallurgical, mining, construction and other industries, while this is not an exhaustive list of areas where it can be useful.
The silt and sand pump can perform the following tasks:
- for cleaning and subsequent filling of trenches (when laying cables, pipelines, etc.);
- removal of sludge, silt, settled dirt, clay, Wastewater, various types of household and industrial waste;
- for cleaning caissons during construction work;
- restoration of coastal zones;
- marble dust pumping;
- for cleaning various kinds of reservoirs;
- extraction of sand from the bottom of the ocean;
- the pump is also suitable for pumping sand from a well and a well;
- this drainage pump can be useful in the destruction of gold mining tailings, to improve the operation of the well in ball mills;
- on the treatment facilities, for the collection well of concentration plants, as well as in order to remove materials from settling tanks.
This pumping equipment is not intended for pumping, pumping water and other works for cleaning in fire and explosion hazardous conditions.
2 What types of sand pumps are there?
The protection of the flow path determines the division of pumps by type, and also demonstrates the maximum allowable size solids that the pump can pass:
- Gummed (PR) Particle size up to 2 mm.
- Corundated (PC) Particles with a diameter of 1 mm.
- Created from wear-resistant cast iron (types P and Pb). Pumps of this kind are capable of passing particles of clay, silt, sand and other substances up to 6 mm in size.
Depending on how the shaft is located, horizontal and vertical pumps are distinguished. Horizontal models include models of types PR, P, PB, as well as PK, while vertical models include PKVP and PRVP.
- Type P pumps are console horizontal single-stage pumps with an impeller for one-way inlet. These centrifugal samples are used for pumping and pumping products obtained as a result of ore dressing and alumina production. The material from which the solid part is made is wear-resistant cast iron. Solution density up to 1300 kg/m³. Permissible cavitation reserve-height below which the designer cannot fall is 2.0 m.
- The pump type PB is also horizontal and cantilever. But at the same time, centrifugal pumps of the PB type allow you to have a cavitation reserve of 5.0 m.
- PR differs from previous models in that the main part of the flow part is lined with corundum on an organic binder.
- Pumps of PKVP and PRVP types are also cantilever pumps, but at the same time they are vertical. They are submersible with supports outside the pumping of water or other liquid.
The strong part in PRVP consists of wear-resistant rubber, and in PKVP - corundum lining with an organic binder.
2.1 Surface and immersion models
Downhole (in particular, sand) drainage pump in its structure can be both surface and submersible.
In the first case, it is a powerful device with a rotor that pumps water or sludge by sucking it through the working chamber. Such pumps are capable of lifting slurry at a depth of up to 10 meters.
Advantages of surface pumping equipment:
- the ability to transport liquids over sufficiently long distances;
- the possibility of continuous long-term work;
- high degree of reliability, as there is no need for immersion in an aggressive water environment.
Flaws:
- high noise level;
- the impossibility of the pump to work deeper than 10 meters.
As for submersible models, this is equipment designed to pump water directly to a well or from a well. During operation, they are immersed under the very thickness of the water and left there until the completion of the process of pumping the well.
A device of this type is more productive than the previous type. Also, their advantage is the ability to work at more serious depths of a well or well (the exact characteristics depend on the specific manufacturer and model of pumping equipment).
Strengths of submersible pumps:
- small size and weight;
- long-term use without maintenance is possible;
- high performance;
- dry protection;
- it is possible to use in automatic mode for a drainage well;
Which type of pump to choose - surface or submersible - depends on the depth at which you are going to work (the process of cleaning, pumping, etc.), at what speed you need to carry out these works. The issue of price is also important, as immersed samples are more expensive.
2.2 How does a screw well pump work?
The screw borehole drainage pump is a type of submersible pump that specializes in pumping water from a well (hence the name), and is one of the most popular examples of sand pumps.
In these pumps, the working element is a broaching screw or an auger (hence the second name - auger). Systems of this type allow them to be used in wells with high level pollution. Screw design do not allow sand and other small debris to clog anywhere and block the operation of the pump.
And the fact that when the rotor accelerates, the productivity increases, but the outlet pressure remains practically unchanged, makes it possible to use screw pumps not only for pumping and purifying water from a well or well, but also in production, for example, when pumping oil products.
Screw models have a number of advantages, among them:
- Convenience of design. Such pumps are extremely easy to operate: no special knowledge is required.
- Ease of repair. Both mechanical seals and stuffing boxes are designed in such a way that if the need arises, they can be replaced in the shortest possible time without using any additional equipment.
- Absence of vibrations. Screw pumps create practically no vibrations, despite high power and a large number of working revolutions. This happens due to the use of rotors with the extraction of hollow parts.
- Long service life. This advantage "follows" from the previous one: it is precisely from the absence of vibrations that screw pumps are distinguished by a long service life.
2.3 How does a sand pump work? (video)
Individual water supply of a private house cannot be imagined without pumping equipment that delivers water to the consumer; for this, several modifications of electric pumps with different operating principles are used. One of popular types is a screw pump for a well, mainly used for water intake from sources whose water basins are located on sand.
Screw (screw) electric pumps, represented on the market by submersible models, are produced by many leading domestic and foreign manufacturers of pumping equipment, their cost does not go beyond the average price for this category of units. To choose the right electric pump, consider several classes with different principle action, while screw borehole pump under certain conditions, it has some advantages over other varieties.
Rice. 1 Popular models of screw pumps
Pumps installed for pumping water, depending on the location relative to the water source, are conditionally divided into two groups: surface and submersible.
The first ones are installed on the ground next to the well, a pipe or a pressure hose is lowered into the mine for water intake, while the maximum suction depth (location of the water mirror from the surface soil layer) does not exceed 9 m. technical characteristics with a maximum volume of pumped liquid of 5 m 3 / h and a head of about 50 m, the efficiency of devices is not more than 50%. Usually surface aggregates are included in the package of pumping stations, which are a single unit, in which, in addition to the electric pump, a hydraulic accumulator and a pressure gauge are installed.
Submersible pumps presented on the market in several varieties with different principles of operation, depending on the design, cost and quality of well water, they are used in the household for a variety of purposes.
Rice. 2 The principle of operation and design of a centrifugal electric pump Centrifugal
Centrifugal electric pumps occupy a leading position among other types due to next feature design resulting from their principle of operation - the inlet water flow enters the impeller axis and is displaced by its blades through the nozzle on the side of the casing. Thus, it became possible to connect any number of centrifugal wheels with chambers (stages) in series with an increase in pressure at each stage.
The pressure in household modifications reaches 200 m or more, the throughput is up to 20 m 3 / h, the efficiency increases with an increase in the dimensions of the pump unit and reaches 65% for household high-quality models of Danish and Italian production.
High-quality centrifugal electric pumps from world-famous European concerns are equipped with internal protection against overheating of the winding in the absence of coolant, have a built-in check valve, expensive models are equipped with an electronic shaft speed control unit depending on the volume of water consumption using pulse-width modulation. This solution makes it possible to reduce the dimensions of pumping equipment, practically eliminating them, as well as save electricity, reducing its consumption by 40%.
Consumers are in high demand for centrifugal pumps from the world's best manufacturers of pumping equipment: Grundfos (Denmark), Pedrollo, Speroni (Italy), Wilo (Germany), Russian brands Belamos, Aquarius, Unipump (manufactured in China). It should be noted that the difference in prices between the products of leading foreign companies and products of Russian or Chinese production is quite significant, a high-quality electric pump from Grundfos costs about 1000 USD, while a domestic or Chinese pump with similar characteristics can be purchased for 200 USD. e.
Rice. 3 Vibrating electric pump - device Vibrating
The manufacturing technology of vibration electric pumps has not undergone significant changes since Soviet times, so there are many Russian brands on the market, there are products of Ukrainian and Belarusian production, and Chinese models are present in sufficient quantities.
The difference between vibrating electric pumps from other types is the absence of rotating parts and, accordingly, bearings, the principle of operation is based on the reciprocating movement of the coil armature when AC is applied to its winding. A rod with a piston that draws in water is welded to the armature of the electromagnet; a check valve is installed near the inlets to prevent the outflow of liquid into the source.
Vibrating models have a rather low efficiency of about 35%, the maximum volume of the pumped liquid does not exceed 1.5 m 3 / h, the head is not more than 80 m.
These characteristics are considered not too high to provide water to a private house with even one person living, therefore, vibrating pumps are mainly used for household purposes: for irrigating garden beds, filling pools, ponds, different kind water tanks, drainage works.
Since vibrational species are not too sensitive to a high content of suspended particles in water, they are often used for pumping wells and wells, extracting turbid water with clay-sand fractions from them.
Vibrating pumps are classified as budget products price category, their minimum cost is about 20 USD, average price typical high-quality unit 30 c.u. On the market, vibropumps are represented by a large number of domestic (Brook, Malysh, Summer Resident, Aquarius, Whirlwind, Bison) and Chinese (Oasis, Patriot) brands.
Rice. 4 Peripheral pump - design Vortex
In vortex varieties, water is sucked in through the side opening of the hydraulic part of the housing by the blades of the impeller and then thrown out through the discharge pipe located next to the suction channel.
A feature of vortex pumps is the small distance between the impeller of the petal wheel and the walls of the working chamber, which is necessary to reduce hydraulic losses, so the units operate only in clean water. The highest pumping volume of household electric pumps of the vortex principle of operation does not exceed 5 m 3 / h, the pressure reaches 100 meters, the efficiency is not more than 50%.
In vortex models for domestic use the feed wheel is located at the top near the outlet, and the electric motor with a vertical shaft, on which the vortex wheel is mounted, is installed below.
Liquid suction occurs through a perforated filter located around the impeller - by its location in the upper part near the outlet pipe, it is easy to determine the vortex principle of operation of the electric pump.
On the market vortex pumps are less common than centrifugal models, domestic producers are represented by the brands Belamos, Whirlwind, Unipump, the Italian deep pump Pedrollo Davis is popular.
Rice. 5 Screw pump - internal organization and screw assembly Screw (screw)
Electric pumps that suck in and push water using the Archimedean screw method are called screw pumps, this is the second most popular group after centrifugal pumps. AT household appliances the screw is located in the upper part and is connected through an adapter to the motor shaft.
The advantage of screw electric pumps is the simplicity of design and the ability to work effectively with turbid and dirty water, as well as with viscous media, thanks to the latter feature, screw modifications are widely used in industry for pumping oils and refined products.
Screw electric pumps from world trade leaders (Grundfos, Wilo, DAB, Pedrollo, Speroni) are not found on sale, the units are presented by well-known Russian brands Belamos, Jemix, Whirlwind, Unipump Eco Vint, Aquarius, by the Sturm group of companies.
On sale you can find screw electric pumps and less popular brands of Russian and Chinese production: Host, Alba, Oasis, Patriot, Vodotok, as well as Sprut from the Ukrainian company Varna from Kharkov.
On a note: Distinctive feature vortex electric pumps of domestic production - perforated rectangular holes in the upper third of the body through which water is taken.
Rice. 6 The principle of operation of the screw pump
The principle of operation and design of the screw pump
In a standard auger household electric pump, the working screw is made in the form of a spiral pin made of corrosion-resistant material, which is chrome-plated steel, stainless steel or high-strength plastic. The fluid sucked in by the rotating screw enters the technical polymer cage and is then pushed out into the upper outlet pipe of the electric pump.
A screw electric pump used in everyday life consists of the following main components (Fig. 7):
1 — The electrical part with a vertically located single-phase electric motor with a dry rotor and an oil-filled chamber separating the engine compartment from the hydraulic part, a starting capacitor is located inside the lower part of the housing.
2 - The hydraulic part consists of a housing, a water intake filter and a working auger rotating in a holder made of an elastic polymer (rubber) - a screw and rubber coupling assembly pushes the liquid entering the housing through perforated holes 3 to the outlet pipe.
3 - The intake part is a stainless steel cylinder with holes made in the side walls for drawing in water.
4 - On the top cover of the pump, made of brass or stainless steel, there is an outlet pipe and lugs.
5 - The outlet pipe is performed with internal thread standard diameter 1 inch, a check valve and a lifting sleeve are attached to it.
6 - A nylon or metal cable in synthetic protective insulation is tied to the eyes.
Rice. 7 Structural arrangement of the screw pump
Distinctive features and parameters of screw electric pumps
Typical screw pump for wells used in individual water supply, has the following technical parameters:
- Power supply voltage: variable 220V ± 10%, with a frequency of 50 Hz.
- Temperature range of pumped liquid: from 0 to 35 °С.
- Pumped water pH: 6.5 - 8.5.
- Operating temperature range of the environment: from 0 to +40 °C.
- Minimum immersion depth under the water mirror: 0.5 m.
- Permissible volume of mechanical particles in the pumped water: - no more than 500 g/m 3 , the content of fibrous materials in the liquid is not allowed.
- Permissible diameter of mechanical fractions: - 1 mm.
- Maximum pressure: 3 m 3 / h, for most models it does not exceed the threshold of 1.5 m 3 / h.
- Limit head: up to 200 m, this indicator is a rare exception, most modifications create a head pressure of no more than 100 m.
Rice. 8 Key Features of Chinese Oasis The main advantages of screw electric pumps:
- Low cost, the price of the cheapest models is about 80 USD, in general, all models are cheaper than centrifugal types.
- Simplicity of design. The working part consists of a screw and a rubber cage, they are easy to maintain and, if necessary, simply replace, which makes the repair of auger units very simple.
- A screw pump for a well, due to its principle of operation, can transport liquid with large fractions of sand and clay deposits - this is its main advantage. A submersible screw pump is preferably used for water intake from well sources on sand, often with a high content of suspended particles of clay and sand. Although their details are subject to mechanical impact particulate matter, the life of the screw pump in turbid sources will be higher than that of centrifugal models.
The disadvantages of screw units include the mediocre quality of many products (chrome-plated screw, quickly abraded clip) and not too high technical characteristics, noticeably inferior to centrifugal types, as well as low efficiency, not exceeding 45%.
Application area
We can say that a screw pump for a well, due to the ability to pump out dirty water, is the leader in the number of areas in which it is used in household chores. A screw borehole pump is purchased for:
- arrangement of water supply for cottages and wells;
- filling artificial ponds, pools, tanks for heating and drip irrigation;
- irrigation of vegetable gardens, orchards and any areas with plants in the garden;
- drainage in case of flooding of basements, cellars and basements in the house;
- pumping wells after drilling, some professionally engaged firms specifically purchase screw pumps for this purpose;
- cleaning wells and wells from silt deposits.
Rice. 10 Parameters of screw pumps of the Unipump Eco Vint series Well installation rules
To immerse a screw electric pump into the well, either an adapter is used, to which a cable is tied and a water supply pipeline coming from the unit is attached. Usually, before diving, tie the pressure hose, power cable and retaining cable together with insulating tape or plastic ties, the following rules are observed during installation:
- Water-lifting pipes can be selected from low-pressure polyethylene (HDPE), steel or flexible elastic polymers, the main condition is the ability to withstand the maximum pressure in the system and an internal bore diameter not lower than the thread size inside the outlet pipe.
- When using a flexible hose, make sure that there are no kinks or twists.
- For lowering and lifting, use only a nylon or metal (stainless) cable, it is forbidden to hang the unit by an electric cable.
- Before diving, make sure that the inner diameter of the casing string is higher than the outer dimensions of the pump casing together with the electric cable, and that the pipes do not have bends or narrowed sections.
- It is not recommended to place the power cable in a coiled coil - this leads to its overheating and melting of the insulation.
- The minimum distance of the pump from the bottom of the well is 0.5 meters, the optimal distance is 1 m.
- It is forbidden to operate the pump on a closed tap - this will lead to its failure.
- Mandatory installation in the control system, even if there is an internal protective automation against overheating of the winding.
- When installing modifications that do not have a built-in check valve, it is installed on the outlet pipe in front of the water-lifting pipeline.
Rice. 10 Scheme of installation and connection of the screw unit
When comparing which borehole pump is better: centrifugal or screw, there is no definite answer, since the scope of these pumping units is slightly different. Screw electric pumps are usually used in situations where it is necessary to work with contaminated water, while due to their relatively low technical characteristics, the well should have a shallow depth or be located closer to an individual house. It is impossible to find European-made screw pumps on the domestic market, all goods are supplied in trading network domestic and Chinese firms, so user reviews regarding the quality and materials for the manufacture of screw units are controversial.
If you decide to make your own source of water for yourself and drilled a well, and the first layer of water is drilled, then you need to carefully consider the choice of pump. Not every unit can pump water that is contaminated with sand. It happens that the smallest particles of sand get into the pump, and this leads to its malfunction. Flushing equipment, which is done in such cases, will not help.
What type of pump is best suited for such a source and the right choice of pump
To understand what better pump will function for such a source, you need to know the characteristics and properties. In such a situation, sand deposits are an aquifer. Due to the fact that the sand has a high porosity, then, accordingly, the grains of sand move actively. It turns out that when water moves in the reservoir, enters the well and the deep pump operates, the sand rises and enters the already pumped water. Because of this, it is possible to supply dirty water from the water supply.
Such a process negatively affects the pump motor, pumping dirty water, puts heavy loads on it, which it cannot withstand for a long time, and subsequently burns out. After that, it cannot be repaired. If in doubt which pump is better to choose, then seek help from a specialist who can give useful advice and advise on this choice. You can buy a pump for a well in the online store: "World of Pumps" by clicking on the link nasos-od.com.ua
On a note! It is worth knowing that in order to ensure additional protection water and the pump itself from pollution, specialists who are engaged in drilling wells and their arrangement make a natural filter from small gravel and pebbles. This stops the movement of sand in the well itself. A strainer is also attached to the end of the casing pipe.
Vibrating pump
Such a pump is not recommended to be immersed in wells on sand. This device is not designed to process dirty water. The pump performs oscillatory movements during operation, and this only activates the movement of grains of sand. By installing such a pump, the well may become clogged with sand, then you will have to turn to the help of specialists to flush it.
Surface pump
Designed for shallow wells, no more than nine meters, not intended for processing dirty water. Even the slightest hit of grains of sand can lead to its breakage. Surface pumps often used for summer cottages, wells or wells with little depth.
Centrifugal pump
This type of pump is the ideal solution for a sand well. He is not afraid of sand or clay, he copes with such pollution easily, which does not harm his work, and therefore, his service life will be long.
Water enters the outlet due to the rotation of the blades. The centrifugal force that appeared inside the unit supplies water from the well to the pipe. Such a device pumps contaminated water. From user reviews, we can say that up to 1.5 kilograms of pollution is pumped per cubic meter of water. In any case, you need to install well filtration, it’s not worth the risk, since such equipment costs a lot of money.
screw pump
This is not afraid of strong pollution from sand and clay, it can pump up to two kilograms of sand per cubic meter of water. They are used both for shallow wells and for wells of great depth, it can be up to 300 meters. This does not affect the performance of this device.
Screw pumps are one of the ways to solve the problem of water supply, which is suitable for a private house, a small farm. These unpretentious devices become the only way out if there is a lot of sand in the well. Equipment of this type works even when the well is very sandy or silted, it lifts water with sand, as well as sand with water, without breaking or clogging. Therefore, for weak wells, Abyssinian wells screw pumps for water reliable option, which depends little on the state of the source.
One of the types of screw pump in the context
Advantage of screw pumps
The ability to pump water from large quantity inclusions is provided by the special structure of the internal part of the device.
To understand how a borehole screw pump works, it is enough to consider an ordinary kitchen meat grinder, where the main part - a screw or auger - rotates and promotes minced meat or other consistency. In the pump, it is placed in a rubber sheath, connected to the engine by means of a cardan shaft. Devices designed for pumping large volumes have rigid shells and are able to withstand significant pressure. 
When the shaft rotates, the screw moves, which follows the developed trajectory - the turns of the screw and the rubberized inner surface form cavities that constantly rise to the supply hose or pipe.
The liquid moves into the chamber, the pressure forces it to continue moving upwards, rarefaction areas continue to form in the inlet pipe, which ensures a uniform supply of water from the well.
The design eliminates the reverse movement of water, and also allows the mechanism to cope even with viscous inclusions (this expands the scope of the device - it is used for pumping various substances with varying degrees of viscosity)
If you carefully examine the sample (or, again, a meat grinder), you can see that there is no place for sand or other inclusions to get stuck or linger - they rise along with the liquid flow.
This design gives undeniable advantage before equipment for moving water of vortex and centrifugal types, since it is screw pumps for wells that prolong the life of a water source and ultimately save a significant amount.
According to the classification, screw pumps are self-priming devices with a multistage structure. The developed lines of compact models make viable even weak wells with a minimum diameter.
The choice of the optimal equipment is influenced by where it will be installed. For installation in a well, samples are suitable that are attached to the wall of the well shaft.
When installing in a well, it is easier - you need a sample with a strong cable. For suitable at home model designed for standard voltage.
Types of screw structures
Such devices are single-screw or multi-screw. For individual use, a single-screw design is usually used, this is enough to provide a house or a small household with water.
To in drinking water there was no sand, a coarse filter with a cell is installed on the inlet pipe, which traps particles with a large diameter
In the figure, the filter is already put on the pump
If necessary, the resulting water is filtered - subjected to fine purification.
Water analysis is carried out to determine the need for additional filtration.
Rules for the operation of the screw pump
In addition to stable performance, independent of water quality, the borehole screw pump allows self-installation.
The internal structure, in which there is literally nothing to break, together with high-quality materials, eliminates the worries of solving the problem for a long time - the screw version has been working for at least 10 years, without reminding of itself and without requiring much attention.
- The screw pump for the well is cooled during operation - this is done by the pumped liquid. Thanks to this, the screw moves smoothly, no additional seals are required. The engine is located below the inlets, this protects it, natural cooling occurs
- In addition, the design makes the operation of the device almost silent - it is not audible, even if the well is located within the house
- The well will keep working longer, as there is no vibration that affects the source
- Even in case of breakdowns and malfunctions, it is quite possible to replace parts on your own - the design is so simple that a person without special skills can do it
- A screw submersible pump can work not only in wells - there are no requirements for the position of the device: it is located horizontally and vertically. This allows you to freely use it when pumping water from rivers, reservoirs, other containers and sources.
Disadvantages of screw pumps
With versatility and incredible reliability, screw pumps have disadvantages - a very short list:
- A durable screw well pump is expensive - there are cheap options, but their cheapness is relative. This is due to the technological complexity of its production.
There are affordable models, but they are short-lived - for one or two seasons, so if you plan to install for a long time, it is better to consider the products of firms, Russian or foreign with a price of $ 200 and appropriate quality - An idle screw pump for a well is not able to work - it will fail
- The amount of liquid supplied cannot be adjusted.
Downhole installation
The installation of a screw pump in a well is standard, there are no special features. This is an elongated cylinder with a cable in the upper part, connected by a power cable, depending on the design of the cables, there may be several. A hose or pipe for supplying water of the appropriate length is attached to the outlet pipe.
When installing, the depth at which the submersible screw pump will be placed is calculated; after measurements, a mark is placed on the cable or cable.
Some pumps are equipped with float switches, so before installation, you should study the instructions, if it is provided, connect it.
It is important to securely fasten the cable, if the equipment breaks and falls into the well, it will be difficult and expensive to get it
indicator correct installation is quiet operation, without noise, vibration, knocking.
Brief overview of screw pump manufacturers
Almost all manufacturers have a range of electric pumps of this type.
- The products of the Ukrainian manufacturer "Aquarius" are popular. Narrow, suitable for wells with a small diameter (at least 10 cm), relatively inexpensive. Withstands use in harsh environments
- "Belamos" (Belarusian brand) - stainless steel models, often equipped with additional thermal protection of the engine. You can use a device with any power. There are options suitable for small casing diameters
- Unipump (Chinese manufacturer) is a cheap, reliable option for springs and wells where low performance equipment is recommended. Even if at the same time a well or a well gives water with a large amount of sand and impurities, this does not have any effect on the operation of the pump. This is a well-known company whose goal is to provide consumers with affordable workable equipment. Judging by customer reviews, in most cases the manufacturer succeeds
- Grundfos is an expensive brand under which quality equipment is supplied. There are models with a diameter of 75 mm or more, suitable for low-productivity wells and wells, they pump water up to 55 meters. Other screw pumps are presented, capable of operating in various wells with different capacities.
Conclusion
If the water in the well is of poor quality, with sand and silt, a submersible screw pump will solve the problem. It is able to lift water with sand without failing at the same time, and is also used to clean silted and clogged wells.
Buying not even the cheapest screw equipment will cost less than drilling a new well.
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